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[PATCH] rename net_random to random32
[linux-2.6/linux-loongson.git] / include / linux / ext4_fs.h
blob498503ee613d9d6d6b08d59f75f898320d1cf4ca
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
106 /*
107 * Macro-instructions used to manage fragments
108 */
109 #define EXT4_MIN_FRAG_SIZE 1024
110 #define EXT4_MAX_FRAG_SIZE 4096
111 #define EXT4_MIN_FRAG_LOG_SIZE 10
112 #ifdef __KERNEL__
113 # define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size)
114 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block)
115 #else
116 # define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
117 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
118 #endif
119
120 /*
121 * Structure of a blocks group descriptor
122 */
123 struct ext4_group_desc
124 {
125 __le32 bg_block_bitmap; /* Blocks bitmap block */
126 __le32 bg_inode_bitmap; /* Inodes bitmap block */
127 __le32 bg_inode_table; /* Inodes table block */
128 __le16 bg_free_blocks_count; /* Free blocks count */
129 __le16 bg_free_inodes_count; /* Free inodes count */
130 __le16 bg_used_dirs_count; /* Directories count */
131 __u16 bg_flags;
132 __u32 bg_reserved[3];
133 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
134 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
135 __le32 bg_inode_table_hi; /* Inodes table block MSB */
136 };
137
138 #ifdef __KERNEL__
139 #include <linux/ext4_fs_i.h>
140 #include <linux/ext4_fs_sb.h>
141 #endif
142 /*
143 * Macro-instructions used to manage group descriptors
144 */
145 #define EXT4_MIN_DESC_SIZE 32
146 #define EXT4_MIN_DESC_SIZE_64BIT 64
147 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
148 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
149 #ifdef __KERNEL__
150 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
151 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
152 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
153 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
154 #else
155 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
156 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
157 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
158 #endif
159
160 /*
161 * Constants relative to the data blocks
162 */
163 #define EXT4_NDIR_BLOCKS 12
164 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
165 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
166 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
167 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
168
169 /*
170 * Inode flags
171 */
172 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
173 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
174 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
175 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
176 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
177 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
178 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
179 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
180 /* Reserved for compression usage... */
181 #define EXT4_DIRTY_FL 0x00000100
182 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
183 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
184 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
185 /* End compression flags --- maybe not all used */
186 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
187 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
188 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
189 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
190 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
191 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
192 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
193 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
194
195 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
196 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
197
198 /*
199 * Inode dynamic state flags
200 */
201 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
202 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
203 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
204
205 /* Used to pass group descriptor data when online resize is done */
206 struct ext4_new_group_input {
207 __u32 group; /* Group number for this data */
208 __u64 block_bitmap; /* Absolute block number of block bitmap */
209 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
210 __u64 inode_table; /* Absolute block number of inode table start */
211 __u32 blocks_count; /* Total number of blocks in this group */
212 __u16 reserved_blocks; /* Number of reserved blocks in this group */
213 __u16 unused;
214 };
215
216 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
217 struct ext4_new_group_data {
218 __u32 group;
219 __u64 block_bitmap;
220 __u64 inode_bitmap;
221 __u64 inode_table;
222 __u32 blocks_count;
223 __u16 reserved_blocks;
224 __u16 unused;
225 __u32 free_blocks_count;
226 };
227
228
229 /*
230 * ioctl commands
231 */
232 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
233 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
234 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
235 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
236 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
237 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
238 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
239 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
240 #ifdef CONFIG_JBD_DEBUG
241 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
242 #endif
243 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
244 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
245
246 /*
247 * ioctl commands in 32 bit emulation
248 */
249 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
250 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
251 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
252 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
253 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
254 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
255 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
256 #ifdef CONFIG_JBD_DEBUG
257 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
258 #endif
259 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
260 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
261
262
263 /*
264 * Mount options
265 */
266 struct ext4_mount_options {
267 unsigned long s_mount_opt;
268 uid_t s_resuid;
269 gid_t s_resgid;
270 unsigned long s_commit_interval;
271 #ifdef CONFIG_QUOTA
272 int s_jquota_fmt;
273 char *s_qf_names[MAXQUOTAS];
274 #endif
275 };
276
277 /*
278 * Structure of an inode on the disk
279 */
280 struct ext4_inode {
281 __le16 i_mode; /* File mode */
282 __le16 i_uid; /* Low 16 bits of Owner Uid */
283 __le32 i_size; /* Size in bytes */
284 __le32 i_atime; /* Access time */
285 __le32 i_ctime; /* Creation time */
286 __le32 i_mtime; /* Modification time */
287 __le32 i_dtime; /* Deletion Time */
288 __le16 i_gid; /* Low 16 bits of Group Id */
289 __le16 i_links_count; /* Links count */
290 __le32 i_blocks; /* Blocks count */
291 __le32 i_flags; /* File flags */
292 union {
293 struct {
294 __u32 l_i_reserved1;
295 } linux1;
296 struct {
297 __u32 h_i_translator;
298 } hurd1;
299 struct {
300 __u32 m_i_reserved1;
301 } masix1;
302 } osd1; /* OS dependent 1 */
303 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
304 __le32 i_generation; /* File version (for NFS) */
305 __le32 i_file_acl; /* File ACL */
306 __le32 i_dir_acl; /* Directory ACL */
307 __le32 i_faddr; /* Fragment address */
308 union {
309 struct {
310 __u8 l_i_frag; /* Fragment number */
311 __u8 l_i_fsize; /* Fragment size */
312 __le16 l_i_file_acl_high;
313 __le16 l_i_uid_high; /* these 2 fields */
314 __le16 l_i_gid_high; /* were reserved2[0] */
315 __u32 l_i_reserved2;
316 } linux2;
317 struct {
318 __u8 h_i_frag; /* Fragment number */
319 __u8 h_i_fsize; /* Fragment size */
320 __u16 h_i_mode_high;
321 __u16 h_i_uid_high;
322 __u16 h_i_gid_high;
323 __u32 h_i_author;
324 } hurd2;
325 struct {
326 __u8 m_i_frag; /* Fragment number */
327 __u8 m_i_fsize; /* Fragment size */
328 __le16 m_i_file_acl_high;
329 __u32 m_i_reserved2[2];
330 } masix2;
331 } osd2; /* OS dependent 2 */
332 __le16 i_extra_isize;
333 __le16 i_pad1;
334 };
335
336 #define i_size_high i_dir_acl
337
338 #if defined(__KERNEL__) || defined(__linux__)
339 #define i_reserved1 osd1.linux1.l_i_reserved1
340 #define i_frag osd2.linux2.l_i_frag
341 #define i_fsize osd2.linux2.l_i_fsize
342 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
343 #define i_uid_low i_uid
344 #define i_gid_low i_gid
345 #define i_uid_high osd2.linux2.l_i_uid_high
346 #define i_gid_high osd2.linux2.l_i_gid_high
347 #define i_reserved2 osd2.linux2.l_i_reserved2
348
349 #elif defined(__GNU__)
350
351 #define i_translator osd1.hurd1.h_i_translator
352 #define i_frag osd2.hurd2.h_i_frag;
353 #define i_fsize osd2.hurd2.h_i_fsize;
354 #define i_uid_high osd2.hurd2.h_i_uid_high
355 #define i_gid_high osd2.hurd2.h_i_gid_high
356 #define i_author osd2.hurd2.h_i_author
357
358 #elif defined(__masix__)
359
360 #define i_reserved1 osd1.masix1.m_i_reserved1
361 #define i_frag osd2.masix2.m_i_frag
362 #define i_fsize osd2.masix2.m_i_fsize
363 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
364 #define i_reserved2 osd2.masix2.m_i_reserved2
365
366 #endif /* defined(__KERNEL__) || defined(__linux__) */
367
368 /*
369 * File system states
370 */
371 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
372 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
373 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
374
375 /*
376 * Mount flags
377 */
378 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
379 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
380 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
381 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
382 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
383 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
384 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
385 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
386 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
387 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
388 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
389 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
390 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
391 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
392 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
393 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
394 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
395 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
396 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
397 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
398 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
399 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
400 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
401 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
402 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
403
404 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
405 #ifndef _LINUX_EXT2_FS_H
406 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
407 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
408 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
409 EXT4_MOUNT_##opt)
410 #else
411 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
412 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
413 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
414 #endif
415
416 #define ext4_set_bit ext2_set_bit
417 #define ext4_set_bit_atomic ext2_set_bit_atomic
418 #define ext4_clear_bit ext2_clear_bit
419 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
420 #define ext4_test_bit ext2_test_bit
421 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
422 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
423
424 /*
425 * Maximal mount counts between two filesystem checks
426 */
427 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
428 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
429
430 /*
431 * Behaviour when detecting errors
432 */
433 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
434 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
435 #define EXT4_ERRORS_PANIC 3 /* Panic */
436 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
437
438 /*
439 * Structure of the super block
440 */
441 struct ext4_super_block {
442 /*00*/ __le32 s_inodes_count; /* Inodes count */
443 __le32 s_blocks_count; /* Blocks count */
444 __le32 s_r_blocks_count; /* Reserved blocks count */
445 __le32 s_free_blocks_count; /* Free blocks count */
446 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
447 __le32 s_first_data_block; /* First Data Block */
448 __le32 s_log_block_size; /* Block size */
449 __le32 s_log_frag_size; /* Fragment size */
450 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
451 __le32 s_frags_per_group; /* # Fragments per group */
452 __le32 s_inodes_per_group; /* # Inodes per group */
453 __le32 s_mtime; /* Mount time */
454 /*30*/ __le32 s_wtime; /* Write time */
455 __le16 s_mnt_count; /* Mount count */
456 __le16 s_max_mnt_count; /* Maximal mount count */
457 __le16 s_magic; /* Magic signature */
458 __le16 s_state; /* File system state */
459 __le16 s_errors; /* Behaviour when detecting errors */
460 __le16 s_minor_rev_level; /* minor revision level */
461 /*40*/ __le32 s_lastcheck; /* time of last check */
462 __le32 s_checkinterval; /* max. time between checks */
463 __le32 s_creator_os; /* OS */
464 __le32 s_rev_level; /* Revision level */
465 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
466 __le16 s_def_resgid; /* Default gid for reserved blocks */
467 /*
468 * These fields are for EXT4_DYNAMIC_REV superblocks only.
469 *
470 * Note: the difference between the compatible feature set and
471 * the incompatible feature set is that if there is a bit set
472 * in the incompatible feature set that the kernel doesn't
473 * know about, it should refuse to mount the filesystem.
474 *
475 * e2fsck's requirements are more strict; if it doesn't know
476 * about a feature in either the compatible or incompatible
477 * feature set, it must abort and not try to meddle with
478 * things it doesn't understand...
479 */
480 __le32 s_first_ino; /* First non-reserved inode */
481 __le16 s_inode_size; /* size of inode structure */
482 __le16 s_block_group_nr; /* block group # of this superblock */
483 __le32 s_feature_compat; /* compatible feature set */
484 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
485 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
486 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
487 /*78*/ char s_volume_name[16]; /* volume name */
488 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
489 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
490 /*
491 * Performance hints. Directory preallocation should only
492 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
493 */
494 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
495 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
496 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
497 /*
498 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
499 */
500 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
501 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
502 __le32 s_journal_dev; /* device number of journal file */
503 __le32 s_last_orphan; /* start of list of inodes to delete */
504 __le32 s_hash_seed[4]; /* HTREE hash seed */
505 __u8 s_def_hash_version; /* Default hash version to use */
506 __u8 s_reserved_char_pad;
507 __le16 s_desc_size; /* size of group descriptor */
508 /*100*/ __le32 s_default_mount_opts;
509 __le32 s_first_meta_bg; /* First metablock block group */
510 __le32 s_mkfs_time; /* When the filesystem was created */
511 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
512 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
513 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
514 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
515 __le32 s_free_blocks_count_hi; /* Free blocks count */
516 __u32 s_reserved[169]; /* Padding to the end of the block */
517 };
518
519 #ifdef __KERNEL__
520 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
521 {
522 return sb->s_fs_info;
523 }
524 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
525 {
526 return container_of(inode, struct ext4_inode_info, vfs_inode);
527 }
528
529 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
530 {
531 return ino == EXT4_ROOT_INO ||
532 ino == EXT4_JOURNAL_INO ||
533 ino == EXT4_RESIZE_INO ||
534 (ino >= EXT4_FIRST_INO(sb) &&
535 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
536 }
537 #else
538 /* Assume that user mode programs are passing in an ext4fs superblock, not
539 * a kernel struct super_block. This will allow us to call the feature-test
540 * macros from user land. */
541 #define EXT4_SB(sb) (sb)
542 #endif
543
544 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
545
546 /*
547 * Codes for operating systems
548 */
549 #define EXT4_OS_LINUX 0
550 #define EXT4_OS_HURD 1
551 #define EXT4_OS_MASIX 2
552 #define EXT4_OS_FREEBSD 3
553 #define EXT4_OS_LITES 4
554
555 /*
556 * Revision levels
557 */
558 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
559 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
560
561 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
562 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
563
564 #define EXT4_GOOD_OLD_INODE_SIZE 128
565
566 /*
567 * Feature set definitions
568 */
569
570 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
571 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
572 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
573 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
574 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
575 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
576 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
577 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
578 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
579 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
580 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
581 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
582 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
583 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
584 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
585 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
586 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
587 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
588
589 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
590 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
591 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
592 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
593 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
594 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
595
596 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
597 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
598 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
599
600 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
601 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
602 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
603 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
604 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
605 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
606 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
607
608 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
609 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
610 EXT4_FEATURE_INCOMPAT_RECOVER| \
611 EXT4_FEATURE_INCOMPAT_META_BG| \
612 EXT4_FEATURE_INCOMPAT_EXTENTS| \
613 EXT4_FEATURE_INCOMPAT_64BIT)
614 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
615 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
616 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
617
618 /*
619 * Default values for user and/or group using reserved blocks
620 */
621 #define EXT4_DEF_RESUID 0
622 #define EXT4_DEF_RESGID 0
623
624 /*
625 * Default mount options
626 */
627 #define EXT4_DEFM_DEBUG 0x0001
628 #define EXT4_DEFM_BSDGROUPS 0x0002
629 #define EXT4_DEFM_XATTR_USER 0x0004
630 #define EXT4_DEFM_ACL 0x0008
631 #define EXT4_DEFM_UID16 0x0010
632 #define EXT4_DEFM_JMODE 0x0060
633 #define EXT4_DEFM_JMODE_DATA 0x0020
634 #define EXT4_DEFM_JMODE_ORDERED 0x0040
635 #define EXT4_DEFM_JMODE_WBACK 0x0060
636
637 /*
638 * Structure of a directory entry
639 */
640 #define EXT4_NAME_LEN 255
641
642 struct ext4_dir_entry {
643 __le32 inode; /* Inode number */
644 __le16 rec_len; /* Directory entry length */
645 __le16 name_len; /* Name length */
646 char name[EXT4_NAME_LEN]; /* File name */
647 };
648
649 /*
650 * The new version of the directory entry. Since EXT4 structures are
651 * stored in intel byte order, and the name_len field could never be
652 * bigger than 255 chars, it's safe to reclaim the extra byte for the
653 * file_type field.
654 */
655 struct ext4_dir_entry_2 {
656 __le32 inode; /* Inode number */
657 __le16 rec_len; /* Directory entry length */
658 __u8 name_len; /* Name length */
659 __u8 file_type;
660 char name[EXT4_NAME_LEN]; /* File name */
661 };
662
663 /*
664 * Ext4 directory file types. Only the low 3 bits are used. The
665 * other bits are reserved for now.
666 */
667 #define EXT4_FT_UNKNOWN 0
668 #define EXT4_FT_REG_FILE 1
669 #define EXT4_FT_DIR 2
670 #define EXT4_FT_CHRDEV 3
671 #define EXT4_FT_BLKDEV 4
672 #define EXT4_FT_FIFO 5
673 #define EXT4_FT_SOCK 6
674 #define EXT4_FT_SYMLINK 7
675
676 #define EXT4_FT_MAX 8
677
678 /*
679 * EXT4_DIR_PAD defines the directory entries boundaries
680 *
681 * NOTE: It must be a multiple of 4
682 */
683 #define EXT4_DIR_PAD 4
684 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
685 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
686 ~EXT4_DIR_ROUND)
687 /*
688 * Hash Tree Directory indexing
689 * (c) Daniel Phillips, 2001
690 */
691
692 #ifdef CONFIG_EXT4_INDEX
693 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
694 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
695 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
696 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
697 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
698 #else
699 #define is_dx(dir) 0
700 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
701 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
702 #endif
703
704 /* Legal values for the dx_root hash_version field: */
705
706 #define DX_HASH_LEGACY 0
707 #define DX_HASH_HALF_MD4 1
708 #define DX_HASH_TEA 2
709
710 #ifdef __KERNEL__
711
712 /* hash info structure used by the directory hash */
713 struct dx_hash_info
714 {
715 u32 hash;
716 u32 minor_hash;
717 int hash_version;
718 u32 *seed;
719 };
720
721 #define EXT4_HTREE_EOF 0x7fffffff
722
723 /*
724 * Control parameters used by ext4_htree_next_block
725 */
726 #define HASH_NB_ALWAYS 1
727
728
729 /*
730 * Describe an inode's exact location on disk and in memory
731 */
732 struct ext4_iloc
733 {
734 struct buffer_head *bh;
735 unsigned long offset;
736 unsigned long block_group;
737 };
738
739 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
740 {
741 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
742 }
743
744 /*
745 * This structure is stuffed into the struct file's private_data field
746 * for directories. It is where we put information so that we can do
747 * readdir operations in hash tree order.
748 */
749 struct dir_private_info {
750 struct rb_root root;
751 struct rb_node *curr_node;
752 struct fname *extra_fname;
753 loff_t last_pos;
754 __u32 curr_hash;
755 __u32 curr_minor_hash;
756 __u32 next_hash;
757 };
758
759 /* calculate the first block number of the group */
760 static inline ext4_fsblk_t
761 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
762 {
763 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
764 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
765 }
766
767 /*
768 * Special error return code only used by dx_probe() and its callers.
769 */
770 #define ERR_BAD_DX_DIR -75000
771
772 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
773 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
774
775 /*
776 * Function prototypes
777 */
778
779 /*
780 * Ok, these declarations are also in <linux/kernel.h> but none of the
781 * ext4 source programs needs to include it so they are duplicated here.
782 */
783 # define NORET_TYPE /**/
784 # define ATTRIB_NORET __attribute__((noreturn))
785 # define NORET_AND noreturn,
786
787 /* balloc.c */
788 extern unsigned int ext4_block_group(struct super_block *sb,
789 ext4_fsblk_t blocknr);
790 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
791 ext4_fsblk_t blocknr);
792 extern int ext4_bg_has_super(struct super_block *sb, int group);
793 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
794 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
795 ext4_fsblk_t goal, int *errp);
796 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
797 ext4_fsblk_t goal, unsigned long *count, int *errp);
798 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
799 ext4_fsblk_t block, unsigned long count);
800 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
801 ext4_fsblk_t block, unsigned long count,
802 unsigned long *pdquot_freed_blocks);
803 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
804 extern void ext4_check_blocks_bitmap (struct super_block *);
805 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
806 unsigned int block_group,
807 struct buffer_head ** bh);
808 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
809 extern void ext4_init_block_alloc_info(struct inode *);
810 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
811
812 /* dir.c */
813 extern int ext4_check_dir_entry(const char *, struct inode *,
814 struct ext4_dir_entry_2 *,
815 struct buffer_head *, unsigned long);
816 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
817 __u32 minor_hash,
818 struct ext4_dir_entry_2 *dirent);
819 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
820
821 /* fsync.c */
822 extern int ext4_sync_file (struct file *, struct dentry *, int);
823
824 /* hash.c */
825 extern int ext4fs_dirhash(const char *name, int len, struct
826 dx_hash_info *hinfo);
827
828 /* ialloc.c */
829 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
830 extern void ext4_free_inode (handle_t *, struct inode *);
831 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
832 extern unsigned long ext4_count_free_inodes (struct super_block *);
833 extern unsigned long ext4_count_dirs (struct super_block *);
834 extern void ext4_check_inodes_bitmap (struct super_block *);
835 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
836
837
838 /* inode.c */
839 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
840 struct buffer_head *bh, ext4_fsblk_t blocknr);
841 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
842 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
843 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
844 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
845 int create, int extend_disksize);
846
847 extern void ext4_read_inode (struct inode *);
848 extern int ext4_write_inode (struct inode *, int);
849 extern int ext4_setattr (struct dentry *, struct iattr *);
850 extern void ext4_delete_inode (struct inode *);
851 extern int ext4_sync_inode (handle_t *, struct inode *);
852 extern void ext4_discard_reservation (struct inode *);
853 extern void ext4_dirty_inode(struct inode *);
854 extern int ext4_change_inode_journal_flag(struct inode *, int);
855 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
856 extern void ext4_truncate (struct inode *);
857 extern void ext4_set_inode_flags(struct inode *);
858 extern void ext4_set_aops(struct inode *inode);
859 extern int ext4_writepage_trans_blocks(struct inode *);
860 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
861 struct address_space *mapping, loff_t from);
862
863 /* ioctl.c */
864 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
865 unsigned long);
866 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
867
868 /* namei.c */
869 extern int ext4_orphan_add(handle_t *, struct inode *);
870 extern int ext4_orphan_del(handle_t *, struct inode *);
871 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
872 __u32 start_minor_hash, __u32 *next_hash);
873
874 /* resize.c */
875 extern int ext4_group_add(struct super_block *sb,
876 struct ext4_new_group_data *input);
877 extern int ext4_group_extend(struct super_block *sb,
878 struct ext4_super_block *es,
879 ext4_fsblk_t n_blocks_count);
880
881 /* super.c */
882 extern void ext4_error (struct super_block *, const char *, const char *, ...)
883 __attribute__ ((format (printf, 3, 4)));
884 extern void __ext4_std_error (struct super_block *, const char *, int);
885 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
886 __attribute__ ((format (printf, 3, 4)));
887 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
888 __attribute__ ((format (printf, 3, 4)));
889 extern void ext4_update_dynamic_rev (struct super_block *sb);
890 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
891 struct ext4_group_desc *bg);
892 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
893 struct ext4_group_desc *bg);
894 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
895 struct ext4_group_desc *bg);
896 extern void ext4_block_bitmap_set(struct super_block *sb,
897 struct ext4_group_desc *bg, ext4_fsblk_t blk);
898 extern void ext4_inode_bitmap_set(struct super_block *sb,
899 struct ext4_group_desc *bg, ext4_fsblk_t blk);
900 extern void ext4_inode_table_set(struct super_block *sb,
901 struct ext4_group_desc *bg, ext4_fsblk_t blk);
902
903 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
904 {
905 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
906 le32_to_cpu(es->s_blocks_count);
907 }
908
909 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
910 {
911 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
912 le32_to_cpu(es->s_r_blocks_count);
913 }
914
915 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
916 {
917 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
918 le32_to_cpu(es->s_free_blocks_count);
919 }
920
921 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
922 ext4_fsblk_t blk)
923 {
924 es->s_blocks_count = cpu_to_le32((u32)blk);
925 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
926 }
927
928 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
929 ext4_fsblk_t blk)
930 {
931 es->s_free_blocks_count = cpu_to_le32((u32)blk);
932 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
933 }
934
935 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
936 ext4_fsblk_t blk)
937 {
938 es->s_r_blocks_count = cpu_to_le32((u32)blk);
939 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
940 }
941
942
943
944 #define ext4_std_error(sb, errno) \
945 do { \
946 if ((errno)) \
947 __ext4_std_error((sb), __FUNCTION__, (errno)); \
948 } while (0)
949
950 /*
951 * Inodes and files operations
952 */
953
954 /* dir.c */
955 extern const struct file_operations ext4_dir_operations;
956
957 /* file.c */
958 extern struct inode_operations ext4_file_inode_operations;
959 extern const struct file_operations ext4_file_operations;
960
961 /* namei.c */
962 extern struct inode_operations ext4_dir_inode_operations;
963 extern struct inode_operations ext4_special_inode_operations;
964
965 /* symlink.c */
966 extern struct inode_operations ext4_symlink_inode_operations;
967 extern struct inode_operations ext4_fast_symlink_inode_operations;
968
969 /* extents.c */
970 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
971 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
972 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
973 ext4_fsblk_t iblock,
974 unsigned long max_blocks, struct buffer_head *bh_result,
975 int create, int extend_disksize);
976 extern void ext4_ext_truncate(struct inode *, struct page *);
977 extern void ext4_ext_init(struct super_block *);
978 extern void ext4_ext_release(struct super_block *);
979 static inline int
980 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
981 unsigned long max_blocks, struct buffer_head *bh,
982 int create, int extend_disksize)
983 {
984 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
985 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
986 bh, create, extend_disksize);
987 return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
988 create, extend_disksize);
989 }
990
991
992 #endif /* __KERNEL__ */
993
994 #endif /* _LINUX_EXT4_FS_H */
linux kernel for loongson