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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#include <linux/fscrypt.h>
44
45#include <linux/compiler.h>
46
47
48
49
50
51
52
53
54
55#define AGGRESSIVE_CHECK__
56
57
58
59
60
61#define DOUBLE_CHECK__
62
63
64
65
66#undef EXT4FS_DEBUG
67
68
69
70
71#ifdef EXT4FS_DEBUG
72#define ext4_debug(f, a...) \
73 do { \
74 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
75 __FILE__, __LINE__, __func__); \
76 printk(KERN_DEBUG f, ## a); \
77 } while (0)
78#else
79#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
80#endif
81
82
83
84
85#define EXT_DEBUG__
86#ifdef EXT_DEBUG
87#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
88#else
89#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
90#endif
91
92
93typedef int ext4_grpblk_t;
94
95
96typedef unsigned long long ext4_fsblk_t;
97
98
99typedef __u32 ext4_lblk_t;
100
101
102typedef unsigned int ext4_group_t;
103
104enum SHIFT_DIRECTION {
105 SHIFT_LEFT = 0,
106 SHIFT_RIGHT,
107};
108
109
110
111
112
113
114
115
116
117#define EXT4_MB_HINT_MERGE 0x0001
118
119#define EXT4_MB_HINT_RESERVED 0x0002
120
121#define EXT4_MB_HINT_METADATA 0x0004
122
123#define EXT4_MB_HINT_FIRST 0x0008
124
125#define EXT4_MB_HINT_BEST 0x0010
126
127#define EXT4_MB_HINT_DATA 0x0020
128
129#define EXT4_MB_HINT_NOPREALLOC 0x0040
130
131#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
132
133#define EXT4_MB_HINT_GOAL_ONLY 0x0100
134
135#define EXT4_MB_HINT_TRY_GOAL 0x0200
136
137#define EXT4_MB_DELALLOC_RESERVED 0x0400
138
139#define EXT4_MB_STREAM_ALLOC 0x0800
140
141#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
142
143#define EXT4_MB_USE_RESERVED 0x2000
144
145struct ext4_allocation_request {
146
147 struct inode *inode;
148
149 unsigned int len;
150
151 ext4_lblk_t logical;
152
153 ext4_lblk_t lleft;
154
155 ext4_lblk_t lright;
156
157 ext4_fsblk_t goal;
158
159 ext4_fsblk_t pleft;
160
161 ext4_fsblk_t pright;
162
163 unsigned int flags;
164};
165
166
167
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170
171
172
173#define EXT4_MAP_NEW (1 << BH_New)
174#define EXT4_MAP_MAPPED (1 << BH_Mapped)
175#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
176#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
177#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
178 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
179
180struct ext4_map_blocks {
181 ext4_fsblk_t m_pblk;
182 ext4_lblk_t m_lblk;
183 unsigned int m_len;
184 unsigned int m_flags;
185};
186
187
188
189
190#define EXT4_IO_END_UNWRITTEN 0x0001
191
192
193
194
195
196typedef struct ext4_io_end {
197 struct list_head list;
198 handle_t *handle;
199
200 struct inode *inode;
201 struct bio *bio;
202
203 unsigned int flag;
204 atomic_t count;
205 loff_t offset;
206 ssize_t size;
207} ext4_io_end_t;
208
209struct ext4_io_submit {
210 struct writeback_control *io_wbc;
211 struct bio *io_bio;
212 ext4_io_end_t *io_end;
213 sector_t io_next_block;
214};
215
216
217
218
219#define EXT4_BAD_INO 1
220#define EXT4_ROOT_INO 2
221#define EXT4_USR_QUOTA_INO 3
222#define EXT4_GRP_QUOTA_INO 4
223#define EXT4_BOOT_LOADER_INO 5
224#define EXT4_UNDEL_DIR_INO 6
225#define EXT4_RESIZE_INO 7
226#define EXT4_JOURNAL_INO 8
227
228
229#define EXT4_GOOD_OLD_FIRST_INO 11
230
231
232
233
234#define EXT4_LINK_MAX 65000
235
236
237
238
239#define EXT4_MIN_BLOCK_SIZE 1024
240#define EXT4_MAX_BLOCK_SIZE 65536
241#define EXT4_MIN_BLOCK_LOG_SIZE 10
242#define EXT4_MAX_BLOCK_LOG_SIZE 16
243#define EXT4_MAX_CLUSTER_LOG_SIZE 30
244#ifdef __KERNEL__
245# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
246#else
247# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
248#endif
249#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
250#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
251 EXT4_SB(s)->s_cluster_bits)
252#ifdef __KERNEL__
253# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
254# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
255#else
256# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
257#endif
258#ifdef __KERNEL__
259#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
260#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
261#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
262#else
263#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
264 EXT4_GOOD_OLD_INODE_SIZE : \
265 (s)->s_inode_size)
266#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
267 EXT4_GOOD_OLD_FIRST_INO : \
268 (s)->s_first_ino)
269#endif
270#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
271#define EXT4_MAX_BLOCKS(size, offset, blkbits) \
272 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
273 blkbits))
274
275
276#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
277
278#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
279
280#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
281 (sbi)->s_cluster_bits)
282
283#define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
284 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
285#define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
286 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
287
288#define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
289 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
290#define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
291 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
292
293
294
295
296struct ext4_group_desc
297{
298 __le32 bg_block_bitmap_lo;
299 __le32 bg_inode_bitmap_lo;
300 __le32 bg_inode_table_lo;
301 __le16 bg_free_blocks_count_lo;
302 __le16 bg_free_inodes_count_lo;
303 __le16 bg_used_dirs_count_lo;
304 __le16 bg_flags;
305 __le32 bg_exclude_bitmap_lo;
306 __le16 bg_block_bitmap_csum_lo;
307 __le16 bg_inode_bitmap_csum_lo;
308 __le16 bg_itable_unused_lo;
309 __le16 bg_checksum;
310 __le32 bg_block_bitmap_hi;
311 __le32 bg_inode_bitmap_hi;
312 __le32 bg_inode_table_hi;
313 __le16 bg_free_blocks_count_hi;
314 __le16 bg_free_inodes_count_hi;
315 __le16 bg_used_dirs_count_hi;
316 __le16 bg_itable_unused_hi;
317 __le32 bg_exclude_bitmap_hi;
318 __le16 bg_block_bitmap_csum_hi;
319 __le16 bg_inode_bitmap_csum_hi;
320 __u32 bg_reserved;
321};
322
323#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
324 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
325 sizeof(__le16))
326#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
327 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
328 sizeof(__le16))
329
330
331
332
333
334struct flex_groups {
335 atomic64_t free_clusters;
336 atomic_t free_inodes;
337 atomic_t used_dirs;
338};
339
340#define EXT4_BG_INODE_UNINIT 0x0001
341#define EXT4_BG_BLOCK_UNINIT 0x0002
342#define EXT4_BG_INODE_ZEROED 0x0004
343
344
345
346
347#define EXT4_MIN_DESC_SIZE 32
348#define EXT4_MIN_DESC_SIZE_64BIT 64
349#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
350#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
351#ifdef __KERNEL__
352# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
353# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
354# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
355# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
356# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
357#else
358# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
359# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
360# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
361#endif
362
363
364
365
366#define EXT4_NDIR_BLOCKS 12
367#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
368#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
369#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
370#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
371
372
373
374
375#define EXT4_SECRM_FL 0x00000001
376#define EXT4_UNRM_FL 0x00000002
377#define EXT4_COMPR_FL 0x00000004
378#define EXT4_SYNC_FL 0x00000008
379#define EXT4_IMMUTABLE_FL 0x00000010
380#define EXT4_APPEND_FL 0x00000020
381#define EXT4_NODUMP_FL 0x00000040
382#define EXT4_NOATIME_FL 0x00000080
383
384#define EXT4_DIRTY_FL 0x00000100
385#define EXT4_COMPRBLK_FL 0x00000200
386#define EXT4_NOCOMPR_FL 0x00000400
387
388#define EXT4_ENCRYPT_FL 0x00000800
389
390#define EXT4_INDEX_FL 0x00001000
391#define EXT4_IMAGIC_FL 0x00002000
392#define EXT4_JOURNAL_DATA_FL 0x00004000
393#define EXT4_NOTAIL_FL 0x00008000
394#define EXT4_DIRSYNC_FL 0x00010000
395#define EXT4_TOPDIR_FL 0x00020000
396#define EXT4_HUGE_FILE_FL 0x00040000
397#define EXT4_EXTENTS_FL 0x00080000
398#define EXT4_EA_INODE_FL 0x00200000
399#define EXT4_EOFBLOCKS_FL 0x00400000
400#define EXT4_INLINE_DATA_FL 0x10000000
401#define EXT4_PROJINHERIT_FL 0x20000000
402#define EXT4_CASEFOLD_FL 0x40000000
403#define EXT4_RESERVED_FL 0x80000000
404
405#define EXT4_FL_USER_VISIBLE 0x704BDFFF
406#define EXT4_FL_USER_MODIFIABLE 0x604BC0FF
407
408
409#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
410 EXT4_IMMUTABLE_FL | \
411 EXT4_APPEND_FL | \
412 EXT4_NODUMP_FL | \
413 EXT4_NOATIME_FL | \
414 EXT4_PROJINHERIT_FL)
415
416
417#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
418 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
419 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
420 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
421 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL)
422
423
424#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL))
425
426
427#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
428
429
430#define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
431
432
433static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
434{
435 if (S_ISDIR(mode))
436 return flags;
437 else if (S_ISREG(mode))
438 return flags & EXT4_REG_FLMASK;
439 else
440 return flags & EXT4_OTHER_FLMASK;
441}
442
443
444
445
446enum {
447 EXT4_INODE_SECRM = 0,
448 EXT4_INODE_UNRM = 1,
449 EXT4_INODE_COMPR = 2,
450 EXT4_INODE_SYNC = 3,
451 EXT4_INODE_IMMUTABLE = 4,
452 EXT4_INODE_APPEND = 5,
453 EXT4_INODE_NODUMP = 6,
454 EXT4_INODE_NOATIME = 7,
455
456 EXT4_INODE_DIRTY = 8,
457 EXT4_INODE_COMPRBLK = 9,
458 EXT4_INODE_NOCOMPR = 10,
459 EXT4_INODE_ENCRYPT = 11,
460
461 EXT4_INODE_INDEX = 12,
462 EXT4_INODE_IMAGIC = 13,
463 EXT4_INODE_JOURNAL_DATA = 14,
464 EXT4_INODE_NOTAIL = 15,
465 EXT4_INODE_DIRSYNC = 16,
466 EXT4_INODE_TOPDIR = 17,
467 EXT4_INODE_HUGE_FILE = 18,
468 EXT4_INODE_EXTENTS = 19,
469 EXT4_INODE_EA_INODE = 21,
470 EXT4_INODE_EOFBLOCKS = 22,
471 EXT4_INODE_INLINE_DATA = 28,
472 EXT4_INODE_PROJINHERIT = 29,
473 EXT4_INODE_RESERVED = 31,
474};
475
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486
487
488
489#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
490#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
491
492static inline void ext4_check_flag_values(void)
493{
494 CHECK_FLAG_VALUE(SECRM);
495 CHECK_FLAG_VALUE(UNRM);
496 CHECK_FLAG_VALUE(COMPR);
497 CHECK_FLAG_VALUE(SYNC);
498 CHECK_FLAG_VALUE(IMMUTABLE);
499 CHECK_FLAG_VALUE(APPEND);
500 CHECK_FLAG_VALUE(NODUMP);
501 CHECK_FLAG_VALUE(NOATIME);
502 CHECK_FLAG_VALUE(DIRTY);
503 CHECK_FLAG_VALUE(COMPRBLK);
504 CHECK_FLAG_VALUE(NOCOMPR);
505 CHECK_FLAG_VALUE(ENCRYPT);
506 CHECK_FLAG_VALUE(INDEX);
507 CHECK_FLAG_VALUE(IMAGIC);
508 CHECK_FLAG_VALUE(JOURNAL_DATA);
509 CHECK_FLAG_VALUE(NOTAIL);
510 CHECK_FLAG_VALUE(DIRSYNC);
511 CHECK_FLAG_VALUE(TOPDIR);
512 CHECK_FLAG_VALUE(HUGE_FILE);
513 CHECK_FLAG_VALUE(EXTENTS);
514 CHECK_FLAG_VALUE(EA_INODE);
515 CHECK_FLAG_VALUE(EOFBLOCKS);
516 CHECK_FLAG_VALUE(INLINE_DATA);
517 CHECK_FLAG_VALUE(PROJINHERIT);
518 CHECK_FLAG_VALUE(RESERVED);
519}
520
521
522struct ext4_new_group_input {
523 __u32 group;
524 __u64 block_bitmap;
525 __u64 inode_bitmap;
526 __u64 inode_table;
527 __u32 blocks_count;
528 __u16 reserved_blocks;
529 __u16 unused;
530};
531
532#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
533struct compat_ext4_new_group_input {
534 u32 group;
535 compat_u64 block_bitmap;
536 compat_u64 inode_bitmap;
537 compat_u64 inode_table;
538 u32 blocks_count;
539 u16 reserved_blocks;
540 u16 unused;
541};
542#endif
543
544
545struct ext4_new_group_data {
546 __u32 group;
547 __u64 block_bitmap;
548 __u64 inode_bitmap;
549 __u64 inode_table;
550 __u32 blocks_count;
551 __u16 reserved_blocks;
552 __u16 mdata_blocks;
553 __u32 free_clusters_count;
554};
555
556
557enum {
558 BLOCK_BITMAP = 0,
559 INODE_BITMAP,
560 INODE_TABLE,
561 GROUP_TABLE_COUNT,
562};
563
564
565
566
567
568
569#define EXT4_GET_BLOCKS_CREATE 0x0001
570
571#define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
572#define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
573 EXT4_GET_BLOCKS_CREATE)
574
575
576#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
577
578
579
580#define EXT4_GET_BLOCKS_PRE_IO 0x0008
581#define EXT4_GET_BLOCKS_CONVERT 0x0010
582#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
583 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
584
585#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
586 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
587
588
589#define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
590
591#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
592
593#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
594
595#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
596
597#define EXT4_GET_BLOCKS_ZERO 0x0200
598#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
599 EXT4_GET_BLOCKS_ZERO)
600
601
602#define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
603
604
605
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609
610
611
612
613#define EXT4_EX_NOCACHE 0x40000000
614#define EXT4_EX_FORCE_CACHE 0x20000000
615
616
617
618
619#define EXT4_FREE_BLOCKS_METADATA 0x0001
620#define EXT4_FREE_BLOCKS_FORGET 0x0002
621#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
622#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
623#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
624#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
625#define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
626
627
628
629
630#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
631#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
632#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
633#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
634#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
635#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
636#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
637#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
638#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
639#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
640#define EXT4_IOC_MIGRATE _IO('f', 9)
641
642
643#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
644#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
645#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
646#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
647#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
648#define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
649#define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
650#define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
651
652#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
653#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
654
655#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
656
657
658
659
660#define EXT4_GOING_FLAGS_DEFAULT 0x0
661#define EXT4_GOING_FLAGS_LOGFLUSH 0x1
662#define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2
663
664
665#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
666
667
668
669#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
670#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
671#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
672#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
673#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
674#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
675#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
676#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
677#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
678#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
679#endif
680
681
682#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
683
684
685#define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFF
686
687
688
689
690struct ext4_inode {
691 __le16 i_mode;
692 __le16 i_uid;
693 __le32 i_size_lo;
694 __le32 i_atime;
695 __le32 i_ctime;
696 __le32 i_mtime;
697 __le32 i_dtime;
698 __le16 i_gid;
699 __le16 i_links_count;
700 __le32 i_blocks_lo;
701 __le32 i_flags;
702 union {
703 struct {
704 __le32 l_i_version;
705 } linux1;
706 struct {
707 __u32 h_i_translator;
708 } hurd1;
709 struct {
710 __u32 m_i_reserved1;
711 } masix1;
712 } osd1;
713 __le32 i_block[EXT4_N_BLOCKS];
714 __le32 i_generation;
715 __le32 i_file_acl_lo;
716 __le32 i_size_high;
717 __le32 i_obso_faddr;
718 union {
719 struct {
720 __le16 l_i_blocks_high;
721 __le16 l_i_file_acl_high;
722 __le16 l_i_uid_high;
723 __le16 l_i_gid_high;
724 __le16 l_i_checksum_lo;
725 __le16 l_i_reserved;
726 } linux2;
727 struct {
728 __le16 h_i_reserved1;
729 __u16 h_i_mode_high;
730 __u16 h_i_uid_high;
731 __u16 h_i_gid_high;
732 __u32 h_i_author;
733 } hurd2;
734 struct {
735 __le16 h_i_reserved1;
736 __le16 m_i_file_acl_high;
737 __u32 m_i_reserved2[2];
738 } masix2;
739 } osd2;
740 __le16 i_extra_isize;
741 __le16 i_checksum_hi;
742 __le32 i_ctime_extra;
743 __le32 i_mtime_extra;
744 __le32 i_atime_extra;
745 __le32 i_crtime;
746 __le32 i_crtime_extra;
747 __le32 i_version_hi;
748 __le32 i_projid;
749};
750
751struct move_extent {
752 __u32 reserved;
753 __u32 donor_fd;
754 __u64 orig_start;
755 __u64 donor_start;
756 __u64 len;
757 __u64 moved_len;
758};
759
760#define EXT4_EPOCH_BITS 2
761#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
762#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
763
764
765
766
767
768
769
770
771
772
773
774#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
775 ((offsetof(typeof(*ext4_inode), field) + \
776 sizeof((ext4_inode)->field)) \
777 <= (EXT4_GOOD_OLD_INODE_SIZE + \
778 (einode)->i_extra_isize)) \
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
802{
803 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
804 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
805}
806
807static inline void ext4_decode_extra_time(struct timespec64 *time,
808 __le32 extra)
809{
810 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK))) {
811
812#if 1
813
814
815
816
817 u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;
818 if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)
819 extra_bits = 0;
820 time->tv_sec += extra_bits << 32;
821#else
822 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
823#endif
824 }
825 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
826}
827
828#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
829do { \
830 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
831 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
832 (raw_inode)->xtime ## _extra = \
833 ext4_encode_extra_time(&(inode)->xtime); \
834 } \
835} while (0)
836
837#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
838do { \
839 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
840 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
841 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
842 (raw_inode)->xtime ## _extra = \
843 ext4_encode_extra_time(&(einode)->xtime); \
844} while (0)
845
846#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
847do { \
848 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
849 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
850 ext4_decode_extra_time(&(inode)->xtime, \
851 raw_inode->xtime ## _extra); \
852 } \
853 else \
854 (inode)->xtime.tv_nsec = 0; \
855} while (0)
856
857
858#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
859do { \
860 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
861 (einode)->xtime.tv_sec = \
862 (signed)le32_to_cpu((raw_inode)->xtime); \
863 else \
864 (einode)->xtime.tv_sec = 0; \
865 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
866 ext4_decode_extra_time(&(einode)->xtime, \
867 raw_inode->xtime ## _extra); \
868 else \
869 (einode)->xtime.tv_nsec = 0; \
870} while (0)
871
872#define i_disk_version osd1.linux1.l_i_version
873
874#if defined(__KERNEL__) || defined(__linux__)
875#define i_reserved1 osd1.linux1.l_i_reserved1
876#define i_file_acl_high osd2.linux2.l_i_file_acl_high
877#define i_blocks_high osd2.linux2.l_i_blocks_high
878#define i_uid_low i_uid
879#define i_gid_low i_gid
880#define i_uid_high osd2.linux2.l_i_uid_high
881#define i_gid_high osd2.linux2.l_i_gid_high
882#define i_checksum_lo osd2.linux2.l_i_checksum_lo
883
884#elif defined(__GNU__)
885
886#define i_translator osd1.hurd1.h_i_translator
887#define i_uid_high osd2.hurd2.h_i_uid_high
888#define i_gid_high osd2.hurd2.h_i_gid_high
889#define i_author osd2.hurd2.h_i_author
890
891#elif defined(__masix__)
892
893#define i_reserved1 osd1.masix1.m_i_reserved1
894#define i_file_acl_high osd2.masix2.m_i_file_acl_high
895#define i_reserved2 osd2.masix2.m_i_reserved2
896
897#endif
898
899#include "extents_status.h"
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917enum {
918 I_DATA_SEM_NORMAL = 0,
919 I_DATA_SEM_OTHER,
920 I_DATA_SEM_QUOTA,
921};
922
923
924
925
926
927struct ext4_inode_info {
928 __le32 i_data[15];
929 __u32 i_dtime;
930 ext4_fsblk_t i_file_acl;
931
932
933
934
935
936
937
938
939 ext4_group_t i_block_group;
940 ext4_lblk_t i_dir_start_lookup;
941#if (BITS_PER_LONG < 64)
942 unsigned long i_state_flags;
943#endif
944 unsigned long i_flags;
945
946
947
948
949
950
951
952
953 struct rw_semaphore xattr_sem;
954
955 struct list_head i_orphan;
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972 loff_t i_disksize;
973
974
975
976
977
978
979
980
981
982
983
984 struct rw_semaphore i_data_sem;
985
986
987
988
989
990
991
992
993 struct rw_semaphore i_mmap_sem;
994 struct inode vfs_inode;
995 struct jbd2_inode *jinode;
996
997 spinlock_t i_raw_lock;
998
999
1000
1001
1002
1003 struct timespec64 i_crtime;
1004
1005
1006 struct list_head i_prealloc_list;
1007 spinlock_t i_prealloc_lock;
1008
1009
1010 struct ext4_es_tree i_es_tree;
1011 rwlock_t i_es_lock;
1012 struct list_head i_es_list;
1013 unsigned int i_es_all_nr;
1014 unsigned int i_es_shk_nr;
1015 ext4_lblk_t i_es_shrink_lblk;
1016
1017
1018
1019
1020 ext4_group_t i_last_alloc_group;
1021
1022
1023
1024 unsigned int i_reserved_data_blocks;
1025 ext4_lblk_t i_da_metadata_calc_last_lblock;
1026 int i_da_metadata_calc_len;
1027
1028
1029 struct ext4_pending_tree i_pending_tree;
1030
1031
1032 __u16 i_extra_isize;
1033
1034
1035 u16 i_inline_off;
1036 u16 i_inline_size;
1037
1038#ifdef CONFIG_QUOTA
1039
1040 qsize_t i_reserved_quota;
1041#endif
1042
1043
1044 spinlock_t i_completed_io_lock;
1045
1046
1047
1048
1049 struct list_head i_rsv_conversion_list;
1050 struct work_struct i_rsv_conversion_work;
1051 atomic_t i_unwritten;
1052
1053 spinlock_t i_block_reservation_lock;
1054
1055
1056
1057
1058
1059 tid_t i_sync_tid;
1060 tid_t i_datasync_tid;
1061
1062#ifdef CONFIG_QUOTA
1063 struct dquot *i_dquot[MAXQUOTAS];
1064#endif
1065
1066
1067 __u32 i_csum_seed;
1068
1069 kprojid_t i_projid;
1070};
1071
1072
1073
1074
1075#define EXT4_VALID_FS 0x0001
1076#define EXT4_ERROR_FS 0x0002
1077#define EXT4_ORPHAN_FS 0x0004
1078
1079
1080
1081
1082#define EXT2_FLAGS_SIGNED_HASH 0x0001
1083#define EXT2_FLAGS_UNSIGNED_HASH 0x0002
1084#define EXT2_FLAGS_TEST_FILESYS 0x0004
1085
1086
1087
1088
1089#define EXT4_MOUNT_NO_MBCACHE 0x00001
1090#define EXT4_MOUNT_GRPID 0x00004
1091#define EXT4_MOUNT_DEBUG 0x00008
1092#define EXT4_MOUNT_ERRORS_CONT 0x00010
1093#define EXT4_MOUNT_ERRORS_RO 0x00020
1094#define EXT4_MOUNT_ERRORS_PANIC 0x00040
1095#define EXT4_MOUNT_ERRORS_MASK 0x00070
1096#define EXT4_MOUNT_MINIX_DF 0x00080
1097#define EXT4_MOUNT_NOLOAD 0x00100
1098#ifdef CONFIG_FS_DAX
1099#define EXT4_MOUNT_DAX 0x00200
1100#else
1101#define EXT4_MOUNT_DAX 0
1102#endif
1103#define EXT4_MOUNT_DATA_FLAGS 0x00C00
1104#define EXT4_MOUNT_JOURNAL_DATA 0x00400
1105#define EXT4_MOUNT_ORDERED_DATA 0x00800
1106#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00
1107#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000
1108#define EXT4_MOUNT_NO_UID32 0x02000
1109#define EXT4_MOUNT_XATTR_USER 0x04000
1110#define EXT4_MOUNT_POSIX_ACL 0x08000
1111#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000
1112#define EXT4_MOUNT_BARRIER 0x20000
1113#define EXT4_MOUNT_QUOTA 0x40000
1114#define EXT4_MOUNT_USRQUOTA 0x80000
1115
1116
1117#define EXT4_MOUNT_GRPQUOTA 0x100000
1118
1119
1120#define EXT4_MOUNT_PRJQUOTA 0x200000
1121
1122#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000
1123#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000
1124#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000
1125#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000
1126#define EXT4_MOUNT_DELALLOC 0x8000000
1127#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000
1128#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000
1129#define EXT4_MOUNT_DISCARD 0x40000000
1130#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000
1131
1132
1133
1134
1135
1136
1137#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001
1138
1139#define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002
1140
1141
1142#define EXT4_MOUNT2_HURD_COMPAT 0x00000004
1143
1144
1145#define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008
1146
1147
1148#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1149 ~EXT4_MOUNT_##opt
1150#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1151 EXT4_MOUNT_##opt
1152#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1153 EXT4_MOUNT_##opt)
1154
1155#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1156 ~EXT4_MOUNT2_##opt
1157#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1158 EXT4_MOUNT2_##opt
1159#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1160 EXT4_MOUNT2_##opt)
1161
1162#define ext4_test_and_set_bit __test_and_set_bit_le
1163#define ext4_set_bit __set_bit_le
1164#define ext4_set_bit_atomic ext2_set_bit_atomic
1165#define ext4_test_and_clear_bit __test_and_clear_bit_le
1166#define ext4_clear_bit __clear_bit_le
1167#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1168#define ext4_test_bit test_bit_le
1169#define ext4_find_next_zero_bit find_next_zero_bit_le
1170#define ext4_find_next_bit find_next_bit_le
1171
1172extern void ext4_set_bits(void *bm, int cur, int len);
1173
1174
1175
1176
1177#define EXT4_DFL_MAX_MNT_COUNT 20
1178#define EXT4_DFL_CHECKINTERVAL 0
1179
1180
1181
1182
1183#define EXT4_ERRORS_CONTINUE 1
1184#define EXT4_ERRORS_RO 2
1185#define EXT4_ERRORS_PANIC 3
1186#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1187
1188
1189#define EXT4_CRC32C_CHKSUM 1
1190
1191
1192
1193
1194struct ext4_super_block {
1195 __le32 s_inodes_count;
1196 __le32 s_blocks_count_lo;
1197 __le32 s_r_blocks_count_lo;
1198 __le32 s_free_blocks_count_lo;
1199 __le32 s_free_inodes_count;
1200 __le32 s_first_data_block;
1201 __le32 s_log_block_size;
1202 __le32 s_log_cluster_size;
1203 __le32 s_blocks_per_group;
1204 __le32 s_clusters_per_group;
1205 __le32 s_inodes_per_group;
1206 __le32 s_mtime;
1207 __le32 s_wtime;
1208 __le16 s_mnt_count;
1209 __le16 s_max_mnt_count;
1210 __le16 s_magic;
1211 __le16 s_state;
1212 __le16 s_errors;
1213 __le16 s_minor_rev_level;
1214 __le32 s_lastcheck;
1215 __le32 s_checkinterval;
1216 __le32 s_creator_os;
1217 __le32 s_rev_level;
1218 __le16 s_def_resuid;
1219 __le16 s_def_resgid;
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233 __le32 s_first_ino;
1234 __le16 s_inode_size;
1235 __le16 s_block_group_nr;
1236 __le32 s_feature_compat;
1237 __le32 s_feature_incompat;
1238 __le32 s_feature_ro_compat;
1239 __u8 s_uuid[16];
1240 char s_volume_name[16];
1241 char s_last_mounted[64] __nonstring;
1242 __le32 s_algorithm_usage_bitmap;
1243
1244
1245
1246
1247 __u8 s_prealloc_blocks;
1248 __u8 s_prealloc_dir_blocks;
1249 __le16 s_reserved_gdt_blocks;
1250
1251
1252
1253 __u8 s_journal_uuid[16];
1254 __le32 s_journal_inum;
1255 __le32 s_journal_dev;
1256 __le32 s_last_orphan;
1257 __le32 s_hash_seed[4];
1258 __u8 s_def_hash_version;
1259 __u8 s_jnl_backup_type;
1260 __le16 s_desc_size;
1261 __le32 s_default_mount_opts;
1262 __le32 s_first_meta_bg;
1263 __le32 s_mkfs_time;
1264 __le32 s_jnl_blocks[17];
1265
1266 __le32 s_blocks_count_hi;
1267 __le32 s_r_blocks_count_hi;
1268 __le32 s_free_blocks_count_hi;
1269 __le16 s_min_extra_isize;
1270 __le16 s_want_extra_isize;
1271 __le32 s_flags;
1272 __le16 s_raid_stride;
1273 __le16 s_mmp_update_interval;
1274 __le64 s_mmp_block;
1275 __le32 s_raid_stripe_width;
1276 __u8 s_log_groups_per_flex;
1277 __u8 s_checksum_type;
1278 __u8 s_encryption_level;
1279 __u8 s_reserved_pad;
1280 __le64 s_kbytes_written;
1281 __le32 s_snapshot_inum;
1282 __le32 s_snapshot_id;
1283 __le64 s_snapshot_r_blocks_count;
1284
1285 __le32 s_snapshot_list;
1286
1287#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1288 __le32 s_error_count;
1289 __le32 s_first_error_time;
1290 __le32 s_first_error_ino;
1291 __le64 s_first_error_block;
1292 __u8 s_first_error_func[32] __nonstring;
1293 __le32 s_first_error_line;
1294 __le32 s_last_error_time;
1295 __le32 s_last_error_ino;
1296 __le32 s_last_error_line;
1297 __le64 s_last_error_block;
1298 __u8 s_last_error_func[32] __nonstring;
1299#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1300 __u8 s_mount_opts[64];
1301 __le32 s_usr_quota_inum;
1302 __le32 s_grp_quota_inum;
1303 __le32 s_overhead_clusters;
1304 __le32 s_backup_bgs[2];
1305 __u8 s_encrypt_algos[4];
1306 __u8 s_encrypt_pw_salt[16];
1307 __le32 s_lpf_ino;
1308 __le32 s_prj_quota_inum;
1309 __le32 s_checksum_seed;
1310 __u8 s_wtime_hi;
1311 __u8 s_mtime_hi;
1312 __u8 s_mkfs_time_hi;
1313 __u8 s_lastcheck_hi;
1314 __u8 s_first_error_time_hi;
1315 __u8 s_last_error_time_hi;
1316 __u8 s_pad[2];
1317 __le16 s_encoding;
1318 __le16 s_encoding_flags;
1319 __le32 s_reserved[95];
1320 __le32 s_checksum;
1321};
1322
1323#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1324
1325#ifdef __KERNEL__
1326
1327
1328
1329
1330#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1331#define EXT4_MF_FS_ABORTED 0x0002
1332#define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1333
1334#ifdef CONFIG_FS_ENCRYPTION
1335#define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1336 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1337#else
1338#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1339#endif
1340
1341
1342#define EXT4_MAXQUOTAS 3
1343
1344#define EXT4_ENC_UTF8_12_1 1
1345
1346
1347
1348
1349#define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1350
1351#define ext4_has_strict_mode(sbi) \
1352 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1353
1354
1355
1356
1357struct ext4_sb_info {
1358 unsigned long s_desc_size;
1359 unsigned long s_inodes_per_block;
1360 unsigned long s_blocks_per_group;
1361 unsigned long s_clusters_per_group;
1362 unsigned long s_inodes_per_group;
1363 unsigned long s_itb_per_group;
1364 unsigned long s_gdb_count;
1365 unsigned long s_desc_per_block;
1366 ext4_group_t s_groups_count;
1367 ext4_group_t s_blockfile_groups;
1368 unsigned long s_overhead;
1369 unsigned int s_cluster_ratio;
1370 unsigned int s_cluster_bits;
1371 loff_t s_bitmap_maxbytes;
1372 struct buffer_head * s_sbh;
1373 struct ext4_super_block *s_es;
1374 struct buffer_head **s_group_desc;
1375 unsigned int s_mount_opt;
1376 unsigned int s_mount_opt2;
1377 unsigned int s_mount_flags;
1378 unsigned int s_def_mount_opt;
1379 ext4_fsblk_t s_sb_block;
1380 atomic64_t s_resv_clusters;
1381 kuid_t s_resuid;
1382 kgid_t s_resgid;
1383 unsigned short s_mount_state;
1384 unsigned short s_pad;
1385 int s_addr_per_block_bits;
1386 int s_desc_per_block_bits;
1387 int s_inode_size;
1388 int s_first_ino;
1389 unsigned int s_inode_readahead_blks;
1390 unsigned int s_inode_goal;
1391 u32 s_hash_seed[4];
1392 int s_def_hash_version;
1393 int s_hash_unsigned;
1394 struct percpu_counter s_freeclusters_counter;
1395 struct percpu_counter s_freeinodes_counter;
1396 struct percpu_counter s_dirs_counter;
1397 struct percpu_counter s_dirtyclusters_counter;
1398 struct blockgroup_lock *s_blockgroup_lock;
1399 struct proc_dir_entry *s_proc;
1400 struct kobject s_kobj;
1401 struct completion s_kobj_unregister;
1402 struct super_block *s_sb;
1403#ifdef CONFIG_UNICODE
1404 struct unicode_map *s_encoding;
1405 __u16 s_encoding_flags;
1406#endif
1407
1408
1409 struct journal_s *s_journal;
1410 struct list_head s_orphan;
1411 struct mutex s_orphan_lock;
1412 unsigned long s_ext4_flags;
1413 unsigned long s_commit_interval;
1414 u32 s_max_batch_time;
1415 u32 s_min_batch_time;
1416 struct block_device *journal_bdev;
1417#ifdef CONFIG_QUOTA
1418
1419 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1420 int s_jquota_fmt;
1421#endif
1422 unsigned int s_want_extra_isize;
1423 struct rb_root system_blks;
1424
1425#ifdef EXTENTS_STATS
1426
1427 unsigned long s_ext_min;
1428 unsigned long s_ext_max;
1429 unsigned long s_depth_max;
1430 spinlock_t s_ext_stats_lock;
1431 unsigned long s_ext_blocks;
1432 unsigned long s_ext_extents;
1433#endif
1434
1435
1436 struct ext4_group_info ***s_group_info;
1437 struct inode *s_buddy_cache;
1438 spinlock_t s_md_lock;
1439 unsigned short *s_mb_offsets;
1440 unsigned int *s_mb_maxs;
1441 unsigned int s_group_info_size;
1442 unsigned int s_mb_free_pending;
1443 struct list_head s_freed_data_list;
1444
1445
1446
1447 unsigned long s_stripe;
1448 unsigned int s_mb_stream_request;
1449 unsigned int s_mb_max_to_scan;
1450 unsigned int s_mb_min_to_scan;
1451 unsigned int s_mb_stats;
1452 unsigned int s_mb_order2_reqs;
1453 unsigned int s_mb_group_prealloc;
1454 unsigned int s_max_dir_size_kb;
1455
1456 unsigned long s_mb_last_group;
1457 unsigned long s_mb_last_start;
1458
1459
1460 atomic_t s_bal_reqs;
1461 atomic_t s_bal_success;
1462 atomic_t s_bal_allocated;
1463 atomic_t s_bal_ex_scanned;
1464 atomic_t s_bal_goals;
1465 atomic_t s_bal_breaks;
1466 atomic_t s_bal_2orders;
1467 spinlock_t s_bal_lock;
1468 unsigned long s_mb_buddies_generated;
1469 unsigned long long s_mb_generation_time;
1470 atomic_t s_mb_lost_chunks;
1471 atomic_t s_mb_preallocated;
1472 atomic_t s_mb_discarded;
1473 atomic_t s_lock_busy;
1474
1475
1476 struct ext4_locality_group __percpu *s_locality_groups;
1477
1478
1479 unsigned long s_sectors_written_start;
1480 u64 s_kbytes_written;
1481
1482
1483 unsigned int s_extent_max_zeroout_kb;
1484
1485 unsigned int s_log_groups_per_flex;
1486 struct flex_groups *s_flex_groups;
1487 ext4_group_t s_flex_groups_allocated;
1488
1489
1490 struct workqueue_struct *rsv_conversion_wq;
1491
1492
1493 struct timer_list s_err_report;
1494
1495
1496 struct ext4_li_request *s_li_request;
1497
1498 unsigned int s_li_wait_mult;
1499
1500
1501 struct task_struct *s_mmp_tsk;
1502
1503
1504 atomic_t s_last_trim_minblks;
1505
1506
1507 struct crypto_shash *s_chksum_driver;
1508
1509
1510 __u32 s_csum_seed;
1511
1512
1513 struct shrinker s_es_shrinker;
1514 struct list_head s_es_list;
1515 long s_es_nr_inode;
1516 struct ext4_es_stats s_es_stats;
1517 struct mb_cache *s_ea_block_cache;
1518 struct mb_cache *s_ea_inode_cache;
1519 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1520
1521
1522 struct ratelimit_state s_err_ratelimit_state;
1523 struct ratelimit_state s_warning_ratelimit_state;
1524 struct ratelimit_state s_msg_ratelimit_state;
1525
1526
1527 struct percpu_rw_semaphore s_journal_flag_rwsem;
1528 struct dax_device *s_daxdev;
1529};
1530
1531static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1532{
1533 return sb->s_fs_info;
1534}
1535static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1536{
1537 return container_of(inode, struct ext4_inode_info, vfs_inode);
1538}
1539
1540static 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
1549
1550enum {
1551 EXT4_STATE_JDATA,
1552 EXT4_STATE_NEW,
1553 EXT4_STATE_XATTR,
1554 EXT4_STATE_NO_EXPAND,
1555 EXT4_STATE_DA_ALLOC_CLOSE,
1556 EXT4_STATE_EXT_MIGRATE,
1557 EXT4_STATE_DIO_UNWRITTEN,
1558 EXT4_STATE_NEWENTRY,
1559 EXT4_STATE_MAY_INLINE_DATA,
1560 EXT4_STATE_EXT_PRECACHED,
1561 EXT4_STATE_LUSTRE_EA_INODE,
1562};
1563
1564#define EXT4_INODE_BIT_FNS(name, field, offset) \
1565static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1566{ \
1567 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1568} \
1569static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1570{ \
1571 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1572} \
1573static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1574{ \
1575 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1576}
1577
1578
1579
1580static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1581static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1582static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1583EXT4_INODE_BIT_FNS(flag, flags, 0)
1584
1585
1586
1587static inline int ext4_test_inode_state(struct inode *inode, int bit);
1588static inline void ext4_set_inode_state(struct inode *inode, int bit);
1589static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1590#if (BITS_PER_LONG < 64)
1591EXT4_INODE_BIT_FNS(state, state_flags, 0)
1592
1593static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1594{
1595 (ei)->i_state_flags = 0;
1596}
1597#else
1598EXT4_INODE_BIT_FNS(state, flags, 32)
1599
1600static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1601{
1602
1603}
1604#endif
1605#else
1606
1607
1608
1609#define EXT4_SB(sb) (sb)
1610#endif
1611
1612#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1613
1614
1615
1616
1617#define EXT4_OS_LINUX 0
1618#define EXT4_OS_HURD 1
1619#define EXT4_OS_MASIX 2
1620#define EXT4_OS_FREEBSD 3
1621#define EXT4_OS_LITES 4
1622
1623
1624
1625
1626#define EXT4_GOOD_OLD_REV 0
1627#define EXT4_DYNAMIC_REV 1
1628
1629#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1630#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1631
1632#define EXT4_GOOD_OLD_INODE_SIZE 128
1633
1634
1635
1636
1637
1638#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1639#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1640#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1641#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1642#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1643#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1644#define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1645
1646#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1647#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1648#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1649#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1650#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1651#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1652#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1653#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1654#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1655
1656
1657
1658
1659
1660
1661#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1662#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1663#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1664
1665#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1666#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1667#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
1668#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
1669#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1670#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
1671#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1672#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1673#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1674#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
1675#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
1676#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1677#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000
1678#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000
1679#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1680#define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
1681
1682extern void ext4_update_dynamic_rev(struct super_block *sb);
1683
1684#define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1685static inline bool ext4_has_feature_##name(struct super_block *sb) \
1686{ \
1687 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1688 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1689} \
1690static inline void ext4_set_feature_##name(struct super_block *sb) \
1691{ \
1692 ext4_update_dynamic_rev(sb); \
1693 EXT4_SB(sb)->s_es->s_feature_compat |= \
1694 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1695} \
1696static inline void ext4_clear_feature_##name(struct super_block *sb) \
1697{ \
1698 EXT4_SB(sb)->s_es->s_feature_compat &= \
1699 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1700}
1701
1702#define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1703static inline bool ext4_has_feature_##name(struct super_block *sb) \
1704{ \
1705 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1706 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1707} \
1708static inline void ext4_set_feature_##name(struct super_block *sb) \
1709{ \
1710 ext4_update_dynamic_rev(sb); \
1711 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1712 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1713} \
1714static inline void ext4_clear_feature_##name(struct super_block *sb) \
1715{ \
1716 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1717 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1718}
1719
1720#define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1721static inline bool ext4_has_feature_##name(struct super_block *sb) \
1722{ \
1723 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1724 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1725} \
1726static inline void ext4_set_feature_##name(struct super_block *sb) \
1727{ \
1728 ext4_update_dynamic_rev(sb); \
1729 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1730 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1731} \
1732static inline void ext4_clear_feature_##name(struct super_block *sb) \
1733{ \
1734 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1735 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1736}
1737
1738EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
1739EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
1740EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
1741EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
1742EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
1743EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
1744EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
1745
1746EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
1747EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
1748EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
1749EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
1750EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
1751EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
1752EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
1753EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
1754EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
1755EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
1756EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
1757EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
1758
1759EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
1760EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
1761EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
1762EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
1763EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
1764EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
1765EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
1766EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
1767EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
1768EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
1769EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
1770EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
1771EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
1772EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
1773EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
1774EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
1775
1776#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1777#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1778 EXT4_FEATURE_INCOMPAT_META_BG)
1779#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1780 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1781 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1782
1783#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1784#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1785 EXT4_FEATURE_INCOMPAT_RECOVER| \
1786 EXT4_FEATURE_INCOMPAT_META_BG)
1787#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1788 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1789 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1790
1791#define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1792#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1793 EXT4_FEATURE_INCOMPAT_RECOVER| \
1794 EXT4_FEATURE_INCOMPAT_META_BG| \
1795 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1796 EXT4_FEATURE_INCOMPAT_64BIT| \
1797 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1798 EXT4_FEATURE_INCOMPAT_EA_INODE| \
1799 EXT4_FEATURE_INCOMPAT_MMP | \
1800 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1801 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1802 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1803 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1804 EXT4_FEATURE_INCOMPAT_LARGEDIR)
1805#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1806 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1807 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1808 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1809 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1810 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1811 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1812 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1813 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1814 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1815 EXT4_FEATURE_RO_COMPAT_PROJECT)
1816
1817#define EXTN_FEATURE_FUNCS(ver) \
1818static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1819{ \
1820 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1821 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1822} \
1823static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1824{ \
1825 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1826 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1827} \
1828static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1829{ \
1830 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1831 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1832}
1833
1834EXTN_FEATURE_FUNCS(2)
1835EXTN_FEATURE_FUNCS(3)
1836EXTN_FEATURE_FUNCS(4)
1837
1838static inline bool ext4_has_compat_features(struct super_block *sb)
1839{
1840 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1841}
1842static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1843{
1844 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1845}
1846static inline bool ext4_has_incompat_features(struct super_block *sb)
1847{
1848 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1849}
1850
1851
1852
1853
1854#define EXT4_FLAGS_RESIZING 0
1855#define EXT4_FLAGS_SHUTDOWN 1
1856
1857static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
1858{
1859 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
1860}
1861
1862
1863
1864
1865
1866#define EXT4_DEF_RESUID 0
1867#define EXT4_DEF_RESGID 0
1868
1869
1870
1871
1872#define EXT4_DEF_PROJID 0
1873
1874#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1875
1876
1877
1878
1879#define EXT4_DEFM_DEBUG 0x0001
1880#define EXT4_DEFM_BSDGROUPS 0x0002
1881#define EXT4_DEFM_XATTR_USER 0x0004
1882#define EXT4_DEFM_ACL 0x0008
1883#define EXT4_DEFM_UID16 0x0010
1884#define EXT4_DEFM_JMODE 0x0060
1885#define EXT4_DEFM_JMODE_DATA 0x0020
1886#define EXT4_DEFM_JMODE_ORDERED 0x0040
1887#define EXT4_DEFM_JMODE_WBACK 0x0060
1888#define EXT4_DEFM_NOBARRIER 0x0100
1889#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1890#define EXT4_DEFM_DISCARD 0x0400
1891#define EXT4_DEFM_NODELALLOC 0x0800
1892
1893
1894
1895
1896#define EXT4_DEF_MIN_BATCH_TIME 0
1897#define EXT4_DEF_MAX_BATCH_TIME 15000
1898
1899
1900
1901
1902
1903#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1904
1905
1906
1907
1908#define EXT4_NAME_LEN 255
1909
1910struct ext4_dir_entry {
1911 __le32 inode;
1912 __le16 rec_len;
1913 __le16 name_len;
1914 char name[EXT4_NAME_LEN];
1915};
1916
1917
1918
1919
1920
1921
1922
1923struct ext4_dir_entry_2 {
1924 __le32 inode;
1925 __le16 rec_len;
1926 __u8 name_len;
1927 __u8 file_type;
1928 char name[EXT4_NAME_LEN];
1929};
1930
1931
1932
1933
1934
1935struct ext4_dir_entry_tail {
1936 __le32 det_reserved_zero1;
1937 __le16 det_rec_len;
1938 __u8 det_reserved_zero2;
1939 __u8 det_reserved_ft;
1940 __le32 det_checksum;
1941};
1942
1943#define EXT4_DIRENT_TAIL(block, blocksize) \
1944 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1945 ((blocksize) - \
1946 sizeof(struct ext4_dir_entry_tail))))
1947
1948
1949
1950
1951
1952#define EXT4_FT_UNKNOWN 0
1953#define EXT4_FT_REG_FILE 1
1954#define EXT4_FT_DIR 2
1955#define EXT4_FT_CHRDEV 3
1956#define EXT4_FT_BLKDEV 4
1957#define EXT4_FT_FIFO 5
1958#define EXT4_FT_SOCK 6
1959#define EXT4_FT_SYMLINK 7
1960
1961#define EXT4_FT_MAX 8
1962
1963#define EXT4_FT_DIR_CSUM 0xDE
1964
1965
1966
1967
1968
1969
1970#define EXT4_DIR_PAD 4
1971#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1972#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1973 ~EXT4_DIR_ROUND)
1974#define EXT4_MAX_REC_LEN ((1<<16)-1)
1975
1976
1977
1978
1979
1980static inline unsigned int
1981ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1982{
1983 unsigned len = le16_to_cpu(dlen);
1984
1985#if (PAGE_SIZE >= 65536)
1986 if (len == EXT4_MAX_REC_LEN || len == 0)
1987 return blocksize;
1988 return (len & 65532) | ((len & 3) << 16);
1989#else
1990 return len;
1991#endif
1992}
1993
1994static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1995{
1996 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1997 BUG();
1998#if (PAGE_SIZE >= 65536)
1999 if (len < 65536)
2000 return cpu_to_le16(len);
2001 if (len == blocksize) {
2002 if (blocksize == 65536)
2003 return cpu_to_le16(EXT4_MAX_REC_LEN);
2004 else
2005 return cpu_to_le16(0);
2006 }
2007 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2008#else
2009 return cpu_to_le16(len);
2010#endif
2011}
2012
2013
2014
2015
2016
2017
2018#define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2019 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2020#define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2021 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2022#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2023
2024
2025
2026#define DX_HASH_LEGACY 0
2027#define DX_HASH_HALF_MD4 1
2028#define DX_HASH_TEA 2
2029#define DX_HASH_LEGACY_UNSIGNED 3
2030#define DX_HASH_HALF_MD4_UNSIGNED 4
2031#define DX_HASH_TEA_UNSIGNED 5
2032
2033static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2034 const void *address, unsigned int length)
2035{
2036 struct {
2037 struct shash_desc shash;
2038 char ctx[4];
2039 } desc;
2040
2041 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2042
2043 desc.shash.tfm = sbi->s_chksum_driver;
2044 *(u32 *)desc.ctx = crc;
2045
2046 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2047
2048 return *(u32 *)desc.ctx;
2049}
2050
2051#ifdef __KERNEL__
2052
2053
2054struct dx_hash_info
2055{
2056 u32 hash;
2057 u32 minor_hash;
2058 int hash_version;
2059 u32 *seed;
2060};
2061
2062
2063
2064#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2065#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2066
2067
2068
2069
2070
2071#define HASH_NB_ALWAYS 1
2072
2073struct ext4_filename {
2074 const struct qstr *usr_fname;
2075 struct fscrypt_str disk_name;
2076 struct dx_hash_info hinfo;
2077#ifdef CONFIG_FS_ENCRYPTION
2078 struct fscrypt_str crypto_buf;
2079#endif
2080};
2081
2082#define fname_name(p) ((p)->disk_name.name)
2083#define fname_len(p) ((p)->disk_name.len)
2084
2085
2086
2087
2088struct ext4_iloc
2089{
2090 struct buffer_head *bh;
2091 unsigned long offset;
2092 ext4_group_t block_group;
2093};
2094
2095static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2096{
2097 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2098}
2099
2100static inline bool ext4_is_quota_file(struct inode *inode)
2101{
2102 return IS_NOQUOTA(inode) &&
2103 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2104}
2105
2106
2107
2108
2109
2110
2111struct dir_private_info {
2112 struct rb_root root;
2113 struct rb_node *curr_node;
2114 struct fname *extra_fname;
2115 loff_t last_pos;
2116 __u32 curr_hash;
2117 __u32 curr_minor_hash;
2118 __u32 next_hash;
2119};
2120
2121
2122static inline ext4_fsblk_t
2123ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2124{
2125 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2126 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2127}
2128
2129
2130
2131
2132#define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2133
2134
2135#define EXT4_HTREE_LEVEL_COMPAT 2
2136#define EXT4_HTREE_LEVEL 3
2137
2138static inline int ext4_dir_htree_level(struct super_block *sb)
2139{
2140 return ext4_has_feature_largedir(sb) ?
2141 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2142}
2143
2144
2145
2146
2147#define EXT4_DEF_LI_WAIT_MULT 10
2148#define EXT4_DEF_LI_MAX_START_DELAY 5
2149#define EXT4_LAZYINIT_QUIT 0x0001
2150#define EXT4_LAZYINIT_RUNNING 0x0002
2151
2152
2153
2154
2155struct ext4_lazy_init {
2156 unsigned long li_state;
2157 struct list_head li_request_list;
2158 struct mutex li_list_mtx;
2159};
2160
2161struct ext4_li_request {
2162 struct super_block *lr_super;
2163 struct ext4_sb_info *lr_sbi;
2164 ext4_group_t lr_next_group;
2165 struct list_head lr_request;
2166 unsigned long lr_next_sched;
2167 unsigned long lr_timeout;
2168};
2169
2170struct ext4_features {
2171 struct kobject f_kobj;
2172 struct completion f_kobj_unregister;
2173};
2174
2175
2176
2177
2178
2179
2180
2181
2182#define EXT4_MMP_MAGIC 0x004D4D50U
2183#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U
2184#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U
2185#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU
2186
2187struct mmp_struct {
2188 __le32 mmp_magic;
2189 __le32 mmp_seq;
2190
2191
2192
2193
2194
2195 __le64 mmp_time;
2196 char mmp_nodename[64];
2197 char mmp_bdevname[32];
2198
2199
2200
2201
2202
2203
2204 __le16 mmp_check_interval;
2205
2206 __le16 mmp_pad1;
2207 __le32 mmp_pad2[226];
2208 __le32 mmp_checksum;
2209};
2210
2211
2212struct mmpd_data {
2213 struct buffer_head *bh;
2214 struct super_block *sb;
2215};
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225#define EXT4_MMP_CHECK_MULT 2UL
2226
2227
2228
2229
2230#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2231
2232
2233
2234
2235#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245# define NORET_TYPE
2246# define ATTRIB_NORET __attribute__((noreturn))
2247# define NORET_AND noreturn,
2248
2249
2250extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2251void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2252 struct ext4_group_desc *gdp,
2253 struct buffer_head *bh, int sz);
2254int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2255 struct ext4_group_desc *gdp,
2256 struct buffer_head *bh, int sz);
2257void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2258 struct ext4_group_desc *gdp,
2259 struct buffer_head *bh);
2260int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2261 struct ext4_group_desc *gdp,
2262 struct buffer_head *bh);
2263
2264
2265extern void ext4_get_group_no_and_offset(struct super_block *sb,
2266 ext4_fsblk_t blocknr,
2267 ext4_group_t *blockgrpp,
2268 ext4_grpblk_t *offsetp);
2269extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2270 ext4_fsblk_t block);
2271
2272extern unsigned int ext4_block_group(struct super_block *sb,
2273 ext4_fsblk_t blocknr);
2274extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2275 ext4_fsblk_t blocknr);
2276extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2277extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2278 ext4_group_t group);
2279extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2280 ext4_fsblk_t goal,
2281 unsigned int flags,
2282 unsigned long *count,
2283 int *errp);
2284extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2285 s64 nclusters, unsigned int flags);
2286extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2287extern void ext4_check_blocks_bitmap(struct super_block *);
2288extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2289 ext4_group_t block_group,
2290 struct buffer_head ** bh);
2291extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2292
2293extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2294 ext4_group_t block_group);
2295extern int ext4_wait_block_bitmap(struct super_block *sb,
2296 ext4_group_t block_group,
2297 struct buffer_head *bh);
2298extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2299 ext4_group_t block_group);
2300extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2301 ext4_group_t block_group,
2302 struct ext4_group_desc *gdp);
2303ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2304
2305#ifdef CONFIG_FS_ENCRYPTION
2306static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2307 const struct fscrypt_name *src)
2308{
2309 memset(dst, 0, sizeof(*dst));
2310
2311 dst->usr_fname = src->usr_fname;
2312 dst->disk_name = src->disk_name;
2313 dst->hinfo.hash = src->hash;
2314 dst->hinfo.minor_hash = src->minor_hash;
2315 dst->crypto_buf = src->crypto_buf;
2316}
2317
2318static inline int ext4_fname_setup_filename(struct inode *dir,
2319 const struct qstr *iname,
2320 int lookup,
2321 struct ext4_filename *fname)
2322{
2323 struct fscrypt_name name;
2324 int err;
2325
2326 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2327 if (err)
2328 return err;
2329
2330 ext4_fname_from_fscrypt_name(fname, &name);
2331 return 0;
2332}
2333
2334static inline int ext4_fname_prepare_lookup(struct inode *dir,
2335 struct dentry *dentry,
2336 struct ext4_filename *fname)
2337{
2338 struct fscrypt_name name;
2339 int err;
2340
2341 err = fscrypt_prepare_lookup(dir, dentry, &name);
2342 if (err)
2343 return err;
2344
2345 ext4_fname_from_fscrypt_name(fname, &name);
2346 return 0;
2347}
2348
2349static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2350{
2351 struct fscrypt_name name;
2352
2353 name.crypto_buf = fname->crypto_buf;
2354 fscrypt_free_filename(&name);
2355
2356 fname->crypto_buf.name = NULL;
2357 fname->usr_fname = NULL;
2358 fname->disk_name.name = NULL;
2359}
2360#else
2361static inline int ext4_fname_setup_filename(struct inode *dir,
2362 const struct qstr *iname,
2363 int lookup,
2364 struct ext4_filename *fname)
2365{
2366 fname->usr_fname = iname;
2367 fname->disk_name.name = (unsigned char *) iname->name;
2368 fname->disk_name.len = iname->len;
2369 return 0;
2370}
2371
2372static inline int ext4_fname_prepare_lookup(struct inode *dir,
2373 struct dentry *dentry,
2374 struct ext4_filename *fname)
2375{
2376 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2377}
2378
2379static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2380#endif
2381
2382
2383extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2384 struct file *,
2385 struct ext4_dir_entry_2 *,
2386 struct buffer_head *, char *, int,
2387 unsigned int);
2388#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2389 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2390 (de), (bh), (buf), (size), (offset)))
2391extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2392 __u32 minor_hash,
2393 struct ext4_dir_entry_2 *dirent,
2394 struct fscrypt_str *ent_name);
2395extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2396extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2397 struct buffer_head *bh,
2398 void *buf, int buf_size,
2399 struct ext4_filename *fname,
2400 struct ext4_dir_entry_2 **dest_de);
2401void ext4_insert_dentry(struct inode *inode,
2402 struct ext4_dir_entry_2 *de,
2403 int buf_size,
2404 struct ext4_filename *fname);
2405static inline void ext4_update_dx_flag(struct inode *inode)
2406{
2407 if (!ext4_has_feature_dir_index(inode->i_sb))
2408 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2409}
2410static const unsigned char ext4_filetype_table[] = {
2411 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2412};
2413
2414static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2415{
2416 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2417 return DT_UNKNOWN;
2418
2419 return ext4_filetype_table[filetype];
2420}
2421extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2422 void *buf, int buf_size);
2423
2424
2425extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2426
2427
2428extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2429 struct dx_hash_info *hinfo);
2430
2431
2432extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2433 const struct qstr *qstr, __u32 goal,
2434 uid_t *owner, __u32 i_flags,
2435 int handle_type, unsigned int line_no,
2436 int nblocks);
2437
2438#define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2439 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2440 i_flags, 0, 0, 0)
2441#define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2442 type, nblocks) \
2443 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2444 0, (type), __LINE__, (nblocks))
2445
2446
2447extern void ext4_free_inode(handle_t *, struct inode *);
2448extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2449extern unsigned long ext4_count_free_inodes(struct super_block *);
2450extern unsigned long ext4_count_dirs(struct super_block *);
2451extern void ext4_check_inodes_bitmap(struct super_block *);
2452extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2453extern int ext4_init_inode_table(struct super_block *sb,
2454 ext4_group_t group, int barrier);
2455extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2456
2457
2458extern const struct seq_operations ext4_mb_seq_groups_ops;
2459extern long ext4_mb_stats;
2460extern long ext4_mb_max_to_scan;
2461extern int ext4_mb_init(struct super_block *);
2462extern int ext4_mb_release(struct super_block *);
2463extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2464 struct ext4_allocation_request *, int *);
2465extern int ext4_mb_reserve_blocks(struct super_block *, int);
2466extern void ext4_discard_preallocations(struct inode *);
2467extern int __init ext4_init_mballoc(void);
2468extern void ext4_exit_mballoc(void);
2469extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2470 struct buffer_head *bh, ext4_fsblk_t block,
2471 unsigned long count, int flags);
2472extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2473 ext4_group_t ngroups);
2474extern int ext4_mb_add_groupinfo(struct super_block *sb,
2475 ext4_group_t i, struct ext4_group_desc *desc);
2476extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2477 ext4_fsblk_t block, unsigned long count);
2478extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2479extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2480
2481
2482int ext4_inode_is_fast_symlink(struct inode *inode);
2483struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2484struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2485int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2486 bool wait, struct buffer_head **bhs);
2487int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2488 struct buffer_head *bh_result, int create);
2489int ext4_get_block(struct inode *inode, sector_t iblock,
2490 struct buffer_head *bh_result, int create);
2491int ext4_dio_get_block(struct inode *inode, sector_t iblock,
2492 struct buffer_head *bh_result, int create);
2493int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2494 struct buffer_head *bh, int create);
2495int ext4_walk_page_buffers(handle_t *handle,
2496 struct buffer_head *head,
2497 unsigned from,
2498 unsigned to,
2499 int *partial,
2500 int (*fn)(handle_t *handle,
2501 struct buffer_head *bh));
2502int do_journal_get_write_access(handle_t *handle,
2503 struct buffer_head *bh);
2504#define FALL_BACK_TO_NONDELALLOC 1
2505#define CONVERT_INLINE_DATA 2
2506
2507typedef enum {
2508 EXT4_IGET_NORMAL = 0,
2509 EXT4_IGET_SPECIAL = 0x0001,
2510 EXT4_IGET_HANDLE = 0x0002
2511} ext4_iget_flags;
2512
2513extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2514 ext4_iget_flags flags, const char *function,
2515 unsigned int line);
2516
2517#define ext4_iget(sb, ino, flags) \
2518 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2519
2520extern int ext4_write_inode(struct inode *, struct writeback_control *);
2521extern int ext4_setattr(struct dentry *, struct iattr *);
2522extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2523extern void ext4_evict_inode(struct inode *);
2524extern void ext4_clear_inode(struct inode *);
2525extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2526extern int ext4_sync_inode(handle_t *, struct inode *);
2527extern void ext4_dirty_inode(struct inode *, int);
2528extern int ext4_change_inode_journal_flag(struct inode *, int);
2529extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2530extern int ext4_inode_attach_jinode(struct inode *inode);
2531extern int ext4_can_truncate(struct inode *inode);
2532extern int ext4_truncate(struct inode *);
2533extern int ext4_break_layouts(struct inode *);
2534extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2535extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2536extern void ext4_set_inode_flags(struct inode *);
2537extern int ext4_alloc_da_blocks(struct inode *inode);
2538extern void ext4_set_aops(struct inode *inode);
2539extern int ext4_writepage_trans_blocks(struct inode *);
2540extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2541extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2542 loff_t lstart, loff_t lend);
2543extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2544extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2545extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2546extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2547extern void ext4_da_release_space(struct inode *inode, int to_free);
2548extern void ext4_da_update_reserve_space(struct inode *inode,
2549 int used, int quota_claim);
2550extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2551 ext4_fsblk_t pblk, ext4_lblk_t len);
2552
2553
2554extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2555 struct ext4_map_blocks *map, int flags);
2556extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2557extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2558extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2559extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2560 ext4_lblk_t start, ext4_lblk_t end);
2561
2562
2563extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2564extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2565
2566
2567extern int ext4_ext_migrate(struct inode *);
2568extern int ext4_ind_migrate(struct inode *inode);
2569
2570
2571extern int ext4_dirent_csum_verify(struct inode *inode,
2572 struct ext4_dir_entry *dirent);
2573extern int ext4_orphan_add(handle_t *, struct inode *);
2574extern int ext4_orphan_del(handle_t *, struct inode *);
2575extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2576 __u32 start_minor_hash, __u32 *next_hash);
2577extern int ext4_search_dir(struct buffer_head *bh,
2578 char *search_buf,
2579 int buf_size,
2580 struct inode *dir,
2581 struct ext4_filename *fname,
2582 unsigned int offset,
2583 struct ext4_dir_entry_2 **res_dir);
2584extern int ext4_generic_delete_entry(handle_t *handle,
2585 struct inode *dir,
2586 struct ext4_dir_entry_2 *de_del,
2587 struct buffer_head *bh,
2588 void *entry_buf,
2589 int buf_size,
2590 int csum_size);
2591extern bool ext4_empty_dir(struct inode *inode);
2592
2593
2594extern int ext4_group_add(struct super_block *sb,
2595 struct ext4_new_group_data *input);
2596extern int ext4_group_extend(struct super_block *sb,
2597 struct ext4_super_block *es,
2598 ext4_fsblk_t n_blocks_count);
2599extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2600
2601
2602extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2603 sector_t block, int op_flags);
2604extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2605extern int ext4_calculate_overhead(struct super_block *sb);
2606extern void ext4_superblock_csum_set(struct super_block *sb);
2607extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2608extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2609extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2610 ext4_group_t ngroup);
2611extern const char *ext4_decode_error(struct super_block *sb, int errno,
2612 char nbuf[16]);
2613extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2614 ext4_group_t block_group,
2615 unsigned int flags);
2616
2617extern __printf(4, 5)
2618void __ext4_error(struct super_block *, const char *, unsigned int,
2619 const char *, ...);
2620extern __printf(5, 6)
2621void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2622 const char *, ...);
2623extern __printf(5, 6)
2624void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2625 const char *, ...);
2626extern void __ext4_std_error(struct super_block *, const char *,
2627 unsigned int, int);
2628extern __printf(4, 5)
2629void __ext4_abort(struct super_block *, const char *, unsigned int,
2630 const char *, ...);
2631extern __printf(4, 5)
2632void __ext4_warning(struct super_block *, const char *, unsigned int,
2633 const char *, ...);
2634extern __printf(4, 5)
2635void __ext4_warning_inode(const struct inode *inode, const char *function,
2636 unsigned int line, const char *fmt, ...);
2637extern __printf(3, 4)
2638void __ext4_msg(struct super_block *, const char *, const char *, ...);
2639extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2640 const char *, unsigned int, const char *);
2641extern __printf(7, 8)
2642void __ext4_grp_locked_error(const char *, unsigned int,
2643 struct super_block *, ext4_group_t,
2644 unsigned long, ext4_fsblk_t,
2645 const char *, ...);
2646
2647#define EXT4_ERROR_INODE(inode, fmt, a...) \
2648 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2649
2650#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
2651 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2652
2653#define EXT4_ERROR_FILE(file, block, fmt, a...) \
2654 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2655
2656#ifdef CONFIG_PRINTK
2657
2658#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2659 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2660#define ext4_error_file(file, func, line, block, fmt, ...) \
2661 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2662#define ext4_error(sb, fmt, ...) \
2663 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2664#define ext4_abort(sb, fmt, ...) \
2665 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2666#define ext4_warning(sb, fmt, ...) \
2667 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2668#define ext4_warning_inode(inode, fmt, ...) \
2669 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2670#define ext4_msg(sb, level, fmt, ...) \
2671 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2672#define dump_mmp_msg(sb, mmp, msg) \
2673 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2674#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2675 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2676 fmt, ##__VA_ARGS__)
2677
2678#else
2679
2680#define ext4_error_inode(inode, func, line, block, fmt, ...) \
2681do { \
2682 no_printk(fmt, ##__VA_ARGS__); \
2683 __ext4_error_inode(inode, "", 0, block, " "); \
2684} while (0)
2685#define ext4_error_file(file, func, line, block, fmt, ...) \
2686do { \
2687 no_printk(fmt, ##__VA_ARGS__); \
2688 __ext4_error_file(file, "", 0, block, " "); \
2689} while (0)
2690#define ext4_error(sb, fmt, ...) \
2691do { \
2692 no_printk(fmt, ##__VA_ARGS__); \
2693 __ext4_error(sb, "", 0, " "); \
2694} while (0)
2695#define ext4_abort(sb, fmt, ...) \
2696do { \
2697 no_printk(fmt, ##__VA_ARGS__); \
2698 __ext4_abort(sb, "", 0, " "); \
2699} while (0)
2700#define ext4_warning(sb, fmt, ...) \
2701do { \
2702 no_printk(fmt, ##__VA_ARGS__); \
2703 __ext4_warning(sb, "", 0, " "); \
2704} while (0)
2705#define ext4_warning_inode(inode, fmt, ...) \
2706do { \
2707 no_printk(fmt, ##__VA_ARGS__); \
2708 __ext4_warning_inode(inode, "", 0, " "); \
2709} while (0)
2710#define ext4_msg(sb, level, fmt, ...) \
2711do { \
2712 no_printk(fmt, ##__VA_ARGS__); \
2713 __ext4_msg(sb, "", " "); \
2714} while (0)
2715#define dump_mmp_msg(sb, mmp, msg) \
2716 __dump_mmp_msg(sb, mmp, "", 0, "")
2717#define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2718do { \
2719 no_printk(fmt, ##__VA_ARGS__); \
2720 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2721} while (0)
2722
2723#endif
2724
2725extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2726 __u32 compat);
2727extern int ext4_update_rocompat_feature(handle_t *handle,
2728 struct super_block *sb, __u32 rocompat);
2729extern int ext4_update_incompat_feature(handle_t *handle,
2730 struct super_block *sb, __u32 incompat);
2731extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2732 struct ext4_group_desc *bg);
2733extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2734 struct ext4_group_desc *bg);
2735extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2736 struct ext4_group_desc *bg);
2737extern __u32 ext4_free_group_clusters(struct super_block *sb,
2738 struct ext4_group_desc *bg);
2739extern __u32 ext4_free_inodes_count(struct super_block *sb,
2740 struct ext4_group_desc *bg);
2741extern __u32 ext4_used_dirs_count(struct super_block *sb,
2742 struct ext4_group_desc *bg);
2743extern __u32 ext4_itable_unused_count(struct super_block *sb,
2744 struct ext4_group_desc *bg);
2745extern void ext4_block_bitmap_set(struct super_block *sb,
2746 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2747extern void ext4_inode_bitmap_set(struct super_block *sb,
2748 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2749extern void ext4_inode_table_set(struct super_block *sb,
2750 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2751extern void ext4_free_group_clusters_set(struct super_block *sb,
2752 struct ext4_group_desc *bg,
2753 __u32 count);
2754extern void ext4_free_inodes_set(struct super_block *sb,
2755 struct ext4_group_desc *bg, __u32 count);
2756extern void ext4_used_dirs_set(struct super_block *sb,
2757 struct ext4_group_desc *bg, __u32 count);
2758extern void ext4_itable_unused_set(struct super_block *sb,
2759 struct ext4_group_desc *bg, __u32 count);
2760extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2761 struct ext4_group_desc *gdp);
2762extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2763 struct ext4_group_desc *gdp);
2764extern int ext4_register_li_request(struct super_block *sb,
2765 ext4_group_t first_not_zeroed);
2766
2767static inline int ext4_has_metadata_csum(struct super_block *sb)
2768{
2769 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2770 !EXT4_SB(sb)->s_chksum_driver);
2771
2772 return ext4_has_feature_metadata_csum(sb) &&
2773 (EXT4_SB(sb)->s_chksum_driver != NULL);
2774}
2775
2776static inline int ext4_has_group_desc_csum(struct super_block *sb)
2777{
2778 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
2779}
2780
2781static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2782{
2783 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2784 le32_to_cpu(es->s_blocks_count_lo);
2785}
2786
2787static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2788{
2789 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2790 le32_to_cpu(es->s_r_blocks_count_lo);
2791}
2792
2793static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2794{
2795 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2796 le32_to_cpu(es->s_free_blocks_count_lo);
2797}
2798
2799static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2800 ext4_fsblk_t blk)
2801{
2802 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2803 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2804}
2805
2806static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2807 ext4_fsblk_t blk)
2808{
2809 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2810 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2811}
2812
2813static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2814 ext4_fsblk_t blk)
2815{
2816 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2817 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2818}
2819
2820static inline loff_t ext4_isize(struct super_block *sb,
2821 struct ext4_inode *raw_inode)
2822{
2823 if (ext4_has_feature_largedir(sb) ||
2824 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2825 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2826 le32_to_cpu(raw_inode->i_size_lo);
2827
2828 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2829}
2830
2831static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2832{
2833 raw_inode->i_size_lo = cpu_to_le32(i_size);
2834 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2835}
2836
2837static inline
2838struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2839 ext4_group_t group)
2840{
2841 struct ext4_group_info ***grp_info;
2842 long indexv, indexh;
2843 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2844 grp_info = EXT4_SB(sb)->s_group_info;
2845 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2846 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2847 return grp_info[indexv][indexh];
2848}
2849
2850
2851
2852
2853
2854
2855static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2856{
2857 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2858
2859 smp_rmb();
2860 return ngroups;
2861}
2862
2863static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2864 ext4_group_t block_group)
2865{
2866 return block_group >> sbi->s_log_groups_per_flex;
2867}
2868
2869static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2870{
2871 return 1 << sbi->s_log_groups_per_flex;
2872}
2873
2874#define ext4_std_error(sb, errno) \
2875do { \
2876 if ((errno)) \
2877 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2878} while (0)
2879
2880#ifdef CONFIG_SMP
2881
2882
2883
2884
2885#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2886#else
2887#define EXT4_FREECLUSTERS_WATERMARK 0
2888#endif
2889
2890
2891static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2892{
2893 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2894 !inode_is_locked(inode));
2895 down_write(&EXT4_I(inode)->i_data_sem);
2896 if (newsize > EXT4_I(inode)->i_disksize)
2897 EXT4_I(inode)->i_disksize = newsize;
2898 up_write(&EXT4_I(inode)->i_data_sem);
2899}
2900
2901
2902static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2903{
2904 int changed = 0;
2905
2906 if (newsize > inode->i_size) {
2907 i_size_write(inode, newsize);
2908 changed = 1;
2909 }
2910 if (newsize > EXT4_I(inode)->i_disksize) {
2911 ext4_update_i_disksize(inode, newsize);
2912 changed |= 2;
2913 }
2914 return changed;
2915}
2916
2917int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
2918 loff_t len);
2919
2920struct ext4_group_info {
2921 unsigned long bb_state;
2922 struct rb_root bb_free_root;
2923 ext4_grpblk_t bb_first_free;
2924 ext4_grpblk_t bb_free;
2925 ext4_grpblk_t bb_fragments;
2926 ext4_grpblk_t bb_largest_free_order;
2927 struct list_head bb_prealloc_list;
2928#ifdef DOUBLE_CHECK
2929 void *bb_bitmap;
2930#endif
2931 struct rw_semaphore alloc_sem;
2932 ext4_grpblk_t bb_counters[];
2933
2934
2935
2936};
2937
2938#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2939#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2940#define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2941#define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2942#define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
2943 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
2944#define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
2945 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
2946
2947#define EXT4_MB_GRP_NEED_INIT(grp) \
2948 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2949#define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2950 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2951#define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2952 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2953
2954#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2955 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2956#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2957 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2958#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2959 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2960
2961#define EXT4_MAX_CONTENTION 8
2962#define EXT4_CONTENTION_THRESHOLD 2
2963
2964static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2965 ext4_group_t group)
2966{
2967 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2968}
2969
2970
2971
2972
2973
2974static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2975{
2976 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2977}
2978
2979static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2980{
2981 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2982 if (spin_trylock(lock))
2983
2984
2985
2986
2987 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2988 else {
2989
2990
2991
2992
2993 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2994 EXT4_MAX_CONTENTION);
2995 spin_lock(lock);
2996 }
2997}
2998
2999static inline void ext4_unlock_group(struct super_block *sb,
3000 ext4_group_t group)
3001{
3002 spin_unlock(ext4_group_lock_ptr(sb, group));
3003}
3004
3005
3006
3007
3008#define ext4_check_indirect_blockref(inode, bh) \
3009 ext4_check_blockref(__func__, __LINE__, inode, \
3010 (__le32 *)(bh)->b_data, \
3011 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3012
3013#define ext4_ind_check_inode(inode) \
3014 ext4_check_blockref(__func__, __LINE__, inode, \
3015 EXT4_I(inode)->i_data, \
3016 EXT4_NDIR_BLOCKS)
3017
3018
3019
3020
3021
3022
3023extern const struct file_operations ext4_dir_operations;
3024
3025#ifdef CONFIG_UNICODE
3026extern const struct dentry_operations ext4_dentry_ops;
3027#endif
3028
3029
3030extern const struct inode_operations ext4_file_inode_operations;
3031extern const struct file_operations ext4_file_operations;
3032extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3033
3034
3035extern int ext4_get_max_inline_size(struct inode *inode);
3036extern int ext4_find_inline_data_nolock(struct inode *inode);
3037extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3038 unsigned int len);
3039extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3040
3041extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3042extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3043 struct inode *inode,
3044 loff_t pos, unsigned len,
3045 unsigned flags,
3046 struct page **pagep);
3047extern int ext4_write_inline_data_end(struct inode *inode,
3048 loff_t pos, unsigned len,
3049 unsigned copied,
3050 struct page *page);
3051extern struct buffer_head *
3052ext4_journalled_write_inline_data(struct inode *inode,
3053 unsigned len,
3054 struct page *page);
3055extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3056 struct inode *inode,
3057 loff_t pos, unsigned len,
3058 unsigned flags,
3059 struct page **pagep,
3060 void **fsdata);
3061extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3062 unsigned len, unsigned copied,
3063 struct page *page);
3064extern int ext4_try_add_inline_entry(handle_t *handle,
3065 struct ext4_filename *fname,
3066 struct inode *dir, struct inode *inode);
3067extern int ext4_try_create_inline_dir(handle_t *handle,
3068 struct inode *parent,
3069 struct inode *inode);
3070extern int ext4_read_inline_dir(struct file *filp,
3071 struct dir_context *ctx,
3072 int *has_inline_data);
3073extern int htree_inlinedir_to_tree(struct file *dir_file,
3074 struct inode *dir, ext4_lblk_t block,
3075 struct dx_hash_info *hinfo,
3076 __u32 start_hash, __u32 start_minor_hash,
3077 int *has_inline_data);
3078extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3079 struct ext4_filename *fname,
3080 struct ext4_dir_entry_2 **res_dir,
3081 int *has_inline_data);
3082extern int ext4_delete_inline_entry(handle_t *handle,
3083 struct inode *dir,
3084 struct ext4_dir_entry_2 *de_del,
3085 struct buffer_head *bh,
3086 int *has_inline_data);
3087extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3088extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3089 struct ext4_dir_entry_2 **parent_de,
3090 int *retval);
3091extern int ext4_inline_data_fiemap(struct inode *inode,
3092 struct fiemap_extent_info *fieinfo,
3093 int *has_inline, __u64 start, __u64 len);
3094
3095struct iomap;
3096extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3097
3098extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3099
3100extern int ext4_convert_inline_data(struct inode *inode);
3101
3102static inline int ext4_has_inline_data(struct inode *inode)
3103{
3104 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3105 EXT4_I(inode)->i_inline_off;
3106}
3107
3108
3109extern const struct inode_operations ext4_dir_inode_operations;
3110extern const struct inode_operations ext4_special_inode_operations;
3111extern struct dentry *ext4_get_parent(struct dentry *child);
3112extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3113 struct ext4_dir_entry_2 *de,
3114 int blocksize, int csum_size,
3115 unsigned int parent_ino, int dotdot_real_len);
3116extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3117 unsigned int blocksize);
3118extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3119 struct inode *inode,
3120 struct buffer_head *bh);
3121extern int ext4_ci_compare(const struct inode *parent,
3122 const struct qstr *name,
3123 const struct qstr *entry);
3124
3125#define S_SHIFT 12
3126static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3127 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3128 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3129 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3130 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3131 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3132 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3133 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3134};
3135
3136static inline void ext4_set_de_type(struct super_block *sb,
3137 struct ext4_dir_entry_2 *de,
3138 umode_t mode) {
3139 if (ext4_has_feature_filetype(sb))
3140 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3141}
3142
3143
3144extern int ext4_mpage_readpages(struct address_space *mapping,
3145 struct list_head *pages, struct page *page,
3146 unsigned nr_pages, bool is_readahead);
3147
3148
3149extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3150extern const struct inode_operations ext4_symlink_inode_operations;
3151extern const struct inode_operations ext4_fast_symlink_inode_operations;
3152
3153
3154extern int ext4_register_sysfs(struct super_block *sb);
3155extern void ext4_unregister_sysfs(struct super_block *sb);
3156extern int __init ext4_init_sysfs(void);
3157extern void ext4_exit_sysfs(void);
3158
3159
3160extern void ext4_release_system_zone(struct super_block *sb);
3161extern int ext4_setup_system_zone(struct super_block *sb);
3162extern int __init ext4_init_system_zone(void);
3163extern void ext4_exit_system_zone(void);
3164extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3165 ext4_fsblk_t start_blk,
3166 unsigned int count);
3167extern int ext4_check_blockref(const char *, unsigned int,
3168 struct inode *, __le32 *, unsigned int);
3169
3170
3171struct ext4_ext_path;
3172struct ext4_extent;
3173
3174
3175
3176
3177
3178#define EXT_MAX_BLOCKS 0xffffffff
3179
3180extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3181extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3182extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3183extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3184 struct ext4_map_blocks *map, int flags);
3185extern int ext4_ext_truncate(handle_t *, struct inode *);
3186extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3187 ext4_lblk_t end);
3188extern void ext4_ext_init(struct super_block *);
3189extern void ext4_ext_release(struct super_block *);
3190extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3191 loff_t len);
3192extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3193 loff_t offset, ssize_t len);
3194extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3195 struct ext4_map_blocks *map, int flags);
3196extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3197 ext4_lblk_t lblocks);
3198extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3199 int num,
3200 struct ext4_ext_path *path);
3201extern int ext4_can_extents_be_merged(struct inode *inode,
3202 struct ext4_extent *ex1,
3203 struct ext4_extent *ex2);
3204extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3205 struct ext4_ext_path **,
3206 struct ext4_extent *, int);
3207extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3208 struct ext4_ext_path **,
3209 int flags);
3210extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3211extern int ext4_ext_check_inode(struct inode *inode);
3212extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3213extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3214 __u64 start, __u64 len);
3215extern int ext4_ext_precache(struct inode *inode);
3216extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3217extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3218extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3219 struct inode *inode2, ext4_lblk_t lblk1,
3220 ext4_lblk_t lblk2, ext4_lblk_t count,
3221 int mark_unwritten,int *err);
3222extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3223
3224
3225extern void ext4_double_down_write_data_sem(struct inode *first,
3226 struct inode *second);
3227extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3228 struct inode *donor_inode);
3229extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3230 __u64 start_orig, __u64 start_donor,
3231 __u64 len, __u64 *moved_len);
3232
3233
3234extern int __init ext4_init_pageio(void);
3235extern void ext4_exit_pageio(void);
3236extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3237extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3238extern int ext4_put_io_end(ext4_io_end_t *io_end);
3239extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3240extern void ext4_io_submit_init(struct ext4_io_submit *io,
3241 struct writeback_control *wbc);
3242extern void ext4_end_io_rsv_work(struct work_struct *work);
3243extern void ext4_io_submit(struct ext4_io_submit *io);
3244extern int ext4_bio_write_page(struct ext4_io_submit *io,
3245 struct page *page,
3246 int len,
3247 struct writeback_control *wbc,
3248 bool keep_towrite);
3249
3250
3251extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3252
3253
3254
3255
3256
3257
3258#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3259
3260static inline int bitmap_uptodate(struct buffer_head *bh)
3261{
3262 return (buffer_uptodate(bh) &&
3263 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3264}
3265static inline void set_bitmap_uptodate(struct buffer_head *bh)
3266{
3267 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3268}
3269
3270#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3271
3272
3273#define EXT4_WQ_HASH_SZ 37
3274#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3275 EXT4_WQ_HASH_SZ])
3276extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3277
3278extern int ext4_resize_begin(struct super_block *sb);
3279extern void ext4_resize_end(struct super_block *sb);
3280
3281static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3282 struct ext4_io_end *io_end)
3283{
3284 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3285 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3286 atomic_inc(&EXT4_I(inode)->i_unwritten);
3287 }
3288}
3289
3290static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3291{
3292 struct inode *inode = io_end->inode;
3293
3294 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3295 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3296
3297 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3298 wake_up_all(ext4_ioend_wq(inode));
3299 }
3300}
3301
3302extern const struct iomap_ops ext4_iomap_ops;
3303
3304#endif
3305
3306#define EFSBADCRC EBADMSG
3307#define EFSCORRUPTED EUCLEAN
3308
3309#endif
3310