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net: cris/eth_v10: Use net_device_stats from struct net_device_stats
[zen-stable.git] / fs / ext4 / ext4.h
blob6a5edea2d70b3ac7c56e8b272686b5a799eabbcf
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, fmt, a...) \
66 ext4_error_file(__func__, __LINE__, (file), (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
112
113 struct ext4_allocation_request {
114 /* target inode for block we're allocating */
115 struct inode *inode;
116 /* how many blocks we want to allocate */
117 unsigned int len;
118 /* logical block in target inode */
119 ext4_lblk_t logical;
120 /* the closest logical allocated block to the left */
121 ext4_lblk_t lleft;
122 /* the closest logical allocated block to the right */
123 ext4_lblk_t lright;
124 /* phys. target (a hint) */
125 ext4_fsblk_t goal;
126 /* phys. block for the closest logical allocated block to the left */
127 ext4_fsblk_t pleft;
128 /* phys. block for the closest logical allocated block to the right */
129 ext4_fsblk_t pright;
130 /* flags. see above EXT4_MB_HINT_* */
131 unsigned int flags;
132 };
133
134 /*
135 * Logical to physical block mapping, used by ext4_map_blocks()
136 *
137 * This structure is used to pass requests into ext4_map_blocks() as
138 * well as to store the information returned by ext4_map_blocks(). It
139 * takes less room on the stack than a struct buffer_head.
140 */
141 #define EXT4_MAP_NEW (1 << BH_New)
142 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
143 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
144 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
145 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
146 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
147 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
148 EXT4_MAP_UNINIT)
149
150 struct ext4_map_blocks {
151 ext4_fsblk_t m_pblk;
152 ext4_lblk_t m_lblk;
153 unsigned int m_len;
154 unsigned int m_flags;
155 };
156
157 /*
158 * For delayed allocation tracking
159 */
160 struct mpage_da_data {
161 struct inode *inode;
162 sector_t b_blocknr; /* start block number of extent */
163 size_t b_size; /* size of extent */
164 unsigned long b_state; /* state of the extent */
165 unsigned long first_page, next_page; /* extent of pages */
166 struct writeback_control *wbc;
167 int io_done;
168 int pages_written;
169 int retval;
170 };
171
172 /*
173 * Flags for ext4_io_end->flags
174 */
175 #define EXT4_IO_END_UNWRITTEN 0x0001
176 #define EXT4_IO_END_ERROR 0x0002
177
178 struct ext4_io_page {
179 struct page *p_page;
180 atomic_t p_count;
181 };
182
183 #define MAX_IO_PAGES 128
184
185 typedef struct ext4_io_end {
186 struct list_head list; /* per-file finished IO list */
187 struct inode *inode; /* file being written to */
188 unsigned int flag; /* unwritten or not */
189 struct page *page; /* page struct for buffer write */
190 loff_t offset; /* offset in the file */
191 ssize_t size; /* size of the extent */
192 struct work_struct work; /* data work queue */
193 struct kiocb *iocb; /* iocb struct for AIO */
194 int result; /* error value for AIO */
195 int num_io_pages;
196 struct ext4_io_page *pages[MAX_IO_PAGES];
197 } ext4_io_end_t;
198
199 struct ext4_io_submit {
200 int io_op;
201 struct bio *io_bio;
202 ext4_io_end_t *io_end;
203 struct ext4_io_page *io_page;
204 sector_t io_next_block;
205 };
206
207 /*
208 * Special inodes numbers
209 */
210 #define EXT4_BAD_INO 1 /* Bad blocks inode */
211 #define EXT4_ROOT_INO 2 /* Root inode */
212 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
213 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
214 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
215 #define EXT4_JOURNAL_INO 8 /* Journal inode */
216
217 /* First non-reserved inode for old ext4 filesystems */
218 #define EXT4_GOOD_OLD_FIRST_INO 11
219
220 /*
221 * Maximal count of links to a file
222 */
223 #define EXT4_LINK_MAX 65000
224
225 /*
226 * Macro-instructions used to manage several block sizes
227 */
228 #define EXT4_MIN_BLOCK_SIZE 1024
229 #define EXT4_MAX_BLOCK_SIZE 65536
230 #define EXT4_MIN_BLOCK_LOG_SIZE 10
231 #define EXT4_MAX_BLOCK_LOG_SIZE 16
232 #ifdef __KERNEL__
233 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
234 #else
235 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
236 #endif
237 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
238 #ifdef __KERNEL__
239 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
240 #else
241 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
242 #endif
243 #ifdef __KERNEL__
244 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
245 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
246 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
247 #else
248 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
249 EXT4_GOOD_OLD_INODE_SIZE : \
250 (s)->s_inode_size)
251 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
252 EXT4_GOOD_OLD_FIRST_INO : \
253 (s)->s_first_ino)
254 #endif
255 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
256
257 /*
258 * Structure of a blocks group descriptor
259 */
260 struct ext4_group_desc
261 {
262 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
263 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
264 __le32 bg_inode_table_lo; /* Inodes table block */
265 __le16 bg_free_blocks_count_lo;/* Free blocks count */
266 __le16 bg_free_inodes_count_lo;/* Free inodes count */
267 __le16 bg_used_dirs_count_lo; /* Directories count */
268 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
269 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
270 __le16 bg_itable_unused_lo; /* Unused inodes count */
271 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
272 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
273 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
274 __le32 bg_inode_table_hi; /* Inodes table block MSB */
275 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
276 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
277 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
278 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
279 __u32 bg_reserved2[3];
280 };
281
282 /*
283 * Structure of a flex block group info
284 */
285
286 struct flex_groups {
287 atomic_t free_inodes;
288 atomic_t free_blocks;
289 atomic_t used_dirs;
290 };
291
292 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
293 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
294 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
295
296 /*
297 * Macro-instructions used to manage group descriptors
298 */
299 #define EXT4_MIN_DESC_SIZE 32
300 #define EXT4_MIN_DESC_SIZE_64BIT 64
301 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
302 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
303 #ifdef __KERNEL__
304 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
305 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
306 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
307 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
308 #else
309 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
310 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
311 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
312 #endif
313
314 /*
315 * Constants relative to the data blocks
316 */
317 #define EXT4_NDIR_BLOCKS 12
318 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
319 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
320 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
321 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
322
323 /*
324 * Inode flags
325 */
326 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
327 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
328 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
329 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
330 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
331 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
332 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
333 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
334 /* Reserved for compression usage... */
335 #define EXT4_DIRTY_FL 0x00000100
336 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
337 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
338 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
339 /* End compression flags --- maybe not all used */
340 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
341 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
342 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
343 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
344 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
345 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
346 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
347 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
348 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
349 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
350 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
351
352 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
353 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
354
355 /* Flags that should be inherited by new inodes from their parent. */
356 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
357 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
358 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
359 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
360 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
361
362 /* Flags that are appropriate for regular files (all but dir-specific ones). */
363 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
364
365 /* Flags that are appropriate for non-directories/regular files. */
366 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
367
368 /* Mask out flags that are inappropriate for the given type of inode. */
369 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
370 {
371 if (S_ISDIR(mode))
372 return flags;
373 else if (S_ISREG(mode))
374 return flags & EXT4_REG_FLMASK;
375 else
376 return flags & EXT4_OTHER_FLMASK;
377 }
378
379 /*
380 * Inode flags used for atomic set/get
381 */
382 enum {
383 EXT4_INODE_SECRM = 0, /* Secure deletion */
384 EXT4_INODE_UNRM = 1, /* Undelete */
385 EXT4_INODE_COMPR = 2, /* Compress file */
386 EXT4_INODE_SYNC = 3, /* Synchronous updates */
387 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
388 EXT4_INODE_APPEND = 5, /* writes to file may only append */
389 EXT4_INODE_NODUMP = 6, /* do not dump file */
390 EXT4_INODE_NOATIME = 7, /* do not update atime */
391 /* Reserved for compression usage... */
392 EXT4_INODE_DIRTY = 8,
393 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
394 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
395 EXT4_INODE_ECOMPR = 11, /* Compression error */
396 /* End compression flags --- maybe not all used */
397 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
398 EXT4_INODE_IMAGIC = 13, /* AFS directory */
399 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
400 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
401 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
402 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
403 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
404 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
405 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
406 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
407 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
408 };
409
410 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
411 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
412 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
413 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
414
415 /*
416 * Since it's pretty easy to mix up bit numbers and hex values, and we
417 * can't do a compile-time test for ENUM values, we use a run-time
418 * test to make sure that EXT4_XXX_FL is consistent with respect to
419 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
420 * out so it won't cost any extra space in the compiled kernel image.
421 * But it's important that these values are the same, since we are
422 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
423 * must be consistent with the values of FS_XXX_FL defined in
424 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
425 * ext4 filesystems, and of course the values defined in e2fsprogs.
426 *
427 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
428 */
429 static inline void ext4_check_flag_values(void)
430 {
431 CHECK_FLAG_VALUE(SECRM);
432 CHECK_FLAG_VALUE(UNRM);
433 CHECK_FLAG_VALUE(COMPR);
434 CHECK_FLAG_VALUE(SYNC);
435 CHECK_FLAG_VALUE(IMMUTABLE);
436 CHECK_FLAG_VALUE(APPEND);
437 CHECK_FLAG_VALUE(NODUMP);
438 CHECK_FLAG_VALUE(NOATIME);
439 CHECK_FLAG_VALUE(DIRTY);
440 CHECK_FLAG_VALUE(COMPRBLK);
441 CHECK_FLAG_VALUE(NOCOMPR);
442 CHECK_FLAG_VALUE(ECOMPR);
443 CHECK_FLAG_VALUE(INDEX);
444 CHECK_FLAG_VALUE(IMAGIC);
445 CHECK_FLAG_VALUE(JOURNAL_DATA);
446 CHECK_FLAG_VALUE(NOTAIL);
447 CHECK_FLAG_VALUE(DIRSYNC);
448 CHECK_FLAG_VALUE(TOPDIR);
449 CHECK_FLAG_VALUE(HUGE_FILE);
450 CHECK_FLAG_VALUE(EXTENTS);
451 CHECK_FLAG_VALUE(EA_INODE);
452 CHECK_FLAG_VALUE(EOFBLOCKS);
453 CHECK_FLAG_VALUE(RESERVED);
454 }
455
456 /* Used to pass group descriptor data when online resize is done */
457 struct ext4_new_group_input {
458 __u32 group; /* Group number for this data */
459 __u64 block_bitmap; /* Absolute block number of block bitmap */
460 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
461 __u64 inode_table; /* Absolute block number of inode table start */
462 __u32 blocks_count; /* Total number of blocks in this group */
463 __u16 reserved_blocks; /* Number of reserved blocks in this group */
464 __u16 unused;
465 };
466
467 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
468 struct compat_ext4_new_group_input {
469 u32 group;
470 compat_u64 block_bitmap;
471 compat_u64 inode_bitmap;
472 compat_u64 inode_table;
473 u32 blocks_count;
474 u16 reserved_blocks;
475 u16 unused;
476 };
477 #endif
478
479 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
480 struct ext4_new_group_data {
481 __u32 group;
482 __u64 block_bitmap;
483 __u64 inode_bitmap;
484 __u64 inode_table;
485 __u32 blocks_count;
486 __u16 reserved_blocks;
487 __u16 unused;
488 __u32 free_blocks_count;
489 };
490
491 /*
492 * Flags used by ext4_map_blocks()
493 */
494 /* Allocate any needed blocks and/or convert an unitialized
495 extent to be an initialized ext4 */
496 #define EXT4_GET_BLOCKS_CREATE 0x0001
497 /* Request the creation of an unitialized extent */
498 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
499 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
500 EXT4_GET_BLOCKS_CREATE)
501 /* Caller is from the delayed allocation writeout path,
502 so set the magic i_delalloc_reserve_flag after taking the
503 inode allocation semaphore for */
504 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
505 /* caller is from the direct IO path, request to creation of an
506 unitialized extents if not allocated, split the uninitialized
507 extent if blocks has been preallocated already*/
508 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
509 #define EXT4_GET_BLOCKS_CONVERT 0x0010
510 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
511 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
512 /* Convert extent to initialized after IO complete */
513 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
514 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
515
516 /*
517 * Flags used by ext4_free_blocks
518 */
519 #define EXT4_FREE_BLOCKS_METADATA 0x0001
520 #define EXT4_FREE_BLOCKS_FORGET 0x0002
521 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
522
523 /*
524 * ioctl commands
525 */
526 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
527 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
528 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
529 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
530 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
531 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
532 #ifdef CONFIG_JBD2_DEBUG
533 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
534 #endif
535 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
536 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
537 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
538 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
539 #define EXT4_IOC_MIGRATE _IO('f', 9)
540 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
541 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
542 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
543 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
544
545 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
546 /*
547 * ioctl commands in 32 bit emulation
548 */
549 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
550 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
551 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
552 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
553 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
554 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
555 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
556 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
557 #ifdef CONFIG_JBD2_DEBUG
558 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
559 #endif
560 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
561 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
562 #endif
563
564
565 /*
566 * Mount options
567 */
568 struct ext4_mount_options {
569 unsigned long s_mount_opt;
570 uid_t s_resuid;
571 gid_t s_resgid;
572 unsigned long s_commit_interval;
573 u32 s_min_batch_time, s_max_batch_time;
574 #ifdef CONFIG_QUOTA
575 int s_jquota_fmt;
576 char *s_qf_names[MAXQUOTAS];
577 #endif
578 };
579
580 /* Max physical block we can addres w/o extents */
581 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
582
583 /*
584 * Structure of an inode on the disk
585 */
586 struct ext4_inode {
587 __le16 i_mode; /* File mode */
588 __le16 i_uid; /* Low 16 bits of Owner Uid */
589 __le32 i_size_lo; /* Size in bytes */
590 __le32 i_atime; /* Access time */
591 __le32 i_ctime; /* Inode Change time */
592 __le32 i_mtime; /* Modification time */
593 __le32 i_dtime; /* Deletion Time */
594 __le16 i_gid; /* Low 16 bits of Group Id */
595 __le16 i_links_count; /* Links count */
596 __le32 i_blocks_lo; /* Blocks count */
597 __le32 i_flags; /* File flags */
598 union {
599 struct {
600 __le32 l_i_version;
601 } linux1;
602 struct {
603 __u32 h_i_translator;
604 } hurd1;
605 struct {
606 __u32 m_i_reserved1;
607 } masix1;
608 } osd1; /* OS dependent 1 */
609 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
610 __le32 i_generation; /* File version (for NFS) */
611 __le32 i_file_acl_lo; /* File ACL */
612 __le32 i_size_high;
613 __le32 i_obso_faddr; /* Obsoleted fragment address */
614 union {
615 struct {
616 __le16 l_i_blocks_high; /* were l_i_reserved1 */
617 __le16 l_i_file_acl_high;
618 __le16 l_i_uid_high; /* these 2 fields */
619 __le16 l_i_gid_high; /* were reserved2[0] */
620 __u32 l_i_reserved2;
621 } linux2;
622 struct {
623 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
624 __u16 h_i_mode_high;
625 __u16 h_i_uid_high;
626 __u16 h_i_gid_high;
627 __u32 h_i_author;
628 } hurd2;
629 struct {
630 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
631 __le16 m_i_file_acl_high;
632 __u32 m_i_reserved2[2];
633 } masix2;
634 } osd2; /* OS dependent 2 */
635 __le16 i_extra_isize;
636 __le16 i_pad1;
637 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
638 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
639 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
640 __le32 i_crtime; /* File Creation time */
641 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
642 __le32 i_version_hi; /* high 32 bits for 64-bit version */
643 };
644
645 struct move_extent {
646 __u32 reserved; /* should be zero */
647 __u32 donor_fd; /* donor file descriptor */
648 __u64 orig_start; /* logical start offset in block for orig */
649 __u64 donor_start; /* logical start offset in block for donor */
650 __u64 len; /* block length to be moved */
651 __u64 moved_len; /* moved block length */
652 };
653
654 #define EXT4_EPOCH_BITS 2
655 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
656 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
657
658 /*
659 * Extended fields will fit into an inode if the filesystem was formatted
660 * with large inodes (-I 256 or larger) and there are not currently any EAs
661 * consuming all of the available space. For new inodes we always reserve
662 * enough space for the kernel's known extended fields, but for inodes
663 * created with an old kernel this might not have been the case. None of
664 * the extended inode fields is critical for correct filesystem operation.
665 * This macro checks if a certain field fits in the inode. Note that
666 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
667 */
668 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
669 ((offsetof(typeof(*ext4_inode), field) + \
670 sizeof((ext4_inode)->field)) \
671 <= (EXT4_GOOD_OLD_INODE_SIZE + \
672 (einode)->i_extra_isize)) \
673
674 static inline __le32 ext4_encode_extra_time(struct timespec *time)
675 {
676 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
677 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
678 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
679 }
680
681 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
682 {
683 if (sizeof(time->tv_sec) > 4)
684 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
685 << 32;
686 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
687 }
688
689 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
690 do { \
691 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
692 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
693 (raw_inode)->xtime ## _extra = \
694 ext4_encode_extra_time(&(inode)->xtime); \
695 } while (0)
696
697 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
698 do { \
699 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
700 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
701 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
702 (raw_inode)->xtime ## _extra = \
703 ext4_encode_extra_time(&(einode)->xtime); \
704 } while (0)
705
706 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
707 do { \
708 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
709 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
710 ext4_decode_extra_time(&(inode)->xtime, \
711 raw_inode->xtime ## _extra); \
712 } while (0)
713
714 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
715 do { \
716 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
717 (einode)->xtime.tv_sec = \
718 (signed)le32_to_cpu((raw_inode)->xtime); \
719 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
720 ext4_decode_extra_time(&(einode)->xtime, \
721 raw_inode->xtime ## _extra); \
722 } while (0)
723
724 #define i_disk_version osd1.linux1.l_i_version
725
726 #if defined(__KERNEL__) || defined(__linux__)
727 #define i_reserved1 osd1.linux1.l_i_reserved1
728 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
729 #define i_blocks_high osd2.linux2.l_i_blocks_high
730 #define i_uid_low i_uid
731 #define i_gid_low i_gid
732 #define i_uid_high osd2.linux2.l_i_uid_high
733 #define i_gid_high osd2.linux2.l_i_gid_high
734 #define i_reserved2 osd2.linux2.l_i_reserved2
735
736 #elif defined(__GNU__)
737
738 #define i_translator osd1.hurd1.h_i_translator
739 #define i_uid_high osd2.hurd2.h_i_uid_high
740 #define i_gid_high osd2.hurd2.h_i_gid_high
741 #define i_author osd2.hurd2.h_i_author
742
743 #elif defined(__masix__)
744
745 #define i_reserved1 osd1.masix1.m_i_reserved1
746 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
747 #define i_reserved2 osd2.masix2.m_i_reserved2
748
749 #endif /* defined(__KERNEL__) || defined(__linux__) */
750
751 /*
752 * storage for cached extent
753 */
754 struct ext4_ext_cache {
755 ext4_fsblk_t ec_start;
756 ext4_lblk_t ec_block;
757 __u32 ec_len; /* must be 32bit to return holes */
758 __u32 ec_type;
759 };
760
761 /*
762 * fourth extended file system inode data in memory
763 */
764 struct ext4_inode_info {
765 __le32 i_data[15]; /* unconverted */
766 __u32 i_dtime;
767 ext4_fsblk_t i_file_acl;
768
769 /*
770 * i_block_group is the number of the block group which contains
771 * this file's inode. Constant across the lifetime of the inode,
772 * it is ued for making block allocation decisions - we try to
773 * place a file's data blocks near its inode block, and new inodes
774 * near to their parent directory's inode.
775 */
776 ext4_group_t i_block_group;
777 unsigned long i_state_flags; /* Dynamic state flags */
778 unsigned long i_flags;
779
780 ext4_lblk_t i_dir_start_lookup;
781 #ifdef CONFIG_EXT4_FS_XATTR
782 /*
783 * Extended attributes can be read independently of the main file
784 * data. Taking i_mutex even when reading would cause contention
785 * between readers of EAs and writers of regular file data, so
786 * instead we synchronize on xattr_sem when reading or changing
787 * EAs.
788 */
789 struct rw_semaphore xattr_sem;
790 #endif
791
792 struct list_head i_orphan; /* unlinked but open inodes */
793
794 /*
795 * i_disksize keeps track of what the inode size is ON DISK, not
796 * in memory. During truncate, i_size is set to the new size by
797 * the VFS prior to calling ext4_truncate(), but the filesystem won't
798 * set i_disksize to 0 until the truncate is actually under way.
799 *
800 * The intent is that i_disksize always represents the blocks which
801 * are used by this file. This allows recovery to restart truncate
802 * on orphans if we crash during truncate. We actually write i_disksize
803 * into the on-disk inode when writing inodes out, instead of i_size.
804 *
805 * The only time when i_disksize and i_size may be different is when
806 * a truncate is in progress. The only things which change i_disksize
807 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
808 */
809 loff_t i_disksize;
810
811 /*
812 * i_data_sem is for serialising ext4_truncate() against
813 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
814 * data tree are chopped off during truncate. We can't do that in
815 * ext4 because whenever we perform intermediate commits during
816 * truncate, the inode and all the metadata blocks *must* be in a
817 * consistent state which allows truncation of the orphans to restart
818 * during recovery. Hence we must fix the get_block-vs-truncate race
819 * by other means, so we have i_data_sem.
820 */
821 struct rw_semaphore i_data_sem;
822 struct inode vfs_inode;
823 struct jbd2_inode jinode;
824
825 struct ext4_ext_cache i_cached_extent;
826 /*
827 * File creation time. Its function is same as that of
828 * struct timespec i_{a,c,m}time in the generic inode.
829 */
830 struct timespec i_crtime;
831
832 /* mballoc */
833 struct list_head i_prealloc_list;
834 spinlock_t i_prealloc_lock;
835
836 /* ialloc */
837 ext4_group_t i_last_alloc_group;
838
839 /* allocation reservation info for delalloc */
840 unsigned int i_reserved_data_blocks;
841 unsigned int i_reserved_meta_blocks;
842 unsigned int i_allocated_meta_blocks;
843 unsigned short i_delalloc_reserved_flag;
844 sector_t i_da_metadata_calc_last_lblock;
845 int i_da_metadata_calc_len;
846
847 /* on-disk additional length */
848 __u16 i_extra_isize;
849
850 spinlock_t i_block_reservation_lock;
851 #ifdef CONFIG_QUOTA
852 /* quota space reservation, managed internally by quota code */
853 qsize_t i_reserved_quota;
854 #endif
855
856 /* completed IOs that might need unwritten extents handling */
857 struct list_head i_completed_io_list;
858 spinlock_t i_completed_io_lock;
859 /* current io_end structure for async DIO write*/
860 ext4_io_end_t *cur_aio_dio;
861 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
862
863 /*
864 * Transactions that contain inode's metadata needed to complete
865 * fsync and fdatasync, respectively.
866 */
867 tid_t i_sync_tid;
868 tid_t i_datasync_tid;
869 };
870
871 /*
872 * File system states
873 */
874 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
875 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
876 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
877
878 /*
879 * Misc. filesystem flags
880 */
881 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
882 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
883 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
884
885 /*
886 * Mount flags
887 */
888 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
889 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
890 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
891 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
892 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
893 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
894 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
895 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
896 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
897 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
898 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
899 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
900 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
901 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
902 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
903 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
904 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
905 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
906 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
907 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
908 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
909 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
910 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
911 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
912 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
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 clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
920 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
921 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
922 EXT4_MOUNT_##opt)
923
924 #define ext4_set_bit ext2_set_bit
925 #define ext4_set_bit_atomic ext2_set_bit_atomic
926 #define ext4_clear_bit ext2_clear_bit
927 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
928 #define ext4_test_bit ext2_test_bit
929 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
930 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
931 #define ext4_find_next_bit ext2_find_next_bit
932
933 /*
934 * Maximal mount counts between two filesystem checks
935 */
936 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
937 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
938
939 /*
940 * Behaviour when detecting errors
941 */
942 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
943 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
944 #define EXT4_ERRORS_PANIC 3 /* Panic */
945 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
946
947 /*
948 * Structure of the super block
949 */
950 struct ext4_super_block {
951 /*00*/ __le32 s_inodes_count; /* Inodes count */
952 __le32 s_blocks_count_lo; /* Blocks count */
953 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
954 __le32 s_free_blocks_count_lo; /* Free blocks count */
955 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
956 __le32 s_first_data_block; /* First Data Block */
957 __le32 s_log_block_size; /* Block size */
958 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
959 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
960 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
961 __le32 s_inodes_per_group; /* # Inodes per group */
962 __le32 s_mtime; /* Mount time */
963 /*30*/ __le32 s_wtime; /* Write time */
964 __le16 s_mnt_count; /* Mount count */
965 __le16 s_max_mnt_count; /* Maximal mount count */
966 __le16 s_magic; /* Magic signature */
967 __le16 s_state; /* File system state */
968 __le16 s_errors; /* Behaviour when detecting errors */
969 __le16 s_minor_rev_level; /* minor revision level */
970 /*40*/ __le32 s_lastcheck; /* time of last check */
971 __le32 s_checkinterval; /* max. time between checks */
972 __le32 s_creator_os; /* OS */
973 __le32 s_rev_level; /* Revision level */
974 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
975 __le16 s_def_resgid; /* Default gid for reserved blocks */
976 /*
977 * These fields are for EXT4_DYNAMIC_REV superblocks only.
978 *
979 * Note: the difference between the compatible feature set and
980 * the incompatible feature set is that if there is a bit set
981 * in the incompatible feature set that the kernel doesn't
982 * know about, it should refuse to mount the filesystem.
983 *
984 * e2fsck's requirements are more strict; if it doesn't know
985 * about a feature in either the compatible or incompatible
986 * feature set, it must abort and not try to meddle with
987 * things it doesn't understand...
988 */
989 __le32 s_first_ino; /* First non-reserved inode */
990 __le16 s_inode_size; /* size of inode structure */
991 __le16 s_block_group_nr; /* block group # of this superblock */
992 __le32 s_feature_compat; /* compatible feature set */
993 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
994 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
995 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
996 /*78*/ char s_volume_name[16]; /* volume name */
997 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
998 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
999 /*
1000 * Performance hints. Directory preallocation should only
1001 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1002 */
1003 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1004 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1005 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1006 /*
1007 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1008 */
1009 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1010 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1011 __le32 s_journal_dev; /* device number of journal file */
1012 __le32 s_last_orphan; /* start of list of inodes to delete */
1013 __le32 s_hash_seed[4]; /* HTREE hash seed */
1014 __u8 s_def_hash_version; /* Default hash version to use */
1015 __u8 s_jnl_backup_type;
1016 __le16 s_desc_size; /* size of group descriptor */
1017 /*100*/ __le32 s_default_mount_opts;
1018 __le32 s_first_meta_bg; /* First metablock block group */
1019 __le32 s_mkfs_time; /* When the filesystem was created */
1020 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1021 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1022 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1023 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1024 __le32 s_free_blocks_count_hi; /* Free blocks count */
1025 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1026 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1027 __le32 s_flags; /* Miscellaneous flags */
1028 __le16 s_raid_stride; /* RAID stride */
1029 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
1030 __le64 s_mmp_block; /* Block for multi-mount protection */
1031 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1032 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1033 __u8 s_reserved_char_pad;
1034 __le16 s_reserved_pad;
1035 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1036 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1037 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1038 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1039 snapshot's future use */
1040 __le32 s_snapshot_list; /* inode number of the head of the
1041 on-disk snapshot list */
1042 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1043 __le32 s_error_count; /* number of fs errors */
1044 __le32 s_first_error_time; /* first time an error happened */
1045 __le32 s_first_error_ino; /* inode involved in first error */
1046 __le64 s_first_error_block; /* block involved of first error */
1047 __u8 s_first_error_func[32]; /* function where the error happened */
1048 __le32 s_first_error_line; /* line number where error happened */
1049 __le32 s_last_error_time; /* most recent time of an error */
1050 __le32 s_last_error_ino; /* inode involved in last error */
1051 __le32 s_last_error_line; /* line number where error happened */
1052 __le64 s_last_error_block; /* block involved of last error */
1053 __u8 s_last_error_func[32]; /* function where the error happened */
1054 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1055 __u8 s_mount_opts[64];
1056 __le32 s_reserved[112]; /* Padding to the end of the block */
1057 };
1058
1059 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1060
1061 #ifdef __KERNEL__
1062
1063 /*
1064 * run-time mount flags
1065 */
1066 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1067 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1068
1069 /*
1070 * fourth extended-fs super-block data in memory
1071 */
1072 struct ext4_sb_info {
1073 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1074 unsigned long s_inodes_per_block;/* Number of inodes per block */
1075 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1076 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1077 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1078 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1079 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1080 ext4_group_t s_groups_count; /* Number of groups in the fs */
1081 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1082 unsigned long s_overhead_last; /* Last calculated overhead */
1083 unsigned long s_blocks_last; /* Last seen block count */
1084 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1085 struct buffer_head * s_sbh; /* Buffer containing the super block */
1086 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1087 struct buffer_head **s_group_desc;
1088 unsigned int s_mount_opt;
1089 unsigned int s_mount_flags;
1090 ext4_fsblk_t s_sb_block;
1091 uid_t s_resuid;
1092 gid_t s_resgid;
1093 unsigned short s_mount_state;
1094 unsigned short s_pad;
1095 int s_addr_per_block_bits;
1096 int s_desc_per_block_bits;
1097 int s_inode_size;
1098 int s_first_ino;
1099 unsigned int s_inode_readahead_blks;
1100 unsigned int s_inode_goal;
1101 spinlock_t s_next_gen_lock;
1102 u32 s_next_generation;
1103 u32 s_hash_seed[4];
1104 int s_def_hash_version;
1105 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1106 struct percpu_counter s_freeblocks_counter;
1107 struct percpu_counter s_freeinodes_counter;
1108 struct percpu_counter s_dirs_counter;
1109 struct percpu_counter s_dirtyblocks_counter;
1110 struct blockgroup_lock *s_blockgroup_lock;
1111 struct proc_dir_entry *s_proc;
1112 struct kobject s_kobj;
1113 struct completion s_kobj_unregister;
1114
1115 /* Journaling */
1116 struct journal_s *s_journal;
1117 struct list_head s_orphan;
1118 struct mutex s_orphan_lock;
1119 struct mutex s_resize_lock;
1120 unsigned long s_commit_interval;
1121 u32 s_max_batch_time;
1122 u32 s_min_batch_time;
1123 struct block_device *journal_bdev;
1124 #ifdef CONFIG_JBD2_DEBUG
1125 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1126 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1127 #endif
1128 #ifdef CONFIG_QUOTA
1129 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1130 int s_jquota_fmt; /* Format of quota to use */
1131 #endif
1132 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1133 struct rb_root system_blks;
1134
1135 #ifdef EXTENTS_STATS
1136 /* ext4 extents stats */
1137 unsigned long s_ext_min;
1138 unsigned long s_ext_max;
1139 unsigned long s_depth_max;
1140 spinlock_t s_ext_stats_lock;
1141 unsigned long s_ext_blocks;
1142 unsigned long s_ext_extents;
1143 #endif
1144
1145 /* for buddy allocator */
1146 struct ext4_group_info ***s_group_info;
1147 struct inode *s_buddy_cache;
1148 spinlock_t s_md_lock;
1149 unsigned short *s_mb_offsets;
1150 unsigned int *s_mb_maxs;
1151
1152 /* tunables */
1153 unsigned long s_stripe;
1154 unsigned int s_mb_stream_request;
1155 unsigned int s_mb_max_to_scan;
1156 unsigned int s_mb_min_to_scan;
1157 unsigned int s_mb_stats;
1158 unsigned int s_mb_order2_reqs;
1159 unsigned int s_mb_group_prealloc;
1160 unsigned int s_max_writeback_mb_bump;
1161 /* where last allocation was done - for stream allocation */
1162 unsigned long s_mb_last_group;
1163 unsigned long s_mb_last_start;
1164
1165 /* stats for buddy allocator */
1166 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1167 atomic_t s_bal_success; /* we found long enough chunks */
1168 atomic_t s_bal_allocated; /* in blocks */
1169 atomic_t s_bal_ex_scanned; /* total extents scanned */
1170 atomic_t s_bal_goals; /* goal hits */
1171 atomic_t s_bal_breaks; /* too long searches */
1172 atomic_t s_bal_2orders; /* 2^order hits */
1173 spinlock_t s_bal_lock;
1174 unsigned long s_mb_buddies_generated;
1175 unsigned long long s_mb_generation_time;
1176 atomic_t s_mb_lost_chunks;
1177 atomic_t s_mb_preallocated;
1178 atomic_t s_mb_discarded;
1179 atomic_t s_lock_busy;
1180
1181 /* locality groups */
1182 struct ext4_locality_group __percpu *s_locality_groups;
1183
1184 /* for write statistics */
1185 unsigned long s_sectors_written_start;
1186 u64 s_kbytes_written;
1187
1188 unsigned int s_log_groups_per_flex;
1189 struct flex_groups *s_flex_groups;
1190
1191 /* workqueue for dio unwritten */
1192 struct workqueue_struct *dio_unwritten_wq;
1193
1194 /* timer for periodic error stats printing */
1195 struct timer_list s_err_report;
1196
1197 /* Lazy inode table initialization info */
1198 struct ext4_li_request *s_li_request;
1199 /* Wait multiplier for lazy initialization thread */
1200 unsigned int s_li_wait_mult;
1201 };
1202
1203 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1204 {
1205 return sb->s_fs_info;
1206 }
1207 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1208 {
1209 return container_of(inode, struct ext4_inode_info, vfs_inode);
1210 }
1211
1212 static inline struct timespec ext4_current_time(struct inode *inode)
1213 {
1214 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1215 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1216 }
1217
1218 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1219 {
1220 return ino == EXT4_ROOT_INO ||
1221 ino == EXT4_JOURNAL_INO ||
1222 ino == EXT4_RESIZE_INO ||
1223 (ino >= EXT4_FIRST_INO(sb) &&
1224 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1225 }
1226
1227 /*
1228 * Inode dynamic state flags
1229 */
1230 enum {
1231 EXT4_STATE_JDATA, /* journaled data exists */
1232 EXT4_STATE_NEW, /* inode is newly created */
1233 EXT4_STATE_XATTR, /* has in-inode xattrs */
1234 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1235 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1236 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1237 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1238 EXT4_STATE_NEWENTRY, /* File just added to dir */
1239 };
1240
1241 #define EXT4_INODE_BIT_FNS(name, field) \
1242 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1243 { \
1244 return test_bit(bit, &EXT4_I(inode)->i_##field); \
1245 } \
1246 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1247 { \
1248 set_bit(bit, &EXT4_I(inode)->i_##field); \
1249 } \
1250 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1251 { \
1252 clear_bit(bit, &EXT4_I(inode)->i_##field); \
1253 }
1254
1255 EXT4_INODE_BIT_FNS(flag, flags)
1256 EXT4_INODE_BIT_FNS(state, state_flags)
1257 #else
1258 /* Assume that user mode programs are passing in an ext4fs superblock, not
1259 * a kernel struct super_block. This will allow us to call the feature-test
1260 * macros from user land. */
1261 #define EXT4_SB(sb) (sb)
1262 #endif
1263
1264 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1265
1266 /*
1267 * Codes for operating systems
1268 */
1269 #define EXT4_OS_LINUX 0
1270 #define EXT4_OS_HURD 1
1271 #define EXT4_OS_MASIX 2
1272 #define EXT4_OS_FREEBSD 3
1273 #define EXT4_OS_LITES 4
1274
1275 /*
1276 * Revision levels
1277 */
1278 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1279 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1280
1281 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1282 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1283
1284 #define EXT4_GOOD_OLD_INODE_SIZE 128
1285
1286 /*
1287 * Feature set definitions
1288 */
1289
1290 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1291 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1292 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1293 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1294 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1295 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1296 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1297 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1298 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1299 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1300 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1301 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1302 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1303 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1304 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1305 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1306 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1307 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1308
1309 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1310 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1311 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1312 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1313 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1314 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1315
1316 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1317 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1318 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1319 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1320 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1321 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1322 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1323
1324 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1325 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1326 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1327 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1328 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1329 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1330 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1331 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1332 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1333 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1334 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1335
1336 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1337 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1338 EXT4_FEATURE_INCOMPAT_RECOVER| \
1339 EXT4_FEATURE_INCOMPAT_META_BG| \
1340 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1341 EXT4_FEATURE_INCOMPAT_64BIT| \
1342 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1343 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1344 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1345 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1346 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1347 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1348 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1349 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1350
1351 /*
1352 * Default values for user and/or group using reserved blocks
1353 */
1354 #define EXT4_DEF_RESUID 0
1355 #define EXT4_DEF_RESGID 0
1356
1357 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1358
1359 /*
1360 * Default mount options
1361 */
1362 #define EXT4_DEFM_DEBUG 0x0001
1363 #define EXT4_DEFM_BSDGROUPS 0x0002
1364 #define EXT4_DEFM_XATTR_USER 0x0004
1365 #define EXT4_DEFM_ACL 0x0008
1366 #define EXT4_DEFM_UID16 0x0010
1367 #define EXT4_DEFM_JMODE 0x0060
1368 #define EXT4_DEFM_JMODE_DATA 0x0020
1369 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1370 #define EXT4_DEFM_JMODE_WBACK 0x0060
1371 #define EXT4_DEFM_NOBARRIER 0x0100
1372 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1373 #define EXT4_DEFM_DISCARD 0x0400
1374 #define EXT4_DEFM_NODELALLOC 0x0800
1375
1376 /*
1377 * Default journal batch times
1378 */
1379 #define EXT4_DEF_MIN_BATCH_TIME 0
1380 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1381
1382 /*
1383 * Minimum number of groups in a flexgroup before we separate out
1384 * directories into the first block group of a flexgroup
1385 */
1386 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1387
1388 /*
1389 * Structure of a directory entry
1390 */
1391 #define EXT4_NAME_LEN 255
1392
1393 struct ext4_dir_entry {
1394 __le32 inode; /* Inode number */
1395 __le16 rec_len; /* Directory entry length */
1396 __le16 name_len; /* Name length */
1397 char name[EXT4_NAME_LEN]; /* File name */
1398 };
1399
1400 /*
1401 * The new version of the directory entry. Since EXT4 structures are
1402 * stored in intel byte order, and the name_len field could never be
1403 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1404 * file_type field.
1405 */
1406 struct ext4_dir_entry_2 {
1407 __le32 inode; /* Inode number */
1408 __le16 rec_len; /* Directory entry length */
1409 __u8 name_len; /* Name length */
1410 __u8 file_type;
1411 char name[EXT4_NAME_LEN]; /* File name */
1412 };
1413
1414 /*
1415 * Ext4 directory file types. Only the low 3 bits are used. The
1416 * other bits are reserved for now.
1417 */
1418 #define EXT4_FT_UNKNOWN 0
1419 #define EXT4_FT_REG_FILE 1
1420 #define EXT4_FT_DIR 2
1421 #define EXT4_FT_CHRDEV 3
1422 #define EXT4_FT_BLKDEV 4
1423 #define EXT4_FT_FIFO 5
1424 #define EXT4_FT_SOCK 6
1425 #define EXT4_FT_SYMLINK 7
1426
1427 #define EXT4_FT_MAX 8
1428
1429 /*
1430 * EXT4_DIR_PAD defines the directory entries boundaries
1431 *
1432 * NOTE: It must be a multiple of 4
1433 */
1434 #define EXT4_DIR_PAD 4
1435 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1436 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1437 ~EXT4_DIR_ROUND)
1438 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1439
1440 /*
1441 * If we ever get support for fs block sizes > page_size, we'll need
1442 * to remove the #if statements in the next two functions...
1443 */
1444 static inline unsigned int
1445 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1446 {
1447 unsigned len = le16_to_cpu(dlen);
1448
1449 #if (PAGE_CACHE_SIZE >= 65536)
1450 if (len == EXT4_MAX_REC_LEN || len == 0)
1451 return blocksize;
1452 return (len & 65532) | ((len & 3) << 16);
1453 #else
1454 return len;
1455 #endif
1456 }
1457
1458 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1459 {
1460 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1461 BUG();
1462 #if (PAGE_CACHE_SIZE >= 65536)
1463 if (len < 65536)
1464 return cpu_to_le16(len);
1465 if (len == blocksize) {
1466 if (blocksize == 65536)
1467 return cpu_to_le16(EXT4_MAX_REC_LEN);
1468 else
1469 return cpu_to_le16(0);
1470 }
1471 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1472 #else
1473 return cpu_to_le16(len);
1474 #endif
1475 }
1476
1477 /*
1478 * Hash Tree Directory indexing
1479 * (c) Daniel Phillips, 2001
1480 */
1481
1482 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1483 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1484 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1485 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1486 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1487
1488 /* Legal values for the dx_root hash_version field: */
1489
1490 #define DX_HASH_LEGACY 0
1491 #define DX_HASH_HALF_MD4 1
1492 #define DX_HASH_TEA 2
1493 #define DX_HASH_LEGACY_UNSIGNED 3
1494 #define DX_HASH_HALF_MD4_UNSIGNED 4
1495 #define DX_HASH_TEA_UNSIGNED 5
1496
1497 #ifdef __KERNEL__
1498
1499 /* hash info structure used by the directory hash */
1500 struct dx_hash_info
1501 {
1502 u32 hash;
1503 u32 minor_hash;
1504 int hash_version;
1505 u32 *seed;
1506 };
1507
1508 #define EXT4_HTREE_EOF 0x7fffffff
1509
1510 /*
1511 * Control parameters used by ext4_htree_next_block
1512 */
1513 #define HASH_NB_ALWAYS 1
1514
1515
1516 /*
1517 * Describe an inode's exact location on disk and in memory
1518 */
1519 struct ext4_iloc
1520 {
1521 struct buffer_head *bh;
1522 unsigned long offset;
1523 ext4_group_t block_group;
1524 };
1525
1526 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1527 {
1528 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1529 }
1530
1531 /*
1532 * This structure is stuffed into the struct file's private_data field
1533 * for directories. It is where we put information so that we can do
1534 * readdir operations in hash tree order.
1535 */
1536 struct dir_private_info {
1537 struct rb_root root;
1538 struct rb_node *curr_node;
1539 struct fname *extra_fname;
1540 loff_t last_pos;
1541 __u32 curr_hash;
1542 __u32 curr_minor_hash;
1543 __u32 next_hash;
1544 };
1545
1546 /* calculate the first block number of the group */
1547 static inline ext4_fsblk_t
1548 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1549 {
1550 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1551 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1552 }
1553
1554 /*
1555 * Special error return code only used by dx_probe() and its callers.
1556 */
1557 #define ERR_BAD_DX_DIR -75000
1558
1559 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1560 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1561
1562 /*
1563 * Timeout and state flag for lazy initialization inode thread.
1564 */
1565 #define EXT4_DEF_LI_WAIT_MULT 10
1566 #define EXT4_DEF_LI_MAX_START_DELAY 5
1567 #define EXT4_LAZYINIT_QUIT 0x0001
1568 #define EXT4_LAZYINIT_RUNNING 0x0002
1569
1570 /*
1571 * Lazy inode table initialization info
1572 */
1573 struct ext4_lazy_init {
1574 unsigned long li_state;
1575
1576 wait_queue_head_t li_wait_daemon;
1577 wait_queue_head_t li_wait_task;
1578 struct timer_list li_timer;
1579 struct task_struct *li_task;
1580
1581 struct list_head li_request_list;
1582 struct mutex li_list_mtx;
1583 };
1584
1585 struct ext4_li_request {
1586 struct super_block *lr_super;
1587 struct ext4_sb_info *lr_sbi;
1588 ext4_group_t lr_next_group;
1589 struct list_head lr_request;
1590 unsigned long lr_next_sched;
1591 unsigned long lr_timeout;
1592 };
1593
1594 struct ext4_features {
1595 struct kobject f_kobj;
1596 struct completion f_kobj_unregister;
1597 };
1598
1599 /*
1600 * Function prototypes
1601 */
1602
1603 /*
1604 * Ok, these declarations are also in <linux/kernel.h> but none of the
1605 * ext4 source programs needs to include it so they are duplicated here.
1606 */
1607 # define NORET_TYPE /**/
1608 # define ATTRIB_NORET __attribute__((noreturn))
1609 # define NORET_AND noreturn,
1610
1611 /* bitmap.c */
1612 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1613
1614 /* balloc.c */
1615 extern unsigned int ext4_block_group(struct super_block *sb,
1616 ext4_fsblk_t blocknr);
1617 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1618 ext4_fsblk_t blocknr);
1619 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1620 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1621 ext4_group_t group);
1622 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1623 ext4_fsblk_t goal, unsigned long *count, int *errp);
1624 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1625 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1626 ext4_fsblk_t block, unsigned long count);
1627 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1628 extern void ext4_check_blocks_bitmap(struct super_block *);
1629 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1630 ext4_group_t block_group,
1631 struct buffer_head ** bh);
1632 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1633 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1634 ext4_group_t block_group);
1635 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1636 struct buffer_head *bh,
1637 ext4_group_t group,
1638 struct ext4_group_desc *desc);
1639 #define ext4_free_blocks_after_init(sb, group, desc) \
1640 ext4_init_block_bitmap(sb, NULL, group, desc)
1641
1642 /* dir.c */
1643 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1644 struct ext4_dir_entry_2 *,
1645 struct buffer_head *, unsigned int);
1646 #define ext4_check_dir_entry(dir, de, bh, offset) \
1647 __ext4_check_dir_entry(__func__, __LINE__, (dir), (de), (bh), (offset))
1648 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1649 __u32 minor_hash,
1650 struct ext4_dir_entry_2 *dirent);
1651 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1652
1653 /* fsync.c */
1654 extern int ext4_sync_file(struct file *, int);
1655
1656 /* hash.c */
1657 extern int ext4fs_dirhash(const char *name, int len, struct
1658 dx_hash_info *hinfo);
1659
1660 /* ialloc.c */
1661 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1662 const struct qstr *qstr, __u32 goal);
1663 extern void ext4_free_inode(handle_t *, struct inode *);
1664 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1665 extern unsigned long ext4_count_free_inodes(struct super_block *);
1666 extern unsigned long ext4_count_dirs(struct super_block *);
1667 extern void ext4_check_inodes_bitmap(struct super_block *);
1668 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1669 extern int ext4_init_inode_table(struct super_block *sb,
1670 ext4_group_t group, int barrier);
1671
1672 /* mballoc.c */
1673 extern long ext4_mb_stats;
1674 extern long ext4_mb_max_to_scan;
1675 extern int ext4_mb_init(struct super_block *, int);
1676 extern int ext4_mb_release(struct super_block *);
1677 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1678 struct ext4_allocation_request *, int *);
1679 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1680 extern void ext4_discard_preallocations(struct inode *);
1681 extern int __init ext4_init_mballoc(void);
1682 extern void ext4_exit_mballoc(void);
1683 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1684 struct buffer_head *bh, ext4_fsblk_t block,
1685 unsigned long count, int flags);
1686 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1687 ext4_group_t i, struct ext4_group_desc *desc);
1688 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
1689
1690 /* inode.c */
1691 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1692 ext4_lblk_t, int, int *);
1693 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1694 ext4_lblk_t, int, int *);
1695 int ext4_get_block(struct inode *inode, sector_t iblock,
1696 struct buffer_head *bh_result, int create);
1697
1698 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1699 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1700 extern int ext4_setattr(struct dentry *, struct iattr *);
1701 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1702 struct kstat *stat);
1703 extern void ext4_evict_inode(struct inode *);
1704 extern void ext4_clear_inode(struct inode *);
1705 extern int ext4_sync_inode(handle_t *, struct inode *);
1706 extern void ext4_dirty_inode(struct inode *);
1707 extern int ext4_change_inode_journal_flag(struct inode *, int);
1708 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1709 extern int ext4_can_truncate(struct inode *inode);
1710 extern void ext4_truncate(struct inode *);
1711 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1712 extern void ext4_set_inode_flags(struct inode *);
1713 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1714 extern int ext4_alloc_da_blocks(struct inode *inode);
1715 extern void ext4_set_aops(struct inode *inode);
1716 extern int ext4_writepage_trans_blocks(struct inode *);
1717 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1718 extern int ext4_block_truncate_page(handle_t *handle,
1719 struct address_space *mapping, loff_t from);
1720 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1721 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1722 extern void ext4_da_update_reserve_space(struct inode *inode,
1723 int used, int quota_claim);
1724 /* ioctl.c */
1725 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1726 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1727
1728 /* migrate.c */
1729 extern int ext4_ext_migrate(struct inode *);
1730
1731 /* namei.c */
1732 extern int ext4_orphan_add(handle_t *, struct inode *);
1733 extern int ext4_orphan_del(handle_t *, struct inode *);
1734 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1735 __u32 start_minor_hash, __u32 *next_hash);
1736
1737 /* resize.c */
1738 extern int ext4_group_add(struct super_block *sb,
1739 struct ext4_new_group_data *input);
1740 extern int ext4_group_extend(struct super_block *sb,
1741 struct ext4_super_block *es,
1742 ext4_fsblk_t n_blocks_count);
1743
1744 /* super.c */
1745 extern void __ext4_error(struct super_block *, const char *, unsigned int,
1746 const char *, ...)
1747 __attribute__ ((format (printf, 4, 5)));
1748 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1749 __LINE__, ## message)
1750 extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1751 ext4_fsblk_t, const char *, ...)
1752 __attribute__ ((format (printf, 5, 6)));
1753 extern void ext4_error_file(struct file *, const char *, unsigned int,
1754 const char *, ...)
1755 __attribute__ ((format (printf, 4, 5)));
1756 extern void __ext4_std_error(struct super_block *, const char *,
1757 unsigned int, int);
1758 extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1759 const char *, ...)
1760 __attribute__ ((format (printf, 4, 5)));
1761 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1762 __LINE__, ## message)
1763 extern void __ext4_warning(struct super_block *, const char *, unsigned int,
1764 const char *, ...)
1765 __attribute__ ((format (printf, 4, 5)));
1766 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1767 __LINE__, ## message)
1768 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1769 __attribute__ ((format (printf, 3, 4)));
1770 extern void __ext4_grp_locked_error(const char *, unsigned int, \
1771 struct super_block *, ext4_group_t, \
1772 unsigned long, ext4_fsblk_t, \
1773 const char *, ...)
1774 __attribute__ ((format (printf, 7, 8)));
1775 #define ext4_grp_locked_error(sb, grp, message...) \
1776 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1777 extern void ext4_update_dynamic_rev(struct super_block *sb);
1778 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1779 __u32 compat);
1780 extern int ext4_update_rocompat_feature(handle_t *handle,
1781 struct super_block *sb, __u32 rocompat);
1782 extern int ext4_update_incompat_feature(handle_t *handle,
1783 struct super_block *sb, __u32 incompat);
1784 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1785 struct ext4_group_desc *bg);
1786 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1787 struct ext4_group_desc *bg);
1788 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1789 struct ext4_group_desc *bg);
1790 extern __u32 ext4_free_blks_count(struct super_block *sb,
1791 struct ext4_group_desc *bg);
1792 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1793 struct ext4_group_desc *bg);
1794 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1795 struct ext4_group_desc *bg);
1796 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1797 struct ext4_group_desc *bg);
1798 extern void ext4_block_bitmap_set(struct super_block *sb,
1799 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1800 extern void ext4_inode_bitmap_set(struct super_block *sb,
1801 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1802 extern void ext4_inode_table_set(struct super_block *sb,
1803 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1804 extern void ext4_free_blks_set(struct super_block *sb,
1805 struct ext4_group_desc *bg, __u32 count);
1806 extern void ext4_free_inodes_set(struct super_block *sb,
1807 struct ext4_group_desc *bg, __u32 count);
1808 extern void ext4_used_dirs_set(struct super_block *sb,
1809 struct ext4_group_desc *bg, __u32 count);
1810 extern void ext4_itable_unused_set(struct super_block *sb,
1811 struct ext4_group_desc *bg, __u32 count);
1812 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1813 struct ext4_group_desc *gdp);
1814 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1815 struct ext4_group_desc *gdp);
1816
1817 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1818 {
1819 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1820 le32_to_cpu(es->s_blocks_count_lo);
1821 }
1822
1823 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1824 {
1825 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1826 le32_to_cpu(es->s_r_blocks_count_lo);
1827 }
1828
1829 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1830 {
1831 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1832 le32_to_cpu(es->s_free_blocks_count_lo);
1833 }
1834
1835 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1836 ext4_fsblk_t blk)
1837 {
1838 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1839 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1840 }
1841
1842 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1843 ext4_fsblk_t blk)
1844 {
1845 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1846 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1847 }
1848
1849 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1850 ext4_fsblk_t blk)
1851 {
1852 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1853 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1854 }
1855
1856 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1857 {
1858 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1859 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1860 le32_to_cpu(raw_inode->i_size_lo);
1861 else
1862 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1863 }
1864
1865 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1866 {
1867 raw_inode->i_size_lo = cpu_to_le32(i_size);
1868 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1869 }
1870
1871 static inline
1872 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1873 ext4_group_t group)
1874 {
1875 struct ext4_group_info ***grp_info;
1876 long indexv, indexh;
1877 grp_info = EXT4_SB(sb)->s_group_info;
1878 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1879 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1880 return grp_info[indexv][indexh];
1881 }
1882
1883 /*
1884 * Reading s_groups_count requires using smp_rmb() afterwards. See
1885 * the locking protocol documented in the comments of ext4_group_add()
1886 * in resize.c
1887 */
1888 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1889 {
1890 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1891
1892 smp_rmb();
1893 return ngroups;
1894 }
1895
1896 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1897 ext4_group_t block_group)
1898 {
1899 return block_group >> sbi->s_log_groups_per_flex;
1900 }
1901
1902 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1903 {
1904 return 1 << sbi->s_log_groups_per_flex;
1905 }
1906
1907 #define ext4_std_error(sb, errno) \
1908 do { \
1909 if ((errno)) \
1910 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
1911 } while (0)
1912
1913 #ifdef CONFIG_SMP
1914 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1915 * counters. So we need to make sure we have free blocks more
1916 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1917 */
1918 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1919 #else
1920 #define EXT4_FREEBLOCKS_WATERMARK 0
1921 #endif
1922
1923 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1924 {
1925 /*
1926 * XXX: replace with spinlock if seen contended -bzzz
1927 */
1928 down_write(&EXT4_I(inode)->i_data_sem);
1929 if (newsize > EXT4_I(inode)->i_disksize)
1930 EXT4_I(inode)->i_disksize = newsize;
1931 up_write(&EXT4_I(inode)->i_data_sem);
1932 return ;
1933 }
1934
1935 struct ext4_group_info {
1936 unsigned long bb_state;
1937 struct rb_root bb_free_root;
1938 ext4_grpblk_t bb_first_free; /* first free block */
1939 ext4_grpblk_t bb_free; /* total free blocks */
1940 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
1941 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
1942 struct list_head bb_prealloc_list;
1943 #ifdef DOUBLE_CHECK
1944 void *bb_bitmap;
1945 #endif
1946 struct rw_semaphore alloc_sem;
1947 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1948 * regions, index is order.
1949 * bb_counters[3] = 5 means
1950 * 5 free 8-block regions. */
1951 };
1952
1953 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1954
1955 #define EXT4_MB_GRP_NEED_INIT(grp) \
1956 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1957
1958 #define EXT4_MAX_CONTENTION 8
1959 #define EXT4_CONTENTION_THRESHOLD 2
1960
1961 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1962 ext4_group_t group)
1963 {
1964 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1965 }
1966
1967 /*
1968 * Returns true if the filesystem is busy enough that attempts to
1969 * access the block group locks has run into contention.
1970 */
1971 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1972 {
1973 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1974 }
1975
1976 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1977 {
1978 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1979 if (spin_trylock(lock))
1980 /*
1981 * We're able to grab the lock right away, so drop the
1982 * lock contention counter.
1983 */
1984 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1985 else {
1986 /*
1987 * The lock is busy, so bump the contention counter,
1988 * and then wait on the spin lock.
1989 */
1990 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1991 EXT4_MAX_CONTENTION);
1992 spin_lock(lock);
1993 }
1994 }
1995
1996 static inline void ext4_unlock_group(struct super_block *sb,
1997 ext4_group_t group)
1998 {
1999 spin_unlock(ext4_group_lock_ptr(sb, group));
2000 }
2001
2002 static inline void ext4_mark_super_dirty(struct super_block *sb)
2003 {
2004 if (EXT4_SB(sb)->s_journal == NULL)
2005 sb->s_dirt =1;
2006 }
2007
2008 /*
2009 * Inodes and files operations
2010 */
2011
2012 /* dir.c */
2013 extern const struct file_operations ext4_dir_operations;
2014
2015 /* file.c */
2016 extern const struct inode_operations ext4_file_inode_operations;
2017 extern const struct file_operations ext4_file_operations;
2018 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2019
2020 /* namei.c */
2021 extern const struct inode_operations ext4_dir_inode_operations;
2022 extern const struct inode_operations ext4_special_inode_operations;
2023 extern struct dentry *ext4_get_parent(struct dentry *child);
2024
2025 /* symlink.c */
2026 extern const struct inode_operations ext4_symlink_inode_operations;
2027 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2028
2029 /* block_validity */
2030 extern void ext4_release_system_zone(struct super_block *sb);
2031 extern int ext4_setup_system_zone(struct super_block *sb);
2032 extern int __init ext4_init_system_zone(void);
2033 extern void ext4_exit_system_zone(void);
2034 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2035 ext4_fsblk_t start_blk,
2036 unsigned int count);
2037
2038 /* extents.c */
2039 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2040 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2041 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
2042 int chunk);
2043 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2044 struct ext4_map_blocks *map, int flags);
2045 extern void ext4_ext_truncate(struct inode *);
2046 extern void ext4_ext_init(struct super_block *);
2047 extern void ext4_ext_release(struct super_block *);
2048 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
2049 loff_t len);
2050 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
2051 ssize_t len);
2052 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2053 struct ext4_map_blocks *map, int flags);
2054 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2055 __u64 start, __u64 len);
2056 /* move_extent.c */
2057 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2058 __u64 start_orig, __u64 start_donor,
2059 __u64 len, __u64 *moved_len);
2060
2061 /* page-io.c */
2062 extern int __init ext4_init_pageio(void);
2063 extern void ext4_exit_pageio(void);
2064 extern void ext4_ioend_wait(struct inode *);
2065 extern void ext4_free_io_end(ext4_io_end_t *io);
2066 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2067 extern int ext4_end_io_nolock(ext4_io_end_t *io);
2068 extern void ext4_io_submit(struct ext4_io_submit *io);
2069 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2070 struct page *page,
2071 int len,
2072 struct writeback_control *wbc);
2073
2074 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2075 enum ext4_state_bits {
2076 BH_Uninit /* blocks are allocated but uninitialized on disk */
2077 = BH_JBDPrivateStart,
2078 };
2079
2080 BUFFER_FNS(Uninit, uninit)
2081 TAS_BUFFER_FNS(Uninit, uninit)
2082
2083 /*
2084 * Add new method to test wether block and inode bitmaps are properly
2085 * initialized. With uninit_bg reading the block from disk is not enough
2086 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2087 */
2088 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2089
2090 static inline int bitmap_uptodate(struct buffer_head *bh)
2091 {
2092 return (buffer_uptodate(bh) &&
2093 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2094 }
2095 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2096 {
2097 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2098 }
2099
2100 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2101
2102 #endif /* __KERNEL__ */
2103
2104 #endif /* _EXT4_H */