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 find_suitable block group. Tries to
161 * allocate goal length but might trim the request if nothing
162 * is found after enough tries.
163 */
164 CR_GOAL_LEN_SLOW,
165
166 /*
167 * Finds the first free set of blocks and allocates
168 * those. This is only used in rare cases when
169 * CR_GOAL_LEN_SLOW also fails to allocate anything.
170 */
171 CR_ANY_FREE,
172
173 /*
174 * Number of criterias defined.
175 */
176 EXT4_MB_NUM_CRS
177 };
178
179 /*
180 * Flags used in mballoc's allocation_context flags field.
181 *
182 * Also used to show what's going on for debugging purposes when the
183 * flag field is exported via the traceport interface
184 */
185
186 /* prefer goal again. length */
187 #define EXT4_MB_HINT_MERGE 0x0001
188 /* blocks already reserved */
189 #define EXT4_MB_HINT_RESERVED 0x0002
190 /* metadata is being allocated */
191 #define EXT4_MB_HINT_METADATA 0x0004
192 /* first blocks in the file */
193 #define EXT4_MB_HINT_FIRST 0x0008
194 /* search for the best chunk */
195 #define EXT4_MB_HINT_BEST 0x0010
196 /* data is being allocated */
197 #define EXT4_MB_HINT_DATA 0x0020
198 /* don't preallocate (for tails) */
199 #define EXT4_MB_HINT_NOPREALLOC 0x0040
200 /* allocate for locality group */
201 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
202 /* allocate goal blocks or none */
203 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
204 /* goal is meaningful */
205 #define EXT4_MB_HINT_TRY_GOAL 0x0200
206 /* blocks already pre-reserved by delayed allocation */
207 #define EXT4_MB_DELALLOC_RESERVED 0x0400
208 /* We are doing stream allocation */
209 #define EXT4_MB_STREAM_ALLOC 0x0800
210 /* Use reserved root blocks if needed */
211 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
212 /* Use blocks from reserved pool */
213 #define EXT4_MB_USE_RESERVED 0x2000
214 /* Do strict check for free blocks while retrying block allocation */
215 #define EXT4_MB_STRICT_CHECK 0x4000
216 /* Large fragment size list lookup succeeded at least once for
217 * CR_POWER2_ALIGNED */
218 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED 0x8000
219 /* Avg fragment size rb tree lookup succeeded at least once for
220 * CR_GOAL_LEN_FAST */
221 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED 0x00010000
222 /* Avg fragment size rb tree lookup succeeded at least once for
223 * CR_BEST_AVAIL_LEN */
224 #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED 0x00020000
225
226 struct ext4_allocation_request {
227 /* target inode for block we're allocating */
228 struct inode *inode;
229 /* how many blocks we want to allocate */
230 unsigned int len;
231 /* logical block in target inode */
232 ext4_lblk_t logical;
233 /* the closest logical allocated block to the left */
234 ext4_lblk_t lleft;
235 /* the closest logical allocated block to the right */
236 ext4_lblk_t lright;
237 /* phys. target (a hint) */
238 ext4_fsblk_t goal;
239 /* phys. block for the closest logical allocated block to the left */
240 ext4_fsblk_t pleft;
241 /* phys. block for the closest logical allocated block to the right */
242 ext4_fsblk_t pright;
243 /* flags. see above EXT4_MB_HINT_* */
244 unsigned int flags;
245 };
246
247 /*
248 * Logical to physical block mapping, used by ext4_map_blocks()
249 *
250 * This structure is used to pass requests into ext4_map_blocks() as
251 * well as to store the information returned by ext4_map_blocks(). It
252 * takes less room on the stack than a struct buffer_head.
253 */
254 #define EXT4_MAP_NEW BIT(BH_New)
255 #define EXT4_MAP_MAPPED BIT(BH_Mapped)
256 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
257 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
258 #define EXT4_MAP_DELAYED BIT(BH_Delay)
259 /*
260 * This is for use in ext4_map_query_blocks() for a special case where we can
261 * have a physically and logically contiguous blocks split across two leaf
262 * nodes instead of a single extent. This is required in case of atomic writes
263 * to know whether the returned extent is last in leaf. If yes, then lookup for
264 * next in leaf block in ext4_map_query_blocks_next_in_leaf().
265 * - This is never going to be added to any buffer head state.
266 * - We use the next available bit after BH_BITMAP_UPTODATE.
267 */
268 #define EXT4_MAP_QUERY_LAST_IN_LEAF BIT(BH_BITMAP_UPTODATE + 1)
269 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
270 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
271 EXT4_MAP_DELAYED | EXT4_MAP_QUERY_LAST_IN_LEAF)
272
273 struct ext4_map_blocks {
274 ext4_fsblk_t m_pblk;
275 ext4_lblk_t m_lblk;
276 unsigned int m_len;
277 unsigned int m_flags;
278 };
279
280 /*
281 * Block validity checking, system zone rbtree.
282 */
283 struct ext4_system_blocks {
284 struct rb_root root;
285 struct rcu_head rcu;
286 };
287
288 /*
289 * Flags for ext4_io_end->flags
290 */
291 #define EXT4_IO_END_UNWRITTEN 0x0001
292 #define EXT4_IO_END_FAILED 0x0002
293
294 #define EXT4_IO_END_DEFER_COMPLETION (EXT4_IO_END_UNWRITTEN | EXT4_IO_END_FAILED)
295
296 struct ext4_io_end_vec {
297 struct list_head list; /* list of io_end_vec */
298 loff_t offset; /* offset in the file */
299 ssize_t size; /* size of the extent */
300 };
301
302 /*
303 * For converting unwritten extents on a work queue. 'handle' is used for
304 * buffered writeback.
305 */
306 typedef struct ext4_io_end {
307 struct list_head list; /* per-file finished IO list */
308 handle_t *handle; /* handle reserved for extent
309 * conversion */
310 struct inode *inode; /* file being written to */
311 struct bio *bio; /* Linked list of completed
312 * bios covering the extent */
313 unsigned int flag; /* unwritten or not */
314 refcount_t count; /* reference counter */
315 struct list_head list_vec; /* list of ext4_io_end_vec */
316 } ext4_io_end_t;
317
318 struct ext4_io_submit {
319 struct writeback_control *io_wbc;
320 struct bio *io_bio;
321 ext4_io_end_t *io_end;
322 sector_t io_next_block;
323 };
324
325 /*
326 * Special inodes numbers
327 */
328 #define EXT4_BAD_INO 1 /* Bad blocks inode */
329 #define EXT4_ROOT_INO 2 /* Root inode */
330 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
331 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
332 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
333 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
334 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
335 #define EXT4_JOURNAL_INO 8 /* Journal inode */
336
337 /* First non-reserved inode for old ext4 filesystems */
338 #define EXT4_GOOD_OLD_FIRST_INO 11
339
340 /*
341 * Maximal count of links to a file
342 */
343 #define EXT4_LINK_MAX 65000
344
345 /*
346 * Macro-instructions used to manage several block sizes
347 */
348 #define EXT4_MIN_BLOCK_SIZE 1024
349 #define EXT4_MAX_BLOCK_SIZE 65536
350 #define EXT4_MIN_BLOCK_LOG_SIZE 10
351 #define EXT4_MAX_BLOCK_LOG_SIZE 16
352 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
353 #ifdef __KERNEL__
354 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
355 #else
356 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
357 #endif
358 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
359 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
360 EXT4_SB(s)->s_cluster_bits)
361 #ifdef __KERNEL__
362 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
363 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
364 #else
365 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
366 #endif
367 #ifdef __KERNEL__
368 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
369 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
370 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
371 #else
372 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
373 EXT4_GOOD_OLD_INODE_SIZE : \
374 (s)->s_inode_size)
375 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
376 EXT4_GOOD_OLD_FIRST_INO : \
377 (s)->s_first_ino)
378 #endif
379 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
380 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
381 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
382 blkbits))
383 #define EXT4_B_TO_LBLK(inode, offset) \
384 (round_up((offset), i_blocksize(inode)) >> (inode)->i_blkbits)
385
386 /* Translate a block number to a cluster number */
387 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
388 /* Translate a cluster number to a block number */
389 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
390 /* Translate # of blks to # of clusters */
391 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
392 (sbi)->s_cluster_bits)
393 /* Mask out the low bits to get the starting block of the cluster */
394 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
395 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
396 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
397 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
398 /* Fill in the low bits to get the last block of the cluster */
399 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
400 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
401 /* Get the cluster offset */
402 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
403 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
404 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
405 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
406
407 /*
408 * Structure of a blocks group descriptor
409 */
410 struct ext4_group_desc
411 {
412 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
413 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
414 __le32 bg_inode_table_lo; /* Inodes table block */
415 __le16 bg_free_blocks_count_lo;/* Free blocks count */
416 __le16 bg_free_inodes_count_lo;/* Free inodes count */
417 __le16 bg_used_dirs_count_lo; /* Directories count */
418 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
419 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
420 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
421 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
422 __le16 bg_itable_unused_lo; /* Unused inodes count */
423 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
424 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
425 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
426 __le32 bg_inode_table_hi; /* Inodes table block MSB */
427 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
428 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
429 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
430 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
431 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
432 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
433 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
434 __u32 bg_reserved;
435 };
436
437 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
438 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
439 sizeof(__le16))
440 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
441 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
442 sizeof(__le16))
443
444 /*
445 * Structure of a flex block group info
446 */
447
448 struct flex_groups {
449 atomic64_t free_clusters;
450 atomic_t free_inodes;
451 atomic_t used_dirs;
452 };
453
454 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
455 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
456 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
457
458 /*
459 * Macro-instructions used to manage group descriptors
460 */
461 #define EXT4_MIN_DESC_SIZE 32
462 #define EXT4_MIN_DESC_SIZE_64BIT 64
463 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
464 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
465 #ifdef __KERNEL__
466 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
467 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
468 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
469 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
470 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
471 #else
472 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
473 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
474 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
475 #endif
476
477 /*
478 * Constants relative to the data blocks
479 */
480 #define EXT4_NDIR_BLOCKS 12
481 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
482 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
483 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
484 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
485
486 /*
487 * Inode flags
488 */
489 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
490 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
491 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
492 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
493 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
494 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
495 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
496 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
497 /* Reserved for compression usage... */
498 #define EXT4_DIRTY_FL 0x00000100
499 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
500 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
501 /* nb: was previously EXT2_ECOMPR_FL */
502 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
503 /* End compression flags --- maybe not all used */
504 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
505 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
506 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
507 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
508 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
509 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
510 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
511 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
512 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
513 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
514 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
515
516 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
517
518 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
519 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
520 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
521 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
522
523 /* User modifiable flags */
524 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
525 EXT4_UNRM_FL | \
526 EXT4_COMPR_FL | \
527 EXT4_SYNC_FL | \
528 EXT4_IMMUTABLE_FL | \
529 EXT4_APPEND_FL | \
530 EXT4_NODUMP_FL | \
531 EXT4_NOATIME_FL | \
532 EXT4_JOURNAL_DATA_FL | \
533 EXT4_NOTAIL_FL | \
534 EXT4_DIRSYNC_FL | \
535 EXT4_TOPDIR_FL | \
536 EXT4_EXTENTS_FL | \
537 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
538 EXT4_DAX_FL | \
539 EXT4_PROJINHERIT_FL | \
540 EXT4_CASEFOLD_FL)
541
542 /* User visible flags */
543 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
544 EXT4_DIRTY_FL | \
545 EXT4_COMPRBLK_FL | \
546 EXT4_NOCOMPR_FL | \
547 EXT4_ENCRYPT_FL | \
548 EXT4_INDEX_FL | \
549 EXT4_VERITY_FL | \
550 EXT4_INLINE_DATA_FL)
551
552 /* Flags that should be inherited by new inodes from their parent. */
553 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
554 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
555 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
556 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
557 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
558 EXT4_DAX_FL)
559
560 /* Flags that are appropriate for regular files (all but dir-specific ones). */
561 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
562 EXT4_PROJINHERIT_FL))
563
564 /* Flags that are appropriate for non-directories/regular files. */
565 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
566
567 /* The only flags that should be swapped */
568 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
569
570 /* Flags which are mutually exclusive to DAX */
571 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
572 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
573
574 /* Mask out flags that are inappropriate for the given type of inode. */
ext4_mask_flags(umode_t mode,__u32 flags)575 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
576 {
577 if (S_ISDIR(mode))
578 return flags;
579 else if (S_ISREG(mode))
580 return flags & EXT4_REG_FLMASK;
581 else
582 return flags & EXT4_OTHER_FLMASK;
583 }
584
585 /*
586 * Inode flags used for atomic set/get
587 */
588 enum {
589 EXT4_INODE_SECRM = 0, /* Secure deletion */
590 EXT4_INODE_UNRM = 1, /* Undelete */
591 EXT4_INODE_COMPR = 2, /* Compress file */
592 EXT4_INODE_SYNC = 3, /* Synchronous updates */
593 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
594 EXT4_INODE_APPEND = 5, /* writes to file may only append */
595 EXT4_INODE_NODUMP = 6, /* do not dump file */
596 EXT4_INODE_NOATIME = 7, /* do not update atime */
597 /* Reserved for compression usage... */
598 EXT4_INODE_DIRTY = 8,
599 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
600 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
601 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
602 /* End compression flags --- maybe not all used */
603 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
604 EXT4_INODE_IMAGIC = 13, /* AFS directory */
605 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
606 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
607 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
608 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
609 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
610 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
611 EXT4_INODE_VERITY = 20, /* Verity protected inode */
612 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
613 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
614 EXT4_INODE_DAX = 25, /* Inode is DAX */
615 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
616 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
617 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
618 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
619 };
620
621 /*
622 * Since it's pretty easy to mix up bit numbers and hex values, we use a
623 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
624 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
625 * any extra space in the compiled kernel image, otherwise, the build will fail.
626 * It's important that these values are the same, since we are using
627 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
628 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
629 * values found in ext2, ext3 and ext4 filesystems, and of course the values
630 * defined in e2fsprogs.
631 *
632 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
633 */
634 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
635 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
636
ext4_check_flag_values(void)637 static inline void ext4_check_flag_values(void)
638 {
639 CHECK_FLAG_VALUE(SECRM);
640 CHECK_FLAG_VALUE(UNRM);
641 CHECK_FLAG_VALUE(COMPR);
642 CHECK_FLAG_VALUE(SYNC);
643 CHECK_FLAG_VALUE(IMMUTABLE);
644 CHECK_FLAG_VALUE(APPEND);
645 CHECK_FLAG_VALUE(NODUMP);
646 CHECK_FLAG_VALUE(NOATIME);
647 CHECK_FLAG_VALUE(DIRTY);
648 CHECK_FLAG_VALUE(COMPRBLK);
649 CHECK_FLAG_VALUE(NOCOMPR);
650 CHECK_FLAG_VALUE(ENCRYPT);
651 CHECK_FLAG_VALUE(INDEX);
652 CHECK_FLAG_VALUE(IMAGIC);
653 CHECK_FLAG_VALUE(JOURNAL_DATA);
654 CHECK_FLAG_VALUE(NOTAIL);
655 CHECK_FLAG_VALUE(DIRSYNC);
656 CHECK_FLAG_VALUE(TOPDIR);
657 CHECK_FLAG_VALUE(HUGE_FILE);
658 CHECK_FLAG_VALUE(EXTENTS);
659 CHECK_FLAG_VALUE(VERITY);
660 CHECK_FLAG_VALUE(EA_INODE);
661 CHECK_FLAG_VALUE(INLINE_DATA);
662 CHECK_FLAG_VALUE(PROJINHERIT);
663 CHECK_FLAG_VALUE(CASEFOLD);
664 CHECK_FLAG_VALUE(RESERVED);
665 }
666
667 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
668 struct compat_ext4_new_group_input {
669 u32 group;
670 compat_u64 block_bitmap;
671 compat_u64 inode_bitmap;
672 compat_u64 inode_table;
673 u32 blocks_count;
674 u16 reserved_blocks;
675 u16 unused;
676 };
677 #endif
678
679 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
680 struct ext4_new_group_data {
681 __u32 group;
682 __u64 block_bitmap;
683 __u64 inode_bitmap;
684 __u64 inode_table;
685 __u32 blocks_count;
686 __u16 reserved_blocks;
687 __u16 mdata_blocks;
688 __u32 free_clusters_count;
689 };
690
691 /* Indexes used to index group tables in ext4_new_group_data */
692 enum {
693 BLOCK_BITMAP = 0, /* block bitmap */
694 INODE_BITMAP, /* inode bitmap */
695 INODE_TABLE, /* inode tables */
696 GROUP_TABLE_COUNT,
697 };
698
699 /*
700 * Flags used by ext4_map_blocks()
701 */
702 /* Allocate any needed blocks and/or convert an unwritten
703 extent to be an initialized ext4 */
704 #define EXT4_GET_BLOCKS_CREATE 0x0001
705 /* Request the creation of an unwritten extent */
706 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
707 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
708 EXT4_GET_BLOCKS_CREATE)
709 /* Caller is from the delayed allocation writeout path
710 * finally doing the actual allocation of delayed blocks */
711 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
712 /* caller is from the direct IO path, request to creation of an
713 unwritten extents if not allocated, split the unwritten
714 extent if blocks has been preallocated already*/
715 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
716 #define EXT4_GET_BLOCKS_CONVERT 0x0010
717 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
718 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
719 /* Eventual metadata allocation (due to growing extent tree)
720 * should not fail, so try to use reserved blocks for that.*/
721 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
722 /* Don't normalize allocation size (used for fallocate) */
723 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
724 /* Convert written extents to unwritten */
725 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
726 /* Write zeros to newly created written extents */
727 #define EXT4_GET_BLOCKS_ZERO 0x0200
728 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
729 EXT4_GET_BLOCKS_ZERO)
730 /* Caller is in the context of data submission, such as writeback,
731 * fsync, etc. Especially, in the generic writeback path, caller will
732 * submit data before dropping transaction handle. This allows jbd2
733 * to avoid submitting data before commit. */
734 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
735 /* Convert extent to initialized after IO complete */
736 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT |\
737 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |\
738 EXT4_GET_BLOCKS_IO_SUBMIT)
739 /* Caller is in the atomic contex, find extent if it has been cached */
740 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
741 /*
742 * Atomic write caller needs this to query in the slow path of mixed mapping
743 * case, when a contiguous extent can be split across two adjacent leaf nodes.
744 * Look EXT4_MAP_QUERY_LAST_IN_LEAF.
745 */
746 #define EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF 0x1000
747
748 /*
749 * The bit position of these flags must not overlap with any of the
750 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
751 * read_extent_tree_block(), ext4_split_extent_at(),
752 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
753 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
754 * caching the extents when reading from the extent tree while a
755 * truncate or punch hole operation is in progress.
756 */
757 #define EXT4_EX_NOCACHE 0x40000000
758 #define EXT4_EX_FORCE_CACHE 0x20000000
759 #define EXT4_EX_NOFAIL 0x10000000
760 /*
761 * ext4_map_query_blocks() uses this filter mask to filter the flags needed to
762 * pass while lookup/querying of on disk extent tree.
763 */
764 #define EXT4_EX_QUERY_FILTER (EXT4_EX_NOCACHE | EXT4_EX_FORCE_CACHE |\
765 EXT4_EX_NOFAIL |\
766 EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF)
767
768 /*
769 * Flags used by ext4_free_blocks
770 */
771 #define EXT4_FREE_BLOCKS_METADATA 0x0001
772 #define EXT4_FREE_BLOCKS_FORGET 0x0002
773 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
774 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
775 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
776 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
777 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
778
779 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
780 /*
781 * ioctl commands in 32 bit emulation
782 */
783 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
784 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
785 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
786 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
787 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
788 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
789 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
790 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
791 #endif
792
793 /* Max physical block we can address w/o extents */
794 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
795
796 /* Max logical block we can support */
797 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
798
799 /*
800 * Structure of an inode on the disk
801 */
802 struct ext4_inode {
803 __le16 i_mode; /* File mode */
804 __le16 i_uid; /* Low 16 bits of Owner Uid */
805 __le32 i_size_lo; /* Size in bytes */
806 __le32 i_atime; /* Access time */
807 __le32 i_ctime; /* Inode Change time */
808 __le32 i_mtime; /* Modification time */
809 __le32 i_dtime; /* Deletion Time */
810 __le16 i_gid; /* Low 16 bits of Group Id */
811 __le16 i_links_count; /* Links count */
812 __le32 i_blocks_lo; /* Blocks count */
813 __le32 i_flags; /* File flags */
814 union {
815 struct {
816 __le32 l_i_version;
817 } linux1;
818 struct {
819 __u32 h_i_translator;
820 } hurd1;
821 struct {
822 __u32 m_i_reserved1;
823 } masix1;
824 } osd1; /* OS dependent 1 */
825 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
826 __le32 i_generation; /* File version (for NFS) */
827 __le32 i_file_acl_lo; /* File ACL */
828 __le32 i_size_high;
829 __le32 i_obso_faddr; /* Obsoleted fragment address */
830 union {
831 struct {
832 __le16 l_i_blocks_high; /* were l_i_reserved1 */
833 __le16 l_i_file_acl_high;
834 __le16 l_i_uid_high; /* these 2 fields */
835 __le16 l_i_gid_high; /* were reserved2[0] */
836 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
837 __le16 l_i_reserved;
838 } linux2;
839 struct {
840 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
841 __u16 h_i_mode_high;
842 __u16 h_i_uid_high;
843 __u16 h_i_gid_high;
844 __u32 h_i_author;
845 } hurd2;
846 struct {
847 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
848 __le16 m_i_file_acl_high;
849 __u32 m_i_reserved2[2];
850 } masix2;
851 } osd2; /* OS dependent 2 */
852 __le16 i_extra_isize;
853 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
854 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
855 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
856 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
857 __le32 i_crtime; /* File Creation time */
858 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
859 __le32 i_version_hi; /* high 32 bits for 64-bit version */
860 __le32 i_projid; /* Project ID */
861 };
862
863 #define EXT4_EPOCH_BITS 2
864 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
865 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
866
867 /*
868 * Extended fields will fit into an inode if the filesystem was formatted
869 * with large inodes (-I 256 or larger) and there are not currently any EAs
870 * consuming all of the available space. For new inodes we always reserve
871 * enough space for the kernel's known extended fields, but for inodes
872 * created with an old kernel this might not have been the case. None of
873 * the extended inode fields is critical for correct filesystem operation.
874 * This macro checks if a certain field fits in the inode. Note that
875 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
876 */
877 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
878 ((offsetof(typeof(*ext4_inode), field) + \
879 sizeof((ext4_inode)->field)) \
880 <= (EXT4_GOOD_OLD_INODE_SIZE + \
881 (einode)->i_extra_isize)) \
882
883 /*
884 * We use an encoding that preserves the times for extra epoch "00":
885 *
886 * extra msb of adjust for signed
887 * epoch 32-bit 32-bit tv_sec to
888 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
889 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
890 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
891 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
892 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
893 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
894 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
895 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
896 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
897 *
898 * Note that previous versions of the kernel on 64-bit systems would
899 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
900 * 1970. e2fsck will correct this, assuming that it is run on the
901 * affected filesystem before 2242.
902 */
903
ext4_encode_extra_time(struct timespec64 ts)904 static inline __le32 ext4_encode_extra_time(struct timespec64 ts)
905 {
906 u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK;
907 return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS));
908 }
909
ext4_decode_extra_time(__le32 base,__le32 extra)910 static inline struct timespec64 ext4_decode_extra_time(__le32 base,
911 __le32 extra)
912 {
913 struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) };
914
915 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
916 ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
917 ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
918 return ts;
919 }
920
921 #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \
922 do { \
923 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
924 (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \
925 (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \
926 } else \
927 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \
928 } while (0)
929
930 #define EXT4_INODE_SET_ATIME(inode, raw_inode) \
931 EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode))
932
933 #define EXT4_INODE_SET_MTIME(inode, raw_inode) \
934 EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode))
935
936 #define EXT4_INODE_SET_CTIME(inode, raw_inode) \
937 EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode))
938
939 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
940 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
941 EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \
942 raw_inode, (einode)->xtime)
943
944 #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \
945 (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \
946 ext4_decode_extra_time((raw_inode)->xtime, \
947 (raw_inode)->xtime ## _extra) : \
948 (struct timespec64) { \
949 .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \
950 })
951
952 #define EXT4_INODE_GET_ATIME(inode, raw_inode) \
953 do { \
954 inode_set_atime_to_ts(inode, \
955 EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \
956 } while (0)
957
958 #define EXT4_INODE_GET_MTIME(inode, raw_inode) \
959 do { \
960 inode_set_mtime_to_ts(inode, \
961 EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \
962 } while (0)
963
964 #define EXT4_INODE_GET_CTIME(inode, raw_inode) \
965 do { \
966 inode_set_ctime_to_ts(inode, \
967 EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \
968 } while (0)
969
970 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
971 do { \
972 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
973 (einode)->xtime = \
974 EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \
975 raw_inode); \
976 else \
977 (einode)->xtime = (struct timespec64){0, 0}; \
978 } while (0)
979
980 #define i_disk_version osd1.linux1.l_i_version
981
982 #if defined(__KERNEL__) || defined(__linux__)
983 #define i_reserved1 osd1.linux1.l_i_reserved1
984 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
985 #define i_blocks_high osd2.linux2.l_i_blocks_high
986 #define i_uid_low i_uid
987 #define i_gid_low i_gid
988 #define i_uid_high osd2.linux2.l_i_uid_high
989 #define i_gid_high osd2.linux2.l_i_gid_high
990 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
991
992 #elif defined(__GNU__)
993
994 #define i_translator osd1.hurd1.h_i_translator
995 #define i_uid_high osd2.hurd2.h_i_uid_high
996 #define i_gid_high osd2.hurd2.h_i_gid_high
997 #define i_author osd2.hurd2.h_i_author
998
999 #elif defined(__masix__)
1000
1001 #define i_reserved1 osd1.masix1.m_i_reserved1
1002 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
1003 #define i_reserved2 osd2.masix2.m_i_reserved2
1004
1005 #endif /* defined(__KERNEL__) || defined(__linux__) */
1006
1007 #include "extents_status.h"
1008 #include "fast_commit.h"
1009
1010 /*
1011 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
1012 *
1013 * These are needed to avoid lockdep false positives when we need to
1014 * allocate blocks to the quota inode during ext4_map_blocks(), while
1015 * holding i_data_sem for a normal (non-quota) inode. Since we don't
1016 * do quota tracking for the quota inode, this avoids deadlock (as
1017 * well as infinite recursion, since it isn't turtles all the way
1018 * down...)
1019 *
1020 * I_DATA_SEM_NORMAL - Used for most inodes
1021 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
1022 * where the second inode has larger inode number
1023 * than the first
1024 * I_DATA_SEM_QUOTA - Used for quota inodes only
1025 * I_DATA_SEM_EA - Used for ea_inodes only
1026 */
1027 enum {
1028 I_DATA_SEM_NORMAL = 0,
1029 I_DATA_SEM_OTHER,
1030 I_DATA_SEM_QUOTA,
1031 I_DATA_SEM_EA
1032 };
1033
1034
1035 /*
1036 * fourth extended file system inode data in memory
1037 */
1038 struct ext4_inode_info {
1039 __le32 i_data[15]; /* unconverted */
1040 __u32 i_dtime;
1041 ext4_fsblk_t i_file_acl;
1042
1043 /*
1044 * i_block_group is the number of the block group which contains
1045 * this file's inode. Constant across the lifetime of the inode,
1046 * it is used for making block allocation decisions - we try to
1047 * place a file's data blocks near its inode block, and new inodes
1048 * near to their parent directory's inode.
1049 */
1050 ext4_group_t i_block_group;
1051 ext4_lblk_t i_dir_start_lookup;
1052 #if (BITS_PER_LONG < 64)
1053 unsigned long i_state_flags; /* Dynamic state flags */
1054 #endif
1055 unsigned long i_flags;
1056
1057 /*
1058 * Extended attributes can be read independently of the main file
1059 * data. Taking i_rwsem even when reading would cause contention
1060 * between readers of EAs and writers of regular file data, so
1061 * instead we synchronize on xattr_sem when reading or changing
1062 * EAs.
1063 */
1064 struct rw_semaphore xattr_sem;
1065
1066 /*
1067 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1068 * i_orphan is used.
1069 */
1070 union {
1071 struct list_head i_orphan; /* unlinked but open inodes */
1072 unsigned int i_orphan_idx; /* Index in orphan file */
1073 };
1074
1075 /* Fast commit related info */
1076
1077 /* For tracking dentry create updates */
1078 struct list_head i_fc_dilist;
1079 struct list_head i_fc_list; /*
1080 * inodes that need fast commit
1081 * protected by sbi->s_fc_lock.
1082 */
1083
1084 /* Start of lblk range that needs to be committed in this fast commit */
1085 ext4_lblk_t i_fc_lblk_start;
1086
1087 /* End of lblk range that needs to be committed in this fast commit */
1088 ext4_lblk_t i_fc_lblk_len;
1089
1090 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1091
1092 /* Fast commit wait queue for this inode */
1093 wait_queue_head_t i_fc_wait;
1094
1095 /*
1096 * Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len
1097 * and inode's EXT4_FC_STATE_COMMITTING state bit.
1098 */
1099 spinlock_t i_fc_lock;
1100
1101 /*
1102 * i_disksize keeps track of what the inode size is ON DISK, not
1103 * in memory. During truncate, i_size is set to the new size by
1104 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1105 * set i_disksize to 0 until the truncate is actually under way.
1106 *
1107 * The intent is that i_disksize always represents the blocks which
1108 * are used by this file. This allows recovery to restart truncate
1109 * on orphans if we crash during truncate. We actually write i_disksize
1110 * into the on-disk inode when writing inodes out, instead of i_size.
1111 *
1112 * The only time when i_disksize and i_size may be different is when
1113 * a truncate is in progress. The only things which change i_disksize
1114 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1115 */
1116 loff_t i_disksize;
1117
1118 /*
1119 * i_data_sem is for serialising ext4_truncate() against
1120 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1121 * data tree are chopped off during truncate. We can't do that in
1122 * ext4 because whenever we perform intermediate commits during
1123 * truncate, the inode and all the metadata blocks *must* be in a
1124 * consistent state which allows truncation of the orphans to restart
1125 * during recovery. Hence we must fix the get_block-vs-truncate race
1126 * by other means, so we have i_data_sem.
1127 */
1128 struct rw_semaphore i_data_sem;
1129 struct inode vfs_inode;
1130 struct jbd2_inode *jinode;
1131
1132 /*
1133 * File creation time. Its function is same as that of
1134 * struct timespec64 i_{a,c,m}time in the generic inode.
1135 */
1136 struct timespec64 i_crtime;
1137
1138 /* mballoc */
1139 atomic_t i_prealloc_active;
1140
1141 /* allocation reservation info for delalloc */
1142 /* In case of bigalloc, this refer to clusters rather than blocks */
1143 unsigned int i_reserved_data_blocks;
1144 struct rb_root i_prealloc_node;
1145 rwlock_t i_prealloc_lock;
1146
1147 /* extents status tree */
1148 struct ext4_es_tree i_es_tree;
1149 rwlock_t i_es_lock;
1150 struct list_head i_es_list;
1151 unsigned int i_es_all_nr; /* protected by i_es_lock */
1152 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1153 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1154 extents to shrink. Protected by
1155 i_es_lock */
1156
1157 /* ialloc */
1158 ext4_group_t i_last_alloc_group;
1159
1160 /* pending cluster reservations for bigalloc file systems */
1161 struct ext4_pending_tree i_pending_tree;
1162
1163 /* on-disk additional length */
1164 __u16 i_extra_isize;
1165
1166 /* Indicate the inline data space. */
1167 u16 i_inline_off;
1168 u16 i_inline_size;
1169
1170 #ifdef CONFIG_QUOTA
1171 /* quota space reservation, managed internally by quota code */
1172 qsize_t i_reserved_quota;
1173 #endif
1174 spinlock_t i_block_reservation_lock;
1175
1176 /* Lock protecting lists below */
1177 spinlock_t i_completed_io_lock;
1178 /*
1179 * Completed IOs that need unwritten extents handling and have
1180 * transaction reserved
1181 */
1182 struct list_head i_rsv_conversion_list;
1183 struct work_struct i_rsv_conversion_work;
1184
1185 /*
1186 * Transactions that contain inode's metadata needed to complete
1187 * fsync and fdatasync, respectively.
1188 */
1189 tid_t i_sync_tid;
1190 tid_t i_datasync_tid;
1191
1192 #ifdef CONFIG_QUOTA
1193 struct dquot __rcu *i_dquot[MAXQUOTAS];
1194 #endif
1195
1196 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1197 __u32 i_csum_seed;
1198
1199 kprojid_t i_projid;
1200 };
1201
1202 /*
1203 * File system states
1204 */
1205 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1206 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1207 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1208 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1209
1210 /*
1211 * Misc. filesystem flags
1212 */
1213 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1214 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1215 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1216
1217 /*
1218 * Mount flags set via mount options or defaults
1219 */
1220 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1221 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1222 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1223 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1224 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1225 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1226 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1227 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1228 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1229 #ifdef CONFIG_FS_DAX
1230 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1231 #else
1232 #define EXT4_MOUNT_DAX_ALWAYS 0
1233 #endif
1234 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1235 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1236 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1237 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1238 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1239 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1240 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1241 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1242 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1243 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1244 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1245 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1246 * enable enforcement for hidden
1247 * quota files */
1248 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1249 * enforcement for hidden quota
1250 * files */
1251 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1252 * enforcement */
1253 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1254 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1255 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1256 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1257 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1258 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1259 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1260 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1261 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1262 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1263
1264 /*
1265 * Mount flags set either automatically (could not be set by mount option)
1266 * based on per file system feature or property or in special cases such as
1267 * distinguishing between explicit mount option definition and default.
1268 */
1269 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1270 specified delalloc */
1271 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1272 size of blocksize * 8
1273 blocks */
1274 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1275 file systems */
1276 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1277 specified journal checksum */
1278
1279 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1280 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1281 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1282 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1283 * scanning in mballoc
1284 */
1285 #define EXT4_MOUNT2_ABORT 0x00000100 /* Abort filesystem */
1286
1287 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1288 ~EXT4_MOUNT_##opt
1289 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1290 EXT4_MOUNT_##opt
1291 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1292 EXT4_MOUNT_##opt)
1293
1294 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1295 ~EXT4_MOUNT2_##opt
1296 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1297 EXT4_MOUNT2_##opt
1298 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1299 EXT4_MOUNT2_##opt)
1300
1301 #define ext4_test_and_set_bit __test_and_set_bit_le
1302 #define ext4_set_bit __set_bit_le
1303 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1304 #define ext4_clear_bit __clear_bit_le
1305 #define ext4_test_bit test_bit_le
1306 #define ext4_find_next_zero_bit find_next_zero_bit_le
1307 #define ext4_find_next_bit find_next_bit_le
1308
1309 extern void mb_set_bits(void *bm, int cur, int len);
1310
1311 /*
1312 * Maximal mount counts between two filesystem checks
1313 */
1314 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1315 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1316
1317 /*
1318 * Behaviour when detecting errors
1319 */
1320 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1321 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1322 #define EXT4_ERRORS_PANIC 3 /* Panic */
1323 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1324
1325 /* Metadata checksum algorithm codes */
1326 #define EXT4_CRC32C_CHKSUM 1
1327
1328 #define EXT4_LABEL_MAX 16
1329
1330 /*
1331 * Structure of the super block
1332 */
1333 struct ext4_super_block {
1334 /*00*/ __le32 s_inodes_count; /* Inodes count */
1335 __le32 s_blocks_count_lo; /* Blocks count */
1336 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1337 __le32 s_free_blocks_count_lo; /* Free blocks count */
1338 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1339 __le32 s_first_data_block; /* First Data Block */
1340 __le32 s_log_block_size; /* Block size */
1341 __le32 s_log_cluster_size; /* Allocation cluster size */
1342 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1343 __le32 s_clusters_per_group; /* # Clusters per group */
1344 __le32 s_inodes_per_group; /* # Inodes per group */
1345 __le32 s_mtime; /* Mount time */
1346 /*30*/ __le32 s_wtime; /* Write time */
1347 __le16 s_mnt_count; /* Mount count */
1348 __le16 s_max_mnt_count; /* Maximal mount count */
1349 __le16 s_magic; /* Magic signature */
1350 __le16 s_state; /* File system state */
1351 __le16 s_errors; /* Behaviour when detecting errors */
1352 __le16 s_minor_rev_level; /* minor revision level */
1353 /*40*/ __le32 s_lastcheck; /* time of last check */
1354 __le32 s_checkinterval; /* max. time between checks */
1355 __le32 s_creator_os; /* OS */
1356 __le32 s_rev_level; /* Revision level */
1357 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1358 __le16 s_def_resgid; /* Default gid for reserved blocks */
1359 /*
1360 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1361 *
1362 * Note: the difference between the compatible feature set and
1363 * the incompatible feature set is that if there is a bit set
1364 * in the incompatible feature set that the kernel doesn't
1365 * know about, it should refuse to mount the filesystem.
1366 *
1367 * e2fsck's requirements are more strict; if it doesn't know
1368 * about a feature in either the compatible or incompatible
1369 * feature set, it must abort and not try to meddle with
1370 * things it doesn't understand...
1371 */
1372 __le32 s_first_ino; /* First non-reserved inode */
1373 __le16 s_inode_size; /* size of inode structure */
1374 __le16 s_block_group_nr; /* block group # of this superblock */
1375 __le32 s_feature_compat; /* compatible feature set */
1376 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1377 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1378 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1379 /*78*/ char s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */
1380 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1381 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1382 /*
1383 * Performance hints. Directory preallocation should only
1384 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1385 */
1386 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1387 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1388 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1389 /*
1390 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1391 */
1392 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1393 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1394 __le32 s_journal_dev; /* device number of journal file */
1395 __le32 s_last_orphan; /* start of list of inodes to delete */
1396 __le32 s_hash_seed[4]; /* HTREE hash seed */
1397 __u8 s_def_hash_version; /* Default hash version to use */
1398 __u8 s_jnl_backup_type;
1399 __le16 s_desc_size; /* size of group descriptor */
1400 /*100*/ __le32 s_default_mount_opts;
1401 __le32 s_first_meta_bg; /* First metablock block group */
1402 __le32 s_mkfs_time; /* When the filesystem was created */
1403 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1404 /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */
1405 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1406 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1407 __le32 s_free_blocks_count_hi; /* Free blocks count */
1408 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1409 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1410 __le32 s_flags; /* Miscellaneous flags */
1411 __le16 s_raid_stride; /* RAID stride */
1412 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1413 __le64 s_mmp_block; /* Block for multi-mount protection */
1414 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1415 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1416 __u8 s_checksum_type; /* metadata checksum algorithm used */
1417 __u8 s_encryption_level; /* versioning level for encryption */
1418 __u8 s_reserved_pad; /* Padding to next 32bits */
1419 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1420 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1421 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1422 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1423 snapshot's future use */
1424 __le32 s_snapshot_list; /* inode number of the head of the
1425 on-disk snapshot list */
1426 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1427 __le32 s_error_count; /* number of fs errors */
1428 __le32 s_first_error_time; /* first time an error happened */
1429 __le32 s_first_error_ino; /* inode involved in first error */
1430 __le64 s_first_error_block; /* block involved of first error */
1431 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1432 __le32 s_first_error_line; /* line number where error happened */
1433 __le32 s_last_error_time; /* most recent time of an error */
1434 __le32 s_last_error_ino; /* inode involved in last error */
1435 __le32 s_last_error_line; /* line number where error happened */
1436 __le64 s_last_error_block; /* block involved of last error */
1437 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1438 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1439 __u8 s_mount_opts[64];
1440 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1441 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1442 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1443 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1444 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1445 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1446 __le32 s_lpf_ino; /* Location of the lost+found inode */
1447 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1448 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1449 __u8 s_wtime_hi;
1450 __u8 s_mtime_hi;
1451 __u8 s_mkfs_time_hi;
1452 __u8 s_lastcheck_hi;
1453 __u8 s_first_error_time_hi;
1454 __u8 s_last_error_time_hi;
1455 __u8 s_first_error_errcode;
1456 __u8 s_last_error_errcode;
1457 __le16 s_encoding; /* Filename charset encoding */
1458 __le16 s_encoding_flags; /* Filename charset encoding flags */
1459 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
1460 __le32 s_reserved[94]; /* Padding to the end of the block */
1461 __le32 s_checksum; /* crc32c(superblock) */
1462 };
1463
1464 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1465
1466 #ifdef __KERNEL__
1467
1468 /* Number of quota types we support */
1469 #define EXT4_MAXQUOTAS 3
1470
1471 #define EXT4_ENC_UTF8_12_1 1
1472
1473 /* Types of ext4 journal triggers */
1474 enum ext4_journal_trigger_type {
1475 EXT4_JTR_ORPHAN_FILE,
1476 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
1477 };
1478
1479 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1480
1481 struct ext4_journal_trigger {
1482 struct jbd2_buffer_trigger_type tr_triggers;
1483 struct super_block *sb;
1484 };
1485
EXT4_TRIGGER(struct jbd2_buffer_trigger_type * trigger)1486 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1487 struct jbd2_buffer_trigger_type *trigger)
1488 {
1489 return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1490 }
1491
1492 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1493
1494 /* Structure at the tail of orphan block */
1495 struct ext4_orphan_block_tail {
1496 __le32 ob_magic;
1497 __le32 ob_checksum;
1498 };
1499
ext4_inodes_per_orphan_block(struct super_block * sb)1500 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1501 {
1502 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1503 sizeof(u32);
1504 }
1505
1506 struct ext4_orphan_block {
1507 atomic_t ob_free_entries; /* Number of free orphan entries in block */
1508 struct buffer_head *ob_bh; /* Buffer for orphan block */
1509 };
1510
1511 /*
1512 * Info about orphan file.
1513 */
1514 struct ext4_orphan_info {
1515 int of_blocks; /* Number of orphan blocks in a file */
1516 __u32 of_csum_seed; /* Checksum seed for orphan file */
1517 struct ext4_orphan_block *of_binfo; /* Array with info about orphan
1518 * file blocks */
1519 };
1520
1521 /*
1522 * fourth extended-fs super-block data in memory
1523 */
1524 struct ext4_sb_info {
1525 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1526 unsigned long s_inodes_per_block;/* Number of inodes per block */
1527 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1528 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1529 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1530 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1531 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1532 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1533 ext4_group_t s_groups_count; /* Number of groups in the fs */
1534 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1535 unsigned long s_overhead; /* # of fs overhead clusters */
1536 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1537 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1538 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1539 struct buffer_head * s_sbh; /* Buffer containing the super block */
1540 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1541 /* Array of bh's for the block group descriptors */
1542 struct buffer_head * __rcu *s_group_desc;
1543 unsigned int s_mount_opt;
1544 unsigned int s_mount_opt2;
1545 unsigned long s_mount_flags;
1546 unsigned int s_def_mount_opt;
1547 unsigned int s_def_mount_opt2;
1548 ext4_fsblk_t s_sb_block;
1549 atomic64_t s_resv_clusters;
1550 kuid_t s_resuid;
1551 kgid_t s_resgid;
1552 unsigned short s_mount_state;
1553 unsigned short s_pad;
1554 int s_addr_per_block_bits;
1555 int s_desc_per_block_bits;
1556 int s_inode_size;
1557 int s_first_ino;
1558 unsigned int s_inode_readahead_blks;
1559 unsigned int s_inode_goal;
1560 u32 s_hash_seed[4];
1561 int s_def_hash_version;
1562 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1563 struct percpu_counter s_freeclusters_counter;
1564 struct percpu_counter s_freeinodes_counter;
1565 struct percpu_counter s_dirs_counter;
1566 struct percpu_counter s_dirtyclusters_counter;
1567 struct percpu_counter s_sra_exceeded_retry_limit;
1568 struct blockgroup_lock *s_blockgroup_lock;
1569 struct proc_dir_entry *s_proc;
1570 struct kobject s_kobj;
1571 struct completion s_kobj_unregister;
1572 struct super_block *s_sb;
1573 struct buffer_head *s_mmp_bh;
1574
1575 /* Journaling */
1576 struct journal_s *s_journal;
1577 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1578 struct mutex s_orphan_lock; /* Protects on disk list changes */
1579 struct list_head s_orphan; /* List of orphaned inodes in on disk
1580 list */
1581 struct ext4_orphan_info s_orphan_info;
1582 unsigned long s_commit_interval;
1583 u32 s_max_batch_time;
1584 u32 s_min_batch_time;
1585 struct file *s_journal_bdev_file;
1586 #ifdef CONFIG_QUOTA
1587 /* Names of quota files with journalled quota */
1588 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1589 int s_jquota_fmt; /* Format of quota to use */
1590 #endif
1591 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1592 struct ext4_system_blocks __rcu *s_system_blks;
1593
1594 #ifdef EXTENTS_STATS
1595 /* ext4 extents stats */
1596 unsigned long s_ext_min;
1597 unsigned long s_ext_max;
1598 unsigned long s_depth_max;
1599 spinlock_t s_ext_stats_lock;
1600 unsigned long s_ext_blocks;
1601 unsigned long s_ext_extents;
1602 #endif
1603
1604 /* for buddy allocator */
1605 struct ext4_group_info ** __rcu *s_group_info;
1606 struct inode *s_buddy_cache;
1607 spinlock_t s_md_lock;
1608 unsigned short *s_mb_offsets;
1609 unsigned int *s_mb_maxs;
1610 unsigned int s_group_info_size;
1611 unsigned int s_mb_free_pending;
1612 struct list_head s_freed_data_list[2]; /* List of blocks to be freed
1613 after commit completed */
1614 struct list_head s_discard_list;
1615 struct work_struct s_discard_work;
1616 atomic_t s_retry_alloc_pending;
1617 struct list_head *s_mb_avg_fragment_size;
1618 rwlock_t *s_mb_avg_fragment_size_locks;
1619 struct list_head *s_mb_largest_free_orders;
1620 rwlock_t *s_mb_largest_free_orders_locks;
1621
1622 /* tunables */
1623 unsigned long s_stripe;
1624 unsigned int s_mb_max_linear_groups;
1625 unsigned int s_mb_stream_request;
1626 unsigned int s_mb_max_to_scan;
1627 unsigned int s_mb_min_to_scan;
1628 unsigned int s_mb_stats;
1629 unsigned int s_mb_order2_reqs;
1630 unsigned int s_mb_group_prealloc;
1631 unsigned int s_max_dir_size_kb;
1632 /* where last allocation was done - for stream allocation */
1633 unsigned long s_mb_last_group;
1634 unsigned long s_mb_last_start;
1635 unsigned int s_mb_prefetch;
1636 unsigned int s_mb_prefetch_limit;
1637 unsigned int s_mb_best_avail_max_trim_order;
1638 unsigned int s_sb_update_sec;
1639 unsigned int s_sb_update_kb;
1640
1641 /* stats for buddy allocator */
1642 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1643 atomic_t s_bal_success; /* we found long enough chunks */
1644 atomic_t s_bal_allocated; /* in blocks */
1645 atomic_t s_bal_ex_scanned; /* total extents scanned */
1646 atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */
1647 atomic_t s_bal_groups_scanned; /* number of groups scanned */
1648 atomic_t s_bal_goals; /* goal hits */
1649 atomic_t s_bal_len_goals; /* len goal hits */
1650 atomic_t s_bal_breaks; /* too long searches */
1651 atomic_t s_bal_2orders; /* 2^order hits */
1652 atomic_t s_bal_p2_aligned_bad_suggestions;
1653 atomic_t s_bal_goal_fast_bad_suggestions;
1654 atomic_t s_bal_best_avail_bad_suggestions;
1655 atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
1656 atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
1657 atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */
1658 atomic_t s_mb_buddies_generated; /* number of buddies generated */
1659 atomic64_t s_mb_generation_time;
1660 atomic_t s_mb_lost_chunks;
1661 atomic_t s_mb_preallocated;
1662 atomic_t s_mb_discarded;
1663 atomic_t s_lock_busy;
1664
1665 /* locality groups */
1666 struct ext4_locality_group __percpu *s_locality_groups;
1667
1668 /* for write statistics */
1669 unsigned long s_sectors_written_start;
1670 u64 s_kbytes_written;
1671
1672 /* the size of zero-out chunk */
1673 unsigned int s_extent_max_zeroout_kb;
1674
1675 unsigned int s_log_groups_per_flex;
1676 struct flex_groups * __rcu *s_flex_groups;
1677 ext4_group_t s_flex_groups_allocated;
1678
1679 /* workqueue for reserved extent conversions (buffered io) */
1680 struct workqueue_struct *rsv_conversion_wq;
1681
1682 /* timer for periodic error stats printing */
1683 struct timer_list s_err_report;
1684
1685 /* Lazy inode table initialization info */
1686 struct ext4_li_request *s_li_request;
1687 /* Wait multiplier for lazy initialization thread */
1688 unsigned int s_li_wait_mult;
1689
1690 /* Kernel thread for multiple mount protection */
1691 struct task_struct *s_mmp_tsk;
1692
1693 /* record the last minlen when FITRIM is called. */
1694 unsigned long s_last_trim_minblks;
1695
1696 /* Precomputed FS UUID checksum for seeding other checksums */
1697 __u32 s_csum_seed;
1698
1699 /* Reclaim extents from extent status tree */
1700 struct shrinker *s_es_shrinker;
1701 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1702 long s_es_nr_inode;
1703 struct ext4_es_stats s_es_stats;
1704 struct mb_cache *s_ea_block_cache;
1705 struct mb_cache *s_ea_inode_cache;
1706 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1707
1708 /* Journal triggers for checksum computation */
1709 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1710
1711 /* Ratelimit ext4 messages. */
1712 struct ratelimit_state s_err_ratelimit_state;
1713 struct ratelimit_state s_warning_ratelimit_state;
1714 struct ratelimit_state s_msg_ratelimit_state;
1715 atomic_t s_warning_count;
1716 atomic_t s_msg_count;
1717
1718 /* Encryption policy for '-o test_dummy_encryption' */
1719 struct fscrypt_dummy_policy s_dummy_enc_policy;
1720
1721 /*
1722 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1723 * or EXTENTS flag or between writepages ops and changing DELALLOC or
1724 * DIOREAD_NOLOCK mount options on remount.
1725 */
1726 struct percpu_rw_semaphore s_writepages_rwsem;
1727 struct dax_device *s_daxdev;
1728 u64 s_dax_part_off;
1729 #ifdef CONFIG_EXT4_DEBUG
1730 unsigned long s_simulate_fail;
1731 #endif
1732 /* Record the errseq of the backing block device */
1733 errseq_t s_bdev_wb_err;
1734 spinlock_t s_bdev_wb_lock;
1735
1736 /* Information about errors that happened during this mount */
1737 spinlock_t s_error_lock;
1738 int s_add_error_count;
1739 int s_first_error_code;
1740 __u32 s_first_error_line;
1741 __u32 s_first_error_ino;
1742 __u64 s_first_error_block;
1743 const char *s_first_error_func;
1744 time64_t s_first_error_time;
1745 int s_last_error_code;
1746 __u32 s_last_error_line;
1747 __u32 s_last_error_ino;
1748 __u64 s_last_error_block;
1749 const char *s_last_error_func;
1750 time64_t s_last_error_time;
1751 /*
1752 * If we are in a context where we cannot update the on-disk
1753 * superblock, we queue the work here. This is used to update
1754 * the error information in the superblock, and for periodic
1755 * updates of the superblock called from the commit callback
1756 * function.
1757 */
1758 struct work_struct s_sb_upd_work;
1759
1760 /* Atomic write unit values in bytes */
1761 unsigned int s_awu_min;
1762 unsigned int s_awu_max;
1763
1764 /* Ext4 fast commit sub transaction ID */
1765 atomic_t s_fc_subtid;
1766
1767 /*
1768 * After commit starts, the main queue gets locked, and the further
1769 * updates get added in the staging queue.
1770 */
1771 #define FC_Q_MAIN 0
1772 #define FC_Q_STAGING 1
1773 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1774 * that have data changes in them.
1775 */
1776 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1777 unsigned int s_fc_bytes;
1778 /*
1779 * Main fast commit lock. This lock protects accesses to the
1780 * following fields:
1781 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1782 */
1783 struct mutex s_fc_lock;
1784 struct buffer_head *s_fc_bh;
1785 struct ext4_fc_stats s_fc_stats;
1786 tid_t s_fc_ineligible_tid;
1787 #ifdef CONFIG_EXT4_DEBUG
1788 int s_fc_debug_max_replay;
1789 #endif
1790 struct ext4_fc_replay_state s_fc_replay_state;
1791 };
1792
EXT4_SB(struct super_block * sb)1793 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1794 {
1795 return sb->s_fs_info;
1796 }
EXT4_I(struct inode * inode)1797 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1798 {
1799 return container_of(inode, struct ext4_inode_info, vfs_inode);
1800 }
1801
ext4_writepages_down_read(struct super_block * sb)1802 static inline int ext4_writepages_down_read(struct super_block *sb)
1803 {
1804 percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
1805 return memalloc_nofs_save();
1806 }
1807
ext4_writepages_up_read(struct super_block * sb,int ctx)1808 static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
1809 {
1810 memalloc_nofs_restore(ctx);
1811 percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
1812 }
1813
ext4_writepages_down_write(struct super_block * sb)1814 static inline int ext4_writepages_down_write(struct super_block *sb)
1815 {
1816 percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
1817 return memalloc_nofs_save();
1818 }
1819
ext4_writepages_up_write(struct super_block * sb,int ctx)1820 static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
1821 {
1822 memalloc_nofs_restore(ctx);
1823 percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
1824 }
1825
ext4_valid_inum(struct super_block * sb,unsigned long ino)1826 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1827 {
1828 return ino == EXT4_ROOT_INO ||
1829 (ino >= EXT4_FIRST_INO(sb) &&
1830 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1831 }
1832
1833 /*
1834 * Returns: sbi->field[index]
1835 * Used to access an array element from the following sbi fields which require
1836 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1837 * - s_group_desc
1838 * - s_group_info
1839 * - s_flex_group
1840 */
1841 #define sbi_array_rcu_deref(sbi, field, index) \
1842 ({ \
1843 typeof(*((sbi)->field)) _v; \
1844 rcu_read_lock(); \
1845 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1846 rcu_read_unlock(); \
1847 _v; \
1848 })
1849
1850 /*
1851 * run-time mount flags
1852 */
1853 enum {
1854 EXT4_MF_MNTDIR_SAMPLED,
1855 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */
1856 EXT4_MF_JOURNAL_DESTROY /* Journal is in process of destroying */
1857 };
1858
ext4_set_mount_flag(struct super_block * sb,int bit)1859 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1860 {
1861 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1862 }
1863
ext4_clear_mount_flag(struct super_block * sb,int bit)1864 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1865 {
1866 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1867 }
1868
ext4_test_mount_flag(struct super_block * sb,int bit)1869 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1870 {
1871 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1872 }
1873
1874
1875 /*
1876 * Simulate_fail codes
1877 */
1878 #define EXT4_SIM_BBITMAP_EIO 1
1879 #define EXT4_SIM_BBITMAP_CRC 2
1880 #define EXT4_SIM_IBITMAP_EIO 3
1881 #define EXT4_SIM_IBITMAP_CRC 4
1882 #define EXT4_SIM_INODE_EIO 5
1883 #define EXT4_SIM_INODE_CRC 6
1884 #define EXT4_SIM_DIRBLOCK_EIO 7
1885 #define EXT4_SIM_DIRBLOCK_CRC 8
1886
ext4_simulate_fail(struct super_block * sb,unsigned long code)1887 static inline bool ext4_simulate_fail(struct super_block *sb,
1888 unsigned long code)
1889 {
1890 #ifdef CONFIG_EXT4_DEBUG
1891 struct ext4_sb_info *sbi = EXT4_SB(sb);
1892
1893 if (unlikely(sbi->s_simulate_fail == code)) {
1894 sbi->s_simulate_fail = 0;
1895 return true;
1896 }
1897 #endif
1898 return false;
1899 }
1900
1901 /*
1902 * Error number codes for s_{first,last}_error_errno
1903 *
1904 * Linux errno numbers are architecture specific, so we need to translate
1905 * them into something which is architecture independent. We don't define
1906 * codes for all errno's; just the ones which are most likely to be the cause
1907 * of an ext4_error() call.
1908 */
1909 #define EXT4_ERR_UNKNOWN 1
1910 #define EXT4_ERR_EIO 2
1911 #define EXT4_ERR_ENOMEM 3
1912 #define EXT4_ERR_EFSBADCRC 4
1913 #define EXT4_ERR_EFSCORRUPTED 5
1914 #define EXT4_ERR_ENOSPC 6
1915 #define EXT4_ERR_ENOKEY 7
1916 #define EXT4_ERR_EROFS 8
1917 #define EXT4_ERR_EFBIG 9
1918 #define EXT4_ERR_EEXIST 10
1919 #define EXT4_ERR_ERANGE 11
1920 #define EXT4_ERR_EOVERFLOW 12
1921 #define EXT4_ERR_EBUSY 13
1922 #define EXT4_ERR_ENOTDIR 14
1923 #define EXT4_ERR_ENOTEMPTY 15
1924 #define EXT4_ERR_ESHUTDOWN 16
1925 #define EXT4_ERR_EFAULT 17
1926
1927 /*
1928 * Inode dynamic state flags
1929 */
1930 enum {
1931 EXT4_STATE_NEW, /* inode is newly created */
1932 EXT4_STATE_XATTR, /* has in-inode xattrs */
1933 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1934 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1935 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1936 EXT4_STATE_NEWENTRY, /* File just added to dir */
1937 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1938 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1939 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1940 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1941 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1942 EXT4_STATE_FC_FLUSHING_DATA, /* Fast commit flushing data */
1943 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
1944 };
1945
1946 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1947 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1948 { \
1949 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1950 } \
1951 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1952 { \
1953 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1954 } \
1955 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1956 { \
1957 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1958 }
1959
1960 /* Add these declarations here only so that these functions can be
1961 * found by name. Otherwise, they are very hard to locate. */
1962 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1963 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1964 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1965 EXT4_INODE_BIT_FNS(flag, flags, 0)
1966
1967 /* Add these declarations here only so that these functions can be
1968 * found by name. Otherwise, they are very hard to locate. */
1969 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1970 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1971 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1972 #if (BITS_PER_LONG < 64)
1973 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1974
ext4_clear_state_flags(struct ext4_inode_info * ei)1975 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1976 {
1977 (ei)->i_state_flags = 0;
1978 }
1979 #else
1980 EXT4_INODE_BIT_FNS(state, flags, 32)
1981
ext4_clear_state_flags(struct ext4_inode_info * ei)1982 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1983 {
1984 /* We depend on the fact that callers will set i_flags */
1985 }
1986 #endif
1987 #else
1988 /* Assume that user mode programs are passing in an ext4fs superblock, not
1989 * a kernel struct super_block. This will allow us to call the feature-test
1990 * macros from user land. */
1991 #define EXT4_SB(sb) (sb)
1992 #endif
1993
ext4_verity_in_progress(struct inode * inode)1994 static inline bool ext4_verity_in_progress(struct inode *inode)
1995 {
1996 return IS_ENABLED(CONFIG_FS_VERITY) &&
1997 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1998 }
1999
2000 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
2001
2002 /*
2003 * Codes for operating systems
2004 */
2005 #define EXT4_OS_LINUX 0
2006 #define EXT4_OS_HURD 1
2007 #define EXT4_OS_MASIX 2
2008 #define EXT4_OS_FREEBSD 3
2009 #define EXT4_OS_LITES 4
2010
2011 /*
2012 * Revision levels
2013 */
2014 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
2015 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
2016
2017 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
2018
2019 #define EXT4_GOOD_OLD_INODE_SIZE 128
2020
2021 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
2022 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
2023 #define EXT4_TIMESTAMP_MIN S32_MIN
2024
2025 /*
2026 * Feature set definitions
2027 */
2028
2029 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
2030 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
2031 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
2032 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
2033 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
2034 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
2035 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
2036 /*
2037 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
2038 * incompatible only if fast commit blocks are present in the FS. Since we
2039 * clear the journal (and thus the fast commit blocks), we don't mark FS as
2040 * incompatible. We also have a JBD2 incompat feature, which gets set when
2041 * there are fast commit blocks present in the journal.
2042 */
2043 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
2044 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
2045 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
2046
2047 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
2048 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
2049 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
2050 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
2051 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
2052 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
2053 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
2054 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
2055 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
2056 /*
2057 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
2058 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2059 * all other data structures' checksums. However, the METADATA_CSUM and
2060 * GDT_CSUM bits are mutually exclusive.
2061 */
2062 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
2063 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
2064 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
2065 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
2066 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be
2067 non-empty */
2068
2069 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
2070 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
2071 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
2072 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
2073 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
2074 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
2075 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
2076 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
2077 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
2078 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
2079 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
2080 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
2081 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
2082 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
2083 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
2084 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
2085
2086 extern void ext4_update_dynamic_rev(struct super_block *sb);
2087
2088 #define EXT4_FEATURE_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_compat & \
2092 cpu_to_le32(EXT4_FEATURE_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_compat |= \
2098 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2099 } \
2100 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2101 { \
2102 EXT4_SB(sb)->s_es->s_feature_compat &= \
2103 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2104 }
2105
2106 #define EXT4_FEATURE_RO_COMPAT_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_ro_compat & \
2110 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##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_ro_compat |= \
2116 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2117 } \
2118 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2119 { \
2120 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2121 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2122 }
2123
2124 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2125 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2126 { \
2127 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2128 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2129 } \
2130 static inline void ext4_set_feature_##name(struct super_block *sb) \
2131 { \
2132 ext4_update_dynamic_rev(sb); \
2133 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2134 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2135 } \
2136 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2137 { \
2138 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2139 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2140 }
2141
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,DIR_PREALLOC)2142 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2143 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2144 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2145 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2146 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2147 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2148 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2149 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2150 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2151 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
2152
2153 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2154 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2155 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2156 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2157 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2158 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2159 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2160 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2161 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2162 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2163 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2164 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2165 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2166 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
2167
2168 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2169 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2170 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2171 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2172 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2173 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2174 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2175 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2176 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2177 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2178 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2179 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2180 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2181 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2182 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2183 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2184
2185 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2186 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2187 EXT4_FEATURE_INCOMPAT_META_BG)
2188 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2189 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2190 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2191
2192 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2193 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2194 EXT4_FEATURE_INCOMPAT_RECOVER| \
2195 EXT4_FEATURE_INCOMPAT_META_BG)
2196 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2197 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2198 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2199
2200 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2201 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2202 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2203 EXT4_FEATURE_INCOMPAT_RECOVER| \
2204 EXT4_FEATURE_INCOMPAT_META_BG| \
2205 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2206 EXT4_FEATURE_INCOMPAT_64BIT| \
2207 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2208 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2209 EXT4_FEATURE_INCOMPAT_MMP | \
2210 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2211 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2212 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2213 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2214 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2215 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2216 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2217 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2218 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2219 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2220 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2221 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2222 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2223 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2224 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2225 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2226 EXT4_FEATURE_RO_COMPAT_VERITY |\
2227 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2228
2229 #define EXTN_FEATURE_FUNCS(ver) \
2230 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2231 { \
2232 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2233 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2234 } \
2235 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2236 { \
2237 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2238 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2239 } \
2240 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2241 { \
2242 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2243 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2244 }
2245
2246 EXTN_FEATURE_FUNCS(2)
2247 EXTN_FEATURE_FUNCS(3)
2248 EXTN_FEATURE_FUNCS(4)
2249
2250 static inline bool ext4_has_compat_features(struct super_block *sb)
2251 {
2252 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2253 }
ext4_has_ro_compat_features(struct super_block * sb)2254 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2255 {
2256 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2257 }
ext4_has_incompat_features(struct super_block * sb)2258 static inline bool ext4_has_incompat_features(struct super_block *sb)
2259 {
2260 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2261 }
2262
2263 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2264
2265 /*
2266 * Superblock flags
2267 */
2268 enum {
2269 EXT4_FLAGS_RESIZING, /* Avoid superblock update and resize race */
2270 EXT4_FLAGS_SHUTDOWN, /* Prevent access to the file system */
2271 EXT4_FLAGS_BDEV_IS_DAX, /* Current block device support DAX */
2272 EXT4_FLAGS_EMERGENCY_RO,/* Emergency read-only due to fs errors */
2273 };
2274
ext4_forced_shutdown(struct super_block * sb)2275 static inline int ext4_forced_shutdown(struct super_block *sb)
2276 {
2277 return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
2278 }
2279
ext4_emergency_ro(struct super_block * sb)2280 static inline int ext4_emergency_ro(struct super_block *sb)
2281 {
2282 return test_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags);
2283 }
2284
ext4_emergency_state(struct super_block * sb)2285 static inline int ext4_emergency_state(struct super_block *sb)
2286 {
2287 if (unlikely(ext4_forced_shutdown(sb)))
2288 return -EIO;
2289 if (unlikely(ext4_emergency_ro(sb)))
2290 return -EROFS;
2291 return 0;
2292 }
2293
2294 /*
2295 * Default values for user and/or group using reserved blocks
2296 */
2297 #define EXT4_DEF_RESUID 0
2298 #define EXT4_DEF_RESGID 0
2299
2300 /*
2301 * Default project ID
2302 */
2303 #define EXT4_DEF_PROJID 0
2304
2305 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2306
2307 /*
2308 * Default mount options
2309 */
2310 #define EXT4_DEFM_DEBUG 0x0001
2311 #define EXT4_DEFM_BSDGROUPS 0x0002
2312 #define EXT4_DEFM_XATTR_USER 0x0004
2313 #define EXT4_DEFM_ACL 0x0008
2314 #define EXT4_DEFM_UID16 0x0010
2315 #define EXT4_DEFM_JMODE 0x0060
2316 #define EXT4_DEFM_JMODE_DATA 0x0020
2317 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2318 #define EXT4_DEFM_JMODE_WBACK 0x0060
2319 #define EXT4_DEFM_NOBARRIER 0x0100
2320 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2321 #define EXT4_DEFM_DISCARD 0x0400
2322 #define EXT4_DEFM_NODELALLOC 0x0800
2323
2324 /*
2325 * Default journal batch times and ioprio.
2326 */
2327 #define EXT4_DEF_MIN_BATCH_TIME 0
2328 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2329 #define EXT4_DEF_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
2330
2331
2332 /*
2333 * Default values for superblock update
2334 */
2335 #define EXT4_DEF_SB_UPDATE_INTERVAL_SEC (3600) /* seconds (1 hour) */
2336 #define EXT4_DEF_SB_UPDATE_INTERVAL_KB (16384) /* kilobytes (16MB) */
2337
2338
2339 /*
2340 * Minimum number of groups in a flexgroup before we separate out
2341 * directories into the first block group of a flexgroup
2342 */
2343 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2344
2345 /*
2346 * Structure of a directory entry
2347 */
2348 #define EXT4_NAME_LEN 255
2349 /*
2350 * Base length of the ext4 directory entry excluding the name length
2351 */
2352 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2353
2354 struct ext4_dir_entry {
2355 __le32 inode; /* Inode number */
2356 __le16 rec_len; /* Directory entry length */
2357 __le16 name_len; /* Name length */
2358 char name[EXT4_NAME_LEN]; /* File name */
2359 };
2360
2361
2362 /*
2363 * Encrypted Casefolded entries require saving the hash on disk. This structure
2364 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2365 * boundary.
2366 */
2367 struct ext4_dir_entry_hash {
2368 __le32 hash;
2369 __le32 minor_hash;
2370 };
2371
2372 /*
2373 * The new version of the directory entry. Since EXT4 structures are
2374 * stored in intel byte order, and the name_len field could never be
2375 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2376 * file_type field.
2377 */
2378 struct ext4_dir_entry_2 {
2379 __le32 inode; /* Inode number */
2380 __le16 rec_len; /* Directory entry length */
2381 __u8 name_len; /* Name length */
2382 __u8 file_type; /* See file type macros EXT4_FT_* below */
2383 char name[EXT4_NAME_LEN]; /* File name */
2384 };
2385
2386 /*
2387 * Access the hashes at the end of ext4_dir_entry_2
2388 */
2389 #define EXT4_DIRENT_HASHES(entry) \
2390 ((struct ext4_dir_entry_hash *) \
2391 (((void *)(entry)) + \
2392 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2393 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(entry)->hash)
2394 #define EXT4_DIRENT_MINOR_HASH(entry) \
2395 le32_to_cpu(EXT4_DIRENT_HASHES(entry)->minor_hash)
2396
ext4_hash_in_dirent(const struct inode * inode)2397 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2398 {
2399 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2400 }
2401
2402 /*
2403 * This is a bogus directory entry at the end of each leaf block that
2404 * records checksums.
2405 */
2406 struct ext4_dir_entry_tail {
2407 __le32 det_reserved_zero1; /* Pretend to be unused */
2408 __le16 det_rec_len; /* 12 */
2409 __u8 det_reserved_zero2; /* Zero name length */
2410 __u8 det_reserved_ft; /* 0xDE, fake file type */
2411 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2412 };
2413
2414 #define EXT4_DIRENT_TAIL(block, blocksize) \
2415 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2416 ((blocksize) - \
2417 sizeof(struct ext4_dir_entry_tail))))
2418
2419 /*
2420 * Ext4 directory file types. Only the low 3 bits are used. The
2421 * other bits are reserved for now.
2422 */
2423 #define EXT4_FT_UNKNOWN 0
2424 #define EXT4_FT_REG_FILE 1
2425 #define EXT4_FT_DIR 2
2426 #define EXT4_FT_CHRDEV 3
2427 #define EXT4_FT_BLKDEV 4
2428 #define EXT4_FT_FIFO 5
2429 #define EXT4_FT_SOCK 6
2430 #define EXT4_FT_SYMLINK 7
2431
2432 #define EXT4_FT_MAX 8
2433
2434 #define EXT4_FT_DIR_CSUM 0xDE
2435
2436 /*
2437 * EXT4_DIR_PAD defines the directory entries boundaries
2438 *
2439 * NOTE: It must be a multiple of 4
2440 */
2441 #define EXT4_DIR_PAD 4
2442 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2443 #define EXT4_MAX_REC_LEN ((1<<16)-1)
2444
2445 /*
2446 * The rec_len is dependent on the type of directory. Directories that are
2447 * casefolded and encrypted need to store the hash as well, so we add room for
2448 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2449 * pass NULL for dir, as those entries do not use the extra fields.
2450 */
ext4_dir_rec_len(__u8 name_len,const struct inode * dir)2451 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2452 const struct inode *dir)
2453 {
2454 int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2455
2456 if (dir && ext4_hash_in_dirent(dir))
2457 rec_len += sizeof(struct ext4_dir_entry_hash);
2458 return (rec_len & ~EXT4_DIR_ROUND);
2459 }
2460
2461 /*
2462 * If we ever get support for fs block sizes > page_size, we'll need
2463 * to remove the #if statements in the next two functions...
2464 */
2465 static inline unsigned int
ext4_rec_len_from_disk(__le16 dlen,unsigned blocksize)2466 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2467 {
2468 unsigned len = le16_to_cpu(dlen);
2469
2470 #if (PAGE_SIZE >= 65536)
2471 if (len == EXT4_MAX_REC_LEN || len == 0)
2472 return blocksize;
2473 return (len & 65532) | ((len & 3) << 16);
2474 #else
2475 return len;
2476 #endif
2477 }
2478
ext4_rec_len_to_disk(unsigned len,unsigned blocksize)2479 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2480 {
2481 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2482 #if (PAGE_SIZE >= 65536)
2483 if (len < 65536)
2484 return cpu_to_le16(len);
2485 if (len == blocksize) {
2486 if (blocksize == 65536)
2487 return cpu_to_le16(EXT4_MAX_REC_LEN);
2488 else
2489 return cpu_to_le16(0);
2490 }
2491 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2492 #else
2493 return cpu_to_le16(len);
2494 #endif
2495 }
2496
2497 /*
2498 * Hash Tree Directory indexing
2499 * (c) Daniel Phillips, 2001
2500 */
2501
2502 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2503 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2504 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2505 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2506 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2507
2508 /* Legal values for the dx_root hash_version field: */
2509
2510 #define DX_HASH_LEGACY 0
2511 #define DX_HASH_HALF_MD4 1
2512 #define DX_HASH_TEA 2
2513 #define DX_HASH_LEGACY_UNSIGNED 3
2514 #define DX_HASH_HALF_MD4_UNSIGNED 4
2515 #define DX_HASH_TEA_UNSIGNED 5
2516 #define DX_HASH_SIPHASH 6
2517 #define DX_HASH_LAST DX_HASH_SIPHASH
2518
ext4_chksum(u32 crc,const void * address,unsigned int length)2519 static inline u32 ext4_chksum(u32 crc, const void *address, unsigned int length)
2520 {
2521 return crc32c(crc, address, length);
2522 }
2523
2524 #ifdef __KERNEL__
2525
2526 /* hash info structure used by the directory hash */
2527 struct dx_hash_info
2528 {
2529 u32 hash;
2530 u32 minor_hash;
2531 int hash_version;
2532 u32 *seed;
2533 };
2534
2535
2536 /* 32 and 64 bit signed EOF for dx directories */
2537 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2538 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2539
2540
2541 /*
2542 * Control parameters used by ext4_htree_next_block
2543 */
2544 #define HASH_NB_ALWAYS 1
2545
2546 struct ext4_filename {
2547 const struct qstr *usr_fname;
2548 struct fscrypt_str disk_name;
2549 struct dx_hash_info hinfo;
2550 #ifdef CONFIG_FS_ENCRYPTION
2551 struct fscrypt_str crypto_buf;
2552 #endif
2553 #if IS_ENABLED(CONFIG_UNICODE)
2554 struct qstr cf_name;
2555 #endif
2556 };
2557
2558 #define fname_name(p) ((p)->disk_name.name)
2559 #define fname_usr_name(p) ((p)->usr_fname->name)
2560 #define fname_len(p) ((p)->disk_name.len)
2561
2562 /*
2563 * Describe an inode's exact location on disk and in memory
2564 */
2565 struct ext4_iloc
2566 {
2567 struct buffer_head *bh;
2568 unsigned long offset;
2569 ext4_group_t block_group;
2570 };
2571
ext4_raw_inode(struct ext4_iloc * iloc)2572 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2573 {
2574 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2575 }
2576
ext4_is_quota_file(struct inode * inode)2577 static inline bool ext4_is_quota_file(struct inode *inode)
2578 {
2579 return IS_NOQUOTA(inode) &&
2580 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2581 }
2582
2583 /*
2584 * This structure is stuffed into the struct file's private_data field
2585 * for directories. It is where we put information so that we can do
2586 * readdir operations in hash tree order.
2587 */
2588 struct dir_private_info {
2589 struct rb_root root;
2590 struct rb_node *curr_node;
2591 struct fname *extra_fname;
2592 loff_t last_pos;
2593 __u32 curr_hash;
2594 __u32 curr_minor_hash;
2595 __u32 next_hash;
2596 u64 cookie;
2597 bool initialized;
2598 };
2599
2600 /* calculate the first block number of the group */
2601 static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block * sb,ext4_group_t group_no)2602 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2603 {
2604 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2605 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2606 }
2607
2608 /*
2609 * Special error return code only used by dx_probe() and its callers.
2610 */
2611 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2612
2613 /* htree levels for ext4 */
2614 #define EXT4_HTREE_LEVEL_COMPAT 2
2615 #define EXT4_HTREE_LEVEL 3
2616
ext4_dir_htree_level(struct super_block * sb)2617 static inline int ext4_dir_htree_level(struct super_block *sb)
2618 {
2619 return ext4_has_feature_largedir(sb) ?
2620 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2621 }
2622
2623 /*
2624 * Timeout and state flag for lazy initialization inode thread.
2625 */
2626 #define EXT4_DEF_LI_WAIT_MULT 10
2627 #define EXT4_DEF_LI_MAX_START_DELAY 5
2628 #define EXT4_LAZYINIT_QUIT 0x0001
2629 #define EXT4_LAZYINIT_RUNNING 0x0002
2630
2631 /*
2632 * Lazy inode table initialization info
2633 */
2634 struct ext4_lazy_init {
2635 unsigned long li_state;
2636 struct list_head li_request_list;
2637 struct mutex li_list_mtx;
2638 };
2639
2640 enum ext4_li_mode {
2641 EXT4_LI_MODE_PREFETCH_BBITMAP,
2642 EXT4_LI_MODE_ITABLE,
2643 };
2644
2645 struct ext4_li_request {
2646 struct super_block *lr_super;
2647 enum ext4_li_mode lr_mode;
2648 ext4_group_t lr_first_not_zeroed;
2649 ext4_group_t lr_next_group;
2650 struct list_head lr_request;
2651 unsigned long lr_next_sched;
2652 unsigned long lr_timeout;
2653 };
2654
2655 struct ext4_features {
2656 struct kobject f_kobj;
2657 struct completion f_kobj_unregister;
2658 };
2659
2660 /*
2661 * This structure will be used for multiple mount protection. It will be
2662 * written into the block number saved in the s_mmp_block field in the
2663 * superblock. Programs that check MMP should assume that if
2664 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2665 * to use the filesystem, regardless of how old the timestamp is.
2666 */
2667 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2668 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2669 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2670 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2671
2672 struct mmp_struct {
2673 __le32 mmp_magic; /* Magic number for MMP */
2674 __le32 mmp_seq; /* Sequence no. updated periodically */
2675
2676 /*
2677 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2678 * purposes and do not affect the correctness of the algorithm
2679 */
2680 __le64 mmp_time; /* Time last updated */
2681 char mmp_nodename[64]; /* Node which last updated MMP block */
2682 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2683
2684 /*
2685 * mmp_check_interval is used to verify if the MMP block has been
2686 * updated on the block device. The value is updated based on the
2687 * maximum time to write the MMP block during an update cycle.
2688 */
2689 __le16 mmp_check_interval;
2690
2691 __le16 mmp_pad1;
2692 __le32 mmp_pad2[226];
2693 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2694 };
2695
2696 /* arguments passed to the mmp thread */
2697 struct mmpd_data {
2698 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2699 struct super_block *sb; /* super block of the fs */
2700 };
2701
2702 /*
2703 * Check interval multiplier
2704 * The MMP block is written every update interval and initially checked every
2705 * update interval x the multiplier (the value is then adapted based on the
2706 * write latency). The reason is that writes can be delayed under load and we
2707 * don't want readers to incorrectly assume that the filesystem is no longer
2708 * in use.
2709 */
2710 #define EXT4_MMP_CHECK_MULT 2UL
2711
2712 /*
2713 * Minimum interval for MMP checking in seconds.
2714 */
2715 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2716
2717 /*
2718 * Maximum interval for MMP checking in seconds.
2719 */
2720 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2721
2722 /*
2723 * Function prototypes
2724 */
2725
2726 /*
2727 * Ok, these declarations are also in <linux/kernel.h> but none of the
2728 * ext4 source programs needs to include it so they are duplicated here.
2729 */
2730 # define NORET_TYPE /**/
2731 # define ATTRIB_NORET __attribute__((noreturn))
2732 # define NORET_AND noreturn,
2733
2734 /* bitmap.c */
2735 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2736 void ext4_inode_bitmap_csum_set(struct super_block *sb,
2737 struct ext4_group_desc *gdp,
2738 struct buffer_head *bh);
2739 int ext4_inode_bitmap_csum_verify(struct super_block *sb,
2740 struct ext4_group_desc *gdp,
2741 struct buffer_head *bh);
2742 void ext4_block_bitmap_csum_set(struct super_block *sb,
2743 struct ext4_group_desc *gdp,
2744 struct buffer_head *bh);
2745 int ext4_block_bitmap_csum_verify(struct super_block *sb,
2746 struct ext4_group_desc *gdp,
2747 struct buffer_head *bh);
2748
2749 /* balloc.c */
2750 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2751 ext4_fsblk_t blocknr,
2752 ext4_group_t *blockgrpp,
2753 ext4_grpblk_t *offsetp);
2754 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2755 ext4_fsblk_t block);
2756
2757 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2758 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2759 ext4_group_t group);
2760 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2761 ext4_fsblk_t goal,
2762 unsigned int flags,
2763 unsigned long *count,
2764 int *errp);
2765 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2766 s64 nclusters, unsigned int flags);
2767 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2768 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2769 ext4_group_t block_group,
2770 struct buffer_head ** bh);
2771 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2772 ext4_group_t group);
2773 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2774
2775 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2776 ext4_group_t block_group,
2777 bool ignore_locked);
2778 extern int ext4_wait_block_bitmap(struct super_block *sb,
2779 ext4_group_t block_group,
2780 struct buffer_head *bh);
2781 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2782 ext4_group_t block_group);
2783 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2784 ext4_group_t block_group,
2785 struct ext4_group_desc *gdp);
2786 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2787
2788 #if IS_ENABLED(CONFIG_UNICODE)
2789 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2790 const struct qstr *iname,
2791 struct ext4_filename *fname);
2792
ext4_fname_free_ci_filename(struct ext4_filename * fname)2793 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2794 {
2795 kfree(fname->cf_name.name);
2796 fname->cf_name.name = NULL;
2797 }
2798 #else
ext4_fname_setup_ci_filename(struct inode * dir,const struct qstr * iname,struct ext4_filename * fname)2799 static inline int ext4_fname_setup_ci_filename(struct inode *dir,
2800 const struct qstr *iname,
2801 struct ext4_filename *fname)
2802 {
2803 return 0;
2804 }
2805
ext4_fname_free_ci_filename(struct ext4_filename * fname)2806 static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
2807 {
2808 }
2809 #endif
2810
2811 /* ext4 encryption related stuff goes here crypto.c */
2812 #ifdef CONFIG_FS_ENCRYPTION
2813 extern const struct fscrypt_operations ext4_cryptops;
2814
2815 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2816 int lookup, struct ext4_filename *fname);
2817
2818 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2819 struct ext4_filename *fname);
2820
2821 void ext4_fname_free_filename(struct ext4_filename *fname);
2822
2823 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2824
2825 #else /* !CONFIG_FS_ENCRYPTION */
ext4_fname_setup_filename(struct inode * dir,const struct qstr * iname,int lookup,struct ext4_filename * fname)2826 static inline int ext4_fname_setup_filename(struct inode *dir,
2827 const struct qstr *iname,
2828 int lookup,
2829 struct ext4_filename *fname)
2830 {
2831 fname->usr_fname = iname;
2832 fname->disk_name.name = (unsigned char *) iname->name;
2833 fname->disk_name.len = iname->len;
2834
2835 return ext4_fname_setup_ci_filename(dir, iname, fname);
2836 }
2837
ext4_fname_prepare_lookup(struct inode * dir,struct dentry * dentry,struct ext4_filename * fname)2838 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2839 struct dentry *dentry,
2840 struct ext4_filename *fname)
2841 {
2842 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2843 }
2844
ext4_fname_free_filename(struct ext4_filename * fname)2845 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2846 {
2847 ext4_fname_free_ci_filename(fname);
2848 }
2849
ext4_ioctl_get_encryption_pwsalt(struct file * filp,void __user * arg)2850 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2851 void __user *arg)
2852 {
2853 return -EOPNOTSUPP;
2854 }
2855 #endif /* !CONFIG_FS_ENCRYPTION */
2856
2857 /* dir.c */
2858 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2859 struct file *,
2860 struct ext4_dir_entry_2 *,
2861 struct buffer_head *, char *, int,
2862 unsigned int);
2863 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2864 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2865 (de), (bh), (buf), (size), (offset)))
2866 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2867 __u32 minor_hash,
2868 struct ext4_dir_entry_2 *dirent,
2869 struct fscrypt_str *ent_name);
2870 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2871 extern int ext4_find_dest_de(struct inode *dir, struct buffer_head *bh,
2872 void *buf, int buf_size,
2873 struct ext4_filename *fname,
2874 struct ext4_dir_entry_2 **dest_de);
2875 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2876 struct ext4_dir_entry_2 *de,
2877 int buf_size,
2878 struct ext4_filename *fname);
ext4_update_dx_flag(struct inode * inode)2879 static inline void ext4_update_dx_flag(struct inode *inode)
2880 {
2881 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2882 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2883 /* ext4_iget() should have caught this... */
2884 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2885 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2886 }
2887 }
2888 static const unsigned char ext4_filetype_table[] = {
2889 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2890 };
2891
get_dtype(struct super_block * sb,int filetype)2892 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2893 {
2894 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2895 return DT_UNKNOWN;
2896
2897 return ext4_filetype_table[filetype];
2898 }
2899 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2900 void *buf, int buf_size);
2901
2902 /* fsync.c */
2903 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2904
2905 /* hash.c */
2906 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2907 struct dx_hash_info *hinfo);
2908
2909 /* ialloc.c */
2910 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2911 extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,
2912 struct inode *, umode_t,
2913 const struct qstr *qstr, __u32 goal,
2914 uid_t *owner, __u32 i_flags,
2915 int handle_type, unsigned int line_no,
2916 int nblocks);
2917
2918 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2919 __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \
2920 (goal), (owner), i_flags, 0, 0, 0)
2921 #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
2922 type, nblocks) \
2923 __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
2924 0, (type), __LINE__, (nblocks))
2925
2926
2927 extern void ext4_free_inode(handle_t *, struct inode *);
2928 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2929 extern unsigned long ext4_count_free_inodes(struct super_block *);
2930 extern unsigned long ext4_count_dirs(struct super_block *);
2931 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2932 extern int ext4_init_inode_table(struct super_block *sb,
2933 ext4_group_t group, int barrier);
2934 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2935
2936 /* fast_commit.c */
2937 int ext4_fc_info_show(struct seq_file *seq, void *v);
2938 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2939 void ext4_fc_init_inode(struct inode *inode);
2940 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2941 ext4_lblk_t end);
2942 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2943 struct dentry *dentry);
2944 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2945 struct dentry *dentry);
2946 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2947 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2948 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2949 struct dentry *dentry);
2950 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2951 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2952 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2953 void ext4_fc_del(struct inode *inode);
2954 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2955 void ext4_fc_replay_cleanup(struct super_block *sb);
2956 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2957 int __init ext4_fc_init_dentry_cache(void);
2958 void ext4_fc_destroy_dentry_cache(void);
2959 int ext4_fc_record_regions(struct super_block *sb, int ino,
2960 ext4_lblk_t lblk, ext4_fsblk_t pblk,
2961 int len, int replay);
2962
2963 /* mballoc.c */
2964 extern const struct seq_operations ext4_mb_seq_groups_ops;
2965 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2966 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2967 extern int ext4_mb_init(struct super_block *);
2968 extern void ext4_mb_release(struct super_block *);
2969 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2970 struct ext4_allocation_request *, int *);
2971 extern void ext4_discard_preallocations(struct inode *);
2972 extern int __init ext4_init_mballoc(void);
2973 extern void ext4_exit_mballoc(void);
2974 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2975 ext4_group_t group,
2976 unsigned int nr, int *cnt);
2977 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2978 unsigned int nr);
2979
2980 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2981 struct buffer_head *bh, ext4_fsblk_t block,
2982 unsigned long count, int flags);
2983 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2984 ext4_group_t ngroups);
2985 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2986 ext4_group_t i, struct ext4_group_desc *desc);
2987 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2988 ext4_fsblk_t block, unsigned long count);
2989 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2990 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2991 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2992 int len, bool state);
ext4_mb_cr_expensive(enum criteria cr)2993 static inline bool ext4_mb_cr_expensive(enum criteria cr)
2994 {
2995 return cr >= CR_GOAL_LEN_SLOW;
2996 }
2997
2998 /* inode.c */
2999 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
3000 struct ext4_inode_info *ei);
3001 int ext4_inode_is_fast_symlink(struct inode *inode);
3002 void ext4_check_map_extents_env(struct inode *inode);
3003 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
3004 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
3005 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
3006 bool wait, struct buffer_head **bhs);
3007 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
3008 struct buffer_head *bh_result, int create);
3009 int ext4_get_block(struct inode *inode, sector_t iblock,
3010 struct buffer_head *bh_result, int create);
3011 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
3012 struct buffer_head *bh, int create);
3013 int ext4_walk_page_buffers(handle_t *handle,
3014 struct inode *inode,
3015 struct buffer_head *head,
3016 unsigned from,
3017 unsigned to,
3018 int *partial,
3019 int (*fn)(handle_t *handle, struct inode *inode,
3020 struct buffer_head *bh));
3021 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
3022 struct buffer_head *bh);
3023 bool ext4_should_enable_large_folio(struct inode *inode);
3024 #define FALL_BACK_TO_NONDELALLOC 1
3025 #define CONVERT_INLINE_DATA 2
3026
3027 typedef enum {
3028 EXT4_IGET_NORMAL = 0,
3029 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
3030 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */
3031 EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */
3032 EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */
3033 } ext4_iget_flags;
3034
3035 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
3036 ext4_iget_flags flags, const char *function,
3037 unsigned int line);
3038
3039 #define ext4_iget(sb, ino, flags) \
3040 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
3041
3042 extern int ext4_write_inode(struct inode *, struct writeback_control *);
3043 extern int ext4_setattr(struct mnt_idmap *, struct dentry *,
3044 struct iattr *);
3045 extern u32 ext4_dio_alignment(struct inode *inode);
3046 extern int ext4_getattr(struct mnt_idmap *, const struct path *,
3047 struct kstat *, u32, unsigned int);
3048 extern void ext4_evict_inode(struct inode *);
3049 extern void ext4_clear_inode(struct inode *);
3050 extern int ext4_file_getattr(struct mnt_idmap *, const struct path *,
3051 struct kstat *, u32, unsigned int);
3052 extern void ext4_dirty_inode(struct inode *, int);
3053 extern int ext4_change_inode_journal_flag(struct inode *, int);
3054 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
3055 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
3056 struct ext4_iloc *iloc);
3057 extern int ext4_inode_attach_jinode(struct inode *inode);
3058 extern int ext4_can_truncate(struct inode *inode);
3059 extern int ext4_truncate(struct inode *);
3060 extern int ext4_break_layouts(struct inode *);
3061 extern int ext4_truncate_page_cache_block_range(struct inode *inode,
3062 loff_t start, loff_t end);
3063 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
3064 extern void ext4_set_inode_flags(struct inode *, bool init);
3065 extern int ext4_alloc_da_blocks(struct inode *inode);
3066 extern void ext4_set_aops(struct inode *inode);
3067 extern int ext4_writepage_trans_blocks(struct inode *);
3068 extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
3069 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
3070 extern int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
3071 int pextents);
3072 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
3073 loff_t lstart, loff_t lend);
3074 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3075 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3076 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3077 extern void ext4_da_release_space(struct inode *inode, int to_free);
3078 extern void ext4_da_update_reserve_space(struct inode *inode,
3079 int used, int quota_claim);
3080 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3081 ext4_fsblk_t pblk, ext4_lblk_t len);
3082
is_special_ino(struct super_block * sb,unsigned long ino)3083 static inline bool is_special_ino(struct super_block *sb, unsigned long ino)
3084 {
3085 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3086
3087 return (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) ||
3088 ino == le32_to_cpu(es->s_usr_quota_inum) ||
3089 ino == le32_to_cpu(es->s_grp_quota_inum) ||
3090 ino == le32_to_cpu(es->s_prj_quota_inum) ||
3091 ino == le32_to_cpu(es->s_orphan_file_inum);
3092 }
3093
3094 /* indirect.c */
3095 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3096 struct ext4_map_blocks *map, int flags);
3097 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3098 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3099 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3100 ext4_lblk_t start, ext4_lblk_t end);
3101
3102 /* ioctl.c */
3103 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3104 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3105 int ext4_fileattr_set(struct mnt_idmap *idmap,
3106 struct dentry *dentry, struct file_kattr *fa);
3107 int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa);
3108 extern void ext4_reset_inode_seed(struct inode *inode);
3109 int ext4_update_overhead(struct super_block *sb, bool force);
3110 int ext4_force_shutdown(struct super_block *sb, u32 flags);
3111
3112 /* migrate.c */
3113 extern int ext4_ext_migrate(struct inode *);
3114 extern int ext4_ind_migrate(struct inode *inode);
3115
3116 /* namei.c */
3117 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3118 struct inode *inode);
3119 extern int ext4_dirblock_csum_verify(struct inode *inode,
3120 struct buffer_head *bh);
3121 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3122 __u32 start_minor_hash, __u32 *next_hash);
3123 extern int ext4_search_dir(struct buffer_head *bh,
3124 char *search_buf,
3125 int buf_size,
3126 struct inode *dir,
3127 struct ext4_filename *fname,
3128 unsigned int offset,
3129 struct ext4_dir_entry_2 **res_dir);
3130 extern int ext4_generic_delete_entry(struct inode *dir,
3131 struct ext4_dir_entry_2 *de_del,
3132 struct buffer_head *bh,
3133 void *entry_buf,
3134 int buf_size,
3135 int csum_size);
3136 extern bool ext4_empty_dir(struct inode *inode);
3137
3138 /* resize.c */
3139 extern void ext4_kvfree_array_rcu(void *to_free);
3140 extern int ext4_group_add(struct super_block *sb,
3141 struct ext4_new_group_data *input);
3142 extern int ext4_group_extend(struct super_block *sb,
3143 struct ext4_super_block *es,
3144 ext4_fsblk_t n_blocks_count);
3145 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3146 extern unsigned int ext4_list_backups(struct super_block *sb,
3147 unsigned int *three, unsigned int *five,
3148 unsigned int *seven);
3149
3150 /* super.c */
3151 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3152 sector_t block, blk_opf_t op_flags);
3153 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3154 sector_t block);
3155 extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3156 bh_end_io_t *end_io, bool simu_fail);
3157 extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3158 bh_end_io_t *end_io, bool simu_fail);
3159 extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3160 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3161 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3162 extern int ext4_calculate_overhead(struct super_block *sb);
3163 extern __le32 ext4_superblock_csum(struct ext4_super_block *es);
3164 extern void ext4_superblock_csum_set(struct super_block *sb);
3165 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3166 ext4_group_t ngroup);
3167 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3168 char nbuf[16]);
3169 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3170 ext4_group_t block_group,
3171 unsigned int flags);
3172 extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb,
3173 ext4_group_t block_group);
3174
3175 extern __printf(7, 8)
3176 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3177 int, __u64, const char *, ...);
3178 extern __printf(6, 7)
3179 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3180 ext4_fsblk_t, int, const char *, ...);
3181 extern __printf(5, 6)
3182 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3183 const char *, ...);
3184 extern void __ext4_std_error(struct super_block *, const char *,
3185 unsigned int, int);
3186 extern __printf(4, 5)
3187 void __ext4_warning(struct super_block *, const char *, unsigned int,
3188 const char *, ...);
3189 extern __printf(4, 5)
3190 void __ext4_warning_inode(const struct inode *inode, const char *function,
3191 unsigned int line, const char *fmt, ...);
3192 extern __printf(3, 4)
3193 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3194 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3195 const char *, unsigned int, const char *);
3196 extern __printf(7, 8)
3197 void __ext4_grp_locked_error(const char *, unsigned int,
3198 struct super_block *, ext4_group_t,
3199 unsigned long, ext4_fsblk_t,
3200 const char *, ...);
3201
3202 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3203 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3204
3205 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3206 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3207
3208 #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3209 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3210 (fmt), ## a)
3211
3212 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3213 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3214
3215 #define ext4_abort(sb, err, fmt, a...) \
3216 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3217
3218 #ifdef CONFIG_PRINTK
3219
3220 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3221 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3222 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3223 __ext4_error_inode((inode), (func), (line), (block), \
3224 (err), (fmt), ##__VA_ARGS__)
3225 #define ext4_error_file(file, func, line, block, fmt, ...) \
3226 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3227 #define ext4_error(sb, fmt, ...) \
3228 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3229 ##__VA_ARGS__)
3230 #define ext4_error_err(sb, err, fmt, ...) \
3231 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3232 ##__VA_ARGS__)
3233 #define ext4_warning(sb, fmt, ...) \
3234 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3235 #define ext4_warning_inode(inode, fmt, ...) \
3236 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3237 #define ext4_msg(sb, level, fmt, ...) \
3238 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3239 #define dump_mmp_msg(sb, mmp, msg) \
3240 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3241 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3242 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3243 fmt, ##__VA_ARGS__)
3244
3245 #else
3246
3247 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3248 do { \
3249 no_printk(fmt, ##__VA_ARGS__); \
3250 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3251 } while (0)
3252 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3253 do { \
3254 no_printk(fmt, ##__VA_ARGS__); \
3255 __ext4_error_inode(inode, "", 0, block, err, " "); \
3256 } while (0)
3257 #define ext4_error_file(file, func, line, block, fmt, ...) \
3258 do { \
3259 no_printk(fmt, ##__VA_ARGS__); \
3260 __ext4_error_file(file, "", 0, block, " "); \
3261 } while (0)
3262 #define ext4_error(sb, fmt, ...) \
3263 do { \
3264 no_printk(fmt, ##__VA_ARGS__); \
3265 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3266 } while (0)
3267 #define ext4_error_err(sb, err, fmt, ...) \
3268 do { \
3269 no_printk(fmt, ##__VA_ARGS__); \
3270 __ext4_error(sb, "", 0, false, err, 0, " "); \
3271 } while (0)
3272 #define ext4_warning(sb, fmt, ...) \
3273 do { \
3274 no_printk(fmt, ##__VA_ARGS__); \
3275 __ext4_warning(sb, "", 0, " "); \
3276 } while (0)
3277 #define ext4_warning_inode(inode, fmt, ...) \
3278 do { \
3279 no_printk(fmt, ##__VA_ARGS__); \
3280 __ext4_warning_inode(inode, "", 0, " "); \
3281 } while (0)
3282 #define ext4_msg(sb, level, fmt, ...) \
3283 do { \
3284 no_printk(fmt, ##__VA_ARGS__); \
3285 __ext4_msg(sb, "", " "); \
3286 } while (0)
3287 #define dump_mmp_msg(sb, mmp, msg) \
3288 __dump_mmp_msg(sb, mmp, "", 0, "")
3289 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3290 do { \
3291 no_printk(fmt, ##__VA_ARGS__); \
3292 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3293 } while (0)
3294
3295 #endif
3296
3297 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3298 struct ext4_group_desc *bg);
3299 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3300 struct ext4_group_desc *bg);
3301 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3302 struct ext4_group_desc *bg);
3303 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3304 struct ext4_group_desc *bg);
3305 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3306 struct ext4_group_desc *bg);
3307 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3308 struct ext4_group_desc *bg);
3309 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3310 struct ext4_group_desc *bg);
3311 extern void ext4_block_bitmap_set(struct super_block *sb,
3312 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3313 extern void ext4_inode_bitmap_set(struct super_block *sb,
3314 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3315 extern void ext4_inode_table_set(struct super_block *sb,
3316 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3317 extern void ext4_free_group_clusters_set(struct super_block *sb,
3318 struct ext4_group_desc *bg,
3319 __u32 count);
3320 extern void ext4_free_inodes_set(struct super_block *sb,
3321 struct ext4_group_desc *bg, __u32 count);
3322 extern void ext4_used_dirs_set(struct super_block *sb,
3323 struct ext4_group_desc *bg, __u32 count);
3324 extern void ext4_itable_unused_set(struct super_block *sb,
3325 struct ext4_group_desc *bg, __u32 count);
3326 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3327 struct ext4_group_desc *gdp);
3328 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3329 struct ext4_group_desc *gdp);
3330 extern int ext4_register_li_request(struct super_block *sb,
3331 ext4_group_t first_not_zeroed);
3332
ext4_has_group_desc_csum(struct super_block * sb)3333 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3334 {
3335 return ext4_has_feature_gdt_csum(sb) ||
3336 ext4_has_feature_metadata_csum(sb);
3337 }
3338
3339 #define ext4_read_incompat_64bit_val(es, name) \
3340 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3341 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3342 le32_to_cpu(es->name##_lo))
3343
ext4_blocks_count(struct ext4_super_block * es)3344 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3345 {
3346 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3347 }
3348
ext4_r_blocks_count(struct ext4_super_block * es)3349 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3350 {
3351 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3352 }
3353
ext4_free_blocks_count(struct ext4_super_block * es)3354 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3355 {
3356 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3357 }
3358
ext4_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3359 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3360 ext4_fsblk_t blk)
3361 {
3362 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3363 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3364 }
3365
ext4_free_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3366 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3367 ext4_fsblk_t blk)
3368 {
3369 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3370 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3371 }
3372
ext4_r_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3373 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3374 ext4_fsblk_t blk)
3375 {
3376 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3377 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3378 }
3379
ext4_isize(struct super_block * sb,struct ext4_inode * raw_inode)3380 static inline loff_t ext4_isize(struct super_block *sb,
3381 struct ext4_inode *raw_inode)
3382 {
3383 if (ext4_has_feature_largedir(sb) ||
3384 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3385 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3386 le32_to_cpu(raw_inode->i_size_lo);
3387
3388 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3389 }
3390
ext4_isize_set(struct ext4_inode * raw_inode,loff_t i_size)3391 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3392 {
3393 raw_inode->i_size_lo = cpu_to_le32(i_size);
3394 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3395 }
3396
3397 /*
3398 * Reading s_groups_count requires using smp_rmb() afterwards. See
3399 * the locking protocol documented in the comments of ext4_group_add()
3400 * in resize.c
3401 */
ext4_get_groups_count(struct super_block * sb)3402 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3403 {
3404 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3405
3406 smp_rmb();
3407 return ngroups;
3408 }
3409
ext4_flex_group(struct ext4_sb_info * sbi,ext4_group_t block_group)3410 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3411 ext4_group_t block_group)
3412 {
3413 return block_group >> sbi->s_log_groups_per_flex;
3414 }
3415
ext4_flex_bg_size(struct ext4_sb_info * sbi)3416 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3417 {
3418 return 1 << sbi->s_log_groups_per_flex;
3419 }
3420
ext4_get_maxbytes(struct inode * inode)3421 static inline loff_t ext4_get_maxbytes(struct inode *inode)
3422 {
3423 if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
3424 return inode->i_sb->s_maxbytes;
3425 return EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
3426 }
3427
3428 #define ext4_std_error(sb, errno) \
3429 do { \
3430 if ((errno)) \
3431 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3432 } while (0)
3433
3434 #ifdef CONFIG_SMP
3435 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3436 * counters. So we need to make sure we have free clusters more
3437 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3438 */
3439 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3440 #else
3441 #define EXT4_FREECLUSTERS_WATERMARK 0
3442 #endif
3443
3444 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_i_disksize(struct inode * inode,loff_t newsize)3445 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3446 {
3447 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3448 !inode_is_locked(inode));
3449 down_write(&EXT4_I(inode)->i_data_sem);
3450 if (newsize > EXT4_I(inode)->i_disksize)
3451 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3452 up_write(&EXT4_I(inode)->i_data_sem);
3453 }
3454
3455 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_inode_size(struct inode * inode,loff_t newsize)3456 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3457 {
3458 int changed = 0;
3459
3460 if (newsize > inode->i_size) {
3461 i_size_write(inode, newsize);
3462 changed = 1;
3463 }
3464 if (newsize > EXT4_I(inode)->i_disksize) {
3465 ext4_update_i_disksize(inode, newsize);
3466 changed |= 2;
3467 }
3468 return changed;
3469 }
3470
3471 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3472 loff_t len);
3473
3474 struct ext4_group_info {
3475 unsigned long bb_state;
3476 #ifdef AGGRESSIVE_CHECK
3477 unsigned long bb_check_counter;
3478 #endif
3479 struct rb_root bb_free_root;
3480 ext4_grpblk_t bb_first_free; /* first free block */
3481 ext4_grpblk_t bb_free; /* total free blocks */
3482 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3483 int bb_avg_fragment_size_order; /* order of average
3484 fragment in BG */
3485 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3486 ext4_group_t bb_group; /* Group number */
3487 struct list_head bb_prealloc_list;
3488 #ifdef DOUBLE_CHECK
3489 void *bb_bitmap;
3490 #endif
3491 struct rw_semaphore alloc_sem;
3492 struct list_head bb_avg_fragment_size_node;
3493 struct list_head bb_largest_free_order_node;
3494 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3495 * regions, index is order.
3496 * bb_counters[3] = 5 means
3497 * 5 free 8-block regions. */
3498 };
3499
3500 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3501 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3502 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3503 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3504 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3505 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3506 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3507 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3508 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3509
3510 #define EXT4_MB_GRP_NEED_INIT(grp) \
3511 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3512 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3513 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3514 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3515 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3516
3517 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3518 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3519 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3520 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3521 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3522 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3523 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3524 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3525
3526 #define EXT4_MAX_CONTENTION 8
3527 #define EXT4_CONTENTION_THRESHOLD 2
3528
ext4_group_lock_ptr(struct super_block * sb,ext4_group_t group)3529 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3530 ext4_group_t group)
3531 {
3532 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3533 }
3534
3535 /*
3536 * Returns true if the filesystem is busy enough that attempts to
3537 * access the block group locks has run into contention.
3538 */
ext4_fs_is_busy(struct ext4_sb_info * sbi)3539 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3540 {
3541 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3542 }
3543
ext4_lock_group(struct super_block * sb,ext4_group_t group)3544 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3545 {
3546 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3547 if (spin_trylock(lock))
3548 /*
3549 * We're able to grab the lock right away, so drop the
3550 * lock contention counter.
3551 */
3552 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3553 else {
3554 /*
3555 * The lock is busy, so bump the contention counter,
3556 * and then wait on the spin lock.
3557 */
3558 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3559 EXT4_MAX_CONTENTION);
3560 spin_lock(lock);
3561 }
3562 }
3563
ext4_unlock_group(struct super_block * sb,ext4_group_t group)3564 static inline void ext4_unlock_group(struct super_block *sb,
3565 ext4_group_t group)
3566 {
3567 spin_unlock(ext4_group_lock_ptr(sb, group));
3568 }
3569
3570 #ifdef CONFIG_QUOTA
ext4_quota_capable(struct super_block * sb)3571 static inline bool ext4_quota_capable(struct super_block *sb)
3572 {
3573 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3574 }
3575
ext4_is_quota_journalled(struct super_block * sb)3576 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3577 {
3578 struct ext4_sb_info *sbi = EXT4_SB(sb);
3579
3580 return (ext4_has_feature_quota(sb) ||
3581 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3582 }
3583 int ext4_enable_quotas(struct super_block *sb);
3584 #endif
3585
3586 /*
3587 * Block validity checking
3588 */
3589 #define ext4_check_indirect_blockref(inode, bh) \
3590 ext4_check_blockref(__func__, __LINE__, inode, \
3591 (__le32 *)(bh)->b_data, \
3592 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3593
3594 #define ext4_ind_check_inode(inode) \
3595 ext4_check_blockref(__func__, __LINE__, inode, \
3596 EXT4_I(inode)->i_data, \
3597 EXT4_NDIR_BLOCKS)
3598
3599 /*
3600 * Inodes and files operations
3601 */
3602
3603 /* dir.c */
3604 extern const struct file_operations ext4_dir_operations;
3605
3606 /* file.c */
3607 extern const struct inode_operations ext4_file_inode_operations;
3608 extern const struct file_operations ext4_file_operations;
3609 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3610
3611 /* inline.c */
3612 extern int ext4_get_max_inline_size(struct inode *inode);
3613 extern int ext4_find_inline_data_nolock(struct inode *inode);
3614 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3615
3616 int ext4_readpage_inline(struct inode *inode, struct folio *folio);
3617 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3618 struct inode *inode,
3619 loff_t pos, unsigned len,
3620 struct folio **foliop);
3621 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
3622 unsigned copied, struct folio *folio);
3623 extern int ext4_generic_write_inline_data(struct address_space *mapping,
3624 struct inode *inode,
3625 loff_t pos, unsigned len,
3626 struct folio **foliop,
3627 void **fsdata, bool da);
3628 extern int ext4_try_add_inline_entry(handle_t *handle,
3629 struct ext4_filename *fname,
3630 struct inode *dir, struct inode *inode);
3631 extern int ext4_try_create_inline_dir(handle_t *handle,
3632 struct inode *parent,
3633 struct inode *inode);
3634 extern int ext4_read_inline_dir(struct file *filp,
3635 struct dir_context *ctx,
3636 int *has_inline_data);
3637 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3638 struct inode *dir, ext4_lblk_t block,
3639 struct dx_hash_info *hinfo,
3640 __u32 start_hash, __u32 start_minor_hash,
3641 int *has_inline_data);
3642 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3643 struct ext4_filename *fname,
3644 struct ext4_dir_entry_2 **res_dir,
3645 int *has_inline_data);
3646 extern int ext4_delete_inline_entry(handle_t *handle,
3647 struct inode *dir,
3648 struct ext4_dir_entry_2 *de_del,
3649 struct buffer_head *bh,
3650 int *has_inline_data);
3651 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3652 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3653 struct ext4_dir_entry_2 **parent_de,
3654 int *retval);
3655 extern void *ext4_read_inline_link(struct inode *inode);
3656
3657 struct iomap;
3658 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3659
3660 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3661
3662 extern int ext4_convert_inline_data(struct inode *inode);
3663
ext4_has_inline_data(struct inode * inode)3664 static inline int ext4_has_inline_data(struct inode *inode)
3665 {
3666 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3667 EXT4_I(inode)->i_inline_off;
3668 }
3669
3670 /* namei.c */
3671 extern const struct inode_operations ext4_dir_inode_operations;
3672 extern const struct inode_operations ext4_special_inode_operations;
3673 extern struct dentry *ext4_get_parent(struct dentry *child);
3674 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3675 struct ext4_dir_entry_2 *de,
3676 int blocksize, int csum_size,
3677 unsigned int parent_ino, int dotdot_real_len);
3678 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3679 unsigned int blocksize);
3680 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3681 struct buffer_head *bh);
3682 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3683 struct inode *inode, struct dentry *dentry);
3684 extern int __ext4_link(struct inode *dir, struct inode *inode,
3685 struct dentry *dentry);
3686
3687 #define S_SHIFT 12
3688 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3689 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3690 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3691 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3692 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3693 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3694 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3695 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3696 };
3697
ext4_set_de_type(struct super_block * sb,struct ext4_dir_entry_2 * de,umode_t mode)3698 static inline void ext4_set_de_type(struct super_block *sb,
3699 struct ext4_dir_entry_2 *de,
3700 umode_t mode) {
3701 if (ext4_has_feature_filetype(sb))
3702 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3703 }
3704
3705 /* readpages.c */
3706 extern int ext4_mpage_readpages(struct inode *inode,
3707 struct readahead_control *rac, struct folio *folio);
3708 extern int __init ext4_init_post_read_processing(void);
3709 extern void ext4_exit_post_read_processing(void);
3710
3711 /* symlink.c */
3712 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3713 extern const struct inode_operations ext4_symlink_inode_operations;
3714 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3715
3716 /* sysfs.c */
3717 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3718 extern int ext4_register_sysfs(struct super_block *sb);
3719 extern void ext4_unregister_sysfs(struct super_block *sb);
3720 extern int __init ext4_init_sysfs(void);
3721 extern void ext4_exit_sysfs(void);
3722
3723 /* block_validity */
3724 extern void ext4_release_system_zone(struct super_block *sb);
3725 extern int ext4_setup_system_zone(struct super_block *sb);
3726 extern int __init ext4_init_system_zone(void);
3727 extern void ext4_exit_system_zone(void);
3728 extern int ext4_inode_block_valid(struct inode *inode,
3729 ext4_fsblk_t start_blk,
3730 unsigned int count);
3731 extern int ext4_check_blockref(const char *, unsigned int,
3732 struct inode *, __le32 *, unsigned int);
3733 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3734 ext4_fsblk_t start_blk, unsigned int count);
3735
3736
3737 /* extents.c */
3738 struct ext4_ext_path;
3739 struct ext4_extent;
3740
3741 /*
3742 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3743 * __le32.
3744 */
3745 #define EXT_MAX_BLOCKS 0xffffffff
3746
3747 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3748 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3749 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3750 struct ext4_map_blocks *map, int flags);
3751 extern int ext4_ext_truncate(handle_t *, struct inode *);
3752 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3753 ext4_lblk_t end);
3754 extern void ext4_ext_init(struct super_block *);
3755 extern void ext4_ext_release(struct super_block *);
3756 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3757 loff_t len);
3758 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3759 loff_t offset, ssize_t len);
3760 extern int ext4_convert_unwritten_extents_atomic(handle_t *handle,
3761 struct inode *inode, loff_t offset, ssize_t len);
3762 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3763 ext4_io_end_t *io_end);
3764 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3765 struct ext4_map_blocks *map, int flags);
3766 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3767 int num,
3768 struct ext4_ext_path *path);
3769 extern struct ext4_ext_path *ext4_ext_insert_extent(
3770 handle_t *handle, struct inode *inode,
3771 struct ext4_ext_path *path,
3772 struct ext4_extent *newext, int gb_flags);
3773 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3774 struct ext4_ext_path *,
3775 int flags);
3776 extern void ext4_free_ext_path(struct ext4_ext_path *);
3777 extern int ext4_ext_check_inode(struct inode *inode);
3778 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3779 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3780 __u64 start, __u64 len);
3781 extern int ext4_get_es_cache(struct inode *inode,
3782 struct fiemap_extent_info *fieinfo,
3783 __u64 start, __u64 len);
3784 extern int ext4_ext_precache(struct inode *inode);
3785 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3786 struct inode *inode2, ext4_lblk_t lblk1,
3787 ext4_lblk_t lblk2, ext4_lblk_t count,
3788 int mark_unwritten,int *err);
3789 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3790 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3791 int check_cred, int restart_cred,
3792 int revoke_cred);
3793 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3794 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3795 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3796 int len, int unwritten, ext4_fsblk_t pblk);
3797 extern int ext4_ext_clear_bb(struct inode *inode);
3798
3799
3800 /* move_extent.c */
3801 extern void ext4_double_down_write_data_sem(struct inode *first,
3802 struct inode *second);
3803 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3804 struct inode *donor_inode);
3805 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3806 __u64 start_orig, __u64 start_donor,
3807 __u64 len, __u64 *moved_len);
3808
3809 /* page-io.c */
3810 extern int __init ext4_init_pageio(void);
3811 extern void ext4_exit_pageio(void);
3812 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3813 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3814 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3815 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3816 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3817 struct writeback_control *wbc);
3818 extern void ext4_end_io_rsv_work(struct work_struct *work);
3819 extern void ext4_io_submit(struct ext4_io_submit *io);
3820 int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
3821 size_t len);
3822 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3823 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3824
3825 /* mmp.c */
3826 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3827
3828 /* mmp.c */
3829 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3830
3831 /* verity.c */
3832 extern const struct fsverity_operations ext4_verityops;
3833
3834 /* orphan.c */
3835 extern int ext4_orphan_add(handle_t *, struct inode *);
3836 extern int ext4_orphan_del(handle_t *, struct inode *);
3837 extern void ext4_orphan_cleanup(struct super_block *sb,
3838 struct ext4_super_block *es);
3839 extern void ext4_release_orphan_info(struct super_block *sb);
3840 extern int ext4_init_orphan_info(struct super_block *sb);
3841 extern int ext4_orphan_file_empty(struct super_block *sb);
3842 extern void ext4_orphan_file_block_trigger(
3843 struct jbd2_buffer_trigger_type *triggers,
3844 struct buffer_head *bh,
3845 void *data, size_t size);
3846
3847 /*
3848 * Add new method to test whether block and inode bitmaps are properly
3849 * initialized. With uninit_bg reading the block from disk is not enough
3850 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3851 */
3852 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3853
bitmap_uptodate(struct buffer_head * bh)3854 static inline int bitmap_uptodate(struct buffer_head *bh)
3855 {
3856 return (buffer_uptodate(bh) &&
3857 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3858 }
set_bitmap_uptodate(struct buffer_head * bh)3859 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3860 {
3861 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3862 }
3863
3864 extern int ext4_resize_begin(struct super_block *sb);
3865 extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3866
ext4_set_io_unwritten_flag(struct ext4_io_end * io_end)3867 static inline void ext4_set_io_unwritten_flag(struct ext4_io_end *io_end)
3868 {
3869 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN))
3870 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3871 }
3872
ext4_clear_io_unwritten_flag(ext4_io_end_t * io_end)3873 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3874 {
3875 if (io_end->flag & EXT4_IO_END_UNWRITTEN)
3876 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3877 }
3878
3879 extern const struct iomap_ops ext4_iomap_ops;
3880 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3881 extern const struct iomap_ops ext4_iomap_report_ops;
3882
ext4_buffer_uptodate(struct buffer_head * bh)3883 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3884 {
3885 /*
3886 * If the buffer has the write error flag, we have failed
3887 * to write out data in the block. In this case, we don't
3888 * have to read the block because we may read the old data
3889 * successfully.
3890 */
3891 if (buffer_write_io_error(bh))
3892 set_buffer_uptodate(bh);
3893 return buffer_uptodate(bh);
3894 }
3895
ext4_inode_can_atomic_write(struct inode * inode)3896 static inline bool ext4_inode_can_atomic_write(struct inode *inode)
3897 {
3898
3899 return S_ISREG(inode->i_mode) &&
3900 ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
3901 EXT4_SB(inode->i_sb)->s_awu_min > 0;
3902 }
3903
3904 extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,
3905 loff_t pos, unsigned len,
3906 get_block_t *get_block);
3907 #endif /* __KERNEL__ */
3908
3909 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3910 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3911
3912 #endif /* _EXT4_H */
3913