1/*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)fs.h 8.13 (Berkeley) 3/21/95
| 1/*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)fs.h 8.13 (Berkeley) 3/21/95
|
34 * $FreeBSD: head/sys/ufs/ffs/fs.h 75503 2001-04-14 05:26:28Z mckusick $
| 34 * $FreeBSD: head/sys/ufs/ffs/fs.h 76357 2001-05-08 07:42:20Z mckusick $
|
35 */
36
37#ifndef _UFS_FFS_FS_H_
38#define _UFS_FFS_FS_H_
39
40/*
41 * Each disk drive contains some number of file systems.
42 * A file system consists of a number of cylinder groups.
43 * Each cylinder group has inodes and data.
44 *
45 * A file system is described by its super-block, which in turn
46 * describes the cylinder groups. The super-block is critical
47 * data and is replicated in each cylinder group to protect against
48 * catastrophic loss. This is done at `newfs' time and the critical
49 * super-block data does not change, so the copies need not be
50 * referenced further unless disaster strikes.
51 *
52 * For file system fs, the offsets of the various blocks of interest
53 * are given in the super block as:
54 * [fs->fs_sblkno] Super-block
55 * [fs->fs_cblkno] Cylinder group block
56 * [fs->fs_iblkno] Inode blocks
57 * [fs->fs_dblkno] Data blocks
58 * The beginning of cylinder group cg in fs, is given by
59 * the ``cgbase(fs, cg)'' macro.
60 *
61 * The first boot and super blocks are given in absolute disk addresses.
62 * The byte-offset forms are preferred, as they don't imply a sector size.
63 */
64#define BBSIZE 8192
65#define SBSIZE 8192
66#define BBOFF ((off_t)(0))
67#define SBOFF ((off_t)(BBOFF + BBSIZE))
68#define BBLOCK ((ufs_daddr_t)(0))
69#define SBLOCK ((ufs_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE))
70
71/*
72 * Addresses stored in inodes are capable of addressing fragments
73 * of `blocks'. File system blocks of at most size MAXBSIZE can
74 * be optionally broken into 2, 4, or 8 pieces, each of which is
75 * addressable; these pieces may be DEV_BSIZE, or some multiple of
76 * a DEV_BSIZE unit.
77 *
78 * Large files consist of exclusively large data blocks. To avoid
79 * undue wasted disk space, the last data block of a small file may be
80 * allocated as only as many fragments of a large block as are
81 * necessary. The file system format retains only a single pointer
82 * to such a fragment, which is a piece of a single large block that
83 * has been divided. The size of such a fragment is determinable from
84 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
85 *
86 * The file system records space availability at the fragment level;
87 * to determine block availability, aligned fragments are examined.
88 */
89
90/*
91 * MINBSIZE is the smallest allowable block size.
92 * In order to insure that it is possible to create files of size
93 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
94 * MINBSIZE must be big enough to hold a cylinder group block,
95 * thus changes to (struct cg) must keep its size within MINBSIZE.
96 * Note that super blocks are always of size SBSIZE,
97 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
98 */
99#define MINBSIZE 4096
100
101/*
102 * The path name on which the file system is mounted is maintained
103 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
104 * the super block for this name.
105 */
106#define MAXMNTLEN 512
107
108/*
109 * There is a 128-byte region in the superblock reserved for in-core
110 * pointers to summary information. Originally this included an array
111 * of pointers to blocks of struct csum; now there are just three
112 * pointers and the remaining space is padded with fs_ocsp[].
113 *
114 * NOCSPTRS determines the size of this padding. One pointer (fs_csp)
115 * is taken away to point to a contiguous array of struct csum for
116 * all cylinder groups; a second (fs_maxcluster) points to an array
117 * of cluster sizes that is computed as cylinder groups are inspected,
118 * and the third points to an array that tracks the creation of new
119 * directories.
120 */
121#define NOCSPTRS ((128 / sizeof(void *)) - 3)
122
123/*
124 * A summary of contiguous blocks of various sizes is maintained
125 * in each cylinder group. Normally this is set by the initial
126 * value of fs_maxcontig. To conserve space, a maximum summary size
127 * is set by FS_MAXCONTIG.
128 */
129#define FS_MAXCONTIG 16
130
131/*
132 * MINFREE gives the minimum acceptable percentage of file system
133 * blocks which may be free. If the freelist drops below this level
134 * only the superuser may continue to allocate blocks. This may
135 * be set to 0 if no reserve of free blocks is deemed necessary,
136 * however throughput drops by fifty percent if the file system
137 * is run at between 95% and 100% full; thus the minimum default
138 * value of fs_minfree is 5%. However, to get good clustering
139 * performance, 10% is a better choice. hence we use 10% as our
140 * default value. With 10% free space, fragmentation is not a
141 * problem, so we choose to optimize for time.
142 */
143#define MINFREE 8
144#define DEFAULTOPT FS_OPTTIME
145
146/*
147 * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine
148 * tune the layout preferences for directories within a filesystem.
149 * His algorithm can be tuned by adjusting the following parameters
150 * which tell the system the average file size and the average number
151 * of files per directory. These defaults are well selected for typical
152 * filesystems, but may need to be tuned for odd cases like filesystems
153 * being used for sqiud caches or news spools.
154 */
155#define AVFILESIZ 16384 /* expected average file size */
156#define AFPDIR 64 /* expected number of files per directory */
157
158/*
159 * The maximum number of snapshot nodes that can be associated
160 * with each filesystem. This limit affects only the number of
161 * snapshot files that can be recorded within the superblock so
162 * that they can be found when the filesystem is mounted. However,
163 * maintaining too many will slow the filesystem performance, so
164 * having this limit is a good idea.
165 */
166#define FSMAXSNAP 20
167
168/*
169 * Used to identify special blocks in snapshots:
170 *
171 * BLK_NOCOPY - A block that was unallocated at the time the snapshot
172 * was taken, hence does not need to be copied when written.
173 * BLK_SNAP - A block held by another snapshot that is not needed by this
174 * snapshot. When the other snapshot is freed, the BLK_SNAP entries
175 * are converted to BLK_NOCOPY. These are needed to allow fsck to
176 * identify blocks that are in use by other snapshots (which are
177 * expunged from this snapshot).
178 */
179#define BLK_NOCOPY ((ufs_daddr_t)(1))
180#define BLK_SNAP ((ufs_daddr_t)(2))
181
182/*
183 * Sysctl values for the fast filesystem.
184 */
185#define FFS_ADJ_REFCNT 1 /* adjust inode reference count */
186#define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */
187#define FFS_BLK_FREE 3 /* free range of blocks in map */
188#define FFS_DIR_FREE 4 /* free specified dir inodes in map */
189#define FFS_FILE_FREE 5 /* free specified file inodes in map */
190#define FFS_SET_FLAGS 6 /* set filesystem flags */
191#define FFS_MAXID 7 /* number of valid ffs ids */
192
193/*
194 * Command structure passed in to the filesystem to adjust filesystem values.
195 */
196#define FFS_CMD_VERSION 0x05181979 /* version ID */
197struct fsck_cmd {
198 int version; /* version of command structure */
199 int handle; /* reference to filesystem to be changed */
200 off_t value; /* inode or block number to be affected */
201 long size; /* amount or range to be adjusted */
202};
203
204/*
205 * Per cylinder group information; summarized in blocks allocated
206 * from first cylinder group data blocks. These blocks have to be
207 * read in from fs_csaddr (size fs_cssize) in addition to the
208 * super block.
209 */
210struct csum {
211 int32_t cs_ndir; /* number of directories */
212 int32_t cs_nbfree; /* number of free blocks */
213 int32_t cs_nifree; /* number of free inodes */
214 int32_t cs_nffree; /* number of free frags */
215};
216
217/*
218 * Super block for an FFS file system.
219 */
220struct fs {
221 int32_t fs_firstfield; /* historic file system linked list, */
222 int32_t fs_unused_1; /* used for incore super blocks */
223 ufs_daddr_t fs_sblkno; /* addr of super-block in filesys */
224 ufs_daddr_t fs_cblkno; /* offset of cyl-block in filesys */
225 ufs_daddr_t fs_iblkno; /* offset of inode-blocks in filesys */
226 ufs_daddr_t fs_dblkno; /* offset of first data after cg */
227 int32_t fs_cgoffset; /* cylinder group offset in cylinder */
228 int32_t fs_cgmask; /* used to calc mod fs_ntrak */
229 time_t fs_time; /* last time written */
230 int32_t fs_size; /* number of blocks in fs */
231 int32_t fs_dsize; /* number of data blocks in fs */
232 int32_t fs_ncg; /* number of cylinder groups */
233 int32_t fs_bsize; /* size of basic blocks in fs */
234 int32_t fs_fsize; /* size of frag blocks in fs */
235 int32_t fs_frag; /* number of frags in a block in fs */
236/* these are configuration parameters */
237 int32_t fs_minfree; /* minimum percentage of free blocks */
238 int32_t fs_rotdelay; /* num of ms for optimal next block */
239 int32_t fs_rps; /* disk revolutions per second */
240/* these fields can be computed from the others */
241 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
242 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
243 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
244 int32_t fs_fshift; /* ``numfrags'' calc number of frags */
245/* these are configuration parameters */
246 int32_t fs_maxcontig; /* max number of contiguous blks */
247 int32_t fs_maxbpg; /* max number of blks per cyl group */
248/* these fields can be computed from the others */
249 int32_t fs_fragshift; /* block to frag shift */
250 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
251 int32_t fs_sbsize; /* actual size of super block */
252 int32_t fs_csmask; /* csum block offset (now unused) */
253 int32_t fs_csshift; /* csum block number (now unused) */
254 int32_t fs_nindir; /* value of NINDIR */
255 int32_t fs_inopb; /* value of INOPB */
256 int32_t fs_nspf; /* value of NSPF */
257/* yet another configuration parameter */
258 int32_t fs_optim; /* optimization preference, see below */
259/* these fields are derived from the hardware */
260 int32_t fs_npsect; /* # sectors/track including spares */
261 int32_t fs_interleave; /* hardware sector interleave */
262 int32_t fs_trackskew; /* sector 0 skew, per track */
263/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
264 int32_t fs_id[2]; /* unique filesystem id */
265/* sizes determined by number of cylinder groups and their sizes */
266 ufs_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */
267 int32_t fs_cssize; /* size of cyl grp summary area */
268 int32_t fs_cgsize; /* cylinder group size */
269/* these fields are derived from the hardware */
270 int32_t fs_ntrak; /* tracks per cylinder */
271 int32_t fs_nsect; /* sectors per track */
272 int32_t fs_spc; /* sectors per cylinder */
273/* this comes from the disk driver partitioning */
274 int32_t fs_ncyl; /* cylinders in file system */
275/* these fields can be computed from the others */
276 int32_t fs_cpg; /* cylinders per group */
277 int32_t fs_ipg; /* inodes per group */
278 int32_t fs_fpg; /* blocks per group * fs_frag */
279/* this data must be re-computed after crashes */
280 struct csum fs_cstotal; /* cylinder summary information */
281/* these fields are cleared at mount time */
282 int8_t fs_fmod; /* super block modified flag */
283 int8_t fs_clean; /* file system is clean flag */
284 int8_t fs_ronly; /* mounted read-only flag */
285 int8_t fs_flags; /* see FS_ flags below */
286 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
287/* these fields retain the current block allocation info */
288 int32_t fs_cgrotor; /* last cg searched */
289 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
290 u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */
291 struct csum *fs_csp; /* cg summary info buffer for fs_cs */
292 int32_t *fs_maxcluster; /* max cluster in each cyl group */
293 int32_t fs_cpc; /* cyl per cycle in postbl */
294 int16_t fs_opostbl[16][8]; /* old rotation block list head */
295 int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
296 int32_t fs_avgfilesize; /* expected average file size */
297 int32_t fs_avgfpdir; /* expected # of files per directory */
| 35 */
36
37#ifndef _UFS_FFS_FS_H_
38#define _UFS_FFS_FS_H_
39
40/*
41 * Each disk drive contains some number of file systems.
42 * A file system consists of a number of cylinder groups.
43 * Each cylinder group has inodes and data.
44 *
45 * A file system is described by its super-block, which in turn
46 * describes the cylinder groups. The super-block is critical
47 * data and is replicated in each cylinder group to protect against
48 * catastrophic loss. This is done at `newfs' time and the critical
49 * super-block data does not change, so the copies need not be
50 * referenced further unless disaster strikes.
51 *
52 * For file system fs, the offsets of the various blocks of interest
53 * are given in the super block as:
54 * [fs->fs_sblkno] Super-block
55 * [fs->fs_cblkno] Cylinder group block
56 * [fs->fs_iblkno] Inode blocks
57 * [fs->fs_dblkno] Data blocks
58 * The beginning of cylinder group cg in fs, is given by
59 * the ``cgbase(fs, cg)'' macro.
60 *
61 * The first boot and super blocks are given in absolute disk addresses.
62 * The byte-offset forms are preferred, as they don't imply a sector size.
63 */
64#define BBSIZE 8192
65#define SBSIZE 8192
66#define BBOFF ((off_t)(0))
67#define SBOFF ((off_t)(BBOFF + BBSIZE))
68#define BBLOCK ((ufs_daddr_t)(0))
69#define SBLOCK ((ufs_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE))
70
71/*
72 * Addresses stored in inodes are capable of addressing fragments
73 * of `blocks'. File system blocks of at most size MAXBSIZE can
74 * be optionally broken into 2, 4, or 8 pieces, each of which is
75 * addressable; these pieces may be DEV_BSIZE, or some multiple of
76 * a DEV_BSIZE unit.
77 *
78 * Large files consist of exclusively large data blocks. To avoid
79 * undue wasted disk space, the last data block of a small file may be
80 * allocated as only as many fragments of a large block as are
81 * necessary. The file system format retains only a single pointer
82 * to such a fragment, which is a piece of a single large block that
83 * has been divided. The size of such a fragment is determinable from
84 * information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
85 *
86 * The file system records space availability at the fragment level;
87 * to determine block availability, aligned fragments are examined.
88 */
89
90/*
91 * MINBSIZE is the smallest allowable block size.
92 * In order to insure that it is possible to create files of size
93 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
94 * MINBSIZE must be big enough to hold a cylinder group block,
95 * thus changes to (struct cg) must keep its size within MINBSIZE.
96 * Note that super blocks are always of size SBSIZE,
97 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
98 */
99#define MINBSIZE 4096
100
101/*
102 * The path name on which the file system is mounted is maintained
103 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
104 * the super block for this name.
105 */
106#define MAXMNTLEN 512
107
108/*
109 * There is a 128-byte region in the superblock reserved for in-core
110 * pointers to summary information. Originally this included an array
111 * of pointers to blocks of struct csum; now there are just three
112 * pointers and the remaining space is padded with fs_ocsp[].
113 *
114 * NOCSPTRS determines the size of this padding. One pointer (fs_csp)
115 * is taken away to point to a contiguous array of struct csum for
116 * all cylinder groups; a second (fs_maxcluster) points to an array
117 * of cluster sizes that is computed as cylinder groups are inspected,
118 * and the third points to an array that tracks the creation of new
119 * directories.
120 */
121#define NOCSPTRS ((128 / sizeof(void *)) - 3)
122
123/*
124 * A summary of contiguous blocks of various sizes is maintained
125 * in each cylinder group. Normally this is set by the initial
126 * value of fs_maxcontig. To conserve space, a maximum summary size
127 * is set by FS_MAXCONTIG.
128 */
129#define FS_MAXCONTIG 16
130
131/*
132 * MINFREE gives the minimum acceptable percentage of file system
133 * blocks which may be free. If the freelist drops below this level
134 * only the superuser may continue to allocate blocks. This may
135 * be set to 0 if no reserve of free blocks is deemed necessary,
136 * however throughput drops by fifty percent if the file system
137 * is run at between 95% and 100% full; thus the minimum default
138 * value of fs_minfree is 5%. However, to get good clustering
139 * performance, 10% is a better choice. hence we use 10% as our
140 * default value. With 10% free space, fragmentation is not a
141 * problem, so we choose to optimize for time.
142 */
143#define MINFREE 8
144#define DEFAULTOPT FS_OPTTIME
145
146/*
147 * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine
148 * tune the layout preferences for directories within a filesystem.
149 * His algorithm can be tuned by adjusting the following parameters
150 * which tell the system the average file size and the average number
151 * of files per directory. These defaults are well selected for typical
152 * filesystems, but may need to be tuned for odd cases like filesystems
153 * being used for sqiud caches or news spools.
154 */
155#define AVFILESIZ 16384 /* expected average file size */
156#define AFPDIR 64 /* expected number of files per directory */
157
158/*
159 * The maximum number of snapshot nodes that can be associated
160 * with each filesystem. This limit affects only the number of
161 * snapshot files that can be recorded within the superblock so
162 * that they can be found when the filesystem is mounted. However,
163 * maintaining too many will slow the filesystem performance, so
164 * having this limit is a good idea.
165 */
166#define FSMAXSNAP 20
167
168/*
169 * Used to identify special blocks in snapshots:
170 *
171 * BLK_NOCOPY - A block that was unallocated at the time the snapshot
172 * was taken, hence does not need to be copied when written.
173 * BLK_SNAP - A block held by another snapshot that is not needed by this
174 * snapshot. When the other snapshot is freed, the BLK_SNAP entries
175 * are converted to BLK_NOCOPY. These are needed to allow fsck to
176 * identify blocks that are in use by other snapshots (which are
177 * expunged from this snapshot).
178 */
179#define BLK_NOCOPY ((ufs_daddr_t)(1))
180#define BLK_SNAP ((ufs_daddr_t)(2))
181
182/*
183 * Sysctl values for the fast filesystem.
184 */
185#define FFS_ADJ_REFCNT 1 /* adjust inode reference count */
186#define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */
187#define FFS_BLK_FREE 3 /* free range of blocks in map */
188#define FFS_DIR_FREE 4 /* free specified dir inodes in map */
189#define FFS_FILE_FREE 5 /* free specified file inodes in map */
190#define FFS_SET_FLAGS 6 /* set filesystem flags */
191#define FFS_MAXID 7 /* number of valid ffs ids */
192
193/*
194 * Command structure passed in to the filesystem to adjust filesystem values.
195 */
196#define FFS_CMD_VERSION 0x05181979 /* version ID */
197struct fsck_cmd {
198 int version; /* version of command structure */
199 int handle; /* reference to filesystem to be changed */
200 off_t value; /* inode or block number to be affected */
201 long size; /* amount or range to be adjusted */
202};
203
204/*
205 * Per cylinder group information; summarized in blocks allocated
206 * from first cylinder group data blocks. These blocks have to be
207 * read in from fs_csaddr (size fs_cssize) in addition to the
208 * super block.
209 */
210struct csum {
211 int32_t cs_ndir; /* number of directories */
212 int32_t cs_nbfree; /* number of free blocks */
213 int32_t cs_nifree; /* number of free inodes */
214 int32_t cs_nffree; /* number of free frags */
215};
216
217/*
218 * Super block for an FFS file system.
219 */
220struct fs {
221 int32_t fs_firstfield; /* historic file system linked list, */
222 int32_t fs_unused_1; /* used for incore super blocks */
223 ufs_daddr_t fs_sblkno; /* addr of super-block in filesys */
224 ufs_daddr_t fs_cblkno; /* offset of cyl-block in filesys */
225 ufs_daddr_t fs_iblkno; /* offset of inode-blocks in filesys */
226 ufs_daddr_t fs_dblkno; /* offset of first data after cg */
227 int32_t fs_cgoffset; /* cylinder group offset in cylinder */
228 int32_t fs_cgmask; /* used to calc mod fs_ntrak */
229 time_t fs_time; /* last time written */
230 int32_t fs_size; /* number of blocks in fs */
231 int32_t fs_dsize; /* number of data blocks in fs */
232 int32_t fs_ncg; /* number of cylinder groups */
233 int32_t fs_bsize; /* size of basic blocks in fs */
234 int32_t fs_fsize; /* size of frag blocks in fs */
235 int32_t fs_frag; /* number of frags in a block in fs */
236/* these are configuration parameters */
237 int32_t fs_minfree; /* minimum percentage of free blocks */
238 int32_t fs_rotdelay; /* num of ms for optimal next block */
239 int32_t fs_rps; /* disk revolutions per second */
240/* these fields can be computed from the others */
241 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
242 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
243 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
244 int32_t fs_fshift; /* ``numfrags'' calc number of frags */
245/* these are configuration parameters */
246 int32_t fs_maxcontig; /* max number of contiguous blks */
247 int32_t fs_maxbpg; /* max number of blks per cyl group */
248/* these fields can be computed from the others */
249 int32_t fs_fragshift; /* block to frag shift */
250 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
251 int32_t fs_sbsize; /* actual size of super block */
252 int32_t fs_csmask; /* csum block offset (now unused) */
253 int32_t fs_csshift; /* csum block number (now unused) */
254 int32_t fs_nindir; /* value of NINDIR */
255 int32_t fs_inopb; /* value of INOPB */
256 int32_t fs_nspf; /* value of NSPF */
257/* yet another configuration parameter */
258 int32_t fs_optim; /* optimization preference, see below */
259/* these fields are derived from the hardware */
260 int32_t fs_npsect; /* # sectors/track including spares */
261 int32_t fs_interleave; /* hardware sector interleave */
262 int32_t fs_trackskew; /* sector 0 skew, per track */
263/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
264 int32_t fs_id[2]; /* unique filesystem id */
265/* sizes determined by number of cylinder groups and their sizes */
266 ufs_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */
267 int32_t fs_cssize; /* size of cyl grp summary area */
268 int32_t fs_cgsize; /* cylinder group size */
269/* these fields are derived from the hardware */
270 int32_t fs_ntrak; /* tracks per cylinder */
271 int32_t fs_nsect; /* sectors per track */
272 int32_t fs_spc; /* sectors per cylinder */
273/* this comes from the disk driver partitioning */
274 int32_t fs_ncyl; /* cylinders in file system */
275/* these fields can be computed from the others */
276 int32_t fs_cpg; /* cylinders per group */
277 int32_t fs_ipg; /* inodes per group */
278 int32_t fs_fpg; /* blocks per group * fs_frag */
279/* this data must be re-computed after crashes */
280 struct csum fs_cstotal; /* cylinder summary information */
281/* these fields are cleared at mount time */
282 int8_t fs_fmod; /* super block modified flag */
283 int8_t fs_clean; /* file system is clean flag */
284 int8_t fs_ronly; /* mounted read-only flag */
285 int8_t fs_flags; /* see FS_ flags below */
286 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
287/* these fields retain the current block allocation info */
288 int32_t fs_cgrotor; /* last cg searched */
289 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
290 u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */
291 struct csum *fs_csp; /* cg summary info buffer for fs_cs */
292 int32_t *fs_maxcluster; /* max cluster in each cyl group */
293 int32_t fs_cpc; /* cyl per cycle in postbl */
294 int16_t fs_opostbl[16][8]; /* old rotation block list head */
295 int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
296 int32_t fs_avgfilesize; /* expected average file size */
297 int32_t fs_avgfpdir; /* expected # of files per directory */
|
298 int32_t fs_sparecon[28]; /* reserved for future constants */
| 298 int32_t fs_sparecon[26]; /* reserved for future constants */
299 int32_t fs_pendingblocks; /* blocks in process of being freed */
300 int32_t fs_pendinginodes; /* inodes in process of being freed */
|
299 int32_t fs_contigsumsize; /* size of cluster summary array */
300 int32_t fs_maxsymlinklen; /* max length of an internal symlink */
301 int32_t fs_inodefmt; /* format of on-disk inodes */
302 u_int64_t fs_maxfilesize; /* maximum representable file size */
303 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
304 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
305 int32_t fs_state; /* validate fs_clean field */
306 int32_t fs_postblformat; /* format of positional layout tables */
307 int32_t fs_nrpos; /* number of rotational positions */
308 int32_t fs_postbloff; /* (u_int16) rotation block list head */
309 int32_t fs_rotbloff; /* (u_int8) blocks for each rotation */
310 int32_t fs_magic; /* magic number */
311 u_int8_t fs_space[1]; /* list of blocks for each rotation */
312/* actually longer */
313};
314
315/*
316 * Filesystem identification
317 */
318#define FS_MAGIC 0x011954 /* the fast filesystem magic number */
319#define FS_OKAY 0x7c269d38 /* superblock checksum */
320#define FS_42INODEFMT -1 /* 4.2BSD inode format */
321#define FS_44INODEFMT 2 /* 4.4BSD inode format */
322
323/*
324 * Preference for optimization.
325 */
326#define FS_OPTTIME 0 /* minimize allocation time */
327#define FS_OPTSPACE 1 /* minimize disk fragmentation */
328
329/*
330 * Filesystem flags.
331 *
332 * Note that the FS_NEEDSFSCK flag is set and cleared only by the
333 * fsck utility. It is set when background fsck finds an unexpected
334 * inconsistency which requires a traditional foreground fsck to be
335 * run. Such inconsistencies should only be found after an uncorrectable
336 * disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when
337 * it has successfully cleaned up the filesystem. The kernel uses this
338 * flag to enforce that inconsistent filesystems be mounted read-only.
339 */
340#define FS_UNCLEAN 0x01 /* filesystem not clean at mount */
341#define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */
342#define FS_NEEDSFSCK 0x04 /* filesystem needs sync fsck before mount */
343
344/*
345 * Rotational layout table format types
346 */
347#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */
348#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
349/*
350 * Macros for access to superblock array structures
351 */
352#define fs_postbl(fs, cylno) \
353 (((fs)->fs_postblformat == FS_42POSTBLFMT) \
354 ? ((fs)->fs_opostbl[cylno]) \
355 : ((int16_t *)((u_int8_t *)(fs) + \
356 (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos))
357#define fs_rotbl(fs) \
358 (((fs)->fs_postblformat == FS_42POSTBLFMT) \
359 ? ((fs)->fs_space) \
360 : ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff)))
361
362/*
363 * The size of a cylinder group is calculated by CGSIZE. The maximum size
364 * is limited by the fact that cylinder groups are at most one block.
365 * Its size is derived from the size of the maps maintained in the
366 * cylinder group and the (struct cg) size.
367 */
368#define CGSIZE(fs) \
369 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
370 /* blktot size */ (fs)->fs_cpg * sizeof(int32_t) + \
371 /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \
372 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \
373 /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\
374 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
375 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
376 /* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY)))
377
378/*
379 * Convert cylinder group to base address of its global summary info.
380 */
381#define fs_cs(fs, indx) fs_csp[indx]
382
383/*
384 * Cylinder group block for a file system.
385 */
386#define CG_MAGIC 0x090255
387struct cg {
388 int32_t cg_firstfield; /* historic cyl groups linked list */
389 int32_t cg_magic; /* magic number */
390 time_t cg_time; /* time last written */
391 int32_t cg_cgx; /* we are the cgx'th cylinder group */
392 int16_t cg_ncyl; /* number of cyl's this cg */
393 int16_t cg_niblk; /* number of inode blocks this cg */
394 int32_t cg_ndblk; /* number of data blocks this cg */
395 struct csum cg_cs; /* cylinder summary information */
396 int32_t cg_rotor; /* position of last used block */
397 int32_t cg_frotor; /* position of last used frag */
398 int32_t cg_irotor; /* position of last used inode */
399 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
400 int32_t cg_btotoff; /* (int32) block totals per cylinder */
401 int32_t cg_boff; /* (u_int16) free block positions */
402 int32_t cg_iusedoff; /* (u_int8) used inode map */
403 int32_t cg_freeoff; /* (u_int8) free block map */
404 int32_t cg_nextfreeoff; /* (u_int8) next available space */
405 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
406 int32_t cg_clusteroff; /* (u_int8) free cluster map */
407 int32_t cg_nclusterblks; /* number of clusters this cg */
408 int32_t cg_sparecon[13]; /* reserved for future use */
409 u_int8_t cg_space[1]; /* space for cylinder group maps */
410/* actually longer */
411};
412
413/*
414 * Macros for access to cylinder group array structures
415 */
416#define cg_blktot(cgp) \
417 (((cgp)->cg_magic != CG_MAGIC) \
418 ? (((struct ocg *)(cgp))->cg_btot) \
419 : ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff)))
420#define cg_blks(fs, cgp, cylno) \
421 (((cgp)->cg_magic != CG_MAGIC) \
422 ? (((struct ocg *)(cgp))->cg_b[cylno]) \
423 : ((int16_t *)((u_int8_t *)(cgp) + \
424 (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos))
425#define cg_inosused(cgp) \
426 (((cgp)->cg_magic != CG_MAGIC) \
427 ? (((struct ocg *)(cgp))->cg_iused) \
428 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff)))
429#define cg_blksfree(cgp) \
430 (((cgp)->cg_magic != CG_MAGIC) \
431 ? (((struct ocg *)(cgp))->cg_free) \
432 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff)))
433#define cg_chkmagic(cgp) \
434 ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC)
435#define cg_clustersfree(cgp) \
436 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff))
437#define cg_clustersum(cgp) \
438 ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff))
439
440/*
441 * The following structure is defined
442 * for compatibility with old file systems.
443 */
444struct ocg {
445 int32_t cg_firstfield; /* historic linked list of cyl groups */
446 int32_t cg_unused_1; /* used for incore cyl groups */
447 time_t cg_time; /* time last written */
448 int32_t cg_cgx; /* we are the cgx'th cylinder group */
449 int16_t cg_ncyl; /* number of cyl's this cg */
450 int16_t cg_niblk; /* number of inode blocks this cg */
451 int32_t cg_ndblk; /* number of data blocks this cg */
452 struct csum cg_cs; /* cylinder summary information */
453 int32_t cg_rotor; /* position of last used block */
454 int32_t cg_frotor; /* position of last used frag */
455 int32_t cg_irotor; /* position of last used inode */
456 int32_t cg_frsum[8]; /* counts of available frags */
457 int32_t cg_btot[32]; /* block totals per cylinder */
458 int16_t cg_b[32][8]; /* positions of free blocks */
459 u_int8_t cg_iused[256]; /* used inode map */
460 int32_t cg_magic; /* magic number */
461 u_int8_t cg_free[1]; /* free block map */
462/* actually longer */
463};
464
465/*
466 * Turn file system block numbers into disk block addresses.
467 * This maps file system blocks to device size blocks.
468 */
469#define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb)
470#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
471
472/*
473 * Cylinder group macros to locate things in cylinder groups.
474 * They calc file system addresses of cylinder group data structures.
475 */
476#define cgbase(fs, c) ((ufs_daddr_t)((fs)->fs_fpg * (c)))
477#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */
478#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
479#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
480#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
481#define cgstart(fs, c) \
482 (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask)))
483
484/*
485 * Macros for handling inode numbers:
486 * inode number to file system block offset.
487 * inode number to cylinder group number.
488 * inode number to file system block address.
489 */
490#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
491#define ino_to_fsba(fs, x) \
492 ((ufs_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
493 (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
494#define ino_to_fsbo(fs, x) ((x) % INOPB(fs))
495
496/*
497 * Give cylinder group number for a file system block.
498 * Give cylinder group block number for a file system block.
499 */
500#define dtog(fs, d) ((d) / (fs)->fs_fpg)
501#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
502
503/*
504 * Extract the bits for a block from a map.
505 * Compute the cylinder and rotational position of a cyl block addr.
506 */
507#define blkmap(fs, map, loc) \
508 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
509#define cbtocylno(fs, bno) \
510 ((bno) * NSPF(fs) / (fs)->fs_spc)
511#define cbtorpos(fs, bno) \
512 (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \
513 (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \
514 (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect)
515
516/*
517 * The following macros optimize certain frequently calculated
518 * quantities by using shifts and masks in place of divisions
519 * modulos and multiplications.
520 */
521#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
522 ((loc) & (fs)->fs_qbmask)
523#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
524 ((loc) & (fs)->fs_qfmask)
525#define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \
526 ((off_t)(blk) << (fs)->fs_bshift)
527/* Use this only when `blk' is known to be small, e.g., < NDADDR. */
528#define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \
529 ((blk) << (fs)->fs_bshift)
530#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
531 ((loc) >> (fs)->fs_bshift)
532#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
533 ((loc) >> (fs)->fs_fshift)
534#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
535 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
536#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
537 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
538#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
539 ((frags) >> (fs)->fs_fragshift)
540#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
541 ((blks) << (fs)->fs_fragshift)
542#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
543 ((fsb) & ((fs)->fs_frag - 1))
544#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
545 ((fsb) &~ ((fs)->fs_frag - 1))
546
547/*
548 * Determine the number of available frags given a
549 * percentage to hold in reserve.
550 */
551#define freespace(fs, percentreserved) \
552 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
553 (fs)->fs_cstotal.cs_nffree - \
554 ((off_t)((fs)->fs_dsize) * (percentreserved) / 100))
555
556/*
557 * Determining the size of a file block in the file system.
558 */
559#define blksize(fs, ip, lbn) \
560 (((lbn) >= NDADDR || (ip)->i_size >= smalllblktosize(fs, (lbn) + 1)) \
561 ? (fs)->fs_bsize \
562 : (fragroundup(fs, blkoff(fs, (ip)->i_size))))
563#define dblksize(fs, dip, lbn) \
564 (((lbn) >= NDADDR || \
565 (dip)->di_size >= (u_int64_t)smalllblktosize(fs, (lbn) + 1)) \
566 ? (fs)->fs_bsize \
567 : (fragroundup(fs, blkoff(fs, (dip)->di_size))))
568#define sblksize(fs, size, lbn) \
569 (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
570 ? (fs)->fs_bsize \
571 : (fragroundup(fs, blkoff(fs, (size)))))
572
573
574/*
575 * Number of disk sectors per block/fragment; assumes DEV_BSIZE byte
576 * sector size.
577 */
578#define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift)
579#define NSPF(fs) ((fs)->fs_nspf)
580
581/*
582 * Number of inodes in a secondary storage block/fragment.
583 */
584#define INOPB(fs) ((fs)->fs_inopb)
585#define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
586
587/*
588 * Number of indirects in a file system block.
589 */
590#define NINDIR(fs) ((fs)->fs_nindir)
591
592extern int inside[], around[];
593extern u_char *fragtbl[];
594
595#endif
| 301 int32_t fs_contigsumsize; /* size of cluster summary array */
302 int32_t fs_maxsymlinklen; /* max length of an internal symlink */
303 int32_t fs_inodefmt; /* format of on-disk inodes */
304 u_int64_t fs_maxfilesize; /* maximum representable file size */
305 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
306 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
307 int32_t fs_state; /* validate fs_clean field */
308 int32_t fs_postblformat; /* format of positional layout tables */
309 int32_t fs_nrpos; /* number of rotational positions */
310 int32_t fs_postbloff; /* (u_int16) rotation block list head */
311 int32_t fs_rotbloff; /* (u_int8) blocks for each rotation */
312 int32_t fs_magic; /* magic number */
313 u_int8_t fs_space[1]; /* list of blocks for each rotation */
314/* actually longer */
315};
316
317/*
318 * Filesystem identification
319 */
320#define FS_MAGIC 0x011954 /* the fast filesystem magic number */
321#define FS_OKAY 0x7c269d38 /* superblock checksum */
322#define FS_42INODEFMT -1 /* 4.2BSD inode format */
323#define FS_44INODEFMT 2 /* 4.4BSD inode format */
324
325/*
326 * Preference for optimization.
327 */
328#define FS_OPTTIME 0 /* minimize allocation time */
329#define FS_OPTSPACE 1 /* minimize disk fragmentation */
330
331/*
332 * Filesystem flags.
333 *
334 * Note that the FS_NEEDSFSCK flag is set and cleared only by the
335 * fsck utility. It is set when background fsck finds an unexpected
336 * inconsistency which requires a traditional foreground fsck to be
337 * run. Such inconsistencies should only be found after an uncorrectable
338 * disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when
339 * it has successfully cleaned up the filesystem. The kernel uses this
340 * flag to enforce that inconsistent filesystems be mounted read-only.
341 */
342#define FS_UNCLEAN 0x01 /* filesystem not clean at mount */
343#define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */
344#define FS_NEEDSFSCK 0x04 /* filesystem needs sync fsck before mount */
345
346/*
347 * Rotational layout table format types
348 */
349#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */
350#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
351/*
352 * Macros for access to superblock array structures
353 */
354#define fs_postbl(fs, cylno) \
355 (((fs)->fs_postblformat == FS_42POSTBLFMT) \
356 ? ((fs)->fs_opostbl[cylno]) \
357 : ((int16_t *)((u_int8_t *)(fs) + \
358 (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos))
359#define fs_rotbl(fs) \
360 (((fs)->fs_postblformat == FS_42POSTBLFMT) \
361 ? ((fs)->fs_space) \
362 : ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff)))
363
364/*
365 * The size of a cylinder group is calculated by CGSIZE. The maximum size
366 * is limited by the fact that cylinder groups are at most one block.
367 * Its size is derived from the size of the maps maintained in the
368 * cylinder group and the (struct cg) size.
369 */
370#define CGSIZE(fs) \
371 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
372 /* blktot size */ (fs)->fs_cpg * sizeof(int32_t) + \
373 /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \
374 /* inode map */ howmany((fs)->fs_ipg, NBBY) + \
375 /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\
376 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
377 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
378 /* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY)))
379
380/*
381 * Convert cylinder group to base address of its global summary info.
382 */
383#define fs_cs(fs, indx) fs_csp[indx]
384
385/*
386 * Cylinder group block for a file system.
387 */
388#define CG_MAGIC 0x090255
389struct cg {
390 int32_t cg_firstfield; /* historic cyl groups linked list */
391 int32_t cg_magic; /* magic number */
392 time_t cg_time; /* time last written */
393 int32_t cg_cgx; /* we are the cgx'th cylinder group */
394 int16_t cg_ncyl; /* number of cyl's this cg */
395 int16_t cg_niblk; /* number of inode blocks this cg */
396 int32_t cg_ndblk; /* number of data blocks this cg */
397 struct csum cg_cs; /* cylinder summary information */
398 int32_t cg_rotor; /* position of last used block */
399 int32_t cg_frotor; /* position of last used frag */
400 int32_t cg_irotor; /* position of last used inode */
401 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
402 int32_t cg_btotoff; /* (int32) block totals per cylinder */
403 int32_t cg_boff; /* (u_int16) free block positions */
404 int32_t cg_iusedoff; /* (u_int8) used inode map */
405 int32_t cg_freeoff; /* (u_int8) free block map */
406 int32_t cg_nextfreeoff; /* (u_int8) next available space */
407 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
408 int32_t cg_clusteroff; /* (u_int8) free cluster map */
409 int32_t cg_nclusterblks; /* number of clusters this cg */
410 int32_t cg_sparecon[13]; /* reserved for future use */
411 u_int8_t cg_space[1]; /* space for cylinder group maps */
412/* actually longer */
413};
414
415/*
416 * Macros for access to cylinder group array structures
417 */
418#define cg_blktot(cgp) \
419 (((cgp)->cg_magic != CG_MAGIC) \
420 ? (((struct ocg *)(cgp))->cg_btot) \
421 : ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff)))
422#define cg_blks(fs, cgp, cylno) \
423 (((cgp)->cg_magic != CG_MAGIC) \
424 ? (((struct ocg *)(cgp))->cg_b[cylno]) \
425 : ((int16_t *)((u_int8_t *)(cgp) + \
426 (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos))
427#define cg_inosused(cgp) \
428 (((cgp)->cg_magic != CG_MAGIC) \
429 ? (((struct ocg *)(cgp))->cg_iused) \
430 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff)))
431#define cg_blksfree(cgp) \
432 (((cgp)->cg_magic != CG_MAGIC) \
433 ? (((struct ocg *)(cgp))->cg_free) \
434 : ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff)))
435#define cg_chkmagic(cgp) \
436 ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC)
437#define cg_clustersfree(cgp) \
438 ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff))
439#define cg_clustersum(cgp) \
440 ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff))
441
442/*
443 * The following structure is defined
444 * for compatibility with old file systems.
445 */
446struct ocg {
447 int32_t cg_firstfield; /* historic linked list of cyl groups */
448 int32_t cg_unused_1; /* used for incore cyl groups */
449 time_t cg_time; /* time last written */
450 int32_t cg_cgx; /* we are the cgx'th cylinder group */
451 int16_t cg_ncyl; /* number of cyl's this cg */
452 int16_t cg_niblk; /* number of inode blocks this cg */
453 int32_t cg_ndblk; /* number of data blocks this cg */
454 struct csum cg_cs; /* cylinder summary information */
455 int32_t cg_rotor; /* position of last used block */
456 int32_t cg_frotor; /* position of last used frag */
457 int32_t cg_irotor; /* position of last used inode */
458 int32_t cg_frsum[8]; /* counts of available frags */
459 int32_t cg_btot[32]; /* block totals per cylinder */
460 int16_t cg_b[32][8]; /* positions of free blocks */
461 u_int8_t cg_iused[256]; /* used inode map */
462 int32_t cg_magic; /* magic number */
463 u_int8_t cg_free[1]; /* free block map */
464/* actually longer */
465};
466
467/*
468 * Turn file system block numbers into disk block addresses.
469 * This maps file system blocks to device size blocks.
470 */
471#define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb)
472#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
473
474/*
475 * Cylinder group macros to locate things in cylinder groups.
476 * They calc file system addresses of cylinder group data structures.
477 */
478#define cgbase(fs, c) ((ufs_daddr_t)((fs)->fs_fpg * (c)))
479#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */
480#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
481#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
482#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
483#define cgstart(fs, c) \
484 (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask)))
485
486/*
487 * Macros for handling inode numbers:
488 * inode number to file system block offset.
489 * inode number to cylinder group number.
490 * inode number to file system block address.
491 */
492#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
493#define ino_to_fsba(fs, x) \
494 ((ufs_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
495 (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
496#define ino_to_fsbo(fs, x) ((x) % INOPB(fs))
497
498/*
499 * Give cylinder group number for a file system block.
500 * Give cylinder group block number for a file system block.
501 */
502#define dtog(fs, d) ((d) / (fs)->fs_fpg)
503#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
504
505/*
506 * Extract the bits for a block from a map.
507 * Compute the cylinder and rotational position of a cyl block addr.
508 */
509#define blkmap(fs, map, loc) \
510 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
511#define cbtocylno(fs, bno) \
512 ((bno) * NSPF(fs) / (fs)->fs_spc)
513#define cbtorpos(fs, bno) \
514 (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \
515 (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \
516 (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect)
517
518/*
519 * The following macros optimize certain frequently calculated
520 * quantities by using shifts and masks in place of divisions
521 * modulos and multiplications.
522 */
523#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
524 ((loc) & (fs)->fs_qbmask)
525#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
526 ((loc) & (fs)->fs_qfmask)
527#define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \
528 ((off_t)(blk) << (fs)->fs_bshift)
529/* Use this only when `blk' is known to be small, e.g., < NDADDR. */
530#define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \
531 ((blk) << (fs)->fs_bshift)
532#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
533 ((loc) >> (fs)->fs_bshift)
534#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
535 ((loc) >> (fs)->fs_fshift)
536#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
537 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
538#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
539 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
540#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
541 ((frags) >> (fs)->fs_fragshift)
542#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
543 ((blks) << (fs)->fs_fragshift)
544#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
545 ((fsb) & ((fs)->fs_frag - 1))
546#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
547 ((fsb) &~ ((fs)->fs_frag - 1))
548
549/*
550 * Determine the number of available frags given a
551 * percentage to hold in reserve.
552 */
553#define freespace(fs, percentreserved) \
554 (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
555 (fs)->fs_cstotal.cs_nffree - \
556 ((off_t)((fs)->fs_dsize) * (percentreserved) / 100))
557
558/*
559 * Determining the size of a file block in the file system.
560 */
561#define blksize(fs, ip, lbn) \
562 (((lbn) >= NDADDR || (ip)->i_size >= smalllblktosize(fs, (lbn) + 1)) \
563 ? (fs)->fs_bsize \
564 : (fragroundup(fs, blkoff(fs, (ip)->i_size))))
565#define dblksize(fs, dip, lbn) \
566 (((lbn) >= NDADDR || \
567 (dip)->di_size >= (u_int64_t)smalllblktosize(fs, (lbn) + 1)) \
568 ? (fs)->fs_bsize \
569 : (fragroundup(fs, blkoff(fs, (dip)->di_size))))
570#define sblksize(fs, size, lbn) \
571 (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
572 ? (fs)->fs_bsize \
573 : (fragroundup(fs, blkoff(fs, (size)))))
574
575
576/*
577 * Number of disk sectors per block/fragment; assumes DEV_BSIZE byte
578 * sector size.
579 */
580#define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift)
581#define NSPF(fs) ((fs)->fs_nspf)
582
583/*
584 * Number of inodes in a secondary storage block/fragment.
585 */
586#define INOPB(fs) ((fs)->fs_inopb)
587#define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
588
589/*
590 * Number of indirects in a file system block.
591 */
592#define NINDIR(fs) ((fs)->fs_nindir)
593
594extern int inside[], around[];
595extern u_char *fragtbl[];
596
597#endif
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