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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[deliverable/linux.git] / fs / ext4 / ext4.h
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <linux/ratelimit.h>
33 #include <crypto/hash.h>
34 #include <linux/falloc.h>
35 #ifdef __KERNEL__
36 #include <linux/compat.h>
37 #endif
38
39 /*
40 * The fourth extended filesystem constants/structures
41 */
42
43 /*
44 * Define EXT4FS_DEBUG to produce debug messages
45 */
46 #undef EXT4FS_DEBUG
47
48 /*
49 * Debug code
50 */
51 #ifdef EXT4FS_DEBUG
52 #define ext4_debug(f, a...) \
53 do { \
54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
55 __FILE__, __LINE__, __func__); \
56 printk(KERN_DEBUG f, ## a); \
57 } while (0)
58 #else
59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
60 #endif
61
62 /*
63 * Turn on EXT_DEBUG to get lots of info about extents operations.
64 */
65 #define EXT_DEBUG__
66 #ifdef EXT_DEBUG
67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
68 #else
69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
70 #endif
71
72 /* data type for block offset of block group */
73 typedef int ext4_grpblk_t;
74
75 /* data type for filesystem-wide blocks number */
76 typedef unsigned long long ext4_fsblk_t;
77
78 /* data type for file logical block number */
79 typedef __u32 ext4_lblk_t;
80
81 /* data type for block group number */
82 typedef unsigned int ext4_group_t;
83
84 enum SHIFT_DIRECTION {
85 SHIFT_LEFT = 0,
86 SHIFT_RIGHT,
87 };
88
89 /*
90 * Flags used in mballoc's allocation_context flags field.
91 *
92 * Also used to show what's going on for debugging purposes when the
93 * flag field is exported via the traceport interface
94 */
95
96 /* prefer goal again. length */
97 #define EXT4_MB_HINT_MERGE 0x0001
98 /* blocks already reserved */
99 #define EXT4_MB_HINT_RESERVED 0x0002
100 /* metadata is being allocated */
101 #define EXT4_MB_HINT_METADATA 0x0004
102 /* first blocks in the file */
103 #define EXT4_MB_HINT_FIRST 0x0008
104 /* search for the best chunk */
105 #define EXT4_MB_HINT_BEST 0x0010
106 /* data is being allocated */
107 #define EXT4_MB_HINT_DATA 0x0020
108 /* don't preallocate (for tails) */
109 #define EXT4_MB_HINT_NOPREALLOC 0x0040
110 /* allocate for locality group */
111 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
112 /* allocate goal blocks or none */
113 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
114 /* goal is meaningful */
115 #define EXT4_MB_HINT_TRY_GOAL 0x0200
116 /* blocks already pre-reserved by delayed allocation */
117 #define EXT4_MB_DELALLOC_RESERVED 0x0400
118 /* We are doing stream allocation */
119 #define EXT4_MB_STREAM_ALLOC 0x0800
120 /* Use reserved root blocks if needed */
121 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
122 /* Use blocks from reserved pool */
123 #define EXT4_MB_USE_RESERVED 0x2000
124
125 struct ext4_allocation_request {
126 /* target inode for block we're allocating */
127 struct inode *inode;
128 /* how many blocks we want to allocate */
129 unsigned int len;
130 /* logical block in target inode */
131 ext4_lblk_t logical;
132 /* the closest logical allocated block to the left */
133 ext4_lblk_t lleft;
134 /* the closest logical allocated block to the right */
135 ext4_lblk_t lright;
136 /* phys. target (a hint) */
137 ext4_fsblk_t goal;
138 /* phys. block for the closest logical allocated block to the left */
139 ext4_fsblk_t pleft;
140 /* phys. block for the closest logical allocated block to the right */
141 ext4_fsblk_t pright;
142 /* flags. see above EXT4_MB_HINT_* */
143 unsigned int flags;
144 };
145
146 /*
147 * Logical to physical block mapping, used by ext4_map_blocks()
148 *
149 * This structure is used to pass requests into ext4_map_blocks() as
150 * well as to store the information returned by ext4_map_blocks(). It
151 * takes less room on the stack than a struct buffer_head.
152 */
153 #define EXT4_MAP_NEW (1 << BH_New)
154 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
157 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
158 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
159
160 struct ext4_map_blocks {
161 ext4_fsblk_t m_pblk;
162 ext4_lblk_t m_lblk;
163 unsigned int m_len;
164 unsigned int m_flags;
165 };
166
167 /*
168 * Flags for ext4_io_end->flags
169 */
170 #define EXT4_IO_END_UNWRITTEN 0x0001
171
172 /*
173 * For converting unwritten extents on a work queue. 'handle' is used for
174 * buffered writeback.
175 */
176 typedef struct ext4_io_end {
177 struct list_head list; /* per-file finished IO list */
178 handle_t *handle; /* handle reserved for extent
179 * conversion */
180 struct inode *inode; /* file being written to */
181 struct bio *bio; /* Linked list of completed
182 * bios covering the extent */
183 unsigned int flag; /* unwritten or not */
184 loff_t offset; /* offset in the file */
185 ssize_t size; /* size of the extent */
186 atomic_t count; /* reference counter */
187 } ext4_io_end_t;
188
189 struct ext4_io_submit {
190 struct writeback_control *io_wbc;
191 struct bio *io_bio;
192 ext4_io_end_t *io_end;
193 sector_t io_next_block;
194 };
195
196 /*
197 * Special inodes numbers
198 */
199 #define EXT4_BAD_INO 1 /* Bad blocks inode */
200 #define EXT4_ROOT_INO 2 /* Root inode */
201 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
202 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
203 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
204 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
205 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
206 #define EXT4_JOURNAL_INO 8 /* Journal inode */
207
208 /* First non-reserved inode for old ext4 filesystems */
209 #define EXT4_GOOD_OLD_FIRST_INO 11
210
211 /*
212 * Maximal count of links to a file
213 */
214 #define EXT4_LINK_MAX 65000
215
216 /*
217 * Macro-instructions used to manage several block sizes
218 */
219 #define EXT4_MIN_BLOCK_SIZE 1024
220 #define EXT4_MAX_BLOCK_SIZE 65536
221 #define EXT4_MIN_BLOCK_LOG_SIZE 10
222 #define EXT4_MAX_BLOCK_LOG_SIZE 16
223 #ifdef __KERNEL__
224 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
225 #else
226 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
227 #endif
228 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
229 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
230 EXT4_SB(s)->s_cluster_bits)
231 #ifdef __KERNEL__
232 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
233 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
234 #else
235 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
236 #endif
237 #ifdef __KERNEL__
238 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
239 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
240 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
241 #else
242 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
243 EXT4_GOOD_OLD_INODE_SIZE : \
244 (s)->s_inode_size)
245 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
246 EXT4_GOOD_OLD_FIRST_INO : \
247 (s)->s_first_ino)
248 #endif
249 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
250
251 /* Translate a block number to a cluster number */
252 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
253 /* Translate a cluster number to a block number */
254 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
255 /* Translate # of blks to # of clusters */
256 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
257 (sbi)->s_cluster_bits)
258 /* Mask out the low bits to get the starting block of the cluster */
259 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
260 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
261 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
262 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
263 /* Get the cluster offset */
264 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
265 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
266 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
267 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
268
269 /*
270 * Structure of a blocks group descriptor
271 */
272 struct ext4_group_desc
273 {
274 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
275 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
276 __le32 bg_inode_table_lo; /* Inodes table block */
277 __le16 bg_free_blocks_count_lo;/* Free blocks count */
278 __le16 bg_free_inodes_count_lo;/* Free inodes count */
279 __le16 bg_used_dirs_count_lo; /* Directories count */
280 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
281 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
282 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
283 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
284 __le16 bg_itable_unused_lo; /* Unused inodes count */
285 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
286 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
287 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
288 __le32 bg_inode_table_hi; /* Inodes table block MSB */
289 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
290 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
291 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
292 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
293 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
294 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
295 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
296 __u32 bg_reserved;
297 };
298
299 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
300 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
301 sizeof(__le16))
302 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
303 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
304 sizeof(__le16))
305
306 /*
307 * Structure of a flex block group info
308 */
309
310 struct flex_groups {
311 atomic64_t free_clusters;
312 atomic_t free_inodes;
313 atomic_t used_dirs;
314 };
315
316 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
317 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
318 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
319
320 /*
321 * Macro-instructions used to manage group descriptors
322 */
323 #define EXT4_MIN_DESC_SIZE 32
324 #define EXT4_MIN_DESC_SIZE_64BIT 64
325 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
326 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
327 #ifdef __KERNEL__
328 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
329 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
330 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
331 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
332 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
333 #else
334 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
335 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
336 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
337 #endif
338
339 /*
340 * Constants relative to the data blocks
341 */
342 #define EXT4_NDIR_BLOCKS 12
343 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
344 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
345 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
346 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
347
348 /*
349 * Inode flags
350 */
351 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
352 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
353 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
354 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
355 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
356 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
357 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
358 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
359 /* Reserved for compression usage... */
360 #define EXT4_DIRTY_FL 0x00000100
361 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
362 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
363 /* nb: was previously EXT2_ECOMPR_FL */
364 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
365 /* End compression flags --- maybe not all used */
366 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
367 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
368 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
369 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
370 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
371 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
372 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
373 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
374 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
375 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
376 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
377 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
378 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
379
380 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
381 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
382
383 /* Flags that should be inherited by new inodes from their parent. */
384 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
385 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
386 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
387 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
388
389 /* Flags that are appropriate for regular files (all but dir-specific ones). */
390 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
391
392 /* Flags that are appropriate for non-directories/regular files. */
393 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
394
395 /* Mask out flags that are inappropriate for the given type of inode. */
396 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
397 {
398 if (S_ISDIR(mode))
399 return flags;
400 else if (S_ISREG(mode))
401 return flags & EXT4_REG_FLMASK;
402 else
403 return flags & EXT4_OTHER_FLMASK;
404 }
405
406 /*
407 * Inode flags used for atomic set/get
408 */
409 enum {
410 EXT4_INODE_SECRM = 0, /* Secure deletion */
411 EXT4_INODE_UNRM = 1, /* Undelete */
412 EXT4_INODE_COMPR = 2, /* Compress file */
413 EXT4_INODE_SYNC = 3, /* Synchronous updates */
414 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
415 EXT4_INODE_APPEND = 5, /* writes to file may only append */
416 EXT4_INODE_NODUMP = 6, /* do not dump file */
417 EXT4_INODE_NOATIME = 7, /* do not update atime */
418 /* Reserved for compression usage... */
419 EXT4_INODE_DIRTY = 8,
420 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
421 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
422 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
423 /* End compression flags --- maybe not all used */
424 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
425 EXT4_INODE_IMAGIC = 13, /* AFS directory */
426 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
427 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
428 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
429 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
430 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
431 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
432 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
433 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
434 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
435 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
436 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
437 };
438
439 /*
440 * Since it's pretty easy to mix up bit numbers and hex values, we use a
441 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
442 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
443 * any extra space in the compiled kernel image, otherwise, the build will fail.
444 * It's important that these values are the same, since we are using
445 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
446 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
447 * values found in ext2, ext3 and ext4 filesystems, and of course the values
448 * defined in e2fsprogs.
449 *
450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
451 */
452 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
453 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
454
455 static inline void ext4_check_flag_values(void)
456 {
457 CHECK_FLAG_VALUE(SECRM);
458 CHECK_FLAG_VALUE(UNRM);
459 CHECK_FLAG_VALUE(COMPR);
460 CHECK_FLAG_VALUE(SYNC);
461 CHECK_FLAG_VALUE(IMMUTABLE);
462 CHECK_FLAG_VALUE(APPEND);
463 CHECK_FLAG_VALUE(NODUMP);
464 CHECK_FLAG_VALUE(NOATIME);
465 CHECK_FLAG_VALUE(DIRTY);
466 CHECK_FLAG_VALUE(COMPRBLK);
467 CHECK_FLAG_VALUE(NOCOMPR);
468 CHECK_FLAG_VALUE(ENCRYPT);
469 CHECK_FLAG_VALUE(INDEX);
470 CHECK_FLAG_VALUE(IMAGIC);
471 CHECK_FLAG_VALUE(JOURNAL_DATA);
472 CHECK_FLAG_VALUE(NOTAIL);
473 CHECK_FLAG_VALUE(DIRSYNC);
474 CHECK_FLAG_VALUE(TOPDIR);
475 CHECK_FLAG_VALUE(HUGE_FILE);
476 CHECK_FLAG_VALUE(EXTENTS);
477 CHECK_FLAG_VALUE(EA_INODE);
478 CHECK_FLAG_VALUE(EOFBLOCKS);
479 CHECK_FLAG_VALUE(INLINE_DATA);
480 CHECK_FLAG_VALUE(PROJINHERIT);
481 CHECK_FLAG_VALUE(RESERVED);
482 }
483
484 /* Used to pass group descriptor data when online resize is done */
485 struct ext4_new_group_input {
486 __u32 group; /* Group number for this data */
487 __u64 block_bitmap; /* Absolute block number of block bitmap */
488 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
489 __u64 inode_table; /* Absolute block number of inode table start */
490 __u32 blocks_count; /* Total number of blocks in this group */
491 __u16 reserved_blocks; /* Number of reserved blocks in this group */
492 __u16 unused;
493 };
494
495 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
496 struct compat_ext4_new_group_input {
497 u32 group;
498 compat_u64 block_bitmap;
499 compat_u64 inode_bitmap;
500 compat_u64 inode_table;
501 u32 blocks_count;
502 u16 reserved_blocks;
503 u16 unused;
504 };
505 #endif
506
507 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
508 struct ext4_new_group_data {
509 __u32 group;
510 __u64 block_bitmap;
511 __u64 inode_bitmap;
512 __u64 inode_table;
513 __u32 blocks_count;
514 __u16 reserved_blocks;
515 __u16 unused;
516 __u32 free_blocks_count;
517 };
518
519 /* Indexes used to index group tables in ext4_new_group_data */
520 enum {
521 BLOCK_BITMAP = 0, /* block bitmap */
522 INODE_BITMAP, /* inode bitmap */
523 INODE_TABLE, /* inode tables */
524 GROUP_TABLE_COUNT,
525 };
526
527 /*
528 * Flags used by ext4_map_blocks()
529 */
530 /* Allocate any needed blocks and/or convert an unwritten
531 extent to be an initialized ext4 */
532 #define EXT4_GET_BLOCKS_CREATE 0x0001
533 /* Request the creation of an unwritten extent */
534 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
535 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
536 EXT4_GET_BLOCKS_CREATE)
537 /* Caller is from the delayed allocation writeout path
538 * finally doing the actual allocation of delayed blocks */
539 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
540 /* caller is from the direct IO path, request to creation of an
541 unwritten extents if not allocated, split the unwritten
542 extent if blocks has been preallocated already*/
543 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
544 #define EXT4_GET_BLOCKS_CONVERT 0x0010
545 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
547 /* Convert extent to initialized after IO complete */
548 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
549 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
550 /* Eventual metadata allocation (due to growing extent tree)
551 * should not fail, so try to use reserved blocks for that.*/
552 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
553 /* Don't normalize allocation size (used for fallocate) */
554 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
555 /* Request will not result in inode size update (user for fallocate) */
556 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
557 /* Do not take i_data_sem locking in ext4_map_blocks */
558 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
559 /* Convert written extents to unwritten */
560 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
561
562 /*
563 * The bit position of these flags must not overlap with any of the
564 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
565 * read_extent_tree_block(), ext4_split_extent_at(),
566 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
567 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
568 * caching the extents when reading from the extent tree while a
569 * truncate or punch hole operation is in progress.
570 */
571 #define EXT4_EX_NOCACHE 0x40000000
572 #define EXT4_EX_FORCE_CACHE 0x20000000
573
574 /*
575 * Flags used by ext4_free_blocks
576 */
577 #define EXT4_FREE_BLOCKS_METADATA 0x0001
578 #define EXT4_FREE_BLOCKS_FORGET 0x0002
579 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
583
584 /* Encryption algorithms */
585 #define EXT4_ENCRYPTION_MODE_INVALID 0
586 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
587 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
588 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
589 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
590
591 #include "ext4_crypto.h"
592
593 /*
594 * ioctl commands
595 */
596 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
597 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
598 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
599 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
600 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
601 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
602 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
603 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
604 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
605 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
606 #define EXT4_IOC_MIGRATE _IO('f', 9)
607 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
608 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
609 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
610 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
611 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
612 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
613 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
614 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy)
615 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
616 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)
617
618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
619 /*
620 * ioctl commands in 32 bit emulation
621 */
622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
632 #endif
633
634 /* Max physical block we can address w/o extents */
635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
636
637 /*
638 * Structure of an inode on the disk
639 */
640 struct ext4_inode {
641 __le16 i_mode; /* File mode */
642 __le16 i_uid; /* Low 16 bits of Owner Uid */
643 __le32 i_size_lo; /* Size in bytes */
644 __le32 i_atime; /* Access time */
645 __le32 i_ctime; /* Inode Change time */
646 __le32 i_mtime; /* Modification time */
647 __le32 i_dtime; /* Deletion Time */
648 __le16 i_gid; /* Low 16 bits of Group Id */
649 __le16 i_links_count; /* Links count */
650 __le32 i_blocks_lo; /* Blocks count */
651 __le32 i_flags; /* File flags */
652 union {
653 struct {
654 __le32 l_i_version;
655 } linux1;
656 struct {
657 __u32 h_i_translator;
658 } hurd1;
659 struct {
660 __u32 m_i_reserved1;
661 } masix1;
662 } osd1; /* OS dependent 1 */
663 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
664 __le32 i_generation; /* File version (for NFS) */
665 __le32 i_file_acl_lo; /* File ACL */
666 __le32 i_size_high;
667 __le32 i_obso_faddr; /* Obsoleted fragment address */
668 union {
669 struct {
670 __le16 l_i_blocks_high; /* were l_i_reserved1 */
671 __le16 l_i_file_acl_high;
672 __le16 l_i_uid_high; /* these 2 fields */
673 __le16 l_i_gid_high; /* were reserved2[0] */
674 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
675 __le16 l_i_reserved;
676 } linux2;
677 struct {
678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
679 __u16 h_i_mode_high;
680 __u16 h_i_uid_high;
681 __u16 h_i_gid_high;
682 __u32 h_i_author;
683 } hurd2;
684 struct {
685 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
686 __le16 m_i_file_acl_high;
687 __u32 m_i_reserved2[2];
688 } masix2;
689 } osd2; /* OS dependent 2 */
690 __le16 i_extra_isize;
691 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
692 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
693 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
694 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
695 __le32 i_crtime; /* File Creation time */
696 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
697 __le32 i_version_hi; /* high 32 bits for 64-bit version */
698 __le32 i_projid; /* Project ID */
699 };
700
701 struct move_extent {
702 __u32 reserved; /* should be zero */
703 __u32 donor_fd; /* donor file descriptor */
704 __u64 orig_start; /* logical start offset in block for orig */
705 __u64 donor_start; /* logical start offset in block for donor */
706 __u64 len; /* block length to be moved */
707 __u64 moved_len; /* moved block length */
708 };
709
710 #define EXT4_EPOCH_BITS 2
711 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
712 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
713
714 /*
715 * Extended fields will fit into an inode if the filesystem was formatted
716 * with large inodes (-I 256 or larger) and there are not currently any EAs
717 * consuming all of the available space. For new inodes we always reserve
718 * enough space for the kernel's known extended fields, but for inodes
719 * created with an old kernel this might not have been the case. None of
720 * the extended inode fields is critical for correct filesystem operation.
721 * This macro checks if a certain field fits in the inode. Note that
722 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
723 */
724 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
725 ((offsetof(typeof(*ext4_inode), field) + \
726 sizeof((ext4_inode)->field)) \
727 <= (EXT4_GOOD_OLD_INODE_SIZE + \
728 (einode)->i_extra_isize)) \
729
730 static inline __le32 ext4_encode_extra_time(struct timespec *time)
731 {
732 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
733 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
734 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
735 }
736
737 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
738 {
739 if (sizeof(time->tv_sec) > 4)
740 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
741 << 32;
742 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
743 }
744
745 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
746 do { \
747 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
748 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
749 (raw_inode)->xtime ## _extra = \
750 ext4_encode_extra_time(&(inode)->xtime); \
751 } while (0)
752
753 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
754 do { \
755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
756 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
758 (raw_inode)->xtime ## _extra = \
759 ext4_encode_extra_time(&(einode)->xtime); \
760 } while (0)
761
762 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
763 do { \
764 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
765 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
766 ext4_decode_extra_time(&(inode)->xtime, \
767 raw_inode->xtime ## _extra); \
768 else \
769 (inode)->xtime.tv_nsec = 0; \
770 } while (0)
771
772 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
773 do { \
774 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
775 (einode)->xtime.tv_sec = \
776 (signed)le32_to_cpu((raw_inode)->xtime); \
777 else \
778 (einode)->xtime.tv_sec = 0; \
779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
780 ext4_decode_extra_time(&(einode)->xtime, \
781 raw_inode->xtime ## _extra); \
782 else \
783 (einode)->xtime.tv_nsec = 0; \
784 } while (0)
785
786 #define i_disk_version osd1.linux1.l_i_version
787
788 #if defined(__KERNEL__) || defined(__linux__)
789 #define i_reserved1 osd1.linux1.l_i_reserved1
790 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
791 #define i_blocks_high osd2.linux2.l_i_blocks_high
792 #define i_uid_low i_uid
793 #define i_gid_low i_gid
794 #define i_uid_high osd2.linux2.l_i_uid_high
795 #define i_gid_high osd2.linux2.l_i_gid_high
796 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
797
798 #elif defined(__GNU__)
799
800 #define i_translator osd1.hurd1.h_i_translator
801 #define i_uid_high osd2.hurd2.h_i_uid_high
802 #define i_gid_high osd2.hurd2.h_i_gid_high
803 #define i_author osd2.hurd2.h_i_author
804
805 #elif defined(__masix__)
806
807 #define i_reserved1 osd1.masix1.m_i_reserved1
808 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
809 #define i_reserved2 osd2.masix2.m_i_reserved2
810
811 #endif /* defined(__KERNEL__) || defined(__linux__) */
812
813 #include "extents_status.h"
814
815 /*
816 * fourth extended file system inode data in memory
817 */
818 struct ext4_inode_info {
819 __le32 i_data[15]; /* unconverted */
820 __u32 i_dtime;
821 ext4_fsblk_t i_file_acl;
822
823 /*
824 * i_block_group is the number of the block group which contains
825 * this file's inode. Constant across the lifetime of the inode,
826 * it is ued for making block allocation decisions - we try to
827 * place a file's data blocks near its inode block, and new inodes
828 * near to their parent directory's inode.
829 */
830 ext4_group_t i_block_group;
831 ext4_lblk_t i_dir_start_lookup;
832 #if (BITS_PER_LONG < 64)
833 unsigned long i_state_flags; /* Dynamic state flags */
834 #endif
835 unsigned long i_flags;
836
837 /*
838 * Extended attributes can be read independently of the main file
839 * data. Taking i_mutex even when reading would cause contention
840 * between readers of EAs and writers of regular file data, so
841 * instead we synchronize on xattr_sem when reading or changing
842 * EAs.
843 */
844 struct rw_semaphore xattr_sem;
845
846 struct list_head i_orphan; /* unlinked but open inodes */
847
848 /*
849 * i_disksize keeps track of what the inode size is ON DISK, not
850 * in memory. During truncate, i_size is set to the new size by
851 * the VFS prior to calling ext4_truncate(), but the filesystem won't
852 * set i_disksize to 0 until the truncate is actually under way.
853 *
854 * The intent is that i_disksize always represents the blocks which
855 * are used by this file. This allows recovery to restart truncate
856 * on orphans if we crash during truncate. We actually write i_disksize
857 * into the on-disk inode when writing inodes out, instead of i_size.
858 *
859 * The only time when i_disksize and i_size may be different is when
860 * a truncate is in progress. The only things which change i_disksize
861 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
862 */
863 loff_t i_disksize;
864
865 /*
866 * i_data_sem is for serialising ext4_truncate() against
867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
868 * data tree are chopped off during truncate. We can't do that in
869 * ext4 because whenever we perform intermediate commits during
870 * truncate, the inode and all the metadata blocks *must* be in a
871 * consistent state which allows truncation of the orphans to restart
872 * during recovery. Hence we must fix the get_block-vs-truncate race
873 * by other means, so we have i_data_sem.
874 */
875 struct rw_semaphore i_data_sem;
876 struct inode vfs_inode;
877 struct jbd2_inode *jinode;
878
879 spinlock_t i_raw_lock; /* protects updates to the raw inode */
880
881 /*
882 * File creation time. Its function is same as that of
883 * struct timespec i_{a,c,m}time in the generic inode.
884 */
885 struct timespec i_crtime;
886
887 /* mballoc */
888 struct list_head i_prealloc_list;
889 spinlock_t i_prealloc_lock;
890
891 /* extents status tree */
892 struct ext4_es_tree i_es_tree;
893 rwlock_t i_es_lock;
894 struct list_head i_es_list;
895 unsigned int i_es_all_nr; /* protected by i_es_lock */
896 unsigned int i_es_shk_nr; /* protected by i_es_lock */
897 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
898 extents to shrink. Protected by
899 i_es_lock */
900
901 /* ialloc */
902 ext4_group_t i_last_alloc_group;
903
904 /* allocation reservation info for delalloc */
905 /* In case of bigalloc, these refer to clusters rather than blocks */
906 unsigned int i_reserved_data_blocks;
907 unsigned int i_reserved_meta_blocks;
908 unsigned int i_allocated_meta_blocks;
909 ext4_lblk_t i_da_metadata_calc_last_lblock;
910 int i_da_metadata_calc_len;
911
912 /* on-disk additional length */
913 __u16 i_extra_isize;
914
915 /* Indicate the inline data space. */
916 u16 i_inline_off;
917 u16 i_inline_size;
918
919 #ifdef CONFIG_QUOTA
920 /* quota space reservation, managed internally by quota code */
921 qsize_t i_reserved_quota;
922 #endif
923
924 /* Lock protecting lists below */
925 spinlock_t i_completed_io_lock;
926 /*
927 * Completed IOs that need unwritten extents handling and have
928 * transaction reserved
929 */
930 struct list_head i_rsv_conversion_list;
931 /*
932 * Completed IOs that need unwritten extents handling and don't have
933 * transaction reserved
934 */
935 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
936 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
937 struct work_struct i_rsv_conversion_work;
938
939 spinlock_t i_block_reservation_lock;
940
941 /*
942 * Transactions that contain inode's metadata needed to complete
943 * fsync and fdatasync, respectively.
944 */
945 tid_t i_sync_tid;
946 tid_t i_datasync_tid;
947
948 #ifdef CONFIG_QUOTA
949 struct dquot *i_dquot[MAXQUOTAS];
950 #endif
951
952 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
953 __u32 i_csum_seed;
954
955 #ifdef CONFIG_EXT4_FS_ENCRYPTION
956 /* Encryption params */
957 struct ext4_crypt_info *i_crypt_info;
958 #endif
959 };
960
961 /*
962 * File system states
963 */
964 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
965 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
966 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
967
968 /*
969 * Misc. filesystem flags
970 */
971 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
972 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
973 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
974
975 /*
976 * Mount flags set via mount options or defaults
977 */
978 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
979 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
980 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
981 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
982 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
983 #define EXT4_MOUNT_ERRORS_MASK 0x00070
984 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
985 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
986 #ifdef CONFIG_FS_DAX
987 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
988 #else
989 #define EXT4_MOUNT_DAX 0
990 #endif
991 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
992 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
993 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
994 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
995 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
996 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
997 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
998 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
999 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1000 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1001 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
1002 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
1003 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
1004 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1005 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1006 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1007 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1008 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1009 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1010 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1011 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1012
1013 /*
1014 * Mount flags set either automatically (could not be set by mount option)
1015 * based on per file system feature or property or in special cases such as
1016 * distinguishing between explicit mount option definition and default.
1017 */
1018 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1019 specified delalloc */
1020 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1021 size of blocksize * 8
1022 blocks */
1023 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1024 file systems */
1025
1026 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1027 specified journal checksum */
1028
1029 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1030 ~EXT4_MOUNT_##opt
1031 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1032 EXT4_MOUNT_##opt
1033 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1034 EXT4_MOUNT_##opt)
1035
1036 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1037 ~EXT4_MOUNT2_##opt
1038 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1039 EXT4_MOUNT2_##opt
1040 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1041 EXT4_MOUNT2_##opt)
1042
1043 #define ext4_test_and_set_bit __test_and_set_bit_le
1044 #define ext4_set_bit __set_bit_le
1045 #define ext4_set_bit_atomic ext2_set_bit_atomic
1046 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1047 #define ext4_clear_bit __clear_bit_le
1048 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1049 #define ext4_test_bit test_bit_le
1050 #define ext4_find_next_zero_bit find_next_zero_bit_le
1051 #define ext4_find_next_bit find_next_bit_le
1052
1053 extern void ext4_set_bits(void *bm, int cur, int len);
1054
1055 /*
1056 * Maximal mount counts between two filesystem checks
1057 */
1058 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1059 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1060
1061 /*
1062 * Behaviour when detecting errors
1063 */
1064 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1065 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1066 #define EXT4_ERRORS_PANIC 3 /* Panic */
1067 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1068
1069 /* Metadata checksum algorithm codes */
1070 #define EXT4_CRC32C_CHKSUM 1
1071
1072 /*
1073 * Structure of the super block
1074 */
1075 struct ext4_super_block {
1076 /*00*/ __le32 s_inodes_count; /* Inodes count */
1077 __le32 s_blocks_count_lo; /* Blocks count */
1078 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1079 __le32 s_free_blocks_count_lo; /* Free blocks count */
1080 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1081 __le32 s_first_data_block; /* First Data Block */
1082 __le32 s_log_block_size; /* Block size */
1083 __le32 s_log_cluster_size; /* Allocation cluster size */
1084 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1085 __le32 s_clusters_per_group; /* # Clusters per group */
1086 __le32 s_inodes_per_group; /* # Inodes per group */
1087 __le32 s_mtime; /* Mount time */
1088 /*30*/ __le32 s_wtime; /* Write time */
1089 __le16 s_mnt_count; /* Mount count */
1090 __le16 s_max_mnt_count; /* Maximal mount count */
1091 __le16 s_magic; /* Magic signature */
1092 __le16 s_state; /* File system state */
1093 __le16 s_errors; /* Behaviour when detecting errors */
1094 __le16 s_minor_rev_level; /* minor revision level */
1095 /*40*/ __le32 s_lastcheck; /* time of last check */
1096 __le32 s_checkinterval; /* max. time between checks */
1097 __le32 s_creator_os; /* OS */
1098 __le32 s_rev_level; /* Revision level */
1099 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1100 __le16 s_def_resgid; /* Default gid for reserved blocks */
1101 /*
1102 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1103 *
1104 * Note: the difference between the compatible feature set and
1105 * the incompatible feature set is that if there is a bit set
1106 * in the incompatible feature set that the kernel doesn't
1107 * know about, it should refuse to mount the filesystem.
1108 *
1109 * e2fsck's requirements are more strict; if it doesn't know
1110 * about a feature in either the compatible or incompatible
1111 * feature set, it must abort and not try to meddle with
1112 * things it doesn't understand...
1113 */
1114 __le32 s_first_ino; /* First non-reserved inode */
1115 __le16 s_inode_size; /* size of inode structure */
1116 __le16 s_block_group_nr; /* block group # of this superblock */
1117 __le32 s_feature_compat; /* compatible feature set */
1118 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1119 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1120 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1121 /*78*/ char s_volume_name[16]; /* volume name */
1122 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1123 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1124 /*
1125 * Performance hints. Directory preallocation should only
1126 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1127 */
1128 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1129 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1130 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1131 /*
1132 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1133 */
1134 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1135 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1136 __le32 s_journal_dev; /* device number of journal file */
1137 __le32 s_last_orphan; /* start of list of inodes to delete */
1138 __le32 s_hash_seed[4]; /* HTREE hash seed */
1139 __u8 s_def_hash_version; /* Default hash version to use */
1140 __u8 s_jnl_backup_type;
1141 __le16 s_desc_size; /* size of group descriptor */
1142 /*100*/ __le32 s_default_mount_opts;
1143 __le32 s_first_meta_bg; /* First metablock block group */
1144 __le32 s_mkfs_time; /* When the filesystem was created */
1145 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1146 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1147 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1148 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1149 __le32 s_free_blocks_count_hi; /* Free blocks count */
1150 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1151 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1152 __le32 s_flags; /* Miscellaneous flags */
1153 __le16 s_raid_stride; /* RAID stride */
1154 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1155 __le64 s_mmp_block; /* Block for multi-mount protection */
1156 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1157 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1158 __u8 s_checksum_type; /* metadata checksum algorithm used */
1159 __u8 s_encryption_level; /* versioning level for encryption */
1160 __u8 s_reserved_pad; /* Padding to next 32bits */
1161 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1162 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1163 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1164 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1165 snapshot's future use */
1166 __le32 s_snapshot_list; /* inode number of the head of the
1167 on-disk snapshot list */
1168 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1169 __le32 s_error_count; /* number of fs errors */
1170 __le32 s_first_error_time; /* first time an error happened */
1171 __le32 s_first_error_ino; /* inode involved in first error */
1172 __le64 s_first_error_block; /* block involved of first error */
1173 __u8 s_first_error_func[32]; /* function where the error happened */
1174 __le32 s_first_error_line; /* line number where error happened */
1175 __le32 s_last_error_time; /* most recent time of an error */
1176 __le32 s_last_error_ino; /* inode involved in last error */
1177 __le32 s_last_error_line; /* line number where error happened */
1178 __le64 s_last_error_block; /* block involved of last error */
1179 __u8 s_last_error_func[32]; /* function where the error happened */
1180 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1181 __u8 s_mount_opts[64];
1182 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1183 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1184 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1185 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1186 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1187 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1188 __le32 s_lpf_ino; /* Location of the lost+found inode */
1189 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1190 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1191 __le32 s_reserved[98]; /* Padding to the end of the block */
1192 __le32 s_checksum; /* crc32c(superblock) */
1193 };
1194
1195 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1196
1197 #ifdef __KERNEL__
1198
1199 /*
1200 * run-time mount flags
1201 */
1202 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1203 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1204 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1205
1206 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1207 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1208 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1209 #else
1210 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1211 #endif
1212
1213 /* Number of quota types we support */
1214 #define EXT4_MAXQUOTAS 2
1215
1216 /*
1217 * fourth extended-fs super-block data in memory
1218 */
1219 struct ext4_sb_info {
1220 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1221 unsigned long s_inodes_per_block;/* Number of inodes per block */
1222 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1223 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1224 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1225 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1226 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1227 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1228 ext4_group_t s_groups_count; /* Number of groups in the fs */
1229 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1230 unsigned long s_overhead; /* # of fs overhead clusters */
1231 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1232 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1233 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1234 struct buffer_head * s_sbh; /* Buffer containing the super block */
1235 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1236 struct buffer_head **s_group_desc;
1237 unsigned int s_mount_opt;
1238 unsigned int s_mount_opt2;
1239 unsigned int s_mount_flags;
1240 unsigned int s_def_mount_opt;
1241 ext4_fsblk_t s_sb_block;
1242 atomic64_t s_resv_clusters;
1243 kuid_t s_resuid;
1244 kgid_t s_resgid;
1245 unsigned short s_mount_state;
1246 unsigned short s_pad;
1247 int s_addr_per_block_bits;
1248 int s_desc_per_block_bits;
1249 int s_inode_size;
1250 int s_first_ino;
1251 unsigned int s_inode_readahead_blks;
1252 unsigned int s_inode_goal;
1253 spinlock_t s_next_gen_lock;
1254 u32 s_next_generation;
1255 u32 s_hash_seed[4];
1256 int s_def_hash_version;
1257 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1258 struct percpu_counter s_freeclusters_counter;
1259 struct percpu_counter s_freeinodes_counter;
1260 struct percpu_counter s_dirs_counter;
1261 struct percpu_counter s_dirtyclusters_counter;
1262 struct blockgroup_lock *s_blockgroup_lock;
1263 struct proc_dir_entry *s_proc;
1264 struct kobject s_kobj;
1265 struct completion s_kobj_unregister;
1266 struct super_block *s_sb;
1267
1268 /* Journaling */
1269 struct journal_s *s_journal;
1270 struct list_head s_orphan;
1271 struct mutex s_orphan_lock;
1272 unsigned long s_resize_flags; /* Flags indicating if there
1273 is a resizer */
1274 unsigned long s_commit_interval;
1275 u32 s_max_batch_time;
1276 u32 s_min_batch_time;
1277 struct block_device *journal_bdev;
1278 #ifdef CONFIG_QUOTA
1279 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
1280 int s_jquota_fmt; /* Format of quota to use */
1281 #endif
1282 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1283 struct rb_root system_blks;
1284
1285 #ifdef EXTENTS_STATS
1286 /* ext4 extents stats */
1287 unsigned long s_ext_min;
1288 unsigned long s_ext_max;
1289 unsigned long s_depth_max;
1290 spinlock_t s_ext_stats_lock;
1291 unsigned long s_ext_blocks;
1292 unsigned long s_ext_extents;
1293 #endif
1294
1295 /* for buddy allocator */
1296 struct ext4_group_info ***s_group_info;
1297 struct inode *s_buddy_cache;
1298 spinlock_t s_md_lock;
1299 unsigned short *s_mb_offsets;
1300 unsigned int *s_mb_maxs;
1301 unsigned int s_group_info_size;
1302
1303 /* tunables */
1304 unsigned long s_stripe;
1305 unsigned int s_mb_stream_request;
1306 unsigned int s_mb_max_to_scan;
1307 unsigned int s_mb_min_to_scan;
1308 unsigned int s_mb_stats;
1309 unsigned int s_mb_order2_reqs;
1310 unsigned int s_mb_group_prealloc;
1311 unsigned int s_max_dir_size_kb;
1312 /* where last allocation was done - for stream allocation */
1313 unsigned long s_mb_last_group;
1314 unsigned long s_mb_last_start;
1315
1316 /* stats for buddy allocator */
1317 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1318 atomic_t s_bal_success; /* we found long enough chunks */
1319 atomic_t s_bal_allocated; /* in blocks */
1320 atomic_t s_bal_ex_scanned; /* total extents scanned */
1321 atomic_t s_bal_goals; /* goal hits */
1322 atomic_t s_bal_breaks; /* too long searches */
1323 atomic_t s_bal_2orders; /* 2^order hits */
1324 spinlock_t s_bal_lock;
1325 unsigned long s_mb_buddies_generated;
1326 unsigned long long s_mb_generation_time;
1327 atomic_t s_mb_lost_chunks;
1328 atomic_t s_mb_preallocated;
1329 atomic_t s_mb_discarded;
1330 atomic_t s_lock_busy;
1331
1332 /* locality groups */
1333 struct ext4_locality_group __percpu *s_locality_groups;
1334
1335 /* for write statistics */
1336 unsigned long s_sectors_written_start;
1337 u64 s_kbytes_written;
1338
1339 /* the size of zero-out chunk */
1340 unsigned int s_extent_max_zeroout_kb;
1341
1342 unsigned int s_log_groups_per_flex;
1343 struct flex_groups *s_flex_groups;
1344 ext4_group_t s_flex_groups_allocated;
1345
1346 /* workqueue for reserved extent conversions (buffered io) */
1347 struct workqueue_struct *rsv_conversion_wq;
1348
1349 /* timer for periodic error stats printing */
1350 struct timer_list s_err_report;
1351
1352 /* Lazy inode table initialization info */
1353 struct ext4_li_request *s_li_request;
1354 /* Wait multiplier for lazy initialization thread */
1355 unsigned int s_li_wait_mult;
1356
1357 /* Kernel thread for multiple mount protection */
1358 struct task_struct *s_mmp_tsk;
1359
1360 /* record the last minlen when FITRIM is called. */
1361 atomic_t s_last_trim_minblks;
1362
1363 /* Reference to checksum algorithm driver via cryptoapi */
1364 struct crypto_shash *s_chksum_driver;
1365
1366 /* Precomputed FS UUID checksum for seeding other checksums */
1367 __u32 s_csum_seed;
1368
1369 /* Reclaim extents from extent status tree */
1370 struct shrinker s_es_shrinker;
1371 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1372 long s_es_nr_inode;
1373 struct ext4_es_stats s_es_stats;
1374 struct mb_cache *s_mb_cache;
1375 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1376
1377 /* Ratelimit ext4 messages. */
1378 struct ratelimit_state s_err_ratelimit_state;
1379 struct ratelimit_state s_warning_ratelimit_state;
1380 struct ratelimit_state s_msg_ratelimit_state;
1381 };
1382
1383 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1384 {
1385 return sb->s_fs_info;
1386 }
1387 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1388 {
1389 return container_of(inode, struct ext4_inode_info, vfs_inode);
1390 }
1391
1392 static inline struct timespec ext4_current_time(struct inode *inode)
1393 {
1394 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1395 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1396 }
1397
1398 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1399 {
1400 return ino == EXT4_ROOT_INO ||
1401 ino == EXT4_USR_QUOTA_INO ||
1402 ino == EXT4_GRP_QUOTA_INO ||
1403 ino == EXT4_BOOT_LOADER_INO ||
1404 ino == EXT4_JOURNAL_INO ||
1405 ino == EXT4_RESIZE_INO ||
1406 (ino >= EXT4_FIRST_INO(sb) &&
1407 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1408 }
1409
1410 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1411 struct ext4_io_end *io_end)
1412 {
1413 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1414 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1415 atomic_inc(&EXT4_I(inode)->i_unwritten);
1416 }
1417 }
1418
1419 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1420 {
1421 return inode->i_private;
1422 }
1423
1424 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1425 {
1426 inode->i_private = io;
1427 }
1428
1429 /*
1430 * Inode dynamic state flags
1431 */
1432 enum {
1433 EXT4_STATE_JDATA, /* journaled data exists */
1434 EXT4_STATE_NEW, /* inode is newly created */
1435 EXT4_STATE_XATTR, /* has in-inode xattrs */
1436 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1437 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1438 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1439 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1440 EXT4_STATE_NEWENTRY, /* File just added to dir */
1441 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1442 nolocking */
1443 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1444 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1445 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1446 };
1447
1448 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1449 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1450 { \
1451 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1452 } \
1453 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1454 { \
1455 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1456 } \
1457 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1458 { \
1459 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1460 }
1461
1462 /* Add these declarations here only so that these functions can be
1463 * found by name. Otherwise, they are very hard to locate. */
1464 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1465 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1466 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1467 EXT4_INODE_BIT_FNS(flag, flags, 0)
1468
1469 /* Add these declarations here only so that these functions can be
1470 * found by name. Otherwise, they are very hard to locate. */
1471 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1472 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1473 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1474 #if (BITS_PER_LONG < 64)
1475 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1476
1477 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1478 {
1479 (ei)->i_state_flags = 0;
1480 }
1481 #else
1482 EXT4_INODE_BIT_FNS(state, flags, 32)
1483
1484 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1485 {
1486 /* We depend on the fact that callers will set i_flags */
1487 }
1488 #endif
1489 #else
1490 /* Assume that user mode programs are passing in an ext4fs superblock, not
1491 * a kernel struct super_block. This will allow us to call the feature-test
1492 * macros from user land. */
1493 #define EXT4_SB(sb) (sb)
1494 #endif
1495
1496 /*
1497 * Returns true if the inode is inode is encrypted
1498 */
1499 static inline int ext4_encrypted_inode(struct inode *inode)
1500 {
1501 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1502 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1503 #else
1504 return 0;
1505 #endif
1506 }
1507
1508 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1509
1510 /*
1511 * Codes for operating systems
1512 */
1513 #define EXT4_OS_LINUX 0
1514 #define EXT4_OS_HURD 1
1515 #define EXT4_OS_MASIX 2
1516 #define EXT4_OS_FREEBSD 3
1517 #define EXT4_OS_LITES 4
1518
1519 /*
1520 * Revision levels
1521 */
1522 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1523 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1524
1525 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1526 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1527
1528 #define EXT4_GOOD_OLD_INODE_SIZE 128
1529
1530 /*
1531 * Feature set definitions
1532 */
1533
1534 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1535 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1536 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1537 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1538 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1539 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1540 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1541 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1542 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1543 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1544 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1545 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1546 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1547 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1548 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1549 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1550 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1551 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1552 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1553
1554 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1555 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1556 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1557 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1558 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1559 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1560 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1561
1562 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1563 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1564 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1565 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1566 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1567 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1568 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1569 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1570 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1571 /*
1572 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1573 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1574 * all other data structures' checksums. However, the METADATA_CSUM and
1575 * GDT_CSUM bits are mutually exclusive.
1576 */
1577 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1578 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1579 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1580
1581 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1582 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1583 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1584 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1585 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1586 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1587 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1588 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1589 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1590 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1591 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1592 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1593 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1594 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1595 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1596
1597 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1598 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1599 { \
1600 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1601 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1602 } \
1603 static inline void ext4_set_feature_##name(struct super_block *sb) \
1604 { \
1605 EXT4_SB(sb)->s_es->s_feature_compat |= \
1606 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1607 } \
1608 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1609 { \
1610 EXT4_SB(sb)->s_es->s_feature_compat &= \
1611 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1612 }
1613
1614 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1615 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1616 { \
1617 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1618 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1619 } \
1620 static inline void ext4_set_feature_##name(struct super_block *sb) \
1621 { \
1622 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1623 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1624 } \
1625 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1626 { \
1627 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1628 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1629 }
1630
1631 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1632 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1633 { \
1634 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1635 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1636 } \
1637 static inline void ext4_set_feature_##name(struct super_block *sb) \
1638 { \
1639 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1640 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1641 } \
1642 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1643 { \
1644 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1645 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1646 }
1647
1648 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
1649 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
1650 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
1651 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
1652 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
1653 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
1654 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
1655
1656 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
1657 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
1658 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
1659 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
1660 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
1661 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
1662 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
1663 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
1664 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
1665 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
1666 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
1667 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
1668
1669 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
1670 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
1671 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
1672 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
1673 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
1674 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
1675 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
1676 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
1677 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
1678 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
1679 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
1680 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
1681 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
1682 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
1683 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
1684
1685 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1686 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1687 EXT4_FEATURE_INCOMPAT_META_BG)
1688 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1689 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1690 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1691
1692 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1693 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1694 EXT4_FEATURE_INCOMPAT_RECOVER| \
1695 EXT4_FEATURE_INCOMPAT_META_BG)
1696 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1697 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1698 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1699
1700 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1701 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1702 EXT4_FEATURE_INCOMPAT_RECOVER| \
1703 EXT4_FEATURE_INCOMPAT_META_BG| \
1704 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1705 EXT4_FEATURE_INCOMPAT_64BIT| \
1706 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1707 EXT4_FEATURE_INCOMPAT_MMP | \
1708 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1709 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1710 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1711 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1712 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1713 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1714 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1715 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1716 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1717 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1718 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1719 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1720 EXT4_FEATURE_RO_COMPAT_QUOTA)
1721
1722 #define EXTN_FEATURE_FUNCS(ver) \
1723 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1724 { \
1725 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1726 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1727 } \
1728 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1729 { \
1730 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1731 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1732 } \
1733 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1734 { \
1735 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1736 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1737 }
1738
1739 EXTN_FEATURE_FUNCS(2)
1740 EXTN_FEATURE_FUNCS(3)
1741 EXTN_FEATURE_FUNCS(4)
1742
1743 static inline bool ext4_has_compat_features(struct super_block *sb)
1744 {
1745 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
1746 }
1747 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
1748 {
1749 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
1750 }
1751 static inline bool ext4_has_incompat_features(struct super_block *sb)
1752 {
1753 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
1754 }
1755
1756 /*
1757 * Default values for user and/or group using reserved blocks
1758 */
1759 #define EXT4_DEF_RESUID 0
1760 #define EXT4_DEF_RESGID 0
1761
1762 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1763
1764 /*
1765 * Default mount options
1766 */
1767 #define EXT4_DEFM_DEBUG 0x0001
1768 #define EXT4_DEFM_BSDGROUPS 0x0002
1769 #define EXT4_DEFM_XATTR_USER 0x0004
1770 #define EXT4_DEFM_ACL 0x0008
1771 #define EXT4_DEFM_UID16 0x0010
1772 #define EXT4_DEFM_JMODE 0x0060
1773 #define EXT4_DEFM_JMODE_DATA 0x0020
1774 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1775 #define EXT4_DEFM_JMODE_WBACK 0x0060
1776 #define EXT4_DEFM_NOBARRIER 0x0100
1777 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1778 #define EXT4_DEFM_DISCARD 0x0400
1779 #define EXT4_DEFM_NODELALLOC 0x0800
1780
1781 /*
1782 * Default journal batch times
1783 */
1784 #define EXT4_DEF_MIN_BATCH_TIME 0
1785 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1786
1787 /*
1788 * Minimum number of groups in a flexgroup before we separate out
1789 * directories into the first block group of a flexgroup
1790 */
1791 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1792
1793 /*
1794 * Structure of a directory entry
1795 */
1796 #define EXT4_NAME_LEN 255
1797
1798 struct ext4_dir_entry {
1799 __le32 inode; /* Inode number */
1800 __le16 rec_len; /* Directory entry length */
1801 __le16 name_len; /* Name length */
1802 char name[EXT4_NAME_LEN]; /* File name */
1803 };
1804
1805 /*
1806 * The new version of the directory entry. Since EXT4 structures are
1807 * stored in intel byte order, and the name_len field could never be
1808 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1809 * file_type field.
1810 */
1811 struct ext4_dir_entry_2 {
1812 __le32 inode; /* Inode number */
1813 __le16 rec_len; /* Directory entry length */
1814 __u8 name_len; /* Name length */
1815 __u8 file_type;
1816 char name[EXT4_NAME_LEN]; /* File name */
1817 };
1818
1819 /*
1820 * This is a bogus directory entry at the end of each leaf block that
1821 * records checksums.
1822 */
1823 struct ext4_dir_entry_tail {
1824 __le32 det_reserved_zero1; /* Pretend to be unused */
1825 __le16 det_rec_len; /* 12 */
1826 __u8 det_reserved_zero2; /* Zero name length */
1827 __u8 det_reserved_ft; /* 0xDE, fake file type */
1828 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1829 };
1830
1831 #define EXT4_DIRENT_TAIL(block, blocksize) \
1832 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1833 ((blocksize) - \
1834 sizeof(struct ext4_dir_entry_tail))))
1835
1836 /*
1837 * Ext4 directory file types. Only the low 3 bits are used. The
1838 * other bits are reserved for now.
1839 */
1840 #define EXT4_FT_UNKNOWN 0
1841 #define EXT4_FT_REG_FILE 1
1842 #define EXT4_FT_DIR 2
1843 #define EXT4_FT_CHRDEV 3
1844 #define EXT4_FT_BLKDEV 4
1845 #define EXT4_FT_FIFO 5
1846 #define EXT4_FT_SOCK 6
1847 #define EXT4_FT_SYMLINK 7
1848
1849 #define EXT4_FT_MAX 8
1850
1851 #define EXT4_FT_DIR_CSUM 0xDE
1852
1853 /*
1854 * EXT4_DIR_PAD defines the directory entries boundaries
1855 *
1856 * NOTE: It must be a multiple of 4
1857 */
1858 #define EXT4_DIR_PAD 4
1859 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1860 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1861 ~EXT4_DIR_ROUND)
1862 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1863
1864 /*
1865 * If we ever get support for fs block sizes > page_size, we'll need
1866 * to remove the #if statements in the next two functions...
1867 */
1868 static inline unsigned int
1869 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1870 {
1871 unsigned len = le16_to_cpu(dlen);
1872
1873 #if (PAGE_CACHE_SIZE >= 65536)
1874 if (len == EXT4_MAX_REC_LEN || len == 0)
1875 return blocksize;
1876 return (len & 65532) | ((len & 3) << 16);
1877 #else
1878 return len;
1879 #endif
1880 }
1881
1882 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1883 {
1884 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1885 BUG();
1886 #if (PAGE_CACHE_SIZE >= 65536)
1887 if (len < 65536)
1888 return cpu_to_le16(len);
1889 if (len == blocksize) {
1890 if (blocksize == 65536)
1891 return cpu_to_le16(EXT4_MAX_REC_LEN);
1892 else
1893 return cpu_to_le16(0);
1894 }
1895 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1896 #else
1897 return cpu_to_le16(len);
1898 #endif
1899 }
1900
1901 /*
1902 * Hash Tree Directory indexing
1903 * (c) Daniel Phillips, 2001
1904 */
1905
1906 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
1907 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1908 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1909 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1910
1911 /* Legal values for the dx_root hash_version field: */
1912
1913 #define DX_HASH_LEGACY 0
1914 #define DX_HASH_HALF_MD4 1
1915 #define DX_HASH_TEA 2
1916 #define DX_HASH_LEGACY_UNSIGNED 3
1917 #define DX_HASH_HALF_MD4_UNSIGNED 4
1918 #define DX_HASH_TEA_UNSIGNED 5
1919
1920 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1921 const void *address, unsigned int length)
1922 {
1923 struct {
1924 struct shash_desc shash;
1925 char ctx[4];
1926 } desc;
1927 int err;
1928
1929 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1930
1931 desc.shash.tfm = sbi->s_chksum_driver;
1932 desc.shash.flags = 0;
1933 *(u32 *)desc.ctx = crc;
1934
1935 err = crypto_shash_update(&desc.shash, address, length);
1936 BUG_ON(err);
1937
1938 return *(u32 *)desc.ctx;
1939 }
1940
1941 #ifdef __KERNEL__
1942
1943 /* hash info structure used by the directory hash */
1944 struct dx_hash_info
1945 {
1946 u32 hash;
1947 u32 minor_hash;
1948 int hash_version;
1949 u32 *seed;
1950 };
1951
1952
1953 /* 32 and 64 bit signed EOF for dx directories */
1954 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1955 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1956
1957
1958 /*
1959 * Control parameters used by ext4_htree_next_block
1960 */
1961 #define HASH_NB_ALWAYS 1
1962
1963 struct ext4_filename {
1964 const struct qstr *usr_fname;
1965 struct ext4_str disk_name;
1966 struct dx_hash_info hinfo;
1967 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1968 struct ext4_str crypto_buf;
1969 #endif
1970 };
1971
1972 #define fname_name(p) ((p)->disk_name.name)
1973 #define fname_len(p) ((p)->disk_name.len)
1974
1975 /*
1976 * Describe an inode's exact location on disk and in memory
1977 */
1978 struct ext4_iloc
1979 {
1980 struct buffer_head *bh;
1981 unsigned long offset;
1982 ext4_group_t block_group;
1983 };
1984
1985 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1986 {
1987 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1988 }
1989
1990 /*
1991 * This structure is stuffed into the struct file's private_data field
1992 * for directories. It is where we put information so that we can do
1993 * readdir operations in hash tree order.
1994 */
1995 struct dir_private_info {
1996 struct rb_root root;
1997 struct rb_node *curr_node;
1998 struct fname *extra_fname;
1999 loff_t last_pos;
2000 __u32 curr_hash;
2001 __u32 curr_minor_hash;
2002 __u32 next_hash;
2003 };
2004
2005 /* calculate the first block number of the group */
2006 static inline ext4_fsblk_t
2007 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2008 {
2009 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2010 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2011 }
2012
2013 /*
2014 * Special error return code only used by dx_probe() and its callers.
2015 */
2016 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2017
2018 /*
2019 * Timeout and state flag for lazy initialization inode thread.
2020 */
2021 #define EXT4_DEF_LI_WAIT_MULT 10
2022 #define EXT4_DEF_LI_MAX_START_DELAY 5
2023 #define EXT4_LAZYINIT_QUIT 0x0001
2024 #define EXT4_LAZYINIT_RUNNING 0x0002
2025
2026 /*
2027 * Lazy inode table initialization info
2028 */
2029 struct ext4_lazy_init {
2030 unsigned long li_state;
2031 struct list_head li_request_list;
2032 struct mutex li_list_mtx;
2033 };
2034
2035 struct ext4_li_request {
2036 struct super_block *lr_super;
2037 struct ext4_sb_info *lr_sbi;
2038 ext4_group_t lr_next_group;
2039 struct list_head lr_request;
2040 unsigned long lr_next_sched;
2041 unsigned long lr_timeout;
2042 };
2043
2044 struct ext4_features {
2045 struct kobject f_kobj;
2046 struct completion f_kobj_unregister;
2047 };
2048
2049 /*
2050 * This structure will be used for multiple mount protection. It will be
2051 * written into the block number saved in the s_mmp_block field in the
2052 * superblock. Programs that check MMP should assume that if
2053 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2054 * to use the filesystem, regardless of how old the timestamp is.
2055 */
2056 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2057 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2058 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2059 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2060
2061 struct mmp_struct {
2062 __le32 mmp_magic; /* Magic number for MMP */
2063 __le32 mmp_seq; /* Sequence no. updated periodically */
2064
2065 /*
2066 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2067 * purposes and do not affect the correctness of the algorithm
2068 */
2069 __le64 mmp_time; /* Time last updated */
2070 char mmp_nodename[64]; /* Node which last updated MMP block */
2071 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2072
2073 /*
2074 * mmp_check_interval is used to verify if the MMP block has been
2075 * updated on the block device. The value is updated based on the
2076 * maximum time to write the MMP block during an update cycle.
2077 */
2078 __le16 mmp_check_interval;
2079
2080 __le16 mmp_pad1;
2081 __le32 mmp_pad2[226];
2082 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2083 };
2084
2085 /* arguments passed to the mmp thread */
2086 struct mmpd_data {
2087 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2088 struct super_block *sb; /* super block of the fs */
2089 };
2090
2091 /*
2092 * Check interval multiplier
2093 * The MMP block is written every update interval and initially checked every
2094 * update interval x the multiplier (the value is then adapted based on the
2095 * write latency). The reason is that writes can be delayed under load and we
2096 * don't want readers to incorrectly assume that the filesystem is no longer
2097 * in use.
2098 */
2099 #define EXT4_MMP_CHECK_MULT 2UL
2100
2101 /*
2102 * Minimum interval for MMP checking in seconds.
2103 */
2104 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2105
2106 /*
2107 * Maximum interval for MMP checking in seconds.
2108 */
2109 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2110
2111 /*
2112 * Function prototypes
2113 */
2114
2115 /*
2116 * Ok, these declarations are also in <linux/kernel.h> but none of the
2117 * ext4 source programs needs to include it so they are duplicated here.
2118 */
2119 # define NORET_TYPE /**/
2120 # define ATTRIB_NORET __attribute__((noreturn))
2121 # define NORET_AND noreturn,
2122
2123 /* bitmap.c */
2124 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2125 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2126 struct ext4_group_desc *gdp,
2127 struct buffer_head *bh, int sz);
2128 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2129 struct ext4_group_desc *gdp,
2130 struct buffer_head *bh, int sz);
2131 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2132 struct ext4_group_desc *gdp,
2133 struct buffer_head *bh);
2134 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2135 struct ext4_group_desc *gdp,
2136 struct buffer_head *bh);
2137
2138 /* balloc.c */
2139 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2140 ext4_fsblk_t blocknr,
2141 ext4_group_t *blockgrpp,
2142 ext4_grpblk_t *offsetp);
2143 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2144 ext4_fsblk_t block);
2145
2146 extern unsigned int ext4_block_group(struct super_block *sb,
2147 ext4_fsblk_t blocknr);
2148 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2149 ext4_fsblk_t blocknr);
2150 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2151 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2152 ext4_group_t group);
2153 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2154 ext4_fsblk_t goal,
2155 unsigned int flags,
2156 unsigned long *count,
2157 int *errp);
2158 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2159 s64 nclusters, unsigned int flags);
2160 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2161 extern void ext4_check_blocks_bitmap(struct super_block *);
2162 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2163 ext4_group_t block_group,
2164 struct buffer_head ** bh);
2165 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2166
2167 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2168 ext4_group_t block_group);
2169 extern int ext4_wait_block_bitmap(struct super_block *sb,
2170 ext4_group_t block_group,
2171 struct buffer_head *bh);
2172 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2173 ext4_group_t block_group);
2174 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2175 ext4_group_t block_group,
2176 struct ext4_group_desc *gdp);
2177 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2178
2179 /* crypto_policy.c */
2180 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2181 struct inode *child);
2182 int ext4_inherit_context(struct inode *parent, struct inode *child);
2183 void ext4_to_hex(char *dst, char *src, size_t src_size);
2184 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2185 struct inode *inode);
2186 int ext4_get_policy(struct inode *inode,
2187 struct ext4_encryption_policy *policy);
2188
2189 /* crypto.c */
2190 extern struct kmem_cache *ext4_crypt_info_cachep;
2191 bool ext4_valid_contents_enc_mode(uint32_t mode);
2192 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2193 extern struct workqueue_struct *ext4_read_workqueue;
2194 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2195 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2196 void ext4_restore_control_page(struct page *data_page);
2197 struct page *ext4_encrypt(struct inode *inode,
2198 struct page *plaintext_page);
2199 int ext4_decrypt(struct page *page);
2200 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex);
2201
2202 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2203 int ext4_init_crypto(void);
2204 void ext4_exit_crypto(void);
2205 static inline int ext4_sb_has_crypto(struct super_block *sb)
2206 {
2207 return ext4_has_feature_encrypt(sb);
2208 }
2209 #else
2210 static inline int ext4_init_crypto(void) { return 0; }
2211 static inline void ext4_exit_crypto(void) { }
2212 static inline int ext4_sb_has_crypto(struct super_block *sb)
2213 {
2214 return 0;
2215 }
2216 #endif
2217
2218 /* crypto_fname.c */
2219 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2220 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2221 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2222 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2223 u32 ilen, struct ext4_str *crypto_str);
2224 int _ext4_fname_disk_to_usr(struct inode *inode,
2225 struct dx_hash_info *hinfo,
2226 const struct ext4_str *iname,
2227 struct ext4_str *oname);
2228 int ext4_fname_disk_to_usr(struct inode *inode,
2229 struct dx_hash_info *hinfo,
2230 const struct ext4_dir_entry_2 *de,
2231 struct ext4_str *oname);
2232 int ext4_fname_usr_to_disk(struct inode *inode,
2233 const struct qstr *iname,
2234 struct ext4_str *oname);
2235 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2236 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2237 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2238 int lookup, struct ext4_filename *fname);
2239 void ext4_fname_free_filename(struct ext4_filename *fname);
2240 #else
2241 static inline
2242 int ext4_setup_fname_crypto(struct inode *inode)
2243 {
2244 return 0;
2245 }
2246 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2247 static inline int ext4_fname_setup_filename(struct inode *dir,
2248 const struct qstr *iname,
2249 int lookup, struct ext4_filename *fname)
2250 {
2251 fname->usr_fname = iname;
2252 fname->disk_name.name = (unsigned char *) iname->name;
2253 fname->disk_name.len = iname->len;
2254 return 0;
2255 }
2256 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2257 #endif
2258
2259
2260 /* crypto_key.c */
2261 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2262 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2263 int _ext4_get_encryption_info(struct inode *inode);
2264
2265 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2266 int ext4_has_encryption_key(struct inode *inode);
2267
2268 static inline int ext4_get_encryption_info(struct inode *inode)
2269 {
2270 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2271
2272 if (!ci ||
2273 (ci->ci_keyring_key &&
2274 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2275 (1 << KEY_FLAG_REVOKED) |
2276 (1 << KEY_FLAG_DEAD)))))
2277 return _ext4_get_encryption_info(inode);
2278 return 0;
2279 }
2280
2281 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2282 {
2283 return EXT4_I(inode)->i_crypt_info;
2284 }
2285
2286 #else
2287 static inline int ext4_has_encryption_key(struct inode *inode)
2288 {
2289 return 0;
2290 }
2291 static inline int ext4_get_encryption_info(struct inode *inode)
2292 {
2293 return 0;
2294 }
2295 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2296 {
2297 return NULL;
2298 }
2299 #endif
2300
2301
2302 /* dir.c */
2303 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2304 struct file *,
2305 struct ext4_dir_entry_2 *,
2306 struct buffer_head *, char *, int,
2307 unsigned int);
2308 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2309 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2310 (de), (bh), (buf), (size), (offset)))
2311 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2312 __u32 minor_hash,
2313 struct ext4_dir_entry_2 *dirent,
2314 struct ext4_str *ent_name);
2315 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2316 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2317 struct buffer_head *bh,
2318 void *buf, int buf_size,
2319 struct ext4_filename *fname,
2320 struct ext4_dir_entry_2 **dest_de);
2321 int ext4_insert_dentry(struct inode *dir,
2322 struct inode *inode,
2323 struct ext4_dir_entry_2 *de,
2324 int buf_size,
2325 struct ext4_filename *fname);
2326 static inline void ext4_update_dx_flag(struct inode *inode)
2327 {
2328 if (!ext4_has_feature_dir_index(inode->i_sb))
2329 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2330 }
2331 static unsigned char ext4_filetype_table[] = {
2332 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2333 };
2334
2335 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2336 {
2337 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2338 return DT_UNKNOWN;
2339
2340 return ext4_filetype_table[filetype];
2341 }
2342 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2343 void *buf, int buf_size);
2344
2345 /* fsync.c */
2346 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2347
2348 /* hash.c */
2349 extern int ext4fs_dirhash(const char *name, int len, struct
2350 dx_hash_info *hinfo);
2351
2352 /* ialloc.c */
2353 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2354 const struct qstr *qstr, __u32 goal,
2355 uid_t *owner, int handle_type,
2356 unsigned int line_no, int nblocks);
2357
2358 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2359 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2360 0, 0, 0)
2361 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2362 type, nblocks) \
2363 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2364 (type), __LINE__, (nblocks))
2365
2366
2367 extern void ext4_free_inode(handle_t *, struct inode *);
2368 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2369 extern unsigned long ext4_count_free_inodes(struct super_block *);
2370 extern unsigned long ext4_count_dirs(struct super_block *);
2371 extern void ext4_check_inodes_bitmap(struct super_block *);
2372 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2373 extern int ext4_init_inode_table(struct super_block *sb,
2374 ext4_group_t group, int barrier);
2375 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2376
2377 /* mballoc.c */
2378 extern const struct file_operations ext4_seq_mb_groups_fops;
2379 extern long ext4_mb_stats;
2380 extern long ext4_mb_max_to_scan;
2381 extern int ext4_mb_init(struct super_block *);
2382 extern int ext4_mb_release(struct super_block *);
2383 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2384 struct ext4_allocation_request *, int *);
2385 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2386 extern void ext4_discard_preallocations(struct inode *);
2387 extern int __init ext4_init_mballoc(void);
2388 extern void ext4_exit_mballoc(void);
2389 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2390 struct buffer_head *bh, ext4_fsblk_t block,
2391 unsigned long count, int flags);
2392 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2393 ext4_group_t ngroups);
2394 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2395 ext4_group_t i, struct ext4_group_desc *desc);
2396 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2397 ext4_fsblk_t block, unsigned long count);
2398 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2399
2400 /* inode.c */
2401 int ext4_inode_is_fast_symlink(struct inode *inode);
2402 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2403 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2404 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2405 struct buffer_head *bh_result, int create);
2406 int ext4_get_block_dax(struct inode *inode, sector_t iblock,
2407 struct buffer_head *bh_result, int create);
2408 int ext4_get_block(struct inode *inode, sector_t iblock,
2409 struct buffer_head *bh_result, int create);
2410 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2411 struct buffer_head *bh, int create);
2412 int ext4_walk_page_buffers(handle_t *handle,
2413 struct buffer_head *head,
2414 unsigned from,
2415 unsigned to,
2416 int *partial,
2417 int (*fn)(handle_t *handle,
2418 struct buffer_head *bh));
2419 int do_journal_get_write_access(handle_t *handle,
2420 struct buffer_head *bh);
2421 #define FALL_BACK_TO_NONDELALLOC 1
2422 #define CONVERT_INLINE_DATA 2
2423
2424 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2425 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2426 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2427 extern int ext4_setattr(struct dentry *, struct iattr *);
2428 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2429 struct kstat *stat);
2430 extern void ext4_evict_inode(struct inode *);
2431 extern void ext4_clear_inode(struct inode *);
2432 extern int ext4_sync_inode(handle_t *, struct inode *);
2433 extern void ext4_dirty_inode(struct inode *, int);
2434 extern int ext4_change_inode_journal_flag(struct inode *, int);
2435 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2436 extern int ext4_inode_attach_jinode(struct inode *inode);
2437 extern int ext4_can_truncate(struct inode *inode);
2438 extern void ext4_truncate(struct inode *);
2439 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2440 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2441 extern void ext4_set_inode_flags(struct inode *);
2442 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2443 extern int ext4_alloc_da_blocks(struct inode *inode);
2444 extern void ext4_set_aops(struct inode *inode);
2445 extern int ext4_writepage_trans_blocks(struct inode *);
2446 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2447 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2448 loff_t lstart, loff_t lend);
2449 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2450 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2451 extern void ext4_da_update_reserve_space(struct inode *inode,
2452 int used, int quota_claim);
2453
2454 /* indirect.c */
2455 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2456 struct ext4_map_blocks *map, int flags);
2457 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2458 loff_t offset);
2459 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2460 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2461 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2462 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2463 ext4_lblk_t start, ext4_lblk_t end);
2464
2465 /* ioctl.c */
2466 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2467 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2468
2469 /* migrate.c */
2470 extern int ext4_ext_migrate(struct inode *);
2471 extern int ext4_ind_migrate(struct inode *inode);
2472
2473 /* namei.c */
2474 extern int ext4_dirent_csum_verify(struct inode *inode,
2475 struct ext4_dir_entry *dirent);
2476 extern int ext4_orphan_add(handle_t *, struct inode *);
2477 extern int ext4_orphan_del(handle_t *, struct inode *);
2478 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2479 __u32 start_minor_hash, __u32 *next_hash);
2480 extern int ext4_search_dir(struct buffer_head *bh,
2481 char *search_buf,
2482 int buf_size,
2483 struct inode *dir,
2484 struct ext4_filename *fname,
2485 const struct qstr *d_name,
2486 unsigned int offset,
2487 struct ext4_dir_entry_2 **res_dir);
2488 extern int ext4_generic_delete_entry(handle_t *handle,
2489 struct inode *dir,
2490 struct ext4_dir_entry_2 *de_del,
2491 struct buffer_head *bh,
2492 void *entry_buf,
2493 int buf_size,
2494 int csum_size);
2495 extern int ext4_empty_dir(struct inode *inode);
2496
2497 /* resize.c */
2498 extern int ext4_group_add(struct super_block *sb,
2499 struct ext4_new_group_data *input);
2500 extern int ext4_group_extend(struct super_block *sb,
2501 struct ext4_super_block *es,
2502 ext4_fsblk_t n_blocks_count);
2503 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2504
2505 /* super.c */
2506 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2507 extern int ext4_calculate_overhead(struct super_block *sb);
2508 extern void ext4_superblock_csum_set(struct super_block *sb);
2509 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2510 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2511 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2512 ext4_group_t ngroup);
2513 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2514 char nbuf[16]);
2515
2516 extern __printf(4, 5)
2517 void __ext4_error(struct super_block *, const char *, unsigned int,
2518 const char *, ...);
2519 extern __printf(5, 6)
2520 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2521 const char *, ...);
2522 extern __printf(5, 6)
2523 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2524 const char *, ...);
2525 extern void __ext4_std_error(struct super_block *, const char *,
2526 unsigned int, int);
2527 extern __printf(4, 5)
2528 void __ext4_abort(struct super_block *, const char *, unsigned int,
2529 const char *, ...);
2530 extern __printf(4, 5)
2531 void __ext4_warning(struct super_block *, const char *, unsigned int,
2532 const char *, ...);
2533 extern __printf(4, 5)
2534 void __ext4_warning_inode(const struct inode *inode, const char *function,
2535 unsigned int line, const char *fmt, ...);
2536 extern __printf(3, 4)
2537 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2538 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2539 const char *, unsigned int, const char *);
2540 extern __printf(7, 8)
2541 void __ext4_grp_locked_error(const char *, unsigned int,
2542 struct super_block *, ext4_group_t,
2543 unsigned long, ext4_fsblk_t,
2544 const char *, ...);
2545
2546 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2547 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2548
2549 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
2550 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2551
2552 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
2553 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2554
2555 #ifdef CONFIG_PRINTK
2556
2557 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2558 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2559 #define ext4_error_file(file, func, line, block, fmt, ...) \
2560 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2561 #define ext4_error(sb, fmt, ...) \
2562 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2563 #define ext4_abort(sb, fmt, ...) \
2564 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2565 #define ext4_warning(sb, fmt, ...) \
2566 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2567 #define ext4_warning_inode(inode, fmt, ...) \
2568 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2569 #define ext4_msg(sb, level, fmt, ...) \
2570 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2571 #define dump_mmp_msg(sb, mmp, msg) \
2572 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2573 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2574 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2575 fmt, ##__VA_ARGS__)
2576
2577 #else
2578
2579 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2580 do { \
2581 no_printk(fmt, ##__VA_ARGS__); \
2582 __ext4_error_inode(inode, "", 0, block, " "); \
2583 } while (0)
2584 #define ext4_error_file(file, func, line, block, fmt, ...) \
2585 do { \
2586 no_printk(fmt, ##__VA_ARGS__); \
2587 __ext4_error_file(file, "", 0, block, " "); \
2588 } while (0)
2589 #define ext4_error(sb, fmt, ...) \
2590 do { \
2591 no_printk(fmt, ##__VA_ARGS__); \
2592 __ext4_error(sb, "", 0, " "); \
2593 } while (0)
2594 #define ext4_abort(sb, fmt, ...) \
2595 do { \
2596 no_printk(fmt, ##__VA_ARGS__); \
2597 __ext4_abort(sb, "", 0, " "); \
2598 } while (0)
2599 #define ext4_warning(sb, fmt, ...) \
2600 do { \
2601 no_printk(fmt, ##__VA_ARGS__); \
2602 __ext4_warning(sb, "", 0, " "); \
2603 } while (0)
2604 #define ext4_warning_inode(inode, fmt, ...) \
2605 do { \
2606 no_printk(fmt, ##__VA_ARGS__); \
2607 __ext4_warning_inode(inode, "", 0, " "); \
2608 } while (0)
2609 #define ext4_msg(sb, level, fmt, ...) \
2610 do { \
2611 no_printk(fmt, ##__VA_ARGS__); \
2612 __ext4_msg(sb, "", " "); \
2613 } while (0)
2614 #define dump_mmp_msg(sb, mmp, msg) \
2615 __dump_mmp_msg(sb, mmp, "", 0, "")
2616 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2617 do { \
2618 no_printk(fmt, ##__VA_ARGS__); \
2619 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2620 } while (0)
2621
2622 #endif
2623
2624 extern void ext4_update_dynamic_rev(struct super_block *sb);
2625 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2626 __u32 compat);
2627 extern int ext4_update_rocompat_feature(handle_t *handle,
2628 struct super_block *sb, __u32 rocompat);
2629 extern int ext4_update_incompat_feature(handle_t *handle,
2630 struct super_block *sb, __u32 incompat);
2631 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2632 struct ext4_group_desc *bg);
2633 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2634 struct ext4_group_desc *bg);
2635 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2636 struct ext4_group_desc *bg);
2637 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2638 struct ext4_group_desc *bg);
2639 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2640 struct ext4_group_desc *bg);
2641 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2642 struct ext4_group_desc *bg);
2643 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2644 struct ext4_group_desc *bg);
2645 extern void ext4_block_bitmap_set(struct super_block *sb,
2646 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2647 extern void ext4_inode_bitmap_set(struct super_block *sb,
2648 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2649 extern void ext4_inode_table_set(struct super_block *sb,
2650 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2651 extern void ext4_free_group_clusters_set(struct super_block *sb,
2652 struct ext4_group_desc *bg,
2653 __u32 count);
2654 extern void ext4_free_inodes_set(struct super_block *sb,
2655 struct ext4_group_desc *bg, __u32 count);
2656 extern void ext4_used_dirs_set(struct super_block *sb,
2657 struct ext4_group_desc *bg, __u32 count);
2658 extern void ext4_itable_unused_set(struct super_block *sb,
2659 struct ext4_group_desc *bg, __u32 count);
2660 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2661 struct ext4_group_desc *gdp);
2662 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2663 struct ext4_group_desc *gdp);
2664 extern int ext4_register_li_request(struct super_block *sb,
2665 ext4_group_t first_not_zeroed);
2666
2667 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2668 {
2669 return ext4_has_feature_gdt_csum(sb) ||
2670 EXT4_SB(sb)->s_chksum_driver != NULL;
2671 }
2672
2673 static inline int ext4_has_metadata_csum(struct super_block *sb)
2674 {
2675 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
2676 !EXT4_SB(sb)->s_chksum_driver);
2677
2678 return (EXT4_SB(sb)->s_chksum_driver != NULL);
2679 }
2680 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2681 {
2682 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2683 le32_to_cpu(es->s_blocks_count_lo);
2684 }
2685
2686 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2687 {
2688 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2689 le32_to_cpu(es->s_r_blocks_count_lo);
2690 }
2691
2692 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2693 {
2694 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2695 le32_to_cpu(es->s_free_blocks_count_lo);
2696 }
2697
2698 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2699 ext4_fsblk_t blk)
2700 {
2701 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2702 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2703 }
2704
2705 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2706 ext4_fsblk_t blk)
2707 {
2708 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2709 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2710 }
2711
2712 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2713 ext4_fsblk_t blk)
2714 {
2715 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2716 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2717 }
2718
2719 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2720 {
2721 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2722 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2723 le32_to_cpu(raw_inode->i_size_lo);
2724 else
2725 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2726 }
2727
2728 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2729 {
2730 raw_inode->i_size_lo = cpu_to_le32(i_size);
2731 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2732 }
2733
2734 static inline
2735 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2736 ext4_group_t group)
2737 {
2738 struct ext4_group_info ***grp_info;
2739 long indexv, indexh;
2740 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2741 grp_info = EXT4_SB(sb)->s_group_info;
2742 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2743 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2744 return grp_info[indexv][indexh];
2745 }
2746
2747 /*
2748 * Reading s_groups_count requires using smp_rmb() afterwards. See
2749 * the locking protocol documented in the comments of ext4_group_add()
2750 * in resize.c
2751 */
2752 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2753 {
2754 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2755
2756 smp_rmb();
2757 return ngroups;
2758 }
2759
2760 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2761 ext4_group_t block_group)
2762 {
2763 return block_group >> sbi->s_log_groups_per_flex;
2764 }
2765
2766 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2767 {
2768 return 1 << sbi->s_log_groups_per_flex;
2769 }
2770
2771 #define ext4_std_error(sb, errno) \
2772 do { \
2773 if ((errno)) \
2774 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2775 } while (0)
2776
2777 #ifdef CONFIG_SMP
2778 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2779 * counters. So we need to make sure we have free clusters more
2780 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2781 */
2782 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2783 #else
2784 #define EXT4_FREECLUSTERS_WATERMARK 0
2785 #endif
2786
2787 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2788 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2789 {
2790 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2791 !mutex_is_locked(&inode->i_mutex));
2792 down_write(&EXT4_I(inode)->i_data_sem);
2793 if (newsize > EXT4_I(inode)->i_disksize)
2794 EXT4_I(inode)->i_disksize = newsize;
2795 up_write(&EXT4_I(inode)->i_data_sem);
2796 }
2797
2798 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2799 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2800 {
2801 int changed = 0;
2802
2803 if (newsize > inode->i_size) {
2804 i_size_write(inode, newsize);
2805 changed = 1;
2806 }
2807 if (newsize > EXT4_I(inode)->i_disksize) {
2808 ext4_update_i_disksize(inode, newsize);
2809 changed |= 2;
2810 }
2811 return changed;
2812 }
2813
2814 struct ext4_group_info {
2815 unsigned long bb_state;
2816 struct rb_root bb_free_root;
2817 ext4_grpblk_t bb_first_free; /* first free block */
2818 ext4_grpblk_t bb_free; /* total free blocks */
2819 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2820 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2821 struct list_head bb_prealloc_list;
2822 #ifdef DOUBLE_CHECK
2823 void *bb_bitmap;
2824 #endif
2825 struct rw_semaphore alloc_sem;
2826 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2827 * regions, index is order.
2828 * bb_counters[3] = 5 means
2829 * 5 free 8-block regions. */
2830 };
2831
2832 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2833 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2834 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2835 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2836
2837 #define EXT4_MB_GRP_NEED_INIT(grp) \
2838 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2839 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2840 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2841 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2842 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2843
2844 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2845 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2846 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2847 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2848 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2849 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2850
2851 #define EXT4_MAX_CONTENTION 8
2852 #define EXT4_CONTENTION_THRESHOLD 2
2853
2854 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2855 ext4_group_t group)
2856 {
2857 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2858 }
2859
2860 /*
2861 * Returns true if the filesystem is busy enough that attempts to
2862 * access the block group locks has run into contention.
2863 */
2864 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2865 {
2866 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2867 }
2868
2869 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2870 {
2871 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2872 if (spin_trylock(lock))
2873 /*
2874 * We're able to grab the lock right away, so drop the
2875 * lock contention counter.
2876 */
2877 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2878 else {
2879 /*
2880 * The lock is busy, so bump the contention counter,
2881 * and then wait on the spin lock.
2882 */
2883 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2884 EXT4_MAX_CONTENTION);
2885 spin_lock(lock);
2886 }
2887 }
2888
2889 static inline void ext4_unlock_group(struct super_block *sb,
2890 ext4_group_t group)
2891 {
2892 spin_unlock(ext4_group_lock_ptr(sb, group));
2893 }
2894
2895 /*
2896 * Block validity checking
2897 */
2898 #define ext4_check_indirect_blockref(inode, bh) \
2899 ext4_check_blockref(__func__, __LINE__, inode, \
2900 (__le32 *)(bh)->b_data, \
2901 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2902
2903 #define ext4_ind_check_inode(inode) \
2904 ext4_check_blockref(__func__, __LINE__, inode, \
2905 EXT4_I(inode)->i_data, \
2906 EXT4_NDIR_BLOCKS)
2907
2908 /*
2909 * Inodes and files operations
2910 */
2911
2912 /* dir.c */
2913 extern const struct file_operations ext4_dir_operations;
2914
2915 /* file.c */
2916 extern const struct inode_operations ext4_file_inode_operations;
2917 extern const struct file_operations ext4_file_operations;
2918 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2919
2920 /* inline.c */
2921 extern int ext4_get_max_inline_size(struct inode *inode);
2922 extern int ext4_find_inline_data_nolock(struct inode *inode);
2923 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2924 unsigned int len);
2925 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2926
2927 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2928 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2929 struct inode *inode,
2930 loff_t pos, unsigned len,
2931 unsigned flags,
2932 struct page **pagep);
2933 extern int ext4_write_inline_data_end(struct inode *inode,
2934 loff_t pos, unsigned len,
2935 unsigned copied,
2936 struct page *page);
2937 extern struct buffer_head *
2938 ext4_journalled_write_inline_data(struct inode *inode,
2939 unsigned len,
2940 struct page *page);
2941 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2942 struct inode *inode,
2943 loff_t pos, unsigned len,
2944 unsigned flags,
2945 struct page **pagep,
2946 void **fsdata);
2947 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2948 unsigned len, unsigned copied,
2949 struct page *page);
2950 extern int ext4_try_add_inline_entry(handle_t *handle,
2951 struct ext4_filename *fname,
2952 struct dentry *dentry,
2953 struct inode *inode);
2954 extern int ext4_try_create_inline_dir(handle_t *handle,
2955 struct inode *parent,
2956 struct inode *inode);
2957 extern int ext4_read_inline_dir(struct file *filp,
2958 struct dir_context *ctx,
2959 int *has_inline_data);
2960 extern int htree_inlinedir_to_tree(struct file *dir_file,
2961 struct inode *dir, ext4_lblk_t block,
2962 struct dx_hash_info *hinfo,
2963 __u32 start_hash, __u32 start_minor_hash,
2964 int *has_inline_data);
2965 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2966 struct ext4_filename *fname,
2967 const struct qstr *d_name,
2968 struct ext4_dir_entry_2 **res_dir,
2969 int *has_inline_data);
2970 extern int ext4_delete_inline_entry(handle_t *handle,
2971 struct inode *dir,
2972 struct ext4_dir_entry_2 *de_del,
2973 struct buffer_head *bh,
2974 int *has_inline_data);
2975 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2976 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2977 struct ext4_dir_entry_2 **parent_de,
2978 int *retval);
2979 extern int ext4_inline_data_fiemap(struct inode *inode,
2980 struct fiemap_extent_info *fieinfo,
2981 int *has_inline, __u64 start, __u64 len);
2982 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2983 struct inode *inode,
2984 int needed);
2985 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2986
2987 extern int ext4_convert_inline_data(struct inode *inode);
2988
2989 static inline int ext4_has_inline_data(struct inode *inode)
2990 {
2991 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2992 EXT4_I(inode)->i_inline_off;
2993 }
2994
2995 /* namei.c */
2996 extern const struct inode_operations ext4_dir_inode_operations;
2997 extern const struct inode_operations ext4_special_inode_operations;
2998 extern struct dentry *ext4_get_parent(struct dentry *child);
2999 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3000 struct ext4_dir_entry_2 *de,
3001 int blocksize, int csum_size,
3002 unsigned int parent_ino, int dotdot_real_len);
3003 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
3004 unsigned int blocksize);
3005 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
3006 struct inode *inode,
3007 struct buffer_head *bh);
3008 #define S_SHIFT 12
3009 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
3010 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3011 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3012 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3013 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3014 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3015 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3016 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3017 };
3018
3019 static inline void ext4_set_de_type(struct super_block *sb,
3020 struct ext4_dir_entry_2 *de,
3021 umode_t mode) {
3022 if (ext4_has_feature_filetype(sb))
3023 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3024 }
3025
3026 /* readpages.c */
3027 extern int ext4_mpage_readpages(struct address_space *mapping,
3028 struct list_head *pages, struct page *page,
3029 unsigned nr_pages);
3030
3031 /* symlink.c */
3032 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3033 extern const struct inode_operations ext4_symlink_inode_operations;
3034 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3035
3036 /* sysfs.c */
3037 extern int ext4_register_sysfs(struct super_block *sb);
3038 extern void ext4_unregister_sysfs(struct super_block *sb);
3039 extern int __init ext4_init_sysfs(void);
3040 extern void ext4_exit_sysfs(void);
3041
3042 /* block_validity */
3043 extern void ext4_release_system_zone(struct super_block *sb);
3044 extern int ext4_setup_system_zone(struct super_block *sb);
3045 extern int __init ext4_init_system_zone(void);
3046 extern void ext4_exit_system_zone(void);
3047 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
3048 ext4_fsblk_t start_blk,
3049 unsigned int count);
3050 extern int ext4_check_blockref(const char *, unsigned int,
3051 struct inode *, __le32 *, unsigned int);
3052
3053 /* extents.c */
3054 struct ext4_ext_path;
3055 struct ext4_extent;
3056
3057 /*
3058 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3059 * __le32.
3060 */
3061 #define EXT_MAX_BLOCKS 0xffffffff
3062
3063 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
3064 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
3065 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3066 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3067 struct ext4_map_blocks *map, int flags);
3068 extern void ext4_ext_truncate(handle_t *, struct inode *);
3069 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3070 ext4_lblk_t end);
3071 extern void ext4_ext_init(struct super_block *);
3072 extern void ext4_ext_release(struct super_block *);
3073 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3074 loff_t len);
3075 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3076 loff_t offset, ssize_t len);
3077 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3078 struct ext4_map_blocks *map, int flags);
3079 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
3080 ext4_lblk_t lblocks);
3081 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3082 int num,
3083 struct ext4_ext_path *path);
3084 extern int ext4_can_extents_be_merged(struct inode *inode,
3085 struct ext4_extent *ex1,
3086 struct ext4_extent *ex2);
3087 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3088 struct ext4_ext_path **,
3089 struct ext4_extent *, int);
3090 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3091 struct ext4_ext_path **,
3092 int flags);
3093 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3094 extern int ext4_ext_check_inode(struct inode *inode);
3095 extern int ext4_find_delalloc_range(struct inode *inode,
3096 ext4_lblk_t lblk_start,
3097 ext4_lblk_t lblk_end);
3098 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
3099 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3100 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3101 __u64 start, __u64 len);
3102 extern int ext4_ext_precache(struct inode *inode);
3103 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
3104 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
3105 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3106 struct inode *inode2, ext4_lblk_t lblk1,
3107 ext4_lblk_t lblk2, ext4_lblk_t count,
3108 int mark_unwritten,int *err);
3109
3110 /* move_extent.c */
3111 extern void ext4_double_down_write_data_sem(struct inode *first,
3112 struct inode *second);
3113 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3114 struct inode *donor_inode);
3115 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3116 __u64 start_orig, __u64 start_donor,
3117 __u64 len, __u64 *moved_len);
3118
3119 /* page-io.c */
3120 extern int __init ext4_init_pageio(void);
3121 extern void ext4_exit_pageio(void);
3122 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3123 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3124 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3125 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3126 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3127 struct writeback_control *wbc);
3128 extern void ext4_end_io_rsv_work(struct work_struct *work);
3129 extern void ext4_io_submit(struct ext4_io_submit *io);
3130 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3131 struct page *page,
3132 int len,
3133 struct writeback_control *wbc,
3134 bool keep_towrite);
3135
3136 /* mmp.c */
3137 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3138
3139 /*
3140 * Add new method to test whether block and inode bitmaps are properly
3141 * initialized. With uninit_bg reading the block from disk is not enough
3142 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3143 */
3144 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3145
3146 static inline int bitmap_uptodate(struct buffer_head *bh)
3147 {
3148 return (buffer_uptodate(bh) &&
3149 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3150 }
3151 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3152 {
3153 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3154 }
3155
3156 /*
3157 * Disable DIO read nolock optimization, so new dioreaders will be forced
3158 * to grab i_mutex
3159 */
3160 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3161 {
3162 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3163 smp_mb();
3164 }
3165 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3166 {
3167 smp_mb();
3168 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3169 }
3170
3171 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3172
3173 /* For ioend & aio unwritten conversion wait queues */
3174 #define EXT4_WQ_HASH_SZ 37
3175 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3176 EXT4_WQ_HASH_SZ])
3177 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
3178 EXT4_WQ_HASH_SZ])
3179 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3180 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
3181
3182 #define EXT4_RESIZING 0
3183 extern int ext4_resize_begin(struct super_block *sb);
3184 extern void ext4_resize_end(struct super_block *sb);
3185
3186 #endif /* __KERNEL__ */
3187
3188 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3189 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3190
3191 #endif /* _EXT4_H */
Linux kernel - Deliverables
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