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libata-link: separate out link initialization functions
[pv_ops_mirror.git] / include / linux / ext4_fs.h
blobcdee7aaa57aa60952281c54320f7a9bf0fa936fb
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 65000
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 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
206
207 /* Used to pass group descriptor data when online resize is done */
208 struct ext4_new_group_input {
209 __u32 group; /* Group number for this data */
210 __u64 block_bitmap; /* Absolute block number of block bitmap */
211 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
212 __u64 inode_table; /* Absolute block number of inode table start */
213 __u32 blocks_count; /* Total number of blocks in this group */
214 __u16 reserved_blocks; /* Number of reserved blocks in this group */
215 __u16 unused;
216 };
217
218 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
219 struct ext4_new_group_data {
220 __u32 group;
221 __u64 block_bitmap;
222 __u64 inode_bitmap;
223 __u64 inode_table;
224 __u32 blocks_count;
225 __u16 reserved_blocks;
226 __u16 unused;
227 __u32 free_blocks_count;
228 };
229
230 /*
231 * Following is used by preallocation code to tell get_blocks() that we
232 * want uninitialzed extents.
233 */
234 #define EXT4_CREATE_UNINITIALIZED_EXT 2
235
236 /*
237 * ioctl commands
238 */
239 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
240 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
241 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
242 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
243 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
244 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
245 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
246 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
247 #ifdef CONFIG_JBD2_DEBUG
248 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
249 #endif
250 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
251 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
252
253 /*
254 * ioctl commands in 32 bit emulation
255 */
256 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
257 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
258 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
259 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
260 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
261 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
262 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
263 #ifdef CONFIG_JBD2_DEBUG
264 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
265 #endif
266 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
267 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
268
269
270 /*
271 * Mount options
272 */
273 struct ext4_mount_options {
274 unsigned long s_mount_opt;
275 uid_t s_resuid;
276 gid_t s_resgid;
277 unsigned long s_commit_interval;
278 #ifdef CONFIG_QUOTA
279 int s_jquota_fmt;
280 char *s_qf_names[MAXQUOTAS];
281 #endif
282 };
283
284 /*
285 * Structure of an inode on the disk
286 */
287 struct ext4_inode {
288 __le16 i_mode; /* File mode */
289 __le16 i_uid; /* Low 16 bits of Owner Uid */
290 __le32 i_size; /* Size in bytes */
291 __le32 i_atime; /* Access time */
292 __le32 i_ctime; /* Inode Change time */
293 __le32 i_mtime; /* Modification time */
294 __le32 i_dtime; /* Deletion Time */
295 __le16 i_gid; /* Low 16 bits of Group Id */
296 __le16 i_links_count; /* Links count */
297 __le32 i_blocks; /* Blocks count */
298 __le32 i_flags; /* File flags */
299 union {
300 struct {
301 __u32 l_i_reserved1;
302 } linux1;
303 struct {
304 __u32 h_i_translator;
305 } hurd1;
306 struct {
307 __u32 m_i_reserved1;
308 } masix1;
309 } osd1; /* OS dependent 1 */
310 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
311 __le32 i_generation; /* File version (for NFS) */
312 __le32 i_file_acl; /* File ACL */
313 __le32 i_dir_acl; /* Directory ACL */
314 __le32 i_faddr; /* Fragment address */
315 union {
316 struct {
317 __u8 l_i_frag; /* Fragment number */
318 __u8 l_i_fsize; /* Fragment size */
319 __le16 l_i_file_acl_high;
320 __le16 l_i_uid_high; /* these 2 fields */
321 __le16 l_i_gid_high; /* were reserved2[0] */
322 __u32 l_i_reserved2;
323 } linux2;
324 struct {
325 __u8 h_i_frag; /* Fragment number */
326 __u8 h_i_fsize; /* Fragment size */
327 __u16 h_i_mode_high;
328 __u16 h_i_uid_high;
329 __u16 h_i_gid_high;
330 __u32 h_i_author;
331 } hurd2;
332 struct {
333 __u8 m_i_frag; /* Fragment number */
334 __u8 m_i_fsize; /* Fragment size */
335 __le16 m_i_file_acl_high;
336 __u32 m_i_reserved2[2];
337 } masix2;
338 } osd2; /* OS dependent 2 */
339 __le16 i_extra_isize;
340 __le16 i_pad1;
341 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
342 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
343 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
344 __le32 i_crtime; /* File Creation time */
345 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
346 };
347
348 #define i_size_high i_dir_acl
349
350 #define EXT4_EPOCH_BITS 2
351 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
352 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
353
354 /*
355 * Extended fields will fit into an inode if the filesystem was formatted
356 * with large inodes (-I 256 or larger) and there are not currently any EAs
357 * consuming all of the available space. For new inodes we always reserve
358 * enough space for the kernel's known extended fields, but for inodes
359 * created with an old kernel this might not have been the case. None of
360 * the extended inode fields is critical for correct filesystem operation.
361 * This macro checks if a certain field fits in the inode. Note that
362 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
363 */
364 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
365 ((offsetof(typeof(*ext4_inode), field) + \
366 sizeof((ext4_inode)->field)) \
367 <= (EXT4_GOOD_OLD_INODE_SIZE + \
368 (einode)->i_extra_isize)) \
369
370 static inline __le32 ext4_encode_extra_time(struct timespec *time)
371 {
372 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
373 time->tv_sec >> 32 : 0) |
374 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
375 }
376
377 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
378 {
379 if (sizeof(time->tv_sec) > 4)
380 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
381 << 32;
382 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
383 }
384
385 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
386 do { \
387 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
388 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
389 (raw_inode)->xtime ## _extra = \
390 ext4_encode_extra_time(&(inode)->xtime); \
391 } while (0)
392
393 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
394 do { \
395 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
396 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
397 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
398 (raw_inode)->xtime ## _extra = \
399 ext4_encode_extra_time(&(einode)->xtime); \
400 } while (0)
401
402 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
403 do { \
404 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
405 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
406 ext4_decode_extra_time(&(inode)->xtime, \
407 raw_inode->xtime ## _extra); \
408 } while (0)
409
410 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
411 do { \
412 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
413 (einode)->xtime.tv_sec = \
414 (signed)le32_to_cpu((raw_inode)->xtime); \
415 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
416 ext4_decode_extra_time(&(einode)->xtime, \
417 raw_inode->xtime ## _extra); \
418 } while (0)
419
420 #if defined(__KERNEL__) || defined(__linux__)
421 #define i_reserved1 osd1.linux1.l_i_reserved1
422 #define i_frag osd2.linux2.l_i_frag
423 #define i_fsize osd2.linux2.l_i_fsize
424 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
425 #define i_uid_low i_uid
426 #define i_gid_low i_gid
427 #define i_uid_high osd2.linux2.l_i_uid_high
428 #define i_gid_high osd2.linux2.l_i_gid_high
429 #define i_reserved2 osd2.linux2.l_i_reserved2
430
431 #elif defined(__GNU__)
432
433 #define i_translator osd1.hurd1.h_i_translator
434 #define i_frag osd2.hurd2.h_i_frag;
435 #define i_fsize osd2.hurd2.h_i_fsize;
436 #define i_uid_high osd2.hurd2.h_i_uid_high
437 #define i_gid_high osd2.hurd2.h_i_gid_high
438 #define i_author osd2.hurd2.h_i_author
439
440 #elif defined(__masix__)
441
442 #define i_reserved1 osd1.masix1.m_i_reserved1
443 #define i_frag osd2.masix2.m_i_frag
444 #define i_fsize osd2.masix2.m_i_fsize
445 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
446 #define i_reserved2 osd2.masix2.m_i_reserved2
447
448 #endif /* defined(__KERNEL__) || defined(__linux__) */
449
450 /*
451 * File system states
452 */
453 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
454 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
455 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
456
457 /*
458 * Mount flags
459 */
460 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
461 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
462 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
463 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
464 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
465 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
466 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
467 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
468 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
469 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
470 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
471 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
472 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
473 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
474 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
475 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
476 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
477 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
478 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
479 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
480 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
481 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
482 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
483 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
484 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
485
486 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
487 #ifndef _LINUX_EXT2_FS_H
488 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
489 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
490 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
491 EXT4_MOUNT_##opt)
492 #else
493 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
494 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
495 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
496 #endif
497
498 #define ext4_set_bit ext2_set_bit
499 #define ext4_set_bit_atomic ext2_set_bit_atomic
500 #define ext4_clear_bit ext2_clear_bit
501 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
502 #define ext4_test_bit ext2_test_bit
503 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
504 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
505
506 /*
507 * Maximal mount counts between two filesystem checks
508 */
509 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
510 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
511
512 /*
513 * Behaviour when detecting errors
514 */
515 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
516 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
517 #define EXT4_ERRORS_PANIC 3 /* Panic */
518 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
519
520 /*
521 * Structure of the super block
522 */
523 struct ext4_super_block {
524 /*00*/ __le32 s_inodes_count; /* Inodes count */
525 __le32 s_blocks_count; /* Blocks count */
526 __le32 s_r_blocks_count; /* Reserved blocks count */
527 __le32 s_free_blocks_count; /* Free blocks count */
528 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
529 __le32 s_first_data_block; /* First Data Block */
530 __le32 s_log_block_size; /* Block size */
531 __le32 s_log_frag_size; /* Fragment size */
532 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
533 __le32 s_frags_per_group; /* # Fragments per group */
534 __le32 s_inodes_per_group; /* # Inodes per group */
535 __le32 s_mtime; /* Mount time */
536 /*30*/ __le32 s_wtime; /* Write time */
537 __le16 s_mnt_count; /* Mount count */
538 __le16 s_max_mnt_count; /* Maximal mount count */
539 __le16 s_magic; /* Magic signature */
540 __le16 s_state; /* File system state */
541 __le16 s_errors; /* Behaviour when detecting errors */
542 __le16 s_minor_rev_level; /* minor revision level */
543 /*40*/ __le32 s_lastcheck; /* time of last check */
544 __le32 s_checkinterval; /* max. time between checks */
545 __le32 s_creator_os; /* OS */
546 __le32 s_rev_level; /* Revision level */
547 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
548 __le16 s_def_resgid; /* Default gid for reserved blocks */
549 /*
550 * These fields are for EXT4_DYNAMIC_REV superblocks only.
551 *
552 * Note: the difference between the compatible feature set and
553 * the incompatible feature set is that if there is a bit set
554 * in the incompatible feature set that the kernel doesn't
555 * know about, it should refuse to mount the filesystem.
556 *
557 * e2fsck's requirements are more strict; if it doesn't know
558 * about a feature in either the compatible or incompatible
559 * feature set, it must abort and not try to meddle with
560 * things it doesn't understand...
561 */
562 __le32 s_first_ino; /* First non-reserved inode */
563 __le16 s_inode_size; /* size of inode structure */
564 __le16 s_block_group_nr; /* block group # of this superblock */
565 __le32 s_feature_compat; /* compatible feature set */
566 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
567 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
568 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
569 /*78*/ char s_volume_name[16]; /* volume name */
570 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
571 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
572 /*
573 * Performance hints. Directory preallocation should only
574 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
575 */
576 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
577 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
578 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
579 /*
580 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
581 */
582 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
583 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
584 __le32 s_journal_dev; /* device number of journal file */
585 __le32 s_last_orphan; /* start of list of inodes to delete */
586 __le32 s_hash_seed[4]; /* HTREE hash seed */
587 __u8 s_def_hash_version; /* Default hash version to use */
588 __u8 s_reserved_char_pad;
589 __le16 s_desc_size; /* size of group descriptor */
590 /*100*/ __le32 s_default_mount_opts;
591 __le32 s_first_meta_bg; /* First metablock block group */
592 __le32 s_mkfs_time; /* When the filesystem was created */
593 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
594 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
595 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
596 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
597 __le32 s_free_blocks_count_hi; /* Free blocks count */
598 __u16 s_min_extra_isize; /* All inodes have at least # bytes */
599 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
600 __u32 s_flags; /* Miscellaneous flags */
601 __u16 s_raid_stride; /* RAID stride */
602 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */
603 __u64 s_mmp_block; /* Block for multi-mount protection */
604 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
605 __u32 s_reserved[163]; /* Padding to the end of the block */
606 };
607
608 #ifdef __KERNEL__
609 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
610 {
611 return sb->s_fs_info;
612 }
613 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
614 {
615 return container_of(inode, struct ext4_inode_info, vfs_inode);
616 }
617
618 static inline struct timespec ext4_current_time(struct inode *inode)
619 {
620 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
621 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
622 }
623
624
625 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
626 {
627 return ino == EXT4_ROOT_INO ||
628 ino == EXT4_JOURNAL_INO ||
629 ino == EXT4_RESIZE_INO ||
630 (ino >= EXT4_FIRST_INO(sb) &&
631 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
632 }
633 #else
634 /* Assume that user mode programs are passing in an ext4fs superblock, not
635 * a kernel struct super_block. This will allow us to call the feature-test
636 * macros from user land. */
637 #define EXT4_SB(sb) (sb)
638 #endif
639
640 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
641
642 /*
643 * Codes for operating systems
644 */
645 #define EXT4_OS_LINUX 0
646 #define EXT4_OS_HURD 1
647 #define EXT4_OS_MASIX 2
648 #define EXT4_OS_FREEBSD 3
649 #define EXT4_OS_LITES 4
650
651 /*
652 * Revision levels
653 */
654 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
655 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
656
657 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
658 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
659
660 #define EXT4_GOOD_OLD_INODE_SIZE 128
661
662 /*
663 * Feature set definitions
664 */
665
666 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
667 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
668 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
669 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
670 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
671 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
672 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
673 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
674 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
675 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
676 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
677 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
678 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
679 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
680 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
681 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
682 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
683 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
684
685 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
686 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
687 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
688 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
689 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
690 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
691
692 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
693 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
694 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
695 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
696 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
697
698 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
699 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
700 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
701 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
702 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
703 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
704 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
705
706 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
707 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
708 EXT4_FEATURE_INCOMPAT_RECOVER| \
709 EXT4_FEATURE_INCOMPAT_META_BG| \
710 EXT4_FEATURE_INCOMPAT_EXTENTS| \
711 EXT4_FEATURE_INCOMPAT_64BIT)
712 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
713 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
714 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
715 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
716 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
717
718 /*
719 * Default values for user and/or group using reserved blocks
720 */
721 #define EXT4_DEF_RESUID 0
722 #define EXT4_DEF_RESGID 0
723
724 /*
725 * Default mount options
726 */
727 #define EXT4_DEFM_DEBUG 0x0001
728 #define EXT4_DEFM_BSDGROUPS 0x0002
729 #define EXT4_DEFM_XATTR_USER 0x0004
730 #define EXT4_DEFM_ACL 0x0008
731 #define EXT4_DEFM_UID16 0x0010
732 #define EXT4_DEFM_JMODE 0x0060
733 #define EXT4_DEFM_JMODE_DATA 0x0020
734 #define EXT4_DEFM_JMODE_ORDERED 0x0040
735 #define EXT4_DEFM_JMODE_WBACK 0x0060
736
737 /*
738 * Structure of a directory entry
739 */
740 #define EXT4_NAME_LEN 255
741
742 struct ext4_dir_entry {
743 __le32 inode; /* Inode number */
744 __le16 rec_len; /* Directory entry length */
745 __le16 name_len; /* Name length */
746 char name[EXT4_NAME_LEN]; /* File name */
747 };
748
749 /*
750 * The new version of the directory entry. Since EXT4 structures are
751 * stored in intel byte order, and the name_len field could never be
752 * bigger than 255 chars, it's safe to reclaim the extra byte for the
753 * file_type field.
754 */
755 struct ext4_dir_entry_2 {
756 __le32 inode; /* Inode number */
757 __le16 rec_len; /* Directory entry length */
758 __u8 name_len; /* Name length */
759 __u8 file_type;
760 char name[EXT4_NAME_LEN]; /* File name */
761 };
762
763 /*
764 * Ext4 directory file types. Only the low 3 bits are used. The
765 * other bits are reserved for now.
766 */
767 #define EXT4_FT_UNKNOWN 0
768 #define EXT4_FT_REG_FILE 1
769 #define EXT4_FT_DIR 2
770 #define EXT4_FT_CHRDEV 3
771 #define EXT4_FT_BLKDEV 4
772 #define EXT4_FT_FIFO 5
773 #define EXT4_FT_SOCK 6
774 #define EXT4_FT_SYMLINK 7
775
776 #define EXT4_FT_MAX 8
777
778 /*
779 * EXT4_DIR_PAD defines the directory entries boundaries
780 *
781 * NOTE: It must be a multiple of 4
782 */
783 #define EXT4_DIR_PAD 4
784 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
785 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
786 ~EXT4_DIR_ROUND)
787 /*
788 * Hash Tree Directory indexing
789 * (c) Daniel Phillips, 2001
790 */
791
792 #ifdef CONFIG_EXT4_INDEX
793 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
794 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
795 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
796 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
797 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
798 #else
799 #define is_dx(dir) 0
800 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
801 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
802 #endif
803
804 /* Legal values for the dx_root hash_version field: */
805
806 #define DX_HASH_LEGACY 0
807 #define DX_HASH_HALF_MD4 1
808 #define DX_HASH_TEA 2
809
810 #ifdef __KERNEL__
811
812 /* hash info structure used by the directory hash */
813 struct dx_hash_info
814 {
815 u32 hash;
816 u32 minor_hash;
817 int hash_version;
818 u32 *seed;
819 };
820
821 #define EXT4_HTREE_EOF 0x7fffffff
822
823 /*
824 * Control parameters used by ext4_htree_next_block
825 */
826 #define HASH_NB_ALWAYS 1
827
828
829 /*
830 * Describe an inode's exact location on disk and in memory
831 */
832 struct ext4_iloc
833 {
834 struct buffer_head *bh;
835 unsigned long offset;
836 unsigned long block_group;
837 };
838
839 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
840 {
841 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
842 }
843
844 /*
845 * This structure is stuffed into the struct file's private_data field
846 * for directories. It is where we put information so that we can do
847 * readdir operations in hash tree order.
848 */
849 struct dir_private_info {
850 struct rb_root root;
851 struct rb_node *curr_node;
852 struct fname *extra_fname;
853 loff_t last_pos;
854 __u32 curr_hash;
855 __u32 curr_minor_hash;
856 __u32 next_hash;
857 };
858
859 /* calculate the first block number of the group */
860 static inline ext4_fsblk_t
861 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
862 {
863 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
864 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
865 }
866
867 /*
868 * Special error return code only used by dx_probe() and its callers.
869 */
870 #define ERR_BAD_DX_DIR -75000
871
872 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
873 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
874
875 /*
876 * Function prototypes
877 */
878
879 /*
880 * Ok, these declarations are also in <linux/kernel.h> but none of the
881 * ext4 source programs needs to include it so they are duplicated here.
882 */
883 # define NORET_TYPE /**/
884 # define ATTRIB_NORET __attribute__((noreturn))
885 # define NORET_AND noreturn,
886
887 /* balloc.c */
888 extern unsigned int ext4_block_group(struct super_block *sb,
889 ext4_fsblk_t blocknr);
890 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
891 ext4_fsblk_t blocknr);
892 extern int ext4_bg_has_super(struct super_block *sb, int group);
893 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
894 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
895 ext4_fsblk_t goal, int *errp);
896 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
897 ext4_fsblk_t goal, unsigned long *count, int *errp);
898 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
899 ext4_fsblk_t block, unsigned long count);
900 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
901 ext4_fsblk_t block, unsigned long count,
902 unsigned long *pdquot_freed_blocks);
903 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
904 extern void ext4_check_blocks_bitmap (struct super_block *);
905 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
906 unsigned int block_group,
907 struct buffer_head ** bh);
908 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
909 extern void ext4_init_block_alloc_info(struct inode *);
910 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
911
912 /* dir.c */
913 extern int ext4_check_dir_entry(const char *, struct inode *,
914 struct ext4_dir_entry_2 *,
915 struct buffer_head *, unsigned long);
916 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
917 __u32 minor_hash,
918 struct ext4_dir_entry_2 *dirent);
919 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
920
921 /* fsync.c */
922 extern int ext4_sync_file (struct file *, struct dentry *, int);
923
924 /* hash.c */
925 extern int ext4fs_dirhash(const char *name, int len, struct
926 dx_hash_info *hinfo);
927
928 /* ialloc.c */
929 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
930 extern void ext4_free_inode (handle_t *, struct inode *);
931 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
932 extern unsigned long ext4_count_free_inodes (struct super_block *);
933 extern unsigned long ext4_count_dirs (struct super_block *);
934 extern void ext4_check_inodes_bitmap (struct super_block *);
935 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
936
937
938 /* inode.c */
939 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
940 struct buffer_head *bh, ext4_fsblk_t blocknr);
941 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
942 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
943 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
944 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
945 int create, int extend_disksize);
946
947 extern void ext4_read_inode (struct inode *);
948 extern int ext4_write_inode (struct inode *, int);
949 extern int ext4_setattr (struct dentry *, struct iattr *);
950 extern void ext4_delete_inode (struct inode *);
951 extern int ext4_sync_inode (handle_t *, struct inode *);
952 extern void ext4_discard_reservation (struct inode *);
953 extern void ext4_dirty_inode(struct inode *);
954 extern int ext4_change_inode_journal_flag(struct inode *, int);
955 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
956 extern void ext4_truncate (struct inode *);
957 extern void ext4_set_inode_flags(struct inode *);
958 extern void ext4_get_inode_flags(struct ext4_inode_info *);
959 extern void ext4_set_aops(struct inode *inode);
960 extern int ext4_writepage_trans_blocks(struct inode *);
961 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
962 struct address_space *mapping, loff_t from);
963
964 /* ioctl.c */
965 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
966 unsigned long);
967 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
968
969 /* namei.c */
970 extern int ext4_orphan_add(handle_t *, struct inode *);
971 extern int ext4_orphan_del(handle_t *, struct inode *);
972 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
973 __u32 start_minor_hash, __u32 *next_hash);
974
975 /* resize.c */
976 extern int ext4_group_add(struct super_block *sb,
977 struct ext4_new_group_data *input);
978 extern int ext4_group_extend(struct super_block *sb,
979 struct ext4_super_block *es,
980 ext4_fsblk_t n_blocks_count);
981
982 /* super.c */
983 extern void ext4_error (struct super_block *, const char *, const char *, ...)
984 __attribute__ ((format (printf, 3, 4)));
985 extern void __ext4_std_error (struct super_block *, const char *, int);
986 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
987 __attribute__ ((format (printf, 3, 4)));
988 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
989 __attribute__ ((format (printf, 3, 4)));
990 extern void ext4_update_dynamic_rev (struct super_block *sb);
991 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
992 struct ext4_group_desc *bg);
993 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
994 struct ext4_group_desc *bg);
995 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
996 struct ext4_group_desc *bg);
997 extern void ext4_block_bitmap_set(struct super_block *sb,
998 struct ext4_group_desc *bg, ext4_fsblk_t blk);
999 extern void ext4_inode_bitmap_set(struct super_block *sb,
1000 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1001 extern void ext4_inode_table_set(struct super_block *sb,
1002 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1003
1004 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1005 {
1006 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1007 le32_to_cpu(es->s_blocks_count);
1008 }
1009
1010 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1011 {
1012 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1013 le32_to_cpu(es->s_r_blocks_count);
1014 }
1015
1016 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1017 {
1018 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1019 le32_to_cpu(es->s_free_blocks_count);
1020 }
1021
1022 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1023 ext4_fsblk_t blk)
1024 {
1025 es->s_blocks_count = cpu_to_le32((u32)blk);
1026 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1027 }
1028
1029 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1030 ext4_fsblk_t blk)
1031 {
1032 es->s_free_blocks_count = cpu_to_le32((u32)blk);
1033 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1034 }
1035
1036 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1037 ext4_fsblk_t blk)
1038 {
1039 es->s_r_blocks_count = cpu_to_le32((u32)blk);
1040 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1041 }
1042
1043
1044
1045 #define ext4_std_error(sb, errno) \
1046 do { \
1047 if ((errno)) \
1048 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1049 } while (0)
1050
1051 /*
1052 * Inodes and files operations
1053 */
1054
1055 /* dir.c */
1056 extern const struct file_operations ext4_dir_operations;
1057
1058 /* file.c */
1059 extern const struct inode_operations ext4_file_inode_operations;
1060 extern const struct file_operations ext4_file_operations;
1061
1062 /* namei.c */
1063 extern const struct inode_operations ext4_dir_inode_operations;
1064 extern const struct inode_operations ext4_special_inode_operations;
1065
1066 /* symlink.c */
1067 extern const struct inode_operations ext4_symlink_inode_operations;
1068 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1069
1070 /* extents.c */
1071 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1072 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1073 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1074 ext4_fsblk_t iblock,
1075 unsigned long max_blocks, struct buffer_head *bh_result,
1076 int create, int extend_disksize);
1077 extern void ext4_ext_truncate(struct inode *, struct page *);
1078 extern void ext4_ext_init(struct super_block *);
1079 extern void ext4_ext_release(struct super_block *);
1080 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1081 loff_t len);
1082 static inline int
1083 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1084 unsigned long max_blocks, struct buffer_head *bh,
1085 int create, int extend_disksize)
1086 {
1087 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
1088 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
1089 bh, create, extend_disksize);
1090 return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
1091 create, extend_disksize);
1092 }
1093
1094
1095 #endif /* __KERNEL__ */
1096
1097 #endif /* _LINUX_EXT4_FS_H */
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