1 /* SPDX-License-Identifier: GPL-2.0 */
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 */
14 #include <linux/fs.h>
15 #include <linux/ext2_fs.h>
16 #include <linux/blockgroup_lock.h>
17 #include <linux/percpu_counter.h>
18 #include <linux/rbtree.h>
19 #include <linux/mm.h>
20 #include <linux/highmem.h>
21
22 /* XXX Here for now... not interested in restructing headers JUST now */
23
24 /* data type for block offset of block group */
25 typedef int ext2_grpblk_t;
26
27 /* data type for filesystem-wide blocks number */
28 typedef unsigned long ext2_fsblk_t;
29
30 #define E2FSBLK "%lu"
31
32 struct ext2_reserve_window {
33 ext2_fsblk_t _rsv_start; /* First byte reserved */
34 ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */
35 };
36
37 struct ext2_reserve_window_node {
38 struct rb_node rsv_node;
39 __u32 rsv_goal_size;
40 __u32 rsv_alloc_hit;
41 struct ext2_reserve_window rsv_window;
42 };
43
44 struct ext2_block_alloc_info {
45 /* information about reservation window */
46 struct ext2_reserve_window_node rsv_window_node;
47 /*
48 * was i_next_alloc_block in ext2_inode_info
49 * is the logical (file-relative) number of the
50 * most-recently-allocated block in this file.
51 * We use this for detecting linearly ascending allocation requests.
52 */
53 __u32 last_alloc_logical_block;
54 /*
55 * Was i_next_alloc_goal in ext2_inode_info
56 * is the *physical* companion to i_next_alloc_block.
57 * it is the physical block number of the block which was most-recently
58 * allocated to this file. This gives us the goal (target) for the next
59 * allocation when we detect linearly ascending requests.
60 */
61 ext2_fsblk_t last_alloc_physical_block;
62 };
63
64 #define rsv_start rsv_window._rsv_start
65 #define rsv_end rsv_window._rsv_end
66
67 struct mb_cache;
68
69 /*
70 * second extended-fs super-block data in memory
71 */
72 struct ext2_sb_info {
73 unsigned long s_frag_size; /* Size of a fragment in bytes */
74 unsigned long s_frags_per_block;/* Number of fragments per block */
75 unsigned long s_inodes_per_block;/* Number of inodes per block */
76 unsigned long s_frags_per_group;/* Number of fragments in a group */
77 unsigned long s_blocks_per_group;/* Number of blocks in a group */
78 unsigned long s_inodes_per_group;/* Number of inodes in a group */
79 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
80 unsigned long s_gdb_count; /* Number of group descriptor blocks */
81 unsigned long s_desc_per_block; /* Number of group descriptors per block */
82 unsigned long s_groups_count; /* Number of groups in the fs */
83 unsigned long s_overhead_last; /* Last calculated overhead */
84 unsigned long s_blocks_last; /* Last seen block count */
85 struct buffer_head * s_sbh; /* Buffer containing the super block */
86 struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
87 struct buffer_head ** s_group_desc;
88 unsigned long s_mount_opt;
89 unsigned long s_sb_block;
90 kuid_t s_resuid;
91 kgid_t s_resgid;
92 unsigned short s_mount_state;
93 unsigned short s_pad;
94 int s_addr_per_block_bits;
95 int s_desc_per_block_bits;
96 int s_inode_size;
97 int s_first_ino;
98 spinlock_t s_next_gen_lock;
99 u32 s_next_generation;
100 unsigned long s_dir_count;
101 u8 *s_debts;
102 struct percpu_counter s_freeblocks_counter;
103 struct percpu_counter s_freeinodes_counter;
104 struct percpu_counter s_dirs_counter;
105 struct blockgroup_lock *s_blockgroup_lock;
106 /* root of the per fs reservation window tree */
107 spinlock_t s_rsv_window_lock;
108 struct rb_root s_rsv_window_root;
109 struct ext2_reserve_window_node s_rsv_window_head;
110 /*
111 * s_lock protects against concurrent modifications of s_mount_state,
112 * s_blocks_last, s_overhead_last and the content of superblock's
113 * buffer pointed to by sbi->s_es.
114 *
115 * Note: It is used in ext2_show_options() to provide a consistent view
116 * of the mount options.
117 */
118 spinlock_t s_lock;
119 struct mb_cache *s_ea_block_cache;
120 struct dax_device *s_daxdev;
121 };
122
123 static inline spinlock_t *
sb_bgl_lock(struct ext2_sb_info * sbi,unsigned int block_group)124 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
125 {
126 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
127 }
128
129 /*
130 * Define EXT2FS_DEBUG to produce debug messages
131 */
132 #undef EXT2FS_DEBUG
133
134 /*
135 * Define EXT2_RESERVATION to reserve data blocks for expanding files
136 */
137 #define EXT2_DEFAULT_RESERVE_BLOCKS 8
138 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
139 #define EXT2_MAX_RESERVE_BLOCKS 1027
140 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
141 /*
142 * The second extended file system version
143 */
144 #define EXT2FS_DATE "95/08/09"
145 #define EXT2FS_VERSION "0.5b"
146
147 /*
148 * Debug code
149 */
150 #ifdef EXT2FS_DEBUG
151 # define ext2_debug(f, a...) { \
152 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
153 __FILE__, __LINE__, __func__); \
154 printk (f, ## a); \
155 }
156 #else
157 # define ext2_debug(f, a...) /**/
158 #endif
159
160 /*
161 * Special inode numbers
162 */
163 #define EXT2_BAD_INO 1 /* Bad blocks inode */
164 #define EXT2_ROOT_INO 2 /* Root inode */
165 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
166 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
167
168 /* First non-reserved inode for old ext2 filesystems */
169 #define EXT2_GOOD_OLD_FIRST_INO 11
170
EXT2_SB(struct super_block * sb)171 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
172 {
173 return sb->s_fs_info;
174 }
175
176 /*
177 * Macro-instructions used to manage several block sizes
178 */
179 #define EXT2_MIN_BLOCK_SIZE 1024
180 #define EXT2_MAX_BLOCK_SIZE 4096
181 #define EXT2_MIN_BLOCK_LOG_SIZE 10
182 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
183 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
184 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
185 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
186 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
187 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
188
189 /*
190 * Macro-instructions used to manage fragments
191 */
192 #define EXT2_MIN_FRAG_SIZE 1024
193 #define EXT2_MAX_FRAG_SIZE 4096
194 #define EXT2_MIN_FRAG_LOG_SIZE 10
195 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
196 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
197
198 /*
199 * Structure of a blocks group descriptor
200 */
201 struct ext2_group_desc
202 {
203 __le32 bg_block_bitmap; /* Blocks bitmap block */
204 __le32 bg_inode_bitmap; /* Inodes bitmap block */
205 __le32 bg_inode_table; /* Inodes table block */
206 __le16 bg_free_blocks_count; /* Free blocks count */
207 __le16 bg_free_inodes_count; /* Free inodes count */
208 __le16 bg_used_dirs_count; /* Directories count */
209 __le16 bg_pad;
210 __le32 bg_reserved[3];
211 };
212
213 /*
214 * Macro-instructions used to manage group descriptors
215 */
216 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
217 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
218 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
219 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
220
221 /*
222 * Constants relative to the data blocks
223 */
224 #define EXT2_NDIR_BLOCKS 12
225 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
226 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
227 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
228 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
229
230 /*
231 * Inode flags (GETFLAGS/SETFLAGS)
232 */
233 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
234 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
235 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
236 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
237 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
238 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
239 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
240 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
241 /* Reserved for compression usage... */
242 #define EXT2_DIRTY_FL FS_DIRTY_FL
243 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
244 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
245 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
246 /* End compression flags --- maybe not all used */
247 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
248 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
249 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
250 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
251 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
252 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
253 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
254 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
255
256 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
257 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
258
259 /* Flags that should be inherited by new inodes from their parent. */
260 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
261 EXT2_SYNC_FL | EXT2_NODUMP_FL |\
262 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
263 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
264 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
265
266 /* Flags that are appropriate for regular files (all but dir-specific ones). */
267 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
268
269 /* Flags that are appropriate for non-directories/regular files. */
270 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
271
272 /* Mask out flags that are inappropriate for the given type of inode. */
ext2_mask_flags(umode_t mode,__u32 flags)273 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
274 {
275 if (S_ISDIR(mode))
276 return flags;
277 else if (S_ISREG(mode))
278 return flags & EXT2_REG_FLMASK;
279 else
280 return flags & EXT2_OTHER_FLMASK;
281 }
282
283 /*
284 * ioctl commands
285 */
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_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_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
376 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
377 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
378 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
379 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
380 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
381 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
382 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
383 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
384 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
385 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
386 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
387 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
388 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
389 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
390 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
391
392
393 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
394 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
395 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
396 EXT2_MOUNT_##opt)
397 /*
398 * Maximal mount counts between two filesystem checks
399 */
400 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
401 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
402
403 /*
404 * Behaviour when detecting errors
405 */
406 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
407 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
408 #define EXT2_ERRORS_PANIC 3 /* Panic */
409 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
410
411 /*
412 * Structure of the super block
413 */
414 struct ext2_super_block {
415 __le32 s_inodes_count; /* Inodes count */
416 __le32 s_blocks_count; /* Blocks count */
417 __le32 s_r_blocks_count; /* Reserved blocks count */
418 __le32 s_free_blocks_count; /* Free blocks count */
419 __le32 s_free_inodes_count; /* Free inodes count */
420 __le32 s_first_data_block; /* First Data Block */
421 __le32 s_log_block_size; /* Block size */
422 __le32 s_log_frag_size; /* Fragment size */
423 __le32 s_blocks_per_group; /* # Blocks per group */
424 __le32 s_frags_per_group; /* # Fragments per group */
425 __le32 s_inodes_per_group; /* # Inodes per group */
426 __le32 s_mtime; /* Mount time */
427 __le32 s_wtime; /* Write time */
428 __le16 s_mnt_count; /* Mount count */
429 __le16 s_max_mnt_count; /* Maximal mount count */
430 __le16 s_magic; /* Magic signature */
431 __le16 s_state; /* File system state */
432 __le16 s_errors; /* Behaviour when detecting errors */
433 __le16 s_minor_rev_level; /* minor revision level */
434 __le32 s_lastcheck; /* time of last check */
435 __le32 s_checkinterval; /* max. time between checks */
436 __le32 s_creator_os; /* OS */
437 __le32 s_rev_level; /* Revision level */
438 __le16 s_def_resuid; /* Default uid for reserved blocks */
439 __le16 s_def_resgid; /* Default gid for reserved blocks */
440 /*
441 * These fields are for EXT2_DYNAMIC_REV superblocks only.
442 *
443 * Note: the difference between the compatible feature set and
444 * the incompatible feature set is that if there is a bit set
445 * in the incompatible feature set that the kernel doesn't
446 * know about, it should refuse to mount the filesystem.
447 *
448 * e2fsck's requirements are more strict; if it doesn't know
449 * about a feature in either the compatible or incompatible
450 * feature set, it must abort and not try to meddle with
451 * things it doesn't understand...
452 */
453 __le32 s_first_ino; /* First non-reserved inode */
454 __le16 s_inode_size; /* size of inode structure */
455 __le16 s_block_group_nr; /* block group # of this superblock */
456 __le32 s_feature_compat; /* compatible feature set */
457 __le32 s_feature_incompat; /* incompatible feature set */
458 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
459 __u8 s_uuid[16]; /* 128-bit uuid for volume */
460 char s_volume_name[16]; /* volume name */
461 char s_last_mounted[64]; /* directory where last mounted */
462 __le32 s_algorithm_usage_bitmap; /* For compression */
463 /*
464 * Performance hints. Directory preallocation should only
465 * happen if the EXT2_COMPAT_PREALLOC flag is on.
466 */
467 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
468 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
469 __u16 s_padding1;
470 /*
471 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
472 */
473 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
474 __u32 s_journal_inum; /* inode number of journal file */
475 __u32 s_journal_dev; /* device number of journal file */
476 __u32 s_last_orphan; /* start of list of inodes to delete */
477 __u32 s_hash_seed[4]; /* HTREE hash seed */
478 __u8 s_def_hash_version; /* Default hash version to use */
479 __u8 s_reserved_char_pad;
480 __u16 s_reserved_word_pad;
481 __le32 s_default_mount_opts;
482 __le32 s_first_meta_bg; /* First metablock block group */
483 __u32 s_reserved[190]; /* Padding to the end of the block */
484 };
485
486 /*
487 * Codes for operating systems
488 */
489 #define EXT2_OS_LINUX 0
490 #define EXT2_OS_HURD 1
491 #define EXT2_OS_MASIX 2
492 #define EXT2_OS_FREEBSD 3
493 #define EXT2_OS_LITES 4
494
495 /*
496 * Revision levels
497 */
498 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
499 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
500
501 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
502 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
503
504 #define EXT2_GOOD_OLD_INODE_SIZE 128
505
506 /*
507 * Feature set definitions
508 */
509
510 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
511 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
512 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
513 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
514 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
515 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
516 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
517 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
518 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
519 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
520 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
521 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
522 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
523 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
524 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
525 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
526 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
527 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
528
529 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
530 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
531 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
532 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
533 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
534 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
535 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
536
537 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
538 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
539 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
540 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
541
542 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
543 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
544 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
545 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
546 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
547 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
548
549 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
550 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
551 EXT2_FEATURE_INCOMPAT_META_BG)
552 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
553 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
554 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
555 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
556 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
557
558 /*
559 * Default values for user and/or group using reserved blocks
560 */
561 #define EXT2_DEF_RESUID 0
562 #define EXT2_DEF_RESGID 0
563
564 /*
565 * Default mount options
566 */
567 #define EXT2_DEFM_DEBUG 0x0001
568 #define EXT2_DEFM_BSDGROUPS 0x0002
569 #define EXT2_DEFM_XATTR_USER 0x0004
570 #define EXT2_DEFM_ACL 0x0008
571 #define EXT2_DEFM_UID16 0x0010
572 /* Not used by ext2, but reserved for use by ext3 */
573 #define EXT3_DEFM_JMODE 0x0060
574 #define EXT3_DEFM_JMODE_DATA 0x0020
575 #define EXT3_DEFM_JMODE_ORDERED 0x0040
576 #define EXT3_DEFM_JMODE_WBACK 0x0060
577
578 /*
579 * Structure of a directory entry
580 */
581
582 struct ext2_dir_entry {
583 __le32 inode; /* Inode number */
584 __le16 rec_len; /* Directory entry length */
585 __le16 name_len; /* Name length */
586 char name[]; /* File name, up to EXT2_NAME_LEN */
587 };
588
589 /*
590 * The new version of the directory entry. Since EXT2 structures are
591 * stored in intel byte order, and the name_len field could never be
592 * bigger than 255 chars, it's safe to reclaim the extra byte for the
593 * file_type field.
594 */
595 struct ext2_dir_entry_2 {
596 __le32 inode; /* Inode number */
597 __le16 rec_len; /* Directory entry length */
598 __u8 name_len; /* Name length */
599 __u8 file_type;
600 char name[]; /* File name, up to EXT2_NAME_LEN */
601 };
602
603 /*
604 * EXT2_DIR_PAD defines the directory entries boundaries
605 *
606 * NOTE: It must be a multiple of 4
607 */
608 #define EXT2_DIR_PAD 4
609 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
610 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
611 ~EXT2_DIR_ROUND)
612 #define EXT2_MAX_REC_LEN ((1<<16)-1)
613
verify_offsets(void)614 static inline void verify_offsets(void)
615 {
616 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
617 A(EXT2_SB_MAGIC_OFFSET, s_magic);
618 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count);
619 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size);
620 #undef A
621 }
622
623 /*
624 * ext2 mount options
625 */
626 struct ext2_mount_options {
627 unsigned long s_mount_opt;
628 kuid_t s_resuid;
629 kgid_t s_resgid;
630 };
631
632 /*
633 * second extended file system inode data in memory
634 */
635 struct ext2_inode_info {
636 __le32 i_data[15];
637 __u32 i_flags;
638 __u32 i_faddr;
639 __u8 i_frag_no;
640 __u8 i_frag_size;
641 __u16 i_state;
642 __u32 i_file_acl;
643 __u32 i_dir_acl;
644 __u32 i_dtime;
645
646 /*
647 * i_block_group is the number of the block group which contains
648 * this file's inode. Constant across the lifetime of the inode,
649 * it is used for making block allocation decisions - we try to
650 * place a file's data blocks near its inode block, and new inodes
651 * near to their parent directory's inode.
652 */
653 __u32 i_block_group;
654
655 /* block reservation info */
656 struct ext2_block_alloc_info *i_block_alloc_info;
657
658 __u32 i_dir_start_lookup;
659 #ifdef CONFIG_EXT2_FS_XATTR
660 /*
661 * Extended attributes can be read independently of the main file
662 * data. Taking i_mutex even when reading would cause contention
663 * between readers of EAs and writers of regular file data, so
664 * instead we synchronize on xattr_sem when reading or changing
665 * EAs.
666 */
667 struct rw_semaphore xattr_sem;
668 #endif
669 rwlock_t i_meta_lock;
670 #ifdef CONFIG_FS_DAX
671 struct rw_semaphore dax_sem;
672 #endif
673
674 /*
675 * truncate_mutex is for serialising ext2_truncate() against
676 * ext2_getblock(). It also protects the internals of the inode's
677 * reservation data structures: ext2_reserve_window and
678 * ext2_reserve_window_node.
679 */
680 struct mutex truncate_mutex;
681 struct inode vfs_inode;
682 struct list_head i_orphan; /* unlinked but open inodes */
683 #ifdef CONFIG_QUOTA
684 struct dquot *i_dquot[MAXQUOTAS];
685 #endif
686 };
687
688 #ifdef CONFIG_FS_DAX
689 #define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem)
690 #define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem)
691 #else
692 #define dax_sem_down_write(ext2_inode)
693 #define dax_sem_up_write(ext2_inode)
694 #endif
695
696 /*
697 * Inode dynamic state flags
698 */
699 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
700
701
702 /*
703 * Function prototypes
704 */
705
706 /*
707 * Ok, these declarations are also in <linux/kernel.h> but none of the
708 * ext2 source programs needs to include it so they are duplicated here.
709 */
710
EXT2_I(struct inode * inode)711 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
712 {
713 return container_of(inode, struct ext2_inode_info, vfs_inode);
714 }
715
716 /* balloc.c */
717 extern int ext2_bg_has_super(struct super_block *sb, int group);
718 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
719 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
720 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
721 unsigned long *, int *);
722 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
723 unsigned int count);
724 extern void ext2_free_blocks (struct inode *, unsigned long,
725 unsigned long);
726 extern unsigned long ext2_count_free_blocks (struct super_block *);
727 extern unsigned long ext2_count_dirs (struct super_block *);
728 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
729 unsigned int block_group,
730 struct buffer_head ** bh);
731 extern void ext2_discard_reservation (struct inode *);
732 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
733 extern void ext2_init_block_alloc_info(struct inode *);
734 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
735
736 /* dir.c */
737 extern int ext2_add_link (struct dentry *, struct inode *);
738 extern int ext2_inode_by_name(struct inode *dir,
739 const struct qstr *child, ino_t *ino);
740 extern int ext2_make_empty(struct inode *, struct inode *);
741 extern struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *,
742 struct page **, void **res_page_addr);
743 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
744 extern int ext2_empty_dir (struct inode *);
745 extern struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p, void **pa);
746 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, void *,
747 struct inode *, int);
ext2_put_page(struct page * page,void * page_addr)748 static inline void ext2_put_page(struct page *page, void *page_addr)
749 {
750 kunmap_local(page_addr);
751 put_page(page);
752 }
753
754 /* ialloc.c */
755 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);
756 extern void ext2_free_inode (struct inode *);
757 extern unsigned long ext2_count_free_inodes (struct super_block *);
758 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
759
760 /* inode.c */
761 extern struct inode *ext2_iget (struct super_block *, unsigned long);
762 extern int ext2_write_inode (struct inode *, struct writeback_control *);
763 extern void ext2_evict_inode(struct inode *);
764 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
765 extern int ext2_setattr (struct user_namespace *, struct dentry *, struct iattr *);
766 extern int ext2_getattr (struct user_namespace *, const struct path *,
767 struct kstat *, u32, unsigned int);
768 extern void ext2_set_inode_flags(struct inode *inode);
769 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
770 u64 start, u64 len);
771
772 /* ioctl.c */
773 extern int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa);
774 extern int ext2_fileattr_set(struct user_namespace *mnt_userns,
775 struct dentry *dentry, struct fileattr *fa);
776 extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
777 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
778
779 /* namei.c */
780 struct dentry *ext2_get_parent(struct dentry *child);
781
782 /* super.c */
783 extern __printf(3, 4)
784 void ext2_error(struct super_block *, const char *, const char *, ...);
785 extern __printf(3, 4)
786 void ext2_msg(struct super_block *, const char *, const char *, ...);
787 extern void ext2_update_dynamic_rev (struct super_block *sb);
788 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
789 int wait);
790
791 /*
792 * Inodes and files operations
793 */
794
795 /* dir.c */
796 extern const struct file_operations ext2_dir_operations;
797
798 /* file.c */
799 extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
800 int datasync);
801 extern const struct inode_operations ext2_file_inode_operations;
802 extern const struct file_operations ext2_file_operations;
803
804 /* inode.c */
805 extern void ext2_set_file_ops(struct inode *inode);
806 extern const struct address_space_operations ext2_aops;
807 extern const struct address_space_operations ext2_nobh_aops;
808 extern const struct iomap_ops ext2_iomap_ops;
809
810 /* namei.c */
811 extern const struct inode_operations ext2_dir_inode_operations;
812 extern const struct inode_operations ext2_special_inode_operations;
813
814 /* symlink.c */
815 extern const struct inode_operations ext2_fast_symlink_inode_operations;
816 extern const struct inode_operations ext2_symlink_inode_operations;
817
818 static inline ext2_fsblk_t
ext2_group_first_block_no(struct super_block * sb,unsigned long group_no)819 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
820 {
821 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
822 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
823 }
824
825 static inline ext2_fsblk_t
ext2_group_last_block_no(struct super_block * sb,unsigned long group_no)826 ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
827 {
828 struct ext2_sb_info *sbi = EXT2_SB(sb);
829
830 if (group_no == sbi->s_groups_count - 1)
831 return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
832 else
833 return ext2_group_first_block_no(sb, group_no) +
834 EXT2_BLOCKS_PER_GROUP(sb) - 1;
835 }
836
837 #define ext2_set_bit __test_and_set_bit_le
838 #define ext2_clear_bit __test_and_clear_bit_le
839 #define ext2_test_bit test_bit_le
840 #define ext2_find_first_zero_bit find_first_zero_bit_le
841 #define ext2_find_next_zero_bit find_next_zero_bit_le
842