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ext4: allocate ->s_blockgroup_lock separately
[linux-2.6-block.git] / fs / ext4 / ext4.h
CommitLineData
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 34
ac27a0ec
DK		 35/*
36 * Debug code
37 */
617ba13b
MC		 38#ifdef EXT4FS_DEBUG
39#define ext4_debug(f, a...) \
ac27a0ec 40 do { \
af5bc92d 41 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
4db9c54a 42 __FILE__, __LINE__, __func__); \
af5bc92d 43 printk(KERN_DEBUG f, ## a); \
ac27a0ec
DK		 44 } while (0)
45#else
617ba13b 46#define ext4_debug(f, a...) do {} while (0)
ac27a0ec
DK		 47#endif
48
c9de560d
AT		 49/* prefer goal again. length */
50#define EXT4_MB_HINT_MERGE 1
51/* blocks already reserved */
52#define EXT4_MB_HINT_RESERVED 2
53/* metadata is being allocated */
54#define EXT4_MB_HINT_METADATA 4
55/* first blocks in the file */
56#define EXT4_MB_HINT_FIRST 8
57/* search for the best chunk */
58#define EXT4_MB_HINT_BEST 16
59/* data is being allocated */
60#define EXT4_MB_HINT_DATA 32
61/* don't preallocate (for tails) */
62#define EXT4_MB_HINT_NOPREALLOC 64
63/* allocate for locality group */
64#define EXT4_MB_HINT_GROUP_ALLOC 128
65/* allocate goal blocks or none */
66#define EXT4_MB_HINT_GOAL_ONLY 256
67/* goal is meaningful */
68#define EXT4_MB_HINT_TRY_GOAL 512
d2a17637
MC		 69/* blocks already pre-reserved by delayed allocation */
70#define EXT4_MB_DELALLOC_RESERVED 1024
71
c9de560d
AT		 72
73struct ext4_allocation_request {
74 /* target inode for block we're allocating */
75 struct inode *inode;
76 /* logical block in target inode */
77 ext4_lblk_t logical;
78 /* phys. target (a hint) */
79 ext4_fsblk_t goal;
80 /* the closest logical allocated block to the left */
81 ext4_lblk_t lleft;
82 /* phys. block for ^^^ */
83 ext4_fsblk_t pleft;
84 /* the closest logical allocated block to the right */
85 ext4_lblk_t lright;
86 /* phys. block for ^^^ */
87 ext4_fsblk_t pright;
88 /* how many blocks we want to allocate */
498e5f24 89 unsigned int len;
c9de560d 90 /* flags. see above EXT4_MB_HINT_* */
498e5f24 91 unsigned int flags;
c9de560d
AT		 92};
93
ac27a0ec
DK		 94/*
95 * Special inodes numbers
96 */
617ba13b
MC		 97#define EXT4_BAD_INO 1 /* Bad blocks inode */
98#define EXT4_ROOT_INO 2 /* Root inode */
99#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
100#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
101#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
102#define EXT4_JOURNAL_INO 8 /* Journal inode */
ac27a0ec 103
617ba13b
MC		 104/* First non-reserved inode for old ext4 filesystems */
105#define EXT4_GOOD_OLD_FIRST_INO 11
ac27a0ec
DK		 106
107/*
108 * Maximal count of links to a file
109 */
f8628a14 110#define EXT4_LINK_MAX 65000
ac27a0ec
DK		 111
112/*
113 * Macro-instructions used to manage several block sizes
114 */
617ba13b 115#define EXT4_MIN_BLOCK_SIZE 1024
afc7cbca
TS		 116#define EXT4_MAX_BLOCK_SIZE 65536
117#define EXT4_MIN_BLOCK_LOG_SIZE 10
ac27a0ec 118#ifdef __KERNEL__
617ba13b 119# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
ac27a0ec 120#else
617ba13b 121# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
ac27a0ec 122#endif
af5bc92d 123#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
ac27a0ec 124#ifdef __KERNEL__
617ba13b 125# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
ac27a0ec 126#else
617ba13b 127# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
ac27a0ec
DK		 128#endif
129#ifdef __KERNEL__
617ba13b
MC		 130#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
131#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
132#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
ac27a0ec 133#else
617ba13b
MC		 134#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
135 EXT4_GOOD_OLD_INODE_SIZE : \
ac27a0ec 136 (s)->s_inode_size)
617ba13b
MC		 137#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
138 EXT4_GOOD_OLD_FIRST_INO : \
ac27a0ec
DK		 139 (s)->s_first_ino)
140#endif
a2df2a63 141#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
ac27a0ec 142
ac27a0ec
DK		 143/*
144 * Structure of a blocks group descriptor
145 */
617ba13b 146struct ext4_group_desc
ac27a0ec 147{
3a14589c 148 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
5272f837
AK		 149 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
150 __le32 bg_inode_table_lo; /* Inodes table block */
560671a0
AK		 151 __le16 bg_free_blocks_count_lo;/* Free blocks count */
152 __le16 bg_free_inodes_count_lo;/* Free inodes count */
153 __le16 bg_used_dirs_count_lo; /* Directories count */
717d50e4
AD		 154 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
155 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
560671a0 156 __le16 bg_itable_unused_lo; /* Unused inodes count */
717d50e4 157 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
8fadc143
AR		 158 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
159 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
160 __le32 bg_inode_table_hi; /* Inodes table block MSB */
91b51a01
CL		 161 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
162 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
163 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
560671a0 164 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
91b51a01 165 __u32 bg_reserved2[3];
ac27a0ec
DK		 166};
167
772cb7c8
JS		 168/*
169 * Structure of a flex block group info
170 */
171
172struct flex_groups {
173 __u32 free_inodes;
174 __u32 free_blocks;
175};
176
717d50e4
AD		 177#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
178#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
179#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
180
bd81d8ee 181#ifdef __KERNEL__
3dcf5451 182#include "ext4_sb.h"
bd81d8ee 183#endif
ac27a0ec
DK		 184/*
185 * Macro-instructions used to manage group descriptors
186 */
0d1ee42f 187#define EXT4_MIN_DESC_SIZE 32
8fadc143 188#define EXT4_MIN_DESC_SIZE_64BIT 64
0d1ee42f
AR		 189#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
190#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
ac27a0ec 191#ifdef __KERNEL__
617ba13b
MC		 192# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
193# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
194# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
195# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
ac27a0ec 196#else
617ba13b 197# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
0d1ee42f 198# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
617ba13b 199# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
ac27a0ec
DK		 200#endif
201
202/*
203 * Constants relative to the data blocks
204 */
617ba13b
MC		 205#define EXT4_NDIR_BLOCKS 12
206#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
207#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
208#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
209#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
ac27a0ec
DK		 210
211/*
212 * Inode flags
213 */
617ba13b
MC		 214#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
215#define EXT4_UNRM_FL 0x00000002 /* Undelete */
216#define EXT4_COMPR_FL 0x00000004 /* Compress file */
217#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
218#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
219#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
220#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
221#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
ac27a0ec 222/* Reserved for compression usage... */
617ba13b
MC		 223#define EXT4_DIRTY_FL 0x00000100
224#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
225#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
226#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
ac27a0ec 227/* End compression flags --- maybe not all used */
617ba13b
MC		 228#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
229#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
230#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
231#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
232#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
233#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
8180a562 234#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
a86c6181 235#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
267e4db9 236#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
8180a562 237#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
ac27a0ec 238
a86c6181 239#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
4db46fc2 240#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
ac27a0ec
DK		 241
242/*
243 * Inode dynamic state flags
244 */
617ba13b
MC		 245#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
246#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
247#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
6dd4ee7c 248#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
ac27a0ec
DK		 249
250/* Used to pass group descriptor data when online resize is done */
617ba13b 251struct ext4_new_group_input {
8c55e204
DK		 252 __u32 group; /* Group number for this data */
253 __u64 block_bitmap; /* Absolute block number of block bitmap */
254 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
255 __u64 inode_table; /* Absolute block number of inode table start */
256 __u32 blocks_count; /* Total number of blocks in this group */
257 __u16 reserved_blocks; /* Number of reserved blocks in this group */
ac27a0ec
DK		 258 __u16 unused;
259};
260
617ba13b
MC		 261/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
262struct ext4_new_group_data {
ac27a0ec 263 __u32 group;
bd81d8ee
LV		 264 __u64 block_bitmap;
265 __u64 inode_bitmap;
266 __u64 inode_table;
ac27a0ec
DK		 267 __u32 blocks_count;
268 __u16 reserved_blocks;
269 __u16 unused;
270 __u32 free_blocks_count;
271};
272
a2df2a63
AA		 273/*
274 * Following is used by preallocation code to tell get_blocks() that we
275 * want uninitialzed extents.
276 */
277#define EXT4_CREATE_UNINITIALIZED_EXT 2
ac27a0ec
DK		 278
279/*
280 * ioctl commands
281 */
617ba13b
MC		 282#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
283#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
284#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
285#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
617ba13b
MC		 286#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
287#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
e23291b9 288#ifdef CONFIG_JBD2_DEBUG
617ba13b 289#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
ac27a0ec 290#endif
617ba13b
MC		 291#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
292#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
8eea80d5
TT		 293#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
294#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
295#define EXT4_IOC_MIGRATE _IO('f', 9)
296 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
ac27a0ec
DK		 297
298/*
299 * ioctl commands in 32 bit emulation
300 */
617ba13b
MC		 301#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
302#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
303#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
304#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
305#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
306#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
307#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
e23291b9 308#ifdef CONFIG_JBD2_DEBUG
617ba13b 309#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
ac27a0ec 310#endif
617ba13b
MC		 311#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
312#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
ac27a0ec
DK		 313
314
315/*
316 * Mount options
317 */
617ba13b 318struct ext4_mount_options {
ac27a0ec
DK		 319 unsigned long s_mount_opt;
320 uid_t s_resuid;
321 gid_t s_resgid;
322 unsigned long s_commit_interval;
30773840 323 u32 s_min_batch_time, s_max_batch_time;
ac27a0ec
DK		 324#ifdef CONFIG_QUOTA
325 int s_jquota_fmt;
326 char *s_qf_names[MAXQUOTAS];
327#endif
328};
329
330/*
331 * Structure of an inode on the disk
332 */
617ba13b 333struct ext4_inode {
ac27a0ec
DK		 334 __le16 i_mode; /* File mode */
335 __le16 i_uid; /* Low 16 bits of Owner Uid */
a48380f7 336 __le32 i_size_lo; /* Size in bytes */
ac27a0ec 337 __le32 i_atime; /* Access time */
ef7f3835 338 __le32 i_ctime; /* Inode Change time */
ac27a0ec
DK		 339 __le32 i_mtime; /* Modification time */
340 __le32 i_dtime; /* Deletion Time */
341 __le16 i_gid; /* Low 16 bits of Group Id */
342 __le16 i_links_count; /* Links count */
0fc1b451 343 __le32 i_blocks_lo; /* Blocks count */
ac27a0ec
DK		 344 __le32 i_flags; /* File flags */
345 union {
346 struct {
25ec56b5 347 __le32 l_i_version;
ac27a0ec
DK		 348 } linux1;
349 struct {
350 __u32 h_i_translator;
351 } hurd1;
352 struct {
353 __u32 m_i_reserved1;
354 } masix1;
355 } osd1; /* OS dependent 1 */
617ba13b 356 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
ac27a0ec 357 __le32 i_generation; /* File version (for NFS) */
7973c0c1 358 __le32 i_file_acl_lo; /* File ACL */
a48380f7 359 __le32 i_size_high;
f077d0d7 360 __le32 i_obso_faddr; /* Obsoleted fragment address */
ac27a0ec
DK		 361 union {
362 struct {
0fc1b451 363 __le16 l_i_blocks_high; /* were l_i_reserved1 */
a1ddeb7e 364 __le16 l_i_file_acl_high;
8c55e204 365 __le16 l_i_uid_high; /* these 2 fields */
ac27a0ec
DK		 366 __le16 l_i_gid_high; /* were reserved2[0] */
367 __u32 l_i_reserved2;
368 } linux2;
369 struct {
f077d0d7 370 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
ac27a0ec
DK		 371 __u16 h_i_mode_high;
372 __u16 h_i_uid_high;
373 __u16 h_i_gid_high;
374 __u32 h_i_author;
375 } hurd2;
376 struct {
f077d0d7 377 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
a1ddeb7e 378 __le16 m_i_file_acl_high;
ac27a0ec
DK		 379 __u32 m_i_reserved2[2];
380 } masix2;
381 } osd2; /* OS dependent 2 */
382 __le16 i_extra_isize;
383 __le16 i_pad1;
ef7f3835
KS		 384 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
385 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
386 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
387 __le32 i_crtime; /* File Creation time */
388 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
25ec56b5 389 __le32 i_version_hi; /* high 32 bits for 64-bit version */
ac27a0ec
DK		 390};
391
ac27a0ec 392
ef7f3835
KS		 393#define EXT4_EPOCH_BITS 2
394#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
395#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
396
397/*
398 * Extended fields will fit into an inode if the filesystem was formatted
399 * with large inodes (-I 256 or larger) and there are not currently any EAs
400 * consuming all of the available space. For new inodes we always reserve
401 * enough space for the kernel's known extended fields, but for inodes
402 * created with an old kernel this might not have been the case. None of
403 * the extended inode fields is critical for correct filesystem operation.
404 * This macro checks if a certain field fits in the inode. Note that
405 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
406 */
407#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
408 ((offsetof(typeof(*ext4_inode), field) + \
409 sizeof((ext4_inode)->field)) \
410 <= (EXT4_GOOD_OLD_INODE_SIZE + \
411 (einode)->i_extra_isize)) \
412
413static inline __le32 ext4_encode_extra_time(struct timespec *time)
414{
415 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
416 time->tv_sec >> 32 : 0) |
417 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
418}
419
420static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
421{
422 if (sizeof(time->tv_sec) > 4)
423 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
424 << 32;
425 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
426}
427
428#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
429do { \
430 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
431 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
432 (raw_inode)->xtime ## _extra = \
433 ext4_encode_extra_time(&(inode)->xtime); \
434} while (0)
435
436#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
437do { \
438 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
439 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
440 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
441 (raw_inode)->xtime ## _extra = \
442 ext4_encode_extra_time(&(einode)->xtime); \
443} while (0)
444
445#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
446do { \
447 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
448 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
449 ext4_decode_extra_time(&(inode)->xtime, \
450 raw_inode->xtime ## _extra); \
451} while (0)
452
453#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
454do { \
455 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
456 (einode)->xtime.tv_sec = \
457 (signed)le32_to_cpu((raw_inode)->xtime); \
458 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
459 ext4_decode_extra_time(&(einode)->xtime, \
460 raw_inode->xtime ## _extra); \
461} while (0)
462
25ec56b5
JNC		 463#define i_disk_version osd1.linux1.l_i_version
464
ac27a0ec
DK		 465#if defined(__KERNEL__) || defined(__linux__)
466#define i_reserved1 osd1.linux1.l_i_reserved1
a1ddeb7e 467#define i_file_acl_high osd2.linux2.l_i_file_acl_high
0fc1b451 468#define i_blocks_high osd2.linux2.l_i_blocks_high
ac27a0ec
DK		 469#define i_uid_low i_uid
470#define i_gid_low i_gid
471#define i_uid_high osd2.linux2.l_i_uid_high
472#define i_gid_high osd2.linux2.l_i_gid_high
473#define i_reserved2 osd2.linux2.l_i_reserved2
474
475#elif defined(__GNU__)
476
477#define i_translator osd1.hurd1.h_i_translator
ac27a0ec
DK		 478#define i_uid_high osd2.hurd2.h_i_uid_high
479#define i_gid_high osd2.hurd2.h_i_gid_high
480#define i_author osd2.hurd2.h_i_author
481
482#elif defined(__masix__)
483
484#define i_reserved1 osd1.masix1.m_i_reserved1
a1ddeb7e 485#define i_file_acl_high osd2.masix2.m_i_file_acl_high
ac27a0ec
DK		 486#define i_reserved2 osd2.masix2.m_i_reserved2
487
488#endif /* defined(__KERNEL__) || defined(__linux__) */
489
490/*
491 * File system states
492 */
617ba13b
MC		 493#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
494#define EXT4_ERROR_FS 0x0002 /* Errors detected */
495#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
ac27a0ec 496
469108ff
TT		 497/*
498 * Misc. filesystem flags
499 */
500#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
501#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
502#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
503
ac27a0ec
DK		 504/*
505 * Mount flags
506 */
617ba13b
MC		 507#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
508#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
509#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
510#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
511#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
512#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
513#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
514#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
515#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
516#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
517#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
518#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
519#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
520#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
521#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
522#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
523#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
524#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
525#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
526#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
527#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
528#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
529#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
818d276c
GS		 530#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
531#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
25ec56b5 532#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
64769240 533#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
5bf5683a
HK		 534#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
535
617ba13b 536/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
ac27a0ec 537#ifndef _LINUX_EXT2_FS_H
617ba13b
MC		 538#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
539#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
540#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
541 EXT4_MOUNT_##opt)
ac27a0ec 542#else
617ba13b
MC		 543#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
544#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
545#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
ac27a0ec
DK		 546#endif
547
617ba13b
MC		 548#define ext4_set_bit ext2_set_bit
549#define ext4_set_bit_atomic ext2_set_bit_atomic
550#define ext4_clear_bit ext2_clear_bit
551#define ext4_clear_bit_atomic ext2_clear_bit_atomic
552#define ext4_test_bit ext2_test_bit
553#define ext4_find_first_zero_bit ext2_find_first_zero_bit
554#define ext4_find_next_zero_bit ext2_find_next_zero_bit
aa02ad67 555#define ext4_find_next_bit ext2_find_next_bit
ac27a0ec
DK		 556
557/*
558 * Maximal mount counts between two filesystem checks
559 */
617ba13b
MC		 560#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
561#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
ac27a0ec
DK		 562
563/*
564 * Behaviour when detecting errors
565 */
617ba13b
MC		 566#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
567#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
568#define EXT4_ERRORS_PANIC 3 /* Panic */
569#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
ac27a0ec
DK		 570
571/*
572 * Structure of the super block
573 */
617ba13b 574struct ext4_super_block {
ac27a0ec 575/*00*/ __le32 s_inodes_count; /* Inodes count */
6bc9feff 576 __le32 s_blocks_count_lo; /* Blocks count */
308ba3ec
AK		 577 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
578 __le32 s_free_blocks_count_lo; /* Free blocks count */
ac27a0ec
DK		 579/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
580 __le32 s_first_data_block; /* First Data Block */
581 __le32 s_log_block_size; /* Block size */
f077d0d7 582 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
ac27a0ec 583/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
f077d0d7 584 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
ac27a0ec
DK		 585 __le32 s_inodes_per_group; /* # Inodes per group */
586 __le32 s_mtime; /* Mount time */
587/*30*/ __le32 s_wtime; /* Write time */
588 __le16 s_mnt_count; /* Mount count */
589 __le16 s_max_mnt_count; /* Maximal mount count */
590 __le16 s_magic; /* Magic signature */
591 __le16 s_state; /* File system state */
592 __le16 s_errors; /* Behaviour when detecting errors */
593 __le16 s_minor_rev_level; /* minor revision level */
594/*40*/ __le32 s_lastcheck; /* time of last check */
595 __le32 s_checkinterval; /* max. time between checks */
596 __le32 s_creator_os; /* OS */
597 __le32 s_rev_level; /* Revision level */
598/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
599 __le16 s_def_resgid; /* Default gid for reserved blocks */
600 /*
617ba13b 601 * These fields are for EXT4_DYNAMIC_REV superblocks only.
ac27a0ec
DK		 602 *
603 * Note: the difference between the compatible feature set and
604 * the incompatible feature set is that if there is a bit set
605 * in the incompatible feature set that the kernel doesn't
606 * know about, it should refuse to mount the filesystem.
607 *
608 * e2fsck's requirements are more strict; if it doesn't know
609 * about a feature in either the compatible or incompatible
610 * feature set, it must abort and not try to meddle with
611 * things it doesn't understand...
612 */
613 __le32 s_first_ino; /* First non-reserved inode */
0d1ee42f 614 __le16 s_inode_size; /* size of inode structure */
ac27a0ec
DK		 615 __le16 s_block_group_nr; /* block group # of this superblock */
616 __le32 s_feature_compat; /* compatible feature set */
617/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
618 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
619/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
620/*78*/ char s_volume_name[16]; /* volume name */
621/*88*/ char s_last_mounted[64]; /* directory where last mounted */
622/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
623 /*
624 * Performance hints. Directory preallocation should only
617ba13b 625 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
ac27a0ec
DK		 626 */
627 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
628 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
629 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
630 /*
617ba13b 631 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
ac27a0ec
DK		 632 */
633/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
634/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
635 __le32 s_journal_dev; /* device number of journal file */
636 __le32 s_last_orphan; /* start of list of inodes to delete */
637 __le32 s_hash_seed[4]; /* HTREE hash seed */
638 __u8 s_def_hash_version; /* Default hash version to use */
639 __u8 s_reserved_char_pad;
0d1ee42f 640 __le16 s_desc_size; /* size of group descriptor */
bd81d8ee 641/*100*/ __le32 s_default_mount_opts;
ac27a0ec 642 __le32 s_first_meta_bg; /* First metablock block group */
bd81d8ee
LV		 643 __le32 s_mkfs_time; /* When the filesystem was created */
644 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
645 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
646/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
647 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
648 __le32 s_free_blocks_count_hi; /* Free blocks count */
c1bddad9
AK		 649 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
650 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
651 __le32 s_flags; /* Miscellaneous flags */
652 __le16 s_raid_stride; /* RAID stride */
653 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
654 __le64 s_mmp_block; /* Block for multi-mount protection */
655 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
772cb7c8
JS		 656 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
657 __u8 s_reserved_char_pad2;
658 __le16 s_reserved_pad;
659 __u32 s_reserved[162]; /* Padding to the end of the block */
ac27a0ec
DK		 660};
661
662#ifdef __KERNEL__
af5bc92d 663static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
ac27a0ec
DK		 664{
665 return sb->s_fs_info;
666}
617ba13b 667static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
ac27a0ec 668{
617ba13b 669 return container_of(inode, struct ext4_inode_info, vfs_inode);
ac27a0ec
DK		 670}
671
ef7f3835
KS		 672static inline struct timespec ext4_current_time(struct inode *inode)
673{
674 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
675 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
676}
677
678
617ba13b 679static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
ac27a0ec 680{
617ba13b
MC		 681 return ino == EXT4_ROOT_INO ||
682 ino == EXT4_JOURNAL_INO ||
683 ino == EXT4_RESIZE_INO ||
684 (ino >= EXT4_FIRST_INO(sb) &&
685 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
ac27a0ec
DK		 686}
687#else
617ba13b 688/* Assume that user mode programs are passing in an ext4fs superblock, not
ac27a0ec
DK		 689 * a kernel struct super_block. This will allow us to call the feature-test
690 * macros from user land. */
617ba13b 691#define EXT4_SB(sb) (sb)
ac27a0ec
DK		 692#endif
693
617ba13b 694#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
ac27a0ec
DK		 695
696/*
697 * Codes for operating systems
698 */
617ba13b
MC		 699#define EXT4_OS_LINUX 0
700#define EXT4_OS_HURD 1
701#define EXT4_OS_MASIX 2
702#define EXT4_OS_FREEBSD 3
703#define EXT4_OS_LITES 4
ac27a0ec
DK		 704
705/*
706 * Revision levels
707 */
617ba13b
MC		 708#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
709#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
ac27a0ec 710
617ba13b
MC		 711#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
712#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
ac27a0ec 713
617ba13b 714#define EXT4_GOOD_OLD_INODE_SIZE 128
ac27a0ec
DK		 715
716/*
717 * Feature set definitions
718 */
719
617ba13b 720#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
3a06d778 721 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
617ba13b 722#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
3a06d778 723 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
617ba13b 724#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
3a06d778 725 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
617ba13b
MC		 726#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
727 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
728#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
729 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
730#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
731 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
732#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
733 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
734#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
735 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
736#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
737 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
738
739#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
740#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
741#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
742#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
743#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
744#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
745
746#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
747#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
748#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
0fc1b451 749#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
717d50e4 750#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
f8628a14 751#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
ef7f3835 752#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
617ba13b
MC		 753
754#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
755#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
756#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
757#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
758#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
a86c6181 759#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
bd81d8ee 760#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
0fc1b451 761#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
ce421581 762#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
617ba13b
MC		 763
764#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
765#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
766 EXT4_FEATURE_INCOMPAT_RECOVER| \
a86c6181 767 EXT4_FEATURE_INCOMPAT_META_BG| \
bd81d8ee 768 EXT4_FEATURE_INCOMPAT_EXTENTS| \
ce421581
JS		 769 EXT4_FEATURE_INCOMPAT_64BIT| \
770 EXT4_FEATURE_INCOMPAT_FLEX_BG)
617ba13b
MC		 771#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
772 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
717d50e4 773 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
f8628a14 774 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
ef7f3835 775 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
0fc1b451
AK		 776 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
777 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
ac27a0ec
DK		 778
779/*
780 * Default values for user and/or group using reserved blocks
781 */
617ba13b
MC		 782#define EXT4_DEF_RESUID 0
783#define EXT4_DEF_RESGID 0
ac27a0ec 784
240799cd
TT		 785#define EXT4_DEF_INODE_READAHEAD_BLKS 32
786
ac27a0ec
DK		 787/*
788 * Default mount options
789 */
617ba13b
MC		 790#define EXT4_DEFM_DEBUG 0x0001
791#define EXT4_DEFM_BSDGROUPS 0x0002
792#define EXT4_DEFM_XATTR_USER 0x0004
793#define EXT4_DEFM_ACL 0x0008
794#define EXT4_DEFM_UID16 0x0010
795#define EXT4_DEFM_JMODE 0x0060
796#define EXT4_DEFM_JMODE_DATA 0x0020
797#define EXT4_DEFM_JMODE_ORDERED 0x0040
798#define EXT4_DEFM_JMODE_WBACK 0x0060
ac27a0ec 799
30773840
TT		 800/*
801 * Default journal batch times
802 */
803#define EXT4_DEF_MIN_BATCH_TIME 0
804#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
805
ac27a0ec
DK		 806/*
807 * Structure of a directory entry
808 */
617ba13b 809#define EXT4_NAME_LEN 255
ac27a0ec 810
617ba13b 811struct ext4_dir_entry {
ac27a0ec
DK		 812 __le32 inode; /* Inode number */
813 __le16 rec_len; /* Directory entry length */
814 __le16 name_len; /* Name length */
617ba13b 815 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 816};
817
818/*
617ba13b 819 * The new version of the directory entry. Since EXT4 structures are
ac27a0ec
DK		 820 * stored in intel byte order, and the name_len field could never be
821 * bigger than 255 chars, it's safe to reclaim the extra byte for the
822 * file_type field.
823 */
617ba13b 824struct ext4_dir_entry_2 {
ac27a0ec
DK		 825 __le32 inode; /* Inode number */
826 __le16 rec_len; /* Directory entry length */
827 __u8 name_len; /* Name length */
828 __u8 file_type;
617ba13b 829 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 830};
831
832/*
617ba13b 833 * Ext4 directory file types. Only the low 3 bits are used. The
ac27a0ec
DK		 834 * other bits are reserved for now.
835 */
617ba13b
MC		 836#define EXT4_FT_UNKNOWN 0
837#define EXT4_FT_REG_FILE 1
838#define EXT4_FT_DIR 2
839#define EXT4_FT_CHRDEV 3
840#define EXT4_FT_BLKDEV 4
841#define EXT4_FT_FIFO 5
842#define EXT4_FT_SOCK 6
843#define EXT4_FT_SYMLINK 7
ac27a0ec 844
617ba13b 845#define EXT4_FT_MAX 8
ac27a0ec
DK		 846
847/*
617ba13b 848 * EXT4_DIR_PAD defines the directory entries boundaries
ac27a0ec
DK		 849 *
850 * NOTE: It must be a multiple of 4
851 */
617ba13b
MC		 852#define EXT4_DIR_PAD 4
853#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
854#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
855 ~EXT4_DIR_ROUND)
a72d7f83
JK		 856#define EXT4_MAX_REC_LEN ((1<<16)-1)
857
ac27a0ec
DK		 858/*
859 * Hash Tree Directory indexing
860 * (c) Daniel Phillips, 2001
861 */
862
4074fe37
ES		 863#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
864 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
617ba13b
MC		 865 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
866#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
867#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
ac27a0ec
DK		 868
869/* Legal values for the dx_root hash_version field: */
870
871#define DX_HASH_LEGACY 0
872#define DX_HASH_HALF_MD4 1
873#define DX_HASH_TEA 2
f99b2589
TT		 874#define DX_HASH_LEGACY_UNSIGNED 3
875#define DX_HASH_HALF_MD4_UNSIGNED 4
876#define DX_HASH_TEA_UNSIGNED 5
ac27a0ec
DK		 877
878#ifdef __KERNEL__
879
880/* hash info structure used by the directory hash */
881struct dx_hash_info
882{
883 u32 hash;
884 u32 minor_hash;
885 int hash_version;
886 u32 *seed;
887};
888
617ba13b 889#define EXT4_HTREE_EOF 0x7fffffff
ac27a0ec
DK		 890
891/*
617ba13b 892 * Control parameters used by ext4_htree_next_block
ac27a0ec
DK		 893 */
894#define HASH_NB_ALWAYS 1
895
896
897/*
898 * Describe an inode's exact location on disk and in memory
899 */
617ba13b 900struct ext4_iloc
ac27a0ec
DK		 901{
902 struct buffer_head *bh;
903 unsigned long offset;
fd2d4291 904 ext4_group_t block_group;
ac27a0ec
DK		 905};
906
617ba13b 907static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
ac27a0ec 908{
617ba13b 909 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
ac27a0ec
DK		 910}
911
912/*
913 * This structure is stuffed into the struct file's private_data field
914 * for directories. It is where we put information so that we can do
915 * readdir operations in hash tree order.
916 */
917struct dir_private_info {
918 struct rb_root root;
919 struct rb_node *curr_node;
920 struct fname *extra_fname;
921 loff_t last_pos;
922 __u32 curr_hash;
923 __u32 curr_minor_hash;
924 __u32 next_hash;
925};
926
927/* calculate the first block number of the group */
617ba13b 928static inline ext4_fsblk_t
fd2d4291 929ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
ac27a0ec 930{
617ba13b
MC		 931 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
932 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
ac27a0ec
DK		 933}
934
935/*
936 * Special error return code only used by dx_probe() and its callers.
937 */
938#define ERR_BAD_DX_DIR -75000
939
72b64b59 940void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
a9df9a49 941 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
3a5b2ecd 942
9f6200bb
TT		 943extern struct proc_dir_entry *ext4_proc_root;
944
5e8814f2
TT		 945#ifdef CONFIG_PROC_FS
946extern const struct file_operations ext4_ui_proc_fops;
947
948#define EXT4_PROC_HANDLER(name, var) \
949do { \
950 proc = proc_create_data(name, mode, sbi->s_proc, \
951 &ext4_ui_proc_fops, &sbi->s_##var); \
952 if (proc == NULL) { \
953 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
954 goto err_out; \
955 } \
956} while (0)
957#else
958#define EXT4_PROC_HANDLER(name, var)
959#endif
960
ac27a0ec
DK		 961/*
962 * Function prototypes
963 */
964
965/*
966 * Ok, these declarations are also in <linux/kernel.h> but none of the
617ba13b 967 * ext4 source programs needs to include it so they are duplicated here.
ac27a0ec 968 */
8c55e204
DK		 969# define NORET_TYPE /**/
970# define ATTRIB_NORET __attribute__((noreturn))
971# define NORET_AND noreturn,
ac27a0ec 972
498e5f24
TT		 973/* bitmap.c */
974extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
975
ac27a0ec 976/* balloc.c */
3a5b2ecd
MC		 977extern unsigned int ext4_block_group(struct super_block *sb,
978 ext4_fsblk_t blocknr);
979extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
980 ext4_fsblk_t blocknr);
fd2d4291
AM		 981extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
982extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
983 ext4_group_t group);
7061eba7 984extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
617ba13b 985 ext4_fsblk_t goal, unsigned long *count, int *errp);
5c791616 986extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
8c3bf8a0 987extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
af5bc92d 988extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
c9de560d 989 ext4_fsblk_t block, unsigned long count, int metadata);
e21675d4
AK		 990extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
991 ext4_fsblk_t block, unsigned long count);
af5bc92d
TT		 992extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
993extern void ext4_check_blocks_bitmap(struct super_block *);
617ba13b 994extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
fd2d4291 995 ext4_group_t block_group,
ac27a0ec 996 struct buffer_head ** bh);
617ba13b 997extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
ac27a0ec
DK		 998
999/* dir.c */
617ba13b
MC		 1000extern int ext4_check_dir_entry(const char *, struct inode *,
1001 struct ext4_dir_entry_2 *,
498e5f24 1002 struct buffer_head *, unsigned int);
617ba13b 1003extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
ac27a0ec 1004 __u32 minor_hash,
617ba13b
MC		 1005 struct ext4_dir_entry_2 *dirent);
1006extern void ext4_htree_free_dir_info(struct dir_private_info *p);
ac27a0ec
DK		 1007
1008/* fsync.c */
af5bc92d 1009extern int ext4_sync_file(struct file *, struct dentry *, int);
ac27a0ec
DK		 1010
1011/* hash.c */
617ba13b 1012extern int ext4fs_dirhash(const char *name, int len, struct
ac27a0ec
DK		 1013 dx_hash_info *hinfo);
1014
1015/* ialloc.c */
af5bc92d
TT		 1016extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1017extern void ext4_free_inode(handle_t *, struct inode *);
1018extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1019extern unsigned long ext4_count_free_inodes(struct super_block *);
1020extern unsigned long ext4_count_dirs(struct super_block *);
1021extern void ext4_check_inodes_bitmap(struct super_block *);
ac27a0ec 1022
c9de560d
AT		 1023/* mballoc.c */
1024extern long ext4_mb_stats;
1025extern long ext4_mb_max_to_scan;
1026extern int ext4_mb_init(struct super_block *, int);
1027extern int ext4_mb_release(struct super_block *);
1028extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1029 struct ext4_allocation_request *, int *);
1030extern int ext4_mb_reserve_blocks(struct super_block *, int);
c2ea3fde 1031extern void ext4_discard_preallocations(struct inode *);
c9de560d
AT		 1032extern int __init init_ext4_mballoc(void);
1033extern void exit_ext4_mballoc(void);
1034extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1035 unsigned long, unsigned long, int, unsigned long *);
920313a7 1036extern int ext4_mb_add_groupinfo(struct super_block *sb,
5f21b0e6
FB		 1037 ext4_group_t i, struct ext4_group_desc *desc);
1038extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1039 ext4_grpblk_t add);
920313a7
AK		 1040extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1041extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1042 ext4_group_t, int);
ac27a0ec 1043/* inode.c */
617ba13b
MC		 1044int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1045 struct buffer_head *bh, ext4_fsblk_t blocknr);
725d26d3
AK		 1046struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1047 ext4_lblk_t, int, int *);
1048struct buffer_head *ext4_bread(handle_t *, struct inode *,
1049 ext4_lblk_t, int, int *);
6873fa0d
ES		 1050int ext4_get_block(struct inode *inode, sector_t iblock,
1051 struct buffer_head *bh_result, int create);
ac27a0ec 1052
1d1fe1ee 1053extern struct inode *ext4_iget(struct super_block *, unsigned long);
af5bc92d
TT		 1054extern int ext4_write_inode(struct inode *, int);
1055extern int ext4_setattr(struct dentry *, struct iattr *);
3e3398a0
MC		 1056extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1057 struct kstat *stat);
af5bc92d
TT		 1058extern void ext4_delete_inode(struct inode *);
1059extern int ext4_sync_inode(handle_t *, struct inode *);
617ba13b
MC		 1060extern void ext4_dirty_inode(struct inode *);
1061extern int ext4_change_inode_journal_flag(struct inode *, int);
1062extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
91ef4caf 1063extern int ext4_can_truncate(struct inode *inode);
af5bc92d 1064extern void ext4_truncate(struct inode *);
617ba13b 1065extern void ext4_set_inode_flags(struct inode *);
ff9ddf7e 1066extern void ext4_get_inode_flags(struct ext4_inode_info *);
617ba13b 1067extern void ext4_set_aops(struct inode *inode);
a86c6181 1068extern int ext4_writepage_trans_blocks(struct inode *);
a02908f1 1069extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
f3bd1f3f 1070extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
cf108bca 1071extern int ext4_block_truncate_page(handle_t *handle,
a86c6181 1072 struct address_space *mapping, loff_t from);
2e9ee850 1073extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
60e58e0f 1074extern qsize_t ext4_get_reserved_space(struct inode *inode);
ac27a0ec
DK		 1075
1076/* ioctl.c */
5cdd7b2d 1077extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
af5bc92d 1078extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
ac27a0ec 1079
c14c6fd5 1080/* migrate.c */
2a43a878 1081extern int ext4_ext_migrate(struct inode *);
3d0518f4 1082
ac27a0ec 1083/* namei.c */
3d0518f4
WY		 1084extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1085extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
617ba13b
MC		 1086extern int ext4_orphan_add(handle_t *, struct inode *);
1087extern int ext4_orphan_del(handle_t *, struct inode *);
1088extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
ac27a0ec
DK		 1089 __u32 start_minor_hash, __u32 *next_hash);
1090
1091/* resize.c */
617ba13b
MC		 1092extern int ext4_group_add(struct super_block *sb,
1093 struct ext4_new_group_data *input);
1094extern int ext4_group_extend(struct super_block *sb,
1095 struct ext4_super_block *es,
1096 ext4_fsblk_t n_blocks_count);
ac27a0ec
DK		 1097
1098/* super.c */
af5bc92d 1099extern void ext4_error(struct super_block *, const char *, const char *, ...)
ac27a0ec 1100 __attribute__ ((format (printf, 3, 4)));
af5bc92d
TT		 1101extern void __ext4_std_error(struct super_block *, const char *, int);
1102extern void ext4_abort(struct super_block *, const char *, const char *, ...)
ac27a0ec 1103 __attribute__ ((format (printf, 3, 4)));
af5bc92d 1104extern void ext4_warning(struct super_block *, const char *, const char *, ...)
ac27a0ec 1105 __attribute__ ((format (printf, 3, 4)));
5d1b1b3f
AK		 1106extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1107 const char *, const char *, ...)
1108 __attribute__ ((format (printf, 4, 5)));
af5bc92d 1109extern void ext4_update_dynamic_rev(struct super_block *sb);
99e6f829
AK		 1110extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1111 __u32 compat);
1112extern int ext4_update_rocompat_feature(handle_t *handle,
1113 struct super_block *sb, __u32 rocompat);
1114extern int ext4_update_incompat_feature(handle_t *handle,
1115 struct super_block *sb, __u32 incompat);
8fadc143
AR		 1116extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1117 struct ext4_group_desc *bg);
1118extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1119 struct ext4_group_desc *bg);
1120extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1121 struct ext4_group_desc *bg);
560671a0
AK		 1122extern __u32 ext4_free_blks_count(struct super_block *sb,
1123 struct ext4_group_desc *bg);
1124extern __u32 ext4_free_inodes_count(struct super_block *sb,
1125 struct ext4_group_desc *bg);
1126extern __u32 ext4_used_dirs_count(struct super_block *sb,
1127 struct ext4_group_desc *bg);
1128extern __u32 ext4_itable_unused_count(struct super_block *sb,
1129 struct ext4_group_desc *bg);
8fadc143
AR		 1130extern void ext4_block_bitmap_set(struct super_block *sb,
1131 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1132extern void ext4_inode_bitmap_set(struct super_block *sb,
1133 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1134extern void ext4_inode_table_set(struct super_block *sb,
1135 struct ext4_group_desc *bg, ext4_fsblk_t blk);
560671a0
AK		 1136extern void ext4_free_blks_set(struct super_block *sb,
1137 struct ext4_group_desc *bg, __u32 count);
1138extern void ext4_free_inodes_set(struct super_block *sb,
1139 struct ext4_group_desc *bg, __u32 count);
1140extern void ext4_used_dirs_set(struct super_block *sb,
1141 struct ext4_group_desc *bg, __u32 count);
1142extern void ext4_itable_unused_set(struct super_block *sb,
1143 struct ext4_group_desc *bg, __u32 count);
bd81d8ee
LV		 1144
1145static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1146{
1147 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
6bc9feff 1148 le32_to_cpu(es->s_blocks_count_lo);
bd81d8ee
LV		 1149}
1150
1151static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1152{
1153 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
308ba3ec 1154 le32_to_cpu(es->s_r_blocks_count_lo);
bd81d8ee
LV		 1155}
1156
1157static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1158{
1159 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
308ba3ec 1160 le32_to_cpu(es->s_free_blocks_count_lo);
bd81d8ee
LV		 1161}
1162
1163static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1164 ext4_fsblk_t blk)
1165{
6bc9feff 1166 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1167 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1168}
1169
1170static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1171 ext4_fsblk_t blk)
1172{
308ba3ec 1173 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1174 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1175}
1176
1177static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1178 ext4_fsblk_t blk)
1179{
308ba3ec 1180 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1181 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1182}
1183
a48380f7
AK		 1184static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1185{
06a279d6
TT		 1186 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1187 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1188 le32_to_cpu(raw_inode->i_size_lo);
1189 else
1190 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
a48380f7 1191}
bd81d8ee 1192
a48380f7
AK		 1193static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1194{
1195 raw_inode->i_size_lo = cpu_to_le32(i_size);
1196 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1197}
ac27a0ec 1198
c9de560d
AT		 1199static inline
1200struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
af5bc92d 1201 ext4_group_t group)
c9de560d
AT		 1202{
1203 struct ext4_group_info ***grp_info;
1204 long indexv, indexh;
1205 grp_info = EXT4_SB(sb)->s_group_info;
1206 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1207 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1208 return grp_info[indexv][indexh];
1209}
1210
1211
772cb7c8
JS		 1212static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1213 ext4_group_t block_group)
1214{
1215 return block_group >> sbi->s_log_groups_per_flex;
1216}
1217
1218static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1219{
1220 return 1 << sbi->s_log_groups_per_flex;
1221}
1222
617ba13b 1223#define ext4_std_error(sb, errno) \
ac27a0ec
DK		 1224do { \
1225 if ((errno)) \
4db9c54a 1226 __ext4_std_error((sb), __func__, (errno)); \
ac27a0ec
DK		 1227} while (0)
1228
a30d542a 1229#ifdef CONFIG_SMP
179f7ebf 1230/* Each CPU can accumulate percpu_counter_batch blocks in their local
a30d542a 1231 * counters. So we need to make sure we have free blocks more
179f7ebf 1232 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
a30d542a 1233 */
179f7ebf 1234#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
a30d542a
AK		 1235#else
1236#define EXT4_FREEBLOCKS_WATERMARK 0
1237#endif
1238
cf17fea6
AK		 1239static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1240{
1241 /*
1242 * XXX: replace with spinlock if seen contended -bzzz
1243 */
1244 down_write(&EXT4_I(inode)->i_data_sem);
1245 if (newsize > EXT4_I(inode)->i_disksize)
1246 EXT4_I(inode)->i_disksize = newsize;
1247 up_write(&EXT4_I(inode)->i_data_sem);
1248 return ;
1249}
a30d542a 1250
5d1b1b3f
AK		 1251struct ext4_group_info {
1252 unsigned long bb_state;
1253 struct rb_root bb_free_root;
1254 unsigned short bb_first_free;
1255 unsigned short bb_free;
1256 unsigned short bb_fragments;
1257 struct list_head bb_prealloc_list;
1258#ifdef DOUBLE_CHECK
1259 void *bb_bitmap;
1260#endif
1261 struct rw_semaphore alloc_sem;
1262 unsigned short bb_counters[];
1263};
1264
1265#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1266#define EXT4_GROUP_INFO_LOCKED_BIT 1
1267
1268#define EXT4_MB_GRP_NEED_INIT(grp) \
1269 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1270
1271static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1272{
1273 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1274
1275 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1276}
1277
1278static inline void ext4_unlock_group(struct super_block *sb,
1279 ext4_group_t group)
1280{
1281 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1282
1283 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1284}
1285
1286static inline int ext4_is_group_locked(struct super_block *sb,
1287 ext4_group_t group)
1288{
1289 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1290
1291 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1292 &(grinfo->bb_state));
1293}
1294
ac27a0ec
DK		 1295/*
1296 * Inodes and files operations
1297 */
1298
1299/* dir.c */
617ba13b 1300extern const struct file_operations ext4_dir_operations;
ac27a0ec
DK		 1301
1302/* file.c */
c5ef1c42 1303extern const struct inode_operations ext4_file_inode_operations;
617ba13b 1304extern const struct file_operations ext4_file_operations;
ac27a0ec
DK		 1305
1306/* namei.c */
c5ef1c42
AV		 1307extern const struct inode_operations ext4_dir_inode_operations;
1308extern const struct inode_operations ext4_special_inode_operations;
ac27a0ec
DK		 1309
1310/* symlink.c */
c5ef1c42
AV		 1311extern const struct inode_operations ext4_symlink_inode_operations;
1312extern const struct inode_operations ext4_fast_symlink_inode_operations;
ac27a0ec 1313
a86c6181
AT		 1314/* extents.c */
1315extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1316extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
a02908f1
MC		 1317extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1318 int chunk);
a86c6181 1319extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
498e5f24
TT		 1320 ext4_lblk_t iblock, unsigned int max_blocks,
1321 struct buffer_head *bh_result,
1322 int create, int extend_disksize);
cf108bca 1323extern void ext4_ext_truncate(struct inode *);
a86c6181
AT		 1324extern void ext4_ext_init(struct super_block *);
1325extern void ext4_ext_release(struct super_block *);
a2df2a63
AA		 1326extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1327 loff_t len);
0e855ac8 1328extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
498e5f24 1329 sector_t block, unsigned int max_blocks,
0e855ac8 1330 struct buffer_head *bh, int create,
d2a17637 1331 int extend_disksize, int flag);
3a06d778
AK		 1332extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1333 __u64 start, __u64 len);
1334
2ccb5fb9
AK		 1335/*
1336 * Add new method to test wether block and inode bitmaps are properly
1337 * initialized. With uninit_bg reading the block from disk is not enough
1338 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1339 */
1340#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1341
1342static inline int bitmap_uptodate(struct buffer_head *bh)
1343{
1344 return (buffer_uptodate(bh) &&
1345 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1346}
1347static inline void set_bitmap_uptodate(struct buffer_head *bh)
1348{
1349 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1350}
1351
ac27a0ec
DK		 1352#endif /* __KERNEL__ */
1353
3dcf5451 1354#endif /* _EXT4_H */
Linux 6.x block layer and io_uring tree(s)