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[deliverable/linux.git] / fs / ext4 / ext4.h
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <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
125 struct ext4_allocation_request {
126 /* target inode for block we're allocating */
127 struct inode *inode;
128 /* how many blocks we want to allocate */
129 unsigned int len;
130 /* logical block in target inode */
131 ext4_lblk_t logical;
132 /* the closest logical allocated block to the left */
133 ext4_lblk_t lleft;
134 /* the closest logical allocated block to the right */
135 ext4_lblk_t lright;
136 /* phys. target (a hint) */
137 ext4_fsblk_t goal;
138 /* phys. block for the closest logical allocated block to the left */
139 ext4_fsblk_t pleft;
140 /* phys. block for the closest logical allocated block to the right */
141 ext4_fsblk_t pright;
142 /* flags. see above EXT4_MB_HINT_* */
143 unsigned int flags;
144 };
145
146 /*
147 * Logical to physical block mapping, used by ext4_map_blocks()
148 *
149 * This structure is used to pass requests into ext4_map_blocks() as
150 * well as to store the information returned by ext4_map_blocks(). It
151 * takes less room on the stack than a struct buffer_head.
152 */
153 #define EXT4_MAP_NEW (1 << BH_New)
154 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
157 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
158 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
159 * ext4_map_blocks wants to know whether or not the underlying cluster has
160 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
161 * the requested mapping was from previously mapped (or delayed allocated)
162 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
163 * should never appear on buffer_head's state flags.
164 */
165 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
166 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
168 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
169
170 struct ext4_map_blocks {
171 ext4_fsblk_t m_pblk;
172 ext4_lblk_t m_lblk;
173 unsigned int m_len;
174 unsigned int m_flags;
175 };
176
177 /*
178 * For delayed allocation tracking
179 */
180 struct mpage_da_data {
181 struct inode *inode;
182 sector_t b_blocknr; /* start block number of extent */
183 size_t b_size; /* size of extent */
184 unsigned long b_state; /* state of the extent */
185 unsigned long first_page, next_page; /* extent of pages */
186 struct writeback_control *wbc;
187 int io_done;
188 int pages_written;
189 int retval;
190 };
191
192 /*
193 * Flags for ext4_io_end->flags
194 */
195 #define EXT4_IO_END_UNWRITTEN 0x0001
196 #define EXT4_IO_END_ERROR 0x0002
197 #define EXT4_IO_END_QUEUED 0x0004
198 #define EXT4_IO_END_DIRECT 0x0008
199
200 struct ext4_io_page {
201 struct page *p_page;
202 atomic_t p_count;
203 };
204
205 #define MAX_IO_PAGES 128
206
207 /*
208 * For converting uninitialized extents on a work queue.
209 *
210 * 'page' is only used from the writepage() path; 'pages' is only used for
211 * buffered writes; they are used to keep page references until conversion
212 * takes place. For AIO/DIO, neither field is filled in.
213 */
214 typedef struct ext4_io_end {
215 struct list_head list; /* per-file finished IO list */
216 struct inode *inode; /* file being written to */
217 unsigned int flag; /* unwritten or not */
218 struct page *page; /* for writepage() path */
219 loff_t offset; /* offset in the file */
220 ssize_t size; /* size of the extent */
221 struct work_struct work; /* data work queue */
222 struct kiocb *iocb; /* iocb struct for AIO */
223 int result; /* error value for AIO */
224 int num_io_pages; /* for writepages() */
225 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */
226 } ext4_io_end_t;
227
228 struct ext4_io_submit {
229 int io_op;
230 struct bio *io_bio;
231 ext4_io_end_t *io_end;
232 struct ext4_io_page *io_page;
233 sector_t io_next_block;
234 };
235
236 /*
237 * Special inodes numbers
238 */
239 #define EXT4_BAD_INO 1 /* Bad blocks inode */
240 #define EXT4_ROOT_INO 2 /* Root inode */
241 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
242 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
243 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
244 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
245 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
246 #define EXT4_JOURNAL_INO 8 /* Journal inode */
247
248 /* First non-reserved inode for old ext4 filesystems */
249 #define EXT4_GOOD_OLD_FIRST_INO 11
250
251 /*
252 * Maximal count of links to a file
253 */
254 #define EXT4_LINK_MAX 65000
255
256 /*
257 * Macro-instructions used to manage several block sizes
258 */
259 #define EXT4_MIN_BLOCK_SIZE 1024
260 #define EXT4_MAX_BLOCK_SIZE 65536
261 #define EXT4_MIN_BLOCK_LOG_SIZE 10
262 #define EXT4_MAX_BLOCK_LOG_SIZE 16
263 #ifdef __KERNEL__
264 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
265 #else
266 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
267 #endif
268 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
269 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
270 EXT4_SB(s)->s_cluster_bits)
271 #ifdef __KERNEL__
272 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
273 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
274 #else
275 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
276 #endif
277 #ifdef __KERNEL__
278 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
279 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
280 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
281 #else
282 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
283 EXT4_GOOD_OLD_INODE_SIZE : \
284 (s)->s_inode_size)
285 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
286 EXT4_GOOD_OLD_FIRST_INO : \
287 (s)->s_first_ino)
288 #endif
289 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
290
291 /* Translate a block number to a cluster number */
292 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
293 /* Translate a cluster number to a block number */
294 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
295 /* Translate # of blks to # of clusters */
296 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
297 (sbi)->s_cluster_bits)
298
299 /*
300 * Structure of a blocks group descriptor
301 */
302 struct ext4_group_desc
303 {
304 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
305 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
306 __le32 bg_inode_table_lo; /* Inodes table block */
307 __le16 bg_free_blocks_count_lo;/* Free blocks count */
308 __le16 bg_free_inodes_count_lo;/* Free inodes count */
309 __le16 bg_used_dirs_count_lo; /* Directories count */
310 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
311 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
312 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
313 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
314 __le16 bg_itable_unused_lo; /* Unused inodes count */
315 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
316 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
317 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
318 __le32 bg_inode_table_hi; /* Inodes table block MSB */
319 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
320 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
321 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
322 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
323 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
324 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
325 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
326 __u32 bg_reserved;
327 };
328
329 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
330 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
331 sizeof(__le16))
332 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
333 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
334 sizeof(__le16))
335
336 /*
337 * Structure of a flex block group info
338 */
339
340 struct flex_groups {
341 atomic_t free_inodes;
342 atomic_t free_clusters;
343 atomic_t used_dirs;
344 };
345
346 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
347 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
348 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
349
350 /*
351 * Macro-instructions used to manage group descriptors
352 */
353 #define EXT4_MIN_DESC_SIZE 32
354 #define EXT4_MIN_DESC_SIZE_64BIT 64
355 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
356 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
357 #ifdef __KERNEL__
358 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
359 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
360 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
361 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
362 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
363 #else
364 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
365 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
366 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
367 #endif
368
369 /*
370 * Constants relative to the data blocks
371 */
372 #define EXT4_NDIR_BLOCKS 12
373 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
374 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
375 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
376 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
377
378 /*
379 * Inode flags
380 */
381 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
382 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
383 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
384 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
385 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
386 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
387 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
388 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
389 /* Reserved for compression usage... */
390 #define EXT4_DIRTY_FL 0x00000100
391 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
392 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
393 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
394 /* End compression flags --- maybe not all used */
395 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
396 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
397 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
398 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
399 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
400 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
401 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
402 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
403 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
404 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
405 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
406 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
407
408 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
409 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
410
411 /* Flags that should be inherited by new inodes from their parent. */
412 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
413 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
414 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
415 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
416
417 /* Flags that are appropriate for regular files (all but dir-specific ones). */
418 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
419
420 /* Flags that are appropriate for non-directories/regular files. */
421 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
422
423 /* Mask out flags that are inappropriate for the given type of inode. */
424 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
425 {
426 if (S_ISDIR(mode))
427 return flags;
428 else if (S_ISREG(mode))
429 return flags & EXT4_REG_FLMASK;
430 else
431 return flags & EXT4_OTHER_FLMASK;
432 }
433
434 /*
435 * Inode flags used for atomic set/get
436 */
437 enum {
438 EXT4_INODE_SECRM = 0, /* Secure deletion */
439 EXT4_INODE_UNRM = 1, /* Undelete */
440 EXT4_INODE_COMPR = 2, /* Compress file */
441 EXT4_INODE_SYNC = 3, /* Synchronous updates */
442 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
443 EXT4_INODE_APPEND = 5, /* writes to file may only append */
444 EXT4_INODE_NODUMP = 6, /* do not dump file */
445 EXT4_INODE_NOATIME = 7, /* do not update atime */
446 /* Reserved for compression usage... */
447 EXT4_INODE_DIRTY = 8,
448 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
449 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
450 EXT4_INODE_ECOMPR = 11, /* Compression error */
451 /* End compression flags --- maybe not all used */
452 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
453 EXT4_INODE_IMAGIC = 13, /* AFS directory */
454 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
455 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
456 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
457 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
458 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
459 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
460 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
461 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
462 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
463 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
464 };
465
466 /*
467 * Since it's pretty easy to mix up bit numbers and hex values, we use a
468 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
469 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
470 * any extra space in the compiled kernel image, otherwise, the build will fail.
471 * It's important that these values are the same, since we are using
472 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
473 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
474 * values found in ext2, ext3 and ext4 filesystems, and of course the values
475 * defined in e2fsprogs.
476 *
477 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
478 */
479 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
480 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
481
482 static inline void ext4_check_flag_values(void)
483 {
484 CHECK_FLAG_VALUE(SECRM);
485 CHECK_FLAG_VALUE(UNRM);
486 CHECK_FLAG_VALUE(COMPR);
487 CHECK_FLAG_VALUE(SYNC);
488 CHECK_FLAG_VALUE(IMMUTABLE);
489 CHECK_FLAG_VALUE(APPEND);
490 CHECK_FLAG_VALUE(NODUMP);
491 CHECK_FLAG_VALUE(NOATIME);
492 CHECK_FLAG_VALUE(DIRTY);
493 CHECK_FLAG_VALUE(COMPRBLK);
494 CHECK_FLAG_VALUE(NOCOMPR);
495 CHECK_FLAG_VALUE(ECOMPR);
496 CHECK_FLAG_VALUE(INDEX);
497 CHECK_FLAG_VALUE(IMAGIC);
498 CHECK_FLAG_VALUE(JOURNAL_DATA);
499 CHECK_FLAG_VALUE(NOTAIL);
500 CHECK_FLAG_VALUE(DIRSYNC);
501 CHECK_FLAG_VALUE(TOPDIR);
502 CHECK_FLAG_VALUE(HUGE_FILE);
503 CHECK_FLAG_VALUE(EXTENTS);
504 CHECK_FLAG_VALUE(EA_INODE);
505 CHECK_FLAG_VALUE(EOFBLOCKS);
506 CHECK_FLAG_VALUE(INLINE_DATA);
507 CHECK_FLAG_VALUE(RESERVED);
508 }
509
510 /* Used to pass group descriptor data when online resize is done */
511 struct ext4_new_group_input {
512 __u32 group; /* Group number for this data */
513 __u64 block_bitmap; /* Absolute block number of block bitmap */
514 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
515 __u64 inode_table; /* Absolute block number of inode table start */
516 __u32 blocks_count; /* Total number of blocks in this group */
517 __u16 reserved_blocks; /* Number of reserved blocks in this group */
518 __u16 unused;
519 };
520
521 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
522 struct compat_ext4_new_group_input {
523 u32 group;
524 compat_u64 block_bitmap;
525 compat_u64 inode_bitmap;
526 compat_u64 inode_table;
527 u32 blocks_count;
528 u16 reserved_blocks;
529 u16 unused;
530 };
531 #endif
532
533 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
534 struct ext4_new_group_data {
535 __u32 group;
536 __u64 block_bitmap;
537 __u64 inode_bitmap;
538 __u64 inode_table;
539 __u32 blocks_count;
540 __u16 reserved_blocks;
541 __u16 unused;
542 __u32 free_blocks_count;
543 };
544
545 /* Indexes used to index group tables in ext4_new_group_data */
546 enum {
547 BLOCK_BITMAP = 0, /* block bitmap */
548 INODE_BITMAP, /* inode bitmap */
549 INODE_TABLE, /* inode tables */
550 GROUP_TABLE_COUNT,
551 };
552
553 /*
554 * Flags used by ext4_map_blocks()
555 */
556 /* Allocate any needed blocks and/or convert an unitialized
557 extent to be an initialized ext4 */
558 #define EXT4_GET_BLOCKS_CREATE 0x0001
559 /* Request the creation of an unitialized extent */
560 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
561 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
562 EXT4_GET_BLOCKS_CREATE)
563 /* Caller is from the delayed allocation writeout path,
564 so set the magic i_delalloc_reserve_flag after taking the
565 inode allocation semaphore for */
566 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
567 /* caller is from the direct IO path, request to creation of an
568 unitialized extents if not allocated, split the uninitialized
569 extent if blocks has been preallocated already*/
570 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
571 #define EXT4_GET_BLOCKS_CONVERT 0x0010
572 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
573 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
574 /* Convert extent to initialized after IO complete */
575 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
576 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
577 /* Punch out blocks of an extent */
578 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
579 /* Don't normalize allocation size (used for fallocate) */
580 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
581 /* Request will not result in inode size update (user for fallocate) */
582 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
583 /* Do not take i_data_sem locking in ext4_map_blocks */
584 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
585
586 /*
587 * Flags used by ext4_free_blocks
588 */
589 #define EXT4_FREE_BLOCKS_METADATA 0x0001
590 #define EXT4_FREE_BLOCKS_FORGET 0x0002
591 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
592 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
593 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
594 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
595
596 /*
597 * Flags used by ext4_discard_partial_page_buffers
598 */
599 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
600
601 /*
602 * ioctl commands
603 */
604 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
605 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
606 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
607 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
608 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
609 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
610 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
611 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
612 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
613 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
614 #define EXT4_IOC_MIGRATE _IO('f', 9)
615 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
616 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
617 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
618 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
619 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
620
621 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
622 /*
623 * ioctl commands in 32 bit emulation
624 */
625 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
626 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
627 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
628 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
629 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
630 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
631 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
632 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
633 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
634 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
635 #endif
636
637 /* Max physical block we can address w/o extents */
638 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
639
640 /*
641 * Structure of an inode on the disk
642 */
643 struct ext4_inode {
644 __le16 i_mode; /* File mode */
645 __le16 i_uid; /* Low 16 bits of Owner Uid */
646 __le32 i_size_lo; /* Size in bytes */
647 __le32 i_atime; /* Access time */
648 __le32 i_ctime; /* Inode Change time */
649 __le32 i_mtime; /* Modification time */
650 __le32 i_dtime; /* Deletion Time */
651 __le16 i_gid; /* Low 16 bits of Group Id */
652 __le16 i_links_count; /* Links count */
653 __le32 i_blocks_lo; /* Blocks count */
654 __le32 i_flags; /* File flags */
655 union {
656 struct {
657 __le32 l_i_version;
658 } linux1;
659 struct {
660 __u32 h_i_translator;
661 } hurd1;
662 struct {
663 __u32 m_i_reserved1;
664 } masix1;
665 } osd1; /* OS dependent 1 */
666 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
667 __le32 i_generation; /* File version (for NFS) */
668 __le32 i_file_acl_lo; /* File ACL */
669 __le32 i_size_high;
670 __le32 i_obso_faddr; /* Obsoleted fragment address */
671 union {
672 struct {
673 __le16 l_i_blocks_high; /* were l_i_reserved1 */
674 __le16 l_i_file_acl_high;
675 __le16 l_i_uid_high; /* these 2 fields */
676 __le16 l_i_gid_high; /* were reserved2[0] */
677 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
678 __le16 l_i_reserved;
679 } linux2;
680 struct {
681 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
682 __u16 h_i_mode_high;
683 __u16 h_i_uid_high;
684 __u16 h_i_gid_high;
685 __u32 h_i_author;
686 } hurd2;
687 struct {
688 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
689 __le16 m_i_file_acl_high;
690 __u32 m_i_reserved2[2];
691 } masix2;
692 } osd2; /* OS dependent 2 */
693 __le16 i_extra_isize;
694 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
695 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
696 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
697 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
698 __le32 i_crtime; /* File Creation time */
699 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
700 __le32 i_version_hi; /* high 32 bits for 64-bit version */
701 };
702
703 struct move_extent {
704 __u32 reserved; /* should be zero */
705 __u32 donor_fd; /* donor file descriptor */
706 __u64 orig_start; /* logical start offset in block for orig */
707 __u64 donor_start; /* logical start offset in block for donor */
708 __u64 len; /* block length to be moved */
709 __u64 moved_len; /* moved block length */
710 };
711
712 #define EXT4_EPOCH_BITS 2
713 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
714 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
715
716 /*
717 * Extended fields will fit into an inode if the filesystem was formatted
718 * with large inodes (-I 256 or larger) and there are not currently any EAs
719 * consuming all of the available space. For new inodes we always reserve
720 * enough space for the kernel's known extended fields, but for inodes
721 * created with an old kernel this might not have been the case. None of
722 * the extended inode fields is critical for correct filesystem operation.
723 * This macro checks if a certain field fits in the inode. Note that
724 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
725 */
726 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
727 ((offsetof(typeof(*ext4_inode), field) + \
728 sizeof((ext4_inode)->field)) \
729 <= (EXT4_GOOD_OLD_INODE_SIZE + \
730 (einode)->i_extra_isize)) \
731
732 static inline __le32 ext4_encode_extra_time(struct timespec *time)
733 {
734 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
735 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
736 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
737 }
738
739 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
740 {
741 if (sizeof(time->tv_sec) > 4)
742 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
743 << 32;
744 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
745 }
746
747 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
748 do { \
749 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
750 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
751 (raw_inode)->xtime ## _extra = \
752 ext4_encode_extra_time(&(inode)->xtime); \
753 } while (0)
754
755 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
756 do { \
757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
758 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
759 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
760 (raw_inode)->xtime ## _extra = \
761 ext4_encode_extra_time(&(einode)->xtime); \
762 } while (0)
763
764 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
765 do { \
766 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
767 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
768 ext4_decode_extra_time(&(inode)->xtime, \
769 raw_inode->xtime ## _extra); \
770 else \
771 (inode)->xtime.tv_nsec = 0; \
772 } while (0)
773
774 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
775 do { \
776 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
777 (einode)->xtime.tv_sec = \
778 (signed)le32_to_cpu((raw_inode)->xtime); \
779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
780 ext4_decode_extra_time(&(einode)->xtime, \
781 raw_inode->xtime ## _extra); \
782 else \
783 (einode)->xtime.tv_nsec = 0; \
784 } while (0)
785
786 #define i_disk_version osd1.linux1.l_i_version
787
788 #if defined(__KERNEL__) || defined(__linux__)
789 #define i_reserved1 osd1.linux1.l_i_reserved1
790 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
791 #define i_blocks_high osd2.linux2.l_i_blocks_high
792 #define i_uid_low i_uid
793 #define i_gid_low i_gid
794 #define i_uid_high osd2.linux2.l_i_uid_high
795 #define i_gid_high osd2.linux2.l_i_gid_high
796 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
797
798 #elif defined(__GNU__)
799
800 #define i_translator osd1.hurd1.h_i_translator
801 #define i_uid_high osd2.hurd2.h_i_uid_high
802 #define i_gid_high osd2.hurd2.h_i_gid_high
803 #define i_author osd2.hurd2.h_i_author
804
805 #elif defined(__masix__)
806
807 #define i_reserved1 osd1.masix1.m_i_reserved1
808 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
809 #define i_reserved2 osd2.masix2.m_i_reserved2
810
811 #endif /* defined(__KERNEL__) || defined(__linux__) */
812
813 /*
814 * storage for cached extent
815 * If ec_len == 0, then the cache is invalid.
816 * If ec_start == 0, then the cache represents a gap (null mapping)
817 */
818 struct ext4_ext_cache {
819 ext4_fsblk_t ec_start;
820 ext4_lblk_t ec_block;
821 __u32 ec_len; /* must be 32bit to return holes */
822 };
823
824 #include "extents_status.h"
825
826 /*
827 * fourth extended file system inode data in memory
828 */
829 struct ext4_inode_info {
830 __le32 i_data[15]; /* unconverted */
831 __u32 i_dtime;
832 ext4_fsblk_t i_file_acl;
833
834 /*
835 * i_block_group is the number of the block group which contains
836 * this file's inode. Constant across the lifetime of the inode,
837 * it is ued for making block allocation decisions - we try to
838 * place a file's data blocks near its inode block, and new inodes
839 * near to their parent directory's inode.
840 */
841 ext4_group_t i_block_group;
842 ext4_lblk_t i_dir_start_lookup;
843 #if (BITS_PER_LONG < 64)
844 unsigned long i_state_flags; /* Dynamic state flags */
845 #endif
846 unsigned long i_flags;
847
848 /*
849 * Extended attributes can be read independently of the main file
850 * data. Taking i_mutex even when reading would cause contention
851 * between readers of EAs and writers of regular file data, so
852 * instead we synchronize on xattr_sem when reading or changing
853 * EAs.
854 */
855 struct rw_semaphore xattr_sem;
856
857 struct list_head i_orphan; /* unlinked but open inodes */
858
859 /*
860 * i_disksize keeps track of what the inode size is ON DISK, not
861 * in memory. During truncate, i_size is set to the new size by
862 * the VFS prior to calling ext4_truncate(), but the filesystem won't
863 * set i_disksize to 0 until the truncate is actually under way.
864 *
865 * The intent is that i_disksize always represents the blocks which
866 * are used by this file. This allows recovery to restart truncate
867 * on orphans if we crash during truncate. We actually write i_disksize
868 * into the on-disk inode when writing inodes out, instead of i_size.
869 *
870 * The only time when i_disksize and i_size may be different is when
871 * a truncate is in progress. The only things which change i_disksize
872 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
873 */
874 loff_t i_disksize;
875
876 /*
877 * i_data_sem is for serialising ext4_truncate() against
878 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
879 * data tree are chopped off during truncate. We can't do that in
880 * ext4 because whenever we perform intermediate commits during
881 * truncate, the inode and all the metadata blocks *must* be in a
882 * consistent state which allows truncation of the orphans to restart
883 * during recovery. Hence we must fix the get_block-vs-truncate race
884 * by other means, so we have i_data_sem.
885 */
886 struct rw_semaphore i_data_sem;
887 struct inode vfs_inode;
888 struct jbd2_inode *jinode;
889
890 struct ext4_ext_cache i_cached_extent;
891 /*
892 * File creation time. Its function is same as that of
893 * struct timespec i_{a,c,m}time in the generic inode.
894 */
895 struct timespec i_crtime;
896
897 /* mballoc */
898 struct list_head i_prealloc_list;
899 spinlock_t i_prealloc_lock;
900
901 /* extents status tree */
902 struct ext4_es_tree i_es_tree;
903 rwlock_t i_es_lock;
904
905 /* ialloc */
906 ext4_group_t i_last_alloc_group;
907
908 /* allocation reservation info for delalloc */
909 /* In case of bigalloc, these refer to clusters rather than blocks */
910 unsigned int i_reserved_data_blocks;
911 unsigned int i_reserved_meta_blocks;
912 unsigned int i_allocated_meta_blocks;
913 ext4_lblk_t i_da_metadata_calc_last_lblock;
914 int i_da_metadata_calc_len;
915
916 /* on-disk additional length */
917 __u16 i_extra_isize;
918
919 /* Indicate the inline data space. */
920 u16 i_inline_off;
921 u16 i_inline_size;
922
923 #ifdef CONFIG_QUOTA
924 /* quota space reservation, managed internally by quota code */
925 qsize_t i_reserved_quota;
926 #endif
927
928 /* completed IOs that might need unwritten extents handling */
929 struct list_head i_completed_io_list;
930 spinlock_t i_completed_io_lock;
931 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
932 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
933
934 spinlock_t i_block_reservation_lock;
935
936 /*
937 * Transactions that contain inode's metadata needed to complete
938 * fsync and fdatasync, respectively.
939 */
940 tid_t i_sync_tid;
941 tid_t i_datasync_tid;
942
943 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
944 __u32 i_csum_seed;
945 };
946
947 /*
948 * File system states
949 */
950 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
951 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
952 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
953
954 /*
955 * Misc. filesystem flags
956 */
957 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
958 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
959 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
960
961 /*
962 * Mount flags
963 */
964 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
965 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
966 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
967 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
968 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
969 #define EXT4_MOUNT_ERRORS_MASK 0x00070
970 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
971 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
972 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
973 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
974 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
975 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
976 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
977 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
978 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
979 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
980 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
981 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
982 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
983 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
984 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
985 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
986 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
987 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
988 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
989 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
990 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
991 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
992 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
993 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
994
995 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
996 specified delalloc */
997
998 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
999 ~EXT4_MOUNT_##opt
1000 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1001 EXT4_MOUNT_##opt
1002 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1003 EXT4_MOUNT_##opt)
1004
1005 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1006 ~EXT4_MOUNT2_##opt
1007 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1008 EXT4_MOUNT2_##opt
1009 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1010 EXT4_MOUNT2_##opt)
1011
1012 #define ext4_test_and_set_bit __test_and_set_bit_le
1013 #define ext4_set_bit __set_bit_le
1014 #define ext4_set_bit_atomic ext2_set_bit_atomic
1015 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1016 #define ext4_clear_bit __clear_bit_le
1017 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1018 #define ext4_test_bit test_bit_le
1019 #define ext4_find_next_zero_bit find_next_zero_bit_le
1020 #define ext4_find_next_bit find_next_bit_le
1021
1022 extern void ext4_set_bits(void *bm, int cur, int len);
1023
1024 /*
1025 * Maximal mount counts between two filesystem checks
1026 */
1027 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1028 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1029
1030 /*
1031 * Behaviour when detecting errors
1032 */
1033 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1034 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1035 #define EXT4_ERRORS_PANIC 3 /* Panic */
1036 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1037
1038 /* Metadata checksum algorithm codes */
1039 #define EXT4_CRC32C_CHKSUM 1
1040
1041 /*
1042 * Structure of the super block
1043 */
1044 struct ext4_super_block {
1045 /*00*/ __le32 s_inodes_count; /* Inodes count */
1046 __le32 s_blocks_count_lo; /* Blocks count */
1047 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1048 __le32 s_free_blocks_count_lo; /* Free blocks count */
1049 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1050 __le32 s_first_data_block; /* First Data Block */
1051 __le32 s_log_block_size; /* Block size */
1052 __le32 s_log_cluster_size; /* Allocation cluster size */
1053 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1054 __le32 s_clusters_per_group; /* # Clusters per group */
1055 __le32 s_inodes_per_group; /* # Inodes per group */
1056 __le32 s_mtime; /* Mount time */
1057 /*30*/ __le32 s_wtime; /* Write time */
1058 __le16 s_mnt_count; /* Mount count */
1059 __le16 s_max_mnt_count; /* Maximal mount count */
1060 __le16 s_magic; /* Magic signature */
1061 __le16 s_state; /* File system state */
1062 __le16 s_errors; /* Behaviour when detecting errors */
1063 __le16 s_minor_rev_level; /* minor revision level */
1064 /*40*/ __le32 s_lastcheck; /* time of last check */
1065 __le32 s_checkinterval; /* max. time between checks */
1066 __le32 s_creator_os; /* OS */
1067 __le32 s_rev_level; /* Revision level */
1068 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1069 __le16 s_def_resgid; /* Default gid for reserved blocks */
1070 /*
1071 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1072 *
1073 * Note: the difference between the compatible feature set and
1074 * the incompatible feature set is that if there is a bit set
1075 * in the incompatible feature set that the kernel doesn't
1076 * know about, it should refuse to mount the filesystem.
1077 *
1078 * e2fsck's requirements are more strict; if it doesn't know
1079 * about a feature in either the compatible or incompatible
1080 * feature set, it must abort and not try to meddle with
1081 * things it doesn't understand...
1082 */
1083 __le32 s_first_ino; /* First non-reserved inode */
1084 __le16 s_inode_size; /* size of inode structure */
1085 __le16 s_block_group_nr; /* block group # of this superblock */
1086 __le32 s_feature_compat; /* compatible feature set */
1087 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1088 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1089 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1090 /*78*/ char s_volume_name[16]; /* volume name */
1091 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1092 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1093 /*
1094 * Performance hints. Directory preallocation should only
1095 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1096 */
1097 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1098 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1099 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1100 /*
1101 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1102 */
1103 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1104 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1105 __le32 s_journal_dev; /* device number of journal file */
1106 __le32 s_last_orphan; /* start of list of inodes to delete */
1107 __le32 s_hash_seed[4]; /* HTREE hash seed */
1108 __u8 s_def_hash_version; /* Default hash version to use */
1109 __u8 s_jnl_backup_type;
1110 __le16 s_desc_size; /* size of group descriptor */
1111 /*100*/ __le32 s_default_mount_opts;
1112 __le32 s_first_meta_bg; /* First metablock block group */
1113 __le32 s_mkfs_time; /* When the filesystem was created */
1114 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1115 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1116 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1117 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1118 __le32 s_free_blocks_count_hi; /* Free blocks count */
1119 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1120 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1121 __le32 s_flags; /* Miscellaneous flags */
1122 __le16 s_raid_stride; /* RAID stride */
1123 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1124 __le64 s_mmp_block; /* Block for multi-mount protection */
1125 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1126 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1127 __u8 s_checksum_type; /* metadata checksum algorithm used */
1128 __le16 s_reserved_pad;
1129 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1130 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1131 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1132 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1133 snapshot's future use */
1134 __le32 s_snapshot_list; /* inode number of the head of the
1135 on-disk snapshot list */
1136 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1137 __le32 s_error_count; /* number of fs errors */
1138 __le32 s_first_error_time; /* first time an error happened */
1139 __le32 s_first_error_ino; /* inode involved in first error */
1140 __le64 s_first_error_block; /* block involved of first error */
1141 __u8 s_first_error_func[32]; /* function where the error happened */
1142 __le32 s_first_error_line; /* line number where error happened */
1143 __le32 s_last_error_time; /* most recent time of an error */
1144 __le32 s_last_error_ino; /* inode involved in last error */
1145 __le32 s_last_error_line; /* line number where error happened */
1146 __le64 s_last_error_block; /* block involved of last error */
1147 __u8 s_last_error_func[32]; /* function where the error happened */
1148 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1149 __u8 s_mount_opts[64];
1150 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1151 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1152 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1153 __le32 s_reserved[108]; /* Padding to the end of the block */
1154 __le32 s_checksum; /* crc32c(superblock) */
1155 };
1156
1157 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1158
1159 #ifdef __KERNEL__
1160
1161 /*
1162 * run-time mount flags
1163 */
1164 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1165 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1166
1167 /*
1168 * fourth extended-fs super-block data in memory
1169 */
1170 struct ext4_sb_info {
1171 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1172 unsigned long s_inodes_per_block;/* Number of inodes per block */
1173 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1174 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1175 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1176 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1177 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1178 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1179 ext4_group_t s_groups_count; /* Number of groups in the fs */
1180 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1181 unsigned long s_overhead; /* # of fs overhead clusters */
1182 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1183 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1184 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1185 struct buffer_head * s_sbh; /* Buffer containing the super block */
1186 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1187 struct buffer_head **s_group_desc;
1188 unsigned int s_mount_opt;
1189 unsigned int s_mount_opt2;
1190 unsigned int s_mount_flags;
1191 unsigned int s_def_mount_opt;
1192 ext4_fsblk_t s_sb_block;
1193 kuid_t s_resuid;
1194 kgid_t s_resgid;
1195 unsigned short s_mount_state;
1196 unsigned short s_pad;
1197 int s_addr_per_block_bits;
1198 int s_desc_per_block_bits;
1199 int s_inode_size;
1200 int s_first_ino;
1201 unsigned int s_inode_readahead_blks;
1202 unsigned int s_inode_goal;
1203 spinlock_t s_next_gen_lock;
1204 u32 s_next_generation;
1205 u32 s_hash_seed[4];
1206 int s_def_hash_version;
1207 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1208 struct percpu_counter s_freeclusters_counter;
1209 struct percpu_counter s_freeinodes_counter;
1210 struct percpu_counter s_dirs_counter;
1211 struct percpu_counter s_dirtyclusters_counter;
1212 struct blockgroup_lock *s_blockgroup_lock;
1213 struct proc_dir_entry *s_proc;
1214 struct kobject s_kobj;
1215 struct completion s_kobj_unregister;
1216 struct super_block *s_sb;
1217
1218 /* Journaling */
1219 struct journal_s *s_journal;
1220 struct list_head s_orphan;
1221 struct mutex s_orphan_lock;
1222 unsigned long s_resize_flags; /* Flags indicating if there
1223 is a resizer */
1224 unsigned long s_commit_interval;
1225 u32 s_max_batch_time;
1226 u32 s_min_batch_time;
1227 struct block_device *journal_bdev;
1228 #ifdef CONFIG_QUOTA
1229 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1230 int s_jquota_fmt; /* Format of quota to use */
1231 #endif
1232 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1233 struct rb_root system_blks;
1234
1235 #ifdef EXTENTS_STATS
1236 /* ext4 extents stats */
1237 unsigned long s_ext_min;
1238 unsigned long s_ext_max;
1239 unsigned long s_depth_max;
1240 spinlock_t s_ext_stats_lock;
1241 unsigned long s_ext_blocks;
1242 unsigned long s_ext_extents;
1243 #endif
1244
1245 /* for buddy allocator */
1246 struct ext4_group_info ***s_group_info;
1247 struct inode *s_buddy_cache;
1248 spinlock_t s_md_lock;
1249 unsigned short *s_mb_offsets;
1250 unsigned int *s_mb_maxs;
1251 unsigned int s_group_info_size;
1252
1253 /* tunables */
1254 unsigned long s_stripe;
1255 unsigned int s_mb_stream_request;
1256 unsigned int s_mb_max_to_scan;
1257 unsigned int s_mb_min_to_scan;
1258 unsigned int s_mb_stats;
1259 unsigned int s_mb_order2_reqs;
1260 unsigned int s_mb_group_prealloc;
1261 unsigned int s_max_writeback_mb_bump;
1262 unsigned int s_max_dir_size_kb;
1263 /* where last allocation was done - for stream allocation */
1264 unsigned long s_mb_last_group;
1265 unsigned long s_mb_last_start;
1266
1267 /* stats for buddy allocator */
1268 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1269 atomic_t s_bal_success; /* we found long enough chunks */
1270 atomic_t s_bal_allocated; /* in blocks */
1271 atomic_t s_bal_ex_scanned; /* total extents scanned */
1272 atomic_t s_bal_goals; /* goal hits */
1273 atomic_t s_bal_breaks; /* too long searches */
1274 atomic_t s_bal_2orders; /* 2^order hits */
1275 spinlock_t s_bal_lock;
1276 unsigned long s_mb_buddies_generated;
1277 unsigned long long s_mb_generation_time;
1278 atomic_t s_mb_lost_chunks;
1279 atomic_t s_mb_preallocated;
1280 atomic_t s_mb_discarded;
1281 atomic_t s_lock_busy;
1282
1283 /* locality groups */
1284 struct ext4_locality_group __percpu *s_locality_groups;
1285
1286 /* for write statistics */
1287 unsigned long s_sectors_written_start;
1288 u64 s_kbytes_written;
1289
1290 /* the size of zero-out chunk */
1291 unsigned int s_extent_max_zeroout_kb;
1292
1293 unsigned int s_log_groups_per_flex;
1294 struct flex_groups *s_flex_groups;
1295 ext4_group_t s_flex_groups_allocated;
1296
1297 /* workqueue for dio unwritten */
1298 struct workqueue_struct *dio_unwritten_wq;
1299
1300 /* timer for periodic error stats printing */
1301 struct timer_list s_err_report;
1302
1303 /* Lazy inode table initialization info */
1304 struct ext4_li_request *s_li_request;
1305 /* Wait multiplier for lazy initialization thread */
1306 unsigned int s_li_wait_mult;
1307
1308 /* Kernel thread for multiple mount protection */
1309 struct task_struct *s_mmp_tsk;
1310
1311 /* record the last minlen when FITRIM is called. */
1312 atomic_t s_last_trim_minblks;
1313
1314 /* Reference to checksum algorithm driver via cryptoapi */
1315 struct crypto_shash *s_chksum_driver;
1316
1317 /* Precomputed FS UUID checksum for seeding other checksums */
1318 __u32 s_csum_seed;
1319 };
1320
1321 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1322 {
1323 return sb->s_fs_info;
1324 }
1325 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1326 {
1327 return container_of(inode, struct ext4_inode_info, vfs_inode);
1328 }
1329
1330 static inline struct timespec ext4_current_time(struct inode *inode)
1331 {
1332 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1333 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1334 }
1335
1336 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1337 {
1338 return ino == EXT4_ROOT_INO ||
1339 ino == EXT4_USR_QUOTA_INO ||
1340 ino == EXT4_GRP_QUOTA_INO ||
1341 ino == EXT4_JOURNAL_INO ||
1342 ino == EXT4_RESIZE_INO ||
1343 (ino >= EXT4_FIRST_INO(sb) &&
1344 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1345 }
1346
1347 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1348 struct ext4_io_end *io_end)
1349 {
1350 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1351 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1352 atomic_inc(&EXT4_I(inode)->i_unwritten);
1353 }
1354 }
1355
1356 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1357 {
1358 return inode->i_private;
1359 }
1360
1361 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1362 {
1363 inode->i_private = io;
1364 }
1365
1366 /*
1367 * Inode dynamic state flags
1368 */
1369 enum {
1370 EXT4_STATE_JDATA, /* journaled data exists */
1371 EXT4_STATE_NEW, /* inode is newly created */
1372 EXT4_STATE_XATTR, /* has in-inode xattrs */
1373 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1374 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1375 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1376 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1377 EXT4_STATE_NEWENTRY, /* File just added to dir */
1378 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1379 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1380 nolocking */
1381 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1382 };
1383
1384 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1385 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1386 { \
1387 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1388 } \
1389 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1390 { \
1391 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1392 } \
1393 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1394 { \
1395 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1396 }
1397
1398 EXT4_INODE_BIT_FNS(flag, flags, 0)
1399 #if (BITS_PER_LONG < 64)
1400 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1401
1402 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1403 {
1404 (ei)->i_state_flags = 0;
1405 }
1406 #else
1407 EXT4_INODE_BIT_FNS(state, flags, 32)
1408
1409 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1410 {
1411 /* We depend on the fact that callers will set i_flags */
1412 }
1413 #endif
1414 #else
1415 /* Assume that user mode programs are passing in an ext4fs superblock, not
1416 * a kernel struct super_block. This will allow us to call the feature-test
1417 * macros from user land. */
1418 #define EXT4_SB(sb) (sb)
1419 #endif
1420
1421 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1422
1423 /*
1424 * Codes for operating systems
1425 */
1426 #define EXT4_OS_LINUX 0
1427 #define EXT4_OS_HURD 1
1428 #define EXT4_OS_MASIX 2
1429 #define EXT4_OS_FREEBSD 3
1430 #define EXT4_OS_LITES 4
1431
1432 /*
1433 * Revision levels
1434 */
1435 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1436 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1437
1438 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1439 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1440
1441 #define EXT4_GOOD_OLD_INODE_SIZE 128
1442
1443 /*
1444 * Feature set definitions
1445 */
1446
1447 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1448 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1449 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1450 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1451 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1452 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1453 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1454 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1455 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1456 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1457 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1458 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1459 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1460 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1461 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1462 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1463 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1464 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1465
1466 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1467 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1468 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1469 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1470 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1471 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1472
1473 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1474 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1475 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1476 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1477 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1478 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1479 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1480 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1481 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1482 /*
1483 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1484 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1485 * all other data structures' checksums. However, the METADATA_CSUM and
1486 * GDT_CSUM bits are mutually exclusive.
1487 */
1488 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1489
1490 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1491 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1492 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1493 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1494 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1495 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1496 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1497 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1498 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1499 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1500 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1501 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1502 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1503 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1504
1505 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1506 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1507 EXT4_FEATURE_INCOMPAT_META_BG)
1508 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1509 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1510 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1511
1512 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1513 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1514 EXT4_FEATURE_INCOMPAT_RECOVER| \
1515 EXT4_FEATURE_INCOMPAT_META_BG)
1516 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1517 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1518 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1519
1520 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1521 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1522 EXT4_FEATURE_INCOMPAT_RECOVER| \
1523 EXT4_FEATURE_INCOMPAT_META_BG| \
1524 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1525 EXT4_FEATURE_INCOMPAT_64BIT| \
1526 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1527 EXT4_FEATURE_INCOMPAT_MMP | \
1528 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1529 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1530 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1531 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1532 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1533 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1534 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1535 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1536 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1537 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1538 EXT4_FEATURE_RO_COMPAT_QUOTA)
1539
1540 /*
1541 * Default values for user and/or group using reserved blocks
1542 */
1543 #define EXT4_DEF_RESUID 0
1544 #define EXT4_DEF_RESGID 0
1545
1546 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1547
1548 /*
1549 * Default mount options
1550 */
1551 #define EXT4_DEFM_DEBUG 0x0001
1552 #define EXT4_DEFM_BSDGROUPS 0x0002
1553 #define EXT4_DEFM_XATTR_USER 0x0004
1554 #define EXT4_DEFM_ACL 0x0008
1555 #define EXT4_DEFM_UID16 0x0010
1556 #define EXT4_DEFM_JMODE 0x0060
1557 #define EXT4_DEFM_JMODE_DATA 0x0020
1558 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1559 #define EXT4_DEFM_JMODE_WBACK 0x0060
1560 #define EXT4_DEFM_NOBARRIER 0x0100
1561 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1562 #define EXT4_DEFM_DISCARD 0x0400
1563 #define EXT4_DEFM_NODELALLOC 0x0800
1564
1565 /*
1566 * Default journal batch times
1567 */
1568 #define EXT4_DEF_MIN_BATCH_TIME 0
1569 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1570
1571 /*
1572 * Minimum number of groups in a flexgroup before we separate out
1573 * directories into the first block group of a flexgroup
1574 */
1575 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1576
1577 /*
1578 * Structure of a directory entry
1579 */
1580 #define EXT4_NAME_LEN 255
1581
1582 struct ext4_dir_entry {
1583 __le32 inode; /* Inode number */
1584 __le16 rec_len; /* Directory entry length */
1585 __le16 name_len; /* Name length */
1586 char name[EXT4_NAME_LEN]; /* File name */
1587 };
1588
1589 /*
1590 * The new version of the directory entry. Since EXT4 structures are
1591 * stored in intel byte order, and the name_len field could never be
1592 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1593 * file_type field.
1594 */
1595 struct ext4_dir_entry_2 {
1596 __le32 inode; /* Inode number */
1597 __le16 rec_len; /* Directory entry length */
1598 __u8 name_len; /* Name length */
1599 __u8 file_type;
1600 char name[EXT4_NAME_LEN]; /* File name */
1601 };
1602
1603 /*
1604 * This is a bogus directory entry at the end of each leaf block that
1605 * records checksums.
1606 */
1607 struct ext4_dir_entry_tail {
1608 __le32 det_reserved_zero1; /* Pretend to be unused */
1609 __le16 det_rec_len; /* 12 */
1610 __u8 det_reserved_zero2; /* Zero name length */
1611 __u8 det_reserved_ft; /* 0xDE, fake file type */
1612 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1613 };
1614
1615 #define EXT4_DIRENT_TAIL(block, blocksize) \
1616 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1617 ((blocksize) - \
1618 sizeof(struct ext4_dir_entry_tail))))
1619
1620 /*
1621 * Ext4 directory file types. Only the low 3 bits are used. The
1622 * other bits are reserved for now.
1623 */
1624 #define EXT4_FT_UNKNOWN 0
1625 #define EXT4_FT_REG_FILE 1
1626 #define EXT4_FT_DIR 2
1627 #define EXT4_FT_CHRDEV 3
1628 #define EXT4_FT_BLKDEV 4
1629 #define EXT4_FT_FIFO 5
1630 #define EXT4_FT_SOCK 6
1631 #define EXT4_FT_SYMLINK 7
1632
1633 #define EXT4_FT_MAX 8
1634
1635 #define EXT4_FT_DIR_CSUM 0xDE
1636
1637 /*
1638 * EXT4_DIR_PAD defines the directory entries boundaries
1639 *
1640 * NOTE: It must be a multiple of 4
1641 */
1642 #define EXT4_DIR_PAD 4
1643 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1644 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1645 ~EXT4_DIR_ROUND)
1646 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1647
1648 /*
1649 * If we ever get support for fs block sizes > page_size, we'll need
1650 * to remove the #if statements in the next two functions...
1651 */
1652 static inline unsigned int
1653 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1654 {
1655 unsigned len = le16_to_cpu(dlen);
1656
1657 #if (PAGE_CACHE_SIZE >= 65536)
1658 if (len == EXT4_MAX_REC_LEN || len == 0)
1659 return blocksize;
1660 return (len & 65532) | ((len & 3) << 16);
1661 #else
1662 return len;
1663 #endif
1664 }
1665
1666 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1667 {
1668 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1669 BUG();
1670 #if (PAGE_CACHE_SIZE >= 65536)
1671 if (len < 65536)
1672 return cpu_to_le16(len);
1673 if (len == blocksize) {
1674 if (blocksize == 65536)
1675 return cpu_to_le16(EXT4_MAX_REC_LEN);
1676 else
1677 return cpu_to_le16(0);
1678 }
1679 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1680 #else
1681 return cpu_to_le16(len);
1682 #endif
1683 }
1684
1685 /*
1686 * Hash Tree Directory indexing
1687 * (c) Daniel Phillips, 2001
1688 */
1689
1690 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1691 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1692 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1693 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1694 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1695
1696 /* Legal values for the dx_root hash_version field: */
1697
1698 #define DX_HASH_LEGACY 0
1699 #define DX_HASH_HALF_MD4 1
1700 #define DX_HASH_TEA 2
1701 #define DX_HASH_LEGACY_UNSIGNED 3
1702 #define DX_HASH_HALF_MD4_UNSIGNED 4
1703 #define DX_HASH_TEA_UNSIGNED 5
1704
1705 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1706 const void *address, unsigned int length)
1707 {
1708 struct {
1709 struct shash_desc shash;
1710 char ctx[4];
1711 } desc;
1712 int err;
1713
1714 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1715
1716 desc.shash.tfm = sbi->s_chksum_driver;
1717 desc.shash.flags = 0;
1718 *(u32 *)desc.ctx = crc;
1719
1720 err = crypto_shash_update(&desc.shash, address, length);
1721 BUG_ON(err);
1722
1723 return *(u32 *)desc.ctx;
1724 }
1725
1726 #ifdef __KERNEL__
1727
1728 /* hash info structure used by the directory hash */
1729 struct dx_hash_info
1730 {
1731 u32 hash;
1732 u32 minor_hash;
1733 int hash_version;
1734 u32 *seed;
1735 };
1736
1737
1738 /* 32 and 64 bit signed EOF for dx directories */
1739 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1740 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1741
1742
1743 /*
1744 * Control parameters used by ext4_htree_next_block
1745 */
1746 #define HASH_NB_ALWAYS 1
1747
1748
1749 /*
1750 * Describe an inode's exact location on disk and in memory
1751 */
1752 struct ext4_iloc
1753 {
1754 struct buffer_head *bh;
1755 unsigned long offset;
1756 ext4_group_t block_group;
1757 };
1758
1759 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1760 {
1761 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1762 }
1763
1764 /*
1765 * This structure is stuffed into the struct file's private_data field
1766 * for directories. It is where we put information so that we can do
1767 * readdir operations in hash tree order.
1768 */
1769 struct dir_private_info {
1770 struct rb_root root;
1771 struct rb_node *curr_node;
1772 struct fname *extra_fname;
1773 loff_t last_pos;
1774 __u32 curr_hash;
1775 __u32 curr_minor_hash;
1776 __u32 next_hash;
1777 };
1778
1779 /* calculate the first block number of the group */
1780 static inline ext4_fsblk_t
1781 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1782 {
1783 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1784 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1785 }
1786
1787 /*
1788 * Special error return code only used by dx_probe() and its callers.
1789 */
1790 #define ERR_BAD_DX_DIR -75000
1791
1792 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1793 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1794
1795 /*
1796 * Timeout and state flag for lazy initialization inode thread.
1797 */
1798 #define EXT4_DEF_LI_WAIT_MULT 10
1799 #define EXT4_DEF_LI_MAX_START_DELAY 5
1800 #define EXT4_LAZYINIT_QUIT 0x0001
1801 #define EXT4_LAZYINIT_RUNNING 0x0002
1802
1803 /*
1804 * Lazy inode table initialization info
1805 */
1806 struct ext4_lazy_init {
1807 unsigned long li_state;
1808 struct list_head li_request_list;
1809 struct mutex li_list_mtx;
1810 };
1811
1812 struct ext4_li_request {
1813 struct super_block *lr_super;
1814 struct ext4_sb_info *lr_sbi;
1815 ext4_group_t lr_next_group;
1816 struct list_head lr_request;
1817 unsigned long lr_next_sched;
1818 unsigned long lr_timeout;
1819 };
1820
1821 struct ext4_features {
1822 struct kobject f_kobj;
1823 struct completion f_kobj_unregister;
1824 };
1825
1826 /*
1827 * This structure will be used for multiple mount protection. It will be
1828 * written into the block number saved in the s_mmp_block field in the
1829 * superblock. Programs that check MMP should assume that if
1830 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1831 * to use the filesystem, regardless of how old the timestamp is.
1832 */
1833 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1834 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1835 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1836 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1837
1838 struct mmp_struct {
1839 __le32 mmp_magic; /* Magic number for MMP */
1840 __le32 mmp_seq; /* Sequence no. updated periodically */
1841
1842 /*
1843 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1844 * purposes and do not affect the correctness of the algorithm
1845 */
1846 __le64 mmp_time; /* Time last updated */
1847 char mmp_nodename[64]; /* Node which last updated MMP block */
1848 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1849
1850 /*
1851 * mmp_check_interval is used to verify if the MMP block has been
1852 * updated on the block device. The value is updated based on the
1853 * maximum time to write the MMP block during an update cycle.
1854 */
1855 __le16 mmp_check_interval;
1856
1857 __le16 mmp_pad1;
1858 __le32 mmp_pad2[226];
1859 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1860 };
1861
1862 /* arguments passed to the mmp thread */
1863 struct mmpd_data {
1864 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1865 struct super_block *sb; /* super block of the fs */
1866 };
1867
1868 /*
1869 * Check interval multiplier
1870 * The MMP block is written every update interval and initially checked every
1871 * update interval x the multiplier (the value is then adapted based on the
1872 * write latency). The reason is that writes can be delayed under load and we
1873 * don't want readers to incorrectly assume that the filesystem is no longer
1874 * in use.
1875 */
1876 #define EXT4_MMP_CHECK_MULT 2UL
1877
1878 /*
1879 * Minimum interval for MMP checking in seconds.
1880 */
1881 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1882
1883 /*
1884 * Maximum interval for MMP checking in seconds.
1885 */
1886 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1887
1888 /*
1889 * Function prototypes
1890 */
1891
1892 /*
1893 * Ok, these declarations are also in <linux/kernel.h> but none of the
1894 * ext4 source programs needs to include it so they are duplicated here.
1895 */
1896 # define NORET_TYPE /**/
1897 # define ATTRIB_NORET __attribute__((noreturn))
1898 # define NORET_AND noreturn,
1899
1900 /* bitmap.c */
1901 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1902 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1903 struct ext4_group_desc *gdp,
1904 struct buffer_head *bh, int sz);
1905 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1906 struct ext4_group_desc *gdp,
1907 struct buffer_head *bh, int sz);
1908 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1909 struct ext4_group_desc *gdp,
1910 struct buffer_head *bh);
1911 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1912 struct ext4_group_desc *gdp,
1913 struct buffer_head *bh);
1914
1915 /* balloc.c */
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);
2013 extern void ext4_free_inode(handle_t *, struct inode *);
2014 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2015 extern unsigned long ext4_count_free_inodes(struct super_block *);
2016 extern unsigned long ext4_count_dirs(struct super_block *);
2017 extern void ext4_check_inodes_bitmap(struct super_block *);
2018 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2019 extern int ext4_init_inode_table(struct super_block *sb,
2020 ext4_group_t group, int barrier);
2021 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2022
2023 /* mballoc.c */
2024 extern long ext4_mb_stats;
2025 extern long ext4_mb_max_to_scan;
2026 extern int ext4_mb_init(struct super_block *);
2027 extern int ext4_mb_release(struct super_block *);
2028 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2029 struct ext4_allocation_request *, int *);
2030 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2031 extern void ext4_discard_preallocations(struct inode *);
2032 extern int __init ext4_init_mballoc(void);
2033 extern void ext4_exit_mballoc(void);
2034 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2035 struct buffer_head *bh, ext4_fsblk_t block,
2036 unsigned long count, int flags);
2037 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2038 ext4_group_t ngroups);
2039 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2040 ext4_group_t i, struct ext4_group_desc *desc);
2041 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2042 ext4_fsblk_t block, unsigned long count);
2043 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2044
2045 /* inode.c */
2046 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2047 ext4_lblk_t, int, int *);
2048 struct buffer_head *ext4_bread(handle_t *, struct inode *,
2049 ext4_lblk_t, int, int *);
2050 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2051 struct buffer_head *bh_result, int create);
2052 int ext4_get_block(struct inode *inode, sector_t iblock,
2053 struct buffer_head *bh_result, int create);
2054 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2055 struct buffer_head *bh, int create);
2056 int ext4_walk_page_buffers(handle_t *handle,
2057 struct buffer_head *head,
2058 unsigned from,
2059 unsigned to,
2060 int *partial,
2061 int (*fn)(handle_t *handle,
2062 struct buffer_head *bh));
2063 int do_journal_get_write_access(handle_t *handle,
2064 struct buffer_head *bh);
2065 #define FALL_BACK_TO_NONDELALLOC 1
2066 #define CONVERT_INLINE_DATA 2
2067
2068 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2069 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2070 extern int ext4_setattr(struct dentry *, struct iattr *);
2071 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2072 struct kstat *stat);
2073 extern void ext4_evict_inode(struct inode *);
2074 extern void ext4_clear_inode(struct inode *);
2075 extern int ext4_sync_inode(handle_t *, struct inode *);
2076 extern void ext4_dirty_inode(struct inode *, int);
2077 extern int ext4_change_inode_journal_flag(struct inode *, int);
2078 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2079 extern int ext4_can_truncate(struct inode *inode);
2080 extern void ext4_truncate(struct inode *);
2081 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2082 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2083 extern void ext4_set_inode_flags(struct inode *);
2084 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2085 extern int ext4_alloc_da_blocks(struct inode *inode);
2086 extern void ext4_set_aops(struct inode *inode);
2087 extern int ext4_writepage_trans_blocks(struct inode *);
2088 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2089 extern int ext4_discard_partial_page_buffers(handle_t *handle,
2090 struct address_space *mapping, loff_t from,
2091 loff_t length, int flags);
2092 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2093 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2094 extern void ext4_da_update_reserve_space(struct inode *inode,
2095 int used, int quota_claim);
2096
2097 /* indirect.c */
2098 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2099 struct ext4_map_blocks *map, int flags);
2100 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2101 const struct iovec *iov, loff_t offset,
2102 unsigned long nr_segs);
2103 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2104 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
2105 extern void ext4_ind_truncate(struct inode *inode);
2106
2107 /* ioctl.c */
2108 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2109 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2110
2111 /* migrate.c */
2112 extern int ext4_ext_migrate(struct inode *);
2113
2114 /* namei.c */
2115 extern int ext4_dirent_csum_verify(struct inode *inode,
2116 struct ext4_dir_entry *dirent);
2117 extern int ext4_orphan_add(handle_t *, struct inode *);
2118 extern int ext4_orphan_del(handle_t *, struct inode *);
2119 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2120 __u32 start_minor_hash, __u32 *next_hash);
2121 extern int search_dir(struct buffer_head *bh,
2122 char *search_buf,
2123 int buf_size,
2124 struct inode *dir,
2125 const struct qstr *d_name,
2126 unsigned int offset,
2127 struct ext4_dir_entry_2 **res_dir);
2128 extern int ext4_generic_delete_entry(handle_t *handle,
2129 struct inode *dir,
2130 struct ext4_dir_entry_2 *de_del,
2131 struct buffer_head *bh,
2132 void *entry_buf,
2133 int buf_size,
2134 int csum_size);
2135
2136 /* resize.c */
2137 extern int ext4_group_add(struct super_block *sb,
2138 struct ext4_new_group_data *input);
2139 extern int ext4_group_extend(struct super_block *sb,
2140 struct ext4_super_block *es,
2141 ext4_fsblk_t n_blocks_count);
2142 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2143
2144 /* super.c */
2145 extern int ext4_calculate_overhead(struct super_block *sb);
2146 extern int ext4_superblock_csum_verify(struct super_block *sb,
2147 struct ext4_super_block *es);
2148 extern void ext4_superblock_csum_set(struct super_block *sb);
2149 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2150 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2151 extern void ext4_kvfree(void *ptr);
2152 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2153 ext4_group_t ngroup);
2154 extern __printf(4, 5)
2155 void __ext4_error(struct super_block *, const char *, unsigned int,
2156 const char *, ...);
2157 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2158 __LINE__, ## message)
2159 extern __printf(5, 6)
2160 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2161 const char *, ...);
2162 extern __printf(5, 6)
2163 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2164 const char *, ...);
2165 extern void __ext4_std_error(struct super_block *, const char *,
2166 unsigned int, int);
2167 extern __printf(4, 5)
2168 void __ext4_abort(struct super_block *, const char *, unsigned int,
2169 const char *, ...);
2170 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2171 __LINE__, ## message)
2172 extern __printf(4, 5)
2173 void __ext4_warning(struct super_block *, const char *, unsigned int,
2174 const char *, ...);
2175 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2176 __LINE__, ## message)
2177 extern __printf(3, 4)
2178 void ext4_msg(struct super_block *, const char *, const char *, ...);
2179 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2180 const char *, unsigned int, const char *);
2181 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2182 __LINE__, msg)
2183 extern __printf(7, 8)
2184 void __ext4_grp_locked_error(const char *, unsigned int,
2185 struct super_block *, ext4_group_t,
2186 unsigned long, ext4_fsblk_t,
2187 const char *, ...);
2188 #define ext4_grp_locked_error(sb, grp, message...) \
2189 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2190 extern void ext4_update_dynamic_rev(struct super_block *sb);
2191 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2192 __u32 compat);
2193 extern int ext4_update_rocompat_feature(handle_t *handle,
2194 struct super_block *sb, __u32 rocompat);
2195 extern int ext4_update_incompat_feature(handle_t *handle,
2196 struct super_block *sb, __u32 incompat);
2197 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2198 struct ext4_group_desc *bg);
2199 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2200 struct ext4_group_desc *bg);
2201 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2202 struct ext4_group_desc *bg);
2203 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2204 struct ext4_group_desc *bg);
2205 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2206 struct ext4_group_desc *bg);
2207 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2208 struct ext4_group_desc *bg);
2209 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2210 struct ext4_group_desc *bg);
2211 extern void ext4_block_bitmap_set(struct super_block *sb,
2212 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2213 extern void ext4_inode_bitmap_set(struct super_block *sb,
2214 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2215 extern void ext4_inode_table_set(struct super_block *sb,
2216 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2217 extern void ext4_free_group_clusters_set(struct super_block *sb,
2218 struct ext4_group_desc *bg,
2219 __u32 count);
2220 extern void ext4_free_inodes_set(struct super_block *sb,
2221 struct ext4_group_desc *bg, __u32 count);
2222 extern void ext4_used_dirs_set(struct super_block *sb,
2223 struct ext4_group_desc *bg, __u32 count);
2224 extern void ext4_itable_unused_set(struct super_block *sb,
2225 struct ext4_group_desc *bg, __u32 count);
2226 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2227 struct ext4_group_desc *gdp);
2228 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2229 struct ext4_group_desc *gdp);
2230 extern int ext4_register_li_request(struct super_block *sb,
2231 ext4_group_t first_not_zeroed);
2232
2233 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2234 {
2235 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2236 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2237 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2238 }
2239
2240 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2241 {
2242 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2243 le32_to_cpu(es->s_blocks_count_lo);
2244 }
2245
2246 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2247 {
2248 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2249 le32_to_cpu(es->s_r_blocks_count_lo);
2250 }
2251
2252 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2253 {
2254 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2255 le32_to_cpu(es->s_free_blocks_count_lo);
2256 }
2257
2258 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2259 ext4_fsblk_t blk)
2260 {
2261 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2262 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2263 }
2264
2265 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2266 ext4_fsblk_t blk)
2267 {
2268 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2269 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2270 }
2271
2272 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2273 ext4_fsblk_t blk)
2274 {
2275 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2276 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2277 }
2278
2279 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2280 {
2281 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2282 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2283 le32_to_cpu(raw_inode->i_size_lo);
2284 else
2285 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2286 }
2287
2288 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2289 {
2290 raw_inode->i_size_lo = cpu_to_le32(i_size);
2291 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2292 }
2293
2294 static inline
2295 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2296 ext4_group_t group)
2297 {
2298 struct ext4_group_info ***grp_info;
2299 long indexv, indexh;
2300 grp_info = EXT4_SB(sb)->s_group_info;
2301 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2302 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2303 return grp_info[indexv][indexh];
2304 }
2305
2306 /*
2307 * Reading s_groups_count requires using smp_rmb() afterwards. See
2308 * the locking protocol documented in the comments of ext4_group_add()
2309 * in resize.c
2310 */
2311 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2312 {
2313 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2314
2315 smp_rmb();
2316 return ngroups;
2317 }
2318
2319 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2320 ext4_group_t block_group)
2321 {
2322 return block_group >> sbi->s_log_groups_per_flex;
2323 }
2324
2325 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2326 {
2327 return 1 << sbi->s_log_groups_per_flex;
2328 }
2329
2330 #define ext4_std_error(sb, errno) \
2331 do { \
2332 if ((errno)) \
2333 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2334 } while (0)
2335
2336 #ifdef CONFIG_SMP
2337 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2338 * counters. So we need to make sure we have free clusters more
2339 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2340 */
2341 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2342 #else
2343 #define EXT4_FREECLUSTERS_WATERMARK 0
2344 #endif
2345
2346 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2347 {
2348 /*
2349 * XXX: replace with spinlock if seen contended -bzzz
2350 */
2351 down_write(&EXT4_I(inode)->i_data_sem);
2352 if (newsize > EXT4_I(inode)->i_disksize)
2353 EXT4_I(inode)->i_disksize = newsize;
2354 up_write(&EXT4_I(inode)->i_data_sem);
2355 return ;
2356 }
2357
2358 struct ext4_group_info {
2359 unsigned long bb_state;
2360 struct rb_root bb_free_root;
2361 ext4_grpblk_t bb_first_free; /* first free block */
2362 ext4_grpblk_t bb_free; /* total free blocks */
2363 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2364 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2365 struct list_head bb_prealloc_list;
2366 #ifdef DOUBLE_CHECK
2367 void *bb_bitmap;
2368 #endif
2369 struct rw_semaphore alloc_sem;
2370 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2371 * regions, index is order.
2372 * bb_counters[3] = 5 means
2373 * 5 free 8-block regions. */
2374 };
2375
2376 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2377 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2378
2379 #define EXT4_MB_GRP_NEED_INIT(grp) \
2380 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2381
2382 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2383 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2384 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2385 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2386 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2387 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2388
2389 #define EXT4_MAX_CONTENTION 8
2390 #define EXT4_CONTENTION_THRESHOLD 2
2391
2392 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2393 ext4_group_t group)
2394 {
2395 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2396 }
2397
2398 /*
2399 * Returns true if the filesystem is busy enough that attempts to
2400 * access the block group locks has run into contention.
2401 */
2402 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2403 {
2404 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2405 }
2406
2407 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2408 {
2409 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2410 if (spin_trylock(lock))
2411 /*
2412 * We're able to grab the lock right away, so drop the
2413 * lock contention counter.
2414 */
2415 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2416 else {
2417 /*
2418 * The lock is busy, so bump the contention counter,
2419 * and then wait on the spin lock.
2420 */
2421 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2422 EXT4_MAX_CONTENTION);
2423 spin_lock(lock);
2424 }
2425 }
2426
2427 static inline void ext4_unlock_group(struct super_block *sb,
2428 ext4_group_t group)
2429 {
2430 spin_unlock(ext4_group_lock_ptr(sb, group));
2431 }
2432
2433 /*
2434 * Block validity checking
2435 */
2436 #define ext4_check_indirect_blockref(inode, bh) \
2437 ext4_check_blockref(__func__, __LINE__, inode, \
2438 (__le32 *)(bh)->b_data, \
2439 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2440
2441 #define ext4_ind_check_inode(inode) \
2442 ext4_check_blockref(__func__, __LINE__, inode, \
2443 EXT4_I(inode)->i_data, \
2444 EXT4_NDIR_BLOCKS)
2445
2446 /*
2447 * Inodes and files operations
2448 */
2449
2450 /* dir.c */
2451 extern const struct file_operations ext4_dir_operations;
2452
2453 /* file.c */
2454 extern const struct inode_operations ext4_file_inode_operations;
2455 extern const struct file_operations ext4_file_operations;
2456 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2457 extern void ext4_unwritten_wait(struct inode *inode);
2458
2459 /* namei.c */
2460 extern const struct inode_operations ext4_dir_inode_operations;
2461 extern const struct inode_operations ext4_special_inode_operations;
2462 extern struct dentry *ext4_get_parent(struct dentry *child);
2463 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2464 struct ext4_dir_entry_2 *de,
2465 int blocksize, int csum_size,
2466 unsigned int parent_ino, int dotdot_real_len);
2467 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2468 unsigned int blocksize);
2469 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2470 struct inode *inode,
2471 struct buffer_head *bh);
2472
2473 /* symlink.c */
2474 extern const struct inode_operations ext4_symlink_inode_operations;
2475 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2476
2477 /* block_validity */
2478 extern void ext4_release_system_zone(struct super_block *sb);
2479 extern int ext4_setup_system_zone(struct super_block *sb);
2480 extern int __init ext4_init_system_zone(void);
2481 extern void ext4_exit_system_zone(void);
2482 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2483 ext4_fsblk_t start_blk,
2484 unsigned int count);
2485 extern int ext4_check_blockref(const char *, unsigned int,
2486 struct inode *, __le32 *, unsigned int);
2487
2488 /* extents.c */
2489 struct ext4_ext_path;
2490 struct ext4_extent;
2491
2492 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2493 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2494 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2495 int chunk);
2496 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2497 struct ext4_map_blocks *map, int flags);
2498 extern void ext4_ext_truncate(struct inode *);
2499 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2500 loff_t length);
2501 extern void ext4_ext_init(struct super_block *);
2502 extern void ext4_ext_release(struct super_block *);
2503 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2504 loff_t len);
2505 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2506 ssize_t len);
2507 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2508 struct ext4_map_blocks *map, int flags);
2509 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2510 ext4_lblk_t lblocks);
2511 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2512 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2513 int num,
2514 struct ext4_ext_path *path);
2515 extern int ext4_can_extents_be_merged(struct inode *inode,
2516 struct ext4_extent *ex1,
2517 struct ext4_extent *ex2);
2518 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2519 struct ext4_ext_path *,
2520 struct ext4_extent *, int);
2521 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2522 struct ext4_ext_path *);
2523 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2524 extern int ext4_ext_check_inode(struct inode *inode);
2525 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2526 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2527 __u64 start, __u64 len);
2528
2529
2530 /* move_extent.c */
2531 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2532 __u64 start_orig, __u64 start_donor,
2533 __u64 len, __u64 *moved_len);
2534
2535 /* page-io.c */
2536 extern int __init ext4_init_pageio(void);
2537 extern void ext4_add_complete_io(ext4_io_end_t *io_end);
2538 extern void ext4_exit_pageio(void);
2539 extern void ext4_ioend_wait(struct inode *);
2540 extern void ext4_free_io_end(ext4_io_end_t *io);
2541 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2542 extern void ext4_io_submit(struct ext4_io_submit *io);
2543 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2544 struct page *page,
2545 int len,
2546 struct writeback_control *wbc);
2547
2548 /* mmp.c */
2549 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2550 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2551 extern int ext4_mmp_csum_verify(struct super_block *sb,
2552 struct mmp_struct *mmp);
2553
2554 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2555 enum ext4_state_bits {
2556 BH_Uninit /* blocks are allocated but uninitialized on disk */
2557 = BH_JBDPrivateStart,
2558 BH_AllocFromCluster, /* allocated blocks were part of already
2559 * allocated cluster. Note that this flag will
2560 * never, ever appear in a buffer_head's state
2561 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2562 * this is used. */
2563 };
2564
2565 BUFFER_FNS(Uninit, uninit)
2566 TAS_BUFFER_FNS(Uninit, uninit)
2567
2568 /*
2569 * Add new method to test whether block and inode bitmaps are properly
2570 * initialized. With uninit_bg reading the block from disk is not enough
2571 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2572 */
2573 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2574
2575 static inline int bitmap_uptodate(struct buffer_head *bh)
2576 {
2577 return (buffer_uptodate(bh) &&
2578 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2579 }
2580 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2581 {
2582 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2583 }
2584
2585 /*
2586 * Disable DIO read nolock optimization, so new dioreaders will be forced
2587 * to grab i_mutex
2588 */
2589 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2590 {
2591 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2592 smp_mb();
2593 }
2594 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2595 {
2596 smp_mb();
2597 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2598 }
2599
2600 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2601
2602 /* For ioend & aio unwritten conversion wait queues */
2603 #define EXT4_WQ_HASH_SZ 37
2604 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2605 EXT4_WQ_HASH_SZ])
2606 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2607 EXT4_WQ_HASH_SZ])
2608 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2609 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2610
2611 #define EXT4_RESIZING 0
2612 extern int ext4_resize_begin(struct super_block *sb);
2613 extern void ext4_resize_end(struct super_block *sb);
2614
2615 #endif /* __KERNEL__ */
2616
2617 #endif /* _EXT4_H */
Linux kernel - Deliverables
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