1/*-
2 * modified for EXT2FS support in Lites 1.1
3 *
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
6 *
| 1/*-
2 * modified for EXT2FS support in Lites 1.1
3 *
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
6 *
|
7 * $FreeBSD: head/sys/fs/ext2fs/ext2fs.h 228583 2011-12-16 15:47:43Z pfg $
| 7 * $FreeBSD: head/sys/fs/ext2fs/ext2fs.h 231168 2012-02-07 22:31:28Z pfg $
|
8 */
9/*-
10 * Copyright (c) 2009 Aditya Sarawgi
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *
35 */
36
37#ifndef _FS_EXT2FS_EXT2FS_H_
38#define _FS_EXT2FS_EXT2FS_H_
39
40#include <sys/types.h>
41
42/*
43 * Maximal count of links to a file
44 */
45#define EXT2_LINK_MAX 32000
46
47/*
48 * A summary of contiguous blocks of various sizes is maintained
49 * in each cylinder group. Normally this is set by the initial
50 * value of fs_maxcontig.
51 *
52 * XXX:FS_MAXCONTIG is set to 16 to conserve space. Here we set
53 * EXT2_MAXCONTIG to 32 for better performance.
54 */
55#define EXT2_MAXCONTIG 32
56
57/*
58 * Constants relative to the data blocks
59 */
60#define EXT2_NDIR_BLOCKS 12
61#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
62#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
63#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
64#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
65#define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof(uint32_t))
66
67/*
68 * The path name on which the file system is mounted is maintained
69 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
70 * the super block for this name.
71 */
72#define MAXMNTLEN 512
73
74/*
75 * Super block for an ext2fs file system.
76 */
77struct ext2fs {
78 uint32_t e2fs_icount; /* Inode count */
79 uint32_t e2fs_bcount; /* blocks count */
80 uint32_t e2fs_rbcount; /* reserved blocks count */
81 uint32_t e2fs_fbcount; /* free blocks count */
82 uint32_t e2fs_ficount; /* free inodes count */
83 uint32_t e2fs_first_dblock; /* first data block */
84 uint32_t e2fs_log_bsize; /* block size = 1024*(2^e2fs_log_bsize) */
85 uint32_t e2fs_log_fsize; /* fragment size */
86 uint32_t e2fs_bpg; /* blocks per group */
87 uint32_t e2fs_fpg; /* frags per group */
88 uint32_t e2fs_ipg; /* inodes per group */
89 uint32_t e2fs_mtime; /* mount time */
90 uint32_t e2fs_wtime; /* write time */
91 uint16_t e2fs_mnt_count; /* mount count */
92 uint16_t e2fs_max_mnt_count; /* max mount count */
93 uint16_t e2fs_magic; /* magic number */
94 uint16_t e2fs_state; /* file system state */
95 uint16_t e2fs_beh; /* behavior on errors */
96 uint16_t e2fs_minrev; /* minor revision level */
97 uint32_t e2fs_lastfsck; /* time of last fsck */
98 uint32_t e2fs_fsckintv; /* max time between fscks */
99 uint32_t e2fs_creator; /* creator OS */
100 uint32_t e2fs_rev; /* revision level */
101 uint16_t e2fs_ruid; /* default uid for reserved blocks */
102 uint16_t e2fs_rgid; /* default gid for reserved blocks */
103 /* EXT2_DYNAMIC_REV superblocks */
104 uint32_t e2fs_first_ino; /* first non-reserved inode */
105 uint16_t e2fs_inode_size; /* size of inode structure */
106 uint16_t e2fs_block_group_nr; /* block grp number of this sblk*/
107 uint32_t e2fs_features_compat; /* compatible feature set */
108 uint32_t e2fs_features_incompat; /* incompatible feature set */
109 uint32_t e2fs_features_rocompat; /* RO-compatible feature set */
110 uint8_t e2fs_uuid[16]; /* 128-bit uuid for volume */
111 char e2fs_vname[16]; /* volume name */
112 char e2fs_fsmnt[64]; /* name mounted on */
113 uint32_t e2fs_algo; /* For compression */
114 uint8_t e2fs_prealloc; /* # of blocks for old prealloc */
115 uint8_t e2fs_dir_prealloc; /* # of blocks for old prealloc dirs */
116 uint16_t e2fs_reserved_ngdb; /* # of reserved gd blocks for resize */
117 char e3fs_journal_uuid[16]; /* uuid of journal superblock */
118 uint32_t e3fs_journal_inum; /* inode number of journal file */
119 uint32_t e3fs_journal_dev; /* device number of journal file */
120 uint32_t e3fs_last_orphan; /* start of list of inodes to delete */
121 uint32_t e3fs_hash_seed[4]; /* HTREE hash seed */
122 char e3fs_def_hash_version; /* Default hash version to use */
123 char e3fs_reserved_char_pad;
124 uint32_t e3fs_default_mount_opts;
125 uint32_t e3fs_first_meta_bg; /* First metablock block group */
| 8 */
9/*-
10 * Copyright (c) 2009 Aditya Sarawgi
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *
35 */
36
37#ifndef _FS_EXT2FS_EXT2FS_H_
38#define _FS_EXT2FS_EXT2FS_H_
39
40#include <sys/types.h>
41
42/*
43 * Maximal count of links to a file
44 */
45#define EXT2_LINK_MAX 32000
46
47/*
48 * A summary of contiguous blocks of various sizes is maintained
49 * in each cylinder group. Normally this is set by the initial
50 * value of fs_maxcontig.
51 *
52 * XXX:FS_MAXCONTIG is set to 16 to conserve space. Here we set
53 * EXT2_MAXCONTIG to 32 for better performance.
54 */
55#define EXT2_MAXCONTIG 32
56
57/*
58 * Constants relative to the data blocks
59 */
60#define EXT2_NDIR_BLOCKS 12
61#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
62#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
63#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
64#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
65#define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof(uint32_t))
66
67/*
68 * The path name on which the file system is mounted is maintained
69 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
70 * the super block for this name.
71 */
72#define MAXMNTLEN 512
73
74/*
75 * Super block for an ext2fs file system.
76 */
77struct ext2fs {
78 uint32_t e2fs_icount; /* Inode count */
79 uint32_t e2fs_bcount; /* blocks count */
80 uint32_t e2fs_rbcount; /* reserved blocks count */
81 uint32_t e2fs_fbcount; /* free blocks count */
82 uint32_t e2fs_ficount; /* free inodes count */
83 uint32_t e2fs_first_dblock; /* first data block */
84 uint32_t e2fs_log_bsize; /* block size = 1024*(2^e2fs_log_bsize) */
85 uint32_t e2fs_log_fsize; /* fragment size */
86 uint32_t e2fs_bpg; /* blocks per group */
87 uint32_t e2fs_fpg; /* frags per group */
88 uint32_t e2fs_ipg; /* inodes per group */
89 uint32_t e2fs_mtime; /* mount time */
90 uint32_t e2fs_wtime; /* write time */
91 uint16_t e2fs_mnt_count; /* mount count */
92 uint16_t e2fs_max_mnt_count; /* max mount count */
93 uint16_t e2fs_magic; /* magic number */
94 uint16_t e2fs_state; /* file system state */
95 uint16_t e2fs_beh; /* behavior on errors */
96 uint16_t e2fs_minrev; /* minor revision level */
97 uint32_t e2fs_lastfsck; /* time of last fsck */
98 uint32_t e2fs_fsckintv; /* max time between fscks */
99 uint32_t e2fs_creator; /* creator OS */
100 uint32_t e2fs_rev; /* revision level */
101 uint16_t e2fs_ruid; /* default uid for reserved blocks */
102 uint16_t e2fs_rgid; /* default gid for reserved blocks */
103 /* EXT2_DYNAMIC_REV superblocks */
104 uint32_t e2fs_first_ino; /* first non-reserved inode */
105 uint16_t e2fs_inode_size; /* size of inode structure */
106 uint16_t e2fs_block_group_nr; /* block grp number of this sblk*/
107 uint32_t e2fs_features_compat; /* compatible feature set */
108 uint32_t e2fs_features_incompat; /* incompatible feature set */
109 uint32_t e2fs_features_rocompat; /* RO-compatible feature set */
110 uint8_t e2fs_uuid[16]; /* 128-bit uuid for volume */
111 char e2fs_vname[16]; /* volume name */
112 char e2fs_fsmnt[64]; /* name mounted on */
113 uint32_t e2fs_algo; /* For compression */
114 uint8_t e2fs_prealloc; /* # of blocks for old prealloc */
115 uint8_t e2fs_dir_prealloc; /* # of blocks for old prealloc dirs */
116 uint16_t e2fs_reserved_ngdb; /* # of reserved gd blocks for resize */
117 char e3fs_journal_uuid[16]; /* uuid of journal superblock */
118 uint32_t e3fs_journal_inum; /* inode number of journal file */
119 uint32_t e3fs_journal_dev; /* device number of journal file */
120 uint32_t e3fs_last_orphan; /* start of list of inodes to delete */
121 uint32_t e3fs_hash_seed[4]; /* HTREE hash seed */
122 char e3fs_def_hash_version; /* Default hash version to use */
123 char e3fs_reserved_char_pad;
124 uint32_t e3fs_default_mount_opts;
125 uint32_t e3fs_first_meta_bg; /* First metablock block group */
|
126 uint32_t reserved2[190]; /* Padding to the end of the block */
| 126 uint32_t e3fs_mkfs_time; /* when the fs was created */
127 uint32_t e3fs_jnl_blks[17]; /* backup of the journal inode */
128 uint32_t e4fs_bcount_hi; /* block count */
129 uint32_t e4fs_rbcount_hi; /* reserved blocks count */
130 uint32_t e4fs_fbcount_hi; /* free blocks count */
131 uint16_t e4fs_min_extra_isize;/* all inodes have at least some bytes */
132 uint16_t e4fs_want_extra_isize; /* new inodes should reserve some bytes */
133 uint32_t e4fs_flags; /* miscellaneous flags */
134 uint16_t e4fs_raid_stride; /* RAID stride */
135 uint16_t e4fs_mmpintv; /* number of seconds to wait in MMP checking */
136 uint64_t e4fs_mmpblk; /* block for multi-mount protection */
137 uint32_t e4fs_raid_stripe_wid;/* blocks on all data disks (N * stride) */
138 uint8_t e4fs_log_gpf; /* FLEX_BG group size */
139 uint8_t e4fs_char_pad2;
140 uint16_t e4fs_pad;
141 uint32_t reserved2[162]; /* Padding to the end of the block */
|
127};
128
129
130/*
131 * In-Memory Superblock
132 */
133
134struct m_ext2fs {
135 struct ext2fs * e2fs;
136 char e2fs_fsmnt[MAXMNTLEN];/* name mounted on */
137 char e2fs_ronly; /* mounted read-only flag */
138 char e2fs_fmod; /* super block modified flag */
139 uint32_t e2fs_bsize; /* Block size */
140 uint32_t e2fs_bshift; /* calc of logical block no */
141 int32_t e2fs_bmask; /* calc of block offset */
| 142};
143
144
145/*
146 * In-Memory Superblock
147 */
148
149struct m_ext2fs {
150 struct ext2fs * e2fs;
151 char e2fs_fsmnt[MAXMNTLEN];/* name mounted on */
152 char e2fs_ronly; /* mounted read-only flag */
153 char e2fs_fmod; /* super block modified flag */
154 uint32_t e2fs_bsize; /* Block size */
155 uint32_t e2fs_bshift; /* calc of logical block no */
156 int32_t e2fs_bmask; /* calc of block offset */
|
142 int32_t e2fs_bpg; /* Number of blocks per group */
| 157 int32_t e2fs_bpg; /* Number of blocks per group */
|
143 int64_t e2fs_qbmask; /* = s_blocksize -1 */
144 uint32_t e2fs_fsbtodb; /* Shift to get disk block */
| 158 int64_t e2fs_qbmask; /* = s_blocksize -1 */
159 uint32_t e2fs_fsbtodb; /* Shift to get disk block */
|
145 uint32_t e2fs_ipg; /* Number of inodes per group */
146 uint32_t e2fs_ipb; /* Number of inodes per block */
| 160 uint32_t e2fs_ipg; /* Number of inodes per group */
161 uint32_t e2fs_ipb; /* Number of inodes per block */
|
147 uint32_t e2fs_itpg; /* Number of inode table per group */
148 uint32_t e2fs_fsize; /* Size of fragments per block */
| 162 uint32_t e2fs_itpg; /* Number of inode table per group */
163 uint32_t e2fs_fsize; /* Size of fragments per block */
|
149 uint32_t e2fs_fpb; /* Number of fragments per block */
150 uint32_t e2fs_fpg; /* Number of fragments per group */
| 164 uint32_t e2fs_fpb; /* Number of fragments per block */
165 uint32_t e2fs_fpg; /* Number of fragments per group */
|
151 uint32_t e2fs_dbpg; /* Number of descriptor blocks per group */
152 uint32_t e2fs_descpb; /* Number of group descriptors per block */
153 uint32_t e2fs_gdbcount; /* Number of group descriptors */
154 uint32_t e2fs_gcount; /* Number of groups */
155 uint32_t e2fs_first_inode;/* First inode on fs */
156 int32_t e2fs_isize; /* Size of inode */
157 uint32_t e2fs_mount_opt;
158 uint32_t e2fs_blocksize_bits;
159 uint32_t e2fs_total_dir; /* Total number of directories */
160 uint8_t *e2fs_contigdirs; /* (u) # of contig. allocated dirs */
161 char e2fs_wasvalid; /* valid at mount time */
162 off_t e2fs_maxfilesize;
163 struct ext2_gd *e2fs_gd; /* Group Descriptors */
| 166 uint32_t e2fs_dbpg; /* Number of descriptor blocks per group */
167 uint32_t e2fs_descpb; /* Number of group descriptors per block */
168 uint32_t e2fs_gdbcount; /* Number of group descriptors */
169 uint32_t e2fs_gcount; /* Number of groups */
170 uint32_t e2fs_first_inode;/* First inode on fs */
171 int32_t e2fs_isize; /* Size of inode */
172 uint32_t e2fs_mount_opt;
173 uint32_t e2fs_blocksize_bits;
174 uint32_t e2fs_total_dir; /* Total number of directories */
175 uint8_t *e2fs_contigdirs; /* (u) # of contig. allocated dirs */
176 char e2fs_wasvalid; /* valid at mount time */
177 off_t e2fs_maxfilesize;
178 struct ext2_gd *e2fs_gd; /* Group Descriptors */
|
164 int32_t e2fs_maxcontig; /* max number of contiguous blks */
| 179 int32_t e2fs_maxcontig; /* max number of contiguous blks */
|
165 int32_t e2fs_contigsumsize; /* size of cluster summary array */
166 int32_t *e2fs_maxcluster; /* max cluster in each cyl group */
167 struct csum *e2fs_clustersum; /* cluster summary in each cyl group */
168};
169
170/*
171 * The second extended file system version
172 */
173#define E2FS_DATE "95/08/09"
174#define E2FS_VERSION "0.5b"
175
176/*
177 * The second extended file system magic number
178 */
179#define E2FS_MAGIC 0xEF53
180
181/*
182 * Revision levels
183 */
184#define E2FS_REV0 0 /* The good old (original) format */
185#define E2FS_REV1 1 /* V2 format w/ dynamic inode sizes */
186
187#define E2FS_CURRENT_REV E2FS_REV0
188#define E2FS_MAX_SUPP_REV E2FS_REV1
189
190#define E2FS_REV0_INODE_SIZE 128
191
192/*
193 * compatible/incompatible features
194 */
195#define EXT2F_COMPAT_PREALLOC 0x0001
196#define EXT2F_COMPAT_HASJOURNAL 0x0004
197#define EXT2F_COMPAT_RESIZE 0x0010
198
199#define EXT2F_ROCOMPAT_SPARSESUPER 0x0001
200#define EXT2F_ROCOMPAT_LARGEFILE 0x0002
201#define EXT2F_ROCOMPAT_BTREE_DIR 0x0004
202
203#define EXT2F_INCOMPAT_COMP 0x0001
204#define EXT2F_INCOMPAT_FTYPE 0x0002
205
206/*
207 * Features supported in this implementation
208 *
209 * We support the following REV1 features:
210 * - EXT2F_ROCOMPAT_SPARSESUPER
211 * - EXT2F_ROCOMPAT_LARGEFILE
212 * - EXT2F_INCOMPAT_FTYPE
213 */
214#define EXT2F_COMPAT_SUPP 0x0000
215#define EXT2F_ROCOMPAT_SUPP (EXT2F_ROCOMPAT_SPARSESUPER \
216 | EXT2F_ROCOMPAT_LARGEFILE)
217#define EXT2F_INCOMPAT_SUPP EXT2F_INCOMPAT_FTYPE
218
219/* Assume that user mode programs are passing in an ext2fs superblock, not
220 * a kernel struct super_block. This will allow us to call the feature-test
221 * macros from user land. */
222#define EXT2_SB(sb) (sb)
223
224/*
225 * Feature set definitions
226 */
227#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
228 ( EXT2_SB(sb)->e2fs->e2fs_features_compat & htole32(mask) )
229#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
230 ( EXT2_SB(sb)->e2fs->e2fs_features_rocompat & htole32(mask) )
231#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
232 ( EXT2_SB(sb)->e2fs->e2fs_features_incompat & htole32(mask) )
233
234/*
235 * Definitions of behavior on errors
236 */
237#define E2FS_BEH_CONTINUE 1 /* continue operation */
238#define E2FS_BEH_READONLY 2 /* remount fs read only */
239#define E2FS_BEH_PANIC 3 /* cause panic */
240#define E2FS_BEH_DEFAULT E2FS_BEH_CONTINUE
241
242/*
243 * OS identification
244 */
245#define E2FS_OS_LINUX 0
246#define E2FS_OS_HURD 1
247#define E2FS_OS_MASIX 2
248#define E2FS_OS_FREEBSD 3
249#define E2FS_OS_LITES 4
250
251/*
252 * File clean flags
253 */
254#define E2FS_ISCLEAN 0x0001 /* Unmounted cleanly */
255#define E2FS_ERRORS 0x0002 /* Errors detected */
256
257/* ext2 file system block group descriptor */
258
259struct ext2_gd {
260 uint32_t ext2bgd_b_bitmap; /* blocks bitmap block */
261 uint32_t ext2bgd_i_bitmap; /* inodes bitmap block */
262 uint32_t ext2bgd_i_tables; /* inodes table block */
263 uint16_t ext2bgd_nbfree; /* number of free blocks */
264 uint16_t ext2bgd_nifree; /* number of free inodes */
265 uint16_t ext2bgd_ndirs; /* number of directories */
266 uint16_t reserved;
267 uint32_t reserved2[3];
268};
269
270/* cluster summary information */
271
272struct csum {
273 int8_t cs_init; /* cluster summary has been initialized */
274 int32_t *cs_sum; /* cluster summary array */
275};
276
277/* EXT2FS metadatas are stored in little-endian byte order. These macros
278 * helps reading these metadatas
279 */
280
281#define e2fs_cgload(old, new, size) memcpy((new), (old), (size));
282#define e2fs_cgsave(old, new, size) memcpy((new), (old), (size));
283
284/*
285 * Macro-instructions used to manage several block sizes
286 */
287#define EXT2_MIN_BLOCK_SIZE 1024
288#define EXT2_MAX_BLOCK_SIZE 4096
289#define EXT2_MIN_BLOCK_LOG_SIZE 10
290#if defined(_KERNEL)
291# define EXT2_BLOCK_SIZE(s) ((s)->e2fs_bsize)
292#else
293# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->e2fs_log_bsize)
294#endif
295#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t))
296#if defined(_KERNEL)
297# define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_blocksize_bits)
298#else
299# define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_log_bsize + 10)
300#endif
301#if defined(_KERNEL)
302#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
303#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->e2fs_isize)
304#define EXT2_FIRST_INO(s) (EXT2_SB(s)->e2fs_first_inode)
305#else
306#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == E2FS_REV0) ? \
307 E2FS_REV0 : (s)->s_inode_size)
308#define EXT2_FIRST_INO(s) (((s)->s_rev_level == E2FS_REV0) ? \
309 E2FS_REV0 : (s)->e2fs_first_ino)
310#endif
311
312/*
313 * Macro-instructions used to manage fragments
314 */
315#define EXT2_MIN_FRAG_SIZE 1024
316#define EXT2_MAX_FRAG_SIZE 4096
317#define EXT2_MIN_FRAG_LOG_SIZE 10
318#if defined(_KERNEL)
319# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->e2fs_fsize)
320# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->e2fs_fpb)
321#else
322# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->e2fs_log_fsize)
323# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
324#endif
325
326/*
327 * Macro-instructions used to manage group descriptors
328 */
329#if defined(_KERNEL)
330# define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->e2fs_bpg)
331# define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->e2fs_descpb)
332# define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
333#else
334# define EXT2_BLOCKS_PER_GROUP(s) ((s)->e2fs_bpg)
335# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(struct ext2_gd))
336
337#endif
338
339#endif /* !_FS_EXT2FS_EXT2FS_H_ */
| 180 int32_t e2fs_contigsumsize; /* size of cluster summary array */
181 int32_t *e2fs_maxcluster; /* max cluster in each cyl group */
182 struct csum *e2fs_clustersum; /* cluster summary in each cyl group */
183};
184
185/*
186 * The second extended file system version
187 */
188#define E2FS_DATE "95/08/09"
189#define E2FS_VERSION "0.5b"
190
191/*
192 * The second extended file system magic number
193 */
194#define E2FS_MAGIC 0xEF53
195
196/*
197 * Revision levels
198 */
199#define E2FS_REV0 0 /* The good old (original) format */
200#define E2FS_REV1 1 /* V2 format w/ dynamic inode sizes */
201
202#define E2FS_CURRENT_REV E2FS_REV0
203#define E2FS_MAX_SUPP_REV E2FS_REV1
204
205#define E2FS_REV0_INODE_SIZE 128
206
207/*
208 * compatible/incompatible features
209 */
210#define EXT2F_COMPAT_PREALLOC 0x0001
211#define EXT2F_COMPAT_HASJOURNAL 0x0004
212#define EXT2F_COMPAT_RESIZE 0x0010
213
214#define EXT2F_ROCOMPAT_SPARSESUPER 0x0001
215#define EXT2F_ROCOMPAT_LARGEFILE 0x0002
216#define EXT2F_ROCOMPAT_BTREE_DIR 0x0004
217
218#define EXT2F_INCOMPAT_COMP 0x0001
219#define EXT2F_INCOMPAT_FTYPE 0x0002
220
221/*
222 * Features supported in this implementation
223 *
224 * We support the following REV1 features:
225 * - EXT2F_ROCOMPAT_SPARSESUPER
226 * - EXT2F_ROCOMPAT_LARGEFILE
227 * - EXT2F_INCOMPAT_FTYPE
228 */
229#define EXT2F_COMPAT_SUPP 0x0000
230#define EXT2F_ROCOMPAT_SUPP (EXT2F_ROCOMPAT_SPARSESUPER \
231 | EXT2F_ROCOMPAT_LARGEFILE)
232#define EXT2F_INCOMPAT_SUPP EXT2F_INCOMPAT_FTYPE
233
234/* Assume that user mode programs are passing in an ext2fs superblock, not
235 * a kernel struct super_block. This will allow us to call the feature-test
236 * macros from user land. */
237#define EXT2_SB(sb) (sb)
238
239/*
240 * Feature set definitions
241 */
242#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
243 ( EXT2_SB(sb)->e2fs->e2fs_features_compat & htole32(mask) )
244#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
245 ( EXT2_SB(sb)->e2fs->e2fs_features_rocompat & htole32(mask) )
246#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
247 ( EXT2_SB(sb)->e2fs->e2fs_features_incompat & htole32(mask) )
248
249/*
250 * Definitions of behavior on errors
251 */
252#define E2FS_BEH_CONTINUE 1 /* continue operation */
253#define E2FS_BEH_READONLY 2 /* remount fs read only */
254#define E2FS_BEH_PANIC 3 /* cause panic */
255#define E2FS_BEH_DEFAULT E2FS_BEH_CONTINUE
256
257/*
258 * OS identification
259 */
260#define E2FS_OS_LINUX 0
261#define E2FS_OS_HURD 1
262#define E2FS_OS_MASIX 2
263#define E2FS_OS_FREEBSD 3
264#define E2FS_OS_LITES 4
265
266/*
267 * File clean flags
268 */
269#define E2FS_ISCLEAN 0x0001 /* Unmounted cleanly */
270#define E2FS_ERRORS 0x0002 /* Errors detected */
271
272/* ext2 file system block group descriptor */
273
274struct ext2_gd {
275 uint32_t ext2bgd_b_bitmap; /* blocks bitmap block */
276 uint32_t ext2bgd_i_bitmap; /* inodes bitmap block */
277 uint32_t ext2bgd_i_tables; /* inodes table block */
278 uint16_t ext2bgd_nbfree; /* number of free blocks */
279 uint16_t ext2bgd_nifree; /* number of free inodes */
280 uint16_t ext2bgd_ndirs; /* number of directories */
281 uint16_t reserved;
282 uint32_t reserved2[3];
283};
284
285/* cluster summary information */
286
287struct csum {
288 int8_t cs_init; /* cluster summary has been initialized */
289 int32_t *cs_sum; /* cluster summary array */
290};
291
292/* EXT2FS metadatas are stored in little-endian byte order. These macros
293 * helps reading these metadatas
294 */
295
296#define e2fs_cgload(old, new, size) memcpy((new), (old), (size));
297#define e2fs_cgsave(old, new, size) memcpy((new), (old), (size));
298
299/*
300 * Macro-instructions used to manage several block sizes
301 */
302#define EXT2_MIN_BLOCK_SIZE 1024
303#define EXT2_MAX_BLOCK_SIZE 4096
304#define EXT2_MIN_BLOCK_LOG_SIZE 10
305#if defined(_KERNEL)
306# define EXT2_BLOCK_SIZE(s) ((s)->e2fs_bsize)
307#else
308# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->e2fs_log_bsize)
309#endif
310#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t))
311#if defined(_KERNEL)
312# define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_blocksize_bits)
313#else
314# define EXT2_BLOCK_SIZE_BITS(s) ((s)->e2fs_log_bsize + 10)
315#endif
316#if defined(_KERNEL)
317#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
318#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->e2fs_isize)
319#define EXT2_FIRST_INO(s) (EXT2_SB(s)->e2fs_first_inode)
320#else
321#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == E2FS_REV0) ? \
322 E2FS_REV0 : (s)->s_inode_size)
323#define EXT2_FIRST_INO(s) (((s)->s_rev_level == E2FS_REV0) ? \
324 E2FS_REV0 : (s)->e2fs_first_ino)
325#endif
326
327/*
328 * Macro-instructions used to manage fragments
329 */
330#define EXT2_MIN_FRAG_SIZE 1024
331#define EXT2_MAX_FRAG_SIZE 4096
332#define EXT2_MIN_FRAG_LOG_SIZE 10
333#if defined(_KERNEL)
334# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->e2fs_fsize)
335# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->e2fs_fpb)
336#else
337# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->e2fs_log_fsize)
338# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
339#endif
340
341/*
342 * Macro-instructions used to manage group descriptors
343 */
344#if defined(_KERNEL)
345# define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->e2fs_bpg)
346# define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->e2fs_descpb)
347# define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
348#else
349# define EXT2_BLOCKS_PER_GROUP(s) ((s)->e2fs_bpg)
350# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(struct ext2_gd))
351
352#endif
353
354#endif /* !_FS_EXT2FS_EXT2FS_H_ */
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