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b43: Fix controller restart crash
[linux-2.6/verdex.git] / fs / ext4 / ext4.h
blob8158083f7ac0a04673529125fe2aa58babd4cb8d
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 "ext4_i.h"
23
24 /*
25 * The second extended filesystem constants/structures
26 */
27
28 /*
29 * Define EXT4FS_DEBUG to produce debug messages
30 */
31 #undef EXT4FS_DEBUG
32
33 /*
34 * Define EXT4_RESERVATION to reserve data blocks for expanding files
35 */
36 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
37 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
38 #define EXT4_MAX_RESERVE_BLOCKS 1027
39 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
40
41 /*
42 * Debug code
43 */
44 #ifdef EXT4FS_DEBUG
45 #define ext4_debug(f, a...) \
46 do { \
47 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
48 __FILE__, __LINE__, __FUNCTION__); \
49 printk (KERN_DEBUG f, ## a); \
50 } while (0)
51 #else
52 #define ext4_debug(f, a...) do {} while (0)
53 #endif
54
55 #define EXT4_MULTIBLOCK_ALLOCATOR 1
56
57 /* prefer goal again. length */
58 #define EXT4_MB_HINT_MERGE 1
59 /* blocks already reserved */
60 #define EXT4_MB_HINT_RESERVED 2
61 /* metadata is being allocated */
62 #define EXT4_MB_HINT_METADATA 4
63 /* first blocks in the file */
64 #define EXT4_MB_HINT_FIRST 8
65 /* search for the best chunk */
66 #define EXT4_MB_HINT_BEST 16
67 /* data is being allocated */
68 #define EXT4_MB_HINT_DATA 32
69 /* don't preallocate (for tails) */
70 #define EXT4_MB_HINT_NOPREALLOC 64
71 /* allocate for locality group */
72 #define EXT4_MB_HINT_GROUP_ALLOC 128
73 /* allocate goal blocks or none */
74 #define EXT4_MB_HINT_GOAL_ONLY 256
75 /* goal is meaningful */
76 #define EXT4_MB_HINT_TRY_GOAL 512
77
78 struct ext4_allocation_request {
79 /* target inode for block we're allocating */
80 struct inode *inode;
81 /* logical block in target inode */
82 ext4_lblk_t logical;
83 /* phys. target (a hint) */
84 ext4_fsblk_t goal;
85 /* the closest logical allocated block to the left */
86 ext4_lblk_t lleft;
87 /* phys. block for ^^^ */
88 ext4_fsblk_t pleft;
89 /* the closest logical allocated block to the right */
90 ext4_lblk_t lright;
91 /* phys. block for ^^^ */
92 ext4_fsblk_t pright;
93 /* how many blocks we want to allocate */
94 unsigned long len;
95 /* flags. see above EXT4_MB_HINT_* */
96 unsigned long flags;
97 };
98
99 /*
100 * Special inodes numbers
101 */
102 #define EXT4_BAD_INO 1 /* Bad blocks inode */
103 #define EXT4_ROOT_INO 2 /* Root inode */
104 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
105 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
106 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
107 #define EXT4_JOURNAL_INO 8 /* Journal inode */
108
109 /* First non-reserved inode for old ext4 filesystems */
110 #define EXT4_GOOD_OLD_FIRST_INO 11
111
112 /*
113 * Maximal count of links to a file
114 */
115 #define EXT4_LINK_MAX 65000
116
117 /*
118 * Macro-instructions used to manage several block sizes
119 */
120 #define EXT4_MIN_BLOCK_SIZE 1024
121 #define EXT4_MAX_BLOCK_SIZE 65536
122 #define EXT4_MIN_BLOCK_LOG_SIZE 10
123 #ifdef __KERNEL__
124 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
125 #else
126 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
127 #endif
128 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
129 #ifdef __KERNEL__
130 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
131 #else
132 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
133 #endif
134 #ifdef __KERNEL__
135 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
136 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
137 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
138 #else
139 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
140 EXT4_GOOD_OLD_INODE_SIZE : \
141 (s)->s_inode_size)
142 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
143 EXT4_GOOD_OLD_FIRST_INO : \
144 (s)->s_first_ino)
145 #endif
146 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
147
148 /*
149 * Structure of a blocks group descriptor
150 */
151 struct ext4_group_desc
152 {
153 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
154 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
155 __le32 bg_inode_table_lo; /* Inodes table block */
156 __le16 bg_free_blocks_count; /* Free blocks count */
157 __le16 bg_free_inodes_count; /* Free inodes count */
158 __le16 bg_used_dirs_count; /* Directories count */
159 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
160 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
161 __le16 bg_itable_unused; /* Unused inodes count */
162 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
163 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
164 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
165 __le32 bg_inode_table_hi; /* Inodes table block MSB */
166 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
167 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
168 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
169 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
170 __u32 bg_reserved2[3];
171 };
172
173 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
174 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
175 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
176
177 #ifdef __KERNEL__
178 #include "ext4_sb.h"
179 #endif
180 /*
181 * Macro-instructions used to manage group descriptors
182 */
183 #define EXT4_MIN_DESC_SIZE 32
184 #define EXT4_MIN_DESC_SIZE_64BIT 64
185 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
186 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
187 #ifdef __KERNEL__
188 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
189 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
190 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
191 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
192 #else
193 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
194 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
195 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
196 #endif
197
198 /*
199 * Constants relative to the data blocks
200 */
201 #define EXT4_NDIR_BLOCKS 12
202 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
203 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
204 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
205 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
206
207 /*
208 * Inode flags
209 */
210 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
211 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
212 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
213 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
214 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
215 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
216 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
217 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
218 /* Reserved for compression usage... */
219 #define EXT4_DIRTY_FL 0x00000100
220 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
221 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
222 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
223 /* End compression flags --- maybe not all used */
224 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
225 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
226 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
227 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
228 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
229 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
230 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
231 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
232 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
233 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
234
235 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
236 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
237
238 /*
239 * Inode dynamic state flags
240 */
241 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
242 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
243 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
244 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
245
246 /* Used to pass group descriptor data when online resize is done */
247 struct ext4_new_group_input {
248 __u32 group; /* Group number for this data */
249 __u64 block_bitmap; /* Absolute block number of block bitmap */
250 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
251 __u64 inode_table; /* Absolute block number of inode table start */
252 __u32 blocks_count; /* Total number of blocks in this group */
253 __u16 reserved_blocks; /* Number of reserved blocks in this group */
254 __u16 unused;
255 };
256
257 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
258 struct ext4_new_group_data {
259 __u32 group;
260 __u64 block_bitmap;
261 __u64 inode_bitmap;
262 __u64 inode_table;
263 __u32 blocks_count;
264 __u16 reserved_blocks;
265 __u16 unused;
266 __u32 free_blocks_count;
267 };
268
269 /*
270 * Following is used by preallocation code to tell get_blocks() that we
271 * want uninitialzed extents.
272 */
273 #define EXT4_CREATE_UNINITIALIZED_EXT 2
274
275 /*
276 * ioctl commands
277 */
278 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
279 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
280 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
281 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
282 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
283 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
284 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
285 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
286 #ifdef CONFIG_JBD2_DEBUG
287 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
288 #endif
289 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
290 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
291 #define EXT4_IOC_MIGRATE _IO('f', 7)
292
293 /*
294 * ioctl commands in 32 bit emulation
295 */
296 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
297 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
298 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
299 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
300 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
301 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
302 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
303 #ifdef CONFIG_JBD2_DEBUG
304 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
305 #endif
306 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
307 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
308
309
310 /*
311 * Mount options
312 */
313 struct ext4_mount_options {
314 unsigned long s_mount_opt;
315 uid_t s_resuid;
316 gid_t s_resgid;
317 unsigned long s_commit_interval;
318 #ifdef CONFIG_QUOTA
319 int s_jquota_fmt;
320 char *s_qf_names[MAXQUOTAS];
321 #endif
322 };
323
324 /*
325 * Structure of an inode on the disk
326 */
327 struct ext4_inode {
328 __le16 i_mode; /* File mode */
329 __le16 i_uid; /* Low 16 bits of Owner Uid */
330 __le32 i_size_lo; /* Size in bytes */
331 __le32 i_atime; /* Access time */
332 __le32 i_ctime; /* Inode Change time */
333 __le32 i_mtime; /* Modification time */
334 __le32 i_dtime; /* Deletion Time */
335 __le16 i_gid; /* Low 16 bits of Group Id */
336 __le16 i_links_count; /* Links count */
337 __le32 i_blocks_lo; /* Blocks count */
338 __le32 i_flags; /* File flags */
339 union {
340 struct {
341 __le32 l_i_version;
342 } linux1;
343 struct {
344 __u32 h_i_translator;
345 } hurd1;
346 struct {
347 __u32 m_i_reserved1;
348 } masix1;
349 } osd1; /* OS dependent 1 */
350 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
351 __le32 i_generation; /* File version (for NFS) */
352 __le32 i_file_acl_lo; /* File ACL */
353 __le32 i_size_high;
354 __le32 i_obso_faddr; /* Obsoleted fragment address */
355 union {
356 struct {
357 __le16 l_i_blocks_high; /* were l_i_reserved1 */
358 __le16 l_i_file_acl_high;
359 __le16 l_i_uid_high; /* these 2 fields */
360 __le16 l_i_gid_high; /* were reserved2[0] */
361 __u32 l_i_reserved2;
362 } linux2;
363 struct {
364 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
365 __u16 h_i_mode_high;
366 __u16 h_i_uid_high;
367 __u16 h_i_gid_high;
368 __u32 h_i_author;
369 } hurd2;
370 struct {
371 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
372 __le16 m_i_file_acl_high;
373 __u32 m_i_reserved2[2];
374 } masix2;
375 } osd2; /* OS dependent 2 */
376 __le16 i_extra_isize;
377 __le16 i_pad1;
378 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
379 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
380 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
381 __le32 i_crtime; /* File Creation time */
382 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
383 __le32 i_version_hi; /* high 32 bits for 64-bit version */
384 };
385
386
387 #define EXT4_EPOCH_BITS 2
388 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
389 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
390
391 /*
392 * Extended fields will fit into an inode if the filesystem was formatted
393 * with large inodes (-I 256 or larger) and there are not currently any EAs
394 * consuming all of the available space. For new inodes we always reserve
395 * enough space for the kernel's known extended fields, but for inodes
396 * created with an old kernel this might not have been the case. None of
397 * the extended inode fields is critical for correct filesystem operation.
398 * This macro checks if a certain field fits in the inode. Note that
399 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
400 */
401 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
402 ((offsetof(typeof(*ext4_inode), field) + \
403 sizeof((ext4_inode)->field)) \
404 <= (EXT4_GOOD_OLD_INODE_SIZE + \
405 (einode)->i_extra_isize)) \
406
407 static inline __le32 ext4_encode_extra_time(struct timespec *time)
408 {
409 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
410 time->tv_sec >> 32 : 0) |
411 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
412 }
413
414 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
415 {
416 if (sizeof(time->tv_sec) > 4)
417 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
418 << 32;
419 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
420 }
421
422 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
423 do { \
424 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
425 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
426 (raw_inode)->xtime ## _extra = \
427 ext4_encode_extra_time(&(inode)->xtime); \
428 } while (0)
429
430 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
431 do { \
432 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
433 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
434 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
435 (raw_inode)->xtime ## _extra = \
436 ext4_encode_extra_time(&(einode)->xtime); \
437 } while (0)
438
439 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
440 do { \
441 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
442 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
443 ext4_decode_extra_time(&(inode)->xtime, \
444 raw_inode->xtime ## _extra); \
445 } while (0)
446
447 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
448 do { \
449 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
450 (einode)->xtime.tv_sec = \
451 (signed)le32_to_cpu((raw_inode)->xtime); \
452 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
453 ext4_decode_extra_time(&(einode)->xtime, \
454 raw_inode->xtime ## _extra); \
455 } while (0)
456
457 #define i_disk_version osd1.linux1.l_i_version
458
459 #if defined(__KERNEL__) || defined(__linux__)
460 #define i_reserved1 osd1.linux1.l_i_reserved1
461 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
462 #define i_blocks_high osd2.linux2.l_i_blocks_high
463 #define i_uid_low i_uid
464 #define i_gid_low i_gid
465 #define i_uid_high osd2.linux2.l_i_uid_high
466 #define i_gid_high osd2.linux2.l_i_gid_high
467 #define i_reserved2 osd2.linux2.l_i_reserved2
468
469 #elif defined(__GNU__)
470
471 #define i_translator osd1.hurd1.h_i_translator
472 #define i_uid_high osd2.hurd2.h_i_uid_high
473 #define i_gid_high osd2.hurd2.h_i_gid_high
474 #define i_author osd2.hurd2.h_i_author
475
476 #elif defined(__masix__)
477
478 #define i_reserved1 osd1.masix1.m_i_reserved1
479 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
480 #define i_reserved2 osd2.masix2.m_i_reserved2
481
482 #endif /* defined(__KERNEL__) || defined(__linux__) */
483
484 /*
485 * File system states
486 */
487 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
488 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
489 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
490
491 /*
492 * Misc. filesystem flags
493 */
494 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
495 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
496 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
497
498 /*
499 * Mount flags
500 */
501 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
502 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
503 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
504 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
505 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
506 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
507 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
508 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
509 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
510 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
511 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
512 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
513 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
514 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
515 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
516 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
517 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
518 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
519 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
520 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
521 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
522 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
523 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
524 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
525 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
526 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
527 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
528 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
529 #define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
530 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
531 #ifndef _LINUX_EXT2_FS_H
532 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
533 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
534 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
535 EXT4_MOUNT_##opt)
536 #else
537 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
538 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
539 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
540 #endif
541
542 #define ext4_set_bit ext2_set_bit
543 #define ext4_set_bit_atomic ext2_set_bit_atomic
544 #define ext4_clear_bit ext2_clear_bit
545 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
546 #define ext4_test_bit ext2_test_bit
547 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
548 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
549 #define ext4_find_next_bit ext2_find_next_bit
550
551 /*
552 * Maximal mount counts between two filesystem checks
553 */
554 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
555 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
556
557 /*
558 * Behaviour when detecting errors
559 */
560 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
561 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
562 #define EXT4_ERRORS_PANIC 3 /* Panic */
563 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
564
565 /*
566 * Structure of the super block
567 */
568 struct ext4_super_block {
569 /*00*/ __le32 s_inodes_count; /* Inodes count */
570 __le32 s_blocks_count_lo; /* Blocks count */
571 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
572 __le32 s_free_blocks_count_lo; /* Free blocks count */
573 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
574 __le32 s_first_data_block; /* First Data Block */
575 __le32 s_log_block_size; /* Block size */
576 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
577 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
578 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
579 __le32 s_inodes_per_group; /* # Inodes per group */
580 __le32 s_mtime; /* Mount time */
581 /*30*/ __le32 s_wtime; /* Write time */
582 __le16 s_mnt_count; /* Mount count */
583 __le16 s_max_mnt_count; /* Maximal mount count */
584 __le16 s_magic; /* Magic signature */
585 __le16 s_state; /* File system state */
586 __le16 s_errors; /* Behaviour when detecting errors */
587 __le16 s_minor_rev_level; /* minor revision level */
588 /*40*/ __le32 s_lastcheck; /* time of last check */
589 __le32 s_checkinterval; /* max. time between checks */
590 __le32 s_creator_os; /* OS */
591 __le32 s_rev_level; /* Revision level */
592 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
593 __le16 s_def_resgid; /* Default gid for reserved blocks */
594 /*
595 * These fields are for EXT4_DYNAMIC_REV superblocks only.
596 *
597 * Note: the difference between the compatible feature set and
598 * the incompatible feature set is that if there is a bit set
599 * in the incompatible feature set that the kernel doesn't
600 * know about, it should refuse to mount the filesystem.
601 *
602 * e2fsck's requirements are more strict; if it doesn't know
603 * about a feature in either the compatible or incompatible
604 * feature set, it must abort and not try to meddle with
605 * things it doesn't understand...
606 */
607 __le32 s_first_ino; /* First non-reserved inode */
608 __le16 s_inode_size; /* size of inode structure */
609 __le16 s_block_group_nr; /* block group # of this superblock */
610 __le32 s_feature_compat; /* compatible feature set */
611 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
612 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
613 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
614 /*78*/ char s_volume_name[16]; /* volume name */
615 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
616 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
617 /*
618 * Performance hints. Directory preallocation should only
619 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
620 */
621 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
622 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
623 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
624 /*
625 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
626 */
627 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
628 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
629 __le32 s_journal_dev; /* device number of journal file */
630 __le32 s_last_orphan; /* start of list of inodes to delete */
631 __le32 s_hash_seed[4]; /* HTREE hash seed */
632 __u8 s_def_hash_version; /* Default hash version to use */
633 __u8 s_reserved_char_pad;
634 __le16 s_desc_size; /* size of group descriptor */
635 /*100*/ __le32 s_default_mount_opts;
636 __le32 s_first_meta_bg; /* First metablock block group */
637 __le32 s_mkfs_time; /* When the filesystem was created */
638 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
639 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
640 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
641 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
642 __le32 s_free_blocks_count_hi; /* Free blocks count */
643 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
644 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
645 __le32 s_flags; /* Miscellaneous flags */
646 __le16 s_raid_stride; /* RAID stride */
647 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
648 __le64 s_mmp_block; /* Block for multi-mount protection */
649 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
650 __u32 s_reserved[163]; /* Padding to the end of the block */
651 };
652
653 #ifdef __KERNEL__
654 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
655 {
656 return sb->s_fs_info;
657 }
658 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
659 {
660 return container_of(inode, struct ext4_inode_info, vfs_inode);
661 }
662
663 static inline struct timespec ext4_current_time(struct inode *inode)
664 {
665 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
666 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
667 }
668
669
670 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
671 {
672 return ino == EXT4_ROOT_INO ||
673 ino == EXT4_JOURNAL_INO ||
674 ino == EXT4_RESIZE_INO ||
675 (ino >= EXT4_FIRST_INO(sb) &&
676 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
677 }
678 #else
679 /* Assume that user mode programs are passing in an ext4fs superblock, not
680 * a kernel struct super_block. This will allow us to call the feature-test
681 * macros from user land. */
682 #define EXT4_SB(sb) (sb)
683 #endif
684
685 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
686
687 /*
688 * Codes for operating systems
689 */
690 #define EXT4_OS_LINUX 0
691 #define EXT4_OS_HURD 1
692 #define EXT4_OS_MASIX 2
693 #define EXT4_OS_FREEBSD 3
694 #define EXT4_OS_LITES 4
695
696 /*
697 * Revision levels
698 */
699 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
700 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
701
702 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
703 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
704
705 #define EXT4_GOOD_OLD_INODE_SIZE 128
706
707 /*
708 * Feature set definitions
709 */
710
711 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
712 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
713 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
714 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
715 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
716 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
717 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
718 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
719 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
720 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
721 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
722 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
723 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
724 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
725 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
726 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
727 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
728 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
729
730 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
731 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
732 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
733 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
734 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
735 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
736
737 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
738 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
739 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
740 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
741 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
742 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
743 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
744
745 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
746 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
747 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
748 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
749 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
750 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
751 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
752 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
753 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
754
755 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
756 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
757 EXT4_FEATURE_INCOMPAT_RECOVER| \
758 EXT4_FEATURE_INCOMPAT_META_BG| \
759 EXT4_FEATURE_INCOMPAT_EXTENTS| \
760 EXT4_FEATURE_INCOMPAT_64BIT| \
761 EXT4_FEATURE_INCOMPAT_FLEX_BG)
762 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
763 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
764 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
765 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
766 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
767 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
768 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
769
770 /*
771 * Default values for user and/or group using reserved blocks
772 */
773 #define EXT4_DEF_RESUID 0
774 #define EXT4_DEF_RESGID 0
775
776 /*
777 * Default mount options
778 */
779 #define EXT4_DEFM_DEBUG 0x0001
780 #define EXT4_DEFM_BSDGROUPS 0x0002
781 #define EXT4_DEFM_XATTR_USER 0x0004
782 #define EXT4_DEFM_ACL 0x0008
783 #define EXT4_DEFM_UID16 0x0010
784 #define EXT4_DEFM_JMODE 0x0060
785 #define EXT4_DEFM_JMODE_DATA 0x0020
786 #define EXT4_DEFM_JMODE_ORDERED 0x0040
787 #define EXT4_DEFM_JMODE_WBACK 0x0060
788
789 /*
790 * Structure of a directory entry
791 */
792 #define EXT4_NAME_LEN 255
793
794 struct ext4_dir_entry {
795 __le32 inode; /* Inode number */
796 __le16 rec_len; /* Directory entry length */
797 __le16 name_len; /* Name length */
798 char name[EXT4_NAME_LEN]; /* File name */
799 };
800
801 /*
802 * The new version of the directory entry. Since EXT4 structures are
803 * stored in intel byte order, and the name_len field could never be
804 * bigger than 255 chars, it's safe to reclaim the extra byte for the
805 * file_type field.
806 */
807 struct ext4_dir_entry_2 {
808 __le32 inode; /* Inode number */
809 __le16 rec_len; /* Directory entry length */
810 __u8 name_len; /* Name length */
811 __u8 file_type;
812 char name[EXT4_NAME_LEN]; /* File name */
813 };
814
815 /*
816 * Ext4 directory file types. Only the low 3 bits are used. The
817 * other bits are reserved for now.
818 */
819 #define EXT4_FT_UNKNOWN 0
820 #define EXT4_FT_REG_FILE 1
821 #define EXT4_FT_DIR 2
822 #define EXT4_FT_CHRDEV 3
823 #define EXT4_FT_BLKDEV 4
824 #define EXT4_FT_FIFO 5
825 #define EXT4_FT_SOCK 6
826 #define EXT4_FT_SYMLINK 7
827
828 #define EXT4_FT_MAX 8
829
830 /*
831 * EXT4_DIR_PAD defines the directory entries boundaries
832 *
833 * NOTE: It must be a multiple of 4
834 */
835 #define EXT4_DIR_PAD 4
836 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
837 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
838 ~EXT4_DIR_ROUND)
839 #define EXT4_MAX_REC_LEN ((1<<16)-1)
840
841 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
842 {
843 unsigned len = le16_to_cpu(dlen);
844
845 if (len == EXT4_MAX_REC_LEN)
846 return 1 << 16;
847 return len;
848 }
849
850 static inline __le16 ext4_rec_len_to_disk(unsigned len)
851 {
852 if (len == (1 << 16))
853 return cpu_to_le16(EXT4_MAX_REC_LEN);
854 else if (len > (1 << 16))
855 BUG();
856 return cpu_to_le16(len);
857 }
858
859 /*
860 * Hash Tree Directory indexing
861 * (c) Daniel Phillips, 2001
862 */
863
864 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
865 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
866 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
867 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
868 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
869
870 /* Legal values for the dx_root hash_version field: */
871
872 #define DX_HASH_LEGACY 0
873 #define DX_HASH_HALF_MD4 1
874 #define DX_HASH_TEA 2
875
876 #ifdef __KERNEL__
877
878 /* hash info structure used by the directory hash */
879 struct dx_hash_info
880 {
881 u32 hash;
882 u32 minor_hash;
883 int hash_version;
884 u32 *seed;
885 };
886
887 #define EXT4_HTREE_EOF 0x7fffffff
888
889 /*
890 * Control parameters used by ext4_htree_next_block
891 */
892 #define HASH_NB_ALWAYS 1
893
894
895 /*
896 * Describe an inode's exact location on disk and in memory
897 */
898 struct ext4_iloc
899 {
900 struct buffer_head *bh;
901 unsigned long offset;
902 ext4_group_t block_group;
903 };
904
905 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
906 {
907 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
908 }
909
910 /*
911 * This structure is stuffed into the struct file's private_data field
912 * for directories. It is where we put information so that we can do
913 * readdir operations in hash tree order.
914 */
915 struct dir_private_info {
916 struct rb_root root;
917 struct rb_node *curr_node;
918 struct fname *extra_fname;
919 loff_t last_pos;
920 __u32 curr_hash;
921 __u32 curr_minor_hash;
922 __u32 next_hash;
923 };
924
925 /* calculate the first block number of the group */
926 static inline ext4_fsblk_t
927 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
928 {
929 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
930 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
931 }
932
933 /*
934 * Special error return code only used by dx_probe() and its callers.
935 */
936 #define ERR_BAD_DX_DIR -75000
937
938 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
939 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
940
941 /*
942 * Function prototypes
943 */
944
945 /*
946 * Ok, these declarations are also in <linux/kernel.h> but none of the
947 * ext4 source programs needs to include it so they are duplicated here.
948 */
949 # define NORET_TYPE /**/
950 # define ATTRIB_NORET __attribute__((noreturn))
951 # define NORET_AND noreturn,
952
953 /* balloc.c */
954 extern unsigned int ext4_block_group(struct super_block *sb,
955 ext4_fsblk_t blocknr);
956 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
957 ext4_fsblk_t blocknr);
958 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
959 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
960 ext4_group_t group);
961 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
962 ext4_fsblk_t goal, int *errp);
963 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
964 ext4_fsblk_t goal, unsigned long *count, int *errp);
965 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
966 ext4_fsblk_t goal, unsigned long *count, int *errp);
967 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
968 ext4_fsblk_t block, unsigned long count, int metadata);
969 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
970 ext4_fsblk_t block, unsigned long count,
971 unsigned long *pdquot_freed_blocks);
972 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
973 extern void ext4_check_blocks_bitmap (struct super_block *);
974 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
975 ext4_group_t block_group,
976 struct buffer_head ** bh);
977 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
978 extern void ext4_init_block_alloc_info(struct inode *);
979 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
980
981 /* dir.c */
982 extern int ext4_check_dir_entry(const char *, struct inode *,
983 struct ext4_dir_entry_2 *,
984 struct buffer_head *, unsigned long);
985 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
986 __u32 minor_hash,
987 struct ext4_dir_entry_2 *dirent);
988 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
989
990 /* fsync.c */
991 extern int ext4_sync_file (struct file *, struct dentry *, int);
992
993 /* hash.c */
994 extern int ext4fs_dirhash(const char *name, int len, struct
995 dx_hash_info *hinfo);
996
997 /* ialloc.c */
998 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
999 extern void ext4_free_inode (handle_t *, struct inode *);
1000 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
1001 extern unsigned long ext4_count_free_inodes (struct super_block *);
1002 extern unsigned long ext4_count_dirs (struct super_block *);
1003 extern void ext4_check_inodes_bitmap (struct super_block *);
1004 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
1005
1006 /* mballoc.c */
1007 extern long ext4_mb_stats;
1008 extern long ext4_mb_max_to_scan;
1009 extern int ext4_mb_init(struct super_block *, int);
1010 extern int ext4_mb_release(struct super_block *);
1011 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1012 struct ext4_allocation_request *, int *);
1013 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1014 extern void ext4_mb_discard_inode_preallocations(struct inode *);
1015 extern int __init init_ext4_mballoc(void);
1016 extern void exit_ext4_mballoc(void);
1017 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1018 unsigned long, unsigned long, int, unsigned long *);
1019
1020
1021 /* inode.c */
1022 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1023 struct buffer_head *bh, ext4_fsblk_t blocknr);
1024 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1025 ext4_lblk_t, int, int *);
1026 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1027 ext4_lblk_t, int, int *);
1028 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1029 ext4_lblk_t iblock, unsigned long maxblocks,
1030 struct buffer_head *bh_result,
1031 int create, int extend_disksize);
1032
1033 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1034 extern int ext4_write_inode (struct inode *, int);
1035 extern int ext4_setattr (struct dentry *, struct iattr *);
1036 extern void ext4_delete_inode (struct inode *);
1037 extern int ext4_sync_inode (handle_t *, struct inode *);
1038 extern void ext4_discard_reservation (struct inode *);
1039 extern void ext4_dirty_inode(struct inode *);
1040 extern int ext4_change_inode_journal_flag(struct inode *, int);
1041 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1042 extern void ext4_truncate (struct inode *);
1043 extern void ext4_set_inode_flags(struct inode *);
1044 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1045 extern void ext4_set_aops(struct inode *inode);
1046 extern int ext4_writepage_trans_blocks(struct inode *);
1047 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1048 struct address_space *mapping, loff_t from);
1049
1050 /* ioctl.c */
1051 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1052 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1053
1054 /* migrate.c */
1055 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1056 unsigned long);
1057 /* namei.c */
1058 extern int ext4_orphan_add(handle_t *, struct inode *);
1059 extern int ext4_orphan_del(handle_t *, struct inode *);
1060 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1061 __u32 start_minor_hash, __u32 *next_hash);
1062
1063 /* resize.c */
1064 extern int ext4_group_add(struct super_block *sb,
1065 struct ext4_new_group_data *input);
1066 extern int ext4_group_extend(struct super_block *sb,
1067 struct ext4_super_block *es,
1068 ext4_fsblk_t n_blocks_count);
1069
1070 /* super.c */
1071 extern void ext4_error (struct super_block *, const char *, const char *, ...)
1072 __attribute__ ((format (printf, 3, 4)));
1073 extern void __ext4_std_error (struct super_block *, const char *, int);
1074 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1075 __attribute__ ((format (printf, 3, 4)));
1076 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1077 __attribute__ ((format (printf, 3, 4)));
1078 extern void ext4_update_dynamic_rev (struct super_block *sb);
1079 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1080 __u32 compat);
1081 extern int ext4_update_rocompat_feature(handle_t *handle,
1082 struct super_block *sb, __u32 rocompat);
1083 extern int ext4_update_incompat_feature(handle_t *handle,
1084 struct super_block *sb, __u32 incompat);
1085 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1086 struct ext4_group_desc *bg);
1087 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1088 struct ext4_group_desc *bg);
1089 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1090 struct ext4_group_desc *bg);
1091 extern void ext4_block_bitmap_set(struct super_block *sb,
1092 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1093 extern void ext4_inode_bitmap_set(struct super_block *sb,
1094 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1095 extern void ext4_inode_table_set(struct super_block *sb,
1096 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1097
1098 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1099 {
1100 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1101 le32_to_cpu(es->s_blocks_count_lo);
1102 }
1103
1104 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1105 {
1106 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1107 le32_to_cpu(es->s_r_blocks_count_lo);
1108 }
1109
1110 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1111 {
1112 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1113 le32_to_cpu(es->s_free_blocks_count_lo);
1114 }
1115
1116 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1117 ext4_fsblk_t blk)
1118 {
1119 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1120 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1121 }
1122
1123 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1124 ext4_fsblk_t blk)
1125 {
1126 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1127 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1128 }
1129
1130 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1131 ext4_fsblk_t blk)
1132 {
1133 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1134 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1135 }
1136
1137 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1138 {
1139 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1140 le32_to_cpu(raw_inode->i_size_lo);
1141 }
1142
1143 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1144 {
1145 raw_inode->i_size_lo = cpu_to_le32(i_size);
1146 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1147 }
1148
1149 static inline
1150 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1151 ext4_group_t group)
1152 {
1153 struct ext4_group_info ***grp_info;
1154 long indexv, indexh;
1155 grp_info = EXT4_SB(sb)->s_group_info;
1156 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1157 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1158 return grp_info[indexv][indexh];
1159 }
1160
1161
1162 #define ext4_std_error(sb, errno) \
1163 do { \
1164 if ((errno)) \
1165 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1166 } while (0)
1167
1168 /*
1169 * Inodes and files operations
1170 */
1171
1172 /* dir.c */
1173 extern const struct file_operations ext4_dir_operations;
1174
1175 /* file.c */
1176 extern const struct inode_operations ext4_file_inode_operations;
1177 extern const struct file_operations ext4_file_operations;
1178
1179 /* namei.c */
1180 extern const struct inode_operations ext4_dir_inode_operations;
1181 extern const struct inode_operations ext4_special_inode_operations;
1182
1183 /* symlink.c */
1184 extern const struct inode_operations ext4_symlink_inode_operations;
1185 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1186
1187 /* extents.c */
1188 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1189 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1190 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1191 ext4_lblk_t iblock,
1192 unsigned long max_blocks, struct buffer_head *bh_result,
1193 int create, int extend_disksize);
1194 extern void ext4_ext_truncate(struct inode *, struct page *);
1195 extern void ext4_ext_init(struct super_block *);
1196 extern void ext4_ext_release(struct super_block *);
1197 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1198 loff_t len);
1199 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1200 sector_t block, unsigned long max_blocks,
1201 struct buffer_head *bh, int create,
1202 int extend_disksize);
1203 #endif /* __KERNEL__ */
1204
1205 #endif /* _EXT4_H */
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