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[mirror_ubuntu-bionic-kernel.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 #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
188 struct ext4_io_page {
189 struct page *p_page;
190 atomic_t p_count;
191 };
192
193 #define MAX_IO_PAGES 128
194
195 typedef struct ext4_io_end {
196 struct list_head list; /* per-file finished IO list */
197 struct inode *inode; /* file being written to */
198 unsigned int flag; /* unwritten or not */
199 struct page *page; /* page struct for buffer write */
200 loff_t offset; /* offset in the file */
201 ssize_t size; /* size of the extent */
202 struct work_struct work; /* data work queue */
203 struct kiocb *iocb; /* iocb struct for AIO */
204 int result; /* error value for AIO */
205 int num_io_pages;
206 struct ext4_io_page *pages[MAX_IO_PAGES];
207 } ext4_io_end_t;
208
209 struct ext4_io_submit {
210 int io_op;
211 struct bio *io_bio;
212 ext4_io_end_t *io_end;
213 struct ext4_io_page *io_page;
214 sector_t io_next_block;
215 };
216
217 /*
218 * Special inodes numbers
219 */
220 #define EXT4_BAD_INO 1 /* Bad blocks inode */
221 #define EXT4_ROOT_INO 2 /* Root inode */
222 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
223 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
224 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
225 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
226 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
227 #define EXT4_JOURNAL_INO 8 /* Journal inode */
228
229 /* First non-reserved inode for old ext4 filesystems */
230 #define EXT4_GOOD_OLD_FIRST_INO 11
231
232 /*
233 * Maximal count of links to a file
234 */
235 #define EXT4_LINK_MAX 65000
236
237 /*
238 * Macro-instructions used to manage several block sizes
239 */
240 #define EXT4_MIN_BLOCK_SIZE 1024
241 #define EXT4_MAX_BLOCK_SIZE 65536
242 #define EXT4_MIN_BLOCK_LOG_SIZE 10
243 #define EXT4_MAX_BLOCK_LOG_SIZE 16
244 #ifdef __KERNEL__
245 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
246 #else
247 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
248 #endif
249 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
250 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
251 EXT4_SB(s)->s_cluster_bits)
252 #ifdef __KERNEL__
253 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
254 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
255 #else
256 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
257 #endif
258 #ifdef __KERNEL__
259 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
260 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
261 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
262 #else
263 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
264 EXT4_GOOD_OLD_INODE_SIZE : \
265 (s)->s_inode_size)
266 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
267 EXT4_GOOD_OLD_FIRST_INO : \
268 (s)->s_first_ino)
269 #endif
270 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
271
272 /* Translate a block number to a cluster number */
273 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
274 /* Translate a cluster number to a block number */
275 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
276 /* Translate # of blks to # of clusters */
277 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
278 (sbi)->s_cluster_bits)
279
280 /*
281 * Structure of a blocks group descriptor
282 */
283 struct ext4_group_desc
284 {
285 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
286 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
287 __le32 bg_inode_table_lo; /* Inodes table block */
288 __le16 bg_free_blocks_count_lo;/* Free blocks count */
289 __le16 bg_free_inodes_count_lo;/* Free inodes count */
290 __le16 bg_used_dirs_count_lo; /* Directories count */
291 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
292 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
293 __le16 bg_itable_unused_lo; /* Unused inodes count */
294 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
295 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
296 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
297 __le32 bg_inode_table_hi; /* Inodes table block MSB */
298 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
299 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
300 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
301 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
302 __u32 bg_reserved2[3];
303 };
304
305 /*
306 * Structure of a flex block group info
307 */
308
309 struct flex_groups {
310 atomic_t free_inodes;
311 atomic_t free_clusters;
312 atomic_t used_dirs;
313 };
314
315 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
316 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
317 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
318
319 /*
320 * Macro-instructions used to manage group descriptors
321 */
322 #define EXT4_MIN_DESC_SIZE 32
323 #define EXT4_MIN_DESC_SIZE_64BIT 64
324 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
325 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
326 #ifdef __KERNEL__
327 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
328 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
329 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
330 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
331 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
332 #else
333 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
335 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
336 #endif
337
338 /*
339 * Constants relative to the data blocks
340 */
341 #define EXT4_NDIR_BLOCKS 12
342 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
343 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
344 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
345 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
346
347 /*
348 * Inode flags
349 */
350 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
351 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
352 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
353 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
354 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
355 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
356 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
357 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
358 /* Reserved for compression usage... */
359 #define EXT4_DIRTY_FL 0x00000100
360 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
361 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
362 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
363 /* End compression flags --- maybe not all used */
364 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
365 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
366 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
367 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
368 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
369 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
370 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
371 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
372 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
373 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
374 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
375
376 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
377 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
378
379 /* Flags that should be inherited by new inodes from their parent. */
380 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
381 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
382 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
383 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
384
385 /* Flags that are appropriate for regular files (all but dir-specific ones). */
386 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
387
388 /* Flags that are appropriate for non-directories/regular files. */
389 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
390
391 /* Mask out flags that are inappropriate for the given type of inode. */
392 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
393 {
394 if (S_ISDIR(mode))
395 return flags;
396 else if (S_ISREG(mode))
397 return flags & EXT4_REG_FLMASK;
398 else
399 return flags & EXT4_OTHER_FLMASK;
400 }
401
402 /*
403 * Inode flags used for atomic set/get
404 */
405 enum {
406 EXT4_INODE_SECRM = 0, /* Secure deletion */
407 EXT4_INODE_UNRM = 1, /* Undelete */
408 EXT4_INODE_COMPR = 2, /* Compress file */
409 EXT4_INODE_SYNC = 3, /* Synchronous updates */
410 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
411 EXT4_INODE_APPEND = 5, /* writes to file may only append */
412 EXT4_INODE_NODUMP = 6, /* do not dump file */
413 EXT4_INODE_NOATIME = 7, /* do not update atime */
414 /* Reserved for compression usage... */
415 EXT4_INODE_DIRTY = 8,
416 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
417 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
418 EXT4_INODE_ECOMPR = 11, /* Compression error */
419 /* End compression flags --- maybe not all used */
420 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
421 EXT4_INODE_IMAGIC = 13, /* AFS directory */
422 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
423 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
424 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
425 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
426 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
427 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
428 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
429 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
430 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
431 };
432
433 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
434 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
435 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
436 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
437
438 /*
439 * Since it's pretty easy to mix up bit numbers and hex values, and we
440 * can't do a compile-time test for ENUM values, we use a run-time
441 * test to make sure that EXT4_XXX_FL is consistent with respect to
442 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
443 * out so it won't cost any extra space in the compiled kernel image.
444 * But it's important that these values are the same, since we are
445 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
446 * must be consistent with the values of FS_XXX_FL defined in
447 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
448 * ext4 filesystems, and of course the values defined in e2fsprogs.
449 *
450 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
451 */
452 static inline void ext4_check_flag_values(void)
453 {
454 CHECK_FLAG_VALUE(SECRM);
455 CHECK_FLAG_VALUE(UNRM);
456 CHECK_FLAG_VALUE(COMPR);
457 CHECK_FLAG_VALUE(SYNC);
458 CHECK_FLAG_VALUE(IMMUTABLE);
459 CHECK_FLAG_VALUE(APPEND);
460 CHECK_FLAG_VALUE(NODUMP);
461 CHECK_FLAG_VALUE(NOATIME);
462 CHECK_FLAG_VALUE(DIRTY);
463 CHECK_FLAG_VALUE(COMPRBLK);
464 CHECK_FLAG_VALUE(NOCOMPR);
465 CHECK_FLAG_VALUE(ECOMPR);
466 CHECK_FLAG_VALUE(INDEX);
467 CHECK_FLAG_VALUE(IMAGIC);
468 CHECK_FLAG_VALUE(JOURNAL_DATA);
469 CHECK_FLAG_VALUE(NOTAIL);
470 CHECK_FLAG_VALUE(DIRSYNC);
471 CHECK_FLAG_VALUE(TOPDIR);
472 CHECK_FLAG_VALUE(HUGE_FILE);
473 CHECK_FLAG_VALUE(EXTENTS);
474 CHECK_FLAG_VALUE(EA_INODE);
475 CHECK_FLAG_VALUE(EOFBLOCKS);
476 CHECK_FLAG_VALUE(RESERVED);
477 }
478
479 /* Used to pass group descriptor data when online resize is done */
480 struct ext4_new_group_input {
481 __u32 group; /* Group number for this data */
482 __u64 block_bitmap; /* Absolute block number of block bitmap */
483 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
484 __u64 inode_table; /* Absolute block number of inode table start */
485 __u32 blocks_count; /* Total number of blocks in this group */
486 __u16 reserved_blocks; /* Number of reserved blocks in this group */
487 __u16 unused;
488 };
489
490 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
491 struct compat_ext4_new_group_input {
492 u32 group;
493 compat_u64 block_bitmap;
494 compat_u64 inode_bitmap;
495 compat_u64 inode_table;
496 u32 blocks_count;
497 u16 reserved_blocks;
498 u16 unused;
499 };
500 #endif
501
502 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
503 struct ext4_new_group_data {
504 __u32 group;
505 __u64 block_bitmap;
506 __u64 inode_bitmap;
507 __u64 inode_table;
508 __u32 blocks_count;
509 __u16 reserved_blocks;
510 __u16 unused;
511 __u32 free_blocks_count;
512 };
513
514 /* Indexes used to index group tables in ext4_new_group_data */
515 enum {
516 BLOCK_BITMAP = 0, /* block bitmap */
517 INODE_BITMAP, /* inode bitmap */
518 INODE_TABLE, /* inode tables */
519 GROUP_TABLE_COUNT,
520 };
521
522 /*
523 * Flags used by ext4_map_blocks()
524 */
525 /* Allocate any needed blocks and/or convert an unitialized
526 extent to be an initialized ext4 */
527 #define EXT4_GET_BLOCKS_CREATE 0x0001
528 /* Request the creation of an unitialized extent */
529 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
530 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
531 EXT4_GET_BLOCKS_CREATE)
532 /* Caller is from the delayed allocation writeout path,
533 so set the magic i_delalloc_reserve_flag after taking the
534 inode allocation semaphore for */
535 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
536 /* caller is from the direct IO path, request to creation of an
537 unitialized extents if not allocated, split the uninitialized
538 extent if blocks has been preallocated already*/
539 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
540 #define EXT4_GET_BLOCKS_CONVERT 0x0010
541 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
542 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
543 /* Convert extent to initialized after IO complete */
544 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
545 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
546 /* Punch out blocks of an extent */
547 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
548 /* Don't normalize allocation size (used for fallocate) */
549 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
550 /* Request will not result in inode size update (user for fallocate) */
551 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
552
553 /*
554 * Flags used by ext4_free_blocks
555 */
556 #define EXT4_FREE_BLOCKS_METADATA 0x0001
557 #define EXT4_FREE_BLOCKS_FORGET 0x0002
558 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
559 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
560 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
561 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
562
563 /*
564 * Flags used by ext4_discard_partial_page_buffers
565 */
566 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
567
568 /*
569 * ioctl commands
570 */
571 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
572 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
573 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
574 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
575 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
576 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
577 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
578 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
579 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
580 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
581 #define EXT4_IOC_MIGRATE _IO('f', 9)
582 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
583 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
584 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
585 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
586 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
587
588 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
589 /*
590 * ioctl commands in 32 bit emulation
591 */
592 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
593 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
594 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
595 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
596 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
597 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
598 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
599 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
600 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
601 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
602 #endif
603
604 /* Max physical block we can address w/o extents */
605 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
606
607 /*
608 * Structure of an inode on the disk
609 */
610 struct ext4_inode {
611 __le16 i_mode; /* File mode */
612 __le16 i_uid; /* Low 16 bits of Owner Uid */
613 __le32 i_size_lo; /* Size in bytes */
614 __le32 i_atime; /* Access time */
615 __le32 i_ctime; /* Inode Change time */
616 __le32 i_mtime; /* Modification time */
617 __le32 i_dtime; /* Deletion Time */
618 __le16 i_gid; /* Low 16 bits of Group Id */
619 __le16 i_links_count; /* Links count */
620 __le32 i_blocks_lo; /* Blocks count */
621 __le32 i_flags; /* File flags */
622 union {
623 struct {
624 __le32 l_i_version;
625 } linux1;
626 struct {
627 __u32 h_i_translator;
628 } hurd1;
629 struct {
630 __u32 m_i_reserved1;
631 } masix1;
632 } osd1; /* OS dependent 1 */
633 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
634 __le32 i_generation; /* File version (for NFS) */
635 __le32 i_file_acl_lo; /* File ACL */
636 __le32 i_size_high;
637 __le32 i_obso_faddr; /* Obsoleted fragment address */
638 union {
639 struct {
640 __le16 l_i_blocks_high; /* were l_i_reserved1 */
641 __le16 l_i_file_acl_high;
642 __le16 l_i_uid_high; /* these 2 fields */
643 __le16 l_i_gid_high; /* were reserved2[0] */
644 __u32 l_i_reserved2;
645 } linux2;
646 struct {
647 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
648 __u16 h_i_mode_high;
649 __u16 h_i_uid_high;
650 __u16 h_i_gid_high;
651 __u32 h_i_author;
652 } hurd2;
653 struct {
654 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
655 __le16 m_i_file_acl_high;
656 __u32 m_i_reserved2[2];
657 } masix2;
658 } osd2; /* OS dependent 2 */
659 __le16 i_extra_isize;
660 __le16 i_pad1;
661 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
662 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
663 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
664 __le32 i_crtime; /* File Creation time */
665 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
666 __le32 i_version_hi; /* high 32 bits for 64-bit version */
667 };
668
669 struct move_extent {
670 __u32 reserved; /* should be zero */
671 __u32 donor_fd; /* donor file descriptor */
672 __u64 orig_start; /* logical start offset in block for orig */
673 __u64 donor_start; /* logical start offset in block for donor */
674 __u64 len; /* block length to be moved */
675 __u64 moved_len; /* moved block length */
676 };
677
678 #define EXT4_EPOCH_BITS 2
679 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
680 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
681
682 /*
683 * Extended fields will fit into an inode if the filesystem was formatted
684 * with large inodes (-I 256 or larger) and there are not currently any EAs
685 * consuming all of the available space. For new inodes we always reserve
686 * enough space for the kernel's known extended fields, but for inodes
687 * created with an old kernel this might not have been the case. None of
688 * the extended inode fields is critical for correct filesystem operation.
689 * This macro checks if a certain field fits in the inode. Note that
690 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
691 */
692 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
693 ((offsetof(typeof(*ext4_inode), field) + \
694 sizeof((ext4_inode)->field)) \
695 <= (EXT4_GOOD_OLD_INODE_SIZE + \
696 (einode)->i_extra_isize)) \
697
698 static inline __le32 ext4_encode_extra_time(struct timespec *time)
699 {
700 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
701 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
702 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
703 }
704
705 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
706 {
707 if (sizeof(time->tv_sec) > 4)
708 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
709 << 32;
710 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
711 }
712
713 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
714 do { \
715 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
716 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
717 (raw_inode)->xtime ## _extra = \
718 ext4_encode_extra_time(&(inode)->xtime); \
719 } while (0)
720
721 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
722 do { \
723 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
724 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
725 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
726 (raw_inode)->xtime ## _extra = \
727 ext4_encode_extra_time(&(einode)->xtime); \
728 } while (0)
729
730 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
731 do { \
732 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
733 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
734 ext4_decode_extra_time(&(inode)->xtime, \
735 raw_inode->xtime ## _extra); \
736 else \
737 (inode)->xtime.tv_nsec = 0; \
738 } while (0)
739
740 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
741 do { \
742 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
743 (einode)->xtime.tv_sec = \
744 (signed)le32_to_cpu((raw_inode)->xtime); \
745 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
746 ext4_decode_extra_time(&(einode)->xtime, \
747 raw_inode->xtime ## _extra); \
748 else \
749 (einode)->xtime.tv_nsec = 0; \
750 } while (0)
751
752 #define i_disk_version osd1.linux1.l_i_version
753
754 #if defined(__KERNEL__) || defined(__linux__)
755 #define i_reserved1 osd1.linux1.l_i_reserved1
756 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
757 #define i_blocks_high osd2.linux2.l_i_blocks_high
758 #define i_uid_low i_uid
759 #define i_gid_low i_gid
760 #define i_uid_high osd2.linux2.l_i_uid_high
761 #define i_gid_high osd2.linux2.l_i_gid_high
762 #define i_reserved2 osd2.linux2.l_i_reserved2
763
764 #elif defined(__GNU__)
765
766 #define i_translator osd1.hurd1.h_i_translator
767 #define i_uid_high osd2.hurd2.h_i_uid_high
768 #define i_gid_high osd2.hurd2.h_i_gid_high
769 #define i_author osd2.hurd2.h_i_author
770
771 #elif defined(__masix__)
772
773 #define i_reserved1 osd1.masix1.m_i_reserved1
774 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
775 #define i_reserved2 osd2.masix2.m_i_reserved2
776
777 #endif /* defined(__KERNEL__) || defined(__linux__) */
778
779 /*
780 * storage for cached extent
781 * If ec_len == 0, then the cache is invalid.
782 * If ec_start == 0, then the cache represents a gap (null mapping)
783 */
784 struct ext4_ext_cache {
785 ext4_fsblk_t ec_start;
786 ext4_lblk_t ec_block;
787 __u32 ec_len; /* must be 32bit to return holes */
788 };
789
790 /*
791 * fourth extended file system inode data in memory
792 */
793 struct ext4_inode_info {
794 __le32 i_data[15]; /* unconverted */
795 __u32 i_dtime;
796 ext4_fsblk_t i_file_acl;
797
798 /*
799 * i_block_group is the number of the block group which contains
800 * this file's inode. Constant across the lifetime of the inode,
801 * it is ued for making block allocation decisions - we try to
802 * place a file's data blocks near its inode block, and new inodes
803 * near to their parent directory's inode.
804 */
805 ext4_group_t i_block_group;
806 ext4_lblk_t i_dir_start_lookup;
807 #if (BITS_PER_LONG < 64)
808 unsigned long i_state_flags; /* Dynamic state flags */
809 #endif
810 unsigned long i_flags;
811
812 #ifdef CONFIG_EXT4_FS_XATTR
813 /*
814 * Extended attributes can be read independently of the main file
815 * data. Taking i_mutex even when reading would cause contention
816 * between readers of EAs and writers of regular file data, so
817 * instead we synchronize on xattr_sem when reading or changing
818 * EAs.
819 */
820 struct rw_semaphore xattr_sem;
821 #endif
822
823 struct list_head i_orphan; /* unlinked but open inodes */
824
825 /*
826 * i_disksize keeps track of what the inode size is ON DISK, not
827 * in memory. During truncate, i_size is set to the new size by
828 * the VFS prior to calling ext4_truncate(), but the filesystem won't
829 * set i_disksize to 0 until the truncate is actually under way.
830 *
831 * The intent is that i_disksize always represents the blocks which
832 * are used by this file. This allows recovery to restart truncate
833 * on orphans if we crash during truncate. We actually write i_disksize
834 * into the on-disk inode when writing inodes out, instead of i_size.
835 *
836 * The only time when i_disksize and i_size may be different is when
837 * a truncate is in progress. The only things which change i_disksize
838 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
839 */
840 loff_t i_disksize;
841
842 /*
843 * i_data_sem is for serialising ext4_truncate() against
844 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
845 * data tree are chopped off during truncate. We can't do that in
846 * ext4 because whenever we perform intermediate commits during
847 * truncate, the inode and all the metadata blocks *must* be in a
848 * consistent state which allows truncation of the orphans to restart
849 * during recovery. Hence we must fix the get_block-vs-truncate race
850 * by other means, so we have i_data_sem.
851 */
852 struct rw_semaphore i_data_sem;
853 struct inode vfs_inode;
854 struct jbd2_inode *jinode;
855
856 struct ext4_ext_cache i_cached_extent;
857 /*
858 * File creation time. Its function is same as that of
859 * struct timespec i_{a,c,m}time in the generic inode.
860 */
861 struct timespec i_crtime;
862
863 /* mballoc */
864 struct list_head i_prealloc_list;
865 spinlock_t i_prealloc_lock;
866
867 /* ialloc */
868 ext4_group_t i_last_alloc_group;
869
870 /* allocation reservation info for delalloc */
871 /* In case of bigalloc, these refer to clusters rather than blocks */
872 unsigned int i_reserved_data_blocks;
873 unsigned int i_reserved_meta_blocks;
874 unsigned int i_allocated_meta_blocks;
875 ext4_lblk_t i_da_metadata_calc_last_lblock;
876 int i_da_metadata_calc_len;
877
878 /* on-disk additional length */
879 __u16 i_extra_isize;
880
881 #ifdef CONFIG_QUOTA
882 /* quota space reservation, managed internally by quota code */
883 qsize_t i_reserved_quota;
884 #endif
885
886 /* completed IOs that might need unwritten extents handling */
887 struct list_head i_completed_io_list;
888 spinlock_t i_completed_io_lock;
889 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
890 /* current io_end structure for async DIO write*/
891 ext4_io_end_t *cur_aio_dio;
892 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
893
894 spinlock_t i_block_reservation_lock;
895
896 /*
897 * Transactions that contain inode's metadata needed to complete
898 * fsync and fdatasync, respectively.
899 */
900 tid_t i_sync_tid;
901 tid_t i_datasync_tid;
902 };
903
904 /*
905 * File system states
906 */
907 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
908 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
909 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
910
911 /*
912 * Misc. filesystem flags
913 */
914 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
915 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
916 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
917
918 /*
919 * Mount flags
920 */
921 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
922 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
923 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
924 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
925 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
926 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
927 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
928 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
929 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
930 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
931 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
932 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
933 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
934 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
935 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
936 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
937 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
938 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
939 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
940 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
941 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
942 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
943 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
944 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
945 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
946 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
947 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
948 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
949 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
950 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
951
952 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
953 specified delalloc */
954
955 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
956 ~EXT4_MOUNT_##opt
957 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
958 EXT4_MOUNT_##opt
959 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
960 EXT4_MOUNT_##opt)
961
962 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
963 ~EXT4_MOUNT2_##opt
964 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
965 EXT4_MOUNT2_##opt
966 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
967 EXT4_MOUNT2_##opt)
968
969 #define ext4_test_and_set_bit __test_and_set_bit_le
970 #define ext4_set_bit __set_bit_le
971 #define ext4_set_bit_atomic ext2_set_bit_atomic
972 #define ext4_test_and_clear_bit __test_and_clear_bit_le
973 #define ext4_clear_bit __clear_bit_le
974 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
975 #define ext4_test_bit test_bit_le
976 #define ext4_find_next_zero_bit find_next_zero_bit_le
977 #define ext4_find_next_bit find_next_bit_le
978
979 extern void ext4_set_bits(void *bm, int cur, int len);
980
981 /*
982 * Maximal mount counts between two filesystem checks
983 */
984 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
985 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
986
987 /*
988 * Behaviour when detecting errors
989 */
990 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
991 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
992 #define EXT4_ERRORS_PANIC 3 /* Panic */
993 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
994
995 /*
996 * Structure of the super block
997 */
998 struct ext4_super_block {
999 /*00*/ __le32 s_inodes_count; /* Inodes count */
1000 __le32 s_blocks_count_lo; /* Blocks count */
1001 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1002 __le32 s_free_blocks_count_lo; /* Free blocks count */
1003 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1004 __le32 s_first_data_block; /* First Data Block */
1005 __le32 s_log_block_size; /* Block size */
1006 __le32 s_log_cluster_size; /* Allocation cluster size */
1007 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1008 __le32 s_clusters_per_group; /* # Clusters per group */
1009 __le32 s_inodes_per_group; /* # Inodes per group */
1010 __le32 s_mtime; /* Mount time */
1011 /*30*/ __le32 s_wtime; /* Write time */
1012 __le16 s_mnt_count; /* Mount count */
1013 __le16 s_max_mnt_count; /* Maximal mount count */
1014 __le16 s_magic; /* Magic signature */
1015 __le16 s_state; /* File system state */
1016 __le16 s_errors; /* Behaviour when detecting errors */
1017 __le16 s_minor_rev_level; /* minor revision level */
1018 /*40*/ __le32 s_lastcheck; /* time of last check */
1019 __le32 s_checkinterval; /* max. time between checks */
1020 __le32 s_creator_os; /* OS */
1021 __le32 s_rev_level; /* Revision level */
1022 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1023 __le16 s_def_resgid; /* Default gid for reserved blocks */
1024 /*
1025 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1026 *
1027 * Note: the difference between the compatible feature set and
1028 * the incompatible feature set is that if there is a bit set
1029 * in the incompatible feature set that the kernel doesn't
1030 * know about, it should refuse to mount the filesystem.
1031 *
1032 * e2fsck's requirements are more strict; if it doesn't know
1033 * about a feature in either the compatible or incompatible
1034 * feature set, it must abort and not try to meddle with
1035 * things it doesn't understand...
1036 */
1037 __le32 s_first_ino; /* First non-reserved inode */
1038 __le16 s_inode_size; /* size of inode structure */
1039 __le16 s_block_group_nr; /* block group # of this superblock */
1040 __le32 s_feature_compat; /* compatible feature set */
1041 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1042 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1043 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1044 /*78*/ char s_volume_name[16]; /* volume name */
1045 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1046 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1047 /*
1048 * Performance hints. Directory preallocation should only
1049 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1050 */
1051 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1052 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1053 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1054 /*
1055 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1056 */
1057 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1058 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1059 __le32 s_journal_dev; /* device number of journal file */
1060 __le32 s_last_orphan; /* start of list of inodes to delete */
1061 __le32 s_hash_seed[4]; /* HTREE hash seed */
1062 __u8 s_def_hash_version; /* Default hash version to use */
1063 __u8 s_jnl_backup_type;
1064 __le16 s_desc_size; /* size of group descriptor */
1065 /*100*/ __le32 s_default_mount_opts;
1066 __le32 s_first_meta_bg; /* First metablock block group */
1067 __le32 s_mkfs_time; /* When the filesystem was created */
1068 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1069 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1070 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1071 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1072 __le32 s_free_blocks_count_hi; /* Free blocks count */
1073 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1074 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1075 __le32 s_flags; /* Miscellaneous flags */
1076 __le16 s_raid_stride; /* RAID stride */
1077 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1078 __le64 s_mmp_block; /* Block for multi-mount protection */
1079 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1080 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1081 __u8 s_reserved_char_pad;
1082 __le16 s_reserved_pad;
1083 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1084 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1085 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1086 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1087 snapshot's future use */
1088 __le32 s_snapshot_list; /* inode number of the head of the
1089 on-disk snapshot list */
1090 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1091 __le32 s_error_count; /* number of fs errors */
1092 __le32 s_first_error_time; /* first time an error happened */
1093 __le32 s_first_error_ino; /* inode involved in first error */
1094 __le64 s_first_error_block; /* block involved of first error */
1095 __u8 s_first_error_func[32]; /* function where the error happened */
1096 __le32 s_first_error_line; /* line number where error happened */
1097 __le32 s_last_error_time; /* most recent time of an error */
1098 __le32 s_last_error_ino; /* inode involved in last error */
1099 __le32 s_last_error_line; /* line number where error happened */
1100 __le64 s_last_error_block; /* block involved of last error */
1101 __u8 s_last_error_func[32]; /* function where the error happened */
1102 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1103 __u8 s_mount_opts[64];
1104 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1105 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1106 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1107 __le32 s_reserved[109]; /* Padding to the end of the block */
1108 };
1109
1110 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1111
1112 #ifdef __KERNEL__
1113
1114 /*
1115 * run-time mount flags
1116 */
1117 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1118 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1119
1120 /*
1121 * fourth extended-fs super-block data in memory
1122 */
1123 struct ext4_sb_info {
1124 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1125 unsigned long s_inodes_per_block;/* Number of inodes per block */
1126 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1127 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1128 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1129 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1130 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1131 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1132 ext4_group_t s_groups_count; /* Number of groups in the fs */
1133 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1134 unsigned long s_overhead_last; /* Last calculated overhead */
1135 unsigned long s_blocks_last; /* Last seen block count */
1136 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1137 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1138 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1139 struct buffer_head * s_sbh; /* Buffer containing the super block */
1140 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1141 struct buffer_head **s_group_desc;
1142 unsigned int s_mount_opt;
1143 unsigned int s_mount_opt2;
1144 unsigned int s_mount_flags;
1145 ext4_fsblk_t s_sb_block;
1146 uid_t s_resuid;
1147 gid_t s_resgid;
1148 unsigned short s_mount_state;
1149 unsigned short s_pad;
1150 int s_addr_per_block_bits;
1151 int s_desc_per_block_bits;
1152 int s_inode_size;
1153 int s_first_ino;
1154 unsigned int s_inode_readahead_blks;
1155 unsigned int s_inode_goal;
1156 spinlock_t s_next_gen_lock;
1157 u32 s_next_generation;
1158 u32 s_hash_seed[4];
1159 int s_def_hash_version;
1160 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1161 struct percpu_counter s_freeclusters_counter;
1162 struct percpu_counter s_freeinodes_counter;
1163 struct percpu_counter s_dirs_counter;
1164 struct percpu_counter s_dirtyclusters_counter;
1165 struct blockgroup_lock *s_blockgroup_lock;
1166 struct proc_dir_entry *s_proc;
1167 struct kobject s_kobj;
1168 struct completion s_kobj_unregister;
1169
1170 /* Journaling */
1171 struct journal_s *s_journal;
1172 struct list_head s_orphan;
1173 struct mutex s_orphan_lock;
1174 unsigned long s_resize_flags; /* Flags indicating if there
1175 is a resizer */
1176 unsigned long s_commit_interval;
1177 u32 s_max_batch_time;
1178 u32 s_min_batch_time;
1179 struct block_device *journal_bdev;
1180 #ifdef CONFIG_QUOTA
1181 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1182 int s_jquota_fmt; /* Format of quota to use */
1183 #endif
1184 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1185 struct rb_root system_blks;
1186
1187 #ifdef EXTENTS_STATS
1188 /* ext4 extents stats */
1189 unsigned long s_ext_min;
1190 unsigned long s_ext_max;
1191 unsigned long s_depth_max;
1192 spinlock_t s_ext_stats_lock;
1193 unsigned long s_ext_blocks;
1194 unsigned long s_ext_extents;
1195 #endif
1196 /* ext4 extent cache stats */
1197 unsigned long extent_cache_hits;
1198 unsigned long extent_cache_misses;
1199
1200 /* for buddy allocator */
1201 struct ext4_group_info ***s_group_info;
1202 struct inode *s_buddy_cache;
1203 spinlock_t s_md_lock;
1204 unsigned short *s_mb_offsets;
1205 unsigned int *s_mb_maxs;
1206
1207 /* tunables */
1208 unsigned long s_stripe;
1209 unsigned int s_mb_stream_request;
1210 unsigned int s_mb_max_to_scan;
1211 unsigned int s_mb_min_to_scan;
1212 unsigned int s_mb_stats;
1213 unsigned int s_mb_order2_reqs;
1214 unsigned int s_mb_group_prealloc;
1215 unsigned int s_max_writeback_mb_bump;
1216 /* where last allocation was done - for stream allocation */
1217 unsigned long s_mb_last_group;
1218 unsigned long s_mb_last_start;
1219
1220 /* stats for buddy allocator */
1221 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1222 atomic_t s_bal_success; /* we found long enough chunks */
1223 atomic_t s_bal_allocated; /* in blocks */
1224 atomic_t s_bal_ex_scanned; /* total extents scanned */
1225 atomic_t s_bal_goals; /* goal hits */
1226 atomic_t s_bal_breaks; /* too long searches */
1227 atomic_t s_bal_2orders; /* 2^order hits */
1228 spinlock_t s_bal_lock;
1229 unsigned long s_mb_buddies_generated;
1230 unsigned long long s_mb_generation_time;
1231 atomic_t s_mb_lost_chunks;
1232 atomic_t s_mb_preallocated;
1233 atomic_t s_mb_discarded;
1234 atomic_t s_lock_busy;
1235
1236 /* locality groups */
1237 struct ext4_locality_group __percpu *s_locality_groups;
1238
1239 /* for write statistics */
1240 unsigned long s_sectors_written_start;
1241 u64 s_kbytes_written;
1242
1243 unsigned int s_log_groups_per_flex;
1244 struct flex_groups *s_flex_groups;
1245
1246 /* workqueue for dio unwritten */
1247 struct workqueue_struct *dio_unwritten_wq;
1248
1249 /* timer for periodic error stats printing */
1250 struct timer_list s_err_report;
1251
1252 /* Lazy inode table initialization info */
1253 struct ext4_li_request *s_li_request;
1254 /* Wait multiplier for lazy initialization thread */
1255 unsigned int s_li_wait_mult;
1256
1257 /* Kernel thread for multiple mount protection */
1258 struct task_struct *s_mmp_tsk;
1259
1260 /* record the last minlen when FITRIM is called. */
1261 atomic_t s_last_trim_minblks;
1262 };
1263
1264 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1265 {
1266 return sb->s_fs_info;
1267 }
1268 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1269 {
1270 return container_of(inode, struct ext4_inode_info, vfs_inode);
1271 }
1272
1273 static inline struct timespec ext4_current_time(struct inode *inode)
1274 {
1275 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1276 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1277 }
1278
1279 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1280 {
1281 return ino == EXT4_ROOT_INO ||
1282 ino == EXT4_JOURNAL_INO ||
1283 ino == EXT4_RESIZE_INO ||
1284 (ino >= EXT4_FIRST_INO(sb) &&
1285 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1286 }
1287
1288 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1289 struct ext4_io_end *io_end)
1290 {
1291 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1292 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1293 atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
1294 }
1295 }
1296
1297 /*
1298 * Inode dynamic state flags
1299 */
1300 enum {
1301 EXT4_STATE_JDATA, /* journaled data exists */
1302 EXT4_STATE_NEW, /* inode is newly created */
1303 EXT4_STATE_XATTR, /* has in-inode xattrs */
1304 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1305 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1306 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1307 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1308 EXT4_STATE_NEWENTRY, /* File just added to dir */
1309 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1310 };
1311
1312 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1313 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1314 { \
1315 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1316 } \
1317 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1318 { \
1319 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1320 } \
1321 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1322 { \
1323 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1324 }
1325
1326 EXT4_INODE_BIT_FNS(flag, flags, 0)
1327 #if (BITS_PER_LONG < 64)
1328 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1329
1330 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1331 {
1332 (ei)->i_state_flags = 0;
1333 }
1334 #else
1335 EXT4_INODE_BIT_FNS(state, flags, 32)
1336
1337 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1338 {
1339 /* We depend on the fact that callers will set i_flags */
1340 }
1341 #endif
1342 #else
1343 /* Assume that user mode programs are passing in an ext4fs superblock, not
1344 * a kernel struct super_block. This will allow us to call the feature-test
1345 * macros from user land. */
1346 #define EXT4_SB(sb) (sb)
1347 #endif
1348
1349 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1350
1351 /*
1352 * Codes for operating systems
1353 */
1354 #define EXT4_OS_LINUX 0
1355 #define EXT4_OS_HURD 1
1356 #define EXT4_OS_MASIX 2
1357 #define EXT4_OS_FREEBSD 3
1358 #define EXT4_OS_LITES 4
1359
1360 /*
1361 * Revision levels
1362 */
1363 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1364 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1365
1366 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1367 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1368
1369 #define EXT4_GOOD_OLD_INODE_SIZE 128
1370
1371 /*
1372 * Feature set definitions
1373 */
1374
1375 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1376 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1377 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1378 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1379 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1380 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1381 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1382 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1383 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1384 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1385 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1386 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1387 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1388 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1389 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1390 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1391 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1392 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1393
1394 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1395 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1396 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1397 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1398 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1399 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1400
1401 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1402 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1403 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1404 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1405 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1406 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1407 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1408 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1409 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1410 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1411
1412 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1413 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1414 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1415 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1416 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1417 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1418 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1419 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1420 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1421 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1422 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1423 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1424 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1425 #define EXT4_FEATURE_INCOMPAT_INLINEDATA 0x8000 /* data in inode */
1426
1427 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1428 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1429 EXT4_FEATURE_INCOMPAT_META_BG)
1430 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1431 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1432 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1433
1434 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1435 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1436 EXT4_FEATURE_INCOMPAT_RECOVER| \
1437 EXT4_FEATURE_INCOMPAT_META_BG)
1438 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1439 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1440 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1441
1442 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1443 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1444 EXT4_FEATURE_INCOMPAT_RECOVER| \
1445 EXT4_FEATURE_INCOMPAT_META_BG| \
1446 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1447 EXT4_FEATURE_INCOMPAT_64BIT| \
1448 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1449 EXT4_FEATURE_INCOMPAT_MMP)
1450 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1451 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1452 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1453 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1454 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1455 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1456 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1457 EXT4_FEATURE_RO_COMPAT_BIGALLOC)
1458
1459 /*
1460 * Default values for user and/or group using reserved blocks
1461 */
1462 #define EXT4_DEF_RESUID 0
1463 #define EXT4_DEF_RESGID 0
1464
1465 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1466
1467 /*
1468 * Default mount options
1469 */
1470 #define EXT4_DEFM_DEBUG 0x0001
1471 #define EXT4_DEFM_BSDGROUPS 0x0002
1472 #define EXT4_DEFM_XATTR_USER 0x0004
1473 #define EXT4_DEFM_ACL 0x0008
1474 #define EXT4_DEFM_UID16 0x0010
1475 #define EXT4_DEFM_JMODE 0x0060
1476 #define EXT4_DEFM_JMODE_DATA 0x0020
1477 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1478 #define EXT4_DEFM_JMODE_WBACK 0x0060
1479 #define EXT4_DEFM_NOBARRIER 0x0100
1480 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1481 #define EXT4_DEFM_DISCARD 0x0400
1482 #define EXT4_DEFM_NODELALLOC 0x0800
1483
1484 /*
1485 * Default journal batch times
1486 */
1487 #define EXT4_DEF_MIN_BATCH_TIME 0
1488 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1489
1490 /*
1491 * Minimum number of groups in a flexgroup before we separate out
1492 * directories into the first block group of a flexgroup
1493 */
1494 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1495
1496 /*
1497 * Structure of a directory entry
1498 */
1499 #define EXT4_NAME_LEN 255
1500
1501 struct ext4_dir_entry {
1502 __le32 inode; /* Inode number */
1503 __le16 rec_len; /* Directory entry length */
1504 __le16 name_len; /* Name length */
1505 char name[EXT4_NAME_LEN]; /* File name */
1506 };
1507
1508 /*
1509 * The new version of the directory entry. Since EXT4 structures are
1510 * stored in intel byte order, and the name_len field could never be
1511 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1512 * file_type field.
1513 */
1514 struct ext4_dir_entry_2 {
1515 __le32 inode; /* Inode number */
1516 __le16 rec_len; /* Directory entry length */
1517 __u8 name_len; /* Name length */
1518 __u8 file_type;
1519 char name[EXT4_NAME_LEN]; /* File name */
1520 };
1521
1522 /*
1523 * Ext4 directory file types. Only the low 3 bits are used. The
1524 * other bits are reserved for now.
1525 */
1526 #define EXT4_FT_UNKNOWN 0
1527 #define EXT4_FT_REG_FILE 1
1528 #define EXT4_FT_DIR 2
1529 #define EXT4_FT_CHRDEV 3
1530 #define EXT4_FT_BLKDEV 4
1531 #define EXT4_FT_FIFO 5
1532 #define EXT4_FT_SOCK 6
1533 #define EXT4_FT_SYMLINK 7
1534
1535 #define EXT4_FT_MAX 8
1536
1537 /*
1538 * EXT4_DIR_PAD defines the directory entries boundaries
1539 *
1540 * NOTE: It must be a multiple of 4
1541 */
1542 #define EXT4_DIR_PAD 4
1543 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1544 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1545 ~EXT4_DIR_ROUND)
1546 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1547
1548 /*
1549 * If we ever get support for fs block sizes > page_size, we'll need
1550 * to remove the #if statements in the next two functions...
1551 */
1552 static inline unsigned int
1553 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1554 {
1555 unsigned len = le16_to_cpu(dlen);
1556
1557 #if (PAGE_CACHE_SIZE >= 65536)
1558 if (len == EXT4_MAX_REC_LEN || len == 0)
1559 return blocksize;
1560 return (len & 65532) | ((len & 3) << 16);
1561 #else
1562 return len;
1563 #endif
1564 }
1565
1566 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1567 {
1568 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1569 BUG();
1570 #if (PAGE_CACHE_SIZE >= 65536)
1571 if (len < 65536)
1572 return cpu_to_le16(len);
1573 if (len == blocksize) {
1574 if (blocksize == 65536)
1575 return cpu_to_le16(EXT4_MAX_REC_LEN);
1576 else
1577 return cpu_to_le16(0);
1578 }
1579 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1580 #else
1581 return cpu_to_le16(len);
1582 #endif
1583 }
1584
1585 /*
1586 * Hash Tree Directory indexing
1587 * (c) Daniel Phillips, 2001
1588 */
1589
1590 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1591 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1592 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1593 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1594 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1595
1596 /* Legal values for the dx_root hash_version field: */
1597
1598 #define DX_HASH_LEGACY 0
1599 #define DX_HASH_HALF_MD4 1
1600 #define DX_HASH_TEA 2
1601 #define DX_HASH_LEGACY_UNSIGNED 3
1602 #define DX_HASH_HALF_MD4_UNSIGNED 4
1603 #define DX_HASH_TEA_UNSIGNED 5
1604
1605 #ifdef __KERNEL__
1606
1607 /* hash info structure used by the directory hash */
1608 struct dx_hash_info
1609 {
1610 u32 hash;
1611 u32 minor_hash;
1612 int hash_version;
1613 u32 *seed;
1614 };
1615
1616 #define EXT4_HTREE_EOF 0x7fffffff
1617
1618 /*
1619 * Control parameters used by ext4_htree_next_block
1620 */
1621 #define HASH_NB_ALWAYS 1
1622
1623
1624 /*
1625 * Describe an inode's exact location on disk and in memory
1626 */
1627 struct ext4_iloc
1628 {
1629 struct buffer_head *bh;
1630 unsigned long offset;
1631 ext4_group_t block_group;
1632 };
1633
1634 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1635 {
1636 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1637 }
1638
1639 /*
1640 * This structure is stuffed into the struct file's private_data field
1641 * for directories. It is where we put information so that we can do
1642 * readdir operations in hash tree order.
1643 */
1644 struct dir_private_info {
1645 struct rb_root root;
1646 struct rb_node *curr_node;
1647 struct fname *extra_fname;
1648 loff_t last_pos;
1649 __u32 curr_hash;
1650 __u32 curr_minor_hash;
1651 __u32 next_hash;
1652 };
1653
1654 /* calculate the first block number of the group */
1655 static inline ext4_fsblk_t
1656 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1657 {
1658 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1659 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1660 }
1661
1662 /*
1663 * Special error return code only used by dx_probe() and its callers.
1664 */
1665 #define ERR_BAD_DX_DIR -75000
1666
1667 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1668 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1669
1670 /*
1671 * Timeout and state flag for lazy initialization inode thread.
1672 */
1673 #define EXT4_DEF_LI_WAIT_MULT 10
1674 #define EXT4_DEF_LI_MAX_START_DELAY 5
1675 #define EXT4_LAZYINIT_QUIT 0x0001
1676 #define EXT4_LAZYINIT_RUNNING 0x0002
1677
1678 /*
1679 * Lazy inode table initialization info
1680 */
1681 struct ext4_lazy_init {
1682 unsigned long li_state;
1683 struct list_head li_request_list;
1684 struct mutex li_list_mtx;
1685 };
1686
1687 struct ext4_li_request {
1688 struct super_block *lr_super;
1689 struct ext4_sb_info *lr_sbi;
1690 ext4_group_t lr_next_group;
1691 struct list_head lr_request;
1692 unsigned long lr_next_sched;
1693 unsigned long lr_timeout;
1694 };
1695
1696 struct ext4_features {
1697 struct kobject f_kobj;
1698 struct completion f_kobj_unregister;
1699 };
1700
1701 /*
1702 * This structure will be used for multiple mount protection. It will be
1703 * written into the block number saved in the s_mmp_block field in the
1704 * superblock. Programs that check MMP should assume that if
1705 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1706 * to use the filesystem, regardless of how old the timestamp is.
1707 */
1708 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1709 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1710 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1711 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1712
1713 struct mmp_struct {
1714 __le32 mmp_magic; /* Magic number for MMP */
1715 __le32 mmp_seq; /* Sequence no. updated periodically */
1716
1717 /*
1718 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1719 * purposes and do not affect the correctness of the algorithm
1720 */
1721 __le64 mmp_time; /* Time last updated */
1722 char mmp_nodename[64]; /* Node which last updated MMP block */
1723 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1724
1725 /*
1726 * mmp_check_interval is used to verify if the MMP block has been
1727 * updated on the block device. The value is updated based on the
1728 * maximum time to write the MMP block during an update cycle.
1729 */
1730 __le16 mmp_check_interval;
1731
1732 __le16 mmp_pad1;
1733 __le32 mmp_pad2[227];
1734 };
1735
1736 /* arguments passed to the mmp thread */
1737 struct mmpd_data {
1738 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1739 struct super_block *sb; /* super block of the fs */
1740 };
1741
1742 /*
1743 * Check interval multiplier
1744 * The MMP block is written every update interval and initially checked every
1745 * update interval x the multiplier (the value is then adapted based on the
1746 * write latency). The reason is that writes can be delayed under load and we
1747 * don't want readers to incorrectly assume that the filesystem is no longer
1748 * in use.
1749 */
1750 #define EXT4_MMP_CHECK_MULT 2UL
1751
1752 /*
1753 * Minimum interval for MMP checking in seconds.
1754 */
1755 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1756
1757 /*
1758 * Maximum interval for MMP checking in seconds.
1759 */
1760 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1761
1762 /*
1763 * Function prototypes
1764 */
1765
1766 /*
1767 * Ok, these declarations are also in <linux/kernel.h> but none of the
1768 * ext4 source programs needs to include it so they are duplicated here.
1769 */
1770 # define NORET_TYPE /**/
1771 # define ATTRIB_NORET __attribute__((noreturn))
1772 # define NORET_AND noreturn,
1773
1774 /* bitmap.c */
1775 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1776
1777 /* balloc.c */
1778 extern unsigned int ext4_block_group(struct super_block *sb,
1779 ext4_fsblk_t blocknr);
1780 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1781 ext4_fsblk_t blocknr);
1782 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1783 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1784 ext4_group_t group);
1785 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1786 ext4_fsblk_t goal,
1787 unsigned int flags,
1788 unsigned long *count,
1789 int *errp);
1790 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1791 s64 nclusters, unsigned int flags);
1792 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1793 extern void ext4_check_blocks_bitmap(struct super_block *);
1794 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1795 ext4_group_t block_group,
1796 struct buffer_head ** bh);
1797 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1798
1799 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1800 ext4_group_t block_group);
1801 extern int ext4_wait_block_bitmap(struct super_block *sb,
1802 ext4_group_t block_group,
1803 struct buffer_head *bh);
1804 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1805 ext4_group_t block_group);
1806 extern void ext4_init_block_bitmap(struct super_block *sb,
1807 struct buffer_head *bh,
1808 ext4_group_t group,
1809 struct ext4_group_desc *desc);
1810 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1811 ext4_group_t block_group,
1812 struct ext4_group_desc *gdp);
1813 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1814 ext4_group_t block_group,
1815 struct ext4_group_desc *gdp);
1816 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1817
1818 /* dir.c */
1819 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1820 struct file *,
1821 struct ext4_dir_entry_2 *,
1822 struct buffer_head *, unsigned int);
1823 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1824 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1825 (de), (bh), (offset)))
1826 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1827 __u32 minor_hash,
1828 struct ext4_dir_entry_2 *dirent);
1829 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1830
1831 /* fsync.c */
1832 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1833 extern int ext4_flush_completed_IO(struct inode *);
1834
1835 /* hash.c */
1836 extern int ext4fs_dirhash(const char *name, int len, struct
1837 dx_hash_info *hinfo);
1838
1839 /* ialloc.c */
1840 extern struct inode *ext4_new_inode(handle_t *, struct inode *, umode_t,
1841 const struct qstr *qstr, __u32 goal,
1842 uid_t *owner);
1843 extern void ext4_free_inode(handle_t *, struct inode *);
1844 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1845 extern unsigned long ext4_count_free_inodes(struct super_block *);
1846 extern unsigned long ext4_count_dirs(struct super_block *);
1847 extern void ext4_check_inodes_bitmap(struct super_block *);
1848 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1849 extern int ext4_init_inode_table(struct super_block *sb,
1850 ext4_group_t group, int barrier);
1851 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
1852
1853 /* mballoc.c */
1854 extern long ext4_mb_stats;
1855 extern long ext4_mb_max_to_scan;
1856 extern int ext4_mb_init(struct super_block *, int);
1857 extern int ext4_mb_release(struct super_block *);
1858 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1859 struct ext4_allocation_request *, int *);
1860 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1861 extern void ext4_discard_preallocations(struct inode *);
1862 extern int __init ext4_init_mballoc(void);
1863 extern void ext4_exit_mballoc(void);
1864 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1865 struct buffer_head *bh, ext4_fsblk_t block,
1866 unsigned long count, int flags);
1867 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1868 ext4_group_t i, struct ext4_group_desc *desc);
1869 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1870 ext4_fsblk_t block, unsigned long count);
1871 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1872
1873 /* inode.c */
1874 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1875 ext4_lblk_t, int, int *);
1876 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1877 ext4_lblk_t, int, int *);
1878 int ext4_get_block(struct inode *inode, sector_t iblock,
1879 struct buffer_head *bh_result, int create);
1880
1881 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1882 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1883 extern int ext4_setattr(struct dentry *, struct iattr *);
1884 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1885 struct kstat *stat);
1886 extern void ext4_evict_inode(struct inode *);
1887 extern void ext4_clear_inode(struct inode *);
1888 extern int ext4_sync_inode(handle_t *, struct inode *);
1889 extern void ext4_dirty_inode(struct inode *, int);
1890 extern int ext4_change_inode_journal_flag(struct inode *, int);
1891 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1892 extern int ext4_can_truncate(struct inode *inode);
1893 extern void ext4_truncate(struct inode *);
1894 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1895 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1896 extern void ext4_set_inode_flags(struct inode *);
1897 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1898 extern int ext4_alloc_da_blocks(struct inode *inode);
1899 extern void ext4_set_aops(struct inode *inode);
1900 extern int ext4_writepage_trans_blocks(struct inode *);
1901 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1902 extern int ext4_discard_partial_page_buffers(handle_t *handle,
1903 struct address_space *mapping, loff_t from,
1904 loff_t length, int flags);
1905 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1906 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1907 extern void ext4_da_update_reserve_space(struct inode *inode,
1908 int used, int quota_claim);
1909
1910 /* indirect.c */
1911 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1912 struct ext4_map_blocks *map, int flags);
1913 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1914 const struct iovec *iov, loff_t offset,
1915 unsigned long nr_segs);
1916 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1917 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1918 extern void ext4_ind_truncate(struct inode *inode);
1919
1920 /* ioctl.c */
1921 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1922 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1923
1924 /* migrate.c */
1925 extern int ext4_ext_migrate(struct inode *);
1926
1927 /* namei.c */
1928 extern int ext4_orphan_add(handle_t *, struct inode *);
1929 extern int ext4_orphan_del(handle_t *, struct inode *);
1930 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1931 __u32 start_minor_hash, __u32 *next_hash);
1932
1933 /* resize.c */
1934 extern int ext4_group_add(struct super_block *sb,
1935 struct ext4_new_group_data *input);
1936 extern int ext4_group_extend(struct super_block *sb,
1937 struct ext4_super_block *es,
1938 ext4_fsblk_t n_blocks_count);
1939 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
1940
1941 /* super.c */
1942 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1943 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1944 extern void ext4_kvfree(void *ptr);
1945 extern __printf(4, 5)
1946 void __ext4_error(struct super_block *, const char *, unsigned int,
1947 const char *, ...);
1948 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1949 __LINE__, ## message)
1950 extern __printf(5, 6)
1951 void ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
1952 const char *, ...);
1953 extern __printf(5, 6)
1954 void ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
1955 const char *, ...);
1956 extern void __ext4_std_error(struct super_block *, const char *,
1957 unsigned int, int);
1958 extern __printf(4, 5)
1959 void __ext4_abort(struct super_block *, const char *, unsigned int,
1960 const char *, ...);
1961 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1962 __LINE__, ## message)
1963 extern __printf(4, 5)
1964 void __ext4_warning(struct super_block *, const char *, unsigned int,
1965 const char *, ...);
1966 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1967 __LINE__, ## message)
1968 extern __printf(3, 4)
1969 void ext4_msg(struct super_block *, const char *, const char *, ...);
1970 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1971 const char *, unsigned int, const char *);
1972 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
1973 __LINE__, msg)
1974 extern __printf(7, 8)
1975 void __ext4_grp_locked_error(const char *, unsigned int,
1976 struct super_block *, ext4_group_t,
1977 unsigned long, ext4_fsblk_t,
1978 const char *, ...);
1979 #define ext4_grp_locked_error(sb, grp, message...) \
1980 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1981 extern void ext4_update_dynamic_rev(struct super_block *sb);
1982 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1983 __u32 compat);
1984 extern int ext4_update_rocompat_feature(handle_t *handle,
1985 struct super_block *sb, __u32 rocompat);
1986 extern int ext4_update_incompat_feature(handle_t *handle,
1987 struct super_block *sb, __u32 incompat);
1988 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1989 struct ext4_group_desc *bg);
1990 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1991 struct ext4_group_desc *bg);
1992 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1993 struct ext4_group_desc *bg);
1994 extern __u32 ext4_free_group_clusters(struct super_block *sb,
1995 struct ext4_group_desc *bg);
1996 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1997 struct ext4_group_desc *bg);
1998 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1999 struct ext4_group_desc *bg);
2000 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2001 struct ext4_group_desc *bg);
2002 extern void ext4_block_bitmap_set(struct super_block *sb,
2003 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2004 extern void ext4_inode_bitmap_set(struct super_block *sb,
2005 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2006 extern void ext4_inode_table_set(struct super_block *sb,
2007 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2008 extern void ext4_free_group_clusters_set(struct super_block *sb,
2009 struct ext4_group_desc *bg,
2010 __u32 count);
2011 extern void ext4_free_inodes_set(struct super_block *sb,
2012 struct ext4_group_desc *bg, __u32 count);
2013 extern void ext4_used_dirs_set(struct super_block *sb,
2014 struct ext4_group_desc *bg, __u32 count);
2015 extern void ext4_itable_unused_set(struct super_block *sb,
2016 struct ext4_group_desc *bg, __u32 count);
2017 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
2018 struct ext4_group_desc *gdp);
2019 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
2020 struct ext4_group_desc *gdp);
2021
2022 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2023 {
2024 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2025 le32_to_cpu(es->s_blocks_count_lo);
2026 }
2027
2028 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2029 {
2030 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2031 le32_to_cpu(es->s_r_blocks_count_lo);
2032 }
2033
2034 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2035 {
2036 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2037 le32_to_cpu(es->s_free_blocks_count_lo);
2038 }
2039
2040 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2041 ext4_fsblk_t blk)
2042 {
2043 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2044 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2045 }
2046
2047 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2048 ext4_fsblk_t blk)
2049 {
2050 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2051 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2052 }
2053
2054 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2055 ext4_fsblk_t blk)
2056 {
2057 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2058 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2059 }
2060
2061 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2062 {
2063 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2064 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2065 le32_to_cpu(raw_inode->i_size_lo);
2066 else
2067 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2068 }
2069
2070 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2071 {
2072 raw_inode->i_size_lo = cpu_to_le32(i_size);
2073 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2074 }
2075
2076 static inline
2077 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2078 ext4_group_t group)
2079 {
2080 struct ext4_group_info ***grp_info;
2081 long indexv, indexh;
2082 grp_info = EXT4_SB(sb)->s_group_info;
2083 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2084 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2085 return grp_info[indexv][indexh];
2086 }
2087
2088 /*
2089 * Reading s_groups_count requires using smp_rmb() afterwards. See
2090 * the locking protocol documented in the comments of ext4_group_add()
2091 * in resize.c
2092 */
2093 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2094 {
2095 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2096
2097 smp_rmb();
2098 return ngroups;
2099 }
2100
2101 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2102 ext4_group_t block_group)
2103 {
2104 return block_group >> sbi->s_log_groups_per_flex;
2105 }
2106
2107 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2108 {
2109 return 1 << sbi->s_log_groups_per_flex;
2110 }
2111
2112 #define ext4_std_error(sb, errno) \
2113 do { \
2114 if ((errno)) \
2115 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2116 } while (0)
2117
2118 #ifdef CONFIG_SMP
2119 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2120 * counters. So we need to make sure we have free clusters more
2121 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2122 */
2123 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2124 #else
2125 #define EXT4_FREECLUSTERS_WATERMARK 0
2126 #endif
2127
2128 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2129 {
2130 /*
2131 * XXX: replace with spinlock if seen contended -bzzz
2132 */
2133 down_write(&EXT4_I(inode)->i_data_sem);
2134 if (newsize > EXT4_I(inode)->i_disksize)
2135 EXT4_I(inode)->i_disksize = newsize;
2136 up_write(&EXT4_I(inode)->i_data_sem);
2137 return ;
2138 }
2139
2140 struct ext4_group_info {
2141 unsigned long bb_state;
2142 struct rb_root bb_free_root;
2143 ext4_grpblk_t bb_first_free; /* first free block */
2144 ext4_grpblk_t bb_free; /* total free blocks */
2145 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2146 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2147 struct list_head bb_prealloc_list;
2148 #ifdef DOUBLE_CHECK
2149 void *bb_bitmap;
2150 #endif
2151 struct rw_semaphore alloc_sem;
2152 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2153 * regions, index is order.
2154 * bb_counters[3] = 5 means
2155 * 5 free 8-block regions. */
2156 };
2157
2158 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2159 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2160
2161 #define EXT4_MB_GRP_NEED_INIT(grp) \
2162 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2163
2164 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2165 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2166 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2167 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2168 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2169 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2170
2171 #define EXT4_MAX_CONTENTION 8
2172 #define EXT4_CONTENTION_THRESHOLD 2
2173
2174 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2175 ext4_group_t group)
2176 {
2177 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2178 }
2179
2180 /*
2181 * Returns true if the filesystem is busy enough that attempts to
2182 * access the block group locks has run into contention.
2183 */
2184 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2185 {
2186 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2187 }
2188
2189 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2190 {
2191 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2192 if (spin_trylock(lock))
2193 /*
2194 * We're able to grab the lock right away, so drop the
2195 * lock contention counter.
2196 */
2197 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2198 else {
2199 /*
2200 * The lock is busy, so bump the contention counter,
2201 * and then wait on the spin lock.
2202 */
2203 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2204 EXT4_MAX_CONTENTION);
2205 spin_lock(lock);
2206 }
2207 }
2208
2209 static inline void ext4_unlock_group(struct super_block *sb,
2210 ext4_group_t group)
2211 {
2212 spin_unlock(ext4_group_lock_ptr(sb, group));
2213 }
2214
2215 static inline void ext4_mark_super_dirty(struct super_block *sb)
2216 {
2217 if (EXT4_SB(sb)->s_journal == NULL)
2218 sb->s_dirt =1;
2219 }
2220
2221 /*
2222 * Block validity checking
2223 */
2224 #define ext4_check_indirect_blockref(inode, bh) \
2225 ext4_check_blockref(__func__, __LINE__, inode, \
2226 (__le32 *)(bh)->b_data, \
2227 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2228
2229 #define ext4_ind_check_inode(inode) \
2230 ext4_check_blockref(__func__, __LINE__, inode, \
2231 EXT4_I(inode)->i_data, \
2232 EXT4_NDIR_BLOCKS)
2233
2234 /*
2235 * Inodes and files operations
2236 */
2237
2238 /* dir.c */
2239 extern const struct file_operations ext4_dir_operations;
2240
2241 /* file.c */
2242 extern const struct inode_operations ext4_file_inode_operations;
2243 extern const struct file_operations ext4_file_operations;
2244 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2245
2246 /* namei.c */
2247 extern const struct inode_operations ext4_dir_inode_operations;
2248 extern const struct inode_operations ext4_special_inode_operations;
2249 extern struct dentry *ext4_get_parent(struct dentry *child);
2250
2251 /* symlink.c */
2252 extern const struct inode_operations ext4_symlink_inode_operations;
2253 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2254
2255 /* block_validity */
2256 extern void ext4_release_system_zone(struct super_block *sb);
2257 extern int ext4_setup_system_zone(struct super_block *sb);
2258 extern int __init ext4_init_system_zone(void);
2259 extern void ext4_exit_system_zone(void);
2260 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2261 ext4_fsblk_t start_blk,
2262 unsigned int count);
2263 extern int ext4_check_blockref(const char *, unsigned int,
2264 struct inode *, __le32 *, unsigned int);
2265
2266 /* extents.c */
2267 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2268 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2269 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2270 int chunk);
2271 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2272 struct ext4_map_blocks *map, int flags);
2273 extern void ext4_ext_truncate(struct inode *);
2274 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2275 loff_t length);
2276 extern void ext4_ext_init(struct super_block *);
2277 extern void ext4_ext_release(struct super_block *);
2278 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2279 loff_t len);
2280 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2281 ssize_t len);
2282 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2283 struct ext4_map_blocks *map, int flags);
2284 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2285 __u64 start, __u64 len);
2286 /* move_extent.c */
2287 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2288 __u64 start_orig, __u64 start_donor,
2289 __u64 len, __u64 *moved_len);
2290
2291 /* page-io.c */
2292 extern int __init ext4_init_pageio(void);
2293 extern void ext4_exit_pageio(void);
2294 extern void ext4_ioend_wait(struct inode *);
2295 extern void ext4_free_io_end(ext4_io_end_t *io);
2296 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2297 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2298 extern void ext4_io_submit(struct ext4_io_submit *io);
2299 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2300 struct page *page,
2301 int len,
2302 struct writeback_control *wbc);
2303
2304 /* mmp.c */
2305 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2306
2307 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2308 enum ext4_state_bits {
2309 BH_Uninit /* blocks are allocated but uninitialized on disk */
2310 = BH_JBDPrivateStart,
2311 BH_AllocFromCluster, /* allocated blocks were part of already
2312 * allocated cluster. Note that this flag will
2313 * never, ever appear in a buffer_head's state
2314 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2315 * this is used. */
2316 BH_Da_Mapped, /* Delayed allocated block that now has a mapping. This
2317 * flag is set when ext4_map_blocks is called on a
2318 * delayed allocated block to get its real mapping. */
2319 };
2320
2321 BUFFER_FNS(Uninit, uninit)
2322 TAS_BUFFER_FNS(Uninit, uninit)
2323 BUFFER_FNS(Da_Mapped, da_mapped)
2324
2325 /*
2326 * Add new method to test wether block and inode bitmaps are properly
2327 * initialized. With uninit_bg reading the block from disk is not enough
2328 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2329 */
2330 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2331
2332 static inline int bitmap_uptodate(struct buffer_head *bh)
2333 {
2334 return (buffer_uptodate(bh) &&
2335 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2336 }
2337 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2338 {
2339 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2340 }
2341
2342 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2343
2344 /* For ioend & aio unwritten conversion wait queues */
2345 #define EXT4_WQ_HASH_SZ 37
2346 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2347 EXT4_WQ_HASH_SZ])
2348 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2349 EXT4_WQ_HASH_SZ])
2350 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2351 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2352
2353 #define EXT4_RESIZING 0
2354 extern int ext4_resize_begin(struct super_block *sb);
2355 extern void ext4_resize_end(struct super_block *sb);
2356
2357 #endif /* __KERNEL__ */
2358
2359 #include "ext4_extents.h"
2360
2361 #endif /* _EXT4_H */
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