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ext4: Add nanosecond timestamps
[linux-2.6/x86.git] / include / linux / ext4_fs.h
blobdf5e38faa15fbac9f7d4fe4813c609e769d68e48
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 /*
24 * The second extended filesystem constants/structures
25 */
26
27 /*
28 * Define EXT4FS_DEBUG to produce debug messages
29 */
30 #undef EXT4FS_DEBUG
31
32 /*
33 * Define EXT4_RESERVATION to reserve data blocks for expanding files
34 */
35 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
37 #define EXT4_MAX_RESERVE_BLOCKS 1027
38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
39 /*
40 * Always enable hashed directories
41 */
42 #define CONFIG_EXT4_INDEX
43
44 /*
45 * Debug code
46 */
47 #ifdef EXT4FS_DEBUG
48 #define ext4_debug(f, a...) \
49 do { \
50 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
51 __FILE__, __LINE__, __FUNCTION__); \
52 printk (KERN_DEBUG f, ## a); \
53 } while (0)
54 #else
55 #define ext4_debug(f, a...) do {} while (0)
56 #endif
57
58 /*
59 * Special inodes numbers
60 */
61 #define EXT4_BAD_INO 1 /* Bad blocks inode */
62 #define EXT4_ROOT_INO 2 /* Root inode */
63 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
64 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
65 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
66 #define EXT4_JOURNAL_INO 8 /* Journal inode */
67
68 /* First non-reserved inode for old ext4 filesystems */
69 #define EXT4_GOOD_OLD_FIRST_INO 11
70
71 /*
72 * Maximal count of links to a file
73 */
74 #define EXT4_LINK_MAX 32000
75
76 /*
77 * Macro-instructions used to manage several block sizes
78 */
79 #define EXT4_MIN_BLOCK_SIZE 1024
80 #define EXT4_MAX_BLOCK_SIZE 4096
81 #define EXT4_MIN_BLOCK_LOG_SIZE 10
82 #ifdef __KERNEL__
83 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
84 #else
85 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
86 #endif
87 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
88 #ifdef __KERNEL__
89 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
90 #else
91 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
92 #endif
93 #ifdef __KERNEL__
94 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
95 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
96 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
97 #else
98 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
99 EXT4_GOOD_OLD_INODE_SIZE : \
100 (s)->s_inode_size)
101 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
102 EXT4_GOOD_OLD_FIRST_INO : \
103 (s)->s_first_ino)
104 #endif
105 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
106
107 /*
108 * Macro-instructions used to manage fragments
109 */
110 #define EXT4_MIN_FRAG_SIZE 1024
111 #define EXT4_MAX_FRAG_SIZE 4096
112 #define EXT4_MIN_FRAG_LOG_SIZE 10
113 #ifdef __KERNEL__
114 # define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size)
115 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block)
116 #else
117 # define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
118 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
119 #endif
120
121 /*
122 * Structure of a blocks group descriptor
123 */
124 struct ext4_group_desc
125 {
126 __le32 bg_block_bitmap; /* Blocks bitmap block */
127 __le32 bg_inode_bitmap; /* Inodes bitmap block */
128 __le32 bg_inode_table; /* Inodes table block */
129 __le16 bg_free_blocks_count; /* Free blocks count */
130 __le16 bg_free_inodes_count; /* Free inodes count */
131 __le16 bg_used_dirs_count; /* Directories count */
132 __u16 bg_flags;
133 __u32 bg_reserved[3];
134 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
135 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
136 __le32 bg_inode_table_hi; /* Inodes table block MSB */
137 };
138
139 #ifdef __KERNEL__
140 #include <linux/ext4_fs_i.h>
141 #include <linux/ext4_fs_sb.h>
142 #endif
143 /*
144 * Macro-instructions used to manage group descriptors
145 */
146 #define EXT4_MIN_DESC_SIZE 32
147 #define EXT4_MIN_DESC_SIZE_64BIT 64
148 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
149 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
150 #ifdef __KERNEL__
151 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
152 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
153 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
154 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
155 #else
156 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
157 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
158 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
159 #endif
160
161 /*
162 * Constants relative to the data blocks
163 */
164 #define EXT4_NDIR_BLOCKS 12
165 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
166 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
167 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
168 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
169
170 /*
171 * Inode flags
172 */
173 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
174 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
175 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
176 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
177 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
178 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
179 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
180 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
181 /* Reserved for compression usage... */
182 #define EXT4_DIRTY_FL 0x00000100
183 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
184 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
185 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
186 /* End compression flags --- maybe not all used */
187 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
188 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
189 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
190 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
191 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
192 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
193 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
194 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
195
196 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
197 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
198
199 /*
200 * Inode dynamic state flags
201 */
202 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
203 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
204 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
205
206 /* Used to pass group descriptor data when online resize is done */
207 struct ext4_new_group_input {
208 __u32 group; /* Group number for this data */
209 __u64 block_bitmap; /* Absolute block number of block bitmap */
210 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
211 __u64 inode_table; /* Absolute block number of inode table start */
212 __u32 blocks_count; /* Total number of blocks in this group */
213 __u16 reserved_blocks; /* Number of reserved blocks in this group */
214 __u16 unused;
215 };
216
217 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
218 struct ext4_new_group_data {
219 __u32 group;
220 __u64 block_bitmap;
221 __u64 inode_bitmap;
222 __u64 inode_table;
223 __u32 blocks_count;
224 __u16 reserved_blocks;
225 __u16 unused;
226 __u32 free_blocks_count;
227 };
228
229 /*
230 * Following is used by preallocation code to tell get_blocks() that we
231 * want uninitialzed extents.
232 */
233 #define EXT4_CREATE_UNINITIALIZED_EXT 2
234
235 /*
236 * ioctl commands
237 */
238 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
239 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
240 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
241 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
242 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
243 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
244 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
245 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
246 #ifdef CONFIG_JBD2_DEBUG
247 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
248 #endif
249 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
250 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
251
252 /*
253 * ioctl commands in 32 bit emulation
254 */
255 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
256 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
257 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
258 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
259 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
260 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
261 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
262 #ifdef CONFIG_JBD2_DEBUG
263 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
264 #endif
265 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
266 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
267
268
269 /*
270 * Mount options
271 */
272 struct ext4_mount_options {
273 unsigned long s_mount_opt;
274 uid_t s_resuid;
275 gid_t s_resgid;
276 unsigned long s_commit_interval;
277 #ifdef CONFIG_QUOTA
278 int s_jquota_fmt;
279 char *s_qf_names[MAXQUOTAS];
280 #endif
281 };
282
283 /*
284 * Structure of an inode on the disk
285 */
286 struct ext4_inode {
287 __le16 i_mode; /* File mode */
288 __le16 i_uid; /* Low 16 bits of Owner Uid */
289 __le32 i_size; /* Size in bytes */
290 __le32 i_atime; /* Access time */
291 __le32 i_ctime; /* Inode Change time */
292 __le32 i_mtime; /* Modification time */
293 __le32 i_dtime; /* Deletion Time */
294 __le16 i_gid; /* Low 16 bits of Group Id */
295 __le16 i_links_count; /* Links count */
296 __le32 i_blocks; /* Blocks count */
297 __le32 i_flags; /* File flags */
298 union {
299 struct {
300 __u32 l_i_reserved1;
301 } linux1;
302 struct {
303 __u32 h_i_translator;
304 } hurd1;
305 struct {
306 __u32 m_i_reserved1;
307 } masix1;
308 } osd1; /* OS dependent 1 */
309 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
310 __le32 i_generation; /* File version (for NFS) */
311 __le32 i_file_acl; /* File ACL */
312 __le32 i_dir_acl; /* Directory ACL */
313 __le32 i_faddr; /* Fragment address */
314 union {
315 struct {
316 __u8 l_i_frag; /* Fragment number */
317 __u8 l_i_fsize; /* Fragment size */
318 __le16 l_i_file_acl_high;
319 __le16 l_i_uid_high; /* these 2 fields */
320 __le16 l_i_gid_high; /* were reserved2[0] */
321 __u32 l_i_reserved2;
322 } linux2;
323 struct {
324 __u8 h_i_frag; /* Fragment number */
325 __u8 h_i_fsize; /* Fragment size */
326 __u16 h_i_mode_high;
327 __u16 h_i_uid_high;
328 __u16 h_i_gid_high;
329 __u32 h_i_author;
330 } hurd2;
331 struct {
332 __u8 m_i_frag; /* Fragment number */
333 __u8 m_i_fsize; /* Fragment size */
334 __le16 m_i_file_acl_high;
335 __u32 m_i_reserved2[2];
336 } masix2;
337 } osd2; /* OS dependent 2 */
338 __le16 i_extra_isize;
339 __le16 i_pad1;
340 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
341 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
342 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
343 __le32 i_crtime; /* File Creation time */
344 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
345 };
346
347 #define i_size_high i_dir_acl
348
349 #define EXT4_EPOCH_BITS 2
350 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
351 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
352
353 /*
354 * Extended fields will fit into an inode if the filesystem was formatted
355 * with large inodes (-I 256 or larger) and there are not currently any EAs
356 * consuming all of the available space. For new inodes we always reserve
357 * enough space for the kernel's known extended fields, but for inodes
358 * created with an old kernel this might not have been the case. None of
359 * the extended inode fields is critical for correct filesystem operation.
360 * This macro checks if a certain field fits in the inode. Note that
361 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
362 */
363 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
364 ((offsetof(typeof(*ext4_inode), field) + \
365 sizeof((ext4_inode)->field)) \
366 <= (EXT4_GOOD_OLD_INODE_SIZE + \
367 (einode)->i_extra_isize)) \
368
369 static inline __le32 ext4_encode_extra_time(struct timespec *time)
370 {
371 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
372 time->tv_sec >> 32 : 0) |
373 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
374 }
375
376 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
377 {
378 if (sizeof(time->tv_sec) > 4)
379 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
380 << 32;
381 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
382 }
383
384 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
385 do { \
386 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
387 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
388 (raw_inode)->xtime ## _extra = \
389 ext4_encode_extra_time(&(inode)->xtime); \
390 } while (0)
391
392 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
393 do { \
394 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
395 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
396 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
397 (raw_inode)->xtime ## _extra = \
398 ext4_encode_extra_time(&(einode)->xtime); \
399 } while (0)
400
401 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
402 do { \
403 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
404 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
405 ext4_decode_extra_time(&(inode)->xtime, \
406 raw_inode->xtime ## _extra); \
407 } while (0)
408
409 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
410 do { \
411 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
412 (einode)->xtime.tv_sec = \
413 (signed)le32_to_cpu((raw_inode)->xtime); \
414 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
415 ext4_decode_extra_time(&(einode)->xtime, \
416 raw_inode->xtime ## _extra); \
417 } while (0)
418
419 #if defined(__KERNEL__) || defined(__linux__)
420 #define i_reserved1 osd1.linux1.l_i_reserved1
421 #define i_frag osd2.linux2.l_i_frag
422 #define i_fsize osd2.linux2.l_i_fsize
423 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
424 #define i_uid_low i_uid
425 #define i_gid_low i_gid
426 #define i_uid_high osd2.linux2.l_i_uid_high
427 #define i_gid_high osd2.linux2.l_i_gid_high
428 #define i_reserved2 osd2.linux2.l_i_reserved2
429
430 #elif defined(__GNU__)
431
432 #define i_translator osd1.hurd1.h_i_translator
433 #define i_frag osd2.hurd2.h_i_frag;
434 #define i_fsize osd2.hurd2.h_i_fsize;
435 #define i_uid_high osd2.hurd2.h_i_uid_high
436 #define i_gid_high osd2.hurd2.h_i_gid_high
437 #define i_author osd2.hurd2.h_i_author
438
439 #elif defined(__masix__)
440
441 #define i_reserved1 osd1.masix1.m_i_reserved1
442 #define i_frag osd2.masix2.m_i_frag
443 #define i_fsize osd2.masix2.m_i_fsize
444 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
445 #define i_reserved2 osd2.masix2.m_i_reserved2
446
447 #endif /* defined(__KERNEL__) || defined(__linux__) */
448
449 /*
450 * File system states
451 */
452 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
453 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
454 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
455
456 /*
457 * Mount flags
458 */
459 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
460 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
461 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
462 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
463 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
464 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
465 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
466 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
467 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
468 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
469 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
470 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
471 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
472 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
473 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
474 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
475 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
476 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
477 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
478 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
479 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
480 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
481 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
482 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
483 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
484
485 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
486 #ifndef _LINUX_EXT2_FS_H
487 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
488 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
489 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
490 EXT4_MOUNT_##opt)
491 #else
492 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
493 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
494 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
495 #endif
496
497 #define ext4_set_bit ext2_set_bit
498 #define ext4_set_bit_atomic ext2_set_bit_atomic
499 #define ext4_clear_bit ext2_clear_bit
500 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
501 #define ext4_test_bit ext2_test_bit
502 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
503 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
504
505 /*
506 * Maximal mount counts between two filesystem checks
507 */
508 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
509 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
510
511 /*
512 * Behaviour when detecting errors
513 */
514 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
515 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
516 #define EXT4_ERRORS_PANIC 3 /* Panic */
517 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
518
519 /*
520 * Structure of the super block
521 */
522 struct ext4_super_block {
523 /*00*/ __le32 s_inodes_count; /* Inodes count */
524 __le32 s_blocks_count; /* Blocks count */
525 __le32 s_r_blocks_count; /* Reserved blocks count */
526 __le32 s_free_blocks_count; /* Free blocks count */
527 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
528 __le32 s_first_data_block; /* First Data Block */
529 __le32 s_log_block_size; /* Block size */
530 __le32 s_log_frag_size; /* Fragment size */
531 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
532 __le32 s_frags_per_group; /* # Fragments per group */
533 __le32 s_inodes_per_group; /* # Inodes per group */
534 __le32 s_mtime; /* Mount time */
535 /*30*/ __le32 s_wtime; /* Write time */
536 __le16 s_mnt_count; /* Mount count */
537 __le16 s_max_mnt_count; /* Maximal mount count */
538 __le16 s_magic; /* Magic signature */
539 __le16 s_state; /* File system state */
540 __le16 s_errors; /* Behaviour when detecting errors */
541 __le16 s_minor_rev_level; /* minor revision level */
542 /*40*/ __le32 s_lastcheck; /* time of last check */
543 __le32 s_checkinterval; /* max. time between checks */
544 __le32 s_creator_os; /* OS */
545 __le32 s_rev_level; /* Revision level */
546 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
547 __le16 s_def_resgid; /* Default gid for reserved blocks */
548 /*
549 * These fields are for EXT4_DYNAMIC_REV superblocks only.
550 *
551 * Note: the difference between the compatible feature set and
552 * the incompatible feature set is that if there is a bit set
553 * in the incompatible feature set that the kernel doesn't
554 * know about, it should refuse to mount the filesystem.
555 *
556 * e2fsck's requirements are more strict; if it doesn't know
557 * about a feature in either the compatible or incompatible
558 * feature set, it must abort and not try to meddle with
559 * things it doesn't understand...
560 */
561 __le32 s_first_ino; /* First non-reserved inode */
562 __le16 s_inode_size; /* size of inode structure */
563 __le16 s_block_group_nr; /* block group # of this superblock */
564 __le32 s_feature_compat; /* compatible feature set */
565 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
566 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
567 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
568 /*78*/ char s_volume_name[16]; /* volume name */
569 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
570 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
571 /*
572 * Performance hints. Directory preallocation should only
573 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
574 */
575 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
576 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
577 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
578 /*
579 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
580 */
581 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
582 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
583 __le32 s_journal_dev; /* device number of journal file */
584 __le32 s_last_orphan; /* start of list of inodes to delete */
585 __le32 s_hash_seed[4]; /* HTREE hash seed */
586 __u8 s_def_hash_version; /* Default hash version to use */
587 __u8 s_reserved_char_pad;
588 __le16 s_desc_size; /* size of group descriptor */
589 /*100*/ __le32 s_default_mount_opts;
590 __le32 s_first_meta_bg; /* First metablock block group */
591 __le32 s_mkfs_time; /* When the filesystem was created */
592 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
593 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
594 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
595 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
596 __le32 s_free_blocks_count_hi; /* Free blocks count */
597 __u16 s_min_extra_isize; /* All inodes have at least # bytes */
598 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
599 __u32 s_flags; /* Miscellaneous flags */
600 __u16 s_raid_stride; /* RAID stride */
601 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */
602 __u64 s_mmp_block; /* Block for multi-mount protection */
603 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
604 __u32 s_reserved[163]; /* Padding to the end of the block */
605 };
606
607 #ifdef __KERNEL__
608 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
609 {
610 return sb->s_fs_info;
611 }
612 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
613 {
614 return container_of(inode, struct ext4_inode_info, vfs_inode);
615 }
616
617 static inline struct timespec ext4_current_time(struct inode *inode)
618 {
619 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
620 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
621 }
622
623
624 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
625 {
626 return ino == EXT4_ROOT_INO ||
627 ino == EXT4_JOURNAL_INO ||
628 ino == EXT4_RESIZE_INO ||
629 (ino >= EXT4_FIRST_INO(sb) &&
630 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
631 }
632 #else
633 /* Assume that user mode programs are passing in an ext4fs superblock, not
634 * a kernel struct super_block. This will allow us to call the feature-test
635 * macros from user land. */
636 #define EXT4_SB(sb) (sb)
637 #endif
638
639 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
640
641 /*
642 * Codes for operating systems
643 */
644 #define EXT4_OS_LINUX 0
645 #define EXT4_OS_HURD 1
646 #define EXT4_OS_MASIX 2
647 #define EXT4_OS_FREEBSD 3
648 #define EXT4_OS_LITES 4
649
650 /*
651 * Revision levels
652 */
653 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
654 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
655
656 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
657 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
658
659 #define EXT4_GOOD_OLD_INODE_SIZE 128
660
661 /*
662 * Feature set definitions
663 */
664
665 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
666 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
667 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
668 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
669 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
670 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
671 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
672 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
673 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
674 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
675 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
676 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
677 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
678 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
679 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
680 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
681 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
682 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
683
684 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
685 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
686 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
687 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
688 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
689 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
690
691 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
692 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
693 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
694 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
695
696 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
697 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
698 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
699 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
700 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
701 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
702 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
703
704 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
705 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
706 EXT4_FEATURE_INCOMPAT_RECOVER| \
707 EXT4_FEATURE_INCOMPAT_META_BG| \
708 EXT4_FEATURE_INCOMPAT_EXTENTS| \
709 EXT4_FEATURE_INCOMPAT_64BIT)
710 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
711 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
712 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
713 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
714
715 /*
716 * Default values for user and/or group using reserved blocks
717 */
718 #define EXT4_DEF_RESUID 0
719 #define EXT4_DEF_RESGID 0
720
721 /*
722 * Default mount options
723 */
724 #define EXT4_DEFM_DEBUG 0x0001
725 #define EXT4_DEFM_BSDGROUPS 0x0002
726 #define EXT4_DEFM_XATTR_USER 0x0004
727 #define EXT4_DEFM_ACL 0x0008
728 #define EXT4_DEFM_UID16 0x0010
729 #define EXT4_DEFM_JMODE 0x0060
730 #define EXT4_DEFM_JMODE_DATA 0x0020
731 #define EXT4_DEFM_JMODE_ORDERED 0x0040
732 #define EXT4_DEFM_JMODE_WBACK 0x0060
733
734 /*
735 * Structure of a directory entry
736 */
737 #define EXT4_NAME_LEN 255
738
739 struct ext4_dir_entry {
740 __le32 inode; /* Inode number */
741 __le16 rec_len; /* Directory entry length */
742 __le16 name_len; /* Name length */
743 char name[EXT4_NAME_LEN]; /* File name */
744 };
745
746 /*
747 * The new version of the directory entry. Since EXT4 structures are
748 * stored in intel byte order, and the name_len field could never be
749 * bigger than 255 chars, it's safe to reclaim the extra byte for the
750 * file_type field.
751 */
752 struct ext4_dir_entry_2 {
753 __le32 inode; /* Inode number */
754 __le16 rec_len; /* Directory entry length */
755 __u8 name_len; /* Name length */
756 __u8 file_type;
757 char name[EXT4_NAME_LEN]; /* File name */
758 };
759
760 /*
761 * Ext4 directory file types. Only the low 3 bits are used. The
762 * other bits are reserved for now.
763 */
764 #define EXT4_FT_UNKNOWN 0
765 #define EXT4_FT_REG_FILE 1
766 #define EXT4_FT_DIR 2
767 #define EXT4_FT_CHRDEV 3
768 #define EXT4_FT_BLKDEV 4
769 #define EXT4_FT_FIFO 5
770 #define EXT4_FT_SOCK 6
771 #define EXT4_FT_SYMLINK 7
772
773 #define EXT4_FT_MAX 8
774
775 /*
776 * EXT4_DIR_PAD defines the directory entries boundaries
777 *
778 * NOTE: It must be a multiple of 4
779 */
780 #define EXT4_DIR_PAD 4
781 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
782 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
783 ~EXT4_DIR_ROUND)
784 /*
785 * Hash Tree Directory indexing
786 * (c) Daniel Phillips, 2001
787 */
788
789 #ifdef CONFIG_EXT4_INDEX
790 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
791 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
792 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
793 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
794 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
795 #else
796 #define is_dx(dir) 0
797 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
798 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
799 #endif
800
801 /* Legal values for the dx_root hash_version field: */
802
803 #define DX_HASH_LEGACY 0
804 #define DX_HASH_HALF_MD4 1
805 #define DX_HASH_TEA 2
806
807 #ifdef __KERNEL__
808
809 /* hash info structure used by the directory hash */
810 struct dx_hash_info
811 {
812 u32 hash;
813 u32 minor_hash;
814 int hash_version;
815 u32 *seed;
816 };
817
818 #define EXT4_HTREE_EOF 0x7fffffff
819
820 /*
821 * Control parameters used by ext4_htree_next_block
822 */
823 #define HASH_NB_ALWAYS 1
824
825
826 /*
827 * Describe an inode's exact location on disk and in memory
828 */
829 struct ext4_iloc
830 {
831 struct buffer_head *bh;
832 unsigned long offset;
833 unsigned long block_group;
834 };
835
836 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
837 {
838 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
839 }
840
841 /*
842 * This structure is stuffed into the struct file's private_data field
843 * for directories. It is where we put information so that we can do
844 * readdir operations in hash tree order.
845 */
846 struct dir_private_info {
847 struct rb_root root;
848 struct rb_node *curr_node;
849 struct fname *extra_fname;
850 loff_t last_pos;
851 __u32 curr_hash;
852 __u32 curr_minor_hash;
853 __u32 next_hash;
854 };
855
856 /* calculate the first block number of the group */
857 static inline ext4_fsblk_t
858 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
859 {
860 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
861 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
862 }
863
864 /*
865 * Special error return code only used by dx_probe() and its callers.
866 */
867 #define ERR_BAD_DX_DIR -75000
868
869 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
870 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
871
872 /*
873 * Function prototypes
874 */
875
876 /*
877 * Ok, these declarations are also in <linux/kernel.h> but none of the
878 * ext4 source programs needs to include it so they are duplicated here.
879 */
880 # define NORET_TYPE /**/
881 # define ATTRIB_NORET __attribute__((noreturn))
882 # define NORET_AND noreturn,
883
884 /* balloc.c */
885 extern unsigned int ext4_block_group(struct super_block *sb,
886 ext4_fsblk_t blocknr);
887 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
888 ext4_fsblk_t blocknr);
889 extern int ext4_bg_has_super(struct super_block *sb, int group);
890 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
891 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
892 ext4_fsblk_t goal, int *errp);
893 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
894 ext4_fsblk_t goal, unsigned long *count, int *errp);
895 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
896 ext4_fsblk_t block, unsigned long count);
897 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
898 ext4_fsblk_t block, unsigned long count,
899 unsigned long *pdquot_freed_blocks);
900 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
901 extern void ext4_check_blocks_bitmap (struct super_block *);
902 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
903 unsigned int block_group,
904 struct buffer_head ** bh);
905 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
906 extern void ext4_init_block_alloc_info(struct inode *);
907 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
908
909 /* dir.c */
910 extern int ext4_check_dir_entry(const char *, struct inode *,
911 struct ext4_dir_entry_2 *,
912 struct buffer_head *, unsigned long);
913 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
914 __u32 minor_hash,
915 struct ext4_dir_entry_2 *dirent);
916 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
917
918 /* fsync.c */
919 extern int ext4_sync_file (struct file *, struct dentry *, int);
920
921 /* hash.c */
922 extern int ext4fs_dirhash(const char *name, int len, struct
923 dx_hash_info *hinfo);
924
925 /* ialloc.c */
926 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
927 extern void ext4_free_inode (handle_t *, struct inode *);
928 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
929 extern unsigned long ext4_count_free_inodes (struct super_block *);
930 extern unsigned long ext4_count_dirs (struct super_block *);
931 extern void ext4_check_inodes_bitmap (struct super_block *);
932 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
933
934
935 /* inode.c */
936 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
937 struct buffer_head *bh, ext4_fsblk_t blocknr);
938 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
939 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
940 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
941 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
942 int create, int extend_disksize);
943
944 extern void ext4_read_inode (struct inode *);
945 extern int ext4_write_inode (struct inode *, int);
946 extern int ext4_setattr (struct dentry *, struct iattr *);
947 extern void ext4_delete_inode (struct inode *);
948 extern int ext4_sync_inode (handle_t *, struct inode *);
949 extern void ext4_discard_reservation (struct inode *);
950 extern void ext4_dirty_inode(struct inode *);
951 extern int ext4_change_inode_journal_flag(struct inode *, int);
952 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
953 extern void ext4_truncate (struct inode *);
954 extern void ext4_set_inode_flags(struct inode *);
955 extern void ext4_get_inode_flags(struct ext4_inode_info *);
956 extern void ext4_set_aops(struct inode *inode);
957 extern int ext4_writepage_trans_blocks(struct inode *);
958 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
959 struct address_space *mapping, loff_t from);
960
961 /* ioctl.c */
962 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
963 unsigned long);
964 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
965
966 /* namei.c */
967 extern int ext4_orphan_add(handle_t *, struct inode *);
968 extern int ext4_orphan_del(handle_t *, struct inode *);
969 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
970 __u32 start_minor_hash, __u32 *next_hash);
971
972 /* resize.c */
973 extern int ext4_group_add(struct super_block *sb,
974 struct ext4_new_group_data *input);
975 extern int ext4_group_extend(struct super_block *sb,
976 struct ext4_super_block *es,
977 ext4_fsblk_t n_blocks_count);
978
979 /* super.c */
980 extern void ext4_error (struct super_block *, const char *, const char *, ...)
981 __attribute__ ((format (printf, 3, 4)));
982 extern void __ext4_std_error (struct super_block *, const char *, int);
983 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
984 __attribute__ ((format (printf, 3, 4)));
985 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
986 __attribute__ ((format (printf, 3, 4)));
987 extern void ext4_update_dynamic_rev (struct super_block *sb);
988 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
989 struct ext4_group_desc *bg);
990 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
991 struct ext4_group_desc *bg);
992 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
993 struct ext4_group_desc *bg);
994 extern void ext4_block_bitmap_set(struct super_block *sb,
995 struct ext4_group_desc *bg, ext4_fsblk_t blk);
996 extern void ext4_inode_bitmap_set(struct super_block *sb,
997 struct ext4_group_desc *bg, ext4_fsblk_t blk);
998 extern void ext4_inode_table_set(struct super_block *sb,
999 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1000
1001 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1002 {
1003 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1004 le32_to_cpu(es->s_blocks_count);
1005 }
1006
1007 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1008 {
1009 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1010 le32_to_cpu(es->s_r_blocks_count);
1011 }
1012
1013 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1014 {
1015 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1016 le32_to_cpu(es->s_free_blocks_count);
1017 }
1018
1019 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1020 ext4_fsblk_t blk)
1021 {
1022 es->s_blocks_count = cpu_to_le32((u32)blk);
1023 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1024 }
1025
1026 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1027 ext4_fsblk_t blk)
1028 {
1029 es->s_free_blocks_count = cpu_to_le32((u32)blk);
1030 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1031 }
1032
1033 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1034 ext4_fsblk_t blk)
1035 {
1036 es->s_r_blocks_count = cpu_to_le32((u32)blk);
1037 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1038 }
1039
1040
1041
1042 #define ext4_std_error(sb, errno) \
1043 do { \
1044 if ((errno)) \
1045 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1046 } while (0)
1047
1048 /*
1049 * Inodes and files operations
1050 */
1051
1052 /* dir.c */
1053 extern const struct file_operations ext4_dir_operations;
1054
1055 /* file.c */
1056 extern const struct inode_operations ext4_file_inode_operations;
1057 extern const struct file_operations ext4_file_operations;
1058
1059 /* namei.c */
1060 extern const struct inode_operations ext4_dir_inode_operations;
1061 extern const struct inode_operations ext4_special_inode_operations;
1062
1063 /* symlink.c */
1064 extern const struct inode_operations ext4_symlink_inode_operations;
1065 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1066
1067 /* extents.c */
1068 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1069 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1070 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1071 ext4_fsblk_t iblock,
1072 unsigned long max_blocks, struct buffer_head *bh_result,
1073 int create, int extend_disksize);
1074 extern void ext4_ext_truncate(struct inode *, struct page *);
1075 extern void ext4_ext_init(struct super_block *);
1076 extern void ext4_ext_release(struct super_block *);
1077 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1078 loff_t len);
1079 static inline int
1080 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1081 unsigned long max_blocks, struct buffer_head *bh,
1082 int create, int extend_disksize)
1083 {
1084 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
1085 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
1086 bh, create, extend_disksize);
1087 return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
1088 create, extend_disksize);
1089 }
1090
1091
1092 #endif /* __KERNEL__ */
1093
1094 #endif /* _LINUX_EXT4_FS_H */
x86 "subsystem" repository