1 /* $OpenBSD: ext2fs_inode.c,v 1.43 2008/11/23 23:52:35 tedu Exp $ */ 2 /* $NetBSD: ext2fs_inode.c,v 1.24 2001/06/19 12:59:18 wiz Exp $ */ 3 4 /* 5 * Copyright (c) 1997 Manuel Bouyer. 6 * Copyright (c) 1982, 1986, 1989, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. 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 8.8 (Berkeley) 10/19/94 34 * Modified for ext2fs by Manuel Bouyer. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mount.h> 40 #include <sys/proc.h> 41 #include <sys/file.h> 42 #include <sys/buf.h> 43 #include <sys/vnode.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/resourcevar.h> 47 48 #include <uvm/uvm_extern.h> 49 50 #include <ufs/ufs/quota.h> 51 #include <ufs/ufs/inode.h> 52 #include <ufs/ufs/ufsmount.h> 53 #include <ufs/ufs/ufs_extern.h> 54 55 #include <ufs/ext2fs/ext2fs.h> 56 #include <ufs/ext2fs/ext2fs_extern.h> 57 58 static int ext2fs_indirtrunc(struct inode *, int32_t, int32_t, 59 int32_t, int, long *); 60 61 /* 62 * Get the size of an inode. 63 */ 64 u_int64_t 65 ext2fs_size(struct inode *ip) 66 { 67 u_int64_t size = ip->i_e2fs_size; 68 69 if ((ip->i_e2fs_mode & IFMT) == IFREG) 70 size |= (u_int64_t)ip->i_e2fs_dacl << 32; 71 72 return (size); 73 } 74 75 int 76 ext2fs_setsize(struct inode *ip, u_int64_t size) 77 { 78 if ((ip->i_e2fs_mode & IFMT) == IFREG || 79 ip->i_e2fs_mode == 0) { 80 ip->i_e2fs_dacl = size >> 32; 81 if (size >= 0x80000000U) { 82 struct m_ext2fs *fs = ip->i_e2fs; 83 84 if (fs->e2fs.e2fs_rev <= E2FS_REV0) { 85 /* Linux automagically upgrades to REV1 here! */ 86 return (EFBIG); 87 } 88 if (!(fs->e2fs.e2fs_features_rocompat 89 & EXT2F_ROCOMPAT_LARGEFILE)) { 90 fs->e2fs.e2fs_features_rocompat |= 91 EXT2F_ROCOMPAT_LARGEFILE; 92 fs->e2fs_fmod = 1; 93 } 94 } 95 } else if (size >= 0x80000000U) 96 return (EFBIG); 97 98 ip->i_e2fs_size = size; 99 100 return (0); 101 } 102 103 104 /* 105 * Last reference to an inode. If necessary, write or delete it. 106 */ 107 int 108 ext2fs_inactive(void *v) 109 { 110 struct vop_inactive_args *ap = v; 111 struct vnode *vp = ap->a_vp; 112 struct inode *ip = VTOI(vp); 113 struct proc *p = ap->a_p; 114 struct timespec ts; 115 int error = 0; 116 #ifdef DIAGNOSTIC 117 extern int prtactive; 118 119 if (prtactive && vp->v_usecount != 0) 120 vprint("ext2fs_inactive: pushing active", vp); 121 #endif 122 123 /* Get rid of inodes related to stale file handles. */ 124 if (ip->i_e2din == NULL || ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime) 125 goto out; 126 127 error = 0; 128 if (ip->i_e2fs_nlink == 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 129 if (ext2fs_size(ip) != 0) { 130 error = ext2fs_truncate(ip, (off_t)0, 0, NOCRED); 131 } 132 getnanotime(&ts); 133 ip->i_e2fs_dtime = ts.tv_sec; 134 ip->i_flag |= IN_CHANGE | IN_UPDATE; 135 ext2fs_inode_free(ip, ip->i_number, ip->i_e2fs_mode); 136 } 137 if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) { 138 ext2fs_update(ip, NULL, NULL, 0); 139 } 140 out: 141 VOP_UNLOCK(vp, 0, p); 142 /* 143 * If we are done with the inode, reclaim it 144 * so that it can be reused immediately. 145 */ 146 if (ip->i_e2din == NULL || ip->i_e2fs_dtime != 0) 147 vrecycle(vp, p); 148 return (error); 149 } 150 151 152 /* 153 * Update the access, modified, and inode change times as specified by the 154 * IACCESS, IUPDATE, and ICHANGE flags respectively. The IMODIFIED flag is 155 * used to specify that the inode needs to be updated but that the times have 156 * already been set. The access and modified times are taken from the second 157 * and third parameters; the inode change time is always taken from the current 158 * time. If waitfor is set, then wait for the disk write of the inode to 159 * complete. 160 */ 161 int 162 ext2fs_update(struct inode *ip, struct timespec *atime, struct timespec *mtime, 163 int waitfor) 164 { 165 struct m_ext2fs *fs; 166 struct buf *bp; 167 int error; 168 struct timespec ts; 169 caddr_t cp; 170 171 if (ITOV(ip)->v_mount->mnt_flag & MNT_RDONLY) 172 return (0); 173 getnanotime(&ts); 174 EXT2FS_ITIMES(ip, 175 atime ? atime : &ts, 176 mtime ? mtime : &ts); 177 if ((ip->i_flag & IN_MODIFIED) == 0) 178 return (0); 179 ip->i_flag &= ~IN_MODIFIED; 180 fs = ip->i_e2fs; 181 error = bread(ip->i_devvp, 182 fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 183 (int)fs->e2fs_bsize, NOCRED, &bp); 184 if (error) { 185 brelse(bp); 186 return (error); 187 } 188 ip->i_flag &= ~(IN_MODIFIED); 189 cp = (caddr_t)bp->b_data + 190 (ino_to_fsbo(fs, ip->i_number) * EXT2_DINODE_SIZE(fs)); 191 192 /* 193 * See note about 16-bit UID/GID limitation in ext2fs_vget(). Now 194 * that we are about to write the inode, construct the split UID and 195 * GID fields out of the two 32-bit fields we kept in memory. 196 */ 197 ip->i_e2fs_uid_low = (u_int16_t)ip->i_e2fs_uid; 198 ip->i_e2fs_gid_low = (u_int16_t)ip->i_e2fs_gid; 199 ip->i_e2fs_uid_high = ip->i_e2fs_uid >> 16; 200 ip->i_e2fs_gid_high = ip->i_e2fs_gid >> 16; 201 202 e2fs_isave(ip->i_e2din, (struct ext2fs_dinode *)cp); 203 if (waitfor) 204 return (bwrite(bp)); 205 else { 206 bdwrite(bp); 207 return (0); 208 } 209 } 210 211 #define SINGLE 0 /* index of single indirect block */ 212 #define DOUBLE 1 /* index of double indirect block */ 213 #define TRIPLE 2 /* index of triple indirect block */ 214 /* 215 * Truncate the inode oip to at most length size, freeing the 216 * disk blocks. 217 */ 218 int 219 ext2fs_truncate(struct inode *oip, off_t length, int flags, struct ucred *cred) 220 { 221 struct vnode *ovp = ITOV(oip); 222 int32_t lastblock; 223 int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR]; 224 int32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR]; 225 struct m_ext2fs *fs; 226 struct buf *bp; 227 int offset, size, level; 228 long count, nblocks, vflags, blocksreleased = 0; 229 int i; 230 int aflags, error, allerror; 231 off_t osize; 232 233 if (length < 0) 234 return (EINVAL); 235 236 if (ovp->v_type != VREG && 237 ovp->v_type != VDIR && 238 ovp->v_type != VLNK) 239 return (0); 240 241 if (ovp->v_type == VLNK && 242 (ext2fs_size(oip) < ovp->v_mount->mnt_maxsymlinklen || 243 (ovp->v_mount->mnt_maxsymlinklen == 0 && 244 oip->i_e2fs_nblock == 0))) { 245 #ifdef DIAGNOSTIC 246 if (length != 0) 247 panic("ext2fs_truncate: partial truncate of symlink"); 248 #endif 249 bzero((char *)&oip->i_e2din->e2di_shortlink, 250 (u_int)ext2fs_size(oip)); 251 (void)ext2fs_setsize(oip, 0); 252 oip->i_flag |= IN_CHANGE | IN_UPDATE; 253 return (ext2fs_update(oip, NULL, NULL, 1)); 254 } 255 256 if (ext2fs_size(oip) == length) { 257 oip->i_flag |= IN_CHANGE | IN_UPDATE; 258 return (ext2fs_update(oip, NULL, NULL, 0)); 259 } 260 fs = oip->i_e2fs; 261 osize = ext2fs_size(oip); 262 /* 263 * Lengthen the size of the file. We must ensure that the 264 * last byte of the file is allocated. Since the smallest 265 * value of osize is 0, length will be at least 1. 266 */ 267 if (osize < length) { 268 #if 0 /* XXX */ 269 if (length > fs->fs_maxfilesize) 270 return (EFBIG); 271 #endif 272 offset = blkoff(fs, length - 1); 273 lbn = lblkno(fs, length - 1); 274 aflags = B_CLRBUF; 275 if (flags & IO_SYNC) 276 aflags |= B_SYNC; 277 error = ext2fs_buf_alloc(oip, lbn, offset + 1, cred, &bp, 278 aflags); 279 if (error) 280 return (error); 281 (void)ext2fs_setsize(oip, length); 282 uvm_vnp_setsize(ovp, length); 283 uvm_vnp_uncache(ovp); 284 if (aflags & B_SYNC) 285 bwrite(bp); 286 else 287 bawrite(bp); 288 oip->i_flag |= IN_CHANGE | IN_UPDATE; 289 return (ext2fs_update(oip, NULL, NULL, 1)); 290 } 291 /* 292 * Shorten the size of the file. If the file is not being 293 * truncated to a block boundry, the contents of the 294 * partial block following the end of the file must be 295 * zero'ed in case it ever become accessible again because 296 * of subsequent file growth. 297 */ 298 offset = blkoff(fs, length); 299 if (offset == 0) { 300 (void)ext2fs_setsize(oip, length); 301 } else { 302 lbn = lblkno(fs, length); 303 aflags = B_CLRBUF; 304 if (flags & IO_SYNC) 305 aflags |= B_SYNC; 306 error = ext2fs_buf_alloc(oip, lbn, offset, cred, &bp, 307 aflags); 308 if (error) 309 return (error); 310 (void)ext2fs_setsize(oip, length); 311 size = fs->e2fs_bsize; 312 uvm_vnp_setsize(ovp, length); 313 uvm_vnp_uncache(ovp); 314 bzero(bp->b_data + offset, (u_int)(size - offset)); 315 bp->b_bcount = size; 316 if (aflags & B_SYNC) 317 bwrite(bp); 318 else 319 bawrite(bp); 320 } 321 /* 322 * Calculate index into inode's block list of 323 * last direct and indirect blocks (if any) 324 * which we want to keep. Lastblock is -1 when 325 * the file is truncated to 0. 326 */ 327 lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1; 328 lastiblock[SINGLE] = lastblock - NDADDR; 329 lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); 330 lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); 331 nblocks = btodb(fs->e2fs_bsize); 332 /* 333 * Update file and block pointers on disk before we start freeing 334 * blocks. If we crash before free'ing blocks below, the blocks 335 * will be returned to the free list. lastiblock values are also 336 * normalized to -1 for calls to ext2fs_indirtrunc below. 337 */ 338 memcpy((caddr_t)oldblks, (caddr_t)&oip->i_e2fs_blocks[0], sizeof oldblks); 339 for (level = TRIPLE; level >= SINGLE; level--) 340 if (lastiblock[level] < 0) { 341 oip->i_e2fs_blocks[NDADDR + level] = 0; 342 lastiblock[level] = -1; 343 } 344 for (i = NDADDR - 1; i > lastblock; i--) 345 oip->i_e2fs_blocks[i] = 0; 346 oip->i_flag |= IN_CHANGE | IN_UPDATE; 347 if ((error = ext2fs_update(oip, NULL, NULL, 1)) != 0) 348 allerror = error; 349 /* 350 * Having written the new inode to disk, save its new configuration 351 * and put back the old block pointers long enough to process them. 352 * Note that we save the new block configuration so we can check it 353 * when we are done. 354 */ 355 bcopy((caddr_t)&oip->i_e2fs_blocks[0], (caddr_t)newblks, sizeof newblks); 356 bcopy((caddr_t)oldblks, (caddr_t)&oip->i_e2fs_blocks[0], sizeof oldblks); 357 (void)ext2fs_setsize(oip, osize); 358 vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA; 359 allerror = vinvalbuf(ovp, vflags, cred, curproc, 0, 0); 360 361 /* 362 * Indirect blocks first. 363 */ 364 indir_lbn[SINGLE] = -NDADDR; 365 indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) -1; 366 indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1; 367 for (level = TRIPLE; level >= SINGLE; level--) { 368 bn = fs2h32(oip->i_e2fs_blocks[NDADDR + level]); 369 if (bn != 0) { 370 error = ext2fs_indirtrunc(oip, indir_lbn[level], 371 fsbtodb(fs, bn), lastiblock[level], level, &count); 372 if (error) 373 allerror = error; 374 blocksreleased += count; 375 if (lastiblock[level] < 0) { 376 oip->i_e2fs_blocks[NDADDR + level] = 0; 377 ext2fs_blkfree(oip, bn); 378 blocksreleased += nblocks; 379 } 380 } 381 if (lastiblock[level] >= 0) 382 goto done; 383 } 384 385 /* 386 * All whole direct blocks or frags. 387 */ 388 for (i = NDADDR - 1; i > lastblock; i--) { 389 bn = fs2h32(oip->i_e2fs_blocks[i]); 390 if (bn == 0) 391 continue; 392 oip->i_e2fs_blocks[i] = 0; 393 ext2fs_blkfree(oip, bn); 394 blocksreleased += btodb(fs->e2fs_bsize); 395 } 396 397 done: 398 #ifdef DIAGNOSTIC 399 for (level = SINGLE; level <= TRIPLE; level++) 400 if (newblks[NDADDR + level] != 401 oip->i_e2fs_blocks[NDADDR + level]) 402 panic("ext2fs_truncate1"); 403 for (i = 0; i < NDADDR; i++) 404 if (newblks[i] != oip->i_e2fs_blocks[i]) 405 panic("ext2fs_truncate2"); 406 if (length == 0 && 407 (!LIST_EMPTY(&ovp->v_cleanblkhd) || 408 !LIST_EMPTY(&ovp->v_dirtyblkhd))) 409 panic("ext2fs_truncate3"); 410 #endif /* DIAGNOSTIC */ 411 /* 412 * Put back the real size. 413 */ 414 (void)ext2fs_setsize(oip, length); 415 if (blocksreleased >= oip->i_e2fs_nblock) 416 oip->i_e2fs_nblock = 0; 417 else 418 oip->i_e2fs_nblock -= blocksreleased; 419 oip->i_flag |= IN_CHANGE; 420 return (allerror); 421 } 422 423 /* 424 * Release blocks associated with the inode ip and stored in the indirect 425 * block bn. Blocks are free'd in LIFO order up to (but not including) 426 * lastbn. If level is greater than SINGLE, the block is an indirect block 427 * and recursive calls to indirtrunc must be used to cleanse other indirect 428 * blocks. 429 * 430 * NB: triple indirect blocks are untested. 431 */ 432 static int 433 ext2fs_indirtrunc(struct inode *ip, int32_t lbn, int32_t dbn, int32_t lastbn, int level, long *countp) 434 { 435 int i; 436 struct buf *bp; 437 struct m_ext2fs *fs = ip->i_e2fs; 438 int32_t *bap; 439 struct vnode *vp; 440 int32_t *copy = NULL, nb, nlbn, last; 441 long blkcount, factor; 442 int nblocks, blocksreleased = 0; 443 int error = 0, allerror = 0; 444 445 /* 446 * Calculate index in current block of last 447 * block to be kept. -1 indicates the entire 448 * block so we need not calculate the index. 449 */ 450 factor = 1; 451 for (i = SINGLE; i < level; i++) 452 factor *= NINDIR(fs); 453 last = lastbn; 454 if (lastbn > 0) 455 last /= factor; 456 nblocks = btodb(fs->e2fs_bsize); 457 /* 458 * Get buffer of block pointers, zero those entries corresponding 459 * to blocks to be free'd, and update on disk copy first. Since 460 * double(triple) indirect before single(double) indirect, calls 461 * to bmap on these blocks will fail. However, we already have 462 * the on disk address, so we have to set the b_blkno field 463 * explicitly instead of letting bread do everything for us. 464 */ 465 vp = ITOV(ip); 466 bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0); 467 if (!(bp->b_flags & (B_DONE | B_DELWRI))) { 468 curproc->p_stats->p_ru.ru_inblock++; /* pay for read */ 469 bcstats.pendingreads++; 470 bcstats.numreads++; 471 bp->b_flags |= B_READ; 472 if (bp->b_bcount > bp->b_bufsize) 473 panic("ext2fs_indirtrunc: bad buffer size"); 474 bp->b_blkno = dbn; 475 VOP_STRATEGY(bp); 476 error = biowait(bp); 477 } 478 if (error) { 479 brelse(bp); 480 *countp = 0; 481 return (error); 482 } 483 484 bap = (int32_t *)bp->b_data; 485 if (lastbn >= 0) { 486 copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK); 487 memcpy((caddr_t)copy, (caddr_t)bap, (u_int)fs->e2fs_bsize); 488 memset((caddr_t)&bap[last + 1], 0, 489 (u_int)(NINDIR(fs) - (last + 1)) * sizeof (u_int32_t)); 490 error = bwrite(bp); 491 if (error) 492 allerror = error; 493 bap = copy; 494 } 495 496 /* 497 * Recursively free totally unused blocks. 498 */ 499 for (i = NINDIR(fs) - 1, 500 nlbn = lbn + 1 - i * factor; i > last; 501 i--, nlbn += factor) { 502 nb = fs2h32(bap[i]); 503 if (nb == 0) 504 continue; 505 if (level > SINGLE) { 506 error = ext2fs_indirtrunc(ip, nlbn, fsbtodb(fs, nb), 507 (int32_t)-1, level - 1, 508 &blkcount); 509 if (error) 510 allerror = error; 511 blocksreleased += blkcount; 512 } 513 ext2fs_blkfree(ip, nb); 514 blocksreleased += nblocks; 515 } 516 517 /* 518 * Recursively free last partial block. 519 */ 520 if (level > SINGLE && lastbn >= 0) { 521 last = lastbn % factor; 522 nb = fs2h32(bap[i]); 523 if (nb != 0) { 524 error = ext2fs_indirtrunc(ip, nlbn, fsbtodb(fs, nb), 525 last, level - 1, &blkcount); 526 if (error) 527 allerror = error; 528 blocksreleased += blkcount; 529 } 530 } 531 532 if (copy != NULL) { 533 free(copy, M_TEMP); 534 } else { 535 bp->b_flags |= B_INVAL; 536 brelse(bp); 537 } 538 539 *countp = blocksreleased; 540 return (allerror); 541 } 542