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 u64 s_dax_part_off;
122 };
123
124 static inline spinlock_t *
sb_bgl_lock(struct ext2_sb_info * sbi,unsigned int block_group)125 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
126 {
127 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
128 }
129
130 /*
131 * Define EXT2FS_DEBUG to produce debug messages
132 */
133 #undef EXT2FS_DEBUG
134
135 /*
136 * Define EXT2_RESERVATION to reserve data blocks for expanding files
137 */
138 #define EXT2_DEFAULT_RESERVE_BLOCKS 8
139 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
140 #define EXT2_MAX_RESERVE_BLOCKS 1027
141 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
142 /*
143 * The second extended file system version
144 */
145 #define EXT2FS_DATE "95/08/09"
146 #define EXT2FS_VERSION "0.5b"
147
148 /*
149 * Debug code
150 */
151 #ifdef EXT2FS_DEBUG
152 # define ext2_debug(f, a...) { \
153 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
154 __FILE__, __LINE__, __func__); \
155 printk (f, ## a); \
156 }
157 #else
158 # define ext2_debug(f, a...) /**/
159 #endif
160
161 /*
162 * Special inode numbers
163 */
164 #define EXT2_BAD_INO 1 /* Bad blocks inode */
165 #define EXT2_ROOT_INO 2 /* Root inode */
166 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
167 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
168
169 /* First non-reserved inode for old ext2 filesystems */
170 #define EXT2_GOOD_OLD_FIRST_INO 11
171
EXT2_SB(struct super_block * sb)172 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
173 {
174 return sb->s_fs_info;
175 }
176
177 /*
178 * Macro-instructions used to manage several block sizes
179 */
180 #define EXT2_MIN_BLOCK_SIZE 1024
181 #define EXT2_MAX_BLOCK_SIZE 4096
182 #define EXT2_MIN_BLOCK_LOG_SIZE 10
183 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
184 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
185 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
186 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
187 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
188 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
189
190 /*
191 * Macro-instructions used to manage fragments
192 */
193 #define EXT2_MIN_FRAG_SIZE 1024
194 #define EXT2_MAX_FRAG_SIZE 4096
195 #define EXT2_MIN_FRAG_LOG_SIZE 10
196 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
197 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
198
199 /*
200 * Structure of a blocks group descriptor
201 */
202 struct ext2_group_desc
203 {
204 __le32 bg_block_bitmap; /* Blocks bitmap block */
205 __le32 bg_inode_bitmap; /* Inodes bitmap block */
206 __le32 bg_inode_table; /* Inodes table block */
207 __le16 bg_free_blocks_count; /* Free blocks count */
208 __le16 bg_free_inodes_count; /* Free inodes count */
209 __le16 bg_used_dirs_count; /* Directories count */
210 __le16 bg_pad;
211 __le32 bg_reserved[3];
212 };
213
214 /*
215 * Macro-instructions used to manage group descriptors
216 */
217 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
218 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
219 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
220 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
221
222 /*
223 * Constants relative to the data blocks
224 */
225 #define EXT2_NDIR_BLOCKS 12
226 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
227 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
228 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
229 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
230
231 /*
232 * Inode flags (GETFLAGS/SETFLAGS)
233 */
234 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
235 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
236 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
237 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
238 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
239 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
240 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
241 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
242 /* Reserved for compression usage... */
243 #define EXT2_DIRTY_FL FS_DIRTY_FL
244 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
245 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
246 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
247 /* End compression flags --- maybe not all used */
248 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
249 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
250 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
251 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
252 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
253 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
254 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
255 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
256
257 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
258 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
259
260 /* Flags that should be inherited by new inodes from their parent. */
261 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
262 EXT2_SYNC_FL | EXT2_NODUMP_FL |\
263 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
264 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
265 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
266
267 /* Flags that are appropriate for regular files (all but dir-specific ones). */
268 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
269
270 /* Flags that are appropriate for non-directories/regular files. */
271 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
272
273 /* Mask out flags that are inappropriate for the given type of inode. */
ext2_mask_flags(umode_t mode,__u32 flags)274 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
275 {
276 if (S_ISDIR(mode))
277 return flags;
278 else if (S_ISREG(mode))
279 return flags & EXT2_REG_FLMASK;
280 else
281 return flags & EXT2_OTHER_FLMASK;
282 }
283
284 /*
285 * ioctl commands
286 */
287 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
288 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
289 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
290 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
291
292 /*
293 * ioctl commands in 32 bit emulation
294 */
295 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
296 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
297
298 /*
299 * Structure of an inode on the disk
300 */
301 struct ext2_inode {
302 __le16 i_mode; /* File mode */
303 __le16 i_uid; /* Low 16 bits of Owner Uid */
304 __le32 i_size; /* Size in bytes */
305 __le32 i_atime; /* Access time */
306 __le32 i_ctime; /* Creation time */
307 __le32 i_mtime; /* Modification time */
308 __le32 i_dtime; /* Deletion Time */
309 __le16 i_gid; /* Low 16 bits of Group Id */
310 __le16 i_links_count; /* Links count */
311 __le32 i_blocks; /* Blocks count */
312 __le32 i_flags; /* File flags */
313 union {
314 struct {
315 __le32 l_i_reserved1;
316 } linux1;
317 struct {
318 __le32 h_i_translator;
319 } hurd1;
320 struct {
321 __le32 m_i_reserved1;
322 } masix1;
323 } osd1; /* OS dependent 1 */
324 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
325 __le32 i_generation; /* File version (for NFS) */
326 __le32 i_file_acl; /* File ACL */
327 __le32 i_dir_acl; /* Directory ACL */
328 __le32 i_faddr; /* Fragment address */
329 union {
330 struct {
331 __u8 l_i_frag; /* Fragment number */
332 __u8 l_i_fsize; /* Fragment size */
333 __u16 i_pad1;
334 __le16 l_i_uid_high; /* these 2 fields */
335 __le16 l_i_gid_high; /* were reserved2[0] */
336 __u32 l_i_reserved2;
337 } linux2;
338 struct {
339 __u8 h_i_frag; /* Fragment number */
340 __u8 h_i_fsize; /* Fragment size */
341 __le16 h_i_mode_high;
342 __le16 h_i_uid_high;
343 __le16 h_i_gid_high;
344 __le32 h_i_author;
345 } hurd2;
346 struct {
347 __u8 m_i_frag; /* Fragment number */
348 __u8 m_i_fsize; /* Fragment size */
349 __u16 m_pad1;
350 __u32 m_i_reserved2[2];
351 } masix2;
352 } osd2; /* OS dependent 2 */
353 };
354
355 #define i_size_high i_dir_acl
356
357 #define i_reserved1 osd1.linux1.l_i_reserved1
358 #define i_frag osd2.linux2.l_i_frag
359 #define i_fsize osd2.linux2.l_i_fsize
360 #define i_uid_low i_uid
361 #define i_gid_low i_gid
362 #define i_uid_high osd2.linux2.l_i_uid_high
363 #define i_gid_high osd2.linux2.l_i_gid_high
364 #define i_reserved2 osd2.linux2.l_i_reserved2
365
366 /*
367 * File system states
368 */
369 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
370 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
371 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
372
373 /*
374 * Mount flags
375 */
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 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
392
393
394 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
395 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
396 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
397 EXT2_MOUNT_##opt)
398 /*
399 * Maximal mount counts between two filesystem checks
400 */
401 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
402 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
403
404 /*
405 * Behaviour when detecting errors
406 */
407 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
408 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
409 #define EXT2_ERRORS_PANIC 3 /* Panic */
410 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
411
412 /*
413 * Structure of the super block
414 */
415 struct ext2_super_block {
416 __le32 s_inodes_count; /* Inodes count */
417 __le32 s_blocks_count; /* Blocks count */
418 __le32 s_r_blocks_count; /* Reserved blocks count */
419 __le32 s_free_blocks_count; /* Free blocks count */
420 __le32 s_free_inodes_count; /* Free inodes count */
421 __le32 s_first_data_block; /* First Data Block */
422 __le32 s_log_block_size; /* Block size */
423 __le32 s_log_frag_size; /* Fragment size */
424 __le32 s_blocks_per_group; /* # Blocks per group */
425 __le32 s_frags_per_group; /* # Fragments per group */
426 __le32 s_inodes_per_group; /* # Inodes per group */
427 __le32 s_mtime; /* Mount time */
428 __le32 s_wtime; /* Write time */
429 __le16 s_mnt_count; /* Mount count */
430 __le16 s_max_mnt_count; /* Maximal mount count */
431 __le16 s_magic; /* Magic signature */
432 __le16 s_state; /* File system state */
433 __le16 s_errors; /* Behaviour when detecting errors */
434 __le16 s_minor_rev_level; /* minor revision level */
435 __le32 s_lastcheck; /* time of last check */
436 __le32 s_checkinterval; /* max. time between checks */
437 __le32 s_creator_os; /* OS */
438 __le32 s_rev_level; /* Revision level */
439 __le16 s_def_resuid; /* Default uid for reserved blocks */
440 __le16 s_def_resgid; /* Default gid for reserved blocks */
441 /*
442 * These fields are for EXT2_DYNAMIC_REV superblocks only.
443 *
444 * Note: the difference between the compatible feature set and
445 * the incompatible feature set is that if there is a bit set
446 * in the incompatible feature set that the kernel doesn't
447 * know about, it should refuse to mount the filesystem.
448 *
449 * e2fsck's requirements are more strict; if it doesn't know
450 * about a feature in either the compatible or incompatible
451 * feature set, it must abort and not try to meddle with
452 * things it doesn't understand...
453 */
454 __le32 s_first_ino; /* First non-reserved inode */
455 __le16 s_inode_size; /* size of inode structure */
456 __le16 s_block_group_nr; /* block group # of this superblock */
457 __le32 s_feature_compat; /* compatible feature set */
458 __le32 s_feature_incompat; /* incompatible feature set */
459 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
460 __u8 s_uuid[16]; /* 128-bit uuid for volume */
461 char s_volume_name[16]; /* volume name */
462 char s_last_mounted[64]; /* directory where last mounted */
463 __le32 s_algorithm_usage_bitmap; /* For compression */
464 /*
465 * Performance hints. Directory preallocation should only
466 * happen if the EXT2_COMPAT_PREALLOC flag is on.
467 */
468 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
469 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
470 __u16 s_padding1;
471 /*
472 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
473 */
474 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
475 __u32 s_journal_inum; /* inode number of journal file */
476 __u32 s_journal_dev; /* device number of journal file */
477 __u32 s_last_orphan; /* start of list of inodes to delete */
478 __u32 s_hash_seed[4]; /* HTREE hash seed */
479 __u8 s_def_hash_version; /* Default hash version to use */
480 __u8 s_reserved_char_pad;
481 __u16 s_reserved_word_pad;
482 __le32 s_default_mount_opts;
483 __le32 s_first_meta_bg; /* First metablock block group */
484 __u32 s_reserved[190]; /* Padding to the end of the block */
485 };
486
487 /*
488 * Codes for operating systems
489 */
490 #define EXT2_OS_LINUX 0
491 #define EXT2_OS_HURD 1
492 #define EXT2_OS_MASIX 2
493 #define EXT2_OS_FREEBSD 3
494 #define EXT2_OS_LITES 4
495
496 /*
497 * Revision levels
498 */
499 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
500 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
501
502 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
503 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
504
505 #define EXT2_GOOD_OLD_INODE_SIZE 128
506
507 /*
508 * Feature set definitions
509 */
510
511 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
512 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
513 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
514 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
515 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
516 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
517 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
518 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
519 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
520 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
521 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
522 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
523 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
524 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
525 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
526 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
527 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
528 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
529
530 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
531 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
532 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
533 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
534 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
535 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
536 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
537
538 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
539 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
540 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
541 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
542
543 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
544 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
545 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
546 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
547 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
548 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
549
550 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
551 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
552 EXT2_FEATURE_INCOMPAT_META_BG)
553 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
554 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
555 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
556 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
557 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
558
559 /*
560 * Default values for user and/or group using reserved blocks
561 */
562 #define EXT2_DEF_RESUID 0
563 #define EXT2_DEF_RESGID 0
564
565 /*
566 * Default mount options
567 */
568 #define EXT2_DEFM_DEBUG 0x0001
569 #define EXT2_DEFM_BSDGROUPS 0x0002
570 #define EXT2_DEFM_XATTR_USER 0x0004
571 #define EXT2_DEFM_ACL 0x0008
572 #define EXT2_DEFM_UID16 0x0010
573 /* Not used by ext2, but reserved for use by ext3 */
574 #define EXT3_DEFM_JMODE 0x0060
575 #define EXT3_DEFM_JMODE_DATA 0x0020
576 #define EXT3_DEFM_JMODE_ORDERED 0x0040
577 #define EXT3_DEFM_JMODE_WBACK 0x0060
578
579 /*
580 * Structure of a directory entry
581 */
582
583 struct ext2_dir_entry {
584 __le32 inode; /* Inode number */
585 __le16 rec_len; /* Directory entry length */
586 __le16 name_len; /* Name length */
587 char name[]; /* File name, up to EXT2_NAME_LEN */
588 };
589
590 /*
591 * The new version of the directory entry. Since EXT2 structures are
592 * stored in intel byte order, and the name_len field could never be
593 * bigger than 255 chars, it's safe to reclaim the extra byte for the
594 * file_type field.
595 */
596 struct ext2_dir_entry_2 {
597 __le32 inode; /* Inode number */
598 __le16 rec_len; /* Directory entry length */
599 __u8 name_len; /* Name length */
600 __u8 file_type;
601 char name[]; /* File name, up to EXT2_NAME_LEN */
602 };
603
604 /*
605 * EXT2_DIR_PAD defines the directory entries boundaries
606 *
607 * NOTE: It must be a multiple of 4
608 */
609 #define EXT2_DIR_PAD 4
610 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
611 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
612 ~EXT2_DIR_ROUND)
613 #define EXT2_MAX_REC_LEN ((1<<16)-1)
614
verify_offsets(void)615 static inline void verify_offsets(void)
616 {
617 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
618 A(EXT2_SB_MAGIC_OFFSET, s_magic);
619 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count);
620 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size);
621 #undef A
622 }
623
624 /*
625 * ext2 mount options
626 */
627 struct ext2_mount_options {
628 unsigned long s_mount_opt;
629 kuid_t s_resuid;
630 kgid_t s_resgid;
631 };
632
633 /*
634 * second extended file system inode data in memory
635 */
636 struct ext2_inode_info {
637 __le32 i_data[15];
638 __u32 i_flags;
639 __u32 i_faddr;
640 __u8 i_frag_no;
641 __u8 i_frag_size;
642 __u16 i_state;
643 __u32 i_file_acl;
644 __u32 i_dir_acl;
645 __u32 i_dtime;
646
647 /*
648 * i_block_group is the number of the block group which contains
649 * this file's inode. Constant across the lifetime of the inode,
650 * it is used for making block allocation decisions - we try to
651 * place a file's data blocks near its inode block, and new inodes
652 * near to their parent directory's inode.
653 */
654 __u32 i_block_group;
655
656 /* block reservation info */
657 struct ext2_block_alloc_info *i_block_alloc_info;
658
659 __u32 i_dir_start_lookup;
660 #ifdef CONFIG_EXT2_FS_XATTR
661 /*
662 * Extended attributes can be read independently of the main file
663 * data. Taking i_mutex even when reading would cause contention
664 * between readers of EAs and writers of regular file data, so
665 * instead we synchronize on xattr_sem when reading or changing
666 * EAs.
667 */
668 struct rw_semaphore xattr_sem;
669 #endif
670 rwlock_t i_meta_lock;
671
672 /*
673 * truncate_mutex is for serialising ext2_truncate() against
674 * ext2_getblock(). It also protects the internals of the inode's
675 * reservation data structures: ext2_reserve_window and
676 * ext2_reserve_window_node.
677 */
678 struct mutex truncate_mutex;
679 struct inode vfs_inode;
680 struct list_head i_orphan; /* unlinked but open inodes */
681 #ifdef CONFIG_QUOTA
682 struct dquot *i_dquot[MAXQUOTAS];
683 #endif
684 };
685
686 /*
687 * Inode dynamic state flags
688 */
689 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
690
691
692 /*
693 * Function prototypes
694 */
695
696 /*
697 * Ok, these declarations are also in <linux/kernel.h> but none of the
698 * ext2 source programs needs to include it so they are duplicated here.
699 */
700
EXT2_I(struct inode * inode)701 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
702 {
703 return container_of(inode, struct ext2_inode_info, vfs_inode);
704 }
705
706 /* balloc.c */
707 extern int ext2_bg_has_super(struct super_block *sb, int group);
708 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
709 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
710 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
711 unsigned long *, int *);
712 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
713 unsigned int count);
714 extern void ext2_free_blocks (struct inode *, unsigned long,
715 unsigned long);
716 extern unsigned long ext2_count_free_blocks (struct super_block *);
717 extern unsigned long ext2_count_dirs (struct super_block *);
718 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
719 unsigned int block_group,
720 struct buffer_head ** bh);
721 extern void ext2_discard_reservation (struct inode *);
722 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
723 extern void ext2_init_block_alloc_info(struct inode *);
724 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
725
726 /* dir.c */
727 extern int ext2_add_link (struct dentry *, struct inode *);
728 extern int ext2_inode_by_name(struct inode *dir,
729 const struct qstr *child, ino_t *ino);
730 extern int ext2_make_empty(struct inode *, struct inode *);
731 extern struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *,
732 struct page **, void **res_page_addr);
733 extern int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page,
734 char *kaddr);
735 extern int ext2_empty_dir (struct inode *);
736 extern struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p, void **pa);
737 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, void *,
738 struct inode *, int);
ext2_put_page(struct page * page,void * page_addr)739 static inline void ext2_put_page(struct page *page, void *page_addr)
740 {
741 kunmap_local(page_addr);
742 put_page(page);
743 }
744
745 /* ialloc.c */
746 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);
747 extern void ext2_free_inode (struct inode *);
748 extern unsigned long ext2_count_free_inodes (struct super_block *);
749 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
750
751 /* inode.c */
752 extern struct inode *ext2_iget (struct super_block *, unsigned long);
753 extern int ext2_write_inode (struct inode *, struct writeback_control *);
754 extern void ext2_evict_inode(struct inode *);
755 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
756 extern int ext2_setattr (struct user_namespace *, struct dentry *, struct iattr *);
757 extern int ext2_getattr (struct user_namespace *, const struct path *,
758 struct kstat *, u32, unsigned int);
759 extern void ext2_set_inode_flags(struct inode *inode);
760 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
761 u64 start, u64 len);
762
763 /* ioctl.c */
764 extern int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa);
765 extern int ext2_fileattr_set(struct user_namespace *mnt_userns,
766 struct dentry *dentry, struct fileattr *fa);
767 extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
768 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
769
770 /* namei.c */
771 struct dentry *ext2_get_parent(struct dentry *child);
772
773 /* super.c */
774 extern __printf(3, 4)
775 void ext2_error(struct super_block *, const char *, const char *, ...);
776 extern __printf(3, 4)
777 void ext2_msg(struct super_block *, const char *, const char *, ...);
778 extern void ext2_update_dynamic_rev (struct super_block *sb);
779 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
780 int wait);
781
782 /*
783 * Inodes and files operations
784 */
785
786 /* dir.c */
787 extern const struct file_operations ext2_dir_operations;
788
789 /* file.c */
790 extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
791 int datasync);
792 extern const struct inode_operations ext2_file_inode_operations;
793 extern const struct file_operations ext2_file_operations;
794
795 /* inode.c */
796 extern void ext2_set_file_ops(struct inode *inode);
797 extern const struct address_space_operations ext2_aops;
798 extern const struct iomap_ops ext2_iomap_ops;
799
800 /* namei.c */
801 extern const struct inode_operations ext2_dir_inode_operations;
802 extern const struct inode_operations ext2_special_inode_operations;
803
804 /* symlink.c */
805 extern const struct inode_operations ext2_fast_symlink_inode_operations;
806 extern const struct inode_operations ext2_symlink_inode_operations;
807
808 static inline ext2_fsblk_t
ext2_group_first_block_no(struct super_block * sb,unsigned long group_no)809 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
810 {
811 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
812 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
813 }
814
815 static inline ext2_fsblk_t
ext2_group_last_block_no(struct super_block * sb,unsigned long group_no)816 ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
817 {
818 struct ext2_sb_info *sbi = EXT2_SB(sb);
819
820 if (group_no == sbi->s_groups_count - 1)
821 return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
822 else
823 return ext2_group_first_block_no(sb, group_no) +
824 EXT2_BLOCKS_PER_GROUP(sb) - 1;
825 }
826
827 #define ext2_set_bit __test_and_set_bit_le
828 #define ext2_clear_bit __test_and_clear_bit_le
829 #define ext2_test_bit test_bit_le
830 #define ext2_find_first_zero_bit find_first_zero_bit_le
831 #define ext2_find_next_zero_bit find_next_zero_bit_le
832