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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/types.h>
21#include <linux/blkdev.h>
22#include <linux/magic.h>
23#include <linux/jbd2.h>
24#include <linux/quota.h>
25#include <linux/rwsem.h>
26#include <linux/rbtree.h>
27#include <linux/seqlock.h>
28#include <linux/mutex.h>
29#include <linux/timer.h>
30#include <linux/wait.h>
31#include <linux/sched/signal.h>
32#include <linux/blockgroup_lock.h>
33#include <linux/percpu_counter.h>
34#include <linux/ratelimit.h>
35#include <crypto/hash.h>
36#include <linux/falloc.h>
37#include <linux/percpu-rwsem.h>
38#include <linux/fiemap.h>
39#ifdef __KERNEL__
40#include <linux/compat.h>
41#endif
42
43#include <linux/fscrypt.h>
44#include <linux/fsverity.h>
45
46#include <linux/compiler.h>
47
48/*
49 * The fourth extended filesystem constants/structures
50 */
51
52/*
53 * with AGGRESSIVE_CHECK allocator runs consistency checks over
54 * structures. these checks slow things down a lot
55 */
56#define AGGRESSIVE_CHECK__
57
58/*
59 * with DOUBLE_CHECK defined mballoc creates persistent in-core
60 * bitmaps, maintains and uses them to check for double allocations
61 */
62#define DOUBLE_CHECK__
63
64/*
65 * Define EXT4FS_DEBUG to produce debug messages
66 */
67#undef EXT4FS_DEBUG
68
69/*
70 * Debug code
71 */
72#ifdef EXT4FS_DEBUG
73#define ext4_debug(f, a...) \
74 do { \
75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
76 __FILE__, __LINE__, __func__); \
77 printk(KERN_DEBUG f, ## a); \
78 } while (0)
79#else
80#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
81#endif
82
83 /*
84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
85 */
86#define EXT_DEBUG__
87
88/*
89 * Dynamic printk for controlled extents debugging.
90 */
91#ifdef CONFIG_EXT4_DEBUG
92#define ext_debug(ino, fmt, ...) \
93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
94 current->comm, task_pid_nr(current), \
95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
96 __func__, ##__VA_ARGS__)
97#else
98#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
99#endif
100
101#define ASSERT(assert) \
102do { \
103 if (unlikely(!(assert))) { \
104 printk(KERN_EMERG \
105 "Assertion failure in %s() at %s:%d: '%s'\n", \
106 __func__, __FILE__, __LINE__, #assert); \
107 BUG(); \
108 } \
109} while (0)
110
111/* data type for block offset of block group */
112typedef int ext4_grpblk_t;
113
114/* data type for filesystem-wide blocks number */
115typedef unsigned long long ext4_fsblk_t;
116
117/* data type for file logical block number */
118typedef __u32 ext4_lblk_t;
119
120/* data type for block group number */
121typedef unsigned int ext4_group_t;
122
123enum SHIFT_DIRECTION {
124 SHIFT_LEFT = 0,
125 SHIFT_RIGHT,
126};
127
128/*
129 * Flags used in mballoc's allocation_context flags field.
130 *
131 * Also used to show what's going on for debugging purposes when the
132 * flag field is exported via the traceport interface
133 */
134
135/* prefer goal again. length */
136#define EXT4_MB_HINT_MERGE 0x0001
137/* blocks already reserved */
138#define EXT4_MB_HINT_RESERVED 0x0002
139/* metadata is being allocated */
140#define EXT4_MB_HINT_METADATA 0x0004
141/* first blocks in the file */
142#define EXT4_MB_HINT_FIRST 0x0008
143/* search for the best chunk */
144#define EXT4_MB_HINT_BEST 0x0010
145/* data is being allocated */
146#define EXT4_MB_HINT_DATA 0x0020
147/* don't preallocate (for tails) */
148#define EXT4_MB_HINT_NOPREALLOC 0x0040
149/* allocate for locality group */
150#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
151/* allocate goal blocks or none */
152#define EXT4_MB_HINT_GOAL_ONLY 0x0100
153/* goal is meaningful */
154#define EXT4_MB_HINT_TRY_GOAL 0x0200
155/* blocks already pre-reserved by delayed allocation */
156#define EXT4_MB_DELALLOC_RESERVED 0x0400
157/* We are doing stream allocation */
158#define EXT4_MB_STREAM_ALLOC 0x0800
159/* Use reserved root blocks if needed */
160#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
161/* Use blocks from reserved pool */
162#define EXT4_MB_USE_RESERVED 0x2000
163/* Do strict check for free blocks while retrying block allocation */
164#define EXT4_MB_STRICT_CHECK 0x4000
165/* Large fragment size list lookup succeeded at least once for cr = 0 */
166#define EXT4_MB_CR0_OPTIMIZED 0x8000
167/* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
168#define EXT4_MB_CR1_OPTIMIZED 0x00010000
169/* Perform linear traversal for one group */
170#define EXT4_MB_SEARCH_NEXT_LINEAR 0x00020000
171struct ext4_allocation_request {
172 /* target inode for block we're allocating */
173 struct inode *inode;
174 /* how many blocks we want to allocate */
175 unsigned int len;
176 /* logical block in target inode */
177 ext4_lblk_t logical;
178 /* the closest logical allocated block to the left */
179 ext4_lblk_t lleft;
180 /* the closest logical allocated block to the right */
181 ext4_lblk_t lright;
182 /* phys. target (a hint) */
183 ext4_fsblk_t goal;
184 /* phys. block for the closest logical allocated block to the left */
185 ext4_fsblk_t pleft;
186 /* phys. block for the closest logical allocated block to the right */
187 ext4_fsblk_t pright;
188 /* flags. see above EXT4_MB_HINT_* */
189 unsigned int flags;
190};
191
192/*
193 * Logical to physical block mapping, used by ext4_map_blocks()
194 *
195 * This structure is used to pass requests into ext4_map_blocks() as
196 * well as to store the information returned by ext4_map_blocks(). It
197 * takes less room on the stack than a struct buffer_head.
198 */
199#define EXT4_MAP_NEW BIT(BH_New)
200#define EXT4_MAP_MAPPED BIT(BH_Mapped)
201#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
202#define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
203#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
204 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
205
206struct ext4_map_blocks {
207 ext4_fsblk_t m_pblk;
208 ext4_lblk_t m_lblk;
209 unsigned int m_len;
210 unsigned int m_flags;
211};
212
213/*
214 * Block validity checking, system zone rbtree.
215 */
216struct ext4_system_blocks {
217 struct rb_root root;
218 struct rcu_head rcu;
219};
220
221/*
222 * Flags for ext4_io_end->flags
223 */
224#define EXT4_IO_END_UNWRITTEN 0x0001
225
226struct ext4_io_end_vec {
227 struct list_head list; /* list of io_end_vec */
228 loff_t offset; /* offset in the file */
229 ssize_t size; /* size of the extent */
230};
231
232/*
233 * For converting unwritten extents on a work queue. 'handle' is used for
234 * buffered writeback.
235 */
236typedef struct ext4_io_end {
237 struct list_head list; /* per-file finished IO list */
238 handle_t *handle; /* handle reserved for extent
239 * conversion */
240 struct inode *inode; /* file being written to */
241 struct bio *bio; /* Linked list of completed
242 * bios covering the extent */
243 unsigned int flag; /* unwritten or not */
244 atomic_t count; /* reference counter */
245 struct list_head list_vec; /* list of ext4_io_end_vec */
246} ext4_io_end_t;
247
248struct ext4_io_submit {
249 struct writeback_control *io_wbc;
250 struct bio *io_bio;
251 ext4_io_end_t *io_end;
252 sector_t io_next_block;
253};
254
255/*
256 * Special inodes numbers
257 */
258#define EXT4_BAD_INO 1 /* Bad blocks inode */
259#define EXT4_ROOT_INO 2 /* Root inode */
260#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
261#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
262#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
263#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
264#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
265#define EXT4_JOURNAL_INO 8 /* Journal inode */
266
267/* First non-reserved inode for old ext4 filesystems */
268#define EXT4_GOOD_OLD_FIRST_INO 11
269
270/*
271 * Maximal count of links to a file
272 */
273#define EXT4_LINK_MAX 65000
274
275/*
276 * Macro-instructions used to manage several block sizes
277 */
278#define EXT4_MIN_BLOCK_SIZE 1024
279#define EXT4_MAX_BLOCK_SIZE 65536
280#define EXT4_MIN_BLOCK_LOG_SIZE 10
281#define EXT4_MAX_BLOCK_LOG_SIZE 16
282#define EXT4_MAX_CLUSTER_LOG_SIZE 30
283#ifdef __KERNEL__
284# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
285#else
286# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
287#endif
288#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
289#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
290 EXT4_SB(s)->s_cluster_bits)
291#ifdef __KERNEL__
292# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
293# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
294#else
295# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
296#endif
297#ifdef __KERNEL__
298#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
299#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
300#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
301#else
302#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
303 EXT4_GOOD_OLD_INODE_SIZE : \
304 (s)->s_inode_size)
305#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
306 EXT4_GOOD_OLD_FIRST_INO : \
307 (s)->s_first_ino)
308#endif
309#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
310#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
311 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
312 blkbits))
313
314/* Translate a block number to a cluster number */
315#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
316/* Translate a cluster number to a block number */
317#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
318/* Translate # of blks to # of clusters */
319#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
320 (sbi)->s_cluster_bits)
321/* Mask out the low bits to get the starting block of the cluster */
322#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
323 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
324#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
325 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
326/* Fill in the low bits to get the last block of the cluster */
327#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
328 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
329/* Get the cluster offset */
330#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
331 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
332#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
333 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
334
335/*
336 * Structure of a blocks group descriptor
337 */
338struct ext4_group_desc
339{
340 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
341 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
342 __le32 bg_inode_table_lo; /* Inodes table block */
343 __le16 bg_free_blocks_count_lo;/* Free blocks count */
344 __le16 bg_free_inodes_count_lo;/* Free inodes count */
345 __le16 bg_used_dirs_count_lo; /* Directories count */
346 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
347 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
348 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
349 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
350 __le16 bg_itable_unused_lo; /* Unused inodes count */
351 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
352 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
353 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
354 __le32 bg_inode_table_hi; /* Inodes table block MSB */
355 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
356 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
357 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
358 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
359 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
360 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
361 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
362 __u32 bg_reserved;
363};
364
365#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
366 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
367 sizeof(__le16))
368#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
369 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
370 sizeof(__le16))
371
372/*
373 * Structure of a flex block group info
374 */
375
376struct flex_groups {
377 atomic64_t free_clusters;
378 atomic_t free_inodes;
379 atomic_t used_dirs;
380};
381
382#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
383#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
384#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
385
386/*
387 * Macro-instructions used to manage group descriptors
388 */
389#define EXT4_MIN_DESC_SIZE 32
390#define EXT4_MIN_DESC_SIZE_64BIT 64
391#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
392#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
393#ifdef __KERNEL__
394# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
395# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
396# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
397# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
398# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
399#else
400# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
401# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
402# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
403#endif
404
405/*
406 * Constants relative to the data blocks
407 */
408#define EXT4_NDIR_BLOCKS 12
409#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
410#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
411#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
412#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
413
414/*
415 * Inode flags
416 */
417#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
418#define EXT4_UNRM_FL 0x00000002 /* Undelete */
419#define EXT4_COMPR_FL 0x00000004 /* Compress file */
420#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
421#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
422#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
423#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
424#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
425/* Reserved for compression usage... */
426#define EXT4_DIRTY_FL 0x00000100
427#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
428#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
429 /* nb: was previously EXT2_ECOMPR_FL */
430#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
431/* End compression flags --- maybe not all used */
432#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
433#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
434#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
435#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
436#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
437#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
438#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
439#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
440#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
441#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
442/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
443
444#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
445
446#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
447#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
448#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
449#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
450
451/* User modifiable flags */
452#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
453 EXT4_UNRM_FL | \
454 EXT4_COMPR_FL | \
455 EXT4_SYNC_FL | \
456 EXT4_IMMUTABLE_FL | \
457 EXT4_APPEND_FL | \
458 EXT4_NODUMP_FL | \
459 EXT4_NOATIME_FL | \
460 EXT4_JOURNAL_DATA_FL | \
461 EXT4_NOTAIL_FL | \
462 EXT4_DIRSYNC_FL | \
463 EXT4_TOPDIR_FL | \
464 EXT4_EXTENTS_FL | \
465 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
466 EXT4_DAX_FL | \
467 EXT4_PROJINHERIT_FL | \
468 EXT4_CASEFOLD_FL)
469
470/* User visible flags */
471#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
472 EXT4_DIRTY_FL | \
473 EXT4_COMPRBLK_FL | \
474 EXT4_NOCOMPR_FL | \
475 EXT4_ENCRYPT_FL | \
476 EXT4_INDEX_FL | \
477 EXT4_VERITY_FL | \
478 EXT4_INLINE_DATA_FL)
479
480/* Flags that should be inherited by new inodes from their parent. */
481#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
482 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
483 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
484 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
485 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
486 EXT4_DAX_FL)
487
488/* Flags that are appropriate for regular files (all but dir-specific ones). */
489#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
490 EXT4_PROJINHERIT_FL))
491
492/* Flags that are appropriate for non-directories/regular files. */
493#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
494
495/* The only flags that should be swapped */
496#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
497
498/* Flags which are mutually exclusive to DAX */
499#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
500 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
501
502/* Mask out flags that are inappropriate for the given type of inode. */
503static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
504{
505 if (S_ISDIR(mode))
506 return flags;
507 else if (S_ISREG(mode))
508 return flags & EXT4_REG_FLMASK;
509 else
510 return flags & EXT4_OTHER_FLMASK;
511}
512
513/*
514 * Inode flags used for atomic set/get
515 */
516enum {
517 EXT4_INODE_SECRM = 0, /* Secure deletion */
518 EXT4_INODE_UNRM = 1, /* Undelete */
519 EXT4_INODE_COMPR = 2, /* Compress file */
520 EXT4_INODE_SYNC = 3, /* Synchronous updates */
521 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
522 EXT4_INODE_APPEND = 5, /* writes to file may only append */
523 EXT4_INODE_NODUMP = 6, /* do not dump file */
524 EXT4_INODE_NOATIME = 7, /* do not update atime */
525/* Reserved for compression usage... */
526 EXT4_INODE_DIRTY = 8,
527 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
528 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
529 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
530/* End compression flags --- maybe not all used */
531 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
532 EXT4_INODE_IMAGIC = 13, /* AFS directory */
533 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
534 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
535 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
536 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
537 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
538 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
539 EXT4_INODE_VERITY = 20, /* Verity protected inode */
540 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
541/* 22 was formerly EXT4_INODE_EOFBLOCKS */
542 EXT4_INODE_DAX = 25, /* Inode is DAX */
543 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
544 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
545 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
546 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
547};
548
549/*
550 * Since it's pretty easy to mix up bit numbers and hex values, we use a
551 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
552 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
553 * any extra space in the compiled kernel image, otherwise, the build will fail.
554 * It's important that these values are the same, since we are using
555 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
556 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
557 * values found in ext2, ext3 and ext4 filesystems, and of course the values
558 * defined in e2fsprogs.
559 *
560 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
561 */
562#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
563#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
564
565static inline void ext4_check_flag_values(void)
566{
567 CHECK_FLAG_VALUE(SECRM);
568 CHECK_FLAG_VALUE(UNRM);
569 CHECK_FLAG_VALUE(COMPR);
570 CHECK_FLAG_VALUE(SYNC);
571 CHECK_FLAG_VALUE(IMMUTABLE);
572 CHECK_FLAG_VALUE(APPEND);
573 CHECK_FLAG_VALUE(NODUMP);
574 CHECK_FLAG_VALUE(NOATIME);
575 CHECK_FLAG_VALUE(DIRTY);
576 CHECK_FLAG_VALUE(COMPRBLK);
577 CHECK_FLAG_VALUE(NOCOMPR);
578 CHECK_FLAG_VALUE(ENCRYPT);
579 CHECK_FLAG_VALUE(INDEX);
580 CHECK_FLAG_VALUE(IMAGIC);
581 CHECK_FLAG_VALUE(JOURNAL_DATA);
582 CHECK_FLAG_VALUE(NOTAIL);
583 CHECK_FLAG_VALUE(DIRSYNC);
584 CHECK_FLAG_VALUE(TOPDIR);
585 CHECK_FLAG_VALUE(HUGE_FILE);
586 CHECK_FLAG_VALUE(EXTENTS);
587 CHECK_FLAG_VALUE(VERITY);
588 CHECK_FLAG_VALUE(EA_INODE);
589 CHECK_FLAG_VALUE(INLINE_DATA);
590 CHECK_FLAG_VALUE(PROJINHERIT);
591 CHECK_FLAG_VALUE(CASEFOLD);
592 CHECK_FLAG_VALUE(RESERVED);
593}
594
595/* Used to pass group descriptor data when online resize is done */
596struct ext4_new_group_input {
597 __u32 group; /* Group number for this data */
598 __u64 block_bitmap; /* Absolute block number of block bitmap */
599 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
600 __u64 inode_table; /* Absolute block number of inode table start */
601 __u32 blocks_count; /* Total number of blocks in this group */
602 __u16 reserved_blocks; /* Number of reserved blocks in this group */
603 __u16 unused;
604};
605
606#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
607struct compat_ext4_new_group_input {
608 u32 group;
609 compat_u64 block_bitmap;
610 compat_u64 inode_bitmap;
611 compat_u64 inode_table;
612 u32 blocks_count;
613 u16 reserved_blocks;
614 u16 unused;
615};
616#endif
617
618/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
619struct ext4_new_group_data {
620 __u32 group;
621 __u64 block_bitmap;
622 __u64 inode_bitmap;
623 __u64 inode_table;
624 __u32 blocks_count;
625 __u16 reserved_blocks;
626 __u16 mdata_blocks;
627 __u32 free_clusters_count;
628};
629
630/* Indexes used to index group tables in ext4_new_group_data */
631enum {
632 BLOCK_BITMAP = 0, /* block bitmap */
633 INODE_BITMAP, /* inode bitmap */
634 INODE_TABLE, /* inode tables */
635 GROUP_TABLE_COUNT,
636};
637
638/*
639 * Flags used by ext4_map_blocks()
640 */
641 /* Allocate any needed blocks and/or convert an unwritten
642 extent to be an initialized ext4 */
643#define EXT4_GET_BLOCKS_CREATE 0x0001
644 /* Request the creation of an unwritten extent */
645#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
646#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
647 EXT4_GET_BLOCKS_CREATE)
648 /* Caller is from the delayed allocation writeout path
649 * finally doing the actual allocation of delayed blocks */
650#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
651 /* caller is from the direct IO path, request to creation of an
652 unwritten extents if not allocated, split the unwritten
653 extent if blocks has been preallocated already*/
654#define EXT4_GET_BLOCKS_PRE_IO 0x0008
655#define EXT4_GET_BLOCKS_CONVERT 0x0010
656#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
657 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
658 /* Convert extent to initialized after IO complete */
659#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
660 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
661 /* Eventual metadata allocation (due to growing extent tree)
662 * should not fail, so try to use reserved blocks for that.*/
663#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
664 /* Don't normalize allocation size (used for fallocate) */
665#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
666 /* Convert written extents to unwritten */
667#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
668 /* Write zeros to newly created written extents */
669#define EXT4_GET_BLOCKS_ZERO 0x0200
670#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
671 EXT4_GET_BLOCKS_ZERO)
672 /* Caller will submit data before dropping transaction handle. This
673 * allows jbd2 to avoid submitting data before commit. */
674#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
675
676/*
677 * The bit position of these flags must not overlap with any of the
678 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
679 * read_extent_tree_block(), ext4_split_extent_at(),
680 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
681 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
682 * caching the extents when reading from the extent tree while a
683 * truncate or punch hole operation is in progress.
684 */
685#define EXT4_EX_NOCACHE 0x40000000
686#define EXT4_EX_FORCE_CACHE 0x20000000
687#define EXT4_EX_NOFAIL 0x10000000
688
689/*
690 * Flags used by ext4_free_blocks
691 */
692#define EXT4_FREE_BLOCKS_METADATA 0x0001
693#define EXT4_FREE_BLOCKS_FORGET 0x0002
694#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
695#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
696#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
697#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
698#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
699
700/*
701 * ioctl commands
702 */
703#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
704#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
705#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
706#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
707#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
708#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
709#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
710#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
711#define EXT4_IOC_MIGRATE _IO('f', 9)
712 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
713 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
714#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
715#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
716#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
717#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
718#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
719/* ioctl codes 19--39 are reserved for fscrypt */
720#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
721#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
722#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
723#define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32)
724
725#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
726
727/*
728 * Flags for going down operation
729 */
730#define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
731#define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
732#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
733
734/*
735 * Flags returned by EXT4_IOC_GETSTATE
736 *
737 * We only expose to userspace a subset of the state flags in
738 * i_state_flags
739 */
740#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
741#define EXT4_STATE_FLAG_NEW 0x00000002
742#define EXT4_STATE_FLAG_NEWENTRY 0x00000004
743#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
744
745/* flags for ioctl EXT4_IOC_CHECKPOINT */
746#define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1
747#define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2
748#define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4
749#define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
750 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
751 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
752
753#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
754/*
755 * ioctl commands in 32 bit emulation
756 */
757#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
758#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
759#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
760#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
761#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
762#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
763#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
764#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
765#endif
766
767/*
768 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
769 * It indicates that the entry in extent status cache is for a hole.
770 */
771#define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
772
773/* Max physical block we can address w/o extents */
774#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
775
776/* Max logical block we can support */
777#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
778
779/*
780 * Structure of an inode on the disk
781 */
782struct ext4_inode {
783 __le16 i_mode; /* File mode */
784 __le16 i_uid; /* Low 16 bits of Owner Uid */
785 __le32 i_size_lo; /* Size in bytes */
786 __le32 i_atime; /* Access time */
787 __le32 i_ctime; /* Inode Change time */
788 __le32 i_mtime; /* Modification time */
789 __le32 i_dtime; /* Deletion Time */
790 __le16 i_gid; /* Low 16 bits of Group Id */
791 __le16 i_links_count; /* Links count */
792 __le32 i_blocks_lo; /* Blocks count */
793 __le32 i_flags; /* File flags */
794 union {
795 struct {
796 __le32 l_i_version;
797 } linux1;
798 struct {
799 __u32 h_i_translator;
800 } hurd1;
801 struct {
802 __u32 m_i_reserved1;
803 } masix1;
804 } osd1; /* OS dependent 1 */
805 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
806 __le32 i_generation; /* File version (for NFS) */
807 __le32 i_file_acl_lo; /* File ACL */
808 __le32 i_size_high;
809 __le32 i_obso_faddr; /* Obsoleted fragment address */
810 union {
811 struct {
812 __le16 l_i_blocks_high; /* were l_i_reserved1 */
813 __le16 l_i_file_acl_high;
814 __le16 l_i_uid_high; /* these 2 fields */
815 __le16 l_i_gid_high; /* were reserved2[0] */
816 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
817 __le16 l_i_reserved;
818 } linux2;
819 struct {
820 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
821 __u16 h_i_mode_high;
822 __u16 h_i_uid_high;
823 __u16 h_i_gid_high;
824 __u32 h_i_author;
825 } hurd2;
826 struct {
827 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
828 __le16 m_i_file_acl_high;
829 __u32 m_i_reserved2[2];
830 } masix2;
831 } osd2; /* OS dependent 2 */
832 __le16 i_extra_isize;
833 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
834 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
835 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
836 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
837 __le32 i_crtime; /* File Creation time */
838 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
839 __le32 i_version_hi; /* high 32 bits for 64-bit version */
840 __le32 i_projid; /* Project ID */
841};
842
843struct move_extent {
844 __u32 reserved; /* should be zero */
845 __u32 donor_fd; /* donor file descriptor */
846 __u64 orig_start; /* logical start offset in block for orig */
847 __u64 donor_start; /* logical start offset in block for donor */
848 __u64 len; /* block length to be moved */
849 __u64 moved_len; /* moved block length */
850};
851
852#define EXT4_EPOCH_BITS 2
853#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
854#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
855
856/*
857 * Extended fields will fit into an inode if the filesystem was formatted
858 * with large inodes (-I 256 or larger) and there are not currently any EAs
859 * consuming all of the available space. For new inodes we always reserve
860 * enough space for the kernel's known extended fields, but for inodes
861 * created with an old kernel this might not have been the case. None of
862 * the extended inode fields is critical for correct filesystem operation.
863 * This macro checks if a certain field fits in the inode. Note that
864 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
865 */
866#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
867 ((offsetof(typeof(*ext4_inode), field) + \
868 sizeof((ext4_inode)->field)) \
869 <= (EXT4_GOOD_OLD_INODE_SIZE + \
870 (einode)->i_extra_isize)) \
871
872/*
873 * We use an encoding that preserves the times for extra epoch "00":
874 *
875 * extra msb of adjust for signed
876 * epoch 32-bit 32-bit tv_sec to
877 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
878 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
879 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
880 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
881 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
882 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
883 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
884 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
885 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
886 *
887 * Note that previous versions of the kernel on 64-bit systems would
888 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
889 * 1970. e2fsck will correct this, assuming that it is run on the
890 * affected filesystem before 2242.
891 */
892
893static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
894{
895 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
896 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
897}
898
899static inline void ext4_decode_extra_time(struct timespec64 *time,
900 __le32 extra)
901{
902 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
903 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
904 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
905}
906
907#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
908do { \
909 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
910 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
911 (raw_inode)->xtime ## _extra = \
912 ext4_encode_extra_time(&(inode)->xtime); \
913 } \
914 else \
915 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
916} while (0)
917
918#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
919do { \
920 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
921 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
922 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
923 (raw_inode)->xtime ## _extra = \
924 ext4_encode_extra_time(&(einode)->xtime); \
925} while (0)
926
927#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
928do { \
929 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
930 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
931 ext4_decode_extra_time(&(inode)->xtime, \
932 raw_inode->xtime ## _extra); \
933 } \
934 else \
935 (inode)->xtime.tv_nsec = 0; \
936} while (0)
937
938
939#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
940do { \
941 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
942 (einode)->xtime.tv_sec = \
943 (signed)le32_to_cpu((raw_inode)->xtime); \
944 else \
945 (einode)->xtime.tv_sec = 0; \
946 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
947 ext4_decode_extra_time(&(einode)->xtime, \
948 raw_inode->xtime ## _extra); \
949 else \
950 (einode)->xtime.tv_nsec = 0; \
951} while (0)
952
953#define i_disk_version osd1.linux1.l_i_version
954
955#if defined(__KERNEL__) || defined(__linux__)
956#define i_reserved1 osd1.linux1.l_i_reserved1
957#define i_file_acl_high osd2.linux2.l_i_file_acl_high
958#define i_blocks_high osd2.linux2.l_i_blocks_high
959#define i_uid_low i_uid
960#define i_gid_low i_gid
961#define i_uid_high osd2.linux2.l_i_uid_high
962#define i_gid_high osd2.linux2.l_i_gid_high
963#define i_checksum_lo osd2.linux2.l_i_checksum_lo
964
965#elif defined(__GNU__)
966
967#define i_translator osd1.hurd1.h_i_translator
968#define i_uid_high osd2.hurd2.h_i_uid_high
969#define i_gid_high osd2.hurd2.h_i_gid_high
970#define i_author osd2.hurd2.h_i_author
971
972#elif defined(__masix__)
973
974#define i_reserved1 osd1.masix1.m_i_reserved1
975#define i_file_acl_high osd2.masix2.m_i_file_acl_high
976#define i_reserved2 osd2.masix2.m_i_reserved2
977
978#endif /* defined(__KERNEL__) || defined(__linux__) */
979
980#include "extents_status.h"
981#include "fast_commit.h"
982
983/*
984 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
985 *
986 * These are needed to avoid lockdep false positives when we need to
987 * allocate blocks to the quota inode during ext4_map_blocks(), while
988 * holding i_data_sem for a normal (non-quota) inode. Since we don't
989 * do quota tracking for the quota inode, this avoids deadlock (as
990 * well as infinite recursion, since it isn't turtles all the way
991 * down...)
992 *
993 * I_DATA_SEM_NORMAL - Used for most inodes
994 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
995 * where the second inode has larger inode number
996 * than the first
997 * I_DATA_SEM_QUOTA - Used for quota inodes only
998 */
999enum {
1000 I_DATA_SEM_NORMAL = 0,
1001 I_DATA_SEM_OTHER,
1002 I_DATA_SEM_QUOTA,
1003};
1004
1005
1006/*
1007 * fourth extended file system inode data in memory
1008 */
1009struct ext4_inode_info {
1010 __le32 i_data[15]; /* unconverted */
1011 __u32 i_dtime;
1012 ext4_fsblk_t i_file_acl;
1013
1014 /*
1015 * i_block_group is the number of the block group which contains
1016 * this file's inode. Constant across the lifetime of the inode,
1017 * it is used for making block allocation decisions - we try to
1018 * place a file's data blocks near its inode block, and new inodes
1019 * near to their parent directory's inode.
1020 */
1021 ext4_group_t i_block_group;
1022 ext4_lblk_t i_dir_start_lookup;
1023#if (BITS_PER_LONG < 64)
1024 unsigned long i_state_flags; /* Dynamic state flags */
1025#endif
1026 unsigned long i_flags;
1027
1028 /*
1029 * Extended attributes can be read independently of the main file
1030 * data. Taking i_mutex even when reading would cause contention
1031 * between readers of EAs and writers of regular file data, so
1032 * instead we synchronize on xattr_sem when reading or changing
1033 * EAs.
1034 */
1035 struct rw_semaphore xattr_sem;
1036
1037 struct list_head i_orphan; /* unlinked but open inodes */
1038
1039 /* Fast commit related info */
1040
1041 struct list_head i_fc_list; /*
1042 * inodes that need fast commit
1043 * protected by sbi->s_fc_lock.
1044 */
1045
1046 /* Start of lblk range that needs to be committed in this fast commit */
1047 ext4_lblk_t i_fc_lblk_start;
1048
1049 /* End of lblk range that needs to be committed in this fast commit */
1050 ext4_lblk_t i_fc_lblk_len;
1051
1052 /* Number of ongoing updates on this inode */
1053 atomic_t i_fc_updates;
1054
1055 /* Fast commit wait queue for this inode */
1056 wait_queue_head_t i_fc_wait;
1057
1058 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1059 struct mutex i_fc_lock;
1060
1061 /*
1062 * i_disksize keeps track of what the inode size is ON DISK, not
1063 * in memory. During truncate, i_size is set to the new size by
1064 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1065 * set i_disksize to 0 until the truncate is actually under way.
1066 *
1067 * The intent is that i_disksize always represents the blocks which
1068 * are used by this file. This allows recovery to restart truncate
1069 * on orphans if we crash during truncate. We actually write i_disksize
1070 * into the on-disk inode when writing inodes out, instead of i_size.
1071 *
1072 * The only time when i_disksize and i_size may be different is when
1073 * a truncate is in progress. The only things which change i_disksize
1074 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1075 */
1076 loff_t i_disksize;
1077
1078 /*
1079 * i_data_sem is for serialising ext4_truncate() against
1080 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1081 * data tree are chopped off during truncate. We can't do that in
1082 * ext4 because whenever we perform intermediate commits during
1083 * truncate, the inode and all the metadata blocks *must* be in a
1084 * consistent state which allows truncation of the orphans to restart
1085 * during recovery. Hence we must fix the get_block-vs-truncate race
1086 * by other means, so we have i_data_sem.
1087 */
1088 struct rw_semaphore i_data_sem;
1089 /*
1090 * i_mmap_sem is for serializing page faults with truncate / punch hole
1091 * operations. We have to make sure that new page cannot be faulted in
1092 * a section of the inode that is being punched. We cannot easily use
1093 * i_data_sem for this since we need protection for the whole punch
1094 * operation and i_data_sem ranks below transaction start so we have
1095 * to occasionally drop it.
1096 */
1097 struct rw_semaphore i_mmap_sem;
1098 struct inode vfs_inode;
1099 struct jbd2_inode *jinode;
1100
1101 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1102
1103 /*
1104 * File creation time. Its function is same as that of
1105 * struct timespec64 i_{a,c,m}time in the generic inode.
1106 */
1107 struct timespec64 i_crtime;
1108
1109 /* mballoc */
1110 atomic_t i_prealloc_active;
1111 struct list_head i_prealloc_list;
1112 spinlock_t i_prealloc_lock;
1113
1114 /* extents status tree */
1115 struct ext4_es_tree i_es_tree;
1116 rwlock_t i_es_lock;
1117 struct list_head i_es_list;
1118 unsigned int i_es_all_nr; /* protected by i_es_lock */
1119 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1120 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1121 extents to shrink. Protected by
1122 i_es_lock */
1123
1124 /* ialloc */
1125 ext4_group_t i_last_alloc_group;
1126
1127 /* allocation reservation info for delalloc */
1128 /* In case of bigalloc, this refer to clusters rather than blocks */
1129 unsigned int i_reserved_data_blocks;
1130
1131 /* pending cluster reservations for bigalloc file systems */
1132 struct ext4_pending_tree i_pending_tree;
1133
1134 /* on-disk additional length */
1135 __u16 i_extra_isize;
1136
1137 /* Indicate the inline data space. */
1138 u16 i_inline_off;
1139 u16 i_inline_size;
1140
1141#ifdef CONFIG_QUOTA
1142 /* quota space reservation, managed internally by quota code */
1143 qsize_t i_reserved_quota;
1144#endif
1145
1146 /* Lock protecting lists below */
1147 spinlock_t i_completed_io_lock;
1148 /*
1149 * Completed IOs that need unwritten extents handling and have
1150 * transaction reserved
1151 */
1152 struct list_head i_rsv_conversion_list;
1153 struct work_struct i_rsv_conversion_work;
1154 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1155
1156 spinlock_t i_block_reservation_lock;
1157
1158 /*
1159 * Transactions that contain inode's metadata needed to complete
1160 * fsync and fdatasync, respectively.
1161 */
1162 tid_t i_sync_tid;
1163 tid_t i_datasync_tid;
1164
1165#ifdef CONFIG_QUOTA
1166 struct dquot *i_dquot[MAXQUOTAS];
1167#endif
1168
1169 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1170 __u32 i_csum_seed;
1171
1172 kprojid_t i_projid;
1173};
1174
1175/*
1176 * File system states
1177 */
1178#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1179#define EXT4_ERROR_FS 0x0002 /* Errors detected */
1180#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1181#define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1182
1183/*
1184 * Misc. filesystem flags
1185 */
1186#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1187#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1188#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1189
1190/*
1191 * Mount flags set via mount options or defaults
1192 */
1193#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1194#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1195#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1196#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1197#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1198#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1199#define EXT4_MOUNT_ERRORS_MASK 0x00070
1200#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1201#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1202#ifdef CONFIG_FS_DAX
1203#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1204#else
1205#define EXT4_MOUNT_DAX_ALWAYS 0
1206#endif
1207#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1208#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1209#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1210#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1211#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1212#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1213#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1214#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1215#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1216#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1217#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1218#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1219 * enable enforcement for hidden
1220 * quota files */
1221#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1222 * enforcement for hidden quota
1223 * files */
1224#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1225 * enforcement */
1226#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1227#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1228#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1229#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1230#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1231#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1232#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1233#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1234#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1235#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1236
1237/*
1238 * Mount flags set either automatically (could not be set by mount option)
1239 * based on per file system feature or property or in special cases such as
1240 * distinguishing between explicit mount option definition and default.
1241 */
1242#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1243 specified delalloc */
1244#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1245 size of blocksize * 8
1246 blocks */
1247#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1248 file systems */
1249#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1250 specified journal checksum */
1251
1252#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1253#define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1254#define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1255#define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1256 * scanning in mballoc
1257 */
1258
1259#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1260 ~EXT4_MOUNT_##opt
1261#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1262 EXT4_MOUNT_##opt
1263#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1264 EXT4_MOUNT_##opt)
1265
1266#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1267 ~EXT4_MOUNT2_##opt
1268#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1269 EXT4_MOUNT2_##opt
1270#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1271 EXT4_MOUNT2_##opt)
1272
1273#define ext4_test_and_set_bit __test_and_set_bit_le
1274#define ext4_set_bit __set_bit_le
1275#define ext4_set_bit_atomic ext2_set_bit_atomic
1276#define ext4_test_and_clear_bit __test_and_clear_bit_le
1277#define ext4_clear_bit __clear_bit_le
1278#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1279#define ext4_test_bit test_bit_le
1280#define ext4_find_next_zero_bit find_next_zero_bit_le
1281#define ext4_find_next_bit find_next_bit_le
1282
1283extern void ext4_set_bits(void *bm, int cur, int len);
1284
1285/*
1286 * Maximal mount counts between two filesystem checks
1287 */
1288#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1289#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1290
1291/*
1292 * Behaviour when detecting errors
1293 */
1294#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1295#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1296#define EXT4_ERRORS_PANIC 3 /* Panic */
1297#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1298
1299/* Metadata checksum algorithm codes */
1300#define EXT4_CRC32C_CHKSUM 1
1301
1302/*
1303 * Structure of the super block
1304 */
1305struct ext4_super_block {
1306/*00*/ __le32 s_inodes_count; /* Inodes count */
1307 __le32 s_blocks_count_lo; /* Blocks count */
1308 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1309 __le32 s_free_blocks_count_lo; /* Free blocks count */
1310/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1311 __le32 s_first_data_block; /* First Data Block */
1312 __le32 s_log_block_size; /* Block size */
1313 __le32 s_log_cluster_size; /* Allocation cluster size */
1314/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1315 __le32 s_clusters_per_group; /* # Clusters per group */
1316 __le32 s_inodes_per_group; /* # Inodes per group */
1317 __le32 s_mtime; /* Mount time */
1318/*30*/ __le32 s_wtime; /* Write time */
1319 __le16 s_mnt_count; /* Mount count */
1320 __le16 s_max_mnt_count; /* Maximal mount count */
1321 __le16 s_magic; /* Magic signature */
1322 __le16 s_state; /* File system state */
1323 __le16 s_errors; /* Behaviour when detecting errors */
1324 __le16 s_minor_rev_level; /* minor revision level */
1325/*40*/ __le32 s_lastcheck; /* time of last check */
1326 __le32 s_checkinterval; /* max. time between checks */
1327 __le32 s_creator_os; /* OS */
1328 __le32 s_rev_level; /* Revision level */
1329/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1330 __le16 s_def_resgid; /* Default gid for reserved blocks */
1331 /*
1332 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1333 *
1334 * Note: the difference between the compatible feature set and
1335 * the incompatible feature set is that if there is a bit set
1336 * in the incompatible feature set that the kernel doesn't
1337 * know about, it should refuse to mount the filesystem.
1338 *
1339 * e2fsck's requirements are more strict; if it doesn't know
1340 * about a feature in either the compatible or incompatible
1341 * feature set, it must abort and not try to meddle with
1342 * things it doesn't understand...
1343 */
1344 __le32 s_first_ino; /* First non-reserved inode */
1345 __le16 s_inode_size; /* size of inode structure */
1346 __le16 s_block_group_nr; /* block group # of this superblock */
1347 __le32 s_feature_compat; /* compatible feature set */
1348/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1349 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1350/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1351/*78*/ char s_volume_name[16]; /* volume name */
1352/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1353/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1354 /*
1355 * Performance hints. Directory preallocation should only
1356 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1357 */
1358 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1359 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1360 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1361 /*
1362 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1363 */
1364/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1365/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1366 __le32 s_journal_dev; /* device number of journal file */
1367 __le32 s_last_orphan; /* start of list of inodes to delete */
1368 __le32 s_hash_seed[4]; /* HTREE hash seed */
1369 __u8 s_def_hash_version; /* Default hash version to use */
1370 __u8 s_jnl_backup_type;
1371 __le16 s_desc_size; /* size of group descriptor */
1372/*100*/ __le32 s_default_mount_opts;
1373 __le32 s_first_meta_bg; /* First metablock block group */
1374 __le32 s_mkfs_time; /* When the filesystem was created */
1375 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1376 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1377/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1378 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1379 __le32 s_free_blocks_count_hi; /* Free blocks count */
1380 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1381 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1382 __le32 s_flags; /* Miscellaneous flags */
1383 __le16 s_raid_stride; /* RAID stride */
1384 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1385 __le64 s_mmp_block; /* Block for multi-mount protection */
1386 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1387 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1388 __u8 s_checksum_type; /* metadata checksum algorithm used */
1389 __u8 s_encryption_level; /* versioning level for encryption */
1390 __u8 s_reserved_pad; /* Padding to next 32bits */
1391 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1392 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1393 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1394 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1395 snapshot's future use */
1396 __le32 s_snapshot_list; /* inode number of the head of the
1397 on-disk snapshot list */
1398#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1399 __le32 s_error_count; /* number of fs errors */
1400 __le32 s_first_error_time; /* first time an error happened */
1401 __le32 s_first_error_ino; /* inode involved in first error */
1402 __le64 s_first_error_block; /* block involved of first error */
1403 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1404 __le32 s_first_error_line; /* line number where error happened */
1405 __le32 s_last_error_time; /* most recent time of an error */
1406 __le32 s_last_error_ino; /* inode involved in last error */
1407 __le32 s_last_error_line; /* line number where error happened */
1408 __le64 s_last_error_block; /* block involved of last error */
1409 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1410#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1411 __u8 s_mount_opts[64];
1412 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1413 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1414 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1415 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1416 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1417 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1418 __le32 s_lpf_ino; /* Location of the lost+found inode */
1419 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1420 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1421 __u8 s_wtime_hi;
1422 __u8 s_mtime_hi;
1423 __u8 s_mkfs_time_hi;
1424 __u8 s_lastcheck_hi;
1425 __u8 s_first_error_time_hi;
1426 __u8 s_last_error_time_hi;
1427 __u8 s_first_error_errcode;
1428 __u8 s_last_error_errcode;
1429 __le16 s_encoding; /* Filename charset encoding */
1430 __le16 s_encoding_flags; /* Filename charset encoding flags */
1431 __le32 s_reserved[95]; /* Padding to the end of the block */
1432 __le32 s_checksum; /* crc32c(superblock) */
1433};
1434
1435#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1436
1437#ifdef __KERNEL__
1438
1439#ifdef CONFIG_FS_ENCRYPTION
1440#define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1441#else
1442#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1443#endif
1444
1445/* Number of quota types we support */
1446#define EXT4_MAXQUOTAS 3
1447
1448#define EXT4_ENC_UTF8_12_1 1
1449
1450/*
1451 * fourth extended-fs super-block data in memory
1452 */
1453struct ext4_sb_info {
1454 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1455 unsigned long s_inodes_per_block;/* Number of inodes per block */
1456 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1457 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1458 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1459 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1460 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1461 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1462 ext4_group_t s_groups_count; /* Number of groups in the fs */
1463 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1464 unsigned long s_overhead; /* # of fs overhead clusters */
1465 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1466 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1467 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1468 struct buffer_head * s_sbh; /* Buffer containing the super block */
1469 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1470 struct buffer_head * __rcu *s_group_desc;
1471 unsigned int s_mount_opt;
1472 unsigned int s_mount_opt2;
1473 unsigned long s_mount_flags;
1474 unsigned int s_def_mount_opt;
1475 ext4_fsblk_t s_sb_block;
1476 atomic64_t s_resv_clusters;
1477 kuid_t s_resuid;
1478 kgid_t s_resgid;
1479 unsigned short s_mount_state;
1480 unsigned short s_pad;
1481 int s_addr_per_block_bits;
1482 int s_desc_per_block_bits;
1483 int s_inode_size;
1484 int s_first_ino;
1485 unsigned int s_inode_readahead_blks;
1486 unsigned int s_inode_goal;
1487 u32 s_hash_seed[4];
1488 int s_def_hash_version;
1489 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1490 struct percpu_counter s_freeclusters_counter;
1491 struct percpu_counter s_freeinodes_counter;
1492 struct percpu_counter s_dirs_counter;
1493 struct percpu_counter s_dirtyclusters_counter;
1494 struct percpu_counter s_sra_exceeded_retry_limit;
1495 struct blockgroup_lock *s_blockgroup_lock;
1496 struct proc_dir_entry *s_proc;
1497 struct kobject s_kobj;
1498 struct completion s_kobj_unregister;
1499 struct super_block *s_sb;
1500 struct buffer_head *s_mmp_bh;
1501
1502 /* Journaling */
1503 struct journal_s *s_journal;
1504 struct list_head s_orphan;
1505 struct mutex s_orphan_lock;
1506 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1507 unsigned long s_commit_interval;
1508 u32 s_max_batch_time;
1509 u32 s_min_batch_time;
1510 struct block_device *s_journal_bdev;
1511#ifdef CONFIG_QUOTA
1512 /* Names of quota files with journalled quota */
1513 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1514 int s_jquota_fmt; /* Format of quota to use */
1515#endif
1516 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1517 struct ext4_system_blocks __rcu *s_system_blks;
1518
1519#ifdef EXTENTS_STATS
1520 /* ext4 extents stats */
1521 unsigned long s_ext_min;
1522 unsigned long s_ext_max;
1523 unsigned long s_depth_max;
1524 spinlock_t s_ext_stats_lock;
1525 unsigned long s_ext_blocks;
1526 unsigned long s_ext_extents;
1527#endif
1528
1529 /* for buddy allocator */
1530 struct ext4_group_info ** __rcu *s_group_info;
1531 struct inode *s_buddy_cache;
1532 spinlock_t s_md_lock;
1533 unsigned short *s_mb_offsets;
1534 unsigned int *s_mb_maxs;
1535 unsigned int s_group_info_size;
1536 unsigned int s_mb_free_pending;
1537 struct list_head s_freed_data_list; /* List of blocks to be freed
1538 after commit completed */
1539 struct rb_root s_mb_avg_fragment_size_root;
1540 rwlock_t s_mb_rb_lock;
1541 struct list_head *s_mb_largest_free_orders;
1542 rwlock_t *s_mb_largest_free_orders_locks;
1543
1544 /* tunables */
1545 unsigned long s_stripe;
1546 unsigned int s_mb_max_linear_groups;
1547 unsigned int s_mb_stream_request;
1548 unsigned int s_mb_max_to_scan;
1549 unsigned int s_mb_min_to_scan;
1550 unsigned int s_mb_stats;
1551 unsigned int s_mb_order2_reqs;
1552 unsigned int s_mb_group_prealloc;
1553 unsigned int s_mb_max_inode_prealloc;
1554 unsigned int s_max_dir_size_kb;
1555 /* where last allocation was done - for stream allocation */
1556 unsigned long s_mb_last_group;
1557 unsigned long s_mb_last_start;
1558 unsigned int s_mb_prefetch;
1559 unsigned int s_mb_prefetch_limit;
1560
1561 /* stats for buddy allocator */
1562 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1563 atomic_t s_bal_success; /* we found long enough chunks */
1564 atomic_t s_bal_allocated; /* in blocks */
1565 atomic_t s_bal_ex_scanned; /* total extents scanned */
1566 atomic_t s_bal_groups_scanned; /* number of groups scanned */
1567 atomic_t s_bal_goals; /* goal hits */
1568 atomic_t s_bal_breaks; /* too long searches */
1569 atomic_t s_bal_2orders; /* 2^order hits */
1570 atomic_t s_bal_cr0_bad_suggestions;
1571 atomic_t s_bal_cr1_bad_suggestions;
1572 atomic64_t s_bal_cX_groups_considered[4];
1573 atomic64_t s_bal_cX_hits[4];
1574 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */
1575 atomic_t s_mb_buddies_generated; /* number of buddies generated */
1576 atomic64_t s_mb_generation_time;
1577 atomic_t s_mb_lost_chunks;
1578 atomic_t s_mb_preallocated;
1579 atomic_t s_mb_discarded;
1580 atomic_t s_lock_busy;
1581
1582 /* locality groups */
1583 struct ext4_locality_group __percpu *s_locality_groups;
1584
1585 /* for write statistics */
1586 unsigned long s_sectors_written_start;
1587 u64 s_kbytes_written;
1588
1589 /* the size of zero-out chunk */
1590 unsigned int s_extent_max_zeroout_kb;
1591
1592 unsigned int s_log_groups_per_flex;
1593 struct flex_groups * __rcu *s_flex_groups;
1594 ext4_group_t s_flex_groups_allocated;
1595
1596 /* workqueue for reserved extent conversions (buffered io) */
1597 struct workqueue_struct *rsv_conversion_wq;
1598
1599 /* timer for periodic error stats printing */
1600 struct timer_list s_err_report;
1601
1602 /* Lazy inode table initialization info */
1603 struct ext4_li_request *s_li_request;
1604 /* Wait multiplier for lazy initialization thread */
1605 unsigned int s_li_wait_mult;
1606
1607 /* Kernel thread for multiple mount protection */
1608 struct task_struct *s_mmp_tsk;
1609
1610 /* record the last minlen when FITRIM is called. */
1611 atomic_t s_last_trim_minblks;
1612
1613 /* Reference to checksum algorithm driver via cryptoapi */
1614 struct crypto_shash *s_chksum_driver;
1615
1616 /* Precomputed FS UUID checksum for seeding other checksums */
1617 __u32 s_csum_seed;
1618
1619 /* Reclaim extents from extent status tree */
1620 struct shrinker s_es_shrinker;
1621 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1622 long s_es_nr_inode;
1623 struct ext4_es_stats s_es_stats;
1624 struct mb_cache *s_ea_block_cache;
1625 struct mb_cache *s_ea_inode_cache;
1626 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1627
1628 /* Ratelimit ext4 messages. */
1629 struct ratelimit_state s_err_ratelimit_state;
1630 struct ratelimit_state s_warning_ratelimit_state;
1631 struct ratelimit_state s_msg_ratelimit_state;
1632 atomic_t s_warning_count;
1633 atomic_t s_msg_count;
1634
1635 /* Encryption policy for '-o test_dummy_encryption' */
1636 struct fscrypt_dummy_policy s_dummy_enc_policy;
1637
1638 /*
1639 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1640 * or EXTENTS flag.
1641 */
1642 struct percpu_rw_semaphore s_writepages_rwsem;
1643 struct dax_device *s_daxdev;
1644#ifdef CONFIG_EXT4_DEBUG
1645 unsigned long s_simulate_fail;
1646#endif
1647 /* Record the errseq of the backing block device */
1648 errseq_t s_bdev_wb_err;
1649 spinlock_t s_bdev_wb_lock;
1650
1651 /* Information about errors that happened during this mount */
1652 spinlock_t s_error_lock;
1653 int s_add_error_count;
1654 int s_first_error_code;
1655 __u32 s_first_error_line;
1656 __u32 s_first_error_ino;
1657 __u64 s_first_error_block;
1658 const char *s_first_error_func;
1659 time64_t s_first_error_time;
1660 int s_last_error_code;
1661 __u32 s_last_error_line;
1662 __u32 s_last_error_ino;
1663 __u64 s_last_error_block;
1664 const char *s_last_error_func;
1665 time64_t s_last_error_time;
1666 /*
1667 * If we are in a context where we cannot update error information in
1668 * the on-disk superblock, we queue this work to do it.
1669 */
1670 struct work_struct s_error_work;
1671
1672 /* Ext4 fast commit stuff */
1673 atomic_t s_fc_subtid;
1674 atomic_t s_fc_ineligible_updates;
1675 /*
1676 * After commit starts, the main queue gets locked, and the further
1677 * updates get added in the staging queue.
1678 */
1679#define FC_Q_MAIN 0
1680#define FC_Q_STAGING 1
1681 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1682 * that have data changes in them.
1683 */
1684 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1685 unsigned int s_fc_bytes;
1686 /*
1687 * Main fast commit lock. This lock protects accesses to the
1688 * following fields:
1689 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1690 */
1691 spinlock_t s_fc_lock;
1692 struct buffer_head *s_fc_bh;
1693 struct ext4_fc_stats s_fc_stats;
1694 u64 s_fc_avg_commit_time;
1695#ifdef CONFIG_EXT4_DEBUG
1696 int s_fc_debug_max_replay;
1697#endif
1698 struct ext4_fc_replay_state s_fc_replay_state;
1699};
1700
1701static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1702{
1703 return sb->s_fs_info;
1704}
1705static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1706{
1707 return container_of(inode, struct ext4_inode_info, vfs_inode);
1708}
1709
1710static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1711{
1712 return ino == EXT4_ROOT_INO ||
1713 (ino >= EXT4_FIRST_INO(sb) &&
1714 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1715}
1716
1717/*
1718 * Returns: sbi->field[index]
1719 * Used to access an array element from the following sbi fields which require
1720 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1721 * - s_group_desc
1722 * - s_group_info
1723 * - s_flex_group
1724 */
1725#define sbi_array_rcu_deref(sbi, field, index) \
1726({ \
1727 typeof(*((sbi)->field)) _v; \
1728 rcu_read_lock(); \
1729 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1730 rcu_read_unlock(); \
1731 _v; \
1732})
1733
1734/*
1735 * run-time mount flags
1736 */
1737enum {
1738 EXT4_MF_MNTDIR_SAMPLED,
1739 EXT4_MF_FS_ABORTED, /* Fatal error detected */
1740 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */
1741 EXT4_MF_FC_COMMITTING /* File system underoing a fast
1742 * commit.
1743 */
1744};
1745
1746static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1747{
1748 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1749}
1750
1751static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1752{
1753 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1754}
1755
1756static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1757{
1758 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1759}
1760
1761
1762/*
1763 * Simulate_fail codes
1764 */
1765#define EXT4_SIM_BBITMAP_EIO 1
1766#define EXT4_SIM_BBITMAP_CRC 2
1767#define EXT4_SIM_IBITMAP_EIO 3
1768#define EXT4_SIM_IBITMAP_CRC 4
1769#define EXT4_SIM_INODE_EIO 5
1770#define EXT4_SIM_INODE_CRC 6
1771#define EXT4_SIM_DIRBLOCK_EIO 7
1772#define EXT4_SIM_DIRBLOCK_CRC 8
1773
1774static inline bool ext4_simulate_fail(struct super_block *sb,
1775 unsigned long code)
1776{
1777#ifdef CONFIG_EXT4_DEBUG
1778 struct ext4_sb_info *sbi = EXT4_SB(sb);
1779
1780 if (unlikely(sbi->s_simulate_fail == code)) {
1781 sbi->s_simulate_fail = 0;
1782 return true;
1783 }
1784#endif
1785 return false;
1786}
1787
1788static inline void ext4_simulate_fail_bh(struct super_block *sb,
1789 struct buffer_head *bh,
1790 unsigned long code)
1791{
1792 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1793 clear_buffer_uptodate(bh);
1794}
1795
1796/*
1797 * Error number codes for s_{first,last}_error_errno
1798 *
1799 * Linux errno numbers are architecture specific, so we need to translate
1800 * them into something which is architecture independent. We don't define
1801 * codes for all errno's; just the ones which are most likely to be the cause
1802 * of an ext4_error() call.
1803 */
1804#define EXT4_ERR_UNKNOWN 1
1805#define EXT4_ERR_EIO 2
1806#define EXT4_ERR_ENOMEM 3
1807#define EXT4_ERR_EFSBADCRC 4
1808#define EXT4_ERR_EFSCORRUPTED 5
1809#define EXT4_ERR_ENOSPC 6
1810#define EXT4_ERR_ENOKEY 7
1811#define EXT4_ERR_EROFS 8
1812#define EXT4_ERR_EFBIG 9
1813#define EXT4_ERR_EEXIST 10
1814#define EXT4_ERR_ERANGE 11
1815#define EXT4_ERR_EOVERFLOW 12
1816#define EXT4_ERR_EBUSY 13
1817#define EXT4_ERR_ENOTDIR 14
1818#define EXT4_ERR_ENOTEMPTY 15
1819#define EXT4_ERR_ESHUTDOWN 16
1820#define EXT4_ERR_EFAULT 17
1821
1822/*
1823 * Inode dynamic state flags
1824 */
1825enum {
1826 EXT4_STATE_JDATA, /* journaled data exists */
1827 EXT4_STATE_NEW, /* inode is newly created */
1828 EXT4_STATE_XATTR, /* has in-inode xattrs */
1829 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1830 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1831 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1832 EXT4_STATE_NEWENTRY, /* File just added to dir */
1833 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1834 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1835 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1836 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1837 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1838};
1839
1840#define EXT4_INODE_BIT_FNS(name, field, offset) \
1841static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1842{ \
1843 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1844} \
1845static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1846{ \
1847 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1848} \
1849static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1850{ \
1851 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1852}
1853
1854/* Add these declarations here only so that these functions can be
1855 * found by name. Otherwise, they are very hard to locate. */
1856static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1857static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1858static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1859EXT4_INODE_BIT_FNS(flag, flags, 0)
1860
1861/* Add these declarations here only so that these functions can be
1862 * found by name. Otherwise, they are very hard to locate. */
1863static inline int ext4_test_inode_state(struct inode *inode, int bit);
1864static inline void ext4_set_inode_state(struct inode *inode, int bit);
1865static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1866#if (BITS_PER_LONG < 64)
1867EXT4_INODE_BIT_FNS(state, state_flags, 0)
1868
1869static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1870{
1871 (ei)->i_state_flags = 0;
1872}
1873#else
1874EXT4_INODE_BIT_FNS(state, flags, 32)
1875
1876static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1877{
1878 /* We depend on the fact that callers will set i_flags */
1879}
1880#endif
1881#else
1882/* Assume that user mode programs are passing in an ext4fs superblock, not
1883 * a kernel struct super_block. This will allow us to call the feature-test
1884 * macros from user land. */
1885#define EXT4_SB(sb) (sb)
1886#endif
1887
1888static inline bool ext4_verity_in_progress(struct inode *inode)
1889{
1890 return IS_ENABLED(CONFIG_FS_VERITY) &&
1891 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1892}
1893
1894#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1895
1896/*
1897 * Codes for operating systems
1898 */
1899#define EXT4_OS_LINUX 0
1900#define EXT4_OS_HURD 1
1901#define EXT4_OS_MASIX 2
1902#define EXT4_OS_FREEBSD 3
1903#define EXT4_OS_LITES 4
1904
1905/*
1906 * Revision levels
1907 */
1908#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1909#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1910
1911#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1912
1913#define EXT4_GOOD_OLD_INODE_SIZE 128
1914
1915#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1916#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1917#define EXT4_TIMESTAMP_MIN S32_MIN
1918
1919/*
1920 * Feature set definitions
1921 */
1922
1923#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1924#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1925#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1926#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1927#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1928#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1929#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1930/*
1931 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1932 * incompatible only if fast commit blocks are present in the FS. Since we
1933 * clear the journal (and thus the fast commit blocks), we don't mark FS as
1934 * incompatible. We also have a JBD2 incompat feature, which gets set when
1935 * there are fast commit blocks present in the journal.
1936 */
1937#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
1938#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1939
1940#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1941#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1942#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1943#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1944#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1945#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1946#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1947#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1948#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1949/*
1950 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1951 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1952 * all other data structures' checksums. However, the METADATA_CSUM and
1953 * GDT_CSUM bits are mutually exclusive.
1954 */
1955#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1956#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1957#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1958#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
1959
1960#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1961#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1962#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1963#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1964#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1965#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1966#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1967#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1968#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1969#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1970#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1971#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1972#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1973#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1974#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1975#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
1976
1977extern void ext4_update_dynamic_rev(struct super_block *sb);
1978
1979#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1980static inline bool ext4_has_feature_##name(struct super_block *sb) \
1981{ \
1982 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1983 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1984} \
1985static inline void ext4_set_feature_##name(struct super_block *sb) \
1986{ \
1987 ext4_update_dynamic_rev(sb); \
1988 EXT4_SB(sb)->s_es->s_feature_compat |= \
1989 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1990} \
1991static inline void ext4_clear_feature_##name(struct super_block *sb) \
1992{ \
1993 EXT4_SB(sb)->s_es->s_feature_compat &= \
1994 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1995}
1996
1997#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1998static inline bool ext4_has_feature_##name(struct super_block *sb) \
1999{ \
2000 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2001 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2002} \
2003static inline void ext4_set_feature_##name(struct super_block *sb) \
2004{ \
2005 ext4_update_dynamic_rev(sb); \
2006 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2007 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2008} \
2009static inline void ext4_clear_feature_##name(struct super_block *sb) \
2010{ \
2011 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2012 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2013}
2014
2015#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2016static inline bool ext4_has_feature_##name(struct super_block *sb) \
2017{ \
2018 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2019 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2020} \
2021static inline void ext4_set_feature_##name(struct super_block *sb) \
2022{ \
2023 ext4_update_dynamic_rev(sb); \
2024 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2025 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2026} \
2027static inline void ext4_clear_feature_##name(struct super_block *sb) \
2028{ \
2029 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2030 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2031}
2032
2033EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2034EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2035EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2036EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2037EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2038EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2039EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2040EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2041EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2042
2043EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2044EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2045EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2046EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2047EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2048EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2049EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2050EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2051EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2052EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2053EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2054EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2055EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2056
2057EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2058EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2059EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2060EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2061EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2062EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2063EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2064EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2065EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2066EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2067EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2068EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2069EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2070EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2071EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2072EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2073
2074#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2075#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2076 EXT4_FEATURE_INCOMPAT_META_BG)
2077#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2078 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2079 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2080
2081#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2082#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2083 EXT4_FEATURE_INCOMPAT_RECOVER| \
2084 EXT4_FEATURE_INCOMPAT_META_BG)
2085#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2086 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2087 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2088
2089#define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2090#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2091 EXT4_FEATURE_INCOMPAT_RECOVER| \
2092 EXT4_FEATURE_INCOMPAT_META_BG| \
2093 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2094 EXT4_FEATURE_INCOMPAT_64BIT| \
2095 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2096 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2097 EXT4_FEATURE_INCOMPAT_MMP | \
2098 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2099 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2100 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2101 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2102 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2103#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2104 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2105 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2106 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2107 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2108 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2109 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2110 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2111 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2112 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2113 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2114 EXT4_FEATURE_RO_COMPAT_VERITY)
2115
2116#define EXTN_FEATURE_FUNCS(ver) \
2117static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2118{ \
2119 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2120 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2121} \
2122static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2123{ \
2124 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2125 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2126} \
2127static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2128{ \
2129 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2130 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2131}
2132
2133EXTN_FEATURE_FUNCS(2)
2134EXTN_FEATURE_FUNCS(3)
2135EXTN_FEATURE_FUNCS(4)
2136
2137static inline bool ext4_has_compat_features(struct super_block *sb)
2138{
2139 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2140}
2141static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2142{
2143 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2144}
2145static inline bool ext4_has_incompat_features(struct super_block *sb)
2146{
2147 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2148}
2149
2150/*
2151 * Superblock flags
2152 */
2153#define EXT4_FLAGS_RESIZING 0
2154#define EXT4_FLAGS_SHUTDOWN 1
2155#define EXT4_FLAGS_BDEV_IS_DAX 2
2156
2157static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2158{
2159 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2160}
2161
2162
2163/*
2164 * Default values for user and/or group using reserved blocks
2165 */
2166#define EXT4_DEF_RESUID 0
2167#define EXT4_DEF_RESGID 0
2168
2169/*
2170 * Default project ID
2171 */
2172#define EXT4_DEF_PROJID 0
2173
2174#define EXT4_DEF_INODE_READAHEAD_BLKS 32
2175
2176/*
2177 * Default mount options
2178 */
2179#define EXT4_DEFM_DEBUG 0x0001
2180#define EXT4_DEFM_BSDGROUPS 0x0002
2181#define EXT4_DEFM_XATTR_USER 0x0004
2182#define EXT4_DEFM_ACL 0x0008
2183#define EXT4_DEFM_UID16 0x0010
2184#define EXT4_DEFM_JMODE 0x0060
2185#define EXT4_DEFM_JMODE_DATA 0x0020
2186#define EXT4_DEFM_JMODE_ORDERED 0x0040
2187#define EXT4_DEFM_JMODE_WBACK 0x0060
2188#define EXT4_DEFM_NOBARRIER 0x0100
2189#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2190#define EXT4_DEFM_DISCARD 0x0400
2191#define EXT4_DEFM_NODELALLOC 0x0800
2192
2193/*
2194 * Default journal batch times
2195 */
2196#define EXT4_DEF_MIN_BATCH_TIME 0
2197#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2198
2199/*
2200 * Minimum number of groups in a flexgroup before we separate out
2201 * directories into the first block group of a flexgroup
2202 */
2203#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2204
2205/*
2206 * Structure of a directory entry
2207 */
2208#define EXT4_NAME_LEN 255
2209
2210struct ext4_dir_entry {
2211 __le32 inode; /* Inode number */
2212 __le16 rec_len; /* Directory entry length */
2213 __le16 name_len; /* Name length */
2214 char name[EXT4_NAME_LEN]; /* File name */
2215};
2216
2217
2218/*
2219 * Encrypted Casefolded entries require saving the hash on disk. This structure
2220 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2221 * boundary.
2222 */
2223struct ext4_dir_entry_hash {
2224 __le32 hash;
2225 __le32 minor_hash;
2226};
2227
2228/*
2229 * The new version of the directory entry. Since EXT4 structures are
2230 * stored in intel byte order, and the name_len field could never be
2231 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2232 * file_type field.
2233 */
2234struct ext4_dir_entry_2 {
2235 __le32 inode; /* Inode number */
2236 __le16 rec_len; /* Directory entry length */
2237 __u8 name_len; /* Name length */
2238 __u8 file_type; /* See file type macros EXT4_FT_* below */
2239 char name[EXT4_NAME_LEN]; /* File name */
2240};
2241
2242/*
2243 * Access the hashes at the end of ext4_dir_entry_2
2244 */
2245#define EXT4_DIRENT_HASHES(entry) \
2246 ((struct ext4_dir_entry_hash *) \
2247 (((void *)(entry)) + \
2248 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2249#define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2250#define EXT4_DIRENT_MINOR_HASH(entry) \
2251 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2252
2253static inline bool ext4_hash_in_dirent(const struct inode *inode)
2254{
2255 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2256}
2257
2258/*
2259 * This is a bogus directory entry at the end of each leaf block that
2260 * records checksums.
2261 */
2262struct ext4_dir_entry_tail {
2263 __le32 det_reserved_zero1; /* Pretend to be unused */
2264 __le16 det_rec_len; /* 12 */
2265 __u8 det_reserved_zero2; /* Zero name length */
2266 __u8 det_reserved_ft; /* 0xDE, fake file type */
2267 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2268};
2269
2270#define EXT4_DIRENT_TAIL(block, blocksize) \
2271 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2272 ((blocksize) - \
2273 sizeof(struct ext4_dir_entry_tail))))
2274
2275/*
2276 * Ext4 directory file types. Only the low 3 bits are used. The
2277 * other bits are reserved for now.
2278 */
2279#define EXT4_FT_UNKNOWN 0
2280#define EXT4_FT_REG_FILE 1
2281#define EXT4_FT_DIR 2
2282#define EXT4_FT_CHRDEV 3
2283#define EXT4_FT_BLKDEV 4
2284#define EXT4_FT_FIFO 5
2285#define EXT4_FT_SOCK 6
2286#define EXT4_FT_SYMLINK 7
2287
2288#define EXT4_FT_MAX 8
2289
2290#define EXT4_FT_DIR_CSUM 0xDE
2291
2292/*
2293 * EXT4_DIR_PAD defines the directory entries boundaries
2294 *
2295 * NOTE: It must be a multiple of 4
2296 */
2297#define EXT4_DIR_PAD 4
2298#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2299#define EXT4_MAX_REC_LEN ((1<<16)-1)
2300
2301/*
2302 * The rec_len is dependent on the type of directory. Directories that are
2303 * casefolded and encrypted need to store the hash as well, so we add room for
2304 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2305 * pass NULL for dir, as those entries do not use the extra fields.
2306 */
2307static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2308 const struct inode *dir)
2309{
2310 int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2311
2312 if (dir && ext4_hash_in_dirent(dir))
2313 rec_len += sizeof(struct ext4_dir_entry_hash);
2314 return (rec_len & ~EXT4_DIR_ROUND);
2315}
2316
2317/*
2318 * If we ever get support for fs block sizes > page_size, we'll need
2319 * to remove the #if statements in the next two functions...
2320 */
2321static inline unsigned int
2322ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2323{
2324 unsigned len = le16_to_cpu(dlen);
2325
2326#if (PAGE_SIZE >= 65536)
2327 if (len == EXT4_MAX_REC_LEN || len == 0)
2328 return blocksize;
2329 return (len & 65532) | ((len & 3) << 16);
2330#else
2331 return len;
2332#endif
2333}
2334
2335static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2336{
2337 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2338 BUG();
2339#if (PAGE_SIZE >= 65536)
2340 if (len < 65536)
2341 return cpu_to_le16(len);
2342 if (len == blocksize) {
2343 if (blocksize == 65536)
2344 return cpu_to_le16(EXT4_MAX_REC_LEN);
2345 else
2346 return cpu_to_le16(0);
2347 }
2348 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2349#else
2350 return cpu_to_le16(len);
2351#endif
2352}
2353
2354/*
2355 * Hash Tree Directory indexing
2356 * (c) Daniel Phillips, 2001
2357 */
2358
2359#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2360 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2361#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2362 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2363#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2364
2365/* Legal values for the dx_root hash_version field: */
2366
2367#define DX_HASH_LEGACY 0
2368#define DX_HASH_HALF_MD4 1
2369#define DX_HASH_TEA 2
2370#define DX_HASH_LEGACY_UNSIGNED 3
2371#define DX_HASH_HALF_MD4_UNSIGNED 4
2372#define DX_HASH_TEA_UNSIGNED 5
2373#define DX_HASH_SIPHASH 6
2374
2375static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2376 const void *address, unsigned int length)
2377{
2378 struct {
2379 struct shash_desc shash;
2380 char ctx[4];
2381 } desc;
2382
2383 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2384
2385 desc.shash.tfm = sbi->s_chksum_driver;
2386 *(u32 *)desc.ctx = crc;
2387
2388 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2389
2390 return *(u32 *)desc.ctx;
2391}
2392
2393#ifdef __KERNEL__
2394
2395/* hash info structure used by the directory hash */
2396struct dx_hash_info
2397{
2398 u32 hash;
2399 u32 minor_hash;
2400 int hash_version;
2401 u32 *seed;
2402};
2403
2404
2405/* 32 and 64 bit signed EOF for dx directories */
2406#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2407#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2408
2409
2410/*
2411 * Control parameters used by ext4_htree_next_block
2412 */
2413#define HASH_NB_ALWAYS 1
2414
2415struct ext4_filename {
2416 const struct qstr *usr_fname;
2417 struct fscrypt_str disk_name;
2418 struct dx_hash_info hinfo;
2419#ifdef CONFIG_FS_ENCRYPTION
2420 struct fscrypt_str crypto_buf;
2421#endif
2422#ifdef CONFIG_UNICODE
2423 struct fscrypt_str cf_name;
2424#endif
2425};
2426
2427#define fname_name(p) ((p)->disk_name.name)
2428#define fname_usr_name(p) ((p)->usr_fname->name)
2429#define fname_len(p) ((p)->disk_name.len)
2430
2431/*
2432 * Describe an inode's exact location on disk and in memory
2433 */
2434struct ext4_iloc
2435{
2436 struct buffer_head *bh;
2437 unsigned long offset;
2438 ext4_group_t block_group;
2439};
2440
2441static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2442{
2443 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2444}
2445
2446static inline bool ext4_is_quota_file(struct inode *inode)
2447{
2448 return IS_NOQUOTA(inode) &&
2449 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2450}
2451
2452/*
2453 * This structure is stuffed into the struct file's private_data field
2454 * for directories. It is where we put information so that we can do
2455 * readdir operations in hash tree order.
2456 */
2457struct dir_private_info {
2458 struct rb_root root;
2459 struct rb_node *curr_node;
2460 struct fname *extra_fname;
2461 loff_t last_pos;
2462 __u32 curr_hash;
2463 __u32 curr_minor_hash;
2464 __u32 next_hash;
2465};
2466
2467/* calculate the first block number of the group */
2468static inline ext4_fsblk_t
2469ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2470{
2471 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2472 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2473}
2474
2475/*
2476 * Special error return code only used by dx_probe() and its callers.
2477 */
2478#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2479
2480/* htree levels for ext4 */
2481#define EXT4_HTREE_LEVEL_COMPAT 2
2482#define EXT4_HTREE_LEVEL 3
2483
2484static inline int ext4_dir_htree_level(struct super_block *sb)
2485{
2486 return ext4_has_feature_largedir(sb) ?
2487 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2488}
2489
2490/*
2491 * Timeout and state flag for lazy initialization inode thread.
2492 */
2493#define EXT4_DEF_LI_WAIT_MULT 10
2494#define EXT4_DEF_LI_MAX_START_DELAY 5
2495#define EXT4_LAZYINIT_QUIT 0x0001
2496#define EXT4_LAZYINIT_RUNNING 0x0002
2497
2498/*
2499 * Lazy inode table initialization info
2500 */
2501struct ext4_lazy_init {
2502 unsigned long li_state;
2503 struct list_head li_request_list;
2504 struct mutex li_list_mtx;
2505};
2506
2507enum ext4_li_mode {
2508 EXT4_LI_MODE_PREFETCH_BBITMAP,
2509 EXT4_LI_MODE_ITABLE,
2510};
2511
2512struct ext4_li_request {
2513 struct super_block *lr_super;
2514 enum ext4_li_mode lr_mode;
2515 ext4_group_t lr_first_not_zeroed;
2516 ext4_group_t lr_next_group;
2517 struct list_head lr_request;
2518 unsigned long lr_next_sched;
2519 unsigned long lr_timeout;
2520};
2521
2522struct ext4_features {
2523 struct kobject f_kobj;
2524 struct completion f_kobj_unregister;
2525};
2526
2527/*
2528 * This structure will be used for multiple mount protection. It will be
2529 * written into the block number saved in the s_mmp_block field in the
2530 * superblock. Programs that check MMP should assume that if
2531 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2532 * to use the filesystem, regardless of how old the timestamp is.
2533 */
2534#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2535#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2536#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2537#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2538
2539struct mmp_struct {
2540 __le32 mmp_magic; /* Magic number for MMP */
2541 __le32 mmp_seq; /* Sequence no. updated periodically */
2542
2543 /*
2544 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2545 * purposes and do not affect the correctness of the algorithm
2546 */
2547 __le64 mmp_time; /* Time last updated */
2548 char mmp_nodename[64]; /* Node which last updated MMP block */
2549 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2550
2551 /*
2552 * mmp_check_interval is used to verify if the MMP block has been
2553 * updated on the block device. The value is updated based on the
2554 * maximum time to write the MMP block during an update cycle.
2555 */
2556 __le16 mmp_check_interval;
2557
2558 __le16 mmp_pad1;
2559 __le32 mmp_pad2[226];
2560 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2561};
2562
2563/* arguments passed to the mmp thread */
2564struct mmpd_data {
2565 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2566 struct super_block *sb; /* super block of the fs */
2567};
2568
2569/*
2570 * Check interval multiplier
2571 * The MMP block is written every update interval and initially checked every
2572 * update interval x the multiplier (the value is then adapted based on the
2573 * write latency). The reason is that writes can be delayed under load and we
2574 * don't want readers to incorrectly assume that the filesystem is no longer
2575 * in use.
2576 */
2577#define EXT4_MMP_CHECK_MULT 2UL
2578
2579/*
2580 * Minimum interval for MMP checking in seconds.
2581 */
2582#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2583
2584/*
2585 * Maximum interval for MMP checking in seconds.
2586 */
2587#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2588
2589/*
2590 * Function prototypes
2591 */
2592
2593/*
2594 * Ok, these declarations are also in <linux/kernel.h> but none of the
2595 * ext4 source programs needs to include it so they are duplicated here.
2596 */
2597# define NORET_TYPE /**/
2598# define ATTRIB_NORET __attribute__((noreturn))
2599# define NORET_AND noreturn,
2600
2601/* bitmap.c */
2602extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2603void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2604 struct ext4_group_desc *gdp,
2605 struct buffer_head *bh, int sz);
2606int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2607 struct ext4_group_desc *gdp,
2608 struct buffer_head *bh, int sz);
2609void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2610 struct ext4_group_desc *gdp,
2611 struct buffer_head *bh);
2612int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2613 struct ext4_group_desc *gdp,
2614 struct buffer_head *bh);
2615
2616/* balloc.c */
2617extern void ext4_get_group_no_and_offset(struct super_block *sb,
2618 ext4_fsblk_t blocknr,
2619 ext4_group_t *blockgrpp,
2620 ext4_grpblk_t *offsetp);
2621extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2622 ext4_fsblk_t block);
2623
2624extern unsigned int ext4_block_group(struct super_block *sb,
2625 ext4_fsblk_t blocknr);
2626extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2627 ext4_fsblk_t blocknr);
2628extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2629extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2630 ext4_group_t group);
2631extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2632 ext4_fsblk_t goal,
2633 unsigned int flags,
2634 unsigned long *count,
2635 int *errp);
2636extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2637 s64 nclusters, unsigned int flags);
2638extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2639extern void ext4_check_blocks_bitmap(struct super_block *);
2640extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2641 ext4_group_t block_group,
2642 struct buffer_head ** bh);
2643extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2644
2645extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2646 ext4_group_t block_group,
2647 bool ignore_locked);
2648extern int ext4_wait_block_bitmap(struct super_block *sb,
2649 ext4_group_t block_group,
2650 struct buffer_head *bh);
2651extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2652 ext4_group_t block_group);
2653extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2654 ext4_group_t block_group,
2655 struct ext4_group_desc *gdp);
2656ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2657
2658#ifdef CONFIG_UNICODE
2659extern int ext4_fname_setup_ci_filename(struct inode *dir,
2660 const struct qstr *iname,
2661 struct ext4_filename *fname);
2662#endif
2663
2664#ifdef CONFIG_FS_ENCRYPTION
2665static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2666 const struct fscrypt_name *src)
2667{
2668 memset(dst, 0, sizeof(*dst));
2669
2670 dst->usr_fname = src->usr_fname;
2671 dst->disk_name = src->disk_name;
2672 dst->hinfo.hash = src->hash;
2673 dst->hinfo.minor_hash = src->minor_hash;
2674 dst->crypto_buf = src->crypto_buf;
2675}
2676
2677static inline int ext4_fname_setup_filename(struct inode *dir,
2678 const struct qstr *iname,
2679 int lookup,
2680 struct ext4_filename *fname)
2681{
2682 struct fscrypt_name name;
2683 int err;
2684
2685 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2686 if (err)
2687 return err;
2688
2689 ext4_fname_from_fscrypt_name(fname, &name);
2690
2691#ifdef CONFIG_UNICODE
2692 err = ext4_fname_setup_ci_filename(dir, iname, fname);
2693#endif
2694 return err;
2695}
2696
2697static inline int ext4_fname_prepare_lookup(struct inode *dir,
2698 struct dentry *dentry,
2699 struct ext4_filename *fname)
2700{
2701 struct fscrypt_name name;
2702 int err;
2703
2704 err = fscrypt_prepare_lookup(dir, dentry, &name);
2705 if (err)
2706 return err;
2707
2708 ext4_fname_from_fscrypt_name(fname, &name);
2709
2710#ifdef CONFIG_UNICODE
2711 err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname);
2712#endif
2713 return err;
2714}
2715
2716static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2717{
2718 struct fscrypt_name name;
2719
2720 name.crypto_buf = fname->crypto_buf;
2721 fscrypt_free_filename(&name);
2722
2723 fname->crypto_buf.name = NULL;
2724 fname->usr_fname = NULL;
2725 fname->disk_name.name = NULL;
2726
2727#ifdef CONFIG_UNICODE
2728 kfree(fname->cf_name.name);
2729 fname->cf_name.name = NULL;
2730#endif
2731}
2732#else /* !CONFIG_FS_ENCRYPTION */
2733static inline int ext4_fname_setup_filename(struct inode *dir,
2734 const struct qstr *iname,
2735 int lookup,
2736 struct ext4_filename *fname)
2737{
2738 int err = 0;
2739 fname->usr_fname = iname;
2740 fname->disk_name.name = (unsigned char *) iname->name;
2741 fname->disk_name.len = iname->len;
2742
2743#ifdef CONFIG_UNICODE
2744 err = ext4_fname_setup_ci_filename(dir, iname, fname);
2745#endif
2746
2747 return err;
2748}
2749
2750static inline int ext4_fname_prepare_lookup(struct inode *dir,
2751 struct dentry *dentry,
2752 struct ext4_filename *fname)
2753{
2754 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2755}
2756
2757static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2758{
2759#ifdef CONFIG_UNICODE
2760 kfree(fname->cf_name.name);
2761 fname->cf_name.name = NULL;
2762#endif
2763}
2764#endif /* !CONFIG_FS_ENCRYPTION */
2765
2766/* dir.c */
2767extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2768 struct file *,
2769 struct ext4_dir_entry_2 *,
2770 struct buffer_head *, char *, int,
2771 unsigned int);
2772#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2773 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2774 (de), (bh), (buf), (size), (offset)))
2775extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2776 __u32 minor_hash,
2777 struct ext4_dir_entry_2 *dirent,
2778 struct fscrypt_str *ent_name);
2779extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2780extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2781 struct buffer_head *bh,
2782 void *buf, int buf_size,
2783 struct ext4_filename *fname,
2784 struct ext4_dir_entry_2 **dest_de);
2785void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2786 struct ext4_dir_entry_2 *de,
2787 int buf_size,
2788 struct ext4_filename *fname);
2789static inline void ext4_update_dx_flag(struct inode *inode)
2790{
2791 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2792 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2793 /* ext4_iget() should have caught this... */
2794 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2795 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2796 }
2797}
2798static const unsigned char ext4_filetype_table[] = {
2799 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2800};
2801
2802static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2803{
2804 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2805 return DT_UNKNOWN;
2806
2807 return ext4_filetype_table[filetype];
2808}
2809extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2810 void *buf, int buf_size);
2811
2812/* fsync.c */
2813extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2814
2815/* hash.c */
2816extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2817 struct dx_hash_info *hinfo);
2818
2819/* ialloc.c */
2820extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2821extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2822 struct inode *, umode_t,
2823 const struct qstr *qstr, __u32 goal,
2824 uid_t *owner, __u32 i_flags,
2825 int handle_type, unsigned int line_no,
2826 int nblocks);
2827
2828#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2829 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \
2830 (goal), (owner), i_flags, 0, 0, 0)
2831#define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2832 type, nblocks) \
2833 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2834 0, (type), __LINE__, (nblocks))
2835
2836
2837extern void ext4_free_inode(handle_t *, struct inode *);
2838extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2839extern unsigned long ext4_count_free_inodes(struct super_block *);
2840extern unsigned long ext4_count_dirs(struct super_block *);
2841extern void ext4_check_inodes_bitmap(struct super_block *);
2842extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2843extern int ext4_init_inode_table(struct super_block *sb,
2844 ext4_group_t group, int barrier);
2845extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2846
2847/* fast_commit.c */
2848int ext4_fc_info_show(struct seq_file *seq, void *v);
2849void ext4_fc_init(struct super_block *sb, journal_t *journal);
2850void ext4_fc_init_inode(struct inode *inode);
2851void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2852 ext4_lblk_t end);
2853void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2854 struct dentry *dentry);
2855void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2856 struct dentry *dentry);
2857void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2858void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2859void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2860 struct dentry *dentry);
2861void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2862void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2863void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2864void ext4_fc_start_ineligible(struct super_block *sb, int reason);
2865void ext4_fc_stop_ineligible(struct super_block *sb);
2866void ext4_fc_start_update(struct inode *inode);
2867void ext4_fc_stop_update(struct inode *inode);
2868void ext4_fc_del(struct inode *inode);
2869bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2870void ext4_fc_replay_cleanup(struct super_block *sb);
2871int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2872int __init ext4_fc_init_dentry_cache(void);
2873
2874/* mballoc.c */
2875extern const struct seq_operations ext4_mb_seq_groups_ops;
2876extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2877extern long ext4_mb_stats;
2878extern long ext4_mb_max_to_scan;
2879extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2880extern int ext4_mb_init(struct super_block *);
2881extern int ext4_mb_release(struct super_block *);
2882extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2883 struct ext4_allocation_request *, int *);
2884extern int ext4_mb_reserve_blocks(struct super_block *, int);
2885extern void ext4_discard_preallocations(struct inode *, unsigned int);
2886extern int __init ext4_init_mballoc(void);
2887extern void ext4_exit_mballoc(void);
2888extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2889 ext4_group_t group,
2890 unsigned int nr, int *cnt);
2891extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2892 unsigned int nr);
2893
2894extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2895 struct buffer_head *bh, ext4_fsblk_t block,
2896 unsigned long count, int flags);
2897extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2898 ext4_group_t ngroups);
2899extern int ext4_mb_add_groupinfo(struct super_block *sb,
2900 ext4_group_t i, struct ext4_group_desc *desc);
2901extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2902 ext4_fsblk_t block, unsigned long count);
2903extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2904extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2905extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2906 int len, int state);
2907
2908/* inode.c */
2909void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2910 struct ext4_inode_info *ei);
2911int ext4_inode_is_fast_symlink(struct inode *inode);
2912struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2913struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2914int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2915 bool wait, struct buffer_head **bhs);
2916int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2917 struct buffer_head *bh_result, int create);
2918int ext4_get_block(struct inode *inode, sector_t iblock,
2919 struct buffer_head *bh_result, int create);
2920int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2921 struct buffer_head *bh, int create);
2922int ext4_walk_page_buffers(handle_t *handle,
2923 struct buffer_head *head,
2924 unsigned from,
2925 unsigned to,
2926 int *partial,
2927 int (*fn)(handle_t *handle,
2928 struct buffer_head *bh));
2929int do_journal_get_write_access(handle_t *handle,
2930 struct buffer_head *bh);
2931#define FALL_BACK_TO_NONDELALLOC 1
2932#define CONVERT_INLINE_DATA 2
2933
2934typedef enum {
2935 EXT4_IGET_NORMAL = 0,
2936 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2937 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2938} ext4_iget_flags;
2939
2940extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2941 ext4_iget_flags flags, const char *function,
2942 unsigned int line);
2943
2944#define ext4_iget(sb, ino, flags) \
2945 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2946
2947extern int ext4_write_inode(struct inode *, struct writeback_control *);
2948extern int ext4_setattr(struct user_namespace *, struct dentry *,
2949 struct iattr *);
2950extern int ext4_getattr(struct user_namespace *, const struct path *,
2951 struct kstat *, u32, unsigned int);
2952extern void ext4_evict_inode(struct inode *);
2953extern void ext4_clear_inode(struct inode *);
2954extern int ext4_file_getattr(struct user_namespace *, const struct path *,
2955 struct kstat *, u32, unsigned int);
2956extern int ext4_sync_inode(handle_t *, struct inode *);
2957extern void ext4_dirty_inode(struct inode *, int);
2958extern int ext4_change_inode_journal_flag(struct inode *, int);
2959extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2960extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2961 struct ext4_iloc *iloc);
2962extern int ext4_inode_attach_jinode(struct inode *inode);
2963extern int ext4_can_truncate(struct inode *inode);
2964extern int ext4_truncate(struct inode *);
2965extern int ext4_break_layouts(struct inode *);
2966extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2967extern void ext4_set_inode_flags(struct inode *, bool init);
2968extern int ext4_alloc_da_blocks(struct inode *inode);
2969extern void ext4_set_aops(struct inode *inode);
2970extern int ext4_writepage_trans_blocks(struct inode *);
2971extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2972extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2973 loff_t lstart, loff_t lend);
2974extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2975extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2976extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2977extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2978extern void ext4_da_release_space(struct inode *inode, int to_free);
2979extern void ext4_da_update_reserve_space(struct inode *inode,
2980 int used, int quota_claim);
2981extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2982 ext4_fsblk_t pblk, ext4_lblk_t len);
2983
2984/* indirect.c */
2985extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2986 struct ext4_map_blocks *map, int flags);
2987extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2988extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2989extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2990 ext4_lblk_t start, ext4_lblk_t end);
2991
2992/* ioctl.c */
2993extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2994extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2995int ext4_fileattr_set(struct user_namespace *mnt_userns,
2996 struct dentry *dentry, struct fileattr *fa);
2997int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
2998extern void ext4_reset_inode_seed(struct inode *inode);
2999
3000/* migrate.c */
3001extern int ext4_ext_migrate(struct inode *);
3002extern int ext4_ind_migrate(struct inode *inode);
3003
3004/* namei.c */
3005extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3006 struct inode *inode);
3007extern int ext4_dirblock_csum_verify(struct inode *inode,
3008 struct buffer_head *bh);
3009extern int ext4_orphan_add(handle_t *, struct inode *);
3010extern int ext4_orphan_del(handle_t *, struct inode *);
3011extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3012 __u32 start_minor_hash, __u32 *next_hash);
3013extern int ext4_search_dir(struct buffer_head *bh,
3014 char *search_buf,
3015 int buf_size,
3016 struct inode *dir,
3017 struct ext4_filename *fname,
3018 unsigned int offset,
3019 struct ext4_dir_entry_2 **res_dir);
3020extern int ext4_generic_delete_entry(struct inode *dir,
3021 struct ext4_dir_entry_2 *de_del,
3022 struct buffer_head *bh,
3023 void *entry_buf,
3024 int buf_size,
3025 int csum_size);
3026extern bool ext4_empty_dir(struct inode *inode);
3027
3028/* resize.c */
3029extern void ext4_kvfree_array_rcu(void *to_free);
3030extern int ext4_group_add(struct super_block *sb,
3031 struct ext4_new_group_data *input);
3032extern int ext4_group_extend(struct super_block *sb,
3033 struct ext4_super_block *es,
3034 ext4_fsblk_t n_blocks_count);
3035extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3036
3037/* super.c */
3038extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3039 sector_t block, int op_flags);
3040extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3041 sector_t block);
3042extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3043 bh_end_io_t *end_io);
3044extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3045 bh_end_io_t *end_io);
3046extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3047extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3048extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3049extern int ext4_calculate_overhead(struct super_block *sb);
3050extern void ext4_superblock_csum_set(struct super_block *sb);
3051extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3052 ext4_group_t ngroup);
3053extern const char *ext4_decode_error(struct super_block *sb, int errno,
3054 char nbuf[16]);
3055extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3056 ext4_group_t block_group,
3057 unsigned int flags);
3058
3059extern __printf(7, 8)
3060void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3061 int, __u64, const char *, ...);
3062extern __printf(6, 7)
3063void __ext4_error_inode(struct inode *, const char *, unsigned int,
3064 ext4_fsblk_t, int, const char *, ...);
3065extern __printf(5, 6)
3066void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3067 const char *, ...);
3068extern void __ext4_std_error(struct super_block *, const char *,
3069 unsigned int, int);
3070extern __printf(4, 5)
3071void __ext4_warning(struct super_block *, const char *, unsigned int,
3072 const char *, ...);
3073extern __printf(4, 5)
3074void __ext4_warning_inode(const struct inode *inode, const char *function,
3075 unsigned int line, const char *fmt, ...);
3076extern __printf(3, 4)
3077void __ext4_msg(struct super_block *, const char *, const char *, ...);
3078extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3079 const char *, unsigned int, const char *);
3080extern __printf(7, 8)
3081void __ext4_grp_locked_error(const char *, unsigned int,
3082 struct super_block *, ext4_group_t,
3083 unsigned long, ext4_fsblk_t,
3084 const char *, ...);
3085
3086#define EXT4_ERROR_INODE(inode, fmt, a...) \
3087 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3088
3089#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3090 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3091
3092#define ext4_error_inode_block(inode, block, err, fmt, a...) \
3093 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3094 (fmt), ## a)
3095
3096#define EXT4_ERROR_FILE(file, block, fmt, a...) \
3097 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3098
3099#define ext4_abort(sb, err, fmt, a...) \
3100 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3101
3102#ifdef CONFIG_PRINTK
3103
3104#define ext4_error_inode(inode, func, line, block, fmt, ...) \
3105 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3106#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3107 __ext4_error_inode((inode), (func), (line), (block), \
3108 (err), (fmt), ##__VA_ARGS__)
3109#define ext4_error_file(file, func, line, block, fmt, ...) \
3110 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3111#define ext4_error(sb, fmt, ...) \
3112 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3113 ##__VA_ARGS__)
3114#define ext4_error_err(sb, err, fmt, ...) \
3115 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3116 ##__VA_ARGS__)
3117#define ext4_warning(sb, fmt, ...) \
3118 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3119#define ext4_warning_inode(inode, fmt, ...) \
3120 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3121#define ext4_msg(sb, level, fmt, ...) \
3122 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3123#define dump_mmp_msg(sb, mmp, msg) \
3124 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3125#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3126 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3127 fmt, ##__VA_ARGS__)
3128
3129#else
3130
3131#define ext4_error_inode(inode, func, line, block, fmt, ...) \
3132do { \
3133 no_printk(fmt, ##__VA_ARGS__); \
3134 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3135} while (0)
3136#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3137do { \
3138 no_printk(fmt, ##__VA_ARGS__); \
3139 __ext4_error_inode(inode, "", 0, block, err, " "); \
3140} while (0)
3141#define ext4_error_file(file, func, line, block, fmt, ...) \
3142do { \
3143 no_printk(fmt, ##__VA_ARGS__); \
3144 __ext4_error_file(file, "", 0, block, " "); \
3145} while (0)
3146#define ext4_error(sb, fmt, ...) \
3147do { \
3148 no_printk(fmt, ##__VA_ARGS__); \
3149 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3150} while (0)
3151#define ext4_error_err(sb, err, fmt, ...) \
3152do { \
3153 no_printk(fmt, ##__VA_ARGS__); \
3154 __ext4_error(sb, "", 0, false, err, 0, " "); \
3155} while (0)
3156#define ext4_warning(sb, fmt, ...) \
3157do { \
3158 no_printk(fmt, ##__VA_ARGS__); \
3159 __ext4_warning(sb, "", 0, " "); \
3160} while (0)
3161#define ext4_warning_inode(inode, fmt, ...) \
3162do { \
3163 no_printk(fmt, ##__VA_ARGS__); \
3164 __ext4_warning_inode(inode, "", 0, " "); \
3165} while (0)
3166#define ext4_msg(sb, level, fmt, ...) \
3167do { \
3168 no_printk(fmt, ##__VA_ARGS__); \
3169 __ext4_msg(sb, "", " "); \
3170} while (0)
3171#define dump_mmp_msg(sb, mmp, msg) \
3172 __dump_mmp_msg(sb, mmp, "", 0, "")
3173#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3174do { \
3175 no_printk(fmt, ##__VA_ARGS__); \
3176 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3177} while (0)
3178
3179#endif
3180
3181extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3182 struct ext4_group_desc *bg);
3183extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3184 struct ext4_group_desc *bg);
3185extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3186 struct ext4_group_desc *bg);
3187extern __u32 ext4_free_group_clusters(struct super_block *sb,
3188 struct ext4_group_desc *bg);
3189extern __u32 ext4_free_inodes_count(struct super_block *sb,
3190 struct ext4_group_desc *bg);
3191extern __u32 ext4_used_dirs_count(struct super_block *sb,
3192 struct ext4_group_desc *bg);
3193extern __u32 ext4_itable_unused_count(struct super_block *sb,
3194 struct ext4_group_desc *bg);
3195extern void ext4_block_bitmap_set(struct super_block *sb,
3196 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3197extern void ext4_inode_bitmap_set(struct super_block *sb,
3198 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3199extern void ext4_inode_table_set(struct super_block *sb,
3200 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3201extern void ext4_free_group_clusters_set(struct super_block *sb,
3202 struct ext4_group_desc *bg,
3203 __u32 count);
3204extern void ext4_free_inodes_set(struct super_block *sb,
3205 struct ext4_group_desc *bg, __u32 count);
3206extern void ext4_used_dirs_set(struct super_block *sb,
3207 struct ext4_group_desc *bg, __u32 count);
3208extern void ext4_itable_unused_set(struct super_block *sb,
3209 struct ext4_group_desc *bg, __u32 count);
3210extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3211 struct ext4_group_desc *gdp);
3212extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3213 struct ext4_group_desc *gdp);
3214extern int ext4_register_li_request(struct super_block *sb,
3215 ext4_group_t first_not_zeroed);
3216
3217static inline int ext4_has_metadata_csum(struct super_block *sb)
3218{
3219 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3220 !EXT4_SB(sb)->s_chksum_driver);
3221
3222 return ext4_has_feature_metadata_csum(sb) &&
3223 (EXT4_SB(sb)->s_chksum_driver != NULL);
3224}
3225
3226static inline int ext4_has_group_desc_csum(struct super_block *sb)
3227{
3228 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3229}
3230
3231#define ext4_read_incompat_64bit_val(es, name) \
3232 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3233 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3234 le32_to_cpu(es->name##_lo))
3235
3236static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3237{
3238 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3239}
3240
3241static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3242{
3243 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3244}
3245
3246static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3247{
3248 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3249}
3250
3251static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3252 ext4_fsblk_t blk)
3253{
3254 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3255 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3256}
3257
3258static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3259 ext4_fsblk_t blk)
3260{
3261 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3262 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3263}
3264
3265static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3266 ext4_fsblk_t blk)
3267{
3268 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3269 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3270}
3271
3272static inline loff_t ext4_isize(struct super_block *sb,
3273 struct ext4_inode *raw_inode)
3274{
3275 if (ext4_has_feature_largedir(sb) ||
3276 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3277 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3278 le32_to_cpu(raw_inode->i_size_lo);
3279
3280 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3281}
3282
3283static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3284{
3285 raw_inode->i_size_lo = cpu_to_le32(i_size);
3286 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3287}
3288
3289static inline
3290struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3291 ext4_group_t group)
3292{
3293 struct ext4_group_info **grp_info;
3294 long indexv, indexh;
3295 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3296 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3297 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3298 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3299 return grp_info[indexh];
3300}
3301
3302/*
3303 * Reading s_groups_count requires using smp_rmb() afterwards. See
3304 * the locking protocol documented in the comments of ext4_group_add()
3305 * in resize.c
3306 */
3307static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3308{
3309 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3310
3311 smp_rmb();
3312 return ngroups;
3313}
3314
3315static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3316 ext4_group_t block_group)
3317{
3318 return block_group >> sbi->s_log_groups_per_flex;
3319}
3320
3321static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3322{
3323 return 1 << sbi->s_log_groups_per_flex;
3324}
3325
3326#define ext4_std_error(sb, errno) \
3327do { \
3328 if ((errno)) \
3329 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3330} while (0)
3331
3332#ifdef CONFIG_SMP
3333/* Each CPU can accumulate percpu_counter_batch clusters in their local
3334 * counters. So we need to make sure we have free clusters more
3335 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3336 */
3337#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3338#else
3339#define EXT4_FREECLUSTERS_WATERMARK 0
3340#endif
3341
3342/* Update i_disksize. Requires i_mutex to avoid races with truncate */
3343static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3344{
3345 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3346 !inode_is_locked(inode));
3347 down_write(&EXT4_I(inode)->i_data_sem);
3348 if (newsize > EXT4_I(inode)->i_disksize)
3349 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3350 up_write(&EXT4_I(inode)->i_data_sem);
3351}
3352
3353/* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3354static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3355{
3356 int changed = 0;
3357
3358 if (newsize > inode->i_size) {
3359 i_size_write(inode, newsize);
3360 changed = 1;
3361 }
3362 if (newsize > EXT4_I(inode)->i_disksize) {
3363 ext4_update_i_disksize(inode, newsize);
3364 changed |= 2;
3365 }
3366 return changed;
3367}
3368
3369int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3370 loff_t len);
3371
3372struct ext4_group_info {
3373 unsigned long bb_state;
3374#ifdef AGGRESSIVE_CHECK
3375 unsigned long bb_check_counter;
3376#endif
3377 struct rb_root bb_free_root;
3378 ext4_grpblk_t bb_first_free; /* first free block */
3379 ext4_grpblk_t bb_free; /* total free blocks */
3380 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3381 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3382 ext4_group_t bb_group; /* Group number */
3383 struct list_head bb_prealloc_list;
3384#ifdef DOUBLE_CHECK
3385 void *bb_bitmap;
3386#endif
3387 struct rw_semaphore alloc_sem;
3388 struct rb_node bb_avg_fragment_size_rb;
3389 struct list_head bb_largest_free_order_node;
3390 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3391 * regions, index is order.
3392 * bb_counters[3] = 5 means
3393 * 5 free 8-block regions. */
3394};
3395
3396#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3397#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3398#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3399#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3400#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3401 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3402#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3403 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3404#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3405
3406#define EXT4_MB_GRP_NEED_INIT(grp) \
3407 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3408#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3409 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3410#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3411 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3412
3413#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3414 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3415#define EXT4_MB_GRP_SET_TRIMMED(grp) \
3416 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3417#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3418 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3419#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3420 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3421
3422#define EXT4_MAX_CONTENTION 8
3423#define EXT4_CONTENTION_THRESHOLD 2
3424
3425static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3426 ext4_group_t group)
3427{
3428 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3429}
3430
3431/*
3432 * Returns true if the filesystem is busy enough that attempts to
3433 * access the block group locks has run into contention.
3434 */
3435static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3436{
3437 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3438}
3439
3440static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3441{
3442 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3443 if (spin_trylock(lock))
3444 /*
3445 * We're able to grab the lock right away, so drop the
3446 * lock contention counter.
3447 */
3448 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3449 else {
3450 /*
3451 * The lock is busy, so bump the contention counter,
3452 * and then wait on the spin lock.
3453 */
3454 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3455 EXT4_MAX_CONTENTION);
3456 spin_lock(lock);
3457 }
3458}
3459
3460static inline void ext4_unlock_group(struct super_block *sb,
3461 ext4_group_t group)
3462{
3463 spin_unlock(ext4_group_lock_ptr(sb, group));
3464}
3465
3466#ifdef CONFIG_QUOTA
3467static inline bool ext4_quota_capable(struct super_block *sb)
3468{
3469 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3470}
3471
3472static inline bool ext4_is_quota_journalled(struct super_block *sb)
3473{
3474 struct ext4_sb_info *sbi = EXT4_SB(sb);
3475
3476 return (ext4_has_feature_quota(sb) ||
3477 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3478}
3479#endif
3480
3481/*
3482 * Block validity checking
3483 */
3484#define ext4_check_indirect_blockref(inode, bh) \
3485 ext4_check_blockref(__func__, __LINE__, inode, \
3486 (__le32 *)(bh)->b_data, \
3487 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3488
3489#define ext4_ind_check_inode(inode) \
3490 ext4_check_blockref(__func__, __LINE__, inode, \
3491 EXT4_I(inode)->i_data, \
3492 EXT4_NDIR_BLOCKS)
3493
3494/*
3495 * Inodes and files operations
3496 */
3497
3498/* dir.c */
3499extern const struct file_operations ext4_dir_operations;
3500
3501/* file.c */
3502extern const struct inode_operations ext4_file_inode_operations;
3503extern const struct file_operations ext4_file_operations;
3504extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3505
3506/* inline.c */
3507extern int ext4_get_max_inline_size(struct inode *inode);
3508extern int ext4_find_inline_data_nolock(struct inode *inode);
3509extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3510 unsigned int len);
3511extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3512
3513extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3514extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3515 struct inode *inode,
3516 loff_t pos, unsigned len,
3517 unsigned flags,
3518 struct page **pagep);
3519extern int ext4_write_inline_data_end(struct inode *inode,
3520 loff_t pos, unsigned len,
3521 unsigned copied,
3522 struct page *page);
3523extern struct buffer_head *
3524ext4_journalled_write_inline_data(struct inode *inode,
3525 unsigned len,
3526 struct page *page);
3527extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3528 struct inode *inode,
3529 loff_t pos, unsigned len,
3530 unsigned flags,
3531 struct page **pagep,
3532 void **fsdata);
3533extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3534 unsigned len, unsigned copied,
3535 struct page *page);
3536extern int ext4_try_add_inline_entry(handle_t *handle,
3537 struct ext4_filename *fname,
3538 struct inode *dir, struct inode *inode);
3539extern int ext4_try_create_inline_dir(handle_t *handle,
3540 struct inode *parent,
3541 struct inode *inode);
3542extern int ext4_read_inline_dir(struct file *filp,
3543 struct dir_context *ctx,
3544 int *has_inline_data);
3545extern int ext4_inlinedir_to_tree(struct file *dir_file,
3546 struct inode *dir, ext4_lblk_t block,
3547 struct dx_hash_info *hinfo,
3548 __u32 start_hash, __u32 start_minor_hash,
3549 int *has_inline_data);
3550extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3551 struct ext4_filename *fname,
3552 struct ext4_dir_entry_2 **res_dir,
3553 int *has_inline_data);
3554extern int ext4_delete_inline_entry(handle_t *handle,
3555 struct inode *dir,
3556 struct ext4_dir_entry_2 *de_del,
3557 struct buffer_head *bh,
3558 int *has_inline_data);
3559extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3560extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3561 struct ext4_dir_entry_2 **parent_de,
3562 int *retval);
3563extern int ext4_inline_data_fiemap(struct inode *inode,
3564 struct fiemap_extent_info *fieinfo,
3565 int *has_inline, __u64 start, __u64 len);
3566
3567struct iomap;
3568extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3569
3570extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3571
3572extern int ext4_convert_inline_data(struct inode *inode);
3573
3574static inline int ext4_has_inline_data(struct inode *inode)
3575{
3576 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3577 EXT4_I(inode)->i_inline_off;
3578}
3579
3580/* namei.c */
3581extern const struct inode_operations ext4_dir_inode_operations;
3582extern const struct inode_operations ext4_special_inode_operations;
3583extern struct dentry *ext4_get_parent(struct dentry *child);
3584extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3585 struct ext4_dir_entry_2 *de,
3586 int blocksize, int csum_size,
3587 unsigned int parent_ino, int dotdot_real_len);
3588extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3589 unsigned int blocksize);
3590extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3591 struct buffer_head *bh);
3592extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3593 struct inode *inode);
3594extern int __ext4_link(struct inode *dir, struct inode *inode,
3595 struct dentry *dentry);
3596
3597#define S_SHIFT 12
3598static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3599 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3600 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3601 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3602 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3603 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3604 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3605 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3606};
3607
3608static inline void ext4_set_de_type(struct super_block *sb,
3609 struct ext4_dir_entry_2 *de,
3610 umode_t mode) {
3611 if (ext4_has_feature_filetype(sb))
3612 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3613}
3614
3615/* readpages.c */
3616extern int ext4_mpage_readpages(struct inode *inode,
3617 struct readahead_control *rac, struct page *page);
3618extern int __init ext4_init_post_read_processing(void);
3619extern void ext4_exit_post_read_processing(void);
3620
3621/* symlink.c */
3622extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3623extern const struct inode_operations ext4_symlink_inode_operations;
3624extern const struct inode_operations ext4_fast_symlink_inode_operations;
3625
3626/* sysfs.c */
3627extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3628extern int ext4_register_sysfs(struct super_block *sb);
3629extern void ext4_unregister_sysfs(struct super_block *sb);
3630extern int __init ext4_init_sysfs(void);
3631extern void ext4_exit_sysfs(void);
3632
3633/* block_validity */
3634extern void ext4_release_system_zone(struct super_block *sb);
3635extern int ext4_setup_system_zone(struct super_block *sb);
3636extern int __init ext4_init_system_zone(void);
3637extern void ext4_exit_system_zone(void);
3638extern int ext4_inode_block_valid(struct inode *inode,
3639 ext4_fsblk_t start_blk,
3640 unsigned int count);
3641extern int ext4_check_blockref(const char *, unsigned int,
3642 struct inode *, __le32 *, unsigned int);
3643
3644/* extents.c */
3645struct ext4_ext_path;
3646struct ext4_extent;
3647
3648/*
3649 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3650 * __le32.
3651 */
3652#define EXT_MAX_BLOCKS 0xffffffff
3653
3654extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3655extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3656extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3657 struct ext4_map_blocks *map, int flags);
3658extern int ext4_ext_truncate(handle_t *, struct inode *);
3659extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3660 ext4_lblk_t end);
3661extern void ext4_ext_init(struct super_block *);
3662extern void ext4_ext_release(struct super_block *);
3663extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3664 loff_t len);
3665extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3666 loff_t offset, ssize_t len);
3667extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3668 ext4_io_end_t *io_end);
3669extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3670 struct ext4_map_blocks *map, int flags);
3671extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3672 int num,
3673 struct ext4_ext_path *path);
3674extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3675 struct ext4_ext_path **,
3676 struct ext4_extent *, int);
3677extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3678 struct ext4_ext_path **,
3679 int flags);
3680extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3681extern int ext4_ext_check_inode(struct inode *inode);
3682extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3683extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3684 __u64 start, __u64 len);
3685extern int ext4_get_es_cache(struct inode *inode,
3686 struct fiemap_extent_info *fieinfo,
3687 __u64 start, __u64 len);
3688extern int ext4_ext_precache(struct inode *inode);
3689extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3690 struct inode *inode2, ext4_lblk_t lblk1,
3691 ext4_lblk_t lblk2, ext4_lblk_t count,
3692 int mark_unwritten,int *err);
3693extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3694extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3695 int check_cred, int restart_cred,
3696 int revoke_cred);
3697extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3698extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3699extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3700 int len, int unwritten, ext4_fsblk_t pblk);
3701extern int ext4_ext_clear_bb(struct inode *inode);
3702
3703
3704/* move_extent.c */
3705extern void ext4_double_down_write_data_sem(struct inode *first,
3706 struct inode *second);
3707extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3708 struct inode *donor_inode);
3709extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3710 __u64 start_orig, __u64 start_donor,
3711 __u64 len, __u64 *moved_len);
3712
3713/* page-io.c */
3714extern int __init ext4_init_pageio(void);
3715extern void ext4_exit_pageio(void);
3716extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3717extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3718extern int ext4_put_io_end(ext4_io_end_t *io_end);
3719extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3720extern void ext4_io_submit_init(struct ext4_io_submit *io,
3721 struct writeback_control *wbc);
3722extern void ext4_end_io_rsv_work(struct work_struct *work);
3723extern void ext4_io_submit(struct ext4_io_submit *io);
3724extern int ext4_bio_write_page(struct ext4_io_submit *io,
3725 struct page *page,
3726 int len,
3727 bool keep_towrite);
3728extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3729extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3730
3731/* mmp.c */
3732extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3733
3734/* mmp.c */
3735extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3736
3737/* verity.c */
3738extern const struct fsverity_operations ext4_verityops;
3739
3740/*
3741 * Add new method to test whether block and inode bitmaps are properly
3742 * initialized. With uninit_bg reading the block from disk is not enough
3743 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3744 */
3745#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3746
3747static inline int bitmap_uptodate(struct buffer_head *bh)
3748{
3749 return (buffer_uptodate(bh) &&
3750 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3751}
3752static inline void set_bitmap_uptodate(struct buffer_head *bh)
3753{
3754 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3755}
3756
3757#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3758
3759/* For ioend & aio unwritten conversion wait queues */
3760#define EXT4_WQ_HASH_SZ 37
3761#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3762 EXT4_WQ_HASH_SZ])
3763extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3764
3765extern int ext4_resize_begin(struct super_block *sb);
3766extern void ext4_resize_end(struct super_block *sb);
3767
3768static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3769 struct ext4_io_end *io_end)
3770{
3771 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3772 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3773 atomic_inc(&EXT4_I(inode)->i_unwritten);
3774 }
3775}
3776
3777static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3778{
3779 struct inode *inode = io_end->inode;
3780
3781 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3782 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3783 /* Wake up anyone waiting on unwritten extent conversion */
3784 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3785 wake_up_all(ext4_ioend_wq(inode));
3786 }
3787}
3788
3789extern const struct iomap_ops ext4_iomap_ops;
3790extern const struct iomap_ops ext4_iomap_overwrite_ops;
3791extern const struct iomap_ops ext4_iomap_report_ops;
3792
3793static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3794{
3795 /*
3796 * If the buffer has the write error flag, we have failed
3797 * to write out data in the block. In this case, we don't
3798 * have to read the block because we may read the old data
3799 * successfully.
3800 */
3801 if (buffer_write_io_error(bh))
3802 set_buffer_uptodate(bh);
3803 return buffer_uptodate(bh);
3804}
3805
3806#endif /* __KERNEL__ */
3807
3808#define EFSBADCRC EBADMSG /* Bad CRC detected */
3809#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3810
3811#endif /* _EXT4_H */