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ext4: ext4_inline_data_fiemap should respect callers argument
[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 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
162 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
163
164 struct ext4_map_blocks {
165 ext4_fsblk_t m_pblk;
166 ext4_lblk_t m_lblk;
167 unsigned int m_len;
168 unsigned int m_flags;
169 };
170
171 /*
172 * Flags for ext4_io_end->flags
173 */
174 #define EXT4_IO_END_UNWRITTEN 0x0001
175
176 /*
177 * For converting unwritten extents on a work queue. 'handle' is used for
178 * buffered writeback.
179 */
180 typedef struct ext4_io_end {
181 struct list_head list; /* per-file finished IO list */
182 handle_t *handle; /* handle reserved for extent
183 * conversion */
184 struct inode *inode; /* file being written to */
185 struct bio *bio; /* Linked list of completed
186 * bios covering the extent */
187 unsigned int flag; /* unwritten or not */
188 loff_t offset; /* offset in the file */
189 ssize_t size; /* size of the extent */
190 atomic_t count; /* reference counter */
191 } ext4_io_end_t;
192
193 struct ext4_io_submit {
194 int io_op;
195 struct bio *io_bio;
196 ext4_io_end_t *io_end;
197 sector_t io_next_block;
198 };
199
200 /*
201 * Special inodes numbers
202 */
203 #define EXT4_BAD_INO 1 /* Bad blocks inode */
204 #define EXT4_ROOT_INO 2 /* Root inode */
205 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
206 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
207 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
208 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
209 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
210 #define EXT4_JOURNAL_INO 8 /* Journal inode */
211
212 /* First non-reserved inode for old ext4 filesystems */
213 #define EXT4_GOOD_OLD_FIRST_INO 11
214
215 /*
216 * Maximal count of links to a file
217 */
218 #define EXT4_LINK_MAX 65000
219
220 /*
221 * Macro-instructions used to manage several block sizes
222 */
223 #define EXT4_MIN_BLOCK_SIZE 1024
224 #define EXT4_MAX_BLOCK_SIZE 65536
225 #define EXT4_MIN_BLOCK_LOG_SIZE 10
226 #define EXT4_MAX_BLOCK_LOG_SIZE 16
227 #ifdef __KERNEL__
228 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
229 #else
230 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
231 #endif
232 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
233 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
234 EXT4_SB(s)->s_cluster_bits)
235 #ifdef __KERNEL__
236 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
237 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
238 #else
239 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
240 #endif
241 #ifdef __KERNEL__
242 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
243 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
244 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
245 #else
246 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
247 EXT4_GOOD_OLD_INODE_SIZE : \
248 (s)->s_inode_size)
249 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
250 EXT4_GOOD_OLD_FIRST_INO : \
251 (s)->s_first_ino)
252 #endif
253 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
254
255 /* Translate a block number to a cluster number */
256 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
257 /* Translate a cluster number to a block number */
258 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
259 /* Translate # of blks to # of clusters */
260 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
261 (sbi)->s_cluster_bits)
262 /* Mask out the low bits to get the starting block of the cluster */
263 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
264 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
265 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
266 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
267 /* Get the cluster offset */
268 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
269 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
270 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
271 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
272
273 /*
274 * Structure of a blocks group descriptor
275 */
276 struct ext4_group_desc
277 {
278 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
279 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
280 __le32 bg_inode_table_lo; /* Inodes table block */
281 __le16 bg_free_blocks_count_lo;/* Free blocks count */
282 __le16 bg_free_inodes_count_lo;/* Free inodes count */
283 __le16 bg_used_dirs_count_lo; /* Directories count */
284 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
285 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
286 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
287 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
288 __le16 bg_itable_unused_lo; /* Unused inodes count */
289 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
290 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
291 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
292 __le32 bg_inode_table_hi; /* Inodes table block MSB */
293 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
294 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
295 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
296 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
297 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
298 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
299 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
300 __u32 bg_reserved;
301 };
302
303 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
304 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
305 sizeof(__le16))
306 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
307 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
308 sizeof(__le16))
309
310 /*
311 * Structure of a flex block group info
312 */
313
314 struct flex_groups {
315 atomic64_t free_clusters;
316 atomic_t free_inodes;
317 atomic_t used_dirs;
318 };
319
320 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
321 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
322 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
323
324 /*
325 * Macro-instructions used to manage group descriptors
326 */
327 #define EXT4_MIN_DESC_SIZE 32
328 #define EXT4_MIN_DESC_SIZE_64BIT 64
329 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
330 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
331 #ifdef __KERNEL__
332 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
333 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
335 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
336 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
337 #else
338 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
339 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
340 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
341 #endif
342
343 /*
344 * Constants relative to the data blocks
345 */
346 #define EXT4_NDIR_BLOCKS 12
347 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
348 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
349 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
350 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
351
352 /*
353 * Inode flags
354 */
355 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
356 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
357 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
358 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
359 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
360 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
361 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
362 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
363 /* Reserved for compression usage... */
364 #define EXT4_DIRTY_FL 0x00000100
365 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
366 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
367 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
368 /* End compression flags --- maybe not all used */
369 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
370 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
371 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
372 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
373 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
374 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
375 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
376 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
377 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
378 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
379 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
380 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
381
382 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
383 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
384
385 /* Flags that should be inherited by new inodes from their parent. */
386 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
387 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
388 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
389 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
390
391 /* Flags that are appropriate for regular files (all but dir-specific ones). */
392 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
393
394 /* Flags that are appropriate for non-directories/regular files. */
395 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
396
397 /* Mask out flags that are inappropriate for the given type of inode. */
398 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
399 {
400 if (S_ISDIR(mode))
401 return flags;
402 else if (S_ISREG(mode))
403 return flags & EXT4_REG_FLMASK;
404 else
405 return flags & EXT4_OTHER_FLMASK;
406 }
407
408 /*
409 * Inode flags used for atomic set/get
410 */
411 enum {
412 EXT4_INODE_SECRM = 0, /* Secure deletion */
413 EXT4_INODE_UNRM = 1, /* Undelete */
414 EXT4_INODE_COMPR = 2, /* Compress file */
415 EXT4_INODE_SYNC = 3, /* Synchronous updates */
416 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
417 EXT4_INODE_APPEND = 5, /* writes to file may only append */
418 EXT4_INODE_NODUMP = 6, /* do not dump file */
419 EXT4_INODE_NOATIME = 7, /* do not update atime */
420 /* Reserved for compression usage... */
421 EXT4_INODE_DIRTY = 8,
422 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
423 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
424 EXT4_INODE_ECOMPR = 11, /* Compression error */
425 /* End compression flags --- maybe not all used */
426 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
427 EXT4_INODE_IMAGIC = 13, /* AFS directory */
428 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
429 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
430 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
431 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
432 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
433 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
434 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
435 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
436 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
437 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
438 };
439
440 /*
441 * Since it's pretty easy to mix up bit numbers and hex values, we use a
442 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
443 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
444 * any extra space in the compiled kernel image, otherwise, the build will fail.
445 * It's important that these values are the same, since we are using
446 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
447 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
448 * values found in ext2, ext3 and ext4 filesystems, and of course the values
449 * defined in e2fsprogs.
450 *
451 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
452 */
453 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
454 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
455
456 static inline void ext4_check_flag_values(void)
457 {
458 CHECK_FLAG_VALUE(SECRM);
459 CHECK_FLAG_VALUE(UNRM);
460 CHECK_FLAG_VALUE(COMPR);
461 CHECK_FLAG_VALUE(SYNC);
462 CHECK_FLAG_VALUE(IMMUTABLE);
463 CHECK_FLAG_VALUE(APPEND);
464 CHECK_FLAG_VALUE(NODUMP);
465 CHECK_FLAG_VALUE(NOATIME);
466 CHECK_FLAG_VALUE(DIRTY);
467 CHECK_FLAG_VALUE(COMPRBLK);
468 CHECK_FLAG_VALUE(NOCOMPR);
469 CHECK_FLAG_VALUE(ECOMPR);
470 CHECK_FLAG_VALUE(INDEX);
471 CHECK_FLAG_VALUE(IMAGIC);
472 CHECK_FLAG_VALUE(JOURNAL_DATA);
473 CHECK_FLAG_VALUE(NOTAIL);
474 CHECK_FLAG_VALUE(DIRSYNC);
475 CHECK_FLAG_VALUE(TOPDIR);
476 CHECK_FLAG_VALUE(HUGE_FILE);
477 CHECK_FLAG_VALUE(EXTENTS);
478 CHECK_FLAG_VALUE(EA_INODE);
479 CHECK_FLAG_VALUE(EOFBLOCKS);
480 CHECK_FLAG_VALUE(INLINE_DATA);
481 CHECK_FLAG_VALUE(RESERVED);
482 }
483
484 /* Used to pass group descriptor data when online resize is done */
485 struct ext4_new_group_input {
486 __u32 group; /* Group number for this data */
487 __u64 block_bitmap; /* Absolute block number of block bitmap */
488 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
489 __u64 inode_table; /* Absolute block number of inode table start */
490 __u32 blocks_count; /* Total number of blocks in this group */
491 __u16 reserved_blocks; /* Number of reserved blocks in this group */
492 __u16 unused;
493 };
494
495 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
496 struct compat_ext4_new_group_input {
497 u32 group;
498 compat_u64 block_bitmap;
499 compat_u64 inode_bitmap;
500 compat_u64 inode_table;
501 u32 blocks_count;
502 u16 reserved_blocks;
503 u16 unused;
504 };
505 #endif
506
507 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
508 struct ext4_new_group_data {
509 __u32 group;
510 __u64 block_bitmap;
511 __u64 inode_bitmap;
512 __u64 inode_table;
513 __u32 blocks_count;
514 __u16 reserved_blocks;
515 __u16 unused;
516 __u32 free_blocks_count;
517 };
518
519 /* Indexes used to index group tables in ext4_new_group_data */
520 enum {
521 BLOCK_BITMAP = 0, /* block bitmap */
522 INODE_BITMAP, /* inode bitmap */
523 INODE_TABLE, /* inode tables */
524 GROUP_TABLE_COUNT,
525 };
526
527 /*
528 * Flags used by ext4_map_blocks()
529 */
530 /* Allocate any needed blocks and/or convert an unwritten
531 extent to be an initialized ext4 */
532 #define EXT4_GET_BLOCKS_CREATE 0x0001
533 /* Request the creation of an unwritten extent */
534 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
535 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
536 EXT4_GET_BLOCKS_CREATE)
537 /* Caller is from the delayed allocation writeout path
538 * finally doing the actual allocation of delayed blocks */
539 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
540 /* caller is from the direct IO path, request to creation of an
541 unwritten extents if not allocated, split the unwritten
542 extent if blocks has been preallocated already*/
543 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
544 #define EXT4_GET_BLOCKS_CONVERT 0x0010
545 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
547 /* Convert extent to initialized after IO complete */
548 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
549 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
550 /* Eventual metadata allocation (due to growing extent tree)
551 * should not fail, so try to use reserved blocks for that.*/
552 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
553 /* Don't normalize allocation size (used for fallocate) */
554 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
555 /* Request will not result in inode size update (user for fallocate) */
556 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
557 /* Do not take i_data_sem locking in ext4_map_blocks */
558 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
559 /* Convert written extents to unwritten */
560 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
561
562 /*
563 * The bit position of these flags must not overlap with any of the
564 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
565 * read_extent_tree_block(), ext4_split_extent_at(),
566 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
567 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
568 * caching the extents when reading from the extent tree while a
569 * truncate or punch hole operation is in progress.
570 */
571 #define EXT4_EX_NOCACHE 0x40000000
572 #define EXT4_EX_FORCE_CACHE 0x20000000
573
574 /*
575 * Flags used by ext4_free_blocks
576 */
577 #define EXT4_FREE_BLOCKS_METADATA 0x0001
578 #define EXT4_FREE_BLOCKS_FORGET 0x0002
579 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
583
584 /*
585 * ioctl commands
586 */
587 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
588 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
589 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
590 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
591 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
592 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
593 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
594 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
595 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
596 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
597 #define EXT4_IOC_MIGRATE _IO('f', 9)
598 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
599 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
600 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
601 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
602 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
603 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
604 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
605
606 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
607 /*
608 * ioctl commands in 32 bit emulation
609 */
610 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
611 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
612 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
613 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
614 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
615 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
616 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
617 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
618 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
619 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
620 #endif
621
622 /* Max physical block we can address w/o extents */
623 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
624
625 /*
626 * Structure of an inode on the disk
627 */
628 struct ext4_inode {
629 __le16 i_mode; /* File mode */
630 __le16 i_uid; /* Low 16 bits of Owner Uid */
631 __le32 i_size_lo; /* Size in bytes */
632 __le32 i_atime; /* Access time */
633 __le32 i_ctime; /* Inode Change time */
634 __le32 i_mtime; /* Modification time */
635 __le32 i_dtime; /* Deletion Time */
636 __le16 i_gid; /* Low 16 bits of Group Id */
637 __le16 i_links_count; /* Links count */
638 __le32 i_blocks_lo; /* Blocks count */
639 __le32 i_flags; /* File flags */
640 union {
641 struct {
642 __le32 l_i_version;
643 } linux1;
644 struct {
645 __u32 h_i_translator;
646 } hurd1;
647 struct {
648 __u32 m_i_reserved1;
649 } masix1;
650 } osd1; /* OS dependent 1 */
651 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
652 __le32 i_generation; /* File version (for NFS) */
653 __le32 i_file_acl_lo; /* File ACL */
654 __le32 i_size_high;
655 __le32 i_obso_faddr; /* Obsoleted fragment address */
656 union {
657 struct {
658 __le16 l_i_blocks_high; /* were l_i_reserved1 */
659 __le16 l_i_file_acl_high;
660 __le16 l_i_uid_high; /* these 2 fields */
661 __le16 l_i_gid_high; /* were reserved2[0] */
662 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
663 __le16 l_i_reserved;
664 } linux2;
665 struct {
666 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
667 __u16 h_i_mode_high;
668 __u16 h_i_uid_high;
669 __u16 h_i_gid_high;
670 __u32 h_i_author;
671 } hurd2;
672 struct {
673 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
674 __le16 m_i_file_acl_high;
675 __u32 m_i_reserved2[2];
676 } masix2;
677 } osd2; /* OS dependent 2 */
678 __le16 i_extra_isize;
679 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
680 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
681 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
682 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
683 __le32 i_crtime; /* File Creation time */
684 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
685 __le32 i_version_hi; /* high 32 bits for 64-bit version */
686 };
687
688 struct move_extent {
689 __u32 reserved; /* should be zero */
690 __u32 donor_fd; /* donor file descriptor */
691 __u64 orig_start; /* logical start offset in block for orig */
692 __u64 donor_start; /* logical start offset in block for donor */
693 __u64 len; /* block length to be moved */
694 __u64 moved_len; /* moved block length */
695 };
696
697 #define EXT4_EPOCH_BITS 2
698 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
699 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
700
701 /*
702 * Extended fields will fit into an inode if the filesystem was formatted
703 * with large inodes (-I 256 or larger) and there are not currently any EAs
704 * consuming all of the available space. For new inodes we always reserve
705 * enough space for the kernel's known extended fields, but for inodes
706 * created with an old kernel this might not have been the case. None of
707 * the extended inode fields is critical for correct filesystem operation.
708 * This macro checks if a certain field fits in the inode. Note that
709 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
710 */
711 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
712 ((offsetof(typeof(*ext4_inode), field) + \
713 sizeof((ext4_inode)->field)) \
714 <= (EXT4_GOOD_OLD_INODE_SIZE + \
715 (einode)->i_extra_isize)) \
716
717 static inline __le32 ext4_encode_extra_time(struct timespec *time)
718 {
719 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
720 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
721 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
722 }
723
724 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
725 {
726 if (sizeof(time->tv_sec) > 4)
727 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
728 << 32;
729 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
730 }
731
732 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
733 do { \
734 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
735 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
736 (raw_inode)->xtime ## _extra = \
737 ext4_encode_extra_time(&(inode)->xtime); \
738 } while (0)
739
740 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
741 do { \
742 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
743 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
744 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
745 (raw_inode)->xtime ## _extra = \
746 ext4_encode_extra_time(&(einode)->xtime); \
747 } while (0)
748
749 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
750 do { \
751 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
752 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
753 ext4_decode_extra_time(&(inode)->xtime, \
754 raw_inode->xtime ## _extra); \
755 else \
756 (inode)->xtime.tv_nsec = 0; \
757 } while (0)
758
759 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
760 do { \
761 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
762 (einode)->xtime.tv_sec = \
763 (signed)le32_to_cpu((raw_inode)->xtime); \
764 else \
765 (einode)->xtime.tv_sec = 0; \
766 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
767 ext4_decode_extra_time(&(einode)->xtime, \
768 raw_inode->xtime ## _extra); \
769 else \
770 (einode)->xtime.tv_nsec = 0; \
771 } while (0)
772
773 #define i_disk_version osd1.linux1.l_i_version
774
775 #if defined(__KERNEL__) || defined(__linux__)
776 #define i_reserved1 osd1.linux1.l_i_reserved1
777 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
778 #define i_blocks_high osd2.linux2.l_i_blocks_high
779 #define i_uid_low i_uid
780 #define i_gid_low i_gid
781 #define i_uid_high osd2.linux2.l_i_uid_high
782 #define i_gid_high osd2.linux2.l_i_gid_high
783 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
784
785 #elif defined(__GNU__)
786
787 #define i_translator osd1.hurd1.h_i_translator
788 #define i_uid_high osd2.hurd2.h_i_uid_high
789 #define i_gid_high osd2.hurd2.h_i_gid_high
790 #define i_author osd2.hurd2.h_i_author
791
792 #elif defined(__masix__)
793
794 #define i_reserved1 osd1.masix1.m_i_reserved1
795 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
796 #define i_reserved2 osd2.masix2.m_i_reserved2
797
798 #endif /* defined(__KERNEL__) || defined(__linux__) */
799
800 #include "extents_status.h"
801
802 /*
803 * fourth extended file system inode data in memory
804 */
805 struct ext4_inode_info {
806 __le32 i_data[15]; /* unconverted */
807 __u32 i_dtime;
808 ext4_fsblk_t i_file_acl;
809
810 /*
811 * i_block_group is the number of the block group which contains
812 * this file's inode. Constant across the lifetime of the inode,
813 * it is ued for making block allocation decisions - we try to
814 * place a file's data blocks near its inode block, and new inodes
815 * near to their parent directory's inode.
816 */
817 ext4_group_t i_block_group;
818 ext4_lblk_t i_dir_start_lookup;
819 #if (BITS_PER_LONG < 64)
820 unsigned long i_state_flags; /* Dynamic state flags */
821 #endif
822 unsigned long i_flags;
823
824 /*
825 * Extended attributes can be read independently of the main file
826 * data. Taking i_mutex even when reading would cause contention
827 * between readers of EAs and writers of regular file data, so
828 * instead we synchronize on xattr_sem when reading or changing
829 * EAs.
830 */
831 struct rw_semaphore xattr_sem;
832
833 struct list_head i_orphan; /* unlinked but open inodes */
834
835 /*
836 * i_disksize keeps track of what the inode size is ON DISK, not
837 * in memory. During truncate, i_size is set to the new size by
838 * the VFS prior to calling ext4_truncate(), but the filesystem won't
839 * set i_disksize to 0 until the truncate is actually under way.
840 *
841 * The intent is that i_disksize always represents the blocks which
842 * are used by this file. This allows recovery to restart truncate
843 * on orphans if we crash during truncate. We actually write i_disksize
844 * into the on-disk inode when writing inodes out, instead of i_size.
845 *
846 * The only time when i_disksize and i_size may be different is when
847 * a truncate is in progress. The only things which change i_disksize
848 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
849 */
850 loff_t i_disksize;
851
852 /*
853 * i_data_sem is for serialising ext4_truncate() against
854 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
855 * data tree are chopped off during truncate. We can't do that in
856 * ext4 because whenever we perform intermediate commits during
857 * truncate, the inode and all the metadata blocks *must* be in a
858 * consistent state which allows truncation of the orphans to restart
859 * during recovery. Hence we must fix the get_block-vs-truncate race
860 * by other means, so we have i_data_sem.
861 */
862 struct rw_semaphore i_data_sem;
863 struct inode vfs_inode;
864 struct jbd2_inode *jinode;
865
866 spinlock_t i_raw_lock; /* protects updates to the raw inode */
867
868 /*
869 * File creation time. Its function is same as that of
870 * struct timespec i_{a,c,m}time in the generic inode.
871 */
872 struct timespec i_crtime;
873
874 /* mballoc */
875 struct list_head i_prealloc_list;
876 spinlock_t i_prealloc_lock;
877
878 /* extents status tree */
879 struct ext4_es_tree i_es_tree;
880 rwlock_t i_es_lock;
881 struct list_head i_es_list;
882 unsigned int i_es_all_nr; /* protected by i_es_lock */
883 unsigned int i_es_shk_nr; /* protected by i_es_lock */
884 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
885 extents to shrink. Protected by
886 i_es_lock */
887
888 /* ialloc */
889 ext4_group_t i_last_alloc_group;
890
891 /* allocation reservation info for delalloc */
892 /* In case of bigalloc, these refer to clusters rather than blocks */
893 unsigned int i_reserved_data_blocks;
894 unsigned int i_reserved_meta_blocks;
895 unsigned int i_allocated_meta_blocks;
896 ext4_lblk_t i_da_metadata_calc_last_lblock;
897 int i_da_metadata_calc_len;
898
899 /* on-disk additional length */
900 __u16 i_extra_isize;
901
902 /* Indicate the inline data space. */
903 u16 i_inline_off;
904 u16 i_inline_size;
905
906 #ifdef CONFIG_QUOTA
907 /* quota space reservation, managed internally by quota code */
908 qsize_t i_reserved_quota;
909 #endif
910
911 /* Lock protecting lists below */
912 spinlock_t i_completed_io_lock;
913 /*
914 * Completed IOs that need unwritten extents handling and have
915 * transaction reserved
916 */
917 struct list_head i_rsv_conversion_list;
918 /*
919 * Completed IOs that need unwritten extents handling and don't have
920 * transaction reserved
921 */
922 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
923 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
924 struct work_struct i_rsv_conversion_work;
925
926 spinlock_t i_block_reservation_lock;
927
928 /*
929 * Transactions that contain inode's metadata needed to complete
930 * fsync and fdatasync, respectively.
931 */
932 tid_t i_sync_tid;
933 tid_t i_datasync_tid;
934
935 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
936 __u32 i_csum_seed;
937 };
938
939 /*
940 * File system states
941 */
942 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
943 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
944 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
945
946 /*
947 * Misc. filesystem flags
948 */
949 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
950 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
951 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
952
953 /*
954 * Mount flags set via mount options or defaults
955 */
956 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
957 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
958 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
959 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
960 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
961 #define EXT4_MOUNT_ERRORS_MASK 0x00070
962 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
963 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
964 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
965 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
966 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
967 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
968 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
969 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
970 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
971 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
972 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
973 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
974 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
975 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
976 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
977 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
978 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
979 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
980 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
981 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
982 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
983 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
984 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
985
986 /*
987 * Mount flags set either automatically (could not be set by mount option)
988 * based on per file system feature or property or in special cases such as
989 * distinguishing between explicit mount option definition and default.
990 */
991 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
992 specified delalloc */
993 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
994 size of blocksize * 8
995 blocks */
996 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
997 file systems */
998
999 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1000 ~EXT4_MOUNT_##opt
1001 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1002 EXT4_MOUNT_##opt
1003 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1004 EXT4_MOUNT_##opt)
1005
1006 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1007 ~EXT4_MOUNT2_##opt
1008 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1009 EXT4_MOUNT2_##opt
1010 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1011 EXT4_MOUNT2_##opt)
1012
1013 #define ext4_test_and_set_bit __test_and_set_bit_le
1014 #define ext4_set_bit __set_bit_le
1015 #define ext4_set_bit_atomic ext2_set_bit_atomic
1016 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1017 #define ext4_clear_bit __clear_bit_le
1018 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1019 #define ext4_test_bit test_bit_le
1020 #define ext4_find_next_zero_bit find_next_zero_bit_le
1021 #define ext4_find_next_bit find_next_bit_le
1022
1023 extern void ext4_set_bits(void *bm, int cur, int len);
1024
1025 /*
1026 * Maximal mount counts between two filesystem checks
1027 */
1028 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1029 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1030
1031 /*
1032 * Behaviour when detecting errors
1033 */
1034 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1035 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1036 #define EXT4_ERRORS_PANIC 3 /* Panic */
1037 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1038
1039 /* Metadata checksum algorithm codes */
1040 #define EXT4_CRC32C_CHKSUM 1
1041
1042 /*
1043 * Structure of the super block
1044 */
1045 struct ext4_super_block {
1046 /*00*/ __le32 s_inodes_count; /* Inodes count */
1047 __le32 s_blocks_count_lo; /* Blocks count */
1048 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1049 __le32 s_free_blocks_count_lo; /* Free blocks count */
1050 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1051 __le32 s_first_data_block; /* First Data Block */
1052 __le32 s_log_block_size; /* Block size */
1053 __le32 s_log_cluster_size; /* Allocation cluster size */
1054 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1055 __le32 s_clusters_per_group; /* # Clusters per group */
1056 __le32 s_inodes_per_group; /* # Inodes per group */
1057 __le32 s_mtime; /* Mount time */
1058 /*30*/ __le32 s_wtime; /* Write time */
1059 __le16 s_mnt_count; /* Mount count */
1060 __le16 s_max_mnt_count; /* Maximal mount count */
1061 __le16 s_magic; /* Magic signature */
1062 __le16 s_state; /* File system state */
1063 __le16 s_errors; /* Behaviour when detecting errors */
1064 __le16 s_minor_rev_level; /* minor revision level */
1065 /*40*/ __le32 s_lastcheck; /* time of last check */
1066 __le32 s_checkinterval; /* max. time between checks */
1067 __le32 s_creator_os; /* OS */
1068 __le32 s_rev_level; /* Revision level */
1069 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1070 __le16 s_def_resgid; /* Default gid for reserved blocks */
1071 /*
1072 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1073 *
1074 * Note: the difference between the compatible feature set and
1075 * the incompatible feature set is that if there is a bit set
1076 * in the incompatible feature set that the kernel doesn't
1077 * know about, it should refuse to mount the filesystem.
1078 *
1079 * e2fsck's requirements are more strict; if it doesn't know
1080 * about a feature in either the compatible or incompatible
1081 * feature set, it must abort and not try to meddle with
1082 * things it doesn't understand...
1083 */
1084 __le32 s_first_ino; /* First non-reserved inode */
1085 __le16 s_inode_size; /* size of inode structure */
1086 __le16 s_block_group_nr; /* block group # of this superblock */
1087 __le32 s_feature_compat; /* compatible feature set */
1088 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1089 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1090 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1091 /*78*/ char s_volume_name[16]; /* volume name */
1092 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1093 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1094 /*
1095 * Performance hints. Directory preallocation should only
1096 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1097 */
1098 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1099 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1100 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1101 /*
1102 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1103 */
1104 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1105 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1106 __le32 s_journal_dev; /* device number of journal file */
1107 __le32 s_last_orphan; /* start of list of inodes to delete */
1108 __le32 s_hash_seed[4]; /* HTREE hash seed */
1109 __u8 s_def_hash_version; /* Default hash version to use */
1110 __u8 s_jnl_backup_type;
1111 __le16 s_desc_size; /* size of group descriptor */
1112 /*100*/ __le32 s_default_mount_opts;
1113 __le32 s_first_meta_bg; /* First metablock block group */
1114 __le32 s_mkfs_time; /* When the filesystem was created */
1115 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1116 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1117 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1118 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1119 __le32 s_free_blocks_count_hi; /* Free blocks count */
1120 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1121 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1122 __le32 s_flags; /* Miscellaneous flags */
1123 __le16 s_raid_stride; /* RAID stride */
1124 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1125 __le64 s_mmp_block; /* Block for multi-mount protection */
1126 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1127 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1128 __u8 s_checksum_type; /* metadata checksum algorithm used */
1129 __le16 s_reserved_pad;
1130 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1131 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1132 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1133 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1134 snapshot's future use */
1135 __le32 s_snapshot_list; /* inode number of the head of the
1136 on-disk snapshot list */
1137 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1138 __le32 s_error_count; /* number of fs errors */
1139 __le32 s_first_error_time; /* first time an error happened */
1140 __le32 s_first_error_ino; /* inode involved in first error */
1141 __le64 s_first_error_block; /* block involved of first error */
1142 __u8 s_first_error_func[32]; /* function where the error happened */
1143 __le32 s_first_error_line; /* line number where error happened */
1144 __le32 s_last_error_time; /* most recent time of an error */
1145 __le32 s_last_error_ino; /* inode involved in last error */
1146 __le32 s_last_error_line; /* line number where error happened */
1147 __le64 s_last_error_block; /* block involved of last error */
1148 __u8 s_last_error_func[32]; /* function where the error happened */
1149 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1150 __u8 s_mount_opts[64];
1151 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1152 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1153 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1154 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1155 __le32 s_reserved[106]; /* Padding to the end of the block */
1156 __le32 s_checksum; /* crc32c(superblock) */
1157 };
1158
1159 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1160
1161 #ifdef __KERNEL__
1162
1163 /*
1164 * run-time mount flags
1165 */
1166 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1167 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1168
1169 /* Number of quota types we support */
1170 #define EXT4_MAXQUOTAS 2
1171
1172 /*
1173 * fourth extended-fs super-block data in memory
1174 */
1175 struct ext4_sb_info {
1176 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1177 unsigned long s_inodes_per_block;/* Number of inodes per block */
1178 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1179 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1180 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1181 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1182 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1183 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1184 ext4_group_t s_groups_count; /* Number of groups in the fs */
1185 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1186 unsigned long s_overhead; /* # of fs overhead clusters */
1187 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1188 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1189 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1190 struct buffer_head * s_sbh; /* Buffer containing the super block */
1191 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1192 struct buffer_head **s_group_desc;
1193 unsigned int s_mount_opt;
1194 unsigned int s_mount_opt2;
1195 unsigned int s_mount_flags;
1196 unsigned int s_def_mount_opt;
1197 ext4_fsblk_t s_sb_block;
1198 atomic64_t s_resv_clusters;
1199 kuid_t s_resuid;
1200 kgid_t s_resgid;
1201 unsigned short s_mount_state;
1202 unsigned short s_pad;
1203 int s_addr_per_block_bits;
1204 int s_desc_per_block_bits;
1205 int s_inode_size;
1206 int s_first_ino;
1207 unsigned int s_inode_readahead_blks;
1208 unsigned int s_inode_goal;
1209 spinlock_t s_next_gen_lock;
1210 u32 s_next_generation;
1211 u32 s_hash_seed[4];
1212 int s_def_hash_version;
1213 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1214 struct percpu_counter s_freeclusters_counter;
1215 struct percpu_counter s_freeinodes_counter;
1216 struct percpu_counter s_dirs_counter;
1217 struct percpu_counter s_dirtyclusters_counter;
1218 struct blockgroup_lock *s_blockgroup_lock;
1219 struct proc_dir_entry *s_proc;
1220 struct kobject s_kobj;
1221 struct completion s_kobj_unregister;
1222 struct super_block *s_sb;
1223
1224 /* Journaling */
1225 struct journal_s *s_journal;
1226 struct list_head s_orphan;
1227 struct mutex s_orphan_lock;
1228 unsigned long s_resize_flags; /* Flags indicating if there
1229 is a resizer */
1230 unsigned long s_commit_interval;
1231 u32 s_max_batch_time;
1232 u32 s_min_batch_time;
1233 struct block_device *journal_bdev;
1234 #ifdef CONFIG_QUOTA
1235 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
1236 int s_jquota_fmt; /* Format of quota to use */
1237 #endif
1238 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1239 struct rb_root system_blks;
1240
1241 #ifdef EXTENTS_STATS
1242 /* ext4 extents stats */
1243 unsigned long s_ext_min;
1244 unsigned long s_ext_max;
1245 unsigned long s_depth_max;
1246 spinlock_t s_ext_stats_lock;
1247 unsigned long s_ext_blocks;
1248 unsigned long s_ext_extents;
1249 #endif
1250
1251 /* for buddy allocator */
1252 struct ext4_group_info ***s_group_info;
1253 struct inode *s_buddy_cache;
1254 spinlock_t s_md_lock;
1255 unsigned short *s_mb_offsets;
1256 unsigned int *s_mb_maxs;
1257 unsigned int s_group_info_size;
1258
1259 /* tunables */
1260 unsigned long s_stripe;
1261 unsigned int s_mb_stream_request;
1262 unsigned int s_mb_max_to_scan;
1263 unsigned int s_mb_min_to_scan;
1264 unsigned int s_mb_stats;
1265 unsigned int s_mb_order2_reqs;
1266 unsigned int s_mb_group_prealloc;
1267 unsigned int s_max_dir_size_kb;
1268 /* where last allocation was done - for stream allocation */
1269 unsigned long s_mb_last_group;
1270 unsigned long s_mb_last_start;
1271
1272 /* stats for buddy allocator */
1273 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1274 atomic_t s_bal_success; /* we found long enough chunks */
1275 atomic_t s_bal_allocated; /* in blocks */
1276 atomic_t s_bal_ex_scanned; /* total extents scanned */
1277 atomic_t s_bal_goals; /* goal hits */
1278 atomic_t s_bal_breaks; /* too long searches */
1279 atomic_t s_bal_2orders; /* 2^order hits */
1280 spinlock_t s_bal_lock;
1281 unsigned long s_mb_buddies_generated;
1282 unsigned long long s_mb_generation_time;
1283 atomic_t s_mb_lost_chunks;
1284 atomic_t s_mb_preallocated;
1285 atomic_t s_mb_discarded;
1286 atomic_t s_lock_busy;
1287
1288 /* locality groups */
1289 struct ext4_locality_group __percpu *s_locality_groups;
1290
1291 /* for write statistics */
1292 unsigned long s_sectors_written_start;
1293 u64 s_kbytes_written;
1294
1295 /* the size of zero-out chunk */
1296 unsigned int s_extent_max_zeroout_kb;
1297
1298 unsigned int s_log_groups_per_flex;
1299 struct flex_groups *s_flex_groups;
1300 ext4_group_t s_flex_groups_allocated;
1301
1302 /* workqueue for reserved extent conversions (buffered io) */
1303 struct workqueue_struct *rsv_conversion_wq;
1304
1305 /* timer for periodic error stats printing */
1306 struct timer_list s_err_report;
1307
1308 /* Lazy inode table initialization info */
1309 struct ext4_li_request *s_li_request;
1310 /* Wait multiplier for lazy initialization thread */
1311 unsigned int s_li_wait_mult;
1312
1313 /* Kernel thread for multiple mount protection */
1314 struct task_struct *s_mmp_tsk;
1315
1316 /* record the last minlen when FITRIM is called. */
1317 atomic_t s_last_trim_minblks;
1318
1319 /* Reference to checksum algorithm driver via cryptoapi */
1320 struct crypto_shash *s_chksum_driver;
1321
1322 /* Precomputed FS UUID checksum for seeding other checksums */
1323 __u32 s_csum_seed;
1324
1325 /* Reclaim extents from extent status tree */
1326 struct shrinker s_es_shrinker;
1327 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1328 long s_es_nr_inode;
1329 struct ext4_es_stats s_es_stats;
1330 struct mb_cache *s_mb_cache;
1331 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1332
1333 /* Ratelimit ext4 messages. */
1334 struct ratelimit_state s_err_ratelimit_state;
1335 struct ratelimit_state s_warning_ratelimit_state;
1336 struct ratelimit_state s_msg_ratelimit_state;
1337 };
1338
1339 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1340 {
1341 return sb->s_fs_info;
1342 }
1343 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1344 {
1345 return container_of(inode, struct ext4_inode_info, vfs_inode);
1346 }
1347
1348 static inline struct timespec ext4_current_time(struct inode *inode)
1349 {
1350 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1351 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1352 }
1353
1354 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1355 {
1356 return ino == EXT4_ROOT_INO ||
1357 ino == EXT4_USR_QUOTA_INO ||
1358 ino == EXT4_GRP_QUOTA_INO ||
1359 ino == EXT4_BOOT_LOADER_INO ||
1360 ino == EXT4_JOURNAL_INO ||
1361 ino == EXT4_RESIZE_INO ||
1362 (ino >= EXT4_FIRST_INO(sb) &&
1363 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1364 }
1365
1366 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1367 struct ext4_io_end *io_end)
1368 {
1369 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1370 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1371 atomic_inc(&EXT4_I(inode)->i_unwritten);
1372 }
1373 }
1374
1375 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1376 {
1377 return inode->i_private;
1378 }
1379
1380 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1381 {
1382 inode->i_private = io;
1383 }
1384
1385 /*
1386 * Inode dynamic state flags
1387 */
1388 enum {
1389 EXT4_STATE_JDATA, /* journaled data exists */
1390 EXT4_STATE_NEW, /* inode is newly created */
1391 EXT4_STATE_XATTR, /* has in-inode xattrs */
1392 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1393 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1394 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1395 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1396 EXT4_STATE_NEWENTRY, /* File just added to dir */
1397 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1398 nolocking */
1399 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1400 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1401 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1402 };
1403
1404 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1405 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1406 { \
1407 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1408 } \
1409 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1410 { \
1411 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1412 } \
1413 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1414 { \
1415 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1416 }
1417
1418 /* Add these declarations here only so that these functions can be
1419 * found by name. Otherwise, they are very hard to locate. */
1420 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1421 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1422 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1423 EXT4_INODE_BIT_FNS(flag, flags, 0)
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_state(struct inode *inode, int bit);
1428 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1429 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1430 #if (BITS_PER_LONG < 64)
1431 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1432
1433 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1434 {
1435 (ei)->i_state_flags = 0;
1436 }
1437 #else
1438 EXT4_INODE_BIT_FNS(state, flags, 32)
1439
1440 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1441 {
1442 /* We depend on the fact that callers will set i_flags */
1443 }
1444 #endif
1445 #else
1446 /* Assume that user mode programs are passing in an ext4fs superblock, not
1447 * a kernel struct super_block. This will allow us to call the feature-test
1448 * macros from user land. */
1449 #define EXT4_SB(sb) (sb)
1450 #endif
1451
1452 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1453
1454 /*
1455 * Codes for operating systems
1456 */
1457 #define EXT4_OS_LINUX 0
1458 #define EXT4_OS_HURD 1
1459 #define EXT4_OS_MASIX 2
1460 #define EXT4_OS_FREEBSD 3
1461 #define EXT4_OS_LITES 4
1462
1463 /*
1464 * Revision levels
1465 */
1466 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1467 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1468
1469 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1470 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1471
1472 #define EXT4_GOOD_OLD_INODE_SIZE 128
1473
1474 /*
1475 * Feature set definitions
1476 */
1477
1478 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1479 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1480 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1481 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1482 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1483 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1484 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1485 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1486 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1487 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1488 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1489 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1490 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1491 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1492 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1493 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1494 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1495 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1496
1497 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1498 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1499 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1500 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1501 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1502 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1503 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1504
1505 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1506 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1507 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1508 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1509 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1510 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1511 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1512 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1513 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1514 /*
1515 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1516 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1517 * all other data structures' checksums. However, the METADATA_CSUM and
1518 * GDT_CSUM bits are mutually exclusive.
1519 */
1520 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1521
1522 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1523 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1524 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1525 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1526 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1527 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1528 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1529 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1530 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1531 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1532 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1533 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1534 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1535 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1536
1537 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1538 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1539 EXT4_FEATURE_INCOMPAT_META_BG)
1540 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1541 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1542 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1543
1544 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1545 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1546 EXT4_FEATURE_INCOMPAT_RECOVER| \
1547 EXT4_FEATURE_INCOMPAT_META_BG)
1548 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1549 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1550 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1551
1552 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1553 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1554 EXT4_FEATURE_INCOMPAT_RECOVER| \
1555 EXT4_FEATURE_INCOMPAT_META_BG| \
1556 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1557 EXT4_FEATURE_INCOMPAT_64BIT| \
1558 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1559 EXT4_FEATURE_INCOMPAT_MMP | \
1560 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1561 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1562 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1563 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1564 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1565 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1566 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1567 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1568 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1569 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1570 EXT4_FEATURE_RO_COMPAT_QUOTA)
1571
1572 /*
1573 * Default values for user and/or group using reserved blocks
1574 */
1575 #define EXT4_DEF_RESUID 0
1576 #define EXT4_DEF_RESGID 0
1577
1578 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1579
1580 /*
1581 * Default mount options
1582 */
1583 #define EXT4_DEFM_DEBUG 0x0001
1584 #define EXT4_DEFM_BSDGROUPS 0x0002
1585 #define EXT4_DEFM_XATTR_USER 0x0004
1586 #define EXT4_DEFM_ACL 0x0008
1587 #define EXT4_DEFM_UID16 0x0010
1588 #define EXT4_DEFM_JMODE 0x0060
1589 #define EXT4_DEFM_JMODE_DATA 0x0020
1590 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1591 #define EXT4_DEFM_JMODE_WBACK 0x0060
1592 #define EXT4_DEFM_NOBARRIER 0x0100
1593 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1594 #define EXT4_DEFM_DISCARD 0x0400
1595 #define EXT4_DEFM_NODELALLOC 0x0800
1596
1597 /*
1598 * Default journal batch times
1599 */
1600 #define EXT4_DEF_MIN_BATCH_TIME 0
1601 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1602
1603 /*
1604 * Minimum number of groups in a flexgroup before we separate out
1605 * directories into the first block group of a flexgroup
1606 */
1607 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1608
1609 /*
1610 * Structure of a directory entry
1611 */
1612 #define EXT4_NAME_LEN 255
1613
1614 struct ext4_dir_entry {
1615 __le32 inode; /* Inode number */
1616 __le16 rec_len; /* Directory entry length */
1617 __le16 name_len; /* Name length */
1618 char name[EXT4_NAME_LEN]; /* File name */
1619 };
1620
1621 /*
1622 * The new version of the directory entry. Since EXT4 structures are
1623 * stored in intel byte order, and the name_len field could never be
1624 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1625 * file_type field.
1626 */
1627 struct ext4_dir_entry_2 {
1628 __le32 inode; /* Inode number */
1629 __le16 rec_len; /* Directory entry length */
1630 __u8 name_len; /* Name length */
1631 __u8 file_type;
1632 char name[EXT4_NAME_LEN]; /* File name */
1633 };
1634
1635 /*
1636 * This is a bogus directory entry at the end of each leaf block that
1637 * records checksums.
1638 */
1639 struct ext4_dir_entry_tail {
1640 __le32 det_reserved_zero1; /* Pretend to be unused */
1641 __le16 det_rec_len; /* 12 */
1642 __u8 det_reserved_zero2; /* Zero name length */
1643 __u8 det_reserved_ft; /* 0xDE, fake file type */
1644 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1645 };
1646
1647 #define EXT4_DIRENT_TAIL(block, blocksize) \
1648 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1649 ((blocksize) - \
1650 sizeof(struct ext4_dir_entry_tail))))
1651
1652 /*
1653 * Ext4 directory file types. Only the low 3 bits are used. The
1654 * other bits are reserved for now.
1655 */
1656 #define EXT4_FT_UNKNOWN 0
1657 #define EXT4_FT_REG_FILE 1
1658 #define EXT4_FT_DIR 2
1659 #define EXT4_FT_CHRDEV 3
1660 #define EXT4_FT_BLKDEV 4
1661 #define EXT4_FT_FIFO 5
1662 #define EXT4_FT_SOCK 6
1663 #define EXT4_FT_SYMLINK 7
1664
1665 #define EXT4_FT_MAX 8
1666
1667 #define EXT4_FT_DIR_CSUM 0xDE
1668
1669 /*
1670 * EXT4_DIR_PAD defines the directory entries boundaries
1671 *
1672 * NOTE: It must be a multiple of 4
1673 */
1674 #define EXT4_DIR_PAD 4
1675 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1676 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1677 ~EXT4_DIR_ROUND)
1678 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1679
1680 /*
1681 * If we ever get support for fs block sizes > page_size, we'll need
1682 * to remove the #if statements in the next two functions...
1683 */
1684 static inline unsigned int
1685 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1686 {
1687 unsigned len = le16_to_cpu(dlen);
1688
1689 #if (PAGE_CACHE_SIZE >= 65536)
1690 if (len == EXT4_MAX_REC_LEN || len == 0)
1691 return blocksize;
1692 return (len & 65532) | ((len & 3) << 16);
1693 #else
1694 return len;
1695 #endif
1696 }
1697
1698 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1699 {
1700 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1701 BUG();
1702 #if (PAGE_CACHE_SIZE >= 65536)
1703 if (len < 65536)
1704 return cpu_to_le16(len);
1705 if (len == blocksize) {
1706 if (blocksize == 65536)
1707 return cpu_to_le16(EXT4_MAX_REC_LEN);
1708 else
1709 return cpu_to_le16(0);
1710 }
1711 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1712 #else
1713 return cpu_to_le16(len);
1714 #endif
1715 }
1716
1717 /*
1718 * Hash Tree Directory indexing
1719 * (c) Daniel Phillips, 2001
1720 */
1721
1722 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1723 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1724 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1725 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1726 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1727
1728 /* Legal values for the dx_root hash_version field: */
1729
1730 #define DX_HASH_LEGACY 0
1731 #define DX_HASH_HALF_MD4 1
1732 #define DX_HASH_TEA 2
1733 #define DX_HASH_LEGACY_UNSIGNED 3
1734 #define DX_HASH_HALF_MD4_UNSIGNED 4
1735 #define DX_HASH_TEA_UNSIGNED 5
1736
1737 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1738 const void *address, unsigned int length)
1739 {
1740 struct {
1741 struct shash_desc shash;
1742 char ctx[4];
1743 } desc;
1744 int err;
1745
1746 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1747
1748 desc.shash.tfm = sbi->s_chksum_driver;
1749 desc.shash.flags = 0;
1750 *(u32 *)desc.ctx = crc;
1751
1752 err = crypto_shash_update(&desc.shash, address, length);
1753 BUG_ON(err);
1754
1755 return *(u32 *)desc.ctx;
1756 }
1757
1758 #ifdef __KERNEL__
1759
1760 /* hash info structure used by the directory hash */
1761 struct dx_hash_info
1762 {
1763 u32 hash;
1764 u32 minor_hash;
1765 int hash_version;
1766 u32 *seed;
1767 };
1768
1769
1770 /* 32 and 64 bit signed EOF for dx directories */
1771 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1772 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1773
1774
1775 /*
1776 * Control parameters used by ext4_htree_next_block
1777 */
1778 #define HASH_NB_ALWAYS 1
1779
1780
1781 /*
1782 * Describe an inode's exact location on disk and in memory
1783 */
1784 struct ext4_iloc
1785 {
1786 struct buffer_head *bh;
1787 unsigned long offset;
1788 ext4_group_t block_group;
1789 };
1790
1791 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1792 {
1793 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1794 }
1795
1796 /*
1797 * This structure is stuffed into the struct file's private_data field
1798 * for directories. It is where we put information so that we can do
1799 * readdir operations in hash tree order.
1800 */
1801 struct dir_private_info {
1802 struct rb_root root;
1803 struct rb_node *curr_node;
1804 struct fname *extra_fname;
1805 loff_t last_pos;
1806 __u32 curr_hash;
1807 __u32 curr_minor_hash;
1808 __u32 next_hash;
1809 };
1810
1811 /* calculate the first block number of the group */
1812 static inline ext4_fsblk_t
1813 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1814 {
1815 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1816 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1817 }
1818
1819 /*
1820 * Special error return code only used by dx_probe() and its callers.
1821 */
1822 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
1823
1824 /*
1825 * Timeout and state flag for lazy initialization inode thread.
1826 */
1827 #define EXT4_DEF_LI_WAIT_MULT 10
1828 #define EXT4_DEF_LI_MAX_START_DELAY 5
1829 #define EXT4_LAZYINIT_QUIT 0x0001
1830 #define EXT4_LAZYINIT_RUNNING 0x0002
1831
1832 /*
1833 * Lazy inode table initialization info
1834 */
1835 struct ext4_lazy_init {
1836 unsigned long li_state;
1837 struct list_head li_request_list;
1838 struct mutex li_list_mtx;
1839 };
1840
1841 struct ext4_li_request {
1842 struct super_block *lr_super;
1843 struct ext4_sb_info *lr_sbi;
1844 ext4_group_t lr_next_group;
1845 struct list_head lr_request;
1846 unsigned long lr_next_sched;
1847 unsigned long lr_timeout;
1848 };
1849
1850 struct ext4_features {
1851 struct kobject f_kobj;
1852 struct completion f_kobj_unregister;
1853 };
1854
1855 /*
1856 * This structure will be used for multiple mount protection. It will be
1857 * written into the block number saved in the s_mmp_block field in the
1858 * superblock. Programs that check MMP should assume that if
1859 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1860 * to use the filesystem, regardless of how old the timestamp is.
1861 */
1862 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1863 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1864 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1865 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1866
1867 struct mmp_struct {
1868 __le32 mmp_magic; /* Magic number for MMP */
1869 __le32 mmp_seq; /* Sequence no. updated periodically */
1870
1871 /*
1872 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1873 * purposes and do not affect the correctness of the algorithm
1874 */
1875 __le64 mmp_time; /* Time last updated */
1876 char mmp_nodename[64]; /* Node which last updated MMP block */
1877 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1878
1879 /*
1880 * mmp_check_interval is used to verify if the MMP block has been
1881 * updated on the block device. The value is updated based on the
1882 * maximum time to write the MMP block during an update cycle.
1883 */
1884 __le16 mmp_check_interval;
1885
1886 __le16 mmp_pad1;
1887 __le32 mmp_pad2[226];
1888 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1889 };
1890
1891 /* arguments passed to the mmp thread */
1892 struct mmpd_data {
1893 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1894 struct super_block *sb; /* super block of the fs */
1895 };
1896
1897 /*
1898 * Check interval multiplier
1899 * The MMP block is written every update interval and initially checked every
1900 * update interval x the multiplier (the value is then adapted based on the
1901 * write latency). The reason is that writes can be delayed under load and we
1902 * don't want readers to incorrectly assume that the filesystem is no longer
1903 * in use.
1904 */
1905 #define EXT4_MMP_CHECK_MULT 2UL
1906
1907 /*
1908 * Minimum interval for MMP checking in seconds.
1909 */
1910 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1911
1912 /*
1913 * Maximum interval for MMP checking in seconds.
1914 */
1915 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1916
1917 /*
1918 * Function prototypes
1919 */
1920
1921 /*
1922 * Ok, these declarations are also in <linux/kernel.h> but none of the
1923 * ext4 source programs needs to include it so they are duplicated here.
1924 */
1925 # define NORET_TYPE /**/
1926 # define ATTRIB_NORET __attribute__((noreturn))
1927 # define NORET_AND noreturn,
1928
1929 /* bitmap.c */
1930 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1931 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1932 struct ext4_group_desc *gdp,
1933 struct buffer_head *bh, int sz);
1934 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1935 struct ext4_group_desc *gdp,
1936 struct buffer_head *bh, int sz);
1937 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1938 struct ext4_group_desc *gdp,
1939 struct buffer_head *bh);
1940 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1941 struct ext4_group_desc *gdp,
1942 struct buffer_head *bh);
1943
1944 /* balloc.c */
1945 extern void ext4_get_group_no_and_offset(struct super_block *sb,
1946 ext4_fsblk_t blocknr,
1947 ext4_group_t *blockgrpp,
1948 ext4_grpblk_t *offsetp);
1949 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1950 ext4_fsblk_t block);
1951
1952 extern unsigned int ext4_block_group(struct super_block *sb,
1953 ext4_fsblk_t blocknr);
1954 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1955 ext4_fsblk_t blocknr);
1956 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1957 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1958 ext4_group_t group);
1959 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1960 ext4_fsblk_t goal,
1961 unsigned int flags,
1962 unsigned long *count,
1963 int *errp);
1964 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1965 s64 nclusters, unsigned int flags);
1966 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1967 extern void ext4_check_blocks_bitmap(struct super_block *);
1968 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1969 ext4_group_t block_group,
1970 struct buffer_head ** bh);
1971 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1972
1973 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1974 ext4_group_t block_group);
1975 extern int ext4_wait_block_bitmap(struct super_block *sb,
1976 ext4_group_t block_group,
1977 struct buffer_head *bh);
1978 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1979 ext4_group_t block_group);
1980 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1981 ext4_group_t block_group,
1982 struct ext4_group_desc *gdp);
1983 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1984
1985 /* dir.c */
1986 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1987 struct file *,
1988 struct ext4_dir_entry_2 *,
1989 struct buffer_head *, char *, int,
1990 unsigned int);
1991 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1992 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1993 (de), (bh), (buf), (size), (offset)))
1994 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1995 __u32 minor_hash,
1996 struct ext4_dir_entry_2 *dirent);
1997 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1998 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1999 struct buffer_head *bh,
2000 void *buf, int buf_size,
2001 const char *name, int namelen,
2002 struct ext4_dir_entry_2 **dest_de);
2003 void ext4_insert_dentry(struct inode *inode,
2004 struct ext4_dir_entry_2 *de,
2005 int buf_size,
2006 const char *name, int namelen);
2007 static inline void ext4_update_dx_flag(struct inode *inode)
2008 {
2009 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2010 EXT4_FEATURE_COMPAT_DIR_INDEX))
2011 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2012 }
2013 static unsigned char ext4_filetype_table[] = {
2014 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2015 };
2016
2017 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2018 {
2019 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2020 (filetype >= EXT4_FT_MAX))
2021 return DT_UNKNOWN;
2022
2023 return ext4_filetype_table[filetype];
2024 }
2025 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2026 void *buf, int buf_size);
2027
2028 /* fsync.c */
2029 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2030
2031 /* hash.c */
2032 extern int ext4fs_dirhash(const char *name, int len, struct
2033 dx_hash_info *hinfo);
2034
2035 /* ialloc.c */
2036 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2037 const struct qstr *qstr, __u32 goal,
2038 uid_t *owner, int handle_type,
2039 unsigned int line_no, int nblocks);
2040
2041 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2042 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2043 0, 0, 0)
2044 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2045 type, nblocks) \
2046 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2047 (type), __LINE__, (nblocks))
2048
2049
2050 extern void ext4_free_inode(handle_t *, struct inode *);
2051 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2052 extern unsigned long ext4_count_free_inodes(struct super_block *);
2053 extern unsigned long ext4_count_dirs(struct super_block *);
2054 extern void ext4_check_inodes_bitmap(struct super_block *);
2055 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2056 extern int ext4_init_inode_table(struct super_block *sb,
2057 ext4_group_t group, int barrier);
2058 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2059
2060 /* mballoc.c */
2061 extern long ext4_mb_stats;
2062 extern long ext4_mb_max_to_scan;
2063 extern int ext4_mb_init(struct super_block *);
2064 extern int ext4_mb_release(struct super_block *);
2065 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2066 struct ext4_allocation_request *, int *);
2067 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2068 extern void ext4_discard_preallocations(struct inode *);
2069 extern int __init ext4_init_mballoc(void);
2070 extern void ext4_exit_mballoc(void);
2071 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2072 struct buffer_head *bh, ext4_fsblk_t block,
2073 unsigned long count, int flags);
2074 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2075 ext4_group_t ngroups);
2076 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2077 ext4_group_t i, struct ext4_group_desc *desc);
2078 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2079 ext4_fsblk_t block, unsigned long count);
2080 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2081
2082 /* inode.c */
2083 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2084 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2085 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2086 struct buffer_head *bh_result, int create);
2087 int ext4_get_block(struct inode *inode, sector_t iblock,
2088 struct buffer_head *bh_result, int create);
2089 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2090 struct buffer_head *bh, int create);
2091 int ext4_walk_page_buffers(handle_t *handle,
2092 struct buffer_head *head,
2093 unsigned from,
2094 unsigned to,
2095 int *partial,
2096 int (*fn)(handle_t *handle,
2097 struct buffer_head *bh));
2098 int do_journal_get_write_access(handle_t *handle,
2099 struct buffer_head *bh);
2100 #define FALL_BACK_TO_NONDELALLOC 1
2101 #define CONVERT_INLINE_DATA 2
2102
2103 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2104 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2105 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2106 extern int ext4_setattr(struct dentry *, struct iattr *);
2107 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2108 struct kstat *stat);
2109 extern void ext4_evict_inode(struct inode *);
2110 extern void ext4_clear_inode(struct inode *);
2111 extern int ext4_sync_inode(handle_t *, struct inode *);
2112 extern void ext4_dirty_inode(struct inode *, int);
2113 extern int ext4_change_inode_journal_flag(struct inode *, int);
2114 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2115 extern int ext4_inode_attach_jinode(struct inode *inode);
2116 extern int ext4_can_truncate(struct inode *inode);
2117 extern void ext4_truncate(struct inode *);
2118 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2119 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2120 extern void ext4_set_inode_flags(struct inode *);
2121 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2122 extern int ext4_alloc_da_blocks(struct inode *inode);
2123 extern void ext4_set_aops(struct inode *inode);
2124 extern int ext4_writepage_trans_blocks(struct inode *);
2125 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2126 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2127 loff_t lstart, loff_t lend);
2128 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2129 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2130 extern void ext4_da_update_reserve_space(struct inode *inode,
2131 int used, int quota_claim);
2132
2133 /* indirect.c */
2134 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2135 struct ext4_map_blocks *map, int flags);
2136 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2137 struct iov_iter *iter, loff_t offset);
2138 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2139 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2140 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2141 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2142 ext4_lblk_t start, ext4_lblk_t end);
2143
2144 /* ioctl.c */
2145 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2146 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2147
2148 /* migrate.c */
2149 extern int ext4_ext_migrate(struct inode *);
2150 extern int ext4_ind_migrate(struct inode *inode);
2151
2152 /* namei.c */
2153 extern int ext4_dirent_csum_verify(struct inode *inode,
2154 struct ext4_dir_entry *dirent);
2155 extern int ext4_orphan_add(handle_t *, struct inode *);
2156 extern int ext4_orphan_del(handle_t *, struct inode *);
2157 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2158 __u32 start_minor_hash, __u32 *next_hash);
2159 extern int search_dir(struct buffer_head *bh,
2160 char *search_buf,
2161 int buf_size,
2162 struct inode *dir,
2163 const struct qstr *d_name,
2164 unsigned int offset,
2165 struct ext4_dir_entry_2 **res_dir);
2166 extern int ext4_generic_delete_entry(handle_t *handle,
2167 struct inode *dir,
2168 struct ext4_dir_entry_2 *de_del,
2169 struct buffer_head *bh,
2170 void *entry_buf,
2171 int buf_size,
2172 int csum_size);
2173
2174 /* resize.c */
2175 extern int ext4_group_add(struct super_block *sb,
2176 struct ext4_new_group_data *input);
2177 extern int ext4_group_extend(struct super_block *sb,
2178 struct ext4_super_block *es,
2179 ext4_fsblk_t n_blocks_count);
2180 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2181
2182 /* super.c */
2183 extern int ext4_calculate_overhead(struct super_block *sb);
2184 extern void ext4_superblock_csum_set(struct super_block *sb);
2185 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2186 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2187 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2188 ext4_group_t ngroup);
2189 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2190 char nbuf[16]);
2191
2192 extern __printf(4, 5)
2193 void __ext4_error(struct super_block *, const char *, unsigned int,
2194 const char *, ...);
2195 extern __printf(5, 6)
2196 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2197 const char *, ...);
2198 extern __printf(5, 6)
2199 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2200 const char *, ...);
2201 extern void __ext4_std_error(struct super_block *, const char *,
2202 unsigned int, int);
2203 extern __printf(4, 5)
2204 void __ext4_abort(struct super_block *, const char *, unsigned int,
2205 const char *, ...);
2206 extern __printf(4, 5)
2207 void __ext4_warning(struct super_block *, const char *, unsigned int,
2208 const char *, ...);
2209 extern __printf(3, 4)
2210 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2211 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2212 const char *, unsigned int, const char *);
2213 extern __printf(7, 8)
2214 void __ext4_grp_locked_error(const char *, unsigned int,
2215 struct super_block *, ext4_group_t,
2216 unsigned long, ext4_fsblk_t,
2217 const char *, ...);
2218
2219 #ifdef CONFIG_PRINTK
2220
2221 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2222 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2223 #define ext4_error_file(file, func, line, block, fmt, ...) \
2224 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2225 #define ext4_error(sb, fmt, ...) \
2226 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2227 #define ext4_abort(sb, fmt, ...) \
2228 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2229 #define ext4_warning(sb, fmt, ...) \
2230 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2231 #define ext4_msg(sb, level, fmt, ...) \
2232 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2233 #define dump_mmp_msg(sb, mmp, msg) \
2234 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2235 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2236 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2237 fmt, ##__VA_ARGS__)
2238
2239 #else
2240
2241 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2242 do { \
2243 no_printk(fmt, ##__VA_ARGS__); \
2244 __ext4_error_inode(inode, "", 0, block, " "); \
2245 } while (0)
2246 #define ext4_error_file(file, func, line, block, fmt, ...) \
2247 do { \
2248 no_printk(fmt, ##__VA_ARGS__); \
2249 __ext4_error_file(file, "", 0, block, " "); \
2250 } while (0)
2251 #define ext4_error(sb, fmt, ...) \
2252 do { \
2253 no_printk(fmt, ##__VA_ARGS__); \
2254 __ext4_error(sb, "", 0, " "); \
2255 } while (0)
2256 #define ext4_abort(sb, fmt, ...) \
2257 do { \
2258 no_printk(fmt, ##__VA_ARGS__); \
2259 __ext4_abort(sb, "", 0, " "); \
2260 } while (0)
2261 #define ext4_warning(sb, fmt, ...) \
2262 do { \
2263 no_printk(fmt, ##__VA_ARGS__); \
2264 __ext4_warning(sb, "", 0, " "); \
2265 } while (0)
2266 #define ext4_msg(sb, level, fmt, ...) \
2267 do { \
2268 no_printk(fmt, ##__VA_ARGS__); \
2269 __ext4_msg(sb, "", " "); \
2270 } while (0)
2271 #define dump_mmp_msg(sb, mmp, msg) \
2272 __dump_mmp_msg(sb, mmp, "", 0, "")
2273 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2274 do { \
2275 no_printk(fmt, ##__VA_ARGS__); \
2276 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2277 } while (0)
2278
2279 #endif
2280
2281 extern void ext4_update_dynamic_rev(struct super_block *sb);
2282 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2283 __u32 compat);
2284 extern int ext4_update_rocompat_feature(handle_t *handle,
2285 struct super_block *sb, __u32 rocompat);
2286 extern int ext4_update_incompat_feature(handle_t *handle,
2287 struct super_block *sb, __u32 incompat);
2288 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2289 struct ext4_group_desc *bg);
2290 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2291 struct ext4_group_desc *bg);
2292 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2293 struct ext4_group_desc *bg);
2294 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2295 struct ext4_group_desc *bg);
2296 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2297 struct ext4_group_desc *bg);
2298 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2299 struct ext4_group_desc *bg);
2300 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2301 struct ext4_group_desc *bg);
2302 extern void ext4_block_bitmap_set(struct super_block *sb,
2303 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2304 extern void ext4_inode_bitmap_set(struct super_block *sb,
2305 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2306 extern void ext4_inode_table_set(struct super_block *sb,
2307 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2308 extern void ext4_free_group_clusters_set(struct super_block *sb,
2309 struct ext4_group_desc *bg,
2310 __u32 count);
2311 extern void ext4_free_inodes_set(struct super_block *sb,
2312 struct ext4_group_desc *bg, __u32 count);
2313 extern void ext4_used_dirs_set(struct super_block *sb,
2314 struct ext4_group_desc *bg, __u32 count);
2315 extern void ext4_itable_unused_set(struct super_block *sb,
2316 struct ext4_group_desc *bg, __u32 count);
2317 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2318 struct ext4_group_desc *gdp);
2319 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2320 struct ext4_group_desc *gdp);
2321 extern int ext4_register_li_request(struct super_block *sb,
2322 ext4_group_t first_not_zeroed);
2323
2324 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2325 {
2326 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2327 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
2328 (EXT4_SB(sb)->s_chksum_driver != NULL);
2329 }
2330
2331 static inline int ext4_has_metadata_csum(struct super_block *sb)
2332 {
2333 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
2334 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
2335 !EXT4_SB(sb)->s_chksum_driver);
2336
2337 return (EXT4_SB(sb)->s_chksum_driver != NULL);
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 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2458 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2459 {
2460 int changed = 0;
2461
2462 if (newsize > inode->i_size) {
2463 i_size_write(inode, newsize);
2464 changed = 1;
2465 }
2466 if (newsize > EXT4_I(inode)->i_disksize) {
2467 ext4_update_i_disksize(inode, newsize);
2468 changed |= 2;
2469 }
2470 return changed;
2471 }
2472
2473 struct ext4_group_info {
2474 unsigned long bb_state;
2475 struct rb_root bb_free_root;
2476 ext4_grpblk_t bb_first_free; /* first free block */
2477 ext4_grpblk_t bb_free; /* total free blocks */
2478 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2479 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2480 struct list_head bb_prealloc_list;
2481 #ifdef DOUBLE_CHECK
2482 void *bb_bitmap;
2483 #endif
2484 struct rw_semaphore alloc_sem;
2485 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2486 * regions, index is order.
2487 * bb_counters[3] = 5 means
2488 * 5 free 8-block regions. */
2489 };
2490
2491 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2492 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2493 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2494 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2495
2496 #define EXT4_MB_GRP_NEED_INIT(grp) \
2497 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2498 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2499 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2500 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2501 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2502
2503 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2504 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2505 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2506 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2507 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2508 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2509
2510 #define EXT4_MAX_CONTENTION 8
2511 #define EXT4_CONTENTION_THRESHOLD 2
2512
2513 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2514 ext4_group_t group)
2515 {
2516 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2517 }
2518
2519 /*
2520 * Returns true if the filesystem is busy enough that attempts to
2521 * access the block group locks has run into contention.
2522 */
2523 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2524 {
2525 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2526 }
2527
2528 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2529 {
2530 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2531 if (spin_trylock(lock))
2532 /*
2533 * We're able to grab the lock right away, so drop the
2534 * lock contention counter.
2535 */
2536 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2537 else {
2538 /*
2539 * The lock is busy, so bump the contention counter,
2540 * and then wait on the spin lock.
2541 */
2542 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2543 EXT4_MAX_CONTENTION);
2544 spin_lock(lock);
2545 }
2546 }
2547
2548 static inline void ext4_unlock_group(struct super_block *sb,
2549 ext4_group_t group)
2550 {
2551 spin_unlock(ext4_group_lock_ptr(sb, group));
2552 }
2553
2554 /*
2555 * Block validity checking
2556 */
2557 #define ext4_check_indirect_blockref(inode, bh) \
2558 ext4_check_blockref(__func__, __LINE__, inode, \
2559 (__le32 *)(bh)->b_data, \
2560 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2561
2562 #define ext4_ind_check_inode(inode) \
2563 ext4_check_blockref(__func__, __LINE__, inode, \
2564 EXT4_I(inode)->i_data, \
2565 EXT4_NDIR_BLOCKS)
2566
2567 /*
2568 * Inodes and files operations
2569 */
2570
2571 /* dir.c */
2572 extern const struct file_operations ext4_dir_operations;
2573
2574 /* file.c */
2575 extern const struct inode_operations ext4_file_inode_operations;
2576 extern const struct file_operations ext4_file_operations;
2577 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2578
2579 /* inline.c */
2580 extern int ext4_get_max_inline_size(struct inode *inode);
2581 extern int ext4_find_inline_data_nolock(struct inode *inode);
2582 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2583 unsigned int len);
2584 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2585
2586 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2587 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2588 struct inode *inode,
2589 loff_t pos, unsigned len,
2590 unsigned flags,
2591 struct page **pagep);
2592 extern int ext4_write_inline_data_end(struct inode *inode,
2593 loff_t pos, unsigned len,
2594 unsigned copied,
2595 struct page *page);
2596 extern struct buffer_head *
2597 ext4_journalled_write_inline_data(struct inode *inode,
2598 unsigned len,
2599 struct page *page);
2600 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2601 struct inode *inode,
2602 loff_t pos, unsigned len,
2603 unsigned flags,
2604 struct page **pagep,
2605 void **fsdata);
2606 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2607 unsigned len, unsigned copied,
2608 struct page *page);
2609 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2610 struct inode *inode);
2611 extern int ext4_try_create_inline_dir(handle_t *handle,
2612 struct inode *parent,
2613 struct inode *inode);
2614 extern int ext4_read_inline_dir(struct file *filp,
2615 struct dir_context *ctx,
2616 int *has_inline_data);
2617 extern int htree_inlinedir_to_tree(struct file *dir_file,
2618 struct inode *dir, ext4_lblk_t block,
2619 struct dx_hash_info *hinfo,
2620 __u32 start_hash, __u32 start_minor_hash,
2621 int *has_inline_data);
2622 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2623 const struct qstr *d_name,
2624 struct ext4_dir_entry_2 **res_dir,
2625 int *has_inline_data);
2626 extern int ext4_delete_inline_entry(handle_t *handle,
2627 struct inode *dir,
2628 struct ext4_dir_entry_2 *de_del,
2629 struct buffer_head *bh,
2630 int *has_inline_data);
2631 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2632 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2633 struct ext4_dir_entry_2 **parent_de,
2634 int *retval);
2635 extern int ext4_inline_data_fiemap(struct inode *inode,
2636 struct fiemap_extent_info *fieinfo,
2637 int *has_inline, __u64 start, __u64 len);
2638 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2639 struct inode *inode,
2640 int needed);
2641 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2642
2643 extern int ext4_convert_inline_data(struct inode *inode);
2644
2645 static inline int ext4_has_inline_data(struct inode *inode)
2646 {
2647 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2648 EXT4_I(inode)->i_inline_off;
2649 }
2650
2651 /* namei.c */
2652 extern const struct inode_operations ext4_dir_inode_operations;
2653 extern const struct inode_operations ext4_special_inode_operations;
2654 extern struct dentry *ext4_get_parent(struct dentry *child);
2655 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2656 struct ext4_dir_entry_2 *de,
2657 int blocksize, int csum_size,
2658 unsigned int parent_ino, int dotdot_real_len);
2659 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2660 unsigned int blocksize);
2661 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2662 struct inode *inode,
2663 struct buffer_head *bh);
2664 #define S_SHIFT 12
2665 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2666 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2667 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2668 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2669 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2670 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2671 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2672 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2673 };
2674
2675 static inline void ext4_set_de_type(struct super_block *sb,
2676 struct ext4_dir_entry_2 *de,
2677 umode_t mode) {
2678 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2679 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2680 }
2681
2682
2683 /* symlink.c */
2684 extern const struct inode_operations ext4_symlink_inode_operations;
2685 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2686
2687 /* block_validity */
2688 extern void ext4_release_system_zone(struct super_block *sb);
2689 extern int ext4_setup_system_zone(struct super_block *sb);
2690 extern int __init ext4_init_system_zone(void);
2691 extern void ext4_exit_system_zone(void);
2692 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2693 ext4_fsblk_t start_blk,
2694 unsigned int count);
2695 extern int ext4_check_blockref(const char *, unsigned int,
2696 struct inode *, __le32 *, unsigned int);
2697
2698 /* extents.c */
2699 struct ext4_ext_path;
2700 struct ext4_extent;
2701
2702 /*
2703 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2704 * __le32.
2705 */
2706 #define EXT_MAX_BLOCKS 0xffffffff
2707
2708 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2709 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2710 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2711 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2712 struct ext4_map_blocks *map, int flags);
2713 extern void ext4_ext_truncate(handle_t *, struct inode *);
2714 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2715 ext4_lblk_t end);
2716 extern void ext4_ext_init(struct super_block *);
2717 extern void ext4_ext_release(struct super_block *);
2718 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2719 loff_t len);
2720 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2721 loff_t offset, ssize_t len);
2722 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2723 struct ext4_map_blocks *map, int flags);
2724 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2725 ext4_lblk_t lblocks);
2726 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2727 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2728 int num,
2729 struct ext4_ext_path *path);
2730 extern int ext4_can_extents_be_merged(struct inode *inode,
2731 struct ext4_extent *ex1,
2732 struct ext4_extent *ex2);
2733 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2734 struct ext4_ext_path **,
2735 struct ext4_extent *, int);
2736 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
2737 struct ext4_ext_path **,
2738 int flags);
2739 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2740 extern int ext4_ext_check_inode(struct inode *inode);
2741 extern int ext4_find_delalloc_range(struct inode *inode,
2742 ext4_lblk_t lblk_start,
2743 ext4_lblk_t lblk_end);
2744 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2745 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
2746 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2747 __u64 start, __u64 len);
2748 extern int ext4_ext_precache(struct inode *inode);
2749 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2750 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
2751 struct inode *inode2, ext4_lblk_t lblk1,
2752 ext4_lblk_t lblk2, ext4_lblk_t count,
2753 int mark_unwritten,int *err);
2754
2755 /* move_extent.c */
2756 extern void ext4_double_down_write_data_sem(struct inode *first,
2757 struct inode *second);
2758 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2759 struct inode *donor_inode);
2760 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2761 __u64 start_orig, __u64 start_donor,
2762 __u64 len, __u64 *moved_len);
2763
2764 /* page-io.c */
2765 extern int __init ext4_init_pageio(void);
2766 extern void ext4_exit_pageio(void);
2767 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2768 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2769 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2770 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2771 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2772 struct writeback_control *wbc);
2773 extern void ext4_end_io_rsv_work(struct work_struct *work);
2774 extern void ext4_io_submit(struct ext4_io_submit *io);
2775 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2776 struct page *page,
2777 int len,
2778 struct writeback_control *wbc,
2779 bool keep_towrite);
2780
2781 /* mmp.c */
2782 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2783
2784 /*
2785 * Add new method to test whether block and inode bitmaps are properly
2786 * initialized. With uninit_bg reading the block from disk is not enough
2787 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2788 */
2789 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2790
2791 static inline int bitmap_uptodate(struct buffer_head *bh)
2792 {
2793 return (buffer_uptodate(bh) &&
2794 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2795 }
2796 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2797 {
2798 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2799 }
2800
2801 /*
2802 * Disable DIO read nolock optimization, so new dioreaders will be forced
2803 * to grab i_mutex
2804 */
2805 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2806 {
2807 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2808 smp_mb();
2809 }
2810 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2811 {
2812 smp_mb();
2813 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2814 }
2815
2816 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2817
2818 /* For ioend & aio unwritten conversion wait queues */
2819 #define EXT4_WQ_HASH_SZ 37
2820 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2821 EXT4_WQ_HASH_SZ])
2822 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2823 EXT4_WQ_HASH_SZ])
2824 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2825 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2826
2827 #define EXT4_RESIZING 0
2828 extern int ext4_resize_begin(struct super_block *sb);
2829 extern void ext4_resize_end(struct super_block *sb);
2830
2831 #endif /* __KERNEL__ */
2832
2833 #endif /* _EXT4_H */
Linux kernel - Deliverables
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