2 * linux/include/linux/ext4_fs.h
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)
11 * linux/include/linux/minix_fs.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
16 #ifndef _LINUX_EXT4_FS_H
17 #define _LINUX_EXT4_FS_H
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
24 * The second extended filesystem constants/structures
28 * Define EXT4FS_DEBUG to produce debug messages
33 * Define EXT4_RESERVATION to reserve data blocks for expanding files
35 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
37 #define EXT4_MAX_RESERVE_BLOCKS 1027
38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
40 * Always enable hashed directories
42 #define CONFIG_EXT4_INDEX
48 #define ext4_debug(f, a...) \
50 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
51 __FILE__, __LINE__, __FUNCTION__); \
52 printk (KERN_DEBUG f, ## a); \
55 #define ext4_debug(f, a...) do {} while (0)
59 * Special inodes numbers
61 #define EXT4_BAD_INO 1 /* Bad blocks inode */
62 #define EXT4_ROOT_INO 2 /* Root inode */
63 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
64 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
65 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
66 #define EXT4_JOURNAL_INO 8 /* Journal inode */
68 /* First non-reserved inode for old ext4 filesystems */
69 #define EXT4_GOOD_OLD_FIRST_INO 11
72 * Maximal count of links to a file
74 #define EXT4_LINK_MAX 32000
77 * Macro-instructions used to manage several block sizes
79 #define EXT4_MIN_BLOCK_SIZE 1024
80 #define EXT4_MAX_BLOCK_SIZE 4096
81 #define EXT4_MIN_BLOCK_LOG_SIZE 10
83 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
85 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
87 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
89 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
91 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
94 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
95 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
96 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
98 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
99 EXT4_GOOD_OLD_INODE_SIZE : \
101 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
102 EXT4_GOOD_OLD_FIRST_INO : \
107 * Macro-instructions used to manage fragments
109 #define EXT4_MIN_FRAG_SIZE 1024
110 #define EXT4_MAX_FRAG_SIZE 4096
111 #define EXT4_MIN_FRAG_LOG_SIZE 10
113 # define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size)
114 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block)
116 # define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
117 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
121 * Structure of a blocks group descriptor
123 struct ext4_group_desc
125 __le32 bg_block_bitmap
; /* Blocks bitmap block */
126 __le32 bg_inode_bitmap
; /* Inodes bitmap block */
127 __le32 bg_inode_table
; /* Inodes table block */
128 __le16 bg_free_blocks_count
; /* Free blocks count */
129 __le16 bg_free_inodes_count
; /* Free inodes count */
130 __le16 bg_used_dirs_count
; /* Directories count */
132 __le32 bg_reserved
[3];
136 * Macro-instructions used to manage group descriptors
139 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
140 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
141 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
142 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
144 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
145 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (struct ext4_group_desc))
146 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
150 * Constants relative to the data blocks
152 #define EXT4_NDIR_BLOCKS 12
153 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
154 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
155 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
156 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
161 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
162 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
163 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
164 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
165 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
166 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
167 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
168 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
169 /* Reserved for compression usage... */
170 #define EXT4_DIRTY_FL 0x00000100
171 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
172 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
173 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
174 /* End compression flags --- maybe not all used */
175 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
176 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
177 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
178 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
179 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
180 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
181 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
182 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
184 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
185 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
188 * Inode dynamic state flags
190 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
191 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
192 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
194 /* Used to pass group descriptor data when online resize is done */
195 struct ext4_new_group_input
{
196 __u32 group
; /* Group number for this data */
197 __u32 block_bitmap
; /* Absolute block number of block bitmap */
198 __u32 inode_bitmap
; /* Absolute block number of inode bitmap */
199 __u32 inode_table
; /* Absolute block number of inode table start */
200 __u32 blocks_count
; /* Total number of blocks in this group */
201 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
205 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
206 struct ext4_new_group_data
{
212 __u16 reserved_blocks
;
214 __u32 free_blocks_count
;
221 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
222 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
223 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
224 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
225 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
226 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
227 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
228 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
229 #ifdef CONFIG_JBD_DEBUG
230 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
232 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
233 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
236 * ioctl commands in 32 bit emulation
238 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
239 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
240 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
241 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
242 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
243 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
244 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
245 #ifdef CONFIG_JBD_DEBUG
246 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
248 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
249 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
255 struct ext4_mount_options
{
256 unsigned long s_mount_opt
;
259 unsigned long s_commit_interval
;
262 char *s_qf_names
[MAXQUOTAS
];
267 * Structure of an inode on the disk
270 __le16 i_mode
; /* File mode */
271 __le16 i_uid
; /* Low 16 bits of Owner Uid */
272 __le32 i_size
; /* Size in bytes */
273 __le32 i_atime
; /* Access time */
274 __le32 i_ctime
; /* Creation time */
275 __le32 i_mtime
; /* Modification time */
276 __le32 i_dtime
; /* Deletion Time */
277 __le16 i_gid
; /* Low 16 bits of Group Id */
278 __le16 i_links_count
; /* Links count */
279 __le32 i_blocks
; /* Blocks count */
280 __le32 i_flags
; /* File flags */
286 __u32 h_i_translator
;
291 } osd1
; /* OS dependent 1 */
292 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
293 __le32 i_generation
; /* File version (for NFS) */
294 __le32 i_file_acl
; /* File ACL */
295 __le32 i_dir_acl
; /* Directory ACL */
296 __le32 i_faddr
; /* Fragment address */
299 __u8 l_i_frag
; /* Fragment number */
300 __u8 l_i_fsize
; /* Fragment size */
302 __le16 l_i_uid_high
; /* these 2 fields */
303 __le16 l_i_gid_high
; /* were reserved2[0] */
307 __u8 h_i_frag
; /* Fragment number */
308 __u8 h_i_fsize
; /* Fragment size */
315 __u8 m_i_frag
; /* Fragment number */
316 __u8 m_i_fsize
; /* Fragment size */
318 __u32 m_i_reserved2
[2];
320 } osd2
; /* OS dependent 2 */
321 __le16 i_extra_isize
;
325 #define i_size_high i_dir_acl
327 #if defined(__KERNEL__) || defined(__linux__)
328 #define i_reserved1 osd1.linux1.l_i_reserved1
329 #define i_frag osd2.linux2.l_i_frag
330 #define i_fsize osd2.linux2.l_i_fsize
331 #define i_uid_low i_uid
332 #define i_gid_low i_gid
333 #define i_uid_high osd2.linux2.l_i_uid_high
334 #define i_gid_high osd2.linux2.l_i_gid_high
335 #define i_reserved2 osd2.linux2.l_i_reserved2
337 #elif defined(__GNU__)
339 #define i_translator osd1.hurd1.h_i_translator
340 #define i_frag osd2.hurd2.h_i_frag;
341 #define i_fsize osd2.hurd2.h_i_fsize;
342 #define i_uid_high osd2.hurd2.h_i_uid_high
343 #define i_gid_high osd2.hurd2.h_i_gid_high
344 #define i_author osd2.hurd2.h_i_author
346 #elif defined(__masix__)
348 #define i_reserved1 osd1.masix1.m_i_reserved1
349 #define i_frag osd2.masix2.m_i_frag
350 #define i_fsize osd2.masix2.m_i_fsize
351 #define i_reserved2 osd2.masix2.m_i_reserved2
353 #endif /* defined(__KERNEL__) || defined(__linux__) */
358 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
359 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
360 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
365 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
366 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
367 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
368 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
369 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
370 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
371 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
372 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
373 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
374 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
375 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
376 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
377 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
378 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
379 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
380 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
381 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
382 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
383 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
384 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
385 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
386 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
387 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
388 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
389 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
391 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
392 #ifndef _LINUX_EXT2_FS_H
393 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
394 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
395 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
398 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
399 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
400 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
403 #define ext4_set_bit ext2_set_bit
404 #define ext4_set_bit_atomic ext2_set_bit_atomic
405 #define ext4_clear_bit ext2_clear_bit
406 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
407 #define ext4_test_bit ext2_test_bit
408 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
409 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
412 * Maximal mount counts between two filesystem checks
414 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
415 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
418 * Behaviour when detecting errors
420 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
421 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
422 #define EXT4_ERRORS_PANIC 3 /* Panic */
423 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
426 * Structure of the super block
428 struct ext4_super_block
{
429 /*00*/ __le32 s_inodes_count
; /* Inodes count */
430 __le32 s_blocks_count
; /* Blocks count */
431 __le32 s_r_blocks_count
; /* Reserved blocks count */
432 __le32 s_free_blocks_count
; /* Free blocks count */
433 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
434 __le32 s_first_data_block
; /* First Data Block */
435 __le32 s_log_block_size
; /* Block size */
436 __le32 s_log_frag_size
; /* Fragment size */
437 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
438 __le32 s_frags_per_group
; /* # Fragments per group */
439 __le32 s_inodes_per_group
; /* # Inodes per group */
440 __le32 s_mtime
; /* Mount time */
441 /*30*/ __le32 s_wtime
; /* Write time */
442 __le16 s_mnt_count
; /* Mount count */
443 __le16 s_max_mnt_count
; /* Maximal mount count */
444 __le16 s_magic
; /* Magic signature */
445 __le16 s_state
; /* File system state */
446 __le16 s_errors
; /* Behaviour when detecting errors */
447 __le16 s_minor_rev_level
; /* minor revision level */
448 /*40*/ __le32 s_lastcheck
; /* time of last check */
449 __le32 s_checkinterval
; /* max. time between checks */
450 __le32 s_creator_os
; /* OS */
451 __le32 s_rev_level
; /* Revision level */
452 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
453 __le16 s_def_resgid
; /* Default gid for reserved blocks */
455 * These fields are for EXT4_DYNAMIC_REV superblocks only.
457 * Note: the difference between the compatible feature set and
458 * the incompatible feature set is that if there is a bit set
459 * in the incompatible feature set that the kernel doesn't
460 * know about, it should refuse to mount the filesystem.
462 * e2fsck's requirements are more strict; if it doesn't know
463 * about a feature in either the compatible or incompatible
464 * feature set, it must abort and not try to meddle with
465 * things it doesn't understand...
467 __le32 s_first_ino
; /* First non-reserved inode */
468 __le16 s_inode_size
; /* size of inode structure */
469 __le16 s_block_group_nr
; /* block group # of this superblock */
470 __le32 s_feature_compat
; /* compatible feature set */
471 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
472 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
473 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
474 /*78*/ char s_volume_name
[16]; /* volume name */
475 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
476 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
478 * Performance hints. Directory preallocation should only
479 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
481 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
482 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
483 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
485 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
487 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
488 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
489 __le32 s_journal_dev
; /* device number of journal file */
490 __le32 s_last_orphan
; /* start of list of inodes to delete */
491 __le32 s_hash_seed
[4]; /* HTREE hash seed */
492 __u8 s_def_hash_version
; /* Default hash version to use */
493 __u8 s_reserved_char_pad
;
494 __u16 s_reserved_word_pad
;
495 __le32 s_default_mount_opts
;
496 __le32 s_first_meta_bg
; /* First metablock block group */
497 __u32 s_reserved
[190]; /* Padding to the end of the block */
501 #include <linux/ext4_fs_i.h>
502 #include <linux/ext4_fs_sb.h>
503 static inline struct ext4_sb_info
* EXT4_SB(struct super_block
*sb
)
505 return sb
->s_fs_info
;
507 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
509 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
512 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
514 return ino
== EXT4_ROOT_INO
||
515 ino
== EXT4_JOURNAL_INO
||
516 ino
== EXT4_RESIZE_INO
||
517 (ino
>= EXT4_FIRST_INO(sb
) &&
518 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
521 /* Assume that user mode programs are passing in an ext4fs superblock, not
522 * a kernel struct super_block. This will allow us to call the feature-test
523 * macros from user land. */
524 #define EXT4_SB(sb) (sb)
527 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
530 * Codes for operating systems
532 #define EXT4_OS_LINUX 0
533 #define EXT4_OS_HURD 1
534 #define EXT4_OS_MASIX 2
535 #define EXT4_OS_FREEBSD 3
536 #define EXT4_OS_LITES 4
541 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
542 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
544 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
545 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
547 #define EXT4_GOOD_OLD_INODE_SIZE 128
550 * Feature set definitions
553 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
554 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
555 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
556 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
557 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
558 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
559 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
560 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
561 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
562 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
563 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
564 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
565 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
566 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
567 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
568 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
569 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
570 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
572 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
573 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
574 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
575 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
576 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
577 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
579 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
580 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
581 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
583 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
584 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
585 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
586 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
587 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
588 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
590 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
591 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
592 EXT4_FEATURE_INCOMPAT_RECOVER| \
593 EXT4_FEATURE_INCOMPAT_META_BG| \
594 EXT4_FEATURE_INCOMPAT_EXTENTS)
595 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
596 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
597 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
600 * Default values for user and/or group using reserved blocks
602 #define EXT4_DEF_RESUID 0
603 #define EXT4_DEF_RESGID 0
606 * Default mount options
608 #define EXT4_DEFM_DEBUG 0x0001
609 #define EXT4_DEFM_BSDGROUPS 0x0002
610 #define EXT4_DEFM_XATTR_USER 0x0004
611 #define EXT4_DEFM_ACL 0x0008
612 #define EXT4_DEFM_UID16 0x0010
613 #define EXT4_DEFM_JMODE 0x0060
614 #define EXT4_DEFM_JMODE_DATA 0x0020
615 #define EXT4_DEFM_JMODE_ORDERED 0x0040
616 #define EXT4_DEFM_JMODE_WBACK 0x0060
619 * Structure of a directory entry
621 #define EXT4_NAME_LEN 255
623 struct ext4_dir_entry
{
624 __le32 inode
; /* Inode number */
625 __le16 rec_len
; /* Directory entry length */
626 __le16 name_len
; /* Name length */
627 char name
[EXT4_NAME_LEN
]; /* File name */
631 * The new version of the directory entry. Since EXT4 structures are
632 * stored in intel byte order, and the name_len field could never be
633 * bigger than 255 chars, it's safe to reclaim the extra byte for the
636 struct ext4_dir_entry_2
{
637 __le32 inode
; /* Inode number */
638 __le16 rec_len
; /* Directory entry length */
639 __u8 name_len
; /* Name length */
641 char name
[EXT4_NAME_LEN
]; /* File name */
645 * Ext4 directory file types. Only the low 3 bits are used. The
646 * other bits are reserved for now.
648 #define EXT4_FT_UNKNOWN 0
649 #define EXT4_FT_REG_FILE 1
650 #define EXT4_FT_DIR 2
651 #define EXT4_FT_CHRDEV 3
652 #define EXT4_FT_BLKDEV 4
653 #define EXT4_FT_FIFO 5
654 #define EXT4_FT_SOCK 6
655 #define EXT4_FT_SYMLINK 7
657 #define EXT4_FT_MAX 8
660 * EXT4_DIR_PAD defines the directory entries boundaries
662 * NOTE: It must be a multiple of 4
664 #define EXT4_DIR_PAD 4
665 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
666 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
669 * Hash Tree Directory indexing
670 * (c) Daniel Phillips, 2001
673 #ifdef CONFIG_EXT4_INDEX
674 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
675 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
676 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
677 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
678 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
681 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
682 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
685 /* Legal values for the dx_root hash_version field: */
687 #define DX_HASH_LEGACY 0
688 #define DX_HASH_HALF_MD4 1
689 #define DX_HASH_TEA 2
693 /* hash info structure used by the directory hash */
702 #define EXT4_HTREE_EOF 0x7fffffff
705 * Control parameters used by ext4_htree_next_block
707 #define HASH_NB_ALWAYS 1
711 * Describe an inode's exact location on disk and in memory
715 struct buffer_head
*bh
;
716 unsigned long offset
;
717 unsigned long block_group
;
720 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
722 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
726 * This structure is stuffed into the struct file's private_data field
727 * for directories. It is where we put information so that we can do
728 * readdir operations in hash tree order.
730 struct dir_private_info
{
732 struct rb_node
*curr_node
;
733 struct fname
*extra_fname
;
736 __u32 curr_minor_hash
;
740 /* calculate the first block number of the group */
741 static inline ext4_fsblk_t
742 ext4_group_first_block_no(struct super_block
*sb
, unsigned long group_no
)
744 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
745 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
749 * Special error return code only used by dx_probe() and its callers.
751 #define ERR_BAD_DX_DIR -75000
754 * This function calculate the block group number and offset,
755 * given a block number
758 static inline void ext4_get_group_no_and_offset(struct super_block
* sb
,
759 ext4_fsblk_t blocknr
, unsigned long* blockgrpp
,
760 ext4_grpblk_t
*offsetp
)
762 struct ext4_super_block
*es
= EXT4_SB(sb
)->s_es
;
763 ext4_grpblk_t offset
;
765 blocknr
= blocknr
- le32_to_cpu(es
->s_first_data_block
);
766 offset
= sector_div(blocknr
, EXT4_BLOCKS_PER_GROUP(sb
));
770 *blockgrpp
= blocknr
;
775 * Function prototypes
779 * Ok, these declarations are also in <linux/kernel.h> but none of the
780 * ext4 source programs needs to include it so they are duplicated here.
782 # define NORET_TYPE /**/
783 # define ATTRIB_NORET __attribute__((noreturn))
784 # define NORET_AND noreturn,
787 extern unsigned int ext4_block_group(struct super_block
*sb
,
788 ext4_fsblk_t blocknr
);
789 extern ext4_grpblk_t
ext4_block_group_offset(struct super_block
*sb
,
790 ext4_fsblk_t blocknr
);
791 extern int ext4_bg_has_super(struct super_block
*sb
, int group
);
792 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
, int group
);
793 extern ext4_fsblk_t
ext4_new_block (handle_t
*handle
, struct inode
*inode
,
794 ext4_fsblk_t goal
, int *errp
);
795 extern ext4_fsblk_t
ext4_new_blocks (handle_t
*handle
, struct inode
*inode
,
796 ext4_fsblk_t goal
, unsigned long *count
, int *errp
);
797 extern void ext4_free_blocks (handle_t
*handle
, struct inode
*inode
,
798 ext4_fsblk_t block
, unsigned long count
);
799 extern void ext4_free_blocks_sb (handle_t
*handle
, struct super_block
*sb
,
800 ext4_fsblk_t block
, unsigned long count
,
801 unsigned long *pdquot_freed_blocks
);
802 extern ext4_fsblk_t
ext4_count_free_blocks (struct super_block
*);
803 extern void ext4_check_blocks_bitmap (struct super_block
*);
804 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
805 unsigned int block_group
,
806 struct buffer_head
** bh
);
807 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
808 extern void ext4_init_block_alloc_info(struct inode
*);
809 extern void ext4_rsv_window_add(struct super_block
*sb
, struct ext4_reserve_window_node
*rsv
);
812 extern int ext4_check_dir_entry(const char *, struct inode
*,
813 struct ext4_dir_entry_2
*,
814 struct buffer_head
*, unsigned long);
815 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
817 struct ext4_dir_entry_2
*dirent
);
818 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
821 extern int ext4_sync_file (struct file
*, struct dentry
*, int);
824 extern int ext4fs_dirhash(const char *name
, int len
, struct
825 dx_hash_info
*hinfo
);
828 extern struct inode
* ext4_new_inode (handle_t
*, struct inode
*, int);
829 extern void ext4_free_inode (handle_t
*, struct inode
*);
830 extern struct inode
* ext4_orphan_get (struct super_block
*, unsigned long);
831 extern unsigned long ext4_count_free_inodes (struct super_block
*);
832 extern unsigned long ext4_count_dirs (struct super_block
*);
833 extern void ext4_check_inodes_bitmap (struct super_block
*);
834 extern unsigned long ext4_count_free (struct buffer_head
*, unsigned);
838 int ext4_forget(handle_t
*handle
, int is_metadata
, struct inode
*inode
,
839 struct buffer_head
*bh
, ext4_fsblk_t blocknr
);
840 struct buffer_head
* ext4_getblk (handle_t
*, struct inode
*, long, int, int *);
841 struct buffer_head
* ext4_bread (handle_t
*, struct inode
*, int, int, int *);
842 int ext4_get_blocks_handle(handle_t
*handle
, struct inode
*inode
,
843 sector_t iblock
, unsigned long maxblocks
, struct buffer_head
*bh_result
,
844 int create
, int extend_disksize
);
846 extern void ext4_read_inode (struct inode
*);
847 extern int ext4_write_inode (struct inode
*, int);
848 extern int ext4_setattr (struct dentry
*, struct iattr
*);
849 extern void ext4_delete_inode (struct inode
*);
850 extern int ext4_sync_inode (handle_t
*, struct inode
*);
851 extern void ext4_discard_reservation (struct inode
*);
852 extern void ext4_dirty_inode(struct inode
*);
853 extern int ext4_change_inode_journal_flag(struct inode
*, int);
854 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
855 extern void ext4_truncate (struct inode
*);
856 extern void ext4_set_inode_flags(struct inode
*);
857 extern void ext4_set_aops(struct inode
*inode
);
858 extern int ext4_writepage_trans_blocks(struct inode
*);
859 extern int ext4_block_truncate_page(handle_t
*handle
, struct page
*page
,
860 struct address_space
*mapping
, loff_t from
);
863 extern int ext4_ioctl (struct inode
*, struct file
*, unsigned int,
865 extern long ext4_compat_ioctl (struct file
*, unsigned int, unsigned long);
868 extern int ext4_orphan_add(handle_t
*, struct inode
*);
869 extern int ext4_orphan_del(handle_t
*, struct inode
*);
870 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
871 __u32 start_minor_hash
, __u32
*next_hash
);
874 extern int ext4_group_add(struct super_block
*sb
,
875 struct ext4_new_group_data
*input
);
876 extern int ext4_group_extend(struct super_block
*sb
,
877 struct ext4_super_block
*es
,
878 ext4_fsblk_t n_blocks_count
);
881 extern void ext4_error (struct super_block
*, const char *, const char *, ...)
882 __attribute__ ((format (printf
, 3, 4)));
883 extern void __ext4_std_error (struct super_block
*, const char *, int);
884 extern void ext4_abort (struct super_block
*, const char *, const char *, ...)
885 __attribute__ ((format (printf
, 3, 4)));
886 extern void ext4_warning (struct super_block
*, const char *, const char *, ...)
887 __attribute__ ((format (printf
, 3, 4)));
888 extern void ext4_update_dynamic_rev (struct super_block
*sb
);
890 #define ext4_std_error(sb, errno) \
893 __ext4_std_error((sb), __FUNCTION__, (errno)); \
897 * Inodes and files operations
901 extern const struct file_operations ext4_dir_operations
;
904 extern struct inode_operations ext4_file_inode_operations
;
905 extern const struct file_operations ext4_file_operations
;
908 extern struct inode_operations ext4_dir_inode_operations
;
909 extern struct inode_operations ext4_special_inode_operations
;
912 extern struct inode_operations ext4_symlink_inode_operations
;
913 extern struct inode_operations ext4_fast_symlink_inode_operations
;
916 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
917 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
918 extern int ext4_ext_get_blocks(handle_t
*handle
, struct inode
*inode
,
920 unsigned long max_blocks
, struct buffer_head
*bh_result
,
921 int create
, int extend_disksize
);
922 extern void ext4_ext_truncate(struct inode
*, struct page
*);
923 extern void ext4_ext_init(struct super_block
*);
924 extern void ext4_ext_release(struct super_block
*);
926 ext4_get_blocks_wrap(handle_t
*handle
, struct inode
*inode
, sector_t block
,
927 unsigned long max_blocks
, struct buffer_head
*bh
,
928 int create
, int extend_disksize
)
930 if (EXT4_I(inode
)->i_flags
& EXT4_EXTENTS_FL
)
931 return ext4_ext_get_blocks(handle
, inode
, block
, max_blocks
,
932 bh
, create
, extend_disksize
);
933 return ext4_get_blocks_handle(handle
, inode
, block
, max_blocks
, bh
,
934 create
, extend_disksize
);
938 #endif /* __KERNEL__ */
940 #endif /* _LINUX_EXT4_FS_H */