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ext4: Make fsync sync new parent directories in no-journal mode
[linux-2.6.git] / fs / ext4 / ext4.h
blob60bd31026e7cf196086c99b9ad2d6ea9edbae04e
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(__func__, (inode), (fmt), ## a)
61
62 #define EXT4_ERROR_FILE(file, fmt, a...) \
63 ext4_error_file(__func__, (file), (fmt), ## a)
64
65 /* data type for block offset of block group */
66 typedef int ext4_grpblk_t;
67
68 /* data type for filesystem-wide blocks number */
69 typedef unsigned long long ext4_fsblk_t;
70
71 /* data type for file logical block number */
72 typedef __u32 ext4_lblk_t;
73
74 /* data type for block group number */
75 typedef unsigned int ext4_group_t;
76
77 /*
78 * Flags used in mballoc's allocation_context flags field.
79 *
80 * Also used to show what's going on for debugging purposes when the
81 * flag field is exported via the traceport interface
82 */
83
84 /* prefer goal again. length */
85 #define EXT4_MB_HINT_MERGE 0x0001
86 /* blocks already reserved */
87 #define EXT4_MB_HINT_RESERVED 0x0002
88 /* metadata is being allocated */
89 #define EXT4_MB_HINT_METADATA 0x0004
90 /* first blocks in the file */
91 #define EXT4_MB_HINT_FIRST 0x0008
92 /* search for the best chunk */
93 #define EXT4_MB_HINT_BEST 0x0010
94 /* data is being allocated */
95 #define EXT4_MB_HINT_DATA 0x0020
96 /* don't preallocate (for tails) */
97 #define EXT4_MB_HINT_NOPREALLOC 0x0040
98 /* allocate for locality group */
99 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
100 /* allocate goal blocks or none */
101 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
102 /* goal is meaningful */
103 #define EXT4_MB_HINT_TRY_GOAL 0x0200
104 /* blocks already pre-reserved by delayed allocation */
105 #define EXT4_MB_DELALLOC_RESERVED 0x0400
106 /* We are doing stream allocation */
107 #define EXT4_MB_STREAM_ALLOC 0x0800
108
109
110 struct ext4_allocation_request {
111 /* target inode for block we're allocating */
112 struct inode *inode;
113 /* how many blocks we want to allocate */
114 unsigned int len;
115 /* logical block in target inode */
116 ext4_lblk_t logical;
117 /* the closest logical allocated block to the left */
118 ext4_lblk_t lleft;
119 /* the closest logical allocated block to the right */
120 ext4_lblk_t lright;
121 /* phys. target (a hint) */
122 ext4_fsblk_t goal;
123 /* phys. block for the closest logical allocated block to the left */
124 ext4_fsblk_t pleft;
125 /* phys. block for the closest logical allocated block to the right */
126 ext4_fsblk_t pright;
127 /* flags. see above EXT4_MB_HINT_* */
128 unsigned int flags;
129 };
130
131 /*
132 * Logical to physical block mapping, used by ext4_map_blocks()
133 *
134 * This structure is used to pass requests into ext4_map_blocks() as
135 * well as to store the information returned by ext4_map_blocks(). It
136 * takes less room on the stack than a struct buffer_head.
137 */
138 #define EXT4_MAP_NEW (1 << BH_New)
139 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
140 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
141 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
142 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
143 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
144 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
145 EXT4_MAP_UNINIT)
146
147 struct ext4_map_blocks {
148 ext4_fsblk_t m_pblk;
149 ext4_lblk_t m_lblk;
150 unsigned int m_len;
151 unsigned int m_flags;
152 };
153
154 /*
155 * For delayed allocation tracking
156 */
157 struct mpage_da_data {
158 struct inode *inode;
159 sector_t b_blocknr; /* start block number of extent */
160 size_t b_size; /* size of extent */
161 unsigned long b_state; /* state of the extent */
162 unsigned long first_page, next_page; /* extent of pages */
163 struct writeback_control *wbc;
164 int io_done;
165 int pages_written;
166 int retval;
167 };
168 #define EXT4_IO_UNWRITTEN 0x1
169 typedef struct ext4_io_end {
170 struct list_head list; /* per-file finished AIO list */
171 struct inode *inode; /* file being written to */
172 unsigned int flag; /* unwritten or not */
173 struct page *page; /* page struct for buffer write */
174 loff_t offset; /* offset in the file */
175 ssize_t size; /* size of the extent */
176 struct work_struct work; /* data work queue */
177 } ext4_io_end_t;
178
179 /*
180 * Special inodes numbers
181 */
182 #define EXT4_BAD_INO 1 /* Bad blocks inode */
183 #define EXT4_ROOT_INO 2 /* Root inode */
184 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
185 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
186 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
187 #define EXT4_JOURNAL_INO 8 /* Journal inode */
188
189 /* First non-reserved inode for old ext4 filesystems */
190 #define EXT4_GOOD_OLD_FIRST_INO 11
191
192 /*
193 * Maximal count of links to a file
194 */
195 #define EXT4_LINK_MAX 65000
196
197 /*
198 * Macro-instructions used to manage several block sizes
199 */
200 #define EXT4_MIN_BLOCK_SIZE 1024
201 #define EXT4_MAX_BLOCK_SIZE 65536
202 #define EXT4_MIN_BLOCK_LOG_SIZE 10
203 #ifdef __KERNEL__
204 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
205 #else
206 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
207 #endif
208 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
209 #ifdef __KERNEL__
210 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
211 #else
212 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
213 #endif
214 #ifdef __KERNEL__
215 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
216 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
217 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
218 #else
219 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
220 EXT4_GOOD_OLD_INODE_SIZE : \
221 (s)->s_inode_size)
222 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
223 EXT4_GOOD_OLD_FIRST_INO : \
224 (s)->s_first_ino)
225 #endif
226 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
227
228 /*
229 * Structure of a blocks group descriptor
230 */
231 struct ext4_group_desc
232 {
233 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
234 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
235 __le32 bg_inode_table_lo; /* Inodes table block */
236 __le16 bg_free_blocks_count_lo;/* Free blocks count */
237 __le16 bg_free_inodes_count_lo;/* Free inodes count */
238 __le16 bg_used_dirs_count_lo; /* Directories count */
239 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
240 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
241 __le16 bg_itable_unused_lo; /* Unused inodes count */
242 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
243 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
244 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
245 __le32 bg_inode_table_hi; /* Inodes table block MSB */
246 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
247 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
248 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
249 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
250 __u32 bg_reserved2[3];
251 };
252
253 /*
254 * Structure of a flex block group info
255 */
256
257 struct flex_groups {
258 atomic_t free_inodes;
259 atomic_t free_blocks;
260 atomic_t used_dirs;
261 };
262
263 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
264 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
265 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
266
267 /*
268 * Macro-instructions used to manage group descriptors
269 */
270 #define EXT4_MIN_DESC_SIZE 32
271 #define EXT4_MIN_DESC_SIZE_64BIT 64
272 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
273 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
274 #ifdef __KERNEL__
275 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
276 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
277 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
278 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
279 #else
280 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
281 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
282 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
283 #endif
284
285 /*
286 * Constants relative to the data blocks
287 */
288 #define EXT4_NDIR_BLOCKS 12
289 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
290 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
291 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
292 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
293
294 /*
295 * Inode flags
296 */
297 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
298 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
299 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
300 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
301 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
302 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
303 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
304 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
305 /* Reserved for compression usage... */
306 #define EXT4_DIRTY_FL 0x00000100
307 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
308 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
309 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
310 /* End compression flags --- maybe not all used */
311 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
312 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
313 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
314 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
315 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
316 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
317 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
318 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
319 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
320 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
321 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
322
323 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
324 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
325
326 /* Flags that should be inherited by new inodes from their parent. */
327 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
328 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
329 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
330 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
331 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
332
333 /* Flags that are appropriate for regular files (all but dir-specific ones). */
334 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
335
336 /* Flags that are appropriate for non-directories/regular files. */
337 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
338
339 /* Mask out flags that are inappropriate for the given type of inode. */
340 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
341 {
342 if (S_ISDIR(mode))
343 return flags;
344 else if (S_ISREG(mode))
345 return flags & EXT4_REG_FLMASK;
346 else
347 return flags & EXT4_OTHER_FLMASK;
348 }
349
350 /*
351 * Inode flags used for atomic set/get
352 */
353 enum {
354 EXT4_INODE_SECRM = 0, /* Secure deletion */
355 EXT4_INODE_UNRM = 1, /* Undelete */
356 EXT4_INODE_COMPR = 2, /* Compress file */
357 EXT4_INODE_SYNC = 3, /* Synchronous updates */
358 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
359 EXT4_INODE_APPEND = 5, /* writes to file may only append */
360 EXT4_INODE_NODUMP = 6, /* do not dump file */
361 EXT4_INODE_NOATIME = 7, /* do not update atime */
362 /* Reserved for compression usage... */
363 EXT4_INODE_DIRTY = 8,
364 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
365 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
366 EXT4_INODE_ECOMPR = 11, /* Compression error */
367 /* End compression flags --- maybe not all used */
368 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
369 EXT4_INODE_IMAGIC = 13, /* AFS directory */
370 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
371 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
372 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
373 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
374 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
375 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
376 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
377 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
378 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
379 };
380
381 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
382 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
383 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
384 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
385
386 /*
387 * Since it's pretty easy to mix up bit numbers and hex values, and we
388 * can't do a compile-time test for ENUM values, we use a run-time
389 * test to make sure that EXT4_XXX_FL is consistent with respect to
390 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
391 * out so it won't cost any extra space in the compiled kernel image.
392 * But it's important that these values are the same, since we are
393 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
394 * must be consistent with the values of FS_XXX_FL defined in
395 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
396 * ext4 filesystems, and of course the values defined in e2fsprogs.
397 *
398 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
399 */
400 static inline void ext4_check_flag_values(void)
401 {
402 CHECK_FLAG_VALUE(SECRM);
403 CHECK_FLAG_VALUE(UNRM);
404 CHECK_FLAG_VALUE(COMPR);
405 CHECK_FLAG_VALUE(SYNC);
406 CHECK_FLAG_VALUE(IMMUTABLE);
407 CHECK_FLAG_VALUE(APPEND);
408 CHECK_FLAG_VALUE(NODUMP);
409 CHECK_FLAG_VALUE(NOATIME);
410 CHECK_FLAG_VALUE(DIRTY);
411 CHECK_FLAG_VALUE(COMPRBLK);
412 CHECK_FLAG_VALUE(NOCOMPR);
413 CHECK_FLAG_VALUE(ECOMPR);
414 CHECK_FLAG_VALUE(INDEX);
415 CHECK_FLAG_VALUE(IMAGIC);
416 CHECK_FLAG_VALUE(JOURNAL_DATA);
417 CHECK_FLAG_VALUE(NOTAIL);
418 CHECK_FLAG_VALUE(DIRSYNC);
419 CHECK_FLAG_VALUE(TOPDIR);
420 CHECK_FLAG_VALUE(HUGE_FILE);
421 CHECK_FLAG_VALUE(EXTENTS);
422 CHECK_FLAG_VALUE(EA_INODE);
423 CHECK_FLAG_VALUE(EOFBLOCKS);
424 CHECK_FLAG_VALUE(RESERVED);
425 }
426
427 /* Used to pass group descriptor data when online resize is done */
428 struct ext4_new_group_input {
429 __u32 group; /* Group number for this data */
430 __u64 block_bitmap; /* Absolute block number of block bitmap */
431 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
432 __u64 inode_table; /* Absolute block number of inode table start */
433 __u32 blocks_count; /* Total number of blocks in this group */
434 __u16 reserved_blocks; /* Number of reserved blocks in this group */
435 __u16 unused;
436 };
437
438 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
439 struct compat_ext4_new_group_input {
440 u32 group;
441 compat_u64 block_bitmap;
442 compat_u64 inode_bitmap;
443 compat_u64 inode_table;
444 u32 blocks_count;
445 u16 reserved_blocks;
446 u16 unused;
447 };
448 #endif
449
450 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
451 struct ext4_new_group_data {
452 __u32 group;
453 __u64 block_bitmap;
454 __u64 inode_bitmap;
455 __u64 inode_table;
456 __u32 blocks_count;
457 __u16 reserved_blocks;
458 __u16 unused;
459 __u32 free_blocks_count;
460 };
461
462 /*
463 * Flags used by ext4_get_blocks()
464 */
465 /* Allocate any needed blocks and/or convert an unitialized
466 extent to be an initialized ext4 */
467 #define EXT4_GET_BLOCKS_CREATE 0x0001
468 /* Request the creation of an unitialized extent */
469 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
470 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
471 EXT4_GET_BLOCKS_CREATE)
472 /* Caller is from the delayed allocation writeout path,
473 so set the magic i_delalloc_reserve_flag after taking the
474 inode allocation semaphore for */
475 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
476 /* caller is from the direct IO path, request to creation of an
477 unitialized extents if not allocated, split the uninitialized
478 extent if blocks has been preallocated already*/
479 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
480 #define EXT4_GET_BLOCKS_CONVERT 0x0010
481 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
482 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
483 /* Convert extent to initialized after IO complete */
484 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
485 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
486
487 /*
488 * Flags used by ext4_free_blocks
489 */
490 #define EXT4_FREE_BLOCKS_METADATA 0x0001
491 #define EXT4_FREE_BLOCKS_FORGET 0x0002
492 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
493
494 /*
495 * ioctl commands
496 */
497 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
498 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
499 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
500 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
501 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
502 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
503 #ifdef CONFIG_JBD2_DEBUG
504 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
505 #endif
506 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
507 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
508 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
509 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
510 #define EXT4_IOC_MIGRATE _IO('f', 9)
511 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
512 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
513 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
514 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
515
516 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
517 /*
518 * ioctl commands in 32 bit emulation
519 */
520 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
521 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
522 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
523 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
524 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
525 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
526 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
527 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
528 #ifdef CONFIG_JBD2_DEBUG
529 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
530 #endif
531 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
532 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
533 #endif
534
535
536 /*
537 * Mount options
538 */
539 struct ext4_mount_options {
540 unsigned long s_mount_opt;
541 uid_t s_resuid;
542 gid_t s_resgid;
543 unsigned long s_commit_interval;
544 u32 s_min_batch_time, s_max_batch_time;
545 #ifdef CONFIG_QUOTA
546 int s_jquota_fmt;
547 char *s_qf_names[MAXQUOTAS];
548 #endif
549 };
550
551 /* Max physical block we can addres w/o extents */
552 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
553
554 /*
555 * Structure of an inode on the disk
556 */
557 struct ext4_inode {
558 __le16 i_mode; /* File mode */
559 __le16 i_uid; /* Low 16 bits of Owner Uid */
560 __le32 i_size_lo; /* Size in bytes */
561 __le32 i_atime; /* Access time */
562 __le32 i_ctime; /* Inode Change time */
563 __le32 i_mtime; /* Modification time */
564 __le32 i_dtime; /* Deletion Time */
565 __le16 i_gid; /* Low 16 bits of Group Id */
566 __le16 i_links_count; /* Links count */
567 __le32 i_blocks_lo; /* Blocks count */
568 __le32 i_flags; /* File flags */
569 union {
570 struct {
571 __le32 l_i_version;
572 } linux1;
573 struct {
574 __u32 h_i_translator;
575 } hurd1;
576 struct {
577 __u32 m_i_reserved1;
578 } masix1;
579 } osd1; /* OS dependent 1 */
580 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
581 __le32 i_generation; /* File version (for NFS) */
582 __le32 i_file_acl_lo; /* File ACL */
583 __le32 i_size_high;
584 __le32 i_obso_faddr; /* Obsoleted fragment address */
585 union {
586 struct {
587 __le16 l_i_blocks_high; /* were l_i_reserved1 */
588 __le16 l_i_file_acl_high;
589 __le16 l_i_uid_high; /* these 2 fields */
590 __le16 l_i_gid_high; /* were reserved2[0] */
591 __u32 l_i_reserved2;
592 } linux2;
593 struct {
594 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
595 __u16 h_i_mode_high;
596 __u16 h_i_uid_high;
597 __u16 h_i_gid_high;
598 __u32 h_i_author;
599 } hurd2;
600 struct {
601 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
602 __le16 m_i_file_acl_high;
603 __u32 m_i_reserved2[2];
604 } masix2;
605 } osd2; /* OS dependent 2 */
606 __le16 i_extra_isize;
607 __le16 i_pad1;
608 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
609 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
610 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
611 __le32 i_crtime; /* File Creation time */
612 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
613 __le32 i_version_hi; /* high 32 bits for 64-bit version */
614 };
615
616 struct move_extent {
617 __u32 reserved; /* should be zero */
618 __u32 donor_fd; /* donor file descriptor */
619 __u64 orig_start; /* logical start offset in block for orig */
620 __u64 donor_start; /* logical start offset in block for donor */
621 __u64 len; /* block length to be moved */
622 __u64 moved_len; /* moved block length */
623 };
624
625 #define EXT4_EPOCH_BITS 2
626 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
627 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
628
629 /*
630 * Extended fields will fit into an inode if the filesystem was formatted
631 * with large inodes (-I 256 or larger) and there are not currently any EAs
632 * consuming all of the available space. For new inodes we always reserve
633 * enough space for the kernel's known extended fields, but for inodes
634 * created with an old kernel this might not have been the case. None of
635 * the extended inode fields is critical for correct filesystem operation.
636 * This macro checks if a certain field fits in the inode. Note that
637 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
638 */
639 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
640 ((offsetof(typeof(*ext4_inode), field) + \
641 sizeof((ext4_inode)->field)) \
642 <= (EXT4_GOOD_OLD_INODE_SIZE + \
643 (einode)->i_extra_isize)) \
644
645 static inline __le32 ext4_encode_extra_time(struct timespec *time)
646 {
647 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
648 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
649 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
650 }
651
652 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
653 {
654 if (sizeof(time->tv_sec) > 4)
655 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
656 << 32;
657 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
658 }
659
660 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
661 do { \
662 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
663 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
664 (raw_inode)->xtime ## _extra = \
665 ext4_encode_extra_time(&(inode)->xtime); \
666 } while (0)
667
668 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
669 do { \
670 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
671 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
672 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
673 (raw_inode)->xtime ## _extra = \
674 ext4_encode_extra_time(&(einode)->xtime); \
675 } while (0)
676
677 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
678 do { \
679 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
680 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
681 ext4_decode_extra_time(&(inode)->xtime, \
682 raw_inode->xtime ## _extra); \
683 } while (0)
684
685 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
686 do { \
687 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
688 (einode)->xtime.tv_sec = \
689 (signed)le32_to_cpu((raw_inode)->xtime); \
690 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
691 ext4_decode_extra_time(&(einode)->xtime, \
692 raw_inode->xtime ## _extra); \
693 } while (0)
694
695 #define i_disk_version osd1.linux1.l_i_version
696
697 #if defined(__KERNEL__) || defined(__linux__)
698 #define i_reserved1 osd1.linux1.l_i_reserved1
699 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
700 #define i_blocks_high osd2.linux2.l_i_blocks_high
701 #define i_uid_low i_uid
702 #define i_gid_low i_gid
703 #define i_uid_high osd2.linux2.l_i_uid_high
704 #define i_gid_high osd2.linux2.l_i_gid_high
705 #define i_reserved2 osd2.linux2.l_i_reserved2
706
707 #elif defined(__GNU__)
708
709 #define i_translator osd1.hurd1.h_i_translator
710 #define i_uid_high osd2.hurd2.h_i_uid_high
711 #define i_gid_high osd2.hurd2.h_i_gid_high
712 #define i_author osd2.hurd2.h_i_author
713
714 #elif defined(__masix__)
715
716 #define i_reserved1 osd1.masix1.m_i_reserved1
717 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
718 #define i_reserved2 osd2.masix2.m_i_reserved2
719
720 #endif /* defined(__KERNEL__) || defined(__linux__) */
721
722 /*
723 * storage for cached extent
724 */
725 struct ext4_ext_cache {
726 ext4_fsblk_t ec_start;
727 ext4_lblk_t ec_block;
728 __u32 ec_len; /* must be 32bit to return holes */
729 __u32 ec_type;
730 };
731
732 /*
733 * fourth extended file system inode data in memory
734 */
735 struct ext4_inode_info {
736 __le32 i_data[15]; /* unconverted */
737 __u32 i_dtime;
738 ext4_fsblk_t i_file_acl;
739
740 /*
741 * i_block_group is the number of the block group which contains
742 * this file's inode. Constant across the lifetime of the inode,
743 * it is ued for making block allocation decisions - we try to
744 * place a file's data blocks near its inode block, and new inodes
745 * near to their parent directory's inode.
746 */
747 ext4_group_t i_block_group;
748 unsigned long i_state_flags; /* Dynamic state flags */
749 unsigned long i_flags;
750
751 ext4_lblk_t i_dir_start_lookup;
752 #ifdef CONFIG_EXT4_FS_XATTR
753 /*
754 * Extended attributes can be read independently of the main file
755 * data. Taking i_mutex even when reading would cause contention
756 * between readers of EAs and writers of regular file data, so
757 * instead we synchronize on xattr_sem when reading or changing
758 * EAs.
759 */
760 struct rw_semaphore xattr_sem;
761 #endif
762
763 struct list_head i_orphan; /* unlinked but open inodes */
764
765 /*
766 * i_disksize keeps track of what the inode size is ON DISK, not
767 * in memory. During truncate, i_size is set to the new size by
768 * the VFS prior to calling ext4_truncate(), but the filesystem won't
769 * set i_disksize to 0 until the truncate is actually under way.
770 *
771 * The intent is that i_disksize always represents the blocks which
772 * are used by this file. This allows recovery to restart truncate
773 * on orphans if we crash during truncate. We actually write i_disksize
774 * into the on-disk inode when writing inodes out, instead of i_size.
775 *
776 * The only time when i_disksize and i_size may be different is when
777 * a truncate is in progress. The only things which change i_disksize
778 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
779 */
780 loff_t i_disksize;
781
782 /*
783 * i_data_sem is for serialising ext4_truncate() against
784 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
785 * data tree are chopped off during truncate. We can't do that in
786 * ext4 because whenever we perform intermediate commits during
787 * truncate, the inode and all the metadata blocks *must* be in a
788 * consistent state which allows truncation of the orphans to restart
789 * during recovery. Hence we must fix the get_block-vs-truncate race
790 * by other means, so we have i_data_sem.
791 */
792 struct rw_semaphore i_data_sem;
793 struct inode vfs_inode;
794 struct jbd2_inode jinode;
795
796 struct ext4_ext_cache i_cached_extent;
797 /*
798 * File creation time. Its function is same as that of
799 * struct timespec i_{a,c,m}time in the generic inode.
800 */
801 struct timespec i_crtime;
802
803 /* mballoc */
804 struct list_head i_prealloc_list;
805 spinlock_t i_prealloc_lock;
806
807 /* ialloc */
808 ext4_group_t i_last_alloc_group;
809
810 /* allocation reservation info for delalloc */
811 unsigned int i_reserved_data_blocks;
812 unsigned int i_reserved_meta_blocks;
813 unsigned int i_allocated_meta_blocks;
814 unsigned short i_delalloc_reserved_flag;
815 sector_t i_da_metadata_calc_last_lblock;
816 int i_da_metadata_calc_len;
817
818 /* on-disk additional length */
819 __u16 i_extra_isize;
820
821 spinlock_t i_block_reservation_lock;
822 #ifdef CONFIG_QUOTA
823 /* quota space reservation, managed internally by quota code */
824 qsize_t i_reserved_quota;
825 #endif
826
827 /* completed IOs that might need unwritten extents handling */
828 struct list_head i_completed_io_list;
829 spinlock_t i_completed_io_lock;
830 /* current io_end structure for async DIO write*/
831 ext4_io_end_t *cur_aio_dio;
832
833 /*
834 * Transactions that contain inode's metadata needed to complete
835 * fsync and fdatasync, respectively.
836 */
837 tid_t i_sync_tid;
838 tid_t i_datasync_tid;
839 };
840
841 /*
842 * File system states
843 */
844 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
845 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
846 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
847
848 /*
849 * Misc. filesystem flags
850 */
851 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
852 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
853 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
854
855 /*
856 * Mount flags
857 */
858 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
859 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
860 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
861 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
862 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
863 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
864 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
865 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
866 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
867 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
868 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
869 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
870 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
871 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
872 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
873 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
874 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
875 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
876 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
877 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
878 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
879 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
880 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
881 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
882 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
883 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
884 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
885 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
886 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
887 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
888
889 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
890 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
891 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
892 EXT4_MOUNT_##opt)
893
894 #define ext4_set_bit ext2_set_bit
895 #define ext4_set_bit_atomic ext2_set_bit_atomic
896 #define ext4_clear_bit ext2_clear_bit
897 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
898 #define ext4_test_bit ext2_test_bit
899 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
900 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
901 #define ext4_find_next_bit ext2_find_next_bit
902
903 /*
904 * Maximal mount counts between two filesystem checks
905 */
906 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
907 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
908
909 /*
910 * Behaviour when detecting errors
911 */
912 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
913 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
914 #define EXT4_ERRORS_PANIC 3 /* Panic */
915 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
916
917 /*
918 * Structure of the super block
919 */
920 struct ext4_super_block {
921 /*00*/ __le32 s_inodes_count; /* Inodes count */
922 __le32 s_blocks_count_lo; /* Blocks count */
923 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
924 __le32 s_free_blocks_count_lo; /* Free blocks count */
925 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
926 __le32 s_first_data_block; /* First Data Block */
927 __le32 s_log_block_size; /* Block size */
928 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
929 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
930 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
931 __le32 s_inodes_per_group; /* # Inodes per group */
932 __le32 s_mtime; /* Mount time */
933 /*30*/ __le32 s_wtime; /* Write time */
934 __le16 s_mnt_count; /* Mount count */
935 __le16 s_max_mnt_count; /* Maximal mount count */
936 __le16 s_magic; /* Magic signature */
937 __le16 s_state; /* File system state */
938 __le16 s_errors; /* Behaviour when detecting errors */
939 __le16 s_minor_rev_level; /* minor revision level */
940 /*40*/ __le32 s_lastcheck; /* time of last check */
941 __le32 s_checkinterval; /* max. time between checks */
942 __le32 s_creator_os; /* OS */
943 __le32 s_rev_level; /* Revision level */
944 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
945 __le16 s_def_resgid; /* Default gid for reserved blocks */
946 /*
947 * These fields are for EXT4_DYNAMIC_REV superblocks only.
948 *
949 * Note: the difference between the compatible feature set and
950 * the incompatible feature set is that if there is a bit set
951 * in the incompatible feature set that the kernel doesn't
952 * know about, it should refuse to mount the filesystem.
953 *
954 * e2fsck's requirements are more strict; if it doesn't know
955 * about a feature in either the compatible or incompatible
956 * feature set, it must abort and not try to meddle with
957 * things it doesn't understand...
958 */
959 __le32 s_first_ino; /* First non-reserved inode */
960 __le16 s_inode_size; /* size of inode structure */
961 __le16 s_block_group_nr; /* block group # of this superblock */
962 __le32 s_feature_compat; /* compatible feature set */
963 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
964 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
965 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
966 /*78*/ char s_volume_name[16]; /* volume name */
967 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
968 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
969 /*
970 * Performance hints. Directory preallocation should only
971 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
972 */
973 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
974 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
975 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
976 /*
977 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
978 */
979 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
980 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
981 __le32 s_journal_dev; /* device number of journal file */
982 __le32 s_last_orphan; /* start of list of inodes to delete */
983 __le32 s_hash_seed[4]; /* HTREE hash seed */
984 __u8 s_def_hash_version; /* Default hash version to use */
985 __u8 s_reserved_char_pad;
986 __le16 s_desc_size; /* size of group descriptor */
987 /*100*/ __le32 s_default_mount_opts;
988 __le32 s_first_meta_bg; /* First metablock block group */
989 __le32 s_mkfs_time; /* When the filesystem was created */
990 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
991 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
992 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
993 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
994 __le32 s_free_blocks_count_hi; /* Free blocks count */
995 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
996 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
997 __le32 s_flags; /* Miscellaneous flags */
998 __le16 s_raid_stride; /* RAID stride */
999 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
1000 __le64 s_mmp_block; /* Block for multi-mount protection */
1001 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1002 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1003 __u8 s_reserved_char_pad2;
1004 __le16 s_reserved_pad;
1005 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1006 __u32 s_reserved[160]; /* Padding to the end of the block */
1007 };
1008
1009 #ifdef __KERNEL__
1010
1011 /*
1012 * run-time mount flags
1013 */
1014 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1015 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1016
1017 /*
1018 * fourth extended-fs super-block data in memory
1019 */
1020 struct ext4_sb_info {
1021 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1022 unsigned long s_inodes_per_block;/* Number of inodes per block */
1023 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1024 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1025 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1026 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1027 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1028 ext4_group_t s_groups_count; /* Number of groups in the fs */
1029 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1030 unsigned long s_overhead_last; /* Last calculated overhead */
1031 unsigned long s_blocks_last; /* Last seen block count */
1032 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1033 struct buffer_head * s_sbh; /* Buffer containing the super block */
1034 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1035 struct buffer_head **s_group_desc;
1036 unsigned int s_mount_opt;
1037 unsigned int s_mount_flags;
1038 ext4_fsblk_t s_sb_block;
1039 uid_t s_resuid;
1040 gid_t s_resgid;
1041 unsigned short s_mount_state;
1042 unsigned short s_pad;
1043 int s_addr_per_block_bits;
1044 int s_desc_per_block_bits;
1045 int s_inode_size;
1046 int s_first_ino;
1047 unsigned int s_inode_readahead_blks;
1048 unsigned int s_inode_goal;
1049 spinlock_t s_next_gen_lock;
1050 u32 s_next_generation;
1051 u32 s_hash_seed[4];
1052 int s_def_hash_version;
1053 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1054 struct percpu_counter s_freeblocks_counter;
1055 struct percpu_counter s_freeinodes_counter;
1056 struct percpu_counter s_dirs_counter;
1057 struct percpu_counter s_dirtyblocks_counter;
1058 struct blockgroup_lock *s_blockgroup_lock;
1059 struct proc_dir_entry *s_proc;
1060 struct kobject s_kobj;
1061 struct completion s_kobj_unregister;
1062
1063 /* Journaling */
1064 struct inode *s_journal_inode;
1065 struct journal_s *s_journal;
1066 struct list_head s_orphan;
1067 struct mutex s_orphan_lock;
1068 struct mutex s_resize_lock;
1069 unsigned long s_commit_interval;
1070 u32 s_max_batch_time;
1071 u32 s_min_batch_time;
1072 struct block_device *journal_bdev;
1073 #ifdef CONFIG_JBD2_DEBUG
1074 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1075 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1076 #endif
1077 #ifdef CONFIG_QUOTA
1078 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1079 int s_jquota_fmt; /* Format of quota to use */
1080 #endif
1081 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1082 struct rb_root system_blks;
1083
1084 #ifdef EXTENTS_STATS
1085 /* ext4 extents stats */
1086 unsigned long s_ext_min;
1087 unsigned long s_ext_max;
1088 unsigned long s_depth_max;
1089 spinlock_t s_ext_stats_lock;
1090 unsigned long s_ext_blocks;
1091 unsigned long s_ext_extents;
1092 #endif
1093
1094 /* for buddy allocator */
1095 struct ext4_group_info ***s_group_info;
1096 struct inode *s_buddy_cache;
1097 long s_blocks_reserved;
1098 spinlock_t s_reserve_lock;
1099 spinlock_t s_md_lock;
1100 tid_t s_last_transaction;
1101 unsigned short *s_mb_offsets;
1102 unsigned int *s_mb_maxs;
1103
1104 /* tunables */
1105 unsigned long s_stripe;
1106 unsigned int s_mb_stream_request;
1107 unsigned int s_mb_max_to_scan;
1108 unsigned int s_mb_min_to_scan;
1109 unsigned int s_mb_stats;
1110 unsigned int s_mb_order2_reqs;
1111 unsigned int s_mb_group_prealloc;
1112 unsigned int s_max_writeback_mb_bump;
1113 /* where last allocation was done - for stream allocation */
1114 unsigned long s_mb_last_group;
1115 unsigned long s_mb_last_start;
1116
1117 /* stats for buddy allocator */
1118 spinlock_t s_mb_pa_lock;
1119 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1120 atomic_t s_bal_success; /* we found long enough chunks */
1121 atomic_t s_bal_allocated; /* in blocks */
1122 atomic_t s_bal_ex_scanned; /* total extents scanned */
1123 atomic_t s_bal_goals; /* goal hits */
1124 atomic_t s_bal_breaks; /* too long searches */
1125 atomic_t s_bal_2orders; /* 2^order hits */
1126 spinlock_t s_bal_lock;
1127 unsigned long s_mb_buddies_generated;
1128 unsigned long long s_mb_generation_time;
1129 atomic_t s_mb_lost_chunks;
1130 atomic_t s_mb_preallocated;
1131 atomic_t s_mb_discarded;
1132 atomic_t s_lock_busy;
1133
1134 /* locality groups */
1135 struct ext4_locality_group __percpu *s_locality_groups;
1136
1137 /* for write statistics */
1138 unsigned long s_sectors_written_start;
1139 u64 s_kbytes_written;
1140
1141 unsigned int s_log_groups_per_flex;
1142 struct flex_groups *s_flex_groups;
1143
1144 /* workqueue for dio unwritten */
1145 struct workqueue_struct *dio_unwritten_wq;
1146 };
1147
1148 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1149 {
1150 return sb->s_fs_info;
1151 }
1152 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1153 {
1154 return container_of(inode, struct ext4_inode_info, vfs_inode);
1155 }
1156
1157 static inline struct timespec ext4_current_time(struct inode *inode)
1158 {
1159 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1160 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1161 }
1162
1163 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1164 {
1165 return ino == EXT4_ROOT_INO ||
1166 ino == EXT4_JOURNAL_INO ||
1167 ino == EXT4_RESIZE_INO ||
1168 (ino >= EXT4_FIRST_INO(sb) &&
1169 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1170 }
1171
1172 /*
1173 * Inode dynamic state flags
1174 */
1175 enum {
1176 EXT4_STATE_JDATA, /* journaled data exists */
1177 EXT4_STATE_NEW, /* inode is newly created */
1178 EXT4_STATE_XATTR, /* has in-inode xattrs */
1179 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1180 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1181 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1182 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1183 EXT4_STATE_NEWENTRY, /* File just added to dir */
1184 };
1185
1186 #define EXT4_INODE_BIT_FNS(name, field) \
1187 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1188 { \
1189 return test_bit(bit, &EXT4_I(inode)->i_##field); \
1190 } \
1191 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1192 { \
1193 set_bit(bit, &EXT4_I(inode)->i_##field); \
1194 } \
1195 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1196 { \
1197 clear_bit(bit, &EXT4_I(inode)->i_##field); \
1198 }
1199
1200 EXT4_INODE_BIT_FNS(flag, flags)
1201 EXT4_INODE_BIT_FNS(state, state_flags)
1202 #else
1203 /* Assume that user mode programs are passing in an ext4fs superblock, not
1204 * a kernel struct super_block. This will allow us to call the feature-test
1205 * macros from user land. */
1206 #define EXT4_SB(sb) (sb)
1207 #endif
1208
1209 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1210
1211 /*
1212 * Codes for operating systems
1213 */
1214 #define EXT4_OS_LINUX 0
1215 #define EXT4_OS_HURD 1
1216 #define EXT4_OS_MASIX 2
1217 #define EXT4_OS_FREEBSD 3
1218 #define EXT4_OS_LITES 4
1219
1220 /*
1221 * Revision levels
1222 */
1223 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1224 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1225
1226 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1227 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1228
1229 #define EXT4_GOOD_OLD_INODE_SIZE 128
1230
1231 /*
1232 * Feature set definitions
1233 */
1234
1235 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1236 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1237 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1238 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1239 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1240 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1241 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1242 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1243 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1244 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1245 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1246 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1247 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1248 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1249 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1250 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1251 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1252 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1253
1254 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1255 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1256 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1257 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1258 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1259 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1260
1261 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1262 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1263 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1264 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1265 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1266 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1267 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1268
1269 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1270 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1271 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1272 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1273 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1274 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1275 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1276 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1277 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1278 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1279 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1280
1281 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1282 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1283 EXT4_FEATURE_INCOMPAT_RECOVER| \
1284 EXT4_FEATURE_INCOMPAT_META_BG| \
1285 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1286 EXT4_FEATURE_INCOMPAT_64BIT| \
1287 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1288 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1289 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1290 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1291 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1292 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1293 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1294 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1295
1296 /*
1297 * Default values for user and/or group using reserved blocks
1298 */
1299 #define EXT4_DEF_RESUID 0
1300 #define EXT4_DEF_RESGID 0
1301
1302 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1303
1304 /*
1305 * Default mount options
1306 */
1307 #define EXT4_DEFM_DEBUG 0x0001
1308 #define EXT4_DEFM_BSDGROUPS 0x0002
1309 #define EXT4_DEFM_XATTR_USER 0x0004
1310 #define EXT4_DEFM_ACL 0x0008
1311 #define EXT4_DEFM_UID16 0x0010
1312 #define EXT4_DEFM_JMODE 0x0060
1313 #define EXT4_DEFM_JMODE_DATA 0x0020
1314 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1315 #define EXT4_DEFM_JMODE_WBACK 0x0060
1316
1317 /*
1318 * Default journal batch times
1319 */
1320 #define EXT4_DEF_MIN_BATCH_TIME 0
1321 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1322
1323 /*
1324 * Minimum number of groups in a flexgroup before we separate out
1325 * directories into the first block group of a flexgroup
1326 */
1327 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1328
1329 /*
1330 * Structure of a directory entry
1331 */
1332 #define EXT4_NAME_LEN 255
1333
1334 struct ext4_dir_entry {
1335 __le32 inode; /* Inode number */
1336 __le16 rec_len; /* Directory entry length */
1337 __le16 name_len; /* Name length */
1338 char name[EXT4_NAME_LEN]; /* File name */
1339 };
1340
1341 /*
1342 * The new version of the directory entry. Since EXT4 structures are
1343 * stored in intel byte order, and the name_len field could never be
1344 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1345 * file_type field.
1346 */
1347 struct ext4_dir_entry_2 {
1348 __le32 inode; /* Inode number */
1349 __le16 rec_len; /* Directory entry length */
1350 __u8 name_len; /* Name length */
1351 __u8 file_type;
1352 char name[EXT4_NAME_LEN]; /* File name */
1353 };
1354
1355 /*
1356 * Ext4 directory file types. Only the low 3 bits are used. The
1357 * other bits are reserved for now.
1358 */
1359 #define EXT4_FT_UNKNOWN 0
1360 #define EXT4_FT_REG_FILE 1
1361 #define EXT4_FT_DIR 2
1362 #define EXT4_FT_CHRDEV 3
1363 #define EXT4_FT_BLKDEV 4
1364 #define EXT4_FT_FIFO 5
1365 #define EXT4_FT_SOCK 6
1366 #define EXT4_FT_SYMLINK 7
1367
1368 #define EXT4_FT_MAX 8
1369
1370 /*
1371 * EXT4_DIR_PAD defines the directory entries boundaries
1372 *
1373 * NOTE: It must be a multiple of 4
1374 */
1375 #define EXT4_DIR_PAD 4
1376 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1377 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1378 ~EXT4_DIR_ROUND)
1379 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1380
1381 /*
1382 * Hash Tree Directory indexing
1383 * (c) Daniel Phillips, 2001
1384 */
1385
1386 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1387 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1388 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1389 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1390 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1391
1392 /* Legal values for the dx_root hash_version field: */
1393
1394 #define DX_HASH_LEGACY 0
1395 #define DX_HASH_HALF_MD4 1
1396 #define DX_HASH_TEA 2
1397 #define DX_HASH_LEGACY_UNSIGNED 3
1398 #define DX_HASH_HALF_MD4_UNSIGNED 4
1399 #define DX_HASH_TEA_UNSIGNED 5
1400
1401 #ifdef __KERNEL__
1402
1403 /* hash info structure used by the directory hash */
1404 struct dx_hash_info
1405 {
1406 u32 hash;
1407 u32 minor_hash;
1408 int hash_version;
1409 u32 *seed;
1410 };
1411
1412 #define EXT4_HTREE_EOF 0x7fffffff
1413
1414 /*
1415 * Control parameters used by ext4_htree_next_block
1416 */
1417 #define HASH_NB_ALWAYS 1
1418
1419
1420 /*
1421 * Describe an inode's exact location on disk and in memory
1422 */
1423 struct ext4_iloc
1424 {
1425 struct buffer_head *bh;
1426 unsigned long offset;
1427 ext4_group_t block_group;
1428 };
1429
1430 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1431 {
1432 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1433 }
1434
1435 /*
1436 * This structure is stuffed into the struct file's private_data field
1437 * for directories. It is where we put information so that we can do
1438 * readdir operations in hash tree order.
1439 */
1440 struct dir_private_info {
1441 struct rb_root root;
1442 struct rb_node *curr_node;
1443 struct fname *extra_fname;
1444 loff_t last_pos;
1445 __u32 curr_hash;
1446 __u32 curr_minor_hash;
1447 __u32 next_hash;
1448 };
1449
1450 /* calculate the first block number of the group */
1451 static inline ext4_fsblk_t
1452 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1453 {
1454 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1455 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1456 }
1457
1458 /*
1459 * Special error return code only used by dx_probe() and its callers.
1460 */
1461 #define ERR_BAD_DX_DIR -75000
1462
1463 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1464 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1465
1466 extern struct proc_dir_entry *ext4_proc_root;
1467
1468 /*
1469 * Function prototypes
1470 */
1471
1472 /*
1473 * Ok, these declarations are also in <linux/kernel.h> but none of the
1474 * ext4 source programs needs to include it so they are duplicated here.
1475 */
1476 # define NORET_TYPE /**/
1477 # define ATTRIB_NORET __attribute__((noreturn))
1478 # define NORET_AND noreturn,
1479
1480 /* bitmap.c */
1481 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1482
1483 /* balloc.c */
1484 extern unsigned int ext4_block_group(struct super_block *sb,
1485 ext4_fsblk_t blocknr);
1486 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1487 ext4_fsblk_t blocknr);
1488 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1489 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1490 ext4_group_t group);
1491 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1492 ext4_fsblk_t goal, unsigned long *count, int *errp);
1493 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1494 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1495 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1496 ext4_fsblk_t block, unsigned long count);
1497 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1498 extern void ext4_check_blocks_bitmap(struct super_block *);
1499 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1500 ext4_group_t block_group,
1501 struct buffer_head ** bh);
1502 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1503 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1504 ext4_group_t block_group);
1505 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1506 struct buffer_head *bh,
1507 ext4_group_t group,
1508 struct ext4_group_desc *desc);
1509 #define ext4_free_blocks_after_init(sb, group, desc) \
1510 ext4_init_block_bitmap(sb, NULL, group, desc)
1511
1512 /* dir.c */
1513 extern int ext4_check_dir_entry(const char *, struct inode *,
1514 struct ext4_dir_entry_2 *,
1515 struct buffer_head *, unsigned int);
1516 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1517 __u32 minor_hash,
1518 struct ext4_dir_entry_2 *dirent);
1519 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1520
1521 /* fsync.c */
1522 extern int ext4_sync_file(struct file *, struct dentry *, int);
1523
1524 /* hash.c */
1525 extern int ext4fs_dirhash(const char *name, int len, struct
1526 dx_hash_info *hinfo);
1527
1528 /* ialloc.c */
1529 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1530 const struct qstr *qstr, __u32 goal);
1531 extern void ext4_free_inode(handle_t *, struct inode *);
1532 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1533 extern unsigned long ext4_count_free_inodes(struct super_block *);
1534 extern unsigned long ext4_count_dirs(struct super_block *);
1535 extern void ext4_check_inodes_bitmap(struct super_block *);
1536 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1537 struct buffer_head *bh,
1538 ext4_group_t group,
1539 struct ext4_group_desc *desc);
1540 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1541
1542 /* mballoc.c */
1543 extern long ext4_mb_stats;
1544 extern long ext4_mb_max_to_scan;
1545 extern int ext4_mb_init(struct super_block *, int);
1546 extern int ext4_mb_release(struct super_block *);
1547 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1548 struct ext4_allocation_request *, int *);
1549 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1550 extern void ext4_discard_preallocations(struct inode *);
1551 extern int __init init_ext4_mballoc(void);
1552 extern void exit_ext4_mballoc(void);
1553 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1554 struct buffer_head *bh, ext4_fsblk_t block,
1555 unsigned long count, int flags);
1556 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1557 ext4_group_t i, struct ext4_group_desc *desc);
1558 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1559 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1560 ext4_group_t, int);
1561 /* inode.c */
1562 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1563 ext4_lblk_t, int, int *);
1564 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1565 ext4_lblk_t, int, int *);
1566 int ext4_get_block(struct inode *inode, sector_t iblock,
1567 struct buffer_head *bh_result, int create);
1568
1569 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1570 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1571 extern int ext4_setattr(struct dentry *, struct iattr *);
1572 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1573 struct kstat *stat);
1574 extern void ext4_delete_inode(struct inode *);
1575 extern int ext4_sync_inode(handle_t *, struct inode *);
1576 extern void ext4_dirty_inode(struct inode *);
1577 extern int ext4_change_inode_journal_flag(struct inode *, int);
1578 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1579 extern int ext4_can_truncate(struct inode *inode);
1580 extern void ext4_truncate(struct inode *);
1581 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1582 extern void ext4_set_inode_flags(struct inode *);
1583 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1584 extern int ext4_alloc_da_blocks(struct inode *inode);
1585 extern void ext4_set_aops(struct inode *inode);
1586 extern int ext4_writepage_trans_blocks(struct inode *);
1587 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1588 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1589 extern int ext4_block_truncate_page(handle_t *handle,
1590 struct address_space *mapping, loff_t from);
1591 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1592 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1593 extern int flush_completed_IO(struct inode *inode);
1594 extern void ext4_da_update_reserve_space(struct inode *inode,
1595 int used, int quota_claim);
1596 /* ioctl.c */
1597 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1598 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1599
1600 /* migrate.c */
1601 extern int ext4_ext_migrate(struct inode *);
1602
1603 /* namei.c */
1604 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1605 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1606 extern int ext4_orphan_add(handle_t *, struct inode *);
1607 extern int ext4_orphan_del(handle_t *, struct inode *);
1608 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1609 __u32 start_minor_hash, __u32 *next_hash);
1610
1611 /* resize.c */
1612 extern int ext4_group_add(struct super_block *sb,
1613 struct ext4_new_group_data *input);
1614 extern int ext4_group_extend(struct super_block *sb,
1615 struct ext4_super_block *es,
1616 ext4_fsblk_t n_blocks_count);
1617
1618 /* super.c */
1619 extern void __ext4_error(struct super_block *, const char *, const char *, ...)
1620 __attribute__ ((format (printf, 3, 4)));
1621 #define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message)
1622 extern void ext4_error_inode(const char *, struct inode *, const char *, ...)
1623 __attribute__ ((format (printf, 3, 4)));
1624 extern void ext4_error_file(const char *, struct file *, const char *, ...)
1625 __attribute__ ((format (printf, 3, 4)));
1626 extern void __ext4_std_error(struct super_block *, const char *, int);
1627 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1628 __attribute__ ((format (printf, 3, 4)));
1629 extern void __ext4_warning(struct super_block *, const char *,
1630 const char *, ...)
1631 __attribute__ ((format (printf, 3, 4)));
1632 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message)
1633 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1634 __attribute__ ((format (printf, 3, 4)));
1635 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1636 const char *, const char *, ...)
1637 __attribute__ ((format (printf, 4, 5)));
1638 extern void ext4_update_dynamic_rev(struct super_block *sb);
1639 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1640 __u32 compat);
1641 extern int ext4_update_rocompat_feature(handle_t *handle,
1642 struct super_block *sb, __u32 rocompat);
1643 extern int ext4_update_incompat_feature(handle_t *handle,
1644 struct super_block *sb, __u32 incompat);
1645 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1646 struct ext4_group_desc *bg);
1647 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1648 struct ext4_group_desc *bg);
1649 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1650 struct ext4_group_desc *bg);
1651 extern __u32 ext4_free_blks_count(struct super_block *sb,
1652 struct ext4_group_desc *bg);
1653 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1654 struct ext4_group_desc *bg);
1655 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1656 struct ext4_group_desc *bg);
1657 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1658 struct ext4_group_desc *bg);
1659 extern void ext4_block_bitmap_set(struct super_block *sb,
1660 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1661 extern void ext4_inode_bitmap_set(struct super_block *sb,
1662 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1663 extern void ext4_inode_table_set(struct super_block *sb,
1664 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1665 extern void ext4_free_blks_set(struct super_block *sb,
1666 struct ext4_group_desc *bg, __u32 count);
1667 extern void ext4_free_inodes_set(struct super_block *sb,
1668 struct ext4_group_desc *bg, __u32 count);
1669 extern void ext4_used_dirs_set(struct super_block *sb,
1670 struct ext4_group_desc *bg, __u32 count);
1671 extern void ext4_itable_unused_set(struct super_block *sb,
1672 struct ext4_group_desc *bg, __u32 count);
1673 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1674 struct ext4_group_desc *gdp);
1675 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1676 struct ext4_group_desc *gdp);
1677
1678 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1679 {
1680 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1681 le32_to_cpu(es->s_blocks_count_lo);
1682 }
1683
1684 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1685 {
1686 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1687 le32_to_cpu(es->s_r_blocks_count_lo);
1688 }
1689
1690 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1691 {
1692 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1693 le32_to_cpu(es->s_free_blocks_count_lo);
1694 }
1695
1696 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1697 ext4_fsblk_t blk)
1698 {
1699 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1700 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1701 }
1702
1703 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1704 ext4_fsblk_t blk)
1705 {
1706 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1707 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1708 }
1709
1710 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1711 ext4_fsblk_t blk)
1712 {
1713 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1714 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1715 }
1716
1717 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1718 {
1719 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1720 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1721 le32_to_cpu(raw_inode->i_size_lo);
1722 else
1723 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1724 }
1725
1726 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1727 {
1728 raw_inode->i_size_lo = cpu_to_le32(i_size);
1729 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1730 }
1731
1732 static inline
1733 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1734 ext4_group_t group)
1735 {
1736 struct ext4_group_info ***grp_info;
1737 long indexv, indexh;
1738 grp_info = EXT4_SB(sb)->s_group_info;
1739 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1740 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1741 return grp_info[indexv][indexh];
1742 }
1743
1744 /*
1745 * Reading s_groups_count requires using smp_rmb() afterwards. See
1746 * the locking protocol documented in the comments of ext4_group_add()
1747 * in resize.c
1748 */
1749 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1750 {
1751 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1752
1753 smp_rmb();
1754 return ngroups;
1755 }
1756
1757 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1758 ext4_group_t block_group)
1759 {
1760 return block_group >> sbi->s_log_groups_per_flex;
1761 }
1762
1763 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1764 {
1765 return 1 << sbi->s_log_groups_per_flex;
1766 }
1767
1768 #define ext4_std_error(sb, errno) \
1769 do { \
1770 if ((errno)) \
1771 __ext4_std_error((sb), __func__, (errno)); \
1772 } while (0)
1773
1774 #ifdef CONFIG_SMP
1775 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1776 * counters. So we need to make sure we have free blocks more
1777 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1778 */
1779 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1780 #else
1781 #define EXT4_FREEBLOCKS_WATERMARK 0
1782 #endif
1783
1784 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1785 {
1786 /*
1787 * XXX: replace with spinlock if seen contended -bzzz
1788 */
1789 down_write(&EXT4_I(inode)->i_data_sem);
1790 if (newsize > EXT4_I(inode)->i_disksize)
1791 EXT4_I(inode)->i_disksize = newsize;
1792 up_write(&EXT4_I(inode)->i_data_sem);
1793 return ;
1794 }
1795
1796 struct ext4_group_info {
1797 unsigned long bb_state;
1798 struct rb_root bb_free_root;
1799 ext4_grpblk_t bb_first_free; /* first free block */
1800 ext4_grpblk_t bb_free; /* total free blocks */
1801 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
1802 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
1803 struct list_head bb_prealloc_list;
1804 #ifdef DOUBLE_CHECK
1805 void *bb_bitmap;
1806 #endif
1807 struct rw_semaphore alloc_sem;
1808 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1809 * regions, index is order.
1810 * bb_counters[3] = 5 means
1811 * 5 free 8-block regions. */
1812 };
1813
1814 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1815
1816 #define EXT4_MB_GRP_NEED_INIT(grp) \
1817 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1818
1819 #define EXT4_MAX_CONTENTION 8
1820 #define EXT4_CONTENTION_THRESHOLD 2
1821
1822 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1823 ext4_group_t group)
1824 {
1825 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1826 }
1827
1828 /*
1829 * Returns true if the filesystem is busy enough that attempts to
1830 * access the block group locks has run into contention.
1831 */
1832 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1833 {
1834 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1835 }
1836
1837 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1838 {
1839 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1840 if (spin_trylock(lock))
1841 /*
1842 * We're able to grab the lock right away, so drop the
1843 * lock contention counter.
1844 */
1845 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1846 else {
1847 /*
1848 * The lock is busy, so bump the contention counter,
1849 * and then wait on the spin lock.
1850 */
1851 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1852 EXT4_MAX_CONTENTION);
1853 spin_lock(lock);
1854 }
1855 }
1856
1857 static inline void ext4_unlock_group(struct super_block *sb,
1858 ext4_group_t group)
1859 {
1860 spin_unlock(ext4_group_lock_ptr(sb, group));
1861 }
1862
1863 /*
1864 * Inodes and files operations
1865 */
1866
1867 /* dir.c */
1868 extern const struct file_operations ext4_dir_operations;
1869
1870 /* file.c */
1871 extern const struct inode_operations ext4_file_inode_operations;
1872 extern const struct file_operations ext4_file_operations;
1873
1874 /* namei.c */
1875 extern const struct inode_operations ext4_dir_inode_operations;
1876 extern const struct inode_operations ext4_special_inode_operations;
1877 extern struct dentry *ext4_get_parent(struct dentry *child);
1878
1879 /* symlink.c */
1880 extern const struct inode_operations ext4_symlink_inode_operations;
1881 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1882
1883 /* block_validity */
1884 extern void ext4_release_system_zone(struct super_block *sb);
1885 extern int ext4_setup_system_zone(struct super_block *sb);
1886 extern int __init init_ext4_system_zone(void);
1887 extern void exit_ext4_system_zone(void);
1888 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1889 ext4_fsblk_t start_blk,
1890 unsigned int count);
1891
1892 /* extents.c */
1893 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1894 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1895 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1896 int chunk);
1897 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
1898 struct ext4_map_blocks *map, int flags);
1899 extern void ext4_ext_truncate(struct inode *);
1900 extern void ext4_ext_init(struct super_block *);
1901 extern void ext4_ext_release(struct super_block *);
1902 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1903 loff_t len);
1904 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
1905 ssize_t len);
1906 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
1907 struct ext4_map_blocks *map, int flags);
1908 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1909 sector_t block, unsigned int max_blocks,
1910 struct buffer_head *bh, int flags);
1911 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1912 __u64 start, __u64 len);
1913 /* move_extent.c */
1914 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1915 __u64 start_orig, __u64 start_donor,
1916 __u64 len, __u64 *moved_len);
1917
1918
1919 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
1920 enum ext4_state_bits {
1921 BH_Uninit /* blocks are allocated but uninitialized on disk */
1922 = BH_JBDPrivateStart,
1923 };
1924
1925 BUFFER_FNS(Uninit, uninit)
1926 TAS_BUFFER_FNS(Uninit, uninit)
1927
1928 /*
1929 * Add new method to test wether block and inode bitmaps are properly
1930 * initialized. With uninit_bg reading the block from disk is not enough
1931 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1932 */
1933 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1934
1935 static inline int bitmap_uptodate(struct buffer_head *bh)
1936 {
1937 return (buffer_uptodate(bh) &&
1938 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1939 }
1940 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1941 {
1942 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1943 }
1944
1945 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
1946
1947 #endif /* __KERNEL__ */
1948
1949 #endif /* _EXT4_H */
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