1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ext4.h
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/include/linux/minix_fs.h
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 */
16
17 #ifndef _EXT4_H
18 #define _EXT4_H
19
20 #include <linux/types.h>
21 #include <linux/blkdev.h>
22 #include <linux/magic.h>
23 #include <linux/jbd2.h>
24 #include <linux/quota.h>
25 #include <linux/rwsem.h>
26 #include <linux/rbtree.h>
27 #include <linux/seqlock.h>
28 #include <linux/mutex.h>
29 #include <linux/timer.h>
30 #include <linux/wait.h>
31 #include <linux/sched/signal.h>
32 #include <linux/blockgroup_lock.h>
33 #include <linux/percpu_counter.h>
34 #include <linux/ratelimit.h>
35 #include <crypto/hash.h>
36 #include <linux/falloc.h>
37 #include <linux/percpu-rwsem.h>
38 #include <linux/fiemap.h>
39 #ifdef __KERNEL__
40 #include <linux/compat.h>
41 #endif
42
43 #include <linux/fscrypt.h>
44 #include <linux/fsverity.h>
45
46 #include <linux/compiler.h>
47
48 /*
49 * The fourth extended filesystem constants/structures
50 */
51
52 /*
53 * with AGGRESSIVE_CHECK allocator runs consistency checks over
54 * structures. these checks slow things down a lot
55 */
56 #define AGGRESSIVE_CHECK__
57
58 /*
59 * with DOUBLE_CHECK defined mballoc creates persistent in-core
60 * bitmaps, maintains and uses them to check for double allocations
61 */
62 #define DOUBLE_CHECK__
63
64 /*
65 * Define EXT4FS_DEBUG to produce debug messages
66 */
67 #undef EXT4FS_DEBUG
68
69 /*
70 * Debug code
71 */
72 #ifdef EXT4FS_DEBUG
73 #define ext4_debug(f, a...) \
74 do { \
75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
76 __FILE__, __LINE__, __func__); \
77 printk(KERN_DEBUG f, ## a); \
78 } while (0)
79 #else
80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
81 #endif
82
83 /*
84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
85 */
86 #define EXT_DEBUG__
87
88 /*
89 * Dynamic printk for controlled extents debugging.
90 */
91 #ifdef CONFIG_EXT4_DEBUG
92 #define ext_debug(ino, fmt, ...) \
93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
94 current->comm, task_pid_nr(current), \
95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
96 __func__, ##__VA_ARGS__)
97 #else
98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
99 #endif
100
101 /* data type for block offset of block group */
102 typedef int ext4_grpblk_t;
103
104 /* data type for filesystem-wide blocks number */
105 typedef unsigned long long ext4_fsblk_t;
106
107 /* data type for file logical block number */
108 typedef __u32 ext4_lblk_t;
109
110 /* data type for block group number */
111 typedef unsigned int ext4_group_t;
112
113 enum SHIFT_DIRECTION {
114 SHIFT_LEFT = 0,
115 SHIFT_RIGHT,
116 };
117
118 /*
119 * Flags used in mballoc's allocation_context flags field.
120 *
121 * Also used to show what's going on for debugging purposes when the
122 * flag field is exported via the traceport interface
123 */
124
125 /* prefer goal again. length */
126 #define EXT4_MB_HINT_MERGE 0x0001
127 /* blocks already reserved */
128 #define EXT4_MB_HINT_RESERVED 0x0002
129 /* metadata is being allocated */
130 #define EXT4_MB_HINT_METADATA 0x0004
131 /* first blocks in the file */
132 #define EXT4_MB_HINT_FIRST 0x0008
133 /* search for the best chunk */
134 #define EXT4_MB_HINT_BEST 0x0010
135 /* data is being allocated */
136 #define EXT4_MB_HINT_DATA 0x0020
137 /* don't preallocate (for tails) */
138 #define EXT4_MB_HINT_NOPREALLOC 0x0040
139 /* allocate for locality group */
140 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
141 /* allocate goal blocks or none */
142 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
143 /* goal is meaningful */
144 #define EXT4_MB_HINT_TRY_GOAL 0x0200
145 /* blocks already pre-reserved by delayed allocation */
146 #define EXT4_MB_DELALLOC_RESERVED 0x0400
147 /* We are doing stream allocation */
148 #define EXT4_MB_STREAM_ALLOC 0x0800
149 /* Use reserved root blocks if needed */
150 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
151 /* Use blocks from reserved pool */
152 #define EXT4_MB_USE_RESERVED 0x2000
153 /* Do strict check for free blocks while retrying block allocation */
154 #define EXT4_MB_STRICT_CHECK 0x4000
155
156 struct ext4_allocation_request {
157 /* target inode for block we're allocating */
158 struct inode *inode;
159 /* how many blocks we want to allocate */
160 unsigned int len;
161 /* logical block in target inode */
162 ext4_lblk_t logical;
163 /* the closest logical allocated block to the left */
164 ext4_lblk_t lleft;
165 /* the closest logical allocated block to the right */
166 ext4_lblk_t lright;
167 /* phys. target (a hint) */
168 ext4_fsblk_t goal;
169 /* phys. block for the closest logical allocated block to the left */
170 ext4_fsblk_t pleft;
171 /* phys. block for the closest logical allocated block to the right */
172 ext4_fsblk_t pright;
173 /* flags. see above EXT4_MB_HINT_* */
174 unsigned int flags;
175 };
176
177 /*
178 * Logical to physical block mapping, used by ext4_map_blocks()
179 *
180 * This structure is used to pass requests into ext4_map_blocks() as
181 * well as to store the information returned by ext4_map_blocks(). It
182 * takes less room on the stack than a struct buffer_head.
183 */
184 #define EXT4_MAP_NEW BIT(BH_New)
185 #define EXT4_MAP_MAPPED BIT(BH_Mapped)
186 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
187 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
188 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
189 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
190
191 struct ext4_map_blocks {
192 ext4_fsblk_t m_pblk;
193 ext4_lblk_t m_lblk;
194 unsigned int m_len;
195 unsigned int m_flags;
196 };
197
198 /*
199 * Block validity checking, system zone rbtree.
200 */
201 struct ext4_system_blocks {
202 struct rb_root root;
203 struct rcu_head rcu;
204 };
205
206 /*
207 * Flags for ext4_io_end->flags
208 */
209 #define EXT4_IO_END_UNWRITTEN 0x0001
210
211 struct ext4_io_end_vec {
212 struct list_head list; /* list of io_end_vec */
213 loff_t offset; /* offset in the file */
214 ssize_t size; /* size of the extent */
215 };
216
217 /*
218 * For converting unwritten extents on a work queue. 'handle' is used for
219 * buffered writeback.
220 */
221 typedef struct ext4_io_end {
222 struct list_head list; /* per-file finished IO list */
223 handle_t *handle; /* handle reserved for extent
224 * conversion */
225 struct inode *inode; /* file being written to */
226 struct bio *bio; /* Linked list of completed
227 * bios covering the extent */
228 unsigned int flag; /* unwritten or not */
229 atomic_t count; /* reference counter */
230 struct list_head list_vec; /* list of ext4_io_end_vec */
231 } ext4_io_end_t;
232
233 struct ext4_io_submit {
234 struct writeback_control *io_wbc;
235 struct bio *io_bio;
236 ext4_io_end_t *io_end;
237 sector_t io_next_block;
238 };
239
240 /*
241 * Special inodes numbers
242 */
243 #define EXT4_BAD_INO 1 /* Bad blocks inode */
244 #define EXT4_ROOT_INO 2 /* Root inode */
245 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
246 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
247 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
248 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
249 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
250 #define EXT4_JOURNAL_INO 8 /* Journal inode */
251
252 /* First non-reserved inode for old ext4 filesystems */
253 #define EXT4_GOOD_OLD_FIRST_INO 11
254
255 /*
256 * Maximal count of links to a file
257 */
258 #define EXT4_LINK_MAX 65000
259
260 /*
261 * Macro-instructions used to manage several block sizes
262 */
263 #define EXT4_MIN_BLOCK_SIZE 1024
264 #define EXT4_MAX_BLOCK_SIZE 65536
265 #define EXT4_MIN_BLOCK_LOG_SIZE 10
266 #define EXT4_MAX_BLOCK_LOG_SIZE 16
267 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
268 #ifdef __KERNEL__
269 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
270 #else
271 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
272 #endif
273 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
274 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
275 EXT4_SB(s)->s_cluster_bits)
276 #ifdef __KERNEL__
277 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
278 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
279 #else
280 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
281 #endif
282 #ifdef __KERNEL__
283 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
284 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
285 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
286 #else
287 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
288 EXT4_GOOD_OLD_INODE_SIZE : \
289 (s)->s_inode_size)
290 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
291 EXT4_GOOD_OLD_FIRST_INO : \
292 (s)->s_first_ino)
293 #endif
294 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
295 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
296 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
297 blkbits))
298
299 /* Translate a block number to a cluster number */
300 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
301 /* Translate a cluster number to a block number */
302 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
303 /* Translate # of blks to # of clusters */
304 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
305 (sbi)->s_cluster_bits)
306 /* Mask out the low bits to get the starting block of the cluster */
307 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
308 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
309 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
310 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
311 /* Fill in the low bits to get the last block of the cluster */
312 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
313 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
314 /* Get the cluster offset */
315 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
316 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
317 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
318 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
319
320 /*
321 * Structure of a blocks group descriptor
322 */
323 struct ext4_group_desc
324 {
325 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
326 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
327 __le32 bg_inode_table_lo; /* Inodes table block */
328 __le16 bg_free_blocks_count_lo;/* Free blocks count */
329 __le16 bg_free_inodes_count_lo;/* Free inodes count */
330 __le16 bg_used_dirs_count_lo; /* Directories count */
331 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
332 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
333 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
334 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
335 __le16 bg_itable_unused_lo; /* Unused inodes count */
336 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
337 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
338 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
339 __le32 bg_inode_table_hi; /* Inodes table block MSB */
340 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
341 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
342 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
343 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
344 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
345 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
346 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
347 __u32 bg_reserved;
348 };
349
350 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
351 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
352 sizeof(__le16))
353 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
354 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
355 sizeof(__le16))
356
357 /*
358 * Structure of a flex block group info
359 */
360
361 struct flex_groups {
362 atomic64_t free_clusters;
363 atomic_t free_inodes;
364 atomic_t used_dirs;
365 };
366
367 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
368 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
369 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
370
371 /*
372 * Macro-instructions used to manage group descriptors
373 */
374 #define EXT4_MIN_DESC_SIZE 32
375 #define EXT4_MIN_DESC_SIZE_64BIT 64
376 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
377 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
378 #ifdef __KERNEL__
379 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
380 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
381 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
382 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
383 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
384 #else
385 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
386 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
387 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
388 #endif
389
390 /*
391 * Constants relative to the data blocks
392 */
393 #define EXT4_NDIR_BLOCKS 12
394 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
395 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
396 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
397 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
398
399 /*
400 * Inode flags
401 */
402 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
403 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
404 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
405 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
406 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
407 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
408 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
409 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
410 /* Reserved for compression usage... */
411 #define EXT4_DIRTY_FL 0x00000100
412 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
413 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
414 /* nb: was previously EXT2_ECOMPR_FL */
415 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
416 /* End compression flags --- maybe not all used */
417 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
418 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
419 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
420 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
421 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
422 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
423 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
424 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
425 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
426 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
427 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
428
429 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
430
431 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
432 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
433 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
434 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
435
436 /* User modifiable flags */
437 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
438 EXT4_UNRM_FL | \
439 EXT4_COMPR_FL | \
440 EXT4_SYNC_FL | \
441 EXT4_IMMUTABLE_FL | \
442 EXT4_APPEND_FL | \
443 EXT4_NODUMP_FL | \
444 EXT4_NOATIME_FL | \
445 EXT4_JOURNAL_DATA_FL | \
446 EXT4_NOTAIL_FL | \
447 EXT4_DIRSYNC_FL | \
448 EXT4_TOPDIR_FL | \
449 EXT4_EXTENTS_FL | \
450 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
451 EXT4_DAX_FL | \
452 EXT4_PROJINHERIT_FL | \
453 EXT4_CASEFOLD_FL)
454
455 /* User visible flags */
456 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
457 EXT4_DIRTY_FL | \
458 EXT4_COMPRBLK_FL | \
459 EXT4_NOCOMPR_FL | \
460 EXT4_ENCRYPT_FL | \
461 EXT4_INDEX_FL | \
462 EXT4_VERITY_FL | \
463 EXT4_INLINE_DATA_FL)
464
465 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */
466 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
467 EXT4_IMMUTABLE_FL | \
468 EXT4_APPEND_FL | \
469 EXT4_NODUMP_FL | \
470 EXT4_NOATIME_FL | \
471 EXT4_PROJINHERIT_FL | \
472 EXT4_DAX_FL)
473
474 /* Flags that should be inherited by new inodes from their parent. */
475 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
476 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
477 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
478 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
479 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
480 EXT4_DAX_FL)
481
482 /* Flags that are appropriate for regular files (all but dir-specific ones). */
483 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
484 EXT4_PROJINHERIT_FL))
485
486 /* Flags that are appropriate for non-directories/regular files. */
487 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
488
489 /* The only flags that should be swapped */
490 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
491
492 /* Flags which are mutually exclusive to DAX */
493 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
494 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
495
496 /* Mask out flags that are inappropriate for the given type of inode. */
ext4_mask_flags(umode_t mode,__u32 flags)497 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
498 {
499 if (S_ISDIR(mode))
500 return flags;
501 else if (S_ISREG(mode))
502 return flags & EXT4_REG_FLMASK;
503 else
504 return flags & EXT4_OTHER_FLMASK;
505 }
506
507 /*
508 * Inode flags used for atomic set/get
509 */
510 enum {
511 EXT4_INODE_SECRM = 0, /* Secure deletion */
512 EXT4_INODE_UNRM = 1, /* Undelete */
513 EXT4_INODE_COMPR = 2, /* Compress file */
514 EXT4_INODE_SYNC = 3, /* Synchronous updates */
515 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
516 EXT4_INODE_APPEND = 5, /* writes to file may only append */
517 EXT4_INODE_NODUMP = 6, /* do not dump file */
518 EXT4_INODE_NOATIME = 7, /* do not update atime */
519 /* Reserved for compression usage... */
520 EXT4_INODE_DIRTY = 8,
521 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
522 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
523 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
524 /* End compression flags --- maybe not all used */
525 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
526 EXT4_INODE_IMAGIC = 13, /* AFS directory */
527 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
528 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
529 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
530 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
531 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
532 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
533 EXT4_INODE_VERITY = 20, /* Verity protected inode */
534 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
535 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
536 EXT4_INODE_DAX = 25, /* Inode is DAX */
537 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
538 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
539 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
540 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
541 };
542
543 /*
544 * Since it's pretty easy to mix up bit numbers and hex values, we use a
545 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
546 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
547 * any extra space in the compiled kernel image, otherwise, the build will fail.
548 * It's important that these values are the same, since we are using
549 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
550 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
551 * values found in ext2, ext3 and ext4 filesystems, and of course the values
552 * defined in e2fsprogs.
553 *
554 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
555 */
556 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
557 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
558
ext4_check_flag_values(void)559 static inline void ext4_check_flag_values(void)
560 {
561 CHECK_FLAG_VALUE(SECRM);
562 CHECK_FLAG_VALUE(UNRM);
563 CHECK_FLAG_VALUE(COMPR);
564 CHECK_FLAG_VALUE(SYNC);
565 CHECK_FLAG_VALUE(IMMUTABLE);
566 CHECK_FLAG_VALUE(APPEND);
567 CHECK_FLAG_VALUE(NODUMP);
568 CHECK_FLAG_VALUE(NOATIME);
569 CHECK_FLAG_VALUE(DIRTY);
570 CHECK_FLAG_VALUE(COMPRBLK);
571 CHECK_FLAG_VALUE(NOCOMPR);
572 CHECK_FLAG_VALUE(ENCRYPT);
573 CHECK_FLAG_VALUE(INDEX);
574 CHECK_FLAG_VALUE(IMAGIC);
575 CHECK_FLAG_VALUE(JOURNAL_DATA);
576 CHECK_FLAG_VALUE(NOTAIL);
577 CHECK_FLAG_VALUE(DIRSYNC);
578 CHECK_FLAG_VALUE(TOPDIR);
579 CHECK_FLAG_VALUE(HUGE_FILE);
580 CHECK_FLAG_VALUE(EXTENTS);
581 CHECK_FLAG_VALUE(VERITY);
582 CHECK_FLAG_VALUE(EA_INODE);
583 CHECK_FLAG_VALUE(INLINE_DATA);
584 CHECK_FLAG_VALUE(PROJINHERIT);
585 CHECK_FLAG_VALUE(CASEFOLD);
586 CHECK_FLAG_VALUE(RESERVED);
587 }
588
589 /* Used to pass group descriptor data when online resize is done */
590 struct ext4_new_group_input {
591 __u32 group; /* Group number for this data */
592 __u64 block_bitmap; /* Absolute block number of block bitmap */
593 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
594 __u64 inode_table; /* Absolute block number of inode table start */
595 __u32 blocks_count; /* Total number of blocks in this group */
596 __u16 reserved_blocks; /* Number of reserved blocks in this group */
597 __u16 unused;
598 };
599
600 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
601 struct compat_ext4_new_group_input {
602 u32 group;
603 compat_u64 block_bitmap;
604 compat_u64 inode_bitmap;
605 compat_u64 inode_table;
606 u32 blocks_count;
607 u16 reserved_blocks;
608 u16 unused;
609 };
610 #endif
611
612 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
613 struct ext4_new_group_data {
614 __u32 group;
615 __u64 block_bitmap;
616 __u64 inode_bitmap;
617 __u64 inode_table;
618 __u32 blocks_count;
619 __u16 reserved_blocks;
620 __u16 mdata_blocks;
621 __u32 free_clusters_count;
622 };
623
624 /* Indexes used to index group tables in ext4_new_group_data */
625 enum {
626 BLOCK_BITMAP = 0, /* block bitmap */
627 INODE_BITMAP, /* inode bitmap */
628 INODE_TABLE, /* inode tables */
629 GROUP_TABLE_COUNT,
630 };
631
632 /*
633 * Flags used by ext4_map_blocks()
634 */
635 /* Allocate any needed blocks and/or convert an unwritten
636 extent to be an initialized ext4 */
637 #define EXT4_GET_BLOCKS_CREATE 0x0001
638 /* Request the creation of an unwritten extent */
639 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
640 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
641 EXT4_GET_BLOCKS_CREATE)
642 /* Caller is from the delayed allocation writeout path
643 * finally doing the actual allocation of delayed blocks */
644 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
645 /* caller is from the direct IO path, request to creation of an
646 unwritten extents if not allocated, split the unwritten
647 extent if blocks has been preallocated already*/
648 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
649 #define EXT4_GET_BLOCKS_CONVERT 0x0010
650 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
651 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
652 /* Convert extent to initialized after IO complete */
653 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
654 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
655 /* Eventual metadata allocation (due to growing extent tree)
656 * should not fail, so try to use reserved blocks for that.*/
657 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
658 /* Don't normalize allocation size (used for fallocate) */
659 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
660 /* Convert written extents to unwritten */
661 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
662 /* Write zeros to newly created written extents */
663 #define EXT4_GET_BLOCKS_ZERO 0x0200
664 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
665 EXT4_GET_BLOCKS_ZERO)
666 /* Caller will submit data before dropping transaction handle. This
667 * allows jbd2 to avoid submitting data before commit. */
668 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
669
670 /*
671 * The bit position of these flags must not overlap with any of the
672 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
673 * read_extent_tree_block(), ext4_split_extent_at(),
674 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
675 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
676 * caching the extents when reading from the extent tree while a
677 * truncate or punch hole operation is in progress.
678 */
679 #define EXT4_EX_NOCACHE 0x40000000
680 #define EXT4_EX_FORCE_CACHE 0x20000000
681 #define EXT4_EX_NOFAIL 0x10000000
682
683 /*
684 * Flags used by ext4_free_blocks
685 */
686 #define EXT4_FREE_BLOCKS_METADATA 0x0001
687 #define EXT4_FREE_BLOCKS_FORGET 0x0002
688 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
689 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
690 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
691 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
692 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
693
694 /*
695 * ioctl commands
696 */
697 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
698 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
699 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
700 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
701 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
702 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
703 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
704 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
705 #define EXT4_IOC_MIGRATE _IO('f', 9)
706 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
707 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
708 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
709 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
710 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
711 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
712 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
713 /* ioctl codes 19--39 are reserved for fscrypt */
714 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
715 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
716 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
717
718 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
719
720 /*
721 * Flags for going down operation
722 */
723 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
724 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
725 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
726
727 /*
728 * Flags returned by EXT4_IOC_GETSTATE
729 *
730 * We only expose to userspace a subset of the state flags in
731 * i_state_flags
732 */
733 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
734 #define EXT4_STATE_FLAG_NEW 0x00000002
735 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004
736 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
737
738 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
739 /*
740 * ioctl commands in 32 bit emulation
741 */
742 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
743 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
744 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
745 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
746 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
747 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
748 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
749 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
750 #endif
751
752 /*
753 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
754 * It indicates that the entry in extent status cache is for a hole.
755 */
756 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
757
758 /* Max physical block we can address w/o extents */
759 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
760
761 /* Max logical block we can support */
762 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
763
764 /*
765 * Structure of an inode on the disk
766 */
767 struct ext4_inode {
768 __le16 i_mode; /* File mode */
769 __le16 i_uid; /* Low 16 bits of Owner Uid */
770 __le32 i_size_lo; /* Size in bytes */
771 __le32 i_atime; /* Access time */
772 __le32 i_ctime; /* Inode Change time */
773 __le32 i_mtime; /* Modification time */
774 __le32 i_dtime; /* Deletion Time */
775 __le16 i_gid; /* Low 16 bits of Group Id */
776 __le16 i_links_count; /* Links count */
777 __le32 i_blocks_lo; /* Blocks count */
778 __le32 i_flags; /* File flags */
779 union {
780 struct {
781 __le32 l_i_version;
782 } linux1;
783 struct {
784 __u32 h_i_translator;
785 } hurd1;
786 struct {
787 __u32 m_i_reserved1;
788 } masix1;
789 } osd1; /* OS dependent 1 */
790 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
791 __le32 i_generation; /* File version (for NFS) */
792 __le32 i_file_acl_lo; /* File ACL */
793 __le32 i_size_high;
794 __le32 i_obso_faddr; /* Obsoleted fragment address */
795 union {
796 struct {
797 __le16 l_i_blocks_high; /* were l_i_reserved1 */
798 __le16 l_i_file_acl_high;
799 __le16 l_i_uid_high; /* these 2 fields */
800 __le16 l_i_gid_high; /* were reserved2[0] */
801 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
802 __le16 l_i_reserved;
803 } linux2;
804 struct {
805 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
806 __u16 h_i_mode_high;
807 __u16 h_i_uid_high;
808 __u16 h_i_gid_high;
809 __u32 h_i_author;
810 } hurd2;
811 struct {
812 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
813 __le16 m_i_file_acl_high;
814 __u32 m_i_reserved2[2];
815 } masix2;
816 } osd2; /* OS dependent 2 */
817 __le16 i_extra_isize;
818 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
819 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
820 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
821 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
822 __le32 i_crtime; /* File Creation time */
823 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
824 __le32 i_version_hi; /* high 32 bits for 64-bit version */
825 __le32 i_projid; /* Project ID */
826 };
827
828 struct move_extent {
829 __u32 reserved; /* should be zero */
830 __u32 donor_fd; /* donor file descriptor */
831 __u64 orig_start; /* logical start offset in block for orig */
832 __u64 donor_start; /* logical start offset in block for donor */
833 __u64 len; /* block length to be moved */
834 __u64 moved_len; /* moved block length */
835 };
836
837 #define EXT4_EPOCH_BITS 2
838 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
839 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
840
841 /*
842 * Extended fields will fit into an inode if the filesystem was formatted
843 * with large inodes (-I 256 or larger) and there are not currently any EAs
844 * consuming all of the available space. For new inodes we always reserve
845 * enough space for the kernel's known extended fields, but for inodes
846 * created with an old kernel this might not have been the case. None of
847 * the extended inode fields is critical for correct filesystem operation.
848 * This macro checks if a certain field fits in the inode. Note that
849 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
850 */
851 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
852 ((offsetof(typeof(*ext4_inode), field) + \
853 sizeof((ext4_inode)->field)) \
854 <= (EXT4_GOOD_OLD_INODE_SIZE + \
855 (einode)->i_extra_isize)) \
856
857 /*
858 * We use an encoding that preserves the times for extra epoch "00":
859 *
860 * extra msb of adjust for signed
861 * epoch 32-bit 32-bit tv_sec to
862 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
863 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
864 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
865 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
866 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
867 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
868 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
869 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
870 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
871 *
872 * Note that previous versions of the kernel on 64-bit systems would
873 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
874 * 1970. e2fsck will correct this, assuming that it is run on the
875 * affected filesystem before 2242.
876 */
877
ext4_encode_extra_time(struct timespec64 * time)878 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
879 {
880 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
881 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
882 }
883
ext4_decode_extra_time(struct timespec64 * time,__le32 extra)884 static inline void ext4_decode_extra_time(struct timespec64 *time,
885 __le32 extra)
886 {
887 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
888 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
889 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
890 }
891
892 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
893 do { \
894 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
895 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
896 (raw_inode)->xtime ## _extra = \
897 ext4_encode_extra_time(&(inode)->xtime); \
898 } \
899 else \
900 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
901 } while (0)
902
903 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
904 do { \
905 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
906 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
907 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
908 (raw_inode)->xtime ## _extra = \
909 ext4_encode_extra_time(&(einode)->xtime); \
910 } while (0)
911
912 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
913 do { \
914 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
915 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
916 ext4_decode_extra_time(&(inode)->xtime, \
917 raw_inode->xtime ## _extra); \
918 } \
919 else \
920 (inode)->xtime.tv_nsec = 0; \
921 } while (0)
922
923
924 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
925 do { \
926 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
927 (einode)->xtime.tv_sec = \
928 (signed)le32_to_cpu((raw_inode)->xtime); \
929 else \
930 (einode)->xtime.tv_sec = 0; \
931 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
932 ext4_decode_extra_time(&(einode)->xtime, \
933 raw_inode->xtime ## _extra); \
934 else \
935 (einode)->xtime.tv_nsec = 0; \
936 } while (0)
937
938 #define i_disk_version osd1.linux1.l_i_version
939
940 #if defined(__KERNEL__) || defined(__linux__)
941 #define i_reserved1 osd1.linux1.l_i_reserved1
942 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
943 #define i_blocks_high osd2.linux2.l_i_blocks_high
944 #define i_uid_low i_uid
945 #define i_gid_low i_gid
946 #define i_uid_high osd2.linux2.l_i_uid_high
947 #define i_gid_high osd2.linux2.l_i_gid_high
948 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
949
950 #elif defined(__GNU__)
951
952 #define i_translator osd1.hurd1.h_i_translator
953 #define i_uid_high osd2.hurd2.h_i_uid_high
954 #define i_gid_high osd2.hurd2.h_i_gid_high
955 #define i_author osd2.hurd2.h_i_author
956
957 #elif defined(__masix__)
958
959 #define i_reserved1 osd1.masix1.m_i_reserved1
960 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
961 #define i_reserved2 osd2.masix2.m_i_reserved2
962
963 #endif /* defined(__KERNEL__) || defined(__linux__) */
964
965 #include "extents_status.h"
966 #include "fast_commit.h"
967
968 /*
969 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
970 *
971 * These are needed to avoid lockdep false positives when we need to
972 * allocate blocks to the quota inode during ext4_map_blocks(), while
973 * holding i_data_sem for a normal (non-quota) inode. Since we don't
974 * do quota tracking for the quota inode, this avoids deadlock (as
975 * well as infinite recursion, since it isn't turtles all the way
976 * down...)
977 *
978 * I_DATA_SEM_NORMAL - Used for most inodes
979 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
980 * where the second inode has larger inode number
981 * than the first
982 * I_DATA_SEM_QUOTA - Used for quota inodes only
983 */
984 enum {
985 I_DATA_SEM_NORMAL = 0,
986 I_DATA_SEM_OTHER,
987 I_DATA_SEM_QUOTA,
988 };
989
990
991 /*
992 * fourth extended file system inode data in memory
993 */
994 struct ext4_inode_info {
995 __le32 i_data[15]; /* unconverted */
996 __u32 i_dtime;
997 ext4_fsblk_t i_file_acl;
998
999 /*
1000 * i_block_group is the number of the block group which contains
1001 * this file's inode. Constant across the lifetime of the inode,
1002 * it is used for making block allocation decisions - we try to
1003 * place a file's data blocks near its inode block, and new inodes
1004 * near to their parent directory's inode.
1005 */
1006 ext4_group_t i_block_group;
1007 ext4_lblk_t i_dir_start_lookup;
1008 #if (BITS_PER_LONG < 64)
1009 unsigned long i_state_flags; /* Dynamic state flags */
1010 #endif
1011 unsigned long i_flags;
1012
1013 /*
1014 * Extended attributes can be read independently of the main file
1015 * data. Taking i_mutex even when reading would cause contention
1016 * between readers of EAs and writers of regular file data, so
1017 * instead we synchronize on xattr_sem when reading or changing
1018 * EAs.
1019 */
1020 struct rw_semaphore xattr_sem;
1021
1022 struct list_head i_orphan; /* unlinked but open inodes */
1023
1024 /* Fast commit related info */
1025
1026 struct list_head i_fc_list; /*
1027 * inodes that need fast commit
1028 * protected by sbi->s_fc_lock.
1029 */
1030
1031 /* Start of lblk range that needs to be committed in this fast commit */
1032 ext4_lblk_t i_fc_lblk_start;
1033
1034 /* End of lblk range that needs to be committed in this fast commit */
1035 ext4_lblk_t i_fc_lblk_len;
1036
1037 /* Number of ongoing updates on this inode */
1038 atomic_t i_fc_updates;
1039
1040 /* Fast commit wait queue for this inode */
1041 wait_queue_head_t i_fc_wait;
1042
1043 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1044 struct mutex i_fc_lock;
1045
1046 /*
1047 * i_disksize keeps track of what the inode size is ON DISK, not
1048 * in memory. During truncate, i_size is set to the new size by
1049 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1050 * set i_disksize to 0 until the truncate is actually under way.
1051 *
1052 * The intent is that i_disksize always represents the blocks which
1053 * are used by this file. This allows recovery to restart truncate
1054 * on orphans if we crash during truncate. We actually write i_disksize
1055 * into the on-disk inode when writing inodes out, instead of i_size.
1056 *
1057 * The only time when i_disksize and i_size may be different is when
1058 * a truncate is in progress. The only things which change i_disksize
1059 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1060 */
1061 loff_t i_disksize;
1062
1063 /*
1064 * i_data_sem is for serialising ext4_truncate() against
1065 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1066 * data tree are chopped off during truncate. We can't do that in
1067 * ext4 because whenever we perform intermediate commits during
1068 * truncate, the inode and all the metadata blocks *must* be in a
1069 * consistent state which allows truncation of the orphans to restart
1070 * during recovery. Hence we must fix the get_block-vs-truncate race
1071 * by other means, so we have i_data_sem.
1072 */
1073 struct rw_semaphore i_data_sem;
1074 /*
1075 * i_mmap_sem is for serializing page faults with truncate / punch hole
1076 * operations. We have to make sure that new page cannot be faulted in
1077 * a section of the inode that is being punched. We cannot easily use
1078 * i_data_sem for this since we need protection for the whole punch
1079 * operation and i_data_sem ranks below transaction start so we have
1080 * to occasionally drop it.
1081 */
1082 struct rw_semaphore i_mmap_sem;
1083 struct inode vfs_inode;
1084 struct jbd2_inode *jinode;
1085
1086 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1087
1088 /*
1089 * File creation time. Its function is same as that of
1090 * struct timespec64 i_{a,c,m}time in the generic inode.
1091 */
1092 struct timespec64 i_crtime;
1093
1094 /* mballoc */
1095 atomic_t i_prealloc_active;
1096 struct list_head i_prealloc_list;
1097 spinlock_t i_prealloc_lock;
1098
1099 /* extents status tree */
1100 struct ext4_es_tree i_es_tree;
1101 rwlock_t i_es_lock;
1102 struct list_head i_es_list;
1103 unsigned int i_es_all_nr; /* protected by i_es_lock */
1104 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1105 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1106 extents to shrink. Protected by
1107 i_es_lock */
1108
1109 /* ialloc */
1110 ext4_group_t i_last_alloc_group;
1111
1112 /* allocation reservation info for delalloc */
1113 /* In case of bigalloc, this refer to clusters rather than blocks */
1114 unsigned int i_reserved_data_blocks;
1115
1116 /* pending cluster reservations for bigalloc file systems */
1117 struct ext4_pending_tree i_pending_tree;
1118
1119 /* on-disk additional length */
1120 __u16 i_extra_isize;
1121
1122 /* Indicate the inline data space. */
1123 u16 i_inline_off;
1124 u16 i_inline_size;
1125
1126 #ifdef CONFIG_QUOTA
1127 /* quota space reservation, managed internally by quota code */
1128 qsize_t i_reserved_quota;
1129 #endif
1130
1131 /* Lock protecting lists below */
1132 spinlock_t i_completed_io_lock;
1133 /*
1134 * Completed IOs that need unwritten extents handling and have
1135 * transaction reserved
1136 */
1137 struct list_head i_rsv_conversion_list;
1138 struct work_struct i_rsv_conversion_work;
1139 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1140
1141 spinlock_t i_block_reservation_lock;
1142
1143 /*
1144 * Transactions that contain inode's metadata needed to complete
1145 * fsync and fdatasync, respectively.
1146 */
1147 tid_t i_sync_tid;
1148 tid_t i_datasync_tid;
1149
1150 #ifdef CONFIG_QUOTA
1151 struct dquot *i_dquot[MAXQUOTAS];
1152 #endif
1153
1154 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1155 __u32 i_csum_seed;
1156
1157 kprojid_t i_projid;
1158 };
1159
1160 /*
1161 * File system states
1162 */
1163 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1164 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1165 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1166 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1167
1168 /*
1169 * Misc. filesystem flags
1170 */
1171 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1172 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1173 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1174
1175 /*
1176 * Mount flags set via mount options or defaults
1177 */
1178 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1179 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1180 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1181 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1182 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1183 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1184 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1185 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1186 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1187 #ifdef CONFIG_FS_DAX
1188 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1189 #else
1190 #define EXT4_MOUNT_DAX_ALWAYS 0
1191 #endif
1192 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1193 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1194 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1195 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1196 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1197 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1198 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1199 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1200 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1201 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1202 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1203 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1204 * enable enforcement for hidden
1205 * quota files */
1206 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1207 * enforcement for hidden quota
1208 * files */
1209 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1210 * enforcement */
1211 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1212 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1213 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1214 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1215 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
1216 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1217 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1218 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1219 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1220 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1221
1222 /*
1223 * Mount flags set either automatically (could not be set by mount option)
1224 * based on per file system feature or property or in special cases such as
1225 * distinguishing between explicit mount option definition and default.
1226 */
1227 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1228 specified delalloc */
1229 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1230 size of blocksize * 8
1231 blocks */
1232 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1233 file systems */
1234 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1235 specified journal checksum */
1236
1237 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1238 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1239 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1240
1241
1242 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1243 ~EXT4_MOUNT_##opt
1244 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1245 EXT4_MOUNT_##opt
1246 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1247 EXT4_MOUNT_##opt)
1248
1249 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1250 ~EXT4_MOUNT2_##opt
1251 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1252 EXT4_MOUNT2_##opt
1253 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1254 EXT4_MOUNT2_##opt)
1255
1256 #define ext4_test_and_set_bit __test_and_set_bit_le
1257 #define ext4_set_bit __set_bit_le
1258 #define ext4_set_bit_atomic ext2_set_bit_atomic
1259 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1260 #define ext4_clear_bit __clear_bit_le
1261 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1262 #define ext4_test_bit test_bit_le
1263 #define ext4_find_next_zero_bit find_next_zero_bit_le
1264 #define ext4_find_next_bit find_next_bit_le
1265
1266 extern void ext4_set_bits(void *bm, int cur, int len);
1267
1268 /*
1269 * Maximal mount counts between two filesystem checks
1270 */
1271 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1272 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1273
1274 /*
1275 * Behaviour when detecting errors
1276 */
1277 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1278 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1279 #define EXT4_ERRORS_PANIC 3 /* Panic */
1280 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1281
1282 /* Metadata checksum algorithm codes */
1283 #define EXT4_CRC32C_CHKSUM 1
1284
1285 /*
1286 * Structure of the super block
1287 */
1288 struct ext4_super_block {
1289 /*00*/ __le32 s_inodes_count; /* Inodes count */
1290 __le32 s_blocks_count_lo; /* Blocks count */
1291 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1292 __le32 s_free_blocks_count_lo; /* Free blocks count */
1293 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1294 __le32 s_first_data_block; /* First Data Block */
1295 __le32 s_log_block_size; /* Block size */
1296 __le32 s_log_cluster_size; /* Allocation cluster size */
1297 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1298 __le32 s_clusters_per_group; /* # Clusters per group */
1299 __le32 s_inodes_per_group; /* # Inodes per group */
1300 __le32 s_mtime; /* Mount time */
1301 /*30*/ __le32 s_wtime; /* Write time */
1302 __le16 s_mnt_count; /* Mount count */
1303 __le16 s_max_mnt_count; /* Maximal mount count */
1304 __le16 s_magic; /* Magic signature */
1305 __le16 s_state; /* File system state */
1306 __le16 s_errors; /* Behaviour when detecting errors */
1307 __le16 s_minor_rev_level; /* minor revision level */
1308 /*40*/ __le32 s_lastcheck; /* time of last check */
1309 __le32 s_checkinterval; /* max. time between checks */
1310 __le32 s_creator_os; /* OS */
1311 __le32 s_rev_level; /* Revision level */
1312 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1313 __le16 s_def_resgid; /* Default gid for reserved blocks */
1314 /*
1315 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1316 *
1317 * Note: the difference between the compatible feature set and
1318 * the incompatible feature set is that if there is a bit set
1319 * in the incompatible feature set that the kernel doesn't
1320 * know about, it should refuse to mount the filesystem.
1321 *
1322 * e2fsck's requirements are more strict; if it doesn't know
1323 * about a feature in either the compatible or incompatible
1324 * feature set, it must abort and not try to meddle with
1325 * things it doesn't understand...
1326 */
1327 __le32 s_first_ino; /* First non-reserved inode */
1328 __le16 s_inode_size; /* size of inode structure */
1329 __le16 s_block_group_nr; /* block group # of this superblock */
1330 __le32 s_feature_compat; /* compatible feature set */
1331 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1332 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1333 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1334 /*78*/ char s_volume_name[16]; /* volume name */
1335 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1336 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1337 /*
1338 * Performance hints. Directory preallocation should only
1339 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1340 */
1341 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1342 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1343 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1344 /*
1345 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1346 */
1347 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1348 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1349 __le32 s_journal_dev; /* device number of journal file */
1350 __le32 s_last_orphan; /* start of list of inodes to delete */
1351 __le32 s_hash_seed[4]; /* HTREE hash seed */
1352 __u8 s_def_hash_version; /* Default hash version to use */
1353 __u8 s_jnl_backup_type;
1354 __le16 s_desc_size; /* size of group descriptor */
1355 /*100*/ __le32 s_default_mount_opts;
1356 __le32 s_first_meta_bg; /* First metablock block group */
1357 __le32 s_mkfs_time; /* When the filesystem was created */
1358 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1359 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1360 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1361 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1362 __le32 s_free_blocks_count_hi; /* Free blocks count */
1363 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1364 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1365 __le32 s_flags; /* Miscellaneous flags */
1366 __le16 s_raid_stride; /* RAID stride */
1367 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1368 __le64 s_mmp_block; /* Block for multi-mount protection */
1369 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1370 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1371 __u8 s_checksum_type; /* metadata checksum algorithm used */
1372 __u8 s_encryption_level; /* versioning level for encryption */
1373 __u8 s_reserved_pad; /* Padding to next 32bits */
1374 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1375 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1376 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1377 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1378 snapshot's future use */
1379 __le32 s_snapshot_list; /* inode number of the head of the
1380 on-disk snapshot list */
1381 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1382 __le32 s_error_count; /* number of fs errors */
1383 __le32 s_first_error_time; /* first time an error happened */
1384 __le32 s_first_error_ino; /* inode involved in first error */
1385 __le64 s_first_error_block; /* block involved of first error */
1386 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1387 __le32 s_first_error_line; /* line number where error happened */
1388 __le32 s_last_error_time; /* most recent time of an error */
1389 __le32 s_last_error_ino; /* inode involved in last error */
1390 __le32 s_last_error_line; /* line number where error happened */
1391 __le64 s_last_error_block; /* block involved of last error */
1392 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1393 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1394 __u8 s_mount_opts[64];
1395 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1396 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1397 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1398 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1399 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1400 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1401 __le32 s_lpf_ino; /* Location of the lost+found inode */
1402 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1403 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1404 __u8 s_wtime_hi;
1405 __u8 s_mtime_hi;
1406 __u8 s_mkfs_time_hi;
1407 __u8 s_lastcheck_hi;
1408 __u8 s_first_error_time_hi;
1409 __u8 s_last_error_time_hi;
1410 __u8 s_first_error_errcode;
1411 __u8 s_last_error_errcode;
1412 __le16 s_encoding; /* Filename charset encoding */
1413 __le16 s_encoding_flags; /* Filename charset encoding flags */
1414 __le32 s_reserved[95]; /* Padding to the end of the block */
1415 __le32 s_checksum; /* crc32c(superblock) */
1416 };
1417
1418 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1419
1420 #ifdef __KERNEL__
1421
1422 /* Number of quota types we support */
1423 #define EXT4_MAXQUOTAS 3
1424
1425 #define EXT4_ENC_UTF8_12_1 1
1426
1427 /*
1428 * fourth extended-fs super-block data in memory
1429 */
1430 struct ext4_sb_info {
1431 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1432 unsigned long s_inodes_per_block;/* Number of inodes per block */
1433 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1434 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1435 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1436 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1437 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1438 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1439 ext4_group_t s_groups_count; /* Number of groups in the fs */
1440 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1441 unsigned long s_overhead; /* # of fs overhead clusters */
1442 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1443 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1444 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1445 struct buffer_head * s_sbh; /* Buffer containing the super block */
1446 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1447 struct buffer_head * __rcu *s_group_desc;
1448 unsigned int s_mount_opt;
1449 unsigned int s_mount_opt2;
1450 unsigned long s_mount_flags;
1451 unsigned int s_def_mount_opt;
1452 ext4_fsblk_t s_sb_block;
1453 atomic64_t s_resv_clusters;
1454 kuid_t s_resuid;
1455 kgid_t s_resgid;
1456 unsigned short s_mount_state;
1457 unsigned short s_pad;
1458 int s_addr_per_block_bits;
1459 int s_desc_per_block_bits;
1460 int s_inode_size;
1461 int s_first_ino;
1462 unsigned int s_inode_readahead_blks;
1463 unsigned int s_inode_goal;
1464 u32 s_hash_seed[4];
1465 int s_def_hash_version;
1466 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1467 struct percpu_counter s_freeclusters_counter;
1468 struct percpu_counter s_freeinodes_counter;
1469 struct percpu_counter s_dirs_counter;
1470 struct percpu_counter s_dirtyclusters_counter;
1471 struct percpu_counter s_sra_exceeded_retry_limit;
1472 struct blockgroup_lock *s_blockgroup_lock;
1473 struct proc_dir_entry *s_proc;
1474 struct kobject s_kobj;
1475 struct completion s_kobj_unregister;
1476 struct super_block *s_sb;
1477 struct buffer_head *s_mmp_bh;
1478
1479 /* Journaling */
1480 struct journal_s *s_journal;
1481 struct list_head s_orphan;
1482 struct mutex s_orphan_lock;
1483 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1484 unsigned long s_commit_interval;
1485 u32 s_max_batch_time;
1486 u32 s_min_batch_time;
1487 struct block_device *s_journal_bdev;
1488 #ifdef CONFIG_QUOTA
1489 /* Names of quota files with journalled quota */
1490 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1491 int s_jquota_fmt; /* Format of quota to use */
1492 #endif
1493 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1494 struct ext4_system_blocks __rcu *s_system_blks;
1495
1496 #ifdef EXTENTS_STATS
1497 /* ext4 extents stats */
1498 unsigned long s_ext_min;
1499 unsigned long s_ext_max;
1500 unsigned long s_depth_max;
1501 spinlock_t s_ext_stats_lock;
1502 unsigned long s_ext_blocks;
1503 unsigned long s_ext_extents;
1504 #endif
1505
1506 /* for buddy allocator */
1507 struct ext4_group_info ** __rcu *s_group_info;
1508 struct inode *s_buddy_cache;
1509 spinlock_t s_md_lock;
1510 unsigned short *s_mb_offsets;
1511 unsigned int *s_mb_maxs;
1512 unsigned int s_group_info_size;
1513 unsigned int s_mb_free_pending;
1514 struct list_head s_freed_data_list; /* List of blocks to be freed
1515 after commit completed */
1516
1517 /* tunables */
1518 unsigned long s_stripe;
1519 unsigned int s_mb_stream_request;
1520 unsigned int s_mb_max_to_scan;
1521 unsigned int s_mb_min_to_scan;
1522 unsigned int s_mb_stats;
1523 unsigned int s_mb_order2_reqs;
1524 unsigned int s_mb_group_prealloc;
1525 unsigned int s_mb_max_inode_prealloc;
1526 unsigned int s_max_dir_size_kb;
1527 /* where last allocation was done - for stream allocation */
1528 unsigned long s_mb_last_group;
1529 unsigned long s_mb_last_start;
1530 unsigned int s_mb_prefetch;
1531 unsigned int s_mb_prefetch_limit;
1532
1533 /* stats for buddy allocator */
1534 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1535 atomic_t s_bal_success; /* we found long enough chunks */
1536 atomic_t s_bal_allocated; /* in blocks */
1537 atomic_t s_bal_ex_scanned; /* total extents scanned */
1538 atomic_t s_bal_goals; /* goal hits */
1539 atomic_t s_bal_breaks; /* too long searches */
1540 atomic_t s_bal_2orders; /* 2^order hits */
1541 spinlock_t s_bal_lock;
1542 unsigned long s_mb_buddies_generated;
1543 unsigned long long s_mb_generation_time;
1544 atomic_t s_mb_lost_chunks;
1545 atomic_t s_mb_preallocated;
1546 atomic_t s_mb_discarded;
1547 atomic_t s_lock_busy;
1548
1549 /* locality groups */
1550 struct ext4_locality_group __percpu *s_locality_groups;
1551
1552 /* for write statistics */
1553 unsigned long s_sectors_written_start;
1554 u64 s_kbytes_written;
1555
1556 /* the size of zero-out chunk */
1557 unsigned int s_extent_max_zeroout_kb;
1558
1559 unsigned int s_log_groups_per_flex;
1560 struct flex_groups * __rcu *s_flex_groups;
1561 ext4_group_t s_flex_groups_allocated;
1562
1563 /* workqueue for reserved extent conversions (buffered io) */
1564 struct workqueue_struct *rsv_conversion_wq;
1565
1566 /* timer for periodic error stats printing */
1567 struct timer_list s_err_report;
1568
1569 /* Lazy inode table initialization info */
1570 struct ext4_li_request *s_li_request;
1571 /* Wait multiplier for lazy initialization thread */
1572 unsigned int s_li_wait_mult;
1573
1574 /* Kernel thread for multiple mount protection */
1575 struct task_struct *s_mmp_tsk;
1576
1577 /* record the last minlen when FITRIM is called. */
1578 atomic_t s_last_trim_minblks;
1579
1580 /* Reference to checksum algorithm driver via cryptoapi */
1581 struct crypto_shash *s_chksum_driver;
1582
1583 /* Precomputed FS UUID checksum for seeding other checksums */
1584 __u32 s_csum_seed;
1585
1586 /* Reclaim extents from extent status tree */
1587 struct shrinker s_es_shrinker;
1588 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1589 long s_es_nr_inode;
1590 struct ext4_es_stats s_es_stats;
1591 struct mb_cache *s_ea_block_cache;
1592 struct mb_cache *s_ea_inode_cache;
1593 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1594
1595 /* Ratelimit ext4 messages. */
1596 struct ratelimit_state s_err_ratelimit_state;
1597 struct ratelimit_state s_warning_ratelimit_state;
1598 struct ratelimit_state s_msg_ratelimit_state;
1599 atomic_t s_warning_count;
1600 atomic_t s_msg_count;
1601
1602 /* Encryption policy for '-o test_dummy_encryption' */
1603 struct fscrypt_dummy_policy s_dummy_enc_policy;
1604
1605 /*
1606 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1607 * or EXTENTS flag.
1608 */
1609 struct percpu_rw_semaphore s_writepages_rwsem;
1610 struct dax_device *s_daxdev;
1611 #ifdef CONFIG_EXT4_DEBUG
1612 unsigned long s_simulate_fail;
1613 #endif
1614 /* Record the errseq of the backing block device */
1615 errseq_t s_bdev_wb_err;
1616 spinlock_t s_bdev_wb_lock;
1617
1618 /* Information about errors that happened during this mount */
1619 spinlock_t s_error_lock;
1620 int s_add_error_count;
1621 int s_first_error_code;
1622 __u32 s_first_error_line;
1623 __u32 s_first_error_ino;
1624 __u64 s_first_error_block;
1625 const char *s_first_error_func;
1626 time64_t s_first_error_time;
1627 int s_last_error_code;
1628 __u32 s_last_error_line;
1629 __u32 s_last_error_ino;
1630 __u64 s_last_error_block;
1631 const char *s_last_error_func;
1632 time64_t s_last_error_time;
1633 /*
1634 * If we are in a context where we cannot update error information in
1635 * the on-disk superblock, we queue this work to do it.
1636 */
1637 struct work_struct s_error_work;
1638
1639 /* Ext4 fast commit stuff */
1640 atomic_t s_fc_subtid;
1641 atomic_t s_fc_ineligible_updates;
1642 /*
1643 * After commit starts, the main queue gets locked, and the further
1644 * updates get added in the staging queue.
1645 */
1646 #define FC_Q_MAIN 0
1647 #define FC_Q_STAGING 1
1648 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1649 * that have data changes in them.
1650 */
1651 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1652 unsigned int s_fc_bytes;
1653 /*
1654 * Main fast commit lock. This lock protects accesses to the
1655 * following fields:
1656 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1657 */
1658 spinlock_t s_fc_lock;
1659 struct buffer_head *s_fc_bh;
1660 struct ext4_fc_stats s_fc_stats;
1661 u64 s_fc_avg_commit_time;
1662 #ifdef CONFIG_EXT4_DEBUG
1663 int s_fc_debug_max_replay;
1664 #endif
1665 struct ext4_fc_replay_state s_fc_replay_state;
1666 };
1667
EXT4_SB(struct super_block * sb)1668 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1669 {
1670 return sb->s_fs_info;
1671 }
EXT4_I(struct inode * inode)1672 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1673 {
1674 return container_of(inode, struct ext4_inode_info, vfs_inode);
1675 }
1676
ext4_valid_inum(struct super_block * sb,unsigned long ino)1677 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1678 {
1679 return ino == EXT4_ROOT_INO ||
1680 (ino >= EXT4_FIRST_INO(sb) &&
1681 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1682 }
1683
1684 /*
1685 * Returns: sbi->field[index]
1686 * Used to access an array element from the following sbi fields which require
1687 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1688 * - s_group_desc
1689 * - s_group_info
1690 * - s_flex_group
1691 */
1692 #define sbi_array_rcu_deref(sbi, field, index) \
1693 ({ \
1694 typeof(*((sbi)->field)) _v; \
1695 rcu_read_lock(); \
1696 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1697 rcu_read_unlock(); \
1698 _v; \
1699 })
1700
1701 /*
1702 * run-time mount flags
1703 */
1704 enum {
1705 EXT4_MF_MNTDIR_SAMPLED,
1706 EXT4_MF_FS_ABORTED, /* Fatal error detected */
1707 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */
1708 EXT4_MF_FC_COMMITTING /* File system underoing a fast
1709 * commit.
1710 */
1711 };
1712
ext4_set_mount_flag(struct super_block * sb,int bit)1713 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1714 {
1715 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1716 }
1717
ext4_clear_mount_flag(struct super_block * sb,int bit)1718 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1719 {
1720 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1721 }
1722
ext4_test_mount_flag(struct super_block * sb,int bit)1723 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1724 {
1725 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1726 }
1727
1728
1729 /*
1730 * Simulate_fail codes
1731 */
1732 #define EXT4_SIM_BBITMAP_EIO 1
1733 #define EXT4_SIM_BBITMAP_CRC 2
1734 #define EXT4_SIM_IBITMAP_EIO 3
1735 #define EXT4_SIM_IBITMAP_CRC 4
1736 #define EXT4_SIM_INODE_EIO 5
1737 #define EXT4_SIM_INODE_CRC 6
1738 #define EXT4_SIM_DIRBLOCK_EIO 7
1739 #define EXT4_SIM_DIRBLOCK_CRC 8
1740
ext4_simulate_fail(struct super_block * sb,unsigned long code)1741 static inline bool ext4_simulate_fail(struct super_block *sb,
1742 unsigned long code)
1743 {
1744 #ifdef CONFIG_EXT4_DEBUG
1745 struct ext4_sb_info *sbi = EXT4_SB(sb);
1746
1747 if (unlikely(sbi->s_simulate_fail == code)) {
1748 sbi->s_simulate_fail = 0;
1749 return true;
1750 }
1751 #endif
1752 return false;
1753 }
1754
ext4_simulate_fail_bh(struct super_block * sb,struct buffer_head * bh,unsigned long code)1755 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1756 struct buffer_head *bh,
1757 unsigned long code)
1758 {
1759 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1760 clear_buffer_uptodate(bh);
1761 }
1762
1763 /*
1764 * Error number codes for s_{first,last}_error_errno
1765 *
1766 * Linux errno numbers are architecture specific, so we need to translate
1767 * them into something which is architecture independent. We don't define
1768 * codes for all errno's; just the ones which are most likely to be the cause
1769 * of an ext4_error() call.
1770 */
1771 #define EXT4_ERR_UNKNOWN 1
1772 #define EXT4_ERR_EIO 2
1773 #define EXT4_ERR_ENOMEM 3
1774 #define EXT4_ERR_EFSBADCRC 4
1775 #define EXT4_ERR_EFSCORRUPTED 5
1776 #define EXT4_ERR_ENOSPC 6
1777 #define EXT4_ERR_ENOKEY 7
1778 #define EXT4_ERR_EROFS 8
1779 #define EXT4_ERR_EFBIG 9
1780 #define EXT4_ERR_EEXIST 10
1781 #define EXT4_ERR_ERANGE 11
1782 #define EXT4_ERR_EOVERFLOW 12
1783 #define EXT4_ERR_EBUSY 13
1784 #define EXT4_ERR_ENOTDIR 14
1785 #define EXT4_ERR_ENOTEMPTY 15
1786 #define EXT4_ERR_ESHUTDOWN 16
1787 #define EXT4_ERR_EFAULT 17
1788
1789 /*
1790 * Inode dynamic state flags
1791 */
1792 enum {
1793 EXT4_STATE_JDATA, /* journaled data exists */
1794 EXT4_STATE_NEW, /* inode is newly created */
1795 EXT4_STATE_XATTR, /* has in-inode xattrs */
1796 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1797 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1798 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1799 EXT4_STATE_NEWENTRY, /* File just added to dir */
1800 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1801 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1802 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1803 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1804 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1805 };
1806
1807 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1808 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1809 { \
1810 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1811 } \
1812 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1813 { \
1814 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1815 } \
1816 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1817 { \
1818 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1819 }
1820
1821 /* Add these declarations here only so that these functions can be
1822 * found by name. Otherwise, they are very hard to locate. */
1823 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1824 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1825 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1826 EXT4_INODE_BIT_FNS(flag, flags, 0)
1827
1828 /* Add these declarations here only so that these functions can be
1829 * found by name. Otherwise, they are very hard to locate. */
1830 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1831 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1832 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1833 #if (BITS_PER_LONG < 64)
1834 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1835
ext4_clear_state_flags(struct ext4_inode_info * ei)1836 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1837 {
1838 (ei)->i_state_flags = 0;
1839 }
1840 #else
1841 EXT4_INODE_BIT_FNS(state, flags, 32)
1842
ext4_clear_state_flags(struct ext4_inode_info * ei)1843 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1844 {
1845 /* We depend on the fact that callers will set i_flags */
1846 }
1847 #endif
1848 #else
1849 /* Assume that user mode programs are passing in an ext4fs superblock, not
1850 * a kernel struct super_block. This will allow us to call the feature-test
1851 * macros from user land. */
1852 #define EXT4_SB(sb) (sb)
1853 #endif
1854
ext4_verity_in_progress(struct inode * inode)1855 static inline bool ext4_verity_in_progress(struct inode *inode)
1856 {
1857 return IS_ENABLED(CONFIG_FS_VERITY) &&
1858 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1859 }
1860
1861 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1862
1863 /*
1864 * Codes for operating systems
1865 */
1866 #define EXT4_OS_LINUX 0
1867 #define EXT4_OS_HURD 1
1868 #define EXT4_OS_MASIX 2
1869 #define EXT4_OS_FREEBSD 3
1870 #define EXT4_OS_LITES 4
1871
1872 /*
1873 * Revision levels
1874 */
1875 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1876 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1877
1878 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1879 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1880
1881 #define EXT4_GOOD_OLD_INODE_SIZE 128
1882
1883 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1884 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1885 #define EXT4_TIMESTAMP_MIN S32_MIN
1886
1887 /*
1888 * Feature set definitions
1889 */
1890
1891 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1892 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1893 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1894 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1895 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1896 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1897 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1898 /*
1899 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1900 * incompatible only if fast commit blocks are present in the FS. Since we
1901 * clear the journal (and thus the fast commit blocks), we don't mark FS as
1902 * incompatible. We also have a JBD2 incompat feature, which gets set when
1903 * there are fast commit blocks present in the journal.
1904 */
1905 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
1906 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1907
1908 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1909 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1910 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1911 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1912 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1913 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1914 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1915 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1916 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1917 /*
1918 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1919 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1920 * all other data structures' checksums. However, the METADATA_CSUM and
1921 * GDT_CSUM bits are mutually exclusive.
1922 */
1923 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1924 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1925 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1926 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
1927
1928 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1929 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1930 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1931 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1932 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1933 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1934 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1935 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1936 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1937 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1938 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1939 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1940 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1941 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1942 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1943 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
1944
1945 extern void ext4_update_dynamic_rev(struct super_block *sb);
1946
1947 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1948 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1949 { \
1950 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1951 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1952 } \
1953 static inline void ext4_set_feature_##name(struct super_block *sb) \
1954 { \
1955 ext4_update_dynamic_rev(sb); \
1956 EXT4_SB(sb)->s_es->s_feature_compat |= \
1957 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1958 } \
1959 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1960 { \
1961 EXT4_SB(sb)->s_es->s_feature_compat &= \
1962 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1963 }
1964
1965 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1966 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1967 { \
1968 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1969 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1970 } \
1971 static inline void ext4_set_feature_##name(struct super_block *sb) \
1972 { \
1973 ext4_update_dynamic_rev(sb); \
1974 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1975 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1976 } \
1977 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1978 { \
1979 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1980 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1981 }
1982
1983 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1984 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1985 { \
1986 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1987 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1988 } \
1989 static inline void ext4_set_feature_##name(struct super_block *sb) \
1990 { \
1991 ext4_update_dynamic_rev(sb); \
1992 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1993 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1994 } \
1995 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1996 { \
1997 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1998 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1999 }
2000
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc,DIR_PREALLOC)2001 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2002 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2003 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2004 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2005 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2006 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2007 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2008 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2009 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2010
2011 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2012 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2013 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2014 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2015 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2016 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2017 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2018 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2019 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2020 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2021 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2022 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2023 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2024
2025 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2026 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2027 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2028 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2029 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2030 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2031 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2032 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2033 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2034 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2035 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2036 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2037 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2038 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2039 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2040 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2041
2042 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2043 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2044 EXT4_FEATURE_INCOMPAT_META_BG)
2045 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2046 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2047 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2048
2049 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2050 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2051 EXT4_FEATURE_INCOMPAT_RECOVER| \
2052 EXT4_FEATURE_INCOMPAT_META_BG)
2053 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2054 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2055 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2056
2057 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2058 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2059 EXT4_FEATURE_INCOMPAT_RECOVER| \
2060 EXT4_FEATURE_INCOMPAT_META_BG| \
2061 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2062 EXT4_FEATURE_INCOMPAT_64BIT| \
2063 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2064 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2065 EXT4_FEATURE_INCOMPAT_MMP | \
2066 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2067 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2068 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2069 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2070 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2071 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2072 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2073 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2074 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2075 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2076 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2077 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2078 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2079 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2080 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2081 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2082 EXT4_FEATURE_RO_COMPAT_VERITY)
2083
2084 #define EXTN_FEATURE_FUNCS(ver) \
2085 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2086 { \
2087 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2088 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2089 } \
2090 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2091 { \
2092 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2093 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2094 } \
2095 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2096 { \
2097 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2098 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2099 }
2100
2101 EXTN_FEATURE_FUNCS(2)
2102 EXTN_FEATURE_FUNCS(3)
2103 EXTN_FEATURE_FUNCS(4)
2104
2105 static inline bool ext4_has_compat_features(struct super_block *sb)
2106 {
2107 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2108 }
ext4_has_ro_compat_features(struct super_block * sb)2109 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2110 {
2111 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2112 }
ext4_has_incompat_features(struct super_block * sb)2113 static inline bool ext4_has_incompat_features(struct super_block *sb)
2114 {
2115 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2116 }
2117
2118 /*
2119 * Superblock flags
2120 */
2121 #define EXT4_FLAGS_RESIZING 0
2122 #define EXT4_FLAGS_SHUTDOWN 1
2123 #define EXT4_FLAGS_BDEV_IS_DAX 2
2124
ext4_forced_shutdown(struct ext4_sb_info * sbi)2125 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2126 {
2127 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2128 }
2129
2130
2131 /*
2132 * Default values for user and/or group using reserved blocks
2133 */
2134 #define EXT4_DEF_RESUID 0
2135 #define EXT4_DEF_RESGID 0
2136
2137 /*
2138 * Default project ID
2139 */
2140 #define EXT4_DEF_PROJID 0
2141
2142 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2143
2144 /*
2145 * Default mount options
2146 */
2147 #define EXT4_DEFM_DEBUG 0x0001
2148 #define EXT4_DEFM_BSDGROUPS 0x0002
2149 #define EXT4_DEFM_XATTR_USER 0x0004
2150 #define EXT4_DEFM_ACL 0x0008
2151 #define EXT4_DEFM_UID16 0x0010
2152 #define EXT4_DEFM_JMODE 0x0060
2153 #define EXT4_DEFM_JMODE_DATA 0x0020
2154 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2155 #define EXT4_DEFM_JMODE_WBACK 0x0060
2156 #define EXT4_DEFM_NOBARRIER 0x0100
2157 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2158 #define EXT4_DEFM_DISCARD 0x0400
2159 #define EXT4_DEFM_NODELALLOC 0x0800
2160
2161 /*
2162 * Default journal batch times
2163 */
2164 #define EXT4_DEF_MIN_BATCH_TIME 0
2165 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2166
2167 /*
2168 * Minimum number of groups in a flexgroup before we separate out
2169 * directories into the first block group of a flexgroup
2170 */
2171 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2172
2173 /*
2174 * Structure of a directory entry
2175 */
2176 #define EXT4_NAME_LEN 255
2177 /*
2178 * Base length of the ext4 directory entry excluding the name length
2179 */
2180 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2181
2182 struct ext4_dir_entry {
2183 __le32 inode; /* Inode number */
2184 __le16 rec_len; /* Directory entry length */
2185 __le16 name_len; /* Name length */
2186 char name[EXT4_NAME_LEN]; /* File name */
2187 };
2188
2189 /*
2190 * The new version of the directory entry. Since EXT4 structures are
2191 * stored in intel byte order, and the name_len field could never be
2192 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2193 * file_type field.
2194 */
2195 struct ext4_dir_entry_2 {
2196 __le32 inode; /* Inode number */
2197 __le16 rec_len; /* Directory entry length */
2198 __u8 name_len; /* Name length */
2199 __u8 file_type; /* See file type macros EXT4_FT_* below */
2200 char name[EXT4_NAME_LEN]; /* File name */
2201 };
2202
2203 /*
2204 * This is a bogus directory entry at the end of each leaf block that
2205 * records checksums.
2206 */
2207 struct ext4_dir_entry_tail {
2208 __le32 det_reserved_zero1; /* Pretend to be unused */
2209 __le16 det_rec_len; /* 12 */
2210 __u8 det_reserved_zero2; /* Zero name length */
2211 __u8 det_reserved_ft; /* 0xDE, fake file type */
2212 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2213 };
2214
2215 #define EXT4_DIRENT_TAIL(block, blocksize) \
2216 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2217 ((blocksize) - \
2218 sizeof(struct ext4_dir_entry_tail))))
2219
2220 /*
2221 * Ext4 directory file types. Only the low 3 bits are used. The
2222 * other bits are reserved for now.
2223 */
2224 #define EXT4_FT_UNKNOWN 0
2225 #define EXT4_FT_REG_FILE 1
2226 #define EXT4_FT_DIR 2
2227 #define EXT4_FT_CHRDEV 3
2228 #define EXT4_FT_BLKDEV 4
2229 #define EXT4_FT_FIFO 5
2230 #define EXT4_FT_SOCK 6
2231 #define EXT4_FT_SYMLINK 7
2232
2233 #define EXT4_FT_MAX 8
2234
2235 #define EXT4_FT_DIR_CSUM 0xDE
2236
2237 /*
2238 * EXT4_DIR_PAD defines the directory entries boundaries
2239 *
2240 * NOTE: It must be a multiple of 4
2241 */
2242 #define EXT4_DIR_PAD 4
2243 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2244 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
2245 ~EXT4_DIR_ROUND)
2246 #define EXT4_MAX_REC_LEN ((1<<16)-1)
2247
2248 /*
2249 * If we ever get support for fs block sizes > page_size, we'll need
2250 * to remove the #if statements in the next two functions...
2251 */
2252 static inline unsigned int
ext4_rec_len_from_disk(__le16 dlen,unsigned blocksize)2253 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2254 {
2255 unsigned len = le16_to_cpu(dlen);
2256
2257 #if (PAGE_SIZE >= 65536)
2258 if (len == EXT4_MAX_REC_LEN || len == 0)
2259 return blocksize;
2260 return (len & 65532) | ((len & 3) << 16);
2261 #else
2262 return len;
2263 #endif
2264 }
2265
ext4_rec_len_to_disk(unsigned len,unsigned blocksize)2266 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2267 {
2268 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2269 BUG();
2270 #if (PAGE_SIZE >= 65536)
2271 if (len < 65536)
2272 return cpu_to_le16(len);
2273 if (len == blocksize) {
2274 if (blocksize == 65536)
2275 return cpu_to_le16(EXT4_MAX_REC_LEN);
2276 else
2277 return cpu_to_le16(0);
2278 }
2279 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2280 #else
2281 return cpu_to_le16(len);
2282 #endif
2283 }
2284
2285 /*
2286 * Hash Tree Directory indexing
2287 * (c) Daniel Phillips, 2001
2288 */
2289
2290 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2291 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2292 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2293 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2294 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2295
2296 /* Legal values for the dx_root hash_version field: */
2297
2298 #define DX_HASH_LEGACY 0
2299 #define DX_HASH_HALF_MD4 1
2300 #define DX_HASH_TEA 2
2301 #define DX_HASH_LEGACY_UNSIGNED 3
2302 #define DX_HASH_HALF_MD4_UNSIGNED 4
2303 #define DX_HASH_TEA_UNSIGNED 5
2304
ext4_chksum(struct ext4_sb_info * sbi,u32 crc,const void * address,unsigned int length)2305 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2306 const void *address, unsigned int length)
2307 {
2308 struct {
2309 struct shash_desc shash;
2310 char ctx[4];
2311 } desc;
2312
2313 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2314
2315 desc.shash.tfm = sbi->s_chksum_driver;
2316 *(u32 *)desc.ctx = crc;
2317
2318 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2319
2320 return *(u32 *)desc.ctx;
2321 }
2322
2323 #ifdef __KERNEL__
2324
2325 /* hash info structure used by the directory hash */
2326 struct dx_hash_info
2327 {
2328 u32 hash;
2329 u32 minor_hash;
2330 int hash_version;
2331 u32 *seed;
2332 };
2333
2334
2335 /* 32 and 64 bit signed EOF for dx directories */
2336 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2337 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2338
2339
2340 /*
2341 * Control parameters used by ext4_htree_next_block
2342 */
2343 #define HASH_NB_ALWAYS 1
2344
2345 struct ext4_filename {
2346 const struct qstr *usr_fname;
2347 struct fscrypt_str disk_name;
2348 struct dx_hash_info hinfo;
2349 #ifdef CONFIG_FS_ENCRYPTION
2350 struct fscrypt_str crypto_buf;
2351 #endif
2352 #ifdef CONFIG_UNICODE
2353 struct fscrypt_str cf_name;
2354 #endif
2355 };
2356
2357 #define fname_name(p) ((p)->disk_name.name)
2358 #define fname_len(p) ((p)->disk_name.len)
2359
2360 /*
2361 * Describe an inode's exact location on disk and in memory
2362 */
2363 struct ext4_iloc
2364 {
2365 struct buffer_head *bh;
2366 unsigned long offset;
2367 ext4_group_t block_group;
2368 };
2369
ext4_raw_inode(struct ext4_iloc * iloc)2370 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2371 {
2372 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2373 }
2374
ext4_is_quota_file(struct inode * inode)2375 static inline bool ext4_is_quota_file(struct inode *inode)
2376 {
2377 return IS_NOQUOTA(inode) &&
2378 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2379 }
2380
2381 /*
2382 * This structure is stuffed into the struct file's private_data field
2383 * for directories. It is where we put information so that we can do
2384 * readdir operations in hash tree order.
2385 */
2386 struct dir_private_info {
2387 struct rb_root root;
2388 struct rb_node *curr_node;
2389 struct fname *extra_fname;
2390 loff_t last_pos;
2391 __u32 curr_hash;
2392 __u32 curr_minor_hash;
2393 __u32 next_hash;
2394 };
2395
2396 /* calculate the first block number of the group */
2397 static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block * sb,ext4_group_t group_no)2398 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2399 {
2400 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2401 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2402 }
2403
2404 /*
2405 * Special error return code only used by dx_probe() and its callers.
2406 */
2407 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2408
2409 /* htree levels for ext4 */
2410 #define EXT4_HTREE_LEVEL_COMPAT 2
2411 #define EXT4_HTREE_LEVEL 3
2412
ext4_dir_htree_level(struct super_block * sb)2413 static inline int ext4_dir_htree_level(struct super_block *sb)
2414 {
2415 return ext4_has_feature_largedir(sb) ?
2416 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2417 }
2418
2419 /*
2420 * Timeout and state flag for lazy initialization inode thread.
2421 */
2422 #define EXT4_DEF_LI_WAIT_MULT 10
2423 #define EXT4_DEF_LI_MAX_START_DELAY 5
2424 #define EXT4_LAZYINIT_QUIT 0x0001
2425 #define EXT4_LAZYINIT_RUNNING 0x0002
2426
2427 /*
2428 * Lazy inode table initialization info
2429 */
2430 struct ext4_lazy_init {
2431 unsigned long li_state;
2432 struct list_head li_request_list;
2433 struct mutex li_list_mtx;
2434 };
2435
2436 enum ext4_li_mode {
2437 EXT4_LI_MODE_PREFETCH_BBITMAP,
2438 EXT4_LI_MODE_ITABLE,
2439 };
2440
2441 struct ext4_li_request {
2442 struct super_block *lr_super;
2443 enum ext4_li_mode lr_mode;
2444 ext4_group_t lr_first_not_zeroed;
2445 ext4_group_t lr_next_group;
2446 struct list_head lr_request;
2447 unsigned long lr_next_sched;
2448 unsigned long lr_timeout;
2449 };
2450
2451 struct ext4_features {
2452 struct kobject f_kobj;
2453 struct completion f_kobj_unregister;
2454 };
2455
2456 /*
2457 * This structure will be used for multiple mount protection. It will be
2458 * written into the block number saved in the s_mmp_block field in the
2459 * superblock. Programs that check MMP should assume that if
2460 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2461 * to use the filesystem, regardless of how old the timestamp is.
2462 */
2463 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2464 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2465 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2466 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2467
2468 struct mmp_struct {
2469 __le32 mmp_magic; /* Magic number for MMP */
2470 __le32 mmp_seq; /* Sequence no. updated periodically */
2471
2472 /*
2473 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2474 * purposes and do not affect the correctness of the algorithm
2475 */
2476 __le64 mmp_time; /* Time last updated */
2477 char mmp_nodename[64]; /* Node which last updated MMP block */
2478 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2479
2480 /*
2481 * mmp_check_interval is used to verify if the MMP block has been
2482 * updated on the block device. The value is updated based on the
2483 * maximum time to write the MMP block during an update cycle.
2484 */
2485 __le16 mmp_check_interval;
2486
2487 __le16 mmp_pad1;
2488 __le32 mmp_pad2[226];
2489 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2490 };
2491
2492 /* arguments passed to the mmp thread */
2493 struct mmpd_data {
2494 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2495 struct super_block *sb; /* super block of the fs */
2496 };
2497
2498 /*
2499 * Check interval multiplier
2500 * The MMP block is written every update interval and initially checked every
2501 * update interval x the multiplier (the value is then adapted based on the
2502 * write latency). The reason is that writes can be delayed under load and we
2503 * don't want readers to incorrectly assume that the filesystem is no longer
2504 * in use.
2505 */
2506 #define EXT4_MMP_CHECK_MULT 2UL
2507
2508 /*
2509 * Minimum interval for MMP checking in seconds.
2510 */
2511 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2512
2513 /*
2514 * Maximum interval for MMP checking in seconds.
2515 */
2516 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2517
2518 /*
2519 * Function prototypes
2520 */
2521
2522 /*
2523 * Ok, these declarations are also in <linux/kernel.h> but none of the
2524 * ext4 source programs needs to include it so they are duplicated here.
2525 */
2526 # define NORET_TYPE /**/
2527 # define ATTRIB_NORET __attribute__((noreturn))
2528 # define NORET_AND noreturn,
2529
2530 /* bitmap.c */
2531 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2532 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2533 struct ext4_group_desc *gdp,
2534 struct buffer_head *bh, int sz);
2535 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2536 struct ext4_group_desc *gdp,
2537 struct buffer_head *bh, int sz);
2538 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2539 struct ext4_group_desc *gdp,
2540 struct buffer_head *bh);
2541 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2542 struct ext4_group_desc *gdp,
2543 struct buffer_head *bh);
2544
2545 /* balloc.c */
2546 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2547 ext4_fsblk_t blocknr,
2548 ext4_group_t *blockgrpp,
2549 ext4_grpblk_t *offsetp);
2550 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2551 ext4_fsblk_t block);
2552
2553 extern unsigned int ext4_block_group(struct super_block *sb,
2554 ext4_fsblk_t blocknr);
2555 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2556 ext4_fsblk_t blocknr);
2557 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2558 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2559 ext4_group_t group);
2560 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2561 ext4_fsblk_t goal,
2562 unsigned int flags,
2563 unsigned long *count,
2564 int *errp);
2565 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2566 s64 nclusters, unsigned int flags);
2567 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2568 extern void ext4_check_blocks_bitmap(struct super_block *);
2569 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2570 ext4_group_t block_group,
2571 struct buffer_head ** bh);
2572 extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2573 ext4_group_t group);
2574 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2575
2576 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2577 ext4_group_t block_group,
2578 bool ignore_locked);
2579 extern int ext4_wait_block_bitmap(struct super_block *sb,
2580 ext4_group_t block_group,
2581 struct buffer_head *bh);
2582 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2583 ext4_group_t block_group);
2584 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2585 ext4_group_t block_group,
2586 struct ext4_group_desc *gdp);
2587 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2588
2589 #ifdef CONFIG_UNICODE
2590 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2591 const struct qstr *iname,
2592 struct fscrypt_str *fname);
2593 #endif
2594
2595 #ifdef CONFIG_FS_ENCRYPTION
ext4_fname_from_fscrypt_name(struct ext4_filename * dst,const struct fscrypt_name * src)2596 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2597 const struct fscrypt_name *src)
2598 {
2599 memset(dst, 0, sizeof(*dst));
2600
2601 dst->usr_fname = src->usr_fname;
2602 dst->disk_name = src->disk_name;
2603 dst->hinfo.hash = src->hash;
2604 dst->hinfo.minor_hash = src->minor_hash;
2605 dst->crypto_buf = src->crypto_buf;
2606 }
2607
ext4_fname_setup_filename(struct inode * dir,const struct qstr * iname,int lookup,struct ext4_filename * fname)2608 static inline int ext4_fname_setup_filename(struct inode *dir,
2609 const struct qstr *iname,
2610 int lookup,
2611 struct ext4_filename *fname)
2612 {
2613 struct fscrypt_name name;
2614 int err;
2615
2616 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2617 if (err)
2618 return err;
2619
2620 ext4_fname_from_fscrypt_name(fname, &name);
2621
2622 #ifdef CONFIG_UNICODE
2623 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2624 #endif
2625 return 0;
2626 }
2627
ext4_fname_prepare_lookup(struct inode * dir,struct dentry * dentry,struct ext4_filename * fname)2628 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2629 struct dentry *dentry,
2630 struct ext4_filename *fname)
2631 {
2632 struct fscrypt_name name;
2633 int err;
2634
2635 err = fscrypt_prepare_lookup(dir, dentry, &name);
2636 if (err)
2637 return err;
2638
2639 ext4_fname_from_fscrypt_name(fname, &name);
2640
2641 #ifdef CONFIG_UNICODE
2642 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2643 #endif
2644 return 0;
2645 }
2646
ext4_fname_free_filename(struct ext4_filename * fname)2647 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2648 {
2649 struct fscrypt_name name;
2650
2651 name.crypto_buf = fname->crypto_buf;
2652 fscrypt_free_filename(&name);
2653
2654 fname->crypto_buf.name = NULL;
2655 fname->usr_fname = NULL;
2656 fname->disk_name.name = NULL;
2657
2658 #ifdef CONFIG_UNICODE
2659 kfree(fname->cf_name.name);
2660 fname->cf_name.name = NULL;
2661 #endif
2662 }
2663 #else /* !CONFIG_FS_ENCRYPTION */
ext4_fname_setup_filename(struct inode * dir,const struct qstr * iname,int lookup,struct ext4_filename * fname)2664 static inline int ext4_fname_setup_filename(struct inode *dir,
2665 const struct qstr *iname,
2666 int lookup,
2667 struct ext4_filename *fname)
2668 {
2669 fname->usr_fname = iname;
2670 fname->disk_name.name = (unsigned char *) iname->name;
2671 fname->disk_name.len = iname->len;
2672
2673 #ifdef CONFIG_UNICODE
2674 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2675 #endif
2676
2677 return 0;
2678 }
2679
ext4_fname_prepare_lookup(struct inode * dir,struct dentry * dentry,struct ext4_filename * fname)2680 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2681 struct dentry *dentry,
2682 struct ext4_filename *fname)
2683 {
2684 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2685 }
2686
ext4_fname_free_filename(struct ext4_filename * fname)2687 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2688 {
2689 #ifdef CONFIG_UNICODE
2690 kfree(fname->cf_name.name);
2691 fname->cf_name.name = NULL;
2692 #endif
2693 }
2694 #endif /* !CONFIG_FS_ENCRYPTION */
2695
2696 /* dir.c */
2697 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2698 struct file *,
2699 struct ext4_dir_entry_2 *,
2700 struct buffer_head *, char *, int,
2701 unsigned int);
2702 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2703 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2704 (de), (bh), (buf), (size), (offset)))
2705 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2706 __u32 minor_hash,
2707 struct ext4_dir_entry_2 *dirent,
2708 struct fscrypt_str *ent_name);
2709 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2710 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2711 struct buffer_head *bh,
2712 void *buf, int buf_size,
2713 struct ext4_filename *fname,
2714 struct ext4_dir_entry_2 **dest_de);
2715 void ext4_insert_dentry(struct inode *inode,
2716 struct ext4_dir_entry_2 *de,
2717 int buf_size,
2718 struct ext4_filename *fname);
ext4_update_dx_flag(struct inode * inode)2719 static inline void ext4_update_dx_flag(struct inode *inode)
2720 {
2721 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2722 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2723 /* ext4_iget() should have caught this... */
2724 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2725 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2726 }
2727 }
2728 static const unsigned char ext4_filetype_table[] = {
2729 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2730 };
2731
get_dtype(struct super_block * sb,int filetype)2732 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2733 {
2734 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2735 return DT_UNKNOWN;
2736
2737 return ext4_filetype_table[filetype];
2738 }
2739 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2740 void *buf, int buf_size);
2741
2742 /* fsync.c */
2743 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2744
2745 /* hash.c */
2746 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2747 struct dx_hash_info *hinfo);
2748
2749 /* ialloc.c */
2750 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2751 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2752 const struct qstr *qstr, __u32 goal,
2753 uid_t *owner, __u32 i_flags,
2754 int handle_type, unsigned int line_no,
2755 int nblocks);
2756
2757 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2758 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2759 i_flags, 0, 0, 0)
2760 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2761 type, nblocks) \
2762 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2763 0, (type), __LINE__, (nblocks))
2764
2765
2766 extern void ext4_free_inode(handle_t *, struct inode *);
2767 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2768 extern unsigned long ext4_count_free_inodes(struct super_block *);
2769 extern unsigned long ext4_count_dirs(struct super_block *);
2770 extern void ext4_check_inodes_bitmap(struct super_block *);
2771 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2772 extern int ext4_init_inode_table(struct super_block *sb,
2773 ext4_group_t group, int barrier);
2774 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2775
2776 /* fast_commit.c */
2777 int ext4_fc_info_show(struct seq_file *seq, void *v);
2778 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2779 void ext4_fc_init_inode(struct inode *inode);
2780 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2781 ext4_lblk_t end);
2782 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2783 struct dentry *dentry);
2784 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2785 struct dentry *dentry);
2786 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2787 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2788 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2789 struct dentry *dentry);
2790 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2791 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2792 void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2793 void ext4_fc_start_ineligible(struct super_block *sb, int reason);
2794 void ext4_fc_stop_ineligible(struct super_block *sb);
2795 void ext4_fc_start_update(struct inode *inode);
2796 void ext4_fc_stop_update(struct inode *inode);
2797 void ext4_fc_del(struct inode *inode);
2798 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2799 void ext4_fc_replay_cleanup(struct super_block *sb);
2800 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2801 int __init ext4_fc_init_dentry_cache(void);
2802 void ext4_fc_destroy_dentry_cache(void);
2803 int ext4_fc_record_regions(struct super_block *sb, int ino,
2804 ext4_lblk_t lblk, ext4_fsblk_t pblk,
2805 int len, int replay);
2806
2807 /* mballoc.c */
2808 extern const struct seq_operations ext4_mb_seq_groups_ops;
2809 extern long ext4_mb_stats;
2810 extern long ext4_mb_max_to_scan;
2811 extern int ext4_mb_init(struct super_block *);
2812 extern int ext4_mb_release(struct super_block *);
2813 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2814 struct ext4_allocation_request *, int *);
2815 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2816 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2817 extern int __init ext4_init_mballoc(void);
2818 extern void ext4_exit_mballoc(void);
2819 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2820 ext4_group_t group,
2821 unsigned int nr, int *cnt);
2822 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2823 unsigned int nr);
2824
2825 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2826 struct buffer_head *bh, ext4_fsblk_t block,
2827 unsigned long count, int flags);
2828 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2829 ext4_group_t ngroups);
2830 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2831 ext4_group_t i, struct ext4_group_desc *desc);
2832 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2833 ext4_fsblk_t block, unsigned long count);
2834 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2835 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2836 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2837 int len, int state);
2838
2839 /* inode.c */
2840 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2841 struct ext4_inode_info *ei);
2842 int ext4_inode_is_fast_symlink(struct inode *inode);
2843 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2844 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2845 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2846 bool wait, struct buffer_head **bhs);
2847 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2848 struct buffer_head *bh_result, int create);
2849 int ext4_get_block(struct inode *inode, sector_t iblock,
2850 struct buffer_head *bh_result, int create);
2851 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2852 struct buffer_head *bh, int create);
2853 int ext4_walk_page_buffers(handle_t *handle,
2854 struct buffer_head *head,
2855 unsigned from,
2856 unsigned to,
2857 int *partial,
2858 int (*fn)(handle_t *handle,
2859 struct buffer_head *bh));
2860 int do_journal_get_write_access(handle_t *handle,
2861 struct buffer_head *bh);
2862 #define FALL_BACK_TO_NONDELALLOC 1
2863 #define CONVERT_INLINE_DATA 2
2864
2865 typedef enum {
2866 EXT4_IGET_NORMAL = 0,
2867 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2868 EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */
2869 EXT4_IGET_BAD = 0x0004 /* Allow to iget a bad inode */
2870 } ext4_iget_flags;
2871
2872 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2873 ext4_iget_flags flags, const char *function,
2874 unsigned int line);
2875
2876 #define ext4_iget(sb, ino, flags) \
2877 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2878
2879 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2880 extern int ext4_setattr(struct dentry *, struct iattr *);
2881 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2882 extern void ext4_evict_inode(struct inode *);
2883 extern void ext4_clear_inode(struct inode *);
2884 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2885 extern int ext4_sync_inode(handle_t *, struct inode *);
2886 extern void ext4_dirty_inode(struct inode *, int);
2887 extern int ext4_change_inode_journal_flag(struct inode *, int);
2888 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2889 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2890 struct ext4_iloc *iloc);
2891 extern int ext4_inode_attach_jinode(struct inode *inode);
2892 extern int ext4_can_truncate(struct inode *inode);
2893 extern int ext4_truncate(struct inode *);
2894 extern int ext4_break_layouts(struct inode *);
2895 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2896 extern void ext4_set_inode_flags(struct inode *, bool init);
2897 extern int ext4_alloc_da_blocks(struct inode *inode);
2898 extern void ext4_set_aops(struct inode *inode);
2899 extern int ext4_writepage_trans_blocks(struct inode *);
2900 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2901 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2902 loff_t lstart, loff_t lend);
2903 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2904 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2905 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2906 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2907 extern void ext4_da_release_space(struct inode *inode, int to_free);
2908 extern void ext4_da_update_reserve_space(struct inode *inode,
2909 int used, int quota_claim);
2910 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2911 ext4_fsblk_t pblk, ext4_lblk_t len);
2912
2913 /* indirect.c */
2914 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2915 struct ext4_map_blocks *map, int flags);
2916 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2917 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2918 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2919 ext4_lblk_t start, ext4_lblk_t end);
2920
2921 /* ioctl.c */
2922 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2923 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2924 extern void ext4_reset_inode_seed(struct inode *inode);
2925
2926 /* migrate.c */
2927 extern int ext4_ext_migrate(struct inode *);
2928 extern int ext4_ind_migrate(struct inode *inode);
2929
2930 /* namei.c */
2931 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
2932 struct inode *inode);
2933 extern int ext4_dirblock_csum_verify(struct inode *inode,
2934 struct buffer_head *bh);
2935 extern int ext4_orphan_add(handle_t *, struct inode *);
2936 extern int ext4_orphan_del(handle_t *, struct inode *);
2937 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2938 __u32 start_minor_hash, __u32 *next_hash);
2939 extern int ext4_search_dir(struct buffer_head *bh,
2940 char *search_buf,
2941 int buf_size,
2942 struct inode *dir,
2943 struct ext4_filename *fname,
2944 unsigned int offset,
2945 struct ext4_dir_entry_2 **res_dir);
2946 extern int ext4_generic_delete_entry(struct inode *dir,
2947 struct ext4_dir_entry_2 *de_del,
2948 struct buffer_head *bh,
2949 void *entry_buf,
2950 int buf_size,
2951 int csum_size);
2952 extern bool ext4_empty_dir(struct inode *inode);
2953
2954 /* resize.c */
2955 extern void ext4_kvfree_array_rcu(void *to_free);
2956 extern int ext4_group_add(struct super_block *sb,
2957 struct ext4_new_group_data *input);
2958 extern int ext4_group_extend(struct super_block *sb,
2959 struct ext4_super_block *es,
2960 ext4_fsblk_t n_blocks_count);
2961 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2962
2963 /* super.c */
2964 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2965 sector_t block, int op_flags);
2966 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
2967 sector_t block);
2968 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
2969 bh_end_io_t *end_io);
2970 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
2971 bh_end_io_t *end_io);
2972 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
2973 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
2974 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2975 extern int ext4_calculate_overhead(struct super_block *sb);
2976 extern void ext4_superblock_csum_set(struct super_block *sb);
2977 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2978 ext4_group_t ngroup);
2979 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2980 char nbuf[16]);
2981 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2982 ext4_group_t block_group,
2983 unsigned int flags);
2984
2985 extern __printf(7, 8)
2986 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
2987 int, __u64, const char *, ...);
2988 extern __printf(6, 7)
2989 void __ext4_error_inode(struct inode *, const char *, unsigned int,
2990 ext4_fsblk_t, int, const char *, ...);
2991 extern __printf(5, 6)
2992 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2993 const char *, ...);
2994 extern void __ext4_std_error(struct super_block *, const char *,
2995 unsigned int, int);
2996 extern __printf(4, 5)
2997 void __ext4_warning(struct super_block *, const char *, unsigned int,
2998 const char *, ...);
2999 extern __printf(4, 5)
3000 void __ext4_warning_inode(const struct inode *inode, const char *function,
3001 unsigned int line, const char *fmt, ...);
3002 extern __printf(3, 4)
3003 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3004 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3005 const char *, unsigned int, const char *);
3006 extern __printf(7, 8)
3007 void __ext4_grp_locked_error(const char *, unsigned int,
3008 struct super_block *, ext4_group_t,
3009 unsigned long, ext4_fsblk_t,
3010 const char *, ...);
3011
3012 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3013 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3014
3015 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3016 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3017
3018 #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3019 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3020 (fmt), ## a)
3021
3022 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3023 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3024
3025 #define ext4_abort(sb, err, fmt, a...) \
3026 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3027
3028 #ifdef CONFIG_PRINTK
3029
3030 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3031 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3032 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3033 __ext4_error_inode((inode), (func), (line), (block), \
3034 (err), (fmt), ##__VA_ARGS__)
3035 #define ext4_error_file(file, func, line, block, fmt, ...) \
3036 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3037 #define ext4_error(sb, fmt, ...) \
3038 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3039 ##__VA_ARGS__)
3040 #define ext4_error_err(sb, err, fmt, ...) \
3041 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3042 ##__VA_ARGS__)
3043 #define ext4_warning(sb, fmt, ...) \
3044 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3045 #define ext4_warning_inode(inode, fmt, ...) \
3046 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3047 #define ext4_msg(sb, level, fmt, ...) \
3048 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3049 #define dump_mmp_msg(sb, mmp, msg) \
3050 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3051 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3052 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3053 fmt, ##__VA_ARGS__)
3054
3055 #else
3056
3057 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3058 do { \
3059 no_printk(fmt, ##__VA_ARGS__); \
3060 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3061 } while (0)
3062 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3063 do { \
3064 no_printk(fmt, ##__VA_ARGS__); \
3065 __ext4_error_inode(inode, "", 0, block, err, " "); \
3066 } while (0)
3067 #define ext4_error_file(file, func, line, block, fmt, ...) \
3068 do { \
3069 no_printk(fmt, ##__VA_ARGS__); \
3070 __ext4_error_file(file, "", 0, block, " "); \
3071 } while (0)
3072 #define ext4_error(sb, fmt, ...) \
3073 do { \
3074 no_printk(fmt, ##__VA_ARGS__); \
3075 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3076 } while (0)
3077 #define ext4_error_err(sb, err, fmt, ...) \
3078 do { \
3079 no_printk(fmt, ##__VA_ARGS__); \
3080 __ext4_error(sb, "", 0, false, err, 0, " "); \
3081 } while (0)
3082 #define ext4_warning(sb, fmt, ...) \
3083 do { \
3084 no_printk(fmt, ##__VA_ARGS__); \
3085 __ext4_warning(sb, "", 0, " "); \
3086 } while (0)
3087 #define ext4_warning_inode(inode, fmt, ...) \
3088 do { \
3089 no_printk(fmt, ##__VA_ARGS__); \
3090 __ext4_warning_inode(inode, "", 0, " "); \
3091 } while (0)
3092 #define ext4_msg(sb, level, fmt, ...) \
3093 do { \
3094 no_printk(fmt, ##__VA_ARGS__); \
3095 __ext4_msg(sb, "", " "); \
3096 } while (0)
3097 #define dump_mmp_msg(sb, mmp, msg) \
3098 __dump_mmp_msg(sb, mmp, "", 0, "")
3099 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3100 do { \
3101 no_printk(fmt, ##__VA_ARGS__); \
3102 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3103 } while (0)
3104
3105 #endif
3106
3107 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3108 struct ext4_group_desc *bg);
3109 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3110 struct ext4_group_desc *bg);
3111 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3112 struct ext4_group_desc *bg);
3113 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3114 struct ext4_group_desc *bg);
3115 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3116 struct ext4_group_desc *bg);
3117 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3118 struct ext4_group_desc *bg);
3119 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3120 struct ext4_group_desc *bg);
3121 extern void ext4_block_bitmap_set(struct super_block *sb,
3122 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3123 extern void ext4_inode_bitmap_set(struct super_block *sb,
3124 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3125 extern void ext4_inode_table_set(struct super_block *sb,
3126 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3127 extern void ext4_free_group_clusters_set(struct super_block *sb,
3128 struct ext4_group_desc *bg,
3129 __u32 count);
3130 extern void ext4_free_inodes_set(struct super_block *sb,
3131 struct ext4_group_desc *bg, __u32 count);
3132 extern void ext4_used_dirs_set(struct super_block *sb,
3133 struct ext4_group_desc *bg, __u32 count);
3134 extern void ext4_itable_unused_set(struct super_block *sb,
3135 struct ext4_group_desc *bg, __u32 count);
3136 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3137 struct ext4_group_desc *gdp);
3138 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3139 struct ext4_group_desc *gdp);
3140 extern int ext4_register_li_request(struct super_block *sb,
3141 ext4_group_t first_not_zeroed);
3142
ext4_has_metadata_csum(struct super_block * sb)3143 static inline int ext4_has_metadata_csum(struct super_block *sb)
3144 {
3145 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3146 !EXT4_SB(sb)->s_chksum_driver);
3147
3148 return ext4_has_feature_metadata_csum(sb) &&
3149 (EXT4_SB(sb)->s_chksum_driver != NULL);
3150 }
3151
ext4_has_group_desc_csum(struct super_block * sb)3152 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3153 {
3154 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3155 }
3156
3157 #define ext4_read_incompat_64bit_val(es, name) \
3158 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3159 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3160 le32_to_cpu(es->name##_lo))
3161
ext4_blocks_count(struct ext4_super_block * es)3162 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3163 {
3164 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3165 }
3166
ext4_r_blocks_count(struct ext4_super_block * es)3167 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3168 {
3169 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3170 }
3171
ext4_free_blocks_count(struct ext4_super_block * es)3172 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3173 {
3174 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3175 }
3176
ext4_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3177 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3178 ext4_fsblk_t blk)
3179 {
3180 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3181 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3182 }
3183
ext4_free_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3184 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3185 ext4_fsblk_t blk)
3186 {
3187 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3188 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3189 }
3190
ext4_r_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)3191 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3192 ext4_fsblk_t blk)
3193 {
3194 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3195 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3196 }
3197
ext4_isize(struct super_block * sb,struct ext4_inode * raw_inode)3198 static inline loff_t ext4_isize(struct super_block *sb,
3199 struct ext4_inode *raw_inode)
3200 {
3201 if (ext4_has_feature_largedir(sb) ||
3202 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3203 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3204 le32_to_cpu(raw_inode->i_size_lo);
3205
3206 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3207 }
3208
ext4_isize_set(struct ext4_inode * raw_inode,loff_t i_size)3209 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3210 {
3211 raw_inode->i_size_lo = cpu_to_le32(i_size);
3212 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3213 }
3214
3215 /*
3216 * Reading s_groups_count requires using smp_rmb() afterwards. See
3217 * the locking protocol documented in the comments of ext4_group_add()
3218 * in resize.c
3219 */
ext4_get_groups_count(struct super_block * sb)3220 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3221 {
3222 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3223
3224 smp_rmb();
3225 return ngroups;
3226 }
3227
ext4_flex_group(struct ext4_sb_info * sbi,ext4_group_t block_group)3228 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3229 ext4_group_t block_group)
3230 {
3231 return block_group >> sbi->s_log_groups_per_flex;
3232 }
3233
ext4_flex_bg_size(struct ext4_sb_info * sbi)3234 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3235 {
3236 return 1 << sbi->s_log_groups_per_flex;
3237 }
3238
3239 #define ext4_std_error(sb, errno) \
3240 do { \
3241 if ((errno)) \
3242 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3243 } while (0)
3244
3245 #ifdef CONFIG_SMP
3246 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3247 * counters. So we need to make sure we have free clusters more
3248 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3249 */
3250 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3251 #else
3252 #define EXT4_FREECLUSTERS_WATERMARK 0
3253 #endif
3254
3255 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
ext4_update_i_disksize(struct inode * inode,loff_t newsize)3256 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3257 {
3258 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3259 !inode_is_locked(inode));
3260 down_write(&EXT4_I(inode)->i_data_sem);
3261 if (newsize > EXT4_I(inode)->i_disksize)
3262 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3263 up_write(&EXT4_I(inode)->i_data_sem);
3264 }
3265
3266 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
ext4_update_inode_size(struct inode * inode,loff_t newsize)3267 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3268 {
3269 int changed = 0;
3270
3271 if (newsize > inode->i_size) {
3272 i_size_write(inode, newsize);
3273 changed = 1;
3274 }
3275 if (newsize > EXT4_I(inode)->i_disksize) {
3276 ext4_update_i_disksize(inode, newsize);
3277 changed |= 2;
3278 }
3279 return changed;
3280 }
3281
3282 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3283 loff_t len);
3284
3285 struct ext4_group_info {
3286 unsigned long bb_state;
3287 #ifdef AGGRESSIVE_CHECK
3288 unsigned long bb_check_counter;
3289 #endif
3290 struct rb_root bb_free_root;
3291 ext4_grpblk_t bb_first_free; /* first free block */
3292 ext4_grpblk_t bb_free; /* total free blocks */
3293 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3294 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3295 struct list_head bb_prealloc_list;
3296 #ifdef DOUBLE_CHECK
3297 void *bb_bitmap;
3298 #endif
3299 struct rw_semaphore alloc_sem;
3300 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3301 * regions, index is order.
3302 * bb_counters[3] = 5 means
3303 * 5 free 8-block regions. */
3304 };
3305
3306 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3307 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3308 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3309 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3310 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3311 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3312 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3313 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3314 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3315
3316 #define EXT4_MB_GRP_NEED_INIT(grp) \
3317 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3318 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3319 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3320 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3321 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3322
3323 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3324 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3325 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3326 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3327 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3328 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3329 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3330 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3331
3332 #define EXT4_MAX_CONTENTION 8
3333 #define EXT4_CONTENTION_THRESHOLD 2
3334
ext4_group_lock_ptr(struct super_block * sb,ext4_group_t group)3335 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3336 ext4_group_t group)
3337 {
3338 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3339 }
3340
3341 /*
3342 * Returns true if the filesystem is busy enough that attempts to
3343 * access the block group locks has run into contention.
3344 */
ext4_fs_is_busy(struct ext4_sb_info * sbi)3345 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3346 {
3347 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3348 }
3349
ext4_lock_group(struct super_block * sb,ext4_group_t group)3350 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3351 {
3352 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3353 if (spin_trylock(lock))
3354 /*
3355 * We're able to grab the lock right away, so drop the
3356 * lock contention counter.
3357 */
3358 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3359 else {
3360 /*
3361 * The lock is busy, so bump the contention counter,
3362 * and then wait on the spin lock.
3363 */
3364 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3365 EXT4_MAX_CONTENTION);
3366 spin_lock(lock);
3367 }
3368 }
3369
ext4_unlock_group(struct super_block * sb,ext4_group_t group)3370 static inline void ext4_unlock_group(struct super_block *sb,
3371 ext4_group_t group)
3372 {
3373 spin_unlock(ext4_group_lock_ptr(sb, group));
3374 }
3375
3376 /*
3377 * Block validity checking
3378 */
3379 #define ext4_check_indirect_blockref(inode, bh) \
3380 ext4_check_blockref(__func__, __LINE__, inode, \
3381 (__le32 *)(bh)->b_data, \
3382 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3383
3384 #define ext4_ind_check_inode(inode) \
3385 ext4_check_blockref(__func__, __LINE__, inode, \
3386 EXT4_I(inode)->i_data, \
3387 EXT4_NDIR_BLOCKS)
3388
3389 /*
3390 * Inodes and files operations
3391 */
3392
3393 /* dir.c */
3394 extern const struct file_operations ext4_dir_operations;
3395
3396 #ifdef CONFIG_UNICODE
3397 extern const struct dentry_operations ext4_dentry_ops;
3398 #endif
3399
3400 /* file.c */
3401 extern const struct inode_operations ext4_file_inode_operations;
3402 extern const struct file_operations ext4_file_operations;
3403 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3404
3405 /* inline.c */
3406 extern int ext4_get_max_inline_size(struct inode *inode);
3407 extern int ext4_find_inline_data_nolock(struct inode *inode);
3408 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3409 unsigned int len);
3410 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3411
3412 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3413 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3414 struct inode *inode,
3415 loff_t pos, unsigned len,
3416 unsigned flags,
3417 struct page **pagep);
3418 extern int ext4_write_inline_data_end(struct inode *inode,
3419 loff_t pos, unsigned len,
3420 unsigned copied,
3421 struct page *page);
3422 extern struct buffer_head *
3423 ext4_journalled_write_inline_data(struct inode *inode,
3424 unsigned len,
3425 struct page *page);
3426 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3427 struct inode *inode,
3428 loff_t pos, unsigned len,
3429 unsigned flags,
3430 struct page **pagep,
3431 void **fsdata);
3432 extern int ext4_try_add_inline_entry(handle_t *handle,
3433 struct ext4_filename *fname,
3434 struct inode *dir, struct inode *inode);
3435 extern int ext4_try_create_inline_dir(handle_t *handle,
3436 struct inode *parent,
3437 struct inode *inode);
3438 extern int ext4_read_inline_dir(struct file *filp,
3439 struct dir_context *ctx,
3440 int *has_inline_data);
3441 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3442 struct inode *dir, ext4_lblk_t block,
3443 struct dx_hash_info *hinfo,
3444 __u32 start_hash, __u32 start_minor_hash,
3445 int *has_inline_data);
3446 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3447 struct ext4_filename *fname,
3448 struct ext4_dir_entry_2 **res_dir,
3449 int *has_inline_data);
3450 extern int ext4_delete_inline_entry(handle_t *handle,
3451 struct inode *dir,
3452 struct ext4_dir_entry_2 *de_del,
3453 struct buffer_head *bh,
3454 int *has_inline_data);
3455 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3456 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3457 struct ext4_dir_entry_2 **parent_de,
3458 int *retval);
3459 extern int ext4_inline_data_fiemap(struct inode *inode,
3460 struct fiemap_extent_info *fieinfo,
3461 int *has_inline, __u64 start, __u64 len);
3462
3463 struct iomap;
3464 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3465
3466 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3467
3468 extern int ext4_convert_inline_data(struct inode *inode);
3469
ext4_has_inline_data(struct inode * inode)3470 static inline int ext4_has_inline_data(struct inode *inode)
3471 {
3472 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3473 EXT4_I(inode)->i_inline_off;
3474 }
3475
3476 /* namei.c */
3477 extern const struct inode_operations ext4_dir_inode_operations;
3478 extern const struct inode_operations ext4_special_inode_operations;
3479 extern struct dentry *ext4_get_parent(struct dentry *child);
3480 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3481 struct ext4_dir_entry_2 *de,
3482 int blocksize, int csum_size,
3483 unsigned int parent_ino, int dotdot_real_len);
3484 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3485 unsigned int blocksize);
3486 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3487 struct buffer_head *bh);
3488 extern int ext4_ci_compare(const struct inode *parent,
3489 const struct qstr *fname,
3490 const struct qstr *entry, bool quick);
3491 extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3492 struct inode *inode, struct dentry *dentry);
3493 extern int __ext4_link(struct inode *dir, struct inode *inode,
3494 struct dentry *dentry);
3495
3496 #define S_SHIFT 12
3497 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3498 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3499 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3500 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3501 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3502 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3503 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3504 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3505 };
3506
ext4_set_de_type(struct super_block * sb,struct ext4_dir_entry_2 * de,umode_t mode)3507 static inline void ext4_set_de_type(struct super_block *sb,
3508 struct ext4_dir_entry_2 *de,
3509 umode_t mode) {
3510 if (ext4_has_feature_filetype(sb))
3511 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3512 }
3513
3514 /* readpages.c */
3515 extern int ext4_mpage_readpages(struct inode *inode,
3516 struct readahead_control *rac, struct page *page);
3517 extern int __init ext4_init_post_read_processing(void);
3518 extern void ext4_exit_post_read_processing(void);
3519
3520 /* symlink.c */
3521 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3522 extern const struct inode_operations ext4_symlink_inode_operations;
3523 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3524
3525 /* sysfs.c */
3526 extern int ext4_register_sysfs(struct super_block *sb);
3527 extern void ext4_unregister_sysfs(struct super_block *sb);
3528 extern int __init ext4_init_sysfs(void);
3529 extern void ext4_exit_sysfs(void);
3530
3531 /* block_validity */
3532 extern void ext4_release_system_zone(struct super_block *sb);
3533 extern int ext4_setup_system_zone(struct super_block *sb);
3534 extern int __init ext4_init_system_zone(void);
3535 extern void ext4_exit_system_zone(void);
3536 extern int ext4_inode_block_valid(struct inode *inode,
3537 ext4_fsblk_t start_blk,
3538 unsigned int count);
3539 extern int ext4_check_blockref(const char *, unsigned int,
3540 struct inode *, __le32 *, unsigned int);
3541
3542 /* extents.c */
3543 struct ext4_ext_path;
3544 struct ext4_extent;
3545
3546 /*
3547 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3548 * __le32.
3549 */
3550 #define EXT_MAX_BLOCKS 0xffffffff
3551
3552 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3553 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3554 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3555 struct ext4_map_blocks *map, int flags);
3556 extern int ext4_ext_truncate(handle_t *, struct inode *);
3557 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3558 ext4_lblk_t end);
3559 extern void ext4_ext_init(struct super_block *);
3560 extern void ext4_ext_release(struct super_block *);
3561 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3562 loff_t len);
3563 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3564 loff_t offset, ssize_t len);
3565 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3566 ext4_io_end_t *io_end);
3567 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3568 struct ext4_map_blocks *map, int flags);
3569 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3570 int num,
3571 struct ext4_ext_path *path);
3572 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3573 struct ext4_ext_path **,
3574 struct ext4_extent *, int);
3575 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3576 struct ext4_ext_path **,
3577 int flags);
3578 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3579 extern int ext4_ext_check_inode(struct inode *inode);
3580 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3581 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3582 __u64 start, __u64 len);
3583 extern int ext4_get_es_cache(struct inode *inode,
3584 struct fiemap_extent_info *fieinfo,
3585 __u64 start, __u64 len);
3586 extern int ext4_ext_precache(struct inode *inode);
3587 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3588 struct inode *inode2, ext4_lblk_t lblk1,
3589 ext4_lblk_t lblk2, ext4_lblk_t count,
3590 int mark_unwritten,int *err);
3591 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3592 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3593 int check_cred, int restart_cred,
3594 int revoke_cred);
3595 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3596 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3597 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3598 int len, int unwritten, ext4_fsblk_t pblk);
3599 extern int ext4_ext_clear_bb(struct inode *inode);
3600
3601
3602 /* move_extent.c */
3603 extern void ext4_double_down_write_data_sem(struct inode *first,
3604 struct inode *second);
3605 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3606 struct inode *donor_inode);
3607 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3608 __u64 start_orig, __u64 start_donor,
3609 __u64 len, __u64 *moved_len);
3610
3611 /* page-io.c */
3612 extern int __init ext4_init_pageio(void);
3613 extern void ext4_exit_pageio(void);
3614 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3615 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3616 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3617 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3618 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3619 struct writeback_control *wbc);
3620 extern void ext4_end_io_rsv_work(struct work_struct *work);
3621 extern void ext4_io_submit(struct ext4_io_submit *io);
3622 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3623 struct page *page,
3624 int len,
3625 struct writeback_control *wbc,
3626 bool keep_towrite);
3627 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3628 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3629
3630 /* mmp.c */
3631 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3632
3633 /* mmp.c */
3634 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3635
3636 /* verity.c */
3637 extern const struct fsverity_operations ext4_verityops;
3638
3639 /*
3640 * Add new method to test whether block and inode bitmaps are properly
3641 * initialized. With uninit_bg reading the block from disk is not enough
3642 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3643 */
3644 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3645
bitmap_uptodate(struct buffer_head * bh)3646 static inline int bitmap_uptodate(struct buffer_head *bh)
3647 {
3648 return (buffer_uptodate(bh) &&
3649 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3650 }
set_bitmap_uptodate(struct buffer_head * bh)3651 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3652 {
3653 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3654 }
3655
3656 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3657
3658 /* For ioend & aio unwritten conversion wait queues */
3659 #define EXT4_WQ_HASH_SZ 37
3660 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3661 EXT4_WQ_HASH_SZ])
3662 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3663
3664 extern int ext4_resize_begin(struct super_block *sb);
3665 extern void ext4_resize_end(struct super_block *sb);
3666
ext4_set_io_unwritten_flag(struct inode * inode,struct ext4_io_end * io_end)3667 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3668 struct ext4_io_end *io_end)
3669 {
3670 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3671 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3672 atomic_inc(&EXT4_I(inode)->i_unwritten);
3673 }
3674 }
3675
ext4_clear_io_unwritten_flag(ext4_io_end_t * io_end)3676 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3677 {
3678 struct inode *inode = io_end->inode;
3679
3680 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3681 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3682 /* Wake up anyone waiting on unwritten extent conversion */
3683 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3684 wake_up_all(ext4_ioend_wq(inode));
3685 }
3686 }
3687
3688 extern const struct iomap_ops ext4_iomap_ops;
3689 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3690 extern const struct iomap_ops ext4_iomap_report_ops;
3691
ext4_buffer_uptodate(struct buffer_head * bh)3692 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3693 {
3694 /*
3695 * If the buffer has the write error flag, we have failed
3696 * to write out data in the block. In this case, we don't
3697 * have to read the block because we may read the old data
3698 * successfully.
3699 */
3700 if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3701 set_buffer_uptodate(bh);
3702 return buffer_uptodate(bh);
3703 }
3704
3705 #endif /* __KERNEL__ */
3706
3707 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3708 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3709
3710 #endif /* _EXT4_H */
3711