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_inodes_per_block;/* Number of inodes per block */
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_ea_block_cache;
117 struct dax_device *s_daxdev;
118 };
119
120 static inline spinlock_t *
sb_bgl_lock(struct ext2_sb_info * sbi,unsigned int block_group)121 sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
122 {
123 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
124 }
125
126 /*
127 * Define EXT2FS_DEBUG to produce debug messages
128 */
129 #undef EXT2FS_DEBUG
130
131 /*
132 * Define EXT2_RESERVATION to reserve data blocks for expanding files
133 */
134 #define EXT2_DEFAULT_RESERVE_BLOCKS 8
135 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
136 #define EXT2_MAX_RESERVE_BLOCKS 1027
137 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
138 /*
139 * The second extended file system version
140 */
141 #define EXT2FS_DATE "95/08/09"
142 #define EXT2FS_VERSION "0.5b"
143
144 /*
145 * Debug code
146 */
147 #ifdef EXT2FS_DEBUG
148 # define ext2_debug(f, a...) { \
149 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
150 __FILE__, __LINE__, __func__); \
151 printk (f, ## a); \
152 }
153 #else
154 # define ext2_debug(f, a...) /**/
155 #endif
156
157 /*
158 * Special inode numbers
159 */
160 #define EXT2_BAD_INO 1 /* Bad blocks inode */
161 #define EXT2_ROOT_INO 2 /* Root inode */
162 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
163 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
164
165 /* First non-reserved inode for old ext2 filesystems */
166 #define EXT2_GOOD_OLD_FIRST_INO 11
167
EXT2_SB(struct super_block * sb)168 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
169 {
170 return sb->s_fs_info;
171 }
172
173 /*
174 * Macro-instructions used to manage several block sizes
175 */
176 #define EXT2_MIN_BLOCK_SIZE 1024
177 #define EXT2_MAX_BLOCK_SIZE 4096
178 #define EXT2_MIN_BLOCK_LOG_SIZE 10
179 #define EXT2_MAX_BLOCK_LOG_SIZE 16
180 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
181 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
182 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
183 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
184 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
185 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
186
187 /*
188 * Structure of a blocks group descriptor
189 */
190 struct ext2_group_desc
191 {
192 __le32 bg_block_bitmap; /* Blocks bitmap block */
193 __le32 bg_inode_bitmap; /* Inodes bitmap block */
194 __le32 bg_inode_table; /* Inodes table block */
195 __le16 bg_free_blocks_count; /* Free blocks count */
196 __le16 bg_free_inodes_count; /* Free inodes count */
197 __le16 bg_used_dirs_count; /* Directories count */
198 __le16 bg_pad;
199 __le32 bg_reserved[3];
200 };
201
202 /*
203 * Macro-instructions used to manage group descriptors
204 */
205 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
206 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
207 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
208 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
209
210 /*
211 * Constants relative to the data blocks
212 */
213 #define EXT2_NDIR_BLOCKS 12
214 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
215 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
216 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
217 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
218
219 /*
220 * Inode flags (GETFLAGS/SETFLAGS)
221 */
222 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
223 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
224 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
225 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
226 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
227 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
228 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
229 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
230 /* Reserved for compression usage... */
231 #define EXT2_DIRTY_FL FS_DIRTY_FL
232 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
233 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
234 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
235 /* End compression flags --- maybe not all used */
236 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
237 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
238 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
239 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
240 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
241 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
242 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
243 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
244
245 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
246 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
247
248 /* Flags that should be inherited by new inodes from their parent. */
249 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
250 EXT2_SYNC_FL | EXT2_NODUMP_FL |\
251 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
252 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
253 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
254
255 /* Flags that are appropriate for regular files (all but dir-specific ones). */
256 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
257
258 /* Flags that are appropriate for non-directories/regular files. */
259 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
260
261 /* Mask out flags that are inappropriate for the given type of inode. */
ext2_mask_flags(umode_t mode,__u32 flags)262 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
263 {
264 if (S_ISDIR(mode))
265 return flags;
266 else if (S_ISREG(mode))
267 return flags & EXT2_REG_FLMASK;
268 else
269 return flags & EXT2_OTHER_FLMASK;
270 }
271
272 /*
273 * ioctl commands
274 */
275 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
276 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
277 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
278 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
279
280 /*
281 * ioctl commands in 32 bit emulation
282 */
283 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
284 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
285
286 /*
287 * Structure of an inode on the disk
288 */
289 struct ext2_inode {
290 __le16 i_mode; /* File mode */
291 __le16 i_uid; /* Low 16 bits of Owner Uid */
292 __le32 i_size; /* Size in bytes */
293 __le32 i_atime; /* Access time */
294 __le32 i_ctime; /* Creation time */
295 __le32 i_mtime; /* Modification time */
296 __le32 i_dtime; /* Deletion Time */
297 __le16 i_gid; /* Low 16 bits of Group Id */
298 __le16 i_links_count; /* Links count */
299 __le32 i_blocks; /* Blocks count */
300 __le32 i_flags; /* File flags */
301 union {
302 struct {
303 __le32 l_i_reserved1;
304 } linux1;
305 struct {
306 __le32 h_i_translator;
307 } hurd1;
308 struct {
309 __le32 m_i_reserved1;
310 } masix1;
311 } osd1; /* OS dependent 1 */
312 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
313 __le32 i_generation; /* File version (for NFS) */
314 __le32 i_file_acl; /* File ACL */
315 __le32 i_dir_acl; /* Directory ACL */
316 __le32 i_faddr; /* Fragment address */
317 union {
318 struct {
319 __u8 l_i_frag; /* Fragment number */
320 __u8 l_i_fsize; /* Fragment size */
321 __u16 i_pad1;
322 __le16 l_i_uid_high; /* these 2 fields */
323 __le16 l_i_gid_high; /* were reserved2[0] */
324 __u32 l_i_reserved2;
325 } linux2;
326 struct {
327 __u8 h_i_frag; /* Fragment number */
328 __u8 h_i_fsize; /* Fragment size */
329 __le16 h_i_mode_high;
330 __le16 h_i_uid_high;
331 __le16 h_i_gid_high;
332 __le32 h_i_author;
333 } hurd2;
334 struct {
335 __u8 m_i_frag; /* Fragment number */
336 __u8 m_i_fsize; /* Fragment size */
337 __u16 m_pad1;
338 __u32 m_i_reserved2[2];
339 } masix2;
340 } osd2; /* OS dependent 2 */
341 };
342
343 #define i_size_high i_dir_acl
344
345 #define i_reserved1 osd1.linux1.l_i_reserved1
346 #define i_frag osd2.linux2.l_i_frag
347 #define i_fsize osd2.linux2.l_i_fsize
348 #define i_uid_low i_uid
349 #define i_gid_low i_gid
350 #define i_uid_high osd2.linux2.l_i_uid_high
351 #define i_gid_high osd2.linux2.l_i_gid_high
352 #define i_reserved2 osd2.linux2.l_i_reserved2
353
354 /*
355 * File system states
356 */
357 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
358 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
359 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
360
361 /*
362 * Mount flags
363 */
364 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
365 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
366 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
367 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
368 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
369 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
370 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
371 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
372 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
373 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
374 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
375 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
376 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
377 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
378 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
379 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
380
381
382 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
383 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
384 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
385 EXT2_MOUNT_##opt)
386 /*
387 * Maximal mount counts between two filesystem checks
388 */
389 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
390 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
391
392 /*
393 * Behaviour when detecting errors
394 */
395 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
396 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
397 #define EXT2_ERRORS_PANIC 3 /* Panic */
398 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
399
400 /*
401 * Structure of the super block
402 */
403 struct ext2_super_block {
404 __le32 s_inodes_count; /* Inodes count */
405 __le32 s_blocks_count; /* Blocks count */
406 __le32 s_r_blocks_count; /* Reserved blocks count */
407 __le32 s_free_blocks_count; /* Free blocks count */
408 __le32 s_free_inodes_count; /* Free inodes count */
409 __le32 s_first_data_block; /* First Data Block */
410 __le32 s_log_block_size; /* Block size */
411 __le32 s_log_frag_size; /* Fragment size */
412 __le32 s_blocks_per_group; /* # Blocks per group */
413 __le32 s_frags_per_group; /* # Fragments per group */
414 __le32 s_inodes_per_group; /* # Inodes per group */
415 __le32 s_mtime; /* Mount time */
416 __le32 s_wtime; /* Write time */
417 __le16 s_mnt_count; /* Mount count */
418 __le16 s_max_mnt_count; /* Maximal mount count */
419 __le16 s_magic; /* Magic signature */
420 __le16 s_state; /* File system state */
421 __le16 s_errors; /* Behaviour when detecting errors */
422 __le16 s_minor_rev_level; /* minor revision level */
423 __le32 s_lastcheck; /* time of last check */
424 __le32 s_checkinterval; /* max. time between checks */
425 __le32 s_creator_os; /* OS */
426 __le32 s_rev_level; /* Revision level */
427 __le16 s_def_resuid; /* Default uid for reserved blocks */
428 __le16 s_def_resgid; /* Default gid for reserved blocks */
429 /*
430 * These fields are for EXT2_DYNAMIC_REV superblocks only.
431 *
432 * Note: the difference between the compatible feature set and
433 * the incompatible feature set is that if there is a bit set
434 * in the incompatible feature set that the kernel doesn't
435 * know about, it should refuse to mount the filesystem.
436 *
437 * e2fsck's requirements are more strict; if it doesn't know
438 * about a feature in either the compatible or incompatible
439 * feature set, it must abort and not try to meddle with
440 * things it doesn't understand...
441 */
442 __le32 s_first_ino; /* First non-reserved inode */
443 __le16 s_inode_size; /* size of inode structure */
444 __le16 s_block_group_nr; /* block group # of this superblock */
445 __le32 s_feature_compat; /* compatible feature set */
446 __le32 s_feature_incompat; /* incompatible feature set */
447 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
448 __u8 s_uuid[16]; /* 128-bit uuid for volume */
449 char s_volume_name[16]; /* volume name */
450 char s_last_mounted[64]; /* directory where last mounted */
451 __le32 s_algorithm_usage_bitmap; /* For compression */
452 /*
453 * Performance hints. Directory preallocation should only
454 * happen if the EXT2_COMPAT_PREALLOC flag is on.
455 */
456 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
457 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
458 __u16 s_padding1;
459 /*
460 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
461 */
462 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
463 __u32 s_journal_inum; /* inode number of journal file */
464 __u32 s_journal_dev; /* device number of journal file */
465 __u32 s_last_orphan; /* start of list of inodes to delete */
466 __u32 s_hash_seed[4]; /* HTREE hash seed */
467 __u8 s_def_hash_version; /* Default hash version to use */
468 __u8 s_reserved_char_pad;
469 __u16 s_reserved_word_pad;
470 __le32 s_default_mount_opts;
471 __le32 s_first_meta_bg; /* First metablock block group */
472 __u32 s_reserved[190]; /* Padding to the end of the block */
473 };
474
475 /*
476 * Codes for operating systems
477 */
478 #define EXT2_OS_LINUX 0
479 #define EXT2_OS_HURD 1
480 #define EXT2_OS_MASIX 2
481 #define EXT2_OS_FREEBSD 3
482 #define EXT2_OS_LITES 4
483
484 /*
485 * Revision levels
486 */
487 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
488 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
489
490 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
491 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
492
493 #define EXT2_GOOD_OLD_INODE_SIZE 128
494
495 /*
496 * Feature set definitions
497 */
498
499 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
500 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
501 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
502 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
503 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
504 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
505 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
506 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
507 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
508 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
509 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
510 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
511 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
512 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
513 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
514 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
515 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
516 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
517
518 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
519 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
520 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
521 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
522 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
523 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
524 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
525
526 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
527 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
528 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
529 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
530
531 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
532 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
533 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
534 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
535 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
536 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
537
538 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
539 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
540 EXT2_FEATURE_INCOMPAT_META_BG)
541 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
542 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
543 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
544 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
545 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
546
547 /*
548 * Default values for user and/or group using reserved blocks
549 */
550 #define EXT2_DEF_RESUID 0
551 #define EXT2_DEF_RESGID 0
552
553 /*
554 * Default mount options
555 */
556 #define EXT2_DEFM_DEBUG 0x0001
557 #define EXT2_DEFM_BSDGROUPS 0x0002
558 #define EXT2_DEFM_XATTR_USER 0x0004
559 #define EXT2_DEFM_ACL 0x0008
560 #define EXT2_DEFM_UID16 0x0010
561 /* Not used by ext2, but reserved for use by ext3 */
562 #define EXT3_DEFM_JMODE 0x0060
563 #define EXT3_DEFM_JMODE_DATA 0x0020
564 #define EXT3_DEFM_JMODE_ORDERED 0x0040
565 #define EXT3_DEFM_JMODE_WBACK 0x0060
566
567 /*
568 * Structure of a directory entry
569 */
570
571 struct ext2_dir_entry {
572 __le32 inode; /* Inode number */
573 __le16 rec_len; /* Directory entry length */
574 __le16 name_len; /* Name length */
575 char name[]; /* File name, up to EXT2_NAME_LEN */
576 };
577
578 /*
579 * The new version of the directory entry. Since EXT2 structures are
580 * stored in intel byte order, and the name_len field could never be
581 * bigger than 255 chars, it's safe to reclaim the extra byte for the
582 * file_type field.
583 */
584 struct ext2_dir_entry_2 {
585 __le32 inode; /* Inode number */
586 __le16 rec_len; /* Directory entry length */
587 __u8 name_len; /* Name length */
588 __u8 file_type;
589 char name[]; /* File name, up to EXT2_NAME_LEN */
590 };
591
592 /*
593 * EXT2_DIR_PAD defines the directory entries boundaries
594 *
595 * NOTE: It must be a multiple of 4
596 */
597 #define EXT2_DIR_PAD 4
598 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
599 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
600 ~EXT2_DIR_ROUND)
601 #define EXT2_MAX_REC_LEN ((1<<16)-1)
602
verify_offsets(void)603 static inline void verify_offsets(void)
604 {
605 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
606 A(EXT2_SB_MAGIC_OFFSET, s_magic);
607 A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count);
608 A(EXT2_SB_BSIZE_OFFSET, s_log_block_size);
609 #undef A
610 }
611
612 /*
613 * ext2 mount options
614 */
615 struct ext2_mount_options {
616 unsigned long s_mount_opt;
617 kuid_t s_resuid;
618 kgid_t s_resgid;
619 };
620
621 /*
622 * second extended file system inode data in memory
623 */
624 struct ext2_inode_info {
625 __le32 i_data[15];
626 __u32 i_flags;
627 __u32 i_faddr;
628 __u8 i_frag_no;
629 __u8 i_frag_size;
630 __u16 i_state;
631 __u32 i_file_acl;
632 __u32 i_dir_acl;
633 __u32 i_dtime;
634
635 /*
636 * i_block_group is the number of the block group which contains
637 * this file's inode. Constant across the lifetime of the inode,
638 * it is used for making block allocation decisions - we try to
639 * place a file's data blocks near its inode block, and new inodes
640 * near to their parent directory's inode.
641 */
642 __u32 i_block_group;
643
644 /* block reservation info */
645 struct ext2_block_alloc_info *i_block_alloc_info;
646
647 __u32 i_dir_start_lookup;
648 #ifdef CONFIG_EXT2_FS_XATTR
649 /*
650 * Extended attributes can be read independently of the main file
651 * data. Taking i_mutex even when reading would cause contention
652 * between readers of EAs and writers of regular file data, so
653 * instead we synchronize on xattr_sem when reading or changing
654 * EAs.
655 */
656 struct rw_semaphore xattr_sem;
657 #endif
658 rwlock_t i_meta_lock;
659
660 /*
661 * truncate_mutex is for serialising ext2_truncate() against
662 * ext2_getblock(). It also protects the internals of the inode's
663 * reservation data structures: ext2_reserve_window and
664 * ext2_reserve_window_node.
665 */
666 struct mutex truncate_mutex;
667 struct inode vfs_inode;
668 struct list_head i_orphan; /* unlinked but open inodes */
669 #ifdef CONFIG_QUOTA
670 struct dquot *i_dquot[MAXQUOTAS];
671 #endif
672 };
673
674 /*
675 * Inode dynamic state flags
676 */
677 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
678
679
680 /*
681 * Function prototypes
682 */
683
684 /*
685 * Ok, these declarations are also in <linux/kernel.h> but none of the
686 * ext2 source programs needs to include it so they are duplicated here.
687 */
688
EXT2_I(struct inode * inode)689 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
690 {
691 return container_of(inode, struct ext2_inode_info, vfs_inode);
692 }
693
694 /* balloc.c */
695 extern int ext2_bg_has_super(struct super_block *sb, int group);
696 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
697 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
698 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
699 unsigned long *, int *);
700 extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk,
701 unsigned int count);
702 extern void ext2_free_blocks (struct inode *, unsigned long,
703 unsigned long);
704 extern unsigned long ext2_count_free_blocks (struct super_block *);
705 extern unsigned long ext2_count_dirs (struct super_block *);
706 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
707 unsigned int block_group,
708 struct buffer_head ** bh);
709 extern void ext2_discard_reservation (struct inode *);
710 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
711 extern void ext2_init_block_alloc_info(struct inode *);
712 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
713
714 /* dir.c */
715 extern int ext2_add_link (struct dentry *, struct inode *);
716 extern int ext2_inode_by_name(struct inode *dir,
717 const struct qstr *child, ino_t *ino);
718 extern int ext2_make_empty(struct inode *, struct inode *);
719 extern struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *,
720 struct page **, void **res_page_addr);
721 extern int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page,
722 char *kaddr);
723 extern int ext2_empty_dir (struct inode *);
724 extern struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p, void **pa);
725 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, void *,
726 struct inode *, int);
ext2_put_page(struct page * page,void * page_addr)727 static inline void ext2_put_page(struct page *page, void *page_addr)
728 {
729 kunmap_local(page_addr);
730 put_page(page);
731 }
732
733 /* ialloc.c */
734 extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);
735 extern void ext2_free_inode (struct inode *);
736 extern unsigned long ext2_count_free_inodes (struct super_block *);
737 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
738
739 /* inode.c */
740 extern struct inode *ext2_iget (struct super_block *, unsigned long);
741 extern int ext2_write_inode (struct inode *, struct writeback_control *);
742 extern void ext2_evict_inode(struct inode *);
743 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
744 extern int ext2_setattr (struct user_namespace *, struct dentry *, struct iattr *);
745 extern int ext2_getattr (struct user_namespace *, const struct path *,
746 struct kstat *, u32, unsigned int);
747 extern void ext2_set_inode_flags(struct inode *inode);
748 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
749 u64 start, u64 len);
750
751 /* ioctl.c */
752 extern int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa);
753 extern int ext2_fileattr_set(struct user_namespace *mnt_userns,
754 struct dentry *dentry, struct fileattr *fa);
755 extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
756 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
757
758 /* namei.c */
759 struct dentry *ext2_get_parent(struct dentry *child);
760
761 /* super.c */
762 extern __printf(3, 4)
763 void ext2_error(struct super_block *, const char *, const char *, ...);
764 extern __printf(3, 4)
765 void ext2_msg(struct super_block *, const char *, const char *, ...);
766 extern void ext2_update_dynamic_rev (struct super_block *sb);
767 extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
768 int wait);
769
770 /*
771 * Inodes and files operations
772 */
773
774 /* dir.c */
775 extern const struct file_operations ext2_dir_operations;
776
777 /* file.c */
778 extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
779 int datasync);
780 extern const struct inode_operations ext2_file_inode_operations;
781 extern const struct file_operations ext2_file_operations;
782
783 /* inode.c */
784 extern void ext2_set_file_ops(struct inode *inode);
785 extern const struct address_space_operations ext2_aops;
786 extern const struct address_space_operations ext2_nobh_aops;
787 extern const struct iomap_ops ext2_iomap_ops;
788
789 /* namei.c */
790 extern const struct inode_operations ext2_dir_inode_operations;
791 extern const struct inode_operations ext2_special_inode_operations;
792
793 /* symlink.c */
794 extern const struct inode_operations ext2_fast_symlink_inode_operations;
795 extern const struct inode_operations ext2_symlink_inode_operations;
796
797 static inline ext2_fsblk_t
ext2_group_first_block_no(struct super_block * sb,unsigned long group_no)798 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
799 {
800 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
801 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
802 }
803
804 static inline ext2_fsblk_t
ext2_group_last_block_no(struct super_block * sb,unsigned long group_no)805 ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
806 {
807 struct ext2_sb_info *sbi = EXT2_SB(sb);
808
809 if (group_no == sbi->s_groups_count - 1)
810 return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
811 else
812 return ext2_group_first_block_no(sb, group_no) +
813 EXT2_BLOCKS_PER_GROUP(sb) - 1;
814 }
815
816 #define ext2_set_bit __test_and_set_bit_le
817 #define ext2_clear_bit __test_and_clear_bit_le
818 #define ext2_test_bit test_bit_le
819 #define ext2_find_first_zero_bit find_first_zero_bit_le
820 #define ext2_find_next_zero_bit find_next_zero_bit_le
821