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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/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
32#include <crypto/hash.h>
33#ifdef __KERNEL__
34#include <linux/compat.h>
35#endif
36
37/*
38 * The fourth extended filesystem constants/structures
39 */
40
41/*
42 * Define EXT4FS_DEBUG to produce debug messages
43 */
44#undef EXT4FS_DEBUG
45
46/*
47 * Debug code
48 */
49#ifdef EXT4FS_DEBUG
50#define ext4_debug(f, a...) \
51 do { \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
55 } while (0)
56#else
57#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
58#endif
59
60#define EXT4_ERROR_INODE(inode, fmt, a...) \
61 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
62
63#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
64 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
65
66#define EXT4_ERROR_FILE(file, block, fmt, a...) \
67 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
68
69/* data type for block offset of block group */
70typedef int ext4_grpblk_t;
71
72/* data type for filesystem-wide blocks number */
73typedef unsigned long long ext4_fsblk_t;
74
75/* data type for file logical block number */
76typedef __u32 ext4_lblk_t;
77
78/* data type for block group number */
79typedef unsigned int ext4_group_t;
80
81/*
82 * Flags used in mballoc's allocation_context flags field.
83 *
84 * Also used to show what's going on for debugging purposes when the
85 * flag field is exported via the traceport interface
86 */
87
88/* prefer goal again. length */
89#define EXT4_MB_HINT_MERGE 0x0001
90/* blocks already reserved */
91#define EXT4_MB_HINT_RESERVED 0x0002
92/* metadata is being allocated */
93#define EXT4_MB_HINT_METADATA 0x0004
94/* first blocks in the file */
95#define EXT4_MB_HINT_FIRST 0x0008
96/* search for the best chunk */
97#define EXT4_MB_HINT_BEST 0x0010
98/* data is being allocated */
99#define EXT4_MB_HINT_DATA 0x0020
100/* don't preallocate (for tails) */
101#define EXT4_MB_HINT_NOPREALLOC 0x0040
102/* allocate for locality group */
103#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
104/* allocate goal blocks or none */
105#define EXT4_MB_HINT_GOAL_ONLY 0x0100
106/* goal is meaningful */
107#define EXT4_MB_HINT_TRY_GOAL 0x0200
108/* blocks already pre-reserved by delayed allocation */
109#define EXT4_MB_DELALLOC_RESERVED 0x0400
110/* We are doing stream allocation */
111#define EXT4_MB_STREAM_ALLOC 0x0800
112/* Use reserved root blocks if needed */
113#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
114
115struct ext4_allocation_request {
116 /* target inode for block we're allocating */
117 struct inode *inode;
118 /* how many blocks we want to allocate */
119 unsigned int len;
120 /* logical block in target inode */
121 ext4_lblk_t logical;
122 /* the closest logical allocated block to the left */
123 ext4_lblk_t lleft;
124 /* the closest logical allocated block to the right */
125 ext4_lblk_t lright;
126 /* phys. target (a hint) */
127 ext4_fsblk_t goal;
128 /* phys. block for the closest logical allocated block to the left */
129 ext4_fsblk_t pleft;
130 /* phys. block for the closest logical allocated block to the right */
131 ext4_fsblk_t pright;
132 /* flags. see above EXT4_MB_HINT_* */
133 unsigned int flags;
134};
135
136/*
137 * Logical to physical block mapping, used by ext4_map_blocks()
138 *
139 * This structure is used to pass requests into ext4_map_blocks() as
140 * well as to store the information returned by ext4_map_blocks(). It
141 * takes less room on the stack than a struct buffer_head.
142 */
143#define EXT4_MAP_NEW (1 << BH_New)
144#define EXT4_MAP_MAPPED (1 << BH_Mapped)
145#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
146#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
147#define EXT4_MAP_UNINIT (1 << BH_Uninit)
148/* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
149 * ext4_map_blocks wants to know whether or not the underlying cluster has
150 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
151 * the requested mapping was from previously mapped (or delayed allocated)
152 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
153 * should never appear on buffer_head's state flags.
154 */
155#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
156#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
157 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
158 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
159
160struct ext4_map_blocks {
161 ext4_fsblk_t m_pblk;
162 ext4_lblk_t m_lblk;
163 unsigned int m_len;
164 unsigned int m_flags;
165};
166
167/*
168 * For delayed allocation tracking
169 */
170struct mpage_da_data {
171 struct inode *inode;
172 sector_t b_blocknr; /* start block number of extent */
173 size_t b_size; /* size of extent */
174 unsigned long b_state; /* state of the extent */
175 unsigned long first_page, next_page; /* extent of pages */
176 struct writeback_control *wbc;
177 int io_done;
178 int pages_written;
179 int retval;
180};
181
182/*
183 * Flags for ext4_io_end->flags
184 */
185#define EXT4_IO_END_UNWRITTEN 0x0001
186#define EXT4_IO_END_ERROR 0x0002
187#define EXT4_IO_END_QUEUED 0x0004
188#define EXT4_IO_END_DIRECT 0x0008
189#define EXT4_IO_END_IN_FSYNC 0x0010
190
191struct ext4_io_page {
192 struct page *p_page;
193 atomic_t p_count;
194};
195
196#define MAX_IO_PAGES 128
197
198/*
199 * For converting uninitialized extents on a work queue.
200 *
201 * 'page' is only used from the writepage() path; 'pages' is only used for
202 * buffered writes; they are used to keep page references until conversion
203 * takes place. For AIO/DIO, neither field is filled in.
204 */
205typedef struct ext4_io_end {
206 struct list_head list; /* per-file finished IO list */
207 struct inode *inode; /* file being written to */
208 unsigned int flag; /* unwritten or not */
209 struct page *page; /* for writepage() path */
210 loff_t offset; /* offset in the file */
211 ssize_t size; /* size of the extent */
212 struct work_struct work; /* data work queue */
213 struct kiocb *iocb; /* iocb struct for AIO */
214 int result; /* error value for AIO */
215 int num_io_pages; /* for writepages() */
216 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */
217} ext4_io_end_t;
218
219struct ext4_io_submit {
220 int io_op;
221 struct bio *io_bio;
222 ext4_io_end_t *io_end;
223 struct ext4_io_page *io_page;
224 sector_t io_next_block;
225};
226
227/*
228 * Special inodes numbers
229 */
230#define EXT4_BAD_INO 1 /* Bad blocks inode */
231#define EXT4_ROOT_INO 2 /* Root inode */
232#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
233#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
234#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
235#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
236#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
237#define EXT4_JOURNAL_INO 8 /* Journal inode */
238
239/* First non-reserved inode for old ext4 filesystems */
240#define EXT4_GOOD_OLD_FIRST_INO 11
241
242/*
243 * Maximal count of links to a file
244 */
245#define EXT4_LINK_MAX 65000
246
247/*
248 * Macro-instructions used to manage several block sizes
249 */
250#define EXT4_MIN_BLOCK_SIZE 1024
251#define EXT4_MAX_BLOCK_SIZE 65536
252#define EXT4_MIN_BLOCK_LOG_SIZE 10
253#define EXT4_MAX_BLOCK_LOG_SIZE 16
254#ifdef __KERNEL__
255# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
256#else
257# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
258#endif
259#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
260#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
261 EXT4_SB(s)->s_cluster_bits)
262#ifdef __KERNEL__
263# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
264# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
265#else
266# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
267#endif
268#ifdef __KERNEL__
269#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
270#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
271#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
272#else
273#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
274 EXT4_GOOD_OLD_INODE_SIZE : \
275 (s)->s_inode_size)
276#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
277 EXT4_GOOD_OLD_FIRST_INO : \
278 (s)->s_first_ino)
279#endif
280#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
281
282/* Translate a block number to a cluster number */
283#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
284/* Translate a cluster number to a block number */
285#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
286/* Translate # of blks to # of clusters */
287#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
288 (sbi)->s_cluster_bits)
289
290/*
291 * Structure of a blocks group descriptor
292 */
293struct ext4_group_desc
294{
295 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
296 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
297 __le32 bg_inode_table_lo; /* Inodes table block */
298 __le16 bg_free_blocks_count_lo;/* Free blocks count */
299 __le16 bg_free_inodes_count_lo;/* Free inodes count */
300 __le16 bg_used_dirs_count_lo; /* Directories count */
301 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
302 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
303 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
304 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
305 __le16 bg_itable_unused_lo; /* Unused inodes count */
306 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
307 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
308 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
309 __le32 bg_inode_table_hi; /* Inodes table block MSB */
310 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
311 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
312 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
313 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
314 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
315 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
316 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
317 __u32 bg_reserved;
318};
319
320#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
321 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
322 sizeof(__le16))
323#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
324 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
325 sizeof(__le16))
326
327/*
328 * Structure of a flex block group info
329 */
330
331struct flex_groups {
332 atomic_t free_inodes;
333 atomic_t free_clusters;
334 atomic_t used_dirs;
335};
336
337#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
338#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
339#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
340
341/*
342 * Macro-instructions used to manage group descriptors
343 */
344#define EXT4_MIN_DESC_SIZE 32
345#define EXT4_MIN_DESC_SIZE_64BIT 64
346#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
347#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
348#ifdef __KERNEL__
349# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
350# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
351# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
352# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
353# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
354#else
355# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
356# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
357# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
358#endif
359
360/*
361 * Constants relative to the data blocks
362 */
363#define EXT4_NDIR_BLOCKS 12
364#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
365#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
366#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
367#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
368
369/*
370 * Inode flags
371 */
372#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
373#define EXT4_UNRM_FL 0x00000002 /* Undelete */
374#define EXT4_COMPR_FL 0x00000004 /* Compress file */
375#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
376#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
377#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
378#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
379#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
380/* Reserved for compression usage... */
381#define EXT4_DIRTY_FL 0x00000100
382#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
383#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
384#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
385/* End compression flags --- maybe not all used */
386#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
387#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
388#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
389#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
390#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
391#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
392#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
393#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
394#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
395#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
396#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
397
398#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
399#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
400
401/* Flags that should be inherited by new inodes from their parent. */
402#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
403 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
404 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
405 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
406
407/* Flags that are appropriate for regular files (all but dir-specific ones). */
408#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
409
410/* Flags that are appropriate for non-directories/regular files. */
411#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
412
413/* Mask out flags that are inappropriate for the given type of inode. */
414static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
415{
416 if (S_ISDIR(mode))
417 return flags;
418 else if (S_ISREG(mode))
419 return flags & EXT4_REG_FLMASK;
420 else
421 return flags & EXT4_OTHER_FLMASK;
422}
423
424/*
425 * Inode flags used for atomic set/get
426 */
427enum {
428 EXT4_INODE_SECRM = 0, /* Secure deletion */
429 EXT4_INODE_UNRM = 1, /* Undelete */
430 EXT4_INODE_COMPR = 2, /* Compress file */
431 EXT4_INODE_SYNC = 3, /* Synchronous updates */
432 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
433 EXT4_INODE_APPEND = 5, /* writes to file may only append */
434 EXT4_INODE_NODUMP = 6, /* do not dump file */
435 EXT4_INODE_NOATIME = 7, /* do not update atime */
436/* Reserved for compression usage... */
437 EXT4_INODE_DIRTY = 8,
438 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
439 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
440 EXT4_INODE_ECOMPR = 11, /* Compression error */
441/* End compression flags --- maybe not all used */
442 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
443 EXT4_INODE_IMAGIC = 13, /* AFS directory */
444 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
445 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
446 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
447 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
448 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
449 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
450 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
451 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
452 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
453};
454
455#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
456#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
457 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
458 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
459
460/*
461 * Since it's pretty easy to mix up bit numbers and hex values, and we
462 * can't do a compile-time test for ENUM values, we use a run-time
463 * test to make sure that EXT4_XXX_FL is consistent with respect to
464 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
465 * out so it won't cost any extra space in the compiled kernel image.
466 * But it's important that these values are the same, since we are
467 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
468 * must be consistent with the values of FS_XXX_FL defined in
469 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
470 * ext4 filesystems, and of course the values defined in e2fsprogs.
471 *
472 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
473 */
474static inline void ext4_check_flag_values(void)
475{
476 CHECK_FLAG_VALUE(SECRM);
477 CHECK_FLAG_VALUE(UNRM);
478 CHECK_FLAG_VALUE(COMPR);
479 CHECK_FLAG_VALUE(SYNC);
480 CHECK_FLAG_VALUE(IMMUTABLE);
481 CHECK_FLAG_VALUE(APPEND);
482 CHECK_FLAG_VALUE(NODUMP);
483 CHECK_FLAG_VALUE(NOATIME);
484 CHECK_FLAG_VALUE(DIRTY);
485 CHECK_FLAG_VALUE(COMPRBLK);
486 CHECK_FLAG_VALUE(NOCOMPR);
487 CHECK_FLAG_VALUE(ECOMPR);
488 CHECK_FLAG_VALUE(INDEX);
489 CHECK_FLAG_VALUE(IMAGIC);
490 CHECK_FLAG_VALUE(JOURNAL_DATA);
491 CHECK_FLAG_VALUE(NOTAIL);
492 CHECK_FLAG_VALUE(DIRSYNC);
493 CHECK_FLAG_VALUE(TOPDIR);
494 CHECK_FLAG_VALUE(HUGE_FILE);
495 CHECK_FLAG_VALUE(EXTENTS);
496 CHECK_FLAG_VALUE(EA_INODE);
497 CHECK_FLAG_VALUE(EOFBLOCKS);
498 CHECK_FLAG_VALUE(RESERVED);
499}
500
501/* Used to pass group descriptor data when online resize is done */
502struct ext4_new_group_input {
503 __u32 group; /* Group number for this data */
504 __u64 block_bitmap; /* Absolute block number of block bitmap */
505 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
506 __u64 inode_table; /* Absolute block number of inode table start */
507 __u32 blocks_count; /* Total number of blocks in this group */
508 __u16 reserved_blocks; /* Number of reserved blocks in this group */
509 __u16 unused;
510};
511
512#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
513struct compat_ext4_new_group_input {
514 u32 group;
515 compat_u64 block_bitmap;
516 compat_u64 inode_bitmap;
517 compat_u64 inode_table;
518 u32 blocks_count;
519 u16 reserved_blocks;
520 u16 unused;
521};
522#endif
523
524/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
525struct ext4_new_group_data {
526 __u32 group;
527 __u64 block_bitmap;
528 __u64 inode_bitmap;
529 __u64 inode_table;
530 __u32 blocks_count;
531 __u16 reserved_blocks;
532 __u16 unused;
533 __u32 free_blocks_count;
534};
535
536/* Indexes used to index group tables in ext4_new_group_data */
537enum {
538 BLOCK_BITMAP = 0, /* block bitmap */
539 INODE_BITMAP, /* inode bitmap */
540 INODE_TABLE, /* inode tables */
541 GROUP_TABLE_COUNT,
542};
543
544/*
545 * Flags used by ext4_map_blocks()
546 */
547 /* Allocate any needed blocks and/or convert an unitialized
548 extent to be an initialized ext4 */
549#define EXT4_GET_BLOCKS_CREATE 0x0001
550 /* Request the creation of an unitialized extent */
551#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
552#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
553 EXT4_GET_BLOCKS_CREATE)
554 /* Caller is from the delayed allocation writeout path,
555 so set the magic i_delalloc_reserve_flag after taking the
556 inode allocation semaphore for */
557#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
558 /* caller is from the direct IO path, request to creation of an
559 unitialized extents if not allocated, split the uninitialized
560 extent if blocks has been preallocated already*/
561#define EXT4_GET_BLOCKS_PRE_IO 0x0008
562#define EXT4_GET_BLOCKS_CONVERT 0x0010
563#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
564 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
565 /* Convert extent to initialized after IO complete */
566#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
567 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
568 /* Punch out blocks of an extent */
569#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
570 /* Don't normalize allocation size (used for fallocate) */
571#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
572 /* Request will not result in inode size update (user for fallocate) */
573#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
574
575/*
576 * Flags used by ext4_free_blocks
577 */
578#define EXT4_FREE_BLOCKS_METADATA 0x0001
579#define EXT4_FREE_BLOCKS_FORGET 0x0002
580#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
581#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
582#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
583#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
584
585/*
586 * Flags used by ext4_discard_partial_page_buffers
587 */
588#define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
589
590/*
591 * ioctl commands
592 */
593#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
594#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
595#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
596#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
597#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
598#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
599#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
600#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
601#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
602#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
603#define EXT4_IOC_MIGRATE _IO('f', 9)
604 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
605 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
606#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
607#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
608#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
609
610#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
611/*
612 * ioctl commands in 32 bit emulation
613 */
614#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
615#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
616#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
617#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
618#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
619#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
620#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
621#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
622#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
623#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
624#endif
625
626/* Max physical block we can address w/o extents */
627#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
628
629/*
630 * Structure of an inode on the disk
631 */
632struct ext4_inode {
633 __le16 i_mode; /* File mode */
634 __le16 i_uid; /* Low 16 bits of Owner Uid */
635 __le32 i_size_lo; /* Size in bytes */
636 __le32 i_atime; /* Access time */
637 __le32 i_ctime; /* Inode Change time */
638 __le32 i_mtime; /* Modification time */
639 __le32 i_dtime; /* Deletion Time */
640 __le16 i_gid; /* Low 16 bits of Group Id */
641 __le16 i_links_count; /* Links count */
642 __le32 i_blocks_lo; /* Blocks count */
643 __le32 i_flags; /* File flags */
644 union {
645 struct {
646 __le32 l_i_version;
647 } linux1;
648 struct {
649 __u32 h_i_translator;
650 } hurd1;
651 struct {
652 __u32 m_i_reserved1;
653 } masix1;
654 } osd1; /* OS dependent 1 */
655 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
656 __le32 i_generation; /* File version (for NFS) */
657 __le32 i_file_acl_lo; /* File ACL */
658 __le32 i_size_high;
659 __le32 i_obso_faddr; /* Obsoleted fragment address */
660 union {
661 struct {
662 __le16 l_i_blocks_high; /* were l_i_reserved1 */
663 __le16 l_i_file_acl_high;
664 __le16 l_i_uid_high; /* these 2 fields */
665 __le16 l_i_gid_high; /* were reserved2[0] */
666 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
667 __le16 l_i_reserved;
668 } linux2;
669 struct {
670 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
671 __u16 h_i_mode_high;
672 __u16 h_i_uid_high;
673 __u16 h_i_gid_high;
674 __u32 h_i_author;
675 } hurd2;
676 struct {
677 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
678 __le16 m_i_file_acl_high;
679 __u32 m_i_reserved2[2];
680 } masix2;
681 } osd2; /* OS dependent 2 */
682 __le16 i_extra_isize;
683 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
684 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
685 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
686 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
687 __le32 i_crtime; /* File Creation time */
688 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
689 __le32 i_version_hi; /* high 32 bits for 64-bit version */
690};
691
692struct move_extent {
693 __u32 reserved; /* should be zero */
694 __u32 donor_fd; /* donor file descriptor */
695 __u64 orig_start; /* logical start offset in block for orig */
696 __u64 donor_start; /* logical start offset in block for donor */
697 __u64 len; /* block length to be moved */
698 __u64 moved_len; /* moved block length */
699};
700
701#define EXT4_EPOCH_BITS 2
702#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
703#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
704
705/*
706 * Extended fields will fit into an inode if the filesystem was formatted
707 * with large inodes (-I 256 or larger) and there are not currently any EAs
708 * consuming all of the available space. For new inodes we always reserve
709 * enough space for the kernel's known extended fields, but for inodes
710 * created with an old kernel this might not have been the case. None of
711 * the extended inode fields is critical for correct filesystem operation.
712 * This macro checks if a certain field fits in the inode. Note that
713 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
714 */
715#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
716 ((offsetof(typeof(*ext4_inode), field) + \
717 sizeof((ext4_inode)->field)) \
718 <= (EXT4_GOOD_OLD_INODE_SIZE + \
719 (einode)->i_extra_isize)) \
720
721static inline __le32 ext4_encode_extra_time(struct timespec *time)
722{
723 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
724 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
725 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
726}
727
728static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
729{
730 if (sizeof(time->tv_sec) > 4)
731 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
732 << 32;
733 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
734}
735
736#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
737do { \
738 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
739 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
740 (raw_inode)->xtime ## _extra = \
741 ext4_encode_extra_time(&(inode)->xtime); \
742} while (0)
743
744#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
745do { \
746 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
747 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
748 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
749 (raw_inode)->xtime ## _extra = \
750 ext4_encode_extra_time(&(einode)->xtime); \
751} while (0)
752
753#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
754do { \
755 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
756 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
757 ext4_decode_extra_time(&(inode)->xtime, \
758 raw_inode->xtime ## _extra); \
759 else \
760 (inode)->xtime.tv_nsec = 0; \
761} while (0)
762
763#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
764do { \
765 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
766 (einode)->xtime.tv_sec = \
767 (signed)le32_to_cpu((raw_inode)->xtime); \
768 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
769 ext4_decode_extra_time(&(einode)->xtime, \
770 raw_inode->xtime ## _extra); \
771 else \
772 (einode)->xtime.tv_nsec = 0; \
773} while (0)
774
775#define i_disk_version osd1.linux1.l_i_version
776
777#if defined(__KERNEL__) || defined(__linux__)
778#define i_reserved1 osd1.linux1.l_i_reserved1
779#define i_file_acl_high osd2.linux2.l_i_file_acl_high
780#define i_blocks_high osd2.linux2.l_i_blocks_high
781#define i_uid_low i_uid
782#define i_gid_low i_gid
783#define i_uid_high osd2.linux2.l_i_uid_high
784#define i_gid_high osd2.linux2.l_i_gid_high
785#define i_checksum_lo osd2.linux2.l_i_checksum_lo
786
787#elif defined(__GNU__)
788
789#define i_translator osd1.hurd1.h_i_translator
790#define i_uid_high osd2.hurd2.h_i_uid_high
791#define i_gid_high osd2.hurd2.h_i_gid_high
792#define i_author osd2.hurd2.h_i_author
793
794#elif defined(__masix__)
795
796#define i_reserved1 osd1.masix1.m_i_reserved1
797#define i_file_acl_high osd2.masix2.m_i_file_acl_high
798#define i_reserved2 osd2.masix2.m_i_reserved2
799
800#endif /* defined(__KERNEL__) || defined(__linux__) */
801
802/*
803 * storage for cached extent
804 * If ec_len == 0, then the cache is invalid.
805 * If ec_start == 0, then the cache represents a gap (null mapping)
806 */
807struct ext4_ext_cache {
808 ext4_fsblk_t ec_start;
809 ext4_lblk_t ec_block;
810 __u32 ec_len; /* must be 32bit to return holes */
811};
812
813/*
814 * fourth extended file system inode data in memory
815 */
816struct ext4_inode_info {
817 __le32 i_data[15]; /* unconverted */
818 __u32 i_dtime;
819 ext4_fsblk_t i_file_acl;
820
821 /*
822 * i_block_group is the number of the block group which contains
823 * this file's inode. Constant across the lifetime of the inode,
824 * it is ued for making block allocation decisions - we try to
825 * place a file's data blocks near its inode block, and new inodes
826 * near to their parent directory's inode.
827 */
828 ext4_group_t i_block_group;
829 ext4_lblk_t i_dir_start_lookup;
830#if (BITS_PER_LONG < 64)
831 unsigned long i_state_flags; /* Dynamic state flags */
832#endif
833 unsigned long i_flags;
834
835#ifdef CONFIG_EXT4_FS_XATTR
836 /*
837 * Extended attributes can be read independently of the main file
838 * data. Taking i_mutex even when reading would cause contention
839 * between readers of EAs and writers of regular file data, so
840 * instead we synchronize on xattr_sem when reading or changing
841 * EAs.
842 */
843 struct rw_semaphore xattr_sem;
844#endif
845
846 struct list_head i_orphan; /* unlinked but open inodes */
847
848 /*
849 * i_disksize keeps track of what the inode size is ON DISK, not
850 * in memory. During truncate, i_size is set to the new size by
851 * the VFS prior to calling ext4_truncate(), but the filesystem won't
852 * set i_disksize to 0 until the truncate is actually under way.
853 *
854 * The intent is that i_disksize always represents the blocks which
855 * are used by this file. This allows recovery to restart truncate
856 * on orphans if we crash during truncate. We actually write i_disksize
857 * into the on-disk inode when writing inodes out, instead of i_size.
858 *
859 * The only time when i_disksize and i_size may be different is when
860 * a truncate is in progress. The only things which change i_disksize
861 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
862 */
863 loff_t i_disksize;
864
865 /*
866 * i_data_sem is for serialising ext4_truncate() against
867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
868 * data tree are chopped off during truncate. We can't do that in
869 * ext4 because whenever we perform intermediate commits during
870 * truncate, the inode and all the metadata blocks *must* be in a
871 * consistent state which allows truncation of the orphans to restart
872 * during recovery. Hence we must fix the get_block-vs-truncate race
873 * by other means, so we have i_data_sem.
874 */
875 struct rw_semaphore i_data_sem;
876 struct inode vfs_inode;
877 struct jbd2_inode *jinode;
878
879 struct ext4_ext_cache i_cached_extent;
880 /*
881 * File creation time. Its function is same as that of
882 * struct timespec i_{a,c,m}time in the generic inode.
883 */
884 struct timespec i_crtime;
885
886 /* mballoc */
887 struct list_head i_prealloc_list;
888 spinlock_t i_prealloc_lock;
889
890 /* ialloc */
891 ext4_group_t i_last_alloc_group;
892
893 /* allocation reservation info for delalloc */
894 /* In case of bigalloc, these refer to clusters rather than blocks */
895 unsigned int i_reserved_data_blocks;
896 unsigned int i_reserved_meta_blocks;
897 unsigned int i_allocated_meta_blocks;
898 ext4_lblk_t i_da_metadata_calc_last_lblock;
899 int i_da_metadata_calc_len;
900
901 /* on-disk additional length */
902 __u16 i_extra_isize;
903
904#ifdef CONFIG_QUOTA
905 /* quota space reservation, managed internally by quota code */
906 qsize_t i_reserved_quota;
907#endif
908
909 /* completed IOs that might need unwritten extents handling */
910 struct list_head i_completed_io_list;
911 spinlock_t i_completed_io_lock;
912 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
913 /* current io_end structure for async DIO write*/
914 ext4_io_end_t *cur_aio_dio;
915 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
916
917 spinlock_t i_block_reservation_lock;
918
919 /*
920 * Transactions that contain inode's metadata needed to complete
921 * fsync and fdatasync, respectively.
922 */
923 tid_t i_sync_tid;
924 tid_t i_datasync_tid;
925
926 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
927 __u32 i_csum_seed;
928};
929
930/*
931 * File system states
932 */
933#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
934#define EXT4_ERROR_FS 0x0002 /* Errors detected */
935#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
936
937/*
938 * Misc. filesystem flags
939 */
940#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
941#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
942#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
943
944/*
945 * Mount flags
946 */
947#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
948#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
949#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
950#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
951#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
952#define EXT4_MOUNT_ERRORS_MASK 0x00070
953#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
954#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
955#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
956#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
957#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
958#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
959#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
960#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
961#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
962#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
963#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
964#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
965#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
966#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
967#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
968#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
969#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
970#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
971#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
972#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
973#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
974#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
975#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
976#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
977
978#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
979 specified delalloc */
980
981#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
982 ~EXT4_MOUNT_##opt
983#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
984 EXT4_MOUNT_##opt
985#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
986 EXT4_MOUNT_##opt)
987
988#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
989 ~EXT4_MOUNT2_##opt
990#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
991 EXT4_MOUNT2_##opt
992#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
993 EXT4_MOUNT2_##opt)
994
995#define ext4_test_and_set_bit __test_and_set_bit_le
996#define ext4_set_bit __set_bit_le
997#define ext4_set_bit_atomic ext2_set_bit_atomic
998#define ext4_test_and_clear_bit __test_and_clear_bit_le
999#define ext4_clear_bit __clear_bit_le
1000#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1001#define ext4_test_bit test_bit_le
1002#define ext4_find_next_zero_bit find_next_zero_bit_le
1003#define ext4_find_next_bit find_next_bit_le
1004
1005extern void ext4_set_bits(void *bm, int cur, int len);
1006
1007/*
1008 * Maximal mount counts between two filesystem checks
1009 */
1010#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1011#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1012
1013/*
1014 * Behaviour when detecting errors
1015 */
1016#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1017#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1018#define EXT4_ERRORS_PANIC 3 /* Panic */
1019#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1020
1021/* Metadata checksum algorithm codes */
1022#define EXT4_CRC32C_CHKSUM 1
1023
1024/*
1025 * Structure of the super block
1026 */
1027struct ext4_super_block {
1028/*00*/ __le32 s_inodes_count; /* Inodes count */
1029 __le32 s_blocks_count_lo; /* Blocks count */
1030 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1031 __le32 s_free_blocks_count_lo; /* Free blocks count */
1032/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1033 __le32 s_first_data_block; /* First Data Block */
1034 __le32 s_log_block_size; /* Block size */
1035 __le32 s_log_cluster_size; /* Allocation cluster size */
1036/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1037 __le32 s_clusters_per_group; /* # Clusters per group */
1038 __le32 s_inodes_per_group; /* # Inodes per group */
1039 __le32 s_mtime; /* Mount time */
1040/*30*/ __le32 s_wtime; /* Write time */
1041 __le16 s_mnt_count; /* Mount count */
1042 __le16 s_max_mnt_count; /* Maximal mount count */
1043 __le16 s_magic; /* Magic signature */
1044 __le16 s_state; /* File system state */
1045 __le16 s_errors; /* Behaviour when detecting errors */
1046 __le16 s_minor_rev_level; /* minor revision level */
1047/*40*/ __le32 s_lastcheck; /* time of last check */
1048 __le32 s_checkinterval; /* max. time between checks */
1049 __le32 s_creator_os; /* OS */
1050 __le32 s_rev_level; /* Revision level */
1051/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1052 __le16 s_def_resgid; /* Default gid for reserved blocks */
1053 /*
1054 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1055 *
1056 * Note: the difference between the compatible feature set and
1057 * the incompatible feature set is that if there is a bit set
1058 * in the incompatible feature set that the kernel doesn't
1059 * know about, it should refuse to mount the filesystem.
1060 *
1061 * e2fsck's requirements are more strict; if it doesn't know
1062 * about a feature in either the compatible or incompatible
1063 * feature set, it must abort and not try to meddle with
1064 * things it doesn't understand...
1065 */
1066 __le32 s_first_ino; /* First non-reserved inode */
1067 __le16 s_inode_size; /* size of inode structure */
1068 __le16 s_block_group_nr; /* block group # of this superblock */
1069 __le32 s_feature_compat; /* compatible feature set */
1070/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1071 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1072/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1073/*78*/ char s_volume_name[16]; /* volume name */
1074/*88*/ char s_last_mounted[64]; /* directory where last mounted */
1075/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1076 /*
1077 * Performance hints. Directory preallocation should only
1078 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1079 */
1080 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1081 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1082 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1083 /*
1084 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1085 */
1086/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1087/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1088 __le32 s_journal_dev; /* device number of journal file */
1089 __le32 s_last_orphan; /* start of list of inodes to delete */
1090 __le32 s_hash_seed[4]; /* HTREE hash seed */
1091 __u8 s_def_hash_version; /* Default hash version to use */
1092 __u8 s_jnl_backup_type;
1093 __le16 s_desc_size; /* size of group descriptor */
1094/*100*/ __le32 s_default_mount_opts;
1095 __le32 s_first_meta_bg; /* First metablock block group */
1096 __le32 s_mkfs_time; /* When the filesystem was created */
1097 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1098 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1099/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1100 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1101 __le32 s_free_blocks_count_hi; /* Free blocks count */
1102 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1103 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1104 __le32 s_flags; /* Miscellaneous flags */
1105 __le16 s_raid_stride; /* RAID stride */
1106 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1107 __le64 s_mmp_block; /* Block for multi-mount protection */
1108 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1109 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1110 __u8 s_checksum_type; /* metadata checksum algorithm used */
1111 __le16 s_reserved_pad;
1112 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1113 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1114 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1115 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1116 snapshot's future use */
1117 __le32 s_snapshot_list; /* inode number of the head of the
1118 on-disk snapshot list */
1119#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1120 __le32 s_error_count; /* number of fs errors */
1121 __le32 s_first_error_time; /* first time an error happened */
1122 __le32 s_first_error_ino; /* inode involved in first error */
1123 __le64 s_first_error_block; /* block involved of first error */
1124 __u8 s_first_error_func[32]; /* function where the error happened */
1125 __le32 s_first_error_line; /* line number where error happened */
1126 __le32 s_last_error_time; /* most recent time of an error */
1127 __le32 s_last_error_ino; /* inode involved in last error */
1128 __le32 s_last_error_line; /* line number where error happened */
1129 __le64 s_last_error_block; /* block involved of last error */
1130 __u8 s_last_error_func[32]; /* function where the error happened */
1131#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1132 __u8 s_mount_opts[64];
1133 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1134 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1135 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1136 __le32 s_reserved[108]; /* Padding to the end of the block */
1137 __le32 s_checksum; /* crc32c(superblock) */
1138};
1139
1140#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1141
1142#ifdef __KERNEL__
1143
1144/*
1145 * run-time mount flags
1146 */
1147#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1148#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1149
1150/*
1151 * fourth extended-fs super-block data in memory
1152 */
1153struct ext4_sb_info {
1154 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1155 unsigned long s_inodes_per_block;/* Number of inodes per block */
1156 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1157 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1158 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1159 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1160 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1161 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1162 ext4_group_t s_groups_count; /* Number of groups in the fs */
1163 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1164 unsigned long s_overhead; /* # of fs overhead clusters */
1165 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1166 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1167 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1168 struct buffer_head * s_sbh; /* Buffer containing the super block */
1169 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1170 struct buffer_head **s_group_desc;
1171 unsigned int s_mount_opt;
1172 unsigned int s_mount_opt2;
1173 unsigned int s_mount_flags;
1174 unsigned int s_def_mount_opt;
1175 ext4_fsblk_t s_sb_block;
1176 kuid_t s_resuid;
1177 kgid_t s_resgid;
1178 unsigned short s_mount_state;
1179 unsigned short s_pad;
1180 int s_addr_per_block_bits;
1181 int s_desc_per_block_bits;
1182 int s_inode_size;
1183 int s_first_ino;
1184 unsigned int s_inode_readahead_blks;
1185 unsigned int s_inode_goal;
1186 spinlock_t s_next_gen_lock;
1187 u32 s_next_generation;
1188 u32 s_hash_seed[4];
1189 int s_def_hash_version;
1190 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1191 struct percpu_counter s_freeclusters_counter;
1192 struct percpu_counter s_freeinodes_counter;
1193 struct percpu_counter s_dirs_counter;
1194 struct percpu_counter s_dirtyclusters_counter;
1195 struct blockgroup_lock *s_blockgroup_lock;
1196 struct proc_dir_entry *s_proc;
1197 struct kobject s_kobj;
1198 struct completion s_kobj_unregister;
1199 struct super_block *s_sb;
1200
1201 /* Journaling */
1202 struct journal_s *s_journal;
1203 struct list_head s_orphan;
1204 struct mutex s_orphan_lock;
1205 unsigned long s_resize_flags; /* Flags indicating if there
1206 is a resizer */
1207 unsigned long s_commit_interval;
1208 u32 s_max_batch_time;
1209 u32 s_min_batch_time;
1210 struct block_device *journal_bdev;
1211#ifdef CONFIG_QUOTA
1212 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1213 int s_jquota_fmt; /* Format of quota to use */
1214#endif
1215 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1216 struct rb_root system_blks;
1217
1218#ifdef EXTENTS_STATS
1219 /* ext4 extents stats */
1220 unsigned long s_ext_min;
1221 unsigned long s_ext_max;
1222 unsigned long s_depth_max;
1223 spinlock_t s_ext_stats_lock;
1224 unsigned long s_ext_blocks;
1225 unsigned long s_ext_extents;
1226#endif
1227
1228 /* for buddy allocator */
1229 struct ext4_group_info ***s_group_info;
1230 struct inode *s_buddy_cache;
1231 spinlock_t s_md_lock;
1232 unsigned short *s_mb_offsets;
1233 unsigned int *s_mb_maxs;
1234
1235 /* tunables */
1236 unsigned long s_stripe;
1237 unsigned int s_mb_stream_request;
1238 unsigned int s_mb_max_to_scan;
1239 unsigned int s_mb_min_to_scan;
1240 unsigned int s_mb_stats;
1241 unsigned int s_mb_order2_reqs;
1242 unsigned int s_mb_group_prealloc;
1243 unsigned int s_max_writeback_mb_bump;
1244 /* where last allocation was done - for stream allocation */
1245 unsigned long s_mb_last_group;
1246 unsigned long s_mb_last_start;
1247
1248 /* stats for buddy allocator */
1249 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1250 atomic_t s_bal_success; /* we found long enough chunks */
1251 atomic_t s_bal_allocated; /* in blocks */
1252 atomic_t s_bal_ex_scanned; /* total extents scanned */
1253 atomic_t s_bal_goals; /* goal hits */
1254 atomic_t s_bal_breaks; /* too long searches */
1255 atomic_t s_bal_2orders; /* 2^order hits */
1256 spinlock_t s_bal_lock;
1257 unsigned long s_mb_buddies_generated;
1258 unsigned long long s_mb_generation_time;
1259 atomic_t s_mb_lost_chunks;
1260 atomic_t s_mb_preallocated;
1261 atomic_t s_mb_discarded;
1262 atomic_t s_lock_busy;
1263
1264 /* locality groups */
1265 struct ext4_locality_group __percpu *s_locality_groups;
1266
1267 /* for write statistics */
1268 unsigned long s_sectors_written_start;
1269 u64 s_kbytes_written;
1270
1271 unsigned int s_log_groups_per_flex;
1272 struct flex_groups *s_flex_groups;
1273
1274 /* workqueue for dio unwritten */
1275 struct workqueue_struct *dio_unwritten_wq;
1276
1277 /* timer for periodic error stats printing */
1278 struct timer_list s_err_report;
1279
1280 /* Lazy inode table initialization info */
1281 struct ext4_li_request *s_li_request;
1282 /* Wait multiplier for lazy initialization thread */
1283 unsigned int s_li_wait_mult;
1284
1285 /* Kernel thread for multiple mount protection */
1286 struct task_struct *s_mmp_tsk;
1287
1288 /* record the last minlen when FITRIM is called. */
1289 atomic_t s_last_trim_minblks;
1290
1291 /* Reference to checksum algorithm driver via cryptoapi */
1292 struct crypto_shash *s_chksum_driver;
1293
1294 /* Precomputed FS UUID checksum for seeding other checksums */
1295 __u32 s_csum_seed;
1296};
1297
1298static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1299{
1300 return sb->s_fs_info;
1301}
1302static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1303{
1304 return container_of(inode, struct ext4_inode_info, vfs_inode);
1305}
1306
1307static inline struct timespec ext4_current_time(struct inode *inode)
1308{
1309 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1310 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1311}
1312
1313static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1314{
1315 return ino == EXT4_ROOT_INO ||
1316 ino == EXT4_JOURNAL_INO ||
1317 ino == EXT4_RESIZE_INO ||
1318 (ino >= EXT4_FIRST_INO(sb) &&
1319 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1320}
1321
1322static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1323 struct ext4_io_end *io_end)
1324{
1325 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1326 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1327 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
1328 }
1329}
1330
1331/*
1332 * Inode dynamic state flags
1333 */
1334enum {
1335 EXT4_STATE_JDATA, /* journaled data exists */
1336 EXT4_STATE_NEW, /* inode is newly created */
1337 EXT4_STATE_XATTR, /* has in-inode xattrs */
1338 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1339 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1340 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1341 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1342 EXT4_STATE_NEWENTRY, /* File just added to dir */
1343 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1344};
1345
1346#define EXT4_INODE_BIT_FNS(name, field, offset) \
1347static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1348{ \
1349 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1350} \
1351static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1352{ \
1353 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1354} \
1355static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1356{ \
1357 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1358}
1359
1360EXT4_INODE_BIT_FNS(flag, flags, 0)
1361#if (BITS_PER_LONG < 64)
1362EXT4_INODE_BIT_FNS(state, state_flags, 0)
1363
1364static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1365{
1366 (ei)->i_state_flags = 0;
1367}
1368#else
1369EXT4_INODE_BIT_FNS(state, flags, 32)
1370
1371static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1372{
1373 /* We depend on the fact that callers will set i_flags */
1374}
1375#endif
1376#else
1377/* Assume that user mode programs are passing in an ext4fs superblock, not
1378 * a kernel struct super_block. This will allow us to call the feature-test
1379 * macros from user land. */
1380#define EXT4_SB(sb) (sb)
1381#endif
1382
1383#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1384
1385/*
1386 * Codes for operating systems
1387 */
1388#define EXT4_OS_LINUX 0
1389#define EXT4_OS_HURD 1
1390#define EXT4_OS_MASIX 2
1391#define EXT4_OS_FREEBSD 3
1392#define EXT4_OS_LITES 4
1393
1394/*
1395 * Revision levels
1396 */
1397#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1398#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1399
1400#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1401#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1402
1403#define EXT4_GOOD_OLD_INODE_SIZE 128
1404
1405/*
1406 * Feature set definitions
1407 */
1408
1409#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1410 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1411#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1412 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1413#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1414 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1415#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1416 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1417#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1418 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1419#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1420 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1421#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1422 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1423#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1424 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1425#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1426 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1427
1428#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1429#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1430#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1431#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1432#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1433#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1434
1435#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1436#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1437#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1438#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1439#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1440#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1441#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1442#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1443#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1444/*
1445 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1446 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1447 * all other data structures' checksums. However, the METADATA_CSUM and
1448 * GDT_CSUM bits are mutually exclusive.
1449 */
1450#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1451
1452#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1453#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1454#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1455#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1456#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1457#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1458#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1459#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1460#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1461#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1462#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1463#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1464#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1465#define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */
1466
1467#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1468#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1469 EXT4_FEATURE_INCOMPAT_META_BG)
1470#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1471 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1472 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1473
1474#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1475#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1476 EXT4_FEATURE_INCOMPAT_RECOVER| \
1477 EXT4_FEATURE_INCOMPAT_META_BG)
1478#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1479 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1480 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1481
1482#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1483#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1484 EXT4_FEATURE_INCOMPAT_RECOVER| \
1485 EXT4_FEATURE_INCOMPAT_META_BG| \
1486 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1487 EXT4_FEATURE_INCOMPAT_64BIT| \
1488 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1489 EXT4_FEATURE_INCOMPAT_MMP)
1490#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1491 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1492 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1493 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1494 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1495 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1496 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1497 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1498 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
1499
1500/*
1501 * Default values for user and/or group using reserved blocks
1502 */
1503#define EXT4_DEF_RESUID 0
1504#define EXT4_DEF_RESGID 0
1505
1506#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1507
1508/*
1509 * Default mount options
1510 */
1511#define EXT4_DEFM_DEBUG 0x0001
1512#define EXT4_DEFM_BSDGROUPS 0x0002
1513#define EXT4_DEFM_XATTR_USER 0x0004
1514#define EXT4_DEFM_ACL 0x0008
1515#define EXT4_DEFM_UID16 0x0010
1516#define EXT4_DEFM_JMODE 0x0060
1517#define EXT4_DEFM_JMODE_DATA 0x0020
1518#define EXT4_DEFM_JMODE_ORDERED 0x0040
1519#define EXT4_DEFM_JMODE_WBACK 0x0060
1520#define EXT4_DEFM_NOBARRIER 0x0100
1521#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1522#define EXT4_DEFM_DISCARD 0x0400
1523#define EXT4_DEFM_NODELALLOC 0x0800
1524
1525/*
1526 * Default journal batch times
1527 */
1528#define EXT4_DEF_MIN_BATCH_TIME 0
1529#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1530
1531/*
1532 * Minimum number of groups in a flexgroup before we separate out
1533 * directories into the first block group of a flexgroup
1534 */
1535#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1536
1537/*
1538 * Structure of a directory entry
1539 */
1540#define EXT4_NAME_LEN 255
1541
1542struct ext4_dir_entry {
1543 __le32 inode; /* Inode number */
1544 __le16 rec_len; /* Directory entry length */
1545 __le16 name_len; /* Name length */
1546 char name[EXT4_NAME_LEN]; /* File name */
1547};
1548
1549/*
1550 * The new version of the directory entry. Since EXT4 structures are
1551 * stored in intel byte order, and the name_len field could never be
1552 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1553 * file_type field.
1554 */
1555struct ext4_dir_entry_2 {
1556 __le32 inode; /* Inode number */
1557 __le16 rec_len; /* Directory entry length */
1558 __u8 name_len; /* Name length */
1559 __u8 file_type;
1560 char name[EXT4_NAME_LEN]; /* File name */
1561};
1562
1563/*
1564 * This is a bogus directory entry at the end of each leaf block that
1565 * records checksums.
1566 */
1567struct ext4_dir_entry_tail {
1568 __le32 det_reserved_zero1; /* Pretend to be unused */
1569 __le16 det_rec_len; /* 12 */
1570 __u8 det_reserved_zero2; /* Zero name length */
1571 __u8 det_reserved_ft; /* 0xDE, fake file type */
1572 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1573};
1574
1575/*
1576 * Ext4 directory file types. Only the low 3 bits are used. The
1577 * other bits are reserved for now.
1578 */
1579#define EXT4_FT_UNKNOWN 0
1580#define EXT4_FT_REG_FILE 1
1581#define EXT4_FT_DIR 2
1582#define EXT4_FT_CHRDEV 3
1583#define EXT4_FT_BLKDEV 4
1584#define EXT4_FT_FIFO 5
1585#define EXT4_FT_SOCK 6
1586#define EXT4_FT_SYMLINK 7
1587
1588#define EXT4_FT_MAX 8
1589
1590#define EXT4_FT_DIR_CSUM 0xDE
1591
1592/*
1593 * EXT4_DIR_PAD defines the directory entries boundaries
1594 *
1595 * NOTE: It must be a multiple of 4
1596 */
1597#define EXT4_DIR_PAD 4
1598#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1599#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1600 ~EXT4_DIR_ROUND)
1601#define EXT4_MAX_REC_LEN ((1<<16)-1)
1602
1603/*
1604 * If we ever get support for fs block sizes > page_size, we'll need
1605 * to remove the #if statements in the next two functions...
1606 */
1607static inline unsigned int
1608ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1609{
1610 unsigned len = le16_to_cpu(dlen);
1611
1612#if (PAGE_CACHE_SIZE >= 65536)
1613 if (len == EXT4_MAX_REC_LEN || len == 0)
1614 return blocksize;
1615 return (len & 65532) | ((len & 3) << 16);
1616#else
1617 return len;
1618#endif
1619}
1620
1621static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1622{
1623 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1624 BUG();
1625#if (PAGE_CACHE_SIZE >= 65536)
1626 if (len < 65536)
1627 return cpu_to_le16(len);
1628 if (len == blocksize) {
1629 if (blocksize == 65536)
1630 return cpu_to_le16(EXT4_MAX_REC_LEN);
1631 else
1632 return cpu_to_le16(0);
1633 }
1634 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1635#else
1636 return cpu_to_le16(len);
1637#endif
1638}
1639
1640/*
1641 * Hash Tree Directory indexing
1642 * (c) Daniel Phillips, 2001
1643 */
1644
1645#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1646 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1647 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1648#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1649#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1650
1651/* Legal values for the dx_root hash_version field: */
1652
1653#define DX_HASH_LEGACY 0
1654#define DX_HASH_HALF_MD4 1
1655#define DX_HASH_TEA 2
1656#define DX_HASH_LEGACY_UNSIGNED 3
1657#define DX_HASH_HALF_MD4_UNSIGNED 4
1658#define DX_HASH_TEA_UNSIGNED 5
1659
1660static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1661 const void *address, unsigned int length)
1662{
1663 struct {
1664 struct shash_desc shash;
1665 char ctx[crypto_shash_descsize(sbi->s_chksum_driver)];
1666 } desc;
1667 int err;
1668
1669 desc.shash.tfm = sbi->s_chksum_driver;
1670 desc.shash.flags = 0;
1671 *(u32 *)desc.ctx = crc;
1672
1673 err = crypto_shash_update(&desc.shash, address, length);
1674 BUG_ON(err);
1675
1676 return *(u32 *)desc.ctx;
1677}
1678
1679#ifdef __KERNEL__
1680
1681/* hash info structure used by the directory hash */
1682struct dx_hash_info
1683{
1684 u32 hash;
1685 u32 minor_hash;
1686 int hash_version;
1687 u32 *seed;
1688};
1689
1690
1691/* 32 and 64 bit signed EOF for dx directories */
1692#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1693#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1694
1695
1696/*
1697 * Control parameters used by ext4_htree_next_block
1698 */
1699#define HASH_NB_ALWAYS 1
1700
1701
1702/*
1703 * Describe an inode's exact location on disk and in memory
1704 */
1705struct ext4_iloc
1706{
1707 struct buffer_head *bh;
1708 unsigned long offset;
1709 ext4_group_t block_group;
1710};
1711
1712static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1713{
1714 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1715}
1716
1717/*
1718 * This structure is stuffed into the struct file's private_data field
1719 * for directories. It is where we put information so that we can do
1720 * readdir operations in hash tree order.
1721 */
1722struct dir_private_info {
1723 struct rb_root root;
1724 struct rb_node *curr_node;
1725 struct fname *extra_fname;
1726 loff_t last_pos;
1727 __u32 curr_hash;
1728 __u32 curr_minor_hash;
1729 __u32 next_hash;
1730};
1731
1732/* calculate the first block number of the group */
1733static inline ext4_fsblk_t
1734ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1735{
1736 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1737 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1738}
1739
1740/*
1741 * Special error return code only used by dx_probe() and its callers.
1742 */
1743#define ERR_BAD_DX_DIR -75000
1744
1745void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1746 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1747
1748/*
1749 * Timeout and state flag for lazy initialization inode thread.
1750 */
1751#define EXT4_DEF_LI_WAIT_MULT 10
1752#define EXT4_DEF_LI_MAX_START_DELAY 5
1753#define EXT4_LAZYINIT_QUIT 0x0001
1754#define EXT4_LAZYINIT_RUNNING 0x0002
1755
1756/*
1757 * Lazy inode table initialization info
1758 */
1759struct ext4_lazy_init {
1760 unsigned long li_state;
1761 struct list_head li_request_list;
1762 struct mutex li_list_mtx;
1763};
1764
1765struct ext4_li_request {
1766 struct super_block *lr_super;
1767 struct ext4_sb_info *lr_sbi;
1768 ext4_group_t lr_next_group;
1769 struct list_head lr_request;
1770 unsigned long lr_next_sched;
1771 unsigned long lr_timeout;
1772};
1773
1774struct ext4_features {
1775 struct kobject f_kobj;
1776 struct completion f_kobj_unregister;
1777};
1778
1779/*
1780 * This structure will be used for multiple mount protection. It will be
1781 * written into the block number saved in the s_mmp_block field in the
1782 * superblock. Programs that check MMP should assume that if
1783 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1784 * to use the filesystem, regardless of how old the timestamp is.
1785 */
1786#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1787#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1788#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1789#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1790
1791struct mmp_struct {
1792 __le32 mmp_magic; /* Magic number for MMP */
1793 __le32 mmp_seq; /* Sequence no. updated periodically */
1794
1795 /*
1796 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1797 * purposes and do not affect the correctness of the algorithm
1798 */
1799 __le64 mmp_time; /* Time last updated */
1800 char mmp_nodename[64]; /* Node which last updated MMP block */
1801 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1802
1803 /*
1804 * mmp_check_interval is used to verify if the MMP block has been
1805 * updated on the block device. The value is updated based on the
1806 * maximum time to write the MMP block during an update cycle.
1807 */
1808 __le16 mmp_check_interval;
1809
1810 __le16 mmp_pad1;
1811 __le32 mmp_pad2[226];
1812 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1813};
1814
1815/* arguments passed to the mmp thread */
1816struct mmpd_data {
1817 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1818 struct super_block *sb; /* super block of the fs */
1819};
1820
1821/*
1822 * Check interval multiplier
1823 * The MMP block is written every update interval and initially checked every
1824 * update interval x the multiplier (the value is then adapted based on the
1825 * write latency). The reason is that writes can be delayed under load and we
1826 * don't want readers to incorrectly assume that the filesystem is no longer
1827 * in use.
1828 */
1829#define EXT4_MMP_CHECK_MULT 2UL
1830
1831/*
1832 * Minimum interval for MMP checking in seconds.
1833 */
1834#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1835
1836/*
1837 * Maximum interval for MMP checking in seconds.
1838 */
1839#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1840
1841/*
1842 * Function prototypes
1843 */
1844
1845/*
1846 * Ok, these declarations are also in <linux/kernel.h> but none of the
1847 * ext4 source programs needs to include it so they are duplicated here.
1848 */
1849# define NORET_TYPE /**/
1850# define ATTRIB_NORET __attribute__((noreturn))
1851# define NORET_AND noreturn,
1852
1853/* bitmap.c */
1854extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1855void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1856 struct ext4_group_desc *gdp,
1857 struct buffer_head *bh, int sz);
1858int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1859 struct ext4_group_desc *gdp,
1860 struct buffer_head *bh, int sz);
1861void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1862 struct ext4_group_desc *gdp,
1863 struct buffer_head *bh, int sz);
1864int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1865 struct ext4_group_desc *gdp,
1866 struct buffer_head *bh, int sz);
1867
1868/* balloc.c */
1869extern void ext4_validate_block_bitmap(struct super_block *sb,
1870 struct ext4_group_desc *desc,
1871 unsigned int block_group,
1872 struct buffer_head *bh);
1873extern unsigned int ext4_block_group(struct super_block *sb,
1874 ext4_fsblk_t blocknr);
1875extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1876 ext4_fsblk_t blocknr);
1877extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1878extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1879 ext4_group_t group);
1880extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1881 ext4_fsblk_t goal,
1882 unsigned int flags,
1883 unsigned long *count,
1884 int *errp);
1885extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1886 s64 nclusters, unsigned int flags);
1887extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1888extern void ext4_check_blocks_bitmap(struct super_block *);
1889extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1890 ext4_group_t block_group,
1891 struct buffer_head ** bh);
1892extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1893
1894extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1895 ext4_group_t block_group);
1896extern int ext4_wait_block_bitmap(struct super_block *sb,
1897 ext4_group_t block_group,
1898 struct buffer_head *bh);
1899extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1900 ext4_group_t block_group);
1901extern void ext4_init_block_bitmap(struct super_block *sb,
1902 struct buffer_head *bh,
1903 ext4_group_t group,
1904 struct ext4_group_desc *desc);
1905extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1906 ext4_group_t block_group,
1907 struct ext4_group_desc *gdp);
1908extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1909 ext4_group_t block_group,
1910 struct ext4_group_desc *gdp);
1911ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1912
1913/* dir.c */
1914extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1915 struct file *,
1916 struct ext4_dir_entry_2 *,
1917 struct buffer_head *, unsigned int);
1918#define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1919 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1920 (de), (bh), (offset)))
1921extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1922 __u32 minor_hash,
1923 struct ext4_dir_entry_2 *dirent);
1924extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1925
1926/* fsync.c */
1927extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1928extern int ext4_flush_completed_IO(struct inode *);
1929
1930/* hash.c */
1931extern int ext4fs_dirhash(const char *name, int len, struct
1932 dx_hash_info *hinfo);
1933
1934/* ialloc.c */
1935extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
1936 const struct qstr *qstr, __u32 goal,
1937 uid_t *owner);
1938extern void ext4_free_inode(handle_t *, struct inode *);
1939extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1940extern unsigned long ext4_count_free_inodes(struct super_block *);
1941extern unsigned long ext4_count_dirs(struct super_block *);
1942extern void ext4_check_inodes_bitmap(struct super_block *);
1943extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1944extern int ext4_init_inode_table(struct super_block *sb,
1945 ext4_group_t group, int barrier);
1946extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
1947
1948/* mballoc.c */
1949extern long ext4_mb_stats;
1950extern long ext4_mb_max_to_scan;
1951extern int ext4_mb_init(struct super_block *);
1952extern int ext4_mb_release(struct super_block *);
1953extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1954 struct ext4_allocation_request *, int *);
1955extern int ext4_mb_reserve_blocks(struct super_block *, int);
1956extern void ext4_discard_preallocations(struct inode *);
1957extern int __init ext4_init_mballoc(void);
1958extern void ext4_exit_mballoc(void);
1959extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1960 struct buffer_head *bh, ext4_fsblk_t block,
1961 unsigned long count, int flags);
1962extern int ext4_mb_add_groupinfo(struct super_block *sb,
1963 ext4_group_t i, struct ext4_group_desc *desc);
1964extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1965 ext4_fsblk_t block, unsigned long count);
1966extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1967
1968/* inode.c */
1969struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1970 ext4_lblk_t, int, int *);
1971struct buffer_head *ext4_bread(handle_t *, struct inode *,
1972 ext4_lblk_t, int, int *);
1973int ext4_get_block(struct inode *inode, sector_t iblock,
1974 struct buffer_head *bh_result, int create);
1975
1976extern struct inode *ext4_iget(struct super_block *, unsigned long);
1977extern int ext4_write_inode(struct inode *, struct writeback_control *);
1978extern int ext4_setattr(struct dentry *, struct iattr *);
1979extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1980 struct kstat *stat);
1981extern void ext4_evict_inode(struct inode *);
1982extern void ext4_clear_inode(struct inode *);
1983extern int ext4_sync_inode(handle_t *, struct inode *);
1984extern void ext4_dirty_inode(struct inode *, int);
1985extern int ext4_change_inode_journal_flag(struct inode *, int);
1986extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1987extern int ext4_can_truncate(struct inode *inode);
1988extern void ext4_truncate(struct inode *);
1989extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1990extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1991extern void ext4_set_inode_flags(struct inode *);
1992extern void ext4_get_inode_flags(struct ext4_inode_info *);
1993extern int ext4_alloc_da_blocks(struct inode *inode);
1994extern void ext4_set_aops(struct inode *inode);
1995extern int ext4_writepage_trans_blocks(struct inode *);
1996extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1997extern int ext4_discard_partial_page_buffers(handle_t *handle,
1998 struct address_space *mapping, loff_t from,
1999 loff_t length, int flags);
2000extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2001extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2002extern void ext4_da_update_reserve_space(struct inode *inode,
2003 int used, int quota_claim);
2004
2005/* indirect.c */
2006extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2007 struct ext4_map_blocks *map, int flags);
2008extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2009 const struct iovec *iov, loff_t offset,
2010 unsigned long nr_segs);
2011extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2012extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
2013extern void ext4_ind_truncate(struct inode *inode);
2014
2015/* ioctl.c */
2016extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2017extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2018
2019/* migrate.c */
2020extern int ext4_ext_migrate(struct inode *);
2021
2022/* namei.c */
2023extern int ext4_dirent_csum_verify(struct inode *inode,
2024 struct ext4_dir_entry *dirent);
2025extern int ext4_orphan_add(handle_t *, struct inode *);
2026extern int ext4_orphan_del(handle_t *, struct inode *);
2027extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2028 __u32 start_minor_hash, __u32 *next_hash);
2029
2030/* resize.c */
2031extern int ext4_group_add(struct super_block *sb,
2032 struct ext4_new_group_data *input);
2033extern int ext4_group_extend(struct super_block *sb,
2034 struct ext4_super_block *es,
2035 ext4_fsblk_t n_blocks_count);
2036extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2037
2038/* super.c */
2039extern int ext4_calculate_overhead(struct super_block *sb);
2040extern int ext4_superblock_csum_verify(struct super_block *sb,
2041 struct ext4_super_block *es);
2042extern void ext4_superblock_csum_set(struct super_block *sb,
2043 struct ext4_super_block *es);
2044extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2045extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2046extern void ext4_kvfree(void *ptr);
2047extern __printf(4, 5)
2048void __ext4_error(struct super_block *, const char *, unsigned int,
2049 const char *, ...);
2050#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2051 __LINE__, ## message)
2052extern __printf(5, 6)
2053void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2054 const char *, ...);
2055extern __printf(5, 6)
2056void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2057 const char *, ...);
2058extern void __ext4_std_error(struct super_block *, const char *,
2059 unsigned int, int);
2060extern __printf(4, 5)
2061void __ext4_abort(struct super_block *, const char *, unsigned int,
2062 const char *, ...);
2063#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2064 __LINE__, ## message)
2065extern __printf(4, 5)
2066void __ext4_warning(struct super_block *, const char *, unsigned int,
2067 const char *, ...);
2068#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2069 __LINE__, ## message)
2070extern __printf(3, 4)
2071void ext4_msg(struct super_block *, const char *, const char *, ...);
2072extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2073 const char *, unsigned int, const char *);
2074#define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2075 __LINE__, msg)
2076extern __printf(7, 8)
2077void __ext4_grp_locked_error(const char *, unsigned int,
2078 struct super_block *, ext4_group_t,
2079 unsigned long, ext4_fsblk_t,
2080 const char *, ...);
2081#define ext4_grp_locked_error(sb, grp, message...) \
2082 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2083extern void ext4_update_dynamic_rev(struct super_block *sb);
2084extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2085 __u32 compat);
2086extern int ext4_update_rocompat_feature(handle_t *handle,
2087 struct super_block *sb, __u32 rocompat);
2088extern int ext4_update_incompat_feature(handle_t *handle,
2089 struct super_block *sb, __u32 incompat);
2090extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2091 struct ext4_group_desc *bg);
2092extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2093 struct ext4_group_desc *bg);
2094extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2095 struct ext4_group_desc *bg);
2096extern __u32 ext4_free_group_clusters(struct super_block *sb,
2097 struct ext4_group_desc *bg);
2098extern __u32 ext4_free_inodes_count(struct super_block *sb,
2099 struct ext4_group_desc *bg);
2100extern __u32 ext4_used_dirs_count(struct super_block *sb,
2101 struct ext4_group_desc *bg);
2102extern __u32 ext4_itable_unused_count(struct super_block *sb,
2103 struct ext4_group_desc *bg);
2104extern void ext4_block_bitmap_set(struct super_block *sb,
2105 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2106extern void ext4_inode_bitmap_set(struct super_block *sb,
2107 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2108extern void ext4_inode_table_set(struct super_block *sb,
2109 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2110extern void ext4_free_group_clusters_set(struct super_block *sb,
2111 struct ext4_group_desc *bg,
2112 __u32 count);
2113extern void ext4_free_inodes_set(struct super_block *sb,
2114 struct ext4_group_desc *bg, __u32 count);
2115extern void ext4_used_dirs_set(struct super_block *sb,
2116 struct ext4_group_desc *bg, __u32 count);
2117extern void ext4_itable_unused_set(struct super_block *sb,
2118 struct ext4_group_desc *bg, __u32 count);
2119extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2120 struct ext4_group_desc *gdp);
2121extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2122 struct ext4_group_desc *gdp);
2123
2124static inline int ext4_has_group_desc_csum(struct super_block *sb)
2125{
2126 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2127 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2128 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2129}
2130
2131static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2132{
2133 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2134 le32_to_cpu(es->s_blocks_count_lo);
2135}
2136
2137static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2138{
2139 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2140 le32_to_cpu(es->s_r_blocks_count_lo);
2141}
2142
2143static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2144{
2145 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2146 le32_to_cpu(es->s_free_blocks_count_lo);
2147}
2148
2149static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2150 ext4_fsblk_t blk)
2151{
2152 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2153 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2154}
2155
2156static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2157 ext4_fsblk_t blk)
2158{
2159 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2160 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2161}
2162
2163static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2164 ext4_fsblk_t blk)
2165{
2166 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2167 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2168}
2169
2170static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2171{
2172 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2173 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2174 le32_to_cpu(raw_inode->i_size_lo);
2175 else
2176 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2177}
2178
2179static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2180{
2181 raw_inode->i_size_lo = cpu_to_le32(i_size);
2182 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2183}
2184
2185static inline
2186struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2187 ext4_group_t group)
2188{
2189 struct ext4_group_info ***grp_info;
2190 long indexv, indexh;
2191 grp_info = EXT4_SB(sb)->s_group_info;
2192 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2193 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2194 return grp_info[indexv][indexh];
2195}
2196
2197/*
2198 * Reading s_groups_count requires using smp_rmb() afterwards. See
2199 * the locking protocol documented in the comments of ext4_group_add()
2200 * in resize.c
2201 */
2202static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2203{
2204 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2205
2206 smp_rmb();
2207 return ngroups;
2208}
2209
2210static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2211 ext4_group_t block_group)
2212{
2213 return block_group >> sbi->s_log_groups_per_flex;
2214}
2215
2216static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2217{
2218 return 1 << sbi->s_log_groups_per_flex;
2219}
2220
2221#define ext4_std_error(sb, errno) \
2222do { \
2223 if ((errno)) \
2224 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2225} while (0)
2226
2227#ifdef CONFIG_SMP
2228/* Each CPU can accumulate percpu_counter_batch clusters in their local
2229 * counters. So we need to make sure we have free clusters more
2230 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2231 */
2232#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2233#else
2234#define EXT4_FREECLUSTERS_WATERMARK 0
2235#endif
2236
2237static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2238{
2239 /*
2240 * XXX: replace with spinlock if seen contended -bzzz
2241 */
2242 down_write(&EXT4_I(inode)->i_data_sem);
2243 if (newsize > EXT4_I(inode)->i_disksize)
2244 EXT4_I(inode)->i_disksize = newsize;
2245 up_write(&EXT4_I(inode)->i_data_sem);
2246 return ;
2247}
2248
2249struct ext4_group_info {
2250 unsigned long bb_state;
2251 struct rb_root bb_free_root;
2252 ext4_grpblk_t bb_first_free; /* first free block */
2253 ext4_grpblk_t bb_free; /* total free blocks */
2254 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2255 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2256 struct list_head bb_prealloc_list;
2257#ifdef DOUBLE_CHECK
2258 void *bb_bitmap;
2259#endif
2260 struct rw_semaphore alloc_sem;
2261 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2262 * regions, index is order.
2263 * bb_counters[3] = 5 means
2264 * 5 free 8-block regions. */
2265};
2266
2267#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2268#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2269
2270#define EXT4_MB_GRP_NEED_INIT(grp) \
2271 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2272
2273#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2274 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2275#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2276 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2277#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2278 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2279
2280#define EXT4_MAX_CONTENTION 8
2281#define EXT4_CONTENTION_THRESHOLD 2
2282
2283static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2284 ext4_group_t group)
2285{
2286 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2287}
2288
2289/*
2290 * Returns true if the filesystem is busy enough that attempts to
2291 * access the block group locks has run into contention.
2292 */
2293static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2294{
2295 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2296}
2297
2298static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2299{
2300 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2301 if (spin_trylock(lock))
2302 /*
2303 * We're able to grab the lock right away, so drop the
2304 * lock contention counter.
2305 */
2306 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2307 else {
2308 /*
2309 * The lock is busy, so bump the contention counter,
2310 * and then wait on the spin lock.
2311 */
2312 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2313 EXT4_MAX_CONTENTION);
2314 spin_lock(lock);
2315 }
2316}
2317
2318static inline void ext4_unlock_group(struct super_block *sb,
2319 ext4_group_t group)
2320{
2321 spin_unlock(ext4_group_lock_ptr(sb, group));
2322}
2323
2324static inline void ext4_mark_super_dirty(struct super_block *sb)
2325{
2326 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
2327
2328 ext4_superblock_csum_set(sb, es);
2329 if (EXT4_SB(sb)->s_journal == NULL)
2330 sb->s_dirt =1;
2331}
2332
2333/*
2334 * Block validity checking
2335 */
2336#define ext4_check_indirect_blockref(inode, bh) \
2337 ext4_check_blockref(__func__, __LINE__, inode, \
2338 (__le32 *)(bh)->b_data, \
2339 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2340
2341#define ext4_ind_check_inode(inode) \
2342 ext4_check_blockref(__func__, __LINE__, inode, \
2343 EXT4_I(inode)->i_data, \
2344 EXT4_NDIR_BLOCKS)
2345
2346/*
2347 * Inodes and files operations
2348 */
2349
2350/* dir.c */
2351extern const struct file_operations ext4_dir_operations;
2352
2353/* file.c */
2354extern const struct inode_operations ext4_file_inode_operations;
2355extern const struct file_operations ext4_file_operations;
2356extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2357
2358/* namei.c */
2359extern const struct inode_operations ext4_dir_inode_operations;
2360extern const struct inode_operations ext4_special_inode_operations;
2361extern struct dentry *ext4_get_parent(struct dentry *child);
2362
2363/* symlink.c */
2364extern const struct inode_operations ext4_symlink_inode_operations;
2365extern const struct inode_operations ext4_fast_symlink_inode_operations;
2366
2367/* block_validity */
2368extern void ext4_release_system_zone(struct super_block *sb);
2369extern int ext4_setup_system_zone(struct super_block *sb);
2370extern int __init ext4_init_system_zone(void);
2371extern void ext4_exit_system_zone(void);
2372extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2373 ext4_fsblk_t start_blk,
2374 unsigned int count);
2375extern int ext4_check_blockref(const char *, unsigned int,
2376 struct inode *, __le32 *, unsigned int);
2377
2378/* extents.c */
2379extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2380extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2381extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2382 int chunk);
2383extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2384 struct ext4_map_blocks *map, int flags);
2385extern void ext4_ext_truncate(struct inode *);
2386extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2387 loff_t length);
2388extern void ext4_ext_init(struct super_block *);
2389extern void ext4_ext_release(struct super_block *);
2390extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2391 loff_t len);
2392extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2393 ssize_t len);
2394extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2395 struct ext4_map_blocks *map, int flags);
2396extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2397 __u64 start, __u64 len);
2398/* move_extent.c */
2399extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2400 __u64 start_orig, __u64 start_donor,
2401 __u64 len, __u64 *moved_len);
2402
2403/* page-io.c */
2404extern int __init ext4_init_pageio(void);
2405extern void ext4_exit_pageio(void);
2406extern void ext4_ioend_wait(struct inode *);
2407extern void ext4_free_io_end(ext4_io_end_t *io);
2408extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2409extern int ext4_end_io_nolock(ext4_io_end_t *io);
2410extern void ext4_io_submit(struct ext4_io_submit *io);
2411extern int ext4_bio_write_page(struct ext4_io_submit *io,
2412 struct page *page,
2413 int len,
2414 struct writeback_control *wbc);
2415
2416/* mmp.c */
2417extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2418extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2419extern int ext4_mmp_csum_verify(struct super_block *sb,
2420 struct mmp_struct *mmp);
2421
2422/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2423enum ext4_state_bits {
2424 BH_Uninit /* blocks are allocated but uninitialized on disk */
2425 = BH_JBDPrivateStart,
2426 BH_AllocFromCluster, /* allocated blocks were part of already
2427 * allocated cluster. Note that this flag will
2428 * never, ever appear in a buffer_head's state
2429 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2430 * this is used. */
2431 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This
2432 * flag is set when ext4_map_blocks is called on a
2433 * delayed allocated block to get its real mapping. */
2434};
2435
2436BUFFER_FNS(Uninit, uninit)
2437TAS_BUFFER_FNS(Uninit, uninit)
2438BUFFER_FNS(Da_Mapped, da_mapped)
2439
2440/*
2441 * Add new method to test wether block and inode bitmaps are properly
2442 * initialized. With uninit_bg reading the block from disk is not enough
2443 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2444 */
2445#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2446
2447static inline int bitmap_uptodate(struct buffer_head *bh)
2448{
2449 return (buffer_uptodate(bh) &&
2450 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2451}
2452static inline void set_bitmap_uptodate(struct buffer_head *bh)
2453{
2454 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2455}
2456
2457#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2458
2459/* For ioend & aio unwritten conversion wait queues */
2460#define EXT4_WQ_HASH_SZ 37
2461#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2462 EXT4_WQ_HASH_SZ])
2463#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2464 EXT4_WQ_HASH_SZ])
2465extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2466extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2467
2468#define EXT4_RESIZING 0
2469extern int ext4_resize_begin(struct super_block *sb);
2470extern void ext4_resize_end(struct super_block *sb);
2471
2472#endif /* __KERNEL__ */
2473
2474#include "ext4_extents.h"
2475
2476#endif /* _EXT4_H */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ext4.h
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/include/linux/minix_fs.h
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 */
16
17#ifndef _EXT4_H
18#define _EXT4_H
19
20#include <linux/refcount.h>
21#include <linux/types.h>
22#include <linux/blkdev.h>
23#include <linux/magic.h>
24#include <linux/jbd2.h>
25#include <linux/quota.h>
26#include <linux/rwsem.h>
27#include <linux/rbtree.h>
28#include <linux/seqlock.h>
29#include <linux/mutex.h>
30#include <linux/timer.h>
31#include <linux/wait.h>
32#include <linux/sched/signal.h>
33#include <linux/blockgroup_lock.h>
34#include <linux/percpu_counter.h>
35#include <linux/ratelimit.h>
36#include <crypto/hash.h>
37#include <linux/falloc.h>
38#include <linux/percpu-rwsem.h>
39#include <linux/fiemap.h>
40#ifdef __KERNEL__
41#include <linux/compat.h>
42#endif
43#include <uapi/linux/ext4.h>
44
45#include <linux/fscrypt.h>
46#include <linux/fsverity.h>
47
48#include <linux/compiler.h>
49
50/*
51 * The fourth extended filesystem constants/structures
52 */
53
54/*
55 * with AGGRESSIVE_CHECK allocator runs consistency checks over
56 * structures. these checks slow things down a lot
57 */
58#define AGGRESSIVE_CHECK__
59
60/*
61 * with DOUBLE_CHECK defined mballoc creates persistent in-core
62 * bitmaps, maintains and uses them to check for double allocations
63 */
64#define DOUBLE_CHECK__
65
66/*
67 * Define EXT4FS_DEBUG to produce debug messages
68 */
69#undef EXT4FS_DEBUG
70
71/*
72 * Debug code
73 */
74#ifdef EXT4FS_DEBUG
75#define ext4_debug(f, a...) \
76 do { \
77 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
78 __FILE__, __LINE__, __func__); \
79 printk(KERN_DEBUG f, ## a); \
80 } while (0)
81#else
82#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
83#endif
84
85 /*
86 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
87 */
88#define EXT_DEBUG__
89
90/*
91 * Dynamic printk for controlled extents debugging.
92 */
93#ifdef CONFIG_EXT4_DEBUG
94#define ext_debug(ino, fmt, ...) \
95 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
96 current->comm, task_pid_nr(current), \
97 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
98 __func__, ##__VA_ARGS__)
99#else
100#define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
101#endif
102
103#define ASSERT(assert) \
104do { \
105 if (unlikely(!(assert))) { \
106 printk(KERN_EMERG \
107 "Assertion failure in %s() at %s:%d: '%s'\n", \
108 __func__, __FILE__, __LINE__, #assert); \
109 BUG(); \
110 } \
111} while (0)
112
113/* data type for block offset of block group */
114typedef int ext4_grpblk_t;
115
116/* data type for filesystem-wide blocks number */
117typedef unsigned long long ext4_fsblk_t;
118
119/* data type for file logical block number */
120typedef __u32 ext4_lblk_t;
121
122/* data type for block group number */
123typedef unsigned int ext4_group_t;
124
125enum SHIFT_DIRECTION {
126 SHIFT_LEFT = 0,
127 SHIFT_RIGHT,
128};
129
130/*
131 * For each criteria, mballoc has slightly different way of finding
132 * the required blocks nad usually, higher the criteria the slower the
133 * allocation. We start at lower criterias and keep falling back to
134 * higher ones if we are not able to find any blocks. Lower (earlier)
135 * criteria are faster.
136 */
137enum criteria {
138 /*
139 * Used when number of blocks needed is a power of 2. This
140 * doesn't trigger any disk IO except prefetch and is the
141 * fastest criteria.
142 */
143 CR_POWER2_ALIGNED,
144
145 /*
146 * Tries to lookup in-memory data structures to find the most
147 * suitable group that satisfies goal request. No disk IO
148 * except block prefetch.
149 */
150 CR_GOAL_LEN_FAST,
151
152 /*
153 * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal
154 * length to the best available length for faster allocation.
155 */
156 CR_BEST_AVAIL_LEN,
157
158 /*
159 * Reads each block group sequentially, performing disk IO if
160 * necessary, to find find_suitable block group. Tries to
161 * allocate goal length but might trim the request if nothing
162 * is found after enough tries.
163 */
164 CR_GOAL_LEN_SLOW,
165
166 /*
167 * Finds the first free set of blocks and allocates
168 * those. This is only used in rare cases when
169 * CR_GOAL_LEN_SLOW also fails to allocate anything.
170 */
171 CR_ANY_FREE,
172
173 /*
174 * Number of criterias defined.
175 */
176 EXT4_MB_NUM_CRS
177};
178
179/*
180 * Flags used in mballoc's allocation_context flags field.
181 *
182 * Also used to show what's going on for debugging purposes when the
183 * flag field is exported via the traceport interface
184 */
185
186/* prefer goal again. length */
187#define EXT4_MB_HINT_MERGE 0x0001
188/* blocks already reserved */
189#define EXT4_MB_HINT_RESERVED 0x0002
190/* metadata is being allocated */
191#define EXT4_MB_HINT_METADATA 0x0004
192/* first blocks in the file */
193#define EXT4_MB_HINT_FIRST 0x0008
194/* search for the best chunk */
195#define EXT4_MB_HINT_BEST 0x0010
196/* data is being allocated */
197#define EXT4_MB_HINT_DATA 0x0020
198/* don't preallocate (for tails) */
199#define EXT4_MB_HINT_NOPREALLOC 0x0040
200/* allocate for locality group */
201#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
202/* allocate goal blocks or none */
203#define EXT4_MB_HINT_GOAL_ONLY 0x0100
204/* goal is meaningful */
205#define EXT4_MB_HINT_TRY_GOAL 0x0200
206/* blocks already pre-reserved by delayed allocation */
207#define EXT4_MB_DELALLOC_RESERVED 0x0400
208/* We are doing stream allocation */
209#define EXT4_MB_STREAM_ALLOC 0x0800
210/* Use reserved root blocks if needed */
211#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
212/* Use blocks from reserved pool */
213#define EXT4_MB_USE_RESERVED 0x2000
214/* Do strict check for free blocks while retrying block allocation */
215#define EXT4_MB_STRICT_CHECK 0x4000
216/* Large fragment size list lookup succeeded at least once for
217 * CR_POWER2_ALIGNED */
218#define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED 0x8000
219/* Avg fragment size rb tree lookup succeeded at least once for
220 * CR_GOAL_LEN_FAST */
221#define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED 0x00010000
222/* Avg fragment size rb tree lookup succeeded at least once for
223 * CR_BEST_AVAIL_LEN */
224#define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED 0x00020000
225
226struct ext4_allocation_request {
227 /* target inode for block we're allocating */
228 struct inode *inode;
229 /* how many blocks we want to allocate */
230 unsigned int len;
231 /* logical block in target inode */
232 ext4_lblk_t logical;
233 /* the closest logical allocated block to the left */
234 ext4_lblk_t lleft;
235 /* the closest logical allocated block to the right */
236 ext4_lblk_t lright;
237 /* phys. target (a hint) */
238 ext4_fsblk_t goal;
239 /* phys. block for the closest logical allocated block to the left */
240 ext4_fsblk_t pleft;
241 /* phys. block for the closest logical allocated block to the right */
242 ext4_fsblk_t pright;
243 /* flags. see above EXT4_MB_HINT_* */
244 unsigned int flags;
245};
246
247/*
248 * Logical to physical block mapping, used by ext4_map_blocks()
249 *
250 * This structure is used to pass requests into ext4_map_blocks() as
251 * well as to store the information returned by ext4_map_blocks(). It
252 * takes less room on the stack than a struct buffer_head.
253 */
254#define EXT4_MAP_NEW BIT(BH_New)
255#define EXT4_MAP_MAPPED BIT(BH_Mapped)
256#define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
257#define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
258#define EXT4_MAP_DELAYED BIT(BH_Delay)
259#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
260 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
261 EXT4_MAP_DELAYED)
262
263struct ext4_map_blocks {
264 ext4_fsblk_t m_pblk;
265 ext4_lblk_t m_lblk;
266 unsigned int m_len;
267 unsigned int m_flags;
268};
269
270/*
271 * Block validity checking, system zone rbtree.
272 */
273struct ext4_system_blocks {
274 struct rb_root root;
275 struct rcu_head rcu;
276};
277
278/*
279 * Flags for ext4_io_end->flags
280 */
281#define EXT4_IO_END_UNWRITTEN 0x0001
282
283struct ext4_io_end_vec {
284 struct list_head list; /* list of io_end_vec */
285 loff_t offset; /* offset in the file */
286 ssize_t size; /* size of the extent */
287};
288
289/*
290 * For converting unwritten extents on a work queue. 'handle' is used for
291 * buffered writeback.
292 */
293typedef struct ext4_io_end {
294 struct list_head list; /* per-file finished IO list */
295 handle_t *handle; /* handle reserved for extent
296 * conversion */
297 struct inode *inode; /* file being written to */
298 struct bio *bio; /* Linked list of completed
299 * bios covering the extent */
300 unsigned int flag; /* unwritten or not */
301 refcount_t count; /* reference counter */
302 struct list_head list_vec; /* list of ext4_io_end_vec */
303} ext4_io_end_t;
304
305struct ext4_io_submit {
306 struct writeback_control *io_wbc;
307 struct bio *io_bio;
308 ext4_io_end_t *io_end;
309 sector_t io_next_block;
310};
311
312/*
313 * Special inodes numbers
314 */
315#define EXT4_BAD_INO 1 /* Bad blocks inode */
316#define EXT4_ROOT_INO 2 /* Root inode */
317#define EXT4_USR_QUOTA_INO 3 /* User quota inode */
318#define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
319#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
320#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
321#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
322#define EXT4_JOURNAL_INO 8 /* Journal inode */
323
324/* First non-reserved inode for old ext4 filesystems */
325#define EXT4_GOOD_OLD_FIRST_INO 11
326
327/*
328 * Maximal count of links to a file
329 */
330#define EXT4_LINK_MAX 65000
331
332/*
333 * Macro-instructions used to manage several block sizes
334 */
335#define EXT4_MIN_BLOCK_SIZE 1024
336#define EXT4_MAX_BLOCK_SIZE 65536
337#define EXT4_MIN_BLOCK_LOG_SIZE 10
338#define EXT4_MAX_BLOCK_LOG_SIZE 16
339#define EXT4_MAX_CLUSTER_LOG_SIZE 30
340#ifdef __KERNEL__
341# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
342#else
343# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
344#endif
345#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
346#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
347 EXT4_SB(s)->s_cluster_bits)
348#ifdef __KERNEL__
349# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
350# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
351#else
352# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
353#endif
354#ifdef __KERNEL__
355#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
356#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
357#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
358#else
359#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
360 EXT4_GOOD_OLD_INODE_SIZE : \
361 (s)->s_inode_size)
362#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
363 EXT4_GOOD_OLD_FIRST_INO : \
364 (s)->s_first_ino)
365#endif
366#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
367#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
368 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
369 blkbits))
370
371/* Translate a block number to a cluster number */
372#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
373/* Translate a cluster number to a block number */
374#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
375/* Translate # of blks to # of clusters */
376#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
377 (sbi)->s_cluster_bits)
378/* Mask out the low bits to get the starting block of the cluster */
379#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
380 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
381#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
382 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
383/* Fill in the low bits to get the last block of the cluster */
384#define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
385 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
386/* Get the cluster offset */
387#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
388 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
389#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
390 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
391
392/*
393 * Structure of a blocks group descriptor
394 */
395struct ext4_group_desc
396{
397 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
398 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
399 __le32 bg_inode_table_lo; /* Inodes table block */
400 __le16 bg_free_blocks_count_lo;/* Free blocks count */
401 __le16 bg_free_inodes_count_lo;/* Free inodes count */
402 __le16 bg_used_dirs_count_lo; /* Directories count */
403 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
404 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
405 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
406 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
407 __le16 bg_itable_unused_lo; /* Unused inodes count */
408 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
409 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
410 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
411 __le32 bg_inode_table_hi; /* Inodes table block MSB */
412 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
413 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
414 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
415 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
416 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
417 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
418 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
419 __u32 bg_reserved;
420};
421
422#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
423 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
424 sizeof(__le16))
425#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
426 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
427 sizeof(__le16))
428
429/*
430 * Structure of a flex block group info
431 */
432
433struct flex_groups {
434 atomic64_t free_clusters;
435 atomic_t free_inodes;
436 atomic_t used_dirs;
437};
438
439#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
440#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
441#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
442
443/*
444 * Macro-instructions used to manage group descriptors
445 */
446#define EXT4_MIN_DESC_SIZE 32
447#define EXT4_MIN_DESC_SIZE_64BIT 64
448#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
449#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
450#ifdef __KERNEL__
451# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
452# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
453# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
454# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
455# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
456#else
457# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
458# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
459# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
460#endif
461
462/*
463 * Constants relative to the data blocks
464 */
465#define EXT4_NDIR_BLOCKS 12
466#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
467#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
468#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
469#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
470
471/*
472 * Inode flags
473 */
474#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
475#define EXT4_UNRM_FL 0x00000002 /* Undelete */
476#define EXT4_COMPR_FL 0x00000004 /* Compress file */
477#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
478#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
479#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
480#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
481#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
482/* Reserved for compression usage... */
483#define EXT4_DIRTY_FL 0x00000100
484#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
485#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
486 /* nb: was previously EXT2_ECOMPR_FL */
487#define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
488/* End compression flags --- maybe not all used */
489#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
490#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
491#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
492#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
493#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
494#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
495#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
496#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
497#define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
498#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
499/* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
500
501#define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
502
503#define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
504#define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
505#define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
506#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
507
508/* User modifiable flags */
509#define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
510 EXT4_UNRM_FL | \
511 EXT4_COMPR_FL | \
512 EXT4_SYNC_FL | \
513 EXT4_IMMUTABLE_FL | \
514 EXT4_APPEND_FL | \
515 EXT4_NODUMP_FL | \
516 EXT4_NOATIME_FL | \
517 EXT4_JOURNAL_DATA_FL | \
518 EXT4_NOTAIL_FL | \
519 EXT4_DIRSYNC_FL | \
520 EXT4_TOPDIR_FL | \
521 EXT4_EXTENTS_FL | \
522 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
523 EXT4_DAX_FL | \
524 EXT4_PROJINHERIT_FL | \
525 EXT4_CASEFOLD_FL)
526
527/* User visible flags */
528#define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
529 EXT4_DIRTY_FL | \
530 EXT4_COMPRBLK_FL | \
531 EXT4_NOCOMPR_FL | \
532 EXT4_ENCRYPT_FL | \
533 EXT4_INDEX_FL | \
534 EXT4_VERITY_FL | \
535 EXT4_INLINE_DATA_FL)
536
537/* Flags that should be inherited by new inodes from their parent. */
538#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
539 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
540 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
541 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
542 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
543 EXT4_DAX_FL)
544
545/* Flags that are appropriate for regular files (all but dir-specific ones). */
546#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
547 EXT4_PROJINHERIT_FL))
548
549/* Flags that are appropriate for non-directories/regular files. */
550#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
551
552/* The only flags that should be swapped */
553#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
554
555/* Flags which are mutually exclusive to DAX */
556#define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
557 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
558
559/* Mask out flags that are inappropriate for the given type of inode. */
560static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
561{
562 if (S_ISDIR(mode))
563 return flags;
564 else if (S_ISREG(mode))
565 return flags & EXT4_REG_FLMASK;
566 else
567 return flags & EXT4_OTHER_FLMASK;
568}
569
570/*
571 * Inode flags used for atomic set/get
572 */
573enum {
574 EXT4_INODE_SECRM = 0, /* Secure deletion */
575 EXT4_INODE_UNRM = 1, /* Undelete */
576 EXT4_INODE_COMPR = 2, /* Compress file */
577 EXT4_INODE_SYNC = 3, /* Synchronous updates */
578 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
579 EXT4_INODE_APPEND = 5, /* writes to file may only append */
580 EXT4_INODE_NODUMP = 6, /* do not dump file */
581 EXT4_INODE_NOATIME = 7, /* do not update atime */
582/* Reserved for compression usage... */
583 EXT4_INODE_DIRTY = 8,
584 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
585 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
586 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
587/* End compression flags --- maybe not all used */
588 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
589 EXT4_INODE_IMAGIC = 13, /* AFS directory */
590 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
591 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
592 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
593 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
594 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
595 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
596 EXT4_INODE_VERITY = 20, /* Verity protected inode */
597 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
598/* 22 was formerly EXT4_INODE_EOFBLOCKS */
599 EXT4_INODE_DAX = 25, /* Inode is DAX */
600 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
601 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
602 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
603 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
604};
605
606/*
607 * Since it's pretty easy to mix up bit numbers and hex values, we use a
608 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
609 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
610 * any extra space in the compiled kernel image, otherwise, the build will fail.
611 * It's important that these values are the same, since we are using
612 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
613 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
614 * values found in ext2, ext3 and ext4 filesystems, and of course the values
615 * defined in e2fsprogs.
616 *
617 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
618 */
619#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
620#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
621
622static inline void ext4_check_flag_values(void)
623{
624 CHECK_FLAG_VALUE(SECRM);
625 CHECK_FLAG_VALUE(UNRM);
626 CHECK_FLAG_VALUE(COMPR);
627 CHECK_FLAG_VALUE(SYNC);
628 CHECK_FLAG_VALUE(IMMUTABLE);
629 CHECK_FLAG_VALUE(APPEND);
630 CHECK_FLAG_VALUE(NODUMP);
631 CHECK_FLAG_VALUE(NOATIME);
632 CHECK_FLAG_VALUE(DIRTY);
633 CHECK_FLAG_VALUE(COMPRBLK);
634 CHECK_FLAG_VALUE(NOCOMPR);
635 CHECK_FLAG_VALUE(ENCRYPT);
636 CHECK_FLAG_VALUE(INDEX);
637 CHECK_FLAG_VALUE(IMAGIC);
638 CHECK_FLAG_VALUE(JOURNAL_DATA);
639 CHECK_FLAG_VALUE(NOTAIL);
640 CHECK_FLAG_VALUE(DIRSYNC);
641 CHECK_FLAG_VALUE(TOPDIR);
642 CHECK_FLAG_VALUE(HUGE_FILE);
643 CHECK_FLAG_VALUE(EXTENTS);
644 CHECK_FLAG_VALUE(VERITY);
645 CHECK_FLAG_VALUE(EA_INODE);
646 CHECK_FLAG_VALUE(INLINE_DATA);
647 CHECK_FLAG_VALUE(PROJINHERIT);
648 CHECK_FLAG_VALUE(CASEFOLD);
649 CHECK_FLAG_VALUE(RESERVED);
650}
651
652#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
653struct compat_ext4_new_group_input {
654 u32 group;
655 compat_u64 block_bitmap;
656 compat_u64 inode_bitmap;
657 compat_u64 inode_table;
658 u32 blocks_count;
659 u16 reserved_blocks;
660 u16 unused;
661};
662#endif
663
664/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
665struct ext4_new_group_data {
666 __u32 group;
667 __u64 block_bitmap;
668 __u64 inode_bitmap;
669 __u64 inode_table;
670 __u32 blocks_count;
671 __u16 reserved_blocks;
672 __u16 mdata_blocks;
673 __u32 free_clusters_count;
674};
675
676/* Indexes used to index group tables in ext4_new_group_data */
677enum {
678 BLOCK_BITMAP = 0, /* block bitmap */
679 INODE_BITMAP, /* inode bitmap */
680 INODE_TABLE, /* inode tables */
681 GROUP_TABLE_COUNT,
682};
683
684/*
685 * Flags used by ext4_map_blocks()
686 */
687 /* Allocate any needed blocks and/or convert an unwritten
688 extent to be an initialized ext4 */
689#define EXT4_GET_BLOCKS_CREATE 0x0001
690 /* Request the creation of an unwritten extent */
691#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
692#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
693 EXT4_GET_BLOCKS_CREATE)
694 /* Caller is from the delayed allocation writeout path
695 * finally doing the actual allocation of delayed blocks */
696#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
697 /* caller is from the direct IO path, request to creation of an
698 unwritten extents if not allocated, split the unwritten
699 extent if blocks has been preallocated already*/
700#define EXT4_GET_BLOCKS_PRE_IO 0x0008
701#define EXT4_GET_BLOCKS_CONVERT 0x0010
702#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
703 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
704 /* Convert extent to initialized after IO complete */
705#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
706 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
707 /* Eventual metadata allocation (due to growing extent tree)
708 * should not fail, so try to use reserved blocks for that.*/
709#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
710 /* Don't normalize allocation size (used for fallocate) */
711#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
712 /* Convert written extents to unwritten */
713#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
714 /* Write zeros to newly created written extents */
715#define EXT4_GET_BLOCKS_ZERO 0x0200
716#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
717 EXT4_GET_BLOCKS_ZERO)
718 /* Caller will submit data before dropping transaction handle. This
719 * allows jbd2 to avoid submitting data before commit. */
720#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
721 /* Caller is in the atomic contex, find extent if it has been cached */
722#define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
723
724/*
725 * The bit position of these flags must not overlap with any of the
726 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
727 * read_extent_tree_block(), ext4_split_extent_at(),
728 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
729 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
730 * caching the extents when reading from the extent tree while a
731 * truncate or punch hole operation is in progress.
732 */
733#define EXT4_EX_NOCACHE 0x40000000
734#define EXT4_EX_FORCE_CACHE 0x20000000
735#define EXT4_EX_NOFAIL 0x10000000
736
737/*
738 * Flags used by ext4_free_blocks
739 */
740#define EXT4_FREE_BLOCKS_METADATA 0x0001
741#define EXT4_FREE_BLOCKS_FORGET 0x0002
742#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
743#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
744#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
745#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
746#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
747
748#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
749/*
750 * ioctl commands in 32 bit emulation
751 */
752#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
753#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
754#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
755#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
756#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
757#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
758#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
759#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
760#endif
761
762/* Max physical block we can address w/o extents */
763#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
764
765/* Max logical block we can support */
766#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
767
768/*
769 * Structure of an inode on the disk
770 */
771struct ext4_inode {
772 __le16 i_mode; /* File mode */
773 __le16 i_uid; /* Low 16 bits of Owner Uid */
774 __le32 i_size_lo; /* Size in bytes */
775 __le32 i_atime; /* Access time */
776 __le32 i_ctime; /* Inode Change time */
777 __le32 i_mtime; /* Modification time */
778 __le32 i_dtime; /* Deletion Time */
779 __le16 i_gid; /* Low 16 bits of Group Id */
780 __le16 i_links_count; /* Links count */
781 __le32 i_blocks_lo; /* Blocks count */
782 __le32 i_flags; /* File flags */
783 union {
784 struct {
785 __le32 l_i_version;
786 } linux1;
787 struct {
788 __u32 h_i_translator;
789 } hurd1;
790 struct {
791 __u32 m_i_reserved1;
792 } masix1;
793 } osd1; /* OS dependent 1 */
794 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
795 __le32 i_generation; /* File version (for NFS) */
796 __le32 i_file_acl_lo; /* File ACL */
797 __le32 i_size_high;
798 __le32 i_obso_faddr; /* Obsoleted fragment address */
799 union {
800 struct {
801 __le16 l_i_blocks_high; /* were l_i_reserved1 */
802 __le16 l_i_file_acl_high;
803 __le16 l_i_uid_high; /* these 2 fields */
804 __le16 l_i_gid_high; /* were reserved2[0] */
805 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
806 __le16 l_i_reserved;
807 } linux2;
808 struct {
809 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
810 __u16 h_i_mode_high;
811 __u16 h_i_uid_high;
812 __u16 h_i_gid_high;
813 __u32 h_i_author;
814 } hurd2;
815 struct {
816 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
817 __le16 m_i_file_acl_high;
818 __u32 m_i_reserved2[2];
819 } masix2;
820 } osd2; /* OS dependent 2 */
821 __le16 i_extra_isize;
822 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
823 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
824 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
825 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
826 __le32 i_crtime; /* File Creation time */
827 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
828 __le32 i_version_hi; /* high 32 bits for 64-bit version */
829 __le32 i_projid; /* Project ID */
830};
831
832#define EXT4_EPOCH_BITS 2
833#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
834#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
835
836/*
837 * Extended fields will fit into an inode if the filesystem was formatted
838 * with large inodes (-I 256 or larger) and there are not currently any EAs
839 * consuming all of the available space. For new inodes we always reserve
840 * enough space for the kernel's known extended fields, but for inodes
841 * created with an old kernel this might not have been the case. None of
842 * the extended inode fields is critical for correct filesystem operation.
843 * This macro checks if a certain field fits in the inode. Note that
844 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
845 */
846#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
847 ((offsetof(typeof(*ext4_inode), field) + \
848 sizeof((ext4_inode)->field)) \
849 <= (EXT4_GOOD_OLD_INODE_SIZE + \
850 (einode)->i_extra_isize)) \
851
852/*
853 * We use an encoding that preserves the times for extra epoch "00":
854 *
855 * extra msb of adjust for signed
856 * epoch 32-bit 32-bit tv_sec to
857 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
858 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
859 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
860 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
861 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
862 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
863 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
864 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
865 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
866 *
867 * Note that previous versions of the kernel on 64-bit systems would
868 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
869 * 1970. e2fsck will correct this, assuming that it is run on the
870 * affected filesystem before 2242.
871 */
872
873static inline __le32 ext4_encode_extra_time(struct timespec64 ts)
874{
875 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK;
876 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS));
877}
878
879static inline struct timespec64 ext4_decode_extra_time(__le32 base,
880 __le32 extra)
881{
882 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) };
883
884 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
885 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
886 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
887 return ts;
888}
889
890#define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \
891do { \
892 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
893 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \
894 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \
895 } else \
896 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \
897} while (0)
898
899#define EXT4_INODE_SET_ATIME(inode, raw_inode) \
900 EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode))
901
902#define EXT4_INODE_SET_MTIME(inode, raw_inode) \
903 EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode))
904
905#define EXT4_INODE_SET_CTIME(inode, raw_inode) \
906 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode))
907
908#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
909 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
910 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \
911 raw_inode, (einode)->xtime)
912
913#define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \
914 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \
915 ext4_decode_extra_time((raw_inode)->xtime, \
916 (raw_inode)->xtime ## _extra) : \
917 (struct timespec64) { \
918 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \
919 })
920
921#define EXT4_INODE_GET_ATIME(inode, raw_inode) \
922do { \
923 inode_set_atime_to_ts(inode, \
924 EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \
925} while (0)
926
927#define EXT4_INODE_GET_MTIME(inode, raw_inode) \
928do { \
929 inode_set_mtime_to_ts(inode, \
930 EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \
931} while (0)
932
933#define EXT4_INODE_GET_CTIME(inode, raw_inode) \
934do { \
935 inode_set_ctime_to_ts(inode, \
936 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \
937} while (0)
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 = \
943 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \
944 raw_inode); \
945 else \
946 (einode)->xtime = (struct timespec64){0, 0}; \
947} while (0)
948
949#define i_disk_version osd1.linux1.l_i_version
950
951#if defined(__KERNEL__) || defined(__linux__)
952#define i_reserved1 osd1.linux1.l_i_reserved1
953#define i_file_acl_high osd2.linux2.l_i_file_acl_high
954#define i_blocks_high osd2.linux2.l_i_blocks_high
955#define i_uid_low i_uid
956#define i_gid_low i_gid
957#define i_uid_high osd2.linux2.l_i_uid_high
958#define i_gid_high osd2.linux2.l_i_gid_high
959#define i_checksum_lo osd2.linux2.l_i_checksum_lo
960
961#elif defined(__GNU__)
962
963#define i_translator osd1.hurd1.h_i_translator
964#define i_uid_high osd2.hurd2.h_i_uid_high
965#define i_gid_high osd2.hurd2.h_i_gid_high
966#define i_author osd2.hurd2.h_i_author
967
968#elif defined(__masix__)
969
970#define i_reserved1 osd1.masix1.m_i_reserved1
971#define i_file_acl_high osd2.masix2.m_i_file_acl_high
972#define i_reserved2 osd2.masix2.m_i_reserved2
973
974#endif /* defined(__KERNEL__) || defined(__linux__) */
975
976#include "extents_status.h"
977#include "fast_commit.h"
978
979/*
980 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
981 *
982 * These are needed to avoid lockdep false positives when we need to
983 * allocate blocks to the quota inode during ext4_map_blocks(), while
984 * holding i_data_sem for a normal (non-quota) inode. Since we don't
985 * do quota tracking for the quota inode, this avoids deadlock (as
986 * well as infinite recursion, since it isn't turtles all the way
987 * down...)
988 *
989 * I_DATA_SEM_NORMAL - Used for most inodes
990 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
991 * where the second inode has larger inode number
992 * than the first
993 * I_DATA_SEM_QUOTA - Used for quota inodes only
994 * I_DATA_SEM_EA - Used for ea_inodes only
995 */
996enum {
997 I_DATA_SEM_NORMAL = 0,
998 I_DATA_SEM_OTHER,
999 I_DATA_SEM_QUOTA,
1000 I_DATA_SEM_EA
1001};
1002
1003
1004/*
1005 * fourth extended file system inode data in memory
1006 */
1007struct ext4_inode_info {
1008 __le32 i_data[15]; /* unconverted */
1009 __u32 i_dtime;
1010 ext4_fsblk_t i_file_acl;
1011
1012 /*
1013 * i_block_group is the number of the block group which contains
1014 * this file's inode. Constant across the lifetime of the inode,
1015 * it is used for making block allocation decisions - we try to
1016 * place a file's data blocks near its inode block, and new inodes
1017 * near to their parent directory's inode.
1018 */
1019 ext4_group_t i_block_group;
1020 ext4_lblk_t i_dir_start_lookup;
1021#if (BITS_PER_LONG < 64)
1022 unsigned long i_state_flags; /* Dynamic state flags */
1023#endif
1024 unsigned long i_flags;
1025
1026 /*
1027 * Extended attributes can be read independently of the main file
1028 * data. Taking i_rwsem even when reading would cause contention
1029 * between readers of EAs and writers of regular file data, so
1030 * instead we synchronize on xattr_sem when reading or changing
1031 * EAs.
1032 */
1033 struct rw_semaphore xattr_sem;
1034
1035 /*
1036 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1037 * i_orphan is used.
1038 */
1039 union {
1040 struct list_head i_orphan; /* unlinked but open inodes */
1041 unsigned int i_orphan_idx; /* Index in orphan file */
1042 };
1043
1044 /* Fast commit related info */
1045
1046 /* For tracking dentry create updates */
1047 struct list_head i_fc_dilist;
1048 struct list_head i_fc_list; /*
1049 * inodes that need fast commit
1050 * protected by sbi->s_fc_lock.
1051 */
1052
1053 /* Start of lblk range that needs to be committed in this fast commit */
1054 ext4_lblk_t i_fc_lblk_start;
1055
1056 /* End of lblk range that needs to be committed in this fast commit */
1057 ext4_lblk_t i_fc_lblk_len;
1058
1059 /* Number of ongoing updates on this inode */
1060 atomic_t i_fc_updates;
1061 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1062
1063 /* Fast commit wait queue for this inode */
1064 wait_queue_head_t i_fc_wait;
1065
1066 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1067 struct mutex i_fc_lock;
1068
1069 /*
1070 * i_disksize keeps track of what the inode size is ON DISK, not
1071 * in memory. During truncate, i_size is set to the new size by
1072 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1073 * set i_disksize to 0 until the truncate is actually under way.
1074 *
1075 * The intent is that i_disksize always represents the blocks which
1076 * are used by this file. This allows recovery to restart truncate
1077 * on orphans if we crash during truncate. We actually write i_disksize
1078 * into the on-disk inode when writing inodes out, instead of i_size.
1079 *
1080 * The only time when i_disksize and i_size may be different is when
1081 * a truncate is in progress. The only things which change i_disksize
1082 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1083 */
1084 loff_t i_disksize;
1085
1086 /*
1087 * i_data_sem is for serialising ext4_truncate() against
1088 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1089 * data tree are chopped off during truncate. We can't do that in
1090 * ext4 because whenever we perform intermediate commits during
1091 * truncate, the inode and all the metadata blocks *must* be in a
1092 * consistent state which allows truncation of the orphans to restart
1093 * during recovery. Hence we must fix the get_block-vs-truncate race
1094 * by other means, so we have i_data_sem.
1095 */
1096 struct rw_semaphore i_data_sem;
1097 struct inode vfs_inode;
1098 struct jbd2_inode *jinode;
1099
1100 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1101
1102 /*
1103 * File creation time. Its function is same as that of
1104 * struct timespec64 i_{a,c,m}time in the generic inode.
1105 */
1106 struct timespec64 i_crtime;
1107
1108 /* mballoc */
1109 atomic_t i_prealloc_active;
1110
1111 /* allocation reservation info for delalloc */
1112 /* In case of bigalloc, this refer to clusters rather than blocks */
1113 unsigned int i_reserved_data_blocks;
1114 struct rb_root i_prealloc_node;
1115 rwlock_t i_prealloc_lock;
1116
1117 /* extents status tree */
1118 struct ext4_es_tree i_es_tree;
1119 rwlock_t i_es_lock;
1120 struct list_head i_es_list;
1121 unsigned int i_es_all_nr; /* protected by i_es_lock */
1122 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1123 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1124 extents to shrink. Protected by
1125 i_es_lock */
1126
1127 /* ialloc */
1128 ext4_group_t i_last_alloc_group;
1129
1130 /* pending cluster reservations for bigalloc file systems */
1131 struct ext4_pending_tree i_pending_tree;
1132
1133 /* on-disk additional length */
1134 __u16 i_extra_isize;
1135
1136 /* Indicate the inline data space. */
1137 u16 i_inline_off;
1138 u16 i_inline_size;
1139
1140#ifdef CONFIG_QUOTA
1141 /* quota space reservation, managed internally by quota code */
1142 qsize_t i_reserved_quota;
1143#endif
1144
1145 /* Lock protecting lists below */
1146 spinlock_t i_completed_io_lock;
1147 /*
1148 * Completed IOs that need unwritten extents handling and have
1149 * transaction reserved
1150 */
1151 struct list_head i_rsv_conversion_list;
1152 struct work_struct i_rsv_conversion_work;
1153
1154 spinlock_t i_block_reservation_lock;
1155
1156 /*
1157 * Transactions that contain inode's metadata needed to complete
1158 * fsync and fdatasync, respectively.
1159 */
1160 tid_t i_sync_tid;
1161 tid_t i_datasync_tid;
1162
1163#ifdef CONFIG_QUOTA
1164 struct dquot __rcu *i_dquot[MAXQUOTAS];
1165#endif
1166
1167 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1168 __u32 i_csum_seed;
1169
1170 kprojid_t i_projid;
1171};
1172
1173/*
1174 * File system states
1175 */
1176#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1177#define EXT4_ERROR_FS 0x0002 /* Errors detected */
1178#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1179#define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1180
1181/*
1182 * Misc. filesystem flags
1183 */
1184#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1185#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1186#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1187
1188/*
1189 * Mount flags set via mount options or defaults
1190 */
1191#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1192#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1193#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1194#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1195#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1196#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1197#define EXT4_MOUNT_ERRORS_MASK 0x00070
1198#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1199#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1200#ifdef CONFIG_FS_DAX
1201#define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1202#else
1203#define EXT4_MOUNT_DAX_ALWAYS 0
1204#endif
1205#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1206#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1207#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1208#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1209#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1210#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1211#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1212#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1213#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1214#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1215#define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1216#define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1217 * enable enforcement for hidden
1218 * quota files */
1219#define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1220 * enforcement for hidden quota
1221 * files */
1222#define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1223 * enforcement */
1224#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1225#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1226#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1227#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1228#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1229#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1230#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1231#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1232#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1233#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1234
1235/*
1236 * Mount flags set either automatically (could not be set by mount option)
1237 * based on per file system feature or property or in special cases such as
1238 * distinguishing between explicit mount option definition and default.
1239 */
1240#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1241 specified delalloc */
1242#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1243 size of blocksize * 8
1244 blocks */
1245#define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1246 file systems */
1247#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1248 specified journal checksum */
1249
1250#define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1251#define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1252#define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1253#define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1254 * scanning in mballoc
1255 */
1256#define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */
1257
1258#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1259 ~EXT4_MOUNT_##opt
1260#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1261 EXT4_MOUNT_##opt
1262#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1263 EXT4_MOUNT_##opt)
1264
1265#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1266 ~EXT4_MOUNT2_##opt
1267#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1268 EXT4_MOUNT2_##opt
1269#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1270 EXT4_MOUNT2_##opt)
1271
1272#define ext4_test_and_set_bit __test_and_set_bit_le
1273#define ext4_set_bit __set_bit_le
1274#define ext4_test_and_clear_bit __test_and_clear_bit_le
1275#define ext4_clear_bit __clear_bit_le
1276#define ext4_test_bit test_bit_le
1277#define ext4_find_next_zero_bit find_next_zero_bit_le
1278#define ext4_find_next_bit find_next_bit_le
1279
1280extern void mb_set_bits(void *bm, int cur, int len);
1281
1282/*
1283 * Maximal mount counts between two filesystem checks
1284 */
1285#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1286#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1287
1288/*
1289 * Behaviour when detecting errors
1290 */
1291#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1292#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1293#define EXT4_ERRORS_PANIC 3 /* Panic */
1294#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1295
1296/* Metadata checksum algorithm codes */
1297#define EXT4_CRC32C_CHKSUM 1
1298
1299#define EXT4_LABEL_MAX 16
1300
1301/*
1302 * Structure of the super block
1303 */
1304struct ext4_super_block {
1305/*00*/ __le32 s_inodes_count; /* Inodes count */
1306 __le32 s_blocks_count_lo; /* Blocks count */
1307 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1308 __le32 s_free_blocks_count_lo; /* Free blocks count */
1309/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1310 __le32 s_first_data_block; /* First Data Block */
1311 __le32 s_log_block_size; /* Block size */
1312 __le32 s_log_cluster_size; /* Allocation cluster size */
1313/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1314 __le32 s_clusters_per_group; /* # Clusters per group */
1315 __le32 s_inodes_per_group; /* # Inodes per group */
1316 __le32 s_mtime; /* Mount time */
1317/*30*/ __le32 s_wtime; /* Write time */
1318 __le16 s_mnt_count; /* Mount count */
1319 __le16 s_max_mnt_count; /* Maximal mount count */
1320 __le16 s_magic; /* Magic signature */
1321 __le16 s_state; /* File system state */
1322 __le16 s_errors; /* Behaviour when detecting errors */
1323 __le16 s_minor_rev_level; /* minor revision level */
1324/*40*/ __le32 s_lastcheck; /* time of last check */
1325 __le32 s_checkinterval; /* max. time between checks */
1326 __le32 s_creator_os; /* OS */
1327 __le32 s_rev_level; /* Revision level */
1328/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1329 __le16 s_def_resgid; /* Default gid for reserved blocks */
1330 /*
1331 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1332 *
1333 * Note: the difference between the compatible feature set and
1334 * the incompatible feature set is that if there is a bit set
1335 * in the incompatible feature set that the kernel doesn't
1336 * know about, it should refuse to mount the filesystem.
1337 *
1338 * e2fsck's requirements are more strict; if it doesn't know
1339 * about a feature in either the compatible or incompatible
1340 * feature set, it must abort and not try to meddle with
1341 * things it doesn't understand...
1342 */
1343 __le32 s_first_ino; /* First non-reserved inode */
1344 __le16 s_inode_size; /* size of inode structure */
1345 __le16 s_block_group_nr; /* block group # of this superblock */
1346 __le32 s_feature_compat; /* compatible feature set */
1347/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1348 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1349/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1350/*78*/ char s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */
1351/*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1352/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1353 /*
1354 * Performance hints. Directory preallocation should only
1355 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1356 */
1357 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1358 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1359 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1360 /*
1361 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1362 */
1363/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1364/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1365 __le32 s_journal_dev; /* device number of journal file */
1366 __le32 s_last_orphan; /* start of list of inodes to delete */
1367 __le32 s_hash_seed[4]; /* HTREE hash seed */
1368 __u8 s_def_hash_version; /* Default hash version to use */
1369 __u8 s_jnl_backup_type;
1370 __le16 s_desc_size; /* size of group descriptor */
1371/*100*/ __le32 s_default_mount_opts;
1372 __le32 s_first_meta_bg; /* First metablock block group */
1373 __le32 s_mkfs_time; /* When the filesystem was created */
1374 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1375 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */
1376/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1377 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1378 __le32 s_free_blocks_count_hi; /* Free blocks count */
1379 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1380 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1381 __le32 s_flags; /* Miscellaneous flags */
1382 __le16 s_raid_stride; /* RAID stride */
1383 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1384 __le64 s_mmp_block; /* Block for multi-mount protection */
1385 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1386 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1387 __u8 s_checksum_type; /* metadata checksum algorithm used */
1388 __u8 s_encryption_level; /* versioning level for encryption */
1389 __u8 s_reserved_pad; /* Padding to next 32bits */
1390 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1391 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1392 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1393 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1394 snapshot's future use */
1395 __le32 s_snapshot_list; /* inode number of the head of the
1396 on-disk snapshot list */
1397#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1398 __le32 s_error_count; /* number of fs errors */
1399 __le32 s_first_error_time; /* first time an error happened */
1400 __le32 s_first_error_ino; /* inode involved in first error */
1401 __le64 s_first_error_block; /* block involved of first error */
1402 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1403 __le32 s_first_error_line; /* line number where error happened */
1404 __le32 s_last_error_time; /* most recent time of an error */
1405 __le32 s_last_error_ino; /* inode involved in last error */
1406 __le32 s_last_error_line; /* line number where error happened */
1407 __le64 s_last_error_block; /* block involved of last error */
1408 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1409#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1410 __u8 s_mount_opts[64];
1411 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1412 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1413 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1414 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1415 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1416 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1417 __le32 s_lpf_ino; /* Location of the lost+found inode */
1418 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1419 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1420 __u8 s_wtime_hi;
1421 __u8 s_mtime_hi;
1422 __u8 s_mkfs_time_hi;
1423 __u8 s_lastcheck_hi;
1424 __u8 s_first_error_time_hi;
1425 __u8 s_last_error_time_hi;
1426 __u8 s_first_error_errcode;
1427 __u8 s_last_error_errcode;
1428 __le16 s_encoding; /* Filename charset encoding */
1429 __le16 s_encoding_flags; /* Filename charset encoding flags */
1430 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
1431 __le32 s_reserved[94]; /* 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/* Number of quota types we support */
1440#define EXT4_MAXQUOTAS 3
1441
1442#define EXT4_ENC_UTF8_12_1 1
1443
1444/* Types of ext4 journal triggers */
1445enum ext4_journal_trigger_type {
1446 EXT4_JTR_ORPHAN_FILE,
1447 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
1448};
1449
1450#define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1451
1452struct ext4_journal_trigger {
1453 struct jbd2_buffer_trigger_type tr_triggers;
1454 struct super_block *sb;
1455};
1456
1457static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1458 struct jbd2_buffer_trigger_type *trigger)
1459{
1460 return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1461}
1462
1463#define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1464
1465/* Structure at the tail of orphan block */
1466struct ext4_orphan_block_tail {
1467 __le32 ob_magic;
1468 __le32 ob_checksum;
1469};
1470
1471static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1472{
1473 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1474 sizeof(u32);
1475}
1476
1477struct ext4_orphan_block {
1478 atomic_t ob_free_entries; /* Number of free orphan entries in block */
1479 struct buffer_head *ob_bh; /* Buffer for orphan block */
1480};
1481
1482/*
1483 * Info about orphan file.
1484 */
1485struct ext4_orphan_info {
1486 int of_blocks; /* Number of orphan blocks in a file */
1487 __u32 of_csum_seed; /* Checksum seed for orphan file */
1488 struct ext4_orphan_block *of_binfo; /* Array with info about orphan
1489 * file blocks */
1490};
1491
1492/*
1493 * fourth extended-fs super-block data in memory
1494 */
1495struct ext4_sb_info {
1496 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1497 unsigned long s_inodes_per_block;/* Number of inodes per block */
1498 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1499 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1500 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1501 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1502 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1503 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1504 ext4_group_t s_groups_count; /* Number of groups in the fs */
1505 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1506 unsigned long s_overhead; /* # of fs overhead clusters */
1507 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1508 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1509 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1510 struct buffer_head * s_sbh; /* Buffer containing the super block */
1511 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1512 /* Array of bh's for the block group descriptors */
1513 struct buffer_head * __rcu *s_group_desc;
1514 unsigned int s_mount_opt;
1515 unsigned int s_mount_opt2;
1516 unsigned long s_mount_flags;
1517 unsigned int s_def_mount_opt;
1518 unsigned int s_def_mount_opt2;
1519 ext4_fsblk_t s_sb_block;
1520 atomic64_t s_resv_clusters;
1521 kuid_t s_resuid;
1522 kgid_t s_resgid;
1523 unsigned short s_mount_state;
1524 unsigned short s_pad;
1525 int s_addr_per_block_bits;
1526 int s_desc_per_block_bits;
1527 int s_inode_size;
1528 int s_first_ino;
1529 unsigned int s_inode_readahead_blks;
1530 unsigned int s_inode_goal;
1531 u32 s_hash_seed[4];
1532 int s_def_hash_version;
1533 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1534 struct percpu_counter s_freeclusters_counter;
1535 struct percpu_counter s_freeinodes_counter;
1536 struct percpu_counter s_dirs_counter;
1537 struct percpu_counter s_dirtyclusters_counter;
1538 struct percpu_counter s_sra_exceeded_retry_limit;
1539 struct blockgroup_lock *s_blockgroup_lock;
1540 struct proc_dir_entry *s_proc;
1541 struct kobject s_kobj;
1542 struct completion s_kobj_unregister;
1543 struct super_block *s_sb;
1544 struct buffer_head *s_mmp_bh;
1545
1546 /* Journaling */
1547 struct journal_s *s_journal;
1548 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1549 struct mutex s_orphan_lock; /* Protects on disk list changes */
1550 struct list_head s_orphan; /* List of orphaned inodes in on disk
1551 list */
1552 struct ext4_orphan_info s_orphan_info;
1553 unsigned long s_commit_interval;
1554 u32 s_max_batch_time;
1555 u32 s_min_batch_time;
1556 struct file *s_journal_bdev_file;
1557#ifdef CONFIG_QUOTA
1558 /* Names of quota files with journalled quota */
1559 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1560 int s_jquota_fmt; /* Format of quota to use */
1561#endif
1562 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1563 struct ext4_system_blocks __rcu *s_system_blks;
1564
1565#ifdef EXTENTS_STATS
1566 /* ext4 extents stats */
1567 unsigned long s_ext_min;
1568 unsigned long s_ext_max;
1569 unsigned long s_depth_max;
1570 spinlock_t s_ext_stats_lock;
1571 unsigned long s_ext_blocks;
1572 unsigned long s_ext_extents;
1573#endif
1574
1575 /* for buddy allocator */
1576 struct ext4_group_info ** __rcu *s_group_info;
1577 struct inode *s_buddy_cache;
1578 spinlock_t s_md_lock;
1579 unsigned short *s_mb_offsets;
1580 unsigned int *s_mb_maxs;
1581 unsigned int s_group_info_size;
1582 unsigned int s_mb_free_pending;
1583 struct list_head s_freed_data_list[2]; /* List of blocks to be freed
1584 after commit completed */
1585 struct list_head s_discard_list;
1586 struct work_struct s_discard_work;
1587 atomic_t s_retry_alloc_pending;
1588 struct list_head *s_mb_avg_fragment_size;
1589 rwlock_t *s_mb_avg_fragment_size_locks;
1590 struct list_head *s_mb_largest_free_orders;
1591 rwlock_t *s_mb_largest_free_orders_locks;
1592
1593 /* tunables */
1594 unsigned long s_stripe;
1595 unsigned int s_mb_max_linear_groups;
1596 unsigned int s_mb_stream_request;
1597 unsigned int s_mb_max_to_scan;
1598 unsigned int s_mb_min_to_scan;
1599 unsigned int s_mb_stats;
1600 unsigned int s_mb_order2_reqs;
1601 unsigned int s_mb_group_prealloc;
1602 unsigned int s_max_dir_size_kb;
1603 /* where last allocation was done - for stream allocation */
1604 unsigned long s_mb_last_group;
1605 unsigned long s_mb_last_start;
1606 unsigned int s_mb_prefetch;
1607 unsigned int s_mb_prefetch_limit;
1608 unsigned int s_mb_best_avail_max_trim_order;
1609
1610 /* stats for buddy allocator */
1611 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1612 atomic_t s_bal_success; /* we found long enough chunks */
1613 atomic_t s_bal_allocated; /* in blocks */
1614 atomic_t s_bal_ex_scanned; /* total extents scanned */
1615 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */
1616 atomic_t s_bal_groups_scanned; /* number of groups scanned */
1617 atomic_t s_bal_goals; /* goal hits */
1618 atomic_t s_bal_len_goals; /* len goal hits */
1619 atomic_t s_bal_breaks; /* too long searches */
1620 atomic_t s_bal_2orders; /* 2^order hits */
1621 atomic_t s_bal_p2_aligned_bad_suggestions;
1622 atomic_t s_bal_goal_fast_bad_suggestions;
1623 atomic_t s_bal_best_avail_bad_suggestions;
1624 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
1625 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
1626 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */
1627 atomic_t s_mb_buddies_generated; /* number of buddies generated */
1628 atomic64_t s_mb_generation_time;
1629 atomic_t s_mb_lost_chunks;
1630 atomic_t s_mb_preallocated;
1631 atomic_t s_mb_discarded;
1632 atomic_t s_lock_busy;
1633
1634 /* locality groups */
1635 struct ext4_locality_group __percpu *s_locality_groups;
1636
1637 /* for write statistics */
1638 unsigned long s_sectors_written_start;
1639 u64 s_kbytes_written;
1640
1641 /* the size of zero-out chunk */
1642 unsigned int s_extent_max_zeroout_kb;
1643
1644 unsigned int s_log_groups_per_flex;
1645 struct flex_groups * __rcu *s_flex_groups;
1646 ext4_group_t s_flex_groups_allocated;
1647
1648 /* workqueue for reserved extent conversions (buffered io) */
1649 struct workqueue_struct *rsv_conversion_wq;
1650
1651 /* timer for periodic error stats printing */
1652 struct timer_list s_err_report;
1653
1654 /* Lazy inode table initialization info */
1655 struct ext4_li_request *s_li_request;
1656 /* Wait multiplier for lazy initialization thread */
1657 unsigned int s_li_wait_mult;
1658
1659 /* Kernel thread for multiple mount protection */
1660 struct task_struct *s_mmp_tsk;
1661
1662 /* record the last minlen when FITRIM is called. */
1663 unsigned long s_last_trim_minblks;
1664
1665 /* Reference to checksum algorithm driver via cryptoapi */
1666 struct crypto_shash *s_chksum_driver;
1667
1668 /* Precomputed FS UUID checksum for seeding other checksums */
1669 __u32 s_csum_seed;
1670
1671 /* Reclaim extents from extent status tree */
1672 struct shrinker *s_es_shrinker;
1673 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1674 long s_es_nr_inode;
1675 struct ext4_es_stats s_es_stats;
1676 struct mb_cache *s_ea_block_cache;
1677 struct mb_cache *s_ea_inode_cache;
1678 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1679
1680 /* Journal triggers for checksum computation */
1681 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1682
1683 /* Ratelimit ext4 messages. */
1684 struct ratelimit_state s_err_ratelimit_state;
1685 struct ratelimit_state s_warning_ratelimit_state;
1686 struct ratelimit_state s_msg_ratelimit_state;
1687 atomic_t s_warning_count;
1688 atomic_t s_msg_count;
1689
1690 /* Encryption policy for '-o test_dummy_encryption' */
1691 struct fscrypt_dummy_policy s_dummy_enc_policy;
1692
1693 /*
1694 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1695 * or EXTENTS flag or between writepages ops and changing DELALLOC or
1696 * DIOREAD_NOLOCK mount options on remount.
1697 */
1698 struct percpu_rw_semaphore s_writepages_rwsem;
1699 struct dax_device *s_daxdev;
1700 u64 s_dax_part_off;
1701#ifdef CONFIG_EXT4_DEBUG
1702 unsigned long s_simulate_fail;
1703#endif
1704 /* Record the errseq of the backing block device */
1705 errseq_t s_bdev_wb_err;
1706 spinlock_t s_bdev_wb_lock;
1707
1708 /* Information about errors that happened during this mount */
1709 spinlock_t s_error_lock;
1710 int s_add_error_count;
1711 int s_first_error_code;
1712 __u32 s_first_error_line;
1713 __u32 s_first_error_ino;
1714 __u64 s_first_error_block;
1715 const char *s_first_error_func;
1716 time64_t s_first_error_time;
1717 int s_last_error_code;
1718 __u32 s_last_error_line;
1719 __u32 s_last_error_ino;
1720 __u64 s_last_error_block;
1721 const char *s_last_error_func;
1722 time64_t s_last_error_time;
1723 /*
1724 * If we are in a context where we cannot update the on-disk
1725 * superblock, we queue the work here. This is used to update
1726 * the error information in the superblock, and for periodic
1727 * updates of the superblock called from the commit callback
1728 * function.
1729 */
1730 struct work_struct s_sb_upd_work;
1731
1732 /* Atomic write unit values in bytes */
1733 unsigned int s_awu_min;
1734 unsigned int s_awu_max;
1735
1736 /* Ext4 fast commit sub transaction ID */
1737 atomic_t s_fc_subtid;
1738
1739 /*
1740 * After commit starts, the main queue gets locked, and the further
1741 * updates get added in the staging queue.
1742 */
1743#define FC_Q_MAIN 0
1744#define FC_Q_STAGING 1
1745 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1746 * that have data changes in them.
1747 */
1748 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1749 unsigned int s_fc_bytes;
1750 /*
1751 * Main fast commit lock. This lock protects accesses to the
1752 * following fields:
1753 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1754 */
1755 spinlock_t s_fc_lock;
1756 struct buffer_head *s_fc_bh;
1757 struct ext4_fc_stats s_fc_stats;
1758 tid_t s_fc_ineligible_tid;
1759#ifdef CONFIG_EXT4_DEBUG
1760 int s_fc_debug_max_replay;
1761#endif
1762 struct ext4_fc_replay_state s_fc_replay_state;
1763};
1764
1765static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1766{
1767 return sb->s_fs_info;
1768}
1769static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1770{
1771 return container_of(inode, struct ext4_inode_info, vfs_inode);
1772}
1773
1774static inline int ext4_writepages_down_read(struct super_block *sb)
1775{
1776 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
1777 return memalloc_nofs_save();
1778}
1779
1780static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
1781{
1782 memalloc_nofs_restore(ctx);
1783 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
1784}
1785
1786static inline int ext4_writepages_down_write(struct super_block *sb)
1787{
1788 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
1789 return memalloc_nofs_save();
1790}
1791
1792static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
1793{
1794 memalloc_nofs_restore(ctx);
1795 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
1796}
1797
1798static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1799{
1800 return ino == EXT4_ROOT_INO ||
1801 (ino >= EXT4_FIRST_INO(sb) &&
1802 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1803}
1804
1805/*
1806 * Returns: sbi->field[index]
1807 * Used to access an array element from the following sbi fields which require
1808 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1809 * - s_group_desc
1810 * - s_group_info
1811 * - s_flex_group
1812 */
1813#define sbi_array_rcu_deref(sbi, field, index) \
1814({ \
1815 typeof(*((sbi)->field)) _v; \
1816 rcu_read_lock(); \
1817 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1818 rcu_read_unlock(); \
1819 _v; \
1820})
1821
1822/*
1823 * run-time mount flags
1824 */
1825enum {
1826 EXT4_MF_MNTDIR_SAMPLED,
1827 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */
1828};
1829
1830static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1831{
1832 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1833}
1834
1835static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1836{
1837 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1838}
1839
1840static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1841{
1842 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1843}
1844
1845
1846/*
1847 * Simulate_fail codes
1848 */
1849#define EXT4_SIM_BBITMAP_EIO 1
1850#define EXT4_SIM_BBITMAP_CRC 2
1851#define EXT4_SIM_IBITMAP_EIO 3
1852#define EXT4_SIM_IBITMAP_CRC 4
1853#define EXT4_SIM_INODE_EIO 5
1854#define EXT4_SIM_INODE_CRC 6
1855#define EXT4_SIM_DIRBLOCK_EIO 7
1856#define EXT4_SIM_DIRBLOCK_CRC 8
1857
1858static inline bool ext4_simulate_fail(struct super_block *sb,
1859 unsigned long code)
1860{
1861#ifdef CONFIG_EXT4_DEBUG
1862 struct ext4_sb_info *sbi = EXT4_SB(sb);
1863
1864 if (unlikely(sbi->s_simulate_fail == code)) {
1865 sbi->s_simulate_fail = 0;
1866 return true;
1867 }
1868#endif
1869 return false;
1870}
1871
1872/*
1873 * Error number codes for s_{first,last}_error_errno
1874 *
1875 * Linux errno numbers are architecture specific, so we need to translate
1876 * them into something which is architecture independent. We don't define
1877 * codes for all errno's; just the ones which are most likely to be the cause
1878 * of an ext4_error() call.
1879 */
1880#define EXT4_ERR_UNKNOWN 1
1881#define EXT4_ERR_EIO 2
1882#define EXT4_ERR_ENOMEM 3
1883#define EXT4_ERR_EFSBADCRC 4
1884#define EXT4_ERR_EFSCORRUPTED 5
1885#define EXT4_ERR_ENOSPC 6
1886#define EXT4_ERR_ENOKEY 7
1887#define EXT4_ERR_EROFS 8
1888#define EXT4_ERR_EFBIG 9
1889#define EXT4_ERR_EEXIST 10
1890#define EXT4_ERR_ERANGE 11
1891#define EXT4_ERR_EOVERFLOW 12
1892#define EXT4_ERR_EBUSY 13
1893#define EXT4_ERR_ENOTDIR 14
1894#define EXT4_ERR_ENOTEMPTY 15
1895#define EXT4_ERR_ESHUTDOWN 16
1896#define EXT4_ERR_EFAULT 17
1897
1898/*
1899 * Inode dynamic state flags
1900 */
1901enum {
1902 EXT4_STATE_NEW, /* inode is newly created */
1903 EXT4_STATE_XATTR, /* has in-inode xattrs */
1904 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1905 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1906 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1907 EXT4_STATE_NEWENTRY, /* File just added to dir */
1908 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1909 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1910 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1911 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1912 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1913 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
1914};
1915
1916#define EXT4_INODE_BIT_FNS(name, field, offset) \
1917static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1918{ \
1919 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1920} \
1921static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1922{ \
1923 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1924} \
1925static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1926{ \
1927 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1928}
1929
1930/* Add these declarations here only so that these functions can be
1931 * found by name. Otherwise, they are very hard to locate. */
1932static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1933static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1934static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1935EXT4_INODE_BIT_FNS(flag, flags, 0)
1936
1937/* Add these declarations here only so that these functions can be
1938 * found by name. Otherwise, they are very hard to locate. */
1939static inline int ext4_test_inode_state(struct inode *inode, int bit);
1940static inline void ext4_set_inode_state(struct inode *inode, int bit);
1941static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1942#if (BITS_PER_LONG < 64)
1943EXT4_INODE_BIT_FNS(state, state_flags, 0)
1944
1945static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1946{
1947 (ei)->i_state_flags = 0;
1948}
1949#else
1950EXT4_INODE_BIT_FNS(state, flags, 32)
1951
1952static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1953{
1954 /* We depend on the fact that callers will set i_flags */
1955}
1956#endif
1957#else
1958/* Assume that user mode programs are passing in an ext4fs superblock, not
1959 * a kernel struct super_block. This will allow us to call the feature-test
1960 * macros from user land. */
1961#define EXT4_SB(sb) (sb)
1962#endif
1963
1964static inline bool ext4_verity_in_progress(struct inode *inode)
1965{
1966 return IS_ENABLED(CONFIG_FS_VERITY) &&
1967 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1968}
1969
1970#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1971
1972/*
1973 * Codes for operating systems
1974 */
1975#define EXT4_OS_LINUX 0
1976#define EXT4_OS_HURD 1
1977#define EXT4_OS_MASIX 2
1978#define EXT4_OS_FREEBSD 3
1979#define EXT4_OS_LITES 4
1980
1981/*
1982 * Revision levels
1983 */
1984#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1985#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1986
1987#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1988
1989#define EXT4_GOOD_OLD_INODE_SIZE 128
1990
1991#define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1992#define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1993#define EXT4_TIMESTAMP_MIN S32_MIN
1994
1995/*
1996 * Feature set definitions
1997 */
1998
1999#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
2000#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
2001#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
2002#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
2003#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
2004#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
2005#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
2006/*
2007 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
2008 * incompatible only if fast commit blocks are present in the FS. Since we
2009 * clear the journal (and thus the fast commit blocks), we don't mark FS as
2010 * incompatible. We also have a JBD2 incompat feature, which gets set when
2011 * there are fast commit blocks present in the journal.
2012 */
2013#define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
2014#define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
2015#define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
2016
2017#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
2018#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
2019#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
2020#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
2021#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
2022#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
2023#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
2024#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
2025#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
2026/*
2027 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
2028 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2029 * all other data structures' checksums. However, the METADATA_CSUM and
2030 * GDT_CSUM bits are mutually exclusive.
2031 */
2032#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
2033#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
2034#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
2035#define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
2036#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be
2037 non-empty */
2038
2039#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
2040#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
2041#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
2042#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
2043#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
2044#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
2045#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
2046#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
2047#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
2048#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
2049#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
2050#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
2051#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
2052#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
2053#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
2054#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
2055
2056extern void ext4_update_dynamic_rev(struct super_block *sb);
2057
2058#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2059static inline bool ext4_has_feature_##name(struct super_block *sb) \
2060{ \
2061 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2062 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2063} \
2064static inline void ext4_set_feature_##name(struct super_block *sb) \
2065{ \
2066 ext4_update_dynamic_rev(sb); \
2067 EXT4_SB(sb)->s_es->s_feature_compat |= \
2068 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2069} \
2070static inline void ext4_clear_feature_##name(struct super_block *sb) \
2071{ \
2072 EXT4_SB(sb)->s_es->s_feature_compat &= \
2073 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2074}
2075
2076#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2077static inline bool ext4_has_feature_##name(struct super_block *sb) \
2078{ \
2079 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2080 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2081} \
2082static inline void ext4_set_feature_##name(struct super_block *sb) \
2083{ \
2084 ext4_update_dynamic_rev(sb); \
2085 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2086 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2087} \
2088static inline void ext4_clear_feature_##name(struct super_block *sb) \
2089{ \
2090 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2091 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2092}
2093
2094#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2095static inline bool ext4_has_feature_##name(struct super_block *sb) \
2096{ \
2097 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2098 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2099} \
2100static inline void ext4_set_feature_##name(struct super_block *sb) \
2101{ \
2102 ext4_update_dynamic_rev(sb); \
2103 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2104 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2105} \
2106static inline void ext4_clear_feature_##name(struct super_block *sb) \
2107{ \
2108 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2109 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2110}
2111
2112EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2113EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2114EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2115EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2116EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2117EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2118EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2119EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2120EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2121EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
2122
2123EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2124EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2125EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2126EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2127EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2128EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2129EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2130EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2131EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2132EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2133EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2134EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2135EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2136EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
2137
2138EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2139EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2140EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2141EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2142EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2143EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2144EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2145EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2146EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2147EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2148EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2149EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2150EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2151EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2152EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2153EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2154
2155#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2156#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2157 EXT4_FEATURE_INCOMPAT_META_BG)
2158#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2159 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2160 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2161
2162#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2163#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2164 EXT4_FEATURE_INCOMPAT_RECOVER| \
2165 EXT4_FEATURE_INCOMPAT_META_BG)
2166#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2167 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2168 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2169
2170#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2171 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2172#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2173 EXT4_FEATURE_INCOMPAT_RECOVER| \
2174 EXT4_FEATURE_INCOMPAT_META_BG| \
2175 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2176 EXT4_FEATURE_INCOMPAT_64BIT| \
2177 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2178 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2179 EXT4_FEATURE_INCOMPAT_MMP | \
2180 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2181 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2182 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2183 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2184 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2185#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2186 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2187 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2188 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2189 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2190 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2191 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2192 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2193 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2194 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2195 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2196 EXT4_FEATURE_RO_COMPAT_VERITY |\
2197 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2198
2199#define EXTN_FEATURE_FUNCS(ver) \
2200static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2201{ \
2202 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2203 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2204} \
2205static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2206{ \
2207 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2208 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2209} \
2210static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2211{ \
2212 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2213 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2214}
2215
2216EXTN_FEATURE_FUNCS(2)
2217EXTN_FEATURE_FUNCS(3)
2218EXTN_FEATURE_FUNCS(4)
2219
2220static inline bool ext4_has_compat_features(struct super_block *sb)
2221{
2222 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2223}
2224static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2225{
2226 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2227}
2228static inline bool ext4_has_incompat_features(struct super_block *sb)
2229{
2230 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2231}
2232
2233extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2234
2235/*
2236 * Superblock flags
2237 */
2238#define EXT4_FLAGS_RESIZING 0
2239#define EXT4_FLAGS_SHUTDOWN 1
2240#define EXT4_FLAGS_BDEV_IS_DAX 2
2241
2242static inline int ext4_forced_shutdown(struct super_block *sb)
2243{
2244 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
2245}
2246
2247/*
2248 * Default values for user and/or group using reserved blocks
2249 */
2250#define EXT4_DEF_RESUID 0
2251#define EXT4_DEF_RESGID 0
2252
2253/*
2254 * Default project ID
2255 */
2256#define EXT4_DEF_PROJID 0
2257
2258#define EXT4_DEF_INODE_READAHEAD_BLKS 32
2259
2260/*
2261 * Default mount options
2262 */
2263#define EXT4_DEFM_DEBUG 0x0001
2264#define EXT4_DEFM_BSDGROUPS 0x0002
2265#define EXT4_DEFM_XATTR_USER 0x0004
2266#define EXT4_DEFM_ACL 0x0008
2267#define EXT4_DEFM_UID16 0x0010
2268#define EXT4_DEFM_JMODE 0x0060
2269#define EXT4_DEFM_JMODE_DATA 0x0020
2270#define EXT4_DEFM_JMODE_ORDERED 0x0040
2271#define EXT4_DEFM_JMODE_WBACK 0x0060
2272#define EXT4_DEFM_NOBARRIER 0x0100
2273#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2274#define EXT4_DEFM_DISCARD 0x0400
2275#define EXT4_DEFM_NODELALLOC 0x0800
2276
2277/*
2278 * Default journal batch times
2279 */
2280#define EXT4_DEF_MIN_BATCH_TIME 0
2281#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2282
2283/*
2284 * Minimum number of groups in a flexgroup before we separate out
2285 * directories into the first block group of a flexgroup
2286 */
2287#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2288
2289/*
2290 * Structure of a directory entry
2291 */
2292#define EXT4_NAME_LEN 255
2293/*
2294 * Base length of the ext4 directory entry excluding the name length
2295 */
2296#define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2297
2298struct ext4_dir_entry {
2299 __le32 inode; /* Inode number */
2300 __le16 rec_len; /* Directory entry length */
2301 __le16 name_len; /* Name length */
2302 char name[EXT4_NAME_LEN]; /* File name */
2303};
2304
2305
2306/*
2307 * Encrypted Casefolded entries require saving the hash on disk. This structure
2308 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2309 * boundary.
2310 */
2311struct ext4_dir_entry_hash {
2312 __le32 hash;
2313 __le32 minor_hash;
2314};
2315
2316/*
2317 * The new version of the directory entry. Since EXT4 structures are
2318 * stored in intel byte order, and the name_len field could never be
2319 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2320 * file_type field.
2321 */
2322struct ext4_dir_entry_2 {
2323 __le32 inode; /* Inode number */
2324 __le16 rec_len; /* Directory entry length */
2325 __u8 name_len; /* Name length */
2326 __u8 file_type; /* See file type macros EXT4_FT_* below */
2327 char name[EXT4_NAME_LEN]; /* File name */
2328};
2329
2330/*
2331 * Access the hashes at the end of ext4_dir_entry_2
2332 */
2333#define EXT4_DIRENT_HASHES(entry) \
2334 ((struct ext4_dir_entry_hash *) \
2335 (((void *)(entry)) + \
2336 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2337#define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(entry)->hash)
2338#define EXT4_DIRENT_MINOR_HASH(entry) \
2339 le32_to_cpu(EXT4_DIRENT_HASHES(entry)->minor_hash)
2340
2341static inline bool ext4_hash_in_dirent(const struct inode *inode)
2342{
2343 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2344}
2345
2346/*
2347 * This is a bogus directory entry at the end of each leaf block that
2348 * records checksums.
2349 */
2350struct ext4_dir_entry_tail {
2351 __le32 det_reserved_zero1; /* Pretend to be unused */
2352 __le16 det_rec_len; /* 12 */
2353 __u8 det_reserved_zero2; /* Zero name length */
2354 __u8 det_reserved_ft; /* 0xDE, fake file type */
2355 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2356};
2357
2358#define EXT4_DIRENT_TAIL(block, blocksize) \
2359 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2360 ((blocksize) - \
2361 sizeof(struct ext4_dir_entry_tail))))
2362
2363/*
2364 * Ext4 directory file types. Only the low 3 bits are used. The
2365 * other bits are reserved for now.
2366 */
2367#define EXT4_FT_UNKNOWN 0
2368#define EXT4_FT_REG_FILE 1
2369#define EXT4_FT_DIR 2
2370#define EXT4_FT_CHRDEV 3
2371#define EXT4_FT_BLKDEV 4
2372#define EXT4_FT_FIFO 5
2373#define EXT4_FT_SOCK 6
2374#define EXT4_FT_SYMLINK 7
2375
2376#define EXT4_FT_MAX 8
2377
2378#define EXT4_FT_DIR_CSUM 0xDE
2379
2380/*
2381 * EXT4_DIR_PAD defines the directory entries boundaries
2382 *
2383 * NOTE: It must be a multiple of 4
2384 */
2385#define EXT4_DIR_PAD 4
2386#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2387#define EXT4_MAX_REC_LEN ((1<<16)-1)
2388
2389/*
2390 * The rec_len is dependent on the type of directory. Directories that are
2391 * casefolded and encrypted need to store the hash as well, so we add room for
2392 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2393 * pass NULL for dir, as those entries do not use the extra fields.
2394 */
2395static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2396 const struct inode *dir)
2397{
2398 int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2399
2400 if (dir && ext4_hash_in_dirent(dir))
2401 rec_len += sizeof(struct ext4_dir_entry_hash);
2402 return (rec_len & ~EXT4_DIR_ROUND);
2403}
2404
2405/*
2406 * If we ever get support for fs block sizes > page_size, we'll need
2407 * to remove the #if statements in the next two functions...
2408 */
2409static inline unsigned int
2410ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2411{
2412 unsigned len = le16_to_cpu(dlen);
2413
2414#if (PAGE_SIZE >= 65536)
2415 if (len == EXT4_MAX_REC_LEN || len == 0)
2416 return blocksize;
2417 return (len & 65532) | ((len & 3) << 16);
2418#else
2419 return len;
2420#endif
2421}
2422
2423static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2424{
2425 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2426#if (PAGE_SIZE >= 65536)
2427 if (len < 65536)
2428 return cpu_to_le16(len);
2429 if (len == blocksize) {
2430 if (blocksize == 65536)
2431 return cpu_to_le16(EXT4_MAX_REC_LEN);
2432 else
2433 return cpu_to_le16(0);
2434 }
2435 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2436#else
2437 return cpu_to_le16(len);
2438#endif
2439}
2440
2441/*
2442 * Hash Tree Directory indexing
2443 * (c) Daniel Phillips, 2001
2444 */
2445
2446#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2447 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2448#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2449 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2450#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2451
2452/* Legal values for the dx_root hash_version field: */
2453
2454#define DX_HASH_LEGACY 0
2455#define DX_HASH_HALF_MD4 1
2456#define DX_HASH_TEA 2
2457#define DX_HASH_LEGACY_UNSIGNED 3
2458#define DX_HASH_HALF_MD4_UNSIGNED 4
2459#define DX_HASH_TEA_UNSIGNED 5
2460#define DX_HASH_SIPHASH 6
2461#define DX_HASH_LAST DX_HASH_SIPHASH
2462
2463static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2464 const void *address, unsigned int length)
2465{
2466 struct {
2467 struct shash_desc shash;
2468 char ctx[4];
2469 } desc;
2470
2471 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2472
2473 desc.shash.tfm = sbi->s_chksum_driver;
2474 *(u32 *)desc.ctx = crc;
2475
2476 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2477
2478 return *(u32 *)desc.ctx;
2479}
2480
2481#ifdef __KERNEL__
2482
2483/* hash info structure used by the directory hash */
2484struct dx_hash_info
2485{
2486 u32 hash;
2487 u32 minor_hash;
2488 int hash_version;
2489 u32 *seed;
2490};
2491
2492
2493/* 32 and 64 bit signed EOF for dx directories */
2494#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2495#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2496
2497
2498/*
2499 * Control parameters used by ext4_htree_next_block
2500 */
2501#define HASH_NB_ALWAYS 1
2502
2503struct ext4_filename {
2504 const struct qstr *usr_fname;
2505 struct fscrypt_str disk_name;
2506 struct dx_hash_info hinfo;
2507#ifdef CONFIG_FS_ENCRYPTION
2508 struct fscrypt_str crypto_buf;
2509#endif
2510#if IS_ENABLED(CONFIG_UNICODE)
2511 struct qstr cf_name;
2512#endif
2513};
2514
2515#define fname_name(p) ((p)->disk_name.name)
2516#define fname_usr_name(p) ((p)->usr_fname->name)
2517#define fname_len(p) ((p)->disk_name.len)
2518
2519/*
2520 * Describe an inode's exact location on disk and in memory
2521 */
2522struct ext4_iloc
2523{
2524 struct buffer_head *bh;
2525 unsigned long offset;
2526 ext4_group_t block_group;
2527};
2528
2529static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2530{
2531 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2532}
2533
2534static inline bool ext4_is_quota_file(struct inode *inode)
2535{
2536 return IS_NOQUOTA(inode) &&
2537 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2538}
2539
2540/*
2541 * This structure is stuffed into the struct file's private_data field
2542 * for directories. It is where we put information so that we can do
2543 * readdir operations in hash tree order.
2544 */
2545struct dir_private_info {
2546 struct rb_root root;
2547 struct rb_node *curr_node;
2548 struct fname *extra_fname;
2549 loff_t last_pos;
2550 __u32 curr_hash;
2551 __u32 curr_minor_hash;
2552 __u32 next_hash;
2553 u64 cookie;
2554 bool initialized;
2555};
2556
2557/* calculate the first block number of the group */
2558static inline ext4_fsblk_t
2559ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2560{
2561 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2562 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2563}
2564
2565/*
2566 * Special error return code only used by dx_probe() and its callers.
2567 */
2568#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2569
2570/* htree levels for ext4 */
2571#define EXT4_HTREE_LEVEL_COMPAT 2
2572#define EXT4_HTREE_LEVEL 3
2573
2574static inline int ext4_dir_htree_level(struct super_block *sb)
2575{
2576 return ext4_has_feature_largedir(sb) ?
2577 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2578}
2579
2580/*
2581 * Timeout and state flag for lazy initialization inode thread.
2582 */
2583#define EXT4_DEF_LI_WAIT_MULT 10
2584#define EXT4_DEF_LI_MAX_START_DELAY 5
2585#define EXT4_LAZYINIT_QUIT 0x0001
2586#define EXT4_LAZYINIT_RUNNING 0x0002
2587
2588/*
2589 * Lazy inode table initialization info
2590 */
2591struct ext4_lazy_init {
2592 unsigned long li_state;
2593 struct list_head li_request_list;
2594 struct mutex li_list_mtx;
2595};
2596
2597enum ext4_li_mode {
2598 EXT4_LI_MODE_PREFETCH_BBITMAP,
2599 EXT4_LI_MODE_ITABLE,
2600};
2601
2602struct ext4_li_request {
2603 struct super_block *lr_super;
2604 enum ext4_li_mode lr_mode;
2605 ext4_group_t lr_first_not_zeroed;
2606 ext4_group_t lr_next_group;
2607 struct list_head lr_request;
2608 unsigned long lr_next_sched;
2609 unsigned long lr_timeout;
2610};
2611
2612struct ext4_features {
2613 struct kobject f_kobj;
2614 struct completion f_kobj_unregister;
2615};
2616
2617/*
2618 * This structure will be used for multiple mount protection. It will be
2619 * written into the block number saved in the s_mmp_block field in the
2620 * superblock. Programs that check MMP should assume that if
2621 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2622 * to use the filesystem, regardless of how old the timestamp is.
2623 */
2624#define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2625#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2626#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2627#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2628
2629struct mmp_struct {
2630 __le32 mmp_magic; /* Magic number for MMP */
2631 __le32 mmp_seq; /* Sequence no. updated periodically */
2632
2633 /*
2634 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2635 * purposes and do not affect the correctness of the algorithm
2636 */
2637 __le64 mmp_time; /* Time last updated */
2638 char mmp_nodename[64]; /* Node which last updated MMP block */
2639 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2640
2641 /*
2642 * mmp_check_interval is used to verify if the MMP block has been
2643 * updated on the block device. The value is updated based on the
2644 * maximum time to write the MMP block during an update cycle.
2645 */
2646 __le16 mmp_check_interval;
2647
2648 __le16 mmp_pad1;
2649 __le32 mmp_pad2[226];
2650 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2651};
2652
2653/* arguments passed to the mmp thread */
2654struct mmpd_data {
2655 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2656 struct super_block *sb; /* super block of the fs */
2657};
2658
2659/*
2660 * Check interval multiplier
2661 * The MMP block is written every update interval and initially checked every
2662 * update interval x the multiplier (the value is then adapted based on the
2663 * write latency). The reason is that writes can be delayed under load and we
2664 * don't want readers to incorrectly assume that the filesystem is no longer
2665 * in use.
2666 */
2667#define EXT4_MMP_CHECK_MULT 2UL
2668
2669/*
2670 * Minimum interval for MMP checking in seconds.
2671 */
2672#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2673
2674/*
2675 * Maximum interval for MMP checking in seconds.
2676 */
2677#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2678
2679/*
2680 * Function prototypes
2681 */
2682
2683/*
2684 * Ok, these declarations are also in <linux/kernel.h> but none of the
2685 * ext4 source programs needs to include it so they are duplicated here.
2686 */
2687# define NORET_TYPE /**/
2688# define ATTRIB_NORET __attribute__((noreturn))
2689# define NORET_AND noreturn,
2690
2691/* bitmap.c */
2692extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2693void ext4_inode_bitmap_csum_set(struct super_block *sb,
2694 struct ext4_group_desc *gdp,
2695 struct buffer_head *bh);
2696int ext4_inode_bitmap_csum_verify(struct super_block *sb,
2697 struct ext4_group_desc *gdp,
2698 struct buffer_head *bh);
2699void ext4_block_bitmap_csum_set(struct super_block *sb,
2700 struct ext4_group_desc *gdp,
2701 struct buffer_head *bh);
2702int ext4_block_bitmap_csum_verify(struct super_block *sb,
2703 struct ext4_group_desc *gdp,
2704 struct buffer_head *bh);
2705
2706/* balloc.c */
2707extern void ext4_get_group_no_and_offset(struct super_block *sb,
2708 ext4_fsblk_t blocknr,
2709 ext4_group_t *blockgrpp,
2710 ext4_grpblk_t *offsetp);
2711extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2712 ext4_fsblk_t block);
2713
2714extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2715extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2716 ext4_group_t group);
2717extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2718 ext4_fsblk_t goal,
2719 unsigned int flags,
2720 unsigned long *count,
2721 int *errp);
2722extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2723 s64 nclusters, unsigned int flags);
2724extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2725extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2726 ext4_group_t block_group,
2727 struct buffer_head ** bh);
2728extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2729 ext4_group_t group);
2730extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2731
2732extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2733 ext4_group_t block_group,
2734 bool ignore_locked);
2735extern int ext4_wait_block_bitmap(struct super_block *sb,
2736 ext4_group_t block_group,
2737 struct buffer_head *bh);
2738extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2739 ext4_group_t block_group);
2740extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2741 ext4_group_t block_group,
2742 struct ext4_group_desc *gdp);
2743ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2744
2745#if IS_ENABLED(CONFIG_UNICODE)
2746extern int ext4_fname_setup_ci_filename(struct inode *dir,
2747 const struct qstr *iname,
2748 struct ext4_filename *fname);
2749
2750static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2751{
2752 kfree(fname->cf_name.name);
2753 fname->cf_name.name = NULL;
2754}
2755#else
2756static inline int ext4_fname_setup_ci_filename(struct inode *dir,
2757 const struct qstr *iname,
2758 struct ext4_filename *fname)
2759{
2760 return 0;
2761}
2762
2763static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2764{
2765}
2766#endif
2767
2768/* ext4 encryption related stuff goes here crypto.c */
2769#ifdef CONFIG_FS_ENCRYPTION
2770extern const struct fscrypt_operations ext4_cryptops;
2771
2772int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2773 int lookup, struct ext4_filename *fname);
2774
2775int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2776 struct ext4_filename *fname);
2777
2778void ext4_fname_free_filename(struct ext4_filename *fname);
2779
2780int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2781
2782#else /* !CONFIG_FS_ENCRYPTION */
2783static inline int ext4_fname_setup_filename(struct inode *dir,
2784 const struct qstr *iname,
2785 int lookup,
2786 struct ext4_filename *fname)
2787{
2788 fname->usr_fname = iname;
2789 fname->disk_name.name = (unsigned char *) iname->name;
2790 fname->disk_name.len = iname->len;
2791
2792 return ext4_fname_setup_ci_filename(dir, iname, fname);
2793}
2794
2795static inline int ext4_fname_prepare_lookup(struct inode *dir,
2796 struct dentry *dentry,
2797 struct ext4_filename *fname)
2798{
2799 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2800}
2801
2802static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2803{
2804 ext4_fname_free_ci_filename(fname);
2805}
2806
2807static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2808 void __user *arg)
2809{
2810 return -EOPNOTSUPP;
2811}
2812#endif /* !CONFIG_FS_ENCRYPTION */
2813
2814/* dir.c */
2815extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2816 struct file *,
2817 struct ext4_dir_entry_2 *,
2818 struct buffer_head *, char *, int,
2819 unsigned int);
2820#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2821 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2822 (de), (bh), (buf), (size), (offset)))
2823extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2824 __u32 minor_hash,
2825 struct ext4_dir_entry_2 *dirent,
2826 struct fscrypt_str *ent_name);
2827extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2828extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2829 struct buffer_head *bh,
2830 void *buf, int buf_size,
2831 struct ext4_filename *fname,
2832 struct ext4_dir_entry_2 **dest_de);
2833void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2834 struct ext4_dir_entry_2 *de,
2835 int buf_size,
2836 struct ext4_filename *fname);
2837static inline void ext4_update_dx_flag(struct inode *inode)
2838{
2839 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2840 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2841 /* ext4_iget() should have caught this... */
2842 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2843 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2844 }
2845}
2846static const unsigned char ext4_filetype_table[] = {
2847 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2848};
2849
2850static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2851{
2852 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2853 return DT_UNKNOWN;
2854
2855 return ext4_filetype_table[filetype];
2856}
2857extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2858 void *buf, int buf_size);
2859
2860/* fsync.c */
2861extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2862
2863/* hash.c */
2864extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2865 struct dx_hash_info *hinfo);
2866
2867/* ialloc.c */
2868extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2869extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,
2870 struct inode *, umode_t,
2871 const struct qstr *qstr, __u32 goal,
2872 uid_t *owner, __u32 i_flags,
2873 int handle_type, unsigned int line_no,
2874 int nblocks);
2875
2876#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2877 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \
2878 (goal), (owner), i_flags, 0, 0, 0)
2879#define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
2880 type, nblocks) \
2881 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
2882 0, (type), __LINE__, (nblocks))
2883
2884
2885extern void ext4_free_inode(handle_t *, struct inode *);
2886extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2887extern unsigned long ext4_count_free_inodes(struct super_block *);
2888extern unsigned long ext4_count_dirs(struct super_block *);
2889extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2890extern int ext4_init_inode_table(struct super_block *sb,
2891 ext4_group_t group, int barrier);
2892extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2893
2894/* fast_commit.c */
2895int ext4_fc_info_show(struct seq_file *seq, void *v);
2896void ext4_fc_init(struct super_block *sb, journal_t *journal);
2897void ext4_fc_init_inode(struct inode *inode);
2898void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2899 ext4_lblk_t end);
2900void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2901 struct dentry *dentry);
2902void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2903 struct dentry *dentry);
2904void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2905void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2906void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2907 struct dentry *dentry);
2908void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2909void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2910void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2911void ext4_fc_start_update(struct inode *inode);
2912void ext4_fc_stop_update(struct inode *inode);
2913void ext4_fc_del(struct inode *inode);
2914bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2915void ext4_fc_replay_cleanup(struct super_block *sb);
2916int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2917int __init ext4_fc_init_dentry_cache(void);
2918void ext4_fc_destroy_dentry_cache(void);
2919int ext4_fc_record_regions(struct super_block *sb, int ino,
2920 ext4_lblk_t lblk, ext4_fsblk_t pblk,
2921 int len, int replay);
2922
2923/* mballoc.c */
2924extern const struct seq_operations ext4_mb_seq_groups_ops;
2925extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2926extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2927extern int ext4_mb_init(struct super_block *);
2928extern void ext4_mb_release(struct super_block *);
2929extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2930 struct ext4_allocation_request *, int *);
2931extern void ext4_discard_preallocations(struct inode *);
2932extern int __init ext4_init_mballoc(void);
2933extern void ext4_exit_mballoc(void);
2934extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2935 ext4_group_t group,
2936 unsigned int nr, int *cnt);
2937extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2938 unsigned int nr);
2939
2940extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2941 struct buffer_head *bh, ext4_fsblk_t block,
2942 unsigned long count, int flags);
2943extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2944 ext4_group_t ngroups);
2945extern int ext4_mb_add_groupinfo(struct super_block *sb,
2946 ext4_group_t i, struct ext4_group_desc *desc);
2947extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2948 ext4_fsblk_t block, unsigned long count);
2949extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2950extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2951extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2952 int len, bool state);
2953static inline bool ext4_mb_cr_expensive(enum criteria cr)
2954{
2955 return cr >= CR_GOAL_LEN_SLOW;
2956}
2957
2958/* inode.c */
2959void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2960 struct ext4_inode_info *ei);
2961int ext4_inode_is_fast_symlink(struct inode *inode);
2962struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2963struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2964int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2965 bool wait, struct buffer_head **bhs);
2966int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2967 struct buffer_head *bh_result, int create);
2968int ext4_get_block(struct inode *inode, sector_t iblock,
2969 struct buffer_head *bh_result, int create);
2970int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2971 struct buffer_head *bh, int create);
2972int ext4_walk_page_buffers(handle_t *handle,
2973 struct inode *inode,
2974 struct buffer_head *head,
2975 unsigned from,
2976 unsigned to,
2977 int *partial,
2978 int (*fn)(handle_t *handle, struct inode *inode,
2979 struct buffer_head *bh));
2980int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2981 struct buffer_head *bh);
2982#define FALL_BACK_TO_NONDELALLOC 1
2983#define CONVERT_INLINE_DATA 2
2984
2985typedef enum {
2986 EXT4_IGET_NORMAL = 0,
2987 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2988 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */
2989 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */
2990 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */
2991} ext4_iget_flags;
2992
2993extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2994 ext4_iget_flags flags, const char *function,
2995 unsigned int line);
2996
2997#define ext4_iget(sb, ino, flags) \
2998 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2999
3000extern int ext4_write_inode(struct inode *, struct writeback_control *);
3001extern int ext4_setattr(struct mnt_idmap *, struct dentry *,
3002 struct iattr *);
3003extern u32 ext4_dio_alignment(struct inode *inode);
3004extern int ext4_getattr(struct mnt_idmap *, const struct path *,
3005 struct kstat *, u32, unsigned int);
3006extern void ext4_evict_inode(struct inode *);
3007extern void ext4_clear_inode(struct inode *);
3008extern int ext4_file_getattr(struct mnt_idmap *, const struct path *,
3009 struct kstat *, u32, unsigned int);
3010extern void ext4_dirty_inode(struct inode *, int);
3011extern int ext4_change_inode_journal_flag(struct inode *, int);
3012extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
3013extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
3014 struct ext4_iloc *iloc);
3015extern int ext4_inode_attach_jinode(struct inode *inode);
3016extern int ext4_can_truncate(struct inode *inode);
3017extern int ext4_truncate(struct inode *);
3018extern int ext4_break_layouts(struct inode *);
3019extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
3020extern void ext4_set_inode_flags(struct inode *, bool init);
3021extern int ext4_alloc_da_blocks(struct inode *inode);
3022extern void ext4_set_aops(struct inode *inode);
3023extern int ext4_writepage_trans_blocks(struct inode *);
3024extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
3025extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3026extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3027 loff_t lstart, loff_t lend);
3028extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3029extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3030extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3031extern void ext4_da_release_space(struct inode *inode, int to_free);
3032extern void ext4_da_update_reserve_space(struct inode *inode,
3033 int used, int quota_claim);
3034extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3035 ext4_fsblk_t pblk, ext4_lblk_t len);
3036
3037/* indirect.c */
3038extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3039 struct ext4_map_blocks *map, int flags);
3040extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3041extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3042extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3043 ext4_lblk_t start, ext4_lblk_t end);
3044
3045/* ioctl.c */
3046extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3047extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3048int ext4_fileattr_set(struct mnt_idmap *idmap,
3049 struct dentry *dentry, struct fileattr *fa);
3050int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3051extern void ext4_reset_inode_seed(struct inode *inode);
3052int ext4_update_overhead(struct super_block *sb, bool force);
3053int ext4_force_shutdown(struct super_block *sb, u32 flags);
3054
3055/* migrate.c */
3056extern int ext4_ext_migrate(struct inode *);
3057extern int ext4_ind_migrate(struct inode *inode);
3058
3059/* namei.c */
3060extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3061 struct inode *inode);
3062extern int ext4_dirblock_csum_verify(struct inode *inode,
3063 struct buffer_head *bh);
3064extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3065 __u32 start_minor_hash, __u32 *next_hash);
3066extern int ext4_search_dir(struct buffer_head *bh,
3067 char *search_buf,
3068 int buf_size,
3069 struct inode *dir,
3070 struct ext4_filename *fname,
3071 unsigned int offset,
3072 struct ext4_dir_entry_2 **res_dir);
3073extern int ext4_generic_delete_entry(struct inode *dir,
3074 struct ext4_dir_entry_2 *de_del,
3075 struct buffer_head *bh,
3076 void *entry_buf,
3077 int buf_size,
3078 int csum_size);
3079extern bool ext4_empty_dir(struct inode *inode);
3080
3081/* resize.c */
3082extern void ext4_kvfree_array_rcu(void *to_free);
3083extern int ext4_group_add(struct super_block *sb,
3084 struct ext4_new_group_data *input);
3085extern int ext4_group_extend(struct super_block *sb,
3086 struct ext4_super_block *es,
3087 ext4_fsblk_t n_blocks_count);
3088extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3089extern unsigned int ext4_list_backups(struct super_block *sb,
3090 unsigned int *three, unsigned int *five,
3091 unsigned int *seven);
3092
3093/* super.c */
3094extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3095 sector_t block, blk_opf_t op_flags);
3096extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3097 sector_t block);
3098extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3099 bh_end_io_t *end_io, bool simu_fail);
3100extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3101 bh_end_io_t *end_io, bool simu_fail);
3102extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3103extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3104extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3105extern int ext4_calculate_overhead(struct super_block *sb);
3106extern __le32 ext4_superblock_csum(struct super_block *sb,
3107 struct ext4_super_block *es);
3108extern void ext4_superblock_csum_set(struct super_block *sb);
3109extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3110 ext4_group_t ngroup);
3111extern const char *ext4_decode_error(struct super_block *sb, int errno,
3112 char nbuf[16]);
3113extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3114 ext4_group_t block_group,
3115 unsigned int flags);
3116extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb,
3117 ext4_group_t block_group);
3118
3119extern __printf(7, 8)
3120void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3121 int, __u64, const char *, ...);
3122extern __printf(6, 7)
3123void __ext4_error_inode(struct inode *, const char *, unsigned int,
3124 ext4_fsblk_t, int, const char *, ...);
3125extern __printf(5, 6)
3126void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3127 const char *, ...);
3128extern void __ext4_std_error(struct super_block *, const char *,
3129 unsigned int, int);
3130extern __printf(4, 5)
3131void __ext4_warning(struct super_block *, const char *, unsigned int,
3132 const char *, ...);
3133extern __printf(4, 5)
3134void __ext4_warning_inode(const struct inode *inode, const char *function,
3135 unsigned int line, const char *fmt, ...);
3136extern __printf(3, 4)
3137void __ext4_msg(struct super_block *, const char *, const char *, ...);
3138extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3139 const char *, unsigned int, const char *);
3140extern __printf(7, 8)
3141void __ext4_grp_locked_error(const char *, unsigned int,
3142 struct super_block *, ext4_group_t,
3143 unsigned long, ext4_fsblk_t,
3144 const char *, ...);
3145
3146#define EXT4_ERROR_INODE(inode, fmt, a...) \
3147 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3148
3149#define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3150 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3151
3152#define ext4_error_inode_block(inode, block, err, fmt, a...) \
3153 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3154 (fmt), ## a)
3155
3156#define EXT4_ERROR_FILE(file, block, fmt, a...) \
3157 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3158
3159#define ext4_abort(sb, err, fmt, a...) \
3160 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3161
3162#ifdef CONFIG_PRINTK
3163
3164#define ext4_error_inode(inode, func, line, block, fmt, ...) \
3165 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3166#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3167 __ext4_error_inode((inode), (func), (line), (block), \
3168 (err), (fmt), ##__VA_ARGS__)
3169#define ext4_error_file(file, func, line, block, fmt, ...) \
3170 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3171#define ext4_error(sb, fmt, ...) \
3172 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3173 ##__VA_ARGS__)
3174#define ext4_error_err(sb, err, fmt, ...) \
3175 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3176 ##__VA_ARGS__)
3177#define ext4_warning(sb, fmt, ...) \
3178 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3179#define ext4_warning_inode(inode, fmt, ...) \
3180 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3181#define ext4_msg(sb, level, fmt, ...) \
3182 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3183#define dump_mmp_msg(sb, mmp, msg) \
3184 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3185#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3186 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3187 fmt, ##__VA_ARGS__)
3188
3189#else
3190
3191#define ext4_error_inode(inode, func, line, block, fmt, ...) \
3192do { \
3193 no_printk(fmt, ##__VA_ARGS__); \
3194 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3195} while (0)
3196#define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3197do { \
3198 no_printk(fmt, ##__VA_ARGS__); \
3199 __ext4_error_inode(inode, "", 0, block, err, " "); \
3200} while (0)
3201#define ext4_error_file(file, func, line, block, fmt, ...) \
3202do { \
3203 no_printk(fmt, ##__VA_ARGS__); \
3204 __ext4_error_file(file, "", 0, block, " "); \
3205} while (0)
3206#define ext4_error(sb, fmt, ...) \
3207do { \
3208 no_printk(fmt, ##__VA_ARGS__); \
3209 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3210} while (0)
3211#define ext4_error_err(sb, err, fmt, ...) \
3212do { \
3213 no_printk(fmt, ##__VA_ARGS__); \
3214 __ext4_error(sb, "", 0, false, err, 0, " "); \
3215} while (0)
3216#define ext4_warning(sb, fmt, ...) \
3217do { \
3218 no_printk(fmt, ##__VA_ARGS__); \
3219 __ext4_warning(sb, "", 0, " "); \
3220} while (0)
3221#define ext4_warning_inode(inode, fmt, ...) \
3222do { \
3223 no_printk(fmt, ##__VA_ARGS__); \
3224 __ext4_warning_inode(inode, "", 0, " "); \
3225} while (0)
3226#define ext4_msg(sb, level, fmt, ...) \
3227do { \
3228 no_printk(fmt, ##__VA_ARGS__); \
3229 __ext4_msg(sb, "", " "); \
3230} while (0)
3231#define dump_mmp_msg(sb, mmp, msg) \
3232 __dump_mmp_msg(sb, mmp, "", 0, "")
3233#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3234do { \
3235 no_printk(fmt, ##__VA_ARGS__); \
3236 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3237} while (0)
3238
3239#endif
3240
3241extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3242 struct ext4_group_desc *bg);
3243extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3244 struct ext4_group_desc *bg);
3245extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3246 struct ext4_group_desc *bg);
3247extern __u32 ext4_free_group_clusters(struct super_block *sb,
3248 struct ext4_group_desc *bg);
3249extern __u32 ext4_free_inodes_count(struct super_block *sb,
3250 struct ext4_group_desc *bg);
3251extern __u32 ext4_used_dirs_count(struct super_block *sb,
3252 struct ext4_group_desc *bg);
3253extern __u32 ext4_itable_unused_count(struct super_block *sb,
3254 struct ext4_group_desc *bg);
3255extern void ext4_block_bitmap_set(struct super_block *sb,
3256 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3257extern void ext4_inode_bitmap_set(struct super_block *sb,
3258 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3259extern void ext4_inode_table_set(struct super_block *sb,
3260 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3261extern void ext4_free_group_clusters_set(struct super_block *sb,
3262 struct ext4_group_desc *bg,
3263 __u32 count);
3264extern void ext4_free_inodes_set(struct super_block *sb,
3265 struct ext4_group_desc *bg, __u32 count);
3266extern void ext4_used_dirs_set(struct super_block *sb,
3267 struct ext4_group_desc *bg, __u32 count);
3268extern void ext4_itable_unused_set(struct super_block *sb,
3269 struct ext4_group_desc *bg, __u32 count);
3270extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3271 struct ext4_group_desc *gdp);
3272extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3273 struct ext4_group_desc *gdp);
3274extern int ext4_register_li_request(struct super_block *sb,
3275 ext4_group_t first_not_zeroed);
3276
3277static inline int ext4_has_metadata_csum(struct super_block *sb)
3278{
3279 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3280 !EXT4_SB(sb)->s_chksum_driver);
3281
3282 return ext4_has_feature_metadata_csum(sb) &&
3283 (EXT4_SB(sb)->s_chksum_driver != NULL);
3284}
3285
3286static inline int ext4_has_group_desc_csum(struct super_block *sb)
3287{
3288 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3289}
3290
3291#define ext4_read_incompat_64bit_val(es, name) \
3292 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3293 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3294 le32_to_cpu(es->name##_lo))
3295
3296static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3297{
3298 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3299}
3300
3301static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3302{
3303 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3304}
3305
3306static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3307{
3308 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3309}
3310
3311static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3312 ext4_fsblk_t blk)
3313{
3314 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3315 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3316}
3317
3318static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3319 ext4_fsblk_t blk)
3320{
3321 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3322 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3323}
3324
3325static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3326 ext4_fsblk_t blk)
3327{
3328 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3329 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3330}
3331
3332static inline loff_t ext4_isize(struct super_block *sb,
3333 struct ext4_inode *raw_inode)
3334{
3335 if (ext4_has_feature_largedir(sb) ||
3336 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3337 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3338 le32_to_cpu(raw_inode->i_size_lo);
3339
3340 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3341}
3342
3343static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3344{
3345 raw_inode->i_size_lo = cpu_to_le32(i_size);
3346 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3347}
3348
3349/*
3350 * Reading s_groups_count requires using smp_rmb() afterwards. See
3351 * the locking protocol documented in the comments of ext4_group_add()
3352 * in resize.c
3353 */
3354static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3355{
3356 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3357
3358 smp_rmb();
3359 return ngroups;
3360}
3361
3362static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3363 ext4_group_t block_group)
3364{
3365 return block_group >> sbi->s_log_groups_per_flex;
3366}
3367
3368static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3369{
3370 return 1 << sbi->s_log_groups_per_flex;
3371}
3372
3373#define ext4_std_error(sb, errno) \
3374do { \
3375 if ((errno)) \
3376 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3377} while (0)
3378
3379#ifdef CONFIG_SMP
3380/* Each CPU can accumulate percpu_counter_batch clusters in their local
3381 * counters. So we need to make sure we have free clusters more
3382 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3383 */
3384#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3385#else
3386#define EXT4_FREECLUSTERS_WATERMARK 0
3387#endif
3388
3389/* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3390static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3391{
3392 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3393 !inode_is_locked(inode));
3394 down_write(&EXT4_I(inode)->i_data_sem);
3395 if (newsize > EXT4_I(inode)->i_disksize)
3396 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3397 up_write(&EXT4_I(inode)->i_data_sem);
3398}
3399
3400/* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3401static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3402{
3403 int changed = 0;
3404
3405 if (newsize > inode->i_size) {
3406 i_size_write(inode, newsize);
3407 changed = 1;
3408 }
3409 if (newsize > EXT4_I(inode)->i_disksize) {
3410 ext4_update_i_disksize(inode, newsize);
3411 changed |= 2;
3412 }
3413 return changed;
3414}
3415
3416int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3417 loff_t len);
3418
3419struct ext4_group_info {
3420 unsigned long bb_state;
3421#ifdef AGGRESSIVE_CHECK
3422 unsigned long bb_check_counter;
3423#endif
3424 struct rb_root bb_free_root;
3425 ext4_grpblk_t bb_first_free; /* first free block */
3426 ext4_grpblk_t bb_free; /* total free blocks */
3427 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3428 int bb_avg_fragment_size_order; /* order of average
3429 fragment in BG */
3430 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3431 ext4_group_t bb_group; /* Group number */
3432 struct list_head bb_prealloc_list;
3433#ifdef DOUBLE_CHECK
3434 void *bb_bitmap;
3435#endif
3436 struct rw_semaphore alloc_sem;
3437 struct list_head bb_avg_fragment_size_node;
3438 struct list_head bb_largest_free_order_node;
3439 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3440 * regions, index is order.
3441 * bb_counters[3] = 5 means
3442 * 5 free 8-block regions. */
3443};
3444
3445#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3446#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3447#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3448#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3449#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3450 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3451#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3452 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3453#define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3454
3455#define EXT4_MB_GRP_NEED_INIT(grp) \
3456 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3457#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3458 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3459#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3460 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3461
3462#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3463 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3464#define EXT4_MB_GRP_SET_TRIMMED(grp) \
3465 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3466#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3467 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3468#define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3469 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3470
3471#define EXT4_MAX_CONTENTION 8
3472#define EXT4_CONTENTION_THRESHOLD 2
3473
3474static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3475 ext4_group_t group)
3476{
3477 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3478}
3479
3480/*
3481 * Returns true if the filesystem is busy enough that attempts to
3482 * access the block group locks has run into contention.
3483 */
3484static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3485{
3486 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3487}
3488
3489static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3490{
3491 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3492 if (spin_trylock(lock))
3493 /*
3494 * We're able to grab the lock right away, so drop the
3495 * lock contention counter.
3496 */
3497 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3498 else {
3499 /*
3500 * The lock is busy, so bump the contention counter,
3501 * and then wait on the spin lock.
3502 */
3503 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3504 EXT4_MAX_CONTENTION);
3505 spin_lock(lock);
3506 }
3507}
3508
3509static inline void ext4_unlock_group(struct super_block *sb,
3510 ext4_group_t group)
3511{
3512 spin_unlock(ext4_group_lock_ptr(sb, group));
3513}
3514
3515#ifdef CONFIG_QUOTA
3516static inline bool ext4_quota_capable(struct super_block *sb)
3517{
3518 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3519}
3520
3521static inline bool ext4_is_quota_journalled(struct super_block *sb)
3522{
3523 struct ext4_sb_info *sbi = EXT4_SB(sb);
3524
3525 return (ext4_has_feature_quota(sb) ||
3526 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3527}
3528int ext4_enable_quotas(struct super_block *sb);
3529#endif
3530
3531/*
3532 * Block validity checking
3533 */
3534#define ext4_check_indirect_blockref(inode, bh) \
3535 ext4_check_blockref(__func__, __LINE__, inode, \
3536 (__le32 *)(bh)->b_data, \
3537 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3538
3539#define ext4_ind_check_inode(inode) \
3540 ext4_check_blockref(__func__, __LINE__, inode, \
3541 EXT4_I(inode)->i_data, \
3542 EXT4_NDIR_BLOCKS)
3543
3544/*
3545 * Inodes and files operations
3546 */
3547
3548/* dir.c */
3549extern const struct file_operations ext4_dir_operations;
3550
3551/* file.c */
3552extern const struct inode_operations ext4_file_inode_operations;
3553extern const struct file_operations ext4_file_operations;
3554extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3555
3556/* inline.c */
3557extern int ext4_get_max_inline_size(struct inode *inode);
3558extern int ext4_find_inline_data_nolock(struct inode *inode);
3559extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3560
3561int ext4_readpage_inline(struct inode *inode, struct folio *folio);
3562extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3563 struct inode *inode,
3564 loff_t pos, unsigned len,
3565 struct folio **foliop);
3566int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
3567 unsigned copied, struct folio *folio);
3568extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3569 struct inode *inode,
3570 loff_t pos, unsigned len,
3571 struct folio **foliop,
3572 void **fsdata);
3573extern int ext4_try_add_inline_entry(handle_t *handle,
3574 struct ext4_filename *fname,
3575 struct inode *dir, struct inode *inode);
3576extern int ext4_try_create_inline_dir(handle_t *handle,
3577 struct inode *parent,
3578 struct inode *inode);
3579extern int ext4_read_inline_dir(struct file *filp,
3580 struct dir_context *ctx,
3581 int *has_inline_data);
3582extern int ext4_inlinedir_to_tree(struct file *dir_file,
3583 struct inode *dir, ext4_lblk_t block,
3584 struct dx_hash_info *hinfo,
3585 __u32 start_hash, __u32 start_minor_hash,
3586 int *has_inline_data);
3587extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3588 struct ext4_filename *fname,
3589 struct ext4_dir_entry_2 **res_dir,
3590 int *has_inline_data);
3591extern int ext4_delete_inline_entry(handle_t *handle,
3592 struct inode *dir,
3593 struct ext4_dir_entry_2 *de_del,
3594 struct buffer_head *bh,
3595 int *has_inline_data);
3596extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3597extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3598 struct ext4_dir_entry_2 **parent_de,
3599 int *retval);
3600extern void *ext4_read_inline_link(struct inode *inode);
3601
3602struct iomap;
3603extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3604
3605extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3606
3607extern int ext4_convert_inline_data(struct inode *inode);
3608
3609static inline int ext4_has_inline_data(struct inode *inode)
3610{
3611 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3612 EXT4_I(inode)->i_inline_off;
3613}
3614
3615/* namei.c */
3616extern const struct inode_operations ext4_dir_inode_operations;
3617extern const struct inode_operations ext4_special_inode_operations;
3618extern struct dentry *ext4_get_parent(struct dentry *child);
3619extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3620 struct ext4_dir_entry_2 *de,
3621 int blocksize, int csum_size,
3622 unsigned int parent_ino, int dotdot_real_len);
3623extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3624 unsigned int blocksize);
3625extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3626 struct buffer_head *bh);
3627extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3628 struct inode *inode, struct dentry *dentry);
3629extern int __ext4_link(struct inode *dir, struct inode *inode,
3630 struct dentry *dentry);
3631
3632#define S_SHIFT 12
3633static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3634 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3635 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3636 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3637 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3638 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3639 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3640 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3641};
3642
3643static inline void ext4_set_de_type(struct super_block *sb,
3644 struct ext4_dir_entry_2 *de,
3645 umode_t mode) {
3646 if (ext4_has_feature_filetype(sb))
3647 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3648}
3649
3650/* readpages.c */
3651extern int ext4_mpage_readpages(struct inode *inode,
3652 struct readahead_control *rac, struct folio *folio);
3653extern int __init ext4_init_post_read_processing(void);
3654extern void ext4_exit_post_read_processing(void);
3655
3656/* symlink.c */
3657extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3658extern const struct inode_operations ext4_symlink_inode_operations;
3659extern const struct inode_operations ext4_fast_symlink_inode_operations;
3660
3661/* sysfs.c */
3662extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3663extern int ext4_register_sysfs(struct super_block *sb);
3664extern void ext4_unregister_sysfs(struct super_block *sb);
3665extern int __init ext4_init_sysfs(void);
3666extern void ext4_exit_sysfs(void);
3667
3668/* block_validity */
3669extern void ext4_release_system_zone(struct super_block *sb);
3670extern int ext4_setup_system_zone(struct super_block *sb);
3671extern int __init ext4_init_system_zone(void);
3672extern void ext4_exit_system_zone(void);
3673extern int ext4_inode_block_valid(struct inode *inode,
3674 ext4_fsblk_t start_blk,
3675 unsigned int count);
3676extern int ext4_check_blockref(const char *, unsigned int,
3677 struct inode *, __le32 *, unsigned int);
3678extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3679 ext4_fsblk_t start_blk, unsigned int count);
3680
3681
3682/* extents.c */
3683struct ext4_ext_path;
3684struct ext4_extent;
3685
3686/*
3687 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3688 * __le32.
3689 */
3690#define EXT_MAX_BLOCKS 0xffffffff
3691
3692extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3693extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3694extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3695 struct ext4_map_blocks *map, int flags);
3696extern int ext4_ext_truncate(handle_t *, struct inode *);
3697extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3698 ext4_lblk_t end);
3699extern void ext4_ext_init(struct super_block *);
3700extern void ext4_ext_release(struct super_block *);
3701extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3702 loff_t len);
3703extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3704 loff_t offset, ssize_t len);
3705extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3706 ext4_io_end_t *io_end);
3707extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3708 struct ext4_map_blocks *map, int flags);
3709extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3710 int num,
3711 struct ext4_ext_path *path);
3712extern struct ext4_ext_path *ext4_ext_insert_extent(
3713 handle_t *handle, struct inode *inode,
3714 struct ext4_ext_path *path,
3715 struct ext4_extent *newext, int gb_flags);
3716extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3717 struct ext4_ext_path *,
3718 int flags);
3719extern void ext4_free_ext_path(struct ext4_ext_path *);
3720extern int ext4_ext_check_inode(struct inode *inode);
3721extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3722extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3723 __u64 start, __u64 len);
3724extern int ext4_get_es_cache(struct inode *inode,
3725 struct fiemap_extent_info *fieinfo,
3726 __u64 start, __u64 len);
3727extern int ext4_ext_precache(struct inode *inode);
3728extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3729 struct inode *inode2, ext4_lblk_t lblk1,
3730 ext4_lblk_t lblk2, ext4_lblk_t count,
3731 int mark_unwritten,int *err);
3732extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3733extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3734 int check_cred, int restart_cred,
3735 int revoke_cred);
3736extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3737extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3738extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3739 int len, int unwritten, ext4_fsblk_t pblk);
3740extern int ext4_ext_clear_bb(struct inode *inode);
3741
3742
3743/* move_extent.c */
3744extern void ext4_double_down_write_data_sem(struct inode *first,
3745 struct inode *second);
3746extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3747 struct inode *donor_inode);
3748extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3749 __u64 start_orig, __u64 start_donor,
3750 __u64 len, __u64 *moved_len);
3751
3752/* page-io.c */
3753extern int __init ext4_init_pageio(void);
3754extern void ext4_exit_pageio(void);
3755extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3756extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3757extern int ext4_put_io_end(ext4_io_end_t *io_end);
3758extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3759extern void ext4_io_submit_init(struct ext4_io_submit *io,
3760 struct writeback_control *wbc);
3761extern void ext4_end_io_rsv_work(struct work_struct *work);
3762extern void ext4_io_submit(struct ext4_io_submit *io);
3763int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
3764 size_t len);
3765extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3766extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3767
3768/* mmp.c */
3769extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3770
3771/* mmp.c */
3772extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3773
3774/* verity.c */
3775extern const struct fsverity_operations ext4_verityops;
3776
3777/* orphan.c */
3778extern int ext4_orphan_add(handle_t *, struct inode *);
3779extern int ext4_orphan_del(handle_t *, struct inode *);
3780extern void ext4_orphan_cleanup(struct super_block *sb,
3781 struct ext4_super_block *es);
3782extern void ext4_release_orphan_info(struct super_block *sb);
3783extern int ext4_init_orphan_info(struct super_block *sb);
3784extern int ext4_orphan_file_empty(struct super_block *sb);
3785extern void ext4_orphan_file_block_trigger(
3786 struct jbd2_buffer_trigger_type *triggers,
3787 struct buffer_head *bh,
3788 void *data, size_t size);
3789
3790/*
3791 * Add new method to test whether block and inode bitmaps are properly
3792 * initialized. With uninit_bg reading the block from disk is not enough
3793 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3794 */
3795#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3796
3797static inline int bitmap_uptodate(struct buffer_head *bh)
3798{
3799 return (buffer_uptodate(bh) &&
3800 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3801}
3802static inline void set_bitmap_uptodate(struct buffer_head *bh)
3803{
3804 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3805}
3806
3807/* For ioend & aio unwritten conversion wait queues */
3808#define EXT4_WQ_HASH_SZ 37
3809#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3810 EXT4_WQ_HASH_SZ])
3811extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3812
3813extern int ext4_resize_begin(struct super_block *sb);
3814extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3815
3816static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3817 struct ext4_io_end *io_end)
3818{
3819 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3820 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3821 atomic_inc(&EXT4_I(inode)->i_unwritten);
3822 }
3823}
3824
3825static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3826{
3827 struct inode *inode = io_end->inode;
3828
3829 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3830 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3831 /* Wake up anyone waiting on unwritten extent conversion */
3832 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3833 wake_up_all(ext4_ioend_wq(inode));
3834 }
3835}
3836
3837extern const struct iomap_ops ext4_iomap_ops;
3838extern const struct iomap_ops ext4_iomap_overwrite_ops;
3839extern const struct iomap_ops ext4_iomap_report_ops;
3840
3841static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3842{
3843 /*
3844 * If the buffer has the write error flag, we have failed
3845 * to write out data in the block. In this case, we don't
3846 * have to read the block because we may read the old data
3847 * successfully.
3848 */
3849 if (buffer_write_io_error(bh))
3850 set_buffer_uptodate(bh);
3851 return buffer_uptodate(bh);
3852}
3853
3854static inline bool ext4_inode_can_atomic_write(struct inode *inode)
3855{
3856
3857 return S_ISREG(inode->i_mode) && EXT4_SB(inode->i_sb)->s_awu_min > 0;
3858}
3859
3860extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,
3861 loff_t pos, unsigned len,
3862 get_block_t *get_block);
3863#endif /* __KERNEL__ */
3864
3865#define EFSBADCRC EBADMSG /* Bad CRC detected */
3866#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3867
3868#endif /* _EXT4_H */