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debug: turn ignore_loglevel into an early param
[wrt350n-kernel.git] / include / linux / ext4_fs.h
blob1852313fc7c73605887a1447ae33d18645c298c1
1 /*
2 * linux/include/linux/ext4_fs.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 _LINUX_EXT4_FS_H
17 #define _LINUX_EXT4_FS_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22
23 #include <linux/ext4_fs_i.h>
24
25 /*
26 * The second extended filesystem constants/structures
27 */
28
29 /*
30 * Define EXT4FS_DEBUG to produce debug messages
31 */
32 #undef EXT4FS_DEBUG
33
34 /*
35 * Define EXT4_RESERVATION to reserve data blocks for expanding files
36 */
37 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
38 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
39 #define EXT4_MAX_RESERVE_BLOCKS 1027
40 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
41
42 /*
43 * Debug code
44 */
45 #ifdef EXT4FS_DEBUG
46 #define ext4_debug(f, a...) \
47 do { \
48 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __FUNCTION__); \
50 printk (KERN_DEBUG f, ## a); \
51 } while (0)
52 #else
53 #define ext4_debug(f, a...) do {} while (0)
54 #endif
55
56 #define EXT4_MULTIBLOCK_ALLOCATOR 1
57
58 /* prefer goal again. length */
59 #define EXT4_MB_HINT_MERGE 1
60 /* blocks already reserved */
61 #define EXT4_MB_HINT_RESERVED 2
62 /* metadata is being allocated */
63 #define EXT4_MB_HINT_METADATA 4
64 /* first blocks in the file */
65 #define EXT4_MB_HINT_FIRST 8
66 /* search for the best chunk */
67 #define EXT4_MB_HINT_BEST 16
68 /* data is being allocated */
69 #define EXT4_MB_HINT_DATA 32
70 /* don't preallocate (for tails) */
71 #define EXT4_MB_HINT_NOPREALLOC 64
72 /* allocate for locality group */
73 #define EXT4_MB_HINT_GROUP_ALLOC 128
74 /* allocate goal blocks or none */
75 #define EXT4_MB_HINT_GOAL_ONLY 256
76 /* goal is meaningful */
77 #define EXT4_MB_HINT_TRY_GOAL 512
78
79 struct ext4_allocation_request {
80 /* target inode for block we're allocating */
81 struct inode *inode;
82 /* logical block in target inode */
83 ext4_lblk_t logical;
84 /* phys. target (a hint) */
85 ext4_fsblk_t goal;
86 /* the closest logical allocated block to the left */
87 ext4_lblk_t lleft;
88 /* phys. block for ^^^ */
89 ext4_fsblk_t pleft;
90 /* the closest logical allocated block to the right */
91 ext4_lblk_t lright;
92 /* phys. block for ^^^ */
93 ext4_fsblk_t pright;
94 /* how many blocks we want to allocate */
95 unsigned long len;
96 /* flags. see above EXT4_MB_HINT_* */
97 unsigned long flags;
98 };
99
100 /*
101 * Special inodes numbers
102 */
103 #define EXT4_BAD_INO 1 /* Bad blocks inode */
104 #define EXT4_ROOT_INO 2 /* Root inode */
105 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
106 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
107 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
108 #define EXT4_JOURNAL_INO 8 /* Journal inode */
109
110 /* First non-reserved inode for old ext4 filesystems */
111 #define EXT4_GOOD_OLD_FIRST_INO 11
112
113 /*
114 * Maximal count of links to a file
115 */
116 #define EXT4_LINK_MAX 65000
117
118 /*
119 * Macro-instructions used to manage several block sizes
120 */
121 #define EXT4_MIN_BLOCK_SIZE 1024
122 #define EXT4_MAX_BLOCK_SIZE 65536
123 #define EXT4_MIN_BLOCK_LOG_SIZE 10
124 #ifdef __KERNEL__
125 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
126 #else
127 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
128 #endif
129 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
130 #ifdef __KERNEL__
131 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
132 #else
133 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
134 #endif
135 #ifdef __KERNEL__
136 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
137 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
138 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
139 #else
140 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
141 EXT4_GOOD_OLD_INODE_SIZE : \
142 (s)->s_inode_size)
143 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
144 EXT4_GOOD_OLD_FIRST_INO : \
145 (s)->s_first_ino)
146 #endif
147 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
148
149 /*
150 * Structure of a blocks group descriptor
151 */
152 struct ext4_group_desc
153 {
154 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
155 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
156 __le32 bg_inode_table_lo; /* Inodes table block */
157 __le16 bg_free_blocks_count; /* Free blocks count */
158 __le16 bg_free_inodes_count; /* Free inodes count */
159 __le16 bg_used_dirs_count; /* Directories count */
160 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
161 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
162 __le16 bg_itable_unused; /* Unused inodes count */
163 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
164 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
165 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
166 __le32 bg_inode_table_hi; /* Inodes table block MSB */
167 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
168 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
169 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
170 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
171 __u32 bg_reserved2[3];
172 };
173
174 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
175 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
176 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
177
178 #ifdef __KERNEL__
179 #include <linux/ext4_fs_i.h>
180 #include <linux/ext4_fs_sb.h>
181 #endif
182 /*
183 * Macro-instructions used to manage group descriptors
184 */
185 #define EXT4_MIN_DESC_SIZE 32
186 #define EXT4_MIN_DESC_SIZE_64BIT 64
187 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
188 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
189 #ifdef __KERNEL__
190 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
191 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
192 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
193 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
194 #else
195 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
196 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
197 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
198 #endif
199
200 /*
201 * Constants relative to the data blocks
202 */
203 #define EXT4_NDIR_BLOCKS 12
204 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
205 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
206 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
207 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
208
209 /*
210 * Inode flags
211 */
212 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
213 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
214 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
215 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
216 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
217 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
218 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
219 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
220 /* Reserved for compression usage... */
221 #define EXT4_DIRTY_FL 0x00000100
222 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
223 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
224 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
225 /* End compression flags --- maybe not all used */
226 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
227 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
228 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
229 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
230 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
231 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
232 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
233 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
234 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
235
236 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
237 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
238
239 /*
240 * Inode dynamic state flags
241 */
242 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
243 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
244 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
245 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
246
247 /* Used to pass group descriptor data when online resize is done */
248 struct ext4_new_group_input {
249 __u32 group; /* Group number for this data */
250 __u64 block_bitmap; /* Absolute block number of block bitmap */
251 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
252 __u64 inode_table; /* Absolute block number of inode table start */
253 __u32 blocks_count; /* Total number of blocks in this group */
254 __u16 reserved_blocks; /* Number of reserved blocks in this group */
255 __u16 unused;
256 };
257
258 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
259 struct ext4_new_group_data {
260 __u32 group;
261 __u64 block_bitmap;
262 __u64 inode_bitmap;
263 __u64 inode_table;
264 __u32 blocks_count;
265 __u16 reserved_blocks;
266 __u16 unused;
267 __u32 free_blocks_count;
268 };
269
270 /*
271 * Following is used by preallocation code to tell get_blocks() that we
272 * want uninitialzed extents.
273 */
274 #define EXT4_CREATE_UNINITIALIZED_EXT 2
275
276 /*
277 * ioctl commands
278 */
279 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
280 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
281 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
282 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
283 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
284 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
285 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
286 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
287 #ifdef CONFIG_JBD2_DEBUG
288 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
289 #endif
290 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
291 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
292 #define EXT4_IOC_MIGRATE _IO('f', 7)
293
294 /*
295 * ioctl commands in 32 bit emulation
296 */
297 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
298 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
299 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
300 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
301 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
302 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
303 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
304 #ifdef CONFIG_JBD2_DEBUG
305 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
306 #endif
307 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
308 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
309
310
311 /*
312 * Mount options
313 */
314 struct ext4_mount_options {
315 unsigned long s_mount_opt;
316 uid_t s_resuid;
317 gid_t s_resgid;
318 unsigned long s_commit_interval;
319 #ifdef CONFIG_QUOTA
320 int s_jquota_fmt;
321 char *s_qf_names[MAXQUOTAS];
322 #endif
323 };
324
325 /*
326 * Structure of an inode on the disk
327 */
328 struct ext4_inode {
329 __le16 i_mode; /* File mode */
330 __le16 i_uid; /* Low 16 bits of Owner Uid */
331 __le32 i_size_lo; /* Size in bytes */
332 __le32 i_atime; /* Access time */
333 __le32 i_ctime; /* Inode Change time */
334 __le32 i_mtime; /* Modification time */
335 __le32 i_dtime; /* Deletion Time */
336 __le16 i_gid; /* Low 16 bits of Group Id */
337 __le16 i_links_count; /* Links count */
338 __le32 i_blocks_lo; /* Blocks count */
339 __le32 i_flags; /* File flags */
340 union {
341 struct {
342 __le32 l_i_version;
343 } linux1;
344 struct {
345 __u32 h_i_translator;
346 } hurd1;
347 struct {
348 __u32 m_i_reserved1;
349 } masix1;
350 } osd1; /* OS dependent 1 */
351 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
352 __le32 i_generation; /* File version (for NFS) */
353 __le32 i_file_acl_lo; /* File ACL */
354 __le32 i_size_high;
355 __le32 i_obso_faddr; /* Obsoleted fragment address */
356 union {
357 struct {
358 __le16 l_i_blocks_high; /* were l_i_reserved1 */
359 __le16 l_i_file_acl_high;
360 __le16 l_i_uid_high; /* these 2 fields */
361 __le16 l_i_gid_high; /* were reserved2[0] */
362 __u32 l_i_reserved2;
363 } linux2;
364 struct {
365 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
366 __u16 h_i_mode_high;
367 __u16 h_i_uid_high;
368 __u16 h_i_gid_high;
369 __u32 h_i_author;
370 } hurd2;
371 struct {
372 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
373 __le16 m_i_file_acl_high;
374 __u32 m_i_reserved2[2];
375 } masix2;
376 } osd2; /* OS dependent 2 */
377 __le16 i_extra_isize;
378 __le16 i_pad1;
379 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
380 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
381 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
382 __le32 i_crtime; /* File Creation time */
383 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
384 __le32 i_version_hi; /* high 32 bits for 64-bit version */
385 };
386
387
388 #define EXT4_EPOCH_BITS 2
389 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
390 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
391
392 /*
393 * Extended fields will fit into an inode if the filesystem was formatted
394 * with large inodes (-I 256 or larger) and there are not currently any EAs
395 * consuming all of the available space. For new inodes we always reserve
396 * enough space for the kernel's known extended fields, but for inodes
397 * created with an old kernel this might not have been the case. None of
398 * the extended inode fields is critical for correct filesystem operation.
399 * This macro checks if a certain field fits in the inode. Note that
400 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
401 */
402 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
403 ((offsetof(typeof(*ext4_inode), field) + \
404 sizeof((ext4_inode)->field)) \
405 <= (EXT4_GOOD_OLD_INODE_SIZE + \
406 (einode)->i_extra_isize)) \
407
408 static inline __le32 ext4_encode_extra_time(struct timespec *time)
409 {
410 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
411 time->tv_sec >> 32 : 0) |
412 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
413 }
414
415 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
416 {
417 if (sizeof(time->tv_sec) > 4)
418 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
419 << 32;
420 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
421 }
422
423 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
424 do { \
425 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
426 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
427 (raw_inode)->xtime ## _extra = \
428 ext4_encode_extra_time(&(inode)->xtime); \
429 } while (0)
430
431 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
432 do { \
433 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
434 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
435 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
436 (raw_inode)->xtime ## _extra = \
437 ext4_encode_extra_time(&(einode)->xtime); \
438 } while (0)
439
440 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
441 do { \
442 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
443 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
444 ext4_decode_extra_time(&(inode)->xtime, \
445 raw_inode->xtime ## _extra); \
446 } while (0)
447
448 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
449 do { \
450 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
451 (einode)->xtime.tv_sec = \
452 (signed)le32_to_cpu((raw_inode)->xtime); \
453 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
454 ext4_decode_extra_time(&(einode)->xtime, \
455 raw_inode->xtime ## _extra); \
456 } while (0)
457
458 #define i_disk_version osd1.linux1.l_i_version
459
460 #if defined(__KERNEL__) || defined(__linux__)
461 #define i_reserved1 osd1.linux1.l_i_reserved1
462 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
463 #define i_blocks_high osd2.linux2.l_i_blocks_high
464 #define i_uid_low i_uid
465 #define i_gid_low i_gid
466 #define i_uid_high osd2.linux2.l_i_uid_high
467 #define i_gid_high osd2.linux2.l_i_gid_high
468 #define i_reserved2 osd2.linux2.l_i_reserved2
469
470 #elif defined(__GNU__)
471
472 #define i_translator osd1.hurd1.h_i_translator
473 #define i_uid_high osd2.hurd2.h_i_uid_high
474 #define i_gid_high osd2.hurd2.h_i_gid_high
475 #define i_author osd2.hurd2.h_i_author
476
477 #elif defined(__masix__)
478
479 #define i_reserved1 osd1.masix1.m_i_reserved1
480 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
481 #define i_reserved2 osd2.masix2.m_i_reserved2
482
483 #endif /* defined(__KERNEL__) || defined(__linux__) */
484
485 /*
486 * File system states
487 */
488 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
489 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
490 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
491
492 /*
493 * Mount flags
494 */
495 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
496 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
497 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
498 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
499 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
500 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
501 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
502 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
503 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
504 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
505 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
506 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
507 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
508 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
509 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
510 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
511 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
512 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
513 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
514 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
515 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
516 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
517 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
518 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
519 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
520 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
521 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
522 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
523 #define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
524 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
525 #ifndef _LINUX_EXT2_FS_H
526 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
527 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
528 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
529 EXT4_MOUNT_##opt)
530 #else
531 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
532 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
533 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
534 #endif
535
536 #define ext4_set_bit ext2_set_bit
537 #define ext4_set_bit_atomic ext2_set_bit_atomic
538 #define ext4_clear_bit ext2_clear_bit
539 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
540 #define ext4_test_bit ext2_test_bit
541 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
542 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
543 #define ext4_find_next_bit ext2_find_next_bit
544
545 /*
546 * Maximal mount counts between two filesystem checks
547 */
548 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
549 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
550
551 /*
552 * Behaviour when detecting errors
553 */
554 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
555 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
556 #define EXT4_ERRORS_PANIC 3 /* Panic */
557 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
558
559 /*
560 * Structure of the super block
561 */
562 struct ext4_super_block {
563 /*00*/ __le32 s_inodes_count; /* Inodes count */
564 __le32 s_blocks_count_lo; /* Blocks count */
565 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
566 __le32 s_free_blocks_count_lo; /* Free blocks count */
567 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
568 __le32 s_first_data_block; /* First Data Block */
569 __le32 s_log_block_size; /* Block size */
570 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
571 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
572 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
573 __le32 s_inodes_per_group; /* # Inodes per group */
574 __le32 s_mtime; /* Mount time */
575 /*30*/ __le32 s_wtime; /* Write time */
576 __le16 s_mnt_count; /* Mount count */
577 __le16 s_max_mnt_count; /* Maximal mount count */
578 __le16 s_magic; /* Magic signature */
579 __le16 s_state; /* File system state */
580 __le16 s_errors; /* Behaviour when detecting errors */
581 __le16 s_minor_rev_level; /* minor revision level */
582 /*40*/ __le32 s_lastcheck; /* time of last check */
583 __le32 s_checkinterval; /* max. time between checks */
584 __le32 s_creator_os; /* OS */
585 __le32 s_rev_level; /* Revision level */
586 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
587 __le16 s_def_resgid; /* Default gid for reserved blocks */
588 /*
589 * These fields are for EXT4_DYNAMIC_REV superblocks only.
590 *
591 * Note: the difference between the compatible feature set and
592 * the incompatible feature set is that if there is a bit set
593 * in the incompatible feature set that the kernel doesn't
594 * know about, it should refuse to mount the filesystem.
595 *
596 * e2fsck's requirements are more strict; if it doesn't know
597 * about a feature in either the compatible or incompatible
598 * feature set, it must abort and not try to meddle with
599 * things it doesn't understand...
600 */
601 __le32 s_first_ino; /* First non-reserved inode */
602 __le16 s_inode_size; /* size of inode structure */
603 __le16 s_block_group_nr; /* block group # of this superblock */
604 __le32 s_feature_compat; /* compatible feature set */
605 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
606 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
607 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
608 /*78*/ char s_volume_name[16]; /* volume name */
609 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
610 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
611 /*
612 * Performance hints. Directory preallocation should only
613 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
614 */
615 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
616 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
617 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
618 /*
619 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
620 */
621 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
622 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
623 __le32 s_journal_dev; /* device number of journal file */
624 __le32 s_last_orphan; /* start of list of inodes to delete */
625 __le32 s_hash_seed[4]; /* HTREE hash seed */
626 __u8 s_def_hash_version; /* Default hash version to use */
627 __u8 s_reserved_char_pad;
628 __le16 s_desc_size; /* size of group descriptor */
629 /*100*/ __le32 s_default_mount_opts;
630 __le32 s_first_meta_bg; /* First metablock block group */
631 __le32 s_mkfs_time; /* When the filesystem was created */
632 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
633 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
634 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
635 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
636 __le32 s_free_blocks_count_hi; /* Free blocks count */
637 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
638 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
639 __le32 s_flags; /* Miscellaneous flags */
640 __le16 s_raid_stride; /* RAID stride */
641 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
642 __le64 s_mmp_block; /* Block for multi-mount protection */
643 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
644 __u32 s_reserved[163]; /* Padding to the end of the block */
645 };
646
647 #ifdef __KERNEL__
648 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
649 {
650 return sb->s_fs_info;
651 }
652 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
653 {
654 return container_of(inode, struct ext4_inode_info, vfs_inode);
655 }
656
657 static inline struct timespec ext4_current_time(struct inode *inode)
658 {
659 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
660 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
661 }
662
663
664 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
665 {
666 return ino == EXT4_ROOT_INO ||
667 ino == EXT4_JOURNAL_INO ||
668 ino == EXT4_RESIZE_INO ||
669 (ino >= EXT4_FIRST_INO(sb) &&
670 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
671 }
672 #else
673 /* Assume that user mode programs are passing in an ext4fs superblock, not
674 * a kernel struct super_block. This will allow us to call the feature-test
675 * macros from user land. */
676 #define EXT4_SB(sb) (sb)
677 #endif
678
679 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
680
681 /*
682 * Codes for operating systems
683 */
684 #define EXT4_OS_LINUX 0
685 #define EXT4_OS_HURD 1
686 #define EXT4_OS_MASIX 2
687 #define EXT4_OS_FREEBSD 3
688 #define EXT4_OS_LITES 4
689
690 /*
691 * Revision levels
692 */
693 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
694 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
695
696 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
697 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
698
699 #define EXT4_GOOD_OLD_INODE_SIZE 128
700
701 /*
702 * Feature set definitions
703 */
704
705 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
706 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
707 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
708 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
709 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
710 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
711 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
712 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
713 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
714 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
715 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
716 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
717 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
718 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
719 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
720 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
721 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
722 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
723
724 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
725 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
726 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
727 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
728 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
729 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
730
731 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
732 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
733 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
734 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
735 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
736 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
737 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
738
739 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
740 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
741 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
742 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
743 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
744 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
745 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
746 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
747 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
748
749 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
750 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
751 EXT4_FEATURE_INCOMPAT_RECOVER| \
752 EXT4_FEATURE_INCOMPAT_META_BG| \
753 EXT4_FEATURE_INCOMPAT_EXTENTS| \
754 EXT4_FEATURE_INCOMPAT_64BIT| \
755 EXT4_FEATURE_INCOMPAT_FLEX_BG)
756 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
757 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
758 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
759 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
760 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
761 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
762 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
763
764 /*
765 * Default values for user and/or group using reserved blocks
766 */
767 #define EXT4_DEF_RESUID 0
768 #define EXT4_DEF_RESGID 0
769
770 /*
771 * Default mount options
772 */
773 #define EXT4_DEFM_DEBUG 0x0001
774 #define EXT4_DEFM_BSDGROUPS 0x0002
775 #define EXT4_DEFM_XATTR_USER 0x0004
776 #define EXT4_DEFM_ACL 0x0008
777 #define EXT4_DEFM_UID16 0x0010
778 #define EXT4_DEFM_JMODE 0x0060
779 #define EXT4_DEFM_JMODE_DATA 0x0020
780 #define EXT4_DEFM_JMODE_ORDERED 0x0040
781 #define EXT4_DEFM_JMODE_WBACK 0x0060
782
783 /*
784 * Structure of a directory entry
785 */
786 #define EXT4_NAME_LEN 255
787
788 struct ext4_dir_entry {
789 __le32 inode; /* Inode number */
790 __le16 rec_len; /* Directory entry length */
791 __le16 name_len; /* Name length */
792 char name[EXT4_NAME_LEN]; /* File name */
793 };
794
795 /*
796 * The new version of the directory entry. Since EXT4 structures are
797 * stored in intel byte order, and the name_len field could never be
798 * bigger than 255 chars, it's safe to reclaim the extra byte for the
799 * file_type field.
800 */
801 struct ext4_dir_entry_2 {
802 __le32 inode; /* Inode number */
803 __le16 rec_len; /* Directory entry length */
804 __u8 name_len; /* Name length */
805 __u8 file_type;
806 char name[EXT4_NAME_LEN]; /* File name */
807 };
808
809 /*
810 * Ext4 directory file types. Only the low 3 bits are used. The
811 * other bits are reserved for now.
812 */
813 #define EXT4_FT_UNKNOWN 0
814 #define EXT4_FT_REG_FILE 1
815 #define EXT4_FT_DIR 2
816 #define EXT4_FT_CHRDEV 3
817 #define EXT4_FT_BLKDEV 4
818 #define EXT4_FT_FIFO 5
819 #define EXT4_FT_SOCK 6
820 #define EXT4_FT_SYMLINK 7
821
822 #define EXT4_FT_MAX 8
823
824 /*
825 * EXT4_DIR_PAD defines the directory entries boundaries
826 *
827 * NOTE: It must be a multiple of 4
828 */
829 #define EXT4_DIR_PAD 4
830 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
831 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
832 ~EXT4_DIR_ROUND)
833 #define EXT4_MAX_REC_LEN ((1<<16)-1)
834
835 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
836 {
837 unsigned len = le16_to_cpu(dlen);
838
839 if (len == EXT4_MAX_REC_LEN)
840 return 1 << 16;
841 return len;
842 }
843
844 static inline __le16 ext4_rec_len_to_disk(unsigned len)
845 {
846 if (len == (1 << 16))
847 return cpu_to_le16(EXT4_MAX_REC_LEN);
848 else if (len > (1 << 16))
849 BUG();
850 return cpu_to_le16(len);
851 }
852
853 /*
854 * Hash Tree Directory indexing
855 * (c) Daniel Phillips, 2001
856 */
857
858 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
859 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
860 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
861 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
862 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
863
864 /* Legal values for the dx_root hash_version field: */
865
866 #define DX_HASH_LEGACY 0
867 #define DX_HASH_HALF_MD4 1
868 #define DX_HASH_TEA 2
869
870 #ifdef __KERNEL__
871
872 /* hash info structure used by the directory hash */
873 struct dx_hash_info
874 {
875 u32 hash;
876 u32 minor_hash;
877 int hash_version;
878 u32 *seed;
879 };
880
881 #define EXT4_HTREE_EOF 0x7fffffff
882
883 /*
884 * Control parameters used by ext4_htree_next_block
885 */
886 #define HASH_NB_ALWAYS 1
887
888
889 /*
890 * Describe an inode's exact location on disk and in memory
891 */
892 struct ext4_iloc
893 {
894 struct buffer_head *bh;
895 unsigned long offset;
896 ext4_group_t block_group;
897 };
898
899 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
900 {
901 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
902 }
903
904 /*
905 * This structure is stuffed into the struct file's private_data field
906 * for directories. It is where we put information so that we can do
907 * readdir operations in hash tree order.
908 */
909 struct dir_private_info {
910 struct rb_root root;
911 struct rb_node *curr_node;
912 struct fname *extra_fname;
913 loff_t last_pos;
914 __u32 curr_hash;
915 __u32 curr_minor_hash;
916 __u32 next_hash;
917 };
918
919 /* calculate the first block number of the group */
920 static inline ext4_fsblk_t
921 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
922 {
923 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
924 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
925 }
926
927 /*
928 * Special error return code only used by dx_probe() and its callers.
929 */
930 #define ERR_BAD_DX_DIR -75000
931
932 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
933 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
934
935 /*
936 * Function prototypes
937 */
938
939 /*
940 * Ok, these declarations are also in <linux/kernel.h> but none of the
941 * ext4 source programs needs to include it so they are duplicated here.
942 */
943 # define NORET_TYPE /**/
944 # define ATTRIB_NORET __attribute__((noreturn))
945 # define NORET_AND noreturn,
946
947 /* balloc.c */
948 extern unsigned int ext4_block_group(struct super_block *sb,
949 ext4_fsblk_t blocknr);
950 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
951 ext4_fsblk_t blocknr);
952 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
953 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
954 ext4_group_t group);
955 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
956 ext4_fsblk_t goal, int *errp);
957 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
958 ext4_fsblk_t goal, unsigned long *count, int *errp);
959 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
960 ext4_fsblk_t goal, unsigned long *count, int *errp);
961 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
962 ext4_fsblk_t block, unsigned long count, int metadata);
963 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
964 ext4_fsblk_t block, unsigned long count,
965 unsigned long *pdquot_freed_blocks);
966 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
967 extern void ext4_check_blocks_bitmap (struct super_block *);
968 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
969 ext4_group_t block_group,
970 struct buffer_head ** bh);
971 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
972 extern void ext4_init_block_alloc_info(struct inode *);
973 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
974
975 /* dir.c */
976 extern int ext4_check_dir_entry(const char *, struct inode *,
977 struct ext4_dir_entry_2 *,
978 struct buffer_head *, unsigned long);
979 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
980 __u32 minor_hash,
981 struct ext4_dir_entry_2 *dirent);
982 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
983
984 /* fsync.c */
985 extern int ext4_sync_file (struct file *, struct dentry *, int);
986
987 /* hash.c */
988 extern int ext4fs_dirhash(const char *name, int len, struct
989 dx_hash_info *hinfo);
990
991 /* ialloc.c */
992 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
993 extern void ext4_free_inode (handle_t *, struct inode *);
994 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
995 extern unsigned long ext4_count_free_inodes (struct super_block *);
996 extern unsigned long ext4_count_dirs (struct super_block *);
997 extern void ext4_check_inodes_bitmap (struct super_block *);
998 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
999
1000 /* mballoc.c */
1001 extern long ext4_mb_stats;
1002 extern long ext4_mb_max_to_scan;
1003 extern int ext4_mb_init(struct super_block *, int);
1004 extern int ext4_mb_release(struct super_block *);
1005 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1006 struct ext4_allocation_request *, int *);
1007 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1008 extern void ext4_mb_discard_inode_preallocations(struct inode *);
1009 extern int __init init_ext4_mballoc(void);
1010 extern void exit_ext4_mballoc(void);
1011 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1012 unsigned long, unsigned long, int, unsigned long *);
1013
1014
1015 /* inode.c */
1016 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1017 struct buffer_head *bh, ext4_fsblk_t blocknr);
1018 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1019 ext4_lblk_t, int, int *);
1020 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1021 ext4_lblk_t, int, int *);
1022 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1023 ext4_lblk_t iblock, unsigned long maxblocks,
1024 struct buffer_head *bh_result,
1025 int create, int extend_disksize);
1026
1027 extern void ext4_read_inode (struct inode *);
1028 extern int ext4_write_inode (struct inode *, int);
1029 extern int ext4_setattr (struct dentry *, struct iattr *);
1030 extern void ext4_delete_inode (struct inode *);
1031 extern int ext4_sync_inode (handle_t *, struct inode *);
1032 extern void ext4_discard_reservation (struct inode *);
1033 extern void ext4_dirty_inode(struct inode *);
1034 extern int ext4_change_inode_journal_flag(struct inode *, int);
1035 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1036 extern void ext4_truncate (struct inode *);
1037 extern void ext4_set_inode_flags(struct inode *);
1038 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1039 extern void ext4_set_aops(struct inode *inode);
1040 extern int ext4_writepage_trans_blocks(struct inode *);
1041 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1042 struct address_space *mapping, loff_t from);
1043
1044 /* ioctl.c */
1045 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
1046 unsigned long);
1047 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1048
1049 /* migrate.c */
1050 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1051 unsigned long);
1052 /* namei.c */
1053 extern int ext4_orphan_add(handle_t *, struct inode *);
1054 extern int ext4_orphan_del(handle_t *, struct inode *);
1055 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1056 __u32 start_minor_hash, __u32 *next_hash);
1057
1058 /* resize.c */
1059 extern int ext4_group_add(struct super_block *sb,
1060 struct ext4_new_group_data *input);
1061 extern int ext4_group_extend(struct super_block *sb,
1062 struct ext4_super_block *es,
1063 ext4_fsblk_t n_blocks_count);
1064
1065 /* super.c */
1066 extern void ext4_error (struct super_block *, const char *, const char *, ...)
1067 __attribute__ ((format (printf, 3, 4)));
1068 extern void __ext4_std_error (struct super_block *, const char *, int);
1069 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1070 __attribute__ ((format (printf, 3, 4)));
1071 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1072 __attribute__ ((format (printf, 3, 4)));
1073 extern void ext4_update_dynamic_rev (struct super_block *sb);
1074 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1075 __u32 compat);
1076 extern int ext4_update_rocompat_feature(handle_t *handle,
1077 struct super_block *sb, __u32 rocompat);
1078 extern int ext4_update_incompat_feature(handle_t *handle,
1079 struct super_block *sb, __u32 incompat);
1080 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1081 struct ext4_group_desc *bg);
1082 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1083 struct ext4_group_desc *bg);
1084 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1085 struct ext4_group_desc *bg);
1086 extern void ext4_block_bitmap_set(struct super_block *sb,
1087 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1088 extern void ext4_inode_bitmap_set(struct super_block *sb,
1089 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1090 extern void ext4_inode_table_set(struct super_block *sb,
1091 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1092
1093 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1094 {
1095 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1096 le32_to_cpu(es->s_blocks_count_lo);
1097 }
1098
1099 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1100 {
1101 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1102 le32_to_cpu(es->s_r_blocks_count_lo);
1103 }
1104
1105 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1106 {
1107 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1108 le32_to_cpu(es->s_free_blocks_count_lo);
1109 }
1110
1111 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1112 ext4_fsblk_t blk)
1113 {
1114 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1115 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1116 }
1117
1118 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1119 ext4_fsblk_t blk)
1120 {
1121 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1122 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1123 }
1124
1125 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1126 ext4_fsblk_t blk)
1127 {
1128 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1129 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1130 }
1131
1132 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1133 {
1134 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1135 le32_to_cpu(raw_inode->i_size_lo);
1136 }
1137
1138 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1139 {
1140 raw_inode->i_size_lo = cpu_to_le32(i_size);
1141 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1142 }
1143
1144 static inline
1145 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1146 ext4_group_t group)
1147 {
1148 struct ext4_group_info ***grp_info;
1149 long indexv, indexh;
1150 grp_info = EXT4_SB(sb)->s_group_info;
1151 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1152 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1153 return grp_info[indexv][indexh];
1154 }
1155
1156
1157 #define ext4_std_error(sb, errno) \
1158 do { \
1159 if ((errno)) \
1160 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1161 } while (0)
1162
1163 /*
1164 * Inodes and files operations
1165 */
1166
1167 /* dir.c */
1168 extern const struct file_operations ext4_dir_operations;
1169
1170 /* file.c */
1171 extern const struct inode_operations ext4_file_inode_operations;
1172 extern const struct file_operations ext4_file_operations;
1173
1174 /* namei.c */
1175 extern const struct inode_operations ext4_dir_inode_operations;
1176 extern const struct inode_operations ext4_special_inode_operations;
1177
1178 /* symlink.c */
1179 extern const struct inode_operations ext4_symlink_inode_operations;
1180 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1181
1182 /* extents.c */
1183 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1184 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1185 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1186 ext4_lblk_t iblock,
1187 unsigned long max_blocks, struct buffer_head *bh_result,
1188 int create, int extend_disksize);
1189 extern void ext4_ext_truncate(struct inode *, struct page *);
1190 extern void ext4_ext_init(struct super_block *);
1191 extern void ext4_ext_release(struct super_block *);
1192 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1193 loff_t len);
1194 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1195 sector_t block, unsigned long max_blocks,
1196 struct buffer_head *bh, int create,
1197 int extend_disksize);
1198 #endif /* __KERNEL__ */
1199
1200 #endif /* _LINUX_EXT4_FS_H */
WRT350N Kernel Patches