1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ext4.h
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/include/linux/minix_fs.h
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 */
16
17 #ifndef _EXT4_H
18 #define _EXT4_H
19
20 #include <linux/refcount.h>
21 #include <linux/types.h>
22 #include <linux/blkdev.h>
23 #include <linux/magic.h>
24 #include <linux/jbd2.h>
25 #include <linux/quota.h>
26 #include <linux/rwsem.h>
27 #include <linux/rbtree.h>
28 #include <linux/seqlock.h>
29 #include <linux/mutex.h>
30 #include <linux/timer.h>
31 #include <linux/wait.h>
32 #include <linux/sched/signal.h>
33 #include <linux/blockgroup_lock.h>
34 #include <linux/percpu_counter.h>
35 #include <linux/ratelimit.h>
36 #include <crypto/hash.h>
37 #include <linux/falloc.h>
38 #include <linux/percpu-rwsem.h>
39 #include <linux/fiemap.h>
40 #ifdef __KERNEL__
41 #include <linux/compat.h>
42 #endif
43
44 #include <linux/fscrypt.h>
45 #include <linux/fsverity.h>
46
47 #include <linux/compiler.h>
48
49 /*
50 * The fourth extended filesystem constants/structures
51 */
52
53 /*
54 * with AGGRESSIVE_CHECK allocator runs consistency checks over
55 * structures. these checks slow things down a lot
56 */
57 #define AGGRESSIVE_CHECK__
58
59 /*
60 * with DOUBLE_CHECK defined mballoc creates persistent in-core
61 * bitmaps, maintains and uses them to check for double allocations
62 */
63 #define DOUBLE_CHECK__
64
65 /*
66 * Define EXT4FS_DEBUG to produce debug messages
67 */
68 #undef EXT4FS_DEBUG
69
70 /*
71 * Debug code
72 */
73 #ifdef EXT4FS_DEBUG
74 #define ext4_debug(f, a...) \
75 do { \
76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
77 __FILE__, __LINE__, __func__); \
78 printk(KERN_DEBUG f, ## a); \
79 } while (0)
80 #else
81 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
82 #endif
83
84 /*
85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
86 */
87 #define EXT_DEBUG__
88
89 /*
90 * Dynamic printk for controlled extents debugging.
91 */
92 #ifdef CONFIG_EXT4_DEBUG
93 #define ext_debug(ino, fmt, ...) \
94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
95 current->comm, task_pid_nr(current), \
96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
97 __func__, ##__VA_ARGS__)
98 #else
99 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
100 #endif
101
102 #define ASSERT(assert) \
103 do { \
104 if (unlikely(!(assert))) { \
105 printk(KERN_EMERG \
106 "Assertion failure in %s() at %s:%d: '%s'\n", \
107 __func__, __FILE__, __LINE__, #assert); \
108 BUG(); \
109 } \
110 } while (0)
111
112 /* data type for block offset of block group */
113 typedef int ext4_grpblk_t;
114
115 /* data type for filesystem-wide blocks number */
116 typedef unsigned long long ext4_fsblk_t;
117
118 /* data type for file logical block number */
119 typedef __u32 ext4_lblk_t;
120
121 /* data type for block group number */
122 typedef unsigned int ext4_group_t;
123
124 enum SHIFT_DIRECTION {
125 SHIFT_LEFT = 0,
126 SHIFT_RIGHT,
127 };
128
129 /*
130 * Flags used in mballoc's allocation_context flags field.
131 *
132 * Also used to show what's going on for debugging purposes when the
133 * flag field is exported via the traceport interface
134 */
135
136 /* prefer goal again. length */
137 #define EXT4_MB_HINT_MERGE 0x0001
138 /* blocks already reserved */
139 #define EXT4_MB_HINT_RESERVED 0x0002
140 /* metadata is being allocated */
141 #define EXT4_MB_HINT_METADATA 0x0004
142 /* first blocks in the file */
143 #define EXT4_MB_HINT_FIRST 0x0008
144 /* search for the best chunk */
145 #define EXT4_MB_HINT_BEST 0x0010
146 /* data is being allocated */
147 #define EXT4_MB_HINT_DATA 0x0020
148 /* don't preallocate (for tails) */
149 #define EXT4_MB_HINT_NOPREALLOC 0x0040
150 /* allocate for locality group */
151 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
152 /* allocate goal blocks or none */
153 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
154 /* goal is meaningful */
155 #define EXT4_MB_HINT_TRY_GOAL 0x0200
156 /* blocks already pre-reserved by delayed allocation */
157 #define EXT4_MB_DELALLOC_RESERVED 0x0400
158 /* We are doing stream allocation */
159 #define EXT4_MB_STREAM_ALLOC 0x0800
160 /* Use reserved root blocks if needed */
161 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
162 /* Use blocks from reserved pool */
163 #define EXT4_MB_USE_RESERVED 0x2000
164 /* Do strict check for free blocks while retrying block allocation */
165 #define EXT4_MB_STRICT_CHECK 0x4000
166 /* Large fragment size list lookup succeeded at least once for cr = 0 */
167 #define EXT4_MB_CR0_OPTIMIZED 0x8000
168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
169 #define EXT4_MB_CR1_OPTIMIZED 0x00010000
170 /* Perform linear traversal for one group */
171 #define EXT4_MB_SEARCH_NEXT_LINEAR 0x00020000
172 struct ext4_allocation_request {
173 /* target inode for block we're allocating */
174 struct inode *inode;
175 /* how many blocks we want to allocate */
176 unsigned int len;
177 /* logical block in target inode */
178 ext4_lblk_t logical;
179 /* the closest logical allocated block to the left */
180 ext4_lblk_t lleft;
181 /* the closest logical allocated block to the right */
182 ext4_lblk_t lright;
183 /* phys. target (a hint) */
184 ext4_fsblk_t goal;
185 /* phys. block for the closest logical allocated block to the left */
186 ext4_fsblk_t pleft;
187 /* phys. block for the closest logical allocated block to the right */
188 ext4_fsblk_t pright;
189 /* flags. see above EXT4_MB_HINT_* */
190 unsigned int flags;
191 };
192
193 /*
194 * Logical to physical block mapping, used by ext4_map_blocks()
195 *
196 * This structure is used to pass requests into ext4_map_blocks() as
197 * well as to store the information returned by ext4_map_blocks(). It
198 * takes less room on the stack than a struct buffer_head.
199 */
200 #define EXT4_MAP_NEW BIT(BH_New)
201 #define EXT4_MAP_MAPPED BIT(BH_Mapped)
202 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
203 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
204 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
205 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
206
207 struct ext4_map_blocks {
208 ext4_fsblk_t m_pblk;
209 ext4_lblk_t m_lblk;
210 unsigned int m_len;
211 unsigned int m_flags;
212 };
213
214 /*
215 * Block validity checking, system zone rbtree.
216 */
217 struct ext4_system_blocks {
218 struct rb_root root;
219 struct rcu_head rcu;
220 };
221
222 /*
223 * Flags for ext4_io_end->flags
224 */
225 #define EXT4_IO_END_UNWRITTEN 0x0001
226
227 struct ext4_io_end_vec {
228 struct list_head list; /* list of io_end_vec */
229 loff_t offset; /* offset in the file */
230 ssize_t size; /* size of the extent */
231 };
232
233 /*
234 * For converting unwritten extents on a work queue. 'handle' is used for
235 * buffered writeback.
236 */
237 typedef struct ext4_io_end {
238 struct list_head list; /* per-file finished IO list */
239 handle_t *handle; /* handle reserved for extent
240 * conversion */
241 struct inode *inode; /* file being written to */
242 struct bio *bio; /* Linked list of completed
243 * bios covering the extent */
244 unsigned int flag; /* unwritten or not */
245 refcount_t count; /* reference counter */
246 struct list_head list_vec; /* list of ext4_io_end_vec */
247 } ext4_io_end_t;
248
249 struct ext4_io_submit {
250 struct writeback_control *io_wbc;
251 struct bio *io_bio;
252 ext4_io_end_t *io_end;
253 sector_t io_next_block;
254 };
255
256 /*
257 * Special inodes numbers
258 */
259 #define EXT4_BAD_INO 1 /* Bad blocks inode */
260 #define EXT4_ROOT_INO 2 /* Root inode */
261 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
262 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
263 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
264 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
265 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
266 #define EXT4_JOURNAL_INO 8 /* Journal inode */
267
268 /* First non-reserved inode for old ext4 filesystems */
269 #define EXT4_GOOD_OLD_FIRST_INO 11
270
271 /*
272 * Maximal count of links to a file
273 */
274 #define EXT4_LINK_MAX 65000
275
276 /*
277 * Macro-instructions used to manage several block sizes
278 */
279 #define EXT4_MIN_BLOCK_SIZE 1024
280 #define EXT4_MAX_BLOCK_SIZE 65536
281 #define EXT4_MIN_BLOCK_LOG_SIZE 10
282 #define EXT4_MAX_BLOCK_LOG_SIZE 16
283 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
284 #ifdef __KERNEL__
285 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
286 #else
287 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
288 #endif
289 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
290 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
291 EXT4_SB(s)->s_cluster_bits)
292 #ifdef __KERNEL__
293 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
294 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
295 #else
296 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
297 #endif
298 #ifdef __KERNEL__
299 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
300 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
301 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
302 #else
303 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
304 EXT4_GOOD_OLD_INODE_SIZE : \
305 (s)->s_inode_size)
306 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
307 EXT4_GOOD_OLD_FIRST_INO : \
308 (s)->s_first_ino)
309 #endif
310 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
311 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
312 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
313 blkbits))
314
315 /* Translate a block number to a cluster number */
316 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
317 /* Translate a cluster number to a block number */
318 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
319 /* Translate # of blks to # of clusters */
320 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
321 (sbi)->s_cluster_bits)
322 /* Mask out the low bits to get the starting block of the cluster */
323 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
324 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
325 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
326 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
327 /* Fill in the low bits to get the last block of the cluster */
328 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
329 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
330 /* Get the cluster offset */
331 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
332 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
333 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
334 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
335
336 /*
337 * Structure of a blocks group descriptor
338 */
339 struct ext4_group_desc
340 {
341 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
342 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
343 __le32 bg_inode_table_lo; /* Inodes table block */
344 __le16 bg_free_blocks_count_lo;/* Free blocks count */
345 __le16 bg_free_inodes_count_lo;/* Free inodes count */
346 __le16 bg_used_dirs_count_lo; /* Directories count */
347 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
348 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
349 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
350 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
351 __le16 bg_itable_unused_lo; /* Unused inodes count */
352 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
353 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
354 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
355 __le32 bg_inode_table_hi; /* Inodes table block MSB */
356 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
357 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
358 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
359 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
360 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
361 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
362 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
363 __u32 bg_reserved;
364 };
365
366 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
367 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
368 sizeof(__le16))
369 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
370 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
371 sizeof(__le16))
372
373 /*
374 * Structure of a flex block group info
375 */
376
377 struct flex_groups {
378 atomic64_t free_clusters;
379 atomic_t free_inodes;
380 atomic_t used_dirs;
381 };
382
383 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
384 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
385 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
386
387 /*
388 * Macro-instructions used to manage group descriptors
389 */
390 #define EXT4_MIN_DESC_SIZE 32
391 #define EXT4_MIN_DESC_SIZE_64BIT 64
392 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
393 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
394 #ifdef __KERNEL__
395 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
396 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
397 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
398 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
399 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
400 #else
401 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
402 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
403 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
404 #endif
405
406 /*
407 * Constants relative to the data blocks
408 */
409 #define EXT4_NDIR_BLOCKS 12
410 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
411 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
412 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
413 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
414
415 /*
416 * Inode flags
417 */
418 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
419 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
420 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
421 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
422 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
423 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
424 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
425 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
426 /* Reserved for compression usage... */
427 #define EXT4_DIRTY_FL 0x00000100
428 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
429 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
430 /* nb: was previously EXT2_ECOMPR_FL */
431 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
432 /* End compression flags --- maybe not all used */
433 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
434 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
435 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
436 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
437 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
438 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
439 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
440 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
441 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
442 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
443 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
444
445 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
446
447 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
448 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
449 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
450 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
451
452 /* User modifiable flags */
453 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
454 EXT4_UNRM_FL | \
455 EXT4_COMPR_FL | \
456 EXT4_SYNC_FL | \
457 EXT4_IMMUTABLE_FL | \
458 EXT4_APPEND_FL | \
459 EXT4_NODUMP_FL | \
460 EXT4_NOATIME_FL | \
461 EXT4_JOURNAL_DATA_FL | \
462 EXT4_NOTAIL_FL | \
463 EXT4_DIRSYNC_FL | \
464 EXT4_TOPDIR_FL | \
465 EXT4_EXTENTS_FL | \
466 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
467 EXT4_DAX_FL | \
468 EXT4_PROJINHERIT_FL | \
469 EXT4_CASEFOLD_FL)
470
471 /* User visible flags */
472 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
473 EXT4_DIRTY_FL | \
474 EXT4_COMPRBLK_FL | \
475 EXT4_NOCOMPR_FL | \
476 EXT4_ENCRYPT_FL | \
477 EXT4_INDEX_FL | \
478 EXT4_VERITY_FL | \
479 EXT4_INLINE_DATA_FL)
480
481 /* Flags that should be inherited by new inodes from their parent. */
482 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
483 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
484 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
485 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
486 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
487 EXT4_DAX_FL)
488
489 /* Flags that are appropriate for regular files (all but dir-specific ones). */
490 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
491 EXT4_PROJINHERIT_FL))
492
493 /* Flags that are appropriate for non-directories/regular files. */
494 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
495
496 /* The only flags that should be swapped */
497 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
498
499 /* Flags which are mutually exclusive to DAX */
500 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
501 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
502
503 /* Mask out flags that are inappropriate for the given type of inode. */
ext4_mask_flags(umode_t mode,__u32 flags)504 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
505 {
506 if (S_ISDIR(mode))
507 return flags;
508 else if (S_ISREG(mode))
509 return flags & EXT4_REG_FLMASK;
510 else
511 return flags & EXT4_OTHER_FLMASK;
512 }
513
514 /*
515 * Inode flags used for atomic set/get
516 */
517 enum {
518 EXT4_INODE_SECRM = 0, /* Secure deletion */
519 EXT4_INODE_UNRM = 1, /* Undelete */
520 EXT4_INODE_COMPR = 2, /* Compress file */
521 EXT4_INODE_SYNC = 3, /* Synchronous updates */
522 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
523 EXT4_INODE_APPEND = 5, /* writes to file may only append */
524 EXT4_INODE_NODUMP = 6, /* do not dump file */
525 EXT4_INODE_NOATIME = 7, /* do not update atime */
526 /* Reserved for compression usage... */
527 EXT4_INODE_DIRTY = 8,
528 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
529 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
530 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
531 /* End compression flags --- maybe not all used */
532 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
533 EXT4_INODE_IMAGIC = 13, /* AFS directory */
534 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
535 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
536 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
537 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
538 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
539 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
540 EXT4_INODE_VERITY = 20, /* Verity protected inode */
541 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
542 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
543 EXT4_INODE_DAX = 25, /* Inode is DAX */
544 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
545 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
546 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
547 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
548 };
549
550 /*
551 * Since it's pretty easy to mix up bit numbers and hex values, we use a
552 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
553 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
554 * any extra space in the compiled kernel image, otherwise, the build will fail.
555 * It's important that these values are the same, since we are using
556 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
557 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
558 * values found in ext2, ext3 and ext4 filesystems, and of course the values
559 * defined in e2fsprogs.
560 *
561 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
562 */
563 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
564 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
565
ext4_check_flag_values(void)566 static inline void ext4_check_flag_values(void)
567 {
568 CHECK_FLAG_VALUE(SECRM);
569 CHECK_FLAG_VALUE(UNRM);
570 CHECK_FLAG_VALUE(COMPR);
571 CHECK_FLAG_VALUE(SYNC);
572 CHECK_FLAG_VALUE(IMMUTABLE);
573 CHECK_FLAG_VALUE(APPEND);
574 CHECK_FLAG_VALUE(NODUMP);
575 CHECK_FLAG_VALUE(NOATIME);
576 CHECK_FLAG_VALUE(DIRTY);
577 CHECK_FLAG_VALUE(COMPRBLK);
578 CHECK_FLAG_VALUE(NOCOMPR);
579 CHECK_FLAG_VALUE(ENCRYPT);
580 CHECK_FLAG_VALUE(INDEX);
581 CHECK_FLAG_VALUE(IMAGIC);
582 CHECK_FLAG_VALUE(JOURNAL_DATA);
583 CHECK_FLAG_VALUE(NOTAIL);
584 CHECK_FLAG_VALUE(DIRSYNC);
585 CHECK_FLAG_VALUE(TOPDIR);
586 CHECK_FLAG_VALUE(HUGE_FILE);
587 CHECK_FLAG_VALUE(EXTENTS);
588 CHECK_FLAG_VALUE(VERITY);
589 CHECK_FLAG_VALUE(EA_INODE);
590 CHECK_FLAG_VALUE(INLINE_DATA);
591 CHECK_FLAG_VALUE(PROJINHERIT);
592 CHECK_FLAG_VALUE(CASEFOLD);
593 CHECK_FLAG_VALUE(RESERVED);
594 }
595
596 /* Used to pass group descriptor data when online resize is done */
597 struct ext4_new_group_input {
598 __u32 group; /* Group number for this data */
599 __u64 block_bitmap; /* Absolute block number of block bitmap */
600 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
601 __u64 inode_table; /* Absolute block number of inode table start */
602 __u32 blocks_count; /* Total number of blocks in this group */
603 __u16 reserved_blocks; /* Number of reserved blocks in this group */
604 __u16 unused;
605 };
606
607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
608 struct compat_ext4_new_group_input {
609 u32 group;
610 compat_u64 block_bitmap;
611 compat_u64 inode_bitmap;
612 compat_u64 inode_table;
613 u32 blocks_count;
614 u16 reserved_blocks;
615 u16 unused;
616 };
617 #endif
618
619 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
620 struct ext4_new_group_data {
621 __u32 group;
622 __u64 block_bitmap;
623 __u64 inode_bitmap;
624 __u64 inode_table;
625 __u32 blocks_count;
626 __u16 reserved_blocks;
627 __u16 mdata_blocks;
628 __u32 free_clusters_count;
629 };
630
631 /* Indexes used to index group tables in ext4_new_group_data */
632 enum {
633 BLOCK_BITMAP = 0, /* block bitmap */
634 INODE_BITMAP, /* inode bitmap */
635 INODE_TABLE, /* inode tables */
636 GROUP_TABLE_COUNT,
637 };
638
639 /*
640 * Flags used by ext4_map_blocks()
641 */
642 /* Allocate any needed blocks and/or convert an unwritten
643 extent to be an initialized ext4 */
644 #define EXT4_GET_BLOCKS_CREATE 0x0001
645 /* Request the creation of an unwritten extent */
646 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
647 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
648 EXT4_GET_BLOCKS_CREATE)
649 /* Caller is from the delayed allocation writeout path
650 * finally doing the actual allocation of delayed blocks */
651 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
652 /* caller is from the direct IO path, request to creation of an
653 unwritten extents if not allocated, split the unwritten
654 extent if blocks has been preallocated already*/
655 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
656 #define EXT4_GET_BLOCKS_CONVERT 0x0010
657 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
658 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
659 /* Convert extent to initialized after IO complete */
660 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
661 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
662 /* Eventual metadata allocation (due to growing extent tree)
663 * should not fail, so try to use reserved blocks for that.*/
664 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
665 /* Don't normalize allocation size (used for fallocate) */
666 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
667 /* Convert written extents to unwritten */
668 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
669 /* Write zeros to newly created written extents */
670 #define EXT4_GET_BLOCKS_ZERO 0x0200
671 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
672 EXT4_GET_BLOCKS_ZERO)
673 /* Caller will submit data before dropping transaction handle. This
674 * allows jbd2 to avoid submitting data before commit. */
675 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
676 /* Caller is in the atomic contex, find extent if it has been cached */
677 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
678
679 /*
680 * The bit position of these flags must not overlap with any of the
681 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
682 * read_extent_tree_block(), ext4_split_extent_at(),
683 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
684 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
685 * caching the extents when reading from the extent tree while a
686 * truncate or punch hole operation is in progress.
687 */
688 #define EXT4_EX_NOCACHE 0x40000000
689 #define EXT4_EX_FORCE_CACHE 0x20000000
690 #define EXT4_EX_NOFAIL 0x10000000
691
692 /*
693 * Flags used by ext4_free_blocks
694 */
695 #define EXT4_FREE_BLOCKS_METADATA 0x0001
696 #define EXT4_FREE_BLOCKS_FORGET 0x0002
697 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
698 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
699 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
700 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
701 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
702
703 /*
704 * ioctl commands
705 */
706 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
707 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
708 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
709 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
710 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
711 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
712 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
713 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
714 #define EXT4_IOC_MIGRATE _IO('f', 9)
715 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
716 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
717 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
718 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
719 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
720 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
721 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
722 /* ioctl codes 19--39 are reserved for fscrypt */
723 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
724 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
725 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
726 #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32)
727
728 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
729
730 /*
731 * Flags for going down operation
732 */
733 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
734 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
735 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
736
737 /*
738 * Flags returned by EXT4_IOC_GETSTATE
739 *
740 * We only expose to userspace a subset of the state flags in
741 * i_state_flags
742 */
743 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
744 #define EXT4_STATE_FLAG_NEW 0x00000002
745 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004
746 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
747
748 /* flags for ioctl EXT4_IOC_CHECKPOINT */
749 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1
750 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2
751 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4
752 #define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
753 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
754 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
755
756 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
757 /*
758 * ioctl commands in 32 bit emulation
759 */
760 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
761 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
762 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
763 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
764 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
765 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
766 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
767 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
768 #endif
769
770 /*
771 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
772 * It indicates that the entry in extent status cache is for a hole.
773 */
774 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
775
776 /* Max physical block we can address w/o extents */
777 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
778
779 /* Max logical block we can support */
780 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
781
782 /*
783 * Structure of an inode on the disk
784 */
785 struct ext4_inode {
786 __le16 i_mode; /* File mode */
787 __le16 i_uid; /* Low 16 bits of Owner Uid */
788 __le32 i_size_lo; /* Size in bytes */
789 __le32 i_atime; /* Access time */
790 __le32 i_ctime; /* Inode Change time */
791 __le32 i_mtime; /* Modification time */
792 __le32 i_dtime; /* Deletion Time */
793 __le16 i_gid; /* Low 16 bits of Group Id */
794 __le16 i_links_count; /* Links count */
795 __le32 i_blocks_lo; /* Blocks count */
796 __le32 i_flags; /* File flags */
797 union {
798 struct {
799 __le32 l_i_version;
800 } linux1;
801 struct {
802 __u32 h_i_translator;
803 } hurd1;
804 struct {
805 __u32 m_i_reserved1;
806 } masix1;
807 } osd1; /* OS dependent 1 */
808 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
809 __le32 i_generation; /* File version (for NFS) */
810 __le32 i_file_acl_lo; /* File ACL */
811 __le32 i_size_high;
812 __le32 i_obso_faddr; /* Obsoleted fragment address */
813 union {
814 struct {
815 __le16 l_i_blocks_high; /* were l_i_reserved1 */
816 __le16 l_i_file_acl_high;
817 __le16 l_i_uid_high; /* these 2 fields */
818 __le16 l_i_gid_high; /* were reserved2[0] */
819 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
820 __le16 l_i_reserved;
821 } linux2;
822 struct {
823 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
824 __u16 h_i_mode_high;
825 __u16 h_i_uid_high;
826 __u16 h_i_gid_high;
827 __u32 h_i_author;
828 } hurd2;
829 struct {
830 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
831 __le16 m_i_file_acl_high;
832 __u32 m_i_reserved2[2];
833 } masix2;
834 } osd2; /* OS dependent 2 */
835 __le16 i_extra_isize;
836 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
837 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
838 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
839 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
840 __le32 i_crtime; /* File Creation time */
841 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
842 __le32 i_version_hi; /* high 32 bits for 64-bit version */
843 __le32 i_projid; /* Project ID */
844 };
845
846 struct move_extent {
847 __u32 reserved; /* should be zero */
848 __u32 donor_fd; /* donor file descriptor */
849 __u64 orig_start; /* logical start offset in block for orig */
850 __u64 donor_start; /* logical start offset in block for donor */
851 __u64 len; /* block length to be moved */
852 __u64 moved_len; /* moved block length */
853 };
854
855 #define EXT4_EPOCH_BITS 2
856 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
857 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
858
859 /*
860 * Extended fields will fit into an inode if the filesystem was formatted
861 * with large inodes (-I 256 or larger) and there are not currently any EAs
862 * consuming all of the available space. For new inodes we always reserve
863 * enough space for the kernel's known extended fields, but for inodes
864 * created with an old kernel this might not have been the case. None of
865 * the extended inode fields is critical for correct filesystem operation.
866 * This macro checks if a certain field fits in the inode. Note that
867 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
868 */
869 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
870 ((offsetof(typeof(*ext4_inode), field) + \
871 sizeof((ext4_inode)->field)) \
872 <= (EXT4_GOOD_OLD_INODE_SIZE + \
873 (einode)->i_extra_isize)) \
874
875 /*
876 * We use an encoding that preserves the times for extra epoch "00":
877 *
878 * extra msb of adjust for signed
879 * epoch 32-bit 32-bit tv_sec to
880 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
881 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
882 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
883 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
884 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
885 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
886 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
887 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
888 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
889 *
890 * Note that previous versions of the kernel on 64-bit systems would
891 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
892 * 1970. e2fsck will correct this, assuming that it is run on the
893 * affected filesystem before 2242.
894 */
895
ext4_encode_extra_time(struct timespec64 * time)896 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
897 {
898 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
899 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
900 }
901
ext4_decode_extra_time(struct timespec64 * time,__le32 extra)902 static inline void ext4_decode_extra_time(struct timespec64 *time,
903 __le32 extra)
904 {
905 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
906 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
907 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
908 }
909
910 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
911 do { \
912 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
913 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
914 (raw_inode)->xtime ## _extra = \
915 ext4_encode_extra_time(&(inode)->xtime); \
916 } \
917 else \
918 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
919 } while (0)
920
921 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
922 do { \
923 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
924 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
925 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
926 (raw_inode)->xtime ## _extra = \
927 ext4_encode_extra_time(&(einode)->xtime); \
928 } while (0)
929
930 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
931 do { \
932 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
933 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
934 ext4_decode_extra_time(&(inode)->xtime, \
935 raw_inode->xtime ## _extra); \
936 } \
937 else \
938 (inode)->xtime.tv_nsec = 0; \
939 } while (0)
940
941
942 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
943 do { \
944 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
945 (einode)->xtime.tv_sec = \
946 (signed)le32_to_cpu((raw_inode)->xtime); \
947 else \
948 (einode)->xtime.tv_sec = 0; \
949 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
950 ext4_decode_extra_time(&(einode)->xtime, \
951 raw_inode->xtime ## _extra); \
952 else \
953 (einode)->xtime.tv_nsec = 0; \
954 } while (0)
955
956 #define i_disk_version osd1.linux1.l_i_version
957
958 #if defined(__KERNEL__) || defined(__linux__)
959 #define i_reserved1 osd1.linux1.l_i_reserved1
960 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
961 #define i_blocks_high osd2.linux2.l_i_blocks_high
962 #define i_uid_low i_uid
963 #define i_gid_low i_gid
964 #define i_uid_high osd2.linux2.l_i_uid_high
965 #define i_gid_high osd2.linux2.l_i_gid_high
966 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
967
968 #elif defined(__GNU__)
969
970 #define i_translator osd1.hurd1.h_i_translator
971 #define i_uid_high osd2.hurd2.h_i_uid_high
972 #define i_gid_high osd2.hurd2.h_i_gid_high
973 #define i_author osd2.hurd2.h_i_author
974
975 #elif defined(__masix__)
976
977 #define i_reserved1 osd1.masix1.m_i_reserved1
978 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
979 #define i_reserved2 osd2.masix2.m_i_reserved2
980
981 #endif /* defined(__KERNEL__) || defined(__linux__) */
982
983 #include "extents_status.h"
984 #include "fast_commit.h"
985
986 /*
987 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
988 *
989 * These are needed to avoid lockdep false positives when we need to
990 * allocate blocks to the quota inode during ext4_map_blocks(), while
991 * holding i_data_sem for a normal (non-quota) inode. Since we don't
992 * do quota tracking for the quota inode, this avoids deadlock (as
993 * well as infinite recursion, since it isn't turtles all the way
994 * down...)
995 *
996 * I_DATA_SEM_NORMAL - Used for most inodes
997 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
998 * where the second inode has larger inode number
999 * than the first
1000 * I_DATA_SEM_QUOTA - Used for quota inodes only
1001 */
1002 enum {
1003 I_DATA_SEM_NORMAL = 0,
1004 I_DATA_SEM_OTHER,
1005 I_DATA_SEM_QUOTA,
1006 };
1007
1008
1009 /*
1010 * fourth extended file system inode data in memory
1011 */
1012 struct ext4_inode_info {
1013 __le32 i_data[15]; /* unconverted */
1014 __u32 i_dtime;
1015 ext4_fsblk_t i_file_acl;
1016
1017 /*
1018 * i_block_group is the number of the block group which contains
1019 * this file's inode. Constant across the lifetime of the inode,
1020 * it is used for making block allocation decisions - we try to
1021 * place a file's data blocks near its inode block, and new inodes
1022 * near to their parent directory's inode.
1023 */
1024 ext4_group_t i_block_group;
1025 ext4_lblk_t i_dir_start_lookup;
1026 #if (BITS_PER_LONG < 64)
1027 unsigned long i_state_flags; /* Dynamic state flags */
1028 #endif
1029 unsigned long i_flags;
1030
1031 /*
1032 * Extended attributes can be read independently of the main file
1033 * data. Taking i_rwsem even when reading would cause contention
1034 * between readers of EAs and writers of regular file data, so
1035 * instead we synchronize on xattr_sem when reading or changing
1036 * EAs.
1037 */
1038 struct rw_semaphore xattr_sem;
1039
1040 /*
1041 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1042 * i_orphan is used.
1043 */
1044 union {
1045 struct list_head i_orphan; /* unlinked but open inodes */
1046 unsigned int i_orphan_idx; /* Index in orphan file */
1047 };
1048
1049 /* Fast commit related info */
1050
1051 /* For tracking dentry create updates */
1052 struct list_head i_fc_dilist;
1053 struct list_head i_fc_list; /*
1054 * inodes that need fast commit
1055 * protected by sbi->s_fc_lock.
1056 */
1057
1058 /* Start of lblk range that needs to be committed in this fast commit */
1059 ext4_lblk_t i_fc_lblk_start;
1060
1061 /* End of lblk range that needs to be committed in this fast commit */
1062 ext4_lblk_t i_fc_lblk_len;
1063
1064 /* Number of ongoing updates on this inode */
1065 atomic_t i_fc_updates;
1066
1067 /* Fast commit wait queue for this inode */
1068 wait_queue_head_t i_fc_wait;
1069
1070 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1071 struct mutex i_fc_lock;
1072
1073 /*
1074 * i_disksize keeps track of what the inode size is ON DISK, not
1075 * in memory. During truncate, i_size is set to the new size by
1076 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1077 * set i_disksize to 0 until the truncate is actually under way.
1078 *
1079 * The intent is that i_disksize always represents the blocks which
1080 * are used by this file. This allows recovery to restart truncate
1081 * on orphans if we crash during truncate. We actually write i_disksize
1082 * into the on-disk inode when writing inodes out, instead of i_size.
1083 *
1084 * The only time when i_disksize and i_size may be different is when
1085 * a truncate is in progress. The only things which change i_disksize
1086 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1087 */
1088 loff_t i_disksize;
1089
1090 /*
1091 * i_data_sem is for serialising ext4_truncate() against
1092 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1093 * data tree are chopped off during truncate. We can't do that in
1094 * ext4 because whenever we perform intermediate commits during
1095 * truncate, the inode and all the metadata blocks *must* be in a
1096 * consistent state which allows truncation of the orphans to restart
1097 * during recovery. Hence we must fix the get_block-vs-truncate race
1098 * by other means, so we have i_data_sem.
1099 */
1100 struct rw_semaphore i_data_sem;
1101 struct inode vfs_inode;
1102 struct jbd2_inode *jinode;
1103
1104 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1105
1106 /*
1107 * File creation time. Its function is same as that of
1108 * struct timespec64 i_{a,c,m}time in the generic inode.
1109 */
1110 struct timespec64 i_crtime;
1111
1112 /* mballoc */
1113 atomic_t i_prealloc_active;
1114 struct list_head i_prealloc_list;
1115 spinlock_t i_prealloc_lock;
1116
1117 /* extents status tree */
1118 struct ext4_es_tree i_es_tree;
1119 rwlock_t i_es_lock;
1120 struct list_head i_es_list;
1121 unsigned int i_es_all_nr; /* protected by i_es_lock */
1122 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1123 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1124 extents to shrink. Protected by
1125 i_es_lock */
1126
1127 /* ialloc */
1128 ext4_group_t i_last_alloc_group;
1129
1130 /* allocation reservation info for delalloc */
1131 /* In case of bigalloc, this refer to clusters rather than blocks */
1132 unsigned int i_reserved_data_blocks;
1133
1134 /* pending cluster reservations for bigalloc file systems */
1135 struct ext4_pending_tree i_pending_tree;
1136
1137 /* on-disk additional length */
1138 __u16 i_extra_isize;
1139
1140 /* Indicate the inline data space. */
1141 u16 i_inline_off;
1142 u16 i_inline_size;
1143
1144 #ifdef CONFIG_QUOTA
1145 /* quota space reservation, managed internally by quota code */
1146 qsize_t i_reserved_quota;
1147 #endif
1148
1149 /* Lock protecting lists below */
1150 spinlock_t i_completed_io_lock;
1151 /*
1152 * Completed IOs that need unwritten extents handling and have
1153 * transaction reserved
1154 */
1155 struct list_head i_rsv_conversion_list;
1156 struct work_struct i_rsv_conversion_work;
1157 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1158
1159 spinlock_t i_block_reservation_lock;
1160
1161 /*
1162 * Transactions that contain inode's metadata needed to complete
1163 * fsync and fdatasync, respectively.
1164 */
1165 tid_t i_sync_tid;
1166 tid_t i_datasync_tid;
1167
1168 #ifdef CONFIG_QUOTA
1169 struct dquot *i_dquot[MAXQUOTAS];
1170 #endif
1171
1172 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1173 __u32 i_csum_seed;
1174
1175 kprojid_t i_projid;
1176 };
1177
1178 /*
1179 * File system states
1180 */
1181 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1182 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1183 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1184 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1185
1186 /*
1187 * Misc. filesystem flags
1188 */
1189 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1190 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1191 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1192
1193 /*
1194 * Mount flags set via mount options or defaults
1195 */
1196 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1197 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1198 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1199 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1200 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1201 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1202 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1203 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1204 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1205 #ifdef CONFIG_FS_DAX
1206 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1207 #else
1208 #define EXT4_MOUNT_DAX_ALWAYS 0
1209 #endif
1210 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1211 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1212 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1213 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1214 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1215 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1216 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1217 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1218 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1219 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1220 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1221 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1222 * enable enforcement for hidden
1223 * quota files */
1224 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1225 * enforcement for hidden quota
1226 * files */
1227 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1228 * enforcement */
1229 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1230 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1231 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1232 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1233 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1234 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1235 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1236 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1237 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1238 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1239
1240 /*
1241 * Mount flags set either automatically (could not be set by mount option)
1242 * based on per file system feature or property or in special cases such as
1243 * distinguishing between explicit mount option definition and default.
1244 */
1245 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1246 specified delalloc */
1247 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1248 size of blocksize * 8
1249 blocks */
1250 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1251 file systems */
1252 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1253 specified journal checksum */
1254
1255 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1256 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1257 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1258 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1259 * scanning in mballoc
1260 */
1261
1262 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1263 ~EXT4_MOUNT_##opt
1264 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1265 EXT4_MOUNT_##opt
1266 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1267 EXT4_MOUNT_##opt)
1268
1269 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1270 ~EXT4_MOUNT2_##opt
1271 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1272 EXT4_MOUNT2_##opt
1273 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1274 EXT4_MOUNT2_##opt)
1275
1276 #define ext4_test_and_set_bit __test_and_set_bit_le
1277 #define ext4_set_bit __set_bit_le
1278 #define ext4_set_bit_atomic ext2_set_bit_atomic
1279 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1280 #define ext4_clear_bit __clear_bit_le
1281 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1282 #define ext4_test_bit test_bit_le
1283 #define ext4_find_next_zero_bit find_next_zero_bit_le
1284 #define ext4_find_next_bit find_next_bit_le
1285
1286 extern void mb_set_bits(void *bm, int cur, int len);
1287
1288 /*
1289 * Maximal mount counts between two filesystem checks
1290 */
1291 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1292 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1293
1294 /*
1295 * Behaviour when detecting errors
1296 */
1297 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1298 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1299 #define EXT4_ERRORS_PANIC 3 /* Panic */
1300 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1301
1302 /* Metadata checksum algorithm codes */
1303 #define EXT4_CRC32C_CHKSUM 1
1304
1305 #define EXT4_LABEL_MAX 16
1306
1307 /*
1308 * Structure of the super block
1309 */
1310 struct ext4_super_block {
1311 /*00*/ __le32 s_inodes_count; /* Inodes count */
1312 __le32 s_blocks_count_lo; /* Blocks count */
1313 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1314 __le32 s_free_blocks_count_lo; /* Free blocks count */
1315 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1316 __le32 s_first_data_block; /* First Data Block */
1317 __le32 s_log_block_size; /* Block size */
1318 __le32 s_log_cluster_size; /* Allocation cluster size */
1319 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1320 __le32 s_clusters_per_group; /* # Clusters per group */
1321 __le32 s_inodes_per_group; /* # Inodes per group */
1322 __le32 s_mtime; /* Mount time */
1323 /*30*/ __le32 s_wtime; /* Write time */
1324 __le16 s_mnt_count; /* Mount count */
1325 __le16 s_max_mnt_count; /* Maximal mount count */
1326 __le16 s_magic; /* Magic signature */
1327 __le16 s_state; /* File system state */
1328 __le16 s_errors; /* Behaviour when detecting errors */
1329 __le16 s_minor_rev_level; /* minor revision level */
1330 /*40*/ __le32 s_lastcheck; /* time of last check */
1331 __le32 s_checkinterval; /* max. time between checks */
1332 __le32 s_creator_os; /* OS */
1333 __le32 s_rev_level; /* Revision level */
1334 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1335 __le16 s_def_resgid; /* Default gid for reserved blocks */
1336 /*
1337 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1338 *
1339 * Note: the difference between the compatible feature set and
1340 * the incompatible feature set is that if there is a bit set
1341 * in the incompatible feature set that the kernel doesn't
1342 * know about, it should refuse to mount the filesystem.
1343 *
1344 * e2fsck's requirements are more strict; if it doesn't know
1345 * about a feature in either the compatible or incompatible
1346 * feature set, it must abort and not try to meddle with
1347 * things it doesn't understand...
1348 */
1349 __le32 s_first_ino; /* First non-reserved inode */
1350 __le16 s_inode_size; /* size of inode structure */
1351 __le16 s_block_group_nr; /* block group # of this superblock */
1352 __le32 s_feature_compat; /* compatible feature set */
1353 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1354 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1355 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1356 /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */
1357 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1358 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1359 /*
1360 * Performance hints. Directory preallocation should only
1361 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1362 */
1363 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1364 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1365 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1366 /*
1367 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1368 */
1369 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1370 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1371 __le32 s_journal_dev; /* device number of journal file */
1372 __le32 s_last_orphan; /* start of list of inodes to delete */
1373 __le32 s_hash_seed[4]; /* HTREE hash seed */
1374 __u8 s_def_hash_version; /* Default hash version to use */
1375 __u8 s_jnl_backup_type;
1376 __le16 s_desc_size; /* size of group descriptor */
1377 /*100*/ __le32 s_default_mount_opts;
1378 __le32 s_first_meta_bg; /* First metablock block group */
1379 __le32 s_mkfs_time; /* When the filesystem was created */
1380 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1381 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1382 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1383 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1384 __le32 s_free_blocks_count_hi; /* Free blocks count */
1385 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1386 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1387 __le32 s_flags; /* Miscellaneous flags */
1388 __le16 s_raid_stride; /* RAID stride */
1389 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1390 __le64 s_mmp_block; /* Block for multi-mount protection */
1391 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1392 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1393 __u8 s_checksum_type; /* metadata checksum algorithm used */
1394 __u8 s_encryption_level; /* versioning level for encryption */
1395 __u8 s_reserved_pad; /* Padding to next 32bits */
1396 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1397 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1398 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1399 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1400 snapshot's future use */
1401 __le32 s_snapshot_list; /* inode number of the head of the
1402 on-disk snapshot list */
1403 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1404 __le32 s_error_count; /* number of fs errors */
1405 __le32 s_first_error_time; /* first time an error happened */
1406 __le32 s_first_error_ino; /* inode involved in first error */
1407 __le64 s_first_error_block; /* block involved of first error */
1408 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1409 __le32 s_first_error_line; /* line number where error happened */
1410 __le32 s_last_error_time; /* most recent time of an error */
1411 __le32 s_last_error_ino; /* inode involved in last error */
1412 __le32 s_last_error_line; /* line number where error happened */
1413 __le64 s_last_error_block; /* block involved of last error */
1414 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1415 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1416 __u8 s_mount_opts[64];
1417 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1418 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1419 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1420 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1421 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1422 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1423 __le32 s_lpf_ino; /* Location of the lost+found inode */
1424 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1425 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1426 __u8 s_wtime_hi;
1427 __u8 s_mtime_hi;
1428 __u8 s_mkfs_time_hi;
1429 __u8 s_lastcheck_hi;
1430 __u8 s_first_error_time_hi;
1431 __u8 s_last_error_time_hi;
1432 __u8 s_first_error_errcode;
1433 __u8 s_last_error_errcode;
1434 __le16 s_encoding; /* Filename charset encoding */
1435 __le16 s_encoding_flags; /* Filename charset encoding flags */
1436 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
1437 __le32 s_reserved[94]; /* Padding to the end of the block */
1438 __le32 s_checksum; /* crc32c(superblock) */
1439 };
1440
1441 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1442
1443 #ifdef __KERNEL__
1444
1445 /* Number of quota types we support */
1446 #define EXT4_MAXQUOTAS 3
1447
1448 #define EXT4_ENC_UTF8_12_1 1
1449
1450 /* Types of ext4 journal triggers */
1451 enum ext4_journal_trigger_type {
1452 EXT4_JTR_ORPHAN_FILE,
1453 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
1454 };
1455
1456 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1457
1458 struct ext4_journal_trigger {
1459 struct jbd2_buffer_trigger_type tr_triggers;
1460 struct super_block *sb;
1461 };
1462
EXT4_TRIGGER(struct jbd2_buffer_trigger_type * trigger)1463 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1464 struct jbd2_buffer_trigger_type *trigger)
1465 {
1466 return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1467 }
1468
1469 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1470
1471 /* Structure at the tail of orphan block */
1472 struct ext4_orphan_block_tail {
1473 __le32 ob_magic;
1474 __le32 ob_checksum;
1475 };
1476
ext4_inodes_per_orphan_block(struct super_block * sb)1477 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1478 {
1479 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1480 sizeof(u32);
1481 }
1482
1483 struct ext4_orphan_block {
1484 atomic_t ob_free_entries; /* Number of free orphan entries in block */
1485 struct buffer_head *ob_bh; /* Buffer for orphan block */
1486 };
1487
1488 /*
1489 * Info about orphan file.
1490 */
1491 struct ext4_orphan_info {
1492 int of_blocks; /* Number of orphan blocks in a file */
1493 __u32 of_csum_seed; /* Checksum seed for orphan file */
1494 struct ext4_orphan_block *of_binfo; /* Array with info about orphan
1495 * file blocks */
1496 };
1497
1498 /*
1499 * fourth extended-fs super-block data in memory
1500 */
1501 struct ext4_sb_info {
1502 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1503 unsigned long s_inodes_per_block;/* Number of inodes per block */
1504 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1505 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1506 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1507 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1508 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1509 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1510 ext4_group_t s_groups_count; /* Number of groups in the fs */
1511 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1512 unsigned long s_overhead; /* # of fs overhead clusters */
1513 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1514 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1515 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1516 struct buffer_head * s_sbh; /* Buffer containing the super block */
1517 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1518 struct buffer_head * __rcu *s_group_desc;
1519 unsigned int s_mount_opt;
1520 unsigned int s_mount_opt2;
1521 unsigned long s_mount_flags;
1522 unsigned int s_def_mount_opt;
1523 ext4_fsblk_t s_sb_block;
1524 atomic64_t s_resv_clusters;
1525 kuid_t s_resuid;
1526 kgid_t s_resgid;
1527 unsigned short s_mount_state;
1528 unsigned short s_pad;
1529 int s_addr_per_block_bits;
1530 int s_desc_per_block_bits;
1531 int s_inode_size;
1532 int s_first_ino;
1533 unsigned int s_inode_readahead_blks;
1534 unsigned int s_inode_goal;
1535 u32 s_hash_seed[4];
1536 int s_def_hash_version;
1537 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1538 struct percpu_counter s_freeclusters_counter;
1539 struct percpu_counter s_freeinodes_counter;
1540 struct percpu_counter s_dirs_counter;
1541 struct percpu_counter s_dirtyclusters_counter;
1542 struct percpu_counter s_sra_exceeded_retry_limit;
1543 struct blockgroup_lock *s_blockgroup_lock;
1544 struct proc_dir_entry *s_proc;
1545 struct kobject s_kobj;
1546 struct completion s_kobj_unregister;
1547 struct super_block *s_sb;
1548 struct buffer_head *s_mmp_bh;
1549
1550 /* Journaling */
1551 struct journal_s *s_journal;
1552 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1553 struct mutex s_orphan_lock; /* Protects on disk list changes */
1554 struct list_head s_orphan; /* List of orphaned inodes in on disk
1555 list */
1556 struct ext4_orphan_info s_orphan_info;
1557 unsigned long s_commit_interval;
1558 u32 s_max_batch_time;
1559 u32 s_min_batch_time;
1560 struct block_device *s_journal_bdev;
1561 #ifdef CONFIG_QUOTA
1562 /* Names of quota files with journalled quota */
1563 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1564 int s_jquota_fmt; /* Format of quota to use */
1565 #endif
1566 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1567 struct ext4_system_blocks __rcu *s_system_blks;
1568
1569 #ifdef EXTENTS_STATS
1570 /* ext4 extents stats */
1571 unsigned long s_ext_min;
1572 unsigned long s_ext_max;
1573 unsigned long s_depth_max;
1574 spinlock_t s_ext_stats_lock;
1575 unsigned long s_ext_blocks;
1576 unsigned long s_ext_extents;
1577 #endif
1578
1579 /* for buddy allocator */
1580 struct ext4_group_info ** __rcu *s_group_info;
1581 struct inode *s_buddy_cache;
1582 spinlock_t s_md_lock;
1583 unsigned short *s_mb_offsets;
1584 unsigned int *s_mb_maxs;
1585 unsigned int s_group_info_size;
1586 unsigned int s_mb_free_pending;
1587 struct list_head s_freed_data_list; /* List of blocks to be freed
1588 after commit completed */
1589 struct list_head s_discard_list;
1590 struct work_struct s_discard_work;
1591 atomic_t s_retry_alloc_pending;
1592 struct rb_root s_mb_avg_fragment_size_root;
1593 rwlock_t s_mb_rb_lock;
1594 struct list_head *s_mb_largest_free_orders;
1595 rwlock_t *s_mb_largest_free_orders_locks;
1596
1597 /* tunables */
1598 unsigned long s_stripe;
1599 unsigned int s_mb_max_linear_groups;
1600 unsigned int s_mb_stream_request;
1601 unsigned int s_mb_max_to_scan;
1602 unsigned int s_mb_min_to_scan;
1603 unsigned int s_mb_stats;
1604 unsigned int s_mb_order2_reqs;
1605 unsigned int s_mb_group_prealloc;
1606 unsigned int s_mb_max_inode_prealloc;
1607 unsigned int s_max_dir_size_kb;
1608 /* where last allocation was done - for stream allocation */
1609 unsigned long s_mb_last_group;
1610 unsigned long s_mb_last_start;
1611 unsigned int s_mb_prefetch;
1612 unsigned int s_mb_prefetch_limit;
1613
1614 /* stats for buddy allocator */
1615 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1616 atomic_t s_bal_success; /* we found long enough chunks */
1617 atomic_t s_bal_allocated; /* in blocks */
1618 atomic_t s_bal_ex_scanned; /* total extents scanned */
1619 atomic_t s_bal_groups_scanned; /* number of groups scanned */
1620 atomic_t s_bal_goals; /* goal hits */
1621 atomic_t s_bal_breaks; /* too long searches */
1622 atomic_t s_bal_2orders; /* 2^order hits */
1623 atomic_t s_bal_cr0_bad_suggestions;
1624 atomic_t s_bal_cr1_bad_suggestions;
1625 atomic64_t s_bal_cX_groups_considered[4];
1626 atomic64_t s_bal_cX_hits[4];
1627 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */
1628 atomic_t s_mb_buddies_generated; /* number of buddies generated */
1629 atomic64_t s_mb_generation_time;
1630 atomic_t s_mb_lost_chunks;
1631 atomic_t s_mb_preallocated;
1632 atomic_t s_mb_discarded;
1633 atomic_t s_lock_busy;
1634
1635 /* locality groups */
1636 struct ext4_locality_group __percpu *s_locality_groups;
1637
1638 /* for write statistics */
1639 unsigned long s_sectors_written_start;
1640 u64 s_kbytes_written;
1641
1642 /* the size of zero-out chunk */
1643 unsigned int s_extent_max_zeroout_kb;
1644
1645 unsigned int s_log_groups_per_flex;
1646 struct flex_groups * __rcu *s_flex_groups;
1647 ext4_group_t s_flex_groups_allocated;
1648
1649 /* workqueue for reserved extent conversions (buffered io) */
1650 struct workqueue_struct *rsv_conversion_wq;
1651
1652 /* timer for periodic error stats printing */
1653 struct timer_list s_err_report;
1654
1655 /* Lazy inode table initialization info */
1656 struct ext4_li_request *s_li_request;
1657 /* Wait multiplier for lazy initialization thread */
1658 unsigned int s_li_wait_mult;
1659
1660 /* Kernel thread for multiple mount protection */
1661 struct task_struct *s_mmp_tsk;
1662
1663 /* record the last minlen when FITRIM is called. */
1664 unsigned long s_last_trim_minblks;
1665
1666 /* Reference to checksum algorithm driver via cryptoapi */
1667 struct crypto_shash *s_chksum_driver;
1668
1669 /* Precomputed FS UUID checksum for seeding other checksums */
1670 __u32 s_csum_seed;
1671
1672 /* Reclaim extents from extent status tree */
1673 struct shrinker s_es_shrinker;
1674 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1675 long s_es_nr_inode;
1676 struct ext4_es_stats s_es_stats;
1677 struct mb_cache *s_ea_block_cache;
1678 struct mb_cache *s_ea_inode_cache;
1679 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1680
1681 /* Journal triggers for checksum computation */
1682 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1683
1684 /* Ratelimit ext4 messages. */
1685 struct ratelimit_state s_err_ratelimit_state;
1686 struct ratelimit_state s_warning_ratelimit_state;
1687 struct ratelimit_state s_msg_ratelimit_state;
1688 atomic_t s_warning_count;
1689 atomic_t s_msg_count;
1690
1691 /* Encryption policy for '-o test_dummy_encryption' */
1692 struct fscrypt_dummy_policy s_dummy_enc_policy;
1693
1694 /*
1695 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1696 * or EXTENTS flag.
1697 */
1698 struct percpu_rw_semaphore s_writepages_rwsem;
1699 struct dax_device *s_daxdev;
1700 u64 s_dax_part_off;
1701 #ifdef CONFIG_EXT4_DEBUG
1702 unsigned long s_simulate_fail;
1703 #endif
1704 /* Record the errseq of the backing block device */
1705 errseq_t s_bdev_wb_err;
1706 spinlock_t s_bdev_wb_lock;
1707
1708 /* Information about errors that happened during this mount */
1709 spinlock_t s_error_lock;
1710 int s_add_error_count;
1711 int s_first_error_code;
1712 __u32 s_first_error_line;
1713 __u32 s_first_error_ino;
1714 __u64 s_first_error_block;
1715 const char *s_first_error_func;
1716 time64_t s_first_error_time;
1717 int s_last_error_code;
1718 __u32 s_last_error_line;
1719 __u32 s_last_error_ino;
1720 __u64 s_last_error_block;
1721 const char *s_last_error_func;
1722 time64_t s_last_error_time;
1723 /*
1724 * If we are in a context where we cannot update error information in
1725 * the on-disk superblock, we queue this work to do it.
1726 */
1727 struct work_struct s_error_work;
1728
1729 /* Ext4 fast commit sub transaction ID */
1730 atomic_t s_fc_subtid;
1731
1732 /*
1733 * After commit starts, the main queue gets locked, and the further
1734 * updates get added in the staging queue.
1735 */
1736 #define FC_Q_MAIN 0
1737 #define FC_Q_STAGING 1
1738 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1739 * that have data changes in them.
1740 */
1741 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1742 unsigned int s_fc_bytes;
1743 /*
1744 * Main fast commit lock. This lock protects accesses to the
1745 * following fields:
1746 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1747 */
1748 spinlock_t s_fc_lock;
1749 struct buffer_head *s_fc_bh;
1750 struct ext4_fc_stats s_fc_stats;
1751 tid_t s_fc_ineligible_tid;
1752 #ifdef CONFIG_EXT4_DEBUG
1753 int s_fc_debug_max_replay;
1754 #endif
1755 struct ext4_fc_replay_state s_fc_replay_state;
1756 };
1757
EXT4_SB(struct super_block * sb)1758 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1759 {
1760 return sb->s_fs_info;
1761 }
EXT4_I(struct inode * inode)1762 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1763 {
1764 return container_of(inode, struct ext4_inode_info, vfs_inode);
1765 }
1766
ext4_valid_inum(struct super_block * sb,unsigned long ino)1767 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1768 {
1769 return ino == EXT4_ROOT_INO ||
1770 (ino >= EXT4_FIRST_INO(sb) &&
1771 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1772 }
1773
1774 /*
1775 * Returns: sbi->field[index]
1776 * Used to access an array element from the following sbi fields which require
1777 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1778 * - s_group_desc
1779 * - s_group_info
1780 * - s_flex_group
1781 */
1782 #define sbi_array_rcu_deref(sbi, field, index) \
1783 ({ \
1784 typeof(*((sbi)->field)) _v; \
1785 rcu_read_lock(); \
1786 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1787 rcu_read_unlock(); \
1788 _v; \
1789 })
1790
1791 /*
1792 * run-time mount flags
1793 */
1794 enum {
1795 EXT4_MF_MNTDIR_SAMPLED,
1796 EXT4_MF_FS_ABORTED, /* Fatal error detected */
1797 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */
1798 };
1799
ext4_set_mount_flag(struct super_block * sb,int bit)1800 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1801 {
1802 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1803 }
1804
ext4_clear_mount_flag(struct super_block * sb,int bit)1805 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1806 {
1807 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1808 }
1809
ext4_test_mount_flag(struct super_block * sb,int bit)1810 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1811 {
1812 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1813 }
1814
1815
1816 /*
1817 * Simulate_fail codes
1818 */
1819 #define EXT4_SIM_BBITMAP_EIO 1
1820 #define EXT4_SIM_BBITMAP_CRC 2
1821 #define EXT4_SIM_IBITMAP_EIO 3
1822 #define EXT4_SIM_IBITMAP_CRC 4
1823 #define EXT4_SIM_INODE_EIO 5
1824 #define EXT4_SIM_INODE_CRC 6
1825 #define EXT4_SIM_DIRBLOCK_EIO 7
1826 #define EXT4_SIM_DIRBLOCK_CRC 8
1827
ext4_simulate_fail(struct super_block * sb,unsigned long code)1828 static inline bool ext4_simulate_fail(struct super_block *sb,
1829 unsigned long code)
1830 {
1831 #ifdef CONFIG_EXT4_DEBUG
1832 struct ext4_sb_info *sbi = EXT4_SB(sb);
1833
1834 if (unlikely(sbi->s_simulate_fail == code)) {
1835 sbi->s_simulate_fail = 0;
1836 return true;
1837 }
1838 #endif
1839 return false;
1840 }
1841
ext4_simulate_fail_bh(struct super_block * sb,struct buffer_head * bh,unsigned long code)1842 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1843 struct buffer_head *bh,
1844 unsigned long code)
1845 {
1846 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1847 clear_buffer_uptodate(bh);
1848 }
1849
1850 /*
1851 * Error number codes for s_{first,last}_error_errno
1852 *
1853 * Linux errno numbers are architecture specific, so we need to translate
1854 * them into something which is architecture independent. We don't define
1855 * codes for all errno's; just the ones which are most likely to be the cause
1856 * of an ext4_error() call.
1857 */
1858 #define EXT4_ERR_UNKNOWN 1
1859 #define EXT4_ERR_EIO 2
1860 #define EXT4_ERR_ENOMEM 3
1861 #define EXT4_ERR_EFSBADCRC 4
1862 #define EXT4_ERR_EFSCORRUPTED 5
1863 #define EXT4_ERR_ENOSPC 6
1864 #define EXT4_ERR_ENOKEY 7
1865 #define EXT4_ERR_EROFS 8
1866 #define EXT4_ERR_EFBIG 9
1867 #define EXT4_ERR_EEXIST 10
1868 #define EXT4_ERR_ERANGE 11
1869 #define EXT4_ERR_EOVERFLOW 12
1870 #define EXT4_ERR_EBUSY 13
1871 #define EXT4_ERR_ENOTDIR 14
1872 #define EXT4_ERR_ENOTEMPTY 15
1873 #define EXT4_ERR_ESHUTDOWN 16
1874 #define EXT4_ERR_EFAULT 17
1875
1876 /*
1877 * Inode dynamic state flags
1878 */
1879 enum {
1880 EXT4_STATE_JDATA, /* journaled data exists */
1881 EXT4_STATE_NEW, /* inode is newly created */
1882 EXT4_STATE_XATTR, /* has in-inode xattrs */
1883 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1884 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1885 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1886 EXT4_STATE_NEWENTRY, /* File just added to dir */
1887 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1888 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1889 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1890 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1891 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1892 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
1893 };
1894
1895 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1896 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1897 { \
1898 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1899 } \
1900 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1901 { \
1902 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1903 } \
1904 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1905 { \
1906 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1907 }
1908
1909 /* Add these declarations here only so that these functions can be
1910 * found by name. Otherwise, they are very hard to locate. */
1911 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1912 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1913 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1914 EXT4_INODE_BIT_FNS(flag, flags, 0)
1915
1916 /* Add these declarations here only so that these functions can be
1917 * found by name. Otherwise, they are very hard to locate. */
1918 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1919 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1920 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1921 #if (BITS_PER_LONG < 64)
1922 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1923
ext4_clear_state_flags(struct ext4_inode_info * ei)1924 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1925 {
1926 (ei)->i_state_flags = 0;
1927 }
1928 #else
1929 EXT4_INODE_BIT_FNS(state, flags, 32)
1930
ext4_clear_state_flags(struct ext4_inode_info * ei)1931 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1932 {
1933 /* We depend on the fact that callers will set i_flags */
1934 }
1935 #endif
1936 #else
1937 /* Assume that user mode programs are passing in an ext4fs superblock, not
1938 * a kernel struct super_block. This will allow us to call the feature-test
1939 * macros from user land. */
1940 #define EXT4_SB(sb) (sb)
1941 #endif
1942
ext4_verity_in_progress(struct inode * inode)1943 static inline bool ext4_verity_in_progress(struct inode *inode)
1944 {
1945 return IS_ENABLED(CONFIG_FS_VERITY) &&
1946 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1947 }
1948
1949 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1950
1951 /*
1952 * Codes for operating systems
1953 */
1954 #define EXT4_OS_LINUX 0
1955 #define EXT4_OS_HURD 1
1956 #define EXT4_OS_MASIX 2
1957 #define EXT4_OS_FREEBSD 3
1958 #define EXT4_OS_LITES 4
1959
1960 /*
1961 * Revision levels
1962 */
1963 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1964 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1965
1966 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1967
1968 #define EXT4_GOOD_OLD_INODE_SIZE 128
1969
1970 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1971 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1972 #define EXT4_TIMESTAMP_MIN S32_MIN
1973
1974 /*
1975 * Feature set definitions
1976 */
1977
1978 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1979 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1980 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1981 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1982 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1983 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1984 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1985 /*
1986 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1987 * incompatible only if fast commit blocks are present in the FS. Since we
1988 * clear the journal (and thus the fast commit blocks), we don't mark FS as
1989 * incompatible. We also have a JBD2 incompat feature, which gets set when
1990 * there are fast commit blocks present in the journal.
1991 */
1992 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
1993 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1994 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
1995
1996 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1997 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1998 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1999 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
2000 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
2001 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
2002 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
2003 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
2004 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
2005 /*
2006 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
2007 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2008 * all other data structures' checksums. However, the METADATA_CSUM and
2009 * GDT_CSUM bits are mutually exclusive.
2010 */
2011 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
2012 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
2013 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
2014 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
2015 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be
2016 non-empty */
2017
2018 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
2019 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
2020 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
2021 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
2022 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
2023 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
2024 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
2025 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
2026 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
2027 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
2028 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
2029 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
2030 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
2031 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
2032 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
2033 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
2034
2035 extern void ext4_update_dynamic_rev(struct super_block *sb);
2036
2037 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2038 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2039 { \
2040 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2041 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2042 } \
2043 static inline void ext4_set_feature_##name(struct super_block *sb) \
2044 { \
2045 ext4_update_dynamic_rev(sb); \
2046 EXT4_SB(sb)->s_es->s_feature_compat |= \
2047 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2048 } \
2049 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2050 { \
2051 EXT4_SB(sb)->s_es->s_feature_compat &= \
2052 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2053 }
2054
2055 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2056 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2057 { \
2058 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2059 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2060 } \
2061 static inline void ext4_set_feature_##name(struct super_block *sb) \
2062 { \
2063 ext4_update_dynamic_rev(sb); \
2064 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2065 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2066 } \
2067 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2068 { \
2069 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2070 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2071 }
2072
2073 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2074 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2075 { \
2076 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2077 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2078 } \
2079 static inline void ext4_set_feature_##name(struct super_block *sb) \
2080 { \
2081 ext4_update_dynamic_rev(sb); \
2082 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2083 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2084 } \
2085 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2086 { \
2087 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2088 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2089 }
2090
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,DIR_PREALLOC)2091 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2092 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2093 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2094 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2095 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2096 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2097 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2098 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2099 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2100 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
2101
2102 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2103 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2104 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2105 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2106 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2107 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2108 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2109 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2110 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2114 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2115 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
2116
2117 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2118 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2119 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2120 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2121 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2122 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2123 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2124 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2125 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2126 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2131 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2132 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2133
2134 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2135 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2136 EXT4_FEATURE_INCOMPAT_META_BG)
2137 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2138 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2139 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2140
2141 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2142 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2143 EXT4_FEATURE_INCOMPAT_RECOVER| \
2144 EXT4_FEATURE_INCOMPAT_META_BG)
2145 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2146 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2147 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2148
2149 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2150 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2151 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2152 EXT4_FEATURE_INCOMPAT_RECOVER| \
2153 EXT4_FEATURE_INCOMPAT_META_BG| \
2154 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2155 EXT4_FEATURE_INCOMPAT_64BIT| \
2156 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2157 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2158 EXT4_FEATURE_INCOMPAT_MMP | \
2159 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2160 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2161 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2162 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2163 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2164 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2165 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2166 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2167 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2168 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2169 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2170 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2171 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2172 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2173 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2174 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2175 EXT4_FEATURE_RO_COMPAT_VERITY |\
2176 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2177
2178 #define EXTN_FEATURE_FUNCS(ver) \
2179 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2180 { \
2181 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2182 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2183 } \
2184 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2185 { \
2186 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2187 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2188 } \
2189 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2190 { \
2191 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2192 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2193 }
2194
2195 EXTN_FEATURE_FUNCS(2)
2196 EXTN_FEATURE_FUNCS(3)
2197 EXTN_FEATURE_FUNCS(4)
2198
2199 static inline bool ext4_has_compat_features(struct super_block *sb)
2200 {
2201 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2202 }
ext4_has_ro_compat_features(struct super_block * sb)2203 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2204 {
2205 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2206 }
ext4_has_incompat_features(struct super_block * sb)2207 static inline bool ext4_has_incompat_features(struct super_block *sb)
2208 {
2209 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2210 }
2211
2212 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2213
2214 /*
2215 * Superblock flags
2216 */
2217 #define EXT4_FLAGS_RESIZING 0
2218 #define EXT4_FLAGS_SHUTDOWN 1
2219 #define EXT4_FLAGS_BDEV_IS_DAX 2
2220
ext4_forced_shutdown(struct ext4_sb_info * sbi)2221 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2222 {
2223 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2224 }
2225
2226 /*
2227 * Default values for user and/or group using reserved blocks
2228 */
2229 #define EXT4_DEF_RESUID 0
2230 #define EXT4_DEF_RESGID 0
2231
2232 /*
2233 * Default project ID
2234 */
2235 #define EXT4_DEF_PROJID 0
2236
2237 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2238
2239 /*
2240 * Default mount options
2241 */
2242 #define EXT4_DEFM_DEBUG 0x0001
2243 #define EXT4_DEFM_BSDGROUPS 0x0002
2244 #define EXT4_DEFM_XATTR_USER 0x0004
2245 #define EXT4_DEFM_ACL 0x0008
2246 #define EXT4_DEFM_UID16 0x0010
2247 #define EXT4_DEFM_JMODE 0x0060
2248 #define EXT4_DEFM_JMODE_DATA 0x0020
2249 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2250 #define EXT4_DEFM_JMODE_WBACK 0x0060
2251 #define EXT4_DEFM_NOBARRIER 0x0100
2252 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2253 #define EXT4_DEFM_DISCARD 0x0400
2254 #define EXT4_DEFM_NODELALLOC 0x0800
2255
2256 /*
2257 * Default journal batch times
2258 */
2259 #define EXT4_DEF_MIN_BATCH_TIME 0
2260 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2261
2262 /*
2263 * Minimum number of groups in a flexgroup before we separate out
2264 * directories into the first block group of a flexgroup
2265 */
2266 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2267
2268 /*
2269 * Structure of a directory entry
2270 */
2271 #define EXT4_NAME_LEN 255
2272 /*
2273 * Base length of the ext4 directory entry excluding the name length
2274 */
2275 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2276
2277 struct ext4_dir_entry {
2278 __le32 inode; /* Inode number */
2279 __le16 rec_len; /* Directory entry length */
2280 __le16 name_len; /* Name length */
2281 char name[EXT4_NAME_LEN]; /* File name */
2282 };
2283
2284
2285 /*
2286 * Encrypted Casefolded entries require saving the hash on disk. This structure
2287 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2288 * boundary.
2289 */
2290 struct ext4_dir_entry_hash {
2291 __le32 hash;
2292 __le32 minor_hash;
2293 };
2294
2295 /*
2296 * The new version of the directory entry. Since EXT4 structures are
2297 * stored in intel byte order, and the name_len field could never be
2298 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2299 * file_type field.
2300 */
2301 struct ext4_dir_entry_2 {
2302 __le32 inode; /* Inode number */
2303 __le16 rec_len; /* Directory entry length */
2304 __u8 name_len; /* Name length */
2305 __u8 file_type; /* See file type macros EXT4_FT_* below */
2306 char name[EXT4_NAME_LEN]; /* File name */
2307 };
2308
2309 /*
2310 * Access the hashes at the end of ext4_dir_entry_2
2311 */
2312 #define EXT4_DIRENT_HASHES(entry) \
2313 ((struct ext4_dir_entry_hash *) \
2314 (((void *)(entry)) + \
2315 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2316 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2317 #define EXT4_DIRENT_MINOR_HASH(entry) \
2318 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2319
ext4_hash_in_dirent(const struct inode * inode)2320 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2321 {
2322 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2323 }
2324
2325 /*
2326 * This is a bogus directory entry at the end of each leaf block that
2327 * records checksums.
2328 */
2329 struct ext4_dir_entry_tail {
2330 __le32 det_reserved_zero1; /* Pretend to be unused */
2331 __le16 det_rec_len; /* 12 */
2332 __u8 det_reserved_zero2; /* Zero name length */
2333 __u8 det_reserved_ft; /* 0xDE, fake file type */
2334 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2335 };
2336
2337 #define EXT4_DIRENT_TAIL(block, blocksize) \
2338 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2339 ((blocksize) - \
2340 sizeof(struct ext4_dir_entry_tail))))
2341
2342 /*
2343 * Ext4 directory file types. Only the low 3 bits are used. The
2344 * other bits are reserved for now.
2345 */
2346 #define EXT4_FT_UNKNOWN 0
2347 #define EXT4_FT_REG_FILE 1
2348 #define EXT4_FT_DIR 2
2349 #define EXT4_FT_CHRDEV 3
2350 #define EXT4_FT_BLKDEV 4
2351 #define EXT4_FT_FIFO 5
2352 #define EXT4_FT_SOCK 6
2353 #define EXT4_FT_SYMLINK 7
2354
2355 #define EXT4_FT_MAX 8
2356
2357 #define EXT4_FT_DIR_CSUM 0xDE
2358
2359 /*
2360 * EXT4_DIR_PAD defines the directory entries boundaries
2361 *
2362 * NOTE: It must be a multiple of 4
2363 */
2364 #define EXT4_DIR_PAD 4
2365 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2366 #define EXT4_MAX_REC_LEN ((1<<16)-1)
2367
2368 /*
2369 * The rec_len is dependent on the type of directory. Directories that are
2370 * casefolded and encrypted need to store the hash as well, so we add room for
2371 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2372 * pass NULL for dir, as those entries do not use the extra fields.
2373 */
ext4_dir_rec_len(__u8 name_len,const struct inode * dir)2374 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2375 const struct inode *dir)
2376 {
2377 int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2378
2379 if (dir && ext4_hash_in_dirent(dir))
2380 rec_len += sizeof(struct ext4_dir_entry_hash);
2381 return (rec_len & ~EXT4_DIR_ROUND);
2382 }
2383
2384 /*
2385 * If we ever get support for fs block sizes > page_size, we'll need
2386 * to remove the #if statements in the next two functions...
2387 */
2388 static inline unsigned int
ext4_rec_len_from_disk(__le16 dlen,unsigned blocksize)2389 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2390 {
2391 unsigned len = le16_to_cpu(dlen);
2392
2393 #if (PAGE_SIZE >= 65536)
2394 if (len == EXT4_MAX_REC_LEN || len == 0)
2395 return blocksize;
2396 return (len & 65532) | ((len & 3) << 16);
2397 #else
2398 return len;
2399 #endif
2400 }
2401
ext4_rec_len_to_disk(unsigned len,unsigned blocksize)2402 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2403 {
2404 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2405 #if (PAGE_SIZE >= 65536)
2406 if (len < 65536)
2407 return cpu_to_le16(len);
2408 if (len == blocksize) {
2409 if (blocksize == 65536)
2410 return cpu_to_le16(EXT4_MAX_REC_LEN);
2411 else
2412 return cpu_to_le16(0);
2413 }
2414 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2415 #else
2416 return cpu_to_le16(len);
2417 #endif
2418 }
2419
2420 /*
2421 * Hash Tree Directory indexing
2422 * (c) Daniel Phillips, 2001
2423 */
2424
2425 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2426 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2427 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2428 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2429 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2430
2431 /* Legal values for the dx_root hash_version field: */
2432
2433 #define DX_HASH_LEGACY 0
2434 #define DX_HASH_HALF_MD4 1
2435 #define DX_HASH_TEA 2
2436 #define DX_HASH_LEGACY_UNSIGNED 3
2437 #define DX_HASH_HALF_MD4_UNSIGNED 4
2438 #define DX_HASH_TEA_UNSIGNED 5
2439 #define DX_HASH_SIPHASH 6
2440
ext4_chksum(struct ext4_sb_info * sbi,u32 crc,const void * address,unsigned int length)2441 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2442 const void *address, unsigned int length)
2443 {
2444 struct {
2445 struct shash_desc shash;
2446 char ctx[4];
2447 } desc;
2448
2449 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2450
2451 desc.shash.tfm = sbi->s_chksum_driver;
2452 *(u32 *)desc.ctx = crc;
2453
2454 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2455
2456 return *(u32 *)desc.ctx;
2457 }
2458
2459 #ifdef __KERNEL__
2460
2461 /* hash info structure used by the directory hash */
2462 struct dx_hash_info
2463 {
2464 u32 hash;
2465 u32 minor_hash;
2466 int hash_version;
2467 u32 *seed;
2468 };
2469
2470
2471 /* 32 and 64 bit signed EOF for dx directories */
2472 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2473 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2474
2475
2476 /*
2477 * Control parameters used by ext4_htree_next_block
2478 */
2479 #define HASH_NB_ALWAYS 1
2480
2481 struct ext4_filename {
2482 const struct qstr *usr_fname;
2483 struct fscrypt_str disk_name;
2484 struct dx_hash_info hinfo;
2485 #ifdef CONFIG_FS_ENCRYPTION
2486 struct fscrypt_str crypto_buf;
2487 #endif
2488 #if IS_ENABLED(CONFIG_UNICODE)
2489 struct fscrypt_str cf_name;
2490 #endif
2491 };
2492
2493 #define fname_name(p) ((p)->disk_name.name)
2494 #define fname_usr_name(p) ((p)->usr_fname->name)
2495 #define fname_len(p) ((p)->disk_name.len)
2496
2497 /*
2498 * Describe an inode's exact location on disk and in memory
2499 */
2500 struct ext4_iloc
2501 {
2502 struct buffer_head *bh;
2503 unsigned long offset;
2504 ext4_group_t block_group;
2505 };
2506
ext4_raw_inode(struct ext4_iloc * iloc)2507 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2508 {
2509 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2510 }
2511
ext4_is_quota_file(struct inode * inode)2512 static inline bool ext4_is_quota_file(struct inode *inode)
2513 {
2514 return IS_NOQUOTA(inode) &&
2515 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2516 }
2517
2518 /*
2519 * This structure is stuffed into the struct file's private_data field
2520 * for directories. It is where we put information so that we can do
2521 * readdir operations in hash tree order.
2522 */
2523 struct dir_private_info {
2524 struct rb_root root;
2525 struct rb_node *curr_node;
2526 struct fname *extra_fname;
2527 loff_t last_pos;
2528 __u32 curr_hash;
2529 __u32 curr_minor_hash;
2530 __u32 next_hash;
2531 };
2532
2533 /* calculate the first block number of the group */
2534 static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block * sb,ext4_group_t group_no)2535 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2536 {
2537 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2538 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2539 }
2540
2541 /*
2542 * Special error return code only used by dx_probe() and its callers.
2543 */
2544 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2545
2546 /* htree levels for ext4 */
2547 #define EXT4_HTREE_LEVEL_COMPAT 2
2548 #define EXT4_HTREE_LEVEL 3
2549
ext4_dir_htree_level(struct super_block * sb)2550 static inline int ext4_dir_htree_level(struct super_block *sb)
2551 {
2552 return ext4_has_feature_largedir(sb) ?
2553 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2554 }
2555
2556 /*
2557 * Timeout and state flag for lazy initialization inode thread.
2558 */
2559 #define EXT4_DEF_LI_WAIT_MULT 10
2560 #define EXT4_DEF_LI_MAX_START_DELAY 5
2561 #define EXT4_LAZYINIT_QUIT 0x0001
2562 #define EXT4_LAZYINIT_RUNNING 0x0002
2563
2564 /*
2565 * Lazy inode table initialization info
2566 */
2567 struct ext4_lazy_init {
2568 unsigned long li_state;
2569 struct list_head li_request_list;
2570 struct mutex li_list_mtx;
2571 };
2572
2573 enum ext4_li_mode {
2574 EXT4_LI_MODE_PREFETCH_BBITMAP,
2575 EXT4_LI_MODE_ITABLE,
2576 };
2577
2578 struct ext4_li_request {
2579 struct super_block *lr_super;
2580 enum ext4_li_mode lr_mode;
2581 ext4_group_t lr_first_not_zeroed;
2582 ext4_group_t lr_next_group;
2583 struct list_head lr_request;
2584 unsigned long lr_next_sched;
2585 unsigned long lr_timeout;
2586 };
2587
2588 struct ext4_features {
2589 struct kobject f_kobj;
2590 struct completion f_kobj_unregister;
2591 };
2592
2593 /*
2594 * This structure will be used for multiple mount protection. It will be
2595 * written into the block number saved in the s_mmp_block field in the
2596 * superblock. Programs that check MMP should assume that if
2597 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2598 * to use the filesystem, regardless of how old the timestamp is.
2599 */
2600 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2601 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2602 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2603 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2604
2605 struct mmp_struct {
2606 __le32 mmp_magic; /* Magic number for MMP */
2607 __le32 mmp_seq; /* Sequence no. updated periodically */
2608
2609 /*
2610 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2611 * purposes and do not affect the correctness of the algorithm
2612 */
2613 __le64 mmp_time; /* Time last updated */
2614 char mmp_nodename[64]; /* Node which last updated MMP block */
2615 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2616
2617 /*
2618 * mmp_check_interval is used to verify if the MMP block has been
2619 * updated on the block device. The value is updated based on the
2620 * maximum time to write the MMP block during an update cycle.
2621 */
2622 __le16 mmp_check_interval;
2623
2624 __le16 mmp_pad1;
2625 __le32 mmp_pad2[226];
2626 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2627 };
2628
2629 /* arguments passed to the mmp thread */
2630 struct mmpd_data {
2631 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2632 struct super_block *sb; /* super block of the fs */
2633 };
2634
2635 /*
2636 * Check interval multiplier
2637 * The MMP block is written every update interval and initially checked every
2638 * update interval x the multiplier (the value is then adapted based on the
2639 * write latency). The reason is that writes can be delayed under load and we
2640 * don't want readers to incorrectly assume that the filesystem is no longer
2641 * in use.
2642 */
2643 #define EXT4_MMP_CHECK_MULT 2UL
2644
2645 /*
2646 * Minimum interval for MMP checking in seconds.
2647 */
2648 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2649
2650 /*
2651 * Maximum interval for MMP checking in seconds.
2652 */
2653 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2654
2655 /*
2656 * Function prototypes
2657 */
2658
2659 /*
2660 * Ok, these declarations are also in <linux/kernel.h> but none of the
2661 * ext4 source programs needs to include it so they are duplicated here.
2662 */
2663 # define NORET_TYPE /**/
2664 # define ATTRIB_NORET __attribute__((noreturn))
2665 # define NORET_AND noreturn,
2666
2667 /* bitmap.c */
2668 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2669 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2670 struct ext4_group_desc *gdp,
2671 struct buffer_head *bh, int sz);
2672 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2673 struct ext4_group_desc *gdp,
2674 struct buffer_head *bh, int sz);
2675 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2676 struct ext4_group_desc *gdp,
2677 struct buffer_head *bh);
2678 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2679 struct ext4_group_desc *gdp,
2680 struct buffer_head *bh);
2681
2682 /* balloc.c */
2683 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2684 ext4_fsblk_t blocknr,
2685 ext4_group_t *blockgrpp,
2686 ext4_grpblk_t *offsetp);
2687 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2688 ext4_fsblk_t block);
2689
2690 extern unsigned int ext4_block_group(struct super_block *sb,
2691 ext4_fsblk_t blocknr);
2692 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2693 ext4_fsblk_t blocknr);
2694 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2695 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2696 ext4_group_t group);
2697 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2698 ext4_fsblk_t goal,
2699 unsigned int flags,
2700 unsigned long *count,
2701 int *errp);
2702 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2703 s64 nclusters, unsigned int flags);
2704 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2705 extern void ext4_check_blocks_bitmap(struct super_block *);
2706 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2707 ext4_group_t block_group,
2708 struct buffer_head ** bh);
2709 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2710
2711 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2712 ext4_group_t block_group,
2713 bool ignore_locked);
2714 extern int ext4_wait_block_bitmap(struct super_block *sb,
2715 ext4_group_t block_group,
2716 struct buffer_head *bh);
2717 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2718 ext4_group_t block_group);
2719 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2720 ext4_group_t block_group,
2721 struct ext4_group_desc *gdp);
2722 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2723
2724 #if IS_ENABLED(CONFIG_UNICODE)
2725 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2726 const struct qstr *iname,
2727 struct ext4_filename *fname);
2728 #endif
2729
2730 /* ext4 encryption related stuff goes here crypto.c */
2731 #ifdef CONFIG_FS_ENCRYPTION
2732 extern const struct fscrypt_operations ext4_cryptops;
2733
2734 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2735 int lookup, struct ext4_filename *fname);
2736
2737 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2738 struct ext4_filename *fname);
2739
2740 void ext4_fname_free_filename(struct ext4_filename *fname);
2741
2742 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2743
2744 #else /* !CONFIG_FS_ENCRYPTION */
ext4_fname_setup_filename(struct inode * dir,const struct qstr * iname,int lookup,struct ext4_filename * fname)2745 static inline int ext4_fname_setup_filename(struct inode *dir,
2746 const struct qstr *iname,
2747 int lookup,
2748 struct ext4_filename *fname)
2749 {
2750 int err = 0;
2751 fname->usr_fname = iname;
2752 fname->disk_name.name = (unsigned char *) iname->name;
2753 fname->disk_name.len = iname->len;
2754
2755 #if IS_ENABLED(CONFIG_UNICODE)
2756 err = ext4_fname_setup_ci_filename(dir, iname, fname);
2757 #endif
2758
2759 return err;
2760 }
2761
ext4_fname_prepare_lookup(struct inode * dir,struct dentry * dentry,struct ext4_filename * fname)2762 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2763 struct dentry *dentry,
2764 struct ext4_filename *fname)
2765 {
2766 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2767 }
2768
ext4_fname_free_filename(struct ext4_filename * fname)2769 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2770 {
2771 #if IS_ENABLED(CONFIG_UNICODE)
2772 kfree(fname->cf_name.name);
2773 fname->cf_name.name = NULL;
2774 #endif
2775 }
2776
ext4_ioctl_get_encryption_pwsalt(struct file * filp,void __user * arg)2777 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2778 void __user *arg)
2779 {
2780 return -EOPNOTSUPP;
2781 }
2782 #endif /* !CONFIG_FS_ENCRYPTION */
2783
2784 /* dir.c */
2785 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2786 struct file *,
2787 struct ext4_dir_entry_2 *,
2788 struct buffer_head *, char *, int,
2789 unsigned int);
2790 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2791 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2792 (de), (bh), (buf), (size), (offset)))
2793 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2794 __u32 minor_hash,
2795 struct ext4_dir_entry_2 *dirent,
2796 struct fscrypt_str *ent_name);
2797 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2798 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2799 struct buffer_head *bh,
2800 void *buf, int buf_size,
2801 struct ext4_filename *fname,
2802 struct ext4_dir_entry_2 **dest_de);
2803 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2804 struct ext4_dir_entry_2 *de,
2805 int buf_size,
2806 struct ext4_filename *fname);
ext4_update_dx_flag(struct inode * inode)2807 static inline void ext4_update_dx_flag(struct inode *inode)
2808 {
2809 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2810 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2811 /* ext4_iget() should have caught this... */
2812 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2813 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2814 }
2815 }
2816 static const unsigned char ext4_filetype_table[] = {
2817 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2818 };
2819
get_dtype(struct super_block * sb,int filetype)2820 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2821 {
2822 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2823 return DT_UNKNOWN;
2824
2825 return ext4_filetype_table[filetype];
2826 }
2827 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2828 void *buf, int buf_size);
2829
2830 /* fsync.c */
2831 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2832
2833 /* hash.c */
2834 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2835 struct dx_hash_info *hinfo);
2836
2837 /* ialloc.c */
2838 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2839 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2840 struct inode *, umode_t,
2841 const struct qstr *qstr, __u32 goal,
2842 uid_t *owner, __u32 i_flags,
2843 int handle_type, unsigned int line_no,
2844 int nblocks);
2845
2846 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2847 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \
2848 (goal), (owner), i_flags, 0, 0, 0)
2849 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2850 type, nblocks) \
2851 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2852 0, (type), __LINE__, (nblocks))
2853
2854
2855 extern void ext4_free_inode(handle_t *, struct inode *);
2856 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2857 extern unsigned long ext4_count_free_inodes(struct super_block *);
2858 extern unsigned long ext4_count_dirs(struct super_block *);
2859 extern void ext4_check_inodes_bitmap(struct super_block *);
2860 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2861 extern int ext4_init_inode_table(struct super_block *sb,
2862 ext4_group_t group, int barrier);
2863 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2864
2865 /* fast_commit.c */
2866 int ext4_fc_info_show(struct seq_file *seq, void *v);
2867 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2868 void ext4_fc_init_inode(struct inode *inode);
2869 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2870 ext4_lblk_t end);
2871 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2872 struct dentry *dentry);
2873 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2874 struct dentry *dentry);
2875 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2876 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2877 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2878 struct dentry *dentry);
2879 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2880 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2881 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2882 void ext4_fc_start_update(struct inode *inode);
2883 void ext4_fc_stop_update(struct inode *inode);
2884 void ext4_fc_del(struct inode *inode);
2885 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2886 void ext4_fc_replay_cleanup(struct super_block *sb);
2887 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2888 int __init ext4_fc_init_dentry_cache(void);
2889 void ext4_fc_destroy_dentry_cache(void);
2890 int ext4_fc_record_regions(struct super_block *sb, int ino,
2891 ext4_lblk_t lblk, ext4_fsblk_t pblk,
2892 int len, int replay);
2893
2894 /* mballoc.c */
2895 extern const struct seq_operations ext4_mb_seq_groups_ops;
2896 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2897 extern long ext4_mb_stats;
2898 extern long ext4_mb_max_to_scan;
2899 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2900 extern int ext4_mb_init(struct super_block *);
2901 extern int ext4_mb_release(struct super_block *);
2902 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2903 struct ext4_allocation_request *, int *);
2904 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2905 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2906 extern int __init ext4_init_mballoc(void);
2907 extern void ext4_exit_mballoc(void);
2908 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2909 ext4_group_t group,
2910 unsigned int nr, int *cnt);
2911 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2912 unsigned int nr);
2913
2914 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2915 struct buffer_head *bh, ext4_fsblk_t block,
2916 unsigned long count, int flags);
2917 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2918 ext4_group_t ngroups);
2919 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2920 ext4_group_t i, struct ext4_group_desc *desc);
2921 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2922 ext4_fsblk_t block, unsigned long count);
2923 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2924 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2925 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2926 int len, int state);
2927
2928 /* inode.c */
2929 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2930 struct ext4_inode_info *ei);
2931 int ext4_inode_is_fast_symlink(struct inode *inode);
2932 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2933 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2934 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2935 bool wait, struct buffer_head **bhs);
2936 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2937 struct buffer_head *bh_result, int create);
2938 int ext4_get_block(struct inode *inode, sector_t iblock,
2939 struct buffer_head *bh_result, int create);
2940 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2941 struct buffer_head *bh, int create);
2942 int ext4_walk_page_buffers(handle_t *handle,
2943 struct inode *inode,
2944 struct buffer_head *head,
2945 unsigned from,
2946 unsigned to,
2947 int *partial,
2948 int (*fn)(handle_t *handle, struct inode *inode,
2949 struct buffer_head *bh));
2950 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2951 struct buffer_head *bh);
2952 #define FALL_BACK_TO_NONDELALLOC 1
2953 #define CONVERT_INLINE_DATA 2
2954
2955 typedef enum {
2956 EXT4_IGET_NORMAL = 0,
2957 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2958 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2959 } ext4_iget_flags;
2960
2961 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2962 ext4_iget_flags flags, const char *function,
2963 unsigned int line);
2964
2965 #define ext4_iget(sb, ino, flags) \
2966 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2967
2968 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2969 extern int ext4_setattr(struct user_namespace *, struct dentry *,
2970 struct iattr *);
2971 extern int ext4_getattr(struct user_namespace *, const struct path *,
2972 struct kstat *, u32, unsigned int);
2973 extern void ext4_evict_inode(struct inode *);
2974 extern void ext4_clear_inode(struct inode *);
2975 extern int ext4_file_getattr(struct user_namespace *, const struct path *,
2976 struct kstat *, u32, unsigned int);
2977 extern int ext4_sync_inode(handle_t *, struct inode *);
2978 extern void ext4_dirty_inode(struct inode *, int);
2979 extern int ext4_change_inode_journal_flag(struct inode *, int);
2980 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2981 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2982 struct ext4_iloc *iloc);
2983 extern int ext4_inode_attach_jinode(struct inode *inode);
2984 extern int ext4_can_truncate(struct inode *inode);
2985 extern int ext4_truncate(struct inode *);
2986 extern int ext4_break_layouts(struct inode *);
2987 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2988 extern void ext4_set_inode_flags(struct inode *, bool init);
2989 extern int ext4_alloc_da_blocks(struct inode *inode);
2990 extern void ext4_set_aops(struct inode *inode);
2991 extern int ext4_writepage_trans_blocks(struct inode *);
2992 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2993 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2994 loff_t lstart, loff_t lend);
2995 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2996 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2997 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2998 extern void ext4_da_release_space(struct inode *inode, int to_free);
2999 extern void ext4_da_update_reserve_space(struct inode *inode,
3000 int used, int quota_claim);
3001 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3002 ext4_fsblk_t pblk, ext4_lblk_t len);
3003
3004 /* indirect.c */
3005 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3006 struct ext4_map_blocks *map, int flags);
3007 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3008 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3009 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3010 ext4_lblk_t start, ext4_lblk_t end);
3011
3012 /* ioctl.c */
3013 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3014 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3015 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3016 struct dentry *dentry, struct fileattr *fa);
3017 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3018 extern void ext4_reset_inode_seed(struct inode *inode);
3019 int ext4_update_overhead(struct super_block *sb);
3020
3021 /* migrate.c */
3022 extern int ext4_ext_migrate(struct inode *);
3023 extern int ext4_ind_migrate(struct inode *inode);
3024
3025 /* namei.c */
3026 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3027 struct inode *inode);
3028 extern int ext4_dirblock_csum_verify(struct inode *inode,
3029 struct buffer_head *bh);
3030 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3031 __u32 start_minor_hash, __u32 *next_hash);
3032 extern int ext4_search_dir(struct buffer_head *bh,
3033 char *search_buf,
3034 int buf_size,
3035 struct inode *dir,
3036 struct ext4_filename *fname,
3037 unsigned int offset,
3038 struct ext4_dir_entry_2 **res_dir);
3039 extern int ext4_generic_delete_entry(struct inode *dir,
3040 struct ext4_dir_entry_2 *de_del,
3041 struct buffer_head *bh,
3042 void *entry_buf,
3043 int buf_size,
3044 int csum_size);
3045 extern bool ext4_empty_dir(struct inode *inode);
3046
3047 /* resize.c */
3048 extern void ext4_kvfree_array_rcu(void *to_free);
3049 extern int ext4_group_add(struct super_block *sb,
3050 struct ext4_new_group_data *input);
3051 extern int ext4_group_extend(struct super_block *sb,
3052 struct ext4_super_block *es,
3053 ext4_fsblk_t n_blocks_count);
3054 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3055 extern unsigned int ext4_list_backups(struct super_block *sb,
3056 unsigned int *three, unsigned int *five,
3057 unsigned int *seven);
3058
3059 /* super.c */
3060 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3061 sector_t block, int op_flags);
3062 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3063 sector_t block);
3064 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3065 bh_end_io_t *end_io);
3066 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3067 bh_end_io_t *end_io);
3068 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3069 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3070 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3071 extern int ext4_calculate_overhead(struct super_block *sb);
3072 extern __le32 ext4_superblock_csum(struct super_block *sb,
3073 struct ext4_super_block *es);
3074 extern void ext4_superblock_csum_set(struct super_block *sb);
3075 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3076 ext4_group_t ngroup);
3077 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3078 char nbuf[16]);
3079 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3080 ext4_group_t block_group,
3081 unsigned int flags);
3082
3083 extern __printf(7, 8)
3084 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3085 int, __u64, const char *, ...);
3086 extern __printf(6, 7)
3087 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3088 ext4_fsblk_t, int, const char *, ...);
3089 extern __printf(5, 6)
3090 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3091 const char *, ...);
3092 extern void __ext4_std_error(struct super_block *, const char *,
3093 unsigned int, int);
3094 extern __printf(4, 5)
3095 void __ext4_warning(struct super_block *, const char *, unsigned int,
3096 const char *, ...);
3097 extern __printf(4, 5)
3098 void __ext4_warning_inode(const struct inode *inode, const char *function,
3099 unsigned int line, const char *fmt, ...);
3100 extern __printf(3, 4)
3101 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3102 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3103 const char *, unsigned int, const char *);
3104 extern __printf(7, 8)
3105 void __ext4_grp_locked_error(const char *, unsigned int,
3106 struct super_block *, ext4_group_t,
3107 unsigned long, ext4_fsblk_t,
3108 const char *, ...);
3109
3110 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3111 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3112
3113 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3114 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3115
3116 #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3117 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3118 (fmt), ## a)
3119
3120 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3121 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3122
3123 #define ext4_abort(sb, err, fmt, a...) \
3124 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3125
3126 #ifdef CONFIG_PRINTK
3127
3128 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3129 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3130 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3131 __ext4_error_inode((inode), (func), (line), (block), \
3132 (err), (fmt), ##__VA_ARGS__)
3133 #define ext4_error_file(file, func, line, block, fmt, ...) \
3134 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3135 #define ext4_error(sb, fmt, ...) \
3136 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3137 ##__VA_ARGS__)
3138 #define ext4_error_err(sb, err, fmt, ...) \
3139 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3140 ##__VA_ARGS__)
3141 #define ext4_warning(sb, fmt, ...) \
3142 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3143 #define ext4_warning_inode(inode, fmt, ...) \
3144 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3145 #define ext4_msg(sb, level, fmt, ...) \
3146 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3147 #define dump_mmp_msg(sb, mmp, msg) \
3148 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3149 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3150 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3151 fmt, ##__VA_ARGS__)
3152
3153 #else
3154
3155 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3156 do { \
3157 no_printk(fmt, ##__VA_ARGS__); \
3158 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3159 } while (0)
3160 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3161 do { \
3162 no_printk(fmt, ##__VA_ARGS__); \
3163 __ext4_error_inode(inode, "", 0, block, err, " "); \
3164 } while (0)
3165 #define ext4_error_file(file, func, line, block, fmt, ...) \
3166 do { \
3167 no_printk(fmt, ##__VA_ARGS__); \
3168 __ext4_error_file(file, "", 0, block, " "); \
3169 } while (0)
3170 #define ext4_error(sb, fmt, ...) \
3171 do { \
3172 no_printk(fmt, ##__VA_ARGS__); \
3173 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3174 } while (0)
3175 #define ext4_error_err(sb, err, fmt, ...) \
3176 do { \
3177 no_printk(fmt, ##__VA_ARGS__); \
3178 __ext4_error(sb, "", 0, false, err, 0, " "); \
3179 } while (0)
3180 #define ext4_warning(sb, fmt, ...) \
3181 do { \
3182 no_printk(fmt, ##__VA_ARGS__); \
3183 __ext4_warning(sb, "", 0, " "); \
3184 } while (0)
3185 #define ext4_warning_inode(inode, fmt, ...) \
3186 do { \
3187 no_printk(fmt, ##__VA_ARGS__); \
3188 __ext4_warning_inode(inode, "", 0, " "); \
3189 } while (0)
3190 #define ext4_msg(sb, level, fmt, ...) \
3191 do { \
3192 no_printk(fmt, ##__VA_ARGS__); \
3193 __ext4_msg(sb, "", " "); \
3194 } while (0)
3195 #define dump_mmp_msg(sb, mmp, msg) \
3196 __dump_mmp_msg(sb, mmp, "", 0, "")
3197 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3198 do { \
3199 no_printk(fmt, ##__VA_ARGS__); \
3200 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3201 } while (0)
3202
3203 #endif
3204
3205 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3206 struct ext4_group_desc *bg);
3207 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3208 struct ext4_group_desc *bg);
3209 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3210 struct ext4_group_desc *bg);
3211 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3212 struct ext4_group_desc *bg);
3213 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3214 struct ext4_group_desc *bg);
3215 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3216 struct ext4_group_desc *bg);
3217 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3218 struct ext4_group_desc *bg);
3219 extern void ext4_block_bitmap_set(struct super_block *sb,
3220 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3221 extern void ext4_inode_bitmap_set(struct super_block *sb,
3222 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3223 extern void ext4_inode_table_set(struct super_block *sb,
3224 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3225 extern void ext4_free_group_clusters_set(struct super_block *sb,
3226 struct ext4_group_desc *bg,
3227 __u32 count);
3228 extern void ext4_free_inodes_set(struct super_block *sb,
3229 struct ext4_group_desc *bg, __u32 count);
3230 extern void ext4_used_dirs_set(struct super_block *sb,
3231 struct ext4_group_desc *bg, __u32 count);
3232 extern void ext4_itable_unused_set(struct super_block *sb,
3233 struct ext4_group_desc *bg, __u32 count);
3234 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3235 struct ext4_group_desc *gdp);
3236 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3237 struct ext4_group_desc *gdp);
3238 extern int ext4_register_li_request(struct super_block *sb,
3239 ext4_group_t first_not_zeroed);
3240
ext4_has_metadata_csum(struct super_block * sb)3241 static inline int ext4_has_metadata_csum(struct super_block *sb)
3242 {
3243 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3244 !EXT4_SB(sb)->s_chksum_driver);
3245
3246 return ext4_has_feature_metadata_csum(sb) &&
3247 (EXT4_SB(sb)->s_chksum_driver != NULL);
3248 }
3249
ext4_has_group_desc_csum(struct super_block * sb)3250 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3251 {
3252 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3253 }
3254
3255 #define ext4_read_incompat_64bit_val(es, name) \
3256 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3257 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3258 le32_to_cpu(es->name##_lo))
3259
ext4_blocks_count(struct ext4_super_block * es)3260 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3261 {
3262 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3263 }
3264
ext4_r_blocks_count(struct ext4_super_block * es)3265 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3266 {
3267 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3268 }
3269
ext4_free_blocks_count(struct ext4_super_block * es)3270 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3271 {
3272 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3273 }
3274
ext4_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3275 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3276 ext4_fsblk_t blk)
3277 {
3278 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3279 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3280 }
3281
ext4_free_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3282 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3283 ext4_fsblk_t blk)
3284 {
3285 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3286 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3287 }
3288
ext4_r_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3289 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3290 ext4_fsblk_t blk)
3291 {
3292 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3293 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3294 }
3295
ext4_isize(struct super_block * sb,struct ext4_inode * raw_inode)3296 static inline loff_t ext4_isize(struct super_block *sb,
3297 struct ext4_inode *raw_inode)
3298 {
3299 if (ext4_has_feature_largedir(sb) ||
3300 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3301 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3302 le32_to_cpu(raw_inode->i_size_lo);
3303
3304 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3305 }
3306
ext4_isize_set(struct ext4_inode * raw_inode,loff_t i_size)3307 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3308 {
3309 raw_inode->i_size_lo = cpu_to_le32(i_size);
3310 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3311 }
3312
3313 static inline
ext4_get_group_info(struct super_block * sb,ext4_group_t group)3314 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3315 ext4_group_t group)
3316 {
3317 struct ext4_group_info **grp_info;
3318 long indexv, indexh;
3319 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3320 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3321 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3322 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3323 return grp_info[indexh];
3324 }
3325
3326 /*
3327 * Reading s_groups_count requires using smp_rmb() afterwards. See
3328 * the locking protocol documented in the comments of ext4_group_add()
3329 * in resize.c
3330 */
ext4_get_groups_count(struct super_block * sb)3331 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3332 {
3333 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3334
3335 smp_rmb();
3336 return ngroups;
3337 }
3338
ext4_flex_group(struct ext4_sb_info * sbi,ext4_group_t block_group)3339 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3340 ext4_group_t block_group)
3341 {
3342 return block_group >> sbi->s_log_groups_per_flex;
3343 }
3344
ext4_flex_bg_size(struct ext4_sb_info * sbi)3345 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3346 {
3347 return 1 << sbi->s_log_groups_per_flex;
3348 }
3349
3350 #define ext4_std_error(sb, errno) \
3351 do { \
3352 if ((errno)) \
3353 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3354 } while (0)
3355
3356 #ifdef CONFIG_SMP
3357 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3358 * counters. So we need to make sure we have free clusters more
3359 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3360 */
3361 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3362 #else
3363 #define EXT4_FREECLUSTERS_WATERMARK 0
3364 #endif
3365
3366 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_i_disksize(struct inode * inode,loff_t newsize)3367 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3368 {
3369 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3370 !inode_is_locked(inode));
3371 down_write(&EXT4_I(inode)->i_data_sem);
3372 if (newsize > EXT4_I(inode)->i_disksize)
3373 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3374 up_write(&EXT4_I(inode)->i_data_sem);
3375 }
3376
3377 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
ext4_update_inode_size(struct inode * inode,loff_t newsize)3378 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3379 {
3380 int changed = 0;
3381
3382 if (newsize > inode->i_size) {
3383 i_size_write(inode, newsize);
3384 changed = 1;
3385 }
3386 if (newsize > EXT4_I(inode)->i_disksize) {
3387 ext4_update_i_disksize(inode, newsize);
3388 changed |= 2;
3389 }
3390 return changed;
3391 }
3392
3393 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3394 loff_t len);
3395
3396 struct ext4_group_info {
3397 unsigned long bb_state;
3398 #ifdef AGGRESSIVE_CHECK
3399 unsigned long bb_check_counter;
3400 #endif
3401 struct rb_root bb_free_root;
3402 ext4_grpblk_t bb_first_free; /* first free block */
3403 ext4_grpblk_t bb_free; /* total free blocks */
3404 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3405 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3406 ext4_group_t bb_group; /* Group number */
3407 struct list_head bb_prealloc_list;
3408 #ifdef DOUBLE_CHECK
3409 void *bb_bitmap;
3410 #endif
3411 struct rw_semaphore alloc_sem;
3412 struct rb_node bb_avg_fragment_size_rb;
3413 struct list_head bb_largest_free_order_node;
3414 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3415 * regions, index is order.
3416 * bb_counters[3] = 5 means
3417 * 5 free 8-block regions. */
3418 };
3419
3420 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3421 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3422 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3423 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3424 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3425 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3426 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3427 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3428 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3429
3430 #define EXT4_MB_GRP_NEED_INIT(grp) \
3431 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3432 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3433 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3434 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3435 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3436
3437 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3438 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3439 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3440 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3441 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3442 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3443 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3444 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3445
3446 #define EXT4_MAX_CONTENTION 8
3447 #define EXT4_CONTENTION_THRESHOLD 2
3448
ext4_group_lock_ptr(struct super_block * sb,ext4_group_t group)3449 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3450 ext4_group_t group)
3451 {
3452 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3453 }
3454
3455 /*
3456 * Returns true if the filesystem is busy enough that attempts to
3457 * access the block group locks has run into contention.
3458 */
ext4_fs_is_busy(struct ext4_sb_info * sbi)3459 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3460 {
3461 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3462 }
3463
ext4_lock_group(struct super_block * sb,ext4_group_t group)3464 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3465 {
3466 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3467 if (spin_trylock(lock))
3468 /*
3469 * We're able to grab the lock right away, so drop the
3470 * lock contention counter.
3471 */
3472 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3473 else {
3474 /*
3475 * The lock is busy, so bump the contention counter,
3476 * and then wait on the spin lock.
3477 */
3478 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3479 EXT4_MAX_CONTENTION);
3480 spin_lock(lock);
3481 }
3482 }
3483
ext4_unlock_group(struct super_block * sb,ext4_group_t group)3484 static inline void ext4_unlock_group(struct super_block *sb,
3485 ext4_group_t group)
3486 {
3487 spin_unlock(ext4_group_lock_ptr(sb, group));
3488 }
3489
3490 #ifdef CONFIG_QUOTA
ext4_quota_capable(struct super_block * sb)3491 static inline bool ext4_quota_capable(struct super_block *sb)
3492 {
3493 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3494 }
3495
ext4_is_quota_journalled(struct super_block * sb)3496 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3497 {
3498 struct ext4_sb_info *sbi = EXT4_SB(sb);
3499
3500 return (ext4_has_feature_quota(sb) ||
3501 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3502 }
3503 int ext4_enable_quotas(struct super_block *sb);
3504 #endif
3505
3506 /*
3507 * Block validity checking
3508 */
3509 #define ext4_check_indirect_blockref(inode, bh) \
3510 ext4_check_blockref(__func__, __LINE__, inode, \
3511 (__le32 *)(bh)->b_data, \
3512 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3513
3514 #define ext4_ind_check_inode(inode) \
3515 ext4_check_blockref(__func__, __LINE__, inode, \
3516 EXT4_I(inode)->i_data, \
3517 EXT4_NDIR_BLOCKS)
3518
3519 /*
3520 * Inodes and files operations
3521 */
3522
3523 /* dir.c */
3524 extern const struct file_operations ext4_dir_operations;
3525
3526 /* file.c */
3527 extern const struct inode_operations ext4_file_inode_operations;
3528 extern const struct file_operations ext4_file_operations;
3529 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3530
3531 /* inline.c */
3532 extern int ext4_get_max_inline_size(struct inode *inode);
3533 extern int ext4_find_inline_data_nolock(struct inode *inode);
3534 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3535 unsigned int len);
3536 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3537
3538 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3539 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3540 struct inode *inode,
3541 loff_t pos, unsigned len,
3542 struct page **pagep);
3543 extern int ext4_write_inline_data_end(struct inode *inode,
3544 loff_t pos, unsigned len,
3545 unsigned copied,
3546 struct page *page);
3547 extern struct buffer_head *
3548 ext4_journalled_write_inline_data(struct inode *inode,
3549 unsigned len,
3550 struct page *page);
3551 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3552 struct inode *inode,
3553 loff_t pos, unsigned len,
3554 struct page **pagep,
3555 void **fsdata);
3556 extern int ext4_try_add_inline_entry(handle_t *handle,
3557 struct ext4_filename *fname,
3558 struct inode *dir, struct inode *inode);
3559 extern int ext4_try_create_inline_dir(handle_t *handle,
3560 struct inode *parent,
3561 struct inode *inode);
3562 extern int ext4_read_inline_dir(struct file *filp,
3563 struct dir_context *ctx,
3564 int *has_inline_data);
3565 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3566 struct inode *dir, ext4_lblk_t block,
3567 struct dx_hash_info *hinfo,
3568 __u32 start_hash, __u32 start_minor_hash,
3569 int *has_inline_data);
3570 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3571 struct ext4_filename *fname,
3572 struct ext4_dir_entry_2 **res_dir,
3573 int *has_inline_data);
3574 extern int ext4_delete_inline_entry(handle_t *handle,
3575 struct inode *dir,
3576 struct ext4_dir_entry_2 *de_del,
3577 struct buffer_head *bh,
3578 int *has_inline_data);
3579 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3580 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3581 struct ext4_dir_entry_2 **parent_de,
3582 int *retval);
3583 extern int ext4_inline_data_fiemap(struct inode *inode,
3584 struct fiemap_extent_info *fieinfo,
3585 int *has_inline, __u64 start, __u64 len);
3586 extern void *ext4_read_inline_link(struct inode *inode);
3587
3588 struct iomap;
3589 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3590
3591 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3592
3593 extern int ext4_convert_inline_data(struct inode *inode);
3594
ext4_has_inline_data(struct inode * inode)3595 static inline int ext4_has_inline_data(struct inode *inode)
3596 {
3597 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3598 EXT4_I(inode)->i_inline_off;
3599 }
3600
3601 /* namei.c */
3602 extern const struct inode_operations ext4_dir_inode_operations;
3603 extern const struct inode_operations ext4_special_inode_operations;
3604 extern struct dentry *ext4_get_parent(struct dentry *child);
3605 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3606 struct ext4_dir_entry_2 *de,
3607 int blocksize, int csum_size,
3608 unsigned int parent_ino, int dotdot_real_len);
3609 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3610 unsigned int blocksize);
3611 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3612 struct buffer_head *bh);
3613 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3614 struct inode *inode);
3615 extern int __ext4_link(struct inode *dir, struct inode *inode,
3616 struct dentry *dentry);
3617
3618 #define S_SHIFT 12
3619 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3620 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3621 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3622 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3623 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3624 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3625 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3626 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3627 };
3628
ext4_set_de_type(struct super_block * sb,struct ext4_dir_entry_2 * de,umode_t mode)3629 static inline void ext4_set_de_type(struct super_block *sb,
3630 struct ext4_dir_entry_2 *de,
3631 umode_t mode) {
3632 if (ext4_has_feature_filetype(sb))
3633 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3634 }
3635
3636 /* readpages.c */
3637 extern int ext4_mpage_readpages(struct inode *inode,
3638 struct readahead_control *rac, struct page *page);
3639 extern int __init ext4_init_post_read_processing(void);
3640 extern void ext4_exit_post_read_processing(void);
3641
3642 /* symlink.c */
3643 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3644 extern const struct inode_operations ext4_symlink_inode_operations;
3645 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3646
3647 /* sysfs.c */
3648 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3649 extern int ext4_register_sysfs(struct super_block *sb);
3650 extern void ext4_unregister_sysfs(struct super_block *sb);
3651 extern int __init ext4_init_sysfs(void);
3652 extern void ext4_exit_sysfs(void);
3653
3654 /* block_validity */
3655 extern void ext4_release_system_zone(struct super_block *sb);
3656 extern int ext4_setup_system_zone(struct super_block *sb);
3657 extern int __init ext4_init_system_zone(void);
3658 extern void ext4_exit_system_zone(void);
3659 extern int ext4_inode_block_valid(struct inode *inode,
3660 ext4_fsblk_t start_blk,
3661 unsigned int count);
3662 extern int ext4_check_blockref(const char *, unsigned int,
3663 struct inode *, __le32 *, unsigned int);
3664 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3665 ext4_fsblk_t start_blk, unsigned int count);
3666
3667
3668 /* extents.c */
3669 struct ext4_ext_path;
3670 struct ext4_extent;
3671
3672 /*
3673 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3674 * __le32.
3675 */
3676 #define EXT_MAX_BLOCKS 0xffffffff
3677
3678 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3679 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3680 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3681 struct ext4_map_blocks *map, int flags);
3682 extern int ext4_ext_truncate(handle_t *, struct inode *);
3683 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3684 ext4_lblk_t end);
3685 extern void ext4_ext_init(struct super_block *);
3686 extern void ext4_ext_release(struct super_block *);
3687 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3688 loff_t len);
3689 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3690 loff_t offset, ssize_t len);
3691 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3692 ext4_io_end_t *io_end);
3693 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3694 struct ext4_map_blocks *map, int flags);
3695 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3696 int num,
3697 struct ext4_ext_path *path);
3698 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3699 struct ext4_ext_path **,
3700 struct ext4_extent *, int);
3701 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3702 struct ext4_ext_path **,
3703 int flags);
3704 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3705 extern int ext4_ext_check_inode(struct inode *inode);
3706 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3707 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3708 __u64 start, __u64 len);
3709 extern int ext4_get_es_cache(struct inode *inode,
3710 struct fiemap_extent_info *fieinfo,
3711 __u64 start, __u64 len);
3712 extern int ext4_ext_precache(struct inode *inode);
3713 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3714 struct inode *inode2, ext4_lblk_t lblk1,
3715 ext4_lblk_t lblk2, ext4_lblk_t count,
3716 int mark_unwritten,int *err);
3717 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3718 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3719 int check_cred, int restart_cred,
3720 int revoke_cred);
3721 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3722 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3723 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3724 int len, int unwritten, ext4_fsblk_t pblk);
3725 extern int ext4_ext_clear_bb(struct inode *inode);
3726
3727
3728 /* move_extent.c */
3729 extern void ext4_double_down_write_data_sem(struct inode *first,
3730 struct inode *second);
3731 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3732 struct inode *donor_inode);
3733 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3734 __u64 start_orig, __u64 start_donor,
3735 __u64 len, __u64 *moved_len);
3736
3737 /* page-io.c */
3738 extern int __init ext4_init_pageio(void);
3739 extern void ext4_exit_pageio(void);
3740 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3741 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3742 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3743 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3744 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3745 struct writeback_control *wbc);
3746 extern void ext4_end_io_rsv_work(struct work_struct *work);
3747 extern void ext4_io_submit(struct ext4_io_submit *io);
3748 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3749 struct page *page,
3750 int len,
3751 bool keep_towrite);
3752 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3753 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3754
3755 /* mmp.c */
3756 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3757
3758 /* mmp.c */
3759 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3760
3761 /* verity.c */
3762 extern const struct fsverity_operations ext4_verityops;
3763
3764 /* orphan.c */
3765 extern int ext4_orphan_add(handle_t *, struct inode *);
3766 extern int ext4_orphan_del(handle_t *, struct inode *);
3767 extern void ext4_orphan_cleanup(struct super_block *sb,
3768 struct ext4_super_block *es);
3769 extern void ext4_release_orphan_info(struct super_block *sb);
3770 extern int ext4_init_orphan_info(struct super_block *sb);
3771 extern int ext4_orphan_file_empty(struct super_block *sb);
3772 extern void ext4_orphan_file_block_trigger(
3773 struct jbd2_buffer_trigger_type *triggers,
3774 struct buffer_head *bh,
3775 void *data, size_t size);
3776
3777 /*
3778 * Add new method to test whether block and inode bitmaps are properly
3779 * initialized. With uninit_bg reading the block from disk is not enough
3780 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3781 */
3782 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3783
bitmap_uptodate(struct buffer_head * bh)3784 static inline int bitmap_uptodate(struct buffer_head *bh)
3785 {
3786 return (buffer_uptodate(bh) &&
3787 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3788 }
set_bitmap_uptodate(struct buffer_head * bh)3789 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3790 {
3791 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3792 }
3793
3794 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3795
3796 /* For ioend & aio unwritten conversion wait queues */
3797 #define EXT4_WQ_HASH_SZ 37
3798 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3799 EXT4_WQ_HASH_SZ])
3800 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3801
3802 extern int ext4_resize_begin(struct super_block *sb);
3803 extern void ext4_resize_end(struct super_block *sb);
3804
ext4_set_io_unwritten_flag(struct inode * inode,struct ext4_io_end * io_end)3805 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3806 struct ext4_io_end *io_end)
3807 {
3808 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3809 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3810 atomic_inc(&EXT4_I(inode)->i_unwritten);
3811 }
3812 }
3813
ext4_clear_io_unwritten_flag(ext4_io_end_t * io_end)3814 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3815 {
3816 struct inode *inode = io_end->inode;
3817
3818 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3819 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3820 /* Wake up anyone waiting on unwritten extent conversion */
3821 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3822 wake_up_all(ext4_ioend_wq(inode));
3823 }
3824 }
3825
3826 extern const struct iomap_ops ext4_iomap_ops;
3827 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3828 extern const struct iomap_ops ext4_iomap_report_ops;
3829
ext4_buffer_uptodate(struct buffer_head * bh)3830 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3831 {
3832 /*
3833 * If the buffer has the write error flag, we have failed
3834 * to write out data in the block. In this case, we don't
3835 * have to read the block because we may read the old data
3836 * successfully.
3837 */
3838 if (buffer_write_io_error(bh))
3839 set_buffer_uptodate(bh);
3840 return buffer_uptodate(bh);
3841 }
3842
3843 #endif /* __KERNEL__ */
3844
3845 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3846 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3847
3848 #endif /* _EXT4_H */
3849