1 /* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)ffs_alloc.c 8.18 (Berkeley) 5/26/95 30 * $FreeBSD: src/sys/ufs/ffs/ffs_alloc.c,v 1.64.2.2 2001/09/21 19:15:21 dillon Exp $ 31 */ 32 33 #include "opt_quota.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/buf.h> 38 #include <sys/conf.h> 39 #include <sys/proc.h> 40 #include <sys/vnode.h> 41 #include <sys/mount.h> 42 #include <sys/kernel.h> 43 #include <sys/sysctl.h> 44 #include <sys/syslog.h> 45 46 #include <sys/taskqueue.h> 47 #include <machine/inttypes.h> 48 49 #include <sys/buf2.h> 50 51 #include "quota.h" 52 #include "inode.h" 53 #include "ufs_extern.h" 54 #include "ufsmount.h" 55 56 #include "fs.h" 57 #include "ffs_extern.h" 58 59 typedef ufs_daddr_t allocfcn_t (struct inode *ip, int cg, ufs_daddr_t bpref, 60 int size); 61 62 static ufs_daddr_t ffs_alloccg (struct inode *, int, ufs_daddr_t, int); 63 static ufs_daddr_t 64 ffs_alloccgblk (struct inode *, struct buf *, ufs_daddr_t); 65 static void ffs_blkfree_cg(struct fs *, struct vnode *, cdev_t , ino_t, 66 uint32_t , ufs_daddr_t, long ); 67 #ifdef DIAGNOSTIC 68 static int ffs_checkblk (struct inode *, ufs_daddr_t, long); 69 #endif 70 static void ffs_clusteracct (struct fs *, struct cg *, ufs_daddr_t, 71 int); 72 static ufs_daddr_t ffs_clusteralloc (struct inode *, int, ufs_daddr_t, 73 int); 74 static ino_t ffs_dirpref (struct inode *); 75 static ufs_daddr_t ffs_fragextend (struct inode *, int, long, int, int); 76 static void ffs_fserr (struct fs *, uint, char *); 77 static u_long ffs_hashalloc 78 (struct inode *, int, long, int, allocfcn_t *); 79 static ino_t ffs_nodealloccg (struct inode *, int, ufs_daddr_t, int); 80 static ufs_daddr_t ffs_mapsearch (struct fs *, struct cg *, ufs_daddr_t, 81 int); 82 83 /* 84 * Allocate a block in the filesystem. 85 * 86 * The size of the requested block is given, which must be some 87 * multiple of fs_fsize and <= fs_bsize. 88 * A preference may be optionally specified. If a preference is given 89 * the following hierarchy is used to allocate a block: 90 * 1) allocate the requested block. 91 * 2) allocate a rotationally optimal block in the same cylinder. 92 * 3) allocate a block in the same cylinder group. 93 * 4) quadradically rehash into other cylinder groups, until an 94 * available block is located. 95 * If no block preference is given the following heirarchy is used 96 * to allocate a block: 97 * 1) allocate a block in the cylinder group that contains the 98 * inode for the file. 99 * 2) quadradically rehash into other cylinder groups, until an 100 * available block is located. 101 */ 102 int 103 ffs_alloc(struct inode *ip, ufs_daddr_t lbn, ufs_daddr_t bpref, int size, 104 struct ucred *cred, ufs_daddr_t *bnp) 105 { 106 struct fs *fs; 107 ufs_daddr_t bno; 108 int cg; 109 #ifdef QUOTA 110 int error; 111 #endif 112 113 *bnp = 0; 114 fs = ip->i_fs; 115 #ifdef DIAGNOSTIC 116 if ((uint)size > fs->fs_bsize || fragoff(fs, size) != 0) { 117 kprintf("dev = %s, bsize = %ld, size = %d, fs = %s\n", 118 devtoname(ip->i_dev), (long)fs->fs_bsize, size, 119 fs->fs_fsmnt); 120 panic("ffs_alloc: bad size"); 121 } 122 if (cred == NOCRED) 123 panic("ffs_alloc: missing credential"); 124 #endif /* DIAGNOSTIC */ 125 if (size == fs->fs_bsize && fs->fs_cstotal.cs_nbfree == 0) 126 goto nospace; 127 if (cred->cr_uid != 0 && 128 freespace(fs, fs->fs_minfree) - numfrags(fs, size) < 0) 129 goto nospace; 130 #ifdef QUOTA 131 error = ufs_chkdq(ip, (long)btodb(size), cred, 0); 132 if (error) 133 return (error); 134 #endif 135 if (bpref >= fs->fs_size) 136 bpref = 0; 137 if (bpref == 0) 138 cg = ino_to_cg(fs, ip->i_number); 139 else 140 cg = dtog(fs, bpref); 141 bno = (ufs_daddr_t)ffs_hashalloc(ip, cg, (long)bpref, size, 142 ffs_alloccg); 143 if (bno > 0) { 144 ip->i_blocks += btodb(size); 145 ip->i_flag |= IN_CHANGE | IN_UPDATE; 146 *bnp = bno; 147 return (0); 148 } 149 #ifdef QUOTA 150 /* 151 * Restore user's disk quota because allocation failed. 152 */ 153 (void) ufs_chkdq(ip, (long)-btodb(size), cred, FORCE); 154 #endif 155 nospace: 156 ffs_fserr(fs, cred->cr_uid, "filesystem full"); 157 uprintf("\n%s: write failed, filesystem is full\n", fs->fs_fsmnt); 158 return (ENOSPC); 159 } 160 161 /* 162 * Reallocate a fragment to a bigger size 163 * 164 * The number and size of the old block is given, and a preference 165 * and new size is also specified. The allocator attempts to extend 166 * the original block. Failing that, the regular block allocator is 167 * invoked to get an appropriate block. 168 */ 169 int 170 ffs_realloccg(struct inode *ip, ufs_daddr_t lbprev, ufs_daddr_t bpref, 171 int osize, int nsize, struct ucred *cred, struct buf **bpp) 172 { 173 struct fs *fs; 174 struct buf *bp; 175 int cg, request, error; 176 ufs_daddr_t bprev, bno; 177 178 *bpp = NULL; 179 fs = ip->i_fs; 180 #ifdef DIAGNOSTIC 181 if ((uint)osize > fs->fs_bsize || fragoff(fs, osize) != 0 || 182 (uint)nsize > fs->fs_bsize || fragoff(fs, nsize) != 0) { 183 kprintf( 184 "dev = %s, bsize = %ld, osize = %d, nsize = %d, fs = %s\n", 185 devtoname(ip->i_dev), (long)fs->fs_bsize, osize, 186 nsize, fs->fs_fsmnt); 187 panic("ffs_realloccg: bad size"); 188 } 189 if (cred == NOCRED) 190 panic("ffs_realloccg: missing credential"); 191 #endif /* DIAGNOSTIC */ 192 if (cred->cr_uid != 0 && 193 freespace(fs, fs->fs_minfree) - numfrags(fs, nsize - osize) < 0) 194 goto nospace; 195 if ((bprev = ip->i_db[lbprev]) == 0) { 196 kprintf("dev = %s, bsize = %ld, bprev = %ld, fs = %s\n", 197 devtoname(ip->i_dev), (long)fs->fs_bsize, (long)bprev, 198 fs->fs_fsmnt); 199 panic("ffs_realloccg: bad bprev"); 200 } 201 /* 202 * Allocate the extra space in the buffer. 203 */ 204 error = bread(ITOV(ip), lblktodoff(fs, lbprev), osize, &bp); 205 if (error) { 206 brelse(bp); 207 return (error); 208 } 209 210 if(bp->b_bio2.bio_offset == NOOFFSET) { 211 if( lbprev >= NDADDR) 212 panic("ffs_realloccg: lbprev out of range"); 213 bp->b_bio2.bio_offset = fsbtodoff(fs, bprev); 214 } 215 216 #ifdef QUOTA 217 error = ufs_chkdq(ip, (long)btodb(nsize - osize), cred, 0); 218 if (error) { 219 brelse(bp); 220 return (error); 221 } 222 #endif 223 /* 224 * Check for extension in the existing location. 225 */ 226 cg = dtog(fs, bprev); 227 bno = ffs_fragextend(ip, cg, (long)bprev, osize, nsize); 228 if (bno) { 229 if (bp->b_bio2.bio_offset != fsbtodoff(fs, bno)) 230 panic("ffs_realloccg: bad blockno"); 231 ip->i_blocks += btodb(nsize - osize); 232 ip->i_flag |= IN_CHANGE | IN_UPDATE; 233 allocbuf(bp, nsize); 234 bzero((char *)bp->b_data + osize, (uint)nsize - osize); 235 *bpp = bp; 236 return (0); 237 } 238 /* 239 * Allocate a new disk location. 240 */ 241 if (bpref >= fs->fs_size) 242 bpref = 0; 243 switch ((int)fs->fs_optim) { 244 case FS_OPTSPACE: 245 /* 246 * Allocate an exact sized fragment. Although this makes 247 * best use of space, we will waste time relocating it if 248 * the file continues to grow. If the fragmentation is 249 * less than half of the minimum free reserve, we choose 250 * to begin optimizing for time. 251 */ 252 request = nsize; 253 if (fs->fs_minfree <= 5 || 254 fs->fs_cstotal.cs_nffree > 255 (off_t)fs->fs_dsize * fs->fs_minfree / (2 * 100)) 256 break; 257 log(LOG_NOTICE, "%s: optimization changed from SPACE to TIME\n", 258 fs->fs_fsmnt); 259 fs->fs_optim = FS_OPTTIME; 260 break; 261 case FS_OPTTIME: 262 /* 263 * At this point we have discovered a file that is trying to 264 * grow a small fragment to a larger fragment. To save time, 265 * we allocate a full sized block, then free the unused portion. 266 * If the file continues to grow, the `ffs_fragextend' call 267 * above will be able to grow it in place without further 268 * copying. If aberrant programs cause disk fragmentation to 269 * grow within 2% of the free reserve, we choose to begin 270 * optimizing for space. 271 */ 272 request = fs->fs_bsize; 273 if (fs->fs_cstotal.cs_nffree < 274 (off_t)fs->fs_dsize * (fs->fs_minfree - 2) / 100) 275 break; 276 log(LOG_NOTICE, "%s: optimization changed from TIME to SPACE\n", 277 fs->fs_fsmnt); 278 fs->fs_optim = FS_OPTSPACE; 279 break; 280 default: 281 kprintf("dev = %s, optim = %ld, fs = %s\n", 282 devtoname(ip->i_dev), (long)fs->fs_optim, fs->fs_fsmnt); 283 panic("ffs_realloccg: bad optim"); 284 /* NOTREACHED */ 285 } 286 bno = (ufs_daddr_t)ffs_hashalloc(ip, cg, (long)bpref, request, 287 ffs_alloccg); 288 if (bno > 0) { 289 bp->b_bio2.bio_offset = fsbtodoff(fs, bno); 290 if (!DOINGSOFTDEP(ITOV(ip))) 291 ffs_blkfree(ip, bprev, (long)osize); 292 if (nsize < request) 293 ffs_blkfree(ip, bno + numfrags(fs, nsize), 294 (long)(request - nsize)); 295 ip->i_blocks += btodb(nsize - osize); 296 ip->i_flag |= IN_CHANGE | IN_UPDATE; 297 allocbuf(bp, nsize); 298 bzero((char *)bp->b_data + osize, (uint)nsize - osize); 299 *bpp = bp; 300 return (0); 301 } 302 #ifdef QUOTA 303 /* 304 * Restore user's disk quota because allocation failed. 305 */ 306 (void) ufs_chkdq(ip, (long)-btodb(nsize - osize), cred, FORCE); 307 #endif 308 brelse(bp); 309 nospace: 310 /* 311 * no space available 312 */ 313 ffs_fserr(fs, cred->cr_uid, "filesystem full"); 314 uprintf("\n%s: write failed, filesystem is full\n", fs->fs_fsmnt); 315 return (ENOSPC); 316 } 317 318 SYSCTL_NODE(_vfs, OID_AUTO, ffs, CTLFLAG_RW, 0, "FFS filesystem"); 319 320 /* 321 * Reallocate a sequence of blocks into a contiguous sequence of blocks. 322 * 323 * The vnode and an array of buffer pointers for a range of sequential 324 * logical blocks to be made contiguous is given. The allocator attempts 325 * to find a range of sequential blocks starting as close as possible to 326 * an fs_rotdelay offset from the end of the allocation for the logical 327 * block immediately preceeding the current range. If successful, the 328 * physical block numbers in the buffer pointers and in the inode are 329 * changed to reflect the new allocation. If unsuccessful, the allocation 330 * is left unchanged. The success in doing the reallocation is returned. 331 * Note that the error return is not reflected back to the user. Rather 332 * the previous block allocation will be used. 333 */ 334 static int doasyncfree = 1; 335 SYSCTL_INT(_vfs_ffs, FFS_ASYNCFREE, doasyncfree, CTLFLAG_RW, &doasyncfree, 0, ""); 336 337 static int doreallocblks = 1; 338 SYSCTL_INT(_vfs_ffs, FFS_REALLOCBLKS, doreallocblks, CTLFLAG_RW, &doreallocblks, 0, ""); 339 340 #ifdef DEBUG 341 static volatile int prtrealloc = 0; 342 #endif 343 344 /* 345 * ffs_reallocblks(struct vnode *a_vp, struct cluster_save *a_buflist) 346 */ 347 int 348 ffs_reallocblks(struct vop_reallocblks_args *ap) 349 { 350 struct fs *fs; 351 struct inode *ip; 352 struct vnode *vp; 353 struct buf *sbp, *ebp; 354 ufs_daddr_t *bap, *sbap, *ebap = NULL; 355 struct cluster_save *buflist; 356 ufs_daddr_t start_lbn, end_lbn, soff, newblk, blkno; 357 #ifdef DIAGNOSTIC 358 off_t boffset; 359 #endif 360 struct indir start_ap[NIADDR + 1], end_ap[NIADDR + 1], *idp; 361 int i, len, slen, start_lvl, end_lvl, pref, ssize; 362 363 if (doreallocblks == 0) 364 return (ENOSPC); 365 vp = ap->a_vp; 366 ip = VTOI(vp); 367 fs = ip->i_fs; 368 if (fs->fs_contigsumsize <= 0) 369 return (ENOSPC); 370 buflist = ap->a_buflist; 371 len = buflist->bs_nchildren; 372 start_lbn = lblkno(fs, buflist->bs_children[0]->b_loffset); 373 end_lbn = start_lbn + len - 1; 374 #ifdef DIAGNOSTIC 375 for (i = 0; i < len; i++) 376 if (!ffs_checkblk(ip, 377 dofftofsb(fs, buflist->bs_children[i]->b_bio2.bio_offset), fs->fs_bsize)) 378 panic("ffs_reallocblks: unallocated block 1"); 379 for (i = 1; i < len; i++) { 380 if (buflist->bs_children[i]->b_loffset != lblktodoff(fs, start_lbn) + lblktodoff(fs, i)) 381 panic("ffs_reallocblks: non-logical cluster"); 382 } 383 boffset = buflist->bs_children[0]->b_bio2.bio_offset; 384 ssize = (int)fsbtodoff(fs, fs->fs_frag); 385 for (i = 1; i < len - 1; i++) 386 if (buflist->bs_children[i]->b_bio2.bio_offset != boffset + (i * ssize)) 387 panic("ffs_reallocblks: non-physical cluster %d", i); 388 #endif 389 /* 390 * If the latest allocation is in a new cylinder group, assume that 391 * the filesystem has decided to move and do not force it back to 392 * the previous cylinder group. 393 */ 394 if (dtog(fs, dofftofsb(fs, buflist->bs_children[0]->b_bio2.bio_offset)) != 395 dtog(fs, dofftofsb(fs, buflist->bs_children[len - 1]->b_bio2.bio_offset))) 396 return (ENOSPC); 397 if (ufs_getlbns(vp, start_lbn, start_ap, &start_lvl) || 398 ufs_getlbns(vp, end_lbn, end_ap, &end_lvl)) 399 return (ENOSPC); 400 /* 401 * Get the starting offset and block map for the first block and 402 * the number of blocks that will fit into sbap starting at soff. 403 */ 404 if (start_lvl == 0) { 405 sbap = &ip->i_db[0]; 406 soff = start_lbn; 407 slen = NDADDR - soff; 408 } else { 409 idp = &start_ap[start_lvl - 1]; 410 if (bread(vp, lblktodoff(fs, idp->in_lbn), (int)fs->fs_bsize, &sbp)) { 411 brelse(sbp); 412 return (ENOSPC); 413 } 414 sbap = (ufs_daddr_t *)sbp->b_data; 415 soff = idp->in_off; 416 slen = fs->fs_nindir - soff; 417 } 418 /* 419 * Find the preferred location for the cluster. 420 */ 421 pref = ffs_blkpref(ip, start_lbn, soff, sbap); 422 423 /* 424 * If the block range spans two block maps, get the second map. 425 */ 426 if (end_lvl == 0 || (idp = &end_ap[end_lvl - 1])->in_off + 1 >= len) { 427 ssize = len; 428 } else { 429 #ifdef DIAGNOSTIC 430 if (start_ap[start_lvl-1].in_lbn == idp->in_lbn) 431 panic("ffs_reallocblk: start == end"); 432 #endif 433 ssize = len - (idp->in_off + 1); 434 if (bread(vp, lblktodoff(fs, idp->in_lbn), (int)fs->fs_bsize, &ebp)) 435 goto fail; 436 ebap = (ufs_daddr_t *)ebp->b_data; 437 } 438 439 /* 440 * Make sure we aren't spanning more then two blockmaps. ssize is 441 * our calculation of the span we have to scan in the first blockmap, 442 * while slen is our calculation of the number of entries available 443 * in the first blockmap (from soff). 444 */ 445 if (ssize > slen) { 446 panic("ffs_reallocblks: range spans more then two blockmaps!" 447 " start_lbn %ld len %d (%d/%d)", 448 (long)start_lbn, len, slen, ssize); 449 } 450 /* 451 * Search the block map looking for an allocation of the desired size. 452 */ 453 if ((newblk = (ufs_daddr_t)ffs_hashalloc(ip, dtog(fs, pref), (long)pref, 454 len, ffs_clusteralloc)) == 0) 455 goto fail; 456 /* 457 * We have found a new contiguous block. 458 * 459 * First we have to replace the old block pointers with the new 460 * block pointers in the inode and indirect blocks associated 461 * with the file. 462 */ 463 #ifdef DEBUG 464 if (prtrealloc) 465 kprintf("realloc: ino %ju, lbns %d-%d\n\told:", 466 (uintmax_t)ip->i_number, start_lbn, end_lbn); 467 #endif 468 blkno = newblk; 469 for (bap = &sbap[soff], i = 0; i < len; i++, blkno += fs->fs_frag) { 470 if (i == ssize) { 471 bap = ebap; 472 soff = -i; 473 } 474 #ifdef DIAGNOSTIC 475 if (!ffs_checkblk(ip, 476 dofftofsb(fs, buflist->bs_children[i]->b_bio2.bio_offset), fs->fs_bsize)) 477 panic("ffs_reallocblks: unallocated block 2"); 478 if (dofftofsb(fs, buflist->bs_children[i]->b_bio2.bio_offset) != *bap) 479 panic("ffs_reallocblks: alloc mismatch"); 480 #endif 481 #ifdef DEBUG 482 if (prtrealloc) 483 kprintf(" %d,", *bap); 484 #endif 485 if (DOINGSOFTDEP(vp)) { 486 if (sbap == &ip->i_db[0] && i < ssize) 487 softdep_setup_allocdirect(ip, start_lbn + i, 488 blkno, *bap, fs->fs_bsize, fs->fs_bsize, 489 buflist->bs_children[i]); 490 else 491 softdep_setup_allocindir_page(ip, start_lbn + i, 492 i < ssize ? sbp : ebp, soff + i, blkno, 493 *bap, buflist->bs_children[i]); 494 } 495 *bap++ = blkno; 496 } 497 /* 498 * Next we must write out the modified inode and indirect blocks. 499 * For strict correctness, the writes should be synchronous since 500 * the old block values may have been written to disk. In practise 501 * they are almost never written, but if we are concerned about 502 * strict correctness, the `doasyncfree' flag should be set to zero. 503 * 504 * The test on `doasyncfree' should be changed to test a flag 505 * that shows whether the associated buffers and inodes have 506 * been written. The flag should be set when the cluster is 507 * started and cleared whenever the buffer or inode is flushed. 508 * We can then check below to see if it is set, and do the 509 * synchronous write only when it has been cleared. 510 */ 511 if (sbap != &ip->i_db[0]) { 512 if (doasyncfree) 513 bdwrite(sbp); 514 else 515 bwrite(sbp); 516 } else { 517 ip->i_flag |= IN_CHANGE | IN_UPDATE; 518 if (!doasyncfree) 519 ffs_update(vp, 1); 520 } 521 if (ssize < len) { 522 if (doasyncfree) 523 bdwrite(ebp); 524 else 525 bwrite(ebp); 526 } 527 /* 528 * Last, free the old blocks and assign the new blocks to the buffers. 529 */ 530 #ifdef DEBUG 531 if (prtrealloc) 532 kprintf("\n\tnew:"); 533 #endif 534 for (blkno = newblk, i = 0; i < len; i++, blkno += fs->fs_frag) { 535 if (!DOINGSOFTDEP(vp)) 536 ffs_blkfree(ip, 537 dofftofsb(fs, buflist->bs_children[i]->b_bio2.bio_offset), 538 fs->fs_bsize); 539 buflist->bs_children[i]->b_bio2.bio_offset = fsbtodoff(fs, blkno); 540 #ifdef DIAGNOSTIC 541 if (!ffs_checkblk(ip, 542 dofftofsb(fs, buflist->bs_children[i]->b_bio2.bio_offset), fs->fs_bsize)) 543 panic("ffs_reallocblks: unallocated block 3"); 544 #endif 545 #ifdef DEBUG 546 if (prtrealloc) 547 kprintf(" %d,", blkno); 548 #endif 549 } 550 #ifdef DEBUG 551 if (prtrealloc) { 552 prtrealloc--; 553 kprintf("\n"); 554 } 555 #endif 556 return (0); 557 558 fail: 559 if (ssize < len) 560 brelse(ebp); 561 if (sbap != &ip->i_db[0]) 562 brelse(sbp); 563 return (ENOSPC); 564 } 565 566 /* 567 * Allocate an inode in the filesystem. 568 * 569 * If allocating a directory, use ffs_dirpref to select the inode. 570 * If allocating in a directory, the following hierarchy is followed: 571 * 1) allocate the preferred inode. 572 * 2) allocate an inode in the same cylinder group. 573 * 3) quadradically rehash into other cylinder groups, until an 574 * available inode is located. 575 * If no inode preference is given the following heirarchy is used 576 * to allocate an inode: 577 * 1) allocate an inode in cylinder group 0. 578 * 2) quadradically rehash into other cylinder groups, until an 579 * available inode is located. 580 */ 581 int 582 ffs_valloc(struct vnode *pvp, int mode, struct ucred *cred, struct vnode **vpp) 583 { 584 struct inode *pip; 585 struct fs *fs; 586 struct inode *ip; 587 ino_t ino, ipref; 588 int cg, error; 589 590 *vpp = NULL; 591 pip = VTOI(pvp); 592 fs = pip->i_fs; 593 if (fs->fs_cstotal.cs_nifree == 0) 594 goto noinodes; 595 596 if ((mode & IFMT) == IFDIR) 597 ipref = ffs_dirpref(pip); 598 else 599 ipref = pip->i_number; 600 if (ipref >= fs->fs_ncg * fs->fs_ipg) 601 ipref = 0; 602 cg = ino_to_cg(fs, ipref); 603 /* 604 * Track number of dirs created one after another 605 * in a same cg without intervening by files. 606 */ 607 if ((mode & IFMT) == IFDIR) { 608 if (fs->fs_contigdirs[cg] < 255) 609 fs->fs_contigdirs[cg]++; 610 } else { 611 if (fs->fs_contigdirs[cg] > 0) 612 fs->fs_contigdirs[cg]--; 613 } 614 ino = (ino_t)ffs_hashalloc(pip, cg, (long)ipref, mode, 615 (allocfcn_t *)ffs_nodealloccg); 616 if (ino == 0) 617 goto noinodes; 618 error = VFS_VGET(pvp->v_mount, NULL, ino, vpp); 619 if (error) { 620 ffs_vfree(pvp, ino, mode); 621 return (error); 622 } 623 ip = VTOI(*vpp); 624 if (ip->i_mode) { 625 kprintf("mode = 0%o, inum = %lu, fs = %s\n", 626 ip->i_mode, (u_long)ip->i_number, fs->fs_fsmnt); 627 panic("ffs_valloc: dup alloc"); 628 } 629 if (ip->i_blocks) { /* XXX */ 630 kprintf("free inode %s/%lu had %ld blocks\n", 631 fs->fs_fsmnt, (u_long)ino, (long)ip->i_blocks); 632 ip->i_blocks = 0; 633 } 634 ip->i_flags = 0; 635 /* 636 * Set up a new generation number for this inode. 637 */ 638 if (ip->i_gen == 0 || ++ip->i_gen == 0) 639 ip->i_gen = krandom() / 2 + 1; 640 return (0); 641 noinodes: 642 ffs_fserr(fs, cred->cr_uid, "out of inodes"); 643 uprintf("\n%s: create/symlink failed, no inodes free\n", fs->fs_fsmnt); 644 return (ENOSPC); 645 } 646 647 /* 648 * Find a cylinder group to place a directory. 649 * 650 * The policy implemented by this algorithm is to allocate a 651 * directory inode in the same cylinder group as its parent 652 * directory, but also to reserve space for its files inodes 653 * and data. Restrict the number of directories which may be 654 * allocated one after another in the same cylinder group 655 * without intervening allocation of files. 656 * 657 * If we allocate a first level directory then force allocation 658 * in another cylinder group. 659 */ 660 static ino_t 661 ffs_dirpref(struct inode *pip) 662 { 663 struct fs *fs; 664 int cg, prefcg, dirsize, cgsize; 665 int64_t dirsize64; 666 int avgifree, avgbfree, avgndir, curdirsize; 667 int minifree, minbfree, maxndir; 668 int mincg, minndir; 669 int maxcontigdirs; 670 671 fs = pip->i_fs; 672 673 avgifree = fs->fs_cstotal.cs_nifree / fs->fs_ncg; 674 avgbfree = fs->fs_cstotal.cs_nbfree / fs->fs_ncg; 675 avgndir = fs->fs_cstotal.cs_ndir / fs->fs_ncg; 676 677 /* 678 * Force allocation in another cg if creating a first level dir. 679 */ 680 if (ITOV(pip)->v_flag & VROOT) { 681 prefcg = karc4random() % fs->fs_ncg; 682 mincg = prefcg; 683 minndir = fs->fs_ipg; 684 for (cg = prefcg; cg < fs->fs_ncg; cg++) 685 if (fs->fs_cs(fs, cg).cs_ndir < minndir && 686 fs->fs_cs(fs, cg).cs_nifree >= avgifree && 687 fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) { 688 mincg = cg; 689 minndir = fs->fs_cs(fs, cg).cs_ndir; 690 } 691 for (cg = 0; cg < prefcg; cg++) 692 if (fs->fs_cs(fs, cg).cs_ndir < minndir && 693 fs->fs_cs(fs, cg).cs_nifree >= avgifree && 694 fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) { 695 mincg = cg; 696 minndir = fs->fs_cs(fs, cg).cs_ndir; 697 } 698 return ((ino_t)(fs->fs_ipg * mincg)); 699 } 700 701 /* 702 * Count various limits which used for 703 * optimal allocation of a directory inode. 704 */ 705 maxndir = min(avgndir + fs->fs_ipg / 16, fs->fs_ipg); 706 minifree = avgifree - avgifree / 4; 707 if (minifree < 1) 708 minifree = 1; 709 minbfree = avgbfree - avgbfree / 4; 710 if (minbfree < 1) 711 minbfree = 1; 712 cgsize = fs->fs_fsize * fs->fs_fpg; 713 714 /* 715 * fs_avgfilesize and fs_avgfpdir are user-settable entities and 716 * multiplying them may overflow a 32 bit integer. 717 */ 718 dirsize64 = fs->fs_avgfilesize * (int64_t)fs->fs_avgfpdir; 719 if (dirsize64 > 0x7fffffff) { 720 maxcontigdirs = 1; 721 } else { 722 dirsize = (int)dirsize64; 723 curdirsize = avgndir ? 724 (cgsize - avgbfree * fs->fs_bsize) / avgndir : 0; 725 if (dirsize < curdirsize) 726 dirsize = curdirsize; 727 maxcontigdirs = min((avgbfree * fs->fs_bsize) / dirsize, 255); 728 if (fs->fs_avgfpdir > 0) 729 maxcontigdirs = min(maxcontigdirs, 730 fs->fs_ipg / fs->fs_avgfpdir); 731 if (maxcontigdirs == 0) 732 maxcontigdirs = 1; 733 } 734 735 /* 736 * Limit number of dirs in one cg and reserve space for 737 * regular files, but only if we have no deficit in 738 * inodes or space. 739 */ 740 prefcg = ino_to_cg(fs, pip->i_number); 741 for (cg = prefcg; cg < fs->fs_ncg; cg++) 742 if (fs->fs_cs(fs, cg).cs_ndir < maxndir && 743 fs->fs_cs(fs, cg).cs_nifree >= minifree && 744 fs->fs_cs(fs, cg).cs_nbfree >= minbfree) { 745 if (fs->fs_contigdirs[cg] < maxcontigdirs) 746 return ((ino_t)(fs->fs_ipg * cg)); 747 } 748 for (cg = 0; cg < prefcg; cg++) 749 if (fs->fs_cs(fs, cg).cs_ndir < maxndir && 750 fs->fs_cs(fs, cg).cs_nifree >= minifree && 751 fs->fs_cs(fs, cg).cs_nbfree >= minbfree) { 752 if (fs->fs_contigdirs[cg] < maxcontigdirs) 753 return ((ino_t)(fs->fs_ipg * cg)); 754 } 755 /* 756 * This is a backstop when we have deficit in space. 757 */ 758 for (cg = prefcg; cg < fs->fs_ncg; cg++) 759 if (fs->fs_cs(fs, cg).cs_nifree >= avgifree) 760 return ((ino_t)(fs->fs_ipg * cg)); 761 for (cg = 0; cg < prefcg; cg++) 762 if (fs->fs_cs(fs, cg).cs_nifree >= avgifree) 763 break; 764 return ((ino_t)(fs->fs_ipg * cg)); 765 } 766 767 /* 768 * Select the desired position for the next block in a file. The file is 769 * logically divided into sections. The first section is composed of the 770 * direct blocks. Each additional section contains fs_maxbpg blocks. 771 * 772 * If no blocks have been allocated in the first section, the policy is to 773 * request a block in the same cylinder group as the inode that describes 774 * the file. If no blocks have been allocated in any other section, the 775 * policy is to place the section in a cylinder group with a greater than 776 * average number of free blocks. An appropriate cylinder group is found 777 * by using a rotor that sweeps the cylinder groups. When a new group of 778 * blocks is needed, the sweep begins in the cylinder group following the 779 * cylinder group from which the previous allocation was made. The sweep 780 * continues until a cylinder group with greater than the average number 781 * of free blocks is found. If the allocation is for the first block in an 782 * indirect block, the information on the previous allocation is unavailable; 783 * here a best guess is made based upon the logical block number being 784 * allocated. 785 * 786 * If a section is already partially allocated, the policy is to 787 * contiguously allocate fs_maxcontig blocks. The end of one of these 788 * contiguous blocks and the beginning of the next is physically separated 789 * so that the disk head will be in transit between them for at least 790 * fs_rotdelay milliseconds. This is to allow time for the processor to 791 * schedule another I/O transfer. 792 */ 793 ufs_daddr_t 794 ffs_blkpref(struct inode *ip, ufs_daddr_t lbn, int indx, ufs_daddr_t *bap) 795 { 796 struct fs *fs; 797 int cg; 798 int avgbfree, startcg; 799 ufs_daddr_t nextblk; 800 801 fs = ip->i_fs; 802 if (indx % fs->fs_maxbpg == 0 || bap[indx - 1] == 0) { 803 if (lbn < NDADDR + NINDIR(fs)) { 804 cg = ino_to_cg(fs, ip->i_number); 805 return (fs->fs_fpg * cg + fs->fs_frag); 806 } 807 /* 808 * Find a cylinder with greater than average number of 809 * unused data blocks. 810 */ 811 if (indx == 0 || bap[indx - 1] == 0) 812 startcg = 813 ino_to_cg(fs, ip->i_number) + lbn / fs->fs_maxbpg; 814 else 815 startcg = dtog(fs, bap[indx - 1]) + 1; 816 startcg %= fs->fs_ncg; 817 avgbfree = fs->fs_cstotal.cs_nbfree / fs->fs_ncg; 818 for (cg = startcg; cg < fs->fs_ncg; cg++) 819 if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) { 820 fs->fs_cgrotor = cg; 821 return (fs->fs_fpg * cg + fs->fs_frag); 822 } 823 for (cg = 0; cg <= startcg; cg++) 824 if (fs->fs_cs(fs, cg).cs_nbfree >= avgbfree) { 825 fs->fs_cgrotor = cg; 826 return (fs->fs_fpg * cg + fs->fs_frag); 827 } 828 return (0); 829 } 830 /* 831 * One or more previous blocks have been laid out. If less 832 * than fs_maxcontig previous blocks are contiguous, the 833 * next block is requested contiguously, otherwise it is 834 * requested rotationally delayed by fs_rotdelay milliseconds. 835 */ 836 nextblk = bap[indx - 1] + fs->fs_frag; 837 if (fs->fs_rotdelay == 0 || indx < fs->fs_maxcontig || 838 bap[indx - fs->fs_maxcontig] + 839 blkstofrags(fs, fs->fs_maxcontig) != nextblk) 840 return (nextblk); 841 /* 842 * Here we convert ms of delay to frags as: 843 * (frags) = (ms) * (rev/sec) * (sect/rev) / 844 * ((sect/frag) * (ms/sec)) 845 * then round up to the next block. 846 */ 847 nextblk += roundup(fs->fs_rotdelay * fs->fs_rps * fs->fs_nsect / 848 (NSPF(fs) * 1000), fs->fs_frag); 849 return (nextblk); 850 } 851 852 /* 853 * Implement the cylinder overflow algorithm. 854 * 855 * The policy implemented by this algorithm is: 856 * 1) allocate the block in its requested cylinder group. 857 * 2) quadradically rehash on the cylinder group number. 858 * 3) brute force search for a free block. 859 */ 860 /*VARARGS5*/ 861 static u_long 862 ffs_hashalloc(struct inode *ip, int cg, long pref, 863 int size, /* size for data blocks, mode for inodes */ 864 allocfcn_t *allocator) 865 { 866 struct fs *fs; 867 long result; /* XXX why not same type as we return? */ 868 int i, icg = cg; 869 870 fs = ip->i_fs; 871 /* 872 * 1: preferred cylinder group 873 */ 874 result = (*allocator)(ip, cg, pref, size); 875 if (result) 876 return (result); 877 /* 878 * 2: quadratic rehash 879 */ 880 for (i = 1; i < fs->fs_ncg; i *= 2) { 881 cg += i; 882 if (cg >= fs->fs_ncg) 883 cg -= fs->fs_ncg; 884 result = (*allocator)(ip, cg, 0, size); 885 if (result) 886 return (result); 887 } 888 /* 889 * 3: brute force search 890 * Note that we start at i == 2, since 0 was checked initially, 891 * and 1 is always checked in the quadratic rehash. 892 */ 893 cg = (icg + 2) % fs->fs_ncg; 894 for (i = 2; i < fs->fs_ncg; i++) { 895 result = (*allocator)(ip, cg, 0, size); 896 if (result) 897 return (result); 898 cg++; 899 if (cg == fs->fs_ncg) 900 cg = 0; 901 } 902 return (0); 903 } 904 905 /* 906 * Determine whether a fragment can be extended. 907 * 908 * Check to see if the necessary fragments are available, and 909 * if they are, allocate them. 910 */ 911 static ufs_daddr_t 912 ffs_fragextend(struct inode *ip, int cg, long bprev, int osize, int nsize) 913 { 914 struct fs *fs; 915 struct cg *cgp; 916 struct buf *bp; 917 long bno; 918 int frags, bbase; 919 int i, error; 920 uint8_t *blksfree; 921 922 fs = ip->i_fs; 923 if (fs->fs_cs(fs, cg).cs_nffree < numfrags(fs, nsize - osize)) 924 return (0); 925 frags = numfrags(fs, nsize); 926 bbase = fragnum(fs, bprev); 927 if (bbase > fragnum(fs, (bprev + frags - 1))) { 928 /* cannot extend across a block boundary */ 929 return (0); 930 } 931 KKASSERT(blknum(fs, bprev) == blknum(fs, bprev + frags - 1)); 932 error = bread(ip->i_devvp, fsbtodoff(fs, cgtod(fs, cg)), 933 (int)fs->fs_cgsize, &bp); 934 if (error) { 935 brelse(bp); 936 return (0); 937 } 938 cgp = (struct cg *)bp->b_data; 939 if (!cg_chkmagic(cgp)) { 940 brelse(bp); 941 return (0); 942 } 943 cgp->cg_time = time_second; 944 bno = dtogd(fs, bprev); 945 blksfree = cg_blksfree(cgp); 946 for (i = numfrags(fs, osize); i < frags; i++) { 947 if (isclr(blksfree, bno + i)) { 948 brelse(bp); 949 return (0); 950 } 951 } 952 953 /* 954 * the current fragment can be extended 955 * deduct the count on fragment being extended into 956 * increase the count on the remaining fragment (if any) 957 * allocate the extended piece 958 * 959 * ---oooooooooonnnnnnn111---- 960 * [-----frags-----] 961 * ^ ^ 962 * bbase fs_frag 963 */ 964 for (i = frags; i < fs->fs_frag - bbase; i++) { 965 if (isclr(blksfree, bno + i)) 966 break; 967 } 968 969 /* 970 * Size of original free frag is [i - numfrags(fs, osize)] 971 * Size of remaining free frag is [i - frags] 972 */ 973 cgp->cg_frsum[i - numfrags(fs, osize)]--; 974 if (i != frags) 975 cgp->cg_frsum[i - frags]++; 976 for (i = numfrags(fs, osize); i < frags; i++) { 977 clrbit(blksfree, bno + i); 978 cgp->cg_cs.cs_nffree--; 979 fs->fs_cstotal.cs_nffree--; 980 fs->fs_cs(fs, cg).cs_nffree--; 981 } 982 fs->fs_fmod = 1; 983 if (DOINGSOFTDEP(ITOV(ip))) 984 softdep_setup_blkmapdep(bp, fs, bprev); 985 bdwrite(bp); 986 return (bprev); 987 } 988 989 /* 990 * Determine whether a block can be allocated. 991 * 992 * Check to see if a block of the appropriate size is available, 993 * and if it is, allocate it. 994 */ 995 static ufs_daddr_t 996 ffs_alloccg(struct inode *ip, int cg, ufs_daddr_t bpref, int size) 997 { 998 struct fs *fs; 999 struct cg *cgp; 1000 struct buf *bp; 1001 int i; 1002 ufs_daddr_t bno, blkno; 1003 int allocsiz, error, frags; 1004 uint8_t *blksfree; 1005 1006 fs = ip->i_fs; 1007 if (fs->fs_cs(fs, cg).cs_nbfree == 0 && size == fs->fs_bsize) 1008 return (0); 1009 error = bread(ip->i_devvp, fsbtodoff(fs, cgtod(fs, cg)), 1010 (int)fs->fs_cgsize, &bp); 1011 if (error) { 1012 brelse(bp); 1013 return (0); 1014 } 1015 cgp = (struct cg *)bp->b_data; 1016 if (!cg_chkmagic(cgp) || 1017 (cgp->cg_cs.cs_nbfree == 0 && size == fs->fs_bsize)) { 1018 brelse(bp); 1019 return (0); 1020 } 1021 cgp->cg_time = time_second; 1022 if (size == fs->fs_bsize) { 1023 bno = ffs_alloccgblk(ip, bp, bpref); 1024 bdwrite(bp); 1025 return (bno); 1026 } 1027 /* 1028 * Check to see if any fragments of sufficient size are already 1029 * available. Fit the data into a larger fragment if necessary, 1030 * before allocating a whole new block. 1031 */ 1032 blksfree = cg_blksfree(cgp); 1033 frags = numfrags(fs, size); 1034 for (allocsiz = frags; allocsiz < fs->fs_frag; allocsiz++) { 1035 if (cgp->cg_frsum[allocsiz] != 0) 1036 break; 1037 } 1038 if (allocsiz == fs->fs_frag) { 1039 /* 1040 * No fragments were available, allocate a whole block and 1041 * cut the requested fragment (of size frags) out of it. 1042 */ 1043 if (cgp->cg_cs.cs_nbfree == 0) { 1044 brelse(bp); 1045 return (0); 1046 } 1047 bno = ffs_alloccgblk(ip, bp, bpref); 1048 bpref = dtogd(fs, bno); 1049 for (i = frags; i < fs->fs_frag; i++) 1050 setbit(blksfree, bpref + i); 1051 1052 /* 1053 * Calculate the number of free frags still remaining after 1054 * we have cut out the requested allocation. Indicate that 1055 * a fragment of that size is now available for future 1056 * allocation. 1057 */ 1058 i = fs->fs_frag - frags; 1059 cgp->cg_cs.cs_nffree += i; 1060 fs->fs_cstotal.cs_nffree += i; 1061 fs->fs_cs(fs, cg).cs_nffree += i; 1062 fs->fs_fmod = 1; 1063 cgp->cg_frsum[i]++; 1064 bdwrite(bp); 1065 return (bno); 1066 } 1067 1068 /* 1069 * cg_frsum[] has told us that a free fragment of allocsiz size is 1070 * available. Find it, then clear the bitmap bits associated with 1071 * the size we want. 1072 */ 1073 bno = ffs_mapsearch(fs, cgp, bpref, allocsiz); 1074 if (bno < 0) { 1075 brelse(bp); 1076 return (0); 1077 } 1078 for (i = 0; i < frags; i++) 1079 clrbit(blksfree, bno + i); 1080 cgp->cg_cs.cs_nffree -= frags; 1081 fs->fs_cstotal.cs_nffree -= frags; 1082 fs->fs_cs(fs, cg).cs_nffree -= frags; 1083 fs->fs_fmod = 1; 1084 1085 /* 1086 * Account for the allocation. The original searched size that we 1087 * found is no longer available. If we cut out a smaller piece then 1088 * a smaller fragment is now available. 1089 */ 1090 cgp->cg_frsum[allocsiz]--; 1091 if (frags != allocsiz) 1092 cgp->cg_frsum[allocsiz - frags]++; 1093 blkno = cg * fs->fs_fpg + bno; 1094 if (DOINGSOFTDEP(ITOV(ip))) 1095 softdep_setup_blkmapdep(bp, fs, blkno); 1096 bdwrite(bp); 1097 return ((u_long)blkno); 1098 } 1099 1100 /* 1101 * Allocate a block in a cylinder group. 1102 * 1103 * This algorithm implements the following policy: 1104 * 1) allocate the requested block. 1105 * 2) allocate a rotationally optimal block in the same cylinder. 1106 * 3) allocate the next available block on the block rotor for the 1107 * specified cylinder group. 1108 * Note that this routine only allocates fs_bsize blocks; these 1109 * blocks may be fragmented by the routine that allocates them. 1110 */ 1111 static ufs_daddr_t 1112 ffs_alloccgblk(struct inode *ip, struct buf *bp, ufs_daddr_t bpref) 1113 { 1114 struct fs *fs; 1115 struct cg *cgp; 1116 ufs_daddr_t bno, blkno; 1117 int cylno, pos, delta; 1118 short *cylbp; 1119 int i; 1120 uint8_t *blksfree; 1121 1122 fs = ip->i_fs; 1123 cgp = (struct cg *)bp->b_data; 1124 blksfree = cg_blksfree(cgp); 1125 if (bpref == 0 || dtog(fs, bpref) != cgp->cg_cgx) { 1126 bpref = cgp->cg_rotor; 1127 goto norot; 1128 } 1129 bpref = blknum(fs, bpref); 1130 bpref = dtogd(fs, bpref); 1131 /* 1132 * if the requested block is available, use it 1133 */ 1134 if (ffs_isblock(fs, blksfree, fragstoblks(fs, bpref))) { 1135 bno = bpref; 1136 goto gotit; 1137 } 1138 if (fs->fs_nrpos <= 1 || fs->fs_cpc == 0) { 1139 /* 1140 * Block layout information is not available. 1141 * Leaving bpref unchanged means we take the 1142 * next available free block following the one 1143 * we just allocated. Hopefully this will at 1144 * least hit a track cache on drives of unknown 1145 * geometry (e.g. SCSI). 1146 */ 1147 goto norot; 1148 } 1149 /* 1150 * check for a block available on the same cylinder 1151 */ 1152 cylno = cbtocylno(fs, bpref); 1153 if (cg_blktot(cgp)[cylno] == 0) 1154 goto norot; 1155 /* 1156 * check the summary information to see if a block is 1157 * available in the requested cylinder starting at the 1158 * requested rotational position and proceeding around. 1159 */ 1160 cylbp = cg_blks(fs, cgp, cylno); 1161 pos = cbtorpos(fs, bpref); 1162 for (i = pos; i < fs->fs_nrpos; i++) 1163 if (cylbp[i] > 0) 1164 break; 1165 if (i == fs->fs_nrpos) 1166 for (i = 0; i < pos; i++) 1167 if (cylbp[i] > 0) 1168 break; 1169 if (cylbp[i] > 0) { 1170 /* 1171 * found a rotational position, now find the actual 1172 * block. A panic if none is actually there. 1173 */ 1174 pos = cylno % fs->fs_cpc; 1175 bno = (cylno - pos) * fs->fs_spc / NSPB(fs); 1176 if (fs_postbl(fs, pos)[i] == -1) { 1177 kprintf("pos = %d, i = %d, fs = %s\n", 1178 pos, i, fs->fs_fsmnt); 1179 panic("ffs_alloccgblk: cyl groups corrupted"); 1180 } 1181 for (i = fs_postbl(fs, pos)[i];; ) { 1182 if (ffs_isblock(fs, blksfree, bno + i)) { 1183 bno = blkstofrags(fs, (bno + i)); 1184 goto gotit; 1185 } 1186 delta = fs_rotbl(fs)[i]; 1187 if (delta <= 0 || 1188 delta + i > fragstoblks(fs, fs->fs_fpg)) 1189 break; 1190 i += delta; 1191 } 1192 kprintf("pos = %d, i = %d, fs = %s\n", pos, i, fs->fs_fsmnt); 1193 panic("ffs_alloccgblk: can't find blk in cyl"); 1194 } 1195 norot: 1196 /* 1197 * no blocks in the requested cylinder, so take next 1198 * available one in this cylinder group. 1199 */ 1200 bno = ffs_mapsearch(fs, cgp, bpref, (int)fs->fs_frag); 1201 if (bno < 0) 1202 return (0); 1203 cgp->cg_rotor = bno; 1204 gotit: 1205 blkno = fragstoblks(fs, bno); 1206 ffs_clrblock(fs, blksfree, (long)blkno); 1207 ffs_clusteracct(fs, cgp, blkno, -1); 1208 cgp->cg_cs.cs_nbfree--; 1209 fs->fs_cstotal.cs_nbfree--; 1210 fs->fs_cs(fs, cgp->cg_cgx).cs_nbfree--; 1211 cylno = cbtocylno(fs, bno); 1212 cg_blks(fs, cgp, cylno)[cbtorpos(fs, bno)]--; 1213 cg_blktot(cgp)[cylno]--; 1214 fs->fs_fmod = 1; 1215 blkno = cgp->cg_cgx * fs->fs_fpg + bno; 1216 if (DOINGSOFTDEP(ITOV(ip))) 1217 softdep_setup_blkmapdep(bp, fs, blkno); 1218 return (blkno); 1219 } 1220 1221 /* 1222 * Determine whether a cluster can be allocated. 1223 * 1224 * We do not currently check for optimal rotational layout if there 1225 * are multiple choices in the same cylinder group. Instead we just 1226 * take the first one that we find following bpref. 1227 */ 1228 static ufs_daddr_t 1229 ffs_clusteralloc(struct inode *ip, int cg, ufs_daddr_t bpref, int len) 1230 { 1231 struct fs *fs; 1232 struct cg *cgp; 1233 struct buf *bp; 1234 int i, got, run, bno, bit, map; 1235 u_char *mapp; 1236 int32_t *lp; 1237 uint8_t *blksfree; 1238 1239 fs = ip->i_fs; 1240 if (fs->fs_maxcluster[cg] < len) 1241 return (0); 1242 if (bread(ip->i_devvp, fsbtodoff(fs, cgtod(fs, cg)), 1243 (int)fs->fs_cgsize, &bp)) { 1244 goto fail; 1245 } 1246 cgp = (struct cg *)bp->b_data; 1247 if (!cg_chkmagic(cgp)) 1248 goto fail; 1249 1250 /* 1251 * Check to see if a cluster of the needed size (or bigger) is 1252 * available in this cylinder group. 1253 */ 1254 lp = &cg_clustersum(cgp)[len]; 1255 for (i = len; i <= fs->fs_contigsumsize; i++) 1256 if (*lp++ > 0) 1257 break; 1258 if (i > fs->fs_contigsumsize) { 1259 /* 1260 * This is the first time looking for a cluster in this 1261 * cylinder group. Update the cluster summary information 1262 * to reflect the true maximum sized cluster so that 1263 * future cluster allocation requests can avoid reading 1264 * the cylinder group map only to find no clusters. 1265 */ 1266 lp = &cg_clustersum(cgp)[len - 1]; 1267 for (i = len - 1; i > 0; i--) 1268 if (*lp-- > 0) 1269 break; 1270 fs->fs_maxcluster[cg] = i; 1271 goto fail; 1272 } 1273 /* 1274 * Search the cluster map to find a big enough cluster. 1275 * We take the first one that we find, even if it is larger 1276 * than we need as we prefer to get one close to the previous 1277 * block allocation. We do not search before the current 1278 * preference point as we do not want to allocate a block 1279 * that is allocated before the previous one (as we will 1280 * then have to wait for another pass of the elevator 1281 * algorithm before it will be read). We prefer to fail and 1282 * be recalled to try an allocation in the next cylinder group. 1283 */ 1284 if (dtog(fs, bpref) != cg) 1285 bpref = 0; 1286 else 1287 bpref = fragstoblks(fs, dtogd(fs, blknum(fs, bpref))); 1288 mapp = &cg_clustersfree(cgp)[bpref / NBBY]; 1289 map = *mapp++; 1290 bit = 1 << (bpref % NBBY); 1291 for (run = 0, got = bpref; got < cgp->cg_nclusterblks; got++) { 1292 if ((map & bit) == 0) { 1293 run = 0; 1294 } else { 1295 run++; 1296 if (run == len) 1297 break; 1298 } 1299 if ((got & (NBBY - 1)) != (NBBY - 1)) { 1300 bit <<= 1; 1301 } else { 1302 map = *mapp++; 1303 bit = 1; 1304 } 1305 } 1306 if (got >= cgp->cg_nclusterblks) 1307 goto fail; 1308 /* 1309 * Allocate the cluster that we have found. 1310 */ 1311 blksfree = cg_blksfree(cgp); 1312 for (i = 1; i <= len; i++) { 1313 if (!ffs_isblock(fs, blksfree, got - run + i)) 1314 panic("ffs_clusteralloc: map mismatch"); 1315 } 1316 bno = cg * fs->fs_fpg + blkstofrags(fs, got - run + 1); 1317 if (dtog(fs, bno) != cg) 1318 panic("ffs_clusteralloc: allocated out of group"); 1319 len = blkstofrags(fs, len); 1320 for (i = 0; i < len; i += fs->fs_frag) { 1321 if ((got = ffs_alloccgblk(ip, bp, bno + i)) != bno + i) 1322 panic("ffs_clusteralloc: lost block"); 1323 } 1324 bdwrite(bp); 1325 return (bno); 1326 1327 fail: 1328 brelse(bp); 1329 return (0); 1330 } 1331 1332 /* 1333 * Determine whether an inode can be allocated. 1334 * 1335 * Check to see if an inode is available, and if it is, 1336 * allocate it using the following policy: 1337 * 1) allocate the requested inode. 1338 * 2) allocate the next available inode after the requested 1339 * inode in the specified cylinder group. 1340 * 3) the inode must not already be in the inode hash table. We 1341 * can encounter such a case because the vnode reclamation sequence 1342 * frees the bit 1343 * 3) the inode must not already be in the inode hash, otherwise it 1344 * may be in the process of being deallocated. This can occur 1345 * because the bitmap is updated before the inode is removed from 1346 * hash. If we were to reallocate the inode the caller could wind 1347 * up returning a vnode/inode combination which is in an indeterminate 1348 * state. 1349 */ 1350 static ino_t 1351 ffs_nodealloccg(struct inode *ip, int cg, ufs_daddr_t ipref, int mode) 1352 { 1353 struct ufsmount *ump; 1354 struct fs *fs; 1355 struct cg *cgp; 1356 struct buf *bp; 1357 uint8_t *inosused; 1358 uint8_t map; 1359 int error, len, arraysize, i; 1360 int icheckmiss; 1361 ufs_daddr_t ibase; 1362 struct vnode *vp; 1363 1364 vp = ITOV(ip); 1365 ump = VFSTOUFS(vp->v_mount); 1366 fs = ip->i_fs; 1367 if (fs->fs_cs(fs, cg).cs_nifree == 0) 1368 return (0); 1369 error = bread(ip->i_devvp, fsbtodoff(fs, cgtod(fs, cg)), 1370 (int)fs->fs_cgsize, &bp); 1371 if (error) { 1372 brelse(bp); 1373 return (0); 1374 } 1375 cgp = (struct cg *)bp->b_data; 1376 if (!cg_chkmagic(cgp) || cgp->cg_cs.cs_nifree == 0) { 1377 brelse(bp); 1378 return (0); 1379 } 1380 inosused = cg_inosused(cgp); 1381 icheckmiss = 0; 1382 1383 /* 1384 * Quick check, reuse the most recently free inode or continue 1385 * a scan from where we left off the last time. 1386 */ 1387 ibase = cg * fs->fs_ipg; 1388 if (ipref) { 1389 ipref %= fs->fs_ipg; 1390 if (isclr(inosused, ipref)) { 1391 if (ufs_ihashcheck(ump, ip->i_dev, ibase + ipref) == 0) 1392 goto gotit; 1393 } 1394 } 1395 1396 /* 1397 * Scan the inode bitmap starting at irotor, be sure to handle 1398 * the edge case by going back to the beginning of the array. 1399 * 1400 * If the number of inodes is not byte-aligned, the unused bits 1401 * should be set to 1. This will be sanity checked in gotit. Note 1402 * that we have to be sure not to overlap the beginning and end 1403 * when irotor is in the middle of a byte as this will cause the 1404 * same bitmap byte to be checked twice. To solve this problem we 1405 * just convert everything to a byte index for the loop. 1406 */ 1407 ipref = (cgp->cg_irotor % fs->fs_ipg) >> 3; /* byte index */ 1408 len = (fs->fs_ipg + 7) >> 3; /* byte size */ 1409 arraysize = len; 1410 1411 while (len > 0) { 1412 map = inosused[ipref]; 1413 if (map != 255) { 1414 for (i = 0; i < NBBY; ++i) { 1415 /* 1416 * If we find a free bit we have to make sure 1417 * that the inode is not in the middle of 1418 * being destroyed. The inode should not exist 1419 * in the inode hash. 1420 * 1421 * Adjust the rotor to try to hit the 1422 * quick-check up above. 1423 */ 1424 if ((map & (1 << i)) == 0) { 1425 if (ufs_ihashcheck(ump, ip->i_dev, ibase + (ipref << 3) + i) == 0) { 1426 ipref = (ipref << 3) + i; 1427 cgp->cg_irotor = (ipref + 1) % fs->fs_ipg; 1428 goto gotit; 1429 } 1430 ++icheckmiss; 1431 } 1432 } 1433 } 1434 1435 /* 1436 * Setup for the next byte, start at the beginning again if 1437 * we hit the end of the array. 1438 */ 1439 if (++ipref == arraysize) 1440 ipref = 0; 1441 --len; 1442 } 1443 if (icheckmiss == cgp->cg_cs.cs_nifree) { 1444 brelse(bp); 1445 return(0); 1446 } 1447 kprintf("fs = %s\n", fs->fs_fsmnt); 1448 panic("ffs_nodealloccg: block not in map, icheckmiss/nfree %d/%d", 1449 icheckmiss, cgp->cg_cs.cs_nifree); 1450 /* NOTREACHED */ 1451 1452 /* 1453 * ipref is a bit index as of the gotit label. 1454 */ 1455 gotit: 1456 KKASSERT(ipref >= 0 && ipref < fs->fs_ipg); 1457 cgp->cg_time = time_second; 1458 if (DOINGSOFTDEP(ITOV(ip))) 1459 softdep_setup_inomapdep(bp, ip, ibase + ipref); 1460 setbit(inosused, ipref); 1461 cgp->cg_cs.cs_nifree--; 1462 fs->fs_cstotal.cs_nifree--; 1463 fs->fs_cs(fs, cg).cs_nifree--; 1464 fs->fs_fmod = 1; 1465 if ((mode & IFMT) == IFDIR) { 1466 cgp->cg_cs.cs_ndir++; 1467 fs->fs_cstotal.cs_ndir++; 1468 fs->fs_cs(fs, cg).cs_ndir++; 1469 } 1470 bdwrite(bp); 1471 return (ibase + ipref); 1472 } 1473 1474 /* 1475 * Free a block or fragment. 1476 * 1477 * The specified block or fragment is placed back in the 1478 * free map. If a fragment is deallocated, a possible 1479 * block reassembly is checked. 1480 */ 1481 void 1482 ffs_blkfree_cg(struct fs * fs, struct vnode * i_devvp, cdev_t i_dev, ino_t i_number, 1483 uint32_t i_din_uid, ufs_daddr_t bno, long size) 1484 { 1485 struct cg *cgp; 1486 struct buf *bp; 1487 ufs_daddr_t blkno; 1488 int i, error, cg, blk, frags, bbase; 1489 uint8_t *blksfree; 1490 1491 VOP_FREEBLKS(i_devvp, fsbtodoff(fs, bno), size); 1492 if ((uint)size > fs->fs_bsize || fragoff(fs, size) != 0 || 1493 fragnum(fs, bno) + numfrags(fs, size) > fs->fs_frag) { 1494 kprintf("dev=%s, bno = %ld, bsize = %ld, size = %ld, fs = %s\n", 1495 devtoname(i_dev), (long)bno, (long)fs->fs_bsize, size, 1496 fs->fs_fsmnt); 1497 panic("ffs_blkfree: bad size"); 1498 } 1499 cg = dtog(fs, bno); 1500 if ((uint)bno >= fs->fs_size) { 1501 kprintf("bad block %ld, ino %lu\n", 1502 (long)bno, (u_long)i_number); 1503 ffs_fserr(fs, i_din_uid, "bad block"); 1504 return; 1505 } 1506 1507 /* 1508 * Load the cylinder group 1509 */ 1510 error = bread(i_devvp, fsbtodoff(fs, cgtod(fs, cg)), 1511 (int)fs->fs_cgsize, &bp); 1512 if (error) { 1513 brelse(bp); 1514 return; 1515 } 1516 cgp = (struct cg *)bp->b_data; 1517 if (!cg_chkmagic(cgp)) { 1518 brelse(bp); 1519 return; 1520 } 1521 cgp->cg_time = time_second; 1522 bno = dtogd(fs, bno); 1523 blksfree = cg_blksfree(cgp); 1524 1525 if (size == fs->fs_bsize) { 1526 /* 1527 * Free a whole block 1528 */ 1529 blkno = fragstoblks(fs, bno); 1530 if (!ffs_isfreeblock(fs, blksfree, blkno)) { 1531 kprintf("dev = %s, block = %ld, fs = %s\n", 1532 devtoname(i_dev), (long)bno, fs->fs_fsmnt); 1533 panic("ffs_blkfree: freeing free block"); 1534 } 1535 ffs_setblock(fs, blksfree, blkno); 1536 ffs_clusteracct(fs, cgp, blkno, 1); 1537 cgp->cg_cs.cs_nbfree++; 1538 fs->fs_cstotal.cs_nbfree++; 1539 fs->fs_cs(fs, cg).cs_nbfree++; 1540 i = cbtocylno(fs, bno); 1541 cg_blks(fs, cgp, i)[cbtorpos(fs, bno)]++; 1542 cg_blktot(cgp)[i]++; 1543 } else { 1544 /* 1545 * Free a fragment within a block. 1546 * 1547 * bno is the starting block number of the fragment being 1548 * freed. 1549 * 1550 * bbase is the starting block number for the filesystem 1551 * block containing the fragment. 1552 * 1553 * blk is the current bitmap for the fragments within the 1554 * filesystem block containing the fragment. 1555 * 1556 * frags is the number of fragments being freed 1557 * 1558 * Call ffs_fragacct() to account for the removal of all 1559 * current fragments, then adjust the bitmap to free the 1560 * requested fragment, and finally call ffs_fragacct() again 1561 * to regenerate the accounting. 1562 */ 1563 bbase = bno - fragnum(fs, bno); 1564 blk = blkmap(fs, blksfree, bbase); 1565 ffs_fragacct(fs, blk, cgp->cg_frsum, -1); 1566 frags = numfrags(fs, size); 1567 for (i = 0; i < frags; i++) { 1568 if (isset(blksfree, bno + i)) { 1569 kprintf("dev = %s, block = %ld, fs = %s\n", 1570 devtoname(i_dev), (long)(bno + i), 1571 fs->fs_fsmnt); 1572 panic("ffs_blkfree: freeing free frag"); 1573 } 1574 setbit(blksfree, bno + i); 1575 } 1576 cgp->cg_cs.cs_nffree += i; 1577 fs->fs_cstotal.cs_nffree += i; 1578 fs->fs_cs(fs, cg).cs_nffree += i; 1579 1580 /* 1581 * Add back in counts associated with the new frags 1582 */ 1583 blk = blkmap(fs, blksfree, bbase); 1584 ffs_fragacct(fs, blk, cgp->cg_frsum, 1); 1585 1586 /* 1587 * If a complete block has been reassembled, account for it 1588 */ 1589 blkno = fragstoblks(fs, bbase); 1590 if (ffs_isblock(fs, blksfree, blkno)) { 1591 cgp->cg_cs.cs_nffree -= fs->fs_frag; 1592 fs->fs_cstotal.cs_nffree -= fs->fs_frag; 1593 fs->fs_cs(fs, cg).cs_nffree -= fs->fs_frag; 1594 ffs_clusteracct(fs, cgp, blkno, 1); 1595 cgp->cg_cs.cs_nbfree++; 1596 fs->fs_cstotal.cs_nbfree++; 1597 fs->fs_cs(fs, cg).cs_nbfree++; 1598 i = cbtocylno(fs, bbase); 1599 cg_blks(fs, cgp, i)[cbtorpos(fs, bbase)]++; 1600 cg_blktot(cgp)[i]++; 1601 } 1602 } 1603 fs->fs_fmod = 1; 1604 bdwrite(bp); 1605 } 1606 1607 struct ffs_blkfree_trim_params { 1608 struct task task; 1609 ufs_daddr_t bno; 1610 long size; 1611 1612 /* 1613 * With TRIM, inode pointer is gone in the callback but we still need 1614 * the following fields for ffs_blkfree_cg() 1615 */ 1616 struct vnode *i_devvp; 1617 struct fs *i_fs; 1618 cdev_t i_dev; 1619 ino_t i_number; 1620 uint32_t i_din_uid; 1621 }; 1622 1623 1624 static void 1625 ffs_blkfree_trim_task(void *ctx, int pending) 1626 { 1627 struct ffs_blkfree_trim_params *tp; 1628 1629 tp = ctx; 1630 ffs_blkfree_cg(tp->i_fs, tp->i_devvp, tp->i_dev, tp->i_number, 1631 tp->i_din_uid, tp->bno, tp->size); 1632 kfree(tp, M_TEMP); 1633 } 1634 1635 1636 1637 static void 1638 ffs_blkfree_trim_completed(struct bio *biop) 1639 { 1640 struct buf *bp = biop->bio_buf; 1641 struct ffs_blkfree_trim_params *tp; 1642 1643 tp = bp->b_bio1.bio_caller_info1.ptr; 1644 TASK_INIT(&tp->task, 0, ffs_blkfree_trim_task, tp); 1645 tp = biop->bio_caller_info1.ptr; 1646 taskqueue_enqueue(taskqueue_swi, &tp->task); 1647 biodone(biop); 1648 } 1649 1650 1651 /* 1652 * If TRIM is enabled, we TRIM the blocks first then free them. We do this 1653 * after TRIM is finished and the callback handler is called. The logic here 1654 * is that we free the blocks before updating the bitmap so that we don't 1655 * reuse a block before we actually trim it, which would result in trimming 1656 * a valid block. 1657 */ 1658 void 1659 ffs_blkfree(struct inode *ip, ufs_daddr_t bno, long size) 1660 { 1661 struct mount *mp = ip->i_devvp->v_mount; 1662 struct ffs_blkfree_trim_params *tp; 1663 1664 if (!(mp->mnt_flag & MNT_TRIM)) { 1665 ffs_blkfree_cg(ip->i_fs, ip->i_devvp,ip->i_dev,ip->i_number, 1666 ip->i_uid, bno, size); 1667 return; 1668 } 1669 1670 struct buf *bp; 1671 1672 tp = kmalloc(sizeof(struct ffs_blkfree_trim_params), M_TEMP, M_WAITOK); 1673 tp->bno = bno; 1674 tp->i_fs= ip->i_fs; 1675 tp->i_devvp = ip->i_devvp; 1676 tp->i_dev = ip->i_dev; 1677 tp->i_din_uid = ip->i_uid; 1678 tp->i_number = ip->i_number; 1679 tp->size = size; 1680 1681 bp = getnewbuf(0,0,0,1); 1682 BUF_KERNPROC(bp); 1683 bp->b_cmd = BUF_CMD_FREEBLKS; 1684 bp->b_bio1.bio_offset = fsbtodoff(ip->i_fs, bno); 1685 bp->b_bcount = size; 1686 bp->b_bio1.bio_caller_info1.ptr = tp; 1687 bp->b_bio1.bio_done = ffs_blkfree_trim_completed; 1688 vn_strategy(ip->i_devvp, &bp->b_bio1); 1689 } 1690 1691 #ifdef DIAGNOSTIC 1692 /* 1693 * Verify allocation of a block or fragment. Returns true if block or 1694 * fragment is allocated, false if it is free. 1695 */ 1696 static int 1697 ffs_checkblk(struct inode *ip, ufs_daddr_t bno, long size) 1698 { 1699 struct fs *fs; 1700 struct cg *cgp; 1701 struct buf *bp; 1702 int i, error, frags, free; 1703 uint8_t *blksfree; 1704 1705 fs = ip->i_fs; 1706 if ((uint)size > fs->fs_bsize || fragoff(fs, size) != 0) { 1707 kprintf("bsize = %ld, size = %ld, fs = %s\n", 1708 (long)fs->fs_bsize, size, fs->fs_fsmnt); 1709 panic("ffs_checkblk: bad size"); 1710 } 1711 if ((uint)bno >= fs->fs_size) 1712 panic("ffs_checkblk: bad block %d", bno); 1713 error = bread(ip->i_devvp, fsbtodoff(fs, cgtod(fs, dtog(fs, bno))), 1714 (int)fs->fs_cgsize, &bp); 1715 if (error) 1716 panic("ffs_checkblk: cg bread failed"); 1717 cgp = (struct cg *)bp->b_data; 1718 if (!cg_chkmagic(cgp)) 1719 panic("ffs_checkblk: cg magic mismatch"); 1720 blksfree = cg_blksfree(cgp); 1721 bno = dtogd(fs, bno); 1722 if (size == fs->fs_bsize) { 1723 free = ffs_isblock(fs, blksfree, fragstoblks(fs, bno)); 1724 } else { 1725 frags = numfrags(fs, size); 1726 for (free = 0, i = 0; i < frags; i++) 1727 if (isset(blksfree, bno + i)) 1728 free++; 1729 if (free != 0 && free != frags) 1730 panic("ffs_checkblk: partially free fragment"); 1731 } 1732 brelse(bp); 1733 return (!free); 1734 } 1735 #endif /* DIAGNOSTIC */ 1736 1737 /* 1738 * Free an inode. 1739 */ 1740 int 1741 ffs_vfree(struct vnode *pvp, ino_t ino, int mode) 1742 { 1743 if (DOINGSOFTDEP(pvp)) { 1744 softdep_freefile(pvp, ino, mode); 1745 return (0); 1746 } 1747 return (ffs_freefile(pvp, ino, mode)); 1748 } 1749 1750 /* 1751 * Do the actual free operation. 1752 * The specified inode is placed back in the free map. 1753 */ 1754 int 1755 ffs_freefile(struct vnode *pvp, ino_t ino, int mode) 1756 { 1757 struct fs *fs; 1758 struct cg *cgp; 1759 struct inode *pip; 1760 struct buf *bp; 1761 int error, cg; 1762 uint8_t *inosused; 1763 1764 pip = VTOI(pvp); 1765 fs = pip->i_fs; 1766 if ((uint)ino >= fs->fs_ipg * fs->fs_ncg) 1767 panic("ffs_vfree: range: dev = (%d,%d), ino = %"PRId64", fs = %s", 1768 major(pip->i_dev), minor(pip->i_dev), ino, fs->fs_fsmnt); 1769 cg = ino_to_cg(fs, ino); 1770 error = bread(pip->i_devvp, fsbtodoff(fs, cgtod(fs, cg)), 1771 (int)fs->fs_cgsize, &bp); 1772 if (error) { 1773 brelse(bp); 1774 return (error); 1775 } 1776 cgp = (struct cg *)bp->b_data; 1777 if (!cg_chkmagic(cgp)) { 1778 brelse(bp); 1779 return (0); 1780 } 1781 cgp->cg_time = time_second; 1782 inosused = cg_inosused(cgp); 1783 ino %= fs->fs_ipg; 1784 if (isclr(inosused, ino)) { 1785 kprintf("dev = %s, ino = %lu, fs = %s\n", 1786 devtoname(pip->i_dev), (u_long)ino, fs->fs_fsmnt); 1787 if (fs->fs_ronly == 0) 1788 panic("ffs_vfree: freeing free inode"); 1789 } 1790 clrbit(inosused, ino); 1791 if (ino < cgp->cg_irotor) 1792 cgp->cg_irotor = ino; 1793 cgp->cg_cs.cs_nifree++; 1794 fs->fs_cstotal.cs_nifree++; 1795 fs->fs_cs(fs, cg).cs_nifree++; 1796 if ((mode & IFMT) == IFDIR) { 1797 cgp->cg_cs.cs_ndir--; 1798 fs->fs_cstotal.cs_ndir--; 1799 fs->fs_cs(fs, cg).cs_ndir--; 1800 } 1801 fs->fs_fmod = 1; 1802 bdwrite(bp); 1803 return (0); 1804 } 1805 1806 /* 1807 * Find a block of the specified size in the specified cylinder group. 1808 * 1809 * It is a panic if a request is made to find a block if none are 1810 * available. 1811 */ 1812 static ufs_daddr_t 1813 ffs_mapsearch(struct fs *fs, struct cg *cgp, ufs_daddr_t bpref, int allocsiz) 1814 { 1815 ufs_daddr_t bno; 1816 int start, len, loc, i; 1817 int blk, field, subfield, pos; 1818 uint8_t *blksfree; 1819 1820 /* 1821 * find the fragment by searching through the free block 1822 * map for an appropriate bit pattern. 1823 */ 1824 if (bpref) 1825 start = dtogd(fs, bpref) / NBBY; 1826 else 1827 start = cgp->cg_frotor / NBBY; 1828 blksfree = cg_blksfree(cgp); 1829 len = howmany(fs->fs_fpg, NBBY) - start; 1830 loc = scanc((uint)len, (u_char *)&blksfree[start], 1831 (u_char *)fragtbl[fs->fs_frag], 1832 (u_char)(1 << (allocsiz - 1 + (fs->fs_frag % NBBY)))); 1833 if (loc == 0) { 1834 len = start + 1; /* XXX why overlap here? */ 1835 start = 0; 1836 loc = scanc((uint)len, (u_char *)&blksfree[0], 1837 (u_char *)fragtbl[fs->fs_frag], 1838 (u_char)(1 << (allocsiz - 1 + (fs->fs_frag % NBBY)))); 1839 if (loc == 0) { 1840 kprintf("start = %d, len = %d, fs = %s\n", 1841 start, len, fs->fs_fsmnt); 1842 panic("ffs_alloccg: map corrupted"); 1843 /* NOTREACHED */ 1844 } 1845 } 1846 bno = (start + len - loc) * NBBY; 1847 cgp->cg_frotor = bno; 1848 /* 1849 * found the byte in the map 1850 * sift through the bits to find the selected frag 1851 */ 1852 for (i = bno + NBBY; bno < i; bno += fs->fs_frag) { 1853 blk = blkmap(fs, blksfree, bno); 1854 blk <<= 1; 1855 field = around[allocsiz]; 1856 subfield = inside[allocsiz]; 1857 for (pos = 0; pos <= fs->fs_frag - allocsiz; pos++) { 1858 if ((blk & field) == subfield) 1859 return (bno + pos); 1860 field <<= 1; 1861 subfield <<= 1; 1862 } 1863 } 1864 kprintf("bno = %lu, fs = %s\n", (u_long)bno, fs->fs_fsmnt); 1865 panic("ffs_alloccg: block not in map"); 1866 return (-1); 1867 } 1868 1869 /* 1870 * Update the cluster map because of an allocation or free. 1871 * 1872 * Cnt == 1 means free; cnt == -1 means allocating. 1873 */ 1874 static void 1875 ffs_clusteracct(struct fs *fs, struct cg *cgp, ufs_daddr_t blkno, int cnt) 1876 { 1877 int32_t *sump; 1878 int32_t *lp; 1879 u_char *freemapp, *mapp; 1880 int i, start, end, forw, back, map, bit; 1881 1882 if (fs->fs_contigsumsize <= 0) 1883 return; 1884 freemapp = cg_clustersfree(cgp); 1885 sump = cg_clustersum(cgp); 1886 /* 1887 * Allocate or clear the actual block. 1888 */ 1889 if (cnt > 0) 1890 setbit(freemapp, blkno); 1891 else 1892 clrbit(freemapp, blkno); 1893 /* 1894 * Find the size of the cluster going forward. 1895 */ 1896 start = blkno + 1; 1897 end = start + fs->fs_contigsumsize; 1898 if (end >= cgp->cg_nclusterblks) 1899 end = cgp->cg_nclusterblks; 1900 mapp = &freemapp[start / NBBY]; 1901 map = *mapp++; 1902 bit = 1 << (start % NBBY); 1903 for (i = start; i < end; i++) { 1904 if ((map & bit) == 0) 1905 break; 1906 if ((i & (NBBY - 1)) != (NBBY - 1)) { 1907 bit <<= 1; 1908 } else { 1909 map = *mapp++; 1910 bit = 1; 1911 } 1912 } 1913 forw = i - start; 1914 /* 1915 * Find the size of the cluster going backward. 1916 */ 1917 start = blkno - 1; 1918 end = start - fs->fs_contigsumsize; 1919 if (end < 0) 1920 end = -1; 1921 mapp = &freemapp[start / NBBY]; 1922 map = *mapp--; 1923 bit = 1 << (start % NBBY); 1924 for (i = start; i > end; i--) { 1925 if ((map & bit) == 0) 1926 break; 1927 if ((i & (NBBY - 1)) != 0) { 1928 bit >>= 1; 1929 } else { 1930 map = *mapp--; 1931 bit = 1 << (NBBY - 1); 1932 } 1933 } 1934 back = start - i; 1935 /* 1936 * Account for old cluster and the possibly new forward and 1937 * back clusters. 1938 */ 1939 i = back + forw + 1; 1940 if (i > fs->fs_contigsumsize) 1941 i = fs->fs_contigsumsize; 1942 sump[i] += cnt; 1943 if (back > 0) 1944 sump[back] -= cnt; 1945 if (forw > 0) 1946 sump[forw] -= cnt; 1947 /* 1948 * Update cluster summary information. 1949 */ 1950 lp = &sump[fs->fs_contigsumsize]; 1951 for (i = fs->fs_contigsumsize; i > 0; i--) 1952 if (*lp-- > 0) 1953 break; 1954 fs->fs_maxcluster[cgp->cg_cgx] = i; 1955 } 1956 1957 /* 1958 * Fserr prints the name of a filesystem with an error diagnostic. 1959 * 1960 * The form of the error message is: 1961 * fs: error message 1962 */ 1963 static void 1964 ffs_fserr(struct fs *fs, uint uid, char *cp) 1965 { 1966 struct thread *td = curthread; 1967 struct proc *p; 1968 1969 if ((p = td->td_proc) != NULL) { 1970 log(LOG_ERR, "pid %d (%s), uid %d on %s: %s\n", p ? p->p_pid : -1, 1971 p ? p->p_comm : "-", uid, fs->fs_fsmnt, cp); 1972 } else { 1973 log(LOG_ERR, "system thread %p, uid %d on %s: %s\n", 1974 td, uid, fs->fs_fsmnt, cp); 1975 } 1976 } 1977