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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: releng/8.3/sys/ufs/ffs/ffs_vnops.c 225320 2011-09-02 07:37:55Z mm $"); 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/stat.h> 79 #include <sys/vmmeter.h> 80 #include <sys/vnode.h> 81 82 #include <vm/vm.h> 83 #include <vm/vm_extern.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vm_pager.h> 87 #include <vm/vnode_pager.h> 88 89 #include <ufs/ufs/extattr.h> 90 #include <ufs/ufs/quota.h> 91 #include <ufs/ufs/inode.h> 92 #include <ufs/ufs/ufs_extern.h> 93 #include <ufs/ufs/ufsmount.h> 94 95 #include <ufs/ffs/fs.h> 96 #include <ufs/ffs/ffs_extern.h> 97 #include "opt_directio.h" 98 #include "opt_ffs.h" 99 100 #ifdef DIRECTIO 101 extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone); 102 #endif 103 static vop_fsync_t ffs_fsync; 104 static vop_lock1_t ffs_lock; 105 static vop_getpages_t ffs_getpages; 106 static vop_read_t ffs_read; 107 static vop_write_t ffs_write; 108 static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag); 109 static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, 110 struct ucred *cred); 111 static vop_strategy_t ffsext_strategy; 112 static vop_closeextattr_t ffs_closeextattr; 113 static vop_deleteextattr_t ffs_deleteextattr; 114 static vop_getextattr_t ffs_getextattr; 115 static vop_listextattr_t ffs_listextattr; 116 static vop_openextattr_t ffs_openextattr; 117 static vop_setextattr_t ffs_setextattr; 118 static vop_vptofh_t ffs_vptofh; 119 120 121 /* Global vfs data structures for ufs. */ 122 struct vop_vector ffs_vnodeops1 = { 123 .vop_default = &ufs_vnodeops, 124 .vop_fsync = ffs_fsync, 125 .vop_getpages = ffs_getpages, 126 .vop_lock1 = ffs_lock, 127 .vop_read = ffs_read, 128 .vop_reallocblks = ffs_reallocblks, 129 .vop_write = ffs_write, 130 .vop_vptofh = ffs_vptofh, 131 }; 132 133 struct vop_vector ffs_fifoops1 = { 134 .vop_default = &ufs_fifoops, 135 .vop_fsync = ffs_fsync, 136 .vop_reallocblks = ffs_reallocblks, /* XXX: really ??? */ 137 .vop_vptofh = ffs_vptofh, 138 }; 139 140 /* Global vfs data structures for ufs. */ 141 struct vop_vector ffs_vnodeops2 = { 142 .vop_default = &ufs_vnodeops, 143 .vop_fsync = ffs_fsync, 144 .vop_getpages = ffs_getpages, 145 .vop_lock1 = ffs_lock, 146 .vop_read = ffs_read, 147 .vop_reallocblks = ffs_reallocblks, 148 .vop_write = ffs_write, 149 .vop_closeextattr = ffs_closeextattr, 150 .vop_deleteextattr = ffs_deleteextattr, 151 .vop_getextattr = ffs_getextattr, 152 .vop_listextattr = ffs_listextattr, 153 .vop_openextattr = ffs_openextattr, 154 .vop_setextattr = ffs_setextattr, 155 .vop_vptofh = ffs_vptofh, 156 }; 157 158 struct vop_vector ffs_fifoops2 = { 159 .vop_default = &ufs_fifoops, 160 .vop_fsync = ffs_fsync, 161 .vop_lock1 = ffs_lock, 162 .vop_reallocblks = ffs_reallocblks, 163 .vop_strategy = ffsext_strategy, 164 .vop_closeextattr = ffs_closeextattr, 165 .vop_deleteextattr = ffs_deleteextattr, 166 .vop_getextattr = ffs_getextattr, 167 .vop_listextattr = ffs_listextattr, 168 .vop_openextattr = ffs_openextattr, 169 .vop_setextattr = ffs_setextattr, 170 .vop_vptofh = ffs_vptofh, 171 }; 172 173 /* 174 * Synch an open file. 175 */ 176 /* ARGSUSED */ 177 static int 178 ffs_fsync(struct vop_fsync_args *ap) 179 { 180 struct vnode *vp; 181 struct bufobj *bo; 182 int error; 183 184 vp = ap->a_vp; 185 bo = &vp->v_bufobj; 186 retry: 187 error = ffs_syncvnode(vp, ap->a_waitfor); 188 if (error) 189 return (error); 190 if (ap->a_waitfor == MNT_WAIT && 191 (vp->v_mount->mnt_flag & MNT_SOFTDEP)) { 192 error = softdep_fsync(vp); 193 if (error) 194 return (error); 195 196 /* 197 * The softdep_fsync() function may drop vp lock, 198 * allowing for dirty buffers to reappear on the 199 * bo_dirty list. Recheck and resync as needed. 200 */ 201 BO_LOCK(bo); 202 if (vp->v_type == VREG && (bo->bo_numoutput > 0 || 203 bo->bo_dirty.bv_cnt > 0)) { 204 BO_UNLOCK(bo); 205 goto retry; 206 } 207 BO_UNLOCK(bo); 208 } 209 return (0); 210 } 211 212 int 213 ffs_syncvnode(struct vnode *vp, int waitfor) 214 { 215 struct inode *ip = VTOI(vp); 216 struct bufobj *bo; 217 struct buf *bp; 218 struct buf *nbp; 219 int s, error, wait, passes, skipmeta; 220 ufs_lbn_t lbn; 221 222 wait = (waitfor == MNT_WAIT); 223 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 224 bo = &vp->v_bufobj; 225 226 /* 227 * Flush all dirty buffers associated with a vnode. 228 */ 229 passes = NIADDR + 1; 230 skipmeta = 0; 231 if (wait) 232 skipmeta = 1; 233 s = splbio(); 234 BO_LOCK(bo); 235 loop: 236 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 237 bp->b_vflags &= ~BV_SCANNED; 238 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 239 /* 240 * Reasons to skip this buffer: it has already been considered 241 * on this pass, this pass is the first time through on a 242 * synchronous flush request and the buffer being considered 243 * is metadata, the buffer has dependencies that will cause 244 * it to be redirtied and it has not already been deferred, 245 * or it is already being written. 246 */ 247 if ((bp->b_vflags & BV_SCANNED) != 0) 248 continue; 249 bp->b_vflags |= BV_SCANNED; 250 if ((skipmeta == 1 && bp->b_lblkno < 0)) 251 continue; 252 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 253 continue; 254 BO_UNLOCK(bo); 255 if (!wait && !LIST_EMPTY(&bp->b_dep) && 256 (bp->b_flags & B_DEFERRED) == 0 && 257 buf_countdeps(bp, 0)) { 258 bp->b_flags |= B_DEFERRED; 259 BUF_UNLOCK(bp); 260 BO_LOCK(bo); 261 continue; 262 } 263 if ((bp->b_flags & B_DELWRI) == 0) 264 panic("ffs_fsync: not dirty"); 265 /* 266 * If this is a synchronous flush request, or it is not a 267 * file or device, start the write on this buffer immediately. 268 */ 269 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) { 270 271 /* 272 * On our final pass through, do all I/O synchronously 273 * so that we can find out if our flush is failing 274 * because of write errors. 275 */ 276 if (passes > 0 || !wait) { 277 if ((bp->b_flags & B_CLUSTEROK) && !wait) { 278 (void) vfs_bio_awrite(bp); 279 } else { 280 bremfree(bp); 281 splx(s); 282 (void) bawrite(bp); 283 s = splbio(); 284 } 285 } else { 286 bremfree(bp); 287 splx(s); 288 if ((error = bwrite(bp)) != 0) 289 return (error); 290 s = splbio(); 291 } 292 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 293 /* 294 * If the buffer is for data that has been truncated 295 * off the file, then throw it away. 296 */ 297 bremfree(bp); 298 bp->b_flags |= B_INVAL | B_NOCACHE; 299 splx(s); 300 brelse(bp); 301 s = splbio(); 302 } else 303 vfs_bio_awrite(bp); 304 305 /* 306 * Since we may have slept during the I/O, we need 307 * to start from a known point. 308 */ 309 BO_LOCK(bo); 310 nbp = TAILQ_FIRST(&bo->bo_dirty.bv_hd); 311 } 312 /* 313 * If we were asked to do this synchronously, then go back for 314 * another pass, this time doing the metadata. 315 */ 316 if (skipmeta) { 317 skipmeta = 0; 318 goto loop; 319 } 320 321 if (wait) { 322 bufobj_wwait(bo, 0, 0); 323 BO_UNLOCK(bo); 324 325 /* 326 * Ensure that any filesystem metatdata associated 327 * with the vnode has been written. 328 */ 329 splx(s); 330 if ((error = softdep_sync_metadata(vp)) != 0) 331 return (error); 332 s = splbio(); 333 334 BO_LOCK(bo); 335 if (bo->bo_dirty.bv_cnt > 0) { 336 /* 337 * Block devices associated with filesystems may 338 * have new I/O requests posted for them even if 339 * the vnode is locked, so no amount of trying will 340 * get them clean. Thus we give block devices a 341 * good effort, then just give up. For all other file 342 * types, go around and try again until it is clean. 343 */ 344 if (passes > 0) { 345 passes -= 1; 346 goto loop; 347 } 348 #ifdef INVARIANTS 349 if (!vn_isdisk(vp, NULL)) 350 vprint("ffs_fsync: dirty", vp); 351 #endif 352 } 353 } 354 BO_UNLOCK(bo); 355 splx(s); 356 return (ffs_update(vp, wait)); 357 } 358 359 static int 360 ffs_lock(ap) 361 struct vop_lock1_args /* { 362 struct vnode *a_vp; 363 int a_flags; 364 struct thread *a_td; 365 char *file; 366 int line; 367 } */ *ap; 368 { 369 #ifndef NO_FFS_SNAPSHOT 370 struct vnode *vp; 371 int flags; 372 struct lock *lkp; 373 int result; 374 375 switch (ap->a_flags & LK_TYPE_MASK) { 376 case LK_SHARED: 377 case LK_UPGRADE: 378 case LK_EXCLUSIVE: 379 vp = ap->a_vp; 380 flags = ap->a_flags; 381 for (;;) { 382 #ifdef DEBUG_VFS_LOCKS 383 KASSERT(vp->v_holdcnt != 0, 384 ("ffs_lock %p: zero hold count", vp)); 385 #endif 386 lkp = vp->v_vnlock; 387 result = _lockmgr_args(lkp, flags, VI_MTX(vp), 388 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, 389 ap->a_file, ap->a_line); 390 if (lkp == vp->v_vnlock || result != 0) 391 break; 392 /* 393 * Apparent success, except that the vnode 394 * mutated between snapshot file vnode and 395 * regular file vnode while this process 396 * slept. The lock currently held is not the 397 * right lock. Release it, and try to get the 398 * new lock. 399 */ 400 (void) _lockmgr_args(lkp, LK_RELEASE, NULL, 401 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, 402 ap->a_file, ap->a_line); 403 if ((flags & (LK_INTERLOCK | LK_NOWAIT)) == 404 (LK_INTERLOCK | LK_NOWAIT)) 405 return (EBUSY); 406 if ((flags & LK_TYPE_MASK) == LK_UPGRADE) 407 flags = (flags & ~LK_TYPE_MASK) | LK_EXCLUSIVE; 408 flags &= ~LK_INTERLOCK; 409 } 410 break; 411 default: 412 result = VOP_LOCK1_APV(&ufs_vnodeops, ap); 413 } 414 return (result); 415 #else 416 return (VOP_LOCK1_APV(&ufs_vnodeops, ap)); 417 #endif 418 } 419 420 /* 421 * Vnode op for reading. 422 */ 423 /* ARGSUSED */ 424 static int 425 ffs_read(ap) 426 struct vop_read_args /* { 427 struct vnode *a_vp; 428 struct uio *a_uio; 429 int a_ioflag; 430 struct ucred *a_cred; 431 } */ *ap; 432 { 433 struct vnode *vp; 434 struct inode *ip; 435 struct uio *uio; 436 struct fs *fs; 437 struct buf *bp; 438 ufs_lbn_t lbn, nextlbn; 439 off_t bytesinfile; 440 long size, xfersize, blkoffset; 441 int error, orig_resid; 442 int seqcount; 443 int ioflag; 444 445 vp = ap->a_vp; 446 uio = ap->a_uio; 447 ioflag = ap->a_ioflag; 448 if (ap->a_ioflag & IO_EXT) 449 #ifdef notyet 450 return (ffs_extread(vp, uio, ioflag)); 451 #else 452 panic("ffs_read+IO_EXT"); 453 #endif 454 #ifdef DIRECTIO 455 if ((ioflag & IO_DIRECT) != 0) { 456 int workdone; 457 458 error = ffs_rawread(vp, uio, &workdone); 459 if (error != 0 || workdone != 0) 460 return error; 461 } 462 #endif 463 464 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 465 ip = VTOI(vp); 466 467 #ifdef INVARIANTS 468 if (uio->uio_rw != UIO_READ) 469 panic("ffs_read: mode"); 470 471 if (vp->v_type == VLNK) { 472 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 473 panic("ffs_read: short symlink"); 474 } else if (vp->v_type != VREG && vp->v_type != VDIR) 475 panic("ffs_read: type %d", vp->v_type); 476 #endif 477 orig_resid = uio->uio_resid; 478 KASSERT(orig_resid >= 0, ("ffs_read: uio->uio_resid < 0")); 479 if (orig_resid == 0) 480 return (0); 481 KASSERT(uio->uio_offset >= 0, ("ffs_read: uio->uio_offset < 0")); 482 fs = ip->i_fs; 483 if (uio->uio_offset < ip->i_size && 484 uio->uio_offset >= fs->fs_maxfilesize) 485 return (EOVERFLOW); 486 487 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 488 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 489 break; 490 lbn = lblkno(fs, uio->uio_offset); 491 nextlbn = lbn + 1; 492 493 /* 494 * size of buffer. The buffer representing the 495 * end of the file is rounded up to the size of 496 * the block type ( fragment or full block, 497 * depending ). 498 */ 499 size = blksize(fs, ip, lbn); 500 blkoffset = blkoff(fs, uio->uio_offset); 501 502 /* 503 * The amount we want to transfer in this iteration is 504 * one FS block less the amount of the data before 505 * our startpoint (duh!) 506 */ 507 xfersize = fs->fs_bsize - blkoffset; 508 509 /* 510 * But if we actually want less than the block, 511 * or the file doesn't have a whole block more of data, 512 * then use the lesser number. 513 */ 514 if (uio->uio_resid < xfersize) 515 xfersize = uio->uio_resid; 516 if (bytesinfile < xfersize) 517 xfersize = bytesinfile; 518 519 if (lblktosize(fs, nextlbn) >= ip->i_size) { 520 /* 521 * Don't do readahead if this is the end of the file. 522 */ 523 error = bread(vp, lbn, size, NOCRED, &bp); 524 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 525 /* 526 * Otherwise if we are allowed to cluster, 527 * grab as much as we can. 528 * 529 * XXX This may not be a win if we are not 530 * doing sequential access. 531 */ 532 error = cluster_read(vp, ip->i_size, lbn, 533 size, NOCRED, blkoffset + uio->uio_resid, seqcount, &bp); 534 } else if (seqcount > 1) { 535 /* 536 * If we are NOT allowed to cluster, then 537 * if we appear to be acting sequentially, 538 * fire off a request for a readahead 539 * as well as a read. Note that the 4th and 5th 540 * arguments point to arrays of the size specified in 541 * the 6th argument. 542 */ 543 int nextsize = blksize(fs, ip, nextlbn); 544 error = breadn(vp, lbn, 545 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 546 } else { 547 /* 548 * Failing all of the above, just read what the 549 * user asked for. Interestingly, the same as 550 * the first option above. 551 */ 552 error = bread(vp, lbn, size, NOCRED, &bp); 553 } 554 if (error) { 555 brelse(bp); 556 bp = NULL; 557 break; 558 } 559 560 /* 561 * If IO_DIRECT then set B_DIRECT for the buffer. This 562 * will cause us to attempt to release the buffer later on 563 * and will cause the buffer cache to attempt to free the 564 * underlying pages. 565 */ 566 if (ioflag & IO_DIRECT) 567 bp->b_flags |= B_DIRECT; 568 569 /* 570 * We should only get non-zero b_resid when an I/O error 571 * has occurred, which should cause us to break above. 572 * However, if the short read did not cause an error, 573 * then we want to ensure that we do not uiomove bad 574 * or uninitialized data. 575 */ 576 size -= bp->b_resid; 577 if (size < xfersize) { 578 if (size == 0) 579 break; 580 xfersize = size; 581 } 582 583 error = uiomove((char *)bp->b_data + blkoffset, 584 (int)xfersize, uio); 585 if (error) 586 break; 587 588 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 589 (LIST_EMPTY(&bp->b_dep))) { 590 /* 591 * If there are no dependencies, and it's VMIO, 592 * then we don't need the buf, mark it available 593 * for freeing. The VM has the data. 594 */ 595 bp->b_flags |= B_RELBUF; 596 brelse(bp); 597 } else { 598 /* 599 * Otherwise let whoever 600 * made the request take care of 601 * freeing it. We just queue 602 * it onto another list. 603 */ 604 bqrelse(bp); 605 } 606 } 607 608 /* 609 * This can only happen in the case of an error 610 * because the loop above resets bp to NULL on each iteration 611 * and on normal completion has not set a new value into it. 612 * so it must have come from a 'break' statement 613 */ 614 if (bp != NULL) { 615 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 616 (LIST_EMPTY(&bp->b_dep))) { 617 bp->b_flags |= B_RELBUF; 618 brelse(bp); 619 } else { 620 bqrelse(bp); 621 } 622 } 623 624 if ((error == 0 || uio->uio_resid != orig_resid) && 625 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0 && 626 (ip->i_flag & IN_ACCESS) == 0) { 627 VI_LOCK(vp); 628 ip->i_flag |= IN_ACCESS; 629 VI_UNLOCK(vp); 630 } 631 return (error); 632 } 633 634 /* 635 * Vnode op for writing. 636 */ 637 static int 638 ffs_write(ap) 639 struct vop_write_args /* { 640 struct vnode *a_vp; 641 struct uio *a_uio; 642 int a_ioflag; 643 struct ucred *a_cred; 644 } */ *ap; 645 { 646 struct vnode *vp; 647 struct uio *uio; 648 struct inode *ip; 649 struct fs *fs; 650 struct buf *bp; 651 ufs_lbn_t lbn; 652 off_t osize; 653 int seqcount; 654 int blkoffset, error, flags, ioflag, resid, size, xfersize; 655 656 vp = ap->a_vp; 657 uio = ap->a_uio; 658 ioflag = ap->a_ioflag; 659 if (ap->a_ioflag & IO_EXT) 660 #ifdef notyet 661 return (ffs_extwrite(vp, uio, ioflag, ap->a_cred)); 662 #else 663 panic("ffs_write+IO_EXT"); 664 #endif 665 666 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 667 ip = VTOI(vp); 668 669 #ifdef INVARIANTS 670 if (uio->uio_rw != UIO_WRITE) 671 panic("ffs_write: mode"); 672 #endif 673 674 switch (vp->v_type) { 675 case VREG: 676 if (ioflag & IO_APPEND) 677 uio->uio_offset = ip->i_size; 678 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 679 return (EPERM); 680 /* FALLTHROUGH */ 681 case VLNK: 682 break; 683 case VDIR: 684 panic("ffs_write: dir write"); 685 break; 686 default: 687 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type, 688 (int)uio->uio_offset, 689 (int)uio->uio_resid 690 ); 691 } 692 693 KASSERT(uio->uio_resid >= 0, ("ffs_write: uio->uio_resid < 0")); 694 KASSERT(uio->uio_offset >= 0, ("ffs_write: uio->uio_offset < 0")); 695 fs = ip->i_fs; 696 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) 697 return (EFBIG); 698 /* 699 * Maybe this should be above the vnode op call, but so long as 700 * file servers have no limits, I don't think it matters. 701 */ 702 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 703 return (EFBIG); 704 705 resid = uio->uio_resid; 706 osize = ip->i_size; 707 if (seqcount > BA_SEQMAX) 708 flags = BA_SEQMAX << BA_SEQSHIFT; 709 else 710 flags = seqcount << BA_SEQSHIFT; 711 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 712 flags |= IO_SYNC; 713 714 for (error = 0; uio->uio_resid > 0;) { 715 lbn = lblkno(fs, uio->uio_offset); 716 blkoffset = blkoff(fs, uio->uio_offset); 717 xfersize = fs->fs_bsize - blkoffset; 718 if (uio->uio_resid < xfersize) 719 xfersize = uio->uio_resid; 720 if (uio->uio_offset + xfersize > ip->i_size) 721 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 722 723 /* 724 * We must perform a read-before-write if the transfer size 725 * does not cover the entire buffer. 726 */ 727 if (fs->fs_bsize > xfersize) 728 flags |= BA_CLRBUF; 729 else 730 flags &= ~BA_CLRBUF; 731 /* XXX is uio->uio_offset the right thing here? */ 732 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 733 ap->a_cred, flags, &bp); 734 if (error != 0) { 735 vnode_pager_setsize(vp, ip->i_size); 736 break; 737 } 738 /* 739 * If the buffer is not valid we have to clear out any 740 * garbage data from the pages instantiated for the buffer. 741 * If we do not, a failed uiomove() during a write can leave 742 * the prior contents of the pages exposed to a userland 743 * mmap(). XXX deal with uiomove() errors a better way. 744 */ 745 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 746 vfs_bio_clrbuf(bp); 747 if (ioflag & IO_DIRECT) 748 bp->b_flags |= B_DIRECT; 749 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 750 bp->b_flags |= B_NOCACHE; 751 752 if (uio->uio_offset + xfersize > ip->i_size) { 753 ip->i_size = uio->uio_offset + xfersize; 754 DIP_SET(ip, i_size, ip->i_size); 755 } 756 757 size = blksize(fs, ip, lbn) - bp->b_resid; 758 if (size < xfersize) 759 xfersize = size; 760 761 error = 762 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 763 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 764 (LIST_EMPTY(&bp->b_dep))) { 765 bp->b_flags |= B_RELBUF; 766 } 767 768 /* 769 * If IO_SYNC each buffer is written synchronously. Otherwise 770 * if we have a severe page deficiency write the buffer 771 * asynchronously. Otherwise try to cluster, and if that 772 * doesn't do it then either do an async write (if O_DIRECT), 773 * or a delayed write (if not). 774 */ 775 if (ioflag & IO_SYNC) { 776 (void)bwrite(bp); 777 } else if (vm_page_count_severe() || 778 buf_dirty_count_severe() || 779 (ioflag & IO_ASYNC)) { 780 bp->b_flags |= B_CLUSTEROK; 781 bawrite(bp); 782 } else if (xfersize + blkoffset == fs->fs_bsize) { 783 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 784 bp->b_flags |= B_CLUSTEROK; 785 cluster_write(vp, bp, ip->i_size, seqcount); 786 } else { 787 bawrite(bp); 788 } 789 } else if (ioflag & IO_DIRECT) { 790 bp->b_flags |= B_CLUSTEROK; 791 bawrite(bp); 792 } else { 793 bp->b_flags |= B_CLUSTEROK; 794 bdwrite(bp); 795 } 796 if (error || xfersize == 0) 797 break; 798 ip->i_flag |= IN_CHANGE | IN_UPDATE; 799 } 800 /* 801 * If we successfully wrote any data, and we are not the superuser 802 * we clear the setuid and setgid bits as a precaution against 803 * tampering. 804 */ 805 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 806 ap->a_cred) { 807 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0)) { 808 ip->i_mode &= ~(ISUID | ISGID); 809 DIP_SET(ip, i_mode, ip->i_mode); 810 } 811 } 812 if (error) { 813 if (ioflag & IO_UNIT) { 814 (void)ffs_truncate(vp, osize, 815 IO_NORMAL | (ioflag & IO_SYNC), 816 ap->a_cred, uio->uio_td); 817 uio->uio_offset -= resid - uio->uio_resid; 818 uio->uio_resid = resid; 819 } 820 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 821 error = ffs_update(vp, 1); 822 return (error); 823 } 824 825 /* 826 * get page routine 827 */ 828 static int 829 ffs_getpages(ap) 830 struct vop_getpages_args *ap; 831 { 832 int i; 833 vm_page_t mreq; 834 int pcount; 835 836 pcount = round_page(ap->a_count) / PAGE_SIZE; 837 mreq = ap->a_m[ap->a_reqpage]; 838 839 /* 840 * if ANY DEV_BSIZE blocks are valid on a large filesystem block, 841 * then the entire page is valid. Since the page may be mapped, 842 * user programs might reference data beyond the actual end of file 843 * occuring within the page. We have to zero that data. 844 */ 845 VM_OBJECT_LOCK(mreq->object); 846 if (mreq->valid) { 847 if (mreq->valid != VM_PAGE_BITS_ALL) 848 vm_page_zero_invalid(mreq, TRUE); 849 vm_page_lock_queues(); 850 for (i = 0; i < pcount; i++) { 851 if (i != ap->a_reqpage) { 852 vm_page_free(ap->a_m[i]); 853 } 854 } 855 vm_page_unlock_queues(); 856 VM_OBJECT_UNLOCK(mreq->object); 857 return VM_PAGER_OK; 858 } 859 VM_OBJECT_UNLOCK(mreq->object); 860 861 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 862 ap->a_count, 863 ap->a_reqpage); 864 } 865 866 867 /* 868 * Extended attribute area reading. 869 */ 870 static int 871 ffs_extread(struct vnode *vp, struct uio *uio, int ioflag) 872 { 873 struct inode *ip; 874 struct ufs2_dinode *dp; 875 struct fs *fs; 876 struct buf *bp; 877 ufs_lbn_t lbn, nextlbn; 878 off_t bytesinfile; 879 long size, xfersize, blkoffset; 880 int error, orig_resid; 881 882 ip = VTOI(vp); 883 fs = ip->i_fs; 884 dp = ip->i_din2; 885 886 #ifdef INVARIANTS 887 if (uio->uio_rw != UIO_READ || fs->fs_magic != FS_UFS2_MAGIC) 888 panic("ffs_extread: mode"); 889 890 #endif 891 orig_resid = uio->uio_resid; 892 KASSERT(orig_resid >= 0, ("ffs_extread: uio->uio_resid < 0")); 893 if (orig_resid == 0) 894 return (0); 895 KASSERT(uio->uio_offset >= 0, ("ffs_extread: uio->uio_offset < 0")); 896 897 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 898 if ((bytesinfile = dp->di_extsize - uio->uio_offset) <= 0) 899 break; 900 lbn = lblkno(fs, uio->uio_offset); 901 nextlbn = lbn + 1; 902 903 /* 904 * size of buffer. The buffer representing the 905 * end of the file is rounded up to the size of 906 * the block type ( fragment or full block, 907 * depending ). 908 */ 909 size = sblksize(fs, dp->di_extsize, lbn); 910 blkoffset = blkoff(fs, uio->uio_offset); 911 912 /* 913 * The amount we want to transfer in this iteration is 914 * one FS block less the amount of the data before 915 * our startpoint (duh!) 916 */ 917 xfersize = fs->fs_bsize - blkoffset; 918 919 /* 920 * But if we actually want less than the block, 921 * or the file doesn't have a whole block more of data, 922 * then use the lesser number. 923 */ 924 if (uio->uio_resid < xfersize) 925 xfersize = uio->uio_resid; 926 if (bytesinfile < xfersize) 927 xfersize = bytesinfile; 928 929 if (lblktosize(fs, nextlbn) >= dp->di_extsize) { 930 /* 931 * Don't do readahead if this is the end of the info. 932 */ 933 error = bread(vp, -1 - lbn, size, NOCRED, &bp); 934 } else { 935 /* 936 * If we have a second block, then 937 * fire off a request for a readahead 938 * as well as a read. Note that the 4th and 5th 939 * arguments point to arrays of the size specified in 940 * the 6th argument. 941 */ 942 int nextsize = sblksize(fs, dp->di_extsize, nextlbn); 943 944 nextlbn = -1 - nextlbn; 945 error = breadn(vp, -1 - lbn, 946 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 947 } 948 if (error) { 949 brelse(bp); 950 bp = NULL; 951 break; 952 } 953 954 /* 955 * If IO_DIRECT then set B_DIRECT for the buffer. This 956 * will cause us to attempt to release the buffer later on 957 * and will cause the buffer cache to attempt to free the 958 * underlying pages. 959 */ 960 if (ioflag & IO_DIRECT) 961 bp->b_flags |= B_DIRECT; 962 963 /* 964 * We should only get non-zero b_resid when an I/O error 965 * has occurred, which should cause us to break above. 966 * However, if the short read did not cause an error, 967 * then we want to ensure that we do not uiomove bad 968 * or uninitialized data. 969 */ 970 size -= bp->b_resid; 971 if (size < xfersize) { 972 if (size == 0) 973 break; 974 xfersize = size; 975 } 976 977 error = uiomove((char *)bp->b_data + blkoffset, 978 (int)xfersize, uio); 979 if (error) 980 break; 981 982 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 983 (LIST_EMPTY(&bp->b_dep))) { 984 /* 985 * If there are no dependencies, and it's VMIO, 986 * then we don't need the buf, mark it available 987 * for freeing. The VM has the data. 988 */ 989 bp->b_flags |= B_RELBUF; 990 brelse(bp); 991 } else { 992 /* 993 * Otherwise let whoever 994 * made the request take care of 995 * freeing it. We just queue 996 * it onto another list. 997 */ 998 bqrelse(bp); 999 } 1000 } 1001 1002 /* 1003 * This can only happen in the case of an error 1004 * because the loop above resets bp to NULL on each iteration 1005 * and on normal completion has not set a new value into it. 1006 * so it must have come from a 'break' statement 1007 */ 1008 if (bp != NULL) { 1009 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 1010 (LIST_EMPTY(&bp->b_dep))) { 1011 bp->b_flags |= B_RELBUF; 1012 brelse(bp); 1013 } else { 1014 bqrelse(bp); 1015 } 1016 } 1017 return (error); 1018 } 1019 1020 /* 1021 * Extended attribute area writing. 1022 */ 1023 static int 1024 ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred) 1025 { 1026 struct inode *ip; 1027 struct ufs2_dinode *dp; 1028 struct fs *fs; 1029 struct buf *bp; 1030 ufs_lbn_t lbn; 1031 off_t osize; 1032 int blkoffset, error, flags, resid, size, xfersize; 1033 1034 ip = VTOI(vp); 1035 fs = ip->i_fs; 1036 dp = ip->i_din2; 1037 1038 KASSERT(!(ip->i_flag & IN_SPACECOUNTED), ("inode %u: inode is dead", 1039 ip->i_number)); 1040 1041 #ifdef INVARIANTS 1042 if (uio->uio_rw != UIO_WRITE || fs->fs_magic != FS_UFS2_MAGIC) 1043 panic("ffs_extwrite: mode"); 1044 #endif 1045 1046 if (ioflag & IO_APPEND) 1047 uio->uio_offset = dp->di_extsize; 1048 KASSERT(uio->uio_offset >= 0, ("ffs_extwrite: uio->uio_offset < 0")); 1049 KASSERT(uio->uio_resid >= 0, ("ffs_extwrite: uio->uio_resid < 0")); 1050 if ((uoff_t)uio->uio_offset + uio->uio_resid > NXADDR * fs->fs_bsize) 1051 return (EFBIG); 1052 1053 resid = uio->uio_resid; 1054 osize = dp->di_extsize; 1055 flags = IO_EXT; 1056 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1057 flags |= IO_SYNC; 1058 1059 for (error = 0; uio->uio_resid > 0;) { 1060 lbn = lblkno(fs, uio->uio_offset); 1061 blkoffset = blkoff(fs, uio->uio_offset); 1062 xfersize = fs->fs_bsize - blkoffset; 1063 if (uio->uio_resid < xfersize) 1064 xfersize = uio->uio_resid; 1065 1066 /* 1067 * We must perform a read-before-write if the transfer size 1068 * does not cover the entire buffer. 1069 */ 1070 if (fs->fs_bsize > xfersize) 1071 flags |= BA_CLRBUF; 1072 else 1073 flags &= ~BA_CLRBUF; 1074 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 1075 ucred, flags, &bp); 1076 if (error != 0) 1077 break; 1078 /* 1079 * If the buffer is not valid we have to clear out any 1080 * garbage data from the pages instantiated for the buffer. 1081 * If we do not, a failed uiomove() during a write can leave 1082 * the prior contents of the pages exposed to a userland 1083 * mmap(). XXX deal with uiomove() errors a better way. 1084 */ 1085 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 1086 vfs_bio_clrbuf(bp); 1087 if (ioflag & IO_DIRECT) 1088 bp->b_flags |= B_DIRECT; 1089 1090 if (uio->uio_offset + xfersize > dp->di_extsize) 1091 dp->di_extsize = uio->uio_offset + xfersize; 1092 1093 size = sblksize(fs, dp->di_extsize, lbn) - bp->b_resid; 1094 if (size < xfersize) 1095 xfersize = size; 1096 1097 error = 1098 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1099 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 1100 (LIST_EMPTY(&bp->b_dep))) { 1101 bp->b_flags |= B_RELBUF; 1102 } 1103 1104 /* 1105 * If IO_SYNC each buffer is written synchronously. Otherwise 1106 * if we have a severe page deficiency write the buffer 1107 * asynchronously. Otherwise try to cluster, and if that 1108 * doesn't do it then either do an async write (if O_DIRECT), 1109 * or a delayed write (if not). 1110 */ 1111 if (ioflag & IO_SYNC) { 1112 (void)bwrite(bp); 1113 } else if (vm_page_count_severe() || 1114 buf_dirty_count_severe() || 1115 xfersize + blkoffset == fs->fs_bsize || 1116 (ioflag & (IO_ASYNC | IO_DIRECT))) 1117 bawrite(bp); 1118 else 1119 bdwrite(bp); 1120 if (error || xfersize == 0) 1121 break; 1122 ip->i_flag |= IN_CHANGE; 1123 } 1124 /* 1125 * If we successfully wrote any data, and we are not the superuser 1126 * we clear the setuid and setgid bits as a precaution against 1127 * tampering. 1128 */ 1129 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && ucred) { 1130 if (priv_check_cred(ucred, PRIV_VFS_RETAINSUGID, 0)) { 1131 ip->i_mode &= ~(ISUID | ISGID); 1132 dp->di_mode = ip->i_mode; 1133 } 1134 } 1135 if (error) { 1136 if (ioflag & IO_UNIT) { 1137 (void)ffs_truncate(vp, osize, 1138 IO_EXT | (ioflag&IO_SYNC), ucred, uio->uio_td); 1139 uio->uio_offset -= resid - uio->uio_resid; 1140 uio->uio_resid = resid; 1141 } 1142 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 1143 error = ffs_update(vp, 1); 1144 return (error); 1145 } 1146 1147 1148 /* 1149 * Vnode operating to retrieve a named extended attribute. 1150 * 1151 * Locate a particular EA (nspace:name) in the area (ptr:length), and return 1152 * the length of the EA, and possibly the pointer to the entry and to the data. 1153 */ 1154 static int 1155 ffs_findextattr(u_char *ptr, u_int length, int nspace, const char *name, u_char **eap, u_char **eac) 1156 { 1157 u_char *p, *pe, *pn, *p0; 1158 int eapad1, eapad2, ealength, ealen, nlen; 1159 uint32_t ul; 1160 1161 pe = ptr + length; 1162 nlen = strlen(name); 1163 1164 for (p = ptr; p < pe; p = pn) { 1165 p0 = p; 1166 bcopy(p, &ul, sizeof(ul)); 1167 pn = p + ul; 1168 /* make sure this entry is complete */ 1169 if (pn > pe) 1170 break; 1171 p += sizeof(uint32_t); 1172 if (*p != nspace) 1173 continue; 1174 p++; 1175 eapad2 = *p++; 1176 if (*p != nlen) 1177 continue; 1178 p++; 1179 if (bcmp(p, name, nlen)) 1180 continue; 1181 ealength = sizeof(uint32_t) + 3 + nlen; 1182 eapad1 = 8 - (ealength % 8); 1183 if (eapad1 == 8) 1184 eapad1 = 0; 1185 ealength += eapad1; 1186 ealen = ul - ealength - eapad2; 1187 p += nlen + eapad1; 1188 if (eap != NULL) 1189 *eap = p0; 1190 if (eac != NULL) 1191 *eac = p; 1192 return (ealen); 1193 } 1194 return(-1); 1195 } 1196 1197 static int 1198 ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td, int extra) 1199 { 1200 struct inode *ip; 1201 struct ufs2_dinode *dp; 1202 struct fs *fs; 1203 struct uio luio; 1204 struct iovec liovec; 1205 int easize, error; 1206 u_char *eae; 1207 1208 ip = VTOI(vp); 1209 fs = ip->i_fs; 1210 dp = ip->i_din2; 1211 easize = dp->di_extsize; 1212 if ((uoff_t)easize + extra > NXADDR * fs->fs_bsize) 1213 return (EFBIG); 1214 1215 eae = malloc(easize + extra, M_TEMP, M_WAITOK); 1216 1217 liovec.iov_base = eae; 1218 liovec.iov_len = easize; 1219 luio.uio_iov = &liovec; 1220 luio.uio_iovcnt = 1; 1221 luio.uio_offset = 0; 1222 luio.uio_resid = easize; 1223 luio.uio_segflg = UIO_SYSSPACE; 1224 luio.uio_rw = UIO_READ; 1225 luio.uio_td = td; 1226 1227 error = ffs_extread(vp, &luio, IO_EXT | IO_SYNC); 1228 if (error) { 1229 free(eae, M_TEMP); 1230 return(error); 1231 } 1232 *p = eae; 1233 return (0); 1234 } 1235 1236 static void 1237 ffs_lock_ea(struct vnode *vp) 1238 { 1239 struct inode *ip; 1240 1241 ip = VTOI(vp); 1242 VI_LOCK(vp); 1243 while (ip->i_flag & IN_EA_LOCKED) { 1244 ip->i_flag |= IN_EA_LOCKWAIT; 1245 msleep(&ip->i_ea_refs, &vp->v_interlock, PINOD + 2, "ufs_ea", 1246 0); 1247 } 1248 ip->i_flag |= IN_EA_LOCKED; 1249 VI_UNLOCK(vp); 1250 } 1251 1252 static void 1253 ffs_unlock_ea(struct vnode *vp) 1254 { 1255 struct inode *ip; 1256 1257 ip = VTOI(vp); 1258 VI_LOCK(vp); 1259 if (ip->i_flag & IN_EA_LOCKWAIT) 1260 wakeup(&ip->i_ea_refs); 1261 ip->i_flag &= ~(IN_EA_LOCKED | IN_EA_LOCKWAIT); 1262 VI_UNLOCK(vp); 1263 } 1264 1265 static int 1266 ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td) 1267 { 1268 struct inode *ip; 1269 struct ufs2_dinode *dp; 1270 int error; 1271 1272 ip = VTOI(vp); 1273 1274 ffs_lock_ea(vp); 1275 if (ip->i_ea_area != NULL) { 1276 ip->i_ea_refs++; 1277 ffs_unlock_ea(vp); 1278 return (0); 1279 } 1280 dp = ip->i_din2; 1281 error = ffs_rdextattr(&ip->i_ea_area, vp, td, 0); 1282 if (error) { 1283 ffs_unlock_ea(vp); 1284 return (error); 1285 } 1286 ip->i_ea_len = dp->di_extsize; 1287 ip->i_ea_error = 0; 1288 ip->i_ea_refs++; 1289 ffs_unlock_ea(vp); 1290 return (0); 1291 } 1292 1293 /* 1294 * Vnode extattr transaction commit/abort 1295 */ 1296 static int 1297 ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td) 1298 { 1299 struct inode *ip; 1300 struct uio luio; 1301 struct iovec liovec; 1302 int error; 1303 struct ufs2_dinode *dp; 1304 1305 ip = VTOI(vp); 1306 1307 ffs_lock_ea(vp); 1308 if (ip->i_ea_area == NULL) { 1309 ffs_unlock_ea(vp); 1310 return (EINVAL); 1311 } 1312 dp = ip->i_din2; 1313 error = ip->i_ea_error; 1314 if (commit && error == 0) { 1315 ASSERT_VOP_ELOCKED(vp, "ffs_close_ea commit"); 1316 if (cred == NOCRED) 1317 cred = vp->v_mount->mnt_cred; 1318 liovec.iov_base = ip->i_ea_area; 1319 liovec.iov_len = ip->i_ea_len; 1320 luio.uio_iov = &liovec; 1321 luio.uio_iovcnt = 1; 1322 luio.uio_offset = 0; 1323 luio.uio_resid = ip->i_ea_len; 1324 luio.uio_segflg = UIO_SYSSPACE; 1325 luio.uio_rw = UIO_WRITE; 1326 luio.uio_td = td; 1327 /* XXX: I'm not happy about truncating to zero size */ 1328 if (ip->i_ea_len < dp->di_extsize) 1329 error = ffs_truncate(vp, 0, IO_EXT, cred, td); 1330 error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred); 1331 } 1332 if (--ip->i_ea_refs == 0) { 1333 free(ip->i_ea_area, M_TEMP); 1334 ip->i_ea_area = NULL; 1335 ip->i_ea_len = 0; 1336 ip->i_ea_error = 0; 1337 } 1338 ffs_unlock_ea(vp); 1339 return (error); 1340 } 1341 1342 /* 1343 * Vnode extattr strategy routine for fifos. 1344 * 1345 * We need to check for a read or write of the external attributes. 1346 * Otherwise we just fall through and do the usual thing. 1347 */ 1348 static int 1349 ffsext_strategy(struct vop_strategy_args *ap) 1350 /* 1351 struct vop_strategy_args { 1352 struct vnodeop_desc *a_desc; 1353 struct vnode *a_vp; 1354 struct buf *a_bp; 1355 }; 1356 */ 1357 { 1358 struct vnode *vp; 1359 daddr_t lbn; 1360 1361 vp = ap->a_vp; 1362 lbn = ap->a_bp->b_lblkno; 1363 if (VTOI(vp)->i_fs->fs_magic == FS_UFS2_MAGIC && 1364 lbn < 0 && lbn >= -NXADDR) 1365 return (VOP_STRATEGY_APV(&ufs_vnodeops, ap)); 1366 if (vp->v_type == VFIFO) 1367 return (VOP_STRATEGY_APV(&ufs_fifoops, ap)); 1368 panic("spec nodes went here"); 1369 } 1370 1371 /* 1372 * Vnode extattr transaction commit/abort 1373 */ 1374 static int 1375 ffs_openextattr(struct vop_openextattr_args *ap) 1376 /* 1377 struct vop_openextattr_args { 1378 struct vnodeop_desc *a_desc; 1379 struct vnode *a_vp; 1380 IN struct ucred *a_cred; 1381 IN struct thread *a_td; 1382 }; 1383 */ 1384 { 1385 struct inode *ip; 1386 struct fs *fs; 1387 1388 ip = VTOI(ap->a_vp); 1389 fs = ip->i_fs; 1390 1391 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1392 return (EOPNOTSUPP); 1393 1394 return (ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td)); 1395 } 1396 1397 1398 /* 1399 * Vnode extattr transaction commit/abort 1400 */ 1401 static int 1402 ffs_closeextattr(struct vop_closeextattr_args *ap) 1403 /* 1404 struct vop_closeextattr_args { 1405 struct vnodeop_desc *a_desc; 1406 struct vnode *a_vp; 1407 int a_commit; 1408 IN struct ucred *a_cred; 1409 IN struct thread *a_td; 1410 }; 1411 */ 1412 { 1413 struct inode *ip; 1414 struct fs *fs; 1415 1416 ip = VTOI(ap->a_vp); 1417 fs = ip->i_fs; 1418 1419 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1420 return (EOPNOTSUPP); 1421 1422 if (ap->a_commit && (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)) 1423 return (EROFS); 1424 1425 return (ffs_close_ea(ap->a_vp, ap->a_commit, ap->a_cred, ap->a_td)); 1426 } 1427 1428 /* 1429 * Vnode operation to remove a named attribute. 1430 */ 1431 static int 1432 ffs_deleteextattr(struct vop_deleteextattr_args *ap) 1433 /* 1434 vop_deleteextattr { 1435 IN struct vnode *a_vp; 1436 IN int a_attrnamespace; 1437 IN const char *a_name; 1438 IN struct ucred *a_cred; 1439 IN struct thread *a_td; 1440 }; 1441 */ 1442 { 1443 struct inode *ip; 1444 struct fs *fs; 1445 uint32_t ealength, ul; 1446 int ealen, olen, eapad1, eapad2, error, i, easize; 1447 u_char *eae, *p; 1448 1449 ip = VTOI(ap->a_vp); 1450 fs = ip->i_fs; 1451 1452 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1453 return (EOPNOTSUPP); 1454 1455 if (strlen(ap->a_name) == 0) 1456 return (EINVAL); 1457 1458 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 1459 return (EROFS); 1460 1461 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1462 ap->a_cred, ap->a_td, VWRITE); 1463 if (error) { 1464 1465 /* 1466 * ffs_lock_ea is not needed there, because the vnode 1467 * must be exclusively locked. 1468 */ 1469 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1470 ip->i_ea_error = error; 1471 return (error); 1472 } 1473 1474 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1475 if (error) 1476 return (error); 1477 1478 ealength = eapad1 = ealen = eapad2 = 0; 1479 1480 eae = malloc(ip->i_ea_len, M_TEMP, M_WAITOK); 1481 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1482 easize = ip->i_ea_len; 1483 1484 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1485 &p, NULL); 1486 if (olen == -1) { 1487 /* delete but nonexistent */ 1488 free(eae, M_TEMP); 1489 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1490 return(ENOATTR); 1491 } 1492 bcopy(p, &ul, sizeof ul); 1493 i = p - eae + ul; 1494 if (ul != ealength) { 1495 bcopy(p + ul, p + ealength, easize - i); 1496 easize += (ealength - ul); 1497 } 1498 if (easize > NXADDR * fs->fs_bsize) { 1499 free(eae, M_TEMP); 1500 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1501 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1502 ip->i_ea_error = ENOSPC; 1503 return(ENOSPC); 1504 } 1505 p = ip->i_ea_area; 1506 ip->i_ea_area = eae; 1507 ip->i_ea_len = easize; 1508 free(p, M_TEMP); 1509 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td); 1510 return(error); 1511 } 1512 1513 /* 1514 * Vnode operation to retrieve a named extended attribute. 1515 */ 1516 static int 1517 ffs_getextattr(struct vop_getextattr_args *ap) 1518 /* 1519 vop_getextattr { 1520 IN struct vnode *a_vp; 1521 IN int a_attrnamespace; 1522 IN const char *a_name; 1523 INOUT struct uio *a_uio; 1524 OUT size_t *a_size; 1525 IN struct ucred *a_cred; 1526 IN struct thread *a_td; 1527 }; 1528 */ 1529 { 1530 struct inode *ip; 1531 struct fs *fs; 1532 u_char *eae, *p; 1533 unsigned easize; 1534 int error, ealen; 1535 1536 ip = VTOI(ap->a_vp); 1537 fs = ip->i_fs; 1538 1539 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1540 return (EOPNOTSUPP); 1541 1542 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1543 ap->a_cred, ap->a_td, VREAD); 1544 if (error) 1545 return (error); 1546 1547 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1548 if (error) 1549 return (error); 1550 1551 eae = ip->i_ea_area; 1552 easize = ip->i_ea_len; 1553 1554 ealen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1555 NULL, &p); 1556 if (ealen >= 0) { 1557 error = 0; 1558 if (ap->a_size != NULL) 1559 *ap->a_size = ealen; 1560 else if (ap->a_uio != NULL) 1561 error = uiomove(p, ealen, ap->a_uio); 1562 } else 1563 error = ENOATTR; 1564 1565 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1566 return(error); 1567 } 1568 1569 /* 1570 * Vnode operation to retrieve extended attributes on a vnode. 1571 */ 1572 static int 1573 ffs_listextattr(struct vop_listextattr_args *ap) 1574 /* 1575 vop_listextattr { 1576 IN struct vnode *a_vp; 1577 IN int a_attrnamespace; 1578 INOUT struct uio *a_uio; 1579 OUT size_t *a_size; 1580 IN struct ucred *a_cred; 1581 IN struct thread *a_td; 1582 }; 1583 */ 1584 { 1585 struct inode *ip; 1586 struct fs *fs; 1587 u_char *eae, *p, *pe, *pn; 1588 unsigned easize; 1589 uint32_t ul; 1590 int error, ealen; 1591 1592 ip = VTOI(ap->a_vp); 1593 fs = ip->i_fs; 1594 1595 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1596 return (EOPNOTSUPP); 1597 1598 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1599 ap->a_cred, ap->a_td, VREAD); 1600 if (error) 1601 return (error); 1602 1603 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1604 if (error) 1605 return (error); 1606 eae = ip->i_ea_area; 1607 easize = ip->i_ea_len; 1608 1609 error = 0; 1610 if (ap->a_size != NULL) 1611 *ap->a_size = 0; 1612 pe = eae + easize; 1613 for(p = eae; error == 0 && p < pe; p = pn) { 1614 bcopy(p, &ul, sizeof(ul)); 1615 pn = p + ul; 1616 if (pn > pe) 1617 break; 1618 p += sizeof(ul); 1619 if (*p++ != ap->a_attrnamespace) 1620 continue; 1621 p++; /* pad2 */ 1622 ealen = *p; 1623 if (ap->a_size != NULL) { 1624 *ap->a_size += ealen + 1; 1625 } else if (ap->a_uio != NULL) { 1626 error = uiomove(p, ealen + 1, ap->a_uio); 1627 } 1628 } 1629 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1630 return(error); 1631 } 1632 1633 /* 1634 * Vnode operation to set a named attribute. 1635 */ 1636 static int 1637 ffs_setextattr(struct vop_setextattr_args *ap) 1638 /* 1639 vop_setextattr { 1640 IN struct vnode *a_vp; 1641 IN int a_attrnamespace; 1642 IN const char *a_name; 1643 INOUT struct uio *a_uio; 1644 IN struct ucred *a_cred; 1645 IN struct thread *a_td; 1646 }; 1647 */ 1648 { 1649 struct inode *ip; 1650 struct fs *fs; 1651 uint32_t ealength, ul; 1652 int ealen, olen, eapad1, eapad2, error, i, easize; 1653 u_char *eae, *p; 1654 1655 ip = VTOI(ap->a_vp); 1656 fs = ip->i_fs; 1657 1658 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1659 return (EOPNOTSUPP); 1660 1661 if (strlen(ap->a_name) == 0) 1662 return (EINVAL); 1663 1664 /* XXX Now unsupported API to delete EAs using NULL uio. */ 1665 if (ap->a_uio == NULL) 1666 return (EOPNOTSUPP); 1667 1668 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) 1669 return (EROFS); 1670 1671 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1672 ap->a_cred, ap->a_td, VWRITE); 1673 if (error) { 1674 1675 /* 1676 * ffs_lock_ea is not needed there, because the vnode 1677 * must be exclusively locked. 1678 */ 1679 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1680 ip->i_ea_error = error; 1681 return (error); 1682 } 1683 1684 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1685 if (error) 1686 return (error); 1687 1688 ealen = ap->a_uio->uio_resid; 1689 ealength = sizeof(uint32_t) + 3 + strlen(ap->a_name); 1690 eapad1 = 8 - (ealength % 8); 1691 if (eapad1 == 8) 1692 eapad1 = 0; 1693 eapad2 = 8 - (ealen % 8); 1694 if (eapad2 == 8) 1695 eapad2 = 0; 1696 ealength += eapad1 + ealen + eapad2; 1697 1698 eae = malloc(ip->i_ea_len + ealength, M_TEMP, M_WAITOK); 1699 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1700 easize = ip->i_ea_len; 1701 1702 olen = ffs_findextattr(eae, easize, 1703 ap->a_attrnamespace, ap->a_name, &p, NULL); 1704 if (olen == -1) { 1705 /* new, append at end */ 1706 p = eae + easize; 1707 easize += ealength; 1708 } else { 1709 bcopy(p, &ul, sizeof ul); 1710 i = p - eae + ul; 1711 if (ul != ealength) { 1712 bcopy(p + ul, p + ealength, easize - i); 1713 easize += (ealength - ul); 1714 } 1715 } 1716 if (easize > NXADDR * fs->fs_bsize) { 1717 free(eae, M_TEMP); 1718 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1719 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1720 ip->i_ea_error = ENOSPC; 1721 return(ENOSPC); 1722 } 1723 bcopy(&ealength, p, sizeof(ealength)); 1724 p += sizeof(ealength); 1725 *p++ = ap->a_attrnamespace; 1726 *p++ = eapad2; 1727 *p++ = strlen(ap->a_name); 1728 strcpy(p, ap->a_name); 1729 p += strlen(ap->a_name); 1730 bzero(p, eapad1); 1731 p += eapad1; 1732 error = uiomove(p, ealen, ap->a_uio); 1733 if (error) { 1734 free(eae, M_TEMP); 1735 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1736 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1737 ip->i_ea_error = error; 1738 return(error); 1739 } 1740 p += ealen; 1741 bzero(p, eapad2); 1742 1743 p = ip->i_ea_area; 1744 ip->i_ea_area = eae; 1745 ip->i_ea_len = easize; 1746 free(p, M_TEMP); 1747 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td); 1748 return(error); 1749 } 1750 1751 /* 1752 * Vnode pointer to File handle 1753 */ 1754 static int 1755 ffs_vptofh(struct vop_vptofh_args *ap) 1756 /* 1757 vop_vptofh { 1758 IN struct vnode *a_vp; 1759 IN struct fid *a_fhp; 1760 }; 1761 */ 1762 { 1763 struct inode *ip; 1764 struct ufid *ufhp; 1765 1766 ip = VTOI(ap->a_vp); 1767 ufhp = (struct ufid *)ap->a_fhp; 1768 ufhp->ufid_len = sizeof(struct ufid); 1769 ufhp->ufid_ino = ip->i_number; 1770 ufhp->ufid_gen = ip->i_gen; 1771 return (0); 1772 }
Cache object: b3a3f35ac70d4f94803dbb74325979d0
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