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ext2.h
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1 /*
2  * Copyright (C) 1992, 1993, 1994, 1995
3  * Remy Card ([email protected])
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 
30  ext2_fsblk_t _rsv_start; /* First byte reserved */
31  ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */
32 };
33 
35  struct rb_node rsv_node;
39 };
40 
42  /* information about reservation window */
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  */
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  */
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;
87  unsigned short s_mount_state;
88  unsigned short s_pad;
95  unsigned long s_dir_count;
101  /* root of the per fs reservation window tree */
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  */
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  */
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 */
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  if (S_ISDIR(mode))
269  return flags;
270  else if (S_ISREG(mode))
271  return flags & EXT2_REG_FLMASK;
272  else
273  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 {
312  } linux1;
313  struct {
315  } hurd1;
316  struct {
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 */
330  __le16 l_i_uid_high; /* these 2 fields */
331  __le16 l_i_gid_high; /* were reserved2[0] */
333  } linux2;
334  struct {
335  __u8 h_i_frag; /* Fragment number */
336  __u8 h_i_fsize; /* Fragment size */
341  } hurd2;
342  struct {
343  __u8 m_i_frag; /* Fragment number */
344  __u8 m_i_fsize; /* Fragment size */
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  */
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 */
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 */
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 */
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 
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  */
592  __le32 inode; /* Inode number */
593  __le16 rec_len; /* Directory entry length */
594  __u8 name_len; /* Name length */
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 {
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));
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  */
639  unsigned long s_mount_opt;
642 };
643 
644 /*
645  * second extended file system inode data in memory
646  */
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  */
666 
667  /* block reservation info */
669 
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
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  */
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 */
782 
783 /* file.c */
784 extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
785  int datasync);
788 extern const struct file_operations ext2_xip_file_operations;
789 
790 /* inode.c */
794 
795 /* namei.c */
798 
799 /* symlink.c */
802 
803 static inline ext2_fsblk_t
804 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
805 {
806  return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
807  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