Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * ext4.h
4 : *
5 : * Copyright (C) 1992, 1993, 1994, 1995
6 : * Remy Card (card@masi.ibp.fr)
7 : * Laboratoire MASI - Institut Blaise Pascal
8 : * Universite Pierre et Marie Curie (Paris VI)
9 : *
10 : * from
11 : *
12 : * linux/include/linux/minix_fs.h
13 : *
14 : * Copyright (C) 1991, 1992 Linus Torvalds
15 : */
16 :
17 : #ifndef _EXT4_H
18 : #define _EXT4_H
19 :
20 : #include <linux/refcount.h>
21 : #include <linux/types.h>
22 : #include <linux/blkdev.h>
23 : #include <linux/magic.h>
24 : #include <linux/jbd2.h>
25 : #include <linux/quota.h>
26 : #include <linux/rwsem.h>
27 : #include <linux/rbtree.h>
28 : #include <linux/seqlock.h>
29 : #include <linux/mutex.h>
30 : #include <linux/timer.h>
31 : #include <linux/wait.h>
32 : #include <linux/sched/signal.h>
33 : #include <linux/blockgroup_lock.h>
34 : #include <linux/percpu_counter.h>
35 : #include <linux/ratelimit.h>
36 : #include <crypto/hash.h>
37 : #include <linux/falloc.h>
38 : #include <linux/percpu-rwsem.h>
39 : #include <linux/fiemap.h>
40 : #ifdef __KERNEL__
41 : #include <linux/compat.h>
42 : #endif
43 : #include <uapi/linux/ext4.h>
44 :
45 : #include <linux/fscrypt.h>
46 : #include <linux/fsverity.h>
47 :
48 : #include <linux/compiler.h>
49 :
50 : /*
51 : * The fourth extended filesystem constants/structures
52 : */
53 :
54 : /*
55 : * with AGGRESSIVE_CHECK allocator runs consistency checks over
56 : * structures. these checks slow things down a lot
57 : */
58 : #define AGGRESSIVE_CHECK__
59 :
60 : /*
61 : * with DOUBLE_CHECK defined mballoc creates persistent in-core
62 : * bitmaps, maintains and uses them to check for double allocations
63 : */
64 : #define DOUBLE_CHECK__
65 :
66 : /*
67 : * Define EXT4FS_DEBUG to produce debug messages
68 : */
69 : #undef EXT4FS_DEBUG
70 :
71 : /*
72 : * Debug code
73 : */
74 : #ifdef EXT4FS_DEBUG
75 : #define ext4_debug(f, a...) \
76 : do { \
77 : printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
78 : __FILE__, __LINE__, __func__); \
79 : printk(KERN_DEBUG f, ## a); \
80 : } while (0)
81 : #else
82 : #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
83 : #endif
84 :
85 : /*
86 : * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
87 : */
88 : #define EXT_DEBUG__
89 :
90 : /*
91 : * Dynamic printk for controlled extents debugging.
92 : */
93 : #ifdef CONFIG_EXT4_DEBUG
94 : #define ext_debug(ino, fmt, ...) \
95 : pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
96 : current->comm, task_pid_nr(current), \
97 : ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
98 : __func__, ##__VA_ARGS__)
99 : #else
100 : #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
101 : #endif
102 :
103 : #define ASSERT(assert) \
104 : do { \
105 : if (unlikely(!(assert))) { \
106 : printk(KERN_EMERG \
107 : "Assertion failure in %s() at %s:%d: '%s'\n", \
108 : __func__, __FILE__, __LINE__, #assert); \
109 : BUG(); \
110 : } \
111 : } while (0)
112 :
113 : /* data type for block offset of block group */
114 : typedef int ext4_grpblk_t;
115 :
116 : /* data type for filesystem-wide blocks number */
117 : typedef unsigned long long ext4_fsblk_t;
118 :
119 : /* data type for file logical block number */
120 : typedef __u32 ext4_lblk_t;
121 :
122 : /* data type for block group number */
123 : typedef unsigned int ext4_group_t;
124 :
125 : enum SHIFT_DIRECTION {
126 : SHIFT_LEFT = 0,
127 : SHIFT_RIGHT,
128 : };
129 :
130 : /*
131 : * For each criteria, mballoc has slightly different way of finding
132 : * the required blocks nad usually, higher the criteria the slower the
133 : * allocation. We start at lower criterias and keep falling back to
134 : * higher ones if we are not able to find any blocks. Lower (earlier)
135 : * criteria are faster.
136 : */
137 : enum criteria {
138 : /*
139 : * Used when number of blocks needed is a power of 2. This
140 : * doesn't trigger any disk IO except prefetch and is the
141 : * fastest criteria.
142 : */
143 : CR_POWER2_ALIGNED,
144 :
145 : /*
146 : * Tries to lookup in-memory data structures to find the most
147 : * suitable group that satisfies goal request. No disk IO
148 : * except block prefetch.
149 : */
150 : CR_GOAL_LEN_FAST,
151 :
152 : /*
153 : * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal
154 : * length to the best available length for faster allocation.
155 : */
156 : CR_BEST_AVAIL_LEN,
157 :
158 : /*
159 : * Reads each block group sequentially, performing disk IO if
160 : * necessary, to find find_suitable block group. Tries to
161 : * allocate goal length but might trim the request if nothing
162 : * is found after enough tries.
163 : */
164 : CR_GOAL_LEN_SLOW,
165 :
166 : /*
167 : * Finds the first free set of blocks and allocates
168 : * those. This is only used in rare cases when
169 : * CR_GOAL_LEN_SLOW also fails to allocate anything.
170 : */
171 : CR_ANY_FREE,
172 :
173 : /*
174 : * Number of criterias defined.
175 : */
176 : EXT4_MB_NUM_CRS
177 : };
178 :
179 : /* criteria below which we use fast block scanning and avoid unnecessary IO */
180 : #define CR_FAST CR_GOAL_LEN_SLOW
181 :
182 : /*
183 : * Flags used in mballoc's allocation_context flags field.
184 : *
185 : * Also used to show what's going on for debugging purposes when the
186 : * flag field is exported via the traceport interface
187 : */
188 :
189 : /* prefer goal again. length */
190 : #define EXT4_MB_HINT_MERGE 0x0001
191 : /* blocks already reserved */
192 : #define EXT4_MB_HINT_RESERVED 0x0002
193 : /* metadata is being allocated */
194 : #define EXT4_MB_HINT_METADATA 0x0004
195 : /* first blocks in the file */
196 : #define EXT4_MB_HINT_FIRST 0x0008
197 : /* search for the best chunk */
198 : #define EXT4_MB_HINT_BEST 0x0010
199 : /* data is being allocated */
200 : #define EXT4_MB_HINT_DATA 0x0020
201 : /* don't preallocate (for tails) */
202 : #define EXT4_MB_HINT_NOPREALLOC 0x0040
203 : /* allocate for locality group */
204 : #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
205 : /* allocate goal blocks or none */
206 : #define EXT4_MB_HINT_GOAL_ONLY 0x0100
207 : /* goal is meaningful */
208 : #define EXT4_MB_HINT_TRY_GOAL 0x0200
209 : /* blocks already pre-reserved by delayed allocation */
210 : #define EXT4_MB_DELALLOC_RESERVED 0x0400
211 : /* We are doing stream allocation */
212 : #define EXT4_MB_STREAM_ALLOC 0x0800
213 : /* Use reserved root blocks if needed */
214 : #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
215 : /* Use blocks from reserved pool */
216 : #define EXT4_MB_USE_RESERVED 0x2000
217 : /* Do strict check for free blocks while retrying block allocation */
218 : #define EXT4_MB_STRICT_CHECK 0x4000
219 : /* Large fragment size list lookup succeeded at least once for cr = 0 */
220 : #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED 0x8000
221 : /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
222 : #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED 0x00010000
223 : /* Avg fragment size rb tree lookup succeeded at least once for cr = 1.5 */
224 : #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED 0x00020000
225 :
226 : struct ext4_allocation_request {
227 : /* target inode for block we're allocating */
228 : struct inode *inode;
229 : /* how many blocks we want to allocate */
230 : unsigned int len;
231 : /* logical block in target inode */
232 : ext4_lblk_t logical;
233 : /* the closest logical allocated block to the left */
234 : ext4_lblk_t lleft;
235 : /* the closest logical allocated block to the right */
236 : ext4_lblk_t lright;
237 : /* phys. target (a hint) */
238 : ext4_fsblk_t goal;
239 : /* phys. block for the closest logical allocated block to the left */
240 : ext4_fsblk_t pleft;
241 : /* phys. block for the closest logical allocated block to the right */
242 : ext4_fsblk_t pright;
243 : /* flags. see above EXT4_MB_HINT_* */
244 : unsigned int flags;
245 : };
246 :
247 : /*
248 : * Logical to physical block mapping, used by ext4_map_blocks()
249 : *
250 : * This structure is used to pass requests into ext4_map_blocks() as
251 : * well as to store the information returned by ext4_map_blocks(). It
252 : * takes less room on the stack than a struct buffer_head.
253 : */
254 : #define EXT4_MAP_NEW BIT(BH_New)
255 : #define EXT4_MAP_MAPPED BIT(BH_Mapped)
256 : #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
257 : #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
258 : #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
259 : EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
260 :
261 : struct ext4_map_blocks {
262 : ext4_fsblk_t m_pblk;
263 : ext4_lblk_t m_lblk;
264 : unsigned int m_len;
265 : unsigned int m_flags;
266 : };
267 :
268 : /*
269 : * Block validity checking, system zone rbtree.
270 : */
271 : struct ext4_system_blocks {
272 : struct rb_root root;
273 : struct rcu_head rcu;
274 : };
275 :
276 : /*
277 : * Flags for ext4_io_end->flags
278 : */
279 : #define EXT4_IO_END_UNWRITTEN 0x0001
280 :
281 : struct ext4_io_end_vec {
282 : struct list_head list; /* list of io_end_vec */
283 : loff_t offset; /* offset in the file */
284 : ssize_t size; /* size of the extent */
285 : };
286 :
287 : /*
288 : * For converting unwritten extents on a work queue. 'handle' is used for
289 : * buffered writeback.
290 : */
291 : typedef struct ext4_io_end {
292 : struct list_head list; /* per-file finished IO list */
293 : handle_t *handle; /* handle reserved for extent
294 : * conversion */
295 : struct inode *inode; /* file being written to */
296 : struct bio *bio; /* Linked list of completed
297 : * bios covering the extent */
298 : unsigned int flag; /* unwritten or not */
299 : refcount_t count; /* reference counter */
300 : struct list_head list_vec; /* list of ext4_io_end_vec */
301 : } ext4_io_end_t;
302 :
303 : struct ext4_io_submit {
304 : struct writeback_control *io_wbc;
305 : struct bio *io_bio;
306 : ext4_io_end_t *io_end;
307 : sector_t io_next_block;
308 : };
309 :
310 : /*
311 : * Special inodes numbers
312 : */
313 : #define EXT4_BAD_INO 1 /* Bad blocks inode */
314 : #define EXT4_ROOT_INO 2 /* Root inode */
315 : #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
316 : #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
317 : #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
318 : #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
319 : #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
320 : #define EXT4_JOURNAL_INO 8 /* Journal inode */
321 :
322 : /* First non-reserved inode for old ext4 filesystems */
323 : #define EXT4_GOOD_OLD_FIRST_INO 11
324 :
325 : /*
326 : * Maximal count of links to a file
327 : */
328 : #define EXT4_LINK_MAX 65000
329 :
330 : /*
331 : * Macro-instructions used to manage several block sizes
332 : */
333 : #define EXT4_MIN_BLOCK_SIZE 1024
334 : #define EXT4_MAX_BLOCK_SIZE 65536
335 : #define EXT4_MIN_BLOCK_LOG_SIZE 10
336 : #define EXT4_MAX_BLOCK_LOG_SIZE 16
337 : #define EXT4_MAX_CLUSTER_LOG_SIZE 30
338 : #ifdef __KERNEL__
339 : # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
340 : #else
341 : # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
342 : #endif
343 : #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
344 : #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
345 : EXT4_SB(s)->s_cluster_bits)
346 : #ifdef __KERNEL__
347 : # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
348 : # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
349 : #else
350 : # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
351 : #endif
352 : #ifdef __KERNEL__
353 : #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
354 : #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
355 : #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
356 : #else
357 : #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
358 : EXT4_GOOD_OLD_INODE_SIZE : \
359 : (s)->s_inode_size)
360 : #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
361 : EXT4_GOOD_OLD_FIRST_INO : \
362 : (s)->s_first_ino)
363 : #endif
364 : #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
365 : #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
366 : ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
367 : blkbits))
368 :
369 : /* Translate a block number to a cluster number */
370 : #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
371 : /* Translate a cluster number to a block number */
372 : #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
373 : /* Translate # of blks to # of clusters */
374 : #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
375 : (sbi)->s_cluster_bits)
376 : /* Mask out the low bits to get the starting block of the cluster */
377 : #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
378 : ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
379 : #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
380 : ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
381 : /* Fill in the low bits to get the last block of the cluster */
382 : #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
383 : ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
384 : /* Get the cluster offset */
385 : #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
386 : ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
387 : #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
388 : ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
389 :
390 : /*
391 : * Structure of a blocks group descriptor
392 : */
393 : struct ext4_group_desc
394 : {
395 : __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
396 : __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
397 : __le32 bg_inode_table_lo; /* Inodes table block */
398 : __le16 bg_free_blocks_count_lo;/* Free blocks count */
399 : __le16 bg_free_inodes_count_lo;/* Free inodes count */
400 : __le16 bg_used_dirs_count_lo; /* Directories count */
401 : __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
402 : __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
403 : __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
404 : __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
405 : __le16 bg_itable_unused_lo; /* Unused inodes count */
406 : __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
407 : __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
408 : __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
409 : __le32 bg_inode_table_hi; /* Inodes table block MSB */
410 : __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
411 : __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
412 : __le16 bg_used_dirs_count_hi; /* Directories count MSB */
413 : __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
414 : __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
415 : __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
416 : __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
417 : __u32 bg_reserved;
418 : };
419 :
420 : #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
421 : (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
422 : sizeof(__le16))
423 : #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
424 : (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
425 : sizeof(__le16))
426 :
427 : /*
428 : * Structure of a flex block group info
429 : */
430 :
431 : struct flex_groups {
432 : atomic64_t free_clusters;
433 : atomic_t free_inodes;
434 : atomic_t used_dirs;
435 : };
436 :
437 : #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
438 : #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
439 : #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
440 :
441 : /*
442 : * Macro-instructions used to manage group descriptors
443 : */
444 : #define EXT4_MIN_DESC_SIZE 32
445 : #define EXT4_MIN_DESC_SIZE_64BIT 64
446 : #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
447 : #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
448 : #ifdef __KERNEL__
449 : # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
450 : # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
451 : # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
452 : # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
453 : # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
454 : #else
455 : # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
456 : # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
457 : # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
458 : #endif
459 :
460 : /*
461 : * Constants relative to the data blocks
462 : */
463 : #define EXT4_NDIR_BLOCKS 12
464 : #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
465 : #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
466 : #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
467 : #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
468 :
469 : /*
470 : * Inode flags
471 : */
472 : #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
473 : #define EXT4_UNRM_FL 0x00000002 /* Undelete */
474 : #define EXT4_COMPR_FL 0x00000004 /* Compress file */
475 : #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
476 : #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
477 : #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
478 : #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
479 : #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
480 : /* Reserved for compression usage... */
481 : #define EXT4_DIRTY_FL 0x00000100
482 : #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
483 : #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
484 : /* nb: was previously EXT2_ECOMPR_FL */
485 : #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
486 : /* End compression flags --- maybe not all used */
487 : #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
488 : #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
489 : #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
490 : #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
491 : #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
492 : #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
493 : #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
494 : #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
495 : #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
496 : #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
497 : /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
498 :
499 : #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
500 :
501 : #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
502 : #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
503 : #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
504 : #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
505 :
506 : /* User modifiable flags */
507 : #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
508 : EXT4_UNRM_FL | \
509 : EXT4_COMPR_FL | \
510 : EXT4_SYNC_FL | \
511 : EXT4_IMMUTABLE_FL | \
512 : EXT4_APPEND_FL | \
513 : EXT4_NODUMP_FL | \
514 : EXT4_NOATIME_FL | \
515 : EXT4_JOURNAL_DATA_FL | \
516 : EXT4_NOTAIL_FL | \
517 : EXT4_DIRSYNC_FL | \
518 : EXT4_TOPDIR_FL | \
519 : EXT4_EXTENTS_FL | \
520 : 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
521 : EXT4_DAX_FL | \
522 : EXT4_PROJINHERIT_FL | \
523 : EXT4_CASEFOLD_FL)
524 :
525 : /* User visible flags */
526 : #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
527 : EXT4_DIRTY_FL | \
528 : EXT4_COMPRBLK_FL | \
529 : EXT4_NOCOMPR_FL | \
530 : EXT4_ENCRYPT_FL | \
531 : EXT4_INDEX_FL | \
532 : EXT4_VERITY_FL | \
533 : EXT4_INLINE_DATA_FL)
534 :
535 : /* Flags that should be inherited by new inodes from their parent. */
536 : #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
537 : EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
538 : EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
539 : EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
540 : EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
541 : EXT4_DAX_FL)
542 :
543 : /* Flags that are appropriate for regular files (all but dir-specific ones). */
544 : #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
545 : EXT4_PROJINHERIT_FL))
546 :
547 : /* Flags that are appropriate for non-directories/regular files. */
548 : #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
549 :
550 : /* The only flags that should be swapped */
551 : #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
552 :
553 : /* Flags which are mutually exclusive to DAX */
554 : #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
555 : EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
556 :
557 : /* Mask out flags that are inappropriate for the given type of inode. */
558 : static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
559 : {
560 0 : if (S_ISDIR(mode))
561 : return flags;
562 0 : else if (S_ISREG(mode))
563 0 : return flags & EXT4_REG_FLMASK;
564 : else
565 0 : return flags & EXT4_OTHER_FLMASK;
566 : }
567 :
568 : /*
569 : * Inode flags used for atomic set/get
570 : */
571 : enum {
572 : EXT4_INODE_SECRM = 0, /* Secure deletion */
573 : EXT4_INODE_UNRM = 1, /* Undelete */
574 : EXT4_INODE_COMPR = 2, /* Compress file */
575 : EXT4_INODE_SYNC = 3, /* Synchronous updates */
576 : EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
577 : EXT4_INODE_APPEND = 5, /* writes to file may only append */
578 : EXT4_INODE_NODUMP = 6, /* do not dump file */
579 : EXT4_INODE_NOATIME = 7, /* do not update atime */
580 : /* Reserved for compression usage... */
581 : EXT4_INODE_DIRTY = 8,
582 : EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
583 : EXT4_INODE_NOCOMPR = 10, /* Don't compress */
584 : EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
585 : /* End compression flags --- maybe not all used */
586 : EXT4_INODE_INDEX = 12, /* hash-indexed directory */
587 : EXT4_INODE_IMAGIC = 13, /* AFS directory */
588 : EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
589 : EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
590 : EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
591 : EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
592 : EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
593 : EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
594 : EXT4_INODE_VERITY = 20, /* Verity protected inode */
595 : EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
596 : /* 22 was formerly EXT4_INODE_EOFBLOCKS */
597 : EXT4_INODE_DAX = 25, /* Inode is DAX */
598 : EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
599 : EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
600 : EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
601 : EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
602 : };
603 :
604 : /*
605 : * Since it's pretty easy to mix up bit numbers and hex values, we use a
606 : * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
607 : * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
608 : * any extra space in the compiled kernel image, otherwise, the build will fail.
609 : * It's important that these values are the same, since we are using
610 : * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
611 : * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
612 : * values found in ext2, ext3 and ext4 filesystems, and of course the values
613 : * defined in e2fsprogs.
614 : *
615 : * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
616 : */
617 : #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
618 : #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
619 :
620 : static inline void ext4_check_flag_values(void)
621 : {
622 2 : CHECK_FLAG_VALUE(SECRM);
623 2 : CHECK_FLAG_VALUE(UNRM);
624 2 : CHECK_FLAG_VALUE(COMPR);
625 2 : CHECK_FLAG_VALUE(SYNC);
626 2 : CHECK_FLAG_VALUE(IMMUTABLE);
627 2 : CHECK_FLAG_VALUE(APPEND);
628 2 : CHECK_FLAG_VALUE(NODUMP);
629 2 : CHECK_FLAG_VALUE(NOATIME);
630 2 : CHECK_FLAG_VALUE(DIRTY);
631 2 : CHECK_FLAG_VALUE(COMPRBLK);
632 2 : CHECK_FLAG_VALUE(NOCOMPR);
633 2 : CHECK_FLAG_VALUE(ENCRYPT);
634 2 : CHECK_FLAG_VALUE(INDEX);
635 2 : CHECK_FLAG_VALUE(IMAGIC);
636 2 : CHECK_FLAG_VALUE(JOURNAL_DATA);
637 2 : CHECK_FLAG_VALUE(NOTAIL);
638 2 : CHECK_FLAG_VALUE(DIRSYNC);
639 2 : CHECK_FLAG_VALUE(TOPDIR);
640 2 : CHECK_FLAG_VALUE(HUGE_FILE);
641 2 : CHECK_FLAG_VALUE(EXTENTS);
642 2 : CHECK_FLAG_VALUE(VERITY);
643 2 : CHECK_FLAG_VALUE(EA_INODE);
644 2 : CHECK_FLAG_VALUE(INLINE_DATA);
645 2 : CHECK_FLAG_VALUE(PROJINHERIT);
646 2 : CHECK_FLAG_VALUE(CASEFOLD);
647 2 : CHECK_FLAG_VALUE(RESERVED);
648 : }
649 :
650 : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
651 : struct compat_ext4_new_group_input {
652 : u32 group;
653 : compat_u64 block_bitmap;
654 : compat_u64 inode_bitmap;
655 : compat_u64 inode_table;
656 : u32 blocks_count;
657 : u16 reserved_blocks;
658 : u16 unused;
659 : };
660 : #endif
661 :
662 : /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
663 : struct ext4_new_group_data {
664 : __u32 group;
665 : __u64 block_bitmap;
666 : __u64 inode_bitmap;
667 : __u64 inode_table;
668 : __u32 blocks_count;
669 : __u16 reserved_blocks;
670 : __u16 mdata_blocks;
671 : __u32 free_clusters_count;
672 : };
673 :
674 : /* Indexes used to index group tables in ext4_new_group_data */
675 : enum {
676 : BLOCK_BITMAP = 0, /* block bitmap */
677 : INODE_BITMAP, /* inode bitmap */
678 : INODE_TABLE, /* inode tables */
679 : GROUP_TABLE_COUNT,
680 : };
681 :
682 : /*
683 : * Flags used by ext4_map_blocks()
684 : */
685 : /* Allocate any needed blocks and/or convert an unwritten
686 : extent to be an initialized ext4 */
687 : #define EXT4_GET_BLOCKS_CREATE 0x0001
688 : /* Request the creation of an unwritten extent */
689 : #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
690 : #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
691 : EXT4_GET_BLOCKS_CREATE)
692 : /* Caller is from the delayed allocation writeout path
693 : * finally doing the actual allocation of delayed blocks */
694 : #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
695 : /* caller is from the direct IO path, request to creation of an
696 : unwritten extents if not allocated, split the unwritten
697 : extent if blocks has been preallocated already*/
698 : #define EXT4_GET_BLOCKS_PRE_IO 0x0008
699 : #define EXT4_GET_BLOCKS_CONVERT 0x0010
700 : #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
701 : EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
702 : /* Convert extent to initialized after IO complete */
703 : #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
704 : EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
705 : /* Eventual metadata allocation (due to growing extent tree)
706 : * should not fail, so try to use reserved blocks for that.*/
707 : #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
708 : /* Don't normalize allocation size (used for fallocate) */
709 : #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
710 : /* Convert written extents to unwritten */
711 : #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
712 : /* Write zeros to newly created written extents */
713 : #define EXT4_GET_BLOCKS_ZERO 0x0200
714 : #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
715 : EXT4_GET_BLOCKS_ZERO)
716 : /* Caller will submit data before dropping transaction handle. This
717 : * allows jbd2 to avoid submitting data before commit. */
718 : #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
719 : /* Caller is in the atomic contex, find extent if it has been cached */
720 : #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
721 :
722 : /*
723 : * The bit position of these flags must not overlap with any of the
724 : * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
725 : * read_extent_tree_block(), ext4_split_extent_at(),
726 : * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
727 : * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
728 : * caching the extents when reading from the extent tree while a
729 : * truncate or punch hole operation is in progress.
730 : */
731 : #define EXT4_EX_NOCACHE 0x40000000
732 : #define EXT4_EX_FORCE_CACHE 0x20000000
733 : #define EXT4_EX_NOFAIL 0x10000000
734 :
735 : /*
736 : * Flags used by ext4_free_blocks
737 : */
738 : #define EXT4_FREE_BLOCKS_METADATA 0x0001
739 : #define EXT4_FREE_BLOCKS_FORGET 0x0002
740 : #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
741 : #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
742 : #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
743 : #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
744 : #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
745 :
746 : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
747 : /*
748 : * ioctl commands in 32 bit emulation
749 : */
750 : #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
751 : #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
752 : #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
753 : #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
754 : #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
755 : #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
756 : #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
757 : #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
758 : #endif
759 :
760 : /* Max physical block we can address w/o extents */
761 : #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
762 :
763 : /* Max logical block we can support */
764 : #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
765 :
766 : /*
767 : * Structure of an inode on the disk
768 : */
769 : struct ext4_inode {
770 : __le16 i_mode; /* File mode */
771 : __le16 i_uid; /* Low 16 bits of Owner Uid */
772 : __le32 i_size_lo; /* Size in bytes */
773 : __le32 i_atime; /* Access time */
774 : __le32 i_ctime; /* Inode Change time */
775 : __le32 i_mtime; /* Modification time */
776 : __le32 i_dtime; /* Deletion Time */
777 : __le16 i_gid; /* Low 16 bits of Group Id */
778 : __le16 i_links_count; /* Links count */
779 : __le32 i_blocks_lo; /* Blocks count */
780 : __le32 i_flags; /* File flags */
781 : union {
782 : struct {
783 : __le32 l_i_version;
784 : } linux1;
785 : struct {
786 : __u32 h_i_translator;
787 : } hurd1;
788 : struct {
789 : __u32 m_i_reserved1;
790 : } masix1;
791 : } osd1; /* OS dependent 1 */
792 : __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
793 : __le32 i_generation; /* File version (for NFS) */
794 : __le32 i_file_acl_lo; /* File ACL */
795 : __le32 i_size_high;
796 : __le32 i_obso_faddr; /* Obsoleted fragment address */
797 : union {
798 : struct {
799 : __le16 l_i_blocks_high; /* were l_i_reserved1 */
800 : __le16 l_i_file_acl_high;
801 : __le16 l_i_uid_high; /* these 2 fields */
802 : __le16 l_i_gid_high; /* were reserved2[0] */
803 : __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
804 : __le16 l_i_reserved;
805 : } linux2;
806 : struct {
807 : __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
808 : __u16 h_i_mode_high;
809 : __u16 h_i_uid_high;
810 : __u16 h_i_gid_high;
811 : __u32 h_i_author;
812 : } hurd2;
813 : struct {
814 : __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
815 : __le16 m_i_file_acl_high;
816 : __u32 m_i_reserved2[2];
817 : } masix2;
818 : } osd2; /* OS dependent 2 */
819 : __le16 i_extra_isize;
820 : __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
821 : __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
822 : __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
823 : __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
824 : __le32 i_crtime; /* File Creation time */
825 : __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
826 : __le32 i_version_hi; /* high 32 bits for 64-bit version */
827 : __le32 i_projid; /* Project ID */
828 : };
829 :
830 : #define EXT4_EPOCH_BITS 2
831 : #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
832 : #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
833 :
834 : /*
835 : * Extended fields will fit into an inode if the filesystem was formatted
836 : * with large inodes (-I 256 or larger) and there are not currently any EAs
837 : * consuming all of the available space. For new inodes we always reserve
838 : * enough space for the kernel's known extended fields, but for inodes
839 : * created with an old kernel this might not have been the case. None of
840 : * the extended inode fields is critical for correct filesystem operation.
841 : * This macro checks if a certain field fits in the inode. Note that
842 : * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
843 : */
844 : #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
845 : ((offsetof(typeof(*ext4_inode), field) + \
846 : sizeof((ext4_inode)->field)) \
847 : <= (EXT4_GOOD_OLD_INODE_SIZE + \
848 : (einode)->i_extra_isize)) \
849 :
850 : /*
851 : * We use an encoding that preserves the times for extra epoch "00":
852 : *
853 : * extra msb of adjust for signed
854 : * epoch 32-bit 32-bit tv_sec to
855 : * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
856 : * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
857 : * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
858 : * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
859 : * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
860 : * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
861 : * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
862 : * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
863 : * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
864 : *
865 : * Note that previous versions of the kernel on 64-bit systems would
866 : * incorrectly use extra epoch bits 1,1 for dates between 1901 and
867 : * 1970. e2fsck will correct this, assuming that it is run on the
868 : * affected filesystem before 2242.
869 : */
870 :
871 : static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
872 : {
873 0 : u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
874 0 : return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
875 : }
876 :
877 : static inline void ext4_decode_extra_time(struct timespec64 *time,
878 : __le32 extra)
879 : {
880 0 : if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
881 0 : time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
882 0 : time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
883 0 : }
884 :
885 : #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
886 : do { \
887 : if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
888 : (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
889 : (raw_inode)->xtime ## _extra = \
890 : ext4_encode_extra_time(&(inode)->xtime); \
891 : } \
892 : else \
893 : (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
894 : } while (0)
895 :
896 : #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
897 : do { \
898 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
899 : (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
900 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
901 : (raw_inode)->xtime ## _extra = \
902 : ext4_encode_extra_time(&(einode)->xtime); \
903 : } while (0)
904 :
905 : #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
906 : do { \
907 : (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
908 : if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
909 : ext4_decode_extra_time(&(inode)->xtime, \
910 : raw_inode->xtime ## _extra); \
911 : } \
912 : else \
913 : (inode)->xtime.tv_nsec = 0; \
914 : } while (0)
915 :
916 :
917 : #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
918 : do { \
919 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
920 : (einode)->xtime.tv_sec = \
921 : (signed)le32_to_cpu((raw_inode)->xtime); \
922 : else \
923 : (einode)->xtime.tv_sec = 0; \
924 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
925 : ext4_decode_extra_time(&(einode)->xtime, \
926 : raw_inode->xtime ## _extra); \
927 : else \
928 : (einode)->xtime.tv_nsec = 0; \
929 : } while (0)
930 :
931 : #define i_disk_version osd1.linux1.l_i_version
932 :
933 : #if defined(__KERNEL__) || defined(__linux__)
934 : #define i_reserved1 osd1.linux1.l_i_reserved1
935 : #define i_file_acl_high osd2.linux2.l_i_file_acl_high
936 : #define i_blocks_high osd2.linux2.l_i_blocks_high
937 : #define i_uid_low i_uid
938 : #define i_gid_low i_gid
939 : #define i_uid_high osd2.linux2.l_i_uid_high
940 : #define i_gid_high osd2.linux2.l_i_gid_high
941 : #define i_checksum_lo osd2.linux2.l_i_checksum_lo
942 :
943 : #elif defined(__GNU__)
944 :
945 : #define i_translator osd1.hurd1.h_i_translator
946 : #define i_uid_high osd2.hurd2.h_i_uid_high
947 : #define i_gid_high osd2.hurd2.h_i_gid_high
948 : #define i_author osd2.hurd2.h_i_author
949 :
950 : #elif defined(__masix__)
951 :
952 : #define i_reserved1 osd1.masix1.m_i_reserved1
953 : #define i_file_acl_high osd2.masix2.m_i_file_acl_high
954 : #define i_reserved2 osd2.masix2.m_i_reserved2
955 :
956 : #endif /* defined(__KERNEL__) || defined(__linux__) */
957 :
958 : #include "extents_status.h"
959 : #include "fast_commit.h"
960 :
961 : /*
962 : * Lock subclasses for i_data_sem in the ext4_inode_info structure.
963 : *
964 : * These are needed to avoid lockdep false positives when we need to
965 : * allocate blocks to the quota inode during ext4_map_blocks(), while
966 : * holding i_data_sem for a normal (non-quota) inode. Since we don't
967 : * do quota tracking for the quota inode, this avoids deadlock (as
968 : * well as infinite recursion, since it isn't turtles all the way
969 : * down...)
970 : *
971 : * I_DATA_SEM_NORMAL - Used for most inodes
972 : * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
973 : * where the second inode has larger inode number
974 : * than the first
975 : * I_DATA_SEM_QUOTA - Used for quota inodes only
976 : * I_DATA_SEM_EA - Used for ea_inodes only
977 : */
978 : enum {
979 : I_DATA_SEM_NORMAL = 0,
980 : I_DATA_SEM_OTHER,
981 : I_DATA_SEM_QUOTA,
982 : I_DATA_SEM_EA
983 : };
984 :
985 :
986 : /*
987 : * fourth extended file system inode data in memory
988 : */
989 : struct ext4_inode_info {
990 : __le32 i_data[15]; /* unconverted */
991 : __u32 i_dtime;
992 : ext4_fsblk_t i_file_acl;
993 :
994 : /*
995 : * i_block_group is the number of the block group which contains
996 : * this file's inode. Constant across the lifetime of the inode,
997 : * it is used for making block allocation decisions - we try to
998 : * place a file's data blocks near its inode block, and new inodes
999 : * near to their parent directory's inode.
1000 : */
1001 : ext4_group_t i_block_group;
1002 : ext4_lblk_t i_dir_start_lookup;
1003 : #if (BITS_PER_LONG < 64)
1004 : unsigned long i_state_flags; /* Dynamic state flags */
1005 : #endif
1006 : unsigned long i_flags;
1007 :
1008 : /*
1009 : * Extended attributes can be read independently of the main file
1010 : * data. Taking i_rwsem even when reading would cause contention
1011 : * between readers of EAs and writers of regular file data, so
1012 : * instead we synchronize on xattr_sem when reading or changing
1013 : * EAs.
1014 : */
1015 : struct rw_semaphore xattr_sem;
1016 :
1017 : /*
1018 : * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1019 : * i_orphan is used.
1020 : */
1021 : union {
1022 : struct list_head i_orphan; /* unlinked but open inodes */
1023 : unsigned int i_orphan_idx; /* Index in orphan file */
1024 : };
1025 :
1026 : /* Fast commit related info */
1027 :
1028 : /* For tracking dentry create updates */
1029 : struct list_head i_fc_dilist;
1030 : struct list_head i_fc_list; /*
1031 : * inodes that need fast commit
1032 : * protected by sbi->s_fc_lock.
1033 : */
1034 :
1035 : /* Start of lblk range that needs to be committed in this fast commit */
1036 : ext4_lblk_t i_fc_lblk_start;
1037 :
1038 : /* End of lblk range that needs to be committed in this fast commit */
1039 : ext4_lblk_t i_fc_lblk_len;
1040 :
1041 : /* Number of ongoing updates on this inode */
1042 : atomic_t i_fc_updates;
1043 :
1044 : /* Fast commit wait queue for this inode */
1045 : wait_queue_head_t i_fc_wait;
1046 :
1047 : /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1048 : struct mutex i_fc_lock;
1049 :
1050 : /*
1051 : * i_disksize keeps track of what the inode size is ON DISK, not
1052 : * in memory. During truncate, i_size is set to the new size by
1053 : * the VFS prior to calling ext4_truncate(), but the filesystem won't
1054 : * set i_disksize to 0 until the truncate is actually under way.
1055 : *
1056 : * The intent is that i_disksize always represents the blocks which
1057 : * are used by this file. This allows recovery to restart truncate
1058 : * on orphans if we crash during truncate. We actually write i_disksize
1059 : * into the on-disk inode when writing inodes out, instead of i_size.
1060 : *
1061 : * The only time when i_disksize and i_size may be different is when
1062 : * a truncate is in progress. The only things which change i_disksize
1063 : * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1064 : */
1065 : loff_t i_disksize;
1066 :
1067 : /*
1068 : * i_data_sem is for serialising ext4_truncate() against
1069 : * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1070 : * data tree are chopped off during truncate. We can't do that in
1071 : * ext4 because whenever we perform intermediate commits during
1072 : * truncate, the inode and all the metadata blocks *must* be in a
1073 : * consistent state which allows truncation of the orphans to restart
1074 : * during recovery. Hence we must fix the get_block-vs-truncate race
1075 : * by other means, so we have i_data_sem.
1076 : */
1077 : struct rw_semaphore i_data_sem;
1078 : struct inode vfs_inode;
1079 : struct jbd2_inode *jinode;
1080 :
1081 : spinlock_t i_raw_lock; /* protects updates to the raw inode */
1082 :
1083 : /*
1084 : * File creation time. Its function is same as that of
1085 : * struct timespec64 i_{a,c,m}time in the generic inode.
1086 : */
1087 : struct timespec64 i_crtime;
1088 :
1089 : /* mballoc */
1090 : atomic_t i_prealloc_active;
1091 : struct rb_root i_prealloc_node;
1092 : rwlock_t i_prealloc_lock;
1093 :
1094 : /* extents status tree */
1095 : struct ext4_es_tree i_es_tree;
1096 : rwlock_t i_es_lock;
1097 : struct list_head i_es_list;
1098 : unsigned int i_es_all_nr; /* protected by i_es_lock */
1099 : unsigned int i_es_shk_nr; /* protected by i_es_lock */
1100 : ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1101 : extents to shrink. Protected by
1102 : i_es_lock */
1103 :
1104 : /* ialloc */
1105 : ext4_group_t i_last_alloc_group;
1106 :
1107 : /* allocation reservation info for delalloc */
1108 : /* In case of bigalloc, this refer to clusters rather than blocks */
1109 : unsigned int i_reserved_data_blocks;
1110 :
1111 : /* pending cluster reservations for bigalloc file systems */
1112 : struct ext4_pending_tree i_pending_tree;
1113 :
1114 : /* on-disk additional length */
1115 : __u16 i_extra_isize;
1116 :
1117 : /* Indicate the inline data space. */
1118 : u16 i_inline_off;
1119 : u16 i_inline_size;
1120 :
1121 : #ifdef CONFIG_QUOTA
1122 : /* quota space reservation, managed internally by quota code */
1123 : qsize_t i_reserved_quota;
1124 : #endif
1125 :
1126 : /* Lock protecting lists below */
1127 : spinlock_t i_completed_io_lock;
1128 : /*
1129 : * Completed IOs that need unwritten extents handling and have
1130 : * transaction reserved
1131 : */
1132 : struct list_head i_rsv_conversion_list;
1133 : struct work_struct i_rsv_conversion_work;
1134 : atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1135 :
1136 : spinlock_t i_block_reservation_lock;
1137 :
1138 : /*
1139 : * Transactions that contain inode's metadata needed to complete
1140 : * fsync and fdatasync, respectively.
1141 : */
1142 : tid_t i_sync_tid;
1143 : tid_t i_datasync_tid;
1144 :
1145 : #ifdef CONFIG_QUOTA
1146 : struct dquot *i_dquot[MAXQUOTAS];
1147 : #endif
1148 :
1149 : /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1150 : __u32 i_csum_seed;
1151 :
1152 : kprojid_t i_projid;
1153 : };
1154 :
1155 : /*
1156 : * File system states
1157 : */
1158 : #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1159 : #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1160 : #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1161 : #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1162 :
1163 : /*
1164 : * Misc. filesystem flags
1165 : */
1166 : #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1167 : #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1168 : #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1169 :
1170 : /*
1171 : * Mount flags set via mount options or defaults
1172 : */
1173 : #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1174 : #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1175 : #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1176 : #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1177 : #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1178 : #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1179 : #define EXT4_MOUNT_ERRORS_MASK 0x00070
1180 : #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1181 : #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1182 : #ifdef CONFIG_FS_DAX
1183 : #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1184 : #else
1185 : #define EXT4_MOUNT_DAX_ALWAYS 0
1186 : #endif
1187 : #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1188 : #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1189 : #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1190 : #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1191 : #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1192 : #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1193 : #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1194 : #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1195 : #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1196 : #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1197 : #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1198 : #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1199 : * enable enforcement for hidden
1200 : * quota files */
1201 : #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1202 : * enforcement for hidden quota
1203 : * files */
1204 : #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1205 : * enforcement */
1206 : #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1207 : #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1208 : #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1209 : #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1210 : #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1211 : #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1212 : #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1213 : #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1214 : #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1215 : #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1216 :
1217 : /*
1218 : * Mount flags set either automatically (could not be set by mount option)
1219 : * based on per file system feature or property or in special cases such as
1220 : * distinguishing between explicit mount option definition and default.
1221 : */
1222 : #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1223 : specified delalloc */
1224 : #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1225 : size of blocksize * 8
1226 : blocks */
1227 : #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1228 : file systems */
1229 : #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1230 : specified journal checksum */
1231 :
1232 : #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1233 : #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1234 : #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1235 : #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1236 : * scanning in mballoc
1237 : */
1238 :
1239 : #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1240 : ~EXT4_MOUNT_##opt
1241 : #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1242 : EXT4_MOUNT_##opt
1243 : #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1244 : EXT4_MOUNT_##opt)
1245 :
1246 : #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1247 : ~EXT4_MOUNT2_##opt
1248 : #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1249 : EXT4_MOUNT2_##opt
1250 : #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1251 : EXT4_MOUNT2_##opt)
1252 :
1253 : #define ext4_test_and_set_bit __test_and_set_bit_le
1254 : #define ext4_set_bit __set_bit_le
1255 : #define ext4_set_bit_atomic ext2_set_bit_atomic
1256 : #define ext4_test_and_clear_bit __test_and_clear_bit_le
1257 : #define ext4_clear_bit __clear_bit_le
1258 : #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1259 : #define ext4_test_bit test_bit_le
1260 : #define ext4_find_next_zero_bit find_next_zero_bit_le
1261 : #define ext4_find_next_bit find_next_bit_le
1262 :
1263 : extern void mb_set_bits(void *bm, int cur, int len);
1264 :
1265 : /*
1266 : * Maximal mount counts between two filesystem checks
1267 : */
1268 : #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1269 : #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1270 :
1271 : /*
1272 : * Behaviour when detecting errors
1273 : */
1274 : #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1275 : #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1276 : #define EXT4_ERRORS_PANIC 3 /* Panic */
1277 : #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1278 :
1279 : /* Metadata checksum algorithm codes */
1280 : #define EXT4_CRC32C_CHKSUM 1
1281 :
1282 : #define EXT4_LABEL_MAX 16
1283 :
1284 : /*
1285 : * Structure of the super block
1286 : */
1287 : struct ext4_super_block {
1288 : /*00*/ __le32 s_inodes_count; /* Inodes count */
1289 : __le32 s_blocks_count_lo; /* Blocks count */
1290 : __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1291 : __le32 s_free_blocks_count_lo; /* Free blocks count */
1292 : /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1293 : __le32 s_first_data_block; /* First Data Block */
1294 : __le32 s_log_block_size; /* Block size */
1295 : __le32 s_log_cluster_size; /* Allocation cluster size */
1296 : /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1297 : __le32 s_clusters_per_group; /* # Clusters per group */
1298 : __le32 s_inodes_per_group; /* # Inodes per group */
1299 : __le32 s_mtime; /* Mount time */
1300 : /*30*/ __le32 s_wtime; /* Write time */
1301 : __le16 s_mnt_count; /* Mount count */
1302 : __le16 s_max_mnt_count; /* Maximal mount count */
1303 : __le16 s_magic; /* Magic signature */
1304 : __le16 s_state; /* File system state */
1305 : __le16 s_errors; /* Behaviour when detecting errors */
1306 : __le16 s_minor_rev_level; /* minor revision level */
1307 : /*40*/ __le32 s_lastcheck; /* time of last check */
1308 : __le32 s_checkinterval; /* max. time between checks */
1309 : __le32 s_creator_os; /* OS */
1310 : __le32 s_rev_level; /* Revision level */
1311 : /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1312 : __le16 s_def_resgid; /* Default gid for reserved blocks */
1313 : /*
1314 : * These fields are for EXT4_DYNAMIC_REV superblocks only.
1315 : *
1316 : * Note: the difference between the compatible feature set and
1317 : * the incompatible feature set is that if there is a bit set
1318 : * in the incompatible feature set that the kernel doesn't
1319 : * know about, it should refuse to mount the filesystem.
1320 : *
1321 : * e2fsck's requirements are more strict; if it doesn't know
1322 : * about a feature in either the compatible or incompatible
1323 : * feature set, it must abort and not try to meddle with
1324 : * things it doesn't understand...
1325 : */
1326 : __le32 s_first_ino; /* First non-reserved inode */
1327 : __le16 s_inode_size; /* size of inode structure */
1328 : __le16 s_block_group_nr; /* block group # of this superblock */
1329 : __le32 s_feature_compat; /* compatible feature set */
1330 : /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1331 : __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1332 : /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1333 : /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */
1334 : /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1335 : /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1336 : /*
1337 : * Performance hints. Directory preallocation should only
1338 : * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1339 : */
1340 : __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1341 : __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1342 : __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1343 : /*
1344 : * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1345 : */
1346 : /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1347 : /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1348 : __le32 s_journal_dev; /* device number of journal file */
1349 : __le32 s_last_orphan; /* start of list of inodes to delete */
1350 : __le32 s_hash_seed[4]; /* HTREE hash seed */
1351 : __u8 s_def_hash_version; /* Default hash version to use */
1352 : __u8 s_jnl_backup_type;
1353 : __le16 s_desc_size; /* size of group descriptor */
1354 : /*100*/ __le32 s_default_mount_opts;
1355 : __le32 s_first_meta_bg; /* First metablock block group */
1356 : __le32 s_mkfs_time; /* When the filesystem was created */
1357 : __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1358 : /* 64bit support valid if EXT4_FEATURE_INCOMPAT_64BIT */
1359 : /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1360 : __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1361 : __le32 s_free_blocks_count_hi; /* Free blocks count */
1362 : __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1363 : __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1364 : __le32 s_flags; /* Miscellaneous flags */
1365 : __le16 s_raid_stride; /* RAID stride */
1366 : __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1367 : __le64 s_mmp_block; /* Block for multi-mount protection */
1368 : __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1369 : __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1370 : __u8 s_checksum_type; /* metadata checksum algorithm used */
1371 : __u8 s_encryption_level; /* versioning level for encryption */
1372 : __u8 s_reserved_pad; /* Padding to next 32bits */
1373 : __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1374 : __le32 s_snapshot_inum; /* Inode number of active snapshot */
1375 : __le32 s_snapshot_id; /* sequential ID of active snapshot */
1376 : __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1377 : snapshot's future use */
1378 : __le32 s_snapshot_list; /* inode number of the head of the
1379 : on-disk snapshot list */
1380 : #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1381 : __le32 s_error_count; /* number of fs errors */
1382 : __le32 s_first_error_time; /* first time an error happened */
1383 : __le32 s_first_error_ino; /* inode involved in first error */
1384 : __le64 s_first_error_block; /* block involved of first error */
1385 : __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1386 : __le32 s_first_error_line; /* line number where error happened */
1387 : __le32 s_last_error_time; /* most recent time of an error */
1388 : __le32 s_last_error_ino; /* inode involved in last error */
1389 : __le32 s_last_error_line; /* line number where error happened */
1390 : __le64 s_last_error_block; /* block involved of last error */
1391 : __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1392 : #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1393 : __u8 s_mount_opts[64];
1394 : __le32 s_usr_quota_inum; /* inode for tracking user quota */
1395 : __le32 s_grp_quota_inum; /* inode for tracking group quota */
1396 : __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1397 : __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1398 : __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1399 : __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1400 : __le32 s_lpf_ino; /* Location of the lost+found inode */
1401 : __le32 s_prj_quota_inum; /* inode for tracking project quota */
1402 : __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1403 : __u8 s_wtime_hi;
1404 : __u8 s_mtime_hi;
1405 : __u8 s_mkfs_time_hi;
1406 : __u8 s_lastcheck_hi;
1407 : __u8 s_first_error_time_hi;
1408 : __u8 s_last_error_time_hi;
1409 : __u8 s_first_error_errcode;
1410 : __u8 s_last_error_errcode;
1411 : __le16 s_encoding; /* Filename charset encoding */
1412 : __le16 s_encoding_flags; /* Filename charset encoding flags */
1413 : __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
1414 : __le32 s_reserved[94]; /* 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 : /* Types of ext4 journal triggers */
1428 : enum ext4_journal_trigger_type {
1429 : EXT4_JTR_ORPHAN_FILE,
1430 : EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
1431 : };
1432 :
1433 : #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1434 :
1435 : struct ext4_journal_trigger {
1436 : struct jbd2_buffer_trigger_type tr_triggers;
1437 : struct super_block *sb;
1438 : };
1439 :
1440 : static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1441 : struct jbd2_buffer_trigger_type *trigger)
1442 : {
1443 : return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1444 : }
1445 :
1446 : #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1447 :
1448 : /* Structure at the tail of orphan block */
1449 : struct ext4_orphan_block_tail {
1450 : __le32 ob_magic;
1451 : __le32 ob_checksum;
1452 : };
1453 :
1454 : static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1455 : {
1456 0 : return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1457 : sizeof(u32);
1458 : }
1459 :
1460 : struct ext4_orphan_block {
1461 : atomic_t ob_free_entries; /* Number of free orphan entries in block */
1462 : struct buffer_head *ob_bh; /* Buffer for orphan block */
1463 : };
1464 :
1465 : /*
1466 : * Info about orphan file.
1467 : */
1468 : struct ext4_orphan_info {
1469 : int of_blocks; /* Number of orphan blocks in a file */
1470 : __u32 of_csum_seed; /* Checksum seed for orphan file */
1471 : struct ext4_orphan_block *of_binfo; /* Array with info about orphan
1472 : * file blocks */
1473 : };
1474 :
1475 : /*
1476 : * fourth extended-fs super-block data in memory
1477 : */
1478 : struct ext4_sb_info {
1479 : unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1480 : unsigned long s_inodes_per_block;/* Number of inodes per block */
1481 : unsigned long s_blocks_per_group;/* Number of blocks in a group */
1482 : unsigned long s_clusters_per_group; /* Number of clusters in a group */
1483 : unsigned long s_inodes_per_group;/* Number of inodes in a group */
1484 : unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1485 : unsigned long s_gdb_count; /* Number of group descriptor blocks */
1486 : unsigned long s_desc_per_block; /* Number of group descriptors per block */
1487 : ext4_group_t s_groups_count; /* Number of groups in the fs */
1488 : ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1489 : unsigned long s_overhead; /* # of fs overhead clusters */
1490 : unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1491 : unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1492 : loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1493 : struct buffer_head * s_sbh; /* Buffer containing the super block */
1494 : struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1495 : struct buffer_head * __rcu *s_group_desc;
1496 : unsigned int s_mount_opt;
1497 : unsigned int s_mount_opt2;
1498 : unsigned long s_mount_flags;
1499 : unsigned int s_def_mount_opt;
1500 : unsigned int s_def_mount_opt2;
1501 : ext4_fsblk_t s_sb_block;
1502 : atomic64_t s_resv_clusters;
1503 : kuid_t s_resuid;
1504 : kgid_t s_resgid;
1505 : unsigned short s_mount_state;
1506 : unsigned short s_pad;
1507 : int s_addr_per_block_bits;
1508 : int s_desc_per_block_bits;
1509 : int s_inode_size;
1510 : int s_first_ino;
1511 : unsigned int s_inode_readahead_blks;
1512 : unsigned int s_inode_goal;
1513 : u32 s_hash_seed[4];
1514 : int s_def_hash_version;
1515 : int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1516 : struct percpu_counter s_freeclusters_counter;
1517 : struct percpu_counter s_freeinodes_counter;
1518 : struct percpu_counter s_dirs_counter;
1519 : struct percpu_counter s_dirtyclusters_counter;
1520 : struct percpu_counter s_sra_exceeded_retry_limit;
1521 : struct blockgroup_lock *s_blockgroup_lock;
1522 : struct proc_dir_entry *s_proc;
1523 : struct kobject s_kobj;
1524 : struct completion s_kobj_unregister;
1525 : struct super_block *s_sb;
1526 : struct buffer_head *s_mmp_bh;
1527 :
1528 : /* Journaling */
1529 : struct journal_s *s_journal;
1530 : unsigned long s_ext4_flags; /* Ext4 superblock flags */
1531 : struct mutex s_orphan_lock; /* Protects on disk list changes */
1532 : struct list_head s_orphan; /* List of orphaned inodes in on disk
1533 : list */
1534 : struct ext4_orphan_info s_orphan_info;
1535 : unsigned long s_commit_interval;
1536 : u32 s_max_batch_time;
1537 : u32 s_min_batch_time;
1538 : struct block_device *s_journal_bdev;
1539 : #ifdef CONFIG_QUOTA
1540 : /* Names of quota files with journalled quota */
1541 : char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1542 : int s_jquota_fmt; /* Format of quota to use */
1543 : #endif
1544 : unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1545 : struct ext4_system_blocks __rcu *s_system_blks;
1546 :
1547 : #ifdef EXTENTS_STATS
1548 : /* ext4 extents stats */
1549 : unsigned long s_ext_min;
1550 : unsigned long s_ext_max;
1551 : unsigned long s_depth_max;
1552 : spinlock_t s_ext_stats_lock;
1553 : unsigned long s_ext_blocks;
1554 : unsigned long s_ext_extents;
1555 : #endif
1556 :
1557 : /* for buddy allocator */
1558 : struct ext4_group_info ** __rcu *s_group_info;
1559 : struct inode *s_buddy_cache;
1560 : spinlock_t s_md_lock;
1561 : unsigned short *s_mb_offsets;
1562 : unsigned int *s_mb_maxs;
1563 : unsigned int s_group_info_size;
1564 : unsigned int s_mb_free_pending;
1565 : struct list_head s_freed_data_list; /* List of blocks to be freed
1566 : after commit completed */
1567 : struct list_head s_discard_list;
1568 : struct work_struct s_discard_work;
1569 : atomic_t s_retry_alloc_pending;
1570 : struct list_head *s_mb_avg_fragment_size;
1571 : rwlock_t *s_mb_avg_fragment_size_locks;
1572 : struct list_head *s_mb_largest_free_orders;
1573 : rwlock_t *s_mb_largest_free_orders_locks;
1574 :
1575 : /* tunables */
1576 : unsigned long s_stripe;
1577 : unsigned int s_mb_max_linear_groups;
1578 : unsigned int s_mb_stream_request;
1579 : unsigned int s_mb_max_to_scan;
1580 : unsigned int s_mb_min_to_scan;
1581 : unsigned int s_mb_stats;
1582 : unsigned int s_mb_order2_reqs;
1583 : unsigned int s_mb_group_prealloc;
1584 : unsigned int s_max_dir_size_kb;
1585 : /* where last allocation was done - for stream allocation */
1586 : unsigned long s_mb_last_group;
1587 : unsigned long s_mb_last_start;
1588 : unsigned int s_mb_prefetch;
1589 : unsigned int s_mb_prefetch_limit;
1590 : unsigned int s_mb_best_avail_max_trim_order;
1591 :
1592 : /* stats for buddy allocator */
1593 : atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1594 : atomic_t s_bal_success; /* we found long enough chunks */
1595 : atomic_t s_bal_allocated; /* in blocks */
1596 : atomic_t s_bal_ex_scanned; /* total extents scanned */
1597 : atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS]; /* total extents scanned */
1598 : atomic_t s_bal_groups_scanned; /* number of groups scanned */
1599 : atomic_t s_bal_goals; /* goal hits */
1600 : atomic_t s_bal_len_goals; /* len goal hits */
1601 : atomic_t s_bal_breaks; /* too long searches */
1602 : atomic_t s_bal_2orders; /* 2^order hits */
1603 : atomic_t s_bal_p2_aligned_bad_suggestions;
1604 : atomic_t s_bal_goal_fast_bad_suggestions;
1605 : atomic_t s_bal_best_avail_bad_suggestions;
1606 : atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
1607 : atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
1608 : atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS]; /* cX loop didn't find blocks */
1609 : atomic_t s_mb_buddies_generated; /* number of buddies generated */
1610 : atomic64_t s_mb_generation_time;
1611 : atomic_t s_mb_lost_chunks;
1612 : atomic_t s_mb_preallocated;
1613 : atomic_t s_mb_discarded;
1614 : atomic_t s_lock_busy;
1615 :
1616 : /* locality groups */
1617 : struct ext4_locality_group __percpu *s_locality_groups;
1618 :
1619 : /* for write statistics */
1620 : unsigned long s_sectors_written_start;
1621 : u64 s_kbytes_written;
1622 :
1623 : /* the size of zero-out chunk */
1624 : unsigned int s_extent_max_zeroout_kb;
1625 :
1626 : unsigned int s_log_groups_per_flex;
1627 : struct flex_groups * __rcu *s_flex_groups;
1628 : ext4_group_t s_flex_groups_allocated;
1629 :
1630 : /* workqueue for reserved extent conversions (buffered io) */
1631 : struct workqueue_struct *rsv_conversion_wq;
1632 :
1633 : /* timer for periodic error stats printing */
1634 : struct timer_list s_err_report;
1635 :
1636 : /* Lazy inode table initialization info */
1637 : struct ext4_li_request *s_li_request;
1638 : /* Wait multiplier for lazy initialization thread */
1639 : unsigned int s_li_wait_mult;
1640 :
1641 : /* Kernel thread for multiple mount protection */
1642 : struct task_struct *s_mmp_tsk;
1643 :
1644 : /* record the last minlen when FITRIM is called. */
1645 : unsigned long s_last_trim_minblks;
1646 :
1647 : /* Reference to checksum algorithm driver via cryptoapi */
1648 : struct crypto_shash *s_chksum_driver;
1649 :
1650 : /* Precomputed FS UUID checksum for seeding other checksums */
1651 : __u32 s_csum_seed;
1652 :
1653 : /* Reclaim extents from extent status tree */
1654 : struct shrinker s_es_shrinker;
1655 : struct list_head s_es_list; /* List of inodes with reclaimable extents */
1656 : long s_es_nr_inode;
1657 : struct ext4_es_stats s_es_stats;
1658 : struct mb_cache *s_ea_block_cache;
1659 : struct mb_cache *s_ea_inode_cache;
1660 : spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1661 :
1662 : /* Journal triggers for checksum computation */
1663 : struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1664 :
1665 : /* Ratelimit ext4 messages. */
1666 : struct ratelimit_state s_err_ratelimit_state;
1667 : struct ratelimit_state s_warning_ratelimit_state;
1668 : struct ratelimit_state s_msg_ratelimit_state;
1669 : atomic_t s_warning_count;
1670 : atomic_t s_msg_count;
1671 :
1672 : /* Encryption policy for '-o test_dummy_encryption' */
1673 : struct fscrypt_dummy_policy s_dummy_enc_policy;
1674 :
1675 : /*
1676 : * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1677 : * or EXTENTS flag.
1678 : */
1679 : struct percpu_rw_semaphore s_writepages_rwsem;
1680 : struct dax_device *s_daxdev;
1681 : u64 s_dax_part_off;
1682 : #ifdef CONFIG_EXT4_DEBUG
1683 : unsigned long s_simulate_fail;
1684 : #endif
1685 : /* Record the errseq of the backing block device */
1686 : errseq_t s_bdev_wb_err;
1687 : spinlock_t s_bdev_wb_lock;
1688 :
1689 : /* Information about errors that happened during this mount */
1690 : spinlock_t s_error_lock;
1691 : int s_add_error_count;
1692 : int s_first_error_code;
1693 : __u32 s_first_error_line;
1694 : __u32 s_first_error_ino;
1695 : __u64 s_first_error_block;
1696 : const char *s_first_error_func;
1697 : time64_t s_first_error_time;
1698 : int s_last_error_code;
1699 : __u32 s_last_error_line;
1700 : __u32 s_last_error_ino;
1701 : __u64 s_last_error_block;
1702 : const char *s_last_error_func;
1703 : time64_t s_last_error_time;
1704 : /*
1705 : * If we are in a context where we cannot update error information in
1706 : * the on-disk superblock, we queue this work to do it.
1707 : */
1708 : struct work_struct s_error_work;
1709 :
1710 : /* Ext4 fast commit sub transaction ID */
1711 : atomic_t s_fc_subtid;
1712 :
1713 : /*
1714 : * After commit starts, the main queue gets locked, and the further
1715 : * updates get added in the staging queue.
1716 : */
1717 : #define FC_Q_MAIN 0
1718 : #define FC_Q_STAGING 1
1719 : struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1720 : * that have data changes in them.
1721 : */
1722 : struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1723 : unsigned int s_fc_bytes;
1724 : /*
1725 : * Main fast commit lock. This lock protects accesses to the
1726 : * following fields:
1727 : * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1728 : */
1729 : spinlock_t s_fc_lock;
1730 : struct buffer_head *s_fc_bh;
1731 : struct ext4_fc_stats s_fc_stats;
1732 : tid_t s_fc_ineligible_tid;
1733 : #ifdef CONFIG_EXT4_DEBUG
1734 : int s_fc_debug_max_replay;
1735 : #endif
1736 : struct ext4_fc_replay_state s_fc_replay_state;
1737 : };
1738 :
1739 : static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1740 : {
1741 8 : return sb->s_fs_info;
1742 : }
1743 : static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1744 : {
1745 : return container_of(inode, struct ext4_inode_info, vfs_inode);
1746 : }
1747 :
1748 0 : static inline int ext4_writepages_down_read(struct super_block *sb)
1749 : {
1750 0 : percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
1751 0 : return memalloc_nofs_save();
1752 : }
1753 :
1754 0 : static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
1755 : {
1756 0 : memalloc_nofs_restore(ctx);
1757 0 : percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
1758 0 : }
1759 :
1760 0 : static inline int ext4_writepages_down_write(struct super_block *sb)
1761 : {
1762 0 : percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
1763 0 : return memalloc_nofs_save();
1764 : }
1765 :
1766 0 : static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
1767 : {
1768 0 : memalloc_nofs_restore(ctx);
1769 0 : percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
1770 0 : }
1771 :
1772 : static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1773 : {
1774 0 : return ino == EXT4_ROOT_INO ||
1775 0 : (ino >= EXT4_FIRST_INO(sb) &&
1776 0 : ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1777 : }
1778 :
1779 : /*
1780 : * Returns: sbi->field[index]
1781 : * Used to access an array element from the following sbi fields which require
1782 : * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1783 : * - s_group_desc
1784 : * - s_group_info
1785 : * - s_flex_group
1786 : */
1787 : #define sbi_array_rcu_deref(sbi, field, index) \
1788 : ({ \
1789 : typeof(*((sbi)->field)) _v; \
1790 : rcu_read_lock(); \
1791 : _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1792 : rcu_read_unlock(); \
1793 : _v; \
1794 : })
1795 :
1796 : /*
1797 : * run-time mount flags
1798 : */
1799 : enum {
1800 : EXT4_MF_MNTDIR_SAMPLED,
1801 : EXT4_MF_FS_ABORTED, /* Fatal error detected */
1802 : EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */
1803 : };
1804 :
1805 0 : static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1806 : {
1807 0 : set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1808 0 : }
1809 :
1810 0 : static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1811 : {
1812 0 : clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1813 0 : }
1814 :
1815 : static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1816 : {
1817 0 : return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1818 : }
1819 :
1820 :
1821 : /*
1822 : * Simulate_fail codes
1823 : */
1824 : #define EXT4_SIM_BBITMAP_EIO 1
1825 : #define EXT4_SIM_BBITMAP_CRC 2
1826 : #define EXT4_SIM_IBITMAP_EIO 3
1827 : #define EXT4_SIM_IBITMAP_CRC 4
1828 : #define EXT4_SIM_INODE_EIO 5
1829 : #define EXT4_SIM_INODE_CRC 6
1830 : #define EXT4_SIM_DIRBLOCK_EIO 7
1831 : #define EXT4_SIM_DIRBLOCK_CRC 8
1832 :
1833 : static inline bool ext4_simulate_fail(struct super_block *sb,
1834 : unsigned long code)
1835 : {
1836 : #ifdef CONFIG_EXT4_DEBUG
1837 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1838 :
1839 0 : if (unlikely(sbi->s_simulate_fail == code)) {
1840 0 : sbi->s_simulate_fail = 0;
1841 0 : return true;
1842 : }
1843 : #endif
1844 : return false;
1845 : }
1846 :
1847 0 : static inline void ext4_simulate_fail_bh(struct super_block *sb,
1848 : struct buffer_head *bh,
1849 : unsigned long code)
1850 : {
1851 0 : if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1852 0 : clear_buffer_uptodate(bh);
1853 0 : }
1854 :
1855 : /*
1856 : * Error number codes for s_{first,last}_error_errno
1857 : *
1858 : * Linux errno numbers are architecture specific, so we need to translate
1859 : * them into something which is architecture independent. We don't define
1860 : * codes for all errno's; just the ones which are most likely to be the cause
1861 : * of an ext4_error() call.
1862 : */
1863 : #define EXT4_ERR_UNKNOWN 1
1864 : #define EXT4_ERR_EIO 2
1865 : #define EXT4_ERR_ENOMEM 3
1866 : #define EXT4_ERR_EFSBADCRC 4
1867 : #define EXT4_ERR_EFSCORRUPTED 5
1868 : #define EXT4_ERR_ENOSPC 6
1869 : #define EXT4_ERR_ENOKEY 7
1870 : #define EXT4_ERR_EROFS 8
1871 : #define EXT4_ERR_EFBIG 9
1872 : #define EXT4_ERR_EEXIST 10
1873 : #define EXT4_ERR_ERANGE 11
1874 : #define EXT4_ERR_EOVERFLOW 12
1875 : #define EXT4_ERR_EBUSY 13
1876 : #define EXT4_ERR_ENOTDIR 14
1877 : #define EXT4_ERR_ENOTEMPTY 15
1878 : #define EXT4_ERR_ESHUTDOWN 16
1879 : #define EXT4_ERR_EFAULT 17
1880 :
1881 : /*
1882 : * Inode dynamic state flags
1883 : */
1884 : enum {
1885 : EXT4_STATE_NEW, /* inode is newly created */
1886 : EXT4_STATE_XATTR, /* has in-inode xattrs */
1887 : EXT4_STATE_NO_EXPAND, /* No space for expansion */
1888 : EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1889 : EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1890 : EXT4_STATE_NEWENTRY, /* File just added to dir */
1891 : EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1892 : EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1893 : EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1894 : EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1895 : EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1896 : EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
1897 : };
1898 :
1899 : #define EXT4_INODE_BIT_FNS(name, field, offset) \
1900 : static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1901 : { \
1902 : return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1903 : } \
1904 : static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1905 : { \
1906 : set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1907 : } \
1908 : static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1909 : { \
1910 : clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1911 : }
1912 :
1913 : /* Add these declarations here only so that these functions can be
1914 : * found by name. Otherwise, they are very hard to locate. */
1915 : static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1916 : static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1917 : static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1918 0 : EXT4_INODE_BIT_FNS(flag, flags, 0)
1919 :
1920 : /* Add these declarations here only so that these functions can be
1921 : * found by name. Otherwise, they are very hard to locate. */
1922 : static inline int ext4_test_inode_state(struct inode *inode, int bit);
1923 : static inline void ext4_set_inode_state(struct inode *inode, int bit);
1924 : static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1925 : #if (BITS_PER_LONG < 64)
1926 : EXT4_INODE_BIT_FNS(state, state_flags, 0)
1927 :
1928 : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1929 : {
1930 : (ei)->i_state_flags = 0;
1931 : }
1932 : #else
1933 0 : EXT4_INODE_BIT_FNS(state, flags, 32)
1934 :
1935 : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1936 : {
1937 : /* We depend on the fact that callers will set i_flags */
1938 : }
1939 : #endif
1940 : #else
1941 : /* Assume that user mode programs are passing in an ext4fs superblock, not
1942 : * a kernel struct super_block. This will allow us to call the feature-test
1943 : * macros from user land. */
1944 : #define EXT4_SB(sb) (sb)
1945 : #endif
1946 :
1947 : static inline bool ext4_verity_in_progress(struct inode *inode)
1948 : {
1949 : return IS_ENABLED(CONFIG_FS_VERITY) &&
1950 : ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1951 : }
1952 :
1953 : #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1954 :
1955 : /*
1956 : * Codes for operating systems
1957 : */
1958 : #define EXT4_OS_LINUX 0
1959 : #define EXT4_OS_HURD 1
1960 : #define EXT4_OS_MASIX 2
1961 : #define EXT4_OS_FREEBSD 3
1962 : #define EXT4_OS_LITES 4
1963 :
1964 : /*
1965 : * Revision levels
1966 : */
1967 : #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1968 : #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1969 :
1970 : #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1971 :
1972 : #define EXT4_GOOD_OLD_INODE_SIZE 128
1973 :
1974 : #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1975 : #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1976 : #define EXT4_TIMESTAMP_MIN S32_MIN
1977 :
1978 : /*
1979 : * Feature set definitions
1980 : */
1981 :
1982 : #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1983 : #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1984 : #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1985 : #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1986 : #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1987 : #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1988 : #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1989 : /*
1990 : * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1991 : * incompatible only if fast commit blocks are present in the FS. Since we
1992 : * clear the journal (and thus the fast commit blocks), we don't mark FS as
1993 : * incompatible. We also have a JBD2 incompat feature, which gets set when
1994 : * there are fast commit blocks present in the journal.
1995 : */
1996 : #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
1997 : #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1998 : #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
1999 :
2000 : #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
2001 : #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
2002 : #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
2003 : #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
2004 : #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
2005 : #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
2006 : #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
2007 : #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
2008 : #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
2009 : /*
2010 : * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
2011 : * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2012 : * all other data structures' checksums. However, the METADATA_CSUM and
2013 : * GDT_CSUM bits are mutually exclusive.
2014 : */
2015 : #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
2016 : #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
2017 : #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
2018 : #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
2019 : #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be
2020 : non-empty */
2021 :
2022 : #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
2023 : #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
2024 : #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
2025 : #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
2026 : #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
2027 : #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
2028 : #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
2029 : #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
2030 : #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
2031 : #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
2032 : #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
2033 : #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
2034 : #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
2035 : #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
2036 : #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
2037 : #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
2038 :
2039 : extern void ext4_update_dynamic_rev(struct super_block *sb);
2040 :
2041 : #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2042 : static inline bool ext4_has_feature_##name(struct super_block *sb) \
2043 : { \
2044 : return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2045 : cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2046 : } \
2047 : static inline void ext4_set_feature_##name(struct super_block *sb) \
2048 : { \
2049 : ext4_update_dynamic_rev(sb); \
2050 : EXT4_SB(sb)->s_es->s_feature_compat |= \
2051 : cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2052 : } \
2053 : static inline void ext4_clear_feature_##name(struct super_block *sb) \
2054 : { \
2055 : EXT4_SB(sb)->s_es->s_feature_compat &= \
2056 : ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2057 : }
2058 :
2059 : #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2060 : static inline bool ext4_has_feature_##name(struct super_block *sb) \
2061 : { \
2062 : return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2063 : cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2064 : } \
2065 : static inline void ext4_set_feature_##name(struct super_block *sb) \
2066 : { \
2067 : ext4_update_dynamic_rev(sb); \
2068 : EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2069 : cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2070 : } \
2071 : static inline void ext4_clear_feature_##name(struct super_block *sb) \
2072 : { \
2073 : EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2074 : ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2075 : }
2076 :
2077 : #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2078 : static inline bool ext4_has_feature_##name(struct super_block *sb) \
2079 : { \
2080 : return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2081 : cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2082 : } \
2083 : static inline void ext4_set_feature_##name(struct super_block *sb) \
2084 : { \
2085 : ext4_update_dynamic_rev(sb); \
2086 : EXT4_SB(sb)->s_es->s_feature_incompat |= \
2087 : cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2088 : } \
2089 : static inline void ext4_clear_feature_##name(struct super_block *sb) \
2090 : { \
2091 : EXT4_SB(sb)->s_es->s_feature_incompat &= \
2092 : ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2093 : }
2094 :
2095 : EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2096 : EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2097 0 : EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2098 0 : EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2099 0 : EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2100 0 : EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2101 0 : EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2102 0 : EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2103 0 : EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2104 0 : EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
2105 :
2106 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2107 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2108 : EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2109 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2110 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2111 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2112 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2113 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2114 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2115 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2116 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2117 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2118 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2119 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
2120 :
2121 : EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2122 0 : EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2123 0 : EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2124 : EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2125 0 : EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2126 0 : EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2127 0 : EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2128 0 : EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2129 0 : EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2130 0 : EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2131 : EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2132 0 : EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2133 0 : EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2134 0 : EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2135 0 : EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2136 0 : EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2137 :
2138 : #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2139 : #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2140 : EXT4_FEATURE_INCOMPAT_META_BG)
2141 : #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2142 : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2143 : EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2144 :
2145 : #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2146 : #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2147 : EXT4_FEATURE_INCOMPAT_RECOVER| \
2148 : EXT4_FEATURE_INCOMPAT_META_BG)
2149 : #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2150 : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2151 : EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2152 :
2153 : #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2154 : EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2155 : #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2156 : EXT4_FEATURE_INCOMPAT_RECOVER| \
2157 : EXT4_FEATURE_INCOMPAT_META_BG| \
2158 : EXT4_FEATURE_INCOMPAT_EXTENTS| \
2159 : EXT4_FEATURE_INCOMPAT_64BIT| \
2160 : EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2161 : EXT4_FEATURE_INCOMPAT_EA_INODE| \
2162 : EXT4_FEATURE_INCOMPAT_MMP | \
2163 : EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2164 : EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2165 : EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2166 : EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2167 : EXT4_FEATURE_INCOMPAT_LARGEDIR)
2168 : #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2169 : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2170 : EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2171 : EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2172 : EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2173 : EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2174 : EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2175 : EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2176 : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2177 : EXT4_FEATURE_RO_COMPAT_QUOTA |\
2178 : EXT4_FEATURE_RO_COMPAT_PROJECT |\
2179 : EXT4_FEATURE_RO_COMPAT_VERITY |\
2180 : EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2181 :
2182 : #define EXTN_FEATURE_FUNCS(ver) \
2183 : static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2184 : { \
2185 : return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2186 : cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2187 : } \
2188 : static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2189 : { \
2190 : return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2191 : cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2192 : } \
2193 : static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2194 : { \
2195 : return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2196 : cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2197 : }
2198 :
2199 : EXTN_FEATURE_FUNCS(2)
2200 0 : EXTN_FEATURE_FUNCS(3)
2201 0 : EXTN_FEATURE_FUNCS(4)
2202 :
2203 : static inline bool ext4_has_compat_features(struct super_block *sb)
2204 : {
2205 0 : return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2206 : }
2207 : static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2208 : {
2209 0 : return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2210 : }
2211 : static inline bool ext4_has_incompat_features(struct super_block *sb)
2212 : {
2213 0 : return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2214 : }
2215 :
2216 : extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2217 :
2218 : /*
2219 : * Superblock flags
2220 : */
2221 : #define EXT4_FLAGS_RESIZING 0
2222 : #define EXT4_FLAGS_SHUTDOWN 1
2223 : #define EXT4_FLAGS_BDEV_IS_DAX 2
2224 :
2225 : static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2226 : {
2227 0 : return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2228 : }
2229 :
2230 : /*
2231 : * Default values for user and/or group using reserved blocks
2232 : */
2233 : #define EXT4_DEF_RESUID 0
2234 : #define EXT4_DEF_RESGID 0
2235 :
2236 : /*
2237 : * Default project ID
2238 : */
2239 : #define EXT4_DEF_PROJID 0
2240 :
2241 : #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2242 :
2243 : /*
2244 : * Default mount options
2245 : */
2246 : #define EXT4_DEFM_DEBUG 0x0001
2247 : #define EXT4_DEFM_BSDGROUPS 0x0002
2248 : #define EXT4_DEFM_XATTR_USER 0x0004
2249 : #define EXT4_DEFM_ACL 0x0008
2250 : #define EXT4_DEFM_UID16 0x0010
2251 : #define EXT4_DEFM_JMODE 0x0060
2252 : #define EXT4_DEFM_JMODE_DATA 0x0020
2253 : #define EXT4_DEFM_JMODE_ORDERED 0x0040
2254 : #define EXT4_DEFM_JMODE_WBACK 0x0060
2255 : #define EXT4_DEFM_NOBARRIER 0x0100
2256 : #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2257 : #define EXT4_DEFM_DISCARD 0x0400
2258 : #define EXT4_DEFM_NODELALLOC 0x0800
2259 :
2260 : /*
2261 : * Default journal batch times
2262 : */
2263 : #define EXT4_DEF_MIN_BATCH_TIME 0
2264 : #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2265 :
2266 : /*
2267 : * Minimum number of groups in a flexgroup before we separate out
2268 : * directories into the first block group of a flexgroup
2269 : */
2270 : #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2271 :
2272 : /*
2273 : * Structure of a directory entry
2274 : */
2275 : #define EXT4_NAME_LEN 255
2276 : /*
2277 : * Base length of the ext4 directory entry excluding the name length
2278 : */
2279 : #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2280 :
2281 : struct ext4_dir_entry {
2282 : __le32 inode; /* Inode number */
2283 : __le16 rec_len; /* Directory entry length */
2284 : __le16 name_len; /* Name length */
2285 : char name[EXT4_NAME_LEN]; /* File name */
2286 : };
2287 :
2288 :
2289 : /*
2290 : * Encrypted Casefolded entries require saving the hash on disk. This structure
2291 : * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2292 : * boundary.
2293 : */
2294 : struct ext4_dir_entry_hash {
2295 : __le32 hash;
2296 : __le32 minor_hash;
2297 : };
2298 :
2299 : /*
2300 : * The new version of the directory entry. Since EXT4 structures are
2301 : * stored in intel byte order, and the name_len field could never be
2302 : * bigger than 255 chars, it's safe to reclaim the extra byte for the
2303 : * file_type field.
2304 : */
2305 : struct ext4_dir_entry_2 {
2306 : __le32 inode; /* Inode number */
2307 : __le16 rec_len; /* Directory entry length */
2308 : __u8 name_len; /* Name length */
2309 : __u8 file_type; /* See file type macros EXT4_FT_* below */
2310 : char name[EXT4_NAME_LEN]; /* File name */
2311 : };
2312 :
2313 : /*
2314 : * Access the hashes at the end of ext4_dir_entry_2
2315 : */
2316 : #define EXT4_DIRENT_HASHES(entry) \
2317 : ((struct ext4_dir_entry_hash *) \
2318 : (((void *)(entry)) + \
2319 : ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2320 : #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2321 : #define EXT4_DIRENT_MINOR_HASH(entry) \
2322 : le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2323 :
2324 : static inline bool ext4_hash_in_dirent(const struct inode *inode)
2325 : {
2326 0 : return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2327 : }
2328 :
2329 : /*
2330 : * This is a bogus directory entry at the end of each leaf block that
2331 : * records checksums.
2332 : */
2333 : struct ext4_dir_entry_tail {
2334 : __le32 det_reserved_zero1; /* Pretend to be unused */
2335 : __le16 det_rec_len; /* 12 */
2336 : __u8 det_reserved_zero2; /* Zero name length */
2337 : __u8 det_reserved_ft; /* 0xDE, fake file type */
2338 : __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2339 : };
2340 :
2341 : #define EXT4_DIRENT_TAIL(block, blocksize) \
2342 : ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2343 : ((blocksize) - \
2344 : sizeof(struct ext4_dir_entry_tail))))
2345 :
2346 : /*
2347 : * Ext4 directory file types. Only the low 3 bits are used. The
2348 : * other bits are reserved for now.
2349 : */
2350 : #define EXT4_FT_UNKNOWN 0
2351 : #define EXT4_FT_REG_FILE 1
2352 : #define EXT4_FT_DIR 2
2353 : #define EXT4_FT_CHRDEV 3
2354 : #define EXT4_FT_BLKDEV 4
2355 : #define EXT4_FT_FIFO 5
2356 : #define EXT4_FT_SOCK 6
2357 : #define EXT4_FT_SYMLINK 7
2358 :
2359 : #define EXT4_FT_MAX 8
2360 :
2361 : #define EXT4_FT_DIR_CSUM 0xDE
2362 :
2363 : /*
2364 : * EXT4_DIR_PAD defines the directory entries boundaries
2365 : *
2366 : * NOTE: It must be a multiple of 4
2367 : */
2368 : #define EXT4_DIR_PAD 4
2369 : #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2370 : #define EXT4_MAX_REC_LEN ((1<<16)-1)
2371 :
2372 : /*
2373 : * The rec_len is dependent on the type of directory. Directories that are
2374 : * casefolded and encrypted need to store the hash as well, so we add room for
2375 : * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2376 : * pass NULL for dir, as those entries do not use the extra fields.
2377 : */
2378 : static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2379 : const struct inode *dir)
2380 : {
2381 0 : int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2382 :
2383 0 : if (dir && ext4_hash_in_dirent(dir))
2384 0 : rec_len += sizeof(struct ext4_dir_entry_hash);
2385 0 : return (rec_len & ~EXT4_DIR_ROUND);
2386 : }
2387 :
2388 : /*
2389 : * If we ever get support for fs block sizes > page_size, we'll need
2390 : * to remove the #if statements in the next two functions...
2391 : */
2392 : static inline unsigned int
2393 : ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2394 : {
2395 0 : unsigned len = le16_to_cpu(dlen);
2396 :
2397 : #if (PAGE_SIZE >= 65536)
2398 0 : if (len == EXT4_MAX_REC_LEN || len == 0)
2399 : return blocksize;
2400 0 : return (len & 65532) | ((len & 3) << 16);
2401 : #else
2402 : return len;
2403 : #endif
2404 : }
2405 :
2406 0 : static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2407 : {
2408 0 : BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2409 : #if (PAGE_SIZE >= 65536)
2410 0 : if (len < 65536)
2411 0 : return cpu_to_le16(len);
2412 0 : if (len == blocksize) {
2413 0 : if (blocksize == 65536)
2414 : return cpu_to_le16(EXT4_MAX_REC_LEN);
2415 : else
2416 0 : return cpu_to_le16(0);
2417 : }
2418 0 : return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2419 : #else
2420 : return cpu_to_le16(len);
2421 : #endif
2422 : }
2423 :
2424 : /*
2425 : * Hash Tree Directory indexing
2426 : * (c) Daniel Phillips, 2001
2427 : */
2428 :
2429 : #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2430 : ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2431 : #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2432 : !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2433 : #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2434 :
2435 : /* Legal values for the dx_root hash_version field: */
2436 :
2437 : #define DX_HASH_LEGACY 0
2438 : #define DX_HASH_HALF_MD4 1
2439 : #define DX_HASH_TEA 2
2440 : #define DX_HASH_LEGACY_UNSIGNED 3
2441 : #define DX_HASH_HALF_MD4_UNSIGNED 4
2442 : #define DX_HASH_TEA_UNSIGNED 5
2443 : #define DX_HASH_SIPHASH 6
2444 :
2445 0 : static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2446 : const void *address, unsigned int length)
2447 : {
2448 0 : struct {
2449 : struct shash_desc shash;
2450 : char ctx[4];
2451 : } desc;
2452 :
2453 0 : BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2454 :
2455 0 : desc.shash.tfm = sbi->s_chksum_driver;
2456 0 : *(u32 *)desc.ctx = crc;
2457 :
2458 0 : BUG_ON(crypto_shash_update(&desc.shash, address, length));
2459 :
2460 0 : return *(u32 *)desc.ctx;
2461 : }
2462 :
2463 : #ifdef __KERNEL__
2464 :
2465 : /* hash info structure used by the directory hash */
2466 : struct dx_hash_info
2467 : {
2468 : u32 hash;
2469 : u32 minor_hash;
2470 : int hash_version;
2471 : u32 *seed;
2472 : };
2473 :
2474 :
2475 : /* 32 and 64 bit signed EOF for dx directories */
2476 : #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2477 : #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2478 :
2479 :
2480 : /*
2481 : * Control parameters used by ext4_htree_next_block
2482 : */
2483 : #define HASH_NB_ALWAYS 1
2484 :
2485 : struct ext4_filename {
2486 : const struct qstr *usr_fname;
2487 : struct fscrypt_str disk_name;
2488 : struct dx_hash_info hinfo;
2489 : #ifdef CONFIG_FS_ENCRYPTION
2490 : struct fscrypt_str crypto_buf;
2491 : #endif
2492 : #if IS_ENABLED(CONFIG_UNICODE)
2493 : struct fscrypt_str cf_name;
2494 : #endif
2495 : };
2496 :
2497 : #define fname_name(p) ((p)->disk_name.name)
2498 : #define fname_usr_name(p) ((p)->usr_fname->name)
2499 : #define fname_len(p) ((p)->disk_name.len)
2500 :
2501 : /*
2502 : * Describe an inode's exact location on disk and in memory
2503 : */
2504 : struct ext4_iloc
2505 : {
2506 : struct buffer_head *bh;
2507 : unsigned long offset;
2508 : ext4_group_t block_group;
2509 : };
2510 :
2511 : static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2512 : {
2513 0 : return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2514 : }
2515 :
2516 : static inline bool ext4_is_quota_file(struct inode *inode)
2517 : {
2518 0 : return IS_NOQUOTA(inode) &&
2519 0 : !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2520 : }
2521 :
2522 : /*
2523 : * This structure is stuffed into the struct file's private_data field
2524 : * for directories. It is where we put information so that we can do
2525 : * readdir operations in hash tree order.
2526 : */
2527 : struct dir_private_info {
2528 : struct rb_root root;
2529 : struct rb_node *curr_node;
2530 : struct fname *extra_fname;
2531 : loff_t last_pos;
2532 : __u32 curr_hash;
2533 : __u32 curr_minor_hash;
2534 : __u32 next_hash;
2535 : };
2536 :
2537 : /* calculate the first block number of the group */
2538 : static inline ext4_fsblk_t
2539 : ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2540 : {
2541 0 : return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2542 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2543 : }
2544 :
2545 : /*
2546 : * Special error return code only used by dx_probe() and its callers.
2547 : */
2548 : #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2549 :
2550 : /* htree levels for ext4 */
2551 : #define EXT4_HTREE_LEVEL_COMPAT 2
2552 : #define EXT4_HTREE_LEVEL 3
2553 :
2554 : static inline int ext4_dir_htree_level(struct super_block *sb)
2555 : {
2556 0 : return ext4_has_feature_largedir(sb) ?
2557 0 : EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2558 : }
2559 :
2560 : /*
2561 : * Timeout and state flag for lazy initialization inode thread.
2562 : */
2563 : #define EXT4_DEF_LI_WAIT_MULT 10
2564 : #define EXT4_DEF_LI_MAX_START_DELAY 5
2565 : #define EXT4_LAZYINIT_QUIT 0x0001
2566 : #define EXT4_LAZYINIT_RUNNING 0x0002
2567 :
2568 : /*
2569 : * Lazy inode table initialization info
2570 : */
2571 : struct ext4_lazy_init {
2572 : unsigned long li_state;
2573 : struct list_head li_request_list;
2574 : struct mutex li_list_mtx;
2575 : };
2576 :
2577 : enum ext4_li_mode {
2578 : EXT4_LI_MODE_PREFETCH_BBITMAP,
2579 : EXT4_LI_MODE_ITABLE,
2580 : };
2581 :
2582 : struct ext4_li_request {
2583 : struct super_block *lr_super;
2584 : enum ext4_li_mode lr_mode;
2585 : ext4_group_t lr_first_not_zeroed;
2586 : ext4_group_t lr_next_group;
2587 : struct list_head lr_request;
2588 : unsigned long lr_next_sched;
2589 : unsigned long lr_timeout;
2590 : };
2591 :
2592 : struct ext4_features {
2593 : struct kobject f_kobj;
2594 : struct completion f_kobj_unregister;
2595 : };
2596 :
2597 : /*
2598 : * This structure will be used for multiple mount protection. It will be
2599 : * written into the block number saved in the s_mmp_block field in the
2600 : * superblock. Programs that check MMP should assume that if
2601 : * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2602 : * to use the filesystem, regardless of how old the timestamp is.
2603 : */
2604 : #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2605 : #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2606 : #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2607 : #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2608 :
2609 : struct mmp_struct {
2610 : __le32 mmp_magic; /* Magic number for MMP */
2611 : __le32 mmp_seq; /* Sequence no. updated periodically */
2612 :
2613 : /*
2614 : * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2615 : * purposes and do not affect the correctness of the algorithm
2616 : */
2617 : __le64 mmp_time; /* Time last updated */
2618 : char mmp_nodename[64]; /* Node which last updated MMP block */
2619 : char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2620 :
2621 : /*
2622 : * mmp_check_interval is used to verify if the MMP block has been
2623 : * updated on the block device. The value is updated based on the
2624 : * maximum time to write the MMP block during an update cycle.
2625 : */
2626 : __le16 mmp_check_interval;
2627 :
2628 : __le16 mmp_pad1;
2629 : __le32 mmp_pad2[226];
2630 : __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2631 : };
2632 :
2633 : /* arguments passed to the mmp thread */
2634 : struct mmpd_data {
2635 : struct buffer_head *bh; /* bh from initial read_mmp_block() */
2636 : struct super_block *sb; /* super block of the fs */
2637 : };
2638 :
2639 : /*
2640 : * Check interval multiplier
2641 : * The MMP block is written every update interval and initially checked every
2642 : * update interval x the multiplier (the value is then adapted based on the
2643 : * write latency). The reason is that writes can be delayed under load and we
2644 : * don't want readers to incorrectly assume that the filesystem is no longer
2645 : * in use.
2646 : */
2647 : #define EXT4_MMP_CHECK_MULT 2UL
2648 :
2649 : /*
2650 : * Minimum interval for MMP checking in seconds.
2651 : */
2652 : #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2653 :
2654 : /*
2655 : * Maximum interval for MMP checking in seconds.
2656 : */
2657 : #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2658 :
2659 : /*
2660 : * Function prototypes
2661 : */
2662 :
2663 : /*
2664 : * Ok, these declarations are also in <linux/kernel.h> but none of the
2665 : * ext4 source programs needs to include it so they are duplicated here.
2666 : */
2667 : # define NORET_TYPE /**/
2668 : # define ATTRIB_NORET __attribute__((noreturn))
2669 : # define NORET_AND noreturn,
2670 :
2671 : /* bitmap.c */
2672 : extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2673 : void ext4_inode_bitmap_csum_set(struct super_block *sb,
2674 : struct ext4_group_desc *gdp,
2675 : struct buffer_head *bh, int sz);
2676 : int ext4_inode_bitmap_csum_verify(struct super_block *sb,
2677 : struct ext4_group_desc *gdp,
2678 : struct buffer_head *bh, int sz);
2679 : void ext4_block_bitmap_csum_set(struct super_block *sb,
2680 : struct ext4_group_desc *gdp,
2681 : struct buffer_head *bh);
2682 : int ext4_block_bitmap_csum_verify(struct super_block *sb,
2683 : struct ext4_group_desc *gdp,
2684 : struct buffer_head *bh);
2685 :
2686 : /* balloc.c */
2687 : extern void ext4_get_group_no_and_offset(struct super_block *sb,
2688 : ext4_fsblk_t blocknr,
2689 : ext4_group_t *blockgrpp,
2690 : ext4_grpblk_t *offsetp);
2691 : extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2692 : ext4_fsblk_t block);
2693 :
2694 : extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2695 : extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2696 : ext4_group_t group);
2697 : extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2698 : ext4_fsblk_t goal,
2699 : unsigned int flags,
2700 : unsigned long *count,
2701 : int *errp);
2702 : extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2703 : s64 nclusters, unsigned int flags);
2704 : extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2705 : extern void ext4_check_blocks_bitmap(struct super_block *);
2706 : extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2707 : ext4_group_t block_group,
2708 : struct buffer_head ** bh);
2709 : extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2710 : ext4_group_t group);
2711 : extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2712 :
2713 : extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2714 : ext4_group_t block_group,
2715 : bool ignore_locked);
2716 : extern int ext4_wait_block_bitmap(struct super_block *sb,
2717 : ext4_group_t block_group,
2718 : struct buffer_head *bh);
2719 : extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2720 : ext4_group_t block_group);
2721 : extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2722 : ext4_group_t block_group,
2723 : struct ext4_group_desc *gdp);
2724 : ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2725 :
2726 : #if IS_ENABLED(CONFIG_UNICODE)
2727 : extern int ext4_fname_setup_ci_filename(struct inode *dir,
2728 : const struct qstr *iname,
2729 : struct ext4_filename *fname);
2730 : #endif
2731 :
2732 : /* ext4 encryption related stuff goes here crypto.c */
2733 : #ifdef CONFIG_FS_ENCRYPTION
2734 : extern const struct fscrypt_operations ext4_cryptops;
2735 :
2736 : int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2737 : int lookup, struct ext4_filename *fname);
2738 :
2739 : int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2740 : struct ext4_filename *fname);
2741 :
2742 : void ext4_fname_free_filename(struct ext4_filename *fname);
2743 :
2744 : int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2745 :
2746 : #else /* !CONFIG_FS_ENCRYPTION */
2747 : static inline int ext4_fname_setup_filename(struct inode *dir,
2748 : const struct qstr *iname,
2749 : int lookup,
2750 : struct ext4_filename *fname)
2751 : {
2752 0 : int err = 0;
2753 0 : fname->usr_fname = iname;
2754 0 : fname->disk_name.name = (unsigned char *) iname->name;
2755 0 : fname->disk_name.len = iname->len;
2756 :
2757 : #if IS_ENABLED(CONFIG_UNICODE)
2758 : err = ext4_fname_setup_ci_filename(dir, iname, fname);
2759 : #endif
2760 :
2761 0 : return err;
2762 : }
2763 :
2764 : static inline int ext4_fname_prepare_lookup(struct inode *dir,
2765 : struct dentry *dentry,
2766 : struct ext4_filename *fname)
2767 : {
2768 0 : return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2769 : }
2770 :
2771 : static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2772 : {
2773 : #if IS_ENABLED(CONFIG_UNICODE)
2774 : kfree(fname->cf_name.name);
2775 : fname->cf_name.name = NULL;
2776 : #endif
2777 : }
2778 :
2779 : static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2780 : void __user *arg)
2781 : {
2782 : return -EOPNOTSUPP;
2783 : }
2784 : #endif /* !CONFIG_FS_ENCRYPTION */
2785 :
2786 : /* dir.c */
2787 : extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2788 : struct file *,
2789 : struct ext4_dir_entry_2 *,
2790 : struct buffer_head *, char *, int,
2791 : unsigned int);
2792 : #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2793 : unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2794 : (de), (bh), (buf), (size), (offset)))
2795 : extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2796 : __u32 minor_hash,
2797 : struct ext4_dir_entry_2 *dirent,
2798 : struct fscrypt_str *ent_name);
2799 : extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2800 : extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2801 : struct buffer_head *bh,
2802 : void *buf, int buf_size,
2803 : struct ext4_filename *fname,
2804 : struct ext4_dir_entry_2 **dest_de);
2805 : void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2806 : struct ext4_dir_entry_2 *de,
2807 : int buf_size,
2808 : struct ext4_filename *fname);
2809 0 : static inline void ext4_update_dx_flag(struct inode *inode)
2810 : {
2811 0 : if (!ext4_has_feature_dir_index(inode->i_sb) &&
2812 : ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2813 : /* ext4_iget() should have caught this... */
2814 0 : WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2815 0 : ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2816 : }
2817 0 : }
2818 : static const unsigned char ext4_filetype_table[] = {
2819 : DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2820 : };
2821 :
2822 : static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2823 : {
2824 0 : if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2825 : return DT_UNKNOWN;
2826 :
2827 0 : return ext4_filetype_table[filetype];
2828 : }
2829 : extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2830 : void *buf, int buf_size);
2831 :
2832 : /* fsync.c */
2833 : extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2834 :
2835 : /* hash.c */
2836 : extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2837 : struct dx_hash_info *hinfo);
2838 :
2839 : /* ialloc.c */
2840 : extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2841 : extern struct inode *__ext4_new_inode(struct mnt_idmap *, handle_t *,
2842 : struct inode *, umode_t,
2843 : const struct qstr *qstr, __u32 goal,
2844 : uid_t *owner, __u32 i_flags,
2845 : int handle_type, unsigned int line_no,
2846 : int nblocks);
2847 :
2848 : #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2849 : __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \
2850 : (goal), (owner), i_flags, 0, 0, 0)
2851 : #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
2852 : type, nblocks) \
2853 : __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
2854 : 0, (type), __LINE__, (nblocks))
2855 :
2856 :
2857 : extern void ext4_free_inode(handle_t *, struct inode *);
2858 : extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2859 : extern unsigned long ext4_count_free_inodes(struct super_block *);
2860 : extern unsigned long ext4_count_dirs(struct super_block *);
2861 : extern void ext4_check_inodes_bitmap(struct super_block *);
2862 : extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2863 : extern int ext4_init_inode_table(struct super_block *sb,
2864 : ext4_group_t group, int barrier);
2865 : extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2866 :
2867 : /* fast_commit.c */
2868 : int ext4_fc_info_show(struct seq_file *seq, void *v);
2869 : void ext4_fc_init(struct super_block *sb, journal_t *journal);
2870 : void ext4_fc_init_inode(struct inode *inode);
2871 : void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2872 : ext4_lblk_t end);
2873 : void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2874 : struct dentry *dentry);
2875 : void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2876 : struct dentry *dentry);
2877 : void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2878 : void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2879 : void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2880 : struct dentry *dentry);
2881 : void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2882 : void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2883 : void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2884 : void ext4_fc_start_update(struct inode *inode);
2885 : void ext4_fc_stop_update(struct inode *inode);
2886 : void ext4_fc_del(struct inode *inode);
2887 : bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2888 : void ext4_fc_replay_cleanup(struct super_block *sb);
2889 : int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2890 : int __init ext4_fc_init_dentry_cache(void);
2891 : void ext4_fc_destroy_dentry_cache(void);
2892 : int ext4_fc_record_regions(struct super_block *sb, int ino,
2893 : ext4_lblk_t lblk, ext4_fsblk_t pblk,
2894 : int len, int replay);
2895 :
2896 : /* mballoc.c */
2897 : extern const struct seq_operations ext4_mb_seq_groups_ops;
2898 : extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2899 : extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2900 : extern int ext4_mb_init(struct super_block *);
2901 : extern int ext4_mb_release(struct super_block *);
2902 : extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2903 : struct ext4_allocation_request *, int *);
2904 : extern int ext4_mb_reserve_blocks(struct super_block *, int);
2905 : extern void ext4_discard_preallocations(struct inode *, unsigned int);
2906 : extern int __init ext4_init_mballoc(void);
2907 : extern void ext4_exit_mballoc(void);
2908 : extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2909 : ext4_group_t group,
2910 : unsigned int nr, int *cnt);
2911 : extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2912 : unsigned int nr);
2913 :
2914 : extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2915 : struct buffer_head *bh, ext4_fsblk_t block,
2916 : unsigned long count, int flags);
2917 : extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2918 : ext4_group_t ngroups);
2919 : extern int ext4_mb_add_groupinfo(struct super_block *sb,
2920 : ext4_group_t i, struct ext4_group_desc *desc);
2921 : extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2922 : ext4_fsblk_t block, unsigned long count);
2923 : extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2924 : extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2925 : extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2926 : int len, int state);
2927 :
2928 : /* inode.c */
2929 : void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2930 : struct ext4_inode_info *ei);
2931 : int ext4_inode_is_fast_symlink(struct inode *inode);
2932 : struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2933 : struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2934 : int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2935 : bool wait, struct buffer_head **bhs);
2936 : int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2937 : struct buffer_head *bh_result, int create);
2938 : int ext4_get_block(struct inode *inode, sector_t iblock,
2939 : struct buffer_head *bh_result, int create);
2940 : int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2941 : struct buffer_head *bh, int create);
2942 : int ext4_walk_page_buffers(handle_t *handle,
2943 : struct inode *inode,
2944 : struct buffer_head *head,
2945 : unsigned from,
2946 : unsigned to,
2947 : int *partial,
2948 : int (*fn)(handle_t *handle, struct inode *inode,
2949 : struct buffer_head *bh));
2950 : int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2951 : struct buffer_head *bh);
2952 : #define FALL_BACK_TO_NONDELALLOC 1
2953 : #define CONVERT_INLINE_DATA 2
2954 :
2955 : typedef enum {
2956 : EXT4_IGET_NORMAL = 0,
2957 : EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2958 : EXT4_IGET_HANDLE = 0x0002, /* Inode # is from a handle */
2959 : EXT4_IGET_BAD = 0x0004, /* Allow to iget a bad inode */
2960 : EXT4_IGET_EA_INODE = 0x0008 /* Inode should contain an EA value */
2961 : } ext4_iget_flags;
2962 :
2963 : extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2964 : ext4_iget_flags flags, const char *function,
2965 : unsigned int line);
2966 :
2967 : #define ext4_iget(sb, ino, flags) \
2968 : __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2969 :
2970 : extern int ext4_write_inode(struct inode *, struct writeback_control *);
2971 : extern int ext4_setattr(struct mnt_idmap *, struct dentry *,
2972 : struct iattr *);
2973 : extern u32 ext4_dio_alignment(struct inode *inode);
2974 : extern int ext4_getattr(struct mnt_idmap *, const struct path *,
2975 : struct kstat *, u32, unsigned int);
2976 : extern void ext4_evict_inode(struct inode *);
2977 : extern void ext4_clear_inode(struct inode *);
2978 : extern int ext4_file_getattr(struct mnt_idmap *, const struct path *,
2979 : struct kstat *, u32, unsigned int);
2980 : extern int ext4_sync_inode(handle_t *, struct inode *);
2981 : extern void ext4_dirty_inode(struct inode *, int);
2982 : extern int ext4_change_inode_journal_flag(struct inode *, int);
2983 : extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2984 : extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2985 : struct ext4_iloc *iloc);
2986 : extern int ext4_inode_attach_jinode(struct inode *inode);
2987 : extern int ext4_can_truncate(struct inode *inode);
2988 : extern int ext4_truncate(struct inode *);
2989 : extern int ext4_break_layouts(struct inode *);
2990 : extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2991 : extern void ext4_set_inode_flags(struct inode *, bool init);
2992 : extern int ext4_alloc_da_blocks(struct inode *inode);
2993 : extern void ext4_set_aops(struct inode *inode);
2994 : extern int ext4_writepage_trans_blocks(struct inode *);
2995 : extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
2996 : extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2997 : extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2998 : loff_t lstart, loff_t lend);
2999 : extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
3000 : extern qsize_t *ext4_get_reserved_space(struct inode *inode);
3001 : extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
3002 : extern void ext4_da_release_space(struct inode *inode, int to_free);
3003 : extern void ext4_da_update_reserve_space(struct inode *inode,
3004 : int used, int quota_claim);
3005 : extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3006 : ext4_fsblk_t pblk, ext4_lblk_t len);
3007 :
3008 : /* indirect.c */
3009 : extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3010 : struct ext4_map_blocks *map, int flags);
3011 : extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3012 : extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3013 : extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3014 : ext4_lblk_t start, ext4_lblk_t end);
3015 :
3016 : /* ioctl.c */
3017 : extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3018 : extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3019 : int ext4_fileattr_set(struct mnt_idmap *idmap,
3020 : struct dentry *dentry, struct fileattr *fa);
3021 : int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3022 : extern void ext4_reset_inode_seed(struct inode *inode);
3023 : int ext4_update_overhead(struct super_block *sb, bool force);
3024 : int ext4_force_shutdown(struct super_block *sb, u32 flags);
3025 :
3026 : /* migrate.c */
3027 : extern int ext4_ext_migrate(struct inode *);
3028 : extern int ext4_ind_migrate(struct inode *inode);
3029 :
3030 : /* namei.c */
3031 : extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3032 : struct inode *inode);
3033 : extern int ext4_dirblock_csum_verify(struct inode *inode,
3034 : struct buffer_head *bh);
3035 : extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3036 : __u32 start_minor_hash, __u32 *next_hash);
3037 : extern int ext4_search_dir(struct buffer_head *bh,
3038 : char *search_buf,
3039 : int buf_size,
3040 : struct inode *dir,
3041 : struct ext4_filename *fname,
3042 : unsigned int offset,
3043 : struct ext4_dir_entry_2 **res_dir);
3044 : extern int ext4_generic_delete_entry(struct inode *dir,
3045 : struct ext4_dir_entry_2 *de_del,
3046 : struct buffer_head *bh,
3047 : void *entry_buf,
3048 : int buf_size,
3049 : int csum_size);
3050 : extern bool ext4_empty_dir(struct inode *inode);
3051 :
3052 : /* resize.c */
3053 : extern void ext4_kvfree_array_rcu(void *to_free);
3054 : extern int ext4_group_add(struct super_block *sb,
3055 : struct ext4_new_group_data *input);
3056 : extern int ext4_group_extend(struct super_block *sb,
3057 : struct ext4_super_block *es,
3058 : ext4_fsblk_t n_blocks_count);
3059 : extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3060 : extern unsigned int ext4_list_backups(struct super_block *sb,
3061 : unsigned int *three, unsigned int *five,
3062 : unsigned int *seven);
3063 :
3064 : /* super.c */
3065 : extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3066 : sector_t block, blk_opf_t op_flags);
3067 : extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3068 : sector_t block);
3069 : extern void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
3070 : bh_end_io_t *end_io);
3071 : extern int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
3072 : bh_end_io_t *end_io);
3073 : extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
3074 : extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3075 : extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3076 : extern int ext4_calculate_overhead(struct super_block *sb);
3077 : extern __le32 ext4_superblock_csum(struct super_block *sb,
3078 : struct ext4_super_block *es);
3079 : extern void ext4_superblock_csum_set(struct super_block *sb);
3080 : extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3081 : ext4_group_t ngroup);
3082 : extern const char *ext4_decode_error(struct super_block *sb, int errno,
3083 : char nbuf[16]);
3084 : extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3085 : ext4_group_t block_group,
3086 : unsigned int flags);
3087 :
3088 : extern __printf(7, 8)
3089 : void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3090 : int, __u64, const char *, ...);
3091 : extern __printf(6, 7)
3092 : void __ext4_error_inode(struct inode *, const char *, unsigned int,
3093 : ext4_fsblk_t, int, const char *, ...);
3094 : extern __printf(5, 6)
3095 : void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3096 : const char *, ...);
3097 : extern void __ext4_std_error(struct super_block *, const char *,
3098 : unsigned int, int);
3099 : extern __printf(4, 5)
3100 : void __ext4_warning(struct super_block *, const char *, unsigned int,
3101 : const char *, ...);
3102 : extern __printf(4, 5)
3103 : void __ext4_warning_inode(const struct inode *inode, const char *function,
3104 : unsigned int line, const char *fmt, ...);
3105 : extern __printf(3, 4)
3106 : void __ext4_msg(struct super_block *, const char *, const char *, ...);
3107 : extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3108 : const char *, unsigned int, const char *);
3109 : extern __printf(7, 8)
3110 : void __ext4_grp_locked_error(const char *, unsigned int,
3111 : struct super_block *, ext4_group_t,
3112 : unsigned long, ext4_fsblk_t,
3113 : const char *, ...);
3114 :
3115 : #define EXT4_ERROR_INODE(inode, fmt, a...) \
3116 : ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3117 :
3118 : #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3119 : __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3120 :
3121 : #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3122 : __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3123 : (fmt), ## a)
3124 :
3125 : #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3126 : ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3127 :
3128 : #define ext4_abort(sb, err, fmt, a...) \
3129 : __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3130 :
3131 : #ifdef CONFIG_PRINTK
3132 :
3133 : #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3134 : __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3135 : #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3136 : __ext4_error_inode((inode), (func), (line), (block), \
3137 : (err), (fmt), ##__VA_ARGS__)
3138 : #define ext4_error_file(file, func, line, block, fmt, ...) \
3139 : __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3140 : #define ext4_error(sb, fmt, ...) \
3141 : __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3142 : ##__VA_ARGS__)
3143 : #define ext4_error_err(sb, err, fmt, ...) \
3144 : __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3145 : ##__VA_ARGS__)
3146 : #define ext4_warning(sb, fmt, ...) \
3147 : __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3148 : #define ext4_warning_inode(inode, fmt, ...) \
3149 : __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3150 : #define ext4_msg(sb, level, fmt, ...) \
3151 : __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3152 : #define dump_mmp_msg(sb, mmp, msg) \
3153 : __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3154 : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3155 : __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3156 : fmt, ##__VA_ARGS__)
3157 :
3158 : #else
3159 :
3160 : #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3161 : do { \
3162 : no_printk(fmt, ##__VA_ARGS__); \
3163 : __ext4_error_inode(inode, "", 0, block, 0, " "); \
3164 : } while (0)
3165 : #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3166 : do { \
3167 : no_printk(fmt, ##__VA_ARGS__); \
3168 : __ext4_error_inode(inode, "", 0, block, err, " "); \
3169 : } while (0)
3170 : #define ext4_error_file(file, func, line, block, fmt, ...) \
3171 : do { \
3172 : no_printk(fmt, ##__VA_ARGS__); \
3173 : __ext4_error_file(file, "", 0, block, " "); \
3174 : } while (0)
3175 : #define ext4_error(sb, fmt, ...) \
3176 : do { \
3177 : no_printk(fmt, ##__VA_ARGS__); \
3178 : __ext4_error(sb, "", 0, false, 0, 0, " "); \
3179 : } while (0)
3180 : #define ext4_error_err(sb, err, fmt, ...) \
3181 : do { \
3182 : no_printk(fmt, ##__VA_ARGS__); \
3183 : __ext4_error(sb, "", 0, false, err, 0, " "); \
3184 : } while (0)
3185 : #define ext4_warning(sb, fmt, ...) \
3186 : do { \
3187 : no_printk(fmt, ##__VA_ARGS__); \
3188 : __ext4_warning(sb, "", 0, " "); \
3189 : } while (0)
3190 : #define ext4_warning_inode(inode, fmt, ...) \
3191 : do { \
3192 : no_printk(fmt, ##__VA_ARGS__); \
3193 : __ext4_warning_inode(inode, "", 0, " "); \
3194 : } while (0)
3195 : #define ext4_msg(sb, level, fmt, ...) \
3196 : do { \
3197 : no_printk(fmt, ##__VA_ARGS__); \
3198 : __ext4_msg(sb, "", " "); \
3199 : } while (0)
3200 : #define dump_mmp_msg(sb, mmp, msg) \
3201 : __dump_mmp_msg(sb, mmp, "", 0, "")
3202 : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3203 : do { \
3204 : no_printk(fmt, ##__VA_ARGS__); \
3205 : __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3206 : } while (0)
3207 :
3208 : #endif
3209 :
3210 : extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3211 : struct ext4_group_desc *bg);
3212 : extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3213 : struct ext4_group_desc *bg);
3214 : extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3215 : struct ext4_group_desc *bg);
3216 : extern __u32 ext4_free_group_clusters(struct super_block *sb,
3217 : struct ext4_group_desc *bg);
3218 : extern __u32 ext4_free_inodes_count(struct super_block *sb,
3219 : struct ext4_group_desc *bg);
3220 : extern __u32 ext4_used_dirs_count(struct super_block *sb,
3221 : struct ext4_group_desc *bg);
3222 : extern __u32 ext4_itable_unused_count(struct super_block *sb,
3223 : struct ext4_group_desc *bg);
3224 : extern void ext4_block_bitmap_set(struct super_block *sb,
3225 : struct ext4_group_desc *bg, ext4_fsblk_t blk);
3226 : extern void ext4_inode_bitmap_set(struct super_block *sb,
3227 : struct ext4_group_desc *bg, ext4_fsblk_t blk);
3228 : extern void ext4_inode_table_set(struct super_block *sb,
3229 : struct ext4_group_desc *bg, ext4_fsblk_t blk);
3230 : extern void ext4_free_group_clusters_set(struct super_block *sb,
3231 : struct ext4_group_desc *bg,
3232 : __u32 count);
3233 : extern void ext4_free_inodes_set(struct super_block *sb,
3234 : struct ext4_group_desc *bg, __u32 count);
3235 : extern void ext4_used_dirs_set(struct super_block *sb,
3236 : struct ext4_group_desc *bg, __u32 count);
3237 : extern void ext4_itable_unused_set(struct super_block *sb,
3238 : struct ext4_group_desc *bg, __u32 count);
3239 : extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3240 : struct ext4_group_desc *gdp);
3241 : extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3242 : struct ext4_group_desc *gdp);
3243 : extern int ext4_register_li_request(struct super_block *sb,
3244 : ext4_group_t first_not_zeroed);
3245 :
3246 0 : static inline int ext4_has_metadata_csum(struct super_block *sb)
3247 : {
3248 0 : WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3249 : !EXT4_SB(sb)->s_chksum_driver);
3250 :
3251 0 : return ext4_has_feature_metadata_csum(sb) &&
3252 0 : (EXT4_SB(sb)->s_chksum_driver != NULL);
3253 : }
3254 :
3255 0 : static inline int ext4_has_group_desc_csum(struct super_block *sb)
3256 : {
3257 0 : return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3258 : }
3259 :
3260 : #define ext4_read_incompat_64bit_val(es, name) \
3261 : (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3262 : ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3263 : le32_to_cpu(es->name##_lo))
3264 :
3265 : static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3266 : {
3267 0 : return ext4_read_incompat_64bit_val(es, s_blocks_count);
3268 : }
3269 :
3270 : static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3271 : {
3272 0 : return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3273 : }
3274 :
3275 : static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3276 : {
3277 0 : return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3278 : }
3279 :
3280 : static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3281 : ext4_fsblk_t blk)
3282 : {
3283 0 : es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3284 0 : es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3285 : }
3286 :
3287 : static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3288 : ext4_fsblk_t blk)
3289 : {
3290 0 : es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3291 0 : es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3292 0 : }
3293 :
3294 : static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3295 : ext4_fsblk_t blk)
3296 : {
3297 0 : es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3298 0 : es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3299 : }
3300 :
3301 0 : static inline loff_t ext4_isize(struct super_block *sb,
3302 : struct ext4_inode *raw_inode)
3303 : {
3304 0 : if (ext4_has_feature_largedir(sb) ||
3305 0 : S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3306 0 : return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3307 0 : le32_to_cpu(raw_inode->i_size_lo);
3308 :
3309 0 : return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3310 : }
3311 :
3312 : static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3313 : {
3314 0 : raw_inode->i_size_lo = cpu_to_le32(i_size);
3315 0 : raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3316 : }
3317 :
3318 : /*
3319 : * Reading s_groups_count requires using smp_rmb() afterwards. See
3320 : * the locking protocol documented in the comments of ext4_group_add()
3321 : * in resize.c
3322 : */
3323 : static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3324 : {
3325 0 : ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3326 :
3327 0 : smp_rmb();
3328 0 : return ngroups;
3329 : }
3330 :
3331 : static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3332 : ext4_group_t block_group)
3333 : {
3334 0 : return block_group >> sbi->s_log_groups_per_flex;
3335 : }
3336 :
3337 : static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3338 : {
3339 0 : return 1 << sbi->s_log_groups_per_flex;
3340 : }
3341 :
3342 : #define ext4_std_error(sb, errno) \
3343 : do { \
3344 : if ((errno)) \
3345 : __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3346 : } while (0)
3347 :
3348 : #ifdef CONFIG_SMP
3349 : /* Each CPU can accumulate percpu_counter_batch clusters in their local
3350 : * counters. So we need to make sure we have free clusters more
3351 : * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3352 : */
3353 : #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3354 : #else
3355 : #define EXT4_FREECLUSTERS_WATERMARK 0
3356 : #endif
3357 :
3358 : /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3359 0 : static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3360 : {
3361 0 : WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3362 : !inode_is_locked(inode));
3363 0 : down_write(&EXT4_I(inode)->i_data_sem);
3364 0 : if (newsize > EXT4_I(inode)->i_disksize)
3365 0 : WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3366 0 : up_write(&EXT4_I(inode)->i_data_sem);
3367 0 : }
3368 :
3369 : /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3370 0 : static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3371 : {
3372 0 : int changed = 0;
3373 :
3374 0 : if (newsize > inode->i_size) {
3375 0 : i_size_write(inode, newsize);
3376 0 : changed = 1;
3377 : }
3378 0 : if (newsize > EXT4_I(inode)->i_disksize) {
3379 0 : ext4_update_i_disksize(inode, newsize);
3380 0 : changed |= 2;
3381 : }
3382 0 : return changed;
3383 : }
3384 :
3385 : int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3386 : loff_t len);
3387 :
3388 : struct ext4_group_info {
3389 : unsigned long bb_state;
3390 : #ifdef AGGRESSIVE_CHECK
3391 : unsigned long bb_check_counter;
3392 : #endif
3393 : struct rb_root bb_free_root;
3394 : ext4_grpblk_t bb_first_free; /* first free block */
3395 : ext4_grpblk_t bb_free; /* total free blocks */
3396 : ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3397 : int bb_avg_fragment_size_order; /* order of average
3398 : fragment in BG */
3399 : ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3400 : ext4_group_t bb_group; /* Group number */
3401 : struct list_head bb_prealloc_list;
3402 : #ifdef DOUBLE_CHECK
3403 : void *bb_bitmap;
3404 : #endif
3405 : struct rw_semaphore alloc_sem;
3406 : struct list_head bb_avg_fragment_size_node;
3407 : struct list_head bb_largest_free_order_node;
3408 : ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3409 : * regions, index is order.
3410 : * bb_counters[3] = 5 means
3411 : * 5 free 8-block regions. */
3412 : };
3413 :
3414 : #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3415 : #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3416 : #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3417 : #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3418 : #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3419 : (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3420 : #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3421 : (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3422 : #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3423 :
3424 : #define EXT4_MB_GRP_NEED_INIT(grp) \
3425 : (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3426 : #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3427 : (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3428 : #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3429 : (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3430 :
3431 : #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3432 : (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3433 : #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3434 : (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3435 : #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3436 : (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3437 : #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3438 : (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3439 :
3440 : #define EXT4_MAX_CONTENTION 8
3441 : #define EXT4_CONTENTION_THRESHOLD 2
3442 :
3443 : static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3444 : ext4_group_t group)
3445 : {
3446 0 : return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3447 : }
3448 :
3449 : /*
3450 : * Returns true if the filesystem is busy enough that attempts to
3451 : * access the block group locks has run into contention.
3452 : */
3453 : static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3454 : {
3455 0 : return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3456 : }
3457 :
3458 0 : static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3459 : {
3460 0 : spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3461 0 : if (spin_trylock(lock))
3462 : /*
3463 : * We're able to grab the lock right away, so drop the
3464 : * lock contention counter.
3465 : */
3466 0 : atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3467 : else {
3468 : /*
3469 : * The lock is busy, so bump the contention counter,
3470 : * and then wait on the spin lock.
3471 : */
3472 0 : atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3473 : EXT4_MAX_CONTENTION);
3474 0 : spin_lock(lock);
3475 : }
3476 0 : }
3477 :
3478 : static inline void ext4_unlock_group(struct super_block *sb,
3479 : ext4_group_t group)
3480 : {
3481 0 : spin_unlock(ext4_group_lock_ptr(sb, group));
3482 0 : }
3483 :
3484 : #ifdef CONFIG_QUOTA
3485 0 : static inline bool ext4_quota_capable(struct super_block *sb)
3486 : {
3487 0 : return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3488 : }
3489 :
3490 0 : static inline bool ext4_is_quota_journalled(struct super_block *sb)
3491 : {
3492 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
3493 :
3494 0 : return (ext4_has_feature_quota(sb) ||
3495 0 : sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3496 : }
3497 : int ext4_enable_quotas(struct super_block *sb);
3498 : #endif
3499 :
3500 : /*
3501 : * Block validity checking
3502 : */
3503 : #define ext4_check_indirect_blockref(inode, bh) \
3504 : ext4_check_blockref(__func__, __LINE__, inode, \
3505 : (__le32 *)(bh)->b_data, \
3506 : EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3507 :
3508 : #define ext4_ind_check_inode(inode) \
3509 : ext4_check_blockref(__func__, __LINE__, inode, \
3510 : EXT4_I(inode)->i_data, \
3511 : EXT4_NDIR_BLOCKS)
3512 :
3513 : /*
3514 : * Inodes and files operations
3515 : */
3516 :
3517 : /* dir.c */
3518 : extern const struct file_operations ext4_dir_operations;
3519 :
3520 : /* file.c */
3521 : extern const struct inode_operations ext4_file_inode_operations;
3522 : extern const struct file_operations ext4_file_operations;
3523 : extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3524 :
3525 : /* inline.c */
3526 : extern int ext4_get_max_inline_size(struct inode *inode);
3527 : extern int ext4_find_inline_data_nolock(struct inode *inode);
3528 : extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3529 : unsigned int len);
3530 : extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3531 :
3532 : int ext4_readpage_inline(struct inode *inode, struct folio *folio);
3533 : extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3534 : struct inode *inode,
3535 : loff_t pos, unsigned len,
3536 : struct page **pagep);
3537 : int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
3538 : unsigned copied, struct folio *folio);
3539 : extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3540 : struct inode *inode,
3541 : loff_t pos, unsigned len,
3542 : struct page **pagep,
3543 : void **fsdata);
3544 : extern int ext4_try_add_inline_entry(handle_t *handle,
3545 : struct ext4_filename *fname,
3546 : struct inode *dir, struct inode *inode);
3547 : extern int ext4_try_create_inline_dir(handle_t *handle,
3548 : struct inode *parent,
3549 : struct inode *inode);
3550 : extern int ext4_read_inline_dir(struct file *filp,
3551 : struct dir_context *ctx,
3552 : int *has_inline_data);
3553 : extern int ext4_inlinedir_to_tree(struct file *dir_file,
3554 : struct inode *dir, ext4_lblk_t block,
3555 : struct dx_hash_info *hinfo,
3556 : __u32 start_hash, __u32 start_minor_hash,
3557 : int *has_inline_data);
3558 : extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3559 : struct ext4_filename *fname,
3560 : struct ext4_dir_entry_2 **res_dir,
3561 : int *has_inline_data);
3562 : extern int ext4_delete_inline_entry(handle_t *handle,
3563 : struct inode *dir,
3564 : struct ext4_dir_entry_2 *de_del,
3565 : struct buffer_head *bh,
3566 : int *has_inline_data);
3567 : extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3568 : extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3569 : struct ext4_dir_entry_2 **parent_de,
3570 : int *retval);
3571 : extern void *ext4_read_inline_link(struct inode *inode);
3572 :
3573 : struct iomap;
3574 : extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3575 :
3576 : extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3577 :
3578 : extern int ext4_convert_inline_data(struct inode *inode);
3579 :
3580 : static inline int ext4_has_inline_data(struct inode *inode)
3581 : {
3582 0 : return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3583 0 : EXT4_I(inode)->i_inline_off;
3584 : }
3585 :
3586 : /* namei.c */
3587 : extern const struct inode_operations ext4_dir_inode_operations;
3588 : extern const struct inode_operations ext4_special_inode_operations;
3589 : extern struct dentry *ext4_get_parent(struct dentry *child);
3590 : extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3591 : struct ext4_dir_entry_2 *de,
3592 : int blocksize, int csum_size,
3593 : unsigned int parent_ino, int dotdot_real_len);
3594 : extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3595 : unsigned int blocksize);
3596 : extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3597 : struct buffer_head *bh);
3598 : extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
3599 : struct inode *inode, struct dentry *dentry);
3600 : extern int __ext4_link(struct inode *dir, struct inode *inode,
3601 : struct dentry *dentry);
3602 :
3603 : #define S_SHIFT 12
3604 : static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3605 : [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3606 : [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3607 : [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3608 : [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3609 : [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3610 : [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3611 : [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3612 : };
3613 :
3614 : static inline void ext4_set_de_type(struct super_block *sb,
3615 : struct ext4_dir_entry_2 *de,
3616 : umode_t mode) {
3617 0 : if (ext4_has_feature_filetype(sb))
3618 0 : de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3619 : }
3620 :
3621 : /* readpages.c */
3622 : extern int ext4_mpage_readpages(struct inode *inode,
3623 : struct readahead_control *rac, struct folio *folio);
3624 : extern int __init ext4_init_post_read_processing(void);
3625 : extern void ext4_exit_post_read_processing(void);
3626 :
3627 : /* symlink.c */
3628 : extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3629 : extern const struct inode_operations ext4_symlink_inode_operations;
3630 : extern const struct inode_operations ext4_fast_symlink_inode_operations;
3631 :
3632 : /* sysfs.c */
3633 : extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3634 : extern int ext4_register_sysfs(struct super_block *sb);
3635 : extern void ext4_unregister_sysfs(struct super_block *sb);
3636 : extern int __init ext4_init_sysfs(void);
3637 : extern void ext4_exit_sysfs(void);
3638 :
3639 : /* block_validity */
3640 : extern void ext4_release_system_zone(struct super_block *sb);
3641 : extern int ext4_setup_system_zone(struct super_block *sb);
3642 : extern int __init ext4_init_system_zone(void);
3643 : extern void ext4_exit_system_zone(void);
3644 : extern int ext4_inode_block_valid(struct inode *inode,
3645 : ext4_fsblk_t start_blk,
3646 : unsigned int count);
3647 : extern int ext4_check_blockref(const char *, unsigned int,
3648 : struct inode *, __le32 *, unsigned int);
3649 : extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3650 : ext4_fsblk_t start_blk, unsigned int count);
3651 :
3652 :
3653 : /* extents.c */
3654 : struct ext4_ext_path;
3655 : struct ext4_extent;
3656 :
3657 : /*
3658 : * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3659 : * __le32.
3660 : */
3661 : #define EXT_MAX_BLOCKS 0xffffffff
3662 :
3663 : extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3664 : extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3665 : extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3666 : struct ext4_map_blocks *map, int flags);
3667 : extern int ext4_ext_truncate(handle_t *, struct inode *);
3668 : extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3669 : ext4_lblk_t end);
3670 : extern void ext4_ext_init(struct super_block *);
3671 : extern void ext4_ext_release(struct super_block *);
3672 : extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3673 : loff_t len);
3674 : extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3675 : loff_t offset, ssize_t len);
3676 : extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3677 : ext4_io_end_t *io_end);
3678 : extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3679 : struct ext4_map_blocks *map, int flags);
3680 : extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3681 : int num,
3682 : struct ext4_ext_path *path);
3683 : extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3684 : struct ext4_ext_path **,
3685 : struct ext4_extent *, int);
3686 : extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3687 : struct ext4_ext_path **,
3688 : int flags);
3689 : extern void ext4_free_ext_path(struct ext4_ext_path *);
3690 : extern int ext4_ext_check_inode(struct inode *inode);
3691 : extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3692 : extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3693 : __u64 start, __u64 len);
3694 : extern int ext4_get_es_cache(struct inode *inode,
3695 : struct fiemap_extent_info *fieinfo,
3696 : __u64 start, __u64 len);
3697 : extern int ext4_ext_precache(struct inode *inode);
3698 : extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3699 : struct inode *inode2, ext4_lblk_t lblk1,
3700 : ext4_lblk_t lblk2, ext4_lblk_t count,
3701 : int mark_unwritten,int *err);
3702 : extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3703 : extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3704 : int check_cred, int restart_cred,
3705 : int revoke_cred);
3706 : extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3707 : extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3708 : extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3709 : int len, int unwritten, ext4_fsblk_t pblk);
3710 : extern int ext4_ext_clear_bb(struct inode *inode);
3711 :
3712 :
3713 : /* move_extent.c */
3714 : extern void ext4_double_down_write_data_sem(struct inode *first,
3715 : struct inode *second);
3716 : extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3717 : struct inode *donor_inode);
3718 : extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3719 : __u64 start_orig, __u64 start_donor,
3720 : __u64 len, __u64 *moved_len);
3721 :
3722 : /* page-io.c */
3723 : extern int __init ext4_init_pageio(void);
3724 : extern void ext4_exit_pageio(void);
3725 : extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3726 : extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3727 : extern int ext4_put_io_end(ext4_io_end_t *io_end);
3728 : extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3729 : extern void ext4_io_submit_init(struct ext4_io_submit *io,
3730 : struct writeback_control *wbc);
3731 : extern void ext4_end_io_rsv_work(struct work_struct *work);
3732 : extern void ext4_io_submit(struct ext4_io_submit *io);
3733 : int ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
3734 : size_t len);
3735 : extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3736 : extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3737 :
3738 : /* mmp.c */
3739 : extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3740 :
3741 : /* mmp.c */
3742 : extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3743 :
3744 : /* verity.c */
3745 : extern const struct fsverity_operations ext4_verityops;
3746 :
3747 : /* orphan.c */
3748 : extern int ext4_orphan_add(handle_t *, struct inode *);
3749 : extern int ext4_orphan_del(handle_t *, struct inode *);
3750 : extern void ext4_orphan_cleanup(struct super_block *sb,
3751 : struct ext4_super_block *es);
3752 : extern void ext4_release_orphan_info(struct super_block *sb);
3753 : extern int ext4_init_orphan_info(struct super_block *sb);
3754 : extern int ext4_orphan_file_empty(struct super_block *sb);
3755 : extern void ext4_orphan_file_block_trigger(
3756 : struct jbd2_buffer_trigger_type *triggers,
3757 : struct buffer_head *bh,
3758 : void *data, size_t size);
3759 :
3760 : /*
3761 : * Add new method to test whether block and inode bitmaps are properly
3762 : * initialized. With uninit_bg reading the block from disk is not enough
3763 : * to mark the bitmap uptodate. We need to also zero-out the bitmap
3764 : */
3765 : #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3766 :
3767 0 : static inline int bitmap_uptodate(struct buffer_head *bh)
3768 : {
3769 0 : return (buffer_uptodate(bh) &&
3770 0 : test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3771 : }
3772 0 : static inline void set_bitmap_uptodate(struct buffer_head *bh)
3773 : {
3774 0 : set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3775 0 : }
3776 :
3777 : #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3778 :
3779 : /* For ioend & aio unwritten conversion wait queues */
3780 : #define EXT4_WQ_HASH_SZ 37
3781 : #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3782 : EXT4_WQ_HASH_SZ])
3783 : extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3784 :
3785 : extern int ext4_resize_begin(struct super_block *sb);
3786 : extern int ext4_resize_end(struct super_block *sb, bool update_backups);
3787 :
3788 0 : static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3789 : struct ext4_io_end *io_end)
3790 : {
3791 0 : if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3792 0 : io_end->flag |= EXT4_IO_END_UNWRITTEN;
3793 0 : atomic_inc(&EXT4_I(inode)->i_unwritten);
3794 : }
3795 0 : }
3796 :
3797 0 : static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3798 : {
3799 0 : struct inode *inode = io_end->inode;
3800 :
3801 0 : if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3802 0 : io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3803 : /* Wake up anyone waiting on unwritten extent conversion */
3804 0 : if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3805 0 : wake_up_all(ext4_ioend_wq(inode));
3806 : }
3807 0 : }
3808 :
3809 : extern const struct iomap_ops ext4_iomap_ops;
3810 : extern const struct iomap_ops ext4_iomap_overwrite_ops;
3811 : extern const struct iomap_ops ext4_iomap_report_ops;
3812 :
3813 4 : static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3814 : {
3815 : /*
3816 : * If the buffer has the write error flag, we have failed
3817 : * to write out data in the block. In this case, we don't
3818 : * have to read the block because we may read the old data
3819 : * successfully.
3820 : */
3821 8 : if (buffer_write_io_error(bh))
3822 0 : set_buffer_uptodate(bh);
3823 4 : return buffer_uptodate(bh);
3824 : }
3825 :
3826 : #endif /* __KERNEL__ */
3827 :
3828 : #define EFSBADCRC EBADMSG /* Bad CRC detected */
3829 : #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3830 :
3831 : #endif /* _EXT4_H */
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