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ac27a0ec 1/*
3dcf5451 2 * ext4.h
ac27a0ec
DK		 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
3dcf5451
CH		 16#ifndef _EXT4_H
17#define _EXT4_H
ac27a0ec
DK		 18
19#include <linux/types.h>
3a5b2ecd 20#include <linux/blkdev.h>
ac27a0ec 21#include <linux/magic.h>
2ccb5fb9 22#include <linux/jbd2.h>
60e58e0f 23#include <linux/quota.h>
3dcf5451 24#include "ext4_i.h"
c9de560d 25
ac27a0ec 26/*
8a35694e 27 * The fourth extended filesystem constants/structures
ac27a0ec
DK		 28 */
29
30/*
617ba13b 31 * Define EXT4FS_DEBUG to produce debug messages
ac27a0ec 32 */
617ba13b 33#undef EXT4FS_DEBUG
ac27a0ec
DK		 34
35/*
617ba13b 36 * Define EXT4_RESERVATION to reserve data blocks for expanding files
ac27a0ec 37 */
8c55e204 38#define EXT4_DEFAULT_RESERVE_BLOCKS 8
ac27a0ec 39/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
8c55e204 40#define EXT4_MAX_RESERVE_BLOCKS 1027
617ba13b 41#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
ac27a0ec
DK		 42
43/*
44 * Debug code
45 */
617ba13b
MC		 46#ifdef EXT4FS_DEBUG
47#define ext4_debug(f, a...) \
ac27a0ec 48 do { \
af5bc92d 49 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
4db9c54a 50 __FILE__, __LINE__, __func__); \
af5bc92d 51 printk(KERN_DEBUG f, ## a); \
ac27a0ec
DK		 52 } while (0)
53#else
617ba13b 54#define ext4_debug(f, a...) do {} while (0)
ac27a0ec
DK		 55#endif
56
c9de560d
AT		 57#define EXT4_MULTIBLOCK_ALLOCATOR 1
58
59/* prefer goal again. length */
60#define EXT4_MB_HINT_MERGE 1
61/* blocks already reserved */
62#define EXT4_MB_HINT_RESERVED 2
63/* metadata is being allocated */
64#define EXT4_MB_HINT_METADATA 4
65/* first blocks in the file */
66#define EXT4_MB_HINT_FIRST 8
67/* search for the best chunk */
68#define EXT4_MB_HINT_BEST 16
69/* data is being allocated */
70#define EXT4_MB_HINT_DATA 32
71/* don't preallocate (for tails) */
72#define EXT4_MB_HINT_NOPREALLOC 64
73/* allocate for locality group */
74#define EXT4_MB_HINT_GROUP_ALLOC 128
75/* allocate goal blocks or none */
76#define EXT4_MB_HINT_GOAL_ONLY 256
77/* goal is meaningful */
78#define EXT4_MB_HINT_TRY_GOAL 512
d2a17637
MC		 79/* blocks already pre-reserved by delayed allocation */
80#define EXT4_MB_DELALLOC_RESERVED 1024
81
c9de560d
AT		 82
83struct ext4_allocation_request {
84 /* target inode for block we're allocating */
85 struct inode *inode;
86 /* logical block in target inode */
87 ext4_lblk_t logical;
88 /* phys. target (a hint) */
89 ext4_fsblk_t goal;
90 /* the closest logical allocated block to the left */
91 ext4_lblk_t lleft;
92 /* phys. block for ^^^ */
93 ext4_fsblk_t pleft;
94 /* the closest logical allocated block to the right */
95 ext4_lblk_t lright;
96 /* phys. block for ^^^ */
97 ext4_fsblk_t pright;
98 /* how many blocks we want to allocate */
498e5f24 99 unsigned int len;
c9de560d 100 /* flags. see above EXT4_MB_HINT_* */
498e5f24 101 unsigned int flags;
c9de560d
AT		 102};
103
ac27a0ec
DK		 104/*
105 * Special inodes numbers
106 */
617ba13b
MC		 107#define EXT4_BAD_INO 1 /* Bad blocks inode */
108#define EXT4_ROOT_INO 2 /* Root inode */
109#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
110#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
111#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
112#define EXT4_JOURNAL_INO 8 /* Journal inode */
ac27a0ec 113
617ba13b
MC		 114/* First non-reserved inode for old ext4 filesystems */
115#define EXT4_GOOD_OLD_FIRST_INO 11
ac27a0ec
DK		 116
117/*
118 * Maximal count of links to a file
119 */
f8628a14 120#define EXT4_LINK_MAX 65000
ac27a0ec
DK		 121
122/*
123 * Macro-instructions used to manage several block sizes
124 */
617ba13b 125#define EXT4_MIN_BLOCK_SIZE 1024
afc7cbca
TS		 126#define EXT4_MAX_BLOCK_SIZE 65536
127#define EXT4_MIN_BLOCK_LOG_SIZE 10
ac27a0ec 128#ifdef __KERNEL__
617ba13b 129# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
ac27a0ec 130#else
617ba13b 131# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
ac27a0ec 132#endif
af5bc92d 133#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
ac27a0ec 134#ifdef __KERNEL__
617ba13b 135# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
ac27a0ec 136#else
617ba13b 137# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
ac27a0ec
DK		 138#endif
139#ifdef __KERNEL__
617ba13b
MC		 140#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
141#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
142#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
ac27a0ec 143#else
617ba13b
MC		 144#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
145 EXT4_GOOD_OLD_INODE_SIZE : \
ac27a0ec 146 (s)->s_inode_size)
617ba13b
MC		 147#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
148 EXT4_GOOD_OLD_FIRST_INO : \
ac27a0ec
DK		 149 (s)->s_first_ino)
150#endif
a2df2a63 151#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
ac27a0ec 152
ac27a0ec
DK		 153/*
154 * Structure of a blocks group descriptor
155 */
617ba13b 156struct ext4_group_desc
ac27a0ec 157{
3a14589c 158 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
5272f837
AK		 159 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
160 __le32 bg_inode_table_lo; /* Inodes table block */
560671a0
AK		 161 __le16 bg_free_blocks_count_lo;/* Free blocks count */
162 __le16 bg_free_inodes_count_lo;/* Free inodes count */
163 __le16 bg_used_dirs_count_lo; /* Directories count */
717d50e4
AD		 164 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
165 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
560671a0 166 __le16 bg_itable_unused_lo; /* Unused inodes count */
717d50e4 167 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
8fadc143
AR		 168 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
169 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
170 __le32 bg_inode_table_hi; /* Inodes table block MSB */
91b51a01
CL		 171 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
172 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
173 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
560671a0 174 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
91b51a01 175 __u32 bg_reserved2[3];
ac27a0ec
DK		 176};
177
772cb7c8
JS		 178/*
179 * Structure of a flex block group info
180 */
181
182struct flex_groups {
183 __u32 free_inodes;
184 __u32 free_blocks;
185};
186
717d50e4
AD		 187#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
188#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
189#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
190
bd81d8ee 191#ifdef __KERNEL__
3dcf5451 192#include "ext4_sb.h"
bd81d8ee 193#endif
ac27a0ec
DK		 194/*
195 * Macro-instructions used to manage group descriptors
196 */
0d1ee42f 197#define EXT4_MIN_DESC_SIZE 32
8fadc143 198#define EXT4_MIN_DESC_SIZE_64BIT 64
0d1ee42f
AR		 199#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
200#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
ac27a0ec 201#ifdef __KERNEL__
617ba13b
MC		 202# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
203# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
204# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
205# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
ac27a0ec 206#else
617ba13b 207# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
0d1ee42f 208# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
617ba13b 209# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
ac27a0ec
DK		 210#endif
211
212/*
213 * Constants relative to the data blocks
214 */
617ba13b
MC		 215#define EXT4_NDIR_BLOCKS 12
216#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
217#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
218#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
219#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
ac27a0ec
DK		 220
221/*
222 * Inode flags
223 */
617ba13b
MC		 224#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
225#define EXT4_UNRM_FL 0x00000002 /* Undelete */
226#define EXT4_COMPR_FL 0x00000004 /* Compress file */
227#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
228#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
229#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
230#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
231#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
ac27a0ec 232/* Reserved for compression usage... */
617ba13b
MC		 233#define EXT4_DIRTY_FL 0x00000100
234#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
235#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
236#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
ac27a0ec 237/* End compression flags --- maybe not all used */
617ba13b
MC		 238#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
239#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
240#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
241#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
242#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
243#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
8180a562 244#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
a86c6181 245#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
267e4db9 246#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
8180a562 247#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
ac27a0ec 248
a86c6181 249#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
4db46fc2 250#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
ac27a0ec
DK		 251
252/*
253 * Inode dynamic state flags
254 */
617ba13b
MC		 255#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
256#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
257#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
6dd4ee7c 258#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
ac27a0ec
DK		 259
260/* Used to pass group descriptor data when online resize is done */
617ba13b 261struct ext4_new_group_input {
8c55e204
DK		 262 __u32 group; /* Group number for this data */
263 __u64 block_bitmap; /* Absolute block number of block bitmap */
264 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
265 __u64 inode_table; /* Absolute block number of inode table start */
266 __u32 blocks_count; /* Total number of blocks in this group */
267 __u16 reserved_blocks; /* Number of reserved blocks in this group */
ac27a0ec
DK		 268 __u16 unused;
269};
270
617ba13b
MC		 271/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
272struct ext4_new_group_data {
ac27a0ec 273 __u32 group;
bd81d8ee
LV		 274 __u64 block_bitmap;
275 __u64 inode_bitmap;
276 __u64 inode_table;
ac27a0ec
DK		 277 __u32 blocks_count;
278 __u16 reserved_blocks;
279 __u16 unused;
280 __u32 free_blocks_count;
281};
282
a2df2a63
AA		 283/*
284 * Following is used by preallocation code to tell get_blocks() that we
285 * want uninitialzed extents.
286 */
287#define EXT4_CREATE_UNINITIALIZED_EXT 2
ac27a0ec
DK		 288
289/*
290 * ioctl commands
291 */
617ba13b
MC		 292#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
293#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
294#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
295#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
617ba13b
MC		 296#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
297#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
e23291b9 298#ifdef CONFIG_JBD2_DEBUG
617ba13b 299#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
ac27a0ec 300#endif
617ba13b
MC		 301#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
302#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
8eea80d5
TT		 303#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
304#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
305#define EXT4_IOC_MIGRATE _IO('f', 9)
306 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
ac27a0ec
DK		 307
308/*
309 * ioctl commands in 32 bit emulation
310 */
617ba13b
MC		 311#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
312#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
313#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
314#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
315#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
316#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
317#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
e23291b9 318#ifdef CONFIG_JBD2_DEBUG
617ba13b 319#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
ac27a0ec 320#endif
617ba13b
MC		 321#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
322#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
ac27a0ec
DK		 323
324
325/*
326 * Mount options
327 */
617ba13b 328struct ext4_mount_options {
ac27a0ec
DK		 329 unsigned long s_mount_opt;
330 uid_t s_resuid;
331 gid_t s_resgid;
332 unsigned long s_commit_interval;
30773840 333 u32 s_min_batch_time, s_max_batch_time;
ac27a0ec
DK		 334#ifdef CONFIG_QUOTA
335 int s_jquota_fmt;
336 char *s_qf_names[MAXQUOTAS];
337#endif
338};
339
340/*
341 * Structure of an inode on the disk
342 */
617ba13b 343struct ext4_inode {
ac27a0ec
DK		 344 __le16 i_mode; /* File mode */
345 __le16 i_uid; /* Low 16 bits of Owner Uid */
a48380f7 346 __le32 i_size_lo; /* Size in bytes */
ac27a0ec 347 __le32 i_atime; /* Access time */
ef7f3835 348 __le32 i_ctime; /* Inode Change time */
ac27a0ec
DK		 349 __le32 i_mtime; /* Modification time */
350 __le32 i_dtime; /* Deletion Time */
351 __le16 i_gid; /* Low 16 bits of Group Id */
352 __le16 i_links_count; /* Links count */
0fc1b451 353 __le32 i_blocks_lo; /* Blocks count */
ac27a0ec
DK		 354 __le32 i_flags; /* File flags */
355 union {
356 struct {
25ec56b5 357 __le32 l_i_version;
ac27a0ec
DK		 358 } linux1;
359 struct {
360 __u32 h_i_translator;
361 } hurd1;
362 struct {
363 __u32 m_i_reserved1;
364 } masix1;
365 } osd1; /* OS dependent 1 */
617ba13b 366 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
ac27a0ec 367 __le32 i_generation; /* File version (for NFS) */
7973c0c1 368 __le32 i_file_acl_lo; /* File ACL */
a48380f7 369 __le32 i_size_high;
f077d0d7 370 __le32 i_obso_faddr; /* Obsoleted fragment address */
ac27a0ec
DK		 371 union {
372 struct {
0fc1b451 373 __le16 l_i_blocks_high; /* were l_i_reserved1 */
a1ddeb7e 374 __le16 l_i_file_acl_high;
8c55e204 375 __le16 l_i_uid_high; /* these 2 fields */
ac27a0ec
DK		 376 __le16 l_i_gid_high; /* were reserved2[0] */
377 __u32 l_i_reserved2;
378 } linux2;
379 struct {
f077d0d7 380 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
ac27a0ec
DK		 381 __u16 h_i_mode_high;
382 __u16 h_i_uid_high;
383 __u16 h_i_gid_high;
384 __u32 h_i_author;
385 } hurd2;
386 struct {
f077d0d7 387 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
a1ddeb7e 388 __le16 m_i_file_acl_high;
ac27a0ec
DK		 389 __u32 m_i_reserved2[2];
390 } masix2;
391 } osd2; /* OS dependent 2 */
392 __le16 i_extra_isize;
393 __le16 i_pad1;
ef7f3835
KS		 394 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
395 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
396 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
397 __le32 i_crtime; /* File Creation time */
398 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
25ec56b5 399 __le32 i_version_hi; /* high 32 bits for 64-bit version */
ac27a0ec
DK		 400};
401
ac27a0ec 402
ef7f3835
KS		 403#define EXT4_EPOCH_BITS 2
404#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
405#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
406
407/*
408 * Extended fields will fit into an inode if the filesystem was formatted
409 * with large inodes (-I 256 or larger) and there are not currently any EAs
410 * consuming all of the available space. For new inodes we always reserve
411 * enough space for the kernel's known extended fields, but for inodes
412 * created with an old kernel this might not have been the case. None of
413 * the extended inode fields is critical for correct filesystem operation.
414 * This macro checks if a certain field fits in the inode. Note that
415 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
416 */
417#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
418 ((offsetof(typeof(*ext4_inode), field) + \
419 sizeof((ext4_inode)->field)) \
420 <= (EXT4_GOOD_OLD_INODE_SIZE + \
421 (einode)->i_extra_isize)) \
422
423static inline __le32 ext4_encode_extra_time(struct timespec *time)
424{
425 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
426 time->tv_sec >> 32 : 0) |
427 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
428}
429
430static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
431{
432 if (sizeof(time->tv_sec) > 4)
433 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
434 << 32;
435 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
436}
437
438#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
439do { \
440 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
441 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
442 (raw_inode)->xtime ## _extra = \
443 ext4_encode_extra_time(&(inode)->xtime); \
444} while (0)
445
446#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
447do { \
448 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
449 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
450 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
451 (raw_inode)->xtime ## _extra = \
452 ext4_encode_extra_time(&(einode)->xtime); \
453} while (0)
454
455#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
456do { \
457 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
458 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
459 ext4_decode_extra_time(&(inode)->xtime, \
460 raw_inode->xtime ## _extra); \
461} while (0)
462
463#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
464do { \
465 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
466 (einode)->xtime.tv_sec = \
467 (signed)le32_to_cpu((raw_inode)->xtime); \
468 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
469 ext4_decode_extra_time(&(einode)->xtime, \
470 raw_inode->xtime ## _extra); \
471} while (0)
472
25ec56b5
JNC		 473#define i_disk_version osd1.linux1.l_i_version
474
ac27a0ec
DK		 475#if defined(__KERNEL__) || defined(__linux__)
476#define i_reserved1 osd1.linux1.l_i_reserved1
a1ddeb7e 477#define i_file_acl_high osd2.linux2.l_i_file_acl_high
0fc1b451 478#define i_blocks_high osd2.linux2.l_i_blocks_high
ac27a0ec
DK		 479#define i_uid_low i_uid
480#define i_gid_low i_gid
481#define i_uid_high osd2.linux2.l_i_uid_high
482#define i_gid_high osd2.linux2.l_i_gid_high
483#define i_reserved2 osd2.linux2.l_i_reserved2
484
485#elif defined(__GNU__)
486
487#define i_translator osd1.hurd1.h_i_translator
ac27a0ec
DK		 488#define i_uid_high osd2.hurd2.h_i_uid_high
489#define i_gid_high osd2.hurd2.h_i_gid_high
490#define i_author osd2.hurd2.h_i_author
491
492#elif defined(__masix__)
493
494#define i_reserved1 osd1.masix1.m_i_reserved1
a1ddeb7e 495#define i_file_acl_high osd2.masix2.m_i_file_acl_high
ac27a0ec
DK		 496#define i_reserved2 osd2.masix2.m_i_reserved2
497
498#endif /* defined(__KERNEL__) || defined(__linux__) */
499
500/*
501 * File system states
502 */
617ba13b
MC		 503#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
504#define EXT4_ERROR_FS 0x0002 /* Errors detected */
505#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
ac27a0ec 506
469108ff
TT		 507/*
508 * Misc. filesystem flags
509 */
510#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
511#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
512#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
513
ac27a0ec
DK		 514/*
515 * Mount flags
516 */
617ba13b
MC		 517#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
518#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
519#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
520#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
521#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
522#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
523#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
524#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
525#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
526#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
527#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
528#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
529#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
530#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
531#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
532#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
533#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
534#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
535#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
536#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
537#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
538#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
539#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
818d276c
GS		 540#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
541#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
25ec56b5 542#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
64769240 543#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
5bf5683a
HK		 544#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
545
617ba13b 546/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
ac27a0ec 547#ifndef _LINUX_EXT2_FS_H
617ba13b
MC		 548#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
549#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
550#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
551 EXT4_MOUNT_##opt)
ac27a0ec 552#else
617ba13b
MC		 553#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
554#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
555#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
ac27a0ec
DK		 556#endif
557
617ba13b
MC		 558#define ext4_set_bit ext2_set_bit
559#define ext4_set_bit_atomic ext2_set_bit_atomic
560#define ext4_clear_bit ext2_clear_bit
561#define ext4_clear_bit_atomic ext2_clear_bit_atomic
562#define ext4_test_bit ext2_test_bit
563#define ext4_find_first_zero_bit ext2_find_first_zero_bit
564#define ext4_find_next_zero_bit ext2_find_next_zero_bit
aa02ad67 565#define ext4_find_next_bit ext2_find_next_bit
ac27a0ec
DK		 566
567/*
568 * Maximal mount counts between two filesystem checks
569 */
617ba13b
MC		 570#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
571#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
ac27a0ec
DK		 572
573/*
574 * Behaviour when detecting errors
575 */
617ba13b
MC		 576#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
577#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
578#define EXT4_ERRORS_PANIC 3 /* Panic */
579#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
ac27a0ec
DK		 580
581/*
582 * Structure of the super block
583 */
617ba13b 584struct ext4_super_block {
ac27a0ec 585/*00*/ __le32 s_inodes_count; /* Inodes count */
6bc9feff 586 __le32 s_blocks_count_lo; /* Blocks count */
308ba3ec
AK		 587 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
588 __le32 s_free_blocks_count_lo; /* Free blocks count */
ac27a0ec
DK		 589/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
590 __le32 s_first_data_block; /* First Data Block */
591 __le32 s_log_block_size; /* Block size */
f077d0d7 592 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
ac27a0ec 593/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
f077d0d7 594 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
ac27a0ec
DK		 595 __le32 s_inodes_per_group; /* # Inodes per group */
596 __le32 s_mtime; /* Mount time */
597/*30*/ __le32 s_wtime; /* Write time */
598 __le16 s_mnt_count; /* Mount count */
599 __le16 s_max_mnt_count; /* Maximal mount count */
600 __le16 s_magic; /* Magic signature */
601 __le16 s_state; /* File system state */
602 __le16 s_errors; /* Behaviour when detecting errors */
603 __le16 s_minor_rev_level; /* minor revision level */
604/*40*/ __le32 s_lastcheck; /* time of last check */
605 __le32 s_checkinterval; /* max. time between checks */
606 __le32 s_creator_os; /* OS */
607 __le32 s_rev_level; /* Revision level */
608/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
609 __le16 s_def_resgid; /* Default gid for reserved blocks */
610 /*
617ba13b 611 * These fields are for EXT4_DYNAMIC_REV superblocks only.
ac27a0ec
DK		 612 *
613 * Note: the difference between the compatible feature set and
614 * the incompatible feature set is that if there is a bit set
615 * in the incompatible feature set that the kernel doesn't
616 * know about, it should refuse to mount the filesystem.
617 *
618 * e2fsck's requirements are more strict; if it doesn't know
619 * about a feature in either the compatible or incompatible
620 * feature set, it must abort and not try to meddle with
621 * things it doesn't understand...
622 */
623 __le32 s_first_ino; /* First non-reserved inode */
0d1ee42f 624 __le16 s_inode_size; /* size of inode structure */
ac27a0ec
DK		 625 __le16 s_block_group_nr; /* block group # of this superblock */
626 __le32 s_feature_compat; /* compatible feature set */
627/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
628 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
629/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
630/*78*/ char s_volume_name[16]; /* volume name */
631/*88*/ char s_last_mounted[64]; /* directory where last mounted */
632/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
633 /*
634 * Performance hints. Directory preallocation should only
617ba13b 635 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
ac27a0ec
DK		 636 */
637 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
638 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
639 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
640 /*
617ba13b 641 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
ac27a0ec
DK		 642 */
643/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
644/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
645 __le32 s_journal_dev; /* device number of journal file */
646 __le32 s_last_orphan; /* start of list of inodes to delete */
647 __le32 s_hash_seed[4]; /* HTREE hash seed */
648 __u8 s_def_hash_version; /* Default hash version to use */
649 __u8 s_reserved_char_pad;
0d1ee42f 650 __le16 s_desc_size; /* size of group descriptor */
bd81d8ee 651/*100*/ __le32 s_default_mount_opts;
ac27a0ec 652 __le32 s_first_meta_bg; /* First metablock block group */
bd81d8ee
LV		 653 __le32 s_mkfs_time; /* When the filesystem was created */
654 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
655 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
656/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
657 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
658 __le32 s_free_blocks_count_hi; /* Free blocks count */
c1bddad9
AK		 659 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
660 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
661 __le32 s_flags; /* Miscellaneous flags */
662 __le16 s_raid_stride; /* RAID stride */
663 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
664 __le64 s_mmp_block; /* Block for multi-mount protection */
665 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
772cb7c8
JS		 666 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
667 __u8 s_reserved_char_pad2;
668 __le16 s_reserved_pad;
669 __u32 s_reserved[162]; /* Padding to the end of the block */
ac27a0ec
DK		 670};
671
672#ifdef __KERNEL__
af5bc92d 673static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
ac27a0ec
DK		 674{
675 return sb->s_fs_info;
676}
617ba13b 677static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
ac27a0ec 678{
617ba13b 679 return container_of(inode, struct ext4_inode_info, vfs_inode);
ac27a0ec
DK		 680}
681
ef7f3835
KS		 682static inline struct timespec ext4_current_time(struct inode *inode)
683{
684 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
685 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
686}
687
688
617ba13b 689static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
ac27a0ec 690{
617ba13b
MC		 691 return ino == EXT4_ROOT_INO ||
692 ino == EXT4_JOURNAL_INO ||
693 ino == EXT4_RESIZE_INO ||
694 (ino >= EXT4_FIRST_INO(sb) &&
695 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
ac27a0ec
DK		 696}
697#else
617ba13b 698/* Assume that user mode programs are passing in an ext4fs superblock, not
ac27a0ec
DK		 699 * a kernel struct super_block. This will allow us to call the feature-test
700 * macros from user land. */
617ba13b 701#define EXT4_SB(sb) (sb)
ac27a0ec
DK		 702#endif
703
617ba13b 704#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
ac27a0ec
DK		 705
706/*
707 * Codes for operating systems
708 */
617ba13b
MC		 709#define EXT4_OS_LINUX 0
710#define EXT4_OS_HURD 1
711#define EXT4_OS_MASIX 2
712#define EXT4_OS_FREEBSD 3
713#define EXT4_OS_LITES 4
ac27a0ec
DK		 714
715/*
716 * Revision levels
717 */
617ba13b
MC		 718#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
719#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
ac27a0ec 720
617ba13b
MC		 721#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
722#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
ac27a0ec 723
617ba13b 724#define EXT4_GOOD_OLD_INODE_SIZE 128
ac27a0ec
DK		 725
726/*
727 * Feature set definitions
728 */
729
617ba13b 730#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
3a06d778 731 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
617ba13b 732#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
3a06d778 733 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
617ba13b 734#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
3a06d778 735 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
617ba13b
MC		 736#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
737 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
738#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
739 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
740#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
741 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
742#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
743 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
744#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
745 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
746#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
747 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
748
749#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
750#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
751#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
752#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
753#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
754#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
755
756#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
757#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
758#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
0fc1b451 759#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
717d50e4 760#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
f8628a14 761#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
ef7f3835 762#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
617ba13b
MC		 763
764#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
765#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
766#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
767#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
768#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
a86c6181 769#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
bd81d8ee 770#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
0fc1b451 771#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
ce421581 772#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
617ba13b
MC		 773
774#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
775#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
776 EXT4_FEATURE_INCOMPAT_RECOVER| \
a86c6181 777 EXT4_FEATURE_INCOMPAT_META_BG| \
bd81d8ee 778 EXT4_FEATURE_INCOMPAT_EXTENTS| \
ce421581
JS		 779 EXT4_FEATURE_INCOMPAT_64BIT| \
780 EXT4_FEATURE_INCOMPAT_FLEX_BG)
617ba13b
MC		 781#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
782 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
717d50e4 783 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
f8628a14 784 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
ef7f3835 785 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
0fc1b451
AK		 786 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
787 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
ac27a0ec
DK		 788
789/*
790 * Default values for user and/or group using reserved blocks
791 */
617ba13b
MC		 792#define EXT4_DEF_RESUID 0
793#define EXT4_DEF_RESGID 0
ac27a0ec 794
240799cd
TT		 795#define EXT4_DEF_INODE_READAHEAD_BLKS 32
796
ac27a0ec
DK		 797/*
798 * Default mount options
799 */
617ba13b
MC		 800#define EXT4_DEFM_DEBUG 0x0001
801#define EXT4_DEFM_BSDGROUPS 0x0002
802#define EXT4_DEFM_XATTR_USER 0x0004
803#define EXT4_DEFM_ACL 0x0008
804#define EXT4_DEFM_UID16 0x0010
805#define EXT4_DEFM_JMODE 0x0060
806#define EXT4_DEFM_JMODE_DATA 0x0020
807#define EXT4_DEFM_JMODE_ORDERED 0x0040
808#define EXT4_DEFM_JMODE_WBACK 0x0060
ac27a0ec 809
30773840
TT		 810/*
811 * Default journal batch times
812 */
813#define EXT4_DEF_MIN_BATCH_TIME 0
814#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
815
ac27a0ec
DK		 816/*
817 * Structure of a directory entry
818 */
617ba13b 819#define EXT4_NAME_LEN 255
ac27a0ec 820
617ba13b 821struct ext4_dir_entry {
ac27a0ec
DK		 822 __le32 inode; /* Inode number */
823 __le16 rec_len; /* Directory entry length */
824 __le16 name_len; /* Name length */
617ba13b 825 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 826};
827
828/*
617ba13b 829 * The new version of the directory entry. Since EXT4 structures are
ac27a0ec
DK		 830 * stored in intel byte order, and the name_len field could never be
831 * bigger than 255 chars, it's safe to reclaim the extra byte for the
832 * file_type field.
833 */
617ba13b 834struct ext4_dir_entry_2 {
ac27a0ec
DK		 835 __le32 inode; /* Inode number */
836 __le16 rec_len; /* Directory entry length */
837 __u8 name_len; /* Name length */
838 __u8 file_type;
617ba13b 839 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 840};
841
842/*
617ba13b 843 * Ext4 directory file types. Only the low 3 bits are used. The
ac27a0ec
DK		 844 * other bits are reserved for now.
845 */
617ba13b
MC		 846#define EXT4_FT_UNKNOWN 0
847#define EXT4_FT_REG_FILE 1
848#define EXT4_FT_DIR 2
849#define EXT4_FT_CHRDEV 3
850#define EXT4_FT_BLKDEV 4
851#define EXT4_FT_FIFO 5
852#define EXT4_FT_SOCK 6
853#define EXT4_FT_SYMLINK 7
ac27a0ec 854
617ba13b 855#define EXT4_FT_MAX 8
ac27a0ec
DK		 856
857/*
617ba13b 858 * EXT4_DIR_PAD defines the directory entries boundaries
ac27a0ec
DK		 859 *
860 * NOTE: It must be a multiple of 4
861 */
617ba13b
MC		 862#define EXT4_DIR_PAD 4
863#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
864#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
865 ~EXT4_DIR_ROUND)
a72d7f83
JK		 866#define EXT4_MAX_REC_LEN ((1<<16)-1)
867
868static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
869{
870 unsigned len = le16_to_cpu(dlen);
871
7be2baaa 872 if (len == EXT4_MAX_REC_LEN || len == 0)
a72d7f83
JK		 873 return 1 << 16;
874 return len;
875}
876
877static inline __le16 ext4_rec_len_to_disk(unsigned len)
878{
879 if (len == (1 << 16))
880 return cpu_to_le16(EXT4_MAX_REC_LEN);
881 else if (len > (1 << 16))
882 BUG();
883 return cpu_to_le16(len);
884}
885
ac27a0ec
DK		 886/*
887 * Hash Tree Directory indexing
888 * (c) Daniel Phillips, 2001
889 */
890
4074fe37
ES		 891#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
892 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
617ba13b
MC		 893 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
894#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
895#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
ac27a0ec
DK		 896
897/* Legal values for the dx_root hash_version field: */
898
899#define DX_HASH_LEGACY 0
900#define DX_HASH_HALF_MD4 1
901#define DX_HASH_TEA 2
f99b2589
TT		 902#define DX_HASH_LEGACY_UNSIGNED 3
903#define DX_HASH_HALF_MD4_UNSIGNED 4
904#define DX_HASH_TEA_UNSIGNED 5
ac27a0ec
DK		 905
906#ifdef __KERNEL__
907
908/* hash info structure used by the directory hash */
909struct dx_hash_info
910{
911 u32 hash;
912 u32 minor_hash;
913 int hash_version;
914 u32 *seed;
915};
916
617ba13b 917#define EXT4_HTREE_EOF 0x7fffffff
ac27a0ec
DK		 918
919/*
617ba13b 920 * Control parameters used by ext4_htree_next_block
ac27a0ec
DK		 921 */
922#define HASH_NB_ALWAYS 1
923
924
925/*
926 * Describe an inode's exact location on disk and in memory
927 */
617ba13b 928struct ext4_iloc
ac27a0ec
DK		 929{
930 struct buffer_head *bh;
931 unsigned long offset;
fd2d4291 932 ext4_group_t block_group;
ac27a0ec
DK		 933};
934
617ba13b 935static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
ac27a0ec 936{
617ba13b 937 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
ac27a0ec
DK		 938}
939
940/*
941 * This structure is stuffed into the struct file's private_data field
942 * for directories. It is where we put information so that we can do
943 * readdir operations in hash tree order.
944 */
945struct dir_private_info {
946 struct rb_root root;
947 struct rb_node *curr_node;
948 struct fname *extra_fname;
949 loff_t last_pos;
950 __u32 curr_hash;
951 __u32 curr_minor_hash;
952 __u32 next_hash;
953};
954
955/* calculate the first block number of the group */
617ba13b 956static inline ext4_fsblk_t
fd2d4291 957ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
ac27a0ec 958{
617ba13b
MC		 959 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
960 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
ac27a0ec
DK		 961}
962
963/*
964 * Special error return code only used by dx_probe() and its callers.
965 */
966#define ERR_BAD_DX_DIR -75000
967
72b64b59 968void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
a9df9a49 969 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
3a5b2ecd 970
9f6200bb
TT		 971extern struct proc_dir_entry *ext4_proc_root;
972
5e8814f2
TT		 973#ifdef CONFIG_PROC_FS
974extern const struct file_operations ext4_ui_proc_fops;
975
976#define EXT4_PROC_HANDLER(name, var) \
977do { \
978 proc = proc_create_data(name, mode, sbi->s_proc, \
979 &ext4_ui_proc_fops, &sbi->s_##var); \
980 if (proc == NULL) { \
981 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
982 goto err_out; \
983 } \
984} while (0)
985#else
986#define EXT4_PROC_HANDLER(name, var)
987#endif
988
ac27a0ec
DK		 989/*
990 * Function prototypes
991 */
992
993/*
994 * Ok, these declarations are also in <linux/kernel.h> but none of the
617ba13b 995 * ext4 source programs needs to include it so they are duplicated here.
ac27a0ec 996 */
8c55e204
DK		 997# define NORET_TYPE /**/
998# define ATTRIB_NORET __attribute__((noreturn))
999# define NORET_AND noreturn,
ac27a0ec 1000
498e5f24
TT		 1001/* bitmap.c */
1002extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1003
ac27a0ec 1004/* balloc.c */
3a5b2ecd
MC		 1005extern unsigned int ext4_block_group(struct super_block *sb,
1006 ext4_fsblk_t blocknr);
1007extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1008 ext4_fsblk_t blocknr);
fd2d4291
AM		 1009extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1010extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1011 ext4_group_t group);
7061eba7 1012extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
617ba13b 1013 ext4_fsblk_t goal, unsigned long *count, int *errp);
5c791616 1014extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
8c3bf8a0 1015extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
af5bc92d 1016extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
c9de560d 1017 ext4_fsblk_t block, unsigned long count, int metadata);
e21675d4
AK		 1018extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1019 ext4_fsblk_t block, unsigned long count);
af5bc92d
TT		 1020extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1021extern void ext4_check_blocks_bitmap(struct super_block *);
617ba13b 1022extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
fd2d4291 1023 ext4_group_t block_group,
ac27a0ec 1024 struct buffer_head ** bh);
617ba13b 1025extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
ac27a0ec
DK		 1026
1027/* dir.c */
617ba13b
MC		 1028extern int ext4_check_dir_entry(const char *, struct inode *,
1029 struct ext4_dir_entry_2 *,
498e5f24 1030 struct buffer_head *, unsigned int);
617ba13b 1031extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
ac27a0ec 1032 __u32 minor_hash,
617ba13b
MC		 1033 struct ext4_dir_entry_2 *dirent);
1034extern void ext4_htree_free_dir_info(struct dir_private_info *p);
ac27a0ec
DK		 1035
1036/* fsync.c */
af5bc92d 1037extern int ext4_sync_file(struct file *, struct dentry *, int);
ac27a0ec
DK		 1038
1039/* hash.c */
617ba13b 1040extern int ext4fs_dirhash(const char *name, int len, struct
ac27a0ec
DK		 1041 dx_hash_info *hinfo);
1042
1043/* ialloc.c */
af5bc92d
TT		 1044extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1045extern void ext4_free_inode(handle_t *, struct inode *);
1046extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1047extern unsigned long ext4_count_free_inodes(struct super_block *);
1048extern unsigned long ext4_count_dirs(struct super_block *);
1049extern void ext4_check_inodes_bitmap(struct super_block *);
ac27a0ec 1050
c9de560d
AT		 1051/* mballoc.c */
1052extern long ext4_mb_stats;
1053extern long ext4_mb_max_to_scan;
1054extern int ext4_mb_init(struct super_block *, int);
1055extern int ext4_mb_release(struct super_block *);
1056extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1057 struct ext4_allocation_request *, int *);
1058extern int ext4_mb_reserve_blocks(struct super_block *, int);
c2ea3fde 1059extern void ext4_discard_preallocations(struct inode *);
c9de560d
AT		 1060extern int __init init_ext4_mballoc(void);
1061extern void exit_ext4_mballoc(void);
1062extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1063 unsigned long, unsigned long, int, unsigned long *);
920313a7 1064extern int ext4_mb_add_groupinfo(struct super_block *sb,
5f21b0e6
FB		 1065 ext4_group_t i, struct ext4_group_desc *desc);
1066extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1067 ext4_grpblk_t add);
920313a7
AK		 1068extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1069extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1070 ext4_group_t, int);
ac27a0ec 1071/* inode.c */
617ba13b
MC		 1072int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1073 struct buffer_head *bh, ext4_fsblk_t blocknr);
725d26d3
AK		 1074struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1075 ext4_lblk_t, int, int *);
1076struct buffer_head *ext4_bread(handle_t *, struct inode *,
1077 ext4_lblk_t, int, int *);
6873fa0d
ES		 1078int ext4_get_block(struct inode *inode, sector_t iblock,
1079 struct buffer_head *bh_result, int create);
ac27a0ec 1080
1d1fe1ee 1081extern struct inode *ext4_iget(struct super_block *, unsigned long);
af5bc92d
TT		 1082extern int ext4_write_inode(struct inode *, int);
1083extern int ext4_setattr(struct dentry *, struct iattr *);
3e3398a0
MC		 1084extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1085 struct kstat *stat);
af5bc92d
TT		 1086extern void ext4_delete_inode(struct inode *);
1087extern int ext4_sync_inode(handle_t *, struct inode *);
617ba13b
MC		 1088extern void ext4_dirty_inode(struct inode *);
1089extern int ext4_change_inode_journal_flag(struct inode *, int);
1090extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
91ef4caf 1091extern int ext4_can_truncate(struct inode *inode);
af5bc92d 1092extern void ext4_truncate(struct inode *);
617ba13b 1093extern void ext4_set_inode_flags(struct inode *);
ff9ddf7e 1094extern void ext4_get_inode_flags(struct ext4_inode_info *);
617ba13b 1095extern void ext4_set_aops(struct inode *inode);
a86c6181 1096extern int ext4_writepage_trans_blocks(struct inode *);
a02908f1 1097extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
f3bd1f3f 1098extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
cf108bca 1099extern int ext4_block_truncate_page(handle_t *handle,
a86c6181 1100 struct address_space *mapping, loff_t from);
2e9ee850 1101extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
60e58e0f 1102extern qsize_t ext4_get_reserved_space(struct inode *inode);
ac27a0ec
DK		 1103
1104/* ioctl.c */
5cdd7b2d 1105extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
af5bc92d 1106extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
ac27a0ec 1107
c14c6fd5 1108/* migrate.c */
2a43a878 1109extern int ext4_ext_migrate(struct inode *);
ac27a0ec 1110/* namei.c */
617ba13b
MC		 1111extern int ext4_orphan_add(handle_t *, struct inode *);
1112extern int ext4_orphan_del(handle_t *, struct inode *);
1113extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
ac27a0ec
DK		 1114 __u32 start_minor_hash, __u32 *next_hash);
1115
1116/* resize.c */
617ba13b
MC		 1117extern int ext4_group_add(struct super_block *sb,
1118 struct ext4_new_group_data *input);
1119extern int ext4_group_extend(struct super_block *sb,
1120 struct ext4_super_block *es,
1121 ext4_fsblk_t n_blocks_count);
ac27a0ec
DK		 1122
1123/* super.c */
af5bc92d 1124extern void ext4_error(struct super_block *, const char *, const char *, ...)
ac27a0ec 1125 __attribute__ ((format (printf, 3, 4)));
af5bc92d
TT		 1126extern void __ext4_std_error(struct super_block *, const char *, int);
1127extern void ext4_abort(struct super_block *, const char *, const char *, ...)
ac27a0ec 1128 __attribute__ ((format (printf, 3, 4)));
af5bc92d 1129extern void ext4_warning(struct super_block *, const char *, const char *, ...)
ac27a0ec 1130 __attribute__ ((format (printf, 3, 4)));
5d1b1b3f
AK		 1131extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1132 const char *, const char *, ...)
1133 __attribute__ ((format (printf, 4, 5)));
af5bc92d 1134extern void ext4_update_dynamic_rev(struct super_block *sb);
99e6f829
AK		 1135extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1136 __u32 compat);
1137extern int ext4_update_rocompat_feature(handle_t *handle,
1138 struct super_block *sb, __u32 rocompat);
1139extern int ext4_update_incompat_feature(handle_t *handle,
1140 struct super_block *sb, __u32 incompat);
8fadc143
AR		 1141extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1142 struct ext4_group_desc *bg);
1143extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1144 struct ext4_group_desc *bg);
1145extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1146 struct ext4_group_desc *bg);
560671a0
AK		 1147extern __u32 ext4_free_blks_count(struct super_block *sb,
1148 struct ext4_group_desc *bg);
1149extern __u32 ext4_free_inodes_count(struct super_block *sb,
1150 struct ext4_group_desc *bg);
1151extern __u32 ext4_used_dirs_count(struct super_block *sb,
1152 struct ext4_group_desc *bg);
1153extern __u32 ext4_itable_unused_count(struct super_block *sb,
1154 struct ext4_group_desc *bg);
8fadc143
AR		 1155extern void ext4_block_bitmap_set(struct super_block *sb,
1156 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1157extern void ext4_inode_bitmap_set(struct super_block *sb,
1158 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1159extern void ext4_inode_table_set(struct super_block *sb,
1160 struct ext4_group_desc *bg, ext4_fsblk_t blk);
560671a0
AK		 1161extern void ext4_free_blks_set(struct super_block *sb,
1162 struct ext4_group_desc *bg, __u32 count);
1163extern void ext4_free_inodes_set(struct super_block *sb,
1164 struct ext4_group_desc *bg, __u32 count);
1165extern void ext4_used_dirs_set(struct super_block *sb,
1166 struct ext4_group_desc *bg, __u32 count);
1167extern void ext4_itable_unused_set(struct super_block *sb,
1168 struct ext4_group_desc *bg, __u32 count);
bd81d8ee
LV		 1169
1170static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1171{
1172 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
6bc9feff 1173 le32_to_cpu(es->s_blocks_count_lo);
bd81d8ee
LV		 1174}
1175
1176static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1177{
1178 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
308ba3ec 1179 le32_to_cpu(es->s_r_blocks_count_lo);
bd81d8ee
LV		 1180}
1181
1182static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1183{
1184 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
308ba3ec 1185 le32_to_cpu(es->s_free_blocks_count_lo);
bd81d8ee
LV		 1186}
1187
1188static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1189 ext4_fsblk_t blk)
1190{
6bc9feff 1191 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1192 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1193}
1194
1195static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1196 ext4_fsblk_t blk)
1197{
308ba3ec 1198 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1199 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1200}
1201
1202static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1203 ext4_fsblk_t blk)
1204{
308ba3ec 1205 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1206 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1207}
1208
a48380f7
AK		 1209static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1210{
06a279d6
TT		 1211 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1212 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1213 le32_to_cpu(raw_inode->i_size_lo);
1214 else
1215 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
a48380f7 1216}
bd81d8ee 1217
a48380f7
AK		 1218static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1219{
1220 raw_inode->i_size_lo = cpu_to_le32(i_size);
1221 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1222}
ac27a0ec 1223
c9de560d
AT		 1224static inline
1225struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
af5bc92d 1226 ext4_group_t group)
c9de560d
AT		 1227{
1228 struct ext4_group_info ***grp_info;
1229 long indexv, indexh;
1230 grp_info = EXT4_SB(sb)->s_group_info;
1231 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1232 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1233 return grp_info[indexv][indexh];
1234}
1235
1236
772cb7c8
JS		 1237static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1238 ext4_group_t block_group)
1239{
1240 return block_group >> sbi->s_log_groups_per_flex;
1241}
1242
1243static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1244{
1245 return 1 << sbi->s_log_groups_per_flex;
1246}
1247
617ba13b 1248#define ext4_std_error(sb, errno) \
ac27a0ec
DK		 1249do { \
1250 if ((errno)) \
4db9c54a 1251 __ext4_std_error((sb), __func__, (errno)); \
ac27a0ec
DK		 1252} while (0)
1253
a30d542a 1254#ifdef CONFIG_SMP
179f7ebf 1255/* Each CPU can accumulate percpu_counter_batch blocks in their local
a30d542a 1256 * counters. So we need to make sure we have free blocks more
179f7ebf 1257 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
a30d542a 1258 */
179f7ebf 1259#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
a30d542a
AK		 1260#else
1261#define EXT4_FREEBLOCKS_WATERMARK 0
1262#endif
1263
cf17fea6
AK		 1264static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1265{
1266 /*
1267 * XXX: replace with spinlock if seen contended -bzzz
1268 */
1269 down_write(&EXT4_I(inode)->i_data_sem);
1270 if (newsize > EXT4_I(inode)->i_disksize)
1271 EXT4_I(inode)->i_disksize = newsize;
1272 up_write(&EXT4_I(inode)->i_data_sem);
1273 return ;
1274}
a30d542a 1275
5d1b1b3f
AK		 1276struct ext4_group_info {
1277 unsigned long bb_state;
1278 struct rb_root bb_free_root;
1279 unsigned short bb_first_free;
1280 unsigned short bb_free;
1281 unsigned short bb_fragments;
1282 struct list_head bb_prealloc_list;
1283#ifdef DOUBLE_CHECK
1284 void *bb_bitmap;
1285#endif
1286 struct rw_semaphore alloc_sem;
1287 unsigned short bb_counters[];
1288};
1289
1290#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1291#define EXT4_GROUP_INFO_LOCKED_BIT 1
1292
1293#define EXT4_MB_GRP_NEED_INIT(grp) \
1294 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1295
1296static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1297{
1298 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1299
1300 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1301}
1302
1303static inline void ext4_unlock_group(struct super_block *sb,
1304 ext4_group_t group)
1305{
1306 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1307
1308 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1309}
1310
1311static inline int ext4_is_group_locked(struct super_block *sb,
1312 ext4_group_t group)
1313{
1314 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1315
1316 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1317 &(grinfo->bb_state));
1318}
1319
ac27a0ec
DK		 1320/*
1321 * Inodes and files operations
1322 */
1323
1324/* dir.c */
617ba13b 1325extern const struct file_operations ext4_dir_operations;
ac27a0ec
DK		 1326
1327/* file.c */
c5ef1c42 1328extern const struct inode_operations ext4_file_inode_operations;
617ba13b 1329extern const struct file_operations ext4_file_operations;
ac27a0ec
DK		 1330
1331/* namei.c */
c5ef1c42
AV		 1332extern const struct inode_operations ext4_dir_inode_operations;
1333extern const struct inode_operations ext4_special_inode_operations;
ac27a0ec
DK		 1334
1335/* symlink.c */
c5ef1c42
AV		 1336extern const struct inode_operations ext4_symlink_inode_operations;
1337extern const struct inode_operations ext4_fast_symlink_inode_operations;
ac27a0ec 1338
a86c6181
AT		 1339/* extents.c */
1340extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1341extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
a02908f1
MC		 1342extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1343 int chunk);
a86c6181 1344extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
498e5f24
TT		 1345 ext4_lblk_t iblock, unsigned int max_blocks,
1346 struct buffer_head *bh_result,
1347 int create, int extend_disksize);
cf108bca 1348extern void ext4_ext_truncate(struct inode *);
a86c6181
AT		 1349extern void ext4_ext_init(struct super_block *);
1350extern void ext4_ext_release(struct super_block *);
a2df2a63
AA		 1351extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1352 loff_t len);
0e855ac8 1353extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
498e5f24 1354 sector_t block, unsigned int max_blocks,
0e855ac8 1355 struct buffer_head *bh, int create,
d2a17637 1356 int extend_disksize, int flag);
3a06d778
AK		 1357extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1358 __u64 start, __u64 len);
1359
2ccb5fb9
AK		 1360/*
1361 * Add new method to test wether block and inode bitmaps are properly
1362 * initialized. With uninit_bg reading the block from disk is not enough
1363 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1364 */
1365#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1366
1367static inline int bitmap_uptodate(struct buffer_head *bh)
1368{
1369 return (buffer_uptodate(bh) &&
1370 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1371}
1372static inline void set_bitmap_uptodate(struct buffer_head *bh)
1373{
1374 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1375}
1376
ac27a0ec
DK		 1377#endif /* __KERNEL__ */
1378
3dcf5451 1379#endif /* _EXT4_H */
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