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ext4: make local functions static
[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 <linux/ratelimit.h>
33 #include <crypto/hash.h>
34 #include <linux/falloc.h>
35 #ifdef __KERNEL__
36 #include <linux/compat.h>
37 #endif
38
39 /*
40 * The fourth extended filesystem constants/structures
41 */
42
43 /*
44 * Define EXT4FS_DEBUG to produce debug messages
45 */
46 #undef EXT4FS_DEBUG
47
48 /*
49 * Debug code
50 */
51 #ifdef EXT4FS_DEBUG
52 #define ext4_debug(f, a...) \
53 do { \
54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
55 __FILE__, __LINE__, __func__); \
56 printk(KERN_DEBUG f, ## a); \
57 } while (0)
58 #else
59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
60 #endif
61
62 /*
63 * Turn on EXT_DEBUG to get lots of info about extents operations.
64 */
65 #define EXT_DEBUG__
66 #ifdef EXT_DEBUG
67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
68 #else
69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
70 #endif
71
72 #define EXT4_ERROR_INODE(inode, fmt, a...) \
73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
74
75 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
77
78 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
80
81 /* data type for block offset of block group */
82 typedef int ext4_grpblk_t;
83
84 /* data type for filesystem-wide blocks number */
85 typedef unsigned long long ext4_fsblk_t;
86
87 /* data type for file logical block number */
88 typedef __u32 ext4_lblk_t;
89
90 /* data type for block group number */
91 typedef unsigned int ext4_group_t;
92
93 /*
94 * Flags used in mballoc's allocation_context flags field.
95 *
96 * Also used to show what's going on for debugging purposes when the
97 * flag field is exported via the traceport interface
98 */
99
100 /* prefer goal again. length */
101 #define EXT4_MB_HINT_MERGE 0x0001
102 /* blocks already reserved */
103 #define EXT4_MB_HINT_RESERVED 0x0002
104 /* metadata is being allocated */
105 #define EXT4_MB_HINT_METADATA 0x0004
106 /* first blocks in the file */
107 #define EXT4_MB_HINT_FIRST 0x0008
108 /* search for the best chunk */
109 #define EXT4_MB_HINT_BEST 0x0010
110 /* data is being allocated */
111 #define EXT4_MB_HINT_DATA 0x0020
112 /* don't preallocate (for tails) */
113 #define EXT4_MB_HINT_NOPREALLOC 0x0040
114 /* allocate for locality group */
115 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
116 /* allocate goal blocks or none */
117 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
118 /* goal is meaningful */
119 #define EXT4_MB_HINT_TRY_GOAL 0x0200
120 /* blocks already pre-reserved by delayed allocation */
121 #define EXT4_MB_DELALLOC_RESERVED 0x0400
122 /* We are doing stream allocation */
123 #define EXT4_MB_STREAM_ALLOC 0x0800
124 /* Use reserved root blocks if needed */
125 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
126 /* Use blocks from reserved pool */
127 #define EXT4_MB_USE_RESERVED 0x2000
128
129 struct ext4_allocation_request {
130 /* target inode for block we're allocating */
131 struct inode *inode;
132 /* how many blocks we want to allocate */
133 unsigned int len;
134 /* logical block in target inode */
135 ext4_lblk_t logical;
136 /* the closest logical allocated block to the left */
137 ext4_lblk_t lleft;
138 /* the closest logical allocated block to the right */
139 ext4_lblk_t lright;
140 /* phys. target (a hint) */
141 ext4_fsblk_t goal;
142 /* phys. block for the closest logical allocated block to the left */
143 ext4_fsblk_t pleft;
144 /* phys. block for the closest logical allocated block to the right */
145 ext4_fsblk_t pright;
146 /* flags. see above EXT4_MB_HINT_* */
147 unsigned int flags;
148 };
149
150 /*
151 * Logical to physical block mapping, used by ext4_map_blocks()
152 *
153 * This structure is used to pass requests into ext4_map_blocks() as
154 * well as to store the information returned by ext4_map_blocks(). It
155 * takes less room on the stack than a struct buffer_head.
156 */
157 #define EXT4_MAP_NEW (1 << BH_New)
158 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
159 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
160 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
161 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
162 * ext4_map_blocks wants to know whether or not the underlying cluster has
163 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
164 * the requested mapping was from previously mapped (or delayed allocated)
165 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
166 * should never appear on buffer_head's state flags.
167 */
168 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
169 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
170 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
171 EXT4_MAP_FROM_CLUSTER)
172
173 struct ext4_map_blocks {
174 ext4_fsblk_t m_pblk;
175 ext4_lblk_t m_lblk;
176 unsigned int m_len;
177 unsigned int m_flags;
178 };
179
180 /*
181 * Flags for ext4_io_end->flags
182 */
183 #define EXT4_IO_END_UNWRITTEN 0x0001
184
185 /*
186 * For converting unwritten extents on a work queue. 'handle' is used for
187 * buffered writeback.
188 */
189 typedef struct ext4_io_end {
190 struct list_head list; /* per-file finished IO list */
191 handle_t *handle; /* handle reserved for extent
192 * conversion */
193 struct inode *inode; /* file being written to */
194 struct bio *bio; /* Linked list of completed
195 * bios covering the extent */
196 unsigned int flag; /* unwritten or not */
197 loff_t offset; /* offset in the file */
198 ssize_t size; /* size of the extent */
199 atomic_t count; /* reference counter */
200 } ext4_io_end_t;
201
202 struct ext4_io_submit {
203 int io_op;
204 struct bio *io_bio;
205 ext4_io_end_t *io_end;
206 sector_t io_next_block;
207 };
208
209 /*
210 * Special inodes numbers
211 */
212 #define EXT4_BAD_INO 1 /* Bad blocks inode */
213 #define EXT4_ROOT_INO 2 /* Root inode */
214 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
215 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
216 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
217 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
218 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
219 #define EXT4_JOURNAL_INO 8 /* Journal inode */
220
221 /* First non-reserved inode for old ext4 filesystems */
222 #define EXT4_GOOD_OLD_FIRST_INO 11
223
224 /*
225 * Maximal count of links to a file
226 */
227 #define EXT4_LINK_MAX 65000
228
229 /*
230 * Macro-instructions used to manage several block sizes
231 */
232 #define EXT4_MIN_BLOCK_SIZE 1024
233 #define EXT4_MAX_BLOCK_SIZE 65536
234 #define EXT4_MIN_BLOCK_LOG_SIZE 10
235 #define EXT4_MAX_BLOCK_LOG_SIZE 16
236 #ifdef __KERNEL__
237 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
238 #else
239 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
240 #endif
241 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
242 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
243 EXT4_SB(s)->s_cluster_bits)
244 #ifdef __KERNEL__
245 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
246 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
247 #else
248 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
249 #endif
250 #ifdef __KERNEL__
251 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
252 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
253 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
254 #else
255 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
256 EXT4_GOOD_OLD_INODE_SIZE : \
257 (s)->s_inode_size)
258 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
259 EXT4_GOOD_OLD_FIRST_INO : \
260 (s)->s_first_ino)
261 #endif
262 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
263
264 /* Translate a block number to a cluster number */
265 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
266 /* Translate a cluster number to a block number */
267 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
268 /* Translate # of blks to # of clusters */
269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
270 (sbi)->s_cluster_bits)
271 /* Mask out the low bits to get the starting block of the cluster */
272 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
273 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
274 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
275 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
276 /* Get the cluster offset */
277 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
278 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
279 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
280 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
281
282 /*
283 * Structure of a blocks group descriptor
284 */
285 struct ext4_group_desc
286 {
287 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
288 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
289 __le32 bg_inode_table_lo; /* Inodes table block */
290 __le16 bg_free_blocks_count_lo;/* Free blocks count */
291 __le16 bg_free_inodes_count_lo;/* Free inodes count */
292 __le16 bg_used_dirs_count_lo; /* Directories count */
293 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
294 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
295 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
296 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
297 __le16 bg_itable_unused_lo; /* Unused inodes count */
298 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
299 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
300 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
301 __le32 bg_inode_table_hi; /* Inodes table block MSB */
302 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
303 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
304 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
305 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
306 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
307 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
308 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
309 __u32 bg_reserved;
310 };
311
312 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
313 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
314 sizeof(__le16))
315 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
316 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
317 sizeof(__le16))
318
319 /*
320 * Structure of a flex block group info
321 */
322
323 struct flex_groups {
324 atomic64_t free_clusters;
325 atomic_t free_inodes;
326 atomic_t used_dirs;
327 };
328
329 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
330 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
331 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
332
333 /*
334 * Macro-instructions used to manage group descriptors
335 */
336 #define EXT4_MIN_DESC_SIZE 32
337 #define EXT4_MIN_DESC_SIZE_64BIT 64
338 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
339 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
340 #ifdef __KERNEL__
341 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
342 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
343 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
344 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
345 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
346 #else
347 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
348 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
349 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
350 #endif
351
352 /*
353 * Constants relative to the data blocks
354 */
355 #define EXT4_NDIR_BLOCKS 12
356 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
357 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
358 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
359 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
360
361 /*
362 * Inode flags
363 */
364 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
365 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
366 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
367 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
368 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
369 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
370 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
371 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
372 /* Reserved for compression usage... */
373 #define EXT4_DIRTY_FL 0x00000100
374 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
375 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
376 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
377 /* End compression flags --- maybe not all used */
378 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
379 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
380 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
381 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
382 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
383 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
384 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
385 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
386 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
387 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
388 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
389 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
390
391 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
392 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
393
394 /* Flags that should be inherited by new inodes from their parent. */
395 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
396 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
397 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
398 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
399
400 /* Flags that are appropriate for regular files (all but dir-specific ones). */
401 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
402
403 /* Flags that are appropriate for non-directories/regular files. */
404 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
405
406 /* Mask out flags that are inappropriate for the given type of inode. */
407 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
408 {
409 if (S_ISDIR(mode))
410 return flags;
411 else if (S_ISREG(mode))
412 return flags & EXT4_REG_FLMASK;
413 else
414 return flags & EXT4_OTHER_FLMASK;
415 }
416
417 /*
418 * Inode flags used for atomic set/get
419 */
420 enum {
421 EXT4_INODE_SECRM = 0, /* Secure deletion */
422 EXT4_INODE_UNRM = 1, /* Undelete */
423 EXT4_INODE_COMPR = 2, /* Compress file */
424 EXT4_INODE_SYNC = 3, /* Synchronous updates */
425 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
426 EXT4_INODE_APPEND = 5, /* writes to file may only append */
427 EXT4_INODE_NODUMP = 6, /* do not dump file */
428 EXT4_INODE_NOATIME = 7, /* do not update atime */
429 /* Reserved for compression usage... */
430 EXT4_INODE_DIRTY = 8,
431 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
432 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
433 EXT4_INODE_ECOMPR = 11, /* Compression error */
434 /* End compression flags --- maybe not all used */
435 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
436 EXT4_INODE_IMAGIC = 13, /* AFS directory */
437 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
438 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
439 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
440 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
441 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
442 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
443 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
444 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
445 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
446 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
447 };
448
449 /*
450 * Since it's pretty easy to mix up bit numbers and hex values, we use a
451 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
452 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
453 * any extra space in the compiled kernel image, otherwise, the build will fail.
454 * It's important that these values are the same, since we are using
455 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
456 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
457 * values found in ext2, ext3 and ext4 filesystems, and of course the values
458 * defined in e2fsprogs.
459 *
460 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
461 */
462 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
463 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
464
465 static inline void ext4_check_flag_values(void)
466 {
467 CHECK_FLAG_VALUE(SECRM);
468 CHECK_FLAG_VALUE(UNRM);
469 CHECK_FLAG_VALUE(COMPR);
470 CHECK_FLAG_VALUE(SYNC);
471 CHECK_FLAG_VALUE(IMMUTABLE);
472 CHECK_FLAG_VALUE(APPEND);
473 CHECK_FLAG_VALUE(NODUMP);
474 CHECK_FLAG_VALUE(NOATIME);
475 CHECK_FLAG_VALUE(DIRTY);
476 CHECK_FLAG_VALUE(COMPRBLK);
477 CHECK_FLAG_VALUE(NOCOMPR);
478 CHECK_FLAG_VALUE(ECOMPR);
479 CHECK_FLAG_VALUE(INDEX);
480 CHECK_FLAG_VALUE(IMAGIC);
481 CHECK_FLAG_VALUE(JOURNAL_DATA);
482 CHECK_FLAG_VALUE(NOTAIL);
483 CHECK_FLAG_VALUE(DIRSYNC);
484 CHECK_FLAG_VALUE(TOPDIR);
485 CHECK_FLAG_VALUE(HUGE_FILE);
486 CHECK_FLAG_VALUE(EXTENTS);
487 CHECK_FLAG_VALUE(EA_INODE);
488 CHECK_FLAG_VALUE(EOFBLOCKS);
489 CHECK_FLAG_VALUE(INLINE_DATA);
490 CHECK_FLAG_VALUE(RESERVED);
491 }
492
493 /* Used to pass group descriptor data when online resize is done */
494 struct ext4_new_group_input {
495 __u32 group; /* Group number for this data */
496 __u64 block_bitmap; /* Absolute block number of block bitmap */
497 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
498 __u64 inode_table; /* Absolute block number of inode table start */
499 __u32 blocks_count; /* Total number of blocks in this group */
500 __u16 reserved_blocks; /* Number of reserved blocks in this group */
501 __u16 unused;
502 };
503
504 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
505 struct compat_ext4_new_group_input {
506 u32 group;
507 compat_u64 block_bitmap;
508 compat_u64 inode_bitmap;
509 compat_u64 inode_table;
510 u32 blocks_count;
511 u16 reserved_blocks;
512 u16 unused;
513 };
514 #endif
515
516 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
517 struct ext4_new_group_data {
518 __u32 group;
519 __u64 block_bitmap;
520 __u64 inode_bitmap;
521 __u64 inode_table;
522 __u32 blocks_count;
523 __u16 reserved_blocks;
524 __u16 unused;
525 __u32 free_blocks_count;
526 };
527
528 /* Indexes used to index group tables in ext4_new_group_data */
529 enum {
530 BLOCK_BITMAP = 0, /* block bitmap */
531 INODE_BITMAP, /* inode bitmap */
532 INODE_TABLE, /* inode tables */
533 GROUP_TABLE_COUNT,
534 };
535
536 /*
537 * Flags used by ext4_map_blocks()
538 */
539 /* Allocate any needed blocks and/or convert an unwritten
540 extent to be an initialized ext4 */
541 #define EXT4_GET_BLOCKS_CREATE 0x0001
542 /* Request the creation of an unwritten extent */
543 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
544 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
545 EXT4_GET_BLOCKS_CREATE)
546 /* Caller is from the delayed allocation writeout path
547 * finally doing the actual allocation of delayed blocks */
548 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
549 /* caller is from the direct IO path, request to creation of an
550 unwritten extents if not allocated, split the unwritten
551 extent if blocks has been preallocated already*/
552 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
553 #define EXT4_GET_BLOCKS_CONVERT 0x0010
554 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
555 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
556 /* Convert extent to initialized after IO complete */
557 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
558 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
559 /* Eventual metadata allocation (due to growing extent tree)
560 * should not fail, so try to use reserved blocks for that.*/
561 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
562 /* Don't normalize allocation size (used for fallocate) */
563 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
564 /* Request will not result in inode size update (user for fallocate) */
565 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
566 /* Do not take i_data_sem locking in ext4_map_blocks */
567 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
568 /* Do not put hole in extent cache */
569 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
570 /* Convert written extents to unwritten */
571 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400
572
573 /*
574 * The bit position of these flags must not overlap with any of the
575 * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(),
576 * read_extent_tree_block(), ext4_split_extent_at(),
577 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
578 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
579 * caching the extents when reading from the extent tree while a
580 * truncate or punch hole operation is in progress.
581 */
582 #define EXT4_EX_NOCACHE 0x0400
583 #define EXT4_EX_FORCE_CACHE 0x0800
584
585 /*
586 * Flags used by ext4_free_blocks
587 */
588 #define EXT4_FREE_BLOCKS_METADATA 0x0001
589 #define EXT4_FREE_BLOCKS_FORGET 0x0002
590 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
591 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
592 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
593 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
594 #define EXT4_FREE_BLOCKS_RESERVE 0x0040
595
596 /*
597 * ioctl commands
598 */
599 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
600 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
601 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
602 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
603 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
604 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
605 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
606 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
607 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
608 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
609 #define EXT4_IOC_MIGRATE _IO('f', 9)
610 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
611 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
612 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
613 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
614 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
615 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
616 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
617
618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
619 /*
620 * ioctl commands in 32 bit emulation
621 */
622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
632 #endif
633
634 /* Max physical block we can address w/o extents */
635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
636
637 /*
638 * Structure of an inode on the disk
639 */
640 struct ext4_inode {
641 __le16 i_mode; /* File mode */
642 __le16 i_uid; /* Low 16 bits of Owner Uid */
643 __le32 i_size_lo; /* Size in bytes */
644 __le32 i_atime; /* Access time */
645 __le32 i_ctime; /* Inode Change time */
646 __le32 i_mtime; /* Modification time */
647 __le32 i_dtime; /* Deletion Time */
648 __le16 i_gid; /* Low 16 bits of Group Id */
649 __le16 i_links_count; /* Links count */
650 __le32 i_blocks_lo; /* Blocks count */
651 __le32 i_flags; /* File flags */
652 union {
653 struct {
654 __le32 l_i_version;
655 } linux1;
656 struct {
657 __u32 h_i_translator;
658 } hurd1;
659 struct {
660 __u32 m_i_reserved1;
661 } masix1;
662 } osd1; /* OS dependent 1 */
663 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
664 __le32 i_generation; /* File version (for NFS) */
665 __le32 i_file_acl_lo; /* File ACL */
666 __le32 i_size_high;
667 __le32 i_obso_faddr; /* Obsoleted fragment address */
668 union {
669 struct {
670 __le16 l_i_blocks_high; /* were l_i_reserved1 */
671 __le16 l_i_file_acl_high;
672 __le16 l_i_uid_high; /* these 2 fields */
673 __le16 l_i_gid_high; /* were reserved2[0] */
674 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
675 __le16 l_i_reserved;
676 } linux2;
677 struct {
678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
679 __u16 h_i_mode_high;
680 __u16 h_i_uid_high;
681 __u16 h_i_gid_high;
682 __u32 h_i_author;
683 } hurd2;
684 struct {
685 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
686 __le16 m_i_file_acl_high;
687 __u32 m_i_reserved2[2];
688 } masix2;
689 } osd2; /* OS dependent 2 */
690 __le16 i_extra_isize;
691 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
692 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
693 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
694 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
695 __le32 i_crtime; /* File Creation time */
696 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
697 __le32 i_version_hi; /* high 32 bits for 64-bit version */
698 };
699
700 struct move_extent {
701 __u32 reserved; /* should be zero */
702 __u32 donor_fd; /* donor file descriptor */
703 __u64 orig_start; /* logical start offset in block for orig */
704 __u64 donor_start; /* logical start offset in block for donor */
705 __u64 len; /* block length to be moved */
706 __u64 moved_len; /* moved block length */
707 };
708
709 #define EXT4_EPOCH_BITS 2
710 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
711 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
712
713 /*
714 * Extended fields will fit into an inode if the filesystem was formatted
715 * with large inodes (-I 256 or larger) and there are not currently any EAs
716 * consuming all of the available space. For new inodes we always reserve
717 * enough space for the kernel's known extended fields, but for inodes
718 * created with an old kernel this might not have been the case. None of
719 * the extended inode fields is critical for correct filesystem operation.
720 * This macro checks if a certain field fits in the inode. Note that
721 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
722 */
723 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
724 ((offsetof(typeof(*ext4_inode), field) + \
725 sizeof((ext4_inode)->field)) \
726 <= (EXT4_GOOD_OLD_INODE_SIZE + \
727 (einode)->i_extra_isize)) \
728
729 static inline __le32 ext4_encode_extra_time(struct timespec *time)
730 {
731 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
732 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
733 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
734 }
735
736 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
737 {
738 if (sizeof(time->tv_sec) > 4)
739 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
740 << 32;
741 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
742 }
743
744 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
745 do { \
746 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
747 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
748 (raw_inode)->xtime ## _extra = \
749 ext4_encode_extra_time(&(inode)->xtime); \
750 } while (0)
751
752 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
753 do { \
754 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
755 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
756 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
757 (raw_inode)->xtime ## _extra = \
758 ext4_encode_extra_time(&(einode)->xtime); \
759 } while (0)
760
761 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
762 do { \
763 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
764 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
765 ext4_decode_extra_time(&(inode)->xtime, \
766 raw_inode->xtime ## _extra); \
767 else \
768 (inode)->xtime.tv_nsec = 0; \
769 } while (0)
770
771 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
772 do { \
773 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
774 (einode)->xtime.tv_sec = \
775 (signed)le32_to_cpu((raw_inode)->xtime); \
776 else \
777 (einode)->xtime.tv_sec = 0; \
778 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
779 ext4_decode_extra_time(&(einode)->xtime, \
780 raw_inode->xtime ## _extra); \
781 else \
782 (einode)->xtime.tv_nsec = 0; \
783 } while (0)
784
785 #define i_disk_version osd1.linux1.l_i_version
786
787 #if defined(__KERNEL__) || defined(__linux__)
788 #define i_reserved1 osd1.linux1.l_i_reserved1
789 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
790 #define i_blocks_high osd2.linux2.l_i_blocks_high
791 #define i_uid_low i_uid
792 #define i_gid_low i_gid
793 #define i_uid_high osd2.linux2.l_i_uid_high
794 #define i_gid_high osd2.linux2.l_i_gid_high
795 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
796
797 #elif defined(__GNU__)
798
799 #define i_translator osd1.hurd1.h_i_translator
800 #define i_uid_high osd2.hurd2.h_i_uid_high
801 #define i_gid_high osd2.hurd2.h_i_gid_high
802 #define i_author osd2.hurd2.h_i_author
803
804 #elif defined(__masix__)
805
806 #define i_reserved1 osd1.masix1.m_i_reserved1
807 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
808 #define i_reserved2 osd2.masix2.m_i_reserved2
809
810 #endif /* defined(__KERNEL__) || defined(__linux__) */
811
812 #include "extents_status.h"
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 /*
837 * Extended attributes can be read independently of the main file
838 * data. Taking i_mutex even when reading would cause contention
839 * between readers of EAs and writers of regular file data, so
840 * instead we synchronize on xattr_sem when reading or changing
841 * EAs.
842 */
843 struct rw_semaphore xattr_sem;
844
845 struct list_head i_orphan; /* unlinked but open inodes */
846
847 /*
848 * i_disksize keeps track of what the inode size is ON DISK, not
849 * in memory. During truncate, i_size is set to the new size by
850 * the VFS prior to calling ext4_truncate(), but the filesystem won't
851 * set i_disksize to 0 until the truncate is actually under way.
852 *
853 * The intent is that i_disksize always represents the blocks which
854 * are used by this file. This allows recovery to restart truncate
855 * on orphans if we crash during truncate. We actually write i_disksize
856 * into the on-disk inode when writing inodes out, instead of i_size.
857 *
858 * The only time when i_disksize and i_size may be different is when
859 * a truncate is in progress. The only things which change i_disksize
860 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
861 */
862 loff_t i_disksize;
863
864 /*
865 * i_data_sem is for serialising ext4_truncate() against
866 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
867 * data tree are chopped off during truncate. We can't do that in
868 * ext4 because whenever we perform intermediate commits during
869 * truncate, the inode and all the metadata blocks *must* be in a
870 * consistent state which allows truncation of the orphans to restart
871 * during recovery. Hence we must fix the get_block-vs-truncate race
872 * by other means, so we have i_data_sem.
873 */
874 struct rw_semaphore i_data_sem;
875 struct inode vfs_inode;
876 struct jbd2_inode *jinode;
877
878 spinlock_t i_raw_lock; /* protects updates to the raw inode */
879
880 /*
881 * File creation time. Its function is same as that of
882 * struct timespec i_{a,c,m}time in the generic inode.
883 */
884 struct timespec i_crtime;
885
886 /* mballoc */
887 struct list_head i_prealloc_list;
888 spinlock_t i_prealloc_lock;
889
890 /* extents status tree */
891 struct ext4_es_tree i_es_tree;
892 rwlock_t i_es_lock;
893 struct list_head i_es_lru;
894 unsigned int i_es_lru_nr; /* protected by i_es_lock */
895 unsigned long i_touch_when; /* jiffies of last accessing */
896
897 /* ialloc */
898 ext4_group_t i_last_alloc_group;
899
900 /* allocation reservation info for delalloc */
901 /* In case of bigalloc, these refer to clusters rather than blocks */
902 unsigned int i_reserved_data_blocks;
903 unsigned int i_reserved_meta_blocks;
904 unsigned int i_allocated_meta_blocks;
905 ext4_lblk_t i_da_metadata_calc_last_lblock;
906 int i_da_metadata_calc_len;
907
908 /* on-disk additional length */
909 __u16 i_extra_isize;
910
911 /* Indicate the inline data space. */
912 u16 i_inline_off;
913 u16 i_inline_size;
914
915 #ifdef CONFIG_QUOTA
916 /* quota space reservation, managed internally by quota code */
917 qsize_t i_reserved_quota;
918 #endif
919
920 /* Lock protecting lists below */
921 spinlock_t i_completed_io_lock;
922 /*
923 * Completed IOs that need unwritten extents handling and have
924 * transaction reserved
925 */
926 struct list_head i_rsv_conversion_list;
927 /*
928 * Completed IOs that need unwritten extents handling and don't have
929 * transaction reserved
930 */
931 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
932 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
933 struct work_struct i_rsv_conversion_work;
934
935 spinlock_t i_block_reservation_lock;
936
937 /*
938 * Transactions that contain inode's metadata needed to complete
939 * fsync and fdatasync, respectively.
940 */
941 tid_t i_sync_tid;
942 tid_t i_datasync_tid;
943
944 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
945 __u32 i_csum_seed;
946 };
947
948 /*
949 * File system states
950 */
951 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
952 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
953 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
954
955 /*
956 * Misc. filesystem flags
957 */
958 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
959 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
960 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
961
962 /*
963 * Mount flags set via mount options or defaults
964 */
965 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
966 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
967 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
968 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
969 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
970 #define EXT4_MOUNT_ERRORS_MASK 0x00070
971 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
972 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
973 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
974 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
975 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
976 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
977 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
978 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
979 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
980 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
981 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
982 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
983 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
984 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
985 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
986 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
987 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
988 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
989 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
990 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
991 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
992 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
993 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
994
995 /*
996 * Mount flags set either automatically (could not be set by mount option)
997 * based on per file system feature or property or in special cases such as
998 * distinguishing between explicit mount option definition and default.
999 */
1000 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1001 specified delalloc */
1002 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1003 size of blocksize * 8
1004 blocks */
1005 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1006 file systems */
1007
1008 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1009 ~EXT4_MOUNT_##opt
1010 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1011 EXT4_MOUNT_##opt
1012 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1013 EXT4_MOUNT_##opt)
1014
1015 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1016 ~EXT4_MOUNT2_##opt
1017 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1018 EXT4_MOUNT2_##opt
1019 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1020 EXT4_MOUNT2_##opt)
1021
1022 #define ext4_test_and_set_bit __test_and_set_bit_le
1023 #define ext4_set_bit __set_bit_le
1024 #define ext4_set_bit_atomic ext2_set_bit_atomic
1025 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1026 #define ext4_clear_bit __clear_bit_le
1027 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1028 #define ext4_test_bit test_bit_le
1029 #define ext4_find_next_zero_bit find_next_zero_bit_le
1030 #define ext4_find_next_bit find_next_bit_le
1031
1032 extern void ext4_set_bits(void *bm, int cur, int len);
1033
1034 /*
1035 * Maximal mount counts between two filesystem checks
1036 */
1037 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1038 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1039
1040 /*
1041 * Behaviour when detecting errors
1042 */
1043 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1044 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1045 #define EXT4_ERRORS_PANIC 3 /* Panic */
1046 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1047
1048 /* Metadata checksum algorithm codes */
1049 #define EXT4_CRC32C_CHKSUM 1
1050
1051 /*
1052 * Structure of the super block
1053 */
1054 struct ext4_super_block {
1055 /*00*/ __le32 s_inodes_count; /* Inodes count */
1056 __le32 s_blocks_count_lo; /* Blocks count */
1057 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1058 __le32 s_free_blocks_count_lo; /* Free blocks count */
1059 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1060 __le32 s_first_data_block; /* First Data Block */
1061 __le32 s_log_block_size; /* Block size */
1062 __le32 s_log_cluster_size; /* Allocation cluster size */
1063 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1064 __le32 s_clusters_per_group; /* # Clusters per group */
1065 __le32 s_inodes_per_group; /* # Inodes per group */
1066 __le32 s_mtime; /* Mount time */
1067 /*30*/ __le32 s_wtime; /* Write time */
1068 __le16 s_mnt_count; /* Mount count */
1069 __le16 s_max_mnt_count; /* Maximal mount count */
1070 __le16 s_magic; /* Magic signature */
1071 __le16 s_state; /* File system state */
1072 __le16 s_errors; /* Behaviour when detecting errors */
1073 __le16 s_minor_rev_level; /* minor revision level */
1074 /*40*/ __le32 s_lastcheck; /* time of last check */
1075 __le32 s_checkinterval; /* max. time between checks */
1076 __le32 s_creator_os; /* OS */
1077 __le32 s_rev_level; /* Revision level */
1078 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1079 __le16 s_def_resgid; /* Default gid for reserved blocks */
1080 /*
1081 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1082 *
1083 * Note: the difference between the compatible feature set and
1084 * the incompatible feature set is that if there is a bit set
1085 * in the incompatible feature set that the kernel doesn't
1086 * know about, it should refuse to mount the filesystem.
1087 *
1088 * e2fsck's requirements are more strict; if it doesn't know
1089 * about a feature in either the compatible or incompatible
1090 * feature set, it must abort and not try to meddle with
1091 * things it doesn't understand...
1092 */
1093 __le32 s_first_ino; /* First non-reserved inode */
1094 __le16 s_inode_size; /* size of inode structure */
1095 __le16 s_block_group_nr; /* block group # of this superblock */
1096 __le32 s_feature_compat; /* compatible feature set */
1097 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1098 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1099 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1100 /*78*/ char s_volume_name[16]; /* volume name */
1101 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1102 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1103 /*
1104 * Performance hints. Directory preallocation should only
1105 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1106 */
1107 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1108 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1109 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1110 /*
1111 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1112 */
1113 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1114 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1115 __le32 s_journal_dev; /* device number of journal file */
1116 __le32 s_last_orphan; /* start of list of inodes to delete */
1117 __le32 s_hash_seed[4]; /* HTREE hash seed */
1118 __u8 s_def_hash_version; /* Default hash version to use */
1119 __u8 s_jnl_backup_type;
1120 __le16 s_desc_size; /* size of group descriptor */
1121 /*100*/ __le32 s_default_mount_opts;
1122 __le32 s_first_meta_bg; /* First metablock block group */
1123 __le32 s_mkfs_time; /* When the filesystem was created */
1124 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1125 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1126 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1127 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1128 __le32 s_free_blocks_count_hi; /* Free blocks count */
1129 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1130 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1131 __le32 s_flags; /* Miscellaneous flags */
1132 __le16 s_raid_stride; /* RAID stride */
1133 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1134 __le64 s_mmp_block; /* Block for multi-mount protection */
1135 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1136 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1137 __u8 s_checksum_type; /* metadata checksum algorithm used */
1138 __le16 s_reserved_pad;
1139 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1140 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1141 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1142 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1143 snapshot's future use */
1144 __le32 s_snapshot_list; /* inode number of the head of the
1145 on-disk snapshot list */
1146 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1147 __le32 s_error_count; /* number of fs errors */
1148 __le32 s_first_error_time; /* first time an error happened */
1149 __le32 s_first_error_ino; /* inode involved in first error */
1150 __le64 s_first_error_block; /* block involved of first error */
1151 __u8 s_first_error_func[32]; /* function where the error happened */
1152 __le32 s_first_error_line; /* line number where error happened */
1153 __le32 s_last_error_time; /* most recent time of an error */
1154 __le32 s_last_error_ino; /* inode involved in last error */
1155 __le32 s_last_error_line; /* line number where error happened */
1156 __le64 s_last_error_block; /* block involved of last error */
1157 __u8 s_last_error_func[32]; /* function where the error happened */
1158 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1159 __u8 s_mount_opts[64];
1160 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1161 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1162 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1163 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1164 __le32 s_reserved[106]; /* Padding to the end of the block */
1165 __le32 s_checksum; /* crc32c(superblock) */
1166 };
1167
1168 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1169
1170 #ifdef __KERNEL__
1171
1172 /*
1173 * run-time mount flags
1174 */
1175 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1176 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1177
1178 /*
1179 * fourth extended-fs super-block data in memory
1180 */
1181 struct ext4_sb_info {
1182 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1183 unsigned long s_inodes_per_block;/* Number of inodes per block */
1184 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1185 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1186 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1187 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1188 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1189 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1190 ext4_group_t s_groups_count; /* Number of groups in the fs */
1191 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1192 unsigned long s_overhead; /* # of fs overhead clusters */
1193 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1194 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1195 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1196 struct buffer_head * s_sbh; /* Buffer containing the super block */
1197 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1198 struct buffer_head **s_group_desc;
1199 unsigned int s_mount_opt;
1200 unsigned int s_mount_opt2;
1201 unsigned int s_mount_flags;
1202 unsigned int s_def_mount_opt;
1203 ext4_fsblk_t s_sb_block;
1204 atomic64_t s_resv_clusters;
1205 kuid_t s_resuid;
1206 kgid_t s_resgid;
1207 unsigned short s_mount_state;
1208 unsigned short s_pad;
1209 int s_addr_per_block_bits;
1210 int s_desc_per_block_bits;
1211 int s_inode_size;
1212 int s_first_ino;
1213 unsigned int s_inode_readahead_blks;
1214 unsigned int s_inode_goal;
1215 spinlock_t s_next_gen_lock;
1216 u32 s_next_generation;
1217 u32 s_hash_seed[4];
1218 int s_def_hash_version;
1219 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1220 struct percpu_counter s_freeclusters_counter;
1221 struct percpu_counter s_freeinodes_counter;
1222 struct percpu_counter s_dirs_counter;
1223 struct percpu_counter s_dirtyclusters_counter;
1224 struct blockgroup_lock *s_blockgroup_lock;
1225 struct proc_dir_entry *s_proc;
1226 struct kobject s_kobj;
1227 struct completion s_kobj_unregister;
1228 struct super_block *s_sb;
1229
1230 /* Journaling */
1231 struct journal_s *s_journal;
1232 struct list_head s_orphan;
1233 struct mutex s_orphan_lock;
1234 unsigned long s_resize_flags; /* Flags indicating if there
1235 is a resizer */
1236 unsigned long s_commit_interval;
1237 u32 s_max_batch_time;
1238 u32 s_min_batch_time;
1239 struct block_device *journal_bdev;
1240 #ifdef CONFIG_QUOTA
1241 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1242 int s_jquota_fmt; /* Format of quota to use */
1243 #endif
1244 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1245 struct rb_root system_blks;
1246
1247 #ifdef EXTENTS_STATS
1248 /* ext4 extents stats */
1249 unsigned long s_ext_min;
1250 unsigned long s_ext_max;
1251 unsigned long s_depth_max;
1252 spinlock_t s_ext_stats_lock;
1253 unsigned long s_ext_blocks;
1254 unsigned long s_ext_extents;
1255 #endif
1256
1257 /* for buddy allocator */
1258 struct ext4_group_info ***s_group_info;
1259 struct inode *s_buddy_cache;
1260 spinlock_t s_md_lock;
1261 unsigned short *s_mb_offsets;
1262 unsigned int *s_mb_maxs;
1263 unsigned int s_group_info_size;
1264
1265 /* tunables */
1266 unsigned long s_stripe;
1267 unsigned int s_mb_stream_request;
1268 unsigned int s_mb_max_to_scan;
1269 unsigned int s_mb_min_to_scan;
1270 unsigned int s_mb_stats;
1271 unsigned int s_mb_order2_reqs;
1272 unsigned int s_mb_group_prealloc;
1273 unsigned int s_max_dir_size_kb;
1274 /* where last allocation was done - for stream allocation */
1275 unsigned long s_mb_last_group;
1276 unsigned long s_mb_last_start;
1277
1278 /* stats for buddy allocator */
1279 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1280 atomic_t s_bal_success; /* we found long enough chunks */
1281 atomic_t s_bal_allocated; /* in blocks */
1282 atomic_t s_bal_ex_scanned; /* total extents scanned */
1283 atomic_t s_bal_goals; /* goal hits */
1284 atomic_t s_bal_breaks; /* too long searches */
1285 atomic_t s_bal_2orders; /* 2^order hits */
1286 spinlock_t s_bal_lock;
1287 unsigned long s_mb_buddies_generated;
1288 unsigned long long s_mb_generation_time;
1289 atomic_t s_mb_lost_chunks;
1290 atomic_t s_mb_preallocated;
1291 atomic_t s_mb_discarded;
1292 atomic_t s_lock_busy;
1293
1294 /* locality groups */
1295 struct ext4_locality_group __percpu *s_locality_groups;
1296
1297 /* for write statistics */
1298 unsigned long s_sectors_written_start;
1299 u64 s_kbytes_written;
1300
1301 /* the size of zero-out chunk */
1302 unsigned int s_extent_max_zeroout_kb;
1303
1304 unsigned int s_log_groups_per_flex;
1305 struct flex_groups *s_flex_groups;
1306 ext4_group_t s_flex_groups_allocated;
1307
1308 /* workqueue for reserved extent conversions (buffered io) */
1309 struct workqueue_struct *rsv_conversion_wq;
1310
1311 /* timer for periodic error stats printing */
1312 struct timer_list s_err_report;
1313
1314 /* Lazy inode table initialization info */
1315 struct ext4_li_request *s_li_request;
1316 /* Wait multiplier for lazy initialization thread */
1317 unsigned int s_li_wait_mult;
1318
1319 /* Kernel thread for multiple mount protection */
1320 struct task_struct *s_mmp_tsk;
1321
1322 /* record the last minlen when FITRIM is called. */
1323 atomic_t s_last_trim_minblks;
1324
1325 /* Reference to checksum algorithm driver via cryptoapi */
1326 struct crypto_shash *s_chksum_driver;
1327
1328 /* Precomputed FS UUID checksum for seeding other checksums */
1329 __u32 s_csum_seed;
1330
1331 /* Reclaim extents from extent status tree */
1332 struct shrinker s_es_shrinker;
1333 struct list_head s_es_lru;
1334 unsigned long s_es_last_sorted;
1335 struct percpu_counter s_extent_cache_cnt;
1336 struct mb_cache *s_mb_cache;
1337 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
1338
1339 /* Ratelimit ext4 messages. */
1340 struct ratelimit_state s_err_ratelimit_state;
1341 struct ratelimit_state s_warning_ratelimit_state;
1342 struct ratelimit_state s_msg_ratelimit_state;
1343 };
1344
1345 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1346 {
1347 return sb->s_fs_info;
1348 }
1349 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1350 {
1351 return container_of(inode, struct ext4_inode_info, vfs_inode);
1352 }
1353
1354 static inline struct timespec ext4_current_time(struct inode *inode)
1355 {
1356 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1357 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1358 }
1359
1360 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1361 {
1362 return ino == EXT4_ROOT_INO ||
1363 ino == EXT4_USR_QUOTA_INO ||
1364 ino == EXT4_GRP_QUOTA_INO ||
1365 ino == EXT4_BOOT_LOADER_INO ||
1366 ino == EXT4_JOURNAL_INO ||
1367 ino == EXT4_RESIZE_INO ||
1368 (ino >= EXT4_FIRST_INO(sb) &&
1369 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1370 }
1371
1372 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1373 struct ext4_io_end *io_end)
1374 {
1375 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1376 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1377 atomic_inc(&EXT4_I(inode)->i_unwritten);
1378 }
1379 }
1380
1381 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1382 {
1383 return inode->i_private;
1384 }
1385
1386 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1387 {
1388 inode->i_private = io;
1389 }
1390
1391 /*
1392 * Inode dynamic state flags
1393 */
1394 enum {
1395 EXT4_STATE_JDATA, /* journaled data exists */
1396 EXT4_STATE_NEW, /* inode is newly created */
1397 EXT4_STATE_XATTR, /* has in-inode xattrs */
1398 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1399 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1400 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1401 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1402 EXT4_STATE_NEWENTRY, /* File just added to dir */
1403 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1404 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1405 nolocking */
1406 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1407 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1408 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1409 };
1410
1411 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1412 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1413 { \
1414 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1415 } \
1416 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1417 { \
1418 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1419 } \
1420 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1421 { \
1422 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1423 }
1424
1425 /* Add these declarations here only so that these functions can be
1426 * found by name. Otherwise, they are very hard to locate. */
1427 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1428 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1429 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1430 EXT4_INODE_BIT_FNS(flag, flags, 0)
1431
1432 /* Add these declarations here only so that these functions can be
1433 * found by name. Otherwise, they are very hard to locate. */
1434 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1435 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1436 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1437 #if (BITS_PER_LONG < 64)
1438 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1439
1440 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1441 {
1442 (ei)->i_state_flags = 0;
1443 }
1444 #else
1445 EXT4_INODE_BIT_FNS(state, flags, 32)
1446
1447 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1448 {
1449 /* We depend on the fact that callers will set i_flags */
1450 }
1451 #endif
1452 #else
1453 /* Assume that user mode programs are passing in an ext4fs superblock, not
1454 * a kernel struct super_block. This will allow us to call the feature-test
1455 * macros from user land. */
1456 #define EXT4_SB(sb) (sb)
1457 #endif
1458
1459 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1460
1461 /*
1462 * Codes for operating systems
1463 */
1464 #define EXT4_OS_LINUX 0
1465 #define EXT4_OS_HURD 1
1466 #define EXT4_OS_MASIX 2
1467 #define EXT4_OS_FREEBSD 3
1468 #define EXT4_OS_LITES 4
1469
1470 /*
1471 * Revision levels
1472 */
1473 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1474 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1475
1476 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1477 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1478
1479 #define EXT4_GOOD_OLD_INODE_SIZE 128
1480
1481 /*
1482 * Feature set definitions
1483 */
1484
1485 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1486 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1487 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1488 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1489 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1490 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1491 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1492 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1493 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1494 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1495 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1496 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1497 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1498 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1499 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1500 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1501 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1502 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1503
1504 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1505 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1506 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1507 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1508 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1509 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1510 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1511
1512 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1513 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1514 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1515 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1516 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1517 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1518 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1519 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1520 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1521 /*
1522 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1523 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1524 * all other data structures' checksums. However, the METADATA_CSUM and
1525 * GDT_CSUM bits are mutually exclusive.
1526 */
1527 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1528
1529 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1530 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1531 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1532 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1533 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1534 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1535 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1536 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1537 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1538 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1539 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1540 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1541 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1542 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1543
1544 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1545 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1546 EXT4_FEATURE_INCOMPAT_META_BG)
1547 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1548 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1549 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1550
1551 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1552 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1553 EXT4_FEATURE_INCOMPAT_RECOVER| \
1554 EXT4_FEATURE_INCOMPAT_META_BG)
1555 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1556 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1557 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1558
1559 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1560 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1561 EXT4_FEATURE_INCOMPAT_RECOVER| \
1562 EXT4_FEATURE_INCOMPAT_META_BG| \
1563 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1564 EXT4_FEATURE_INCOMPAT_64BIT| \
1565 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1566 EXT4_FEATURE_INCOMPAT_MMP | \
1567 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1568 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1569 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1570 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1571 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1572 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1573 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1574 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1575 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1576 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1577 EXT4_FEATURE_RO_COMPAT_QUOTA)
1578
1579 /*
1580 * Default values for user and/or group using reserved blocks
1581 */
1582 #define EXT4_DEF_RESUID 0
1583 #define EXT4_DEF_RESGID 0
1584
1585 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1586
1587 /*
1588 * Default mount options
1589 */
1590 #define EXT4_DEFM_DEBUG 0x0001
1591 #define EXT4_DEFM_BSDGROUPS 0x0002
1592 #define EXT4_DEFM_XATTR_USER 0x0004
1593 #define EXT4_DEFM_ACL 0x0008
1594 #define EXT4_DEFM_UID16 0x0010
1595 #define EXT4_DEFM_JMODE 0x0060
1596 #define EXT4_DEFM_JMODE_DATA 0x0020
1597 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1598 #define EXT4_DEFM_JMODE_WBACK 0x0060
1599 #define EXT4_DEFM_NOBARRIER 0x0100
1600 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1601 #define EXT4_DEFM_DISCARD 0x0400
1602 #define EXT4_DEFM_NODELALLOC 0x0800
1603
1604 /*
1605 * Default journal batch times
1606 */
1607 #define EXT4_DEF_MIN_BATCH_TIME 0
1608 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1609
1610 /*
1611 * Minimum number of groups in a flexgroup before we separate out
1612 * directories into the first block group of a flexgroup
1613 */
1614 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1615
1616 /*
1617 * Structure of a directory entry
1618 */
1619 #define EXT4_NAME_LEN 255
1620
1621 struct ext4_dir_entry {
1622 __le32 inode; /* Inode number */
1623 __le16 rec_len; /* Directory entry length */
1624 __le16 name_len; /* Name length */
1625 char name[EXT4_NAME_LEN]; /* File name */
1626 };
1627
1628 /*
1629 * The new version of the directory entry. Since EXT4 structures are
1630 * stored in intel byte order, and the name_len field could never be
1631 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1632 * file_type field.
1633 */
1634 struct ext4_dir_entry_2 {
1635 __le32 inode; /* Inode number */
1636 __le16 rec_len; /* Directory entry length */
1637 __u8 name_len; /* Name length */
1638 __u8 file_type;
1639 char name[EXT4_NAME_LEN]; /* File name */
1640 };
1641
1642 /*
1643 * This is a bogus directory entry at the end of each leaf block that
1644 * records checksums.
1645 */
1646 struct ext4_dir_entry_tail {
1647 __le32 det_reserved_zero1; /* Pretend to be unused */
1648 __le16 det_rec_len; /* 12 */
1649 __u8 det_reserved_zero2; /* Zero name length */
1650 __u8 det_reserved_ft; /* 0xDE, fake file type */
1651 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1652 };
1653
1654 #define EXT4_DIRENT_TAIL(block, blocksize) \
1655 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1656 ((blocksize) - \
1657 sizeof(struct ext4_dir_entry_tail))))
1658
1659 /*
1660 * Ext4 directory file types. Only the low 3 bits are used. The
1661 * other bits are reserved for now.
1662 */
1663 #define EXT4_FT_UNKNOWN 0
1664 #define EXT4_FT_REG_FILE 1
1665 #define EXT4_FT_DIR 2
1666 #define EXT4_FT_CHRDEV 3
1667 #define EXT4_FT_BLKDEV 4
1668 #define EXT4_FT_FIFO 5
1669 #define EXT4_FT_SOCK 6
1670 #define EXT4_FT_SYMLINK 7
1671
1672 #define EXT4_FT_MAX 8
1673
1674 #define EXT4_FT_DIR_CSUM 0xDE
1675
1676 /*
1677 * EXT4_DIR_PAD defines the directory entries boundaries
1678 *
1679 * NOTE: It must be a multiple of 4
1680 */
1681 #define EXT4_DIR_PAD 4
1682 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1683 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1684 ~EXT4_DIR_ROUND)
1685 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1686
1687 /*
1688 * If we ever get support for fs block sizes > page_size, we'll need
1689 * to remove the #if statements in the next two functions...
1690 */
1691 static inline unsigned int
1692 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1693 {
1694 unsigned len = le16_to_cpu(dlen);
1695
1696 #if (PAGE_CACHE_SIZE >= 65536)
1697 if (len == EXT4_MAX_REC_LEN || len == 0)
1698 return blocksize;
1699 return (len & 65532) | ((len & 3) << 16);
1700 #else
1701 return len;
1702 #endif
1703 }
1704
1705 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1706 {
1707 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1708 BUG();
1709 #if (PAGE_CACHE_SIZE >= 65536)
1710 if (len < 65536)
1711 return cpu_to_le16(len);
1712 if (len == blocksize) {
1713 if (blocksize == 65536)
1714 return cpu_to_le16(EXT4_MAX_REC_LEN);
1715 else
1716 return cpu_to_le16(0);
1717 }
1718 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1719 #else
1720 return cpu_to_le16(len);
1721 #endif
1722 }
1723
1724 /*
1725 * Hash Tree Directory indexing
1726 * (c) Daniel Phillips, 2001
1727 */
1728
1729 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1730 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1731 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1732 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1733 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1734
1735 /* Legal values for the dx_root hash_version field: */
1736
1737 #define DX_HASH_LEGACY 0
1738 #define DX_HASH_HALF_MD4 1
1739 #define DX_HASH_TEA 2
1740 #define DX_HASH_LEGACY_UNSIGNED 3
1741 #define DX_HASH_HALF_MD4_UNSIGNED 4
1742 #define DX_HASH_TEA_UNSIGNED 5
1743
1744 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1745 const void *address, unsigned int length)
1746 {
1747 struct {
1748 struct shash_desc shash;
1749 char ctx[4];
1750 } desc;
1751 int err;
1752
1753 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1754
1755 desc.shash.tfm = sbi->s_chksum_driver;
1756 desc.shash.flags = 0;
1757 *(u32 *)desc.ctx = crc;
1758
1759 err = crypto_shash_update(&desc.shash, address, length);
1760 BUG_ON(err);
1761
1762 return *(u32 *)desc.ctx;
1763 }
1764
1765 #ifdef __KERNEL__
1766
1767 /* hash info structure used by the directory hash */
1768 struct dx_hash_info
1769 {
1770 u32 hash;
1771 u32 minor_hash;
1772 int hash_version;
1773 u32 *seed;
1774 };
1775
1776
1777 /* 32 and 64 bit signed EOF for dx directories */
1778 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1779 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1780
1781
1782 /*
1783 * Control parameters used by ext4_htree_next_block
1784 */
1785 #define HASH_NB_ALWAYS 1
1786
1787
1788 /*
1789 * Describe an inode's exact location on disk and in memory
1790 */
1791 struct ext4_iloc
1792 {
1793 struct buffer_head *bh;
1794 unsigned long offset;
1795 ext4_group_t block_group;
1796 };
1797
1798 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1799 {
1800 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1801 }
1802
1803 /*
1804 * This structure is stuffed into the struct file's private_data field
1805 * for directories. It is where we put information so that we can do
1806 * readdir operations in hash tree order.
1807 */
1808 struct dir_private_info {
1809 struct rb_root root;
1810 struct rb_node *curr_node;
1811 struct fname *extra_fname;
1812 loff_t last_pos;
1813 __u32 curr_hash;
1814 __u32 curr_minor_hash;
1815 __u32 next_hash;
1816 };
1817
1818 /* calculate the first block number of the group */
1819 static inline ext4_fsblk_t
1820 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1821 {
1822 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1823 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1824 }
1825
1826 /*
1827 * Special error return code only used by dx_probe() and its callers.
1828 */
1829 #define ERR_BAD_DX_DIR -75000
1830
1831 /*
1832 * Timeout and state flag for lazy initialization inode thread.
1833 */
1834 #define EXT4_DEF_LI_WAIT_MULT 10
1835 #define EXT4_DEF_LI_MAX_START_DELAY 5
1836 #define EXT4_LAZYINIT_QUIT 0x0001
1837 #define EXT4_LAZYINIT_RUNNING 0x0002
1838
1839 /*
1840 * Lazy inode table initialization info
1841 */
1842 struct ext4_lazy_init {
1843 unsigned long li_state;
1844 struct list_head li_request_list;
1845 struct mutex li_list_mtx;
1846 };
1847
1848 struct ext4_li_request {
1849 struct super_block *lr_super;
1850 struct ext4_sb_info *lr_sbi;
1851 ext4_group_t lr_next_group;
1852 struct list_head lr_request;
1853 unsigned long lr_next_sched;
1854 unsigned long lr_timeout;
1855 };
1856
1857 struct ext4_features {
1858 struct kobject f_kobj;
1859 struct completion f_kobj_unregister;
1860 };
1861
1862 /*
1863 * This structure will be used for multiple mount protection. It will be
1864 * written into the block number saved in the s_mmp_block field in the
1865 * superblock. Programs that check MMP should assume that if
1866 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1867 * to use the filesystem, regardless of how old the timestamp is.
1868 */
1869 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1870 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1871 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1872 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1873
1874 struct mmp_struct {
1875 __le32 mmp_magic; /* Magic number for MMP */
1876 __le32 mmp_seq; /* Sequence no. updated periodically */
1877
1878 /*
1879 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1880 * purposes and do not affect the correctness of the algorithm
1881 */
1882 __le64 mmp_time; /* Time last updated */
1883 char mmp_nodename[64]; /* Node which last updated MMP block */
1884 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1885
1886 /*
1887 * mmp_check_interval is used to verify if the MMP block has been
1888 * updated on the block device. The value is updated based on the
1889 * maximum time to write the MMP block during an update cycle.
1890 */
1891 __le16 mmp_check_interval;
1892
1893 __le16 mmp_pad1;
1894 __le32 mmp_pad2[226];
1895 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1896 };
1897
1898 /* arguments passed to the mmp thread */
1899 struct mmpd_data {
1900 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1901 struct super_block *sb; /* super block of the fs */
1902 };
1903
1904 /*
1905 * Check interval multiplier
1906 * The MMP block is written every update interval and initially checked every
1907 * update interval x the multiplier (the value is then adapted based on the
1908 * write latency). The reason is that writes can be delayed under load and we
1909 * don't want readers to incorrectly assume that the filesystem is no longer
1910 * in use.
1911 */
1912 #define EXT4_MMP_CHECK_MULT 2UL
1913
1914 /*
1915 * Minimum interval for MMP checking in seconds.
1916 */
1917 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1918
1919 /*
1920 * Maximum interval for MMP checking in seconds.
1921 */
1922 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1923
1924 /*
1925 * Function prototypes
1926 */
1927
1928 /*
1929 * Ok, these declarations are also in <linux/kernel.h> but none of the
1930 * ext4 source programs needs to include it so they are duplicated here.
1931 */
1932 # define NORET_TYPE /**/
1933 # define ATTRIB_NORET __attribute__((noreturn))
1934 # define NORET_AND noreturn,
1935
1936 /* bitmap.c */
1937 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1938 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1939 struct ext4_group_desc *gdp,
1940 struct buffer_head *bh, int sz);
1941 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1942 struct ext4_group_desc *gdp,
1943 struct buffer_head *bh, int sz);
1944 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1945 struct ext4_group_desc *gdp,
1946 struct buffer_head *bh);
1947 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1948 struct ext4_group_desc *gdp,
1949 struct buffer_head *bh);
1950
1951 /* balloc.c */
1952 extern void ext4_get_group_no_and_offset(struct super_block *sb,
1953 ext4_fsblk_t blocknr,
1954 ext4_group_t *blockgrpp,
1955 ext4_grpblk_t *offsetp);
1956 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1957 ext4_fsblk_t block);
1958
1959 extern unsigned int ext4_block_group(struct super_block *sb,
1960 ext4_fsblk_t blocknr);
1961 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1962 ext4_fsblk_t blocknr);
1963 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1964 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1965 ext4_group_t group);
1966 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1967 ext4_fsblk_t goal,
1968 unsigned int flags,
1969 unsigned long *count,
1970 int *errp);
1971 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1972 s64 nclusters, unsigned int flags);
1973 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1974 extern void ext4_check_blocks_bitmap(struct super_block *);
1975 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1976 ext4_group_t block_group,
1977 struct buffer_head ** bh);
1978 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1979
1980 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1981 ext4_group_t block_group);
1982 extern int ext4_wait_block_bitmap(struct super_block *sb,
1983 ext4_group_t block_group,
1984 struct buffer_head *bh);
1985 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1986 ext4_group_t block_group);
1987 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1988 ext4_group_t block_group,
1989 struct ext4_group_desc *gdp);
1990 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1991
1992 /* dir.c */
1993 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1994 struct file *,
1995 struct ext4_dir_entry_2 *,
1996 struct buffer_head *, char *, int,
1997 unsigned int);
1998 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1999 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2000 (de), (bh), (buf), (size), (offset)))
2001 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2002 __u32 minor_hash,
2003 struct ext4_dir_entry_2 *dirent);
2004 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2005 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2006 struct buffer_head *bh,
2007 void *buf, int buf_size,
2008 const char *name, int namelen,
2009 struct ext4_dir_entry_2 **dest_de);
2010 void ext4_insert_dentry(struct inode *inode,
2011 struct ext4_dir_entry_2 *de,
2012 int buf_size,
2013 const char *name, int namelen);
2014 static inline void ext4_update_dx_flag(struct inode *inode)
2015 {
2016 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2017 EXT4_FEATURE_COMPAT_DIR_INDEX))
2018 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2019 }
2020 static unsigned char ext4_filetype_table[] = {
2021 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2022 };
2023
2024 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2025 {
2026 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2027 (filetype >= EXT4_FT_MAX))
2028 return DT_UNKNOWN;
2029
2030 return ext4_filetype_table[filetype];
2031 }
2032
2033 /* fsync.c */
2034 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2035
2036 /* hash.c */
2037 extern int ext4fs_dirhash(const char *name, int len, struct
2038 dx_hash_info *hinfo);
2039
2040 /* ialloc.c */
2041 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2042 const struct qstr *qstr, __u32 goal,
2043 uid_t *owner, int handle_type,
2044 unsigned int line_no, int nblocks);
2045
2046 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2047 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2048 0, 0, 0)
2049 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2050 type, nblocks) \
2051 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2052 (type), __LINE__, (nblocks))
2053
2054
2055 extern void ext4_free_inode(handle_t *, struct inode *);
2056 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2057 extern unsigned long ext4_count_free_inodes(struct super_block *);
2058 extern unsigned long ext4_count_dirs(struct super_block *);
2059 extern void ext4_check_inodes_bitmap(struct super_block *);
2060 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2061 extern int ext4_init_inode_table(struct super_block *sb,
2062 ext4_group_t group, int barrier);
2063 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2064
2065 /* mballoc.c */
2066 extern long ext4_mb_stats;
2067 extern long ext4_mb_max_to_scan;
2068 extern int ext4_mb_init(struct super_block *);
2069 extern int ext4_mb_release(struct super_block *);
2070 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2071 struct ext4_allocation_request *, int *);
2072 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2073 extern void ext4_discard_preallocations(struct inode *);
2074 extern int __init ext4_init_mballoc(void);
2075 extern void ext4_exit_mballoc(void);
2076 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2077 struct buffer_head *bh, ext4_fsblk_t block,
2078 unsigned long count, int flags);
2079 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2080 ext4_group_t ngroups);
2081 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2082 ext4_group_t i, struct ext4_group_desc *desc);
2083 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2084 ext4_fsblk_t block, unsigned long count);
2085 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2086
2087 /* inode.c */
2088 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2089 ext4_lblk_t, int, int *);
2090 struct buffer_head *ext4_bread(handle_t *, struct inode *,
2091 ext4_lblk_t, int, int *);
2092 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2093 struct buffer_head *bh_result, int create);
2094 int ext4_get_block(struct inode *inode, sector_t iblock,
2095 struct buffer_head *bh_result, int create);
2096 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2097 struct buffer_head *bh, int create);
2098 int ext4_walk_page_buffers(handle_t *handle,
2099 struct buffer_head *head,
2100 unsigned from,
2101 unsigned to,
2102 int *partial,
2103 int (*fn)(handle_t *handle,
2104 struct buffer_head *bh));
2105 int do_journal_get_write_access(handle_t *handle,
2106 struct buffer_head *bh);
2107 #define FALL_BACK_TO_NONDELALLOC 1
2108 #define CONVERT_INLINE_DATA 2
2109
2110 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2111 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2112 extern int ext4_setattr(struct dentry *, struct iattr *);
2113 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2114 struct kstat *stat);
2115 extern void ext4_evict_inode(struct inode *);
2116 extern void ext4_clear_inode(struct inode *);
2117 extern int ext4_sync_inode(handle_t *, struct inode *);
2118 extern void ext4_dirty_inode(struct inode *, int);
2119 extern int ext4_change_inode_journal_flag(struct inode *, int);
2120 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2121 extern int ext4_inode_attach_jinode(struct inode *inode);
2122 extern int ext4_can_truncate(struct inode *inode);
2123 extern void ext4_truncate(struct inode *);
2124 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2125 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2126 extern void ext4_set_inode_flags(struct inode *);
2127 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2128 extern int ext4_alloc_da_blocks(struct inode *inode);
2129 extern void ext4_set_aops(struct inode *inode);
2130 extern int ext4_writepage_trans_blocks(struct inode *);
2131 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2132 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2133 loff_t lstart, loff_t lend);
2134 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2135 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2136 extern void ext4_da_update_reserve_space(struct inode *inode,
2137 int used, int quota_claim);
2138
2139 /* indirect.c */
2140 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2141 struct ext4_map_blocks *map, int flags);
2142 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2143 const struct iovec *iov, loff_t offset,
2144 unsigned long nr_segs);
2145 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2146 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2147 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2148 extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
2149 ext4_lblk_t first, ext4_lblk_t stop);
2150
2151 /* ioctl.c */
2152 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2153 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2154
2155 /* migrate.c */
2156 extern int ext4_ext_migrate(struct inode *);
2157 extern int ext4_ind_migrate(struct inode *inode);
2158
2159 /* namei.c */
2160 extern int ext4_dirent_csum_verify(struct inode *inode,
2161 struct ext4_dir_entry *dirent);
2162 extern int ext4_orphan_add(handle_t *, struct inode *);
2163 extern int ext4_orphan_del(handle_t *, struct inode *);
2164 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2165 __u32 start_minor_hash, __u32 *next_hash);
2166 extern int search_dir(struct buffer_head *bh,
2167 char *search_buf,
2168 int buf_size,
2169 struct inode *dir,
2170 const struct qstr *d_name,
2171 unsigned int offset,
2172 struct ext4_dir_entry_2 **res_dir);
2173 extern int ext4_generic_delete_entry(handle_t *handle,
2174 struct inode *dir,
2175 struct ext4_dir_entry_2 *de_del,
2176 struct buffer_head *bh,
2177 void *entry_buf,
2178 int buf_size,
2179 int csum_size);
2180
2181 /* resize.c */
2182 extern int ext4_group_add(struct super_block *sb,
2183 struct ext4_new_group_data *input);
2184 extern int ext4_group_extend(struct super_block *sb,
2185 struct ext4_super_block *es,
2186 ext4_fsblk_t n_blocks_count);
2187 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2188
2189 /* super.c */
2190 extern int ext4_calculate_overhead(struct super_block *sb);
2191 extern void ext4_superblock_csum_set(struct super_block *sb);
2192 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2193 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2194 extern void ext4_kvfree(void *ptr);
2195 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2196 ext4_group_t ngroup);
2197 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2198 char nbuf[16]);
2199
2200 extern __printf(4, 5)
2201 void __ext4_error(struct super_block *, const char *, unsigned int,
2202 const char *, ...);
2203 extern __printf(5, 6)
2204 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2205 const char *, ...);
2206 extern __printf(5, 6)
2207 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2208 const char *, ...);
2209 extern void __ext4_std_error(struct super_block *, const char *,
2210 unsigned int, int);
2211 extern __printf(4, 5)
2212 void __ext4_abort(struct super_block *, const char *, unsigned int,
2213 const char *, ...);
2214 extern __printf(4, 5)
2215 void __ext4_warning(struct super_block *, const char *, unsigned int,
2216 const char *, ...);
2217 extern __printf(3, 4)
2218 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2219 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2220 const char *, unsigned int, const char *);
2221 extern __printf(7, 8)
2222 void __ext4_grp_locked_error(const char *, unsigned int,
2223 struct super_block *, ext4_group_t,
2224 unsigned long, ext4_fsblk_t,
2225 const char *, ...);
2226
2227 #ifdef CONFIG_PRINTK
2228
2229 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2230 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2231 #define ext4_error_file(file, func, line, block, fmt, ...) \
2232 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2233 #define ext4_error(sb, fmt, ...) \
2234 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2235 #define ext4_abort(sb, fmt, ...) \
2236 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2237 #define ext4_warning(sb, fmt, ...) \
2238 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2239 #define ext4_msg(sb, level, fmt, ...) \
2240 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2241 #define dump_mmp_msg(sb, mmp, msg) \
2242 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2243 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2244 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2245 fmt, ##__VA_ARGS__)
2246
2247 #else
2248
2249 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2250 do { \
2251 no_printk(fmt, ##__VA_ARGS__); \
2252 __ext4_error_inode(inode, "", 0, block, " "); \
2253 } while (0)
2254 #define ext4_error_file(file, func, line, block, fmt, ...) \
2255 do { \
2256 no_printk(fmt, ##__VA_ARGS__); \
2257 __ext4_error_file(file, "", 0, block, " "); \
2258 } while (0)
2259 #define ext4_error(sb, fmt, ...) \
2260 do { \
2261 no_printk(fmt, ##__VA_ARGS__); \
2262 __ext4_error(sb, "", 0, " "); \
2263 } while (0)
2264 #define ext4_abort(sb, fmt, ...) \
2265 do { \
2266 no_printk(fmt, ##__VA_ARGS__); \
2267 __ext4_abort(sb, "", 0, " "); \
2268 } while (0)
2269 #define ext4_warning(sb, fmt, ...) \
2270 do { \
2271 no_printk(fmt, ##__VA_ARGS__); \
2272 __ext4_warning(sb, "", 0, " "); \
2273 } while (0)
2274 #define ext4_msg(sb, level, fmt, ...) \
2275 do { \
2276 no_printk(fmt, ##__VA_ARGS__); \
2277 __ext4_msg(sb, "", " "); \
2278 } while (0)
2279 #define dump_mmp_msg(sb, mmp, msg) \
2280 __dump_mmp_msg(sb, mmp, "", 0, "")
2281 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2282 do { \
2283 no_printk(fmt, ##__VA_ARGS__); \
2284 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2285 } while (0)
2286
2287 #endif
2288
2289 extern void ext4_update_dynamic_rev(struct super_block *sb);
2290 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2291 __u32 compat);
2292 extern int ext4_update_rocompat_feature(handle_t *handle,
2293 struct super_block *sb, __u32 rocompat);
2294 extern int ext4_update_incompat_feature(handle_t *handle,
2295 struct super_block *sb, __u32 incompat);
2296 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2297 struct ext4_group_desc *bg);
2298 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2299 struct ext4_group_desc *bg);
2300 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2301 struct ext4_group_desc *bg);
2302 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2303 struct ext4_group_desc *bg);
2304 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2305 struct ext4_group_desc *bg);
2306 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2307 struct ext4_group_desc *bg);
2308 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2309 struct ext4_group_desc *bg);
2310 extern void ext4_block_bitmap_set(struct super_block *sb,
2311 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2312 extern void ext4_inode_bitmap_set(struct super_block *sb,
2313 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2314 extern void ext4_inode_table_set(struct super_block *sb,
2315 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2316 extern void ext4_free_group_clusters_set(struct super_block *sb,
2317 struct ext4_group_desc *bg,
2318 __u32 count);
2319 extern void ext4_free_inodes_set(struct super_block *sb,
2320 struct ext4_group_desc *bg, __u32 count);
2321 extern void ext4_used_dirs_set(struct super_block *sb,
2322 struct ext4_group_desc *bg, __u32 count);
2323 extern void ext4_itable_unused_set(struct super_block *sb,
2324 struct ext4_group_desc *bg, __u32 count);
2325 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2326 struct ext4_group_desc *gdp);
2327 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2328 struct ext4_group_desc *gdp);
2329 extern int ext4_register_li_request(struct super_block *sb,
2330 ext4_group_t first_not_zeroed);
2331
2332 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2333 {
2334 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2335 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2336 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2337 }
2338
2339 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2340 {
2341 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2342 le32_to_cpu(es->s_blocks_count_lo);
2343 }
2344
2345 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2346 {
2347 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2348 le32_to_cpu(es->s_r_blocks_count_lo);
2349 }
2350
2351 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2352 {
2353 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2354 le32_to_cpu(es->s_free_blocks_count_lo);
2355 }
2356
2357 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2358 ext4_fsblk_t blk)
2359 {
2360 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2361 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2362 }
2363
2364 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2365 ext4_fsblk_t blk)
2366 {
2367 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2368 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2369 }
2370
2371 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2372 ext4_fsblk_t blk)
2373 {
2374 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2375 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2376 }
2377
2378 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2379 {
2380 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2381 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2382 le32_to_cpu(raw_inode->i_size_lo);
2383 else
2384 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2385 }
2386
2387 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2388 {
2389 raw_inode->i_size_lo = cpu_to_le32(i_size);
2390 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2391 }
2392
2393 static inline
2394 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2395 ext4_group_t group)
2396 {
2397 struct ext4_group_info ***grp_info;
2398 long indexv, indexh;
2399 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2400 grp_info = EXT4_SB(sb)->s_group_info;
2401 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2402 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2403 return grp_info[indexv][indexh];
2404 }
2405
2406 /*
2407 * Reading s_groups_count requires using smp_rmb() afterwards. See
2408 * the locking protocol documented in the comments of ext4_group_add()
2409 * in resize.c
2410 */
2411 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2412 {
2413 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2414
2415 smp_rmb();
2416 return ngroups;
2417 }
2418
2419 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2420 ext4_group_t block_group)
2421 {
2422 return block_group >> sbi->s_log_groups_per_flex;
2423 }
2424
2425 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2426 {
2427 return 1 << sbi->s_log_groups_per_flex;
2428 }
2429
2430 #define ext4_std_error(sb, errno) \
2431 do { \
2432 if ((errno)) \
2433 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2434 } while (0)
2435
2436 #ifdef CONFIG_SMP
2437 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2438 * counters. So we need to make sure we have free clusters more
2439 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2440 */
2441 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2442 #else
2443 #define EXT4_FREECLUSTERS_WATERMARK 0
2444 #endif
2445
2446 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2447 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2448 {
2449 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2450 !mutex_is_locked(&inode->i_mutex));
2451 down_write(&EXT4_I(inode)->i_data_sem);
2452 if (newsize > EXT4_I(inode)->i_disksize)
2453 EXT4_I(inode)->i_disksize = newsize;
2454 up_write(&EXT4_I(inode)->i_data_sem);
2455 }
2456
2457 struct ext4_group_info {
2458 unsigned long bb_state;
2459 struct rb_root bb_free_root;
2460 ext4_grpblk_t bb_first_free; /* first free block */
2461 ext4_grpblk_t bb_free; /* total free blocks */
2462 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2463 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2464 struct list_head bb_prealloc_list;
2465 #ifdef DOUBLE_CHECK
2466 void *bb_bitmap;
2467 #endif
2468 struct rw_semaphore alloc_sem;
2469 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2470 * regions, index is order.
2471 * bb_counters[3] = 5 means
2472 * 5 free 8-block regions. */
2473 };
2474
2475 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2476 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2477 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2478 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2479
2480 #define EXT4_MB_GRP_NEED_INIT(grp) \
2481 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2482 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2483 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2484 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2485 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2486
2487 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2488 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2489 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2490 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2491 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2492 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2493
2494 #define EXT4_MAX_CONTENTION 8
2495 #define EXT4_CONTENTION_THRESHOLD 2
2496
2497 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2498 ext4_group_t group)
2499 {
2500 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2501 }
2502
2503 /*
2504 * Returns true if the filesystem is busy enough that attempts to
2505 * access the block group locks has run into contention.
2506 */
2507 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2508 {
2509 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2510 }
2511
2512 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2513 {
2514 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2515 if (spin_trylock(lock))
2516 /*
2517 * We're able to grab the lock right away, so drop the
2518 * lock contention counter.
2519 */
2520 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2521 else {
2522 /*
2523 * The lock is busy, so bump the contention counter,
2524 * and then wait on the spin lock.
2525 */
2526 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2527 EXT4_MAX_CONTENTION);
2528 spin_lock(lock);
2529 }
2530 }
2531
2532 static inline void ext4_unlock_group(struct super_block *sb,
2533 ext4_group_t group)
2534 {
2535 spin_unlock(ext4_group_lock_ptr(sb, group));
2536 }
2537
2538 /*
2539 * Block validity checking
2540 */
2541 #define ext4_check_indirect_blockref(inode, bh) \
2542 ext4_check_blockref(__func__, __LINE__, inode, \
2543 (__le32 *)(bh)->b_data, \
2544 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2545
2546 #define ext4_ind_check_inode(inode) \
2547 ext4_check_blockref(__func__, __LINE__, inode, \
2548 EXT4_I(inode)->i_data, \
2549 EXT4_NDIR_BLOCKS)
2550
2551 /*
2552 * Inodes and files operations
2553 */
2554
2555 /* dir.c */
2556 extern const struct file_operations ext4_dir_operations;
2557
2558 /* file.c */
2559 extern const struct inode_operations ext4_file_inode_operations;
2560 extern const struct file_operations ext4_file_operations;
2561 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2562
2563 /* inline.c */
2564 extern int ext4_has_inline_data(struct inode *inode);
2565 extern int ext4_get_max_inline_size(struct inode *inode);
2566 extern int ext4_find_inline_data_nolock(struct inode *inode);
2567 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2568 unsigned int len);
2569 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2570
2571 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2572 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2573 struct inode *inode,
2574 loff_t pos, unsigned len,
2575 unsigned flags,
2576 struct page **pagep);
2577 extern int ext4_write_inline_data_end(struct inode *inode,
2578 loff_t pos, unsigned len,
2579 unsigned copied,
2580 struct page *page);
2581 extern struct buffer_head *
2582 ext4_journalled_write_inline_data(struct inode *inode,
2583 unsigned len,
2584 struct page *page);
2585 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2586 struct inode *inode,
2587 loff_t pos, unsigned len,
2588 unsigned flags,
2589 struct page **pagep,
2590 void **fsdata);
2591 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2592 unsigned len, unsigned copied,
2593 struct page *page);
2594 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2595 struct inode *inode);
2596 extern int ext4_try_create_inline_dir(handle_t *handle,
2597 struct inode *parent,
2598 struct inode *inode);
2599 extern int ext4_read_inline_dir(struct file *filp,
2600 struct dir_context *ctx,
2601 int *has_inline_data);
2602 extern int htree_inlinedir_to_tree(struct file *dir_file,
2603 struct inode *dir, ext4_lblk_t block,
2604 struct dx_hash_info *hinfo,
2605 __u32 start_hash, __u32 start_minor_hash,
2606 int *has_inline_data);
2607 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2608 const struct qstr *d_name,
2609 struct ext4_dir_entry_2 **res_dir,
2610 int *has_inline_data);
2611 extern int ext4_delete_inline_entry(handle_t *handle,
2612 struct inode *dir,
2613 struct ext4_dir_entry_2 *de_del,
2614 struct buffer_head *bh,
2615 int *has_inline_data);
2616 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2617 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2618 struct ext4_dir_entry_2 **parent_de,
2619 int *retval);
2620 extern int ext4_inline_data_fiemap(struct inode *inode,
2621 struct fiemap_extent_info *fieinfo,
2622 int *has_inline);
2623 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2624 struct inode *inode,
2625 int needed);
2626 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2627
2628 extern int ext4_convert_inline_data(struct inode *inode);
2629
2630 /* namei.c */
2631 extern const struct inode_operations ext4_dir_inode_operations;
2632 extern const struct inode_operations ext4_special_inode_operations;
2633 extern struct dentry *ext4_get_parent(struct dentry *child);
2634 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2635 struct ext4_dir_entry_2 *de,
2636 int blocksize, int csum_size,
2637 unsigned int parent_ino, int dotdot_real_len);
2638 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2639 unsigned int blocksize);
2640 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2641 struct inode *inode,
2642 struct buffer_head *bh);
2643 #define S_SHIFT 12
2644 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2645 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2646 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2647 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2648 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2649 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2650 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2651 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2652 };
2653
2654 static inline void ext4_set_de_type(struct super_block *sb,
2655 struct ext4_dir_entry_2 *de,
2656 umode_t mode) {
2657 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2658 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2659 }
2660
2661
2662 /* symlink.c */
2663 extern const struct inode_operations ext4_symlink_inode_operations;
2664 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2665
2666 /* block_validity */
2667 extern void ext4_release_system_zone(struct super_block *sb);
2668 extern int ext4_setup_system_zone(struct super_block *sb);
2669 extern int __init ext4_init_system_zone(void);
2670 extern void ext4_exit_system_zone(void);
2671 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2672 ext4_fsblk_t start_blk,
2673 unsigned int count);
2674 extern int ext4_check_blockref(const char *, unsigned int,
2675 struct inode *, __le32 *, unsigned int);
2676
2677 /* extents.c */
2678 struct ext4_ext_path;
2679 struct ext4_extent;
2680
2681 /*
2682 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2683 * __le32.
2684 */
2685 #define EXT_MAX_BLOCKS 0xffffffff
2686
2687 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2688 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2689 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2690 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2691 struct ext4_map_blocks *map, int flags);
2692 extern void ext4_ext_truncate(handle_t *, struct inode *);
2693 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2694 ext4_lblk_t end);
2695 extern void ext4_ext_init(struct super_block *);
2696 extern void ext4_ext_release(struct super_block *);
2697 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2698 loff_t len);
2699 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2700 loff_t offset, ssize_t len);
2701 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2702 struct ext4_map_blocks *map, int flags);
2703 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2704 ext4_lblk_t lblocks);
2705 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2706 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2707 int num,
2708 struct ext4_ext_path *path);
2709 extern int ext4_can_extents_be_merged(struct inode *inode,
2710 struct ext4_extent *ex1,
2711 struct ext4_extent *ex2);
2712 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2713 struct ext4_ext_path *,
2714 struct ext4_extent *, int);
2715 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2716 struct ext4_ext_path *,
2717 int flags);
2718 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2719 extern int ext4_ext_check_inode(struct inode *inode);
2720 extern int ext4_find_delalloc_range(struct inode *inode,
2721 ext4_lblk_t lblk_start,
2722 ext4_lblk_t lblk_end);
2723 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2724 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2725 __u64 start, __u64 len);
2726 extern int ext4_ext_precache(struct inode *inode);
2727 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2728
2729 /* move_extent.c */
2730 extern void ext4_double_down_write_data_sem(struct inode *first,
2731 struct inode *second);
2732 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2733 struct inode *donor_inode);
2734 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2735 __u64 start_orig, __u64 start_donor,
2736 __u64 len, __u64 *moved_len);
2737 extern int mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
2738 struct ext4_extent **extent);
2739
2740 /* page-io.c */
2741 extern int __init ext4_init_pageio(void);
2742 extern void ext4_exit_pageio(void);
2743 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2744 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2745 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2746 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2747 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2748 struct writeback_control *wbc);
2749 extern void ext4_end_io_rsv_work(struct work_struct *work);
2750 extern void ext4_io_submit(struct ext4_io_submit *io);
2751 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2752 struct page *page,
2753 int len,
2754 struct writeback_control *wbc,
2755 bool keep_towrite);
2756
2757 /* mmp.c */
2758 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2759
2760 /*
2761 * Note that these flags will never ever appear in a buffer_head's state flag.
2762 * See EXT4_MAP_... to see where this is used.
2763 */
2764 enum ext4_state_bits {
2765 BH_AllocFromCluster /* allocated blocks were part of already
2766 * allocated cluster. */
2767 = BH_JBDPrivateStart
2768 };
2769
2770 /*
2771 * Add new method to test whether block and inode bitmaps are properly
2772 * initialized. With uninit_bg reading the block from disk is not enough
2773 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2774 */
2775 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2776
2777 static inline int bitmap_uptodate(struct buffer_head *bh)
2778 {
2779 return (buffer_uptodate(bh) &&
2780 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2781 }
2782 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2783 {
2784 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2785 }
2786
2787 /*
2788 * Disable DIO read nolock optimization, so new dioreaders will be forced
2789 * to grab i_mutex
2790 */
2791 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2792 {
2793 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2794 smp_mb();
2795 }
2796 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2797 {
2798 smp_mb();
2799 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2800 }
2801
2802 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2803
2804 /* For ioend & aio unwritten conversion wait queues */
2805 #define EXT4_WQ_HASH_SZ 37
2806 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2807 EXT4_WQ_HASH_SZ])
2808 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2809 EXT4_WQ_HASH_SZ])
2810 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2811 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2812
2813 #define EXT4_RESIZING 0
2814 extern int ext4_resize_begin(struct super_block *sb);
2815 extern void ext4_resize_end(struct super_block *sb);
2816
2817 #endif /* __KERNEL__ */
2818
2819 #endif /* _EXT4_H */
Linux kernel - Deliverables
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