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Merge tag 'fcoe' into fixes
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / ext4.h
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <crypto/hash.h>
33 #ifdef __KERNEL__
34 #include <linux/compat.h>
35 #endif
36
37 /*
38 * The fourth extended filesystem constants/structures
39 */
40
41 /*
42 * Define EXT4FS_DEBUG to produce debug messages
43 */
44 #undef EXT4FS_DEBUG
45
46 /*
47 * Debug code
48 */
49 #ifdef EXT4FS_DEBUG
50 #define ext4_debug(f, a...) \
51 do { \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
55 } while (0)
56 #else
57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
58 #endif
59
60 /*
61 * Turn on EXT_DEBUG to get lots of info about extents operations.
62 */
63 #define EXT_DEBUG__
64 #ifdef EXT_DEBUG
65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
66 #else
67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
68 #endif
69
70 #define EXT4_ERROR_INODE(inode, fmt, a...) \
71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
72
73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
75
76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
78
79 /* data type for block offset of block group */
80 typedef int ext4_grpblk_t;
81
82 /* data type for filesystem-wide blocks number */
83 typedef unsigned long long ext4_fsblk_t;
84
85 /* data type for file logical block number */
86 typedef __u32 ext4_lblk_t;
87
88 /* data type for block group number */
89 typedef unsigned int ext4_group_t;
90
91 /*
92 * Flags used in mballoc's allocation_context flags field.
93 *
94 * Also used to show what's going on for debugging purposes when the
95 * flag field is exported via the traceport interface
96 */
97
98 /* prefer goal again. length */
99 #define EXT4_MB_HINT_MERGE 0x0001
100 /* blocks already reserved */
101 #define EXT4_MB_HINT_RESERVED 0x0002
102 /* metadata is being allocated */
103 #define EXT4_MB_HINT_METADATA 0x0004
104 /* first blocks in the file */
105 #define EXT4_MB_HINT_FIRST 0x0008
106 /* search for the best chunk */
107 #define EXT4_MB_HINT_BEST 0x0010
108 /* data is being allocated */
109 #define EXT4_MB_HINT_DATA 0x0020
110 /* don't preallocate (for tails) */
111 #define EXT4_MB_HINT_NOPREALLOC 0x0040
112 /* allocate for locality group */
113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
114 /* allocate goal blocks or none */
115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
116 /* goal is meaningful */
117 #define EXT4_MB_HINT_TRY_GOAL 0x0200
118 /* blocks already pre-reserved by delayed allocation */
119 #define EXT4_MB_DELALLOC_RESERVED 0x0400
120 /* We are doing stream allocation */
121 #define EXT4_MB_STREAM_ALLOC 0x0800
122 /* Use reserved root blocks if needed */
123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
124 /* Use blocks from reserved pool */
125 #define EXT4_MB_USE_RESERVED 0x2000
126
127 struct ext4_allocation_request {
128 /* target inode for block we're allocating */
129 struct inode *inode;
130 /* how many blocks we want to allocate */
131 unsigned int len;
132 /* logical block in target inode */
133 ext4_lblk_t logical;
134 /* the closest logical allocated block to the left */
135 ext4_lblk_t lleft;
136 /* the closest logical allocated block to the right */
137 ext4_lblk_t lright;
138 /* phys. target (a hint) */
139 ext4_fsblk_t goal;
140 /* phys. block for the closest logical allocated block to the left */
141 ext4_fsblk_t pleft;
142 /* phys. block for the closest logical allocated block to the right */
143 ext4_fsblk_t pright;
144 /* flags. see above EXT4_MB_HINT_* */
145 unsigned int flags;
146 };
147
148 /*
149 * Logical to physical block mapping, used by ext4_map_blocks()
150 *
151 * This structure is used to pass requests into ext4_map_blocks() as
152 * well as to store the information returned by ext4_map_blocks(). It
153 * takes less room on the stack than a struct buffer_head.
154 */
155 #define EXT4_MAP_NEW (1 << BH_New)
156 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
157 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
158 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
159 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
160 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
161 * ext4_map_blocks wants to know whether or not the underlying cluster has
162 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
163 * the requested mapping was from previously mapped (or delayed allocated)
164 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
165 * should never appear on buffer_head's state flags.
166 */
167 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
168 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
169 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
170 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
171
172 struct ext4_map_blocks {
173 ext4_fsblk_t m_pblk;
174 ext4_lblk_t m_lblk;
175 unsigned int m_len;
176 unsigned int m_flags;
177 };
178
179 /*
180 * For delayed allocation tracking
181 */
182 struct mpage_da_data {
183 struct inode *inode;
184 sector_t b_blocknr; /* start block number of extent */
185 size_t b_size; /* size of extent */
186 unsigned long b_state; /* state of the extent */
187 unsigned long first_page, next_page; /* extent of pages */
188 struct writeback_control *wbc;
189 int io_done;
190 int pages_written;
191 int retval;
192 };
193
194 /*
195 * Flags for ext4_io_end->flags
196 */
197 #define EXT4_IO_END_UNWRITTEN 0x0001
198 #define EXT4_IO_END_ERROR 0x0002
199 #define EXT4_IO_END_DIRECT 0x0004
200
201 /*
202 * For converting uninitialized extents on a work queue.
203 */
204 typedef struct ext4_io_end {
205 struct list_head list; /* per-file finished IO list */
206 struct inode *inode; /* file being written to */
207 unsigned int flag; /* unwritten or not */
208 loff_t offset; /* offset in the file */
209 ssize_t size; /* size of the extent */
210 struct kiocb *iocb; /* iocb struct for AIO */
211 int result; /* error value for AIO */
212 atomic_t count; /* reference counter */
213 } ext4_io_end_t;
214
215 struct ext4_io_submit {
216 int io_op;
217 struct bio *io_bio;
218 ext4_io_end_t *io_end;
219 sector_t io_next_block;
220 };
221
222 /*
223 * Special inodes numbers
224 */
225 #define EXT4_BAD_INO 1 /* Bad blocks inode */
226 #define EXT4_ROOT_INO 2 /* Root inode */
227 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
228 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
229 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
230 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
231 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
232 #define EXT4_JOURNAL_INO 8 /* Journal inode */
233
234 /* First non-reserved inode for old ext4 filesystems */
235 #define EXT4_GOOD_OLD_FIRST_INO 11
236
237 /*
238 * Maximal count of links to a file
239 */
240 #define EXT4_LINK_MAX 65000
241
242 /*
243 * Macro-instructions used to manage several block sizes
244 */
245 #define EXT4_MIN_BLOCK_SIZE 1024
246 #define EXT4_MAX_BLOCK_SIZE 65536
247 #define EXT4_MIN_BLOCK_LOG_SIZE 10
248 #define EXT4_MAX_BLOCK_LOG_SIZE 16
249 #ifdef __KERNEL__
250 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
251 #else
252 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
253 #endif
254 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
255 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
256 EXT4_SB(s)->s_cluster_bits)
257 #ifdef __KERNEL__
258 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
259 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
260 #else
261 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
262 #endif
263 #ifdef __KERNEL__
264 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
265 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
266 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
267 #else
268 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
269 EXT4_GOOD_OLD_INODE_SIZE : \
270 (s)->s_inode_size)
271 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
272 EXT4_GOOD_OLD_FIRST_INO : \
273 (s)->s_first_ino)
274 #endif
275 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
276
277 /* Translate a block number to a cluster number */
278 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
279 /* Translate a cluster number to a block number */
280 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
281 /* Translate # of blks to # of clusters */
282 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
283 (sbi)->s_cluster_bits)
284
285 /*
286 * Structure of a blocks group descriptor
287 */
288 struct ext4_group_desc
289 {
290 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
291 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
292 __le32 bg_inode_table_lo; /* Inodes table block */
293 __le16 bg_free_blocks_count_lo;/* Free blocks count */
294 __le16 bg_free_inodes_count_lo;/* Free inodes count */
295 __le16 bg_used_dirs_count_lo; /* Directories count */
296 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
297 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
298 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
299 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
300 __le16 bg_itable_unused_lo; /* Unused inodes count */
301 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
302 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
303 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
304 __le32 bg_inode_table_hi; /* Inodes table block MSB */
305 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
306 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
307 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
308 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
309 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
310 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
311 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
312 __u32 bg_reserved;
313 };
314
315 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
316 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
317 sizeof(__le16))
318 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
319 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
320 sizeof(__le16))
321
322 /*
323 * Structure of a flex block group info
324 */
325
326 struct flex_groups {
327 atomic64_t free_clusters;
328 atomic_t free_inodes;
329 atomic_t used_dirs;
330 };
331
332 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
333 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
334 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
335
336 /*
337 * Macro-instructions used to manage group descriptors
338 */
339 #define EXT4_MIN_DESC_SIZE 32
340 #define EXT4_MIN_DESC_SIZE_64BIT 64
341 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
342 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
343 #ifdef __KERNEL__
344 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
345 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
346 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
347 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
348 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
349 #else
350 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
351 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
352 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
353 #endif
354
355 /*
356 * Constants relative to the data blocks
357 */
358 #define EXT4_NDIR_BLOCKS 12
359 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
360 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
361 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
362 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
363
364 /*
365 * Inode flags
366 */
367 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
368 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
369 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
370 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
371 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
372 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
373 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
374 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
375 /* Reserved for compression usage... */
376 #define EXT4_DIRTY_FL 0x00000100
377 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
378 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
379 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
380 /* End compression flags --- maybe not all used */
381 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
382 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
383 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
384 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
385 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
386 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
387 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
388 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
389 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
390 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
391 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
392 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
393
394 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
395 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
396
397 /* Flags that should be inherited by new inodes from their parent. */
398 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
399 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
400 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
401 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
402
403 /* Flags that are appropriate for regular files (all but dir-specific ones). */
404 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
405
406 /* Flags that are appropriate for non-directories/regular files. */
407 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
408
409 /* Mask out flags that are inappropriate for the given type of inode. */
410 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
411 {
412 if (S_ISDIR(mode))
413 return flags;
414 else if (S_ISREG(mode))
415 return flags & EXT4_REG_FLMASK;
416 else
417 return flags & EXT4_OTHER_FLMASK;
418 }
419
420 /*
421 * Inode flags used for atomic set/get
422 */
423 enum {
424 EXT4_INODE_SECRM = 0, /* Secure deletion */
425 EXT4_INODE_UNRM = 1, /* Undelete */
426 EXT4_INODE_COMPR = 2, /* Compress file */
427 EXT4_INODE_SYNC = 3, /* Synchronous updates */
428 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
429 EXT4_INODE_APPEND = 5, /* writes to file may only append */
430 EXT4_INODE_NODUMP = 6, /* do not dump file */
431 EXT4_INODE_NOATIME = 7, /* do not update atime */
432 /* Reserved for compression usage... */
433 EXT4_INODE_DIRTY = 8,
434 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
435 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
436 EXT4_INODE_ECOMPR = 11, /* Compression error */
437 /* End compression flags --- maybe not all used */
438 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
439 EXT4_INODE_IMAGIC = 13, /* AFS directory */
440 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
441 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
442 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
443 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
444 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
445 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
446 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
447 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
448 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
449 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
450 };
451
452 /*
453 * Since it's pretty easy to mix up bit numbers and hex values, we use a
454 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
455 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
456 * any extra space in the compiled kernel image, otherwise, the build will fail.
457 * It's important that these values are the same, since we are using
458 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
459 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
460 * values found in ext2, ext3 and ext4 filesystems, and of course the values
461 * defined in e2fsprogs.
462 *
463 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
464 */
465 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
466 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
467
468 static inline void ext4_check_flag_values(void)
469 {
470 CHECK_FLAG_VALUE(SECRM);
471 CHECK_FLAG_VALUE(UNRM);
472 CHECK_FLAG_VALUE(COMPR);
473 CHECK_FLAG_VALUE(SYNC);
474 CHECK_FLAG_VALUE(IMMUTABLE);
475 CHECK_FLAG_VALUE(APPEND);
476 CHECK_FLAG_VALUE(NODUMP);
477 CHECK_FLAG_VALUE(NOATIME);
478 CHECK_FLAG_VALUE(DIRTY);
479 CHECK_FLAG_VALUE(COMPRBLK);
480 CHECK_FLAG_VALUE(NOCOMPR);
481 CHECK_FLAG_VALUE(ECOMPR);
482 CHECK_FLAG_VALUE(INDEX);
483 CHECK_FLAG_VALUE(IMAGIC);
484 CHECK_FLAG_VALUE(JOURNAL_DATA);
485 CHECK_FLAG_VALUE(NOTAIL);
486 CHECK_FLAG_VALUE(DIRSYNC);
487 CHECK_FLAG_VALUE(TOPDIR);
488 CHECK_FLAG_VALUE(HUGE_FILE);
489 CHECK_FLAG_VALUE(EXTENTS);
490 CHECK_FLAG_VALUE(EA_INODE);
491 CHECK_FLAG_VALUE(EOFBLOCKS);
492 CHECK_FLAG_VALUE(INLINE_DATA);
493 CHECK_FLAG_VALUE(RESERVED);
494 }
495
496 /* Used to pass group descriptor data when online resize is done */
497 struct ext4_new_group_input {
498 __u32 group; /* Group number for this data */
499 __u64 block_bitmap; /* Absolute block number of block bitmap */
500 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
501 __u64 inode_table; /* Absolute block number of inode table start */
502 __u32 blocks_count; /* Total number of blocks in this group */
503 __u16 reserved_blocks; /* Number of reserved blocks in this group */
504 __u16 unused;
505 };
506
507 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
508 struct compat_ext4_new_group_input {
509 u32 group;
510 compat_u64 block_bitmap;
511 compat_u64 inode_bitmap;
512 compat_u64 inode_table;
513 u32 blocks_count;
514 u16 reserved_blocks;
515 u16 unused;
516 };
517 #endif
518
519 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
520 struct ext4_new_group_data {
521 __u32 group;
522 __u64 block_bitmap;
523 __u64 inode_bitmap;
524 __u64 inode_table;
525 __u32 blocks_count;
526 __u16 reserved_blocks;
527 __u16 unused;
528 __u32 free_blocks_count;
529 };
530
531 /* Indexes used to index group tables in ext4_new_group_data */
532 enum {
533 BLOCK_BITMAP = 0, /* block bitmap */
534 INODE_BITMAP, /* inode bitmap */
535 INODE_TABLE, /* inode tables */
536 GROUP_TABLE_COUNT,
537 };
538
539 /*
540 * Flags used by ext4_map_blocks()
541 */
542 /* Allocate any needed blocks and/or convert an unitialized
543 extent to be an initialized ext4 */
544 #define EXT4_GET_BLOCKS_CREATE 0x0001
545 /* Request the creation of an unitialized extent */
546 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
547 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
548 EXT4_GET_BLOCKS_CREATE)
549 /* Caller is from the delayed allocation writeout path
550 * finally doing the actual allocation of delayed blocks */
551 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
552 /* caller is from the direct IO path, request to creation of an
553 unitialized extents if not allocated, split the uninitialized
554 extent if blocks has been preallocated already*/
555 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
556 #define EXT4_GET_BLOCKS_CONVERT 0x0010
557 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
558 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
559 /* Convert extent to initialized after IO complete */
560 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
561 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
562 /* Eventual metadata allocation (due to growing extent tree)
563 * should not fail, so try to use reserved blocks for that.*/
564 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
565 /* Don't normalize allocation size (used for fallocate) */
566 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
567 /* Request will not result in inode size update (user for fallocate) */
568 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
569 /* Do not take i_data_sem locking in ext4_map_blocks */
570 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
571 /* Do not put hole in extent cache */
572 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
573
574 /*
575 * Flags used by ext4_free_blocks
576 */
577 #define EXT4_FREE_BLOCKS_METADATA 0x0001
578 #define EXT4_FREE_BLOCKS_FORGET 0x0002
579 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
583
584 /*
585 * Flags used by ext4_discard_partial_page_buffers
586 */
587 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
588
589 /*
590 * ioctl commands
591 */
592 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
593 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
594 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
595 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
596 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
597 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
598 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
599 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
600 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
601 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
602 #define EXT4_IOC_MIGRATE _IO('f', 9)
603 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
604 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
605 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
606 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
607 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
608 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
609
610 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
611 /*
612 * ioctl commands in 32 bit emulation
613 */
614 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
615 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
616 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
617 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
618 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
619 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
620 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
621 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
622 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
623 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
624 #endif
625
626 /* Max physical block we can address w/o extents */
627 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
628
629 /*
630 * Structure of an inode on the disk
631 */
632 struct ext4_inode {
633 __le16 i_mode; /* File mode */
634 __le16 i_uid; /* Low 16 bits of Owner Uid */
635 __le32 i_size_lo; /* Size in bytes */
636 __le32 i_atime; /* Access time */
637 __le32 i_ctime; /* Inode Change time */
638 __le32 i_mtime; /* Modification time */
639 __le32 i_dtime; /* Deletion Time */
640 __le16 i_gid; /* Low 16 bits of Group Id */
641 __le16 i_links_count; /* Links count */
642 __le32 i_blocks_lo; /* Blocks count */
643 __le32 i_flags; /* File flags */
644 union {
645 struct {
646 __le32 l_i_version;
647 } linux1;
648 struct {
649 __u32 h_i_translator;
650 } hurd1;
651 struct {
652 __u32 m_i_reserved1;
653 } masix1;
654 } osd1; /* OS dependent 1 */
655 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
656 __le32 i_generation; /* File version (for NFS) */
657 __le32 i_file_acl_lo; /* File ACL */
658 __le32 i_size_high;
659 __le32 i_obso_faddr; /* Obsoleted fragment address */
660 union {
661 struct {
662 __le16 l_i_blocks_high; /* were l_i_reserved1 */
663 __le16 l_i_file_acl_high;
664 __le16 l_i_uid_high; /* these 2 fields */
665 __le16 l_i_gid_high; /* were reserved2[0] */
666 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
667 __le16 l_i_reserved;
668 } linux2;
669 struct {
670 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
671 __u16 h_i_mode_high;
672 __u16 h_i_uid_high;
673 __u16 h_i_gid_high;
674 __u32 h_i_author;
675 } hurd2;
676 struct {
677 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
678 __le16 m_i_file_acl_high;
679 __u32 m_i_reserved2[2];
680 } masix2;
681 } osd2; /* OS dependent 2 */
682 __le16 i_extra_isize;
683 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
684 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
685 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
686 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
687 __le32 i_crtime; /* File Creation time */
688 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
689 __le32 i_version_hi; /* high 32 bits for 64-bit version */
690 };
691
692 struct move_extent {
693 __u32 reserved; /* should be zero */
694 __u32 donor_fd; /* donor file descriptor */
695 __u64 orig_start; /* logical start offset in block for orig */
696 __u64 donor_start; /* logical start offset in block for donor */
697 __u64 len; /* block length to be moved */
698 __u64 moved_len; /* moved block length */
699 };
700
701 #define EXT4_EPOCH_BITS 2
702 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
703 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
704
705 /*
706 * Extended fields will fit into an inode if the filesystem was formatted
707 * with large inodes (-I 256 or larger) and there are not currently any EAs
708 * consuming all of the available space. For new inodes we always reserve
709 * enough space for the kernel's known extended fields, but for inodes
710 * created with an old kernel this might not have been the case. None of
711 * the extended inode fields is critical for correct filesystem operation.
712 * This macro checks if a certain field fits in the inode. Note that
713 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
714 */
715 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
716 ((offsetof(typeof(*ext4_inode), field) + \
717 sizeof((ext4_inode)->field)) \
718 <= (EXT4_GOOD_OLD_INODE_SIZE + \
719 (einode)->i_extra_isize)) \
720
721 static inline __le32 ext4_encode_extra_time(struct timespec *time)
722 {
723 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
724 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
725 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
726 }
727
728 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
729 {
730 if (sizeof(time->tv_sec) > 4)
731 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
732 << 32;
733 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
734 }
735
736 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
737 do { \
738 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
739 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
740 (raw_inode)->xtime ## _extra = \
741 ext4_encode_extra_time(&(inode)->xtime); \
742 } while (0)
743
744 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
745 do { \
746 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
747 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
748 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
749 (raw_inode)->xtime ## _extra = \
750 ext4_encode_extra_time(&(einode)->xtime); \
751 } while (0)
752
753 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
754 do { \
755 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
756 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
757 ext4_decode_extra_time(&(inode)->xtime, \
758 raw_inode->xtime ## _extra); \
759 else \
760 (inode)->xtime.tv_nsec = 0; \
761 } while (0)
762
763 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
764 do { \
765 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
766 (einode)->xtime.tv_sec = \
767 (signed)le32_to_cpu((raw_inode)->xtime); \
768 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
769 ext4_decode_extra_time(&(einode)->xtime, \
770 raw_inode->xtime ## _extra); \
771 else \
772 (einode)->xtime.tv_nsec = 0; \
773 } while (0)
774
775 #define i_disk_version osd1.linux1.l_i_version
776
777 #if defined(__KERNEL__) || defined(__linux__)
778 #define i_reserved1 osd1.linux1.l_i_reserved1
779 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
780 #define i_blocks_high osd2.linux2.l_i_blocks_high
781 #define i_uid_low i_uid
782 #define i_gid_low i_gid
783 #define i_uid_high osd2.linux2.l_i_uid_high
784 #define i_gid_high osd2.linux2.l_i_gid_high
785 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
786
787 #elif defined(__GNU__)
788
789 #define i_translator osd1.hurd1.h_i_translator
790 #define i_uid_high osd2.hurd2.h_i_uid_high
791 #define i_gid_high osd2.hurd2.h_i_gid_high
792 #define i_author osd2.hurd2.h_i_author
793
794 #elif defined(__masix__)
795
796 #define i_reserved1 osd1.masix1.m_i_reserved1
797 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
798 #define i_reserved2 osd2.masix2.m_i_reserved2
799
800 #endif /* defined(__KERNEL__) || defined(__linux__) */
801
802 #include "extents_status.h"
803
804 /*
805 * fourth extended file system inode data in memory
806 */
807 struct ext4_inode_info {
808 __le32 i_data[15]; /* unconverted */
809 __u32 i_dtime;
810 ext4_fsblk_t i_file_acl;
811
812 /*
813 * i_block_group is the number of the block group which contains
814 * this file's inode. Constant across the lifetime of the inode,
815 * it is ued for making block allocation decisions - we try to
816 * place a file's data blocks near its inode block, and new inodes
817 * near to their parent directory's inode.
818 */
819 ext4_group_t i_block_group;
820 ext4_lblk_t i_dir_start_lookup;
821 #if (BITS_PER_LONG < 64)
822 unsigned long i_state_flags; /* Dynamic state flags */
823 #endif
824 unsigned long i_flags;
825
826 /*
827 * Extended attributes can be read independently of the main file
828 * data. Taking i_mutex even when reading would cause contention
829 * between readers of EAs and writers of regular file data, so
830 * instead we synchronize on xattr_sem when reading or changing
831 * EAs.
832 */
833 struct rw_semaphore xattr_sem;
834
835 struct list_head i_orphan; /* unlinked but open inodes */
836
837 /*
838 * i_disksize keeps track of what the inode size is ON DISK, not
839 * in memory. During truncate, i_size is set to the new size by
840 * the VFS prior to calling ext4_truncate(), but the filesystem won't
841 * set i_disksize to 0 until the truncate is actually under way.
842 *
843 * The intent is that i_disksize always represents the blocks which
844 * are used by this file. This allows recovery to restart truncate
845 * on orphans if we crash during truncate. We actually write i_disksize
846 * into the on-disk inode when writing inodes out, instead of i_size.
847 *
848 * The only time when i_disksize and i_size may be different is when
849 * a truncate is in progress. The only things which change i_disksize
850 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
851 */
852 loff_t i_disksize;
853
854 /*
855 * i_data_sem is for serialising ext4_truncate() against
856 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
857 * data tree are chopped off during truncate. We can't do that in
858 * ext4 because whenever we perform intermediate commits during
859 * truncate, the inode and all the metadata blocks *must* be in a
860 * consistent state which allows truncation of the orphans to restart
861 * during recovery. Hence we must fix the get_block-vs-truncate race
862 * by other means, so we have i_data_sem.
863 */
864 struct rw_semaphore i_data_sem;
865 struct inode vfs_inode;
866 struct jbd2_inode *jinode;
867
868 /*
869 * File creation time. Its function is same as that of
870 * struct timespec i_{a,c,m}time in the generic inode.
871 */
872 struct timespec i_crtime;
873
874 /* mballoc */
875 struct list_head i_prealloc_list;
876 spinlock_t i_prealloc_lock;
877
878 /* extents status tree */
879 struct ext4_es_tree i_es_tree;
880 rwlock_t i_es_lock;
881 struct list_head i_es_lru;
882 unsigned int i_es_lru_nr; /* protected by i_es_lock */
883
884 /* ialloc */
885 ext4_group_t i_last_alloc_group;
886
887 /* allocation reservation info for delalloc */
888 /* In case of bigalloc, these refer to clusters rather than blocks */
889 unsigned int i_reserved_data_blocks;
890 unsigned int i_reserved_meta_blocks;
891 unsigned int i_allocated_meta_blocks;
892 ext4_lblk_t i_da_metadata_calc_last_lblock;
893 int i_da_metadata_calc_len;
894
895 /* on-disk additional length */
896 __u16 i_extra_isize;
897
898 /* Indicate the inline data space. */
899 u16 i_inline_off;
900 u16 i_inline_size;
901
902 #ifdef CONFIG_QUOTA
903 /* quota space reservation, managed internally by quota code */
904 qsize_t i_reserved_quota;
905 #endif
906
907 /* completed IOs that might need unwritten extents handling */
908 struct list_head i_completed_io_list;
909 spinlock_t i_completed_io_lock;
910 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
911 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
912 struct work_struct i_unwritten_work; /* deferred extent conversion */
913
914 spinlock_t i_block_reservation_lock;
915
916 /*
917 * Transactions that contain inode's metadata needed to complete
918 * fsync and fdatasync, respectively.
919 */
920 tid_t i_sync_tid;
921 tid_t i_datasync_tid;
922
923 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
924 __u32 i_csum_seed;
925 };
926
927 /*
928 * File system states
929 */
930 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
931 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
932 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
933
934 /*
935 * Misc. filesystem flags
936 */
937 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
938 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
939 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
940
941 /*
942 * Mount flags set via mount options or defaults
943 */
944 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
945 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
946 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
947 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
948 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
949 #define EXT4_MOUNT_ERRORS_MASK 0x00070
950 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
951 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
952 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
953 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
954 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
955 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
956 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
957 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
958 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
959 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
960 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
961 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
962 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
963 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
964 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
965 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
966 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
967 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
968 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
969 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
970 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
971 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
972 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
973
974 /*
975 * Mount flags set either automatically (could not be set by mount option)
976 * based on per file system feature or property or in special cases such as
977 * distinguishing between explicit mount option definition and default.
978 */
979 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
980 specified delalloc */
981 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
982 size of blocksize * 8
983 blocks */
984
985 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
986 ~EXT4_MOUNT_##opt
987 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
988 EXT4_MOUNT_##opt
989 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
990 EXT4_MOUNT_##opt)
991
992 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
993 ~EXT4_MOUNT2_##opt
994 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
995 EXT4_MOUNT2_##opt
996 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
997 EXT4_MOUNT2_##opt)
998
999 #define ext4_test_and_set_bit __test_and_set_bit_le
1000 #define ext4_set_bit __set_bit_le
1001 #define ext4_set_bit_atomic ext2_set_bit_atomic
1002 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1003 #define ext4_clear_bit __clear_bit_le
1004 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1005 #define ext4_test_bit test_bit_le
1006 #define ext4_find_next_zero_bit find_next_zero_bit_le
1007 #define ext4_find_next_bit find_next_bit_le
1008
1009 extern void ext4_set_bits(void *bm, int cur, int len);
1010
1011 /*
1012 * Maximal mount counts between two filesystem checks
1013 */
1014 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1015 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1016
1017 /*
1018 * Behaviour when detecting errors
1019 */
1020 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1021 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1022 #define EXT4_ERRORS_PANIC 3 /* Panic */
1023 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1024
1025 /* Metadata checksum algorithm codes */
1026 #define EXT4_CRC32C_CHKSUM 1
1027
1028 /*
1029 * Structure of the super block
1030 */
1031 struct ext4_super_block {
1032 /*00*/ __le32 s_inodes_count; /* Inodes count */
1033 __le32 s_blocks_count_lo; /* Blocks count */
1034 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1035 __le32 s_free_blocks_count_lo; /* Free blocks count */
1036 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1037 __le32 s_first_data_block; /* First Data Block */
1038 __le32 s_log_block_size; /* Block size */
1039 __le32 s_log_cluster_size; /* Allocation cluster size */
1040 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1041 __le32 s_clusters_per_group; /* # Clusters per group */
1042 __le32 s_inodes_per_group; /* # Inodes per group */
1043 __le32 s_mtime; /* Mount time */
1044 /*30*/ __le32 s_wtime; /* Write time */
1045 __le16 s_mnt_count; /* Mount count */
1046 __le16 s_max_mnt_count; /* Maximal mount count */
1047 __le16 s_magic; /* Magic signature */
1048 __le16 s_state; /* File system state */
1049 __le16 s_errors; /* Behaviour when detecting errors */
1050 __le16 s_minor_rev_level; /* minor revision level */
1051 /*40*/ __le32 s_lastcheck; /* time of last check */
1052 __le32 s_checkinterval; /* max. time between checks */
1053 __le32 s_creator_os; /* OS */
1054 __le32 s_rev_level; /* Revision level */
1055 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1056 __le16 s_def_resgid; /* Default gid for reserved blocks */
1057 /*
1058 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1059 *
1060 * Note: the difference between the compatible feature set and
1061 * the incompatible feature set is that if there is a bit set
1062 * in the incompatible feature set that the kernel doesn't
1063 * know about, it should refuse to mount the filesystem.
1064 *
1065 * e2fsck's requirements are more strict; if it doesn't know
1066 * about a feature in either the compatible or incompatible
1067 * feature set, it must abort and not try to meddle with
1068 * things it doesn't understand...
1069 */
1070 __le32 s_first_ino; /* First non-reserved inode */
1071 __le16 s_inode_size; /* size of inode structure */
1072 __le16 s_block_group_nr; /* block group # of this superblock */
1073 __le32 s_feature_compat; /* compatible feature set */
1074 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1075 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1076 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1077 /*78*/ char s_volume_name[16]; /* volume name */
1078 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1079 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1080 /*
1081 * Performance hints. Directory preallocation should only
1082 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1083 */
1084 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1085 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1086 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1087 /*
1088 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1089 */
1090 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1091 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1092 __le32 s_journal_dev; /* device number of journal file */
1093 __le32 s_last_orphan; /* start of list of inodes to delete */
1094 __le32 s_hash_seed[4]; /* HTREE hash seed */
1095 __u8 s_def_hash_version; /* Default hash version to use */
1096 __u8 s_jnl_backup_type;
1097 __le16 s_desc_size; /* size of group descriptor */
1098 /*100*/ __le32 s_default_mount_opts;
1099 __le32 s_first_meta_bg; /* First metablock block group */
1100 __le32 s_mkfs_time; /* When the filesystem was created */
1101 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1102 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1103 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1104 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1105 __le32 s_free_blocks_count_hi; /* Free blocks count */
1106 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1107 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1108 __le32 s_flags; /* Miscellaneous flags */
1109 __le16 s_raid_stride; /* RAID stride */
1110 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1111 __le64 s_mmp_block; /* Block for multi-mount protection */
1112 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1113 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1114 __u8 s_checksum_type; /* metadata checksum algorithm used */
1115 __le16 s_reserved_pad;
1116 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1117 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1118 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1119 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1120 snapshot's future use */
1121 __le32 s_snapshot_list; /* inode number of the head of the
1122 on-disk snapshot list */
1123 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1124 __le32 s_error_count; /* number of fs errors */
1125 __le32 s_first_error_time; /* first time an error happened */
1126 __le32 s_first_error_ino; /* inode involved in first error */
1127 __le64 s_first_error_block; /* block involved of first error */
1128 __u8 s_first_error_func[32]; /* function where the error happened */
1129 __le32 s_first_error_line; /* line number where error happened */
1130 __le32 s_last_error_time; /* most recent time of an error */
1131 __le32 s_last_error_ino; /* inode involved in last error */
1132 __le32 s_last_error_line; /* line number where error happened */
1133 __le64 s_last_error_block; /* block involved of last error */
1134 __u8 s_last_error_func[32]; /* function where the error happened */
1135 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1136 __u8 s_mount_opts[64];
1137 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1138 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1139 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1140 __le32 s_reserved[108]; /* Padding to the end of the block */
1141 __le32 s_checksum; /* crc32c(superblock) */
1142 };
1143
1144 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1145
1146 #ifdef __KERNEL__
1147
1148 /*
1149 * run-time mount flags
1150 */
1151 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1152 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1153
1154 /*
1155 * fourth extended-fs super-block data in memory
1156 */
1157 struct ext4_sb_info {
1158 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1159 unsigned long s_inodes_per_block;/* Number of inodes per block */
1160 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1161 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1162 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1163 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1164 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1165 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1166 ext4_group_t s_groups_count; /* Number of groups in the fs */
1167 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1168 unsigned long s_overhead; /* # of fs overhead clusters */
1169 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1170 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1171 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1172 struct buffer_head * s_sbh; /* Buffer containing the super block */
1173 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1174 struct buffer_head **s_group_desc;
1175 unsigned int s_mount_opt;
1176 unsigned int s_mount_opt2;
1177 unsigned int s_mount_flags;
1178 unsigned int s_def_mount_opt;
1179 ext4_fsblk_t s_sb_block;
1180 atomic64_t s_resv_clusters;
1181 kuid_t s_resuid;
1182 kgid_t s_resgid;
1183 unsigned short s_mount_state;
1184 unsigned short s_pad;
1185 int s_addr_per_block_bits;
1186 int s_desc_per_block_bits;
1187 int s_inode_size;
1188 int s_first_ino;
1189 unsigned int s_inode_readahead_blks;
1190 unsigned int s_inode_goal;
1191 spinlock_t s_next_gen_lock;
1192 u32 s_next_generation;
1193 u32 s_hash_seed[4];
1194 int s_def_hash_version;
1195 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1196 struct percpu_counter s_freeclusters_counter;
1197 struct percpu_counter s_freeinodes_counter;
1198 struct percpu_counter s_dirs_counter;
1199 struct percpu_counter s_dirtyclusters_counter;
1200 struct blockgroup_lock *s_blockgroup_lock;
1201 struct proc_dir_entry *s_proc;
1202 struct kobject s_kobj;
1203 struct completion s_kobj_unregister;
1204 struct super_block *s_sb;
1205
1206 /* Journaling */
1207 struct journal_s *s_journal;
1208 struct list_head s_orphan;
1209 struct mutex s_orphan_lock;
1210 unsigned long s_resize_flags; /* Flags indicating if there
1211 is a resizer */
1212 unsigned long s_commit_interval;
1213 u32 s_max_batch_time;
1214 u32 s_min_batch_time;
1215 struct block_device *journal_bdev;
1216 #ifdef CONFIG_QUOTA
1217 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1218 int s_jquota_fmt; /* Format of quota to use */
1219 #endif
1220 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1221 struct rb_root system_blks;
1222
1223 #ifdef EXTENTS_STATS
1224 /* ext4 extents stats */
1225 unsigned long s_ext_min;
1226 unsigned long s_ext_max;
1227 unsigned long s_depth_max;
1228 spinlock_t s_ext_stats_lock;
1229 unsigned long s_ext_blocks;
1230 unsigned long s_ext_extents;
1231 #endif
1232
1233 /* for buddy allocator */
1234 struct ext4_group_info ***s_group_info;
1235 struct inode *s_buddy_cache;
1236 spinlock_t s_md_lock;
1237 unsigned short *s_mb_offsets;
1238 unsigned int *s_mb_maxs;
1239 unsigned int s_group_info_size;
1240
1241 /* tunables */
1242 unsigned long s_stripe;
1243 unsigned int s_mb_stream_request;
1244 unsigned int s_mb_max_to_scan;
1245 unsigned int s_mb_min_to_scan;
1246 unsigned int s_mb_stats;
1247 unsigned int s_mb_order2_reqs;
1248 unsigned int s_mb_group_prealloc;
1249 unsigned int s_max_writeback_mb_bump;
1250 unsigned int s_max_dir_size_kb;
1251 /* where last allocation was done - for stream allocation */
1252 unsigned long s_mb_last_group;
1253 unsigned long s_mb_last_start;
1254
1255 /* stats for buddy allocator */
1256 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1257 atomic_t s_bal_success; /* we found long enough chunks */
1258 atomic_t s_bal_allocated; /* in blocks */
1259 atomic_t s_bal_ex_scanned; /* total extents scanned */
1260 atomic_t s_bal_goals; /* goal hits */
1261 atomic_t s_bal_breaks; /* too long searches */
1262 atomic_t s_bal_2orders; /* 2^order hits */
1263 spinlock_t s_bal_lock;
1264 unsigned long s_mb_buddies_generated;
1265 unsigned long long s_mb_generation_time;
1266 atomic_t s_mb_lost_chunks;
1267 atomic_t s_mb_preallocated;
1268 atomic_t s_mb_discarded;
1269 atomic_t s_lock_busy;
1270
1271 /* locality groups */
1272 struct ext4_locality_group __percpu *s_locality_groups;
1273
1274 /* for write statistics */
1275 unsigned long s_sectors_written_start;
1276 u64 s_kbytes_written;
1277
1278 /* the size of zero-out chunk */
1279 unsigned int s_extent_max_zeroout_kb;
1280
1281 unsigned int s_log_groups_per_flex;
1282 struct flex_groups *s_flex_groups;
1283 ext4_group_t s_flex_groups_allocated;
1284
1285 /* workqueue for dio unwritten */
1286 struct workqueue_struct *dio_unwritten_wq;
1287
1288 /* timer for periodic error stats printing */
1289 struct timer_list s_err_report;
1290
1291 /* Lazy inode table initialization info */
1292 struct ext4_li_request *s_li_request;
1293 /* Wait multiplier for lazy initialization thread */
1294 unsigned int s_li_wait_mult;
1295
1296 /* Kernel thread for multiple mount protection */
1297 struct task_struct *s_mmp_tsk;
1298
1299 /* record the last minlen when FITRIM is called. */
1300 atomic_t s_last_trim_minblks;
1301
1302 /* Reference to checksum algorithm driver via cryptoapi */
1303 struct crypto_shash *s_chksum_driver;
1304
1305 /* Precomputed FS UUID checksum for seeding other checksums */
1306 __u32 s_csum_seed;
1307
1308 /* Reclaim extents from extent status tree */
1309 struct shrinker s_es_shrinker;
1310 struct list_head s_es_lru;
1311 struct percpu_counter s_extent_cache_cnt;
1312 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
1313 };
1314
1315 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1316 {
1317 return sb->s_fs_info;
1318 }
1319 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1320 {
1321 return container_of(inode, struct ext4_inode_info, vfs_inode);
1322 }
1323
1324 static inline struct timespec ext4_current_time(struct inode *inode)
1325 {
1326 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1327 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1328 }
1329
1330 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1331 {
1332 return ino == EXT4_ROOT_INO ||
1333 ino == EXT4_USR_QUOTA_INO ||
1334 ino == EXT4_GRP_QUOTA_INO ||
1335 ino == EXT4_BOOT_LOADER_INO ||
1336 ino == EXT4_JOURNAL_INO ||
1337 ino == EXT4_RESIZE_INO ||
1338 (ino >= EXT4_FIRST_INO(sb) &&
1339 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1340 }
1341
1342 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1343 struct ext4_io_end *io_end)
1344 {
1345 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1346 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1347 atomic_inc(&EXT4_I(inode)->i_unwritten);
1348 }
1349 }
1350
1351 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1352 {
1353 return inode->i_private;
1354 }
1355
1356 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1357 {
1358 inode->i_private = io;
1359 }
1360
1361 /*
1362 * Inode dynamic state flags
1363 */
1364 enum {
1365 EXT4_STATE_JDATA, /* journaled data exists */
1366 EXT4_STATE_NEW, /* inode is newly created */
1367 EXT4_STATE_XATTR, /* has in-inode xattrs */
1368 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1369 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1370 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1371 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1372 EXT4_STATE_NEWENTRY, /* File just added to dir */
1373 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1374 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1375 nolocking */
1376 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1377 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1378 };
1379
1380 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1381 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1382 { \
1383 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1384 } \
1385 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1386 { \
1387 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1388 } \
1389 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1390 { \
1391 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1392 }
1393
1394 EXT4_INODE_BIT_FNS(flag, flags, 0)
1395 #if (BITS_PER_LONG < 64)
1396 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1397
1398 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1399 {
1400 (ei)->i_state_flags = 0;
1401 }
1402 #else
1403 EXT4_INODE_BIT_FNS(state, flags, 32)
1404
1405 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1406 {
1407 /* We depend on the fact that callers will set i_flags */
1408 }
1409 #endif
1410 #else
1411 /* Assume that user mode programs are passing in an ext4fs superblock, not
1412 * a kernel struct super_block. This will allow us to call the feature-test
1413 * macros from user land. */
1414 #define EXT4_SB(sb) (sb)
1415 #endif
1416
1417 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1418
1419 /*
1420 * Codes for operating systems
1421 */
1422 #define EXT4_OS_LINUX 0
1423 #define EXT4_OS_HURD 1
1424 #define EXT4_OS_MASIX 2
1425 #define EXT4_OS_FREEBSD 3
1426 #define EXT4_OS_LITES 4
1427
1428 /*
1429 * Revision levels
1430 */
1431 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1432 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1433
1434 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1435 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1436
1437 #define EXT4_GOOD_OLD_INODE_SIZE 128
1438
1439 /*
1440 * Feature set definitions
1441 */
1442
1443 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1444 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1445 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1446 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1447 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1448 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1449 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1450 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1451 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1452 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1453 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1454 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1455 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1456 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1457 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1458 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1459 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1460 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1461
1462 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1463 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1464 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1465 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1466 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1467 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1468
1469 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1470 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1471 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1472 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1473 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1474 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1475 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1476 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1477 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1478 /*
1479 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1480 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1481 * all other data structures' checksums. However, the METADATA_CSUM and
1482 * GDT_CSUM bits are mutually exclusive.
1483 */
1484 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1485
1486 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1487 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1488 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1489 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1490 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1491 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1492 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1493 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1494 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1495 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1496 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1497 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1498 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1499 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1500
1501 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1502 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1503 EXT4_FEATURE_INCOMPAT_META_BG)
1504 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1505 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1506 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1507
1508 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1509 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1510 EXT4_FEATURE_INCOMPAT_RECOVER| \
1511 EXT4_FEATURE_INCOMPAT_META_BG)
1512 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1513 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1514 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1515
1516 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1517 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1518 EXT4_FEATURE_INCOMPAT_RECOVER| \
1519 EXT4_FEATURE_INCOMPAT_META_BG| \
1520 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1521 EXT4_FEATURE_INCOMPAT_64BIT| \
1522 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1523 EXT4_FEATURE_INCOMPAT_MMP | \
1524 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1525 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1526 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1527 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1528 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1529 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1530 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1531 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1532 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1533 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1534 EXT4_FEATURE_RO_COMPAT_QUOTA)
1535
1536 /*
1537 * Default values for user and/or group using reserved blocks
1538 */
1539 #define EXT4_DEF_RESUID 0
1540 #define EXT4_DEF_RESGID 0
1541
1542 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1543
1544 /*
1545 * Default mount options
1546 */
1547 #define EXT4_DEFM_DEBUG 0x0001
1548 #define EXT4_DEFM_BSDGROUPS 0x0002
1549 #define EXT4_DEFM_XATTR_USER 0x0004
1550 #define EXT4_DEFM_ACL 0x0008
1551 #define EXT4_DEFM_UID16 0x0010
1552 #define EXT4_DEFM_JMODE 0x0060
1553 #define EXT4_DEFM_JMODE_DATA 0x0020
1554 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1555 #define EXT4_DEFM_JMODE_WBACK 0x0060
1556 #define EXT4_DEFM_NOBARRIER 0x0100
1557 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1558 #define EXT4_DEFM_DISCARD 0x0400
1559 #define EXT4_DEFM_NODELALLOC 0x0800
1560
1561 /*
1562 * Default journal batch times
1563 */
1564 #define EXT4_DEF_MIN_BATCH_TIME 0
1565 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1566
1567 /*
1568 * Minimum number of groups in a flexgroup before we separate out
1569 * directories into the first block group of a flexgroup
1570 */
1571 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1572
1573 /*
1574 * Structure of a directory entry
1575 */
1576 #define EXT4_NAME_LEN 255
1577
1578 struct ext4_dir_entry {
1579 __le32 inode; /* Inode number */
1580 __le16 rec_len; /* Directory entry length */
1581 __le16 name_len; /* Name length */
1582 char name[EXT4_NAME_LEN]; /* File name */
1583 };
1584
1585 /*
1586 * The new version of the directory entry. Since EXT4 structures are
1587 * stored in intel byte order, and the name_len field could never be
1588 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1589 * file_type field.
1590 */
1591 struct ext4_dir_entry_2 {
1592 __le32 inode; /* Inode number */
1593 __le16 rec_len; /* Directory entry length */
1594 __u8 name_len; /* Name length */
1595 __u8 file_type;
1596 char name[EXT4_NAME_LEN]; /* File name */
1597 };
1598
1599 /*
1600 * This is a bogus directory entry at the end of each leaf block that
1601 * records checksums.
1602 */
1603 struct ext4_dir_entry_tail {
1604 __le32 det_reserved_zero1; /* Pretend to be unused */
1605 __le16 det_rec_len; /* 12 */
1606 __u8 det_reserved_zero2; /* Zero name length */
1607 __u8 det_reserved_ft; /* 0xDE, fake file type */
1608 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1609 };
1610
1611 #define EXT4_DIRENT_TAIL(block, blocksize) \
1612 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1613 ((blocksize) - \
1614 sizeof(struct ext4_dir_entry_tail))))
1615
1616 /*
1617 * Ext4 directory file types. Only the low 3 bits are used. The
1618 * other bits are reserved for now.
1619 */
1620 #define EXT4_FT_UNKNOWN 0
1621 #define EXT4_FT_REG_FILE 1
1622 #define EXT4_FT_DIR 2
1623 #define EXT4_FT_CHRDEV 3
1624 #define EXT4_FT_BLKDEV 4
1625 #define EXT4_FT_FIFO 5
1626 #define EXT4_FT_SOCK 6
1627 #define EXT4_FT_SYMLINK 7
1628
1629 #define EXT4_FT_MAX 8
1630
1631 #define EXT4_FT_DIR_CSUM 0xDE
1632
1633 /*
1634 * EXT4_DIR_PAD defines the directory entries boundaries
1635 *
1636 * NOTE: It must be a multiple of 4
1637 */
1638 #define EXT4_DIR_PAD 4
1639 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1640 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1641 ~EXT4_DIR_ROUND)
1642 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1643
1644 /*
1645 * If we ever get support for fs block sizes > page_size, we'll need
1646 * to remove the #if statements in the next two functions...
1647 */
1648 static inline unsigned int
1649 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1650 {
1651 unsigned len = le16_to_cpu(dlen);
1652
1653 #if (PAGE_CACHE_SIZE >= 65536)
1654 if (len == EXT4_MAX_REC_LEN || len == 0)
1655 return blocksize;
1656 return (len & 65532) | ((len & 3) << 16);
1657 #else
1658 return len;
1659 #endif
1660 }
1661
1662 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1663 {
1664 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1665 BUG();
1666 #if (PAGE_CACHE_SIZE >= 65536)
1667 if (len < 65536)
1668 return cpu_to_le16(len);
1669 if (len == blocksize) {
1670 if (blocksize == 65536)
1671 return cpu_to_le16(EXT4_MAX_REC_LEN);
1672 else
1673 return cpu_to_le16(0);
1674 }
1675 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1676 #else
1677 return cpu_to_le16(len);
1678 #endif
1679 }
1680
1681 /*
1682 * Hash Tree Directory indexing
1683 * (c) Daniel Phillips, 2001
1684 */
1685
1686 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1687 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1688 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1689 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1690 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1691
1692 /* Legal values for the dx_root hash_version field: */
1693
1694 #define DX_HASH_LEGACY 0
1695 #define DX_HASH_HALF_MD4 1
1696 #define DX_HASH_TEA 2
1697 #define DX_HASH_LEGACY_UNSIGNED 3
1698 #define DX_HASH_HALF_MD4_UNSIGNED 4
1699 #define DX_HASH_TEA_UNSIGNED 5
1700
1701 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1702 const void *address, unsigned int length)
1703 {
1704 struct {
1705 struct shash_desc shash;
1706 char ctx[4];
1707 } desc;
1708 int err;
1709
1710 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1711
1712 desc.shash.tfm = sbi->s_chksum_driver;
1713 desc.shash.flags = 0;
1714 *(u32 *)desc.ctx = crc;
1715
1716 err = crypto_shash_update(&desc.shash, address, length);
1717 BUG_ON(err);
1718
1719 return *(u32 *)desc.ctx;
1720 }
1721
1722 #ifdef __KERNEL__
1723
1724 /* hash info structure used by the directory hash */
1725 struct dx_hash_info
1726 {
1727 u32 hash;
1728 u32 minor_hash;
1729 int hash_version;
1730 u32 *seed;
1731 };
1732
1733
1734 /* 32 and 64 bit signed EOF for dx directories */
1735 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1736 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1737
1738
1739 /*
1740 * Control parameters used by ext4_htree_next_block
1741 */
1742 #define HASH_NB_ALWAYS 1
1743
1744
1745 /*
1746 * Describe an inode's exact location on disk and in memory
1747 */
1748 struct ext4_iloc
1749 {
1750 struct buffer_head *bh;
1751 unsigned long offset;
1752 ext4_group_t block_group;
1753 };
1754
1755 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1756 {
1757 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1758 }
1759
1760 /*
1761 * This structure is stuffed into the struct file's private_data field
1762 * for directories. It is where we put information so that we can do
1763 * readdir operations in hash tree order.
1764 */
1765 struct dir_private_info {
1766 struct rb_root root;
1767 struct rb_node *curr_node;
1768 struct fname *extra_fname;
1769 loff_t last_pos;
1770 __u32 curr_hash;
1771 __u32 curr_minor_hash;
1772 __u32 next_hash;
1773 };
1774
1775 /* calculate the first block number of the group */
1776 static inline ext4_fsblk_t
1777 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1778 {
1779 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1780 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1781 }
1782
1783 /*
1784 * Special error return code only used by dx_probe() and its callers.
1785 */
1786 #define ERR_BAD_DX_DIR -75000
1787
1788 /*
1789 * Timeout and state flag for lazy initialization inode thread.
1790 */
1791 #define EXT4_DEF_LI_WAIT_MULT 10
1792 #define EXT4_DEF_LI_MAX_START_DELAY 5
1793 #define EXT4_LAZYINIT_QUIT 0x0001
1794 #define EXT4_LAZYINIT_RUNNING 0x0002
1795
1796 /*
1797 * Lazy inode table initialization info
1798 */
1799 struct ext4_lazy_init {
1800 unsigned long li_state;
1801 struct list_head li_request_list;
1802 struct mutex li_list_mtx;
1803 };
1804
1805 struct ext4_li_request {
1806 struct super_block *lr_super;
1807 struct ext4_sb_info *lr_sbi;
1808 ext4_group_t lr_next_group;
1809 struct list_head lr_request;
1810 unsigned long lr_next_sched;
1811 unsigned long lr_timeout;
1812 };
1813
1814 struct ext4_features {
1815 struct kobject f_kobj;
1816 struct completion f_kobj_unregister;
1817 };
1818
1819 /*
1820 * This structure will be used for multiple mount protection. It will be
1821 * written into the block number saved in the s_mmp_block field in the
1822 * superblock. Programs that check MMP should assume that if
1823 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1824 * to use the filesystem, regardless of how old the timestamp is.
1825 */
1826 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1827 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1828 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1829 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1830
1831 struct mmp_struct {
1832 __le32 mmp_magic; /* Magic number for MMP */
1833 __le32 mmp_seq; /* Sequence no. updated periodically */
1834
1835 /*
1836 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1837 * purposes and do not affect the correctness of the algorithm
1838 */
1839 __le64 mmp_time; /* Time last updated */
1840 char mmp_nodename[64]; /* Node which last updated MMP block */
1841 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1842
1843 /*
1844 * mmp_check_interval is used to verify if the MMP block has been
1845 * updated on the block device. The value is updated based on the
1846 * maximum time to write the MMP block during an update cycle.
1847 */
1848 __le16 mmp_check_interval;
1849
1850 __le16 mmp_pad1;
1851 __le32 mmp_pad2[226];
1852 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1853 };
1854
1855 /* arguments passed to the mmp thread */
1856 struct mmpd_data {
1857 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1858 struct super_block *sb; /* super block of the fs */
1859 };
1860
1861 /*
1862 * Check interval multiplier
1863 * The MMP block is written every update interval and initially checked every
1864 * update interval x the multiplier (the value is then adapted based on the
1865 * write latency). The reason is that writes can be delayed under load and we
1866 * don't want readers to incorrectly assume that the filesystem is no longer
1867 * in use.
1868 */
1869 #define EXT4_MMP_CHECK_MULT 2UL
1870
1871 /*
1872 * Minimum interval for MMP checking in seconds.
1873 */
1874 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1875
1876 /*
1877 * Maximum interval for MMP checking in seconds.
1878 */
1879 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1880
1881 /*
1882 * Function prototypes
1883 */
1884
1885 /*
1886 * Ok, these declarations are also in <linux/kernel.h> but none of the
1887 * ext4 source programs needs to include it so they are duplicated here.
1888 */
1889 # define NORET_TYPE /**/
1890 # define ATTRIB_NORET __attribute__((noreturn))
1891 # define NORET_AND noreturn,
1892
1893 /* bitmap.c */
1894 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1895 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1896 struct ext4_group_desc *gdp,
1897 struct buffer_head *bh, int sz);
1898 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1899 struct ext4_group_desc *gdp,
1900 struct buffer_head *bh, int sz);
1901 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1902 struct ext4_group_desc *gdp,
1903 struct buffer_head *bh);
1904 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1905 struct ext4_group_desc *gdp,
1906 struct buffer_head *bh);
1907
1908 /* balloc.c */
1909 extern void ext4_get_group_no_and_offset(struct super_block *sb,
1910 ext4_fsblk_t blocknr,
1911 ext4_group_t *blockgrpp,
1912 ext4_grpblk_t *offsetp);
1913 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1914 ext4_fsblk_t block);
1915
1916 extern void ext4_validate_block_bitmap(struct super_block *sb,
1917 struct ext4_group_desc *desc,
1918 unsigned int block_group,
1919 struct buffer_head *bh);
1920 extern unsigned int ext4_block_group(struct super_block *sb,
1921 ext4_fsblk_t blocknr);
1922 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1923 ext4_fsblk_t blocknr);
1924 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1925 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1926 ext4_group_t group);
1927 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1928 ext4_fsblk_t goal,
1929 unsigned int flags,
1930 unsigned long *count,
1931 int *errp);
1932 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1933 s64 nclusters, unsigned int flags);
1934 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1935 extern void ext4_check_blocks_bitmap(struct super_block *);
1936 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1937 ext4_group_t block_group,
1938 struct buffer_head ** bh);
1939 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1940
1941 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1942 ext4_group_t block_group);
1943 extern int ext4_wait_block_bitmap(struct super_block *sb,
1944 ext4_group_t block_group,
1945 struct buffer_head *bh);
1946 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1947 ext4_group_t block_group);
1948 extern void ext4_init_block_bitmap(struct super_block *sb,
1949 struct buffer_head *bh,
1950 ext4_group_t group,
1951 struct ext4_group_desc *desc);
1952 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1953 ext4_group_t block_group,
1954 struct ext4_group_desc *gdp);
1955 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1956 ext4_group_t block_group,
1957 struct ext4_group_desc *gdp);
1958 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1959
1960 /* dir.c */
1961 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1962 struct file *,
1963 struct ext4_dir_entry_2 *,
1964 struct buffer_head *, char *, int,
1965 unsigned int);
1966 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1967 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1968 (de), (bh), (buf), (size), (offset)))
1969 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1970 __u32 minor_hash,
1971 struct ext4_dir_entry_2 *dirent);
1972 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1973 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1974 struct buffer_head *bh,
1975 void *buf, int buf_size,
1976 const char *name, int namelen,
1977 struct ext4_dir_entry_2 **dest_de);
1978 void ext4_insert_dentry(struct inode *inode,
1979 struct ext4_dir_entry_2 *de,
1980 int buf_size,
1981 const char *name, int namelen);
1982 static inline void ext4_update_dx_flag(struct inode *inode)
1983 {
1984 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
1985 EXT4_FEATURE_COMPAT_DIR_INDEX))
1986 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
1987 }
1988 static unsigned char ext4_filetype_table[] = {
1989 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1990 };
1991
1992 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
1993 {
1994 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
1995 (filetype >= EXT4_FT_MAX))
1996 return DT_UNKNOWN;
1997
1998 return ext4_filetype_table[filetype];
1999 }
2000
2001 /* fsync.c */
2002 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2003 extern int ext4_flush_unwritten_io(struct inode *);
2004
2005 /* hash.c */
2006 extern int ext4fs_dirhash(const char *name, int len, struct
2007 dx_hash_info *hinfo);
2008
2009 /* ialloc.c */
2010 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2011 const struct qstr *qstr, __u32 goal,
2012 uid_t *owner, int handle_type,
2013 unsigned int line_no, int nblocks);
2014
2015 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2016 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2017 0, 0, 0)
2018 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2019 type, nblocks) \
2020 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2021 (type), __LINE__, (nblocks))
2022
2023
2024 extern void ext4_free_inode(handle_t *, struct inode *);
2025 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2026 extern unsigned long ext4_count_free_inodes(struct super_block *);
2027 extern unsigned long ext4_count_dirs(struct super_block *);
2028 extern void ext4_check_inodes_bitmap(struct super_block *);
2029 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2030 extern int ext4_init_inode_table(struct super_block *sb,
2031 ext4_group_t group, int barrier);
2032 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2033
2034 /* mballoc.c */
2035 extern long ext4_mb_stats;
2036 extern long ext4_mb_max_to_scan;
2037 extern int ext4_mb_init(struct super_block *);
2038 extern int ext4_mb_release(struct super_block *);
2039 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2040 struct ext4_allocation_request *, int *);
2041 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2042 extern void ext4_discard_preallocations(struct inode *);
2043 extern int __init ext4_init_mballoc(void);
2044 extern void ext4_exit_mballoc(void);
2045 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2046 struct buffer_head *bh, ext4_fsblk_t block,
2047 unsigned long count, int flags);
2048 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2049 ext4_group_t ngroups);
2050 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2051 ext4_group_t i, struct ext4_group_desc *desc);
2052 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2053 ext4_fsblk_t block, unsigned long count);
2054 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2055
2056 /* inode.c */
2057 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2058 ext4_lblk_t, int, int *);
2059 struct buffer_head *ext4_bread(handle_t *, struct inode *,
2060 ext4_lblk_t, int, int *);
2061 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2062 struct buffer_head *bh_result, int create);
2063 int ext4_get_block(struct inode *inode, sector_t iblock,
2064 struct buffer_head *bh_result, int create);
2065 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2066 struct buffer_head *bh, int create);
2067 int ext4_walk_page_buffers(handle_t *handle,
2068 struct buffer_head *head,
2069 unsigned from,
2070 unsigned to,
2071 int *partial,
2072 int (*fn)(handle_t *handle,
2073 struct buffer_head *bh));
2074 int do_journal_get_write_access(handle_t *handle,
2075 struct buffer_head *bh);
2076 #define FALL_BACK_TO_NONDELALLOC 1
2077 #define CONVERT_INLINE_DATA 2
2078
2079 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2080 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2081 extern int ext4_setattr(struct dentry *, struct iattr *);
2082 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2083 struct kstat *stat);
2084 extern void ext4_evict_inode(struct inode *);
2085 extern void ext4_clear_inode(struct inode *);
2086 extern int ext4_sync_inode(handle_t *, struct inode *);
2087 extern void ext4_dirty_inode(struct inode *, int);
2088 extern int ext4_change_inode_journal_flag(struct inode *, int);
2089 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2090 extern int ext4_can_truncate(struct inode *inode);
2091 extern void ext4_truncate(struct inode *);
2092 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2093 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2094 extern void ext4_set_inode_flags(struct inode *);
2095 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2096 extern int ext4_alloc_da_blocks(struct inode *inode);
2097 extern void ext4_set_aops(struct inode *inode);
2098 extern int ext4_writepage_trans_blocks(struct inode *);
2099 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2100 extern int ext4_discard_partial_page_buffers(handle_t *handle,
2101 struct address_space *mapping, loff_t from,
2102 loff_t length, int flags);
2103 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2104 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2105 extern void ext4_da_update_reserve_space(struct inode *inode,
2106 int used, int quota_claim);
2107
2108 /* indirect.c */
2109 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2110 struct ext4_map_blocks *map, int flags);
2111 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2112 const struct iovec *iov, loff_t offset,
2113 unsigned long nr_segs);
2114 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2115 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
2116 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2117 extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
2118 ext4_lblk_t first, ext4_lblk_t stop);
2119
2120 /* ioctl.c */
2121 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2122 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2123
2124 /* migrate.c */
2125 extern int ext4_ext_migrate(struct inode *);
2126 extern int ext4_ind_migrate(struct inode *inode);
2127
2128 /* namei.c */
2129 extern int ext4_dirent_csum_verify(struct inode *inode,
2130 struct ext4_dir_entry *dirent);
2131 extern int ext4_orphan_add(handle_t *, struct inode *);
2132 extern int ext4_orphan_del(handle_t *, struct inode *);
2133 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2134 __u32 start_minor_hash, __u32 *next_hash);
2135 extern int search_dir(struct buffer_head *bh,
2136 char *search_buf,
2137 int buf_size,
2138 struct inode *dir,
2139 const struct qstr *d_name,
2140 unsigned int offset,
2141 struct ext4_dir_entry_2 **res_dir);
2142 extern int ext4_generic_delete_entry(handle_t *handle,
2143 struct inode *dir,
2144 struct ext4_dir_entry_2 *de_del,
2145 struct buffer_head *bh,
2146 void *entry_buf,
2147 int buf_size,
2148 int csum_size);
2149
2150 /* resize.c */
2151 extern int ext4_group_add(struct super_block *sb,
2152 struct ext4_new_group_data *input);
2153 extern int ext4_group_extend(struct super_block *sb,
2154 struct ext4_super_block *es,
2155 ext4_fsblk_t n_blocks_count);
2156 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2157
2158 /* super.c */
2159 extern int ext4_calculate_overhead(struct super_block *sb);
2160 extern int ext4_superblock_csum_verify(struct super_block *sb,
2161 struct ext4_super_block *es);
2162 extern void ext4_superblock_csum_set(struct super_block *sb);
2163 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2164 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2165 extern void ext4_kvfree(void *ptr);
2166 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2167 ext4_group_t ngroup);
2168 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2169 char nbuf[16]);
2170 extern __printf(4, 5)
2171 void __ext4_error(struct super_block *, const char *, unsigned int,
2172 const char *, ...);
2173 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2174 __LINE__, ## message)
2175 extern __printf(5, 6)
2176 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2177 const char *, ...);
2178 extern __printf(5, 6)
2179 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2180 const char *, ...);
2181 extern void __ext4_std_error(struct super_block *, const char *,
2182 unsigned int, int);
2183 extern __printf(4, 5)
2184 void __ext4_abort(struct super_block *, const char *, unsigned int,
2185 const char *, ...);
2186 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2187 __LINE__, ## message)
2188 extern __printf(4, 5)
2189 void __ext4_warning(struct super_block *, const char *, unsigned int,
2190 const char *, ...);
2191 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2192 __LINE__, ## message)
2193 extern __printf(3, 4)
2194 void ext4_msg(struct super_block *, const char *, const char *, ...);
2195 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2196 const char *, unsigned int, const char *);
2197 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2198 __LINE__, msg)
2199 extern __printf(7, 8)
2200 void __ext4_grp_locked_error(const char *, unsigned int,
2201 struct super_block *, ext4_group_t,
2202 unsigned long, ext4_fsblk_t,
2203 const char *, ...);
2204 #define ext4_grp_locked_error(sb, grp, message...) \
2205 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2206 extern void ext4_update_dynamic_rev(struct super_block *sb);
2207 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2208 __u32 compat);
2209 extern int ext4_update_rocompat_feature(handle_t *handle,
2210 struct super_block *sb, __u32 rocompat);
2211 extern int ext4_update_incompat_feature(handle_t *handle,
2212 struct super_block *sb, __u32 incompat);
2213 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2214 struct ext4_group_desc *bg);
2215 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2216 struct ext4_group_desc *bg);
2217 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2218 struct ext4_group_desc *bg);
2219 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2220 struct ext4_group_desc *bg);
2221 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2222 struct ext4_group_desc *bg);
2223 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2224 struct ext4_group_desc *bg);
2225 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2226 struct ext4_group_desc *bg);
2227 extern void ext4_block_bitmap_set(struct super_block *sb,
2228 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2229 extern void ext4_inode_bitmap_set(struct super_block *sb,
2230 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2231 extern void ext4_inode_table_set(struct super_block *sb,
2232 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2233 extern void ext4_free_group_clusters_set(struct super_block *sb,
2234 struct ext4_group_desc *bg,
2235 __u32 count);
2236 extern void ext4_free_inodes_set(struct super_block *sb,
2237 struct ext4_group_desc *bg, __u32 count);
2238 extern void ext4_used_dirs_set(struct super_block *sb,
2239 struct ext4_group_desc *bg, __u32 count);
2240 extern void ext4_itable_unused_set(struct super_block *sb,
2241 struct ext4_group_desc *bg, __u32 count);
2242 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2243 struct ext4_group_desc *gdp);
2244 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2245 struct ext4_group_desc *gdp);
2246 extern int ext4_register_li_request(struct super_block *sb,
2247 ext4_group_t first_not_zeroed);
2248
2249 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2250 {
2251 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2252 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2253 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2254 }
2255
2256 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2257 {
2258 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2259 le32_to_cpu(es->s_blocks_count_lo);
2260 }
2261
2262 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2263 {
2264 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2265 le32_to_cpu(es->s_r_blocks_count_lo);
2266 }
2267
2268 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2269 {
2270 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2271 le32_to_cpu(es->s_free_blocks_count_lo);
2272 }
2273
2274 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2275 ext4_fsblk_t blk)
2276 {
2277 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2278 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2279 }
2280
2281 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2282 ext4_fsblk_t blk)
2283 {
2284 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2285 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2286 }
2287
2288 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2289 ext4_fsblk_t blk)
2290 {
2291 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2292 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2293 }
2294
2295 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2296 {
2297 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2298 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2299 le32_to_cpu(raw_inode->i_size_lo);
2300 else
2301 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2302 }
2303
2304 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2305 {
2306 raw_inode->i_size_lo = cpu_to_le32(i_size);
2307 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2308 }
2309
2310 static inline
2311 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2312 ext4_group_t group)
2313 {
2314 struct ext4_group_info ***grp_info;
2315 long indexv, indexh;
2316 grp_info = EXT4_SB(sb)->s_group_info;
2317 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2318 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2319 return grp_info[indexv][indexh];
2320 }
2321
2322 /*
2323 * Reading s_groups_count requires using smp_rmb() afterwards. See
2324 * the locking protocol documented in the comments of ext4_group_add()
2325 * in resize.c
2326 */
2327 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2328 {
2329 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2330
2331 smp_rmb();
2332 return ngroups;
2333 }
2334
2335 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2336 ext4_group_t block_group)
2337 {
2338 return block_group >> sbi->s_log_groups_per_flex;
2339 }
2340
2341 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2342 {
2343 return 1 << sbi->s_log_groups_per_flex;
2344 }
2345
2346 #define ext4_std_error(sb, errno) \
2347 do { \
2348 if ((errno)) \
2349 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2350 } while (0)
2351
2352 #ifdef CONFIG_SMP
2353 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2354 * counters. So we need to make sure we have free clusters more
2355 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2356 */
2357 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2358 #else
2359 #define EXT4_FREECLUSTERS_WATERMARK 0
2360 #endif
2361
2362 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2363 {
2364 /*
2365 * XXX: replace with spinlock if seen contended -bzzz
2366 */
2367 down_write(&EXT4_I(inode)->i_data_sem);
2368 if (newsize > EXT4_I(inode)->i_disksize)
2369 EXT4_I(inode)->i_disksize = newsize;
2370 up_write(&EXT4_I(inode)->i_data_sem);
2371 return ;
2372 }
2373
2374 struct ext4_group_info {
2375 unsigned long bb_state;
2376 struct rb_root bb_free_root;
2377 ext4_grpblk_t bb_first_free; /* first free block */
2378 ext4_grpblk_t bb_free; /* total free blocks */
2379 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2380 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2381 struct list_head bb_prealloc_list;
2382 #ifdef DOUBLE_CHECK
2383 void *bb_bitmap;
2384 #endif
2385 struct rw_semaphore alloc_sem;
2386 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2387 * regions, index is order.
2388 * bb_counters[3] = 5 means
2389 * 5 free 8-block regions. */
2390 };
2391
2392 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2393 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2394
2395 #define EXT4_MB_GRP_NEED_INIT(grp) \
2396 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2397
2398 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2399 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2400 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2401 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2402 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2403 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2404
2405 #define EXT4_MAX_CONTENTION 8
2406 #define EXT4_CONTENTION_THRESHOLD 2
2407
2408 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2409 ext4_group_t group)
2410 {
2411 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2412 }
2413
2414 /*
2415 * Returns true if the filesystem is busy enough that attempts to
2416 * access the block group locks has run into contention.
2417 */
2418 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2419 {
2420 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2421 }
2422
2423 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2424 {
2425 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2426 if (spin_trylock(lock))
2427 /*
2428 * We're able to grab the lock right away, so drop the
2429 * lock contention counter.
2430 */
2431 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2432 else {
2433 /*
2434 * The lock is busy, so bump the contention counter,
2435 * and then wait on the spin lock.
2436 */
2437 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2438 EXT4_MAX_CONTENTION);
2439 spin_lock(lock);
2440 }
2441 }
2442
2443 static inline void ext4_unlock_group(struct super_block *sb,
2444 ext4_group_t group)
2445 {
2446 spin_unlock(ext4_group_lock_ptr(sb, group));
2447 }
2448
2449 /*
2450 * Block validity checking
2451 */
2452 #define ext4_check_indirect_blockref(inode, bh) \
2453 ext4_check_blockref(__func__, __LINE__, inode, \
2454 (__le32 *)(bh)->b_data, \
2455 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2456
2457 #define ext4_ind_check_inode(inode) \
2458 ext4_check_blockref(__func__, __LINE__, inode, \
2459 EXT4_I(inode)->i_data, \
2460 EXT4_NDIR_BLOCKS)
2461
2462 /*
2463 * Inodes and files operations
2464 */
2465
2466 /* dir.c */
2467 extern const struct file_operations ext4_dir_operations;
2468
2469 /* file.c */
2470 extern const struct inode_operations ext4_file_inode_operations;
2471 extern const struct file_operations ext4_file_operations;
2472 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2473 extern void ext4_unwritten_wait(struct inode *inode);
2474
2475 /* inline.c */
2476 extern int ext4_has_inline_data(struct inode *inode);
2477 extern int ext4_get_inline_size(struct inode *inode);
2478 extern int ext4_get_max_inline_size(struct inode *inode);
2479 extern int ext4_find_inline_data_nolock(struct inode *inode);
2480 extern void ext4_write_inline_data(struct inode *inode,
2481 struct ext4_iloc *iloc,
2482 void *buffer, loff_t pos,
2483 unsigned int len);
2484 extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
2485 unsigned int len);
2486 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2487 unsigned int len);
2488 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2489
2490 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2491 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2492 struct inode *inode,
2493 loff_t pos, unsigned len,
2494 unsigned flags,
2495 struct page **pagep);
2496 extern int ext4_write_inline_data_end(struct inode *inode,
2497 loff_t pos, unsigned len,
2498 unsigned copied,
2499 struct page *page);
2500 extern struct buffer_head *
2501 ext4_journalled_write_inline_data(struct inode *inode,
2502 unsigned len,
2503 struct page *page);
2504 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2505 struct inode *inode,
2506 loff_t pos, unsigned len,
2507 unsigned flags,
2508 struct page **pagep,
2509 void **fsdata);
2510 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2511 unsigned len, unsigned copied,
2512 struct page *page);
2513 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2514 struct inode *inode);
2515 extern int ext4_try_create_inline_dir(handle_t *handle,
2516 struct inode *parent,
2517 struct inode *inode);
2518 extern int ext4_read_inline_dir(struct file *filp,
2519 void *dirent, filldir_t filldir,
2520 int *has_inline_data);
2521 extern int htree_inlinedir_to_tree(struct file *dir_file,
2522 struct inode *dir, ext4_lblk_t block,
2523 struct dx_hash_info *hinfo,
2524 __u32 start_hash, __u32 start_minor_hash,
2525 int *has_inline_data);
2526 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2527 const struct qstr *d_name,
2528 struct ext4_dir_entry_2 **res_dir,
2529 int *has_inline_data);
2530 extern int ext4_delete_inline_entry(handle_t *handle,
2531 struct inode *dir,
2532 struct ext4_dir_entry_2 *de_del,
2533 struct buffer_head *bh,
2534 int *has_inline_data);
2535 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2536 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2537 struct ext4_dir_entry_2 **parent_de,
2538 int *retval);
2539 extern int ext4_inline_data_fiemap(struct inode *inode,
2540 struct fiemap_extent_info *fieinfo,
2541 int *has_inline);
2542 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2543 struct inode *inode,
2544 int needed);
2545 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2546
2547 extern int ext4_convert_inline_data(struct inode *inode);
2548
2549 /* namei.c */
2550 extern const struct inode_operations ext4_dir_inode_operations;
2551 extern const struct inode_operations ext4_special_inode_operations;
2552 extern struct dentry *ext4_get_parent(struct dentry *child);
2553 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2554 struct ext4_dir_entry_2 *de,
2555 int blocksize, int csum_size,
2556 unsigned int parent_ino, int dotdot_real_len);
2557 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2558 unsigned int blocksize);
2559 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2560 struct inode *inode,
2561 struct buffer_head *bh);
2562 #define S_SHIFT 12
2563 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2564 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2565 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2566 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2567 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2568 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2569 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2570 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2571 };
2572
2573 static inline void ext4_set_de_type(struct super_block *sb,
2574 struct ext4_dir_entry_2 *de,
2575 umode_t mode) {
2576 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2577 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2578 }
2579
2580
2581 /* symlink.c */
2582 extern const struct inode_operations ext4_symlink_inode_operations;
2583 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2584
2585 /* block_validity */
2586 extern void ext4_release_system_zone(struct super_block *sb);
2587 extern int ext4_setup_system_zone(struct super_block *sb);
2588 extern int __init ext4_init_system_zone(void);
2589 extern void ext4_exit_system_zone(void);
2590 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2591 ext4_fsblk_t start_blk,
2592 unsigned int count);
2593 extern int ext4_check_blockref(const char *, unsigned int,
2594 struct inode *, __le32 *, unsigned int);
2595
2596 /* extents.c */
2597 struct ext4_ext_path;
2598 struct ext4_extent;
2599
2600 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2601 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2602 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2603 int chunk);
2604 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2605 struct ext4_map_blocks *map, int flags);
2606 extern void ext4_ext_truncate(handle_t *, struct inode *);
2607 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2608 ext4_lblk_t end);
2609 extern void ext4_ext_init(struct super_block *);
2610 extern void ext4_ext_release(struct super_block *);
2611 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2612 loff_t len);
2613 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2614 ssize_t len);
2615 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2616 struct ext4_map_blocks *map, int flags);
2617 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2618 ext4_lblk_t lblocks);
2619 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2620 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2621 int num,
2622 struct ext4_ext_path *path);
2623 extern int ext4_can_extents_be_merged(struct inode *inode,
2624 struct ext4_extent *ex1,
2625 struct ext4_extent *ex2);
2626 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2627 struct ext4_ext_path *,
2628 struct ext4_extent *, int);
2629 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2630 struct ext4_ext_path *);
2631 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2632 extern int ext4_ext_check_inode(struct inode *inode);
2633 extern int ext4_find_delalloc_range(struct inode *inode,
2634 ext4_lblk_t lblk_start,
2635 ext4_lblk_t lblk_end);
2636 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2637 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2638 __u64 start, __u64 len);
2639
2640
2641 /* move_extent.c */
2642 extern void ext4_double_down_write_data_sem(struct inode *first,
2643 struct inode *second);
2644 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2645 struct inode *donor_inode);
2646 void ext4_inode_double_lock(struct inode *inode1, struct inode *inode2);
2647 void ext4_inode_double_unlock(struct inode *inode1, struct inode *inode2);
2648 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2649 __u64 start_orig, __u64 start_donor,
2650 __u64 len, __u64 *moved_len);
2651
2652 /* page-io.c */
2653 extern int __init ext4_init_pageio(void);
2654 extern void ext4_exit_pageio(void);
2655 extern void ext4_ioend_shutdown(struct inode *);
2656 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2657 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2658 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2659 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2660 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2661 struct writeback_control *wbc);
2662 extern void ext4_end_io_work(struct work_struct *work);
2663 extern void ext4_io_submit(struct ext4_io_submit *io);
2664 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2665 struct page *page,
2666 int len,
2667 struct writeback_control *wbc);
2668
2669 /* mmp.c */
2670 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2671 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2672 extern int ext4_mmp_csum_verify(struct super_block *sb,
2673 struct mmp_struct *mmp);
2674
2675 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2676 enum ext4_state_bits {
2677 BH_Uninit /* blocks are allocated but uninitialized on disk */
2678 = BH_JBDPrivateStart,
2679 BH_AllocFromCluster, /* allocated blocks were part of already
2680 * allocated cluster. Note that this flag will
2681 * never, ever appear in a buffer_head's state
2682 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2683 * this is used. */
2684 };
2685
2686 BUFFER_FNS(Uninit, uninit)
2687 TAS_BUFFER_FNS(Uninit, uninit)
2688
2689 /*
2690 * Add new method to test whether block and inode bitmaps are properly
2691 * initialized. With uninit_bg reading the block from disk is not enough
2692 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2693 */
2694 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2695
2696 static inline int bitmap_uptodate(struct buffer_head *bh)
2697 {
2698 return (buffer_uptodate(bh) &&
2699 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2700 }
2701 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2702 {
2703 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2704 }
2705
2706 /*
2707 * Disable DIO read nolock optimization, so new dioreaders will be forced
2708 * to grab i_mutex
2709 */
2710 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2711 {
2712 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2713 smp_mb();
2714 }
2715 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2716 {
2717 smp_mb();
2718 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2719 }
2720
2721 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2722
2723 /* For ioend & aio unwritten conversion wait queues */
2724 #define EXT4_WQ_HASH_SZ 37
2725 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2726 EXT4_WQ_HASH_SZ])
2727 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2728 EXT4_WQ_HASH_SZ])
2729 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2730 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2731
2732 #define EXT4_RESIZING 0
2733 extern int ext4_resize_begin(struct super_block *sb);
2734 extern void ext4_resize_end(struct super_block *sb);
2735
2736 #endif /* __KERNEL__ */
2737
2738 #endif /* _EXT4_H */
kernel source for telekom puls (alcatel/mediatek)