1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 1992, 1993, 1994, 1995
4 * Remy Card (card@masi.ibp.fr)
5 * Laboratoire MASI - Institut Blaise Pascal
6 * Universite Pierre et Marie Curie (Paris VI)
10 * linux/include/linux/minix_fs.h
12 * Copyright (C) 1991, 1992 Linus Torvalds
15 #include <linux/ext2_fs.h>
16 #include <linux/blockgroup_lock.h>
17 #include <linux/percpu_counter.h>
18 #include <linux/rbtree.h>
20 /* XXX Here for now... not interested in restructing headers JUST now */
22 /* data type for block offset of block group */
23 typedef int ext2_grpblk_t
;
25 /* data type for filesystem-wide blocks number */
26 typedef unsigned long ext2_fsblk_t
;
30 struct ext2_reserve_window
{
31 ext2_fsblk_t _rsv_start
; /* First byte reserved */
32 ext2_fsblk_t _rsv_end
; /* Last byte reserved or 0 */
35 struct ext2_reserve_window_node
{
36 struct rb_node rsv_node
;
39 struct ext2_reserve_window rsv_window
;
42 struct ext2_block_alloc_info
{
43 /* information about reservation window */
44 struct ext2_reserve_window_node rsv_window_node
;
46 * was i_next_alloc_block in ext2_inode_info
47 * is the logical (file-relative) number of the
48 * most-recently-allocated block in this file.
49 * We use this for detecting linearly ascending allocation requests.
51 __u32 last_alloc_logical_block
;
53 * Was i_next_alloc_goal in ext2_inode_info
54 * is the *physical* companion to i_next_alloc_block.
55 * it the the physical block number of the block which was most-recentl
56 * allocated to this file. This give us the goal (target) for the next
57 * allocation when we detect linearly ascending requests.
59 ext2_fsblk_t last_alloc_physical_block
;
62 #define rsv_start rsv_window._rsv_start
63 #define rsv_end rsv_window._rsv_end
68 * second extended-fs super-block data in memory
71 unsigned long s_frag_size
; /* Size of a fragment in bytes */
72 unsigned long s_frags_per_block
;/* Number of fragments per block */
73 unsigned long s_inodes_per_block
;/* Number of inodes per block */
74 unsigned long s_frags_per_group
;/* Number of fragments in a group */
75 unsigned long s_blocks_per_group
;/* Number of blocks in a group */
76 unsigned long s_inodes_per_group
;/* Number of inodes in a group */
77 unsigned long s_itb_per_group
; /* Number of inode table blocks per group */
78 unsigned long s_gdb_count
; /* Number of group descriptor blocks */
79 unsigned long s_desc_per_block
; /* Number of group descriptors per block */
80 unsigned long s_groups_count
; /* Number of groups in the fs */
81 unsigned long s_overhead_last
; /* Last calculated overhead */
82 unsigned long s_blocks_last
; /* Last seen block count */
83 struct buffer_head
* s_sbh
; /* Buffer containing the super block */
84 struct ext2_super_block
* s_es
; /* Pointer to the super block in the buffer */
85 struct buffer_head
** s_group_desc
;
86 unsigned long s_mount_opt
;
87 unsigned long s_sb_block
;
90 unsigned short s_mount_state
;
92 int s_addr_per_block_bits
;
93 int s_desc_per_block_bits
;
96 spinlock_t s_next_gen_lock
;
97 u32 s_next_generation
;
98 unsigned long s_dir_count
;
100 struct percpu_counter s_freeblocks_counter
;
101 struct percpu_counter s_freeinodes_counter
;
102 struct percpu_counter s_dirs_counter
;
103 struct blockgroup_lock
*s_blockgroup_lock
;
104 /* root of the per fs reservation window tree */
105 spinlock_t s_rsv_window_lock
;
106 struct rb_root s_rsv_window_root
;
107 struct ext2_reserve_window_node s_rsv_window_head
;
109 * s_lock protects against concurrent modifications of s_mount_state,
110 * s_blocks_last, s_overhead_last and the content of superblock's
111 * buffer pointed to by sbi->s_es.
113 * Note: It is used in ext2_show_options() to provide a consistent view
114 * of the mount options.
117 struct mb_cache
*s_ea_block_cache
;
118 struct dax_device
*s_daxdev
;
121 static inline spinlock_t
*
122 sb_bgl_lock(struct ext2_sb_info
*sbi
, unsigned int block_group
)
124 return bgl_lock_ptr(sbi
->s_blockgroup_lock
, block_group
);
128 * Define EXT2FS_DEBUG to produce debug messages
133 * Define EXT2_RESERVATION to reserve data blocks for expanding files
135 #define EXT2_DEFAULT_RESERVE_BLOCKS 8
136 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
137 #define EXT2_MAX_RESERVE_BLOCKS 1027
138 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
140 * The second extended file system version
142 #define EXT2FS_DATE "95/08/09"
143 #define EXT2FS_VERSION "0.5b"
149 # define ext2_debug(f, a...) { \
150 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
151 __FILE__, __LINE__, __func__); \
155 # define ext2_debug(f, a...) /**/
159 * Special inode numbers
161 #define EXT2_BAD_INO 1 /* Bad blocks inode */
162 #define EXT2_ROOT_INO 2 /* Root inode */
163 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
164 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
166 /* First non-reserved inode for old ext2 filesystems */
167 #define EXT2_GOOD_OLD_FIRST_INO 11
169 static inline struct ext2_sb_info
*EXT2_SB(struct super_block
*sb
)
171 return sb
->s_fs_info
;
175 * Macro-instructions used to manage several block sizes
177 #define EXT2_MIN_BLOCK_SIZE 1024
178 #define EXT2_MAX_BLOCK_SIZE 4096
179 #define EXT2_MIN_BLOCK_LOG_SIZE 10
180 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
181 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
182 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
183 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
184 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
185 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
188 * Macro-instructions used to manage fragments
190 #define EXT2_MIN_FRAG_SIZE 1024
191 #define EXT2_MAX_FRAG_SIZE 4096
192 #define EXT2_MIN_FRAG_LOG_SIZE 10
193 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
194 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
197 * Structure of a blocks group descriptor
199 struct ext2_group_desc
201 __le32 bg_block_bitmap
; /* Blocks bitmap block */
202 __le32 bg_inode_bitmap
; /* Inodes bitmap block */
203 __le32 bg_inode_table
; /* Inodes table block */
204 __le16 bg_free_blocks_count
; /* Free blocks count */
205 __le16 bg_free_inodes_count
; /* Free inodes count */
206 __le16 bg_used_dirs_count
; /* Directories count */
208 __le32 bg_reserved
[3];
212 * Macro-instructions used to manage group descriptors
214 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
215 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
216 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
217 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
220 * Constants relative to the data blocks
222 #define EXT2_NDIR_BLOCKS 12
223 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
224 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
225 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
226 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
229 * Inode flags (GETFLAGS/SETFLAGS)
231 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
232 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
233 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
234 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
235 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
236 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
237 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
238 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
239 /* Reserved for compression usage... */
240 #define EXT2_DIRTY_FL FS_DIRTY_FL
241 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
242 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
243 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
244 /* End compression flags --- maybe not all used */
245 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
246 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
247 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
248 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
249 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
250 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
251 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
252 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
254 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
255 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
257 /* Flags that should be inherited by new inodes from their parent. */
258 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
259 EXT2_SYNC_FL | EXT2_NODUMP_FL |\
260 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
261 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
262 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
264 /* Flags that are appropriate for regular files (all but dir-specific ones). */
265 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
267 /* Flags that are appropriate for non-directories/regular files. */
268 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
270 /* Mask out flags that are inappropriate for the given type of inode. */
271 static inline __u32
ext2_mask_flags(umode_t mode
, __u32 flags
)
275 else if (S_ISREG(mode
))
276 return flags
& EXT2_REG_FLMASK
;
278 return flags
& EXT2_OTHER_FLMASK
;
284 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
285 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
286 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
287 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
288 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
289 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
292 * ioctl commands in 32 bit emulation
294 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
295 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
296 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
297 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
300 * Structure of an inode on the disk
303 __le16 i_mode
; /* File mode */
304 __le16 i_uid
; /* Low 16 bits of Owner Uid */
305 __le32 i_size
; /* Size in bytes */
306 __le32 i_atime
; /* Access time */
307 __le32 i_ctime
; /* Creation time */
308 __le32 i_mtime
; /* Modification time */
309 __le32 i_dtime
; /* Deletion Time */
310 __le16 i_gid
; /* Low 16 bits of Group Id */
311 __le16 i_links_count
; /* Links count */
312 __le32 i_blocks
; /* Blocks count */
313 __le32 i_flags
; /* File flags */
316 __le32 l_i_reserved1
;
319 __le32 h_i_translator
;
322 __le32 m_i_reserved1
;
324 } osd1
; /* OS dependent 1 */
325 __le32 i_block
[EXT2_N_BLOCKS
];/* Pointers to blocks */
326 __le32 i_generation
; /* File version (for NFS) */
327 __le32 i_file_acl
; /* File ACL */
328 __le32 i_dir_acl
; /* Directory ACL */
329 __le32 i_faddr
; /* Fragment address */
332 __u8 l_i_frag
; /* Fragment number */
333 __u8 l_i_fsize
; /* Fragment size */
335 __le16 l_i_uid_high
; /* these 2 fields */
336 __le16 l_i_gid_high
; /* were reserved2[0] */
340 __u8 h_i_frag
; /* Fragment number */
341 __u8 h_i_fsize
; /* Fragment size */
342 __le16 h_i_mode_high
;
348 __u8 m_i_frag
; /* Fragment number */
349 __u8 m_i_fsize
; /* Fragment size */
351 __u32 m_i_reserved2
[2];
353 } osd2
; /* OS dependent 2 */
356 #define i_size_high i_dir_acl
358 #define i_reserved1 osd1.linux1.l_i_reserved1
359 #define i_frag osd2.linux2.l_i_frag
360 #define i_fsize osd2.linux2.l_i_fsize
361 #define i_uid_low i_uid
362 #define i_gid_low i_gid
363 #define i_uid_high osd2.linux2.l_i_uid_high
364 #define i_gid_high osd2.linux2.l_i_gid_high
365 #define i_reserved2 osd2.linux2.l_i_reserved2
370 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
371 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
372 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
377 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
378 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
379 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
380 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
381 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
382 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
383 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
384 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
385 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
386 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
387 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
388 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
389 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
390 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
391 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
392 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
393 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
396 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
397 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
398 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
401 * Maximal mount counts between two filesystem checks
403 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
404 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
407 * Behaviour when detecting errors
409 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
410 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
411 #define EXT2_ERRORS_PANIC 3 /* Panic */
412 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
415 * Structure of the super block
417 struct ext2_super_block
{
418 __le32 s_inodes_count
; /* Inodes count */
419 __le32 s_blocks_count
; /* Blocks count */
420 __le32 s_r_blocks_count
; /* Reserved blocks count */
421 __le32 s_free_blocks_count
; /* Free blocks count */
422 __le32 s_free_inodes_count
; /* Free inodes count */
423 __le32 s_first_data_block
; /* First Data Block */
424 __le32 s_log_block_size
; /* Block size */
425 __le32 s_log_frag_size
; /* Fragment size */
426 __le32 s_blocks_per_group
; /* # Blocks per group */
427 __le32 s_frags_per_group
; /* # Fragments per group */
428 __le32 s_inodes_per_group
; /* # Inodes per group */
429 __le32 s_mtime
; /* Mount time */
430 __le32 s_wtime
; /* Write time */
431 __le16 s_mnt_count
; /* Mount count */
432 __le16 s_max_mnt_count
; /* Maximal mount count */
433 __le16 s_magic
; /* Magic signature */
434 __le16 s_state
; /* File system state */
435 __le16 s_errors
; /* Behaviour when detecting errors */
436 __le16 s_minor_rev_level
; /* minor revision level */
437 __le32 s_lastcheck
; /* time of last check */
438 __le32 s_checkinterval
; /* max. time between checks */
439 __le32 s_creator_os
; /* OS */
440 __le32 s_rev_level
; /* Revision level */
441 __le16 s_def_resuid
; /* Default uid for reserved blocks */
442 __le16 s_def_resgid
; /* Default gid for reserved blocks */
444 * These fields are for EXT2_DYNAMIC_REV superblocks only.
446 * Note: the difference between the compatible feature set and
447 * the incompatible feature set is that if there is a bit set
448 * in the incompatible feature set that the kernel doesn't
449 * know about, it should refuse to mount the filesystem.
451 * e2fsck's requirements are more strict; if it doesn't know
452 * about a feature in either the compatible or incompatible
453 * feature set, it must abort and not try to meddle with
454 * things it doesn't understand...
456 __le32 s_first_ino
; /* First non-reserved inode */
457 __le16 s_inode_size
; /* size of inode structure */
458 __le16 s_block_group_nr
; /* block group # of this superblock */
459 __le32 s_feature_compat
; /* compatible feature set */
460 __le32 s_feature_incompat
; /* incompatible feature set */
461 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
462 __u8 s_uuid
[16]; /* 128-bit uuid for volume */
463 char s_volume_name
[16]; /* volume name */
464 char s_last_mounted
[64]; /* directory where last mounted */
465 __le32 s_algorithm_usage_bitmap
; /* For compression */
467 * Performance hints. Directory preallocation should only
468 * happen if the EXT2_COMPAT_PREALLOC flag is on.
470 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
471 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
474 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
476 __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
477 __u32 s_journal_inum
; /* inode number of journal file */
478 __u32 s_journal_dev
; /* device number of journal file */
479 __u32 s_last_orphan
; /* start of list of inodes to delete */
480 __u32 s_hash_seed
[4]; /* HTREE hash seed */
481 __u8 s_def_hash_version
; /* Default hash version to use */
482 __u8 s_reserved_char_pad
;
483 __u16 s_reserved_word_pad
;
484 __le32 s_default_mount_opts
;
485 __le32 s_first_meta_bg
; /* First metablock block group */
486 __u32 s_reserved
[190]; /* Padding to the end of the block */
490 * Codes for operating systems
492 #define EXT2_OS_LINUX 0
493 #define EXT2_OS_HURD 1
494 #define EXT2_OS_MASIX 2
495 #define EXT2_OS_FREEBSD 3
496 #define EXT2_OS_LITES 4
501 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
502 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
504 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
505 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
507 #define EXT2_GOOD_OLD_INODE_SIZE 128
510 * Feature set definitions
513 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
514 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
515 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
516 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
517 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
518 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
519 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
520 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
521 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
522 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
523 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
524 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
525 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
526 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
527 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
528 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
529 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
530 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
532 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
533 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
534 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
535 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
536 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
537 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
538 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
540 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
541 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
542 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
543 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
545 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
546 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
547 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
548 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
549 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
550 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
552 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
553 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
554 EXT2_FEATURE_INCOMPAT_META_BG)
555 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
556 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
557 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
558 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
559 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
562 * Default values for user and/or group using reserved blocks
564 #define EXT2_DEF_RESUID 0
565 #define EXT2_DEF_RESGID 0
568 * Default mount options
570 #define EXT2_DEFM_DEBUG 0x0001
571 #define EXT2_DEFM_BSDGROUPS 0x0002
572 #define EXT2_DEFM_XATTR_USER 0x0004
573 #define EXT2_DEFM_ACL 0x0008
574 #define EXT2_DEFM_UID16 0x0010
575 /* Not used by ext2, but reserved for use by ext3 */
576 #define EXT3_DEFM_JMODE 0x0060
577 #define EXT3_DEFM_JMODE_DATA 0x0020
578 #define EXT3_DEFM_JMODE_ORDERED 0x0040
579 #define EXT3_DEFM_JMODE_WBACK 0x0060
582 * Structure of a directory entry
585 struct ext2_dir_entry
{
586 __le32 inode
; /* Inode number */
587 __le16 rec_len
; /* Directory entry length */
588 __le16 name_len
; /* Name length */
589 char name
[]; /* File name, up to EXT2_NAME_LEN */
593 * The new version of the directory entry. Since EXT2 structures are
594 * stored in intel byte order, and the name_len field could never be
595 * bigger than 255 chars, it's safe to reclaim the extra byte for the
598 struct ext2_dir_entry_2
{
599 __le32 inode
; /* Inode number */
600 __le16 rec_len
; /* Directory entry length */
601 __u8 name_len
; /* Name length */
603 char name
[]; /* File name, up to EXT2_NAME_LEN */
607 * Ext2 directory file types. Only the low 3 bits are used. The
608 * other bits are reserved for now.
612 EXT2_FT_REG_FILE
= 1,
623 * EXT2_DIR_PAD defines the directory entries boundaries
625 * NOTE: It must be a multiple of 4
627 #define EXT2_DIR_PAD 4
628 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
629 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
631 #define EXT2_MAX_REC_LEN ((1<<16)-1)
633 static inline void verify_offsets(void)
635 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
636 A(EXT2_SB_MAGIC_OFFSET
, s_magic
);
637 A(EXT2_SB_BLOCKS_OFFSET
, s_blocks_count
);
638 A(EXT2_SB_BSIZE_OFFSET
, s_log_block_size
);
645 struct ext2_mount_options
{
646 unsigned long s_mount_opt
;
652 * second extended file system inode data in memory
654 struct ext2_inode_info
{
666 * i_block_group is the number of the block group which contains
667 * this file's inode. Constant across the lifetime of the inode,
668 * it is used for making block allocation decisions - we try to
669 * place a file's data blocks near its inode block, and new inodes
670 * near to their parent directory's inode.
674 /* block reservation info */
675 struct ext2_block_alloc_info
*i_block_alloc_info
;
677 __u32 i_dir_start_lookup
;
678 #ifdef CONFIG_EXT2_FS_XATTR
680 * Extended attributes can be read independently of the main file
681 * data. Taking i_mutex even when reading would cause contention
682 * between readers of EAs and writers of regular file data, so
683 * instead we synchronize on xattr_sem when reading or changing
686 struct rw_semaphore xattr_sem
;
688 rwlock_t i_meta_lock
;
690 struct rw_semaphore dax_sem
;
694 * truncate_mutex is for serialising ext2_truncate() against
695 * ext2_getblock(). It also protects the internals of the inode's
696 * reservation data structures: ext2_reserve_window and
697 * ext2_reserve_window_node.
699 struct mutex truncate_mutex
;
700 struct inode vfs_inode
;
701 struct list_head i_orphan
; /* unlinked but open inodes */
703 struct dquot
*i_dquot
[MAXQUOTAS
];
708 #define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem)
709 #define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem)
711 #define dax_sem_down_write(ext2_inode)
712 #define dax_sem_up_write(ext2_inode)
716 * Inode dynamic state flags
718 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
722 * Function prototypes
726 * Ok, these declarations are also in <linux/kernel.h> but none of the
727 * ext2 source programs needs to include it so they are duplicated here.
730 static inline struct ext2_inode_info
*EXT2_I(struct inode
*inode
)
732 return container_of(inode
, struct ext2_inode_info
, vfs_inode
);
736 extern int ext2_bg_has_super(struct super_block
*sb
, int group
);
737 extern unsigned long ext2_bg_num_gdb(struct super_block
*sb
, int group
);
738 extern ext2_fsblk_t
ext2_new_block(struct inode
*, unsigned long, int *);
739 extern ext2_fsblk_t
ext2_new_blocks(struct inode
*, unsigned long,
740 unsigned long *, int *);
741 extern int ext2_data_block_valid(struct ext2_sb_info
*sbi
, ext2_fsblk_t start_blk
,
743 extern void ext2_free_blocks (struct inode
*, unsigned long,
745 extern unsigned long ext2_count_free_blocks (struct super_block
*);
746 extern unsigned long ext2_count_dirs (struct super_block
*);
747 extern struct ext2_group_desc
* ext2_get_group_desc(struct super_block
* sb
,
748 unsigned int block_group
,
749 struct buffer_head
** bh
);
750 extern void ext2_discard_reservation (struct inode
*);
751 extern int ext2_should_retry_alloc(struct super_block
*sb
, int *retries
);
752 extern void ext2_init_block_alloc_info(struct inode
*);
753 extern void ext2_rsv_window_add(struct super_block
*sb
, struct ext2_reserve_window_node
*rsv
);
756 extern int ext2_add_link (struct dentry
*, struct inode
*);
757 extern ino_t
ext2_inode_by_name(struct inode
*, const struct qstr
*);
758 extern int ext2_make_empty(struct inode
*, struct inode
*);
759 extern struct ext2_dir_entry_2
* ext2_find_entry (struct inode
*,const struct qstr
*, struct page
**);
760 extern int ext2_delete_entry (struct ext2_dir_entry_2
*, struct page
*);
761 extern int ext2_empty_dir (struct inode
*);
762 extern struct ext2_dir_entry_2
* ext2_dotdot (struct inode
*, struct page
**);
763 extern void ext2_set_link(struct inode
*, struct ext2_dir_entry_2
*, struct page
*, struct inode
*, int);
766 extern struct inode
* ext2_new_inode (struct inode
*, umode_t
, const struct qstr
*);
767 extern void ext2_free_inode (struct inode
*);
768 extern unsigned long ext2_count_free_inodes (struct super_block
*);
769 extern unsigned long ext2_count_free (struct buffer_head
*, unsigned);
772 extern struct inode
*ext2_iget (struct super_block
*, unsigned long);
773 extern int ext2_write_inode (struct inode
*, struct writeback_control
*);
774 extern void ext2_evict_inode(struct inode
*);
775 extern int ext2_get_block(struct inode
*, sector_t
, struct buffer_head
*, int);
776 extern int ext2_setattr (struct dentry
*, struct iattr
*);
777 extern void ext2_set_inode_flags(struct inode
*inode
);
778 extern int ext2_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
782 extern long ext2_ioctl(struct file
*, unsigned int, unsigned long);
783 extern long ext2_compat_ioctl(struct file
*, unsigned int, unsigned long);
786 struct dentry
*ext2_get_parent(struct dentry
*child
);
789 extern __printf(3, 4)
790 void ext2_error(struct super_block
*, const char *, const char *, ...);
791 extern __printf(3, 4)
792 void ext2_msg(struct super_block
*, const char *, const char *, ...);
793 extern void ext2_update_dynamic_rev (struct super_block
*sb
);
794 extern void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
798 * Inodes and files operations
802 extern const struct file_operations ext2_dir_operations
;
805 extern int ext2_fsync(struct file
*file
, loff_t start
, loff_t end
,
807 extern const struct inode_operations ext2_file_inode_operations
;
808 extern const struct file_operations ext2_file_operations
;
811 extern void ext2_set_file_ops(struct inode
*inode
);
812 extern const struct address_space_operations ext2_aops
;
813 extern const struct address_space_operations ext2_nobh_aops
;
814 extern const struct iomap_ops ext2_iomap_ops
;
817 extern const struct inode_operations ext2_dir_inode_operations
;
818 extern const struct inode_operations ext2_special_inode_operations
;
821 extern const struct inode_operations ext2_fast_symlink_inode_operations
;
822 extern const struct inode_operations ext2_symlink_inode_operations
;
824 static inline ext2_fsblk_t
825 ext2_group_first_block_no(struct super_block
*sb
, unsigned long group_no
)
827 return group_no
* (ext2_fsblk_t
)EXT2_BLOCKS_PER_GROUP(sb
) +
828 le32_to_cpu(EXT2_SB(sb
)->s_es
->s_first_data_block
);
831 #define ext2_set_bit __test_and_set_bit_le
832 #define ext2_clear_bit __test_and_clear_bit_le
833 #define ext2_test_bit test_bit_le
834 #define ext2_find_first_zero_bit find_first_zero_bit_le
835 #define ext2_find_next_zero_bit find_next_zero_bit_le