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1 : : /*
2 : : * Copyright (C) 1992, 1993, 1994, 1995
3 : : * Remy Card (card@masi.ibp.fr)
4 : : * Laboratoire MASI - Institut Blaise Pascal
5 : : * Universite Pierre et Marie Curie (Paris VI)
6 : : *
7 : : * from
8 : : *
9 : : * linux/include/linux/minix_fs.h
10 : : *
11 : : * Copyright (C) 1991, 1992 Linus Torvalds
12 : : */
13 : : #include <linux/fs.h>
14 : : #include <linux/ext2_fs.h>
15 : : #include <linux/blockgroup_lock.h>
16 : : #include <linux/percpu_counter.h>
17 : : #include <linux/rbtree.h>
18 : :
19 : : /* XXX Here for now... not interested in restructing headers JUST now */
20 : :
21 : : /* data type for block offset of block group */
22 : : typedef int ext2_grpblk_t;
23 : :
24 : : /* data type for filesystem-wide blocks number */
25 : : typedef unsigned long ext2_fsblk_t;
26 : :
27 : : #define E2FSBLK "%lu"
28 : :
29 : : struct ext2_reserve_window {
30 : : ext2_fsblk_t _rsv_start; /* First byte reserved */
31 : : ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */
32 : : };
33 : :
34 : : struct ext2_reserve_window_node {
35 : : struct rb_node rsv_node;
36 : : __u32 rsv_goal_size;
37 : : __u32 rsv_alloc_hit;
38 : : struct ext2_reserve_window rsv_window;
39 : : };
40 : :
41 : : struct ext2_block_alloc_info {
42 : : /* information about reservation window */
43 : : struct ext2_reserve_window_node rsv_window_node;
44 : : /*
45 : : * was i_next_alloc_block in ext2_inode_info
46 : : * is the logical (file-relative) number of the
47 : : * most-recently-allocated block in this file.
48 : : * We use this for detecting linearly ascending allocation requests.
49 : : */
50 : : __u32 last_alloc_logical_block;
51 : : /*
52 : : * Was i_next_alloc_goal in ext2_inode_info
53 : : * is the *physical* companion to i_next_alloc_block.
54 : : * it the the physical block number of the block which was most-recentl
55 : : * allocated to this file. This give us the goal (target) for the next
56 : : * allocation when we detect linearly ascending requests.
57 : : */
58 : : ext2_fsblk_t last_alloc_physical_block;
59 : : };
60 : :
61 : : #define rsv_start rsv_window._rsv_start
62 : : #define rsv_end rsv_window._rsv_end
63 : :
64 : : /*
65 : : * second extended-fs super-block data in memory
66 : : */
67 : : struct ext2_sb_info {
68 : : unsigned long s_frag_size; /* Size of a fragment in bytes */
69 : : unsigned long s_frags_per_block;/* Number of fragments per block */
70 : : unsigned long s_inodes_per_block;/* Number of inodes per block */
71 : : unsigned long s_frags_per_group;/* Number of fragments in a group */
72 : : unsigned long s_blocks_per_group;/* Number of blocks in a group */
73 : : unsigned long s_inodes_per_group;/* Number of inodes in a group */
74 : : unsigned long s_itb_per_group; /* Number of inode table blocks per group */
75 : : unsigned long s_gdb_count; /* Number of group descriptor blocks */
76 : : unsigned long s_desc_per_block; /* Number of group descriptors per block */
77 : : unsigned long s_groups_count; /* Number of groups in the fs */
78 : : unsigned long s_overhead_last; /* Last calculated overhead */
79 : : unsigned long s_blocks_last; /* Last seen block count */
80 : : struct buffer_head * s_sbh; /* Buffer containing the super block */
81 : : struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
82 : : struct buffer_head ** s_group_desc;
83 : : unsigned long s_mount_opt;
84 : : unsigned long s_sb_block;
85 : : kuid_t s_resuid;
86 : : kgid_t s_resgid;
87 : : unsigned short s_mount_state;
88 : : unsigned short s_pad;
89 : : int s_addr_per_block_bits;
90 : : int s_desc_per_block_bits;
91 : : int s_inode_size;
92 : : int s_first_ino;
93 : : spinlock_t s_next_gen_lock;
94 : : u32 s_next_generation;
95 : : unsigned long s_dir_count;
96 : : u8 *s_debts;
97 : : struct percpu_counter s_freeblocks_counter;
98 : : struct percpu_counter s_freeinodes_counter;
99 : : struct percpu_counter s_dirs_counter;
100 : : struct blockgroup_lock *s_blockgroup_lock;
101 : : /* root of the per fs reservation window tree */
102 : : spinlock_t s_rsv_window_lock;
103 : : struct rb_root s_rsv_window_root;
104 : : struct ext2_reserve_window_node s_rsv_window_head;
105 : : /*
106 : : * s_lock protects against concurrent modifications of s_mount_state,
107 : : * s_blocks_last, s_overhead_last and the content of superblock's
108 : : * buffer pointed to by sbi->s_es.
109 : : *
110 : : * Note: It is used in ext2_show_options() to provide a consistent view
111 : : * of the mount options.
112 : : */
113 : : spinlock_t s_lock;
114 : : };
115 : :
116 : : static inline spinlock_t *
117 : : sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
118 : : {
119 : : return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
120 : : }
121 : :
122 : : /*
123 : : * Define EXT2FS_DEBUG to produce debug messages
124 : : */
125 : : #undef EXT2FS_DEBUG
126 : :
127 : : /*
128 : : * Define EXT2_RESERVATION to reserve data blocks for expanding files
129 : : */
130 : : #define EXT2_DEFAULT_RESERVE_BLOCKS 8
131 : : /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
132 : : #define EXT2_MAX_RESERVE_BLOCKS 1027
133 : : #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
134 : : /*
135 : : * The second extended file system version
136 : : */
137 : : #define EXT2FS_DATE "95/08/09"
138 : : #define EXT2FS_VERSION "0.5b"
139 : :
140 : : /*
141 : : * Debug code
142 : : */
143 : : #ifdef EXT2FS_DEBUG
144 : : # define ext2_debug(f, a...) { \
145 : : printk ("EXT2-fs DEBUG (%s, %d): %s:", \
146 : : __FILE__, __LINE__, __func__); \
147 : : printk (f, ## a); \
148 : : }
149 : : #else
150 : : # define ext2_debug(f, a...) /**/
151 : : #endif
152 : :
153 : : /*
154 : : * Special inode numbers
155 : : */
156 : : #define EXT2_BAD_INO 1 /* Bad blocks inode */
157 : : #define EXT2_ROOT_INO 2 /* Root inode */
158 : : #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
159 : : #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
160 : :
161 : : /* First non-reserved inode for old ext2 filesystems */
162 : : #define EXT2_GOOD_OLD_FIRST_INO 11
163 : :
164 : : static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
165 : : {
166 : : return sb->s_fs_info;
167 : : }
168 : :
169 : : /*
170 : : * Macro-instructions used to manage several block sizes
171 : : */
172 : : #define EXT2_MIN_BLOCK_SIZE 1024
173 : : #define EXT2_MAX_BLOCK_SIZE 4096
174 : : #define EXT2_MIN_BLOCK_LOG_SIZE 10
175 : : #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
176 : : #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
177 : : #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
178 : : #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
179 : : #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
180 : : #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
181 : :
182 : : /*
183 : : * Macro-instructions used to manage fragments
184 : : */
185 : : #define EXT2_MIN_FRAG_SIZE 1024
186 : : #define EXT2_MAX_FRAG_SIZE 4096
187 : : #define EXT2_MIN_FRAG_LOG_SIZE 10
188 : : #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
189 : : #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
190 : :
191 : : /*
192 : : * Structure of a blocks group descriptor
193 : : */
194 : : struct ext2_group_desc
195 : : {
196 : : __le32 bg_block_bitmap; /* Blocks bitmap block */
197 : : __le32 bg_inode_bitmap; /* Inodes bitmap block */
198 : : __le32 bg_inode_table; /* Inodes table block */
199 : : __le16 bg_free_blocks_count; /* Free blocks count */
200 : : __le16 bg_free_inodes_count; /* Free inodes count */
201 : : __le16 bg_used_dirs_count; /* Directories count */
202 : : __le16 bg_pad;
203 : : __le32 bg_reserved[3];
204 : : };
205 : :
206 : : /*
207 : : * Macro-instructions used to manage group descriptors
208 : : */
209 : : #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
210 : : #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
211 : : #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
212 : : #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
213 : :
214 : : /*
215 : : * Constants relative to the data blocks
216 : : */
217 : : #define EXT2_NDIR_BLOCKS 12
218 : : #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
219 : : #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
220 : : #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
221 : : #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
222 : :
223 : : /*
224 : : * Inode flags (GETFLAGS/SETFLAGS)
225 : : */
226 : : #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
227 : : #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
228 : : #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
229 : : #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
230 : : #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
231 : : #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
232 : : #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
233 : : #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
234 : : /* Reserved for compression usage... */
235 : : #define EXT2_DIRTY_FL FS_DIRTY_FL
236 : : #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
237 : : #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
238 : : #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
239 : : /* End compression flags --- maybe not all used */
240 : : #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
241 : : #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
242 : : #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
243 : : #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
244 : : #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
245 : : #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
246 : : #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
247 : : #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
248 : :
249 : : #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
250 : : #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
251 : :
252 : : /* Flags that should be inherited by new inodes from their parent. */
253 : : #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
254 : : EXT2_SYNC_FL | EXT2_NODUMP_FL |\
255 : : EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
256 : : EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
257 : : EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
258 : :
259 : : /* Flags that are appropriate for regular files (all but dir-specific ones). */
260 : : #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
261 : :
262 : : /* Flags that are appropriate for non-directories/regular files. */
263 : : #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
264 : :
265 : : /* Mask out flags that are inappropriate for the given type of inode. */
266 : : static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
267 : : {
268 [ # # ][ # # ]: 0 : if (S_ISDIR(mode))
269 : : return flags;
270 [ # # ]: 0 : else if (S_ISREG(mode))
271 : 0 : return flags & EXT2_REG_FLMASK;
272 : : else
273 : 0 : return flags & EXT2_OTHER_FLMASK;
274 : : }
275 : :
276 : : /*
277 : : * ioctl commands
278 : : */
279 : : #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
280 : : #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
281 : : #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
282 : : #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
283 : : #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
284 : : #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
285 : :
286 : : /*
287 : : * ioctl commands in 32 bit emulation
288 : : */
289 : : #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
290 : : #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
291 : : #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
292 : : #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
293 : :
294 : : /*
295 : : * Structure of an inode on the disk
296 : : */
297 : : struct ext2_inode {
298 : : __le16 i_mode; /* File mode */
299 : : __le16 i_uid; /* Low 16 bits of Owner Uid */
300 : : __le32 i_size; /* Size in bytes */
301 : : __le32 i_atime; /* Access time */
302 : : __le32 i_ctime; /* Creation time */
303 : : __le32 i_mtime; /* Modification time */
304 : : __le32 i_dtime; /* Deletion Time */
305 : : __le16 i_gid; /* Low 16 bits of Group Id */
306 : : __le16 i_links_count; /* Links count */
307 : : __le32 i_blocks; /* Blocks count */
308 : : __le32 i_flags; /* File flags */
309 : : union {
310 : : struct {
311 : : __le32 l_i_reserved1;
312 : : } linux1;
313 : : struct {
314 : : __le32 h_i_translator;
315 : : } hurd1;
316 : : struct {
317 : : __le32 m_i_reserved1;
318 : : } masix1;
319 : : } osd1; /* OS dependent 1 */
320 : : __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
321 : : __le32 i_generation; /* File version (for NFS) */
322 : : __le32 i_file_acl; /* File ACL */
323 : : __le32 i_dir_acl; /* Directory ACL */
324 : : __le32 i_faddr; /* Fragment address */
325 : : union {
326 : : struct {
327 : : __u8 l_i_frag; /* Fragment number */
328 : : __u8 l_i_fsize; /* Fragment size */
329 : : __u16 i_pad1;
330 : : __le16 l_i_uid_high; /* these 2 fields */
331 : : __le16 l_i_gid_high; /* were reserved2[0] */
332 : : __u32 l_i_reserved2;
333 : : } linux2;
334 : : struct {
335 : : __u8 h_i_frag; /* Fragment number */
336 : : __u8 h_i_fsize; /* Fragment size */
337 : : __le16 h_i_mode_high;
338 : : __le16 h_i_uid_high;
339 : : __le16 h_i_gid_high;
340 : : __le32 h_i_author;
341 : : } hurd2;
342 : : struct {
343 : : __u8 m_i_frag; /* Fragment number */
344 : : __u8 m_i_fsize; /* Fragment size */
345 : : __u16 m_pad1;
346 : : __u32 m_i_reserved2[2];
347 : : } masix2;
348 : : } osd2; /* OS dependent 2 */
349 : : };
350 : :
351 : : #define i_size_high i_dir_acl
352 : :
353 : : #define i_reserved1 osd1.linux1.l_i_reserved1
354 : : #define i_frag osd2.linux2.l_i_frag
355 : : #define i_fsize osd2.linux2.l_i_fsize
356 : : #define i_uid_low i_uid
357 : : #define i_gid_low i_gid
358 : : #define i_uid_high osd2.linux2.l_i_uid_high
359 : : #define i_gid_high osd2.linux2.l_i_gid_high
360 : : #define i_reserved2 osd2.linux2.l_i_reserved2
361 : :
362 : : /*
363 : : * File system states
364 : : */
365 : : #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
366 : : #define EXT2_ERROR_FS 0x0002 /* Errors detected */
367 : :
368 : : /*
369 : : * Mount flags
370 : : */
371 : : #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
372 : : #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
373 : : #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
374 : : #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
375 : : #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
376 : : #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
377 : : #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
378 : : #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
379 : : #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
380 : : #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
381 : : #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
382 : : #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
383 : : #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
384 : : #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
385 : : #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
386 : : #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
387 : :
388 : :
389 : : #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
390 : : #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
391 : : #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
392 : : EXT2_MOUNT_##opt)
393 : : /*
394 : : * Maximal mount counts between two filesystem checks
395 : : */
396 : : #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
397 : : #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
398 : :
399 : : /*
400 : : * Behaviour when detecting errors
401 : : */
402 : : #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
403 : : #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
404 : : #define EXT2_ERRORS_PANIC 3 /* Panic */
405 : : #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
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 directory file types. Only the low 3 bits are used. The
601 : : * other bits are reserved for now.
602 : : */
603 : : enum {
604 : : EXT2_FT_UNKNOWN = 0,
605 : : EXT2_FT_REG_FILE = 1,
606 : : EXT2_FT_DIR = 2,
607 : : EXT2_FT_CHRDEV = 3,
608 : : EXT2_FT_BLKDEV = 4,
609 : : EXT2_FT_FIFO = 5,
610 : : EXT2_FT_SOCK = 6,
611 : : EXT2_FT_SYMLINK = 7,
612 : : EXT2_FT_MAX
613 : : };
614 : :
615 : : /*
616 : : * EXT2_DIR_PAD defines the directory entries boundaries
617 : : *
618 : : * NOTE: It must be a multiple of 4
619 : : */
620 : : #define EXT2_DIR_PAD 4
621 : : #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
622 : : #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
623 : : ~EXT2_DIR_ROUND)
624 : : #define EXT2_MAX_REC_LEN ((1<<16)-1)
625 : :
626 : : static inline void verify_offsets(void)
627 : : {
628 : : #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
629 : : A(EXT2_SB_MAGIC_OFFSET, s_magic);
630 : : A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count);
631 : : A(EXT2_SB_BSIZE_OFFSET, s_log_block_size);
632 : : #undef A
633 : : }
634 : :
635 : : /*
636 : : * ext2 mount options
637 : : */
638 : : struct ext2_mount_options {
639 : : unsigned long s_mount_opt;
640 : : kuid_t s_resuid;
641 : : kgid_t s_resgid;
642 : : };
643 : :
644 : : /*
645 : : * second extended file system inode data in memory
646 : : */
647 : : struct ext2_inode_info {
648 : : __le32 i_data[15];
649 : : __u32 i_flags;
650 : : __u32 i_faddr;
651 : : __u8 i_frag_no;
652 : : __u8 i_frag_size;
653 : : __u16 i_state;
654 : : __u32 i_file_acl;
655 : : __u32 i_dir_acl;
656 : : __u32 i_dtime;
657 : :
658 : : /*
659 : : * i_block_group is the number of the block group which contains
660 : : * this file's inode. Constant across the lifetime of the inode,
661 : : * it is used for making block allocation decisions - we try to
662 : : * place a file's data blocks near its inode block, and new inodes
663 : : * near to their parent directory's inode.
664 : : */
665 : : __u32 i_block_group;
666 : :
667 : : /* block reservation info */
668 : : struct ext2_block_alloc_info *i_block_alloc_info;
669 : :
670 : : __u32 i_dir_start_lookup;
671 : : #ifdef CONFIG_EXT2_FS_XATTR
672 : : /*
673 : : * Extended attributes can be read independently of the main file
674 : : * data. Taking i_mutex even when reading would cause contention
675 : : * between readers of EAs and writers of regular file data, so
676 : : * instead we synchronize on xattr_sem when reading or changing
677 : : * EAs.
678 : : */
679 : : struct rw_semaphore xattr_sem;
680 : : #endif
681 : : rwlock_t i_meta_lock;
682 : :
683 : : /*
684 : : * truncate_mutex is for serialising ext2_truncate() against
685 : : * ext2_getblock(). It also protects the internals of the inode's
686 : : * reservation data structures: ext2_reserve_window and
687 : : * ext2_reserve_window_node.
688 : : */
689 : : struct mutex truncate_mutex;
690 : : struct inode vfs_inode;
691 : : struct list_head i_orphan; /* unlinked but open inodes */
692 : : };
693 : :
694 : : /*
695 : : * Inode dynamic state flags
696 : : */
697 : : #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
698 : :
699 : :
700 : : /*
701 : : * Function prototypes
702 : : */
703 : :
704 : : /*
705 : : * Ok, these declarations are also in <linux/kernel.h> but none of the
706 : : * ext2 source programs needs to include it so they are duplicated here.
707 : : */
708 : :
709 : : static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
710 : : {
711 : : return container_of(inode, struct ext2_inode_info, vfs_inode);
712 : : }
713 : :
714 : : /* balloc.c */
715 : : extern int ext2_bg_has_super(struct super_block *sb, int group);
716 : : extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
717 : : extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
718 : : extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
719 : : unsigned long *, int *);
720 : : extern void ext2_free_blocks (struct inode *, unsigned long,
721 : : unsigned long);
722 : : extern unsigned long ext2_count_free_blocks (struct super_block *);
723 : : extern unsigned long ext2_count_dirs (struct super_block *);
724 : : extern void ext2_check_blocks_bitmap (struct super_block *);
725 : : extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
726 : : unsigned int block_group,
727 : : struct buffer_head ** bh);
728 : : extern void ext2_discard_reservation (struct inode *);
729 : : extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
730 : : extern void ext2_init_block_alloc_info(struct inode *);
731 : : extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
732 : :
733 : : /* dir.c */
734 : : extern int ext2_add_link (struct dentry *, struct inode *);
735 : : extern ino_t ext2_inode_by_name(struct inode *, struct qstr *);
736 : : extern int ext2_make_empty(struct inode *, struct inode *);
737 : : extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **);
738 : : extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
739 : : extern int ext2_empty_dir (struct inode *);
740 : : extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
741 : : extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int);
742 : :
743 : : /* ialloc.c */
744 : : extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *);
745 : : extern void ext2_free_inode (struct inode *);
746 : : extern unsigned long ext2_count_free_inodes (struct super_block *);
747 : : extern void ext2_check_inodes_bitmap (struct super_block *);
748 : : extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
749 : :
750 : : /* inode.c */
751 : : extern struct inode *ext2_iget (struct super_block *, unsigned long);
752 : : extern int ext2_write_inode (struct inode *, struct writeback_control *);
753 : : extern void ext2_evict_inode(struct inode *);
754 : : extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
755 : : extern int ext2_setattr (struct dentry *, struct iattr *);
756 : : extern void ext2_set_inode_flags(struct inode *inode);
757 : : extern void ext2_get_inode_flags(struct ext2_inode_info *);
758 : : extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
759 : : u64 start, u64 len);
760 : :
761 : : /* ioctl.c */
762 : : extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
763 : : extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
764 : :
765 : : /* namei.c */
766 : : struct dentry *ext2_get_parent(struct dentry *child);
767 : :
768 : : /* super.c */
769 : : extern __printf(3, 4)
770 : : void ext2_error(struct super_block *, const char *, const char *, ...);
771 : : extern __printf(3, 4)
772 : : void ext2_msg(struct super_block *, const char *, const char *, ...);
773 : : extern void ext2_update_dynamic_rev (struct super_block *sb);
774 : : extern void ext2_write_super (struct super_block *);
775 : :
776 : : /*
777 : : * Inodes and files operations
778 : : */
779 : :
780 : : /* dir.c */
781 : : extern const struct file_operations ext2_dir_operations;
782 : :
783 : : /* file.c */
784 : : extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
785 : : int datasync);
786 : : extern const struct inode_operations ext2_file_inode_operations;
787 : : extern const struct file_operations ext2_file_operations;
788 : : extern const struct file_operations ext2_xip_file_operations;
789 : :
790 : : /* inode.c */
791 : : extern const struct address_space_operations ext2_aops;
792 : : extern const struct address_space_operations ext2_aops_xip;
793 : : extern const struct address_space_operations ext2_nobh_aops;
794 : :
795 : : /* namei.c */
796 : : extern const struct inode_operations ext2_dir_inode_operations;
797 : : extern const struct inode_operations ext2_special_inode_operations;
798 : :
799 : : /* symlink.c */
800 : : extern const struct inode_operations ext2_fast_symlink_inode_operations;
801 : : extern const struct inode_operations ext2_symlink_inode_operations;
802 : :
803 : : static inline ext2_fsblk_t
804 : 0 : ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
805 : : {
806 : 0 : return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
807 : 0 : le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
808 : : }
809 : :
810 : : #define ext2_set_bit __test_and_set_bit_le
811 : : #define ext2_clear_bit __test_and_clear_bit_le
812 : : #define ext2_test_bit test_bit_le
813 : : #define ext2_find_first_zero_bit find_first_zero_bit_le
814 : : #define ext2_find_next_zero_bit find_next_zero_bit_le
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