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sys/ufs/ffs/ffs_vnops.c
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1 /*- 2 * Copyright (c) 2002, 2003 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project by Marshall 6 * Kirk McKusick and Network Associates Laboratories, the Security 7 * Research Division of Network Associates, Inc. under DARPA/SPAWAR 8 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS 9 * research program 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * Copyright (c) 1982, 1986, 1989, 1993 33 * The Regents of the University of California. All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 4. Neither the name of the University nor the names of its contributors 44 * may be used to endorse or promote products derived from this software 45 * without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 50 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 57 * SUCH DAMAGE. 58 * 59 * from: @(#)ufs_readwrite.c 8.11 (Berkeley) 5/8/95 60 * from: $FreeBSD: .../ufs/ufs_readwrite.c,v 1.96 2002/08/12 09:22:11 phk ... 61 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95 62 */ 63 64 #include <sys/cdefs.h> 65 __FBSDID("$FreeBSD$"); 66 67 #include <sys/param.h> 68 #include <sys/bio.h> 69 #include <sys/systm.h> 70 #include <sys/buf.h> 71 #include <sys/conf.h> 72 #include <sys/extattr.h> 73 #include <sys/kernel.h> 74 #include <sys/limits.h> 75 #include <sys/malloc.h> 76 #include <sys/mount.h> 77 #include <sys/priv.h> 78 #include <sys/rwlock.h> 79 #include <sys/stat.h> 80 #include <sys/sysctl.h> 81 #include <sys/vmmeter.h> 82 #include <sys/vnode.h> 83 84 #include <vm/vm.h> 85 #include <vm/vm_param.h> 86 #include <vm/vm_extern.h> 87 #include <vm/vm_object.h> 88 #include <vm/vm_page.h> 89 #include <vm/vm_pager.h> 90 #include <vm/vnode_pager.h> 91 92 #include <ufs/ufs/extattr.h> 93 #include <ufs/ufs/quota.h> 94 #include <ufs/ufs/inode.h> 95 #include <ufs/ufs/ufs_extern.h> 96 #include <ufs/ufs/ufsmount.h> 97 98 #include <ufs/ffs/fs.h> 99 #include <ufs/ffs/ffs_extern.h> 100 #include "opt_directio.h" 101 #include "opt_ffs.h" 102 103 #ifdef DIRECTIO 104 extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone); 105 #endif 106 static vop_fdatasync_t ffs_fdatasync; 107 static vop_fsync_t ffs_fsync; 108 static vop_getpages_t ffs_getpages; 109 static vop_lock1_t ffs_lock; 110 static vop_read_t ffs_read; 111 static vop_write_t ffs_write; 112 static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag); 113 static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, 114 struct ucred *cred); 115 static vop_strategy_t ffsext_strategy; 116 static vop_closeextattr_t ffs_closeextattr; 117 static vop_deleteextattr_t ffs_deleteextattr; 118 static vop_getextattr_t ffs_getextattr; 119 static vop_listextattr_t ffs_listextattr; 120 static vop_openextattr_t ffs_openextattr; 121 static vop_setextattr_t ffs_setextattr; 122 static vop_vptofh_t ffs_vptofh; 123 124 /* Global vfs data structures for ufs. */ 125 struct vop_vector ffs_vnodeops1 = { 126 .vop_default = &ufs_vnodeops, 127 .vop_fsync = ffs_fsync, 128 .vop_fdatasync = ffs_fdatasync, 129 .vop_getpages = ffs_getpages, 130 .vop_getpages_async = vnode_pager_local_getpages_async, 131 .vop_lock1 = ffs_lock, 132 .vop_read = ffs_read, 133 .vop_reallocblks = ffs_reallocblks, 134 .vop_write = ffs_write, 135 .vop_vptofh = ffs_vptofh, 136 }; 137 138 struct vop_vector ffs_fifoops1 = { 139 .vop_default = &ufs_fifoops, 140 .vop_fsync = ffs_fsync, 141 .vop_fdatasync = ffs_fdatasync, 142 .vop_reallocblks = ffs_reallocblks, /* XXX: really ??? */ 143 .vop_vptofh = ffs_vptofh, 144 }; 145 146 /* Global vfs data structures for ufs. */ 147 struct vop_vector ffs_vnodeops2 = { 148 .vop_default = &ufs_vnodeops, 149 .vop_fsync = ffs_fsync, 150 .vop_fdatasync = ffs_fdatasync, 151 .vop_getpages = ffs_getpages, 152 .vop_getpages_async = vnode_pager_local_getpages_async, 153 .vop_lock1 = ffs_lock, 154 .vop_read = ffs_read, 155 .vop_reallocblks = ffs_reallocblks, 156 .vop_write = ffs_write, 157 .vop_closeextattr = ffs_closeextattr, 158 .vop_deleteextattr = ffs_deleteextattr, 159 .vop_getextattr = ffs_getextattr, 160 .vop_listextattr = ffs_listextattr, 161 .vop_openextattr = ffs_openextattr, 162 .vop_setextattr = ffs_setextattr, 163 .vop_vptofh = ffs_vptofh, 164 }; 165 166 struct vop_vector ffs_fifoops2 = { 167 .vop_default = &ufs_fifoops, 168 .vop_fsync = ffs_fsync, 169 .vop_fdatasync = ffs_fdatasync, 170 .vop_lock1 = ffs_lock, 171 .vop_reallocblks = ffs_reallocblks, 172 .vop_strategy = ffsext_strategy, 173 .vop_closeextattr = ffs_closeextattr, 174 .vop_deleteextattr = ffs_deleteextattr, 175 .vop_getextattr = ffs_getextattr, 176 .vop_listextattr = ffs_listextattr, 177 .vop_openextattr = ffs_openextattr, 178 .vop_setextattr = ffs_setextattr, 179 .vop_vptofh = ffs_vptofh, 180 }; 181 182 /* 183 * Synch an open file. 184 */ 185 /* ARGSUSED */ 186 static int 187 ffs_fsync(struct vop_fsync_args *ap) 188 { 189 struct vnode *vp; 190 struct bufobj *bo; 191 int error; 192 193 vp = ap->a_vp; 194 bo = &vp->v_bufobj; 195 retry: 196 error = ffs_syncvnode(vp, ap->a_waitfor, 0); 197 if (error) 198 return (error); 199 if (ap->a_waitfor == MNT_WAIT && DOINGSOFTDEP(vp)) { 200 error = softdep_fsync(vp); 201 if (error) 202 return (error); 203 204 /* 205 * The softdep_fsync() function may drop vp lock, 206 * allowing for dirty buffers to reappear on the 207 * bo_dirty list. Recheck and resync as needed. 208 */ 209 BO_LOCK(bo); 210 if ((vp->v_type == VREG || vp->v_type == VDIR) && 211 (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0)) { 212 BO_UNLOCK(bo); 213 goto retry; 214 } 215 BO_UNLOCK(bo); 216 } 217 return (0); 218 } 219 220 int 221 ffs_syncvnode(struct vnode *vp, int waitfor, int flags) 222 { 223 struct inode *ip; 224 struct bufobj *bo; 225 struct buf *bp, *nbp; 226 ufs_lbn_t lbn; 227 int error, passes; 228 bool still_dirty, wait; 229 230 ip = VTOI(vp); 231 ip->i_flag &= ~IN_NEEDSYNC; 232 bo = &vp->v_bufobj; 233 234 /* 235 * When doing MNT_WAIT we must first flush all dependencies 236 * on the inode. 237 */ 238 if (DOINGSOFTDEP(vp) && waitfor == MNT_WAIT && 239 (error = softdep_sync_metadata(vp)) != 0) 240 return (error); 241 242 /* 243 * Flush all dirty buffers associated with a vnode. 244 */ 245 error = 0; 246 passes = 0; 247 wait = false; /* Always do an async pass first. */ 248 lbn = lblkno(ITOFS(ip), (ip->i_size + ITOFS(ip)->fs_bsize - 1)); 249 BO_LOCK(bo); 250 loop: 251 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 252 bp->b_vflags &= ~BV_SCANNED; 253 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 254 /* 255 * Reasons to skip this buffer: it has already been considered 256 * on this pass, the buffer has dependencies that will cause 257 * it to be redirtied and it has not already been deferred, 258 * or it is already being written. 259 */ 260 if ((bp->b_vflags & BV_SCANNED) != 0) 261 continue; 262 bp->b_vflags |= BV_SCANNED; 263 /* 264 * Flush indirects in order, if requested. 265 * 266 * Note that if only datasync is requested, we can 267 * skip indirect blocks when softupdates are not 268 * active. Otherwise we must flush them with data, 269 * since dependencies prevent data block writes. 270 */ 271 if (waitfor == MNT_WAIT && bp->b_lblkno <= -NDADDR && 272 (lbn_level(bp->b_lblkno) >= passes || 273 ((flags & DATA_ONLY) != 0 && !DOINGSOFTDEP(vp)))) 274 continue; 275 if (bp->b_lblkno > lbn) 276 panic("ffs_syncvnode: syncing truncated data."); 277 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL) == 0) { 278 BO_UNLOCK(bo); 279 } else if (wait) { 280 if (BUF_LOCK(bp, 281 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 282 BO_LOCKPTR(bo)) != 0) { 283 bp->b_vflags &= ~BV_SCANNED; 284 goto next; 285 } 286 } else 287 continue; 288 if ((bp->b_flags & B_DELWRI) == 0) 289 panic("ffs_fsync: not dirty"); 290 /* 291 * Check for dependencies and potentially complete them. 292 */ 293 if (!LIST_EMPTY(&bp->b_dep) && 294 (error = softdep_sync_buf(vp, bp, 295 wait ? MNT_WAIT : MNT_NOWAIT)) != 0) { 296 /* I/O error. */ 297 if (error != EBUSY) { 298 BUF_UNLOCK(bp); 299 return (error); 300 } 301 /* If we deferred once, don't defer again. */ 302 if ((bp->b_flags & B_DEFERRED) == 0) { 303 bp->b_flags |= B_DEFERRED; 304 BUF_UNLOCK(bp); 305 goto next; 306 } 307 } 308 if (wait) { 309 bremfree(bp); 310 if ((error = bwrite(bp)) != 0) 311 return (error); 312 } else if ((bp->b_flags & B_CLUSTEROK)) { 313 (void) vfs_bio_awrite(bp); 314 } else { 315 bremfree(bp); 316 (void) bawrite(bp); 317 } 318 next: 319 /* 320 * Since we may have slept during the I/O, we need 321 * to start from a known point. 322 */ 323 BO_LOCK(bo); 324 nbp = TAILQ_FIRST(&bo->bo_dirty.bv_hd); 325 } 326 if (waitfor != MNT_WAIT) { 327 BO_UNLOCK(bo); 328 if ((flags & NO_INO_UPDT) != 0) 329 return (0); 330 else 331 return (ffs_update(vp, 0)); 332 } 333 /* Drain IO to see if we're done. */ 334 bufobj_wwait(bo, 0, 0); 335 /* 336 * Block devices associated with filesystems may have new I/O 337 * requests posted for them even if the vnode is locked, so no 338 * amount of trying will get them clean. We make several passes 339 * as a best effort. 340 * 341 * Regular files may need multiple passes to flush all dependency 342 * work as it is possible that we must write once per indirect 343 * level, once for the leaf, and once for the inode and each of 344 * these will be done with one sync and one async pass. 345 */ 346 if (bo->bo_dirty.bv_cnt > 0) { 347 if ((flags & DATA_ONLY) == 0) { 348 still_dirty = true; 349 } else { 350 /* 351 * For data-only sync, dirty indirect buffers 352 * are ignored. 353 */ 354 still_dirty = false; 355 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 356 if (bp->b_lblkno > -NDADDR) { 357 still_dirty = true; 358 break; 359 } 360 } 361 } 362 363 if (still_dirty) { 364 /* Write the inode after sync passes to flush deps. */ 365 if (wait && DOINGSOFTDEP(vp) && 366 (flags & NO_INO_UPDT) == 0) { 367 BO_UNLOCK(bo); 368 ffs_update(vp, 1); 369 BO_LOCK(bo); 370 } 371 /* switch between sync/async. */ 372 wait = !wait; 373 if (wait || ++passes < NIADDR + 2) 374 goto loop; 375 #ifdef INVARIANTS 376 if (!vn_isdisk(vp, NULL)) 377 vn_printf(vp, "ffs_fsync: dirty "); 378 #endif 379 } 380 } 381 BO_UNLOCK(bo); 382 error = 0; 383 if ((flags & DATA_ONLY) == 0) { 384 if ((flags & NO_INO_UPDT) == 0) 385 error = ffs_update(vp, 1); 386 if (DOINGSUJ(vp)) 387 softdep_journal_fsync(VTOI(vp)); 388 } else if ((ip->i_flags & (IN_SIZEMOD | IN_IBLKDATA)) != 0) { 389 error = ffs_update(vp, 1); 390 } 391 return (error); 392 } 393 394 static int 395 ffs_fdatasync(struct vop_fdatasync_args *ap) 396 { 397 398 return (ffs_syncvnode(ap->a_vp, MNT_WAIT, DATA_ONLY)); 399 } 400 401 static int 402 ffs_lock(ap) 403 struct vop_lock1_args /* { 404 struct vnode *a_vp; 405 int a_flags; 406 struct thread *a_td; 407 char *file; 408 int line; 409 } */ *ap; 410 { 411 #ifndef NO_FFS_SNAPSHOT 412 struct vnode *vp; 413 int flags; 414 struct lock *lkp; 415 int result; 416 417 switch (ap->a_flags & LK_TYPE_MASK) { 418 case LK_SHARED: 419 case LK_UPGRADE: 420 case LK_EXCLUSIVE: 421 vp = ap->a_vp; 422 flags = ap->a_flags; 423 for (;;) { 424 #ifdef DEBUG_VFS_LOCKS 425 KASSERT(vp->v_holdcnt != 0, 426 ("ffs_lock %p: zero hold count", vp)); 427 #endif 428 lkp = vp->v_vnlock; 429 result = _lockmgr_args(lkp, flags, VI_MTX(vp), 430 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, 431 ap->a_file, ap->a_line); 432 if (lkp == vp->v_vnlock || result != 0) 433 break; 434 /* 435 * Apparent success, except that the vnode 436 * mutated between snapshot file vnode and 437 * regular file vnode while this process 438 * slept. The lock currently held is not the 439 * right lock. Release it, and try to get the 440 * new lock. 441 */ 442 (void) _lockmgr_args(lkp, LK_RELEASE, NULL, 443 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, 444 ap->a_file, ap->a_line); 445 if ((flags & (LK_INTERLOCK | LK_NOWAIT)) == 446 (LK_INTERLOCK | LK_NOWAIT)) 447 return (EBUSY); 448 if ((flags & LK_TYPE_MASK) == LK_UPGRADE) 449 flags = (flags & ~LK_TYPE_MASK) | LK_EXCLUSIVE; 450 flags &= ~LK_INTERLOCK; 451 } 452 break; 453 default: 454 result = VOP_LOCK1_APV(&ufs_vnodeops, ap); 455 } 456 return (result); 457 #else 458 return (VOP_LOCK1_APV(&ufs_vnodeops, ap)); 459 #endif 460 } 461 462 /* 463 * Vnode op for reading. 464 */ 465 static int 466 ffs_read(ap) 467 struct vop_read_args /* { 468 struct vnode *a_vp; 469 struct uio *a_uio; 470 int a_ioflag; 471 struct ucred *a_cred; 472 } */ *ap; 473 { 474 struct vnode *vp; 475 struct inode *ip; 476 struct uio *uio; 477 struct fs *fs; 478 struct buf *bp; 479 ufs_lbn_t lbn, nextlbn; 480 off_t bytesinfile; 481 long size, xfersize, blkoffset; 482 ssize_t orig_resid; 483 int error; 484 int seqcount; 485 int ioflag; 486 487 vp = ap->a_vp; 488 uio = ap->a_uio; 489 ioflag = ap->a_ioflag; 490 if (ap->a_ioflag & IO_EXT) 491 #ifdef notyet 492 return (ffs_extread(vp, uio, ioflag)); 493 #else 494 panic("ffs_read+IO_EXT"); 495 #endif 496 #ifdef DIRECTIO 497 if ((ioflag & IO_DIRECT) != 0) { 498 int workdone; 499 500 error = ffs_rawread(vp, uio, &workdone); 501 if (error != 0 || workdone != 0) 502 return error; 503 } 504 #endif 505 506 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 507 ip = VTOI(vp); 508 509 #ifdef INVARIANTS 510 if (uio->uio_rw != UIO_READ) 511 panic("ffs_read: mode"); 512 513 if (vp->v_type == VLNK) { 514 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 515 panic("ffs_read: short symlink"); 516 } else if (vp->v_type != VREG && vp->v_type != VDIR) 517 panic("ffs_read: type %d", vp->v_type); 518 #endif 519 orig_resid = uio->uio_resid; 520 KASSERT(orig_resid >= 0, ("ffs_read: uio->uio_resid < 0")); 521 if (orig_resid == 0) 522 return (0); 523 KASSERT(uio->uio_offset >= 0, ("ffs_read: uio->uio_offset < 0")); 524 fs = ITOFS(ip); 525 if (uio->uio_offset < ip->i_size && 526 uio->uio_offset >= fs->fs_maxfilesize) 527 return (EOVERFLOW); 528 529 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 530 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 531 break; 532 lbn = lblkno(fs, uio->uio_offset); 533 nextlbn = lbn + 1; 534 535 /* 536 * size of buffer. The buffer representing the 537 * end of the file is rounded up to the size of 538 * the block type ( fragment or full block, 539 * depending ). 540 */ 541 size = blksize(fs, ip, lbn); 542 blkoffset = blkoff(fs, uio->uio_offset); 543 544 /* 545 * The amount we want to transfer in this iteration is 546 * one FS block less the amount of the data before 547 * our startpoint (duh!) 548 */ 549 xfersize = fs->fs_bsize - blkoffset; 550 551 /* 552 * But if we actually want less than the block, 553 * or the file doesn't have a whole block more of data, 554 * then use the lesser number. 555 */ 556 if (uio->uio_resid < xfersize) 557 xfersize = uio->uio_resid; 558 if (bytesinfile < xfersize) 559 xfersize = bytesinfile; 560 561 if (lblktosize(fs, nextlbn) >= ip->i_size) { 562 /* 563 * Don't do readahead if this is the end of the file. 564 */ 565 error = bread_gb(vp, lbn, size, NOCRED, 566 GB_UNMAPPED, &bp); 567 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 568 /* 569 * Otherwise if we are allowed to cluster, 570 * grab as much as we can. 571 * 572 * XXX This may not be a win if we are not 573 * doing sequential access. 574 */ 575 error = cluster_read(vp, ip->i_size, lbn, 576 size, NOCRED, blkoffset + uio->uio_resid, 577 seqcount, GB_UNMAPPED, &bp); 578 } else if (seqcount > 1) { 579 /* 580 * If we are NOT allowed to cluster, then 581 * if we appear to be acting sequentially, 582 * fire off a request for a readahead 583 * as well as a read. Note that the 4th and 5th 584 * arguments point to arrays of the size specified in 585 * the 6th argument. 586 */ 587 u_int nextsize = blksize(fs, ip, nextlbn); 588 error = breadn_flags(vp, lbn, size, &nextlbn, 589 &nextsize, 1, NOCRED, GB_UNMAPPED, &bp); 590 } else { 591 /* 592 * Failing all of the above, just read what the 593 * user asked for. Interestingly, the same as 594 * the first option above. 595 */ 596 error = bread_gb(vp, lbn, size, NOCRED, 597 GB_UNMAPPED, &bp); 598 } 599 if (error) { 600 brelse(bp); 601 bp = NULL; 602 break; 603 } 604 605 /* 606 * We should only get non-zero b_resid when an I/O error 607 * has occurred, which should cause us to break above. 608 * However, if the short read did not cause an error, 609 * then we want to ensure that we do not uiomove bad 610 * or uninitialized data. 611 */ 612 size -= bp->b_resid; 613 if (size < xfersize) { 614 if (size == 0) 615 break; 616 xfersize = size; 617 } 618 619 if (buf_mapped(bp)) { 620 error = vn_io_fault_uiomove((char *)bp->b_data + 621 blkoffset, (int)xfersize, uio); 622 } else { 623 error = vn_io_fault_pgmove(bp->b_pages, blkoffset, 624 (int)xfersize, uio); 625 } 626 if (error) 627 break; 628 629 vfs_bio_brelse(bp, ioflag); 630 } 631 632 /* 633 * This can only happen in the case of an error 634 * because the loop above resets bp to NULL on each iteration 635 * and on normal completion has not set a new value into it. 636 * so it must have come from a 'break' statement 637 */ 638 if (bp != NULL) 639 vfs_bio_brelse(bp, ioflag); 640 641 if ((error == 0 || uio->uio_resid != orig_resid) && 642 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0 && 643 (ip->i_flag & IN_ACCESS) == 0) { 644 VI_LOCK(vp); 645 ip->i_flag |= IN_ACCESS; 646 VI_UNLOCK(vp); 647 } 648 return (error); 649 } 650 651 /* 652 * Vnode op for writing. 653 */ 654 static int 655 ffs_write(ap) 656 struct vop_write_args /* { 657 struct vnode *a_vp; 658 struct uio *a_uio; 659 int a_ioflag; 660 struct ucred *a_cred; 661 } */ *ap; 662 { 663 struct vnode *vp; 664 struct uio *uio; 665 struct inode *ip; 666 struct fs *fs; 667 struct buf *bp; 668 ufs_lbn_t lbn; 669 off_t osize; 670 ssize_t resid; 671 int seqcount; 672 int blkoffset, error, flags, ioflag, size, xfersize; 673 674 vp = ap->a_vp; 675 uio = ap->a_uio; 676 ioflag = ap->a_ioflag; 677 if (ap->a_ioflag & IO_EXT) 678 #ifdef notyet 679 return (ffs_extwrite(vp, uio, ioflag, ap->a_cred)); 680 #else 681 panic("ffs_write+IO_EXT"); 682 #endif 683 684 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 685 ip = VTOI(vp); 686 687 #ifdef INVARIANTS 688 if (uio->uio_rw != UIO_WRITE) 689 panic("ffs_write: mode"); 690 #endif 691 692 switch (vp->v_type) { 693 case VREG: 694 if (ioflag & IO_APPEND) 695 uio->uio_offset = ip->i_size; 696 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 697 return (EPERM); 698 /* FALLTHROUGH */ 699 case VLNK: 700 break; 701 case VDIR: 702 panic("ffs_write: dir write"); 703 break; 704 default: 705 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type, 706 (int)uio->uio_offset, 707 (int)uio->uio_resid 708 ); 709 } 710 711 KASSERT(uio->uio_resid >= 0, ("ffs_write: uio->uio_resid < 0")); 712 KASSERT(uio->uio_offset >= 0, ("ffs_write: uio->uio_offset < 0")); 713 fs = ITOFS(ip); 714 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) 715 return (EFBIG); 716 /* 717 * Maybe this should be above the vnode op call, but so long as 718 * file servers have no limits, I don't think it matters. 719 */ 720 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 721 return (EFBIG); 722 723 resid = uio->uio_resid; 724 osize = ip->i_size; 725 if (seqcount > BA_SEQMAX) 726 flags = BA_SEQMAX << BA_SEQSHIFT; 727 else 728 flags = seqcount << BA_SEQSHIFT; 729 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 730 flags |= IO_SYNC; 731 flags |= BA_UNMAPPED; 732 733 for (error = 0; uio->uio_resid > 0;) { 734 lbn = lblkno(fs, uio->uio_offset); 735 blkoffset = blkoff(fs, uio->uio_offset); 736 xfersize = fs->fs_bsize - blkoffset; 737 if (uio->uio_resid < xfersize) 738 xfersize = uio->uio_resid; 739 if (uio->uio_offset + xfersize > ip->i_size) 740 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 741 742 /* 743 * We must perform a read-before-write if the transfer size 744 * does not cover the entire buffer. 745 */ 746 if (fs->fs_bsize > xfersize) 747 flags |= BA_CLRBUF; 748 else 749 flags &= ~BA_CLRBUF; 750 /* XXX is uio->uio_offset the right thing here? */ 751 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 752 ap->a_cred, flags, &bp); 753 if (error != 0) { 754 vnode_pager_setsize(vp, ip->i_size); 755 break; 756 } 757 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 758 bp->b_flags |= B_NOCACHE; 759 760 if (uio->uio_offset + xfersize > ip->i_size) { 761 ip->i_size = uio->uio_offset + xfersize; 762 DIP_SET(ip, i_size, ip->i_size); 763 ip->i_flag |= IN_SIZEMOD | IN_CHANGE; 764 } 765 766 size = blksize(fs, ip, lbn) - bp->b_resid; 767 if (size < xfersize) 768 xfersize = size; 769 770 if (buf_mapped(bp)) { 771 error = vn_io_fault_uiomove((char *)bp->b_data + 772 blkoffset, (int)xfersize, uio); 773 } else { 774 error = vn_io_fault_pgmove(bp->b_pages, blkoffset, 775 (int)xfersize, uio); 776 } 777 /* 778 * If the buffer is not already filled and we encounter an 779 * error while trying to fill it, we have to clear out any 780 * garbage data from the pages instantiated for the buffer. 781 * If we do not, a failed uiomove() during a write can leave 782 * the prior contents of the pages exposed to a userland mmap. 783 * 784 * Note that we need only clear buffers with a transfer size 785 * equal to the block size because buffers with a shorter 786 * transfer size were cleared above by the call to UFS_BALLOC() 787 * with the BA_CLRBUF flag set. 788 * 789 * If the source region for uiomove identically mmaps the 790 * buffer, uiomove() performed the NOP copy, and the buffer 791 * content remains valid because the page fault handler 792 * validated the pages. 793 */ 794 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 795 fs->fs_bsize == xfersize) 796 vfs_bio_clrbuf(bp); 797 798 vfs_bio_set_flags(bp, ioflag); 799 800 /* 801 * If IO_SYNC each buffer is written synchronously. Otherwise 802 * if we have a severe page deficiency write the buffer 803 * asynchronously. Otherwise try to cluster, and if that 804 * doesn't do it then either do an async write (if O_DIRECT), 805 * or a delayed write (if not). 806 */ 807 if (ioflag & IO_SYNC) { 808 (void)bwrite(bp); 809 } else if (vm_page_count_severe() || 810 buf_dirty_count_severe() || 811 (ioflag & IO_ASYNC)) { 812 bp->b_flags |= B_CLUSTEROK; 813 bawrite(bp); 814 } else if (xfersize + blkoffset == fs->fs_bsize) { 815 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 816 bp->b_flags |= B_CLUSTEROK; 817 cluster_write(vp, bp, ip->i_size, seqcount, 818 GB_UNMAPPED); 819 } else { 820 bawrite(bp); 821 } 822 } else if (ioflag & IO_DIRECT) { 823 bp->b_flags |= B_CLUSTEROK; 824 bawrite(bp); 825 } else { 826 bp->b_flags |= B_CLUSTEROK; 827 bdwrite(bp); 828 } 829 if (error || xfersize == 0) 830 break; 831 ip->i_flag |= IN_CHANGE | IN_UPDATE; 832 } 833 /* 834 * If we successfully wrote any data, and we are not the superuser 835 * we clear the setuid and setgid bits as a precaution against 836 * tampering. 837 */ 838 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 839 ap->a_cred) { 840 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) { 841 ip->i_mode &= ~(ISUID | ISGID); 842 DIP_SET(ip, i_mode, ip->i_mode); 843 } 844 } 845 if (error) { 846 if (ioflag & IO_UNIT) { 847 (void)ffs_truncate(vp, osize, 848 IO_NORMAL | (ioflag & IO_SYNC), ap->a_cred); 849 uio->uio_offset -= resid - uio->uio_resid; 850 uio->uio_resid = resid; 851 } 852 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 853 error = ffs_update(vp, 1); 854 return (error); 855 } 856 857 /* 858 * Extended attribute area reading. 859 */ 860 static int 861 ffs_extread(struct vnode *vp, struct uio *uio, int ioflag) 862 { 863 struct inode *ip; 864 struct ufs2_dinode *dp; 865 struct fs *fs; 866 struct buf *bp; 867 ufs_lbn_t lbn, nextlbn; 868 off_t bytesinfile; 869 long size, xfersize, blkoffset; 870 ssize_t orig_resid; 871 int error; 872 873 ip = VTOI(vp); 874 fs = ITOFS(ip); 875 dp = ip->i_din2; 876 877 #ifdef INVARIANTS 878 if (uio->uio_rw != UIO_READ || fs->fs_magic != FS_UFS2_MAGIC) 879 panic("ffs_extread: mode"); 880 881 #endif 882 orig_resid = uio->uio_resid; 883 KASSERT(orig_resid >= 0, ("ffs_extread: uio->uio_resid < 0")); 884 if (orig_resid == 0) 885 return (0); 886 KASSERT(uio->uio_offset >= 0, ("ffs_extread: uio->uio_offset < 0")); 887 888 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 889 if ((bytesinfile = dp->di_extsize - uio->uio_offset) <= 0) 890 break; 891 lbn = lblkno(fs, uio->uio_offset); 892 nextlbn = lbn + 1; 893 894 /* 895 * size of buffer. The buffer representing the 896 * end of the file is rounded up to the size of 897 * the block type ( fragment or full block, 898 * depending ). 899 */ 900 size = sblksize(fs, dp->di_extsize, lbn); 901 blkoffset = blkoff(fs, uio->uio_offset); 902 903 /* 904 * The amount we want to transfer in this iteration is 905 * one FS block less the amount of the data before 906 * our startpoint (duh!) 907 */ 908 xfersize = fs->fs_bsize - blkoffset; 909 910 /* 911 * But if we actually want less than the block, 912 * or the file doesn't have a whole block more of data, 913 * then use the lesser number. 914 */ 915 if (uio->uio_resid < xfersize) 916 xfersize = uio->uio_resid; 917 if (bytesinfile < xfersize) 918 xfersize = bytesinfile; 919 920 if (lblktosize(fs, nextlbn) >= dp->di_extsize) { 921 /* 922 * Don't do readahead if this is the end of the info. 923 */ 924 error = bread(vp, -1 - lbn, size, NOCRED, &bp); 925 } else { 926 /* 927 * If we have a second block, then 928 * fire off a request for a readahead 929 * as well as a read. Note that the 4th and 5th 930 * arguments point to arrays of the size specified in 931 * the 6th argument. 932 */ 933 u_int nextsize = sblksize(fs, dp->di_extsize, nextlbn); 934 935 nextlbn = -1 - nextlbn; 936 error = breadn(vp, -1 - lbn, 937 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 938 } 939 if (error) { 940 brelse(bp); 941 bp = NULL; 942 break; 943 } 944 945 /* 946 * We should only get non-zero b_resid when an I/O error 947 * has occurred, which should cause us to break above. 948 * However, if the short read did not cause an error, 949 * then we want to ensure that we do not uiomove bad 950 * or uninitialized data. 951 */ 952 size -= bp->b_resid; 953 if (size < xfersize) { 954 if (size == 0) 955 break; 956 xfersize = size; 957 } 958 959 error = uiomove((char *)bp->b_data + blkoffset, 960 (int)xfersize, uio); 961 if (error) 962 break; 963 vfs_bio_brelse(bp, ioflag); 964 } 965 966 /* 967 * This can only happen in the case of an error 968 * because the loop above resets bp to NULL on each iteration 969 * and on normal completion has not set a new value into it. 970 * so it must have come from a 'break' statement 971 */ 972 if (bp != NULL) 973 vfs_bio_brelse(bp, ioflag); 974 return (error); 975 } 976 977 /* 978 * Extended attribute area writing. 979 */ 980 static int 981 ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred) 982 { 983 struct inode *ip; 984 struct ufs2_dinode *dp; 985 struct fs *fs; 986 struct buf *bp; 987 ufs_lbn_t lbn; 988 off_t osize; 989 ssize_t resid; 990 int blkoffset, error, flags, size, xfersize; 991 992 ip = VTOI(vp); 993 fs = ITOFS(ip); 994 dp = ip->i_din2; 995 996 #ifdef INVARIANTS 997 if (uio->uio_rw != UIO_WRITE || fs->fs_magic != FS_UFS2_MAGIC) 998 panic("ffs_extwrite: mode"); 999 #endif 1000 1001 if (ioflag & IO_APPEND) 1002 uio->uio_offset = dp->di_extsize; 1003 KASSERT(uio->uio_offset >= 0, ("ffs_extwrite: uio->uio_offset < 0")); 1004 KASSERT(uio->uio_resid >= 0, ("ffs_extwrite: uio->uio_resid < 0")); 1005 if ((uoff_t)uio->uio_offset + uio->uio_resid > NXADDR * fs->fs_bsize) 1006 return (EFBIG); 1007 1008 resid = uio->uio_resid; 1009 osize = dp->di_extsize; 1010 flags = IO_EXT; 1011 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1012 flags |= IO_SYNC; 1013 1014 for (error = 0; uio->uio_resid > 0;) { 1015 lbn = lblkno(fs, uio->uio_offset); 1016 blkoffset = blkoff(fs, uio->uio_offset); 1017 xfersize = fs->fs_bsize - blkoffset; 1018 if (uio->uio_resid < xfersize) 1019 xfersize = uio->uio_resid; 1020 1021 /* 1022 * We must perform a read-before-write if the transfer size 1023 * does not cover the entire buffer. 1024 */ 1025 if (fs->fs_bsize > xfersize) 1026 flags |= BA_CLRBUF; 1027 else 1028 flags &= ~BA_CLRBUF; 1029 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 1030 ucred, flags, &bp); 1031 if (error != 0) 1032 break; 1033 /* 1034 * If the buffer is not valid we have to clear out any 1035 * garbage data from the pages instantiated for the buffer. 1036 * If we do not, a failed uiomove() during a write can leave 1037 * the prior contents of the pages exposed to a userland 1038 * mmap(). XXX deal with uiomove() errors a better way. 1039 */ 1040 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 1041 vfs_bio_clrbuf(bp); 1042 1043 if (uio->uio_offset + xfersize > dp->di_extsize) { 1044 dp->di_extsize = uio->uio_offset + xfersize; 1045 ip->i_flag |= IN_SIZEMOD | IN_CHANGE; 1046 } 1047 1048 size = sblksize(fs, dp->di_extsize, lbn) - bp->b_resid; 1049 if (size < xfersize) 1050 xfersize = size; 1051 1052 error = 1053 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1054 1055 vfs_bio_set_flags(bp, ioflag); 1056 1057 /* 1058 * If IO_SYNC each buffer is written synchronously. Otherwise 1059 * if we have a severe page deficiency write the buffer 1060 * asynchronously. Otherwise try to cluster, and if that 1061 * doesn't do it then either do an async write (if O_DIRECT), 1062 * or a delayed write (if not). 1063 */ 1064 if (ioflag & IO_SYNC) { 1065 (void)bwrite(bp); 1066 } else if (vm_page_count_severe() || 1067 buf_dirty_count_severe() || 1068 xfersize + blkoffset == fs->fs_bsize || 1069 (ioflag & (IO_ASYNC | IO_DIRECT))) 1070 bawrite(bp); 1071 else 1072 bdwrite(bp); 1073 if (error || xfersize == 0) 1074 break; 1075 ip->i_flag |= IN_CHANGE; 1076 } 1077 /* 1078 * If we successfully wrote any data, and we are not the superuser 1079 * we clear the setuid and setgid bits as a precaution against 1080 * tampering. 1081 */ 1082 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && ucred) { 1083 if (priv_check_cred(ucred, PRIV_VFS_RETAINSUGID, 0)) { 1084 ip->i_mode &= ~(ISUID | ISGID); 1085 dp->di_mode = ip->i_mode; 1086 } 1087 } 1088 if (error) { 1089 if (ioflag & IO_UNIT) { 1090 (void)ffs_truncate(vp, osize, 1091 IO_EXT | (ioflag&IO_SYNC), ucred); 1092 uio->uio_offset -= resid - uio->uio_resid; 1093 uio->uio_resid = resid; 1094 } 1095 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 1096 error = ffs_update(vp, 1); 1097 return (error); 1098 } 1099 1100 1101 /* 1102 * Vnode operating to retrieve a named extended attribute. 1103 * 1104 * Locate a particular EA (nspace:name) in the area (ptr:length), and return 1105 * the length of the EA, and possibly the pointer to the entry and to the data. 1106 */ 1107 static int 1108 ffs_findextattr(u_char *ptr, u_int length, int nspace, const char *name, u_char **eap, u_char **eac) 1109 { 1110 u_char *p, *pe, *pn, *p0; 1111 int eapad1, eapad2, ealength, ealen, nlen; 1112 uint32_t ul; 1113 1114 pe = ptr + length; 1115 nlen = strlen(name); 1116 1117 for (p = ptr; p < pe; p = pn) { 1118 p0 = p; 1119 bcopy(p, &ul, sizeof(ul)); 1120 pn = p + ul; 1121 /* make sure this entry is complete */ 1122 if (pn > pe) 1123 break; 1124 p += sizeof(uint32_t); 1125 if (*p != nspace) 1126 continue; 1127 p++; 1128 eapad2 = *p++; 1129 if (*p != nlen) 1130 continue; 1131 p++; 1132 if (bcmp(p, name, nlen)) 1133 continue; 1134 ealength = sizeof(uint32_t) + 3 + nlen; 1135 eapad1 = 8 - (ealength % 8); 1136 if (eapad1 == 8) 1137 eapad1 = 0; 1138 ealength += eapad1; 1139 ealen = ul - ealength - eapad2; 1140 p += nlen + eapad1; 1141 if (eap != NULL) 1142 *eap = p0; 1143 if (eac != NULL) 1144 *eac = p; 1145 return (ealen); 1146 } 1147 return(-1); 1148 } 1149 1150 static int 1151 ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td, int extra) 1152 { 1153 struct inode *ip; 1154 struct ufs2_dinode *dp; 1155 struct fs *fs; 1156 struct uio luio; 1157 struct iovec liovec; 1158 u_int easize; 1159 int error; 1160 u_char *eae; 1161 1162 ip = VTOI(vp); 1163 fs = ITOFS(ip); 1164 dp = ip->i_din2; 1165 easize = dp->di_extsize; 1166 if ((uoff_t)easize + extra > NXADDR * fs->fs_bsize) 1167 return (EFBIG); 1168 1169 eae = malloc(easize + extra, M_TEMP, M_WAITOK); 1170 1171 liovec.iov_base = eae; 1172 liovec.iov_len = easize; 1173 luio.uio_iov = &liovec; 1174 luio.uio_iovcnt = 1; 1175 luio.uio_offset = 0; 1176 luio.uio_resid = easize; 1177 luio.uio_segflg = UIO_SYSSPACE; 1178 luio.uio_rw = UIO_READ; 1179 luio.uio_td = td; 1180 1181 error = ffs_extread(vp, &luio, IO_EXT | IO_SYNC); 1182 if (error) { 1183 free(eae, M_TEMP); 1184 return(error); 1185 } 1186 *p = eae; 1187 return (0); 1188 } 1189 1190 static void 1191 ffs_lock_ea(struct vnode *vp) 1192 { 1193 struct inode *ip; 1194 1195 ip = VTOI(vp); 1196 VI_LOCK(vp); 1197 while (ip->i_flag & IN_EA_LOCKED) { 1198 ip->i_flag |= IN_EA_LOCKWAIT; 1199 msleep(&ip->i_ea_refs, &vp->v_interlock, PINOD + 2, "ufs_ea", 1200 0); 1201 } 1202 ip->i_flag |= IN_EA_LOCKED; 1203 VI_UNLOCK(vp); 1204 } 1205 1206 static void 1207 ffs_unlock_ea(struct vnode *vp) 1208 { 1209 struct inode *ip; 1210 1211 ip = VTOI(vp); 1212 VI_LOCK(vp); 1213 if (ip->i_flag & IN_EA_LOCKWAIT) 1214 wakeup(&ip->i_ea_refs); 1215 ip->i_flag &= ~(IN_EA_LOCKED | IN_EA_LOCKWAIT); 1216 VI_UNLOCK(vp); 1217 } 1218 1219 static int 1220 ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td) 1221 { 1222 struct inode *ip; 1223 struct ufs2_dinode *dp; 1224 int error; 1225 1226 ip = VTOI(vp); 1227 1228 ffs_lock_ea(vp); 1229 if (ip->i_ea_area != NULL) { 1230 ip->i_ea_refs++; 1231 ffs_unlock_ea(vp); 1232 return (0); 1233 } 1234 dp = ip->i_din2; 1235 error = ffs_rdextattr(&ip->i_ea_area, vp, td, 0); 1236 if (error) { 1237 ffs_unlock_ea(vp); 1238 return (error); 1239 } 1240 ip->i_ea_len = dp->di_extsize; 1241 ip->i_ea_error = 0; 1242 ip->i_ea_refs++; 1243 ffs_unlock_ea(vp); 1244 return (0); 1245 } 1246 1247 /* 1248 * Vnode extattr transaction commit/abort 1249 */ 1250 static int 1251 ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td) 1252 { 1253 struct inode *ip; 1254 struct uio luio; 1255 struct iovec liovec; 1256 int error; 1257 struct ufs2_dinode *dp; 1258 1259 ip = VTOI(vp); 1260 1261 ffs_lock_ea(vp); 1262 if (ip->i_ea_area == NULL) { 1263 ffs_unlock_ea(vp); 1264 return (EINVAL); 1265 } 1266 dp = ip->i_din2; 1267 error = ip->i_ea_error; 1268 if (commit && error == 0) { 1269 ASSERT_VOP_ELOCKED(vp, "ffs_close_ea commit"); 1270 if (cred == NOCRED) 1271 cred = vp->v_mount->mnt_cred; 1272 liovec.iov_base = ip->i_ea_area; 1273 liovec.iov_len = ip->i_ea_len; 1274 luio.uio_iov = &liovec; 1275 luio.uio_iovcnt = 1; 1276 luio.uio_offset = 0; 1277 luio.uio_resid = ip->i_ea_len; 1278 luio.uio_segflg = UIO_SYSSPACE; 1279 luio.uio_rw = UIO_WRITE; 1280 luio.uio_td = td; 1281 /* XXX: I'm not happy about truncating to zero size */ 1282 if (ip->i_ea_len < dp->di_extsize) 1283 error = ffs_truncate(vp, 0, IO_EXT, cred); 1284 error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred); 1285 } 1286 if (--ip->i_ea_refs == 0) { 1287 free(ip->i_ea_area, M_TEMP); 1288 ip->i_ea_area = NULL; 1289 ip->i_ea_len = 0; 1290 ip->i_ea_error = 0; 1291 } 1292 ffs_unlock_ea(vp); 1293 return (error); 1294 } 1295 1296 /* 1297 * Vnode extattr strategy routine for fifos. 1298 * 1299 * We need to check for a read or write of the external attributes. 1300 * Otherwise we just fall through and do the usual thing. 1301 */ 1302 static int 1303 ffsext_strategy(struct vop_strategy_args *ap) 1304 /* 1305 struct vop_strategy_args { 1306 struct vnodeop_desc *a_desc; 1307 struct vnode *a_vp; 1308 struct buf *a_bp; 1309 }; 1310 */ 1311 { 1312 struct vnode *vp; 1313 daddr_t lbn; 1314 1315 vp = ap->a_vp; 1316 lbn = ap->a_bp->b_lblkno; 1317 if (I_IS_UFS2(VTOI(vp)) && lbn < 0 && lbn >= -NXADDR) 1318 return (VOP_STRATEGY_APV(&ufs_vnodeops, ap)); 1319 if (vp->v_type == VFIFO) 1320 return (VOP_STRATEGY_APV(&ufs_fifoops, ap)); 1321 panic("spec nodes went here"); 1322 } 1323 1324 /* 1325 * Vnode extattr transaction commit/abort 1326 */ 1327 static int 1328 ffs_openextattr(struct vop_openextattr_args *ap) 1329 /* 1330 struct vop_openextattr_args { 1331 struct vnodeop_desc *a_desc; 1332 struct vnode *a_vp; 1333 IN struct ucred *a_cred; 1334 IN struct thread *a_td; 1335 }; 1336 */ 1337 { 1338 1339 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1340 return (EOPNOTSUPP); 1341 1342 return (ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td)); 1343 } 1344 1345 1346 /* 1347 * Vnode extattr transaction commit/abort 1348 */ 1349 static int 1350 ffs_closeextattr(struct vop_closeextattr_args *ap) 1351 /* 1352 struct vop_closeextattr_args { 1353 struct vnodeop_desc *a_desc; 1354 struct vnode *a_vp; 1355 int a_commit; 1356 IN struct ucred *a_cred; 1357 IN struct thread *a_td; 1358 }; 1359 */ 1360 { 1361 1362 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1363 return (EOPNOTSUPP); 1364 1365 if (ap->a_commit && (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)) 1366 return (EROFS); 1367 1368 return (ffs_close_ea(ap->a_vp, ap->a_commit, ap->a_cred, ap->a_td)); 1369 } 1370 1371 /* 1372 * Vnode operation to remove a named attribute. 1373 */ 1374 static int 1375 ffs_deleteextattr(struct vop_deleteextattr_args *ap) 1376 /* 1377 vop_deleteextattr { 1378 IN struct vnode *a_vp; 1379 IN int a_attrnamespace; 1380 IN const char *a_name; 1381 IN struct ucred *a_cred; 1382 IN struct thread *a_td; 1383 }; 1384 */ 1385 { 1386 struct inode *ip; 1387 struct fs *fs; 1388 uint32_t ealength, ul; 1389 int ealen, olen, eapad1, eapad2, error, i, easize; 1390 u_char *eae, *p; 1391 1392 ip = VTOI(ap->a_vp); 1393 fs = ITOFS(ip); 1394 1395 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1396 return (EOPNOTSUPP); 1397 1398 if (strlen(ap->a_name) == 0) 1399 return (EINVAL); 1400 1401 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 1402 return (EROFS); 1403 1404 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1405 ap->a_cred, ap->a_td, VWRITE); 1406 if (error) { 1407 1408 /* 1409 * ffs_lock_ea is not needed there, because the vnode 1410 * must be exclusively locked. 1411 */ 1412 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1413 ip->i_ea_error = error; 1414 return (error); 1415 } 1416 1417 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1418 if (error) 1419 return (error); 1420 1421 ealength = eapad1 = ealen = eapad2 = 0; 1422 1423 eae = malloc(ip->i_ea_len, M_TEMP, M_WAITOK); 1424 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1425 easize = ip->i_ea_len; 1426 1427 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1428 &p, NULL); 1429 if (olen == -1) { 1430 /* delete but nonexistent */ 1431 free(eae, M_TEMP); 1432 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1433 return(ENOATTR); 1434 } 1435 bcopy(p, &ul, sizeof ul); 1436 i = p - eae + ul; 1437 if (ul != ealength) { 1438 bcopy(p + ul, p + ealength, easize - i); 1439 easize += (ealength - ul); 1440 } 1441 if (easize > NXADDR * fs->fs_bsize) { 1442 free(eae, M_TEMP); 1443 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1444 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1445 ip->i_ea_error = ENOSPC; 1446 return(ENOSPC); 1447 } 1448 p = ip->i_ea_area; 1449 ip->i_ea_area = eae; 1450 ip->i_ea_len = easize; 1451 free(p, M_TEMP); 1452 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td); 1453 return(error); 1454 } 1455 1456 /* 1457 * Vnode operation to retrieve a named extended attribute. 1458 */ 1459 static int 1460 ffs_getextattr(struct vop_getextattr_args *ap) 1461 /* 1462 vop_getextattr { 1463 IN struct vnode *a_vp; 1464 IN int a_attrnamespace; 1465 IN const char *a_name; 1466 INOUT struct uio *a_uio; 1467 OUT size_t *a_size; 1468 IN struct ucred *a_cred; 1469 IN struct thread *a_td; 1470 }; 1471 */ 1472 { 1473 struct inode *ip; 1474 u_char *eae, *p; 1475 unsigned easize; 1476 int error, ealen; 1477 1478 ip = VTOI(ap->a_vp); 1479 1480 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1481 return (EOPNOTSUPP); 1482 1483 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1484 ap->a_cred, ap->a_td, VREAD); 1485 if (error) 1486 return (error); 1487 1488 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1489 if (error) 1490 return (error); 1491 1492 eae = ip->i_ea_area; 1493 easize = ip->i_ea_len; 1494 1495 ealen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1496 NULL, &p); 1497 if (ealen >= 0) { 1498 error = 0; 1499 if (ap->a_size != NULL) 1500 *ap->a_size = ealen; 1501 else if (ap->a_uio != NULL) 1502 error = uiomove(p, ealen, ap->a_uio); 1503 } else 1504 error = ENOATTR; 1505 1506 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1507 return(error); 1508 } 1509 1510 /* 1511 * Vnode operation to retrieve extended attributes on a vnode. 1512 */ 1513 static int 1514 ffs_listextattr(struct vop_listextattr_args *ap) 1515 /* 1516 vop_listextattr { 1517 IN struct vnode *a_vp; 1518 IN int a_attrnamespace; 1519 INOUT struct uio *a_uio; 1520 OUT size_t *a_size; 1521 IN struct ucred *a_cred; 1522 IN struct thread *a_td; 1523 }; 1524 */ 1525 { 1526 struct inode *ip; 1527 u_char *eae, *p, *pe, *pn; 1528 unsigned easize; 1529 uint32_t ul; 1530 int error, ealen; 1531 1532 ip = VTOI(ap->a_vp); 1533 1534 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1535 return (EOPNOTSUPP); 1536 1537 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1538 ap->a_cred, ap->a_td, VREAD); 1539 if (error) 1540 return (error); 1541 1542 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1543 if (error) 1544 return (error); 1545 eae = ip->i_ea_area; 1546 easize = ip->i_ea_len; 1547 1548 error = 0; 1549 if (ap->a_size != NULL) 1550 *ap->a_size = 0; 1551 pe = eae + easize; 1552 for(p = eae; error == 0 && p < pe; p = pn) { 1553 bcopy(p, &ul, sizeof(ul)); 1554 pn = p + ul; 1555 if (pn > pe) 1556 break; 1557 p += sizeof(ul); 1558 if (*p++ != ap->a_attrnamespace) 1559 continue; 1560 p++; /* pad2 */ 1561 ealen = *p; 1562 if (ap->a_size != NULL) { 1563 *ap->a_size += ealen + 1; 1564 } else if (ap->a_uio != NULL) { 1565 error = uiomove(p, ealen + 1, ap->a_uio); 1566 } 1567 } 1568 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1569 return(error); 1570 } 1571 1572 /* 1573 * Vnode operation to set a named attribute. 1574 */ 1575 static int 1576 ffs_setextattr(struct vop_setextattr_args *ap) 1577 /* 1578 vop_setextattr { 1579 IN struct vnode *a_vp; 1580 IN int a_attrnamespace; 1581 IN const char *a_name; 1582 INOUT struct uio *a_uio; 1583 IN struct ucred *a_cred; 1584 IN struct thread *a_td; 1585 }; 1586 */ 1587 { 1588 struct inode *ip; 1589 struct fs *fs; 1590 uint32_t ealength, ul; 1591 ssize_t ealen; 1592 int olen, eapad1, eapad2, error, i, easize; 1593 u_char *eae, *p; 1594 1595 ip = VTOI(ap->a_vp); 1596 fs = ITOFS(ip); 1597 1598 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1599 return (EOPNOTSUPP); 1600 1601 if (strlen(ap->a_name) == 0) 1602 return (EINVAL); 1603 1604 /* XXX Now unsupported API to delete EAs using NULL uio. */ 1605 if (ap->a_uio == NULL) 1606 return (EOPNOTSUPP); 1607 1608 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 1609 return (EROFS); 1610 1611 ealen = ap->a_uio->uio_resid; 1612 if (ealen < 0 || ealen > lblktosize(fs, NXADDR)) 1613 return (EINVAL); 1614 1615 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1616 ap->a_cred, ap->a_td, VWRITE); 1617 if (error) { 1618 1619 /* 1620 * ffs_lock_ea is not needed there, because the vnode 1621 * must be exclusively locked. 1622 */ 1623 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1624 ip->i_ea_error = error; 1625 return (error); 1626 } 1627 1628 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1629 if (error) 1630 return (error); 1631 1632 ealength = sizeof(uint32_t) + 3 + strlen(ap->a_name); 1633 eapad1 = 8 - (ealength % 8); 1634 if (eapad1 == 8) 1635 eapad1 = 0; 1636 eapad2 = 8 - (ealen % 8); 1637 if (eapad2 == 8) 1638 eapad2 = 0; 1639 ealength += eapad1 + ealen + eapad2; 1640 1641 eae = malloc(ip->i_ea_len + ealength, M_TEMP, M_WAITOK); 1642 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1643 easize = ip->i_ea_len; 1644 1645 olen = ffs_findextattr(eae, easize, 1646 ap->a_attrnamespace, ap->a_name, &p, NULL); 1647 if (olen == -1) { 1648 /* new, append at end */ 1649 p = eae + easize; 1650 easize += ealength; 1651 } else { 1652 bcopy(p, &ul, sizeof ul); 1653 i = p - eae + ul; 1654 if (ul != ealength) { 1655 bcopy(p + ul, p + ealength, easize - i); 1656 easize += (ealength - ul); 1657 } 1658 } 1659 if (easize > lblktosize(fs, NXADDR)) { 1660 free(eae, M_TEMP); 1661 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1662 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1663 ip->i_ea_error = ENOSPC; 1664 return(ENOSPC); 1665 } 1666 bcopy(&ealength, p, sizeof(ealength)); 1667 p += sizeof(ealength); 1668 *p++ = ap->a_attrnamespace; 1669 *p++ = eapad2; 1670 *p++ = strlen(ap->a_name); 1671 memcpy(p, ap->a_name, strlen(ap->a_name)); 1672 p += strlen(ap->a_name); 1673 bzero(p, eapad1); 1674 p += eapad1; 1675 error = uiomove(p, ealen, ap->a_uio); 1676 if (error) { 1677 free(eae, M_TEMP); 1678 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1679 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1680 ip->i_ea_error = error; 1681 return(error); 1682 } 1683 p += ealen; 1684 bzero(p, eapad2); 1685 1686 p = ip->i_ea_area; 1687 ip->i_ea_area = eae; 1688 ip->i_ea_len = easize; 1689 free(p, M_TEMP); 1690 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td); 1691 return(error); 1692 } 1693 1694 /* 1695 * Vnode pointer to File handle 1696 */ 1697 static int 1698 ffs_vptofh(struct vop_vptofh_args *ap) 1699 /* 1700 vop_vptofh { 1701 IN struct vnode *a_vp; 1702 IN struct fid *a_fhp; 1703 }; 1704 */ 1705 { 1706 struct inode *ip; 1707 struct ufid *ufhp; 1708 1709 ip = VTOI(ap->a_vp); 1710 ufhp = (struct ufid *)ap->a_fhp; 1711 ufhp->ufid_len = sizeof(struct ufid); 1712 ufhp->ufid_ino = ip->i_number; 1713 ufhp->ufid_gen = ip->i_gen; 1714 return (0); 1715 } 1716 1717 SYSCTL_DECL(_vfs_ffs); 1718 static int use_buf_pager = 0; 1719 SYSCTL_INT(_vfs_ffs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, &use_buf_pager, 0, 1720 "Always use buffer pager instead of bmap"); 1721 1722 static daddr_t 1723 ffs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1724 { 1725 1726 return (lblkno(VFSTOUFS(vp->v_mount)->um_fs, off)); 1727 } 1728 1729 static int 1730 ffs_gbp_getblksz(struct vnode *vp, daddr_t lbn) 1731 { 1732 1733 return (blksize(VFSTOUFS(vp->v_mount)->um_fs, VTOI(vp), lbn)); 1734 } 1735 1736 static int 1737 ffs_getpages(struct vop_getpages_args *ap) 1738 { 1739 struct vnode *vp; 1740 struct ufsmount *um; 1741 1742 vp = ap->a_vp; 1743 um = VFSTOUFS(vp->v_mount); 1744 1745 if (!use_buf_pager && um->um_devvp->v_bufobj.bo_bsize <= PAGE_SIZE) 1746 return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count, 1747 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1748 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind, 1749 ap->a_rahead, ffs_gbp_getblkno, ffs_gbp_getblksz)); 1750 }
Cache object: 33fb020a1a1e9c8d58f137eb20b3b711
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