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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ffs_inode.c 8.13 (Berkeley) 4/21/95 34 * $FreeBSD$ 35 */ 36 37 #include "opt_quota.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mount.h> 42 #include <sys/proc.h> 43 #include <sys/bio.h> 44 #include <sys/buf.h> 45 #include <sys/vnode.h> 46 #include <sys/malloc.h> 47 #include <sys/resourcevar.h> 48 #include <sys/vmmeter.h> 49 #include <sys/stat.h> 50 51 #include <vm/vm.h> 52 #include <vm/vm_extern.h> 53 54 #include <ufs/ufs/extattr.h> 55 #include <ufs/ufs/quota.h> 56 #include <ufs/ufs/ufsmount.h> 57 #include <ufs/ufs/inode.h> 58 #include <ufs/ufs/ufs_extern.h> 59 60 #include <ufs/ffs/fs.h> 61 #include <ufs/ffs/ffs_extern.h> 62 63 static int ffs_indirtrunc __P((struct inode *, ufs_daddr_t, ufs_daddr_t, 64 ufs_daddr_t, int, long *)); 65 66 /* 67 * Update the access, modified, and inode change times as specified by the 68 * IN_ACCESS, IN_UPDATE, and IN_CHANGE flags respectively. Write the inode 69 * to disk if the IN_MODIFIED flag is set (it may be set initially, or by 70 * the timestamp update). The IN_LAZYMOD flag is set to force a write 71 * later if not now. If we write now, then clear both IN_MODIFIED and 72 * IN_LAZYMOD to reflect the presumably successful write, and if waitfor is 73 * set, then wait for the write to complete. 74 */ 75 int 76 ffs_update(vp, waitfor) 77 struct vnode *vp; 78 int waitfor; 79 { 80 register struct fs *fs; 81 struct buf *bp; 82 struct inode *ip; 83 int error; 84 85 ufs_itimes(vp); 86 ip = VTOI(vp); 87 if ((ip->i_flag & IN_MODIFIED) == 0 && waitfor == 0) 88 return (0); 89 ip->i_flag &= ~(IN_LAZYMOD | IN_MODIFIED); 90 if (vp->v_mount->mnt_flag & MNT_RDONLY) 91 return (0); 92 fs = ip->i_fs; 93 /* 94 * Ensure that uid and gid are correct. This is a temporary 95 * fix until fsck has been changed to do the update. 96 */ 97 if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */ 98 ip->i_din.di_ouid = ip->i_uid; /* XXX */ 99 ip->i_din.di_ogid = ip->i_gid; /* XXX */ 100 } /* XXX */ 101 error = bread(ip->i_devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 102 (int)fs->fs_bsize, NOCRED, &bp); 103 if (error) { 104 brelse(bp); 105 return (error); 106 } 107 if (DOINGSOFTDEP(vp)) 108 softdep_update_inodeblock(ip, bp, waitfor); 109 else if (ip->i_effnlink != ip->i_nlink) 110 panic("ffs_update: bad link cnt"); 111 *((struct dinode *)bp->b_data + 112 ino_to_fsbo(fs, ip->i_number)) = ip->i_din; 113 if (waitfor && !DOINGASYNC(vp)) { 114 return (bwrite(bp)); 115 } else if (vm_page_count_severe() || buf_dirty_count_severe()) { 116 return (bwrite(bp)); 117 } else { 118 if (bp->b_bufsize == fs->fs_bsize) 119 bp->b_flags |= B_CLUSTEROK; 120 bdwrite(bp); 121 return (0); 122 } 123 } 124 125 #define SINGLE 0 /* index of single indirect block */ 126 #define DOUBLE 1 /* index of double indirect block */ 127 #define TRIPLE 2 /* index of triple indirect block */ 128 /* 129 * Truncate the inode oip to at most length size, freeing the 130 * disk blocks. 131 */ 132 int 133 ffs_truncate(vp, length, flags, cred, p) 134 struct vnode *vp; 135 off_t length; 136 int flags; 137 struct ucred *cred; 138 struct proc *p; 139 { 140 register struct vnode *ovp = vp; 141 ufs_daddr_t lastblock; 142 register struct inode *oip; 143 ufs_daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR]; 144 ufs_daddr_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR]; 145 register struct fs *fs; 146 struct buf *bp; 147 int offset, size, level; 148 long count, nblocks, blocksreleased = 0; 149 register int i; 150 int aflags, error, allerror; 151 off_t osize; 152 153 oip = VTOI(ovp); 154 fs = oip->i_fs; 155 if (length < 0) 156 return (EINVAL); 157 if (length > fs->fs_maxfilesize) 158 return (EFBIG); 159 if (ovp->v_type == VLNK && 160 (oip->i_size < ovp->v_mount->mnt_maxsymlinklen || oip->i_din.di_blocks == 0)) { 161 #ifdef DIAGNOSTIC 162 if (length != 0) 163 panic("ffs_truncate: partial truncate of symlink"); 164 #endif 165 bzero((char *)&oip->i_shortlink, (u_int)oip->i_size); 166 oip->i_size = 0; 167 oip->i_flag |= IN_CHANGE | IN_UPDATE; 168 return (UFS_UPDATE(ovp, 1)); 169 } 170 if (oip->i_size == length) { 171 oip->i_flag |= IN_CHANGE | IN_UPDATE; 172 return (UFS_UPDATE(ovp, 0)); 173 } 174 #ifdef QUOTA 175 error = getinoquota(oip); 176 if (error) 177 return (error); 178 #endif 179 if ((oip->i_flags & SF_SNAPSHOT) != 0) 180 ffs_snapremove(ovp); 181 ovp->v_lasta = ovp->v_clen = ovp->v_cstart = ovp->v_lastw = 0; 182 if (DOINGSOFTDEP(ovp)) { 183 if (length > 0 || softdep_slowdown(ovp)) { 184 /* 185 * If a file is only partially truncated, then 186 * we have to clean up the data structures 187 * describing the allocation past the truncation 188 * point. Finding and deallocating those structures 189 * is a lot of work. Since partial truncation occurs 190 * rarely, we solve the problem by syncing the file 191 * so that it will have no data structures left. 192 */ 193 if ((error = VOP_FSYNC(ovp, cred, MNT_WAIT, 194 p)) != 0) 195 return (error); 196 if (oip->i_flag & IN_SPACECOUNTED) 197 fs->fs_pendingblocks -= oip->i_blocks; 198 } else { 199 #ifdef QUOTA 200 (void) chkdq(oip, -oip->i_blocks, NOCRED, 0); 201 #endif 202 softdep_setup_freeblocks(oip, length); 203 vinvalbuf(ovp, 0, cred, p, 0, 0); 204 oip->i_flag |= IN_CHANGE | IN_UPDATE; 205 return (ffs_update(ovp, 0)); 206 } 207 } 208 osize = oip->i_size; 209 /* 210 * Lengthen the size of the file. We must ensure that the 211 * last byte of the file is allocated. Since the smallest 212 * value of osize is 0, length will be at least 1. 213 */ 214 if (osize < length) { 215 vnode_pager_setsize(ovp, length); 216 aflags = B_CLRBUF; 217 if (flags & IO_SYNC) 218 aflags |= B_SYNC; 219 error = UFS_BALLOC(ovp, length - 1, 1, 220 cred, aflags, &bp); 221 if (error) 222 return (error); 223 oip->i_size = length; 224 if (bp->b_bufsize == fs->fs_bsize) 225 bp->b_flags |= B_CLUSTEROK; 226 if (aflags & B_SYNC) 227 bwrite(bp); 228 else 229 bawrite(bp); 230 oip->i_flag |= IN_CHANGE | IN_UPDATE; 231 return (UFS_UPDATE(ovp, 1)); 232 } 233 /* 234 * Shorten the size of the file. If the file is not being 235 * truncated to a block boundary, the contents of the 236 * partial block following the end of the file must be 237 * zero'ed in case it ever becomes accessible again because 238 * of subsequent file growth. Directories however are not 239 * zero'ed as they should grow back initialized to empty. 240 */ 241 offset = blkoff(fs, length); 242 if (offset == 0) { 243 oip->i_size = length; 244 } else { 245 lbn = lblkno(fs, length); 246 aflags = B_CLRBUF; 247 if (flags & IO_SYNC) 248 aflags |= B_SYNC; 249 error = UFS_BALLOC(ovp, length - 1, 1, cred, aflags, &bp); 250 if (error) { 251 return (error); 252 } 253 oip->i_size = length; 254 size = blksize(fs, oip, lbn); 255 if (ovp->v_type != VDIR) 256 bzero((char *)bp->b_data + offset, 257 (u_int)(size - offset)); 258 /* Kirk's code has reallocbuf(bp, size, 1) here */ 259 allocbuf(bp, size); 260 if (bp->b_bufsize == fs->fs_bsize) 261 bp->b_flags |= B_CLUSTEROK; 262 if (aflags & B_SYNC) 263 bwrite(bp); 264 else 265 bawrite(bp); 266 } 267 /* 268 * Calculate index into inode's block list of 269 * last direct and indirect blocks (if any) 270 * which we want to keep. Lastblock is -1 when 271 * the file is truncated to 0. 272 */ 273 lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1; 274 lastiblock[SINGLE] = lastblock - NDADDR; 275 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); 276 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); 277 nblocks = btodb(fs->fs_bsize); 278 /* 279 * Update file and block pointers on disk before we start freeing 280 * blocks. If we crash before free'ing blocks below, the blocks 281 * will be returned to the free list. lastiblock values are also 282 * normalized to -1 for calls to ffs_indirtrunc below. 283 */ 284 bcopy((caddr_t)&oip->i_db[0], (caddr_t)oldblks, sizeof oldblks); 285 for (level = TRIPLE; level >= SINGLE; level--) 286 if (lastiblock[level] < 0) { 287 oip->i_ib[level] = 0; 288 lastiblock[level] = -1; 289 } 290 for (i = NDADDR - 1; i > lastblock; i--) 291 oip->i_db[i] = 0; 292 oip->i_flag |= IN_CHANGE | IN_UPDATE; 293 allerror = UFS_UPDATE(ovp, 1); 294 295 /* 296 * Having written the new inode to disk, save its new configuration 297 * and put back the old block pointers long enough to process them. 298 * Note that we save the new block configuration so we can check it 299 * when we are done. 300 */ 301 bcopy((caddr_t)&oip->i_db[0], (caddr_t)newblks, sizeof newblks); 302 bcopy((caddr_t)oldblks, (caddr_t)&oip->i_db[0], sizeof oldblks); 303 oip->i_size = osize; 304 305 error = vtruncbuf(ovp, cred, p, length, fs->fs_bsize); 306 if (error && (allerror == 0)) 307 allerror = error; 308 309 /* 310 * Indirect blocks first. 311 */ 312 indir_lbn[SINGLE] = -NDADDR; 313 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1; 314 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1; 315 for (level = TRIPLE; level >= SINGLE; level--) { 316 bn = oip->i_ib[level]; 317 if (bn != 0) { 318 error = ffs_indirtrunc(oip, indir_lbn[level], 319 fsbtodb(fs, bn), lastiblock[level], level, &count); 320 if (error) 321 allerror = error; 322 blocksreleased += count; 323 if (lastiblock[level] < 0) { 324 oip->i_ib[level] = 0; 325 ffs_blkfree(oip, bn, fs->fs_bsize); 326 blocksreleased += nblocks; 327 } 328 } 329 if (lastiblock[level] >= 0) 330 goto done; 331 } 332 333 /* 334 * All whole direct blocks or frags. 335 */ 336 for (i = NDADDR - 1; i > lastblock; i--) { 337 register long bsize; 338 339 bn = oip->i_db[i]; 340 if (bn == 0) 341 continue; 342 oip->i_db[i] = 0; 343 bsize = blksize(fs, oip, i); 344 ffs_blkfree(oip, bn, bsize); 345 blocksreleased += btodb(bsize); 346 } 347 if (lastblock < 0) 348 goto done; 349 350 /* 351 * Finally, look for a change in size of the 352 * last direct block; release any frags. 353 */ 354 bn = oip->i_db[lastblock]; 355 if (bn != 0) { 356 long oldspace, newspace; 357 358 /* 359 * Calculate amount of space we're giving 360 * back as old block size minus new block size. 361 */ 362 oldspace = blksize(fs, oip, lastblock); 363 oip->i_size = length; 364 newspace = blksize(fs, oip, lastblock); 365 if (newspace == 0) 366 panic("ffs_truncate: newspace"); 367 if (oldspace - newspace > 0) { 368 /* 369 * Block number of space to be free'd is 370 * the old block # plus the number of frags 371 * required for the storage we're keeping. 372 */ 373 bn += numfrags(fs, newspace); 374 ffs_blkfree(oip, bn, oldspace - newspace); 375 blocksreleased += btodb(oldspace - newspace); 376 } 377 } 378 done: 379 #ifdef DIAGNOSTIC 380 for (level = SINGLE; level <= TRIPLE; level++) 381 if (newblks[NDADDR + level] != oip->i_ib[level]) 382 panic("ffs_truncate1"); 383 for (i = 0; i < NDADDR; i++) 384 if (newblks[i] != oip->i_db[i]) 385 panic("ffs_truncate2"); 386 if (length == 0 && 387 (!TAILQ_EMPTY(&ovp->v_dirtyblkhd) || 388 !TAILQ_EMPTY(&ovp->v_cleanblkhd))) 389 panic("ffs_truncate3"); 390 #endif /* DIAGNOSTIC */ 391 /* 392 * Put back the real size. 393 */ 394 oip->i_size = length; 395 oip->i_blocks -= blocksreleased; 396 397 if (oip->i_blocks < 0) /* sanity */ 398 oip->i_blocks = 0; 399 oip->i_flag |= IN_CHANGE; 400 #ifdef QUOTA 401 (void) chkdq(oip, -blocksreleased, NOCRED, 0); 402 #endif 403 return (allerror); 404 } 405 406 /* 407 * Release blocks associated with the inode ip and stored in the indirect 408 * block bn. Blocks are free'd in LIFO order up to (but not including) 409 * lastbn. If level is greater than SINGLE, the block is an indirect block 410 * and recursive calls to indirtrunc must be used to cleanse other indirect 411 * blocks. 412 * 413 * NB: triple indirect blocks are untested. 414 */ 415 static int 416 ffs_indirtrunc(ip, lbn, dbn, lastbn, level, countp) 417 register struct inode *ip; 418 ufs_daddr_t lbn, lastbn; 419 ufs_daddr_t dbn; 420 int level; 421 long *countp; 422 { 423 register int i; 424 struct buf *bp; 425 register struct fs *fs = ip->i_fs; 426 register ufs_daddr_t *bap; 427 struct vnode *vp; 428 ufs_daddr_t *copy = NULL, nb, nlbn, last; 429 long blkcount, factor; 430 int nblocks, blocksreleased = 0; 431 int error = 0, allerror = 0; 432 433 /* 434 * Calculate index in current block of last 435 * block to be kept. -1 indicates the entire 436 * block so we need not calculate the index. 437 */ 438 factor = 1; 439 for (i = SINGLE; i < level; i++) 440 factor *= NINDIR(fs); 441 last = lastbn; 442 if (lastbn > 0) 443 last /= factor; 444 nblocks = btodb(fs->fs_bsize); 445 /* 446 * Get buffer of block pointers, zero those entries corresponding 447 * to blocks to be free'd, and update on disk copy first. Since 448 * double(triple) indirect before single(double) indirect, calls 449 * to bmap on these blocks will fail. However, we already have 450 * the on disk address, so we have to set the b_blkno field 451 * explicitly instead of letting bread do everything for us. 452 */ 453 vp = ITOV(ip); 454 bp = getblk(vp, lbn, (int)fs->fs_bsize, 0, 0); 455 if ((bp->b_flags & B_CACHE) == 0) { 456 curproc->p_stats->p_ru.ru_inblock++; /* pay for read */ 457 bp->b_iocmd = BIO_READ; 458 bp->b_flags &= ~B_INVAL; 459 bp->b_ioflags &= ~BIO_ERROR; 460 if (bp->b_bcount > bp->b_bufsize) 461 panic("ffs_indirtrunc: bad buffer size"); 462 bp->b_blkno = dbn; 463 vfs_busy_pages(bp, 0); 464 BUF_STRATEGY(bp); 465 error = bufwait(bp); 466 } 467 if (error) { 468 brelse(bp); 469 *countp = 0; 470 return (error); 471 } 472 473 bap = (ufs_daddr_t *)bp->b_data; 474 if (lastbn != -1) { 475 MALLOC(copy, ufs_daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK); 476 bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize); 477 bzero((caddr_t)&bap[last + 1], 478 (u_int)(NINDIR(fs) - (last + 1)) * sizeof (ufs_daddr_t)); 479 if (DOINGASYNC(vp)) { 480 bawrite(bp); 481 } else { 482 error = bwrite(bp); 483 if (error) 484 allerror = error; 485 } 486 bap = copy; 487 } 488 489 /* 490 * Recursively free totally unused blocks. 491 */ 492 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last; 493 i--, nlbn += factor) { 494 nb = bap[i]; 495 if (nb == 0) 496 continue; 497 if (level > SINGLE) { 498 if ((error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb), 499 (ufs_daddr_t)-1, level - 1, &blkcount)) != 0) 500 allerror = error; 501 blocksreleased += blkcount; 502 } 503 ffs_blkfree(ip, nb, fs->fs_bsize); 504 blocksreleased += nblocks; 505 } 506 507 /* 508 * Recursively free last partial block. 509 */ 510 if (level > SINGLE && lastbn >= 0) { 511 last = lastbn % factor; 512 nb = bap[i]; 513 if (nb != 0) { 514 error = ffs_indirtrunc(ip, nlbn, fsbtodb(fs, nb), 515 last, level - 1, &blkcount); 516 if (error) 517 allerror = error; 518 blocksreleased += blkcount; 519 } 520 } 521 if (copy != NULL) { 522 FREE(copy, M_TEMP); 523 } else { 524 bp->b_flags |= B_INVAL | B_NOCACHE; 525 brelse(bp); 526 } 527 528 *countp = blocksreleased; 529 return (allerror); 530 } 531