block: get rid of elv_insert() interface
[linux-2.6.git] / include / linux / ext2_fs.h
1 /*
2  *  linux/include/linux/ext2_fs.h
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card (card@masi.ibp.fr)
6  * Laboratoire MASI - Institut Blaise Pascal
7  * Universite Pierre et Marie Curie (Paris VI)
8  *
9  *  from
10  *
11  *  linux/include/linux/minix_fs.h
12  *
13  *  Copyright (C) 1991, 1992  Linus Torvalds
14  */
15
16 #ifndef _LINUX_EXT2_FS_H
17 #define _LINUX_EXT2_FS_H
18
19 #include <linux/types.h>
20 #include <linux/magic.h>
21
22 /*
23  * The second extended filesystem constants/structures
24  */
25
26 /*
27  * Define EXT2FS_DEBUG to produce debug messages
28  */
29 #undef EXT2FS_DEBUG
30
31 /*
32  * Define EXT2_RESERVATION to reserve data blocks for expanding files
33  */
34 #define EXT2_DEFAULT_RESERVE_BLOCKS     8
35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
36 #define EXT2_MAX_RESERVE_BLOCKS         1027
37 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
38 /*
39  * The second extended file system version
40  */
41 #define EXT2FS_DATE             "95/08/09"
42 #define EXT2FS_VERSION          "0.5b"
43
44 /*
45  * Debug code
46  */
47 #ifdef EXT2FS_DEBUG
48 #       define ext2_debug(f, a...)      { \
49                                         printk ("EXT2-fs DEBUG (%s, %d): %s:", \
50                                                 __FILE__, __LINE__, __func__); \
51                                         printk (f, ## a); \
52                                         }
53 #else
54 #       define ext2_debug(f, a...)      /**/
55 #endif
56
57 /*
58  * Special inode numbers
59  */
60 #define EXT2_BAD_INO             1      /* Bad blocks inode */
61 #define EXT2_ROOT_INO            2      /* Root inode */
62 #define EXT2_BOOT_LOADER_INO     5      /* Boot loader inode */
63 #define EXT2_UNDEL_DIR_INO       6      /* Undelete directory inode */
64
65 /* First non-reserved inode for old ext2 filesystems */
66 #define EXT2_GOOD_OLD_FIRST_INO 11
67
68 #ifdef __KERNEL__
69 #include <linux/ext2_fs_sb.h>
70 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
71 {
72         return sb->s_fs_info;
73 }
74 #else
75 /* Assume that user mode programs are passing in an ext2fs superblock, not
76  * a kernel struct super_block.  This will allow us to call the feature-test
77  * macros from user land. */
78 #define EXT2_SB(sb)     (sb)
79 #endif
80
81 /*
82  * Maximal count of links to a file
83  */
84 #define EXT2_LINK_MAX           32000
85
86 /*
87  * Macro-instructions used to manage several block sizes
88  */
89 #define EXT2_MIN_BLOCK_SIZE             1024
90 #define EXT2_MAX_BLOCK_SIZE             4096
91 #define EXT2_MIN_BLOCK_LOG_SIZE           10
92 #ifdef __KERNEL__
93 # define EXT2_BLOCK_SIZE(s)             ((s)->s_blocksize)
94 #else
95 # define EXT2_BLOCK_SIZE(s)             (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
96 #endif
97 #define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
98 #ifdef __KERNEL__
99 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)
100 #else
101 # define EXT2_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)
102 #endif
103 #ifdef __KERNEL__
104 #define EXT2_ADDR_PER_BLOCK_BITS(s)     (EXT2_SB(s)->s_addr_per_block_bits)
105 #define EXT2_INODE_SIZE(s)              (EXT2_SB(s)->s_inode_size)
106 #define EXT2_FIRST_INO(s)               (EXT2_SB(s)->s_first_ino)
107 #else
108 #define EXT2_INODE_SIZE(s)      (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
109                                  EXT2_GOOD_OLD_INODE_SIZE : \
110                                  (s)->s_inode_size)
111 #define EXT2_FIRST_INO(s)       (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
112                                  EXT2_GOOD_OLD_FIRST_INO : \
113                                  (s)->s_first_ino)
114 #endif
115
116 /*
117  * Macro-instructions used to manage fragments
118  */
119 #define EXT2_MIN_FRAG_SIZE              1024
120 #define EXT2_MAX_FRAG_SIZE              4096
121 #define EXT2_MIN_FRAG_LOG_SIZE            10
122 #ifdef __KERNEL__
123 # define EXT2_FRAG_SIZE(s)              (EXT2_SB(s)->s_frag_size)
124 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_SB(s)->s_frags_per_block)
125 #else
126 # define EXT2_FRAG_SIZE(s)              (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
127 # define EXT2_FRAGS_PER_BLOCK(s)        (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
128 #endif
129
130 /*
131  * Structure of a blocks group descriptor
132  */
133 struct ext2_group_desc
134 {
135         __le32  bg_block_bitmap;                /* Blocks bitmap block */
136         __le32  bg_inode_bitmap;                /* Inodes bitmap block */
137         __le32  bg_inode_table;         /* Inodes table block */
138         __le16  bg_free_blocks_count;   /* Free blocks count */
139         __le16  bg_free_inodes_count;   /* Free inodes count */
140         __le16  bg_used_dirs_count;     /* Directories count */
141         __le16  bg_pad;
142         __le32  bg_reserved[3];
143 };
144
145 /*
146  * Macro-instructions used to manage group descriptors
147  */
148 #ifdef __KERNEL__
149 # define EXT2_BLOCKS_PER_GROUP(s)       (EXT2_SB(s)->s_blocks_per_group)
150 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_SB(s)->s_desc_per_block)
151 # define EXT2_INODES_PER_GROUP(s)       (EXT2_SB(s)->s_inodes_per_group)
152 # define EXT2_DESC_PER_BLOCK_BITS(s)    (EXT2_SB(s)->s_desc_per_block_bits)
153 #else
154 # define EXT2_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)
155 # define EXT2_DESC_PER_BLOCK(s)         (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
156 # define EXT2_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)
157 #endif
158
159 /*
160  * Constants relative to the data blocks
161  */
162 #define EXT2_NDIR_BLOCKS                12
163 #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
164 #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
165 #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
166 #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
167
168 /*
169  * Inode flags (GETFLAGS/SETFLAGS)
170  */
171 #define EXT2_SECRM_FL                   FS_SECRM_FL     /* Secure deletion */
172 #define EXT2_UNRM_FL                    FS_UNRM_FL      /* Undelete */
173 #define EXT2_COMPR_FL                   FS_COMPR_FL     /* Compress file */
174 #define EXT2_SYNC_FL                    FS_SYNC_FL      /* Synchronous updates */
175 #define EXT2_IMMUTABLE_FL               FS_IMMUTABLE_FL /* Immutable file */
176 #define EXT2_APPEND_FL                  FS_APPEND_FL    /* writes to file may only append */
177 #define EXT2_NODUMP_FL                  FS_NODUMP_FL    /* do not dump file */
178 #define EXT2_NOATIME_FL                 FS_NOATIME_FL   /* do not update atime */
179 /* Reserved for compression usage... */
180 #define EXT2_DIRTY_FL                   FS_DIRTY_FL
181 #define EXT2_COMPRBLK_FL                FS_COMPRBLK_FL  /* One or more compressed clusters */
182 #define EXT2_NOCOMP_FL                  FS_NOCOMP_FL    /* Don't compress */
183 #define EXT2_ECOMPR_FL                  FS_ECOMPR_FL    /* Compression error */
184 /* End compression flags --- maybe not all used */      
185 #define EXT2_BTREE_FL                   FS_BTREE_FL     /* btree format dir */
186 #define EXT2_INDEX_FL                   FS_INDEX_FL     /* hash-indexed directory */
187 #define EXT2_IMAGIC_FL                  FS_IMAGIC_FL    /* AFS directory */
188 #define EXT2_JOURNAL_DATA_FL            FS_JOURNAL_DATA_FL /* Reserved for ext3 */
189 #define EXT2_NOTAIL_FL                  FS_NOTAIL_FL    /* file tail should not be merged */
190 #define EXT2_DIRSYNC_FL                 FS_DIRSYNC_FL   /* dirsync behaviour (directories only) */
191 #define EXT2_TOPDIR_FL                  FS_TOPDIR_FL    /* Top of directory hierarchies*/
192 #define EXT2_RESERVED_FL                FS_RESERVED_FL  /* reserved for ext2 lib */
193
194 #define EXT2_FL_USER_VISIBLE            FS_FL_USER_VISIBLE      /* User visible flags */
195 #define EXT2_FL_USER_MODIFIABLE         FS_FL_USER_MODIFIABLE   /* User modifiable flags */
196
197 /* Flags that should be inherited by new inodes from their parent. */
198 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
199                            EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\
200                            EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\
201                            EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
202                            EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
203
204 /* Flags that are appropriate for regular files (all but dir-specific ones). */
205 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
206
207 /* Flags that are appropriate for non-directories/regular files. */
208 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
209
210 /* Mask out flags that are inappropriate for the given type of inode. */
211 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
212 {
213         if (S_ISDIR(mode))
214                 return flags;
215         else if (S_ISREG(mode))
216                 return flags & EXT2_REG_FLMASK;
217         else
218                 return flags & EXT2_OTHER_FLMASK;
219 }
220
221 /*
222  * ioctl commands
223  */
224 #define EXT2_IOC_GETFLAGS               FS_IOC_GETFLAGS
225 #define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
226 #define EXT2_IOC_GETVERSION             FS_IOC_GETVERSION
227 #define EXT2_IOC_SETVERSION             FS_IOC_SETVERSION
228 #define EXT2_IOC_GETRSVSZ               _IOR('f', 5, long)
229 #define EXT2_IOC_SETRSVSZ               _IOW('f', 6, long)
230
231 /*
232  * ioctl commands in 32 bit emulation
233  */
234 #define EXT2_IOC32_GETFLAGS             FS_IOC32_GETFLAGS
235 #define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
236 #define EXT2_IOC32_GETVERSION           FS_IOC32_GETVERSION
237 #define EXT2_IOC32_SETVERSION           FS_IOC32_SETVERSION
238
239 /*
240  * Structure of an inode on the disk
241  */
242 struct ext2_inode {
243         __le16  i_mode;         /* File mode */
244         __le16  i_uid;          /* Low 16 bits of Owner Uid */
245         __le32  i_size;         /* Size in bytes */
246         __le32  i_atime;        /* Access time */
247         __le32  i_ctime;        /* Creation time */
248         __le32  i_mtime;        /* Modification time */
249         __le32  i_dtime;        /* Deletion Time */
250         __le16  i_gid;          /* Low 16 bits of Group Id */
251         __le16  i_links_count;  /* Links count */
252         __le32  i_blocks;       /* Blocks count */
253         __le32  i_flags;        /* File flags */
254         union {
255                 struct {
256                         __le32  l_i_reserved1;
257                 } linux1;
258                 struct {
259                         __le32  h_i_translator;
260                 } hurd1;
261                 struct {
262                         __le32  m_i_reserved1;
263                 } masix1;
264         } osd1;                         /* OS dependent 1 */
265         __le32  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
266         __le32  i_generation;   /* File version (for NFS) */
267         __le32  i_file_acl;     /* File ACL */
268         __le32  i_dir_acl;      /* Directory ACL */
269         __le32  i_faddr;        /* Fragment address */
270         union {
271                 struct {
272                         __u8    l_i_frag;       /* Fragment number */
273                         __u8    l_i_fsize;      /* Fragment size */
274                         __u16   i_pad1;
275                         __le16  l_i_uid_high;   /* these 2 fields    */
276                         __le16  l_i_gid_high;   /* were reserved2[0] */
277                         __u32   l_i_reserved2;
278                 } linux2;
279                 struct {
280                         __u8    h_i_frag;       /* Fragment number */
281                         __u8    h_i_fsize;      /* Fragment size */
282                         __le16  h_i_mode_high;
283                         __le16  h_i_uid_high;
284                         __le16  h_i_gid_high;
285                         __le32  h_i_author;
286                 } hurd2;
287                 struct {
288                         __u8    m_i_frag;       /* Fragment number */
289                         __u8    m_i_fsize;      /* Fragment size */
290                         __u16   m_pad1;
291                         __u32   m_i_reserved2[2];
292                 } masix2;
293         } osd2;                         /* OS dependent 2 */
294 };
295
296 #define i_size_high     i_dir_acl
297
298 #if defined(__KERNEL__) || defined(__linux__)
299 #define i_reserved1     osd1.linux1.l_i_reserved1
300 #define i_frag          osd2.linux2.l_i_frag
301 #define i_fsize         osd2.linux2.l_i_fsize
302 #define i_uid_low       i_uid
303 #define i_gid_low       i_gid
304 #define i_uid_high      osd2.linux2.l_i_uid_high
305 #define i_gid_high      osd2.linux2.l_i_gid_high
306 #define i_reserved2     osd2.linux2.l_i_reserved2
307 #endif
308
309 #ifdef  __hurd__
310 #define i_translator    osd1.hurd1.h_i_translator
311 #define i_frag          osd2.hurd2.h_i_frag
312 #define i_fsize         osd2.hurd2.h_i_fsize
313 #define i_uid_high      osd2.hurd2.h_i_uid_high
314 #define i_gid_high      osd2.hurd2.h_i_gid_high
315 #define i_author        osd2.hurd2.h_i_author
316 #endif
317
318 #ifdef  __masix__
319 #define i_reserved1     osd1.masix1.m_i_reserved1
320 #define i_frag          osd2.masix2.m_i_frag
321 #define i_fsize         osd2.masix2.m_i_fsize
322 #define i_reserved2     osd2.masix2.m_i_reserved2
323 #endif
324
325 /*
326  * File system states
327  */
328 #define EXT2_VALID_FS                   0x0001  /* Unmounted cleanly */
329 #define EXT2_ERROR_FS                   0x0002  /* Errors detected */
330
331 /*
332  * Mount flags
333  */
334 #define EXT2_MOUNT_CHECK                0x000001  /* Do mount-time checks */
335 #define EXT2_MOUNT_OLDALLOC             0x000002  /* Don't use the new Orlov allocator */
336 #define EXT2_MOUNT_GRPID                0x000004  /* Create files with directory's group */
337 #define EXT2_MOUNT_DEBUG                0x000008  /* Some debugging messages */
338 #define EXT2_MOUNT_ERRORS_CONT          0x000010  /* Continue on errors */
339 #define EXT2_MOUNT_ERRORS_RO            0x000020  /* Remount fs ro on errors */
340 #define EXT2_MOUNT_ERRORS_PANIC         0x000040  /* Panic on errors */
341 #define EXT2_MOUNT_MINIX_DF             0x000080  /* Mimics the Minix statfs */
342 #define EXT2_MOUNT_NOBH                 0x000100  /* No buffer_heads */
343 #define EXT2_MOUNT_NO_UID32             0x000200  /* Disable 32-bit UIDs */
344 #define EXT2_MOUNT_XATTR_USER           0x004000  /* Extended user attributes */
345 #define EXT2_MOUNT_POSIX_ACL            0x008000  /* POSIX Access Control Lists */
346 #define EXT2_MOUNT_XIP                  0x010000  /* Execute in place */
347 #define EXT2_MOUNT_USRQUOTA             0x020000  /* user quota */
348 #define EXT2_MOUNT_GRPQUOTA             0x040000  /* group quota */
349 #define EXT2_MOUNT_RESERVATION          0x080000  /* Preallocation */
350
351
352 #define clear_opt(o, opt)               o &= ~EXT2_MOUNT_##opt
353 #define set_opt(o, opt)                 o |= EXT2_MOUNT_##opt
354 #define test_opt(sb, opt)               (EXT2_SB(sb)->s_mount_opt & \
355                                          EXT2_MOUNT_##opt)
356 /*
357  * Maximal mount counts between two filesystem checks
358  */
359 #define EXT2_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */
360 #define EXT2_DFL_CHECKINTERVAL          0       /* Don't use interval check */
361
362 /*
363  * Behaviour when detecting errors
364  */
365 #define EXT2_ERRORS_CONTINUE            1       /* Continue execution */
366 #define EXT2_ERRORS_RO                  2       /* Remount fs read-only */
367 #define EXT2_ERRORS_PANIC               3       /* Panic */
368 #define EXT2_ERRORS_DEFAULT             EXT2_ERRORS_CONTINUE
369
370 /*
371  * Structure of the super block
372  */
373 struct ext2_super_block {
374         __le32  s_inodes_count;         /* Inodes count */
375         __le32  s_blocks_count;         /* Blocks count */
376         __le32  s_r_blocks_count;       /* Reserved blocks count */
377         __le32  s_free_blocks_count;    /* Free blocks count */
378         __le32  s_free_inodes_count;    /* Free inodes count */
379         __le32  s_first_data_block;     /* First Data Block */
380         __le32  s_log_block_size;       /* Block size */
381         __le32  s_log_frag_size;        /* Fragment size */
382         __le32  s_blocks_per_group;     /* # Blocks per group */
383         __le32  s_frags_per_group;      /* # Fragments per group */
384         __le32  s_inodes_per_group;     /* # Inodes per group */
385         __le32  s_mtime;                /* Mount time */
386         __le32  s_wtime;                /* Write time */
387         __le16  s_mnt_count;            /* Mount count */
388         __le16  s_max_mnt_count;        /* Maximal mount count */
389         __le16  s_magic;                /* Magic signature */
390         __le16  s_state;                /* File system state */
391         __le16  s_errors;               /* Behaviour when detecting errors */
392         __le16  s_minor_rev_level;      /* minor revision level */
393         __le32  s_lastcheck;            /* time of last check */
394         __le32  s_checkinterval;        /* max. time between checks */
395         __le32  s_creator_os;           /* OS */
396         __le32  s_rev_level;            /* Revision level */
397         __le16  s_def_resuid;           /* Default uid for reserved blocks */
398         __le16  s_def_resgid;           /* Default gid for reserved blocks */
399         /*
400          * These fields are for EXT2_DYNAMIC_REV superblocks only.
401          *
402          * Note: the difference between the compatible feature set and
403          * the incompatible feature set is that if there is a bit set
404          * in the incompatible feature set that the kernel doesn't
405          * know about, it should refuse to mount the filesystem.
406          * 
407          * e2fsck's requirements are more strict; if it doesn't know
408          * about a feature in either the compatible or incompatible
409          * feature set, it must abort and not try to meddle with
410          * things it doesn't understand...
411          */
412         __le32  s_first_ino;            /* First non-reserved inode */
413         __le16   s_inode_size;          /* size of inode structure */
414         __le16  s_block_group_nr;       /* block group # of this superblock */
415         __le32  s_feature_compat;       /* compatible feature set */
416         __le32  s_feature_incompat;     /* incompatible feature set */
417         __le32  s_feature_ro_compat;    /* readonly-compatible feature set */
418         __u8    s_uuid[16];             /* 128-bit uuid for volume */
419         char    s_volume_name[16];      /* volume name */
420         char    s_last_mounted[64];     /* directory where last mounted */
421         __le32  s_algorithm_usage_bitmap; /* For compression */
422         /*
423          * Performance hints.  Directory preallocation should only
424          * happen if the EXT2_COMPAT_PREALLOC flag is on.
425          */
426         __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/
427         __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */
428         __u16   s_padding1;
429         /*
430          * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
431          */
432         __u8    s_journal_uuid[16];     /* uuid of journal superblock */
433         __u32   s_journal_inum;         /* inode number of journal file */
434         __u32   s_journal_dev;          /* device number of journal file */
435         __u32   s_last_orphan;          /* start of list of inodes to delete */
436         __u32   s_hash_seed[4];         /* HTREE hash seed */
437         __u8    s_def_hash_version;     /* Default hash version to use */
438         __u8    s_reserved_char_pad;
439         __u16   s_reserved_word_pad;
440         __le32  s_default_mount_opts;
441         __le32  s_first_meta_bg;        /* First metablock block group */
442         __u32   s_reserved[190];        /* Padding to the end of the block */
443 };
444
445 /*
446  * Codes for operating systems
447  */
448 #define EXT2_OS_LINUX           0
449 #define EXT2_OS_HURD            1
450 #define EXT2_OS_MASIX           2
451 #define EXT2_OS_FREEBSD         3
452 #define EXT2_OS_LITES           4
453
454 /*
455  * Revision levels
456  */
457 #define EXT2_GOOD_OLD_REV       0       /* The good old (original) format */
458 #define EXT2_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */
459
460 #define EXT2_CURRENT_REV        EXT2_GOOD_OLD_REV
461 #define EXT2_MAX_SUPP_REV       EXT2_DYNAMIC_REV
462
463 #define EXT2_GOOD_OLD_INODE_SIZE 128
464
465 /*
466  * Feature set definitions
467  */
468
469 #define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
470         ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
471 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
472         ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
473 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
474         ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
475 #define EXT2_SET_COMPAT_FEATURE(sb,mask)                        \
476         EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
477 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)                     \
478         EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
479 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask)                      \
480         EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
481 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)                      \
482         EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
483 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \
484         EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
485 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \
486         EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
487
488 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC        0x0001
489 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES       0x0002
490 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004
491 #define EXT2_FEATURE_COMPAT_EXT_ATTR            0x0008
492 #define EXT2_FEATURE_COMPAT_RESIZE_INO          0x0010
493 #define EXT2_FEATURE_COMPAT_DIR_INDEX           0x0020
494 #define EXT2_FEATURE_COMPAT_ANY                 0xffffffff
495
496 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001
497 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE       0x0002
498 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR        0x0004
499 #define EXT2_FEATURE_RO_COMPAT_ANY              0xffffffff
500
501 #define EXT2_FEATURE_INCOMPAT_COMPRESSION       0x0001
502 #define EXT2_FEATURE_INCOMPAT_FILETYPE          0x0002
503 #define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004
504 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008
505 #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
506 #define EXT2_FEATURE_INCOMPAT_ANY               0xffffffff
507
508 #define EXT2_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR
509 #define EXT2_FEATURE_INCOMPAT_SUPP      (EXT2_FEATURE_INCOMPAT_FILETYPE| \
510                                          EXT2_FEATURE_INCOMPAT_META_BG)
511 #define EXT2_FEATURE_RO_COMPAT_SUPP     (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
512                                          EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
513                                          EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
514 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED      ~EXT2_FEATURE_RO_COMPAT_SUPP
515 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED       ~EXT2_FEATURE_INCOMPAT_SUPP
516
517 /*
518  * Default values for user and/or group using reserved blocks
519  */
520 #define EXT2_DEF_RESUID         0
521 #define EXT2_DEF_RESGID         0
522
523 /*
524  * Default mount options
525  */
526 #define EXT2_DEFM_DEBUG         0x0001
527 #define EXT2_DEFM_BSDGROUPS     0x0002
528 #define EXT2_DEFM_XATTR_USER    0x0004
529 #define EXT2_DEFM_ACL           0x0008
530 #define EXT2_DEFM_UID16         0x0010
531     /* Not used by ext2, but reserved for use by ext3 */
532 #define EXT3_DEFM_JMODE         0x0060 
533 #define EXT3_DEFM_JMODE_DATA    0x0020
534 #define EXT3_DEFM_JMODE_ORDERED 0x0040
535 #define EXT3_DEFM_JMODE_WBACK   0x0060
536
537 /*
538  * Structure of a directory entry
539  */
540 #define EXT2_NAME_LEN 255
541
542 struct ext2_dir_entry {
543         __le32  inode;                  /* Inode number */
544         __le16  rec_len;                /* Directory entry length */
545         __le16  name_len;               /* Name length */
546         char    name[EXT2_NAME_LEN];    /* File name */
547 };
548
549 /*
550  * The new version of the directory entry.  Since EXT2 structures are
551  * stored in intel byte order, and the name_len field could never be
552  * bigger than 255 chars, it's safe to reclaim the extra byte for the
553  * file_type field.
554  */
555 struct ext2_dir_entry_2 {
556         __le32  inode;                  /* Inode number */
557         __le16  rec_len;                /* Directory entry length */
558         __u8    name_len;               /* Name length */
559         __u8    file_type;
560         char    name[EXT2_NAME_LEN];    /* File name */
561 };
562
563 /*
564  * Ext2 directory file types.  Only the low 3 bits are used.  The
565  * other bits are reserved for now.
566  */
567 enum {
568         EXT2_FT_UNKNOWN         = 0,
569         EXT2_FT_REG_FILE        = 1,
570         EXT2_FT_DIR             = 2,
571         EXT2_FT_CHRDEV          = 3,
572         EXT2_FT_BLKDEV          = 4,
573         EXT2_FT_FIFO            = 5,
574         EXT2_FT_SOCK            = 6,
575         EXT2_FT_SYMLINK         = 7,
576         EXT2_FT_MAX
577 };
578
579 /*
580  * EXT2_DIR_PAD defines the directory entries boundaries
581  *
582  * NOTE: It must be a multiple of 4
583  */
584 #define EXT2_DIR_PAD                    4
585 #define EXT2_DIR_ROUND                  (EXT2_DIR_PAD - 1)
586 #define EXT2_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT2_DIR_ROUND) & \
587                                          ~EXT2_DIR_ROUND)
588 #define EXT2_MAX_REC_LEN                ((1<<16)-1)
589
590 #endif  /* _LINUX_EXT2_FS_H */