1 /*
2 * Copyright (C) 1992, 1993, 1994, 1995
3 * Remy Card (card@masi.ibp.fr)
4 * Laboratoire MASI - Institut Blaise Pascal
5 * Universite Pierre et Marie Curie (Paris VI)
6 *
7 * from
8 *
9 * linux/include/linux/minix_fs.h
10 *
11 * Copyright (C) 1991, 1992 Linus Torvalds
12 */
13 #include <linux/fs.h>
14 #include <linux/ext2_fs.h>
15 #include <linux/blockgroup_lock.h>
16 #include <linux/percpu_counter.h>
17 #include <linux/rbtree.h>
18
19 /* XXX Here for now... not interested in restructing headers JUST now */
20
21 /* data type for block offset of block group */
22 typedef int ext2_grpblk_t;
23
24 /* data type for filesystem-wide blocks number */
25 typedef unsigned long ext2_fsblk_t;
26
27 #define E2FSBLK "%lu"
28
29 struct ext2_reserve_window {
30 ext2_fsblk_t _rsv_start; /* First byte reserved */
31 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */
32 };
33
34 struct ext2_reserve_window_node {
35 struct rb_node rsv_node;
36 __u32 rsv_goal_size;
37 __u32 rsv_alloc_hit;
38 struct ext2_reserve_window rsv_window;
39 };
40
41 struct ext2_block_alloc_info {
42 /* information about reservation window */
43 struct ext2_reserve_window_node rsv_window_node;
44 /*
45 * was i_next_alloc_block in ext2_inode_info
46 * is the logical (file-relative) number of the
47 * most-recently-allocated block in this file.
48 * We use this for detecting linearly ascending allocation requests.
49 */
50 __u32 last_alloc_logical_block;
51 /*
52 * Was i_next_alloc_goal in ext2_inode_info
53 * is the *physical* companion to i_next_alloc_block.
54 * it the the physical block number of the block which was most-recentl
55 * allocated to this file. This give us the goal (target) for the next
56 * allocation when we detect linearly ascending requests.
57 */
58 ext2_fsblk_t last_alloc_physical_block;
59 };
60
61 #define rsv_start rsv_window._rsv_start
62 #define rsv_end rsv_window._rsv_end
63
64 struct mb_cache;
65
66 /*
67 * second extended-fs super-block data in memory
68 */
69 struct ext2_sb_info {
70 unsigned long s_frag_size; /* Size of a fragment in bytes */
71 unsigned long s_frags_per_block;/* Number of fragments per block */
72 unsigned long s_inodes_per_block;/* Number of inodes per block */
73 unsigned long s_frags_per_group;/* Number of fragments in a group */
74 unsigned long s_blocks_per_group;/* Number of blocks in a group */
75 unsigned long s_inodes_per_group;/* Number of inodes in a group */
76 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
77 unsigned long s_gdb_count; /* Number of group descriptor blocks */
78 unsigned long s_desc_per_block; /* Number of group descriptors per block */
79 unsigned long s_groups_count; /* Number of groups in the fs */
80 unsigned long s_overhead_last; /* Last calculated overhead */
81 unsigned long s_blocks_last; /* Last seen block count */
82 struct buffer_head * s_sbh; /* Buffer containing the super block */
83 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
84 struct buffer_head ** s_group_desc;
85 unsigned long s_mount_opt;
86 unsigned long s_sb_block;
87 kuid_t s_resuid;
88 kgid_t s_resgid;
89 unsigned short s_mount_state;
90 unsigned short s_pad;
91 int s_addr_per_block_bits;
92 int s_desc_per_block_bits;
93 int s_inode_size;
94 int s_first_ino;
95 spinlock_t s_next_gen_lock;
96 u32 s_next_generation;
97 unsigned long s_dir_count;
98 u8 *s_debts;
99 struct percpu_counter s_freeblocks_counter;
100 struct percpu_counter s_freeinodes_counter;
101 struct percpu_counter s_dirs_counter;
102 struct blockgroup_lock *s_blockgroup_lock;
103 /* root of the per fs reservation window tree */
104 spinlock_t s_rsv_window_lock;
105 struct rb_root s_rsv_window_root;
106 struct ext2_reserve_window_node s_rsv_window_head;
107 /*
108 * s_lock protects against concurrent modifications of s_mount_state,
109 * s_blocks_last, s_overhead_last and the content of superblock's
110 * buffer pointed to by sbi->s_es.
111 *
112 * Note: It is used in ext2_show_options() to provide a consistent view
113 * of the mount options.
114 */
115 spinlock_t s_lock;
116 struct mb_cache *s_mb_cache;
117 };
118
119 static inline spinlock_t *
sb_bgl_lock(struct ext2_sb_info * sbi,unsigned int block_group)120 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
121 {
122 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
123 }
124
125 /*
126 * Define EXT2FS_DEBUG to produce debug messages
127 */
128 #undef EXT2FS_DEBUG
129
130 /*
131 * Define EXT2_RESERVATION to reserve data blocks for expanding files
132 */
133 #define EXT2_DEFAULT_RESERVE_BLOCKS 8
134 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
135 #define EXT2_MAX_RESERVE_BLOCKS 1027
136 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
137 /*
138 * The second extended file system version
139 */
140 #define EXT2FS_DATE "95/08/09"
141 #define EXT2FS_VERSION "0.5b"
142
143 /*
144 * Debug code
145 */
146 #ifdef EXT2FS_DEBUG
147 # define ext2_debug(f, a...) { \
148 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
149 __FILE__, __LINE__, __func__); \
150 printk (f, ## a); \
151 }
152 #else
153 # define ext2_debug(f, a...) /**/
154 #endif
155
156 /*
157 * Special inode numbers
158 */
159 #define EXT2_BAD_INO 1 /* Bad blocks inode */
160 #define EXT2_ROOT_INO 2 /* Root inode */
161 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
162 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
163
164 /* First non-reserved inode for old ext2 filesystems */
165 #define EXT2_GOOD_OLD_FIRST_INO 11
166
EXT2_SB(struct super_block * sb)167 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
168 {
169 return sb->s_fs_info;
170 }
171
172 /*
173 * Macro-instructions used to manage several block sizes
174 */
175 #define EXT2_MIN_BLOCK_SIZE 1024
176 #define EXT2_MAX_BLOCK_SIZE 4096
177 #define EXT2_MIN_BLOCK_LOG_SIZE 10
178 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
179 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
180 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
181 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
182 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
183 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
184
185 /*
186 * Macro-instructions used to manage fragments
187 */
188 #define EXT2_MIN_FRAG_SIZE 1024
189 #define EXT2_MAX_FRAG_SIZE 4096
190 #define EXT2_MIN_FRAG_LOG_SIZE 10
191 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
192 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
193
194 /*
195 * Structure of a blocks group descriptor
196 */
197 struct ext2_group_desc
198 {
199 __le32 bg_block_bitmap; /* Blocks bitmap block */
200 __le32 bg_inode_bitmap; /* Inodes bitmap block */
201 __le32 bg_inode_table; /* Inodes table block */
202 __le16 bg_free_blocks_count; /* Free blocks count */
203 __le16 bg_free_inodes_count; /* Free inodes count */
204 __le16 bg_used_dirs_count; /* Directories count */
205 __le16 bg_pad;
206 __le32 bg_reserved[3];
207 };
208
209 /*
210 * Macro-instructions used to manage group descriptors
211 */
212 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
213 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
214 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
215 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
216
217 /*
218 * Constants relative to the data blocks
219 */
220 #define EXT2_NDIR_BLOCKS 12
221 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
222 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
223 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
224 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
225
226 /*
227 * Inode flags (GETFLAGS/SETFLAGS)
228 */
229 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
230 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
231 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
232 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
233 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
234 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
235 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
236 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
237 /* Reserved for compression usage... */
238 #define EXT2_DIRTY_FL FS_DIRTY_FL
239 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
240 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
241 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
242 /* End compression flags --- maybe not all used */
243 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
244 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
245 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
246 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
247 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
248 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
249 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
250 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
251
252 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
253 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
254
255 /* Flags that should be inherited by new inodes from their parent. */
256 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
257 EXT2_SYNC_FL | EXT2_NODUMP_FL |\
258 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
259 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
260 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
261
262 /* Flags that are appropriate for regular files (all but dir-specific ones). */
263 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
264
265 /* Flags that are appropriate for non-directories/regular files. */
266 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
267
268 /* Mask out flags that are inappropriate for the given type of inode. */
ext2_mask_flags(umode_t mode,__u32 flags)269 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
270 {
271 if (S_ISDIR(mode))
272 return flags;
273 else if (S_ISREG(mode))
274 return flags & EXT2_REG_FLMASK;
275 else
276 return flags & EXT2_OTHER_FLMASK;
277 }
278
279 /*
280 * ioctl commands
281 */
282 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
283 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
284 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
285 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
286 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
287 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
288
289 /*
290 * ioctl commands in 32 bit emulation
291 */
292 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
293 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
294 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
295 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
296
297 /*
298 * Structure of an inode on the disk
299 */
300 struct ext2_inode {
301 __le16 i_mode; /* File mode */
302 __le16 i_uid; /* Low 16 bits of Owner Uid */
303 __le32 i_size; /* Size in bytes */
304 __le32 i_atime; /* Access time */
305 __le32 i_ctime; /* Creation time */
306 __le32 i_mtime; /* Modification time */
307 __le32 i_dtime; /* Deletion Time */
308 __le16 i_gid; /* Low 16 bits of Group Id */
309 __le16 i_links_count; /* Links count */
310 __le32 i_blocks; /* Blocks count */
311 __le32 i_flags; /* File flags */
312 union {
313 struct {
314 __le32 l_i_reserved1;
315 } linux1;
316 struct {
317 __le32 h_i_translator;
318 } hurd1;
319 struct {
320 __le32 m_i_reserved1;
321 } masix1;
322 } osd1; /* OS dependent 1 */
323 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
324 __le32 i_generation; /* File version (for NFS) */
325 __le32 i_file_acl; /* File ACL */
326 __le32 i_dir_acl; /* Directory ACL */
327 __le32 i_faddr; /* Fragment address */
328 union {
329 struct {
330 __u8 l_i_frag; /* Fragment number */
331 __u8 l_i_fsize; /* Fragment size */
332 __u16 i_pad1;
333 __le16 l_i_uid_high; /* these 2 fields */
334 __le16 l_i_gid_high; /* were reserved2[0] */
335 __u32 l_i_reserved2;
336 } linux2;
337 struct {
338 __u8 h_i_frag; /* Fragment number */
339 __u8 h_i_fsize; /* Fragment size */
340 __le16 h_i_mode_high;
341 __le16 h_i_uid_high;
342 __le16 h_i_gid_high;
343 __le32 h_i_author;
344 } hurd2;
345 struct {
346 __u8 m_i_frag; /* Fragment number */
347 __u8 m_i_fsize; /* Fragment size */
348 __u16 m_pad1;
349 __u32 m_i_reserved2[2];
350 } masix2;
351 } osd2; /* OS dependent 2 */
352 };
353
354 #define i_size_high i_dir_acl
355
356 #define i_reserved1 osd1.linux1.l_i_reserved1
357 #define i_frag osd2.linux2.l_i_frag
358 #define i_fsize osd2.linux2.l_i_fsize
359 #define i_uid_low i_uid
360 #define i_gid_low i_gid
361 #define i_uid_high osd2.linux2.l_i_uid_high
362 #define i_gid_high osd2.linux2.l_i_gid_high
363 #define i_reserved2 osd2.linux2.l_i_reserved2
364
365 /*
366 * File system states
367 */
368 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
369 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
370 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
371
372 /*
373 * Mount flags
374 */
375 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
376 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
377 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
378 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
379 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
380 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
381 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
382 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
383 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
384 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
385 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
386 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
387 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
388 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
389 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
390 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
391 #ifdef CONFIG_FS_DAX
392 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
393 #else
394 #define EXT2_MOUNT_DAX 0
395 #endif
396
397
398 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
399 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
400 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
401 EXT2_MOUNT_##opt)
402 /*
403 * Maximal mount counts between two filesystem checks
404 */
405 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
406 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
407
408 /*
409 * Behaviour when detecting errors
410 */
411 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
412 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
413 #define EXT2_ERRORS_PANIC 3 /* Panic */
414 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
415
416 /*
417 * Structure of the super block
418 */
419 struct ext2_super_block {
420 __le32 s_inodes_count; /* Inodes count */
421 __le32 s_blocks_count; /* Blocks count */
422 __le32 s_r_blocks_count; /* Reserved blocks count */
423 __le32 s_free_blocks_count; /* Free blocks count */
424 __le32 s_free_inodes_count; /* Free inodes count */
425 __le32 s_first_data_block; /* First Data Block */
426 __le32 s_log_block_size; /* Block size */
427 __le32 s_log_frag_size; /* Fragment size */
428 __le32 s_blocks_per_group; /* # Blocks per group */
429 __le32 s_frags_per_group; /* # Fragments per group */
430 __le32 s_inodes_per_group; /* # Inodes per group */
431 __le32 s_mtime; /* Mount time */
432 __le32 s_wtime; /* Write time */
433 __le16 s_mnt_count; /* Mount count */
434 __le16 s_max_mnt_count; /* Maximal mount count */
435 __le16 s_magic; /* Magic signature */
436 __le16 s_state; /* File system state */
437 __le16 s_errors; /* Behaviour when detecting errors */
438 __le16 s_minor_rev_level; /* minor revision level */
439 __le32 s_lastcheck; /* time of last check */
440 __le32 s_checkinterval; /* max. time between checks */
441 __le32 s_creator_os; /* OS */
442 __le32 s_rev_level; /* Revision level */
443 __le16 s_def_resuid; /* Default uid for reserved blocks */
444 __le16 s_def_resgid; /* Default gid for reserved blocks */
445 /*
446 * These fields are for EXT2_DYNAMIC_REV superblocks only.
447 *
448 * Note: the difference between the compatible feature set and
449 * the incompatible feature set is that if there is a bit set
450 * in the incompatible feature set that the kernel doesn't
451 * know about, it should refuse to mount the filesystem.
452 *
453 * e2fsck's requirements are more strict; if it doesn't know
454 * about a feature in either the compatible or incompatible
455 * feature set, it must abort and not try to meddle with
456 * things it doesn't understand...
457 */
458 __le32 s_first_ino; /* First non-reserved inode */
459 __le16 s_inode_size; /* size of inode structure */
460 __le16 s_block_group_nr; /* block group # of this superblock */
461 __le32 s_feature_compat; /* compatible feature set */
462 __le32 s_feature_incompat; /* incompatible feature set */
463 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
464 __u8 s_uuid[16]; /* 128-bit uuid for volume */
465 char s_volume_name[16]; /* volume name */
466 char s_last_mounted[64]; /* directory where last mounted */
467 __le32 s_algorithm_usage_bitmap; /* For compression */
468 /*
469 * Performance hints. Directory preallocation should only
470 * happen if the EXT2_COMPAT_PREALLOC flag is on.
471 */
472 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
473 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
474 __u16 s_padding1;
475 /*
476 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
477 */
478 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
479 __u32 s_journal_inum; /* inode number of journal file */
480 __u32 s_journal_dev; /* device number of journal file */
481 __u32 s_last_orphan; /* start of list of inodes to delete */
482 __u32 s_hash_seed[4]; /* HTREE hash seed */
483 __u8 s_def_hash_version; /* Default hash version to use */
484 __u8 s_reserved_char_pad;
485 __u16 s_reserved_word_pad;
486 __le32 s_default_mount_opts;
487 __le32 s_first_meta_bg; /* First metablock block group */
488 __u32 s_reserved[190]; /* Padding to the end of the block */
489 };
490
491 /*
492 * Codes for operating systems
493 */
494 #define EXT2_OS_LINUX 0
495 #define EXT2_OS_HURD 1
496 #define EXT2_OS_MASIX 2
497 #define EXT2_OS_FREEBSD 3
498 #define EXT2_OS_LITES 4
499
500 /*
501 * Revision levels
502 */
503 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
504 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
505
506 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
507 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
508
509 #define EXT2_GOOD_OLD_INODE_SIZE 128
510
511 /*
512 * Feature set definitions
513 */
514
515 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
516 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
517 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
518 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
519 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
520 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
521 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
522 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
523 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
524 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
525 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
526 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
527 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
528 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
529 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
530 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
531 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
532 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
533
534 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
535 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
536 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
537 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
538 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
539 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
540 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
541
542 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
543 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
544 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
545 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
546
547 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
548 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
549 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
550 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
551 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
552 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
553
554 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
555 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
556 EXT2_FEATURE_INCOMPAT_META_BG)
557 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
558 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
559 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
560 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
561 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
562
563 /*
564 * Default values for user and/or group using reserved blocks
565 */
566 #define EXT2_DEF_RESUID 0
567 #define EXT2_DEF_RESGID 0
568
569 /*
570 * Default mount options
571 */
572 #define EXT2_DEFM_DEBUG 0x0001
573 #define EXT2_DEFM_BSDGROUPS 0x0002
574 #define EXT2_DEFM_XATTR_USER 0x0004
575 #define EXT2_DEFM_ACL 0x0008
576 #define EXT2_DEFM_UID16 0x0010
577 /* Not used by ext2, but reserved for use by ext3 */
578 #define EXT3_DEFM_JMODE 0x0060
579 #define EXT3_DEFM_JMODE_DATA 0x0020
580 #define EXT3_DEFM_JMODE_ORDERED 0x0040
581 #define EXT3_DEFM_JMODE_WBACK 0x0060
582
583 /*
584 * Structure of a directory entry
585 */
586
587 struct ext2_dir_entry {
588 __le32 inode; /* Inode number */
589 __le16 rec_len; /* Directory entry length */
590 __le16 name_len; /* Name length */
591 char name[]; /* File name, up to EXT2_NAME_LEN */
592 };
593
594 /*
595 * The new version of the directory entry. Since EXT2 structures are
596 * stored in intel byte order, and the name_len field could never be
597 * bigger than 255 chars, it's safe to reclaim the extra byte for the
598 * file_type field.
599 */
600 struct ext2_dir_entry_2 {
601 __le32 inode; /* Inode number */
602 __le16 rec_len; /* Directory entry length */
603 __u8 name_len; /* Name length */
604 __u8 file_type;
605 char name[]; /* File name, up to EXT2_NAME_LEN */
606 };
607
608 /*
609 * Ext2 directory file types. Only the low 3 bits are used. The
610 * other bits are reserved for now.
611 */
612 enum {
613 EXT2_FT_UNKNOWN = 0,
614 EXT2_FT_REG_FILE = 1,
615 EXT2_FT_DIR = 2,
616 EXT2_FT_CHRDEV = 3,
617 EXT2_FT_BLKDEV = 4,
618 EXT2_FT_FIFO = 5,
619 EXT2_FT_SOCK = 6,
620 EXT2_FT_SYMLINK = 7,
621 EXT2_FT_MAX
622 };
623
624 /*
625 * EXT2_DIR_PAD defines the directory entries boundaries
626 *
627 * NOTE: It must be a multiple of 4
628 */
629 #define EXT2_DIR_PAD 4
630 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
631 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
632 ~EXT2_DIR_ROUND)
633 #define EXT2_MAX_REC_LEN ((1<<16)-1)
634
verify_offsets(void)635 static inline void verify_offsets(void)
636 {
637 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
638 A(EXT2_SB_MAGIC_OFFSET, s_magic);
639 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count);
640 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size);
641 #undef A
642 }
643
644 /*
645 * ext2 mount options
646 */
647 struct ext2_mount_options {
648 unsigned long s_mount_opt;
649 kuid_t s_resuid;
650 kgid_t s_resgid;
651 };
652
653 /*
654 * second extended file system inode data in memory
655 */
656 struct ext2_inode_info {
657 __le32 i_data[15];
658 __u32 i_flags;
659 __u32 i_faddr;
660 __u8 i_frag_no;
661 __u8 i_frag_size;
662 __u16 i_state;
663 __u32 i_file_acl;
664 __u32 i_dir_acl;
665 __u32 i_dtime;
666
667 /*
668 * i_block_group is the number of the block group which contains
669 * this file's inode. Constant across the lifetime of the inode,
670 * it is used for making block allocation decisions - we try to
671 * place a file's data blocks near its inode block, and new inodes
672 * near to their parent directory's inode.
673 */
674 __u32 i_block_group;
675
676 /* block reservation info */
677 struct ext2_block_alloc_info *i_block_alloc_info;
678
679 __u32 i_dir_start_lookup;
680 #ifdef CONFIG_EXT2_FS_XATTR
681 /*
682 * Extended attributes can be read independently of the main file
683 * data. Taking i_mutex even when reading would cause contention
684 * between readers of EAs and writers of regular file data, so
685 * instead we synchronize on xattr_sem when reading or changing
686 * EAs.
687 */
688 struct rw_semaphore xattr_sem;
689 #endif
690 rwlock_t i_meta_lock;
691 #ifdef CONFIG_FS_DAX
692 struct rw_semaphore dax_sem;
693 #endif
694
695 /*
696 * truncate_mutex is for serialising ext2_truncate() against
697 * ext2_getblock(). It also protects the internals of the inode's
698 * reservation data structures: ext2_reserve_window and
699 * ext2_reserve_window_node.
700 */
701 struct mutex truncate_mutex;
702 struct inode vfs_inode;
703 struct list_head i_orphan; /* unlinked but open inodes */
704 #ifdef CONFIG_QUOTA
705 struct dquot *i_dquot[MAXQUOTAS];
706 #endif
707 };
708
709 #ifdef CONFIG_FS_DAX
710 #define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem)
711 #define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem)
712 #else
713 #define dax_sem_down_write(ext2_inode)
714 #define dax_sem_up_write(ext2_inode)
715 #endif
716
717 /*
718 * Inode dynamic state flags
719 */
720 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
721
722
723 /*
724 * Function prototypes
725 */
726
727 /*
728 * Ok, these declarations are also in <linux/kernel.h> but none of the
729 * ext2 source programs needs to include it so they are duplicated here.
730 */
731
EXT2_I(struct inode * inode)732 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
733 {
734 return container_of(inode, struct ext2_inode_info, vfs_inode);
735 }
736
737 /* balloc.c */
738 extern int ext2_bg_has_super(struct super_block *sb, int group);
739 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
740 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
741 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
742 unsigned long *, int *);
743 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
744 unsigned int count);
745 extern void ext2_free_blocks (struct inode *, unsigned long,
746 unsigned long);
747 extern unsigned long ext2_count_free_blocks (struct super_block *);
748 extern unsigned long ext2_count_dirs (struct super_block *);
749 extern void ext2_check_blocks_bitmap (struct super_block *);
750 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
751 unsigned int block_group,
752 struct buffer_head ** bh);
753 extern void ext2_discard_reservation (struct inode *);
754 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
755 extern void ext2_init_block_alloc_info(struct inode *);
756 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
757
758 /* dir.c */
759 extern int ext2_add_link (struct dentry *, struct inode *);
760 extern ino_t ext2_inode_by_name(struct inode *, const struct qstr *);
761 extern int ext2_make_empty(struct inode *, struct inode *);
762 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,const struct qstr *, struct page **);
763 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
764 extern int ext2_empty_dir (struct inode *);
765 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
766 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int);
767
768 /* ialloc.c */
769 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);
770 extern void ext2_free_inode (struct inode *);
771 extern unsigned long ext2_count_free_inodes (struct super_block *);
772 extern void ext2_check_inodes_bitmap (struct super_block *);
773 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
774
775 /* inode.c */
776 extern struct inode *ext2_iget (struct super_block *, unsigned long);
777 extern int ext2_write_inode (struct inode *, struct writeback_control *);
778 extern void ext2_evict_inode(struct inode *);
779 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
780 extern int ext2_setattr (struct dentry *, struct iattr *);
781 extern void ext2_set_inode_flags(struct inode *inode);
782 extern void ext2_get_inode_flags(struct ext2_inode_info *);
783 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
784 u64 start, u64 len);
785
786 /* ioctl.c */
787 extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
788 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
789
790 /* namei.c */
791 struct dentry *ext2_get_parent(struct dentry *child);
792
793 /* super.c */
794 extern __printf(3, 4)
795 void ext2_error(struct super_block *, const char *, const char *, ...);
796 extern __printf(3, 4)
797 void ext2_msg(struct super_block *, const char *, const char *, ...);
798 extern void ext2_update_dynamic_rev (struct super_block *sb);
799 extern void ext2_write_super (struct super_block *);
800
801 /*
802 * Inodes and files operations
803 */
804
805 /* dir.c */
806 extern const struct file_operations ext2_dir_operations;
807
808 /* file.c */
809 extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
810 int datasync);
811 extern const struct inode_operations ext2_file_inode_operations;
812 extern const struct file_operations ext2_file_operations;
813
814 /* inode.c */
815 extern const struct address_space_operations ext2_aops;
816 extern const struct address_space_operations ext2_nobh_aops;
817 extern struct iomap_ops ext2_iomap_ops;
818
819 /* namei.c */
820 extern const struct inode_operations ext2_dir_inode_operations;
821 extern const struct inode_operations ext2_special_inode_operations;
822
823 /* symlink.c */
824 extern const struct inode_operations ext2_fast_symlink_inode_operations;
825 extern const struct inode_operations ext2_symlink_inode_operations;
826
827 static inline ext2_fsblk_t
ext2_group_first_block_no(struct super_block * sb,unsigned long group_no)828 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
829 {
830 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
831 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
832 }
833
834 #define ext2_set_bit __test_and_set_bit_le
835 #define ext2_clear_bit __test_and_clear_bit_le
836 #define ext2_test_bit test_bit_le
837 #define ext2_find_first_zero_bit find_first_zero_bit_le
838 #define ext2_find_next_zero_bit find_next_zero_bit_le
839