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ext4: track all extent status in extent status tree
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / ext4.h
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <crypto/hash.h>
33 #ifdef __KERNEL__
34 #include <linux/compat.h>
35 #endif
36
37 /*
38 * The fourth extended filesystem constants/structures
39 */
40
41 /*
42 * Define EXT4FS_DEBUG to produce debug messages
43 */
44 #undef EXT4FS_DEBUG
45
46 /*
47 * Debug code
48 */
49 #ifdef EXT4FS_DEBUG
50 #define ext4_debug(f, a...) \
51 do { \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
55 } while (0)
56 #else
57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
58 #endif
59
60 /*
61 * Turn on EXT_DEBUG to get lots of info about extents operations.
62 */
63 #define EXT_DEBUG__
64 #ifdef EXT_DEBUG
65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
66 #else
67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
68 #endif
69
70 #define EXT4_ERROR_INODE(inode, fmt, a...) \
71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
72
73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
75
76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
78
79 /* data type for block offset of block group */
80 typedef int ext4_grpblk_t;
81
82 /* data type for filesystem-wide blocks number */
83 typedef unsigned long long ext4_fsblk_t;
84
85 /* data type for file logical block number */
86 typedef __u32 ext4_lblk_t;
87
88 /* data type for block group number */
89 typedef unsigned int ext4_group_t;
90
91 /*
92 * Flags used in mballoc's allocation_context flags field.
93 *
94 * Also used to show what's going on for debugging purposes when the
95 * flag field is exported via the traceport interface
96 */
97
98 /* prefer goal again. length */
99 #define EXT4_MB_HINT_MERGE 0x0001
100 /* blocks already reserved */
101 #define EXT4_MB_HINT_RESERVED 0x0002
102 /* metadata is being allocated */
103 #define EXT4_MB_HINT_METADATA 0x0004
104 /* first blocks in the file */
105 #define EXT4_MB_HINT_FIRST 0x0008
106 /* search for the best chunk */
107 #define EXT4_MB_HINT_BEST 0x0010
108 /* data is being allocated */
109 #define EXT4_MB_HINT_DATA 0x0020
110 /* don't preallocate (for tails) */
111 #define EXT4_MB_HINT_NOPREALLOC 0x0040
112 /* allocate for locality group */
113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
114 /* allocate goal blocks or none */
115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
116 /* goal is meaningful */
117 #define EXT4_MB_HINT_TRY_GOAL 0x0200
118 /* blocks already pre-reserved by delayed allocation */
119 #define EXT4_MB_DELALLOC_RESERVED 0x0400
120 /* We are doing stream allocation */
121 #define EXT4_MB_STREAM_ALLOC 0x0800
122 /* Use reserved root blocks if needed */
123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
124
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_DIRECT 0x0004
198
199 struct ext4_io_page {
200 struct page *p_page;
201 atomic_t p_count;
202 };
203
204 #define MAX_IO_PAGES 128
205
206 /*
207 * For converting uninitialized extents on a work queue.
208 *
209 * 'page' is only used from the writepage() path; 'pages' is only used for
210 * buffered writes; they are used to keep page references until conversion
211 * takes place. For AIO/DIO, neither field is filled in.
212 */
213 typedef struct ext4_io_end {
214 struct list_head list; /* per-file finished IO list */
215 struct inode *inode; /* file being written to */
216 unsigned int flag; /* unwritten or not */
217 loff_t offset; /* offset in the file */
218 ssize_t size; /* size of the extent */
219 struct kiocb *iocb; /* iocb struct for AIO */
220 int result; /* error value for AIO */
221 int num_io_pages; /* for writepages() */
222 struct ext4_io_page *pages[MAX_IO_PAGES]; /* for writepages() */
223 } ext4_io_end_t;
224
225 struct ext4_io_submit {
226 int io_op;
227 struct bio *io_bio;
228 ext4_io_end_t *io_end;
229 struct ext4_io_page *io_page;
230 sector_t io_next_block;
231 };
232
233 /*
234 * Special inodes numbers
235 */
236 #define EXT4_BAD_INO 1 /* Bad blocks inode */
237 #define EXT4_ROOT_INO 2 /* Root inode */
238 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
239 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
240 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
241 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
242 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
243 #define EXT4_JOURNAL_INO 8 /* Journal inode */
244
245 /* First non-reserved inode for old ext4 filesystems */
246 #define EXT4_GOOD_OLD_FIRST_INO 11
247
248 /*
249 * Maximal count of links to a file
250 */
251 #define EXT4_LINK_MAX 65000
252
253 /*
254 * Macro-instructions used to manage several block sizes
255 */
256 #define EXT4_MIN_BLOCK_SIZE 1024
257 #define EXT4_MAX_BLOCK_SIZE 65536
258 #define EXT4_MIN_BLOCK_LOG_SIZE 10
259 #define EXT4_MAX_BLOCK_LOG_SIZE 16
260 #ifdef __KERNEL__
261 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
262 #else
263 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
264 #endif
265 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
266 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
267 EXT4_SB(s)->s_cluster_bits)
268 #ifdef __KERNEL__
269 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
270 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
271 #else
272 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
273 #endif
274 #ifdef __KERNEL__
275 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
276 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
277 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
278 #else
279 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
280 EXT4_GOOD_OLD_INODE_SIZE : \
281 (s)->s_inode_size)
282 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
283 EXT4_GOOD_OLD_FIRST_INO : \
284 (s)->s_first_ino)
285 #endif
286 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
287
288 /* Translate a block number to a cluster number */
289 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
290 /* Translate a cluster number to a block number */
291 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
292 /* Translate # of blks to # of clusters */
293 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
294 (sbi)->s_cluster_bits)
295
296 /*
297 * Structure of a blocks group descriptor
298 */
299 struct ext4_group_desc
300 {
301 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
302 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
303 __le32 bg_inode_table_lo; /* Inodes table block */
304 __le16 bg_free_blocks_count_lo;/* Free blocks count */
305 __le16 bg_free_inodes_count_lo;/* Free inodes count */
306 __le16 bg_used_dirs_count_lo; /* Directories count */
307 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
308 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
309 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
310 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
311 __le16 bg_itable_unused_lo; /* Unused inodes count */
312 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
313 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
314 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
315 __le32 bg_inode_table_hi; /* Inodes table block MSB */
316 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
317 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
318 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
319 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
320 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
321 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
322 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
323 __u32 bg_reserved;
324 };
325
326 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
327 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
328 sizeof(__le16))
329 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
330 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
331 sizeof(__le16))
332
333 /*
334 * Structure of a flex block group info
335 */
336
337 struct flex_groups {
338 atomic_t free_inodes;
339 atomic_t free_clusters;
340 atomic_t used_dirs;
341 };
342
343 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
344 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
345 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
346
347 /*
348 * Macro-instructions used to manage group descriptors
349 */
350 #define EXT4_MIN_DESC_SIZE 32
351 #define EXT4_MIN_DESC_SIZE_64BIT 64
352 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
353 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
354 #ifdef __KERNEL__
355 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
356 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
357 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
358 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
359 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
360 #else
361 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
362 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
363 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
364 #endif
365
366 /*
367 * Constants relative to the data blocks
368 */
369 #define EXT4_NDIR_BLOCKS 12
370 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
371 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
372 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
373 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
374
375 /*
376 * Inode flags
377 */
378 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
379 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
380 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
381 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
382 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
383 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
384 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
385 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
386 /* Reserved for compression usage... */
387 #define EXT4_DIRTY_FL 0x00000100
388 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
389 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
390 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
391 /* End compression flags --- maybe not all used */
392 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
393 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
394 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
395 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
396 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
397 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
398 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
399 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
400 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
401 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
402 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
403 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
404
405 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
406 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
407
408 /* Flags that should be inherited by new inodes from their parent. */
409 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
410 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
411 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
412 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
413
414 /* Flags that are appropriate for regular files (all but dir-specific ones). */
415 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
416
417 /* Flags that are appropriate for non-directories/regular files. */
418 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
419
420 /* Mask out flags that are inappropriate for the given type of inode. */
421 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
422 {
423 if (S_ISDIR(mode))
424 return flags;
425 else if (S_ISREG(mode))
426 return flags & EXT4_REG_FLMASK;
427 else
428 return flags & EXT4_OTHER_FLMASK;
429 }
430
431 /*
432 * Inode flags used for atomic set/get
433 */
434 enum {
435 EXT4_INODE_SECRM = 0, /* Secure deletion */
436 EXT4_INODE_UNRM = 1, /* Undelete */
437 EXT4_INODE_COMPR = 2, /* Compress file */
438 EXT4_INODE_SYNC = 3, /* Synchronous updates */
439 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
440 EXT4_INODE_APPEND = 5, /* writes to file may only append */
441 EXT4_INODE_NODUMP = 6, /* do not dump file */
442 EXT4_INODE_NOATIME = 7, /* do not update atime */
443 /* Reserved for compression usage... */
444 EXT4_INODE_DIRTY = 8,
445 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
446 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
447 EXT4_INODE_ECOMPR = 11, /* Compression error */
448 /* End compression flags --- maybe not all used */
449 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
450 EXT4_INODE_IMAGIC = 13, /* AFS directory */
451 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
452 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
453 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
454 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
455 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
456 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
457 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
458 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
459 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
460 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
461 };
462
463 /*
464 * Since it's pretty easy to mix up bit numbers and hex values, we use a
465 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
466 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
467 * any extra space in the compiled kernel image, otherwise, the build will fail.
468 * It's important that these values are the same, since we are using
469 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
470 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
471 * values found in ext2, ext3 and ext4 filesystems, and of course the values
472 * defined in e2fsprogs.
473 *
474 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
475 */
476 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
477 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
478
479 static inline void ext4_check_flag_values(void)
480 {
481 CHECK_FLAG_VALUE(SECRM);
482 CHECK_FLAG_VALUE(UNRM);
483 CHECK_FLAG_VALUE(COMPR);
484 CHECK_FLAG_VALUE(SYNC);
485 CHECK_FLAG_VALUE(IMMUTABLE);
486 CHECK_FLAG_VALUE(APPEND);
487 CHECK_FLAG_VALUE(NODUMP);
488 CHECK_FLAG_VALUE(NOATIME);
489 CHECK_FLAG_VALUE(DIRTY);
490 CHECK_FLAG_VALUE(COMPRBLK);
491 CHECK_FLAG_VALUE(NOCOMPR);
492 CHECK_FLAG_VALUE(ECOMPR);
493 CHECK_FLAG_VALUE(INDEX);
494 CHECK_FLAG_VALUE(IMAGIC);
495 CHECK_FLAG_VALUE(JOURNAL_DATA);
496 CHECK_FLAG_VALUE(NOTAIL);
497 CHECK_FLAG_VALUE(DIRSYNC);
498 CHECK_FLAG_VALUE(TOPDIR);
499 CHECK_FLAG_VALUE(HUGE_FILE);
500 CHECK_FLAG_VALUE(EXTENTS);
501 CHECK_FLAG_VALUE(EA_INODE);
502 CHECK_FLAG_VALUE(EOFBLOCKS);
503 CHECK_FLAG_VALUE(INLINE_DATA);
504 CHECK_FLAG_VALUE(RESERVED);
505 }
506
507 /* Used to pass group descriptor data when online resize is done */
508 struct ext4_new_group_input {
509 __u32 group; /* Group number for this data */
510 __u64 block_bitmap; /* Absolute block number of block bitmap */
511 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
512 __u64 inode_table; /* Absolute block number of inode table start */
513 __u32 blocks_count; /* Total number of blocks in this group */
514 __u16 reserved_blocks; /* Number of reserved blocks in this group */
515 __u16 unused;
516 };
517
518 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
519 struct compat_ext4_new_group_input {
520 u32 group;
521 compat_u64 block_bitmap;
522 compat_u64 inode_bitmap;
523 compat_u64 inode_table;
524 u32 blocks_count;
525 u16 reserved_blocks;
526 u16 unused;
527 };
528 #endif
529
530 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
531 struct ext4_new_group_data {
532 __u32 group;
533 __u64 block_bitmap;
534 __u64 inode_bitmap;
535 __u64 inode_table;
536 __u32 blocks_count;
537 __u16 reserved_blocks;
538 __u16 unused;
539 __u32 free_blocks_count;
540 };
541
542 /* Indexes used to index group tables in ext4_new_group_data */
543 enum {
544 BLOCK_BITMAP = 0, /* block bitmap */
545 INODE_BITMAP, /* inode bitmap */
546 INODE_TABLE, /* inode tables */
547 GROUP_TABLE_COUNT,
548 };
549
550 /*
551 * Flags used by ext4_map_blocks()
552 */
553 /* Allocate any needed blocks and/or convert an unitialized
554 extent to be an initialized ext4 */
555 #define EXT4_GET_BLOCKS_CREATE 0x0001
556 /* Request the creation of an unitialized extent */
557 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
558 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
559 EXT4_GET_BLOCKS_CREATE)
560 /* Caller is from the delayed allocation writeout path,
561 so set the magic i_delalloc_reserve_flag after taking the
562 inode allocation semaphore for */
563 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
564 /* caller is from the direct IO path, request to creation of an
565 unitialized extents if not allocated, split the uninitialized
566 extent if blocks has been preallocated already*/
567 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
568 #define EXT4_GET_BLOCKS_CONVERT 0x0010
569 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
570 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
571 /* Convert extent to initialized after IO complete */
572 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
573 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
574 /* Punch out blocks of an extent */
575 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
576 /* Don't normalize allocation size (used for fallocate) */
577 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
578 /* Request will not result in inode size update (user for fallocate) */
579 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
580 /* Do not take i_data_sem locking in ext4_map_blocks */
581 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
582
583 /*
584 * Flags used by ext4_free_blocks
585 */
586 #define EXT4_FREE_BLOCKS_METADATA 0x0001
587 #define EXT4_FREE_BLOCKS_FORGET 0x0002
588 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
589 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
590 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
591 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
592
593 /*
594 * Flags used by ext4_discard_partial_page_buffers
595 */
596 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
597
598 /*
599 * ioctl commands
600 */
601 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
602 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
603 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
604 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
605 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
606 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
607 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
608 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
609 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
610 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
611 #define EXT4_IOC_MIGRATE _IO('f', 9)
612 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
613 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
614 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
615 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
616 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
617
618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
619 /*
620 * ioctl commands in 32 bit emulation
621 */
622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
632 #endif
633
634 /* Max physical block we can address w/o extents */
635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
636
637 /*
638 * Structure of an inode on the disk
639 */
640 struct ext4_inode {
641 __le16 i_mode; /* File mode */
642 __le16 i_uid; /* Low 16 bits of Owner Uid */
643 __le32 i_size_lo; /* Size in bytes */
644 __le32 i_atime; /* Access time */
645 __le32 i_ctime; /* Inode Change time */
646 __le32 i_mtime; /* Modification time */
647 __le32 i_dtime; /* Deletion Time */
648 __le16 i_gid; /* Low 16 bits of Group Id */
649 __le16 i_links_count; /* Links count */
650 __le32 i_blocks_lo; /* Blocks count */
651 __le32 i_flags; /* File flags */
652 union {
653 struct {
654 __le32 l_i_version;
655 } linux1;
656 struct {
657 __u32 h_i_translator;
658 } hurd1;
659 struct {
660 __u32 m_i_reserved1;
661 } masix1;
662 } osd1; /* OS dependent 1 */
663 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
664 __le32 i_generation; /* File version (for NFS) */
665 __le32 i_file_acl_lo; /* File ACL */
666 __le32 i_size_high;
667 __le32 i_obso_faddr; /* Obsoleted fragment address */
668 union {
669 struct {
670 __le16 l_i_blocks_high; /* were l_i_reserved1 */
671 __le16 l_i_file_acl_high;
672 __le16 l_i_uid_high; /* these 2 fields */
673 __le16 l_i_gid_high; /* were reserved2[0] */
674 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
675 __le16 l_i_reserved;
676 } linux2;
677 struct {
678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
679 __u16 h_i_mode_high;
680 __u16 h_i_uid_high;
681 __u16 h_i_gid_high;
682 __u32 h_i_author;
683 } hurd2;
684 struct {
685 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
686 __le16 m_i_file_acl_high;
687 __u32 m_i_reserved2[2];
688 } masix2;
689 } osd2; /* OS dependent 2 */
690 __le16 i_extra_isize;
691 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
692 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
693 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
694 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
695 __le32 i_crtime; /* File Creation time */
696 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
697 __le32 i_version_hi; /* high 32 bits for 64-bit version */
698 };
699
700 struct move_extent {
701 __u32 reserved; /* should be zero */
702 __u32 donor_fd; /* donor file descriptor */
703 __u64 orig_start; /* logical start offset in block for orig */
704 __u64 donor_start; /* logical start offset in block for donor */
705 __u64 len; /* block length to be moved */
706 __u64 moved_len; /* moved block length */
707 };
708
709 #define EXT4_EPOCH_BITS 2
710 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
711 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
712
713 /*
714 * Extended fields will fit into an inode if the filesystem was formatted
715 * with large inodes (-I 256 or larger) and there are not currently any EAs
716 * consuming all of the available space. For new inodes we always reserve
717 * enough space for the kernel's known extended fields, but for inodes
718 * created with an old kernel this might not have been the case. None of
719 * the extended inode fields is critical for correct filesystem operation.
720 * This macro checks if a certain field fits in the inode. Note that
721 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
722 */
723 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
724 ((offsetof(typeof(*ext4_inode), field) + \
725 sizeof((ext4_inode)->field)) \
726 <= (EXT4_GOOD_OLD_INODE_SIZE + \
727 (einode)->i_extra_isize)) \
728
729 static inline __le32 ext4_encode_extra_time(struct timespec *time)
730 {
731 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
732 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
733 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
734 }
735
736 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
737 {
738 if (sizeof(time->tv_sec) > 4)
739 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
740 << 32;
741 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
742 }
743
744 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
745 do { \
746 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
747 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
748 (raw_inode)->xtime ## _extra = \
749 ext4_encode_extra_time(&(inode)->xtime); \
750 } while (0)
751
752 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
753 do { \
754 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
755 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
756 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
757 (raw_inode)->xtime ## _extra = \
758 ext4_encode_extra_time(&(einode)->xtime); \
759 } while (0)
760
761 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
762 do { \
763 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
764 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
765 ext4_decode_extra_time(&(inode)->xtime, \
766 raw_inode->xtime ## _extra); \
767 else \
768 (inode)->xtime.tv_nsec = 0; \
769 } while (0)
770
771 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
772 do { \
773 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
774 (einode)->xtime.tv_sec = \
775 (signed)le32_to_cpu((raw_inode)->xtime); \
776 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
777 ext4_decode_extra_time(&(einode)->xtime, \
778 raw_inode->xtime ## _extra); \
779 else \
780 (einode)->xtime.tv_nsec = 0; \
781 } while (0)
782
783 #define i_disk_version osd1.linux1.l_i_version
784
785 #if defined(__KERNEL__) || defined(__linux__)
786 #define i_reserved1 osd1.linux1.l_i_reserved1
787 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
788 #define i_blocks_high osd2.linux2.l_i_blocks_high
789 #define i_uid_low i_uid
790 #define i_gid_low i_gid
791 #define i_uid_high osd2.linux2.l_i_uid_high
792 #define i_gid_high osd2.linux2.l_i_gid_high
793 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
794
795 #elif defined(__GNU__)
796
797 #define i_translator osd1.hurd1.h_i_translator
798 #define i_uid_high osd2.hurd2.h_i_uid_high
799 #define i_gid_high osd2.hurd2.h_i_gid_high
800 #define i_author osd2.hurd2.h_i_author
801
802 #elif defined(__masix__)
803
804 #define i_reserved1 osd1.masix1.m_i_reserved1
805 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
806 #define i_reserved2 osd2.masix2.m_i_reserved2
807
808 #endif /* defined(__KERNEL__) || defined(__linux__) */
809
810 /*
811 * storage for cached extent
812 * If ec_len == 0, then the cache is invalid.
813 * If ec_start == 0, then the cache represents a gap (null mapping)
814 */
815 struct ext4_ext_cache {
816 ext4_fsblk_t ec_start;
817 ext4_lblk_t ec_block;
818 __u32 ec_len; /* must be 32bit to return holes */
819 };
820
821 #include "extents_status.h"
822
823 /*
824 * fourth extended file system inode data in memory
825 */
826 struct ext4_inode_info {
827 __le32 i_data[15]; /* unconverted */
828 __u32 i_dtime;
829 ext4_fsblk_t i_file_acl;
830
831 /*
832 * i_block_group is the number of the block group which contains
833 * this file's inode. Constant across the lifetime of the inode,
834 * it is ued for making block allocation decisions - we try to
835 * place a file's data blocks near its inode block, and new inodes
836 * near to their parent directory's inode.
837 */
838 ext4_group_t i_block_group;
839 ext4_lblk_t i_dir_start_lookup;
840 #if (BITS_PER_LONG < 64)
841 unsigned long i_state_flags; /* Dynamic state flags */
842 #endif
843 unsigned long i_flags;
844
845 /*
846 * Extended attributes can be read independently of the main file
847 * data. Taking i_mutex even when reading would cause contention
848 * between readers of EAs and writers of regular file data, so
849 * instead we synchronize on xattr_sem when reading or changing
850 * EAs.
851 */
852 struct rw_semaphore xattr_sem;
853
854 struct list_head i_orphan; /* unlinked but open inodes */
855
856 /*
857 * i_disksize keeps track of what the inode size is ON DISK, not
858 * in memory. During truncate, i_size is set to the new size by
859 * the VFS prior to calling ext4_truncate(), but the filesystem won't
860 * set i_disksize to 0 until the truncate is actually under way.
861 *
862 * The intent is that i_disksize always represents the blocks which
863 * are used by this file. This allows recovery to restart truncate
864 * on orphans if we crash during truncate. We actually write i_disksize
865 * into the on-disk inode when writing inodes out, instead of i_size.
866 *
867 * The only time when i_disksize and i_size may be different is when
868 * a truncate is in progress. The only things which change i_disksize
869 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
870 */
871 loff_t i_disksize;
872
873 /*
874 * i_data_sem is for serialising ext4_truncate() against
875 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
876 * data tree are chopped off during truncate. We can't do that in
877 * ext4 because whenever we perform intermediate commits during
878 * truncate, the inode and all the metadata blocks *must* be in a
879 * consistent state which allows truncation of the orphans to restart
880 * during recovery. Hence we must fix the get_block-vs-truncate race
881 * by other means, so we have i_data_sem.
882 */
883 struct rw_semaphore i_data_sem;
884 struct inode vfs_inode;
885 struct jbd2_inode *jinode;
886
887 struct ext4_ext_cache i_cached_extent;
888 /*
889 * File creation time. Its function is same as that of
890 * struct timespec i_{a,c,m}time in the generic inode.
891 */
892 struct timespec i_crtime;
893
894 /* mballoc */
895 struct list_head i_prealloc_list;
896 spinlock_t i_prealloc_lock;
897
898 /* extents status tree */
899 struct ext4_es_tree i_es_tree;
900 rwlock_t i_es_lock;
901
902 /* ialloc */
903 ext4_group_t i_last_alloc_group;
904
905 /* allocation reservation info for delalloc */
906 /* In case of bigalloc, these refer to clusters rather than blocks */
907 unsigned int i_reserved_data_blocks;
908 unsigned int i_reserved_meta_blocks;
909 unsigned int i_allocated_meta_blocks;
910 ext4_lblk_t i_da_metadata_calc_last_lblock;
911 int i_da_metadata_calc_len;
912
913 /* on-disk additional length */
914 __u16 i_extra_isize;
915
916 /* Indicate the inline data space. */
917 u16 i_inline_off;
918 u16 i_inline_size;
919
920 #ifdef CONFIG_QUOTA
921 /* quota space reservation, managed internally by quota code */
922 qsize_t i_reserved_quota;
923 #endif
924
925 /* completed IOs that might need unwritten extents handling */
926 struct list_head i_completed_io_list;
927 spinlock_t i_completed_io_lock;
928 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
929 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
930 struct work_struct i_unwritten_work; /* deferred extent conversion */
931
932 spinlock_t i_block_reservation_lock;
933
934 /*
935 * Transactions that contain inode's metadata needed to complete
936 * fsync and fdatasync, respectively.
937 */
938 tid_t i_sync_tid;
939 tid_t i_datasync_tid;
940
941 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
942 __u32 i_csum_seed;
943 };
944
945 /*
946 * File system states
947 */
948 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
949 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
950 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
951
952 /*
953 * Misc. filesystem flags
954 */
955 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
956 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
957 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
958
959 /*
960 * Mount flags
961 */
962 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
963 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
964 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
965 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
966 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
967 #define EXT4_MOUNT_ERRORS_MASK 0x00070
968 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
969 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
970 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
971 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
972 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
973 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
974 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
975 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
976 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
977 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
978 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
979 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
980 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
981 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
982 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
983 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
984 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
985 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
986 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
987 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
988 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
989 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
990 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
991
992 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
993 specified delalloc */
994
995 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
996 ~EXT4_MOUNT_##opt
997 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
998 EXT4_MOUNT_##opt
999 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1000 EXT4_MOUNT_##opt)
1001
1002 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1003 ~EXT4_MOUNT2_##opt
1004 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1005 EXT4_MOUNT2_##opt
1006 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1007 EXT4_MOUNT2_##opt)
1008
1009 #define ext4_test_and_set_bit __test_and_set_bit_le
1010 #define ext4_set_bit __set_bit_le
1011 #define ext4_set_bit_atomic ext2_set_bit_atomic
1012 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1013 #define ext4_clear_bit __clear_bit_le
1014 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1015 #define ext4_test_bit test_bit_le
1016 #define ext4_find_next_zero_bit find_next_zero_bit_le
1017 #define ext4_find_next_bit find_next_bit_le
1018
1019 extern void ext4_set_bits(void *bm, int cur, int len);
1020
1021 /*
1022 * Maximal mount counts between two filesystem checks
1023 */
1024 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1025 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1026
1027 /*
1028 * Behaviour when detecting errors
1029 */
1030 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1031 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1032 #define EXT4_ERRORS_PANIC 3 /* Panic */
1033 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1034
1035 /* Metadata checksum algorithm codes */
1036 #define EXT4_CRC32C_CHKSUM 1
1037
1038 /*
1039 * Structure of the super block
1040 */
1041 struct ext4_super_block {
1042 /*00*/ __le32 s_inodes_count; /* Inodes count */
1043 __le32 s_blocks_count_lo; /* Blocks count */
1044 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1045 __le32 s_free_blocks_count_lo; /* Free blocks count */
1046 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1047 __le32 s_first_data_block; /* First Data Block */
1048 __le32 s_log_block_size; /* Block size */
1049 __le32 s_log_cluster_size; /* Allocation cluster size */
1050 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1051 __le32 s_clusters_per_group; /* # Clusters per group */
1052 __le32 s_inodes_per_group; /* # Inodes per group */
1053 __le32 s_mtime; /* Mount time */
1054 /*30*/ __le32 s_wtime; /* Write time */
1055 __le16 s_mnt_count; /* Mount count */
1056 __le16 s_max_mnt_count; /* Maximal mount count */
1057 __le16 s_magic; /* Magic signature */
1058 __le16 s_state; /* File system state */
1059 __le16 s_errors; /* Behaviour when detecting errors */
1060 __le16 s_minor_rev_level; /* minor revision level */
1061 /*40*/ __le32 s_lastcheck; /* time of last check */
1062 __le32 s_checkinterval; /* max. time between checks */
1063 __le32 s_creator_os; /* OS */
1064 __le32 s_rev_level; /* Revision level */
1065 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1066 __le16 s_def_resgid; /* Default gid for reserved blocks */
1067 /*
1068 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1069 *
1070 * Note: the difference between the compatible feature set and
1071 * the incompatible feature set is that if there is a bit set
1072 * in the incompatible feature set that the kernel doesn't
1073 * know about, it should refuse to mount the filesystem.
1074 *
1075 * e2fsck's requirements are more strict; if it doesn't know
1076 * about a feature in either the compatible or incompatible
1077 * feature set, it must abort and not try to meddle with
1078 * things it doesn't understand...
1079 */
1080 __le32 s_first_ino; /* First non-reserved inode */
1081 __le16 s_inode_size; /* size of inode structure */
1082 __le16 s_block_group_nr; /* block group # of this superblock */
1083 __le32 s_feature_compat; /* compatible feature set */
1084 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1085 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1086 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1087 /*78*/ char s_volume_name[16]; /* volume name */
1088 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1089 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1090 /*
1091 * Performance hints. Directory preallocation should only
1092 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1093 */
1094 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1095 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1096 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1097 /*
1098 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1099 */
1100 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1101 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1102 __le32 s_journal_dev; /* device number of journal file */
1103 __le32 s_last_orphan; /* start of list of inodes to delete */
1104 __le32 s_hash_seed[4]; /* HTREE hash seed */
1105 __u8 s_def_hash_version; /* Default hash version to use */
1106 __u8 s_jnl_backup_type;
1107 __le16 s_desc_size; /* size of group descriptor */
1108 /*100*/ __le32 s_default_mount_opts;
1109 __le32 s_first_meta_bg; /* First metablock block group */
1110 __le32 s_mkfs_time; /* When the filesystem was created */
1111 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1112 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1113 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1114 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1115 __le32 s_free_blocks_count_hi; /* Free blocks count */
1116 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1117 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1118 __le32 s_flags; /* Miscellaneous flags */
1119 __le16 s_raid_stride; /* RAID stride */
1120 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1121 __le64 s_mmp_block; /* Block for multi-mount protection */
1122 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1123 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1124 __u8 s_checksum_type; /* metadata checksum algorithm used */
1125 __le16 s_reserved_pad;
1126 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1127 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1128 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1129 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1130 snapshot's future use */
1131 __le32 s_snapshot_list; /* inode number of the head of the
1132 on-disk snapshot list */
1133 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1134 __le32 s_error_count; /* number of fs errors */
1135 __le32 s_first_error_time; /* first time an error happened */
1136 __le32 s_first_error_ino; /* inode involved in first error */
1137 __le64 s_first_error_block; /* block involved of first error */
1138 __u8 s_first_error_func[32]; /* function where the error happened */
1139 __le32 s_first_error_line; /* line number where error happened */
1140 __le32 s_last_error_time; /* most recent time of an error */
1141 __le32 s_last_error_ino; /* inode involved in last error */
1142 __le32 s_last_error_line; /* line number where error happened */
1143 __le64 s_last_error_block; /* block involved of last error */
1144 __u8 s_last_error_func[32]; /* function where the error happened */
1145 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1146 __u8 s_mount_opts[64];
1147 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1148 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1149 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1150 __le32 s_reserved[108]; /* Padding to the end of the block */
1151 __le32 s_checksum; /* crc32c(superblock) */
1152 };
1153
1154 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1155
1156 #ifdef __KERNEL__
1157
1158 /*
1159 * run-time mount flags
1160 */
1161 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1162 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1163
1164 /*
1165 * fourth extended-fs super-block data in memory
1166 */
1167 struct ext4_sb_info {
1168 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1169 unsigned long s_inodes_per_block;/* Number of inodes per block */
1170 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1171 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1172 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1173 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1174 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1175 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1176 ext4_group_t s_groups_count; /* Number of groups in the fs */
1177 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1178 unsigned long s_overhead; /* # of fs overhead clusters */
1179 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1180 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1181 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1182 struct buffer_head * s_sbh; /* Buffer containing the super block */
1183 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1184 struct buffer_head **s_group_desc;
1185 unsigned int s_mount_opt;
1186 unsigned int s_mount_opt2;
1187 unsigned int s_mount_flags;
1188 unsigned int s_def_mount_opt;
1189 ext4_fsblk_t s_sb_block;
1190 kuid_t s_resuid;
1191 kgid_t s_resgid;
1192 unsigned short s_mount_state;
1193 unsigned short s_pad;
1194 int s_addr_per_block_bits;
1195 int s_desc_per_block_bits;
1196 int s_inode_size;
1197 int s_first_ino;
1198 unsigned int s_inode_readahead_blks;
1199 unsigned int s_inode_goal;
1200 spinlock_t s_next_gen_lock;
1201 u32 s_next_generation;
1202 u32 s_hash_seed[4];
1203 int s_def_hash_version;
1204 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1205 struct percpu_counter s_freeclusters_counter;
1206 struct percpu_counter s_freeinodes_counter;
1207 struct percpu_counter s_dirs_counter;
1208 struct percpu_counter s_dirtyclusters_counter;
1209 struct blockgroup_lock *s_blockgroup_lock;
1210 struct proc_dir_entry *s_proc;
1211 struct kobject s_kobj;
1212 struct completion s_kobj_unregister;
1213 struct super_block *s_sb;
1214
1215 /* Journaling */
1216 struct journal_s *s_journal;
1217 struct list_head s_orphan;
1218 struct mutex s_orphan_lock;
1219 unsigned long s_resize_flags; /* Flags indicating if there
1220 is a resizer */
1221 unsigned long s_commit_interval;
1222 u32 s_max_batch_time;
1223 u32 s_min_batch_time;
1224 struct block_device *journal_bdev;
1225 #ifdef CONFIG_QUOTA
1226 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1227 int s_jquota_fmt; /* Format of quota to use */
1228 #endif
1229 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1230 struct rb_root system_blks;
1231
1232 #ifdef EXTENTS_STATS
1233 /* ext4 extents stats */
1234 unsigned long s_ext_min;
1235 unsigned long s_ext_max;
1236 unsigned long s_depth_max;
1237 spinlock_t s_ext_stats_lock;
1238 unsigned long s_ext_blocks;
1239 unsigned long s_ext_extents;
1240 #endif
1241
1242 /* for buddy allocator */
1243 struct ext4_group_info ***s_group_info;
1244 struct inode *s_buddy_cache;
1245 spinlock_t s_md_lock;
1246 unsigned short *s_mb_offsets;
1247 unsigned int *s_mb_maxs;
1248 unsigned int s_group_info_size;
1249
1250 /* tunables */
1251 unsigned long s_stripe;
1252 unsigned int s_mb_stream_request;
1253 unsigned int s_mb_max_to_scan;
1254 unsigned int s_mb_min_to_scan;
1255 unsigned int s_mb_stats;
1256 unsigned int s_mb_order2_reqs;
1257 unsigned int s_mb_group_prealloc;
1258 unsigned int s_max_writeback_mb_bump;
1259 unsigned int s_max_dir_size_kb;
1260 /* where last allocation was done - for stream allocation */
1261 unsigned long s_mb_last_group;
1262 unsigned long s_mb_last_start;
1263
1264 /* stats for buddy allocator */
1265 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1266 atomic_t s_bal_success; /* we found long enough chunks */
1267 atomic_t s_bal_allocated; /* in blocks */
1268 atomic_t s_bal_ex_scanned; /* total extents scanned */
1269 atomic_t s_bal_goals; /* goal hits */
1270 atomic_t s_bal_breaks; /* too long searches */
1271 atomic_t s_bal_2orders; /* 2^order hits */
1272 spinlock_t s_bal_lock;
1273 unsigned long s_mb_buddies_generated;
1274 unsigned long long s_mb_generation_time;
1275 atomic_t s_mb_lost_chunks;
1276 atomic_t s_mb_preallocated;
1277 atomic_t s_mb_discarded;
1278 atomic_t s_lock_busy;
1279
1280 /* locality groups */
1281 struct ext4_locality_group __percpu *s_locality_groups;
1282
1283 /* for write statistics */
1284 unsigned long s_sectors_written_start;
1285 u64 s_kbytes_written;
1286
1287 /* the size of zero-out chunk */
1288 unsigned int s_extent_max_zeroout_kb;
1289
1290 unsigned int s_log_groups_per_flex;
1291 struct flex_groups *s_flex_groups;
1292 ext4_group_t s_flex_groups_allocated;
1293
1294 /* workqueue for dio unwritten */
1295 struct workqueue_struct *dio_unwritten_wq;
1296
1297 /* timer for periodic error stats printing */
1298 struct timer_list s_err_report;
1299
1300 /* Lazy inode table initialization info */
1301 struct ext4_li_request *s_li_request;
1302 /* Wait multiplier for lazy initialization thread */
1303 unsigned int s_li_wait_mult;
1304
1305 /* Kernel thread for multiple mount protection */
1306 struct task_struct *s_mmp_tsk;
1307
1308 /* record the last minlen when FITRIM is called. */
1309 atomic_t s_last_trim_minblks;
1310
1311 /* Reference to checksum algorithm driver via cryptoapi */
1312 struct crypto_shash *s_chksum_driver;
1313
1314 /* Precomputed FS UUID checksum for seeding other checksums */
1315 __u32 s_csum_seed;
1316 };
1317
1318 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1319 {
1320 return sb->s_fs_info;
1321 }
1322 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1323 {
1324 return container_of(inode, struct ext4_inode_info, vfs_inode);
1325 }
1326
1327 static inline struct timespec ext4_current_time(struct inode *inode)
1328 {
1329 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1330 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1331 }
1332
1333 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1334 {
1335 return ino == EXT4_ROOT_INO ||
1336 ino == EXT4_USR_QUOTA_INO ||
1337 ino == EXT4_GRP_QUOTA_INO ||
1338 ino == EXT4_JOURNAL_INO ||
1339 ino == EXT4_RESIZE_INO ||
1340 (ino >= EXT4_FIRST_INO(sb) &&
1341 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1342 }
1343
1344 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1345 struct ext4_io_end *io_end)
1346 {
1347 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1348 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1349 atomic_inc(&EXT4_I(inode)->i_unwritten);
1350 }
1351 }
1352
1353 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1354 {
1355 return inode->i_private;
1356 }
1357
1358 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1359 {
1360 inode->i_private = io;
1361 }
1362
1363 /*
1364 * Inode dynamic state flags
1365 */
1366 enum {
1367 EXT4_STATE_JDATA, /* journaled data exists */
1368 EXT4_STATE_NEW, /* inode is newly created */
1369 EXT4_STATE_XATTR, /* has in-inode xattrs */
1370 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1371 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1372 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1373 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1374 EXT4_STATE_NEWENTRY, /* File just added to dir */
1375 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1376 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1377 nolocking */
1378 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1379 };
1380
1381 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1382 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1383 { \
1384 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1385 } \
1386 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1387 { \
1388 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1389 } \
1390 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1391 { \
1392 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1393 }
1394
1395 EXT4_INODE_BIT_FNS(flag, flags, 0)
1396 #if (BITS_PER_LONG < 64)
1397 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1398
1399 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1400 {
1401 (ei)->i_state_flags = 0;
1402 }
1403 #else
1404 EXT4_INODE_BIT_FNS(state, flags, 32)
1405
1406 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1407 {
1408 /* We depend on the fact that callers will set i_flags */
1409 }
1410 #endif
1411 #else
1412 /* Assume that user mode programs are passing in an ext4fs superblock, not
1413 * a kernel struct super_block. This will allow us to call the feature-test
1414 * macros from user land. */
1415 #define EXT4_SB(sb) (sb)
1416 #endif
1417
1418 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1419
1420 /*
1421 * Codes for operating systems
1422 */
1423 #define EXT4_OS_LINUX 0
1424 #define EXT4_OS_HURD 1
1425 #define EXT4_OS_MASIX 2
1426 #define EXT4_OS_FREEBSD 3
1427 #define EXT4_OS_LITES 4
1428
1429 /*
1430 * Revision levels
1431 */
1432 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1433 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1434
1435 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1436 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1437
1438 #define EXT4_GOOD_OLD_INODE_SIZE 128
1439
1440 /*
1441 * Feature set definitions
1442 */
1443
1444 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1445 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1446 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1447 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1448 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1449 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1450 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1451 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1452 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1453 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1454 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1455 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1456 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1457 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1458 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1459 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1460 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1461 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1462
1463 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1464 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1465 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1466 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1467 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1468 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1469
1470 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1471 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1472 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1473 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1474 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1475 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1476 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1477 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1478 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1479 /*
1480 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1481 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1482 * all other data structures' checksums. However, the METADATA_CSUM and
1483 * GDT_CSUM bits are mutually exclusive.
1484 */
1485 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1486
1487 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1488 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1489 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1490 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1491 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1492 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1493 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1494 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1495 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1496 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1497 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1498 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1499 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1500 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1501
1502 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1503 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1504 EXT4_FEATURE_INCOMPAT_META_BG)
1505 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1506 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1507 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1508
1509 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1510 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1511 EXT4_FEATURE_INCOMPAT_RECOVER| \
1512 EXT4_FEATURE_INCOMPAT_META_BG)
1513 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1514 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1515 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1516
1517 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1518 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1519 EXT4_FEATURE_INCOMPAT_RECOVER| \
1520 EXT4_FEATURE_INCOMPAT_META_BG| \
1521 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1522 EXT4_FEATURE_INCOMPAT_64BIT| \
1523 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1524 EXT4_FEATURE_INCOMPAT_MMP | \
1525 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1526 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1527 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1528 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1529 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1530 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1531 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1532 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1533 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1534 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1535 EXT4_FEATURE_RO_COMPAT_QUOTA)
1536
1537 /*
1538 * Default values for user and/or group using reserved blocks
1539 */
1540 #define EXT4_DEF_RESUID 0
1541 #define EXT4_DEF_RESGID 0
1542
1543 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1544
1545 /*
1546 * Default mount options
1547 */
1548 #define EXT4_DEFM_DEBUG 0x0001
1549 #define EXT4_DEFM_BSDGROUPS 0x0002
1550 #define EXT4_DEFM_XATTR_USER 0x0004
1551 #define EXT4_DEFM_ACL 0x0008
1552 #define EXT4_DEFM_UID16 0x0010
1553 #define EXT4_DEFM_JMODE 0x0060
1554 #define EXT4_DEFM_JMODE_DATA 0x0020
1555 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1556 #define EXT4_DEFM_JMODE_WBACK 0x0060
1557 #define EXT4_DEFM_NOBARRIER 0x0100
1558 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1559 #define EXT4_DEFM_DISCARD 0x0400
1560 #define EXT4_DEFM_NODELALLOC 0x0800
1561
1562 /*
1563 * Default journal batch times
1564 */
1565 #define EXT4_DEF_MIN_BATCH_TIME 0
1566 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1567
1568 /*
1569 * Minimum number of groups in a flexgroup before we separate out
1570 * directories into the first block group of a flexgroup
1571 */
1572 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1573
1574 /*
1575 * Structure of a directory entry
1576 */
1577 #define EXT4_NAME_LEN 255
1578
1579 struct ext4_dir_entry {
1580 __le32 inode; /* Inode number */
1581 __le16 rec_len; /* Directory entry length */
1582 __le16 name_len; /* Name length */
1583 char name[EXT4_NAME_LEN]; /* File name */
1584 };
1585
1586 /*
1587 * The new version of the directory entry. Since EXT4 structures are
1588 * stored in intel byte order, and the name_len field could never be
1589 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1590 * file_type field.
1591 */
1592 struct ext4_dir_entry_2 {
1593 __le32 inode; /* Inode number */
1594 __le16 rec_len; /* Directory entry length */
1595 __u8 name_len; /* Name length */
1596 __u8 file_type;
1597 char name[EXT4_NAME_LEN]; /* File name */
1598 };
1599
1600 /*
1601 * This is a bogus directory entry at the end of each leaf block that
1602 * records checksums.
1603 */
1604 struct ext4_dir_entry_tail {
1605 __le32 det_reserved_zero1; /* Pretend to be unused */
1606 __le16 det_rec_len; /* 12 */
1607 __u8 det_reserved_zero2; /* Zero name length */
1608 __u8 det_reserved_ft; /* 0xDE, fake file type */
1609 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1610 };
1611
1612 #define EXT4_DIRENT_TAIL(block, blocksize) \
1613 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1614 ((blocksize) - \
1615 sizeof(struct ext4_dir_entry_tail))))
1616
1617 /*
1618 * Ext4 directory file types. Only the low 3 bits are used. The
1619 * other bits are reserved for now.
1620 */
1621 #define EXT4_FT_UNKNOWN 0
1622 #define EXT4_FT_REG_FILE 1
1623 #define EXT4_FT_DIR 2
1624 #define EXT4_FT_CHRDEV 3
1625 #define EXT4_FT_BLKDEV 4
1626 #define EXT4_FT_FIFO 5
1627 #define EXT4_FT_SOCK 6
1628 #define EXT4_FT_SYMLINK 7
1629
1630 #define EXT4_FT_MAX 8
1631
1632 #define EXT4_FT_DIR_CSUM 0xDE
1633
1634 /*
1635 * EXT4_DIR_PAD defines the directory entries boundaries
1636 *
1637 * NOTE: It must be a multiple of 4
1638 */
1639 #define EXT4_DIR_PAD 4
1640 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1641 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1642 ~EXT4_DIR_ROUND)
1643 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1644
1645 /*
1646 * If we ever get support for fs block sizes > page_size, we'll need
1647 * to remove the #if statements in the next two functions...
1648 */
1649 static inline unsigned int
1650 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1651 {
1652 unsigned len = le16_to_cpu(dlen);
1653
1654 #if (PAGE_CACHE_SIZE >= 65536)
1655 if (len == EXT4_MAX_REC_LEN || len == 0)
1656 return blocksize;
1657 return (len & 65532) | ((len & 3) << 16);
1658 #else
1659 return len;
1660 #endif
1661 }
1662
1663 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1664 {
1665 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1666 BUG();
1667 #if (PAGE_CACHE_SIZE >= 65536)
1668 if (len < 65536)
1669 return cpu_to_le16(len);
1670 if (len == blocksize) {
1671 if (blocksize == 65536)
1672 return cpu_to_le16(EXT4_MAX_REC_LEN);
1673 else
1674 return cpu_to_le16(0);
1675 }
1676 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1677 #else
1678 return cpu_to_le16(len);
1679 #endif
1680 }
1681
1682 /*
1683 * Hash Tree Directory indexing
1684 * (c) Daniel Phillips, 2001
1685 */
1686
1687 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1688 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1689 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1690 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1691 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1692
1693 /* Legal values for the dx_root hash_version field: */
1694
1695 #define DX_HASH_LEGACY 0
1696 #define DX_HASH_HALF_MD4 1
1697 #define DX_HASH_TEA 2
1698 #define DX_HASH_LEGACY_UNSIGNED 3
1699 #define DX_HASH_HALF_MD4_UNSIGNED 4
1700 #define DX_HASH_TEA_UNSIGNED 5
1701
1702 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1703 const void *address, unsigned int length)
1704 {
1705 struct {
1706 struct shash_desc shash;
1707 char ctx[4];
1708 } desc;
1709 int err;
1710
1711 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1712
1713 desc.shash.tfm = sbi->s_chksum_driver;
1714 desc.shash.flags = 0;
1715 *(u32 *)desc.ctx = crc;
1716
1717 err = crypto_shash_update(&desc.shash, address, length);
1718 BUG_ON(err);
1719
1720 return *(u32 *)desc.ctx;
1721 }
1722
1723 #ifdef __KERNEL__
1724
1725 /* hash info structure used by the directory hash */
1726 struct dx_hash_info
1727 {
1728 u32 hash;
1729 u32 minor_hash;
1730 int hash_version;
1731 u32 *seed;
1732 };
1733
1734
1735 /* 32 and 64 bit signed EOF for dx directories */
1736 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1737 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1738
1739
1740 /*
1741 * Control parameters used by ext4_htree_next_block
1742 */
1743 #define HASH_NB_ALWAYS 1
1744
1745
1746 /*
1747 * Describe an inode's exact location on disk and in memory
1748 */
1749 struct ext4_iloc
1750 {
1751 struct buffer_head *bh;
1752 unsigned long offset;
1753 ext4_group_t block_group;
1754 };
1755
1756 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1757 {
1758 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1759 }
1760
1761 /*
1762 * This structure is stuffed into the struct file's private_data field
1763 * for directories. It is where we put information so that we can do
1764 * readdir operations in hash tree order.
1765 */
1766 struct dir_private_info {
1767 struct rb_root root;
1768 struct rb_node *curr_node;
1769 struct fname *extra_fname;
1770 loff_t last_pos;
1771 __u32 curr_hash;
1772 __u32 curr_minor_hash;
1773 __u32 next_hash;
1774 };
1775
1776 /* calculate the first block number of the group */
1777 static inline ext4_fsblk_t
1778 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1779 {
1780 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1781 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1782 }
1783
1784 /*
1785 * Special error return code only used by dx_probe() and its callers.
1786 */
1787 #define ERR_BAD_DX_DIR -75000
1788
1789 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1790 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1791
1792 /*
1793 * Timeout and state flag for lazy initialization inode thread.
1794 */
1795 #define EXT4_DEF_LI_WAIT_MULT 10
1796 #define EXT4_DEF_LI_MAX_START_DELAY 5
1797 #define EXT4_LAZYINIT_QUIT 0x0001
1798 #define EXT4_LAZYINIT_RUNNING 0x0002
1799
1800 /*
1801 * Lazy inode table initialization info
1802 */
1803 struct ext4_lazy_init {
1804 unsigned long li_state;
1805 struct list_head li_request_list;
1806 struct mutex li_list_mtx;
1807 };
1808
1809 struct ext4_li_request {
1810 struct super_block *lr_super;
1811 struct ext4_sb_info *lr_sbi;
1812 ext4_group_t lr_next_group;
1813 struct list_head lr_request;
1814 unsigned long lr_next_sched;
1815 unsigned long lr_timeout;
1816 };
1817
1818 struct ext4_features {
1819 struct kobject f_kobj;
1820 struct completion f_kobj_unregister;
1821 };
1822
1823 /*
1824 * This structure will be used for multiple mount protection. It will be
1825 * written into the block number saved in the s_mmp_block field in the
1826 * superblock. Programs that check MMP should assume that if
1827 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1828 * to use the filesystem, regardless of how old the timestamp is.
1829 */
1830 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1831 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1832 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1833 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1834
1835 struct mmp_struct {
1836 __le32 mmp_magic; /* Magic number for MMP */
1837 __le32 mmp_seq; /* Sequence no. updated periodically */
1838
1839 /*
1840 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1841 * purposes and do not affect the correctness of the algorithm
1842 */
1843 __le64 mmp_time; /* Time last updated */
1844 char mmp_nodename[64]; /* Node which last updated MMP block */
1845 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1846
1847 /*
1848 * mmp_check_interval is used to verify if the MMP block has been
1849 * updated on the block device. The value is updated based on the
1850 * maximum time to write the MMP block during an update cycle.
1851 */
1852 __le16 mmp_check_interval;
1853
1854 __le16 mmp_pad1;
1855 __le32 mmp_pad2[226];
1856 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1857 };
1858
1859 /* arguments passed to the mmp thread */
1860 struct mmpd_data {
1861 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1862 struct super_block *sb; /* super block of the fs */
1863 };
1864
1865 /*
1866 * Check interval multiplier
1867 * The MMP block is written every update interval and initially checked every
1868 * update interval x the multiplier (the value is then adapted based on the
1869 * write latency). The reason is that writes can be delayed under load and we
1870 * don't want readers to incorrectly assume that the filesystem is no longer
1871 * in use.
1872 */
1873 #define EXT4_MMP_CHECK_MULT 2UL
1874
1875 /*
1876 * Minimum interval for MMP checking in seconds.
1877 */
1878 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1879
1880 /*
1881 * Maximum interval for MMP checking in seconds.
1882 */
1883 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1884
1885 /*
1886 * Function prototypes
1887 */
1888
1889 /*
1890 * Ok, these declarations are also in <linux/kernel.h> but none of the
1891 * ext4 source programs needs to include it so they are duplicated here.
1892 */
1893 # define NORET_TYPE /**/
1894 # define ATTRIB_NORET __attribute__((noreturn))
1895 # define NORET_AND noreturn,
1896
1897 /* bitmap.c */
1898 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1899 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1900 struct ext4_group_desc *gdp,
1901 struct buffer_head *bh, int sz);
1902 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1903 struct ext4_group_desc *gdp,
1904 struct buffer_head *bh, int sz);
1905 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1906 struct ext4_group_desc *gdp,
1907 struct buffer_head *bh);
1908 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1909 struct ext4_group_desc *gdp,
1910 struct buffer_head *bh);
1911
1912 /* balloc.c */
1913 extern void ext4_validate_block_bitmap(struct super_block *sb,
1914 struct ext4_group_desc *desc,
1915 unsigned int block_group,
1916 struct buffer_head *bh);
1917 extern unsigned int ext4_block_group(struct super_block *sb,
1918 ext4_fsblk_t blocknr);
1919 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1920 ext4_fsblk_t blocknr);
1921 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1922 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1923 ext4_group_t group);
1924 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1925 ext4_fsblk_t goal,
1926 unsigned int flags,
1927 unsigned long *count,
1928 int *errp);
1929 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1930 s64 nclusters, unsigned int flags);
1931 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1932 extern void ext4_check_blocks_bitmap(struct super_block *);
1933 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1934 ext4_group_t block_group,
1935 struct buffer_head ** bh);
1936 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1937
1938 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1939 ext4_group_t block_group);
1940 extern int ext4_wait_block_bitmap(struct super_block *sb,
1941 ext4_group_t block_group,
1942 struct buffer_head *bh);
1943 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1944 ext4_group_t block_group);
1945 extern void ext4_init_block_bitmap(struct super_block *sb,
1946 struct buffer_head *bh,
1947 ext4_group_t group,
1948 struct ext4_group_desc *desc);
1949 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1950 ext4_group_t block_group,
1951 struct ext4_group_desc *gdp);
1952 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1953 ext4_group_t block_group,
1954 struct ext4_group_desc *gdp);
1955 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1956
1957 /* dir.c */
1958 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1959 struct file *,
1960 struct ext4_dir_entry_2 *,
1961 struct buffer_head *, char *, int,
1962 unsigned int);
1963 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1964 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1965 (de), (bh), (buf), (size), (offset)))
1966 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1967 __u32 minor_hash,
1968 struct ext4_dir_entry_2 *dirent);
1969 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1970 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1971 struct buffer_head *bh,
1972 void *buf, int buf_size,
1973 const char *name, int namelen,
1974 struct ext4_dir_entry_2 **dest_de);
1975 void ext4_insert_dentry(struct inode *inode,
1976 struct ext4_dir_entry_2 *de,
1977 int buf_size,
1978 const char *name, int namelen);
1979 static inline void ext4_update_dx_flag(struct inode *inode)
1980 {
1981 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
1982 EXT4_FEATURE_COMPAT_DIR_INDEX))
1983 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
1984 }
1985 static unsigned char ext4_filetype_table[] = {
1986 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1987 };
1988
1989 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
1990 {
1991 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
1992 (filetype >= EXT4_FT_MAX))
1993 return DT_UNKNOWN;
1994
1995 return ext4_filetype_table[filetype];
1996 }
1997
1998 /* fsync.c */
1999 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2000 extern int ext4_flush_unwritten_io(struct inode *);
2001
2002 /* hash.c */
2003 extern int ext4fs_dirhash(const char *name, int len, struct
2004 dx_hash_info *hinfo);
2005
2006 /* ialloc.c */
2007 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2008 const struct qstr *qstr, __u32 goal,
2009 uid_t *owner, int handle_type,
2010 unsigned int line_no, int nblocks);
2011
2012 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2013 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2014 0, 0, 0)
2015 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2016 type, nblocks) \
2017 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2018 (type), __LINE__, (nblocks))
2019
2020
2021 extern void ext4_free_inode(handle_t *, struct inode *);
2022 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2023 extern unsigned long ext4_count_free_inodes(struct super_block *);
2024 extern unsigned long ext4_count_dirs(struct super_block *);
2025 extern void ext4_check_inodes_bitmap(struct super_block *);
2026 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2027 extern int ext4_init_inode_table(struct super_block *sb,
2028 ext4_group_t group, int barrier);
2029 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2030
2031 /* mballoc.c */
2032 extern long ext4_mb_stats;
2033 extern long ext4_mb_max_to_scan;
2034 extern int ext4_mb_init(struct super_block *);
2035 extern int ext4_mb_release(struct super_block *);
2036 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2037 struct ext4_allocation_request *, int *);
2038 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2039 extern void ext4_discard_preallocations(struct inode *);
2040 extern int __init ext4_init_mballoc(void);
2041 extern void ext4_exit_mballoc(void);
2042 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2043 struct buffer_head *bh, ext4_fsblk_t block,
2044 unsigned long count, int flags);
2045 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2046 ext4_group_t ngroups);
2047 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2048 ext4_group_t i, struct ext4_group_desc *desc);
2049 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2050 ext4_fsblk_t block, unsigned long count);
2051 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2052
2053 /* inode.c */
2054 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2055 ext4_lblk_t, int, int *);
2056 struct buffer_head *ext4_bread(handle_t *, struct inode *,
2057 ext4_lblk_t, int, int *);
2058 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2059 struct buffer_head *bh_result, int create);
2060 int ext4_get_block(struct inode *inode, sector_t iblock,
2061 struct buffer_head *bh_result, int create);
2062 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2063 struct buffer_head *bh, int create);
2064 int ext4_walk_page_buffers(handle_t *handle,
2065 struct buffer_head *head,
2066 unsigned from,
2067 unsigned to,
2068 int *partial,
2069 int (*fn)(handle_t *handle,
2070 struct buffer_head *bh));
2071 int do_journal_get_write_access(handle_t *handle,
2072 struct buffer_head *bh);
2073 #define FALL_BACK_TO_NONDELALLOC 1
2074 #define CONVERT_INLINE_DATA 2
2075
2076 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2077 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2078 extern int ext4_setattr(struct dentry *, struct iattr *);
2079 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2080 struct kstat *stat);
2081 extern void ext4_evict_inode(struct inode *);
2082 extern void ext4_clear_inode(struct inode *);
2083 extern int ext4_sync_inode(handle_t *, struct inode *);
2084 extern void ext4_dirty_inode(struct inode *, int);
2085 extern int ext4_change_inode_journal_flag(struct inode *, int);
2086 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2087 extern int ext4_can_truncate(struct inode *inode);
2088 extern void ext4_truncate(struct inode *);
2089 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2090 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2091 extern void ext4_set_inode_flags(struct inode *);
2092 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2093 extern int ext4_alloc_da_blocks(struct inode *inode);
2094 extern void ext4_set_aops(struct inode *inode);
2095 extern int ext4_writepage_trans_blocks(struct inode *);
2096 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2097 extern int ext4_discard_partial_page_buffers(handle_t *handle,
2098 struct address_space *mapping, loff_t from,
2099 loff_t length, int flags);
2100 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2101 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2102 extern void ext4_da_update_reserve_space(struct inode *inode,
2103 int used, int quota_claim);
2104
2105 /* indirect.c */
2106 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2107 struct ext4_map_blocks *map, int flags);
2108 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2109 const struct iovec *iov, loff_t offset,
2110 unsigned long nr_segs);
2111 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2112 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
2113 extern void ext4_ind_truncate(struct inode *inode);
2114 extern int ext4_ind_punch_hole(struct file *file, loff_t offset, loff_t length);
2115
2116 /* ioctl.c */
2117 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2118 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2119
2120 /* migrate.c */
2121 extern int ext4_ext_migrate(struct inode *);
2122
2123 /* namei.c */
2124 extern int ext4_dirent_csum_verify(struct inode *inode,
2125 struct ext4_dir_entry *dirent);
2126 extern int ext4_orphan_add(handle_t *, struct inode *);
2127 extern int ext4_orphan_del(handle_t *, struct inode *);
2128 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2129 __u32 start_minor_hash, __u32 *next_hash);
2130 extern int search_dir(struct buffer_head *bh,
2131 char *search_buf,
2132 int buf_size,
2133 struct inode *dir,
2134 const struct qstr *d_name,
2135 unsigned int offset,
2136 struct ext4_dir_entry_2 **res_dir);
2137 extern int ext4_generic_delete_entry(handle_t *handle,
2138 struct inode *dir,
2139 struct ext4_dir_entry_2 *de_del,
2140 struct buffer_head *bh,
2141 void *entry_buf,
2142 int buf_size,
2143 int csum_size);
2144
2145 /* resize.c */
2146 extern int ext4_group_add(struct super_block *sb,
2147 struct ext4_new_group_data *input);
2148 extern int ext4_group_extend(struct super_block *sb,
2149 struct ext4_super_block *es,
2150 ext4_fsblk_t n_blocks_count);
2151 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2152
2153 /* super.c */
2154 extern int ext4_calculate_overhead(struct super_block *sb);
2155 extern int ext4_superblock_csum_verify(struct super_block *sb,
2156 struct ext4_super_block *es);
2157 extern void ext4_superblock_csum_set(struct super_block *sb);
2158 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2159 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2160 extern void ext4_kvfree(void *ptr);
2161 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2162 ext4_group_t ngroup);
2163 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2164 char nbuf[16]);
2165 extern __printf(4, 5)
2166 void __ext4_error(struct super_block *, const char *, unsigned int,
2167 const char *, ...);
2168 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2169 __LINE__, ## message)
2170 extern __printf(5, 6)
2171 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2172 const char *, ...);
2173 extern __printf(5, 6)
2174 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2175 const char *, ...);
2176 extern void __ext4_std_error(struct super_block *, const char *,
2177 unsigned int, int);
2178 extern __printf(4, 5)
2179 void __ext4_abort(struct super_block *, const char *, unsigned int,
2180 const char *, ...);
2181 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2182 __LINE__, ## message)
2183 extern __printf(4, 5)
2184 void __ext4_warning(struct super_block *, const char *, unsigned int,
2185 const char *, ...);
2186 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2187 __LINE__, ## message)
2188 extern __printf(3, 4)
2189 void ext4_msg(struct super_block *, const char *, const char *, ...);
2190 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2191 const char *, unsigned int, const char *);
2192 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2193 __LINE__, msg)
2194 extern __printf(7, 8)
2195 void __ext4_grp_locked_error(const char *, unsigned int,
2196 struct super_block *, ext4_group_t,
2197 unsigned long, ext4_fsblk_t,
2198 const char *, ...);
2199 #define ext4_grp_locked_error(sb, grp, message...) \
2200 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2201 extern void ext4_update_dynamic_rev(struct super_block *sb);
2202 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2203 __u32 compat);
2204 extern int ext4_update_rocompat_feature(handle_t *handle,
2205 struct super_block *sb, __u32 rocompat);
2206 extern int ext4_update_incompat_feature(handle_t *handle,
2207 struct super_block *sb, __u32 incompat);
2208 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2209 struct ext4_group_desc *bg);
2210 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2211 struct ext4_group_desc *bg);
2212 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2213 struct ext4_group_desc *bg);
2214 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2215 struct ext4_group_desc *bg);
2216 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2217 struct ext4_group_desc *bg);
2218 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2219 struct ext4_group_desc *bg);
2220 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2221 struct ext4_group_desc *bg);
2222 extern void ext4_block_bitmap_set(struct super_block *sb,
2223 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2224 extern void ext4_inode_bitmap_set(struct super_block *sb,
2225 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2226 extern void ext4_inode_table_set(struct super_block *sb,
2227 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2228 extern void ext4_free_group_clusters_set(struct super_block *sb,
2229 struct ext4_group_desc *bg,
2230 __u32 count);
2231 extern void ext4_free_inodes_set(struct super_block *sb,
2232 struct ext4_group_desc *bg, __u32 count);
2233 extern void ext4_used_dirs_set(struct super_block *sb,
2234 struct ext4_group_desc *bg, __u32 count);
2235 extern void ext4_itable_unused_set(struct super_block *sb,
2236 struct ext4_group_desc *bg, __u32 count);
2237 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2238 struct ext4_group_desc *gdp);
2239 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2240 struct ext4_group_desc *gdp);
2241 extern int ext4_register_li_request(struct super_block *sb,
2242 ext4_group_t first_not_zeroed);
2243
2244 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2245 {
2246 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2247 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2248 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2249 }
2250
2251 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2252 {
2253 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2254 le32_to_cpu(es->s_blocks_count_lo);
2255 }
2256
2257 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2258 {
2259 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2260 le32_to_cpu(es->s_r_blocks_count_lo);
2261 }
2262
2263 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2264 {
2265 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2266 le32_to_cpu(es->s_free_blocks_count_lo);
2267 }
2268
2269 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2270 ext4_fsblk_t blk)
2271 {
2272 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2273 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2274 }
2275
2276 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2277 ext4_fsblk_t blk)
2278 {
2279 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2280 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2281 }
2282
2283 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2284 ext4_fsblk_t blk)
2285 {
2286 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2287 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2288 }
2289
2290 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2291 {
2292 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2293 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2294 le32_to_cpu(raw_inode->i_size_lo);
2295 else
2296 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2297 }
2298
2299 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2300 {
2301 raw_inode->i_size_lo = cpu_to_le32(i_size);
2302 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2303 }
2304
2305 static inline
2306 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2307 ext4_group_t group)
2308 {
2309 struct ext4_group_info ***grp_info;
2310 long indexv, indexh;
2311 grp_info = EXT4_SB(sb)->s_group_info;
2312 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2313 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2314 return grp_info[indexv][indexh];
2315 }
2316
2317 /*
2318 * Reading s_groups_count requires using smp_rmb() afterwards. See
2319 * the locking protocol documented in the comments of ext4_group_add()
2320 * in resize.c
2321 */
2322 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2323 {
2324 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2325
2326 smp_rmb();
2327 return ngroups;
2328 }
2329
2330 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2331 ext4_group_t block_group)
2332 {
2333 return block_group >> sbi->s_log_groups_per_flex;
2334 }
2335
2336 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2337 {
2338 return 1 << sbi->s_log_groups_per_flex;
2339 }
2340
2341 #define ext4_std_error(sb, errno) \
2342 do { \
2343 if ((errno)) \
2344 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2345 } while (0)
2346
2347 #ifdef CONFIG_SMP
2348 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2349 * counters. So we need to make sure we have free clusters more
2350 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2351 */
2352 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2353 #else
2354 #define EXT4_FREECLUSTERS_WATERMARK 0
2355 #endif
2356
2357 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2358 {
2359 /*
2360 * XXX: replace with spinlock if seen contended -bzzz
2361 */
2362 down_write(&EXT4_I(inode)->i_data_sem);
2363 if (newsize > EXT4_I(inode)->i_disksize)
2364 EXT4_I(inode)->i_disksize = newsize;
2365 up_write(&EXT4_I(inode)->i_data_sem);
2366 return ;
2367 }
2368
2369 struct ext4_group_info {
2370 unsigned long bb_state;
2371 struct rb_root bb_free_root;
2372 ext4_grpblk_t bb_first_free; /* first free block */
2373 ext4_grpblk_t bb_free; /* total free blocks */
2374 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2375 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2376 struct list_head bb_prealloc_list;
2377 #ifdef DOUBLE_CHECK
2378 void *bb_bitmap;
2379 #endif
2380 struct rw_semaphore alloc_sem;
2381 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2382 * regions, index is order.
2383 * bb_counters[3] = 5 means
2384 * 5 free 8-block regions. */
2385 };
2386
2387 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2388 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2389
2390 #define EXT4_MB_GRP_NEED_INIT(grp) \
2391 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2392
2393 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2394 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2395 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2396 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2397 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2398 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2399
2400 #define EXT4_MAX_CONTENTION 8
2401 #define EXT4_CONTENTION_THRESHOLD 2
2402
2403 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2404 ext4_group_t group)
2405 {
2406 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2407 }
2408
2409 /*
2410 * Returns true if the filesystem is busy enough that attempts to
2411 * access the block group locks has run into contention.
2412 */
2413 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2414 {
2415 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2416 }
2417
2418 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2419 {
2420 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2421 if (spin_trylock(lock))
2422 /*
2423 * We're able to grab the lock right away, so drop the
2424 * lock contention counter.
2425 */
2426 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2427 else {
2428 /*
2429 * The lock is busy, so bump the contention counter,
2430 * and then wait on the spin lock.
2431 */
2432 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2433 EXT4_MAX_CONTENTION);
2434 spin_lock(lock);
2435 }
2436 }
2437
2438 static inline void ext4_unlock_group(struct super_block *sb,
2439 ext4_group_t group)
2440 {
2441 spin_unlock(ext4_group_lock_ptr(sb, group));
2442 }
2443
2444 /*
2445 * Block validity checking
2446 */
2447 #define ext4_check_indirect_blockref(inode, bh) \
2448 ext4_check_blockref(__func__, __LINE__, inode, \
2449 (__le32 *)(bh)->b_data, \
2450 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2451
2452 #define ext4_ind_check_inode(inode) \
2453 ext4_check_blockref(__func__, __LINE__, inode, \
2454 EXT4_I(inode)->i_data, \
2455 EXT4_NDIR_BLOCKS)
2456
2457 /*
2458 * Inodes and files operations
2459 */
2460
2461 /* dir.c */
2462 extern const struct file_operations ext4_dir_operations;
2463
2464 /* file.c */
2465 extern const struct inode_operations ext4_file_inode_operations;
2466 extern const struct file_operations ext4_file_operations;
2467 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2468 extern void ext4_unwritten_wait(struct inode *inode);
2469
2470 /* inline.c */
2471 extern int ext4_has_inline_data(struct inode *inode);
2472 extern int ext4_get_inline_size(struct inode *inode);
2473 extern int ext4_get_max_inline_size(struct inode *inode);
2474 extern int ext4_find_inline_data_nolock(struct inode *inode);
2475 extern void ext4_write_inline_data(struct inode *inode,
2476 struct ext4_iloc *iloc,
2477 void *buffer, loff_t pos,
2478 unsigned int len);
2479 extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
2480 unsigned int len);
2481 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2482 unsigned int len);
2483 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2484
2485 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2486 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2487 struct inode *inode,
2488 loff_t pos, unsigned len,
2489 unsigned flags,
2490 struct page **pagep);
2491 extern int ext4_write_inline_data_end(struct inode *inode,
2492 loff_t pos, unsigned len,
2493 unsigned copied,
2494 struct page *page);
2495 extern struct buffer_head *
2496 ext4_journalled_write_inline_data(struct inode *inode,
2497 unsigned len,
2498 struct page *page);
2499 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2500 struct inode *inode,
2501 loff_t pos, unsigned len,
2502 unsigned flags,
2503 struct page **pagep,
2504 void **fsdata);
2505 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2506 unsigned len, unsigned copied,
2507 struct page *page);
2508 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2509 struct inode *inode);
2510 extern int ext4_try_create_inline_dir(handle_t *handle,
2511 struct inode *parent,
2512 struct inode *inode);
2513 extern int ext4_read_inline_dir(struct file *filp,
2514 void *dirent, filldir_t filldir,
2515 int *has_inline_data);
2516 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2517 const struct qstr *d_name,
2518 struct ext4_dir_entry_2 **res_dir,
2519 int *has_inline_data);
2520 extern int ext4_delete_inline_entry(handle_t *handle,
2521 struct inode *dir,
2522 struct ext4_dir_entry_2 *de_del,
2523 struct buffer_head *bh,
2524 int *has_inline_data);
2525 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2526 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2527 struct ext4_dir_entry_2 **parent_de,
2528 int *retval);
2529 extern int ext4_inline_data_fiemap(struct inode *inode,
2530 struct fiemap_extent_info *fieinfo,
2531 int *has_inline);
2532 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2533 struct inode *inode,
2534 int needed);
2535 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2536
2537 extern int ext4_convert_inline_data(struct inode *inode);
2538
2539 /* namei.c */
2540 extern const struct inode_operations ext4_dir_inode_operations;
2541 extern const struct inode_operations ext4_special_inode_operations;
2542 extern struct dentry *ext4_get_parent(struct dentry *child);
2543 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2544 struct ext4_dir_entry_2 *de,
2545 int blocksize, int csum_size,
2546 unsigned int parent_ino, int dotdot_real_len);
2547 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2548 unsigned int blocksize);
2549 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2550 struct inode *inode,
2551 struct buffer_head *bh);
2552
2553 /* symlink.c */
2554 extern const struct inode_operations ext4_symlink_inode_operations;
2555 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2556
2557 /* block_validity */
2558 extern void ext4_release_system_zone(struct super_block *sb);
2559 extern int ext4_setup_system_zone(struct super_block *sb);
2560 extern int __init ext4_init_system_zone(void);
2561 extern void ext4_exit_system_zone(void);
2562 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2563 ext4_fsblk_t start_blk,
2564 unsigned int count);
2565 extern int ext4_check_blockref(const char *, unsigned int,
2566 struct inode *, __le32 *, unsigned int);
2567
2568 /* extents.c */
2569 struct ext4_ext_path;
2570 struct ext4_extent;
2571
2572 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2573 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2574 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2575 int chunk);
2576 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2577 struct ext4_map_blocks *map, int flags);
2578 extern void ext4_ext_truncate(struct inode *);
2579 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2580 loff_t length);
2581 extern void ext4_ext_init(struct super_block *);
2582 extern void ext4_ext_release(struct super_block *);
2583 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2584 loff_t len);
2585 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2586 ssize_t len);
2587 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2588 struct ext4_map_blocks *map, int flags);
2589 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2590 ext4_lblk_t lblocks);
2591 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2592 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2593 int num,
2594 struct ext4_ext_path *path);
2595 extern int ext4_can_extents_be_merged(struct inode *inode,
2596 struct ext4_extent *ex1,
2597 struct ext4_extent *ex2);
2598 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2599 struct ext4_ext_path *,
2600 struct ext4_extent *, int);
2601 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2602 struct ext4_ext_path *);
2603 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2604 extern int ext4_ext_check_inode(struct inode *inode);
2605 extern int ext4_find_delalloc_range(struct inode *inode,
2606 ext4_lblk_t lblk_start,
2607 ext4_lblk_t lblk_end);
2608 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2609 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2610 __u64 start, __u64 len);
2611
2612
2613 /* move_extent.c */
2614 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2615 __u64 start_orig, __u64 start_donor,
2616 __u64 len, __u64 *moved_len);
2617
2618 /* page-io.c */
2619 extern int __init ext4_init_pageio(void);
2620 extern void ext4_add_complete_io(ext4_io_end_t *io_end);
2621 extern void ext4_exit_pageio(void);
2622 extern void ext4_ioend_wait(struct inode *);
2623 extern void ext4_free_io_end(ext4_io_end_t *io);
2624 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2625 extern void ext4_end_io_work(struct work_struct *work);
2626 extern void ext4_io_submit(struct ext4_io_submit *io);
2627 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2628 struct page *page,
2629 int len,
2630 struct writeback_control *wbc);
2631
2632 /* mmp.c */
2633 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2634 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2635 extern int ext4_mmp_csum_verify(struct super_block *sb,
2636 struct mmp_struct *mmp);
2637
2638 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2639 enum ext4_state_bits {
2640 BH_Uninit /* blocks are allocated but uninitialized on disk */
2641 = BH_JBDPrivateStart,
2642 BH_AllocFromCluster, /* allocated blocks were part of already
2643 * allocated cluster. Note that this flag will
2644 * never, ever appear in a buffer_head's state
2645 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2646 * this is used. */
2647 };
2648
2649 BUFFER_FNS(Uninit, uninit)
2650 TAS_BUFFER_FNS(Uninit, uninit)
2651
2652 /*
2653 * Add new method to test whether block and inode bitmaps are properly
2654 * initialized. With uninit_bg reading the block from disk is not enough
2655 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2656 */
2657 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2658
2659 static inline int bitmap_uptodate(struct buffer_head *bh)
2660 {
2661 return (buffer_uptodate(bh) &&
2662 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2663 }
2664 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2665 {
2666 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2667 }
2668
2669 /*
2670 * Disable DIO read nolock optimization, so new dioreaders will be forced
2671 * to grab i_mutex
2672 */
2673 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2674 {
2675 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2676 smp_mb();
2677 }
2678 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2679 {
2680 smp_mb();
2681 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2682 }
2683
2684 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2685
2686 /* For ioend & aio unwritten conversion wait queues */
2687 #define EXT4_WQ_HASH_SZ 37
2688 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2689 EXT4_WQ_HASH_SZ])
2690 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2691 EXT4_WQ_HASH_SZ])
2692 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2693 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2694
2695 #define EXT4_RESIZING 0
2696 extern int ext4_resize_begin(struct super_block *sb);
2697 extern void ext4_resize_end(struct super_block *sb);
2698
2699 #endif /* __KERNEL__ */
2700
2701 #endif /* _EXT4_H */
kernel source for telekom puls (alcatel/mediatek)