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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
33
34
35
36
37
38
39
40#undef EXT4FS_DEBUG
41
42
43
44
45#ifdef EXT4FS_DEBUG
46#define ext4_debug(f, a...) \
47 do { \
48 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __func__); \
50 printk(KERN_DEBUG f, ## a); \
51 } while (0)
52#else
53#define ext4_debug(f, a...) do {} while (0)
54#endif
55
56
57typedef int ext4_grpblk_t;
58
59
60typedef unsigned long long ext4_fsblk_t;
61
62
63typedef __u32 ext4_lblk_t;
64
65
66typedef unsigned int ext4_group_t;
67
68
69
70
71
72
73
74
75
76#define EXT4_MB_HINT_MERGE 0x0001
77
78#define EXT4_MB_HINT_RESERVED 0x0002
79
80#define EXT4_MB_HINT_METADATA 0x0004
81
82#define EXT4_MB_HINT_FIRST 0x0008
83
84#define EXT4_MB_HINT_BEST 0x0010
85
86#define EXT4_MB_HINT_DATA 0x0020
87
88#define EXT4_MB_HINT_NOPREALLOC 0x0040
89
90#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
91
92#define EXT4_MB_HINT_GOAL_ONLY 0x0100
93
94#define EXT4_MB_HINT_TRY_GOAL 0x0200
95
96#define EXT4_MB_DELALLOC_RESERVED 0x0400
97
98#define EXT4_MB_STREAM_ALLOC 0x0800
99
100
101struct ext4_allocation_request {
102
103 struct inode *inode;
104
105 unsigned int len;
106
107 ext4_lblk_t logical;
108
109 ext4_lblk_t lleft;
110
111 ext4_lblk_t lright;
112
113 ext4_fsblk_t goal;
114
115 ext4_fsblk_t pleft;
116
117 ext4_fsblk_t pright;
118
119 unsigned int flags;
120};
121
122
123
124
125struct mpage_da_data {
126 struct inode *inode;
127 sector_t b_blocknr;
128 size_t b_size;
129 unsigned long b_state;
130 unsigned long first_page, next_page;
131 struct writeback_control *wbc;
132 int io_done;
133 int pages_written;
134 int retval;
135};
136#define DIO_AIO_UNWRITTEN 0x1
137typedef struct ext4_io_end {
138 struct list_head list;
139 struct inode *inode;
140 unsigned int flag;
141 int error;
142 ext4_lblk_t offset;
143 size_t size;
144 struct work_struct work;
145} ext4_io_end_t;
146
147
148
149
150#define EXT4_BAD_INO 1
151#define EXT4_ROOT_INO 2
152#define EXT4_BOOT_LOADER_INO 5
153#define EXT4_UNDEL_DIR_INO 6
154#define EXT4_RESIZE_INO 7
155#define EXT4_JOURNAL_INO 8
156
157
158#define EXT4_GOOD_OLD_FIRST_INO 11
159
160
161
162
163#define EXT4_LINK_MAX 65000
164
165
166
167
168#define EXT4_MIN_BLOCK_SIZE 1024
169#define EXT4_MAX_BLOCK_SIZE 65536
170#define EXT4_MIN_BLOCK_LOG_SIZE 10
171#ifdef __KERNEL__
172# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
173#else
174# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
175#endif
176#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
177#ifdef __KERNEL__
178# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
179#else
180# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
181#endif
182#ifdef __KERNEL__
183#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
184#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
185#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
186#else
187#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
188 EXT4_GOOD_OLD_INODE_SIZE : \
189 (s)->s_inode_size)
190#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
191 EXT4_GOOD_OLD_FIRST_INO : \
192 (s)->s_first_ino)
193#endif
194#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
195
196
197
198
199struct ext4_group_desc
200{
201 __le32 bg_block_bitmap_lo;
202 __le32 bg_inode_bitmap_lo;
203 __le32 bg_inode_table_lo;
204 __le16 bg_free_blocks_count_lo;
205 __le16 bg_free_inodes_count_lo;
206 __le16 bg_used_dirs_count_lo;
207 __le16 bg_flags;
208 __u32 bg_reserved[2];
209 __le16 bg_itable_unused_lo;
210 __le16 bg_checksum;
211 __le32 bg_block_bitmap_hi;
212 __le32 bg_inode_bitmap_hi;
213 __le32 bg_inode_table_hi;
214 __le16 bg_free_blocks_count_hi;
215 __le16 bg_free_inodes_count_hi;
216 __le16 bg_used_dirs_count_hi;
217 __le16 bg_itable_unused_hi;
218 __u32 bg_reserved2[3];
219};
220
221
222
223
224
225struct flex_groups {
226 atomic_t free_inodes;
227 atomic_t free_blocks;
228 atomic_t used_dirs;
229};
230
231#define EXT4_BG_INODE_UNINIT 0x0001
232#define EXT4_BG_BLOCK_UNINIT 0x0002
233#define EXT4_BG_INODE_ZEROED 0x0004
234
235
236
237
238#define EXT4_MIN_DESC_SIZE 32
239#define EXT4_MIN_DESC_SIZE_64BIT 64
240#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
241#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
242#ifdef __KERNEL__
243# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
244# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
245# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
246# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
247#else
248# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
249# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
250# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
251#endif
252
253
254
255
256#define EXT4_NDIR_BLOCKS 12
257#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
258#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
259#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
260#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
261
262
263
264
265#define EXT4_SECRM_FL 0x00000001
266#define EXT4_UNRM_FL 0x00000002
267#define EXT4_COMPR_FL 0x00000004
268#define EXT4_SYNC_FL 0x00000008
269#define EXT4_IMMUTABLE_FL 0x00000010
270#define EXT4_APPEND_FL 0x00000020
271#define EXT4_NODUMP_FL 0x00000040
272#define EXT4_NOATIME_FL 0x00000080
273
274#define EXT4_DIRTY_FL 0x00000100
275#define EXT4_COMPRBLK_FL 0x00000200
276#define EXT4_NOCOMPR_FL 0x00000400
277#define EXT4_ECOMPR_FL 0x00000800
278
279#define EXT4_INDEX_FL 0x00001000
280#define EXT4_IMAGIC_FL 0x00002000
281#define EXT4_JOURNAL_DATA_FL 0x00004000
282#define EXT4_NOTAIL_FL 0x00008000
283#define EXT4_DIRSYNC_FL 0x00010000
284#define EXT4_TOPDIR_FL 0x00020000
285#define EXT4_HUGE_FILE_FL 0x00040000
286#define EXT4_EXTENTS_FL 0x00080000
287#define EXT4_RESERVED_FL 0x80000000
288
289#define EXT4_FL_USER_VISIBLE 0x000BDFFF
290#define EXT4_FL_USER_MODIFIABLE 0x000B80FF
291
292
293#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
294 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
295 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
296 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
297 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
298
299
300#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
301
302
303#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
304
305
306static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
307{
308 if (S_ISDIR(mode))
309 return flags;
310 else if (S_ISREG(mode))
311 return flags & EXT4_REG_FLMASK;
312 else
313 return flags & EXT4_OTHER_FLMASK;
314}
315
316
317
318
319#define EXT4_STATE_JDATA 0x00000001
320#define EXT4_STATE_NEW 0x00000002
321#define EXT4_STATE_XATTR 0x00000004
322#define EXT4_STATE_NO_EXPAND 0x00000008
323#define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010
324#define EXT4_STATE_EXT_MIGRATE 0x00000020
325#define EXT4_STATE_DIO_UNWRITTEN 0x00000040
326
327
328struct ext4_new_group_input {
329 __u32 group;
330 __u64 block_bitmap;
331 __u64 inode_bitmap;
332 __u64 inode_table;
333 __u32 blocks_count;
334 __u16 reserved_blocks;
335 __u16 unused;
336};
337
338
339struct ext4_new_group_data {
340 __u32 group;
341 __u64 block_bitmap;
342 __u64 inode_bitmap;
343 __u64 inode_table;
344 __u32 blocks_count;
345 __u16 reserved_blocks;
346 __u16 unused;
347 __u32 free_blocks_count;
348};
349
350
351
352
353
354
355#define EXT4_GET_BLOCKS_CREATE 0x0001
356
357#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
358#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
359 EXT4_GET_BLOCKS_CREATE)
360
361
362
363#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
364
365
366#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
367
368
369
370#define EXT4_GET_BLOCKS_DIO 0x0010
371#define EXT4_GET_BLOCKS_CONVERT 0x0020
372#define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\
373 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
374
375#define EXT4_GET_BLOCKS_DIO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
376 EXT4_GET_BLOCKS_DIO_CREATE_EXT)
377
378
379
380
381#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
382#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
383#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
384#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
385#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
386#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
387#ifdef CONFIG_JBD2_DEBUG
388#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
389#endif
390#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
391#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
392#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
393#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
394#define EXT4_IOC_MIGRATE _IO('f', 9)
395
396
397#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
398#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
399
400
401
402
403#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
404#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
405#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
406#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
407#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
408#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
409#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
410#ifdef CONFIG_JBD2_DEBUG
411#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
412#endif
413#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
414#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
415
416
417
418
419
420struct ext4_mount_options {
421 unsigned long s_mount_opt;
422 uid_t s_resuid;
423 gid_t s_resgid;
424 unsigned long s_commit_interval;
425 u32 s_min_batch_time, s_max_batch_time;
426#ifdef CONFIG_QUOTA
427 int s_jquota_fmt;
428 char *s_qf_names[MAXQUOTAS];
429#endif
430};
431
432
433#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
434
435
436
437
438struct ext4_inode {
439 __le16 i_mode;
440 __le16 i_uid;
441 __le32 i_size_lo;
442 __le32 i_atime;
443 __le32 i_ctime;
444 __le32 i_mtime;
445 __le32 i_dtime;
446 __le16 i_gid;
447 __le16 i_links_count;
448 __le32 i_blocks_lo;
449 __le32 i_flags;
450 union {
451 struct {
452 __le32 l_i_version;
453 } linux1;
454 struct {
455 __u32 h_i_translator;
456 } hurd1;
457 struct {
458 __u32 m_i_reserved1;
459 } masix1;
460 } osd1;
461 __le32 i_block[EXT4_N_BLOCKS];
462 __le32 i_generation;
463 __le32 i_file_acl_lo;
464 __le32 i_size_high;
465 __le32 i_obso_faddr;
466 union {
467 struct {
468 __le16 l_i_blocks_high;
469 __le16 l_i_file_acl_high;
470 __le16 l_i_uid_high;
471 __le16 l_i_gid_high;
472 __u32 l_i_reserved2;
473 } linux2;
474 struct {
475 __le16 h_i_reserved1;
476 __u16 h_i_mode_high;
477 __u16 h_i_uid_high;
478 __u16 h_i_gid_high;
479 __u32 h_i_author;
480 } hurd2;
481 struct {
482 __le16 h_i_reserved1;
483 __le16 m_i_file_acl_high;
484 __u32 m_i_reserved2[2];
485 } masix2;
486 } osd2;
487 __le16 i_extra_isize;
488 __le16 i_pad1;
489 __le32 i_ctime_extra;
490 __le32 i_mtime_extra;
491 __le32 i_atime_extra;
492 __le32 i_crtime;
493 __le32 i_crtime_extra;
494 __le32 i_version_hi;
495};
496
497struct move_extent {
498 __u32 reserved;
499 __u32 donor_fd;
500 __u64 orig_start;
501 __u64 donor_start;
502 __u64 len;
503 __u64 moved_len;
504};
505
506#define EXT4_EPOCH_BITS 2
507#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
508#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
509
510
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515
516
517
518
519
520#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
521 ((offsetof(typeof(*ext4_inode), field) + \
522 sizeof((ext4_inode)->field)) \
523 <= (EXT4_GOOD_OLD_INODE_SIZE + \
524 (einode)->i_extra_isize)) \
525
526static inline __le32 ext4_encode_extra_time(struct timespec *time)
527{
528 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
529 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
530 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
531}
532
533static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
534{
535 if (sizeof(time->tv_sec) > 4)
536 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
537 << 32;
538 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
539}
540
541#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
542do { \
543 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
544 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
545 (raw_inode)->xtime ## _extra = \
546 ext4_encode_extra_time(&(inode)->xtime); \
547} while (0)
548
549#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
550do { \
551 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
552 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
553 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
554 (raw_inode)->xtime ## _extra = \
555 ext4_encode_extra_time(&(einode)->xtime); \
556} while (0)
557
558#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
559do { \
560 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
561 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
562 ext4_decode_extra_time(&(inode)->xtime, \
563 raw_inode->xtime ## _extra); \
564} while (0)
565
566#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
567do { \
568 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
569 (einode)->xtime.tv_sec = \
570 (signed)le32_to_cpu((raw_inode)->xtime); \
571 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
572 ext4_decode_extra_time(&(einode)->xtime, \
573 raw_inode->xtime ## _extra); \
574} while (0)
575
576#define i_disk_version osd1.linux1.l_i_version
577
578#if defined(__KERNEL__) || defined(__linux__)
579#define i_reserved1 osd1.linux1.l_i_reserved1
580#define i_file_acl_high osd2.linux2.l_i_file_acl_high
581#define i_blocks_high osd2.linux2.l_i_blocks_high
582#define i_uid_low i_uid
583#define i_gid_low i_gid
584#define i_uid_high osd2.linux2.l_i_uid_high
585#define i_gid_high osd2.linux2.l_i_gid_high
586#define i_reserved2 osd2.linux2.l_i_reserved2
587
588#elif defined(__GNU__)
589
590#define i_translator osd1.hurd1.h_i_translator
591#define i_uid_high osd2.hurd2.h_i_uid_high
592#define i_gid_high osd2.hurd2.h_i_gid_high
593#define i_author osd2.hurd2.h_i_author
594
595#elif defined(__masix__)
596
597#define i_reserved1 osd1.masix1.m_i_reserved1
598#define i_file_acl_high osd2.masix2.m_i_file_acl_high
599#define i_reserved2 osd2.masix2.m_i_reserved2
600
601#endif
602
603
604
605
606struct ext4_ext_cache {
607 ext4_fsblk_t ec_start;
608 ext4_lblk_t ec_block;
609 __u32 ec_len;
610 __u32 ec_type;
611};
612
613
614
615
616struct ext4_inode_info {
617 __le32 i_data[15];
618 __u32 i_flags;
619 ext4_fsblk_t i_file_acl;
620 __u32 i_dtime;
621
622
623
624
625
626
627
628
629 ext4_group_t i_block_group;
630 __u32 i_state;
631
632 ext4_lblk_t i_dir_start_lookup;
633#ifdef CONFIG_EXT4_FS_XATTR
634
635
636
637
638
639
640
641 struct rw_semaphore xattr_sem;
642#endif
643
644 struct list_head i_orphan;
645
646
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654
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657
658
659
660
661 loff_t i_disksize;
662
663
664
665
666
667
668
669
670
671
672
673 struct rw_semaphore i_data_sem;
674 struct inode vfs_inode;
675 struct jbd2_inode jinode;
676
677 struct ext4_ext_cache i_cached_extent;
678
679
680
681
682 struct timespec i_crtime;
683
684
685 struct list_head i_prealloc_list;
686 spinlock_t i_prealloc_lock;
687
688
689 ext4_group_t i_last_alloc_group;
690
691
692 unsigned int i_reserved_data_blocks;
693 unsigned int i_reserved_meta_blocks;
694 unsigned int i_allocated_meta_blocks;
695 unsigned short i_delalloc_reserved_flag;
696
697
698 __u16 i_extra_isize;
699
700 spinlock_t i_block_reservation_lock;
701
702
703 struct list_head i_aio_dio_complete_list;
704
705 ext4_io_end_t *cur_aio_dio;
706};
707
708
709
710
711#define EXT4_VALID_FS 0x0001
712#define EXT4_ERROR_FS 0x0002
713#define EXT4_ORPHAN_FS 0x0004
714
715
716
717
718#define EXT2_FLAGS_SIGNED_HASH 0x0001
719#define EXT2_FLAGS_UNSIGNED_HASH 0x0002
720#define EXT2_FLAGS_TEST_FILESYS 0x0004
721
722
723
724
725#define EXT4_MOUNT_OLDALLOC 0x00002
726#define EXT4_MOUNT_GRPID 0x00004
727#define EXT4_MOUNT_DEBUG 0x00008
728#define EXT4_MOUNT_ERRORS_CONT 0x00010
729#define EXT4_MOUNT_ERRORS_RO 0x00020
730#define EXT4_MOUNT_ERRORS_PANIC 0x00040
731#define EXT4_MOUNT_MINIX_DF 0x00080
732#define EXT4_MOUNT_NOLOAD 0x00100
733#define EXT4_MOUNT_DATA_FLAGS 0x00C00
734#define EXT4_MOUNT_JOURNAL_DATA 0x00400
735#define EXT4_MOUNT_ORDERED_DATA 0x00800
736#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00
737#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000
738#define EXT4_MOUNT_NO_UID32 0x02000
739#define EXT4_MOUNT_XATTR_USER 0x04000
740#define EXT4_MOUNT_POSIX_ACL 0x08000
741#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000
742#define EXT4_MOUNT_BARRIER 0x20000
743#define EXT4_MOUNT_NOBH 0x40000
744#define EXT4_MOUNT_QUOTA 0x80000
745#define EXT4_MOUNT_USRQUOTA 0x100000
746#define EXT4_MOUNT_GRPQUOTA 0x200000
747#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000
748#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000
749#define EXT4_MOUNT_I_VERSION 0x2000000
750#define EXT4_MOUNT_DELALLOC 0x8000000
751#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000
752#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000
753
754#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
755#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
756#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
757 EXT4_MOUNT_##opt)
758
759#define ext4_set_bit ext2_set_bit
760#define ext4_set_bit_atomic ext2_set_bit_atomic
761#define ext4_clear_bit ext2_clear_bit
762#define ext4_clear_bit_atomic ext2_clear_bit_atomic
763#define ext4_test_bit ext2_test_bit
764#define ext4_find_first_zero_bit ext2_find_first_zero_bit
765#define ext4_find_next_zero_bit ext2_find_next_zero_bit
766#define ext4_find_next_bit ext2_find_next_bit
767
768
769
770
771#define EXT4_DFL_MAX_MNT_COUNT 20
772#define EXT4_DFL_CHECKINTERVAL 0
773
774
775
776
777#define EXT4_ERRORS_CONTINUE 1
778#define EXT4_ERRORS_RO 2
779#define EXT4_ERRORS_PANIC 3
780#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
781
782
783
784
785struct ext4_super_block {
786 __le32 s_inodes_count;
787 __le32 s_blocks_count_lo;
788 __le32 s_r_blocks_count_lo;
789 __le32 s_free_blocks_count_lo;
790 __le32 s_free_inodes_count;
791 __le32 s_first_data_block;
792 __le32 s_log_block_size;
793 __le32 s_obso_log_frag_size;
794 __le32 s_blocks_per_group;
795 __le32 s_obso_frags_per_group;
796 __le32 s_inodes_per_group;
797 __le32 s_mtime;
798 __le32 s_wtime;
799 __le16 s_mnt_count;
800 __le16 s_max_mnt_count;
801 __le16 s_magic;
802 __le16 s_state;
803 __le16 s_errors;
804 __le16 s_minor_rev_level;
805 __le32 s_lastcheck;
806 __le32 s_checkinterval;
807 __le32 s_creator_os;
808 __le32 s_rev_level;
809 __le16 s_def_resuid;
810 __le16 s_def_resgid;
811
812
813
814
815
816
817
818
819
820
821
822
823
824 __le32 s_first_ino;
825 __le16 s_inode_size;
826 __le16 s_block_group_nr;
827 __le32 s_feature_compat;
828 __le32 s_feature_incompat;
829 __le32 s_feature_ro_compat;
830 __u8 s_uuid[16];
831 char s_volume_name[16];
832 char s_last_mounted[64];
833 __le32 s_algorithm_usage_bitmap;
834
835
836
837
838 __u8 s_prealloc_blocks;
839 __u8 s_prealloc_dir_blocks;
840 __le16 s_reserved_gdt_blocks;
841
842
843
844 __u8 s_journal_uuid[16];
845 __le32 s_journal_inum;
846 __le32 s_journal_dev;
847 __le32 s_last_orphan;
848 __le32 s_hash_seed[4];
849 __u8 s_def_hash_version;
850 __u8 s_reserved_char_pad;
851 __le16 s_desc_size;
852 __le32 s_default_mount_opts;
853 __le32 s_first_meta_bg;
854 __le32 s_mkfs_time;
855 __le32 s_jnl_blocks[17];
856
857 __le32 s_blocks_count_hi;
858 __le32 s_r_blocks_count_hi;
859 __le32 s_free_blocks_count_hi;
860 __le16 s_min_extra_isize;
861 __le16 s_want_extra_isize;
862 __le32 s_flags;
863 __le16 s_raid_stride;
864 __le16 s_mmp_interval;
865 __le64 s_mmp_block;
866 __le32 s_raid_stripe_width;
867 __u8 s_log_groups_per_flex;
868 __u8 s_reserved_char_pad2;
869 __le16 s_reserved_pad;
870 __le64 s_kbytes_written;
871 __u32 s_reserved[160];
872};
873
874#ifdef __KERNEL__
875
876
877
878
879#define EXT4_MF_MNTDIR_SAMPLED 0x0001
880#define EXT4_MF_FS_ABORTED 0x0002
881
882
883
884
885struct ext4_sb_info {
886 unsigned long s_desc_size;
887 unsigned long s_inodes_per_block;
888 unsigned long s_blocks_per_group;
889 unsigned long s_inodes_per_group;
890 unsigned long s_itb_per_group;
891 unsigned long s_gdb_count;
892 unsigned long s_desc_per_block;
893 ext4_group_t s_groups_count;
894 ext4_group_t s_blockfile_groups;
895 unsigned long s_overhead_last;
896 unsigned long s_blocks_last;
897 loff_t s_bitmap_maxbytes;
898 struct buffer_head * s_sbh;
899 struct ext4_super_block *s_es;
900 struct buffer_head **s_group_desc;
901 unsigned int s_mount_opt;
902 unsigned int s_mount_flags;
903 ext4_fsblk_t s_sb_block;
904 uid_t s_resuid;
905 gid_t s_resgid;
906 unsigned short s_mount_state;
907 unsigned short s_pad;
908 int s_addr_per_block_bits;
909 int s_desc_per_block_bits;
910 int s_inode_size;
911 int s_first_ino;
912 unsigned int s_inode_readahead_blks;
913 unsigned int s_inode_goal;
914 spinlock_t s_next_gen_lock;
915 u32 s_next_generation;
916 u32 s_hash_seed[4];
917 int s_def_hash_version;
918 int s_hash_unsigned;
919 struct percpu_counter s_freeblocks_counter;
920 struct percpu_counter s_freeinodes_counter;
921 struct percpu_counter s_dirs_counter;
922 struct percpu_counter s_dirtyblocks_counter;
923 struct blockgroup_lock *s_blockgroup_lock;
924 struct proc_dir_entry *s_proc;
925 struct kobject s_kobj;
926 struct completion s_kobj_unregister;
927
928
929 struct inode *s_journal_inode;
930 struct journal_s *s_journal;
931 struct list_head s_orphan;
932 struct mutex s_orphan_lock;
933 struct mutex s_resize_lock;
934 unsigned long s_commit_interval;
935 u32 s_max_batch_time;
936 u32 s_min_batch_time;
937 struct block_device *journal_bdev;
938#ifdef CONFIG_JBD2_DEBUG
939 struct timer_list turn_ro_timer;
940 wait_queue_head_t ro_wait_queue;
941#endif
942#ifdef CONFIG_QUOTA
943 char *s_qf_names[MAXQUOTAS];
944 int s_jquota_fmt;
945#endif
946 unsigned int s_want_extra_isize;
947 struct rb_root system_blks;
948
949#ifdef EXTENTS_STATS
950
951 unsigned long s_ext_min;
952 unsigned long s_ext_max;
953 unsigned long s_depth_max;
954 spinlock_t s_ext_stats_lock;
955 unsigned long s_ext_blocks;
956 unsigned long s_ext_extents;
957#endif
958
959
960 struct ext4_group_info ***s_group_info;
961 struct inode *s_buddy_cache;
962 long s_blocks_reserved;
963 spinlock_t s_reserve_lock;
964 spinlock_t s_md_lock;
965 tid_t s_last_transaction;
966 unsigned short *s_mb_offsets;
967 unsigned int *s_mb_maxs;
968
969
970 unsigned long s_stripe;
971 unsigned int s_mb_stream_request;
972 unsigned int s_mb_max_to_scan;
973 unsigned int s_mb_min_to_scan;
974 unsigned int s_mb_stats;
975 unsigned int s_mb_order2_reqs;
976 unsigned int s_mb_group_prealloc;
977 unsigned int s_max_writeback_mb_bump;
978
979 unsigned long s_mb_last_group;
980 unsigned long s_mb_last_start;
981
982
983 spinlock_t s_mb_pa_lock;
984 atomic_t s_bal_reqs;
985 atomic_t s_bal_success;
986 atomic_t s_bal_allocated;
987 atomic_t s_bal_ex_scanned;
988 atomic_t s_bal_goals;
989 atomic_t s_bal_breaks;
990 atomic_t s_bal_2orders;
991 spinlock_t s_bal_lock;
992 unsigned long s_mb_buddies_generated;
993 unsigned long long s_mb_generation_time;
994 atomic_t s_mb_lost_chunks;
995 atomic_t s_mb_preallocated;
996 atomic_t s_mb_discarded;
997 atomic_t s_lock_busy;
998
999
1000 struct ext4_locality_group *s_locality_groups;
1001
1002
1003 unsigned long s_sectors_written_start;
1004 u64 s_kbytes_written;
1005
1006 unsigned int s_log_groups_per_flex;
1007 struct flex_groups *s_flex_groups;
1008
1009
1010 struct workqueue_struct *dio_unwritten_wq;
1011};
1012
1013static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1014{
1015 return sb->s_fs_info;
1016}
1017static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1018{
1019 return container_of(inode, struct ext4_inode_info, vfs_inode);
1020}
1021
1022static inline struct timespec ext4_current_time(struct inode *inode)
1023{
1024 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1025 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1026}
1027
1028static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1029{
1030 return ino == EXT4_ROOT_INO ||
1031 ino == EXT4_JOURNAL_INO ||
1032 ino == EXT4_RESIZE_INO ||
1033 (ino >= EXT4_FIRST_INO(sb) &&
1034 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1035}
1036#else
1037
1038
1039
1040#define EXT4_SB(sb) (sb)
1041#endif
1042
1043#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1044
1045
1046
1047
1048#define EXT4_OS_LINUX 0
1049#define EXT4_OS_HURD 1
1050#define EXT4_OS_MASIX 2
1051#define EXT4_OS_FREEBSD 3
1052#define EXT4_OS_LITES 4
1053
1054
1055
1056
1057#define EXT4_GOOD_OLD_REV 0
1058#define EXT4_DYNAMIC_REV 1
1059
1060#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1061#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1062
1063#define EXT4_GOOD_OLD_INODE_SIZE 128
1064
1065
1066
1067
1068
1069#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1070 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1071#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1072 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1073#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1074 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1075#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1076 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1077#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1078 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1079#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1080 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1081#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1082 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1083#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1084 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1085#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1086 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1087
1088#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1089#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1090#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1091#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1092#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1093#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1094
1095#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1096#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1097#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1098#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1099#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1100#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1101#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1102
1103#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1104#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1105#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
1106#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
1107#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1108#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
1109#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1110#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1111#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1112
1113#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1114#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1115 EXT4_FEATURE_INCOMPAT_RECOVER| \
1116 EXT4_FEATURE_INCOMPAT_META_BG| \
1117 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1118 EXT4_FEATURE_INCOMPAT_64BIT| \
1119 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1120#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1121 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1122 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1123 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1124 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1125 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1126 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1127
1128
1129
1130
1131#define EXT4_DEF_RESUID 0
1132#define EXT4_DEF_RESGID 0
1133
1134#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1135
1136
1137
1138
1139#define EXT4_DEFM_DEBUG 0x0001
1140#define EXT4_DEFM_BSDGROUPS 0x0002
1141#define EXT4_DEFM_XATTR_USER 0x0004
1142#define EXT4_DEFM_ACL 0x0008
1143#define EXT4_DEFM_UID16 0x0010
1144#define EXT4_DEFM_JMODE 0x0060
1145#define EXT4_DEFM_JMODE_DATA 0x0020
1146#define EXT4_DEFM_JMODE_ORDERED 0x0040
1147#define EXT4_DEFM_JMODE_WBACK 0x0060
1148
1149
1150
1151
1152#define EXT4_DEF_MIN_BATCH_TIME 0
1153#define EXT4_DEF_MAX_BATCH_TIME 15000
1154
1155
1156
1157
1158
1159#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1160
1161
1162
1163
1164#define EXT4_NAME_LEN 255
1165
1166struct ext4_dir_entry {
1167 __le32 inode;
1168 __le16 rec_len;
1169 __le16 name_len;
1170 char name[EXT4_NAME_LEN];
1171};
1172
1173
1174
1175
1176
1177
1178
1179struct ext4_dir_entry_2 {
1180 __le32 inode;
1181 __le16 rec_len;
1182 __u8 name_len;
1183 __u8 file_type;
1184 char name[EXT4_NAME_LEN];
1185};
1186
1187
1188
1189
1190
1191#define EXT4_FT_UNKNOWN 0
1192#define EXT4_FT_REG_FILE 1
1193#define EXT4_FT_DIR 2
1194#define EXT4_FT_CHRDEV 3
1195#define EXT4_FT_BLKDEV 4
1196#define EXT4_FT_FIFO 5
1197#define EXT4_FT_SOCK 6
1198#define EXT4_FT_SYMLINK 7
1199
1200#define EXT4_FT_MAX 8
1201
1202
1203
1204
1205
1206
1207#define EXT4_DIR_PAD 4
1208#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1209#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1210 ~EXT4_DIR_ROUND)
1211#define EXT4_MAX_REC_LEN ((1<<16)-1)
1212
1213
1214
1215
1216
1217
1218#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1219 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1220 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1221#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1222#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1223
1224
1225
1226#define DX_HASH_LEGACY 0
1227#define DX_HASH_HALF_MD4 1
1228#define DX_HASH_TEA 2
1229#define DX_HASH_LEGACY_UNSIGNED 3
1230#define DX_HASH_HALF_MD4_UNSIGNED 4
1231#define DX_HASH_TEA_UNSIGNED 5
1232
1233#ifdef __KERNEL__
1234
1235
1236struct dx_hash_info
1237{
1238 u32 hash;
1239 u32 minor_hash;
1240 int hash_version;
1241 u32 *seed;
1242};
1243
1244#define EXT4_HTREE_EOF 0x7fffffff
1245
1246
1247
1248
1249#define HASH_NB_ALWAYS 1
1250
1251
1252
1253
1254
1255struct ext4_iloc
1256{
1257 struct buffer_head *bh;
1258 unsigned long offset;
1259 ext4_group_t block_group;
1260};
1261
1262static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1263{
1264 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1265}
1266
1267
1268
1269
1270
1271
1272struct dir_private_info {
1273 struct rb_root root;
1274 struct rb_node *curr_node;
1275 struct fname *extra_fname;
1276 loff_t last_pos;
1277 __u32 curr_hash;
1278 __u32 curr_minor_hash;
1279 __u32 next_hash;
1280};
1281
1282
1283static inline ext4_fsblk_t
1284ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1285{
1286 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1287 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1288}
1289
1290
1291
1292
1293#define ERR_BAD_DX_DIR -75000
1294
1295void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1296 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1297
1298extern struct proc_dir_entry *ext4_proc_root;
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308# define NORET_TYPE
1309# define ATTRIB_NORET __attribute__((noreturn))
1310# define NORET_AND noreturn,
1311
1312
1313extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1314
1315
1316extern unsigned int ext4_block_group(struct super_block *sb,
1317 ext4_fsblk_t blocknr);
1318extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1319 ext4_fsblk_t blocknr);
1320extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1321extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1322 ext4_group_t group);
1323extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1324 ext4_fsblk_t goal, unsigned long *count, int *errp);
1325extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1326extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1327extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1328 ext4_fsblk_t block, unsigned long count, int metadata);
1329extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1330 ext4_fsblk_t block, unsigned long count);
1331extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1332extern void ext4_check_blocks_bitmap(struct super_block *);
1333extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1334 ext4_group_t block_group,
1335 struct buffer_head ** bh);
1336extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1337struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1338 ext4_group_t block_group);
1339extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1340 struct buffer_head *bh,
1341 ext4_group_t group,
1342 struct ext4_group_desc *desc);
1343#define ext4_free_blocks_after_init(sb, group, desc) \
1344 ext4_init_block_bitmap(sb, NULL, group, desc)
1345
1346
1347extern int ext4_check_dir_entry(const char *, struct inode *,
1348 struct ext4_dir_entry_2 *,
1349 struct buffer_head *, unsigned int);
1350extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1351 __u32 minor_hash,
1352 struct ext4_dir_entry_2 *dirent);
1353extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1354
1355
1356extern int ext4_sync_file(struct file *, struct dentry *, int);
1357
1358
1359extern int ext4fs_dirhash(const char *name, int len, struct
1360 dx_hash_info *hinfo);
1361
1362
1363extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1364 const struct qstr *qstr, __u32 goal);
1365extern void ext4_free_inode(handle_t *, struct inode *);
1366extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1367extern unsigned long ext4_count_free_inodes(struct super_block *);
1368extern unsigned long ext4_count_dirs(struct super_block *);
1369extern void ext4_check_inodes_bitmap(struct super_block *);
1370extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1371 struct buffer_head *bh,
1372 ext4_group_t group,
1373 struct ext4_group_desc *desc);
1374extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1375
1376
1377extern long ext4_mb_stats;
1378extern long ext4_mb_max_to_scan;
1379extern int ext4_mb_init(struct super_block *, int);
1380extern int ext4_mb_release(struct super_block *);
1381extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1382 struct ext4_allocation_request *, int *);
1383extern int ext4_mb_reserve_blocks(struct super_block *, int);
1384extern void ext4_discard_preallocations(struct inode *);
1385extern int __init init_ext4_mballoc(void);
1386extern void exit_ext4_mballoc(void);
1387extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1388 ext4_fsblk_t, unsigned long, int, unsigned long *);
1389extern int ext4_mb_add_groupinfo(struct super_block *sb,
1390 ext4_group_t i, struct ext4_group_desc *desc);
1391extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1392extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1393 ext4_group_t, int);
1394
1395int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1396 struct buffer_head *bh, ext4_fsblk_t blocknr);
1397struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1398 ext4_lblk_t, int, int *);
1399struct buffer_head *ext4_bread(handle_t *, struct inode *,
1400 ext4_lblk_t, int, int *);
1401int ext4_get_block(struct inode *inode, sector_t iblock,
1402 struct buffer_head *bh_result, int create);
1403
1404extern struct inode *ext4_iget(struct super_block *, unsigned long);
1405extern int ext4_write_inode(struct inode *, int);
1406extern int ext4_setattr(struct dentry *, struct iattr *);
1407extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1408 struct kstat *stat);
1409extern void ext4_delete_inode(struct inode *);
1410extern int ext4_sync_inode(handle_t *, struct inode *);
1411extern void ext4_dirty_inode(struct inode *);
1412extern int ext4_change_inode_journal_flag(struct inode *, int);
1413extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1414extern int ext4_can_truncate(struct inode *inode);
1415extern void ext4_truncate(struct inode *);
1416extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1417extern void ext4_set_inode_flags(struct inode *);
1418extern void ext4_get_inode_flags(struct ext4_inode_info *);
1419extern int ext4_alloc_da_blocks(struct inode *inode);
1420extern void ext4_set_aops(struct inode *inode);
1421extern int ext4_writepage_trans_blocks(struct inode *);
1422extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1423extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1424extern int ext4_block_truncate_page(handle_t *handle,
1425 struct address_space *mapping, loff_t from);
1426extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1427extern qsize_t ext4_get_reserved_space(struct inode *inode);
1428extern int flush_aio_dio_completed_IO(struct inode *inode);
1429
1430extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1431extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1432
1433
1434extern int ext4_ext_migrate(struct inode *);
1435
1436
1437extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1438extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1439extern int ext4_orphan_add(handle_t *, struct inode *);
1440extern int ext4_orphan_del(handle_t *, struct inode *);
1441extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1442 __u32 start_minor_hash, __u32 *next_hash);
1443
1444
1445extern int ext4_group_add(struct super_block *sb,
1446 struct ext4_new_group_data *input);
1447extern int ext4_group_extend(struct super_block *sb,
1448 struct ext4_super_block *es,
1449 ext4_fsblk_t n_blocks_count);
1450
1451
1452extern void ext4_error(struct super_block *, const char *, const char *, ...)
1453 __attribute__ ((format (printf, 3, 4)));
1454extern void __ext4_std_error(struct super_block *, const char *, int);
1455extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1456 __attribute__ ((format (printf, 3, 4)));
1457extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1458 __attribute__ ((format (printf, 3, 4)));
1459extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1460 __attribute__ ((format (printf, 3, 4)));
1461extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1462 const char *, const char *, ...)
1463 __attribute__ ((format (printf, 4, 5)));
1464extern void ext4_update_dynamic_rev(struct super_block *sb);
1465extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1466 __u32 compat);
1467extern int ext4_update_rocompat_feature(handle_t *handle,
1468 struct super_block *sb, __u32 rocompat);
1469extern int ext4_update_incompat_feature(handle_t *handle,
1470 struct super_block *sb, __u32 incompat);
1471extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1472 struct ext4_group_desc *bg);
1473extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1474 struct ext4_group_desc *bg);
1475extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1476 struct ext4_group_desc *bg);
1477extern __u32 ext4_free_blks_count(struct super_block *sb,
1478 struct ext4_group_desc *bg);
1479extern __u32 ext4_free_inodes_count(struct super_block *sb,
1480 struct ext4_group_desc *bg);
1481extern __u32 ext4_used_dirs_count(struct super_block *sb,
1482 struct ext4_group_desc *bg);
1483extern __u32 ext4_itable_unused_count(struct super_block *sb,
1484 struct ext4_group_desc *bg);
1485extern void ext4_block_bitmap_set(struct super_block *sb,
1486 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1487extern void ext4_inode_bitmap_set(struct super_block *sb,
1488 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1489extern void ext4_inode_table_set(struct super_block *sb,
1490 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1491extern void ext4_free_blks_set(struct super_block *sb,
1492 struct ext4_group_desc *bg, __u32 count);
1493extern void ext4_free_inodes_set(struct super_block *sb,
1494 struct ext4_group_desc *bg, __u32 count);
1495extern void ext4_used_dirs_set(struct super_block *sb,
1496 struct ext4_group_desc *bg, __u32 count);
1497extern void ext4_itable_unused_set(struct super_block *sb,
1498 struct ext4_group_desc *bg, __u32 count);
1499extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1500 struct ext4_group_desc *gdp);
1501extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1502 struct ext4_group_desc *gdp);
1503
1504static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1505{
1506 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1507 le32_to_cpu(es->s_blocks_count_lo);
1508}
1509
1510static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1511{
1512 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1513 le32_to_cpu(es->s_r_blocks_count_lo);
1514}
1515
1516static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1517{
1518 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1519 le32_to_cpu(es->s_free_blocks_count_lo);
1520}
1521
1522static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1523 ext4_fsblk_t blk)
1524{
1525 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1526 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1527}
1528
1529static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1530 ext4_fsblk_t blk)
1531{
1532 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1533 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1534}
1535
1536static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1537 ext4_fsblk_t blk)
1538{
1539 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1540 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1541}
1542
1543static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1544{
1545 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1546 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1547 le32_to_cpu(raw_inode->i_size_lo);
1548 else
1549 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1550}
1551
1552static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1553{
1554 raw_inode->i_size_lo = cpu_to_le32(i_size);
1555 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1556}
1557
1558static inline
1559struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1560 ext4_group_t group)
1561{
1562 struct ext4_group_info ***grp_info;
1563 long indexv, indexh;
1564 grp_info = EXT4_SB(sb)->s_group_info;
1565 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1566 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1567 return grp_info[indexv][indexh];
1568}
1569
1570
1571
1572
1573
1574
1575static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1576{
1577 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1578
1579 smp_rmb();
1580 return ngroups;
1581}
1582
1583static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1584 ext4_group_t block_group)
1585{
1586 return block_group >> sbi->s_log_groups_per_flex;
1587}
1588
1589static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1590{
1591 return 1 << sbi->s_log_groups_per_flex;
1592}
1593
1594#define ext4_std_error(sb, errno) \
1595do { \
1596 if ((errno)) \
1597 __ext4_std_error((sb), __func__, (errno)); \
1598} while (0)
1599
1600#ifdef CONFIG_SMP
1601
1602
1603
1604
1605#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1606#else
1607#define EXT4_FREEBLOCKS_WATERMARK 0
1608#endif
1609
1610static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1611{
1612
1613
1614
1615 down_write(&EXT4_I(inode)->i_data_sem);
1616 if (newsize > EXT4_I(inode)->i_disksize)
1617 EXT4_I(inode)->i_disksize = newsize;
1618 up_write(&EXT4_I(inode)->i_data_sem);
1619 return ;
1620}
1621
1622struct ext4_group_info {
1623 unsigned long bb_state;
1624 struct rb_root bb_free_root;
1625 ext4_grpblk_t bb_first_free;
1626 ext4_grpblk_t bb_free;
1627 ext4_grpblk_t bb_fragments;
1628 struct list_head bb_prealloc_list;
1629#ifdef DOUBLE_CHECK
1630 void *bb_bitmap;
1631#endif
1632 struct rw_semaphore alloc_sem;
1633 ext4_grpblk_t bb_counters[];
1634
1635
1636
1637};
1638
1639#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1640
1641#define EXT4_MB_GRP_NEED_INIT(grp) \
1642 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1643
1644#define EXT4_MAX_CONTENTION 8
1645#define EXT4_CONTENTION_THRESHOLD 2
1646
1647static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1648 ext4_group_t group)
1649{
1650 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1651}
1652
1653
1654
1655
1656
1657static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1658{
1659 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1660}
1661
1662static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1663{
1664 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1665 if (spin_trylock(lock))
1666
1667
1668
1669
1670 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1671 else {
1672
1673
1674
1675
1676 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1677 EXT4_MAX_CONTENTION);
1678 spin_lock(lock);
1679 }
1680}
1681
1682static inline void ext4_unlock_group(struct super_block *sb,
1683 ext4_group_t group)
1684{
1685 spin_unlock(ext4_group_lock_ptr(sb, group));
1686}
1687
1688
1689
1690
1691
1692
1693extern const struct file_operations ext4_dir_operations;
1694
1695
1696extern const struct inode_operations ext4_file_inode_operations;
1697extern const struct file_operations ext4_file_operations;
1698
1699
1700extern const struct inode_operations ext4_dir_inode_operations;
1701extern const struct inode_operations ext4_special_inode_operations;
1702extern struct dentry *ext4_get_parent(struct dentry *child);
1703
1704
1705extern const struct inode_operations ext4_symlink_inode_operations;
1706extern const struct inode_operations ext4_fast_symlink_inode_operations;
1707
1708
1709extern void ext4_release_system_zone(struct super_block *sb);
1710extern int ext4_setup_system_zone(struct super_block *sb);
1711extern int __init init_ext4_system_zone(void);
1712extern void exit_ext4_system_zone(void);
1713extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1714 ext4_fsblk_t start_blk,
1715 unsigned int count);
1716
1717
1718extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1719extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1720extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1721 int chunk);
1722extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1723 ext4_lblk_t iblock, unsigned int max_blocks,
1724 struct buffer_head *bh_result, int flags);
1725extern void ext4_ext_truncate(struct inode *);
1726extern void ext4_ext_init(struct super_block *);
1727extern void ext4_ext_release(struct super_block *);
1728extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1729 loff_t len);
1730extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
1731 loff_t len);
1732extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1733 sector_t block, unsigned int max_blocks,
1734 struct buffer_head *bh, int flags);
1735extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1736 __u64 start, __u64 len);
1737
1738extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1739 __u64 start_orig, __u64 start_donor,
1740 __u64 len, __u64 *moved_len);
1741
1742
1743
1744
1745
1746
1747
1748#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1749
1750static inline int bitmap_uptodate(struct buffer_head *bh)
1751{
1752 return (buffer_uptodate(bh) &&
1753 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1754}
1755static inline void set_bitmap_uptodate(struct buffer_head *bh)
1756{
1757 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1758}
1759
1760#endif
1761
1762#endif
1763