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 <linux/jbd2.h>
23 #include "ext4_i.h"
24
25 /*
26 * The fourth extended filesystem constants/structures
27 */
28
29 /*
30 * Define EXT4FS_DEBUG to produce debug messages
31 */
32 #undef EXT4FS_DEBUG
33
34 /*
35 * Define EXT4_RESERVATION to reserve data blocks for expanding files
36 */
37 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
38 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
39 #define EXT4_MAX_RESERVE_BLOCKS 1027
40 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
41
42 /*
43 * Debug code
44 */
45 #ifdef EXT4FS_DEBUG
46 #define ext4_debug(f, a...) \
47 do { \
48 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __func__); \
50 printk(KERN_DEBUG f, ## a); \
51 } while (0)
52 #else
53 #define ext4_debug(f, a...) do {} while (0)
54 #endif
55
56 #define EXT4_MULTIBLOCK_ALLOCATOR 1
57
58 /* prefer goal again. length */
59 #define EXT4_MB_HINT_MERGE 1
60 /* blocks already reserved */
61 #define EXT4_MB_HINT_RESERVED 2
62 /* metadata is being allocated */
63 #define EXT4_MB_HINT_METADATA 4
64 /* first blocks in the file */
65 #define EXT4_MB_HINT_FIRST 8
66 /* search for the best chunk */
67 #define EXT4_MB_HINT_BEST 16
68 /* data is being allocated */
69 #define EXT4_MB_HINT_DATA 32
70 /* don't preallocate (for tails) */
71 #define EXT4_MB_HINT_NOPREALLOC 64
72 /* allocate for locality group */
73 #define EXT4_MB_HINT_GROUP_ALLOC 128
74 /* allocate goal blocks or none */
75 #define EXT4_MB_HINT_GOAL_ONLY 256
76 /* goal is meaningful */
77 #define EXT4_MB_HINT_TRY_GOAL 512
78 /* blocks already pre-reserved by delayed allocation */
79 #define EXT4_MB_DELALLOC_RESERVED 1024
80
81
82 struct ext4_allocation_request {
83 /* target inode for block we're allocating */
84 struct inode *inode;
85 /* logical block in target inode */
86 ext4_lblk_t logical;
87 /* phys. target (a hint) */
88 ext4_fsblk_t goal;
89 /* the closest logical allocated block to the left */
90 ext4_lblk_t lleft;
91 /* phys. block for ^^^ */
92 ext4_fsblk_t pleft;
93 /* the closest logical allocated block to the right */
94 ext4_lblk_t lright;
95 /* phys. block for ^^^ */
96 ext4_fsblk_t pright;
97 /* how many blocks we want to allocate */
98 unsigned int len;
99 /* flags. see above EXT4_MB_HINT_* */
100 unsigned int flags;
101 };
102
103 /*
104 * Special inodes numbers
105 */
106 #define EXT4_BAD_INO 1 /* Bad blocks inode */
107 #define EXT4_ROOT_INO 2 /* Root inode */
108 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
109 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
110 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
111 #define EXT4_JOURNAL_INO 8 /* Journal inode */
112
113 /* First non-reserved inode for old ext4 filesystems */
114 #define EXT4_GOOD_OLD_FIRST_INO 11
115
116 /*
117 * Maximal count of links to a file
118 */
119 #define EXT4_LINK_MAX 65000
120
121 /*
122 * Macro-instructions used to manage several block sizes
123 */
124 #define EXT4_MIN_BLOCK_SIZE 1024
125 #define EXT4_MAX_BLOCK_SIZE 65536
126 #define EXT4_MIN_BLOCK_LOG_SIZE 10
127 #ifdef __KERNEL__
128 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
129 #else
130 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
131 #endif
132 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
133 #ifdef __KERNEL__
134 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
135 #else
136 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
137 #endif
138 #ifdef __KERNEL__
139 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
140 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
141 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
142 #else
143 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
144 EXT4_GOOD_OLD_INODE_SIZE : \
145 (s)->s_inode_size)
146 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
147 EXT4_GOOD_OLD_FIRST_INO : \
148 (s)->s_first_ino)
149 #endif
150 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
151
152 /*
153 * Structure of a blocks group descriptor
154 */
155 struct ext4_group_desc
156 {
157 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
158 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
159 __le32 bg_inode_table_lo; /* Inodes table block */
160 __le16 bg_free_blocks_count_lo;/* Free blocks count */
161 __le16 bg_free_inodes_count_lo;/* Free inodes count */
162 __le16 bg_used_dirs_count_lo; /* Directories count */
163 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
164 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
165 __le16 bg_itable_unused_lo; /* Unused inodes count */
166 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
167 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
168 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
169 __le32 bg_inode_table_hi; /* Inodes table block MSB */
170 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
171 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
172 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
173 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
174 __u32 bg_reserved2[3];
175 };
176
177 /*
178 * Structure of a flex block group info
179 */
180
181 struct flex_groups {
182 __u32 free_inodes;
183 __u32 free_blocks;
184 };
185
186 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
187 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
188 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
189
190 #ifdef __KERNEL__
191 #include "ext4_sb.h"
192 #endif
193 /*
194 * Macro-instructions used to manage group descriptors
195 */
196 #define EXT4_MIN_DESC_SIZE 32
197 #define EXT4_MIN_DESC_SIZE_64BIT 64
198 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
199 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
200 #ifdef __KERNEL__
201 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
202 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
203 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
204 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
205 #else
206 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
207 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
208 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
209 #endif
210
211 /*
212 * Constants relative to the data blocks
213 */
214 #define EXT4_NDIR_BLOCKS 12
215 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
216 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
217 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
218 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
219
220 /*
221 * Inode flags
222 */
223 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
224 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
225 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
226 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
227 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
228 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
229 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
230 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
231 /* Reserved for compression usage... */
232 #define EXT4_DIRTY_FL 0x00000100
233 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
234 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
235 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
236 /* End compression flags --- maybe not all used */
237 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
238 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
239 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
240 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
241 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
242 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
243 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
244 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
245 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
246 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
247
248 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
249 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
250
251 /*
252 * Inode dynamic state flags
253 */
254 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
255 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
256 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
257 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
258
259 /* Used to pass group descriptor data when online resize is done */
260 struct ext4_new_group_input {
261 __u32 group; /* Group number for this data */
262 __u64 block_bitmap; /* Absolute block number of block bitmap */
263 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
264 __u64 inode_table; /* Absolute block number of inode table start */
265 __u32 blocks_count; /* Total number of blocks in this group */
266 __u16 reserved_blocks; /* Number of reserved blocks in this group */
267 __u16 unused;
268 };
269
270 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
271 struct ext4_new_group_data {
272 __u32 group;
273 __u64 block_bitmap;
274 __u64 inode_bitmap;
275 __u64 inode_table;
276 __u32 blocks_count;
277 __u16 reserved_blocks;
278 __u16 unused;
279 __u32 free_blocks_count;
280 };
281
282 /*
283 * Following is used by preallocation code to tell get_blocks() that we
284 * want uninitialzed extents.
285 */
286 #define EXT4_CREATE_UNINITIALIZED_EXT 2
287
288 /*
289 * ioctl commands
290 */
291 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
292 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
293 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
294 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
295 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
296 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
297 #ifdef CONFIG_JBD2_DEBUG
298 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
299 #endif
300 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
301 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
302 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
303 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
304 #define EXT4_IOC_MIGRATE _IO('f', 9)
305 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
306
307 /*
308 * ioctl commands in 32 bit emulation
309 */
310 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
311 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
312 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
313 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
314 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
315 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
316 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
317 #ifdef CONFIG_JBD2_DEBUG
318 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
319 #endif
320 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
321 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
322
323
324 /*
325 * Mount options
326 */
327 struct ext4_mount_options {
328 unsigned long s_mount_opt;
329 uid_t s_resuid;
330 gid_t s_resgid;
331 unsigned long s_commit_interval;
332 u32 s_min_batch_time, s_max_batch_time;
333 #ifdef CONFIG_QUOTA
334 int s_jquota_fmt;
335 char *s_qf_names[MAXQUOTAS];
336 #endif
337 };
338
339 /*
340 * Structure of an inode on the disk
341 */
342 struct ext4_inode {
343 __le16 i_mode; /* File mode */
344 __le16 i_uid; /* Low 16 bits of Owner Uid */
345 __le32 i_size_lo; /* Size in bytes */
346 __le32 i_atime; /* Access time */
347 __le32 i_ctime; /* Inode Change time */
348 __le32 i_mtime; /* Modification time */
349 __le32 i_dtime; /* Deletion Time */
350 __le16 i_gid; /* Low 16 bits of Group Id */
351 __le16 i_links_count; /* Links count */
352 __le32 i_blocks_lo; /* Blocks count */
353 __le32 i_flags; /* File flags */
354 union {
355 struct {
356 __le32 l_i_version;
357 } linux1;
358 struct {
359 __u32 h_i_translator;
360 } hurd1;
361 struct {
362 __u32 m_i_reserved1;
363 } masix1;
364 } osd1; /* OS dependent 1 */
365 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
366 __le32 i_generation; /* File version (for NFS) */
367 __le32 i_file_acl_lo; /* File ACL */
368 __le32 i_size_high;
369 __le32 i_obso_faddr; /* Obsoleted fragment address */
370 union {
371 struct {
372 __le16 l_i_blocks_high; /* were l_i_reserved1 */
373 __le16 l_i_file_acl_high;
374 __le16 l_i_uid_high; /* these 2 fields */
375 __le16 l_i_gid_high; /* were reserved2[0] */
376 __u32 l_i_reserved2;
377 } linux2;
378 struct {
379 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
380 __u16 h_i_mode_high;
381 __u16 h_i_uid_high;
382 __u16 h_i_gid_high;
383 __u32 h_i_author;
384 } hurd2;
385 struct {
386 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
387 __le16 m_i_file_acl_high;
388 __u32 m_i_reserved2[2];
389 } masix2;
390 } osd2; /* OS dependent 2 */
391 __le16 i_extra_isize;
392 __le16 i_pad1;
393 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
394 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
395 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
396 __le32 i_crtime; /* File Creation time */
397 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
398 __le32 i_version_hi; /* high 32 bits for 64-bit version */
399 };
400
401
402 #define EXT4_EPOCH_BITS 2
403 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
404 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
405
406 /*
407 * Extended fields will fit into an inode if the filesystem was formatted
408 * with large inodes (-I 256 or larger) and there are not currently any EAs
409 * consuming all of the available space. For new inodes we always reserve
410 * enough space for the kernel's known extended fields, but for inodes
411 * created with an old kernel this might not have been the case. None of
412 * the extended inode fields is critical for correct filesystem operation.
413 * This macro checks if a certain field fits in the inode. Note that
414 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
415 */
416 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
417 ((offsetof(typeof(*ext4_inode), field) + \
418 sizeof((ext4_inode)->field)) \
419 <= (EXT4_GOOD_OLD_INODE_SIZE + \
420 (einode)->i_extra_isize)) \
421
ext4_encode_extra_time(struct timespec * time)422 static inline __le32 ext4_encode_extra_time(struct timespec *time)
423 {
424 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
425 time->tv_sec >> 32 : 0) |
426 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
427 }
428
ext4_decode_extra_time(struct timespec * time,__le32 extra)429 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
430 {
431 if (sizeof(time->tv_sec) > 4)
432 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
433 << 32;
434 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
435 }
436
437 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
438 do { \
439 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
440 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
441 (raw_inode)->xtime ## _extra = \
442 ext4_encode_extra_time(&(inode)->xtime); \
443 } while (0)
444
445 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
446 do { \
447 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
448 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
449 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
450 (raw_inode)->xtime ## _extra = \
451 ext4_encode_extra_time(&(einode)->xtime); \
452 } while (0)
453
454 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
455 do { \
456 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
457 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
458 ext4_decode_extra_time(&(inode)->xtime, \
459 raw_inode->xtime ## _extra); \
460 } while (0)
461
462 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
463 do { \
464 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
465 (einode)->xtime.tv_sec = \
466 (signed)le32_to_cpu((raw_inode)->xtime); \
467 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
468 ext4_decode_extra_time(&(einode)->xtime, \
469 raw_inode->xtime ## _extra); \
470 } while (0)
471
472 #define i_disk_version osd1.linux1.l_i_version
473
474 #if defined(__KERNEL__) || defined(__linux__)
475 #define i_reserved1 osd1.linux1.l_i_reserved1
476 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
477 #define i_blocks_high osd2.linux2.l_i_blocks_high
478 #define i_uid_low i_uid
479 #define i_gid_low i_gid
480 #define i_uid_high osd2.linux2.l_i_uid_high
481 #define i_gid_high osd2.linux2.l_i_gid_high
482 #define i_reserved2 osd2.linux2.l_i_reserved2
483
484 #elif defined(__GNU__)
485
486 #define i_translator osd1.hurd1.h_i_translator
487 #define i_uid_high osd2.hurd2.h_i_uid_high
488 #define i_gid_high osd2.hurd2.h_i_gid_high
489 #define i_author osd2.hurd2.h_i_author
490
491 #elif defined(__masix__)
492
493 #define i_reserved1 osd1.masix1.m_i_reserved1
494 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
495 #define i_reserved2 osd2.masix2.m_i_reserved2
496
497 #endif /* defined(__KERNEL__) || defined(__linux__) */
498
499 /*
500 * File system states
501 */
502 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
503 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
504 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
505
506 /*
507 * Misc. filesystem flags
508 */
509 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
510 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
511 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
512
513 /*
514 * Mount flags
515 */
516 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
517 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
518 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
519 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
520 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
521 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
522 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
523 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
524 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
525 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
526 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
527 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
528 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
529 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
530 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
531 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
532 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
533 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
534 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
535 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
536 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
537 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
538 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
539 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
540 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
541 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
542 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
543 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
544
545 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
546 #ifndef _LINUX_EXT2_FS_H
547 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
548 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
549 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
550 EXT4_MOUNT_##opt)
551 #else
552 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
553 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
554 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
555 #endif
556
557 #define ext4_set_bit ext2_set_bit
558 #define ext4_set_bit_atomic ext2_set_bit_atomic
559 #define ext4_clear_bit ext2_clear_bit
560 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
561 #define ext4_test_bit ext2_test_bit
562 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
563 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
564 #define ext4_find_next_bit ext2_find_next_bit
565
566 /*
567 * Maximal mount counts between two filesystem checks
568 */
569 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
570 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
571
572 /*
573 * Behaviour when detecting errors
574 */
575 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
576 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
577 #define EXT4_ERRORS_PANIC 3 /* Panic */
578 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
579
580 /*
581 * Structure of the super block
582 */
583 struct ext4_super_block {
584 /*00*/ __le32 s_inodes_count; /* Inodes count */
585 __le32 s_blocks_count_lo; /* Blocks count */
586 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
587 __le32 s_free_blocks_count_lo; /* Free blocks count */
588 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
589 __le32 s_first_data_block; /* First Data Block */
590 __le32 s_log_block_size; /* Block size */
591 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
592 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
593 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
594 __le32 s_inodes_per_group; /* # Inodes per group */
595 __le32 s_mtime; /* Mount time */
596 /*30*/ __le32 s_wtime; /* Write time */
597 __le16 s_mnt_count; /* Mount count */
598 __le16 s_max_mnt_count; /* Maximal mount count */
599 __le16 s_magic; /* Magic signature */
600 __le16 s_state; /* File system state */
601 __le16 s_errors; /* Behaviour when detecting errors */
602 __le16 s_minor_rev_level; /* minor revision level */
603 /*40*/ __le32 s_lastcheck; /* time of last check */
604 __le32 s_checkinterval; /* max. time between checks */
605 __le32 s_creator_os; /* OS */
606 __le32 s_rev_level; /* Revision level */
607 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
608 __le16 s_def_resgid; /* Default gid for reserved blocks */
609 /*
610 * These fields are for EXT4_DYNAMIC_REV superblocks only.
611 *
612 * Note: the difference between the compatible feature set and
613 * the incompatible feature set is that if there is a bit set
614 * in the incompatible feature set that the kernel doesn't
615 * know about, it should refuse to mount the filesystem.
616 *
617 * e2fsck's requirements are more strict; if it doesn't know
618 * about a feature in either the compatible or incompatible
619 * feature set, it must abort and not try to meddle with
620 * things it doesn't understand...
621 */
622 __le32 s_first_ino; /* First non-reserved inode */
623 __le16 s_inode_size; /* size of inode structure */
624 __le16 s_block_group_nr; /* block group # of this superblock */
625 __le32 s_feature_compat; /* compatible feature set */
626 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
627 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
628 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
629 /*78*/ char s_volume_name[16]; /* volume name */
630 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
631 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
632 /*
633 * Performance hints. Directory preallocation should only
634 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
635 */
636 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
637 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
638 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
639 /*
640 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
641 */
642 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
643 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
644 __le32 s_journal_dev; /* device number of journal file */
645 __le32 s_last_orphan; /* start of list of inodes to delete */
646 __le32 s_hash_seed[4]; /* HTREE hash seed */
647 __u8 s_def_hash_version; /* Default hash version to use */
648 __u8 s_reserved_char_pad;
649 __le16 s_desc_size; /* size of group descriptor */
650 /*100*/ __le32 s_default_mount_opts;
651 __le32 s_first_meta_bg; /* First metablock block group */
652 __le32 s_mkfs_time; /* When the filesystem was created */
653 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
654 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
655 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
656 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
657 __le32 s_free_blocks_count_hi; /* Free blocks count */
658 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
659 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
660 __le32 s_flags; /* Miscellaneous flags */
661 __le16 s_raid_stride; /* RAID stride */
662 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
663 __le64 s_mmp_block; /* Block for multi-mount protection */
664 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
665 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
666 __u8 s_reserved_char_pad2;
667 __le16 s_reserved_pad;
668 __u32 s_reserved[162]; /* Padding to the end of the block */
669 };
670
671 #ifdef __KERNEL__
EXT4_SB(struct super_block * sb)672 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
673 {
674 return sb->s_fs_info;
675 }
EXT4_I(struct inode * inode)676 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
677 {
678 return container_of(inode, struct ext4_inode_info, vfs_inode);
679 }
680
ext4_current_time(struct inode * inode)681 static inline struct timespec ext4_current_time(struct inode *inode)
682 {
683 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
684 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
685 }
686
687
ext4_valid_inum(struct super_block * sb,unsigned long ino)688 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
689 {
690 return ino == EXT4_ROOT_INO ||
691 ino == EXT4_JOURNAL_INO ||
692 ino == EXT4_RESIZE_INO ||
693 (ino >= EXT4_FIRST_INO(sb) &&
694 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
695 }
696 #else
697 /* Assume that user mode programs are passing in an ext4fs superblock, not
698 * a kernel struct super_block. This will allow us to call the feature-test
699 * macros from user land. */
700 #define EXT4_SB(sb) (sb)
701 #endif
702
703 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
704
705 /*
706 * Codes for operating systems
707 */
708 #define EXT4_OS_LINUX 0
709 #define EXT4_OS_HURD 1
710 #define EXT4_OS_MASIX 2
711 #define EXT4_OS_FREEBSD 3
712 #define EXT4_OS_LITES 4
713
714 /*
715 * Revision levels
716 */
717 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
718 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
719
720 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
721 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
722
723 #define EXT4_GOOD_OLD_INODE_SIZE 128
724
725 /*
726 * Feature set definitions
727 */
728
729 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
730 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
731 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
732 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
733 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
734 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
735 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
736 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
737 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
738 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
739 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
740 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
741 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
742 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
743 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
744 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
745 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
746 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
747
748 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
749 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
750 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
751 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
752 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
753 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
754
755 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
756 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
757 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
758 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
759 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
760 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
761 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
762
763 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
764 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
765 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
766 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
767 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
768 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
769 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
770 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
771 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
772
773 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
774 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
775 EXT4_FEATURE_INCOMPAT_RECOVER| \
776 EXT4_FEATURE_INCOMPAT_META_BG| \
777 EXT4_FEATURE_INCOMPAT_EXTENTS| \
778 EXT4_FEATURE_INCOMPAT_64BIT| \
779 EXT4_FEATURE_INCOMPAT_FLEX_BG)
780 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
781 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
782 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
783 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
784 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
785 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
786 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
787
788 /*
789 * Default values for user and/or group using reserved blocks
790 */
791 #define EXT4_DEF_RESUID 0
792 #define EXT4_DEF_RESGID 0
793
794 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
795
796 /*
797 * Default mount options
798 */
799 #define EXT4_DEFM_DEBUG 0x0001
800 #define EXT4_DEFM_BSDGROUPS 0x0002
801 #define EXT4_DEFM_XATTR_USER 0x0004
802 #define EXT4_DEFM_ACL 0x0008
803 #define EXT4_DEFM_UID16 0x0010
804 #define EXT4_DEFM_JMODE 0x0060
805 #define EXT4_DEFM_JMODE_DATA 0x0020
806 #define EXT4_DEFM_JMODE_ORDERED 0x0040
807 #define EXT4_DEFM_JMODE_WBACK 0x0060
808
809 /*
810 * Default journal batch times
811 */
812 #define EXT4_DEF_MIN_BATCH_TIME 0
813 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
814
815 /*
816 * Structure of a directory entry
817 */
818 #define EXT4_NAME_LEN 255
819
820 struct ext4_dir_entry {
821 __le32 inode; /* Inode number */
822 __le16 rec_len; /* Directory entry length */
823 __le16 name_len; /* Name length */
824 char name[EXT4_NAME_LEN]; /* File name */
825 };
826
827 /*
828 * The new version of the directory entry. Since EXT4 structures are
829 * stored in intel byte order, and the name_len field could never be
830 * bigger than 255 chars, it's safe to reclaim the extra byte for the
831 * file_type field.
832 */
833 struct ext4_dir_entry_2 {
834 __le32 inode; /* Inode number */
835 __le16 rec_len; /* Directory entry length */
836 __u8 name_len; /* Name length */
837 __u8 file_type;
838 char name[EXT4_NAME_LEN]; /* File name */
839 };
840
841 /*
842 * Ext4 directory file types. Only the low 3 bits are used. The
843 * other bits are reserved for now.
844 */
845 #define EXT4_FT_UNKNOWN 0
846 #define EXT4_FT_REG_FILE 1
847 #define EXT4_FT_DIR 2
848 #define EXT4_FT_CHRDEV 3
849 #define EXT4_FT_BLKDEV 4
850 #define EXT4_FT_FIFO 5
851 #define EXT4_FT_SOCK 6
852 #define EXT4_FT_SYMLINK 7
853
854 #define EXT4_FT_MAX 8
855
856 /*
857 * EXT4_DIR_PAD defines the directory entries boundaries
858 *
859 * NOTE: It must be a multiple of 4
860 */
861 #define EXT4_DIR_PAD 4
862 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
863 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
864 ~EXT4_DIR_ROUND)
865 #define EXT4_MAX_REC_LEN ((1<<16)-1)
866
ext4_rec_len_from_disk(__le16 dlen)867 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
868 {
869 unsigned len = le16_to_cpu(dlen);
870
871 if (len == EXT4_MAX_REC_LEN || len == 0)
872 return 1 << 16;
873 return len;
874 }
875
ext4_rec_len_to_disk(unsigned len)876 static inline __le16 ext4_rec_len_to_disk(unsigned len)
877 {
878 if (len == (1 << 16))
879 return cpu_to_le16(EXT4_MAX_REC_LEN);
880 else if (len > (1 << 16))
881 BUG();
882 return cpu_to_le16(len);
883 }
884
885 /*
886 * Hash Tree Directory indexing
887 * (c) Daniel Phillips, 2001
888 */
889
890 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
891 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
892 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
893 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
894 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
895
896 /* Legal values for the dx_root hash_version field: */
897
898 #define DX_HASH_LEGACY 0
899 #define DX_HASH_HALF_MD4 1
900 #define DX_HASH_TEA 2
901 #define DX_HASH_LEGACY_UNSIGNED 3
902 #define DX_HASH_HALF_MD4_UNSIGNED 4
903 #define DX_HASH_TEA_UNSIGNED 5
904
905 #ifdef __KERNEL__
906
907 /* hash info structure used by the directory hash */
908 struct dx_hash_info
909 {
910 u32 hash;
911 u32 minor_hash;
912 int hash_version;
913 u32 *seed;
914 };
915
916 #define EXT4_HTREE_EOF 0x7fffffff
917
918 /*
919 * Control parameters used by ext4_htree_next_block
920 */
921 #define HASH_NB_ALWAYS 1
922
923
924 /*
925 * Describe an inode's exact location on disk and in memory
926 */
927 struct ext4_iloc
928 {
929 struct buffer_head *bh;
930 unsigned long offset;
931 ext4_group_t block_group;
932 };
933
ext4_raw_inode(struct ext4_iloc * iloc)934 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
935 {
936 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
937 }
938
939 /*
940 * This structure is stuffed into the struct file's private_data field
941 * for directories. It is where we put information so that we can do
942 * readdir operations in hash tree order.
943 */
944 struct dir_private_info {
945 struct rb_root root;
946 struct rb_node *curr_node;
947 struct fname *extra_fname;
948 loff_t last_pos;
949 __u32 curr_hash;
950 __u32 curr_minor_hash;
951 __u32 next_hash;
952 };
953
954 /* calculate the first block number of the group */
955 static inline ext4_fsblk_t
ext4_group_first_block_no(struct super_block * sb,ext4_group_t group_no)956 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
957 {
958 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
959 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
960 }
961
962 /*
963 * Special error return code only used by dx_probe() and its callers.
964 */
965 #define ERR_BAD_DX_DIR -75000
966
967 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
968 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
969
970 extern struct proc_dir_entry *ext4_proc_root;
971
972 #ifdef CONFIG_PROC_FS
973 extern const struct file_operations ext4_ui_proc_fops;
974
975 #define EXT4_PROC_HANDLER(name, var) \
976 do { \
977 proc = proc_create_data(name, mode, sbi->s_proc, \
978 &ext4_ui_proc_fops, &sbi->s_##var); \
979 if (proc == NULL) { \
980 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
981 goto err_out; \
982 } \
983 } while (0)
984 #else
985 #define EXT4_PROC_HANDLER(name, var)
986 #endif
987
988 /*
989 * Function prototypes
990 */
991
992 /*
993 * Ok, these declarations are also in <linux/kernel.h> but none of the
994 * ext4 source programs needs to include it so they are duplicated here.
995 */
996 # define NORET_TYPE /**/
997 # define ATTRIB_NORET __attribute__((noreturn))
998 # define NORET_AND noreturn,
999
1000 /* bitmap.c */
1001 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1002
1003 /* balloc.c */
1004 extern unsigned int ext4_block_group(struct super_block *sb,
1005 ext4_fsblk_t blocknr);
1006 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1007 ext4_fsblk_t blocknr);
1008 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1009 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1010 ext4_group_t group);
1011 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1012 ext4_fsblk_t goal, unsigned long *count, int *errp);
1013 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1014 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1015 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1016 ext4_fsblk_t block, unsigned long count, int metadata);
1017 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1018 ext4_fsblk_t block, unsigned long count);
1019 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1020 extern void ext4_check_blocks_bitmap(struct super_block *);
1021 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1022 ext4_group_t block_group,
1023 struct buffer_head ** bh);
1024 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1025
1026 /* dir.c */
1027 extern int ext4_check_dir_entry(const char *, struct inode *,
1028 struct ext4_dir_entry_2 *,
1029 struct buffer_head *, unsigned int);
1030 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1031 __u32 minor_hash,
1032 struct ext4_dir_entry_2 *dirent);
1033 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1034
1035 /* fsync.c */
1036 extern int ext4_sync_file(struct file *, struct dentry *, int);
1037
1038 /* hash.c */
1039 extern int ext4fs_dirhash(const char *name, int len, struct
1040 dx_hash_info *hinfo);
1041
1042 /* ialloc.c */
1043 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1044 extern void ext4_free_inode(handle_t *, struct inode *);
1045 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1046 extern unsigned long ext4_count_free_inodes(struct super_block *);
1047 extern unsigned long ext4_count_dirs(struct super_block *);
1048 extern void ext4_check_inodes_bitmap(struct super_block *);
1049
1050 /* mballoc.c */
1051 extern long ext4_mb_stats;
1052 extern long ext4_mb_max_to_scan;
1053 extern int ext4_mb_init(struct super_block *, int);
1054 extern int ext4_mb_release(struct super_block *);
1055 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1056 struct ext4_allocation_request *, int *);
1057 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1058 extern void ext4_discard_preallocations(struct inode *);
1059 extern int __init init_ext4_mballoc(void);
1060 extern void exit_ext4_mballoc(void);
1061 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1062 unsigned long, unsigned long, int, unsigned long *);
1063 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1064 ext4_group_t i, struct ext4_group_desc *desc);
1065 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1066 ext4_grpblk_t add);
1067 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1068 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1069 ext4_group_t, int);
1070 /* inode.c */
1071 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1072 struct buffer_head *bh, ext4_fsblk_t blocknr);
1073 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1074 ext4_lblk_t, int, int *);
1075 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1076 ext4_lblk_t, int, int *);
1077 int ext4_get_block(struct inode *inode, sector_t iblock,
1078 struct buffer_head *bh_result, int create);
1079
1080 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1081 extern int ext4_write_inode(struct inode *, int);
1082 extern int ext4_setattr(struct dentry *, struct iattr *);
1083 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1084 struct kstat *stat);
1085 extern void ext4_delete_inode(struct inode *);
1086 extern int ext4_sync_inode(handle_t *, struct inode *);
1087 extern void ext4_dirty_inode(struct inode *);
1088 extern int ext4_change_inode_journal_flag(struct inode *, int);
1089 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1090 extern int ext4_can_truncate(struct inode *inode);
1091 extern void ext4_truncate(struct inode *);
1092 extern void ext4_set_inode_flags(struct inode *);
1093 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1094 extern void ext4_set_aops(struct inode *inode);
1095 extern int ext4_writepage_trans_blocks(struct inode *);
1096 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1097 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1098 extern int ext4_block_truncate_page(handle_t *handle,
1099 struct address_space *mapping, loff_t from);
1100 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1101
1102 /* ioctl.c */
1103 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1104 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1105
1106 /* migrate.c */
1107 extern int ext4_ext_migrate(struct inode *);
1108 /* namei.c */
1109 extern int ext4_orphan_add(handle_t *, struct inode *);
1110 extern int ext4_orphan_del(handle_t *, struct inode *);
1111 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1112 __u32 start_minor_hash, __u32 *next_hash);
1113
1114 /* resize.c */
1115 extern int ext4_group_add(struct super_block *sb,
1116 struct ext4_new_group_data *input);
1117 extern int ext4_group_extend(struct super_block *sb,
1118 struct ext4_super_block *es,
1119 ext4_fsblk_t n_blocks_count);
1120
1121 /* super.c */
1122 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1123 __attribute__ ((format (printf, 3, 4)));
1124 extern void __ext4_std_error(struct super_block *, const char *, int);
1125 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1126 __attribute__ ((format (printf, 3, 4)));
1127 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1128 __attribute__ ((format (printf, 3, 4)));
1129 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1130 const char *, const char *, ...)
1131 __attribute__ ((format (printf, 4, 5)));
1132 extern void ext4_update_dynamic_rev(struct super_block *sb);
1133 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1134 __u32 compat);
1135 extern int ext4_update_rocompat_feature(handle_t *handle,
1136 struct super_block *sb, __u32 rocompat);
1137 extern int ext4_update_incompat_feature(handle_t *handle,
1138 struct super_block *sb, __u32 incompat);
1139 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1140 struct ext4_group_desc *bg);
1141 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1142 struct ext4_group_desc *bg);
1143 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1144 struct ext4_group_desc *bg);
1145 extern __u32 ext4_free_blks_count(struct super_block *sb,
1146 struct ext4_group_desc *bg);
1147 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1148 struct ext4_group_desc *bg);
1149 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1150 struct ext4_group_desc *bg);
1151 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1152 struct ext4_group_desc *bg);
1153 extern void ext4_block_bitmap_set(struct super_block *sb,
1154 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1155 extern void ext4_inode_bitmap_set(struct super_block *sb,
1156 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1157 extern void ext4_inode_table_set(struct super_block *sb,
1158 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1159 extern void ext4_free_blks_set(struct super_block *sb,
1160 struct ext4_group_desc *bg, __u32 count);
1161 extern void ext4_free_inodes_set(struct super_block *sb,
1162 struct ext4_group_desc *bg, __u32 count);
1163 extern void ext4_used_dirs_set(struct super_block *sb,
1164 struct ext4_group_desc *bg, __u32 count);
1165 extern void ext4_itable_unused_set(struct super_block *sb,
1166 struct ext4_group_desc *bg, __u32 count);
1167
ext4_blocks_count(struct ext4_super_block * es)1168 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1169 {
1170 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1171 le32_to_cpu(es->s_blocks_count_lo);
1172 }
1173
ext4_r_blocks_count(struct ext4_super_block * es)1174 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1175 {
1176 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1177 le32_to_cpu(es->s_r_blocks_count_lo);
1178 }
1179
ext4_free_blocks_count(struct ext4_super_block * es)1180 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1181 {
1182 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1183 le32_to_cpu(es->s_free_blocks_count_lo);
1184 }
1185
ext4_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)1186 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1187 ext4_fsblk_t blk)
1188 {
1189 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1190 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1191 }
1192
ext4_free_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)1193 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1194 ext4_fsblk_t blk)
1195 {
1196 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1197 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1198 }
1199
ext4_r_blocks_count_set(struct ext4_super_block * es,ext4_fsblk_t blk)1200 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1201 ext4_fsblk_t blk)
1202 {
1203 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1204 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1205 }
1206
ext4_isize(struct ext4_inode * raw_inode)1207 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1208 {
1209 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1210 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1211 le32_to_cpu(raw_inode->i_size_lo);
1212 else
1213 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1214 }
1215
ext4_isize_set(struct ext4_inode * raw_inode,loff_t i_size)1216 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1217 {
1218 raw_inode->i_size_lo = cpu_to_le32(i_size);
1219 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1220 }
1221
1222 static inline
ext4_get_group_info(struct super_block * sb,ext4_group_t group)1223 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1224 ext4_group_t group)
1225 {
1226 struct ext4_group_info ***grp_info;
1227 long indexv, indexh;
1228 grp_info = EXT4_SB(sb)->s_group_info;
1229 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1230 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1231 return grp_info[indexv][indexh];
1232 }
1233
1234
ext4_flex_group(struct ext4_sb_info * sbi,ext4_group_t block_group)1235 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1236 ext4_group_t block_group)
1237 {
1238 return block_group >> sbi->s_log_groups_per_flex;
1239 }
1240
ext4_flex_bg_size(struct ext4_sb_info * sbi)1241 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1242 {
1243 return 1 << sbi->s_log_groups_per_flex;
1244 }
1245
1246 #define ext4_std_error(sb, errno) \
1247 do { \
1248 if ((errno)) \
1249 __ext4_std_error((sb), __func__, (errno)); \
1250 } while (0)
1251
1252 #ifdef CONFIG_SMP
1253 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1254 * counters. So we need to make sure we have free blocks more
1255 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1256 */
1257 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1258 #else
1259 #define EXT4_FREEBLOCKS_WATERMARK 0
1260 #endif
1261
ext4_update_i_disksize(struct inode * inode,loff_t newsize)1262 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1263 {
1264 /*
1265 * XXX: replace with spinlock if seen contended -bzzz
1266 */
1267 down_write(&EXT4_I(inode)->i_data_sem);
1268 if (newsize > EXT4_I(inode)->i_disksize)
1269 EXT4_I(inode)->i_disksize = newsize;
1270 up_write(&EXT4_I(inode)->i_data_sem);
1271 return ;
1272 }
1273
1274 struct ext4_group_info {
1275 unsigned long bb_state;
1276 struct rb_root bb_free_root;
1277 unsigned short bb_first_free;
1278 unsigned short bb_free;
1279 unsigned short bb_fragments;
1280 struct list_head bb_prealloc_list;
1281 #ifdef DOUBLE_CHECK
1282 void *bb_bitmap;
1283 #endif
1284 struct rw_semaphore alloc_sem;
1285 unsigned short bb_counters[];
1286 };
1287
1288 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1289 #define EXT4_GROUP_INFO_LOCKED_BIT 1
1290
1291 #define EXT4_MB_GRP_NEED_INIT(grp) \
1292 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1293
ext4_lock_group(struct super_block * sb,ext4_group_t group)1294 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1295 {
1296 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1297
1298 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1299 }
1300
ext4_unlock_group(struct super_block * sb,ext4_group_t group)1301 static inline void ext4_unlock_group(struct super_block *sb,
1302 ext4_group_t group)
1303 {
1304 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1305
1306 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1307 }
1308
ext4_is_group_locked(struct super_block * sb,ext4_group_t group)1309 static inline int ext4_is_group_locked(struct super_block *sb,
1310 ext4_group_t group)
1311 {
1312 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1313
1314 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1315 &(grinfo->bb_state));
1316 }
1317
1318 /*
1319 * Inodes and files operations
1320 */
1321
1322 /* dir.c */
1323 extern const struct file_operations ext4_dir_operations;
1324
1325 /* file.c */
1326 extern const struct inode_operations ext4_file_inode_operations;
1327 extern const struct file_operations ext4_file_operations;
1328
1329 /* namei.c */
1330 extern const struct inode_operations ext4_dir_inode_operations;
1331 extern const struct inode_operations ext4_special_inode_operations;
1332
1333 /* symlink.c */
1334 extern const struct inode_operations ext4_symlink_inode_operations;
1335 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1336
1337 /* extents.c */
1338 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1339 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1340 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1341 int chunk);
1342 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1343 ext4_lblk_t iblock, unsigned int max_blocks,
1344 struct buffer_head *bh_result,
1345 int create, int extend_disksize);
1346 extern void ext4_ext_truncate(struct inode *);
1347 extern void ext4_ext_init(struct super_block *);
1348 extern void ext4_ext_release(struct super_block *);
1349 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1350 loff_t len);
1351 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1352 sector_t block, unsigned int max_blocks,
1353 struct buffer_head *bh, int create,
1354 int extend_disksize, int flag);
1355 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1356 __u64 start, __u64 len);
1357
1358 /*
1359 * Add new method to test wether block and inode bitmaps are properly
1360 * initialized. With uninit_bg reading the block from disk is not enough
1361 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1362 */
1363 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1364
bitmap_uptodate(struct buffer_head * bh)1365 static inline int bitmap_uptodate(struct buffer_head *bh)
1366 {
1367 return (buffer_uptodate(bh) &&
1368 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1369 }
set_bitmap_uptodate(struct buffer_head * bh)1370 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1371 {
1372 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1373 }
1374
1375 #endif /* __KERNEL__ */
1376
1377 #endif /* _EXT4_H */
1378