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16#ifndef _EXT4_H
17#define _EXT4_H
18
19#include <linux/types.h>
20#include <linux/blkdev.h>
21#include <linux/magic.h>
22#include <linux/jbd2.h>
23#include <linux/quota.h>
24#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
28#include <linux/timer.h>
29#include <linux/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
32#include <crypto/hash.h>
33#ifdef __KERNEL__
34#include <linux/compat.h>
35#endif
36
37
38
39
40
41
42
43
44#undef EXT4FS_DEBUG
45
46
47
48
49#ifdef EXT4FS_DEBUG
50#define ext4_debug(f, a...) \
51 do { \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
55 } while (0)
56#else
57#define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
58#endif
59
60
61
62
63#define EXT_DEBUG__
64#ifdef EXT_DEBUG
65#define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
66#else
67#define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
68#endif
69
70#define EXT4_ERROR_INODE(inode, fmt, a...) \
71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
72
73#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
75
76#define EXT4_ERROR_FILE(file, block, fmt, a...) \
77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
78
79
80typedef int ext4_grpblk_t;
81
82
83typedef unsigned long long ext4_fsblk_t;
84
85
86typedef __u32 ext4_lblk_t;
87
88
89typedef unsigned int ext4_group_t;
90
91
92
93
94
95
96
97
98
99#define EXT4_MB_HINT_MERGE 0x0001
100
101#define EXT4_MB_HINT_RESERVED 0x0002
102
103#define EXT4_MB_HINT_METADATA 0x0004
104
105#define EXT4_MB_HINT_FIRST 0x0008
106
107#define EXT4_MB_HINT_BEST 0x0010
108
109#define EXT4_MB_HINT_DATA 0x0020
110
111#define EXT4_MB_HINT_NOPREALLOC 0x0040
112
113#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
114
115#define EXT4_MB_HINT_GOAL_ONLY 0x0100
116
117#define EXT4_MB_HINT_TRY_GOAL 0x0200
118
119#define EXT4_MB_DELALLOC_RESERVED 0x0400
120
121#define EXT4_MB_STREAM_ALLOC 0x0800
122
123#define EXT4_MB_USE_ROOT_BLOCKS 0x1000
124
125struct ext4_allocation_request {
126
127 struct inode *inode;
128
129 unsigned int len;
130
131 ext4_lblk_t logical;
132
133 ext4_lblk_t lleft;
134
135 ext4_lblk_t lright;
136
137 ext4_fsblk_t goal;
138
139 ext4_fsblk_t pleft;
140
141 ext4_fsblk_t pright;
142
143 unsigned int flags;
144};
145
146
147
148
149
150
151
152
153#define EXT4_MAP_NEW (1 << BH_New)
154#define EXT4_MAP_MAPPED (1 << BH_Mapped)
155#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
156#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
157#define EXT4_MAP_UNINIT (1 << BH_Uninit)
158
159
160
161
162
163
164
165#define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
166#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
168 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
169
170struct ext4_map_blocks {
171 ext4_fsblk_t m_pblk;
172 ext4_lblk_t m_lblk;
173 unsigned int m_len;
174 unsigned int m_flags;
175};
176
177
178
179
180struct mpage_da_data {
181 struct inode *inode;
182 sector_t b_blocknr;
183 size_t b_size;
184 unsigned long b_state;
185 unsigned long first_page, next_page;
186 struct writeback_control *wbc;
187 int io_done;
188 int pages_written;
189 int retval;
190};
191
192
193
194
195#define EXT4_IO_END_UNWRITTEN 0x0001
196#define EXT4_IO_END_ERROR 0x0002
197#define EXT4_IO_END_QUEUED 0x0004
198#define EXT4_IO_END_DIRECT 0x0008
199
200struct ext4_io_page {
201 struct page *p_page;
202 atomic_t p_count;
203};
204
205#define MAX_IO_PAGES 128
206
207
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209
210
211
212
213
214typedef struct ext4_io_end {
215 struct list_head list;
216 struct inode *inode;
217 unsigned int flag;
218 struct page *page;
219 loff_t offset;
220 ssize_t size;
221 struct work_struct work;
222 struct kiocb *iocb;
223 int result;
224 int num_io_pages;
225 struct ext4_io_page *pages[MAX_IO_PAGES];
226} ext4_io_end_t;
227
228struct ext4_io_submit {
229 int io_op;
230 struct bio *io_bio;
231 ext4_io_end_t *io_end;
232 struct ext4_io_page *io_page;
233 sector_t io_next_block;
234};
235
236
237
238
239#define EXT4_BAD_INO 1
240#define EXT4_ROOT_INO 2
241#define EXT4_USR_QUOTA_INO 3
242#define EXT4_GRP_QUOTA_INO 4
243#define EXT4_BOOT_LOADER_INO 5
244#define EXT4_UNDEL_DIR_INO 6
245#define EXT4_RESIZE_INO 7
246#define EXT4_JOURNAL_INO 8
247
248
249#define EXT4_GOOD_OLD_FIRST_INO 11
250
251
252
253
254#define EXT4_LINK_MAX 65000
255
256
257
258
259#define EXT4_MIN_BLOCK_SIZE 1024
260#define EXT4_MAX_BLOCK_SIZE 65536
261#define EXT4_MIN_BLOCK_LOG_SIZE 10
262#define EXT4_MAX_BLOCK_LOG_SIZE 16
263#ifdef __KERNEL__
264# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
265#else
266# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
267#endif
268#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
269#define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
270 EXT4_SB(s)->s_cluster_bits)
271#ifdef __KERNEL__
272# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
273# define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
274#else
275# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
276#endif
277#ifdef __KERNEL__
278#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
279#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
280#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
281#else
282#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
283 EXT4_GOOD_OLD_INODE_SIZE : \
284 (s)->s_inode_size)
285#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
286 EXT4_GOOD_OLD_FIRST_INO : \
287 (s)->s_first_ino)
288#endif
289#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
290
291
292#define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
293
294#define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
295
296#define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
297 (sbi)->s_cluster_bits)
298
299
300
301
302struct ext4_group_desc
303{
304 __le32 bg_block_bitmap_lo;
305 __le32 bg_inode_bitmap_lo;
306 __le32 bg_inode_table_lo;
307 __le16 bg_free_blocks_count_lo;
308 __le16 bg_free_inodes_count_lo;
309 __le16 bg_used_dirs_count_lo;
310 __le16 bg_flags;
311 __le32 bg_exclude_bitmap_lo;
312 __le16 bg_block_bitmap_csum_lo;
313 __le16 bg_inode_bitmap_csum_lo;
314 __le16 bg_itable_unused_lo;
315 __le16 bg_checksum;
316 __le32 bg_block_bitmap_hi;
317 __le32 bg_inode_bitmap_hi;
318 __le32 bg_inode_table_hi;
319 __le16 bg_free_blocks_count_hi;
320 __le16 bg_free_inodes_count_hi;
321 __le16 bg_used_dirs_count_hi;
322 __le16 bg_itable_unused_hi;
323 __le32 bg_exclude_bitmap_hi;
324 __le16 bg_block_bitmap_csum_hi;
325 __le16 bg_inode_bitmap_csum_hi;
326 __u32 bg_reserved;
327};
328
329#define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
330 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
331 sizeof(__le16))
332#define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
333 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
334 sizeof(__le16))
335
336
337
338
339
340struct flex_groups {
341 atomic_t free_inodes;
342 atomic_t free_clusters;
343 atomic_t used_dirs;
344};
345
346#define EXT4_BG_INODE_UNINIT 0x0001
347#define EXT4_BG_BLOCK_UNINIT 0x0002
348#define EXT4_BG_INODE_ZEROED 0x0004
349
350
351
352
353#define EXT4_MIN_DESC_SIZE 32
354#define EXT4_MIN_DESC_SIZE_64BIT 64
355#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
356#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
357#ifdef __KERNEL__
358# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
359# define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
360# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
361# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
362# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
363#else
364# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
365# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
366# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
367#endif
368
369
370
371
372#define EXT4_NDIR_BLOCKS 12
373#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
374#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
375#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
376#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
377
378
379
380
381#define EXT4_SECRM_FL 0x00000001
382#define EXT4_UNRM_FL 0x00000002
383#define EXT4_COMPR_FL 0x00000004
384#define EXT4_SYNC_FL 0x00000008
385#define EXT4_IMMUTABLE_FL 0x00000010
386#define EXT4_APPEND_FL 0x00000020
387#define EXT4_NODUMP_FL 0x00000040
388#define EXT4_NOATIME_FL 0x00000080
389
390#define EXT4_DIRTY_FL 0x00000100
391#define EXT4_COMPRBLK_FL 0x00000200
392#define EXT4_NOCOMPR_FL 0x00000400
393#define EXT4_ECOMPR_FL 0x00000800
394
395#define EXT4_INDEX_FL 0x00001000
396#define EXT4_IMAGIC_FL 0x00002000
397#define EXT4_JOURNAL_DATA_FL 0x00004000
398#define EXT4_NOTAIL_FL 0x00008000
399#define EXT4_DIRSYNC_FL 0x00010000
400#define EXT4_TOPDIR_FL 0x00020000
401#define EXT4_HUGE_FILE_FL 0x00040000
402#define EXT4_EXTENTS_FL 0x00080000
403#define EXT4_EA_INODE_FL 0x00200000
404#define EXT4_EOFBLOCKS_FL 0x00400000
405#define EXT4_INLINE_DATA_FL 0x10000000
406#define EXT4_RESERVED_FL 0x80000000
407
408#define EXT4_FL_USER_VISIBLE 0x004BDFFF
409#define EXT4_FL_USER_MODIFIABLE 0x004B80FF
410
411
412#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
413 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
414 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
415 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
416
417
418#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
419
420
421#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
422
423
424static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
425{
426 if (S_ISDIR(mode))
427 return flags;
428 else if (S_ISREG(mode))
429 return flags & EXT4_REG_FLMASK;
430 else
431 return flags & EXT4_OTHER_FLMASK;
432}
433
434
435
436
437enum {
438 EXT4_INODE_SECRM = 0,
439 EXT4_INODE_UNRM = 1,
440 EXT4_INODE_COMPR = 2,
441 EXT4_INODE_SYNC = 3,
442 EXT4_INODE_IMMUTABLE = 4,
443 EXT4_INODE_APPEND = 5,
444 EXT4_INODE_NODUMP = 6,
445 EXT4_INODE_NOATIME = 7,
446
447 EXT4_INODE_DIRTY = 8,
448 EXT4_INODE_COMPRBLK = 9,
449 EXT4_INODE_NOCOMPR = 10,
450 EXT4_INODE_ECOMPR = 11,
451
452 EXT4_INODE_INDEX = 12,
453 EXT4_INODE_IMAGIC = 13,
454 EXT4_INODE_JOURNAL_DATA = 14,
455 EXT4_INODE_NOTAIL = 15,
456 EXT4_INODE_DIRSYNC = 16,
457 EXT4_INODE_TOPDIR = 17,
458 EXT4_INODE_HUGE_FILE = 18,
459 EXT4_INODE_EXTENTS = 19,
460 EXT4_INODE_EA_INODE = 21,
461 EXT4_INODE_EOFBLOCKS = 22,
462 EXT4_INODE_INLINE_DATA = 28,
463 EXT4_INODE_RESERVED = 31,
464};
465
466
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473
474
475
476
477
478
479#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
480#define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
481
482static inline void ext4_check_flag_values(void)
483{
484 CHECK_FLAG_VALUE(SECRM);
485 CHECK_FLAG_VALUE(UNRM);
486 CHECK_FLAG_VALUE(COMPR);
487 CHECK_FLAG_VALUE(SYNC);
488 CHECK_FLAG_VALUE(IMMUTABLE);
489 CHECK_FLAG_VALUE(APPEND);
490 CHECK_FLAG_VALUE(NODUMP);
491 CHECK_FLAG_VALUE(NOATIME);
492 CHECK_FLAG_VALUE(DIRTY);
493 CHECK_FLAG_VALUE(COMPRBLK);
494 CHECK_FLAG_VALUE(NOCOMPR);
495 CHECK_FLAG_VALUE(ECOMPR);
496 CHECK_FLAG_VALUE(INDEX);
497 CHECK_FLAG_VALUE(IMAGIC);
498 CHECK_FLAG_VALUE(JOURNAL_DATA);
499 CHECK_FLAG_VALUE(NOTAIL);
500 CHECK_FLAG_VALUE(DIRSYNC);
501 CHECK_FLAG_VALUE(TOPDIR);
502 CHECK_FLAG_VALUE(HUGE_FILE);
503 CHECK_FLAG_VALUE(EXTENTS);
504 CHECK_FLAG_VALUE(EA_INODE);
505 CHECK_FLAG_VALUE(EOFBLOCKS);
506 CHECK_FLAG_VALUE(INLINE_DATA);
507 CHECK_FLAG_VALUE(RESERVED);
508}
509
510
511struct ext4_new_group_input {
512 __u32 group;
513 __u64 block_bitmap;
514 __u64 inode_bitmap;
515 __u64 inode_table;
516 __u32 blocks_count;
517 __u16 reserved_blocks;
518 __u16 unused;
519};
520
521#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
522struct compat_ext4_new_group_input {
523 u32 group;
524 compat_u64 block_bitmap;
525 compat_u64 inode_bitmap;
526 compat_u64 inode_table;
527 u32 blocks_count;
528 u16 reserved_blocks;
529 u16 unused;
530};
531#endif
532
533
534struct ext4_new_group_data {
535 __u32 group;
536 __u64 block_bitmap;
537 __u64 inode_bitmap;
538 __u64 inode_table;
539 __u32 blocks_count;
540 __u16 reserved_blocks;
541 __u16 unused;
542 __u32 free_blocks_count;
543};
544
545
546enum {
547 BLOCK_BITMAP = 0,
548 INODE_BITMAP,
549 INODE_TABLE,
550 GROUP_TABLE_COUNT,
551};
552
553
554
555
556
557
558#define EXT4_GET_BLOCKS_CREATE 0x0001
559
560#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
561#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
562 EXT4_GET_BLOCKS_CREATE)
563
564
565
566#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
567
568
569
570#define EXT4_GET_BLOCKS_PRE_IO 0x0008
571#define EXT4_GET_BLOCKS_CONVERT 0x0010
572#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
573 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
574
575#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
576 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
577
578#define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
579
580#define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
581
582#define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
583
584#define EXT4_GET_BLOCKS_NO_LOCK 0x0100
585
586
587
588
589#define EXT4_FREE_BLOCKS_METADATA 0x0001
590#define EXT4_FREE_BLOCKS_FORGET 0x0002
591#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
592#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
593#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
594#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
595
596
597
598
599#define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
600
601
602
603
604#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
605#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
606#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
607#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
608#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
609#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
610#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
611#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
612#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
613#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
614#define EXT4_IOC_MIGRATE _IO('f', 9)
615
616
617#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
618#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
619#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
620
621#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
622
623
624
625#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
626#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
627#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
628#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
629#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
630#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
631#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
632#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
633#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
634#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
635#endif
636
637
638#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
639
640
641
642
643struct ext4_inode {
644 __le16 i_mode;
645 __le16 i_uid;
646 __le32 i_size_lo;
647 __le32 i_atime;
648 __le32 i_ctime;
649 __le32 i_mtime;
650 __le32 i_dtime;
651 __le16 i_gid;
652 __le16 i_links_count;
653 __le32 i_blocks_lo;
654 __le32 i_flags;
655 union {
656 struct {
657 __le32 l_i_version;
658 } linux1;
659 struct {
660 __u32 h_i_translator;
661 } hurd1;
662 struct {
663 __u32 m_i_reserved1;
664 } masix1;
665 } osd1;
666 __le32 i_block[EXT4_N_BLOCKS];
667 __le32 i_generation;
668 __le32 i_file_acl_lo;
669 __le32 i_size_high;
670 __le32 i_obso_faddr;
671 union {
672 struct {
673 __le16 l_i_blocks_high;
674 __le16 l_i_file_acl_high;
675 __le16 l_i_uid_high;
676 __le16 l_i_gid_high;
677 __le16 l_i_checksum_lo;
678 __le16 l_i_reserved;
679 } linux2;
680 struct {
681 __le16 h_i_reserved1;
682 __u16 h_i_mode_high;
683 __u16 h_i_uid_high;
684 __u16 h_i_gid_high;
685 __u32 h_i_author;
686 } hurd2;
687 struct {
688 __le16 h_i_reserved1;
689 __le16 m_i_file_acl_high;
690 __u32 m_i_reserved2[2];
691 } masix2;
692 } osd2;
693 __le16 i_extra_isize;
694 __le16 i_checksum_hi;
695 __le32 i_ctime_extra;
696 __le32 i_mtime_extra;
697 __le32 i_atime_extra;
698 __le32 i_crtime;
699 __le32 i_crtime_extra;
700 __le32 i_version_hi;
701};
702
703struct move_extent {
704 __u32 reserved;
705 __u32 donor_fd;
706 __u64 orig_start;
707 __u64 donor_start;
708 __u64 len;
709 __u64 moved_len;
710};
711
712#define EXT4_EPOCH_BITS 2
713#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
714#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
715
716
717
718
719
720
721
722
723
724
725
726#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
727 ((offsetof(typeof(*ext4_inode), field) + \
728 sizeof((ext4_inode)->field)) \
729 <= (EXT4_GOOD_OLD_INODE_SIZE + \
730 (einode)->i_extra_isize)) \
731
732static inline __le32 ext4_encode_extra_time(struct timespec *time)
733{
734 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
735 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
736 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
737}
738
739static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
740{
741 if (sizeof(time->tv_sec) > 4)
742 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
743 << 32;
744 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
745}
746
747#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
748do { \
749 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
750 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
751 (raw_inode)->xtime ## _extra = \
752 ext4_encode_extra_time(&(inode)->xtime); \
753} while (0)
754
755#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
756do { \
757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
758 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
759 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
760 (raw_inode)->xtime ## _extra = \
761 ext4_encode_extra_time(&(einode)->xtime); \
762} while (0)
763
764#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
765do { \
766 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
767 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
768 ext4_decode_extra_time(&(inode)->xtime, \
769 raw_inode->xtime ## _extra); \
770 else \
771 (inode)->xtime.tv_nsec = 0; \
772} while (0)
773
774#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
775do { \
776 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
777 (einode)->xtime.tv_sec = \
778 (signed)le32_to_cpu((raw_inode)->xtime); \
779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
780 ext4_decode_extra_time(&(einode)->xtime, \
781 raw_inode->xtime ## _extra); \
782 else \
783 (einode)->xtime.tv_nsec = 0; \
784} while (0)
785
786#define i_disk_version osd1.linux1.l_i_version
787
788#if defined(__KERNEL__) || defined(__linux__)
789#define i_reserved1 osd1.linux1.l_i_reserved1
790#define i_file_acl_high osd2.linux2.l_i_file_acl_high
791#define i_blocks_high osd2.linux2.l_i_blocks_high
792#define i_uid_low i_uid
793#define i_gid_low i_gid
794#define i_uid_high osd2.linux2.l_i_uid_high
795#define i_gid_high osd2.linux2.l_i_gid_high
796#define i_checksum_lo osd2.linux2.l_i_checksum_lo
797
798#elif defined(__GNU__)
799
800#define i_translator osd1.hurd1.h_i_translator
801#define i_uid_high osd2.hurd2.h_i_uid_high
802#define i_gid_high osd2.hurd2.h_i_gid_high
803#define i_author osd2.hurd2.h_i_author
804
805#elif defined(__masix__)
806
807#define i_reserved1 osd1.masix1.m_i_reserved1
808#define i_file_acl_high osd2.masix2.m_i_file_acl_high
809#define i_reserved2 osd2.masix2.m_i_reserved2
810
811#endif
812
813
814
815
816
817
818struct ext4_ext_cache {
819 ext4_fsblk_t ec_start;
820 ext4_lblk_t ec_block;
821 __u32 ec_len;
822};
823
824#include "extents_status.h"
825
826
827
828
829struct ext4_inode_info {
830 __le32 i_data[15];
831 __u32 i_dtime;
832 ext4_fsblk_t i_file_acl;
833
834
835
836
837
838
839
840
841 ext4_group_t i_block_group;
842 ext4_lblk_t i_dir_start_lookup;
843#if (BITS_PER_LONG < 64)
844 unsigned long i_state_flags;
845#endif
846 unsigned long i_flags;
847
848
849
850
851
852
853
854
855 struct rw_semaphore xattr_sem;
856
857 struct list_head i_orphan;
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874 loff_t i_disksize;
875
876
877
878
879
880
881
882
883
884
885
886 struct rw_semaphore i_data_sem;
887 struct inode vfs_inode;
888 struct jbd2_inode *jinode;
889
890 struct ext4_ext_cache i_cached_extent;
891
892
893
894
895 struct timespec i_crtime;
896
897
898 struct list_head i_prealloc_list;
899 spinlock_t i_prealloc_lock;
900
901
902 struct ext4_es_tree i_es_tree;
903 rwlock_t i_es_lock;
904
905
906 ext4_group_t i_last_alloc_group;
907
908
909
910 unsigned int i_reserved_data_blocks;
911 unsigned int i_reserved_meta_blocks;
912 unsigned int i_allocated_meta_blocks;
913 ext4_lblk_t i_da_metadata_calc_last_lblock;
914 int i_da_metadata_calc_len;
915
916
917 __u16 i_extra_isize;
918
919
920 u16 i_inline_off;
921 u16 i_inline_size;
922
923#ifdef CONFIG_QUOTA
924
925 qsize_t i_reserved_quota;
926#endif
927
928
929 struct list_head i_completed_io_list;
930 spinlock_t i_completed_io_lock;
931 atomic_t i_ioend_count;
932 atomic_t i_unwritten;
933
934 spinlock_t i_block_reservation_lock;
935
936
937
938
939
940 tid_t i_sync_tid;
941 tid_t i_datasync_tid;
942
943
944 __u32 i_csum_seed;
945};
946
947
948
949
950#define EXT4_VALID_FS 0x0001
951#define EXT4_ERROR_FS 0x0002
952#define EXT4_ORPHAN_FS 0x0004
953
954
955
956
957#define EXT2_FLAGS_SIGNED_HASH 0x0001
958#define EXT2_FLAGS_UNSIGNED_HASH 0x0002
959#define EXT2_FLAGS_TEST_FILESYS 0x0004
960
961
962
963
964#define EXT4_MOUNT_GRPID 0x00004
965#define EXT4_MOUNT_DEBUG 0x00008
966#define EXT4_MOUNT_ERRORS_CONT 0x00010
967#define EXT4_MOUNT_ERRORS_RO 0x00020
968#define EXT4_MOUNT_ERRORS_PANIC 0x00040
969#define EXT4_MOUNT_ERRORS_MASK 0x00070
970#define EXT4_MOUNT_MINIX_DF 0x00080
971#define EXT4_MOUNT_NOLOAD 0x00100
972#define EXT4_MOUNT_DATA_FLAGS 0x00C00
973#define EXT4_MOUNT_JOURNAL_DATA 0x00400
974#define EXT4_MOUNT_ORDERED_DATA 0x00800
975#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00
976#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000
977#define EXT4_MOUNT_NO_UID32 0x02000
978#define EXT4_MOUNT_XATTR_USER 0x04000
979#define EXT4_MOUNT_POSIX_ACL 0x08000
980#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000
981#define EXT4_MOUNT_BARRIER 0x20000
982#define EXT4_MOUNT_QUOTA 0x80000
983#define EXT4_MOUNT_USRQUOTA 0x100000
984#define EXT4_MOUNT_GRPQUOTA 0x200000
985#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000
986#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000
987#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000
988#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000
989#define EXT4_MOUNT_DELALLOC 0x8000000
990#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000
991#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000
992#define EXT4_MOUNT_DISCARD 0x40000000
993#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000
994
995#define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001
996
997
998#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
999 ~EXT4_MOUNT_##opt
1000#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1001 EXT4_MOUNT_##opt
1002#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1003 EXT4_MOUNT_##opt)
1004
1005#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1006 ~EXT4_MOUNT2_##opt
1007#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1008 EXT4_MOUNT2_##opt
1009#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1010 EXT4_MOUNT2_##opt)
1011
1012#define ext4_test_and_set_bit __test_and_set_bit_le
1013#define ext4_set_bit __set_bit_le
1014#define ext4_set_bit_atomic ext2_set_bit_atomic
1015#define ext4_test_and_clear_bit __test_and_clear_bit_le
1016#define ext4_clear_bit __clear_bit_le
1017#define ext4_clear_bit_atomic ext2_clear_bit_atomic
1018#define ext4_test_bit test_bit_le
1019#define ext4_find_next_zero_bit find_next_zero_bit_le
1020#define ext4_find_next_bit find_next_bit_le
1021
1022extern void ext4_set_bits(void *bm, int cur, int len);
1023
1024
1025
1026
1027#define EXT4_DFL_MAX_MNT_COUNT 20
1028#define EXT4_DFL_CHECKINTERVAL 0
1029
1030
1031
1032
1033#define EXT4_ERRORS_CONTINUE 1
1034#define EXT4_ERRORS_RO 2
1035#define EXT4_ERRORS_PANIC 3
1036#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1037
1038
1039#define EXT4_CRC32C_CHKSUM 1
1040
1041
1042
1043
1044struct ext4_super_block {
1045 __le32 s_inodes_count;
1046 __le32 s_blocks_count_lo;
1047 __le32 s_r_blocks_count_lo;
1048 __le32 s_free_blocks_count_lo;
1049 __le32 s_free_inodes_count;
1050 __le32 s_first_data_block;
1051 __le32 s_log_block_size;
1052 __le32 s_log_cluster_size;
1053 __le32 s_blocks_per_group;
1054 __le32 s_clusters_per_group;
1055 __le32 s_inodes_per_group;
1056 __le32 s_mtime;
1057 __le32 s_wtime;
1058 __le16 s_mnt_count;
1059 __le16 s_max_mnt_count;
1060 __le16 s_magic;
1061 __le16 s_state;
1062 __le16 s_errors;
1063 __le16 s_minor_rev_level;
1064 __le32 s_lastcheck;
1065 __le32 s_checkinterval;
1066 __le32 s_creator_os;
1067 __le32 s_rev_level;
1068 __le16 s_def_resuid;
1069 __le16 s_def_resgid;
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083 __le32 s_first_ino;
1084 __le16 s_inode_size;
1085 __le16 s_block_group_nr;
1086 __le32 s_feature_compat;
1087 __le32 s_feature_incompat;
1088 __le32 s_feature_ro_compat;
1089 __u8 s_uuid[16];
1090 char s_volume_name[16];
1091 char s_last_mounted[64];
1092 __le32 s_algorithm_usage_bitmap;
1093
1094
1095
1096
1097 __u8 s_prealloc_blocks;
1098 __u8 s_prealloc_dir_blocks;
1099 __le16 s_reserved_gdt_blocks;
1100
1101
1102
1103 __u8 s_journal_uuid[16];
1104 __le32 s_journal_inum;
1105 __le32 s_journal_dev;
1106 __le32 s_last_orphan;
1107 __le32 s_hash_seed[4];
1108 __u8 s_def_hash_version;
1109 __u8 s_jnl_backup_type;
1110 __le16 s_desc_size;
1111 __le32 s_default_mount_opts;
1112 __le32 s_first_meta_bg;
1113 __le32 s_mkfs_time;
1114 __le32 s_jnl_blocks[17];
1115
1116 __le32 s_blocks_count_hi;
1117 __le32 s_r_blocks_count_hi;
1118 __le32 s_free_blocks_count_hi;
1119 __le16 s_min_extra_isize;
1120 __le16 s_want_extra_isize;
1121 __le32 s_flags;
1122 __le16 s_raid_stride;
1123 __le16 s_mmp_update_interval;
1124 __le64 s_mmp_block;
1125 __le32 s_raid_stripe_width;
1126 __u8 s_log_groups_per_flex;
1127 __u8 s_checksum_type;
1128 __le16 s_reserved_pad;
1129 __le64 s_kbytes_written;
1130 __le32 s_snapshot_inum;
1131 __le32 s_snapshot_id;
1132 __le64 s_snapshot_r_blocks_count;
1133
1134 __le32 s_snapshot_list;
1135
1136#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1137 __le32 s_error_count;
1138 __le32 s_first_error_time;
1139 __le32 s_first_error_ino;
1140 __le64 s_first_error_block;
1141 __u8 s_first_error_func[32];
1142 __le32 s_first_error_line;
1143 __le32 s_last_error_time;
1144 __le32 s_last_error_ino;
1145 __le32 s_last_error_line;
1146 __le64 s_last_error_block;
1147 __u8 s_last_error_func[32];
1148#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1149 __u8 s_mount_opts[64];
1150 __le32 s_usr_quota_inum;
1151 __le32 s_grp_quota_inum;
1152 __le32 s_overhead_clusters;
1153 __le32 s_reserved[108];
1154 __le32 s_checksum;
1155};
1156
1157#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1158
1159#ifdef __KERNEL__
1160
1161
1162
1163
1164#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1165#define EXT4_MF_FS_ABORTED 0x0002
1166
1167
1168
1169
1170struct ext4_sb_info {
1171 unsigned long s_desc_size;
1172 unsigned long s_inodes_per_block;
1173 unsigned long s_blocks_per_group;
1174 unsigned long s_clusters_per_group;
1175 unsigned long s_inodes_per_group;
1176 unsigned long s_itb_per_group;
1177 unsigned long s_gdb_count;
1178 unsigned long s_desc_per_block;
1179 ext4_group_t s_groups_count;
1180 ext4_group_t s_blockfile_groups;
1181 unsigned long s_overhead;
1182 unsigned int s_cluster_ratio;
1183 unsigned int s_cluster_bits;
1184 loff_t s_bitmap_maxbytes;
1185 struct buffer_head * s_sbh;
1186 struct ext4_super_block *s_es;
1187 struct buffer_head **s_group_desc;
1188 unsigned int s_mount_opt;
1189 unsigned int s_mount_opt2;
1190 unsigned int s_mount_flags;
1191 unsigned int s_def_mount_opt;
1192 ext4_fsblk_t s_sb_block;
1193 kuid_t s_resuid;
1194 kgid_t s_resgid;
1195 unsigned short s_mount_state;
1196 unsigned short s_pad;
1197 int s_addr_per_block_bits;
1198 int s_desc_per_block_bits;
1199 int s_inode_size;
1200 int s_first_ino;
1201 unsigned int s_inode_readahead_blks;
1202 unsigned int s_inode_goal;
1203 spinlock_t s_next_gen_lock;
1204 u32 s_next_generation;
1205 u32 s_hash_seed[4];
1206 int s_def_hash_version;
1207 int s_hash_unsigned;
1208 struct percpu_counter s_freeclusters_counter;
1209 struct percpu_counter s_freeinodes_counter;
1210 struct percpu_counter s_dirs_counter;
1211 struct percpu_counter s_dirtyclusters_counter;
1212 struct blockgroup_lock *s_blockgroup_lock;
1213 struct proc_dir_entry *s_proc;
1214 struct kobject s_kobj;
1215 struct completion s_kobj_unregister;
1216 struct super_block *s_sb;
1217
1218
1219 struct journal_s *s_journal;
1220 struct list_head s_orphan;
1221 struct mutex s_orphan_lock;
1222 unsigned long s_resize_flags;
1223
1224 unsigned long s_commit_interval;
1225 u32 s_max_batch_time;
1226 u32 s_min_batch_time;
1227 struct block_device *journal_bdev;
1228#ifdef CONFIG_QUOTA
1229 char *s_qf_names[MAXQUOTAS];
1230 int s_jquota_fmt;
1231#endif
1232 unsigned int s_want_extra_isize;
1233 struct rb_root system_blks;
1234
1235#ifdef EXTENTS_STATS
1236
1237 unsigned long s_ext_min;
1238 unsigned long s_ext_max;
1239 unsigned long s_depth_max;
1240 spinlock_t s_ext_stats_lock;
1241 unsigned long s_ext_blocks;
1242 unsigned long s_ext_extents;
1243#endif
1244
1245
1246 struct ext4_group_info ***s_group_info;
1247 struct inode *s_buddy_cache;
1248 spinlock_t s_md_lock;
1249 unsigned short *s_mb_offsets;
1250 unsigned int *s_mb_maxs;
1251 unsigned int s_group_info_size;
1252
1253
1254 unsigned long s_stripe;
1255 unsigned int s_mb_stream_request;
1256 unsigned int s_mb_max_to_scan;
1257 unsigned int s_mb_min_to_scan;
1258 unsigned int s_mb_stats;
1259 unsigned int s_mb_order2_reqs;
1260 unsigned int s_mb_group_prealloc;
1261 unsigned int s_max_writeback_mb_bump;
1262 unsigned int s_max_dir_size_kb;
1263
1264 unsigned long s_mb_last_group;
1265 unsigned long s_mb_last_start;
1266
1267
1268 atomic_t s_bal_reqs;
1269 atomic_t s_bal_success;
1270 atomic_t s_bal_allocated;
1271 atomic_t s_bal_ex_scanned;
1272 atomic_t s_bal_goals;
1273 atomic_t s_bal_breaks;
1274 atomic_t s_bal_2orders;
1275 spinlock_t s_bal_lock;
1276 unsigned long s_mb_buddies_generated;
1277 unsigned long long s_mb_generation_time;
1278 atomic_t s_mb_lost_chunks;
1279 atomic_t s_mb_preallocated;
1280 atomic_t s_mb_discarded;
1281 atomic_t s_lock_busy;
1282
1283
1284 struct ext4_locality_group __percpu *s_locality_groups;
1285
1286
1287 unsigned long s_sectors_written_start;
1288 u64 s_kbytes_written;
1289
1290
1291 unsigned int s_extent_max_zeroout_kb;
1292
1293 unsigned int s_log_groups_per_flex;
1294 struct flex_groups *s_flex_groups;
1295 ext4_group_t s_flex_groups_allocated;
1296
1297
1298 struct workqueue_struct *dio_unwritten_wq;
1299
1300
1301 struct timer_list s_err_report;
1302
1303
1304 struct ext4_li_request *s_li_request;
1305
1306 unsigned int s_li_wait_mult;
1307
1308
1309 struct task_struct *s_mmp_tsk;
1310
1311
1312 atomic_t s_last_trim_minblks;
1313
1314
1315 struct crypto_shash *s_chksum_driver;
1316
1317
1318 __u32 s_csum_seed;
1319};
1320
1321static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1322{
1323 return sb->s_fs_info;
1324}
1325static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1326{
1327 return container_of(inode, struct ext4_inode_info, vfs_inode);
1328}
1329
1330static inline struct timespec ext4_current_time(struct inode *inode)
1331{
1332 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1333 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1334}
1335
1336static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1337{
1338 return ino == EXT4_ROOT_INO ||
1339 ino == EXT4_USR_QUOTA_INO ||
1340 ino == EXT4_GRP_QUOTA_INO ||
1341 ino == EXT4_JOURNAL_INO ||
1342 ino == EXT4_RESIZE_INO ||
1343 (ino >= EXT4_FIRST_INO(sb) &&
1344 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1345}
1346
1347static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1348 struct ext4_io_end *io_end)
1349{
1350 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1351 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1352 atomic_inc(&EXT4_I(inode)->i_unwritten);
1353 }
1354}
1355
1356static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1357{
1358 return inode->i_private;
1359}
1360
1361static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1362{
1363 inode->i_private = io;
1364}
1365
1366
1367
1368
1369enum {
1370 EXT4_STATE_JDATA,
1371 EXT4_STATE_NEW,
1372 EXT4_STATE_XATTR,
1373 EXT4_STATE_NO_EXPAND,
1374 EXT4_STATE_DA_ALLOC_CLOSE,
1375 EXT4_STATE_EXT_MIGRATE,
1376 EXT4_STATE_DIO_UNWRITTEN,
1377 EXT4_STATE_NEWENTRY,
1378 EXT4_STATE_DELALLOC_RESERVED,
1379 EXT4_STATE_DIOREAD_LOCK,
1380
1381 EXT4_STATE_MAY_INLINE_DATA,
1382};
1383
1384#define EXT4_INODE_BIT_FNS(name, field, offset) \
1385static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1386{ \
1387 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1388} \
1389static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1390{ \
1391 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1392} \
1393static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1394{ \
1395 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1396}
1397
1398EXT4_INODE_BIT_FNS(flag, flags, 0)
1399#if (BITS_PER_LONG < 64)
1400EXT4_INODE_BIT_FNS(state, state_flags, 0)
1401
1402static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1403{
1404 (ei)->i_state_flags = 0;
1405}
1406#else
1407EXT4_INODE_BIT_FNS(state, flags, 32)
1408
1409static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1410{
1411
1412}
1413#endif
1414#else
1415
1416
1417
1418#define EXT4_SB(sb) (sb)
1419#endif
1420
1421#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1422
1423
1424
1425
1426#define EXT4_OS_LINUX 0
1427#define EXT4_OS_HURD 1
1428#define EXT4_OS_MASIX 2
1429#define EXT4_OS_FREEBSD 3
1430#define EXT4_OS_LITES 4
1431
1432
1433
1434
1435#define EXT4_GOOD_OLD_REV 0
1436#define EXT4_DYNAMIC_REV 1
1437
1438#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1439#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1440
1441#define EXT4_GOOD_OLD_INODE_SIZE 128
1442
1443
1444
1445
1446
1447#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1448 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1449#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1450 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1451#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1452 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1453#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1454 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1455#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1456 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1457#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1458 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1459#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1460 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1461#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1462 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1463#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1464 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1465
1466#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1467#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1468#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1469#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1470#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1471#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1472
1473#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1474#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1475#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1476#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1477#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1478#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1479#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1480#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1481#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1482
1483
1484
1485
1486
1487
1488#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1489
1490#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1491#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1492#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
1493#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
1494#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1495#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
1496#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1497#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1498#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1499#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
1500#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
1501#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000
1502#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000
1503#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000
1504
1505#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1506#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1507 EXT4_FEATURE_INCOMPAT_META_BG)
1508#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1509 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1510 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1511
1512#define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1513#define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1514 EXT4_FEATURE_INCOMPAT_RECOVER| \
1515 EXT4_FEATURE_INCOMPAT_META_BG)
1516#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1517 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1518 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1519
1520#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1521#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1522 EXT4_FEATURE_INCOMPAT_RECOVER| \
1523 EXT4_FEATURE_INCOMPAT_META_BG| \
1524 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1525 EXT4_FEATURE_INCOMPAT_64BIT| \
1526 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1527 EXT4_FEATURE_INCOMPAT_MMP | \
1528 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1529#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1530 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1531 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1532 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1533 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1534 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1535 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1536 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1537 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1538 EXT4_FEATURE_RO_COMPAT_QUOTA)
1539
1540
1541
1542
1543#define EXT4_DEF_RESUID 0
1544#define EXT4_DEF_RESGID 0
1545
1546#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1547
1548
1549
1550
1551#define EXT4_DEFM_DEBUG 0x0001
1552#define EXT4_DEFM_BSDGROUPS 0x0002
1553#define EXT4_DEFM_XATTR_USER 0x0004
1554#define EXT4_DEFM_ACL 0x0008
1555#define EXT4_DEFM_UID16 0x0010
1556#define EXT4_DEFM_JMODE 0x0060
1557#define EXT4_DEFM_JMODE_DATA 0x0020
1558#define EXT4_DEFM_JMODE_ORDERED 0x0040
1559#define EXT4_DEFM_JMODE_WBACK 0x0060
1560#define EXT4_DEFM_NOBARRIER 0x0100
1561#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1562#define EXT4_DEFM_DISCARD 0x0400
1563#define EXT4_DEFM_NODELALLOC 0x0800
1564
1565
1566
1567
1568#define EXT4_DEF_MIN_BATCH_TIME 0
1569#define EXT4_DEF_MAX_BATCH_TIME 15000
1570
1571
1572
1573
1574
1575#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1576
1577
1578
1579
1580#define EXT4_NAME_LEN 255
1581
1582struct ext4_dir_entry {
1583 __le32 inode;
1584 __le16 rec_len;
1585 __le16 name_len;
1586 char name[EXT4_NAME_LEN];
1587};
1588
1589
1590
1591
1592
1593
1594
1595struct ext4_dir_entry_2 {
1596 __le32 inode;
1597 __le16 rec_len;
1598 __u8 name_len;
1599 __u8 file_type;
1600 char name[EXT4_NAME_LEN];
1601};
1602
1603
1604
1605
1606
1607struct ext4_dir_entry_tail {
1608 __le32 det_reserved_zero1;
1609 __le16 det_rec_len;
1610 __u8 det_reserved_zero2;
1611 __u8 det_reserved_ft;
1612 __le32 det_checksum;
1613};
1614
1615#define EXT4_DIRENT_TAIL(block, blocksize) \
1616 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1617 ((blocksize) - \
1618 sizeof(struct ext4_dir_entry_tail))))
1619
1620
1621
1622
1623
1624#define EXT4_FT_UNKNOWN 0
1625#define EXT4_FT_REG_FILE 1
1626#define EXT4_FT_DIR 2
1627#define EXT4_FT_CHRDEV 3
1628#define EXT4_FT_BLKDEV 4
1629#define EXT4_FT_FIFO 5
1630#define EXT4_FT_SOCK 6
1631#define EXT4_FT_SYMLINK 7
1632
1633#define EXT4_FT_MAX 8
1634
1635#define EXT4_FT_DIR_CSUM 0xDE
1636
1637
1638
1639
1640
1641
1642#define EXT4_DIR_PAD 4
1643#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1644#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1645 ~EXT4_DIR_ROUND)
1646#define EXT4_MAX_REC_LEN ((1<<16)-1)
1647
1648
1649
1650
1651
1652static inline unsigned int
1653ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1654{
1655 unsigned len = le16_to_cpu(dlen);
1656
1657#if (PAGE_CACHE_SIZE >= 65536)
1658 if (len == EXT4_MAX_REC_LEN || len == 0)
1659 return blocksize;
1660 return (len & 65532) | ((len & 3) << 16);
1661#else
1662 return len;
1663#endif
1664}
1665
1666static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1667{
1668 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1669 BUG();
1670#if (PAGE_CACHE_SIZE >= 65536)
1671 if (len < 65536)
1672 return cpu_to_le16(len);
1673 if (len == blocksize) {
1674 if (blocksize == 65536)
1675 return cpu_to_le16(EXT4_MAX_REC_LEN);
1676 else
1677 return cpu_to_le16(0);
1678 }
1679 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1680#else
1681 return cpu_to_le16(len);
1682#endif
1683}
1684
1685
1686
1687
1688
1689
1690#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1691 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1692 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1693#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1694#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1695
1696
1697
1698#define DX_HASH_LEGACY 0
1699#define DX_HASH_HALF_MD4 1
1700#define DX_HASH_TEA 2
1701#define DX_HASH_LEGACY_UNSIGNED 3
1702#define DX_HASH_HALF_MD4_UNSIGNED 4
1703#define DX_HASH_TEA_UNSIGNED 5
1704
1705static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1706 const void *address, unsigned int length)
1707{
1708 struct {
1709 struct shash_desc shash;
1710 char ctx[4];
1711 } desc;
1712 int err;
1713
1714 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1715
1716 desc.shash.tfm = sbi->s_chksum_driver;
1717 desc.shash.flags = 0;
1718 *(u32 *)desc.ctx = crc;
1719
1720 err = crypto_shash_update(&desc.shash, address, length);
1721 BUG_ON(err);
1722
1723 return *(u32 *)desc.ctx;
1724}
1725
1726#ifdef __KERNEL__
1727
1728
1729struct dx_hash_info
1730{
1731 u32 hash;
1732 u32 minor_hash;
1733 int hash_version;
1734 u32 *seed;
1735};
1736
1737
1738
1739#define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1740#define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1741
1742
1743
1744
1745
1746#define HASH_NB_ALWAYS 1
1747
1748
1749
1750
1751
1752struct ext4_iloc
1753{
1754 struct buffer_head *bh;
1755 unsigned long offset;
1756 ext4_group_t block_group;
1757};
1758
1759static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1760{
1761 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1762}
1763
1764
1765
1766
1767
1768
1769struct dir_private_info {
1770 struct rb_root root;
1771 struct rb_node *curr_node;
1772 struct fname *extra_fname;
1773 loff_t last_pos;
1774 __u32 curr_hash;
1775 __u32 curr_minor_hash;
1776 __u32 next_hash;
1777};
1778
1779
1780static inline ext4_fsblk_t
1781ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1782{
1783 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1784 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1785}
1786
1787
1788
1789
1790#define ERR_BAD_DX_DIR -75000
1791
1792void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1793 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1794
1795
1796
1797
1798#define EXT4_DEF_LI_WAIT_MULT 10
1799#define EXT4_DEF_LI_MAX_START_DELAY 5
1800#define EXT4_LAZYINIT_QUIT 0x0001
1801#define EXT4_LAZYINIT_RUNNING 0x0002
1802
1803
1804
1805
1806struct ext4_lazy_init {
1807 unsigned long li_state;
1808 struct list_head li_request_list;
1809 struct mutex li_list_mtx;
1810};
1811
1812struct ext4_li_request {
1813 struct super_block *lr_super;
1814 struct ext4_sb_info *lr_sbi;
1815 ext4_group_t lr_next_group;
1816 struct list_head lr_request;
1817 unsigned long lr_next_sched;
1818 unsigned long lr_timeout;
1819};
1820
1821struct ext4_features {
1822 struct kobject f_kobj;
1823 struct completion f_kobj_unregister;
1824};
1825
1826
1827
1828
1829
1830
1831
1832
1833#define EXT4_MMP_MAGIC 0x004D4D50U
1834#define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U
1835#define EXT4_MMP_SEQ_FSCK 0xE24D4D50U
1836#define EXT4_MMP_SEQ_MAX 0xE24D4D4FU
1837
1838struct mmp_struct {
1839 __le32 mmp_magic;
1840 __le32 mmp_seq;
1841
1842
1843
1844
1845
1846 __le64 mmp_time;
1847 char mmp_nodename[64];
1848 char mmp_bdevname[32];
1849
1850
1851
1852
1853
1854
1855 __le16 mmp_check_interval;
1856
1857 __le16 mmp_pad1;
1858 __le32 mmp_pad2[226];
1859 __le32 mmp_checksum;
1860};
1861
1862
1863struct mmpd_data {
1864 struct buffer_head *bh;
1865 struct super_block *sb;
1866};
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876#define EXT4_MMP_CHECK_MULT 2UL
1877
1878
1879
1880
1881#define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1882
1883
1884
1885
1886#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896# define NORET_TYPE
1897# define ATTRIB_NORET __attribute__((noreturn))
1898# define NORET_AND noreturn,
1899
1900
1901extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1902void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1903 struct ext4_group_desc *gdp,
1904 struct buffer_head *bh, int sz);
1905int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1906 struct ext4_group_desc *gdp,
1907 struct buffer_head *bh, int sz);
1908void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1909 struct ext4_group_desc *gdp,
1910 struct buffer_head *bh);
1911int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1912 struct ext4_group_desc *gdp,
1913 struct buffer_head *bh);
1914
1915
1916extern void ext4_validate_block_bitmap(struct super_block *sb,
1917 struct ext4_group_desc *desc,
1918 unsigned int block_group,
1919 struct buffer_head *bh);
1920extern unsigned int ext4_block_group(struct super_block *sb,
1921 ext4_fsblk_t blocknr);
1922extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1923 ext4_fsblk_t blocknr);
1924extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1925extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1926 ext4_group_t group);
1927extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1928 ext4_fsblk_t goal,
1929 unsigned int flags,
1930 unsigned long *count,
1931 int *errp);
1932extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1933 s64 nclusters, unsigned int flags);
1934extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1935extern void ext4_check_blocks_bitmap(struct super_block *);
1936extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1937 ext4_group_t block_group,
1938 struct buffer_head ** bh);
1939extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1940
1941extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1942 ext4_group_t block_group);
1943extern int ext4_wait_block_bitmap(struct super_block *sb,
1944 ext4_group_t block_group,
1945 struct buffer_head *bh);
1946extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1947 ext4_group_t block_group);
1948extern void ext4_init_block_bitmap(struct super_block *sb,
1949 struct buffer_head *bh,
1950 ext4_group_t group,
1951 struct ext4_group_desc *desc);
1952extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1953 ext4_group_t block_group,
1954 struct ext4_group_desc *gdp);
1955extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1956 ext4_group_t block_group,
1957 struct ext4_group_desc *gdp);
1958ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1959
1960
1961extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1962 struct file *,
1963 struct ext4_dir_entry_2 *,
1964 struct buffer_head *, char *, int,
1965 unsigned int);
1966#define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1967 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1968 (de), (bh), (buf), (size), (offset)))
1969extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1970 __u32 minor_hash,
1971 struct ext4_dir_entry_2 *dirent);
1972extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1973extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1974 struct buffer_head *bh,
1975 void *buf, int buf_size,
1976 const char *name, int namelen,
1977 struct ext4_dir_entry_2 **dest_de);
1978void ext4_insert_dentry(struct inode *inode,
1979 struct ext4_dir_entry_2 *de,
1980 int buf_size,
1981 const char *name, int namelen);
1982static inline void ext4_update_dx_flag(struct inode *inode)
1983{
1984 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
1985 EXT4_FEATURE_COMPAT_DIR_INDEX))
1986 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
1987}
1988static unsigned char ext4_filetype_table[] = {
1989 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1990};
1991
1992static inline unsigned char get_dtype(struct super_block *sb, int filetype)
1993{
1994 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
1995 (filetype >= EXT4_FT_MAX))
1996 return DT_UNKNOWN;
1997
1998 return ext4_filetype_table[filetype];
1999}
2000
2001
2002extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2003extern int ext4_flush_unwritten_io(struct inode *);
2004
2005
2006extern int ext4fs_dirhash(const char *name, int len, struct
2007 dx_hash_info *hinfo);
2008
2009
2010extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
2011 const struct qstr *qstr, __u32 goal,
2012 uid_t *owner);
2013extern void ext4_free_inode(handle_t *, struct inode *);
2014extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2015extern unsigned long ext4_count_free_inodes(struct super_block *);
2016extern unsigned long ext4_count_dirs(struct super_block *);
2017extern void ext4_check_inodes_bitmap(struct super_block *);
2018extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2019extern int ext4_init_inode_table(struct super_block *sb,
2020 ext4_group_t group, int barrier);
2021extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2022
2023
2024extern long ext4_mb_stats;
2025extern long ext4_mb_max_to_scan;
2026extern int ext4_mb_init(struct super_block *);
2027extern int ext4_mb_release(struct super_block *);
2028extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2029 struct ext4_allocation_request *, int *);
2030extern int ext4_mb_reserve_blocks(struct super_block *, int);
2031extern void ext4_discard_preallocations(struct inode *);
2032extern int __init ext4_init_mballoc(void);
2033extern void ext4_exit_mballoc(void);
2034extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2035 struct buffer_head *bh, ext4_fsblk_t block,
2036 unsigned long count, int flags);
2037extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2038 ext4_group_t ngroups);
2039extern int ext4_mb_add_groupinfo(struct super_block *sb,
2040 ext4_group_t i, struct ext4_group_desc *desc);
2041extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2042 ext4_fsblk_t block, unsigned long count);
2043extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2044
2045
2046struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2047 ext4_lblk_t, int, int *);
2048struct buffer_head *ext4_bread(handle_t *, struct inode *,
2049 ext4_lblk_t, int, int *);
2050int ext4_get_block_write(struct inode *inode, sector_t iblock,
2051 struct buffer_head *bh_result, int create);
2052int ext4_get_block(struct inode *inode, sector_t iblock,
2053 struct buffer_head *bh_result, int create);
2054int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2055 struct buffer_head *bh, int create);
2056int ext4_walk_page_buffers(handle_t *handle,
2057 struct buffer_head *head,
2058 unsigned from,
2059 unsigned to,
2060 int *partial,
2061 int (*fn)(handle_t *handle,
2062 struct buffer_head *bh));
2063int do_journal_get_write_access(handle_t *handle,
2064 struct buffer_head *bh);
2065#define FALL_BACK_TO_NONDELALLOC 1
2066#define CONVERT_INLINE_DATA 2
2067
2068extern struct inode *ext4_iget(struct super_block *, unsigned long);
2069extern int ext4_write_inode(struct inode *, struct writeback_control *);
2070extern int ext4_setattr(struct dentry *, struct iattr *);
2071extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2072 struct kstat *stat);
2073extern void ext4_evict_inode(struct inode *);
2074extern void ext4_clear_inode(struct inode *);
2075extern int ext4_sync_inode(handle_t *, struct inode *);
2076extern void ext4_dirty_inode(struct inode *, int);
2077extern int ext4_change_inode_journal_flag(struct inode *, int);
2078extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2079extern int ext4_can_truncate(struct inode *inode);
2080extern void ext4_truncate(struct inode *);
2081extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2082extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2083extern void ext4_set_inode_flags(struct inode *);
2084extern void ext4_get_inode_flags(struct ext4_inode_info *);
2085extern int ext4_alloc_da_blocks(struct inode *inode);
2086extern void ext4_set_aops(struct inode *inode);
2087extern int ext4_writepage_trans_blocks(struct inode *);
2088extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2089extern int ext4_discard_partial_page_buffers(handle_t *handle,
2090 struct address_space *mapping, loff_t from,
2091 loff_t length, int flags);
2092extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2093extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2094extern void ext4_da_update_reserve_space(struct inode *inode,
2095 int used, int quota_claim);
2096
2097
2098extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2099 struct ext4_map_blocks *map, int flags);
2100extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2101 const struct iovec *iov, loff_t offset,
2102 unsigned long nr_segs);
2103extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2104extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
2105extern void ext4_ind_truncate(struct inode *inode);
2106
2107
2108extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2109extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2110
2111
2112extern int ext4_ext_migrate(struct inode *);
2113
2114
2115extern int ext4_dirent_csum_verify(struct inode *inode,
2116 struct ext4_dir_entry *dirent);
2117extern int ext4_orphan_add(handle_t *, struct inode *);
2118extern int ext4_orphan_del(handle_t *, struct inode *);
2119extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2120 __u32 start_minor_hash, __u32 *next_hash);
2121extern int search_dir(struct buffer_head *bh,
2122 char *search_buf,
2123 int buf_size,
2124 struct inode *dir,
2125 const struct qstr *d_name,
2126 unsigned int offset,
2127 struct ext4_dir_entry_2 **res_dir);
2128extern int ext4_generic_delete_entry(handle_t *handle,
2129 struct inode *dir,
2130 struct ext4_dir_entry_2 *de_del,
2131 struct buffer_head *bh,
2132 void *entry_buf,
2133 int buf_size,
2134 int csum_size);
2135
2136
2137extern int ext4_group_add(struct super_block *sb,
2138 struct ext4_new_group_data *input);
2139extern int ext4_group_extend(struct super_block *sb,
2140 struct ext4_super_block *es,
2141 ext4_fsblk_t n_blocks_count);
2142extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2143
2144
2145extern int ext4_calculate_overhead(struct super_block *sb);
2146extern int ext4_superblock_csum_verify(struct super_block *sb,
2147 struct ext4_super_block *es);
2148extern void ext4_superblock_csum_set(struct super_block *sb);
2149extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2150extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2151extern void ext4_kvfree(void *ptr);
2152extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2153 ext4_group_t ngroup);
2154extern __printf(4, 5)
2155void __ext4_error(struct super_block *, const char *, unsigned int,
2156 const char *, ...);
2157#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2158 __LINE__, ## message)
2159extern __printf(5, 6)
2160void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2161 const char *, ...);
2162extern __printf(5, 6)
2163void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2164 const char *, ...);
2165extern void __ext4_std_error(struct super_block *, const char *,
2166 unsigned int, int);
2167extern __printf(4, 5)
2168void __ext4_abort(struct super_block *, const char *, unsigned int,
2169 const char *, ...);
2170#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2171 __LINE__, ## message)
2172extern __printf(4, 5)
2173void __ext4_warning(struct super_block *, const char *, unsigned int,
2174 const char *, ...);
2175#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2176 __LINE__, ## message)
2177extern __printf(3, 4)
2178void ext4_msg(struct super_block *, const char *, const char *, ...);
2179extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2180 const char *, unsigned int, const char *);
2181#define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2182 __LINE__, msg)
2183extern __printf(7, 8)
2184void __ext4_grp_locked_error(const char *, unsigned int,
2185 struct super_block *, ext4_group_t,
2186 unsigned long, ext4_fsblk_t,
2187 const char *, ...);
2188#define ext4_grp_locked_error(sb, grp, message...) \
2189 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2190extern void ext4_update_dynamic_rev(struct super_block *sb);
2191extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2192 __u32 compat);
2193extern int ext4_update_rocompat_feature(handle_t *handle,
2194 struct super_block *sb, __u32 rocompat);
2195extern int ext4_update_incompat_feature(handle_t *handle,
2196 struct super_block *sb, __u32 incompat);
2197extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2198 struct ext4_group_desc *bg);
2199extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2200 struct ext4_group_desc *bg);
2201extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2202 struct ext4_group_desc *bg);
2203extern __u32 ext4_free_group_clusters(struct super_block *sb,
2204 struct ext4_group_desc *bg);
2205extern __u32 ext4_free_inodes_count(struct super_block *sb,
2206 struct ext4_group_desc *bg);
2207extern __u32 ext4_used_dirs_count(struct super_block *sb,
2208 struct ext4_group_desc *bg);
2209extern __u32 ext4_itable_unused_count(struct super_block *sb,
2210 struct ext4_group_desc *bg);
2211extern void ext4_block_bitmap_set(struct super_block *sb,
2212 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2213extern void ext4_inode_bitmap_set(struct super_block *sb,
2214 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2215extern void ext4_inode_table_set(struct super_block *sb,
2216 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2217extern void ext4_free_group_clusters_set(struct super_block *sb,
2218 struct ext4_group_desc *bg,
2219 __u32 count);
2220extern void ext4_free_inodes_set(struct super_block *sb,
2221 struct ext4_group_desc *bg, __u32 count);
2222extern void ext4_used_dirs_set(struct super_block *sb,
2223 struct ext4_group_desc *bg, __u32 count);
2224extern void ext4_itable_unused_set(struct super_block *sb,
2225 struct ext4_group_desc *bg, __u32 count);
2226extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2227 struct ext4_group_desc *gdp);
2228extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2229 struct ext4_group_desc *gdp);
2230
2231static inline int ext4_has_group_desc_csum(struct super_block *sb)
2232{
2233 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2234 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2235 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2236}
2237
2238static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2239{
2240 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2241 le32_to_cpu(es->s_blocks_count_lo);
2242}
2243
2244static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2245{
2246 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2247 le32_to_cpu(es->s_r_blocks_count_lo);
2248}
2249
2250static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2251{
2252 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2253 le32_to_cpu(es->s_free_blocks_count_lo);
2254}
2255
2256static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2257 ext4_fsblk_t blk)
2258{
2259 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2260 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2261}
2262
2263static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2264 ext4_fsblk_t blk)
2265{
2266 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2267 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2268}
2269
2270static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2271 ext4_fsblk_t blk)
2272{
2273 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2274 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2275}
2276
2277static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2278{
2279 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2280 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2281 le32_to_cpu(raw_inode->i_size_lo);
2282 else
2283 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2284}
2285
2286static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2287{
2288 raw_inode->i_size_lo = cpu_to_le32(i_size);
2289 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2290}
2291
2292static inline
2293struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2294 ext4_group_t group)
2295{
2296 struct ext4_group_info ***grp_info;
2297 long indexv, indexh;
2298 grp_info = EXT4_SB(sb)->s_group_info;
2299 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2300 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2301 return grp_info[indexv][indexh];
2302}
2303
2304
2305
2306
2307
2308
2309static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2310{
2311 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2312
2313 smp_rmb();
2314 return ngroups;
2315}
2316
2317static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2318 ext4_group_t block_group)
2319{
2320 return block_group >> sbi->s_log_groups_per_flex;
2321}
2322
2323static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2324{
2325 return 1 << sbi->s_log_groups_per_flex;
2326}
2327
2328#define ext4_std_error(sb, errno) \
2329do { \
2330 if ((errno)) \
2331 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2332} while (0)
2333
2334#ifdef CONFIG_SMP
2335
2336
2337
2338
2339#define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2340#else
2341#define EXT4_FREECLUSTERS_WATERMARK 0
2342#endif
2343
2344static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2345{
2346
2347
2348
2349 down_write(&EXT4_I(inode)->i_data_sem);
2350 if (newsize > EXT4_I(inode)->i_disksize)
2351 EXT4_I(inode)->i_disksize = newsize;
2352 up_write(&EXT4_I(inode)->i_data_sem);
2353 return ;
2354}
2355
2356struct ext4_group_info {
2357 unsigned long bb_state;
2358 struct rb_root bb_free_root;
2359 ext4_grpblk_t bb_first_free;
2360 ext4_grpblk_t bb_free;
2361 ext4_grpblk_t bb_fragments;
2362 ext4_grpblk_t bb_largest_free_order;
2363 struct list_head bb_prealloc_list;
2364#ifdef DOUBLE_CHECK
2365 void *bb_bitmap;
2366#endif
2367 struct rw_semaphore alloc_sem;
2368 ext4_grpblk_t bb_counters[];
2369
2370
2371
2372};
2373
2374#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2375#define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2376
2377#define EXT4_MB_GRP_NEED_INIT(grp) \
2378 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2379
2380#define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2381 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2382#define EXT4_MB_GRP_SET_TRIMMED(grp) \
2383 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2384#define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2385 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2386
2387#define EXT4_MAX_CONTENTION 8
2388#define EXT4_CONTENTION_THRESHOLD 2
2389
2390static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2391 ext4_group_t group)
2392{
2393 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2394}
2395
2396
2397
2398
2399
2400static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2401{
2402 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2403}
2404
2405static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2406{
2407 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2408 if (spin_trylock(lock))
2409
2410
2411
2412
2413 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2414 else {
2415
2416
2417
2418
2419 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2420 EXT4_MAX_CONTENTION);
2421 spin_lock(lock);
2422 }
2423}
2424
2425static inline void ext4_unlock_group(struct super_block *sb,
2426 ext4_group_t group)
2427{
2428 spin_unlock(ext4_group_lock_ptr(sb, group));
2429}
2430
2431
2432
2433
2434#define ext4_check_indirect_blockref(inode, bh) \
2435 ext4_check_blockref(__func__, __LINE__, inode, \
2436 (__le32 *)(bh)->b_data, \
2437 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2438
2439#define ext4_ind_check_inode(inode) \
2440 ext4_check_blockref(__func__, __LINE__, inode, \
2441 EXT4_I(inode)->i_data, \
2442 EXT4_NDIR_BLOCKS)
2443
2444
2445
2446
2447
2448
2449extern const struct file_operations ext4_dir_operations;
2450
2451
2452extern const struct inode_operations ext4_file_inode_operations;
2453extern const struct file_operations ext4_file_operations;
2454extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2455extern void ext4_unwritten_wait(struct inode *inode);
2456
2457
2458extern const struct inode_operations ext4_dir_inode_operations;
2459extern const struct inode_operations ext4_special_inode_operations;
2460extern struct dentry *ext4_get_parent(struct dentry *child);
2461extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2462 struct ext4_dir_entry_2 *de,
2463 int blocksize, int csum_size,
2464 unsigned int parent_ino, int dotdot_real_len);
2465extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2466 unsigned int blocksize);
2467extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2468 struct inode *inode,
2469 struct buffer_head *bh);
2470
2471
2472extern const struct inode_operations ext4_symlink_inode_operations;
2473extern const struct inode_operations ext4_fast_symlink_inode_operations;
2474
2475
2476extern void ext4_release_system_zone(struct super_block *sb);
2477extern int ext4_setup_system_zone(struct super_block *sb);
2478extern int __init ext4_init_system_zone(void);
2479extern void ext4_exit_system_zone(void);
2480extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2481 ext4_fsblk_t start_blk,
2482 unsigned int count);
2483extern int ext4_check_blockref(const char *, unsigned int,
2484 struct inode *, __le32 *, unsigned int);
2485
2486
2487struct ext4_ext_path;
2488struct ext4_extent;
2489
2490extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2491extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2492extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2493 int chunk);
2494extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2495 struct ext4_map_blocks *map, int flags);
2496extern void ext4_ext_truncate(struct inode *);
2497extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2498 loff_t length);
2499extern void ext4_ext_init(struct super_block *);
2500extern void ext4_ext_release(struct super_block *);
2501extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2502 loff_t len);
2503extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2504 ssize_t len);
2505extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2506 struct ext4_map_blocks *map, int flags);
2507extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2508 ext4_lblk_t lblocks);
2509extern int ext4_extent_tree_init(handle_t *, struct inode *);
2510extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2511 int num,
2512 struct ext4_ext_path *path);
2513extern int ext4_can_extents_be_merged(struct inode *inode,
2514 struct ext4_extent *ex1,
2515 struct ext4_extent *ex2);
2516extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2517 struct ext4_ext_path *,
2518 struct ext4_extent *, int);
2519extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2520 struct ext4_ext_path *);
2521extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2522extern int ext4_ext_check_inode(struct inode *inode);
2523extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2524extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2525 __u64 start, __u64 len);
2526
2527
2528
2529extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2530 __u64 start_orig, __u64 start_donor,
2531 __u64 len, __u64 *moved_len);
2532
2533
2534extern int __init ext4_init_pageio(void);
2535extern void ext4_add_complete_io(ext4_io_end_t *io_end);
2536extern void ext4_exit_pageio(void);
2537extern void ext4_ioend_wait(struct inode *);
2538extern void ext4_free_io_end(ext4_io_end_t *io);
2539extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2540extern void ext4_io_submit(struct ext4_io_submit *io);
2541extern int ext4_bio_write_page(struct ext4_io_submit *io,
2542 struct page *page,
2543 int len,
2544 struct writeback_control *wbc);
2545
2546
2547extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2548extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2549extern int ext4_mmp_csum_verify(struct super_block *sb,
2550 struct mmp_struct *mmp);
2551
2552
2553enum ext4_state_bits {
2554 BH_Uninit
2555 = BH_JBDPrivateStart,
2556 BH_AllocFromCluster,
2557
2558
2559
2560
2561};
2562
2563BUFFER_FNS(Uninit, uninit)
2564TAS_BUFFER_FNS(Uninit, uninit)
2565
2566
2567
2568
2569
2570
2571#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2572
2573static inline int bitmap_uptodate(struct buffer_head *bh)
2574{
2575 return (buffer_uptodate(bh) &&
2576 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2577}
2578static inline void set_bitmap_uptodate(struct buffer_head *bh)
2579{
2580 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2581}
2582
2583
2584
2585
2586
2587static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2588{
2589 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2590 smp_mb();
2591}
2592static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2593{
2594 smp_mb();
2595 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2596}
2597
2598#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2599
2600
2601#define EXT4_WQ_HASH_SZ 37
2602#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2603 EXT4_WQ_HASH_SZ])
2604#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2605 EXT4_WQ_HASH_SZ])
2606extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2607extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2608
2609#define EXT4_RESIZING 0
2610extern int ext4_resize_begin(struct super_block *sb);
2611extern void ext4_resize_end(struct super_block *sb);
2612
2613#endif
2614
2615#endif
2616