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/magic.h>
23 * The second extended filesystem constants/structures
27 * Define EXT4FS_DEBUG to produce debug messages
32 * Define EXT4_RESERVATION to reserve data blocks for expanding files
34 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
36 #define EXT4_MAX_RESERVE_BLOCKS 1027
37 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
39 * Always enable hashed directories
41 #define CONFIG_EXT4_INDEX
47 #define ext4_debug(f, a...) \
49 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
50 __FILE__, __LINE__, __FUNCTION__); \
51 printk (KERN_DEBUG f, ## a); \
54 #define ext4_debug(f, a...) do {} while (0)
58 * Special inodes numbers
60 #define EXT4_BAD_INO 1 /* Bad blocks inode */
61 #define EXT4_ROOT_INO 2 /* Root inode */
62 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
63 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
64 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
65 #define EXT4_JOURNAL_INO 8 /* Journal inode */
67 /* First non-reserved inode for old ext4 filesystems */
68 #define EXT4_GOOD_OLD_FIRST_INO 11
71 * Maximal count of links to a file
73 #define EXT4_LINK_MAX 32000
76 * Macro-instructions used to manage several block sizes
78 #define EXT4_MIN_BLOCK_SIZE 1024
79 #define EXT4_MAX_BLOCK_SIZE 4096
80 #define EXT4_MIN_BLOCK_LOG_SIZE 10
82 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
84 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
86 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
88 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
90 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
93 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
94 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
95 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
97 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
98 EXT4_GOOD_OLD_INODE_SIZE : \
100 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
101 EXT4_GOOD_OLD_FIRST_INO : \
106 * Macro-instructions used to manage fragments
108 #define EXT4_MIN_FRAG_SIZE 1024
109 #define EXT4_MAX_FRAG_SIZE 4096
110 #define EXT4_MIN_FRAG_LOG_SIZE 10
112 # define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size)
113 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block)
115 # define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
116 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
120 * Structure of a blocks group descriptor
122 struct ext4_group_desc
124 __le32 bg_block_bitmap
; /* Blocks bitmap block */
125 __le32 bg_inode_bitmap
; /* Inodes bitmap block */
126 __le32 bg_inode_table
; /* Inodes table block */
127 __le16 bg_free_blocks_count
; /* Free blocks count */
128 __le16 bg_free_inodes_count
; /* Free inodes count */
129 __le16 bg_used_dirs_count
; /* Directories count */
131 __le32 bg_reserved
[3];
135 * Macro-instructions used to manage group descriptors
138 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
139 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
140 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
141 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
143 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
144 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (struct ext4_group_desc))
145 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
149 * Constants relative to the data blocks
151 #define EXT4_NDIR_BLOCKS 12
152 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
153 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
154 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
155 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
160 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
161 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
162 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
163 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
164 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
165 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
166 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
167 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
168 /* Reserved for compression usage... */
169 #define EXT4_DIRTY_FL 0x00000100
170 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
171 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
172 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
173 /* End compression flags --- maybe not all used */
174 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
175 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
176 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
177 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
178 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
179 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
180 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
181 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
183 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
184 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
187 * Inode dynamic state flags
189 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
190 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
191 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
193 /* Used to pass group descriptor data when online resize is done */
194 struct ext4_new_group_input
{
195 __u32 group
; /* Group number for this data */
196 __u32 block_bitmap
; /* Absolute block number of block bitmap */
197 __u32 inode_bitmap
; /* Absolute block number of inode bitmap */
198 __u32 inode_table
; /* Absolute block number of inode table start */
199 __u32 blocks_count
; /* Total number of blocks in this group */
200 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
204 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
205 struct ext4_new_group_data
{
211 __u16 reserved_blocks
;
213 __u32 free_blocks_count
;
220 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
221 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
222 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
223 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
224 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
225 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
226 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
227 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
228 #ifdef CONFIG_JBD_DEBUG
229 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
231 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
232 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
235 * ioctl commands in 32 bit emulation
237 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
238 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
239 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
240 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
241 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
242 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
243 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
244 #ifdef CONFIG_JBD_DEBUG
245 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
247 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
248 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
254 struct ext4_mount_options
{
255 unsigned long s_mount_opt
;
258 unsigned long s_commit_interval
;
261 char *s_qf_names
[MAXQUOTAS
];
266 * Structure of an inode on the disk
269 __le16 i_mode
; /* File mode */
270 __le16 i_uid
; /* Low 16 bits of Owner Uid */
271 __le32 i_size
; /* Size in bytes */
272 __le32 i_atime
; /* Access time */
273 __le32 i_ctime
; /* Creation time */
274 __le32 i_mtime
; /* Modification time */
275 __le32 i_dtime
; /* Deletion Time */
276 __le16 i_gid
; /* Low 16 bits of Group Id */
277 __le16 i_links_count
; /* Links count */
278 __le32 i_blocks
; /* Blocks count */
279 __le32 i_flags
; /* File flags */
285 __u32 h_i_translator
;
290 } osd1
; /* OS dependent 1 */
291 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
292 __le32 i_generation
; /* File version (for NFS) */
293 __le32 i_file_acl
; /* File ACL */
294 __le32 i_dir_acl
; /* Directory ACL */
295 __le32 i_faddr
; /* Fragment address */
298 __u8 l_i_frag
; /* Fragment number */
299 __u8 l_i_fsize
; /* Fragment size */
301 __le16 l_i_uid_high
; /* these 2 fields */
302 __le16 l_i_gid_high
; /* were reserved2[0] */
306 __u8 h_i_frag
; /* Fragment number */
307 __u8 h_i_fsize
; /* Fragment size */
314 __u8 m_i_frag
; /* Fragment number */
315 __u8 m_i_fsize
; /* Fragment size */
317 __u32 m_i_reserved2
[2];
319 } osd2
; /* OS dependent 2 */
320 __le16 i_extra_isize
;
324 #define i_size_high i_dir_acl
326 #if defined(__KERNEL__) || defined(__linux__)
327 #define i_reserved1 osd1.linux1.l_i_reserved1
328 #define i_frag osd2.linux2.l_i_frag
329 #define i_fsize osd2.linux2.l_i_fsize
330 #define i_uid_low i_uid
331 #define i_gid_low i_gid
332 #define i_uid_high osd2.linux2.l_i_uid_high
333 #define i_gid_high osd2.linux2.l_i_gid_high
334 #define i_reserved2 osd2.linux2.l_i_reserved2
336 #elif defined(__GNU__)
338 #define i_translator osd1.hurd1.h_i_translator
339 #define i_frag osd2.hurd2.h_i_frag;
340 #define i_fsize osd2.hurd2.h_i_fsize;
341 #define i_uid_high osd2.hurd2.h_i_uid_high
342 #define i_gid_high osd2.hurd2.h_i_gid_high
343 #define i_author osd2.hurd2.h_i_author
345 #elif defined(__masix__)
347 #define i_reserved1 osd1.masix1.m_i_reserved1
348 #define i_frag osd2.masix2.m_i_frag
349 #define i_fsize osd2.masix2.m_i_fsize
350 #define i_reserved2 osd2.masix2.m_i_reserved2
352 #endif /* defined(__KERNEL__) || defined(__linux__) */
357 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
358 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
359 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
364 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
365 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
366 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
367 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
368 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
369 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
370 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
371 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
372 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
373 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
374 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
375 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
376 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
377 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
378 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
379 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
380 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
381 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
382 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
383 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
384 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
385 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
386 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
387 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
388 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
390 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
391 #ifndef _LINUX_EXT2_FS_H
392 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
393 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
394 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
397 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
398 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
399 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
402 #define ext4_set_bit ext2_set_bit
403 #define ext4_set_bit_atomic ext2_set_bit_atomic
404 #define ext4_clear_bit ext2_clear_bit
405 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
406 #define ext4_test_bit ext2_test_bit
407 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
408 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
411 * Maximal mount counts between two filesystem checks
413 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
414 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
417 * Behaviour when detecting errors
419 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
420 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
421 #define EXT4_ERRORS_PANIC 3 /* Panic */
422 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
425 * Structure of the super block
427 struct ext4_super_block
{
428 /*00*/ __le32 s_inodes_count
; /* Inodes count */
429 __le32 s_blocks_count
; /* Blocks count */
430 __le32 s_r_blocks_count
; /* Reserved blocks count */
431 __le32 s_free_blocks_count
; /* Free blocks count */
432 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
433 __le32 s_first_data_block
; /* First Data Block */
434 __le32 s_log_block_size
; /* Block size */
435 __le32 s_log_frag_size
; /* Fragment size */
436 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
437 __le32 s_frags_per_group
; /* # Fragments per group */
438 __le32 s_inodes_per_group
; /* # Inodes per group */
439 __le32 s_mtime
; /* Mount time */
440 /*30*/ __le32 s_wtime
; /* Write time */
441 __le16 s_mnt_count
; /* Mount count */
442 __le16 s_max_mnt_count
; /* Maximal mount count */
443 __le16 s_magic
; /* Magic signature */
444 __le16 s_state
; /* File system state */
445 __le16 s_errors
; /* Behaviour when detecting errors */
446 __le16 s_minor_rev_level
; /* minor revision level */
447 /*40*/ __le32 s_lastcheck
; /* time of last check */
448 __le32 s_checkinterval
; /* max. time between checks */
449 __le32 s_creator_os
; /* OS */
450 __le32 s_rev_level
; /* Revision level */
451 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
452 __le16 s_def_resgid
; /* Default gid for reserved blocks */
454 * These fields are for EXT4_DYNAMIC_REV superblocks only.
456 * Note: the difference between the compatible feature set and
457 * the incompatible feature set is that if there is a bit set
458 * in the incompatible feature set that the kernel doesn't
459 * know about, it should refuse to mount the filesystem.
461 * e2fsck's requirements are more strict; if it doesn't know
462 * about a feature in either the compatible or incompatible
463 * feature set, it must abort and not try to meddle with
464 * things it doesn't understand...
466 __le32 s_first_ino
; /* First non-reserved inode */
467 __le16 s_inode_size
; /* size of inode structure */
468 __le16 s_block_group_nr
; /* block group # of this superblock */
469 __le32 s_feature_compat
; /* compatible feature set */
470 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
471 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
472 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
473 /*78*/ char s_volume_name
[16]; /* volume name */
474 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
475 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
477 * Performance hints. Directory preallocation should only
478 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
480 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
481 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
482 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
484 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
486 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
487 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
488 __le32 s_journal_dev
; /* device number of journal file */
489 __le32 s_last_orphan
; /* start of list of inodes to delete */
490 __le32 s_hash_seed
[4]; /* HTREE hash seed */
491 __u8 s_def_hash_version
; /* Default hash version to use */
492 __u8 s_reserved_char_pad
;
493 __u16 s_reserved_word_pad
;
494 __le32 s_default_mount_opts
;
495 __le32 s_first_meta_bg
; /* First metablock block group */
496 __u32 s_reserved
[190]; /* Padding to the end of the block */
500 #include <linux/ext4_fs_i.h>
501 #include <linux/ext4_fs_sb.h>
502 static inline struct ext4_sb_info
* EXT4_SB(struct super_block
*sb
)
504 return sb
->s_fs_info
;
506 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
508 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
511 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
513 return ino
== EXT4_ROOT_INO
||
514 ino
== EXT4_JOURNAL_INO
||
515 ino
== EXT4_RESIZE_INO
||
516 (ino
>= EXT4_FIRST_INO(sb
) &&
517 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
520 /* Assume that user mode programs are passing in an ext4fs superblock, not
521 * a kernel struct super_block. This will allow us to call the feature-test
522 * macros from user land. */
523 #define EXT4_SB(sb) (sb)
526 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
529 * Codes for operating systems
531 #define EXT4_OS_LINUX 0
532 #define EXT4_OS_HURD 1
533 #define EXT4_OS_MASIX 2
534 #define EXT4_OS_FREEBSD 3
535 #define EXT4_OS_LITES 4
540 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
541 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
543 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
544 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
546 #define EXT4_GOOD_OLD_INODE_SIZE 128
549 * Feature set definitions
552 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
553 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
554 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
555 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
556 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
557 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
558 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
559 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
560 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
561 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
562 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
563 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
564 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
565 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
566 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
567 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
568 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
569 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
571 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
572 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
573 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
574 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
575 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
576 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
578 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
579 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
580 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
582 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
583 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
584 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
585 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
586 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
587 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
589 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
590 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
591 EXT4_FEATURE_INCOMPAT_RECOVER| \
592 EXT4_FEATURE_INCOMPAT_META_BG| \
593 EXT4_FEATURE_INCOMPAT_EXTENTS)
594 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
595 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
596 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
599 * Default values for user and/or group using reserved blocks
601 #define EXT4_DEF_RESUID 0
602 #define EXT4_DEF_RESGID 0
605 * Default mount options
607 #define EXT4_DEFM_DEBUG 0x0001
608 #define EXT4_DEFM_BSDGROUPS 0x0002
609 #define EXT4_DEFM_XATTR_USER 0x0004
610 #define EXT4_DEFM_ACL 0x0008
611 #define EXT4_DEFM_UID16 0x0010
612 #define EXT4_DEFM_JMODE 0x0060
613 #define EXT4_DEFM_JMODE_DATA 0x0020
614 #define EXT4_DEFM_JMODE_ORDERED 0x0040
615 #define EXT4_DEFM_JMODE_WBACK 0x0060
618 * Structure of a directory entry
620 #define EXT4_NAME_LEN 255
622 struct ext4_dir_entry
{
623 __le32 inode
; /* Inode number */
624 __le16 rec_len
; /* Directory entry length */
625 __le16 name_len
; /* Name length */
626 char name
[EXT4_NAME_LEN
]; /* File name */
630 * The new version of the directory entry. Since EXT4 structures are
631 * stored in intel byte order, and the name_len field could never be
632 * bigger than 255 chars, it's safe to reclaim the extra byte for the
635 struct ext4_dir_entry_2
{
636 __le32 inode
; /* Inode number */
637 __le16 rec_len
; /* Directory entry length */
638 __u8 name_len
; /* Name length */
640 char name
[EXT4_NAME_LEN
]; /* File name */
644 * Ext4 directory file types. Only the low 3 bits are used. The
645 * other bits are reserved for now.
647 #define EXT4_FT_UNKNOWN 0
648 #define EXT4_FT_REG_FILE 1
649 #define EXT4_FT_DIR 2
650 #define EXT4_FT_CHRDEV 3
651 #define EXT4_FT_BLKDEV 4
652 #define EXT4_FT_FIFO 5
653 #define EXT4_FT_SOCK 6
654 #define EXT4_FT_SYMLINK 7
656 #define EXT4_FT_MAX 8
659 * EXT4_DIR_PAD defines the directory entries boundaries
661 * NOTE: It must be a multiple of 4
663 #define EXT4_DIR_PAD 4
664 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
665 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
668 * Hash Tree Directory indexing
669 * (c) Daniel Phillips, 2001
672 #ifdef CONFIG_EXT4_INDEX
673 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
674 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
675 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
676 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
677 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
680 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
681 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
684 /* Legal values for the dx_root hash_version field: */
686 #define DX_HASH_LEGACY 0
687 #define DX_HASH_HALF_MD4 1
688 #define DX_HASH_TEA 2
692 /* hash info structure used by the directory hash */
701 #define EXT4_HTREE_EOF 0x7fffffff
704 * Control parameters used by ext4_htree_next_block
706 #define HASH_NB_ALWAYS 1
710 * Describe an inode's exact location on disk and in memory
714 struct buffer_head
*bh
;
715 unsigned long offset
;
716 unsigned long block_group
;
719 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
721 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
725 * This structure is stuffed into the struct file's private_data field
726 * for directories. It is where we put information so that we can do
727 * readdir operations in hash tree order.
729 struct dir_private_info
{
731 struct rb_node
*curr_node
;
732 struct fname
*extra_fname
;
735 __u32 curr_minor_hash
;
739 /* calculate the first block number of the group */
740 static inline ext4_fsblk_t
741 ext4_group_first_block_no(struct super_block
*sb
, unsigned long group_no
)
743 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
744 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
748 * Special error return code only used by dx_probe() and its callers.
750 #define ERR_BAD_DX_DIR -75000
753 * Function prototypes
757 * Ok, these declarations are also in <linux/kernel.h> but none of the
758 * ext4 source programs needs to include it so they are duplicated here.
760 # define NORET_TYPE /**/
761 # define ATTRIB_NORET __attribute__((noreturn))
762 # define NORET_AND noreturn,
765 extern int ext4_bg_has_super(struct super_block
*sb
, int group
);
766 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
, int group
);
767 extern ext4_fsblk_t
ext4_new_block (handle_t
*handle
, struct inode
*inode
,
768 ext4_fsblk_t goal
, int *errp
);
769 extern ext4_fsblk_t
ext4_new_blocks (handle_t
*handle
, struct inode
*inode
,
770 ext4_fsblk_t goal
, unsigned long *count
, int *errp
);
771 extern void ext4_free_blocks (handle_t
*handle
, struct inode
*inode
,
772 ext4_fsblk_t block
, unsigned long count
);
773 extern void ext4_free_blocks_sb (handle_t
*handle
, struct super_block
*sb
,
774 ext4_fsblk_t block
, unsigned long count
,
775 unsigned long *pdquot_freed_blocks
);
776 extern ext4_fsblk_t
ext4_count_free_blocks (struct super_block
*);
777 extern void ext4_check_blocks_bitmap (struct super_block
*);
778 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
779 unsigned int block_group
,
780 struct buffer_head
** bh
);
781 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
782 extern void ext4_init_block_alloc_info(struct inode
*);
783 extern void ext4_rsv_window_add(struct super_block
*sb
, struct ext4_reserve_window_node
*rsv
);
786 extern int ext4_check_dir_entry(const char *, struct inode
*,
787 struct ext4_dir_entry_2
*,
788 struct buffer_head
*, unsigned long);
789 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
791 struct ext4_dir_entry_2
*dirent
);
792 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
795 extern int ext4_sync_file (struct file
*, struct dentry
*, int);
798 extern int ext4fs_dirhash(const char *name
, int len
, struct
799 dx_hash_info
*hinfo
);
802 extern struct inode
* ext4_new_inode (handle_t
*, struct inode
*, int);
803 extern void ext4_free_inode (handle_t
*, struct inode
*);
804 extern struct inode
* ext4_orphan_get (struct super_block
*, unsigned long);
805 extern unsigned long ext4_count_free_inodes (struct super_block
*);
806 extern unsigned long ext4_count_dirs (struct super_block
*);
807 extern void ext4_check_inodes_bitmap (struct super_block
*);
808 extern unsigned long ext4_count_free (struct buffer_head
*, unsigned);
812 int ext4_forget(handle_t
*handle
, int is_metadata
, struct inode
*inode
,
813 struct buffer_head
*bh
, ext4_fsblk_t blocknr
);
814 struct buffer_head
* ext4_getblk (handle_t
*, struct inode
*, long, int, int *);
815 struct buffer_head
* ext4_bread (handle_t
*, struct inode
*, int, int, int *);
816 int ext4_get_blocks_handle(handle_t
*handle
, struct inode
*inode
,
817 sector_t iblock
, unsigned long maxblocks
, struct buffer_head
*bh_result
,
818 int create
, int extend_disksize
);
820 extern void ext4_read_inode (struct inode
*);
821 extern int ext4_write_inode (struct inode
*, int);
822 extern int ext4_setattr (struct dentry
*, struct iattr
*);
823 extern void ext4_delete_inode (struct inode
*);
824 extern int ext4_sync_inode (handle_t
*, struct inode
*);
825 extern void ext4_discard_reservation (struct inode
*);
826 extern void ext4_dirty_inode(struct inode
*);
827 extern int ext4_change_inode_journal_flag(struct inode
*, int);
828 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
829 extern void ext4_truncate (struct inode
*);
830 extern void ext4_set_inode_flags(struct inode
*);
831 extern void ext4_set_aops(struct inode
*inode
);
832 extern int ext4_writepage_trans_blocks(struct inode
*);
833 extern int ext4_block_truncate_page(handle_t
*handle
, struct page
*page
,
834 struct address_space
*mapping
, loff_t from
);
837 extern int ext4_ioctl (struct inode
*, struct file
*, unsigned int,
839 extern long ext4_compat_ioctl (struct file
*, unsigned int, unsigned long);
842 extern int ext4_orphan_add(handle_t
*, struct inode
*);
843 extern int ext4_orphan_del(handle_t
*, struct inode
*);
844 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
845 __u32 start_minor_hash
, __u32
*next_hash
);
848 extern int ext4_group_add(struct super_block
*sb
,
849 struct ext4_new_group_data
*input
);
850 extern int ext4_group_extend(struct super_block
*sb
,
851 struct ext4_super_block
*es
,
852 ext4_fsblk_t n_blocks_count
);
855 extern void ext4_error (struct super_block
*, const char *, const char *, ...)
856 __attribute__ ((format (printf
, 3, 4)));
857 extern void __ext4_std_error (struct super_block
*, const char *, int);
858 extern void ext4_abort (struct super_block
*, const char *, const char *, ...)
859 __attribute__ ((format (printf
, 3, 4)));
860 extern void ext4_warning (struct super_block
*, const char *, const char *, ...)
861 __attribute__ ((format (printf
, 3, 4)));
862 extern void ext4_update_dynamic_rev (struct super_block
*sb
);
864 #define ext4_std_error(sb, errno) \
867 __ext4_std_error((sb), __FUNCTION__, (errno)); \
871 * Inodes and files operations
875 extern const struct file_operations ext4_dir_operations
;
878 extern struct inode_operations ext4_file_inode_operations
;
879 extern const struct file_operations ext4_file_operations
;
882 extern struct inode_operations ext4_dir_inode_operations
;
883 extern struct inode_operations ext4_special_inode_operations
;
886 extern struct inode_operations ext4_symlink_inode_operations
;
887 extern struct inode_operations ext4_fast_symlink_inode_operations
;
890 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
891 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
892 extern int ext4_ext_get_blocks(handle_t
*handle
, struct inode
*inode
,
894 unsigned long max_blocks
, struct buffer_head
*bh_result
,
895 int create
, int extend_disksize
);
896 extern void ext4_ext_truncate(struct inode
*, struct page
*);
897 extern void ext4_ext_init(struct super_block
*);
898 extern void ext4_ext_release(struct super_block
*);
900 ext4_get_blocks_wrap(handle_t
*handle
, struct inode
*inode
, sector_t block
,
901 unsigned long max_blocks
, struct buffer_head
*bh
,
902 int create
, int extend_disksize
)
904 if (EXT4_I(inode
)->i_flags
& EXT4_EXTENTS_FL
)
905 return ext4_ext_get_blocks(handle
, inode
, block
, max_blocks
,
906 bh
, create
, extend_disksize
);
907 return ext4_get_blocks_handle(handle
, inode
, block
, max_blocks
, bh
,
908 create
, extend_disksize
);
912 #endif /* __KERNEL__ */
914 #endif /* _LINUX_EXT4_FS_H */