Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
7188ac27 | 2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. |
202a4bd9 | 3 | * All rights reserved. |
da7c5cc6 | 4 | * |
b702c21d | 5 | * %sccs.include.redist.c% |
202a4bd9 | 6 | * |
5d4e84f3 | 7 | * @(#)ffs_alloc.c 7.38 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
e3fe2d69 | 9 | |
6d3d8a1c KB |
10 | #include <sys/param.h> |
11 | #include <sys/systm.h> | |
12 | #include <sys/buf.h> | |
13 | #include <sys/proc.h> | |
14 | #include <sys/vnode.h> | |
5d4e84f3 | 15 | #include <sys/mount.h> |
6d3d8a1c KB |
16 | #include <sys/kernel.h> |
17 | #include <sys/syslog.h> | |
c6f5111d | 18 | |
80e9de4e KM |
19 | #include <vm/vm.h> |
20 | ||
6d3d8a1c KB |
21 | #include <ufs/ufs/quota.h> |
22 | #include <ufs/ufs/inode.h> | |
e3fe2d69 | 23 | |
6d3d8a1c KB |
24 | #include <ufs/ffs/fs.h> |
25 | #include <ufs/ffs/ffs_extern.h> | |
26 | ||
27 | extern u_long nextgennumber; | |
28 | ||
29 | static daddr_t ffs_alloccg __P((struct inode *, int, daddr_t, int)); | |
30 | static daddr_t ffs_alloccgblk __P((struct fs *, struct cg *, daddr_t)); | |
31 | static ino_t ffs_dirpref __P((struct fs *)); | |
32 | static daddr_t ffs_fragextend __P((struct inode *, int, long, int, int)); | |
33 | static void ffs_fserr __P((struct fs *, u_int, char *)); | |
34 | static u_long ffs_hashalloc | |
35 | __P((struct inode *, int, long, int, u_long (*)())); | |
36 | static ino_t ffs_ialloccg __P((struct inode *, int, daddr_t, int)); | |
37 | static daddr_t ffs_mapsearch __P((struct fs *, struct cg *, daddr_t, int)); | |
e3fe2d69 | 38 | |
502770a3 KM |
39 | /* |
40 | * Allocate a block in the file system. | |
41 | * | |
42 | * The size of the requested block is given, which must be some | |
43 | * multiple of fs_fsize and <= fs_bsize. | |
44 | * A preference may be optionally specified. If a preference is given | |
45 | * the following hierarchy is used to allocate a block: | |
46 | * 1) allocate the requested block. | |
47 | * 2) allocate a rotationally optimal block in the same cylinder. | |
48 | * 3) allocate a block in the same cylinder group. | |
49 | * 4) quadradically rehash into other cylinder groups, until an | |
50 | * available block is located. | |
51 | * If no block preference is given the following heirarchy is used | |
52 | * to allocate a block: | |
53 | * 1) allocate a block in the cylinder group that contains the | |
54 | * inode for the file. | |
55 | * 2) quadradically rehash into other cylinder groups, until an | |
56 | * available block is located. | |
57 | */ | |
9438887a | 58 | ffs_alloc(ip, lbn, bpref, size, cred, bnp) |
f3c028b7 | 59 | register struct inode *ip; |
0c36425b | 60 | daddr_t lbn, bpref; |
e3fe2d69 | 61 | int size; |
9438887a | 62 | struct ucred *cred; |
0c36425b | 63 | daddr_t *bnp; |
e3fe2d69 KM |
64 | { |
65 | daddr_t bno; | |
66 | register struct fs *fs; | |
f3c028b7 | 67 | register struct buf *bp; |
7188ac27 | 68 | int cg, error; |
e3fe2d69 | 69 | |
0c36425b | 70 | *bnp = 0; |
f7287e4b | 71 | fs = ip->i_fs; |
9438887a | 72 | #ifdef DIAGNOSTIC |
ffd90e52 KM |
73 | if ((unsigned)size > fs->fs_bsize || fragoff(fs, size) != 0) { |
74 | printf("dev = 0x%x, bsize = %d, size = %d, fs = %s\n", | |
75 | ip->i_dev, fs->fs_bsize, size, fs->fs_fsmnt); | |
6d3d8a1c | 76 | panic("ffs_alloc: bad size"); |
ffd90e52 | 77 | } |
9438887a KM |
78 | if (cred == NOCRED) |
79 | panic("ffs_alloc: missing credential\n"); | |
80 | #endif /* DIAGNOSTIC */ | |
b6407c9d | 81 | if (size == fs->fs_bsize && fs->fs_cstotal.cs_nbfree == 0) |
0947395d | 82 | goto nospace; |
00bff950 | 83 | if (cred->cr_uid != 0 && freespace(fs, fs->fs_minfree) <= 0) |
e3fe2d69 | 84 | goto nospace; |
b4567e9c | 85 | #ifdef QUOTA |
00bff950 | 86 | if (error = chkdq(ip, (long)btodb(size), cred, 0)) |
7188ac27 | 87 | return (error); |
ca90a6bf | 88 | #endif |
260e5e3c KM |
89 | if (bpref >= fs->fs_size) |
90 | bpref = 0; | |
e3fe2d69 | 91 | if (bpref == 0) |
6994bf5d | 92 | cg = itog(fs, ip->i_number); |
e3fe2d69 | 93 | else |
6994bf5d | 94 | cg = dtog(fs, bpref); |
6d3d8a1c KB |
95 | bno = (daddr_t)ffs_hashalloc(ip, cg, (long)bpref, size, |
96 | (u_long (*)())ffs_alloccg); | |
0c36425b KM |
97 | if (bno > 0) { |
98 | ip->i_blocks += btodb(size); | |
99 | ip->i_flag |= IUPD|ICHG; | |
100 | *bnp = bno; | |
101 | return (0); | |
102 | } | |
8a403f0d KM |
103 | #ifdef QUOTA |
104 | /* | |
105 | * Restore user's disk quota because allocation failed. | |
106 | */ | |
107 | (void) chkdq(ip, (long)-btodb(size), cred, FORCE); | |
108 | #endif | |
e3fe2d69 | 109 | nospace: |
6d3d8a1c | 110 | ffs_fserr(fs, cred->cr_uid, "file system full"); |
e3fe2d69 | 111 | uprintf("\n%s: write failed, file system is full\n", fs->fs_fsmnt); |
7188ac27 | 112 | return (ENOSPC); |
e3fe2d69 KM |
113 | } |
114 | ||
502770a3 KM |
115 | /* |
116 | * Reallocate a fragment to a bigger size | |
117 | * | |
118 | * The number and size of the old block is given, and a preference | |
119 | * and new size is also specified. The allocator attempts to extend | |
120 | * the original block. Failing that, the regular block allocator is | |
121 | * invoked to get an appropriate block. | |
122 | */ | |
9438887a | 123 | ffs_realloccg(ip, lbprev, bpref, osize, nsize, cred, bpp) |
f7287e4b | 124 | register struct inode *ip; |
31cd85c7 | 125 | daddr_t lbprev; |
0c36425b | 126 | daddr_t bpref; |
07670f7d | 127 | int osize, nsize; |
9438887a | 128 | struct ucred *cred; |
7188ac27 | 129 | struct buf **bpp; |
07670f7d | 130 | { |
07670f7d | 131 | register struct fs *fs; |
7188ac27 | 132 | struct buf *bp, *obp; |
8986c97c KM |
133 | int cg, request, error; |
134 | daddr_t bprev, bno; | |
07670f7d | 135 | |
7188ac27 | 136 | *bpp = 0; |
f7287e4b | 137 | fs = ip->i_fs; |
9438887a | 138 | #ifdef DIAGNOSTIC |
d995d89d | 139 | if ((unsigned)osize > fs->fs_bsize || fragoff(fs, osize) != 0 || |
ffd90e52 | 140 | (unsigned)nsize > fs->fs_bsize || fragoff(fs, nsize) != 0) { |
6d3d8a1c KB |
141 | printf( |
142 | "dev = 0x%x, bsize = %d, osize = %d, nsize = %d, fs = %s\n", | |
ffd90e52 | 143 | ip->i_dev, fs->fs_bsize, osize, nsize, fs->fs_fsmnt); |
6d3d8a1c | 144 | panic("ffs_realloccg: bad size"); |
ffd90e52 | 145 | } |
9438887a KM |
146 | if (cred == NOCRED) |
147 | panic("ffs_realloccg: missing credential\n"); | |
148 | #endif /* DIAGNOSTIC */ | |
00bff950 | 149 | if (cred->cr_uid != 0 && freespace(fs, fs->fs_minfree) <= 0) |
0947395d | 150 | goto nospace; |
0c36425b | 151 | if ((bprev = ip->i_db[lbprev]) == 0) { |
ffd90e52 KM |
152 | printf("dev = 0x%x, bsize = %d, bprev = %d, fs = %s\n", |
153 | ip->i_dev, fs->fs_bsize, bprev, fs->fs_fsmnt); | |
6d3d8a1c | 154 | panic("ffs_realloccg: bad bprev"); |
ffd90e52 | 155 | } |
0c36425b KM |
156 | /* |
157 | * Allocate the extra space in the buffer. | |
158 | */ | |
159 | if (error = bread(ITOV(ip), lbprev, osize, NOCRED, &bp)) { | |
160 | brelse(bp); | |
161 | return (error); | |
162 | } | |
8a403f0d KM |
163 | #ifdef QUOTA |
164 | if (error = chkdq(ip, (long)btodb(nsize - osize), cred, 0)) { | |
165 | brelse(bp); | |
166 | return (error); | |
167 | } | |
168 | #endif | |
0c36425b KM |
169 | /* |
170 | * Check for extension in the existing location. | |
171 | */ | |
ae851115 | 172 | cg = dtog(fs, bprev); |
6d3d8a1c | 173 | if (bno = ffs_fragextend(ip, cg, (long)bprev, osize, nsize)) { |
72ef728e | 174 | if (bp->b_blkno != fsbtodb(fs, bno)) |
0c36425b | 175 | panic("bad blockno"); |
2393702a KM |
176 | ip->i_blocks += btodb(nsize - osize); |
177 | ip->i_flag |= IUPD|ICHG; | |
b3f3adbd KM |
178 | allocbuf(bp, nsize); |
179 | bp->b_flags |= B_DONE; | |
180 | bzero(bp->b_un.b_addr + osize, (unsigned)nsize - osize); | |
7188ac27 KM |
181 | *bpp = bp; |
182 | return (0); | |
f3c028b7 | 183 | } |
0c36425b KM |
184 | /* |
185 | * Allocate a new disk location. | |
186 | */ | |
260e5e3c KM |
187 | if (bpref >= fs->fs_size) |
188 | bpref = 0; | |
aec7dd3b | 189 | switch ((int)fs->fs_optim) { |
f8484b5f KM |
190 | case FS_OPTSPACE: |
191 | /* | |
192 | * Allocate an exact sized fragment. Although this makes | |
193 | * best use of space, we will waste time relocating it if | |
194 | * the file continues to grow. If the fragmentation is | |
195 | * less than half of the minimum free reserve, we choose | |
196 | * to begin optimizing for time. | |
197 | */ | |
f7fa0c54 | 198 | request = nsize; |
f8484b5f KM |
199 | if (fs->fs_minfree < 5 || |
200 | fs->fs_cstotal.cs_nffree > | |
201 | fs->fs_dsize * fs->fs_minfree / (2 * 100)) | |
202 | break; | |
203 | log(LOG_NOTICE, "%s: optimization changed from SPACE to TIME\n", | |
204 | fs->fs_fsmnt); | |
205 | fs->fs_optim = FS_OPTTIME; | |
206 | break; | |
207 | case FS_OPTTIME: | |
208 | /* | |
6d3d8a1c KB |
209 | * At this point we have discovered a file that is trying to |
210 | * grow a small fragment to a larger fragment. To save time, | |
211 | * we allocate a full sized block, then free the unused portion. | |
212 | * If the file continues to grow, the `ffs_fragextend' call | |
213 | * above will be able to grow it in place without further | |
214 | * copying. If aberrant programs cause disk fragmentation to | |
215 | * grow within 2% of the free reserve, we choose to begin | |
216 | * optimizing for space. | |
f8484b5f | 217 | */ |
f7fa0c54 | 218 | request = fs->fs_bsize; |
f8484b5f KM |
219 | if (fs->fs_cstotal.cs_nffree < |
220 | fs->fs_dsize * (fs->fs_minfree - 2) / 100) | |
221 | break; | |
222 | log(LOG_NOTICE, "%s: optimization changed from TIME to SPACE\n", | |
223 | fs->fs_fsmnt); | |
224 | fs->fs_optim = FS_OPTSPACE; | |
225 | break; | |
226 | default: | |
227 | printf("dev = 0x%x, optim = %d, fs = %s\n", | |
228 | ip->i_dev, fs->fs_optim, fs->fs_fsmnt); | |
6d3d8a1c | 229 | panic("ffs_realloccg: bad optim"); |
f8484b5f KM |
230 | /* NOTREACHED */ |
231 | } | |
6d3d8a1c KB |
232 | bno = (daddr_t)ffs_hashalloc(ip, cg, (long)bpref, request, |
233 | (u_long (*)())ffs_alloccg); | |
6459ebe0 | 234 | if (bno > 0) { |
ec67a3ce MK |
235 | #ifdef SECSIZE |
236 | obp = bread(ip->i_dev, fsbtodb(fs, bprev), osize, | |
237 | fs->fs_dbsize); | |
238 | #else SECSIZE | |
ec67a3ce MK |
239 | count = howmany(osize, CLBYTES); |
240 | for (i = 0; i < count; i++) | |
241 | #ifdef SECSIZE | |
242 | munhash(ip->i_dev, bn + i * CLBYTES / fs->fs_dbsize); | |
243 | #else SECSIZE | |
244 | munhash(ip->i_dev, bn + i * CLBYTES / DEV_BSIZE); | |
245 | #endif SECSIZE | |
31cd85c7 | 246 | ffs_blkfree(ip, bprev, (long)osize); |
f7fa0c54 | 247 | if (nsize < request) |
6d3d8a1c | 248 | ffs_blkfree(ip, bno + numfrags(fs, nsize), |
31cd85c7 | 249 | (long)(request - nsize)); |
2523b389 SL |
250 | ip->i_blocks += btodb(nsize - osize); |
251 | ip->i_flag |= IUPD|ICHG; | |
b3f3adbd KM |
252 | allocbuf(bp, nsize); |
253 | bp->b_flags |= B_DONE; | |
254 | bzero(bp->b_un.b_addr + osize, (unsigned)nsize - osize); | |
7188ac27 KM |
255 | *bpp = bp; |
256 | return (0); | |
f3c028b7 | 257 | } |
8a403f0d KM |
258 | #ifdef QUOTA |
259 | /* | |
260 | * Restore user's disk quota because allocation failed. | |
261 | */ | |
262 | (void) chkdq(ip, (long)-btodb(nsize - osize), cred, FORCE); | |
263 | #endif | |
0c36425b | 264 | brelse(bp); |
0947395d | 265 | nospace: |
f3c028b7 KM |
266 | /* |
267 | * no space available | |
268 | */ | |
6d3d8a1c | 269 | ffs_fserr(fs, cred->cr_uid, "file system full"); |
07670f7d | 270 | uprintf("\n%s: write failed, file system is full\n", fs->fs_fsmnt); |
7188ac27 | 271 | return (ENOSPC); |
07670f7d KM |
272 | } |
273 | ||
502770a3 KM |
274 | /* |
275 | * Allocate an inode in the file system. | |
276 | * | |
6d3d8a1c KB |
277 | * If allocating a directory, use ffs_dirpref to select the inode. |
278 | * If allocating in a directory, the following hierarchy is followed: | |
279 | * 1) allocate the preferred inode. | |
502770a3 KM |
280 | * 2) allocate an inode in the same cylinder group. |
281 | * 3) quadradically rehash into other cylinder groups, until an | |
282 | * available inode is located. | |
283 | * If no inode preference is given the following heirarchy is used | |
284 | * to allocate an inode: | |
285 | * 1) allocate an inode in cylinder group 0. | |
286 | * 2) quadradically rehash into other cylinder groups, until an | |
287 | * available inode is located. | |
288 | */ | |
5d4e84f3 KM |
289 | ffs_valloc(ap) |
290 | struct vop_valloc_args /* { | |
291 | struct vnode *a_pvp; | |
292 | int a_mode; | |
293 | struct ucred *a_cred; | |
294 | struct vnode **a_vpp; | |
295 | } */ *ap; | |
e3fe2d69 | 296 | { |
406c9a0d | 297 | register struct vnode *pvp = ap->a_pvp; |
a9013e03 | 298 | register struct inode *pip; |
e3fe2d69 KM |
299 | register struct fs *fs; |
300 | register struct inode *ip; | |
5d4e84f3 | 301 | mode_t mode = ap->a_mode; |
6d3d8a1c | 302 | ino_t ino, ipref; |
7188ac27 | 303 | int cg, error; |
e3fe2d69 | 304 | |
e1b76915 | 305 | *ap->a_vpp = NULL; |
406c9a0d | 306 | pip = VTOI(pvp); |
f7287e4b | 307 | fs = pip->i_fs; |
0947395d | 308 | if (fs->fs_cstotal.cs_nifree == 0) |
e3fe2d69 | 309 | goto noinodes; |
6d3d8a1c | 310 | |
5d4e84f3 | 311 | if ((mode & IFMT) == IFDIR) |
a9013e03 | 312 | ipref = ffs_dirpref(fs); |
6d3d8a1c KB |
313 | else |
314 | ipref = pip->i_number; | |
260e5e3c KM |
315 | if (ipref >= fs->fs_ncg * fs->fs_ipg) |
316 | ipref = 0; | |
6994bf5d | 317 | cg = itog(fs, ipref); |
5d4e84f3 | 318 | ino = (ino_t)ffs_hashalloc(pip, cg, (long)ipref, mode, ffs_ialloccg); |
e3fe2d69 KM |
319 | if (ino == 0) |
320 | goto noinodes; | |
5d4e84f3 | 321 | error = VFS_VGET(pvp->v_mount, ino, ap->a_vpp); |
7188ac27 | 322 | if (error) { |
5d4e84f3 | 323 | VOP_VFREE(pvp, ino, mode); |
7188ac27 | 324 | return (error); |
e3fe2d69 | 325 | } |
e1b76915 | 326 | ip = VTOI(*ap->a_vpp); |
ffd90e52 | 327 | if (ip->i_mode) { |
5d4e84f3 | 328 | printf("mode = 0%o, inum = %d, fs = %s\n", |
ffd90e52 | 329 | ip->i_mode, ip->i_number, fs->fs_fsmnt); |
a9013e03 | 330 | panic("ffs_valloc: dup alloc"); |
ffd90e52 | 331 | } |
2523b389 SL |
332 | if (ip->i_blocks) { /* XXX */ |
333 | printf("free inode %s/%d had %d blocks\n", | |
334 | fs->fs_fsmnt, ino, ip->i_blocks); | |
335 | ip->i_blocks = 0; | |
336 | } | |
7e0dee76 | 337 | ip->i_flags = 0; |
fb92d0ab KM |
338 | /* |
339 | * Set up a new generation number for this inode. | |
340 | */ | |
341 | if (++nextgennumber < (u_long)time.tv_sec) | |
342 | nextgennumber = time.tv_sec; | |
343 | ip->i_gen = nextgennumber; | |
7188ac27 | 344 | return (0); |
e3fe2d69 | 345 | noinodes: |
e1b76915 | 346 | ffs_fserr(fs, ap->a_cred->cr_uid, "out of inodes"); |
ae851115 | 347 | uprintf("\n%s: create/symlink failed, no inodes free\n", fs->fs_fsmnt); |
7188ac27 | 348 | return (ENOSPC); |
e3fe2d69 KM |
349 | } |
350 | ||
743f1ef7 | 351 | /* |
502770a3 KM |
352 | * Find a cylinder to place a directory. |
353 | * | |
354 | * The policy implemented by this algorithm is to select from | |
355 | * among those cylinder groups with above the average number of | |
356 | * free inodes, the one with the smallest number of directories. | |
743f1ef7 | 357 | */ |
6d3d8a1c KB |
358 | static ino_t |
359 | ffs_dirpref(fs) | |
e3fe2d69 | 360 | register struct fs *fs; |
f7287e4b | 361 | { |
743f1ef7 | 362 | int cg, minndir, mincg, avgifree; |
e3fe2d69 | 363 | |
0947395d | 364 | avgifree = fs->fs_cstotal.cs_nifree / fs->fs_ncg; |
743f1ef7 | 365 | minndir = fs->fs_ipg; |
e3fe2d69 | 366 | mincg = 0; |
743f1ef7 | 367 | for (cg = 0; cg < fs->fs_ncg; cg++) |
b6407c9d KM |
368 | if (fs->fs_cs(fs, cg).cs_ndir < minndir && |
369 | fs->fs_cs(fs, cg).cs_nifree >= avgifree) { | |
e3fe2d69 | 370 | mincg = cg; |
b6407c9d | 371 | minndir = fs->fs_cs(fs, cg).cs_ndir; |
e3fe2d69 | 372 | } |
4f083fd7 | 373 | return ((ino_t)(fs->fs_ipg * mincg)); |
e3fe2d69 KM |
374 | } |
375 | ||
743f1ef7 | 376 | /* |
4f083fd7 SL |
377 | * Select the desired position for the next block in a file. The file is |
378 | * logically divided into sections. The first section is composed of the | |
379 | * direct blocks. Each additional section contains fs_maxbpg blocks. | |
380 | * | |
381 | * If no blocks have been allocated in the first section, the policy is to | |
382 | * request a block in the same cylinder group as the inode that describes | |
383 | * the file. If no blocks have been allocated in any other section, the | |
384 | * policy is to place the section in a cylinder group with a greater than | |
385 | * average number of free blocks. An appropriate cylinder group is found | |
16e7863f KM |
386 | * by using a rotor that sweeps the cylinder groups. When a new group of |
387 | * blocks is needed, the sweep begins in the cylinder group following the | |
388 | * cylinder group from which the previous allocation was made. The sweep | |
389 | * continues until a cylinder group with greater than the average number | |
390 | * of free blocks is found. If the allocation is for the first block in an | |
391 | * indirect block, the information on the previous allocation is unavailable; | |
392 | * here a best guess is made based upon the logical block number being | |
393 | * allocated. | |
4f083fd7 SL |
394 | * |
395 | * If a section is already partially allocated, the policy is to | |
396 | * contiguously allocate fs_maxcontig blocks. The end of one of these | |
397 | * contiguous blocks and the beginning of the next is physically separated | |
398 | * so that the disk head will be in transit between them for at least | |
399 | * fs_rotdelay milliseconds. This is to allow time for the processor to | |
400 | * schedule another I/O transfer. | |
743f1ef7 | 401 | */ |
daaf7bee | 402 | daddr_t |
6d3d8a1c | 403 | ffs_blkpref(ip, lbn, indx, bap) |
4f083fd7 SL |
404 | struct inode *ip; |
405 | daddr_t lbn; | |
406 | int indx; | |
407 | daddr_t *bap; | |
f7287e4b | 408 | { |
4f083fd7 | 409 | register struct fs *fs; |
16e7863f KM |
410 | register int cg; |
411 | int avgbfree, startcg; | |
4f083fd7 | 412 | daddr_t nextblk; |
743f1ef7 | 413 | |
4f083fd7 SL |
414 | fs = ip->i_fs; |
415 | if (indx % fs->fs_maxbpg == 0 || bap[indx - 1] == 0) { | |
416 | if (lbn < NDADDR) { | |
417 | cg = itog(fs, ip->i_number); | |
b6407c9d | 418 | return (fs->fs_fpg * cg + fs->fs_frag); |
743f1ef7 | 419 | } |
4f083fd7 SL |
420 | /* |
421 | * Find a cylinder with greater than average number of | |
422 | * unused data blocks. | |
423 | */ | |
16e7863f KM |
424 | if (indx == 0 || bap[indx - 1] == 0) |
425 | startcg = itog(fs, ip->i_number) + lbn / fs->fs_maxbpg; | |
426 | else | |
427 | startcg = dtog(fs, bap[indx - 1]) + 1; | |
428 | startcg %= fs->fs_ncg; | |
4f083fd7 | 429 | avgbfree = fs->fs_cstotal.cs_nbfree / fs->fs_ncg; |
16e7863f | 430 | for (cg = startcg; cg < fs->fs_ncg; cg++) |
4f083fd7 SL |
431 | if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) { |
432 | fs->fs_cgrotor = cg; | |
433 | return (fs->fs_fpg * cg + fs->fs_frag); | |
434 | } | |
16e7863f | 435 | for (cg = 0; cg <= startcg; cg++) |
4f083fd7 SL |
436 | if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) { |
437 | fs->fs_cgrotor = cg; | |
438 | return (fs->fs_fpg * cg + fs->fs_frag); | |
439 | } | |
440 | return (NULL); | |
441 | } | |
442 | /* | |
443 | * One or more previous blocks have been laid out. If less | |
444 | * than fs_maxcontig previous blocks are contiguous, the | |
445 | * next block is requested contiguously, otherwise it is | |
446 | * requested rotationally delayed by fs_rotdelay milliseconds. | |
447 | */ | |
448 | nextblk = bap[indx - 1] + fs->fs_frag; | |
449 | if (indx > fs->fs_maxcontig && | |
240a4664 | 450 | bap[indx - fs->fs_maxcontig] + blkstofrags(fs, fs->fs_maxcontig) |
4f083fd7 SL |
451 | != nextblk) |
452 | return (nextblk); | |
453 | if (fs->fs_rotdelay != 0) | |
454 | /* | |
455 | * Here we convert ms of delay to frags as: | |
456 | * (frags) = (ms) * (rev/sec) * (sect/rev) / | |
457 | * ((sect/frag) * (ms/sec)) | |
458 | * then round up to the next block. | |
459 | */ | |
460 | nextblk += roundup(fs->fs_rotdelay * fs->fs_rps * fs->fs_nsect / | |
461 | (NSPF(fs) * 1000), fs->fs_frag); | |
462 | return (nextblk); | |
743f1ef7 KM |
463 | } |
464 | ||
502770a3 KM |
465 | /* |
466 | * Implement the cylinder overflow algorithm. | |
467 | * | |
468 | * The policy implemented by this algorithm is: | |
469 | * 1) allocate the block in its requested cylinder group. | |
470 | * 2) quadradically rehash on the cylinder group number. | |
471 | * 3) brute force search for a free block. | |
472 | */ | |
daaf7bee | 473 | /*VARARGS5*/ |
6d3d8a1c KB |
474 | static u_long |
475 | ffs_hashalloc(ip, cg, pref, size, allocator) | |
f7287e4b | 476 | struct inode *ip; |
e3fe2d69 KM |
477 | int cg; |
478 | long pref; | |
479 | int size; /* size for data blocks, mode for inodes */ | |
daaf7bee | 480 | u_long (*allocator)(); |
e3fe2d69 | 481 | { |
f7287e4b | 482 | register struct fs *fs; |
e3fe2d69 KM |
483 | long result; |
484 | int i, icg = cg; | |
485 | ||
f7287e4b | 486 | fs = ip->i_fs; |
e3fe2d69 KM |
487 | /* |
488 | * 1: preferred cylinder group | |
489 | */ | |
f7287e4b | 490 | result = (*allocator)(ip, cg, pref, size); |
e3fe2d69 KM |
491 | if (result) |
492 | return (result); | |
493 | /* | |
494 | * 2: quadratic rehash | |
495 | */ | |
496 | for (i = 1; i < fs->fs_ncg; i *= 2) { | |
497 | cg += i; | |
498 | if (cg >= fs->fs_ncg) | |
499 | cg -= fs->fs_ncg; | |
f7287e4b | 500 | result = (*allocator)(ip, cg, 0, size); |
e3fe2d69 KM |
501 | if (result) |
502 | return (result); | |
503 | } | |
504 | /* | |
505 | * 3: brute force search | |
620b3290 SL |
506 | * Note that we start at i == 2, since 0 was checked initially, |
507 | * and 1 is always checked in the quadratic rehash. | |
e3fe2d69 | 508 | */ |
2136305e | 509 | cg = (icg + 2) % fs->fs_ncg; |
620b3290 | 510 | for (i = 2; i < fs->fs_ncg; i++) { |
f7287e4b | 511 | result = (*allocator)(ip, cg, 0, size); |
e3fe2d69 KM |
512 | if (result) |
513 | return (result); | |
514 | cg++; | |
515 | if (cg == fs->fs_ncg) | |
516 | cg = 0; | |
517 | } | |
ae851115 | 518 | return (NULL); |
e3fe2d69 KM |
519 | } |
520 | ||
502770a3 KM |
521 | /* |
522 | * Determine whether a fragment can be extended. | |
523 | * | |
524 | * Check to see if the necessary fragments are available, and | |
525 | * if they are, allocate them. | |
526 | */ | |
6d3d8a1c KB |
527 | static daddr_t |
528 | ffs_fragextend(ip, cg, bprev, osize, nsize) | |
f7287e4b | 529 | struct inode *ip; |
07670f7d | 530 | int cg; |
f3c028b7 | 531 | long bprev; |
07670f7d KM |
532 | int osize, nsize; |
533 | { | |
f7287e4b | 534 | register struct fs *fs; |
f3c028b7 | 535 | register struct cg *cgp; |
7188ac27 | 536 | struct buf *bp; |
f3c028b7 KM |
537 | long bno; |
538 | int frags, bbase; | |
7188ac27 | 539 | int i, error; |
07670f7d | 540 | |
f7287e4b | 541 | fs = ip->i_fs; |
a8580723 | 542 | if (fs->fs_cs(fs, cg).cs_nffree < numfrags(fs, nsize - osize)) |
e5476900 | 543 | return (NULL); |
d995d89d | 544 | frags = numfrags(fs, nsize); |
a8580723 KM |
545 | bbase = fragnum(fs, bprev); |
546 | if (bbase > fragnum(fs, (bprev + frags - 1))) { | |
ec67a3ce | 547 | /* cannot extend across a block boundary */ |
ae851115 | 548 | return (NULL); |
f3c028b7 | 549 | } |
ec67a3ce MK |
550 | #ifdef SECSIZE |
551 | bp = bread(ip->i_dev, fsbtodb(fs, cgtod(fs, cg)), (int)fs->fs_cgsize, | |
552 | fs->fs_dbsize); | |
553 | #else SECSIZE | |
7188ac27 | 554 | error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)), |
a937f856 | 555 | (int)fs->fs_cgsize, NOCRED, &bp); |
7188ac27 KM |
556 | if (error) { |
557 | brelse(bp); | |
558 | return (NULL); | |
559 | } | |
ec67a3ce | 560 | #endif SECSIZE |
e5476900 | 561 | cgp = bp->b_un.b_cg; |
7188ac27 | 562 | if (!cg_chkmagic(cgp)) { |
d995d89d | 563 | brelse(bp); |
ae851115 | 564 | return (NULL); |
d995d89d | 565 | } |
95d0807c | 566 | cgp->cg_time = time.tv_sec; |
6994bf5d | 567 | bno = dtogd(fs, bprev); |
d995d89d | 568 | for (i = numfrags(fs, osize); i < frags; i++) |
10adeb11 | 569 | if (isclr(cg_blksfree(cgp), bno + i)) { |
aca50d72 | 570 | brelse(bp); |
ae851115 | 571 | return (NULL); |
aca50d72 KM |
572 | } |
573 | /* | |
574 | * the current fragment can be extended | |
575 | * deduct the count on fragment being extended into | |
576 | * increase the count on the remaining fragment (if any) | |
577 | * allocate the extended piece | |
578 | */ | |
579 | for (i = frags; i < fs->fs_frag - bbase; i++) | |
10adeb11 | 580 | if (isclr(cg_blksfree(cgp), bno + i)) |
f3c028b7 | 581 | break; |
d995d89d | 582 | cgp->cg_frsum[i - numfrags(fs, osize)]--; |
aca50d72 KM |
583 | if (i != frags) |
584 | cgp->cg_frsum[i - frags]++; | |
d995d89d | 585 | for (i = numfrags(fs, osize); i < frags; i++) { |
10adeb11 | 586 | clrbit(cg_blksfree(cgp), bno + i); |
aca50d72 KM |
587 | cgp->cg_cs.cs_nffree--; |
588 | fs->fs_cstotal.cs_nffree--; | |
589 | fs->fs_cs(fs, cg).cs_nffree--; | |
f3c028b7 | 590 | } |
e809642a | 591 | fs->fs_fmod = 1; |
aca50d72 KM |
592 | bdwrite(bp); |
593 | return (bprev); | |
07670f7d KM |
594 | } |
595 | ||
502770a3 KM |
596 | /* |
597 | * Determine whether a block can be allocated. | |
598 | * | |
599 | * Check to see if a block of the apprpriate size is available, | |
600 | * and if it is, allocate it. | |
601 | */ | |
cd434177 | 602 | static daddr_t |
6d3d8a1c | 603 | ffs_alloccg(ip, cg, bpref, size) |
f7287e4b | 604 | struct inode *ip; |
e3fe2d69 KM |
605 | int cg; |
606 | daddr_t bpref; | |
607 | int size; | |
608 | { | |
f7287e4b | 609 | register struct fs *fs; |
f3c028b7 | 610 | register struct cg *cgp; |
7188ac27 | 611 | struct buf *bp; |
f3c028b7 | 612 | register int i; |
7188ac27 | 613 | int error, bno, frags, allocsiz; |
e3fe2d69 | 614 | |
f7287e4b | 615 | fs = ip->i_fs; |
b6407c9d | 616 | if (fs->fs_cs(fs, cg).cs_nbfree == 0 && size == fs->fs_bsize) |
ae851115 | 617 | return (NULL); |
ec67a3ce MK |
618 | #ifdef SECSIZE |
619 | bp = bread(ip->i_dev, fsbtodb(fs, cgtod(fs, cg)), (int)fs->fs_cgsize, | |
620 | fs->fs_dbsize); | |
621 | #else SECSIZE | |
7188ac27 | 622 | error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)), |
a937f856 | 623 | (int)fs->fs_cgsize, NOCRED, &bp); |
7188ac27 KM |
624 | if (error) { |
625 | brelse(bp); | |
626 | return (NULL); | |
627 | } | |
ec67a3ce | 628 | #endif SECSIZE |
e5476900 | 629 | cgp = bp->b_un.b_cg; |
7188ac27 | 630 | if (!cg_chkmagic(cgp) || |
0f538882 | 631 | (cgp->cg_cs.cs_nbfree == 0 && size == fs->fs_bsize)) { |
d995d89d | 632 | brelse(bp); |
ae851115 | 633 | return (NULL); |
d995d89d | 634 | } |
95d0807c | 635 | cgp->cg_time = time.tv_sec; |
b6407c9d | 636 | if (size == fs->fs_bsize) { |
6d3d8a1c | 637 | bno = ffs_alloccgblk(fs, cgp, bpref); |
f3c028b7 KM |
638 | bdwrite(bp); |
639 | return (bno); | |
640 | } | |
641 | /* | |
642 | * check to see if any fragments are already available | |
643 | * allocsiz is the size which will be allocated, hacking | |
644 | * it down to a smaller size if necessary | |
645 | */ | |
d995d89d | 646 | frags = numfrags(fs, size); |
b6407c9d | 647 | for (allocsiz = frags; allocsiz < fs->fs_frag; allocsiz++) |
f3c028b7 KM |
648 | if (cgp->cg_frsum[allocsiz] != 0) |
649 | break; | |
b6407c9d | 650 | if (allocsiz == fs->fs_frag) { |
f3c028b7 KM |
651 | /* |
652 | * no fragments were available, so a block will be | |
653 | * allocated, and hacked up | |
654 | */ | |
0947395d | 655 | if (cgp->cg_cs.cs_nbfree == 0) { |
f3c028b7 | 656 | brelse(bp); |
ae851115 | 657 | return (NULL); |
f3c028b7 | 658 | } |
6d3d8a1c | 659 | bno = ffs_alloccgblk(fs, cgp, bpref); |
6994bf5d | 660 | bpref = dtogd(fs, bno); |
b6407c9d | 661 | for (i = frags; i < fs->fs_frag; i++) |
10adeb11 | 662 | setbit(cg_blksfree(cgp), bpref + i); |
b6407c9d | 663 | i = fs->fs_frag - frags; |
0947395d KM |
664 | cgp->cg_cs.cs_nffree += i; |
665 | fs->fs_cstotal.cs_nffree += i; | |
b6407c9d | 666 | fs->fs_cs(fs, cg).cs_nffree += i; |
e809642a | 667 | fs->fs_fmod = 1; |
f3c028b7 KM |
668 | cgp->cg_frsum[i]++; |
669 | bdwrite(bp); | |
670 | return (bno); | |
671 | } | |
6d3d8a1c | 672 | bno = ffs_mapsearch(fs, cgp, bpref, allocsiz); |
0f538882 KM |
673 | if (bno < 0) { |
674 | brelse(bp); | |
ae851115 | 675 | return (NULL); |
0f538882 | 676 | } |
f3c028b7 | 677 | for (i = 0; i < frags; i++) |
10adeb11 | 678 | clrbit(cg_blksfree(cgp), bno + i); |
0947395d KM |
679 | cgp->cg_cs.cs_nffree -= frags; |
680 | fs->fs_cstotal.cs_nffree -= frags; | |
b6407c9d | 681 | fs->fs_cs(fs, cg).cs_nffree -= frags; |
e809642a | 682 | fs->fs_fmod = 1; |
f3c028b7 KM |
683 | cgp->cg_frsum[allocsiz]--; |
684 | if (frags != allocsiz) | |
685 | cgp->cg_frsum[allocsiz - frags]++; | |
686 | bdwrite(bp); | |
687 | return (cg * fs->fs_fpg + bno); | |
688 | } | |
689 | ||
502770a3 KM |
690 | /* |
691 | * Allocate a block in a cylinder group. | |
692 | * | |
693 | * This algorithm implements the following policy: | |
694 | * 1) allocate the requested block. | |
695 | * 2) allocate a rotationally optimal block in the same cylinder. | |
696 | * 3) allocate the next available block on the block rotor for the | |
697 | * specified cylinder group. | |
698 | * Note that this routine only allocates fs_bsize blocks; these | |
699 | * blocks may be fragmented by the routine that allocates them. | |
700 | */ | |
6d3d8a1c KB |
701 | static daddr_t |
702 | ffs_alloccgblk(fs, cgp, bpref) | |
f7287e4b | 703 | register struct fs *fs; |
f3c028b7 KM |
704 | register struct cg *cgp; |
705 | daddr_t bpref; | |
706 | { | |
743f1ef7 | 707 | daddr_t bno; |
ae851115 | 708 | int cylno, pos, delta; |
743f1ef7 | 709 | short *cylbp; |
aca50d72 | 710 | register int i; |
f3c028b7 | 711 | |
743f1ef7 KM |
712 | if (bpref == 0) { |
713 | bpref = cgp->cg_rotor; | |
aca50d72 KM |
714 | goto norot; |
715 | } | |
a8580723 | 716 | bpref = blknum(fs, bpref); |
6994bf5d | 717 | bpref = dtogd(fs, bpref); |
aca50d72 KM |
718 | /* |
719 | * if the requested block is available, use it | |
720 | */ | |
6d3d8a1c | 721 | if (ffs_isblock(fs, cg_blksfree(cgp), fragstoblks(fs, bpref))) { |
aca50d72 KM |
722 | bno = bpref; |
723 | goto gotit; | |
724 | } | |
aca50d72 KM |
725 | /* |
726 | * check for a block available on the same cylinder | |
aca50d72 KM |
727 | */ |
728 | cylno = cbtocylno(fs, bpref); | |
10adeb11 | 729 | if (cg_blktot(cgp)[cylno] == 0) |
502770a3 KM |
730 | goto norot; |
731 | if (fs->fs_cpc == 0) { | |
732 | /* | |
733 | * block layout info is not available, so just have | |
734 | * to take any block in this cylinder. | |
735 | */ | |
736 | bpref = howmany(fs->fs_spc * cylno, NSPF(fs)); | |
737 | goto norot; | |
738 | } | |
aca50d72 KM |
739 | /* |
740 | * check the summary information to see if a block is | |
741 | * available in the requested cylinder starting at the | |
4f083fd7 | 742 | * requested rotational position and proceeding around. |
aca50d72 | 743 | */ |
10adeb11 | 744 | cylbp = cg_blks(fs, cgp, cylno); |
4f083fd7 | 745 | pos = cbtorpos(fs, bpref); |
10adeb11 | 746 | for (i = pos; i < fs->fs_nrpos; i++) |
aca50d72 KM |
747 | if (cylbp[i] > 0) |
748 | break; | |
10adeb11 | 749 | if (i == fs->fs_nrpos) |
aca50d72 | 750 | for (i = 0; i < pos; i++) |
743f1ef7 KM |
751 | if (cylbp[i] > 0) |
752 | break; | |
aca50d72 KM |
753 | if (cylbp[i] > 0) { |
754 | /* | |
755 | * found a rotational position, now find the actual | |
756 | * block. A panic if none is actually there. | |
757 | */ | |
758 | pos = cylno % fs->fs_cpc; | |
759 | bno = (cylno - pos) * fs->fs_spc / NSPB(fs); | |
10adeb11 | 760 | if (fs_postbl(fs, pos)[i] == -1) { |
ffd90e52 KM |
761 | printf("pos = %d, i = %d, fs = %s\n", |
762 | pos, i, fs->fs_fsmnt); | |
6d3d8a1c | 763 | panic("ffs_alloccgblk: cyl groups corrupted"); |
ffd90e52 | 764 | } |
10adeb11 | 765 | for (i = fs_postbl(fs, pos)[i];; ) { |
6d3d8a1c | 766 | if (ffs_isblock(fs, cg_blksfree(cgp), bno + i)) { |
240a4664 | 767 | bno = blkstofrags(fs, (bno + i)); |
aca50d72 | 768 | goto gotit; |
743f1ef7 | 769 | } |
10adeb11 KM |
770 | delta = fs_rotbl(fs)[i]; |
771 | if (delta <= 0 || | |
772 | delta + i > fragstoblks(fs, fs->fs_fpg)) | |
aca50d72 | 773 | break; |
ae851115 | 774 | i += delta; |
743f1ef7 | 775 | } |
ffd90e52 | 776 | printf("pos = %d, i = %d, fs = %s\n", pos, i, fs->fs_fsmnt); |
6d3d8a1c | 777 | panic("ffs_alloccgblk: can't find blk in cyl"); |
e3fe2d69 | 778 | } |
aca50d72 KM |
779 | norot: |
780 | /* | |
781 | * no blocks in the requested cylinder, so take next | |
782 | * available one in this cylinder group. | |
783 | */ | |
6d3d8a1c | 784 | bno = ffs_mapsearch(fs, cgp, bpref, (int)fs->fs_frag); |
6459ebe0 | 785 | if (bno < 0) |
ae851115 | 786 | return (NULL); |
743f1ef7 | 787 | cgp->cg_rotor = bno; |
e3fe2d69 | 788 | gotit: |
6d3d8a1c | 789 | ffs_clrblock(fs, cg_blksfree(cgp), (long)fragstoblks(fs, bno)); |
0947395d KM |
790 | cgp->cg_cs.cs_nbfree--; |
791 | fs->fs_cstotal.cs_nbfree--; | |
b6407c9d | 792 | fs->fs_cs(fs, cgp->cg_cgx).cs_nbfree--; |
502770a3 | 793 | cylno = cbtocylno(fs, bno); |
10adeb11 KM |
794 | cg_blks(fs, cgp, cylno)[cbtorpos(fs, bno)]--; |
795 | cg_blktot(cgp)[cylno]--; | |
e809642a | 796 | fs->fs_fmod = 1; |
743f1ef7 | 797 | return (cgp->cg_cgx * fs->fs_fpg + bno); |
e3fe2d69 | 798 | } |
10adeb11 | 799 | |
502770a3 KM |
800 | /* |
801 | * Determine whether an inode can be allocated. | |
802 | * | |
803 | * Check to see if an inode is available, and if it is, | |
804 | * allocate it using the following policy: | |
805 | * 1) allocate the requested inode. | |
806 | * 2) allocate the next available inode after the requested | |
807 | * inode in the specified cylinder group. | |
808 | */ | |
6d3d8a1c KB |
809 | static ino_t |
810 | ffs_ialloccg(ip, cg, ipref, mode) | |
f7287e4b | 811 | struct inode *ip; |
e3fe2d69 KM |
812 | int cg; |
813 | daddr_t ipref; | |
814 | int mode; | |
815 | { | |
f7287e4b | 816 | register struct fs *fs; |
f3c028b7 | 817 | register struct cg *cgp; |
4e0c7b8a | 818 | struct buf *bp; |
7188ac27 | 819 | int error, start, len, loc, map, i; |
e3fe2d69 | 820 | |
f7287e4b | 821 | fs = ip->i_fs; |
b6407c9d | 822 | if (fs->fs_cs(fs, cg).cs_nifree == 0) |
ae851115 | 823 | return (NULL); |
ec67a3ce MK |
824 | #ifdef SECSIZE |
825 | bp = bread(ip->i_dev, fsbtodb(fs, cgtod(fs, cg)), (int)fs->fs_cgsize, | |
826 | fs->fs_dbsize); | |
827 | #else SECSIZE | |
7188ac27 | 828 | error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)), |
a937f856 | 829 | (int)fs->fs_cgsize, NOCRED, &bp); |
7188ac27 KM |
830 | if (error) { |
831 | brelse(bp); | |
832 | return (NULL); | |
833 | } | |
ec67a3ce | 834 | #endif SECSIZE |
e5476900 | 835 | cgp = bp->b_un.b_cg; |
7188ac27 | 836 | if (!cg_chkmagic(cgp) || cgp->cg_cs.cs_nifree == 0) { |
d995d89d | 837 | brelse(bp); |
ae851115 | 838 | return (NULL); |
d995d89d | 839 | } |
95d0807c | 840 | cgp->cg_time = time.tv_sec; |
e3fe2d69 KM |
841 | if (ipref) { |
842 | ipref %= fs->fs_ipg; | |
10adeb11 | 843 | if (isclr(cg_inosused(cgp), ipref)) |
e3fe2d69 | 844 | goto gotit; |
4e0c7b8a KM |
845 | } |
846 | start = cgp->cg_irotor / NBBY; | |
847 | len = howmany(fs->fs_ipg - cgp->cg_irotor, NBBY); | |
10adeb11 | 848 | loc = skpc(0xff, len, &cg_inosused(cgp)[start]); |
4e0c7b8a | 849 | if (loc == 0) { |
e5889092 KM |
850 | len = start + 1; |
851 | start = 0; | |
10adeb11 | 852 | loc = skpc(0xff, len, &cg_inosused(cgp)[0]); |
e5889092 KM |
853 | if (loc == 0) { |
854 | printf("cg = %s, irotor = %d, fs = %s\n", | |
855 | cg, cgp->cg_irotor, fs->fs_fsmnt); | |
6d3d8a1c | 856 | panic("ffs_ialloccg: map corrupted"); |
e5889092 KM |
857 | /* NOTREACHED */ |
858 | } | |
4e0c7b8a KM |
859 | } |
860 | i = start + len - loc; | |
10adeb11 | 861 | map = cg_inosused(cgp)[i]; |
4e0c7b8a KM |
862 | ipref = i * NBBY; |
863 | for (i = 1; i < (1 << NBBY); i <<= 1, ipref++) { | |
864 | if ((map & i) == 0) { | |
e3fe2d69 KM |
865 | cgp->cg_irotor = ipref; |
866 | goto gotit; | |
867 | } | |
868 | } | |
4e0c7b8a | 869 | printf("fs = %s\n", fs->fs_fsmnt); |
6d3d8a1c | 870 | panic("ffs_ialloccg: block not in map"); |
4e0c7b8a | 871 | /* NOTREACHED */ |
e3fe2d69 | 872 | gotit: |
10adeb11 | 873 | setbit(cg_inosused(cgp), ipref); |
0947395d KM |
874 | cgp->cg_cs.cs_nifree--; |
875 | fs->fs_cstotal.cs_nifree--; | |
b6407c9d | 876 | fs->fs_cs(fs, cg).cs_nifree--; |
e809642a | 877 | fs->fs_fmod = 1; |
e3fe2d69 | 878 | if ((mode & IFMT) == IFDIR) { |
0947395d KM |
879 | cgp->cg_cs.cs_ndir++; |
880 | fs->fs_cstotal.cs_ndir++; | |
b6407c9d | 881 | fs->fs_cs(fs, cg).cs_ndir++; |
e3fe2d69 KM |
882 | } |
883 | bdwrite(bp); | |
884 | return (cg * fs->fs_ipg + ipref); | |
885 | } | |
886 | ||
502770a3 KM |
887 | /* |
888 | * Free a block or fragment. | |
889 | * | |
890 | * The specified block or fragment is placed back in the | |
891 | * free map. If a fragment is deallocated, a possible | |
892 | * block reassembly is checked. | |
893 | */ | |
6d3d8a1c | 894 | ffs_blkfree(ip, bno, size) |
f7287e4b | 895 | register struct inode *ip; |
e3fe2d69 | 896 | daddr_t bno; |
31cd85c7 | 897 | long size; |
e3fe2d69 KM |
898 | { |
899 | register struct fs *fs; | |
900 | register struct cg *cgp; | |
7188ac27 KM |
901 | struct buf *bp; |
902 | int error, cg, blk, frags, bbase; | |
f3c028b7 | 903 | register int i; |
e3fe2d69 | 904 | |
f7287e4b | 905 | fs = ip->i_fs; |
ffd90e52 KM |
906 | if ((unsigned)size > fs->fs_bsize || fragoff(fs, size) != 0) { |
907 | printf("dev = 0x%x, bsize = %d, size = %d, fs = %s\n", | |
908 | ip->i_dev, fs->fs_bsize, size, fs->fs_fsmnt); | |
ced3a252 | 909 | panic("blkfree: bad size"); |
ffd90e52 | 910 | } |
6994bf5d | 911 | cg = dtog(fs, bno); |
e2546752 | 912 | if ((unsigned)bno >= fs->fs_size) { |
6459ebe0 | 913 | printf("bad block %d, ino %d\n", bno, ip->i_number); |
9438887a | 914 | ffs_fserr(fs, ip->i_uid, "bad block"); |
e3fe2d69 | 915 | return; |
6459ebe0 | 916 | } |
ec67a3ce MK |
917 | #ifdef SECSIZE |
918 | bp = bread(ip->i_dev, fsbtodb(fs, cgtod(fs, cg)), (int)fs->fs_cgsize, | |
919 | fs->fs_dbsize); | |
920 | #else SECSIZE | |
7188ac27 | 921 | error = bread(ip->i_devvp, fsbtodb(fs, cgtod(fs, cg)), |
a937f856 | 922 | (int)fs->fs_cgsize, NOCRED, &bp); |
7188ac27 KM |
923 | if (error) { |
924 | brelse(bp); | |
925 | return; | |
926 | } | |
ec67a3ce | 927 | #endif SECSIZE |
e5476900 | 928 | cgp = bp->b_un.b_cg; |
7188ac27 | 929 | if (!cg_chkmagic(cgp)) { |
d995d89d | 930 | brelse(bp); |
e3fe2d69 | 931 | return; |
d995d89d | 932 | } |
95d0807c | 933 | cgp->cg_time = time.tv_sec; |
6994bf5d | 934 | bno = dtogd(fs, bno); |
b6407c9d | 935 | if (size == fs->fs_bsize) { |
6d3d8a1c | 936 | if (ffs_isblock(fs, cg_blksfree(cgp), fragstoblks(fs, bno))) { |
ffd90e52 KM |
937 | printf("dev = 0x%x, block = %d, fs = %s\n", |
938 | ip->i_dev, bno, fs->fs_fsmnt); | |
ced3a252 | 939 | panic("blkfree: freeing free block"); |
6459ebe0 | 940 | } |
6d3d8a1c | 941 | ffs_setblock(fs, cg_blksfree(cgp), fragstoblks(fs, bno)); |
0947395d KM |
942 | cgp->cg_cs.cs_nbfree++; |
943 | fs->fs_cstotal.cs_nbfree++; | |
b6407c9d | 944 | fs->fs_cs(fs, cg).cs_nbfree++; |
502770a3 | 945 | i = cbtocylno(fs, bno); |
10adeb11 KM |
946 | cg_blks(fs, cgp, i)[cbtorpos(fs, bno)]++; |
947 | cg_blktot(cgp)[i]++; | |
07670f7d | 948 | } else { |
a8580723 | 949 | bbase = bno - fragnum(fs, bno); |
f3c028b7 KM |
950 | /* |
951 | * decrement the counts associated with the old frags | |
952 | */ | |
10adeb11 | 953 | blk = blkmap(fs, cg_blksfree(cgp), bbase); |
6d3d8a1c | 954 | ffs_fragacct(fs, blk, cgp->cg_frsum, -1); |
f3c028b7 KM |
955 | /* |
956 | * deallocate the fragment | |
957 | */ | |
d995d89d | 958 | frags = numfrags(fs, size); |
f3c028b7 | 959 | for (i = 0; i < frags; i++) { |
10adeb11 | 960 | if (isset(cg_blksfree(cgp), bno + i)) { |
ffd90e52 KM |
961 | printf("dev = 0x%x, block = %d, fs = %s\n", |
962 | ip->i_dev, bno + i, fs->fs_fsmnt); | |
ced3a252 | 963 | panic("blkfree: freeing free frag"); |
ffd90e52 | 964 | } |
10adeb11 | 965 | setbit(cg_blksfree(cgp), bno + i); |
07670f7d | 966 | } |
ae851115 KM |
967 | cgp->cg_cs.cs_nffree += i; |
968 | fs->fs_cstotal.cs_nffree += i; | |
969 | fs->fs_cs(fs, cg).cs_nffree += i; | |
f3c028b7 KM |
970 | /* |
971 | * add back in counts associated with the new frags | |
972 | */ | |
10adeb11 | 973 | blk = blkmap(fs, cg_blksfree(cgp), bbase); |
6d3d8a1c | 974 | ffs_fragacct(fs, blk, cgp->cg_frsum, 1); |
f3c028b7 KM |
975 | /* |
976 | * if a complete block has been reassembled, account for it | |
977 | */ | |
6d3d8a1c | 978 | if (ffs_isblock(fs, cg_blksfree(cgp), |
9523729e | 979 | (daddr_t)fragstoblks(fs, bbase))) { |
b6407c9d KM |
980 | cgp->cg_cs.cs_nffree -= fs->fs_frag; |
981 | fs->fs_cstotal.cs_nffree -= fs->fs_frag; | |
982 | fs->fs_cs(fs, cg).cs_nffree -= fs->fs_frag; | |
0947395d KM |
983 | cgp->cg_cs.cs_nbfree++; |
984 | fs->fs_cstotal.cs_nbfree++; | |
b6407c9d | 985 | fs->fs_cs(fs, cg).cs_nbfree++; |
502770a3 | 986 | i = cbtocylno(fs, bbase); |
10adeb11 KM |
987 | cg_blks(fs, cgp, i)[cbtorpos(fs, bbase)]++; |
988 | cg_blktot(cgp)[i]++; | |
07670f7d KM |
989 | } |
990 | } | |
e809642a | 991 | fs->fs_fmod = 1; |
e3fe2d69 KM |
992 | bdwrite(bp); |
993 | } | |
994 | ||
502770a3 KM |
995 | /* |
996 | * Free an inode. | |
997 | * | |
998 | * The specified inode is placed back in the free map. | |
999 | */ | |
4e2f97fb | 1000 | int |
5d4e84f3 KM |
1001 | ffs_vfree(ap) |
1002 | struct vop_vfree_args /* { | |
1003 | struct vnode *a_pvp; | |
1004 | ino_t a_ino; | |
1005 | int a_mode; | |
1006 | } */ *ap; | |
e3fe2d69 KM |
1007 | { |
1008 | register struct fs *fs; | |
1009 | register struct cg *cgp; | |
a9013e03 | 1010 | register struct inode *pip; |
5d4e84f3 | 1011 | ino_t ino = ap->a_ino; |
7188ac27 KM |
1012 | struct buf *bp; |
1013 | int error, cg; | |
e3fe2d69 | 1014 | |
e1b76915 | 1015 | pip = VTOI(ap->a_pvp); |
6d3d8a1c | 1016 | fs = pip->i_fs; |
5d4e84f3 KM |
1017 | if ((u_int)ino >= fs->fs_ipg * fs->fs_ncg) |
1018 | panic("ifree: range: dev = 0x%x, ino = %d, fs = %s\n", | |
1019 | pip->i_dev, ino, fs->fs_fsmnt); | |
1020 | cg = itog(fs, ino); | |
ec67a3ce MK |
1021 | #ifdef SECSIZE |
1022 | bp = bread(ip->i_dev, fsbtodb(fs, cgtod(fs, cg)), (int)fs->fs_cgsize, | |
1023 | fs->fs_dbsize); | |
1024 | #else SECSIZE | |
6d3d8a1c | 1025 | error = bread(pip->i_devvp, fsbtodb(fs, cgtod(fs, cg)), |
a937f856 | 1026 | (int)fs->fs_cgsize, NOCRED, &bp); |
7188ac27 KM |
1027 | if (error) { |
1028 | brelse(bp); | |
4e2f97fb | 1029 | return (0); |
7188ac27 | 1030 | } |
ec67a3ce | 1031 | #endif SECSIZE |
e5476900 | 1032 | cgp = bp->b_un.b_cg; |
7188ac27 | 1033 | if (!cg_chkmagic(cgp)) { |
d995d89d | 1034 | brelse(bp); |
4e2f97fb | 1035 | return (0); |
d995d89d | 1036 | } |
95d0807c | 1037 | cgp->cg_time = time.tv_sec; |
5d4e84f3 KM |
1038 | ino %= fs->fs_ipg; |
1039 | if (isclr(cg_inosused(cgp), ino)) { | |
1040 | printf("dev = 0x%x, ino = %d, fs = %s\n", | |
1041 | pip->i_dev, ino, fs->fs_fsmnt); | |
b9ccf514 KM |
1042 | if (fs->fs_ronly == 0) |
1043 | panic("ifree: freeing free inode"); | |
ffd90e52 | 1044 | } |
5d4e84f3 KM |
1045 | clrbit(cg_inosused(cgp), ino); |
1046 | if (ino < cgp->cg_irotor) | |
1047 | cgp->cg_irotor = ino; | |
0947395d KM |
1048 | cgp->cg_cs.cs_nifree++; |
1049 | fs->fs_cstotal.cs_nifree++; | |
b6407c9d | 1050 | fs->fs_cs(fs, cg).cs_nifree++; |
e1b76915 | 1051 | if ((ap->a_mode & IFMT) == IFDIR) { |
0947395d KM |
1052 | cgp->cg_cs.cs_ndir--; |
1053 | fs->fs_cstotal.cs_ndir--; | |
b6407c9d | 1054 | fs->fs_cs(fs, cg).cs_ndir--; |
e3fe2d69 | 1055 | } |
e809642a | 1056 | fs->fs_fmod = 1; |
e3fe2d69 | 1057 | bdwrite(bp); |
4e2f97fb | 1058 | return (0); |
e3fe2d69 KM |
1059 | } |
1060 | ||
743f1ef7 | 1061 | /* |
502770a3 KM |
1062 | * Find a block of the specified size in the specified cylinder group. |
1063 | * | |
743f1ef7 KM |
1064 | * It is a panic if a request is made to find a block if none are |
1065 | * available. | |
1066 | */ | |
6d3d8a1c KB |
1067 | static daddr_t |
1068 | ffs_mapsearch(fs, cgp, bpref, allocsiz) | |
743f1ef7 KM |
1069 | register struct fs *fs; |
1070 | register struct cg *cgp; | |
1071 | daddr_t bpref; | |
1072 | int allocsiz; | |
1073 | { | |
1074 | daddr_t bno; | |
1075 | int start, len, loc, i; | |
1076 | int blk, field, subfield, pos; | |
1077 | ||
1078 | /* | |
1079 | * find the fragment by searching through the free block | |
1080 | * map for an appropriate bit pattern | |
1081 | */ | |
1082 | if (bpref) | |
6994bf5d | 1083 | start = dtogd(fs, bpref) / NBBY; |
743f1ef7 KM |
1084 | else |
1085 | start = cgp->cg_frotor / NBBY; | |
942bd18b | 1086 | len = howmany(fs->fs_fpg, NBBY) - start; |
9523729e KM |
1087 | loc = scanc((unsigned)len, (u_char *)&cg_blksfree(cgp)[start], |
1088 | (u_char *)fragtbl[fs->fs_frag], | |
1089 | (u_char)(1 << (allocsiz - 1 + (fs->fs_frag % NBBY)))); | |
743f1ef7 | 1090 | if (loc == 0) { |
e5476900 KM |
1091 | len = start + 1; |
1092 | start = 0; | |
9523729e KM |
1093 | loc = scanc((unsigned)len, (u_char *)&cg_blksfree(cgp)[0], |
1094 | (u_char *)fragtbl[fs->fs_frag], | |
1095 | (u_char)(1 << (allocsiz - 1 + (fs->fs_frag % NBBY)))); | |
4e0c7b8a KM |
1096 | if (loc == 0) { |
1097 | printf("start = %d, len = %d, fs = %s\n", | |
1098 | start, len, fs->fs_fsmnt); | |
6d3d8a1c | 1099 | panic("ffs_alloccg: map corrupted"); |
e5889092 | 1100 | /* NOTREACHED */ |
4e0c7b8a | 1101 | } |
743f1ef7 KM |
1102 | } |
1103 | bno = (start + len - loc) * NBBY; | |
1104 | cgp->cg_frotor = bno; | |
1105 | /* | |
1106 | * found the byte in the map | |
1107 | * sift through the bits to find the selected frag | |
1108 | */ | |
ae851115 | 1109 | for (i = bno + NBBY; bno < i; bno += fs->fs_frag) { |
10adeb11 | 1110 | blk = blkmap(fs, cg_blksfree(cgp), bno); |
743f1ef7 KM |
1111 | blk <<= 1; |
1112 | field = around[allocsiz]; | |
1113 | subfield = inside[allocsiz]; | |
b6407c9d | 1114 | for (pos = 0; pos <= fs->fs_frag - allocsiz; pos++) { |
ae851115 KM |
1115 | if ((blk & field) == subfield) |
1116 | return (bno + pos); | |
743f1ef7 KM |
1117 | field <<= 1; |
1118 | subfield <<= 1; | |
1119 | } | |
1120 | } | |
ffd90e52 | 1121 | printf("bno = %d, fs = %s\n", bno, fs->fs_fsmnt); |
6d3d8a1c | 1122 | panic("ffs_alloccg: block not in map"); |
e5476900 | 1123 | return (-1); |
743f1ef7 KM |
1124 | } |
1125 | ||
e3fe2d69 | 1126 | /* |
502770a3 KM |
1127 | * Fserr prints the name of a file system with an error diagnostic. |
1128 | * | |
1129 | * The form of the error message is: | |
e3fe2d69 KM |
1130 | * fs: error message |
1131 | */ | |
6d3d8a1c KB |
1132 | static void |
1133 | ffs_fserr(fs, uid, cp) | |
e3fe2d69 | 1134 | struct fs *fs; |
6d3d8a1c | 1135 | u_int uid; |
e3fe2d69 KM |
1136 | char *cp; |
1137 | { | |
1138 | ||
e2546752 | 1139 | log(LOG_ERR, "uid %d on %s: %s\n", uid, fs->fs_fsmnt, cp); |
e3fe2d69 | 1140 | } |