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Add linux-next specific files for 20110831
[linux-2.6/next.git] / fs / ext4 / ext4.h
bloba4171a972ae619abfe257052aeb7f603db79a802
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
179 struct ext4_io_page {
180 struct page *p_page;
181 atomic_t p_count;
182 };
183
184 #define MAX_IO_PAGES 128
185
186 typedef struct ext4_io_end {
187 struct list_head list; /* per-file finished IO list */
188 struct inode *inode; /* file being written to */
189 unsigned int flag; /* unwritten or not */
190 struct page *page; /* page struct for buffer write */
191 loff_t offset; /* offset in the file */
192 ssize_t size; /* size of the extent */
193 struct work_struct work; /* data work queue */
194 struct kiocb *iocb; /* iocb struct for AIO */
195 int result; /* error value for AIO */
196 int num_io_pages;
197 struct ext4_io_page *pages[MAX_IO_PAGES];
198 } ext4_io_end_t;
199
200 struct ext4_io_submit {
201 int io_op;
202 struct bio *io_bio;
203 ext4_io_end_t *io_end;
204 struct ext4_io_page *io_page;
205 sector_t io_next_block;
206 };
207
208 /*
209 * Special inodes numbers
210 */
211 #define EXT4_BAD_INO 1 /* Bad blocks inode */
212 #define EXT4_ROOT_INO 2 /* Root inode */
213 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
214 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
215 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
216 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
217 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
218 #define EXT4_JOURNAL_INO 8 /* Journal inode */
219
220 /* First non-reserved inode for old ext4 filesystems */
221 #define EXT4_GOOD_OLD_FIRST_INO 11
222
223 /*
224 * Maximal count of links to a file
225 */
226 #define EXT4_LINK_MAX 65000
227
228 /*
229 * Macro-instructions used to manage several block sizes
230 */
231 #define EXT4_MIN_BLOCK_SIZE 1024
232 #define EXT4_MAX_BLOCK_SIZE 65536
233 #define EXT4_MIN_BLOCK_LOG_SIZE 10
234 #define EXT4_MAX_BLOCK_LOG_SIZE 16
235 #ifdef __KERNEL__
236 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
237 #else
238 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
239 #endif
240 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
241 #ifdef __KERNEL__
242 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
243 #else
244 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
245 #endif
246 #ifdef __KERNEL__
247 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
248 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
249 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
250 #else
251 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
252 EXT4_GOOD_OLD_INODE_SIZE : \
253 (s)->s_inode_size)
254 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
255 EXT4_GOOD_OLD_FIRST_INO : \
256 (s)->s_first_ino)
257 #endif
258 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
259
260 /*
261 * Structure of a blocks group descriptor
262 */
263 struct ext4_group_desc
264 {
265 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
266 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
267 __le32 bg_inode_table_lo; /* Inodes table block */
268 __le16 bg_free_blocks_count_lo;/* Free blocks count */
269 __le16 bg_free_inodes_count_lo;/* Free inodes count */
270 __le16 bg_used_dirs_count_lo; /* Directories count */
271 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
272 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
273 __le16 bg_itable_unused_lo; /* Unused inodes count */
274 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
275 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
276 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
277 __le32 bg_inode_table_hi; /* Inodes table block MSB */
278 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
279 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
280 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
281 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
282 __u32 bg_reserved2[3];
283 };
284
285 /*
286 * Structure of a flex block group info
287 */
288
289 struct flex_groups {
290 atomic_t free_inodes;
291 atomic_t free_blocks;
292 atomic_t used_dirs;
293 };
294
295 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
296 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
297 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
298
299 /*
300 * Macro-instructions used to manage group descriptors
301 */
302 #define EXT4_MIN_DESC_SIZE 32
303 #define EXT4_MIN_DESC_SIZE_64BIT 64
304 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
305 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
306 #ifdef __KERNEL__
307 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
308 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
309 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
310 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
311 #else
312 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
313 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
314 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
315 #endif
316
317 /*
318 * Constants relative to the data blocks
319 */
320 #define EXT4_NDIR_BLOCKS 12
321 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
322 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
323 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
324 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
325
326 /*
327 * Inode flags
328 */
329 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
330 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
331 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
332 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
333 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
334 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
335 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
336 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
337 /* Reserved for compression usage... */
338 #define EXT4_DIRTY_FL 0x00000100
339 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
340 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
341 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
342 /* End compression flags --- maybe not all used */
343 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
344 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
345 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
346 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
347 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
348 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
349 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
350 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
351 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
352 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
353 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
354
355 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
356 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
357
358 /* Flags that should be inherited by new inodes from their parent. */
359 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
360 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
361 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
362 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
363
364 /* Flags that are appropriate for regular files (all but dir-specific ones). */
365 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
366
367 /* Flags that are appropriate for non-directories/regular files. */
368 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
369
370 /* Mask out flags that are inappropriate for the given type of inode. */
371 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
372 {
373 if (S_ISDIR(mode))
374 return flags;
375 else if (S_ISREG(mode))
376 return flags & EXT4_REG_FLMASK;
377 else
378 return flags & EXT4_OTHER_FLMASK;
379 }
380
381 /*
382 * Inode flags used for atomic set/get
383 */
384 enum {
385 EXT4_INODE_SECRM = 0, /* Secure deletion */
386 EXT4_INODE_UNRM = 1, /* Undelete */
387 EXT4_INODE_COMPR = 2, /* Compress file */
388 EXT4_INODE_SYNC = 3, /* Synchronous updates */
389 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
390 EXT4_INODE_APPEND = 5, /* writes to file may only append */
391 EXT4_INODE_NODUMP = 6, /* do not dump file */
392 EXT4_INODE_NOATIME = 7, /* do not update atime */
393 /* Reserved for compression usage... */
394 EXT4_INODE_DIRTY = 8,
395 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
396 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
397 EXT4_INODE_ECOMPR = 11, /* Compression error */
398 /* End compression flags --- maybe not all used */
399 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
400 EXT4_INODE_IMAGIC = 13, /* AFS directory */
401 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
402 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
403 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
404 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
405 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
406 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
407 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
408 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
409 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
410 };
411
412 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
413 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
414 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
415 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
416
417 /*
418 * Since it's pretty easy to mix up bit numbers and hex values, and we
419 * can't do a compile-time test for ENUM values, we use a run-time
420 * test to make sure that EXT4_XXX_FL is consistent with respect to
421 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
422 * out so it won't cost any extra space in the compiled kernel image.
423 * But it's important that these values are the same, since we are
424 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
425 * must be consistent with the values of FS_XXX_FL defined in
426 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
427 * ext4 filesystems, and of course the values defined in e2fsprogs.
428 *
429 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
430 */
431 static inline void ext4_check_flag_values(void)
432 {
433 CHECK_FLAG_VALUE(SECRM);
434 CHECK_FLAG_VALUE(UNRM);
435 CHECK_FLAG_VALUE(COMPR);
436 CHECK_FLAG_VALUE(SYNC);
437 CHECK_FLAG_VALUE(IMMUTABLE);
438 CHECK_FLAG_VALUE(APPEND);
439 CHECK_FLAG_VALUE(NODUMP);
440 CHECK_FLAG_VALUE(NOATIME);
441 CHECK_FLAG_VALUE(DIRTY);
442 CHECK_FLAG_VALUE(COMPRBLK);
443 CHECK_FLAG_VALUE(NOCOMPR);
444 CHECK_FLAG_VALUE(ECOMPR);
445 CHECK_FLAG_VALUE(INDEX);
446 CHECK_FLAG_VALUE(IMAGIC);
447 CHECK_FLAG_VALUE(JOURNAL_DATA);
448 CHECK_FLAG_VALUE(NOTAIL);
449 CHECK_FLAG_VALUE(DIRSYNC);
450 CHECK_FLAG_VALUE(TOPDIR);
451 CHECK_FLAG_VALUE(HUGE_FILE);
452 CHECK_FLAG_VALUE(EXTENTS);
453 CHECK_FLAG_VALUE(EA_INODE);
454 CHECK_FLAG_VALUE(EOFBLOCKS);
455 CHECK_FLAG_VALUE(RESERVED);
456 }
457
458 /* Used to pass group descriptor data when online resize is done */
459 struct ext4_new_group_input {
460 __u32 group; /* Group number for this data */
461 __u64 block_bitmap; /* Absolute block number of block bitmap */
462 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
463 __u64 inode_table; /* Absolute block number of inode table start */
464 __u32 blocks_count; /* Total number of blocks in this group */
465 __u16 reserved_blocks; /* Number of reserved blocks in this group */
466 __u16 unused;
467 };
468
469 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
470 struct compat_ext4_new_group_input {
471 u32 group;
472 compat_u64 block_bitmap;
473 compat_u64 inode_bitmap;
474 compat_u64 inode_table;
475 u32 blocks_count;
476 u16 reserved_blocks;
477 u16 unused;
478 };
479 #endif
480
481 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
482 struct ext4_new_group_data {
483 __u32 group;
484 __u64 block_bitmap;
485 __u64 inode_bitmap;
486 __u64 inode_table;
487 __u32 blocks_count;
488 __u16 reserved_blocks;
489 __u16 unused;
490 __u32 free_blocks_count;
491 };
492
493 /*
494 * Flags used by ext4_map_blocks()
495 */
496 /* Allocate any needed blocks and/or convert an unitialized
497 extent to be an initialized ext4 */
498 #define EXT4_GET_BLOCKS_CREATE 0x0001
499 /* Request the creation of an unitialized extent */
500 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
501 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
502 EXT4_GET_BLOCKS_CREATE)
503 /* Caller is from the delayed allocation writeout path,
504 so set the magic i_delalloc_reserve_flag after taking the
505 inode allocation semaphore for */
506 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
507 /* caller is from the direct IO path, request to creation of an
508 unitialized extents if not allocated, split the uninitialized
509 extent if blocks has been preallocated already*/
510 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
511 #define EXT4_GET_BLOCKS_CONVERT 0x0010
512 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
513 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
514 /* Convert extent to initialized after IO complete */
515 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
516 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
517 /* Punch out blocks of an extent */
518 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
519 /* Don't normalize allocation size (used for fallocate) */
520 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
521
522 /*
523 * Flags used by ext4_free_blocks
524 */
525 #define EXT4_FREE_BLOCKS_METADATA 0x0001
526 #define EXT4_FREE_BLOCKS_FORGET 0x0002
527 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
528 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
529
530 /*
531 * ioctl commands
532 */
533 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
534 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
535 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
536 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
537 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
538 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
539 #ifdef CONFIG_JBD2_DEBUG
540 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
541 #endif
542 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
543 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
544 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
545 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
546 #define EXT4_IOC_MIGRATE _IO('f', 9)
547 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
548 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
549 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
550 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
551
552 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
553 /*
554 * ioctl commands in 32 bit emulation
555 */
556 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
557 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
558 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
559 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
560 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
561 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
562 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
563 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
564 #ifdef CONFIG_JBD2_DEBUG
565 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
566 #endif
567 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
568 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
569 #endif
570
571 /* Max physical block we can address w/o extents */
572 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
573
574 /*
575 * Structure of an inode on the disk
576 */
577 struct ext4_inode {
578 __le16 i_mode; /* File mode */
579 __le16 i_uid; /* Low 16 bits of Owner Uid */
580 __le32 i_size_lo; /* Size in bytes */
581 __le32 i_atime; /* Access time */
582 __le32 i_ctime; /* Inode Change time */
583 __le32 i_mtime; /* Modification time */
584 __le32 i_dtime; /* Deletion Time */
585 __le16 i_gid; /* Low 16 bits of Group Id */
586 __le16 i_links_count; /* Links count */
587 __le32 i_blocks_lo; /* Blocks count */
588 __le32 i_flags; /* File flags */
589 union {
590 struct {
591 __le32 l_i_version;
592 } linux1;
593 struct {
594 __u32 h_i_translator;
595 } hurd1;
596 struct {
597 __u32 m_i_reserved1;
598 } masix1;
599 } osd1; /* OS dependent 1 */
600 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
601 __le32 i_generation; /* File version (for NFS) */
602 __le32 i_file_acl_lo; /* File ACL */
603 __le32 i_size_high;
604 __le32 i_obso_faddr; /* Obsoleted fragment address */
605 union {
606 struct {
607 __le16 l_i_blocks_high; /* were l_i_reserved1 */
608 __le16 l_i_file_acl_high;
609 __le16 l_i_uid_high; /* these 2 fields */
610 __le16 l_i_gid_high; /* were reserved2[0] */
611 __u32 l_i_reserved2;
612 } linux2;
613 struct {
614 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
615 __u16 h_i_mode_high;
616 __u16 h_i_uid_high;
617 __u16 h_i_gid_high;
618 __u32 h_i_author;
619 } hurd2;
620 struct {
621 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
622 __le16 m_i_file_acl_high;
623 __u32 m_i_reserved2[2];
624 } masix2;
625 } osd2; /* OS dependent 2 */
626 __le16 i_extra_isize;
627 __le16 i_pad1;
628 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
629 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
630 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
631 __le32 i_crtime; /* File Creation time */
632 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
633 __le32 i_version_hi; /* high 32 bits for 64-bit version */
634 };
635
636 struct move_extent {
637 __u32 reserved; /* should be zero */
638 __u32 donor_fd; /* donor file descriptor */
639 __u64 orig_start; /* logical start offset in block for orig */
640 __u64 donor_start; /* logical start offset in block for donor */
641 __u64 len; /* block length to be moved */
642 __u64 moved_len; /* moved block length */
643 };
644
645 #define EXT4_EPOCH_BITS 2
646 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
647 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
648
649 /*
650 * Extended fields will fit into an inode if the filesystem was formatted
651 * with large inodes (-I 256 or larger) and there are not currently any EAs
652 * consuming all of the available space. For new inodes we always reserve
653 * enough space for the kernel's known extended fields, but for inodes
654 * created with an old kernel this might not have been the case. None of
655 * the extended inode fields is critical for correct filesystem operation.
656 * This macro checks if a certain field fits in the inode. Note that
657 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
658 */
659 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
660 ((offsetof(typeof(*ext4_inode), field) + \
661 sizeof((ext4_inode)->field)) \
662 <= (EXT4_GOOD_OLD_INODE_SIZE + \
663 (einode)->i_extra_isize)) \
664
665 static inline __le32 ext4_encode_extra_time(struct timespec *time)
666 {
667 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
668 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
669 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
670 }
671
672 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
673 {
674 if (sizeof(time->tv_sec) > 4)
675 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
676 << 32;
677 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
678 }
679
680 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
681 do { \
682 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
683 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
684 (raw_inode)->xtime ## _extra = \
685 ext4_encode_extra_time(&(inode)->xtime); \
686 } while (0)
687
688 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
689 do { \
690 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
691 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
692 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
693 (raw_inode)->xtime ## _extra = \
694 ext4_encode_extra_time(&(einode)->xtime); \
695 } while (0)
696
697 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
698 do { \
699 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
700 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
701 ext4_decode_extra_time(&(inode)->xtime, \
702 raw_inode->xtime ## _extra); \
703 else \
704 (inode)->xtime.tv_nsec = 0; \
705 } while (0)
706
707 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
708 do { \
709 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
710 (einode)->xtime.tv_sec = \
711 (signed)le32_to_cpu((raw_inode)->xtime); \
712 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
713 ext4_decode_extra_time(&(einode)->xtime, \
714 raw_inode->xtime ## _extra); \
715 else \
716 (einode)->xtime.tv_nsec = 0; \
717 } while (0)
718
719 #define i_disk_version osd1.linux1.l_i_version
720
721 #if defined(__KERNEL__) || defined(__linux__)
722 #define i_reserved1 osd1.linux1.l_i_reserved1
723 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
724 #define i_blocks_high osd2.linux2.l_i_blocks_high
725 #define i_uid_low i_uid
726 #define i_gid_low i_gid
727 #define i_uid_high osd2.linux2.l_i_uid_high
728 #define i_gid_high osd2.linux2.l_i_gid_high
729 #define i_reserved2 osd2.linux2.l_i_reserved2
730
731 #elif defined(__GNU__)
732
733 #define i_translator osd1.hurd1.h_i_translator
734 #define i_uid_high osd2.hurd2.h_i_uid_high
735 #define i_gid_high osd2.hurd2.h_i_gid_high
736 #define i_author osd2.hurd2.h_i_author
737
738 #elif defined(__masix__)
739
740 #define i_reserved1 osd1.masix1.m_i_reserved1
741 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
742 #define i_reserved2 osd2.masix2.m_i_reserved2
743
744 #endif /* defined(__KERNEL__) || defined(__linux__) */
745
746 /*
747 * storage for cached extent
748 * If ec_len == 0, then the cache is invalid.
749 * If ec_start == 0, then the cache represents a gap (null mapping)
750 */
751 struct ext4_ext_cache {
752 ext4_fsblk_t ec_start;
753 ext4_lblk_t ec_block;
754 __u32 ec_len; /* must be 32bit to return holes */
755 };
756
757 /*
758 * fourth extended file system inode data in memory
759 */
760 struct ext4_inode_info {
761 __le32 i_data[15]; /* unconverted */
762 __u32 i_dtime;
763 ext4_fsblk_t i_file_acl;
764
765 /*
766 * i_block_group is the number of the block group which contains
767 * this file's inode. Constant across the lifetime of the inode,
768 * it is ued for making block allocation decisions - we try to
769 * place a file's data blocks near its inode block, and new inodes
770 * near to their parent directory's inode.
771 */
772 ext4_group_t i_block_group;
773 ext4_lblk_t i_dir_start_lookup;
774 #if (BITS_PER_LONG < 64)
775 unsigned long i_state_flags; /* Dynamic state flags */
776 #endif
777 unsigned long i_flags;
778
779 #ifdef CONFIG_EXT4_FS_XATTR
780 /*
781 * Extended attributes can be read independently of the main file
782 * data. Taking i_mutex even when reading would cause contention
783 * between readers of EAs and writers of regular file data, so
784 * instead we synchronize on xattr_sem when reading or changing
785 * EAs.
786 */
787 struct rw_semaphore xattr_sem;
788 #endif
789
790 struct list_head i_orphan; /* unlinked but open inodes */
791
792 /*
793 * i_disksize keeps track of what the inode size is ON DISK, not
794 * in memory. During truncate, i_size is set to the new size by
795 * the VFS prior to calling ext4_truncate(), but the filesystem won't
796 * set i_disksize to 0 until the truncate is actually under way.
797 *
798 * The intent is that i_disksize always represents the blocks which
799 * are used by this file. This allows recovery to restart truncate
800 * on orphans if we crash during truncate. We actually write i_disksize
801 * into the on-disk inode when writing inodes out, instead of i_size.
802 *
803 * The only time when i_disksize and i_size may be different is when
804 * a truncate is in progress. The only things which change i_disksize
805 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
806 */
807 loff_t i_disksize;
808
809 /*
810 * i_data_sem is for serialising ext4_truncate() against
811 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
812 * data tree are chopped off during truncate. We can't do that in
813 * ext4 because whenever we perform intermediate commits during
814 * truncate, the inode and all the metadata blocks *must* be in a
815 * consistent state which allows truncation of the orphans to restart
816 * during recovery. Hence we must fix the get_block-vs-truncate race
817 * by other means, so we have i_data_sem.
818 */
819 struct rw_semaphore i_data_sem;
820 struct inode vfs_inode;
821 struct jbd2_inode *jinode;
822
823 struct ext4_ext_cache i_cached_extent;
824 /*
825 * File creation time. Its function is same as that of
826 * struct timespec i_{a,c,m}time in the generic inode.
827 */
828 struct timespec i_crtime;
829
830 /* mballoc */
831 struct list_head i_prealloc_list;
832 spinlock_t i_prealloc_lock;
833
834 /* ialloc */
835 ext4_group_t i_last_alloc_group;
836
837 /* allocation reservation info for delalloc */
838 unsigned int i_reserved_data_blocks;
839 unsigned int i_reserved_meta_blocks;
840 unsigned int i_allocated_meta_blocks;
841 ext4_lblk_t i_da_metadata_calc_last_lblock;
842 int i_da_metadata_calc_len;
843
844 /* on-disk additional length */
845 __u16 i_extra_isize;
846
847 #ifdef CONFIG_QUOTA
848 /* quota space reservation, managed internally by quota code */
849 qsize_t i_reserved_quota;
850 #endif
851
852 /* completed IOs that might need unwritten extents handling */
853 struct list_head i_completed_io_list;
854 spinlock_t i_completed_io_lock;
855 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
856 /* current io_end structure for async DIO write*/
857 ext4_io_end_t *cur_aio_dio;
858 atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
859
860 spinlock_t i_block_reservation_lock;
861
862 /*
863 * Transactions that contain inode's metadata needed to complete
864 * fsync and fdatasync, respectively.
865 */
866 tid_t i_sync_tid;
867 tid_t i_datasync_tid;
868 };
869
870 /*
871 * File system states
872 */
873 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
874 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
875 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
876
877 /*
878 * Misc. filesystem flags
879 */
880 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
881 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
882 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
883
884 /*
885 * Mount flags
886 */
887 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
888 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
889 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
890 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
891 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
892 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
893 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
894 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
895 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
896 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
897 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
898 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
899 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
900 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
901 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
902 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
903 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
904 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
905 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
906 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
907 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
908 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
909 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
910 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
911 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
912 #define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
913 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
914 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
915 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
916 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
917 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
918
919 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
920 specified delalloc */
921
922 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
923 ~EXT4_MOUNT_##opt
924 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
925 EXT4_MOUNT_##opt
926 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
927 EXT4_MOUNT_##opt)
928
929 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
930 ~EXT4_MOUNT2_##opt
931 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
932 EXT4_MOUNT2_##opt
933 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
934 EXT4_MOUNT2_##opt)
935
936 #define ext4_test_and_set_bit __test_and_set_bit_le
937 #define ext4_set_bit __set_bit_le
938 #define ext4_set_bit_atomic ext2_set_bit_atomic
939 #define ext4_test_and_clear_bit __test_and_clear_bit_le
940 #define ext4_clear_bit __clear_bit_le
941 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
942 #define ext4_test_bit test_bit_le
943 #define ext4_find_next_zero_bit find_next_zero_bit_le
944 #define ext4_find_next_bit find_next_bit_le
945
946 extern void ext4_set_bits(void *bm, int cur, int len);
947
948 /*
949 * Maximal mount counts between two filesystem checks
950 */
951 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
952 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
953
954 /*
955 * Behaviour when detecting errors
956 */
957 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
958 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
959 #define EXT4_ERRORS_PANIC 3 /* Panic */
960 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
961
962 /*
963 * Structure of the super block
964 */
965 struct ext4_super_block {
966 /*00*/ __le32 s_inodes_count; /* Inodes count */
967 __le32 s_blocks_count_lo; /* Blocks count */
968 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
969 __le32 s_free_blocks_count_lo; /* Free blocks count */
970 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
971 __le32 s_first_data_block; /* First Data Block */
972 __le32 s_log_block_size; /* Block size */
973 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
974 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
975 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
976 __le32 s_inodes_per_group; /* # Inodes per group */
977 __le32 s_mtime; /* Mount time */
978 /*30*/ __le32 s_wtime; /* Write time */
979 __le16 s_mnt_count; /* Mount count */
980 __le16 s_max_mnt_count; /* Maximal mount count */
981 __le16 s_magic; /* Magic signature */
982 __le16 s_state; /* File system state */
983 __le16 s_errors; /* Behaviour when detecting errors */
984 __le16 s_minor_rev_level; /* minor revision level */
985 /*40*/ __le32 s_lastcheck; /* time of last check */
986 __le32 s_checkinterval; /* max. time between checks */
987 __le32 s_creator_os; /* OS */
988 __le32 s_rev_level; /* Revision level */
989 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
990 __le16 s_def_resgid; /* Default gid for reserved blocks */
991 /*
992 * These fields are for EXT4_DYNAMIC_REV superblocks only.
993 *
994 * Note: the difference between the compatible feature set and
995 * the incompatible feature set is that if there is a bit set
996 * in the incompatible feature set that the kernel doesn't
997 * know about, it should refuse to mount the filesystem.
998 *
999 * e2fsck's requirements are more strict; if it doesn't know
1000 * about a feature in either the compatible or incompatible
1001 * feature set, it must abort and not try to meddle with
1002 * things it doesn't understand...
1003 */
1004 __le32 s_first_ino; /* First non-reserved inode */
1005 __le16 s_inode_size; /* size of inode structure */
1006 __le16 s_block_group_nr; /* block group # of this superblock */
1007 __le32 s_feature_compat; /* compatible feature set */
1008 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1009 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1010 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1011 /*78*/ char s_volume_name[16]; /* volume name */
1012 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1013 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1014 /*
1015 * Performance hints. Directory preallocation should only
1016 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1017 */
1018 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1019 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1020 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1021 /*
1022 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1023 */
1024 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1025 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1026 __le32 s_journal_dev; /* device number of journal file */
1027 __le32 s_last_orphan; /* start of list of inodes to delete */
1028 __le32 s_hash_seed[4]; /* HTREE hash seed */
1029 __u8 s_def_hash_version; /* Default hash version to use */
1030 __u8 s_jnl_backup_type;
1031 __le16 s_desc_size; /* size of group descriptor */
1032 /*100*/ __le32 s_default_mount_opts;
1033 __le32 s_first_meta_bg; /* First metablock block group */
1034 __le32 s_mkfs_time; /* When the filesystem was created */
1035 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1036 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1037 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1038 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1039 __le32 s_free_blocks_count_hi; /* Free blocks count */
1040 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1041 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1042 __le32 s_flags; /* Miscellaneous flags */
1043 __le16 s_raid_stride; /* RAID stride */
1044 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1045 __le64 s_mmp_block; /* Block for multi-mount protection */
1046 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1047 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1048 __u8 s_reserved_char_pad;
1049 __le16 s_reserved_pad;
1050 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1051 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1052 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1053 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1054 snapshot's future use */
1055 __le32 s_snapshot_list; /* inode number of the head of the
1056 on-disk snapshot list */
1057 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1058 __le32 s_error_count; /* number of fs errors */
1059 __le32 s_first_error_time; /* first time an error happened */
1060 __le32 s_first_error_ino; /* inode involved in first error */
1061 __le64 s_first_error_block; /* block involved of first error */
1062 __u8 s_first_error_func[32]; /* function where the error happened */
1063 __le32 s_first_error_line; /* line number where error happened */
1064 __le32 s_last_error_time; /* most recent time of an error */
1065 __le32 s_last_error_ino; /* inode involved in last error */
1066 __le32 s_last_error_line; /* line number where error happened */
1067 __le64 s_last_error_block; /* block involved of last error */
1068 __u8 s_last_error_func[32]; /* function where the error happened */
1069 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1070 __u8 s_mount_opts[64];
1071 __le32 s_reserved[112]; /* Padding to the end of the block */
1072 };
1073
1074 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1075
1076 #ifdef __KERNEL__
1077
1078 /*
1079 * run-time mount flags
1080 */
1081 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1082 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1083
1084 /*
1085 * fourth extended-fs super-block data in memory
1086 */
1087 struct ext4_sb_info {
1088 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1089 unsigned long s_inodes_per_block;/* Number of inodes per block */
1090 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1091 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1092 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1093 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1094 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1095 ext4_group_t s_groups_count; /* Number of groups in the fs */
1096 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1097 unsigned long s_overhead_last; /* Last calculated overhead */
1098 unsigned long s_blocks_last; /* Last seen block count */
1099 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1100 struct buffer_head * s_sbh; /* Buffer containing the super block */
1101 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1102 struct buffer_head **s_group_desc;
1103 unsigned int s_mount_opt;
1104 unsigned int s_mount_opt2;
1105 unsigned int s_mount_flags;
1106 ext4_fsblk_t s_sb_block;
1107 uid_t s_resuid;
1108 gid_t s_resgid;
1109 unsigned short s_mount_state;
1110 unsigned short s_pad;
1111 int s_addr_per_block_bits;
1112 int s_desc_per_block_bits;
1113 int s_inode_size;
1114 int s_first_ino;
1115 unsigned int s_inode_readahead_blks;
1116 unsigned int s_inode_goal;
1117 spinlock_t s_next_gen_lock;
1118 u32 s_next_generation;
1119 u32 s_hash_seed[4];
1120 int s_def_hash_version;
1121 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1122 struct percpu_counter s_freeblocks_counter;
1123 struct percpu_counter s_freeinodes_counter;
1124 struct percpu_counter s_dirs_counter;
1125 struct percpu_counter s_dirtyblocks_counter;
1126 struct blockgroup_lock *s_blockgroup_lock;
1127 struct proc_dir_entry *s_proc;
1128 struct kobject s_kobj;
1129 struct completion s_kobj_unregister;
1130
1131 /* Journaling */
1132 struct journal_s *s_journal;
1133 struct list_head s_orphan;
1134 struct mutex s_orphan_lock;
1135 unsigned long s_resize_flags; /* Flags indicating if there
1136 is a resizer */
1137 unsigned long s_commit_interval;
1138 u32 s_max_batch_time;
1139 u32 s_min_batch_time;
1140 struct block_device *journal_bdev;
1141 #ifdef CONFIG_JBD2_DEBUG
1142 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1143 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1144 #endif
1145 #ifdef CONFIG_QUOTA
1146 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1147 int s_jquota_fmt; /* Format of quota to use */
1148 #endif
1149 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1150 struct rb_root system_blks;
1151
1152 #ifdef EXTENTS_STATS
1153 /* ext4 extents stats */
1154 unsigned long s_ext_min;
1155 unsigned long s_ext_max;
1156 unsigned long s_depth_max;
1157 spinlock_t s_ext_stats_lock;
1158 unsigned long s_ext_blocks;
1159 unsigned long s_ext_extents;
1160 #endif
1161 /* ext4 extent cache stats */
1162 unsigned long extent_cache_hits;
1163 unsigned long extent_cache_misses;
1164
1165 /* for buddy allocator */
1166 struct ext4_group_info ***s_group_info;
1167 struct inode *s_buddy_cache;
1168 spinlock_t s_md_lock;
1169 unsigned short *s_mb_offsets;
1170 unsigned int *s_mb_maxs;
1171
1172 /* tunables */
1173 unsigned long s_stripe;
1174 unsigned int s_mb_stream_request;
1175 unsigned int s_mb_max_to_scan;
1176 unsigned int s_mb_min_to_scan;
1177 unsigned int s_mb_stats;
1178 unsigned int s_mb_order2_reqs;
1179 unsigned int s_mb_group_prealloc;
1180 unsigned int s_max_writeback_mb_bump;
1181 /* where last allocation was done - for stream allocation */
1182 unsigned long s_mb_last_group;
1183 unsigned long s_mb_last_start;
1184
1185 /* stats for buddy allocator */
1186 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1187 atomic_t s_bal_success; /* we found long enough chunks */
1188 atomic_t s_bal_allocated; /* in blocks */
1189 atomic_t s_bal_ex_scanned; /* total extents scanned */
1190 atomic_t s_bal_goals; /* goal hits */
1191 atomic_t s_bal_breaks; /* too long searches */
1192 atomic_t s_bal_2orders; /* 2^order hits */
1193 spinlock_t s_bal_lock;
1194 unsigned long s_mb_buddies_generated;
1195 unsigned long long s_mb_generation_time;
1196 atomic_t s_mb_lost_chunks;
1197 atomic_t s_mb_preallocated;
1198 atomic_t s_mb_discarded;
1199 atomic_t s_lock_busy;
1200
1201 /* locality groups */
1202 struct ext4_locality_group __percpu *s_locality_groups;
1203
1204 /* for write statistics */
1205 unsigned long s_sectors_written_start;
1206 u64 s_kbytes_written;
1207
1208 unsigned int s_log_groups_per_flex;
1209 struct flex_groups *s_flex_groups;
1210
1211 /* workqueue for dio unwritten */
1212 struct workqueue_struct *dio_unwritten_wq;
1213
1214 /* timer for periodic error stats printing */
1215 struct timer_list s_err_report;
1216
1217 /* Lazy inode table initialization info */
1218 struct ext4_li_request *s_li_request;
1219 /* Wait multiplier for lazy initialization thread */
1220 unsigned int s_li_wait_mult;
1221
1222 /* Kernel thread for multiple mount protection */
1223 struct task_struct *s_mmp_tsk;
1224
1225 /* record the last minlen when FITRIM is called. */
1226 atomic_t s_last_trim_minblks;
1227 };
1228
1229 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1230 {
1231 return sb->s_fs_info;
1232 }
1233 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1234 {
1235 return container_of(inode, struct ext4_inode_info, vfs_inode);
1236 }
1237
1238 static inline struct timespec ext4_current_time(struct inode *inode)
1239 {
1240 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1241 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1242 }
1243
1244 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1245 {
1246 return ino == EXT4_ROOT_INO ||
1247 ino == EXT4_JOURNAL_INO ||
1248 ino == EXT4_RESIZE_INO ||
1249 (ino >= EXT4_FIRST_INO(sb) &&
1250 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1251 }
1252
1253 /*
1254 * Inode dynamic state flags
1255 */
1256 enum {
1257 EXT4_STATE_JDATA, /* journaled data exists */
1258 EXT4_STATE_NEW, /* inode is newly created */
1259 EXT4_STATE_XATTR, /* has in-inode xattrs */
1260 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1261 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1262 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1263 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1264 EXT4_STATE_NEWENTRY, /* File just added to dir */
1265 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1266 };
1267
1268 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1269 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1270 { \
1271 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1272 } \
1273 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1274 { \
1275 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1276 } \
1277 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1278 { \
1279 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1280 }
1281
1282 EXT4_INODE_BIT_FNS(flag, flags, 0)
1283 #if (BITS_PER_LONG < 64)
1284 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1285
1286 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1287 {
1288 (ei)->i_state_flags = 0;
1289 }
1290 #else
1291 EXT4_INODE_BIT_FNS(state, flags, 32)
1292
1293 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1294 {
1295 /* We depend on the fact that callers will set i_flags */
1296 }
1297 #endif
1298 #else
1299 /* Assume that user mode programs are passing in an ext4fs superblock, not
1300 * a kernel struct super_block. This will allow us to call the feature-test
1301 * macros from user land. */
1302 #define EXT4_SB(sb) (sb)
1303 #endif
1304
1305 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1306
1307 /*
1308 * Codes for operating systems
1309 */
1310 #define EXT4_OS_LINUX 0
1311 #define EXT4_OS_HURD 1
1312 #define EXT4_OS_MASIX 2
1313 #define EXT4_OS_FREEBSD 3
1314 #define EXT4_OS_LITES 4
1315
1316 /*
1317 * Revision levels
1318 */
1319 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1320 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1321
1322 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1323 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1324
1325 #define EXT4_GOOD_OLD_INODE_SIZE 128
1326
1327 /*
1328 * Feature set definitions
1329 */
1330
1331 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1332 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1333 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1334 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1335 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1336 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1337 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1338 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1339 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1340 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1341 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1342 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1343 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1344 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1345 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1346 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1347 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1348 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1349
1350 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1351 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1352 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1353 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1354 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1355 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1356
1357 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1358 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1359 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1360 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1361 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1362 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1363 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1364 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1365
1366 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1367 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1368 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1369 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1370 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1371 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1372 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1373 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1374 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1375 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1376 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1377
1378 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1379 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1380 EXT4_FEATURE_INCOMPAT_META_BG)
1381 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1382 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1383 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1384
1385 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1386 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1387 EXT4_FEATURE_INCOMPAT_RECOVER| \
1388 EXT4_FEATURE_INCOMPAT_META_BG)
1389 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1390 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1391 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1392
1393 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1394 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1395 EXT4_FEATURE_INCOMPAT_RECOVER| \
1396 EXT4_FEATURE_INCOMPAT_META_BG| \
1397 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1398 EXT4_FEATURE_INCOMPAT_64BIT| \
1399 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1400 EXT4_FEATURE_INCOMPAT_MMP)
1401 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1402 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1403 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1404 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1405 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1406 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1407 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1408
1409 /*
1410 * Default values for user and/or group using reserved blocks
1411 */
1412 #define EXT4_DEF_RESUID 0
1413 #define EXT4_DEF_RESGID 0
1414
1415 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1416
1417 /*
1418 * Default mount options
1419 */
1420 #define EXT4_DEFM_DEBUG 0x0001
1421 #define EXT4_DEFM_BSDGROUPS 0x0002
1422 #define EXT4_DEFM_XATTR_USER 0x0004
1423 #define EXT4_DEFM_ACL 0x0008
1424 #define EXT4_DEFM_UID16 0x0010
1425 #define EXT4_DEFM_JMODE 0x0060
1426 #define EXT4_DEFM_JMODE_DATA 0x0020
1427 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1428 #define EXT4_DEFM_JMODE_WBACK 0x0060
1429 #define EXT4_DEFM_NOBARRIER 0x0100
1430 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1431 #define EXT4_DEFM_DISCARD 0x0400
1432 #define EXT4_DEFM_NODELALLOC 0x0800
1433
1434 /*
1435 * Default journal batch times
1436 */
1437 #define EXT4_DEF_MIN_BATCH_TIME 0
1438 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1439
1440 /*
1441 * Minimum number of groups in a flexgroup before we separate out
1442 * directories into the first block group of a flexgroup
1443 */
1444 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1445
1446 /*
1447 * Structure of a directory entry
1448 */
1449 #define EXT4_NAME_LEN 255
1450
1451 struct ext4_dir_entry {
1452 __le32 inode; /* Inode number */
1453 __le16 rec_len; /* Directory entry length */
1454 __le16 name_len; /* Name length */
1455 char name[EXT4_NAME_LEN]; /* File name */
1456 };
1457
1458 /*
1459 * The new version of the directory entry. Since EXT4 structures are
1460 * stored in intel byte order, and the name_len field could never be
1461 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1462 * file_type field.
1463 */
1464 struct ext4_dir_entry_2 {
1465 __le32 inode; /* Inode number */
1466 __le16 rec_len; /* Directory entry length */
1467 __u8 name_len; /* Name length */
1468 __u8 file_type;
1469 char name[EXT4_NAME_LEN]; /* File name */
1470 };
1471
1472 /*
1473 * Ext4 directory file types. Only the low 3 bits are used. The
1474 * other bits are reserved for now.
1475 */
1476 #define EXT4_FT_UNKNOWN 0
1477 #define EXT4_FT_REG_FILE 1
1478 #define EXT4_FT_DIR 2
1479 #define EXT4_FT_CHRDEV 3
1480 #define EXT4_FT_BLKDEV 4
1481 #define EXT4_FT_FIFO 5
1482 #define EXT4_FT_SOCK 6
1483 #define EXT4_FT_SYMLINK 7
1484
1485 #define EXT4_FT_MAX 8
1486
1487 /*
1488 * EXT4_DIR_PAD defines the directory entries boundaries
1489 *
1490 * NOTE: It must be a multiple of 4
1491 */
1492 #define EXT4_DIR_PAD 4
1493 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1494 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1495 ~EXT4_DIR_ROUND)
1496 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1497
1498 /*
1499 * If we ever get support for fs block sizes > page_size, we'll need
1500 * to remove the #if statements in the next two functions...
1501 */
1502 static inline unsigned int
1503 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1504 {
1505 unsigned len = le16_to_cpu(dlen);
1506
1507 #if (PAGE_CACHE_SIZE >= 65536)
1508 if (len == EXT4_MAX_REC_LEN || len == 0)
1509 return blocksize;
1510 return (len & 65532) | ((len & 3) << 16);
1511 #else
1512 return len;
1513 #endif
1514 }
1515
1516 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1517 {
1518 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1519 BUG();
1520 #if (PAGE_CACHE_SIZE >= 65536)
1521 if (len < 65536)
1522 return cpu_to_le16(len);
1523 if (len == blocksize) {
1524 if (blocksize == 65536)
1525 return cpu_to_le16(EXT4_MAX_REC_LEN);
1526 else
1527 return cpu_to_le16(0);
1528 }
1529 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1530 #else
1531 return cpu_to_le16(len);
1532 #endif
1533 }
1534
1535 /*
1536 * Hash Tree Directory indexing
1537 * (c) Daniel Phillips, 2001
1538 */
1539
1540 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1541 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1542 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1543 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1544 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1545
1546 /* Legal values for the dx_root hash_version field: */
1547
1548 #define DX_HASH_LEGACY 0
1549 #define DX_HASH_HALF_MD4 1
1550 #define DX_HASH_TEA 2
1551 #define DX_HASH_LEGACY_UNSIGNED 3
1552 #define DX_HASH_HALF_MD4_UNSIGNED 4
1553 #define DX_HASH_TEA_UNSIGNED 5
1554
1555 #ifdef __KERNEL__
1556
1557 /* hash info structure used by the directory hash */
1558 struct dx_hash_info
1559 {
1560 u32 hash;
1561 u32 minor_hash;
1562 int hash_version;
1563 u32 *seed;
1564 };
1565
1566 #define EXT4_HTREE_EOF 0x7fffffff
1567
1568 /*
1569 * Control parameters used by ext4_htree_next_block
1570 */
1571 #define HASH_NB_ALWAYS 1
1572
1573
1574 /*
1575 * Describe an inode's exact location on disk and in memory
1576 */
1577 struct ext4_iloc
1578 {
1579 struct buffer_head *bh;
1580 unsigned long offset;
1581 ext4_group_t block_group;
1582 };
1583
1584 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1585 {
1586 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1587 }
1588
1589 /*
1590 * This structure is stuffed into the struct file's private_data field
1591 * for directories. It is where we put information so that we can do
1592 * readdir operations in hash tree order.
1593 */
1594 struct dir_private_info {
1595 struct rb_root root;
1596 struct rb_node *curr_node;
1597 struct fname *extra_fname;
1598 loff_t last_pos;
1599 __u32 curr_hash;
1600 __u32 curr_minor_hash;
1601 __u32 next_hash;
1602 };
1603
1604 /* calculate the first block number of the group */
1605 static inline ext4_fsblk_t
1606 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1607 {
1608 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1609 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1610 }
1611
1612 /*
1613 * Special error return code only used by dx_probe() and its callers.
1614 */
1615 #define ERR_BAD_DX_DIR -75000
1616
1617 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1618 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1619
1620 /*
1621 * Timeout and state flag for lazy initialization inode thread.
1622 */
1623 #define EXT4_DEF_LI_WAIT_MULT 10
1624 #define EXT4_DEF_LI_MAX_START_DELAY 5
1625 #define EXT4_LAZYINIT_QUIT 0x0001
1626 #define EXT4_LAZYINIT_RUNNING 0x0002
1627
1628 /*
1629 * Lazy inode table initialization info
1630 */
1631 struct ext4_lazy_init {
1632 unsigned long li_state;
1633 struct list_head li_request_list;
1634 struct mutex li_list_mtx;
1635 };
1636
1637 struct ext4_li_request {
1638 struct super_block *lr_super;
1639 struct ext4_sb_info *lr_sbi;
1640 ext4_group_t lr_next_group;
1641 struct list_head lr_request;
1642 unsigned long lr_next_sched;
1643 unsigned long lr_timeout;
1644 };
1645
1646 struct ext4_features {
1647 struct kobject f_kobj;
1648 struct completion f_kobj_unregister;
1649 };
1650
1651 /*
1652 * This structure will be used for multiple mount protection. It will be
1653 * written into the block number saved in the s_mmp_block field in the
1654 * superblock. Programs that check MMP should assume that if
1655 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1656 * to use the filesystem, regardless of how old the timestamp is.
1657 */
1658 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1659 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1660 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1661 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1662
1663 struct mmp_struct {
1664 __le32 mmp_magic; /* Magic number for MMP */
1665 __le32 mmp_seq; /* Sequence no. updated periodically */
1666
1667 /*
1668 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1669 * purposes and do not affect the correctness of the algorithm
1670 */
1671 __le64 mmp_time; /* Time last updated */
1672 char mmp_nodename[64]; /* Node which last updated MMP block */
1673 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1674
1675 /*
1676 * mmp_check_interval is used to verify if the MMP block has been
1677 * updated on the block device. The value is updated based on the
1678 * maximum time to write the MMP block during an update cycle.
1679 */
1680 __le16 mmp_check_interval;
1681
1682 __le16 mmp_pad1;
1683 __le32 mmp_pad2[227];
1684 };
1685
1686 /* arguments passed to the mmp thread */
1687 struct mmpd_data {
1688 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1689 struct super_block *sb; /* super block of the fs */
1690 };
1691
1692 /*
1693 * Check interval multiplier
1694 * The MMP block is written every update interval and initially checked every
1695 * update interval x the multiplier (the value is then adapted based on the
1696 * write latency). The reason is that writes can be delayed under load and we
1697 * don't want readers to incorrectly assume that the filesystem is no longer
1698 * in use.
1699 */
1700 #define EXT4_MMP_CHECK_MULT 2UL
1701
1702 /*
1703 * Minimum interval for MMP checking in seconds.
1704 */
1705 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1706
1707 /*
1708 * Maximum interval for MMP checking in seconds.
1709 */
1710 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1711
1712 /*
1713 * Function prototypes
1714 */
1715
1716 /*
1717 * Ok, these declarations are also in <linux/kernel.h> but none of the
1718 * ext4 source programs needs to include it so they are duplicated here.
1719 */
1720 # define NORET_TYPE /**/
1721 # define ATTRIB_NORET __attribute__((noreturn))
1722 # define NORET_AND noreturn,
1723
1724 /* bitmap.c */
1725 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1726
1727 /* balloc.c */
1728 extern unsigned int ext4_block_group(struct super_block *sb,
1729 ext4_fsblk_t blocknr);
1730 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1731 ext4_fsblk_t blocknr);
1732 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1733 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1734 ext4_group_t group);
1735 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1736 ext4_fsblk_t goal,
1737 unsigned int flags,
1738 unsigned long *count,
1739 int *errp);
1740 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
1741 s64 nblocks, unsigned int flags);
1742 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1743 extern void ext4_check_blocks_bitmap(struct super_block *);
1744 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1745 ext4_group_t block_group,
1746 struct buffer_head ** bh);
1747 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1748 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1749 ext4_group_t block_group);
1750 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1751 struct buffer_head *bh,
1752 ext4_group_t group,
1753 struct ext4_group_desc *desc);
1754 #define ext4_free_blocks_after_init(sb, group, desc) \
1755 ext4_init_block_bitmap(sb, NULL, group, desc)
1756 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1757
1758 /* dir.c */
1759 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1760 struct file *,
1761 struct ext4_dir_entry_2 *,
1762 struct buffer_head *, unsigned int);
1763 #define ext4_check_dir_entry(dir, filp, de, bh, offset) \
1764 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1765 (de), (bh), (offset)))
1766 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1767 __u32 minor_hash,
1768 struct ext4_dir_entry_2 *dirent);
1769 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1770
1771 /* fsync.c */
1772 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
1773 extern int ext4_flush_completed_IO(struct inode *);
1774
1775 /* hash.c */
1776 extern int ext4fs_dirhash(const char *name, int len, struct
1777 dx_hash_info *hinfo);
1778
1779 /* ialloc.c */
1780 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1781 const struct qstr *qstr, __u32 goal);
1782 extern void ext4_free_inode(handle_t *, struct inode *);
1783 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1784 extern unsigned long ext4_count_free_inodes(struct super_block *);
1785 extern unsigned long ext4_count_dirs(struct super_block *);
1786 extern void ext4_check_inodes_bitmap(struct super_block *);
1787 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1788 extern int ext4_init_inode_table(struct super_block *sb,
1789 ext4_group_t group, int barrier);
1790
1791 /* mballoc.c */
1792 extern long ext4_mb_stats;
1793 extern long ext4_mb_max_to_scan;
1794 extern int ext4_mb_init(struct super_block *, int);
1795 extern int ext4_mb_release(struct super_block *);
1796 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1797 struct ext4_allocation_request *, int *);
1798 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1799 extern void ext4_discard_preallocations(struct inode *);
1800 extern int __init ext4_init_mballoc(void);
1801 extern void ext4_exit_mballoc(void);
1802 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1803 struct buffer_head *bh, ext4_fsblk_t block,
1804 unsigned long count, int flags);
1805 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1806 ext4_group_t i, struct ext4_group_desc *desc);
1807 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
1808 ext4_fsblk_t block, unsigned long count);
1809 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1810
1811 /* inode.c */
1812 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1813 ext4_lblk_t, int, int *);
1814 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1815 ext4_lblk_t, int, int *);
1816 int ext4_get_block(struct inode *inode, sector_t iblock,
1817 struct buffer_head *bh_result, int create);
1818
1819 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1820 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1821 extern int ext4_setattr(struct dentry *, struct iattr *);
1822 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1823 struct kstat *stat);
1824 extern void ext4_evict_inode(struct inode *);
1825 extern void ext4_clear_inode(struct inode *);
1826 extern int ext4_sync_inode(handle_t *, struct inode *);
1827 extern void ext4_dirty_inode(struct inode *, int);
1828 extern int ext4_change_inode_journal_flag(struct inode *, int);
1829 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1830 extern int ext4_can_truncate(struct inode *inode);
1831 extern void ext4_truncate(struct inode *);
1832 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
1833 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1834 extern void ext4_set_inode_flags(struct inode *);
1835 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1836 extern int ext4_alloc_da_blocks(struct inode *inode);
1837 extern void ext4_set_aops(struct inode *inode);
1838 extern int ext4_writepage_trans_blocks(struct inode *);
1839 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1840 extern int ext4_block_truncate_page(handle_t *handle,
1841 struct address_space *mapping, loff_t from);
1842 extern int ext4_block_zero_page_range(handle_t *handle,
1843 struct address_space *mapping, loff_t from, loff_t length);
1844 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1845 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1846 extern void ext4_da_update_reserve_space(struct inode *inode,
1847 int used, int quota_claim);
1848
1849 /* indirect.c */
1850 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
1851 struct ext4_map_blocks *map, int flags);
1852 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
1853 const struct iovec *iov, loff_t offset,
1854 unsigned long nr_segs);
1855 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
1856 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
1857 extern void ext4_ind_truncate(struct inode *inode);
1858
1859 /* ioctl.c */
1860 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1861 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1862
1863 /* migrate.c */
1864 extern int ext4_ext_migrate(struct inode *);
1865
1866 /* namei.c */
1867 extern int ext4_orphan_add(handle_t *, struct inode *);
1868 extern int ext4_orphan_del(handle_t *, struct inode *);
1869 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1870 __u32 start_minor_hash, __u32 *next_hash);
1871
1872 /* resize.c */
1873 extern int ext4_group_add(struct super_block *sb,
1874 struct ext4_new_group_data *input);
1875 extern int ext4_group_extend(struct super_block *sb,
1876 struct ext4_super_block *es,
1877 ext4_fsblk_t n_blocks_count);
1878
1879 /* super.c */
1880 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
1881 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
1882 extern void ext4_kvfree(void *ptr);
1883 extern void __ext4_error(struct super_block *, const char *, unsigned int,
1884 const char *, ...)
1885 __attribute__ ((format (printf, 4, 5)));
1886 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1887 __LINE__, ## message)
1888 extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1889 ext4_fsblk_t, const char *, ...)
1890 __attribute__ ((format (printf, 5, 6)));
1891 extern void ext4_error_file(struct file *, const char *, unsigned int,
1892 ext4_fsblk_t, const char *, ...)
1893 __attribute__ ((format (printf, 5, 6)));
1894 extern void __ext4_std_error(struct super_block *, const char *,
1895 unsigned int, int);
1896 extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1897 const char *, ...)
1898 __attribute__ ((format (printf, 4, 5)));
1899 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1900 __LINE__, ## message)
1901 extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1902 const char *, ...)
1903 __attribute__ ((format (printf, 4, 5)));
1904 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1905 __LINE__, ## message)
1906 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1907 __attribute__ ((format (printf, 3, 4)));
1908 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
1909 const char *, unsigned int, const char *);
1910 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
1911 __LINE__, msg)
1912 extern void __ext4_grp_locked_error(const char *, unsigned int, \
1913 struct super_block *, ext4_group_t, \
1914 unsigned long, ext4_fsblk_t, \
1915 const char *, ...)
1916 __attribute__ ((format (printf, 7, 8)));
1917 #define ext4_grp_locked_error(sb, grp, message...) \
1918 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1919 extern void ext4_update_dynamic_rev(struct super_block *sb);
1920 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1921 __u32 compat);
1922 extern int ext4_update_rocompat_feature(handle_t *handle,
1923 struct super_block *sb, __u32 rocompat);
1924 extern int ext4_update_incompat_feature(handle_t *handle,
1925 struct super_block *sb, __u32 incompat);
1926 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1927 struct ext4_group_desc *bg);
1928 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1929 struct ext4_group_desc *bg);
1930 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1931 struct ext4_group_desc *bg);
1932 extern __u32 ext4_free_blks_count(struct super_block *sb,
1933 struct ext4_group_desc *bg);
1934 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1935 struct ext4_group_desc *bg);
1936 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1937 struct ext4_group_desc *bg);
1938 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1939 struct ext4_group_desc *bg);
1940 extern void ext4_block_bitmap_set(struct super_block *sb,
1941 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1942 extern void ext4_inode_bitmap_set(struct super_block *sb,
1943 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1944 extern void ext4_inode_table_set(struct super_block *sb,
1945 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1946 extern void ext4_free_blks_set(struct super_block *sb,
1947 struct ext4_group_desc *bg, __u32 count);
1948 extern void ext4_free_inodes_set(struct super_block *sb,
1949 struct ext4_group_desc *bg, __u32 count);
1950 extern void ext4_used_dirs_set(struct super_block *sb,
1951 struct ext4_group_desc *bg, __u32 count);
1952 extern void ext4_itable_unused_set(struct super_block *sb,
1953 struct ext4_group_desc *bg, __u32 count);
1954 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1955 struct ext4_group_desc *gdp);
1956 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1957 struct ext4_group_desc *gdp);
1958
1959 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1960 {
1961 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1962 le32_to_cpu(es->s_blocks_count_lo);
1963 }
1964
1965 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1966 {
1967 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1968 le32_to_cpu(es->s_r_blocks_count_lo);
1969 }
1970
1971 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1972 {
1973 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1974 le32_to_cpu(es->s_free_blocks_count_lo);
1975 }
1976
1977 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1978 ext4_fsblk_t blk)
1979 {
1980 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1981 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1982 }
1983
1984 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1985 ext4_fsblk_t blk)
1986 {
1987 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1988 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1989 }
1990
1991 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1992 ext4_fsblk_t blk)
1993 {
1994 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1995 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1996 }
1997
1998 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1999 {
2000 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2001 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2002 le32_to_cpu(raw_inode->i_size_lo);
2003 else
2004 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2005 }
2006
2007 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2008 {
2009 raw_inode->i_size_lo = cpu_to_le32(i_size);
2010 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2011 }
2012
2013 static inline
2014 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2015 ext4_group_t group)
2016 {
2017 struct ext4_group_info ***grp_info;
2018 long indexv, indexh;
2019 grp_info = EXT4_SB(sb)->s_group_info;
2020 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2021 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2022 return grp_info[indexv][indexh];
2023 }
2024
2025 /*
2026 * Reading s_groups_count requires using smp_rmb() afterwards. See
2027 * the locking protocol documented in the comments of ext4_group_add()
2028 * in resize.c
2029 */
2030 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2031 {
2032 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2033
2034 smp_rmb();
2035 return ngroups;
2036 }
2037
2038 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2039 ext4_group_t block_group)
2040 {
2041 return block_group >> sbi->s_log_groups_per_flex;
2042 }
2043
2044 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2045 {
2046 return 1 << sbi->s_log_groups_per_flex;
2047 }
2048
2049 #define ext4_std_error(sb, errno) \
2050 do { \
2051 if ((errno)) \
2052 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2053 } while (0)
2054
2055 #ifdef CONFIG_SMP
2056 /* Each CPU can accumulate percpu_counter_batch blocks in their local
2057 * counters. So we need to make sure we have free blocks more
2058 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2059 */
2060 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2061 #else
2062 #define EXT4_FREEBLOCKS_WATERMARK 0
2063 #endif
2064
2065 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2066 {
2067 /*
2068 * XXX: replace with spinlock if seen contended -bzzz
2069 */
2070 down_write(&EXT4_I(inode)->i_data_sem);
2071 if (newsize > EXT4_I(inode)->i_disksize)
2072 EXT4_I(inode)->i_disksize = newsize;
2073 up_write(&EXT4_I(inode)->i_data_sem);
2074 return ;
2075 }
2076
2077 struct ext4_group_info {
2078 unsigned long bb_state;
2079 struct rb_root bb_free_root;
2080 ext4_grpblk_t bb_first_free; /* first free block */
2081 ext4_grpblk_t bb_free; /* total free blocks */
2082 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2083 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2084 struct list_head bb_prealloc_list;
2085 #ifdef DOUBLE_CHECK
2086 void *bb_bitmap;
2087 #endif
2088 struct rw_semaphore alloc_sem;
2089 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2090 * regions, index is order.
2091 * bb_counters[3] = 5 means
2092 * 5 free 8-block regions. */
2093 };
2094
2095 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2096 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2097
2098 #define EXT4_MB_GRP_NEED_INIT(grp) \
2099 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2100
2101 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2102 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2103 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2104 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2105 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2106 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2107
2108 #define EXT4_MAX_CONTENTION 8
2109 #define EXT4_CONTENTION_THRESHOLD 2
2110
2111 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2112 ext4_group_t group)
2113 {
2114 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2115 }
2116
2117 /*
2118 * Returns true if the filesystem is busy enough that attempts to
2119 * access the block group locks has run into contention.
2120 */
2121 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2122 {
2123 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2124 }
2125
2126 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2127 {
2128 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2129 if (spin_trylock(lock))
2130 /*
2131 * We're able to grab the lock right away, so drop the
2132 * lock contention counter.
2133 */
2134 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2135 else {
2136 /*
2137 * The lock is busy, so bump the contention counter,
2138 * and then wait on the spin lock.
2139 */
2140 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2141 EXT4_MAX_CONTENTION);
2142 spin_lock(lock);
2143 }
2144 }
2145
2146 static inline void ext4_unlock_group(struct super_block *sb,
2147 ext4_group_t group)
2148 {
2149 spin_unlock(ext4_group_lock_ptr(sb, group));
2150 }
2151
2152 static inline void ext4_mark_super_dirty(struct super_block *sb)
2153 {
2154 if (EXT4_SB(sb)->s_journal == NULL)
2155 sb->s_dirt =1;
2156 }
2157
2158 /*
2159 * Block validity checking
2160 */
2161 #define ext4_check_indirect_blockref(inode, bh) \
2162 ext4_check_blockref(__func__, __LINE__, inode, \
2163 (__le32 *)(bh)->b_data, \
2164 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2165
2166 #define ext4_ind_check_inode(inode) \
2167 ext4_check_blockref(__func__, __LINE__, inode, \
2168 EXT4_I(inode)->i_data, \
2169 EXT4_NDIR_BLOCKS)
2170
2171 /*
2172 * Inodes and files operations
2173 */
2174
2175 /* dir.c */
2176 extern const struct file_operations ext4_dir_operations;
2177
2178 /* file.c */
2179 extern const struct inode_operations ext4_file_inode_operations;
2180 extern const struct file_operations ext4_file_operations;
2181 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2182
2183 /* namei.c */
2184 extern const struct inode_operations ext4_dir_inode_operations;
2185 extern const struct inode_operations ext4_special_inode_operations;
2186 extern struct dentry *ext4_get_parent(struct dentry *child);
2187
2188 /* symlink.c */
2189 extern const struct inode_operations ext4_symlink_inode_operations;
2190 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2191
2192 /* block_validity */
2193 extern void ext4_release_system_zone(struct super_block *sb);
2194 extern int ext4_setup_system_zone(struct super_block *sb);
2195 extern int __init ext4_init_system_zone(void);
2196 extern void ext4_exit_system_zone(void);
2197 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2198 ext4_fsblk_t start_blk,
2199 unsigned int count);
2200 extern int ext4_check_blockref(const char *, unsigned int,
2201 struct inode *, __le32 *, unsigned int);
2202
2203 /* extents.c */
2204 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2205 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2206 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2207 int chunk);
2208 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2209 struct ext4_map_blocks *map, int flags);
2210 extern void ext4_ext_truncate(struct inode *);
2211 extern int ext4_ext_punch_hole(struct file *file, loff_t offset,
2212 loff_t length);
2213 extern void ext4_ext_init(struct super_block *);
2214 extern void ext4_ext_release(struct super_block *);
2215 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2216 loff_t len);
2217 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2218 ssize_t len);
2219 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2220 struct ext4_map_blocks *map, int flags);
2221 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2222 __u64 start, __u64 len);
2223 /* move_extent.c */
2224 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2225 __u64 start_orig, __u64 start_donor,
2226 __u64 len, __u64 *moved_len);
2227
2228 /* page-io.c */
2229 extern int __init ext4_init_pageio(void);
2230 extern void ext4_exit_pageio(void);
2231 extern void ext4_ioend_wait(struct inode *);
2232 extern void ext4_free_io_end(ext4_io_end_t *io);
2233 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2234 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2235 extern void ext4_io_submit(struct ext4_io_submit *io);
2236 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2237 struct page *page,
2238 int len,
2239 struct writeback_control *wbc);
2240
2241 /* mmp.c */
2242 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2243
2244 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2245 enum ext4_state_bits {
2246 BH_Uninit /* blocks are allocated but uninitialized on disk */
2247 = BH_JBDPrivateStart,
2248 };
2249
2250 BUFFER_FNS(Uninit, uninit)
2251 TAS_BUFFER_FNS(Uninit, uninit)
2252
2253 /*
2254 * Add new method to test wether block and inode bitmaps are properly
2255 * initialized. With uninit_bg reading the block from disk is not enough
2256 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2257 */
2258 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2259
2260 static inline int bitmap_uptodate(struct buffer_head *bh)
2261 {
2262 return (buffer_uptodate(bh) &&
2263 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2264 }
2265 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2266 {
2267 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2268 }
2269
2270 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2271
2272 /* For ioend & aio unwritten conversion wait queues */
2273 #define EXT4_WQ_HASH_SZ 37
2274 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2275 EXT4_WQ_HASH_SZ])
2276 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2277 EXT4_WQ_HASH_SZ])
2278 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2279 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2280
2281 #define EXT4_RESIZING 0
2282 extern int ext4_resize_begin(struct super_block *sb);
2283 extern void ext4_resize_end(struct super_block *sb);
2284
2285 #endif /* __KERNEL__ */
2286
2287 #endif /* _EXT4_H */
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