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[deliverable/linux.git] / fs / ext4 / ext4.h
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #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 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
148 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
149 EXT4_MAP_UNINIT)
150
151 struct ext4_map_blocks {
152 ext4_fsblk_t m_pblk;
153 ext4_lblk_t m_lblk;
154 unsigned int m_len;
155 unsigned int m_flags;
156 };
157
158 /*
159 * For delayed allocation tracking
160 */
161 struct mpage_da_data {
162 struct inode *inode;
163 sector_t b_blocknr; /* start block number of extent */
164 size_t b_size; /* size of extent */
165 unsigned long b_state; /* state of the extent */
166 unsigned long first_page, next_page; /* extent of pages */
167 struct writeback_control *wbc;
168 int io_done;
169 int pages_written;
170 int retval;
171 };
172
173 /*
174 * Flags for ext4_io_end->flags
175 */
176 #define EXT4_IO_END_UNWRITTEN 0x0001
177 #define EXT4_IO_END_ERROR 0x0002
178 #define EXT4_IO_END_QUEUED 0x0004
179
180 struct ext4_io_page {
181 struct page *p_page;
182 atomic_t p_count;
183 };
184
185 #define MAX_IO_PAGES 128
186
187 typedef struct ext4_io_end {
188 struct list_head list; /* per-file finished IO list */
189 struct inode *inode; /* file being written to */
190 unsigned int flag; /* unwritten or not */
191 struct page *page; /* page struct for buffer write */
192 loff_t offset; /* offset in the file */
193 ssize_t size; /* size of the extent */
194 struct work_struct work; /* data work queue */
195 struct kiocb *iocb; /* iocb struct for AIO */
196 int result; /* error value for AIO */
197 int num_io_pages;
198 struct ext4_io_page *pages[MAX_IO_PAGES];
199 } ext4_io_end_t;
200
201 struct ext4_io_submit {
202 int io_op;
203 struct bio *io_bio;
204 ext4_io_end_t *io_end;
205 struct ext4_io_page *io_page;
206 sector_t io_next_block;
207 };
208
209 /*
210 * Special inodes numbers
211 */
212 #define EXT4_BAD_INO 1 /* Bad blocks inode */
213 #define EXT4_ROOT_INO 2 /* Root inode */
214 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
215 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
216 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
217 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
218 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
219 #define EXT4_JOURNAL_INO 8 /* Journal inode */
220
221 /* First non-reserved inode for old ext4 filesystems */
222 #define EXT4_GOOD_OLD_FIRST_INO 11
223
224 /*
225 * Maximal count of links to a file
226 */
227 #define EXT4_LINK_MAX 65000
228
229 /*
230 * Macro-instructions used to manage several block sizes
231 */
232 #define EXT4_MIN_BLOCK_SIZE 1024
233 #define EXT4_MAX_BLOCK_SIZE 65536
234 #define EXT4_MIN_BLOCK_LOG_SIZE 10
235 #define EXT4_MAX_BLOCK_LOG_SIZE 16
236 #ifdef __KERNEL__
237 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
238 #else
239 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
240 #endif
241 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
242 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
243 EXT4_SB(s)->s_cluster_bits)
244 #ifdef __KERNEL__
245 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
246 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
247 #else
248 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
249 #endif
250 #ifdef __KERNEL__
251 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
252 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
253 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
254 #else
255 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
256 EXT4_GOOD_OLD_INODE_SIZE : \
257 (s)->s_inode_size)
258 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
259 EXT4_GOOD_OLD_FIRST_INO : \
260 (s)->s_first_ino)
261 #endif
262 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
263
264 /* Translate a block number to a cluster number */
265 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
266 /* Translate a cluster number to a block number */
267 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
268 /* Translate # of blks to # of clusters */
269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
270 (sbi)->s_cluster_bits)
271
272 /*
273 * Structure of a blocks group descriptor
274 */
275 struct ext4_group_desc
276 {
277 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
278 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
279 __le32 bg_inode_table_lo; /* Inodes table block */
280 __le16 bg_free_blocks_count_lo;/* Free blocks count */
281 __le16 bg_free_inodes_count_lo;/* Free inodes count */
282 __le16 bg_used_dirs_count_lo; /* Directories count */
283 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
284 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
285 __le16 bg_itable_unused_lo; /* Unused inodes count */
286 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
287 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
288 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
289 __le32 bg_inode_table_hi; /* Inodes table block MSB */
290 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
291 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
292 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
293 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
294 __u32 bg_reserved2[3];
295 };
296
297 /*
298 * Structure of a flex block group info
299 */
300
301 struct flex_groups {
302 atomic_t free_inodes;
303 atomic_t free_clusters;
304 atomic_t used_dirs;
305 };
306
307 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
308 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
309 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
310
311 /*
312 * Macro-instructions used to manage group descriptors
313 */
314 #define EXT4_MIN_DESC_SIZE 32
315 #define EXT4_MIN_DESC_SIZE_64BIT 64
316 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
317 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
318 #ifdef __KERNEL__
319 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
320 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
321 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
322 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
323 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
324 #else
325 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
326 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
327 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
328 #endif
329
330 /*
331 * Constants relative to the data blocks
332 */
333 #define EXT4_NDIR_BLOCKS 12
334 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
335 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
336 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
337 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
338
339 /*
340 * Inode flags
341 */
342 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
343 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
344 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
345 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
346 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
347 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
348 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
349 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
350 /* Reserved for compression usage... */
351 #define EXT4_DIRTY_FL 0x00000100
352 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
353 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
354 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
355 /* End compression flags --- maybe not all used */
356 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
357 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
358 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
359 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
360 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
361 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
362 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
363 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
364 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
365 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
366 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
367
368 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
369 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
370
371 /* Flags that should be inherited by new inodes from their parent. */
372 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
373 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
374 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
375 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
376
377 /* Flags that are appropriate for regular files (all but dir-specific ones). */
378 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
379
380 /* Flags that are appropriate for non-directories/regular files. */
381 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
382
383 /* Mask out flags that are inappropriate for the given type of inode. */
384 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
385 {
386 if (S_ISDIR(mode))
387 return flags;
388 else if (S_ISREG(mode))
389 return flags & EXT4_REG_FLMASK;
390 else
391 return flags & EXT4_OTHER_FLMASK;
392 }
393
394 /*
395 * Inode flags used for atomic set/get
396 */
397 enum {
398 EXT4_INODE_SECRM = 0, /* Secure deletion */
399 EXT4_INODE_UNRM = 1, /* Undelete */
400 EXT4_INODE_COMPR = 2, /* Compress file */
401 EXT4_INODE_SYNC = 3, /* Synchronous updates */
402 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
403 EXT4_INODE_APPEND = 5, /* writes to file may only append */
404 EXT4_INODE_NODUMP = 6, /* do not dump file */
405 EXT4_INODE_NOATIME = 7, /* do not update atime */
406 /* Reserved for compression usage... */
407 EXT4_INODE_DIRTY = 8,
408 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
409 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
410 EXT4_INODE_ECOMPR = 11, /* Compression error */
411 /* End compression flags --- maybe not all used */
412 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
413 EXT4_INODE_IMAGIC = 13, /* AFS directory */
414 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
415 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
416 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
417 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
418 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
419 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
420 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
421 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
422 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
423 };
424
425 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
426 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
427 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
428 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
429
430 /*
431 * Since it's pretty easy to mix up bit numbers and hex values, and we
432 * can't do a compile-time test for ENUM values, we use a run-time
433 * test to make sure that EXT4_XXX_FL is consistent with respect to
434 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
435 * out so it won't cost any extra space in the compiled kernel image.
436 * But it's important that these values are the same, since we are
437 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
438 * must be consistent with the values of FS_XXX_FL defined in
439 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
440 * ext4 filesystems, and of course the values defined in e2fsprogs.
441 *
442 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
443 */
444 static inline void ext4_check_flag_values(void)
445 {
446 CHECK_FLAG_VALUE(SECRM);
447 CHECK_FLAG_VALUE(UNRM);
448 CHECK_FLAG_VALUE(COMPR);
449 CHECK_FLAG_VALUE(SYNC);
450 CHECK_FLAG_VALUE(IMMUTABLE);
451 CHECK_FLAG_VALUE(APPEND);
452 CHECK_FLAG_VALUE(NODUMP);
453 CHECK_FLAG_VALUE(NOATIME);
454 CHECK_FLAG_VALUE(DIRTY);
455 CHECK_FLAG_VALUE(COMPRBLK);
456 CHECK_FLAG_VALUE(NOCOMPR);
457 CHECK_FLAG_VALUE(ECOMPR);
458 CHECK_FLAG_VALUE(INDEX);
459 CHECK_FLAG_VALUE(IMAGIC);
460 CHECK_FLAG_VALUE(JOURNAL_DATA);
461 CHECK_FLAG_VALUE(NOTAIL);
462 CHECK_FLAG_VALUE(DIRSYNC);
463 CHECK_FLAG_VALUE(TOPDIR);
464 CHECK_FLAG_VALUE(HUGE_FILE);
465 CHECK_FLAG_VALUE(EXTENTS);
466 CHECK_FLAG_VALUE(EA_INODE);
467 CHECK_FLAG_VALUE(EOFBLOCKS);
468 CHECK_FLAG_VALUE(RESERVED);
469 }
470
471 /* Used to pass group descriptor data when online resize is done */
472 struct ext4_new_group_input {
473 __u32 group; /* Group number for this data */
474 __u64 block_bitmap; /* Absolute block number of block bitmap */
475 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
476 __u64 inode_table; /* Absolute block number of inode table start */
477 __u32 blocks_count; /* Total number of blocks in this group */
478 __u16 reserved_blocks; /* Number of reserved blocks in this group */
479 __u16 unused;
480 };
481
482 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
483 struct compat_ext4_new_group_input {
484 u32 group;
485 compat_u64 block_bitmap;
486 compat_u64 inode_bitmap;
487 compat_u64 inode_table;
488 u32 blocks_count;
489 u16 reserved_blocks;
490 u16 unused;
491 };
492 #endif
493
494 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
495 struct ext4_new_group_data {
496 __u32 group;
497 __u64 block_bitmap;
498 __u64 inode_bitmap;
499 __u64 inode_table;
500 __u32 blocks_count;
501 __u16 reserved_blocks;
502 __u16 unused;
503 __u32 free_blocks_count;
504 };
505
506 /*
507 * Flags used by ext4_map_blocks()
508 */
509 /* Allocate any needed blocks and/or convert an unitialized
510 extent to be an initialized ext4 */
511 #define EXT4_GET_BLOCKS_CREATE 0x0001
512 /* Request the creation of an unitialized extent */
513 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
514 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
515 EXT4_GET_BLOCKS_CREATE)
516 /* Caller is from the delayed allocation writeout path,
517 so set the magic i_delalloc_reserve_flag after taking the
518 inode allocation semaphore for */
519 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
520 /* caller is from the direct IO path, request to creation of an
521 unitialized extents if not allocated, split the uninitialized
522 extent if blocks has been preallocated already*/
523 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
524 #define EXT4_GET_BLOCKS_CONVERT 0x0010
525 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
526 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
527 /* Convert extent to initialized after IO complete */
528 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
529 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
530 /* Punch out blocks of an extent */
531 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
532 /* Don't normalize allocation size (used for fallocate) */
533 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
534
535 /*
536 * Flags used by ext4_free_blocks
537 */
538 #define EXT4_FREE_BLOCKS_METADATA 0x0001
539 #define EXT4_FREE_BLOCKS_FORGET 0x0002
540 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
541 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
542 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
543 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
544
545 /*
546 * Flags used by ext4_discard_partial_page_buffers
547 */
548 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
549
550 /*
551 * ioctl commands
552 */
553 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
554 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
555 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
556 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
557 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
558 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
559 #ifdef CONFIG_JBD2_DEBUG
560 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
561 #endif
562 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
563 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
564 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
565 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
566 #define EXT4_IOC_MIGRATE _IO('f', 9)
567 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
568 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
569 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
570 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
571
572 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
573 /*
574 * ioctl commands in 32 bit emulation
575 */
576 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
577 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
578 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
579 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
580 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
581 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
582 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
583 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
584 #ifdef CONFIG_JBD2_DEBUG
585 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
586 #endif
587 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
588 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
589 #endif
590
591 /* Max physical block we can address w/o extents */
592 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
593
594 /*
595 * Structure of an inode on the disk
596 */
597 struct ext4_inode {
598 __le16 i_mode; /* File mode */
599 __le16 i_uid; /* Low 16 bits of Owner Uid */
600 __le32 i_size_lo; /* Size in bytes */
601 __le32 i_atime; /* Access time */
602 __le32 i_ctime; /* Inode Change time */
603 __le32 i_mtime; /* Modification time */
604 __le32 i_dtime; /* Deletion Time */
605 __le16 i_gid; /* Low 16 bits of Group Id */
606 __le16 i_links_count; /* Links count */
607 __le32 i_blocks_lo; /* Blocks count */
608 __le32 i_flags; /* File flags */
609 union {
610 struct {
611 __le32 l_i_version;
612 } linux1;
613 struct {
614 __u32 h_i_translator;
615 } hurd1;
616 struct {
617 __u32 m_i_reserved1;
618 } masix1;
619 } osd1; /* OS dependent 1 */
620 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
621 __le32 i_generation; /* File version (for NFS) */
622 __le32 i_file_acl_lo; /* File ACL */
623 __le32 i_size_high;
624 __le32 i_obso_faddr; /* Obsoleted fragment address */
625 union {
626 struct {
627 __le16 l_i_blocks_high; /* were l_i_reserved1 */
628 __le16 l_i_file_acl_high;
629 __le16 l_i_uid_high; /* these 2 fields */
630 __le16 l_i_gid_high; /* were reserved2[0] */
631 __u32 l_i_reserved2;
632 } linux2;
633 struct {
634 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
635 __u16 h_i_mode_high;
636 __u16 h_i_uid_high;
637 __u16 h_i_gid_high;
638 __u32 h_i_author;
639 } hurd2;
640 struct {
641 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
642 __le16 m_i_file_acl_high;
643 __u32 m_i_reserved2[2];
644 } masix2;
645 } osd2; /* OS dependent 2 */
646 __le16 i_extra_isize;
647 __le16 i_pad1;
648 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
649 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
650 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
651 __le32 i_crtime; /* File Creation time */
652 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
653 __le32 i_version_hi; /* high 32 bits for 64-bit version */
654 };
655
656 struct move_extent {
657 __u32 reserved; /* should be zero */
658 __u32 donor_fd; /* donor file descriptor */
659 __u64 orig_start; /* logical start offset in block for orig */
660 __u64 donor_start; /* logical start offset in block for donor */
661 __u64 len; /* block length to be moved */
662 __u64 moved_len; /* moved block length */
663 };
664
665 #define EXT4_EPOCH_BITS 2
666 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
667 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
668
669 /*
670 * Extended fields will fit into an inode if the filesystem was formatted
671 * with large inodes (-I 256 or larger) and there are not currently any EAs
672 * consuming all of the available space. For new inodes we always reserve
673 * enough space for the kernel's known extended fields, but for inodes
674 * created with an old kernel this might not have been the case. None of
675 * the extended inode fields is critical for correct filesystem operation.
676 * This macro checks if a certain field fits in the inode. Note that
677 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
678 */
679 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
680 ((offsetof(typeof(*ext4_inode), field) + \
681 sizeof((ext4_inode)->field)) \
682 <= (EXT4_GOOD_OLD_INODE_SIZE + \
683 (einode)->i_extra_isize)) \
684
685 static inline __le32 ext4_encode_extra_time(struct timespec *time)
686 {
687 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
688 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
689 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
690 }
691
692 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
693 {
694 if (sizeof(time->tv_sec) > 4)
695 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
696 << 32;
697 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
698 }
699
700 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
701 do { \
702 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
703 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
704 (raw_inode)->xtime ## _extra = \
705 ext4_encode_extra_time(&(inode)->xtime); \
706 } while (0)
707
708 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
709 do { \
710 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
711 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
712 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
713 (raw_inode)->xtime ## _extra = \
714 ext4_encode_extra_time(&(einode)->xtime); \
715 } while (0)
716
717 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
718 do { \
719 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
720 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
721 ext4_decode_extra_time(&(inode)->xtime, \
722 raw_inode->xtime ## _extra); \
723 else \
724 (inode)->xtime.tv_nsec = 0; \
725 } while (0)
726
727 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
728 do { \
729 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
730 (einode)->xtime.tv_sec = \
731 (signed)le32_to_cpu((raw_inode)->xtime); \
732 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
733 ext4_decode_extra_time(&(einode)->xtime, \
734 raw_inode->xtime ## _extra); \
735 else \
736 (einode)->xtime.tv_nsec = 0; \
737 } while (0)
738
739 #define i_disk_version osd1.linux1.l_i_version
740
741 #if defined(__KERNEL__) || defined(__linux__)
742 #define i_reserved1 osd1.linux1.l_i_reserved1
743 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
744 #define i_blocks_high osd2.linux2.l_i_blocks_high
745 #define i_uid_low i_uid
746 #define i_gid_low i_gid
747 #define i_uid_high osd2.linux2.l_i_uid_high
748 #define i_gid_high osd2.linux2.l_i_gid_high
749 #define i_reserved2 osd2.linux2.l_i_reserved2
750
751 #elif defined(__GNU__)
752
753 #define i_translator osd1.hurd1.h_i_translator
754 #define i_uid_high osd2.hurd2.h_i_uid_high
755 #define i_gid_high osd2.hurd2.h_i_gid_high
756 #define i_author osd2.hurd2.h_i_author
757
758 #elif defined(__masix__)
759
760 #define i_reserved1 osd1.masix1.m_i_reserved1
761 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
762 #define i_reserved2 osd2.masix2.m_i_reserved2
763
764 #endif /* defined(__KERNEL__) || defined(__linux__) */
765
766 /*
767 * storage for cached extent
768 * If ec_len == 0, then the cache is invalid.
769 * If ec_start == 0, then the cache represents a gap (null mapping)
770 */
771 struct ext4_ext_cache {
772 ext4_fsblk_t ec_start;
773 ext4_lblk_t ec_block;
774 __u32 ec_len; /* must be 32bit to return holes */
775 };
776
777 /*
778 * fourth extended file system inode data in memory
779 */
780 struct ext4_inode_info {
781 __le32 i_data[15]; /* unconverted */
782 __u32 i_dtime;
783 ext4_fsblk_t i_file_acl;
784
785 /*
786 * i_block_group is the number of the block group which contains
787 * this file's inode. Constant across the lifetime of the inode,
788 * it is ued for making block allocation decisions - we try to
789 * place a file's data blocks near its inode block, and new inodes
790 * near to their parent directory's inode.
791 */
792 ext4_group_t i_block_group;
793 ext4_lblk_t i_dir_start_lookup;
794 #if (BITS_PER_LONG < 64)
795 unsigned long i_state_flags; /* Dynamic state flags */
796 #endif
797 unsigned long i_flags;
798
799 #ifdef CONFIG_EXT4_FS_XATTR
800 /*
801 * Extended attributes can be read independently of the main file
802 * data. Taking i_mutex even when reading would cause contention
803 * between readers of EAs and writers of regular file data, so
804 * instead we synchronize on xattr_sem when reading or changing
805 * EAs.
806 */
807 struct rw_semaphore xattr_sem;
808 #endif
809
810 struct list_head i_orphan; /* unlinked but open inodes */
811
812 /*
813 * i_disksize keeps track of what the inode size is ON DISK, not
814 * in memory. During truncate, i_size is set to the new size by
815 * the VFS prior to calling ext4_truncate(), but the filesystem won't
816 * set i_disksize to 0 until the truncate is actually under way.
817 *
818 * The intent is that i_disksize always represents the blocks which
819 * are used by this file. This allows recovery to restart truncate
820 * on orphans if we crash during truncate. We actually write i_disksize
821 * into the on-disk inode when writing inodes out, instead of i_size.
822 *
823 * The only time when i_disksize and i_size may be different is when
824 * a truncate is in progress. The only things which change i_disksize
825 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
826 */
827 loff_t i_disksize;
828
829 /*
830 * i_data_sem is for serialising ext4_truncate() against
831 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
832 * data tree are chopped off during truncate. We can't do that in
833 * ext4 because whenever we perform intermediate commits during
834 * truncate, the inode and all the metadata blocks *must* be in a
835 * consistent state which allows truncation of the orphans to restart
836 * during recovery. Hence we must fix the get_block-vs-truncate race
837 * by other means, so we have i_data_sem.
838 */
839 struct rw_semaphore i_data_sem;
840 struct inode vfs_inode;
841 struct jbd2_inode *jinode;
842
843 struct ext4_ext_cache i_cached_extent;
844 /*
845 * File creation time. Its function is same as that of
846 * struct timespec i_{a,c,m}time in the generic inode.
847 */
848 struct timespec i_crtime;
849
850 /* mballoc */
851 struct list_head i_prealloc_list;
852 spinlock_t i_prealloc_lock;
853
854 /* ialloc */
855 ext4_group_t i_last_alloc_group;
856
857 /* allocation reservation info for delalloc */
858 /* In case of bigalloc, these refer to clusters rather than blocks */
859 unsigned int i_reserved_data_blocks;
860 unsigned int i_reserved_meta_blocks;
861 unsigned int i_allocated_meta_blocks;
862 ext4_lblk_t i_da_metadata_calc_last_lblock;
863 int i_da_metadata_calc_len;
864
865 /* on-disk additional length */
866 __u16 i_extra_isize;
867
868 #ifdef CONFIG_QUOTA
869 /* quota space reservation, managed internally by quota code */
870 qsize_t i_reserved_quota;
871 #endif
872
873 /* completed IOs that might need unwritten extents handling */
874 struct list_head i_completed_io_list;
875 spinlock_t i_completed_io_lock;
876 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
877 /* current io_end structure for async DIO write*/
878 ext4_io_end_t *cur_aio_dio;
879 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
880
881 spinlock_t i_block_reservation_lock;
882
883 /*
884 * Transactions that contain inode's metadata needed to complete
885 * fsync and fdatasync, respectively.
886 */
887 tid_t i_sync_tid;
888 tid_t i_datasync_tid;
889 };
890
891 /*
892 * File system states
893 */
894 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
895 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
896 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
897
898 /*
899 * Misc. filesystem flags
900 */
901 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
902 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
903 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
904
905 /*
906 * Mount flags
907 */
908 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
909 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
910 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
911 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
912 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
913 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
914 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
915 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
916 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
917 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
918 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
919 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
920 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
921 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
922 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
923 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
924 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
925 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
926 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
927 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
928 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
929 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
930 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
931 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
932 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
933 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
934 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
935 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
936 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
937 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
938 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
939
940 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
941 specified delalloc */
942
943 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
944 ~EXT4_MOUNT_##opt
945 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
946 EXT4_MOUNT_##opt
947 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
948 EXT4_MOUNT_##opt)
949
950 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
951 ~EXT4_MOUNT2_##opt
952 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
953 EXT4_MOUNT2_##opt
954 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
955 EXT4_MOUNT2_##opt)
956
957 #define ext4_set_bit __test_and_set_bit_le
958 #define ext4_set_bit_atomic ext2_set_bit_atomic
959 #define ext4_clear_bit __test_and_clear_bit_le
960 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
961 #define ext4_test_bit test_bit_le
962 #define ext4_find_first_zero_bit find_first_zero_bit_le
963 #define ext4_find_next_zero_bit find_next_zero_bit_le
964 #define ext4_find_next_bit find_next_bit_le
965
966 extern void ext4_set_bits(void *bm, int cur, int len);
967
968 /*
969 * Maximal mount counts between two filesystem checks
970 */
971 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
972 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
973
974 /*
975 * Behaviour when detecting errors
976 */
977 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
978 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
979 #define EXT4_ERRORS_PANIC 3 /* Panic */
980 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
981
982 /*
983 * Structure of the super block
984 */
985 struct ext4_super_block {
986 /*00*/ __le32 s_inodes_count; /* Inodes count */
987 __le32 s_blocks_count_lo; /* Blocks count */
988 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
989 __le32 s_free_blocks_count_lo; /* Free blocks count */
990 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
991 __le32 s_first_data_block; /* First Data Block */
992 __le32 s_log_block_size; /* Block size */
993 __le32 s_log_cluster_size; /* Allocation cluster size */
994 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
995 __le32 s_clusters_per_group; /* # Clusters per group */
996 __le32 s_inodes_per_group; /* # Inodes per group */
997 __le32 s_mtime; /* Mount time */
998 /*30*/ __le32 s_wtime; /* Write time */
999 __le16 s_mnt_count; /* Mount count */
1000 __le16 s_max_mnt_count; /* Maximal mount count */
1001 __le16 s_magic; /* Magic signature */
1002 __le16 s_state; /* File system state */
1003 __le16 s_errors; /* Behaviour when detecting errors */
1004 __le16 s_minor_rev_level; /* minor revision level */
1005 /*40*/ __le32 s_lastcheck; /* time of last check */
1006 __le32 s_checkinterval; /* max. time between checks */
1007 __le32 s_creator_os; /* OS */
1008 __le32 s_rev_level; /* Revision level */
1009 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1010 __le16 s_def_resgid; /* Default gid for reserved blocks */
1011 /*
1012 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1013 *
1014 * Note: the difference between the compatible feature set and
1015 * the incompatible feature set is that if there is a bit set
1016 * in the incompatible feature set that the kernel doesn't
1017 * know about, it should refuse to mount the filesystem.
1018 *
1019 * e2fsck's requirements are more strict; if it doesn't know
1020 * about a feature in either the compatible or incompatible
1021 * feature set, it must abort and not try to meddle with
1022 * things it doesn't understand...
1023 */
1024 __le32 s_first_ino; /* First non-reserved inode */
1025 __le16 s_inode_size; /* size of inode structure */
1026 __le16 s_block_group_nr; /* block group # of this superblock */
1027 __le32 s_feature_compat; /* compatible feature set */
1028 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1029 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1030 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1031 /*78*/ char s_volume_name[16]; /* volume name */
1032 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1033 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1034 /*
1035 * Performance hints. Directory preallocation should only
1036 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1037 */
1038 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1039 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1040 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1041 /*
1042 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1043 */
1044 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1045 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1046 __le32 s_journal_dev; /* device number of journal file */
1047 __le32 s_last_orphan; /* start of list of inodes to delete */
1048 __le32 s_hash_seed[4]; /* HTREE hash seed */
1049 __u8 s_def_hash_version; /* Default hash version to use */
1050 __u8 s_jnl_backup_type;
1051 __le16 s_desc_size; /* size of group descriptor */
1052 /*100*/ __le32 s_default_mount_opts;
1053 __le32 s_first_meta_bg; /* First metablock block group */
1054 __le32 s_mkfs_time; /* When the filesystem was created */
1055 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1056 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1057 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1058 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1059 __le32 s_free_blocks_count_hi; /* Free blocks count */
1060 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1061 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1062 __le32 s_flags; /* Miscellaneous flags */
1063 __le16 s_raid_stride; /* RAID stride */
1064 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1065 __le64 s_mmp_block; /* Block for multi-mount protection */
1066 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1067 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1068 __u8 s_reserved_char_pad;
1069 __le16 s_reserved_pad;
1070 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1071 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1072 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1073 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1074 snapshot's future use */
1075 __le32 s_snapshot_list; /* inode number of the head of the
1076 on-disk snapshot list */
1077 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1078 __le32 s_error_count; /* number of fs errors */
1079 __le32 s_first_error_time; /* first time an error happened */
1080 __le32 s_first_error_ino; /* inode involved in first error */
1081 __le64 s_first_error_block; /* block involved of first error */
1082 __u8 s_first_error_func[32]; /* function where the error happened */
1083 __le32 s_first_error_line; /* line number where error happened */
1084 __le32 s_last_error_time; /* most recent time of an error */
1085 __le32 s_last_error_ino; /* inode involved in last error */
1086 __le32 s_last_error_line; /* line number where error happened */
1087 __le64 s_last_error_block; /* block involved of last error */
1088 __u8 s_last_error_func[32]; /* function where the error happened */
1089 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1090 __u8 s_mount_opts[64];
1091 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1092 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1093 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1094 __le32 s_reserved[109]; /* Padding to the end of the block */
1095 };
1096
1097 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1098
1099 #ifdef __KERNEL__
1100
1101 /*
1102 * run-time mount flags
1103 */
1104 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1105 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1106
1107 /*
1108 * fourth extended-fs super-block data in memory
1109 */
1110 struct ext4_sb_info {
1111 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1112 unsigned long s_inodes_per_block;/* Number of inodes per block */
1113 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1114 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1115 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1116 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1117 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1118 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1119 ext4_group_t s_groups_count; /* Number of groups in the fs */
1120 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1121 unsigned long s_overhead_last; /* Last calculated overhead */
1122 unsigned long s_blocks_last; /* Last seen block count */
1123 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1124 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1125 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1126 struct buffer_head * s_sbh; /* Buffer containing the super block */
1127 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1128 struct buffer_head **s_group_desc;
1129 unsigned int s_mount_opt;
1130 unsigned int s_mount_opt2;
1131 unsigned int s_mount_flags;
1132 ext4_fsblk_t s_sb_block;
1133 uid_t s_resuid;
1134 gid_t s_resgid;
1135 unsigned short s_mount_state;
1136 unsigned short s_pad;
1137 int s_addr_per_block_bits;
1138 int s_desc_per_block_bits;
1139 int s_inode_size;
1140 int s_first_ino;
1141 unsigned int s_inode_readahead_blks;
1142 unsigned int s_inode_goal;
1143 spinlock_t s_next_gen_lock;
1144 u32 s_next_generation;
1145 u32 s_hash_seed[4];
1146 int s_def_hash_version;
1147 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1148 struct percpu_counter s_freeclusters_counter;
1149 struct percpu_counter s_freeinodes_counter;
1150 struct percpu_counter s_dirs_counter;
1151 struct percpu_counter s_dirtyclusters_counter;
1152 struct blockgroup_lock *s_blockgroup_lock;
1153 struct proc_dir_entry *s_proc;
1154 struct kobject s_kobj;
1155 struct completion s_kobj_unregister;
1156
1157 /* Journaling */
1158 struct journal_s *s_journal;
1159 struct list_head s_orphan;
1160 struct mutex s_orphan_lock;
1161 unsigned long s_resize_flags; /* Flags indicating if there
1162 is a resizer */
1163 unsigned long s_commit_interval;
1164 u32 s_max_batch_time;
1165 u32 s_min_batch_time;
1166 struct block_device *journal_bdev;
1167 #ifdef CONFIG_JBD2_DEBUG
1168 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1169 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1170 #endif
1171 #ifdef CONFIG_QUOTA
1172 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1173 int s_jquota_fmt; /* Format of quota to use */
1174 #endif
1175 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1176 struct rb_root system_blks;
1177
1178 #ifdef EXTENTS_STATS
1179 /* ext4 extents stats */
1180 unsigned long s_ext_min;
1181 unsigned long s_ext_max;
1182 unsigned long s_depth_max;
1183 spinlock_t s_ext_stats_lock;
1184 unsigned long s_ext_blocks;
1185 unsigned long s_ext_extents;
1186 #endif
1187 /* ext4 extent cache stats */
1188 unsigned long extent_cache_hits;
1189 unsigned long extent_cache_misses;
1190
1191 /* for buddy allocator */
1192 struct ext4_group_info ***s_group_info;
1193 struct inode *s_buddy_cache;
1194 spinlock_t s_md_lock;
1195 unsigned short *s_mb_offsets;
1196 unsigned int *s_mb_maxs;
1197
1198 /* tunables */
1199 unsigned long s_stripe;
1200 unsigned int s_mb_stream_request;
1201 unsigned int s_mb_max_to_scan;
1202 unsigned int s_mb_min_to_scan;
1203 unsigned int s_mb_stats;
1204 unsigned int s_mb_order2_reqs;
1205 unsigned int s_mb_group_prealloc;
1206 unsigned int s_max_writeback_mb_bump;
1207 /* where last allocation was done - for stream allocation */
1208 unsigned long s_mb_last_group;
1209 unsigned long s_mb_last_start;
1210
1211 /* stats for buddy allocator */
1212 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1213 atomic_t s_bal_success; /* we found long enough chunks */
1214 atomic_t s_bal_allocated; /* in blocks */
1215 atomic_t s_bal_ex_scanned; /* total extents scanned */
1216 atomic_t s_bal_goals; /* goal hits */
1217 atomic_t s_bal_breaks; /* too long searches */
1218 atomic_t s_bal_2orders; /* 2^order hits */
1219 spinlock_t s_bal_lock;
1220 unsigned long s_mb_buddies_generated;
1221 unsigned long long s_mb_generation_time;
1222 atomic_t s_mb_lost_chunks;
1223 atomic_t s_mb_preallocated;
1224 atomic_t s_mb_discarded;
1225 atomic_t s_lock_busy;
1226
1227 /* locality groups */
1228 struct ext4_locality_group __percpu *s_locality_groups;
1229
1230 /* for write statistics */
1231 unsigned long s_sectors_written_start;
1232 u64 s_kbytes_written;
1233
1234 unsigned int s_log_groups_per_flex;
1235 struct flex_groups *s_flex_groups;
1236
1237 /* workqueue for dio unwritten */
1238 struct workqueue_struct *dio_unwritten_wq;
1239
1240 /* timer for periodic error stats printing */
1241 struct timer_list s_err_report;
1242
1243 /* Lazy inode table initialization info */
1244 struct ext4_li_request *s_li_request;
1245 /* Wait multiplier for lazy initialization thread */
1246 unsigned int s_li_wait_mult;
1247
1248 /* Kernel thread for multiple mount protection */
1249 struct task_struct *s_mmp_tsk;
1250
1251 /* record the last minlen when FITRIM is called. */
1252 atomic_t s_last_trim_minblks;
1253 };
1254
1255 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1256 {
1257 return sb->s_fs_info;
1258 }
1259 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1260 {
1261 return container_of(inode, struct ext4_inode_info, vfs_inode);
1262 }
1263
1264 static inline struct timespec ext4_current_time(struct inode *inode)
1265 {
1266 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1267 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1268 }
1269
1270 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1271 {
1272 return ino == EXT4_ROOT_INO ||
1273 ino == EXT4_JOURNAL_INO ||
1274 ino == EXT4_RESIZE_INO ||
1275 (ino >= EXT4_FIRST_INO(sb) &&
1276 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1277 }
1278
1279 /*
1280 * Inode dynamic state flags
1281 */
1282 enum {
1283 EXT4_STATE_JDATA, /* journaled data exists */
1284 EXT4_STATE_NEW, /* inode is newly created */
1285 EXT4_STATE_XATTR, /* has in-inode xattrs */
1286 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1287 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1288 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1289 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1290 EXT4_STATE_NEWENTRY, /* File just added to dir */
1291 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1292 };
1293
1294 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1295 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1296 { \
1297 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1298 } \
1299 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1300 { \
1301 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1302 } \
1303 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1304 { \
1305 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1306 }
1307
1308 EXT4_INODE_BIT_FNS(flag, flags, 0)
1309 #if (BITS_PER_LONG < 64)
1310 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1311
1312 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1313 {
1314 (ei)->i_state_flags = 0;
1315 }
1316 #else
1317 EXT4_INODE_BIT_FNS(state, flags, 32)
1318
1319 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1320 {
1321 /* We depend on the fact that callers will set i_flags */
1322 }
1323 #endif
1324 #else
1325 /* Assume that user mode programs are passing in an ext4fs superblock, not
1326 * a kernel struct super_block. This will allow us to call the feature-test
1327 * macros from user land. */
1328 #define EXT4_SB(sb) (sb)
1329 #endif
1330
1331 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1332
1333 /*
1334 * Codes for operating systems
1335 */
1336 #define EXT4_OS_LINUX 0
1337 #define EXT4_OS_HURD 1
1338 #define EXT4_OS_MASIX 2
1339 #define EXT4_OS_FREEBSD 3
1340 #define EXT4_OS_LITES 4
1341
1342 /*
1343 * Revision levels
1344 */
1345 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1346 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1347
1348 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1349 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1350
1351 #define EXT4_GOOD_OLD_INODE_SIZE 128
1352
1353 /*
1354 * Feature set definitions
1355 */
1356
1357 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1358 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1359 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1360 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1361 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1362 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1363 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1364 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1365 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1366 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1367 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1368 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1369 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1370 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1371 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1372 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1373 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1374 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1375
1376 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1377 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1378 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1379 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1380 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1381 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1382
1383 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1384 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1385 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1386 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1387 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1388 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1389 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1390 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1391 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1392
1393 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1394 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1395 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1396 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1397 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1398 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1399 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1400 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1401 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1402 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1403 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1404
1405 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1406 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1407 EXT4_FEATURE_INCOMPAT_META_BG)
1408 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1409 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1410 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1411
1412 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1413 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1414 EXT4_FEATURE_INCOMPAT_RECOVER| \
1415 EXT4_FEATURE_INCOMPAT_META_BG)
1416 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1417 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1418 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1419
1420 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1421 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1422 EXT4_FEATURE_INCOMPAT_RECOVER| \
1423 EXT4_FEATURE_INCOMPAT_META_BG| \
1424 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1425 EXT4_FEATURE_INCOMPAT_64BIT| \
1426 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1427 EXT4_FEATURE_INCOMPAT_MMP)
1428 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1429 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1430 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1431 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1432 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1433 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1434 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1435
1436 /*
1437 * Default values for user and/or group using reserved blocks
1438 */
1439 #define EXT4_DEF_RESUID 0
1440 #define EXT4_DEF_RESGID 0
1441
1442 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1443
1444 /*
1445 * Default mount options
1446 */
1447 #define EXT4_DEFM_DEBUG 0x0001
1448 #define EXT4_DEFM_BSDGROUPS 0x0002
1449 #define EXT4_DEFM_XATTR_USER 0x0004
1450 #define EXT4_DEFM_ACL 0x0008
1451 #define EXT4_DEFM_UID16 0x0010
1452 #define EXT4_DEFM_JMODE 0x0060
1453 #define EXT4_DEFM_JMODE_DATA 0x0020
1454 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1455 #define EXT4_DEFM_JMODE_WBACK 0x0060
1456 #define EXT4_DEFM_NOBARRIER 0x0100
1457 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1458 #define EXT4_DEFM_DISCARD 0x0400
1459 #define EXT4_DEFM_NODELALLOC 0x0800
1460
1461 /*
1462 * Default journal batch times
1463 */
1464 #define EXT4_DEF_MIN_BATCH_TIME 0
1465 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1466
1467 /*
1468 * Minimum number of groups in a flexgroup before we separate out
1469 * directories into the first block group of a flexgroup
1470 */
1471 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1472
1473 /*
1474 * Structure of a directory entry
1475 */
1476 #define EXT4_NAME_LEN 255
1477
1478 struct ext4_dir_entry {
1479 __le32 inode; /* Inode number */
1480 __le16 rec_len; /* Directory entry length */
1481 __le16 name_len; /* Name length */
1482 char name[EXT4_NAME_LEN]; /* File name */
1483 };
1484
1485 /*
1486 * The new version of the directory entry. Since EXT4 structures are
1487 * stored in intel byte order, and the name_len field could never be
1488 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1489 * file_type field.
1490 */
1491 struct ext4_dir_entry_2 {
1492 __le32 inode; /* Inode number */
1493 __le16 rec_len; /* Directory entry length */
1494 __u8 name_len; /* Name length */
1495 __u8 file_type;
1496 char name[EXT4_NAME_LEN]; /* File name */
1497 };
1498
1499 /*
1500 * Ext4 directory file types. Only the low 3 bits are used. The
1501 * other bits are reserved for now.
1502 */
1503 #define EXT4_FT_UNKNOWN 0
1504 #define EXT4_FT_REG_FILE 1
1505 #define EXT4_FT_DIR 2
1506 #define EXT4_FT_CHRDEV 3
1507 #define EXT4_FT_BLKDEV 4
1508 #define EXT4_FT_FIFO 5
1509 #define EXT4_FT_SOCK 6
1510 #define EXT4_FT_SYMLINK 7
1511
1512 #define EXT4_FT_MAX 8
1513
1514 /*
1515 * EXT4_DIR_PAD defines the directory entries boundaries
1516 *
1517 * NOTE: It must be a multiple of 4
1518 */
1519 #define EXT4_DIR_PAD 4
1520 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1521 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1522 ~EXT4_DIR_ROUND)
1523 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1524
1525 /*
1526 * If we ever get support for fs block sizes > page_size, we'll need
1527 * to remove the #if statements in the next two functions...
1528 */
1529 static inline unsigned int
1530 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1531 {
1532 unsigned len = le16_to_cpu(dlen);
1533
1534 #if (PAGE_CACHE_SIZE >= 65536)
1535 if (len == EXT4_MAX_REC_LEN || len == 0)
1536 return blocksize;
1537 return (len & 65532) | ((len & 3) << 16);
1538 #else
1539 return len;
1540 #endif
1541 }
1542
1543 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1544 {
1545 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1546 BUG();
1547 #if (PAGE_CACHE_SIZE >= 65536)
1548 if (len < 65536)
1549 return cpu_to_le16(len);
1550 if (len == blocksize) {
1551 if (blocksize == 65536)
1552 return cpu_to_le16(EXT4_MAX_REC_LEN);
1553 else
1554 return cpu_to_le16(0);
1555 }
1556 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1557 #else
1558 return cpu_to_le16(len);
1559 #endif
1560 }
1561
1562 /*
1563 * Hash Tree Directory indexing
1564 * (c) Daniel Phillips, 2001
1565 */
1566
1567 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1568 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1569 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1570 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1571 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1572
1573 /* Legal values for the dx_root hash_version field: */
1574
1575 #define DX_HASH_LEGACY 0
1576 #define DX_HASH_HALF_MD4 1
1577 #define DX_HASH_TEA 2
1578 #define DX_HASH_LEGACY_UNSIGNED 3
1579 #define DX_HASH_HALF_MD4_UNSIGNED 4
1580 #define DX_HASH_TEA_UNSIGNED 5
1581
1582 #ifdef __KERNEL__
1583
1584 /* hash info structure used by the directory hash */
1585 struct dx_hash_info
1586 {
1587 u32 hash;
1588 u32 minor_hash;
1589 int hash_version;
1590 u32 *seed;
1591 };
1592
1593 #define EXT4_HTREE_EOF 0x7fffffff
1594
1595 /*
1596 * Control parameters used by ext4_htree_next_block
1597 */
1598 #define HASH_NB_ALWAYS 1
1599
1600
1601 /*
1602 * Describe an inode's exact location on disk and in memory
1603 */
1604 struct ext4_iloc
1605 {
1606 struct buffer_head *bh;
1607 unsigned long offset;
1608 ext4_group_t block_group;
1609 };
1610
1611 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1612 {
1613 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1614 }
1615
1616 /*
1617 * This structure is stuffed into the struct file's private_data field
1618 * for directories. It is where we put information so that we can do
1619 * readdir operations in hash tree order.
1620 */
1621 struct dir_private_info {
1622 struct rb_root root;
1623 struct rb_node *curr_node;
1624 struct fname *extra_fname;
1625 loff_t last_pos;
1626 __u32 curr_hash;
1627 __u32 curr_minor_hash;
1628 __u32 next_hash;
1629 };
1630
1631 /* calculate the first block number of the group */
1632 static inline ext4_fsblk_t
1633 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1634 {
1635 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1636 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1637 }
1638
1639 /*
1640 * Special error return code only used by dx_probe() and its callers.
1641 */
1642 #define ERR_BAD_DX_DIR -75000
1643
1644 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1645 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1646
1647 /*
1648 * Timeout and state flag for lazy initialization inode thread.
1649 */
1650 #define EXT4_DEF_LI_WAIT_MULT 10
1651 #define EXT4_DEF_LI_MAX_START_DELAY 5
1652 #define EXT4_LAZYINIT_QUIT 0x0001
1653 #define EXT4_LAZYINIT_RUNNING 0x0002
1654
1655 /*
1656 * Lazy inode table initialization info
1657 */
1658 struct ext4_lazy_init {
1659 unsigned long li_state;
1660 struct list_head li_request_list;
1661 struct mutex li_list_mtx;
1662 };
1663
1664 struct ext4_li_request {
1665 struct super_block *lr_super;
1666 struct ext4_sb_info *lr_sbi;
1667 ext4_group_t lr_next_group;
1668 struct list_head lr_request;
1669 unsigned long lr_next_sched;
1670 unsigned long lr_timeout;
1671 };
1672
1673 struct ext4_features {
1674 struct kobject f_kobj;
1675 struct completion f_kobj_unregister;
1676 };
1677
1678 /*
1679 * This structure will be used for multiple mount protection. It will be
1680 * written into the block number saved in the s_mmp_block field in the
1681 * superblock. Programs that check MMP should assume that if
1682 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1683 * to use the filesystem, regardless of how old the timestamp is.
1684 */
1685 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1686 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1687 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1688 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1689
1690 struct mmp_struct {
1691 __le32 mmp_magic; /* Magic number for MMP */
1692 __le32 mmp_seq; /* Sequence no. updated periodically */
1693
1694 /*
1695 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1696 * purposes and do not affect the correctness of the algorithm
1697 */
1698 __le64 mmp_time; /* Time last updated */
1699 char mmp_nodename[64]; /* Node which last updated MMP block */
1700 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1701
1702 /*
1703 * mmp_check_interval is used to verify if the MMP block has been
1704 * updated on the block device. The value is updated based on the
1705 * maximum time to write the MMP block during an update cycle.
1706 */
1707 __le16 mmp_check_interval;
1708
1709 __le16 mmp_pad1;
1710 __le32 mmp_pad2[227];
1711 };
1712
1713 /* arguments passed to the mmp thread */
1714 struct mmpd_data {
1715 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1716 struct super_block *sb; /* super block of the fs */
1717 };
1718
1719 /*
1720 * Check interval multiplier
1721 * The MMP block is written every update interval and initially checked every
1722 * update interval x the multiplier (the value is then adapted based on the
1723 * write latency). The reason is that writes can be delayed under load and we
1724 * don't want readers to incorrectly assume that the filesystem is no longer
1725 * in use.
1726 */
1727 #define EXT4_MMP_CHECK_MULT 2UL
1728
1729 /*
1730 * Minimum interval for MMP checking in seconds.
1731 */
1732 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1733
1734 /*
1735 * Maximum interval for MMP checking in seconds.
1736 */
1737 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1738
1739 /*
1740 * Function prototypes
1741 */
1742
1743 /*
1744 * Ok, these declarations are also in <linux/kernel.h> but none of the
1745 * ext4 source programs needs to include it so they are duplicated here.
1746 */
1747 # define NORET_TYPE /**/
1748 # define ATTRIB_NORET __attribute__((noreturn))
1749 # define NORET_AND noreturn,
1750
1751 /* bitmap.c */
1752 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1753
1754 /* balloc.c */
1755 extern unsigned int ext4_block_group(struct super_block *sb,
1756 ext4_fsblk_t blocknr);
1757 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1758 ext4_fsblk_t blocknr);
1759 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1760 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1761 ext4_group_t group);
1762 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1763 ext4_fsblk_t goal,
1764 unsigned int flags,
1765 unsigned long *count,
1766 int *errp);
1767 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
1768 s64 nblocks, unsigned int flags);
1769 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1770 extern void ext4_check_blocks_bitmap(struct super_block *);
1771 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1772 ext4_group_t block_group,
1773 struct buffer_head ** bh);
1774 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1775 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1776 ext4_group_t block_group);
1777 extern void ext4_init_block_bitmap(struct super_block *sb,
1778 struct buffer_head *bh,
1779 ext4_group_t group,
1780 struct ext4_group_desc *desc);
1781 extern unsigned ext4_free_blocks_after_init(struct super_block *sb,
1782 ext4_group_t block_group,
1783 struct ext4_group_desc *gdp);
1784 extern unsigned ext4_num_base_meta_clusters(struct super_block *sb,
1785 ext4_group_t block_group);
1786 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1787 ext4_group_t block_group,
1788 struct ext4_group_desc *gdp);
1789 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1790
1791 /* dir.c */
1792 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1793 struct file *,
1794 struct ext4_dir_entry_2 *,
1795 struct buffer_head *, unsigned int);
1796 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1797 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1798 (de), (bh), (offset)))
1799 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1800 __u32 minor_hash,
1801 struct ext4_dir_entry_2 *dirent);
1802 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1803
1804 /* fsync.c */
1805 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1806 extern int ext4_flush_completed_IO(struct inode *);
1807
1808 /* hash.c */
1809 extern int ext4fs_dirhash(const char *name, int len, struct
1810 dx_hash_info *hinfo);
1811
1812 /* ialloc.c */
1813 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1814 const struct qstr *qstr, __u32 goal);
1815 extern void ext4_free_inode(handle_t *, struct inode *);
1816 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1817 extern unsigned long ext4_count_free_inodes(struct super_block *);
1818 extern unsigned long ext4_count_dirs(struct super_block *);
1819 extern void ext4_check_inodes_bitmap(struct super_block *);
1820 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1821 extern int ext4_init_inode_table(struct super_block *sb,
1822 ext4_group_t group, int barrier);
1823
1824 /* mballoc.c */
1825 extern long ext4_mb_stats;
1826 extern long ext4_mb_max_to_scan;
1827 extern int ext4_mb_init(struct super_block *, int);
1828 extern int ext4_mb_release(struct super_block *);
1829 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1830 struct ext4_allocation_request *, int *);
1831 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1832 extern void ext4_discard_preallocations(struct inode *);
1833 extern int __init ext4_init_mballoc(void);
1834 extern void ext4_exit_mballoc(void);
1835 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1836 struct buffer_head *bh, ext4_fsblk_t block,
1837 unsigned long count, int flags);
1838 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1839 ext4_group_t i, struct ext4_group_desc *desc);
1840 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1841 ext4_fsblk_t block, unsigned long count);
1842 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1843
1844 /* inode.c */
1845 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1846 ext4_lblk_t, int, int *);
1847 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1848 ext4_lblk_t, int, int *);
1849 int ext4_get_block(struct inode *inode, sector_t iblock,
1850 struct buffer_head *bh_result, int create);
1851
1852 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1853 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1854 extern int ext4_setattr(struct dentry *, struct iattr *);
1855 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1856 struct kstat *stat);
1857 extern void ext4_evict_inode(struct inode *);
1858 extern void ext4_clear_inode(struct inode *);
1859 extern int ext4_sync_inode(handle_t *, struct inode *);
1860 extern void ext4_dirty_inode(struct inode *, int);
1861 extern int ext4_change_inode_journal_flag(struct inode *, int);
1862 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1863 extern int ext4_can_truncate(struct inode *inode);
1864 extern void ext4_truncate(struct inode *);
1865 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1866 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1867 extern void ext4_set_inode_flags(struct inode *);
1868 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1869 extern int ext4_alloc_da_blocks(struct inode *inode);
1870 extern void ext4_set_aops(struct inode *inode);
1871 extern int ext4_writepage_trans_blocks(struct inode *);
1872 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1873 extern int ext4_block_truncate_page(handle_t *handle,
1874 struct address_space *mapping, loff_t from);
1875 extern int ext4_block_zero_page_range(handle_t *handle,
1876 struct address_space *mapping, loff_t from, loff_t length);
1877 extern int ext4_discard_partial_page_buffers(handle_t *handle,
1878 struct address_space *mapping, loff_t from,
1879 loff_t length, int flags);
1880 extern int ext4_discard_partial_page_buffers_no_lock(handle_t *handle,
1881 struct inode *inode, struct page *page, loff_t from,
1882 loff_t length, int flags);
1883 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1884 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1885 extern void ext4_da_update_reserve_space(struct inode *inode,
1886 int used, int quota_claim);
1887
1888 /* indirect.c */
1889 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1890 struct ext4_map_blocks *map, int flags);
1891 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1892 const struct iovec *iov, loff_t offset,
1893 unsigned long nr_segs);
1894 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1895 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1896 extern void ext4_ind_truncate(struct inode *inode);
1897
1898 /* ioctl.c */
1899 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1900 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1901
1902 /* migrate.c */
1903 extern int ext4_ext_migrate(struct inode *);
1904
1905 /* namei.c */
1906 extern int ext4_orphan_add(handle_t *, struct inode *);
1907 extern int ext4_orphan_del(handle_t *, struct inode *);
1908 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1909 __u32 start_minor_hash, __u32 *next_hash);
1910
1911 /* resize.c */
1912 extern int ext4_group_add(struct super_block *sb,
1913 struct ext4_new_group_data *input);
1914 extern int ext4_group_extend(struct super_block *sb,
1915 struct ext4_super_block *es,
1916 ext4_fsblk_t n_blocks_count);
1917
1918 /* super.c */
1919 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1920 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1921 extern void ext4_kvfree(void *ptr);
1922 extern void __ext4_error(struct super_block *, const char *, unsigned int,
1923 const char *, ...)
1924 __attribute__ ((format (printf, 4, 5)));
1925 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1926 __LINE__, ## message)
1927 extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1928 ext4_fsblk_t, const char *, ...)
1929 __attribute__ ((format (printf, 5, 6)));
1930 extern void ext4_error_file(struct file *, const char *, unsigned int,
1931 ext4_fsblk_t, const char *, ...)
1932 __attribute__ ((format (printf, 5, 6)));
1933 extern void __ext4_std_error(struct super_block *, const char *,
1934 unsigned int, int);
1935 extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1936 const char *, ...)
1937 __attribute__ ((format (printf, 4, 5)));
1938 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1939 __LINE__, ## message)
1940 extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1941 const char *, ...)
1942 __attribute__ ((format (printf, 4, 5)));
1943 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1944 __LINE__, ## message)
1945 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1946 __attribute__ ((format (printf, 3, 4)));
1947 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1948 const char *, unsigned int, const char *);
1949 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
1950 __LINE__, msg)
1951 extern void __ext4_grp_locked_error(const char *, unsigned int, \
1952 struct super_block *, ext4_group_t, \
1953 unsigned long, ext4_fsblk_t, \
1954 const char *, ...)
1955 __attribute__ ((format (printf, 7, 8)));
1956 #define ext4_grp_locked_error(sb, grp, message...) \
1957 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1958 extern void ext4_update_dynamic_rev(struct super_block *sb);
1959 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1960 __u32 compat);
1961 extern int ext4_update_rocompat_feature(handle_t *handle,
1962 struct super_block *sb, __u32 rocompat);
1963 extern int ext4_update_incompat_feature(handle_t *handle,
1964 struct super_block *sb, __u32 incompat);
1965 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1966 struct ext4_group_desc *bg);
1967 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1968 struct ext4_group_desc *bg);
1969 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1970 struct ext4_group_desc *bg);
1971 extern __u32 ext4_free_blks_count(struct super_block *sb,
1972 struct ext4_group_desc *bg);
1973 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1974 struct ext4_group_desc *bg);
1975 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1976 struct ext4_group_desc *bg);
1977 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1978 struct ext4_group_desc *bg);
1979 extern void ext4_block_bitmap_set(struct super_block *sb,
1980 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1981 extern void ext4_inode_bitmap_set(struct super_block *sb,
1982 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1983 extern void ext4_inode_table_set(struct super_block *sb,
1984 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1985 extern void ext4_free_blks_set(struct super_block *sb,
1986 struct ext4_group_desc *bg, __u32 count);
1987 extern void ext4_free_inodes_set(struct super_block *sb,
1988 struct ext4_group_desc *bg, __u32 count);
1989 extern void ext4_used_dirs_set(struct super_block *sb,
1990 struct ext4_group_desc *bg, __u32 count);
1991 extern void ext4_itable_unused_set(struct super_block *sb,
1992 struct ext4_group_desc *bg, __u32 count);
1993 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1994 struct ext4_group_desc *gdp);
1995 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1996 struct ext4_group_desc *gdp);
1997
1998 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1999 {
2000 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2001 le32_to_cpu(es->s_blocks_count_lo);
2002 }
2003
2004 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2005 {
2006 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2007 le32_to_cpu(es->s_r_blocks_count_lo);
2008 }
2009
2010 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2011 {
2012 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2013 le32_to_cpu(es->s_free_blocks_count_lo);
2014 }
2015
2016 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2017 ext4_fsblk_t blk)
2018 {
2019 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2020 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2021 }
2022
2023 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2024 ext4_fsblk_t blk)
2025 {
2026 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2027 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2028 }
2029
2030 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2031 ext4_fsblk_t blk)
2032 {
2033 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2034 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2035 }
2036
2037 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2038 {
2039 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2040 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2041 le32_to_cpu(raw_inode->i_size_lo);
2042 else
2043 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2044 }
2045
2046 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2047 {
2048 raw_inode->i_size_lo = cpu_to_le32(i_size);
2049 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2050 }
2051
2052 static inline
2053 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2054 ext4_group_t group)
2055 {
2056 struct ext4_group_info ***grp_info;
2057 long indexv, indexh;
2058 grp_info = EXT4_SB(sb)->s_group_info;
2059 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2060 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2061 return grp_info[indexv][indexh];
2062 }
2063
2064 /*
2065 * Reading s_groups_count requires using smp_rmb() afterwards. See
2066 * the locking protocol documented in the comments of ext4_group_add()
2067 * in resize.c
2068 */
2069 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2070 {
2071 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2072
2073 smp_rmb();
2074 return ngroups;
2075 }
2076
2077 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2078 ext4_group_t block_group)
2079 {
2080 return block_group >> sbi->s_log_groups_per_flex;
2081 }
2082
2083 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2084 {
2085 return 1 << sbi->s_log_groups_per_flex;
2086 }
2087
2088 #define ext4_std_error(sb, errno) \
2089 do { \
2090 if ((errno)) \
2091 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2092 } while (0)
2093
2094 #ifdef CONFIG_SMP
2095 /* Each CPU can accumulate percpu_counter_batch blocks in their local
2096 * counters. So we need to make sure we have free blocks more
2097 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2098 */
2099 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2100 #else
2101 #define EXT4_FREEBLOCKS_WATERMARK 0
2102 #endif
2103
2104 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2105 {
2106 /*
2107 * XXX: replace with spinlock if seen contended -bzzz
2108 */
2109 down_write(&EXT4_I(inode)->i_data_sem);
2110 if (newsize > EXT4_I(inode)->i_disksize)
2111 EXT4_I(inode)->i_disksize = newsize;
2112 up_write(&EXT4_I(inode)->i_data_sem);
2113 return ;
2114 }
2115
2116 struct ext4_group_info {
2117 unsigned long bb_state;
2118 struct rb_root bb_free_root;
2119 ext4_grpblk_t bb_first_free; /* first free block */
2120 ext4_grpblk_t bb_free; /* total free blocks */
2121 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2122 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2123 struct list_head bb_prealloc_list;
2124 #ifdef DOUBLE_CHECK
2125 void *bb_bitmap;
2126 #endif
2127 struct rw_semaphore alloc_sem;
2128 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2129 * regions, index is order.
2130 * bb_counters[3] = 5 means
2131 * 5 free 8-block regions. */
2132 };
2133
2134 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2135 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2136
2137 #define EXT4_MB_GRP_NEED_INIT(grp) \
2138 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2139
2140 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2141 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2142 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2143 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2144 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2145 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2146
2147 #define EXT4_MAX_CONTENTION 8
2148 #define EXT4_CONTENTION_THRESHOLD 2
2149
2150 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2151 ext4_group_t group)
2152 {
2153 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2154 }
2155
2156 /*
2157 * Returns true if the filesystem is busy enough that attempts to
2158 * access the block group locks has run into contention.
2159 */
2160 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2161 {
2162 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2163 }
2164
2165 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2166 {
2167 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2168 if (spin_trylock(lock))
2169 /*
2170 * We're able to grab the lock right away, so drop the
2171 * lock contention counter.
2172 */
2173 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2174 else {
2175 /*
2176 * The lock is busy, so bump the contention counter,
2177 * and then wait on the spin lock.
2178 */
2179 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2180 EXT4_MAX_CONTENTION);
2181 spin_lock(lock);
2182 }
2183 }
2184
2185 static inline void ext4_unlock_group(struct super_block *sb,
2186 ext4_group_t group)
2187 {
2188 spin_unlock(ext4_group_lock_ptr(sb, group));
2189 }
2190
2191 static inline void ext4_mark_super_dirty(struct super_block *sb)
2192 {
2193 if (EXT4_SB(sb)->s_journal == NULL)
2194 sb->s_dirt =1;
2195 }
2196
2197 /*
2198 * Block validity checking
2199 */
2200 #define ext4_check_indirect_blockref(inode, bh) \
2201 ext4_check_blockref(__func__, __LINE__, inode, \
2202 (__le32 *)(bh)->b_data, \
2203 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2204
2205 #define ext4_ind_check_inode(inode) \
2206 ext4_check_blockref(__func__, __LINE__, inode, \
2207 EXT4_I(inode)->i_data, \
2208 EXT4_NDIR_BLOCKS)
2209
2210 /*
2211 * Inodes and files operations
2212 */
2213
2214 /* dir.c */
2215 extern const struct file_operations ext4_dir_operations;
2216
2217 /* file.c */
2218 extern const struct inode_operations ext4_file_inode_operations;
2219 extern const struct file_operations ext4_file_operations;
2220 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2221
2222 /* namei.c */
2223 extern const struct inode_operations ext4_dir_inode_operations;
2224 extern const struct inode_operations ext4_special_inode_operations;
2225 extern struct dentry *ext4_get_parent(struct dentry *child);
2226
2227 /* symlink.c */
2228 extern const struct inode_operations ext4_symlink_inode_operations;
2229 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2230
2231 /* block_validity */
2232 extern void ext4_release_system_zone(struct super_block *sb);
2233 extern int ext4_setup_system_zone(struct super_block *sb);
2234 extern int __init ext4_init_system_zone(void);
2235 extern void ext4_exit_system_zone(void);
2236 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2237 ext4_fsblk_t start_blk,
2238 unsigned int count);
2239 extern int ext4_check_blockref(const char *, unsigned int,
2240 struct inode *, __le32 *, unsigned int);
2241
2242 /* extents.c */
2243 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2244 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2245 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2246 int chunk);
2247 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2248 struct ext4_map_blocks *map, int flags);
2249 extern void ext4_ext_truncate(struct inode *);
2250 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2251 loff_t length);
2252 extern void ext4_ext_init(struct super_block *);
2253 extern void ext4_ext_release(struct super_block *);
2254 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2255 loff_t len);
2256 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2257 ssize_t len);
2258 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2259 struct ext4_map_blocks *map, int flags);
2260 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2261 __u64 start, __u64 len);
2262 /* move_extent.c */
2263 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2264 __u64 start_orig, __u64 start_donor,
2265 __u64 len, __u64 *moved_len);
2266
2267 /* page-io.c */
2268 extern int __init ext4_init_pageio(void);
2269 extern void ext4_exit_pageio(void);
2270 extern void ext4_ioend_wait(struct inode *);
2271 extern void ext4_free_io_end(ext4_io_end_t *io);
2272 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2273 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2274 extern void ext4_io_submit(struct ext4_io_submit *io);
2275 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2276 struct page *page,
2277 int len,
2278 struct writeback_control *wbc);
2279
2280 /* mmp.c */
2281 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2282
2283 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2284 enum ext4_state_bits {
2285 BH_Uninit /* blocks are allocated but uninitialized on disk */
2286 = BH_JBDPrivateStart,
2287 };
2288
2289 BUFFER_FNS(Uninit, uninit)
2290 TAS_BUFFER_FNS(Uninit, uninit)
2291
2292 /*
2293 * Add new method to test wether block and inode bitmaps are properly
2294 * initialized. With uninit_bg reading the block from disk is not enough
2295 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2296 */
2297 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2298
2299 static inline int bitmap_uptodate(struct buffer_head *bh)
2300 {
2301 return (buffer_uptodate(bh) &&
2302 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2303 }
2304 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2305 {
2306 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2307 }
2308
2309 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2310
2311 /* For ioend & aio unwritten conversion wait queues */
2312 #define EXT4_WQ_HASH_SZ 37
2313 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2314 EXT4_WQ_HASH_SZ])
2315 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2316 EXT4_WQ_HASH_SZ])
2317 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2318 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2319
2320 #define EXT4_RESIZING 0
2321 extern int ext4_resize_begin(struct super_block *sb);
2322 extern void ext4_resize_end(struct super_block *sb);
2323
2324 #endif /* __KERNEL__ */
2325
2326 #endif /* _EXT4_H */
Linux kernel - Deliverables
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