Commit | Line | Data |
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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 | * |
b702c21d | 5 | * %sccs.include.redist.c% |
202a4bd9 | 6 | * |
d4c7e622 | 7 | * @(#)fs.h 7.12 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
1ef63481 KM |
9 | |
10 | /* | |
11 | * Each disk drive contains some number of file systems. | |
12 | * A file system consists of a number of cylinder groups. | |
13 | * Each cylinder group has inodes and data. | |
14 | * | |
15 | * A file system is described by its super-block, which in turn | |
16 | * describes the cylinder groups. The super-block is critical | |
17 | * data and is replicated in each cylinder group to protect against | |
e5205031 | 18 | * catastrophic loss. This is done at `newfs' time and the critical |
1ef63481 KM |
19 | * super-block data does not change, so the copies need not be |
20 | * referenced further unless disaster strikes. | |
21 | * | |
aca50d72 KM |
22 | * For file system fs, the offsets of the various blocks of interest |
23 | * are given in the super block as: | |
aca50d72 KM |
24 | * [fs->fs_sblkno] Super-block |
25 | * [fs->fs_cblkno] Cylinder group block | |
26 | * [fs->fs_iblkno] Inode blocks | |
27 | * [fs->fs_dblkno] Data blocks | |
28 | * The beginning of cylinder group cg in fs, is given by | |
6994bf5d | 29 | * the ``cgbase(fs, cg)'' macro. |
b6407c9d | 30 | * |
aca50d72 | 31 | * The first boot and super blocks are given in absolute disk addresses. |
cddafded | 32 | * The byte-offset forms are preferred, as they don't imply a sector size. |
f08630d9 | 33 | * The byte-offset forms are preferred, as they don't imply a sector size. |
b6407c9d | 34 | */ |
1df1dbcd | 35 | #define BBSIZE 8192 |
80cc8328 | 36 | #define SBSIZE 8192 |
cddafded MK |
37 | #define BBOFF ((off_t)(0)) |
38 | #define SBOFF ((off_t)(BBOFF + BBSIZE)) | |
f08630d9 MK |
39 | #define BBOFF ((off_t)(0)) |
40 | #define SBOFF ((off_t)(BBOFF + BBSIZE)) | |
cddafded | 41 | #ifndef SECSIZE |
80cc8328 KM |
42 | #define BBLOCK ((daddr_t)(0)) |
43 | #define SBLOCK ((daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE)) | |
cddafded | 44 | #endif SECSIZE |
1ef63481 KM |
45 | |
46 | /* | |
b6407c9d KM |
47 | * Addresses stored in inodes are capable of addressing fragments |
48 | * of `blocks'. File system blocks of at most size MAXBSIZE can | |
49 | * be optionally broken into 2, 4, or 8 pieces, each of which is | |
50 | * addressible; these pieces may be DEV_BSIZE, or some multiple of | |
51 | * a DEV_BSIZE unit. | |
1ef63481 | 52 | * |
b6407c9d KM |
53 | * Large files consist of exclusively large data blocks. To avoid |
54 | * undue wasted disk space, the last data block of a small file may be | |
55 | * allocated as only as many fragments of a large block as are | |
56 | * necessary. The file system format retains only a single pointer | |
57 | * to such a fragment, which is a piece of a single large block that | |
58 | * has been divided. The size of such a fragment is determinable from | |
59 | * information in the inode, using the ``blksize(fs, ip, lbn)'' macro. | |
1ef63481 KM |
60 | * |
61 | * The file system records space availability at the fragment level; | |
62 | * to determine block availability, aligned fragments are examined. | |
743f1ef7 | 63 | * |
80cc8328 KM |
64 | * The root inode is the root of the file system. |
65 | * Inode 0 can't be used for normal purposes and | |
66 | * historically bad blocks were linked to inode 1, | |
67 | * thus the root inode is 2. (inode 1 is no longer used for | |
68 | * this purpose, however numerous dump tapes make this | |
69 | * assumption, so we are stuck with it) | |
80cc8328 | 70 | */ |
d4c7e622 | 71 | #define ROOTINO ((ino_t)2) |
1ef63481 | 72 | |
b6407c9d KM |
73 | /* |
74 | * MINBSIZE is the smallest allowable block size. | |
75 | * In order to insure that it is possible to create files of size | |
76 | * 2^32 with only two levels of indirection, MINBSIZE is set to 4096. | |
77 | * MINBSIZE must be big enough to hold a cylinder group block, | |
78 | * thus changes to (struct cg) must keep its size within MINBSIZE. | |
25621fac KM |
79 | * Note that super blocks are always of size SBSIZE, |
80 | * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE. | |
b6407c9d KM |
81 | */ |
82 | #define MINBSIZE 4096 | |
80cc8328 | 83 | |
2c9afb08 KM |
84 | /* |
85 | * The path name on which the file system is mounted is maintained | |
86 | * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in | |
87 | * the super block for this name. | |
1b807fc9 | 88 | * The limit on the amount of summary information per file system |
26169eda KM |
89 | * is defined by MAXCSBUFS. It is currently parameterized for a |
90 | * maximum of two million cylinders. | |
2c9afb08 | 91 | */ |
e5205031 | 92 | #define MAXMNTLEN 512 |
26169eda | 93 | #define MAXCSBUFS 32 |
2c9afb08 | 94 | |
1ef63481 | 95 | /* |
80cc8328 KM |
96 | * Per cylinder group information; summarized in blocks allocated |
97 | * from first cylinder group data blocks. These blocks have to be | |
98 | * read in from fs_csaddr (size fs_cssize) in addition to the | |
99 | * super block. | |
1ef63481 | 100 | * |
80cc8328 KM |
101 | * N.B. sizeof(struct csum) must be a power of two in order for |
102 | * the ``fs_cs'' macro to work (see below). | |
1ef63481 | 103 | */ |
80cc8328 KM |
104 | struct csum { |
105 | long cs_ndir; /* number of directories */ | |
106 | long cs_nbfree; /* number of free blocks */ | |
107 | long cs_nifree; /* number of free inodes */ | |
108 | long cs_nffree; /* number of free frags */ | |
109 | }; | |
1ef63481 | 110 | |
80cc8328 KM |
111 | /* |
112 | * Super block for a file system. | |
113 | */ | |
b9b166c6 | 114 | #define FS_MAGIC 0x011954 |
7155fb09 | 115 | #define FSOKAY 0x7c269d38 |
1ef63481 KM |
116 | struct fs |
117 | { | |
b9b166c6 KM |
118 | struct fs *fs_link; /* linked list of file systems */ |
119 | struct fs *fs_rlink; /* used for incore super blocks */ | |
26169eda | 120 | daddr_t fs_sblkno; /* addr of super-block in filesys */ |
aca50d72 KM |
121 | daddr_t fs_cblkno; /* offset of cyl-block in filesys */ |
122 | daddr_t fs_iblkno; /* offset of inode-blocks in filesys */ | |
26169eda KM |
123 | daddr_t fs_dblkno; /* offset of first data after cg */ |
124 | long fs_cgoffset; /* cylinder group offset in cylinder */ | |
125 | long fs_cgmask; /* used to calc mod fs_ntrak */ | |
1ef63481 | 126 | time_t fs_time; /* last time written */ |
003319d1 KM |
127 | long fs_size; /* number of blocks in fs */ |
128 | long fs_dsize; /* number of data blocks in fs */ | |
129 | long fs_ncg; /* number of cylinder groups */ | |
b6407c9d KM |
130 | long fs_bsize; /* size of basic blocks in fs */ |
131 | long fs_fsize; /* size of frag blocks in fs */ | |
26169eda | 132 | long fs_frag; /* number of frags in a block in fs */ |
7e2a7a5c | 133 | /* these are configuration parameters */ |
26169eda KM |
134 | long fs_minfree; /* minimum percentage of free blocks */ |
135 | long fs_rotdelay; /* num of ms for optimal next block */ | |
136 | long fs_rps; /* disk revolutions per second */ | |
7e2a7a5c | 137 | /* these fields can be computed from the others */ |
c1ab275c KM |
138 | long fs_bmask; /* ``blkoff'' calc of blk offsets */ |
139 | long fs_fmask; /* ``fragoff'' calc of frag offsets */ | |
26169eda KM |
140 | long fs_bshift; /* ``lblkno'' calc of logical blkno */ |
141 | long fs_fshift; /* ``numfrags'' calc number of frags */ | |
7e2a7a5c | 142 | /* these are configuration parameters */ |
af0b24db SL |
143 | long fs_maxcontig; /* max number of contiguous blks */ |
144 | long fs_maxbpg; /* max number of blks per cyl group */ | |
7e2a7a5c | 145 | /* these fields can be computed from the others */ |
decc359e KM |
146 | long fs_fragshift; /* block to frag shift */ |
147 | long fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ | |
148 | long fs_sbsize; /* actual size of super block */ | |
149 | long fs_csmask; /* csum block offset */ | |
150 | long fs_csshift; /* csum block number */ | |
151 | long fs_nindir; /* value of NINDIR */ | |
152 | long fs_inopb; /* value of INOPB */ | |
153 | long fs_nspf; /* value of NSPF */ | |
3699d961 | 154 | /* yet another configuration parameter */ |
b8f2ca7d | 155 | long fs_optim; /* optimization preference, see below */ |
3699d961 KM |
156 | /* these fields are derived from the hardware */ |
157 | long fs_npsect; /* # sectors/track including spares */ | |
158 | long fs_interleave; /* hardware sector interleave */ | |
159 | long fs_trackskew; /* sector 0 skew, per track */ | |
160 | long fs_headswitch; /* head switch time, usec */ | |
161 | long fs_trkseek; /* track-to-track seek, usec */ | |
1ef63481 | 162 | /* sizes determined by number of cylinder groups and their sizes */ |
b6407c9d | 163 | daddr_t fs_csaddr; /* blk addr of cyl grp summary area */ |
003319d1 KM |
164 | long fs_cssize; /* size of cyl grp summary area */ |
165 | long fs_cgsize; /* cylinder group size */ | |
3699d961 | 166 | /* these fields are derived from the hardware */ |
26169eda KM |
167 | long fs_ntrak; /* tracks per cylinder */ |
168 | long fs_nsect; /* sectors per track */ | |
003319d1 | 169 | long fs_spc; /* sectors per cylinder */ |
1ef63481 | 170 | /* this comes from the disk driver partitioning */ |
003319d1 | 171 | long fs_ncyl; /* cylinders in file system */ |
1ef63481 | 172 | /* these fields can be computed from the others */ |
26169eda KM |
173 | long fs_cpg; /* cylinders per group */ |
174 | long fs_ipg; /* inodes per group */ | |
b6407c9d | 175 | long fs_fpg; /* blocks per group * fs_frag */ |
003319d1 KM |
176 | /* this data must be re-computed after crashes */ |
177 | struct csum fs_cstotal; /* cylinder summary information */ | |
1ef63481 KM |
178 | /* these fields are cleared at mount time */ |
179 | char fs_fmod; /* super block modified flag */ | |
26169eda | 180 | char fs_clean; /* file system is clean flag */ |
1ef63481 | 181 | char fs_ronly; /* mounted read-only flag */ |
26169eda | 182 | char fs_flags; /* currently unused flag */ |
2c9afb08 | 183 | char fs_fsmnt[MAXMNTLEN]; /* name mounted on */ |
cddafded MK |
184 | long fs_dbsize; /* hardware sector size */ |
185 | long fs_sparecon[31]; /* reserved for future constants */ | |
743f1ef7 | 186 | /* these fields retain the current block allocation info */ |
003319d1 | 187 | long fs_cgrotor; /* last cg searched */ |
1b807fc9 | 188 | struct csum *fs_csp[MAXCSBUFS];/* list of fs_cs info buffers */ |
26169eda | 189 | long fs_cpc; /* cyl per cycle in postbl */ |
e5205031 | 190 | short fs_opostbl[16][8]; /* old rotation block list head */ |
7155fb09 KM |
191 | long fs_sparecon[55]; /* reserved for future constants */ |
192 | long fs_state; /* validate fs_clean field */ | |
e5205031 KM |
193 | quad fs_qbmask; /* ~fs_bmask - for use with quad size */ |
194 | quad fs_qfmask; /* ~fs_fmask - for use with quad size */ | |
195 | long fs_postblformat; /* format of positional layout tables */ | |
196 | long fs_nrpos; /* number of rotaional positions */ | |
197 | long fs_postbloff; /* (short) rotation block list head */ | |
198 | long fs_rotbloff; /* (u_char) blocks for each rotation */ | |
b9b166c6 | 199 | long fs_magic; /* magic number */ |
e5205031 | 200 | u_char fs_space[1]; /* list of blocks for each rotation */ |
743f1ef7 | 201 | /* actually longer */ |
1ef63481 | 202 | }; |
b8f2ca7d KM |
203 | /* |
204 | * Preference for optimization. | |
205 | */ | |
206 | #define FS_OPTTIME 0 /* minimize allocation time */ | |
207 | #define FS_OPTSPACE 1 /* minimize disk fragmentation */ | |
b6407c9d | 208 | |
e5205031 KM |
209 | /* |
210 | * Rotational layout table format types | |
211 | */ | |
212 | #define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ | |
213 | #define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */ | |
214 | /* | |
215 | * Macros for access to superblock array structures | |
216 | */ | |
217 | #define fs_postbl(fs, cylno) \ | |
218 | (((fs)->fs_postblformat == FS_42POSTBLFMT) \ | |
219 | ? ((fs)->fs_opostbl[cylno]) \ | |
220 | : ((short *)((char *)(fs) + (fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos)) | |
221 | #define fs_rotbl(fs) \ | |
222 | (((fs)->fs_postblformat == FS_42POSTBLFMT) \ | |
223 | ? ((fs)->fs_space) \ | |
224 | : ((u_char *)((char *)(fs) + (fs)->fs_rotbloff))) | |
225 | ||
b6407c9d | 226 | /* |
2c9afb08 | 227 | * Convert cylinder group to base address of its global summary info. |
80cc8328 | 228 | * |
b6407c9d KM |
229 | * N.B. This macro assumes that sizeof(struct csum) is a power of two. |
230 | */ | |
231 | #define fs_cs(fs, indx) \ | |
7e2a7a5c | 232 | fs_csp[(indx) >> (fs)->fs_csshift][(indx) & ~(fs)->fs_csmask] |
1ef63481 | 233 | |
1ef63481 | 234 | /* |
80cc8328 | 235 | * Cylinder group block for a file system. |
1ef63481 | 236 | */ |
b9b166c6 | 237 | #define CG_MAGIC 0x090255 |
1ef63481 | 238 | struct cg { |
b9b166c6 | 239 | struct cg *cg_link; /* linked list of cyl groups */ |
e5205031 | 240 | long cg_magic; /* magic number */ |
1ef63481 | 241 | time_t cg_time; /* time last written */ |
003319d1 | 242 | long cg_cgx; /* we are the cgx'th cylinder group */ |
1ef63481 KM |
243 | short cg_ncyl; /* number of cyl's this cg */ |
244 | short cg_niblk; /* number of inode blocks this cg */ | |
003319d1 KM |
245 | long cg_ndblk; /* number of data blocks this cg */ |
246 | struct csum cg_cs; /* cylinder summary information */ | |
247 | long cg_rotor; /* position of last used block */ | |
248 | long cg_frotor; /* position of last used frag */ | |
249 | long cg_irotor; /* position of last used inode */ | |
b6407c9d | 250 | long cg_frsum[MAXFRAG]; /* counts of available frags */ |
e5205031 KM |
251 | long cg_btotoff; /* (long) block totals per cylinder */ |
252 | long cg_boff; /* (short) free block positions */ | |
253 | long cg_iusedoff; /* (char) used inode map */ | |
254 | long cg_freeoff; /* (u_char) free block map */ | |
255 | long cg_nextfreeoff; /* (u_char) next available space */ | |
256 | long cg_sparecon[16]; /* reserved for future use */ | |
257 | u_char cg_space[1]; /* space for cylinder group maps */ | |
1ef63481 KM |
258 | /* actually longer */ |
259 | }; | |
e5205031 KM |
260 | /* |
261 | * Macros for access to cylinder group array structures | |
262 | */ | |
263 | #define cg_blktot(cgp) \ | |
264 | (((cgp)->cg_magic != CG_MAGIC) \ | |
265 | ? (((struct ocg *)(cgp))->cg_btot) \ | |
266 | : ((long *)((char *)(cgp) + (cgp)->cg_btotoff))) | |
267 | #define cg_blks(fs, cgp, cylno) \ | |
268 | (((cgp)->cg_magic != CG_MAGIC) \ | |
269 | ? (((struct ocg *)(cgp))->cg_b[cylno]) \ | |
270 | : ((short *)((char *)(cgp) + (cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos)) | |
271 | #define cg_inosused(cgp) \ | |
272 | (((cgp)->cg_magic != CG_MAGIC) \ | |
273 | ? (((struct ocg *)(cgp))->cg_iused) \ | |
274 | : ((char *)((char *)(cgp) + (cgp)->cg_iusedoff))) | |
275 | #define cg_blksfree(cgp) \ | |
276 | (((cgp)->cg_magic != CG_MAGIC) \ | |
277 | ? (((struct ocg *)(cgp))->cg_free) \ | |
278 | : ((u_char *)((char *)(cgp) + (cgp)->cg_freeoff))) | |
279 | #define cg_chkmagic(cgp) \ | |
280 | ((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC) | |
80cc8328 KM |
281 | |
282 | /* | |
e5205031 KM |
283 | * The following structure is defined |
284 | * for compatibility with old file systems. | |
80cc8328 | 285 | */ |
e5205031 KM |
286 | struct ocg { |
287 | struct ocg *cg_link; /* linked list of cyl groups */ | |
288 | struct ocg *cg_rlink; /* used for incore cyl groups */ | |
289 | time_t cg_time; /* time last written */ | |
290 | long cg_cgx; /* we are the cgx'th cylinder group */ | |
291 | short cg_ncyl; /* number of cyl's this cg */ | |
292 | short cg_niblk; /* number of inode blocks this cg */ | |
293 | long cg_ndblk; /* number of data blocks this cg */ | |
294 | struct csum cg_cs; /* cylinder summary information */ | |
295 | long cg_rotor; /* position of last used block */ | |
296 | long cg_frotor; /* position of last used frag */ | |
297 | long cg_irotor; /* position of last used inode */ | |
298 | long cg_frsum[8]; /* counts of available frags */ | |
299 | long cg_btot[32]; /* block totals per cylinder */ | |
300 | short cg_b[32][8]; /* positions of free blocks */ | |
301 | char cg_iused[256]; /* used inode map */ | |
302 | long cg_magic; /* magic number */ | |
303 | u_char cg_free[1]; /* free block map */ | |
304 | /* actually longer */ | |
305 | }; | |
80cc8328 KM |
306 | |
307 | /* | |
308 | * Turn file system block numbers into disk block addresses. | |
309 | * This maps file system blocks to device size blocks. | |
310 | */ | |
7e2a7a5c KM |
311 | #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb) |
312 | #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb) | |
80cc8328 KM |
313 | |
314 | /* | |
315 | * Cylinder group macros to locate things in cylinder groups. | |
26169eda | 316 | * They calc file system addresses of cylinder group data structures. |
80cc8328 | 317 | */ |
26169eda KM |
318 | #define cgbase(fs, c) ((daddr_t)((fs)->fs_fpg * (c))) |
319 | #define cgstart(fs, c) \ | |
320 | (cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask))) | |
321 | #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */ | |
322 | #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */ | |
323 | #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */ | |
324 | #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */ | |
80cc8328 KM |
325 | |
326 | /* | |
2c9afb08 KM |
327 | * Macros for handling inode numbers: |
328 | * inode number to file system block offset. | |
329 | * inode number to cylinder group number. | |
330 | * inode number to file system block address. | |
80cc8328 | 331 | */ |
6994bf5d KM |
332 | #define itoo(fs, x) ((x) % INOPB(fs)) |
333 | #define itog(fs, x) ((x) / (fs)->fs_ipg) | |
334 | #define itod(fs, x) \ | |
335 | ((daddr_t)(cgimin(fs, itog(fs, x)) + \ | |
c7cd2adb | 336 | (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs)))))) |
80cc8328 | 337 | |
80cc8328 | 338 | /* |
2c9afb08 KM |
339 | * Give cylinder group number for a file system block. |
340 | * Give cylinder group block number for a file system block. | |
80cc8328 | 341 | */ |
6994bf5d KM |
342 | #define dtog(fs, d) ((d) / (fs)->fs_fpg) |
343 | #define dtogd(fs, d) ((d) % (fs)->fs_fpg) | |
80cc8328 | 344 | |
aca50d72 | 345 | /* |
2c9afb08 KM |
346 | * Extract the bits for a block from a map. |
347 | * Compute the cylinder and rotational position of a cyl block addr. | |
aca50d72 | 348 | */ |
2c9afb08 | 349 | #define blkmap(fs, map, loc) \ |
25621fac | 350 | (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag))) |
aca50d72 | 351 | #define cbtocylno(fs, bno) \ |
5a367fe7 | 352 | ((bno) * NSPF(fs) / (fs)->fs_spc) |
aca50d72 | 353 | #define cbtorpos(fs, bno) \ |
3699d961 KM |
354 | (((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \ |
355 | (bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \ | |
e5205031 | 356 | (fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect) |
aca50d72 | 357 | |
c1ab275c KM |
358 | /* |
359 | * The following macros optimize certain frequently calculated | |
360 | * quantities by using shifts and masks in place of divisions | |
361 | * modulos and multiplications. | |
362 | */ | |
363 | #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \ | |
364 | ((loc) & ~(fs)->fs_bmask) | |
365 | #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \ | |
366 | ((loc) & ~(fs)->fs_fmask) | |
beeb484c KM |
367 | #define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \ |
368 | ((blk) << (fs)->fs_bshift) | |
c1ab275c KM |
369 | #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \ |
370 | ((loc) >> (fs)->fs_bshift) | |
371 | #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ | |
372 | ((loc) >> (fs)->fs_fshift) | |
373 | #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \ | |
374 | (((size) + (fs)->fs_bsize - 1) & (fs)->fs_bmask) | |
375 | #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \ | |
376 | (((size) + (fs)->fs_fsize - 1) & (fs)->fs_fmask) | |
c7cd2adb SL |
377 | #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \ |
378 | ((frags) >> (fs)->fs_fragshift) | |
379 | #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \ | |
380 | ((blks) << (fs)->fs_fragshift) | |
6d55d657 KM |
381 | #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \ |
382 | ((fsb) & ((fs)->fs_frag - 1)) | |
383 | #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \ | |
384 | ((fsb) &~ ((fs)->fs_frag - 1)) | |
c7cd2adb SL |
385 | |
386 | /* | |
387 | * Determine the number of available frags given a | |
388 | * percentage to hold in reserve | |
389 | */ | |
390 | #define freespace(fs, percentreserved) \ | |
391 | (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \ | |
392 | (fs)->fs_cstotal.cs_nffree - ((fs)->fs_dsize * (percentreserved) / 100)) | |
c1ab275c | 393 | |
80cc8328 | 394 | /* |
2c9afb08 | 395 | * Determining the size of a file block in the file system. |
80cc8328 KM |
396 | */ |
397 | #define blksize(fs, ip, lbn) \ | |
7e2a7a5c | 398 | (((lbn) >= NDADDR || (ip)->i_size >= ((lbn) + 1) << (fs)->fs_bshift) \ |
c1ab275c KM |
399 | ? (fs)->fs_bsize \ |
400 | : (fragroundup(fs, blkoff(fs, (ip)->i_size)))) | |
80cc8328 | 401 | #define dblksize(fs, dip, lbn) \ |
7e2a7a5c | 402 | (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->fs_bshift) \ |
c1ab275c KM |
403 | ? (fs)->fs_bsize \ |
404 | : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) | |
80cc8328 KM |
405 | |
406 | /* | |
2c9afb08 | 407 | * Number of disk sectors per block; assumes DEV_BSIZE byte sector size. |
80cc8328 | 408 | */ |
7e2a7a5c KM |
409 | #define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift) |
410 | #define NSPF(fs) ((fs)->fs_nspf) | |
80cc8328 KM |
411 | |
412 | /* | |
2c9afb08 | 413 | * INOPB is the number of inodes in a secondary storage block. |
80cc8328 | 414 | */ |
7e2a7a5c KM |
415 | #define INOPB(fs) ((fs)->fs_inopb) |
416 | #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift) | |
80cc8328 KM |
417 | |
418 | /* | |
2c9afb08 | 419 | * NINDIR is the number of indirects in a file system block. |
80cc8328 | 420 | */ |
7e2a7a5c | 421 | #define NINDIR(fs) ((fs)->fs_nindir) |