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[linux-2.6-block.git] / fs / ext2 / ext2.h
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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
f7699f2b
AV		 2/*
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)
7 *
8 * from
9 *
10 * linux/include/linux/minix_fs.h
11 *
12 * Copyright (C) 1991, 1992 Linus Torvalds
13 */
1da177e4
LT		 14#include <linux/fs.h>
15#include <linux/ext2_fs.h>
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AV		 16#include <linux/blockgroup_lock.h>
17#include <linux/percpu_counter.h>
18#include <linux/rbtree.h>
19
20/* XXX Here for now... not interested in restructing headers JUST now */
21
22/* data type for block offset of block group */
23typedef int ext2_grpblk_t;
24
25/* data type for filesystem-wide blocks number */
26typedef unsigned long ext2_fsblk_t;
27
28#define E2FSBLK "%lu"
29
30struct ext2_reserve_window {
31 ext2_fsblk_t _rsv_start; /* First byte reserved */
32 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */
33};
34
35struct ext2_reserve_window_node {
36 struct rb_node rsv_node;
37 __u32 rsv_goal_size;
38 __u32 rsv_alloc_hit;
39 struct ext2_reserve_window rsv_window;
40};
41
42struct ext2_block_alloc_info {
43 /* information about reservation window */
44 struct ext2_reserve_window_node rsv_window_node;
45 /*
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.
50 */
51 __u32 last_alloc_logical_block;
52 /*
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.
58 */
59 ext2_fsblk_t last_alloc_physical_block;
60};
61
62#define rsv_start rsv_window._rsv_start
63#define rsv_end rsv_window._rsv_end
64
7a2508e1 65struct mb_cache;
be0726d3 66
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AV		 67/*
68 * second extended-fs super-block data in memory
69 */
70struct ext2_sb_info {
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;
b8a9f9e1
EB		 88 kuid_t s_resuid;
89 kgid_t s_resgid;
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AV		 90 unsigned short s_mount_state;
91 unsigned short s_pad;
92 int s_addr_per_block_bits;
93 int s_desc_per_block_bits;
94 int s_inode_size;
95 int s_first_ino;
96 spinlock_t s_next_gen_lock;
97 u32 s_next_generation;
98 unsigned long s_dir_count;
99 u8 *s_debts;
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;
108 /*
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.
112 *
113 * Note: It is used in ext2_show_options() to provide a consistent view
114 * of the mount options.
115 */
116 spinlock_t s_lock;
47387409 117 struct mb_cache *s_ea_block_cache;
8cf037a8 118 struct dax_device *s_daxdev;
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AV		 119};
120
121static inline spinlock_t *
122sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
123{
124 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
125}
126
127/*
128 * Define EXT2FS_DEBUG to produce debug messages
129 */
130#undef EXT2FS_DEBUG
131
132/*
133 * Define EXT2_RESERVATION to reserve data blocks for expanding files
134 */
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
139/*
140 * The second extended file system version
141 */
142#define EXT2FS_DATE "95/08/09"
143#define EXT2FS_VERSION "0.5b"
144
145/*
146 * Debug code
147 */
148#ifdef EXT2FS_DEBUG
149# define ext2_debug(f, a...) { \
150 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
151 __FILE__, __LINE__, __func__); \
152 printk (f, ## a); \
153 }
154#else
155# define ext2_debug(f, a...) /**/
156#endif
157
158/*
159 * Special inode numbers
160 */
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 */
165
166/* First non-reserved inode for old ext2 filesystems */
167#define EXT2_GOOD_OLD_FIRST_INO 11
168
169static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
170{
171 return sb->s_fs_info;
172}
173
174/*
175 * Macro-instructions used to manage several block sizes
176 */
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)
186
187/*
188 * Macro-instructions used to manage fragments
189 */
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)
195
196/*
197 * Structure of a blocks group descriptor
198 */
199struct ext2_group_desc
200{
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 */
207 __le16 bg_pad;
208 __le32 bg_reserved[3];
209};
210
211/*
212 * Macro-instructions used to manage group descriptors
213 */
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)
218
219/*
220 * Constants relative to the data blocks
221 */
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)
227
228/*
229 * Inode flags (GETFLAGS/SETFLAGS)
230 */
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 */
253
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 */
256
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)
263
264/* Flags that are appropriate for regular files (all but dir-specific ones). */
265#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
266
267/* Flags that are appropriate for non-directories/regular files. */
268#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
269
270/* Mask out flags that are inappropriate for the given type of inode. */
271static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
272{
273 if (S_ISDIR(mode))
274 return flags;
275 else if (S_ISREG(mode))
276 return flags & EXT2_REG_FLMASK;
277 else
278 return flags & EXT2_OTHER_FLMASK;
279}
280
281/*
282 * ioctl commands
283 */
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)
290
291/*
292 * ioctl commands in 32 bit emulation
293 */
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
298
299/*
300 * Structure of an inode on the disk
301 */
302struct ext2_inode {
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 */
314 union {
315 struct {
316 __le32 l_i_reserved1;
317 } linux1;
318 struct {
319 __le32 h_i_translator;
320 } hurd1;
321 struct {
322 __le32 m_i_reserved1;
323 } masix1;
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 */
330 union {
331 struct {
332 __u8 l_i_frag; /* Fragment number */
333 __u8 l_i_fsize; /* Fragment size */
334 __u16 i_pad1;
335 __le16 l_i_uid_high; /* these 2 fields */
336 __le16 l_i_gid_high; /* were reserved2[0] */
337 __u32 l_i_reserved2;
338 } linux2;
339 struct {
340 __u8 h_i_frag; /* Fragment number */
341 __u8 h_i_fsize; /* Fragment size */
342 __le16 h_i_mode_high;
343 __le16 h_i_uid_high;
344 __le16 h_i_gid_high;
345 __le32 h_i_author;
346 } hurd2;
347 struct {
348 __u8 m_i_frag; /* Fragment number */
349 __u8 m_i_fsize; /* Fragment size */
350 __u16 m_pad1;
351 __u32 m_i_reserved2[2];
352 } masix2;
353 } osd2; /* OS dependent 2 */
354};
355
356#define i_size_high i_dir_acl
357
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
366
367/*
368 * File system states
369 */
370#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
371#define EXT2_ERROR_FS 0x0002 /* Errors detected */
ff0031d8 372#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
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AV		 373
374/*
375 * Mount flags
376 */
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 */
9c3ce9ec 389#define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
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AV		 390#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
391#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
392#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
9c3ce9ec 393#define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
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AV		 394
395
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 & \
399 EXT2_MOUNT_##opt)
400/*
401 * Maximal mount counts between two filesystem checks
402 */
403#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
404#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
405
406/*
407 * Behaviour when detecting errors
408 */
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
413
414/*
415 * Structure of the super block
416 */
417struct 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 */
443 /*
444 * These fields are for EXT2_DYNAMIC_REV superblocks only.
445 *
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.
450 *
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...
455 */
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 */
466 /*
467 * Performance hints. Directory preallocation should only
468 * happen if the EXT2_COMPAT_PREALLOC flag is on.
469 */
470 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
471 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
472 __u16 s_padding1;
473 /*
474 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
475 */
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 */
487};
488
489/*
490 * Codes for operating systems
491 */
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
497
498/*
499 * Revision levels
500 */
501#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
502#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
503
504#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
505#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
506
507#define EXT2_GOOD_OLD_INODE_SIZE 128
508
509/*
510 * Feature set definitions
511 */
512
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)
531
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
539
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
544
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
551
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
560
561/*
562 * Default values for user and/or group using reserved blocks
563 */
564#define EXT2_DEF_RESUID 0
565#define EXT2_DEF_RESGID 0
566
567/*
568 * Default mount options
569 */
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
580
581/*
582 * Structure of a directory entry
583 */
584
585struct 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 */
590};
591
592/*
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
596 * file_type field.
597 */
598struct ext2_dir_entry_2 {
599 __le32 inode; /* Inode number */
600 __le16 rec_len; /* Directory entry length */
601 __u8 name_len; /* Name length */
602 __u8 file_type;
603 char name[]; /* File name, up to EXT2_NAME_LEN */
604};
605
606/*
607 * Ext2 directory file types. Only the low 3 bits are used. The
608 * other bits are reserved for now.
609 */
610enum {
611 EXT2_FT_UNKNOWN = 0,
612 EXT2_FT_REG_FILE = 1,
613 EXT2_FT_DIR = 2,
614 EXT2_FT_CHRDEV = 3,
615 EXT2_FT_BLKDEV = 4,
616 EXT2_FT_FIFO = 5,
617 EXT2_FT_SOCK = 6,
618 EXT2_FT_SYMLINK = 7,
619 EXT2_FT_MAX
620};
621
622/*
623 * EXT2_DIR_PAD defines the directory entries boundaries
624 *
625 * NOTE: It must be a multiple of 4
626 */
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) & \
630 ~EXT2_DIR_ROUND)
631#define EXT2_MAX_REC_LEN ((1<<16)-1)
632
633static inline void verify_offsets(void)
634{
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);
639#undef A
640}
1da177e4 641
50a52234
JK		 642/*
643 * ext2 mount options
644 */
645struct ext2_mount_options {
646 unsigned long s_mount_opt;
b8a9f9e1
EB		 647 kuid_t s_resuid;
648 kgid_t s_resgid;
50a52234
JK		 649};
650
1da177e4
LT		 651/*
652 * second extended file system inode data in memory
653 */
654struct ext2_inode_info {
655 __le32 i_data[15];
656 __u32 i_flags;
657 __u32 i_faddr;
658 __u8 i_frag_no;
659 __u8 i_frag_size;
660 __u16 i_state;
661 __u32 i_file_acl;
662 __u32 i_dir_acl;
663 __u32 i_dtime;
664
665 /*
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,
88164ff4 668 * it is used for making block allocation decisions - we try to
1da177e4
LT		 669 * place a file's data blocks near its inode block, and new inodes
670 * near to their parent directory's inode.
671 */
672 __u32 i_block_group;
673
a686cd89
MB		 674 /* block reservation info */
675 struct ext2_block_alloc_info *i_block_alloc_info;
1da177e4 676
1da177e4
LT		 677 __u32 i_dir_start_lookup;
678#ifdef CONFIG_EXT2_FS_XATTR
679 /*
680 * Extended attributes can be read independently of the main file
1b1dcc1b 681 * data. Taking i_mutex even when reading would cause contention
1da177e4
LT		 682 * between readers of EAs and writers of regular file data, so
683 * instead we synchronize on xattr_sem when reading or changing
684 * EAs.
685 */
686 struct rw_semaphore xattr_sem;
1da177e4
LT		 687#endif
688 rwlock_t i_meta_lock;
5726b27b
RZ		 689#ifdef CONFIG_FS_DAX
690 struct rw_semaphore dax_sem;
691#endif
a686cd89
MB		 692
693 /*
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.
698 */
699 struct mutex truncate_mutex;
1da177e4 700 struct inode vfs_inode;
a686cd89 701 struct list_head i_orphan; /* unlinked but open inodes */
64241118
JK		 702#ifdef CONFIG_QUOTA
703 struct dquot *i_dquot[MAXQUOTAS];
704#endif
1da177e4
LT		 705};
706
5726b27b
RZ		 707#ifdef CONFIG_FS_DAX
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)
710#else
711#define dax_sem_down_write(ext2_inode)
712#define dax_sem_up_write(ext2_inode)
713#endif
714
1da177e4
LT		 715/*
716 * Inode dynamic state flags
717 */
718#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
719
720
721/*
722 * Function prototypes
723 */
724
725/*
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.
728 */
729
730static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
731{
732 return container_of(inode, struct ext2_inode_info, vfs_inode);
733}
734
735/* balloc.c */
736extern int ext2_bg_has_super(struct super_block *sb, int group);
737extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
a686cd89
MB		 738extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
739extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
740 unsigned long *, int *);
ff0031d8
CM		 741extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
742 unsigned int count);
1da177e4
LT		 743extern void ext2_free_blocks (struct inode *, unsigned long,
744 unsigned long);
745extern unsigned long ext2_count_free_blocks (struct super_block *);
746extern unsigned long ext2_count_dirs (struct super_block *);
1da177e4
LT		 747extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
748 unsigned int block_group,
749 struct buffer_head ** bh);
a686cd89
MB		 750extern void ext2_discard_reservation (struct inode *);
751extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
752extern void ext2_init_block_alloc_info(struct inode *);
753extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
1da177e4
LT		 754
755/* dir.c */
756extern int ext2_add_link (struct dentry *, struct inode *);
ac3ba644 757extern ino_t ext2_inode_by_name(struct inode *, const struct qstr *);
1da177e4 758extern int ext2_make_empty(struct inode *, struct inode *);
ac3ba644 759extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **);
1da177e4
LT		 760extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
761extern int ext2_empty_dir (struct inode *);
762extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
39fe7557 763extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int);
1da177e4 764
1da177e4 765/* ialloc.c */
3ea40bc9 766extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);
1da177e4
LT		 767extern void ext2_free_inode (struct inode *);
768extern unsigned long ext2_count_free_inodes (struct super_block *);
1da177e4
LT		 769extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
770
771/* inode.c */
52fcf703 772extern struct inode *ext2_iget (struct super_block *, unsigned long);
a9185b41 773extern int ext2_write_inode (struct inode *, struct writeback_control *);
72edc4d0 774extern void ext2_evict_inode(struct inode *);
1da177e4 775extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
1da177e4
LT		 776extern int ext2_setattr (struct dentry *, struct iattr *);
777extern void ext2_set_inode_flags(struct inode *inode);
68c9d702
JB		 778extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
779 u64 start, u64 len);
1da177e4
LT		 780
781/* ioctl.c */
14f9f7b2 782extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
e322ff07 783extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
1da177e4 784
2c221290
AB		 785/* namei.c */
786struct dentry *ext2_get_parent(struct dentry *child);
787
1da177e4 788/* super.c */
b9075fa9
JP		 789extern __printf(3, 4)
790void ext2_error(struct super_block *, const char *, const char *, ...);
791extern __printf(3, 4)
792void ext2_msg(struct super_block *, const char *, const char *, ...);
1da177e4 793extern void ext2_update_dynamic_rev (struct super_block *sb);
65547661
JK		 794extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
795 int wait);
1da177e4
LT		 796
797/*
798 * Inodes and files operations
799 */
800
801/* dir.c */
4b6f5d20 802extern const struct file_operations ext2_dir_operations;
1da177e4
LT		 803
804/* file.c */
02c24a82
JB		 805extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
806 int datasync);
754661f1 807extern const struct inode_operations ext2_file_inode_operations;
4b6f5d20 808extern const struct file_operations ext2_file_operations;
1da177e4
LT		 809
810/* inode.c */
fb094c90 811extern void ext2_set_file_ops(struct inode *inode);
f5e54d6e 812extern const struct address_space_operations ext2_aops;
f5e54d6e 813extern const struct address_space_operations ext2_nobh_aops;
8ff6daa1 814extern const struct iomap_ops ext2_iomap_ops;
1da177e4
LT		 815
816/* namei.c */
754661f1
AV		 817extern const struct inode_operations ext2_dir_inode_operations;
818extern const struct inode_operations ext2_special_inode_operations;
1da177e4
LT		 819
820/* symlink.c */
754661f1
AV		 821extern const struct inode_operations ext2_fast_symlink_inode_operations;
822extern const struct inode_operations ext2_symlink_inode_operations;
6454d1f9
TP		 823
824static inline ext2_fsblk_t
825ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
826{
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);
829}
f312eff8
AM		 830
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
Linux 6.x block layer and io_uring tree(s)