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Merge branch 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
[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 <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32
33 /*
34 * The fourth extended filesystem constants/structures
35 */
36
37 /*
38 * Define EXT4FS_DEBUG to produce debug messages
39 */
40 #undef EXT4FS_DEBUG
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 /* data type for block offset of block group */
57 typedef int ext4_grpblk_t;
58
59 /* data type for filesystem-wide blocks number */
60 typedef unsigned long long ext4_fsblk_t;
61
62 /* data type for file logical block number */
63 typedef __u32 ext4_lblk_t;
64
65 /* data type for block group number */
66 typedef unsigned int ext4_group_t;
67
68
69 /* prefer goal again. length */
70 #define EXT4_MB_HINT_MERGE 1
71 /* blocks already reserved */
72 #define EXT4_MB_HINT_RESERVED 2
73 /* metadata is being allocated */
74 #define EXT4_MB_HINT_METADATA 4
75 /* first blocks in the file */
76 #define EXT4_MB_HINT_FIRST 8
77 /* search for the best chunk */
78 #define EXT4_MB_HINT_BEST 16
79 /* data is being allocated */
80 #define EXT4_MB_HINT_DATA 32
81 /* don't preallocate (for tails) */
82 #define EXT4_MB_HINT_NOPREALLOC 64
83 /* allocate for locality group */
84 #define EXT4_MB_HINT_GROUP_ALLOC 128
85 /* allocate goal blocks or none */
86 #define EXT4_MB_HINT_GOAL_ONLY 256
87 /* goal is meaningful */
88 #define EXT4_MB_HINT_TRY_GOAL 512
89 /* blocks already pre-reserved by delayed allocation */
90 #define EXT4_MB_DELALLOC_RESERVED 1024
91
92
93 struct ext4_allocation_request {
94 /* target inode for block we're allocating */
95 struct inode *inode;
96 /* logical block in target inode */
97 ext4_lblk_t logical;
98 /* phys. target (a hint) */
99 ext4_fsblk_t goal;
100 /* the closest logical allocated block to the left */
101 ext4_lblk_t lleft;
102 /* phys. block for ^^^ */
103 ext4_fsblk_t pleft;
104 /* the closest logical allocated block to the right */
105 ext4_lblk_t lright;
106 /* phys. block for ^^^ */
107 ext4_fsblk_t pright;
108 /* how many blocks we want to allocate */
109 unsigned int len;
110 /* flags. see above EXT4_MB_HINT_* */
111 unsigned int flags;
112 };
113
114 /*
115 * Special inodes numbers
116 */
117 #define EXT4_BAD_INO 1 /* Bad blocks inode */
118 #define EXT4_ROOT_INO 2 /* Root inode */
119 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
120 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
121 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
122 #define EXT4_JOURNAL_INO 8 /* Journal inode */
123
124 /* First non-reserved inode for old ext4 filesystems */
125 #define EXT4_GOOD_OLD_FIRST_INO 11
126
127 /*
128 * Maximal count of links to a file
129 */
130 #define EXT4_LINK_MAX 65000
131
132 /*
133 * Macro-instructions used to manage several block sizes
134 */
135 #define EXT4_MIN_BLOCK_SIZE 1024
136 #define EXT4_MAX_BLOCK_SIZE 65536
137 #define EXT4_MIN_BLOCK_LOG_SIZE 10
138 #ifdef __KERNEL__
139 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
140 #else
141 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
142 #endif
143 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
144 #ifdef __KERNEL__
145 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
146 #else
147 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
148 #endif
149 #ifdef __KERNEL__
150 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
151 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
152 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
153 #else
154 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
155 EXT4_GOOD_OLD_INODE_SIZE : \
156 (s)->s_inode_size)
157 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
158 EXT4_GOOD_OLD_FIRST_INO : \
159 (s)->s_first_ino)
160 #endif
161 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
162
163 /*
164 * Structure of a blocks group descriptor
165 */
166 struct ext4_group_desc
167 {
168 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
169 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
170 __le32 bg_inode_table_lo; /* Inodes table block */
171 __le16 bg_free_blocks_count_lo;/* Free blocks count */
172 __le16 bg_free_inodes_count_lo;/* Free inodes count */
173 __le16 bg_used_dirs_count_lo; /* Directories count */
174 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
175 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
176 __le16 bg_itable_unused_lo; /* Unused inodes count */
177 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
178 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
179 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
180 __le32 bg_inode_table_hi; /* Inodes table block MSB */
181 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
182 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
183 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
184 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
185 __u32 bg_reserved2[3];
186 };
187
188 /*
189 * Structure of a flex block group info
190 */
191
192 struct flex_groups {
193 atomic_t free_inodes;
194 atomic_t free_blocks;
195 atomic_t used_dirs;
196 };
197
198 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
199 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
200 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
201
202 /*
203 * Macro-instructions used to manage group descriptors
204 */
205 #define EXT4_MIN_DESC_SIZE 32
206 #define EXT4_MIN_DESC_SIZE_64BIT 64
207 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
208 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
209 #ifdef __KERNEL__
210 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
211 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
212 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
213 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
214 #else
215 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
216 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
217 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
218 #endif
219
220 /*
221 * Constants relative to the data blocks
222 */
223 #define EXT4_NDIR_BLOCKS 12
224 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
225 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
226 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
227 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
228
229 /*
230 * Inode flags
231 */
232 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
233 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
234 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
235 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
236 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
237 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
238 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
239 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
240 /* Reserved for compression usage... */
241 #define EXT4_DIRTY_FL 0x00000100
242 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
243 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
244 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
245 /* End compression flags --- maybe not all used */
246 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
247 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
248 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
249 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
250 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
251 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
252 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
253 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
254 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
255 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
256
257 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
258 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
259
260 /* Flags that should be inherited by new inodes from their parent. */
261 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
262 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
263 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
264 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
265 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
266
267 /* Flags that are appropriate for regular files (all but dir-specific ones). */
268 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
269
270 /* Flags that are appropriate for non-directories/regular files. */
271 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
272
273 /* Mask out flags that are inappropriate for the given type of inode. */
274 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
275 {
276 if (S_ISDIR(mode))
277 return flags;
278 else if (S_ISREG(mode))
279 return flags & EXT4_REG_FLMASK;
280 else
281 return flags & EXT4_OTHER_FLMASK;
282 }
283
284 /*
285 * Inode dynamic state flags
286 */
287 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
288 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
289 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
290 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
291 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
292
293 /* Used to pass group descriptor data when online resize is done */
294 struct ext4_new_group_input {
295 __u32 group; /* Group number for this data */
296 __u64 block_bitmap; /* Absolute block number of block bitmap */
297 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
298 __u64 inode_table; /* Absolute block number of inode table start */
299 __u32 blocks_count; /* Total number of blocks in this group */
300 __u16 reserved_blocks; /* Number of reserved blocks in this group */
301 __u16 unused;
302 };
303
304 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
305 struct ext4_new_group_data {
306 __u32 group;
307 __u64 block_bitmap;
308 __u64 inode_bitmap;
309 __u64 inode_table;
310 __u32 blocks_count;
311 __u16 reserved_blocks;
312 __u16 unused;
313 __u32 free_blocks_count;
314 };
315
316 /*
317 * Flags used by ext4_get_blocks()
318 */
319 /* Allocate any needed blocks and/or convert an unitialized
320 extent to be an initialized ext4 */
321 #define EXT4_GET_BLOCKS_CREATE 0x0001
322 /* Request the creation of an unitialized extent */
323 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
324 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
325 EXT4_GET_BLOCKS_CREATE)
326 /* Caller is from the delayed allocation writeout path,
327 so set the magic i_delalloc_reserve_flag after taking the
328 inode allocation semaphore for */
329 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
330 /* Call ext4_da_update_reserve_space() after successfully
331 allocating the blocks */
332 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
333
334
335 /*
336 * ioctl commands
337 */
338 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
339 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
340 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
341 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
342 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
343 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
344 #ifdef CONFIG_JBD2_DEBUG
345 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
346 #endif
347 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
348 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
349 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
350 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
351 #define EXT4_IOC_MIGRATE _IO('f', 9)
352 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
353 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
354 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
355 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
356
357 /*
358 * ioctl commands in 32 bit emulation
359 */
360 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
361 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
362 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
363 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
364 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
365 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
366 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
367 #ifdef CONFIG_JBD2_DEBUG
368 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
369 #endif
370 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
371 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
372
373
374 /*
375 * Mount options
376 */
377 struct ext4_mount_options {
378 unsigned long s_mount_opt;
379 uid_t s_resuid;
380 gid_t s_resgid;
381 unsigned long s_commit_interval;
382 u32 s_min_batch_time, s_max_batch_time;
383 #ifdef CONFIG_QUOTA
384 int s_jquota_fmt;
385 char *s_qf_names[MAXQUOTAS];
386 #endif
387 };
388
389 /*
390 * Structure of an inode on the disk
391 */
392 struct ext4_inode {
393 __le16 i_mode; /* File mode */
394 __le16 i_uid; /* Low 16 bits of Owner Uid */
395 __le32 i_size_lo; /* Size in bytes */
396 __le32 i_atime; /* Access time */
397 __le32 i_ctime; /* Inode Change time */
398 __le32 i_mtime; /* Modification time */
399 __le32 i_dtime; /* Deletion Time */
400 __le16 i_gid; /* Low 16 bits of Group Id */
401 __le16 i_links_count; /* Links count */
402 __le32 i_blocks_lo; /* Blocks count */
403 __le32 i_flags; /* File flags */
404 union {
405 struct {
406 __le32 l_i_version;
407 } linux1;
408 struct {
409 __u32 h_i_translator;
410 } hurd1;
411 struct {
412 __u32 m_i_reserved1;
413 } masix1;
414 } osd1; /* OS dependent 1 */
415 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
416 __le32 i_generation; /* File version (for NFS) */
417 __le32 i_file_acl_lo; /* File ACL */
418 __le32 i_size_high;
419 __le32 i_obso_faddr; /* Obsoleted fragment address */
420 union {
421 struct {
422 __le16 l_i_blocks_high; /* were l_i_reserved1 */
423 __le16 l_i_file_acl_high;
424 __le16 l_i_uid_high; /* these 2 fields */
425 __le16 l_i_gid_high; /* were reserved2[0] */
426 __u32 l_i_reserved2;
427 } linux2;
428 struct {
429 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
430 __u16 h_i_mode_high;
431 __u16 h_i_uid_high;
432 __u16 h_i_gid_high;
433 __u32 h_i_author;
434 } hurd2;
435 struct {
436 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
437 __le16 m_i_file_acl_high;
438 __u32 m_i_reserved2[2];
439 } masix2;
440 } osd2; /* OS dependent 2 */
441 __le16 i_extra_isize;
442 __le16 i_pad1;
443 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
444 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
445 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
446 __le32 i_crtime; /* File Creation time */
447 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
448 __le32 i_version_hi; /* high 32 bits for 64-bit version */
449 };
450
451 struct move_extent {
452 __u32 reserved; /* should be zero */
453 __u32 donor_fd; /* donor file descriptor */
454 __u64 orig_start; /* logical start offset in block for orig */
455 __u64 donor_start; /* logical start offset in block for donor */
456 __u64 len; /* block length to be moved */
457 __u64 moved_len; /* moved block length */
458 };
459 #define MAX_DEFRAG_SIZE ((1UL<<31) - 1)
460
461 #define EXT4_EPOCH_BITS 2
462 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
463 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
464
465 /*
466 * Extended fields will fit into an inode if the filesystem was formatted
467 * with large inodes (-I 256 or larger) and there are not currently any EAs
468 * consuming all of the available space. For new inodes we always reserve
469 * enough space for the kernel's known extended fields, but for inodes
470 * created with an old kernel this might not have been the case. None of
471 * the extended inode fields is critical for correct filesystem operation.
472 * This macro checks if a certain field fits in the inode. Note that
473 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
474 */
475 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
476 ((offsetof(typeof(*ext4_inode), field) + \
477 sizeof((ext4_inode)->field)) \
478 <= (EXT4_GOOD_OLD_INODE_SIZE + \
479 (einode)->i_extra_isize)) \
480
481 static inline __le32 ext4_encode_extra_time(struct timespec *time)
482 {
483 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
484 time->tv_sec >> 32 : 0) |
485 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
486 }
487
488 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
489 {
490 if (sizeof(time->tv_sec) > 4)
491 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
492 << 32;
493 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
494 }
495
496 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
497 do { \
498 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
499 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
500 (raw_inode)->xtime ## _extra = \
501 ext4_encode_extra_time(&(inode)->xtime); \
502 } while (0)
503
504 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
505 do { \
506 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
507 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
508 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
509 (raw_inode)->xtime ## _extra = \
510 ext4_encode_extra_time(&(einode)->xtime); \
511 } while (0)
512
513 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
514 do { \
515 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
516 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
517 ext4_decode_extra_time(&(inode)->xtime, \
518 raw_inode->xtime ## _extra); \
519 } while (0)
520
521 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
522 do { \
523 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
524 (einode)->xtime.tv_sec = \
525 (signed)le32_to_cpu((raw_inode)->xtime); \
526 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
527 ext4_decode_extra_time(&(einode)->xtime, \
528 raw_inode->xtime ## _extra); \
529 } while (0)
530
531 #define i_disk_version osd1.linux1.l_i_version
532
533 #if defined(__KERNEL__) || defined(__linux__)
534 #define i_reserved1 osd1.linux1.l_i_reserved1
535 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
536 #define i_blocks_high osd2.linux2.l_i_blocks_high
537 #define i_uid_low i_uid
538 #define i_gid_low i_gid
539 #define i_uid_high osd2.linux2.l_i_uid_high
540 #define i_gid_high osd2.linux2.l_i_gid_high
541 #define i_reserved2 osd2.linux2.l_i_reserved2
542
543 #elif defined(__GNU__)
544
545 #define i_translator osd1.hurd1.h_i_translator
546 #define i_uid_high osd2.hurd2.h_i_uid_high
547 #define i_gid_high osd2.hurd2.h_i_gid_high
548 #define i_author osd2.hurd2.h_i_author
549
550 #elif defined(__masix__)
551
552 #define i_reserved1 osd1.masix1.m_i_reserved1
553 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
554 #define i_reserved2 osd2.masix2.m_i_reserved2
555
556 #endif /* defined(__KERNEL__) || defined(__linux__) */
557
558 /*
559 * storage for cached extent
560 */
561 struct ext4_ext_cache {
562 ext4_fsblk_t ec_start;
563 ext4_lblk_t ec_block;
564 __u32 ec_len; /* must be 32bit to return holes */
565 __u32 ec_type;
566 };
567
568 /*
569 * fourth extended file system inode data in memory
570 */
571 struct ext4_inode_info {
572 __le32 i_data[15]; /* unconverted */
573 __u32 i_flags;
574 ext4_fsblk_t i_file_acl;
575 __u32 i_dtime;
576
577 /*
578 * i_block_group is the number of the block group which contains
579 * this file's inode. Constant across the lifetime of the inode,
580 * it is ued for making block allocation decisions - we try to
581 * place a file's data blocks near its inode block, and new inodes
582 * near to their parent directory's inode.
583 */
584 ext4_group_t i_block_group;
585 __u32 i_state; /* Dynamic state flags for ext4 */
586
587 ext4_lblk_t i_dir_start_lookup;
588 #ifdef CONFIG_EXT4_FS_XATTR
589 /*
590 * Extended attributes can be read independently of the main file
591 * data. Taking i_mutex even when reading would cause contention
592 * between readers of EAs and writers of regular file data, so
593 * instead we synchronize on xattr_sem when reading or changing
594 * EAs.
595 */
596 struct rw_semaphore xattr_sem;
597 #endif
598 #ifdef CONFIG_EXT4_FS_POSIX_ACL
599 struct posix_acl *i_acl;
600 struct posix_acl *i_default_acl;
601 #endif
602
603 struct list_head i_orphan; /* unlinked but open inodes */
604
605 /*
606 * i_disksize keeps track of what the inode size is ON DISK, not
607 * in memory. During truncate, i_size is set to the new size by
608 * the VFS prior to calling ext4_truncate(), but the filesystem won't
609 * set i_disksize to 0 until the truncate is actually under way.
610 *
611 * The intent is that i_disksize always represents the blocks which
612 * are used by this file. This allows recovery to restart truncate
613 * on orphans if we crash during truncate. We actually write i_disksize
614 * into the on-disk inode when writing inodes out, instead of i_size.
615 *
616 * The only time when i_disksize and i_size may be different is when
617 * a truncate is in progress. The only things which change i_disksize
618 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
619 */
620 loff_t i_disksize;
621
622 /*
623 * i_data_sem is for serialising ext4_truncate() against
624 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
625 * data tree are chopped off during truncate. We can't do that in
626 * ext4 because whenever we perform intermediate commits during
627 * truncate, the inode and all the metadata blocks *must* be in a
628 * consistent state which allows truncation of the orphans to restart
629 * during recovery. Hence we must fix the get_block-vs-truncate race
630 * by other means, so we have i_data_sem.
631 */
632 struct rw_semaphore i_data_sem;
633 struct inode vfs_inode;
634 struct jbd2_inode jinode;
635
636 struct ext4_ext_cache i_cached_extent;
637 /*
638 * File creation time. Its function is same as that of
639 * struct timespec i_{a,c,m}time in the generic inode.
640 */
641 struct timespec i_crtime;
642
643 /* mballoc */
644 struct list_head i_prealloc_list;
645 spinlock_t i_prealloc_lock;
646
647 /* ialloc */
648 ext4_group_t i_last_alloc_group;
649
650 /* allocation reservation info for delalloc */
651 unsigned int i_reserved_data_blocks;
652 unsigned int i_reserved_meta_blocks;
653 unsigned int i_allocated_meta_blocks;
654 unsigned short i_delalloc_reserved_flag;
655
656 /* on-disk additional length */
657 __u16 i_extra_isize;
658
659 spinlock_t i_block_reservation_lock;
660 };
661
662 /*
663 * File system states
664 */
665 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
666 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
667 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
668
669 /*
670 * Misc. filesystem flags
671 */
672 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
673 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
674 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
675
676 /*
677 * Mount flags
678 */
679 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
680 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
681 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
682 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
683 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
684 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
685 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
686 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
687 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
688 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
689 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
690 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
691 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
692 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
693 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
694 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
695 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
696 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
697 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
698 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
699 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
700 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
701 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
702 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
703 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
704 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
705 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
706 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
707
708 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
709 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
710 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
711 EXT4_MOUNT_##opt)
712
713 #define ext4_set_bit ext2_set_bit
714 #define ext4_set_bit_atomic ext2_set_bit_atomic
715 #define ext4_clear_bit ext2_clear_bit
716 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
717 #define ext4_test_bit ext2_test_bit
718 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
719 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
720 #define ext4_find_next_bit ext2_find_next_bit
721
722 /*
723 * Maximal mount counts between two filesystem checks
724 */
725 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
726 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
727
728 /*
729 * Behaviour when detecting errors
730 */
731 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
732 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
733 #define EXT4_ERRORS_PANIC 3 /* Panic */
734 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
735
736 /*
737 * Structure of the super block
738 */
739 struct ext4_super_block {
740 /*00*/ __le32 s_inodes_count; /* Inodes count */
741 __le32 s_blocks_count_lo; /* Blocks count */
742 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
743 __le32 s_free_blocks_count_lo; /* Free blocks count */
744 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
745 __le32 s_first_data_block; /* First Data Block */
746 __le32 s_log_block_size; /* Block size */
747 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
748 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
749 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
750 __le32 s_inodes_per_group; /* # Inodes per group */
751 __le32 s_mtime; /* Mount time */
752 /*30*/ __le32 s_wtime; /* Write time */
753 __le16 s_mnt_count; /* Mount count */
754 __le16 s_max_mnt_count; /* Maximal mount count */
755 __le16 s_magic; /* Magic signature */
756 __le16 s_state; /* File system state */
757 __le16 s_errors; /* Behaviour when detecting errors */
758 __le16 s_minor_rev_level; /* minor revision level */
759 /*40*/ __le32 s_lastcheck; /* time of last check */
760 __le32 s_checkinterval; /* max. time between checks */
761 __le32 s_creator_os; /* OS */
762 __le32 s_rev_level; /* Revision level */
763 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
764 __le16 s_def_resgid; /* Default gid for reserved blocks */
765 /*
766 * These fields are for EXT4_DYNAMIC_REV superblocks only.
767 *
768 * Note: the difference between the compatible feature set and
769 * the incompatible feature set is that if there is a bit set
770 * in the incompatible feature set that the kernel doesn't
771 * know about, it should refuse to mount the filesystem.
772 *
773 * e2fsck's requirements are more strict; if it doesn't know
774 * about a feature in either the compatible or incompatible
775 * feature set, it must abort and not try to meddle with
776 * things it doesn't understand...
777 */
778 __le32 s_first_ino; /* First non-reserved inode */
779 __le16 s_inode_size; /* size of inode structure */
780 __le16 s_block_group_nr; /* block group # of this superblock */
781 __le32 s_feature_compat; /* compatible feature set */
782 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
783 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
784 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
785 /*78*/ char s_volume_name[16]; /* volume name */
786 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
787 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
788 /*
789 * Performance hints. Directory preallocation should only
790 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
791 */
792 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
793 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
794 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
795 /*
796 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
797 */
798 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
799 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
800 __le32 s_journal_dev; /* device number of journal file */
801 __le32 s_last_orphan; /* start of list of inodes to delete */
802 __le32 s_hash_seed[4]; /* HTREE hash seed */
803 __u8 s_def_hash_version; /* Default hash version to use */
804 __u8 s_reserved_char_pad;
805 __le16 s_desc_size; /* size of group descriptor */
806 /*100*/ __le32 s_default_mount_opts;
807 __le32 s_first_meta_bg; /* First metablock block group */
808 __le32 s_mkfs_time; /* When the filesystem was created */
809 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
810 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
811 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
812 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
813 __le32 s_free_blocks_count_hi; /* Free blocks count */
814 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
815 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
816 __le32 s_flags; /* Miscellaneous flags */
817 __le16 s_raid_stride; /* RAID stride */
818 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
819 __le64 s_mmp_block; /* Block for multi-mount protection */
820 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
821 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
822 __u8 s_reserved_char_pad2;
823 __le16 s_reserved_pad;
824 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
825 __u32 s_reserved[160]; /* Padding to the end of the block */
826 };
827
828 #ifdef __KERNEL__
829
830 /*
831 * run-time mount flags
832 */
833 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
834 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
835
836 /*
837 * fourth extended-fs super-block data in memory
838 */
839 struct ext4_sb_info {
840 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
841 unsigned long s_inodes_per_block;/* Number of inodes per block */
842 unsigned long s_blocks_per_group;/* Number of blocks in a group */
843 unsigned long s_inodes_per_group;/* Number of inodes in a group */
844 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
845 unsigned long s_gdb_count; /* Number of group descriptor blocks */
846 unsigned long s_desc_per_block; /* Number of group descriptors per block */
847 ext4_group_t s_groups_count; /* Number of groups in the fs */
848 unsigned long s_overhead_last; /* Last calculated overhead */
849 unsigned long s_blocks_last; /* Last seen block count */
850 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
851 struct buffer_head * s_sbh; /* Buffer containing the super block */
852 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
853 struct buffer_head **s_group_desc;
854 unsigned int s_mount_opt;
855 unsigned int s_mount_flags;
856 ext4_fsblk_t s_sb_block;
857 uid_t s_resuid;
858 gid_t s_resgid;
859 unsigned short s_mount_state;
860 unsigned short s_pad;
861 int s_addr_per_block_bits;
862 int s_desc_per_block_bits;
863 int s_inode_size;
864 int s_first_ino;
865 unsigned int s_inode_readahead_blks;
866 unsigned int s_inode_goal;
867 spinlock_t s_next_gen_lock;
868 u32 s_next_generation;
869 u32 s_hash_seed[4];
870 int s_def_hash_version;
871 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
872 struct percpu_counter s_freeblocks_counter;
873 struct percpu_counter s_freeinodes_counter;
874 struct percpu_counter s_dirs_counter;
875 struct percpu_counter s_dirtyblocks_counter;
876 struct blockgroup_lock *s_blockgroup_lock;
877 struct proc_dir_entry *s_proc;
878 struct kobject s_kobj;
879 struct completion s_kobj_unregister;
880
881 /* Journaling */
882 struct inode *s_journal_inode;
883 struct journal_s *s_journal;
884 struct list_head s_orphan;
885 struct mutex s_orphan_lock;
886 struct mutex s_resize_lock;
887 unsigned long s_commit_interval;
888 u32 s_max_batch_time;
889 u32 s_min_batch_time;
890 struct block_device *journal_bdev;
891 #ifdef CONFIG_JBD2_DEBUG
892 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
893 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
894 #endif
895 #ifdef CONFIG_QUOTA
896 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
897 int s_jquota_fmt; /* Format of quota to use */
898 #endif
899 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
900 struct rb_root system_blks;
901
902 #ifdef EXTENTS_STATS
903 /* ext4 extents stats */
904 unsigned long s_ext_min;
905 unsigned long s_ext_max;
906 unsigned long s_depth_max;
907 spinlock_t s_ext_stats_lock;
908 unsigned long s_ext_blocks;
909 unsigned long s_ext_extents;
910 #endif
911
912 /* for buddy allocator */
913 struct ext4_group_info ***s_group_info;
914 struct inode *s_buddy_cache;
915 long s_blocks_reserved;
916 spinlock_t s_reserve_lock;
917 spinlock_t s_md_lock;
918 tid_t s_last_transaction;
919 unsigned short *s_mb_offsets;
920 unsigned int *s_mb_maxs;
921
922 /* tunables */
923 unsigned long s_stripe;
924 unsigned int s_mb_stream_request;
925 unsigned int s_mb_max_to_scan;
926 unsigned int s_mb_min_to_scan;
927 unsigned int s_mb_stats;
928 unsigned int s_mb_order2_reqs;
929 unsigned int s_mb_group_prealloc;
930 /* where last allocation was done - for stream allocation */
931 unsigned long s_mb_last_group;
932 unsigned long s_mb_last_start;
933
934 /* history to debug policy */
935 struct ext4_mb_history *s_mb_history;
936 int s_mb_history_cur;
937 int s_mb_history_max;
938 int s_mb_history_num;
939 spinlock_t s_mb_history_lock;
940 int s_mb_history_filter;
941
942 /* stats for buddy allocator */
943 spinlock_t s_mb_pa_lock;
944 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
945 atomic_t s_bal_success; /* we found long enough chunks */
946 atomic_t s_bal_allocated; /* in blocks */
947 atomic_t s_bal_ex_scanned; /* total extents scanned */
948 atomic_t s_bal_goals; /* goal hits */
949 atomic_t s_bal_breaks; /* too long searches */
950 atomic_t s_bal_2orders; /* 2^order hits */
951 spinlock_t s_bal_lock;
952 unsigned long s_mb_buddies_generated;
953 unsigned long long s_mb_generation_time;
954 atomic_t s_mb_lost_chunks;
955 atomic_t s_mb_preallocated;
956 atomic_t s_mb_discarded;
957
958 /* locality groups */
959 struct ext4_locality_group *s_locality_groups;
960
961 /* for write statistics */
962 unsigned long s_sectors_written_start;
963 u64 s_kbytes_written;
964
965 unsigned int s_log_groups_per_flex;
966 struct flex_groups *s_flex_groups;
967 };
968
969 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
970 {
971 return sb->s_fs_info;
972 }
973 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
974 {
975 return container_of(inode, struct ext4_inode_info, vfs_inode);
976 }
977
978 static inline struct timespec ext4_current_time(struct inode *inode)
979 {
980 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
981 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
982 }
983
984 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
985 {
986 return ino == EXT4_ROOT_INO ||
987 ino == EXT4_JOURNAL_INO ||
988 ino == EXT4_RESIZE_INO ||
989 (ino >= EXT4_FIRST_INO(sb) &&
990 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
991 }
992 #else
993 /* Assume that user mode programs are passing in an ext4fs superblock, not
994 * a kernel struct super_block. This will allow us to call the feature-test
995 * macros from user land. */
996 #define EXT4_SB(sb) (sb)
997 #endif
998
999 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1000
1001 /*
1002 * Codes for operating systems
1003 */
1004 #define EXT4_OS_LINUX 0
1005 #define EXT4_OS_HURD 1
1006 #define EXT4_OS_MASIX 2
1007 #define EXT4_OS_FREEBSD 3
1008 #define EXT4_OS_LITES 4
1009
1010 /*
1011 * Revision levels
1012 */
1013 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1014 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1015
1016 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1017 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1018
1019 #define EXT4_GOOD_OLD_INODE_SIZE 128
1020
1021 /*
1022 * Feature set definitions
1023 */
1024
1025 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1026 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1027 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1028 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1029 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1030 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1031 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1032 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1033 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1034 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1035 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1036 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1037 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1038 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1039 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1040 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1041 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1042 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1043
1044 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1045 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1046 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1047 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1048 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1049 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1050
1051 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1052 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1053 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1054 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1055 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1056 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1057 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1058
1059 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1060 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1061 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1062 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1063 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1064 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1065 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1066 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1067 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1068
1069 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1070 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1071 EXT4_FEATURE_INCOMPAT_RECOVER| \
1072 EXT4_FEATURE_INCOMPAT_META_BG| \
1073 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1074 EXT4_FEATURE_INCOMPAT_64BIT| \
1075 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1076 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1077 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1078 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1079 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1080 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1081 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1082 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1083
1084 /*
1085 * Default values for user and/or group using reserved blocks
1086 */
1087 #define EXT4_DEF_RESUID 0
1088 #define EXT4_DEF_RESGID 0
1089
1090 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1091
1092 /*
1093 * Default mount options
1094 */
1095 #define EXT4_DEFM_DEBUG 0x0001
1096 #define EXT4_DEFM_BSDGROUPS 0x0002
1097 #define EXT4_DEFM_XATTR_USER 0x0004
1098 #define EXT4_DEFM_ACL 0x0008
1099 #define EXT4_DEFM_UID16 0x0010
1100 #define EXT4_DEFM_JMODE 0x0060
1101 #define EXT4_DEFM_JMODE_DATA 0x0020
1102 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1103 #define EXT4_DEFM_JMODE_WBACK 0x0060
1104
1105 /*
1106 * Default journal batch times
1107 */
1108 #define EXT4_DEF_MIN_BATCH_TIME 0
1109 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1110
1111 /*
1112 * Minimum number of groups in a flexgroup before we separate out
1113 * directories into the first block group of a flexgroup
1114 */
1115 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1116
1117 /*
1118 * Structure of a directory entry
1119 */
1120 #define EXT4_NAME_LEN 255
1121
1122 struct ext4_dir_entry {
1123 __le32 inode; /* Inode number */
1124 __le16 rec_len; /* Directory entry length */
1125 __le16 name_len; /* Name length */
1126 char name[EXT4_NAME_LEN]; /* File name */
1127 };
1128
1129 /*
1130 * The new version of the directory entry. Since EXT4 structures are
1131 * stored in intel byte order, and the name_len field could never be
1132 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1133 * file_type field.
1134 */
1135 struct ext4_dir_entry_2 {
1136 __le32 inode; /* Inode number */
1137 __le16 rec_len; /* Directory entry length */
1138 __u8 name_len; /* Name length */
1139 __u8 file_type;
1140 char name[EXT4_NAME_LEN]; /* File name */
1141 };
1142
1143 /*
1144 * Ext4 directory file types. Only the low 3 bits are used. The
1145 * other bits are reserved for now.
1146 */
1147 #define EXT4_FT_UNKNOWN 0
1148 #define EXT4_FT_REG_FILE 1
1149 #define EXT4_FT_DIR 2
1150 #define EXT4_FT_CHRDEV 3
1151 #define EXT4_FT_BLKDEV 4
1152 #define EXT4_FT_FIFO 5
1153 #define EXT4_FT_SOCK 6
1154 #define EXT4_FT_SYMLINK 7
1155
1156 #define EXT4_FT_MAX 8
1157
1158 /*
1159 * EXT4_DIR_PAD defines the directory entries boundaries
1160 *
1161 * NOTE: It must be a multiple of 4
1162 */
1163 #define EXT4_DIR_PAD 4
1164 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1165 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1166 ~EXT4_DIR_ROUND)
1167 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1168
1169 /*
1170 * Hash Tree Directory indexing
1171 * (c) Daniel Phillips, 2001
1172 */
1173
1174 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1175 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1176 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1177 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1178 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1179
1180 /* Legal values for the dx_root hash_version field: */
1181
1182 #define DX_HASH_LEGACY 0
1183 #define DX_HASH_HALF_MD4 1
1184 #define DX_HASH_TEA 2
1185 #define DX_HASH_LEGACY_UNSIGNED 3
1186 #define DX_HASH_HALF_MD4_UNSIGNED 4
1187 #define DX_HASH_TEA_UNSIGNED 5
1188
1189 #ifdef __KERNEL__
1190
1191 /* hash info structure used by the directory hash */
1192 struct dx_hash_info
1193 {
1194 u32 hash;
1195 u32 minor_hash;
1196 int hash_version;
1197 u32 *seed;
1198 };
1199
1200 #define EXT4_HTREE_EOF 0x7fffffff
1201
1202 /*
1203 * Control parameters used by ext4_htree_next_block
1204 */
1205 #define HASH_NB_ALWAYS 1
1206
1207
1208 /*
1209 * Describe an inode's exact location on disk and in memory
1210 */
1211 struct ext4_iloc
1212 {
1213 struct buffer_head *bh;
1214 unsigned long offset;
1215 ext4_group_t block_group;
1216 };
1217
1218 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1219 {
1220 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1221 }
1222
1223 /*
1224 * This structure is stuffed into the struct file's private_data field
1225 * for directories. It is where we put information so that we can do
1226 * readdir operations in hash tree order.
1227 */
1228 struct dir_private_info {
1229 struct rb_root root;
1230 struct rb_node *curr_node;
1231 struct fname *extra_fname;
1232 loff_t last_pos;
1233 __u32 curr_hash;
1234 __u32 curr_minor_hash;
1235 __u32 next_hash;
1236 };
1237
1238 /* calculate the first block number of the group */
1239 static inline ext4_fsblk_t
1240 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1241 {
1242 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1243 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1244 }
1245
1246 /*
1247 * Special error return code only used by dx_probe() and its callers.
1248 */
1249 #define ERR_BAD_DX_DIR -75000
1250
1251 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1252 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1253
1254 extern struct proc_dir_entry *ext4_proc_root;
1255
1256 /*
1257 * Function prototypes
1258 */
1259
1260 /*
1261 * Ok, these declarations are also in <linux/kernel.h> but none of the
1262 * ext4 source programs needs to include it so they are duplicated here.
1263 */
1264 # define NORET_TYPE /**/
1265 # define ATTRIB_NORET __attribute__((noreturn))
1266 # define NORET_AND noreturn,
1267
1268 /* bitmap.c */
1269 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1270
1271 /* balloc.c */
1272 extern unsigned int ext4_block_group(struct super_block *sb,
1273 ext4_fsblk_t blocknr);
1274 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1275 ext4_fsblk_t blocknr);
1276 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1277 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1278 ext4_group_t group);
1279 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1280 ext4_fsblk_t goal, unsigned long *count, int *errp);
1281 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1282 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1283 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1284 ext4_fsblk_t block, unsigned long count, int metadata);
1285 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1286 ext4_fsblk_t block, unsigned long count);
1287 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1288 extern void ext4_check_blocks_bitmap(struct super_block *);
1289 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1290 ext4_group_t block_group,
1291 struct buffer_head ** bh);
1292 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1293 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1294 ext4_group_t block_group);
1295 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1296 struct buffer_head *bh,
1297 ext4_group_t group,
1298 struct ext4_group_desc *desc);
1299 #define ext4_free_blocks_after_init(sb, group, desc) \
1300 ext4_init_block_bitmap(sb, NULL, group, desc)
1301
1302 /* dir.c */
1303 extern int ext4_check_dir_entry(const char *, struct inode *,
1304 struct ext4_dir_entry_2 *,
1305 struct buffer_head *, unsigned int);
1306 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1307 __u32 minor_hash,
1308 struct ext4_dir_entry_2 *dirent);
1309 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1310
1311 /* fsync.c */
1312 extern int ext4_sync_file(struct file *, struct dentry *, int);
1313
1314 /* hash.c */
1315 extern int ext4fs_dirhash(const char *name, int len, struct
1316 dx_hash_info *hinfo);
1317
1318 /* ialloc.c */
1319 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1320 const struct qstr *qstr, __u32 goal);
1321 extern void ext4_free_inode(handle_t *, struct inode *);
1322 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1323 extern unsigned long ext4_count_free_inodes(struct super_block *);
1324 extern unsigned long ext4_count_dirs(struct super_block *);
1325 extern void ext4_check_inodes_bitmap(struct super_block *);
1326 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1327 struct buffer_head *bh,
1328 ext4_group_t group,
1329 struct ext4_group_desc *desc);
1330 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1331
1332 /* mballoc.c */
1333 extern long ext4_mb_stats;
1334 extern long ext4_mb_max_to_scan;
1335 extern int ext4_mb_init(struct super_block *, int);
1336 extern int ext4_mb_release(struct super_block *);
1337 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1338 struct ext4_allocation_request *, int *);
1339 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1340 extern void ext4_discard_preallocations(struct inode *);
1341 extern int __init init_ext4_mballoc(void);
1342 extern void exit_ext4_mballoc(void);
1343 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1344 ext4_fsblk_t, unsigned long, int, unsigned long *);
1345 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1346 ext4_group_t i, struct ext4_group_desc *desc);
1347 extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1348 ext4_grpblk_t add);
1349 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1350 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1351 ext4_group_t, int);
1352 /* inode.c */
1353 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1354 struct buffer_head *bh, ext4_fsblk_t blocknr);
1355 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1356 ext4_lblk_t, int, int *);
1357 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1358 ext4_lblk_t, int, int *);
1359 int ext4_get_block(struct inode *inode, sector_t iblock,
1360 struct buffer_head *bh_result, int create);
1361
1362 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1363 extern int ext4_write_inode(struct inode *, int);
1364 extern int ext4_setattr(struct dentry *, struct iattr *);
1365 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1366 struct kstat *stat);
1367 extern void ext4_delete_inode(struct inode *);
1368 extern int ext4_sync_inode(handle_t *, struct inode *);
1369 extern void ext4_dirty_inode(struct inode *);
1370 extern int ext4_change_inode_journal_flag(struct inode *, int);
1371 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1372 extern int ext4_can_truncate(struct inode *inode);
1373 extern void ext4_truncate(struct inode *);
1374 extern void ext4_set_inode_flags(struct inode *);
1375 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1376 extern int ext4_alloc_da_blocks(struct inode *inode);
1377 extern void ext4_set_aops(struct inode *inode);
1378 extern int ext4_writepage_trans_blocks(struct inode *);
1379 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1380 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1381 extern int ext4_block_truncate_page(handle_t *handle,
1382 struct address_space *mapping, loff_t from);
1383 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1384 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1385
1386 /* ioctl.c */
1387 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1388 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1389
1390 /* migrate.c */
1391 extern int ext4_ext_migrate(struct inode *);
1392
1393 /* namei.c */
1394 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1395 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1396 extern int ext4_orphan_add(handle_t *, struct inode *);
1397 extern int ext4_orphan_del(handle_t *, struct inode *);
1398 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1399 __u32 start_minor_hash, __u32 *next_hash);
1400
1401 /* resize.c */
1402 extern int ext4_group_add(struct super_block *sb,
1403 struct ext4_new_group_data *input);
1404 extern int ext4_group_extend(struct super_block *sb,
1405 struct ext4_super_block *es,
1406 ext4_fsblk_t n_blocks_count);
1407
1408 /* super.c */
1409 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1410 __attribute__ ((format (printf, 3, 4)));
1411 extern void __ext4_std_error(struct super_block *, const char *, int);
1412 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1413 __attribute__ ((format (printf, 3, 4)));
1414 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1415 __attribute__ ((format (printf, 3, 4)));
1416 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1417 __attribute__ ((format (printf, 3, 4)));
1418 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1419 const char *, const char *, ...)
1420 __attribute__ ((format (printf, 4, 5)));
1421 extern void ext4_update_dynamic_rev(struct super_block *sb);
1422 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1423 __u32 compat);
1424 extern int ext4_update_rocompat_feature(handle_t *handle,
1425 struct super_block *sb, __u32 rocompat);
1426 extern int ext4_update_incompat_feature(handle_t *handle,
1427 struct super_block *sb, __u32 incompat);
1428 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1429 struct ext4_group_desc *bg);
1430 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1431 struct ext4_group_desc *bg);
1432 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1433 struct ext4_group_desc *bg);
1434 extern __u32 ext4_free_blks_count(struct super_block *sb,
1435 struct ext4_group_desc *bg);
1436 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1437 struct ext4_group_desc *bg);
1438 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1439 struct ext4_group_desc *bg);
1440 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1441 struct ext4_group_desc *bg);
1442 extern void ext4_block_bitmap_set(struct super_block *sb,
1443 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1444 extern void ext4_inode_bitmap_set(struct super_block *sb,
1445 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1446 extern void ext4_inode_table_set(struct super_block *sb,
1447 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1448 extern void ext4_free_blks_set(struct super_block *sb,
1449 struct ext4_group_desc *bg, __u32 count);
1450 extern void ext4_free_inodes_set(struct super_block *sb,
1451 struct ext4_group_desc *bg, __u32 count);
1452 extern void ext4_used_dirs_set(struct super_block *sb,
1453 struct ext4_group_desc *bg, __u32 count);
1454 extern void ext4_itable_unused_set(struct super_block *sb,
1455 struct ext4_group_desc *bg, __u32 count);
1456 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1457 struct ext4_group_desc *gdp);
1458 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1459 struct ext4_group_desc *gdp);
1460
1461 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1462 {
1463 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1464 le32_to_cpu(es->s_blocks_count_lo);
1465 }
1466
1467 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1468 {
1469 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1470 le32_to_cpu(es->s_r_blocks_count_lo);
1471 }
1472
1473 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1474 {
1475 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1476 le32_to_cpu(es->s_free_blocks_count_lo);
1477 }
1478
1479 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1480 ext4_fsblk_t blk)
1481 {
1482 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1483 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1484 }
1485
1486 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1487 ext4_fsblk_t blk)
1488 {
1489 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1490 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1491 }
1492
1493 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1494 ext4_fsblk_t blk)
1495 {
1496 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1497 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1498 }
1499
1500 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1501 {
1502 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1503 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1504 le32_to_cpu(raw_inode->i_size_lo);
1505 else
1506 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1507 }
1508
1509 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1510 {
1511 raw_inode->i_size_lo = cpu_to_le32(i_size);
1512 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1513 }
1514
1515 static inline
1516 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1517 ext4_group_t group)
1518 {
1519 struct ext4_group_info ***grp_info;
1520 long indexv, indexh;
1521 grp_info = EXT4_SB(sb)->s_group_info;
1522 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1523 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1524 return grp_info[indexv][indexh];
1525 }
1526
1527 /*
1528 * Reading s_groups_count requires using smp_rmb() afterwards. See
1529 * the locking protocol documented in the comments of ext4_group_add()
1530 * in resize.c
1531 */
1532 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1533 {
1534 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1535
1536 smp_rmb();
1537 return ngroups;
1538 }
1539
1540 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1541 ext4_group_t block_group)
1542 {
1543 return block_group >> sbi->s_log_groups_per_flex;
1544 }
1545
1546 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1547 {
1548 return 1 << sbi->s_log_groups_per_flex;
1549 }
1550
1551 #define ext4_std_error(sb, errno) \
1552 do { \
1553 if ((errno)) \
1554 __ext4_std_error((sb), __func__, (errno)); \
1555 } while (0)
1556
1557 #ifdef CONFIG_SMP
1558 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1559 * counters. So we need to make sure we have free blocks more
1560 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1561 */
1562 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1563 #else
1564 #define EXT4_FREEBLOCKS_WATERMARK 0
1565 #endif
1566
1567 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1568 {
1569 /*
1570 * XXX: replace with spinlock if seen contended -bzzz
1571 */
1572 down_write(&EXT4_I(inode)->i_data_sem);
1573 if (newsize > EXT4_I(inode)->i_disksize)
1574 EXT4_I(inode)->i_disksize = newsize;
1575 up_write(&EXT4_I(inode)->i_data_sem);
1576 return ;
1577 }
1578
1579 struct ext4_group_info {
1580 unsigned long bb_state;
1581 struct rb_root bb_free_root;
1582 unsigned short bb_first_free;
1583 unsigned short bb_free;
1584 unsigned short bb_fragments;
1585 struct list_head bb_prealloc_list;
1586 #ifdef DOUBLE_CHECK
1587 void *bb_bitmap;
1588 #endif
1589 struct rw_semaphore alloc_sem;
1590 unsigned short bb_counters[];
1591 };
1592
1593 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1594
1595 #define EXT4_MB_GRP_NEED_INIT(grp) \
1596 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1597
1598 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1599 ext4_group_t group)
1600 {
1601 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1602 }
1603
1604 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1605 {
1606 spin_lock(ext4_group_lock_ptr(sb, group));
1607 }
1608
1609 static inline void ext4_unlock_group(struct super_block *sb,
1610 ext4_group_t group)
1611 {
1612 spin_unlock(ext4_group_lock_ptr(sb, group));
1613 }
1614
1615 /*
1616 * Inodes and files operations
1617 */
1618
1619 /* dir.c */
1620 extern const struct file_operations ext4_dir_operations;
1621
1622 /* file.c */
1623 extern const struct inode_operations ext4_file_inode_operations;
1624 extern const struct file_operations ext4_file_operations;
1625
1626 /* namei.c */
1627 extern const struct inode_operations ext4_dir_inode_operations;
1628 extern const struct inode_operations ext4_special_inode_operations;
1629 extern struct dentry *ext4_get_parent(struct dentry *child);
1630
1631 /* symlink.c */
1632 extern const struct inode_operations ext4_symlink_inode_operations;
1633 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1634
1635 /* block_validity */
1636 extern void ext4_release_system_zone(struct super_block *sb);
1637 extern int ext4_setup_system_zone(struct super_block *sb);
1638 extern int __init init_ext4_system_zone(void);
1639 extern void exit_ext4_system_zone(void);
1640 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1641 ext4_fsblk_t start_blk,
1642 unsigned int count);
1643
1644 /* extents.c */
1645 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1646 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1647 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1648 int chunk);
1649 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1650 ext4_lblk_t iblock, unsigned int max_blocks,
1651 struct buffer_head *bh_result, int flags);
1652 extern void ext4_ext_truncate(struct inode *);
1653 extern void ext4_ext_init(struct super_block *);
1654 extern void ext4_ext_release(struct super_block *);
1655 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1656 loff_t len);
1657 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1658 sector_t block, unsigned int max_blocks,
1659 struct buffer_head *bh, int flags);
1660 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1661 __u64 start, __u64 len);
1662 /* move_extent.c */
1663 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1664 __u64 start_orig, __u64 start_donor,
1665 __u64 len, __u64 *moved_len);
1666
1667
1668 /*
1669 * Add new method to test wether block and inode bitmaps are properly
1670 * initialized. With uninit_bg reading the block from disk is not enough
1671 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1672 */
1673 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1674
1675 static inline int bitmap_uptodate(struct buffer_head *bh)
1676 {
1677 return (buffer_uptodate(bh) &&
1678 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1679 }
1680 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1681 {
1682 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1683 }
1684
1685 #endif /* __KERNEL__ */
1686
1687 #endif /* _EXT4_H */
Linux kernel - Deliverables
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