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i2c: use bcd2bin/bin2bcd
[linux-2.6/sactl.git] / fs / ext4 / ext4.h
blob4880cc3e672778d54944326d265fa9b50b8d7275
1 /*
2 * ext4.h
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
16 #ifndef _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include "ext4_i.h"
23
24 /*
25 * The fourth extended filesystem constants/structures
26 */
27
28 /*
29 * Define EXT4FS_DEBUG to produce debug messages
30 */
31 #undef EXT4FS_DEBUG
32
33 /*
34 * Define EXT4_RESERVATION to reserve data blocks for expanding files
35 */
36 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
37 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
38 #define EXT4_MAX_RESERVE_BLOCKS 1027
39 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
40
41 /*
42 * Debug code
43 */
44 #ifdef EXT4FS_DEBUG
45 #define ext4_debug(f, a...) \
46 do { \
47 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
48 __FILE__, __LINE__, __func__); \
49 printk(KERN_DEBUG f, ## a); \
50 } while (0)
51 #else
52 #define ext4_debug(f, a...) do {} while (0)
53 #endif
54
55 #define EXT4_MULTIBLOCK_ALLOCATOR 1
56
57 /* prefer goal again. length */
58 #define EXT4_MB_HINT_MERGE 1
59 /* blocks already reserved */
60 #define EXT4_MB_HINT_RESERVED 2
61 /* metadata is being allocated */
62 #define EXT4_MB_HINT_METADATA 4
63 /* first blocks in the file */
64 #define EXT4_MB_HINT_FIRST 8
65 /* search for the best chunk */
66 #define EXT4_MB_HINT_BEST 16
67 /* data is being allocated */
68 #define EXT4_MB_HINT_DATA 32
69 /* don't preallocate (for tails) */
70 #define EXT4_MB_HINT_NOPREALLOC 64
71 /* allocate for locality group */
72 #define EXT4_MB_HINT_GROUP_ALLOC 128
73 /* allocate goal blocks or none */
74 #define EXT4_MB_HINT_GOAL_ONLY 256
75 /* goal is meaningful */
76 #define EXT4_MB_HINT_TRY_GOAL 512
77 /* blocks already pre-reserved by delayed allocation */
78 #define EXT4_MB_DELALLOC_RESERVED 1024
79
80
81 struct ext4_allocation_request {
82 /* target inode for block we're allocating */
83 struct inode *inode;
84 /* logical block in target inode */
85 ext4_lblk_t logical;
86 /* phys. target (a hint) */
87 ext4_fsblk_t goal;
88 /* the closest logical allocated block to the left */
89 ext4_lblk_t lleft;
90 /* phys. block for ^^^ */
91 ext4_fsblk_t pleft;
92 /* the closest logical allocated block to the right */
93 ext4_lblk_t lright;
94 /* phys. block for ^^^ */
95 ext4_fsblk_t pright;
96 /* how many blocks we want to allocate */
97 unsigned long len;
98 /* flags. see above EXT4_MB_HINT_* */
99 unsigned long flags;
100 };
101
102 /*
103 * Special inodes numbers
104 */
105 #define EXT4_BAD_INO 1 /* Bad blocks inode */
106 #define EXT4_ROOT_INO 2 /* Root inode */
107 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
108 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
109 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
110 #define EXT4_JOURNAL_INO 8 /* Journal inode */
111
112 /* First non-reserved inode for old ext4 filesystems */
113 #define EXT4_GOOD_OLD_FIRST_INO 11
114
115 /*
116 * Maximal count of links to a file
117 */
118 #define EXT4_LINK_MAX 65000
119
120 /*
121 * Macro-instructions used to manage several block sizes
122 */
123 #define EXT4_MIN_BLOCK_SIZE 1024
124 #define EXT4_MAX_BLOCK_SIZE 65536
125 #define EXT4_MIN_BLOCK_LOG_SIZE 10
126 #ifdef __KERNEL__
127 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
128 #else
129 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
130 #endif
131 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
132 #ifdef __KERNEL__
133 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
134 #else
135 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
136 #endif
137 #ifdef __KERNEL__
138 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
139 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
140 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
141 #else
142 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
143 EXT4_GOOD_OLD_INODE_SIZE : \
144 (s)->s_inode_size)
145 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
146 EXT4_GOOD_OLD_FIRST_INO : \
147 (s)->s_first_ino)
148 #endif
149 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
150
151 /*
152 * Structure of a blocks group descriptor
153 */
154 struct ext4_group_desc
155 {
156 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
157 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
158 __le32 bg_inode_table_lo; /* Inodes table block */
159 __le16 bg_free_blocks_count; /* Free blocks count */
160 __le16 bg_free_inodes_count; /* Free inodes count */
161 __le16 bg_used_dirs_count; /* Directories count */
162 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
163 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
164 __le16 bg_itable_unused; /* Unused inodes count */
165 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
166 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
167 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
168 __le32 bg_inode_table_hi; /* Inodes table block MSB */
169 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
170 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
171 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
172 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
173 __u32 bg_reserved2[3];
174 };
175
176 /*
177 * Structure of a flex block group info
178 */
179
180 struct flex_groups {
181 __u32 free_inodes;
182 __u32 free_blocks;
183 };
184
185 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
186 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
187 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
188
189 #ifdef __KERNEL__
190 #include "ext4_sb.h"
191 #endif
192 /*
193 * Macro-instructions used to manage group descriptors
194 */
195 #define EXT4_MIN_DESC_SIZE 32
196 #define EXT4_MIN_DESC_SIZE_64BIT 64
197 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
198 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
199 #ifdef __KERNEL__
200 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
201 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
202 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
203 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
204 #else
205 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
206 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
207 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
208 #endif
209
210 /*
211 * Constants relative to the data blocks
212 */
213 #define EXT4_NDIR_BLOCKS 12
214 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
215 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
216 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
217 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
218
219 /*
220 * Inode flags
221 */
222 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
223 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
224 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
225 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
226 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
227 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
228 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
229 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
230 /* Reserved for compression usage... */
231 #define EXT4_DIRTY_FL 0x00000100
232 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
233 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
234 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
235 /* End compression flags --- maybe not all used */
236 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
237 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
238 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
239 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
240 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
241 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
242 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
243 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
244 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
245 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
246
247 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
248 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
249
250 /*
251 * Inode dynamic state flags
252 */
253 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
254 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
255 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
256 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
257
258 /* Used to pass group descriptor data when online resize is done */
259 struct ext4_new_group_input {
260 __u32 group; /* Group number for this data */
261 __u64 block_bitmap; /* Absolute block number of block bitmap */
262 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
263 __u64 inode_table; /* Absolute block number of inode table start */
264 __u32 blocks_count; /* Total number of blocks in this group */
265 __u16 reserved_blocks; /* Number of reserved blocks in this group */
266 __u16 unused;
267 };
268
269 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
270 struct ext4_new_group_data {
271 __u32 group;
272 __u64 block_bitmap;
273 __u64 inode_bitmap;
274 __u64 inode_table;
275 __u32 blocks_count;
276 __u16 reserved_blocks;
277 __u16 unused;
278 __u32 free_blocks_count;
279 };
280
281 /*
282 * Following is used by preallocation code to tell get_blocks() that we
283 * want uninitialzed extents.
284 */
285 #define EXT4_CREATE_UNINITIALIZED_EXT 2
286
287 /*
288 * ioctl commands
289 */
290 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
291 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
292 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
293 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
294 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
295 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
296 #ifdef CONFIG_JBD2_DEBUG
297 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
298 #endif
299 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
300 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
301 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
302 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
303 #define EXT4_IOC_MIGRATE _IO('f', 9)
304 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
305
306 /*
307 * ioctl commands in 32 bit emulation
308 */
309 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
310 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
311 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
312 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
313 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
314 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
315 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
316 #ifdef CONFIG_JBD2_DEBUG
317 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
318 #endif
319 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
320 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
321
322
323 /*
324 * Mount options
325 */
326 struct ext4_mount_options {
327 unsigned long s_mount_opt;
328 uid_t s_resuid;
329 gid_t s_resgid;
330 unsigned long s_commit_interval;
331 #ifdef CONFIG_QUOTA
332 int s_jquota_fmt;
333 char *s_qf_names[MAXQUOTAS];
334 #endif
335 };
336
337 /*
338 * Structure of an inode on the disk
339 */
340 struct ext4_inode {
341 __le16 i_mode; /* File mode */
342 __le16 i_uid; /* Low 16 bits of Owner Uid */
343 __le32 i_size_lo; /* Size in bytes */
344 __le32 i_atime; /* Access time */
345 __le32 i_ctime; /* Inode Change time */
346 __le32 i_mtime; /* Modification time */
347 __le32 i_dtime; /* Deletion Time */
348 __le16 i_gid; /* Low 16 bits of Group Id */
349 __le16 i_links_count; /* Links count */
350 __le32 i_blocks_lo; /* Blocks count */
351 __le32 i_flags; /* File flags */
352 union {
353 struct {
354 __le32 l_i_version;
355 } linux1;
356 struct {
357 __u32 h_i_translator;
358 } hurd1;
359 struct {
360 __u32 m_i_reserved1;
361 } masix1;
362 } osd1; /* OS dependent 1 */
363 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
364 __le32 i_generation; /* File version (for NFS) */
365 __le32 i_file_acl_lo; /* File ACL */
366 __le32 i_size_high;
367 __le32 i_obso_faddr; /* Obsoleted fragment address */
368 union {
369 struct {
370 __le16 l_i_blocks_high; /* were l_i_reserved1 */
371 __le16 l_i_file_acl_high;
372 __le16 l_i_uid_high; /* these 2 fields */
373 __le16 l_i_gid_high; /* were reserved2[0] */
374 __u32 l_i_reserved2;
375 } linux2;
376 struct {
377 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
378 __u16 h_i_mode_high;
379 __u16 h_i_uid_high;
380 __u16 h_i_gid_high;
381 __u32 h_i_author;
382 } hurd2;
383 struct {
384 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
385 __le16 m_i_file_acl_high;
386 __u32 m_i_reserved2[2];
387 } masix2;
388 } osd2; /* OS dependent 2 */
389 __le16 i_extra_isize;
390 __le16 i_pad1;
391 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
392 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
393 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
394 __le32 i_crtime; /* File Creation time */
395 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
396 __le32 i_version_hi; /* high 32 bits for 64-bit version */
397 };
398
399
400 #define EXT4_EPOCH_BITS 2
401 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
402 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
403
404 /*
405 * Extended fields will fit into an inode if the filesystem was formatted
406 * with large inodes (-I 256 or larger) and there are not currently any EAs
407 * consuming all of the available space. For new inodes we always reserve
408 * enough space for the kernel's known extended fields, but for inodes
409 * created with an old kernel this might not have been the case. None of
410 * the extended inode fields is critical for correct filesystem operation.
411 * This macro checks if a certain field fits in the inode. Note that
412 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
413 */
414 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
415 ((offsetof(typeof(*ext4_inode), field) + \
416 sizeof((ext4_inode)->field)) \
417 <= (EXT4_GOOD_OLD_INODE_SIZE + \
418 (einode)->i_extra_isize)) \
419
420 static inline __le32 ext4_encode_extra_time(struct timespec *time)
421 {
422 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
423 time->tv_sec >> 32 : 0) |
424 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
425 }
426
427 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
428 {
429 if (sizeof(time->tv_sec) > 4)
430 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
431 << 32;
432 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
433 }
434
435 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
436 do { \
437 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
438 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
439 (raw_inode)->xtime ## _extra = \
440 ext4_encode_extra_time(&(inode)->xtime); \
441 } while (0)
442
443 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
444 do { \
445 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
446 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
447 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
448 (raw_inode)->xtime ## _extra = \
449 ext4_encode_extra_time(&(einode)->xtime); \
450 } while (0)
451
452 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
453 do { \
454 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
455 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
456 ext4_decode_extra_time(&(inode)->xtime, \
457 raw_inode->xtime ## _extra); \
458 } while (0)
459
460 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
461 do { \
462 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
463 (einode)->xtime.tv_sec = \
464 (signed)le32_to_cpu((raw_inode)->xtime); \
465 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
466 ext4_decode_extra_time(&(einode)->xtime, \
467 raw_inode->xtime ## _extra); \
468 } while (0)
469
470 #define i_disk_version osd1.linux1.l_i_version
471
472 #if defined(__KERNEL__) || defined(__linux__)
473 #define i_reserved1 osd1.linux1.l_i_reserved1
474 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
475 #define i_blocks_high osd2.linux2.l_i_blocks_high
476 #define i_uid_low i_uid
477 #define i_gid_low i_gid
478 #define i_uid_high osd2.linux2.l_i_uid_high
479 #define i_gid_high osd2.linux2.l_i_gid_high
480 #define i_reserved2 osd2.linux2.l_i_reserved2
481
482 #elif defined(__GNU__)
483
484 #define i_translator osd1.hurd1.h_i_translator
485 #define i_uid_high osd2.hurd2.h_i_uid_high
486 #define i_gid_high osd2.hurd2.h_i_gid_high
487 #define i_author osd2.hurd2.h_i_author
488
489 #elif defined(__masix__)
490
491 #define i_reserved1 osd1.masix1.m_i_reserved1
492 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
493 #define i_reserved2 osd2.masix2.m_i_reserved2
494
495 #endif /* defined(__KERNEL__) || defined(__linux__) */
496
497 /*
498 * File system states
499 */
500 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
501 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
502 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
503
504 /*
505 * Misc. filesystem flags
506 */
507 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
508 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
509 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
510
511 /*
512 * Mount flags
513 */
514 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
515 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
516 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
517 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
518 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
519 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
520 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
521 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
522 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
523 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
524 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
525 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
526 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
527 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
528 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
529 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
530 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
531 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
532 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
533 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
534 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
535 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
536 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
537 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
538 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
539 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
540 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
541 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
542 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
543
544 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
545 #ifndef _LINUX_EXT2_FS_H
546 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
547 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
548 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
549 EXT4_MOUNT_##opt)
550 #else
551 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
552 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
553 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
554 #endif
555
556 #define ext4_set_bit ext2_set_bit
557 #define ext4_set_bit_atomic ext2_set_bit_atomic
558 #define ext4_clear_bit ext2_clear_bit
559 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
560 #define ext4_test_bit ext2_test_bit
561 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
562 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
563 #define ext4_find_next_bit ext2_find_next_bit
564
565 /*
566 * Maximal mount counts between two filesystem checks
567 */
568 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
569 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
570
571 /*
572 * Behaviour when detecting errors
573 */
574 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
575 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
576 #define EXT4_ERRORS_PANIC 3 /* Panic */
577 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
578
579 /*
580 * Structure of the super block
581 */
582 struct ext4_super_block {
583 /*00*/ __le32 s_inodes_count; /* Inodes count */
584 __le32 s_blocks_count_lo; /* Blocks count */
585 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
586 __le32 s_free_blocks_count_lo; /* Free blocks count */
587 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
588 __le32 s_first_data_block; /* First Data Block */
589 __le32 s_log_block_size; /* Block size */
590 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
591 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
592 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
593 __le32 s_inodes_per_group; /* # Inodes per group */
594 __le32 s_mtime; /* Mount time */
595 /*30*/ __le32 s_wtime; /* Write time */
596 __le16 s_mnt_count; /* Mount count */
597 __le16 s_max_mnt_count; /* Maximal mount count */
598 __le16 s_magic; /* Magic signature */
599 __le16 s_state; /* File system state */
600 __le16 s_errors; /* Behaviour when detecting errors */
601 __le16 s_minor_rev_level; /* minor revision level */
602 /*40*/ __le32 s_lastcheck; /* time of last check */
603 __le32 s_checkinterval; /* max. time between checks */
604 __le32 s_creator_os; /* OS */
605 __le32 s_rev_level; /* Revision level */
606 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
607 __le16 s_def_resgid; /* Default gid for reserved blocks */
608 /*
609 * These fields are for EXT4_DYNAMIC_REV superblocks only.
610 *
611 * Note: the difference between the compatible feature set and
612 * the incompatible feature set is that if there is a bit set
613 * in the incompatible feature set that the kernel doesn't
614 * know about, it should refuse to mount the filesystem.
615 *
616 * e2fsck's requirements are more strict; if it doesn't know
617 * about a feature in either the compatible or incompatible
618 * feature set, it must abort and not try to meddle with
619 * things it doesn't understand...
620 */
621 __le32 s_first_ino; /* First non-reserved inode */
622 __le16 s_inode_size; /* size of inode structure */
623 __le16 s_block_group_nr; /* block group # of this superblock */
624 __le32 s_feature_compat; /* compatible feature set */
625 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
626 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
627 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
628 /*78*/ char s_volume_name[16]; /* volume name */
629 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
630 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
631 /*
632 * Performance hints. Directory preallocation should only
633 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
634 */
635 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
636 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
637 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
638 /*
639 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
640 */
641 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
642 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
643 __le32 s_journal_dev; /* device number of journal file */
644 __le32 s_last_orphan; /* start of list of inodes to delete */
645 __le32 s_hash_seed[4]; /* HTREE hash seed */
646 __u8 s_def_hash_version; /* Default hash version to use */
647 __u8 s_reserved_char_pad;
648 __le16 s_desc_size; /* size of group descriptor */
649 /*100*/ __le32 s_default_mount_opts;
650 __le32 s_first_meta_bg; /* First metablock block group */
651 __le32 s_mkfs_time; /* When the filesystem was created */
652 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
653 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
654 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
655 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
656 __le32 s_free_blocks_count_hi; /* Free blocks count */
657 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
658 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
659 __le32 s_flags; /* Miscellaneous flags */
660 __le16 s_raid_stride; /* RAID stride */
661 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
662 __le64 s_mmp_block; /* Block for multi-mount protection */
663 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
664 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
665 __u8 s_reserved_char_pad2;
666 __le16 s_reserved_pad;
667 __u32 s_reserved[162]; /* Padding to the end of the block */
668 };
669
670 #ifdef __KERNEL__
671 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
672 {
673 return sb->s_fs_info;
674 }
675 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
676 {
677 return container_of(inode, struct ext4_inode_info, vfs_inode);
678 }
679
680 static inline struct timespec ext4_current_time(struct inode *inode)
681 {
682 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
683 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
684 }
685
686
687 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
688 {
689 return ino == EXT4_ROOT_INO ||
690 ino == EXT4_JOURNAL_INO ||
691 ino == EXT4_RESIZE_INO ||
692 (ino >= EXT4_FIRST_INO(sb) &&
693 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
694 }
695 #else
696 /* Assume that user mode programs are passing in an ext4fs superblock, not
697 * a kernel struct super_block. This will allow us to call the feature-test
698 * macros from user land. */
699 #define EXT4_SB(sb) (sb)
700 #endif
701
702 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
703
704 /*
705 * Codes for operating systems
706 */
707 #define EXT4_OS_LINUX 0
708 #define EXT4_OS_HURD 1
709 #define EXT4_OS_MASIX 2
710 #define EXT4_OS_FREEBSD 3
711 #define EXT4_OS_LITES 4
712
713 /*
714 * Revision levels
715 */
716 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
717 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
718
719 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
720 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
721
722 #define EXT4_GOOD_OLD_INODE_SIZE 128
723
724 /*
725 * Feature set definitions
726 */
727
728 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
729 (EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask))
730 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
731 (EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask))
732 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
733 (EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask))
734 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
735 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
736 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
737 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
738 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
739 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
740 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
741 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
742 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
743 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
744 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
745 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
746
747 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
748 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
749 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
750 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
751 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
752 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
753
754 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
755 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
756 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
757 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
758 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
759 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
760 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
761
762 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
763 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
764 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
765 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
766 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
767 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
768 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
769 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
770 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
771
772 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
773 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
774 EXT4_FEATURE_INCOMPAT_RECOVER| \
775 EXT4_FEATURE_INCOMPAT_META_BG| \
776 EXT4_FEATURE_INCOMPAT_EXTENTS| \
777 EXT4_FEATURE_INCOMPAT_64BIT| \
778 EXT4_FEATURE_INCOMPAT_FLEX_BG)
779 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
780 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
781 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
782 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
783 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
784 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
785 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
786
787 /*
788 * Default values for user and/or group using reserved blocks
789 */
790 #define EXT4_DEF_RESUID 0
791 #define EXT4_DEF_RESGID 0
792
793 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
794
795 /*
796 * Default mount options
797 */
798 #define EXT4_DEFM_DEBUG 0x0001
799 #define EXT4_DEFM_BSDGROUPS 0x0002
800 #define EXT4_DEFM_XATTR_USER 0x0004
801 #define EXT4_DEFM_ACL 0x0008
802 #define EXT4_DEFM_UID16 0x0010
803 #define EXT4_DEFM_JMODE 0x0060
804 #define EXT4_DEFM_JMODE_DATA 0x0020
805 #define EXT4_DEFM_JMODE_ORDERED 0x0040
806 #define EXT4_DEFM_JMODE_WBACK 0x0060
807
808 /*
809 * Structure of a directory entry
810 */
811 #define EXT4_NAME_LEN 255
812
813 struct ext4_dir_entry {
814 __le32 inode; /* Inode number */
815 __le16 rec_len; /* Directory entry length */
816 __le16 name_len; /* Name length */
817 char name[EXT4_NAME_LEN]; /* File name */
818 };
819
820 /*
821 * The new version of the directory entry. Since EXT4 structures are
822 * stored in intel byte order, and the name_len field could never be
823 * bigger than 255 chars, it's safe to reclaim the extra byte for the
824 * file_type field.
825 */
826 struct ext4_dir_entry_2 {
827 __le32 inode; /* Inode number */
828 __le16 rec_len; /* Directory entry length */
829 __u8 name_len; /* Name length */
830 __u8 file_type;
831 char name[EXT4_NAME_LEN]; /* File name */
832 };
833
834 /*
835 * Ext4 directory file types. Only the low 3 bits are used. The
836 * other bits are reserved for now.
837 */
838 #define EXT4_FT_UNKNOWN 0
839 #define EXT4_FT_REG_FILE 1
840 #define EXT4_FT_DIR 2
841 #define EXT4_FT_CHRDEV 3
842 #define EXT4_FT_BLKDEV 4
843 #define EXT4_FT_FIFO 5
844 #define EXT4_FT_SOCK 6
845 #define EXT4_FT_SYMLINK 7
846
847 #define EXT4_FT_MAX 8
848
849 /*
850 * EXT4_DIR_PAD defines the directory entries boundaries
851 *
852 * NOTE: It must be a multiple of 4
853 */
854 #define EXT4_DIR_PAD 4
855 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
856 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
857 ~EXT4_DIR_ROUND)
858 #define EXT4_MAX_REC_LEN ((1<<16)-1)
859
860 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
861 {
862 unsigned len = le16_to_cpu(dlen);
863
864 if (len == EXT4_MAX_REC_LEN)
865 return 1 << 16;
866 return len;
867 }
868
869 static inline __le16 ext4_rec_len_to_disk(unsigned len)
870 {
871 if (len == (1 << 16))
872 return cpu_to_le16(EXT4_MAX_REC_LEN);
873 else if (len > (1 << 16))
874 BUG();
875 return cpu_to_le16(len);
876 }
877
878 /*
879 * Hash Tree Directory indexing
880 * (c) Daniel Phillips, 2001
881 */
882
883 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
884 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
885 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
886 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
887 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
888
889 /* Legal values for the dx_root hash_version field: */
890
891 #define DX_HASH_LEGACY 0
892 #define DX_HASH_HALF_MD4 1
893 #define DX_HASH_TEA 2
894
895 #ifdef __KERNEL__
896
897 /* hash info structure used by the directory hash */
898 struct dx_hash_info
899 {
900 u32 hash;
901 u32 minor_hash;
902 int hash_version;
903 u32 *seed;
904 };
905
906 #define EXT4_HTREE_EOF 0x7fffffff
907
908 /*
909 * Control parameters used by ext4_htree_next_block
910 */
911 #define HASH_NB_ALWAYS 1
912
913
914 /*
915 * Describe an inode's exact location on disk and in memory
916 */
917 struct ext4_iloc
918 {
919 struct buffer_head *bh;
920 unsigned long offset;
921 ext4_group_t block_group;
922 };
923
924 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
925 {
926 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
927 }
928
929 /*
930 * This structure is stuffed into the struct file's private_data field
931 * for directories. It is where we put information so that we can do
932 * readdir operations in hash tree order.
933 */
934 struct dir_private_info {
935 struct rb_root root;
936 struct rb_node *curr_node;
937 struct fname *extra_fname;
938 loff_t last_pos;
939 __u32 curr_hash;
940 __u32 curr_minor_hash;
941 __u32 next_hash;
942 };
943
944 /* calculate the first block number of the group */
945 static inline ext4_fsblk_t
946 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
947 {
948 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
949 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
950 }
951
952 /*
953 * Special error return code only used by dx_probe() and its callers.
954 */
955 #define ERR_BAD_DX_DIR -75000
956
957 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
958 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
959
960 extern struct proc_dir_entry *ext4_proc_root;
961
962 #ifdef CONFIG_PROC_FS
963 extern const struct file_operations ext4_ui_proc_fops;
964
965 #define EXT4_PROC_HANDLER(name, var) \
966 do { \
967 proc = proc_create_data(name, mode, sbi->s_proc, \
968 &ext4_ui_proc_fops, &sbi->s_##var); \
969 if (proc == NULL) { \
970 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
971 goto err_out; \
972 } \
973 } while (0)
974 #else
975 #define EXT4_PROC_HANDLER(name, var)
976 #endif
977
978 /*
979 * Function prototypes
980 */
981
982 /*
983 * Ok, these declarations are also in <linux/kernel.h> but none of the
984 * ext4 source programs needs to include it so they are duplicated here.
985 */
986 # define NORET_TYPE /**/
987 # define ATTRIB_NORET __attribute__((noreturn))
988 # define NORET_AND noreturn,
989
990 /* balloc.c */
991 extern unsigned int ext4_block_group(struct super_block *sb,
992 ext4_fsblk_t blocknr);
993 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
994 ext4_fsblk_t blocknr);
995 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
996 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
997 ext4_group_t group);
998 extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
999 ext4_fsblk_t goal, int *errp);
1000 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1001 ext4_fsblk_t goal, unsigned long *count, int *errp);
1002 extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
1003 ext4_lblk_t iblock, ext4_fsblk_t goal,
1004 unsigned long *count, int *errp);
1005 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1006 extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
1007 s64 nblocks);
1008 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1009 ext4_fsblk_t block, unsigned long count, int metadata);
1010 extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
1011 ext4_fsblk_t block, unsigned long count,
1012 unsigned long *pdquot_freed_blocks);
1013 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1014 extern void ext4_check_blocks_bitmap(struct super_block *);
1015 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1016 ext4_group_t block_group,
1017 struct buffer_head ** bh);
1018 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1019
1020 /* dir.c */
1021 extern int ext4_check_dir_entry(const char *, struct inode *,
1022 struct ext4_dir_entry_2 *,
1023 struct buffer_head *, unsigned long);
1024 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1025 __u32 minor_hash,
1026 struct ext4_dir_entry_2 *dirent);
1027 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1028
1029 /* fsync.c */
1030 extern int ext4_sync_file(struct file *, struct dentry *, int);
1031
1032 /* hash.c */
1033 extern int ext4fs_dirhash(const char *name, int len, struct
1034 dx_hash_info *hinfo);
1035
1036 /* ialloc.c */
1037 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1038 extern void ext4_free_inode(handle_t *, struct inode *);
1039 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1040 extern unsigned long ext4_count_free_inodes(struct super_block *);
1041 extern unsigned long ext4_count_dirs(struct super_block *);
1042 extern void ext4_check_inodes_bitmap(struct super_block *);
1043 extern unsigned long ext4_count_free(struct buffer_head *, unsigned);
1044
1045 /* mballoc.c */
1046 extern long ext4_mb_stats;
1047 extern long ext4_mb_max_to_scan;
1048 extern int ext4_mb_init(struct super_block *, int);
1049 extern int ext4_mb_release(struct super_block *);
1050 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1051 struct ext4_allocation_request *, int *);
1052 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1053 extern void ext4_discard_preallocations(struct inode *);
1054 extern int __init init_ext4_mballoc(void);
1055 extern void exit_ext4_mballoc(void);
1056 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1057 unsigned long, unsigned long, int, unsigned long *);
1058 extern int ext4_mb_add_more_groupinfo(struct super_block *sb,
1059 ext4_group_t i, struct ext4_group_desc *desc);
1060 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1061 ext4_grpblk_t add);
1062
1063
1064 /* inode.c */
1065 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1066 struct buffer_head *bh, ext4_fsblk_t blocknr);
1067 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1068 ext4_lblk_t, int, int *);
1069 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1070 ext4_lblk_t, int, int *);
1071 int ext4_get_block(struct inode *inode, sector_t iblock,
1072 struct buffer_head *bh_result, int create);
1073 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1074 ext4_lblk_t iblock, unsigned long maxblocks,
1075 struct buffer_head *bh_result,
1076 int create, int extend_disksize);
1077
1078 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1079 extern int ext4_write_inode(struct inode *, int);
1080 extern int ext4_setattr(struct dentry *, struct iattr *);
1081 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1082 struct kstat *stat);
1083 extern void ext4_delete_inode(struct inode *);
1084 extern int ext4_sync_inode(handle_t *, struct inode *);
1085 extern void ext4_dirty_inode(struct inode *);
1086 extern int ext4_change_inode_journal_flag(struct inode *, int);
1087 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1088 extern int ext4_can_truncate(struct inode *inode);
1089 extern void ext4_truncate(struct inode *);
1090 extern void ext4_set_inode_flags(struct inode *);
1091 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1092 extern void ext4_set_aops(struct inode *inode);
1093 extern int ext4_writepage_trans_blocks(struct inode *);
1094 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1095 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1096 extern int ext4_block_truncate_page(handle_t *handle,
1097 struct address_space *mapping, loff_t from);
1098 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1099
1100 /* ioctl.c */
1101 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1102 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1103
1104 /* migrate.c */
1105 extern int ext4_ext_migrate(struct inode *);
1106 /* namei.c */
1107 extern int ext4_orphan_add(handle_t *, struct inode *);
1108 extern int ext4_orphan_del(handle_t *, struct inode *);
1109 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1110 __u32 start_minor_hash, __u32 *next_hash);
1111
1112 /* resize.c */
1113 extern int ext4_group_add(struct super_block *sb,
1114 struct ext4_new_group_data *input);
1115 extern int ext4_group_extend(struct super_block *sb,
1116 struct ext4_super_block *es,
1117 ext4_fsblk_t n_blocks_count);
1118
1119 /* super.c */
1120 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1121 __attribute__ ((format (printf, 3, 4)));
1122 extern void __ext4_std_error(struct super_block *, const char *, int);
1123 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1124 __attribute__ ((format (printf, 3, 4)));
1125 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1126 __attribute__ ((format (printf, 3, 4)));
1127 extern void ext4_update_dynamic_rev(struct super_block *sb);
1128 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1129 __u32 compat);
1130 extern int ext4_update_rocompat_feature(handle_t *handle,
1131 struct super_block *sb, __u32 rocompat);
1132 extern int ext4_update_incompat_feature(handle_t *handle,
1133 struct super_block *sb, __u32 incompat);
1134 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1135 struct ext4_group_desc *bg);
1136 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1137 struct ext4_group_desc *bg);
1138 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1139 struct ext4_group_desc *bg);
1140 extern void ext4_block_bitmap_set(struct super_block *sb,
1141 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1142 extern void ext4_inode_bitmap_set(struct super_block *sb,
1143 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1144 extern void ext4_inode_table_set(struct super_block *sb,
1145 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1146
1147 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1148 {
1149 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1150 le32_to_cpu(es->s_blocks_count_lo);
1151 }
1152
1153 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1154 {
1155 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1156 le32_to_cpu(es->s_r_blocks_count_lo);
1157 }
1158
1159 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1160 {
1161 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1162 le32_to_cpu(es->s_free_blocks_count_lo);
1163 }
1164
1165 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1166 ext4_fsblk_t blk)
1167 {
1168 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1169 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1170 }
1171
1172 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1173 ext4_fsblk_t blk)
1174 {
1175 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1176 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1177 }
1178
1179 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1180 ext4_fsblk_t blk)
1181 {
1182 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1183 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1184 }
1185
1186 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1187 {
1188 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1189 le32_to_cpu(raw_inode->i_size_lo);
1190 }
1191
1192 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1193 {
1194 raw_inode->i_size_lo = cpu_to_le32(i_size);
1195 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1196 }
1197
1198 static inline
1199 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1200 ext4_group_t group)
1201 {
1202 struct ext4_group_info ***grp_info;
1203 long indexv, indexh;
1204 grp_info = EXT4_SB(sb)->s_group_info;
1205 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1206 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1207 return grp_info[indexv][indexh];
1208 }
1209
1210
1211 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1212 ext4_group_t block_group)
1213 {
1214 return block_group >> sbi->s_log_groups_per_flex;
1215 }
1216
1217 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1218 {
1219 return 1 << sbi->s_log_groups_per_flex;
1220 }
1221
1222 #define ext4_std_error(sb, errno) \
1223 do { \
1224 if ((errno)) \
1225 __ext4_std_error((sb), __func__, (errno)); \
1226 } while (0)
1227
1228 #ifdef CONFIG_SMP
1229 /* Each CPU can accumulate FBC_BATCH blocks in their local
1230 * counters. So we need to make sure we have free blocks more
1231 * than FBC_BATCH * nr_cpu_ids. Also add a window of 4 times.
1232 */
1233 #define EXT4_FREEBLOCKS_WATERMARK (4 * (FBC_BATCH * nr_cpu_ids))
1234 #else
1235 #define EXT4_FREEBLOCKS_WATERMARK 0
1236 #endif
1237
1238 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1239 {
1240 /*
1241 * XXX: replace with spinlock if seen contended -bzzz
1242 */
1243 down_write(&EXT4_I(inode)->i_data_sem);
1244 if (newsize > EXT4_I(inode)->i_disksize)
1245 EXT4_I(inode)->i_disksize = newsize;
1246 up_write(&EXT4_I(inode)->i_data_sem);
1247 return ;
1248 }
1249
1250 /*
1251 * Inodes and files operations
1252 */
1253
1254 /* dir.c */
1255 extern const struct file_operations ext4_dir_operations;
1256
1257 /* file.c */
1258 extern const struct inode_operations ext4_file_inode_operations;
1259 extern const struct file_operations ext4_file_operations;
1260
1261 /* namei.c */
1262 extern const struct inode_operations ext4_dir_inode_operations;
1263 extern const struct inode_operations ext4_special_inode_operations;
1264
1265 /* symlink.c */
1266 extern const struct inode_operations ext4_symlink_inode_operations;
1267 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1268
1269 /* extents.c */
1270 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1271 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1272 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1273 int chunk);
1274 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1275 ext4_lblk_t iblock,
1276 unsigned long max_blocks, struct buffer_head *bh_result,
1277 int create, int extend_disksize);
1278 extern void ext4_ext_truncate(struct inode *);
1279 extern void ext4_ext_init(struct super_block *);
1280 extern void ext4_ext_release(struct super_block *);
1281 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1282 loff_t len);
1283 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1284 sector_t block, unsigned long max_blocks,
1285 struct buffer_head *bh, int create,
1286 int extend_disksize, int flag);
1287 #endif /* __KERNEL__ */
1288
1289 #endif /* _EXT4_H */
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