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 | u64 s_dax_part_off; |
119 | }; |
120 | |
121 | static inline spinlock_t * |
122 | sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) |
123 | { |
124 | return bgl_lock_ptr(bgl: sbi->s_blockgroup_lock, block_group); |
125 | } |
126 | |
127 | /* |
128 | * Define EXT2FS_DEBUG to produce debug messages |
129 | */ |
130 | #undef EXT2FS_DEBUG |
131 | |
132 | /* |
133 | * Define EXT2_RESERVATION to reserve data blocks for expanding files |
134 | */ |
135 | #define EXT2_DEFAULT_RESERVE_BLOCKS 8 |
136 | /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ |
137 | #define EXT2_MAX_RESERVE_BLOCKS 1027 |
138 | #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 |
139 | /* |
140 | * The second extended file system version |
141 | */ |
142 | #define EXT2FS_DATE "95/08/09" |
143 | #define EXT2FS_VERSION "0.5b" |
144 | |
145 | /* |
146 | * Debug code |
147 | */ |
148 | #ifdef EXT2FS_DEBUG |
149 | # define ext2_debug(f, a...) { \ |
150 | printk ("EXT2-fs DEBUG (%s, %d): %s:", \ |
151 | __FILE__, __LINE__, __func__); \ |
152 | printk (f, ## a); \ |
153 | } |
154 | #else |
155 | # define ext2_debug(f, a...) /**/ |
156 | #endif |
157 | |
158 | /* |
159 | * Special inode numbers |
160 | */ |
161 | #define EXT2_BAD_INO 1 /* Bad blocks inode */ |
162 | #define EXT2_ROOT_INO 2 /* Root inode */ |
163 | #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ |
164 | #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
165 | |
166 | /* First non-reserved inode for old ext2 filesystems */ |
167 | #define EXT2_GOOD_OLD_FIRST_INO 11 |
168 | |
169 | static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) |
170 | { |
171 | return sb->s_fs_info; |
172 | } |
173 | |
174 | /* |
175 | * Macro-instructions used to manage several block sizes |
176 | */ |
177 | #define EXT2_MIN_BLOCK_SIZE 1024 |
178 | #define EXT2_MAX_BLOCK_SIZE 65536 |
179 | #define EXT2_MIN_BLOCK_LOG_SIZE 10 |
180 | #define EXT2_MAX_BLOCK_LOG_SIZE 16 |
181 | #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) |
182 | #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) |
183 | #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
184 | #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) |
185 | #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) |
186 | #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) |
187 | |
188 | /* |
189 | * Structure of a blocks group descriptor |
190 | */ |
191 | struct ext2_group_desc |
192 | { |
193 | __le32 bg_block_bitmap; /* Blocks bitmap block */ |
194 | __le32 bg_inode_bitmap; /* Inodes bitmap block */ |
195 | __le32 bg_inode_table; /* Inodes table block */ |
196 | __le16 bg_free_blocks_count; /* Free blocks count */ |
197 | __le16 bg_free_inodes_count; /* Free inodes count */ |
198 | __le16 bg_used_dirs_count; /* Directories count */ |
199 | __le16 bg_pad; |
200 | __le32 bg_reserved[3]; |
201 | }; |
202 | |
203 | /* |
204 | * Macro-instructions used to manage group descriptors |
205 | */ |
206 | #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) |
207 | #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) |
208 | #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) |
209 | #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) |
210 | |
211 | /* |
212 | * Constants relative to the data blocks |
213 | */ |
214 | #define EXT2_NDIR_BLOCKS 12 |
215 | #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS |
216 | #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) |
217 | #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) |
218 | #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) |
219 | |
220 | /* |
221 | * Inode flags (GETFLAGS/SETFLAGS) |
222 | */ |
223 | #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ |
224 | #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ |
225 | #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ |
226 | #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ |
227 | #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ |
228 | #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ |
229 | #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ |
230 | #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ |
231 | /* Reserved for compression usage... */ |
232 | #define EXT2_DIRTY_FL FS_DIRTY_FL |
233 | #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ |
234 | #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ |
235 | #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ |
236 | /* End compression flags --- maybe not all used */ |
237 | #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ |
238 | #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ |
239 | #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ |
240 | #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ |
241 | #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ |
242 | #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ |
243 | #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ |
244 | #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ |
245 | |
246 | #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ |
247 | #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ |
248 | |
249 | /* Flags that should be inherited by new inodes from their parent. */ |
250 | #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ |
251 | EXT2_SYNC_FL | EXT2_NODUMP_FL |\ |
252 | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ |
253 | EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ |
254 | EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) |
255 | |
256 | /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
257 | #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) |
258 | |
259 | /* Flags that are appropriate for non-directories/regular files. */ |
260 | #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) |
261 | |
262 | /* Mask out flags that are inappropriate for the given type of inode. */ |
263 | static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) |
264 | { |
265 | if (S_ISDIR(mode)) |
266 | return flags; |
267 | else if (S_ISREG(mode)) |
268 | return flags & EXT2_REG_FLMASK; |
269 | else |
270 | return flags & EXT2_OTHER_FLMASK; |
271 | } |
272 | |
273 | /* |
274 | * ioctl commands |
275 | */ |
276 | #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION |
277 | #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION |
278 | #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) |
279 | #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) |
280 | |
281 | /* |
282 | * ioctl commands in 32 bit emulation |
283 | */ |
284 | #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION |
285 | #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION |
286 | |
287 | /* |
288 | * Structure of an inode on the disk |
289 | */ |
290 | struct ext2_inode { |
291 | __le16 i_mode; /* File mode */ |
292 | __le16 i_uid; /* Low 16 bits of Owner Uid */ |
293 | __le32 i_size; /* Size in bytes */ |
294 | __le32 i_atime; /* Access time */ |
295 | __le32 i_ctime; /* Creation time */ |
296 | __le32 i_mtime; /* Modification time */ |
297 | __le32 i_dtime; /* Deletion Time */ |
298 | __le16 i_gid; /* Low 16 bits of Group Id */ |
299 | __le16 i_links_count; /* Links count */ |
300 | __le32 i_blocks; /* Blocks count */ |
301 | __le32 i_flags; /* File flags */ |
302 | union { |
303 | struct { |
304 | __le32 l_i_reserved1; |
305 | } linux1; |
306 | struct { |
307 | __le32 h_i_translator; |
308 | } hurd1; |
309 | struct { |
310 | __le32 m_i_reserved1; |
311 | } masix1; |
312 | } osd1; /* OS dependent 1 */ |
313 | __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ |
314 | __le32 i_generation; /* File version (for NFS) */ |
315 | __le32 i_file_acl; /* File ACL */ |
316 | __le32 i_dir_acl; /* Directory ACL */ |
317 | __le32 i_faddr; /* Fragment address */ |
318 | union { |
319 | struct { |
320 | __u8 l_i_frag; /* Fragment number */ |
321 | __u8 l_i_fsize; /* Fragment size */ |
322 | __u16 i_pad1; |
323 | __le16 l_i_uid_high; /* these 2 fields */ |
324 | __le16 l_i_gid_high; /* were reserved2[0] */ |
325 | __u32 l_i_reserved2; |
326 | } linux2; |
327 | struct { |
328 | __u8 h_i_frag; /* Fragment number */ |
329 | __u8 h_i_fsize; /* Fragment size */ |
330 | __le16 h_i_mode_high; |
331 | __le16 h_i_uid_high; |
332 | __le16 h_i_gid_high; |
333 | __le32 h_i_author; |
334 | } hurd2; |
335 | struct { |
336 | __u8 m_i_frag; /* Fragment number */ |
337 | __u8 m_i_fsize; /* Fragment size */ |
338 | __u16 m_pad1; |
339 | __u32 m_i_reserved2[2]; |
340 | } masix2; |
341 | } osd2; /* OS dependent 2 */ |
342 | }; |
343 | |
344 | #define i_size_high i_dir_acl |
345 | |
346 | #define i_reserved1 osd1.linux1.l_i_reserved1 |
347 | #define i_frag osd2.linux2.l_i_frag |
348 | #define i_fsize osd2.linux2.l_i_fsize |
349 | #define i_uid_low i_uid |
350 | #define i_gid_low i_gid |
351 | #define i_uid_high osd2.linux2.l_i_uid_high |
352 | #define i_gid_high osd2.linux2.l_i_gid_high |
353 | #define i_reserved2 osd2.linux2.l_i_reserved2 |
354 | |
355 | /* |
356 | * File system states |
357 | */ |
358 | #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ |
359 | #define EXT2_ERROR_FS 0x0002 /* Errors detected */ |
360 | #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ |
361 | |
362 | /* |
363 | * Mount flags |
364 | */ |
365 | #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ |
366 | #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ |
367 | #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ |
368 | #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ |
369 | #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ |
370 | #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ |
371 | #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ |
372 | #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ |
373 | #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ |
374 | #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ |
375 | #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ |
376 | #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ |
377 | #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ |
378 | #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ |
379 | #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ |
380 | #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ |
381 | |
382 | |
383 | #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt |
384 | #define set_opt(o, opt) o |= EXT2_MOUNT_##opt |
385 | #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ |
386 | EXT2_MOUNT_##opt) |
387 | /* |
388 | * Maximal mount counts between two filesystem checks |
389 | */ |
390 | #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ |
391 | #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ |
392 | |
393 | /* |
394 | * Behaviour when detecting errors |
395 | */ |
396 | #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ |
397 | #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ |
398 | #define EXT2_ERRORS_PANIC 3 /* Panic */ |
399 | #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE |
400 | |
401 | /* |
402 | * Allocation flags |
403 | */ |
404 | #define EXT2_ALLOC_NORESERVE 0x1 /* Do not use reservation |
405 | * window for allocation */ |
406 | |
407 | /* |
408 | * Structure of the super block |
409 | */ |
410 | struct ext2_super_block { |
411 | __le32 s_inodes_count; /* Inodes count */ |
412 | __le32 s_blocks_count; /* Blocks count */ |
413 | __le32 s_r_blocks_count; /* Reserved blocks count */ |
414 | __le32 s_free_blocks_count; /* Free blocks count */ |
415 | __le32 s_free_inodes_count; /* Free inodes count */ |
416 | __le32 s_first_data_block; /* First Data Block */ |
417 | __le32 s_log_block_size; /* Block size */ |
418 | __le32 s_log_frag_size; /* Fragment size */ |
419 | __le32 s_blocks_per_group; /* # Blocks per group */ |
420 | __le32 s_frags_per_group; /* # Fragments per group */ |
421 | __le32 s_inodes_per_group; /* # Inodes per group */ |
422 | __le32 s_mtime; /* Mount time */ |
423 | __le32 s_wtime; /* Write time */ |
424 | __le16 s_mnt_count; /* Mount count */ |
425 | __le16 s_max_mnt_count; /* Maximal mount count */ |
426 | __le16 s_magic; /* Magic signature */ |
427 | __le16 s_state; /* File system state */ |
428 | __le16 s_errors; /* Behaviour when detecting errors */ |
429 | __le16 s_minor_rev_level; /* minor revision level */ |
430 | __le32 s_lastcheck; /* time of last check */ |
431 | __le32 s_checkinterval; /* max. time between checks */ |
432 | __le32 s_creator_os; /* OS */ |
433 | __le32 s_rev_level; /* Revision level */ |
434 | __le16 s_def_resuid; /* Default uid for reserved blocks */ |
435 | __le16 s_def_resgid; /* Default gid for reserved blocks */ |
436 | /* |
437 | * These fields are for EXT2_DYNAMIC_REV superblocks only. |
438 | * |
439 | * Note: the difference between the compatible feature set and |
440 | * the incompatible feature set is that if there is a bit set |
441 | * in the incompatible feature set that the kernel doesn't |
442 | * know about, it should refuse to mount the filesystem. |
443 | * |
444 | * e2fsck's requirements are more strict; if it doesn't know |
445 | * about a feature in either the compatible or incompatible |
446 | * feature set, it must abort and not try to meddle with |
447 | * things it doesn't understand... |
448 | */ |
449 | __le32 s_first_ino; /* First non-reserved inode */ |
450 | __le16 s_inode_size; /* size of inode structure */ |
451 | __le16 s_block_group_nr; /* block group # of this superblock */ |
452 | __le32 s_feature_compat; /* compatible feature set */ |
453 | __le32 s_feature_incompat; /* incompatible feature set */ |
454 | __le32 s_feature_ro_compat; /* readonly-compatible feature set */ |
455 | __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
456 | char s_volume_name[16]; /* volume name */ |
457 | char s_last_mounted[64]; /* directory where last mounted */ |
458 | __le32 s_algorithm_usage_bitmap; /* For compression */ |
459 | /* |
460 | * Performance hints. Directory preallocation should only |
461 | * happen if the EXT2_COMPAT_PREALLOC flag is on. |
462 | */ |
463 | __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ |
464 | __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ |
465 | __u16 s_padding1; |
466 | /* |
467 | * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. |
468 | */ |
469 | __u8 s_journal_uuid[16]; /* uuid of journal superblock */ |
470 | __u32 s_journal_inum; /* inode number of journal file */ |
471 | __u32 s_journal_dev; /* device number of journal file */ |
472 | __u32 s_last_orphan; /* start of list of inodes to delete */ |
473 | __u32 s_hash_seed[4]; /* HTREE hash seed */ |
474 | __u8 s_def_hash_version; /* Default hash version to use */ |
475 | __u8 s_reserved_char_pad; |
476 | __u16 s_reserved_word_pad; |
477 | __le32 s_default_mount_opts; |
478 | __le32 s_first_meta_bg; /* First metablock block group */ |
479 | __u32 s_reserved[190]; /* Padding to the end of the block */ |
480 | }; |
481 | |
482 | /* |
483 | * Codes for operating systems |
484 | */ |
485 | #define EXT2_OS_LINUX 0 |
486 | #define EXT2_OS_HURD 1 |
487 | #define EXT2_OS_MASIX 2 |
488 | #define EXT2_OS_FREEBSD 3 |
489 | #define EXT2_OS_LITES 4 |
490 | |
491 | /* |
492 | * Revision levels |
493 | */ |
494 | #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ |
495 | #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ |
496 | |
497 | #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV |
498 | #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV |
499 | |
500 | #define EXT2_GOOD_OLD_INODE_SIZE 128 |
501 | |
502 | /* |
503 | * Feature set definitions |
504 | */ |
505 | |
506 | #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ |
507 | ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) |
508 | #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ |
509 | ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) |
510 | #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ |
511 | ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) |
512 | #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ |
513 | EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) |
514 | #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ |
515 | EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) |
516 | #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ |
517 | EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) |
518 | #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ |
519 | EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) |
520 | #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ |
521 | EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) |
522 | #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ |
523 | EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) |
524 | |
525 | #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 |
526 | #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 |
527 | #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 |
528 | #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 |
529 | #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 |
530 | #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 |
531 | #define EXT2_FEATURE_COMPAT_ANY 0xffffffff |
532 | |
533 | #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 |
534 | #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 |
535 | #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 |
536 | #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff |
537 | |
538 | #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 |
539 | #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 |
540 | #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 |
541 | #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 |
542 | #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 |
543 | #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff |
544 | |
545 | #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR |
546 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ |
547 | EXT2_FEATURE_INCOMPAT_META_BG) |
548 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ |
549 | EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ |
550 | EXT2_FEATURE_RO_COMPAT_BTREE_DIR) |
551 | #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP |
552 | #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP |
553 | |
554 | /* |
555 | * Default values for user and/or group using reserved blocks |
556 | */ |
557 | #define EXT2_DEF_RESUID 0 |
558 | #define EXT2_DEF_RESGID 0 |
559 | |
560 | /* |
561 | * Default mount options |
562 | */ |
563 | #define EXT2_DEFM_DEBUG 0x0001 |
564 | #define EXT2_DEFM_BSDGROUPS 0x0002 |
565 | #define EXT2_DEFM_XATTR_USER 0x0004 |
566 | #define EXT2_DEFM_ACL 0x0008 |
567 | #define EXT2_DEFM_UID16 0x0010 |
568 | /* Not used by ext2, but reserved for use by ext3 */ |
569 | #define EXT3_DEFM_JMODE 0x0060 |
570 | #define EXT3_DEFM_JMODE_DATA 0x0020 |
571 | #define EXT3_DEFM_JMODE_ORDERED 0x0040 |
572 | #define EXT3_DEFM_JMODE_WBACK 0x0060 |
573 | |
574 | /* |
575 | * Structure of a directory entry |
576 | */ |
577 | |
578 | struct ext2_dir_entry { |
579 | __le32 inode; /* Inode number */ |
580 | __le16 rec_len; /* Directory entry length */ |
581 | __le16 name_len; /* Name length */ |
582 | char name[]; /* File name, up to EXT2_NAME_LEN */ |
583 | }; |
584 | |
585 | /* |
586 | * The new version of the directory entry. Since EXT2 structures are |
587 | * stored in intel byte order, and the name_len field could never be |
588 | * bigger than 255 chars, it's safe to reclaim the extra byte for the |
589 | * file_type field. |
590 | */ |
591 | struct ext2_dir_entry_2 { |
592 | __le32 inode; /* Inode number */ |
593 | __le16 rec_len; /* Directory entry length */ |
594 | __u8 name_len; /* Name length */ |
595 | __u8 file_type; |
596 | char name[]; /* File name, up to EXT2_NAME_LEN */ |
597 | }; |
598 | |
599 | /* |
600 | * EXT2_DIR_PAD defines the directory entries boundaries |
601 | * |
602 | * NOTE: It must be a multiple of 4 |
603 | */ |
604 | #define EXT2_DIR_PAD 4 |
605 | #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) |
606 | #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ |
607 | ~EXT2_DIR_ROUND) |
608 | #define EXT2_MAX_REC_LEN ((1<<16)-1) |
609 | |
610 | static inline void verify_offsets(void) |
611 | { |
612 | #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); |
613 | A(EXT2_SB_MAGIC_OFFSET, s_magic); |
614 | A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); |
615 | A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); |
616 | #undef A |
617 | } |
618 | |
619 | /* |
620 | * ext2 mount options |
621 | */ |
622 | struct ext2_mount_options { |
623 | unsigned long s_mount_opt; |
624 | kuid_t s_resuid; |
625 | kgid_t s_resgid; |
626 | }; |
627 | |
628 | /* |
629 | * second extended file system inode data in memory |
630 | */ |
631 | struct ext2_inode_info { |
632 | __le32 i_data[15]; |
633 | __u32 i_flags; |
634 | __u32 i_faddr; |
635 | __u8 i_frag_no; |
636 | __u8 i_frag_size; |
637 | __u16 i_state; |
638 | __u32 i_file_acl; |
639 | __u32 i_dir_acl; |
640 | __u32 i_dtime; |
641 | |
642 | /* |
643 | * i_block_group is the number of the block group which contains |
644 | * this file's inode. Constant across the lifetime of the inode, |
645 | * it is used for making block allocation decisions - we try to |
646 | * place a file's data blocks near its inode block, and new inodes |
647 | * near to their parent directory's inode. |
648 | */ |
649 | __u32 i_block_group; |
650 | |
651 | /* block reservation info */ |
652 | struct ext2_block_alloc_info *i_block_alloc_info; |
653 | |
654 | __u32 i_dir_start_lookup; |
655 | #ifdef CONFIG_EXT2_FS_XATTR |
656 | /* |
657 | * Extended attributes can be read independently of the main file |
658 | * data. Taking i_mutex even when reading would cause contention |
659 | * between readers of EAs and writers of regular file data, so |
660 | * instead we synchronize on xattr_sem when reading or changing |
661 | * EAs. |
662 | */ |
663 | struct rw_semaphore xattr_sem; |
664 | #endif |
665 | rwlock_t i_meta_lock; |
666 | |
667 | /* |
668 | * truncate_mutex is for serialising ext2_truncate() against |
669 | * ext2_getblock(). It also protects the internals of the inode's |
670 | * reservation data structures: ext2_reserve_window and |
671 | * ext2_reserve_window_node. |
672 | */ |
673 | struct mutex truncate_mutex; |
674 | struct inode vfs_inode; |
675 | struct list_head i_orphan; /* unlinked but open inodes */ |
676 | #ifdef CONFIG_QUOTA |
677 | struct dquot *i_dquot[MAXQUOTAS]; |
678 | #endif |
679 | }; |
680 | |
681 | /* |
682 | * Inode dynamic state flags |
683 | */ |
684 | #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ |
685 | |
686 | |
687 | /* |
688 | * Function prototypes |
689 | */ |
690 | |
691 | /* |
692 | * Ok, these declarations are also in <linux/kernel.h> but none of the |
693 | * ext2 source programs needs to include it so they are duplicated here. |
694 | */ |
695 | |
696 | static inline struct ext2_inode_info *EXT2_I(struct inode *inode) |
697 | { |
698 | return container_of(inode, struct ext2_inode_info, vfs_inode); |
699 | } |
700 | |
701 | /* balloc.c */ |
702 | extern int ext2_bg_has_super(struct super_block *sb, int group); |
703 | extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); |
704 | extern ext2_fsblk_t ext2_new_blocks(struct inode *, ext2_fsblk_t, |
705 | unsigned long *, int *, unsigned int); |
706 | extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, |
707 | unsigned int count); |
708 | extern void ext2_free_blocks(struct inode *, ext2_fsblk_t, unsigned long); |
709 | extern unsigned long ext2_count_free_blocks (struct super_block *); |
710 | extern unsigned long ext2_count_dirs (struct super_block *); |
711 | extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, |
712 | unsigned int block_group, |
713 | struct buffer_head ** bh); |
714 | extern void ext2_discard_reservation (struct inode *); |
715 | extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); |
716 | extern void ext2_init_block_alloc_info(struct inode *); |
717 | extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); |
718 | |
719 | /* dir.c */ |
720 | int ext2_add_link(struct dentry *, struct inode *); |
721 | int ext2_inode_by_name(struct inode *dir, |
722 | const struct qstr *child, ino_t *ino); |
723 | int ext2_make_empty(struct inode *, struct inode *); |
724 | struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *, |
725 | struct folio **foliop); |
726 | int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct folio *folio); |
727 | int ext2_empty_dir(struct inode *); |
728 | struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct folio **foliop); |
729 | int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de, |
730 | struct folio *folio, struct inode *inode, bool update_times); |
731 | |
732 | /* ialloc.c */ |
733 | extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); |
734 | extern void ext2_free_inode (struct inode *); |
735 | extern unsigned long ext2_count_free_inodes (struct super_block *); |
736 | extern unsigned long ext2_count_free (struct buffer_head *, unsigned); |
737 | |
738 | /* inode.c */ |
739 | extern struct inode *ext2_iget (struct super_block *, unsigned long); |
740 | extern int ext2_write_inode (struct inode *, struct writeback_control *); |
741 | extern void ext2_evict_inode(struct inode *); |
742 | void ext2_write_failed(struct address_space *mapping, loff_t to); |
743 | extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); |
744 | extern int ext2_setattr (struct mnt_idmap *, struct dentry *, struct iattr *); |
745 | extern int ext2_getattr (struct mnt_idmap *, 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 mnt_idmap *idmap, |
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 iomap_ops ext2_iomap_ops; |
787 | |
788 | /* namei.c */ |
789 | extern const struct inode_operations ext2_dir_inode_operations; |
790 | extern const struct inode_operations ext2_special_inode_operations; |
791 | |
792 | /* symlink.c */ |
793 | extern const struct inode_operations ext2_fast_symlink_inode_operations; |
794 | extern const struct inode_operations ext2_symlink_inode_operations; |
795 | |
796 | static inline ext2_fsblk_t |
797 | ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) |
798 | { |
799 | return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + |
800 | le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); |
801 | } |
802 | |
803 | static inline ext2_fsblk_t |
804 | ext2_group_last_block_no(struct super_block *sb, unsigned long group_no) |
805 | { |
806 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
807 | |
808 | if (group_no == sbi->s_groups_count - 1) |
809 | return le32_to_cpu(sbi->s_es->s_blocks_count) - 1; |
810 | else |
811 | return ext2_group_first_block_no(sb, group_no) + |
812 | EXT2_BLOCKS_PER_GROUP(sb) - 1; |
813 | } |
814 | |
815 | #define ext2_set_bit __test_and_set_bit_le |
816 | #define ext2_clear_bit __test_and_clear_bit_le |
817 | #define ext2_test_bit test_bit_le |
818 | #define ext2_find_first_zero_bit find_first_zero_bit_le |
819 | #define ext2_find_next_zero_bit find_next_zero_bit_le |
820 | |