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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1980, 1989 The Regents of the University of California. | |
3 | * 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 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)mkfs.c 6.18 (Berkeley) 7/3/91"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | #ifndef STANDALONE | |
39 | #include <stdio.h> | |
40 | #include <a.out.h> | |
41 | #endif | |
42 | ||
43 | #include <sys/param.h> | |
44 | #include <sys/time.h> | |
45 | #include <sys/wait.h> | |
46 | #include <sys/resource.h> | |
47 | #include <ufs/dinode.h> | |
48 | #include <ufs/fs.h> | |
49 | #include <ufs/dir.h> | |
50 | #include <sys/disklabel.h> | |
51 | #include <machine/endian.h> | |
52 | ||
53 | /* | |
54 | * make file system for cylinder-group style file systems | |
55 | */ | |
56 | ||
57 | /* | |
58 | * The size of a cylinder group is calculated by CGSIZE. The maximum size | |
59 | * is limited by the fact that cylinder groups are at most one block. | |
60 | * Its size is derived from the size of the maps maintained in the | |
61 | * cylinder group and the (struct cg) size. | |
62 | */ | |
63 | #define CGSIZE(fs) \ | |
64 | /* base cg */ (sizeof(struct cg) + \ | |
65 | /* blktot size */ (fs)->fs_cpg * sizeof(long) + \ | |
66 | /* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(short) + \ | |
67 | /* inode map */ howmany((fs)->fs_ipg, NBBY) + \ | |
68 | /* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY)) | |
69 | ||
70 | /* | |
71 | * We limit the size of the inode map to be no more than a | |
72 | * third of the cylinder group space, since we must leave at | |
73 | * least an equal amount of space for the block map. | |
74 | * | |
75 | * N.B.: MAXIPG must be a multiple of INOPB(fs). | |
76 | */ | |
77 | #define MAXIPG(fs) roundup((fs)->fs_bsize * NBBY / 3, INOPB(fs)) | |
78 | ||
79 | #define UMASK 0755 | |
80 | #define MAXINOPB (MAXBSIZE / sizeof(struct dinode)) | |
81 | #define POWEROF2(num) (((num) & ((num) - 1)) == 0) | |
82 | ||
83 | /* | |
84 | * variables set up by front end. | |
85 | */ | |
86 | extern int mfs; /* run as the memory based filesystem */ | |
87 | extern int Nflag; /* run mkfs without writing file system */ | |
88 | extern int fssize; /* file system size */ | |
89 | extern int ntracks; /* # tracks/cylinder */ | |
90 | extern int nsectors; /* # sectors/track */ | |
91 | extern int nphyssectors; /* # sectors/track including spares */ | |
92 | extern int secpercyl; /* sectors per cylinder */ | |
93 | extern int sectorsize; /* bytes/sector */ | |
94 | extern int rpm; /* revolutions/minute of drive */ | |
95 | extern int interleave; /* hardware sector interleave */ | |
96 | extern int trackskew; /* sector 0 skew, per track */ | |
97 | extern int headswitch; /* head switch time, usec */ | |
98 | extern int trackseek; /* track-to-track seek, usec */ | |
99 | extern int fsize; /* fragment size */ | |
100 | extern int bsize; /* block size */ | |
101 | extern int cpg; /* cylinders/cylinder group */ | |
102 | extern int cpgflg; /* cylinders/cylinder group flag was given */ | |
103 | extern int minfree; /* free space threshold */ | |
104 | extern int opt; /* optimization preference (space or time) */ | |
105 | extern int density; /* number of bytes per inode */ | |
106 | extern int maxcontig; /* max contiguous blocks to allocate */ | |
107 | extern int rotdelay; /* rotational delay between blocks */ | |
108 | extern int maxbpg; /* maximum blocks per file in a cyl group */ | |
109 | extern int nrpos; /* # of distinguished rotational positions */ | |
110 | extern int bbsize; /* boot block size */ | |
111 | extern int sbsize; /* superblock size */ | |
15637ed4 | 112 | extern caddr_t membase; /* start address of memory based filesystem */ |
15637ed4 RG |
113 | |
114 | union { | |
115 | struct fs fs; | |
116 | char pad[SBSIZE]; | |
117 | } fsun; | |
118 | #define sblock fsun.fs | |
119 | struct csum *fscs; | |
120 | ||
121 | union { | |
122 | struct cg cg; | |
123 | char pad[MAXBSIZE]; | |
124 | } cgun; | |
125 | #define acg cgun.cg | |
126 | ||
127 | struct dinode zino[MAXBSIZE / sizeof(struct dinode)]; | |
128 | ||
129 | int fsi, fso; | |
130 | daddr_t alloc(); | |
131 | ||
132 | mkfs(pp, fsys, fi, fo) | |
133 | struct partition *pp; | |
134 | char *fsys; | |
135 | int fi, fo; | |
136 | { | |
137 | register long i, mincpc, mincpg, inospercg; | |
138 | long cylno, rpos, blk, j, warn = 0; | |
139 | long used, mincpgcnt, bpcg; | |
140 | long mapcramped, inodecramped; | |
141 | long postblsize, rotblsize, totalsbsize; | |
15637ed4 | 142 | time_t utime; |
15637ed4 RG |
143 | |
144 | #ifndef STANDALONE | |
145 | time(&utime); | |
146 | #endif | |
15637ed4 RG |
147 | fsi = fi; |
148 | fso = fo; | |
149 | /* | |
150 | * Validate the given file system size. | |
151 | * Verify that its last block can actually be accessed. | |
152 | */ | |
153 | if (fssize <= 0) | |
154 | printf("preposterous size %d\n", fssize), exit(13); | |
155 | wtfs(fssize - 1, sectorsize, (char *)&sblock); | |
156 | /* | |
157 | * collect and verify the sector and track info | |
158 | */ | |
159 | sblock.fs_nsect = nsectors; | |
160 | sblock.fs_ntrak = ntracks; | |
161 | if (sblock.fs_ntrak <= 0) | |
162 | printf("preposterous ntrak %d\n", sblock.fs_ntrak), exit(14); | |
163 | if (sblock.fs_nsect <= 0) | |
164 | printf("preposterous nsect %d\n", sblock.fs_nsect), exit(15); | |
165 | /* | |
166 | * collect and verify the block and fragment sizes | |
167 | */ | |
168 | sblock.fs_bsize = bsize; | |
169 | sblock.fs_fsize = fsize; | |
170 | if (!POWEROF2(sblock.fs_bsize)) { | |
171 | printf("block size must be a power of 2, not %d\n", | |
172 | sblock.fs_bsize); | |
173 | exit(16); | |
174 | } | |
175 | if (!POWEROF2(sblock.fs_fsize)) { | |
176 | printf("fragment size must be a power of 2, not %d\n", | |
177 | sblock.fs_fsize); | |
178 | exit(17); | |
179 | } | |
180 | if (sblock.fs_fsize < sectorsize) { | |
181 | printf("fragment size %d is too small, minimum is %d\n", | |
182 | sblock.fs_fsize, sectorsize); | |
183 | exit(18); | |
184 | } | |
185 | if (sblock.fs_bsize < MINBSIZE) { | |
186 | printf("block size %d is too small, minimum is %d\n", | |
187 | sblock.fs_bsize, MINBSIZE); | |
188 | exit(19); | |
189 | } | |
190 | if (sblock.fs_bsize < sblock.fs_fsize) { | |
191 | printf("block size (%d) cannot be smaller than fragment size (%d)\n", | |
192 | sblock.fs_bsize, sblock.fs_fsize); | |
193 | exit(20); | |
194 | } | |
195 | sblock.fs_bmask = ~(sblock.fs_bsize - 1); | |
196 | sblock.fs_fmask = ~(sblock.fs_fsize - 1); | |
197 | /* | |
198 | * Planning now for future expansion. | |
199 | */ | |
200 | # if (BYTE_ORDER == BIG_ENDIAN) | |
201 | sblock.fs_qbmask.val[0] = 0; | |
202 | sblock.fs_qbmask.val[1] = ~sblock.fs_bmask; | |
203 | sblock.fs_qfmask.val[0] = 0; | |
204 | sblock.fs_qfmask.val[1] = ~sblock.fs_fmask; | |
205 | # endif /* BIG_ENDIAN */ | |
206 | # if (BYTE_ORDER == LITTLE_ENDIAN) | |
207 | sblock.fs_qbmask.val[0] = ~sblock.fs_bmask; | |
208 | sblock.fs_qbmask.val[1] = 0; | |
209 | sblock.fs_qfmask.val[0] = ~sblock.fs_fmask; | |
210 | sblock.fs_qfmask.val[1] = 0; | |
211 | # endif /* LITTLE_ENDIAN */ | |
212 | for (sblock.fs_bshift = 0, i = sblock.fs_bsize; i > 1; i >>= 1) | |
213 | sblock.fs_bshift++; | |
214 | for (sblock.fs_fshift = 0, i = sblock.fs_fsize; i > 1; i >>= 1) | |
215 | sblock.fs_fshift++; | |
216 | sblock.fs_frag = numfrags(&sblock, sblock.fs_bsize); | |
217 | for (sblock.fs_fragshift = 0, i = sblock.fs_frag; i > 1; i >>= 1) | |
218 | sblock.fs_fragshift++; | |
219 | if (sblock.fs_frag > MAXFRAG) { | |
220 | printf("fragment size %d is too small, minimum with block size %d is %d\n", | |
221 | sblock.fs_fsize, sblock.fs_bsize, | |
222 | sblock.fs_bsize / MAXFRAG); | |
223 | exit(21); | |
224 | } | |
225 | sblock.fs_nrpos = nrpos; | |
226 | sblock.fs_nindir = sblock.fs_bsize / sizeof(daddr_t); | |
227 | sblock.fs_inopb = sblock.fs_bsize / sizeof(struct dinode); | |
228 | sblock.fs_nspf = sblock.fs_fsize / sectorsize; | |
229 | for (sblock.fs_fsbtodb = 0, i = NSPF(&sblock); i > 1; i >>= 1) | |
230 | sblock.fs_fsbtodb++; | |
231 | sblock.fs_sblkno = | |
232 | roundup(howmany(bbsize + sbsize, sblock.fs_fsize), sblock.fs_frag); | |
233 | sblock.fs_cblkno = (daddr_t)(sblock.fs_sblkno + | |
234 | roundup(howmany(sbsize, sblock.fs_fsize), sblock.fs_frag)); | |
235 | sblock.fs_iblkno = sblock.fs_cblkno + sblock.fs_frag; | |
236 | sblock.fs_cgoffset = roundup( | |
237 | howmany(sblock.fs_nsect, NSPF(&sblock)), sblock.fs_frag); | |
238 | for (sblock.fs_cgmask = 0xffffffff, i = sblock.fs_ntrak; i > 1; i >>= 1) | |
239 | sblock.fs_cgmask <<= 1; | |
240 | if (!POWEROF2(sblock.fs_ntrak)) | |
241 | sblock.fs_cgmask <<= 1; | |
242 | /* | |
243 | * Validate specified/determined secpercyl | |
244 | * and calculate minimum cylinders per group. | |
245 | */ | |
246 | sblock.fs_spc = secpercyl; | |
247 | for (sblock.fs_cpc = NSPB(&sblock), i = sblock.fs_spc; | |
248 | sblock.fs_cpc > 1 && (i & 1) == 0; | |
249 | sblock.fs_cpc >>= 1, i >>= 1) | |
250 | /* void */; | |
251 | mincpc = sblock.fs_cpc; | |
252 | bpcg = sblock.fs_spc * sectorsize; | |
253 | inospercg = roundup(bpcg / sizeof(struct dinode), INOPB(&sblock)); | |
254 | if (inospercg > MAXIPG(&sblock)) | |
255 | inospercg = MAXIPG(&sblock); | |
256 | used = (sblock.fs_iblkno + inospercg / INOPF(&sblock)) * NSPF(&sblock); | |
257 | mincpgcnt = howmany(sblock.fs_cgoffset * (~sblock.fs_cgmask) + used, | |
258 | sblock.fs_spc); | |
259 | mincpg = roundup(mincpgcnt, mincpc); | |
260 | /* | |
261 | * Insure that cylinder group with mincpg has enough space | |
262 | * for block maps | |
263 | */ | |
264 | sblock.fs_cpg = mincpg; | |
265 | sblock.fs_ipg = inospercg; | |
266 | mapcramped = 0; | |
267 | while (CGSIZE(&sblock) > sblock.fs_bsize) { | |
268 | mapcramped = 1; | |
269 | if (sblock.fs_bsize < MAXBSIZE) { | |
270 | sblock.fs_bsize <<= 1; | |
271 | if ((i & 1) == 0) { | |
272 | i >>= 1; | |
273 | } else { | |
274 | sblock.fs_cpc <<= 1; | |
275 | mincpc <<= 1; | |
276 | mincpg = roundup(mincpgcnt, mincpc); | |
277 | sblock.fs_cpg = mincpg; | |
278 | } | |
279 | sblock.fs_frag <<= 1; | |
280 | sblock.fs_fragshift += 1; | |
281 | if (sblock.fs_frag <= MAXFRAG) | |
282 | continue; | |
283 | } | |
284 | if (sblock.fs_fsize == sblock.fs_bsize) { | |
285 | printf("There is no block size that"); | |
286 | printf(" can support this disk\n"); | |
287 | exit(22); | |
288 | } | |
289 | sblock.fs_frag >>= 1; | |
290 | sblock.fs_fragshift -= 1; | |
291 | sblock.fs_fsize <<= 1; | |
292 | sblock.fs_nspf <<= 1; | |
293 | } | |
294 | /* | |
295 | * Insure that cylinder group with mincpg has enough space for inodes | |
296 | */ | |
297 | inodecramped = 0; | |
298 | used *= sectorsize; | |
299 | inospercg = roundup((mincpg * bpcg - used) / density, INOPB(&sblock)); | |
300 | sblock.fs_ipg = inospercg; | |
301 | while (inospercg > MAXIPG(&sblock)) { | |
302 | inodecramped = 1; | |
303 | if (mincpc == 1 || sblock.fs_frag == 1 || | |
304 | sblock.fs_bsize == MINBSIZE) | |
305 | break; | |
306 | printf("With a block size of %d %s %d\n", sblock.fs_bsize, | |
307 | "minimum bytes per inode is", | |
308 | (mincpg * bpcg - used) / MAXIPG(&sblock) + 1); | |
309 | sblock.fs_bsize >>= 1; | |
310 | sblock.fs_frag >>= 1; | |
311 | sblock.fs_fragshift -= 1; | |
312 | mincpc >>= 1; | |
313 | sblock.fs_cpg = roundup(mincpgcnt, mincpc); | |
314 | if (CGSIZE(&sblock) > sblock.fs_bsize) { | |
315 | sblock.fs_bsize <<= 1; | |
316 | break; | |
317 | } | |
318 | mincpg = sblock.fs_cpg; | |
319 | inospercg = | |
320 | roundup((mincpg * bpcg - used) / density, INOPB(&sblock)); | |
321 | sblock.fs_ipg = inospercg; | |
322 | } | |
323 | if (inodecramped) { | |
324 | if (inospercg > MAXIPG(&sblock)) { | |
325 | printf("Minimum bytes per inode is %d\n", | |
326 | (mincpg * bpcg - used) / MAXIPG(&sblock) + 1); | |
327 | } else if (!mapcramped) { | |
328 | printf("With %d bytes per inode, ", density); | |
329 | printf("minimum cylinders per group is %d\n", mincpg); | |
330 | } | |
331 | } | |
332 | if (mapcramped) { | |
333 | printf("With %d sectors per cylinder, ", sblock.fs_spc); | |
334 | printf("minimum cylinders per group is %d\n", mincpg); | |
335 | } | |
336 | if (inodecramped || mapcramped) { | |
337 | if (sblock.fs_bsize != bsize) | |
338 | printf("%s to be changed from %d to %d\n", | |
339 | "This requires the block size", | |
340 | bsize, sblock.fs_bsize); | |
341 | if (sblock.fs_fsize != fsize) | |
342 | printf("\t%s to be changed from %d to %d\n", | |
343 | "and the fragment size", | |
344 | fsize, sblock.fs_fsize); | |
345 | exit(23); | |
346 | } | |
347 | /* | |
348 | * Calculate the number of cylinders per group | |
349 | */ | |
350 | sblock.fs_cpg = cpg; | |
351 | if (sblock.fs_cpg % mincpc != 0) { | |
352 | printf("%s groups must have a multiple of %d cylinders\n", | |
353 | cpgflg ? "Cylinder" : "Warning: cylinder", mincpc); | |
354 | sblock.fs_cpg = roundup(sblock.fs_cpg, mincpc); | |
355 | if (!cpgflg) | |
356 | cpg = sblock.fs_cpg; | |
357 | } | |
358 | /* | |
359 | * Must insure there is enough space for inodes | |
360 | */ | |
361 | sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density, | |
362 | INOPB(&sblock)); | |
363 | while (sblock.fs_ipg > MAXIPG(&sblock)) { | |
364 | inodecramped = 1; | |
365 | sblock.fs_cpg -= mincpc; | |
366 | sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density, | |
367 | INOPB(&sblock)); | |
368 | } | |
369 | /* | |
370 | * Must insure there is enough space to hold block map | |
371 | */ | |
372 | while (CGSIZE(&sblock) > sblock.fs_bsize) { | |
373 | mapcramped = 1; | |
374 | sblock.fs_cpg -= mincpc; | |
375 | sblock.fs_ipg = roundup((sblock.fs_cpg * bpcg - used) / density, | |
376 | INOPB(&sblock)); | |
377 | } | |
378 | sblock.fs_fpg = (sblock.fs_cpg * sblock.fs_spc) / NSPF(&sblock); | |
379 | if ((sblock.fs_cpg * sblock.fs_spc) % NSPB(&sblock) != 0) { | |
380 | printf("panic (fs_cpg * fs_spc) % NSPF != 0"); | |
381 | exit(24); | |
382 | } | |
383 | if (sblock.fs_cpg < mincpg) { | |
384 | printf("cylinder groups must have at least %d cylinders\n", | |
385 | mincpg); | |
386 | exit(25); | |
387 | } else if (sblock.fs_cpg != cpg) { | |
388 | if (!cpgflg) | |
389 | printf("Warning: "); | |
390 | else if (!mapcramped && !inodecramped) | |
391 | exit(26); | |
392 | if (mapcramped && inodecramped) | |
393 | printf("Block size and bytes per inode restrict"); | |
394 | else if (mapcramped) | |
395 | printf("Block size restricts"); | |
396 | else | |
397 | printf("Bytes per inode restrict"); | |
398 | printf(" cylinders per group to %d.\n", sblock.fs_cpg); | |
399 | if (cpgflg) | |
400 | exit(27); | |
401 | } | |
402 | sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock)); | |
403 | /* | |
404 | * Now have size for file system and nsect and ntrak. | |
405 | * Determine number of cylinders and blocks in the file system. | |
406 | */ | |
407 | sblock.fs_size = fssize = dbtofsb(&sblock, fssize); | |
408 | sblock.fs_ncyl = fssize * NSPF(&sblock) / sblock.fs_spc; | |
409 | if (fssize * NSPF(&sblock) > sblock.fs_ncyl * sblock.fs_spc) { | |
410 | sblock.fs_ncyl++; | |
411 | warn = 1; | |
412 | } | |
413 | if (sblock.fs_ncyl < 1) { | |
414 | printf("file systems must have at least one cylinder\n"); | |
415 | exit(28); | |
416 | } | |
417 | /* | |
418 | * Determine feasability/values of rotational layout tables. | |
419 | * | |
420 | * The size of the rotational layout tables is limited by the | |
421 | * size of the superblock, SBSIZE. The amount of space available | |
422 | * for tables is calculated as (SBSIZE - sizeof (struct fs)). | |
423 | * The size of these tables is inversely proportional to the block | |
424 | * size of the file system. The size increases if sectors per track | |
425 | * are not powers of two, because more cylinders must be described | |
426 | * by the tables before the rotational pattern repeats (fs_cpc). | |
427 | */ | |
428 | sblock.fs_interleave = interleave; | |
429 | sblock.fs_trackskew = trackskew; | |
430 | sblock.fs_npsect = nphyssectors; | |
431 | sblock.fs_postblformat = FS_DYNAMICPOSTBLFMT; | |
432 | sblock.fs_sbsize = fragroundup(&sblock, sizeof(struct fs)); | |
433 | if (sblock.fs_ntrak == 1) { | |
434 | sblock.fs_cpc = 0; | |
435 | goto next; | |
436 | } | |
437 | postblsize = sblock.fs_nrpos * sblock.fs_cpc * sizeof(short); | |
438 | rotblsize = sblock.fs_cpc * sblock.fs_spc / NSPB(&sblock); | |
439 | totalsbsize = sizeof(struct fs) + rotblsize; | |
440 | if (sblock.fs_nrpos == 8 && sblock.fs_cpc <= 16) { | |
441 | /* use old static table space */ | |
442 | sblock.fs_postbloff = (char *)(&sblock.fs_opostbl[0][0]) - | |
443 | (char *)(&sblock.fs_link); | |
444 | sblock.fs_rotbloff = &sblock.fs_space[0] - | |
445 | (u_char *)(&sblock.fs_link); | |
446 | } else { | |
447 | /* use dynamic table space */ | |
448 | sblock.fs_postbloff = &sblock.fs_space[0] - | |
449 | (u_char *)(&sblock.fs_link); | |
450 | sblock.fs_rotbloff = sblock.fs_postbloff + postblsize; | |
451 | totalsbsize += postblsize; | |
452 | } | |
453 | if (totalsbsize > SBSIZE || | |
454 | sblock.fs_nsect > (1 << NBBY) * NSPB(&sblock)) { | |
455 | printf("%s %s %d %s %d.%s", | |
456 | "Warning: insufficient space in super block for\n", | |
457 | "rotational layout tables with nsect", sblock.fs_nsect, | |
458 | "and ntrak", sblock.fs_ntrak, | |
459 | "\nFile system performance may be impaired.\n"); | |
460 | sblock.fs_cpc = 0; | |
461 | goto next; | |
462 | } | |
463 | sblock.fs_sbsize = fragroundup(&sblock, totalsbsize); | |
464 | /* | |
465 | * calculate the available blocks for each rotational position | |
466 | */ | |
467 | for (cylno = 0; cylno < sblock.fs_cpc; cylno++) | |
468 | for (rpos = 0; rpos < sblock.fs_nrpos; rpos++) | |
469 | fs_postbl(&sblock, cylno)[rpos] = -1; | |
470 | for (i = (rotblsize - 1) * sblock.fs_frag; | |
471 | i >= 0; i -= sblock.fs_frag) { | |
472 | cylno = cbtocylno(&sblock, i); | |
473 | rpos = cbtorpos(&sblock, i); | |
474 | blk = fragstoblks(&sblock, i); | |
475 | if (fs_postbl(&sblock, cylno)[rpos] == -1) | |
476 | fs_rotbl(&sblock)[blk] = 0; | |
477 | else | |
478 | fs_rotbl(&sblock)[blk] = | |
479 | fs_postbl(&sblock, cylno)[rpos] - blk; | |
480 | fs_postbl(&sblock, cylno)[rpos] = blk; | |
481 | } | |
482 | next: | |
483 | /* | |
484 | * Compute/validate number of cylinder groups. | |
485 | */ | |
486 | sblock.fs_ncg = sblock.fs_ncyl / sblock.fs_cpg; | |
487 | if (sblock.fs_ncyl % sblock.fs_cpg) | |
488 | sblock.fs_ncg++; | |
489 | sblock.fs_dblkno = sblock.fs_iblkno + sblock.fs_ipg / INOPF(&sblock); | |
490 | i = MIN(~sblock.fs_cgmask, sblock.fs_ncg - 1); | |
491 | if (cgdmin(&sblock, i) - cgbase(&sblock, i) >= sblock.fs_fpg) { | |
492 | printf("inode blocks/cyl group (%d) >= data blocks (%d)\n", | |
493 | cgdmin(&sblock, i) - cgbase(&sblock, i) / sblock.fs_frag, | |
494 | sblock.fs_fpg / sblock.fs_frag); | |
495 | printf("number of cylinders per cylinder group (%d) %s.\n", | |
496 | sblock.fs_cpg, "must be increased"); | |
497 | exit(29); | |
498 | } | |
499 | j = sblock.fs_ncg - 1; | |
500 | if ((i = fssize - j * sblock.fs_fpg) < sblock.fs_fpg && | |
501 | cgdmin(&sblock, j) - cgbase(&sblock, j) > i) { | |
502 | if (j == 0) { | |
503 | printf("Filesystem must have at least %d sectors\n", | |
504 | NSPF(&sblock) * | |
505 | (cgdmin(&sblock, 0) + 3 * sblock.fs_frag)); | |
506 | exit(30); | |
507 | } | |
508 | printf("Warning: inode blocks/cyl group (%d) >= data blocks (%d) in last\n", | |
509 | (cgdmin(&sblock, j) - cgbase(&sblock, j)) / sblock.fs_frag, | |
510 | i / sblock.fs_frag); | |
511 | printf(" cylinder group. This implies %d sector(s) cannot be allocated.\n", | |
512 | i * NSPF(&sblock)); | |
513 | sblock.fs_ncg--; | |
514 | sblock.fs_ncyl -= sblock.fs_ncyl % sblock.fs_cpg; | |
515 | sblock.fs_size = fssize = sblock.fs_ncyl * sblock.fs_spc / | |
516 | NSPF(&sblock); | |
517 | warn = 0; | |
518 | } | |
519 | if (warn && !mfs) { | |
520 | printf("Warning: %d sector(s) in last cylinder unallocated\n", | |
521 | sblock.fs_spc - | |
522 | (fssize * NSPF(&sblock) - (sblock.fs_ncyl - 1) | |
523 | * sblock.fs_spc)); | |
524 | } | |
525 | /* | |
526 | * fill in remaining fields of the super block | |
527 | */ | |
528 | sblock.fs_csaddr = cgdmin(&sblock, 0); | |
529 | sblock.fs_cssize = | |
530 | fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum)); | |
531 | i = sblock.fs_bsize / sizeof(struct csum); | |
532 | sblock.fs_csmask = ~(i - 1); | |
533 | for (sblock.fs_csshift = 0; i > 1; i >>= 1) | |
534 | sblock.fs_csshift++; | |
535 | fscs = (struct csum *)calloc(1, sblock.fs_cssize); | |
536 | sblock.fs_magic = FS_MAGIC; | |
537 | sblock.fs_rotdelay = rotdelay; | |
538 | sblock.fs_minfree = minfree; | |
539 | sblock.fs_maxcontig = maxcontig; | |
540 | sblock.fs_headswitch = headswitch; | |
541 | sblock.fs_trkseek = trackseek; | |
542 | sblock.fs_maxbpg = maxbpg; | |
543 | sblock.fs_rps = rpm / 60; | |
544 | sblock.fs_optim = opt; | |
545 | sblock.fs_cgrotor = 0; | |
546 | sblock.fs_cstotal.cs_ndir = 0; | |
547 | sblock.fs_cstotal.cs_nbfree = 0; | |
548 | sblock.fs_cstotal.cs_nifree = 0; | |
549 | sblock.fs_cstotal.cs_nffree = 0; | |
550 | sblock.fs_fmod = 0; | |
551 | sblock.fs_ronly = 0; | |
552 | /* | |
553 | * Dump out summary information about file system. | |
554 | */ | |
555 | if (!mfs) { | |
556 | printf("%s:\t%d sectors in %d %s of %d tracks, %d sectors\n", | |
557 | fsys, sblock.fs_size * NSPF(&sblock), sblock.fs_ncyl, | |
558 | "cylinders", sblock.fs_ntrak, sblock.fs_nsect); | |
559 | printf("\t%.1fMB in %d cyl groups (%d c/g, %.2fMB/g, %d i/g)\n", | |
560 | (float)sblock.fs_size * sblock.fs_fsize * 1e-6, | |
561 | sblock.fs_ncg, sblock.fs_cpg, | |
562 | (float)sblock.fs_fpg * sblock.fs_fsize * 1e-6, | |
563 | sblock.fs_ipg); | |
564 | } | |
565 | /* | |
566 | * Now build the cylinders group blocks and | |
567 | * then print out indices of cylinder groups. | |
568 | */ | |
569 | if (!mfs) | |
570 | printf("super-block backups (for fsck -b #) at:"); | |
571 | for (cylno = 0; cylno < sblock.fs_ncg; cylno++) { | |
572 | initcg(cylno, utime); | |
573 | if (mfs) | |
574 | continue; | |
575 | if (cylno % 9 == 0) | |
576 | printf("\n"); | |
577 | printf(" %d,", fsbtodb(&sblock, cgsblock(&sblock, cylno))); | |
578 | } | |
579 | if (!mfs) | |
580 | printf("\n"); | |
581 | if (Nflag && !mfs) | |
582 | exit(0); | |
583 | /* | |
584 | * Now construct the initial file system, | |
585 | * then write out the super-block. | |
586 | */ | |
587 | fsinit(utime); | |
588 | sblock.fs_time = utime; | |
589 | wtfs(SBOFF / sectorsize, sbsize, (char *)&sblock); | |
590 | for (i = 0; i < sblock.fs_cssize; i += sblock.fs_bsize) | |
591 | wtfs(fsbtodb(&sblock, sblock.fs_csaddr + numfrags(&sblock, i)), | |
592 | sblock.fs_cssize - i < sblock.fs_bsize ? | |
593 | sblock.fs_cssize - i : sblock.fs_bsize, | |
594 | ((char *)fscs) + i); | |
595 | /* | |
596 | * Write out the duplicate super blocks | |
597 | */ | |
598 | for (cylno = 0; cylno < sblock.fs_ncg; cylno++) | |
599 | wtfs(fsbtodb(&sblock, cgsblock(&sblock, cylno)), | |
600 | sbsize, (char *)&sblock); | |
601 | /* | |
602 | * Update information about this partion in pack | |
603 | * label, to that it may be updated on disk. | |
604 | */ | |
605 | pp->p_fstype = FS_BSDFFS; | |
606 | pp->p_fsize = sblock.fs_fsize; | |
607 | pp->p_frag = sblock.fs_frag; | |
608 | pp->p_cpg = sblock.fs_cpg; | |
15637ed4 RG |
609 | } |
610 | ||
611 | /* | |
612 | * Initialize a cylinder group. | |
613 | */ | |
614 | initcg(cylno, utime) | |
615 | int cylno; | |
616 | time_t utime; | |
617 | { | |
618 | daddr_t cbase, d, dlower, dupper, dmax; | |
619 | long i, j, s; | |
620 | register struct csum *cs; | |
621 | ||
622 | /* | |
623 | * Determine block bounds for cylinder group. | |
624 | * Allow space for super block summary information in first | |
625 | * cylinder group. | |
626 | */ | |
627 | cbase = cgbase(&sblock, cylno); | |
628 | dmax = cbase + sblock.fs_fpg; | |
629 | if (dmax > sblock.fs_size) | |
630 | dmax = sblock.fs_size; | |
631 | dlower = cgsblock(&sblock, cylno) - cbase; | |
632 | dupper = cgdmin(&sblock, cylno) - cbase; | |
633 | if (cylno == 0) | |
634 | dupper += howmany(sblock.fs_cssize, sblock.fs_fsize); | |
635 | cs = fscs + cylno; | |
636 | acg.cg_time = utime; | |
637 | acg.cg_magic = CG_MAGIC; | |
638 | acg.cg_cgx = cylno; | |
639 | if (cylno == sblock.fs_ncg - 1) | |
640 | acg.cg_ncyl = sblock.fs_ncyl % sblock.fs_cpg; | |
641 | else | |
642 | acg.cg_ncyl = sblock.fs_cpg; | |
643 | acg.cg_niblk = sblock.fs_ipg; | |
644 | acg.cg_ndblk = dmax - cbase; | |
645 | acg.cg_cs.cs_ndir = 0; | |
646 | acg.cg_cs.cs_nffree = 0; | |
647 | acg.cg_cs.cs_nbfree = 0; | |
648 | acg.cg_cs.cs_nifree = 0; | |
649 | acg.cg_rotor = 0; | |
650 | acg.cg_frotor = 0; | |
651 | acg.cg_irotor = 0; | |
652 | acg.cg_btotoff = &acg.cg_space[0] - (u_char *)(&acg.cg_link); | |
653 | acg.cg_boff = acg.cg_btotoff + sblock.fs_cpg * sizeof(long); | |
654 | acg.cg_iusedoff = acg.cg_boff + | |
655 | sblock.fs_cpg * sblock.fs_nrpos * sizeof(short); | |
656 | acg.cg_freeoff = acg.cg_iusedoff + howmany(sblock.fs_ipg, NBBY); | |
657 | acg.cg_nextfreeoff = acg.cg_freeoff + | |
658 | howmany(sblock.fs_cpg * sblock.fs_spc / NSPF(&sblock), NBBY); | |
659 | for (i = 0; i < sblock.fs_frag; i++) { | |
660 | acg.cg_frsum[i] = 0; | |
661 | } | |
662 | bzero((caddr_t)cg_inosused(&acg), acg.cg_freeoff - acg.cg_iusedoff); | |
663 | acg.cg_cs.cs_nifree += sblock.fs_ipg; | |
664 | if (cylno == 0) | |
665 | for (i = 0; i < ROOTINO; i++) { | |
666 | setbit(cg_inosused(&acg), i); | |
667 | acg.cg_cs.cs_nifree--; | |
668 | } | |
669 | for (i = 0; i < sblock.fs_ipg / INOPF(&sblock); i += sblock.fs_frag) | |
670 | wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i), | |
671 | sblock.fs_bsize, (char *)zino); | |
672 | bzero((caddr_t)cg_blktot(&acg), acg.cg_boff - acg.cg_btotoff); | |
673 | bzero((caddr_t)cg_blks(&sblock, &acg, 0), | |
674 | acg.cg_iusedoff - acg.cg_boff); | |
675 | bzero((caddr_t)cg_blksfree(&acg), acg.cg_nextfreeoff - acg.cg_freeoff); | |
676 | if (cylno > 0) { | |
677 | /* | |
678 | * In cylno 0, beginning space is reserved | |
679 | * for boot and super blocks. | |
680 | */ | |
681 | for (d = 0; d < dlower; d += sblock.fs_frag) { | |
682 | setblock(&sblock, cg_blksfree(&acg), d/sblock.fs_frag); | |
683 | acg.cg_cs.cs_nbfree++; | |
684 | cg_blktot(&acg)[cbtocylno(&sblock, d)]++; | |
685 | cg_blks(&sblock, &acg, cbtocylno(&sblock, d)) | |
686 | [cbtorpos(&sblock, d)]++; | |
687 | } | |
688 | sblock.fs_dsize += dlower; | |
689 | } | |
690 | sblock.fs_dsize += acg.cg_ndblk - dupper; | |
691 | if (i = dupper % sblock.fs_frag) { | |
692 | acg.cg_frsum[sblock.fs_frag - i]++; | |
693 | for (d = dupper + sblock.fs_frag - i; dupper < d; dupper++) { | |
694 | setbit(cg_blksfree(&acg), dupper); | |
695 | acg.cg_cs.cs_nffree++; | |
696 | } | |
697 | } | |
698 | for (d = dupper; d + sblock.fs_frag <= dmax - cbase; ) { | |
699 | setblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag); | |
700 | acg.cg_cs.cs_nbfree++; | |
701 | cg_blktot(&acg)[cbtocylno(&sblock, d)]++; | |
702 | cg_blks(&sblock, &acg, cbtocylno(&sblock, d)) | |
703 | [cbtorpos(&sblock, d)]++; | |
704 | d += sblock.fs_frag; | |
705 | } | |
706 | if (d < dmax - cbase) { | |
707 | acg.cg_frsum[dmax - cbase - d]++; | |
708 | for (; d < dmax - cbase; d++) { | |
709 | setbit(cg_blksfree(&acg), d); | |
710 | acg.cg_cs.cs_nffree++; | |
711 | } | |
712 | } | |
713 | sblock.fs_cstotal.cs_ndir += acg.cg_cs.cs_ndir; | |
714 | sblock.fs_cstotal.cs_nffree += acg.cg_cs.cs_nffree; | |
715 | sblock.fs_cstotal.cs_nbfree += acg.cg_cs.cs_nbfree; | |
716 | sblock.fs_cstotal.cs_nifree += acg.cg_cs.cs_nifree; | |
717 | *cs = acg.cg_cs; | |
718 | wtfs(fsbtodb(&sblock, cgtod(&sblock, cylno)), | |
719 | sblock.fs_bsize, (char *)&acg); | |
720 | } | |
721 | ||
722 | /* | |
723 | * initialize the file system | |
724 | */ | |
725 | struct dinode node; | |
726 | ||
727 | #ifdef LOSTDIR | |
728 | #define PREDEFDIR 3 | |
729 | #else | |
730 | #define PREDEFDIR 2 | |
731 | #endif | |
732 | ||
733 | struct direct root_dir[] = { | |
734 | { ROOTINO, sizeof(struct direct), 1, "." }, | |
735 | { ROOTINO, sizeof(struct direct), 2, ".." }, | |
736 | #ifdef LOSTDIR | |
737 | { LOSTFOUNDINO, sizeof(struct direct), 10, "lost+found" }, | |
738 | #endif | |
739 | }; | |
740 | #ifdef LOSTDIR | |
741 | struct direct lost_found_dir[] = { | |
742 | { LOSTFOUNDINO, sizeof(struct direct), 1, "." }, | |
743 | { ROOTINO, sizeof(struct direct), 2, ".." }, | |
744 | { 0, DIRBLKSIZ, 0, 0 }, | |
745 | }; | |
746 | #endif | |
747 | char buf[MAXBSIZE]; | |
748 | ||
749 | fsinit(utime) | |
750 | time_t utime; | |
751 | { | |
752 | int i; | |
753 | ||
754 | /* | |
755 | * initialize the node | |
756 | */ | |
757 | node.di_atime = utime; | |
758 | node.di_mtime = utime; | |
759 | node.di_ctime = utime; | |
760 | #ifdef LOSTDIR | |
761 | /* | |
762 | * create the lost+found directory | |
763 | */ | |
764 | (void)makedir(lost_found_dir, 2); | |
765 | for (i = DIRBLKSIZ; i < sblock.fs_bsize; i += DIRBLKSIZ) | |
766 | bcopy(&lost_found_dir[2], &buf[i], DIRSIZ(&lost_found_dir[2])); | |
767 | node.di_mode = IFDIR | UMASK; | |
768 | node.di_nlink = 2; | |
769 | node.di_size = sblock.fs_bsize; | |
770 | node.di_db[0] = alloc(node.di_size, node.di_mode); | |
771 | node.di_blocks = btodb(fragroundup(&sblock, node.di_size)); | |
772 | wtfs(fsbtodb(&sblock, node.di_db[0]), node.di_size, buf); | |
773 | iput(&node, LOSTFOUNDINO); | |
774 | #endif | |
775 | /* | |
776 | * create the root directory | |
777 | */ | |
778 | if (mfs) | |
779 | node.di_mode = IFDIR | 01777; | |
780 | else | |
781 | node.di_mode = IFDIR | UMASK; | |
782 | node.di_nlink = PREDEFDIR; | |
783 | node.di_size = makedir(root_dir, PREDEFDIR); | |
784 | node.di_db[0] = alloc(sblock.fs_fsize, node.di_mode); | |
785 | node.di_blocks = btodb(fragroundup(&sblock, node.di_size)); | |
786 | wtfs(fsbtodb(&sblock, node.di_db[0]), sblock.fs_fsize, buf); | |
787 | iput(&node, ROOTINO); | |
788 | } | |
789 | ||
790 | /* | |
791 | * construct a set of directory entries in "buf". | |
792 | * return size of directory. | |
793 | */ | |
794 | makedir(protodir, entries) | |
795 | register struct direct *protodir; | |
796 | int entries; | |
797 | { | |
798 | char *cp; | |
799 | int i, spcleft; | |
800 | ||
801 | spcleft = DIRBLKSIZ; | |
802 | for (cp = buf, i = 0; i < entries - 1; i++) { | |
803 | protodir[i].d_reclen = DIRSIZ(&protodir[i]); | |
804 | bcopy(&protodir[i], cp, protodir[i].d_reclen); | |
805 | cp += protodir[i].d_reclen; | |
806 | spcleft -= protodir[i].d_reclen; | |
807 | } | |
808 | protodir[i].d_reclen = spcleft; | |
809 | bcopy(&protodir[i], cp, DIRSIZ(&protodir[i])); | |
810 | return (DIRBLKSIZ); | |
811 | } | |
812 | ||
813 | /* | |
814 | * allocate a block or frag | |
815 | */ | |
816 | daddr_t | |
817 | alloc(size, mode) | |
818 | int size; | |
819 | int mode; | |
820 | { | |
821 | int i, frag; | |
822 | daddr_t d; | |
823 | ||
824 | rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, | |
825 | (char *)&acg); | |
826 | if (acg.cg_magic != CG_MAGIC) { | |
827 | printf("cg 0: bad magic number\n"); | |
828 | return (0); | |
829 | } | |
830 | if (acg.cg_cs.cs_nbfree == 0) { | |
831 | printf("first cylinder group ran out of space\n"); | |
832 | return (0); | |
833 | } | |
834 | for (d = 0; d < acg.cg_ndblk; d += sblock.fs_frag) | |
835 | if (isblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag)) | |
836 | goto goth; | |
837 | printf("internal error: can't find block in cyl 0\n"); | |
838 | return (0); | |
839 | goth: | |
840 | clrblock(&sblock, cg_blksfree(&acg), d / sblock.fs_frag); | |
841 | acg.cg_cs.cs_nbfree--; | |
842 | sblock.fs_cstotal.cs_nbfree--; | |
843 | fscs[0].cs_nbfree--; | |
844 | if (mode & IFDIR) { | |
845 | acg.cg_cs.cs_ndir++; | |
846 | sblock.fs_cstotal.cs_ndir++; | |
847 | fscs[0].cs_ndir++; | |
848 | } | |
849 | cg_blktot(&acg)[cbtocylno(&sblock, d)]--; | |
850 | cg_blks(&sblock, &acg, cbtocylno(&sblock, d))[cbtorpos(&sblock, d)]--; | |
851 | if (size != sblock.fs_bsize) { | |
852 | frag = howmany(size, sblock.fs_fsize); | |
853 | fscs[0].cs_nffree += sblock.fs_frag - frag; | |
854 | sblock.fs_cstotal.cs_nffree += sblock.fs_frag - frag; | |
855 | acg.cg_cs.cs_nffree += sblock.fs_frag - frag; | |
856 | acg.cg_frsum[sblock.fs_frag - frag]++; | |
857 | for (i = frag; i < sblock.fs_frag; i++) | |
858 | setbit(cg_blksfree(&acg), d + i); | |
859 | } | |
860 | wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, | |
861 | (char *)&acg); | |
862 | return (d); | |
863 | } | |
864 | ||
865 | /* | |
866 | * Allocate an inode on the disk | |
867 | */ | |
868 | iput(ip, ino) | |
869 | register struct dinode *ip; | |
870 | register ino_t ino; | |
871 | { | |
872 | struct dinode buf[MAXINOPB]; | |
873 | daddr_t d; | |
874 | int c; | |
875 | ||
876 | c = itog(&sblock, ino); | |
877 | rdfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, | |
878 | (char *)&acg); | |
879 | if (acg.cg_magic != CG_MAGIC) { | |
880 | printf("cg 0: bad magic number\n"); | |
881 | exit(31); | |
882 | } | |
883 | acg.cg_cs.cs_nifree--; | |
884 | setbit(cg_inosused(&acg), ino); | |
885 | wtfs(fsbtodb(&sblock, cgtod(&sblock, 0)), sblock.fs_cgsize, | |
886 | (char *)&acg); | |
887 | sblock.fs_cstotal.cs_nifree--; | |
888 | fscs[0].cs_nifree--; | |
889 | if (ino >= sblock.fs_ipg * sblock.fs_ncg) { | |
890 | printf("fsinit: inode value out of range (%d).\n", ino); | |
891 | exit(32); | |
892 | } | |
893 | d = fsbtodb(&sblock, itod(&sblock, ino)); | |
894 | rdfs(d, sblock.fs_bsize, buf); | |
895 | buf[itoo(&sblock, ino)] = *ip; | |
896 | wtfs(d, sblock.fs_bsize, buf); | |
897 | } | |
898 | ||
15637ed4 RG |
899 | /* |
900 | * read a block from the file system | |
901 | */ | |
902 | rdfs(bno, size, bf) | |
903 | daddr_t bno; | |
904 | int size; | |
905 | char *bf; | |
906 | { | |
907 | int n; | |
908 | ||
909 | if (mfs) { | |
910 | bcopy(membase + bno * sectorsize, bf, size); | |
911 | return; | |
912 | } | |
913 | if (lseek(fsi, bno * sectorsize, 0) < 0) { | |
914 | printf("seek error: %ld\n", bno); | |
915 | perror("rdfs"); | |
916 | exit(33); | |
917 | } | |
918 | n = read(fsi, bf, size); | |
919 | if(n != size) { | |
920 | printf("read error: %ld\n", bno); | |
921 | perror("rdfs"); | |
922 | exit(34); | |
923 | } | |
924 | } | |
925 | ||
926 | /* | |
927 | * write a block to the file system | |
928 | */ | |
929 | wtfs(bno, size, bf) | |
930 | daddr_t bno; | |
931 | int size; | |
932 | char *bf; | |
933 | { | |
934 | int n; | |
935 | ||
936 | if (mfs) { | |
937 | bcopy(bf, membase + bno * sectorsize, size); | |
938 | return; | |
939 | } | |
940 | if (Nflag) | |
941 | return; | |
942 | if (lseek(fso, bno * sectorsize, 0) < 0) { | |
943 | printf("seek error: %ld\n", bno); | |
944 | perror("wtfs"); | |
945 | exit(35); | |
946 | } | |
947 | n = write(fso, bf, size); | |
948 | if(n != size) { | |
949 | printf("write error: %ld\n", bno); | |
950 | perror("wtfs"); | |
951 | exit(36); | |
952 | } | |
953 | } | |
954 | ||
955 | /* | |
956 | * check if a block is available | |
957 | */ | |
958 | isblock(fs, cp, h) | |
959 | struct fs *fs; | |
960 | unsigned char *cp; | |
961 | int h; | |
962 | { | |
963 | unsigned char mask; | |
964 | ||
965 | switch (fs->fs_frag) { | |
966 | case 8: | |
967 | return (cp[h] == 0xff); | |
968 | case 4: | |
969 | mask = 0x0f << ((h & 0x1) << 2); | |
970 | return ((cp[h >> 1] & mask) == mask); | |
971 | case 2: | |
972 | mask = 0x03 << ((h & 0x3) << 1); | |
973 | return ((cp[h >> 2] & mask) == mask); | |
974 | case 1: | |
975 | mask = 0x01 << (h & 0x7); | |
976 | return ((cp[h >> 3] & mask) == mask); | |
977 | default: | |
978 | #ifdef STANDALONE | |
979 | printf("isblock bad fs_frag %d\n", fs->fs_frag); | |
980 | #else | |
981 | fprintf(stderr, "isblock bad fs_frag %d\n", fs->fs_frag); | |
982 | #endif | |
983 | return (0); | |
984 | } | |
985 | } | |
986 | ||
987 | /* | |
988 | * take a block out of the map | |
989 | */ | |
990 | clrblock(fs, cp, h) | |
991 | struct fs *fs; | |
992 | unsigned char *cp; | |
993 | int h; | |
994 | { | |
995 | switch ((fs)->fs_frag) { | |
996 | case 8: | |
997 | cp[h] = 0; | |
998 | return; | |
999 | case 4: | |
1000 | cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2)); | |
1001 | return; | |
1002 | case 2: | |
1003 | cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1)); | |
1004 | return; | |
1005 | case 1: | |
1006 | cp[h >> 3] &= ~(0x01 << (h & 0x7)); | |
1007 | return; | |
1008 | default: | |
1009 | #ifdef STANDALONE | |
1010 | printf("clrblock bad fs_frag %d\n", fs->fs_frag); | |
1011 | #else | |
1012 | fprintf(stderr, "clrblock bad fs_frag %d\n", fs->fs_frag); | |
1013 | #endif | |
1014 | return; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * put a block into the map | |
1020 | */ | |
1021 | setblock(fs, cp, h) | |
1022 | struct fs *fs; | |
1023 | unsigned char *cp; | |
1024 | int h; | |
1025 | { | |
1026 | switch (fs->fs_frag) { | |
1027 | case 8: | |
1028 | cp[h] = 0xff; | |
1029 | return; | |
1030 | case 4: | |
1031 | cp[h >> 1] |= (0x0f << ((h & 0x1) << 2)); | |
1032 | return; | |
1033 | case 2: | |
1034 | cp[h >> 2] |= (0x03 << ((h & 0x3) << 1)); | |
1035 | return; | |
1036 | case 1: | |
1037 | cp[h >> 3] |= (0x01 << (h & 0x7)); | |
1038 | return; | |
1039 | default: | |
1040 | #ifdef STANDALONE | |
1041 | printf("setblock bad fs_frag %d\n", fs->fs_frag); | |
1042 | #else | |
1043 | fprintf(stderr, "setblock bad fs_frag %d\n", fs->fs_frag); | |
1044 | #endif | |
1045 | return; | |
1046 | } | |
1047 | } |