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ext4: Add ext4_find_next_bit()
[linux-2.6-block.git] / include / linux / ext4_fs.h
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/include/linux/ext4_fs.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
617ba13b
MC		 16#ifndef _LINUX_EXT4_FS_H
17#define _LINUX_EXT4_FS_H
ac27a0ec
DK		 18
19#include <linux/types.h>
3a5b2ecd 20#include <linux/blkdev.h>
ac27a0ec
DK		 21#include <linux/magic.h>
22
23/*
24 * The second extended filesystem constants/structures
25 */
26
27/*
617ba13b 28 * Define EXT4FS_DEBUG to produce debug messages
ac27a0ec 29 */
617ba13b 30#undef EXT4FS_DEBUG
ac27a0ec
DK		 31
32/*
617ba13b 33 * Define EXT4_RESERVATION to reserve data blocks for expanding files
ac27a0ec 34 */
8c55e204 35#define EXT4_DEFAULT_RESERVE_BLOCKS 8
ac27a0ec 36/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
8c55e204 37#define EXT4_MAX_RESERVE_BLOCKS 1027
617ba13b 38#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
ac27a0ec
DK		 39
40/*
41 * Debug code
42 */
617ba13b
MC		 43#ifdef EXT4FS_DEBUG
44#define ext4_debug(f, a...) \
ac27a0ec 45 do { \
617ba13b 46 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
ac27a0ec
DK		 47 __FILE__, __LINE__, __FUNCTION__); \
48 printk (KERN_DEBUG f, ## a); \
49 } while (0)
50#else
617ba13b 51#define ext4_debug(f, a...) do {} while (0)
ac27a0ec
DK		 52#endif
53
54/*
55 * Special inodes numbers
56 */
617ba13b
MC		 57#define EXT4_BAD_INO 1 /* Bad blocks inode */
58#define EXT4_ROOT_INO 2 /* Root inode */
59#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
60#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
61#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
62#define EXT4_JOURNAL_INO 8 /* Journal inode */
ac27a0ec 63
617ba13b
MC		 64/* First non-reserved inode for old ext4 filesystems */
65#define EXT4_GOOD_OLD_FIRST_INO 11
ac27a0ec
DK		 66
67/*
68 * Maximal count of links to a file
69 */
f8628a14 70#define EXT4_LINK_MAX 65000
ac27a0ec
DK		 71
72/*
73 * Macro-instructions used to manage several block sizes
74 */
617ba13b 75#define EXT4_MIN_BLOCK_SIZE 1024
afc7cbca
TS		 76#define EXT4_MAX_BLOCK_SIZE 65536
77#define EXT4_MIN_BLOCK_LOG_SIZE 10
ac27a0ec 78#ifdef __KERNEL__
617ba13b 79# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
ac27a0ec 80#else
617ba13b 81# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
ac27a0ec 82#endif
617ba13b 83#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
ac27a0ec 84#ifdef __KERNEL__
617ba13b 85# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
ac27a0ec 86#else
617ba13b 87# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
ac27a0ec
DK		 88#endif
89#ifdef __KERNEL__
617ba13b
MC		 90#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
91#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
92#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
ac27a0ec 93#else
617ba13b
MC		 94#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
95 EXT4_GOOD_OLD_INODE_SIZE : \
ac27a0ec 96 (s)->s_inode_size)
617ba13b
MC		 97#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
98 EXT4_GOOD_OLD_FIRST_INO : \
ac27a0ec
DK		 99 (s)->s_first_ino)
100#endif
a2df2a63 101#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
ac27a0ec 102
ac27a0ec
DK		 103/*
104 * Structure of a blocks group descriptor
105 */
617ba13b 106struct ext4_group_desc
ac27a0ec 107{
3a14589c 108 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
5272f837
AK		 109 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
110 __le32 bg_inode_table_lo; /* Inodes table block */
ac27a0ec
DK		 111 __le16 bg_free_blocks_count; /* Free blocks count */
112 __le16 bg_free_inodes_count; /* Free inodes count */
113 __le16 bg_used_dirs_count; /* Directories count */
717d50e4
AD		 114 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
115 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
116 __le16 bg_itable_unused; /* Unused inodes count */
117 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
8fadc143
AR		 118 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
119 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
120 __le32 bg_inode_table_hi; /* Inodes table block MSB */
91b51a01
CL		 121 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
122 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
123 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
124 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
125 __u32 bg_reserved2[3];
ac27a0ec
DK		 126};
127
717d50e4
AD		 128#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
129#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
130#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
131
bd81d8ee
LV		 132#ifdef __KERNEL__
133#include <linux/ext4_fs_i.h>
134#include <linux/ext4_fs_sb.h>
135#endif
ac27a0ec
DK		 136/*
137 * Macro-instructions used to manage group descriptors
138 */
0d1ee42f 139#define EXT4_MIN_DESC_SIZE 32
8fadc143 140#define EXT4_MIN_DESC_SIZE_64BIT 64
0d1ee42f
AR		 141#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
142#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
ac27a0ec 143#ifdef __KERNEL__
617ba13b
MC		 144# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
145# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
146# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
147# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
ac27a0ec 148#else
617ba13b 149# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
0d1ee42f 150# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
617ba13b 151# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
ac27a0ec
DK		 152#endif
153
154/*
155 * Constants relative to the data blocks
156 */
617ba13b
MC		 157#define EXT4_NDIR_BLOCKS 12
158#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
159#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
160#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
161#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
ac27a0ec
DK		 162
163/*
164 * Inode flags
165 */
617ba13b
MC		 166#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
167#define EXT4_UNRM_FL 0x00000002 /* Undelete */
168#define EXT4_COMPR_FL 0x00000004 /* Compress file */
169#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
170#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
171#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
172#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
173#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
ac27a0ec 174/* Reserved for compression usage... */
617ba13b
MC		 175#define EXT4_DIRTY_FL 0x00000100
176#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
177#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
178#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
ac27a0ec 179/* End compression flags --- maybe not all used */
617ba13b
MC		 180#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
181#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
182#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
183#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
184#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
185#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
8180a562 186#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
a86c6181 187#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
8180a562 188#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
ac27a0ec 189
a86c6181 190#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
617ba13b 191#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
ac27a0ec
DK		 192
193/*
194 * Inode dynamic state flags
195 */
617ba13b
MC		 196#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
197#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
198#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
6dd4ee7c 199#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
ac27a0ec
DK		 200
201/* Used to pass group descriptor data when online resize is done */
617ba13b 202struct ext4_new_group_input {
8c55e204
DK		 203 __u32 group; /* Group number for this data */
204 __u64 block_bitmap; /* Absolute block number of block bitmap */
205 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
206 __u64 inode_table; /* Absolute block number of inode table start */
207 __u32 blocks_count; /* Total number of blocks in this group */
208 __u16 reserved_blocks; /* Number of reserved blocks in this group */
ac27a0ec
DK		 209 __u16 unused;
210};
211
617ba13b
MC		 212/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
213struct ext4_new_group_data {
ac27a0ec 214 __u32 group;
bd81d8ee
LV		 215 __u64 block_bitmap;
216 __u64 inode_bitmap;
217 __u64 inode_table;
ac27a0ec
DK		 218 __u32 blocks_count;
219 __u16 reserved_blocks;
220 __u16 unused;
221 __u32 free_blocks_count;
222};
223
a2df2a63
AA		 224/*
225 * Following is used by preallocation code to tell get_blocks() that we
226 * want uninitialzed extents.
227 */
228#define EXT4_CREATE_UNINITIALIZED_EXT 2
ac27a0ec
DK		 229
230/*
231 * ioctl commands
232 */
617ba13b
MC		 233#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
234#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
235#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
236#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
237#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
238#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
239#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
240#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
e23291b9 241#ifdef CONFIG_JBD2_DEBUG
617ba13b 242#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
ac27a0ec 243#endif
617ba13b
MC		 244#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
245#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
c14c6fd5 246#define EXT4_IOC_MIGRATE _IO('f', 7)
ac27a0ec
DK		 247
248/*
249 * ioctl commands in 32 bit emulation
250 */
617ba13b
MC		 251#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
252#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
253#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
254#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
255#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
256#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
257#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
e23291b9 258#ifdef CONFIG_JBD2_DEBUG
617ba13b 259#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
ac27a0ec 260#endif
617ba13b
MC		 261#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
262#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
ac27a0ec
DK		 263
264
265/*
266 * Mount options
267 */
617ba13b 268struct ext4_mount_options {
ac27a0ec
DK		 269 unsigned long s_mount_opt;
270 uid_t s_resuid;
271 gid_t s_resgid;
272 unsigned long s_commit_interval;
273#ifdef CONFIG_QUOTA
274 int s_jquota_fmt;
275 char *s_qf_names[MAXQUOTAS];
276#endif
277};
278
279/*
280 * Structure of an inode on the disk
281 */
617ba13b 282struct ext4_inode {
ac27a0ec
DK		 283 __le16 i_mode; /* File mode */
284 __le16 i_uid; /* Low 16 bits of Owner Uid */
a48380f7 285 __le32 i_size_lo; /* Size in bytes */
ac27a0ec 286 __le32 i_atime; /* Access time */
ef7f3835 287 __le32 i_ctime; /* Inode Change time */
ac27a0ec
DK		 288 __le32 i_mtime; /* Modification time */
289 __le32 i_dtime; /* Deletion Time */
290 __le16 i_gid; /* Low 16 bits of Group Id */
291 __le16 i_links_count; /* Links count */
0fc1b451 292 __le32 i_blocks_lo; /* Blocks count */
ac27a0ec
DK		 293 __le32 i_flags; /* File flags */
294 union {
295 struct {
25ec56b5 296 __le32 l_i_version;
ac27a0ec
DK		 297 } linux1;
298 struct {
299 __u32 h_i_translator;
300 } hurd1;
301 struct {
302 __u32 m_i_reserved1;
303 } masix1;
304 } osd1; /* OS dependent 1 */
617ba13b 305 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
ac27a0ec 306 __le32 i_generation; /* File version (for NFS) */
7973c0c1 307 __le32 i_file_acl_lo; /* File ACL */
a48380f7 308 __le32 i_size_high;
f077d0d7 309 __le32 i_obso_faddr; /* Obsoleted fragment address */
ac27a0ec
DK		 310 union {
311 struct {
0fc1b451 312 __le16 l_i_blocks_high; /* were l_i_reserved1 */
a1ddeb7e 313 __le16 l_i_file_acl_high;
8c55e204 314 __le16 l_i_uid_high; /* these 2 fields */
ac27a0ec
DK		 315 __le16 l_i_gid_high; /* were reserved2[0] */
316 __u32 l_i_reserved2;
317 } linux2;
318 struct {
f077d0d7 319 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
ac27a0ec
DK		 320 __u16 h_i_mode_high;
321 __u16 h_i_uid_high;
322 __u16 h_i_gid_high;
323 __u32 h_i_author;
324 } hurd2;
325 struct {
f077d0d7 326 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
a1ddeb7e 327 __le16 m_i_file_acl_high;
ac27a0ec
DK		 328 __u32 m_i_reserved2[2];
329 } masix2;
330 } osd2; /* OS dependent 2 */
331 __le16 i_extra_isize;
332 __le16 i_pad1;
ef7f3835
KS		 333 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
334 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
335 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
336 __le32 i_crtime; /* File Creation time */
337 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
25ec56b5 338 __le32 i_version_hi; /* high 32 bits for 64-bit version */
ac27a0ec
DK		 339};
340
ac27a0ec 341
ef7f3835
KS		 342#define EXT4_EPOCH_BITS 2
343#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
344#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
345
346/*
347 * Extended fields will fit into an inode if the filesystem was formatted
348 * with large inodes (-I 256 or larger) and there are not currently any EAs
349 * consuming all of the available space. For new inodes we always reserve
350 * enough space for the kernel's known extended fields, but for inodes
351 * created with an old kernel this might not have been the case. None of
352 * the extended inode fields is critical for correct filesystem operation.
353 * This macro checks if a certain field fits in the inode. Note that
354 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
355 */
356#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
357 ((offsetof(typeof(*ext4_inode), field) + \
358 sizeof((ext4_inode)->field)) \
359 <= (EXT4_GOOD_OLD_INODE_SIZE + \
360 (einode)->i_extra_isize)) \
361
362static inline __le32 ext4_encode_extra_time(struct timespec *time)
363{
364 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
365 time->tv_sec >> 32 : 0) |
366 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
367}
368
369static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
370{
371 if (sizeof(time->tv_sec) > 4)
372 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
373 << 32;
374 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
375}
376
377#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
378do { \
379 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
380 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
381 (raw_inode)->xtime ## _extra = \
382 ext4_encode_extra_time(&(inode)->xtime); \
383} while (0)
384
385#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
386do { \
387 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
388 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
389 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
390 (raw_inode)->xtime ## _extra = \
391 ext4_encode_extra_time(&(einode)->xtime); \
392} while (0)
393
394#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
395do { \
396 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
397 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
398 ext4_decode_extra_time(&(inode)->xtime, \
399 raw_inode->xtime ## _extra); \
400} while (0)
401
402#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
403do { \
404 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
405 (einode)->xtime.tv_sec = \
406 (signed)le32_to_cpu((raw_inode)->xtime); \
407 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
408 ext4_decode_extra_time(&(einode)->xtime, \
409 raw_inode->xtime ## _extra); \
410} while (0)
411
25ec56b5
JNC		 412#define i_disk_version osd1.linux1.l_i_version
413
ac27a0ec
DK		 414#if defined(__KERNEL__) || defined(__linux__)
415#define i_reserved1 osd1.linux1.l_i_reserved1
a1ddeb7e 416#define i_file_acl_high osd2.linux2.l_i_file_acl_high
0fc1b451 417#define i_blocks_high osd2.linux2.l_i_blocks_high
ac27a0ec
DK		 418#define i_uid_low i_uid
419#define i_gid_low i_gid
420#define i_uid_high osd2.linux2.l_i_uid_high
421#define i_gid_high osd2.linux2.l_i_gid_high
422#define i_reserved2 osd2.linux2.l_i_reserved2
423
424#elif defined(__GNU__)
425
426#define i_translator osd1.hurd1.h_i_translator
ac27a0ec
DK		 427#define i_uid_high osd2.hurd2.h_i_uid_high
428#define i_gid_high osd2.hurd2.h_i_gid_high
429#define i_author osd2.hurd2.h_i_author
430
431#elif defined(__masix__)
432
433#define i_reserved1 osd1.masix1.m_i_reserved1
a1ddeb7e 434#define i_file_acl_high osd2.masix2.m_i_file_acl_high
ac27a0ec
DK		 435#define i_reserved2 osd2.masix2.m_i_reserved2
436
437#endif /* defined(__KERNEL__) || defined(__linux__) */
438
439/*
440 * File system states
441 */
617ba13b
MC		 442#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
443#define EXT4_ERROR_FS 0x0002 /* Errors detected */
444#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
ac27a0ec
DK		 445
446/*
447 * Mount flags
448 */
617ba13b
MC		 449#define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
450#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
451#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
452#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
453#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
454#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
455#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
456#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
457#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
458#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
459#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
460#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
461#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
462#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
463#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
464#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
465#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
466#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
467#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
468#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
469#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
470#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
471#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
472#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
a86c6181 473#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
818d276c
GS		 474#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
475#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
25ec56b5 476#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
617ba13b 477/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
ac27a0ec 478#ifndef _LINUX_EXT2_FS_H
617ba13b
MC		 479#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
480#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
481#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
482 EXT4_MOUNT_##opt)
ac27a0ec 483#else
617ba13b
MC		 484#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
485#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
486#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
ac27a0ec
DK		 487#endif
488
617ba13b
MC		 489#define ext4_set_bit ext2_set_bit
490#define ext4_set_bit_atomic ext2_set_bit_atomic
491#define ext4_clear_bit ext2_clear_bit
492#define ext4_clear_bit_atomic ext2_clear_bit_atomic
493#define ext4_test_bit ext2_test_bit
494#define ext4_find_first_zero_bit ext2_find_first_zero_bit
495#define ext4_find_next_zero_bit ext2_find_next_zero_bit
aa02ad67 496#define ext4_find_next_bit ext2_find_next_bit
ac27a0ec
DK		 497
498/*
499 * Maximal mount counts between two filesystem checks
500 */
617ba13b
MC		 501#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
502#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
ac27a0ec
DK		 503
504/*
505 * Behaviour when detecting errors
506 */
617ba13b
MC		 507#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
508#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
509#define EXT4_ERRORS_PANIC 3 /* Panic */
510#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
ac27a0ec
DK		 511
512/*
513 * Structure of the super block
514 */
617ba13b 515struct ext4_super_block {
ac27a0ec 516/*00*/ __le32 s_inodes_count; /* Inodes count */
6bc9feff 517 __le32 s_blocks_count_lo; /* Blocks count */
308ba3ec
AK		 518 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
519 __le32 s_free_blocks_count_lo; /* Free blocks count */
ac27a0ec
DK		 520/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
521 __le32 s_first_data_block; /* First Data Block */
522 __le32 s_log_block_size; /* Block size */
f077d0d7 523 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
ac27a0ec 524/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
f077d0d7 525 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
ac27a0ec
DK		 526 __le32 s_inodes_per_group; /* # Inodes per group */
527 __le32 s_mtime; /* Mount time */
528/*30*/ __le32 s_wtime; /* Write time */
529 __le16 s_mnt_count; /* Mount count */
530 __le16 s_max_mnt_count; /* Maximal mount count */
531 __le16 s_magic; /* Magic signature */
532 __le16 s_state; /* File system state */
533 __le16 s_errors; /* Behaviour when detecting errors */
534 __le16 s_minor_rev_level; /* minor revision level */
535/*40*/ __le32 s_lastcheck; /* time of last check */
536 __le32 s_checkinterval; /* max. time between checks */
537 __le32 s_creator_os; /* OS */
538 __le32 s_rev_level; /* Revision level */
539/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
540 __le16 s_def_resgid; /* Default gid for reserved blocks */
541 /*
617ba13b 542 * These fields are for EXT4_DYNAMIC_REV superblocks only.
ac27a0ec
DK		 543 *
544 * Note: the difference between the compatible feature set and
545 * the incompatible feature set is that if there is a bit set
546 * in the incompatible feature set that the kernel doesn't
547 * know about, it should refuse to mount the filesystem.
548 *
549 * e2fsck's requirements are more strict; if it doesn't know
550 * about a feature in either the compatible or incompatible
551 * feature set, it must abort and not try to meddle with
552 * things it doesn't understand...
553 */
554 __le32 s_first_ino; /* First non-reserved inode */
0d1ee42f 555 __le16 s_inode_size; /* size of inode structure */
ac27a0ec
DK		 556 __le16 s_block_group_nr; /* block group # of this superblock */
557 __le32 s_feature_compat; /* compatible feature set */
558/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
559 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
560/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
561/*78*/ char s_volume_name[16]; /* volume name */
562/*88*/ char s_last_mounted[64]; /* directory where last mounted */
563/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
564 /*
565 * Performance hints. Directory preallocation should only
617ba13b 566 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
ac27a0ec
DK		 567 */
568 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
569 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
570 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
571 /*
617ba13b 572 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
ac27a0ec
DK		 573 */
574/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
575/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
576 __le32 s_journal_dev; /* device number of journal file */
577 __le32 s_last_orphan; /* start of list of inodes to delete */
578 __le32 s_hash_seed[4]; /* HTREE hash seed */
579 __u8 s_def_hash_version; /* Default hash version to use */
580 __u8 s_reserved_char_pad;
0d1ee42f 581 __le16 s_desc_size; /* size of group descriptor */
bd81d8ee 582/*100*/ __le32 s_default_mount_opts;
ac27a0ec 583 __le32 s_first_meta_bg; /* First metablock block group */
bd81d8ee
LV		 584 __le32 s_mkfs_time; /* When the filesystem was created */
585 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
586 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
587/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
588 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
589 __le32 s_free_blocks_count_hi; /* Free blocks count */
c1bddad9
AK		 590 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
591 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
592 __le32 s_flags; /* Miscellaneous flags */
593 __le16 s_raid_stride; /* RAID stride */
594 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
595 __le64 s_mmp_block; /* Block for multi-mount protection */
596 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
436bd75e 597 __u32 s_reserved[163]; /* Padding to the end of the block */
ac27a0ec
DK		 598};
599
600#ifdef __KERNEL__
617ba13b 601static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
ac27a0ec
DK		 602{
603 return sb->s_fs_info;
604}
617ba13b 605static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
ac27a0ec 606{
617ba13b 607 return container_of(inode, struct ext4_inode_info, vfs_inode);
ac27a0ec
DK		 608}
609
ef7f3835
KS		 610static inline struct timespec ext4_current_time(struct inode *inode)
611{
612 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
613 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
614}
615
616
617ba13b 617static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
ac27a0ec 618{
617ba13b
MC		 619 return ino == EXT4_ROOT_INO ||
620 ino == EXT4_JOURNAL_INO ||
621 ino == EXT4_RESIZE_INO ||
622 (ino >= EXT4_FIRST_INO(sb) &&
623 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
ac27a0ec
DK		 624}
625#else
617ba13b 626/* Assume that user mode programs are passing in an ext4fs superblock, not
ac27a0ec
DK		 627 * a kernel struct super_block. This will allow us to call the feature-test
628 * macros from user land. */
617ba13b 629#define EXT4_SB(sb) (sb)
ac27a0ec
DK		 630#endif
631
617ba13b 632#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
ac27a0ec
DK		 633
634/*
635 * Codes for operating systems
636 */
617ba13b
MC		 637#define EXT4_OS_LINUX 0
638#define EXT4_OS_HURD 1
639#define EXT4_OS_MASIX 2
640#define EXT4_OS_FREEBSD 3
641#define EXT4_OS_LITES 4
ac27a0ec
DK		 642
643/*
644 * Revision levels
645 */
617ba13b
MC		 646#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
647#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
ac27a0ec 648
617ba13b
MC		 649#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
650#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
ac27a0ec 651
617ba13b 652#define EXT4_GOOD_OLD_INODE_SIZE 128
ac27a0ec
DK		 653
654/*
655 * Feature set definitions
656 */
657
617ba13b
MC		 658#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
659 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
660#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
661 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
662#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
663 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
664#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
665 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
666#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
667 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
668#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
669 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
670#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
671 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
672#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
673 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
674#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
675 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
676
677#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
678#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
679#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
680#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
681#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
682#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
683
684#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
685#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
686#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
0fc1b451 687#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
717d50e4 688#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
f8628a14 689#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
ef7f3835 690#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
617ba13b
MC		 691
692#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
693#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
694#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
695#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
696#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
a86c6181 697#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
bd81d8ee 698#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
0fc1b451 699#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
ce421581 700#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
617ba13b
MC		 701
702#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
703#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
704 EXT4_FEATURE_INCOMPAT_RECOVER| \
a86c6181 705 EXT4_FEATURE_INCOMPAT_META_BG| \
bd81d8ee 706 EXT4_FEATURE_INCOMPAT_EXTENTS| \
ce421581
JS		 707 EXT4_FEATURE_INCOMPAT_64BIT| \
708 EXT4_FEATURE_INCOMPAT_FLEX_BG)
617ba13b
MC		 709#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
710 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
717d50e4 711 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
f8628a14 712 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
ef7f3835 713 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
0fc1b451
AK		 714 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
715 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
ac27a0ec
DK		 716
717/*
718 * Default values for user and/or group using reserved blocks
719 */
617ba13b
MC		 720#define EXT4_DEF_RESUID 0
721#define EXT4_DEF_RESGID 0
ac27a0ec
DK		 722
723/*
724 * Default mount options
725 */
617ba13b
MC		 726#define EXT4_DEFM_DEBUG 0x0001
727#define EXT4_DEFM_BSDGROUPS 0x0002
728#define EXT4_DEFM_XATTR_USER 0x0004
729#define EXT4_DEFM_ACL 0x0008
730#define EXT4_DEFM_UID16 0x0010
731#define EXT4_DEFM_JMODE 0x0060
732#define EXT4_DEFM_JMODE_DATA 0x0020
733#define EXT4_DEFM_JMODE_ORDERED 0x0040
734#define EXT4_DEFM_JMODE_WBACK 0x0060
ac27a0ec
DK		 735
736/*
737 * Structure of a directory entry
738 */
617ba13b 739#define EXT4_NAME_LEN 255
ac27a0ec 740
617ba13b 741struct ext4_dir_entry {
ac27a0ec
DK		 742 __le32 inode; /* Inode number */
743 __le16 rec_len; /* Directory entry length */
744 __le16 name_len; /* Name length */
617ba13b 745 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 746};
747
748/*
617ba13b 749 * The new version of the directory entry. Since EXT4 structures are
ac27a0ec
DK		 750 * stored in intel byte order, and the name_len field could never be
751 * bigger than 255 chars, it's safe to reclaim the extra byte for the
752 * file_type field.
753 */
617ba13b 754struct ext4_dir_entry_2 {
ac27a0ec
DK		 755 __le32 inode; /* Inode number */
756 __le16 rec_len; /* Directory entry length */
757 __u8 name_len; /* Name length */
758 __u8 file_type;
617ba13b 759 char name[EXT4_NAME_LEN]; /* File name */
ac27a0ec
DK		 760};
761
762/*
617ba13b 763 * Ext4 directory file types. Only the low 3 bits are used. The
ac27a0ec
DK		 764 * other bits are reserved for now.
765 */
617ba13b
MC		 766#define EXT4_FT_UNKNOWN 0
767#define EXT4_FT_REG_FILE 1
768#define EXT4_FT_DIR 2
769#define EXT4_FT_CHRDEV 3
770#define EXT4_FT_BLKDEV 4
771#define EXT4_FT_FIFO 5
772#define EXT4_FT_SOCK 6
773#define EXT4_FT_SYMLINK 7
ac27a0ec 774
617ba13b 775#define EXT4_FT_MAX 8
ac27a0ec
DK		 776
777/*
617ba13b 778 * EXT4_DIR_PAD defines the directory entries boundaries
ac27a0ec
DK		 779 *
780 * NOTE: It must be a multiple of 4
781 */
617ba13b
MC		 782#define EXT4_DIR_PAD 4
783#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
784#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
785 ~EXT4_DIR_ROUND)
a72d7f83
JK		 786#define EXT4_MAX_REC_LEN ((1<<16)-1)
787
788static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
789{
790 unsigned len = le16_to_cpu(dlen);
791
792 if (len == EXT4_MAX_REC_LEN)
793 return 1 << 16;
794 return len;
795}
796
797static inline __le16 ext4_rec_len_to_disk(unsigned len)
798{
799 if (len == (1 << 16))
800 return cpu_to_le16(EXT4_MAX_REC_LEN);
801 else if (len > (1 << 16))
802 BUG();
803 return cpu_to_le16(len);
804}
805
ac27a0ec
DK		 806/*
807 * Hash Tree Directory indexing
808 * (c) Daniel Phillips, 2001
809 */
810
4074fe37
ES		 811#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
812 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
617ba13b
MC		 813 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
814#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
815#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
ac27a0ec
DK		 816
817/* Legal values for the dx_root hash_version field: */
818
819#define DX_HASH_LEGACY 0
820#define DX_HASH_HALF_MD4 1
821#define DX_HASH_TEA 2
822
823#ifdef __KERNEL__
824
825/* hash info structure used by the directory hash */
826struct dx_hash_info
827{
828 u32 hash;
829 u32 minor_hash;
830 int hash_version;
831 u32 *seed;
832};
833
617ba13b 834#define EXT4_HTREE_EOF 0x7fffffff
ac27a0ec
DK		 835
836/*
617ba13b 837 * Control parameters used by ext4_htree_next_block
ac27a0ec
DK		 838 */
839#define HASH_NB_ALWAYS 1
840
841
842/*
843 * Describe an inode's exact location on disk and in memory
844 */
617ba13b 845struct ext4_iloc
ac27a0ec
DK		 846{
847 struct buffer_head *bh;
848 unsigned long offset;
fd2d4291 849 ext4_group_t block_group;
ac27a0ec
DK		 850};
851
617ba13b 852static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
ac27a0ec 853{
617ba13b 854 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
ac27a0ec
DK		 855}
856
857/*
858 * This structure is stuffed into the struct file's private_data field
859 * for directories. It is where we put information so that we can do
860 * readdir operations in hash tree order.
861 */
862struct dir_private_info {
863 struct rb_root root;
864 struct rb_node *curr_node;
865 struct fname *extra_fname;
866 loff_t last_pos;
867 __u32 curr_hash;
868 __u32 curr_minor_hash;
869 __u32 next_hash;
870};
871
872/* calculate the first block number of the group */
617ba13b 873static inline ext4_fsblk_t
fd2d4291 874ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
ac27a0ec 875{
617ba13b
MC		 876 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
877 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
ac27a0ec
DK		 878}
879
880/*
881 * Special error return code only used by dx_probe() and its callers.
882 */
883#define ERR_BAD_DX_DIR -75000
884
72b64b59
AM		 885void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
886 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
3a5b2ecd 887
ac27a0ec
DK		 888/*
889 * Function prototypes
890 */
891
892/*
893 * Ok, these declarations are also in <linux/kernel.h> but none of the
617ba13b 894 * ext4 source programs needs to include it so they are duplicated here.
ac27a0ec 895 */
8c55e204
DK		 896# define NORET_TYPE /**/
897# define ATTRIB_NORET __attribute__((noreturn))
898# define NORET_AND noreturn,
ac27a0ec
DK		 899
900/* balloc.c */
3a5b2ecd
MC		 901extern unsigned int ext4_block_group(struct super_block *sb,
902 ext4_fsblk_t blocknr);
903extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
904 ext4_fsblk_t blocknr);
fd2d4291
AM		 905extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
906extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
907 ext4_group_t group);
617ba13b
MC		 908extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
909 ext4_fsblk_t goal, int *errp);
910extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
911 ext4_fsblk_t goal, unsigned long *count, int *errp);
1d03ec98
AK		 912extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
913 ext4_fsblk_t goal, unsigned long *count, int *errp);
617ba13b
MC		 914extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
915 ext4_fsblk_t block, unsigned long count);
916extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
917 ext4_fsblk_t block, unsigned long count,
ac27a0ec 918 unsigned long *pdquot_freed_blocks);
617ba13b
MC		 919extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
920extern void ext4_check_blocks_bitmap (struct super_block *);
921extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
fd2d4291 922 ext4_group_t block_group,
ac27a0ec 923 struct buffer_head ** bh);
617ba13b
MC		 924extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
925extern void ext4_init_block_alloc_info(struct inode *);
926extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
ac27a0ec
DK		 927
928/* dir.c */
617ba13b
MC		 929extern int ext4_check_dir_entry(const char *, struct inode *,
930 struct ext4_dir_entry_2 *,
ac27a0ec 931 struct buffer_head *, unsigned long);
617ba13b 932extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
ac27a0ec 933 __u32 minor_hash,
617ba13b
MC		 934 struct ext4_dir_entry_2 *dirent);
935extern void ext4_htree_free_dir_info(struct dir_private_info *p);
ac27a0ec
DK		 936
937/* fsync.c */
617ba13b 938extern int ext4_sync_file (struct file *, struct dentry *, int);
ac27a0ec
DK		 939
940/* hash.c */
617ba13b 941extern int ext4fs_dirhash(const char *name, int len, struct
ac27a0ec
DK		 942 dx_hash_info *hinfo);
943
944/* ialloc.c */
617ba13b
MC		 945extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
946extern void ext4_free_inode (handle_t *, struct inode *);
947extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
948extern unsigned long ext4_count_free_inodes (struct super_block *);
949extern unsigned long ext4_count_dirs (struct super_block *);
950extern void ext4_check_inodes_bitmap (struct super_block *);
951extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
ac27a0ec
DK		 952
953
954/* inode.c */
617ba13b
MC		 955int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
956 struct buffer_head *bh, ext4_fsblk_t blocknr);
725d26d3
AK		 957struct buffer_head *ext4_getblk(handle_t *, struct inode *,
958 ext4_lblk_t, int, int *);
959struct buffer_head *ext4_bread(handle_t *, struct inode *,
960 ext4_lblk_t, int, int *);
617ba13b 961int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
725d26d3
AK		 962 ext4_lblk_t iblock, unsigned long maxblocks,
963 struct buffer_head *bh_result,
964 int create, int extend_disksize);
ac27a0ec 965
617ba13b
MC		 966extern void ext4_read_inode (struct inode *);
967extern int ext4_write_inode (struct inode *, int);
968extern int ext4_setattr (struct dentry *, struct iattr *);
969extern void ext4_delete_inode (struct inode *);
970extern int ext4_sync_inode (handle_t *, struct inode *);
971extern void ext4_discard_reservation (struct inode *);
972extern void ext4_dirty_inode(struct inode *);
973extern int ext4_change_inode_journal_flag(struct inode *, int);
974extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
975extern void ext4_truncate (struct inode *);
976extern void ext4_set_inode_flags(struct inode *);
ff9ddf7e 977extern void ext4_get_inode_flags(struct ext4_inode_info *);
617ba13b 978extern void ext4_set_aops(struct inode *inode);
a86c6181
AT		 979extern int ext4_writepage_trans_blocks(struct inode *);
980extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
981 struct address_space *mapping, loff_t from);
ac27a0ec
DK		 982
983/* ioctl.c */
617ba13b 984extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
ac27a0ec 985 unsigned long);
617ba13b 986extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
ac27a0ec 987
c14c6fd5
AK		 988/* migrate.c */
989extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
990 unsigned long);
ac27a0ec 991/* namei.c */
617ba13b
MC		 992extern int ext4_orphan_add(handle_t *, struct inode *);
993extern int ext4_orphan_del(handle_t *, struct inode *);
994extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
ac27a0ec
DK		 995 __u32 start_minor_hash, __u32 *next_hash);
996
997/* resize.c */
617ba13b
MC		 998extern int ext4_group_add(struct super_block *sb,
999 struct ext4_new_group_data *input);
1000extern int ext4_group_extend(struct super_block *sb,
1001 struct ext4_super_block *es,
1002 ext4_fsblk_t n_blocks_count);
ac27a0ec
DK		 1003
1004/* super.c */
617ba13b 1005extern void ext4_error (struct super_block *, const char *, const char *, ...)
ac27a0ec 1006 __attribute__ ((format (printf, 3, 4)));
617ba13b
MC		 1007extern void __ext4_std_error (struct super_block *, const char *, int);
1008extern void ext4_abort (struct super_block *, const char *, const char *, ...)
ac27a0ec 1009 __attribute__ ((format (printf, 3, 4)));
617ba13b 1010extern void ext4_warning (struct super_block *, const char *, const char *, ...)
ac27a0ec 1011 __attribute__ ((format (printf, 3, 4)));
617ba13b 1012extern void ext4_update_dynamic_rev (struct super_block *sb);
99e6f829
AK		 1013extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1014 __u32 compat);
1015extern int ext4_update_rocompat_feature(handle_t *handle,
1016 struct super_block *sb, __u32 rocompat);
1017extern int ext4_update_incompat_feature(handle_t *handle,
1018 struct super_block *sb, __u32 incompat);
8fadc143
AR		 1019extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1020 struct ext4_group_desc *bg);
1021extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1022 struct ext4_group_desc *bg);
1023extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1024 struct ext4_group_desc *bg);
1025extern void ext4_block_bitmap_set(struct super_block *sb,
1026 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1027extern void ext4_inode_bitmap_set(struct super_block *sb,
1028 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1029extern void ext4_inode_table_set(struct super_block *sb,
1030 struct ext4_group_desc *bg, ext4_fsblk_t blk);
bd81d8ee
LV		 1031
1032static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1033{
1034 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
6bc9feff 1035 le32_to_cpu(es->s_blocks_count_lo);
bd81d8ee
LV		 1036}
1037
1038static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1039{
1040 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
308ba3ec 1041 le32_to_cpu(es->s_r_blocks_count_lo);
bd81d8ee
LV		 1042}
1043
1044static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1045{
1046 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
308ba3ec 1047 le32_to_cpu(es->s_free_blocks_count_lo);
bd81d8ee
LV		 1048}
1049
1050static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1051 ext4_fsblk_t blk)
1052{
6bc9feff 1053 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1054 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1055}
1056
1057static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1058 ext4_fsblk_t blk)
1059{
308ba3ec 1060 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1061 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1062}
1063
1064static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1065 ext4_fsblk_t blk)
1066{
308ba3ec 1067 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
bd81d8ee
LV		 1068 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1069}
1070
a48380f7
AK		 1071static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1072{
1073 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1074 le32_to_cpu(raw_inode->i_size_lo);
1075}
bd81d8ee 1076
a48380f7
AK		 1077static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1078{
1079 raw_inode->i_size_lo = cpu_to_le32(i_size);
1080 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1081}
ac27a0ec 1082
617ba13b 1083#define ext4_std_error(sb, errno) \
ac27a0ec
DK		 1084do { \
1085 if ((errno)) \
617ba13b 1086 __ext4_std_error((sb), __FUNCTION__, (errno)); \
ac27a0ec
DK		 1087} while (0)
1088
1089/*
1090 * Inodes and files operations
1091 */
1092
1093/* dir.c */
617ba13b 1094extern const struct file_operations ext4_dir_operations;
ac27a0ec
DK		 1095
1096/* file.c */
c5ef1c42 1097extern const struct inode_operations ext4_file_inode_operations;
617ba13b 1098extern const struct file_operations ext4_file_operations;
ac27a0ec
DK		 1099
1100/* namei.c */
c5ef1c42
AV		 1101extern const struct inode_operations ext4_dir_inode_operations;
1102extern const struct inode_operations ext4_special_inode_operations;
ac27a0ec
DK		 1103
1104/* symlink.c */
c5ef1c42
AV		 1105extern const struct inode_operations ext4_symlink_inode_operations;
1106extern const struct inode_operations ext4_fast_symlink_inode_operations;
ac27a0ec 1107
a86c6181
AT		 1108/* extents.c */
1109extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1110extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1111extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
725d26d3 1112 ext4_lblk_t iblock,
a86c6181
AT		 1113 unsigned long max_blocks, struct buffer_head *bh_result,
1114 int create, int extend_disksize);
1115extern void ext4_ext_truncate(struct inode *, struct page *);
1116extern void ext4_ext_init(struct super_block *);
1117extern void ext4_ext_release(struct super_block *);
a2df2a63
AA		 1118extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1119 loff_t len);
0e855ac8
AK		 1120extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1121 sector_t block, unsigned long max_blocks,
1122 struct buffer_head *bh, int create,
1123 int extend_disksize);
ac27a0ec
DK		 1124#endif /* __KERNEL__ */
1125
617ba13b 1126#endif /* _LINUX_EXT4_FS_H */
Linux 6.x block layer and io_uring tree(s)