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da7c5cc6 | 1 | /* |
1810611d | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
202a4bd9 | 3 | * All rights reserved. |
da7c5cc6 | 4 | * |
af359dea C |
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. | |
202a4bd9 | 20 | * |
af359dea C |
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 7.12 (Berkeley) 5/8/91 | |
da7c5cc6 | 34 | */ |
1ef63481 KM |
35 | |
36 | /* | |
37 | * Each disk drive contains some number of file systems. | |
38 | * A file system consists of a number of cylinder groups. | |
39 | * Each cylinder group has inodes and data. | |
40 | * | |
41 | * A file system is described by its super-block, which in turn | |
42 | * describes the cylinder groups. The super-block is critical | |
43 | * data and is replicated in each cylinder group to protect against | |
e5205031 | 44 | * catastrophic loss. This is done at `newfs' time and the critical |
1ef63481 KM |
45 | * super-block data does not change, so the copies need not be |
46 | * referenced further unless disaster strikes. | |
47 | * | |
aca50d72 KM |
48 | * For file system fs, the offsets of the various blocks of interest |
49 | * are given in the super block as: | |
aca50d72 KM |
50 | * [fs->fs_sblkno] Super-block |
51 | * [fs->fs_cblkno] Cylinder group block | |
52 | * [fs->fs_iblkno] Inode blocks | |
53 | * [fs->fs_dblkno] Data blocks | |
54 | * The beginning of cylinder group cg in fs, is given by | |
6994bf5d | 55 | * the ``cgbase(fs, cg)'' macro. |
b6407c9d | 56 | * |
aca50d72 | 57 | * The first boot and super blocks are given in absolute disk addresses. |
cddafded | 58 | * The byte-offset forms are preferred, as they don't imply a sector size. |
b6407c9d | 59 | */ |
1df1dbcd | 60 | #define BBSIZE 8192 |
80cc8328 | 61 | #define SBSIZE 8192 |
cddafded MK |
62 | #define BBOFF ((off_t)(0)) |
63 | #define SBOFF ((off_t)(BBOFF + BBSIZE)) | |
80cc8328 KM |
64 | #define BBLOCK ((daddr_t)(0)) |
65 | #define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) | |
1ef63481 KM |
66 | |
67 | /* | |
b6407c9d KM |
68 | * Addresses stored in inodes are capable of addressing fragments |
69 | * of `blocks'. File system blocks of at most size MAXBSIZE can | |
70 | * be optionally broken into 2, 4, or 8 pieces, each of which is | |
71 | * addressible; these pieces may be DEV_BSIZE, or some multiple of | |
72 | * a DEV_BSIZE unit. | |
1ef63481 | 73 | * |
b6407c9d KM |
74 | * Large files consist of exclusively large data blocks. To avoid |
75 | * undue wasted disk space, the last data block of a small file may be | |
76 | * allocated as only as many fragments of a large block as are | |
77 | * necessary. The file system format retains only a single pointer | |
78 | * to such a fragment, which is a piece of a single large block that | |
79 | * has been divided. The size of such a fragment is determinable from | |
80 | * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. | |
1ef63481 KM |
81 | * |
82 | * The file system records space availability at the fragment level; | |
83 | * to determine block availability, aligned fragments are examined. | |
743f1ef7 | 84 | * |
80cc8328 KM |
85 | * The root inode is the root of the file system. |
86 | * Inode 0 can't be used for normal purposes and | |
87 | * historically bad blocks were linked to inode 1, | |
88 | * thus the root inode is 2. (inode 1 is no longer used for | |
89 | * this purpose, however numerous dump tapes make this | |
90 | * assumption, so we are stuck with it) | |
80cc8328 | 91 | */ |
af359dea | 92 | #define ROOTINO ((ino_t)2) |
1ef63481 | 93 | |
b6407c9d KM |
94 | /* |
95 | * MINBSIZE is the smallest allowable block size. | |
96 | * In order to insure that it is possible to create files of size | |
97 | * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. | |
98 | * MINBSIZE must be big enough to hold a cylinder group block, | |
99 | * thus changes to (struct cg) must keep its size within MINBSIZE. | |
25621fac KM |
100 | * Note that super blocks are always of size SBSIZE, |
101 | * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. | |
b6407c9d KM |
102 | */ |
103 | #define MINBSIZE 4096 | |
80cc8328 | 104 | |
2c9afb08 KM |
105 | /* |
106 | * The path name on which the file system is mounted is maintained | |
107 | * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in | |
108 | * the super block for this name. | |
1b807fc9 | 109 | * The limit on the amount of summary information per file system |
26169eda KM |
110 | * is defined by MAXCSBUFS. It is currently parameterized for a |
111 | * maximum of two million cylinders. | |
2c9afb08 | 112 | */ |
e5205031 | 113 | #define MAXMNTLEN 512 |
26169eda | 114 | #define MAXCSBUFS 32 |
2c9afb08 | 115 | |
1ef63481 | 116 | /* |
80cc8328 KM |
117 | * Per cylinder group information; summarized in blocks allocated |
118 | * from first cylinder group data blocks. These blocks have to be | |
119 | * read in from fs_csaddr (size fs_cssize) in addition to the | |
120 | * super block. | |
1ef63481 | 121 | * |
80cc8328 KM |
122 | * N.B. sizeof(struct csum) must be a power of two in order for |
123 | * the ``fs_cs'' macro to work (see below). | |
1ef63481 | 124 | */ |
80cc8328 KM |
125 | struct csum { |
126 | long cs_ndir; /* number of directories */ | |
127 | long cs_nbfree; /* number of free blocks */ | |
128 | long cs_nifree; /* number of free inodes */ | |
129 | long cs_nffree; /* number of free frags */ | |
130 | }; | |
1ef63481 | 131 | |
80cc8328 KM |
132 | /* |
133 | * Super block for a file system. | |
134 | */ | |
b9b166c6 | 135 | #define FS_MAGIC 0x011954 |
7155fb09 | 136 | #define FSOKAY 0x7c269d38 |
1ef63481 KM |
137 | struct fs |
138 | { | |
b9b166c6 KM |
139 | struct fs *fs_link; /* linked list of file systems */ |
140 | struct fs *fs_rlink; /* used for incore super blocks */ | |
26169eda | 141 | daddr_t fs_sblkno; /* addr of super-block in filesys */ |
aca50d72 KM |
142 | daddr_t fs_cblkno; /* offset of cyl-block in filesys */ |
143 | daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ | |
26169eda KM |
144 | daddr_t fs_dblkno; /* offset of first data after cg */ |
145 | long fs_cgoffset; /* cylinder group offset in cylinder */ | |
146 | long fs_cgmask; /* used to calc mod fs_ntrak */ | |
1ef63481 | 147 | time_t fs_time; /* last time written */ |
003319d1 KM |
148 | long fs_size; /* number of blocks in fs */ |
149 | long fs_dsize; /* number of data blocks in fs */ | |
150 | long fs_ncg; /* number of cylinder groups */ | |
b6407c9d KM |
151 | long fs_bsize; /* size of basic blocks in fs */ |
152 | long fs_fsize; /* size of frag blocks in fs */ | |
26169eda | 153 | long fs_frag; /* number of frags in a block in fs */ |
7e2a7a5c | 154 | /* these are configuration parameters */ |
26169eda KM |
155 | long fs_minfree; /* minimum percentage of free blocks */ |
156 | long fs_rotdelay; /* num of ms for optimal next block */ | |
157 | long fs_rps; /* disk revolutions per second */ | |
7e2a7a5c | 158 | /* these fields can be computed from the others */ |
c1ab275c KM |
159 | long fs_bmask; /* ``blkoff'' calc of blk offsets */ |
160 | long fs_fmask; /* ``fragoff'' calc of frag offsets */ | |
26169eda KM |
161 | long fs_bshift; /* ``lblkno'' calc of logical blkno */ |
162 | long fs_fshift; /* ``numfrags'' calc number of frags */ | |
7e2a7a5c | 163 | /* these are configuration parameters */ |
af0b24db SL |
164 | long fs_maxcontig; /* max number of contiguous blks */ |
165 | long fs_maxbpg; /* max number of blks per cyl group */ | |
7e2a7a5c | 166 | /* these fields can be computed from the others */ |
decc359e KM |
167 | long fs_fragshift; /* block to frag shift */ |
168 | long fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ | |
169 | long fs_sbsize; /* actual size of super block */ | |
170 | long fs_csmask; /* csum block offset */ | |
171 | long fs_csshift; /* csum block number */ | |
172 | long fs_nindir; /* value of NINDIR */ | |
173 | long fs_inopb; /* value of INOPB */ | |
174 | long fs_nspf; /* value of NSPF */ | |
3699d961 | 175 | /* yet another configuration parameter */ |
b8f2ca7d | 176 | long fs_optim; /* optimization preference, see below */ |
3699d961 KM |
177 | /* these fields are derived from the hardware */ |
178 | long fs_npsect; /* # sectors/track including spares */ | |
179 | long fs_interleave; /* hardware sector interleave */ | |
180 | long fs_trackskew; /* sector 0 skew, per track */ | |
181 | long fs_headswitch; /* head switch time, usec */ | |
182 | long fs_trkseek; /* track-to-track seek, usec */ | |
1ef63481 | 183 | /* sizes determined by number of cylinder groups and their sizes */ |
b6407c9d | 184 | daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ |
003319d1 KM |
185 | long fs_cssize; /* size of cyl grp summary area */ |
186 | long fs_cgsize; /* cylinder group size */ | |
3699d961 | 187 | /* these fields are derived from the hardware */ |
26169eda KM |
188 | long fs_ntrak; /* tracks per cylinder */ |
189 | long fs_nsect; /* sectors per track */ | |
003319d1 | 190 | long fs_spc; /* sectors per cylinder */ |
1ef63481 | 191 | /* this comes from the disk driver partitioning */ |
003319d1 | 192 | long fs_ncyl; /* cylinders in file system */ |
1ef63481 | 193 | /* these fields can be computed from the others */ |
26169eda KM |
194 | long fs_cpg; /* cylinders per group */ |
195 | long fs_ipg; /* inodes per group */ | |
b6407c9d | 196 | long fs_fpg; /* blocks per group * fs_frag */ |
003319d1 KM |
197 | /* this data must be re-computed after crashes */ |
198 | struct csum fs_cstotal; /* cylinder summary information */ | |
1ef63481 KM |
199 | /* these fields are cleared at mount time */ |
200 | char fs_fmod; /* super block modified flag */ | |
26169eda | 201 | char fs_clean; /* file system is clean flag */ |
1ef63481 | 202 | char fs_ronly; /* mounted read-only flag */ |
26169eda | 203 | char fs_flags; /* currently unused flag */ |
2c9afb08 | 204 | char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ |
743f1ef7 | 205 | /* these fields retain the current block allocation info */ |
003319d1 | 206 | long fs_cgrotor; /* last cg searched */ |
1b807fc9 | 207 | struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ |
26169eda | 208 | long fs_cpc; /* cyl per cycle in postbl */ |
e5205031 | 209 | short fs_opostbl[16][8]; /* old rotation block list head */ |
7155fb09 KM |
210 | long fs_sparecon[55]; /* reserved for future constants */ |
211 | long fs_state; /* validate fs_clean field */ | |
e5205031 KM |
212 | quad fs_qbmask; /* ~fs_bmask - for use with quad size */ |
213 | quad fs_qfmask; /* ~fs_fmask - for use with quad size */ | |
214 | long fs_postblformat; /* format of positional layout tables */ | |
215 | long fs_nrpos; /* number of rotaional positions */ | |
216 | long fs_postbloff; /* (short) rotation block list head */ | |
217 | long fs_rotbloff; /* (u_char) blocks for each rotation */ | |
b9b166c6 | 218 | long fs_magic; /* magic number */ |
e5205031 | 219 | u_char fs_space[1]; /* list of blocks for each rotation */ |
743f1ef7 | 220 | /* actually longer */ |
1ef63481 | 221 | }; |
b8f2ca7d KM |
222 | /* |
223 | * Preference for optimization. | |
224 | */ | |
225 | #define FS_OPTTIME 0 /* minimize allocation time */ | |
226 | #define FS_OPTSPACE 1 /* minimize disk fragmentation */ | |
b6407c9d | 227 | |
e5205031 KM |
228 | /* |
229 | * Rotational layout table format types | |
230 | */ | |
231 | #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ | |
232 | #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ | |
233 | /* | |
234 | * Macros for access to superblock array structures | |
235 | */ | |
236 | #define fs_postbl(fs, cylno) \ | |
237 | (((fs)->fs_postblformat == FS_42POSTBLFMT) \ | |
238 | ? ((fs)->fs_opostbl[cylno]) \ | |
239 | : ((short *)((char *)(fs) + (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) | |
240 | #define fs_rotbl(fs) \ | |
241 | (((fs)->fs_postblformat == FS_42POSTBLFMT) \ | |
242 | ? ((fs)->fs_space) \ | |
243 | : ((u_char *)((char *)(fs) + (fs)->fs_rotbloff))) | |
244 | ||
b6407c9d | 245 | /* |
2c9afb08 | 246 | * Convert cylinder group to base address of its global summary info. |
80cc8328 | 247 | * |
b6407c9d KM |
248 | * N.B. This macro assumes that sizeof(struct csum) is a power of two. |
249 | */ | |
250 | #define fs_cs(fs, indx) \ | |
7e2a7a5c | 251 | fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] |
1ef63481 | 252 | |
1ef63481 | 253 | /* |
80cc8328 | 254 | * Cylinder group block for a file system. |
1ef63481 | 255 | */ |
b9b166c6 | 256 | #define CG_MAGIC 0x090255 |
1ef63481 | 257 | struct cg { |
b9b166c6 | 258 | struct cg *cg_link; /* linked list of cyl groups */ |
e5205031 | 259 | long cg_magic; /* magic number */ |
1ef63481 | 260 | time_t cg_time; /* time last written */ |
003319d1 | 261 | long cg_cgx; /* we are the cgx'th cylinder group */ |
1ef63481 KM |
262 | short cg_ncyl; /* number of cyl's this cg */ |
263 | short cg_niblk; /* number of inode blocks this cg */ | |
003319d1 KM |
264 | long cg_ndblk; /* number of data blocks this cg */ |
265 | struct csum cg_cs; /* cylinder summary information */ | |
266 | long cg_rotor; /* position of last used block */ | |
267 | long cg_frotor; /* position of last used frag */ | |
268 | long cg_irotor; /* position of last used inode */ | |
b6407c9d | 269 | long cg_frsum[MAXFRAG]; /* counts of available frags */ |
e5205031 KM |
270 | long cg_btotoff; /* (long) block totals per cylinder */ |
271 | long cg_boff; /* (short) free block positions */ | |
272 | long cg_iusedoff; /* (char) used inode map */ | |
273 | long cg_freeoff; /* (u_char) free block map */ | |
274 | long cg_nextfreeoff; /* (u_char) next available space */ | |
275 | long cg_sparecon[16]; /* reserved for future use */ | |
276 | u_char cg_space[1]; /* space for cylinder group maps */ | |
1ef63481 KM |
277 | /* actually longer */ |
278 | }; | |
e5205031 KM |
279 | /* |
280 | * Macros for access to cylinder group array structures | |
281 | */ | |
282 | #define cg_blktot(cgp) \ | |
283 | (((cgp)->cg_magic != CG_MAGIC) \ | |
284 | ? (((struct ocg *)(cgp))->cg_btot) \ | |
285 | : ((long *)((char *)(cgp) + (cgp)->cg_btotoff))) | |
286 | #define cg_blks(fs, cgp, cylno) \ | |
287 | (((cgp)->cg_magic != CG_MAGIC) \ | |
288 | ? (((struct ocg *)(cgp))->cg_b[cylno]) \ | |
289 | : ((short *)((char *)(cgp) + (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) | |
290 | #define cg_inosused(cgp) \ | |
291 | (((cgp)->cg_magic != CG_MAGIC) \ | |
292 | ? (((struct ocg *)(cgp))->cg_iused) \ | |
293 | : ((char *)((char *)(cgp) + (cgp)->cg_iusedoff))) | |
294 | #define cg_blksfree(cgp) \ | |
295 | (((cgp)->cg_magic != CG_MAGIC) \ | |
296 | ? (((struct ocg *)(cgp))->cg_free) \ | |
297 | : ((u_char *)((char *)(cgp) + (cgp)->cg_freeoff))) | |
298 | #define cg_chkmagic(cgp) \ | |
299 | ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) | |
80cc8328 KM |
300 | |
301 | /* | |
e5205031 KM |
302 | * The following structure is defined |
303 | * for compatibility with old file systems. | |
80cc8328 | 304 | */ |
e5205031 KM |
305 | struct ocg { |
306 | struct ocg *cg_link; /* linked list of cyl groups */ | |
307 | struct ocg *cg_rlink; /* used for incore cyl groups */ | |
308 | time_t cg_time; /* time last written */ | |
309 | long cg_cgx; /* we are the cgx'th cylinder group */ | |
310 | short cg_ncyl; /* number of cyl's this cg */ | |
311 | short cg_niblk; /* number of inode blocks this cg */ | |
312 | long cg_ndblk; /* number of data blocks this cg */ | |
313 | struct csum cg_cs; /* cylinder summary information */ | |
314 | long cg_rotor; /* position of last used block */ | |
315 | long cg_frotor; /* position of last used frag */ | |
316 | long cg_irotor; /* position of last used inode */ | |
317 | long cg_frsum[8]; /* counts of available frags */ | |
318 | long cg_btot[32]; /* block totals per cylinder */ | |
319 | short cg_b[32][8]; /* positions of free blocks */ | |
320 | char cg_iused[256]; /* used inode map */ | |
321 | long cg_magic; /* magic number */ | |
322 | u_char cg_free[1]; /* free block map */ | |
323 | /* actually longer */ | |
324 | }; | |
80cc8328 KM |
325 | |
326 | /* | |
327 | * Turn file system block numbers into disk block addresses. | |
328 | * This maps file system blocks to device size blocks. | |
329 | */ | |
7e2a7a5c KM |
330 | #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) |
331 | #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) | |
80cc8328 KM |
332 | |
333 | /* | |
334 | * Cylinder group macros to locate things in cylinder groups. | |
26169eda | 335 | * They calc file system addresses of cylinder group data structures. |
80cc8328 | 336 | */ |
26169eda KM |
337 | #define cgbase(fs, c) ((daddr_t)((fs)->fs_fpg * (c))) |
338 | #define cgstart(fs, c) \ | |
339 | (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) | |
340 | #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ | |
341 | #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ | |
342 | #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ | |
343 | #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ | |
80cc8328 KM |
344 | |
345 | /* | |
2c9afb08 KM |
346 | * Macros for handling inode numbers: |
347 | * inode number to file system block offset. | |
348 | * inode number to cylinder group number. | |
349 | * inode number to file system block address. | |
80cc8328 | 350 | */ |
6994bf5d KM |
351 | #define itoo(fs, x) ((x) % INOPB(fs)) |
352 | #define itog(fs, x) ((x) / (fs)->fs_ipg) | |
353 | #define itod(fs, x) \ | |
354 | ((daddr_t)(cgimin(fs, itog(fs, x)) + \ | |
c7cd2adb | 355 | (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) |
80cc8328 | 356 | |
80cc8328 | 357 | /* |
2c9afb08 KM |
358 | * Give cylinder group number for a file system block. |
359 | * Give cylinder group block number for a file system block. | |
80cc8328 | 360 | */ |
6994bf5d KM |
361 | #define dtog(fs, d) ((d) / (fs)->fs_fpg) |
362 | #define dtogd(fs, d) ((d) % (fs)->fs_fpg) | |
80cc8328 | 363 | |
aca50d72 | 364 | /* |
2c9afb08 KM |
365 | * Extract the bits for a block from a map. |
366 | * Compute the cylinder and rotational position of a cyl block addr. | |
aca50d72 | 367 | */ |
2c9afb08 | 368 | #define blkmap(fs, map, loc) \ |
25621fac | 369 | (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) |
aca50d72 | 370 | #define cbtocylno(fs, bno) \ |
5a367fe7 | 371 | ((bno) * NSPF(fs) / (fs)->fs_spc) |
aca50d72 | 372 | #define cbtorpos(fs, bno) \ |
3699d961 KM |
373 | (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ |
374 | (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ | |
e5205031 | 375 | (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) |
aca50d72 | 376 | |
c1ab275c KM |
377 | /* |
378 | * The following macros optimize certain frequently calculated | |
379 | * quantities by using shifts and masks in place of divisions | |
380 | * modulos and multiplications. | |
381 | */ | |
382 | #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ | |
383 | ((loc) & ~(fs)->fs_bmask) | |
384 | #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ | |
385 | ((loc) & ~(fs)->fs_fmask) | |
beeb484c KM |
386 | #define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ |
387 | ((blk) << (fs)->fs_bshift) | |
c1ab275c KM |
388 | #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ |
389 | ((loc) >> (fs)->fs_bshift) | |
390 | #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ | |
391 | ((loc) >> (fs)->fs_fshift) | |
392 | #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ | |
393 | (((size) + (fs)->fs_bsize - 1) & (fs)->fs_bmask) | |
394 | #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ | |
395 | (((size) + (fs)->fs_fsize - 1) & (fs)->fs_fmask) | |
c7cd2adb SL |
396 | #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ |
397 | ((frags) >> (fs)->fs_fragshift) | |
398 | #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ | |
399 | ((blks) << (fs)->fs_fragshift) | |
6d55d657 KM |
400 | #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ |
401 | ((fsb) & ((fs)->fs_frag - 1)) | |
402 | #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ | |
403 | ((fsb) &~ ((fs)->fs_frag - 1)) | |
c7cd2adb SL |
404 | |
405 | /* | |
406 | * Determine the number of available frags given a | |
407 | * percentage to hold in reserve | |
408 | */ | |
409 | #define freespace(fs, percentreserved) \ | |
410 | (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ | |
411 | (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) | |
c1ab275c | 412 | |
80cc8328 | 413 | /* |
2c9afb08 | 414 | * Determining the size of a file block in the file system. |
80cc8328 KM |
415 | */ |
416 | #define blksize(fs, ip, lbn) \ | |
7e2a7a5c | 417 | (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ |
c1ab275c KM |
418 | ? (fs)->fs_bsize \ |
419 | : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) | |
80cc8328 | 420 | #define dblksize(fs, dip, lbn) \ |
7e2a7a5c | 421 | (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ |
c1ab275c KM |
422 | ? (fs)->fs_bsize \ |
423 | : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) | |
80cc8328 KM |
424 | |
425 | /* | |
2c9afb08 | 426 | * Number of disk sectors per block; assumes DEV_BSIZE byte sector size. |
80cc8328 | 427 | */ |
7e2a7a5c KM |
428 | #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) |
429 | #define NSPF(fs) ((fs)->fs_nspf) | |
80cc8328 KM |
430 | |
431 | /* | |
2c9afb08 | 432 | * INOPB is the number of inodes in a secondary storage block. |
80cc8328 | 433 | */ |
7e2a7a5c KM |
434 | #define INOPB(fs) ((fs)->fs_inopb) |
435 | #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) | |
80cc8328 KM |
436 | |
437 | /* | |
2c9afb08 | 438 | * NINDIR is the number of indirects in a file system block. |
80cc8328 | 439 | */ |
7e2a7a5c | 440 | #define NINDIR(fs) ((fs)->fs_nindir) |