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1/*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16#ifndef _EXT4_H
17#define _EXT4_H
18
19#include <linux/types.h>
20#include <linux/blkdev.h>
21#include <linux/magic.h>
22#include <linux/jbd2.h>
23#include <linux/quota.h>
24#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
28#include <linux/timer.h>
29#include <linux/version.h>
30#include <linux/wait.h>
31#include <linux/blockgroup_lock.h>
32#include <linux/percpu_counter.h>
33#include <linux/ratelimit.h>
34#include <crypto/hash.h>
35#include <linux/fscrypto.h>
36#include <linux/falloc.h>
37#include <linux/percpu-rwsem.h>
38#ifdef __KERNEL__
39#include <linux/compat.h>
40#endif
41
42/*
43 * The fourth extended filesystem constants/structures
44 */
45
46/*
47 * with AGGRESSIVE_CHECK allocator runs consistency checks over
48 * structures. these checks slow things down a lot
49 */
50#define AGGRESSIVE_CHECK__
51
52/*
53 * with DOUBLE_CHECK defined mballoc creates persistent in-core
54 * bitmaps, maintains and uses them to check for double allocations
55 */
56#define DOUBLE_CHECK__
57
58/*
59 * Define EXT4FS_DEBUG to produce debug messages
60 */
61#undef EXT4FS_DEBUG
62
63/*
64 * Debug code
65 */
66#ifdef EXT4FS_DEBUG
67#define ext4_debug(f, a...) \
68 do { \
69 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
70 __FILE__, __LINE__, __func__); \
71 printk(KERN_DEBUG f, ## a); \
72 } while (0)
73#else
74#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
75#endif
76
77/*
78 * Turn on EXT_DEBUG to get lots of info about extents operations.
79 */
80#define EXT_DEBUG__
81#ifdef EXT_DEBUG
82#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
83#else
84#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
85#endif
86
87/* data type for block offset of block group */
88typedef int ext4_grpblk_t;
89
90/* data type for filesystem-wide blocks number */
91typedef unsigned long long ext4_fsblk_t;
92
93/* data type for file logical block number */
94typedef __u32 ext4_lblk_t;
95
96/* data type for block group number */
97typedef unsigned int ext4_group_t;
98
99enum SHIFT_DIRECTION {
100 SHIFT_LEFT = 0,
101 SHIFT_RIGHT,
102};
103
104/*
105 * Flags used in mballoc's allocation_context flags field.
106 *
107 * Also used to show what's going on for debugging purposes when the
108 * flag field is exported via the traceport interface
109 */
110
111/* prefer goal again. length */
112#define EXT4_MB_HINT_MERGE 0x0001
113/* blocks already reserved */
114#define EXT4_MB_HINT_RESERVED 0x0002
115/* metadata is being allocated */
116#define EXT4_MB_HINT_METADATA 0x0004
117/* first blocks in the file */
118#define EXT4_MB_HINT_FIRST 0x0008
119/* search for the best chunk */
120#define EXT4_MB_HINT_BEST 0x0010
121/* data is being allocated */
122#define EXT4_MB_HINT_DATA 0x0020
123/* don't preallocate (for tails) */
124#define EXT4_MB_HINT_NOPREALLOC 0x0040
125/* allocate for locality group */
126#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
127/* allocate goal blocks or none */
128#define EXT4_MB_HINT_GOAL_ONLY 0x0100
129/* goal is meaningful */
130#define EXT4_MB_HINT_TRY_GOAL 0x0200
131/* blocks already pre-reserved by delayed allocation */
132#define EXT4_MB_DELALLOC_RESERVED 0x0400
133/* We are doing stream allocation */
134#define EXT4_MB_STREAM_ALLOC 0x0800
135/* Use reserved root blocks if needed */
136#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
137/* Use blocks from reserved pool */
138#define EXT4_MB_USE_RESERVED 0x2000
139
140struct ext4_allocation_request {
141 /* target inode for block we're allocating */
142 struct inode *inode;
143 /* how many blocks we want to allocate */
144 unsigned int len;
145 /* logical block in target inode */
146 ext4_lblk_t logical;
147 /* the closest logical allocated block to the left */
148 ext4_lblk_t lleft;
149 /* the closest logical allocated block to the right */
150 ext4_lblk_t lright;
151 /* phys. target (a hint) */
152 ext4_fsblk_t goal;
153 /* phys. block for the closest logical allocated block to the left */
154 ext4_fsblk_t pleft;
155 /* phys. block for the closest logical allocated block to the right */
156 ext4_fsblk_t pright;
157 /* flags. see above EXT4_MB_HINT_* */
158 unsigned int flags;
159};
160
161/*
162 * Logical to physical block mapping, used by ext4_map_blocks()
163 *
164 * This structure is used to pass requests into ext4_map_blocks() as
165 * well as to store the information returned by ext4_map_blocks(). It
166 * takes less room on the stack than a struct buffer_head.
167 */
168#define EXT4_MAP_NEW (1 << BH_New)
169#define EXT4_MAP_MAPPED (1 << BH_Mapped)
170#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
171#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
172#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
173 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
174
175struct ext4_map_blocks {
176 ext4_fsblk_t m_pblk;
177 ext4_lblk_t m_lblk;
178 unsigned int m_len;
179 unsigned int m_flags;
180};
181
182/*
183 * Flags for ext4_io_end->flags
184 */
185#define EXT4_IO_END_UNWRITTEN 0x0001
186
187/*
188 * For converting unwritten extents on a work queue. 'handle' is used for
189 * buffered writeback.
190 */
191typedef struct ext4_io_end {
192 struct list_head list; /* per-file finished IO list */
193 handle_t *handle; /* handle reserved for extent
194 * conversion */
195 struct inode *inode; /* file being written to */
196 struct bio *bio; /* Linked list of completed
197 * bios covering the extent */
198 unsigned int flag; /* unwritten or not */
199 atomic_t count; /* reference counter */
200 loff_t offset; /* offset in the file */
201 ssize_t size; /* size of the extent */
202} ext4_io_end_t;
203
204struct ext4_io_submit {
205 struct writeback_control *io_wbc;
206 struct bio *io_bio;
207 ext4_io_end_t *io_end;
208 sector_t io_next_block;
209};
210
211/*
212 * Special inodes numbers
213 */
214#define EXT4_BAD_INO 1 /* Bad blocks inode */
215#define EXT4_ROOT_INO 2 /* Root inode */
216#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
217#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
218#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
219#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
220#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
221#define EXT4_JOURNAL_INO 8 /* Journal inode */
222
223/* First non-reserved inode for old ext4 filesystems */
224#define EXT4_GOOD_OLD_FIRST_INO 11
225
226/*
227 * Maximal count of links to a file
228 */
229#define EXT4_LINK_MAX 65000
230
231/*
232 * Macro-instructions used to manage several block sizes
233 */
234#define EXT4_MIN_BLOCK_SIZE 1024
235#define EXT4_MAX_BLOCK_SIZE 65536
236#define EXT4_MIN_BLOCK_LOG_SIZE 10
237#define EXT4_MAX_BLOCK_LOG_SIZE 16
238#define EXT4_MAX_CLUSTER_LOG_SIZE 30
239#ifdef __KERNEL__
240# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
241#else
242# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
243#endif
244#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
245#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
246 EXT4_SB(s)->s_cluster_bits)
247#ifdef __KERNEL__
248# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
249# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
250#else
251# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
252#endif
253#ifdef __KERNEL__
254#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
255#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
256#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
257#else
258#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
259 EXT4_GOOD_OLD_INODE_SIZE : \
260 (s)->s_inode_size)
261#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
262 EXT4_GOOD_OLD_FIRST_INO : \
263 (s)->s_first_ino)
264#endif
265#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
266#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
267 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
268 blkbits))
269
270/* Translate a block number to a cluster number */
271#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
272/* Translate a cluster number to a block number */
273#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
274/* Translate # of blks to # of clusters */
275#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
276 (sbi)->s_cluster_bits)
277/* Mask out the low bits to get the starting block of the cluster */
278#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
279 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
280#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
281 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
282/* Get the cluster offset */
283#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
284 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
285#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
286 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
287
288/*
289 * Structure of a blocks group descriptor
290 */
291struct ext4_group_desc
292{
293 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
294 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
295 __le32 bg_inode_table_lo; /* Inodes table block */
296 __le16 bg_free_blocks_count_lo;/* Free blocks count */
297 __le16 bg_free_inodes_count_lo;/* Free inodes count */
298 __le16 bg_used_dirs_count_lo; /* Directories count */
299 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
300 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
301 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
302 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
303 __le16 bg_itable_unused_lo; /* Unused inodes count */
304 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
305 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
306 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
307 __le32 bg_inode_table_hi; /* Inodes table block MSB */
308 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
309 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
310 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
311 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
312 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
313 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
314 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
315 __u32 bg_reserved;
316};
317
318#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
319 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
320 sizeof(__le16))
321#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
322 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
323 sizeof(__le16))
324
325/*
326 * Structure of a flex block group info
327 */
328
329struct flex_groups {
330 atomic64_t free_clusters;
331 atomic_t free_inodes;
332 atomic_t used_dirs;
333};
334
335#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
336#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
337#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
338
339/*
340 * Macro-instructions used to manage group descriptors
341 */
342#define EXT4_MIN_DESC_SIZE 32
343#define EXT4_MIN_DESC_SIZE_64BIT 64
344#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
345#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
346#ifdef __KERNEL__
347# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
348# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
349# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
350# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
351# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
352#else
353# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
354# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
355# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
356#endif
357
358/*
359 * Constants relative to the data blocks
360 */
361#define EXT4_NDIR_BLOCKS 12
362#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
363#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
364#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
365#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
366
367/*
368 * Inode flags
369 */
370#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
371#define EXT4_UNRM_FL 0x00000002 /* Undelete */
372#define EXT4_COMPR_FL 0x00000004 /* Compress file */
373#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
374#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
375#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
376#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
377#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
378/* Reserved for compression usage... */
379#define EXT4_DIRTY_FL 0x00000100
380#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
381#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
382 /* nb: was previously EXT2_ECOMPR_FL */
383#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
384/* End compression flags --- maybe not all used */
385#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
386#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
387#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
388#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
389#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
390#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
391#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
392#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
393#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
394#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
395#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
396#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
397#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
398
399#define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */
400#define EXT4_FL_USER_MODIFIABLE 0x204BC0FF /* User modifiable flags */
401
402/* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
403#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
404 EXT4_IMMUTABLE_FL | \
405 EXT4_APPEND_FL | \
406 EXT4_NODUMP_FL | \
407 EXT4_NOATIME_FL | \
408 EXT4_PROJINHERIT_FL)
409
410/* Flags that should be inherited by new inodes from their parent. */
411#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
412 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
413 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
414 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
415 EXT4_PROJINHERIT_FL)
416
417/* Flags that are appropriate for regular files (all but dir-specific ones). */
418#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
419
420/* Flags that are appropriate for non-directories/regular files. */
421#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
422
423/* Mask out flags that are inappropriate for the given type of inode. */
424static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
425{
426 if (S_ISDIR(mode))
427 return flags;
428 else if (S_ISREG(mode))
429 return flags & EXT4_REG_FLMASK;
430 else
431 return flags & EXT4_OTHER_FLMASK;
432}
433
434/*
435 * Inode flags used for atomic set/get
436 */
437enum {
438 EXT4_INODE_SECRM = 0, /* Secure deletion */
439 EXT4_INODE_UNRM = 1, /* Undelete */
440 EXT4_INODE_COMPR = 2, /* Compress file */
441 EXT4_INODE_SYNC = 3, /* Synchronous updates */
442 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
443 EXT4_INODE_APPEND = 5, /* writes to file may only append */
444 EXT4_INODE_NODUMP = 6, /* do not dump file */
445 EXT4_INODE_NOATIME = 7, /* do not update atime */
446/* Reserved for compression usage... */
447 EXT4_INODE_DIRTY = 8,
448 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
449 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
450 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
451/* End compression flags --- maybe not all used */
452 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
453 EXT4_INODE_IMAGIC = 13, /* AFS directory */
454 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
455 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
456 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
457 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
458 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
459 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
460 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
461 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
462 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
463 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
464 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
465};
466
467/*
468 * Since it's pretty easy to mix up bit numbers and hex values, we use a
469 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
470 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
471 * any extra space in the compiled kernel image, otherwise, the build will fail.
472 * It's important that these values are the same, since we are using
473 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
474 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
475 * values found in ext2, ext3 and ext4 filesystems, and of course the values
476 * defined in e2fsprogs.
477 *
478 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
479 */
480#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
481#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
482
483static inline void ext4_check_flag_values(void)
484{
485 CHECK_FLAG_VALUE(SECRM);
486 CHECK_FLAG_VALUE(UNRM);
487 CHECK_FLAG_VALUE(COMPR);
488 CHECK_FLAG_VALUE(SYNC);
489 CHECK_FLAG_VALUE(IMMUTABLE);
490 CHECK_FLAG_VALUE(APPEND);
491 CHECK_FLAG_VALUE(NODUMP);
492 CHECK_FLAG_VALUE(NOATIME);
493 CHECK_FLAG_VALUE(DIRTY);
494 CHECK_FLAG_VALUE(COMPRBLK);
495 CHECK_FLAG_VALUE(NOCOMPR);
496 CHECK_FLAG_VALUE(ENCRYPT);
497 CHECK_FLAG_VALUE(INDEX);
498 CHECK_FLAG_VALUE(IMAGIC);
499 CHECK_FLAG_VALUE(JOURNAL_DATA);
500 CHECK_FLAG_VALUE(NOTAIL);
501 CHECK_FLAG_VALUE(DIRSYNC);
502 CHECK_FLAG_VALUE(TOPDIR);
503 CHECK_FLAG_VALUE(HUGE_FILE);
504 CHECK_FLAG_VALUE(EXTENTS);
505 CHECK_FLAG_VALUE(EA_INODE);
506 CHECK_FLAG_VALUE(EOFBLOCKS);
507 CHECK_FLAG_VALUE(INLINE_DATA);
508 CHECK_FLAG_VALUE(PROJINHERIT);
509 CHECK_FLAG_VALUE(RESERVED);
510}
511
512/* Used to pass group descriptor data when online resize is done */
513struct ext4_new_group_input {
514 __u32 group; /* Group number for this data */
515 __u64 block_bitmap; /* Absolute block number of block bitmap */
516 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
517 __u64 inode_table; /* Absolute block number of inode table start */
518 __u32 blocks_count; /* Total number of blocks in this group */
519 __u16 reserved_blocks; /* Number of reserved blocks in this group */
520 __u16 unused;
521};
522
523#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
524struct compat_ext4_new_group_input {
525 u32 group;
526 compat_u64 block_bitmap;
527 compat_u64 inode_bitmap;
528 compat_u64 inode_table;
529 u32 blocks_count;
530 u16 reserved_blocks;
531 u16 unused;
532};
533#endif
534
535/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
536struct ext4_new_group_data {
537 __u32 group;
538 __u64 block_bitmap;
539 __u64 inode_bitmap;
540 __u64 inode_table;
541 __u32 blocks_count;
542 __u16 reserved_blocks;
543 __u16 unused;
544 __u32 free_blocks_count;
545};
546
547/* Indexes used to index group tables in ext4_new_group_data */
548enum {
549 BLOCK_BITMAP = 0, /* block bitmap */
550 INODE_BITMAP, /* inode bitmap */
551 INODE_TABLE, /* inode tables */
552 GROUP_TABLE_COUNT,
553};
554
555/*
556 * Flags used by ext4_map_blocks()
557 */
558 /* Allocate any needed blocks and/or convert an unwritten
559 extent to be an initialized ext4 */
560#define EXT4_GET_BLOCKS_CREATE 0x0001
561 /* Request the creation of an unwritten extent */
562#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
563#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
564 EXT4_GET_BLOCKS_CREATE)
565 /* Caller is from the delayed allocation writeout path
566 * finally doing the actual allocation of delayed blocks */
567#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
568 /* caller is from the direct IO path, request to creation of an
569 unwritten extents if not allocated, split the unwritten
570 extent if blocks has been preallocated already*/
571#define EXT4_GET_BLOCKS_PRE_IO 0x0008
572#define EXT4_GET_BLOCKS_CONVERT 0x0010
573#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
574 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
575 /* Convert extent to initialized after IO complete */
576#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
577 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
578 /* Eventual metadata allocation (due to growing extent tree)
579 * should not fail, so try to use reserved blocks for that.*/
580#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
581 /* Don't normalize allocation size (used for fallocate) */
582#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
583 /* Request will not result in inode size update (user for fallocate) */
584#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
585 /* Convert written extents to unwritten */
586#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
587 /* Write zeros to newly created written extents */
588#define EXT4_GET_BLOCKS_ZERO 0x0200
589#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
590 EXT4_GET_BLOCKS_ZERO)
591 /* Caller will submit data before dropping transaction handle. This
592 * allows jbd2 to avoid submitting data before commit. */
593#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
594
595/*
596 * The bit position of these flags must not overlap with any of the
597 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
598 * read_extent_tree_block(), ext4_split_extent_at(),
599 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
600 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
601 * caching the extents when reading from the extent tree while a
602 * truncate or punch hole operation is in progress.
603 */
604#define EXT4_EX_NOCACHE 0x40000000
605#define EXT4_EX_FORCE_CACHE 0x20000000
606
607/*
608 * Flags used by ext4_free_blocks
609 */
610#define EXT4_FREE_BLOCKS_METADATA 0x0001
611#define EXT4_FREE_BLOCKS_FORGET 0x0002
612#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
613#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
614#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
615#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
616
617/*
618 * ioctl commands
619 */
620#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
621#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
622#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
623#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
624#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
625#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
626#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
627#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
628#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
629#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
630#define EXT4_IOC_MIGRATE _IO('f', 9)
631 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
632 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
633#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
634#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
635#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
636#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
637#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
638#define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
639#define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
640#define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
641
642#ifndef FS_IOC_FSGETXATTR
643/* Until the uapi changes get merged for project quota... */
644
645#define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)
646#define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)
647
648/*
649 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
650 */
651struct fsxattr {
652 __u32 fsx_xflags; /* xflags field value (get/set) */
653 __u32 fsx_extsize; /* extsize field value (get/set)*/
654 __u32 fsx_nextents; /* nextents field value (get) */
655 __u32 fsx_projid; /* project identifier (get/set) */
656 unsigned char fsx_pad[12];
657};
658
659/*
660 * Flags for the fsx_xflags field
661 */
662#define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
663#define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
664#define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
665#define FS_XFLAG_APPEND 0x00000010 /* all writes append */
666#define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
667#define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */
668#define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
669#define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
670#define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
671#define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
672#define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
673#define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
674#define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
675#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
676#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
677#endif /* !defined(FS_IOC_FSGETXATTR) */
678
679#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
680#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
681
682#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
683/*
684 * ioctl commands in 32 bit emulation
685 */
686#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
687#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
688#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
689#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
690#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
691#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
692#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
693#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
694#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
695#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
696#endif
697
698/* Max physical block we can address w/o extents */
699#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
700
701/*
702 * Structure of an inode on the disk
703 */
704struct ext4_inode {
705 __le16 i_mode; /* File mode */
706 __le16 i_uid; /* Low 16 bits of Owner Uid */
707 __le32 i_size_lo; /* Size in bytes */
708 __le32 i_atime; /* Access time */
709 __le32 i_ctime; /* Inode Change time */
710 __le32 i_mtime; /* Modification time */
711 __le32 i_dtime; /* Deletion Time */
712 __le16 i_gid; /* Low 16 bits of Group Id */
713 __le16 i_links_count; /* Links count */
714 __le32 i_blocks_lo; /* Blocks count */
715 __le32 i_flags; /* File flags */
716 union {
717 struct {
718 __le32 l_i_version;
719 } linux1;
720 struct {
721 __u32 h_i_translator;
722 } hurd1;
723 struct {
724 __u32 m_i_reserved1;
725 } masix1;
726 } osd1; /* OS dependent 1 */
727 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
728 __le32 i_generation; /* File version (for NFS) */
729 __le32 i_file_acl_lo; /* File ACL */
730 __le32 i_size_high;
731 __le32 i_obso_faddr; /* Obsoleted fragment address */
732 union {
733 struct {
734 __le16 l_i_blocks_high; /* were l_i_reserved1 */
735 __le16 l_i_file_acl_high;
736 __le16 l_i_uid_high; /* these 2 fields */
737 __le16 l_i_gid_high; /* were reserved2[0] */
738 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
739 __le16 l_i_reserved;
740 } linux2;
741 struct {
742 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
743 __u16 h_i_mode_high;
744 __u16 h_i_uid_high;
745 __u16 h_i_gid_high;
746 __u32 h_i_author;
747 } hurd2;
748 struct {
749 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
750 __le16 m_i_file_acl_high;
751 __u32 m_i_reserved2[2];
752 } masix2;
753 } osd2; /* OS dependent 2 */
754 __le16 i_extra_isize;
755 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
756 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
757 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
758 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
759 __le32 i_crtime; /* File Creation time */
760 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
761 __le32 i_version_hi; /* high 32 bits for 64-bit version */
762 __le32 i_projid; /* Project ID */
763};
764
765struct move_extent {
766 __u32 reserved; /* should be zero */
767 __u32 donor_fd; /* donor file descriptor */
768 __u64 orig_start; /* logical start offset in block for orig */
769 __u64 donor_start; /* logical start offset in block for donor */
770 __u64 len; /* block length to be moved */
771 __u64 moved_len; /* moved block length */
772};
773
774#define EXT4_EPOCH_BITS 2
775#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
776#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
777
778/*
779 * Extended fields will fit into an inode if the filesystem was formatted
780 * with large inodes (-I 256 or larger) and there are not currently any EAs
781 * consuming all of the available space. For new inodes we always reserve
782 * enough space for the kernel's known extended fields, but for inodes
783 * created with an old kernel this might not have been the case. None of
784 * the extended inode fields is critical for correct filesystem operation.
785 * This macro checks if a certain field fits in the inode. Note that
786 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
787 */
788#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
789 ((offsetof(typeof(*ext4_inode), field) + \
790 sizeof((ext4_inode)->field)) \
791 <= (EXT4_GOOD_OLD_INODE_SIZE + \
792 (einode)->i_extra_isize)) \
793
794/*
795 * We use an encoding that preserves the times for extra epoch "00":
796 *
797 * extra msb of adjust for signed
798 * epoch 32-bit 32-bit tv_sec to
799 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
800 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
801 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
802 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
803 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
804 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
805 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
806 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
807 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
808 *
809 * Note that previous versions of the kernel on 64-bit systems would
810 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
811 * 1970. e2fsck will correct this, assuming that it is run on the
812 * affected filesystem before 2242.
813 */
814
815static inline __le32 ext4_encode_extra_time(struct timespec *time)
816{
817 u32 extra = sizeof(time->tv_sec) > 4 ?
818 ((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;
819 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
820}
821
822static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
823{
824 if (unlikely(sizeof(time->tv_sec) > 4 &&
825 (extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {
826#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
827 /* Handle legacy encoding of pre-1970 dates with epoch
828 * bits 1,1. We assume that by kernel version 4.20,
829 * everyone will have run fsck over the affected
830 * filesystems to correct the problem. (This
831 * backwards compatibility may be removed before this
832 * time, at the discretion of the ext4 developers.)
833 */
834 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
835 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
836 extra_bits = 0;
837 time->tv_sec += extra_bits << 32;
838#else
839 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
840#endif
841 }
842 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
843}
844
845#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
846do { \
847 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
848 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
849 (raw_inode)->xtime ## _extra = \
850 ext4_encode_extra_time(&(inode)->xtime); \
851} while (0)
852
853#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
854do { \
855 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
856 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
857 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
858 (raw_inode)->xtime ## _extra = \
859 ext4_encode_extra_time(&(einode)->xtime); \
860} while (0)
861
862#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
863do { \
864 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
865 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
866 ext4_decode_extra_time(&(inode)->xtime, \
867 raw_inode->xtime ## _extra); \
868 else \
869 (inode)->xtime.tv_nsec = 0; \
870} while (0)
871
872#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
873do { \
874 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
875 (einode)->xtime.tv_sec = \
876 (signed)le32_to_cpu((raw_inode)->xtime); \
877 else \
878 (einode)->xtime.tv_sec = 0; \
879 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
880 ext4_decode_extra_time(&(einode)->xtime, \
881 raw_inode->xtime ## _extra); \
882 else \
883 (einode)->xtime.tv_nsec = 0; \
884} while (0)
885
886#define i_disk_version osd1.linux1.l_i_version
887
888#if defined(__KERNEL__) || defined(__linux__)
889#define i_reserved1 osd1.linux1.l_i_reserved1
890#define i_file_acl_high osd2.linux2.l_i_file_acl_high
891#define i_blocks_high osd2.linux2.l_i_blocks_high
892#define i_uid_low i_uid
893#define i_gid_low i_gid
894#define i_uid_high osd2.linux2.l_i_uid_high
895#define i_gid_high osd2.linux2.l_i_gid_high
896#define i_checksum_lo osd2.linux2.l_i_checksum_lo
897
898#elif defined(__GNU__)
899
900#define i_translator osd1.hurd1.h_i_translator
901#define i_uid_high osd2.hurd2.h_i_uid_high
902#define i_gid_high osd2.hurd2.h_i_gid_high
903#define i_author osd2.hurd2.h_i_author
904
905#elif defined(__masix__)
906
907#define i_reserved1 osd1.masix1.m_i_reserved1
908#define i_file_acl_high osd2.masix2.m_i_file_acl_high
909#define i_reserved2 osd2.masix2.m_i_reserved2
910
911#endif /* defined(__KERNEL__) || defined(__linux__) */
912
913#include "extents_status.h"
914
915/*
916 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
917 *
918 * These are needed to avoid lockdep false positives when we need to
919 * allocate blocks to the quota inode during ext4_map_blocks(), while
920 * holding i_data_sem for a normal (non-quota) inode. Since we don't
921 * do quota tracking for the quota inode, this avoids deadlock (as
922 * well as infinite recursion, since it isn't turtles all the way
923 * down...)
924 *
925 * I_DATA_SEM_NORMAL - Used for most inodes
926 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
927 * where the second inode has larger inode number
928 * than the first
929 * I_DATA_SEM_QUOTA - Used for quota inodes only
930 */
931enum {
932 I_DATA_SEM_NORMAL = 0,
933 I_DATA_SEM_OTHER,
934 I_DATA_SEM_QUOTA,
935};
936
937
938/*
939 * fourth extended file system inode data in memory
940 */
941struct ext4_inode_info {
942 __le32 i_data[15]; /* unconverted */
943 __u32 i_dtime;
944 ext4_fsblk_t i_file_acl;
945
946 /*
947 * i_block_group is the number of the block group which contains
948 * this file's inode. Constant across the lifetime of the inode,
949 * it is ued for making block allocation decisions - we try to
950 * place a file's data blocks near its inode block, and new inodes
951 * near to their parent directory's inode.
952 */
953 ext4_group_t i_block_group;
954 ext4_lblk_t i_dir_start_lookup;
955#if (BITS_PER_LONG < 64)
956 unsigned long i_state_flags; /* Dynamic state flags */
957#endif
958 unsigned long i_flags;
959
960 /*
961 * Extended attributes can be read independently of the main file
962 * data. Taking i_mutex even when reading would cause contention
963 * between readers of EAs and writers of regular file data, so
964 * instead we synchronize on xattr_sem when reading or changing
965 * EAs.
966 */
967 struct rw_semaphore xattr_sem;
968
969 struct list_head i_orphan; /* unlinked but open inodes */
970
971 /*
972 * i_disksize keeps track of what the inode size is ON DISK, not
973 * in memory. During truncate, i_size is set to the new size by
974 * the VFS prior to calling ext4_truncate(), but the filesystem won't
975 * set i_disksize to 0 until the truncate is actually under way.
976 *
977 * The intent is that i_disksize always represents the blocks which
978 * are used by this file. This allows recovery to restart truncate
979 * on orphans if we crash during truncate. We actually write i_disksize
980 * into the on-disk inode when writing inodes out, instead of i_size.
981 *
982 * The only time when i_disksize and i_size may be different is when
983 * a truncate is in progress. The only things which change i_disksize
984 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
985 */
986 loff_t i_disksize;
987
988 /*
989 * i_data_sem is for serialising ext4_truncate() against
990 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
991 * data tree are chopped off during truncate. We can't do that in
992 * ext4 because whenever we perform intermediate commits during
993 * truncate, the inode and all the metadata blocks *must* be in a
994 * consistent state which allows truncation of the orphans to restart
995 * during recovery. Hence we must fix the get_block-vs-truncate race
996 * by other means, so we have i_data_sem.
997 */
998 struct rw_semaphore i_data_sem;
999 /*
1000 * i_mmap_sem is for serializing page faults with truncate / punch hole
1001 * operations. We have to make sure that new page cannot be faulted in
1002 * a section of the inode that is being punched. We cannot easily use
1003 * i_data_sem for this since we need protection for the whole punch
1004 * operation and i_data_sem ranks below transaction start so we have
1005 * to occasionally drop it.
1006 */
1007 struct rw_semaphore i_mmap_sem;
1008 struct inode vfs_inode;
1009 struct jbd2_inode *jinode;
1010
1011 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1012
1013 /*
1014 * File creation time. Its function is same as that of
1015 * struct timespec i_{a,c,m}time in the generic inode.
1016 */
1017 struct timespec i_crtime;
1018
1019 /* mballoc */
1020 struct list_head i_prealloc_list;
1021 spinlock_t i_prealloc_lock;
1022
1023 /* extents status tree */
1024 struct ext4_es_tree i_es_tree;
1025 rwlock_t i_es_lock;
1026 struct list_head i_es_list;
1027 unsigned int i_es_all_nr; /* protected by i_es_lock */
1028 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1029 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1030 extents to shrink. Protected by
1031 i_es_lock */
1032
1033 /* ialloc */
1034 ext4_group_t i_last_alloc_group;
1035
1036 /* allocation reservation info for delalloc */
1037 /* In case of bigalloc, these refer to clusters rather than blocks */
1038 unsigned int i_reserved_data_blocks;
1039 unsigned int i_reserved_meta_blocks;
1040 unsigned int i_allocated_meta_blocks;
1041 ext4_lblk_t i_da_metadata_calc_last_lblock;
1042 int i_da_metadata_calc_len;
1043
1044 /* on-disk additional length */
1045 __u16 i_extra_isize;
1046
1047 /* Indicate the inline data space. */
1048 u16 i_inline_off;
1049 u16 i_inline_size;
1050
1051#ifdef CONFIG_QUOTA
1052 /* quota space reservation, managed internally by quota code */
1053 qsize_t i_reserved_quota;
1054#endif
1055
1056 /* Lock protecting lists below */
1057 spinlock_t i_completed_io_lock;
1058 /*
1059 * Completed IOs that need unwritten extents handling and have
1060 * transaction reserved
1061 */
1062 struct list_head i_rsv_conversion_list;
1063 struct work_struct i_rsv_conversion_work;
1064 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1065
1066 spinlock_t i_block_reservation_lock;
1067
1068 /*
1069 * Transactions that contain inode's metadata needed to complete
1070 * fsync and fdatasync, respectively.
1071 */
1072 tid_t i_sync_tid;
1073 tid_t i_datasync_tid;
1074
1075#ifdef CONFIG_QUOTA
1076 struct dquot *i_dquot[MAXQUOTAS];
1077#endif
1078
1079 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1080 __u32 i_csum_seed;
1081
1082 kprojid_t i_projid;
1083};
1084
1085/*
1086 * File system states
1087 */
1088#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1089#define EXT4_ERROR_FS 0x0002 /* Errors detected */
1090#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1091
1092/*
1093 * Misc. filesystem flags
1094 */
1095#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1096#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1097#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1098
1099/*
1100 * Mount flags set via mount options or defaults
1101 */
1102#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1103#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1104#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1105#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1106#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1107#define EXT4_MOUNT_ERRORS_MASK 0x00070
1108#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1109#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1110#ifdef CONFIG_FS_DAX
1111#define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
1112#else
1113#define EXT4_MOUNT_DAX 0
1114#endif
1115#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1116#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1117#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1118#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1119#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1120#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1121#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1122#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1123#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1124#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1125#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1126#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1127 * enable enforcement for hidden
1128 * quota files */
1129#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1130 * enforcement for hidden quota
1131 * files */
1132#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1133 * enforcement */
1134#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1135#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1136#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1137#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1138#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1139#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1140#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1141#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1142
1143/*
1144 * Mount flags set either automatically (could not be set by mount option)
1145 * based on per file system feature or property or in special cases such as
1146 * distinguishing between explicit mount option definition and default.
1147 */
1148#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1149 specified delalloc */
1150#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1151 size of blocksize * 8
1152 blocks */
1153#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1154 file systems */
1155
1156#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1157 specified journal checksum */
1158
1159#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1160 ~EXT4_MOUNT_##opt
1161#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1162 EXT4_MOUNT_##opt
1163#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1164 EXT4_MOUNT_##opt)
1165
1166#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1167 ~EXT4_MOUNT2_##opt
1168#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1169 EXT4_MOUNT2_##opt
1170#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1171 EXT4_MOUNT2_##opt)
1172
1173#define ext4_test_and_set_bit __test_and_set_bit_le
1174#define ext4_set_bit __set_bit_le
1175#define ext4_set_bit_atomic ext2_set_bit_atomic
1176#define ext4_test_and_clear_bit __test_and_clear_bit_le
1177#define ext4_clear_bit __clear_bit_le
1178#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1179#define ext4_test_bit test_bit_le
1180#define ext4_find_next_zero_bit find_next_zero_bit_le
1181#define ext4_find_next_bit find_next_bit_le
1182
1183extern void ext4_set_bits(void *bm, int cur, int len);
1184
1185/*
1186 * Maximal mount counts between two filesystem checks
1187 */
1188#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1189#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1190
1191/*
1192 * Behaviour when detecting errors
1193 */
1194#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1195#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1196#define EXT4_ERRORS_PANIC 3 /* Panic */
1197#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1198
1199/* Metadata checksum algorithm codes */
1200#define EXT4_CRC32C_CHKSUM 1
1201
1202/*
1203 * Structure of the super block
1204 */
1205struct ext4_super_block {
1206/*00*/ __le32 s_inodes_count; /* Inodes count */
1207 __le32 s_blocks_count_lo; /* Blocks count */
1208 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1209 __le32 s_free_blocks_count_lo; /* Free blocks count */
1210/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1211 __le32 s_first_data_block; /* First Data Block */
1212 __le32 s_log_block_size; /* Block size */
1213 __le32 s_log_cluster_size; /* Allocation cluster size */
1214/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1215 __le32 s_clusters_per_group; /* # Clusters per group */
1216 __le32 s_inodes_per_group; /* # Inodes per group */
1217 __le32 s_mtime; /* Mount time */
1218/*30*/ __le32 s_wtime; /* Write time */
1219 __le16 s_mnt_count; /* Mount count */
1220 __le16 s_max_mnt_count; /* Maximal mount count */
1221 __le16 s_magic; /* Magic signature */
1222 __le16 s_state; /* File system state */
1223 __le16 s_errors; /* Behaviour when detecting errors */
1224 __le16 s_minor_rev_level; /* minor revision level */
1225/*40*/ __le32 s_lastcheck; /* time of last check */
1226 __le32 s_checkinterval; /* max. time between checks */
1227 __le32 s_creator_os; /* OS */
1228 __le32 s_rev_level; /* Revision level */
1229/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1230 __le16 s_def_resgid; /* Default gid for reserved blocks */
1231 /*
1232 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1233 *
1234 * Note: the difference between the compatible feature set and
1235 * the incompatible feature set is that if there is a bit set
1236 * in the incompatible feature set that the kernel doesn't
1237 * know about, it should refuse to mount the filesystem.
1238 *
1239 * e2fsck's requirements are more strict; if it doesn't know
1240 * about a feature in either the compatible or incompatible
1241 * feature set, it must abort and not try to meddle with
1242 * things it doesn't understand...
1243 */
1244 __le32 s_first_ino; /* First non-reserved inode */
1245 __le16 s_inode_size; /* size of inode structure */
1246 __le16 s_block_group_nr; /* block group # of this superblock */
1247 __le32 s_feature_compat; /* compatible feature set */
1248/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1249 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1250/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1251/*78*/ char s_volume_name[16]; /* volume name */
1252/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1253/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1254 /*
1255 * Performance hints. Directory preallocation should only
1256 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1257 */
1258 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1259 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1260 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1261 /*
1262 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1263 */
1264/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1265/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1266 __le32 s_journal_dev; /* device number of journal file */
1267 __le32 s_last_orphan; /* start of list of inodes to delete */
1268 __le32 s_hash_seed[4]; /* HTREE hash seed */
1269 __u8 s_def_hash_version; /* Default hash version to use */
1270 __u8 s_jnl_backup_type;
1271 __le16 s_desc_size; /* size of group descriptor */
1272/*100*/ __le32 s_default_mount_opts;
1273 __le32 s_first_meta_bg; /* First metablock block group */
1274 __le32 s_mkfs_time; /* When the filesystem was created */
1275 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1276 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1277/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1278 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1279 __le32 s_free_blocks_count_hi; /* Free blocks count */
1280 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1281 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1282 __le32 s_flags; /* Miscellaneous flags */
1283 __le16 s_raid_stride; /* RAID stride */
1284 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1285 __le64 s_mmp_block; /* Block for multi-mount protection */
1286 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1287 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1288 __u8 s_checksum_type; /* metadata checksum algorithm used */
1289 __u8 s_encryption_level; /* versioning level for encryption */
1290 __u8 s_reserved_pad; /* Padding to next 32bits */
1291 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1292 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1293 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1294 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1295 snapshot's future use */
1296 __le32 s_snapshot_list; /* inode number of the head of the
1297 on-disk snapshot list */
1298#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1299 __le32 s_error_count; /* number of fs errors */
1300 __le32 s_first_error_time; /* first time an error happened */
1301 __le32 s_first_error_ino; /* inode involved in first error */
1302 __le64 s_first_error_block; /* block involved of first error */
1303 __u8 s_first_error_func[32]; /* function where the error happened */
1304 __le32 s_first_error_line; /* line number where error happened */
1305 __le32 s_last_error_time; /* most recent time of an error */
1306 __le32 s_last_error_ino; /* inode involved in last error */
1307 __le32 s_last_error_line; /* line number where error happened */
1308 __le64 s_last_error_block; /* block involved of last error */
1309 __u8 s_last_error_func[32]; /* function where the error happened */
1310#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1311 __u8 s_mount_opts[64];
1312 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1313 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1314 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1315 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1316 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1317 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1318 __le32 s_lpf_ino; /* Location of the lost+found inode */
1319 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1320 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1321 __le32 s_reserved[98]; /* Padding to the end of the block */
1322 __le32 s_checksum; /* crc32c(superblock) */
1323};
1324
1325#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1326
1327#ifdef __KERNEL__
1328
1329/*
1330 * run-time mount flags
1331 */
1332#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1333#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1334#define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1335
1336#ifdef CONFIG_EXT4_FS_ENCRYPTION
1337#define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1338 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1339#else
1340#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1341#endif
1342
1343/* Number of quota types we support */
1344#define EXT4_MAXQUOTAS 3
1345
1346#ifdef CONFIG_EXT4_FS_ENCRYPTION
1347#define EXT4_KEY_DESC_PREFIX "ext4:"
1348#define EXT4_KEY_DESC_PREFIX_SIZE 5
1349#endif
1350
1351/*
1352 * fourth extended-fs super-block data in memory
1353 */
1354struct ext4_sb_info {
1355 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1356 unsigned long s_inodes_per_block;/* Number of inodes per block */
1357 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1358 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1359 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1360 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1361 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1362 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1363 ext4_group_t s_groups_count; /* Number of groups in the fs */
1364 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1365 unsigned long s_overhead; /* # of fs overhead clusters */
1366 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1367 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1368 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1369 struct buffer_head * s_sbh; /* Buffer containing the super block */
1370 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1371 struct buffer_head **s_group_desc;
1372 unsigned int s_mount_opt;
1373 unsigned int s_mount_opt2;
1374 unsigned int s_mount_flags;
1375 unsigned int s_def_mount_opt;
1376 ext4_fsblk_t s_sb_block;
1377 atomic64_t s_resv_clusters;
1378 kuid_t s_resuid;
1379 kgid_t s_resgid;
1380 unsigned short s_mount_state;
1381 unsigned short s_pad;
1382 int s_addr_per_block_bits;
1383 int s_desc_per_block_bits;
1384 int s_inode_size;
1385 int s_first_ino;
1386 unsigned int s_inode_readahead_blks;
1387 unsigned int s_inode_goal;
1388 spinlock_t s_next_gen_lock;
1389 u32 s_next_generation;
1390 u32 s_hash_seed[4];
1391 int s_def_hash_version;
1392 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1393 struct percpu_counter s_freeclusters_counter;
1394 struct percpu_counter s_freeinodes_counter;
1395 struct percpu_counter s_dirs_counter;
1396 struct percpu_counter s_dirtyclusters_counter;
1397 struct blockgroup_lock *s_blockgroup_lock;
1398 struct proc_dir_entry *s_proc;
1399 struct kobject s_kobj;
1400 struct completion s_kobj_unregister;
1401 struct super_block *s_sb;
1402
1403 /* Journaling */
1404 struct journal_s *s_journal;
1405 struct list_head s_orphan;
1406 struct mutex s_orphan_lock;
1407 unsigned long s_resize_flags; /* Flags indicating if there
1408 is a resizer */
1409 unsigned long s_commit_interval;
1410 u32 s_max_batch_time;
1411 u32 s_min_batch_time;
1412 struct block_device *journal_bdev;
1413#ifdef CONFIG_QUOTA
1414 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
1415 int s_jquota_fmt; /* Format of quota to use */
1416#endif
1417 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1418 struct rb_root system_blks;
1419
1420#ifdef EXTENTS_STATS
1421 /* ext4 extents stats */
1422 unsigned long s_ext_min;
1423 unsigned long s_ext_max;
1424 unsigned long s_depth_max;
1425 spinlock_t s_ext_stats_lock;
1426 unsigned long s_ext_blocks;
1427 unsigned long s_ext_extents;
1428#endif
1429
1430 /* for buddy allocator */
1431 struct ext4_group_info ***s_group_info;
1432 struct inode *s_buddy_cache;
1433 spinlock_t s_md_lock;
1434 unsigned short *s_mb_offsets;
1435 unsigned int *s_mb_maxs;
1436 unsigned int s_group_info_size;
1437 unsigned int s_mb_free_pending;
1438
1439 /* tunables */
1440 unsigned long s_stripe;
1441 unsigned int s_mb_stream_request;
1442 unsigned int s_mb_max_to_scan;
1443 unsigned int s_mb_min_to_scan;
1444 unsigned int s_mb_stats;
1445 unsigned int s_mb_order2_reqs;
1446 unsigned int s_mb_group_prealloc;
1447 unsigned int s_max_dir_size_kb;
1448 /* where last allocation was done - for stream allocation */
1449 unsigned long s_mb_last_group;
1450 unsigned long s_mb_last_start;
1451
1452 /* stats for buddy allocator */
1453 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1454 atomic_t s_bal_success; /* we found long enough chunks */
1455 atomic_t s_bal_allocated; /* in blocks */
1456 atomic_t s_bal_ex_scanned; /* total extents scanned */
1457 atomic_t s_bal_goals; /* goal hits */
1458 atomic_t s_bal_breaks; /* too long searches */
1459 atomic_t s_bal_2orders; /* 2^order hits */
1460 spinlock_t s_bal_lock;
1461 unsigned long s_mb_buddies_generated;
1462 unsigned long long s_mb_generation_time;
1463 atomic_t s_mb_lost_chunks;
1464 atomic_t s_mb_preallocated;
1465 atomic_t s_mb_discarded;
1466 atomic_t s_lock_busy;
1467
1468 /* locality groups */
1469 struct ext4_locality_group __percpu *s_locality_groups;
1470
1471 /* for write statistics */
1472 unsigned long s_sectors_written_start;
1473 u64 s_kbytes_written;
1474
1475 /* the size of zero-out chunk */
1476 unsigned int s_extent_max_zeroout_kb;
1477
1478 unsigned int s_log_groups_per_flex;
1479 struct flex_groups *s_flex_groups;
1480 ext4_group_t s_flex_groups_allocated;
1481
1482 /* workqueue for reserved extent conversions (buffered io) */
1483 struct workqueue_struct *rsv_conversion_wq;
1484
1485 /* timer for periodic error stats printing */
1486 struct timer_list s_err_report;
1487
1488 /* Lazy inode table initialization info */
1489 struct ext4_li_request *s_li_request;
1490 /* Wait multiplier for lazy initialization thread */
1491 unsigned int s_li_wait_mult;
1492
1493 /* Kernel thread for multiple mount protection */
1494 struct task_struct *s_mmp_tsk;
1495
1496 /* record the last minlen when FITRIM is called. */
1497 atomic_t s_last_trim_minblks;
1498
1499 /* Reference to checksum algorithm driver via cryptoapi */
1500 struct crypto_shash *s_chksum_driver;
1501
1502 /* Precomputed FS UUID checksum for seeding other checksums */
1503 __u32 s_csum_seed;
1504
1505 /* Reclaim extents from extent status tree */
1506 struct shrinker s_es_shrinker;
1507 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1508 long s_es_nr_inode;
1509 struct ext4_es_stats s_es_stats;
1510 struct mb_cache *s_mb_cache;
1511 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1512
1513 /* Ratelimit ext4 messages. */
1514 struct ratelimit_state s_err_ratelimit_state;
1515 struct ratelimit_state s_warning_ratelimit_state;
1516 struct ratelimit_state s_msg_ratelimit_state;
1517
1518 /* Barrier between changing inodes' journal flags and writepages ops. */
1519 struct percpu_rw_semaphore s_journal_flag_rwsem;
1520
1521 /* Encryption support */
1522#ifdef CONFIG_EXT4_FS_ENCRYPTION
1523 u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE];
1524 u8 key_prefix_size;
1525#endif
1526};
1527
1528static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1529{
1530 return sb->s_fs_info;
1531}
1532static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1533{
1534 return container_of(inode, struct ext4_inode_info, vfs_inode);
1535}
1536
1537static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1538{
1539 return ino == EXT4_ROOT_INO ||
1540 ino == EXT4_USR_QUOTA_INO ||
1541 ino == EXT4_GRP_QUOTA_INO ||
1542 ino == EXT4_BOOT_LOADER_INO ||
1543 ino == EXT4_JOURNAL_INO ||
1544 ino == EXT4_RESIZE_INO ||
1545 (ino >= EXT4_FIRST_INO(sb) &&
1546 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1547}
1548
1549/*
1550 * Inode dynamic state flags
1551 */
1552enum {
1553 EXT4_STATE_JDATA, /* journaled data exists */
1554 EXT4_STATE_NEW, /* inode is newly created */
1555 EXT4_STATE_XATTR, /* has in-inode xattrs */
1556 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1557 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1558 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1559 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1560 EXT4_STATE_NEWENTRY, /* File just added to dir */
1561 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1562 nolocking */
1563 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1564 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1565};
1566
1567#define EXT4_INODE_BIT_FNS(name, field, offset) \
1568static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1569{ \
1570 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1571} \
1572static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1573{ \
1574 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1575} \
1576static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1577{ \
1578 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1579}
1580
1581/* Add these declarations here only so that these functions can be
1582 * found by name. Otherwise, they are very hard to locate. */
1583static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1584static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1585static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1586EXT4_INODE_BIT_FNS(flag, flags, 0)
1587
1588/* Add these declarations here only so that these functions can be
1589 * found by name. Otherwise, they are very hard to locate. */
1590static inline int ext4_test_inode_state(struct inode *inode, int bit);
1591static inline void ext4_set_inode_state(struct inode *inode, int bit);
1592static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1593#if (BITS_PER_LONG < 64)
1594EXT4_INODE_BIT_FNS(state, state_flags, 0)
1595
1596static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1597{
1598 (ei)->i_state_flags = 0;
1599}
1600#else
1601EXT4_INODE_BIT_FNS(state, flags, 32)
1602
1603static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1604{
1605 /* We depend on the fact that callers will set i_flags */
1606}
1607#endif
1608#else
1609/* Assume that user mode programs are passing in an ext4fs superblock, not
1610 * a kernel struct super_block. This will allow us to call the feature-test
1611 * macros from user land. */
1612#define EXT4_SB(sb) (sb)
1613#endif
1614
1615/*
1616 * Returns true if the inode is inode is encrypted
1617 */
1618#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1619
1620/*
1621 * Codes for operating systems
1622 */
1623#define EXT4_OS_LINUX 0
1624#define EXT4_OS_HURD 1
1625#define EXT4_OS_MASIX 2
1626#define EXT4_OS_FREEBSD 3
1627#define EXT4_OS_LITES 4
1628
1629/*
1630 * Revision levels
1631 */
1632#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1633#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1634
1635#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1636#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1637
1638#define EXT4_GOOD_OLD_INODE_SIZE 128
1639
1640/*
1641 * Feature set definitions
1642 */
1643
1644#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1645#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1646#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1647#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1648#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1649#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1650#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1651
1652#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1653#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1654#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1655#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1656#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1657#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1658#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1659#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1660#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1661/*
1662 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1663 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1664 * all other data structures' checksums. However, the METADATA_CSUM and
1665 * GDT_CSUM bits are mutually exclusive.
1666 */
1667#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1668#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1669#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1670
1671#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1672#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1673#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1674#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1675#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1676#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1677#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1678#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1679#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1680#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1681#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1682#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1683#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1684#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1685#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1686
1687#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1688static inline bool ext4_has_feature_##name(struct super_block *sb) \
1689{ \
1690 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1691 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1692} \
1693static inline void ext4_set_feature_##name(struct super_block *sb) \
1694{ \
1695 EXT4_SB(sb)->s_es->s_feature_compat |= \
1696 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1697} \
1698static inline void ext4_clear_feature_##name(struct super_block *sb) \
1699{ \
1700 EXT4_SB(sb)->s_es->s_feature_compat &= \
1701 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1702}
1703
1704#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1705static inline bool ext4_has_feature_##name(struct super_block *sb) \
1706{ \
1707 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1708 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1709} \
1710static inline void ext4_set_feature_##name(struct super_block *sb) \
1711{ \
1712 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1713 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1714} \
1715static inline void ext4_clear_feature_##name(struct super_block *sb) \
1716{ \
1717 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1718 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1719}
1720
1721#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1722static inline bool ext4_has_feature_##name(struct super_block *sb) \
1723{ \
1724 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1725 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1726} \
1727static inline void ext4_set_feature_##name(struct super_block *sb) \
1728{ \
1729 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1730 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1731} \
1732static inline void ext4_clear_feature_##name(struct super_block *sb) \
1733{ \
1734 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1735 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1736}
1737
1738EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
1739EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
1740EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
1741EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
1742EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
1743EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
1744EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
1745
1746EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
1747EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
1748EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
1749EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
1750EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
1751EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
1752EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
1753EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
1754EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
1755EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
1756EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
1757EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
1758
1759EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
1760EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
1761EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
1762EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
1763EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
1764EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
1765EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
1766EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
1767EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
1768EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
1769EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
1770EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
1771EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
1772EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
1773EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
1774
1775#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1776#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1777 EXT4_FEATURE_INCOMPAT_META_BG)
1778#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1779 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1780 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1781
1782#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1783#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1784 EXT4_FEATURE_INCOMPAT_RECOVER| \
1785 EXT4_FEATURE_INCOMPAT_META_BG)
1786#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1787 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1788 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1789
1790#define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1791#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1792 EXT4_FEATURE_INCOMPAT_RECOVER| \
1793 EXT4_FEATURE_INCOMPAT_META_BG| \
1794 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1795 EXT4_FEATURE_INCOMPAT_64BIT| \
1796 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1797 EXT4_FEATURE_INCOMPAT_MMP | \
1798 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1799 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1800 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1801#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1802 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1803 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1804 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1805 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1806 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1807 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1808 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1809 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1810 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1811 EXT4_FEATURE_RO_COMPAT_PROJECT)
1812
1813#define EXTN_FEATURE_FUNCS(ver) \
1814static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1815{ \
1816 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1817 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1818} \
1819static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1820{ \
1821 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1822 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1823} \
1824static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1825{ \
1826 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1827 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1828}
1829
1830EXTN_FEATURE_FUNCS(2)
1831EXTN_FEATURE_FUNCS(3)
1832EXTN_FEATURE_FUNCS(4)
1833
1834static inline bool ext4_has_compat_features(struct super_block *sb)
1835{
1836 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1837}
1838static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1839{
1840 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1841}
1842static inline bool ext4_has_incompat_features(struct super_block *sb)
1843{
1844 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1845}
1846
1847/*
1848 * Default values for user and/or group using reserved blocks
1849 */
1850#define EXT4_DEF_RESUID 0
1851#define EXT4_DEF_RESGID 0
1852
1853/*
1854 * Default project ID
1855 */
1856#define EXT4_DEF_PROJID 0
1857
1858#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1859
1860/*
1861 * Default mount options
1862 */
1863#define EXT4_DEFM_DEBUG 0x0001
1864#define EXT4_DEFM_BSDGROUPS 0x0002
1865#define EXT4_DEFM_XATTR_USER 0x0004
1866#define EXT4_DEFM_ACL 0x0008
1867#define EXT4_DEFM_UID16 0x0010
1868#define EXT4_DEFM_JMODE 0x0060
1869#define EXT4_DEFM_JMODE_DATA 0x0020
1870#define EXT4_DEFM_JMODE_ORDERED 0x0040
1871#define EXT4_DEFM_JMODE_WBACK 0x0060
1872#define EXT4_DEFM_NOBARRIER 0x0100
1873#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1874#define EXT4_DEFM_DISCARD 0x0400
1875#define EXT4_DEFM_NODELALLOC 0x0800
1876
1877/*
1878 * Default journal batch times
1879 */
1880#define EXT4_DEF_MIN_BATCH_TIME 0
1881#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1882
1883/*
1884 * Minimum number of groups in a flexgroup before we separate out
1885 * directories into the first block group of a flexgroup
1886 */
1887#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1888
1889/*
1890 * Structure of a directory entry
1891 */
1892#define EXT4_NAME_LEN 255
1893
1894struct ext4_dir_entry {
1895 __le32 inode; /* Inode number */
1896 __le16 rec_len; /* Directory entry length */
1897 __le16 name_len; /* Name length */
1898 char name[EXT4_NAME_LEN]; /* File name */
1899};
1900
1901/*
1902 * The new version of the directory entry. Since EXT4 structures are
1903 * stored in intel byte order, and the name_len field could never be
1904 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1905 * file_type field.
1906 */
1907struct ext4_dir_entry_2 {
1908 __le32 inode; /* Inode number */
1909 __le16 rec_len; /* Directory entry length */
1910 __u8 name_len; /* Name length */
1911 __u8 file_type;
1912 char name[EXT4_NAME_LEN]; /* File name */
1913};
1914
1915/*
1916 * This is a bogus directory entry at the end of each leaf block that
1917 * records checksums.
1918 */
1919struct ext4_dir_entry_tail {
1920 __le32 det_reserved_zero1; /* Pretend to be unused */
1921 __le16 det_rec_len; /* 12 */
1922 __u8 det_reserved_zero2; /* Zero name length */
1923 __u8 det_reserved_ft; /* 0xDE, fake file type */
1924 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1925};
1926
1927#define EXT4_DIRENT_TAIL(block, blocksize) \
1928 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1929 ((blocksize) - \
1930 sizeof(struct ext4_dir_entry_tail))))
1931
1932/*
1933 * Ext4 directory file types. Only the low 3 bits are used. The
1934 * other bits are reserved for now.
1935 */
1936#define EXT4_FT_UNKNOWN 0
1937#define EXT4_FT_REG_FILE 1
1938#define EXT4_FT_DIR 2
1939#define EXT4_FT_CHRDEV 3
1940#define EXT4_FT_BLKDEV 4
1941#define EXT4_FT_FIFO 5
1942#define EXT4_FT_SOCK 6
1943#define EXT4_FT_SYMLINK 7
1944
1945#define EXT4_FT_MAX 8
1946
1947#define EXT4_FT_DIR_CSUM 0xDE
1948
1949/*
1950 * EXT4_DIR_PAD defines the directory entries boundaries
1951 *
1952 * NOTE: It must be a multiple of 4
1953 */
1954#define EXT4_DIR_PAD 4
1955#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1956#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1957 ~EXT4_DIR_ROUND)
1958#define EXT4_MAX_REC_LEN ((1<<16)-1)
1959
1960/*
1961 * If we ever get support for fs block sizes > page_size, we'll need
1962 * to remove the #if statements in the next two functions...
1963 */
1964static inline unsigned int
1965ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1966{
1967 unsigned len = le16_to_cpu(dlen);
1968
1969#if (PAGE_SIZE >= 65536)
1970 if (len == EXT4_MAX_REC_LEN || len == 0)
1971 return blocksize;
1972 return (len & 65532) | ((len & 3) << 16);
1973#else
1974 return len;
1975#endif
1976}
1977
1978static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1979{
1980 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1981 BUG();
1982#if (PAGE_SIZE >= 65536)
1983 if (len < 65536)
1984 return cpu_to_le16(len);
1985 if (len == blocksize) {
1986 if (blocksize == 65536)
1987 return cpu_to_le16(EXT4_MAX_REC_LEN);
1988 else
1989 return cpu_to_le16(0);
1990 }
1991 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1992#else
1993 return cpu_to_le16(len);
1994#endif
1995}
1996
1997/*
1998 * Hash Tree Directory indexing
1999 * (c) Daniel Phillips, 2001
2000 */
2001
2002#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2003 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2004#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2005#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2006
2007/* Legal values for the dx_root hash_version field: */
2008
2009#define DX_HASH_LEGACY 0
2010#define DX_HASH_HALF_MD4 1
2011#define DX_HASH_TEA 2
2012#define DX_HASH_LEGACY_UNSIGNED 3
2013#define DX_HASH_HALF_MD4_UNSIGNED 4
2014#define DX_HASH_TEA_UNSIGNED 5
2015
2016static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2017 const void *address, unsigned int length)
2018{
2019 struct {
2020 struct shash_desc shash;
2021 char ctx[4];
2022 } desc;
2023 int err;
2024
2025 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2026
2027 desc.shash.tfm = sbi->s_chksum_driver;
2028 desc.shash.flags = 0;
2029 *(u32 *)desc.ctx = crc;
2030
2031 err = crypto_shash_update(&desc.shash, address, length);
2032 BUG_ON(err);
2033
2034 return *(u32 *)desc.ctx;
2035}
2036
2037#ifdef __KERNEL__
2038
2039/* hash info structure used by the directory hash */
2040struct dx_hash_info
2041{
2042 u32 hash;
2043 u32 minor_hash;
2044 int hash_version;
2045 u32 *seed;
2046};
2047
2048
2049/* 32 and 64 bit signed EOF for dx directories */
2050#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2051#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2052
2053
2054/*
2055 * Control parameters used by ext4_htree_next_block
2056 */
2057#define HASH_NB_ALWAYS 1
2058
2059struct ext4_filename {
2060 const struct qstr *usr_fname;
2061 struct fscrypt_str disk_name;
2062 struct dx_hash_info hinfo;
2063#ifdef CONFIG_EXT4_FS_ENCRYPTION
2064 struct fscrypt_str crypto_buf;
2065#endif
2066};
2067
2068#define fname_name(p) ((p)->disk_name.name)
2069#define fname_len(p) ((p)->disk_name.len)
2070
2071/*
2072 * Describe an inode's exact location on disk and in memory
2073 */
2074struct ext4_iloc
2075{
2076 struct buffer_head *bh;
2077 unsigned long offset;
2078 ext4_group_t block_group;
2079};
2080
2081static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2082{
2083 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2084}
2085
2086/*
2087 * This structure is stuffed into the struct file's private_data field
2088 * for directories. It is where we put information so that we can do
2089 * readdir operations in hash tree order.
2090 */
2091struct dir_private_info {
2092 struct rb_root root;
2093 struct rb_node *curr_node;
2094 struct fname *extra_fname;
2095 loff_t last_pos;
2096 __u32 curr_hash;
2097 __u32 curr_minor_hash;
2098 __u32 next_hash;
2099};
2100
2101/* calculate the first block number of the group */
2102static inline ext4_fsblk_t
2103ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2104{
2105 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2106 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2107}
2108
2109/*
2110 * Special error return code only used by dx_probe() and its callers.
2111 */
2112#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2113
2114/*
2115 * Timeout and state flag for lazy initialization inode thread.
2116 */
2117#define EXT4_DEF_LI_WAIT_MULT 10
2118#define EXT4_DEF_LI_MAX_START_DELAY 5
2119#define EXT4_LAZYINIT_QUIT 0x0001
2120#define EXT4_LAZYINIT_RUNNING 0x0002
2121
2122/*
2123 * Lazy inode table initialization info
2124 */
2125struct ext4_lazy_init {
2126 unsigned long li_state;
2127 struct list_head li_request_list;
2128 struct mutex li_list_mtx;
2129};
2130
2131struct ext4_li_request {
2132 struct super_block *lr_super;
2133 struct ext4_sb_info *lr_sbi;
2134 ext4_group_t lr_next_group;
2135 struct list_head lr_request;
2136 unsigned long lr_next_sched;
2137 unsigned long lr_timeout;
2138};
2139
2140struct ext4_features {
2141 struct kobject f_kobj;
2142 struct completion f_kobj_unregister;
2143};
2144
2145/*
2146 * This structure will be used for multiple mount protection. It will be
2147 * written into the block number saved in the s_mmp_block field in the
2148 * superblock. Programs that check MMP should assume that if
2149 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2150 * to use the filesystem, regardless of how old the timestamp is.
2151 */
2152#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2153#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2154#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2155#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2156
2157struct mmp_struct {
2158 __le32 mmp_magic; /* Magic number for MMP */
2159 __le32 mmp_seq; /* Sequence no. updated periodically */
2160
2161 /*
2162 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2163 * purposes and do not affect the correctness of the algorithm
2164 */
2165 __le64 mmp_time; /* Time last updated */
2166 char mmp_nodename[64]; /* Node which last updated MMP block */
2167 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2168
2169 /*
2170 * mmp_check_interval is used to verify if the MMP block has been
2171 * updated on the block device. The value is updated based on the
2172 * maximum time to write the MMP block during an update cycle.
2173 */
2174 __le16 mmp_check_interval;
2175
2176 __le16 mmp_pad1;
2177 __le32 mmp_pad2[226];
2178 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2179};
2180
2181/* arguments passed to the mmp thread */
2182struct mmpd_data {
2183 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2184 struct super_block *sb; /* super block of the fs */
2185};
2186
2187/*
2188 * Check interval multiplier
2189 * The MMP block is written every update interval and initially checked every
2190 * update interval x the multiplier (the value is then adapted based on the
2191 * write latency). The reason is that writes can be delayed under load and we
2192 * don't want readers to incorrectly assume that the filesystem is no longer
2193 * in use.
2194 */
2195#define EXT4_MMP_CHECK_MULT 2UL
2196
2197/*
2198 * Minimum interval for MMP checking in seconds.
2199 */
2200#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2201
2202/*
2203 * Maximum interval for MMP checking in seconds.
2204 */
2205#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2206
2207/*
2208 * Function prototypes
2209 */
2210
2211/*
2212 * Ok, these declarations are also in <linux/kernel.h> but none of the
2213 * ext4 source programs needs to include it so they are duplicated here.
2214 */
2215# define NORET_TYPE /**/
2216# define ATTRIB_NORET __attribute__((noreturn))
2217# define NORET_AND noreturn,
2218
2219/* bitmap.c */
2220extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2221void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2222 struct ext4_group_desc *gdp,
2223 struct buffer_head *bh, int sz);
2224int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2225 struct ext4_group_desc *gdp,
2226 struct buffer_head *bh, int sz);
2227void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2228 struct ext4_group_desc *gdp,
2229 struct buffer_head *bh);
2230int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2231 struct ext4_group_desc *gdp,
2232 struct buffer_head *bh);
2233
2234/* balloc.c */
2235extern void ext4_get_group_no_and_offset(struct super_block *sb,
2236 ext4_fsblk_t blocknr,
2237 ext4_group_t *blockgrpp,
2238 ext4_grpblk_t *offsetp);
2239extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2240 ext4_fsblk_t block);
2241
2242extern unsigned int ext4_block_group(struct super_block *sb,
2243 ext4_fsblk_t blocknr);
2244extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2245 ext4_fsblk_t blocknr);
2246extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2247extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2248 ext4_group_t group);
2249extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2250 ext4_fsblk_t goal,
2251 unsigned int flags,
2252 unsigned long *count,
2253 int *errp);
2254extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2255 s64 nclusters, unsigned int flags);
2256extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2257extern void ext4_check_blocks_bitmap(struct super_block *);
2258extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2259 ext4_group_t block_group,
2260 struct buffer_head ** bh);
2261extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2262
2263extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2264 ext4_group_t block_group);
2265extern int ext4_wait_block_bitmap(struct super_block *sb,
2266 ext4_group_t block_group,
2267 struct buffer_head *bh);
2268extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2269 ext4_group_t block_group);
2270extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2271 ext4_group_t block_group,
2272 struct ext4_group_desc *gdp);
2273ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2274
2275static inline bool ext4_encrypted_inode(struct inode *inode)
2276{
2277 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
2278}
2279
2280#ifdef CONFIG_EXT4_FS_ENCRYPTION
2281static inline int ext4_fname_setup_filename(struct inode *dir,
2282 const struct qstr *iname,
2283 int lookup, struct ext4_filename *fname)
2284{
2285 struct fscrypt_name name;
2286 int err;
2287
2288 memset(fname, 0, sizeof(struct ext4_filename));
2289
2290 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2291
2292 fname->usr_fname = name.usr_fname;
2293 fname->disk_name = name.disk_name;
2294 fname->hinfo.hash = name.hash;
2295 fname->hinfo.minor_hash = name.minor_hash;
2296 fname->crypto_buf = name.crypto_buf;
2297 return err;
2298}
2299
2300static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2301{
2302 struct fscrypt_name name;
2303
2304 name.crypto_buf = fname->crypto_buf;
2305 fscrypt_free_filename(&name);
2306
2307 fname->crypto_buf.name = NULL;
2308 fname->usr_fname = NULL;
2309 fname->disk_name.name = NULL;
2310}
2311#else
2312static inline int ext4_fname_setup_filename(struct inode *dir,
2313 const struct qstr *iname,
2314 int lookup, struct ext4_filename *fname)
2315{
2316 fname->usr_fname = iname;
2317 fname->disk_name.name = (unsigned char *) iname->name;
2318 fname->disk_name.len = iname->len;
2319 return 0;
2320}
2321static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2322
2323#define fscrypt_set_d_op(i)
2324#define fscrypt_get_ctx fscrypt_notsupp_get_ctx
2325#define fscrypt_release_ctx fscrypt_notsupp_release_ctx
2326#define fscrypt_encrypt_page fscrypt_notsupp_encrypt_page
2327#define fscrypt_decrypt_page fscrypt_notsupp_decrypt_page
2328#define fscrypt_decrypt_bio_pages fscrypt_notsupp_decrypt_bio_pages
2329#define fscrypt_pullback_bio_page fscrypt_notsupp_pullback_bio_page
2330#define fscrypt_restore_control_page fscrypt_notsupp_restore_control_page
2331#define fscrypt_zeroout_range fscrypt_notsupp_zeroout_range
2332#define fscrypt_ioctl_set_policy fscrypt_notsupp_ioctl_set_policy
2333#define fscrypt_ioctl_get_policy fscrypt_notsupp_ioctl_get_policy
2334#define fscrypt_has_permitted_context fscrypt_notsupp_has_permitted_context
2335#define fscrypt_inherit_context fscrypt_notsupp_inherit_context
2336#define fscrypt_get_encryption_info fscrypt_notsupp_get_encryption_info
2337#define fscrypt_put_encryption_info fscrypt_notsupp_put_encryption_info
2338#define fscrypt_setup_filename fscrypt_notsupp_setup_filename
2339#define fscrypt_free_filename fscrypt_notsupp_free_filename
2340#define fscrypt_fname_encrypted_size fscrypt_notsupp_fname_encrypted_size
2341#define fscrypt_fname_alloc_buffer fscrypt_notsupp_fname_alloc_buffer
2342#define fscrypt_fname_free_buffer fscrypt_notsupp_fname_free_buffer
2343#define fscrypt_fname_disk_to_usr fscrypt_notsupp_fname_disk_to_usr
2344#define fscrypt_fname_usr_to_disk fscrypt_notsupp_fname_usr_to_disk
2345#endif
2346
2347/* dir.c */
2348extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2349 struct file *,
2350 struct ext4_dir_entry_2 *,
2351 struct buffer_head *, char *, int,
2352 unsigned int);
2353#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2354 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2355 (de), (bh), (buf), (size), (offset)))
2356extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2357 __u32 minor_hash,
2358 struct ext4_dir_entry_2 *dirent,
2359 struct fscrypt_str *ent_name);
2360extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2361extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2362 struct buffer_head *bh,
2363 void *buf, int buf_size,
2364 struct ext4_filename *fname,
2365 struct ext4_dir_entry_2 **dest_de);
2366int ext4_insert_dentry(struct inode *dir,
2367 struct inode *inode,
2368 struct ext4_dir_entry_2 *de,
2369 int buf_size,
2370 struct ext4_filename *fname);
2371static inline void ext4_update_dx_flag(struct inode *inode)
2372{
2373 if (!ext4_has_feature_dir_index(inode->i_sb))
2374 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2375}
2376static unsigned char ext4_filetype_table[] = {
2377 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2378};
2379
2380static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2381{
2382 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2383 return DT_UNKNOWN;
2384
2385 return ext4_filetype_table[filetype];
2386}
2387extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2388 void *buf, int buf_size);
2389
2390/* fsync.c */
2391extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2392
2393/* hash.c */
2394extern int ext4fs_dirhash(const char *name, int len, struct
2395 dx_hash_info *hinfo);
2396
2397/* ialloc.c */
2398extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2399 const struct qstr *qstr, __u32 goal,
2400 uid_t *owner, int handle_type,
2401 unsigned int line_no, int nblocks);
2402
2403#define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2404 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2405 0, 0, 0)
2406#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2407 type, nblocks) \
2408 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2409 (type), __LINE__, (nblocks))
2410
2411
2412extern void ext4_free_inode(handle_t *, struct inode *);
2413extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2414extern unsigned long ext4_count_free_inodes(struct super_block *);
2415extern unsigned long ext4_count_dirs(struct super_block *);
2416extern void ext4_check_inodes_bitmap(struct super_block *);
2417extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2418extern int ext4_init_inode_table(struct super_block *sb,
2419 ext4_group_t group, int barrier);
2420extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2421
2422/* mballoc.c */
2423extern const struct file_operations ext4_seq_mb_groups_fops;
2424extern long ext4_mb_stats;
2425extern long ext4_mb_max_to_scan;
2426extern int ext4_mb_init(struct super_block *);
2427extern int ext4_mb_release(struct super_block *);
2428extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2429 struct ext4_allocation_request *, int *);
2430extern int ext4_mb_reserve_blocks(struct super_block *, int);
2431extern void ext4_discard_preallocations(struct inode *);
2432extern int __init ext4_init_mballoc(void);
2433extern void ext4_exit_mballoc(void);
2434extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2435 struct buffer_head *bh, ext4_fsblk_t block,
2436 unsigned long count, int flags);
2437extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2438 ext4_group_t ngroups);
2439extern int ext4_mb_add_groupinfo(struct super_block *sb,
2440 ext4_group_t i, struct ext4_group_desc *desc);
2441extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2442 ext4_fsblk_t block, unsigned long count);
2443extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2444
2445/* inode.c */
2446int ext4_inode_is_fast_symlink(struct inode *inode);
2447struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2448struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2449int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2450 struct buffer_head *bh_result, int create);
2451int ext4_get_block(struct inode *inode, sector_t iblock,
2452 struct buffer_head *bh_result, int create);
2453int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2454 struct buffer_head *bh_result, int create);
2455int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2456 struct buffer_head *bh, int create);
2457int ext4_walk_page_buffers(handle_t *handle,
2458 struct buffer_head *head,
2459 unsigned from,
2460 unsigned to,
2461 int *partial,
2462 int (*fn)(handle_t *handle,
2463 struct buffer_head *bh));
2464int do_journal_get_write_access(handle_t *handle,
2465 struct buffer_head *bh);
2466#define FALL_BACK_TO_NONDELALLOC 1
2467#define CONVERT_INLINE_DATA 2
2468
2469extern struct inode *ext4_iget(struct super_block *, unsigned long);
2470extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2471extern int ext4_write_inode(struct inode *, struct writeback_control *);
2472extern int ext4_setattr(struct dentry *, struct iattr *);
2473extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2474 struct kstat *stat);
2475extern void ext4_evict_inode(struct inode *);
2476extern void ext4_clear_inode(struct inode *);
2477extern int ext4_sync_inode(handle_t *, struct inode *);
2478extern void ext4_dirty_inode(struct inode *, int);
2479extern int ext4_change_inode_journal_flag(struct inode *, int);
2480extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2481extern int ext4_inode_attach_jinode(struct inode *inode);
2482extern int ext4_can_truncate(struct inode *inode);
2483extern int ext4_truncate(struct inode *);
2484extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2485extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2486extern void ext4_set_inode_flags(struct inode *);
2487extern void ext4_get_inode_flags(struct ext4_inode_info *);
2488extern int ext4_alloc_da_blocks(struct inode *inode);
2489extern void ext4_set_aops(struct inode *inode);
2490extern int ext4_writepage_trans_blocks(struct inode *);
2491extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2492extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2493 loff_t lstart, loff_t lend);
2494extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2495extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
2496extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2497extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2498extern void ext4_da_update_reserve_space(struct inode *inode,
2499 int used, int quota_claim);
2500extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2501 ext4_fsblk_t pblk, ext4_lblk_t len);
2502extern int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
2503 unsigned int map_len,
2504 struct extent_status *result);
2505
2506/* indirect.c */
2507extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2508 struct ext4_map_blocks *map, int flags);
2509extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2510extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2511extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2512extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2513 ext4_lblk_t start, ext4_lblk_t end);
2514
2515/* ioctl.c */
2516extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2517extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2518
2519/* migrate.c */
2520extern int ext4_ext_migrate(struct inode *);
2521extern int ext4_ind_migrate(struct inode *inode);
2522
2523/* namei.c */
2524extern int ext4_dirent_csum_verify(struct inode *inode,
2525 struct ext4_dir_entry *dirent);
2526extern int ext4_orphan_add(handle_t *, struct inode *);
2527extern int ext4_orphan_del(handle_t *, struct inode *);
2528extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2529 __u32 start_minor_hash, __u32 *next_hash);
2530extern int ext4_search_dir(struct buffer_head *bh,
2531 char *search_buf,
2532 int buf_size,
2533 struct inode *dir,
2534 struct ext4_filename *fname,
2535 const struct qstr *d_name,
2536 unsigned int offset,
2537 struct ext4_dir_entry_2 **res_dir);
2538extern int ext4_generic_delete_entry(handle_t *handle,
2539 struct inode *dir,
2540 struct ext4_dir_entry_2 *de_del,
2541 struct buffer_head *bh,
2542 void *entry_buf,
2543 int buf_size,
2544 int csum_size);
2545extern bool ext4_empty_dir(struct inode *inode);
2546
2547/* resize.c */
2548extern int ext4_group_add(struct super_block *sb,
2549 struct ext4_new_group_data *input);
2550extern int ext4_group_extend(struct super_block *sb,
2551 struct ext4_super_block *es,
2552 ext4_fsblk_t n_blocks_count);
2553extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2554
2555/* super.c */
2556extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2557extern int ext4_calculate_overhead(struct super_block *sb);
2558extern void ext4_superblock_csum_set(struct super_block *sb);
2559extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2560extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2561extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2562 ext4_group_t ngroup);
2563extern const char *ext4_decode_error(struct super_block *sb, int errno,
2564 char nbuf[16]);
2565
2566extern __printf(4, 5)
2567void __ext4_error(struct super_block *, const char *, unsigned int,
2568 const char *, ...);
2569extern __printf(5, 6)
2570void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2571 const char *, ...);
2572extern __printf(5, 6)
2573void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2574 const char *, ...);
2575extern void __ext4_std_error(struct super_block *, const char *,
2576 unsigned int, int);
2577extern __printf(4, 5)
2578void __ext4_abort(struct super_block *, const char *, unsigned int,
2579 const char *, ...);
2580extern __printf(4, 5)
2581void __ext4_warning(struct super_block *, const char *, unsigned int,
2582 const char *, ...);
2583extern __printf(4, 5)
2584void __ext4_warning_inode(const struct inode *inode, const char *function,
2585 unsigned int line, const char *fmt, ...);
2586extern __printf(3, 4)
2587void __ext4_msg(struct super_block *, const char *, const char *, ...);
2588extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2589 const char *, unsigned int, const char *);
2590extern __printf(7, 8)
2591void __ext4_grp_locked_error(const char *, unsigned int,
2592 struct super_block *, ext4_group_t,
2593 unsigned long, ext4_fsblk_t,
2594 const char *, ...);
2595
2596#define EXT4_ERROR_INODE(inode, fmt, a...) \
2597 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2598
2599#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
2600 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2601
2602#define EXT4_ERROR_FILE(file, block, fmt, a...) \
2603 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2604
2605#ifdef CONFIG_PRINTK
2606
2607#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2608 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2609#define ext4_error_file(file, func, line, block, fmt, ...) \
2610 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2611#define ext4_error(sb, fmt, ...) \
2612 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2613#define ext4_abort(sb, fmt, ...) \
2614 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2615#define ext4_warning(sb, fmt, ...) \
2616 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2617#define ext4_warning_inode(inode, fmt, ...) \
2618 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2619#define ext4_msg(sb, level, fmt, ...) \
2620 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2621#define dump_mmp_msg(sb, mmp, msg) \
2622 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2623#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2624 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2625 fmt, ##__VA_ARGS__)
2626
2627#else
2628
2629#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2630do { \
2631 no_printk(fmt, ##__VA_ARGS__); \
2632 __ext4_error_inode(inode, "", 0, block, " "); \
2633} while (0)
2634#define ext4_error_file(file, func, line, block, fmt, ...) \
2635do { \
2636 no_printk(fmt, ##__VA_ARGS__); \
2637 __ext4_error_file(file, "", 0, block, " "); \
2638} while (0)
2639#define ext4_error(sb, fmt, ...) \
2640do { \
2641 no_printk(fmt, ##__VA_ARGS__); \
2642 __ext4_error(sb, "", 0, " "); \
2643} while (0)
2644#define ext4_abort(sb, fmt, ...) \
2645do { \
2646 no_printk(fmt, ##__VA_ARGS__); \
2647 __ext4_abort(sb, "", 0, " "); \
2648} while (0)
2649#define ext4_warning(sb, fmt, ...) \
2650do { \
2651 no_printk(fmt, ##__VA_ARGS__); \
2652 __ext4_warning(sb, "", 0, " "); \
2653} while (0)
2654#define ext4_warning_inode(inode, fmt, ...) \
2655do { \
2656 no_printk(fmt, ##__VA_ARGS__); \
2657 __ext4_warning_inode(inode, "", 0, " "); \
2658} while (0)
2659#define ext4_msg(sb, level, fmt, ...) \
2660do { \
2661 no_printk(fmt, ##__VA_ARGS__); \
2662 __ext4_msg(sb, "", " "); \
2663} while (0)
2664#define dump_mmp_msg(sb, mmp, msg) \
2665 __dump_mmp_msg(sb, mmp, "", 0, "")
2666#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2667do { \
2668 no_printk(fmt, ##__VA_ARGS__); \
2669 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2670} while (0)
2671
2672#endif
2673
2674extern void ext4_update_dynamic_rev(struct super_block *sb);
2675extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2676 __u32 compat);
2677extern int ext4_update_rocompat_feature(handle_t *handle,
2678 struct super_block *sb, __u32 rocompat);
2679extern int ext4_update_incompat_feature(handle_t *handle,
2680 struct super_block *sb, __u32 incompat);
2681extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2682 struct ext4_group_desc *bg);
2683extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2684 struct ext4_group_desc *bg);
2685extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2686 struct ext4_group_desc *bg);
2687extern __u32 ext4_free_group_clusters(struct super_block *sb,
2688 struct ext4_group_desc *bg);
2689extern __u32 ext4_free_inodes_count(struct super_block *sb,
2690 struct ext4_group_desc *bg);
2691extern __u32 ext4_used_dirs_count(struct super_block *sb,
2692 struct ext4_group_desc *bg);
2693extern __u32 ext4_itable_unused_count(struct super_block *sb,
2694 struct ext4_group_desc *bg);
2695extern void ext4_block_bitmap_set(struct super_block *sb,
2696 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2697extern void ext4_inode_bitmap_set(struct super_block *sb,
2698 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2699extern void ext4_inode_table_set(struct super_block *sb,
2700 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2701extern void ext4_free_group_clusters_set(struct super_block *sb,
2702 struct ext4_group_desc *bg,
2703 __u32 count);
2704extern void ext4_free_inodes_set(struct super_block *sb,
2705 struct ext4_group_desc *bg, __u32 count);
2706extern void ext4_used_dirs_set(struct super_block *sb,
2707 struct ext4_group_desc *bg, __u32 count);
2708extern void ext4_itable_unused_set(struct super_block *sb,
2709 struct ext4_group_desc *bg, __u32 count);
2710extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2711 struct ext4_group_desc *gdp);
2712extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2713 struct ext4_group_desc *gdp);
2714extern int ext4_register_li_request(struct super_block *sb,
2715 ext4_group_t first_not_zeroed);
2716
2717static inline int ext4_has_group_desc_csum(struct super_block *sb)
2718{
2719 return ext4_has_feature_gdt_csum(sb) ||
2720 EXT4_SB(sb)->s_chksum_driver != NULL;
2721}
2722
2723static inline int ext4_has_metadata_csum(struct super_block *sb)
2724{
2725 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2726 !EXT4_SB(sb)->s_chksum_driver);
2727
2728 return (EXT4_SB(sb)->s_chksum_driver != NULL);
2729}
2730static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2731{
2732 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2733 le32_to_cpu(es->s_blocks_count_lo);
2734}
2735
2736static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2737{
2738 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2739 le32_to_cpu(es->s_r_blocks_count_lo);
2740}
2741
2742static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2743{
2744 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2745 le32_to_cpu(es->s_free_blocks_count_lo);
2746}
2747
2748static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2749 ext4_fsblk_t blk)
2750{
2751 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2752 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2753}
2754
2755static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2756 ext4_fsblk_t blk)
2757{
2758 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2759 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2760}
2761
2762static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2763 ext4_fsblk_t blk)
2764{
2765 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2766 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2767}
2768
2769static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2770{
2771 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2772 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2773 le32_to_cpu(raw_inode->i_size_lo);
2774 else
2775 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2776}
2777
2778static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2779{
2780 raw_inode->i_size_lo = cpu_to_le32(i_size);
2781 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2782}
2783
2784static inline
2785struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2786 ext4_group_t group)
2787{
2788 struct ext4_group_info ***grp_info;
2789 long indexv, indexh;
2790 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2791 grp_info = EXT4_SB(sb)->s_group_info;
2792 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2793 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2794 return grp_info[indexv][indexh];
2795}
2796
2797/*
2798 * Reading s_groups_count requires using smp_rmb() afterwards. See
2799 * the locking protocol documented in the comments of ext4_group_add()
2800 * in resize.c
2801 */
2802static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2803{
2804 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2805
2806 smp_rmb();
2807 return ngroups;
2808}
2809
2810static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2811 ext4_group_t block_group)
2812{
2813 return block_group >> sbi->s_log_groups_per_flex;
2814}
2815
2816static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2817{
2818 return 1 << sbi->s_log_groups_per_flex;
2819}
2820
2821#define ext4_std_error(sb, errno) \
2822do { \
2823 if ((errno)) \
2824 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2825} while (0)
2826
2827#ifdef CONFIG_SMP
2828/* Each CPU can accumulate percpu_counter_batch clusters in their local
2829 * counters. So we need to make sure we have free clusters more
2830 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2831 */
2832#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2833#else
2834#define EXT4_FREECLUSTERS_WATERMARK 0
2835#endif
2836
2837/* Update i_disksize. Requires i_mutex to avoid races with truncate */
2838static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2839{
2840 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2841 !inode_is_locked(inode));
2842 down_write(&EXT4_I(inode)->i_data_sem);
2843 if (newsize > EXT4_I(inode)->i_disksize)
2844 EXT4_I(inode)->i_disksize = newsize;
2845 up_write(&EXT4_I(inode)->i_data_sem);
2846}
2847
2848/* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2849static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2850{
2851 int changed = 0;
2852
2853 if (newsize > inode->i_size) {
2854 i_size_write(inode, newsize);
2855 changed = 1;
2856 }
2857 if (newsize > EXT4_I(inode)->i_disksize) {
2858 ext4_update_i_disksize(inode, newsize);
2859 changed |= 2;
2860 }
2861 return changed;
2862}
2863
2864int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2865 loff_t len);
2866
2867struct ext4_group_info {
2868 unsigned long bb_state;
2869 struct rb_root bb_free_root;
2870 ext4_grpblk_t bb_first_free; /* first free block */
2871 ext4_grpblk_t bb_free; /* total free blocks */
2872 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2873 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2874 struct list_head bb_prealloc_list;
2875#ifdef DOUBLE_CHECK
2876 void *bb_bitmap;
2877#endif
2878 struct rw_semaphore alloc_sem;
2879 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2880 * regions, index is order.
2881 * bb_counters[3] = 5 means
2882 * 5 free 8-block regions. */
2883};
2884
2885#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2886#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2887#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2888#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2889
2890#define EXT4_MB_GRP_NEED_INIT(grp) \
2891 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2892#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2893 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2894#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2895 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2896
2897#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2898 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2899#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2900 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2901#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2902 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2903
2904#define EXT4_MAX_CONTENTION 8
2905#define EXT4_CONTENTION_THRESHOLD 2
2906
2907static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2908 ext4_group_t group)
2909{
2910 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2911}
2912
2913/*
2914 * Returns true if the filesystem is busy enough that attempts to
2915 * access the block group locks has run into contention.
2916 */
2917static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2918{
2919 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2920}
2921
2922static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2923{
2924 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2925 if (spin_trylock(lock))
2926 /*
2927 * We're able to grab the lock right away, so drop the
2928 * lock contention counter.
2929 */
2930 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2931 else {
2932 /*
2933 * The lock is busy, so bump the contention counter,
2934 * and then wait on the spin lock.
2935 */
2936 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2937 EXT4_MAX_CONTENTION);
2938 spin_lock(lock);
2939 }
2940}
2941
2942static inline void ext4_unlock_group(struct super_block *sb,
2943 ext4_group_t group)
2944{
2945 spin_unlock(ext4_group_lock_ptr(sb, group));
2946}
2947
2948/*
2949 * Block validity checking
2950 */
2951#define ext4_check_indirect_blockref(inode, bh) \
2952 ext4_check_blockref(__func__, __LINE__, inode, \
2953 (__le32 *)(bh)->b_data, \
2954 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2955
2956#define ext4_ind_check_inode(inode) \
2957 ext4_check_blockref(__func__, __LINE__, inode, \
2958 EXT4_I(inode)->i_data, \
2959 EXT4_NDIR_BLOCKS)
2960
2961/*
2962 * Inodes and files operations
2963 */
2964
2965/* dir.c */
2966extern const struct file_operations ext4_dir_operations;
2967
2968/* file.c */
2969extern const struct inode_operations ext4_file_inode_operations;
2970extern const struct file_operations ext4_file_operations;
2971extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2972
2973/* inline.c */
2974extern int ext4_get_max_inline_size(struct inode *inode);
2975extern int ext4_find_inline_data_nolock(struct inode *inode);
2976extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2977 unsigned int len);
2978extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2979
2980extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2981extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2982 struct inode *inode,
2983 loff_t pos, unsigned len,
2984 unsigned flags,
2985 struct page **pagep);
2986extern int ext4_write_inline_data_end(struct inode *inode,
2987 loff_t pos, unsigned len,
2988 unsigned copied,
2989 struct page *page);
2990extern struct buffer_head *
2991ext4_journalled_write_inline_data(struct inode *inode,
2992 unsigned len,
2993 struct page *page);
2994extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2995 struct inode *inode,
2996 loff_t pos, unsigned len,
2997 unsigned flags,
2998 struct page **pagep,
2999 void **fsdata);
3000extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3001 unsigned len, unsigned copied,
3002 struct page *page);
3003extern int ext4_try_add_inline_entry(handle_t *handle,
3004 struct ext4_filename *fname,
3005 struct inode *dir, struct inode *inode);
3006extern int ext4_try_create_inline_dir(handle_t *handle,
3007 struct inode *parent,
3008 struct inode *inode);
3009extern int ext4_read_inline_dir(struct file *filp,
3010 struct dir_context *ctx,
3011 int *has_inline_data);
3012extern int htree_inlinedir_to_tree(struct file *dir_file,
3013 struct inode *dir, ext4_lblk_t block,
3014 struct dx_hash_info *hinfo,
3015 __u32 start_hash, __u32 start_minor_hash,
3016 int *has_inline_data);
3017extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3018 struct ext4_filename *fname,
3019 const struct qstr *d_name,
3020 struct ext4_dir_entry_2 **res_dir,
3021 int *has_inline_data);
3022extern int ext4_delete_inline_entry(handle_t *handle,
3023 struct inode *dir,
3024 struct ext4_dir_entry_2 *de_del,
3025 struct buffer_head *bh,
3026 int *has_inline_data);
3027extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3028extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3029 struct ext4_dir_entry_2 **parent_de,
3030 int *retval);
3031extern int ext4_inline_data_fiemap(struct inode *inode,
3032 struct fiemap_extent_info *fieinfo,
3033 int *has_inline, __u64 start, __u64 len);
3034extern int ext4_try_to_evict_inline_data(handle_t *handle,
3035 struct inode *inode,
3036 int needed);
3037extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3038
3039extern int ext4_convert_inline_data(struct inode *inode);
3040
3041static inline int ext4_has_inline_data(struct inode *inode)
3042{
3043 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3044 EXT4_I(inode)->i_inline_off;
3045}
3046
3047/* namei.c */
3048extern const struct inode_operations ext4_dir_inode_operations;
3049extern const struct inode_operations ext4_special_inode_operations;
3050extern struct dentry *ext4_get_parent(struct dentry *child);
3051extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3052 struct ext4_dir_entry_2 *de,
3053 int blocksize, int csum_size,
3054 unsigned int parent_ino, int dotdot_real_len);
3055extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3056 unsigned int blocksize);
3057extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3058 struct inode *inode,
3059 struct buffer_head *bh);
3060#define S_SHIFT 12
3061static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3062 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3063 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3064 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3065 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3066 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3067 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3068 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3069};
3070
3071static inline void ext4_set_de_type(struct super_block *sb,
3072 struct ext4_dir_entry_2 *de,
3073 umode_t mode) {
3074 if (ext4_has_feature_filetype(sb))
3075 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3076}
3077
3078/* readpages.c */
3079extern int ext4_mpage_readpages(struct address_space *mapping,
3080 struct list_head *pages, struct page *page,
3081 unsigned nr_pages);
3082
3083/* symlink.c */
3084extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3085extern const struct inode_operations ext4_symlink_inode_operations;
3086extern const struct inode_operations ext4_fast_symlink_inode_operations;
3087
3088/* sysfs.c */
3089extern int ext4_register_sysfs(struct super_block *sb);
3090extern void ext4_unregister_sysfs(struct super_block *sb);
3091extern int __init ext4_init_sysfs(void);
3092extern void ext4_exit_sysfs(void);
3093
3094/* block_validity */
3095extern void ext4_release_system_zone(struct super_block *sb);
3096extern int ext4_setup_system_zone(struct super_block *sb);
3097extern int __init ext4_init_system_zone(void);
3098extern void ext4_exit_system_zone(void);
3099extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3100 ext4_fsblk_t start_blk,
3101 unsigned int count);
3102extern int ext4_check_blockref(const char *, unsigned int,
3103 struct inode *, __le32 *, unsigned int);
3104
3105/* extents.c */
3106struct ext4_ext_path;
3107struct ext4_extent;
3108
3109/*
3110 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3111 * __le32.
3112 */
3113#define EXT_MAX_BLOCKS 0xffffffff
3114
3115extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3116extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3117extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3118extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3119 struct ext4_map_blocks *map, int flags);
3120extern int ext4_ext_truncate(handle_t *, struct inode *);
3121extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3122 ext4_lblk_t end);
3123extern void ext4_ext_init(struct super_block *);
3124extern void ext4_ext_release(struct super_block *);
3125extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3126 loff_t len);
3127extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3128 loff_t offset, ssize_t len);
3129extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3130 struct ext4_map_blocks *map, int flags);
3131extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3132 ext4_lblk_t lblocks);
3133extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3134 int num,
3135 struct ext4_ext_path *path);
3136extern int ext4_can_extents_be_merged(struct inode *inode,
3137 struct ext4_extent *ex1,
3138 struct ext4_extent *ex2);
3139extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3140 struct ext4_ext_path **,
3141 struct ext4_extent *, int);
3142extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3143 struct ext4_ext_path **,
3144 int flags);
3145extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3146extern int ext4_ext_check_inode(struct inode *inode);
3147extern int ext4_find_delalloc_range(struct inode *inode,
3148 ext4_lblk_t lblk_start,
3149 ext4_lblk_t lblk_end);
3150extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3151extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3152extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3153 __u64 start, __u64 len);
3154extern int ext4_ext_precache(struct inode *inode);
3155extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3156extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3157extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3158 struct inode *inode2, ext4_lblk_t lblk1,
3159 ext4_lblk_t lblk2, ext4_lblk_t count,
3160 int mark_unwritten,int *err);
3161
3162/* move_extent.c */
3163extern void ext4_double_down_write_data_sem(struct inode *first,
3164 struct inode *second);
3165extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3166 struct inode *donor_inode);
3167extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3168 __u64 start_orig, __u64 start_donor,
3169 __u64 len, __u64 *moved_len);
3170
3171/* page-io.c */
3172extern int __init ext4_init_pageio(void);
3173extern void ext4_exit_pageio(void);
3174extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3175extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3176extern int ext4_put_io_end(ext4_io_end_t *io_end);
3177extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3178extern void ext4_io_submit_init(struct ext4_io_submit *io,
3179 struct writeback_control *wbc);
3180extern void ext4_end_io_rsv_work(struct work_struct *work);
3181extern void ext4_io_submit(struct ext4_io_submit *io);
3182extern int ext4_bio_write_page(struct ext4_io_submit *io,
3183 struct page *page,
3184 int len,
3185 struct writeback_control *wbc,
3186 bool keep_towrite);
3187
3188/* mmp.c */
3189extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3190
3191/*
3192 * Add new method to test whether block and inode bitmaps are properly
3193 * initialized. With uninit_bg reading the block from disk is not enough
3194 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3195 */
3196#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3197
3198static inline int bitmap_uptodate(struct buffer_head *bh)
3199{
3200 return (buffer_uptodate(bh) &&
3201 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3202}
3203static inline void set_bitmap_uptodate(struct buffer_head *bh)
3204{
3205 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3206}
3207
3208/*
3209 * Disable DIO read nolock optimization, so new dioreaders will be forced
3210 * to grab i_mutex
3211 */
3212static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3213{
3214 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3215 smp_mb();
3216}
3217static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3218{
3219 smp_mb();
3220 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3221}
3222
3223#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3224
3225/* For ioend & aio unwritten conversion wait queues */
3226#define EXT4_WQ_HASH_SZ 37
3227#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3228 EXT4_WQ_HASH_SZ])
3229extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3230
3231#define EXT4_RESIZING 0
3232extern int ext4_resize_begin(struct super_block *sb);
3233extern void ext4_resize_end(struct super_block *sb);
3234
3235static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3236 struct ext4_io_end *io_end)
3237{
3238 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3239 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3240 atomic_inc(&EXT4_I(inode)->i_unwritten);
3241 }
3242}
3243
3244static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3245{
3246 struct inode *inode = io_end->inode;
3247
3248 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3249 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3250 /* Wake up anyone waiting on unwritten extent conversion */
3251 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3252 wake_up_all(ext4_ioend_wq(inode));
3253 }
3254}
3255
3256extern struct iomap_ops ext4_iomap_ops;
3257
3258#endif /* __KERNEL__ */
3259
3260#define EFSBADCRC EBADMSG /* Bad CRC detected */
3261#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3262
3263#endif /* _EXT4_H */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ext4.h
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/include/linux/minix_fs.h
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 */
16
17#ifndef _EXT4_H
18#define _EXT4_H
19
20#include <linux/refcount.h>
21#include <linux/types.h>
22#include <linux/blkdev.h>
23#include <linux/magic.h>
24#include <linux/jbd2.h>
25#include <linux/quota.h>
26#include <linux/rwsem.h>
27#include <linux/rbtree.h>
28#include <linux/seqlock.h>
29#include <linux/mutex.h>
30#include <linux/timer.h>
31#include <linux/wait.h>
32#include <linux/sched/signal.h>
33#include <linux/blockgroup_lock.h>
34#include <linux/percpu_counter.h>
35#include <linux/ratelimit.h>
36#include <crypto/hash.h>
37#include <linux/falloc.h>
38#include <linux/percpu-rwsem.h>
39#include <linux/fiemap.h>
40#ifdef __KERNEL__
41#include <linux/compat.h>
42#endif
43
44#include <linux/fscrypt.h>
45#include <linux/fsverity.h>
46
47#include <linux/compiler.h>
48
49/*
50 * The fourth extended filesystem constants/structures
51 */
52
53/*
54 * with AGGRESSIVE_CHECK allocator runs consistency checks over
55 * structures. these checks slow things down a lot
56 */
57#define AGGRESSIVE_CHECK__
58
59/*
60 * with DOUBLE_CHECK defined mballoc creates persistent in-core
61 * bitmaps, maintains and uses them to check for double allocations
62 */
63#define DOUBLE_CHECK__
64
65/*
66 * Define EXT4FS_DEBUG to produce debug messages
67 */
68#undef EXT4FS_DEBUG
69
70/*
71 * Debug code
72 */
73#ifdef EXT4FS_DEBUG
74#define ext4_debug(f, a...) \
75 do { \
76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
77 __FILE__, __LINE__, __func__); \
78 printk(KERN_DEBUG f, ## a); \
79 } while (0)
80#else
81#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
82#endif
83
84 /*
85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
86 */
87#define EXT_DEBUG__
88
89/*
90 * Dynamic printk for controlled extents debugging.
91 */
92#ifdef CONFIG_EXT4_DEBUG
93#define ext_debug(ino, fmt, ...) \
94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
95 current->comm, task_pid_nr(current), \
96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
97 __func__, ##__VA_ARGS__)
98#else
99#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
100#endif
101
102#define ASSERT(assert) \
103do { \
104 if (unlikely(!(assert))) { \
105 printk(KERN_EMERG \
106 "Assertion failure in %s() at %s:%d: '%s'\n", \
107 __func__, __FILE__, __LINE__, #assert); \
108 BUG(); \
109 } \
110} while (0)
111
112/* data type for block offset of block group */
113typedef int ext4_grpblk_t;
114
115/* data type for filesystem-wide blocks number */
116typedef unsigned long long ext4_fsblk_t;
117
118/* data type for file logical block number */
119typedef __u32 ext4_lblk_t;
120
121/* data type for block group number */
122typedef unsigned int ext4_group_t;
123
124enum SHIFT_DIRECTION {
125 SHIFT_LEFT = 0,
126 SHIFT_RIGHT,
127};
128
129/*
130 * Flags used in mballoc's allocation_context flags field.
131 *
132 * Also used to show what's going on for debugging purposes when the
133 * flag field is exported via the traceport interface
134 */
135
136/* prefer goal again. length */
137#define EXT4_MB_HINT_MERGE 0x0001
138/* blocks already reserved */
139#define EXT4_MB_HINT_RESERVED 0x0002
140/* metadata is being allocated */
141#define EXT4_MB_HINT_METADATA 0x0004
142/* first blocks in the file */
143#define EXT4_MB_HINT_FIRST 0x0008
144/* search for the best chunk */
145#define EXT4_MB_HINT_BEST 0x0010
146/* data is being allocated */
147#define EXT4_MB_HINT_DATA 0x0020
148/* don't preallocate (for tails) */
149#define EXT4_MB_HINT_NOPREALLOC 0x0040
150/* allocate for locality group */
151#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
152/* allocate goal blocks or none */
153#define EXT4_MB_HINT_GOAL_ONLY 0x0100
154/* goal is meaningful */
155#define EXT4_MB_HINT_TRY_GOAL 0x0200
156/* blocks already pre-reserved by delayed allocation */
157#define EXT4_MB_DELALLOC_RESERVED 0x0400
158/* We are doing stream allocation */
159#define EXT4_MB_STREAM_ALLOC 0x0800
160/* Use reserved root blocks if needed */
161#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
162/* Use blocks from reserved pool */
163#define EXT4_MB_USE_RESERVED 0x2000
164/* Do strict check for free blocks while retrying block allocation */
165#define EXT4_MB_STRICT_CHECK 0x4000
166/* Large fragment size list lookup succeeded at least once for cr = 0 */
167#define EXT4_MB_CR0_OPTIMIZED 0x8000
168/* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
169#define EXT4_MB_CR1_OPTIMIZED 0x00010000
170struct ext4_allocation_request {
171 /* target inode for block we're allocating */
172 struct inode *inode;
173 /* how many blocks we want to allocate */
174 unsigned int len;
175 /* logical block in target inode */
176 ext4_lblk_t logical;
177 /* the closest logical allocated block to the left */
178 ext4_lblk_t lleft;
179 /* the closest logical allocated block to the right */
180 ext4_lblk_t lright;
181 /* phys. target (a hint) */
182 ext4_fsblk_t goal;
183 /* phys. block for the closest logical allocated block to the left */
184 ext4_fsblk_t pleft;
185 /* phys. block for the closest logical allocated block to the right */
186 ext4_fsblk_t pright;
187 /* flags. see above EXT4_MB_HINT_* */
188 unsigned int flags;
189};
190
191/*
192 * Logical to physical block mapping, used by ext4_map_blocks()
193 *
194 * This structure is used to pass requests into ext4_map_blocks() as
195 * well as to store the information returned by ext4_map_blocks(). It
196 * takes less room on the stack than a struct buffer_head.
197 */
198#define EXT4_MAP_NEW BIT(BH_New)
199#define EXT4_MAP_MAPPED BIT(BH_Mapped)
200#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
201#define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
202#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
203 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
204
205struct ext4_map_blocks {
206 ext4_fsblk_t m_pblk;
207 ext4_lblk_t m_lblk;
208 unsigned int m_len;
209 unsigned int m_flags;
210};
211
212/*
213 * Block validity checking, system zone rbtree.
214 */
215struct ext4_system_blocks {
216 struct rb_root root;
217 struct rcu_head rcu;
218};
219
220/*
221 * Flags for ext4_io_end->flags
222 */
223#define EXT4_IO_END_UNWRITTEN 0x0001
224
225struct ext4_io_end_vec {
226 struct list_head list; /* list of io_end_vec */
227 loff_t offset; /* offset in the file */
228 ssize_t size; /* size of the extent */
229};
230
231/*
232 * For converting unwritten extents on a work queue. 'handle' is used for
233 * buffered writeback.
234 */
235typedef struct ext4_io_end {
236 struct list_head list; /* per-file finished IO list */
237 handle_t *handle; /* handle reserved for extent
238 * conversion */
239 struct inode *inode; /* file being written to */
240 struct bio *bio; /* Linked list of completed
241 * bios covering the extent */
242 unsigned int flag; /* unwritten or not */
243 refcount_t count; /* reference counter */
244 struct list_head list_vec; /* list of ext4_io_end_vec */
245} ext4_io_end_t;
246
247struct ext4_io_submit {
248 struct writeback_control *io_wbc;
249 struct bio *io_bio;
250 ext4_io_end_t *io_end;
251 sector_t io_next_block;
252};
253
254/*
255 * Special inodes numbers
256 */
257#define EXT4_BAD_INO 1 /* Bad blocks inode */
258#define EXT4_ROOT_INO 2 /* Root inode */
259#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
260#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
261#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
262#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
263#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
264#define EXT4_JOURNAL_INO 8 /* Journal inode */
265
266/* First non-reserved inode for old ext4 filesystems */
267#define EXT4_GOOD_OLD_FIRST_INO 11
268
269/*
270 * Maximal count of links to a file
271 */
272#define EXT4_LINK_MAX 65000
273
274/*
275 * Macro-instructions used to manage several block sizes
276 */
277#define EXT4_MIN_BLOCK_SIZE 1024
278#define EXT4_MAX_BLOCK_SIZE 65536
279#define EXT4_MIN_BLOCK_LOG_SIZE 10
280#define EXT4_MAX_BLOCK_LOG_SIZE 16
281#define EXT4_MAX_CLUSTER_LOG_SIZE 30
282#ifdef __KERNEL__
283# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
284#else
285# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
286#endif
287#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
288#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
289 EXT4_SB(s)->s_cluster_bits)
290#ifdef __KERNEL__
291# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
292# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
293#else
294# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
295#endif
296#ifdef __KERNEL__
297#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
298#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
299#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
300#else
301#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
302 EXT4_GOOD_OLD_INODE_SIZE : \
303 (s)->s_inode_size)
304#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
305 EXT4_GOOD_OLD_FIRST_INO : \
306 (s)->s_first_ino)
307#endif
308#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
309#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
310 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
311 blkbits))
312
313/* Translate a block number to a cluster number */
314#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
315/* Translate a cluster number to a block number */
316#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
317/* Translate # of blks to # of clusters */
318#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
319 (sbi)->s_cluster_bits)
320/* Mask out the low bits to get the starting block of the cluster */
321#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
322 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
323#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
324 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
325/* Fill in the low bits to get the last block of the cluster */
326#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
327 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
328/* Get the cluster offset */
329#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
330 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
331#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
332 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
333
334/*
335 * Structure of a blocks group descriptor
336 */
337struct ext4_group_desc
338{
339 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
340 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
341 __le32 bg_inode_table_lo; /* Inodes table block */
342 __le16 bg_free_blocks_count_lo;/* Free blocks count */
343 __le16 bg_free_inodes_count_lo;/* Free inodes count */
344 __le16 bg_used_dirs_count_lo; /* Directories count */
345 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
346 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
347 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
348 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
349 __le16 bg_itable_unused_lo; /* Unused inodes count */
350 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
351 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
352 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
353 __le32 bg_inode_table_hi; /* Inodes table block MSB */
354 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
355 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
356 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
357 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
358 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
359 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
360 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
361 __u32 bg_reserved;
362};
363
364#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
365 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
366 sizeof(__le16))
367#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
368 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
369 sizeof(__le16))
370
371/*
372 * Structure of a flex block group info
373 */
374
375struct flex_groups {
376 atomic64_t free_clusters;
377 atomic_t free_inodes;
378 atomic_t used_dirs;
379};
380
381#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
382#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
383#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
384
385/*
386 * Macro-instructions used to manage group descriptors
387 */
388#define EXT4_MIN_DESC_SIZE 32
389#define EXT4_MIN_DESC_SIZE_64BIT 64
390#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
391#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
392#ifdef __KERNEL__
393# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
394# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
395# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
396# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
397# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
398#else
399# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
400# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
401# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
402#endif
403
404/*
405 * Constants relative to the data blocks
406 */
407#define EXT4_NDIR_BLOCKS 12
408#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
409#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
410#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
411#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
412
413/*
414 * Inode flags
415 */
416#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
417#define EXT4_UNRM_FL 0x00000002 /* Undelete */
418#define EXT4_COMPR_FL 0x00000004 /* Compress file */
419#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
420#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
421#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
422#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
423#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
424/* Reserved for compression usage... */
425#define EXT4_DIRTY_FL 0x00000100
426#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
427#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
428 /* nb: was previously EXT2_ECOMPR_FL */
429#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
430/* End compression flags --- maybe not all used */
431#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
432#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
433#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
434#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
435#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
436#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
437#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
438#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
439#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
440#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
441/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
442
443#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
444
445#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
446#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
447#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
448#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
449
450/* User modifiable flags */
451#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
452 EXT4_UNRM_FL | \
453 EXT4_COMPR_FL | \
454 EXT4_SYNC_FL | \
455 EXT4_IMMUTABLE_FL | \
456 EXT4_APPEND_FL | \
457 EXT4_NODUMP_FL | \
458 EXT4_NOATIME_FL | \
459 EXT4_JOURNAL_DATA_FL | \
460 EXT4_NOTAIL_FL | \
461 EXT4_DIRSYNC_FL | \
462 EXT4_TOPDIR_FL | \
463 EXT4_EXTENTS_FL | \
464 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
465 EXT4_DAX_FL | \
466 EXT4_PROJINHERIT_FL | \
467 EXT4_CASEFOLD_FL)
468
469/* User visible flags */
470#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
471 EXT4_DIRTY_FL | \
472 EXT4_COMPRBLK_FL | \
473 EXT4_NOCOMPR_FL | \
474 EXT4_ENCRYPT_FL | \
475 EXT4_INDEX_FL | \
476 EXT4_VERITY_FL | \
477 EXT4_INLINE_DATA_FL)
478
479/* Flags that should be inherited by new inodes from their parent. */
480#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
481 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
482 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
483 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
484 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
485 EXT4_DAX_FL)
486
487/* Flags that are appropriate for regular files (all but dir-specific ones). */
488#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
489 EXT4_PROJINHERIT_FL))
490
491/* Flags that are appropriate for non-directories/regular files. */
492#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
493
494/* The only flags that should be swapped */
495#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
496
497/* Flags which are mutually exclusive to DAX */
498#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
499 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
500
501/* Mask out flags that are inappropriate for the given type of inode. */
502static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
503{
504 if (S_ISDIR(mode))
505 return flags;
506 else if (S_ISREG(mode))
507 return flags & EXT4_REG_FLMASK;
508 else
509 return flags & EXT4_OTHER_FLMASK;
510}
511
512/*
513 * Inode flags used for atomic set/get
514 */
515enum {
516 EXT4_INODE_SECRM = 0, /* Secure deletion */
517 EXT4_INODE_UNRM = 1, /* Undelete */
518 EXT4_INODE_COMPR = 2, /* Compress file */
519 EXT4_INODE_SYNC = 3, /* Synchronous updates */
520 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
521 EXT4_INODE_APPEND = 5, /* writes to file may only append */
522 EXT4_INODE_NODUMP = 6, /* do not dump file */
523 EXT4_INODE_NOATIME = 7, /* do not update atime */
524/* Reserved for compression usage... */
525 EXT4_INODE_DIRTY = 8,
526 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
527 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
528 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
529/* End compression flags --- maybe not all used */
530 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
531 EXT4_INODE_IMAGIC = 13, /* AFS directory */
532 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
533 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
534 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
535 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
536 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
537 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
538 EXT4_INODE_VERITY = 20, /* Verity protected inode */
539 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
540/* 22 was formerly EXT4_INODE_EOFBLOCKS */
541 EXT4_INODE_DAX = 25, /* Inode is DAX */
542 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
543 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
544 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
545 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
546};
547
548/*
549 * Since it's pretty easy to mix up bit numbers and hex values, we use a
550 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
551 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
552 * any extra space in the compiled kernel image, otherwise, the build will fail.
553 * It's important that these values are the same, since we are using
554 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
555 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
556 * values found in ext2, ext3 and ext4 filesystems, and of course the values
557 * defined in e2fsprogs.
558 *
559 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
560 */
561#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
562#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
563
564static inline void ext4_check_flag_values(void)
565{
566 CHECK_FLAG_VALUE(SECRM);
567 CHECK_FLAG_VALUE(UNRM);
568 CHECK_FLAG_VALUE(COMPR);
569 CHECK_FLAG_VALUE(SYNC);
570 CHECK_FLAG_VALUE(IMMUTABLE);
571 CHECK_FLAG_VALUE(APPEND);
572 CHECK_FLAG_VALUE(NODUMP);
573 CHECK_FLAG_VALUE(NOATIME);
574 CHECK_FLAG_VALUE(DIRTY);
575 CHECK_FLAG_VALUE(COMPRBLK);
576 CHECK_FLAG_VALUE(NOCOMPR);
577 CHECK_FLAG_VALUE(ENCRYPT);
578 CHECK_FLAG_VALUE(INDEX);
579 CHECK_FLAG_VALUE(IMAGIC);
580 CHECK_FLAG_VALUE(JOURNAL_DATA);
581 CHECK_FLAG_VALUE(NOTAIL);
582 CHECK_FLAG_VALUE(DIRSYNC);
583 CHECK_FLAG_VALUE(TOPDIR);
584 CHECK_FLAG_VALUE(HUGE_FILE);
585 CHECK_FLAG_VALUE(EXTENTS);
586 CHECK_FLAG_VALUE(VERITY);
587 CHECK_FLAG_VALUE(EA_INODE);
588 CHECK_FLAG_VALUE(INLINE_DATA);
589 CHECK_FLAG_VALUE(PROJINHERIT);
590 CHECK_FLAG_VALUE(CASEFOLD);
591 CHECK_FLAG_VALUE(RESERVED);
592}
593
594/* Used to pass group descriptor data when online resize is done */
595struct ext4_new_group_input {
596 __u32 group; /* Group number for this data */
597 __u64 block_bitmap; /* Absolute block number of block bitmap */
598 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
599 __u64 inode_table; /* Absolute block number of inode table start */
600 __u32 blocks_count; /* Total number of blocks in this group */
601 __u16 reserved_blocks; /* Number of reserved blocks in this group */
602 __u16 unused;
603};
604
605#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
606struct compat_ext4_new_group_input {
607 u32 group;
608 compat_u64 block_bitmap;
609 compat_u64 inode_bitmap;
610 compat_u64 inode_table;
611 u32 blocks_count;
612 u16 reserved_blocks;
613 u16 unused;
614};
615#endif
616
617/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
618struct ext4_new_group_data {
619 __u32 group;
620 __u64 block_bitmap;
621 __u64 inode_bitmap;
622 __u64 inode_table;
623 __u32 blocks_count;
624 __u16 reserved_blocks;
625 __u16 mdata_blocks;
626 __u32 free_clusters_count;
627};
628
629/* Indexes used to index group tables in ext4_new_group_data */
630enum {
631 BLOCK_BITMAP = 0, /* block bitmap */
632 INODE_BITMAP, /* inode bitmap */
633 INODE_TABLE, /* inode tables */
634 GROUP_TABLE_COUNT,
635};
636
637/*
638 * Flags used by ext4_map_blocks()
639 */
640 /* Allocate any needed blocks and/or convert an unwritten
641 extent to be an initialized ext4 */
642#define EXT4_GET_BLOCKS_CREATE 0x0001
643 /* Request the creation of an unwritten extent */
644#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
645#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
646 EXT4_GET_BLOCKS_CREATE)
647 /* Caller is from the delayed allocation writeout path
648 * finally doing the actual allocation of delayed blocks */
649#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
650 /* caller is from the direct IO path, request to creation of an
651 unwritten extents if not allocated, split the unwritten
652 extent if blocks has been preallocated already*/
653#define EXT4_GET_BLOCKS_PRE_IO 0x0008
654#define EXT4_GET_BLOCKS_CONVERT 0x0010
655#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
656 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
657 /* Convert extent to initialized after IO complete */
658#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
659 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
660 /* Eventual metadata allocation (due to growing extent tree)
661 * should not fail, so try to use reserved blocks for that.*/
662#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
663 /* Don't normalize allocation size (used for fallocate) */
664#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
665 /* Convert written extents to unwritten */
666#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
667 /* Write zeros to newly created written extents */
668#define EXT4_GET_BLOCKS_ZERO 0x0200
669#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
670 EXT4_GET_BLOCKS_ZERO)
671 /* Caller will submit data before dropping transaction handle. This
672 * allows jbd2 to avoid submitting data before commit. */
673#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
674 /* Caller is in the atomic contex, find extent if it has been cached */
675#define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
676
677/*
678 * The bit position of these flags must not overlap with any of the
679 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
680 * read_extent_tree_block(), ext4_split_extent_at(),
681 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
682 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
683 * caching the extents when reading from the extent tree while a
684 * truncate or punch hole operation is in progress.
685 */
686#define EXT4_EX_NOCACHE 0x40000000
687#define EXT4_EX_FORCE_CACHE 0x20000000
688#define EXT4_EX_NOFAIL 0x10000000
689
690/*
691 * Flags used by ext4_free_blocks
692 */
693#define EXT4_FREE_BLOCKS_METADATA 0x0001
694#define EXT4_FREE_BLOCKS_FORGET 0x0002
695#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
696#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
697#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
698#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
699#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
700
701/*
702 * ioctl commands
703 */
704#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
705#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
706#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
707#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
708#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
709#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
710#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
711#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
712#define EXT4_IOC_MIGRATE _IO('f', 9)
713 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
714 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
715#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
716#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
717#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
718#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
719#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
720/* ioctl codes 19--39 are reserved for fscrypt */
721#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
722#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
723#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
724#define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32)
725#define EXT4_IOC_GETFSUUID _IOR('f', 44, struct fsuuid)
726#define EXT4_IOC_SETFSUUID _IOW('f', 44, struct fsuuid)
727
728#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
729
730/*
731 * Flags for going down operation
732 */
733#define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
734#define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
735#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
736
737/*
738 * Flags returned by EXT4_IOC_GETSTATE
739 *
740 * We only expose to userspace a subset of the state flags in
741 * i_state_flags
742 */
743#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
744#define EXT4_STATE_FLAG_NEW 0x00000002
745#define EXT4_STATE_FLAG_NEWENTRY 0x00000004
746#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
747
748/* flags for ioctl EXT4_IOC_CHECKPOINT */
749#define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1
750#define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2
751#define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4
752#define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
753 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
754 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
755
756/*
757 * Structure for EXT4_IOC_GETFSUUID/EXT4_IOC_SETFSUUID
758 */
759struct fsuuid {
760 __u32 fsu_len;
761 __u32 fsu_flags;
762 __u8 fsu_uuid[];
763};
764
765#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
766/*
767 * ioctl commands in 32 bit emulation
768 */
769#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
770#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
771#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
772#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
773#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
774#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
775#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
776#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
777#endif
778
779/*
780 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
781 * It indicates that the entry in extent status cache is for a hole.
782 */
783#define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
784
785/* Max physical block we can address w/o extents */
786#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
787
788/* Max logical block we can support */
789#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
790
791/*
792 * Structure of an inode on the disk
793 */
794struct ext4_inode {
795 __le16 i_mode; /* File mode */
796 __le16 i_uid; /* Low 16 bits of Owner Uid */
797 __le32 i_size_lo; /* Size in bytes */
798 __le32 i_atime; /* Access time */
799 __le32 i_ctime; /* Inode Change time */
800 __le32 i_mtime; /* Modification time */
801 __le32 i_dtime; /* Deletion Time */
802 __le16 i_gid; /* Low 16 bits of Group Id */
803 __le16 i_links_count; /* Links count */
804 __le32 i_blocks_lo; /* Blocks count */
805 __le32 i_flags; /* File flags */
806 union {
807 struct {
808 __le32 l_i_version;
809 } linux1;
810 struct {
811 __u32 h_i_translator;
812 } hurd1;
813 struct {
814 __u32 m_i_reserved1;
815 } masix1;
816 } osd1; /* OS dependent 1 */
817 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
818 __le32 i_generation; /* File version (for NFS) */
819 __le32 i_file_acl_lo; /* File ACL */
820 __le32 i_size_high;
821 __le32 i_obso_faddr; /* Obsoleted fragment address */
822 union {
823 struct {
824 __le16 l_i_blocks_high; /* were l_i_reserved1 */
825 __le16 l_i_file_acl_high;
826 __le16 l_i_uid_high; /* these 2 fields */
827 __le16 l_i_gid_high; /* were reserved2[0] */
828 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
829 __le16 l_i_reserved;
830 } linux2;
831 struct {
832 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
833 __u16 h_i_mode_high;
834 __u16 h_i_uid_high;
835 __u16 h_i_gid_high;
836 __u32 h_i_author;
837 } hurd2;
838 struct {
839 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
840 __le16 m_i_file_acl_high;
841 __u32 m_i_reserved2[2];
842 } masix2;
843 } osd2; /* OS dependent 2 */
844 __le16 i_extra_isize;
845 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
846 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
847 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
848 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
849 __le32 i_crtime; /* File Creation time */
850 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
851 __le32 i_version_hi; /* high 32 bits for 64-bit version */
852 __le32 i_projid; /* Project ID */
853};
854
855struct move_extent {
856 __u32 reserved; /* should be zero */
857 __u32 donor_fd; /* donor file descriptor */
858 __u64 orig_start; /* logical start offset in block for orig */
859 __u64 donor_start; /* logical start offset in block for donor */
860 __u64 len; /* block length to be moved */
861 __u64 moved_len; /* moved block length */
862};
863
864#define EXT4_EPOCH_BITS 2
865#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
866#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
867
868/*
869 * Extended fields will fit into an inode if the filesystem was formatted
870 * with large inodes (-I 256 or larger) and there are not currently any EAs
871 * consuming all of the available space. For new inodes we always reserve
872 * enough space for the kernel's known extended fields, but for inodes
873 * created with an old kernel this might not have been the case. None of
874 * the extended inode fields is critical for correct filesystem operation.
875 * This macro checks if a certain field fits in the inode. Note that
876 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
877 */
878#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
879 ((offsetof(typeof(*ext4_inode), field) + \
880 sizeof((ext4_inode)->field)) \
881 <= (EXT4_GOOD_OLD_INODE_SIZE + \
882 (einode)->i_extra_isize)) \
883
884/*
885 * We use an encoding that preserves the times for extra epoch "00":
886 *
887 * extra msb of adjust for signed
888 * epoch 32-bit 32-bit tv_sec to
889 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
890 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
891 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
892 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
893 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
894 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
895 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
896 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
897 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
898 *
899 * Note that previous versions of the kernel on 64-bit systems would
900 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
901 * 1970. e2fsck will correct this, assuming that it is run on the
902 * affected filesystem before 2242.
903 */
904
905static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
906{
907 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
908 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
909}
910
911static inline void ext4_decode_extra_time(struct timespec64 *time,
912 __le32 extra)
913{
914 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
915 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
916 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
917}
918
919#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
920do { \
921 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
922 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
923 (raw_inode)->xtime ## _extra = \
924 ext4_encode_extra_time(&(inode)->xtime); \
925 } \
926 else \
927 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
928} while (0)
929
930#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
931do { \
932 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
933 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
934 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
935 (raw_inode)->xtime ## _extra = \
936 ext4_encode_extra_time(&(einode)->xtime); \
937} while (0)
938
939#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
940do { \
941 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
942 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
943 ext4_decode_extra_time(&(inode)->xtime, \
944 raw_inode->xtime ## _extra); \
945 } \
946 else \
947 (inode)->xtime.tv_nsec = 0; \
948} while (0)
949
950
951#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
952do { \
953 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
954 (einode)->xtime.tv_sec = \
955 (signed)le32_to_cpu((raw_inode)->xtime); \
956 else \
957 (einode)->xtime.tv_sec = 0; \
958 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
959 ext4_decode_extra_time(&(einode)->xtime, \
960 raw_inode->xtime ## _extra); \
961 else \
962 (einode)->xtime.tv_nsec = 0; \
963} while (0)
964
965#define i_disk_version osd1.linux1.l_i_version
966
967#if defined(__KERNEL__) || defined(__linux__)
968#define i_reserved1 osd1.linux1.l_i_reserved1
969#define i_file_acl_high osd2.linux2.l_i_file_acl_high
970#define i_blocks_high osd2.linux2.l_i_blocks_high
971#define i_uid_low i_uid
972#define i_gid_low i_gid
973#define i_uid_high osd2.linux2.l_i_uid_high
974#define i_gid_high osd2.linux2.l_i_gid_high
975#define i_checksum_lo osd2.linux2.l_i_checksum_lo
976
977#elif defined(__GNU__)
978
979#define i_translator osd1.hurd1.h_i_translator
980#define i_uid_high osd2.hurd2.h_i_uid_high
981#define i_gid_high osd2.hurd2.h_i_gid_high
982#define i_author osd2.hurd2.h_i_author
983
984#elif defined(__masix__)
985
986#define i_reserved1 osd1.masix1.m_i_reserved1
987#define i_file_acl_high osd2.masix2.m_i_file_acl_high
988#define i_reserved2 osd2.masix2.m_i_reserved2
989
990#endif /* defined(__KERNEL__) || defined(__linux__) */
991
992#include "extents_status.h"
993#include "fast_commit.h"
994
995/*
996 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
997 *
998 * These are needed to avoid lockdep false positives when we need to
999 * allocate blocks to the quota inode during ext4_map_blocks(), while
1000 * holding i_data_sem for a normal (non-quota) inode. Since we don't
1001 * do quota tracking for the quota inode, this avoids deadlock (as
1002 * well as infinite recursion, since it isn't turtles all the way
1003 * down...)
1004 *
1005 * I_DATA_SEM_NORMAL - Used for most inodes
1006 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
1007 * where the second inode has larger inode number
1008 * than the first
1009 * I_DATA_SEM_QUOTA - Used for quota inodes only
1010 */
1011enum {
1012 I_DATA_SEM_NORMAL = 0,
1013 I_DATA_SEM_OTHER,
1014 I_DATA_SEM_QUOTA,
1015};
1016
1017
1018/*
1019 * fourth extended file system inode data in memory
1020 */
1021struct ext4_inode_info {
1022 __le32 i_data[15]; /* unconverted */
1023 __u32 i_dtime;
1024 ext4_fsblk_t i_file_acl;
1025
1026 /*
1027 * i_block_group is the number of the block group which contains
1028 * this file's inode. Constant across the lifetime of the inode,
1029 * it is used for making block allocation decisions - we try to
1030 * place a file's data blocks near its inode block, and new inodes
1031 * near to their parent directory's inode.
1032 */
1033 ext4_group_t i_block_group;
1034 ext4_lblk_t i_dir_start_lookup;
1035#if (BITS_PER_LONG < 64)
1036 unsigned long i_state_flags; /* Dynamic state flags */
1037#endif
1038 unsigned long i_flags;
1039
1040 /*
1041 * Extended attributes can be read independently of the main file
1042 * data. Taking i_rwsem even when reading would cause contention
1043 * between readers of EAs and writers of regular file data, so
1044 * instead we synchronize on xattr_sem when reading or changing
1045 * EAs.
1046 */
1047 struct rw_semaphore xattr_sem;
1048
1049 /*
1050 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1051 * i_orphan is used.
1052 */
1053 union {
1054 struct list_head i_orphan; /* unlinked but open inodes */
1055 unsigned int i_orphan_idx; /* Index in orphan file */
1056 };
1057
1058 /* Fast commit related info */
1059
1060 /* For tracking dentry create updates */
1061 struct list_head i_fc_dilist;
1062 struct list_head i_fc_list; /*
1063 * inodes that need fast commit
1064 * protected by sbi->s_fc_lock.
1065 */
1066
1067 /* Start of lblk range that needs to be committed in this fast commit */
1068 ext4_lblk_t i_fc_lblk_start;
1069
1070 /* End of lblk range that needs to be committed in this fast commit */
1071 ext4_lblk_t i_fc_lblk_len;
1072
1073 /* Number of ongoing updates on this inode */
1074 atomic_t i_fc_updates;
1075
1076 /* Fast commit wait queue for this inode */
1077 wait_queue_head_t i_fc_wait;
1078
1079 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1080 struct mutex i_fc_lock;
1081
1082 /*
1083 * i_disksize keeps track of what the inode size is ON DISK, not
1084 * in memory. During truncate, i_size is set to the new size by
1085 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1086 * set i_disksize to 0 until the truncate is actually under way.
1087 *
1088 * The intent is that i_disksize always represents the blocks which
1089 * are used by this file. This allows recovery to restart truncate
1090 * on orphans if we crash during truncate. We actually write i_disksize
1091 * into the on-disk inode when writing inodes out, instead of i_size.
1092 *
1093 * The only time when i_disksize and i_size may be different is when
1094 * a truncate is in progress. The only things which change i_disksize
1095 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1096 */
1097 loff_t i_disksize;
1098
1099 /*
1100 * i_data_sem is for serialising ext4_truncate() against
1101 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1102 * data tree are chopped off during truncate. We can't do that in
1103 * ext4 because whenever we perform intermediate commits during
1104 * truncate, the inode and all the metadata blocks *must* be in a
1105 * consistent state which allows truncation of the orphans to restart
1106 * during recovery. Hence we must fix the get_block-vs-truncate race
1107 * by other means, so we have i_data_sem.
1108 */
1109 struct rw_semaphore i_data_sem;
1110 struct inode vfs_inode;
1111 struct jbd2_inode *jinode;
1112
1113 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1114
1115 /*
1116 * File creation time. Its function is same as that of
1117 * struct timespec64 i_{a,c,m}time in the generic inode.
1118 */
1119 struct timespec64 i_crtime;
1120
1121 /* mballoc */
1122 atomic_t i_prealloc_active;
1123 struct list_head i_prealloc_list;
1124 spinlock_t i_prealloc_lock;
1125
1126 /* extents status tree */
1127 struct ext4_es_tree i_es_tree;
1128 rwlock_t i_es_lock;
1129 struct list_head i_es_list;
1130 unsigned int i_es_all_nr; /* protected by i_es_lock */
1131 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1132 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1133 extents to shrink. Protected by
1134 i_es_lock */
1135
1136 /* ialloc */
1137 ext4_group_t i_last_alloc_group;
1138
1139 /* allocation reservation info for delalloc */
1140 /* In case of bigalloc, this refer to clusters rather than blocks */
1141 unsigned int i_reserved_data_blocks;
1142
1143 /* pending cluster reservations for bigalloc file systems */
1144 struct ext4_pending_tree i_pending_tree;
1145
1146 /* on-disk additional length */
1147 __u16 i_extra_isize;
1148
1149 /* Indicate the inline data space. */
1150 u16 i_inline_off;
1151 u16 i_inline_size;
1152
1153#ifdef CONFIG_QUOTA
1154 /* quota space reservation, managed internally by quota code */
1155 qsize_t i_reserved_quota;
1156#endif
1157
1158 /* Lock protecting lists below */
1159 spinlock_t i_completed_io_lock;
1160 /*
1161 * Completed IOs that need unwritten extents handling and have
1162 * transaction reserved
1163 */
1164 struct list_head i_rsv_conversion_list;
1165 struct work_struct i_rsv_conversion_work;
1166 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1167
1168 spinlock_t i_block_reservation_lock;
1169
1170 /*
1171 * Transactions that contain inode's metadata needed to complete
1172 * fsync and fdatasync, respectively.
1173 */
1174 tid_t i_sync_tid;
1175 tid_t i_datasync_tid;
1176
1177#ifdef CONFIG_QUOTA
1178 struct dquot *i_dquot[MAXQUOTAS];
1179#endif
1180
1181 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1182 __u32 i_csum_seed;
1183
1184 kprojid_t i_projid;
1185};
1186
1187/*
1188 * File system states
1189 */
1190#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1191#define EXT4_ERROR_FS 0x0002 /* Errors detected */
1192#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1193#define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1194
1195/*
1196 * Misc. filesystem flags
1197 */
1198#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1199#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1200#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1201
1202/*
1203 * Mount flags set via mount options or defaults
1204 */
1205#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1206#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1207#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1208#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1209#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1210#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1211#define EXT4_MOUNT_ERRORS_MASK 0x00070
1212#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1213#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1214#ifdef CONFIG_FS_DAX
1215#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1216#else
1217#define EXT4_MOUNT_DAX_ALWAYS 0
1218#endif
1219#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1220#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1221#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1222#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1223#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1224#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1225#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1226#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1227#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1228#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1229#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1230#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1231 * enable enforcement for hidden
1232 * quota files */
1233#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1234 * enforcement for hidden quota
1235 * files */
1236#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1237 * enforcement */
1238#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1239#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1240#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1241#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1242#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1243#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1244#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1245#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1246#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1247#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1248
1249/*
1250 * Mount flags set either automatically (could not be set by mount option)
1251 * based on per file system feature or property or in special cases such as
1252 * distinguishing between explicit mount option definition and default.
1253 */
1254#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1255 specified delalloc */
1256#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1257 size of blocksize * 8
1258 blocks */
1259#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1260 file systems */
1261#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1262 specified journal checksum */
1263
1264#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1265#define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1266#define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1267#define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1268 * scanning in mballoc
1269 */
1270
1271#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1272 ~EXT4_MOUNT_##opt
1273#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1274 EXT4_MOUNT_##opt
1275#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1276 EXT4_MOUNT_##opt)
1277
1278#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1279 ~EXT4_MOUNT2_##opt
1280#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1281 EXT4_MOUNT2_##opt
1282#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1283 EXT4_MOUNT2_##opt)
1284
1285#define ext4_test_and_set_bit __test_and_set_bit_le
1286#define ext4_set_bit __set_bit_le
1287#define ext4_set_bit_atomic ext2_set_bit_atomic
1288#define ext4_test_and_clear_bit __test_and_clear_bit_le
1289#define ext4_clear_bit __clear_bit_le
1290#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1291#define ext4_test_bit test_bit_le
1292#define ext4_find_next_zero_bit find_next_zero_bit_le
1293#define ext4_find_next_bit find_next_bit_le
1294
1295extern void mb_set_bits(void *bm, int cur, int len);
1296
1297/*
1298 * Maximal mount counts between two filesystem checks
1299 */
1300#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1301#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1302
1303/*
1304 * Behaviour when detecting errors
1305 */
1306#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1307#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1308#define EXT4_ERRORS_PANIC 3 /* Panic */
1309#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1310
1311/* Metadata checksum algorithm codes */
1312#define EXT4_CRC32C_CHKSUM 1
1313
1314#define EXT4_LABEL_MAX 16
1315
1316/*
1317 * Structure of the super block
1318 */
1319struct ext4_super_block {
1320/*00*/ __le32 s_inodes_count; /* Inodes count */
1321 __le32 s_blocks_count_lo; /* Blocks count */
1322 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1323 __le32 s_free_blocks_count_lo; /* Free blocks count */
1324/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1325 __le32 s_first_data_block; /* First Data Block */
1326 __le32 s_log_block_size; /* Block size */
1327 __le32 s_log_cluster_size; /* Allocation cluster size */
1328/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1329 __le32 s_clusters_per_group; /* # Clusters per group */
1330 __le32 s_inodes_per_group; /* # Inodes per group */
1331 __le32 s_mtime; /* Mount time */
1332/*30*/ __le32 s_wtime; /* Write time */
1333 __le16 s_mnt_count; /* Mount count */
1334 __le16 s_max_mnt_count; /* Maximal mount count */
1335 __le16 s_magic; /* Magic signature */
1336 __le16 s_state; /* File system state */
1337 __le16 s_errors; /* Behaviour when detecting errors */
1338 __le16 s_minor_rev_level; /* minor revision level */
1339/*40*/ __le32 s_lastcheck; /* time of last check */
1340 __le32 s_checkinterval; /* max. time between checks */
1341 __le32 s_creator_os; /* OS */
1342 __le32 s_rev_level; /* Revision level */
1343/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1344 __le16 s_def_resgid; /* Default gid for reserved blocks */
1345 /*
1346 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1347 *
1348 * Note: the difference between the compatible feature set and
1349 * the incompatible feature set is that if there is a bit set
1350 * in the incompatible feature set that the kernel doesn't
1351 * know about, it should refuse to mount the filesystem.
1352 *
1353 * e2fsck's requirements are more strict; if it doesn't know
1354 * about a feature in either the compatible or incompatible
1355 * feature set, it must abort and not try to meddle with
1356 * things it doesn't understand...
1357 */
1358 __le32 s_first_ino; /* First non-reserved inode */
1359 __le16 s_inode_size; /* size of inode structure */
1360 __le16 s_block_group_nr; /* block group # of this superblock */
1361 __le32 s_feature_compat; /* compatible feature set */
1362/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1363 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1364/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1365/*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */
1366/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1367/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1368 /*
1369 * Performance hints. Directory preallocation should only
1370 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1371 */
1372 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1373 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1374 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1375 /*
1376 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1377 */
1378/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1379/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1380 __le32 s_journal_dev; /* device number of journal file */
1381 __le32 s_last_orphan; /* start of list of inodes to delete */
1382 __le32 s_hash_seed[4]; /* HTREE hash seed */
1383 __u8 s_def_hash_version; /* Default hash version to use */
1384 __u8 s_jnl_backup_type;
1385 __le16 s_desc_size; /* size of group descriptor */
1386/*100*/ __le32 s_default_mount_opts;
1387 __le32 s_first_meta_bg; /* First metablock block group */
1388 __le32 s_mkfs_time; /* When the filesystem was created */
1389 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1390 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1391/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1392 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1393 __le32 s_free_blocks_count_hi; /* Free blocks count */
1394 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1395 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1396 __le32 s_flags; /* Miscellaneous flags */
1397 __le16 s_raid_stride; /* RAID stride */
1398 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1399 __le64 s_mmp_block; /* Block for multi-mount protection */
1400 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1401 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1402 __u8 s_checksum_type; /* metadata checksum algorithm used */
1403 __u8 s_encryption_level; /* versioning level for encryption */
1404 __u8 s_reserved_pad; /* Padding to next 32bits */
1405 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1406 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1407 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1408 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1409 snapshot's future use */
1410 __le32 s_snapshot_list; /* inode number of the head of the
1411 on-disk snapshot list */
1412#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1413 __le32 s_error_count; /* number of fs errors */
1414 __le32 s_first_error_time; /* first time an error happened */
1415 __le32 s_first_error_ino; /* inode involved in first error */
1416 __le64 s_first_error_block; /* block involved of first error */
1417 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1418 __le32 s_first_error_line; /* line number where error happened */
1419 __le32 s_last_error_time; /* most recent time of an error */
1420 __le32 s_last_error_ino; /* inode involved in last error */
1421 __le32 s_last_error_line; /* line number where error happened */
1422 __le64 s_last_error_block; /* block involved of last error */
1423 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1424#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1425 __u8 s_mount_opts[64];
1426 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1427 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1428 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1429 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1430 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1431 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1432 __le32 s_lpf_ino; /* Location of the lost+found inode */
1433 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1434 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1435 __u8 s_wtime_hi;
1436 __u8 s_mtime_hi;
1437 __u8 s_mkfs_time_hi;
1438 __u8 s_lastcheck_hi;
1439 __u8 s_first_error_time_hi;
1440 __u8 s_last_error_time_hi;
1441 __u8 s_first_error_errcode;
1442 __u8 s_last_error_errcode;
1443 __le16 s_encoding; /* Filename charset encoding */
1444 __le16 s_encoding_flags; /* Filename charset encoding flags */
1445 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
1446 __le32 s_reserved[94]; /* Padding to the end of the block */
1447 __le32 s_checksum; /* crc32c(superblock) */
1448};
1449
1450#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1451
1452#ifdef __KERNEL__
1453
1454/* Number of quota types we support */
1455#define EXT4_MAXQUOTAS 3
1456
1457#define EXT4_ENC_UTF8_12_1 1
1458
1459/* Types of ext4 journal triggers */
1460enum ext4_journal_trigger_type {
1461 EXT4_JTR_ORPHAN_FILE,
1462 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
1463};
1464
1465#define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1466
1467struct ext4_journal_trigger {
1468 struct jbd2_buffer_trigger_type tr_triggers;
1469 struct super_block *sb;
1470};
1471
1472static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1473 struct jbd2_buffer_trigger_type *trigger)
1474{
1475 return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1476}
1477
1478#define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1479
1480/* Structure at the tail of orphan block */
1481struct ext4_orphan_block_tail {
1482 __le32 ob_magic;
1483 __le32 ob_checksum;
1484};
1485
1486static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1487{
1488 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1489 sizeof(u32);
1490}
1491
1492struct ext4_orphan_block {
1493 atomic_t ob_free_entries; /* Number of free orphan entries in block */
1494 struct buffer_head *ob_bh; /* Buffer for orphan block */
1495};
1496
1497/*
1498 * Info about orphan file.
1499 */
1500struct ext4_orphan_info {
1501 int of_blocks; /* Number of orphan blocks in a file */
1502 __u32 of_csum_seed; /* Checksum seed for orphan file */
1503 struct ext4_orphan_block *of_binfo; /* Array with info about orphan
1504 * file blocks */
1505};
1506
1507/*
1508 * fourth extended-fs super-block data in memory
1509 */
1510struct ext4_sb_info {
1511 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1512 unsigned long s_inodes_per_block;/* Number of inodes per block */
1513 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1514 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1515 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1516 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1517 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1518 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1519 ext4_group_t s_groups_count; /* Number of groups in the fs */
1520 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1521 unsigned long s_overhead; /* # of fs overhead clusters */
1522 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1523 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1524 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1525 struct buffer_head * s_sbh; /* Buffer containing the super block */
1526 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1527 struct buffer_head * __rcu *s_group_desc;
1528 unsigned int s_mount_opt;
1529 unsigned int s_mount_opt2;
1530 unsigned long s_mount_flags;
1531 unsigned int s_def_mount_opt;
1532 ext4_fsblk_t s_sb_block;
1533 atomic64_t s_resv_clusters;
1534 kuid_t s_resuid;
1535 kgid_t s_resgid;
1536 unsigned short s_mount_state;
1537 unsigned short s_pad;
1538 int s_addr_per_block_bits;
1539 int s_desc_per_block_bits;
1540 int s_inode_size;
1541 int s_first_ino;
1542 unsigned int s_inode_readahead_blks;
1543 unsigned int s_inode_goal;
1544 u32 s_hash_seed[4];
1545 int s_def_hash_version;
1546 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1547 struct percpu_counter s_freeclusters_counter;
1548 struct percpu_counter s_freeinodes_counter;
1549 struct percpu_counter s_dirs_counter;
1550 struct percpu_counter s_dirtyclusters_counter;
1551 struct percpu_counter s_sra_exceeded_retry_limit;
1552 struct blockgroup_lock *s_blockgroup_lock;
1553 struct proc_dir_entry *s_proc;
1554 struct kobject s_kobj;
1555 struct completion s_kobj_unregister;
1556 struct super_block *s_sb;
1557 struct buffer_head *s_mmp_bh;
1558
1559 /* Journaling */
1560 struct journal_s *s_journal;
1561 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1562 struct mutex s_orphan_lock; /* Protects on disk list changes */
1563 struct list_head s_orphan; /* List of orphaned inodes in on disk
1564 list */
1565 struct ext4_orphan_info s_orphan_info;
1566 unsigned long s_commit_interval;
1567 u32 s_max_batch_time;
1568 u32 s_min_batch_time;
1569 struct block_device *s_journal_bdev;
1570#ifdef CONFIG_QUOTA
1571 /* Names of quota files with journalled quota */
1572 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1573 int s_jquota_fmt; /* Format of quota to use */
1574#endif
1575 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1576 struct ext4_system_blocks __rcu *s_system_blks;
1577
1578#ifdef EXTENTS_STATS
1579 /* ext4 extents stats */
1580 unsigned long s_ext_min;
1581 unsigned long s_ext_max;
1582 unsigned long s_depth_max;
1583 spinlock_t s_ext_stats_lock;
1584 unsigned long s_ext_blocks;
1585 unsigned long s_ext_extents;
1586#endif
1587
1588 /* for buddy allocator */
1589 struct ext4_group_info ** __rcu *s_group_info;
1590 struct inode *s_buddy_cache;
1591 spinlock_t s_md_lock;
1592 unsigned short *s_mb_offsets;
1593 unsigned int *s_mb_maxs;
1594 unsigned int s_group_info_size;
1595 unsigned int s_mb_free_pending;
1596 struct list_head s_freed_data_list; /* List of blocks to be freed
1597 after commit completed */
1598 struct list_head s_discard_list;
1599 struct work_struct s_discard_work;
1600 atomic_t s_retry_alloc_pending;
1601 struct list_head *s_mb_avg_fragment_size;
1602 rwlock_t *s_mb_avg_fragment_size_locks;
1603 struct list_head *s_mb_largest_free_orders;
1604 rwlock_t *s_mb_largest_free_orders_locks;
1605
1606 /* tunables */
1607 unsigned long s_stripe;
1608 unsigned int s_mb_max_linear_groups;
1609 unsigned int s_mb_stream_request;
1610 unsigned int s_mb_max_to_scan;
1611 unsigned int s_mb_min_to_scan;
1612 unsigned int s_mb_stats;
1613 unsigned int s_mb_order2_reqs;
1614 unsigned int s_mb_group_prealloc;
1615 unsigned int s_mb_max_inode_prealloc;
1616 unsigned int s_max_dir_size_kb;
1617 /* where last allocation was done - for stream allocation */
1618 unsigned long s_mb_last_group;
1619 unsigned long s_mb_last_start;
1620 unsigned int s_mb_prefetch;
1621 unsigned int s_mb_prefetch_limit;
1622
1623 /* stats for buddy allocator */
1624 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1625 atomic_t s_bal_success; /* we found long enough chunks */
1626 atomic_t s_bal_allocated; /* in blocks */
1627 atomic_t s_bal_ex_scanned; /* total extents scanned */
1628 atomic_t s_bal_groups_scanned; /* number of groups scanned */
1629 atomic_t s_bal_goals; /* goal hits */
1630 atomic_t s_bal_breaks; /* too long searches */
1631 atomic_t s_bal_2orders; /* 2^order hits */
1632 atomic_t s_bal_cr0_bad_suggestions;
1633 atomic_t s_bal_cr1_bad_suggestions;
1634 atomic64_t s_bal_cX_groups_considered[4];
1635 atomic64_t s_bal_cX_hits[4];
1636 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */
1637 atomic_t s_mb_buddies_generated; /* number of buddies generated */
1638 atomic64_t s_mb_generation_time;
1639 atomic_t s_mb_lost_chunks;
1640 atomic_t s_mb_preallocated;
1641 atomic_t s_mb_discarded;
1642 atomic_t s_lock_busy;
1643
1644 /* locality groups */
1645 struct ext4_locality_group __percpu *s_locality_groups;
1646
1647 /* for write statistics */
1648 unsigned long s_sectors_written_start;
1649 u64 s_kbytes_written;
1650
1651 /* the size of zero-out chunk */
1652 unsigned int s_extent_max_zeroout_kb;
1653
1654 unsigned int s_log_groups_per_flex;
1655 struct flex_groups * __rcu *s_flex_groups;
1656 ext4_group_t s_flex_groups_allocated;
1657
1658 /* workqueue for reserved extent conversions (buffered io) */
1659 struct workqueue_struct *rsv_conversion_wq;
1660
1661 /* timer for periodic error stats printing */
1662 struct timer_list s_err_report;
1663
1664 /* Lazy inode table initialization info */
1665 struct ext4_li_request *s_li_request;
1666 /* Wait multiplier for lazy initialization thread */
1667 unsigned int s_li_wait_mult;
1668
1669 /* Kernel thread for multiple mount protection */
1670 struct task_struct *s_mmp_tsk;
1671
1672 /* record the last minlen when FITRIM is called. */
1673 unsigned long s_last_trim_minblks;
1674
1675 /* Reference to checksum algorithm driver via cryptoapi */
1676 struct crypto_shash *s_chksum_driver;
1677
1678 /* Precomputed FS UUID checksum for seeding other checksums */
1679 __u32 s_csum_seed;
1680
1681 /* Reclaim extents from extent status tree */
1682 struct shrinker s_es_shrinker;
1683 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1684 long s_es_nr_inode;
1685 struct ext4_es_stats s_es_stats;
1686 struct mb_cache *s_ea_block_cache;
1687 struct mb_cache *s_ea_inode_cache;
1688 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1689
1690 /* Journal triggers for checksum computation */
1691 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1692
1693 /* Ratelimit ext4 messages. */
1694 struct ratelimit_state s_err_ratelimit_state;
1695 struct ratelimit_state s_warning_ratelimit_state;
1696 struct ratelimit_state s_msg_ratelimit_state;
1697 atomic_t s_warning_count;
1698 atomic_t s_msg_count;
1699
1700 /* Encryption policy for '-o test_dummy_encryption' */
1701 struct fscrypt_dummy_policy s_dummy_enc_policy;
1702
1703 /*
1704 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1705 * or EXTENTS flag.
1706 */
1707 struct percpu_rw_semaphore s_writepages_rwsem;
1708 struct dax_device *s_daxdev;
1709 u64 s_dax_part_off;
1710#ifdef CONFIG_EXT4_DEBUG
1711 unsigned long s_simulate_fail;
1712#endif
1713 /* Record the errseq of the backing block device */
1714 errseq_t s_bdev_wb_err;
1715 spinlock_t s_bdev_wb_lock;
1716
1717 /* Information about errors that happened during this mount */
1718 spinlock_t s_error_lock;
1719 int s_add_error_count;
1720 int s_first_error_code;
1721 __u32 s_first_error_line;
1722 __u32 s_first_error_ino;
1723 __u64 s_first_error_block;
1724 const char *s_first_error_func;
1725 time64_t s_first_error_time;
1726 int s_last_error_code;
1727 __u32 s_last_error_line;
1728 __u32 s_last_error_ino;
1729 __u64 s_last_error_block;
1730 const char *s_last_error_func;
1731 time64_t s_last_error_time;
1732 /*
1733 * If we are in a context where we cannot update error information in
1734 * the on-disk superblock, we queue this work to do it.
1735 */
1736 struct work_struct s_error_work;
1737
1738 /* Ext4 fast commit sub transaction ID */
1739 atomic_t s_fc_subtid;
1740
1741 /*
1742 * After commit starts, the main queue gets locked, and the further
1743 * updates get added in the staging queue.
1744 */
1745#define FC_Q_MAIN 0
1746#define FC_Q_STAGING 1
1747 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1748 * that have data changes in them.
1749 */
1750 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1751 unsigned int s_fc_bytes;
1752 /*
1753 * Main fast commit lock. This lock protects accesses to the
1754 * following fields:
1755 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1756 */
1757 spinlock_t s_fc_lock;
1758 struct buffer_head *s_fc_bh;
1759 struct ext4_fc_stats s_fc_stats;
1760 tid_t s_fc_ineligible_tid;
1761#ifdef CONFIG_EXT4_DEBUG
1762 int s_fc_debug_max_replay;
1763#endif
1764 struct ext4_fc_replay_state s_fc_replay_state;
1765};
1766
1767static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1768{
1769 return sb->s_fs_info;
1770}
1771static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1772{
1773 return container_of(inode, struct ext4_inode_info, vfs_inode);
1774}
1775
1776static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1777{
1778 return ino == EXT4_ROOT_INO ||
1779 (ino >= EXT4_FIRST_INO(sb) &&
1780 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1781}
1782
1783/*
1784 * Returns: sbi->field[index]
1785 * Used to access an array element from the following sbi fields which require
1786 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1787 * - s_group_desc
1788 * - s_group_info
1789 * - s_flex_group
1790 */
1791#define sbi_array_rcu_deref(sbi, field, index) \
1792({ \
1793 typeof(*((sbi)->field)) _v; \
1794 rcu_read_lock(); \
1795 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1796 rcu_read_unlock(); \
1797 _v; \
1798})
1799
1800/*
1801 * run-time mount flags
1802 */
1803enum {
1804 EXT4_MF_MNTDIR_SAMPLED,
1805 EXT4_MF_FS_ABORTED, /* Fatal error detected */
1806 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */
1807};
1808
1809static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1810{
1811 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1812}
1813
1814static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1815{
1816 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1817}
1818
1819static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1820{
1821 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1822}
1823
1824
1825/*
1826 * Simulate_fail codes
1827 */
1828#define EXT4_SIM_BBITMAP_EIO 1
1829#define EXT4_SIM_BBITMAP_CRC 2
1830#define EXT4_SIM_IBITMAP_EIO 3
1831#define EXT4_SIM_IBITMAP_CRC 4
1832#define EXT4_SIM_INODE_EIO 5
1833#define EXT4_SIM_INODE_CRC 6
1834#define EXT4_SIM_DIRBLOCK_EIO 7
1835#define EXT4_SIM_DIRBLOCK_CRC 8
1836
1837static inline bool ext4_simulate_fail(struct super_block *sb,
1838 unsigned long code)
1839{
1840#ifdef CONFIG_EXT4_DEBUG
1841 struct ext4_sb_info *sbi = EXT4_SB(sb);
1842
1843 if (unlikely(sbi->s_simulate_fail == code)) {
1844 sbi->s_simulate_fail = 0;
1845 return true;
1846 }
1847#endif
1848 return false;
1849}
1850
1851static inline void ext4_simulate_fail_bh(struct super_block *sb,
1852 struct buffer_head *bh,
1853 unsigned long code)
1854{
1855 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1856 clear_buffer_uptodate(bh);
1857}
1858
1859/*
1860 * Error number codes for s_{first,last}_error_errno
1861 *
1862 * Linux errno numbers are architecture specific, so we need to translate
1863 * them into something which is architecture independent. We don't define
1864 * codes for all errno's; just the ones which are most likely to be the cause
1865 * of an ext4_error() call.
1866 */
1867#define EXT4_ERR_UNKNOWN 1
1868#define EXT4_ERR_EIO 2
1869#define EXT4_ERR_ENOMEM 3
1870#define EXT4_ERR_EFSBADCRC 4
1871#define EXT4_ERR_EFSCORRUPTED 5
1872#define EXT4_ERR_ENOSPC 6
1873#define EXT4_ERR_ENOKEY 7
1874#define EXT4_ERR_EROFS 8
1875#define EXT4_ERR_EFBIG 9
1876#define EXT4_ERR_EEXIST 10
1877#define EXT4_ERR_ERANGE 11
1878#define EXT4_ERR_EOVERFLOW 12
1879#define EXT4_ERR_EBUSY 13
1880#define EXT4_ERR_ENOTDIR 14
1881#define EXT4_ERR_ENOTEMPTY 15
1882#define EXT4_ERR_ESHUTDOWN 16
1883#define EXT4_ERR_EFAULT 17
1884
1885/*
1886 * Inode dynamic state flags
1887 */
1888enum {
1889 EXT4_STATE_JDATA, /* journaled data exists */
1890 EXT4_STATE_NEW, /* inode is newly created */
1891 EXT4_STATE_XATTR, /* has in-inode xattrs */
1892 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1893 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1894 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1895 EXT4_STATE_NEWENTRY, /* File just added to dir */
1896 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1897 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1898 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1899 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1900 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1901 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
1902};
1903
1904#define EXT4_INODE_BIT_FNS(name, field, offset) \
1905static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1906{ \
1907 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1908} \
1909static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1910{ \
1911 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1912} \
1913static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1914{ \
1915 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1916}
1917
1918/* Add these declarations here only so that these functions can be
1919 * found by name. Otherwise, they are very hard to locate. */
1920static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1921static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1922static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1923EXT4_INODE_BIT_FNS(flag, flags, 0)
1924
1925/* Add these declarations here only so that these functions can be
1926 * found by name. Otherwise, they are very hard to locate. */
1927static inline int ext4_test_inode_state(struct inode *inode, int bit);
1928static inline void ext4_set_inode_state(struct inode *inode, int bit);
1929static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1930#if (BITS_PER_LONG < 64)
1931EXT4_INODE_BIT_FNS(state, state_flags, 0)
1932
1933static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1934{
1935 (ei)->i_state_flags = 0;
1936}
1937#else
1938EXT4_INODE_BIT_FNS(state, flags, 32)
1939
1940static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1941{
1942 /* We depend on the fact that callers will set i_flags */
1943}
1944#endif
1945#else
1946/* Assume that user mode programs are passing in an ext4fs superblock, not
1947 * a kernel struct super_block. This will allow us to call the feature-test
1948 * macros from user land. */
1949#define EXT4_SB(sb) (sb)
1950#endif
1951
1952static inline bool ext4_verity_in_progress(struct inode *inode)
1953{
1954 return IS_ENABLED(CONFIG_FS_VERITY) &&
1955 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1956}
1957
1958#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1959
1960/*
1961 * Codes for operating systems
1962 */
1963#define EXT4_OS_LINUX 0
1964#define EXT4_OS_HURD 1
1965#define EXT4_OS_MASIX 2
1966#define EXT4_OS_FREEBSD 3
1967#define EXT4_OS_LITES 4
1968
1969/*
1970 * Revision levels
1971 */
1972#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1973#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1974
1975#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1976
1977#define EXT4_GOOD_OLD_INODE_SIZE 128
1978
1979#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1980#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1981#define EXT4_TIMESTAMP_MIN S32_MIN
1982
1983/*
1984 * Feature set definitions
1985 */
1986
1987#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1988#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1989#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1990#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1991#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1992#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1993#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1994/*
1995 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1996 * incompatible only if fast commit blocks are present in the FS. Since we
1997 * clear the journal (and thus the fast commit blocks), we don't mark FS as
1998 * incompatible. We also have a JBD2 incompat feature, which gets set when
1999 * there are fast commit blocks present in the journal.
2000 */
2001#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
2002#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
2003#define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
2004
2005#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
2006#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
2007#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
2008#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
2009#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
2010#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
2011#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
2012#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
2013#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
2014/*
2015 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
2016 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2017 * all other data structures' checksums. However, the METADATA_CSUM and
2018 * GDT_CSUM bits are mutually exclusive.
2019 */
2020#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
2021#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
2022#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
2023#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
2024#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be
2025 non-empty */
2026
2027#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
2028#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
2029#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
2030#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
2031#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
2032#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
2033#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
2034#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
2035#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
2036#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
2037#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
2038#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
2039#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
2040#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
2041#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
2042#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
2043
2044extern void ext4_update_dynamic_rev(struct super_block *sb);
2045
2046#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2047static inline bool ext4_has_feature_##name(struct super_block *sb) \
2048{ \
2049 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2050 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2051} \
2052static inline void ext4_set_feature_##name(struct super_block *sb) \
2053{ \
2054 ext4_update_dynamic_rev(sb); \
2055 EXT4_SB(sb)->s_es->s_feature_compat |= \
2056 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2057} \
2058static inline void ext4_clear_feature_##name(struct super_block *sb) \
2059{ \
2060 EXT4_SB(sb)->s_es->s_feature_compat &= \
2061 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2062}
2063
2064#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2065static inline bool ext4_has_feature_##name(struct super_block *sb) \
2066{ \
2067 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2068 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2069} \
2070static inline void ext4_set_feature_##name(struct super_block *sb) \
2071{ \
2072 ext4_update_dynamic_rev(sb); \
2073 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2074 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2075} \
2076static inline void ext4_clear_feature_##name(struct super_block *sb) \
2077{ \
2078 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2079 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2080}
2081
2082#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2083static inline bool ext4_has_feature_##name(struct super_block *sb) \
2084{ \
2085 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2086 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2087} \
2088static inline void ext4_set_feature_##name(struct super_block *sb) \
2089{ \
2090 ext4_update_dynamic_rev(sb); \
2091 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2092 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2093} \
2094static inline void ext4_clear_feature_##name(struct super_block *sb) \
2095{ \
2096 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2097 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2098}
2099
2100EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2101EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2102EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2103EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2104EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2105EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2106EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2107EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2108EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2109EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
2110
2111EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2112EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2113EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2114EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2115EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2116EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2117EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2118EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2119EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2120EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2121EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2122EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2123EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2124EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
2125
2126EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2127EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2128EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2129EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2130EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2131EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2132EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2133EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2134EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2135EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2136EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2137EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2138EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2139EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2140EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2141EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2142
2143#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2144#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2145 EXT4_FEATURE_INCOMPAT_META_BG)
2146#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2147 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2148 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2149
2150#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2151#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2152 EXT4_FEATURE_INCOMPAT_RECOVER| \
2153 EXT4_FEATURE_INCOMPAT_META_BG)
2154#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2155 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2156 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2157
2158#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2159 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2160#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2161 EXT4_FEATURE_INCOMPAT_RECOVER| \
2162 EXT4_FEATURE_INCOMPAT_META_BG| \
2163 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2164 EXT4_FEATURE_INCOMPAT_64BIT| \
2165 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2166 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2167 EXT4_FEATURE_INCOMPAT_MMP | \
2168 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2169 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2170 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2171 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2172 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2173#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2174 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2175 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2176 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2177 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2178 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2179 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2180 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2181 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2182 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2183 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2184 EXT4_FEATURE_RO_COMPAT_VERITY |\
2185 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2186
2187#define EXTN_FEATURE_FUNCS(ver) \
2188static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2189{ \
2190 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2191 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2192} \
2193static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2194{ \
2195 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2196 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2197} \
2198static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2199{ \
2200 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2201 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2202}
2203
2204EXTN_FEATURE_FUNCS(2)
2205EXTN_FEATURE_FUNCS(3)
2206EXTN_FEATURE_FUNCS(4)
2207
2208static inline bool ext4_has_compat_features(struct super_block *sb)
2209{
2210 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2211}
2212static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2213{
2214 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2215}
2216static inline bool ext4_has_incompat_features(struct super_block *sb)
2217{
2218 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2219}
2220
2221extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2222
2223/*
2224 * Superblock flags
2225 */
2226#define EXT4_FLAGS_RESIZING 0
2227#define EXT4_FLAGS_SHUTDOWN 1
2228#define EXT4_FLAGS_BDEV_IS_DAX 2
2229
2230static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2231{
2232 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2233}
2234
2235/*
2236 * Default values for user and/or group using reserved blocks
2237 */
2238#define EXT4_DEF_RESUID 0
2239#define EXT4_DEF_RESGID 0
2240
2241/*
2242 * Default project ID
2243 */
2244#define EXT4_DEF_PROJID 0
2245
2246#define EXT4_DEF_INODE_READAHEAD_BLKS 32
2247
2248/*
2249 * Default mount options
2250 */
2251#define EXT4_DEFM_DEBUG 0x0001
2252#define EXT4_DEFM_BSDGROUPS 0x0002
2253#define EXT4_DEFM_XATTR_USER 0x0004
2254#define EXT4_DEFM_ACL 0x0008
2255#define EXT4_DEFM_UID16 0x0010
2256#define EXT4_DEFM_JMODE 0x0060
2257#define EXT4_DEFM_JMODE_DATA 0x0020
2258#define EXT4_DEFM_JMODE_ORDERED 0x0040
2259#define EXT4_DEFM_JMODE_WBACK 0x0060
2260#define EXT4_DEFM_NOBARRIER 0x0100
2261#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2262#define EXT4_DEFM_DISCARD 0x0400
2263#define EXT4_DEFM_NODELALLOC 0x0800
2264
2265/*
2266 * Default journal batch times
2267 */
2268#define EXT4_DEF_MIN_BATCH_TIME 0
2269#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2270
2271/*
2272 * Minimum number of groups in a flexgroup before we separate out
2273 * directories into the first block group of a flexgroup
2274 */
2275#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2276
2277/*
2278 * Structure of a directory entry
2279 */
2280#define EXT4_NAME_LEN 255
2281/*
2282 * Base length of the ext4 directory entry excluding the name length
2283 */
2284#define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2285
2286struct ext4_dir_entry {
2287 __le32 inode; /* Inode number */
2288 __le16 rec_len; /* Directory entry length */
2289 __le16 name_len; /* Name length */
2290 char name[EXT4_NAME_LEN]; /* File name */
2291};
2292
2293
2294/*
2295 * Encrypted Casefolded entries require saving the hash on disk. This structure
2296 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2297 * boundary.
2298 */
2299struct ext4_dir_entry_hash {
2300 __le32 hash;
2301 __le32 minor_hash;
2302};
2303
2304/*
2305 * The new version of the directory entry. Since EXT4 structures are
2306 * stored in intel byte order, and the name_len field could never be
2307 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2308 * file_type field.
2309 */
2310struct ext4_dir_entry_2 {
2311 __le32 inode; /* Inode number */
2312 __le16 rec_len; /* Directory entry length */
2313 __u8 name_len; /* Name length */
2314 __u8 file_type; /* See file type macros EXT4_FT_* below */
2315 char name[EXT4_NAME_LEN]; /* File name */
2316};
2317
2318/*
2319 * Access the hashes at the end of ext4_dir_entry_2
2320 */
2321#define EXT4_DIRENT_HASHES(entry) \
2322 ((struct ext4_dir_entry_hash *) \
2323 (((void *)(entry)) + \
2324 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2325#define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2326#define EXT4_DIRENT_MINOR_HASH(entry) \
2327 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2328
2329static inline bool ext4_hash_in_dirent(const struct inode *inode)
2330{
2331 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2332}
2333
2334/*
2335 * This is a bogus directory entry at the end of each leaf block that
2336 * records checksums.
2337 */
2338struct ext4_dir_entry_tail {
2339 __le32 det_reserved_zero1; /* Pretend to be unused */
2340 __le16 det_rec_len; /* 12 */
2341 __u8 det_reserved_zero2; /* Zero name length */
2342 __u8 det_reserved_ft; /* 0xDE, fake file type */
2343 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2344};
2345
2346#define EXT4_DIRENT_TAIL(block, blocksize) \
2347 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2348 ((blocksize) - \
2349 sizeof(struct ext4_dir_entry_tail))))
2350
2351/*
2352 * Ext4 directory file types. Only the low 3 bits are used. The
2353 * other bits are reserved for now.
2354 */
2355#define EXT4_FT_UNKNOWN 0
2356#define EXT4_FT_REG_FILE 1
2357#define EXT4_FT_DIR 2
2358#define EXT4_FT_CHRDEV 3
2359#define EXT4_FT_BLKDEV 4
2360#define EXT4_FT_FIFO 5
2361#define EXT4_FT_SOCK 6
2362#define EXT4_FT_SYMLINK 7
2363
2364#define EXT4_FT_MAX 8
2365
2366#define EXT4_FT_DIR_CSUM 0xDE
2367
2368/*
2369 * EXT4_DIR_PAD defines the directory entries boundaries
2370 *
2371 * NOTE: It must be a multiple of 4
2372 */
2373#define EXT4_DIR_PAD 4
2374#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2375#define EXT4_MAX_REC_LEN ((1<<16)-1)
2376
2377/*
2378 * The rec_len is dependent on the type of directory. Directories that are
2379 * casefolded and encrypted need to store the hash as well, so we add room for
2380 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2381 * pass NULL for dir, as those entries do not use the extra fields.
2382 */
2383static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2384 const struct inode *dir)
2385{
2386 int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2387
2388 if (dir && ext4_hash_in_dirent(dir))
2389 rec_len += sizeof(struct ext4_dir_entry_hash);
2390 return (rec_len & ~EXT4_DIR_ROUND);
2391}
2392
2393/*
2394 * If we ever get support for fs block sizes > page_size, we'll need
2395 * to remove the #if statements in the next two functions...
2396 */
2397static inline unsigned int
2398ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2399{
2400 unsigned len = le16_to_cpu(dlen);
2401
2402#if (PAGE_SIZE >= 65536)
2403 if (len == EXT4_MAX_REC_LEN || len == 0)
2404 return blocksize;
2405 return (len & 65532) | ((len & 3) << 16);
2406#else
2407 return len;
2408#endif
2409}
2410
2411static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2412{
2413 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2414#if (PAGE_SIZE >= 65536)
2415 if (len < 65536)
2416 return cpu_to_le16(len);
2417 if (len == blocksize) {
2418 if (blocksize == 65536)
2419 return cpu_to_le16(EXT4_MAX_REC_LEN);
2420 else
2421 return cpu_to_le16(0);
2422 }
2423 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2424#else
2425 return cpu_to_le16(len);
2426#endif
2427}
2428
2429/*
2430 * Hash Tree Directory indexing
2431 * (c) Daniel Phillips, 2001
2432 */
2433
2434#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2435 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2436#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2437 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2438#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2439
2440/* Legal values for the dx_root hash_version field: */
2441
2442#define DX_HASH_LEGACY 0
2443#define DX_HASH_HALF_MD4 1
2444#define DX_HASH_TEA 2
2445#define DX_HASH_LEGACY_UNSIGNED 3
2446#define DX_HASH_HALF_MD4_UNSIGNED 4
2447#define DX_HASH_TEA_UNSIGNED 5
2448#define DX_HASH_SIPHASH 6
2449
2450static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2451 const void *address, unsigned int length)
2452{
2453 struct {
2454 struct shash_desc shash;
2455 char ctx[4];
2456 } desc;
2457
2458 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2459
2460 desc.shash.tfm = sbi->s_chksum_driver;
2461 *(u32 *)desc.ctx = crc;
2462
2463 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2464
2465 return *(u32 *)desc.ctx;
2466}
2467
2468#ifdef __KERNEL__
2469
2470/* hash info structure used by the directory hash */
2471struct dx_hash_info
2472{
2473 u32 hash;
2474 u32 minor_hash;
2475 int hash_version;
2476 u32 *seed;
2477};
2478
2479
2480/* 32 and 64 bit signed EOF for dx directories */
2481#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2482#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2483
2484
2485/*
2486 * Control parameters used by ext4_htree_next_block
2487 */
2488#define HASH_NB_ALWAYS 1
2489
2490struct ext4_filename {
2491 const struct qstr *usr_fname;
2492 struct fscrypt_str disk_name;
2493 struct dx_hash_info hinfo;
2494#ifdef CONFIG_FS_ENCRYPTION
2495 struct fscrypt_str crypto_buf;
2496#endif
2497#if IS_ENABLED(CONFIG_UNICODE)
2498 struct fscrypt_str cf_name;
2499#endif
2500};
2501
2502#define fname_name(p) ((p)->disk_name.name)
2503#define fname_usr_name(p) ((p)->usr_fname->name)
2504#define fname_len(p) ((p)->disk_name.len)
2505
2506/*
2507 * Describe an inode's exact location on disk and in memory
2508 */
2509struct ext4_iloc
2510{
2511 struct buffer_head *bh;
2512 unsigned long offset;
2513 ext4_group_t block_group;
2514};
2515
2516static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2517{
2518 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2519}
2520
2521static inline bool ext4_is_quota_file(struct inode *inode)
2522{
2523 return IS_NOQUOTA(inode) &&
2524 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2525}
2526
2527/*
2528 * This structure is stuffed into the struct file's private_data field
2529 * for directories. It is where we put information so that we can do
2530 * readdir operations in hash tree order.
2531 */
2532struct dir_private_info {
2533 struct rb_root root;
2534 struct rb_node *curr_node;
2535 struct fname *extra_fname;
2536 loff_t last_pos;
2537 __u32 curr_hash;
2538 __u32 curr_minor_hash;
2539 __u32 next_hash;
2540};
2541
2542/* calculate the first block number of the group */
2543static inline ext4_fsblk_t
2544ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2545{
2546 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2547 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2548}
2549
2550/*
2551 * Special error return code only used by dx_probe() and its callers.
2552 */
2553#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2554
2555/* htree levels for ext4 */
2556#define EXT4_HTREE_LEVEL_COMPAT 2
2557#define EXT4_HTREE_LEVEL 3
2558
2559static inline int ext4_dir_htree_level(struct super_block *sb)
2560{
2561 return ext4_has_feature_largedir(sb) ?
2562 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2563}
2564
2565/*
2566 * Timeout and state flag for lazy initialization inode thread.
2567 */
2568#define EXT4_DEF_LI_WAIT_MULT 10
2569#define EXT4_DEF_LI_MAX_START_DELAY 5
2570#define EXT4_LAZYINIT_QUIT 0x0001
2571#define EXT4_LAZYINIT_RUNNING 0x0002
2572
2573/*
2574 * Lazy inode table initialization info
2575 */
2576struct ext4_lazy_init {
2577 unsigned long li_state;
2578 struct list_head li_request_list;
2579 struct mutex li_list_mtx;
2580};
2581
2582enum ext4_li_mode {
2583 EXT4_LI_MODE_PREFETCH_BBITMAP,
2584 EXT4_LI_MODE_ITABLE,
2585};
2586
2587struct ext4_li_request {
2588 struct super_block *lr_super;
2589 enum ext4_li_mode lr_mode;
2590 ext4_group_t lr_first_not_zeroed;
2591 ext4_group_t lr_next_group;
2592 struct list_head lr_request;
2593 unsigned long lr_next_sched;
2594 unsigned long lr_timeout;
2595};
2596
2597struct ext4_features {
2598 struct kobject f_kobj;
2599 struct completion f_kobj_unregister;
2600};
2601
2602/*
2603 * This structure will be used for multiple mount protection. It will be
2604 * written into the block number saved in the s_mmp_block field in the
2605 * superblock. Programs that check MMP should assume that if
2606 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2607 * to use the filesystem, regardless of how old the timestamp is.
2608 */
2609#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2610#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2611#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2612#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2613
2614struct mmp_struct {
2615 __le32 mmp_magic; /* Magic number for MMP */
2616 __le32 mmp_seq; /* Sequence no. updated periodically */
2617
2618 /*
2619 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2620 * purposes and do not affect the correctness of the algorithm
2621 */
2622 __le64 mmp_time; /* Time last updated */
2623 char mmp_nodename[64]; /* Node which last updated MMP block */
2624 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2625
2626 /*
2627 * mmp_check_interval is used to verify if the MMP block has been
2628 * updated on the block device. The value is updated based on the
2629 * maximum time to write the MMP block during an update cycle.
2630 */
2631 __le16 mmp_check_interval;
2632
2633 __le16 mmp_pad1;
2634 __le32 mmp_pad2[226];
2635 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2636};
2637
2638/* arguments passed to the mmp thread */
2639struct mmpd_data {
2640 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2641 struct super_block *sb; /* super block of the fs */
2642};
2643
2644/*
2645 * Check interval multiplier
2646 * The MMP block is written every update interval and initially checked every
2647 * update interval x the multiplier (the value is then adapted based on the
2648 * write latency). The reason is that writes can be delayed under load and we
2649 * don't want readers to incorrectly assume that the filesystem is no longer
2650 * in use.
2651 */
2652#define EXT4_MMP_CHECK_MULT 2UL
2653
2654/*
2655 * Minimum interval for MMP checking in seconds.
2656 */
2657#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2658
2659/*
2660 * Maximum interval for MMP checking in seconds.
2661 */
2662#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2663
2664/*
2665 * Function prototypes
2666 */
2667
2668/*
2669 * Ok, these declarations are also in <linux/kernel.h> but none of the
2670 * ext4 source programs needs to include it so they are duplicated here.
2671 */
2672# define NORET_TYPE /**/
2673# define ATTRIB_NORET __attribute__((noreturn))
2674# define NORET_AND noreturn,
2675
2676/* bitmap.c */
2677extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2678void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2679 struct ext4_group_desc *gdp,
2680 struct buffer_head *bh, int sz);
2681int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2682 struct ext4_group_desc *gdp,
2683 struct buffer_head *bh, int sz);
2684void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2685 struct ext4_group_desc *gdp,
2686 struct buffer_head *bh);
2687int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2688 struct ext4_group_desc *gdp,
2689 struct buffer_head *bh);
2690
2691/* balloc.c */
2692extern void ext4_get_group_no_and_offset(struct super_block *sb,
2693 ext4_fsblk_t blocknr,
2694 ext4_group_t *blockgrpp,
2695 ext4_grpblk_t *offsetp);
2696extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2697 ext4_fsblk_t block);
2698
2699extern unsigned int ext4_block_group(struct super_block *sb,
2700 ext4_fsblk_t blocknr);
2701extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2702 ext4_fsblk_t blocknr);
2703extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2704extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2705 ext4_group_t group);
2706extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2707 ext4_fsblk_t goal,
2708 unsigned int flags,
2709 unsigned long *count,
2710 int *errp);
2711extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2712 s64 nclusters, unsigned int flags);
2713extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2714extern void ext4_check_blocks_bitmap(struct super_block *);
2715extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2716 ext4_group_t block_group,
2717 struct buffer_head ** bh);
2718extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2719
2720extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2721 ext4_group_t block_group,
2722 bool ignore_locked);
2723extern int ext4_wait_block_bitmap(struct super_block *sb,
2724 ext4_group_t block_group,
2725 struct buffer_head *bh);
2726extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2727 ext4_group_t block_group);
2728extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2729 ext4_group_t block_group,
2730 struct ext4_group_desc *gdp);
2731ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2732
2733#if IS_ENABLED(CONFIG_UNICODE)
2734extern int ext4_fname_setup_ci_filename(struct inode *dir,
2735 const struct qstr *iname,
2736 struct ext4_filename *fname);
2737#endif
2738
2739/* ext4 encryption related stuff goes here crypto.c */
2740#ifdef CONFIG_FS_ENCRYPTION
2741extern const struct fscrypt_operations ext4_cryptops;
2742
2743int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2744 int lookup, struct ext4_filename *fname);
2745
2746int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2747 struct ext4_filename *fname);
2748
2749void ext4_fname_free_filename(struct ext4_filename *fname);
2750
2751int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2752
2753#else /* !CONFIG_FS_ENCRYPTION */
2754static inline int ext4_fname_setup_filename(struct inode *dir,
2755 const struct qstr *iname,
2756 int lookup,
2757 struct ext4_filename *fname)
2758{
2759 int err = 0;
2760 fname->usr_fname = iname;
2761 fname->disk_name.name = (unsigned char *) iname->name;
2762 fname->disk_name.len = iname->len;
2763
2764#if IS_ENABLED(CONFIG_UNICODE)
2765 err = ext4_fname_setup_ci_filename(dir, iname, fname);
2766#endif
2767
2768 return err;
2769}
2770
2771static inline int ext4_fname_prepare_lookup(struct inode *dir,
2772 struct dentry *dentry,
2773 struct ext4_filename *fname)
2774{
2775 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2776}
2777
2778static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2779{
2780#if IS_ENABLED(CONFIG_UNICODE)
2781 kfree(fname->cf_name.name);
2782 fname->cf_name.name = NULL;
2783#endif
2784}
2785
2786static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2787 void __user *arg)
2788{
2789 return -EOPNOTSUPP;
2790}
2791#endif /* !CONFIG_FS_ENCRYPTION */
2792
2793/* dir.c */
2794extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2795 struct file *,
2796 struct ext4_dir_entry_2 *,
2797 struct buffer_head *, char *, int,
2798 unsigned int);
2799#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2800 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2801 (de), (bh), (buf), (size), (offset)))
2802extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2803 __u32 minor_hash,
2804 struct ext4_dir_entry_2 *dirent,
2805 struct fscrypt_str *ent_name);
2806extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2807extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2808 struct buffer_head *bh,
2809 void *buf, int buf_size,
2810 struct ext4_filename *fname,
2811 struct ext4_dir_entry_2 **dest_de);
2812void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2813 struct ext4_dir_entry_2 *de,
2814 int buf_size,
2815 struct ext4_filename *fname);
2816static inline void ext4_update_dx_flag(struct inode *inode)
2817{
2818 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2819 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2820 /* ext4_iget() should have caught this... */
2821 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2822 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2823 }
2824}
2825static const unsigned char ext4_filetype_table[] = {
2826 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2827};
2828
2829static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2830{
2831 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2832 return DT_UNKNOWN;
2833
2834 return ext4_filetype_table[filetype];
2835}
2836extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2837 void *buf, int buf_size);
2838
2839/* fsync.c */
2840extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2841
2842/* hash.c */
2843extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2844 struct dx_hash_info *hinfo);
2845
2846/* ialloc.c */
2847extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2848extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2849 struct inode *, umode_t,
2850 const struct qstr *qstr, __u32 goal,
2851 uid_t *owner, __u32 i_flags,
2852 int handle_type, unsigned int line_no,
2853 int nblocks);
2854
2855#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2856 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \
2857 (goal), (owner), i_flags, 0, 0, 0)
2858#define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2859 type, nblocks) \
2860 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2861 0, (type), __LINE__, (nblocks))
2862
2863
2864extern void ext4_free_inode(handle_t *, struct inode *);
2865extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2866extern unsigned long ext4_count_free_inodes(struct super_block *);
2867extern unsigned long ext4_count_dirs(struct super_block *);
2868extern void ext4_check_inodes_bitmap(struct super_block *);
2869extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2870extern int ext4_init_inode_table(struct super_block *sb,
2871 ext4_group_t group, int barrier);
2872extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2873
2874/* fast_commit.c */
2875int ext4_fc_info_show(struct seq_file *seq, void *v);
2876void ext4_fc_init(struct super_block *sb, journal_t *journal);
2877void ext4_fc_init_inode(struct inode *inode);
2878void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2879 ext4_lblk_t end);
2880void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2881 struct dentry *dentry);
2882void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2883 struct dentry *dentry);
2884void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2885void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2886void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2887 struct dentry *dentry);
2888void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2889void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2890void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2891void ext4_fc_start_update(struct inode *inode);
2892void ext4_fc_stop_update(struct inode *inode);
2893void ext4_fc_del(struct inode *inode);
2894bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2895void ext4_fc_replay_cleanup(struct super_block *sb);
2896int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2897int __init ext4_fc_init_dentry_cache(void);
2898void ext4_fc_destroy_dentry_cache(void);
2899int ext4_fc_record_regions(struct super_block *sb, int ino,
2900 ext4_lblk_t lblk, ext4_fsblk_t pblk,
2901 int len, int replay);
2902
2903/* mballoc.c */
2904extern const struct seq_operations ext4_mb_seq_groups_ops;
2905extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2906extern long ext4_mb_stats;
2907extern long ext4_mb_max_to_scan;
2908extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2909extern int ext4_mb_init(struct super_block *);
2910extern int ext4_mb_release(struct super_block *);
2911extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2912 struct ext4_allocation_request *, int *);
2913extern int ext4_mb_reserve_blocks(struct super_block *, int);
2914extern void ext4_discard_preallocations(struct inode *, unsigned int);
2915extern int __init ext4_init_mballoc(void);
2916extern void ext4_exit_mballoc(void);
2917extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2918 ext4_group_t group,
2919 unsigned int nr, int *cnt);
2920extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2921 unsigned int nr);
2922
2923extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2924 struct buffer_head *bh, ext4_fsblk_t block,
2925 unsigned long count, int flags);
2926extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2927 ext4_group_t ngroups);
2928extern int ext4_mb_add_groupinfo(struct super_block *sb,
2929 ext4_group_t i, struct ext4_group_desc *desc);
2930extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2931 ext4_fsblk_t block, unsigned long count);
2932extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2933extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2934extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2935 int len, int state);
2936
2937/* inode.c */
2938void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2939 struct ext4_inode_info *ei);
2940int ext4_inode_is_fast_symlink(struct inode *inode);
2941struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2942struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2943int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2944 bool wait, struct buffer_head **bhs);
2945int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2946 struct buffer_head *bh_result, int create);
2947int ext4_get_block(struct inode *inode, sector_t iblock,
2948 struct buffer_head *bh_result, int create);
2949int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2950 struct buffer_head *bh, int create);
2951int ext4_walk_page_buffers(handle_t *handle,
2952 struct inode *inode,
2953 struct buffer_head *head,
2954 unsigned from,
2955 unsigned to,
2956 int *partial,
2957 int (*fn)(handle_t *handle, struct inode *inode,
2958 struct buffer_head *bh));
2959int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2960 struct buffer_head *bh);
2961#define FALL_BACK_TO_NONDELALLOC 1
2962#define CONVERT_INLINE_DATA 2
2963
2964typedef enum {
2965 EXT4_IGET_NORMAL = 0,
2966 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2967 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */
2968 EXT4_IGET_BAD = 0x0004 /* Allow to iget a bad inode */
2969} ext4_iget_flags;
2970
2971extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2972 ext4_iget_flags flags, const char *function,
2973 unsigned int line);
2974
2975#define ext4_iget(sb, ino, flags) \
2976 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2977
2978extern int ext4_write_inode(struct inode *, struct writeback_control *);
2979extern int ext4_setattr(struct user_namespace *, struct dentry *,
2980 struct iattr *);
2981extern u32 ext4_dio_alignment(struct inode *inode);
2982extern int ext4_getattr(struct user_namespace *, const struct path *,
2983 struct kstat *, u32, unsigned int);
2984extern void ext4_evict_inode(struct inode *);
2985extern void ext4_clear_inode(struct inode *);
2986extern int ext4_file_getattr(struct user_namespace *, const struct path *,
2987 struct kstat *, u32, unsigned int);
2988extern int ext4_sync_inode(handle_t *, struct inode *);
2989extern void ext4_dirty_inode(struct inode *, int);
2990extern int ext4_change_inode_journal_flag(struct inode *, int);
2991extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2992extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2993 struct ext4_iloc *iloc);
2994extern int ext4_inode_attach_jinode(struct inode *inode);
2995extern int ext4_can_truncate(struct inode *inode);
2996extern int ext4_truncate(struct inode *);
2997extern int ext4_break_layouts(struct inode *);
2998extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2999extern void ext4_set_inode_flags(struct inode *, bool init);
3000extern int ext4_alloc_da_blocks(struct inode *inode);
3001extern void ext4_set_aops(struct inode *inode);
3002extern int ext4_writepage_trans_blocks(struct inode *);
3003extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
3004extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3005extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3006 loff_t lstart, loff_t lend);
3007extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3008extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3009extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3010extern void ext4_da_release_space(struct inode *inode, int to_free);
3011extern void ext4_da_update_reserve_space(struct inode *inode,
3012 int used, int quota_claim);
3013extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3014 ext4_fsblk_t pblk, ext4_lblk_t len);
3015
3016/* indirect.c */
3017extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3018 struct ext4_map_blocks *map, int flags);
3019extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3020extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3021extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3022 ext4_lblk_t start, ext4_lblk_t end);
3023
3024/* ioctl.c */
3025extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3026extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3027int ext4_fileattr_set(struct user_namespace *mnt_userns,
3028 struct dentry *dentry, struct fileattr *fa);
3029int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3030extern void ext4_reset_inode_seed(struct inode *inode);
3031int ext4_update_overhead(struct super_block *sb, bool force);
3032
3033/* migrate.c */
3034extern int ext4_ext_migrate(struct inode *);
3035extern int ext4_ind_migrate(struct inode *inode);
3036
3037/* namei.c */
3038extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3039 struct inode *inode);
3040extern int ext4_dirblock_csum_verify(struct inode *inode,
3041 struct buffer_head *bh);
3042extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3043 __u32 start_minor_hash, __u32 *next_hash);
3044extern int ext4_search_dir(struct buffer_head *bh,
3045 char *search_buf,
3046 int buf_size,
3047 struct inode *dir,
3048 struct ext4_filename *fname,
3049 unsigned int offset,
3050 struct ext4_dir_entry_2 **res_dir);
3051extern int ext4_generic_delete_entry(struct inode *dir,
3052 struct ext4_dir_entry_2 *de_del,
3053 struct buffer_head *bh,
3054 void *entry_buf,
3055 int buf_size,
3056 int csum_size);
3057extern bool ext4_empty_dir(struct inode *inode);
3058
3059/* resize.c */
3060extern void ext4_kvfree_array_rcu(void *to_free);
3061extern int ext4_group_add(struct super_block *sb,
3062 struct ext4_new_group_data *input);
3063extern int ext4_group_extend(struct super_block *sb,
3064 struct ext4_super_block *es,
3065 ext4_fsblk_t n_blocks_count);
3066extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3067extern unsigned int ext4_list_backups(struct super_block *sb,
3068 unsigned int *three, unsigned int *five,
3069 unsigned int *seven);
3070
3071/* super.c */
3072extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3073 sector_t block, blk_opf_t op_flags);
3074extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3075 sector_t block);
3076extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3077 bh_end_io_t *end_io);
3078extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3079 bh_end_io_t *end_io);
3080extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3081extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3082extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3083extern int ext4_calculate_overhead(struct super_block *sb);
3084extern __le32 ext4_superblock_csum(struct super_block *sb,
3085 struct ext4_super_block *es);
3086extern void ext4_superblock_csum_set(struct super_block *sb);
3087extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3088 ext4_group_t ngroup);
3089extern const char *ext4_decode_error(struct super_block *sb, int errno,
3090 char nbuf[16]);
3091extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3092 ext4_group_t block_group,
3093 unsigned int flags);
3094
3095extern __printf(7, 8)
3096void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3097 int, __u64, const char *, ...);
3098extern __printf(6, 7)
3099void __ext4_error_inode(struct inode *, const char *, unsigned int,
3100 ext4_fsblk_t, int, const char *, ...);
3101extern __printf(5, 6)
3102void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3103 const char *, ...);
3104extern void __ext4_std_error(struct super_block *, const char *,
3105 unsigned int, int);
3106extern __printf(4, 5)
3107void __ext4_warning(struct super_block *, const char *, unsigned int,
3108 const char *, ...);
3109extern __printf(4, 5)
3110void __ext4_warning_inode(const struct inode *inode, const char *function,
3111 unsigned int line, const char *fmt, ...);
3112extern __printf(3, 4)
3113void __ext4_msg(struct super_block *, const char *, const char *, ...);
3114extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3115 const char *, unsigned int, const char *);
3116extern __printf(7, 8)
3117void __ext4_grp_locked_error(const char *, unsigned int,
3118 struct super_block *, ext4_group_t,
3119 unsigned long, ext4_fsblk_t,
3120 const char *, ...);
3121
3122#define EXT4_ERROR_INODE(inode, fmt, a...) \
3123 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3124
3125#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3126 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3127
3128#define ext4_error_inode_block(inode, block, err, fmt, a...) \
3129 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3130 (fmt), ## a)
3131
3132#define EXT4_ERROR_FILE(file, block, fmt, a...) \
3133 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3134
3135#define ext4_abort(sb, err, fmt, a...) \
3136 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3137
3138#ifdef CONFIG_PRINTK
3139
3140#define ext4_error_inode(inode, func, line, block, fmt, ...) \
3141 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3142#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3143 __ext4_error_inode((inode), (func), (line), (block), \
3144 (err), (fmt), ##__VA_ARGS__)
3145#define ext4_error_file(file, func, line, block, fmt, ...) \
3146 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3147#define ext4_error(sb, fmt, ...) \
3148 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3149 ##__VA_ARGS__)
3150#define ext4_error_err(sb, err, fmt, ...) \
3151 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3152 ##__VA_ARGS__)
3153#define ext4_warning(sb, fmt, ...) \
3154 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3155#define ext4_warning_inode(inode, fmt, ...) \
3156 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3157#define ext4_msg(sb, level, fmt, ...) \
3158 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3159#define dump_mmp_msg(sb, mmp, msg) \
3160 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3161#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3162 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3163 fmt, ##__VA_ARGS__)
3164
3165#else
3166
3167#define ext4_error_inode(inode, func, line, block, fmt, ...) \
3168do { \
3169 no_printk(fmt, ##__VA_ARGS__); \
3170 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3171} while (0)
3172#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3173do { \
3174 no_printk(fmt, ##__VA_ARGS__); \
3175 __ext4_error_inode(inode, "", 0, block, err, " "); \
3176} while (0)
3177#define ext4_error_file(file, func, line, block, fmt, ...) \
3178do { \
3179 no_printk(fmt, ##__VA_ARGS__); \
3180 __ext4_error_file(file, "", 0, block, " "); \
3181} while (0)
3182#define ext4_error(sb, fmt, ...) \
3183do { \
3184 no_printk(fmt, ##__VA_ARGS__); \
3185 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3186} while (0)
3187#define ext4_error_err(sb, err, fmt, ...) \
3188do { \
3189 no_printk(fmt, ##__VA_ARGS__); \
3190 __ext4_error(sb, "", 0, false, err, 0, " "); \
3191} while (0)
3192#define ext4_warning(sb, fmt, ...) \
3193do { \
3194 no_printk(fmt, ##__VA_ARGS__); \
3195 __ext4_warning(sb, "", 0, " "); \
3196} while (0)
3197#define ext4_warning_inode(inode, fmt, ...) \
3198do { \
3199 no_printk(fmt, ##__VA_ARGS__); \
3200 __ext4_warning_inode(inode, "", 0, " "); \
3201} while (0)
3202#define ext4_msg(sb, level, fmt, ...) \
3203do { \
3204 no_printk(fmt, ##__VA_ARGS__); \
3205 __ext4_msg(sb, "", " "); \
3206} while (0)
3207#define dump_mmp_msg(sb, mmp, msg) \
3208 __dump_mmp_msg(sb, mmp, "", 0, "")
3209#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3210do { \
3211 no_printk(fmt, ##__VA_ARGS__); \
3212 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3213} while (0)
3214
3215#endif
3216
3217extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3218 struct ext4_group_desc *bg);
3219extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3220 struct ext4_group_desc *bg);
3221extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3222 struct ext4_group_desc *bg);
3223extern __u32 ext4_free_group_clusters(struct super_block *sb,
3224 struct ext4_group_desc *bg);
3225extern __u32 ext4_free_inodes_count(struct super_block *sb,
3226 struct ext4_group_desc *bg);
3227extern __u32 ext4_used_dirs_count(struct super_block *sb,
3228 struct ext4_group_desc *bg);
3229extern __u32 ext4_itable_unused_count(struct super_block *sb,
3230 struct ext4_group_desc *bg);
3231extern void ext4_block_bitmap_set(struct super_block *sb,
3232 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3233extern void ext4_inode_bitmap_set(struct super_block *sb,
3234 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3235extern void ext4_inode_table_set(struct super_block *sb,
3236 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3237extern void ext4_free_group_clusters_set(struct super_block *sb,
3238 struct ext4_group_desc *bg,
3239 __u32 count);
3240extern void ext4_free_inodes_set(struct super_block *sb,
3241 struct ext4_group_desc *bg, __u32 count);
3242extern void ext4_used_dirs_set(struct super_block *sb,
3243 struct ext4_group_desc *bg, __u32 count);
3244extern void ext4_itable_unused_set(struct super_block *sb,
3245 struct ext4_group_desc *bg, __u32 count);
3246extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3247 struct ext4_group_desc *gdp);
3248extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3249 struct ext4_group_desc *gdp);
3250extern int ext4_register_li_request(struct super_block *sb,
3251 ext4_group_t first_not_zeroed);
3252
3253static inline int ext4_has_metadata_csum(struct super_block *sb)
3254{
3255 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3256 !EXT4_SB(sb)->s_chksum_driver);
3257
3258 return ext4_has_feature_metadata_csum(sb) &&
3259 (EXT4_SB(sb)->s_chksum_driver != NULL);
3260}
3261
3262static inline int ext4_has_group_desc_csum(struct super_block *sb)
3263{
3264 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3265}
3266
3267#define ext4_read_incompat_64bit_val(es, name) \
3268 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3269 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3270 le32_to_cpu(es->name##_lo))
3271
3272static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3273{
3274 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3275}
3276
3277static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3278{
3279 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3280}
3281
3282static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3283{
3284 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3285}
3286
3287static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3288 ext4_fsblk_t blk)
3289{
3290 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3291 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3292}
3293
3294static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3295 ext4_fsblk_t blk)
3296{
3297 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3298 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3299}
3300
3301static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3302 ext4_fsblk_t blk)
3303{
3304 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3305 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3306}
3307
3308static inline loff_t ext4_isize(struct super_block *sb,
3309 struct ext4_inode *raw_inode)
3310{
3311 if (ext4_has_feature_largedir(sb) ||
3312 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3313 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3314 le32_to_cpu(raw_inode->i_size_lo);
3315
3316 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3317}
3318
3319static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3320{
3321 raw_inode->i_size_lo = cpu_to_le32(i_size);
3322 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3323}
3324
3325static inline
3326struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3327 ext4_group_t group)
3328{
3329 struct ext4_group_info **grp_info;
3330 long indexv, indexh;
3331 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3332 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3333 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3334 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3335 return grp_info[indexh];
3336}
3337
3338/*
3339 * Reading s_groups_count requires using smp_rmb() afterwards. See
3340 * the locking protocol documented in the comments of ext4_group_add()
3341 * in resize.c
3342 */
3343static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3344{
3345 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3346
3347 smp_rmb();
3348 return ngroups;
3349}
3350
3351static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3352 ext4_group_t block_group)
3353{
3354 return block_group >> sbi->s_log_groups_per_flex;
3355}
3356
3357static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3358{
3359 return 1 << sbi->s_log_groups_per_flex;
3360}
3361
3362#define ext4_std_error(sb, errno) \
3363do { \
3364 if ((errno)) \
3365 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3366} while (0)
3367
3368#ifdef CONFIG_SMP
3369/* Each CPU can accumulate percpu_counter_batch clusters in their local
3370 * counters. So we need to make sure we have free clusters more
3371 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3372 */
3373#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3374#else
3375#define EXT4_FREECLUSTERS_WATERMARK 0
3376#endif
3377
3378/* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3379static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3380{
3381 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3382 !inode_is_locked(inode));
3383 down_write(&EXT4_I(inode)->i_data_sem);
3384 if (newsize > EXT4_I(inode)->i_disksize)
3385 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3386 up_write(&EXT4_I(inode)->i_data_sem);
3387}
3388
3389/* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3390static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3391{
3392 int changed = 0;
3393
3394 if (newsize > inode->i_size) {
3395 i_size_write(inode, newsize);
3396 changed = 1;
3397 }
3398 if (newsize > EXT4_I(inode)->i_disksize) {
3399 ext4_update_i_disksize(inode, newsize);
3400 changed |= 2;
3401 }
3402 return changed;
3403}
3404
3405int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3406 loff_t len);
3407
3408struct ext4_group_info {
3409 unsigned long bb_state;
3410#ifdef AGGRESSIVE_CHECK
3411 unsigned long bb_check_counter;
3412#endif
3413 struct rb_root bb_free_root;
3414 ext4_grpblk_t bb_first_free; /* first free block */
3415 ext4_grpblk_t bb_free; /* total free blocks */
3416 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3417 int bb_avg_fragment_size_order; /* order of average
3418 fragment in BG */
3419 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3420 ext4_group_t bb_group; /* Group number */
3421 struct list_head bb_prealloc_list;
3422#ifdef DOUBLE_CHECK
3423 void *bb_bitmap;
3424#endif
3425 struct rw_semaphore alloc_sem;
3426 struct list_head bb_avg_fragment_size_node;
3427 struct list_head bb_largest_free_order_node;
3428 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3429 * regions, index is order.
3430 * bb_counters[3] = 5 means
3431 * 5 free 8-block regions. */
3432};
3433
3434#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3435#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3436#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3437#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3438#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3439 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3440#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3441 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3442#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3443
3444#define EXT4_MB_GRP_NEED_INIT(grp) \
3445 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3446#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3447 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3448#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3449 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3450
3451#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3452 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3453#define EXT4_MB_GRP_SET_TRIMMED(grp) \
3454 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3455#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3456 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3457#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3458 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3459
3460#define EXT4_MAX_CONTENTION 8
3461#define EXT4_CONTENTION_THRESHOLD 2
3462
3463static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3464 ext4_group_t group)
3465{
3466 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3467}
3468
3469/*
3470 * Returns true if the filesystem is busy enough that attempts to
3471 * access the block group locks has run into contention.
3472 */
3473static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3474{
3475 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3476}
3477
3478static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3479{
3480 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3481 if (spin_trylock(lock))
3482 /*
3483 * We're able to grab the lock right away, so drop the
3484 * lock contention counter.
3485 */
3486 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3487 else {
3488 /*
3489 * The lock is busy, so bump the contention counter,
3490 * and then wait on the spin lock.
3491 */
3492 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3493 EXT4_MAX_CONTENTION);
3494 spin_lock(lock);
3495 }
3496}
3497
3498static inline void ext4_unlock_group(struct super_block *sb,
3499 ext4_group_t group)
3500{
3501 spin_unlock(ext4_group_lock_ptr(sb, group));
3502}
3503
3504#ifdef CONFIG_QUOTA
3505static inline bool ext4_quota_capable(struct super_block *sb)
3506{
3507 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3508}
3509
3510static inline bool ext4_is_quota_journalled(struct super_block *sb)
3511{
3512 struct ext4_sb_info *sbi = EXT4_SB(sb);
3513
3514 return (ext4_has_feature_quota(sb) ||
3515 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3516}
3517int ext4_enable_quotas(struct super_block *sb);
3518#endif
3519
3520/*
3521 * Block validity checking
3522 */
3523#define ext4_check_indirect_blockref(inode, bh) \
3524 ext4_check_blockref(__func__, __LINE__, inode, \
3525 (__le32 *)(bh)->b_data, \
3526 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3527
3528#define ext4_ind_check_inode(inode) \
3529 ext4_check_blockref(__func__, __LINE__, inode, \
3530 EXT4_I(inode)->i_data, \
3531 EXT4_NDIR_BLOCKS)
3532
3533/*
3534 * Inodes and files operations
3535 */
3536
3537/* dir.c */
3538extern const struct file_operations ext4_dir_operations;
3539
3540/* file.c */
3541extern const struct inode_operations ext4_file_inode_operations;
3542extern const struct file_operations ext4_file_operations;
3543extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3544
3545/* inline.c */
3546extern int ext4_get_max_inline_size(struct inode *inode);
3547extern int ext4_find_inline_data_nolock(struct inode *inode);
3548extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3549 unsigned int len);
3550extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3551
3552extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3553extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3554 struct inode *inode,
3555 loff_t pos, unsigned len,
3556 struct page **pagep);
3557extern int ext4_write_inline_data_end(struct inode *inode,
3558 loff_t pos, unsigned len,
3559 unsigned copied,
3560 struct page *page);
3561extern struct buffer_head *
3562ext4_journalled_write_inline_data(struct inode *inode,
3563 unsigned len,
3564 struct page *page);
3565extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3566 struct inode *inode,
3567 loff_t pos, unsigned len,
3568 struct page **pagep,
3569 void **fsdata);
3570extern int ext4_try_add_inline_entry(handle_t *handle,
3571 struct ext4_filename *fname,
3572 struct inode *dir, struct inode *inode);
3573extern int ext4_try_create_inline_dir(handle_t *handle,
3574 struct inode *parent,
3575 struct inode *inode);
3576extern int ext4_read_inline_dir(struct file *filp,
3577 struct dir_context *ctx,
3578 int *has_inline_data);
3579extern int ext4_inlinedir_to_tree(struct file *dir_file,
3580 struct inode *dir, ext4_lblk_t block,
3581 struct dx_hash_info *hinfo,
3582 __u32 start_hash, __u32 start_minor_hash,
3583 int *has_inline_data);
3584extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3585 struct ext4_filename *fname,
3586 struct ext4_dir_entry_2 **res_dir,
3587 int *has_inline_data);
3588extern int ext4_delete_inline_entry(handle_t *handle,
3589 struct inode *dir,
3590 struct ext4_dir_entry_2 *de_del,
3591 struct buffer_head *bh,
3592 int *has_inline_data);
3593extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3594extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3595 struct ext4_dir_entry_2 **parent_de,
3596 int *retval);
3597extern void *ext4_read_inline_link(struct inode *inode);
3598
3599struct iomap;
3600extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3601
3602extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3603
3604extern int ext4_convert_inline_data(struct inode *inode);
3605
3606static inline int ext4_has_inline_data(struct inode *inode)
3607{
3608 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3609 EXT4_I(inode)->i_inline_off;
3610}
3611
3612/* namei.c */
3613extern const struct inode_operations ext4_dir_inode_operations;
3614extern const struct inode_operations ext4_special_inode_operations;
3615extern struct dentry *ext4_get_parent(struct dentry *child);
3616extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3617 struct ext4_dir_entry_2 *de,
3618 int blocksize, int csum_size,
3619 unsigned int parent_ino, int dotdot_real_len);
3620extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3621 unsigned int blocksize);
3622extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3623 struct buffer_head *bh);
3624extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3625 struct inode *inode, struct dentry *dentry);
3626extern int __ext4_link(struct inode *dir, struct inode *inode,
3627 struct dentry *dentry);
3628
3629#define S_SHIFT 12
3630static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3631 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3632 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3633 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3634 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3635 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3636 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3637 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3638};
3639
3640static inline void ext4_set_de_type(struct super_block *sb,
3641 struct ext4_dir_entry_2 *de,
3642 umode_t mode) {
3643 if (ext4_has_feature_filetype(sb))
3644 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3645}
3646
3647/* readpages.c */
3648extern int ext4_mpage_readpages(struct inode *inode,
3649 struct readahead_control *rac, struct page *page);
3650extern int __init ext4_init_post_read_processing(void);
3651extern void ext4_exit_post_read_processing(void);
3652
3653/* symlink.c */
3654extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3655extern const struct inode_operations ext4_symlink_inode_operations;
3656extern const struct inode_operations ext4_fast_symlink_inode_operations;
3657
3658/* sysfs.c */
3659extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3660extern int ext4_register_sysfs(struct super_block *sb);
3661extern void ext4_unregister_sysfs(struct super_block *sb);
3662extern int __init ext4_init_sysfs(void);
3663extern void ext4_exit_sysfs(void);
3664
3665/* block_validity */
3666extern void ext4_release_system_zone(struct super_block *sb);
3667extern int ext4_setup_system_zone(struct super_block *sb);
3668extern int __init ext4_init_system_zone(void);
3669extern void ext4_exit_system_zone(void);
3670extern int ext4_inode_block_valid(struct inode *inode,
3671 ext4_fsblk_t start_blk,
3672 unsigned int count);
3673extern int ext4_check_blockref(const char *, unsigned int,
3674 struct inode *, __le32 *, unsigned int);
3675extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3676 ext4_fsblk_t start_blk, unsigned int count);
3677
3678
3679/* extents.c */
3680struct ext4_ext_path;
3681struct ext4_extent;
3682
3683/*
3684 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3685 * __le32.
3686 */
3687#define EXT_MAX_BLOCKS 0xffffffff
3688
3689extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3690extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3691extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3692 struct ext4_map_blocks *map, int flags);
3693extern int ext4_ext_truncate(handle_t *, struct inode *);
3694extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3695 ext4_lblk_t end);
3696extern void ext4_ext_init(struct super_block *);
3697extern void ext4_ext_release(struct super_block *);
3698extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3699 loff_t len);
3700extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3701 loff_t offset, ssize_t len);
3702extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3703 ext4_io_end_t *io_end);
3704extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3705 struct ext4_map_blocks *map, int flags);
3706extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3707 int num,
3708 struct ext4_ext_path *path);
3709extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3710 struct ext4_ext_path **,
3711 struct ext4_extent *, int);
3712extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3713 struct ext4_ext_path **,
3714 int flags);
3715extern void ext4_free_ext_path(struct ext4_ext_path *);
3716extern int ext4_ext_check_inode(struct inode *inode);
3717extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3718extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3719 __u64 start, __u64 len);
3720extern int ext4_get_es_cache(struct inode *inode,
3721 struct fiemap_extent_info *fieinfo,
3722 __u64 start, __u64 len);
3723extern int ext4_ext_precache(struct inode *inode);
3724extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3725 struct inode *inode2, ext4_lblk_t lblk1,
3726 ext4_lblk_t lblk2, ext4_lblk_t count,
3727 int mark_unwritten,int *err);
3728extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3729extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3730 int check_cred, int restart_cred,
3731 int revoke_cred);
3732extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3733extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3734extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3735 int len, int unwritten, ext4_fsblk_t pblk);
3736extern int ext4_ext_clear_bb(struct inode *inode);
3737
3738
3739/* move_extent.c */
3740extern void ext4_double_down_write_data_sem(struct inode *first,
3741 struct inode *second);
3742extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3743 struct inode *donor_inode);
3744extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3745 __u64 start_orig, __u64 start_donor,
3746 __u64 len, __u64 *moved_len);
3747
3748/* page-io.c */
3749extern int __init ext4_init_pageio(void);
3750extern void ext4_exit_pageio(void);
3751extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3752extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3753extern int ext4_put_io_end(ext4_io_end_t *io_end);
3754extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3755extern void ext4_io_submit_init(struct ext4_io_submit *io,
3756 struct writeback_control *wbc);
3757extern void ext4_end_io_rsv_work(struct work_struct *work);
3758extern void ext4_io_submit(struct ext4_io_submit *io);
3759extern int ext4_bio_write_page(struct ext4_io_submit *io,
3760 struct page *page,
3761 int len);
3762extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3763extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3764
3765/* mmp.c */
3766extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3767
3768/* mmp.c */
3769extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3770
3771/* verity.c */
3772extern const struct fsverity_operations ext4_verityops;
3773
3774/* orphan.c */
3775extern int ext4_orphan_add(handle_t *, struct inode *);
3776extern int ext4_orphan_del(handle_t *, struct inode *);
3777extern void ext4_orphan_cleanup(struct super_block *sb,
3778 struct ext4_super_block *es);
3779extern void ext4_release_orphan_info(struct super_block *sb);
3780extern int ext4_init_orphan_info(struct super_block *sb);
3781extern int ext4_orphan_file_empty(struct super_block *sb);
3782extern void ext4_orphan_file_block_trigger(
3783 struct jbd2_buffer_trigger_type *triggers,
3784 struct buffer_head *bh,
3785 void *data, size_t size);
3786
3787/*
3788 * Add new method to test whether block and inode bitmaps are properly
3789 * initialized. With uninit_bg reading the block from disk is not enough
3790 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3791 */
3792#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3793
3794static inline int bitmap_uptodate(struct buffer_head *bh)
3795{
3796 return (buffer_uptodate(bh) &&
3797 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3798}
3799static inline void set_bitmap_uptodate(struct buffer_head *bh)
3800{
3801 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3802}
3803
3804#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3805
3806/* For ioend & aio unwritten conversion wait queues */
3807#define EXT4_WQ_HASH_SZ 37
3808#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3809 EXT4_WQ_HASH_SZ])
3810extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3811
3812extern int ext4_resize_begin(struct super_block *sb);
3813extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3814
3815static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3816 struct ext4_io_end *io_end)
3817{
3818 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3819 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3820 atomic_inc(&EXT4_I(inode)->i_unwritten);
3821 }
3822}
3823
3824static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3825{
3826 struct inode *inode = io_end->inode;
3827
3828 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3829 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3830 /* Wake up anyone waiting on unwritten extent conversion */
3831 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3832 wake_up_all(ext4_ioend_wq(inode));
3833 }
3834}
3835
3836extern const struct iomap_ops ext4_iomap_ops;
3837extern const struct iomap_ops ext4_iomap_overwrite_ops;
3838extern const struct iomap_ops ext4_iomap_report_ops;
3839
3840static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3841{
3842 /*
3843 * If the buffer has the write error flag, we have failed
3844 * to write out data in the block. In this case, we don't
3845 * have to read the block because we may read the old data
3846 * successfully.
3847 */
3848 if (buffer_write_io_error(bh))
3849 set_buffer_uptodate(bh);
3850 return buffer_uptodate(bh);
3851}
3852
3853#endif /* __KERNEL__ */
3854
3855#define EFSBADCRC EBADMSG /* Bad CRC detected */
3856#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3857
3858#endif /* _EXT4_H */