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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#ifdef __KERNEL__
33#include <linux/compat.h>
34#endif
35
36
37
38
39
40
41
42
43#undef EXT4FS_DEBUG
44
45
46
47
48#ifdef EXT4FS_DEBUG
49#define ext4_debug(f, a...) \
50 do { \
51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
52 __FILE__, __LINE__, __func__); \
53 printk(KERN_DEBUG f, ## a); \
54 } while (0)
55#else
56#define ext4_debug(f, a...) do {} while (0)
57#endif
58
59#define EXT4_ERROR_INODE(inode, fmt, a...) \
60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
61
62#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
64
65#define EXT4_ERROR_FILE(file, block, fmt, a...) \
66 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
67
68
69typedef int ext4_grpblk_t;
70
71
72typedef unsigned long long ext4_fsblk_t;
73
74
75typedef __u32 ext4_lblk_t;
76
77
78typedef unsigned int ext4_group_t;
79
80
81
82
83
84
85
86
87
88#define EXT4_MB_HINT_MERGE 0x0001
89
90#define EXT4_MB_HINT_RESERVED 0x0002
91
92#define EXT4_MB_HINT_METADATA 0x0004
93
94#define EXT4_MB_HINT_FIRST 0x0008
95
96#define EXT4_MB_HINT_BEST 0x0010
97
98#define EXT4_MB_HINT_DATA 0x0020
99
100#define EXT4_MB_HINT_NOPREALLOC 0x0040
101
102#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
103
104#define EXT4_MB_HINT_GOAL_ONLY 0x0100
105
106#define EXT4_MB_HINT_TRY_GOAL 0x0200
107
108#define EXT4_MB_DELALLOC_RESERVED 0x0400
109
110#define EXT4_MB_STREAM_ALLOC 0x0800
111
112
113struct ext4_allocation_request {
114
115 struct inode *inode;
116
117 unsigned int len;
118
119 ext4_lblk_t logical;
120
121 ext4_lblk_t lleft;
122
123 ext4_lblk_t lright;
124
125 ext4_fsblk_t goal;
126
127 ext4_fsblk_t pleft;
128
129 ext4_fsblk_t pright;
130
131 unsigned int flags;
132};
133
134
135
136
137
138
139
140
141#define EXT4_MAP_NEW (1 << BH_New)
142#define EXT4_MAP_MAPPED (1 << BH_Mapped)
143#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
144#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
145#define EXT4_MAP_UNINIT (1 << BH_Uninit)
146#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
147 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
148 EXT4_MAP_UNINIT)
149
150struct ext4_map_blocks {
151 ext4_fsblk_t m_pblk;
152 ext4_lblk_t m_lblk;
153 unsigned int m_len;
154 unsigned int m_flags;
155};
156
157
158
159
160struct mpage_da_data {
161 struct inode *inode;
162 sector_t b_blocknr;
163 size_t b_size;
164 unsigned long b_state;
165 unsigned long first_page, next_page;
166 struct writeback_control *wbc;
167 int io_done;
168 int pages_written;
169 int retval;
170};
171
172
173
174
175#define EXT4_IO_END_UNWRITTEN 0x0001
176#define EXT4_IO_END_ERROR 0x0002
177
178struct ext4_io_page {
179 struct page *p_page;
180 atomic_t p_count;
181};
182
183#define MAX_IO_PAGES 128
184
185typedef struct ext4_io_end {
186 struct list_head list;
187 struct inode *inode;
188 unsigned int flag;
189 struct page *page;
190 loff_t offset;
191 ssize_t size;
192 struct work_struct work;
193 struct kiocb *iocb;
194 int result;
195 int num_io_pages;
196 struct ext4_io_page *pages[MAX_IO_PAGES];
197} ext4_io_end_t;
198
199struct ext4_io_submit {
200 int io_op;
201 struct bio *io_bio;
202 ext4_io_end_t *io_end;
203 struct ext4_io_page *io_page;
204 sector_t io_next_block;
205};
206
207
208
209
210#define EXT4_BAD_INO 1
211#define EXT4_ROOT_INO 2
212#define EXT4_BOOT_LOADER_INO 5
213#define EXT4_UNDEL_DIR_INO 6
214#define EXT4_RESIZE_INO 7
215#define EXT4_JOURNAL_INO 8
216
217
218#define EXT4_GOOD_OLD_FIRST_INO 11
219
220
221
222
223#define EXT4_LINK_MAX 65000
224
225
226
227
228#define EXT4_MIN_BLOCK_SIZE 1024
229#define EXT4_MAX_BLOCK_SIZE 65536
230#define EXT4_MIN_BLOCK_LOG_SIZE 10
231#define EXT4_MAX_BLOCK_LOG_SIZE 16
232#ifdef __KERNEL__
233# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
234#else
235# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
236#endif
237#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
238#ifdef __KERNEL__
239# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
240#else
241# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
242#endif
243#ifdef __KERNEL__
244#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
245#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
246#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
247#else
248#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
249 EXT4_GOOD_OLD_INODE_SIZE : \
250 (s)->s_inode_size)
251#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
252 EXT4_GOOD_OLD_FIRST_INO : \
253 (s)->s_first_ino)
254#endif
255#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
256
257
258
259
260struct ext4_group_desc
261{
262 __le32 bg_block_bitmap_lo;
263 __le32 bg_inode_bitmap_lo;
264 __le32 bg_inode_table_lo;
265 __le16 bg_free_blocks_count_lo;
266 __le16 bg_free_inodes_count_lo;
267 __le16 bg_used_dirs_count_lo;
268 __le16 bg_flags;
269 __u32 bg_reserved[2];
270 __le16 bg_itable_unused_lo;
271 __le16 bg_checksum;
272 __le32 bg_block_bitmap_hi;
273 __le32 bg_inode_bitmap_hi;
274 __le32 bg_inode_table_hi;
275 __le16 bg_free_blocks_count_hi;
276 __le16 bg_free_inodes_count_hi;
277 __le16 bg_used_dirs_count_hi;
278 __le16 bg_itable_unused_hi;
279 __u32 bg_reserved2[3];
280};
281
282
283
284
285
286struct flex_groups {
287 atomic_t free_inodes;
288 atomic_t free_blocks;
289 atomic_t used_dirs;
290};
291
292#define EXT4_BG_INODE_UNINIT 0x0001
293#define EXT4_BG_BLOCK_UNINIT 0x0002
294#define EXT4_BG_INODE_ZEROED 0x0004
295
296
297
298
299#define EXT4_MIN_DESC_SIZE 32
300#define EXT4_MIN_DESC_SIZE_64BIT 64
301#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
302#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
303#ifdef __KERNEL__
304# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
305# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
306# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
307# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
308#else
309# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
310# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
311# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
312#endif
313
314
315
316
317#define EXT4_NDIR_BLOCKS 12
318#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
319#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
320#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
321#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
322
323
324
325
326#define EXT4_SECRM_FL 0x00000001
327#define EXT4_UNRM_FL 0x00000002
328#define EXT4_COMPR_FL 0x00000004
329#define EXT4_SYNC_FL 0x00000008
330#define EXT4_IMMUTABLE_FL 0x00000010
331#define EXT4_APPEND_FL 0x00000020
332#define EXT4_NODUMP_FL 0x00000040
333#define EXT4_NOATIME_FL 0x00000080
334
335#define EXT4_DIRTY_FL 0x00000100
336#define EXT4_COMPRBLK_FL 0x00000200
337#define EXT4_NOCOMPR_FL 0x00000400
338#define EXT4_ECOMPR_FL 0x00000800
339
340#define EXT4_INDEX_FL 0x00001000
341#define EXT4_IMAGIC_FL 0x00002000
342#define EXT4_JOURNAL_DATA_FL 0x00004000
343#define EXT4_NOTAIL_FL 0x00008000
344#define EXT4_DIRSYNC_FL 0x00010000
345#define EXT4_TOPDIR_FL 0x00020000
346#define EXT4_HUGE_FILE_FL 0x00040000
347#define EXT4_EXTENTS_FL 0x00080000
348#define EXT4_EA_INODE_FL 0x00200000
349#define EXT4_EOFBLOCKS_FL 0x00400000
350#define EXT4_RESERVED_FL 0x80000000
351
352#define EXT4_FL_USER_VISIBLE 0x004BDFFF
353#define EXT4_FL_USER_MODIFIABLE 0x004B80FF
354
355
356#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
357 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
358 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
359 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
360 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
361
362
363#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
364
365
366#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
367
368
369static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
370{
371 if (S_ISDIR(mode))
372 return flags;
373 else if (S_ISREG(mode))
374 return flags & EXT4_REG_FLMASK;
375 else
376 return flags & EXT4_OTHER_FLMASK;
377}
378
379
380
381
382enum {
383 EXT4_INODE_SECRM = 0,
384 EXT4_INODE_UNRM = 1,
385 EXT4_INODE_COMPR = 2,
386 EXT4_INODE_SYNC = 3,
387 EXT4_INODE_IMMUTABLE = 4,
388 EXT4_INODE_APPEND = 5,
389 EXT4_INODE_NODUMP = 6,
390 EXT4_INODE_NOATIME = 7,
391
392 EXT4_INODE_DIRTY = 8,
393 EXT4_INODE_COMPRBLK = 9,
394 EXT4_INODE_NOCOMPR = 10,
395 EXT4_INODE_ECOMPR = 11,
396
397 EXT4_INODE_INDEX = 12,
398 EXT4_INODE_IMAGIC = 13,
399 EXT4_INODE_JOURNAL_DATA = 14,
400 EXT4_INODE_NOTAIL = 15,
401 EXT4_INODE_DIRSYNC = 16,
402 EXT4_INODE_TOPDIR = 17,
403 EXT4_INODE_HUGE_FILE = 18,
404 EXT4_INODE_EXTENTS = 19,
405 EXT4_INODE_EA_INODE = 21,
406 EXT4_INODE_EOFBLOCKS = 22,
407 EXT4_INODE_RESERVED = 31,
408};
409
410#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
411#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
412 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
413 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
414
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428
429static inline void ext4_check_flag_values(void)
430{
431 CHECK_FLAG_VALUE(SECRM);
432 CHECK_FLAG_VALUE(UNRM);
433 CHECK_FLAG_VALUE(COMPR);
434 CHECK_FLAG_VALUE(SYNC);
435 CHECK_FLAG_VALUE(IMMUTABLE);
436 CHECK_FLAG_VALUE(APPEND);
437 CHECK_FLAG_VALUE(NODUMP);
438 CHECK_FLAG_VALUE(NOATIME);
439 CHECK_FLAG_VALUE(DIRTY);
440 CHECK_FLAG_VALUE(COMPRBLK);
441 CHECK_FLAG_VALUE(NOCOMPR);
442 CHECK_FLAG_VALUE(ECOMPR);
443 CHECK_FLAG_VALUE(INDEX);
444 CHECK_FLAG_VALUE(IMAGIC);
445 CHECK_FLAG_VALUE(JOURNAL_DATA);
446 CHECK_FLAG_VALUE(NOTAIL);
447 CHECK_FLAG_VALUE(DIRSYNC);
448 CHECK_FLAG_VALUE(TOPDIR);
449 CHECK_FLAG_VALUE(HUGE_FILE);
450 CHECK_FLAG_VALUE(EXTENTS);
451 CHECK_FLAG_VALUE(EA_INODE);
452 CHECK_FLAG_VALUE(EOFBLOCKS);
453 CHECK_FLAG_VALUE(RESERVED);
454}
455
456
457struct ext4_new_group_input {
458 __u32 group;
459 __u64 block_bitmap;
460 __u64 inode_bitmap;
461 __u64 inode_table;
462 __u32 blocks_count;
463 __u16 reserved_blocks;
464 __u16 unused;
465};
466
467#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
468struct compat_ext4_new_group_input {
469 u32 group;
470 compat_u64 block_bitmap;
471 compat_u64 inode_bitmap;
472 compat_u64 inode_table;
473 u32 blocks_count;
474 u16 reserved_blocks;
475 u16 unused;
476};
477#endif
478
479
480struct ext4_new_group_data {
481 __u32 group;
482 __u64 block_bitmap;
483 __u64 inode_bitmap;
484 __u64 inode_table;
485 __u32 blocks_count;
486 __u16 reserved_blocks;
487 __u16 unused;
488 __u32 free_blocks_count;
489};
490
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493
494
495
496#define EXT4_GET_BLOCKS_CREATE 0x0001
497
498#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
499#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
500 EXT4_GET_BLOCKS_CREATE)
501
502
503
504#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
505
506
507
508#define EXT4_GET_BLOCKS_PRE_IO 0x0008
509#define EXT4_GET_BLOCKS_CONVERT 0x0010
510#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
511 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
512
513#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
514 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
515
516
517
518
519#define EXT4_FREE_BLOCKS_METADATA 0x0001
520#define EXT4_FREE_BLOCKS_FORGET 0x0002
521#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
522
523
524
525
526#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
527#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
528#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
529#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
530#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
531#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
532#ifdef CONFIG_JBD2_DEBUG
533#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
534#endif
535#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
536#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
537#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
538#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
539#define EXT4_IOC_MIGRATE _IO('f', 9)
540
541
542#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
543#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
544
545#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
546
547
548
549#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
550#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
551#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
552#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
553#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
554#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
555#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
556#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
557#ifdef CONFIG_JBD2_DEBUG
558#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
559#endif
560#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
561#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
562#endif
563
564
565#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
566
567
568
569
570struct ext4_inode {
571 __le16 i_mode;
572 __le16 i_uid;
573 __le32 i_size_lo;
574 __le32 i_atime;
575 __le32 i_ctime;
576 __le32 i_mtime;
577 __le32 i_dtime;
578 __le16 i_gid;
579 __le16 i_links_count;
580 __le32 i_blocks_lo;
581 __le32 i_flags;
582 union {
583 struct {
584 __le32 l_i_version;
585 } linux1;
586 struct {
587 __u32 h_i_translator;
588 } hurd1;
589 struct {
590 __u32 m_i_reserved1;
591 } masix1;
592 } osd1;
593 __le32 i_block[EXT4_N_BLOCKS];
594 __le32 i_generation;
595 __le32 i_file_acl_lo;
596 __le32 i_size_high;
597 __le32 i_obso_faddr;
598 union {
599 struct {
600 __le16 l_i_blocks_high;
601 __le16 l_i_file_acl_high;
602 __le16 l_i_uid_high;
603 __le16 l_i_gid_high;
604 __u32 l_i_reserved2;
605 } linux2;
606 struct {
607 __le16 h_i_reserved1;
608 __u16 h_i_mode_high;
609 __u16 h_i_uid_high;
610 __u16 h_i_gid_high;
611 __u32 h_i_author;
612 } hurd2;
613 struct {
614 __le16 h_i_reserved1;
615 __le16 m_i_file_acl_high;
616 __u32 m_i_reserved2[2];
617 } masix2;
618 } osd2;
619 __le16 i_extra_isize;
620 __le16 i_pad1;
621 __le32 i_ctime_extra;
622 __le32 i_mtime_extra;
623 __le32 i_atime_extra;
624 __le32 i_crtime;
625 __le32 i_crtime_extra;
626 __le32 i_version_hi;
627};
628
629struct move_extent {
630 __u32 reserved;
631 __u32 donor_fd;
632 __u64 orig_start;
633 __u64 donor_start;
634 __u64 len;
635 __u64 moved_len;
636};
637
638#define EXT4_EPOCH_BITS 2
639#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
640#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
641
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649
650
651
652#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
653 ((offsetof(typeof(*ext4_inode), field) + \
654 sizeof((ext4_inode)->field)) \
655 <= (EXT4_GOOD_OLD_INODE_SIZE + \
656 (einode)->i_extra_isize)) \
657
658static inline __le32 ext4_encode_extra_time(struct timespec *time)
659{
660 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
661 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
662 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
663}
664
665static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
666{
667 if (sizeof(time->tv_sec) > 4)
668 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
669 << 32;
670 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
671}
672
673#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
674do { \
675 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
676 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
677 (raw_inode)->xtime ## _extra = \
678 ext4_encode_extra_time(&(inode)->xtime); \
679} while (0)
680
681#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
682do { \
683 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
684 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
685 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
686 (raw_inode)->xtime ## _extra = \
687 ext4_encode_extra_time(&(einode)->xtime); \
688} while (0)
689
690#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
691do { \
692 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
693 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
694 ext4_decode_extra_time(&(inode)->xtime, \
695 raw_inode->xtime ## _extra); \
696 else \
697 (inode)->xtime.tv_nsec = 0; \
698} while (0)
699
700#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
701do { \
702 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
703 (einode)->xtime.tv_sec = \
704 (signed)le32_to_cpu((raw_inode)->xtime); \
705 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
706 ext4_decode_extra_time(&(einode)->xtime, \
707 raw_inode->xtime ## _extra); \
708 else \
709 (einode)->xtime.tv_nsec = 0; \
710} while (0)
711
712#define i_disk_version osd1.linux1.l_i_version
713
714#if defined(__KERNEL__) || defined(__linux__)
715#define i_reserved1 osd1.linux1.l_i_reserved1
716#define i_file_acl_high osd2.linux2.l_i_file_acl_high
717#define i_blocks_high osd2.linux2.l_i_blocks_high
718#define i_uid_low i_uid
719#define i_gid_low i_gid
720#define i_uid_high osd2.linux2.l_i_uid_high
721#define i_gid_high osd2.linux2.l_i_gid_high
722#define i_reserved2 osd2.linux2.l_i_reserved2
723
724#elif defined(__GNU__)
725
726#define i_translator osd1.hurd1.h_i_translator
727#define i_uid_high osd2.hurd2.h_i_uid_high
728#define i_gid_high osd2.hurd2.h_i_gid_high
729#define i_author osd2.hurd2.h_i_author
730
731#elif defined(__masix__)
732
733#define i_reserved1 osd1.masix1.m_i_reserved1
734#define i_file_acl_high osd2.masix2.m_i_file_acl_high
735#define i_reserved2 osd2.masix2.m_i_reserved2
736
737#endif
738
739
740
741
742
743
744struct ext4_ext_cache {
745 ext4_fsblk_t ec_start;
746 ext4_lblk_t ec_block;
747 __u32 ec_len;
748};
749
750
751
752
753struct ext4_inode_info {
754 __le32 i_data[15];
755 __u32 i_dtime;
756 ext4_fsblk_t i_file_acl;
757
758
759
760
761
762
763
764
765 ext4_group_t i_block_group;
766 ext4_lblk_t i_dir_start_lookup;
767#if (BITS_PER_LONG < 64)
768 unsigned long i_state_flags;
769#endif
770 unsigned long i_flags;
771
772#ifdef CONFIG_EXT4_FS_XATTR
773
774
775
776
777
778
779
780 struct rw_semaphore xattr_sem;
781#endif
782
783 struct list_head i_orphan;
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800 loff_t i_disksize;
801
802
803
804
805
806
807
808
809
810
811
812 struct rw_semaphore i_data_sem;
813 struct inode vfs_inode;
814 struct jbd2_inode *jinode;
815
816 struct ext4_ext_cache i_cached_extent;
817
818
819
820
821 struct timespec i_crtime;
822
823
824 struct list_head i_prealloc_list;
825 spinlock_t i_prealloc_lock;
826
827
828 ext4_group_t i_last_alloc_group;
829
830
831 unsigned int i_reserved_data_blocks;
832 unsigned int i_reserved_meta_blocks;
833 unsigned int i_allocated_meta_blocks;
834 ext4_lblk_t i_da_metadata_calc_last_lblock;
835 int i_da_metadata_calc_len;
836
837
838 __u16 i_extra_isize;
839
840#ifdef CONFIG_QUOTA
841
842 qsize_t i_reserved_quota;
843#endif
844
845
846 struct list_head i_completed_io_list;
847 spinlock_t i_completed_io_lock;
848 atomic_t i_ioend_count;
849
850 ext4_io_end_t *cur_aio_dio;
851 atomic_t i_aiodio_unwritten;
852
853 spinlock_t i_block_reservation_lock;
854
855
856
857
858
859 tid_t i_sync_tid;
860 tid_t i_datasync_tid;
861};
862
863
864
865
866#define EXT4_VALID_FS 0x0001
867#define EXT4_ERROR_FS 0x0002
868#define EXT4_ORPHAN_FS 0x0004
869
870
871
872
873#define EXT2_FLAGS_SIGNED_HASH 0x0001
874#define EXT2_FLAGS_UNSIGNED_HASH 0x0002
875#define EXT2_FLAGS_TEST_FILESYS 0x0004
876
877
878
879
880#define EXT4_MOUNT_OLDALLOC 0x00002
881#define EXT4_MOUNT_GRPID 0x00004
882#define EXT4_MOUNT_DEBUG 0x00008
883#define EXT4_MOUNT_ERRORS_CONT 0x00010
884#define EXT4_MOUNT_ERRORS_RO 0x00020
885#define EXT4_MOUNT_ERRORS_PANIC 0x00040
886#define EXT4_MOUNT_MINIX_DF 0x00080
887#define EXT4_MOUNT_NOLOAD 0x00100
888#define EXT4_MOUNT_DATA_FLAGS 0x00C00
889#define EXT4_MOUNT_JOURNAL_DATA 0x00400
890#define EXT4_MOUNT_ORDERED_DATA 0x00800
891#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00
892#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000
893#define EXT4_MOUNT_NO_UID32 0x02000
894#define EXT4_MOUNT_XATTR_USER 0x04000
895#define EXT4_MOUNT_POSIX_ACL 0x08000
896#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000
897#define EXT4_MOUNT_BARRIER 0x20000
898#define EXT4_MOUNT_QUOTA 0x80000
899#define EXT4_MOUNT_USRQUOTA 0x100000
900#define EXT4_MOUNT_GRPQUOTA 0x200000
901#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000
902#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000
903#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000
904#define EXT4_MOUNT_I_VERSION 0x2000000
905#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000
906#define EXT4_MOUNT_DELALLOC 0x8000000
907#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000
908#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000
909#define EXT4_MOUNT_DISCARD 0x40000000
910#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000
911
912#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
913 ~EXT4_MOUNT_##opt
914#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
915 EXT4_MOUNT_##opt
916#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
917 EXT4_MOUNT_##opt)
918
919#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
920 ~EXT4_MOUNT2_##opt
921#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
922 EXT4_MOUNT2_##opt
923#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
924 EXT4_MOUNT2_##opt)
925
926#define ext4_set_bit ext2_set_bit
927#define ext4_set_bit_atomic ext2_set_bit_atomic
928#define ext4_clear_bit ext2_clear_bit
929#define ext4_clear_bit_atomic ext2_clear_bit_atomic
930#define ext4_test_bit ext2_test_bit
931#define ext4_find_first_zero_bit ext2_find_first_zero_bit
932#define ext4_find_next_zero_bit ext2_find_next_zero_bit
933#define ext4_find_next_bit ext2_find_next_bit
934
935
936
937
938#define EXT4_DFL_MAX_MNT_COUNT 20
939#define EXT4_DFL_CHECKINTERVAL 0
940
941
942
943
944#define EXT4_ERRORS_CONTINUE 1
945#define EXT4_ERRORS_RO 2
946#define EXT4_ERRORS_PANIC 3
947#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
948
949
950
951
952struct ext4_super_block {
953 __le32 s_inodes_count;
954 __le32 s_blocks_count_lo;
955 __le32 s_r_blocks_count_lo;
956 __le32 s_free_blocks_count_lo;
957 __le32 s_free_inodes_count;
958 __le32 s_first_data_block;
959 __le32 s_log_block_size;
960 __le32 s_obso_log_frag_size;
961 __le32 s_blocks_per_group;
962 __le32 s_obso_frags_per_group;
963 __le32 s_inodes_per_group;
964 __le32 s_mtime;
965 __le32 s_wtime;
966 __le16 s_mnt_count;
967 __le16 s_max_mnt_count;
968 __le16 s_magic;
969 __le16 s_state;
970 __le16 s_errors;
971 __le16 s_minor_rev_level;
972 __le32 s_lastcheck;
973 __le32 s_checkinterval;
974 __le32 s_creator_os;
975 __le32 s_rev_level;
976 __le16 s_def_resuid;
977 __le16 s_def_resgid;
978
979
980
981
982
983
984
985
986
987
988
989
990
991 __le32 s_first_ino;
992 __le16 s_inode_size;
993 __le16 s_block_group_nr;
994 __le32 s_feature_compat;
995 __le32 s_feature_incompat;
996 __le32 s_feature_ro_compat;
997 __u8 s_uuid[16];
998 char s_volume_name[16];
999 char s_last_mounted[64];
1000 __le32 s_algorithm_usage_bitmap;
1001
1002
1003
1004
1005 __u8 s_prealloc_blocks;
1006 __u8 s_prealloc_dir_blocks;
1007 __le16 s_reserved_gdt_blocks;
1008
1009
1010
1011 __u8 s_journal_uuid[16];
1012 __le32 s_journal_inum;
1013 __le32 s_journal_dev;
1014 __le32 s_last_orphan;
1015 __le32 s_hash_seed[4];
1016 __u8 s_def_hash_version;
1017 __u8 s_jnl_backup_type;
1018 __le16 s_desc_size;
1019 __le32 s_default_mount_opts;
1020 __le32 s_first_meta_bg;
1021 __le32 s_mkfs_time;
1022 __le32 s_jnl_blocks[17];
1023
1024 __le32 s_blocks_count_hi;
1025 __le32 s_r_blocks_count_hi;
1026 __le32 s_free_blocks_count_hi;
1027 __le16 s_min_extra_isize;
1028 __le16 s_want_extra_isize;
1029 __le32 s_flags;
1030 __le16 s_raid_stride;
1031 __le16 s_mmp_interval;
1032 __le64 s_mmp_block;
1033 __le32 s_raid_stripe_width;
1034 __u8 s_log_groups_per_flex;
1035 __u8 s_reserved_char_pad;
1036 __le16 s_reserved_pad;
1037 __le64 s_kbytes_written;
1038 __le32 s_snapshot_inum;
1039 __le32 s_snapshot_id;
1040 __le64 s_snapshot_r_blocks_count;
1041
1042 __le32 s_snapshot_list;
1043
1044#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1045 __le32 s_error_count;
1046 __le32 s_first_error_time;
1047 __le32 s_first_error_ino;
1048 __le64 s_first_error_block;
1049 __u8 s_first_error_func[32];
1050 __le32 s_first_error_line;
1051 __le32 s_last_error_time;
1052 __le32 s_last_error_ino;
1053 __le32 s_last_error_line;
1054 __le64 s_last_error_block;
1055 __u8 s_last_error_func[32];
1056#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1057 __u8 s_mount_opts[64];
1058 __le32 s_reserved[112];
1059};
1060
1061#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1062
1063#ifdef __KERNEL__
1064
1065
1066
1067
1068#define EXT4_MF_MNTDIR_SAMPLED 0x0001
1069#define EXT4_MF_FS_ABORTED 0x0002
1070
1071
1072
1073
1074struct ext4_sb_info {
1075 unsigned long s_desc_size;
1076 unsigned long s_inodes_per_block;
1077 unsigned long s_blocks_per_group;
1078 unsigned long s_inodes_per_group;
1079 unsigned long s_itb_per_group;
1080 unsigned long s_gdb_count;
1081 unsigned long s_desc_per_block;
1082 ext4_group_t s_groups_count;
1083 ext4_group_t s_blockfile_groups;
1084 unsigned long s_overhead_last;
1085 unsigned long s_blocks_last;
1086 loff_t s_bitmap_maxbytes;
1087 struct buffer_head * s_sbh;
1088 struct ext4_super_block *s_es;
1089 struct buffer_head **s_group_desc;
1090 unsigned int s_mount_opt;
1091 unsigned int s_mount_opt2;
1092 unsigned int s_mount_flags;
1093 ext4_fsblk_t s_sb_block;
1094 uid_t s_resuid;
1095 gid_t s_resgid;
1096 unsigned short s_mount_state;
1097 unsigned short s_pad;
1098 int s_addr_per_block_bits;
1099 int s_desc_per_block_bits;
1100 int s_inode_size;
1101 int s_first_ino;
1102 unsigned int s_inode_readahead_blks;
1103 unsigned int s_inode_goal;
1104 spinlock_t s_next_gen_lock;
1105 u32 s_next_generation;
1106 u32 s_hash_seed[4];
1107 int s_def_hash_version;
1108 int s_hash_unsigned;
1109 struct percpu_counter s_freeblocks_counter;
1110 struct percpu_counter s_freeinodes_counter;
1111 struct percpu_counter s_dirs_counter;
1112 struct percpu_counter s_dirtyblocks_counter;
1113 struct blockgroup_lock *s_blockgroup_lock;
1114 struct proc_dir_entry *s_proc;
1115 struct kobject s_kobj;
1116 struct completion s_kobj_unregister;
1117
1118
1119 struct journal_s *s_journal;
1120 struct list_head s_orphan;
1121 struct mutex s_orphan_lock;
1122 struct mutex s_resize_lock;
1123 unsigned long s_commit_interval;
1124 u32 s_max_batch_time;
1125 u32 s_min_batch_time;
1126 struct block_device *journal_bdev;
1127#ifdef CONFIG_JBD2_DEBUG
1128 struct timer_list turn_ro_timer;
1129 wait_queue_head_t ro_wait_queue;
1130#endif
1131#ifdef CONFIG_QUOTA
1132 char *s_qf_names[MAXQUOTAS];
1133 int s_jquota_fmt;
1134#endif
1135 unsigned int s_want_extra_isize;
1136 struct rb_root system_blks;
1137
1138#ifdef EXTENTS_STATS
1139
1140 unsigned long s_ext_min;
1141 unsigned long s_ext_max;
1142 unsigned long s_depth_max;
1143 spinlock_t s_ext_stats_lock;
1144 unsigned long s_ext_blocks;
1145 unsigned long s_ext_extents;
1146#endif
1147
1148
1149 struct ext4_group_info ***s_group_info;
1150 struct inode *s_buddy_cache;
1151 spinlock_t s_md_lock;
1152 unsigned short *s_mb_offsets;
1153 unsigned int *s_mb_maxs;
1154
1155
1156 unsigned long s_stripe;
1157 unsigned int s_mb_stream_request;
1158 unsigned int s_mb_max_to_scan;
1159 unsigned int s_mb_min_to_scan;
1160 unsigned int s_mb_stats;
1161 unsigned int s_mb_order2_reqs;
1162 unsigned int s_mb_group_prealloc;
1163 unsigned int s_max_writeback_mb_bump;
1164
1165 unsigned long s_mb_last_group;
1166 unsigned long s_mb_last_start;
1167
1168
1169 atomic_t s_bal_reqs;
1170 atomic_t s_bal_success;
1171 atomic_t s_bal_allocated;
1172 atomic_t s_bal_ex_scanned;
1173 atomic_t s_bal_goals;
1174 atomic_t s_bal_breaks;
1175 atomic_t s_bal_2orders;
1176 spinlock_t s_bal_lock;
1177 unsigned long s_mb_buddies_generated;
1178 unsigned long long s_mb_generation_time;
1179 atomic_t s_mb_lost_chunks;
1180 atomic_t s_mb_preallocated;
1181 atomic_t s_mb_discarded;
1182 atomic_t s_lock_busy;
1183
1184
1185 struct ext4_locality_group __percpu *s_locality_groups;
1186
1187
1188 unsigned long s_sectors_written_start;
1189 u64 s_kbytes_written;
1190
1191 unsigned int s_log_groups_per_flex;
1192 struct flex_groups *s_flex_groups;
1193
1194
1195 struct workqueue_struct *dio_unwritten_wq;
1196
1197
1198 struct timer_list s_err_report;
1199
1200
1201 struct ext4_li_request *s_li_request;
1202
1203 unsigned int s_li_wait_mult;
1204};
1205
1206static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1207{
1208 return sb->s_fs_info;
1209}
1210static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1211{
1212 return container_of(inode, struct ext4_inode_info, vfs_inode);
1213}
1214
1215static inline struct timespec ext4_current_time(struct inode *inode)
1216{
1217 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1218 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1219}
1220
1221static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1222{
1223 return ino == EXT4_ROOT_INO ||
1224 ino == EXT4_JOURNAL_INO ||
1225 ino == EXT4_RESIZE_INO ||
1226 (ino >= EXT4_FIRST_INO(sb) &&
1227 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1228}
1229
1230
1231
1232
1233enum {
1234 EXT4_STATE_JDATA,
1235 EXT4_STATE_NEW,
1236 EXT4_STATE_XATTR,
1237 EXT4_STATE_NO_EXPAND,
1238 EXT4_STATE_DA_ALLOC_CLOSE,
1239 EXT4_STATE_EXT_MIGRATE,
1240 EXT4_STATE_DIO_UNWRITTEN,
1241 EXT4_STATE_NEWENTRY,
1242 EXT4_STATE_DELALLOC_RESERVED,
1243};
1244
1245#define EXT4_INODE_BIT_FNS(name, field, offset) \
1246static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1247{ \
1248 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1249} \
1250static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1251{ \
1252 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1253} \
1254static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1255{ \
1256 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1257}
1258
1259EXT4_INODE_BIT_FNS(flag, flags, 0)
1260#if (BITS_PER_LONG < 64)
1261EXT4_INODE_BIT_FNS(state, state_flags, 0)
1262
1263static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1264{
1265 (ei)->i_state_flags = 0;
1266}
1267#else
1268EXT4_INODE_BIT_FNS(state, flags, 32)
1269
1270static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1271{
1272
1273}
1274#endif
1275#else
1276
1277
1278
1279#define EXT4_SB(sb) (sb)
1280#endif
1281
1282#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1283
1284
1285
1286
1287#define EXT4_OS_LINUX 0
1288#define EXT4_OS_HURD 1
1289#define EXT4_OS_MASIX 2
1290#define EXT4_OS_FREEBSD 3
1291#define EXT4_OS_LITES 4
1292
1293
1294
1295
1296#define EXT4_GOOD_OLD_REV 0
1297#define EXT4_DYNAMIC_REV 1
1298
1299#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1300#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1301
1302#define EXT4_GOOD_OLD_INODE_SIZE 128
1303
1304
1305
1306
1307
1308#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1309 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1310#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1311 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1312#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1313 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1314#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1315 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1316#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1317 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1318#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1319 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1320#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1321 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1322#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1323 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1324#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1325 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1326
1327#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1328#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1329#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1330#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1331#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1332#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1333
1334#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1335#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1336#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1337#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1338#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1339#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1340#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1341
1342#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1343#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1344#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
1345#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
1346#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1347#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
1348#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1349#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1350#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1351#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
1352#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
1353
1354#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1355#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1356 EXT4_FEATURE_INCOMPAT_RECOVER| \
1357 EXT4_FEATURE_INCOMPAT_META_BG| \
1358 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1359 EXT4_FEATURE_INCOMPAT_64BIT| \
1360 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1361#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1362 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1363 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1364 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1365 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1366 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1367 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1368
1369
1370
1371
1372#define EXT4_DEF_RESUID 0
1373#define EXT4_DEF_RESGID 0
1374
1375#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1376
1377
1378
1379
1380#define EXT4_DEFM_DEBUG 0x0001
1381#define EXT4_DEFM_BSDGROUPS 0x0002
1382#define EXT4_DEFM_XATTR_USER 0x0004
1383#define EXT4_DEFM_ACL 0x0008
1384#define EXT4_DEFM_UID16 0x0010
1385#define EXT4_DEFM_JMODE 0x0060
1386#define EXT4_DEFM_JMODE_DATA 0x0020
1387#define EXT4_DEFM_JMODE_ORDERED 0x0040
1388#define EXT4_DEFM_JMODE_WBACK 0x0060
1389#define EXT4_DEFM_NOBARRIER 0x0100
1390#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1391#define EXT4_DEFM_DISCARD 0x0400
1392#define EXT4_DEFM_NODELALLOC 0x0800
1393
1394
1395
1396
1397#define EXT4_DEF_MIN_BATCH_TIME 0
1398#define EXT4_DEF_MAX_BATCH_TIME 15000
1399
1400
1401
1402
1403
1404#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1405
1406
1407
1408
1409#define EXT4_NAME_LEN 255
1410
1411struct ext4_dir_entry {
1412 __le32 inode;
1413 __le16 rec_len;
1414 __le16 name_len;
1415 char name[EXT4_NAME_LEN];
1416};
1417
1418
1419
1420
1421
1422
1423
1424struct ext4_dir_entry_2 {
1425 __le32 inode;
1426 __le16 rec_len;
1427 __u8 name_len;
1428 __u8 file_type;
1429 char name[EXT4_NAME_LEN];
1430};
1431
1432
1433
1434
1435
1436#define EXT4_FT_UNKNOWN 0
1437#define EXT4_FT_REG_FILE 1
1438#define EXT4_FT_DIR 2
1439#define EXT4_FT_CHRDEV 3
1440#define EXT4_FT_BLKDEV 4
1441#define EXT4_FT_FIFO 5
1442#define EXT4_FT_SOCK 6
1443#define EXT4_FT_SYMLINK 7
1444
1445#define EXT4_FT_MAX 8
1446
1447
1448
1449
1450
1451
1452#define EXT4_DIR_PAD 4
1453#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1454#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1455 ~EXT4_DIR_ROUND)
1456#define EXT4_MAX_REC_LEN ((1<<16)-1)
1457
1458
1459
1460
1461
1462static inline unsigned int
1463ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1464{
1465 unsigned len = le16_to_cpu(dlen);
1466
1467#if (PAGE_CACHE_SIZE >= 65536)
1468 if (len == EXT4_MAX_REC_LEN || len == 0)
1469 return blocksize;
1470 return (len & 65532) | ((len & 3) << 16);
1471#else
1472 return len;
1473#endif
1474}
1475
1476static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1477{
1478 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1479 BUG();
1480#if (PAGE_CACHE_SIZE >= 65536)
1481 if (len < 65536)
1482 return cpu_to_le16(len);
1483 if (len == blocksize) {
1484 if (blocksize == 65536)
1485 return cpu_to_le16(EXT4_MAX_REC_LEN);
1486 else
1487 return cpu_to_le16(0);
1488 }
1489 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1490#else
1491 return cpu_to_le16(len);
1492#endif
1493}
1494
1495
1496
1497
1498
1499
1500#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1501 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1502 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1503#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1504#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1505
1506
1507
1508#define DX_HASH_LEGACY 0
1509#define DX_HASH_HALF_MD4 1
1510#define DX_HASH_TEA 2
1511#define DX_HASH_LEGACY_UNSIGNED 3
1512#define DX_HASH_HALF_MD4_UNSIGNED 4
1513#define DX_HASH_TEA_UNSIGNED 5
1514
1515#ifdef __KERNEL__
1516
1517
1518struct dx_hash_info
1519{
1520 u32 hash;
1521 u32 minor_hash;
1522 int hash_version;
1523 u32 *seed;
1524};
1525
1526#define EXT4_HTREE_EOF 0x7fffffff
1527
1528
1529
1530
1531#define HASH_NB_ALWAYS 1
1532
1533
1534
1535
1536
1537struct ext4_iloc
1538{
1539 struct buffer_head *bh;
1540 unsigned long offset;
1541 ext4_group_t block_group;
1542};
1543
1544static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1545{
1546 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1547}
1548
1549
1550
1551
1552
1553
1554struct dir_private_info {
1555 struct rb_root root;
1556 struct rb_node *curr_node;
1557 struct fname *extra_fname;
1558 loff_t last_pos;
1559 __u32 curr_hash;
1560 __u32 curr_minor_hash;
1561 __u32 next_hash;
1562};
1563
1564
1565static inline ext4_fsblk_t
1566ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1567{
1568 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1569 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1570}
1571
1572
1573
1574
1575#define ERR_BAD_DX_DIR -75000
1576
1577void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1578 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1579
1580
1581
1582
1583#define EXT4_DEF_LI_WAIT_MULT 10
1584#define EXT4_DEF_LI_MAX_START_DELAY 5
1585#define EXT4_LAZYINIT_QUIT 0x0001
1586#define EXT4_LAZYINIT_RUNNING 0x0002
1587
1588
1589
1590
1591struct ext4_lazy_init {
1592 unsigned long li_state;
1593
1594 wait_queue_head_t li_wait_daemon;
1595 wait_queue_head_t li_wait_task;
1596 struct timer_list li_timer;
1597 struct task_struct *li_task;
1598
1599 struct list_head li_request_list;
1600 struct mutex li_list_mtx;
1601};
1602
1603struct ext4_li_request {
1604 struct super_block *lr_super;
1605 struct ext4_sb_info *lr_sbi;
1606 ext4_group_t lr_next_group;
1607 struct list_head lr_request;
1608 unsigned long lr_next_sched;
1609 unsigned long lr_timeout;
1610};
1611
1612struct ext4_features {
1613 struct kobject f_kobj;
1614 struct completion f_kobj_unregister;
1615};
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625# define NORET_TYPE
1626# define ATTRIB_NORET __attribute__((noreturn))
1627# define NORET_AND noreturn,
1628
1629
1630extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1631
1632
1633extern unsigned int ext4_block_group(struct super_block *sb,
1634 ext4_fsblk_t blocknr);
1635extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1636 ext4_fsblk_t blocknr);
1637extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1638extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1639 ext4_group_t group);
1640extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1641 ext4_fsblk_t goal, unsigned long *count, int *errp);
1642extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1643extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1644 ext4_fsblk_t block, unsigned long count);
1645extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1646extern void ext4_check_blocks_bitmap(struct super_block *);
1647extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1648 ext4_group_t block_group,
1649 struct buffer_head ** bh);
1650extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1651struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1652 ext4_group_t block_group);
1653extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1654 struct buffer_head *bh,
1655 ext4_group_t group,
1656 struct ext4_group_desc *desc);
1657#define ext4_free_blocks_after_init(sb, group, desc) \
1658 ext4_init_block_bitmap(sb, NULL, group, desc)
1659
1660
1661extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1662 struct file *,
1663 struct ext4_dir_entry_2 *,
1664 struct buffer_head *, unsigned int);
1665#define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1666 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1667 (de), (bh), (offset)))
1668extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1669 __u32 minor_hash,
1670 struct ext4_dir_entry_2 *dirent);
1671extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1672
1673
1674extern int ext4_sync_file(struct file *, int);
1675extern int ext4_flush_completed_IO(struct inode *);
1676
1677
1678extern int ext4fs_dirhash(const char *name, int len, struct
1679 dx_hash_info *hinfo);
1680
1681
1682extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1683 const struct qstr *qstr, __u32 goal);
1684extern void ext4_free_inode(handle_t *, struct inode *);
1685extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1686extern unsigned long ext4_count_free_inodes(struct super_block *);
1687extern unsigned long ext4_count_dirs(struct super_block *);
1688extern void ext4_check_inodes_bitmap(struct super_block *);
1689extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1690extern int ext4_init_inode_table(struct super_block *sb,
1691 ext4_group_t group, int barrier);
1692
1693
1694extern long ext4_mb_stats;
1695extern long ext4_mb_max_to_scan;
1696extern int ext4_mb_init(struct super_block *, int);
1697extern int ext4_mb_release(struct super_block *);
1698extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1699 struct ext4_allocation_request *, int *);
1700extern int ext4_mb_reserve_blocks(struct super_block *, int);
1701extern void ext4_discard_preallocations(struct inode *);
1702extern int __init ext4_init_mballoc(void);
1703extern void ext4_exit_mballoc(void);
1704extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1705 struct buffer_head *bh, ext4_fsblk_t block,
1706 unsigned long count, int flags);
1707extern int ext4_mb_add_groupinfo(struct super_block *sb,
1708 ext4_group_t i, struct ext4_group_desc *desc);
1709extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1710
1711
1712struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1713 ext4_lblk_t, int, int *);
1714struct buffer_head *ext4_bread(handle_t *, struct inode *,
1715 ext4_lblk_t, int, int *);
1716int ext4_get_block(struct inode *inode, sector_t iblock,
1717 struct buffer_head *bh_result, int create);
1718
1719extern struct inode *ext4_iget(struct super_block *, unsigned long);
1720extern int ext4_write_inode(struct inode *, struct writeback_control *);
1721extern int ext4_setattr(struct dentry *, struct iattr *);
1722extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1723 struct kstat *stat);
1724extern void ext4_evict_inode(struct inode *);
1725extern void ext4_clear_inode(struct inode *);
1726extern int ext4_sync_inode(handle_t *, struct inode *);
1727extern void ext4_dirty_inode(struct inode *);
1728extern int ext4_change_inode_journal_flag(struct inode *, int);
1729extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1730extern int ext4_can_truncate(struct inode *inode);
1731extern void ext4_truncate(struct inode *);
1732extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1733extern void ext4_set_inode_flags(struct inode *);
1734extern void ext4_get_inode_flags(struct ext4_inode_info *);
1735extern int ext4_alloc_da_blocks(struct inode *inode);
1736extern void ext4_set_aops(struct inode *inode);
1737extern int ext4_writepage_trans_blocks(struct inode *);
1738extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1739extern int ext4_block_truncate_page(handle_t *handle,
1740 struct address_space *mapping, loff_t from);
1741extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1742extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1743extern void ext4_da_update_reserve_space(struct inode *inode,
1744 int used, int quota_claim);
1745
1746extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1747extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1748
1749
1750extern int ext4_ext_migrate(struct inode *);
1751
1752
1753extern int ext4_orphan_add(handle_t *, struct inode *);
1754extern int ext4_orphan_del(handle_t *, struct inode *);
1755extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1756 __u32 start_minor_hash, __u32 *next_hash);
1757
1758
1759extern int ext4_group_add(struct super_block *sb,
1760 struct ext4_new_group_data *input);
1761extern int ext4_group_extend(struct super_block *sb,
1762 struct ext4_super_block *es,
1763 ext4_fsblk_t n_blocks_count);
1764
1765
1766extern void __ext4_error(struct super_block *, const char *, unsigned int,
1767 const char *, ...)
1768 __attribute__ ((format (printf, 4, 5)));
1769#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1770 __LINE__, ## message)
1771extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1772 ext4_fsblk_t, const char *, ...)
1773 __attribute__ ((format (printf, 5, 6)));
1774extern void ext4_error_file(struct file *, const char *, unsigned int,
1775 ext4_fsblk_t, const char *, ...)
1776 __attribute__ ((format (printf, 5, 6)));
1777extern void __ext4_std_error(struct super_block *, const char *,
1778 unsigned int, int);
1779extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1780 const char *, ...)
1781 __attribute__ ((format (printf, 4, 5)));
1782#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1783 __LINE__, ## message)
1784extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1785 const char *, ...)
1786 __attribute__ ((format (printf, 4, 5)));
1787#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1788 __LINE__, ## message)
1789extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1790 __attribute__ ((format (printf, 3, 4)));
1791extern void __ext4_grp_locked_error(const char *, unsigned int, \
1792 struct super_block *, ext4_group_t, \
1793 unsigned long, ext4_fsblk_t, \
1794 const char *, ...)
1795 __attribute__ ((format (printf, 7, 8)));
1796#define ext4_grp_locked_error(sb, grp, message...) \
1797 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1798extern void ext4_update_dynamic_rev(struct super_block *sb);
1799extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1800 __u32 compat);
1801extern int ext4_update_rocompat_feature(handle_t *handle,
1802 struct super_block *sb, __u32 rocompat);
1803extern int ext4_update_incompat_feature(handle_t *handle,
1804 struct super_block *sb, __u32 incompat);
1805extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1806 struct ext4_group_desc *bg);
1807extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1808 struct ext4_group_desc *bg);
1809extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1810 struct ext4_group_desc *bg);
1811extern __u32 ext4_free_blks_count(struct super_block *sb,
1812 struct ext4_group_desc *bg);
1813extern __u32 ext4_free_inodes_count(struct super_block *sb,
1814 struct ext4_group_desc *bg);
1815extern __u32 ext4_used_dirs_count(struct super_block *sb,
1816 struct ext4_group_desc *bg);
1817extern __u32 ext4_itable_unused_count(struct super_block *sb,
1818 struct ext4_group_desc *bg);
1819extern void ext4_block_bitmap_set(struct super_block *sb,
1820 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1821extern void ext4_inode_bitmap_set(struct super_block *sb,
1822 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1823extern void ext4_inode_table_set(struct super_block *sb,
1824 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1825extern void ext4_free_blks_set(struct super_block *sb,
1826 struct ext4_group_desc *bg, __u32 count);
1827extern void ext4_free_inodes_set(struct super_block *sb,
1828 struct ext4_group_desc *bg, __u32 count);
1829extern void ext4_used_dirs_set(struct super_block *sb,
1830 struct ext4_group_desc *bg, __u32 count);
1831extern void ext4_itable_unused_set(struct super_block *sb,
1832 struct ext4_group_desc *bg, __u32 count);
1833extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1834 struct ext4_group_desc *gdp);
1835extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1836 struct ext4_group_desc *gdp);
1837
1838static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1839{
1840 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1841 le32_to_cpu(es->s_blocks_count_lo);
1842}
1843
1844static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1845{
1846 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1847 le32_to_cpu(es->s_r_blocks_count_lo);
1848}
1849
1850static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1851{
1852 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1853 le32_to_cpu(es->s_free_blocks_count_lo);
1854}
1855
1856static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1857 ext4_fsblk_t blk)
1858{
1859 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1860 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1861}
1862
1863static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1864 ext4_fsblk_t blk)
1865{
1866 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1867 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1868}
1869
1870static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1871 ext4_fsblk_t blk)
1872{
1873 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1874 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1875}
1876
1877static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1878{
1879 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1880 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1881 le32_to_cpu(raw_inode->i_size_lo);
1882 else
1883 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1884}
1885
1886static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1887{
1888 raw_inode->i_size_lo = cpu_to_le32(i_size);
1889 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1890}
1891
1892static inline
1893struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1894 ext4_group_t group)
1895{
1896 struct ext4_group_info ***grp_info;
1897 long indexv, indexh;
1898 grp_info = EXT4_SB(sb)->s_group_info;
1899 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1900 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1901 return grp_info[indexv][indexh];
1902}
1903
1904
1905
1906
1907
1908
1909static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1910{
1911 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1912
1913 smp_rmb();
1914 return ngroups;
1915}
1916
1917static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1918 ext4_group_t block_group)
1919{
1920 return block_group >> sbi->s_log_groups_per_flex;
1921}
1922
1923static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1924{
1925 return 1 << sbi->s_log_groups_per_flex;
1926}
1927
1928#define ext4_std_error(sb, errno) \
1929do { \
1930 if ((errno)) \
1931 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
1932} while (0)
1933
1934#ifdef CONFIG_SMP
1935
1936
1937
1938
1939#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1940#else
1941#define EXT4_FREEBLOCKS_WATERMARK 0
1942#endif
1943
1944static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1945{
1946
1947
1948
1949 down_write(&EXT4_I(inode)->i_data_sem);
1950 if (newsize > EXT4_I(inode)->i_disksize)
1951 EXT4_I(inode)->i_disksize = newsize;
1952 up_write(&EXT4_I(inode)->i_data_sem);
1953 return ;
1954}
1955
1956struct ext4_group_info {
1957 unsigned long bb_state;
1958 struct rb_root bb_free_root;
1959 ext4_grpblk_t bb_first_free;
1960 ext4_grpblk_t bb_free;
1961 ext4_grpblk_t bb_fragments;
1962 ext4_grpblk_t bb_largest_free_order;
1963 struct list_head bb_prealloc_list;
1964#ifdef DOUBLE_CHECK
1965 void *bb_bitmap;
1966#endif
1967 struct rw_semaphore alloc_sem;
1968 ext4_grpblk_t bb_counters[];
1969
1970
1971
1972};
1973
1974#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1975
1976#define EXT4_MB_GRP_NEED_INIT(grp) \
1977 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1978
1979#define EXT4_MAX_CONTENTION 8
1980#define EXT4_CONTENTION_THRESHOLD 2
1981
1982static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1983 ext4_group_t group)
1984{
1985 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1986}
1987
1988
1989
1990
1991
1992static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1993{
1994 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1995}
1996
1997static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1998{
1999 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2000 if (spin_trylock(lock))
2001
2002
2003
2004
2005 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2006 else {
2007
2008
2009
2010
2011 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2012 EXT4_MAX_CONTENTION);
2013 spin_lock(lock);
2014 }
2015}
2016
2017static inline void ext4_unlock_group(struct super_block *sb,
2018 ext4_group_t group)
2019{
2020 spin_unlock(ext4_group_lock_ptr(sb, group));
2021}
2022
2023static inline void ext4_mark_super_dirty(struct super_block *sb)
2024{
2025 if (EXT4_SB(sb)->s_journal == NULL)
2026 sb->s_dirt =1;
2027}
2028
2029
2030
2031
2032
2033
2034extern const struct file_operations ext4_dir_operations;
2035
2036
2037extern const struct inode_operations ext4_file_inode_operations;
2038extern const struct file_operations ext4_file_operations;
2039extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2040
2041
2042extern const struct inode_operations ext4_dir_inode_operations;
2043extern const struct inode_operations ext4_special_inode_operations;
2044extern struct dentry *ext4_get_parent(struct dentry *child);
2045
2046
2047extern const struct inode_operations ext4_symlink_inode_operations;
2048extern const struct inode_operations ext4_fast_symlink_inode_operations;
2049
2050
2051extern void ext4_release_system_zone(struct super_block *sb);
2052extern int ext4_setup_system_zone(struct super_block *sb);
2053extern int __init ext4_init_system_zone(void);
2054extern void ext4_exit_system_zone(void);
2055extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2056 ext4_fsblk_t start_blk,
2057 unsigned int count);
2058
2059
2060extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2061extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2062extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2063 int chunk);
2064extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2065 struct ext4_map_blocks *map, int flags);
2066extern void ext4_ext_truncate(struct inode *);
2067extern void ext4_ext_init(struct super_block *);
2068extern void ext4_ext_release(struct super_block *);
2069extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2070 loff_t len);
2071extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2072 ssize_t len);
2073extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2074 struct ext4_map_blocks *map, int flags);
2075extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2076 __u64 start, __u64 len);
2077
2078extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2079 __u64 start_orig, __u64 start_donor,
2080 __u64 len, __u64 *moved_len);
2081
2082
2083extern int __init ext4_init_pageio(void);
2084extern void ext4_exit_pageio(void);
2085extern void ext4_ioend_wait(struct inode *);
2086extern void ext4_free_io_end(ext4_io_end_t *io);
2087extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2088extern int ext4_end_io_nolock(ext4_io_end_t *io);
2089extern void ext4_io_submit(struct ext4_io_submit *io);
2090extern int ext4_bio_write_page(struct ext4_io_submit *io,
2091 struct page *page,
2092 int len,
2093 struct writeback_control *wbc);
2094
2095
2096enum ext4_state_bits {
2097 BH_Uninit
2098 = BH_JBDPrivateStart,
2099};
2100
2101BUFFER_FNS(Uninit, uninit)
2102TAS_BUFFER_FNS(Uninit, uninit)
2103
2104
2105
2106
2107
2108
2109#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2110
2111static inline int bitmap_uptodate(struct buffer_head *bh)
2112{
2113 return (buffer_uptodate(bh) &&
2114 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2115}
2116static inline void set_bitmap_uptodate(struct buffer_head *bh)
2117{
2118 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2119}
2120
2121#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2122
2123
2124#define EXT4_WQ_HASH_SZ 37
2125#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2126 EXT4_WQ_HASH_SZ])
2127#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2128 EXT4_WQ_HASH_SZ])
2129extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2130extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2131
2132#endif
2133
2134#endif
2135