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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[mirror_ubuntu-bionic-kernel.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 /* nb: was previously EXT2_ECOMPR_FL */
368 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
369 /* End compression flags --- maybe not all used */
370 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
371 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
372 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
373 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
374 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
375 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
376 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
377 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
378 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
379 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
380 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
381 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
382
383 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
384 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
385
386 /* Flags that should be inherited by new inodes from their parent. */
387 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
388 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
389 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
390 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
391
392 /* Flags that are appropriate for regular files (all but dir-specific ones). */
393 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
394
395 /* Flags that are appropriate for non-directories/regular files. */
396 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
397
398 /* Mask out flags that are inappropriate for the given type of inode. */
399 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
400 {
401 if (S_ISDIR(mode))
402 return flags;
403 else if (S_ISREG(mode))
404 return flags & EXT4_REG_FLMASK;
405 else
406 return flags & EXT4_OTHER_FLMASK;
407 }
408
409 /*
410 * Inode flags used for atomic set/get
411 */
412 enum {
413 EXT4_INODE_SECRM = 0, /* Secure deletion */
414 EXT4_INODE_UNRM = 1, /* Undelete */
415 EXT4_INODE_COMPR = 2, /* Compress file */
416 EXT4_INODE_SYNC = 3, /* Synchronous updates */
417 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
418 EXT4_INODE_APPEND = 5, /* writes to file may only append */
419 EXT4_INODE_NODUMP = 6, /* do not dump file */
420 EXT4_INODE_NOATIME = 7, /* do not update atime */
421 /* Reserved for compression usage... */
422 EXT4_INODE_DIRTY = 8,
423 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
424 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
425 EXT4_INODE_ENCRYPT = 11, /* Compression error */
426 /* End compression flags --- maybe not all used */
427 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
428 EXT4_INODE_IMAGIC = 13, /* AFS directory */
429 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
430 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
431 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
432 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
433 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
434 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
435 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
436 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
437 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
438 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
439 };
440
441 /*
442 * Since it's pretty easy to mix up bit numbers and hex values, we use a
443 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
444 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
445 * any extra space in the compiled kernel image, otherwise, the build will fail.
446 * It's important that these values are the same, since we are using
447 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
448 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
449 * values found in ext2, ext3 and ext4 filesystems, and of course the values
450 * defined in e2fsprogs.
451 *
452 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
453 */
454 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
455 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
456
457 static inline void ext4_check_flag_values(void)
458 {
459 CHECK_FLAG_VALUE(SECRM);
460 CHECK_FLAG_VALUE(UNRM);
461 CHECK_FLAG_VALUE(COMPR);
462 CHECK_FLAG_VALUE(SYNC);
463 CHECK_FLAG_VALUE(IMMUTABLE);
464 CHECK_FLAG_VALUE(APPEND);
465 CHECK_FLAG_VALUE(NODUMP);
466 CHECK_FLAG_VALUE(NOATIME);
467 CHECK_FLAG_VALUE(DIRTY);
468 CHECK_FLAG_VALUE(COMPRBLK);
469 CHECK_FLAG_VALUE(NOCOMPR);
470 CHECK_FLAG_VALUE(ENCRYPT);
471 CHECK_FLAG_VALUE(INDEX);
472 CHECK_FLAG_VALUE(IMAGIC);
473 CHECK_FLAG_VALUE(JOURNAL_DATA);
474 CHECK_FLAG_VALUE(NOTAIL);
475 CHECK_FLAG_VALUE(DIRSYNC);
476 CHECK_FLAG_VALUE(TOPDIR);
477 CHECK_FLAG_VALUE(HUGE_FILE);
478 CHECK_FLAG_VALUE(EXTENTS);
479 CHECK_FLAG_VALUE(EA_INODE);
480 CHECK_FLAG_VALUE(EOFBLOCKS);
481 CHECK_FLAG_VALUE(INLINE_DATA);
482 CHECK_FLAG_VALUE(RESERVED);
483 }
484
485 /* Used to pass group descriptor data when online resize is done */
486 struct ext4_new_group_input {
487 __u32 group; /* Group number for this data */
488 __u64 block_bitmap; /* Absolute block number of block bitmap */
489 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
490 __u64 inode_table; /* Absolute block number of inode table start */
491 __u32 blocks_count; /* Total number of blocks in this group */
492 __u16 reserved_blocks; /* Number of reserved blocks in this group */
493 __u16 unused;
494 };
495
496 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
497 struct compat_ext4_new_group_input {
498 u32 group;
499 compat_u64 block_bitmap;
500 compat_u64 inode_bitmap;
501 compat_u64 inode_table;
502 u32 blocks_count;
503 u16 reserved_blocks;
504 u16 unused;
505 };
506 #endif
507
508 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
509 struct ext4_new_group_data {
510 __u32 group;
511 __u64 block_bitmap;
512 __u64 inode_bitmap;
513 __u64 inode_table;
514 __u32 blocks_count;
515 __u16 reserved_blocks;
516 __u16 unused;
517 __u32 free_blocks_count;
518 };
519
520 /* Indexes used to index group tables in ext4_new_group_data */
521 enum {
522 BLOCK_BITMAP = 0, /* block bitmap */
523 INODE_BITMAP, /* inode bitmap */
524 INODE_TABLE, /* inode tables */
525 GROUP_TABLE_COUNT,
526 };
527
528 /*
529 * Flags used by ext4_map_blocks()
530 */
531 /* Allocate any needed blocks and/or convert an unwritten
532 extent to be an initialized ext4 */
533 #define EXT4_GET_BLOCKS_CREATE 0x0001
534 /* Request the creation of an unwritten extent */
535 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
536 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
537 EXT4_GET_BLOCKS_CREATE)
538 /* Caller is from the delayed allocation writeout path
539 * finally doing the actual allocation of delayed blocks */
540 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
541 /* caller is from the direct IO path, request to creation of an
542 unwritten extents if not allocated, split the unwritten
543 extent if blocks has been preallocated already*/
544 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
545 #define EXT4_GET_BLOCKS_CONVERT 0x0010
546 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
547 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
548 /* Convert extent to initialized after IO complete */
549 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
550 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
551 /* Eventual metadata allocation (due to growing extent tree)
552 * should not fail, so try to use reserved blocks for that.*/
553 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
554 /* Don't normalize allocation size (used for fallocate) */
555 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
556 /* Request will not result in inode size update (user for fallocate) */
557 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
558 /* Do not take i_data_sem locking in ext4_map_blocks */
559 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
560 /* Convert written extents to unwritten */
561 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
562
563 /*
564 * The bit position of these flags must not overlap with any of the
565 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
566 * read_extent_tree_block(), ext4_split_extent_at(),
567 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
568 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
569 * caching the extents when reading from the extent tree while a
570 * truncate or punch hole operation is in progress.
571 */
572 #define EXT4_EX_NOCACHE 0x40000000
573 #define EXT4_EX_FORCE_CACHE 0x20000000
574
575 /*
576 * Flags used by ext4_free_blocks
577 */
578 #define EXT4_FREE_BLOCKS_METADATA 0x0001
579 #define EXT4_FREE_BLOCKS_FORGET 0x0002
580 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
581 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
582 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
583 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
584
585 /*
586 * ioctl commands
587 */
588 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
589 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
590 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
591 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
592 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
593 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
594 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
595 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
596 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
597 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
598 #define EXT4_IOC_MIGRATE _IO('f', 9)
599 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
600 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
601 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
602 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
603 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
604 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
605 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
606
607 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
608 /*
609 * ioctl commands in 32 bit emulation
610 */
611 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
612 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
613 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
614 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
615 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
616 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
617 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
618 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
619 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
620 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
621 #endif
622
623 /* Max physical block we can address w/o extents */
624 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
625
626 /*
627 * Structure of an inode on the disk
628 */
629 struct ext4_inode {
630 __le16 i_mode; /* File mode */
631 __le16 i_uid; /* Low 16 bits of Owner Uid */
632 __le32 i_size_lo; /* Size in bytes */
633 __le32 i_atime; /* Access time */
634 __le32 i_ctime; /* Inode Change time */
635 __le32 i_mtime; /* Modification time */
636 __le32 i_dtime; /* Deletion Time */
637 __le16 i_gid; /* Low 16 bits of Group Id */
638 __le16 i_links_count; /* Links count */
639 __le32 i_blocks_lo; /* Blocks count */
640 __le32 i_flags; /* File flags */
641 union {
642 struct {
643 __le32 l_i_version;
644 } linux1;
645 struct {
646 __u32 h_i_translator;
647 } hurd1;
648 struct {
649 __u32 m_i_reserved1;
650 } masix1;
651 } osd1; /* OS dependent 1 */
652 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
653 __le32 i_generation; /* File version (for NFS) */
654 __le32 i_file_acl_lo; /* File ACL */
655 __le32 i_size_high;
656 __le32 i_obso_faddr; /* Obsoleted fragment address */
657 union {
658 struct {
659 __le16 l_i_blocks_high; /* were l_i_reserved1 */
660 __le16 l_i_file_acl_high;
661 __le16 l_i_uid_high; /* these 2 fields */
662 __le16 l_i_gid_high; /* were reserved2[0] */
663 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
664 __le16 l_i_reserved;
665 } linux2;
666 struct {
667 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
668 __u16 h_i_mode_high;
669 __u16 h_i_uid_high;
670 __u16 h_i_gid_high;
671 __u32 h_i_author;
672 } hurd2;
673 struct {
674 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
675 __le16 m_i_file_acl_high;
676 __u32 m_i_reserved2[2];
677 } masix2;
678 } osd2; /* OS dependent 2 */
679 __le16 i_extra_isize;
680 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
681 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
682 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
683 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
684 __le32 i_crtime; /* File Creation time */
685 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
686 __le32 i_version_hi; /* high 32 bits for 64-bit version */
687 };
688
689 struct move_extent {
690 __u32 reserved; /* should be zero */
691 __u32 donor_fd; /* donor file descriptor */
692 __u64 orig_start; /* logical start offset in block for orig */
693 __u64 donor_start; /* logical start offset in block for donor */
694 __u64 len; /* block length to be moved */
695 __u64 moved_len; /* moved block length */
696 };
697
698 #define EXT4_EPOCH_BITS 2
699 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
700 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
701
702 /*
703 * Extended fields will fit into an inode if the filesystem was formatted
704 * with large inodes (-I 256 or larger) and there are not currently any EAs
705 * consuming all of the available space. For new inodes we always reserve
706 * enough space for the kernel's known extended fields, but for inodes
707 * created with an old kernel this might not have been the case. None of
708 * the extended inode fields is critical for correct filesystem operation.
709 * This macro checks if a certain field fits in the inode. Note that
710 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
711 */
712 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
713 ((offsetof(typeof(*ext4_inode), field) + \
714 sizeof((ext4_inode)->field)) \
715 <= (EXT4_GOOD_OLD_INODE_SIZE + \
716 (einode)->i_extra_isize)) \
717
718 static inline __le32 ext4_encode_extra_time(struct timespec *time)
719 {
720 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
721 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
722 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
723 }
724
725 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
726 {
727 if (sizeof(time->tv_sec) > 4)
728 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
729 << 32;
730 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
731 }
732
733 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
734 do { \
735 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
736 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
737 (raw_inode)->xtime ## _extra = \
738 ext4_encode_extra_time(&(inode)->xtime); \
739 } while (0)
740
741 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
742 do { \
743 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
744 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
745 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
746 (raw_inode)->xtime ## _extra = \
747 ext4_encode_extra_time(&(einode)->xtime); \
748 } while (0)
749
750 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
751 do { \
752 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
753 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
754 ext4_decode_extra_time(&(inode)->xtime, \
755 raw_inode->xtime ## _extra); \
756 else \
757 (inode)->xtime.tv_nsec = 0; \
758 } while (0)
759
760 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
761 do { \
762 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
763 (einode)->xtime.tv_sec = \
764 (signed)le32_to_cpu((raw_inode)->xtime); \
765 else \
766 (einode)->xtime.tv_sec = 0; \
767 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
768 ext4_decode_extra_time(&(einode)->xtime, \
769 raw_inode->xtime ## _extra); \
770 else \
771 (einode)->xtime.tv_nsec = 0; \
772 } while (0)
773
774 #define i_disk_version osd1.linux1.l_i_version
775
776 #if defined(__KERNEL__) || defined(__linux__)
777 #define i_reserved1 osd1.linux1.l_i_reserved1
778 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
779 #define i_blocks_high osd2.linux2.l_i_blocks_high
780 #define i_uid_low i_uid
781 #define i_gid_low i_gid
782 #define i_uid_high osd2.linux2.l_i_uid_high
783 #define i_gid_high osd2.linux2.l_i_gid_high
784 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
785
786 #elif defined(__GNU__)
787
788 #define i_translator osd1.hurd1.h_i_translator
789 #define i_uid_high osd2.hurd2.h_i_uid_high
790 #define i_gid_high osd2.hurd2.h_i_gid_high
791 #define i_author osd2.hurd2.h_i_author
792
793 #elif defined(__masix__)
794
795 #define i_reserved1 osd1.masix1.m_i_reserved1
796 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
797 #define i_reserved2 osd2.masix2.m_i_reserved2
798
799 #endif /* defined(__KERNEL__) || defined(__linux__) */
800
801 #include "extents_status.h"
802
803 /*
804 * fourth extended file system inode data in memory
805 */
806 struct ext4_inode_info {
807 __le32 i_data[15]; /* unconverted */
808 __u32 i_dtime;
809 ext4_fsblk_t i_file_acl;
810
811 /*
812 * i_block_group is the number of the block group which contains
813 * this file's inode. Constant across the lifetime of the inode,
814 * it is ued for making block allocation decisions - we try to
815 * place a file's data blocks near its inode block, and new inodes
816 * near to their parent directory's inode.
817 */
818 ext4_group_t i_block_group;
819 ext4_lblk_t i_dir_start_lookup;
820 #if (BITS_PER_LONG < 64)
821 unsigned long i_state_flags; /* Dynamic state flags */
822 #endif
823 unsigned long i_flags;
824
825 /*
826 * Extended attributes can be read independently of the main file
827 * data. Taking i_mutex even when reading would cause contention
828 * between readers of EAs and writers of regular file data, so
829 * instead we synchronize on xattr_sem when reading or changing
830 * EAs.
831 */
832 struct rw_semaphore xattr_sem;
833
834 struct list_head i_orphan; /* unlinked but open inodes */
835
836 /*
837 * i_disksize keeps track of what the inode size is ON DISK, not
838 * in memory. During truncate, i_size is set to the new size by
839 * the VFS prior to calling ext4_truncate(), but the filesystem won't
840 * set i_disksize to 0 until the truncate is actually under way.
841 *
842 * The intent is that i_disksize always represents the blocks which
843 * are used by this file. This allows recovery to restart truncate
844 * on orphans if we crash during truncate. We actually write i_disksize
845 * into the on-disk inode when writing inodes out, instead of i_size.
846 *
847 * The only time when i_disksize and i_size may be different is when
848 * a truncate is in progress. The only things which change i_disksize
849 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
850 */
851 loff_t i_disksize;
852
853 /*
854 * i_data_sem is for serialising ext4_truncate() against
855 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
856 * data tree are chopped off during truncate. We can't do that in
857 * ext4 because whenever we perform intermediate commits during
858 * truncate, the inode and all the metadata blocks *must* be in a
859 * consistent state which allows truncation of the orphans to restart
860 * during recovery. Hence we must fix the get_block-vs-truncate race
861 * by other means, so we have i_data_sem.
862 */
863 struct rw_semaphore i_data_sem;
864 struct inode vfs_inode;
865 struct jbd2_inode *jinode;
866
867 spinlock_t i_raw_lock; /* protects updates to the raw inode */
868
869 /*
870 * File creation time. Its function is same as that of
871 * struct timespec i_{a,c,m}time in the generic inode.
872 */
873 struct timespec i_crtime;
874
875 /* mballoc */
876 struct list_head i_prealloc_list;
877 spinlock_t i_prealloc_lock;
878
879 /* extents status tree */
880 struct ext4_es_tree i_es_tree;
881 rwlock_t i_es_lock;
882 struct list_head i_es_list;
883 unsigned int i_es_all_nr; /* protected by i_es_lock */
884 unsigned int i_es_shk_nr; /* protected by i_es_lock */
885 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
886 extents to shrink. Protected by
887 i_es_lock */
888
889 /* ialloc */
890 ext4_group_t i_last_alloc_group;
891
892 /* allocation reservation info for delalloc */
893 /* In case of bigalloc, these refer to clusters rather than blocks */
894 unsigned int i_reserved_data_blocks;
895 unsigned int i_reserved_meta_blocks;
896 unsigned int i_allocated_meta_blocks;
897 ext4_lblk_t i_da_metadata_calc_last_lblock;
898 int i_da_metadata_calc_len;
899
900 /* on-disk additional length */
901 __u16 i_extra_isize;
902
903 /* Indicate the inline data space. */
904 u16 i_inline_off;
905 u16 i_inline_size;
906
907 #ifdef CONFIG_QUOTA
908 /* quota space reservation, managed internally by quota code */
909 qsize_t i_reserved_quota;
910 #endif
911
912 /* Lock protecting lists below */
913 spinlock_t i_completed_io_lock;
914 /*
915 * Completed IOs that need unwritten extents handling and have
916 * transaction reserved
917 */
918 struct list_head i_rsv_conversion_list;
919 /*
920 * Completed IOs that need unwritten extents handling and don't have
921 * transaction reserved
922 */
923 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
924 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
925 struct work_struct i_rsv_conversion_work;
926
927 spinlock_t i_block_reservation_lock;
928
929 /*
930 * Transactions that contain inode's metadata needed to complete
931 * fsync and fdatasync, respectively.
932 */
933 tid_t i_sync_tid;
934 tid_t i_datasync_tid;
935
936 #ifdef CONFIG_QUOTA
937 struct dquot *i_dquot[MAXQUOTAS];
938 #endif
939
940 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
941 __u32 i_csum_seed;
942 };
943
944 /*
945 * File system states
946 */
947 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
948 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
949 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
950
951 /*
952 * Misc. filesystem flags
953 */
954 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
955 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
956 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
957
958 /*
959 * Mount flags set via mount options or defaults
960 */
961 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
962 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
963 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
964 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
965 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
966 #define EXT4_MOUNT_ERRORS_MASK 0x00070
967 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
968 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
969 #ifdef CONFIG_FS_DAX
970 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
971 #else
972 #define EXT4_MOUNT_DAX 0
973 #endif
974 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
975 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
976 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
977 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
978 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
979 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
980 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
981 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
982 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
983 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
984 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
985 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
986 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
987 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
988 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
989 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
990 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
991 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
992 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
993 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
994 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
995
996 /*
997 * Mount flags set either automatically (could not be set by mount option)
998 * based on per file system feature or property or in special cases such as
999 * distinguishing between explicit mount option definition and default.
1000 */
1001 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1002 specified delalloc */
1003 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1004 size of blocksize * 8
1005 blocks */
1006 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1007 file systems */
1008
1009 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1010 ~EXT4_MOUNT_##opt
1011 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1012 EXT4_MOUNT_##opt
1013 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1014 EXT4_MOUNT_##opt)
1015
1016 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1017 ~EXT4_MOUNT2_##opt
1018 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1019 EXT4_MOUNT2_##opt
1020 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1021 EXT4_MOUNT2_##opt)
1022
1023 #define ext4_test_and_set_bit __test_and_set_bit_le
1024 #define ext4_set_bit __set_bit_le
1025 #define ext4_set_bit_atomic ext2_set_bit_atomic
1026 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1027 #define ext4_clear_bit __clear_bit_le
1028 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1029 #define ext4_test_bit test_bit_le
1030 #define ext4_find_next_zero_bit find_next_zero_bit_le
1031 #define ext4_find_next_bit find_next_bit_le
1032
1033 extern void ext4_set_bits(void *bm, int cur, int len);
1034
1035 /*
1036 * Maximal mount counts between two filesystem checks
1037 */
1038 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1039 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1040
1041 /*
1042 * Behaviour when detecting errors
1043 */
1044 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1045 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1046 #define EXT4_ERRORS_PANIC 3 /* Panic */
1047 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1048
1049 /* Metadata checksum algorithm codes */
1050 #define EXT4_CRC32C_CHKSUM 1
1051
1052 /* Encryption algorithms */
1053 #define EXT4_ENCRYPTION_MODE_INVALID 0
1054 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
1055 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
1056 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
1057
1058 /*
1059 * Structure of the super block
1060 */
1061 struct ext4_super_block {
1062 /*00*/ __le32 s_inodes_count; /* Inodes count */
1063 __le32 s_blocks_count_lo; /* Blocks count */
1064 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1065 __le32 s_free_blocks_count_lo; /* Free blocks count */
1066 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1067 __le32 s_first_data_block; /* First Data Block */
1068 __le32 s_log_block_size; /* Block size */
1069 __le32 s_log_cluster_size; /* Allocation cluster size */
1070 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1071 __le32 s_clusters_per_group; /* # Clusters per group */
1072 __le32 s_inodes_per_group; /* # Inodes per group */
1073 __le32 s_mtime; /* Mount time */
1074 /*30*/ __le32 s_wtime; /* Write time */
1075 __le16 s_mnt_count; /* Mount count */
1076 __le16 s_max_mnt_count; /* Maximal mount count */
1077 __le16 s_magic; /* Magic signature */
1078 __le16 s_state; /* File system state */
1079 __le16 s_errors; /* Behaviour when detecting errors */
1080 __le16 s_minor_rev_level; /* minor revision level */
1081 /*40*/ __le32 s_lastcheck; /* time of last check */
1082 __le32 s_checkinterval; /* max. time between checks */
1083 __le32 s_creator_os; /* OS */
1084 __le32 s_rev_level; /* Revision level */
1085 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1086 __le16 s_def_resgid; /* Default gid for reserved blocks */
1087 /*
1088 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1089 *
1090 * Note: the difference between the compatible feature set and
1091 * the incompatible feature set is that if there is a bit set
1092 * in the incompatible feature set that the kernel doesn't
1093 * know about, it should refuse to mount the filesystem.
1094 *
1095 * e2fsck's requirements are more strict; if it doesn't know
1096 * about a feature in either the compatible or incompatible
1097 * feature set, it must abort and not try to meddle with
1098 * things it doesn't understand...
1099 */
1100 __le32 s_first_ino; /* First non-reserved inode */
1101 __le16 s_inode_size; /* size of inode structure */
1102 __le16 s_block_group_nr; /* block group # of this superblock */
1103 __le32 s_feature_compat; /* compatible feature set */
1104 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1105 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1106 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1107 /*78*/ char s_volume_name[16]; /* volume name */
1108 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1109 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1110 /*
1111 * Performance hints. Directory preallocation should only
1112 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1113 */
1114 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1115 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1116 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1117 /*
1118 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1119 */
1120 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1121 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1122 __le32 s_journal_dev; /* device number of journal file */
1123 __le32 s_last_orphan; /* start of list of inodes to delete */
1124 __le32 s_hash_seed[4]; /* HTREE hash seed */
1125 __u8 s_def_hash_version; /* Default hash version to use */
1126 __u8 s_jnl_backup_type;
1127 __le16 s_desc_size; /* size of group descriptor */
1128 /*100*/ __le32 s_default_mount_opts;
1129 __le32 s_first_meta_bg; /* First metablock block group */
1130 __le32 s_mkfs_time; /* When the filesystem was created */
1131 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1132 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1133 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1134 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1135 __le32 s_free_blocks_count_hi; /* Free blocks count */
1136 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1137 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1138 __le32 s_flags; /* Miscellaneous flags */
1139 __le16 s_raid_stride; /* RAID stride */
1140 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1141 __le64 s_mmp_block; /* Block for multi-mount protection */
1142 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1143 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1144 __u8 s_checksum_type; /* metadata checksum algorithm used */
1145 __le16 s_reserved_pad;
1146 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1147 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1148 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1149 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1150 snapshot's future use */
1151 __le32 s_snapshot_list; /* inode number of the head of the
1152 on-disk snapshot list */
1153 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1154 __le32 s_error_count; /* number of fs errors */
1155 __le32 s_first_error_time; /* first time an error happened */
1156 __le32 s_first_error_ino; /* inode involved in first error */
1157 __le64 s_first_error_block; /* block involved of first error */
1158 __u8 s_first_error_func[32]; /* function where the error happened */
1159 __le32 s_first_error_line; /* line number where error happened */
1160 __le32 s_last_error_time; /* most recent time of an error */
1161 __le32 s_last_error_ino; /* inode involved in last error */
1162 __le32 s_last_error_line; /* line number where error happened */
1163 __le64 s_last_error_block; /* block involved of last error */
1164 __u8 s_last_error_func[32]; /* function where the error happened */
1165 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1166 __u8 s_mount_opts[64];
1167 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1168 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1169 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1170 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1171 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1172 __le32 s_reserved[105]; /* Padding to the end of the block */
1173 __le32 s_checksum; /* crc32c(superblock) */
1174 };
1175
1176 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1177
1178 #ifdef __KERNEL__
1179
1180 /*
1181 * run-time mount flags
1182 */
1183 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1184 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1185
1186 /* Number of quota types we support */
1187 #define EXT4_MAXQUOTAS 2
1188
1189 /*
1190 * fourth extended-fs super-block data in memory
1191 */
1192 struct ext4_sb_info {
1193 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1194 unsigned long s_inodes_per_block;/* Number of inodes per block */
1195 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1196 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1197 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1198 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1199 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1200 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1201 ext4_group_t s_groups_count; /* Number of groups in the fs */
1202 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1203 unsigned long s_overhead; /* # of fs overhead clusters */
1204 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1205 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1206 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1207 struct buffer_head * s_sbh; /* Buffer containing the super block */
1208 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1209 struct buffer_head **s_group_desc;
1210 unsigned int s_mount_opt;
1211 unsigned int s_mount_opt2;
1212 unsigned int s_mount_flags;
1213 unsigned int s_def_mount_opt;
1214 ext4_fsblk_t s_sb_block;
1215 atomic64_t s_resv_clusters;
1216 kuid_t s_resuid;
1217 kgid_t s_resgid;
1218 unsigned short s_mount_state;
1219 unsigned short s_pad;
1220 int s_addr_per_block_bits;
1221 int s_desc_per_block_bits;
1222 int s_inode_size;
1223 int s_first_ino;
1224 unsigned int s_inode_readahead_blks;
1225 unsigned int s_inode_goal;
1226 spinlock_t s_next_gen_lock;
1227 u32 s_next_generation;
1228 u32 s_hash_seed[4];
1229 int s_def_hash_version;
1230 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1231 struct percpu_counter s_freeclusters_counter;
1232 struct percpu_counter s_freeinodes_counter;
1233 struct percpu_counter s_dirs_counter;
1234 struct percpu_counter s_dirtyclusters_counter;
1235 struct blockgroup_lock *s_blockgroup_lock;
1236 struct proc_dir_entry *s_proc;
1237 struct kobject s_kobj;
1238 struct completion s_kobj_unregister;
1239 struct super_block *s_sb;
1240
1241 /* Journaling */
1242 struct journal_s *s_journal;
1243 struct list_head s_orphan;
1244 struct mutex s_orphan_lock;
1245 unsigned long s_resize_flags; /* Flags indicating if there
1246 is a resizer */
1247 unsigned long s_commit_interval;
1248 u32 s_max_batch_time;
1249 u32 s_min_batch_time;
1250 struct block_device *journal_bdev;
1251 #ifdef CONFIG_QUOTA
1252 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
1253 int s_jquota_fmt; /* Format of quota to use */
1254 #endif
1255 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1256 struct rb_root system_blks;
1257
1258 #ifdef EXTENTS_STATS
1259 /* ext4 extents stats */
1260 unsigned long s_ext_min;
1261 unsigned long s_ext_max;
1262 unsigned long s_depth_max;
1263 spinlock_t s_ext_stats_lock;
1264 unsigned long s_ext_blocks;
1265 unsigned long s_ext_extents;
1266 #endif
1267
1268 /* for buddy allocator */
1269 struct ext4_group_info ***s_group_info;
1270 struct inode *s_buddy_cache;
1271 spinlock_t s_md_lock;
1272 unsigned short *s_mb_offsets;
1273 unsigned int *s_mb_maxs;
1274 unsigned int s_group_info_size;
1275
1276 /* tunables */
1277 unsigned long s_stripe;
1278 unsigned int s_mb_stream_request;
1279 unsigned int s_mb_max_to_scan;
1280 unsigned int s_mb_min_to_scan;
1281 unsigned int s_mb_stats;
1282 unsigned int s_mb_order2_reqs;
1283 unsigned int s_mb_group_prealloc;
1284 unsigned int s_max_dir_size_kb;
1285 /* where last allocation was done - for stream allocation */
1286 unsigned long s_mb_last_group;
1287 unsigned long s_mb_last_start;
1288
1289 /* stats for buddy allocator */
1290 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1291 atomic_t s_bal_success; /* we found long enough chunks */
1292 atomic_t s_bal_allocated; /* in blocks */
1293 atomic_t s_bal_ex_scanned; /* total extents scanned */
1294 atomic_t s_bal_goals; /* goal hits */
1295 atomic_t s_bal_breaks; /* too long searches */
1296 atomic_t s_bal_2orders; /* 2^order hits */
1297 spinlock_t s_bal_lock;
1298 unsigned long s_mb_buddies_generated;
1299 unsigned long long s_mb_generation_time;
1300 atomic_t s_mb_lost_chunks;
1301 atomic_t s_mb_preallocated;
1302 atomic_t s_mb_discarded;
1303 atomic_t s_lock_busy;
1304
1305 /* locality groups */
1306 struct ext4_locality_group __percpu *s_locality_groups;
1307
1308 /* for write statistics */
1309 unsigned long s_sectors_written_start;
1310 u64 s_kbytes_written;
1311
1312 /* the size of zero-out chunk */
1313 unsigned int s_extent_max_zeroout_kb;
1314
1315 unsigned int s_log_groups_per_flex;
1316 struct flex_groups *s_flex_groups;
1317 ext4_group_t s_flex_groups_allocated;
1318
1319 /* workqueue for reserved extent conversions (buffered io) */
1320 struct workqueue_struct *rsv_conversion_wq;
1321
1322 /* timer for periodic error stats printing */
1323 struct timer_list s_err_report;
1324
1325 /* Lazy inode table initialization info */
1326 struct ext4_li_request *s_li_request;
1327 /* Wait multiplier for lazy initialization thread */
1328 unsigned int s_li_wait_mult;
1329
1330 /* Kernel thread for multiple mount protection */
1331 struct task_struct *s_mmp_tsk;
1332
1333 /* record the last minlen when FITRIM is called. */
1334 atomic_t s_last_trim_minblks;
1335
1336 /* Reference to checksum algorithm driver via cryptoapi */
1337 struct crypto_shash *s_chksum_driver;
1338
1339 /* Precomputed FS UUID checksum for seeding other checksums */
1340 __u32 s_csum_seed;
1341
1342 /* Reclaim extents from extent status tree */
1343 struct shrinker s_es_shrinker;
1344 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1345 long s_es_nr_inode;
1346 struct ext4_es_stats s_es_stats;
1347 struct mb_cache *s_mb_cache;
1348 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1349
1350 /* Ratelimit ext4 messages. */
1351 struct ratelimit_state s_err_ratelimit_state;
1352 struct ratelimit_state s_warning_ratelimit_state;
1353 struct ratelimit_state s_msg_ratelimit_state;
1354 };
1355
1356 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1357 {
1358 return sb->s_fs_info;
1359 }
1360 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1361 {
1362 return container_of(inode, struct ext4_inode_info, vfs_inode);
1363 }
1364
1365 static inline struct timespec ext4_current_time(struct inode *inode)
1366 {
1367 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1368 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1369 }
1370
1371 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1372 {
1373 return ino == EXT4_ROOT_INO ||
1374 ino == EXT4_USR_QUOTA_INO ||
1375 ino == EXT4_GRP_QUOTA_INO ||
1376 ino == EXT4_BOOT_LOADER_INO ||
1377 ino == EXT4_JOURNAL_INO ||
1378 ino == EXT4_RESIZE_INO ||
1379 (ino >= EXT4_FIRST_INO(sb) &&
1380 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1381 }
1382
1383 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1384 struct ext4_io_end *io_end)
1385 {
1386 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1387 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1388 atomic_inc(&EXT4_I(inode)->i_unwritten);
1389 }
1390 }
1391
1392 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1393 {
1394 return inode->i_private;
1395 }
1396
1397 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1398 {
1399 inode->i_private = io;
1400 }
1401
1402 /*
1403 * Inode dynamic state flags
1404 */
1405 enum {
1406 EXT4_STATE_JDATA, /* journaled data exists */
1407 EXT4_STATE_NEW, /* inode is newly created */
1408 EXT4_STATE_XATTR, /* has in-inode xattrs */
1409 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1410 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1411 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1412 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1413 EXT4_STATE_NEWENTRY, /* File just added to dir */
1414 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1415 nolocking */
1416 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1417 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1418 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1419 };
1420
1421 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1422 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1423 { \
1424 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1425 } \
1426 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1427 { \
1428 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1429 } \
1430 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1431 { \
1432 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1433 }
1434
1435 /* Add these declarations here only so that these functions can be
1436 * found by name. Otherwise, they are very hard to locate. */
1437 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1438 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1439 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1440 EXT4_INODE_BIT_FNS(flag, flags, 0)
1441
1442 /* Add these declarations here only so that these functions can be
1443 * found by name. Otherwise, they are very hard to locate. */
1444 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1445 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1446 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1447 #if (BITS_PER_LONG < 64)
1448 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1449
1450 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1451 {
1452 (ei)->i_state_flags = 0;
1453 }
1454 #else
1455 EXT4_INODE_BIT_FNS(state, flags, 32)
1456
1457 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1458 {
1459 /* We depend on the fact that callers will set i_flags */
1460 }
1461 #endif
1462 #else
1463 /* Assume that user mode programs are passing in an ext4fs superblock, not
1464 * a kernel struct super_block. This will allow us to call the feature-test
1465 * macros from user land. */
1466 #define EXT4_SB(sb) (sb)
1467 #endif
1468
1469 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1470
1471 /*
1472 * Codes for operating systems
1473 */
1474 #define EXT4_OS_LINUX 0
1475 #define EXT4_OS_HURD 1
1476 #define EXT4_OS_MASIX 2
1477 #define EXT4_OS_FREEBSD 3
1478 #define EXT4_OS_LITES 4
1479
1480 /*
1481 * Revision levels
1482 */
1483 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1484 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1485
1486 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1487 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1488
1489 #define EXT4_GOOD_OLD_INODE_SIZE 128
1490
1491 /*
1492 * Feature set definitions
1493 */
1494
1495 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1496 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1497 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1498 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1499 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1500 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1501 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1502 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1503 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1504 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1505 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1506 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1507 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1508 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1509 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1510 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1511 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1512 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1513
1514 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1515 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1516 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1517 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1518 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1519 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1520 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1521
1522 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1523 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1524 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1525 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1526 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1527 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1528 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1529 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1530 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1531 /*
1532 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1533 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1534 * all other data structures' checksums. However, the METADATA_CSUM and
1535 * GDT_CSUM bits are mutually exclusive.
1536 */
1537 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1538 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1539
1540 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1541 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1542 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1543 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1544 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1545 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1546 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1547 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1548 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1549 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1550 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1551 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1552 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1553 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1554 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1555
1556 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1557 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1558 EXT4_FEATURE_INCOMPAT_META_BG)
1559 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1560 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1561 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1562
1563 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1564 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1565 EXT4_FEATURE_INCOMPAT_RECOVER| \
1566 EXT4_FEATURE_INCOMPAT_META_BG)
1567 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1568 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1569 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1570
1571 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1572 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1573 EXT4_FEATURE_INCOMPAT_RECOVER| \
1574 EXT4_FEATURE_INCOMPAT_META_BG| \
1575 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1576 EXT4_FEATURE_INCOMPAT_64BIT| \
1577 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1578 EXT4_FEATURE_INCOMPAT_MMP | \
1579 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1580 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1581 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1582 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1583 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1584 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1585 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1586 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1587 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1588 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1589 EXT4_FEATURE_RO_COMPAT_QUOTA)
1590
1591 /*
1592 * Default values for user and/or group using reserved blocks
1593 */
1594 #define EXT4_DEF_RESUID 0
1595 #define EXT4_DEF_RESGID 0
1596
1597 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1598
1599 /*
1600 * Default mount options
1601 */
1602 #define EXT4_DEFM_DEBUG 0x0001
1603 #define EXT4_DEFM_BSDGROUPS 0x0002
1604 #define EXT4_DEFM_XATTR_USER 0x0004
1605 #define EXT4_DEFM_ACL 0x0008
1606 #define EXT4_DEFM_UID16 0x0010
1607 #define EXT4_DEFM_JMODE 0x0060
1608 #define EXT4_DEFM_JMODE_DATA 0x0020
1609 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1610 #define EXT4_DEFM_JMODE_WBACK 0x0060
1611 #define EXT4_DEFM_NOBARRIER 0x0100
1612 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1613 #define EXT4_DEFM_DISCARD 0x0400
1614 #define EXT4_DEFM_NODELALLOC 0x0800
1615
1616 /*
1617 * Default journal batch times
1618 */
1619 #define EXT4_DEF_MIN_BATCH_TIME 0
1620 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1621
1622 /*
1623 * Minimum number of groups in a flexgroup before we separate out
1624 * directories into the first block group of a flexgroup
1625 */
1626 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1627
1628 /*
1629 * Structure of a directory entry
1630 */
1631 #define EXT4_NAME_LEN 255
1632
1633 struct ext4_dir_entry {
1634 __le32 inode; /* Inode number */
1635 __le16 rec_len; /* Directory entry length */
1636 __le16 name_len; /* Name length */
1637 char name[EXT4_NAME_LEN]; /* File name */
1638 };
1639
1640 /*
1641 * The new version of the directory entry. Since EXT4 structures are
1642 * stored in intel byte order, and the name_len field could never be
1643 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1644 * file_type field.
1645 */
1646 struct ext4_dir_entry_2 {
1647 __le32 inode; /* Inode number */
1648 __le16 rec_len; /* Directory entry length */
1649 __u8 name_len; /* Name length */
1650 __u8 file_type;
1651 char name[EXT4_NAME_LEN]; /* File name */
1652 };
1653
1654 /*
1655 * This is a bogus directory entry at the end of each leaf block that
1656 * records checksums.
1657 */
1658 struct ext4_dir_entry_tail {
1659 __le32 det_reserved_zero1; /* Pretend to be unused */
1660 __le16 det_rec_len; /* 12 */
1661 __u8 det_reserved_zero2; /* Zero name length */
1662 __u8 det_reserved_ft; /* 0xDE, fake file type */
1663 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1664 };
1665
1666 #define EXT4_DIRENT_TAIL(block, blocksize) \
1667 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1668 ((blocksize) - \
1669 sizeof(struct ext4_dir_entry_tail))))
1670
1671 /*
1672 * Ext4 directory file types. Only the low 3 bits are used. The
1673 * other bits are reserved for now.
1674 */
1675 #define EXT4_FT_UNKNOWN 0
1676 #define EXT4_FT_REG_FILE 1
1677 #define EXT4_FT_DIR 2
1678 #define EXT4_FT_CHRDEV 3
1679 #define EXT4_FT_BLKDEV 4
1680 #define EXT4_FT_FIFO 5
1681 #define EXT4_FT_SOCK 6
1682 #define EXT4_FT_SYMLINK 7
1683
1684 #define EXT4_FT_MAX 8
1685
1686 #define EXT4_FT_DIR_CSUM 0xDE
1687
1688 /*
1689 * EXT4_DIR_PAD defines the directory entries boundaries
1690 *
1691 * NOTE: It must be a multiple of 4
1692 */
1693 #define EXT4_DIR_PAD 4
1694 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1695 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1696 ~EXT4_DIR_ROUND)
1697 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1698
1699 /*
1700 * If we ever get support for fs block sizes > page_size, we'll need
1701 * to remove the #if statements in the next two functions...
1702 */
1703 static inline unsigned int
1704 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1705 {
1706 unsigned len = le16_to_cpu(dlen);
1707
1708 #if (PAGE_CACHE_SIZE >= 65536)
1709 if (len == EXT4_MAX_REC_LEN || len == 0)
1710 return blocksize;
1711 return (len & 65532) | ((len & 3) << 16);
1712 #else
1713 return len;
1714 #endif
1715 }
1716
1717 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1718 {
1719 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1720 BUG();
1721 #if (PAGE_CACHE_SIZE >= 65536)
1722 if (len < 65536)
1723 return cpu_to_le16(len);
1724 if (len == blocksize) {
1725 if (blocksize == 65536)
1726 return cpu_to_le16(EXT4_MAX_REC_LEN);
1727 else
1728 return cpu_to_le16(0);
1729 }
1730 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1731 #else
1732 return cpu_to_le16(len);
1733 #endif
1734 }
1735
1736 /*
1737 * Hash Tree Directory indexing
1738 * (c) Daniel Phillips, 2001
1739 */
1740
1741 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1742 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1743 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1744 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1745 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1746
1747 /* Legal values for the dx_root hash_version field: */
1748
1749 #define DX_HASH_LEGACY 0
1750 #define DX_HASH_HALF_MD4 1
1751 #define DX_HASH_TEA 2
1752 #define DX_HASH_LEGACY_UNSIGNED 3
1753 #define DX_HASH_HALF_MD4_UNSIGNED 4
1754 #define DX_HASH_TEA_UNSIGNED 5
1755
1756 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1757 const void *address, unsigned int length)
1758 {
1759 struct {
1760 struct shash_desc shash;
1761 char ctx[4];
1762 } desc;
1763 int err;
1764
1765 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1766
1767 desc.shash.tfm = sbi->s_chksum_driver;
1768 desc.shash.flags = 0;
1769 *(u32 *)desc.ctx = crc;
1770
1771 err = crypto_shash_update(&desc.shash, address, length);
1772 BUG_ON(err);
1773
1774 return *(u32 *)desc.ctx;
1775 }
1776
1777 #ifdef __KERNEL__
1778
1779 /* hash info structure used by the directory hash */
1780 struct dx_hash_info
1781 {
1782 u32 hash;
1783 u32 minor_hash;
1784 int hash_version;
1785 u32 *seed;
1786 };
1787
1788
1789 /* 32 and 64 bit signed EOF for dx directories */
1790 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1791 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1792
1793
1794 /*
1795 * Control parameters used by ext4_htree_next_block
1796 */
1797 #define HASH_NB_ALWAYS 1
1798
1799
1800 /*
1801 * Describe an inode's exact location on disk and in memory
1802 */
1803 struct ext4_iloc
1804 {
1805 struct buffer_head *bh;
1806 unsigned long offset;
1807 ext4_group_t block_group;
1808 };
1809
1810 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1811 {
1812 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1813 }
1814
1815 /*
1816 * This structure is stuffed into the struct file's private_data field
1817 * for directories. It is where we put information so that we can do
1818 * readdir operations in hash tree order.
1819 */
1820 struct dir_private_info {
1821 struct rb_root root;
1822 struct rb_node *curr_node;
1823 struct fname *extra_fname;
1824 loff_t last_pos;
1825 __u32 curr_hash;
1826 __u32 curr_minor_hash;
1827 __u32 next_hash;
1828 };
1829
1830 /* calculate the first block number of the group */
1831 static inline ext4_fsblk_t
1832 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1833 {
1834 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1835 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1836 }
1837
1838 /*
1839 * Special error return code only used by dx_probe() and its callers.
1840 */
1841 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
1842
1843 /*
1844 * Timeout and state flag for lazy initialization inode thread.
1845 */
1846 #define EXT4_DEF_LI_WAIT_MULT 10
1847 #define EXT4_DEF_LI_MAX_START_DELAY 5
1848 #define EXT4_LAZYINIT_QUIT 0x0001
1849 #define EXT4_LAZYINIT_RUNNING 0x0002
1850
1851 /*
1852 * Lazy inode table initialization info
1853 */
1854 struct ext4_lazy_init {
1855 unsigned long li_state;
1856 struct list_head li_request_list;
1857 struct mutex li_list_mtx;
1858 };
1859
1860 struct ext4_li_request {
1861 struct super_block *lr_super;
1862 struct ext4_sb_info *lr_sbi;
1863 ext4_group_t lr_next_group;
1864 struct list_head lr_request;
1865 unsigned long lr_next_sched;
1866 unsigned long lr_timeout;
1867 };
1868
1869 struct ext4_features {
1870 struct kobject f_kobj;
1871 struct completion f_kobj_unregister;
1872 };
1873
1874 /*
1875 * This structure will be used for multiple mount protection. It will be
1876 * written into the block number saved in the s_mmp_block field in the
1877 * superblock. Programs that check MMP should assume that if
1878 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1879 * to use the filesystem, regardless of how old the timestamp is.
1880 */
1881 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1882 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1883 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1884 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1885
1886 struct mmp_struct {
1887 __le32 mmp_magic; /* Magic number for MMP */
1888 __le32 mmp_seq; /* Sequence no. updated periodically */
1889
1890 /*
1891 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1892 * purposes and do not affect the correctness of the algorithm
1893 */
1894 __le64 mmp_time; /* Time last updated */
1895 char mmp_nodename[64]; /* Node which last updated MMP block */
1896 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1897
1898 /*
1899 * mmp_check_interval is used to verify if the MMP block has been
1900 * updated on the block device. The value is updated based on the
1901 * maximum time to write the MMP block during an update cycle.
1902 */
1903 __le16 mmp_check_interval;
1904
1905 __le16 mmp_pad1;
1906 __le32 mmp_pad2[226];
1907 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1908 };
1909
1910 /* arguments passed to the mmp thread */
1911 struct mmpd_data {
1912 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1913 struct super_block *sb; /* super block of the fs */
1914 };
1915
1916 /*
1917 * Check interval multiplier
1918 * The MMP block is written every update interval and initially checked every
1919 * update interval x the multiplier (the value is then adapted based on the
1920 * write latency). The reason is that writes can be delayed under load and we
1921 * don't want readers to incorrectly assume that the filesystem is no longer
1922 * in use.
1923 */
1924 #define EXT4_MMP_CHECK_MULT 2UL
1925
1926 /*
1927 * Minimum interval for MMP checking in seconds.
1928 */
1929 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1930
1931 /*
1932 * Maximum interval for MMP checking in seconds.
1933 */
1934 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1935
1936 /*
1937 * Function prototypes
1938 */
1939
1940 /*
1941 * Ok, these declarations are also in <linux/kernel.h> but none of the
1942 * ext4 source programs needs to include it so they are duplicated here.
1943 */
1944 # define NORET_TYPE /**/
1945 # define ATTRIB_NORET __attribute__((noreturn))
1946 # define NORET_AND noreturn,
1947
1948 /* bitmap.c */
1949 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1950 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1951 struct ext4_group_desc *gdp,
1952 struct buffer_head *bh, int sz);
1953 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1954 struct ext4_group_desc *gdp,
1955 struct buffer_head *bh, int sz);
1956 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1957 struct ext4_group_desc *gdp,
1958 struct buffer_head *bh);
1959 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1960 struct ext4_group_desc *gdp,
1961 struct buffer_head *bh);
1962
1963 /* balloc.c */
1964 extern void ext4_get_group_no_and_offset(struct super_block *sb,
1965 ext4_fsblk_t blocknr,
1966 ext4_group_t *blockgrpp,
1967 ext4_grpblk_t *offsetp);
1968 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1969 ext4_fsblk_t block);
1970
1971 extern unsigned int ext4_block_group(struct super_block *sb,
1972 ext4_fsblk_t blocknr);
1973 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1974 ext4_fsblk_t blocknr);
1975 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1976 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1977 ext4_group_t group);
1978 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1979 ext4_fsblk_t goal,
1980 unsigned int flags,
1981 unsigned long *count,
1982 int *errp);
1983 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1984 s64 nclusters, unsigned int flags);
1985 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1986 extern void ext4_check_blocks_bitmap(struct super_block *);
1987 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1988 ext4_group_t block_group,
1989 struct buffer_head ** bh);
1990 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1991
1992 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1993 ext4_group_t block_group);
1994 extern int ext4_wait_block_bitmap(struct super_block *sb,
1995 ext4_group_t block_group,
1996 struct buffer_head *bh);
1997 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1998 ext4_group_t block_group);
1999 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2000 ext4_group_t block_group,
2001 struct ext4_group_desc *gdp);
2002 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2003
2004 /* dir.c */
2005 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2006 struct file *,
2007 struct ext4_dir_entry_2 *,
2008 struct buffer_head *, char *, int,
2009 unsigned int);
2010 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2011 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2012 (de), (bh), (buf), (size), (offset)))
2013 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2014 __u32 minor_hash,
2015 struct ext4_dir_entry_2 *dirent);
2016 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2017 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2018 struct buffer_head *bh,
2019 void *buf, int buf_size,
2020 const char *name, int namelen,
2021 struct ext4_dir_entry_2 **dest_de);
2022 void ext4_insert_dentry(struct inode *inode,
2023 struct ext4_dir_entry_2 *de,
2024 int buf_size,
2025 const char *name, int namelen);
2026 static inline void ext4_update_dx_flag(struct inode *inode)
2027 {
2028 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2029 EXT4_FEATURE_COMPAT_DIR_INDEX))
2030 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2031 }
2032 static unsigned char ext4_filetype_table[] = {
2033 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2034 };
2035
2036 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2037 {
2038 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2039 (filetype >= EXT4_FT_MAX))
2040 return DT_UNKNOWN;
2041
2042 return ext4_filetype_table[filetype];
2043 }
2044 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2045 void *buf, int buf_size);
2046
2047 /* fsync.c */
2048 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2049
2050 /* hash.c */
2051 extern int ext4fs_dirhash(const char *name, int len, struct
2052 dx_hash_info *hinfo);
2053
2054 /* ialloc.c */
2055 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2056 const struct qstr *qstr, __u32 goal,
2057 uid_t *owner, int handle_type,
2058 unsigned int line_no, int nblocks);
2059
2060 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2061 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2062 0, 0, 0)
2063 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2064 type, nblocks) \
2065 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2066 (type), __LINE__, (nblocks))
2067
2068
2069 extern void ext4_free_inode(handle_t *, struct inode *);
2070 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2071 extern unsigned long ext4_count_free_inodes(struct super_block *);
2072 extern unsigned long ext4_count_dirs(struct super_block *);
2073 extern void ext4_check_inodes_bitmap(struct super_block *);
2074 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2075 extern int ext4_init_inode_table(struct super_block *sb,
2076 ext4_group_t group, int barrier);
2077 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2078
2079 /* mballoc.c */
2080 extern long ext4_mb_stats;
2081 extern long ext4_mb_max_to_scan;
2082 extern int ext4_mb_init(struct super_block *);
2083 extern int ext4_mb_release(struct super_block *);
2084 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2085 struct ext4_allocation_request *, int *);
2086 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2087 extern void ext4_discard_preallocations(struct inode *);
2088 extern int __init ext4_init_mballoc(void);
2089 extern void ext4_exit_mballoc(void);
2090 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2091 struct buffer_head *bh, ext4_fsblk_t block,
2092 unsigned long count, int flags);
2093 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2094 ext4_group_t ngroups);
2095 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2096 ext4_group_t i, struct ext4_group_desc *desc);
2097 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2098 ext4_fsblk_t block, unsigned long count);
2099 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2100
2101 /* inode.c */
2102 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2103 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2104 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2105 struct buffer_head *bh_result, int create);
2106 int ext4_get_block(struct inode *inode, sector_t iblock,
2107 struct buffer_head *bh_result, int create);
2108 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2109 struct buffer_head *bh, int create);
2110 int ext4_walk_page_buffers(handle_t *handle,
2111 struct buffer_head *head,
2112 unsigned from,
2113 unsigned to,
2114 int *partial,
2115 int (*fn)(handle_t *handle,
2116 struct buffer_head *bh));
2117 int do_journal_get_write_access(handle_t *handle,
2118 struct buffer_head *bh);
2119 #define FALL_BACK_TO_NONDELALLOC 1
2120 #define CONVERT_INLINE_DATA 2
2121
2122 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2123 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2124 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2125 extern int ext4_setattr(struct dentry *, struct iattr *);
2126 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2127 struct kstat *stat);
2128 extern void ext4_evict_inode(struct inode *);
2129 extern void ext4_clear_inode(struct inode *);
2130 extern int ext4_sync_inode(handle_t *, struct inode *);
2131 extern void ext4_dirty_inode(struct inode *, int);
2132 extern int ext4_change_inode_journal_flag(struct inode *, int);
2133 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2134 extern int ext4_inode_attach_jinode(struct inode *inode);
2135 extern int ext4_can_truncate(struct inode *inode);
2136 extern void ext4_truncate(struct inode *);
2137 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2138 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2139 extern void ext4_set_inode_flags(struct inode *);
2140 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2141 extern int ext4_alloc_da_blocks(struct inode *inode);
2142 extern void ext4_set_aops(struct inode *inode);
2143 extern int ext4_writepage_trans_blocks(struct inode *);
2144 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2145 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2146 loff_t lstart, loff_t lend);
2147 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2148 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2149 extern void ext4_da_update_reserve_space(struct inode *inode,
2150 int used, int quota_claim);
2151
2152 /* indirect.c */
2153 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2154 struct ext4_map_blocks *map, int flags);
2155 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2156 struct iov_iter *iter, loff_t offset);
2157 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2158 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2159 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2160 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2161 ext4_lblk_t start, ext4_lblk_t end);
2162
2163 /* ioctl.c */
2164 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2165 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2166
2167 /* migrate.c */
2168 extern int ext4_ext_migrate(struct inode *);
2169 extern int ext4_ind_migrate(struct inode *inode);
2170
2171 /* namei.c */
2172 extern int ext4_dirent_csum_verify(struct inode *inode,
2173 struct ext4_dir_entry *dirent);
2174 extern int ext4_orphan_add(handle_t *, struct inode *);
2175 extern int ext4_orphan_del(handle_t *, struct inode *);
2176 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2177 __u32 start_minor_hash, __u32 *next_hash);
2178 extern int search_dir(struct buffer_head *bh,
2179 char *search_buf,
2180 int buf_size,
2181 struct inode *dir,
2182 const struct qstr *d_name,
2183 unsigned int offset,
2184 struct ext4_dir_entry_2 **res_dir);
2185 extern int ext4_generic_delete_entry(handle_t *handle,
2186 struct inode *dir,
2187 struct ext4_dir_entry_2 *de_del,
2188 struct buffer_head *bh,
2189 void *entry_buf,
2190 int buf_size,
2191 int csum_size);
2192
2193 /* resize.c */
2194 extern int ext4_group_add(struct super_block *sb,
2195 struct ext4_new_group_data *input);
2196 extern int ext4_group_extend(struct super_block *sb,
2197 struct ext4_super_block *es,
2198 ext4_fsblk_t n_blocks_count);
2199 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2200
2201 /* super.c */
2202 extern int ext4_calculate_overhead(struct super_block *sb);
2203 extern void ext4_superblock_csum_set(struct super_block *sb);
2204 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2205 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2206 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2207 ext4_group_t ngroup);
2208 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2209 char nbuf[16]);
2210
2211 extern __printf(4, 5)
2212 void __ext4_error(struct super_block *, const char *, unsigned int,
2213 const char *, ...);
2214 extern __printf(5, 6)
2215 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2216 const char *, ...);
2217 extern __printf(5, 6)
2218 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2219 const char *, ...);
2220 extern void __ext4_std_error(struct super_block *, const char *,
2221 unsigned int, int);
2222 extern __printf(4, 5)
2223 void __ext4_abort(struct super_block *, const char *, unsigned int,
2224 const char *, ...);
2225 extern __printf(4, 5)
2226 void __ext4_warning(struct super_block *, const char *, unsigned int,
2227 const char *, ...);
2228 extern __printf(3, 4)
2229 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2230 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2231 const char *, unsigned int, const char *);
2232 extern __printf(7, 8)
2233 void __ext4_grp_locked_error(const char *, unsigned int,
2234 struct super_block *, ext4_group_t,
2235 unsigned long, ext4_fsblk_t,
2236 const char *, ...);
2237
2238 #ifdef CONFIG_PRINTK
2239
2240 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2241 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2242 #define ext4_error_file(file, func, line, block, fmt, ...) \
2243 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2244 #define ext4_error(sb, fmt, ...) \
2245 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2246 #define ext4_abort(sb, fmt, ...) \
2247 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2248 #define ext4_warning(sb, fmt, ...) \
2249 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2250 #define ext4_msg(sb, level, fmt, ...) \
2251 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2252 #define dump_mmp_msg(sb, mmp, msg) \
2253 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2254 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2255 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2256 fmt, ##__VA_ARGS__)
2257
2258 #else
2259
2260 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2261 do { \
2262 no_printk(fmt, ##__VA_ARGS__); \
2263 __ext4_error_inode(inode, "", 0, block, " "); \
2264 } while (0)
2265 #define ext4_error_file(file, func, line, block, fmt, ...) \
2266 do { \
2267 no_printk(fmt, ##__VA_ARGS__); \
2268 __ext4_error_file(file, "", 0, block, " "); \
2269 } while (0)
2270 #define ext4_error(sb, fmt, ...) \
2271 do { \
2272 no_printk(fmt, ##__VA_ARGS__); \
2273 __ext4_error(sb, "", 0, " "); \
2274 } while (0)
2275 #define ext4_abort(sb, fmt, ...) \
2276 do { \
2277 no_printk(fmt, ##__VA_ARGS__); \
2278 __ext4_abort(sb, "", 0, " "); \
2279 } while (0)
2280 #define ext4_warning(sb, fmt, ...) \
2281 do { \
2282 no_printk(fmt, ##__VA_ARGS__); \
2283 __ext4_warning(sb, "", 0, " "); \
2284 } while (0)
2285 #define ext4_msg(sb, level, fmt, ...) \
2286 do { \
2287 no_printk(fmt, ##__VA_ARGS__); \
2288 __ext4_msg(sb, "", " "); \
2289 } while (0)
2290 #define dump_mmp_msg(sb, mmp, msg) \
2291 __dump_mmp_msg(sb, mmp, "", 0, "")
2292 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2293 do { \
2294 no_printk(fmt, ##__VA_ARGS__); \
2295 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2296 } while (0)
2297
2298 #endif
2299
2300 extern void ext4_update_dynamic_rev(struct super_block *sb);
2301 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2302 __u32 compat);
2303 extern int ext4_update_rocompat_feature(handle_t *handle,
2304 struct super_block *sb, __u32 rocompat);
2305 extern int ext4_update_incompat_feature(handle_t *handle,
2306 struct super_block *sb, __u32 incompat);
2307 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2308 struct ext4_group_desc *bg);
2309 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2310 struct ext4_group_desc *bg);
2311 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2312 struct ext4_group_desc *bg);
2313 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2314 struct ext4_group_desc *bg);
2315 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2316 struct ext4_group_desc *bg);
2317 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2318 struct ext4_group_desc *bg);
2319 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2320 struct ext4_group_desc *bg);
2321 extern void ext4_block_bitmap_set(struct super_block *sb,
2322 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2323 extern void ext4_inode_bitmap_set(struct super_block *sb,
2324 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2325 extern void ext4_inode_table_set(struct super_block *sb,
2326 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2327 extern void ext4_free_group_clusters_set(struct super_block *sb,
2328 struct ext4_group_desc *bg,
2329 __u32 count);
2330 extern void ext4_free_inodes_set(struct super_block *sb,
2331 struct ext4_group_desc *bg, __u32 count);
2332 extern void ext4_used_dirs_set(struct super_block *sb,
2333 struct ext4_group_desc *bg, __u32 count);
2334 extern void ext4_itable_unused_set(struct super_block *sb,
2335 struct ext4_group_desc *bg, __u32 count);
2336 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2337 struct ext4_group_desc *gdp);
2338 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2339 struct ext4_group_desc *gdp);
2340 extern int ext4_register_li_request(struct super_block *sb,
2341 ext4_group_t first_not_zeroed);
2342
2343 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2344 {
2345 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2346 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
2347 (EXT4_SB(sb)->s_chksum_driver != NULL);
2348 }
2349
2350 static inline int ext4_has_metadata_csum(struct super_block *sb)
2351 {
2352 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
2353 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
2354 !EXT4_SB(sb)->s_chksum_driver);
2355
2356 return (EXT4_SB(sb)->s_chksum_driver != NULL);
2357 }
2358 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2359 {
2360 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2361 le32_to_cpu(es->s_blocks_count_lo);
2362 }
2363
2364 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2365 {
2366 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2367 le32_to_cpu(es->s_r_blocks_count_lo);
2368 }
2369
2370 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2371 {
2372 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2373 le32_to_cpu(es->s_free_blocks_count_lo);
2374 }
2375
2376 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2377 ext4_fsblk_t blk)
2378 {
2379 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2380 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2381 }
2382
2383 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2384 ext4_fsblk_t blk)
2385 {
2386 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2387 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2388 }
2389
2390 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2391 ext4_fsblk_t blk)
2392 {
2393 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2394 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2395 }
2396
2397 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2398 {
2399 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2400 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2401 le32_to_cpu(raw_inode->i_size_lo);
2402 else
2403 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2404 }
2405
2406 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2407 {
2408 raw_inode->i_size_lo = cpu_to_le32(i_size);
2409 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2410 }
2411
2412 static inline
2413 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2414 ext4_group_t group)
2415 {
2416 struct ext4_group_info ***grp_info;
2417 long indexv, indexh;
2418 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2419 grp_info = EXT4_SB(sb)->s_group_info;
2420 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2421 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2422 return grp_info[indexv][indexh];
2423 }
2424
2425 /*
2426 * Reading s_groups_count requires using smp_rmb() afterwards. See
2427 * the locking protocol documented in the comments of ext4_group_add()
2428 * in resize.c
2429 */
2430 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2431 {
2432 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2433
2434 smp_rmb();
2435 return ngroups;
2436 }
2437
2438 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2439 ext4_group_t block_group)
2440 {
2441 return block_group >> sbi->s_log_groups_per_flex;
2442 }
2443
2444 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2445 {
2446 return 1 << sbi->s_log_groups_per_flex;
2447 }
2448
2449 #define ext4_std_error(sb, errno) \
2450 do { \
2451 if ((errno)) \
2452 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2453 } while (0)
2454
2455 #ifdef CONFIG_SMP
2456 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2457 * counters. So we need to make sure we have free clusters more
2458 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2459 */
2460 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2461 #else
2462 #define EXT4_FREECLUSTERS_WATERMARK 0
2463 #endif
2464
2465 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2466 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2467 {
2468 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2469 !mutex_is_locked(&inode->i_mutex));
2470 down_write(&EXT4_I(inode)->i_data_sem);
2471 if (newsize > EXT4_I(inode)->i_disksize)
2472 EXT4_I(inode)->i_disksize = newsize;
2473 up_write(&EXT4_I(inode)->i_data_sem);
2474 }
2475
2476 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2477 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2478 {
2479 int changed = 0;
2480
2481 if (newsize > inode->i_size) {
2482 i_size_write(inode, newsize);
2483 changed = 1;
2484 }
2485 if (newsize > EXT4_I(inode)->i_disksize) {
2486 ext4_update_i_disksize(inode, newsize);
2487 changed |= 2;
2488 }
2489 return changed;
2490 }
2491
2492 struct ext4_group_info {
2493 unsigned long bb_state;
2494 struct rb_root bb_free_root;
2495 ext4_grpblk_t bb_first_free; /* first free block */
2496 ext4_grpblk_t bb_free; /* total free blocks */
2497 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2498 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2499 struct list_head bb_prealloc_list;
2500 #ifdef DOUBLE_CHECK
2501 void *bb_bitmap;
2502 #endif
2503 struct rw_semaphore alloc_sem;
2504 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2505 * regions, index is order.
2506 * bb_counters[3] = 5 means
2507 * 5 free 8-block regions. */
2508 };
2509
2510 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2511 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2512 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2513 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2514
2515 #define EXT4_MB_GRP_NEED_INIT(grp) \
2516 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2517 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2518 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2519 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2520 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2521
2522 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2523 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2524 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2525 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2526 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2527 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2528
2529 #define EXT4_MAX_CONTENTION 8
2530 #define EXT4_CONTENTION_THRESHOLD 2
2531
2532 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2533 ext4_group_t group)
2534 {
2535 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2536 }
2537
2538 /*
2539 * Returns true if the filesystem is busy enough that attempts to
2540 * access the block group locks has run into contention.
2541 */
2542 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2543 {
2544 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2545 }
2546
2547 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2548 {
2549 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2550 if (spin_trylock(lock))
2551 /*
2552 * We're able to grab the lock right away, so drop the
2553 * lock contention counter.
2554 */
2555 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2556 else {
2557 /*
2558 * The lock is busy, so bump the contention counter,
2559 * and then wait on the spin lock.
2560 */
2561 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2562 EXT4_MAX_CONTENTION);
2563 spin_lock(lock);
2564 }
2565 }
2566
2567 static inline void ext4_unlock_group(struct super_block *sb,
2568 ext4_group_t group)
2569 {
2570 spin_unlock(ext4_group_lock_ptr(sb, group));
2571 }
2572
2573 /*
2574 * Block validity checking
2575 */
2576 #define ext4_check_indirect_blockref(inode, bh) \
2577 ext4_check_blockref(__func__, __LINE__, inode, \
2578 (__le32 *)(bh)->b_data, \
2579 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2580
2581 #define ext4_ind_check_inode(inode) \
2582 ext4_check_blockref(__func__, __LINE__, inode, \
2583 EXT4_I(inode)->i_data, \
2584 EXT4_NDIR_BLOCKS)
2585
2586 /*
2587 * Inodes and files operations
2588 */
2589
2590 /* dir.c */
2591 extern const struct file_operations ext4_dir_operations;
2592
2593 /* file.c */
2594 extern const struct inode_operations ext4_file_inode_operations;
2595 extern const struct file_operations ext4_file_operations;
2596 extern const struct file_operations ext4_dax_file_operations;
2597 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2598
2599 /* inline.c */
2600 extern int ext4_get_max_inline_size(struct inode *inode);
2601 extern int ext4_find_inline_data_nolock(struct inode *inode);
2602 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2603 unsigned int len);
2604 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2605
2606 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2607 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2608 struct inode *inode,
2609 loff_t pos, unsigned len,
2610 unsigned flags,
2611 struct page **pagep);
2612 extern int ext4_write_inline_data_end(struct inode *inode,
2613 loff_t pos, unsigned len,
2614 unsigned copied,
2615 struct page *page);
2616 extern struct buffer_head *
2617 ext4_journalled_write_inline_data(struct inode *inode,
2618 unsigned len,
2619 struct page *page);
2620 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2621 struct inode *inode,
2622 loff_t pos, unsigned len,
2623 unsigned flags,
2624 struct page **pagep,
2625 void **fsdata);
2626 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2627 unsigned len, unsigned copied,
2628 struct page *page);
2629 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2630 struct inode *inode);
2631 extern int ext4_try_create_inline_dir(handle_t *handle,
2632 struct inode *parent,
2633 struct inode *inode);
2634 extern int ext4_read_inline_dir(struct file *filp,
2635 struct dir_context *ctx,
2636 int *has_inline_data);
2637 extern int htree_inlinedir_to_tree(struct file *dir_file,
2638 struct inode *dir, ext4_lblk_t block,
2639 struct dx_hash_info *hinfo,
2640 __u32 start_hash, __u32 start_minor_hash,
2641 int *has_inline_data);
2642 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2643 const struct qstr *d_name,
2644 struct ext4_dir_entry_2 **res_dir,
2645 int *has_inline_data);
2646 extern int ext4_delete_inline_entry(handle_t *handle,
2647 struct inode *dir,
2648 struct ext4_dir_entry_2 *de_del,
2649 struct buffer_head *bh,
2650 int *has_inline_data);
2651 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2652 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2653 struct ext4_dir_entry_2 **parent_de,
2654 int *retval);
2655 extern int ext4_inline_data_fiemap(struct inode *inode,
2656 struct fiemap_extent_info *fieinfo,
2657 int *has_inline, __u64 start, __u64 len);
2658 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2659 struct inode *inode,
2660 int needed);
2661 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2662
2663 extern int ext4_convert_inline_data(struct inode *inode);
2664
2665 static inline int ext4_has_inline_data(struct inode *inode)
2666 {
2667 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2668 EXT4_I(inode)->i_inline_off;
2669 }
2670
2671 /* namei.c */
2672 extern const struct inode_operations ext4_dir_inode_operations;
2673 extern const struct inode_operations ext4_special_inode_operations;
2674 extern struct dentry *ext4_get_parent(struct dentry *child);
2675 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2676 struct ext4_dir_entry_2 *de,
2677 int blocksize, int csum_size,
2678 unsigned int parent_ino, int dotdot_real_len);
2679 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2680 unsigned int blocksize);
2681 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2682 struct inode *inode,
2683 struct buffer_head *bh);
2684 #define S_SHIFT 12
2685 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2686 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2687 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2688 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2689 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2690 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2691 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2692 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2693 };
2694
2695 static inline void ext4_set_de_type(struct super_block *sb,
2696 struct ext4_dir_entry_2 *de,
2697 umode_t mode) {
2698 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2699 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2700 }
2701
2702
2703 /* symlink.c */
2704 extern const struct inode_operations ext4_symlink_inode_operations;
2705 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2706
2707 /* block_validity */
2708 extern void ext4_release_system_zone(struct super_block *sb);
2709 extern int ext4_setup_system_zone(struct super_block *sb);
2710 extern int __init ext4_init_system_zone(void);
2711 extern void ext4_exit_system_zone(void);
2712 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2713 ext4_fsblk_t start_blk,
2714 unsigned int count);
2715 extern int ext4_check_blockref(const char *, unsigned int,
2716 struct inode *, __le32 *, unsigned int);
2717
2718 /* extents.c */
2719 struct ext4_ext_path;
2720 struct ext4_extent;
2721
2722 /*
2723 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2724 * __le32.
2725 */
2726 #define EXT_MAX_BLOCKS 0xffffffff
2727
2728 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2729 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2730 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2731 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2732 struct ext4_map_blocks *map, int flags);
2733 extern void ext4_ext_truncate(handle_t *, struct inode *);
2734 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2735 ext4_lblk_t end);
2736 extern void ext4_ext_init(struct super_block *);
2737 extern void ext4_ext_release(struct super_block *);
2738 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2739 loff_t len);
2740 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2741 loff_t offset, ssize_t len);
2742 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2743 struct ext4_map_blocks *map, int flags);
2744 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2745 ext4_lblk_t lblocks);
2746 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2747 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2748 int num,
2749 struct ext4_ext_path *path);
2750 extern int ext4_can_extents_be_merged(struct inode *inode,
2751 struct ext4_extent *ex1,
2752 struct ext4_extent *ex2);
2753 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2754 struct ext4_ext_path **,
2755 struct ext4_extent *, int);
2756 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
2757 struct ext4_ext_path **,
2758 int flags);
2759 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2760 extern int ext4_ext_check_inode(struct inode *inode);
2761 extern int ext4_find_delalloc_range(struct inode *inode,
2762 ext4_lblk_t lblk_start,
2763 ext4_lblk_t lblk_end);
2764 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2765 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
2766 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2767 __u64 start, __u64 len);
2768 extern int ext4_ext_precache(struct inode *inode);
2769 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2770 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
2771 struct inode *inode2, ext4_lblk_t lblk1,
2772 ext4_lblk_t lblk2, ext4_lblk_t count,
2773 int mark_unwritten,int *err);
2774
2775 /* move_extent.c */
2776 extern void ext4_double_down_write_data_sem(struct inode *first,
2777 struct inode *second);
2778 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2779 struct inode *donor_inode);
2780 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2781 __u64 start_orig, __u64 start_donor,
2782 __u64 len, __u64 *moved_len);
2783
2784 /* page-io.c */
2785 extern int __init ext4_init_pageio(void);
2786 extern void ext4_exit_pageio(void);
2787 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2788 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2789 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2790 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2791 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2792 struct writeback_control *wbc);
2793 extern void ext4_end_io_rsv_work(struct work_struct *work);
2794 extern void ext4_io_submit(struct ext4_io_submit *io);
2795 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2796 struct page *page,
2797 int len,
2798 struct writeback_control *wbc,
2799 bool keep_towrite);
2800
2801 /* mmp.c */
2802 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2803
2804 /*
2805 * Add new method to test whether block and inode bitmaps are properly
2806 * initialized. With uninit_bg reading the block from disk is not enough
2807 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2808 */
2809 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2810
2811 static inline int bitmap_uptodate(struct buffer_head *bh)
2812 {
2813 return (buffer_uptodate(bh) &&
2814 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2815 }
2816 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2817 {
2818 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2819 }
2820
2821 /*
2822 * Disable DIO read nolock optimization, so new dioreaders will be forced
2823 * to grab i_mutex
2824 */
2825 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2826 {
2827 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2828 smp_mb();
2829 }
2830 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2831 {
2832 smp_mb();
2833 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2834 }
2835
2836 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2837
2838 /* For ioend & aio unwritten conversion wait queues */
2839 #define EXT4_WQ_HASH_SZ 37
2840 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2841 EXT4_WQ_HASH_SZ])
2842 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2843 EXT4_WQ_HASH_SZ])
2844 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2845 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2846
2847 #define EXT4_RESIZING 0
2848 extern int ext4_resize_begin(struct super_block *sb);
2849 extern void ext4_resize_end(struct super_block *sb);
2850
2851 #endif /* __KERNEL__ */
2852
2853 #endif /* _EXT4_H */
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