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Linux 4.19.133
[linux/fpc-iii.git] / fs / ext4 / ext4.h
blob0a4461ac4225f5a2109c06d4fc721447b1205ba3
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/version.h>
31 #include <linux/wait.h>
32 #include <linux/sched/signal.h>
33 #include <linux/blockgroup_lock.h>
34 #include <linux/percpu_counter.h>
35 #include <linux/ratelimit.h>
36 #include <crypto/hash.h>
37 #include <linux/falloc.h>
38 #include <linux/percpu-rwsem.h>
39 #ifdef __KERNEL__
40 #include <linux/compat.h>
41 #endif
42
43 #define __FS_HAS_ENCRYPTION IS_ENABLED(CONFIG_EXT4_FS_ENCRYPTION)
44 #include <linux/fscrypt.h>
45
46 #include <linux/compiler.h>
47
48 /* Until this gets included into linux/compiler-gcc.h */
49 #ifndef __nonstring
50 #if defined(GCC_VERSION) && (GCC_VERSION >= 80000)
51 #define __nonstring __attribute__((nonstring))
52 #else
53 #define __nonstring
54 #endif
55 #endif
56
57 /*
58 * The fourth extended filesystem constants/structures
59 */
60
61 /*
62 * with AGGRESSIVE_CHECK allocator runs consistency checks over
63 * structures. these checks slow things down a lot
64 */
65 #define AGGRESSIVE_CHECK__
66
67 /*
68 * with DOUBLE_CHECK defined mballoc creates persistent in-core
69 * bitmaps, maintains and uses them to check for double allocations
70 */
71 #define DOUBLE_CHECK__
72
73 /*
74 * Define EXT4FS_DEBUG to produce debug messages
75 */
76 #undef EXT4FS_DEBUG
77
78 /*
79 * Debug code
80 */
81 #ifdef EXT4FS_DEBUG
82 #define ext4_debug(f, a...) \
83 do { \
84 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
85 __FILE__, __LINE__, __func__); \
86 printk(KERN_DEBUG f, ## a); \
87 } while (0)
88 #else
89 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
90 #endif
91
92 /*
93 * Turn on EXT_DEBUG to get lots of info about extents operations.
94 */
95 #define EXT_DEBUG__
96 #ifdef EXT_DEBUG
97 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
98 #else
99 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
100 #endif
101
102 /* data type for block offset of block group */
103 typedef int ext4_grpblk_t;
104
105 /* data type for filesystem-wide blocks number */
106 typedef unsigned long long ext4_fsblk_t;
107
108 /* data type for file logical block number */
109 typedef __u32 ext4_lblk_t;
110
111 /* data type for block group number */
112 typedef unsigned int ext4_group_t;
113
114 enum SHIFT_DIRECTION {
115 SHIFT_LEFT = 0,
116 SHIFT_RIGHT,
117 };
118
119 /*
120 * Flags used in mballoc's allocation_context flags field.
121 *
122 * Also used to show what's going on for debugging purposes when the
123 * flag field is exported via the traceport interface
124 */
125
126 /* prefer goal again. length */
127 #define EXT4_MB_HINT_MERGE 0x0001
128 /* blocks already reserved */
129 #define EXT4_MB_HINT_RESERVED 0x0002
130 /* metadata is being allocated */
131 #define EXT4_MB_HINT_METADATA 0x0004
132 /* first blocks in the file */
133 #define EXT4_MB_HINT_FIRST 0x0008
134 /* search for the best chunk */
135 #define EXT4_MB_HINT_BEST 0x0010
136 /* data is being allocated */
137 #define EXT4_MB_HINT_DATA 0x0020
138 /* don't preallocate (for tails) */
139 #define EXT4_MB_HINT_NOPREALLOC 0x0040
140 /* allocate for locality group */
141 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
142 /* allocate goal blocks or none */
143 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
144 /* goal is meaningful */
145 #define EXT4_MB_HINT_TRY_GOAL 0x0200
146 /* blocks already pre-reserved by delayed allocation */
147 #define EXT4_MB_DELALLOC_RESERVED 0x0400
148 /* We are doing stream allocation */
149 #define EXT4_MB_STREAM_ALLOC 0x0800
150 /* Use reserved root blocks if needed */
151 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
152 /* Use blocks from reserved pool */
153 #define EXT4_MB_USE_RESERVED 0x2000
154
155 struct ext4_allocation_request {
156 /* target inode for block we're allocating */
157 struct inode *inode;
158 /* how many blocks we want to allocate */
159 unsigned int len;
160 /* logical block in target inode */
161 ext4_lblk_t logical;
162 /* the closest logical allocated block to the left */
163 ext4_lblk_t lleft;
164 /* the closest logical allocated block to the right */
165 ext4_lblk_t lright;
166 /* phys. target (a hint) */
167 ext4_fsblk_t goal;
168 /* phys. block for the closest logical allocated block to the left */
169 ext4_fsblk_t pleft;
170 /* phys. block for the closest logical allocated block to the right */
171 ext4_fsblk_t pright;
172 /* flags. see above EXT4_MB_HINT_* */
173 unsigned int flags;
174 };
175
176 /*
177 * Logical to physical block mapping, used by ext4_map_blocks()
178 *
179 * This structure is used to pass requests into ext4_map_blocks() as
180 * well as to store the information returned by ext4_map_blocks(). It
181 * takes less room on the stack than a struct buffer_head.
182 */
183 #define EXT4_MAP_NEW (1 << BH_New)
184 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
185 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
186 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
187 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
188 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
189
190 struct ext4_map_blocks {
191 ext4_fsblk_t m_pblk;
192 ext4_lblk_t m_lblk;
193 unsigned int m_len;
194 unsigned int m_flags;
195 };
196
197 /*
198 * Block validity checking, system zone rbtree.
199 */
200 struct ext4_system_blocks {
201 struct rb_root root;
202 struct rcu_head rcu;
203 };
204
205 /*
206 * Flags for ext4_io_end->flags
207 */
208 #define EXT4_IO_END_UNWRITTEN 0x0001
209
210 /*
211 * For converting unwritten extents on a work queue. 'handle' is used for
212 * buffered writeback.
213 */
214 typedef struct ext4_io_end {
215 struct list_head list; /* per-file finished IO list */
216 handle_t *handle; /* handle reserved for extent
217 * conversion */
218 struct inode *inode; /* file being written to */
219 struct bio *bio; /* Linked list of completed
220 * bios covering the extent */
221 unsigned int flag; /* unwritten or not */
222 atomic_t count; /* reference counter */
223 loff_t offset; /* offset in the file */
224 ssize_t size; /* size of the extent */
225 } ext4_io_end_t;
226
227 struct ext4_io_submit {
228 struct writeback_control *io_wbc;
229 struct bio *io_bio;
230 ext4_io_end_t *io_end;
231 sector_t io_next_block;
232 };
233
234 /*
235 * Special inodes numbers
236 */
237 #define EXT4_BAD_INO 1 /* Bad blocks inode */
238 #define EXT4_ROOT_INO 2 /* Root inode */
239 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
240 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
241 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
242 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
243 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
244 #define EXT4_JOURNAL_INO 8 /* Journal inode */
245
246 /* First non-reserved inode for old ext4 filesystems */
247 #define EXT4_GOOD_OLD_FIRST_INO 11
248
249 /*
250 * Maximal count of links to a file
251 */
252 #define EXT4_LINK_MAX 65000
253
254 /*
255 * Macro-instructions used to manage several block sizes
256 */
257 #define EXT4_MIN_BLOCK_SIZE 1024
258 #define EXT4_MAX_BLOCK_SIZE 65536
259 #define EXT4_MIN_BLOCK_LOG_SIZE 10
260 #define EXT4_MAX_BLOCK_LOG_SIZE 16
261 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
262 #ifdef __KERNEL__
263 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
264 #else
265 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
266 #endif
267 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
268 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
269 EXT4_SB(s)->s_cluster_bits)
270 #ifdef __KERNEL__
271 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
272 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
273 #else
274 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
275 #endif
276 #ifdef __KERNEL__
277 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
278 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
279 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
280 #else
281 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
282 EXT4_GOOD_OLD_INODE_SIZE : \
283 (s)->s_inode_size)
284 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
285 EXT4_GOOD_OLD_FIRST_INO : \
286 (s)->s_first_ino)
287 #endif
288 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
289 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
290 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
291 blkbits))
292
293 /* Translate a block number to a cluster number */
294 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
295 /* Translate a cluster number to a block number */
296 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
297 /* Translate # of blks to # of clusters */
298 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
299 (sbi)->s_cluster_bits)
300 /* Mask out the low bits to get the starting block of the cluster */
301 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
302 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
303 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
304 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
305 /* Get the cluster offset */
306 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
307 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
308 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
309 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
310
311 /*
312 * Structure of a blocks group descriptor
313 */
314 struct ext4_group_desc
315 {
316 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
317 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
318 __le32 bg_inode_table_lo; /* Inodes table block */
319 __le16 bg_free_blocks_count_lo;/* Free blocks count */
320 __le16 bg_free_inodes_count_lo;/* Free inodes count */
321 __le16 bg_used_dirs_count_lo; /* Directories count */
322 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
323 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
324 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
325 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
326 __le16 bg_itable_unused_lo; /* Unused inodes count */
327 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
328 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
329 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
330 __le32 bg_inode_table_hi; /* Inodes table block MSB */
331 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
332 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
333 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
334 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
335 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
336 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
337 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
338 __u32 bg_reserved;
339 };
340
341 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
342 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
343 sizeof(__le16))
344 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
345 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
346 sizeof(__le16))
347
348 /*
349 * Structure of a flex block group info
350 */
351
352 struct flex_groups {
353 atomic64_t free_clusters;
354 atomic_t free_inodes;
355 atomic_t used_dirs;
356 };
357
358 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
359 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
360 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
361
362 /*
363 * Macro-instructions used to manage group descriptors
364 */
365 #define EXT4_MIN_DESC_SIZE 32
366 #define EXT4_MIN_DESC_SIZE_64BIT 64
367 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
368 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
369 #ifdef __KERNEL__
370 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
371 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
372 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
373 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
374 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
375 #else
376 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
377 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
378 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
379 #endif
380
381 /*
382 * Constants relative to the data blocks
383 */
384 #define EXT4_NDIR_BLOCKS 12
385 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
386 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
387 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
388 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
389
390 /*
391 * Inode flags
392 */
393 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
394 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
395 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
396 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
397 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
398 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
399 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
400 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
401 /* Reserved for compression usage... */
402 #define EXT4_DIRTY_FL 0x00000100
403 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
404 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
405 /* nb: was previously EXT2_ECOMPR_FL */
406 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
407 /* End compression flags --- maybe not all used */
408 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
409 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
410 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
411 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
412 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
413 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
414 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
415 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
416 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
417 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
418 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
419 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
420 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
421
422 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */
423 #define EXT4_FL_USER_MODIFIABLE 0x204BC0FF /* User modifiable flags */
424
425 /* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
426 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
427 EXT4_IMMUTABLE_FL | \
428 EXT4_APPEND_FL | \
429 EXT4_NODUMP_FL | \
430 EXT4_NOATIME_FL | \
431 EXT4_PROJINHERIT_FL)
432
433 /* Flags that should be inherited by new inodes from their parent. */
434 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
435 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
436 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
437 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
438 EXT4_PROJINHERIT_FL)
439
440 /* Flags that are appropriate for regular files (all but dir-specific ones). */
441 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
442
443 /* Flags that are appropriate for non-directories/regular files. */
444 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
445
446 /* The only flags that should be swapped */
447 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
448
449 /* Mask out flags that are inappropriate for the given type of inode. */
450 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
451 {
452 if (S_ISDIR(mode))
453 return flags;
454 else if (S_ISREG(mode))
455 return flags & EXT4_REG_FLMASK;
456 else
457 return flags & EXT4_OTHER_FLMASK;
458 }
459
460 /*
461 * Inode flags used for atomic set/get
462 */
463 enum {
464 EXT4_INODE_SECRM = 0, /* Secure deletion */
465 EXT4_INODE_UNRM = 1, /* Undelete */
466 EXT4_INODE_COMPR = 2, /* Compress file */
467 EXT4_INODE_SYNC = 3, /* Synchronous updates */
468 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
469 EXT4_INODE_APPEND = 5, /* writes to file may only append */
470 EXT4_INODE_NODUMP = 6, /* do not dump file */
471 EXT4_INODE_NOATIME = 7, /* do not update atime */
472 /* Reserved for compression usage... */
473 EXT4_INODE_DIRTY = 8,
474 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
475 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
476 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
477 /* End compression flags --- maybe not all used */
478 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
479 EXT4_INODE_IMAGIC = 13, /* AFS directory */
480 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
481 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
482 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
483 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
484 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
485 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
486 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
487 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
488 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
489 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
490 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
491 };
492
493 /*
494 * Since it's pretty easy to mix up bit numbers and hex values, we use a
495 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
496 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
497 * any extra space in the compiled kernel image, otherwise, the build will fail.
498 * It's important that these values are the same, since we are using
499 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
500 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
501 * values found in ext2, ext3 and ext4 filesystems, and of course the values
502 * defined in e2fsprogs.
503 *
504 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
505 */
506 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
507 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
508
509 static inline void ext4_check_flag_values(void)
510 {
511 CHECK_FLAG_VALUE(SECRM);
512 CHECK_FLAG_VALUE(UNRM);
513 CHECK_FLAG_VALUE(COMPR);
514 CHECK_FLAG_VALUE(SYNC);
515 CHECK_FLAG_VALUE(IMMUTABLE);
516 CHECK_FLAG_VALUE(APPEND);
517 CHECK_FLAG_VALUE(NODUMP);
518 CHECK_FLAG_VALUE(NOATIME);
519 CHECK_FLAG_VALUE(DIRTY);
520 CHECK_FLAG_VALUE(COMPRBLK);
521 CHECK_FLAG_VALUE(NOCOMPR);
522 CHECK_FLAG_VALUE(ENCRYPT);
523 CHECK_FLAG_VALUE(INDEX);
524 CHECK_FLAG_VALUE(IMAGIC);
525 CHECK_FLAG_VALUE(JOURNAL_DATA);
526 CHECK_FLAG_VALUE(NOTAIL);
527 CHECK_FLAG_VALUE(DIRSYNC);
528 CHECK_FLAG_VALUE(TOPDIR);
529 CHECK_FLAG_VALUE(HUGE_FILE);
530 CHECK_FLAG_VALUE(EXTENTS);
531 CHECK_FLAG_VALUE(EA_INODE);
532 CHECK_FLAG_VALUE(EOFBLOCKS);
533 CHECK_FLAG_VALUE(INLINE_DATA);
534 CHECK_FLAG_VALUE(PROJINHERIT);
535 CHECK_FLAG_VALUE(RESERVED);
536 }
537
538 /* Used to pass group descriptor data when online resize is done */
539 struct ext4_new_group_input {
540 __u32 group; /* Group number for this data */
541 __u64 block_bitmap; /* Absolute block number of block bitmap */
542 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
543 __u64 inode_table; /* Absolute block number of inode table start */
544 __u32 blocks_count; /* Total number of blocks in this group */
545 __u16 reserved_blocks; /* Number of reserved blocks in this group */
546 __u16 unused;
547 };
548
549 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
550 struct compat_ext4_new_group_input {
551 u32 group;
552 compat_u64 block_bitmap;
553 compat_u64 inode_bitmap;
554 compat_u64 inode_table;
555 u32 blocks_count;
556 u16 reserved_blocks;
557 u16 unused;
558 };
559 #endif
560
561 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
562 struct ext4_new_group_data {
563 __u32 group;
564 __u64 block_bitmap;
565 __u64 inode_bitmap;
566 __u64 inode_table;
567 __u32 blocks_count;
568 __u16 reserved_blocks;
569 __u16 mdata_blocks;
570 __u32 free_clusters_count;
571 };
572
573 /* Indexes used to index group tables in ext4_new_group_data */
574 enum {
575 BLOCK_BITMAP = 0, /* block bitmap */
576 INODE_BITMAP, /* inode bitmap */
577 INODE_TABLE, /* inode tables */
578 GROUP_TABLE_COUNT,
579 };
580
581 /*
582 * Flags used by ext4_map_blocks()
583 */
584 /* Allocate any needed blocks and/or convert an unwritten
585 extent to be an initialized ext4 */
586 #define EXT4_GET_BLOCKS_CREATE 0x0001
587 /* Request the creation of an unwritten extent */
588 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
589 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
590 EXT4_GET_BLOCKS_CREATE)
591 /* Caller is from the delayed allocation writeout path
592 * finally doing the actual allocation of delayed blocks */
593 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
594 /* caller is from the direct IO path, request to creation of an
595 unwritten extents if not allocated, split the unwritten
596 extent if blocks has been preallocated already*/
597 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
598 #define EXT4_GET_BLOCKS_CONVERT 0x0010
599 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
600 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
601 /* Convert extent to initialized after IO complete */
602 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
603 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
604 /* Eventual metadata allocation (due to growing extent tree)
605 * should not fail, so try to use reserved blocks for that.*/
606 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
607 /* Don't normalize allocation size (used for fallocate) */
608 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
609 /* Request will not result in inode size update (user for fallocate) */
610 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
611 /* Convert written extents to unwritten */
612 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
613 /* Write zeros to newly created written extents */
614 #define EXT4_GET_BLOCKS_ZERO 0x0200
615 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
616 EXT4_GET_BLOCKS_ZERO)
617 /* Caller will submit data before dropping transaction handle. This
618 * allows jbd2 to avoid submitting data before commit. */
619 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
620
621 /*
622 * The bit position of these flags must not overlap with any of the
623 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
624 * read_extent_tree_block(), ext4_split_extent_at(),
625 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
626 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
627 * caching the extents when reading from the extent tree while a
628 * truncate or punch hole operation is in progress.
629 */
630 #define EXT4_EX_NOCACHE 0x40000000
631 #define EXT4_EX_FORCE_CACHE 0x20000000
632
633 /*
634 * Flags used by ext4_free_blocks
635 */
636 #define EXT4_FREE_BLOCKS_METADATA 0x0001
637 #define EXT4_FREE_BLOCKS_FORGET 0x0002
638 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
639 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
640 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
641 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
642
643 /*
644 * ioctl commands
645 */
646 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
647 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
648 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
649 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
650 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
651 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
652 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
653 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
654 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
655 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
656 #define EXT4_IOC_MIGRATE _IO('f', 9)
657 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
658 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
659 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
660 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
661 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
662 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
663 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
664 #define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
665 #define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
666 #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
667
668 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
669 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
670
671 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
672
673 /*
674 * Flags for going down operation
675 */
676 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
677 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
678 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
679
680
681 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
682 /*
683 * ioctl commands in 32 bit emulation
684 */
685 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
686 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
687 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
688 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
689 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
690 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
691 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
692 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
693 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
694 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
695 #endif
696
697 /* Max physical block we can address w/o extents */
698 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
699
700 /* Max logical block we can support */
701 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF
702
703 /*
704 * Structure of an inode on the disk
705 */
706 struct ext4_inode {
707 __le16 i_mode; /* File mode */
708 __le16 i_uid; /* Low 16 bits of Owner Uid */
709 __le32 i_size_lo; /* Size in bytes */
710 __le32 i_atime; /* Access time */
711 __le32 i_ctime; /* Inode Change time */
712 __le32 i_mtime; /* Modification time */
713 __le32 i_dtime; /* Deletion Time */
714 __le16 i_gid; /* Low 16 bits of Group Id */
715 __le16 i_links_count; /* Links count */
716 __le32 i_blocks_lo; /* Blocks count */
717 __le32 i_flags; /* File flags */
718 union {
719 struct {
720 __le32 l_i_version;
721 } linux1;
722 struct {
723 __u32 h_i_translator;
724 } hurd1;
725 struct {
726 __u32 m_i_reserved1;
727 } masix1;
728 } osd1; /* OS dependent 1 */
729 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
730 __le32 i_generation; /* File version (for NFS) */
731 __le32 i_file_acl_lo; /* File ACL */
732 __le32 i_size_high;
733 __le32 i_obso_faddr; /* Obsoleted fragment address */
734 union {
735 struct {
736 __le16 l_i_blocks_high; /* were l_i_reserved1 */
737 __le16 l_i_file_acl_high;
738 __le16 l_i_uid_high; /* these 2 fields */
739 __le16 l_i_gid_high; /* were reserved2[0] */
740 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
741 __le16 l_i_reserved;
742 } linux2;
743 struct {
744 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
745 __u16 h_i_mode_high;
746 __u16 h_i_uid_high;
747 __u16 h_i_gid_high;
748 __u32 h_i_author;
749 } hurd2;
750 struct {
751 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
752 __le16 m_i_file_acl_high;
753 __u32 m_i_reserved2[2];
754 } masix2;
755 } osd2; /* OS dependent 2 */
756 __le16 i_extra_isize;
757 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
758 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
759 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
760 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
761 __le32 i_crtime; /* File Creation time */
762 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
763 __le32 i_version_hi; /* high 32 bits for 64-bit version */
764 __le32 i_projid; /* Project ID */
765 };
766
767 struct move_extent {
768 __u32 reserved; /* should be zero */
769 __u32 donor_fd; /* donor file descriptor */
770 __u64 orig_start; /* logical start offset in block for orig */
771 __u64 donor_start; /* logical start offset in block for donor */
772 __u64 len; /* block length to be moved */
773 __u64 moved_len; /* moved block length */
774 };
775
776 #define EXT4_EPOCH_BITS 2
777 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
778 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
779
780 /*
781 * Extended fields will fit into an inode if the filesystem was formatted
782 * with large inodes (-I 256 or larger) and there are not currently any EAs
783 * consuming all of the available space. For new inodes we always reserve
784 * enough space for the kernel's known extended fields, but for inodes
785 * created with an old kernel this might not have been the case. None of
786 * the extended inode fields is critical for correct filesystem operation.
787 * This macro checks if a certain field fits in the inode. Note that
788 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
789 */
790 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
791 ((offsetof(typeof(*ext4_inode), field) + \
792 sizeof((ext4_inode)->field)) \
793 <= (EXT4_GOOD_OLD_INODE_SIZE + \
794 (einode)->i_extra_isize)) \
795
796 /*
797 * We use an encoding that preserves the times for extra epoch "00":
798 *
799 * extra msb of adjust for signed
800 * epoch 32-bit 32-bit tv_sec to
801 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
802 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
803 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
804 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
805 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
806 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
807 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
808 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
809 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
810 *
811 * Note that previous versions of the kernel on 64-bit systems would
812 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
813 * 1970. e2fsck will correct this, assuming that it is run on the
814 * affected filesystem before 2242.
815 */
816
817 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
818 {
819 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
820 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
821 }
822
823 static inline void ext4_decode_extra_time(struct timespec64 *time,
824 __le32 extra)
825 {
826 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
827
828 #if 1
829 /* Handle legacy encoding of pre-1970 dates with epoch
830 * bits 1,1. (This backwards compatibility may be removed
831 * at the discretion of the ext4 developers.)
832 */
833 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
834 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
835 extra_bits = 0;
836 time->tv_sec += extra_bits << 32;
837 #else
838 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
839 #endif
840 }
841 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
842 }
843
844 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
845 do { \
846 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
847 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
848 (raw_inode)->xtime ## _extra = \
849 ext4_encode_extra_time(&(inode)->xtime); \
850 } \
851 } while (0)
852
853 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
854 do { \
855 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
856 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
857 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
858 (raw_inode)->xtime ## _extra = \
859 ext4_encode_extra_time(&(einode)->xtime); \
860 } while (0)
861
862 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
863 do { \
864 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
865 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
866 ext4_decode_extra_time(&(inode)->xtime, \
867 raw_inode->xtime ## _extra); \
868 } \
869 else \
870 (inode)->xtime.tv_nsec = 0; \
871 } while (0)
872
873
874 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
875 do { \
876 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
877 (einode)->xtime.tv_sec = \
878 (signed)le32_to_cpu((raw_inode)->xtime); \
879 else \
880 (einode)->xtime.tv_sec = 0; \
881 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
882 ext4_decode_extra_time(&(einode)->xtime, \
883 raw_inode->xtime ## _extra); \
884 else \
885 (einode)->xtime.tv_nsec = 0; \
886 } while (0)
887
888 #define i_disk_version osd1.linux1.l_i_version
889
890 #if defined(__KERNEL__) || defined(__linux__)
891 #define i_reserved1 osd1.linux1.l_i_reserved1
892 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
893 #define i_blocks_high osd2.linux2.l_i_blocks_high
894 #define i_uid_low i_uid
895 #define i_gid_low i_gid
896 #define i_uid_high osd2.linux2.l_i_uid_high
897 #define i_gid_high osd2.linux2.l_i_gid_high
898 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
899
900 #elif defined(__GNU__)
901
902 #define i_translator osd1.hurd1.h_i_translator
903 #define i_uid_high osd2.hurd2.h_i_uid_high
904 #define i_gid_high osd2.hurd2.h_i_gid_high
905 #define i_author osd2.hurd2.h_i_author
906
907 #elif defined(__masix__)
908
909 #define i_reserved1 osd1.masix1.m_i_reserved1
910 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
911 #define i_reserved2 osd2.masix2.m_i_reserved2
912
913 #endif /* defined(__KERNEL__) || defined(__linux__) */
914
915 #include "extents_status.h"
916
917 /*
918 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
919 *
920 * These are needed to avoid lockdep false positives when we need to
921 * allocate blocks to the quota inode during ext4_map_blocks(), while
922 * holding i_data_sem for a normal (non-quota) inode. Since we don't
923 * do quota tracking for the quota inode, this avoids deadlock (as
924 * well as infinite recursion, since it isn't turtles all the way
925 * down...)
926 *
927 * I_DATA_SEM_NORMAL - Used for most inodes
928 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
929 * where the second inode has larger inode number
930 * than the first
931 * I_DATA_SEM_QUOTA - Used for quota inodes only
932 */
933 enum {
934 I_DATA_SEM_NORMAL = 0,
935 I_DATA_SEM_OTHER,
936 I_DATA_SEM_QUOTA,
937 };
938
939
940 /*
941 * fourth extended file system inode data in memory
942 */
943 struct ext4_inode_info {
944 __le32 i_data[15]; /* unconverted */
945 __u32 i_dtime;
946 ext4_fsblk_t i_file_acl;
947
948 /*
949 * i_block_group is the number of the block group which contains
950 * this file's inode. Constant across the lifetime of the inode,
951 * it is used for making block allocation decisions - we try to
952 * place a file's data blocks near its inode block, and new inodes
953 * near to their parent directory's inode.
954 */
955 ext4_group_t i_block_group;
956 ext4_lblk_t i_dir_start_lookup;
957 #if (BITS_PER_LONG < 64)
958 unsigned long i_state_flags; /* Dynamic state flags */
959 #endif
960 unsigned long i_flags;
961
962 /*
963 * Extended attributes can be read independently of the main file
964 * data. Taking i_mutex even when reading would cause contention
965 * between readers of EAs and writers of regular file data, so
966 * instead we synchronize on xattr_sem when reading or changing
967 * EAs.
968 */
969 struct rw_semaphore xattr_sem;
970
971 struct list_head i_orphan; /* unlinked but open inodes */
972
973 /*
974 * i_disksize keeps track of what the inode size is ON DISK, not
975 * in memory. During truncate, i_size is set to the new size by
976 * the VFS prior to calling ext4_truncate(), but the filesystem won't
977 * set i_disksize to 0 until the truncate is actually under way.
978 *
979 * The intent is that i_disksize always represents the blocks which
980 * are used by this file. This allows recovery to restart truncate
981 * on orphans if we crash during truncate. We actually write i_disksize
982 * into the on-disk inode when writing inodes out, instead of i_size.
983 *
984 * The only time when i_disksize and i_size may be different is when
985 * a truncate is in progress. The only things which change i_disksize
986 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
987 */
988 loff_t i_disksize;
989
990 /*
991 * i_data_sem is for serialising ext4_truncate() against
992 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
993 * data tree are chopped off during truncate. We can't do that in
994 * ext4 because whenever we perform intermediate commits during
995 * truncate, the inode and all the metadata blocks *must* be in a
996 * consistent state which allows truncation of the orphans to restart
997 * during recovery. Hence we must fix the get_block-vs-truncate race
998 * by other means, so we have i_data_sem.
999 */
1000 struct rw_semaphore i_data_sem;
1001 /*
1002 * i_mmap_sem is for serializing page faults with truncate / punch hole
1003 * operations. We have to make sure that new page cannot be faulted in
1004 * a section of the inode that is being punched. We cannot easily use
1005 * i_data_sem for this since we need protection for the whole punch
1006 * operation and i_data_sem ranks below transaction start so we have
1007 * to occasionally drop it.
1008 */
1009 struct rw_semaphore i_mmap_sem;
1010 struct inode vfs_inode;
1011 struct jbd2_inode *jinode;
1012
1013 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1014
1015 /*
1016 * File creation time. Its function is same as that of
1017 * struct timespec64 i_{a,c,m}time in the generic inode.
1018 */
1019 struct timespec64 i_crtime;
1020
1021 /* mballoc */
1022 struct list_head i_prealloc_list;
1023 spinlock_t i_prealloc_lock;
1024
1025 /* extents status tree */
1026 struct ext4_es_tree i_es_tree;
1027 rwlock_t i_es_lock;
1028 struct list_head i_es_list;
1029 unsigned int i_es_all_nr; /* protected by i_es_lock */
1030 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1031 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1032 extents to shrink. Protected by
1033 i_es_lock */
1034
1035 /* ialloc */
1036 ext4_group_t i_last_alloc_group;
1037
1038 /* allocation reservation info for delalloc */
1039 /* In case of bigalloc, this refer to clusters rather than blocks */
1040 unsigned int i_reserved_data_blocks;
1041 ext4_lblk_t i_da_metadata_calc_last_lblock;
1042 int i_da_metadata_calc_len;
1043
1044 /* on-disk additional length */
1045 __u16 i_extra_isize;
1046
1047 /* Indicate the inline data space. */
1048 u16 i_inline_off;
1049 u16 i_inline_size;
1050
1051 #ifdef CONFIG_QUOTA
1052 /* quota space reservation, managed internally by quota code */
1053 qsize_t i_reserved_quota;
1054 #endif
1055
1056 /* Lock protecting lists below */
1057 spinlock_t i_completed_io_lock;
1058 /*
1059 * Completed IOs that need unwritten extents handling and have
1060 * transaction reserved
1061 */
1062 struct list_head i_rsv_conversion_list;
1063 struct work_struct i_rsv_conversion_work;
1064 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1065
1066 spinlock_t i_block_reservation_lock;
1067
1068 /*
1069 * Transactions that contain inode's metadata needed to complete
1070 * fsync and fdatasync, respectively.
1071 */
1072 tid_t i_sync_tid;
1073 tid_t i_datasync_tid;
1074
1075 #ifdef CONFIG_QUOTA
1076 struct dquot *i_dquot[MAXQUOTAS];
1077 #endif
1078
1079 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1080 __u32 i_csum_seed;
1081
1082 kprojid_t i_projid;
1083 };
1084
1085 /*
1086 * File system states
1087 */
1088 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1089 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1090 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1091
1092 /*
1093 * Misc. filesystem flags
1094 */
1095 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1096 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1097 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1098
1099 /*
1100 * Mount flags set via mount options or defaults
1101 */
1102 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1103 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1104 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1105 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1106 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1107 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1108 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1109 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1110 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1111 #ifdef CONFIG_FS_DAX
1112 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
1113 #else
1114 #define EXT4_MOUNT_DAX 0
1115 #endif
1116 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1117 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1118 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1119 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1120 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1121 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1122 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1123 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1124 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1125 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1126 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1127 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1128 * enable enforcement for hidden
1129 * quota files */
1130 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1131 * enforcement for hidden quota
1132 * files */
1133 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1134 * enforcement */
1135 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1136 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1137 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1138 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1139 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1140 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1141 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1142 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1143 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1144
1145 /*
1146 * Mount flags set either automatically (could not be set by mount option)
1147 * based on per file system feature or property or in special cases such as
1148 * distinguishing between explicit mount option definition and default.
1149 */
1150 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1151 specified delalloc */
1152 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1153 size of blocksize * 8
1154 blocks */
1155 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1156 file systems */
1157
1158 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1159 specified journal checksum */
1160
1161 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1162 ~EXT4_MOUNT_##opt
1163 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1164 EXT4_MOUNT_##opt
1165 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1166 EXT4_MOUNT_##opt)
1167
1168 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1169 ~EXT4_MOUNT2_##opt
1170 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1171 EXT4_MOUNT2_##opt
1172 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1173 EXT4_MOUNT2_##opt)
1174
1175 #define ext4_test_and_set_bit __test_and_set_bit_le
1176 #define ext4_set_bit __set_bit_le
1177 #define ext4_set_bit_atomic ext2_set_bit_atomic
1178 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1179 #define ext4_clear_bit __clear_bit_le
1180 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1181 #define ext4_test_bit test_bit_le
1182 #define ext4_find_next_zero_bit find_next_zero_bit_le
1183 #define ext4_find_next_bit find_next_bit_le
1184
1185 extern void ext4_set_bits(void *bm, int cur, int len);
1186
1187 /*
1188 * Maximal mount counts between two filesystem checks
1189 */
1190 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1191 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1192
1193 /*
1194 * Behaviour when detecting errors
1195 */
1196 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1197 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1198 #define EXT4_ERRORS_PANIC 3 /* Panic */
1199 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1200
1201 /* Metadata checksum algorithm codes */
1202 #define EXT4_CRC32C_CHKSUM 1
1203
1204 /*
1205 * Structure of the super block
1206 */
1207 struct ext4_super_block {
1208 /*00*/ __le32 s_inodes_count; /* Inodes count */
1209 __le32 s_blocks_count_lo; /* Blocks count */
1210 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1211 __le32 s_free_blocks_count_lo; /* Free blocks count */
1212 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1213 __le32 s_first_data_block; /* First Data Block */
1214 __le32 s_log_block_size; /* Block size */
1215 __le32 s_log_cluster_size; /* Allocation cluster size */
1216 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1217 __le32 s_clusters_per_group; /* # Clusters per group */
1218 __le32 s_inodes_per_group; /* # Inodes per group */
1219 __le32 s_mtime; /* Mount time */
1220 /*30*/ __le32 s_wtime; /* Write time */
1221 __le16 s_mnt_count; /* Mount count */
1222 __le16 s_max_mnt_count; /* Maximal mount count */
1223 __le16 s_magic; /* Magic signature */
1224 __le16 s_state; /* File system state */
1225 __le16 s_errors; /* Behaviour when detecting errors */
1226 __le16 s_minor_rev_level; /* minor revision level */
1227 /*40*/ __le32 s_lastcheck; /* time of last check */
1228 __le32 s_checkinterval; /* max. time between checks */
1229 __le32 s_creator_os; /* OS */
1230 __le32 s_rev_level; /* Revision level */
1231 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1232 __le16 s_def_resgid; /* Default gid for reserved blocks */
1233 /*
1234 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1235 *
1236 * Note: the difference between the compatible feature set and
1237 * the incompatible feature set is that if there is a bit set
1238 * in the incompatible feature set that the kernel doesn't
1239 * know about, it should refuse to mount the filesystem.
1240 *
1241 * e2fsck's requirements are more strict; if it doesn't know
1242 * about a feature in either the compatible or incompatible
1243 * feature set, it must abort and not try to meddle with
1244 * things it doesn't understand...
1245 */
1246 __le32 s_first_ino; /* First non-reserved inode */
1247 __le16 s_inode_size; /* size of inode structure */
1248 __le16 s_block_group_nr; /* block group # of this superblock */
1249 __le32 s_feature_compat; /* compatible feature set */
1250 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1251 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1252 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1253 /*78*/ char s_volume_name[16]; /* volume name */
1254 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1255 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1256 /*
1257 * Performance hints. Directory preallocation should only
1258 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1259 */
1260 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1261 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1262 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1263 /*
1264 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1265 */
1266 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1267 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1268 __le32 s_journal_dev; /* device number of journal file */
1269 __le32 s_last_orphan; /* start of list of inodes to delete */
1270 __le32 s_hash_seed[4]; /* HTREE hash seed */
1271 __u8 s_def_hash_version; /* Default hash version to use */
1272 __u8 s_jnl_backup_type;
1273 __le16 s_desc_size; /* size of group descriptor */
1274 /*100*/ __le32 s_default_mount_opts;
1275 __le32 s_first_meta_bg; /* First metablock block group */
1276 __le32 s_mkfs_time; /* When the filesystem was created */
1277 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1278 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1279 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1280 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1281 __le32 s_free_blocks_count_hi; /* Free blocks count */
1282 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1283 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1284 __le32 s_flags; /* Miscellaneous flags */
1285 __le16 s_raid_stride; /* RAID stride */
1286 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1287 __le64 s_mmp_block; /* Block for multi-mount protection */
1288 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1289 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1290 __u8 s_checksum_type; /* metadata checksum algorithm used */
1291 __u8 s_encryption_level; /* versioning level for encryption */
1292 __u8 s_reserved_pad; /* Padding to next 32bits */
1293 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1294 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1295 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1296 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1297 snapshot's future use */
1298 __le32 s_snapshot_list; /* inode number of the head of the
1299 on-disk snapshot list */
1300 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1301 __le32 s_error_count; /* number of fs errors */
1302 __le32 s_first_error_time; /* first time an error happened */
1303 __le32 s_first_error_ino; /* inode involved in first error */
1304 __le64 s_first_error_block; /* block involved of first error */
1305 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1306 __le32 s_first_error_line; /* line number where error happened */
1307 __le32 s_last_error_time; /* most recent time of an error */
1308 __le32 s_last_error_ino; /* inode involved in last error */
1309 __le32 s_last_error_line; /* line number where error happened */
1310 __le64 s_last_error_block; /* block involved of last error */
1311 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1312 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1313 __u8 s_mount_opts[64];
1314 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1315 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1316 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1317 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1318 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1319 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1320 __le32 s_lpf_ino; /* Location of the lost+found inode */
1321 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1322 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1323 __u8 s_wtime_hi;
1324 __u8 s_mtime_hi;
1325 __u8 s_mkfs_time_hi;
1326 __u8 s_lastcheck_hi;
1327 __u8 s_first_error_time_hi;
1328 __u8 s_last_error_time_hi;
1329 __u8 s_pad[2];
1330 __le32 s_reserved[96]; /* Padding to the end of the block */
1331 __le32 s_checksum; /* crc32c(superblock) */
1332 };
1333
1334 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1335
1336 #ifdef __KERNEL__
1337
1338 /*
1339 * run-time mount flags
1340 */
1341 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1342 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1343 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1344
1345 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1346 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1347 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1348 #else
1349 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1350 #endif
1351
1352 /* Number of quota types we support */
1353 #define EXT4_MAXQUOTAS 3
1354
1355 /*
1356 * fourth extended-fs super-block data in memory
1357 */
1358 struct ext4_sb_info {
1359 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1360 unsigned long s_inodes_per_block;/* Number of inodes per block */
1361 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1362 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1363 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1364 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1365 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1366 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1367 ext4_group_t s_groups_count; /* Number of groups in the fs */
1368 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1369 unsigned long s_overhead; /* # of fs overhead clusters */
1370 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1371 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1372 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1373 struct buffer_head * s_sbh; /* Buffer containing the super block */
1374 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1375 struct buffer_head * __rcu *s_group_desc;
1376 unsigned int s_mount_opt;
1377 unsigned int s_mount_opt2;
1378 unsigned int s_mount_flags;
1379 unsigned int s_def_mount_opt;
1380 ext4_fsblk_t s_sb_block;
1381 atomic64_t s_resv_clusters;
1382 kuid_t s_resuid;
1383 kgid_t s_resgid;
1384 unsigned short s_mount_state;
1385 unsigned short s_pad;
1386 int s_addr_per_block_bits;
1387 int s_desc_per_block_bits;
1388 int s_inode_size;
1389 int s_first_ino;
1390 unsigned int s_inode_readahead_blks;
1391 unsigned int s_inode_goal;
1392 u32 s_hash_seed[4];
1393 int s_def_hash_version;
1394 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1395 struct percpu_counter s_freeclusters_counter;
1396 struct percpu_counter s_freeinodes_counter;
1397 struct percpu_counter s_dirs_counter;
1398 struct percpu_counter s_dirtyclusters_counter;
1399 struct blockgroup_lock *s_blockgroup_lock;
1400 struct proc_dir_entry *s_proc;
1401 struct kobject s_kobj;
1402 struct completion s_kobj_unregister;
1403 struct super_block *s_sb;
1404
1405 /* Journaling */
1406 struct journal_s *s_journal;
1407 struct list_head s_orphan;
1408 struct mutex s_orphan_lock;
1409 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1410 unsigned long s_commit_interval;
1411 u32 s_max_batch_time;
1412 u32 s_min_batch_time;
1413 struct block_device *journal_bdev;
1414 #ifdef CONFIG_QUOTA
1415 /* Names of quota files with journalled quota */
1416 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1417 int s_jquota_fmt; /* Format of quota to use */
1418 #endif
1419 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1420 struct ext4_system_blocks __rcu *system_blks;
1421
1422 #ifdef EXTENTS_STATS
1423 /* ext4 extents stats */
1424 unsigned long s_ext_min;
1425 unsigned long s_ext_max;
1426 unsigned long s_depth_max;
1427 spinlock_t s_ext_stats_lock;
1428 unsigned long s_ext_blocks;
1429 unsigned long s_ext_extents;
1430 #endif
1431
1432 /* for buddy allocator */
1433 struct ext4_group_info ** __rcu *s_group_info;
1434 struct inode *s_buddy_cache;
1435 spinlock_t s_md_lock;
1436 unsigned short *s_mb_offsets;
1437 unsigned int *s_mb_maxs;
1438 unsigned int s_group_info_size;
1439 unsigned int s_mb_free_pending;
1440 struct list_head s_freed_data_list; /* List of blocks to be freed
1441 after commit completed */
1442
1443 /* tunables */
1444 unsigned long s_stripe;
1445 unsigned int s_mb_stream_request;
1446 unsigned int s_mb_max_to_scan;
1447 unsigned int s_mb_min_to_scan;
1448 unsigned int s_mb_stats;
1449 unsigned int s_mb_order2_reqs;
1450 unsigned int s_mb_group_prealloc;
1451 unsigned int s_max_dir_size_kb;
1452 /* where last allocation was done - for stream allocation */
1453 unsigned long s_mb_last_group;
1454 unsigned long s_mb_last_start;
1455
1456 /* stats for buddy allocator */
1457 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1458 atomic_t s_bal_success; /* we found long enough chunks */
1459 atomic_t s_bal_allocated; /* in blocks */
1460 atomic_t s_bal_ex_scanned; /* total extents scanned */
1461 atomic_t s_bal_goals; /* goal hits */
1462 atomic_t s_bal_breaks; /* too long searches */
1463 atomic_t s_bal_2orders; /* 2^order hits */
1464 spinlock_t s_bal_lock;
1465 unsigned long s_mb_buddies_generated;
1466 unsigned long long s_mb_generation_time;
1467 atomic_t s_mb_lost_chunks;
1468 atomic_t s_mb_preallocated;
1469 atomic_t s_mb_discarded;
1470 atomic_t s_lock_busy;
1471
1472 /* locality groups */
1473 struct ext4_locality_group __percpu *s_locality_groups;
1474
1475 /* for write statistics */
1476 unsigned long s_sectors_written_start;
1477 u64 s_kbytes_written;
1478
1479 /* the size of zero-out chunk */
1480 unsigned int s_extent_max_zeroout_kb;
1481
1482 unsigned int s_log_groups_per_flex;
1483 struct flex_groups * __rcu *s_flex_groups;
1484 ext4_group_t s_flex_groups_allocated;
1485
1486 /* workqueue for reserved extent conversions (buffered io) */
1487 struct workqueue_struct *rsv_conversion_wq;
1488
1489 /* timer for periodic error stats printing */
1490 struct timer_list s_err_report;
1491
1492 /* Lazy inode table initialization info */
1493 struct ext4_li_request *s_li_request;
1494 /* Wait multiplier for lazy initialization thread */
1495 unsigned int s_li_wait_mult;
1496
1497 /* Kernel thread for multiple mount protection */
1498 struct task_struct *s_mmp_tsk;
1499
1500 /* record the last minlen when FITRIM is called. */
1501 atomic_t s_last_trim_minblks;
1502
1503 /* Reference to checksum algorithm driver via cryptoapi */
1504 struct crypto_shash *s_chksum_driver;
1505
1506 /* Precomputed FS UUID checksum for seeding other checksums */
1507 __u32 s_csum_seed;
1508
1509 /* Reclaim extents from extent status tree */
1510 struct shrinker s_es_shrinker;
1511 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1512 long s_es_nr_inode;
1513 struct ext4_es_stats s_es_stats;
1514 struct mb_cache *s_ea_block_cache;
1515 struct mb_cache *s_ea_inode_cache;
1516 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1517
1518 /* Ratelimit ext4 messages. */
1519 struct ratelimit_state s_err_ratelimit_state;
1520 struct ratelimit_state s_warning_ratelimit_state;
1521 struct ratelimit_state s_msg_ratelimit_state;
1522
1523 /*
1524 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1525 * or EXTENTS flag.
1526 */
1527 struct percpu_rw_semaphore s_writepages_rwsem;
1528 struct dax_device *s_daxdev;
1529 };
1530
1531 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1532 {
1533 return sb->s_fs_info;
1534 }
1535 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1536 {
1537 return container_of(inode, struct ext4_inode_info, vfs_inode);
1538 }
1539
1540 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1541 {
1542 return ino == EXT4_ROOT_INO ||
1543 (ino >= EXT4_FIRST_INO(sb) &&
1544 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1545 }
1546
1547 /*
1548 * Returns: sbi->field[index]
1549 * Used to access an array element from the following sbi fields which require
1550 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1551 * - s_group_desc
1552 * - s_group_info
1553 * - s_flex_group
1554 */
1555 #define sbi_array_rcu_deref(sbi, field, index) \
1556 ({ \
1557 typeof(*((sbi)->field)) _v; \
1558 rcu_read_lock(); \
1559 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1560 rcu_read_unlock(); \
1561 _v; \
1562 })
1563
1564 /*
1565 * Inode dynamic state flags
1566 */
1567 enum {
1568 EXT4_STATE_JDATA, /* journaled data exists */
1569 EXT4_STATE_NEW, /* inode is newly created */
1570 EXT4_STATE_XATTR, /* has in-inode xattrs */
1571 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1572 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1573 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1574 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1575 EXT4_STATE_NEWENTRY, /* File just added to dir */
1576 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1577 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1578 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1579 };
1580
1581 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1582 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1583 { \
1584 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1585 } \
1586 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1587 { \
1588 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1589 } \
1590 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1591 { \
1592 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1593 }
1594
1595 /* Add these declarations here only so that these functions can be
1596 * found by name. Otherwise, they are very hard to locate. */
1597 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1598 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1599 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1600 EXT4_INODE_BIT_FNS(flag, flags, 0)
1601
1602 /* Add these declarations here only so that these functions can be
1603 * found by name. Otherwise, they are very hard to locate. */
1604 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1605 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1606 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1607 #if (BITS_PER_LONG < 64)
1608 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1609
1610 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1611 {
1612 (ei)->i_state_flags = 0;
1613 }
1614 #else
1615 EXT4_INODE_BIT_FNS(state, flags, 32)
1616
1617 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1618 {
1619 /* We depend on the fact that callers will set i_flags */
1620 }
1621 #endif
1622 #else
1623 /* Assume that user mode programs are passing in an ext4fs superblock, not
1624 * a kernel struct super_block. This will allow us to call the feature-test
1625 * macros from user land. */
1626 #define EXT4_SB(sb) (sb)
1627 #endif
1628
1629 /*
1630 * Returns true if the inode is inode is encrypted
1631 */
1632 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1633
1634 /*
1635 * Codes for operating systems
1636 */
1637 #define EXT4_OS_LINUX 0
1638 #define EXT4_OS_HURD 1
1639 #define EXT4_OS_MASIX 2
1640 #define EXT4_OS_FREEBSD 3
1641 #define EXT4_OS_LITES 4
1642
1643 /*
1644 * Revision levels
1645 */
1646 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1647 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1648
1649 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1650 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1651
1652 #define EXT4_GOOD_OLD_INODE_SIZE 128
1653
1654 /*
1655 * Feature set definitions
1656 */
1657
1658 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1659 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1660 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1661 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1662 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1663 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1664 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1665
1666 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1667 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1668 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1669 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1670 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1671 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1672 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1673 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1674 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1675 /*
1676 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1677 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1678 * all other data structures' checksums. However, the METADATA_CSUM and
1679 * GDT_CSUM bits are mutually exclusive.
1680 */
1681 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1682 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1683 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1684
1685 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1686 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1687 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1688 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1689 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1690 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1691 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1692 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1693 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1694 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1695 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1696 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1697 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1698 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1699 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1700
1701 extern void ext4_update_dynamic_rev(struct super_block *sb);
1702
1703 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1704 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1705 { \
1706 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1707 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1708 } \
1709 static inline void ext4_set_feature_##name(struct super_block *sb) \
1710 { \
1711 ext4_update_dynamic_rev(sb); \
1712 EXT4_SB(sb)->s_es->s_feature_compat |= \
1713 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1714 } \
1715 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1716 { \
1717 EXT4_SB(sb)->s_es->s_feature_compat &= \
1718 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1719 }
1720
1721 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1722 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1723 { \
1724 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1725 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1726 } \
1727 static inline void ext4_set_feature_##name(struct super_block *sb) \
1728 { \
1729 ext4_update_dynamic_rev(sb); \
1730 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1731 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1732 } \
1733 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1734 { \
1735 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1736 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1737 }
1738
1739 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1740 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1741 { \
1742 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1743 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1744 } \
1745 static inline void ext4_set_feature_##name(struct super_block *sb) \
1746 { \
1747 ext4_update_dynamic_rev(sb); \
1748 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1749 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1750 } \
1751 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1752 { \
1753 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1754 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1755 }
1756
1757 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
1758 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
1759 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
1760 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
1761 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
1762 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
1763 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
1764
1765 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
1766 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
1767 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
1768 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
1769 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
1770 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
1771 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
1772 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
1773 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
1774 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
1775 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
1776 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
1777
1778 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
1779 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
1780 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
1781 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
1782 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
1783 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
1784 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
1785 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
1786 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
1787 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
1788 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
1789 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
1790 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
1791 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
1792 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
1793
1794 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1795 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1796 EXT4_FEATURE_INCOMPAT_META_BG)
1797 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1798 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1799 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1800
1801 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1802 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1803 EXT4_FEATURE_INCOMPAT_RECOVER| \
1804 EXT4_FEATURE_INCOMPAT_META_BG)
1805 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1806 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1807 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1808
1809 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1810 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1811 EXT4_FEATURE_INCOMPAT_RECOVER| \
1812 EXT4_FEATURE_INCOMPAT_META_BG| \
1813 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1814 EXT4_FEATURE_INCOMPAT_64BIT| \
1815 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1816 EXT4_FEATURE_INCOMPAT_EA_INODE| \
1817 EXT4_FEATURE_INCOMPAT_MMP | \
1818 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1819 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1820 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1821 EXT4_FEATURE_INCOMPAT_LARGEDIR)
1822 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1823 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1824 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1825 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1826 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1827 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1828 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1829 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1830 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1831 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1832 EXT4_FEATURE_RO_COMPAT_PROJECT)
1833
1834 #define EXTN_FEATURE_FUNCS(ver) \
1835 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1836 { \
1837 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1838 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1839 } \
1840 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1841 { \
1842 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1843 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1844 } \
1845 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1846 { \
1847 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1848 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1849 }
1850
1851 EXTN_FEATURE_FUNCS(2)
1852 EXTN_FEATURE_FUNCS(3)
1853 EXTN_FEATURE_FUNCS(4)
1854
1855 static inline bool ext4_has_compat_features(struct super_block *sb)
1856 {
1857 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1858 }
1859 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1860 {
1861 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1862 }
1863 static inline bool ext4_has_incompat_features(struct super_block *sb)
1864 {
1865 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1866 }
1867
1868 /*
1869 * Superblock flags
1870 */
1871 #define EXT4_FLAGS_RESIZING 0
1872 #define EXT4_FLAGS_SHUTDOWN 1
1873
1874 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1875 {
1876 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1877 }
1878
1879
1880 /*
1881 * Default values for user and/or group using reserved blocks
1882 */
1883 #define EXT4_DEF_RESUID 0
1884 #define EXT4_DEF_RESGID 0
1885
1886 /*
1887 * Default project ID
1888 */
1889 #define EXT4_DEF_PROJID 0
1890
1891 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1892
1893 /*
1894 * Default mount options
1895 */
1896 #define EXT4_DEFM_DEBUG 0x0001
1897 #define EXT4_DEFM_BSDGROUPS 0x0002
1898 #define EXT4_DEFM_XATTR_USER 0x0004
1899 #define EXT4_DEFM_ACL 0x0008
1900 #define EXT4_DEFM_UID16 0x0010
1901 #define EXT4_DEFM_JMODE 0x0060
1902 #define EXT4_DEFM_JMODE_DATA 0x0020
1903 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1904 #define EXT4_DEFM_JMODE_WBACK 0x0060
1905 #define EXT4_DEFM_NOBARRIER 0x0100
1906 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1907 #define EXT4_DEFM_DISCARD 0x0400
1908 #define EXT4_DEFM_NODELALLOC 0x0800
1909
1910 /*
1911 * Default journal batch times
1912 */
1913 #define EXT4_DEF_MIN_BATCH_TIME 0
1914 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1915
1916 /*
1917 * Minimum number of groups in a flexgroup before we separate out
1918 * directories into the first block group of a flexgroup
1919 */
1920 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1921
1922 /*
1923 * Structure of a directory entry
1924 */
1925 #define EXT4_NAME_LEN 255
1926
1927 struct ext4_dir_entry {
1928 __le32 inode; /* Inode number */
1929 __le16 rec_len; /* Directory entry length */
1930 __le16 name_len; /* Name length */
1931 char name[EXT4_NAME_LEN]; /* File name */
1932 };
1933
1934 /*
1935 * The new version of the directory entry. Since EXT4 structures are
1936 * stored in intel byte order, and the name_len field could never be
1937 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1938 * file_type field.
1939 */
1940 struct ext4_dir_entry_2 {
1941 __le32 inode; /* Inode number */
1942 __le16 rec_len; /* Directory entry length */
1943 __u8 name_len; /* Name length */
1944 __u8 file_type;
1945 char name[EXT4_NAME_LEN]; /* File name */
1946 };
1947
1948 /*
1949 * This is a bogus directory entry at the end of each leaf block that
1950 * records checksums.
1951 */
1952 struct ext4_dir_entry_tail {
1953 __le32 det_reserved_zero1; /* Pretend to be unused */
1954 __le16 det_rec_len; /* 12 */
1955 __u8 det_reserved_zero2; /* Zero name length */
1956 __u8 det_reserved_ft; /* 0xDE, fake file type */
1957 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1958 };
1959
1960 #define EXT4_DIRENT_TAIL(block, blocksize) \
1961 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1962 ((blocksize) - \
1963 sizeof(struct ext4_dir_entry_tail))))
1964
1965 /*
1966 * Ext4 directory file types. Only the low 3 bits are used. The
1967 * other bits are reserved for now.
1968 */
1969 #define EXT4_FT_UNKNOWN 0
1970 #define EXT4_FT_REG_FILE 1
1971 #define EXT4_FT_DIR 2
1972 #define EXT4_FT_CHRDEV 3
1973 #define EXT4_FT_BLKDEV 4
1974 #define EXT4_FT_FIFO 5
1975 #define EXT4_FT_SOCK 6
1976 #define EXT4_FT_SYMLINK 7
1977
1978 #define EXT4_FT_MAX 8
1979
1980 #define EXT4_FT_DIR_CSUM 0xDE
1981
1982 /*
1983 * EXT4_DIR_PAD defines the directory entries boundaries
1984 *
1985 * NOTE: It must be a multiple of 4
1986 */
1987 #define EXT4_DIR_PAD 4
1988 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1989 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1990 ~EXT4_DIR_ROUND)
1991 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1992
1993 /*
1994 * If we ever get support for fs block sizes > page_size, we'll need
1995 * to remove the #if statements in the next two functions...
1996 */
1997 static inline unsigned int
1998 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1999 {
2000 unsigned len = le16_to_cpu(dlen);
2001
2002 #if (PAGE_SIZE >= 65536)
2003 if (len == EXT4_MAX_REC_LEN || len == 0)
2004 return blocksize;
2005 return (len & 65532) | ((len & 3) << 16);
2006 #else
2007 return len;
2008 #endif
2009 }
2010
2011 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2012 {
2013 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2014 BUG();
2015 #if (PAGE_SIZE >= 65536)
2016 if (len < 65536)
2017 return cpu_to_le16(len);
2018 if (len == blocksize) {
2019 if (blocksize == 65536)
2020 return cpu_to_le16(EXT4_MAX_REC_LEN);
2021 else
2022 return cpu_to_le16(0);
2023 }
2024 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2025 #else
2026 return cpu_to_le16(len);
2027 #endif
2028 }
2029
2030 /*
2031 * Hash Tree Directory indexing
2032 * (c) Daniel Phillips, 2001
2033 */
2034
2035 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2036 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2037 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2038 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2039 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2040
2041 /* Legal values for the dx_root hash_version field: */
2042
2043 #define DX_HASH_LEGACY 0
2044 #define DX_HASH_HALF_MD4 1
2045 #define DX_HASH_TEA 2
2046 #define DX_HASH_LEGACY_UNSIGNED 3
2047 #define DX_HASH_HALF_MD4_UNSIGNED 4
2048 #define DX_HASH_TEA_UNSIGNED 5
2049
2050 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2051 const void *address, unsigned int length)
2052 {
2053 struct {
2054 struct shash_desc shash;
2055 char ctx[4];
2056 } desc;
2057
2058 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2059
2060 desc.shash.tfm = sbi->s_chksum_driver;
2061 desc.shash.flags = 0;
2062 *(u32 *)desc.ctx = crc;
2063
2064 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2065
2066 return *(u32 *)desc.ctx;
2067 }
2068
2069 #ifdef __KERNEL__
2070
2071 /* hash info structure used by the directory hash */
2072 struct dx_hash_info
2073 {
2074 u32 hash;
2075 u32 minor_hash;
2076 int hash_version;
2077 u32 *seed;
2078 };
2079
2080
2081 /* 32 and 64 bit signed EOF for dx directories */
2082 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2083 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2084
2085
2086 /*
2087 * Control parameters used by ext4_htree_next_block
2088 */
2089 #define HASH_NB_ALWAYS 1
2090
2091 struct ext4_filename {
2092 const struct qstr *usr_fname;
2093 struct fscrypt_str disk_name;
2094 struct dx_hash_info hinfo;
2095 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2096 struct fscrypt_str crypto_buf;
2097 #endif
2098 };
2099
2100 #define fname_name(p) ((p)->disk_name.name)
2101 #define fname_len(p) ((p)->disk_name.len)
2102
2103 /*
2104 * Describe an inode's exact location on disk and in memory
2105 */
2106 struct ext4_iloc
2107 {
2108 struct buffer_head *bh;
2109 unsigned long offset;
2110 ext4_group_t block_group;
2111 };
2112
2113 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2114 {
2115 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2116 }
2117
2118 static inline bool ext4_is_quota_file(struct inode *inode)
2119 {
2120 return IS_NOQUOTA(inode) &&
2121 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2122 }
2123
2124 /*
2125 * This structure is stuffed into the struct file's private_data field
2126 * for directories. It is where we put information so that we can do
2127 * readdir operations in hash tree order.
2128 */
2129 struct dir_private_info {
2130 struct rb_root root;
2131 struct rb_node *curr_node;
2132 struct fname *extra_fname;
2133 loff_t last_pos;
2134 __u32 curr_hash;
2135 __u32 curr_minor_hash;
2136 __u32 next_hash;
2137 };
2138
2139 /* calculate the first block number of the group */
2140 static inline ext4_fsblk_t
2141 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2142 {
2143 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2144 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2145 }
2146
2147 /*
2148 * Special error return code only used by dx_probe() and its callers.
2149 */
2150 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2151
2152 /* htree levels for ext4 */
2153 #define EXT4_HTREE_LEVEL_COMPAT 2
2154 #define EXT4_HTREE_LEVEL 3
2155
2156 static inline int ext4_dir_htree_level(struct super_block *sb)
2157 {
2158 return ext4_has_feature_largedir(sb) ?
2159 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2160 }
2161
2162 /*
2163 * Timeout and state flag for lazy initialization inode thread.
2164 */
2165 #define EXT4_DEF_LI_WAIT_MULT 10
2166 #define EXT4_DEF_LI_MAX_START_DELAY 5
2167 #define EXT4_LAZYINIT_QUIT 0x0001
2168 #define EXT4_LAZYINIT_RUNNING 0x0002
2169
2170 /*
2171 * Lazy inode table initialization info
2172 */
2173 struct ext4_lazy_init {
2174 unsigned long li_state;
2175 struct list_head li_request_list;
2176 struct mutex li_list_mtx;
2177 };
2178
2179 struct ext4_li_request {
2180 struct super_block *lr_super;
2181 struct ext4_sb_info *lr_sbi;
2182 ext4_group_t lr_next_group;
2183 struct list_head lr_request;
2184 unsigned long lr_next_sched;
2185 unsigned long lr_timeout;
2186 };
2187
2188 struct ext4_features {
2189 struct kobject f_kobj;
2190 struct completion f_kobj_unregister;
2191 };
2192
2193 /*
2194 * This structure will be used for multiple mount protection. It will be
2195 * written into the block number saved in the s_mmp_block field in the
2196 * superblock. Programs that check MMP should assume that if
2197 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2198 * to use the filesystem, regardless of how old the timestamp is.
2199 */
2200 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2201 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2202 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2203 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2204
2205 struct mmp_struct {
2206 __le32 mmp_magic; /* Magic number for MMP */
2207 __le32 mmp_seq; /* Sequence no. updated periodically */
2208
2209 /*
2210 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2211 * purposes and do not affect the correctness of the algorithm
2212 */
2213 __le64 mmp_time; /* Time last updated */
2214 char mmp_nodename[64]; /* Node which last updated MMP block */
2215 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2216
2217 /*
2218 * mmp_check_interval is used to verify if the MMP block has been
2219 * updated on the block device. The value is updated based on the
2220 * maximum time to write the MMP block during an update cycle.
2221 */
2222 __le16 mmp_check_interval;
2223
2224 __le16 mmp_pad1;
2225 __le32 mmp_pad2[226];
2226 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2227 };
2228
2229 /* arguments passed to the mmp thread */
2230 struct mmpd_data {
2231 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2232 struct super_block *sb; /* super block of the fs */
2233 };
2234
2235 /*
2236 * Check interval multiplier
2237 * The MMP block is written every update interval and initially checked every
2238 * update interval x the multiplier (the value is then adapted based on the
2239 * write latency). The reason is that writes can be delayed under load and we
2240 * don't want readers to incorrectly assume that the filesystem is no longer
2241 * in use.
2242 */
2243 #define EXT4_MMP_CHECK_MULT 2UL
2244
2245 /*
2246 * Minimum interval for MMP checking in seconds.
2247 */
2248 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2249
2250 /*
2251 * Maximum interval for MMP checking in seconds.
2252 */
2253 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2254
2255 /*
2256 * Function prototypes
2257 */
2258
2259 /*
2260 * Ok, these declarations are also in <linux/kernel.h> but none of the
2261 * ext4 source programs needs to include it so they are duplicated here.
2262 */
2263 # define NORET_TYPE /**/
2264 # define ATTRIB_NORET __attribute__((noreturn))
2265 # define NORET_AND noreturn,
2266
2267 /* bitmap.c */
2268 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2269 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2270 struct ext4_group_desc *gdp,
2271 struct buffer_head *bh, int sz);
2272 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2273 struct ext4_group_desc *gdp,
2274 struct buffer_head *bh, int sz);
2275 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2276 struct ext4_group_desc *gdp,
2277 struct buffer_head *bh);
2278 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2279 struct ext4_group_desc *gdp,
2280 struct buffer_head *bh);
2281
2282 /* balloc.c */
2283 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2284 ext4_fsblk_t blocknr,
2285 ext4_group_t *blockgrpp,
2286 ext4_grpblk_t *offsetp);
2287 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2288 ext4_fsblk_t block);
2289
2290 extern unsigned int ext4_block_group(struct super_block *sb,
2291 ext4_fsblk_t blocknr);
2292 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2293 ext4_fsblk_t blocknr);
2294 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2295 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2296 ext4_group_t group);
2297 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2298 ext4_fsblk_t goal,
2299 unsigned int flags,
2300 unsigned long *count,
2301 int *errp);
2302 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2303 s64 nclusters, unsigned int flags);
2304 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2305 extern void ext4_check_blocks_bitmap(struct super_block *);
2306 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2307 ext4_group_t block_group,
2308 struct buffer_head ** bh);
2309 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2310
2311 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2312 ext4_group_t block_group);
2313 extern int ext4_wait_block_bitmap(struct super_block *sb,
2314 ext4_group_t block_group,
2315 struct buffer_head *bh);
2316 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2317 ext4_group_t block_group);
2318 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2319 ext4_group_t block_group,
2320 struct ext4_group_desc *gdp);
2321 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2322
2323 static inline bool ext4_encrypted_inode(struct inode *inode)
2324 {
2325 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
2326 }
2327
2328 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2329 static inline int ext4_fname_setup_filename(struct inode *dir,
2330 const struct qstr *iname,
2331 int lookup, struct ext4_filename *fname)
2332 {
2333 struct fscrypt_name name;
2334 int err;
2335
2336 memset(fname, 0, sizeof(struct ext4_filename));
2337
2338 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2339
2340 fname->usr_fname = name.usr_fname;
2341 fname->disk_name = name.disk_name;
2342 fname->hinfo.hash = name.hash;
2343 fname->hinfo.minor_hash = name.minor_hash;
2344 fname->crypto_buf = name.crypto_buf;
2345 return err;
2346 }
2347
2348 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2349 {
2350 struct fscrypt_name name;
2351
2352 name.crypto_buf = fname->crypto_buf;
2353 fscrypt_free_filename(&name);
2354
2355 fname->crypto_buf.name = NULL;
2356 fname->usr_fname = NULL;
2357 fname->disk_name.name = NULL;
2358 }
2359 #else
2360 static inline int ext4_fname_setup_filename(struct inode *dir,
2361 const struct qstr *iname,
2362 int lookup, struct ext4_filename *fname)
2363 {
2364 fname->usr_fname = iname;
2365 fname->disk_name.name = (unsigned char *) iname->name;
2366 fname->disk_name.len = iname->len;
2367 return 0;
2368 }
2369 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2370
2371 #endif
2372
2373 /* dir.c */
2374 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2375 struct file *,
2376 struct ext4_dir_entry_2 *,
2377 struct buffer_head *, char *, int,
2378 unsigned int);
2379 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2380 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2381 (de), (bh), (buf), (size), (offset)))
2382 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2383 __u32 minor_hash,
2384 struct ext4_dir_entry_2 *dirent,
2385 struct fscrypt_str *ent_name);
2386 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2387 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2388 struct buffer_head *bh,
2389 void *buf, int buf_size,
2390 struct ext4_filename *fname,
2391 struct ext4_dir_entry_2 **dest_de);
2392 void ext4_insert_dentry(struct inode *inode,
2393 struct ext4_dir_entry_2 *de,
2394 int buf_size,
2395 struct ext4_filename *fname);
2396 static inline void ext4_update_dx_flag(struct inode *inode)
2397 {
2398 if (!ext4_has_feature_dir_index(inode->i_sb)) {
2399 /* ext4_iget() should have caught this... */
2400 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2401 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2402 }
2403 }
2404 static const unsigned char ext4_filetype_table[] = {
2405 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2406 };
2407
2408 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2409 {
2410 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2411 return DT_UNKNOWN;
2412
2413 return ext4_filetype_table[filetype];
2414 }
2415 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2416 void *buf, int buf_size);
2417
2418 /* fsync.c */
2419 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2420
2421 /* hash.c */
2422 extern int ext4fs_dirhash(const char *name, int len, struct
2423 dx_hash_info *hinfo);
2424
2425 /* ialloc.c */
2426 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2427 const struct qstr *qstr, __u32 goal,
2428 uid_t *owner, __u32 i_flags,
2429 int handle_type, unsigned int line_no,
2430 int nblocks);
2431
2432 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2433 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2434 i_flags, 0, 0, 0)
2435 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2436 type, nblocks) \
2437 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2438 0, (type), __LINE__, (nblocks))
2439
2440
2441 extern void ext4_free_inode(handle_t *, struct inode *);
2442 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2443 extern unsigned long ext4_count_free_inodes(struct super_block *);
2444 extern unsigned long ext4_count_dirs(struct super_block *);
2445 extern void ext4_check_inodes_bitmap(struct super_block *);
2446 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2447 extern int ext4_init_inode_table(struct super_block *sb,
2448 ext4_group_t group, int barrier);
2449 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2450
2451 /* mballoc.c */
2452 extern const struct seq_operations ext4_mb_seq_groups_ops;
2453 extern long ext4_mb_stats;
2454 extern long ext4_mb_max_to_scan;
2455 extern int ext4_mb_init(struct super_block *);
2456 extern int ext4_mb_release(struct super_block *);
2457 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2458 struct ext4_allocation_request *, int *);
2459 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2460 extern void ext4_discard_preallocations(struct inode *);
2461 extern int __init ext4_init_mballoc(void);
2462 extern void ext4_exit_mballoc(void);
2463 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2464 struct buffer_head *bh, ext4_fsblk_t block,
2465 unsigned long count, int flags);
2466 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2467 ext4_group_t ngroups);
2468 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2469 ext4_group_t i, struct ext4_group_desc *desc);
2470 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2471 ext4_fsblk_t block, unsigned long count);
2472 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2473 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2474
2475 /* inode.c */
2476 int ext4_inode_is_fast_symlink(struct inode *inode);
2477 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2478 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2479 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2480 bool wait, struct buffer_head **bhs);
2481 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2482 struct buffer_head *bh_result, int create);
2483 int ext4_get_block(struct inode *inode, sector_t iblock,
2484 struct buffer_head *bh_result, int create);
2485 int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2486 struct buffer_head *bh_result, int create);
2487 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2488 struct buffer_head *bh, int create);
2489 int ext4_walk_page_buffers(handle_t *handle,
2490 struct buffer_head *head,
2491 unsigned from,
2492 unsigned to,
2493 int *partial,
2494 int (*fn)(handle_t *handle,
2495 struct buffer_head *bh));
2496 int do_journal_get_write_access(handle_t *handle,
2497 struct buffer_head *bh);
2498 #define FALL_BACK_TO_NONDELALLOC 1
2499 #define CONVERT_INLINE_DATA 2
2500
2501 typedef enum {
2502 EXT4_IGET_NORMAL = 0,
2503 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2504 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2505 } ext4_iget_flags;
2506
2507 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2508 ext4_iget_flags flags, const char *function,
2509 unsigned int line);
2510
2511 #define ext4_iget(sb, ino, flags) \
2512 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2513
2514 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2515 extern int ext4_setattr(struct dentry *, struct iattr *);
2516 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2517 extern void ext4_evict_inode(struct inode *);
2518 extern void ext4_clear_inode(struct inode *);
2519 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2520 extern int ext4_sync_inode(handle_t *, struct inode *);
2521 extern void ext4_dirty_inode(struct inode *, int);
2522 extern int ext4_change_inode_journal_flag(struct inode *, int);
2523 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2524 extern int ext4_inode_attach_jinode(struct inode *inode);
2525 extern int ext4_can_truncate(struct inode *inode);
2526 extern int ext4_truncate(struct inode *);
2527 extern int ext4_break_layouts(struct inode *);
2528 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2529 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2530 extern void ext4_set_inode_flags(struct inode *);
2531 extern int ext4_alloc_da_blocks(struct inode *inode);
2532 extern void ext4_set_aops(struct inode *inode);
2533 extern int ext4_writepage_trans_blocks(struct inode *);
2534 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2535 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2536 loff_t lstart, loff_t lend);
2537 extern int ext4_page_mkwrite(struct vm_fault *vmf);
2538 extern int ext4_filemap_fault(struct vm_fault *vmf);
2539 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2540 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2541 extern void ext4_da_update_reserve_space(struct inode *inode,
2542 int used, int quota_claim);
2543 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2544 ext4_fsblk_t pblk, ext4_lblk_t len);
2545
2546 /* indirect.c */
2547 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2548 struct ext4_map_blocks *map, int flags);
2549 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2550 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2551 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2552 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2553 ext4_lblk_t start, ext4_lblk_t end);
2554
2555 /* ioctl.c */
2556 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2557 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2558
2559 /* migrate.c */
2560 extern int ext4_ext_migrate(struct inode *);
2561 extern int ext4_ind_migrate(struct inode *inode);
2562
2563 /* namei.c */
2564 extern int ext4_dirent_csum_verify(struct inode *inode,
2565 struct ext4_dir_entry *dirent);
2566 extern int ext4_orphan_add(handle_t *, struct inode *);
2567 extern int ext4_orphan_del(handle_t *, struct inode *);
2568 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2569 __u32 start_minor_hash, __u32 *next_hash);
2570 extern int ext4_search_dir(struct buffer_head *bh,
2571 char *search_buf,
2572 int buf_size,
2573 struct inode *dir,
2574 struct ext4_filename *fname,
2575 unsigned int offset,
2576 struct ext4_dir_entry_2 **res_dir);
2577 extern int ext4_generic_delete_entry(handle_t *handle,
2578 struct inode *dir,
2579 struct ext4_dir_entry_2 *de_del,
2580 struct buffer_head *bh,
2581 void *entry_buf,
2582 int buf_size,
2583 int csum_size);
2584 extern bool ext4_empty_dir(struct inode *inode);
2585
2586 /* resize.c */
2587 extern void ext4_kvfree_array_rcu(void *to_free);
2588 extern int ext4_group_add(struct super_block *sb,
2589 struct ext4_new_group_data *input);
2590 extern int ext4_group_extend(struct super_block *sb,
2591 struct ext4_super_block *es,
2592 ext4_fsblk_t n_blocks_count);
2593 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2594
2595 /* super.c */
2596 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2597 sector_t block, int op_flags);
2598 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2599 extern int ext4_calculate_overhead(struct super_block *sb);
2600 extern void ext4_superblock_csum_set(struct super_block *sb);
2601 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2602 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2603 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2604 ext4_group_t ngroup);
2605 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2606 char nbuf[16]);
2607 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2608 ext4_group_t block_group,
2609 unsigned int flags);
2610
2611 extern __printf(4, 5)
2612 void __ext4_error(struct super_block *, const char *, unsigned int,
2613 const char *, ...);
2614 extern __printf(5, 6)
2615 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2616 const char *, ...);
2617 extern __printf(5, 6)
2618 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2619 const char *, ...);
2620 extern void __ext4_std_error(struct super_block *, const char *,
2621 unsigned int, int);
2622 extern __printf(4, 5)
2623 void __ext4_abort(struct super_block *, const char *, unsigned int,
2624 const char *, ...);
2625 extern __printf(4, 5)
2626 void __ext4_warning(struct super_block *, const char *, unsigned int,
2627 const char *, ...);
2628 extern __printf(4, 5)
2629 void __ext4_warning_inode(const struct inode *inode, const char *function,
2630 unsigned int line, const char *fmt, ...);
2631 extern __printf(3, 4)
2632 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2633 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2634 const char *, unsigned int, const char *);
2635 extern __printf(7, 8)
2636 void __ext4_grp_locked_error(const char *, unsigned int,
2637 struct super_block *, ext4_group_t,
2638 unsigned long, ext4_fsblk_t,
2639 const char *, ...);
2640
2641 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2642 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2643
2644 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
2645 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2646
2647 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
2648 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2649
2650 #ifdef CONFIG_PRINTK
2651
2652 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2653 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2654 #define ext4_error_file(file, func, line, block, fmt, ...) \
2655 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2656 #define ext4_error(sb, fmt, ...) \
2657 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2658 #define ext4_abort(sb, fmt, ...) \
2659 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2660 #define ext4_warning(sb, fmt, ...) \
2661 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2662 #define ext4_warning_inode(inode, fmt, ...) \
2663 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2664 #define ext4_msg(sb, level, fmt, ...) \
2665 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2666 #define dump_mmp_msg(sb, mmp, msg) \
2667 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2668 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2669 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2670 fmt, ##__VA_ARGS__)
2671
2672 #else
2673
2674 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2675 do { \
2676 no_printk(fmt, ##__VA_ARGS__); \
2677 __ext4_error_inode(inode, "", 0, block, " "); \
2678 } while (0)
2679 #define ext4_error_file(file, func, line, block, fmt, ...) \
2680 do { \
2681 no_printk(fmt, ##__VA_ARGS__); \
2682 __ext4_error_file(file, "", 0, block, " "); \
2683 } while (0)
2684 #define ext4_error(sb, fmt, ...) \
2685 do { \
2686 no_printk(fmt, ##__VA_ARGS__); \
2687 __ext4_error(sb, "", 0, " "); \
2688 } while (0)
2689 #define ext4_abort(sb, fmt, ...) \
2690 do { \
2691 no_printk(fmt, ##__VA_ARGS__); \
2692 __ext4_abort(sb, "", 0, " "); \
2693 } while (0)
2694 #define ext4_warning(sb, fmt, ...) \
2695 do { \
2696 no_printk(fmt, ##__VA_ARGS__); \
2697 __ext4_warning(sb, "", 0, " "); \
2698 } while (0)
2699 #define ext4_warning_inode(inode, fmt, ...) \
2700 do { \
2701 no_printk(fmt, ##__VA_ARGS__); \
2702 __ext4_warning_inode(inode, "", 0, " "); \
2703 } while (0)
2704 #define ext4_msg(sb, level, fmt, ...) \
2705 do { \
2706 no_printk(fmt, ##__VA_ARGS__); \
2707 __ext4_msg(sb, "", " "); \
2708 } while (0)
2709 #define dump_mmp_msg(sb, mmp, msg) \
2710 __dump_mmp_msg(sb, mmp, "", 0, "")
2711 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2712 do { \
2713 no_printk(fmt, ##__VA_ARGS__); \
2714 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2715 } while (0)
2716
2717 #endif
2718
2719 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2720 __u32 compat);
2721 extern int ext4_update_rocompat_feature(handle_t *handle,
2722 struct super_block *sb, __u32 rocompat);
2723 extern int ext4_update_incompat_feature(handle_t *handle,
2724 struct super_block *sb, __u32 incompat);
2725 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2726 struct ext4_group_desc *bg);
2727 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2728 struct ext4_group_desc *bg);
2729 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2730 struct ext4_group_desc *bg);
2731 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2732 struct ext4_group_desc *bg);
2733 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2734 struct ext4_group_desc *bg);
2735 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2736 struct ext4_group_desc *bg);
2737 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2738 struct ext4_group_desc *bg);
2739 extern void ext4_block_bitmap_set(struct super_block *sb,
2740 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2741 extern void ext4_inode_bitmap_set(struct super_block *sb,
2742 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2743 extern void ext4_inode_table_set(struct super_block *sb,
2744 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2745 extern void ext4_free_group_clusters_set(struct super_block *sb,
2746 struct ext4_group_desc *bg,
2747 __u32 count);
2748 extern void ext4_free_inodes_set(struct super_block *sb,
2749 struct ext4_group_desc *bg, __u32 count);
2750 extern void ext4_used_dirs_set(struct super_block *sb,
2751 struct ext4_group_desc *bg, __u32 count);
2752 extern void ext4_itable_unused_set(struct super_block *sb,
2753 struct ext4_group_desc *bg, __u32 count);
2754 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2755 struct ext4_group_desc *gdp);
2756 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2757 struct ext4_group_desc *gdp);
2758 extern int ext4_register_li_request(struct super_block *sb,
2759 ext4_group_t first_not_zeroed);
2760
2761 static inline int ext4_has_metadata_csum(struct super_block *sb)
2762 {
2763 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2764 !EXT4_SB(sb)->s_chksum_driver);
2765
2766 return ext4_has_feature_metadata_csum(sb) &&
2767 (EXT4_SB(sb)->s_chksum_driver != NULL);
2768 }
2769
2770 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2771 {
2772 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2773 }
2774
2775 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2776 {
2777 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2778 le32_to_cpu(es->s_blocks_count_lo);
2779 }
2780
2781 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2782 {
2783 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2784 le32_to_cpu(es->s_r_blocks_count_lo);
2785 }
2786
2787 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2788 {
2789 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2790 le32_to_cpu(es->s_free_blocks_count_lo);
2791 }
2792
2793 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2794 ext4_fsblk_t blk)
2795 {
2796 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2797 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2798 }
2799
2800 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2801 ext4_fsblk_t blk)
2802 {
2803 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2804 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2805 }
2806
2807 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2808 ext4_fsblk_t blk)
2809 {
2810 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2811 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2812 }
2813
2814 static inline loff_t ext4_isize(struct super_block *sb,
2815 struct ext4_inode *raw_inode)
2816 {
2817 if (ext4_has_feature_largedir(sb) ||
2818 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2819 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2820 le32_to_cpu(raw_inode->i_size_lo);
2821
2822 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2823 }
2824
2825 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2826 {
2827 raw_inode->i_size_lo = cpu_to_le32(i_size);
2828 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2829 }
2830
2831 static inline
2832 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2833 ext4_group_t group)
2834 {
2835 struct ext4_group_info **grp_info;
2836 long indexv, indexh;
2837 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2838 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2839 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2840 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
2841 return grp_info[indexh];
2842 }
2843
2844 /*
2845 * Reading s_groups_count requires using smp_rmb() afterwards. See
2846 * the locking protocol documented in the comments of ext4_group_add()
2847 * in resize.c
2848 */
2849 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2850 {
2851 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2852
2853 smp_rmb();
2854 return ngroups;
2855 }
2856
2857 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2858 ext4_group_t block_group)
2859 {
2860 return block_group >> sbi->s_log_groups_per_flex;
2861 }
2862
2863 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2864 {
2865 return 1 << sbi->s_log_groups_per_flex;
2866 }
2867
2868 #define ext4_std_error(sb, errno) \
2869 do { \
2870 if ((errno)) \
2871 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2872 } while (0)
2873
2874 #ifdef CONFIG_SMP
2875 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2876 * counters. So we need to make sure we have free clusters more
2877 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2878 */
2879 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2880 #else
2881 #define EXT4_FREECLUSTERS_WATERMARK 0
2882 #endif
2883
2884 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2885 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2886 {
2887 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2888 !inode_is_locked(inode));
2889 down_write(&EXT4_I(inode)->i_data_sem);
2890 if (newsize > EXT4_I(inode)->i_disksize)
2891 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
2892 up_write(&EXT4_I(inode)->i_data_sem);
2893 }
2894
2895 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2896 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2897 {
2898 int changed = 0;
2899
2900 if (newsize > inode->i_size) {
2901 i_size_write(inode, newsize);
2902 changed = 1;
2903 }
2904 if (newsize > EXT4_I(inode)->i_disksize) {
2905 ext4_update_i_disksize(inode, newsize);
2906 changed |= 2;
2907 }
2908 return changed;
2909 }
2910
2911 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2912 loff_t len);
2913
2914 struct ext4_group_info {
2915 unsigned long bb_state;
2916 struct rb_root bb_free_root;
2917 ext4_grpblk_t bb_first_free; /* first free block */
2918 ext4_grpblk_t bb_free; /* total free blocks */
2919 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2920 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2921 struct list_head bb_prealloc_list;
2922 #ifdef DOUBLE_CHECK
2923 void *bb_bitmap;
2924 #endif
2925 struct rw_semaphore alloc_sem;
2926 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2927 * regions, index is order.
2928 * bb_counters[3] = 5 means
2929 * 5 free 8-block regions. */
2930 };
2931
2932 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2933 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2934 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2935 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2936 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
2937 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2938 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
2939 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2940
2941 #define EXT4_MB_GRP_NEED_INIT(grp) \
2942 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2943 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2944 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2945 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2946 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2947
2948 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2949 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2950 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2951 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2952 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2953 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2954
2955 #define EXT4_MAX_CONTENTION 8
2956 #define EXT4_CONTENTION_THRESHOLD 2
2957
2958 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2959 ext4_group_t group)
2960 {
2961 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2962 }
2963
2964 /*
2965 * Returns true if the filesystem is busy enough that attempts to
2966 * access the block group locks has run into contention.
2967 */
2968 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2969 {
2970 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2971 }
2972
2973 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2974 {
2975 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2976 if (spin_trylock(lock))
2977 /*
2978 * We're able to grab the lock right away, so drop the
2979 * lock contention counter.
2980 */
2981 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2982 else {
2983 /*
2984 * The lock is busy, so bump the contention counter,
2985 * and then wait on the spin lock.
2986 */
2987 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2988 EXT4_MAX_CONTENTION);
2989 spin_lock(lock);
2990 }
2991 }
2992
2993 static inline void ext4_unlock_group(struct super_block *sb,
2994 ext4_group_t group)
2995 {
2996 spin_unlock(ext4_group_lock_ptr(sb, group));
2997 }
2998
2999 /*
3000 * Block validity checking
3001 */
3002 #define ext4_check_indirect_blockref(inode, bh) \
3003 ext4_check_blockref(__func__, __LINE__, inode, \
3004 (__le32 *)(bh)->b_data, \
3005 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3006
3007 #define ext4_ind_check_inode(inode) \
3008 ext4_check_blockref(__func__, __LINE__, inode, \
3009 EXT4_I(inode)->i_data, \
3010 EXT4_NDIR_BLOCKS)
3011
3012 /*
3013 * Inodes and files operations
3014 */
3015
3016 /* dir.c */
3017 extern const struct file_operations ext4_dir_operations;
3018
3019 /* file.c */
3020 extern const struct inode_operations ext4_file_inode_operations;
3021 extern const struct file_operations ext4_file_operations;
3022 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3023
3024 /* inline.c */
3025 extern int ext4_get_max_inline_size(struct inode *inode);
3026 extern int ext4_find_inline_data_nolock(struct inode *inode);
3027 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3028 unsigned int len);
3029 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3030
3031 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3032 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3033 struct inode *inode,
3034 loff_t pos, unsigned len,
3035 unsigned flags,
3036 struct page **pagep);
3037 extern int ext4_write_inline_data_end(struct inode *inode,
3038 loff_t pos, unsigned len,
3039 unsigned copied,
3040 struct page *page);
3041 extern struct buffer_head *
3042 ext4_journalled_write_inline_data(struct inode *inode,
3043 unsigned len,
3044 struct page *page);
3045 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3046 struct inode *inode,
3047 loff_t pos, unsigned len,
3048 unsigned flags,
3049 struct page **pagep,
3050 void **fsdata);
3051 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3052 unsigned len, unsigned copied,
3053 struct page *page);
3054 extern int ext4_try_add_inline_entry(handle_t *handle,
3055 struct ext4_filename *fname,
3056 struct inode *dir, struct inode *inode);
3057 extern int ext4_try_create_inline_dir(handle_t *handle,
3058 struct inode *parent,
3059 struct inode *inode);
3060 extern int ext4_read_inline_dir(struct file *filp,
3061 struct dir_context *ctx,
3062 int *has_inline_data);
3063 extern int htree_inlinedir_to_tree(struct file *dir_file,
3064 struct inode *dir, ext4_lblk_t block,
3065 struct dx_hash_info *hinfo,
3066 __u32 start_hash, __u32 start_minor_hash,
3067 int *has_inline_data);
3068 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3069 struct ext4_filename *fname,
3070 struct ext4_dir_entry_2 **res_dir,
3071 int *has_inline_data);
3072 extern int ext4_delete_inline_entry(handle_t *handle,
3073 struct inode *dir,
3074 struct ext4_dir_entry_2 *de_del,
3075 struct buffer_head *bh,
3076 int *has_inline_data);
3077 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3078 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3079 struct ext4_dir_entry_2 **parent_de,
3080 int *retval);
3081 extern int ext4_inline_data_fiemap(struct inode *inode,
3082 struct fiemap_extent_info *fieinfo,
3083 int *has_inline, __u64 start, __u64 len);
3084
3085 struct iomap;
3086 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3087
3088 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3089
3090 extern int ext4_convert_inline_data(struct inode *inode);
3091
3092 static inline int ext4_has_inline_data(struct inode *inode)
3093 {
3094 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3095 EXT4_I(inode)->i_inline_off;
3096 }
3097
3098 /* namei.c */
3099 extern const struct inode_operations ext4_dir_inode_operations;
3100 extern const struct inode_operations ext4_special_inode_operations;
3101 extern struct dentry *ext4_get_parent(struct dentry *child);
3102 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3103 struct ext4_dir_entry_2 *de,
3104 int blocksize, int csum_size,
3105 unsigned int parent_ino, int dotdot_real_len);
3106 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3107 unsigned int blocksize);
3108 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3109 struct inode *inode,
3110 struct buffer_head *bh);
3111 #define S_SHIFT 12
3112 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3113 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3114 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3115 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3116 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3117 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3118 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3119 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3120 };
3121
3122 static inline void ext4_set_de_type(struct super_block *sb,
3123 struct ext4_dir_entry_2 *de,
3124 umode_t mode) {
3125 if (ext4_has_feature_filetype(sb))
3126 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3127 }
3128
3129 /* readpages.c */
3130 extern int ext4_mpage_readpages(struct address_space *mapping,
3131 struct list_head *pages, struct page *page,
3132 unsigned nr_pages, bool is_readahead);
3133
3134 /* symlink.c */
3135 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3136 extern const struct inode_operations ext4_symlink_inode_operations;
3137 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3138
3139 /* sysfs.c */
3140 extern int ext4_register_sysfs(struct super_block *sb);
3141 extern void ext4_unregister_sysfs(struct super_block *sb);
3142 extern int __init ext4_init_sysfs(void);
3143 extern void ext4_exit_sysfs(void);
3144
3145 /* block_validity */
3146 extern void ext4_release_system_zone(struct super_block *sb);
3147 extern int ext4_setup_system_zone(struct super_block *sb);
3148 extern int __init ext4_init_system_zone(void);
3149 extern void ext4_exit_system_zone(void);
3150 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3151 ext4_fsblk_t start_blk,
3152 unsigned int count);
3153 extern int ext4_check_blockref(const char *, unsigned int,
3154 struct inode *, __le32 *, unsigned int);
3155
3156 /* extents.c */
3157 struct ext4_ext_path;
3158 struct ext4_extent;
3159
3160 /*
3161 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3162 * __le32.
3163 */
3164 #define EXT_MAX_BLOCKS 0xffffffff
3165
3166 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3167 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3168 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3169 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3170 struct ext4_map_blocks *map, int flags);
3171 extern int ext4_ext_truncate(handle_t *, struct inode *);
3172 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3173 ext4_lblk_t end);
3174 extern void ext4_ext_init(struct super_block *);
3175 extern void ext4_ext_release(struct super_block *);
3176 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3177 loff_t len);
3178 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3179 loff_t offset, ssize_t len);
3180 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3181 struct ext4_map_blocks *map, int flags);
3182 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3183 ext4_lblk_t lblocks);
3184 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3185 int num,
3186 struct ext4_ext_path *path);
3187 extern int ext4_can_extents_be_merged(struct inode *inode,
3188 struct ext4_extent *ex1,
3189 struct ext4_extent *ex2);
3190 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3191 struct ext4_ext_path **,
3192 struct ext4_extent *, int);
3193 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3194 struct ext4_ext_path **,
3195 int flags);
3196 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3197 extern int ext4_ext_check_inode(struct inode *inode);
3198 extern int ext4_find_delalloc_range(struct inode *inode,
3199 ext4_lblk_t lblk_start,
3200 ext4_lblk_t lblk_end);
3201 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3202 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3203 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3204 __u64 start, __u64 len);
3205 extern int ext4_ext_precache(struct inode *inode);
3206 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3207 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3208 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3209 struct inode *inode2, ext4_lblk_t lblk1,
3210 ext4_lblk_t lblk2, ext4_lblk_t count,
3211 int mark_unwritten,int *err);
3212
3213 /* move_extent.c */
3214 extern void ext4_double_down_write_data_sem(struct inode *first,
3215 struct inode *second);
3216 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3217 struct inode *donor_inode);
3218 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3219 __u64 start_orig, __u64 start_donor,
3220 __u64 len, __u64 *moved_len);
3221
3222 /* page-io.c */
3223 extern int __init ext4_init_pageio(void);
3224 extern void ext4_exit_pageio(void);
3225 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3226 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3227 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3228 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3229 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3230 struct writeback_control *wbc);
3231 extern void ext4_end_io_rsv_work(struct work_struct *work);
3232 extern void ext4_io_submit(struct ext4_io_submit *io);
3233 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3234 struct page *page,
3235 int len,
3236 struct writeback_control *wbc,
3237 bool keep_towrite);
3238
3239 /* mmp.c */
3240 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3241
3242 /*
3243 * Add new method to test whether block and inode bitmaps are properly
3244 * initialized. With uninit_bg reading the block from disk is not enough
3245 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3246 */
3247 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3248
3249 static inline int bitmap_uptodate(struct buffer_head *bh)
3250 {
3251 return (buffer_uptodate(bh) &&
3252 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3253 }
3254 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3255 {
3256 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3257 }
3258
3259 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3260
3261 /* For ioend & aio unwritten conversion wait queues */
3262 #define EXT4_WQ_HASH_SZ 37
3263 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3264 EXT4_WQ_HASH_SZ])
3265 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3266
3267 extern int ext4_resize_begin(struct super_block *sb);
3268 extern void ext4_resize_end(struct super_block *sb);
3269
3270 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3271 struct ext4_io_end *io_end)
3272 {
3273 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3274 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3275 atomic_inc(&EXT4_I(inode)->i_unwritten);
3276 }
3277 }
3278
3279 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3280 {
3281 struct inode *inode = io_end->inode;
3282
3283 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3284 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3285 /* Wake up anyone waiting on unwritten extent conversion */
3286 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3287 wake_up_all(ext4_ioend_wq(inode));
3288 }
3289 }
3290
3291 extern const struct iomap_ops ext4_iomap_ops;
3292
3293 #endif /* __KERNEL__ */
3294
3295 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3296 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3297
3298 #endif /* _EXT4_H */
Linux with added FPC-III support