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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / fs / ext4 / ext4.h
blob9983ba859e99fe66c39072905cf4291d202e2fbc
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 #ifdef __KERNEL__
33 #include <linux/compat.h>
34 #endif
35
36 /*
37 * The fourth extended filesystem constants/structures
38 */
39
40 /*
41 * Define EXT4FS_DEBUG to produce debug messages
42 */
43 #undef EXT4FS_DEBUG
44
45 /*
46 * Debug code
47 */
48 #ifdef EXT4FS_DEBUG
49 #define ext4_debug(f, a...) \
50 do { \
51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
52 __FILE__, __LINE__, __func__); \
53 printk(KERN_DEBUG f, ## a); \
54 } while (0)
55 #else
56 #define ext4_debug(f, a...) do {} while (0)
57 #endif
58
59 #define EXT4_ERROR_INODE(inode, fmt, a...) \
60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
61
62 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
64
65 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
66 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
67
68 /* data type for block offset of block group */
69 typedef int ext4_grpblk_t;
70
71 /* data type for filesystem-wide blocks number */
72 typedef unsigned long long ext4_fsblk_t;
73
74 /* data type for file logical block number */
75 typedef __u32 ext4_lblk_t;
76
77 /* data type for block group number */
78 typedef unsigned int ext4_group_t;
79
80 /*
81 * Flags used in mballoc's allocation_context flags field.
82 *
83 * Also used to show what's going on for debugging purposes when the
84 * flag field is exported via the traceport interface
85 */
86
87 /* prefer goal again. length */
88 #define EXT4_MB_HINT_MERGE 0x0001
89 /* blocks already reserved */
90 #define EXT4_MB_HINT_RESERVED 0x0002
91 /* metadata is being allocated */
92 #define EXT4_MB_HINT_METADATA 0x0004
93 /* first blocks in the file */
94 #define EXT4_MB_HINT_FIRST 0x0008
95 /* search for the best chunk */
96 #define EXT4_MB_HINT_BEST 0x0010
97 /* data is being allocated */
98 #define EXT4_MB_HINT_DATA 0x0020
99 /* don't preallocate (for tails) */
100 #define EXT4_MB_HINT_NOPREALLOC 0x0040
101 /* allocate for locality group */
102 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
103 /* allocate goal blocks or none */
104 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
105 /* goal is meaningful */
106 #define EXT4_MB_HINT_TRY_GOAL 0x0200
107 /* blocks already pre-reserved by delayed allocation */
108 #define EXT4_MB_DELALLOC_RESERVED 0x0400
109 /* We are doing stream allocation */
110 #define EXT4_MB_STREAM_ALLOC 0x0800
111 /* Use reserved root blocks if needed */
112 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
113
114 struct ext4_allocation_request {
115 /* target inode for block we're allocating */
116 struct inode *inode;
117 /* how many blocks we want to allocate */
118 unsigned int len;
119 /* logical block in target inode */
120 ext4_lblk_t logical;
121 /* the closest logical allocated block to the left */
122 ext4_lblk_t lleft;
123 /* the closest logical allocated block to the right */
124 ext4_lblk_t lright;
125 /* phys. target (a hint) */
126 ext4_fsblk_t goal;
127 /* phys. block for the closest logical allocated block to the left */
128 ext4_fsblk_t pleft;
129 /* phys. block for the closest logical allocated block to the right */
130 ext4_fsblk_t pright;
131 /* flags. see above EXT4_MB_HINT_* */
132 unsigned int flags;
133 };
134
135 /*
136 * Logical to physical block mapping, used by ext4_map_blocks()
137 *
138 * This structure is used to pass requests into ext4_map_blocks() as
139 * well as to store the information returned by ext4_map_blocks(). It
140 * takes less room on the stack than a struct buffer_head.
141 */
142 #define EXT4_MAP_NEW (1 << BH_New)
143 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
144 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
145 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
146 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
147 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
148 * ext4_map_blocks wants to know whether or not the underlying cluster has
149 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
150 * the requested mapping was from previously mapped (or delayed allocated)
151 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
152 * should never appear on buffer_head's state flags.
153 */
154 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
155 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
156 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
157 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
158
159 struct ext4_map_blocks {
160 ext4_fsblk_t m_pblk;
161 ext4_lblk_t m_lblk;
162 unsigned int m_len;
163 unsigned int m_flags;
164 };
165
166 /*
167 * For delayed allocation tracking
168 */
169 struct mpage_da_data {
170 struct inode *inode;
171 sector_t b_blocknr; /* start block number of extent */
172 size_t b_size; /* size of extent */
173 unsigned long b_state; /* state of the extent */
174 unsigned long first_page, next_page; /* extent of pages */
175 struct writeback_control *wbc;
176 int io_done;
177 int pages_written;
178 int retval;
179 };
180
181 /*
182 * Flags for ext4_io_end->flags
183 */
184 #define EXT4_IO_END_UNWRITTEN 0x0001
185 #define EXT4_IO_END_ERROR 0x0002
186 #define EXT4_IO_END_QUEUED 0x0004
187 #define EXT4_IO_END_DIRECT 0x0008
188 #define EXT4_IO_END_IN_FSYNC 0x0010
189
190 struct ext4_io_page {
191 struct page *p_page;
192 atomic_t p_count;
193 };
194
195 #define MAX_IO_PAGES 128
196
197 typedef struct ext4_io_end {
198 struct list_head list; /* per-file finished IO list */
199 struct inode *inode; /* file being written to */
200 unsigned int flag; /* unwritten or not */
201 struct page *page; /* page struct for buffer write */
202 loff_t offset; /* offset in the file */
203 ssize_t size; /* size of the extent */
204 struct work_struct work; /* data work queue */
205 struct kiocb *iocb; /* iocb struct for AIO */
206 int result; /* error value for AIO */
207 int num_io_pages;
208 struct ext4_io_page *pages[MAX_IO_PAGES];
209 } ext4_io_end_t;
210
211 struct ext4_io_submit {
212 int io_op;
213 struct bio *io_bio;
214 ext4_io_end_t *io_end;
215 struct ext4_io_page *io_page;
216 sector_t io_next_block;
217 };
218
219 /*
220 * Special inodes numbers
221 */
222 #define EXT4_BAD_INO 1 /* Bad blocks inode */
223 #define EXT4_ROOT_INO 2 /* Root inode */
224 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
225 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
226 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
227 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
228 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
229 #define EXT4_JOURNAL_INO 8 /* Journal inode */
230
231 /* First non-reserved inode for old ext4 filesystems */
232 #define EXT4_GOOD_OLD_FIRST_INO 11
233
234 /*
235 * Maximal count of links to a file
236 */
237 #define EXT4_LINK_MAX 65000
238
239 /*
240 * Macro-instructions used to manage several block sizes
241 */
242 #define EXT4_MIN_BLOCK_SIZE 1024
243 #define EXT4_MAX_BLOCK_SIZE 65536
244 #define EXT4_MIN_BLOCK_LOG_SIZE 10
245 #define EXT4_MAX_BLOCK_LOG_SIZE 16
246 #ifdef __KERNEL__
247 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
248 #else
249 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
250 #endif
251 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
252 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
253 EXT4_SB(s)->s_cluster_bits)
254 #ifdef __KERNEL__
255 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
256 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
257 #else
258 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
259 #endif
260 #ifdef __KERNEL__
261 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
262 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
263 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
264 #else
265 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
266 EXT4_GOOD_OLD_INODE_SIZE : \
267 (s)->s_inode_size)
268 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
269 EXT4_GOOD_OLD_FIRST_INO : \
270 (s)->s_first_ino)
271 #endif
272 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
273
274 /* Translate a block number to a cluster number */
275 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
276 /* Translate a cluster number to a block number */
277 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
278 /* Translate # of blks to # of clusters */
279 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
280 (sbi)->s_cluster_bits)
281
282 /*
283 * Structure of a blocks group descriptor
284 */
285 struct ext4_group_desc
286 {
287 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
288 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
289 __le32 bg_inode_table_lo; /* Inodes table block */
290 __le16 bg_free_blocks_count_lo;/* Free blocks count */
291 __le16 bg_free_inodes_count_lo;/* Free inodes count */
292 __le16 bg_used_dirs_count_lo; /* Directories count */
293 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
294 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
295 __le16 bg_itable_unused_lo; /* Unused inodes count */
296 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
297 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
298 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
299 __le32 bg_inode_table_hi; /* Inodes table block MSB */
300 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
301 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
302 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
303 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
304 __u32 bg_reserved2[3];
305 };
306
307 /*
308 * Structure of a flex block group info
309 */
310
311 struct flex_groups {
312 atomic_t free_inodes;
313 atomic_t free_clusters;
314 atomic_t used_dirs;
315 };
316
317 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
318 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
319 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
320
321 /*
322 * Macro-instructions used to manage group descriptors
323 */
324 #define EXT4_MIN_DESC_SIZE 32
325 #define EXT4_MIN_DESC_SIZE_64BIT 64
326 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
327 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
328 #ifdef __KERNEL__
329 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
330 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
331 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
332 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
333 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
334 #else
335 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
336 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
337 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
338 #endif
339
340 /*
341 * Constants relative to the data blocks
342 */
343 #define EXT4_NDIR_BLOCKS 12
344 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
345 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
346 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
347 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
348
349 /*
350 * Inode flags
351 */
352 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
353 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
354 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
355 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
356 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
357 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
358 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
359 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
360 /* Reserved for compression usage... */
361 #define EXT4_DIRTY_FL 0x00000100
362 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
363 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
364 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
365 /* End compression flags --- maybe not all used */
366 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
367 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
368 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
369 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
370 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
371 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
372 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
373 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
374 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
375 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
376 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
377
378 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
379 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
380
381 /* Flags that should be inherited by new inodes from their parent. */
382 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
383 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
384 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
385 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
386
387 /* Flags that are appropriate for regular files (all but dir-specific ones). */
388 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
389
390 /* Flags that are appropriate for non-directories/regular files. */
391 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
392
393 /* Mask out flags that are inappropriate for the given type of inode. */
394 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
395 {
396 if (S_ISDIR(mode))
397 return flags;
398 else if (S_ISREG(mode))
399 return flags & EXT4_REG_FLMASK;
400 else
401 return flags & EXT4_OTHER_FLMASK;
402 }
403
404 /*
405 * Inode flags used for atomic set/get
406 */
407 enum {
408 EXT4_INODE_SECRM = 0, /* Secure deletion */
409 EXT4_INODE_UNRM = 1, /* Undelete */
410 EXT4_INODE_COMPR = 2, /* Compress file */
411 EXT4_INODE_SYNC = 3, /* Synchronous updates */
412 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
413 EXT4_INODE_APPEND = 5, /* writes to file may only append */
414 EXT4_INODE_NODUMP = 6, /* do not dump file */
415 EXT4_INODE_NOATIME = 7, /* do not update atime */
416 /* Reserved for compression usage... */
417 EXT4_INODE_DIRTY = 8,
418 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
419 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
420 EXT4_INODE_ECOMPR = 11, /* Compression error */
421 /* End compression flags --- maybe not all used */
422 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
423 EXT4_INODE_IMAGIC = 13, /* AFS directory */
424 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
425 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
426 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
427 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
428 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
429 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
430 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
431 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
432 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
433 };
434
435 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
436 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
437 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
438 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
439
440 /*
441 * Since it's pretty easy to mix up bit numbers and hex values, and we
442 * can't do a compile-time test for ENUM values, we use a run-time
443 * test to make sure that EXT4_XXX_FL is consistent with respect to
444 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
445 * out so it won't cost any extra space in the compiled kernel image.
446 * But it's important that these values are the same, since we are
447 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
448 * must be consistent with the values of FS_XXX_FL defined in
449 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
450 * ext4 filesystems, and of course the values defined in e2fsprogs.
451 *
452 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
453 */
454 static inline void ext4_check_flag_values(void)
455 {
456 CHECK_FLAG_VALUE(SECRM);
457 CHECK_FLAG_VALUE(UNRM);
458 CHECK_FLAG_VALUE(COMPR);
459 CHECK_FLAG_VALUE(SYNC);
460 CHECK_FLAG_VALUE(IMMUTABLE);
461 CHECK_FLAG_VALUE(APPEND);
462 CHECK_FLAG_VALUE(NODUMP);
463 CHECK_FLAG_VALUE(NOATIME);
464 CHECK_FLAG_VALUE(DIRTY);
465 CHECK_FLAG_VALUE(COMPRBLK);
466 CHECK_FLAG_VALUE(NOCOMPR);
467 CHECK_FLAG_VALUE(ECOMPR);
468 CHECK_FLAG_VALUE(INDEX);
469 CHECK_FLAG_VALUE(IMAGIC);
470 CHECK_FLAG_VALUE(JOURNAL_DATA);
471 CHECK_FLAG_VALUE(NOTAIL);
472 CHECK_FLAG_VALUE(DIRSYNC);
473 CHECK_FLAG_VALUE(TOPDIR);
474 CHECK_FLAG_VALUE(HUGE_FILE);
475 CHECK_FLAG_VALUE(EXTENTS);
476 CHECK_FLAG_VALUE(EA_INODE);
477 CHECK_FLAG_VALUE(EOFBLOCKS);
478 CHECK_FLAG_VALUE(RESERVED);
479 }
480
481 /* Used to pass group descriptor data when online resize is done */
482 struct ext4_new_group_input {
483 __u32 group; /* Group number for this data */
484 __u64 block_bitmap; /* Absolute block number of block bitmap */
485 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
486 __u64 inode_table; /* Absolute block number of inode table start */
487 __u32 blocks_count; /* Total number of blocks in this group */
488 __u16 reserved_blocks; /* Number of reserved blocks in this group */
489 __u16 unused;
490 };
491
492 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
493 struct compat_ext4_new_group_input {
494 u32 group;
495 compat_u64 block_bitmap;
496 compat_u64 inode_bitmap;
497 compat_u64 inode_table;
498 u32 blocks_count;
499 u16 reserved_blocks;
500 u16 unused;
501 };
502 #endif
503
504 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
505 struct ext4_new_group_data {
506 __u32 group;
507 __u64 block_bitmap;
508 __u64 inode_bitmap;
509 __u64 inode_table;
510 __u32 blocks_count;
511 __u16 reserved_blocks;
512 __u16 unused;
513 __u32 free_blocks_count;
514 };
515
516 /* Indexes used to index group tables in ext4_new_group_data */
517 enum {
518 BLOCK_BITMAP = 0, /* block bitmap */
519 INODE_BITMAP, /* inode bitmap */
520 INODE_TABLE, /* inode tables */
521 GROUP_TABLE_COUNT,
522 };
523
524 /*
525 * Flags used by ext4_map_blocks()
526 */
527 /* Allocate any needed blocks and/or convert an unitialized
528 extent to be an initialized ext4 */
529 #define EXT4_GET_BLOCKS_CREATE 0x0001
530 /* Request the creation of an unitialized extent */
531 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
532 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
533 EXT4_GET_BLOCKS_CREATE)
534 /* Caller is from the delayed allocation writeout path,
535 so set the magic i_delalloc_reserve_flag after taking the
536 inode allocation semaphore for */
537 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
538 /* caller is from the direct IO path, request to creation of an
539 unitialized extents if not allocated, split the uninitialized
540 extent if blocks has been preallocated already*/
541 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
542 #define EXT4_GET_BLOCKS_CONVERT 0x0010
543 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
544 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
545 /* Convert extent to initialized after IO complete */
546 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
547 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
548 /* Punch out blocks of an extent */
549 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
550 /* Don't normalize allocation size (used for fallocate) */
551 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
552 /* Request will not result in inode size update (user for fallocate) */
553 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
554
555 /*
556 * Flags used by ext4_free_blocks
557 */
558 #define EXT4_FREE_BLOCKS_METADATA 0x0001
559 #define EXT4_FREE_BLOCKS_FORGET 0x0002
560 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
561 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
562 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
563 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
564
565 /*
566 * Flags used by ext4_discard_partial_page_buffers
567 */
568 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
569
570 /*
571 * ioctl commands
572 */
573 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
574 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
575 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
576 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
577 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
578 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
579 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
580 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
581 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
582 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
583 #define EXT4_IOC_MIGRATE _IO('f', 9)
584 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
585 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
586 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
587 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
588 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
589
590 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
591 /*
592 * ioctl commands in 32 bit emulation
593 */
594 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
595 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
596 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
597 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
598 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
599 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
600 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
601 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
602 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
603 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
604 #endif
605
606 /* Max physical block we can address w/o extents */
607 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
608
609 /*
610 * Structure of an inode on the disk
611 */
612 struct ext4_inode {
613 __le16 i_mode; /* File mode */
614 __le16 i_uid; /* Low 16 bits of Owner Uid */
615 __le32 i_size_lo; /* Size in bytes */
616 __le32 i_atime; /* Access time */
617 __le32 i_ctime; /* Inode Change time */
618 __le32 i_mtime; /* Modification time */
619 __le32 i_dtime; /* Deletion Time */
620 __le16 i_gid; /* Low 16 bits of Group Id */
621 __le16 i_links_count; /* Links count */
622 __le32 i_blocks_lo; /* Blocks count */
623 __le32 i_flags; /* File flags */
624 union {
625 struct {
626 __le32 l_i_version;
627 } linux1;
628 struct {
629 __u32 h_i_translator;
630 } hurd1;
631 struct {
632 __u32 m_i_reserved1;
633 } masix1;
634 } osd1; /* OS dependent 1 */
635 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
636 __le32 i_generation; /* File version (for NFS) */
637 __le32 i_file_acl_lo; /* File ACL */
638 __le32 i_size_high;
639 __le32 i_obso_faddr; /* Obsoleted fragment address */
640 union {
641 struct {
642 __le16 l_i_blocks_high; /* were l_i_reserved1 */
643 __le16 l_i_file_acl_high;
644 __le16 l_i_uid_high; /* these 2 fields */
645 __le16 l_i_gid_high; /* were reserved2[0] */
646 __u32 l_i_reserved2;
647 } linux2;
648 struct {
649 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
650 __u16 h_i_mode_high;
651 __u16 h_i_uid_high;
652 __u16 h_i_gid_high;
653 __u32 h_i_author;
654 } hurd2;
655 struct {
656 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
657 __le16 m_i_file_acl_high;
658 __u32 m_i_reserved2[2];
659 } masix2;
660 } osd2; /* OS dependent 2 */
661 __le16 i_extra_isize;
662 __le16 i_pad1;
663 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
664 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
665 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
666 __le32 i_crtime; /* File Creation time */
667 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
668 __le32 i_version_hi; /* high 32 bits for 64-bit version */
669 };
670
671 struct move_extent {
672 __u32 reserved; /* should be zero */
673 __u32 donor_fd; /* donor file descriptor */
674 __u64 orig_start; /* logical start offset in block for orig */
675 __u64 donor_start; /* logical start offset in block for donor */
676 __u64 len; /* block length to be moved */
677 __u64 moved_len; /* moved block length */
678 };
679
680 #define EXT4_EPOCH_BITS 2
681 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
682 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
683
684 /*
685 * Extended fields will fit into an inode if the filesystem was formatted
686 * with large inodes (-I 256 or larger) and there are not currently any EAs
687 * consuming all of the available space. For new inodes we always reserve
688 * enough space for the kernel's known extended fields, but for inodes
689 * created with an old kernel this might not have been the case. None of
690 * the extended inode fields is critical for correct filesystem operation.
691 * This macro checks if a certain field fits in the inode. Note that
692 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
693 */
694 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
695 ((offsetof(typeof(*ext4_inode), field) + \
696 sizeof((ext4_inode)->field)) \
697 <= (EXT4_GOOD_OLD_INODE_SIZE + \
698 (einode)->i_extra_isize)) \
699
700 static inline __le32 ext4_encode_extra_time(struct timespec *time)
701 {
702 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
703 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
704 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
705 }
706
707 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
708 {
709 if (sizeof(time->tv_sec) > 4)
710 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
711 << 32;
712 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
713 }
714
715 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
716 do { \
717 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
718 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
719 (raw_inode)->xtime ## _extra = \
720 ext4_encode_extra_time(&(inode)->xtime); \
721 } while (0)
722
723 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
724 do { \
725 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
726 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
727 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
728 (raw_inode)->xtime ## _extra = \
729 ext4_encode_extra_time(&(einode)->xtime); \
730 } while (0)
731
732 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
733 do { \
734 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
735 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
736 ext4_decode_extra_time(&(inode)->xtime, \
737 raw_inode->xtime ## _extra); \
738 else \
739 (inode)->xtime.tv_nsec = 0; \
740 } while (0)
741
742 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
743 do { \
744 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
745 (einode)->xtime.tv_sec = \
746 (signed)le32_to_cpu((raw_inode)->xtime); \
747 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
748 ext4_decode_extra_time(&(einode)->xtime, \
749 raw_inode->xtime ## _extra); \
750 else \
751 (einode)->xtime.tv_nsec = 0; \
752 } while (0)
753
754 #define i_disk_version osd1.linux1.l_i_version
755
756 #if defined(__KERNEL__) || defined(__linux__)
757 #define i_reserved1 osd1.linux1.l_i_reserved1
758 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
759 #define i_blocks_high osd2.linux2.l_i_blocks_high
760 #define i_uid_low i_uid
761 #define i_gid_low i_gid
762 #define i_uid_high osd2.linux2.l_i_uid_high
763 #define i_gid_high osd2.linux2.l_i_gid_high
764 #define i_reserved2 osd2.linux2.l_i_reserved2
765
766 #elif defined(__GNU__)
767
768 #define i_translator osd1.hurd1.h_i_translator
769 #define i_uid_high osd2.hurd2.h_i_uid_high
770 #define i_gid_high osd2.hurd2.h_i_gid_high
771 #define i_author osd2.hurd2.h_i_author
772
773 #elif defined(__masix__)
774
775 #define i_reserved1 osd1.masix1.m_i_reserved1
776 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
777 #define i_reserved2 osd2.masix2.m_i_reserved2
778
779 #endif /* defined(__KERNEL__) || defined(__linux__) */
780
781 /*
782 * storage for cached extent
783 * If ec_len == 0, then the cache is invalid.
784 * If ec_start == 0, then the cache represents a gap (null mapping)
785 */
786 struct ext4_ext_cache {
787 ext4_fsblk_t ec_start;
788 ext4_lblk_t ec_block;
789 __u32 ec_len; /* must be 32bit to return holes */
790 };
791
792 /*
793 * fourth extended file system inode data in memory
794 */
795 struct ext4_inode_info {
796 __le32 i_data[15]; /* unconverted */
797 __u32 i_dtime;
798 ext4_fsblk_t i_file_acl;
799
800 /*
801 * i_block_group is the number of the block group which contains
802 * this file's inode. Constant across the lifetime of the inode,
803 * it is ued for making block allocation decisions - we try to
804 * place a file's data blocks near its inode block, and new inodes
805 * near to their parent directory's inode.
806 */
807 ext4_group_t i_block_group;
808 ext4_lblk_t i_dir_start_lookup;
809 #if (BITS_PER_LONG < 64)
810 unsigned long i_state_flags; /* Dynamic state flags */
811 #endif
812 unsigned long i_flags;
813
814 #ifdef CONFIG_EXT4_FS_XATTR
815 /*
816 * Extended attributes can be read independently of the main file
817 * data. Taking i_mutex even when reading would cause contention
818 * between readers of EAs and writers of regular file data, so
819 * instead we synchronize on xattr_sem when reading or changing
820 * EAs.
821 */
822 struct rw_semaphore xattr_sem;
823 #endif
824
825 struct list_head i_orphan; /* unlinked but open inodes */
826
827 /*
828 * i_disksize keeps track of what the inode size is ON DISK, not
829 * in memory. During truncate, i_size is set to the new size by
830 * the VFS prior to calling ext4_truncate(), but the filesystem won't
831 * set i_disksize to 0 until the truncate is actually under way.
832 *
833 * The intent is that i_disksize always represents the blocks which
834 * are used by this file. This allows recovery to restart truncate
835 * on orphans if we crash during truncate. We actually write i_disksize
836 * into the on-disk inode when writing inodes out, instead of i_size.
837 *
838 * The only time when i_disksize and i_size may be different is when
839 * a truncate is in progress. The only things which change i_disksize
840 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
841 */
842 loff_t i_disksize;
843
844 /*
845 * i_data_sem is for serialising ext4_truncate() against
846 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
847 * data tree are chopped off during truncate. We can't do that in
848 * ext4 because whenever we perform intermediate commits during
849 * truncate, the inode and all the metadata blocks *must* be in a
850 * consistent state which allows truncation of the orphans to restart
851 * during recovery. Hence we must fix the get_block-vs-truncate race
852 * by other means, so we have i_data_sem.
853 */
854 struct rw_semaphore i_data_sem;
855 struct inode vfs_inode;
856 struct jbd2_inode *jinode;
857
858 struct ext4_ext_cache i_cached_extent;
859 /*
860 * File creation time. Its function is same as that of
861 * struct timespec i_{a,c,m}time in the generic inode.
862 */
863 struct timespec i_crtime;
864
865 /* mballoc */
866 struct list_head i_prealloc_list;
867 spinlock_t i_prealloc_lock;
868
869 /* ialloc */
870 ext4_group_t i_last_alloc_group;
871
872 /* allocation reservation info for delalloc */
873 /* In case of bigalloc, these refer to clusters rather than blocks */
874 unsigned int i_reserved_data_blocks;
875 unsigned int i_reserved_meta_blocks;
876 unsigned int i_allocated_meta_blocks;
877 ext4_lblk_t i_da_metadata_calc_last_lblock;
878 int i_da_metadata_calc_len;
879
880 /* on-disk additional length */
881 __u16 i_extra_isize;
882
883 #ifdef CONFIG_QUOTA
884 /* quota space reservation, managed internally by quota code */
885 qsize_t i_reserved_quota;
886 #endif
887
888 /* completed IOs that might need unwritten extents handling */
889 struct list_head i_completed_io_list;
890 spinlock_t i_completed_io_lock;
891 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
892 /* current io_end structure for async DIO write*/
893 ext4_io_end_t *cur_aio_dio;
894 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
895
896 spinlock_t i_block_reservation_lock;
897
898 /*
899 * Transactions that contain inode's metadata needed to complete
900 * fsync and fdatasync, respectively.
901 */
902 tid_t i_sync_tid;
903 tid_t i_datasync_tid;
904 };
905
906 /*
907 * File system states
908 */
909 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
910 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
911 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
912
913 /*
914 * Misc. filesystem flags
915 */
916 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
917 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
918 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
919
920 /*
921 * Mount flags
922 */
923 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
924 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
925 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
926 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
927 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
928 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
929 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
930 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
931 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
932 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
933 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
934 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
935 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
936 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
937 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
938 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
939 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
940 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
941 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
942 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
943 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
944 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
945 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
946 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
947 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
948 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
949 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
950 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
951 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
952 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
953
954 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
955 specified delalloc */
956
957 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
958 ~EXT4_MOUNT_##opt
959 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
960 EXT4_MOUNT_##opt
961 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
962 EXT4_MOUNT_##opt)
963
964 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
965 ~EXT4_MOUNT2_##opt
966 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
967 EXT4_MOUNT2_##opt
968 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
969 EXT4_MOUNT2_##opt)
970
971 #define ext4_test_and_set_bit __test_and_set_bit_le
972 #define ext4_set_bit __set_bit_le
973 #define ext4_set_bit_atomic ext2_set_bit_atomic
974 #define ext4_test_and_clear_bit __test_and_clear_bit_le
975 #define ext4_clear_bit __clear_bit_le
976 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
977 #define ext4_test_bit test_bit_le
978 #define ext4_find_next_zero_bit find_next_zero_bit_le
979 #define ext4_find_next_bit find_next_bit_le
980
981 extern void ext4_set_bits(void *bm, int cur, int len);
982
983 /*
984 * Maximal mount counts between two filesystem checks
985 */
986 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
987 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
988
989 /*
990 * Behaviour when detecting errors
991 */
992 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
993 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
994 #define EXT4_ERRORS_PANIC 3 /* Panic */
995 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
996
997 /*
998 * Structure of the super block
999 */
1000 struct ext4_super_block {
1001 /*00*/ __le32 s_inodes_count; /* Inodes count */
1002 __le32 s_blocks_count_lo; /* Blocks count */
1003 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1004 __le32 s_free_blocks_count_lo; /* Free blocks count */
1005 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1006 __le32 s_first_data_block; /* First Data Block */
1007 __le32 s_log_block_size; /* Block size */
1008 __le32 s_log_cluster_size; /* Allocation cluster size */
1009 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1010 __le32 s_clusters_per_group; /* # Clusters per group */
1011 __le32 s_inodes_per_group; /* # Inodes per group */
1012 __le32 s_mtime; /* Mount time */
1013 /*30*/ __le32 s_wtime; /* Write time */
1014 __le16 s_mnt_count; /* Mount count */
1015 __le16 s_max_mnt_count; /* Maximal mount count */
1016 __le16 s_magic; /* Magic signature */
1017 __le16 s_state; /* File system state */
1018 __le16 s_errors; /* Behaviour when detecting errors */
1019 __le16 s_minor_rev_level; /* minor revision level */
1020 /*40*/ __le32 s_lastcheck; /* time of last check */
1021 __le32 s_checkinterval; /* max. time between checks */
1022 __le32 s_creator_os; /* OS */
1023 __le32 s_rev_level; /* Revision level */
1024 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1025 __le16 s_def_resgid; /* Default gid for reserved blocks */
1026 /*
1027 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1028 *
1029 * Note: the difference between the compatible feature set and
1030 * the incompatible feature set is that if there is a bit set
1031 * in the incompatible feature set that the kernel doesn't
1032 * know about, it should refuse to mount the filesystem.
1033 *
1034 * e2fsck's requirements are more strict; if it doesn't know
1035 * about a feature in either the compatible or incompatible
1036 * feature set, it must abort and not try to meddle with
1037 * things it doesn't understand...
1038 */
1039 __le32 s_first_ino; /* First non-reserved inode */
1040 __le16 s_inode_size; /* size of inode structure */
1041 __le16 s_block_group_nr; /* block group # of this superblock */
1042 __le32 s_feature_compat; /* compatible feature set */
1043 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1044 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1045 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1046 /*78*/ char s_volume_name[16]; /* volume name */
1047 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1048 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1049 /*
1050 * Performance hints. Directory preallocation should only
1051 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1052 */
1053 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1054 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1055 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1056 /*
1057 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1058 */
1059 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1060 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1061 __le32 s_journal_dev; /* device number of journal file */
1062 __le32 s_last_orphan; /* start of list of inodes to delete */
1063 __le32 s_hash_seed[4]; /* HTREE hash seed */
1064 __u8 s_def_hash_version; /* Default hash version to use */
1065 __u8 s_jnl_backup_type;
1066 __le16 s_desc_size; /* size of group descriptor */
1067 /*100*/ __le32 s_default_mount_opts;
1068 __le32 s_first_meta_bg; /* First metablock block group */
1069 __le32 s_mkfs_time; /* When the filesystem was created */
1070 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1071 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1072 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1073 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1074 __le32 s_free_blocks_count_hi; /* Free blocks count */
1075 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1076 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1077 __le32 s_flags; /* Miscellaneous flags */
1078 __le16 s_raid_stride; /* RAID stride */
1079 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1080 __le64 s_mmp_block; /* Block for multi-mount protection */
1081 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1082 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1083 __u8 s_reserved_char_pad;
1084 __le16 s_reserved_pad;
1085 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1086 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1087 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1088 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1089 snapshot's future use */
1090 __le32 s_snapshot_list; /* inode number of the head of the
1091 on-disk snapshot list */
1092 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1093 __le32 s_error_count; /* number of fs errors */
1094 __le32 s_first_error_time; /* first time an error happened */
1095 __le32 s_first_error_ino; /* inode involved in first error */
1096 __le64 s_first_error_block; /* block involved of first error */
1097 __u8 s_first_error_func[32]; /* function where the error happened */
1098 __le32 s_first_error_line; /* line number where error happened */
1099 __le32 s_last_error_time; /* most recent time of an error */
1100 __le32 s_last_error_ino; /* inode involved in last error */
1101 __le32 s_last_error_line; /* line number where error happened */
1102 __le64 s_last_error_block; /* block involved of last error */
1103 __u8 s_last_error_func[32]; /* function where the error happened */
1104 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1105 __u8 s_mount_opts[64];
1106 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1107 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1108 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1109 __le32 s_reserved[109]; /* Padding to the end of the block */
1110 };
1111
1112 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1113
1114 #ifdef __KERNEL__
1115
1116 /*
1117 * run-time mount flags
1118 */
1119 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1120 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1121
1122 /*
1123 * fourth extended-fs super-block data in memory
1124 */
1125 struct ext4_sb_info {
1126 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1127 unsigned long s_inodes_per_block;/* Number of inodes per block */
1128 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1129 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1130 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1131 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1132 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1133 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1134 ext4_group_t s_groups_count; /* Number of groups in the fs */
1135 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1136 unsigned long s_overhead_last; /* Last calculated overhead */
1137 unsigned long s_blocks_last; /* Last seen block count */
1138 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1139 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1140 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1141 struct buffer_head * s_sbh; /* Buffer containing the super block */
1142 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1143 struct buffer_head **s_group_desc;
1144 unsigned int s_mount_opt;
1145 unsigned int s_mount_opt2;
1146 unsigned int s_mount_flags;
1147 ext4_fsblk_t s_sb_block;
1148 uid_t s_resuid;
1149 gid_t s_resgid;
1150 unsigned short s_mount_state;
1151 unsigned short s_pad;
1152 int s_addr_per_block_bits;
1153 int s_desc_per_block_bits;
1154 int s_inode_size;
1155 int s_first_ino;
1156 unsigned int s_inode_readahead_blks;
1157 unsigned int s_inode_goal;
1158 spinlock_t s_next_gen_lock;
1159 u32 s_next_generation;
1160 u32 s_hash_seed[4];
1161 int s_def_hash_version;
1162 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1163 struct percpu_counter s_freeclusters_counter;
1164 struct percpu_counter s_freeinodes_counter;
1165 struct percpu_counter s_dirs_counter;
1166 struct percpu_counter s_dirtyclusters_counter;
1167 struct blockgroup_lock *s_blockgroup_lock;
1168 struct proc_dir_entry *s_proc;
1169 struct kobject s_kobj;
1170 struct completion s_kobj_unregister;
1171
1172 /* Journaling */
1173 struct journal_s *s_journal;
1174 struct list_head s_orphan;
1175 struct mutex s_orphan_lock;
1176 unsigned long s_resize_flags; /* Flags indicating if there
1177 is a resizer */
1178 unsigned long s_commit_interval;
1179 u32 s_max_batch_time;
1180 u32 s_min_batch_time;
1181 struct block_device *journal_bdev;
1182 #ifdef CONFIG_QUOTA
1183 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1184 int s_jquota_fmt; /* Format of quota to use */
1185 #endif
1186 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1187 struct rb_root system_blks;
1188
1189 #ifdef EXTENTS_STATS
1190 /* ext4 extents stats */
1191 unsigned long s_ext_min;
1192 unsigned long s_ext_max;
1193 unsigned long s_depth_max;
1194 spinlock_t s_ext_stats_lock;
1195 unsigned long s_ext_blocks;
1196 unsigned long s_ext_extents;
1197 #endif
1198
1199 /* for buddy allocator */
1200 struct ext4_group_info ***s_group_info;
1201 struct inode *s_buddy_cache;
1202 spinlock_t s_md_lock;
1203 unsigned short *s_mb_offsets;
1204 unsigned int *s_mb_maxs;
1205
1206 /* tunables */
1207 unsigned long s_stripe;
1208 unsigned int s_mb_stream_request;
1209 unsigned int s_mb_max_to_scan;
1210 unsigned int s_mb_min_to_scan;
1211 unsigned int s_mb_stats;
1212 unsigned int s_mb_order2_reqs;
1213 unsigned int s_mb_group_prealloc;
1214 unsigned int s_max_writeback_mb_bump;
1215 /* where last allocation was done - for stream allocation */
1216 unsigned long s_mb_last_group;
1217 unsigned long s_mb_last_start;
1218
1219 /* stats for buddy allocator */
1220 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1221 atomic_t s_bal_success; /* we found long enough chunks */
1222 atomic_t s_bal_allocated; /* in blocks */
1223 atomic_t s_bal_ex_scanned; /* total extents scanned */
1224 atomic_t s_bal_goals; /* goal hits */
1225 atomic_t s_bal_breaks; /* too long searches */
1226 atomic_t s_bal_2orders; /* 2^order hits */
1227 spinlock_t s_bal_lock;
1228 unsigned long s_mb_buddies_generated;
1229 unsigned long long s_mb_generation_time;
1230 atomic_t s_mb_lost_chunks;
1231 atomic_t s_mb_preallocated;
1232 atomic_t s_mb_discarded;
1233 atomic_t s_lock_busy;
1234
1235 /* locality groups */
1236 struct ext4_locality_group __percpu *s_locality_groups;
1237
1238 /* for write statistics */
1239 unsigned long s_sectors_written_start;
1240 u64 s_kbytes_written;
1241
1242 unsigned int s_log_groups_per_flex;
1243 struct flex_groups *s_flex_groups;
1244
1245 /* workqueue for dio unwritten */
1246 struct workqueue_struct *dio_unwritten_wq;
1247
1248 /* timer for periodic error stats printing */
1249 struct timer_list s_err_report;
1250
1251 /* Lazy inode table initialization info */
1252 struct ext4_li_request *s_li_request;
1253 /* Wait multiplier for lazy initialization thread */
1254 unsigned int s_li_wait_mult;
1255
1256 /* Kernel thread for multiple mount protection */
1257 struct task_struct *s_mmp_tsk;
1258
1259 /* record the last minlen when FITRIM is called. */
1260 atomic_t s_last_trim_minblks;
1261 };
1262
1263 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1264 {
1265 return sb->s_fs_info;
1266 }
1267 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1268 {
1269 return container_of(inode, struct ext4_inode_info, vfs_inode);
1270 }
1271
1272 static inline struct timespec ext4_current_time(struct inode *inode)
1273 {
1274 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1275 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1276 }
1277
1278 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1279 {
1280 return ino == EXT4_ROOT_INO ||
1281 ino == EXT4_JOURNAL_INO ||
1282 ino == EXT4_RESIZE_INO ||
1283 (ino >= EXT4_FIRST_INO(sb) &&
1284 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1285 }
1286
1287 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1288 struct ext4_io_end *io_end)
1289 {
1290 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1291 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1292 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
1293 }
1294 }
1295
1296 /*
1297 * Inode dynamic state flags
1298 */
1299 enum {
1300 EXT4_STATE_JDATA, /* journaled data exists */
1301 EXT4_STATE_NEW, /* inode is newly created */
1302 EXT4_STATE_XATTR, /* has in-inode xattrs */
1303 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1304 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1305 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1306 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1307 EXT4_STATE_NEWENTRY, /* File just added to dir */
1308 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1309 };
1310
1311 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1312 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1313 { \
1314 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1315 } \
1316 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1317 { \
1318 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1319 } \
1320 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1321 { \
1322 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1323 }
1324
1325 EXT4_INODE_BIT_FNS(flag, flags, 0)
1326 #if (BITS_PER_LONG < 64)
1327 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1328
1329 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1330 {
1331 (ei)->i_state_flags = 0;
1332 }
1333 #else
1334 EXT4_INODE_BIT_FNS(state, flags, 32)
1335
1336 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1337 {
1338 /* We depend on the fact that callers will set i_flags */
1339 }
1340 #endif
1341 #else
1342 /* Assume that user mode programs are passing in an ext4fs superblock, not
1343 * a kernel struct super_block. This will allow us to call the feature-test
1344 * macros from user land. */
1345 #define EXT4_SB(sb) (sb)
1346 #endif
1347
1348 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1349
1350 /*
1351 * Codes for operating systems
1352 */
1353 #define EXT4_OS_LINUX 0
1354 #define EXT4_OS_HURD 1
1355 #define EXT4_OS_MASIX 2
1356 #define EXT4_OS_FREEBSD 3
1357 #define EXT4_OS_LITES 4
1358
1359 /*
1360 * Revision levels
1361 */
1362 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1363 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1364
1365 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1366 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1367
1368 #define EXT4_GOOD_OLD_INODE_SIZE 128
1369
1370 /*
1371 * Feature set definitions
1372 */
1373
1374 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1375 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1376 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1377 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1378 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1379 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1380 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1381 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1382 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1383 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1384 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1385 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1386 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1387 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1388 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1389 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1390 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1391 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1392
1393 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1394 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1395 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1396 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1397 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1398 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1399
1400 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1401 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1402 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1403 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1404 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1405 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1406 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1407 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1408 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1409 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1410
1411 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1412 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1413 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1414 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1415 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1416 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1417 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1418 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1419 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1420 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1421 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1422 #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x2000 /* data in inode */
1423 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1424
1425 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1426 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1427 EXT4_FEATURE_INCOMPAT_META_BG)
1428 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1429 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1430 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1431
1432 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1433 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1434 EXT4_FEATURE_INCOMPAT_RECOVER| \
1435 EXT4_FEATURE_INCOMPAT_META_BG)
1436 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1437 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1438 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1439
1440 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1441 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1442 EXT4_FEATURE_INCOMPAT_RECOVER| \
1443 EXT4_FEATURE_INCOMPAT_META_BG| \
1444 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1445 EXT4_FEATURE_INCOMPAT_64BIT| \
1446 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1447 EXT4_FEATURE_INCOMPAT_MMP)
1448 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1449 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1450 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1451 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1452 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1453 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1454 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1455 EXT4_FEATURE_RO_COMPAT_BIGALLOC)
1456
1457 /*
1458 * Default values for user and/or group using reserved blocks
1459 */
1460 #define EXT4_DEF_RESUID 0
1461 #define EXT4_DEF_RESGID 0
1462
1463 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1464
1465 /*
1466 * Default mount options
1467 */
1468 #define EXT4_DEFM_DEBUG 0x0001
1469 #define EXT4_DEFM_BSDGROUPS 0x0002
1470 #define EXT4_DEFM_XATTR_USER 0x0004
1471 #define EXT4_DEFM_ACL 0x0008
1472 #define EXT4_DEFM_UID16 0x0010
1473 #define EXT4_DEFM_JMODE 0x0060
1474 #define EXT4_DEFM_JMODE_DATA 0x0020
1475 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1476 #define EXT4_DEFM_JMODE_WBACK 0x0060
1477 #define EXT4_DEFM_NOBARRIER 0x0100
1478 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1479 #define EXT4_DEFM_DISCARD 0x0400
1480 #define EXT4_DEFM_NODELALLOC 0x0800
1481
1482 /*
1483 * Default journal batch times
1484 */
1485 #define EXT4_DEF_MIN_BATCH_TIME 0
1486 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1487
1488 /*
1489 * Minimum number of groups in a flexgroup before we separate out
1490 * directories into the first block group of a flexgroup
1491 */
1492 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1493
1494 /*
1495 * Structure of a directory entry
1496 */
1497 #define EXT4_NAME_LEN 255
1498
1499 struct ext4_dir_entry {
1500 __le32 inode; /* Inode number */
1501 __le16 rec_len; /* Directory entry length */
1502 __le16 name_len; /* Name length */
1503 char name[EXT4_NAME_LEN]; /* File name */
1504 };
1505
1506 /*
1507 * The new version of the directory entry. Since EXT4 structures are
1508 * stored in intel byte order, and the name_len field could never be
1509 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1510 * file_type field.
1511 */
1512 struct ext4_dir_entry_2 {
1513 __le32 inode; /* Inode number */
1514 __le16 rec_len; /* Directory entry length */
1515 __u8 name_len; /* Name length */
1516 __u8 file_type;
1517 char name[EXT4_NAME_LEN]; /* File name */
1518 };
1519
1520 /*
1521 * Ext4 directory file types. Only the low 3 bits are used. The
1522 * other bits are reserved for now.
1523 */
1524 #define EXT4_FT_UNKNOWN 0
1525 #define EXT4_FT_REG_FILE 1
1526 #define EXT4_FT_DIR 2
1527 #define EXT4_FT_CHRDEV 3
1528 #define EXT4_FT_BLKDEV 4
1529 #define EXT4_FT_FIFO 5
1530 #define EXT4_FT_SOCK 6
1531 #define EXT4_FT_SYMLINK 7
1532
1533 #define EXT4_FT_MAX 8
1534
1535 /*
1536 * EXT4_DIR_PAD defines the directory entries boundaries
1537 *
1538 * NOTE: It must be a multiple of 4
1539 */
1540 #define EXT4_DIR_PAD 4
1541 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1542 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1543 ~EXT4_DIR_ROUND)
1544 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1545
1546 /*
1547 * If we ever get support for fs block sizes > page_size, we'll need
1548 * to remove the #if statements in the next two functions...
1549 */
1550 static inline unsigned int
1551 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1552 {
1553 unsigned len = le16_to_cpu(dlen);
1554
1555 #if (PAGE_CACHE_SIZE >= 65536)
1556 if (len == EXT4_MAX_REC_LEN || len == 0)
1557 return blocksize;
1558 return (len & 65532) | ((len & 3) << 16);
1559 #else
1560 return len;
1561 #endif
1562 }
1563
1564 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1565 {
1566 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1567 BUG();
1568 #if (PAGE_CACHE_SIZE >= 65536)
1569 if (len < 65536)
1570 return cpu_to_le16(len);
1571 if (len == blocksize) {
1572 if (blocksize == 65536)
1573 return cpu_to_le16(EXT4_MAX_REC_LEN);
1574 else
1575 return cpu_to_le16(0);
1576 }
1577 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1578 #else
1579 return cpu_to_le16(len);
1580 #endif
1581 }
1582
1583 /*
1584 * Hash Tree Directory indexing
1585 * (c) Daniel Phillips, 2001
1586 */
1587
1588 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1589 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1590 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1591 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1592 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1593
1594 /* Legal values for the dx_root hash_version field: */
1595
1596 #define DX_HASH_LEGACY 0
1597 #define DX_HASH_HALF_MD4 1
1598 #define DX_HASH_TEA 2
1599 #define DX_HASH_LEGACY_UNSIGNED 3
1600 #define DX_HASH_HALF_MD4_UNSIGNED 4
1601 #define DX_HASH_TEA_UNSIGNED 5
1602
1603 #ifdef __KERNEL__
1604
1605 /* hash info structure used by the directory hash */
1606 struct dx_hash_info
1607 {
1608 u32 hash;
1609 u32 minor_hash;
1610 int hash_version;
1611 u32 *seed;
1612 };
1613
1614 #define EXT4_HTREE_EOF 0x7fffffff
1615
1616 /*
1617 * Control parameters used by ext4_htree_next_block
1618 */
1619 #define HASH_NB_ALWAYS 1
1620
1621
1622 /*
1623 * Describe an inode's exact location on disk and in memory
1624 */
1625 struct ext4_iloc
1626 {
1627 struct buffer_head *bh;
1628 unsigned long offset;
1629 ext4_group_t block_group;
1630 };
1631
1632 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1633 {
1634 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1635 }
1636
1637 /*
1638 * This structure is stuffed into the struct file's private_data field
1639 * for directories. It is where we put information so that we can do
1640 * readdir operations in hash tree order.
1641 */
1642 struct dir_private_info {
1643 struct rb_root root;
1644 struct rb_node *curr_node;
1645 struct fname *extra_fname;
1646 loff_t last_pos;
1647 __u32 curr_hash;
1648 __u32 curr_minor_hash;
1649 __u32 next_hash;
1650 };
1651
1652 /* calculate the first block number of the group */
1653 static inline ext4_fsblk_t
1654 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1655 {
1656 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1657 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1658 }
1659
1660 /*
1661 * Special error return code only used by dx_probe() and its callers.
1662 */
1663 #define ERR_BAD_DX_DIR -75000
1664
1665 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1666 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1667
1668 /*
1669 * Timeout and state flag for lazy initialization inode thread.
1670 */
1671 #define EXT4_DEF_LI_WAIT_MULT 10
1672 #define EXT4_DEF_LI_MAX_START_DELAY 5
1673 #define EXT4_LAZYINIT_QUIT 0x0001
1674 #define EXT4_LAZYINIT_RUNNING 0x0002
1675
1676 /*
1677 * Lazy inode table initialization info
1678 */
1679 struct ext4_lazy_init {
1680 unsigned long li_state;
1681 struct list_head li_request_list;
1682 struct mutex li_list_mtx;
1683 };
1684
1685 struct ext4_li_request {
1686 struct super_block *lr_super;
1687 struct ext4_sb_info *lr_sbi;
1688 ext4_group_t lr_next_group;
1689 struct list_head lr_request;
1690 unsigned long lr_next_sched;
1691 unsigned long lr_timeout;
1692 };
1693
1694 struct ext4_features {
1695 struct kobject f_kobj;
1696 struct completion f_kobj_unregister;
1697 };
1698
1699 /*
1700 * This structure will be used for multiple mount protection. It will be
1701 * written into the block number saved in the s_mmp_block field in the
1702 * superblock. Programs that check MMP should assume that if
1703 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1704 * to use the filesystem, regardless of how old the timestamp is.
1705 */
1706 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1707 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1708 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1709 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1710
1711 struct mmp_struct {
1712 __le32 mmp_magic; /* Magic number for MMP */
1713 __le32 mmp_seq; /* Sequence no. updated periodically */
1714
1715 /*
1716 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1717 * purposes and do not affect the correctness of the algorithm
1718 */
1719 __le64 mmp_time; /* Time last updated */
1720 char mmp_nodename[64]; /* Node which last updated MMP block */
1721 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1722
1723 /*
1724 * mmp_check_interval is used to verify if the MMP block has been
1725 * updated on the block device. The value is updated based on the
1726 * maximum time to write the MMP block during an update cycle.
1727 */
1728 __le16 mmp_check_interval;
1729
1730 __le16 mmp_pad1;
1731 __le32 mmp_pad2[227];
1732 };
1733
1734 /* arguments passed to the mmp thread */
1735 struct mmpd_data {
1736 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1737 struct super_block *sb; /* super block of the fs */
1738 };
1739
1740 /*
1741 * Check interval multiplier
1742 * The MMP block is written every update interval and initially checked every
1743 * update interval x the multiplier (the value is then adapted based on the
1744 * write latency). The reason is that writes can be delayed under load and we
1745 * don't want readers to incorrectly assume that the filesystem is no longer
1746 * in use.
1747 */
1748 #define EXT4_MMP_CHECK_MULT 2UL
1749
1750 /*
1751 * Minimum interval for MMP checking in seconds.
1752 */
1753 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1754
1755 /*
1756 * Maximum interval for MMP checking in seconds.
1757 */
1758 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1759
1760 /*
1761 * Function prototypes
1762 */
1763
1764 /*
1765 * Ok, these declarations are also in <linux/kernel.h> but none of the
1766 * ext4 source programs needs to include it so they are duplicated here.
1767 */
1768 # define NORET_TYPE /**/
1769 # define ATTRIB_NORET __attribute__((noreturn))
1770 # define NORET_AND noreturn,
1771
1772 /* bitmap.c */
1773 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1774
1775 /* balloc.c */
1776 extern unsigned int ext4_block_group(struct super_block *sb,
1777 ext4_fsblk_t blocknr);
1778 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1779 ext4_fsblk_t blocknr);
1780 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1781 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1782 ext4_group_t group);
1783 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1784 ext4_fsblk_t goal,
1785 unsigned int flags,
1786 unsigned long *count,
1787 int *errp);
1788 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1789 s64 nclusters, unsigned int flags);
1790 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1791 extern void ext4_check_blocks_bitmap(struct super_block *);
1792 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1793 ext4_group_t block_group,
1794 struct buffer_head ** bh);
1795 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1796 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1797 ext4_group_t block_group);
1798 extern void ext4_init_block_bitmap(struct super_block *sb,
1799 struct buffer_head *bh,
1800 ext4_group_t group,
1801 struct ext4_group_desc *desc);
1802 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1803 ext4_group_t block_group,
1804 struct ext4_group_desc *gdp);
1805 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1806 ext4_group_t block_group,
1807 struct ext4_group_desc *gdp);
1808 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1809
1810 /* dir.c */
1811 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1812 struct file *,
1813 struct ext4_dir_entry_2 *,
1814 struct buffer_head *, unsigned int);
1815 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1816 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1817 (de), (bh), (offset)))
1818 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1819 __u32 minor_hash,
1820 struct ext4_dir_entry_2 *dirent);
1821 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1822
1823 /* fsync.c */
1824 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1825 extern int ext4_flush_completed_IO(struct inode *);
1826
1827 /* hash.c */
1828 extern int ext4fs_dirhash(const char *name, int len, struct
1829 dx_hash_info *hinfo);
1830
1831 /* ialloc.c */
1832 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
1833 const struct qstr *qstr, __u32 goal,
1834 uid_t *owner);
1835 extern void ext4_free_inode(handle_t *, struct inode *);
1836 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1837 extern unsigned long ext4_count_free_inodes(struct super_block *);
1838 extern unsigned long ext4_count_dirs(struct super_block *);
1839 extern void ext4_check_inodes_bitmap(struct super_block *);
1840 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1841 extern int ext4_init_inode_table(struct super_block *sb,
1842 ext4_group_t group, int barrier);
1843
1844 /* mballoc.c */
1845 extern long ext4_mb_stats;
1846 extern long ext4_mb_max_to_scan;
1847 extern int ext4_mb_init(struct super_block *, int);
1848 extern int ext4_mb_release(struct super_block *);
1849 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1850 struct ext4_allocation_request *, int *);
1851 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1852 extern void ext4_discard_preallocations(struct inode *);
1853 extern int __init ext4_init_mballoc(void);
1854 extern void ext4_exit_mballoc(void);
1855 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1856 struct buffer_head *bh, ext4_fsblk_t block,
1857 unsigned long count, int flags);
1858 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1859 ext4_group_t i, struct ext4_group_desc *desc);
1860 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1861 ext4_fsblk_t block, unsigned long count);
1862 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1863
1864 /* inode.c */
1865 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1866 ext4_lblk_t, int, int *);
1867 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1868 ext4_lblk_t, int, int *);
1869 int ext4_get_block(struct inode *inode, sector_t iblock,
1870 struct buffer_head *bh_result, int create);
1871
1872 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1873 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1874 extern int ext4_setattr(struct dentry *, struct iattr *);
1875 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1876 struct kstat *stat);
1877 extern void ext4_evict_inode(struct inode *);
1878 extern void ext4_clear_inode(struct inode *);
1879 extern int ext4_sync_inode(handle_t *, struct inode *);
1880 extern void ext4_dirty_inode(struct inode *, int);
1881 extern int ext4_change_inode_journal_flag(struct inode *, int);
1882 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1883 extern int ext4_can_truncate(struct inode *inode);
1884 extern void ext4_truncate(struct inode *);
1885 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1886 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1887 extern void ext4_set_inode_flags(struct inode *);
1888 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1889 extern int ext4_alloc_da_blocks(struct inode *inode);
1890 extern void ext4_set_aops(struct inode *inode);
1891 extern int ext4_writepage_trans_blocks(struct inode *);
1892 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1893 extern int ext4_discard_partial_page_buffers(handle_t *handle,
1894 struct address_space *mapping, loff_t from,
1895 loff_t length, int flags);
1896 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1897 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1898 extern void ext4_da_update_reserve_space(struct inode *inode,
1899 int used, int quota_claim);
1900
1901 /* indirect.c */
1902 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1903 struct ext4_map_blocks *map, int flags);
1904 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1905 const struct iovec *iov, loff_t offset,
1906 unsigned long nr_segs);
1907 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1908 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1909 extern void ext4_ind_truncate(struct inode *inode);
1910
1911 /* ioctl.c */
1912 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1913 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1914
1915 /* migrate.c */
1916 extern int ext4_ext_migrate(struct inode *);
1917
1918 /* namei.c */
1919 extern int ext4_orphan_add(handle_t *, struct inode *);
1920 extern int ext4_orphan_del(handle_t *, struct inode *);
1921 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1922 __u32 start_minor_hash, __u32 *next_hash);
1923
1924 /* resize.c */
1925 extern int ext4_group_add(struct super_block *sb,
1926 struct ext4_new_group_data *input);
1927 extern int ext4_group_extend(struct super_block *sb,
1928 struct ext4_super_block *es,
1929 ext4_fsblk_t n_blocks_count);
1930 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
1931
1932 /* super.c */
1933 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1934 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1935 extern void ext4_kvfree(void *ptr);
1936 extern __printf(4, 5)
1937 void __ext4_error(struct super_block *, const char *, unsigned int,
1938 const char *, ...);
1939 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1940 __LINE__, ## message)
1941 extern __printf(5, 6)
1942 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
1943 const char *, ...);
1944 extern __printf(5, 6)
1945 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
1946 const char *, ...);
1947 extern void __ext4_std_error(struct super_block *, const char *,
1948 unsigned int, int);
1949 extern __printf(4, 5)
1950 void __ext4_abort(struct super_block *, const char *, unsigned int,
1951 const char *, ...);
1952 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1953 __LINE__, ## message)
1954 extern __printf(4, 5)
1955 void __ext4_warning(struct super_block *, const char *, unsigned int,
1956 const char *, ...);
1957 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1958 __LINE__, ## message)
1959 extern __printf(3, 4)
1960 void ext4_msg(struct super_block *, const char *, const char *, ...);
1961 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1962 const char *, unsigned int, const char *);
1963 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
1964 __LINE__, msg)
1965 extern __printf(7, 8)
1966 void __ext4_grp_locked_error(const char *, unsigned int,
1967 struct super_block *, ext4_group_t,
1968 unsigned long, ext4_fsblk_t,
1969 const char *, ...);
1970 #define ext4_grp_locked_error(sb, grp, message...) \
1971 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1972 extern void ext4_update_dynamic_rev(struct super_block *sb);
1973 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1974 __u32 compat);
1975 extern int ext4_update_rocompat_feature(handle_t *handle,
1976 struct super_block *sb, __u32 rocompat);
1977 extern int ext4_update_incompat_feature(handle_t *handle,
1978 struct super_block *sb, __u32 incompat);
1979 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1980 struct ext4_group_desc *bg);
1981 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1982 struct ext4_group_desc *bg);
1983 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1984 struct ext4_group_desc *bg);
1985 extern __u32 ext4_free_group_clusters(struct super_block *sb,
1986 struct ext4_group_desc *bg);
1987 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1988 struct ext4_group_desc *bg);
1989 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1990 struct ext4_group_desc *bg);
1991 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1992 struct ext4_group_desc *bg);
1993 extern void ext4_block_bitmap_set(struct super_block *sb,
1994 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1995 extern void ext4_inode_bitmap_set(struct super_block *sb,
1996 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1997 extern void ext4_inode_table_set(struct super_block *sb,
1998 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1999 extern void ext4_free_group_clusters_set(struct super_block *sb,
2000 struct ext4_group_desc *bg,
2001 __u32 count);
2002 extern void ext4_free_inodes_set(struct super_block *sb,
2003 struct ext4_group_desc *bg, __u32 count);
2004 extern void ext4_used_dirs_set(struct super_block *sb,
2005 struct ext4_group_desc *bg, __u32 count);
2006 extern void ext4_itable_unused_set(struct super_block *sb,
2007 struct ext4_group_desc *bg, __u32 count);
2008 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
2009 struct ext4_group_desc *gdp);
2010 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
2011 struct ext4_group_desc *gdp);
2012
2013 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2014 {
2015 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2016 le32_to_cpu(es->s_blocks_count_lo);
2017 }
2018
2019 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2020 {
2021 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2022 le32_to_cpu(es->s_r_blocks_count_lo);
2023 }
2024
2025 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2026 {
2027 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2028 le32_to_cpu(es->s_free_blocks_count_lo);
2029 }
2030
2031 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2032 ext4_fsblk_t blk)
2033 {
2034 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2035 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2036 }
2037
2038 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2039 ext4_fsblk_t blk)
2040 {
2041 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2042 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2043 }
2044
2045 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2046 ext4_fsblk_t blk)
2047 {
2048 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2049 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2050 }
2051
2052 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2053 {
2054 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2055 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2056 le32_to_cpu(raw_inode->i_size_lo);
2057 else
2058 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2059 }
2060
2061 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2062 {
2063 raw_inode->i_size_lo = cpu_to_le32(i_size);
2064 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2065 }
2066
2067 static inline
2068 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2069 ext4_group_t group)
2070 {
2071 struct ext4_group_info ***grp_info;
2072 long indexv, indexh;
2073 grp_info = EXT4_SB(sb)->s_group_info;
2074 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2075 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2076 return grp_info[indexv][indexh];
2077 }
2078
2079 /*
2080 * Reading s_groups_count requires using smp_rmb() afterwards. See
2081 * the locking protocol documented in the comments of ext4_group_add()
2082 * in resize.c
2083 */
2084 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2085 {
2086 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2087
2088 smp_rmb();
2089 return ngroups;
2090 }
2091
2092 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2093 ext4_group_t block_group)
2094 {
2095 return block_group >> sbi->s_log_groups_per_flex;
2096 }
2097
2098 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2099 {
2100 return 1 << sbi->s_log_groups_per_flex;
2101 }
2102
2103 #define ext4_std_error(sb, errno) \
2104 do { \
2105 if ((errno)) \
2106 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2107 } while (0)
2108
2109 #ifdef CONFIG_SMP
2110 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2111 * counters. So we need to make sure we have free clusters more
2112 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2113 */
2114 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2115 #else
2116 #define EXT4_FREECLUSTERS_WATERMARK 0
2117 #endif
2118
2119 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2120 {
2121 /*
2122 * XXX: replace with spinlock if seen contended -bzzz
2123 */
2124 down_write(&EXT4_I(inode)->i_data_sem);
2125 if (newsize > EXT4_I(inode)->i_disksize)
2126 EXT4_I(inode)->i_disksize = newsize;
2127 up_write(&EXT4_I(inode)->i_data_sem);
2128 return ;
2129 }
2130
2131 struct ext4_group_info {
2132 unsigned long bb_state;
2133 struct rb_root bb_free_root;
2134 ext4_grpblk_t bb_first_free; /* first free block */
2135 ext4_grpblk_t bb_free; /* total free blocks */
2136 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2137 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2138 struct list_head bb_prealloc_list;
2139 #ifdef DOUBLE_CHECK
2140 void *bb_bitmap;
2141 #endif
2142 struct rw_semaphore alloc_sem;
2143 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2144 * regions, index is order.
2145 * bb_counters[3] = 5 means
2146 * 5 free 8-block regions. */
2147 };
2148
2149 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2150 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2151
2152 #define EXT4_MB_GRP_NEED_INIT(grp) \
2153 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2154
2155 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2156 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2157 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2158 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2159 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2160 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2161
2162 #define EXT4_MAX_CONTENTION 8
2163 #define EXT4_CONTENTION_THRESHOLD 2
2164
2165 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2166 ext4_group_t group)
2167 {
2168 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2169 }
2170
2171 /*
2172 * Returns true if the filesystem is busy enough that attempts to
2173 * access the block group locks has run into contention.
2174 */
2175 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2176 {
2177 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2178 }
2179
2180 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2181 {
2182 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2183 if (spin_trylock(lock))
2184 /*
2185 * We're able to grab the lock right away, so drop the
2186 * lock contention counter.
2187 */
2188 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2189 else {
2190 /*
2191 * The lock is busy, so bump the contention counter,
2192 * and then wait on the spin lock.
2193 */
2194 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2195 EXT4_MAX_CONTENTION);
2196 spin_lock(lock);
2197 }
2198 }
2199
2200 static inline void ext4_unlock_group(struct super_block *sb,
2201 ext4_group_t group)
2202 {
2203 spin_unlock(ext4_group_lock_ptr(sb, group));
2204 }
2205
2206 static inline void ext4_mark_super_dirty(struct super_block *sb)
2207 {
2208 if (EXT4_SB(sb)->s_journal == NULL)
2209 sb->s_dirt =1;
2210 }
2211
2212 /*
2213 * Block validity checking
2214 */
2215 #define ext4_check_indirect_blockref(inode, bh) \
2216 ext4_check_blockref(__func__, __LINE__, inode, \
2217 (__le32 *)(bh)->b_data, \
2218 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2219
2220 #define ext4_ind_check_inode(inode) \
2221 ext4_check_blockref(__func__, __LINE__, inode, \
2222 EXT4_I(inode)->i_data, \
2223 EXT4_NDIR_BLOCKS)
2224
2225 /*
2226 * Inodes and files operations
2227 */
2228
2229 /* dir.c */
2230 extern const struct file_operations ext4_dir_operations;
2231
2232 /* file.c */
2233 extern const struct inode_operations ext4_file_inode_operations;
2234 extern const struct file_operations ext4_file_operations;
2235 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2236
2237 /* namei.c */
2238 extern const struct inode_operations ext4_dir_inode_operations;
2239 extern const struct inode_operations ext4_special_inode_operations;
2240 extern struct dentry *ext4_get_parent(struct dentry *child);
2241
2242 /* symlink.c */
2243 extern const struct inode_operations ext4_symlink_inode_operations;
2244 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2245
2246 /* block_validity */
2247 extern void ext4_release_system_zone(struct super_block *sb);
2248 extern int ext4_setup_system_zone(struct super_block *sb);
2249 extern int __init ext4_init_system_zone(void);
2250 extern void ext4_exit_system_zone(void);
2251 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2252 ext4_fsblk_t start_blk,
2253 unsigned int count);
2254 extern int ext4_check_blockref(const char *, unsigned int,
2255 struct inode *, __le32 *, unsigned int);
2256
2257 /* extents.c */
2258 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2259 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2260 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2261 int chunk);
2262 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2263 struct ext4_map_blocks *map, int flags);
2264 extern void ext4_ext_truncate(struct inode *);
2265 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2266 loff_t length);
2267 extern void ext4_ext_init(struct super_block *);
2268 extern void ext4_ext_release(struct super_block *);
2269 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2270 loff_t len);
2271 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2272 ssize_t len);
2273 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2274 struct ext4_map_blocks *map, int flags);
2275 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2276 __u64 start, __u64 len);
2277 /* move_extent.c */
2278 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2279 __u64 start_orig, __u64 start_donor,
2280 __u64 len, __u64 *moved_len);
2281
2282 /* page-io.c */
2283 extern int __init ext4_init_pageio(void);
2284 extern void ext4_exit_pageio(void);
2285 extern void ext4_ioend_wait(struct inode *);
2286 extern void ext4_free_io_end(ext4_io_end_t *io);
2287 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2288 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2289 extern void ext4_io_submit(struct ext4_io_submit *io);
2290 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2291 struct page *page,
2292 int len,
2293 struct writeback_control *wbc);
2294
2295 /* mmp.c */
2296 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2297
2298 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2299 enum ext4_state_bits {
2300 BH_Uninit /* blocks are allocated but uninitialized on disk */
2301 = BH_JBDPrivateStart,
2302 BH_AllocFromCluster, /* allocated blocks were part of already
2303 * allocated cluster. Note that this flag will
2304 * never, ever appear in a buffer_head's state
2305 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2306 * this is used. */
2307 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This
2308 * flag is set when ext4_map_blocks is called on a
2309 * delayed allocated block to get its real mapping. */
2310 };
2311
2312 BUFFER_FNS(Uninit, uninit)
2313 TAS_BUFFER_FNS(Uninit, uninit)
2314 BUFFER_FNS(Da_Mapped, da_mapped)
2315
2316 /*
2317 * Add new method to test wether block and inode bitmaps are properly
2318 * initialized. With uninit_bg reading the block from disk is not enough
2319 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2320 */
2321 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2322
2323 static inline int bitmap_uptodate(struct buffer_head *bh)
2324 {
2325 return (buffer_uptodate(bh) &&
2326 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2327 }
2328 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2329 {
2330 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2331 }
2332
2333 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2334
2335 /* For ioend & aio unwritten conversion wait queues */
2336 #define EXT4_WQ_HASH_SZ 37
2337 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2338 EXT4_WQ_HASH_SZ])
2339 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2340 EXT4_WQ_HASH_SZ])
2341 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2342 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2343
2344 #define EXT4_RESIZING 0
2345 extern int ext4_resize_begin(struct super_block *sb);
2346 extern void ext4_resize_end(struct super_block *sb);
2347
2348 #endif /* __KERNEL__ */
2349
2350 #include "ext4_extents.h"
2351
2352 #endif /* _EXT4_H */