lfs_inode.c revision 1.83
1 /* $NetBSD: lfs_inode.c,v 1.83 2004/03/30 14:50:46 oster Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Konrad E. Schroder <perseant (at) hhhh.org>. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 /* 39 * Copyright (c) 1986, 1989, 1991, 1993 40 * The Regents of the University of California. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)lfs_inode.c 8.9 (Berkeley) 5/8/95 67 */ 68 69 #include <sys/cdefs.h> 70 __KERNEL_RCSID(0, "$NetBSD: lfs_inode.c,v 1.83 2004/03/30 14:50:46 oster Exp $"); 71 72 #if defined(_KERNEL_OPT) 73 #include "opt_quota.h" 74 #endif 75 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/mount.h> 79 #include <sys/proc.h> 80 #include <sys/file.h> 81 #include <sys/buf.h> 82 #include <sys/vnode.h> 83 #include <sys/kernel.h> 84 #include <sys/malloc.h> 85 #include <sys/trace.h> 86 #include <sys/resourcevar.h> 87 88 #include <ufs/ufs/quota.h> 89 #include <ufs/ufs/inode.h> 90 #include <ufs/ufs/ufsmount.h> 91 #include <ufs/ufs/ufs_extern.h> 92 93 #include <ufs/lfs/lfs.h> 94 #include <ufs/lfs/lfs_extern.h> 95 96 static int lfs_update_seguse(struct lfs *, long, size_t); 97 static int lfs_indirtrunc (struct inode *, daddr_t, daddr_t, 98 daddr_t, int, long *, long *, long *, size_t *, 99 struct proc *); 100 static int lfs_blkfree (struct lfs *, daddr_t, size_t, long *, size_t *); 101 static int lfs_vtruncbuf(struct vnode *, daddr_t, int, int); 102 103 /* Search a block for a specific dinode. */ 104 struct ufs1_dinode * 105 lfs_ifind(struct lfs *fs, ino_t ino, struct buf *bp) 106 { 107 struct ufs1_dinode *dip = (struct ufs1_dinode *)bp->b_data; 108 struct ufs1_dinode *ldip, *fin; 109 110 #ifdef LFS_IFILE_FRAG_ADDRESSING 111 if (fs->lfs_version == 1) 112 fin = dip + INOPB(fs); 113 else 114 fin = dip + INOPF(fs); 115 #else 116 fin = dip + INOPB(fs); 117 #endif 118 119 /* 120 * Read the inode block backwards, since later versions of the 121 * inode will supercede earlier ones. Though it is unlikely, it is 122 * possible that the same inode will appear in the same inode block. 123 */ 124 for (ldip = fin - 1; ldip >= dip; --ldip) 125 if (ldip->di_inumber == ino) 126 return (ldip); 127 128 printf("searched %d entries\n", (int)(fin - dip)); 129 printf("offset is 0x%x (seg %d)\n", fs->lfs_offset, 130 dtosn(fs, fs->lfs_offset)); 131 printf("block is 0x%llx (seg %lld)\n", 132 (unsigned long long)dbtofsb(fs, bp->b_blkno), 133 (long long)dtosn(fs, dbtofsb(fs, bp->b_blkno))); 134 135 return NULL; 136 } 137 138 int 139 lfs_update(void *v) 140 { 141 struct vop_update_args /* { 142 struct vnode *a_vp; 143 struct timespec *a_access; 144 struct timespec *a_modify; 145 int a_flags; 146 } */ *ap = v; 147 struct inode *ip; 148 struct vnode *vp = ap->a_vp; 149 struct timespec ts; 150 struct lfs *fs = VFSTOUFS(vp->v_mount)->um_lfs; 151 int s; 152 153 if (vp->v_mount->mnt_flag & MNT_RDONLY) 154 return (0); 155 ip = VTOI(vp); 156 157 /* 158 * If we are called from vinvalbuf, and the file's blocks have 159 * already been scheduled for writing, but the writes have not 160 * yet completed, lfs_vflush will not be called, and vinvalbuf 161 * will cause a panic. So, we must wait until any pending write 162 * for our inode completes, if we are called with UPDATE_WAIT set. 163 */ 164 s = splbio(); 165 while ((ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) == UPDATE_WAIT && 166 WRITEINPROG(vp)) { 167 #ifdef DEBUG_LFS 168 printf("lfs_update: sleeping on inode %d (in-progress)\n", 169 ip->i_number); 170 #endif 171 tsleep(vp, (PRIBIO+1), "lfs_update", 0); 172 } 173 splx(s); 174 TIMEVAL_TO_TIMESPEC(&time, &ts); 175 LFS_ITIMES(ip, 176 ap->a_access ? ap->a_access : &ts, 177 ap->a_modify ? ap->a_modify : &ts, &ts); 178 if ((ip->i_flag & (IN_MODIFIED | IN_ACCESSED | IN_CLEANING)) == 0) { 179 return (0); 180 } 181 182 /* If sync, push back the vnode and any dirty blocks it may have. */ 183 if ((ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) == UPDATE_WAIT) { 184 /* Avoid flushing VDIROP. */ 185 ++fs->lfs_diropwait; 186 while (vp->v_flag & VDIROP) { 187 #ifdef DEBUG_LFS 188 printf("lfs_update: sleeping on inode %d (dirops)\n", 189 ip->i_number); 190 printf("lfs_update: vflags 0x%x, iflags 0x%x\n", 191 vp->v_flag, ip->i_flag); 192 #endif 193 if (fs->lfs_dirops == 0) 194 lfs_flush_fs(fs, SEGM_SYNC); 195 else 196 tsleep(&fs->lfs_writer, PRIBIO+1, "lfs_fsync", 197 0); 198 /* XXX KS - by falling out here, are we writing the vn 199 twice? */ 200 } 201 --fs->lfs_diropwait; 202 return lfs_vflush(vp); 203 } 204 return 0; 205 } 206 207 #define SINGLE 0 /* index of single indirect block */ 208 #define DOUBLE 1 /* index of double indirect block */ 209 #define TRIPLE 2 /* index of triple indirect block */ 210 /* 211 * Truncate the inode oip to at most length size, freeing the 212 * disk blocks. 213 */ 214 /* VOP_BWRITE 1 + NIADDR + VOP_BALLOC == 2 + 2*NIADDR times */ 215 216 int 217 lfs_truncate(void *v) 218 { 219 struct vop_truncate_args /* { 220 struct vnode *a_vp; 221 off_t a_length; 222 int a_flags; 223 struct ucred *a_cred; 224 struct proc *a_p; 225 } */ *ap = v; 226 struct vnode *ovp = ap->a_vp; 227 struct genfs_node *gp = VTOG(ovp); 228 daddr_t lastblock; 229 struct inode *oip; 230 daddr_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR]; 231 /* XXX ondisk32 */ 232 int32_t newblks[NDADDR + NIADDR]; 233 off_t length = ap->a_length; 234 struct lfs *fs; 235 struct buf *bp; 236 int offset, size, level; 237 long count, rcount, nblocks, blocksreleased = 0, real_released = 0; 238 int i; 239 int aflags, error, allerror = 0; 240 off_t osize; 241 voff_t eoz; 242 long lastseg; 243 size_t bc; 244 int obufsize, odb; 245 int usepc; 246 247 if (length < 0) 248 return (EINVAL); 249 oip = VTOI(ovp); 250 251 /* 252 * Just return and not update modification times. 253 */ 254 if (oip->i_size == length) 255 return (0); 256 257 if (ovp->v_type == VLNK && 258 (oip->i_size < ovp->v_mount->mnt_maxsymlinklen || 259 (ovp->v_mount->mnt_maxsymlinklen == 0 && 260 oip->i_ffs1_blocks == 0))) { 261 #ifdef DIAGNOSTIC 262 if (length != 0) 263 panic("lfs_truncate: partial truncate of symlink"); 264 #endif 265 memset((char *)SHORTLINK(oip), 0, (u_int)oip->i_size); 266 oip->i_size = oip->i_ffs1_size = 0; 267 oip->i_flag |= IN_CHANGE | IN_UPDATE; 268 return (VOP_UPDATE(ovp, NULL, NULL, 0)); 269 } 270 if (oip->i_size == length) { 271 oip->i_flag |= IN_CHANGE | IN_UPDATE; 272 return (VOP_UPDATE(ovp, NULL, NULL, 0)); 273 } 274 #ifdef QUOTA 275 if ((error = getinoquota(oip)) != 0) 276 return (error); 277 #endif 278 fs = oip->i_lfs; 279 lfs_imtime(fs); 280 osize = oip->i_size; 281 usepc = (ovp->v_type == VREG && ovp != fs->lfs_ivnode); 282 283 /* 284 * Lengthen the size of the file. We must ensure that the 285 * last byte of the file is allocated. Since the smallest 286 * value of osize is 0, length will be at least 1. 287 */ 288 if (osize < length) { 289 if (length > fs->lfs_maxfilesize) 290 return (EFBIG); 291 aflags = B_CLRBUF; 292 if (ap->a_flags & IO_SYNC) 293 aflags |= B_SYNC; 294 if (usepc) { 295 if (lblkno(fs, osize) < NDADDR && 296 lblkno(fs, osize) != lblkno(fs, length) && 297 blkroundup(fs, osize) != osize) { 298 error = ufs_balloc_range(ovp, osize, 299 blkroundup(fs, osize) - 300 osize, ap->a_cred, 301 aflags); 302 if (error) { 303 return error; 304 } 305 if (ap->a_flags & IO_SYNC) { 306 ovp->v_size = blkroundup(fs, osize); 307 simple_lock(&ovp->v_interlock); 308 VOP_PUTPAGES(ovp, 309 trunc_page(osize & fs->lfs_bmask), 310 round_page(ovp->v_size), 311 PGO_CLEANIT | PGO_SYNCIO); 312 } 313 } 314 error = ufs_balloc_range(ovp, length - 1, 1, ap->a_cred, 315 aflags); 316 if (error) { 317 (void) VOP_TRUNCATE(ovp, osize, 318 ap->a_flags & IO_SYNC, 319 ap->a_cred, ap->a_p); 320 return error; 321 } 322 uvm_vnp_setsize(ovp, length); 323 oip->i_flag |= IN_CHANGE | IN_UPDATE; 324 KASSERT(ovp->v_size == oip->i_size); 325 return (VOP_UPDATE(ovp, NULL, NULL, 0)); 326 } else { 327 error = lfs_reserve(fs, ovp, NULL, 328 btofsb(fs, (NIADDR + 2) << fs->lfs_bshift)); 329 if (error) 330 return (error); 331 error = VOP_BALLOC(ovp, length - 1, 1, ap->a_cred, 332 aflags, &bp); 333 lfs_reserve(fs, ovp, NULL, 334 -btofsb(fs, (NIADDR + 2) << fs->lfs_bshift)); 335 if (error) 336 return (error); 337 oip->i_ffs1_size = oip->i_size = length; 338 uvm_vnp_setsize(ovp, length); 339 (void) VOP_BWRITE(bp); 340 oip->i_flag |= IN_CHANGE | IN_UPDATE; 341 return (VOP_UPDATE(ovp, NULL, NULL, 0)); 342 } 343 } 344 345 if ((error = lfs_reserve(fs, ovp, NULL, 346 btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift))) != 0) 347 return (error); 348 349 /* 350 * Shorten the size of the file. If the file is not being 351 * truncated to a block boundary, the contents of the 352 * partial block following the end of the file must be 353 * zero'ed in case it ever becomes accessible again because 354 * of subsequent file growth. Directories however are not 355 * zero'ed as they should grow back initialized to empty. 356 */ 357 offset = blkoff(fs, length); 358 lastseg = -1; 359 bc = 0; 360 361 lfs_seglock(fs, SEGM_PROT); 362 if (offset == 0) { 363 oip->i_size = oip->i_ffs1_size = length; 364 } else if (!usepc) { 365 lbn = lblkno(fs, length); 366 aflags = B_CLRBUF; 367 if (ap->a_flags & IO_SYNC) 368 aflags |= B_SYNC; 369 error = VOP_BALLOC(ovp, length - 1, 1, ap->a_cred, aflags, &bp); 370 if (error) { 371 lfs_reserve(fs, ovp, NULL, 372 -btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift)); 373 goto errout; 374 } 375 obufsize = bp->b_bufsize; 376 odb = btofsb(fs, bp->b_bcount); 377 oip->i_size = oip->i_ffs1_size = length; 378 size = blksize(fs, oip, lbn); 379 if (ovp->v_type != VDIR) 380 memset((char *)bp->b_data + offset, 0, 381 (u_int)(size - offset)); 382 allocbuf(bp, size, 1); 383 if ((bp->b_flags & (B_LOCKED | B_CALL)) == B_LOCKED) 384 locked_queue_bytes -= obufsize - bp->b_bufsize; 385 if (bp->b_flags & B_DELWRI) 386 fs->lfs_avail += odb - btofsb(fs, size); 387 (void) VOP_BWRITE(bp); 388 } else { /* vp->v_type == VREG && length < osize && offset != 0 */ 389 /* 390 * When truncating a regular file down to a non-block-aligned 391 * size, we must zero the part of last block which is past 392 * the new EOF. We must synchronously flush the zeroed pages 393 * to disk since the new pages will be invalidated as soon 394 * as we inform the VM system of the new, smaller size. 395 * We must do this before acquiring the GLOCK, since fetching 396 * the pages will acquire the GLOCK internally. 397 * So there is a window where another thread could see a whole 398 * zeroed page past EOF, but that's life. 399 */ 400 aflags = ap->a_flags & IO_SYNC ? B_SYNC : 0; 401 error = ufs_balloc_range(ovp, length - 1, 1, ap->a_cred, 402 aflags); 403 if (error) { 404 lfs_reserve(fs, ovp, NULL, 405 -btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift)); 406 goto errout; 407 } 408 eoz = blkroundup(fs, length); 409 uvm_vnp_zerorange(ovp, length, eoz - length); 410 simple_lock(&ovp->v_interlock); 411 error = VOP_PUTPAGES(ovp, trunc_page(length), round_page(eoz), 412 PGO_CLEANIT | PGO_DEACTIVATE | (aflags ? PGO_SYNCIO : 0)); 413 if (error) { 414 lfs_reserve(fs, ovp, NULL, 415 -btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift)); 416 goto errout; 417 } 418 } 419 420 lockmgr(&gp->g_glock, LK_EXCLUSIVE, NULL); 421 422 oip->i_size = oip->i_ffs1_size = length; 423 uvm_vnp_setsize(ovp, length); 424 /* 425 * Calculate index into inode's block list of 426 * last direct and indirect blocks (if any) 427 * which we want to keep. Lastblock is -1 when 428 * the file is truncated to 0. 429 */ 430 lastblock = lblkno(fs, length + fs->lfs_bsize - 1) - 1; 431 lastiblock[SINGLE] = lastblock - NDADDR; 432 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); 433 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); 434 nblocks = btofsb(fs, fs->lfs_bsize); 435 /* 436 * Record changed file and block pointers before we start 437 * freeing blocks. lastiblock values are also normalized to -1 438 * for calls to lfs_indirtrunc below. 439 */ 440 memcpy((caddr_t)newblks, (caddr_t)&oip->i_ffs1_db[0], sizeof newblks); 441 for (level = TRIPLE; level >= SINGLE; level--) 442 if (lastiblock[level] < 0) { 443 newblks[NDADDR+level] = 0; 444 lastiblock[level] = -1; 445 } 446 for (i = NDADDR - 1; i > lastblock; i--) 447 newblks[i] = 0; 448 449 oip->i_size = oip->i_ffs1_size = osize; 450 error = lfs_vtruncbuf(ovp, lastblock + 1, 0, 0); 451 if (error && !allerror) 452 allerror = error; 453 454 /* 455 * Indirect blocks first. 456 */ 457 indir_lbn[SINGLE] = -NDADDR; 458 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) - 1; 459 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1; 460 for (level = TRIPLE; level >= SINGLE; level--) { 461 bn = oip->i_ffs1_ib[level]; 462 if (bn != 0) { 463 error = lfs_indirtrunc(oip, indir_lbn[level], 464 bn, lastiblock[level], 465 level, &count, &rcount, 466 &lastseg, &bc, ap->a_p); 467 if (error) 468 allerror = error; 469 real_released += rcount; 470 blocksreleased += count; 471 if (lastiblock[level] < 0) { 472 if (oip->i_ffs1_ib[level] > 0) 473 real_released += nblocks; 474 blocksreleased += nblocks; 475 oip->i_ffs1_ib[level] = 0; 476 lfs_blkfree(fs, bn, fs->lfs_bsize, &lastseg, &bc); 477 } 478 } 479 if (lastiblock[level] >= 0) 480 goto done; 481 } 482 483 /* 484 * All whole direct blocks or frags. 485 */ 486 for (i = NDADDR - 1; i > lastblock; i--) { 487 long bsize, obsize; 488 489 bn = oip->i_ffs1_db[i]; 490 if (bn == 0) 491 continue; 492 bsize = blksize(fs, oip, i); 493 if (oip->i_ffs1_db[i] > 0) { 494 /* Check for fragment size changes */ 495 obsize = oip->i_lfs_fragsize[i]; 496 real_released += btofsb(fs, obsize); 497 oip->i_lfs_fragsize[i] = 0; 498 } else 499 obsize = 0; 500 blocksreleased += btofsb(fs, bsize); 501 oip->i_ffs1_db[i] = 0; 502 lfs_blkfree(fs, bn, obsize, &lastseg, &bc); 503 } 504 if (lastblock < 0) 505 goto done; 506 507 /* 508 * Finally, look for a change in size of the 509 * last direct block; release any frags. 510 */ 511 bn = oip->i_ffs1_db[lastblock]; 512 if (bn != 0) { 513 long oldspace, newspace; 514 #if 0 515 long olddspace; 516 #endif 517 518 /* 519 * Calculate amount of space we're giving 520 * back as old block size minus new block size. 521 */ 522 oldspace = blksize(fs, oip, lastblock); 523 #if 0 524 olddspace = oip->i_lfs_fragsize[lastblock]; 525 #endif 526 527 oip->i_size = oip->i_ffs1_size = length; 528 newspace = blksize(fs, oip, lastblock); 529 if (newspace == 0) 530 panic("itrunc: newspace"); 531 if (oldspace - newspace > 0) { 532 blocksreleased += btofsb(fs, oldspace - newspace); 533 } 534 #if 0 535 if (bn > 0 && olddspace - newspace > 0) { 536 /* No segment accounting here, just vnode */ 537 real_released += btofsb(fs, olddspace - newspace); 538 } 539 #endif 540 } 541 542 done: 543 /* Finish segment accounting corrections */ 544 lfs_update_seguse(fs, lastseg, bc); 545 #ifdef DIAGNOSTIC 546 for (level = SINGLE; level <= TRIPLE; level++) 547 if ((newblks[NDADDR + level] == 0) != 548 (oip->i_ffs1_ib[level]) == 0) { 549 panic("lfs itrunc1"); 550 } 551 for (i = 0; i < NDADDR; i++) 552 if ((newblks[i] == 0) != (oip->i_ffs1_db[i] == 0)) { 553 panic("lfs itrunc2"); 554 } 555 if (length == 0 && 556 (!LIST_EMPTY(&ovp->v_cleanblkhd) || !LIST_EMPTY(&ovp->v_dirtyblkhd))) 557 panic("lfs itrunc3"); 558 #endif /* DIAGNOSTIC */ 559 /* 560 * Put back the real size. 561 */ 562 oip->i_size = oip->i_ffs1_size = length; 563 oip->i_lfs_effnblks -= blocksreleased; 564 oip->i_ffs1_blocks -= real_released; 565 fs->lfs_bfree += blocksreleased; 566 #ifdef DIAGNOSTIC 567 if (oip->i_size == 0 && 568 (oip->i_ffs1_blocks != 0 || oip->i_lfs_effnblks != 0)) { 569 printf("lfs_truncate: truncate to 0 but %d blks/%d effblks\n", 570 oip->i_ffs1_blocks, oip->i_lfs_effnblks); 571 panic("lfs_truncate: persistent blocks"); 572 } 573 #endif 574 oip->i_flag |= IN_CHANGE; 575 #ifdef QUOTA 576 (void) chkdq(oip, -blocksreleased, NOCRED, 0); 577 #endif 578 lfs_reserve(fs, ovp, NULL, 579 -btofsb(fs, (2 * NIADDR + 3) << fs->lfs_bshift)); 580 lockmgr(&gp->g_glock, LK_RELEASE, NULL); 581 errout: 582 lfs_segunlock(fs); 583 return (allerror ? allerror : error); 584 } 585 586 /* Update segment usage information when removing a block. */ 587 static int 588 lfs_blkfree(struct lfs *fs, daddr_t daddr, size_t bsize, long *lastseg, 589 size_t *num) 590 { 591 long seg; 592 int error = 0; 593 594 bsize = fragroundup(fs, bsize); 595 if (daddr > 0) { 596 if (*lastseg != (seg = dtosn(fs, daddr))) { 597 error = lfs_update_seguse(fs, *lastseg, *num); 598 *num = bsize; 599 *lastseg = seg; 600 } else 601 *num += bsize; 602 } 603 return error; 604 } 605 606 /* Finish the accounting updates for a segment. */ 607 static int 608 lfs_update_seguse(struct lfs *fs, long lastseg, size_t num) 609 { 610 SEGUSE *sup; 611 struct buf *bp; 612 613 if (lastseg < 0 || num == 0) 614 return 0; 615 616 LFS_SEGENTRY(sup, fs, lastseg, bp); 617 if (num > sup->su_nbytes) { 618 printf("lfs_truncate: segment %ld short by %ld\n", 619 lastseg, (long)num - sup->su_nbytes); 620 panic("lfs_truncate: negative bytes"); 621 sup->su_nbytes = num; 622 } 623 sup->su_nbytes -= num; 624 LFS_WRITESEGENTRY(sup, fs, lastseg, bp); 625 626 return 0; 627 } 628 629 /* 630 * Release blocks associated with the inode ip and stored in the indirect 631 * block bn. Blocks are free'd in LIFO order up to (but not including) 632 * lastbn. If level is greater than SINGLE, the block is an indirect block 633 * and recursive calls to indirtrunc must be used to cleanse other indirect 634 * blocks. 635 * 636 * NB: triple indirect blocks are untested. 637 */ 638 static int 639 lfs_indirtrunc(struct inode *ip, daddr_t lbn, daddr_t dbn, 640 daddr_t lastbn, int level, long *countp, 641 long *rcountp, long *lastsegp, size_t *bcp, struct proc *p) 642 { 643 int i; 644 struct buf *bp; 645 struct lfs *fs = ip->i_lfs; 646 int32_t *bap; /* XXX ondisk32 */ 647 struct vnode *vp; 648 daddr_t nb, nlbn, last; 649 int32_t *copy = NULL; /* XXX ondisk32 */ 650 long blkcount, rblkcount, factor; 651 int nblocks, blocksreleased = 0, real_released = 0; 652 int error = 0, allerror = 0; 653 654 /* 655 * Calculate index in current block of last 656 * block to be kept. -1 indicates the entire 657 * block so we need not calculate the index. 658 */ 659 factor = 1; 660 for (i = SINGLE; i < level; i++) 661 factor *= NINDIR(fs); 662 last = lastbn; 663 if (lastbn > 0) 664 last /= factor; 665 nblocks = btofsb(fs, fs->lfs_bsize); 666 /* 667 * Get buffer of block pointers, zero those entries corresponding 668 * to blocks to be free'd, and update on disk copy first. Since 669 * double(triple) indirect before single(double) indirect, calls 670 * to bmap on these blocks will fail. However, we already have 671 * the on disk address, so we have to set the b_blkno field 672 * explicitly instead of letting bread do everything for us. 673 */ 674 vp = ITOV(ip); 675 bp = getblk(vp, lbn, (int)fs->lfs_bsize, 0, 0); 676 if (bp->b_flags & (B_DONE | B_DELWRI)) { 677 /* Braces must be here in case trace evaluates to nothing. */ 678 trace(TR_BREADHIT, pack(vp, fs->lfs_bsize), lbn); 679 } else { 680 trace(TR_BREADMISS, pack(vp, fs->lfs_bsize), lbn); 681 p->p_stats->p_ru.ru_inblock++; /* pay for read */ 682 bp->b_flags |= B_READ; 683 if (bp->b_bcount > bp->b_bufsize) 684 panic("lfs_indirtrunc: bad buffer size"); 685 bp->b_blkno = fsbtodb(fs, dbn); 686 VOP_STRATEGY(vp, bp); 687 error = biowait(bp); 688 } 689 if (error) { 690 brelse(bp); 691 *countp = *rcountp = 0; 692 return (error); 693 } 694 695 bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ 696 if (lastbn >= 0) { 697 MALLOC(copy, int32_t *, fs->lfs_bsize, M_TEMP, M_WAITOK); 698 memcpy((caddr_t)copy, (caddr_t)bap, (u_int)fs->lfs_bsize); 699 memset((caddr_t)&bap[last + 1], 0, 700 /* XXX ondisk32 */ 701 (u_int)(NINDIR(fs) - (last + 1)) * sizeof (int32_t)); 702 error = VOP_BWRITE(bp); 703 if (error) 704 allerror = error; 705 bap = copy; 706 } 707 708 /* 709 * Recursively free totally unused blocks. 710 */ 711 for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last; 712 i--, nlbn += factor) { 713 nb = bap[i]; 714 if (nb == 0) 715 continue; 716 if (level > SINGLE) { 717 error = lfs_indirtrunc(ip, nlbn, nb, 718 (daddr_t)-1, level - 1, 719 &blkcount, &rblkcount, 720 lastsegp, bcp, p); 721 if (error) 722 allerror = error; 723 blocksreleased += blkcount; 724 real_released += rblkcount; 725 } 726 lfs_blkfree(fs, nb, fs->lfs_bsize, lastsegp, bcp); 727 if (bap[i] > 0) 728 real_released += nblocks; 729 blocksreleased += nblocks; 730 } 731 732 /* 733 * Recursively free last partial block. 734 */ 735 if (level > SINGLE && lastbn >= 0) { 736 last = lastbn % factor; 737 nb = bap[i]; 738 if (nb != 0) { 739 error = lfs_indirtrunc(ip, nlbn, nb, 740 last, level - 1, &blkcount, 741 &rblkcount, lastsegp, bcp, p); 742 if (error) 743 allerror = error; 744 real_released += rblkcount; 745 blocksreleased += blkcount; 746 } 747 } 748 749 if (copy != NULL) { 750 FREE(copy, M_TEMP); 751 } else { 752 if (bp->b_flags & B_DELWRI) { 753 LFS_UNLOCK_BUF(bp); 754 fs->lfs_avail += btofsb(fs, bp->b_bcount); 755 wakeup(&fs->lfs_avail); 756 } 757 bp->b_flags |= B_INVAL; 758 brelse(bp); 759 } 760 761 *countp = blocksreleased; 762 *rcountp = real_released; 763 return (allerror); 764 } 765 766 /* 767 * Destroy any in core blocks past the truncation length. 768 * Inlined from vtruncbuf, so that lfs_avail could be updated. 769 * We take the seglock to prevent cleaning from occurring while we are 770 * invalidating blocks. 771 */ 772 static int 773 lfs_vtruncbuf(struct vnode *vp, daddr_t lbn, int slpflag, int slptimeo) 774 { 775 struct buf *bp, *nbp; 776 int s, error; 777 struct lfs *fs; 778 voff_t off; 779 780 off = round_page((voff_t)lbn << vp->v_mount->mnt_fs_bshift); 781 simple_lock(&vp->v_interlock); 782 error = VOP_PUTPAGES(vp, off, 0, PGO_FREE | PGO_SYNCIO); 783 if (error) { 784 return error; 785 } 786 787 fs = VTOI(vp)->i_lfs; 788 s = splbio(); 789 790 restart: 791 for (bp = LIST_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { 792 nbp = LIST_NEXT(bp, b_vnbufs); 793 if (bp->b_lblkno < lbn) 794 continue; 795 simple_lock(&bp->b_interlock); 796 if (bp->b_flags & B_BUSY) { 797 bp->b_flags |= B_WANTED; 798 error = ltsleep(bp, slpflag | (PRIBIO + 1) | PNORELOCK, 799 "lfs_vtruncbuf", slptimeo, &bp->b_interlock); 800 if (error) { 801 splx(s); 802 return (error); 803 } 804 goto restart; 805 } 806 bp->b_flags |= B_BUSY | B_INVAL | B_VFLUSH; 807 if (bp->b_flags & B_DELWRI) { 808 bp->b_flags &= ~B_DELWRI; 809 fs->lfs_avail += btofsb(fs, bp->b_bcount); 810 wakeup(&fs->lfs_avail); 811 } 812 LFS_UNLOCK_BUF(bp); 813 simple_unlock(&bp->b_interlock); 814 brelse(bp); 815 } 816 817 for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 818 nbp = LIST_NEXT(bp, b_vnbufs); 819 if (bp->b_lblkno < lbn) 820 continue; 821 simple_lock(&bp->b_interlock); 822 if (bp->b_flags & B_BUSY) { 823 bp->b_flags |= B_WANTED; 824 error = ltsleep(bp, slpflag | (PRIBIO + 1) | PNORELOCK, 825 "lfs_vtruncbuf", slptimeo, &bp->b_interlock); 826 if (error) { 827 splx(s); 828 return (error); 829 } 830 goto restart; 831 } 832 bp->b_flags |= B_BUSY | B_INVAL | B_VFLUSH; 833 if (bp->b_flags & B_DELWRI) { 834 bp->b_flags &= ~B_DELWRI; 835 fs->lfs_avail += btofsb(fs, bp->b_bcount); 836 wakeup(&fs->lfs_avail); 837 } 838 LFS_UNLOCK_BUF(bp); 839 simple_unlock(&bp->b_interlock); 840 brelse(bp); 841 } 842 843 splx(s); 844 845 return (0); 846 } 847 848
Indexes created Fri Sep 26 08:10:20 GMT 2025