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ext4: Use inode preallocation with -o noextents
[deliverable/linux.git] / fs / ext4 / ext4.h
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
78 struct ext4_allocation_request {
79 /* target inode for block we're allocating */
80 struct inode *inode;
81 /* logical block in target inode */
82 ext4_lblk_t logical;
83 /* phys. target (a hint) */
84 ext4_fsblk_t goal;
85 /* the closest logical allocated block to the left */
86 ext4_lblk_t lleft;
87 /* phys. block for ^^^ */
88 ext4_fsblk_t pleft;
89 /* the closest logical allocated block to the right */
90 ext4_lblk_t lright;
91 /* phys. block for ^^^ */
92 ext4_fsblk_t pright;
93 /* how many blocks we want to allocate */
94 unsigned long len;
95 /* flags. see above EXT4_MB_HINT_* */
96 unsigned long flags;
97 };
98
99 /*
100 * Special inodes numbers
101 */
102 #define EXT4_BAD_INO 1 /* Bad blocks inode */
103 #define EXT4_ROOT_INO 2 /* Root inode */
104 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
105 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
106 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
107 #define EXT4_JOURNAL_INO 8 /* Journal inode */
108
109 /* First non-reserved inode for old ext4 filesystems */
110 #define EXT4_GOOD_OLD_FIRST_INO 11
111
112 /*
113 * Maximal count of links to a file
114 */
115 #define EXT4_LINK_MAX 65000
116
117 /*
118 * Macro-instructions used to manage several block sizes
119 */
120 #define EXT4_MIN_BLOCK_SIZE 1024
121 #define EXT4_MAX_BLOCK_SIZE 65536
122 #define EXT4_MIN_BLOCK_LOG_SIZE 10
123 #ifdef __KERNEL__
124 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
125 #else
126 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
127 #endif
128 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
129 #ifdef __KERNEL__
130 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
131 #else
132 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
133 #endif
134 #ifdef __KERNEL__
135 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
136 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
137 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
138 #else
139 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
140 EXT4_GOOD_OLD_INODE_SIZE : \
141 (s)->s_inode_size)
142 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
143 EXT4_GOOD_OLD_FIRST_INO : \
144 (s)->s_first_ino)
145 #endif
146 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
147
148 /*
149 * Structure of a blocks group descriptor
150 */
151 struct ext4_group_desc
152 {
153 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
154 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
155 __le32 bg_inode_table_lo; /* Inodes table block */
156 __le16 bg_free_blocks_count; /* Free blocks count */
157 __le16 bg_free_inodes_count; /* Free inodes count */
158 __le16 bg_used_dirs_count; /* Directories count */
159 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
160 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
161 __le16 bg_itable_unused; /* Unused inodes count */
162 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
163 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
164 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
165 __le32 bg_inode_table_hi; /* Inodes table block MSB */
166 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
167 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
168 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
169 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
170 __u32 bg_reserved2[3];
171 };
172
173 /*
174 * Structure of a flex block group info
175 */
176
177 struct flex_groups {
178 __u32 free_inodes;
179 __u32 free_blocks;
180 };
181
182 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
183 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
184 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
185
186 #ifdef __KERNEL__
187 #include "ext4_sb.h"
188 #endif
189 /*
190 * Macro-instructions used to manage group descriptors
191 */
192 #define EXT4_MIN_DESC_SIZE 32
193 #define EXT4_MIN_DESC_SIZE_64BIT 64
194 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
195 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
196 #ifdef __KERNEL__
197 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
198 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
199 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
200 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
201 #else
202 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
203 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
204 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
205 #endif
206
207 /*
208 * Constants relative to the data blocks
209 */
210 #define EXT4_NDIR_BLOCKS 12
211 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
212 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
213 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
214 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
215
216 /*
217 * Inode flags
218 */
219 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
220 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
221 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
222 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
223 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
224 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
225 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
226 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
227 /* Reserved for compression usage... */
228 #define EXT4_DIRTY_FL 0x00000100
229 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
230 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
231 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
232 /* End compression flags --- maybe not all used */
233 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
234 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
235 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
236 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
237 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
238 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
239 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
240 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
241 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
242 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
243
244 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
245 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
246
247 /*
248 * Inode dynamic state flags
249 */
250 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
251 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
252 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
253 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
254
255 /* Used to pass group descriptor data when online resize is done */
256 struct ext4_new_group_input {
257 __u32 group; /* Group number for this data */
258 __u64 block_bitmap; /* Absolute block number of block bitmap */
259 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
260 __u64 inode_table; /* Absolute block number of inode table start */
261 __u32 blocks_count; /* Total number of blocks in this group */
262 __u16 reserved_blocks; /* Number of reserved blocks in this group */
263 __u16 unused;
264 };
265
266 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
267 struct ext4_new_group_data {
268 __u32 group;
269 __u64 block_bitmap;
270 __u64 inode_bitmap;
271 __u64 inode_table;
272 __u32 blocks_count;
273 __u16 reserved_blocks;
274 __u16 unused;
275 __u32 free_blocks_count;
276 };
277
278 /*
279 * Following is used by preallocation code to tell get_blocks() that we
280 * want uninitialzed extents.
281 */
282 #define EXT4_CREATE_UNINITIALIZED_EXT 2
283
284 /*
285 * ioctl commands
286 */
287 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
288 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
289 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
290 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
291 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
292 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
293 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
294 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
295 #ifdef CONFIG_JBD2_DEBUG
296 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
297 #endif
298 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
299 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
300 #define EXT4_IOC_MIGRATE _IO('f', 7)
301
302 /*
303 * ioctl commands in 32 bit emulation
304 */
305 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
306 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
307 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
308 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
309 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
310 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
311 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
312 #ifdef CONFIG_JBD2_DEBUG
313 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
314 #endif
315 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
316 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
317
318
319 /*
320 * Mount options
321 */
322 struct ext4_mount_options {
323 unsigned long s_mount_opt;
324 uid_t s_resuid;
325 gid_t s_resgid;
326 unsigned long s_commit_interval;
327 #ifdef CONFIG_QUOTA
328 int s_jquota_fmt;
329 char *s_qf_names[MAXQUOTAS];
330 #endif
331 };
332
333 /*
334 * Structure of an inode on the disk
335 */
336 struct ext4_inode {
337 __le16 i_mode; /* File mode */
338 __le16 i_uid; /* Low 16 bits of Owner Uid */
339 __le32 i_size_lo; /* Size in bytes */
340 __le32 i_atime; /* Access time */
341 __le32 i_ctime; /* Inode Change time */
342 __le32 i_mtime; /* Modification time */
343 __le32 i_dtime; /* Deletion Time */
344 __le16 i_gid; /* Low 16 bits of Group Id */
345 __le16 i_links_count; /* Links count */
346 __le32 i_blocks_lo; /* Blocks count */
347 __le32 i_flags; /* File flags */
348 union {
349 struct {
350 __le32 l_i_version;
351 } linux1;
352 struct {
353 __u32 h_i_translator;
354 } hurd1;
355 struct {
356 __u32 m_i_reserved1;
357 } masix1;
358 } osd1; /* OS dependent 1 */
359 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
360 __le32 i_generation; /* File version (for NFS) */
361 __le32 i_file_acl_lo; /* File ACL */
362 __le32 i_size_high;
363 __le32 i_obso_faddr; /* Obsoleted fragment address */
364 union {
365 struct {
366 __le16 l_i_blocks_high; /* were l_i_reserved1 */
367 __le16 l_i_file_acl_high;
368 __le16 l_i_uid_high; /* these 2 fields */
369 __le16 l_i_gid_high; /* were reserved2[0] */
370 __u32 l_i_reserved2;
371 } linux2;
372 struct {
373 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
374 __u16 h_i_mode_high;
375 __u16 h_i_uid_high;
376 __u16 h_i_gid_high;
377 __u32 h_i_author;
378 } hurd2;
379 struct {
380 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
381 __le16 m_i_file_acl_high;
382 __u32 m_i_reserved2[2];
383 } masix2;
384 } osd2; /* OS dependent 2 */
385 __le16 i_extra_isize;
386 __le16 i_pad1;
387 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
388 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
389 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
390 __le32 i_crtime; /* File Creation time */
391 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
392 __le32 i_version_hi; /* high 32 bits for 64-bit version */
393 };
394
395
396 #define EXT4_EPOCH_BITS 2
397 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
398 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
399
400 /*
401 * Extended fields will fit into an inode if the filesystem was formatted
402 * with large inodes (-I 256 or larger) and there are not currently any EAs
403 * consuming all of the available space. For new inodes we always reserve
404 * enough space for the kernel's known extended fields, but for inodes
405 * created with an old kernel this might not have been the case. None of
406 * the extended inode fields is critical for correct filesystem operation.
407 * This macro checks if a certain field fits in the inode. Note that
408 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
409 */
410 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
411 ((offsetof(typeof(*ext4_inode), field) + \
412 sizeof((ext4_inode)->field)) \
413 <= (EXT4_GOOD_OLD_INODE_SIZE + \
414 (einode)->i_extra_isize)) \
415
416 static inline __le32 ext4_encode_extra_time(struct timespec *time)
417 {
418 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
419 time->tv_sec >> 32 : 0) |
420 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
421 }
422
423 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
424 {
425 if (sizeof(time->tv_sec) > 4)
426 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
427 << 32;
428 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
429 }
430
431 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
432 do { \
433 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
434 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
435 (raw_inode)->xtime ## _extra = \
436 ext4_encode_extra_time(&(inode)->xtime); \
437 } while (0)
438
439 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
440 do { \
441 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
442 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
443 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
444 (raw_inode)->xtime ## _extra = \
445 ext4_encode_extra_time(&(einode)->xtime); \
446 } while (0)
447
448 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
449 do { \
450 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
451 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
452 ext4_decode_extra_time(&(inode)->xtime, \
453 raw_inode->xtime ## _extra); \
454 } while (0)
455
456 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
457 do { \
458 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
459 (einode)->xtime.tv_sec = \
460 (signed)le32_to_cpu((raw_inode)->xtime); \
461 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
462 ext4_decode_extra_time(&(einode)->xtime, \
463 raw_inode->xtime ## _extra); \
464 } while (0)
465
466 #define i_disk_version osd1.linux1.l_i_version
467
468 #if defined(__KERNEL__) || defined(__linux__)
469 #define i_reserved1 osd1.linux1.l_i_reserved1
470 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
471 #define i_blocks_high osd2.linux2.l_i_blocks_high
472 #define i_uid_low i_uid
473 #define i_gid_low i_gid
474 #define i_uid_high osd2.linux2.l_i_uid_high
475 #define i_gid_high osd2.linux2.l_i_gid_high
476 #define i_reserved2 osd2.linux2.l_i_reserved2
477
478 #elif defined(__GNU__)
479
480 #define i_translator osd1.hurd1.h_i_translator
481 #define i_uid_high osd2.hurd2.h_i_uid_high
482 #define i_gid_high osd2.hurd2.h_i_gid_high
483 #define i_author osd2.hurd2.h_i_author
484
485 #elif defined(__masix__)
486
487 #define i_reserved1 osd1.masix1.m_i_reserved1
488 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
489 #define i_reserved2 osd2.masix2.m_i_reserved2
490
491 #endif /* defined(__KERNEL__) || defined(__linux__) */
492
493 /*
494 * File system states
495 */
496 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
497 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
498 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
499
500 /*
501 * Misc. filesystem flags
502 */
503 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
504 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
505 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
506
507 /*
508 * Mount flags
509 */
510 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
511 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
512 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
513 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
514 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
515 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
516 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
517 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
518 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
519 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
520 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
521 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
522 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
523 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
524 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
525 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
526 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
527 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
528 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
529 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
530 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
531 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
532 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
533 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
534 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
535 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
536 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
537 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
538 #define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
539 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
540 #ifndef _LINUX_EXT2_FS_H
541 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
542 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
543 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
544 EXT4_MOUNT_##opt)
545 #else
546 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
547 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
548 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
549 #endif
550
551 #define ext4_set_bit ext2_set_bit
552 #define ext4_set_bit_atomic ext2_set_bit_atomic
553 #define ext4_clear_bit ext2_clear_bit
554 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
555 #define ext4_test_bit ext2_test_bit
556 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
557 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
558 #define ext4_find_next_bit ext2_find_next_bit
559
560 /*
561 * Maximal mount counts between two filesystem checks
562 */
563 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
564 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
565
566 /*
567 * Behaviour when detecting errors
568 */
569 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
570 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
571 #define EXT4_ERRORS_PANIC 3 /* Panic */
572 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
573
574 /*
575 * Structure of the super block
576 */
577 struct ext4_super_block {
578 /*00*/ __le32 s_inodes_count; /* Inodes count */
579 __le32 s_blocks_count_lo; /* Blocks count */
580 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
581 __le32 s_free_blocks_count_lo; /* Free blocks count */
582 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
583 __le32 s_first_data_block; /* First Data Block */
584 __le32 s_log_block_size; /* Block size */
585 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
586 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
587 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
588 __le32 s_inodes_per_group; /* # Inodes per group */
589 __le32 s_mtime; /* Mount time */
590 /*30*/ __le32 s_wtime; /* Write time */
591 __le16 s_mnt_count; /* Mount count */
592 __le16 s_max_mnt_count; /* Maximal mount count */
593 __le16 s_magic; /* Magic signature */
594 __le16 s_state; /* File system state */
595 __le16 s_errors; /* Behaviour when detecting errors */
596 __le16 s_minor_rev_level; /* minor revision level */
597 /*40*/ __le32 s_lastcheck; /* time of last check */
598 __le32 s_checkinterval; /* max. time between checks */
599 __le32 s_creator_os; /* OS */
600 __le32 s_rev_level; /* Revision level */
601 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
602 __le16 s_def_resgid; /* Default gid for reserved blocks */
603 /*
604 * These fields are for EXT4_DYNAMIC_REV superblocks only.
605 *
606 * Note: the difference between the compatible feature set and
607 * the incompatible feature set is that if there is a bit set
608 * in the incompatible feature set that the kernel doesn't
609 * know about, it should refuse to mount the filesystem.
610 *
611 * e2fsck's requirements are more strict; if it doesn't know
612 * about a feature in either the compatible or incompatible
613 * feature set, it must abort and not try to meddle with
614 * things it doesn't understand...
615 */
616 __le32 s_first_ino; /* First non-reserved inode */
617 __le16 s_inode_size; /* size of inode structure */
618 __le16 s_block_group_nr; /* block group # of this superblock */
619 __le32 s_feature_compat; /* compatible feature set */
620 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
621 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
622 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
623 /*78*/ char s_volume_name[16]; /* volume name */
624 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
625 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
626 /*
627 * Performance hints. Directory preallocation should only
628 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
629 */
630 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
631 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
632 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
633 /*
634 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
635 */
636 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
637 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
638 __le32 s_journal_dev; /* device number of journal file */
639 __le32 s_last_orphan; /* start of list of inodes to delete */
640 __le32 s_hash_seed[4]; /* HTREE hash seed */
641 __u8 s_def_hash_version; /* Default hash version to use */
642 __u8 s_reserved_char_pad;
643 __le16 s_desc_size; /* size of group descriptor */
644 /*100*/ __le32 s_default_mount_opts;
645 __le32 s_first_meta_bg; /* First metablock block group */
646 __le32 s_mkfs_time; /* When the filesystem was created */
647 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
648 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
649 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
650 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
651 __le32 s_free_blocks_count_hi; /* Free blocks count */
652 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
653 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
654 __le32 s_flags; /* Miscellaneous flags */
655 __le16 s_raid_stride; /* RAID stride */
656 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
657 __le64 s_mmp_block; /* Block for multi-mount protection */
658 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
659 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
660 __u8 s_reserved_char_pad2;
661 __le16 s_reserved_pad;
662 __u32 s_reserved[162]; /* Padding to the end of the block */
663 };
664
665 #ifdef __KERNEL__
666 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
667 {
668 return sb->s_fs_info;
669 }
670 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
671 {
672 return container_of(inode, struct ext4_inode_info, vfs_inode);
673 }
674
675 static inline struct timespec ext4_current_time(struct inode *inode)
676 {
677 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
678 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
679 }
680
681
682 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
683 {
684 return ino == EXT4_ROOT_INO ||
685 ino == EXT4_JOURNAL_INO ||
686 ino == EXT4_RESIZE_INO ||
687 (ino >= EXT4_FIRST_INO(sb) &&
688 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
689 }
690 #else
691 /* Assume that user mode programs are passing in an ext4fs superblock, not
692 * a kernel struct super_block. This will allow us to call the feature-test
693 * macros from user land. */
694 #define EXT4_SB(sb) (sb)
695 #endif
696
697 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
698
699 /*
700 * Codes for operating systems
701 */
702 #define EXT4_OS_LINUX 0
703 #define EXT4_OS_HURD 1
704 #define EXT4_OS_MASIX 2
705 #define EXT4_OS_FREEBSD 3
706 #define EXT4_OS_LITES 4
707
708 /*
709 * Revision levels
710 */
711 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
712 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
713
714 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
715 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
716
717 #define EXT4_GOOD_OLD_INODE_SIZE 128
718
719 /*
720 * Feature set definitions
721 */
722
723 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
724 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
725 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
726 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
727 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
728 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
729 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
730 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
731 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
732 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
733 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
734 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
735 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
736 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
737 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
738 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
739 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
740 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
741
742 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
743 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
744 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
745 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
746 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
747 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
748
749 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
750 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
751 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
752 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
753 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
754 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
755 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
756
757 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
758 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
759 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
760 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
761 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
762 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
763 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
764 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
765 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
766
767 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
768 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
769 EXT4_FEATURE_INCOMPAT_RECOVER| \
770 EXT4_FEATURE_INCOMPAT_META_BG| \
771 EXT4_FEATURE_INCOMPAT_EXTENTS| \
772 EXT4_FEATURE_INCOMPAT_64BIT| \
773 EXT4_FEATURE_INCOMPAT_FLEX_BG)
774 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
775 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
776 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
777 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
778 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
779 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
780 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
781
782 /*
783 * Default values for user and/or group using reserved blocks
784 */
785 #define EXT4_DEF_RESUID 0
786 #define EXT4_DEF_RESGID 0
787
788 /*
789 * Default mount options
790 */
791 #define EXT4_DEFM_DEBUG 0x0001
792 #define EXT4_DEFM_BSDGROUPS 0x0002
793 #define EXT4_DEFM_XATTR_USER 0x0004
794 #define EXT4_DEFM_ACL 0x0008
795 #define EXT4_DEFM_UID16 0x0010
796 #define EXT4_DEFM_JMODE 0x0060
797 #define EXT4_DEFM_JMODE_DATA 0x0020
798 #define EXT4_DEFM_JMODE_ORDERED 0x0040
799 #define EXT4_DEFM_JMODE_WBACK 0x0060
800
801 /*
802 * Structure of a directory entry
803 */
804 #define EXT4_NAME_LEN 255
805
806 struct ext4_dir_entry {
807 __le32 inode; /* Inode number */
808 __le16 rec_len; /* Directory entry length */
809 __le16 name_len; /* Name length */
810 char name[EXT4_NAME_LEN]; /* File name */
811 };
812
813 /*
814 * The new version of the directory entry. Since EXT4 structures are
815 * stored in intel byte order, and the name_len field could never be
816 * bigger than 255 chars, it's safe to reclaim the extra byte for the
817 * file_type field.
818 */
819 struct ext4_dir_entry_2 {
820 __le32 inode; /* Inode number */
821 __le16 rec_len; /* Directory entry length */
822 __u8 name_len; /* Name length */
823 __u8 file_type;
824 char name[EXT4_NAME_LEN]; /* File name */
825 };
826
827 /*
828 * Ext4 directory file types. Only the low 3 bits are used. The
829 * other bits are reserved for now.
830 */
831 #define EXT4_FT_UNKNOWN 0
832 #define EXT4_FT_REG_FILE 1
833 #define EXT4_FT_DIR 2
834 #define EXT4_FT_CHRDEV 3
835 #define EXT4_FT_BLKDEV 4
836 #define EXT4_FT_FIFO 5
837 #define EXT4_FT_SOCK 6
838 #define EXT4_FT_SYMLINK 7
839
840 #define EXT4_FT_MAX 8
841
842 /*
843 * EXT4_DIR_PAD defines the directory entries boundaries
844 *
845 * NOTE: It must be a multiple of 4
846 */
847 #define EXT4_DIR_PAD 4
848 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
849 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
850 ~EXT4_DIR_ROUND)
851 #define EXT4_MAX_REC_LEN ((1<<16)-1)
852
853 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
854 {
855 unsigned len = le16_to_cpu(dlen);
856
857 if (len == EXT4_MAX_REC_LEN)
858 return 1 << 16;
859 return len;
860 }
861
862 static inline __le16 ext4_rec_len_to_disk(unsigned len)
863 {
864 if (len == (1 << 16))
865 return cpu_to_le16(EXT4_MAX_REC_LEN);
866 else if (len > (1 << 16))
867 BUG();
868 return cpu_to_le16(len);
869 }
870
871 /*
872 * Hash Tree Directory indexing
873 * (c) Daniel Phillips, 2001
874 */
875
876 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
877 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
878 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
879 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
880 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
881
882 /* Legal values for the dx_root hash_version field: */
883
884 #define DX_HASH_LEGACY 0
885 #define DX_HASH_HALF_MD4 1
886 #define DX_HASH_TEA 2
887
888 #ifdef __KERNEL__
889
890 /* hash info structure used by the directory hash */
891 struct dx_hash_info
892 {
893 u32 hash;
894 u32 minor_hash;
895 int hash_version;
896 u32 *seed;
897 };
898
899 #define EXT4_HTREE_EOF 0x7fffffff
900
901 /*
902 * Control parameters used by ext4_htree_next_block
903 */
904 #define HASH_NB_ALWAYS 1
905
906
907 /*
908 * Describe an inode's exact location on disk and in memory
909 */
910 struct ext4_iloc
911 {
912 struct buffer_head *bh;
913 unsigned long offset;
914 ext4_group_t block_group;
915 };
916
917 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
918 {
919 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
920 }
921
922 /*
923 * This structure is stuffed into the struct file's private_data field
924 * for directories. It is where we put information so that we can do
925 * readdir operations in hash tree order.
926 */
927 struct dir_private_info {
928 struct rb_root root;
929 struct rb_node *curr_node;
930 struct fname *extra_fname;
931 loff_t last_pos;
932 __u32 curr_hash;
933 __u32 curr_minor_hash;
934 __u32 next_hash;
935 };
936
937 /* calculate the first block number of the group */
938 static inline ext4_fsblk_t
939 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
940 {
941 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
942 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
943 }
944
945 /*
946 * Special error return code only used by dx_probe() and its callers.
947 */
948 #define ERR_BAD_DX_DIR -75000
949
950 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
951 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
952
953 /*
954 * Function prototypes
955 */
956
957 /*
958 * Ok, these declarations are also in <linux/kernel.h> but none of the
959 * ext4 source programs needs to include it so they are duplicated here.
960 */
961 # define NORET_TYPE /**/
962 # define ATTRIB_NORET __attribute__((noreturn))
963 # define NORET_AND noreturn,
964
965 /* balloc.c */
966 extern unsigned int ext4_block_group(struct super_block *sb,
967 ext4_fsblk_t blocknr);
968 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
969 ext4_fsblk_t blocknr);
970 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
971 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
972 ext4_group_t group);
973 extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
974 ext4_fsblk_t goal, int *errp);
975 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
976 ext4_fsblk_t goal, unsigned long *count, int *errp);
977 extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
978 ext4_lblk_t iblock, ext4_fsblk_t goal,
979 unsigned long *count, int *errp);
980 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
981 ext4_fsblk_t goal, unsigned long *count, int *errp);
982 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
983 ext4_fsblk_t block, unsigned long count, int metadata);
984 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
985 ext4_fsblk_t block, unsigned long count,
986 unsigned long *pdquot_freed_blocks);
987 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
988 extern void ext4_check_blocks_bitmap (struct super_block *);
989 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
990 ext4_group_t block_group,
991 struct buffer_head ** bh);
992 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
993 extern void ext4_init_block_alloc_info(struct inode *);
994 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
995
996 /* dir.c */
997 extern int ext4_check_dir_entry(const char *, struct inode *,
998 struct ext4_dir_entry_2 *,
999 struct buffer_head *, unsigned long);
1000 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1001 __u32 minor_hash,
1002 struct ext4_dir_entry_2 *dirent);
1003 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1004
1005 /* fsync.c */
1006 extern int ext4_sync_file (struct file *, struct dentry *, int);
1007
1008 /* hash.c */
1009 extern int ext4fs_dirhash(const char *name, int len, struct
1010 dx_hash_info *hinfo);
1011
1012 /* ialloc.c */
1013 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
1014 extern void ext4_free_inode (handle_t *, struct inode *);
1015 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
1016 extern unsigned long ext4_count_free_inodes (struct super_block *);
1017 extern unsigned long ext4_count_dirs (struct super_block *);
1018 extern void ext4_check_inodes_bitmap (struct super_block *);
1019 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
1020
1021 /* mballoc.c */
1022 extern long ext4_mb_stats;
1023 extern long ext4_mb_max_to_scan;
1024 extern int ext4_mb_init(struct super_block *, int);
1025 extern int ext4_mb_release(struct super_block *);
1026 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1027 struct ext4_allocation_request *, int *);
1028 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1029 extern void ext4_mb_discard_inode_preallocations(struct inode *);
1030 extern int __init init_ext4_mballoc(void);
1031 extern void exit_ext4_mballoc(void);
1032 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1033 unsigned long, unsigned long, int, unsigned long *);
1034
1035
1036 /* inode.c */
1037 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1038 struct buffer_head *bh, ext4_fsblk_t blocknr);
1039 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1040 ext4_lblk_t, int, int *);
1041 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1042 ext4_lblk_t, int, int *);
1043 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1044 ext4_lblk_t iblock, unsigned long maxblocks,
1045 struct buffer_head *bh_result,
1046 int create, int extend_disksize);
1047
1048 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1049 extern int ext4_write_inode (struct inode *, int);
1050 extern int ext4_setattr (struct dentry *, struct iattr *);
1051 extern void ext4_delete_inode (struct inode *);
1052 extern int ext4_sync_inode (handle_t *, struct inode *);
1053 extern void ext4_discard_reservation (struct inode *);
1054 extern void ext4_dirty_inode(struct inode *);
1055 extern int ext4_change_inode_journal_flag(struct inode *, int);
1056 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1057 extern int ext4_can_truncate(struct inode *inode);
1058 extern void ext4_truncate (struct inode *);
1059 extern void ext4_set_inode_flags(struct inode *);
1060 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1061 extern void ext4_set_aops(struct inode *inode);
1062 extern int ext4_writepage_trans_blocks(struct inode *);
1063 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1064 struct address_space *mapping, loff_t from);
1065
1066 /* ioctl.c */
1067 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1068 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1069
1070 /* migrate.c */
1071 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1072 unsigned long);
1073 /* namei.c */
1074 extern int ext4_orphan_add(handle_t *, struct inode *);
1075 extern int ext4_orphan_del(handle_t *, struct inode *);
1076 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1077 __u32 start_minor_hash, __u32 *next_hash);
1078
1079 /* resize.c */
1080 extern int ext4_group_add(struct super_block *sb,
1081 struct ext4_new_group_data *input);
1082 extern int ext4_group_extend(struct super_block *sb,
1083 struct ext4_super_block *es,
1084 ext4_fsblk_t n_blocks_count);
1085
1086 /* super.c */
1087 extern void ext4_error (struct super_block *, const char *, const char *, ...)
1088 __attribute__ ((format (printf, 3, 4)));
1089 extern void __ext4_std_error (struct super_block *, const char *, int);
1090 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1091 __attribute__ ((format (printf, 3, 4)));
1092 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1093 __attribute__ ((format (printf, 3, 4)));
1094 extern void ext4_update_dynamic_rev (struct super_block *sb);
1095 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1096 __u32 compat);
1097 extern int ext4_update_rocompat_feature(handle_t *handle,
1098 struct super_block *sb, __u32 rocompat);
1099 extern int ext4_update_incompat_feature(handle_t *handle,
1100 struct super_block *sb, __u32 incompat);
1101 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1102 struct ext4_group_desc *bg);
1103 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1104 struct ext4_group_desc *bg);
1105 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1106 struct ext4_group_desc *bg);
1107 extern void ext4_block_bitmap_set(struct super_block *sb,
1108 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1109 extern void ext4_inode_bitmap_set(struct super_block *sb,
1110 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1111 extern void ext4_inode_table_set(struct super_block *sb,
1112 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1113
1114 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1115 {
1116 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1117 le32_to_cpu(es->s_blocks_count_lo);
1118 }
1119
1120 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1121 {
1122 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1123 le32_to_cpu(es->s_r_blocks_count_lo);
1124 }
1125
1126 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1127 {
1128 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1129 le32_to_cpu(es->s_free_blocks_count_lo);
1130 }
1131
1132 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1133 ext4_fsblk_t blk)
1134 {
1135 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1136 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1137 }
1138
1139 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1140 ext4_fsblk_t blk)
1141 {
1142 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1143 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1144 }
1145
1146 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1147 ext4_fsblk_t blk)
1148 {
1149 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1150 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1151 }
1152
1153 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1154 {
1155 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1156 le32_to_cpu(raw_inode->i_size_lo);
1157 }
1158
1159 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1160 {
1161 raw_inode->i_size_lo = cpu_to_le32(i_size);
1162 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1163 }
1164
1165 static inline
1166 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1167 ext4_group_t group)
1168 {
1169 struct ext4_group_info ***grp_info;
1170 long indexv, indexh;
1171 grp_info = EXT4_SB(sb)->s_group_info;
1172 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1173 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1174 return grp_info[indexv][indexh];
1175 }
1176
1177
1178 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1179 ext4_group_t block_group)
1180 {
1181 return block_group >> sbi->s_log_groups_per_flex;
1182 }
1183
1184 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1185 {
1186 return 1 << sbi->s_log_groups_per_flex;
1187 }
1188
1189 #define ext4_std_error(sb, errno) \
1190 do { \
1191 if ((errno)) \
1192 __ext4_std_error((sb), __func__, (errno)); \
1193 } while (0)
1194
1195 /*
1196 * Inodes and files operations
1197 */
1198
1199 /* dir.c */
1200 extern const struct file_operations ext4_dir_operations;
1201
1202 /* file.c */
1203 extern const struct inode_operations ext4_file_inode_operations;
1204 extern const struct file_operations ext4_file_operations;
1205
1206 /* namei.c */
1207 extern const struct inode_operations ext4_dir_inode_operations;
1208 extern const struct inode_operations ext4_special_inode_operations;
1209
1210 /* symlink.c */
1211 extern const struct inode_operations ext4_symlink_inode_operations;
1212 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1213
1214 /* extents.c */
1215 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1216 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1217 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1218 ext4_lblk_t iblock,
1219 unsigned long max_blocks, struct buffer_head *bh_result,
1220 int create, int extend_disksize);
1221 extern void ext4_ext_truncate(struct inode *, struct page *);
1222 extern void ext4_ext_init(struct super_block *);
1223 extern void ext4_ext_release(struct super_block *);
1224 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1225 loff_t len);
1226 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1227 sector_t block, unsigned long max_blocks,
1228 struct buffer_head *bh, int create,
1229 int extend_disksize);
1230 #endif /* __KERNEL__ */
1231
1232 #endif /* _EXT4_H */
Linux kernel - Deliverables
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