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 <linux/crc32c.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) \
104 do { \
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 */
114 typedef int ext4_grpblk_t;
115
116 /* data type for filesystem-wide blocks number */
117 typedef unsigned long long ext4_fsblk_t;
118
119 /* data type for file logical block number */
120 typedef __u32 ext4_lblk_t;
121
122 /* data type for block group number */
123 typedef unsigned int ext4_group_t;
124
125 enum 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 */
137 enum 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 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 /* first blocks in the file */
189 #define EXT4_MB_HINT_FIRST 0x0008
190 /* data is being allocated */
191 #define EXT4_MB_HINT_DATA 0x0020
192 /* don't preallocate (for tails) */
193 #define EXT4_MB_HINT_NOPREALLOC 0x0040
194 /* allocate for locality group */
195 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
196 /* allocate goal blocks or none */
197 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
198 /* goal is meaningful */
199 #define EXT4_MB_HINT_TRY_GOAL 0x0200
200 /* blocks already pre-reserved by delayed allocation */
201 #define EXT4_MB_DELALLOC_RESERVED 0x0400
202 /* We are doing stream allocation */
203 #define EXT4_MB_STREAM_ALLOC 0x0800
204 /* Use reserved root blocks if needed */
205 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
206 /* Use blocks from reserved pool */
207 #define EXT4_MB_USE_RESERVED 0x2000
208 /* Do strict check for free blocks while retrying block allocation */
209 #define EXT4_MB_STRICT_CHECK 0x4000
210
211 struct ext4_allocation_request {
212 /* target inode for block we're allocating */
213 struct inode *inode;
214 /* how many blocks we want to allocate */
215 unsigned int len;
216 /* logical block in target inode */
217 ext4_lblk_t logical;
218 /* the closest logical allocated block to the left */
219 ext4_lblk_t lleft;
220 /* the closest logical allocated block to the right */
221 ext4_lblk_t lright;
222 /* phys. target (a hint) */
223 ext4_fsblk_t goal;
224 /* phys. block for the closest logical allocated block to the left */
225 ext4_fsblk_t pleft;
226 /* phys. block for the closest logical allocated block to the right */
227 ext4_fsblk_t pright;
228 /* flags. see above EXT4_MB_HINT_* */
229 unsigned int flags;
230 };
231
232 /*
233 * Logical to physical block mapping, used by ext4_map_blocks()
234 *
235 * This structure is used to pass requests into ext4_map_blocks() as
236 * well as to store the information returned by ext4_map_blocks(). It
237 * takes less room on the stack than a struct buffer_head.
238 */
239 #define EXT4_MAP_NEW BIT(BH_New)
240 #define EXT4_MAP_MAPPED BIT(BH_Mapped)
241 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
242 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
243 #define EXT4_MAP_DELAYED BIT(BH_Delay)
244 /*
245 * This is for use in ext4_map_query_blocks() for a special case where we can
246 * have a physically and logically contiguous blocks split across two leaf
247 * nodes instead of a single extent. This is required in case of atomic writes
248 * to know whether the returned extent is last in leaf. If yes, then lookup for
249 * next in leaf block in ext4_map_query_blocks_next_in_leaf().
250 * - This is never going to be added to any buffer head state.
251 * - We use the next available bit after BH_BITMAP_UPTODATE.
252 */
253 #define EXT4_MAP_QUERY_LAST_IN_LEAF BIT(BH_BITMAP_UPTODATE + 1)
254 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
255 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
256 EXT4_MAP_DELAYED | EXT4_MAP_QUERY_LAST_IN_LEAF)
257
258 struct ext4_map_blocks {
259 ext4_fsblk_t m_pblk;
260 ext4_lblk_t m_lblk;
261 unsigned int m_len;
262 unsigned int m_flags;
263 };
264
265 /*
266 * Block validity checking, system zone rbtree.
267 */
268 struct ext4_system_blocks {
269 struct rb_root root;
270 struct rcu_head rcu;
271 };
272
273 /*
274 * Flags for ext4_io_end->flags
275 */
276 #define EXT4_IO_END_UNWRITTEN 0x0001
277 #define EXT4_IO_END_FAILED 0x0002
278
279 #define EXT4_IO_END_DEFER_COMPLETION (EXT4_IO_END_UNWRITTEN | EXT4_IO_END_FAILED)
280
281 struct ext4_io_end_vec {
282 struct list_head list; /* list of io_end_vec */
283 loff_t offset; /* offset in the file */
284 ssize_t size; /* size of the extent */
285 };
286
287 /*
288 * For converting unwritten extents on a work queue. 'handle' is used for
289 * buffered writeback.
290 */
291 typedef struct ext4_io_end {
292 struct list_head list; /* per-file finished IO list */
293 handle_t *handle; /* handle reserved for extent
294 * conversion */
295 struct inode *inode; /* file being written to */
296 struct bio *bio; /* Linked list of completed
297 * bios covering the extent */
298 unsigned int flag; /* unwritten or not */
299 refcount_t count; /* reference counter */
300 struct list_head list_vec; /* list of ext4_io_end_vec */
301 } ext4_io_end_t;
302
303 struct ext4_io_submit {
304 struct writeback_control *io_wbc;
305 struct bio *io_bio;
306 ext4_io_end_t *io_end;
307 sector_t io_next_block;
308 };
309
310 /*
311 * Special inodes numbers
312 */
313 #define EXT4_BAD_INO 1 /* Bad blocks inode */
314 #define EXT4_ROOT_INO 2 /* Root inode */
315 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
316 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
317 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
318 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
319 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
320 #define EXT4_JOURNAL_INO 8 /* Journal inode */
321
322 /* First non-reserved inode for old ext4 filesystems */
323 #define EXT4_GOOD_OLD_FIRST_INO 11
324
325 /*
326 * Maximal count of links to a file
327 */
328 #define EXT4_LINK_MAX 65000
329
330 /*
331 * Macro-instructions used to manage several block sizes
332 */
333 #define EXT4_MIN_BLOCK_SIZE 1024
334 #define EXT4_MAX_BLOCK_SIZE 65536
335 #define EXT4_MIN_BLOCK_LOG_SIZE 10
336 #define EXT4_MAX_BLOCK_LOG_SIZE 16
337 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
338 #ifdef __KERNEL__
339 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
340 #else
341 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
342 #endif
343 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
344 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
345 EXT4_SB(s)->s_cluster_bits)
346 #ifdef __KERNEL__
347 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
348 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
349 #else
350 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
351 #endif
352 #ifdef __KERNEL__
353 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
354 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
355 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
356 #else
357 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
358 EXT4_GOOD_OLD_INODE_SIZE : \
359 (s)->s_inode_size)
360 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
361 EXT4_GOOD_OLD_FIRST_INO : \
362 (s)->s_first_ino)
363 #endif
364 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
365 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
366 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
367 blkbits))
368 #define EXT4_B_TO_LBLK(inode, offset) \
369 (round_up((offset), i_blocksize(inode)) >> (inode)->i_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 */
395 struct 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
433 struct 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. */
ext4_mask_flags(umode_t mode,__u32 flags)560 static 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 */
573 enum {
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
ext4_check_flag_values(void)622 static 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)
653 struct 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 */
665 struct 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 */
677 enum {
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 /* Eventual metadata allocation (due to growing extent tree)
705 * should not fail, so try to use reserved blocks for that.*/
706 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
707 /* Don't normalize allocation size (used for fallocate) */
708 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
709 /* Convert written extents to unwritten */
710 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
711 /* Write zeros to newly created written extents */
712 #define EXT4_GET_BLOCKS_ZERO 0x0200
713 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
714 EXT4_GET_BLOCKS_ZERO)
715 /* Caller is in the context of data submission, such as writeback,
716 * fsync, etc. Especially, in the generic writeback path, caller will
717 * submit data before dropping transaction handle. This allows jbd2
718 * to avoid submitting data before commit. */
719 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
720 /* Convert extent to initialized after IO complete */
721 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT |\
722 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |\
723 EXT4_GET_BLOCKS_IO_SUBMIT)
724 /* Caller is in the atomic contex, find extent if it has been cached */
725 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
726 /*
727 * Atomic write caller needs this to query in the slow path of mixed mapping
728 * case, when a contiguous extent can be split across two adjacent leaf nodes.
729 * Look EXT4_MAP_QUERY_LAST_IN_LEAF.
730 */
731 #define EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF 0x1000
732
733 /*
734 * The bit position of these flags must not overlap with any of the
735 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
736 * read_extent_tree_block(), ext4_split_extent_at(),
737 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
738 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
739 * caching the extents when reading from the extent tree while a
740 * truncate or punch hole operation is in progress.
741 */
742 #define EXT4_EX_NOCACHE 0x40000000
743 #define EXT4_EX_FORCE_CACHE 0x20000000
744 #define EXT4_EX_NOFAIL 0x10000000
745 /*
746 * ext4_map_query_blocks() uses this filter mask to filter the flags needed to
747 * pass while lookup/querying of on disk extent tree.
748 */
749 #define EXT4_EX_QUERY_FILTER (EXT4_EX_NOCACHE | EXT4_EX_FORCE_CACHE |\
750 EXT4_EX_NOFAIL |\
751 EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF)
752
753 /*
754 * Flags used by ext4_free_blocks
755 */
756 #define EXT4_FREE_BLOCKS_METADATA 0x0001
757 #define EXT4_FREE_BLOCKS_FORGET 0x0002
758 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
759 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
760 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
761 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
762 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
763
764 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
765 /*
766 * ioctl commands in 32 bit emulation
767 */
768 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
769 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
770 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
771 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
772 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
773 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
774 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
775 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
776 #endif
777
778 /* Max physical block we can address w/o extents */
779 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
780
781 /* Max logical block we can support */
782 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
783
784 /*
785 * Structure of an inode on the disk
786 */
787 struct ext4_inode {
788 __le16 i_mode; /* File mode */
789 __le16 i_uid; /* Low 16 bits of Owner Uid */
790 __le32 i_size_lo; /* Size in bytes */
791 __le32 i_atime; /* Access time */
792 __le32 i_ctime; /* Inode Change time */
793 __le32 i_mtime; /* Modification time */
794 __le32 i_dtime; /* Deletion Time */
795 __le16 i_gid; /* Low 16 bits of Group Id */
796 __le16 i_links_count; /* Links count */
797 __le32 i_blocks_lo; /* Blocks count */
798 __le32 i_flags; /* File flags */
799 union {
800 struct {
801 __le32 l_i_version;
802 } linux1;
803 struct {
804 __u32 h_i_translator;
805 } hurd1;
806 struct {
807 __u32 m_i_reserved1;
808 } masix1;
809 } osd1; /* OS dependent 1 */
810 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
811 __le32 i_generation; /* File version (for NFS) */
812 __le32 i_file_acl_lo; /* File ACL */
813 __le32 i_size_high;
814 __le32 i_obso_faddr; /* Obsoleted fragment address */
815 union {
816 struct {
817 __le16 l_i_blocks_high; /* were l_i_reserved1 */
818 __le16 l_i_file_acl_high;
819 __le16 l_i_uid_high; /* these 2 fields */
820 __le16 l_i_gid_high; /* were reserved2[0] */
821 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
822 __le16 l_i_reserved;
823 } linux2;
824 struct {
825 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
826 __u16 h_i_mode_high;
827 __u16 h_i_uid_high;
828 __u16 h_i_gid_high;
829 __u32 h_i_author;
830 } hurd2;
831 struct {
832 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
833 __le16 m_i_file_acl_high;
834 __u32 m_i_reserved2[2];
835 } masix2;
836 } osd2; /* OS dependent 2 */
837 __le16 i_extra_isize;
838 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
839 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
840 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
841 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
842 __le32 i_crtime; /* File Creation time */
843 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
844 __le32 i_version_hi; /* high 32 bits for 64-bit version */
845 __le32 i_projid; /* Project ID */
846 };
847
848 #define EXT4_EPOCH_BITS 2
849 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
850 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
851
852 /*
853 * Extended fields will fit into an inode if the filesystem was formatted
854 * with large inodes (-I 256 or larger) and there are not currently any EAs
855 * consuming all of the available space. For new inodes we always reserve
856 * enough space for the kernel's known extended fields, but for inodes
857 * created with an old kernel this might not have been the case. None of
858 * the extended inode fields is critical for correct filesystem operation.
859 * This macro checks if a certain field fits in the inode. Note that
860 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
861 */
862 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
863 ((offsetof(typeof(*ext4_inode), field) + \
864 sizeof((ext4_inode)->field)) \
865 <= (EXT4_GOOD_OLD_INODE_SIZE + \
866 (einode)->i_extra_isize)) \
867
868 /*
869 * We use an encoding that preserves the times for extra epoch "00":
870 *
871 * extra msb of adjust for signed
872 * epoch 32-bit 32-bit tv_sec to
873 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
874 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
875 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
876 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
877 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
878 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
879 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
880 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
881 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
882 *
883 * Note that previous versions of the kernel on 64-bit systems would
884 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
885 * 1970. e2fsck will correct this, assuming that it is run on the
886 * affected filesystem before 2242.
887 */
888
ext4_encode_extra_time(struct timespec64 ts)889 static inline __le32 ext4_encode_extra_time(struct timespec64 ts)
890 {
891 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK;
892 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS));
893 }
894
ext4_decode_extra_time(__le32 base,__le32 extra)895 static inline struct timespec64 ext4_decode_extra_time(__le32 base,
896 __le32 extra)
897 {
898 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) };
899
900 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
901 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
902 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
903 return ts;
904 }
905
906 #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \
907 do { \
908 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
909 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \
910 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \
911 } else \
912 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \
913 } while (0)
914
915 #define EXT4_INODE_SET_ATIME(inode, raw_inode) \
916 EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode))
917
918 #define EXT4_INODE_SET_MTIME(inode, raw_inode) \
919 EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode))
920
921 #define EXT4_INODE_SET_CTIME(inode, raw_inode) \
922 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode))
923
924 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
925 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
926 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \
927 raw_inode, (einode)->xtime)
928
929 #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \
930 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \
931 ext4_decode_extra_time((raw_inode)->xtime, \
932 (raw_inode)->xtime ## _extra) : \
933 (struct timespec64) { \
934 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \
935 })
936
937 #define EXT4_INODE_GET_ATIME(inode, raw_inode) \
938 do { \
939 inode_set_atime_to_ts(inode, \
940 EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \
941 } while (0)
942
943 #define EXT4_INODE_GET_MTIME(inode, raw_inode) \
944 do { \
945 inode_set_mtime_to_ts(inode, \
946 EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \
947 } while (0)
948
949 #define EXT4_INODE_GET_CTIME(inode, raw_inode) \
950 do { \
951 inode_set_ctime_to_ts(inode, \
952 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \
953 } while (0)
954
955 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
956 do { \
957 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
958 (einode)->xtime = \
959 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \
960 raw_inode); \
961 else \
962 (einode)->xtime = (struct timespec64){0, 0}; \
963 } while (0)
964
965 #define i_disk_version osd1.linux1.l_i_version
966
967 #if defined(__KERNEL__) || defined(__linux__)
968 #define i_reserved1 osd1.linux1.l_i_reserved1
969 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
970 #define i_blocks_high osd2.linux2.l_i_blocks_high
971 #define i_uid_low i_uid
972 #define i_gid_low i_gid
973 #define i_uid_high osd2.linux2.l_i_uid_high
974 #define i_gid_high osd2.linux2.l_i_gid_high
975 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
976
977 #elif defined(__GNU__)
978
979 #define i_translator osd1.hurd1.h_i_translator
980 #define i_uid_high osd2.hurd2.h_i_uid_high
981 #define i_gid_high osd2.hurd2.h_i_gid_high
982 #define i_author osd2.hurd2.h_i_author
983
984 #elif defined(__masix__)
985
986 #define i_reserved1 osd1.masix1.m_i_reserved1
987 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
988 #define i_reserved2 osd2.masix2.m_i_reserved2
989
990 #endif /* defined(__KERNEL__) || defined(__linux__) */
991
992 #include "extents_status.h"
993 #include "fast_commit.h"
994
995 /*
996 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
997 *
998 * These are needed to avoid lockdep false positives when we need to
999 * allocate blocks to the quota inode during ext4_map_blocks(), while
1000 * holding i_data_sem for a normal (non-quota) inode. Since we don't
1001 * do quota tracking for the quota inode, this avoids deadlock (as
1002 * well as infinite recursion, since it isn't turtles all the way
1003 * down...)
1004 *
1005 * I_DATA_SEM_NORMAL - Used for most inodes
1006 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
1007 * where the second inode has larger inode number
1008 * than the first
1009 * I_DATA_SEM_QUOTA - Used for quota inodes only
1010 * I_DATA_SEM_EA - Used for ea_inodes only
1011 */
1012 enum {
1013 I_DATA_SEM_NORMAL = 0,
1014 I_DATA_SEM_OTHER,
1015 I_DATA_SEM_QUOTA,
1016 I_DATA_SEM_EA
1017 };
1018
1019
1020 /*
1021 * fourth extended file system inode data in memory
1022 */
1023 struct ext4_inode_info {
1024 __le32 i_data[15]; /* unconverted */
1025 __u32 i_dtime;
1026 ext4_fsblk_t i_file_acl;
1027
1028 /*
1029 * i_block_group is the number of the block group which contains
1030 * this file's inode. Constant across the lifetime of the inode,
1031 * it is used for making block allocation decisions - we try to
1032 * place a file's data blocks near its inode block, and new inodes
1033 * near to their parent directory's inode.
1034 */
1035 ext4_group_t i_block_group;
1036 ext4_lblk_t i_dir_start_lookup;
1037 #if (BITS_PER_LONG < 64)
1038 unsigned long i_state_flags; /* Dynamic state flags */
1039 #endif
1040 unsigned long i_flags;
1041
1042 /*
1043 * Extended attributes can be read independently of the main file
1044 * data. Taking i_rwsem even when reading would cause contention
1045 * between readers of EAs and writers of regular file data, so
1046 * instead we synchronize on xattr_sem when reading or changing
1047 * EAs.
1048 */
1049 struct rw_semaphore xattr_sem;
1050
1051 /*
1052 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1053 * i_orphan is used.
1054 */
1055 union {
1056 struct list_head i_orphan; /* unlinked but open inodes */
1057 unsigned int i_orphan_idx; /* Index in orphan file */
1058 };
1059
1060 /* Fast commit related info */
1061
1062 /* For tracking dentry create updates */
1063 struct list_head i_fc_dilist;
1064 struct list_head i_fc_list; /*
1065 * inodes that need fast commit
1066 * protected by sbi->s_fc_lock.
1067 */
1068
1069 /* Start of lblk range that needs to be committed in this fast commit */
1070 ext4_lblk_t i_fc_lblk_start;
1071
1072 /* End of lblk range that needs to be committed in this fast commit */
1073 ext4_lblk_t i_fc_lblk_len;
1074
1075 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1076
1077 /* Fast commit wait queue for this inode */
1078 wait_queue_head_t i_fc_wait;
1079
1080 /*
1081 * Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len
1082 * and inode's EXT4_FC_STATE_COMMITTING state bit.
1083 */
1084 spinlock_t i_fc_lock;
1085
1086 /*
1087 * i_disksize keeps track of what the inode size is ON DISK, not
1088 * in memory. During truncate, i_size is set to the new size by
1089 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1090 * set i_disksize to 0 until the truncate is actually under way.
1091 *
1092 * The intent is that i_disksize always represents the blocks which
1093 * are used by this file. This allows recovery to restart truncate
1094 * on orphans if we crash during truncate. We actually write i_disksize
1095 * into the on-disk inode when writing inodes out, instead of i_size.
1096 *
1097 * The only time when i_disksize and i_size may be different is when
1098 * a truncate is in progress. The only things which change i_disksize
1099 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1100 */
1101 loff_t i_disksize;
1102
1103 /*
1104 * i_data_sem is for serialising ext4_truncate() against
1105 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1106 * data tree are chopped off during truncate. We can't do that in
1107 * ext4 because whenever we perform intermediate commits during
1108 * truncate, the inode and all the metadata blocks *must* be in a
1109 * consistent state which allows truncation of the orphans to restart
1110 * during recovery. Hence we must fix the get_block-vs-truncate race
1111 * by other means, so we have i_data_sem.
1112 */
1113 struct rw_semaphore i_data_sem;
1114 struct inode vfs_inode;
1115 struct jbd2_inode *jinode;
1116
1117 /*
1118 * File creation time. Its function is same as that of
1119 * struct timespec64 i_{a,c,m}time in the generic inode.
1120 */
1121 struct timespec64 i_crtime;
1122
1123 /* mballoc */
1124 atomic_t i_prealloc_active;
1125
1126 /* allocation reservation info for delalloc */
1127 /* In case of bigalloc, this refer to clusters rather than blocks */
1128 unsigned int i_reserved_data_blocks;
1129 struct rb_root i_prealloc_node;
1130 rwlock_t i_prealloc_lock;
1131
1132 /* extents status tree */
1133 struct ext4_es_tree i_es_tree;
1134 rwlock_t i_es_lock;
1135 struct list_head i_es_list;
1136 unsigned int i_es_all_nr; /* protected by i_es_lock */
1137 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1138 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1139 extents to shrink. Protected by
1140 i_es_lock */
1141
1142 /* ialloc */
1143 ext4_group_t i_last_alloc_group;
1144
1145 /* pending cluster reservations for bigalloc file systems */
1146 struct ext4_pending_tree i_pending_tree;
1147
1148 /* on-disk additional length */
1149 __u16 i_extra_isize;
1150
1151 /* Indicate the inline data space. */
1152 u16 i_inline_off;
1153 u16 i_inline_size;
1154
1155 #ifdef CONFIG_QUOTA
1156 /* quota space reservation, managed internally by quota code */
1157 qsize_t i_reserved_quota;
1158 #endif
1159 spinlock_t i_block_reservation_lock;
1160
1161 /* Lock protecting lists below */
1162 spinlock_t i_completed_io_lock;
1163 /*
1164 * Completed IOs that need unwritten extents handling and have
1165 * transaction reserved
1166 */
1167 struct list_head i_rsv_conversion_list;
1168 struct work_struct i_rsv_conversion_work;
1169
1170 /*
1171 * Transactions that contain inode's metadata needed to complete
1172 * fsync and fdatasync, respectively.
1173 */
1174 tid_t i_sync_tid;
1175 tid_t i_datasync_tid;
1176
1177 #ifdef CONFIG_QUOTA
1178 struct dquot __rcu *i_dquot[MAXQUOTAS];
1179 #endif
1180
1181 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1182 __u32 i_csum_seed;
1183
1184 kprojid_t i_projid;
1185 };
1186
1187 /*
1188 * File system states
1189 */
1190 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1191 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1192 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1193 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1194
1195 /*
1196 * Misc. filesystem flags
1197 */
1198 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1199 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1200 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1201
1202 /*
1203 * Mount flags set via mount options or defaults
1204 */
1205 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1206 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1207 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1208 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1209 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1210 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1211 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1212 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1213 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1214 #ifdef CONFIG_FS_DAX
1215 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1216 #else
1217 #define EXT4_MOUNT_DAX_ALWAYS 0
1218 #endif
1219 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1220 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1221 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1222 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1223 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1224 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1225 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1226 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1227 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1228 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1229 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1230 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1231 * enable enforcement for hidden
1232 * quota files */
1233 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1234 * enforcement for hidden quota
1235 * files */
1236 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1237 * enforcement */
1238 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1239 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1240 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1241 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1242 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1243 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1244 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1245 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1246 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1247 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1248
1249 /*
1250 * Mount flags set either automatically (could not be set by mount option)
1251 * based on per file system feature or property or in special cases such as
1252 * distinguishing between explicit mount option definition and default.
1253 */
1254 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1255 specified delalloc */
1256 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1257 size of blocksize * 8
1258 blocks */
1259 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1260 file systems */
1261 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1262 specified journal checksum */
1263
1264 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1265 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1266 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1267 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1268 * scanning in mballoc
1269 */
1270 #define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */
1271
1272 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1273 ~EXT4_MOUNT_##opt
1274 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1275 EXT4_MOUNT_##opt
1276 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1277 EXT4_MOUNT_##opt)
1278
1279 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1280 ~EXT4_MOUNT2_##opt
1281 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1282 EXT4_MOUNT2_##opt
1283 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1284 EXT4_MOUNT2_##opt)
1285
1286 #define ext4_test_and_set_bit __test_and_set_bit_le
1287 #define ext4_set_bit __set_bit_le
1288 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1289 #define ext4_clear_bit __clear_bit_le
1290 #define ext4_test_bit test_bit_le
1291 #define ext4_find_next_zero_bit find_next_zero_bit_le
1292 #define ext4_find_next_bit find_next_bit_le
1293
1294 extern void mb_set_bits(void *bm, int cur, int len);
1295
1296 /*
1297 * Maximal mount counts between two filesystem checks
1298 */
1299 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1300 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1301
1302 /*
1303 * Behaviour when detecting errors
1304 */
1305 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1306 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1307 #define EXT4_ERRORS_PANIC 3 /* Panic */
1308 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1309
1310 /* Metadata checksum algorithm codes */
1311 #define EXT4_CRC32C_CHKSUM 1
1312
1313 #define EXT4_LABEL_MAX 16
1314
1315 /*
1316 * Structure of the super block
1317 */
1318 struct ext4_super_block {
1319 /*00*/ __le32 s_inodes_count; /* Inodes count */
1320 __le32 s_blocks_count_lo; /* Blocks count */
1321 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1322 __le32 s_free_blocks_count_lo; /* Free blocks count */
1323 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1324 __le32 s_first_data_block; /* First Data Block */
1325 __le32 s_log_block_size; /* Block size */
1326 __le32 s_log_cluster_size; /* Allocation cluster size */
1327 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1328 __le32 s_clusters_per_group; /* # Clusters per group */
1329 __le32 s_inodes_per_group; /* # Inodes per group */
1330 __le32 s_mtime; /* Mount time */
1331 /*30*/ __le32 s_wtime; /* Write time */
1332 __le16 s_mnt_count; /* Mount count */
1333 __le16 s_max_mnt_count; /* Maximal mount count */
1334 __le16 s_magic; /* Magic signature */
1335 __le16 s_state; /* File system state */
1336 __le16 s_errors; /* Behaviour when detecting errors */
1337 __le16 s_minor_rev_level; /* minor revision level */
1338 /*40*/ __le32 s_lastcheck; /* time of last check */
1339 __le32 s_checkinterval; /* max. time between checks */
1340 __le32 s_creator_os; /* OS */
1341 __le32 s_rev_level; /* Revision level */
1342 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1343 __le16 s_def_resgid; /* Default gid for reserved blocks */
1344 /*
1345 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1346 *
1347 * Note: the difference between the compatible feature set and
1348 * the incompatible feature set is that if there is a bit set
1349 * in the incompatible feature set that the kernel doesn't
1350 * know about, it should refuse to mount the filesystem.
1351 *
1352 * e2fsck's requirements are more strict; if it doesn't know
1353 * about a feature in either the compatible or incompatible
1354 * feature set, it must abort and not try to meddle with
1355 * things it doesn't understand...
1356 */
1357 __le32 s_first_ino; /* First non-reserved inode */
1358 __le16 s_inode_size; /* size of inode structure */
1359 __le16 s_block_group_nr; /* block group # of this superblock */
1360 __le32 s_feature_compat; /* compatible feature set */
1361 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1362 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1363 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1364 /*78*/ char s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */
1365 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1366 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1367 /*
1368 * Performance hints. Directory preallocation should only
1369 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1370 */
1371 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1372 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1373 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1374 /*
1375 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1376 */
1377 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1378 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1379 __le32 s_journal_dev; /* device number of journal file */
1380 __le32 s_last_orphan; /* start of list of inodes to delete */
1381 __le32 s_hash_seed[4]; /* HTREE hash seed */
1382 __u8 s_def_hash_version; /* Default hash version to use */
1383 __u8 s_jnl_backup_type;
1384 __le16 s_desc_size; /* size of group descriptor */
1385 /*100*/ __le32 s_default_mount_opts;
1386 __le32 s_first_meta_bg; /* First metablock block group */
1387 __le32 s_mkfs_time; /* When the filesystem was created */
1388 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1389 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */
1390 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1391 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1392 __le32 s_free_blocks_count_hi; /* Free blocks count */
1393 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1394 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1395 __le32 s_flags; /* Miscellaneous flags */
1396 __le16 s_raid_stride; /* RAID stride */
1397 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1398 __le64 s_mmp_block; /* Block for multi-mount protection */
1399 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1400 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1401 __u8 s_checksum_type; /* metadata checksum algorithm used */
1402 __u8 s_encryption_level; /* versioning level for encryption */
1403 __u8 s_reserved_pad; /* Padding to next 32bits */
1404 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1405 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1406 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1407 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1408 snapshot's future use */
1409 __le32 s_snapshot_list; /* inode number of the head of the
1410 on-disk snapshot list */
1411 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1412 __le32 s_error_count; /* number of fs errors */
1413 __le32 s_first_error_time; /* first time an error happened */
1414 __le32 s_first_error_ino; /* inode involved in first error */
1415 __le64 s_first_error_block; /* block involved of first error */
1416 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1417 __le32 s_first_error_line; /* line number where error happened */
1418 __le32 s_last_error_time; /* most recent time of an error */
1419 __le32 s_last_error_ino; /* inode involved in last error */
1420 __le32 s_last_error_line; /* line number where error happened */
1421 __le64 s_last_error_block; /* block involved of last error */
1422 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1423 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1424 __u8 s_mount_opts[64];
1425 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1426 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1427 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1428 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1429 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1430 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1431 __le32 s_lpf_ino; /* Location of the lost+found inode */
1432 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1433 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1434 __u8 s_wtime_hi;
1435 __u8 s_mtime_hi;
1436 __u8 s_mkfs_time_hi;
1437 __u8 s_lastcheck_hi;
1438 __u8 s_first_error_time_hi;
1439 __u8 s_last_error_time_hi;
1440 __u8 s_first_error_errcode;
1441 __u8 s_last_error_errcode;
1442 __le16 s_encoding; /* Filename charset encoding */
1443 __le16 s_encoding_flags; /* Filename charset encoding flags */
1444 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
1445 __le32 s_reserved[94]; /* Padding to the end of the block */
1446 __le32 s_checksum; /* crc32c(superblock) */
1447 };
1448
1449 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1450
1451 #ifdef __KERNEL__
1452
1453 /* Number of quota types we support */
1454 #define EXT4_MAXQUOTAS 3
1455
1456 #define EXT4_ENC_UTF8_12_1 1
1457
1458 /* Types of ext4 journal triggers */
1459 enum ext4_journal_trigger_type {
1460 EXT4_JTR_ORPHAN_FILE,
1461 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
1462 };
1463
1464 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1465
1466 struct ext4_journal_trigger {
1467 struct jbd2_buffer_trigger_type tr_triggers;
1468 struct super_block *sb;
1469 };
1470
EXT4_TRIGGER(struct jbd2_buffer_trigger_type * trigger)1471 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1472 struct jbd2_buffer_trigger_type *trigger)
1473 {
1474 return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1475 }
1476
1477 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1478
1479 /* Structure at the tail of orphan block */
1480 struct ext4_orphan_block_tail {
1481 __le32 ob_magic;
1482 __le32 ob_checksum;
1483 };
1484
ext4_inodes_per_orphan_block(struct super_block * sb)1485 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1486 {
1487 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1488 sizeof(u32);
1489 }
1490
1491 struct ext4_orphan_block {
1492 atomic_t ob_free_entries; /* Number of free orphan entries in block */
1493 struct buffer_head *ob_bh; /* Buffer for orphan block */
1494 };
1495
1496 /*
1497 * Info about orphan file.
1498 */
1499 struct ext4_orphan_info {
1500 int of_blocks; /* Number of orphan blocks in a file */
1501 __u32 of_csum_seed; /* Checksum seed for orphan file */
1502 struct ext4_orphan_block *of_binfo; /* Array with info about orphan
1503 * file blocks */
1504 };
1505
1506 /*
1507 * fourth extended-fs super-block data in memory
1508 */
1509 struct ext4_sb_info {
1510 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1511 unsigned long s_inodes_per_block;/* Number of inodes per block */
1512 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1513 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1514 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1515 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1516 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1517 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1518 ext4_group_t s_groups_count; /* Number of groups in the fs */
1519 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1520 unsigned long s_overhead; /* # of fs overhead clusters */
1521 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1522 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1523 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1524 struct buffer_head * s_sbh; /* Buffer containing the super block */
1525 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1526 /* Array of bh's for the block group descriptors */
1527 struct buffer_head * __rcu *s_group_desc;
1528 unsigned int s_mount_opt;
1529 unsigned int s_mount_opt2;
1530 unsigned long s_mount_flags;
1531 unsigned int s_def_mount_opt;
1532 unsigned int s_def_mount_opt2;
1533 ext4_fsblk_t s_sb_block;
1534 atomic64_t s_resv_clusters;
1535 kuid_t s_resuid;
1536 kgid_t s_resgid;
1537 unsigned short s_mount_state;
1538 unsigned short s_pad;
1539 int s_addr_per_block_bits;
1540 int s_desc_per_block_bits;
1541 int s_inode_size;
1542 int s_first_ino;
1543 unsigned int s_inode_readahead_blks;
1544 unsigned int s_inode_goal;
1545 u32 s_hash_seed[4];
1546 int s_def_hash_version;
1547 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1548 struct percpu_counter s_freeclusters_counter;
1549 struct percpu_counter s_freeinodes_counter;
1550 struct percpu_counter s_dirs_counter;
1551 struct percpu_counter s_dirtyclusters_counter;
1552 struct percpu_counter s_sra_exceeded_retry_limit;
1553 struct blockgroup_lock *s_blockgroup_lock;
1554 struct proc_dir_entry *s_proc;
1555 struct kobject s_kobj;
1556 struct completion s_kobj_unregister;
1557 struct super_block *s_sb;
1558 struct buffer_head *s_mmp_bh;
1559
1560 /* Journaling */
1561 struct journal_s *s_journal;
1562 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1563 struct mutex s_orphan_lock; /* Protects on disk list changes */
1564 struct list_head s_orphan; /* List of orphaned inodes in on disk
1565 list */
1566 struct ext4_orphan_info s_orphan_info;
1567 unsigned long s_commit_interval;
1568 u32 s_max_batch_time;
1569 u32 s_min_batch_time;
1570 struct file *s_journal_bdev_file;
1571 #ifdef CONFIG_QUOTA
1572 /* Names of quota files with journalled quota */
1573 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1574 int s_jquota_fmt; /* Format of quota to use */
1575 #endif
1576 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1577 struct ext4_system_blocks __rcu *s_system_blks;
1578
1579 #ifdef EXTENTS_STATS
1580 /* ext4 extents stats */
1581 unsigned long s_ext_min;
1582 unsigned long s_ext_max;
1583 unsigned long s_depth_max;
1584 spinlock_t s_ext_stats_lock;
1585 unsigned long s_ext_blocks;
1586 unsigned long s_ext_extents;
1587 #endif
1588
1589 /* for buddy allocator */
1590 struct ext4_group_info ** __rcu *s_group_info;
1591 struct inode *s_buddy_cache;
1592 spinlock_t s_md_lock;
1593 unsigned short *s_mb_offsets;
1594 unsigned int *s_mb_maxs;
1595 unsigned int s_group_info_size;
1596 atomic_t s_mb_free_pending;
1597 struct list_head s_freed_data_list[2]; /* List of blocks to be freed
1598 after commit completed */
1599 struct list_head s_discard_list;
1600 struct work_struct s_discard_work;
1601 atomic_t s_retry_alloc_pending;
1602 struct xarray *s_mb_avg_fragment_size;
1603 struct xarray *s_mb_largest_free_orders;
1604
1605 /* tunables */
1606 unsigned long s_stripe;
1607 unsigned int s_mb_max_linear_groups;
1608 unsigned int s_mb_stream_request;
1609 unsigned int s_mb_max_to_scan;
1610 unsigned int s_mb_min_to_scan;
1611 unsigned int s_mb_stats;
1612 unsigned int s_mb_order2_reqs;
1613 unsigned int s_mb_group_prealloc;
1614 unsigned int s_max_dir_size_kb;
1615 unsigned int s_mb_prefetch;
1616 unsigned int s_mb_prefetch_limit;
1617 unsigned int s_mb_best_avail_max_trim_order;
1618 unsigned int s_sb_update_sec;
1619 unsigned int s_sb_update_kb;
1620
1621 /* where last allocation was done - for stream allocation */
1622 ext4_group_t *s_mb_last_groups;
1623 unsigned int s_mb_nr_global_goals;
1624
1625 /* stats for buddy allocator */
1626 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1627 atomic_t s_bal_success; /* we found long enough chunks */
1628 atomic_t s_bal_allocated; /* in blocks */
1629 atomic_t s_bal_ex_scanned; /* total extents scanned */
1630 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */
1631 atomic_t s_bal_groups_scanned; /* number of groups scanned */
1632 atomic_t s_bal_goals; /* goal hits */
1633 atomic_t s_bal_stream_goals; /* stream allocation global goal hits */
1634 atomic_t s_bal_len_goals; /* len goal hits */
1635 atomic_t s_bal_breaks; /* too long searches */
1636 atomic_t s_bal_2orders; /* 2^order hits */
1637 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
1638 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
1639 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */
1640 atomic_t s_mb_buddies_generated; /* number of buddies generated */
1641 atomic64_t s_mb_generation_time;
1642 atomic_t s_mb_lost_chunks;
1643 atomic_t s_mb_preallocated;
1644 atomic_t s_mb_discarded;
1645 atomic_t s_lock_busy;
1646
1647 /* locality groups */
1648 struct ext4_locality_group __percpu *s_locality_groups;
1649
1650 /* for write statistics */
1651 unsigned long s_sectors_written_start;
1652 u64 s_kbytes_written;
1653
1654 /* the size of zero-out chunk */
1655 unsigned int s_extent_max_zeroout_kb;
1656
1657 unsigned int s_log_groups_per_flex;
1658 struct flex_groups * __rcu *s_flex_groups;
1659 ext4_group_t s_flex_groups_allocated;
1660
1661 /* workqueue for reserved extent conversions (buffered io) */
1662 struct workqueue_struct *rsv_conversion_wq;
1663
1664 /* timer for periodic error stats printing */
1665 struct timer_list s_err_report;
1666
1667 /* Lazy inode table initialization info */
1668 struct ext4_li_request *s_li_request;
1669 /* Wait multiplier for lazy initialization thread */
1670 unsigned int s_li_wait_mult;
1671
1672 /* Kernel thread for multiple mount protection */
1673 struct task_struct *s_mmp_tsk;
1674
1675 /* record the last minlen when FITRIM is called. */
1676 unsigned long s_last_trim_minblks;
1677
1678 /* Precomputed FS UUID checksum for seeding other checksums */
1679 __u32 s_csum_seed;
1680
1681 /* Reclaim extents from extent status tree */
1682 struct shrinker *s_es_shrinker;
1683 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1684 long s_es_nr_inode;
1685 struct ext4_es_stats s_es_stats;
1686 struct mb_cache *s_ea_block_cache;
1687 struct mb_cache *s_ea_inode_cache;
1688 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1689
1690 /* Journal triggers for checksum computation */
1691 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1692
1693 /* Ratelimit ext4 messages. */
1694 struct ratelimit_state s_err_ratelimit_state;
1695 struct ratelimit_state s_warning_ratelimit_state;
1696 struct ratelimit_state s_msg_ratelimit_state;
1697 atomic_t s_warning_count;
1698 atomic_t s_msg_count;
1699
1700 /* Encryption policy for '-o test_dummy_encryption' */
1701 struct fscrypt_dummy_policy s_dummy_enc_policy;
1702
1703 /*
1704 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1705 * or EXTENTS flag or between writepages ops and changing DELALLOC or
1706 * DIOREAD_NOLOCK mount options on remount.
1707 */
1708 struct percpu_rw_semaphore s_writepages_rwsem;
1709 struct dax_device *s_daxdev;
1710 u64 s_dax_part_off;
1711 #ifdef CONFIG_EXT4_DEBUG
1712 unsigned long s_simulate_fail;
1713 #endif
1714 /* Record the errseq of the backing block device */
1715 errseq_t s_bdev_wb_err;
1716 spinlock_t s_bdev_wb_lock;
1717
1718 /* Information about errors that happened during this mount */
1719 spinlock_t s_error_lock;
1720 int s_add_error_count;
1721 int s_first_error_code;
1722 __u32 s_first_error_line;
1723 __u32 s_first_error_ino;
1724 __u64 s_first_error_block;
1725 const char *s_first_error_func;
1726 time64_t s_first_error_time;
1727 int s_last_error_code;
1728 __u32 s_last_error_line;
1729 __u32 s_last_error_ino;
1730 __u64 s_last_error_block;
1731 const char *s_last_error_func;
1732 time64_t s_last_error_time;
1733 /*
1734 * If we are in a context where we cannot update the on-disk
1735 * superblock, we queue the work here. This is used to update
1736 * the error information in the superblock, and for periodic
1737 * updates of the superblock called from the commit callback
1738 * function.
1739 */
1740 struct work_struct s_sb_upd_work;
1741
1742 /* Atomic write unit values in bytes */
1743 unsigned int s_awu_min;
1744 unsigned int s_awu_max;
1745
1746 /* Ext4 fast commit sub transaction ID */
1747 atomic_t s_fc_subtid;
1748
1749 /*
1750 * After commit starts, the main queue gets locked, and the further
1751 * updates get added in the staging queue.
1752 */
1753 #define FC_Q_MAIN 0
1754 #define FC_Q_STAGING 1
1755 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1756 * that have data changes in them.
1757 */
1758 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1759 unsigned int s_fc_bytes;
1760 /*
1761 * Main fast commit lock. This lock protects accesses to the
1762 * following fields:
1763 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1764 */
1765 struct mutex s_fc_lock;
1766 struct buffer_head *s_fc_bh;
1767 struct ext4_fc_stats s_fc_stats;
1768 tid_t s_fc_ineligible_tid;
1769 #ifdef CONFIG_EXT4_DEBUG
1770 int s_fc_debug_max_replay;
1771 #endif
1772 struct ext4_fc_replay_state s_fc_replay_state;
1773 };
1774
EXT4_SB(struct super_block * sb)1775 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1776 {
1777 return sb->s_fs_info;
1778 }
EXT4_I(struct inode * inode)1779 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1780 {
1781 return container_of(inode, struct ext4_inode_info, vfs_inode);
1782 }
1783
ext4_writepages_down_read(struct super_block * sb)1784 static inline int ext4_writepages_down_read(struct super_block *sb)
1785 {
1786 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
1787 return memalloc_nofs_save();
1788 }
1789
ext4_writepages_up_read(struct super_block * sb,int ctx)1790 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
1791 {
1792 memalloc_nofs_restore(ctx);
1793 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
1794 }
1795
ext4_writepages_down_write(struct super_block * sb)1796 static inline int ext4_writepages_down_write(struct super_block *sb)
1797 {
1798 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
1799 return memalloc_nofs_save();
1800 }
1801
ext4_writepages_up_write(struct super_block * sb,int ctx)1802 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
1803 {
1804 memalloc_nofs_restore(ctx);
1805 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
1806 }
1807
ext4_valid_inum(struct super_block * sb,unsigned long ino)1808 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1809 {
1810 return ino == EXT4_ROOT_INO ||
1811 (ino >= EXT4_FIRST_INO(sb) &&
1812 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1813 }
1814
1815 /*
1816 * Returns: sbi->field[index]
1817 * Used to access an array element from the following sbi fields which require
1818 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1819 * - s_group_desc
1820 * - s_group_info
1821 * - s_flex_group
1822 */
1823 #define sbi_array_rcu_deref(sbi, field, index) \
1824 ({ \
1825 typeof(*((sbi)->field)) _v; \
1826 rcu_read_lock(); \
1827 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1828 rcu_read_unlock(); \
1829 _v; \
1830 })
1831
1832 /*
1833 * run-time mount flags
1834 */
1835 enum {
1836 EXT4_MF_MNTDIR_SAMPLED,
1837 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */
1838 EXT4_MF_JOURNAL_DESTROY /* Journal is in process of destroying */
1839 };
1840
ext4_set_mount_flag(struct super_block * sb,int bit)1841 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1842 {
1843 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1844 }
1845
ext4_clear_mount_flag(struct super_block * sb,int bit)1846 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1847 {
1848 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1849 }
1850
ext4_test_mount_flag(struct super_block * sb,int bit)1851 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1852 {
1853 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1854 }
1855
1856
1857 /*
1858 * Simulate_fail codes
1859 */
1860 #define EXT4_SIM_BBITMAP_EIO 1
1861 #define EXT4_SIM_BBITMAP_CRC 2
1862 #define EXT4_SIM_IBITMAP_EIO 3
1863 #define EXT4_SIM_IBITMAP_CRC 4
1864 #define EXT4_SIM_INODE_EIO 5
1865 #define EXT4_SIM_INODE_CRC 6
1866 #define EXT4_SIM_DIRBLOCK_EIO 7
1867 #define EXT4_SIM_DIRBLOCK_CRC 8
1868
ext4_simulate_fail(struct super_block * sb,unsigned long code)1869 static inline bool ext4_simulate_fail(struct super_block *sb,
1870 unsigned long code)
1871 {
1872 #ifdef CONFIG_EXT4_DEBUG
1873 struct ext4_sb_info *sbi = EXT4_SB(sb);
1874
1875 if (unlikely(sbi->s_simulate_fail == code)) {
1876 sbi->s_simulate_fail = 0;
1877 return true;
1878 }
1879 #endif
1880 return false;
1881 }
1882
1883 /*
1884 * Error number codes for s_{first,last}_error_errno
1885 *
1886 * Linux errno numbers are architecture specific, so we need to translate
1887 * them into something which is architecture independent. We don't define
1888 * codes for all errno's; just the ones which are most likely to be the cause
1889 * of an ext4_error() call.
1890 */
1891 #define EXT4_ERR_UNKNOWN 1
1892 #define EXT4_ERR_EIO 2
1893 #define EXT4_ERR_ENOMEM 3
1894 #define EXT4_ERR_EFSBADCRC 4
1895 #define EXT4_ERR_EFSCORRUPTED 5
1896 #define EXT4_ERR_ENOSPC 6
1897 #define EXT4_ERR_ENOKEY 7
1898 #define EXT4_ERR_EROFS 8
1899 #define EXT4_ERR_EFBIG 9
1900 #define EXT4_ERR_EEXIST 10
1901 #define EXT4_ERR_ERANGE 11
1902 #define EXT4_ERR_EOVERFLOW 12
1903 #define EXT4_ERR_EBUSY 13
1904 #define EXT4_ERR_ENOTDIR 14
1905 #define EXT4_ERR_ENOTEMPTY 15
1906 #define EXT4_ERR_ESHUTDOWN 16
1907 #define EXT4_ERR_EFAULT 17
1908
1909 /*
1910 * Inode dynamic state flags
1911 */
1912 enum {
1913 EXT4_STATE_NEW, /* inode is newly created */
1914 EXT4_STATE_XATTR, /* has in-inode xattrs */
1915 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1916 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1917 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1918 EXT4_STATE_NEWENTRY, /* File just added to dir */
1919 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1920 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1921 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1922 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1923 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1924 EXT4_STATE_FC_FLUSHING_DATA, /* Fast commit flushing data */
1925 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
1926 };
1927
1928 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1929 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1930 { \
1931 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1932 } \
1933 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1934 { \
1935 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1936 } \
1937 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1938 { \
1939 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1940 }
1941
1942 /* Add these declarations here only so that these functions can be
1943 * found by name. Otherwise, they are very hard to locate. */
1944 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1945 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1946 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1947 EXT4_INODE_BIT_FNS(flag, flags, 0)
1948
1949 /* Add these declarations here only so that these functions can be
1950 * found by name. Otherwise, they are very hard to locate. */
1951 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1952 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1953 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1954 #if (BITS_PER_LONG < 64)
1955 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1956
ext4_clear_state_flags(struct ext4_inode_info * ei)1957 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1958 {
1959 (ei)->i_state_flags = 0;
1960 }
1961 #else
1962 EXT4_INODE_BIT_FNS(state, flags, 32)
1963
ext4_clear_state_flags(struct ext4_inode_info * ei)1964 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1965 {
1966 /* We depend on the fact that callers will set i_flags */
1967 }
1968 #endif
1969 #else
1970 /* Assume that user mode programs are passing in an ext4fs superblock, not
1971 * a kernel struct super_block. This will allow us to call the feature-test
1972 * macros from user land. */
1973 #define EXT4_SB(sb) (sb)
1974 #endif
1975
ext4_verity_in_progress(struct inode * inode)1976 static inline bool ext4_verity_in_progress(struct inode *inode)
1977 {
1978 return IS_ENABLED(CONFIG_FS_VERITY) &&
1979 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1980 }
1981
1982 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1983
1984 /*
1985 * Codes for operating systems
1986 */
1987 #define EXT4_OS_LINUX 0
1988 #define EXT4_OS_HURD 1
1989 #define EXT4_OS_MASIX 2
1990 #define EXT4_OS_FREEBSD 3
1991 #define EXT4_OS_LITES 4
1992
1993 /*
1994 * Revision levels
1995 */
1996 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1997 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1998
1999 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
2000
2001 #define EXT4_GOOD_OLD_INODE_SIZE 128
2002
2003 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
2004 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
2005 #define EXT4_TIMESTAMP_MIN S32_MIN
2006
2007 /*
2008 * Feature set definitions
2009 */
2010
2011 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
2012 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
2013 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
2014 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
2015 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
2016 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
2017 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
2018 /*
2019 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
2020 * incompatible only if fast commit blocks are present in the FS. Since we
2021 * clear the journal (and thus the fast commit blocks), we don't mark FS as
2022 * incompatible. We also have a JBD2 incompat feature, which gets set when
2023 * there are fast commit blocks present in the journal.
2024 */
2025 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
2026 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
2027 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
2028
2029 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
2030 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
2031 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
2032 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
2033 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
2034 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
2035 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
2036 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
2037 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
2038 /*
2039 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
2040 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2041 * all other data structures' checksums. However, the METADATA_CSUM and
2042 * GDT_CSUM bits are mutually exclusive.
2043 */
2044 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
2045 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
2046 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
2047 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
2048 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be
2049 non-empty */
2050
2051 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
2052 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
2053 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
2054 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
2055 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
2056 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
2057 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
2058 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
2059 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
2060 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
2061 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
2062 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
2063 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
2064 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
2065 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
2066 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
2067
2068 extern void ext4_update_dynamic_rev(struct super_block *sb);
2069
2070 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2071 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2072 { \
2073 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2074 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2075 } \
2076 static inline void ext4_set_feature_##name(struct super_block *sb) \
2077 { \
2078 ext4_update_dynamic_rev(sb); \
2079 EXT4_SB(sb)->s_es->s_feature_compat |= \
2080 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2081 } \
2082 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2083 { \
2084 EXT4_SB(sb)->s_es->s_feature_compat &= \
2085 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2086 }
2087
2088 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2089 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2090 { \
2091 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2092 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2093 } \
2094 static inline void ext4_set_feature_##name(struct super_block *sb) \
2095 { \
2096 ext4_update_dynamic_rev(sb); \
2097 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2098 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2099 } \
2100 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2101 { \
2102 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2103 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2104 }
2105
2106 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2107 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2108 { \
2109 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2110 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2111 } \
2112 static inline void ext4_set_feature_##name(struct super_block *sb) \
2113 { \
2114 ext4_update_dynamic_rev(sb); \
2115 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2116 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2117 } \
2118 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2119 { \
2120 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2121 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2122 }
2123
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,DIR_PREALLOC)2124 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2125 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2126 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2127 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2128 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2129 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2130 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2131 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2132 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2133 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
2134
2135 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2136 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2137 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2138 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2139 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2140 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2141 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2142 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2143 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2144 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2145 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2146 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2147 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2148 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
2149
2150 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2151 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2152 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2153 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2154 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2155 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2156 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2157 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2158 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2159 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2160 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2161 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2162 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2163 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2164 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2165 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2166
2167 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2168 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2169 EXT4_FEATURE_INCOMPAT_META_BG)
2170 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2171 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2172 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2173
2174 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2175 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2176 EXT4_FEATURE_INCOMPAT_RECOVER| \
2177 EXT4_FEATURE_INCOMPAT_META_BG)
2178 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2179 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2180 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2181
2182 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2183 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2184 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2185 EXT4_FEATURE_INCOMPAT_RECOVER| \
2186 EXT4_FEATURE_INCOMPAT_META_BG| \
2187 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2188 EXT4_FEATURE_INCOMPAT_64BIT| \
2189 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2190 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2191 EXT4_FEATURE_INCOMPAT_MMP | \
2192 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2193 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2194 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2195 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2196 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2197 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2198 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2199 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2200 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2201 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2202 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2203 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2204 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2205 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2206 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2207 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2208 EXT4_FEATURE_RO_COMPAT_VERITY |\
2209 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2210
2211 #define EXTN_FEATURE_FUNCS(ver) \
2212 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2213 { \
2214 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2215 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2216 } \
2217 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2218 { \
2219 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2220 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2221 } \
2222 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2223 { \
2224 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2225 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2226 }
2227
2228 EXTN_FEATURE_FUNCS(2)
2229 EXTN_FEATURE_FUNCS(3)
2230 EXTN_FEATURE_FUNCS(4)
2231
2232 static inline bool ext4_has_compat_features(struct super_block *sb)
2233 {
2234 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2235 }
ext4_has_ro_compat_features(struct super_block * sb)2236 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2237 {
2238 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2239 }
ext4_has_incompat_features(struct super_block * sb)2240 static inline bool ext4_has_incompat_features(struct super_block *sb)
2241 {
2242 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2243 }
2244
2245 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2246
2247 /*
2248 * Superblock flags
2249 */
2250 enum {
2251 EXT4_FLAGS_RESIZING, /* Avoid superblock update and resize race */
2252 EXT4_FLAGS_SHUTDOWN, /* Prevent access to the file system */
2253 EXT4_FLAGS_BDEV_IS_DAX, /* Current block device support DAX */
2254 EXT4_FLAGS_EMERGENCY_RO,/* Emergency read-only due to fs errors */
2255 };
2256
ext4_forced_shutdown(struct super_block * sb)2257 static inline int ext4_forced_shutdown(struct super_block *sb)
2258 {
2259 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
2260 }
2261
ext4_emergency_ro(struct super_block * sb)2262 static inline int ext4_emergency_ro(struct super_block *sb)
2263 {
2264 return test_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags);
2265 }
2266
ext4_emergency_state(struct super_block * sb)2267 static inline int ext4_emergency_state(struct super_block *sb)
2268 {
2269 if (unlikely(ext4_forced_shutdown(sb)))
2270 return -EIO;
2271 if (unlikely(ext4_emergency_ro(sb)))
2272 return -EROFS;
2273 return 0;
2274 }
2275
2276 /*
2277 * Default values for user and/or group using reserved blocks
2278 */
2279 #define EXT4_DEF_RESUID 0
2280 #define EXT4_DEF_RESGID 0
2281
2282 /*
2283 * Default project ID
2284 */
2285 #define EXT4_DEF_PROJID 0
2286
2287 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2288
2289 /*
2290 * Default mount options
2291 */
2292 #define EXT4_DEFM_DEBUG 0x0001
2293 #define EXT4_DEFM_BSDGROUPS 0x0002
2294 #define EXT4_DEFM_XATTR_USER 0x0004
2295 #define EXT4_DEFM_ACL 0x0008
2296 #define EXT4_DEFM_UID16 0x0010
2297 #define EXT4_DEFM_JMODE 0x0060
2298 #define EXT4_DEFM_JMODE_DATA 0x0020
2299 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2300 #define EXT4_DEFM_JMODE_WBACK 0x0060
2301 #define EXT4_DEFM_NOBARRIER 0x0100
2302 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2303 #define EXT4_DEFM_DISCARD 0x0400
2304 #define EXT4_DEFM_NODELALLOC 0x0800
2305
2306 /*
2307 * Default journal batch times and ioprio.
2308 */
2309 #define EXT4_DEF_MIN_BATCH_TIME 0
2310 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2311 #define EXT4_DEF_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
2312
2313
2314 /*
2315 * Default values for superblock update
2316 */
2317 #define EXT4_DEF_SB_UPDATE_INTERVAL_SEC (3600) /* seconds (1 hour) */
2318 #define EXT4_DEF_SB_UPDATE_INTERVAL_KB (16384) /* kilobytes (16MB) */
2319
2320
2321 /*
2322 * Minimum number of groups in a flexgroup before we separate out
2323 * directories into the first block group of a flexgroup
2324 */
2325 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2326
2327 /*
2328 * Structure of a directory entry
2329 */
2330 #define EXT4_NAME_LEN 255
2331 /*
2332 * Base length of the ext4 directory entry excluding the name length
2333 */
2334 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2335
2336 struct ext4_dir_entry {
2337 __le32 inode; /* Inode number */
2338 __le16 rec_len; /* Directory entry length */
2339 __le16 name_len; /* Name length */
2340 char name[EXT4_NAME_LEN]; /* File name */
2341 };
2342
2343
2344 /*
2345 * Encrypted Casefolded entries require saving the hash on disk. This structure
2346 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2347 * boundary.
2348 */
2349 struct ext4_dir_entry_hash {
2350 __le32 hash;
2351 __le32 minor_hash;
2352 };
2353
2354 /*
2355 * The new version of the directory entry. Since EXT4 structures are
2356 * stored in intel byte order, and the name_len field could never be
2357 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2358 * file_type field.
2359 */
2360 struct ext4_dir_entry_2 {
2361 __le32 inode; /* Inode number */
2362 __le16 rec_len; /* Directory entry length */
2363 __u8 name_len; /* Name length */
2364 __u8 file_type; /* See file type macros EXT4_FT_* below */
2365 char name[EXT4_NAME_LEN]; /* File name */
2366 };
2367
2368 /*
2369 * Access the hashes at the end of ext4_dir_entry_2
2370 */
2371 #define EXT4_DIRENT_HASHES(entry) \
2372 ((struct ext4_dir_entry_hash *) \
2373 (((void *)(entry)) + \
2374 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2375 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(entry)->hash)
2376 #define EXT4_DIRENT_MINOR_HASH(entry) \
2377 le32_to_cpu(EXT4_DIRENT_HASHES(entry)->minor_hash)
2378
ext4_hash_in_dirent(const struct inode * inode)2379 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2380 {
2381 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2382 }
2383
2384 /*
2385 * This is a bogus directory entry at the end of each leaf block that
2386 * records checksums.
2387 */
2388 struct ext4_dir_entry_tail {
2389 __le32 det_reserved_zero1; /* Pretend to be unused */
2390 __le16 det_rec_len; /* 12 */
2391 __u8 det_reserved_zero2; /* Zero name length */
2392 __u8 det_reserved_ft; /* 0xDE, fake file type */
2393 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2394 };
2395
2396 #define EXT4_DIRENT_TAIL(block, blocksize) \
2397 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2398 ((blocksize) - \
2399 sizeof(struct ext4_dir_entry_tail))))
2400
2401 /*
2402 * Ext4 directory file types. Only the low 3 bits are used. The
2403 * other bits are reserved for now.
2404 */
2405 #define EXT4_FT_UNKNOWN 0
2406 #define EXT4_FT_REG_FILE 1
2407 #define EXT4_FT_DIR 2
2408 #define EXT4_FT_CHRDEV 3
2409 #define EXT4_FT_BLKDEV 4
2410 #define EXT4_FT_FIFO 5
2411 #define EXT4_FT_SOCK 6
2412 #define EXT4_FT_SYMLINK 7
2413
2414 #define EXT4_FT_MAX 8
2415
2416 #define EXT4_FT_DIR_CSUM 0xDE
2417
2418 /*
2419 * EXT4_DIR_PAD defines the directory entries boundaries
2420 *
2421 * NOTE: It must be a multiple of 4
2422 */
2423 #define EXT4_DIR_PAD 4
2424 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2425 #define EXT4_MAX_REC_LEN ((1<<16)-1)
2426
2427 /*
2428 * The rec_len is dependent on the type of directory. Directories that are
2429 * casefolded and encrypted need to store the hash as well, so we add room for
2430 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2431 * pass NULL for dir, as those entries do not use the extra fields.
2432 */
ext4_dir_rec_len(__u8 name_len,const struct inode * dir)2433 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2434 const struct inode *dir)
2435 {
2436 int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2437
2438 if (dir && ext4_hash_in_dirent(dir))
2439 rec_len += sizeof(struct ext4_dir_entry_hash);
2440 return (rec_len & ~EXT4_DIR_ROUND);
2441 }
2442
2443 /*
2444 * If we ever get support for fs block sizes > page_size, we'll need
2445 * to remove the #if statements in the next two functions...
2446 */
2447 static inline unsigned int
ext4_rec_len_from_disk(__le16 dlen,unsigned blocksize)2448 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2449 {
2450 unsigned len = le16_to_cpu(dlen);
2451
2452 #if (PAGE_SIZE >= 65536)
2453 if (len == EXT4_MAX_REC_LEN || len == 0)
2454 return blocksize;
2455 return (len & 65532) | ((len & 3) << 16);
2456 #else
2457 return len;
2458 #endif
2459 }
2460
ext4_rec_len_to_disk(unsigned len,unsigned blocksize)2461 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2462 {
2463 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2464 #if (PAGE_SIZE >= 65536)
2465 if (len < 65536)
2466 return cpu_to_le16(len);
2467 if (len == blocksize) {
2468 if (blocksize == 65536)
2469 return cpu_to_le16(EXT4_MAX_REC_LEN);
2470 else
2471 return cpu_to_le16(0);
2472 }
2473 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2474 #else
2475 return cpu_to_le16(len);
2476 #endif
2477 }
2478
2479 /*
2480 * Hash Tree Directory indexing
2481 * (c) Daniel Phillips, 2001
2482 */
2483
2484 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2485 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2486 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2487 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2488 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2489
2490 /* Legal values for the dx_root hash_version field: */
2491
2492 #define DX_HASH_LEGACY 0
2493 #define DX_HASH_HALF_MD4 1
2494 #define DX_HASH_TEA 2
2495 #define DX_HASH_LEGACY_UNSIGNED 3
2496 #define DX_HASH_HALF_MD4_UNSIGNED 4
2497 #define DX_HASH_TEA_UNSIGNED 5
2498 #define DX_HASH_SIPHASH 6
2499 #define DX_HASH_LAST DX_HASH_SIPHASH
2500
ext4_chksum(u32 crc,const void * address,unsigned int length)2501 static inline u32 ext4_chksum(u32 crc, const void *address, unsigned int length)
2502 {
2503 return crc32c(crc, address, length);
2504 }
2505
2506 #ifdef __KERNEL__
2507
2508 /* hash info structure used by the directory hash */
2509 struct dx_hash_info
2510 {
2511 u32 hash;
2512 u32 minor_hash;
2513 int hash_version;
2514 u32 *seed;
2515 };
2516
2517
2518 /* 32 and 64 bit signed EOF for dx directories */
2519 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2520 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2521
2522
2523 /*
2524 * Control parameters used by ext4_htree_next_block
2525 */
2526 #define HASH_NB_ALWAYS 1
2527
2528 struct ext4_filename {
2529 const struct qstr *usr_fname;
2530 struct fscrypt_str disk_name;
2531 struct dx_hash_info hinfo;
2532 #ifdef CONFIG_FS_ENCRYPTION
2533 struct fscrypt_str crypto_buf;
2534 #endif
2535 #if IS_ENABLED(CONFIG_UNICODE)
2536 struct qstr cf_name;
2537 #endif
2538 };
2539
2540 #define fname_name(p) ((p)->disk_name.name)
2541 #define fname_usr_name(p) ((p)->usr_fname->name)
2542 #define fname_len(p) ((p)->disk_name.len)
2543
2544 /*
2545 * Describe an inode's exact location on disk and in memory
2546 */
2547 struct ext4_iloc
2548 {
2549 struct buffer_head *bh;
2550 unsigned long offset;
2551 ext4_group_t block_group;
2552 };
2553
ext4_raw_inode(struct ext4_iloc * iloc)2554 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2555 {
2556 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2557 }
2558
ext4_is_quota_file(struct inode * inode)2559 static inline bool ext4_is_quota_file(struct inode *inode)
2560 {
2561 return IS_NOQUOTA(inode) &&
2562 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2563 }
2564
2565 /*
2566 * This structure is stuffed into the struct file's private_data field
2567 * for directories. It is where we put information so that we can do
2568 * readdir operations in hash tree order.
2569 */
2570 struct dir_private_info {
2571 struct rb_root root;
2572 struct rb_node *curr_node;
2573 struct fname *extra_fname;
2574 loff_t last_pos;
2575 __u32 curr_hash;
2576 __u32 curr_minor_hash;
2577 __u32 next_hash;
2578 u64 cookie;
2579 bool initialized;
2580 };
2581
2582 /* calculate the first block number of the group */
2583 static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block * sb,ext4_group_t group_no)2584 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2585 {
2586 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2587 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2588 }
2589
2590 /*
2591 * Special error return code only used by dx_probe() and its callers.
2592 */
2593 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2594
2595 /* htree levels for ext4 */
2596 #define EXT4_HTREE_LEVEL_COMPAT 2
2597 #define EXT4_HTREE_LEVEL 3
2598
ext4_dir_htree_level(struct super_block * sb)2599 static inline int ext4_dir_htree_level(struct super_block *sb)
2600 {
2601 return ext4_has_feature_largedir(sb) ?
2602 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2603 }
2604
2605 /*
2606 * Timeout and state flag for lazy initialization inode thread.
2607 */
2608 #define EXT4_DEF_LI_WAIT_MULT 10
2609 #define EXT4_DEF_LI_MAX_START_DELAY 5
2610 #define EXT4_LAZYINIT_QUIT 0x0001
2611 #define EXT4_LAZYINIT_RUNNING 0x0002
2612
2613 /*
2614 * Lazy inode table initialization info
2615 */
2616 struct ext4_lazy_init {
2617 unsigned long li_state;
2618 struct list_head li_request_list;
2619 struct mutex li_list_mtx;
2620 };
2621
2622 enum ext4_li_mode {
2623 EXT4_LI_MODE_PREFETCH_BBITMAP,
2624 EXT4_LI_MODE_ITABLE,
2625 };
2626
2627 struct ext4_li_request {
2628 struct super_block *lr_super;
2629 enum ext4_li_mode lr_mode;
2630 ext4_group_t lr_first_not_zeroed;
2631 ext4_group_t lr_next_group;
2632 struct list_head lr_request;
2633 unsigned long lr_next_sched;
2634 unsigned long lr_timeout;
2635 };
2636
2637 struct ext4_features {
2638 struct kobject f_kobj;
2639 struct completion f_kobj_unregister;
2640 };
2641
2642 /*
2643 * This structure will be used for multiple mount protection. It will be
2644 * written into the block number saved in the s_mmp_block field in the
2645 * superblock. Programs that check MMP should assume that if
2646 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2647 * to use the filesystem, regardless of how old the timestamp is.
2648 */
2649 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2650 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2651 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2652 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2653
2654 struct mmp_struct {
2655 __le32 mmp_magic; /* Magic number for MMP */
2656 __le32 mmp_seq; /* Sequence no. updated periodically */
2657
2658 /*
2659 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2660 * purposes and do not affect the correctness of the algorithm
2661 */
2662 __le64 mmp_time; /* Time last updated */
2663 char mmp_nodename[64]; /* Node which last updated MMP block */
2664 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2665
2666 /*
2667 * mmp_check_interval is used to verify if the MMP block has been
2668 * updated on the block device. The value is updated based on the
2669 * maximum time to write the MMP block during an update cycle.
2670 */
2671 __le16 mmp_check_interval;
2672
2673 __le16 mmp_pad1;
2674 __le32 mmp_pad2[226];
2675 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2676 };
2677
2678 /* arguments passed to the mmp thread */
2679 struct mmpd_data {
2680 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2681 struct super_block *sb; /* super block of the fs */
2682 };
2683
2684 /*
2685 * Check interval multiplier
2686 * The MMP block is written every update interval and initially checked every
2687 * update interval x the multiplier (the value is then adapted based on the
2688 * write latency). The reason is that writes can be delayed under load and we
2689 * don't want readers to incorrectly assume that the filesystem is no longer
2690 * in use.
2691 */
2692 #define EXT4_MMP_CHECK_MULT 2UL
2693
2694 /*
2695 * Minimum interval for MMP checking in seconds.
2696 */
2697 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2698
2699 /*
2700 * Maximum interval for MMP checking in seconds.
2701 */
2702 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2703
2704 /*
2705 * Function prototypes
2706 */
2707
2708 /*
2709 * Ok, these declarations are also in <linux/kernel.h> but none of the
2710 * ext4 source programs needs to include it so they are duplicated here.
2711 */
2712 # define NORET_TYPE /**/
2713 # define ATTRIB_NORET __attribute__((noreturn))
2714 # define NORET_AND noreturn,
2715
2716 /* bitmap.c */
2717 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2718 void ext4_inode_bitmap_csum_set(struct super_block *sb,
2719 struct ext4_group_desc *gdp,
2720 struct buffer_head *bh);
2721 int ext4_inode_bitmap_csum_verify(struct super_block *sb,
2722 struct ext4_group_desc *gdp,
2723 struct buffer_head *bh);
2724 void ext4_block_bitmap_csum_set(struct super_block *sb,
2725 struct ext4_group_desc *gdp,
2726 struct buffer_head *bh);
2727 int ext4_block_bitmap_csum_verify(struct super_block *sb,
2728 struct ext4_group_desc *gdp,
2729 struct buffer_head *bh);
2730
2731 /* balloc.c */
2732 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2733 ext4_fsblk_t blocknr,
2734 ext4_group_t *blockgrpp,
2735 ext4_grpblk_t *offsetp);
2736 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2737 ext4_fsblk_t block);
2738
2739 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2740 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2741 ext4_group_t group);
2742 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2743 ext4_fsblk_t goal,
2744 unsigned int flags,
2745 unsigned long *count,
2746 int *errp);
2747 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2748 s64 nclusters, unsigned int flags);
2749 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2750 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2751 ext4_group_t block_group,
2752 struct buffer_head ** bh);
2753 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2754 ext4_group_t group);
2755 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2756
2757 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2758 ext4_group_t block_group,
2759 bool ignore_locked);
2760 extern int ext4_wait_block_bitmap(struct super_block *sb,
2761 ext4_group_t block_group,
2762 struct buffer_head *bh);
2763 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2764 ext4_group_t block_group);
2765 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2766 ext4_group_t block_group,
2767 struct ext4_group_desc *gdp);
2768 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2769
2770 #if IS_ENABLED(CONFIG_UNICODE)
2771 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2772 const struct qstr *iname,
2773 struct ext4_filename *fname);
2774
ext4_fname_free_ci_filename(struct ext4_filename * fname)2775 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2776 {
2777 kfree(fname->cf_name.name);
2778 fname->cf_name.name = NULL;
2779 }
2780 #else
ext4_fname_setup_ci_filename(struct inode * dir,const struct qstr * iname,struct ext4_filename * fname)2781 static inline int ext4_fname_setup_ci_filename(struct inode *dir,
2782 const struct qstr *iname,
2783 struct ext4_filename *fname)
2784 {
2785 return 0;
2786 }
2787
ext4_fname_free_ci_filename(struct ext4_filename * fname)2788 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2789 {
2790 }
2791 #endif
2792
2793 /* ext4 encryption related stuff goes here crypto.c */
2794 #ifdef CONFIG_FS_ENCRYPTION
2795 extern const struct fscrypt_operations ext4_cryptops;
2796
2797 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2798 int lookup, struct ext4_filename *fname);
2799
2800 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2801 struct ext4_filename *fname);
2802
2803 void ext4_fname_free_filename(struct ext4_filename *fname);
2804
2805 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2806
2807 #else /* !CONFIG_FS_ENCRYPTION */
ext4_fname_setup_filename(struct inode * dir,const struct qstr * iname,int lookup,struct ext4_filename * fname)2808 static inline int ext4_fname_setup_filename(struct inode *dir,
2809 const struct qstr *iname,
2810 int lookup,
2811 struct ext4_filename *fname)
2812 {
2813 fname->usr_fname = iname;
2814 fname->disk_name.name = (unsigned char *) iname->name;
2815 fname->disk_name.len = iname->len;
2816
2817 return ext4_fname_setup_ci_filename(dir, iname, fname);
2818 }
2819
ext4_fname_prepare_lookup(struct inode * dir,struct dentry * dentry,struct ext4_filename * fname)2820 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2821 struct dentry *dentry,
2822 struct ext4_filename *fname)
2823 {
2824 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2825 }
2826
ext4_fname_free_filename(struct ext4_filename * fname)2827 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2828 {
2829 ext4_fname_free_ci_filename(fname);
2830 }
2831
ext4_ioctl_get_encryption_pwsalt(struct file * filp,void __user * arg)2832 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2833 void __user *arg)
2834 {
2835 return -EOPNOTSUPP;
2836 }
2837 #endif /* !CONFIG_FS_ENCRYPTION */
2838
2839 /* dir.c */
2840 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2841 struct file *,
2842 struct ext4_dir_entry_2 *,
2843 struct buffer_head *, char *, int,
2844 unsigned int);
2845 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2846 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2847 (de), (bh), (buf), (size), (offset)))
2848 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2849 __u32 minor_hash,
2850 struct ext4_dir_entry_2 *dirent,
2851 struct fscrypt_str *ent_name);
2852 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2853 extern int ext4_find_dest_de(struct inode *dir, struct buffer_head *bh,
2854 void *buf, int buf_size,
2855 struct ext4_filename *fname,
2856 struct ext4_dir_entry_2 **dest_de);
2857 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2858 struct ext4_dir_entry_2 *de,
2859 int buf_size,
2860 struct ext4_filename *fname);
ext4_update_dx_flag(struct inode * inode)2861 static inline void ext4_update_dx_flag(struct inode *inode)
2862 {
2863 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2864 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2865 /* ext4_iget() should have caught this... */
2866 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2867 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2868 }
2869 }
2870 static const unsigned char ext4_filetype_table[] = {
2871 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2872 };
2873
get_dtype(struct super_block * sb,int filetype)2874 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2875 {
2876 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2877 return DT_UNKNOWN;
2878
2879 return ext4_filetype_table[filetype];
2880 }
2881 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2882 void *buf, int buf_size);
2883
2884 /* fsync.c */
2885 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2886
2887 /* hash.c */
2888 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2889 struct dx_hash_info *hinfo);
2890
2891 /* ialloc.c */
2892 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2893 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,
2894 struct inode *, umode_t,
2895 const struct qstr *qstr, __u32 goal,
2896 uid_t *owner, __u32 i_flags,
2897 int handle_type, unsigned int line_no,
2898 int nblocks);
2899
2900 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2901 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \
2902 (goal), (owner), i_flags, 0, 0, 0)
2903 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
2904 type, nblocks) \
2905 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
2906 0, (type), __LINE__, (nblocks))
2907
2908
2909 extern void ext4_free_inode(handle_t *, struct inode *);
2910 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2911 extern unsigned long ext4_count_free_inodes(struct super_block *);
2912 extern unsigned long ext4_count_dirs(struct super_block *);
2913 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2914 extern int ext4_init_inode_table(struct super_block *sb,
2915 ext4_group_t group, int barrier);
2916 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2917
2918 /* fast_commit.c */
2919 int ext4_fc_info_show(struct seq_file *seq, void *v);
2920 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2921 void ext4_fc_init_inode(struct inode *inode);
2922 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2923 ext4_lblk_t end);
2924 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2925 struct dentry *dentry);
2926 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2927 struct dentry *dentry);
2928 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2929 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2930 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2931 struct dentry *dentry);
2932 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2933 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2934 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2935 void ext4_fc_del(struct inode *inode);
2936 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2937 void ext4_fc_replay_cleanup(struct super_block *sb);
2938 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2939 int __init ext4_fc_init_dentry_cache(void);
2940 void ext4_fc_destroy_dentry_cache(void);
2941 int ext4_fc_record_regions(struct super_block *sb, int ino,
2942 ext4_lblk_t lblk, ext4_fsblk_t pblk,
2943 int len, int replay);
2944
2945 /* mballoc.c */
2946 extern const struct seq_operations ext4_mb_seq_groups_ops;
2947 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2948 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2949 extern int ext4_mb_init(struct super_block *);
2950 extern void ext4_mb_release(struct super_block *);
2951 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2952 struct ext4_allocation_request *, int *);
2953 extern void ext4_discard_preallocations(struct inode *);
2954 extern int __init ext4_init_mballoc(void);
2955 extern void ext4_exit_mballoc(void);
2956 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2957 ext4_group_t group,
2958 unsigned int nr, int *cnt);
2959 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2960 unsigned int nr);
2961
2962 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2963 struct buffer_head *bh, ext4_fsblk_t block,
2964 unsigned long count, int flags);
2965 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2966 ext4_group_t ngroups);
2967 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2968 ext4_group_t i, struct ext4_group_desc *desc);
2969 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2970 ext4_fsblk_t block, unsigned long count);
2971 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2972 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2973 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2974 int len, bool state);
ext4_mb_cr_expensive(enum criteria cr)2975 static inline bool ext4_mb_cr_expensive(enum criteria cr)
2976 {
2977 return cr >= CR_GOAL_LEN_SLOW;
2978 }
2979
2980 /* inode.c */
2981 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2982 struct ext4_inode_info *ei);
2983 int ext4_inode_is_fast_symlink(struct inode *inode);
2984 void ext4_check_map_extents_env(struct inode *inode);
2985 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2986 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2987 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2988 bool wait, struct buffer_head **bhs);
2989 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2990 struct buffer_head *bh_result, int create);
2991 int ext4_get_block(struct inode *inode, sector_t iblock,
2992 struct buffer_head *bh_result, int create);
2993 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2994 struct buffer_head *bh, int create);
2995 int ext4_walk_page_buffers(handle_t *handle,
2996 struct inode *inode,
2997 struct buffer_head *head,
2998 unsigned from,
2999 unsigned to,
3000 int *partial,
3001 int (*fn)(handle_t *handle, struct inode *inode,
3002 struct buffer_head *bh));
3003 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
3004 struct buffer_head *bh);
3005 void ext4_set_inode_mapping_order(struct inode *inode);
3006 #define FALL_BACK_TO_NONDELALLOC 1
3007 #define CONVERT_INLINE_DATA 2
3008
3009 typedef enum {
3010 EXT4_IGET_NORMAL = 0,
3011 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
3012 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */
3013 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */
3014 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */
3015 } ext4_iget_flags;
3016
3017 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
3018 ext4_iget_flags flags, const char *function,
3019 unsigned int line);
3020
3021 #define ext4_iget(sb, ino, flags) \
3022 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
3023
3024 extern int ext4_write_inode(struct inode *, struct writeback_control *);
3025 extern int ext4_setattr(struct mnt_idmap *, struct dentry *,
3026 struct iattr *);
3027 extern u32 ext4_dio_alignment(struct inode *inode);
3028 extern int ext4_getattr(struct mnt_idmap *, const struct path *,
3029 struct kstat *, u32, unsigned int);
3030 extern void ext4_evict_inode(struct inode *);
3031 extern void ext4_clear_inode(struct inode *);
3032 extern int ext4_file_getattr(struct mnt_idmap *, const struct path *,
3033 struct kstat *, u32, unsigned int);
3034 extern void ext4_dirty_inode(struct inode *, int);
3035 extern int ext4_change_inode_journal_flag(struct inode *, int);
3036 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
3037 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
3038 struct ext4_iloc *iloc);
3039 extern int ext4_inode_attach_jinode(struct inode *inode);
3040 extern int ext4_can_truncate(struct inode *inode);
3041 extern int ext4_truncate(struct inode *);
3042 extern int ext4_break_layouts(struct inode *);
3043 extern int ext4_truncate_page_cache_block_range(struct inode *inode,
3044 loff_t start, loff_t end);
3045 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
3046 extern void ext4_set_inode_flags(struct inode *, bool init);
3047 extern int ext4_alloc_da_blocks(struct inode *inode);
3048 extern void ext4_set_aops(struct inode *inode);
3049 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
3050 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3051 extern int ext4_chunk_trans_extent(struct inode *inode, int nrblocks);
3052 extern int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
3053 int pextents);
3054 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3055 loff_t lstart, loff_t lend);
3056 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3057 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3058 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3059 extern void ext4_da_release_space(struct inode *inode, int to_free);
3060 extern void ext4_da_update_reserve_space(struct inode *inode,
3061 int used, int quota_claim);
3062 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3063 ext4_fsblk_t pblk, ext4_lblk_t len);
3064
is_special_ino(struct super_block * sb,unsigned long ino)3065 static inline bool is_special_ino(struct super_block *sb, unsigned long ino)
3066 {
3067 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3068
3069 return (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) ||
3070 ino == le32_to_cpu(es->s_usr_quota_inum) ||
3071 ino == le32_to_cpu(es->s_grp_quota_inum) ||
3072 ino == le32_to_cpu(es->s_prj_quota_inum) ||
3073 ino == le32_to_cpu(es->s_orphan_file_inum);
3074 }
3075
3076 /* indirect.c */
3077 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3078 struct ext4_map_blocks *map, int flags);
3079 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3080 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3081 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3082 ext4_lblk_t start, ext4_lblk_t end);
3083
3084 /* ioctl.c */
3085 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3086 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3087 int ext4_fileattr_set(struct mnt_idmap *idmap,
3088 struct dentry *dentry, struct file_kattr *fa);
3089 int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa);
3090 extern void ext4_reset_inode_seed(struct inode *inode);
3091 int ext4_update_overhead(struct super_block *sb, bool force);
3092 int ext4_force_shutdown(struct super_block *sb, u32 flags);
3093
3094 /* migrate.c */
3095 extern int ext4_ext_migrate(struct inode *);
3096 extern int ext4_ind_migrate(struct inode *inode);
3097
3098 /* namei.c */
3099 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3100 struct inode *inode);
3101 extern int ext4_dirblock_csum_verify(struct inode *inode,
3102 struct buffer_head *bh);
3103 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3104 __u32 start_minor_hash, __u32 *next_hash);
3105 extern int ext4_search_dir(struct buffer_head *bh,
3106 char *search_buf,
3107 int buf_size,
3108 struct inode *dir,
3109 struct ext4_filename *fname,
3110 unsigned int offset,
3111 struct ext4_dir_entry_2 **res_dir);
3112 extern int ext4_generic_delete_entry(struct inode *dir,
3113 struct ext4_dir_entry_2 *de_del,
3114 struct buffer_head *bh,
3115 void *entry_buf,
3116 int buf_size,
3117 int csum_size);
3118 extern bool ext4_empty_dir(struct inode *inode);
3119
3120 /* resize.c */
3121 extern void ext4_kvfree_array_rcu(void *to_free);
3122 extern int ext4_group_add(struct super_block *sb,
3123 struct ext4_new_group_data *input);
3124 extern int ext4_group_extend(struct super_block *sb,
3125 struct ext4_super_block *es,
3126 ext4_fsblk_t n_blocks_count);
3127 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3128 extern unsigned int ext4_list_backups(struct super_block *sb,
3129 unsigned int *three, unsigned int *five,
3130 unsigned int *seven);
3131
3132 /* super.c */
3133 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3134 sector_t block, blk_opf_t op_flags);
3135 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3136 sector_t block);
3137 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3138 bh_end_io_t *end_io, bool simu_fail);
3139 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3140 bh_end_io_t *end_io, bool simu_fail);
3141 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3142 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3143 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3144 extern int ext4_calculate_overhead(struct super_block *sb);
3145 extern __le32 ext4_superblock_csum(struct ext4_super_block *es);
3146 extern void ext4_superblock_csum_set(struct super_block *sb);
3147 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3148 ext4_group_t ngroup);
3149 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3150 char nbuf[16]);
3151 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3152 ext4_group_t block_group,
3153 unsigned int flags);
3154 extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb,
3155 ext4_group_t block_group);
3156
3157 extern __printf(7, 8)
3158 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3159 int, __u64, const char *, ...);
3160 extern __printf(6, 7)
3161 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3162 ext4_fsblk_t, int, const char *, ...);
3163 extern __printf(5, 6)
3164 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3165 const char *, ...);
3166 extern void __ext4_std_error(struct super_block *, const char *,
3167 unsigned int, int);
3168 extern __printf(4, 5)
3169 void __ext4_warning(struct super_block *, const char *, unsigned int,
3170 const char *, ...);
3171 extern __printf(4, 5)
3172 void __ext4_warning_inode(const struct inode *inode, const char *function,
3173 unsigned int line, const char *fmt, ...);
3174 extern __printf(3, 4)
3175 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3176 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3177 const char *, unsigned int, const char *);
3178 extern __printf(7, 8)
3179 void __ext4_grp_locked_error(const char *, unsigned int,
3180 struct super_block *, ext4_group_t,
3181 unsigned long, ext4_fsblk_t,
3182 const char *, ...);
3183
3184 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3185 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3186
3187 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3188 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3189
3190 #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3191 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3192 (fmt), ## a)
3193
3194 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3195 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3196
3197 #define ext4_abort(sb, err, fmt, a...) \
3198 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3199
3200 #ifdef CONFIG_PRINTK
3201
3202 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3203 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3204 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3205 __ext4_error_inode((inode), (func), (line), (block), \
3206 (err), (fmt), ##__VA_ARGS__)
3207 #define ext4_error_file(file, func, line, block, fmt, ...) \
3208 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3209 #define ext4_error(sb, fmt, ...) \
3210 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3211 ##__VA_ARGS__)
3212 #define ext4_error_err(sb, err, fmt, ...) \
3213 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3214 ##__VA_ARGS__)
3215 #define ext4_warning(sb, fmt, ...) \
3216 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3217 #define ext4_warning_inode(inode, fmt, ...) \
3218 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3219 #define ext4_msg(sb, level, fmt, ...) \
3220 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3221 #define dump_mmp_msg(sb, mmp, msg) \
3222 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3223 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3224 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3225 fmt, ##__VA_ARGS__)
3226
3227 #else
3228
3229 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3230 do { \
3231 no_printk(fmt, ##__VA_ARGS__); \
3232 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3233 } while (0)
3234 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3235 do { \
3236 no_printk(fmt, ##__VA_ARGS__); \
3237 __ext4_error_inode(inode, "", 0, block, err, " "); \
3238 } while (0)
3239 #define ext4_error_file(file, func, line, block, fmt, ...) \
3240 do { \
3241 no_printk(fmt, ##__VA_ARGS__); \
3242 __ext4_error_file(file, "", 0, block, " "); \
3243 } while (0)
3244 #define ext4_error(sb, fmt, ...) \
3245 do { \
3246 no_printk(fmt, ##__VA_ARGS__); \
3247 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3248 } while (0)
3249 #define ext4_error_err(sb, err, fmt, ...) \
3250 do { \
3251 no_printk(fmt, ##__VA_ARGS__); \
3252 __ext4_error(sb, "", 0, false, err, 0, " "); \
3253 } while (0)
3254 #define ext4_warning(sb, fmt, ...) \
3255 do { \
3256 no_printk(fmt, ##__VA_ARGS__); \
3257 __ext4_warning(sb, "", 0, " "); \
3258 } while (0)
3259 #define ext4_warning_inode(inode, fmt, ...) \
3260 do { \
3261 no_printk(fmt, ##__VA_ARGS__); \
3262 __ext4_warning_inode(inode, "", 0, " "); \
3263 } while (0)
3264 #define ext4_msg(sb, level, fmt, ...) \
3265 do { \
3266 no_printk(fmt, ##__VA_ARGS__); \
3267 __ext4_msg(sb, "", " "); \
3268 } while (0)
3269 #define dump_mmp_msg(sb, mmp, msg) \
3270 __dump_mmp_msg(sb, mmp, "", 0, "")
3271 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3272 do { \
3273 no_printk(fmt, ##__VA_ARGS__); \
3274 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3275 } while (0)
3276
3277 #endif
3278
3279 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3280 struct ext4_group_desc *bg);
3281 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3282 struct ext4_group_desc *bg);
3283 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3284 struct ext4_group_desc *bg);
3285 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3286 struct ext4_group_desc *bg);
3287 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3288 struct ext4_group_desc *bg);
3289 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3290 struct ext4_group_desc *bg);
3291 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3292 struct ext4_group_desc *bg);
3293 extern void ext4_block_bitmap_set(struct super_block *sb,
3294 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3295 extern void ext4_inode_bitmap_set(struct super_block *sb,
3296 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3297 extern void ext4_inode_table_set(struct super_block *sb,
3298 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3299 extern void ext4_free_group_clusters_set(struct super_block *sb,
3300 struct ext4_group_desc *bg,
3301 __u32 count);
3302 extern void ext4_free_inodes_set(struct super_block *sb,
3303 struct ext4_group_desc *bg, __u32 count);
3304 extern void ext4_used_dirs_set(struct super_block *sb,
3305 struct ext4_group_desc *bg, __u32 count);
3306 extern void ext4_itable_unused_set(struct super_block *sb,
3307 struct ext4_group_desc *bg, __u32 count);
3308 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3309 struct ext4_group_desc *gdp);
3310 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3311 struct ext4_group_desc *gdp);
3312 extern int ext4_register_li_request(struct super_block *sb,
3313 ext4_group_t first_not_zeroed);
3314
ext4_has_group_desc_csum(struct super_block * sb)3315 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3316 {
3317 return ext4_has_feature_gdt_csum(sb) ||
3318 ext4_has_feature_metadata_csum(sb);
3319 }
3320
3321 #define ext4_read_incompat_64bit_val(es, name) \
3322 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3323 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3324 le32_to_cpu(es->name##_lo))
3325
ext4_blocks_count(struct ext4_super_block * es)3326 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3327 {
3328 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3329 }
3330
ext4_r_blocks_count(struct ext4_super_block * es)3331 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3332 {
3333 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3334 }
3335
ext4_free_blocks_count(struct ext4_super_block * es)3336 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3337 {
3338 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3339 }
3340
ext4_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3341 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3342 ext4_fsblk_t blk)
3343 {
3344 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3345 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3346 }
3347
ext4_free_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3348 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3349 ext4_fsblk_t blk)
3350 {
3351 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3352 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3353 }
3354
ext4_r_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3355 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3356 ext4_fsblk_t blk)
3357 {
3358 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3359 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3360 }
3361
ext4_isize(struct super_block * sb,struct ext4_inode * raw_inode)3362 static inline loff_t ext4_isize(struct super_block *sb,
3363 struct ext4_inode *raw_inode)
3364 {
3365 if (ext4_has_feature_largedir(sb) ||
3366 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3367 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3368 le32_to_cpu(raw_inode->i_size_lo);
3369
3370 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3371 }
3372
ext4_isize_set(struct ext4_inode * raw_inode,loff_t i_size)3373 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3374 {
3375 raw_inode->i_size_lo = cpu_to_le32(i_size);
3376 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3377 }
3378
3379 /*
3380 * Reading s_groups_count requires using smp_rmb() afterwards. See
3381 * the locking protocol documented in the comments of ext4_group_add()
3382 * in resize.c
3383 */
ext4_get_groups_count(struct super_block * sb)3384 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3385 {
3386 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3387
3388 smp_rmb();
3389 return ngroups;
3390 }
3391
ext4_flex_group(struct ext4_sb_info * sbi,ext4_group_t block_group)3392 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3393 ext4_group_t block_group)
3394 {
3395 return block_group >> sbi->s_log_groups_per_flex;
3396 }
3397
ext4_flex_bg_size(struct ext4_sb_info * sbi)3398 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3399 {
3400 return 1 << sbi->s_log_groups_per_flex;
3401 }
3402
ext4_get_maxbytes(struct inode * inode)3403 static inline loff_t ext4_get_maxbytes(struct inode *inode)
3404 {
3405 if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
3406 return inode->i_sb->s_maxbytes;
3407 return EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
3408 }
3409
3410 #define ext4_std_error(sb, errno) \
3411 do { \
3412 if ((errno)) \
3413 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3414 } while (0)
3415
3416 #ifdef CONFIG_SMP
3417 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3418 * counters. So we need to make sure we have free clusters more
3419 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3420 */
3421 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3422 #else
3423 #define EXT4_FREECLUSTERS_WATERMARK 0
3424 #endif
3425
3426 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_i_disksize(struct inode * inode,loff_t newsize)3427 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3428 {
3429 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3430 !inode_is_locked(inode));
3431 down_write(&EXT4_I(inode)->i_data_sem);
3432 if (newsize > EXT4_I(inode)->i_disksize)
3433 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3434 up_write(&EXT4_I(inode)->i_data_sem);
3435 }
3436
3437 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_inode_size(struct inode * inode,loff_t newsize)3438 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3439 {
3440 int changed = 0;
3441
3442 if (newsize > inode->i_size) {
3443 i_size_write(inode, newsize);
3444 changed = 1;
3445 }
3446 if (newsize > EXT4_I(inode)->i_disksize) {
3447 ext4_update_i_disksize(inode, newsize);
3448 changed |= 2;
3449 }
3450 return changed;
3451 }
3452
3453 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3454 loff_t len);
3455
3456 struct ext4_group_info {
3457 unsigned long bb_state;
3458 #ifdef AGGRESSIVE_CHECK
3459 unsigned long bb_check_counter;
3460 #endif
3461 struct rb_root bb_free_root;
3462 ext4_grpblk_t bb_first_free; /* first free block */
3463 ext4_grpblk_t bb_free; /* total free blocks */
3464 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3465 int bb_avg_fragment_size_order; /* order of average
3466 fragment in BG */
3467 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3468 ext4_group_t bb_group; /* Group number */
3469 struct list_head bb_prealloc_list;
3470 #ifdef DOUBLE_CHECK
3471 void *bb_bitmap;
3472 #endif
3473 struct rw_semaphore alloc_sem;
3474 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3475 * regions, index is order.
3476 * bb_counters[3] = 5 means
3477 * 5 free 8-block regions. */
3478 };
3479
3480 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3481 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3482 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3483 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3484 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3485 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3486 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3487 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3488 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3489
3490 #define EXT4_MB_GRP_NEED_INIT(grp) \
3491 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3492 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3493 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3494 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3495 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3496
3497 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3498 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3499 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3500 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3501 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3502 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3503 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3504 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3505
3506 #define EXT4_MAX_CONTENTION 8
3507 #define EXT4_CONTENTION_THRESHOLD 2
3508
ext4_group_lock_ptr(struct super_block * sb,ext4_group_t group)3509 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3510 ext4_group_t group)
3511 {
3512 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3513 }
3514
3515 /*
3516 * Returns true if the filesystem is busy enough that attempts to
3517 * access the block group locks has run into contention.
3518 */
ext4_fs_is_busy(struct ext4_sb_info * sbi)3519 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3520 {
3521 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3522 }
3523
ext4_try_lock_group(struct super_block * sb,ext4_group_t group)3524 static inline bool ext4_try_lock_group(struct super_block *sb, ext4_group_t group)
3525 {
3526 if (!spin_trylock(ext4_group_lock_ptr(sb, group)))
3527 return false;
3528 /*
3529 * We're able to grab the lock right away, so drop the lock
3530 * contention counter.
3531 */
3532 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3533 return true;
3534 }
3535
ext4_lock_group(struct super_block * sb,ext4_group_t group)3536 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3537 {
3538 if (!ext4_try_lock_group(sb, group)) {
3539 /*
3540 * The lock is busy, so bump the contention counter,
3541 * and then wait on the spin lock.
3542 */
3543 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3544 EXT4_MAX_CONTENTION);
3545 spin_lock(ext4_group_lock_ptr(sb, group));
3546 }
3547 }
3548
ext4_unlock_group(struct super_block * sb,ext4_group_t group)3549 static inline void ext4_unlock_group(struct super_block *sb,
3550 ext4_group_t group)
3551 {
3552 spin_unlock(ext4_group_lock_ptr(sb, group));
3553 }
3554
3555 #ifdef CONFIG_QUOTA
ext4_quota_capable(struct super_block * sb)3556 static inline bool ext4_quota_capable(struct super_block *sb)
3557 {
3558 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3559 }
3560
ext4_is_quota_journalled(struct super_block * sb)3561 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3562 {
3563 struct ext4_sb_info *sbi = EXT4_SB(sb);
3564
3565 return (ext4_has_feature_quota(sb) ||
3566 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3567 }
3568 int ext4_enable_quotas(struct super_block *sb);
3569 #endif
3570
3571 /*
3572 * Block validity checking
3573 */
3574 #define ext4_check_indirect_blockref(inode, bh) \
3575 ext4_check_blockref(__func__, __LINE__, inode, \
3576 (__le32 *)(bh)->b_data, \
3577 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3578
3579 #define ext4_ind_check_inode(inode) \
3580 ext4_check_blockref(__func__, __LINE__, inode, \
3581 EXT4_I(inode)->i_data, \
3582 EXT4_NDIR_BLOCKS)
3583
3584 /*
3585 * Inodes and files operations
3586 */
3587
3588 /* dir.c */
3589 extern const struct file_operations ext4_dir_operations;
3590
3591 /* file.c */
3592 extern const struct inode_operations ext4_file_inode_operations;
3593 extern const struct file_operations ext4_file_operations;
3594 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3595
3596 /* inline.c */
3597 extern int ext4_get_max_inline_size(struct inode *inode);
3598 extern int ext4_find_inline_data_nolock(struct inode *inode);
3599 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3600 extern void ext4_update_final_de(void *de_buf, int old_size, int new_size);
3601
3602 int ext4_readpage_inline(struct inode *inode, struct folio *folio);
3603 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3604 struct inode *inode,
3605 loff_t pos, unsigned len,
3606 struct folio **foliop);
3607 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
3608 unsigned copied, struct folio *folio);
3609 extern int ext4_generic_write_inline_data(struct address_space *mapping,
3610 struct inode *inode,
3611 loff_t pos, unsigned len,
3612 struct folio **foliop,
3613 void **fsdata, bool da);
3614 extern int ext4_try_add_inline_entry(handle_t *handle,
3615 struct ext4_filename *fname,
3616 struct inode *dir, struct inode *inode);
3617 extern int ext4_try_create_inline_dir(handle_t *handle,
3618 struct inode *parent,
3619 struct inode *inode);
3620 extern int ext4_read_inline_dir(struct file *filp,
3621 struct dir_context *ctx,
3622 int *has_inline_data);
3623 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3624 struct inode *dir, ext4_lblk_t block,
3625 struct dx_hash_info *hinfo,
3626 __u32 start_hash, __u32 start_minor_hash,
3627 int *has_inline_data);
3628 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3629 struct ext4_filename *fname,
3630 struct ext4_dir_entry_2 **res_dir,
3631 int *has_inline_data);
3632 extern int ext4_delete_inline_entry(handle_t *handle,
3633 struct inode *dir,
3634 struct ext4_dir_entry_2 *de_del,
3635 struct buffer_head *bh,
3636 int *has_inline_data);
3637 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3638 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3639 struct ext4_dir_entry_2 **parent_de,
3640 int *retval);
3641 extern void *ext4_read_inline_link(struct inode *inode);
3642
3643 struct iomap;
3644 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3645
3646 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3647
3648 extern int ext4_convert_inline_data(struct inode *inode);
3649
ext4_has_inline_data(struct inode * inode)3650 static inline int ext4_has_inline_data(struct inode *inode)
3651 {
3652 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3653 EXT4_I(inode)->i_inline_off;
3654 }
3655
3656 /* namei.c */
3657 extern const struct inode_operations ext4_dir_inode_operations;
3658 extern const struct inode_operations ext4_special_inode_operations;
3659 extern struct dentry *ext4_get_parent(struct dentry *child);
3660 extern int ext4_init_dirblock(handle_t *handle, struct inode *inode,
3661 struct buffer_head *dir_block,
3662 unsigned int parent_ino, void *inline_buf,
3663 int inline_size);
3664 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3665 unsigned int blocksize);
3666 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3667 struct buffer_head *bh);
3668 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3669 struct inode *inode, struct dentry *dentry);
3670 extern int __ext4_link(struct inode *dir, struct inode *inode,
3671 struct dentry *dentry);
3672
3673 #define S_SHIFT 12
3674 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3675 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3676 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3677 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3678 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3679 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3680 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3681 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3682 };
3683
ext4_set_de_type(struct super_block * sb,struct ext4_dir_entry_2 * de,umode_t mode)3684 static inline void ext4_set_de_type(struct super_block *sb,
3685 struct ext4_dir_entry_2 *de,
3686 umode_t mode) {
3687 if (ext4_has_feature_filetype(sb))
3688 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3689 }
3690
3691 /* readpages.c */
3692 extern int ext4_mpage_readpages(struct inode *inode,
3693 struct readahead_control *rac, struct folio *folio);
3694 extern int __init ext4_init_post_read_processing(void);
3695 extern void ext4_exit_post_read_processing(void);
3696
3697 /* symlink.c */
3698 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3699 extern const struct inode_operations ext4_symlink_inode_operations;
3700 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3701
3702 /* sysfs.c */
3703 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3704 extern int ext4_register_sysfs(struct super_block *sb);
3705 extern void ext4_unregister_sysfs(struct super_block *sb);
3706 extern int __init ext4_init_sysfs(void);
3707 extern void ext4_exit_sysfs(void);
3708
3709 /* block_validity */
3710 extern void ext4_release_system_zone(struct super_block *sb);
3711 extern int ext4_setup_system_zone(struct super_block *sb);
3712 extern int __init ext4_init_system_zone(void);
3713 extern void ext4_exit_system_zone(void);
3714 extern int ext4_inode_block_valid(struct inode *inode,
3715 ext4_fsblk_t start_blk,
3716 unsigned int count);
3717 extern int ext4_check_blockref(const char *, unsigned int,
3718 struct inode *, __le32 *, unsigned int);
3719 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3720 ext4_fsblk_t start_blk, unsigned int count);
3721
3722
3723 /* extents.c */
3724 struct ext4_ext_path;
3725 struct ext4_extent;
3726
3727 /*
3728 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3729 * __le32.
3730 */
3731 #define EXT_MAX_BLOCKS 0xffffffff
3732
3733 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3734 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3735 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3736 struct ext4_map_blocks *map, int flags);
3737 extern int ext4_ext_truncate(handle_t *, struct inode *);
3738 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3739 ext4_lblk_t end);
3740 extern void ext4_ext_init(struct super_block *);
3741 extern void ext4_ext_release(struct super_block *);
3742 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3743 loff_t len);
3744 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3745 loff_t offset, ssize_t len);
3746 extern int ext4_convert_unwritten_extents_atomic(handle_t *handle,
3747 struct inode *inode, loff_t offset, ssize_t len);
3748 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3749 ext4_io_end_t *io_end);
3750 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3751 struct ext4_map_blocks *map, int flags);
3752 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3753 int num,
3754 struct ext4_ext_path *path);
3755 extern struct ext4_ext_path *ext4_ext_insert_extent(
3756 handle_t *handle, struct inode *inode,
3757 struct ext4_ext_path *path,
3758 struct ext4_extent *newext, int gb_flags);
3759 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3760 struct ext4_ext_path *,
3761 int flags);
3762 extern void ext4_free_ext_path(struct ext4_ext_path *);
3763 extern int ext4_ext_check_inode(struct inode *inode);
3764 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3765 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3766 __u64 start, __u64 len);
3767 extern int ext4_get_es_cache(struct inode *inode,
3768 struct fiemap_extent_info *fieinfo,
3769 __u64 start, __u64 len);
3770 extern int ext4_ext_precache(struct inode *inode);
3771 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3772 struct inode *inode2, ext4_lblk_t lblk1,
3773 ext4_lblk_t lblk2, ext4_lblk_t count,
3774 int mark_unwritten,int *err);
3775 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3776 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3777 int check_cred, int restart_cred,
3778 int revoke_cred);
3779 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3780 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3781 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3782 int len, int unwritten, ext4_fsblk_t pblk);
3783 extern int ext4_ext_clear_bb(struct inode *inode);
3784
3785
3786 /* move_extent.c */
3787 extern void ext4_double_down_write_data_sem(struct inode *first,
3788 struct inode *second);
3789 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3790 struct inode *donor_inode);
3791 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3792 __u64 start_orig, __u64 start_donor,
3793 __u64 len, __u64 *moved_len);
3794
3795 /* page-io.c */
3796 extern int __init ext4_init_pageio(void);
3797 extern void ext4_exit_pageio(void);
3798 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3799 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3800 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3801 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3802 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3803 struct writeback_control *wbc);
3804 extern void ext4_end_io_rsv_work(struct work_struct *work);
3805 extern void ext4_io_submit(struct ext4_io_submit *io);
3806 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
3807 size_t len);
3808 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3809 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3810
3811 /* mmp.c */
3812 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3813
3814 /* mmp.c */
3815 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3816
3817 /* verity.c */
3818 extern const struct fsverity_operations ext4_verityops;
3819
3820 /* orphan.c */
3821 extern int ext4_orphan_add(handle_t *, struct inode *);
3822 extern int ext4_orphan_del(handle_t *, struct inode *);
3823 extern void ext4_orphan_cleanup(struct super_block *sb,
3824 struct ext4_super_block *es);
3825 extern void ext4_release_orphan_info(struct super_block *sb);
3826 extern int ext4_init_orphan_info(struct super_block *sb);
3827 extern int ext4_orphan_file_empty(struct super_block *sb);
3828 extern void ext4_orphan_file_block_trigger(
3829 struct jbd2_buffer_trigger_type *triggers,
3830 struct buffer_head *bh,
3831 void *data, size_t size);
3832
3833 /*
3834 * Add new method to test whether block and inode bitmaps are properly
3835 * initialized. With uninit_bg reading the block from disk is not enough
3836 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3837 */
3838 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3839
bitmap_uptodate(struct buffer_head * bh)3840 static inline int bitmap_uptodate(struct buffer_head *bh)
3841 {
3842 return (buffer_uptodate(bh) &&
3843 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3844 }
set_bitmap_uptodate(struct buffer_head * bh)3845 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3846 {
3847 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3848 }
3849
3850 extern int ext4_resize_begin(struct super_block *sb);
3851 extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3852
ext4_set_io_unwritten_flag(struct ext4_io_end * io_end)3853 static inline void ext4_set_io_unwritten_flag(struct ext4_io_end *io_end)
3854 {
3855 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN))
3856 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3857 }
3858
ext4_clear_io_unwritten_flag(ext4_io_end_t * io_end)3859 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3860 {
3861 if (io_end->flag & EXT4_IO_END_UNWRITTEN)
3862 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3863 }
3864
3865 extern const struct iomap_ops ext4_iomap_ops;
3866 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3867 extern const struct iomap_ops ext4_iomap_report_ops;
3868
ext4_buffer_uptodate(struct buffer_head * bh)3869 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3870 {
3871 /*
3872 * If the buffer has the write error flag, we have failed
3873 * to write out data in the block. In this case, we don't
3874 * have to read the block because we may read the old data
3875 * successfully.
3876 */
3877 if (buffer_write_io_error(bh))
3878 set_buffer_uptodate(bh);
3879 return buffer_uptodate(bh);
3880 }
3881
ext4_inode_can_atomic_write(struct inode * inode)3882 static inline bool ext4_inode_can_atomic_write(struct inode *inode)
3883 {
3884
3885 return S_ISREG(inode->i_mode) &&
3886 ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
3887 EXT4_SB(inode->i_sb)->s_awu_min > 0;
3888 }
3889
3890 extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,
3891 loff_t pos, unsigned len,
3892 get_block_t *get_block);
3893 #endif /* __KERNEL__ */
3894
3895 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3896 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3897
3898 #endif /* _EXT4_H */
3899