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Fix misspellings of "whether" in comments.
[deliverable/linux.git] / fs / ext4 / ext4.h
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <crypto/hash.h>
33 #ifdef __KERNEL__
34 #include <linux/compat.h>
35 #endif
36
37 /*
38 * The fourth extended filesystem constants/structures
39 */
40
41 /*
42 * Define EXT4FS_DEBUG to produce debug messages
43 */
44 #undef EXT4FS_DEBUG
45
46 /*
47 * Debug code
48 */
49 #ifdef EXT4FS_DEBUG
50 #define ext4_debug(f, a...) \
51 do { \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
55 } while (0)
56 #else
57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
58 #endif
59
60 #define EXT4_ERROR_INODE(inode, fmt, a...) \
61 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
62
63 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
64 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
65
66 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
67 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
68
69 /* data type for block offset of block group */
70 typedef int ext4_grpblk_t;
71
72 /* data type for filesystem-wide blocks number */
73 typedef unsigned long long ext4_fsblk_t;
74
75 /* data type for file logical block number */
76 typedef __u32 ext4_lblk_t;
77
78 /* data type for block group number */
79 typedef unsigned int ext4_group_t;
80
81 /*
82 * Flags used in mballoc's allocation_context flags field.
83 *
84 * Also used to show what's going on for debugging purposes when the
85 * flag field is exported via the traceport interface
86 */
87
88 /* prefer goal again. length */
89 #define EXT4_MB_HINT_MERGE 0x0001
90 /* blocks already reserved */
91 #define EXT4_MB_HINT_RESERVED 0x0002
92 /* metadata is being allocated */
93 #define EXT4_MB_HINT_METADATA 0x0004
94 /* first blocks in the file */
95 #define EXT4_MB_HINT_FIRST 0x0008
96 /* search for the best chunk */
97 #define EXT4_MB_HINT_BEST 0x0010
98 /* data is being allocated */
99 #define EXT4_MB_HINT_DATA 0x0020
100 /* don't preallocate (for tails) */
101 #define EXT4_MB_HINT_NOPREALLOC 0x0040
102 /* allocate for locality group */
103 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
104 /* allocate goal blocks or none */
105 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
106 /* goal is meaningful */
107 #define EXT4_MB_HINT_TRY_GOAL 0x0200
108 /* blocks already pre-reserved by delayed allocation */
109 #define EXT4_MB_DELALLOC_RESERVED 0x0400
110 /* We are doing stream allocation */
111 #define EXT4_MB_STREAM_ALLOC 0x0800
112 /* Use reserved root blocks if needed */
113 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
114
115 struct ext4_allocation_request {
116 /* target inode for block we're allocating */
117 struct inode *inode;
118 /* how many blocks we want to allocate */
119 unsigned int len;
120 /* logical block in target inode */
121 ext4_lblk_t logical;
122 /* the closest logical allocated block to the left */
123 ext4_lblk_t lleft;
124 /* the closest logical allocated block to the right */
125 ext4_lblk_t lright;
126 /* phys. target (a hint) */
127 ext4_fsblk_t goal;
128 /* phys. block for the closest logical allocated block to the left */
129 ext4_fsblk_t pleft;
130 /* phys. block for the closest logical allocated block to the right */
131 ext4_fsblk_t pright;
132 /* flags. see above EXT4_MB_HINT_* */
133 unsigned int flags;
134 };
135
136 /*
137 * Logical to physical block mapping, used by ext4_map_blocks()
138 *
139 * This structure is used to pass requests into ext4_map_blocks() as
140 * well as to store the information returned by ext4_map_blocks(). It
141 * takes less room on the stack than a struct buffer_head.
142 */
143 #define EXT4_MAP_NEW (1 << BH_New)
144 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
145 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
146 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
147 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
148 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
149 * ext4_map_blocks wants to know whether or not the underlying cluster has
150 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
151 * the requested mapping was from previously mapped (or delayed allocated)
152 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
153 * should never appear on buffer_head's state flags.
154 */
155 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
156 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
157 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
158 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
159
160 struct ext4_map_blocks {
161 ext4_fsblk_t m_pblk;
162 ext4_lblk_t m_lblk;
163 unsigned int m_len;
164 unsigned int m_flags;
165 };
166
167 /*
168 * For delayed allocation tracking
169 */
170 struct mpage_da_data {
171 struct inode *inode;
172 sector_t b_blocknr; /* start block number of extent */
173 size_t b_size; /* size of extent */
174 unsigned long b_state; /* state of the extent */
175 unsigned long first_page, next_page; /* extent of pages */
176 struct writeback_control *wbc;
177 int io_done;
178 int pages_written;
179 int retval;
180 };
181
182 /*
183 * Flags for ext4_io_end->flags
184 */
185 #define EXT4_IO_END_UNWRITTEN 0x0001
186 #define EXT4_IO_END_ERROR 0x0002
187 #define EXT4_IO_END_QUEUED 0x0004
188 #define EXT4_IO_END_DIRECT 0x0008
189
190 struct ext4_io_page {
191 struct page *p_page;
192 atomic_t p_count;
193 };
194
195 #define MAX_IO_PAGES 128
196
197 /*
198 * For converting uninitialized extents on a work queue.
199 *
200 * 'page' is only used from the writepage() path; 'pages' is only used for
201 * buffered writes; they are used to keep page references until conversion
202 * takes place. For AIO/DIO, neither field is filled in.
203 */
204 typedef struct ext4_io_end {
205 struct list_head list; /* per-file finished IO list */
206 struct inode *inode; /* file being written to */
207 unsigned int flag; /* unwritten or not */
208 struct page *page; /* for writepage() path */
209 loff_t offset; /* offset in the file */
210 ssize_t size; /* size of the extent */
211 struct work_struct work; /* data work queue */
212 struct kiocb *iocb; /* iocb struct for AIO */
213 int result; /* error value for AIO */
214 int num_io_pages; /* for writepages() */
215 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */
216 } ext4_io_end_t;
217
218 struct ext4_io_submit {
219 int io_op;
220 struct bio *io_bio;
221 ext4_io_end_t *io_end;
222 struct ext4_io_page *io_page;
223 sector_t io_next_block;
224 };
225
226 /*
227 * Special inodes numbers
228 */
229 #define EXT4_BAD_INO 1 /* Bad blocks inode */
230 #define EXT4_ROOT_INO 2 /* Root inode */
231 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
232 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
233 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
234 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
235 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
236 #define EXT4_JOURNAL_INO 8 /* Journal inode */
237
238 /* First non-reserved inode for old ext4 filesystems */
239 #define EXT4_GOOD_OLD_FIRST_INO 11
240
241 /*
242 * Maximal count of links to a file
243 */
244 #define EXT4_LINK_MAX 65000
245
246 /*
247 * Macro-instructions used to manage several block sizes
248 */
249 #define EXT4_MIN_BLOCK_SIZE 1024
250 #define EXT4_MAX_BLOCK_SIZE 65536
251 #define EXT4_MIN_BLOCK_LOG_SIZE 10
252 #define EXT4_MAX_BLOCK_LOG_SIZE 16
253 #ifdef __KERNEL__
254 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
255 #else
256 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
257 #endif
258 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
259 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
260 EXT4_SB(s)->s_cluster_bits)
261 #ifdef __KERNEL__
262 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
263 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
264 #else
265 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
266 #endif
267 #ifdef __KERNEL__
268 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
269 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
270 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
271 #else
272 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
273 EXT4_GOOD_OLD_INODE_SIZE : \
274 (s)->s_inode_size)
275 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
276 EXT4_GOOD_OLD_FIRST_INO : \
277 (s)->s_first_ino)
278 #endif
279 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
280
281 /* Translate a block number to a cluster number */
282 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
283 /* Translate a cluster number to a block number */
284 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
285 /* Translate # of blks to # of clusters */
286 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
287 (sbi)->s_cluster_bits)
288
289 /*
290 * Structure of a blocks group descriptor
291 */
292 struct ext4_group_desc
293 {
294 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
295 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
296 __le32 bg_inode_table_lo; /* Inodes table block */
297 __le16 bg_free_blocks_count_lo;/* Free blocks count */
298 __le16 bg_free_inodes_count_lo;/* Free inodes count */
299 __le16 bg_used_dirs_count_lo; /* Directories count */
300 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
301 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
302 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
303 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
304 __le16 bg_itable_unused_lo; /* Unused inodes count */
305 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
306 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
307 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
308 __le32 bg_inode_table_hi; /* Inodes table block MSB */
309 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
310 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
311 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
312 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
313 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
314 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
315 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
316 __u32 bg_reserved;
317 };
318
319 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
320 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
321 sizeof(__le16))
322 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
323 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
324 sizeof(__le16))
325
326 /*
327 * Structure of a flex block group info
328 */
329
330 struct flex_groups {
331 atomic_t free_inodes;
332 atomic_t free_clusters;
333 atomic_t used_dirs;
334 };
335
336 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
337 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
338 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
339
340 /*
341 * Macro-instructions used to manage group descriptors
342 */
343 #define EXT4_MIN_DESC_SIZE 32
344 #define EXT4_MIN_DESC_SIZE_64BIT 64
345 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
346 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
347 #ifdef __KERNEL__
348 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
349 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
350 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
351 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
352 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
353 #else
354 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
355 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
356 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
357 #endif
358
359 /*
360 * Constants relative to the data blocks
361 */
362 #define EXT4_NDIR_BLOCKS 12
363 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
364 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
365 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
366 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
367
368 /*
369 * Inode flags
370 */
371 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
372 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
373 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
374 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
375 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
376 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
377 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
378 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
379 /* Reserved for compression usage... */
380 #define EXT4_DIRTY_FL 0x00000100
381 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
382 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
383 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
384 /* End compression flags --- maybe not all used */
385 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
386 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
387 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
388 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
389 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
390 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
391 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
392 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
393 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
394 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
395 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
396
397 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
398 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
399
400 /* Flags that should be inherited by new inodes from their parent. */
401 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
402 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
403 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
404 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
405
406 /* Flags that are appropriate for regular files (all but dir-specific ones). */
407 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
408
409 /* Flags that are appropriate for non-directories/regular files. */
410 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
411
412 /* Mask out flags that are inappropriate for the given type of inode. */
413 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
414 {
415 if (S_ISDIR(mode))
416 return flags;
417 else if (S_ISREG(mode))
418 return flags & EXT4_REG_FLMASK;
419 else
420 return flags & EXT4_OTHER_FLMASK;
421 }
422
423 /*
424 * Inode flags used for atomic set/get
425 */
426 enum {
427 EXT4_INODE_SECRM = 0, /* Secure deletion */
428 EXT4_INODE_UNRM = 1, /* Undelete */
429 EXT4_INODE_COMPR = 2, /* Compress file */
430 EXT4_INODE_SYNC = 3, /* Synchronous updates */
431 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
432 EXT4_INODE_APPEND = 5, /* writes to file may only append */
433 EXT4_INODE_NODUMP = 6, /* do not dump file */
434 EXT4_INODE_NOATIME = 7, /* do not update atime */
435 /* Reserved for compression usage... */
436 EXT4_INODE_DIRTY = 8,
437 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
438 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
439 EXT4_INODE_ECOMPR = 11, /* Compression error */
440 /* End compression flags --- maybe not all used */
441 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
442 EXT4_INODE_IMAGIC = 13, /* AFS directory */
443 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
444 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
445 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
446 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
447 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
448 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
449 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
450 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
451 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
452 };
453
454 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
455 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
456 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
457 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
458
459 /*
460 * Since it's pretty easy to mix up bit numbers and hex values, and we
461 * can't do a compile-time test for ENUM values, we use a run-time
462 * test to make sure that EXT4_XXX_FL is consistent with respect to
463 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
464 * out so it won't cost any extra space in the compiled kernel image.
465 * But it's important that these values are the same, since we are
466 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
467 * must be consistent with the values of FS_XXX_FL defined in
468 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
469 * ext4 filesystems, and of course the values defined in e2fsprogs.
470 *
471 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
472 */
473 static inline void ext4_check_flag_values(void)
474 {
475 CHECK_FLAG_VALUE(SECRM);
476 CHECK_FLAG_VALUE(UNRM);
477 CHECK_FLAG_VALUE(COMPR);
478 CHECK_FLAG_VALUE(SYNC);
479 CHECK_FLAG_VALUE(IMMUTABLE);
480 CHECK_FLAG_VALUE(APPEND);
481 CHECK_FLAG_VALUE(NODUMP);
482 CHECK_FLAG_VALUE(NOATIME);
483 CHECK_FLAG_VALUE(DIRTY);
484 CHECK_FLAG_VALUE(COMPRBLK);
485 CHECK_FLAG_VALUE(NOCOMPR);
486 CHECK_FLAG_VALUE(ECOMPR);
487 CHECK_FLAG_VALUE(INDEX);
488 CHECK_FLAG_VALUE(IMAGIC);
489 CHECK_FLAG_VALUE(JOURNAL_DATA);
490 CHECK_FLAG_VALUE(NOTAIL);
491 CHECK_FLAG_VALUE(DIRSYNC);
492 CHECK_FLAG_VALUE(TOPDIR);
493 CHECK_FLAG_VALUE(HUGE_FILE);
494 CHECK_FLAG_VALUE(EXTENTS);
495 CHECK_FLAG_VALUE(EA_INODE);
496 CHECK_FLAG_VALUE(EOFBLOCKS);
497 CHECK_FLAG_VALUE(RESERVED);
498 }
499
500 /* Used to pass group descriptor data when online resize is done */
501 struct ext4_new_group_input {
502 __u32 group; /* Group number for this data */
503 __u64 block_bitmap; /* Absolute block number of block bitmap */
504 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
505 __u64 inode_table; /* Absolute block number of inode table start */
506 __u32 blocks_count; /* Total number of blocks in this group */
507 __u16 reserved_blocks; /* Number of reserved blocks in this group */
508 __u16 unused;
509 };
510
511 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
512 struct compat_ext4_new_group_input {
513 u32 group;
514 compat_u64 block_bitmap;
515 compat_u64 inode_bitmap;
516 compat_u64 inode_table;
517 u32 blocks_count;
518 u16 reserved_blocks;
519 u16 unused;
520 };
521 #endif
522
523 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
524 struct ext4_new_group_data {
525 __u32 group;
526 __u64 block_bitmap;
527 __u64 inode_bitmap;
528 __u64 inode_table;
529 __u32 blocks_count;
530 __u16 reserved_blocks;
531 __u16 unused;
532 __u32 free_blocks_count;
533 };
534
535 /* Indexes used to index group tables in ext4_new_group_data */
536 enum {
537 BLOCK_BITMAP = 0, /* block bitmap */
538 INODE_BITMAP, /* inode bitmap */
539 INODE_TABLE, /* inode tables */
540 GROUP_TABLE_COUNT,
541 };
542
543 /*
544 * Flags used by ext4_map_blocks()
545 */
546 /* Allocate any needed blocks and/or convert an unitialized
547 extent to be an initialized ext4 */
548 #define EXT4_GET_BLOCKS_CREATE 0x0001
549 /* Request the creation of an unitialized extent */
550 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
551 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
552 EXT4_GET_BLOCKS_CREATE)
553 /* Caller is from the delayed allocation writeout path,
554 so set the magic i_delalloc_reserve_flag after taking the
555 inode allocation semaphore for */
556 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
557 /* caller is from the direct IO path, request to creation of an
558 unitialized extents if not allocated, split the uninitialized
559 extent if blocks has been preallocated already*/
560 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
561 #define EXT4_GET_BLOCKS_CONVERT 0x0010
562 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
563 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
564 /* Convert extent to initialized after IO complete */
565 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
566 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
567 /* Punch out blocks of an extent */
568 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
569 /* Don't normalize allocation size (used for fallocate) */
570 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
571 /* Request will not result in inode size update (user for fallocate) */
572 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
573 /* Do not take i_data_sem locking in ext4_map_blocks */
574 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
575
576 /*
577 * Flags used by ext4_free_blocks
578 */
579 #define EXT4_FREE_BLOCKS_METADATA 0x0001
580 #define EXT4_FREE_BLOCKS_FORGET 0x0002
581 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
582 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
583 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
584 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
585
586 /*
587 * Flags used by ext4_discard_partial_page_buffers
588 */
589 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
590
591 /*
592 * ioctl commands
593 */
594 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
595 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
596 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
597 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
598 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
599 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
600 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
601 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
602 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
603 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
604 #define EXT4_IOC_MIGRATE _IO('f', 9)
605 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
606 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
607 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
608 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
609 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
610
611 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
612 /*
613 * ioctl commands in 32 bit emulation
614 */
615 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
616 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
617 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
618 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
619 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
620 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
621 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
622 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
623 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
624 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
625 #endif
626
627 /* Max physical block we can address w/o extents */
628 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
629
630 /*
631 * Structure of an inode on the disk
632 */
633 struct ext4_inode {
634 __le16 i_mode; /* File mode */
635 __le16 i_uid; /* Low 16 bits of Owner Uid */
636 __le32 i_size_lo; /* Size in bytes */
637 __le32 i_atime; /* Access time */
638 __le32 i_ctime; /* Inode Change time */
639 __le32 i_mtime; /* Modification time */
640 __le32 i_dtime; /* Deletion Time */
641 __le16 i_gid; /* Low 16 bits of Group Id */
642 __le16 i_links_count; /* Links count */
643 __le32 i_blocks_lo; /* Blocks count */
644 __le32 i_flags; /* File flags */
645 union {
646 struct {
647 __le32 l_i_version;
648 } linux1;
649 struct {
650 __u32 h_i_translator;
651 } hurd1;
652 struct {
653 __u32 m_i_reserved1;
654 } masix1;
655 } osd1; /* OS dependent 1 */
656 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
657 __le32 i_generation; /* File version (for NFS) */
658 __le32 i_file_acl_lo; /* File ACL */
659 __le32 i_size_high;
660 __le32 i_obso_faddr; /* Obsoleted fragment address */
661 union {
662 struct {
663 __le16 l_i_blocks_high; /* were l_i_reserved1 */
664 __le16 l_i_file_acl_high;
665 __le16 l_i_uid_high; /* these 2 fields */
666 __le16 l_i_gid_high; /* were reserved2[0] */
667 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
668 __le16 l_i_reserved;
669 } linux2;
670 struct {
671 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
672 __u16 h_i_mode_high;
673 __u16 h_i_uid_high;
674 __u16 h_i_gid_high;
675 __u32 h_i_author;
676 } hurd2;
677 struct {
678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
679 __le16 m_i_file_acl_high;
680 __u32 m_i_reserved2[2];
681 } masix2;
682 } osd2; /* OS dependent 2 */
683 __le16 i_extra_isize;
684 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
685 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
686 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
687 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
688 __le32 i_crtime; /* File Creation time */
689 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
690 __le32 i_version_hi; /* high 32 bits for 64-bit version */
691 };
692
693 struct move_extent {
694 __u32 reserved; /* should be zero */
695 __u32 donor_fd; /* donor file descriptor */
696 __u64 orig_start; /* logical start offset in block for orig */
697 __u64 donor_start; /* logical start offset in block for donor */
698 __u64 len; /* block length to be moved */
699 __u64 moved_len; /* moved block length */
700 };
701
702 #define EXT4_EPOCH_BITS 2
703 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
704 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
705
706 /*
707 * Extended fields will fit into an inode if the filesystem was formatted
708 * with large inodes (-I 256 or larger) and there are not currently any EAs
709 * consuming all of the available space. For new inodes we always reserve
710 * enough space for the kernel's known extended fields, but for inodes
711 * created with an old kernel this might not have been the case. None of
712 * the extended inode fields is critical for correct filesystem operation.
713 * This macro checks if a certain field fits in the inode. Note that
714 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
715 */
716 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
717 ((offsetof(typeof(*ext4_inode), field) + \
718 sizeof((ext4_inode)->field)) \
719 <= (EXT4_GOOD_OLD_INODE_SIZE + \
720 (einode)->i_extra_isize)) \
721
722 static inline __le32 ext4_encode_extra_time(struct timespec *time)
723 {
724 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
725 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
726 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
727 }
728
729 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
730 {
731 if (sizeof(time->tv_sec) > 4)
732 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
733 << 32;
734 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
735 }
736
737 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
738 do { \
739 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
740 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
741 (raw_inode)->xtime ## _extra = \
742 ext4_encode_extra_time(&(inode)->xtime); \
743 } while (0)
744
745 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
746 do { \
747 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
748 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
749 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
750 (raw_inode)->xtime ## _extra = \
751 ext4_encode_extra_time(&(einode)->xtime); \
752 } while (0)
753
754 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
755 do { \
756 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
757 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
758 ext4_decode_extra_time(&(inode)->xtime, \
759 raw_inode->xtime ## _extra); \
760 else \
761 (inode)->xtime.tv_nsec = 0; \
762 } while (0)
763
764 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
765 do { \
766 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
767 (einode)->xtime.tv_sec = \
768 (signed)le32_to_cpu((raw_inode)->xtime); \
769 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
770 ext4_decode_extra_time(&(einode)->xtime, \
771 raw_inode->xtime ## _extra); \
772 else \
773 (einode)->xtime.tv_nsec = 0; \
774 } while (0)
775
776 #define i_disk_version osd1.linux1.l_i_version
777
778 #if defined(__KERNEL__) || defined(__linux__)
779 #define i_reserved1 osd1.linux1.l_i_reserved1
780 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
781 #define i_blocks_high osd2.linux2.l_i_blocks_high
782 #define i_uid_low i_uid
783 #define i_gid_low i_gid
784 #define i_uid_high osd2.linux2.l_i_uid_high
785 #define i_gid_high osd2.linux2.l_i_gid_high
786 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
787
788 #elif defined(__GNU__)
789
790 #define i_translator osd1.hurd1.h_i_translator
791 #define i_uid_high osd2.hurd2.h_i_uid_high
792 #define i_gid_high osd2.hurd2.h_i_gid_high
793 #define i_author osd2.hurd2.h_i_author
794
795 #elif defined(__masix__)
796
797 #define i_reserved1 osd1.masix1.m_i_reserved1
798 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
799 #define i_reserved2 osd2.masix2.m_i_reserved2
800
801 #endif /* defined(__KERNEL__) || defined(__linux__) */
802
803 /*
804 * storage for cached extent
805 * If ec_len == 0, then the cache is invalid.
806 * If ec_start == 0, then the cache represents a gap (null mapping)
807 */
808 struct ext4_ext_cache {
809 ext4_fsblk_t ec_start;
810 ext4_lblk_t ec_block;
811 __u32 ec_len; /* must be 32bit to return holes */
812 };
813
814 /*
815 * fourth extended file system inode data in memory
816 */
817 struct ext4_inode_info {
818 __le32 i_data[15]; /* unconverted */
819 __u32 i_dtime;
820 ext4_fsblk_t i_file_acl;
821
822 /*
823 * i_block_group is the number of the block group which contains
824 * this file's inode. Constant across the lifetime of the inode,
825 * it is ued for making block allocation decisions - we try to
826 * place a file's data blocks near its inode block, and new inodes
827 * near to their parent directory's inode.
828 */
829 ext4_group_t i_block_group;
830 ext4_lblk_t i_dir_start_lookup;
831 #if (BITS_PER_LONG < 64)
832 unsigned long i_state_flags; /* Dynamic state flags */
833 #endif
834 unsigned long i_flags;
835
836 #ifdef CONFIG_EXT4_FS_XATTR
837 /*
838 * Extended attributes can be read independently of the main file
839 * data. Taking i_mutex even when reading would cause contention
840 * between readers of EAs and writers of regular file data, so
841 * instead we synchronize on xattr_sem when reading or changing
842 * EAs.
843 */
844 struct rw_semaphore xattr_sem;
845 #endif
846
847 struct list_head i_orphan; /* unlinked but open inodes */
848
849 /*
850 * i_disksize keeps track of what the inode size is ON DISK, not
851 * in memory. During truncate, i_size is set to the new size by
852 * the VFS prior to calling ext4_truncate(), but the filesystem won't
853 * set i_disksize to 0 until the truncate is actually under way.
854 *
855 * The intent is that i_disksize always represents the blocks which
856 * are used by this file. This allows recovery to restart truncate
857 * on orphans if we crash during truncate. We actually write i_disksize
858 * into the on-disk inode when writing inodes out, instead of i_size.
859 *
860 * The only time when i_disksize and i_size may be different is when
861 * a truncate is in progress. The only things which change i_disksize
862 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
863 */
864 loff_t i_disksize;
865
866 /*
867 * i_data_sem is for serialising ext4_truncate() against
868 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
869 * data tree are chopped off during truncate. We can't do that in
870 * ext4 because whenever we perform intermediate commits during
871 * truncate, the inode and all the metadata blocks *must* be in a
872 * consistent state which allows truncation of the orphans to restart
873 * during recovery. Hence we must fix the get_block-vs-truncate race
874 * by other means, so we have i_data_sem.
875 */
876 struct rw_semaphore i_data_sem;
877 struct inode vfs_inode;
878 struct jbd2_inode *jinode;
879
880 struct ext4_ext_cache i_cached_extent;
881 /*
882 * File creation time. Its function is same as that of
883 * struct timespec i_{a,c,m}time in the generic inode.
884 */
885 struct timespec i_crtime;
886
887 /* mballoc */
888 struct list_head i_prealloc_list;
889 spinlock_t i_prealloc_lock;
890
891 /* ialloc */
892 ext4_group_t i_last_alloc_group;
893
894 /* allocation reservation info for delalloc */
895 /* In case of bigalloc, these refer to clusters rather than blocks */
896 unsigned int i_reserved_data_blocks;
897 unsigned int i_reserved_meta_blocks;
898 unsigned int i_allocated_meta_blocks;
899 ext4_lblk_t i_da_metadata_calc_last_lblock;
900 int i_da_metadata_calc_len;
901
902 /* on-disk additional length */
903 __u16 i_extra_isize;
904
905 #ifdef CONFIG_QUOTA
906 /* quota space reservation, managed internally by quota code */
907 qsize_t i_reserved_quota;
908 #endif
909
910 /* completed IOs that might need unwritten extents handling */
911 struct list_head i_completed_io_list;
912 spinlock_t i_completed_io_lock;
913 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
914 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
915
916 spinlock_t i_block_reservation_lock;
917
918 /*
919 * Transactions that contain inode's metadata needed to complete
920 * fsync and fdatasync, respectively.
921 */
922 tid_t i_sync_tid;
923 tid_t i_datasync_tid;
924
925 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
926 __u32 i_csum_seed;
927 };
928
929 /*
930 * File system states
931 */
932 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
933 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
934 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
935
936 /*
937 * Misc. filesystem flags
938 */
939 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
940 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
941 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
942
943 /*
944 * Mount flags
945 */
946 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
947 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
948 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
949 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
950 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
951 #define EXT4_MOUNT_ERRORS_MASK 0x00070
952 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
953 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
954 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
955 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
956 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
957 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
958 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
959 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
960 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
961 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
962 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
963 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
964 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
965 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
966 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
967 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
968 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
969 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
970 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
971 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
972 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
973 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
974 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
975 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
976
977 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
978 specified delalloc */
979
980 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
981 ~EXT4_MOUNT_##opt
982 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
983 EXT4_MOUNT_##opt
984 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
985 EXT4_MOUNT_##opt)
986
987 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
988 ~EXT4_MOUNT2_##opt
989 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
990 EXT4_MOUNT2_##opt
991 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
992 EXT4_MOUNT2_##opt)
993
994 #define ext4_test_and_set_bit __test_and_set_bit_le
995 #define ext4_set_bit __set_bit_le
996 #define ext4_set_bit_atomic ext2_set_bit_atomic
997 #define ext4_test_and_clear_bit __test_and_clear_bit_le
998 #define ext4_clear_bit __clear_bit_le
999 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1000 #define ext4_test_bit test_bit_le
1001 #define ext4_find_next_zero_bit find_next_zero_bit_le
1002 #define ext4_find_next_bit find_next_bit_le
1003
1004 extern void ext4_set_bits(void *bm, int cur, int len);
1005
1006 /*
1007 * Maximal mount counts between two filesystem checks
1008 */
1009 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1010 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1011
1012 /*
1013 * Behaviour when detecting errors
1014 */
1015 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1016 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1017 #define EXT4_ERRORS_PANIC 3 /* Panic */
1018 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1019
1020 /* Metadata checksum algorithm codes */
1021 #define EXT4_CRC32C_CHKSUM 1
1022
1023 /*
1024 * Structure of the super block
1025 */
1026 struct ext4_super_block {
1027 /*00*/ __le32 s_inodes_count; /* Inodes count */
1028 __le32 s_blocks_count_lo; /* Blocks count */
1029 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1030 __le32 s_free_blocks_count_lo; /* Free blocks count */
1031 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1032 __le32 s_first_data_block; /* First Data Block */
1033 __le32 s_log_block_size; /* Block size */
1034 __le32 s_log_cluster_size; /* Allocation cluster size */
1035 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1036 __le32 s_clusters_per_group; /* # Clusters per group */
1037 __le32 s_inodes_per_group; /* # Inodes per group */
1038 __le32 s_mtime; /* Mount time */
1039 /*30*/ __le32 s_wtime; /* Write time */
1040 __le16 s_mnt_count; /* Mount count */
1041 __le16 s_max_mnt_count; /* Maximal mount count */
1042 __le16 s_magic; /* Magic signature */
1043 __le16 s_state; /* File system state */
1044 __le16 s_errors; /* Behaviour when detecting errors */
1045 __le16 s_minor_rev_level; /* minor revision level */
1046 /*40*/ __le32 s_lastcheck; /* time of last check */
1047 __le32 s_checkinterval; /* max. time between checks */
1048 __le32 s_creator_os; /* OS */
1049 __le32 s_rev_level; /* Revision level */
1050 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1051 __le16 s_def_resgid; /* Default gid for reserved blocks */
1052 /*
1053 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1054 *
1055 * Note: the difference between the compatible feature set and
1056 * the incompatible feature set is that if there is a bit set
1057 * in the incompatible feature set that the kernel doesn't
1058 * know about, it should refuse to mount the filesystem.
1059 *
1060 * e2fsck's requirements are more strict; if it doesn't know
1061 * about a feature in either the compatible or incompatible
1062 * feature set, it must abort and not try to meddle with
1063 * things it doesn't understand...
1064 */
1065 __le32 s_first_ino; /* First non-reserved inode */
1066 __le16 s_inode_size; /* size of inode structure */
1067 __le16 s_block_group_nr; /* block group # of this superblock */
1068 __le32 s_feature_compat; /* compatible feature set */
1069 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1070 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1071 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1072 /*78*/ char s_volume_name[16]; /* volume name */
1073 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1074 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1075 /*
1076 * Performance hints. Directory preallocation should only
1077 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1078 */
1079 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1080 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1081 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1082 /*
1083 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1084 */
1085 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1086 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1087 __le32 s_journal_dev; /* device number of journal file */
1088 __le32 s_last_orphan; /* start of list of inodes to delete */
1089 __le32 s_hash_seed[4]; /* HTREE hash seed */
1090 __u8 s_def_hash_version; /* Default hash version to use */
1091 __u8 s_jnl_backup_type;
1092 __le16 s_desc_size; /* size of group descriptor */
1093 /*100*/ __le32 s_default_mount_opts;
1094 __le32 s_first_meta_bg; /* First metablock block group */
1095 __le32 s_mkfs_time; /* When the filesystem was created */
1096 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1097 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1098 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1099 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1100 __le32 s_free_blocks_count_hi; /* Free blocks count */
1101 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1102 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1103 __le32 s_flags; /* Miscellaneous flags */
1104 __le16 s_raid_stride; /* RAID stride */
1105 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1106 __le64 s_mmp_block; /* Block for multi-mount protection */
1107 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1108 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1109 __u8 s_checksum_type; /* metadata checksum algorithm used */
1110 __le16 s_reserved_pad;
1111 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1112 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1113 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1114 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1115 snapshot's future use */
1116 __le32 s_snapshot_list; /* inode number of the head of the
1117 on-disk snapshot list */
1118 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1119 __le32 s_error_count; /* number of fs errors */
1120 __le32 s_first_error_time; /* first time an error happened */
1121 __le32 s_first_error_ino; /* inode involved in first error */
1122 __le64 s_first_error_block; /* block involved of first error */
1123 __u8 s_first_error_func[32]; /* function where the error happened */
1124 __le32 s_first_error_line; /* line number where error happened */
1125 __le32 s_last_error_time; /* most recent time of an error */
1126 __le32 s_last_error_ino; /* inode involved in last error */
1127 __le32 s_last_error_line; /* line number where error happened */
1128 __le64 s_last_error_block; /* block involved of last error */
1129 __u8 s_last_error_func[32]; /* function where the error happened */
1130 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1131 __u8 s_mount_opts[64];
1132 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1133 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1134 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1135 __le32 s_reserved[108]; /* Padding to the end of the block */
1136 __le32 s_checksum; /* crc32c(superblock) */
1137 };
1138
1139 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1140
1141 #ifdef __KERNEL__
1142
1143 /*
1144 * run-time mount flags
1145 */
1146 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1147 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1148
1149 /*
1150 * fourth extended-fs super-block data in memory
1151 */
1152 struct ext4_sb_info {
1153 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1154 unsigned long s_inodes_per_block;/* Number of inodes per block */
1155 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1156 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1157 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1158 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1159 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1160 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1161 ext4_group_t s_groups_count; /* Number of groups in the fs */
1162 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1163 unsigned long s_overhead; /* # of fs overhead clusters */
1164 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1165 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1166 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1167 struct buffer_head * s_sbh; /* Buffer containing the super block */
1168 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1169 struct buffer_head **s_group_desc;
1170 unsigned int s_mount_opt;
1171 unsigned int s_mount_opt2;
1172 unsigned int s_mount_flags;
1173 unsigned int s_def_mount_opt;
1174 ext4_fsblk_t s_sb_block;
1175 kuid_t s_resuid;
1176 kgid_t s_resgid;
1177 unsigned short s_mount_state;
1178 unsigned short s_pad;
1179 int s_addr_per_block_bits;
1180 int s_desc_per_block_bits;
1181 int s_inode_size;
1182 int s_first_ino;
1183 unsigned int s_inode_readahead_blks;
1184 unsigned int s_inode_goal;
1185 spinlock_t s_next_gen_lock;
1186 u32 s_next_generation;
1187 u32 s_hash_seed[4];
1188 int s_def_hash_version;
1189 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1190 struct percpu_counter s_freeclusters_counter;
1191 struct percpu_counter s_freeinodes_counter;
1192 struct percpu_counter s_dirs_counter;
1193 struct percpu_counter s_dirtyclusters_counter;
1194 struct blockgroup_lock *s_blockgroup_lock;
1195 struct proc_dir_entry *s_proc;
1196 struct kobject s_kobj;
1197 struct completion s_kobj_unregister;
1198 struct super_block *s_sb;
1199
1200 /* Journaling */
1201 struct journal_s *s_journal;
1202 struct list_head s_orphan;
1203 struct mutex s_orphan_lock;
1204 unsigned long s_resize_flags; /* Flags indicating if there
1205 is a resizer */
1206 unsigned long s_commit_interval;
1207 u32 s_max_batch_time;
1208 u32 s_min_batch_time;
1209 struct block_device *journal_bdev;
1210 #ifdef CONFIG_QUOTA
1211 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1212 int s_jquota_fmt; /* Format of quota to use */
1213 #endif
1214 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1215 struct rb_root system_blks;
1216
1217 #ifdef EXTENTS_STATS
1218 /* ext4 extents stats */
1219 unsigned long s_ext_min;
1220 unsigned long s_ext_max;
1221 unsigned long s_depth_max;
1222 spinlock_t s_ext_stats_lock;
1223 unsigned long s_ext_blocks;
1224 unsigned long s_ext_extents;
1225 #endif
1226
1227 /* for buddy allocator */
1228 struct ext4_group_info ***s_group_info;
1229 struct inode *s_buddy_cache;
1230 spinlock_t s_md_lock;
1231 unsigned short *s_mb_offsets;
1232 unsigned int *s_mb_maxs;
1233 unsigned int s_group_info_size;
1234
1235 /* tunables */
1236 unsigned long s_stripe;
1237 unsigned int s_mb_stream_request;
1238 unsigned int s_mb_max_to_scan;
1239 unsigned int s_mb_min_to_scan;
1240 unsigned int s_mb_stats;
1241 unsigned int s_mb_order2_reqs;
1242 unsigned int s_mb_group_prealloc;
1243 unsigned int s_max_writeback_mb_bump;
1244 unsigned int s_max_dir_size_kb;
1245 /* where last allocation was done - for stream allocation */
1246 unsigned long s_mb_last_group;
1247 unsigned long s_mb_last_start;
1248
1249 /* stats for buddy allocator */
1250 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1251 atomic_t s_bal_success; /* we found long enough chunks */
1252 atomic_t s_bal_allocated; /* in blocks */
1253 atomic_t s_bal_ex_scanned; /* total extents scanned */
1254 atomic_t s_bal_goals; /* goal hits */
1255 atomic_t s_bal_breaks; /* too long searches */
1256 atomic_t s_bal_2orders; /* 2^order hits */
1257 spinlock_t s_bal_lock;
1258 unsigned long s_mb_buddies_generated;
1259 unsigned long long s_mb_generation_time;
1260 atomic_t s_mb_lost_chunks;
1261 atomic_t s_mb_preallocated;
1262 atomic_t s_mb_discarded;
1263 atomic_t s_lock_busy;
1264
1265 /* locality groups */
1266 struct ext4_locality_group __percpu *s_locality_groups;
1267
1268 /* for write statistics */
1269 unsigned long s_sectors_written_start;
1270 u64 s_kbytes_written;
1271
1272 /* the size of zero-out chunk */
1273 unsigned int s_extent_max_zeroout_kb;
1274
1275 unsigned int s_log_groups_per_flex;
1276 struct flex_groups *s_flex_groups;
1277 ext4_group_t s_flex_groups_allocated;
1278
1279 /* workqueue for dio unwritten */
1280 struct workqueue_struct *dio_unwritten_wq;
1281
1282 /* timer for periodic error stats printing */
1283 struct timer_list s_err_report;
1284
1285 /* Lazy inode table initialization info */
1286 struct ext4_li_request *s_li_request;
1287 /* Wait multiplier for lazy initialization thread */
1288 unsigned int s_li_wait_mult;
1289
1290 /* Kernel thread for multiple mount protection */
1291 struct task_struct *s_mmp_tsk;
1292
1293 /* record the last minlen when FITRIM is called. */
1294 atomic_t s_last_trim_minblks;
1295
1296 /* Reference to checksum algorithm driver via cryptoapi */
1297 struct crypto_shash *s_chksum_driver;
1298
1299 /* Precomputed FS UUID checksum for seeding other checksums */
1300 __u32 s_csum_seed;
1301 };
1302
1303 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1304 {
1305 return sb->s_fs_info;
1306 }
1307 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1308 {
1309 return container_of(inode, struct ext4_inode_info, vfs_inode);
1310 }
1311
1312 static inline struct timespec ext4_current_time(struct inode *inode)
1313 {
1314 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1315 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1316 }
1317
1318 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1319 {
1320 return ino == EXT4_ROOT_INO ||
1321 ino == EXT4_USR_QUOTA_INO ||
1322 ino == EXT4_GRP_QUOTA_INO ||
1323 ino == EXT4_JOURNAL_INO ||
1324 ino == EXT4_RESIZE_INO ||
1325 (ino >= EXT4_FIRST_INO(sb) &&
1326 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1327 }
1328
1329 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1330 struct ext4_io_end *io_end)
1331 {
1332 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1333 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1334 atomic_inc(&EXT4_I(inode)->i_unwritten);
1335 }
1336 }
1337
1338 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1339 {
1340 return inode->i_private;
1341 }
1342
1343 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1344 {
1345 inode->i_private = io;
1346 }
1347
1348 /*
1349 * Inode dynamic state flags
1350 */
1351 enum {
1352 EXT4_STATE_JDATA, /* journaled data exists */
1353 EXT4_STATE_NEW, /* inode is newly created */
1354 EXT4_STATE_XATTR, /* has in-inode xattrs */
1355 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1356 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1357 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1358 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1359 EXT4_STATE_NEWENTRY, /* File just added to dir */
1360 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1361 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1362 nolocking */
1363 };
1364
1365 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1366 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1367 { \
1368 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1369 } \
1370 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1371 { \
1372 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1373 } \
1374 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1375 { \
1376 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1377 }
1378
1379 EXT4_INODE_BIT_FNS(flag, flags, 0)
1380 #if (BITS_PER_LONG < 64)
1381 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1382
1383 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1384 {
1385 (ei)->i_state_flags = 0;
1386 }
1387 #else
1388 EXT4_INODE_BIT_FNS(state, flags, 32)
1389
1390 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1391 {
1392 /* We depend on the fact that callers will set i_flags */
1393 }
1394 #endif
1395 #else
1396 /* Assume that user mode programs are passing in an ext4fs superblock, not
1397 * a kernel struct super_block. This will allow us to call the feature-test
1398 * macros from user land. */
1399 #define EXT4_SB(sb) (sb)
1400 #endif
1401
1402 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1403
1404 /*
1405 * Codes for operating systems
1406 */
1407 #define EXT4_OS_LINUX 0
1408 #define EXT4_OS_HURD 1
1409 #define EXT4_OS_MASIX 2
1410 #define EXT4_OS_FREEBSD 3
1411 #define EXT4_OS_LITES 4
1412
1413 /*
1414 * Revision levels
1415 */
1416 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1417 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1418
1419 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1420 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1421
1422 #define EXT4_GOOD_OLD_INODE_SIZE 128
1423
1424 /*
1425 * Feature set definitions
1426 */
1427
1428 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1429 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1430 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1431 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1432 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1433 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1434 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1435 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1436 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1437 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1438 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1439 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1440 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1441 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1442 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1443 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1444 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1445 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1446
1447 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1448 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1449 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1450 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1451 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1452 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1453
1454 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1455 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1456 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1457 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1458 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1459 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1460 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1461 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1462 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1463 /*
1464 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1465 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1466 * all other data structures' checksums. However, the METADATA_CSUM and
1467 * GDT_CSUM bits are mutually exclusive.
1468 */
1469 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1470
1471 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1472 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1473 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1474 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1475 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1476 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1477 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1478 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1479 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1480 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1481 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1482 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1483 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1484 #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */
1485
1486 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1487 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1488 EXT4_FEATURE_INCOMPAT_META_BG)
1489 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1490 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1491 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1492
1493 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1494 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1495 EXT4_FEATURE_INCOMPAT_RECOVER| \
1496 EXT4_FEATURE_INCOMPAT_META_BG)
1497 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1498 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1499 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1500
1501 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1502 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1503 EXT4_FEATURE_INCOMPAT_RECOVER| \
1504 EXT4_FEATURE_INCOMPAT_META_BG| \
1505 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1506 EXT4_FEATURE_INCOMPAT_64BIT| \
1507 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1508 EXT4_FEATURE_INCOMPAT_MMP)
1509 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1510 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1511 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1512 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1513 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1514 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1515 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1516 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1517 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1518 EXT4_FEATURE_RO_COMPAT_QUOTA)
1519
1520 /*
1521 * Default values for user and/or group using reserved blocks
1522 */
1523 #define EXT4_DEF_RESUID 0
1524 #define EXT4_DEF_RESGID 0
1525
1526 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1527
1528 /*
1529 * Default mount options
1530 */
1531 #define EXT4_DEFM_DEBUG 0x0001
1532 #define EXT4_DEFM_BSDGROUPS 0x0002
1533 #define EXT4_DEFM_XATTR_USER 0x0004
1534 #define EXT4_DEFM_ACL 0x0008
1535 #define EXT4_DEFM_UID16 0x0010
1536 #define EXT4_DEFM_JMODE 0x0060
1537 #define EXT4_DEFM_JMODE_DATA 0x0020
1538 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1539 #define EXT4_DEFM_JMODE_WBACK 0x0060
1540 #define EXT4_DEFM_NOBARRIER 0x0100
1541 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1542 #define EXT4_DEFM_DISCARD 0x0400
1543 #define EXT4_DEFM_NODELALLOC 0x0800
1544
1545 /*
1546 * Default journal batch times
1547 */
1548 #define EXT4_DEF_MIN_BATCH_TIME 0
1549 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1550
1551 /*
1552 * Minimum number of groups in a flexgroup before we separate out
1553 * directories into the first block group of a flexgroup
1554 */
1555 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1556
1557 /*
1558 * Structure of a directory entry
1559 */
1560 #define EXT4_NAME_LEN 255
1561
1562 struct ext4_dir_entry {
1563 __le32 inode; /* Inode number */
1564 __le16 rec_len; /* Directory entry length */
1565 __le16 name_len; /* Name length */
1566 char name[EXT4_NAME_LEN]; /* File name */
1567 };
1568
1569 /*
1570 * The new version of the directory entry. Since EXT4 structures are
1571 * stored in intel byte order, and the name_len field could never be
1572 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1573 * file_type field.
1574 */
1575 struct ext4_dir_entry_2 {
1576 __le32 inode; /* Inode number */
1577 __le16 rec_len; /* Directory entry length */
1578 __u8 name_len; /* Name length */
1579 __u8 file_type;
1580 char name[EXT4_NAME_LEN]; /* File name */
1581 };
1582
1583 /*
1584 * This is a bogus directory entry at the end of each leaf block that
1585 * records checksums.
1586 */
1587 struct ext4_dir_entry_tail {
1588 __le32 det_reserved_zero1; /* Pretend to be unused */
1589 __le16 det_rec_len; /* 12 */
1590 __u8 det_reserved_zero2; /* Zero name length */
1591 __u8 det_reserved_ft; /* 0xDE, fake file type */
1592 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1593 };
1594
1595 /*
1596 * Ext4 directory file types. Only the low 3 bits are used. The
1597 * other bits are reserved for now.
1598 */
1599 #define EXT4_FT_UNKNOWN 0
1600 #define EXT4_FT_REG_FILE 1
1601 #define EXT4_FT_DIR 2
1602 #define EXT4_FT_CHRDEV 3
1603 #define EXT4_FT_BLKDEV 4
1604 #define EXT4_FT_FIFO 5
1605 #define EXT4_FT_SOCK 6
1606 #define EXT4_FT_SYMLINK 7
1607
1608 #define EXT4_FT_MAX 8
1609
1610 #define EXT4_FT_DIR_CSUM 0xDE
1611
1612 /*
1613 * EXT4_DIR_PAD defines the directory entries boundaries
1614 *
1615 * NOTE: It must be a multiple of 4
1616 */
1617 #define EXT4_DIR_PAD 4
1618 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1619 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1620 ~EXT4_DIR_ROUND)
1621 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1622
1623 /*
1624 * If we ever get support for fs block sizes > page_size, we'll need
1625 * to remove the #if statements in the next two functions...
1626 */
1627 static inline unsigned int
1628 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1629 {
1630 unsigned len = le16_to_cpu(dlen);
1631
1632 #if (PAGE_CACHE_SIZE >= 65536)
1633 if (len == EXT4_MAX_REC_LEN || len == 0)
1634 return blocksize;
1635 return (len & 65532) | ((len & 3) << 16);
1636 #else
1637 return len;
1638 #endif
1639 }
1640
1641 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1642 {
1643 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1644 BUG();
1645 #if (PAGE_CACHE_SIZE >= 65536)
1646 if (len < 65536)
1647 return cpu_to_le16(len);
1648 if (len == blocksize) {
1649 if (blocksize == 65536)
1650 return cpu_to_le16(EXT4_MAX_REC_LEN);
1651 else
1652 return cpu_to_le16(0);
1653 }
1654 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1655 #else
1656 return cpu_to_le16(len);
1657 #endif
1658 }
1659
1660 /*
1661 * Hash Tree Directory indexing
1662 * (c) Daniel Phillips, 2001
1663 */
1664
1665 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1666 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1667 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1668 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1669 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1670
1671 /* Legal values for the dx_root hash_version field: */
1672
1673 #define DX_HASH_LEGACY 0
1674 #define DX_HASH_HALF_MD4 1
1675 #define DX_HASH_TEA 2
1676 #define DX_HASH_LEGACY_UNSIGNED 3
1677 #define DX_HASH_HALF_MD4_UNSIGNED 4
1678 #define DX_HASH_TEA_UNSIGNED 5
1679
1680 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1681 const void *address, unsigned int length)
1682 {
1683 struct {
1684 struct shash_desc shash;
1685 char ctx[4];
1686 } desc;
1687 int err;
1688
1689 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1690
1691 desc.shash.tfm = sbi->s_chksum_driver;
1692 desc.shash.flags = 0;
1693 *(u32 *)desc.ctx = crc;
1694
1695 err = crypto_shash_update(&desc.shash, address, length);
1696 BUG_ON(err);
1697
1698 return *(u32 *)desc.ctx;
1699 }
1700
1701 #ifdef __KERNEL__
1702
1703 /* hash info structure used by the directory hash */
1704 struct dx_hash_info
1705 {
1706 u32 hash;
1707 u32 minor_hash;
1708 int hash_version;
1709 u32 *seed;
1710 };
1711
1712
1713 /* 32 and 64 bit signed EOF for dx directories */
1714 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1715 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1716
1717
1718 /*
1719 * Control parameters used by ext4_htree_next_block
1720 */
1721 #define HASH_NB_ALWAYS 1
1722
1723
1724 /*
1725 * Describe an inode's exact location on disk and in memory
1726 */
1727 struct ext4_iloc
1728 {
1729 struct buffer_head *bh;
1730 unsigned long offset;
1731 ext4_group_t block_group;
1732 };
1733
1734 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1735 {
1736 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1737 }
1738
1739 /*
1740 * This structure is stuffed into the struct file's private_data field
1741 * for directories. It is where we put information so that we can do
1742 * readdir operations in hash tree order.
1743 */
1744 struct dir_private_info {
1745 struct rb_root root;
1746 struct rb_node *curr_node;
1747 struct fname *extra_fname;
1748 loff_t last_pos;
1749 __u32 curr_hash;
1750 __u32 curr_minor_hash;
1751 __u32 next_hash;
1752 };
1753
1754 /* calculate the first block number of the group */
1755 static inline ext4_fsblk_t
1756 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1757 {
1758 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1759 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1760 }
1761
1762 /*
1763 * Special error return code only used by dx_probe() and its callers.
1764 */
1765 #define ERR_BAD_DX_DIR -75000
1766
1767 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1768 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1769
1770 /*
1771 * Timeout and state flag for lazy initialization inode thread.
1772 */
1773 #define EXT4_DEF_LI_WAIT_MULT 10
1774 #define EXT4_DEF_LI_MAX_START_DELAY 5
1775 #define EXT4_LAZYINIT_QUIT 0x0001
1776 #define EXT4_LAZYINIT_RUNNING 0x0002
1777
1778 /*
1779 * Lazy inode table initialization info
1780 */
1781 struct ext4_lazy_init {
1782 unsigned long li_state;
1783 struct list_head li_request_list;
1784 struct mutex li_list_mtx;
1785 };
1786
1787 struct ext4_li_request {
1788 struct super_block *lr_super;
1789 struct ext4_sb_info *lr_sbi;
1790 ext4_group_t lr_next_group;
1791 struct list_head lr_request;
1792 unsigned long lr_next_sched;
1793 unsigned long lr_timeout;
1794 };
1795
1796 struct ext4_features {
1797 struct kobject f_kobj;
1798 struct completion f_kobj_unregister;
1799 };
1800
1801 /*
1802 * This structure will be used for multiple mount protection. It will be
1803 * written into the block number saved in the s_mmp_block field in the
1804 * superblock. Programs that check MMP should assume that if
1805 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1806 * to use the filesystem, regardless of how old the timestamp is.
1807 */
1808 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1809 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1810 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1811 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1812
1813 struct mmp_struct {
1814 __le32 mmp_magic; /* Magic number for MMP */
1815 __le32 mmp_seq; /* Sequence no. updated periodically */
1816
1817 /*
1818 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1819 * purposes and do not affect the correctness of the algorithm
1820 */
1821 __le64 mmp_time; /* Time last updated */
1822 char mmp_nodename[64]; /* Node which last updated MMP block */
1823 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1824
1825 /*
1826 * mmp_check_interval is used to verify if the MMP block has been
1827 * updated on the block device. The value is updated based on the
1828 * maximum time to write the MMP block during an update cycle.
1829 */
1830 __le16 mmp_check_interval;
1831
1832 __le16 mmp_pad1;
1833 __le32 mmp_pad2[226];
1834 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1835 };
1836
1837 /* arguments passed to the mmp thread */
1838 struct mmpd_data {
1839 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1840 struct super_block *sb; /* super block of the fs */
1841 };
1842
1843 /*
1844 * Check interval multiplier
1845 * The MMP block is written every update interval and initially checked every
1846 * update interval x the multiplier (the value is then adapted based on the
1847 * write latency). The reason is that writes can be delayed under load and we
1848 * don't want readers to incorrectly assume that the filesystem is no longer
1849 * in use.
1850 */
1851 #define EXT4_MMP_CHECK_MULT 2UL
1852
1853 /*
1854 * Minimum interval for MMP checking in seconds.
1855 */
1856 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1857
1858 /*
1859 * Maximum interval for MMP checking in seconds.
1860 */
1861 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1862
1863 /*
1864 * Function prototypes
1865 */
1866
1867 /*
1868 * Ok, these declarations are also in <linux/kernel.h> but none of the
1869 * ext4 source programs needs to include it so they are duplicated here.
1870 */
1871 # define NORET_TYPE /**/
1872 # define ATTRIB_NORET __attribute__((noreturn))
1873 # define NORET_AND noreturn,
1874
1875 /* bitmap.c */
1876 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1877 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1878 struct ext4_group_desc *gdp,
1879 struct buffer_head *bh, int sz);
1880 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1881 struct ext4_group_desc *gdp,
1882 struct buffer_head *bh, int sz);
1883 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1884 struct ext4_group_desc *gdp,
1885 struct buffer_head *bh);
1886 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1887 struct ext4_group_desc *gdp,
1888 struct buffer_head *bh);
1889
1890 /* balloc.c */
1891 extern void ext4_validate_block_bitmap(struct super_block *sb,
1892 struct ext4_group_desc *desc,
1893 unsigned int block_group,
1894 struct buffer_head *bh);
1895 extern unsigned int ext4_block_group(struct super_block *sb,
1896 ext4_fsblk_t blocknr);
1897 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1898 ext4_fsblk_t blocknr);
1899 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1900 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1901 ext4_group_t group);
1902 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1903 ext4_fsblk_t goal,
1904 unsigned int flags,
1905 unsigned long *count,
1906 int *errp);
1907 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1908 s64 nclusters, unsigned int flags);
1909 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1910 extern void ext4_check_blocks_bitmap(struct super_block *);
1911 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1912 ext4_group_t block_group,
1913 struct buffer_head ** bh);
1914 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1915
1916 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1917 ext4_group_t block_group);
1918 extern int ext4_wait_block_bitmap(struct super_block *sb,
1919 ext4_group_t block_group,
1920 struct buffer_head *bh);
1921 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1922 ext4_group_t block_group);
1923 extern void ext4_init_block_bitmap(struct super_block *sb,
1924 struct buffer_head *bh,
1925 ext4_group_t group,
1926 struct ext4_group_desc *desc);
1927 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1928 ext4_group_t block_group,
1929 struct ext4_group_desc *gdp);
1930 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1931 ext4_group_t block_group,
1932 struct ext4_group_desc *gdp);
1933 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1934
1935 /* dir.c */
1936 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1937 struct file *,
1938 struct ext4_dir_entry_2 *,
1939 struct buffer_head *, unsigned int);
1940 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1941 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1942 (de), (bh), (offset)))
1943 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1944 __u32 minor_hash,
1945 struct ext4_dir_entry_2 *dirent);
1946 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1947
1948 /* fsync.c */
1949 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1950 extern int ext4_flush_unwritten_io(struct inode *);
1951
1952 /* hash.c */
1953 extern int ext4fs_dirhash(const char *name, int len, struct
1954 dx_hash_info *hinfo);
1955
1956 /* ialloc.c */
1957 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
1958 const struct qstr *qstr, __u32 goal,
1959 uid_t *owner);
1960 extern void ext4_free_inode(handle_t *, struct inode *);
1961 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1962 extern unsigned long ext4_count_free_inodes(struct super_block *);
1963 extern unsigned long ext4_count_dirs(struct super_block *);
1964 extern void ext4_check_inodes_bitmap(struct super_block *);
1965 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1966 extern int ext4_init_inode_table(struct super_block *sb,
1967 ext4_group_t group, int barrier);
1968 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
1969
1970 /* mballoc.c */
1971 extern long ext4_mb_stats;
1972 extern long ext4_mb_max_to_scan;
1973 extern int ext4_mb_init(struct super_block *);
1974 extern int ext4_mb_release(struct super_block *);
1975 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1976 struct ext4_allocation_request *, int *);
1977 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1978 extern void ext4_discard_preallocations(struct inode *);
1979 extern int __init ext4_init_mballoc(void);
1980 extern void ext4_exit_mballoc(void);
1981 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1982 struct buffer_head *bh, ext4_fsblk_t block,
1983 unsigned long count, int flags);
1984 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
1985 ext4_group_t ngroups);
1986 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1987 ext4_group_t i, struct ext4_group_desc *desc);
1988 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1989 ext4_fsblk_t block, unsigned long count);
1990 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1991
1992 /* inode.c */
1993 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1994 ext4_lblk_t, int, int *);
1995 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1996 ext4_lblk_t, int, int *);
1997 int ext4_get_block(struct inode *inode, sector_t iblock,
1998 struct buffer_head *bh_result, int create);
1999
2000 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2001 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2002 extern int ext4_setattr(struct dentry *, struct iattr *);
2003 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2004 struct kstat *stat);
2005 extern void ext4_evict_inode(struct inode *);
2006 extern void ext4_clear_inode(struct inode *);
2007 extern int ext4_sync_inode(handle_t *, struct inode *);
2008 extern void ext4_dirty_inode(struct inode *, int);
2009 extern int ext4_change_inode_journal_flag(struct inode *, int);
2010 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2011 extern int ext4_can_truncate(struct inode *inode);
2012 extern void ext4_truncate(struct inode *);
2013 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2014 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2015 extern void ext4_set_inode_flags(struct inode *);
2016 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2017 extern int ext4_alloc_da_blocks(struct inode *inode);
2018 extern void ext4_set_aops(struct inode *inode);
2019 extern int ext4_writepage_trans_blocks(struct inode *);
2020 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2021 extern int ext4_discard_partial_page_buffers(handle_t *handle,
2022 struct address_space *mapping, loff_t from,
2023 loff_t length, int flags);
2024 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2025 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2026 extern void ext4_da_update_reserve_space(struct inode *inode,
2027 int used, int quota_claim);
2028
2029 /* indirect.c */
2030 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2031 struct ext4_map_blocks *map, int flags);
2032 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2033 const struct iovec *iov, loff_t offset,
2034 unsigned long nr_segs);
2035 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2036 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
2037 extern void ext4_ind_truncate(struct inode *inode);
2038
2039 /* ioctl.c */
2040 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2041 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2042
2043 /* migrate.c */
2044 extern int ext4_ext_migrate(struct inode *);
2045
2046 /* namei.c */
2047 extern int ext4_dirent_csum_verify(struct inode *inode,
2048 struct ext4_dir_entry *dirent);
2049 extern int ext4_orphan_add(handle_t *, struct inode *);
2050 extern int ext4_orphan_del(handle_t *, struct inode *);
2051 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2052 __u32 start_minor_hash, __u32 *next_hash);
2053
2054 /* resize.c */
2055 extern int ext4_group_add(struct super_block *sb,
2056 struct ext4_new_group_data *input);
2057 extern int ext4_group_extend(struct super_block *sb,
2058 struct ext4_super_block *es,
2059 ext4_fsblk_t n_blocks_count);
2060 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2061
2062 /* super.c */
2063 extern int ext4_calculate_overhead(struct super_block *sb);
2064 extern int ext4_superblock_csum_verify(struct super_block *sb,
2065 struct ext4_super_block *es);
2066 extern void ext4_superblock_csum_set(struct super_block *sb);
2067 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2068 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2069 extern void ext4_kvfree(void *ptr);
2070 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2071 ext4_group_t ngroup);
2072 extern __printf(4, 5)
2073 void __ext4_error(struct super_block *, const char *, unsigned int,
2074 const char *, ...);
2075 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2076 __LINE__, ## message)
2077 extern __printf(5, 6)
2078 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2079 const char *, ...);
2080 extern __printf(5, 6)
2081 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2082 const char *, ...);
2083 extern void __ext4_std_error(struct super_block *, const char *,
2084 unsigned int, int);
2085 extern __printf(4, 5)
2086 void __ext4_abort(struct super_block *, const char *, unsigned int,
2087 const char *, ...);
2088 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2089 __LINE__, ## message)
2090 extern __printf(4, 5)
2091 void __ext4_warning(struct super_block *, const char *, unsigned int,
2092 const char *, ...);
2093 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2094 __LINE__, ## message)
2095 extern __printf(3, 4)
2096 void ext4_msg(struct super_block *, const char *, const char *, ...);
2097 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2098 const char *, unsigned int, const char *);
2099 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2100 __LINE__, msg)
2101 extern __printf(7, 8)
2102 void __ext4_grp_locked_error(const char *, unsigned int,
2103 struct super_block *, ext4_group_t,
2104 unsigned long, ext4_fsblk_t,
2105 const char *, ...);
2106 #define ext4_grp_locked_error(sb, grp, message...) \
2107 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2108 extern void ext4_update_dynamic_rev(struct super_block *sb);
2109 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2110 __u32 compat);
2111 extern int ext4_update_rocompat_feature(handle_t *handle,
2112 struct super_block *sb, __u32 rocompat);
2113 extern int ext4_update_incompat_feature(handle_t *handle,
2114 struct super_block *sb, __u32 incompat);
2115 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2116 struct ext4_group_desc *bg);
2117 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2118 struct ext4_group_desc *bg);
2119 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2120 struct ext4_group_desc *bg);
2121 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2122 struct ext4_group_desc *bg);
2123 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2124 struct ext4_group_desc *bg);
2125 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2126 struct ext4_group_desc *bg);
2127 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2128 struct ext4_group_desc *bg);
2129 extern void ext4_block_bitmap_set(struct super_block *sb,
2130 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2131 extern void ext4_inode_bitmap_set(struct super_block *sb,
2132 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2133 extern void ext4_inode_table_set(struct super_block *sb,
2134 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2135 extern void ext4_free_group_clusters_set(struct super_block *sb,
2136 struct ext4_group_desc *bg,
2137 __u32 count);
2138 extern void ext4_free_inodes_set(struct super_block *sb,
2139 struct ext4_group_desc *bg, __u32 count);
2140 extern void ext4_used_dirs_set(struct super_block *sb,
2141 struct ext4_group_desc *bg, __u32 count);
2142 extern void ext4_itable_unused_set(struct super_block *sb,
2143 struct ext4_group_desc *bg, __u32 count);
2144 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2145 struct ext4_group_desc *gdp);
2146 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2147 struct ext4_group_desc *gdp);
2148
2149 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2150 {
2151 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2152 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2153 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2154 }
2155
2156 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2157 {
2158 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2159 le32_to_cpu(es->s_blocks_count_lo);
2160 }
2161
2162 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2163 {
2164 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2165 le32_to_cpu(es->s_r_blocks_count_lo);
2166 }
2167
2168 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2169 {
2170 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2171 le32_to_cpu(es->s_free_blocks_count_lo);
2172 }
2173
2174 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2175 ext4_fsblk_t blk)
2176 {
2177 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2178 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2179 }
2180
2181 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2182 ext4_fsblk_t blk)
2183 {
2184 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2185 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2186 }
2187
2188 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2189 ext4_fsblk_t blk)
2190 {
2191 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2192 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2193 }
2194
2195 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2196 {
2197 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2198 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2199 le32_to_cpu(raw_inode->i_size_lo);
2200 else
2201 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2202 }
2203
2204 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2205 {
2206 raw_inode->i_size_lo = cpu_to_le32(i_size);
2207 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2208 }
2209
2210 static inline
2211 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2212 ext4_group_t group)
2213 {
2214 struct ext4_group_info ***grp_info;
2215 long indexv, indexh;
2216 grp_info = EXT4_SB(sb)->s_group_info;
2217 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2218 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2219 return grp_info[indexv][indexh];
2220 }
2221
2222 /*
2223 * Reading s_groups_count requires using smp_rmb() afterwards. See
2224 * the locking protocol documented in the comments of ext4_group_add()
2225 * in resize.c
2226 */
2227 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2228 {
2229 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2230
2231 smp_rmb();
2232 return ngroups;
2233 }
2234
2235 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2236 ext4_group_t block_group)
2237 {
2238 return block_group >> sbi->s_log_groups_per_flex;
2239 }
2240
2241 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2242 {
2243 return 1 << sbi->s_log_groups_per_flex;
2244 }
2245
2246 #define ext4_std_error(sb, errno) \
2247 do { \
2248 if ((errno)) \
2249 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2250 } while (0)
2251
2252 #ifdef CONFIG_SMP
2253 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2254 * counters. So we need to make sure we have free clusters more
2255 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2256 */
2257 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2258 #else
2259 #define EXT4_FREECLUSTERS_WATERMARK 0
2260 #endif
2261
2262 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2263 {
2264 /*
2265 * XXX: replace with spinlock if seen contended -bzzz
2266 */
2267 down_write(&EXT4_I(inode)->i_data_sem);
2268 if (newsize > EXT4_I(inode)->i_disksize)
2269 EXT4_I(inode)->i_disksize = newsize;
2270 up_write(&EXT4_I(inode)->i_data_sem);
2271 return ;
2272 }
2273
2274 struct ext4_group_info {
2275 unsigned long bb_state;
2276 struct rb_root bb_free_root;
2277 ext4_grpblk_t bb_first_free; /* first free block */
2278 ext4_grpblk_t bb_free; /* total free blocks */
2279 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2280 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2281 struct list_head bb_prealloc_list;
2282 #ifdef DOUBLE_CHECK
2283 void *bb_bitmap;
2284 #endif
2285 struct rw_semaphore alloc_sem;
2286 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2287 * regions, index is order.
2288 * bb_counters[3] = 5 means
2289 * 5 free 8-block regions. */
2290 };
2291
2292 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2293 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2294
2295 #define EXT4_MB_GRP_NEED_INIT(grp) \
2296 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2297
2298 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2299 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2300 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2301 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2302 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2303 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2304
2305 #define EXT4_MAX_CONTENTION 8
2306 #define EXT4_CONTENTION_THRESHOLD 2
2307
2308 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2309 ext4_group_t group)
2310 {
2311 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2312 }
2313
2314 /*
2315 * Returns true if the filesystem is busy enough that attempts to
2316 * access the block group locks has run into contention.
2317 */
2318 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2319 {
2320 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2321 }
2322
2323 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2324 {
2325 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2326 if (spin_trylock(lock))
2327 /*
2328 * We're able to grab the lock right away, so drop the
2329 * lock contention counter.
2330 */
2331 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2332 else {
2333 /*
2334 * The lock is busy, so bump the contention counter,
2335 * and then wait on the spin lock.
2336 */
2337 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2338 EXT4_MAX_CONTENTION);
2339 spin_lock(lock);
2340 }
2341 }
2342
2343 static inline void ext4_unlock_group(struct super_block *sb,
2344 ext4_group_t group)
2345 {
2346 spin_unlock(ext4_group_lock_ptr(sb, group));
2347 }
2348
2349 /*
2350 * Block validity checking
2351 */
2352 #define ext4_check_indirect_blockref(inode, bh) \
2353 ext4_check_blockref(__func__, __LINE__, inode, \
2354 (__le32 *)(bh)->b_data, \
2355 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2356
2357 #define ext4_ind_check_inode(inode) \
2358 ext4_check_blockref(__func__, __LINE__, inode, \
2359 EXT4_I(inode)->i_data, \
2360 EXT4_NDIR_BLOCKS)
2361
2362 /*
2363 * Inodes and files operations
2364 */
2365
2366 /* dir.c */
2367 extern const struct file_operations ext4_dir_operations;
2368
2369 /* file.c */
2370 extern const struct inode_operations ext4_file_inode_operations;
2371 extern const struct file_operations ext4_file_operations;
2372 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2373 extern void ext4_unwritten_wait(struct inode *inode);
2374
2375 /* namei.c */
2376 extern const struct inode_operations ext4_dir_inode_operations;
2377 extern const struct inode_operations ext4_special_inode_operations;
2378 extern struct dentry *ext4_get_parent(struct dentry *child);
2379
2380 /* symlink.c */
2381 extern const struct inode_operations ext4_symlink_inode_operations;
2382 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2383
2384 /* block_validity */
2385 extern void ext4_release_system_zone(struct super_block *sb);
2386 extern int ext4_setup_system_zone(struct super_block *sb);
2387 extern int __init ext4_init_system_zone(void);
2388 extern void ext4_exit_system_zone(void);
2389 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2390 ext4_fsblk_t start_blk,
2391 unsigned int count);
2392 extern int ext4_check_blockref(const char *, unsigned int,
2393 struct inode *, __le32 *, unsigned int);
2394
2395 /* extents.c */
2396 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2397 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2398 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2399 int chunk);
2400 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2401 struct ext4_map_blocks *map, int flags);
2402 extern void ext4_ext_truncate(struct inode *);
2403 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2404 loff_t length);
2405 extern void ext4_ext_init(struct super_block *);
2406 extern void ext4_ext_release(struct super_block *);
2407 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2408 loff_t len);
2409 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2410 ssize_t len);
2411 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2412 struct ext4_map_blocks *map, int flags);
2413 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2414 __u64 start, __u64 len);
2415 /* move_extent.c */
2416 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2417 __u64 start_orig, __u64 start_donor,
2418 __u64 len, __u64 *moved_len);
2419
2420 /* page-io.c */
2421 extern int __init ext4_init_pageio(void);
2422 extern void ext4_add_complete_io(ext4_io_end_t *io_end);
2423 extern void ext4_exit_pageio(void);
2424 extern void ext4_ioend_wait(struct inode *);
2425 extern void ext4_free_io_end(ext4_io_end_t *io);
2426 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2427 extern void ext4_io_submit(struct ext4_io_submit *io);
2428 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2429 struct page *page,
2430 int len,
2431 struct writeback_control *wbc);
2432
2433 /* mmp.c */
2434 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2435 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2436 extern int ext4_mmp_csum_verify(struct super_block *sb,
2437 struct mmp_struct *mmp);
2438
2439 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2440 enum ext4_state_bits {
2441 BH_Uninit /* blocks are allocated but uninitialized on disk */
2442 = BH_JBDPrivateStart,
2443 BH_AllocFromCluster, /* allocated blocks were part of already
2444 * allocated cluster. Note that this flag will
2445 * never, ever appear in a buffer_head's state
2446 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2447 * this is used. */
2448 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This
2449 * flag is set when ext4_map_blocks is called on a
2450 * delayed allocated block to get its real mapping. */
2451 };
2452
2453 BUFFER_FNS(Uninit, uninit)
2454 TAS_BUFFER_FNS(Uninit, uninit)
2455 BUFFER_FNS(Da_Mapped, da_mapped)
2456
2457 /*
2458 * Add new method to test whether block and inode bitmaps are properly
2459 * initialized. With uninit_bg reading the block from disk is not enough
2460 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2461 */
2462 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2463
2464 static inline int bitmap_uptodate(struct buffer_head *bh)
2465 {
2466 return (buffer_uptodate(bh) &&
2467 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2468 }
2469 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2470 {
2471 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2472 }
2473
2474 /*
2475 * Disable DIO read nolock optimization, so new dioreaders will be forced
2476 * to grab i_mutex
2477 */
2478 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2479 {
2480 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2481 smp_mb();
2482 }
2483 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2484 {
2485 smp_mb();
2486 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2487 }
2488
2489 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2490
2491 /* For ioend & aio unwritten conversion wait queues */
2492 #define EXT4_WQ_HASH_SZ 37
2493 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2494 EXT4_WQ_HASH_SZ])
2495 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2496 EXT4_WQ_HASH_SZ])
2497 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2498 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2499
2500 #define EXT4_RESIZING 0
2501 extern int ext4_resize_begin(struct super_block *sb);
2502 extern void ext4_resize_end(struct super_block *sb);
2503
2504 #endif /* __KERNEL__ */
2505
2506 #include "ext4_extents.h"
2507
2508 #endif /* _EXT4_H */
Linux kernel - Deliverables
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