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/types.h>
21 : #include <linux/blkdev.h>
22 : #include <linux/magic.h>
23 : #include <linux/jbd2.h>
24 : #include <linux/quota.h>
25 : #include <linux/rwsem.h>
26 : #include <linux/rbtree.h>
27 : #include <linux/seqlock.h>
28 : #include <linux/mutex.h>
29 : #include <linux/timer.h>
30 : #include <linux/wait.h>
31 : #include <linux/sched/signal.h>
32 : #include <linux/blockgroup_lock.h>
33 : #include <linux/percpu_counter.h>
34 : #include <linux/ratelimit.h>
35 : #include <crypto/hash.h>
36 : #include <linux/falloc.h>
37 : #include <linux/percpu-rwsem.h>
38 : #include <linux/fiemap.h>
39 : #ifdef __KERNEL__
40 : #include <linux/compat.h>
41 : #endif
42 :
43 : #include <linux/fscrypt.h>
44 : #include <linux/fsverity.h>
45 :
46 : #include <linux/compiler.h>
47 :
48 : /*
49 : * The fourth extended filesystem constants/structures
50 : */
51 :
52 : /*
53 : * with AGGRESSIVE_CHECK allocator runs consistency checks over
54 : * structures. these checks slow things down a lot
55 : */
56 : #define AGGRESSIVE_CHECK__
57 :
58 : /*
59 : * with DOUBLE_CHECK defined mballoc creates persistent in-core
60 : * bitmaps, maintains and uses them to check for double allocations
61 : */
62 : #define DOUBLE_CHECK__
63 :
64 : /*
65 : * Define EXT4FS_DEBUG to produce debug messages
66 : */
67 : #undef EXT4FS_DEBUG
68 :
69 : /*
70 : * Debug code
71 : */
72 : #ifdef EXT4FS_DEBUG
73 : #define ext4_debug(f, a...) \
74 : do { \
75 : printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
76 : __FILE__, __LINE__, __func__); \
77 : printk(KERN_DEBUG f, ## a); \
78 : } while (0)
79 : #else
80 : #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
81 : #endif
82 :
83 : /*
84 : * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
85 : */
86 : #define EXT_DEBUG__
87 :
88 : /*
89 : * Dynamic printk for controlled extents debugging.
90 : */
91 : #ifdef CONFIG_EXT4_DEBUG
92 : #define ext_debug(ino, fmt, ...) \
93 : pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
94 : current->comm, task_pid_nr(current), \
95 : ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
96 : __func__, ##__VA_ARGS__)
97 : #else
98 : #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
99 : #endif
100 :
101 : #define ASSERT(assert) \
102 : do { \
103 : if (unlikely(!(assert))) { \
104 : printk(KERN_EMERG \
105 : "Assertion failure in %s() at %s:%d: '%s'\n", \
106 : __func__, __FILE__, __LINE__, #assert); \
107 : BUG(); \
108 : } \
109 : } while (0)
110 :
111 : /* data type for block offset of block group */
112 : typedef int ext4_grpblk_t;
113 :
114 : /* data type for filesystem-wide blocks number */
115 : typedef unsigned long long ext4_fsblk_t;
116 :
117 : /* data type for file logical block number */
118 : typedef __u32 ext4_lblk_t;
119 :
120 : /* data type for block group number */
121 : typedef unsigned int ext4_group_t;
122 :
123 : enum SHIFT_DIRECTION {
124 : SHIFT_LEFT = 0,
125 : SHIFT_RIGHT,
126 : };
127 :
128 : /*
129 : * Flags used in mballoc's allocation_context flags field.
130 : *
131 : * Also used to show what's going on for debugging purposes when the
132 : * flag field is exported via the traceport interface
133 : */
134 :
135 : /* prefer goal again. length */
136 : #define EXT4_MB_HINT_MERGE 0x0001
137 : /* blocks already reserved */
138 : #define EXT4_MB_HINT_RESERVED 0x0002
139 : /* metadata is being allocated */
140 : #define EXT4_MB_HINT_METADATA 0x0004
141 : /* first blocks in the file */
142 : #define EXT4_MB_HINT_FIRST 0x0008
143 : /* search for the best chunk */
144 : #define EXT4_MB_HINT_BEST 0x0010
145 : /* data is being allocated */
146 : #define EXT4_MB_HINT_DATA 0x0020
147 : /* don't preallocate (for tails) */
148 : #define EXT4_MB_HINT_NOPREALLOC 0x0040
149 : /* allocate for locality group */
150 : #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
151 : /* allocate goal blocks or none */
152 : #define EXT4_MB_HINT_GOAL_ONLY 0x0100
153 : /* goal is meaningful */
154 : #define EXT4_MB_HINT_TRY_GOAL 0x0200
155 : /* blocks already pre-reserved by delayed allocation */
156 : #define EXT4_MB_DELALLOC_RESERVED 0x0400
157 : /* We are doing stream allocation */
158 : #define EXT4_MB_STREAM_ALLOC 0x0800
159 : /* Use reserved root blocks if needed */
160 : #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
161 : /* Use blocks from reserved pool */
162 : #define EXT4_MB_USE_RESERVED 0x2000
163 : /* Do strict check for free blocks while retrying block allocation */
164 : #define EXT4_MB_STRICT_CHECK 0x4000
165 :
166 : struct ext4_allocation_request {
167 : /* target inode for block we're allocating */
168 : struct inode *inode;
169 : /* how many blocks we want to allocate */
170 : unsigned int len;
171 : /* logical block in target inode */
172 : ext4_lblk_t logical;
173 : /* the closest logical allocated block to the left */
174 : ext4_lblk_t lleft;
175 : /* the closest logical allocated block to the right */
176 : ext4_lblk_t lright;
177 : /* phys. target (a hint) */
178 : ext4_fsblk_t goal;
179 : /* phys. block for the closest logical allocated block to the left */
180 : ext4_fsblk_t pleft;
181 : /* phys. block for the closest logical allocated block to the right */
182 : ext4_fsblk_t pright;
183 : /* flags. see above EXT4_MB_HINT_* */
184 : unsigned int flags;
185 : };
186 :
187 : /*
188 : * Logical to physical block mapping, used by ext4_map_blocks()
189 : *
190 : * This structure is used to pass requests into ext4_map_blocks() as
191 : * well as to store the information returned by ext4_map_blocks(). It
192 : * takes less room on the stack than a struct buffer_head.
193 : */
194 : #define EXT4_MAP_NEW BIT(BH_New)
195 : #define EXT4_MAP_MAPPED BIT(BH_Mapped)
196 : #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
197 : #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
198 : #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
199 : EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
200 :
201 : struct ext4_map_blocks {
202 : ext4_fsblk_t m_pblk;
203 : ext4_lblk_t m_lblk;
204 : unsigned int m_len;
205 : unsigned int m_flags;
206 : };
207 :
208 : /*
209 : * Block validity checking, system zone rbtree.
210 : */
211 : struct ext4_system_blocks {
212 : struct rb_root root;
213 : struct rcu_head rcu;
214 : };
215 :
216 : /*
217 : * Flags for ext4_io_end->flags
218 : */
219 : #define EXT4_IO_END_UNWRITTEN 0x0001
220 :
221 : struct ext4_io_end_vec {
222 : struct list_head list; /* list of io_end_vec */
223 : loff_t offset; /* offset in the file */
224 : ssize_t size; /* size of the extent */
225 : };
226 :
227 : /*
228 : * For converting unwritten extents on a work queue. 'handle' is used for
229 : * buffered writeback.
230 : */
231 : typedef struct ext4_io_end {
232 : struct list_head list; /* per-file finished IO list */
233 : handle_t *handle; /* handle reserved for extent
234 : * conversion */
235 : struct inode *inode; /* file being written to */
236 : struct bio *bio; /* Linked list of completed
237 : * bios covering the extent */
238 : unsigned int flag; /* unwritten or not */
239 : atomic_t count; /* reference counter */
240 : struct list_head list_vec; /* list of ext4_io_end_vec */
241 : } ext4_io_end_t;
242 :
243 : struct ext4_io_submit {
244 : struct writeback_control *io_wbc;
245 : struct bio *io_bio;
246 : ext4_io_end_t *io_end;
247 : sector_t io_next_block;
248 : };
249 :
250 : /*
251 : * Special inodes numbers
252 : */
253 : #define EXT4_BAD_INO 1 /* Bad blocks inode */
254 : #define EXT4_ROOT_INO 2 /* Root inode */
255 : #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
256 : #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
257 : #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
258 : #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
259 : #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
260 : #define EXT4_JOURNAL_INO 8 /* Journal inode */
261 :
262 : /* First non-reserved inode for old ext4 filesystems */
263 : #define EXT4_GOOD_OLD_FIRST_INO 11
264 :
265 : /*
266 : * Maximal count of links to a file
267 : */
268 : #define EXT4_LINK_MAX 65000
269 :
270 : /*
271 : * Macro-instructions used to manage several block sizes
272 : */
273 : #define EXT4_MIN_BLOCK_SIZE 1024
274 : #define EXT4_MAX_BLOCK_SIZE 65536
275 : #define EXT4_MIN_BLOCK_LOG_SIZE 10
276 : #define EXT4_MAX_BLOCK_LOG_SIZE 16
277 : #define EXT4_MAX_CLUSTER_LOG_SIZE 30
278 : #ifdef __KERNEL__
279 : # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
280 : #else
281 : # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
282 : #endif
283 : #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
284 : #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
285 : EXT4_SB(s)->s_cluster_bits)
286 : #ifdef __KERNEL__
287 : # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
288 : # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
289 : #else
290 : # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
291 : #endif
292 : #ifdef __KERNEL__
293 : #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
294 : #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
295 : #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
296 : #else
297 : #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
298 : EXT4_GOOD_OLD_INODE_SIZE : \
299 : (s)->s_inode_size)
300 : #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
301 : EXT4_GOOD_OLD_FIRST_INO : \
302 : (s)->s_first_ino)
303 : #endif
304 : #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
305 : #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
306 : ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
307 : blkbits))
308 :
309 : /* Translate a block number to a cluster number */
310 : #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
311 : /* Translate a cluster number to a block number */
312 : #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
313 : /* Translate # of blks to # of clusters */
314 : #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
315 : (sbi)->s_cluster_bits)
316 : /* Mask out the low bits to get the starting block of the cluster */
317 : #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
318 : ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
319 : #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
320 : ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
321 : /* Fill in the low bits to get the last block of the cluster */
322 : #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
323 : ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
324 : /* Get the cluster offset */
325 : #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
326 : ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
327 : #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
328 : ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
329 :
330 : /*
331 : * Structure of a blocks group descriptor
332 : */
333 : struct ext4_group_desc
334 : {
335 : __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
336 : __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
337 : __le32 bg_inode_table_lo; /* Inodes table block */
338 : __le16 bg_free_blocks_count_lo;/* Free blocks count */
339 : __le16 bg_free_inodes_count_lo;/* Free inodes count */
340 : __le16 bg_used_dirs_count_lo; /* Directories count */
341 : __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
342 : __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
343 : __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
344 : __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
345 : __le16 bg_itable_unused_lo; /* Unused inodes count */
346 : __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
347 : __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
348 : __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
349 : __le32 bg_inode_table_hi; /* Inodes table block MSB */
350 : __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
351 : __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
352 : __le16 bg_used_dirs_count_hi; /* Directories count MSB */
353 : __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
354 : __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
355 : __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
356 : __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
357 : __u32 bg_reserved;
358 : };
359 :
360 : #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
361 : (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
362 : sizeof(__le16))
363 : #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
364 : (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
365 : sizeof(__le16))
366 :
367 : /*
368 : * Structure of a flex block group info
369 : */
370 :
371 : struct flex_groups {
372 : atomic64_t free_clusters;
373 : atomic_t free_inodes;
374 : atomic_t used_dirs;
375 : };
376 :
377 : #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
378 : #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
379 : #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
380 :
381 : /*
382 : * Macro-instructions used to manage group descriptors
383 : */
384 : #define EXT4_MIN_DESC_SIZE 32
385 : #define EXT4_MIN_DESC_SIZE_64BIT 64
386 : #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
387 : #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
388 : #ifdef __KERNEL__
389 : # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
390 : # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
391 : # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
392 : # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
393 : # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
394 : #else
395 : # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
396 : # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
397 : # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
398 : #endif
399 :
400 : /*
401 : * Constants relative to the data blocks
402 : */
403 : #define EXT4_NDIR_BLOCKS 12
404 : #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
405 : #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
406 : #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
407 : #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
408 :
409 : /*
410 : * Inode flags
411 : */
412 : #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
413 : #define EXT4_UNRM_FL 0x00000002 /* Undelete */
414 : #define EXT4_COMPR_FL 0x00000004 /* Compress file */
415 : #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
416 : #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
417 : #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
418 : #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
419 : #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
420 : /* Reserved for compression usage... */
421 : #define EXT4_DIRTY_FL 0x00000100
422 : #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
423 : #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
424 : /* nb: was previously EXT2_ECOMPR_FL */
425 : #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
426 : /* End compression flags --- maybe not all used */
427 : #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
428 : #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
429 : #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
430 : #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
431 : #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
432 : #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
433 : #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
434 : #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
435 : #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
436 : #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
437 : /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
438 :
439 : #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
440 :
441 : #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
442 : #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
443 : #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
444 : #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
445 :
446 : /* User modifiable flags */
447 : #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
448 : EXT4_UNRM_FL | \
449 : EXT4_COMPR_FL | \
450 : EXT4_SYNC_FL | \
451 : EXT4_IMMUTABLE_FL | \
452 : EXT4_APPEND_FL | \
453 : EXT4_NODUMP_FL | \
454 : EXT4_NOATIME_FL | \
455 : EXT4_JOURNAL_DATA_FL | \
456 : EXT4_NOTAIL_FL | \
457 : EXT4_DIRSYNC_FL | \
458 : EXT4_TOPDIR_FL | \
459 : EXT4_EXTENTS_FL | \
460 : 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
461 : EXT4_DAX_FL | \
462 : EXT4_PROJINHERIT_FL | \
463 : EXT4_CASEFOLD_FL)
464 :
465 : /* User visible flags */
466 : #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
467 : EXT4_DIRTY_FL | \
468 : EXT4_COMPRBLK_FL | \
469 : EXT4_NOCOMPR_FL | \
470 : EXT4_ENCRYPT_FL | \
471 : EXT4_INDEX_FL | \
472 : EXT4_VERITY_FL | \
473 : EXT4_INLINE_DATA_FL)
474 :
475 : /* Flags we can manipulate with through FS_IOC_FSSETXATTR */
476 : #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
477 : EXT4_IMMUTABLE_FL | \
478 : EXT4_APPEND_FL | \
479 : EXT4_NODUMP_FL | \
480 : EXT4_NOATIME_FL | \
481 : EXT4_PROJINHERIT_FL | \
482 : EXT4_DAX_FL)
483 :
484 : /* Flags that should be inherited by new inodes from their parent. */
485 : #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
486 : EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
487 : EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
488 : EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
489 : EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
490 : EXT4_DAX_FL)
491 :
492 : /* Flags that are appropriate for regular files (all but dir-specific ones). */
493 : #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
494 : EXT4_PROJINHERIT_FL))
495 :
496 : /* Flags that are appropriate for non-directories/regular files. */
497 : #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
498 :
499 : /* The only flags that should be swapped */
500 : #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
501 :
502 : /* Flags which are mutually exclusive to DAX */
503 : #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
504 : EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
505 :
506 : /* Mask out flags that are inappropriate for the given type of inode. */
507 628 : static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
508 : {
509 628 : if (S_ISDIR(mode))
510 : return flags;
511 455 : else if (S_ISREG(mode))
512 455 : return flags & EXT4_REG_FLMASK;
513 : else
514 0 : return flags & EXT4_OTHER_FLMASK;
515 : }
516 :
517 : /*
518 : * Inode flags used for atomic set/get
519 : */
520 : enum {
521 : EXT4_INODE_SECRM = 0, /* Secure deletion */
522 : EXT4_INODE_UNRM = 1, /* Undelete */
523 : EXT4_INODE_COMPR = 2, /* Compress file */
524 : EXT4_INODE_SYNC = 3, /* Synchronous updates */
525 : EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
526 : EXT4_INODE_APPEND = 5, /* writes to file may only append */
527 : EXT4_INODE_NODUMP = 6, /* do not dump file */
528 : EXT4_INODE_NOATIME = 7, /* do not update atime */
529 : /* Reserved for compression usage... */
530 : EXT4_INODE_DIRTY = 8,
531 : EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
532 : EXT4_INODE_NOCOMPR = 10, /* Don't compress */
533 : EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
534 : /* End compression flags --- maybe not all used */
535 : EXT4_INODE_INDEX = 12, /* hash-indexed directory */
536 : EXT4_INODE_IMAGIC = 13, /* AFS directory */
537 : EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
538 : EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
539 : EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
540 : EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
541 : EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
542 : EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
543 : EXT4_INODE_VERITY = 20, /* Verity protected inode */
544 : EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
545 : /* 22 was formerly EXT4_INODE_EOFBLOCKS */
546 : EXT4_INODE_DAX = 25, /* Inode is DAX */
547 : EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
548 : EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
549 : EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
550 : EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
551 : };
552 :
553 : /*
554 : * Since it's pretty easy to mix up bit numbers and hex values, we use a
555 : * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
556 : * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
557 : * any extra space in the compiled kernel image, otherwise, the build will fail.
558 : * It's important that these values are the same, since we are using
559 : * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
560 : * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
561 : * values found in ext2, ext3 and ext4 filesystems, and of course the values
562 : * defined in e2fsprogs.
563 : *
564 : * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
565 : */
566 : #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
567 : #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
568 :
569 1 : static inline void ext4_check_flag_values(void)
570 : {
571 1 : CHECK_FLAG_VALUE(SECRM);
572 1 : CHECK_FLAG_VALUE(UNRM);
573 1 : CHECK_FLAG_VALUE(COMPR);
574 1 : CHECK_FLAG_VALUE(SYNC);
575 1 : CHECK_FLAG_VALUE(IMMUTABLE);
576 1 : CHECK_FLAG_VALUE(APPEND);
577 1 : CHECK_FLAG_VALUE(NODUMP);
578 1 : CHECK_FLAG_VALUE(NOATIME);
579 1 : CHECK_FLAG_VALUE(DIRTY);
580 1 : CHECK_FLAG_VALUE(COMPRBLK);
581 1 : CHECK_FLAG_VALUE(NOCOMPR);
582 1 : CHECK_FLAG_VALUE(ENCRYPT);
583 1 : CHECK_FLAG_VALUE(INDEX);
584 1 : CHECK_FLAG_VALUE(IMAGIC);
585 1 : CHECK_FLAG_VALUE(JOURNAL_DATA);
586 1 : CHECK_FLAG_VALUE(NOTAIL);
587 1 : CHECK_FLAG_VALUE(DIRSYNC);
588 1 : CHECK_FLAG_VALUE(TOPDIR);
589 1 : CHECK_FLAG_VALUE(HUGE_FILE);
590 1 : CHECK_FLAG_VALUE(EXTENTS);
591 1 : CHECK_FLAG_VALUE(VERITY);
592 1 : CHECK_FLAG_VALUE(EA_INODE);
593 1 : CHECK_FLAG_VALUE(INLINE_DATA);
594 1 : CHECK_FLAG_VALUE(PROJINHERIT);
595 1 : CHECK_FLAG_VALUE(CASEFOLD);
596 1 : CHECK_FLAG_VALUE(RESERVED);
597 : }
598 :
599 : /* Used to pass group descriptor data when online resize is done */
600 : struct ext4_new_group_input {
601 : __u32 group; /* Group number for this data */
602 : __u64 block_bitmap; /* Absolute block number of block bitmap */
603 : __u64 inode_bitmap; /* Absolute block number of inode bitmap */
604 : __u64 inode_table; /* Absolute block number of inode table start */
605 : __u32 blocks_count; /* Total number of blocks in this group */
606 : __u16 reserved_blocks; /* Number of reserved blocks in this group */
607 : __u16 unused;
608 : };
609 :
610 : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
611 : struct compat_ext4_new_group_input {
612 : u32 group;
613 : compat_u64 block_bitmap;
614 : compat_u64 inode_bitmap;
615 : compat_u64 inode_table;
616 : u32 blocks_count;
617 : u16 reserved_blocks;
618 : u16 unused;
619 : };
620 : #endif
621 :
622 : /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
623 : struct ext4_new_group_data {
624 : __u32 group;
625 : __u64 block_bitmap;
626 : __u64 inode_bitmap;
627 : __u64 inode_table;
628 : __u32 blocks_count;
629 : __u16 reserved_blocks;
630 : __u16 mdata_blocks;
631 : __u32 free_clusters_count;
632 : };
633 :
634 : /* Indexes used to index group tables in ext4_new_group_data */
635 : enum {
636 : BLOCK_BITMAP = 0, /* block bitmap */
637 : INODE_BITMAP, /* inode bitmap */
638 : INODE_TABLE, /* inode tables */
639 : GROUP_TABLE_COUNT,
640 : };
641 :
642 : /*
643 : * Flags used by ext4_map_blocks()
644 : */
645 : /* Allocate any needed blocks and/or convert an unwritten
646 : extent to be an initialized ext4 */
647 : #define EXT4_GET_BLOCKS_CREATE 0x0001
648 : /* Request the creation of an unwritten extent */
649 : #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
650 : #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
651 : EXT4_GET_BLOCKS_CREATE)
652 : /* Caller is from the delayed allocation writeout path
653 : * finally doing the actual allocation of delayed blocks */
654 : #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
655 : /* caller is from the direct IO path, request to creation of an
656 : unwritten extents if not allocated, split the unwritten
657 : extent if blocks has been preallocated already*/
658 : #define EXT4_GET_BLOCKS_PRE_IO 0x0008
659 : #define EXT4_GET_BLOCKS_CONVERT 0x0010
660 : #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
661 : EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
662 : /* Convert extent to initialized after IO complete */
663 : #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
664 : EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
665 : /* Eventual metadata allocation (due to growing extent tree)
666 : * should not fail, so try to use reserved blocks for that.*/
667 : #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
668 : /* Don't normalize allocation size (used for fallocate) */
669 : #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
670 : /* Convert written extents to unwritten */
671 : #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
672 : /* Write zeros to newly created written extents */
673 : #define EXT4_GET_BLOCKS_ZERO 0x0200
674 : #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
675 : EXT4_GET_BLOCKS_ZERO)
676 : /* Caller will submit data before dropping transaction handle. This
677 : * allows jbd2 to avoid submitting data before commit. */
678 : #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
679 :
680 : /*
681 : * The bit position of these flags must not overlap with any of the
682 : * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
683 : * read_extent_tree_block(), ext4_split_extent_at(),
684 : * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
685 : * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
686 : * caching the extents when reading from the extent tree while a
687 : * truncate or punch hole operation is in progress.
688 : */
689 : #define EXT4_EX_NOCACHE 0x40000000
690 : #define EXT4_EX_FORCE_CACHE 0x20000000
691 : #define EXT4_EX_NOFAIL 0x10000000
692 :
693 : /*
694 : * Flags used by ext4_free_blocks
695 : */
696 : #define EXT4_FREE_BLOCKS_METADATA 0x0001
697 : #define EXT4_FREE_BLOCKS_FORGET 0x0002
698 : #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
699 : #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
700 : #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
701 : #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
702 : #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
703 :
704 : /*
705 : * ioctl commands
706 : */
707 : #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
708 : #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
709 : #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
710 : #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
711 : #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
712 : #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
713 : #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
714 : #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
715 : #define EXT4_IOC_MIGRATE _IO('f', 9)
716 : /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
717 : /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
718 : #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
719 : #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
720 : #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
721 : #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
722 : #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
723 : /* ioctl codes 19--39 are reserved for fscrypt */
724 : #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
725 : #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
726 : #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
727 :
728 : #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
729 :
730 : /*
731 : * Flags for going down operation
732 : */
733 : #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
734 : #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
735 : #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
736 :
737 : /*
738 : * Flags returned by EXT4_IOC_GETSTATE
739 : *
740 : * We only expose to userspace a subset of the state flags in
741 : * i_state_flags
742 : */
743 : #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
744 : #define EXT4_STATE_FLAG_NEW 0x00000002
745 : #define EXT4_STATE_FLAG_NEWENTRY 0x00000004
746 : #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
747 :
748 : #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
749 : /*
750 : * ioctl commands in 32 bit emulation
751 : */
752 : #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
753 : #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
754 : #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
755 : #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
756 : #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
757 : #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
758 : #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
759 : #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
760 : #endif
761 :
762 : /*
763 : * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
764 : * It indicates that the entry in extent status cache is for a hole.
765 : */
766 : #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
767 :
768 : /* Max physical block we can address w/o extents */
769 : #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
770 :
771 : /* Max logical block we can support */
772 : #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
773 :
774 : /*
775 : * Structure of an inode on the disk
776 : */
777 : struct ext4_inode {
778 : __le16 i_mode; /* File mode */
779 : __le16 i_uid; /* Low 16 bits of Owner Uid */
780 : __le32 i_size_lo; /* Size in bytes */
781 : __le32 i_atime; /* Access time */
782 : __le32 i_ctime; /* Inode Change time */
783 : __le32 i_mtime; /* Modification time */
784 : __le32 i_dtime; /* Deletion Time */
785 : __le16 i_gid; /* Low 16 bits of Group Id */
786 : __le16 i_links_count; /* Links count */
787 : __le32 i_blocks_lo; /* Blocks count */
788 : __le32 i_flags; /* File flags */
789 : union {
790 : struct {
791 : __le32 l_i_version;
792 : } linux1;
793 : struct {
794 : __u32 h_i_translator;
795 : } hurd1;
796 : struct {
797 : __u32 m_i_reserved1;
798 : } masix1;
799 : } osd1; /* OS dependent 1 */
800 : __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
801 : __le32 i_generation; /* File version (for NFS) */
802 : __le32 i_file_acl_lo; /* File ACL */
803 : __le32 i_size_high;
804 : __le32 i_obso_faddr; /* Obsoleted fragment address */
805 : union {
806 : struct {
807 : __le16 l_i_blocks_high; /* were l_i_reserved1 */
808 : __le16 l_i_file_acl_high;
809 : __le16 l_i_uid_high; /* these 2 fields */
810 : __le16 l_i_gid_high; /* were reserved2[0] */
811 : __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
812 : __le16 l_i_reserved;
813 : } linux2;
814 : struct {
815 : __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
816 : __u16 h_i_mode_high;
817 : __u16 h_i_uid_high;
818 : __u16 h_i_gid_high;
819 : __u32 h_i_author;
820 : } hurd2;
821 : struct {
822 : __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
823 : __le16 m_i_file_acl_high;
824 : __u32 m_i_reserved2[2];
825 : } masix2;
826 : } osd2; /* OS dependent 2 */
827 : __le16 i_extra_isize;
828 : __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
829 : __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
830 : __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
831 : __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
832 : __le32 i_crtime; /* File Creation time */
833 : __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
834 : __le32 i_version_hi; /* high 32 bits for 64-bit version */
835 : __le32 i_projid; /* Project ID */
836 : };
837 :
838 : struct move_extent {
839 : __u32 reserved; /* should be zero */
840 : __u32 donor_fd; /* donor file descriptor */
841 : __u64 orig_start; /* logical start offset in block for orig */
842 : __u64 donor_start; /* logical start offset in block for donor */
843 : __u64 len; /* block length to be moved */
844 : __u64 moved_len; /* moved block length */
845 : };
846 :
847 : #define EXT4_EPOCH_BITS 2
848 : #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
849 : #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
850 :
851 : /*
852 : * Extended fields will fit into an inode if the filesystem was formatted
853 : * with large inodes (-I 256 or larger) and there are not currently any EAs
854 : * consuming all of the available space. For new inodes we always reserve
855 : * enough space for the kernel's known extended fields, but for inodes
856 : * created with an old kernel this might not have been the case. None of
857 : * the extended inode fields is critical for correct filesystem operation.
858 : * This macro checks if a certain field fits in the inode. Note that
859 : * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
860 : */
861 : #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
862 : ((offsetof(typeof(*ext4_inode), field) + \
863 : sizeof((ext4_inode)->field)) \
864 : <= (EXT4_GOOD_OLD_INODE_SIZE + \
865 : (einode)->i_extra_isize)) \
866 :
867 : /*
868 : * We use an encoding that preserves the times for extra epoch "00":
869 : *
870 : * extra msb of adjust for signed
871 : * epoch 32-bit 32-bit tv_sec to
872 : * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
873 : * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
874 : * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
875 : * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
876 : * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
877 : * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
878 : * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
879 : * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
880 : * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
881 : *
882 : * Note that previous versions of the kernel on 64-bit systems would
883 : * incorrectly use extra epoch bits 1,1 for dates between 1901 and
884 : * 1970. e2fsck will correct this, assuming that it is run on the
885 : * affected filesystem before 2242.
886 : */
887 :
888 41731 : static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
889 : {
890 41731 : u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
891 41731 : return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
892 : }
893 :
894 19740 : static inline void ext4_decode_extra_time(struct timespec64 *time,
895 : __le32 extra)
896 : {
897 19740 : if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
898 0 : time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
899 19740 : time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
900 19740 : }
901 :
902 : #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
903 : do { \
904 : if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
905 : (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
906 : (raw_inode)->xtime ## _extra = \
907 : ext4_encode_extra_time(&(inode)->xtime); \
908 : } \
909 : else \
910 : (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
911 : } while (0)
912 :
913 : #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
914 : do { \
915 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
916 : (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
917 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
918 : (raw_inode)->xtime ## _extra = \
919 : ext4_encode_extra_time(&(einode)->xtime); \
920 : } while (0)
921 :
922 : #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
923 : do { \
924 : (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
925 : if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
926 : ext4_decode_extra_time(&(inode)->xtime, \
927 : raw_inode->xtime ## _extra); \
928 : } \
929 : else \
930 : (inode)->xtime.tv_nsec = 0; \
931 : } while (0)
932 :
933 :
934 : #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
935 : do { \
936 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
937 : (einode)->xtime.tv_sec = \
938 : (signed)le32_to_cpu((raw_inode)->xtime); \
939 : else \
940 : (einode)->xtime.tv_sec = 0; \
941 : if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
942 : ext4_decode_extra_time(&(einode)->xtime, \
943 : raw_inode->xtime ## _extra); \
944 : else \
945 : (einode)->xtime.tv_nsec = 0; \
946 : } while (0)
947 :
948 : #define i_disk_version osd1.linux1.l_i_version
949 :
950 : #if defined(__KERNEL__) || defined(__linux__)
951 : #define i_reserved1 osd1.linux1.l_i_reserved1
952 : #define i_file_acl_high osd2.linux2.l_i_file_acl_high
953 : #define i_blocks_high osd2.linux2.l_i_blocks_high
954 : #define i_uid_low i_uid
955 : #define i_gid_low i_gid
956 : #define i_uid_high osd2.linux2.l_i_uid_high
957 : #define i_gid_high osd2.linux2.l_i_gid_high
958 : #define i_checksum_lo osd2.linux2.l_i_checksum_lo
959 :
960 : #elif defined(__GNU__)
961 :
962 : #define i_translator osd1.hurd1.h_i_translator
963 : #define i_uid_high osd2.hurd2.h_i_uid_high
964 : #define i_gid_high osd2.hurd2.h_i_gid_high
965 : #define i_author osd2.hurd2.h_i_author
966 :
967 : #elif defined(__masix__)
968 :
969 : #define i_reserved1 osd1.masix1.m_i_reserved1
970 : #define i_file_acl_high osd2.masix2.m_i_file_acl_high
971 : #define i_reserved2 osd2.masix2.m_i_reserved2
972 :
973 : #endif /* defined(__KERNEL__) || defined(__linux__) */
974 :
975 : #include "extents_status.h"
976 : #include "fast_commit.h"
977 :
978 : /*
979 : * Lock subclasses for i_data_sem in the ext4_inode_info structure.
980 : *
981 : * These are needed to avoid lockdep false positives when we need to
982 : * allocate blocks to the quota inode during ext4_map_blocks(), while
983 : * holding i_data_sem for a normal (non-quota) inode. Since we don't
984 : * do quota tracking for the quota inode, this avoids deadlock (as
985 : * well as infinite recursion, since it isn't turtles all the way
986 : * down...)
987 : *
988 : * I_DATA_SEM_NORMAL - Used for most inodes
989 : * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
990 : * where the second inode has larger inode number
991 : * than the first
992 : * I_DATA_SEM_QUOTA - Used for quota inodes only
993 : */
994 : enum {
995 : I_DATA_SEM_NORMAL = 0,
996 : I_DATA_SEM_OTHER,
997 : I_DATA_SEM_QUOTA,
998 : };
999 :
1000 :
1001 : /*
1002 : * fourth extended file system inode data in memory
1003 : */
1004 : struct ext4_inode_info {
1005 : __le32 i_data[15]; /* unconverted */
1006 : __u32 i_dtime;
1007 : ext4_fsblk_t i_file_acl;
1008 :
1009 : /*
1010 : * i_block_group is the number of the block group which contains
1011 : * this file's inode. Constant across the lifetime of the inode,
1012 : * it is used for making block allocation decisions - we try to
1013 : * place a file's data blocks near its inode block, and new inodes
1014 : * near to their parent directory's inode.
1015 : */
1016 : ext4_group_t i_block_group;
1017 : ext4_lblk_t i_dir_start_lookup;
1018 : #if (BITS_PER_LONG < 64)
1019 : unsigned long i_state_flags; /* Dynamic state flags */
1020 : #endif
1021 : unsigned long i_flags;
1022 :
1023 : /*
1024 : * Extended attributes can be read independently of the main file
1025 : * data. Taking i_mutex even when reading would cause contention
1026 : * between readers of EAs and writers of regular file data, so
1027 : * instead we synchronize on xattr_sem when reading or changing
1028 : * EAs.
1029 : */
1030 : struct rw_semaphore xattr_sem;
1031 :
1032 : struct list_head i_orphan; /* unlinked but open inodes */
1033 :
1034 : /* Fast commit related info */
1035 :
1036 : struct list_head i_fc_list; /*
1037 : * inodes that need fast commit
1038 : * protected by sbi->s_fc_lock.
1039 : */
1040 :
1041 : /* Start of lblk range that needs to be committed in this fast commit */
1042 : ext4_lblk_t i_fc_lblk_start;
1043 :
1044 : /* End of lblk range that needs to be committed in this fast commit */
1045 : ext4_lblk_t i_fc_lblk_len;
1046 :
1047 : /* Number of ongoing updates on this inode */
1048 : atomic_t i_fc_updates;
1049 :
1050 : /* Fast commit wait queue for this inode */
1051 : wait_queue_head_t i_fc_wait;
1052 :
1053 : /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1054 : struct mutex i_fc_lock;
1055 :
1056 : /*
1057 : * i_disksize keeps track of what the inode size is ON DISK, not
1058 : * in memory. During truncate, i_size is set to the new size by
1059 : * the VFS prior to calling ext4_truncate(), but the filesystem won't
1060 : * set i_disksize to 0 until the truncate is actually under way.
1061 : *
1062 : * The intent is that i_disksize always represents the blocks which
1063 : * are used by this file. This allows recovery to restart truncate
1064 : * on orphans if we crash during truncate. We actually write i_disksize
1065 : * into the on-disk inode when writing inodes out, instead of i_size.
1066 : *
1067 : * The only time when i_disksize and i_size may be different is when
1068 : * a truncate is in progress. The only things which change i_disksize
1069 : * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1070 : */
1071 : loff_t i_disksize;
1072 :
1073 : /*
1074 : * i_data_sem is for serialising ext4_truncate() against
1075 : * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1076 : * data tree are chopped off during truncate. We can't do that in
1077 : * ext4 because whenever we perform intermediate commits during
1078 : * truncate, the inode and all the metadata blocks *must* be in a
1079 : * consistent state which allows truncation of the orphans to restart
1080 : * during recovery. Hence we must fix the get_block-vs-truncate race
1081 : * by other means, so we have i_data_sem.
1082 : */
1083 : struct rw_semaphore i_data_sem;
1084 : /*
1085 : * i_mmap_sem is for serializing page faults with truncate / punch hole
1086 : * operations. We have to make sure that new page cannot be faulted in
1087 : * a section of the inode that is being punched. We cannot easily use
1088 : * i_data_sem for this since we need protection for the whole punch
1089 : * operation and i_data_sem ranks below transaction start so we have
1090 : * to occasionally drop it.
1091 : */
1092 : struct rw_semaphore i_mmap_sem;
1093 : struct inode vfs_inode;
1094 : struct jbd2_inode *jinode;
1095 :
1096 : spinlock_t i_raw_lock; /* protects updates to the raw inode */
1097 :
1098 : /*
1099 : * File creation time. Its function is same as that of
1100 : * struct timespec64 i_{a,c,m}time in the generic inode.
1101 : */
1102 : struct timespec64 i_crtime;
1103 :
1104 : /* mballoc */
1105 : atomic_t i_prealloc_active;
1106 : struct list_head i_prealloc_list;
1107 : spinlock_t i_prealloc_lock;
1108 :
1109 : /* extents status tree */
1110 : struct ext4_es_tree i_es_tree;
1111 : rwlock_t i_es_lock;
1112 : struct list_head i_es_list;
1113 : unsigned int i_es_all_nr; /* protected by i_es_lock */
1114 : unsigned int i_es_shk_nr; /* protected by i_es_lock */
1115 : ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1116 : extents to shrink. Protected by
1117 : i_es_lock */
1118 :
1119 : /* ialloc */
1120 : ext4_group_t i_last_alloc_group;
1121 :
1122 : /* allocation reservation info for delalloc */
1123 : /* In case of bigalloc, this refer to clusters rather than blocks */
1124 : unsigned int i_reserved_data_blocks;
1125 :
1126 : /* pending cluster reservations for bigalloc file systems */
1127 : struct ext4_pending_tree i_pending_tree;
1128 :
1129 : /* on-disk additional length */
1130 : __u16 i_extra_isize;
1131 :
1132 : /* Indicate the inline data space. */
1133 : u16 i_inline_off;
1134 : u16 i_inline_size;
1135 :
1136 : #ifdef CONFIG_QUOTA
1137 : /* quota space reservation, managed internally by quota code */
1138 : qsize_t i_reserved_quota;
1139 : #endif
1140 :
1141 : /* Lock protecting lists below */
1142 : spinlock_t i_completed_io_lock;
1143 : /*
1144 : * Completed IOs that need unwritten extents handling and have
1145 : * transaction reserved
1146 : */
1147 : struct list_head i_rsv_conversion_list;
1148 : struct work_struct i_rsv_conversion_work;
1149 : atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1150 :
1151 : spinlock_t i_block_reservation_lock;
1152 :
1153 : /*
1154 : * Transactions that contain inode's metadata needed to complete
1155 : * fsync and fdatasync, respectively.
1156 : */
1157 : tid_t i_sync_tid;
1158 : tid_t i_datasync_tid;
1159 :
1160 : #ifdef CONFIG_QUOTA
1161 : struct dquot *i_dquot[MAXQUOTAS];
1162 : #endif
1163 :
1164 : /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1165 : __u32 i_csum_seed;
1166 :
1167 : kprojid_t i_projid;
1168 : };
1169 :
1170 : /*
1171 : * File system states
1172 : */
1173 : #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1174 : #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1175 : #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1176 : #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1177 :
1178 : /*
1179 : * Misc. filesystem flags
1180 : */
1181 : #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1182 : #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1183 : #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1184 :
1185 : /*
1186 : * Mount flags set via mount options or defaults
1187 : */
1188 : #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1189 : #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1190 : #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1191 : #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1192 : #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1193 : #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1194 : #define EXT4_MOUNT_ERRORS_MASK 0x00070
1195 : #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1196 : #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1197 : #ifdef CONFIG_FS_DAX
1198 : #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1199 : #else
1200 : #define EXT4_MOUNT_DAX_ALWAYS 0
1201 : #endif
1202 : #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1203 : #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1204 : #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1205 : #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1206 : #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1207 : #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1208 : #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1209 : #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1210 : #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1211 : #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1212 : #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1213 : #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1214 : * enable enforcement for hidden
1215 : * quota files */
1216 : #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1217 : * enforcement for hidden quota
1218 : * files */
1219 : #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1220 : * enforcement */
1221 : #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1222 : #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1223 : #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1224 : #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1225 : #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
1226 : #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1227 : #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1228 : #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1229 : #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1230 : #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1231 :
1232 : /*
1233 : * Mount flags set either automatically (could not be set by mount option)
1234 : * based on per file system feature or property or in special cases such as
1235 : * distinguishing between explicit mount option definition and default.
1236 : */
1237 : #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1238 : specified delalloc */
1239 : #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1240 : size of blocksize * 8
1241 : blocks */
1242 : #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1243 : file systems */
1244 : #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1245 : specified journal checksum */
1246 :
1247 : #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1248 : #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1249 : #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1250 :
1251 :
1252 : #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1253 : ~EXT4_MOUNT_##opt
1254 : #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1255 : EXT4_MOUNT_##opt
1256 : #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1257 : EXT4_MOUNT_##opt)
1258 :
1259 : #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1260 : ~EXT4_MOUNT2_##opt
1261 : #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1262 : EXT4_MOUNT2_##opt
1263 : #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1264 : EXT4_MOUNT2_##opt)
1265 :
1266 : #define ext4_test_and_set_bit __test_and_set_bit_le
1267 : #define ext4_set_bit __set_bit_le
1268 : #define ext4_set_bit_atomic ext2_set_bit_atomic
1269 : #define ext4_test_and_clear_bit __test_and_clear_bit_le
1270 : #define ext4_clear_bit __clear_bit_le
1271 : #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1272 : #define ext4_test_bit test_bit_le
1273 : #define ext4_find_next_zero_bit find_next_zero_bit_le
1274 : #define ext4_find_next_bit find_next_bit_le
1275 :
1276 : extern void ext4_set_bits(void *bm, int cur, int len);
1277 :
1278 : /*
1279 : * Maximal mount counts between two filesystem checks
1280 : */
1281 : #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1282 : #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1283 :
1284 : /*
1285 : * Behaviour when detecting errors
1286 : */
1287 : #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1288 : #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1289 : #define EXT4_ERRORS_PANIC 3 /* Panic */
1290 : #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1291 :
1292 : /* Metadata checksum algorithm codes */
1293 : #define EXT4_CRC32C_CHKSUM 1
1294 :
1295 : /*
1296 : * Structure of the super block
1297 : */
1298 : struct ext4_super_block {
1299 : /*00*/ __le32 s_inodes_count; /* Inodes count */
1300 : __le32 s_blocks_count_lo; /* Blocks count */
1301 : __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1302 : __le32 s_free_blocks_count_lo; /* Free blocks count */
1303 : /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1304 : __le32 s_first_data_block; /* First Data Block */
1305 : __le32 s_log_block_size; /* Block size */
1306 : __le32 s_log_cluster_size; /* Allocation cluster size */
1307 : /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1308 : __le32 s_clusters_per_group; /* # Clusters per group */
1309 : __le32 s_inodes_per_group; /* # Inodes per group */
1310 : __le32 s_mtime; /* Mount time */
1311 : /*30*/ __le32 s_wtime; /* Write time */
1312 : __le16 s_mnt_count; /* Mount count */
1313 : __le16 s_max_mnt_count; /* Maximal mount count */
1314 : __le16 s_magic; /* Magic signature */
1315 : __le16 s_state; /* File system state */
1316 : __le16 s_errors; /* Behaviour when detecting errors */
1317 : __le16 s_minor_rev_level; /* minor revision level */
1318 : /*40*/ __le32 s_lastcheck; /* time of last check */
1319 : __le32 s_checkinterval; /* max. time between checks */
1320 : __le32 s_creator_os; /* OS */
1321 : __le32 s_rev_level; /* Revision level */
1322 : /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1323 : __le16 s_def_resgid; /* Default gid for reserved blocks */
1324 : /*
1325 : * These fields are for EXT4_DYNAMIC_REV superblocks only.
1326 : *
1327 : * Note: the difference between the compatible feature set and
1328 : * the incompatible feature set is that if there is a bit set
1329 : * in the incompatible feature set that the kernel doesn't
1330 : * know about, it should refuse to mount the filesystem.
1331 : *
1332 : * e2fsck's requirements are more strict; if it doesn't know
1333 : * about a feature in either the compatible or incompatible
1334 : * feature set, it must abort and not try to meddle with
1335 : * things it doesn't understand...
1336 : */
1337 : __le32 s_first_ino; /* First non-reserved inode */
1338 : __le16 s_inode_size; /* size of inode structure */
1339 : __le16 s_block_group_nr; /* block group # of this superblock */
1340 : __le32 s_feature_compat; /* compatible feature set */
1341 : /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1342 : __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1343 : /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1344 : /*78*/ char s_volume_name[16]; /* volume name */
1345 : /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1346 : /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1347 : /*
1348 : * Performance hints. Directory preallocation should only
1349 : * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1350 : */
1351 : __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1352 : __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1353 : __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1354 : /*
1355 : * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1356 : */
1357 : /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1358 : /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1359 : __le32 s_journal_dev; /* device number of journal file */
1360 : __le32 s_last_orphan; /* start of list of inodes to delete */
1361 : __le32 s_hash_seed[4]; /* HTREE hash seed */
1362 : __u8 s_def_hash_version; /* Default hash version to use */
1363 : __u8 s_jnl_backup_type;
1364 : __le16 s_desc_size; /* size of group descriptor */
1365 : /*100*/ __le32 s_default_mount_opts;
1366 : __le32 s_first_meta_bg; /* First metablock block group */
1367 : __le32 s_mkfs_time; /* When the filesystem was created */
1368 : __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1369 : /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1370 : /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1371 : __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1372 : __le32 s_free_blocks_count_hi; /* Free blocks count */
1373 : __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1374 : __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1375 : __le32 s_flags; /* Miscellaneous flags */
1376 : __le16 s_raid_stride; /* RAID stride */
1377 : __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1378 : __le64 s_mmp_block; /* Block for multi-mount protection */
1379 : __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1380 : __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1381 : __u8 s_checksum_type; /* metadata checksum algorithm used */
1382 : __u8 s_encryption_level; /* versioning level for encryption */
1383 : __u8 s_reserved_pad; /* Padding to next 32bits */
1384 : __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1385 : __le32 s_snapshot_inum; /* Inode number of active snapshot */
1386 : __le32 s_snapshot_id; /* sequential ID of active snapshot */
1387 : __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1388 : snapshot's future use */
1389 : __le32 s_snapshot_list; /* inode number of the head of the
1390 : on-disk snapshot list */
1391 : #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1392 : __le32 s_error_count; /* number of fs errors */
1393 : __le32 s_first_error_time; /* first time an error happened */
1394 : __le32 s_first_error_ino; /* inode involved in first error */
1395 : __le64 s_first_error_block; /* block involved of first error */
1396 : __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1397 : __le32 s_first_error_line; /* line number where error happened */
1398 : __le32 s_last_error_time; /* most recent time of an error */
1399 : __le32 s_last_error_ino; /* inode involved in last error */
1400 : __le32 s_last_error_line; /* line number where error happened */
1401 : __le64 s_last_error_block; /* block involved of last error */
1402 : __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1403 : #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1404 : __u8 s_mount_opts[64];
1405 : __le32 s_usr_quota_inum; /* inode for tracking user quota */
1406 : __le32 s_grp_quota_inum; /* inode for tracking group quota */
1407 : __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1408 : __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1409 : __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1410 : __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1411 : __le32 s_lpf_ino; /* Location of the lost+found inode */
1412 : __le32 s_prj_quota_inum; /* inode for tracking project quota */
1413 : __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1414 : __u8 s_wtime_hi;
1415 : __u8 s_mtime_hi;
1416 : __u8 s_mkfs_time_hi;
1417 : __u8 s_lastcheck_hi;
1418 : __u8 s_first_error_time_hi;
1419 : __u8 s_last_error_time_hi;
1420 : __u8 s_first_error_errcode;
1421 : __u8 s_last_error_errcode;
1422 : __le16 s_encoding; /* Filename charset encoding */
1423 : __le16 s_encoding_flags; /* Filename charset encoding flags */
1424 : __le32 s_reserved[95]; /* Padding to the end of the block */
1425 : __le32 s_checksum; /* crc32c(superblock) */
1426 : };
1427 :
1428 : #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1429 :
1430 : #ifdef __KERNEL__
1431 :
1432 : #ifdef CONFIG_FS_ENCRYPTION
1433 : #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1434 : #else
1435 : #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1436 : #endif
1437 :
1438 : /* Number of quota types we support */
1439 : #define EXT4_MAXQUOTAS 3
1440 :
1441 : #define EXT4_ENC_UTF8_12_1 1
1442 :
1443 : /*
1444 : * fourth extended-fs super-block data in memory
1445 : */
1446 : struct ext4_sb_info {
1447 : unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1448 : unsigned long s_inodes_per_block;/* Number of inodes per block */
1449 : unsigned long s_blocks_per_group;/* Number of blocks in a group */
1450 : unsigned long s_clusters_per_group; /* Number of clusters in a group */
1451 : unsigned long s_inodes_per_group;/* Number of inodes in a group */
1452 : unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1453 : unsigned long s_gdb_count; /* Number of group descriptor blocks */
1454 : unsigned long s_desc_per_block; /* Number of group descriptors per block */
1455 : ext4_group_t s_groups_count; /* Number of groups in the fs */
1456 : ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1457 : unsigned long s_overhead; /* # of fs overhead clusters */
1458 : unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1459 : unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1460 : loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1461 : struct buffer_head * s_sbh; /* Buffer containing the super block */
1462 : struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1463 : struct buffer_head * __rcu *s_group_desc;
1464 : unsigned int s_mount_opt;
1465 : unsigned int s_mount_opt2;
1466 : unsigned long s_mount_flags;
1467 : unsigned int s_def_mount_opt;
1468 : ext4_fsblk_t s_sb_block;
1469 : atomic64_t s_resv_clusters;
1470 : kuid_t s_resuid;
1471 : kgid_t s_resgid;
1472 : unsigned short s_mount_state;
1473 : unsigned short s_pad;
1474 : int s_addr_per_block_bits;
1475 : int s_desc_per_block_bits;
1476 : int s_inode_size;
1477 : int s_first_ino;
1478 : unsigned int s_inode_readahead_blks;
1479 : unsigned int s_inode_goal;
1480 : u32 s_hash_seed[4];
1481 : int s_def_hash_version;
1482 : int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1483 : struct percpu_counter s_freeclusters_counter;
1484 : struct percpu_counter s_freeinodes_counter;
1485 : struct percpu_counter s_dirs_counter;
1486 : struct percpu_counter s_dirtyclusters_counter;
1487 : struct blockgroup_lock *s_blockgroup_lock;
1488 : struct proc_dir_entry *s_proc;
1489 : struct kobject s_kobj;
1490 : struct completion s_kobj_unregister;
1491 : struct super_block *s_sb;
1492 :
1493 : /* Journaling */
1494 : struct journal_s *s_journal;
1495 : struct list_head s_orphan;
1496 : struct mutex s_orphan_lock;
1497 : unsigned long s_ext4_flags; /* Ext4 superblock flags */
1498 : unsigned long s_commit_interval;
1499 : u32 s_max_batch_time;
1500 : u32 s_min_batch_time;
1501 : struct block_device *s_journal_bdev;
1502 : #ifdef CONFIG_QUOTA
1503 : /* Names of quota files with journalled quota */
1504 : char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1505 : int s_jquota_fmt; /* Format of quota to use */
1506 : #endif
1507 : unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1508 : struct ext4_system_blocks __rcu *s_system_blks;
1509 :
1510 : #ifdef EXTENTS_STATS
1511 : /* ext4 extents stats */
1512 : unsigned long s_ext_min;
1513 : unsigned long s_ext_max;
1514 : unsigned long s_depth_max;
1515 : spinlock_t s_ext_stats_lock;
1516 : unsigned long s_ext_blocks;
1517 : unsigned long s_ext_extents;
1518 : #endif
1519 :
1520 : /* for buddy allocator */
1521 : struct ext4_group_info ** __rcu *s_group_info;
1522 : struct inode *s_buddy_cache;
1523 : spinlock_t s_md_lock;
1524 : unsigned short *s_mb_offsets;
1525 : unsigned int *s_mb_maxs;
1526 : unsigned int s_group_info_size;
1527 : unsigned int s_mb_free_pending;
1528 : struct list_head s_freed_data_list; /* List of blocks to be freed
1529 : after commit completed */
1530 :
1531 : /* tunables */
1532 : unsigned long s_stripe;
1533 : unsigned int s_mb_stream_request;
1534 : unsigned int s_mb_max_to_scan;
1535 : unsigned int s_mb_min_to_scan;
1536 : unsigned int s_mb_stats;
1537 : unsigned int s_mb_order2_reqs;
1538 : unsigned int s_mb_group_prealloc;
1539 : unsigned int s_mb_max_inode_prealloc;
1540 : unsigned int s_max_dir_size_kb;
1541 : /* where last allocation was done - for stream allocation */
1542 : unsigned long s_mb_last_group;
1543 : unsigned long s_mb_last_start;
1544 : unsigned int s_mb_prefetch;
1545 : unsigned int s_mb_prefetch_limit;
1546 :
1547 : /* stats for buddy allocator */
1548 : atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1549 : atomic_t s_bal_success; /* we found long enough chunks */
1550 : atomic_t s_bal_allocated; /* in blocks */
1551 : atomic_t s_bal_ex_scanned; /* total extents scanned */
1552 : atomic_t s_bal_goals; /* goal hits */
1553 : atomic_t s_bal_breaks; /* too long searches */
1554 : atomic_t s_bal_2orders; /* 2^order hits */
1555 : spinlock_t s_bal_lock;
1556 : unsigned long s_mb_buddies_generated;
1557 : unsigned long long s_mb_generation_time;
1558 : atomic_t s_mb_lost_chunks;
1559 : atomic_t s_mb_preallocated;
1560 : atomic_t s_mb_discarded;
1561 : atomic_t s_lock_busy;
1562 :
1563 : /* locality groups */
1564 : struct ext4_locality_group __percpu *s_locality_groups;
1565 :
1566 : /* for write statistics */
1567 : unsigned long s_sectors_written_start;
1568 : u64 s_kbytes_written;
1569 :
1570 : /* the size of zero-out chunk */
1571 : unsigned int s_extent_max_zeroout_kb;
1572 :
1573 : unsigned int s_log_groups_per_flex;
1574 : struct flex_groups * __rcu *s_flex_groups;
1575 : ext4_group_t s_flex_groups_allocated;
1576 :
1577 : /* workqueue for reserved extent conversions (buffered io) */
1578 : struct workqueue_struct *rsv_conversion_wq;
1579 :
1580 : /* timer for periodic error stats printing */
1581 : struct timer_list s_err_report;
1582 :
1583 : /* Lazy inode table initialization info */
1584 : struct ext4_li_request *s_li_request;
1585 : /* Wait multiplier for lazy initialization thread */
1586 : unsigned int s_li_wait_mult;
1587 :
1588 : /* Kernel thread for multiple mount protection */
1589 : struct task_struct *s_mmp_tsk;
1590 :
1591 : /* record the last minlen when FITRIM is called. */
1592 : atomic_t s_last_trim_minblks;
1593 :
1594 : /* Reference to checksum algorithm driver via cryptoapi */
1595 : struct crypto_shash *s_chksum_driver;
1596 :
1597 : /* Precomputed FS UUID checksum for seeding other checksums */
1598 : __u32 s_csum_seed;
1599 :
1600 : /* Reclaim extents from extent status tree */
1601 : struct shrinker s_es_shrinker;
1602 : struct list_head s_es_list; /* List of inodes with reclaimable extents */
1603 : long s_es_nr_inode;
1604 : struct ext4_es_stats s_es_stats;
1605 : struct mb_cache *s_ea_block_cache;
1606 : struct mb_cache *s_ea_inode_cache;
1607 : spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1608 :
1609 : /* Ratelimit ext4 messages. */
1610 : struct ratelimit_state s_err_ratelimit_state;
1611 : struct ratelimit_state s_warning_ratelimit_state;
1612 : struct ratelimit_state s_msg_ratelimit_state;
1613 : atomic_t s_warning_count;
1614 : atomic_t s_msg_count;
1615 :
1616 : /* Encryption policy for '-o test_dummy_encryption' */
1617 : struct fscrypt_dummy_policy s_dummy_enc_policy;
1618 :
1619 : /*
1620 : * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1621 : * or EXTENTS flag.
1622 : */
1623 : struct percpu_rw_semaphore s_writepages_rwsem;
1624 : struct dax_device *s_daxdev;
1625 : #ifdef CONFIG_EXT4_DEBUG
1626 : unsigned long s_simulate_fail;
1627 : #endif
1628 : /* Record the errseq of the backing block device */
1629 : errseq_t s_bdev_wb_err;
1630 : spinlock_t s_bdev_wb_lock;
1631 :
1632 : /* Information about errors that happened during this mount */
1633 : spinlock_t s_error_lock;
1634 : int s_add_error_count;
1635 : int s_first_error_code;
1636 : __u32 s_first_error_line;
1637 : __u32 s_first_error_ino;
1638 : __u64 s_first_error_block;
1639 : const char *s_first_error_func;
1640 : time64_t s_first_error_time;
1641 : int s_last_error_code;
1642 : __u32 s_last_error_line;
1643 : __u32 s_last_error_ino;
1644 : __u64 s_last_error_block;
1645 : const char *s_last_error_func;
1646 : time64_t s_last_error_time;
1647 : /*
1648 : * If we are in a context where we cannot update error information in
1649 : * the on-disk superblock, we queue this work to do it.
1650 : */
1651 : struct work_struct s_error_work;
1652 :
1653 : /* Ext4 fast commit stuff */
1654 : atomic_t s_fc_subtid;
1655 : atomic_t s_fc_ineligible_updates;
1656 : /*
1657 : * After commit starts, the main queue gets locked, and the further
1658 : * updates get added in the staging queue.
1659 : */
1660 : #define FC_Q_MAIN 0
1661 : #define FC_Q_STAGING 1
1662 : struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1663 : * that have data changes in them.
1664 : */
1665 : struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1666 : unsigned int s_fc_bytes;
1667 : /*
1668 : * Main fast commit lock. This lock protects accesses to the
1669 : * following fields:
1670 : * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1671 : */
1672 : spinlock_t s_fc_lock;
1673 : struct buffer_head *s_fc_bh;
1674 : struct ext4_fc_stats s_fc_stats;
1675 : u64 s_fc_avg_commit_time;
1676 : #ifdef CONFIG_EXT4_DEBUG
1677 : int s_fc_debug_max_replay;
1678 : #endif
1679 : struct ext4_fc_replay_state s_fc_replay_state;
1680 : };
1681 :
1682 1034259 : static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1683 : {
1684 604529 : return sb->s_fs_info;
1685 : }
1686 251991 : static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1687 : {
1688 110544 : return container_of(inode, struct ext4_inode_info, vfs_inode);
1689 : }
1690 :
1691 5017 : static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1692 : {
1693 5017 : return ino == EXT4_ROOT_INO ||
1694 5017 : (ino >= EXT4_FIRST_INO(sb) &&
1695 5017 : ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1696 : }
1697 :
1698 : /*
1699 : * Returns: sbi->field[index]
1700 : * Used to access an array element from the following sbi fields which require
1701 : * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1702 : * - s_group_desc
1703 : * - s_group_info
1704 : * - s_flex_group
1705 : */
1706 : #define sbi_array_rcu_deref(sbi, field, index) \
1707 : ({ \
1708 : typeof(*((sbi)->field)) _v; \
1709 : rcu_read_lock(); \
1710 : _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1711 : rcu_read_unlock(); \
1712 : _v; \
1713 : })
1714 :
1715 : /*
1716 : * run-time mount flags
1717 : */
1718 : enum {
1719 : EXT4_MF_MNTDIR_SAMPLED,
1720 : EXT4_MF_FS_ABORTED, /* Fatal error detected */
1721 : EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */
1722 : EXT4_MF_FC_COMMITTING /* File system underoing a fast
1723 : * commit.
1724 : */
1725 : };
1726 :
1727 1 : static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1728 : {
1729 1 : set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1730 : }
1731 :
1732 2 : static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1733 : {
1734 1 : clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1735 : }
1736 :
1737 11499 : static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1738 : {
1739 11499 : return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1740 : }
1741 :
1742 :
1743 : /*
1744 : * Simulate_fail codes
1745 : */
1746 : #define EXT4_SIM_BBITMAP_EIO 1
1747 : #define EXT4_SIM_BBITMAP_CRC 2
1748 : #define EXT4_SIM_IBITMAP_EIO 3
1749 : #define EXT4_SIM_IBITMAP_CRC 4
1750 : #define EXT4_SIM_INODE_EIO 5
1751 : #define EXT4_SIM_INODE_CRC 6
1752 : #define EXT4_SIM_DIRBLOCK_EIO 7
1753 : #define EXT4_SIM_DIRBLOCK_CRC 8
1754 :
1755 23384 : static inline bool ext4_simulate_fail(struct super_block *sb,
1756 : unsigned long code)
1757 : {
1758 : #ifdef CONFIG_EXT4_DEBUG
1759 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1760 :
1761 : if (unlikely(sbi->s_simulate_fail == code)) {
1762 : sbi->s_simulate_fail = 0;
1763 : return true;
1764 : }
1765 : #endif
1766 23384 : return false;
1767 : }
1768 :
1769 22 : static inline void ext4_simulate_fail_bh(struct super_block *sb,
1770 : struct buffer_head *bh,
1771 : unsigned long code)
1772 : {
1773 22 : if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1774 22 : clear_buffer_uptodate(bh);
1775 : }
1776 :
1777 : /*
1778 : * Error number codes for s_{first,last}_error_errno
1779 : *
1780 : * Linux errno numbers are architecture specific, so we need to translate
1781 : * them into something which is architecture independent. We don't define
1782 : * codes for all errno's; just the ones which are most likely to be the cause
1783 : * of an ext4_error() call.
1784 : */
1785 : #define EXT4_ERR_UNKNOWN 1
1786 : #define EXT4_ERR_EIO 2
1787 : #define EXT4_ERR_ENOMEM 3
1788 : #define EXT4_ERR_EFSBADCRC 4
1789 : #define EXT4_ERR_EFSCORRUPTED 5
1790 : #define EXT4_ERR_ENOSPC 6
1791 : #define EXT4_ERR_ENOKEY 7
1792 : #define EXT4_ERR_EROFS 8
1793 : #define EXT4_ERR_EFBIG 9
1794 : #define EXT4_ERR_EEXIST 10
1795 : #define EXT4_ERR_ERANGE 11
1796 : #define EXT4_ERR_EOVERFLOW 12
1797 : #define EXT4_ERR_EBUSY 13
1798 : #define EXT4_ERR_ENOTDIR 14
1799 : #define EXT4_ERR_ENOTEMPTY 15
1800 : #define EXT4_ERR_ESHUTDOWN 16
1801 : #define EXT4_ERR_EFAULT 17
1802 :
1803 : /*
1804 : * Inode dynamic state flags
1805 : */
1806 : enum {
1807 : EXT4_STATE_JDATA, /* journaled data exists */
1808 : EXT4_STATE_NEW, /* inode is newly created */
1809 : EXT4_STATE_XATTR, /* has in-inode xattrs */
1810 : EXT4_STATE_NO_EXPAND, /* No space for expansion */
1811 : EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1812 : EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1813 : EXT4_STATE_NEWENTRY, /* File just added to dir */
1814 : EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1815 : EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1816 : EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1817 : EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1818 : EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1819 : };
1820 :
1821 : #define EXT4_INODE_BIT_FNS(name, field, offset) \
1822 : static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1823 : { \
1824 : return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1825 : } \
1826 : static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1827 : { \
1828 : set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1829 : } \
1830 : static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1831 : { \
1832 : clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1833 : }
1834 :
1835 : /* Add these declarations here only so that these functions can be
1836 : * found by name. Otherwise, they are very hard to locate. */
1837 : static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1838 : static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1839 : static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1840 98744 : EXT4_INODE_BIT_FNS(flag, flags, 0)
1841 :
1842 : /* Add these declarations here only so that these functions can be
1843 : * found by name. Otherwise, they are very hard to locate. */
1844 : static inline int ext4_test_inode_state(struct inode *inode, int bit);
1845 : static inline void ext4_set_inode_state(struct inode *inode, int bit);
1846 : static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1847 : #if (BITS_PER_LONG < 64)
1848 : EXT4_INODE_BIT_FNS(state, state_flags, 0)
1849 :
1850 : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1851 : {
1852 : (ei)->i_state_flags = 0;
1853 : }
1854 : #else
1855 66536 : EXT4_INODE_BIT_FNS(state, flags, 32)
1856 :
1857 5563 : static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1858 : {
1859 : /* We depend on the fact that callers will set i_flags */
1860 5563 : }
1861 : #endif
1862 : #else
1863 : /* Assume that user mode programs are passing in an ext4fs superblock, not
1864 : * a kernel struct super_block. This will allow us to call the feature-test
1865 : * macros from user land. */
1866 : #define EXT4_SB(sb) (sb)
1867 : #endif
1868 :
1869 3383 : static inline bool ext4_verity_in_progress(struct inode *inode)
1870 : {
1871 3383 : return IS_ENABLED(CONFIG_FS_VERITY) &&
1872 : ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1873 : }
1874 :
1875 : #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1876 :
1877 : /*
1878 : * Codes for operating systems
1879 : */
1880 : #define EXT4_OS_LINUX 0
1881 : #define EXT4_OS_HURD 1
1882 : #define EXT4_OS_MASIX 2
1883 : #define EXT4_OS_FREEBSD 3
1884 : #define EXT4_OS_LITES 4
1885 :
1886 : /*
1887 : * Revision levels
1888 : */
1889 : #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1890 : #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1891 :
1892 : #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1893 :
1894 : #define EXT4_GOOD_OLD_INODE_SIZE 128
1895 :
1896 : #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1897 : #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1898 : #define EXT4_TIMESTAMP_MIN S32_MIN
1899 :
1900 : /*
1901 : * Feature set definitions
1902 : */
1903 :
1904 : #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1905 : #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1906 : #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1907 : #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1908 : #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1909 : #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1910 : #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1911 : /*
1912 : * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1913 : * incompatible only if fast commit blocks are present in the FS. Since we
1914 : * clear the journal (and thus the fast commit blocks), we don't mark FS as
1915 : * incompatible. We also have a JBD2 incompat feature, which gets set when
1916 : * there are fast commit blocks present in the journal.
1917 : */
1918 : #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
1919 : #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1920 :
1921 : #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1922 : #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1923 : #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1924 : #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1925 : #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1926 : #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1927 : #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1928 : #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1929 : #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1930 : /*
1931 : * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1932 : * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1933 : * all other data structures' checksums. However, the METADATA_CSUM and
1934 : * GDT_CSUM bits are mutually exclusive.
1935 : */
1936 : #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1937 : #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1938 : #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1939 : #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
1940 :
1941 : #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1942 : #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1943 : #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1944 : #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1945 : #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1946 : #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1947 : #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1948 : #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1949 : #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1950 : #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1951 : #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1952 : #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1953 : #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1954 : #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1955 : #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1956 : #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
1957 :
1958 : extern void ext4_update_dynamic_rev(struct super_block *sb);
1959 :
1960 : #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1961 : static inline bool ext4_has_feature_##name(struct super_block *sb) \
1962 : { \
1963 : return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1964 : cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1965 : } \
1966 : static inline void ext4_set_feature_##name(struct super_block *sb) \
1967 : { \
1968 : ext4_update_dynamic_rev(sb); \
1969 : EXT4_SB(sb)->s_es->s_feature_compat |= \
1970 : cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1971 : } \
1972 : static inline void ext4_clear_feature_##name(struct super_block *sb) \
1973 : { \
1974 : EXT4_SB(sb)->s_es->s_feature_compat &= \
1975 : ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1976 : }
1977 :
1978 : #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1979 : static inline bool ext4_has_feature_##name(struct super_block *sb) \
1980 : { \
1981 : return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1982 : cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1983 : } \
1984 : static inline void ext4_set_feature_##name(struct super_block *sb) \
1985 : { \
1986 : ext4_update_dynamic_rev(sb); \
1987 : EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1988 : cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1989 : } \
1990 : static inline void ext4_clear_feature_##name(struct super_block *sb) \
1991 : { \
1992 : EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1993 : ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1994 : }
1995 :
1996 : #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1997 : static inline bool ext4_has_feature_##name(struct super_block *sb) \
1998 : { \
1999 : return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2000 : cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2001 : } \
2002 : static inline void ext4_set_feature_##name(struct super_block *sb) \
2003 : { \
2004 : ext4_update_dynamic_rev(sb); \
2005 : EXT4_SB(sb)->s_es->s_feature_incompat |= \
2006 : cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2007 : } \
2008 : static inline void ext4_clear_feature_##name(struct super_block *sb) \
2009 : { \
2010 : EXT4_SB(sb)->s_es->s_feature_incompat &= \
2011 : ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2012 : }
2013 :
2014 : EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2015 : EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2016 16103 : EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2017 0 : EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2018 0 : EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2019 33614 : EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2020 50 : EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2021 2 : EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2022 : EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2023 :
2024 46 : EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2025 2203 : EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2026 : EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2027 4936 : EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2028 3616 : EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2029 0 : EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2030 2 : EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2031 1 : EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2032 18 : EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2033 73946 : EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2034 2 : EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2035 15997 : EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2036 1 : EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2037 :
2038 : EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2039 6804 : EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2040 4 : EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2041 : EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2042 39 : EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2043 1724 : EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2044 6254 : EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2045 2 : EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2046 232 : EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2047 840 : EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2048 : EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2049 2 : EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2050 18693 : EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2051 628 : EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2052 1 : EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2053 3 : EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2054 :
2055 : #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2056 : #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2057 : EXT4_FEATURE_INCOMPAT_META_BG)
2058 : #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2059 : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2060 : EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2061 :
2062 : #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2063 : #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2064 : EXT4_FEATURE_INCOMPAT_RECOVER| \
2065 : EXT4_FEATURE_INCOMPAT_META_BG)
2066 : #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2067 : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2068 : EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2069 :
2070 : #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2071 : #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2072 : EXT4_FEATURE_INCOMPAT_RECOVER| \
2073 : EXT4_FEATURE_INCOMPAT_META_BG| \
2074 : EXT4_FEATURE_INCOMPAT_EXTENTS| \
2075 : EXT4_FEATURE_INCOMPAT_64BIT| \
2076 : EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2077 : EXT4_FEATURE_INCOMPAT_EA_INODE| \
2078 : EXT4_FEATURE_INCOMPAT_MMP | \
2079 : EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2080 : EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2081 : EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2082 : EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2083 : EXT4_FEATURE_INCOMPAT_LARGEDIR)
2084 : #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2085 : EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2086 : EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2087 : EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2088 : EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2089 : EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2090 : EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2091 : EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2092 : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2093 : EXT4_FEATURE_RO_COMPAT_QUOTA |\
2094 : EXT4_FEATURE_RO_COMPAT_PROJECT |\
2095 : EXT4_FEATURE_RO_COMPAT_VERITY)
2096 :
2097 : #define EXTN_FEATURE_FUNCS(ver) \
2098 : static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2099 : { \
2100 : return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2101 : cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2102 : } \
2103 : static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2104 : { \
2105 : return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2106 : cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2107 : } \
2108 : static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2109 : { \
2110 : return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2111 : cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2112 : }
2113 :
2114 : EXTN_FEATURE_FUNCS(2)
2115 1 : EXTN_FEATURE_FUNCS(3)
2116 4 : EXTN_FEATURE_FUNCS(4)
2117 :
2118 0 : static inline bool ext4_has_compat_features(struct super_block *sb)
2119 : {
2120 0 : return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2121 : }
2122 0 : static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2123 : {
2124 0 : return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2125 : }
2126 0 : static inline bool ext4_has_incompat_features(struct super_block *sb)
2127 : {
2128 0 : return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2129 : }
2130 :
2131 : /*
2132 : * Superblock flags
2133 : */
2134 : #define EXT4_FLAGS_RESIZING 0
2135 : #define EXT4_FLAGS_SHUTDOWN 1
2136 : #define EXT4_FLAGS_BDEV_IS_DAX 2
2137 :
2138 90725 : static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2139 : {
2140 90725 : return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2141 : }
2142 :
2143 :
2144 : /*
2145 : * Default values for user and/or group using reserved blocks
2146 : */
2147 : #define EXT4_DEF_RESUID 0
2148 : #define EXT4_DEF_RESGID 0
2149 :
2150 : /*
2151 : * Default project ID
2152 : */
2153 : #define EXT4_DEF_PROJID 0
2154 :
2155 : #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2156 :
2157 : /*
2158 : * Default mount options
2159 : */
2160 : #define EXT4_DEFM_DEBUG 0x0001
2161 : #define EXT4_DEFM_BSDGROUPS 0x0002
2162 : #define EXT4_DEFM_XATTR_USER 0x0004
2163 : #define EXT4_DEFM_ACL 0x0008
2164 : #define EXT4_DEFM_UID16 0x0010
2165 : #define EXT4_DEFM_JMODE 0x0060
2166 : #define EXT4_DEFM_JMODE_DATA 0x0020
2167 : #define EXT4_DEFM_JMODE_ORDERED 0x0040
2168 : #define EXT4_DEFM_JMODE_WBACK 0x0060
2169 : #define EXT4_DEFM_NOBARRIER 0x0100
2170 : #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2171 : #define EXT4_DEFM_DISCARD 0x0400
2172 : #define EXT4_DEFM_NODELALLOC 0x0800
2173 :
2174 : /*
2175 : * Default journal batch times
2176 : */
2177 : #define EXT4_DEF_MIN_BATCH_TIME 0
2178 : #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2179 :
2180 : /*
2181 : * Minimum number of groups in a flexgroup before we separate out
2182 : * directories into the first block group of a flexgroup
2183 : */
2184 : #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2185 :
2186 : /*
2187 : * Structure of a directory entry
2188 : */
2189 : #define EXT4_NAME_LEN 255
2190 :
2191 : struct ext4_dir_entry {
2192 : __le32 inode; /* Inode number */
2193 : __le16 rec_len; /* Directory entry length */
2194 : __le16 name_len; /* Name length */
2195 : char name[EXT4_NAME_LEN]; /* File name */
2196 : };
2197 :
2198 : /*
2199 : * The new version of the directory entry. Since EXT4 structures are
2200 : * stored in intel byte order, and the name_len field could never be
2201 : * bigger than 255 chars, it's safe to reclaim the extra byte for the
2202 : * file_type field.
2203 : */
2204 : struct ext4_dir_entry_2 {
2205 : __le32 inode; /* Inode number */
2206 : __le16 rec_len; /* Directory entry length */
2207 : __u8 name_len; /* Name length */
2208 : __u8 file_type; /* See file type macros EXT4_FT_* below */
2209 : char name[EXT4_NAME_LEN]; /* File name */
2210 : };
2211 :
2212 : /*
2213 : * This is a bogus directory entry at the end of each leaf block that
2214 : * records checksums.
2215 : */
2216 : struct ext4_dir_entry_tail {
2217 : __le32 det_reserved_zero1; /* Pretend to be unused */
2218 : __le16 det_rec_len; /* 12 */
2219 : __u8 det_reserved_zero2; /* Zero name length */
2220 : __u8 det_reserved_ft; /* 0xDE, fake file type */
2221 : __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2222 : };
2223 :
2224 : #define EXT4_DIRENT_TAIL(block, blocksize) \
2225 : ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2226 : ((blocksize) - \
2227 : sizeof(struct ext4_dir_entry_tail))))
2228 :
2229 : /*
2230 : * Ext4 directory file types. Only the low 3 bits are used. The
2231 : * other bits are reserved for now.
2232 : */
2233 : #define EXT4_FT_UNKNOWN 0
2234 : #define EXT4_FT_REG_FILE 1
2235 : #define EXT4_FT_DIR 2
2236 : #define EXT4_FT_CHRDEV 3
2237 : #define EXT4_FT_BLKDEV 4
2238 : #define EXT4_FT_FIFO 5
2239 : #define EXT4_FT_SOCK 6
2240 : #define EXT4_FT_SYMLINK 7
2241 :
2242 : #define EXT4_FT_MAX 8
2243 :
2244 : #define EXT4_FT_DIR_CSUM 0xDE
2245 :
2246 : /*
2247 : * EXT4_DIR_PAD defines the directory entries boundaries
2248 : *
2249 : * NOTE: It must be a multiple of 4
2250 : */
2251 : #define EXT4_DIR_PAD 4
2252 : #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2253 : #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
2254 : ~EXT4_DIR_ROUND)
2255 : #define EXT4_MAX_REC_LEN ((1<<16)-1)
2256 :
2257 : /*
2258 : * If we ever get support for fs block sizes > page_size, we'll need
2259 : * to remove the #if statements in the next two functions...
2260 : */
2261 : static inline unsigned int
2262 290801 : ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2263 : {
2264 290801 : unsigned len = le16_to_cpu(dlen);
2265 :
2266 : #if (PAGE_SIZE >= 65536)
2267 : if (len == EXT4_MAX_REC_LEN || len == 0)
2268 : return blocksize;
2269 : return (len & 65532) | ((len & 3) << 16);
2270 : #else
2271 290628 : return len;
2272 : #endif
2273 : }
2274 :
2275 2024 : static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2276 : {
2277 2024 : if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2278 0 : BUG();
2279 : #if (PAGE_SIZE >= 65536)
2280 : if (len < 65536)
2281 : return cpu_to_le16(len);
2282 : if (len == blocksize) {
2283 : if (blocksize == 65536)
2284 : return cpu_to_le16(EXT4_MAX_REC_LEN);
2285 : else
2286 : return cpu_to_le16(0);
2287 : }
2288 : return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2289 : #else
2290 2024 : return cpu_to_le16(len);
2291 : #endif
2292 : }
2293 :
2294 : /*
2295 : * Hash Tree Directory indexing
2296 : * (c) Daniel Phillips, 2001
2297 : */
2298 :
2299 : #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2300 : ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2301 : #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2302 : !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2303 : #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2304 :
2305 : /* Legal values for the dx_root hash_version field: */
2306 :
2307 : #define DX_HASH_LEGACY 0
2308 : #define DX_HASH_HALF_MD4 1
2309 : #define DX_HASH_TEA 2
2310 : #define DX_HASH_LEGACY_UNSIGNED 3
2311 : #define DX_HASH_HALF_MD4_UNSIGNED 4
2312 : #define DX_HASH_TEA_UNSIGNED 5
2313 :
2314 0 : static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2315 : const void *address, unsigned int length)
2316 : {
2317 0 : struct {
2318 : struct shash_desc shash;
2319 : char ctx[4];
2320 : } desc;
2321 :
2322 0 : BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2323 :
2324 0 : desc.shash.tfm = sbi->s_chksum_driver;
2325 0 : *(u32 *)desc.ctx = crc;
2326 :
2327 0 : BUG_ON(crypto_shash_update(&desc.shash, address, length));
2328 :
2329 0 : return *(u32 *)desc.ctx;
2330 : }
2331 :
2332 : #ifdef __KERNEL__
2333 :
2334 : /* hash info structure used by the directory hash */
2335 : struct dx_hash_info
2336 : {
2337 : u32 hash;
2338 : u32 minor_hash;
2339 : int hash_version;
2340 : u32 *seed;
2341 : };
2342 :
2343 :
2344 : /* 32 and 64 bit signed EOF for dx directories */
2345 : #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2346 : #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2347 :
2348 :
2349 : /*
2350 : * Control parameters used by ext4_htree_next_block
2351 : */
2352 : #define HASH_NB_ALWAYS 1
2353 :
2354 : struct ext4_filename {
2355 : const struct qstr *usr_fname;
2356 : struct fscrypt_str disk_name;
2357 : struct dx_hash_info hinfo;
2358 : #ifdef CONFIG_FS_ENCRYPTION
2359 : struct fscrypt_str crypto_buf;
2360 : #endif
2361 : #ifdef CONFIG_UNICODE
2362 : struct fscrypt_str cf_name;
2363 : #endif
2364 : };
2365 :
2366 : #define fname_name(p) ((p)->disk_name.name)
2367 : #define fname_len(p) ((p)->disk_name.len)
2368 :
2369 : /*
2370 : * Describe an inode's exact location on disk and in memory
2371 : */
2372 : struct ext4_iloc
2373 : {
2374 : struct buffer_head *bh;
2375 : unsigned long offset;
2376 : ext4_group_t block_group;
2377 : };
2378 :
2379 15368 : static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2380 : {
2381 15368 : return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2382 : }
2383 :
2384 418 : static inline bool ext4_is_quota_file(struct inode *inode)
2385 : {
2386 418 : return IS_NOQUOTA(inode) &&
2387 0 : !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2388 : }
2389 :
2390 : /*
2391 : * This structure is stuffed into the struct file's private_data field
2392 : * for directories. It is where we put information so that we can do
2393 : * readdir operations in hash tree order.
2394 : */
2395 : struct dir_private_info {
2396 : struct rb_root root;
2397 : struct rb_node *curr_node;
2398 : struct fname *extra_fname;
2399 : loff_t last_pos;
2400 : __u32 curr_hash;
2401 : __u32 curr_minor_hash;
2402 : __u32 next_hash;
2403 : };
2404 :
2405 : /* calculate the first block number of the group */
2406 : static inline ext4_fsblk_t
2407 777 : ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2408 : {
2409 777 : return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2410 777 : le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2411 : }
2412 :
2413 : /*
2414 : * Special error return code only used by dx_probe() and its callers.
2415 : */
2416 : #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2417 :
2418 : /* htree levels for ext4 */
2419 : #define EXT4_HTREE_LEVEL_COMPAT 2
2420 : #define EXT4_HTREE_LEVEL 3
2421 :
2422 3325 : static inline int ext4_dir_htree_level(struct super_block *sb)
2423 : {
2424 0 : return ext4_has_feature_largedir(sb) ?
2425 3325 : EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2426 : }
2427 :
2428 : /*
2429 : * Timeout and state flag for lazy initialization inode thread.
2430 : */
2431 : #define EXT4_DEF_LI_WAIT_MULT 10
2432 : #define EXT4_DEF_LI_MAX_START_DELAY 5
2433 : #define EXT4_LAZYINIT_QUIT 0x0001
2434 : #define EXT4_LAZYINIT_RUNNING 0x0002
2435 :
2436 : /*
2437 : * Lazy inode table initialization info
2438 : */
2439 : struct ext4_lazy_init {
2440 : unsigned long li_state;
2441 : struct list_head li_request_list;
2442 : struct mutex li_list_mtx;
2443 : };
2444 :
2445 : enum ext4_li_mode {
2446 : EXT4_LI_MODE_PREFETCH_BBITMAP,
2447 : EXT4_LI_MODE_ITABLE,
2448 : };
2449 :
2450 : struct ext4_li_request {
2451 : struct super_block *lr_super;
2452 : enum ext4_li_mode lr_mode;
2453 : ext4_group_t lr_first_not_zeroed;
2454 : ext4_group_t lr_next_group;
2455 : struct list_head lr_request;
2456 : unsigned long lr_next_sched;
2457 : unsigned long lr_timeout;
2458 : };
2459 :
2460 : struct ext4_features {
2461 : struct kobject f_kobj;
2462 : struct completion f_kobj_unregister;
2463 : };
2464 :
2465 : /*
2466 : * This structure will be used for multiple mount protection. It will be
2467 : * written into the block number saved in the s_mmp_block field in the
2468 : * superblock. Programs that check MMP should assume that if
2469 : * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2470 : * to use the filesystem, regardless of how old the timestamp is.
2471 : */
2472 : #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2473 : #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2474 : #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2475 : #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2476 :
2477 : struct mmp_struct {
2478 : __le32 mmp_magic; /* Magic number for MMP */
2479 : __le32 mmp_seq; /* Sequence no. updated periodically */
2480 :
2481 : /*
2482 : * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2483 : * purposes and do not affect the correctness of the algorithm
2484 : */
2485 : __le64 mmp_time; /* Time last updated */
2486 : char mmp_nodename[64]; /* Node which last updated MMP block */
2487 : char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2488 :
2489 : /*
2490 : * mmp_check_interval is used to verify if the MMP block has been
2491 : * updated on the block device. The value is updated based on the
2492 : * maximum time to write the MMP block during an update cycle.
2493 : */
2494 : __le16 mmp_check_interval;
2495 :
2496 : __le16 mmp_pad1;
2497 : __le32 mmp_pad2[226];
2498 : __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2499 : };
2500 :
2501 : /* arguments passed to the mmp thread */
2502 : struct mmpd_data {
2503 : struct buffer_head *bh; /* bh from initial read_mmp_block() */
2504 : struct super_block *sb; /* super block of the fs */
2505 : };
2506 :
2507 : /*
2508 : * Check interval multiplier
2509 : * The MMP block is written every update interval and initially checked every
2510 : * update interval x the multiplier (the value is then adapted based on the
2511 : * write latency). The reason is that writes can be delayed under load and we
2512 : * don't want readers to incorrectly assume that the filesystem is no longer
2513 : * in use.
2514 : */
2515 : #define EXT4_MMP_CHECK_MULT 2UL
2516 :
2517 : /*
2518 : * Minimum interval for MMP checking in seconds.
2519 : */
2520 : #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2521 :
2522 : /*
2523 : * Maximum interval for MMP checking in seconds.
2524 : */
2525 : #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2526 :
2527 : /*
2528 : * Function prototypes
2529 : */
2530 :
2531 : /*
2532 : * Ok, these declarations are also in <linux/kernel.h> but none of the
2533 : * ext4 source programs needs to include it so they are duplicated here.
2534 : */
2535 : # define NORET_TYPE /**/
2536 : # define ATTRIB_NORET __attribute__((noreturn))
2537 : # define NORET_AND noreturn,
2538 :
2539 : /* bitmap.c */
2540 : extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2541 : void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2542 : struct ext4_group_desc *gdp,
2543 : struct buffer_head *bh, int sz);
2544 : int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2545 : struct ext4_group_desc *gdp,
2546 : struct buffer_head *bh, int sz);
2547 : void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2548 : struct ext4_group_desc *gdp,
2549 : struct buffer_head *bh);
2550 : int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2551 : struct ext4_group_desc *gdp,
2552 : struct buffer_head *bh);
2553 :
2554 : /* balloc.c */
2555 : extern void ext4_get_group_no_and_offset(struct super_block *sb,
2556 : ext4_fsblk_t blocknr,
2557 : ext4_group_t *blockgrpp,
2558 : ext4_grpblk_t *offsetp);
2559 : extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2560 : ext4_fsblk_t block);
2561 :
2562 : extern unsigned int ext4_block_group(struct super_block *sb,
2563 : ext4_fsblk_t blocknr);
2564 : extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2565 : ext4_fsblk_t blocknr);
2566 : extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2567 : extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2568 : ext4_group_t group);
2569 : extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2570 : ext4_fsblk_t goal,
2571 : unsigned int flags,
2572 : unsigned long *count,
2573 : int *errp);
2574 : extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2575 : s64 nclusters, unsigned int flags);
2576 : extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2577 : extern void ext4_check_blocks_bitmap(struct super_block *);
2578 : extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2579 : ext4_group_t block_group,
2580 : struct buffer_head ** bh);
2581 : extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2582 :
2583 : extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2584 : ext4_group_t block_group,
2585 : bool ignore_locked);
2586 : extern int ext4_wait_block_bitmap(struct super_block *sb,
2587 : ext4_group_t block_group,
2588 : struct buffer_head *bh);
2589 : extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2590 : ext4_group_t block_group);
2591 : extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2592 : ext4_group_t block_group,
2593 : struct ext4_group_desc *gdp);
2594 : ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2595 :
2596 : #ifdef CONFIG_UNICODE
2597 : extern void ext4_fname_setup_ci_filename(struct inode *dir,
2598 : const struct qstr *iname,
2599 : struct fscrypt_str *fname);
2600 : #endif
2601 :
2602 : #ifdef CONFIG_FS_ENCRYPTION
2603 : static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2604 : const struct fscrypt_name *src)
2605 : {
2606 : memset(dst, 0, sizeof(*dst));
2607 :
2608 : dst->usr_fname = src->usr_fname;
2609 : dst->disk_name = src->disk_name;
2610 : dst->hinfo.hash = src->hash;
2611 : dst->hinfo.minor_hash = src->minor_hash;
2612 : dst->crypto_buf = src->crypto_buf;
2613 : }
2614 :
2615 : static inline int ext4_fname_setup_filename(struct inode *dir,
2616 : const struct qstr *iname,
2617 : int lookup,
2618 : struct ext4_filename *fname)
2619 : {
2620 : struct fscrypt_name name;
2621 : int err;
2622 :
2623 : err = fscrypt_setup_filename(dir, iname, lookup, &name);
2624 : if (err)
2625 : return err;
2626 :
2627 : ext4_fname_from_fscrypt_name(fname, &name);
2628 :
2629 : #ifdef CONFIG_UNICODE
2630 : ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2631 : #endif
2632 : return 0;
2633 : }
2634 :
2635 : static inline int ext4_fname_prepare_lookup(struct inode *dir,
2636 : struct dentry *dentry,
2637 : struct ext4_filename *fname)
2638 : {
2639 : struct fscrypt_name name;
2640 : int err;
2641 :
2642 : err = fscrypt_prepare_lookup(dir, dentry, &name);
2643 : if (err)
2644 : return err;
2645 :
2646 : ext4_fname_from_fscrypt_name(fname, &name);
2647 :
2648 : #ifdef CONFIG_UNICODE
2649 : ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2650 : #endif
2651 : return 0;
2652 : }
2653 :
2654 : static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2655 : {
2656 : struct fscrypt_name name;
2657 :
2658 : name.crypto_buf = fname->crypto_buf;
2659 : fscrypt_free_filename(&name);
2660 :
2661 : fname->crypto_buf.name = NULL;
2662 : fname->usr_fname = NULL;
2663 : fname->disk_name.name = NULL;
2664 :
2665 : #ifdef CONFIG_UNICODE
2666 : kfree(fname->cf_name.name);
2667 : fname->cf_name.name = NULL;
2668 : #endif
2669 : }
2670 : #else /* !CONFIG_FS_ENCRYPTION */
2671 8109 : static inline int ext4_fname_setup_filename(struct inode *dir,
2672 : const struct qstr *iname,
2673 : int lookup,
2674 : struct ext4_filename *fname)
2675 : {
2676 8109 : fname->usr_fname = iname;
2677 8109 : fname->disk_name.name = (unsigned char *) iname->name;
2678 8109 : fname->disk_name.len = iname->len;
2679 :
2680 : #ifdef CONFIG_UNICODE
2681 : ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2682 : #endif
2683 :
2684 1073 : return 0;
2685 : }
2686 :
2687 7036 : static inline int ext4_fname_prepare_lookup(struct inode *dir,
2688 : struct dentry *dentry,
2689 : struct ext4_filename *fname)
2690 : {
2691 7036 : return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2692 : }
2693 :
2694 8109 : static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2695 : {
2696 : #ifdef CONFIG_UNICODE
2697 : kfree(fname->cf_name.name);
2698 : fname->cf_name.name = NULL;
2699 : #endif
2700 708 : }
2701 : #endif /* !CONFIG_FS_ENCRYPTION */
2702 :
2703 : /* dir.c */
2704 : extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2705 : struct file *,
2706 : struct ext4_dir_entry_2 *,
2707 : struct buffer_head *, char *, int,
2708 : unsigned int);
2709 : #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2710 : unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2711 : (de), (bh), (buf), (size), (offset)))
2712 : extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2713 : __u32 minor_hash,
2714 : struct ext4_dir_entry_2 *dirent,
2715 : struct fscrypt_str *ent_name);
2716 : extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2717 : extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2718 : struct buffer_head *bh,
2719 : void *buf, int buf_size,
2720 : struct ext4_filename *fname,
2721 : struct ext4_dir_entry_2 **dest_de);
2722 : void ext4_insert_dentry(struct inode *inode,
2723 : struct ext4_dir_entry_2 *de,
2724 : int buf_size,
2725 : struct ext4_filename *fname);
2726 1145 : static inline void ext4_update_dx_flag(struct inode *inode)
2727 : {
2728 1145 : if (!ext4_has_feature_dir_index(inode->i_sb) &&
2729 0 : ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2730 : /* ext4_iget() should have caught this... */
2731 0 : WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2732 0 : ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2733 : }
2734 1145 : }
2735 : static const unsigned char ext4_filetype_table[] = {
2736 : DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2737 : };
2738 :
2739 6774 : static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2740 : {
2741 6774 : if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2742 : return DT_UNKNOWN;
2743 :
2744 6774 : return ext4_filetype_table[filetype];
2745 : }
2746 : extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2747 : void *buf, int buf_size);
2748 :
2749 : /* fsync.c */
2750 : extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2751 :
2752 : /* hash.c */
2753 : extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2754 : struct dx_hash_info *hinfo);
2755 :
2756 : /* ialloc.c */
2757 : extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2758 : extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2759 : struct inode *, umode_t,
2760 : const struct qstr *qstr, __u32 goal,
2761 : uid_t *owner, __u32 i_flags,
2762 : int handle_type, unsigned int line_no,
2763 : int nblocks);
2764 :
2765 : #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2766 : __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \
2767 : (goal), (owner), i_flags, 0, 0, 0)
2768 : #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2769 : type, nblocks) \
2770 : __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2771 : 0, (type), __LINE__, (nblocks))
2772 :
2773 :
2774 : extern void ext4_free_inode(handle_t *, struct inode *);
2775 : extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2776 : extern unsigned long ext4_count_free_inodes(struct super_block *);
2777 : extern unsigned long ext4_count_dirs(struct super_block *);
2778 : extern void ext4_check_inodes_bitmap(struct super_block *);
2779 : extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2780 : extern int ext4_init_inode_table(struct super_block *sb,
2781 : ext4_group_t group, int barrier);
2782 : extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2783 :
2784 : /* fast_commit.c */
2785 : int ext4_fc_info_show(struct seq_file *seq, void *v);
2786 : void ext4_fc_init(struct super_block *sb, journal_t *journal);
2787 : void ext4_fc_init_inode(struct inode *inode);
2788 : void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2789 : ext4_lblk_t end);
2790 : void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2791 : struct dentry *dentry);
2792 : void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2793 : struct dentry *dentry);
2794 : void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2795 : void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2796 : void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2797 : void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2798 : void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2799 : void ext4_fc_start_ineligible(struct super_block *sb, int reason);
2800 : void ext4_fc_stop_ineligible(struct super_block *sb);
2801 : void ext4_fc_start_update(struct inode *inode);
2802 : void ext4_fc_stop_update(struct inode *inode);
2803 : void ext4_fc_del(struct inode *inode);
2804 : bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2805 : void ext4_fc_replay_cleanup(struct super_block *sb);
2806 : int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2807 : int __init ext4_fc_init_dentry_cache(void);
2808 :
2809 : /* mballoc.c */
2810 : extern const struct seq_operations ext4_mb_seq_groups_ops;
2811 : extern long ext4_mb_stats;
2812 : extern long ext4_mb_max_to_scan;
2813 : extern int ext4_mb_init(struct super_block *);
2814 : extern int ext4_mb_release(struct super_block *);
2815 : extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2816 : struct ext4_allocation_request *, int *);
2817 : extern int ext4_mb_reserve_blocks(struct super_block *, int);
2818 : extern void ext4_discard_preallocations(struct inode *, unsigned int);
2819 : extern int __init ext4_init_mballoc(void);
2820 : extern void ext4_exit_mballoc(void);
2821 : extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2822 : ext4_group_t group,
2823 : unsigned int nr, int *cnt);
2824 : extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2825 : unsigned int nr);
2826 :
2827 : extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2828 : struct buffer_head *bh, ext4_fsblk_t block,
2829 : unsigned long count, int flags);
2830 : extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2831 : ext4_group_t ngroups);
2832 : extern int ext4_mb_add_groupinfo(struct super_block *sb,
2833 : ext4_group_t i, struct ext4_group_desc *desc);
2834 : extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2835 : ext4_fsblk_t block, unsigned long count);
2836 : extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2837 : extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2838 : extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2839 : int len, int state);
2840 :
2841 : /* inode.c */
2842 : void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2843 : struct ext4_inode_info *ei);
2844 : int ext4_inode_is_fast_symlink(struct inode *inode);
2845 : struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2846 : struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2847 : int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2848 : bool wait, struct buffer_head **bhs);
2849 : int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2850 : struct buffer_head *bh_result, int create);
2851 : int ext4_get_block(struct inode *inode, sector_t iblock,
2852 : struct buffer_head *bh_result, int create);
2853 : int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2854 : struct buffer_head *bh, int create);
2855 : int ext4_walk_page_buffers(handle_t *handle,
2856 : struct buffer_head *head,
2857 : unsigned from,
2858 : unsigned to,
2859 : int *partial,
2860 : int (*fn)(handle_t *handle,
2861 : struct buffer_head *bh));
2862 : int do_journal_get_write_access(handle_t *handle,
2863 : struct buffer_head *bh);
2864 : #define FALL_BACK_TO_NONDELALLOC 1
2865 : #define CONVERT_INLINE_DATA 2
2866 :
2867 : typedef enum {
2868 : EXT4_IGET_NORMAL = 0,
2869 : EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2870 : EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2871 : } ext4_iget_flags;
2872 :
2873 : extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2874 : ext4_iget_flags flags, const char *function,
2875 : unsigned int line);
2876 :
2877 : #define ext4_iget(sb, ino, flags) \
2878 : __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2879 :
2880 : extern int ext4_write_inode(struct inode *, struct writeback_control *);
2881 : extern int ext4_setattr(struct user_namespace *, struct dentry *,
2882 : struct iattr *);
2883 : extern int ext4_getattr(struct user_namespace *, const struct path *,
2884 : struct kstat *, u32, unsigned int);
2885 : extern void ext4_evict_inode(struct inode *);
2886 : extern void ext4_clear_inode(struct inode *);
2887 : extern int ext4_file_getattr(struct user_namespace *, const struct path *,
2888 : struct kstat *, u32, unsigned int);
2889 : extern int ext4_sync_inode(handle_t *, struct inode *);
2890 : extern void ext4_dirty_inode(struct inode *, int);
2891 : extern int ext4_change_inode_journal_flag(struct inode *, int);
2892 : extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2893 : extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2894 : struct ext4_iloc *iloc);
2895 : extern int ext4_inode_attach_jinode(struct inode *inode);
2896 : extern int ext4_can_truncate(struct inode *inode);
2897 : extern int ext4_truncate(struct inode *);
2898 : extern int ext4_break_layouts(struct inode *);
2899 : extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2900 : extern void ext4_set_inode_flags(struct inode *, bool init);
2901 : extern int ext4_alloc_da_blocks(struct inode *inode);
2902 : extern void ext4_set_aops(struct inode *inode);
2903 : extern int ext4_writepage_trans_blocks(struct inode *);
2904 : extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2905 : extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2906 : loff_t lstart, loff_t lend);
2907 : extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2908 : extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2909 : extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2910 : extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2911 : extern void ext4_da_release_space(struct inode *inode, int to_free);
2912 : extern void ext4_da_update_reserve_space(struct inode *inode,
2913 : int used, int quota_claim);
2914 : extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2915 : ext4_fsblk_t pblk, ext4_lblk_t len);
2916 :
2917 : /* indirect.c */
2918 : extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2919 : struct ext4_map_blocks *map, int flags);
2920 : extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2921 : extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2922 : extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2923 : ext4_lblk_t start, ext4_lblk_t end);
2924 :
2925 : /* ioctl.c */
2926 : extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2927 : extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2928 : extern void ext4_reset_inode_seed(struct inode *inode);
2929 :
2930 : /* migrate.c */
2931 : extern int ext4_ext_migrate(struct inode *);
2932 : extern int ext4_ind_migrate(struct inode *inode);
2933 :
2934 : /* namei.c */
2935 : extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
2936 : struct inode *inode);
2937 : extern int ext4_dirblock_csum_verify(struct inode *inode,
2938 : struct buffer_head *bh);
2939 : extern int ext4_orphan_add(handle_t *, struct inode *);
2940 : extern int ext4_orphan_del(handle_t *, struct inode *);
2941 : extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2942 : __u32 start_minor_hash, __u32 *next_hash);
2943 : extern int ext4_search_dir(struct buffer_head *bh,
2944 : char *search_buf,
2945 : int buf_size,
2946 : struct inode *dir,
2947 : struct ext4_filename *fname,
2948 : unsigned int offset,
2949 : struct ext4_dir_entry_2 **res_dir);
2950 : extern int ext4_generic_delete_entry(struct inode *dir,
2951 : struct ext4_dir_entry_2 *de_del,
2952 : struct buffer_head *bh,
2953 : void *entry_buf,
2954 : int buf_size,
2955 : int csum_size);
2956 : extern bool ext4_empty_dir(struct inode *inode);
2957 :
2958 : /* resize.c */
2959 : extern void ext4_kvfree_array_rcu(void *to_free);
2960 : extern int ext4_group_add(struct super_block *sb,
2961 : struct ext4_new_group_data *input);
2962 : extern int ext4_group_extend(struct super_block *sb,
2963 : struct ext4_super_block *es,
2964 : ext4_fsblk_t n_blocks_count);
2965 : extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2966 :
2967 : /* super.c */
2968 : extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2969 : sector_t block, int op_flags);
2970 : extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
2971 : sector_t block);
2972 : extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
2973 : bh_end_io_t *end_io);
2974 : extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
2975 : bh_end_io_t *end_io);
2976 : extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
2977 : extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
2978 : extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2979 : extern int ext4_calculate_overhead(struct super_block *sb);
2980 : extern void ext4_superblock_csum_set(struct super_block *sb);
2981 : extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2982 : ext4_group_t ngroup);
2983 : extern const char *ext4_decode_error(struct super_block *sb, int errno,
2984 : char nbuf[16]);
2985 : extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2986 : ext4_group_t block_group,
2987 : unsigned int flags);
2988 :
2989 : extern __printf(7, 8)
2990 : void __ext4_error(struct super_block *, const char *, unsigned int, bool,
2991 : int, __u64, const char *, ...);
2992 : extern __printf(6, 7)
2993 : void __ext4_error_inode(struct inode *, const char *, unsigned int,
2994 : ext4_fsblk_t, int, const char *, ...);
2995 : extern __printf(5, 6)
2996 : void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2997 : const char *, ...);
2998 : extern void __ext4_std_error(struct super_block *, const char *,
2999 : unsigned int, int);
3000 : extern __printf(4, 5)
3001 : void __ext4_warning(struct super_block *, const char *, unsigned int,
3002 : const char *, ...);
3003 : extern __printf(4, 5)
3004 : void __ext4_warning_inode(const struct inode *inode, const char *function,
3005 : unsigned int line, const char *fmt, ...);
3006 : extern __printf(3, 4)
3007 : void __ext4_msg(struct super_block *, const char *, const char *, ...);
3008 : extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3009 : const char *, unsigned int, const char *);
3010 : extern __printf(7, 8)
3011 : void __ext4_grp_locked_error(const char *, unsigned int,
3012 : struct super_block *, ext4_group_t,
3013 : unsigned long, ext4_fsblk_t,
3014 : const char *, ...);
3015 :
3016 : #define EXT4_ERROR_INODE(inode, fmt, a...) \
3017 : ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3018 :
3019 : #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3020 : __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3021 :
3022 : #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3023 : __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3024 : (fmt), ## a)
3025 :
3026 : #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3027 : ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3028 :
3029 : #define ext4_abort(sb, err, fmt, a...) \
3030 : __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3031 :
3032 : #ifdef CONFIG_PRINTK
3033 :
3034 : #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3035 : __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3036 : #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3037 : __ext4_error_inode((inode), (func), (line), (block), \
3038 : (err), (fmt), ##__VA_ARGS__)
3039 : #define ext4_error_file(file, func, line, block, fmt, ...) \
3040 : __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3041 : #define ext4_error(sb, fmt, ...) \
3042 : __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3043 : ##__VA_ARGS__)
3044 : #define ext4_error_err(sb, err, fmt, ...) \
3045 : __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3046 : ##__VA_ARGS__)
3047 : #define ext4_warning(sb, fmt, ...) \
3048 : __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3049 : #define ext4_warning_inode(inode, fmt, ...) \
3050 : __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3051 : #define ext4_msg(sb, level, fmt, ...) \
3052 : __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3053 : #define dump_mmp_msg(sb, mmp, msg) \
3054 : __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3055 : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3056 : __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3057 : fmt, ##__VA_ARGS__)
3058 :
3059 : #else
3060 :
3061 : #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3062 : do { \
3063 : no_printk(fmt, ##__VA_ARGS__); \
3064 : __ext4_error_inode(inode, "", 0, block, 0, " "); \
3065 : } while (0)
3066 : #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3067 : do { \
3068 : no_printk(fmt, ##__VA_ARGS__); \
3069 : __ext4_error_inode(inode, "", 0, block, err, " "); \
3070 : } while (0)
3071 : #define ext4_error_file(file, func, line, block, fmt, ...) \
3072 : do { \
3073 : no_printk(fmt, ##__VA_ARGS__); \
3074 : __ext4_error_file(file, "", 0, block, " "); \
3075 : } while (0)
3076 : #define ext4_error(sb, fmt, ...) \
3077 : do { \
3078 : no_printk(fmt, ##__VA_ARGS__); \
3079 : __ext4_error(sb, "", 0, false, 0, 0, " "); \
3080 : } while (0)
3081 : #define ext4_error_err(sb, err, fmt, ...) \
3082 : do { \
3083 : no_printk(fmt, ##__VA_ARGS__); \
3084 : __ext4_error(sb, "", 0, false, err, 0, " "); \
3085 : } while (0)
3086 : #define ext4_warning(sb, fmt, ...) \
3087 : do { \
3088 : no_printk(fmt, ##__VA_ARGS__); \
3089 : __ext4_warning(sb, "", 0, " "); \
3090 : } while (0)
3091 : #define ext4_warning_inode(inode, fmt, ...) \
3092 : do { \
3093 : no_printk(fmt, ##__VA_ARGS__); \
3094 : __ext4_warning_inode(inode, "", 0, " "); \
3095 : } while (0)
3096 : #define ext4_msg(sb, level, fmt, ...) \
3097 : do { \
3098 : no_printk(fmt, ##__VA_ARGS__); \
3099 : __ext4_msg(sb, "", " "); \
3100 : } while (0)
3101 : #define dump_mmp_msg(sb, mmp, msg) \
3102 : __dump_mmp_msg(sb, mmp, "", 0, "")
3103 : #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3104 : do { \
3105 : no_printk(fmt, ##__VA_ARGS__); \
3106 : __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3107 : } while (0)
3108 :
3109 : #endif
3110 :
3111 : extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3112 : struct ext4_group_desc *bg);
3113 : extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3114 : struct ext4_group_desc *bg);
3115 : extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3116 : struct ext4_group_desc *bg);
3117 : extern __u32 ext4_free_group_clusters(struct super_block *sb,
3118 : struct ext4_group_desc *bg);
3119 : extern __u32 ext4_free_inodes_count(struct super_block *sb,
3120 : struct ext4_group_desc *bg);
3121 : extern __u32 ext4_used_dirs_count(struct super_block *sb,
3122 : struct ext4_group_desc *bg);
3123 : extern __u32 ext4_itable_unused_count(struct super_block *sb,
3124 : struct ext4_group_desc *bg);
3125 : extern void ext4_block_bitmap_set(struct super_block *sb,
3126 : struct ext4_group_desc *bg, ext4_fsblk_t blk);
3127 : extern void ext4_inode_bitmap_set(struct super_block *sb,
3128 : struct ext4_group_desc *bg, ext4_fsblk_t blk);
3129 : extern void ext4_inode_table_set(struct super_block *sb,
3130 : struct ext4_group_desc *bg, ext4_fsblk_t blk);
3131 : extern void ext4_free_group_clusters_set(struct super_block *sb,
3132 : struct ext4_group_desc *bg,
3133 : __u32 count);
3134 : extern void ext4_free_inodes_set(struct super_block *sb,
3135 : struct ext4_group_desc *bg, __u32 count);
3136 : extern void ext4_used_dirs_set(struct super_block *sb,
3137 : struct ext4_group_desc *bg, __u32 count);
3138 : extern void ext4_itable_unused_set(struct super_block *sb,
3139 : struct ext4_group_desc *bg, __u32 count);
3140 : extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3141 : struct ext4_group_desc *gdp);
3142 : extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3143 : struct ext4_group_desc *gdp);
3144 : extern int ext4_register_li_request(struct super_block *sb,
3145 : ext4_group_t first_not_zeroed);
3146 :
3147 38694 : static inline int ext4_has_metadata_csum(struct super_block *sb)
3148 : {
3149 38694 : WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3150 : !EXT4_SB(sb)->s_chksum_driver);
3151 :
3152 38694 : return ext4_has_feature_metadata_csum(sb) &&
3153 0 : (EXT4_SB(sb)->s_chksum_driver != NULL);
3154 : }
3155 :
3156 3617 : static inline int ext4_has_group_desc_csum(struct super_block *sb)
3157 : {
3158 3617 : return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3159 : }
3160 :
3161 : #define ext4_read_incompat_64bit_val(es, name) \
3162 : (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3163 : ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3164 : le32_to_cpu(es->name##_lo))
3165 :
3166 23151 : static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3167 : {
3168 23150 : return ext4_read_incompat_64bit_val(es, s_blocks_count);
3169 : }
3170 :
3171 2080 : static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3172 : {
3173 2080 : return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3174 : }
3175 :
3176 0 : static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3177 : {
3178 0 : return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3179 : }
3180 :
3181 0 : static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3182 : ext4_fsblk_t blk)
3183 : {
3184 0 : es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3185 0 : es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3186 : }
3187 :
3188 2 : static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3189 : ext4_fsblk_t blk)
3190 : {
3191 2 : es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3192 1 : es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3193 1 : }
3194 :
3195 0 : static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3196 : ext4_fsblk_t blk)
3197 : {
3198 0 : es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3199 0 : es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3200 : }
3201 :
3202 15368 : static inline loff_t ext4_isize(struct super_block *sb,
3203 : struct ext4_inode *raw_inode)
3204 : {
3205 15368 : if (ext4_has_feature_largedir(sb) ||
3206 15368 : S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3207 10330 : return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3208 10330 : le32_to_cpu(raw_inode->i_size_lo);
3209 :
3210 5038 : return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3211 : }
3212 :
3213 413 : static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3214 : {
3215 413 : raw_inode->i_size_lo = cpu_to_le32(i_size);
3216 413 : raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3217 : }
3218 :
3219 : static inline
3220 8183 : struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3221 : ext4_group_t group)
3222 : {
3223 8183 : struct ext4_group_info **grp_info;
3224 8183 : long indexv, indexh;
3225 8183 : BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3226 8183 : indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3227 8183 : indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3228 16366 : grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3229 8183 : return grp_info[indexh];
3230 : }
3231 :
3232 : /*
3233 : * Reading s_groups_count requires using smp_rmb() afterwards. See
3234 : * the locking protocol documented in the comments of ext4_group_add()
3235 : * in resize.c
3236 : */
3237 25159 : static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3238 : {
3239 25159 : ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3240 :
3241 25155 : smp_rmb();
3242 25159 : return ngroups;
3243 : }
3244 :
3245 1462 : static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3246 : ext4_group_t block_group)
3247 : {
3248 1462 : return block_group >> sbi->s_log_groups_per_flex;
3249 : }
3250 :
3251 1437 : static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3252 : {
3253 1437 : return 1 << sbi->s_log_groups_per_flex;
3254 : }
3255 :
3256 : #define ext4_std_error(sb, errno) \
3257 : do { \
3258 : if ((errno)) \
3259 : __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3260 : } while (0)
3261 :
3262 : #ifdef CONFIG_SMP
3263 : /* Each CPU can accumulate percpu_counter_batch clusters in their local
3264 : * counters. So we need to make sure we have free clusters more
3265 : * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3266 : */
3267 : #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3268 : #else
3269 : #define EXT4_FREECLUSTERS_WATERMARK 0
3270 : #endif
3271 :
3272 : /* Update i_disksize. Requires i_mutex to avoid races with truncate */
3273 33 : static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3274 : {
3275 99 : WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3276 : !inode_is_locked(inode));
3277 33 : down_write(&EXT4_I(inode)->i_data_sem);
3278 33 : if (newsize > EXT4_I(inode)->i_disksize)
3279 33 : WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3280 33 : up_write(&EXT4_I(inode)->i_data_sem);
3281 33 : }
3282 :
3283 : /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3284 0 : static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3285 : {
3286 0 : int changed = 0;
3287 :
3288 0 : if (newsize > inode->i_size) {
3289 0 : i_size_write(inode, newsize);
3290 0 : changed = 1;
3291 : }
3292 0 : if (newsize > EXT4_I(inode)->i_disksize) {
3293 0 : ext4_update_i_disksize(inode, newsize);
3294 0 : changed |= 2;
3295 : }
3296 0 : return changed;
3297 : }
3298 :
3299 : int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3300 : loff_t len);
3301 :
3302 : struct ext4_group_info {
3303 : unsigned long bb_state;
3304 : #ifdef AGGRESSIVE_CHECK
3305 : unsigned long bb_check_counter;
3306 : #endif
3307 : struct rb_root bb_free_root;
3308 : ext4_grpblk_t bb_first_free; /* first free block */
3309 : ext4_grpblk_t bb_free; /* total free blocks */
3310 : ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3311 : ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3312 : struct list_head bb_prealloc_list;
3313 : #ifdef DOUBLE_CHECK
3314 : void *bb_bitmap;
3315 : #endif
3316 : struct rw_semaphore alloc_sem;
3317 : ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3318 : * regions, index is order.
3319 : * bb_counters[3] = 5 means
3320 : * 5 free 8-block regions. */
3321 : };
3322 :
3323 : #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3324 : #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3325 : #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3326 : #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3327 : #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3328 : (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3329 : #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3330 : (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3331 : #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3332 :
3333 : #define EXT4_MB_GRP_NEED_INIT(grp) \
3334 : (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3335 : #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3336 : (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3337 : #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3338 : (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3339 :
3340 : #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3341 : (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3342 : #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3343 : (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3344 : #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3345 : (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3346 : #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3347 : (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3348 :
3349 : #define EXT4_MAX_CONTENTION 8
3350 : #define EXT4_CONTENTION_THRESHOLD 2
3351 :
3352 8176 : static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3353 : ext4_group_t group)
3354 : {
3355 6452 : return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3356 : }
3357 :
3358 : /*
3359 : * Returns true if the filesystem is busy enough that attempts to
3360 : * access the block group locks has run into contention.
3361 : */
3362 70 : static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3363 : {
3364 70 : return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3365 : }
3366 :
3367 2371 : static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3368 : {
3369 2371 : spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3370 2371 : if (spin_trylock(lock))
3371 : /*
3372 : * We're able to grab the lock right away, so drop the
3373 : * lock contention counter.
3374 : */
3375 2371 : atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3376 : else {
3377 : /*
3378 : * The lock is busy, so bump the contention counter,
3379 : * and then wait on the spin lock.
3380 : */
3381 0 : atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3382 : EXT4_MAX_CONTENTION);
3383 0 : spin_lock(lock);
3384 : }
3385 2371 : }
3386 :
3387 2371 : static inline void ext4_unlock_group(struct super_block *sb,
3388 : ext4_group_t group)
3389 : {
3390 2371 : spin_unlock(ext4_group_lock_ptr(sb, group));
3391 0 : }
3392 :
3393 : #ifdef CONFIG_QUOTA
3394 : static inline bool ext4_quota_capable(struct super_block *sb)
3395 : {
3396 : return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3397 : }
3398 :
3399 : static inline bool ext4_is_quota_journalled(struct super_block *sb)
3400 : {
3401 : struct ext4_sb_info *sbi = EXT4_SB(sb);
3402 :
3403 : return (ext4_has_feature_quota(sb) ||
3404 : sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3405 : }
3406 : #endif
3407 :
3408 : /*
3409 : * Block validity checking
3410 : */
3411 : #define ext4_check_indirect_blockref(inode, bh) \
3412 : ext4_check_blockref(__func__, __LINE__, inode, \
3413 : (__le32 *)(bh)->b_data, \
3414 : EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3415 :
3416 : #define ext4_ind_check_inode(inode) \
3417 : ext4_check_blockref(__func__, __LINE__, inode, \
3418 : EXT4_I(inode)->i_data, \
3419 : EXT4_NDIR_BLOCKS)
3420 :
3421 : /*
3422 : * Inodes and files operations
3423 : */
3424 :
3425 : /* dir.c */
3426 : extern const struct file_operations ext4_dir_operations;
3427 :
3428 : /* file.c */
3429 : extern const struct inode_operations ext4_file_inode_operations;
3430 : extern const struct file_operations ext4_file_operations;
3431 : extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3432 :
3433 : /* inline.c */
3434 : extern int ext4_get_max_inline_size(struct inode *inode);
3435 : extern int ext4_find_inline_data_nolock(struct inode *inode);
3436 : extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3437 : unsigned int len);
3438 : extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3439 :
3440 : extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3441 : extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3442 : struct inode *inode,
3443 : loff_t pos, unsigned len,
3444 : unsigned flags,
3445 : struct page **pagep);
3446 : extern int ext4_write_inline_data_end(struct inode *inode,
3447 : loff_t pos, unsigned len,
3448 : unsigned copied,
3449 : struct page *page);
3450 : extern struct buffer_head *
3451 : ext4_journalled_write_inline_data(struct inode *inode,
3452 : unsigned len,
3453 : struct page *page);
3454 : extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3455 : struct inode *inode,
3456 : loff_t pos, unsigned len,
3457 : unsigned flags,
3458 : struct page **pagep,
3459 : void **fsdata);
3460 : extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3461 : unsigned len, unsigned copied,
3462 : struct page *page);
3463 : extern int ext4_try_add_inline_entry(handle_t *handle,
3464 : struct ext4_filename *fname,
3465 : struct inode *dir, struct inode *inode);
3466 : extern int ext4_try_create_inline_dir(handle_t *handle,
3467 : struct inode *parent,
3468 : struct inode *inode);
3469 : extern int ext4_read_inline_dir(struct file *filp,
3470 : struct dir_context *ctx,
3471 : int *has_inline_data);
3472 : extern int ext4_inlinedir_to_tree(struct file *dir_file,
3473 : struct inode *dir, ext4_lblk_t block,
3474 : struct dx_hash_info *hinfo,
3475 : __u32 start_hash, __u32 start_minor_hash,
3476 : int *has_inline_data);
3477 : extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3478 : struct ext4_filename *fname,
3479 : struct ext4_dir_entry_2 **res_dir,
3480 : int *has_inline_data);
3481 : extern int ext4_delete_inline_entry(handle_t *handle,
3482 : struct inode *dir,
3483 : struct ext4_dir_entry_2 *de_del,
3484 : struct buffer_head *bh,
3485 : int *has_inline_data);
3486 : extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3487 : extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3488 : struct ext4_dir_entry_2 **parent_de,
3489 : int *retval);
3490 : extern int ext4_inline_data_fiemap(struct inode *inode,
3491 : struct fiemap_extent_info *fieinfo,
3492 : int *has_inline, __u64 start, __u64 len);
3493 :
3494 : struct iomap;
3495 : extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3496 :
3497 : extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3498 :
3499 : extern int ext4_convert_inline_data(struct inode *inode);
3500 :
3501 53906 : static inline int ext4_has_inline_data(struct inode *inode)
3502 : {
3503 53906 : return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3504 0 : EXT4_I(inode)->i_inline_off;
3505 : }
3506 :
3507 : /* namei.c */
3508 : extern const struct inode_operations ext4_dir_inode_operations;
3509 : extern const struct inode_operations ext4_special_inode_operations;
3510 : extern struct dentry *ext4_get_parent(struct dentry *child);
3511 : extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3512 : struct ext4_dir_entry_2 *de,
3513 : int blocksize, int csum_size,
3514 : unsigned int parent_ino, int dotdot_real_len);
3515 : extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3516 : unsigned int blocksize);
3517 : extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3518 : struct buffer_head *bh);
3519 : extern int ext4_ci_compare(const struct inode *parent,
3520 : const struct qstr *fname,
3521 : const struct qstr *entry, bool quick);
3522 : extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3523 : struct inode *inode);
3524 : extern int __ext4_link(struct inode *dir, struct inode *inode,
3525 : struct dentry *dentry);
3526 :
3527 : #define S_SHIFT 12
3528 : static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3529 : [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3530 : [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3531 : [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3532 : [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3533 : [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3534 : [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3535 : [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3536 : };
3537 :
3538 1054 : static inline void ext4_set_de_type(struct super_block *sb,
3539 : struct ext4_dir_entry_2 *de,
3540 : umode_t mode) {
3541 1054 : if (ext4_has_feature_filetype(sb))
3542 1054 : de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3543 : }
3544 :
3545 : /* readpages.c */
3546 : extern int ext4_mpage_readpages(struct inode *inode,
3547 : struct readahead_control *rac, struct page *page);
3548 : extern int __init ext4_init_post_read_processing(void);
3549 : extern void ext4_exit_post_read_processing(void);
3550 :
3551 : /* symlink.c */
3552 : extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3553 : extern const struct inode_operations ext4_symlink_inode_operations;
3554 : extern const struct inode_operations ext4_fast_symlink_inode_operations;
3555 :
3556 : /* sysfs.c */
3557 : extern int ext4_register_sysfs(struct super_block *sb);
3558 : extern void ext4_unregister_sysfs(struct super_block *sb);
3559 : extern int __init ext4_init_sysfs(void);
3560 : extern void ext4_exit_sysfs(void);
3561 :
3562 : /* block_validity */
3563 : extern void ext4_release_system_zone(struct super_block *sb);
3564 : extern int ext4_setup_system_zone(struct super_block *sb);
3565 : extern int __init ext4_init_system_zone(void);
3566 : extern void ext4_exit_system_zone(void);
3567 : extern int ext4_inode_block_valid(struct inode *inode,
3568 : ext4_fsblk_t start_blk,
3569 : unsigned int count);
3570 : extern int ext4_check_blockref(const char *, unsigned int,
3571 : struct inode *, __le32 *, unsigned int);
3572 :
3573 : /* extents.c */
3574 : struct ext4_ext_path;
3575 : struct ext4_extent;
3576 :
3577 : /*
3578 : * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3579 : * __le32.
3580 : */
3581 : #define EXT_MAX_BLOCKS 0xffffffff
3582 :
3583 : extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3584 : extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3585 : extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3586 : struct ext4_map_blocks *map, int flags);
3587 : extern int ext4_ext_truncate(handle_t *, struct inode *);
3588 : extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3589 : ext4_lblk_t end);
3590 : extern void ext4_ext_init(struct super_block *);
3591 : extern void ext4_ext_release(struct super_block *);
3592 : extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3593 : loff_t len);
3594 : extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3595 : loff_t offset, ssize_t len);
3596 : extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3597 : ext4_io_end_t *io_end);
3598 : extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3599 : struct ext4_map_blocks *map, int flags);
3600 : extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3601 : int num,
3602 : struct ext4_ext_path *path);
3603 : extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3604 : struct ext4_ext_path **,
3605 : struct ext4_extent *, int);
3606 : extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3607 : struct ext4_ext_path **,
3608 : int flags);
3609 : extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3610 : extern int ext4_ext_check_inode(struct inode *inode);
3611 : extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3612 : extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3613 : __u64 start, __u64 len);
3614 : extern int ext4_get_es_cache(struct inode *inode,
3615 : struct fiemap_extent_info *fieinfo,
3616 : __u64 start, __u64 len);
3617 : extern int ext4_ext_precache(struct inode *inode);
3618 : extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3619 : struct inode *inode2, ext4_lblk_t lblk1,
3620 : ext4_lblk_t lblk2, ext4_lblk_t count,
3621 : int mark_unwritten,int *err);
3622 : extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3623 : extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3624 : int check_cred, int restart_cred,
3625 : int revoke_cred);
3626 : extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3627 : extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3628 : extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3629 : int len, int unwritten, ext4_fsblk_t pblk);
3630 : extern int ext4_ext_clear_bb(struct inode *inode);
3631 :
3632 :
3633 : /* move_extent.c */
3634 : extern void ext4_double_down_write_data_sem(struct inode *first,
3635 : struct inode *second);
3636 : extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3637 : struct inode *donor_inode);
3638 : extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3639 : __u64 start_orig, __u64 start_donor,
3640 : __u64 len, __u64 *moved_len);
3641 :
3642 : /* page-io.c */
3643 : extern int __init ext4_init_pageio(void);
3644 : extern void ext4_exit_pageio(void);
3645 : extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3646 : extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3647 : extern int ext4_put_io_end(ext4_io_end_t *io_end);
3648 : extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3649 : extern void ext4_io_submit_init(struct ext4_io_submit *io,
3650 : struct writeback_control *wbc);
3651 : extern void ext4_end_io_rsv_work(struct work_struct *work);
3652 : extern void ext4_io_submit(struct ext4_io_submit *io);
3653 : extern int ext4_bio_write_page(struct ext4_io_submit *io,
3654 : struct page *page,
3655 : int len,
3656 : bool keep_towrite);
3657 : extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3658 : extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3659 :
3660 : /* mmp.c */
3661 : extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3662 :
3663 : /* verity.c */
3664 : extern const struct fsverity_operations ext4_verityops;
3665 :
3666 : /*
3667 : * Add new method to test whether block and inode bitmaps are properly
3668 : * initialized. With uninit_bg reading the block from disk is not enough
3669 : * to mark the bitmap uptodate. We need to also zero-out the bitmap
3670 : */
3671 : #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3672 :
3673 1343 : static inline int bitmap_uptodate(struct buffer_head *bh)
3674 : {
3675 1343 : return (buffer_uptodate(bh) &&
3676 1299 : test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3677 : }
3678 22 : static inline void set_bitmap_uptodate(struct buffer_head *bh)
3679 : {
3680 22 : set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3681 22 : }
3682 :
3683 : #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3684 :
3685 : /* For ioend & aio unwritten conversion wait queues */
3686 : #define EXT4_WQ_HASH_SZ 37
3687 : #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3688 : EXT4_WQ_HASH_SZ])
3689 : extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3690 :
3691 : extern int ext4_resize_begin(struct super_block *sb);
3692 : extern void ext4_resize_end(struct super_block *sb);
3693 :
3694 70 : static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3695 : struct ext4_io_end *io_end)
3696 : {
3697 70 : if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3698 70 : io_end->flag |= EXT4_IO_END_UNWRITTEN;
3699 70 : atomic_inc(&EXT4_I(inode)->i_unwritten);
3700 : }
3701 70 : }
3702 :
3703 70 : static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3704 : {
3705 70 : struct inode *inode = io_end->inode;
3706 :
3707 70 : if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3708 70 : io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3709 : /* Wake up anyone waiting on unwritten extent conversion */
3710 140 : if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3711 63 : wake_up_all(ext4_ioend_wq(inode));
3712 : }
3713 70 : }
3714 :
3715 : extern const struct iomap_ops ext4_iomap_ops;
3716 : extern const struct iomap_ops ext4_iomap_overwrite_ops;
3717 : extern const struct iomap_ops ext4_iomap_report_ops;
3718 :
3719 16429 : static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3720 : {
3721 : /*
3722 : * If the buffer has the write error flag, we have failed
3723 : * to write out data in the block. In this case, we don't
3724 : * have to read the block because we may read the old data
3725 : * successfully.
3726 : */
3727 21011 : if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3728 0 : set_buffer_uptodate(bh);
3729 16429 : return buffer_uptodate(bh);
3730 : }
3731 :
3732 : #endif /* __KERNEL__ */
3733 :
3734 : #define EFSBADCRC EBADMSG /* Bad CRC detected */
3735 : #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3736 :
3737 : #endif /* _EXT4_H */
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