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 : \
105 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
108 * Macro-instructions used to manage fragments
110 #define EXT4_MIN_FRAG_SIZE 1024
111 #define EXT4_MAX_FRAG_SIZE 4096
112 #define EXT4_MIN_FRAG_LOG_SIZE 10
114 # define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size)
115 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block)
117 # define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
118 # define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
122 * Structure of a blocks group descriptor
124 struct ext4_group_desc
126 __le32 bg_block_bitmap; /* Blocks bitmap block */
127 __le32 bg_inode_bitmap; /* Inodes bitmap block */
128 __le32 bg_inode_table; /* Inodes table block */
129 __le16 bg_free_blocks_count; /* Free blocks count */
130 __le16 bg_free_inodes_count; /* Free inodes count */
131 __le16 bg_used_dirs_count; /* Directories count */
133 __u32 bg_reserved[3];
134 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
135 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
136 __le32 bg_inode_table_hi; /* Inodes table block MSB */
140 #include <linux/ext4_fs_i.h>
141 #include <linux/ext4_fs_sb.h>
144 * Macro-instructions used to manage group descriptors
146 #define EXT4_MIN_DESC_SIZE 32
147 #define EXT4_MIN_DESC_SIZE_64BIT 64
148 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
149 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
151 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
152 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
153 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
154 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
156 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
157 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
158 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
162 * Constants relative to the data blocks
164 #define EXT4_NDIR_BLOCKS 12
165 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
166 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
167 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
168 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
173 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
174 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
175 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
176 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
177 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
178 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
179 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
180 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
181 /* Reserved for compression usage... */
182 #define EXT4_DIRTY_FL 0x00000100
183 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
184 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
185 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
186 /* End compression flags --- maybe not all used */
187 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
188 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
189 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
190 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
191 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
192 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
193 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
194 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
196 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
197 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
200 * Inode dynamic state flags
202 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
203 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
204 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
206 /* Used to pass group descriptor data when online resize is done */
207 struct ext4_new_group_input {
208 __u32 group; /* Group number for this data */
209 __u64 block_bitmap; /* Absolute block number of block bitmap */
210 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
211 __u64 inode_table; /* Absolute block number of inode table start */
212 __u32 blocks_count; /* Total number of blocks in this group */
213 __u16 reserved_blocks; /* Number of reserved blocks in this group */
217 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
218 struct ext4_new_group_data {
224 __u16 reserved_blocks;
226 __u32 free_blocks_count;
230 * Following is used by preallocation code to tell get_blocks() that we
231 * want uninitialzed extents.
233 #define EXT4_CREATE_UNINITIALIZED_EXT 2
238 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
239 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
240 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
241 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
242 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
243 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
244 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
245 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
246 #ifdef CONFIG_JBD_DEBUG
247 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
249 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
250 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
253 * ioctl commands in 32 bit emulation
255 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
256 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
257 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
258 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
259 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
260 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
261 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
262 #ifdef CONFIG_JBD_DEBUG
263 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
265 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
266 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
272 struct ext4_mount_options {
273 unsigned long s_mount_opt;
276 unsigned long s_commit_interval;
279 char *s_qf_names[MAXQUOTAS];
284 * Structure of an inode on the disk
287 __le16 i_mode; /* File mode */
288 __le16 i_uid; /* Low 16 bits of Owner Uid */
289 __le32 i_size; /* Size in bytes */
290 __le32 i_atime; /* Access time */
291 __le32 i_ctime; /* Creation time */
292 __le32 i_mtime; /* Modification time */
293 __le32 i_dtime; /* Deletion Time */
294 __le16 i_gid; /* Low 16 bits of Group Id */
295 __le16 i_links_count; /* Links count */
296 __le32 i_blocks; /* Blocks count */
297 __le32 i_flags; /* File flags */
303 __u32 h_i_translator;
308 } osd1; /* OS dependent 1 */
309 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
310 __le32 i_generation; /* File version (for NFS) */
311 __le32 i_file_acl; /* File ACL */
312 __le32 i_dir_acl; /* Directory ACL */
313 __le32 i_faddr; /* Fragment address */
316 __u8 l_i_frag; /* Fragment number */
317 __u8 l_i_fsize; /* Fragment size */
318 __le16 l_i_file_acl_high;
319 __le16 l_i_uid_high; /* these 2 fields */
320 __le16 l_i_gid_high; /* were reserved2[0] */
324 __u8 h_i_frag; /* Fragment number */
325 __u8 h_i_fsize; /* Fragment size */
332 __u8 m_i_frag; /* Fragment number */
333 __u8 m_i_fsize; /* Fragment size */
334 __le16 m_i_file_acl_high;
335 __u32 m_i_reserved2[2];
337 } osd2; /* OS dependent 2 */
338 __le16 i_extra_isize;
342 #define i_size_high i_dir_acl
344 #if defined(__KERNEL__) || defined(__linux__)
345 #define i_reserved1 osd1.linux1.l_i_reserved1
346 #define i_frag osd2.linux2.l_i_frag
347 #define i_fsize osd2.linux2.l_i_fsize
348 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
349 #define i_uid_low i_uid
350 #define i_gid_low i_gid
351 #define i_uid_high osd2.linux2.l_i_uid_high
352 #define i_gid_high osd2.linux2.l_i_gid_high
353 #define i_reserved2 osd2.linux2.l_i_reserved2
355 #elif defined(__GNU__)
357 #define i_translator osd1.hurd1.h_i_translator
358 #define i_frag osd2.hurd2.h_i_frag;
359 #define i_fsize osd2.hurd2.h_i_fsize;
360 #define i_uid_high osd2.hurd2.h_i_uid_high
361 #define i_gid_high osd2.hurd2.h_i_gid_high
362 #define i_author osd2.hurd2.h_i_author
364 #elif defined(__masix__)
366 #define i_reserved1 osd1.masix1.m_i_reserved1
367 #define i_frag osd2.masix2.m_i_frag
368 #define i_fsize osd2.masix2.m_i_fsize
369 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
370 #define i_reserved2 osd2.masix2.m_i_reserved2
372 #endif /* defined(__KERNEL__) || defined(__linux__) */
377 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
378 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
379 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
384 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
385 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
386 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
387 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
388 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
389 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
390 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
391 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
392 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
393 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
394 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
395 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
396 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
397 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
398 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
399 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
400 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
401 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
402 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
403 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
404 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
405 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
406 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
407 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
408 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
410 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
411 #ifndef _LINUX_EXT2_FS_H
412 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
413 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
414 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
417 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
418 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
419 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
422 #define ext4_set_bit ext2_set_bit
423 #define ext4_set_bit_atomic ext2_set_bit_atomic
424 #define ext4_clear_bit ext2_clear_bit
425 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
426 #define ext4_test_bit ext2_test_bit
427 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
428 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
431 * Maximal mount counts between two filesystem checks
433 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
434 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
437 * Behaviour when detecting errors
439 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
440 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
441 #define EXT4_ERRORS_PANIC 3 /* Panic */
442 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
445 * Structure of the super block
447 struct ext4_super_block {
448 /*00*/ __le32 s_inodes_count; /* Inodes count */
449 __le32 s_blocks_count; /* Blocks count */
450 __le32 s_r_blocks_count; /* Reserved blocks count */
451 __le32 s_free_blocks_count; /* Free blocks count */
452 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
453 __le32 s_first_data_block; /* First Data Block */
454 __le32 s_log_block_size; /* Block size */
455 __le32 s_log_frag_size; /* Fragment size */
456 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
457 __le32 s_frags_per_group; /* # Fragments per group */
458 __le32 s_inodes_per_group; /* # Inodes per group */
459 __le32 s_mtime; /* Mount time */
460 /*30*/ __le32 s_wtime; /* Write time */
461 __le16 s_mnt_count; /* Mount count */
462 __le16 s_max_mnt_count; /* Maximal mount count */
463 __le16 s_magic; /* Magic signature */
464 __le16 s_state; /* File system state */
465 __le16 s_errors; /* Behaviour when detecting errors */
466 __le16 s_minor_rev_level; /* minor revision level */
467 /*40*/ __le32 s_lastcheck; /* time of last check */
468 __le32 s_checkinterval; /* max. time between checks */
469 __le32 s_creator_os; /* OS */
470 __le32 s_rev_level; /* Revision level */
471 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
472 __le16 s_def_resgid; /* Default gid for reserved blocks */
474 * These fields are for EXT4_DYNAMIC_REV superblocks only.
476 * Note: the difference between the compatible feature set and
477 * the incompatible feature set is that if there is a bit set
478 * in the incompatible feature set that the kernel doesn't
479 * know about, it should refuse to mount the filesystem.
481 * e2fsck's requirements are more strict; if it doesn't know
482 * about a feature in either the compatible or incompatible
483 * feature set, it must abort and not try to meddle with
484 * things it doesn't understand...
486 __le32 s_first_ino; /* First non-reserved inode */
487 __le16 s_inode_size; /* size of inode structure */
488 __le16 s_block_group_nr; /* block group # of this superblock */
489 __le32 s_feature_compat; /* compatible feature set */
490 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
491 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
492 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
493 /*78*/ char s_volume_name[16]; /* volume name */
494 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
495 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
497 * Performance hints. Directory preallocation should only
498 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
500 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
501 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
502 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
504 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
506 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
507 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
508 __le32 s_journal_dev; /* device number of journal file */
509 __le32 s_last_orphan; /* start of list of inodes to delete */
510 __le32 s_hash_seed[4]; /* HTREE hash seed */
511 __u8 s_def_hash_version; /* Default hash version to use */
512 __u8 s_reserved_char_pad;
513 __le16 s_desc_size; /* size of group descriptor */
514 /*100*/ __le32 s_default_mount_opts;
515 __le32 s_first_meta_bg; /* First metablock block group */
516 __le32 s_mkfs_time; /* When the filesystem was created */
517 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
518 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
519 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
520 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
521 __le32 s_free_blocks_count_hi; /* Free blocks count */
522 __u16 s_min_extra_isize; /* All inodes have at least # bytes */
523 __u16 s_want_extra_isize; /* New inodes should reserve # bytes */
524 __u32 s_flags; /* Miscellaneous flags */
525 __u16 s_raid_stride; /* RAID stride */
526 __u16 s_mmp_interval; /* # seconds to wait in MMP checking */
527 __u64 s_mmp_block; /* Block for multi-mount protection */
528 __u32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
529 __u32 s_reserved[163]; /* Padding to the end of the block */
533 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
535 return sb->s_fs_info;
537 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
539 return container_of(inode, struct ext4_inode_info, vfs_inode);
542 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
544 return ino == EXT4_ROOT_INO ||
545 ino == EXT4_JOURNAL_INO ||
546 ino == EXT4_RESIZE_INO ||
547 (ino >= EXT4_FIRST_INO(sb) &&
548 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
551 /* Assume that user mode programs are passing in an ext4fs superblock, not
552 * a kernel struct super_block. This will allow us to call the feature-test
553 * macros from user land. */
554 #define EXT4_SB(sb) (sb)
557 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
560 * Codes for operating systems
562 #define EXT4_OS_LINUX 0
563 #define EXT4_OS_HURD 1
564 #define EXT4_OS_MASIX 2
565 #define EXT4_OS_FREEBSD 3
566 #define EXT4_OS_LITES 4
571 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
572 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
574 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
575 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
577 #define EXT4_GOOD_OLD_INODE_SIZE 128
580 * Feature set definitions
583 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
584 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
585 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
586 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
587 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
588 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
589 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
590 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
591 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
592 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
593 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
594 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
595 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
596 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
597 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
598 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
599 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
600 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
602 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
603 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
604 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
605 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
606 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
607 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
609 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
610 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
611 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
613 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
614 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
615 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
616 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
617 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
618 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
619 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
621 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
622 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
623 EXT4_FEATURE_INCOMPAT_RECOVER| \
624 EXT4_FEATURE_INCOMPAT_META_BG| \
625 EXT4_FEATURE_INCOMPAT_EXTENTS| \
626 EXT4_FEATURE_INCOMPAT_64BIT)
627 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
628 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
629 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
632 * Default values for user and/or group using reserved blocks
634 #define EXT4_DEF_RESUID 0
635 #define EXT4_DEF_RESGID 0
638 * Default mount options
640 #define EXT4_DEFM_DEBUG 0x0001
641 #define EXT4_DEFM_BSDGROUPS 0x0002
642 #define EXT4_DEFM_XATTR_USER 0x0004
643 #define EXT4_DEFM_ACL 0x0008
644 #define EXT4_DEFM_UID16 0x0010
645 #define EXT4_DEFM_JMODE 0x0060
646 #define EXT4_DEFM_JMODE_DATA 0x0020
647 #define EXT4_DEFM_JMODE_ORDERED 0x0040
648 #define EXT4_DEFM_JMODE_WBACK 0x0060
651 * Structure of a directory entry
653 #define EXT4_NAME_LEN 255
655 struct ext4_dir_entry {
656 __le32 inode; /* Inode number */
657 __le16 rec_len; /* Directory entry length */
658 __le16 name_len; /* Name length */
659 char name[EXT4_NAME_LEN]; /* File name */
663 * The new version of the directory entry. Since EXT4 structures are
664 * stored in intel byte order, and the name_len field could never be
665 * bigger than 255 chars, it's safe to reclaim the extra byte for the
668 struct ext4_dir_entry_2 {
669 __le32 inode; /* Inode number */
670 __le16 rec_len; /* Directory entry length */
671 __u8 name_len; /* Name length */
673 char name[EXT4_NAME_LEN]; /* File name */
677 * Ext4 directory file types. Only the low 3 bits are used. The
678 * other bits are reserved for now.
680 #define EXT4_FT_UNKNOWN 0
681 #define EXT4_FT_REG_FILE 1
682 #define EXT4_FT_DIR 2
683 #define EXT4_FT_CHRDEV 3
684 #define EXT4_FT_BLKDEV 4
685 #define EXT4_FT_FIFO 5
686 #define EXT4_FT_SOCK 6
687 #define EXT4_FT_SYMLINK 7
689 #define EXT4_FT_MAX 8
692 * EXT4_DIR_PAD defines the directory entries boundaries
694 * NOTE: It must be a multiple of 4
696 #define EXT4_DIR_PAD 4
697 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
698 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
701 * Hash Tree Directory indexing
702 * (c) Daniel Phillips, 2001
705 #ifdef CONFIG_EXT4_INDEX
706 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
707 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
708 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
709 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
710 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
713 #define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
714 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
717 /* Legal values for the dx_root hash_version field: */
719 #define DX_HASH_LEGACY 0
720 #define DX_HASH_HALF_MD4 1
721 #define DX_HASH_TEA 2
725 /* hash info structure used by the directory hash */
734 #define EXT4_HTREE_EOF 0x7fffffff
737 * Control parameters used by ext4_htree_next_block
739 #define HASH_NB_ALWAYS 1
743 * Describe an inode's exact location on disk and in memory
747 struct buffer_head *bh;
748 unsigned long offset;
749 unsigned long block_group;
752 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
754 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
758 * This structure is stuffed into the struct file's private_data field
759 * for directories. It is where we put information so that we can do
760 * readdir operations in hash tree order.
762 struct dir_private_info {
764 struct rb_node *curr_node;
765 struct fname *extra_fname;
768 __u32 curr_minor_hash;
772 /* calculate the first block number of the group */
773 static inline ext4_fsblk_t
774 ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
776 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
777 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
781 * Special error return code only used by dx_probe() and its callers.
783 #define ERR_BAD_DX_DIR -75000
785 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
786 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
789 * Function prototypes
793 * Ok, these declarations are also in <linux/kernel.h> but none of the
794 * ext4 source programs needs to include it so they are duplicated here.
796 # define NORET_TYPE /**/
797 # define ATTRIB_NORET __attribute__((noreturn))
798 # define NORET_AND noreturn,
801 extern unsigned int ext4_block_group(struct super_block *sb,
802 ext4_fsblk_t blocknr);
803 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
804 ext4_fsblk_t blocknr);
805 extern int ext4_bg_has_super(struct super_block *sb, int group);
806 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
807 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
808 ext4_fsblk_t goal, int *errp);
809 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
810 ext4_fsblk_t goal, unsigned long *count, int *errp);
811 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
812 ext4_fsblk_t block, unsigned long count);
813 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
814 ext4_fsblk_t block, unsigned long count,
815 unsigned long *pdquot_freed_blocks);
816 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
817 extern void ext4_check_blocks_bitmap (struct super_block *);
818 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
819 unsigned int block_group,
820 struct buffer_head ** bh);
821 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
822 extern void ext4_init_block_alloc_info(struct inode *);
823 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
826 extern int ext4_check_dir_entry(const char *, struct inode *,
827 struct ext4_dir_entry_2 *,
828 struct buffer_head *, unsigned long);
829 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
831 struct ext4_dir_entry_2 *dirent);
832 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
835 extern int ext4_sync_file (struct file *, struct dentry *, int);
838 extern int ext4fs_dirhash(const char *name, int len, struct
839 dx_hash_info *hinfo);
842 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
843 extern void ext4_free_inode (handle_t *, struct inode *);
844 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
845 extern unsigned long ext4_count_free_inodes (struct super_block *);
846 extern unsigned long ext4_count_dirs (struct super_block *);
847 extern void ext4_check_inodes_bitmap (struct super_block *);
848 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
852 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
853 struct buffer_head *bh, ext4_fsblk_t blocknr);
854 struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
855 struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
856 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
857 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
858 int create, int extend_disksize);
860 extern void ext4_read_inode (struct inode *);
861 extern int ext4_write_inode (struct inode *, int);
862 extern int ext4_setattr (struct dentry *, struct iattr *);
863 extern void ext4_delete_inode (struct inode *);
864 extern int ext4_sync_inode (handle_t *, struct inode *);
865 extern void ext4_discard_reservation (struct inode *);
866 extern void ext4_dirty_inode(struct inode *);
867 extern int ext4_change_inode_journal_flag(struct inode *, int);
868 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
869 extern void ext4_truncate (struct inode *);
870 extern void ext4_set_inode_flags(struct inode *);
871 extern void ext4_set_aops(struct inode *inode);
872 extern int ext4_writepage_trans_blocks(struct inode *);
873 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
874 struct address_space *mapping, loff_t from);
877 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
879 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
882 extern int ext4_orphan_add(handle_t *, struct inode *);
883 extern int ext4_orphan_del(handle_t *, struct inode *);
884 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
885 __u32 start_minor_hash, __u32 *next_hash);
888 extern int ext4_group_add(struct super_block *sb,
889 struct ext4_new_group_data *input);
890 extern int ext4_group_extend(struct super_block *sb,
891 struct ext4_super_block *es,
892 ext4_fsblk_t n_blocks_count);
895 extern void ext4_error (struct super_block *, const char *, const char *, ...)
896 __attribute__ ((format (printf, 3, 4)));
897 extern void __ext4_std_error (struct super_block *, const char *, int);
898 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
899 __attribute__ ((format (printf, 3, 4)));
900 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
901 __attribute__ ((format (printf, 3, 4)));
902 extern void ext4_update_dynamic_rev (struct super_block *sb);
903 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
904 struct ext4_group_desc *bg);
905 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
906 struct ext4_group_desc *bg);
907 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
908 struct ext4_group_desc *bg);
909 extern void ext4_block_bitmap_set(struct super_block *sb,
910 struct ext4_group_desc *bg, ext4_fsblk_t blk);
911 extern void ext4_inode_bitmap_set(struct super_block *sb,
912 struct ext4_group_desc *bg, ext4_fsblk_t blk);
913 extern void ext4_inode_table_set(struct super_block *sb,
914 struct ext4_group_desc *bg, ext4_fsblk_t blk);
916 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
918 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
919 le32_to_cpu(es->s_blocks_count);
922 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
924 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
925 le32_to_cpu(es->s_r_blocks_count);
928 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
930 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
931 le32_to_cpu(es->s_free_blocks_count);
934 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
937 es->s_blocks_count = cpu_to_le32((u32)blk);
938 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
941 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
944 es->s_free_blocks_count = cpu_to_le32((u32)blk);
945 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
948 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
951 es->s_r_blocks_count = cpu_to_le32((u32)blk);
952 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
957 #define ext4_std_error(sb, errno) \
960 __ext4_std_error((sb), __FUNCTION__, (errno)); \
964 * Inodes and files operations
968 extern const struct file_operations ext4_dir_operations;
971 extern const struct inode_operations ext4_file_inode_operations;
972 extern const struct file_operations ext4_file_operations;
975 extern const struct inode_operations ext4_dir_inode_operations;
976 extern const struct inode_operations ext4_special_inode_operations;
979 extern const struct inode_operations ext4_symlink_inode_operations;
980 extern const struct inode_operations ext4_fast_symlink_inode_operations;
983 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
984 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
985 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
987 unsigned long max_blocks, struct buffer_head *bh_result,
988 int create, int extend_disksize);
989 extern void ext4_ext_truncate(struct inode *, struct page *);
990 extern void ext4_ext_init(struct super_block *);
991 extern void ext4_ext_release(struct super_block *);
992 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
995 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
996 unsigned long max_blocks, struct buffer_head *bh,
997 int create, int extend_disksize)
999 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
1000 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
1001 bh, create, extend_disksize);
1002 return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
1003 create, extend_disksize);
1007 #endif /* __KERNEL__ */
1009 #endif /* _LINUX_EXT4_FS_H */