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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/6.0/sys/ufs/ffs/ffs_vnops.c 151853 2005-10-29 07:00:45Z scottl $"); 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/proc.h> 78 #include <sys/resourcevar.h> 79 #include <sys/signalvar.h> 80 #include <sys/stat.h> 81 #include <sys/vmmeter.h> 82 #include <sys/vnode.h> 83 84 #include <vm/vm.h> 85 #include <vm/vm_extern.h> 86 #include <vm/vm_object.h> 87 #include <vm/vm_page.h> 88 #include <vm/vm_pager.h> 89 #include <vm/vnode_pager.h> 90 91 #include <ufs/ufs/extattr.h> 92 #include <ufs/ufs/quota.h> 93 #include <ufs/ufs/inode.h> 94 #include <ufs/ufs/ufs_extern.h> 95 #include <ufs/ufs/ufsmount.h> 96 97 #include <ufs/ffs/fs.h> 98 #include <ufs/ffs/ffs_extern.h> 99 #include "opt_directio.h" 100 #include "opt_ffs.h" 101 102 #ifdef DIRECTIO 103 extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone); 104 #endif 105 static vop_fsync_t ffs_fsync; 106 static vop_lock_t ffs_lock; 107 static vop_getpages_t ffs_getpages; 108 static vop_read_t ffs_read; 109 static vop_write_t ffs_write; 110 static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag); 111 static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, 112 struct ucred *cred); 113 static vop_strategy_t ffsext_strategy; 114 static vop_closeextattr_t ffs_closeextattr; 115 static vop_deleteextattr_t ffs_deleteextattr; 116 static vop_getextattr_t ffs_getextattr; 117 static vop_listextattr_t ffs_listextattr; 118 static vop_openextattr_t ffs_openextattr; 119 static vop_setextattr_t ffs_setextattr; 120 121 122 /* Global vfs data structures for ufs. */ 123 struct vop_vector ffs_vnodeops1 = { 124 .vop_default = &ufs_vnodeops, 125 .vop_fsync = ffs_fsync, 126 .vop_getpages = ffs_getpages, 127 .vop_lock = ffs_lock, 128 .vop_read = ffs_read, 129 .vop_reallocblks = ffs_reallocblks, 130 .vop_write = ffs_write, 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 }; 138 139 /* Global vfs data structures for ufs. */ 140 struct vop_vector ffs_vnodeops2 = { 141 .vop_default = &ufs_vnodeops, 142 .vop_fsync = ffs_fsync, 143 .vop_getpages = ffs_getpages, 144 .vop_lock = ffs_lock, 145 .vop_read = ffs_read, 146 .vop_reallocblks = ffs_reallocblks, 147 .vop_write = ffs_write, 148 .vop_closeextattr = ffs_closeextattr, 149 .vop_deleteextattr = ffs_deleteextattr, 150 .vop_getextattr = ffs_getextattr, 151 .vop_listextattr = ffs_listextattr, 152 .vop_openextattr = ffs_openextattr, 153 .vop_setextattr = ffs_setextattr, 154 }; 155 156 struct vop_vector ffs_fifoops2 = { 157 .vop_default = &ufs_fifoops, 158 .vop_fsync = ffs_fsync, 159 .vop_lock = ffs_lock, 160 .vop_reallocblks = ffs_reallocblks, 161 .vop_strategy = ffsext_strategy, 162 .vop_closeextattr = ffs_closeextattr, 163 .vop_deleteextattr = ffs_deleteextattr, 164 .vop_getextattr = ffs_getextattr, 165 .vop_listextattr = ffs_listextattr, 166 .vop_openextattr = ffs_openextattr, 167 .vop_setextattr = ffs_setextattr, 168 }; 169 170 /* 171 * Synch an open file. 172 */ 173 /* ARGSUSED */ 174 static int 175 ffs_fsync(struct vop_fsync_args *ap) 176 { 177 int error; 178 179 error = ffs_syncvnode(ap->a_vp, ap->a_waitfor); 180 if (error) 181 return (error); 182 if (ap->a_waitfor == MNT_WAIT && 183 (ap->a_vp->v_mount->mnt_flag & MNT_SOFTDEP)) 184 error = softdep_fsync(ap->a_vp); 185 return (error); 186 } 187 188 int 189 ffs_syncvnode(struct vnode *vp, int waitfor) 190 { 191 struct inode *ip = VTOI(vp); 192 struct buf *bp; 193 struct buf *nbp; 194 int s, error, wait, passes, skipmeta; 195 ufs_lbn_t lbn; 196 197 wait = (waitfor == MNT_WAIT); 198 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 199 200 /* 201 * Flush all dirty buffers associated with a vnode. 202 */ 203 passes = NIADDR + 1; 204 skipmeta = 0; 205 if (wait) 206 skipmeta = 1; 207 s = splbio(); 208 VI_LOCK(vp); 209 loop: 210 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) 211 bp->b_vflags &= ~BV_SCANNED; 212 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 213 /* 214 * Reasons to skip this buffer: it has already been considered 215 * on this pass, this pass is the first time through on a 216 * synchronous flush request and the buffer being considered 217 * is metadata, the buffer has dependencies that will cause 218 * it to be redirtied and it has not already been deferred, 219 * or it is already being written. 220 */ 221 if ((bp->b_vflags & BV_SCANNED) != 0) 222 continue; 223 bp->b_vflags |= BV_SCANNED; 224 if ((skipmeta == 1 && bp->b_lblkno < 0)) 225 continue; 226 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 227 continue; 228 VI_UNLOCK(vp); 229 if (!wait && LIST_FIRST(&bp->b_dep) != NULL && 230 (bp->b_flags & B_DEFERRED) == 0 && 231 buf_countdeps(bp, 0)) { 232 bp->b_flags |= B_DEFERRED; 233 BUF_UNLOCK(bp); 234 VI_LOCK(vp); 235 continue; 236 } 237 if ((bp->b_flags & B_DELWRI) == 0) 238 panic("ffs_fsync: not dirty"); 239 /* 240 * If this is a synchronous flush request, or it is not a 241 * file or device, start the write on this buffer immediatly. 242 */ 243 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) { 244 245 /* 246 * On our final pass through, do all I/O synchronously 247 * so that we can find out if our flush is failing 248 * because of write errors. 249 */ 250 if (passes > 0 || !wait) { 251 if ((bp->b_flags & B_CLUSTEROK) && !wait) { 252 (void) vfs_bio_awrite(bp); 253 } else { 254 bremfree(bp); 255 splx(s); 256 (void) bawrite(bp); 257 s = splbio(); 258 } 259 } else { 260 bremfree(bp); 261 splx(s); 262 if ((error = bwrite(bp)) != 0) 263 return (error); 264 s = splbio(); 265 } 266 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 267 /* 268 * If the buffer is for data that has been truncated 269 * off the file, then throw it away. 270 */ 271 bremfree(bp); 272 bp->b_flags |= B_INVAL | B_NOCACHE; 273 splx(s); 274 brelse(bp); 275 s = splbio(); 276 } else 277 vfs_bio_awrite(bp); 278 279 /* 280 * Since we may have slept during the I/O, we need 281 * to start from a known point. 282 */ 283 VI_LOCK(vp); 284 nbp = TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd); 285 } 286 /* 287 * If we were asked to do this synchronously, then go back for 288 * another pass, this time doing the metadata. 289 */ 290 if (skipmeta) { 291 skipmeta = 0; 292 goto loop; 293 } 294 295 if (wait) { 296 bufobj_wwait(&vp->v_bufobj, 3, 0); 297 VI_UNLOCK(vp); 298 299 /* 300 * Ensure that any filesystem metatdata associated 301 * with the vnode has been written. 302 */ 303 splx(s); 304 if ((error = softdep_sync_metadata(vp)) != 0) 305 return (error); 306 s = splbio(); 307 308 VI_LOCK(vp); 309 if (vp->v_bufobj.bo_dirty.bv_cnt > 0) { 310 /* 311 * Block devices associated with filesystems may 312 * have new I/O requests posted for them even if 313 * the vnode is locked, so no amount of trying will 314 * get them clean. Thus we give block devices a 315 * good effort, then just give up. For all other file 316 * types, go around and try again until it is clean. 317 */ 318 if (passes > 0) { 319 passes -= 1; 320 goto loop; 321 } 322 #ifdef DIAGNOSTIC 323 if (!vn_isdisk(vp, NULL)) 324 vprint("ffs_fsync: dirty", vp); 325 #endif 326 } 327 } 328 VI_UNLOCK(vp); 329 splx(s); 330 return (ffs_update(vp, wait)); 331 } 332 333 static int 334 ffs_lock(ap) 335 struct vop_lock_args /* { 336 struct vnode *a_vp; 337 int a_flags; 338 struct thread *a_td; 339 } */ *ap; 340 { 341 return (VOP_LOCK_APV(&ufs_vnodeops, ap)); 342 } 343 344 /* 345 * Vnode op for reading. 346 */ 347 /* ARGSUSED */ 348 static int 349 ffs_read(ap) 350 struct vop_read_args /* { 351 struct vnode *a_vp; 352 struct uio *a_uio; 353 int a_ioflag; 354 struct ucred *a_cred; 355 } */ *ap; 356 { 357 struct vnode *vp; 358 struct inode *ip; 359 struct uio *uio; 360 struct fs *fs; 361 struct buf *bp; 362 ufs_lbn_t lbn, nextlbn; 363 off_t bytesinfile; 364 long size, xfersize, blkoffset; 365 int error, orig_resid; 366 int seqcount; 367 int ioflag; 368 369 vp = ap->a_vp; 370 uio = ap->a_uio; 371 ioflag = ap->a_ioflag; 372 if (ap->a_ioflag & IO_EXT) 373 #ifdef notyet 374 return (ffs_extread(vp, uio, ioflag)); 375 #else 376 panic("ffs_read+IO_EXT"); 377 #endif 378 #ifdef DIRECTIO 379 if ((ioflag & IO_DIRECT) != 0) { 380 int workdone; 381 382 error = ffs_rawread(vp, uio, &workdone); 383 if (error != 0 || workdone != 0) 384 return error; 385 } 386 #endif 387 388 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 389 ip = VTOI(vp); 390 391 #ifdef DIAGNOSTIC 392 if (uio->uio_rw != UIO_READ) 393 panic("ffs_read: mode"); 394 395 if (vp->v_type == VLNK) { 396 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 397 panic("ffs_read: short symlink"); 398 } else if (vp->v_type != VREG && vp->v_type != VDIR) 399 panic("ffs_read: type %d", vp->v_type); 400 #endif 401 orig_resid = uio->uio_resid; 402 KASSERT(orig_resid >= 0, ("ffs_read: uio->uio_resid < 0")); 403 if (orig_resid == 0) 404 return (0); 405 KASSERT(uio->uio_offset >= 0, ("ffs_read: uio->uio_offset < 0")); 406 fs = ip->i_fs; 407 if (uio->uio_offset < ip->i_size && 408 uio->uio_offset >= fs->fs_maxfilesize) 409 return (EOVERFLOW); 410 411 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 412 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 413 break; 414 lbn = lblkno(fs, uio->uio_offset); 415 nextlbn = lbn + 1; 416 417 /* 418 * size of buffer. The buffer representing the 419 * end of the file is rounded up to the size of 420 * the block type ( fragment or full block, 421 * depending ). 422 */ 423 size = blksize(fs, ip, lbn); 424 blkoffset = blkoff(fs, uio->uio_offset); 425 426 /* 427 * The amount we want to transfer in this iteration is 428 * one FS block less the amount of the data before 429 * our startpoint (duh!) 430 */ 431 xfersize = fs->fs_bsize - blkoffset; 432 433 /* 434 * But if we actually want less than the block, 435 * or the file doesn't have a whole block more of data, 436 * then use the lesser number. 437 */ 438 if (uio->uio_resid < xfersize) 439 xfersize = uio->uio_resid; 440 if (bytesinfile < xfersize) 441 xfersize = bytesinfile; 442 443 if (lblktosize(fs, nextlbn) >= ip->i_size) { 444 /* 445 * Don't do readahead if this is the end of the file. 446 */ 447 error = bread(vp, lbn, size, NOCRED, &bp); 448 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 449 /* 450 * Otherwise if we are allowed to cluster, 451 * grab as much as we can. 452 * 453 * XXX This may not be a win if we are not 454 * doing sequential access. 455 */ 456 error = cluster_read(vp, ip->i_size, lbn, 457 size, NOCRED, blkoffset + uio->uio_resid, seqcount, &bp); 458 } else if (seqcount > 1) { 459 /* 460 * If we are NOT allowed to cluster, then 461 * if we appear to be acting sequentially, 462 * fire off a request for a readahead 463 * as well as a read. Note that the 4th and 5th 464 * arguments point to arrays of the size specified in 465 * the 6th argument. 466 */ 467 int nextsize = blksize(fs, ip, nextlbn); 468 error = breadn(vp, lbn, 469 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 470 } else { 471 /* 472 * Failing all of the above, just read what the 473 * user asked for. Interestingly, the same as 474 * the first option above. 475 */ 476 error = bread(vp, lbn, size, NOCRED, &bp); 477 } 478 if (error) { 479 brelse(bp); 480 bp = NULL; 481 break; 482 } 483 484 /* 485 * If IO_DIRECT then set B_DIRECT for the buffer. This 486 * will cause us to attempt to release the buffer later on 487 * and will cause the buffer cache to attempt to free the 488 * underlying pages. 489 */ 490 if (ioflag & IO_DIRECT) 491 bp->b_flags |= B_DIRECT; 492 493 /* 494 * We should only get non-zero b_resid when an I/O error 495 * has occurred, which should cause us to break above. 496 * However, if the short read did not cause an error, 497 * then we want to ensure that we do not uiomove bad 498 * or uninitialized data. 499 */ 500 size -= bp->b_resid; 501 if (size < xfersize) { 502 if (size == 0) 503 break; 504 xfersize = size; 505 } 506 507 error = uiomove((char *)bp->b_data + blkoffset, 508 (int)xfersize, uio); 509 if (error) 510 break; 511 512 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 513 (LIST_FIRST(&bp->b_dep) == NULL)) { 514 /* 515 * If there are no dependencies, and it's VMIO, 516 * then we don't need the buf, mark it available 517 * for freeing. The VM has the data. 518 */ 519 bp->b_flags |= B_RELBUF; 520 brelse(bp); 521 } else { 522 /* 523 * Otherwise let whoever 524 * made the request take care of 525 * freeing it. We just queue 526 * it onto another list. 527 */ 528 bqrelse(bp); 529 } 530 } 531 532 /* 533 * This can only happen in the case of an error 534 * because the loop above resets bp to NULL on each iteration 535 * and on normal completion has not set a new value into it. 536 * so it must have come from a 'break' statement 537 */ 538 if (bp != NULL) { 539 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 540 (LIST_FIRST(&bp->b_dep) == NULL)) { 541 bp->b_flags |= B_RELBUF; 542 brelse(bp); 543 } else { 544 bqrelse(bp); 545 } 546 } 547 548 if ((error == 0 || uio->uio_resid != orig_resid) && 549 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 550 ip->i_flag |= IN_ACCESS; 551 return (error); 552 } 553 554 /* 555 * Vnode op for writing. 556 */ 557 static int 558 ffs_write(ap) 559 struct vop_write_args /* { 560 struct vnode *a_vp; 561 struct uio *a_uio; 562 int a_ioflag; 563 struct ucred *a_cred; 564 } */ *ap; 565 { 566 struct vnode *vp; 567 struct uio *uio; 568 struct inode *ip; 569 struct fs *fs; 570 struct buf *bp; 571 struct thread *td; 572 ufs_lbn_t lbn; 573 off_t osize; 574 int seqcount; 575 int blkoffset, error, flags, ioflag, resid, size, xfersize; 576 577 vp = ap->a_vp; 578 uio = ap->a_uio; 579 ioflag = ap->a_ioflag; 580 if (ap->a_ioflag & IO_EXT) 581 #ifdef notyet 582 return (ffs_extwrite(vp, uio, ioflag, ap->a_cred)); 583 #else 584 panic("ffs_write+IO_EXT"); 585 #endif 586 587 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 588 ip = VTOI(vp); 589 590 #ifdef DIAGNOSTIC 591 if (uio->uio_rw != UIO_WRITE) 592 panic("ffs_write: mode"); 593 #endif 594 595 switch (vp->v_type) { 596 case VREG: 597 if (ioflag & IO_APPEND) 598 uio->uio_offset = ip->i_size; 599 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 600 return (EPERM); 601 /* FALLTHROUGH */ 602 case VLNK: 603 break; 604 case VDIR: 605 panic("ffs_write: dir write"); 606 break; 607 default: 608 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type, 609 (int)uio->uio_offset, 610 (int)uio->uio_resid 611 ); 612 } 613 614 KASSERT(uio->uio_resid >= 0, ("ffs_write: uio->uio_resid < 0")); 615 KASSERT(uio->uio_offset >= 0, ("ffs_write: uio->uio_offset < 0")); 616 fs = ip->i_fs; 617 if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) 618 return (EFBIG); 619 /* 620 * Maybe this should be above the vnode op call, but so long as 621 * file servers have no limits, I don't think it matters. 622 */ 623 td = uio->uio_td; 624 if (vp->v_type == VREG && td != NULL) { 625 PROC_LOCK(td->td_proc); 626 if (uio->uio_offset + uio->uio_resid > 627 lim_cur(td->td_proc, RLIMIT_FSIZE)) { 628 psignal(td->td_proc, SIGXFSZ); 629 PROC_UNLOCK(td->td_proc); 630 return (EFBIG); 631 } 632 PROC_UNLOCK(td->td_proc); 633 } 634 635 resid = uio->uio_resid; 636 osize = ip->i_size; 637 if (seqcount > BA_SEQMAX) 638 flags = BA_SEQMAX << BA_SEQSHIFT; 639 else 640 flags = seqcount << BA_SEQSHIFT; 641 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 642 flags |= IO_SYNC; 643 644 for (error = 0; uio->uio_resid > 0;) { 645 lbn = lblkno(fs, uio->uio_offset); 646 blkoffset = blkoff(fs, uio->uio_offset); 647 xfersize = fs->fs_bsize - blkoffset; 648 if (uio->uio_resid < xfersize) 649 xfersize = uio->uio_resid; 650 if (uio->uio_offset + xfersize > ip->i_size) 651 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 652 653 /* 654 * We must perform a read-before-write if the transfer size 655 * does not cover the entire buffer. 656 */ 657 if (fs->fs_bsize > xfersize) 658 flags |= BA_CLRBUF; 659 else 660 flags &= ~BA_CLRBUF; 661 /* XXX is uio->uio_offset the right thing here? */ 662 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 663 ap->a_cred, flags, &bp); 664 if (error != 0) 665 break; 666 /* 667 * If the buffer is not valid we have to clear out any 668 * garbage data from the pages instantiated for the buffer. 669 * If we do not, a failed uiomove() during a write can leave 670 * the prior contents of the pages exposed to a userland 671 * mmap(). XXX deal with uiomove() errors a better way. 672 */ 673 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 674 vfs_bio_clrbuf(bp); 675 if (ioflag & IO_DIRECT) 676 bp->b_flags |= B_DIRECT; 677 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 678 bp->b_flags |= B_NOCACHE; 679 680 if (uio->uio_offset + xfersize > ip->i_size) { 681 ip->i_size = uio->uio_offset + xfersize; 682 DIP_SET(ip, i_size, ip->i_size); 683 } 684 685 size = blksize(fs, ip, lbn) - bp->b_resid; 686 if (size < xfersize) 687 xfersize = size; 688 689 error = 690 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 691 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 692 (LIST_FIRST(&bp->b_dep) == NULL)) { 693 bp->b_flags |= B_RELBUF; 694 } 695 696 /* 697 * If IO_SYNC each buffer is written synchronously. Otherwise 698 * if we have a severe page deficiency write the buffer 699 * asynchronously. Otherwise try to cluster, and if that 700 * doesn't do it then either do an async write (if O_DIRECT), 701 * or a delayed write (if not). 702 */ 703 if (ioflag & IO_SYNC) { 704 (void)bwrite(bp); 705 } else if (vm_page_count_severe() || 706 buf_dirty_count_severe() || 707 (ioflag & IO_ASYNC)) { 708 bp->b_flags |= B_CLUSTEROK; 709 bawrite(bp); 710 } else if (xfersize + blkoffset == fs->fs_bsize) { 711 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 712 bp->b_flags |= B_CLUSTEROK; 713 cluster_write(vp, bp, ip->i_size, seqcount); 714 } else { 715 bawrite(bp); 716 } 717 } else if (ioflag & IO_DIRECT) { 718 bp->b_flags |= B_CLUSTEROK; 719 bawrite(bp); 720 } else { 721 bp->b_flags |= B_CLUSTEROK; 722 bdwrite(bp); 723 } 724 if (error || xfersize == 0) 725 break; 726 ip->i_flag |= IN_CHANGE | IN_UPDATE; 727 } 728 /* 729 * If we successfully wrote any data, and we are not the superuser 730 * we clear the setuid and setgid bits as a precaution against 731 * tampering. 732 */ 733 if (resid > uio->uio_resid && ap->a_cred && 734 suser_cred(ap->a_cred, SUSER_ALLOWJAIL)) { 735 ip->i_mode &= ~(ISUID | ISGID); 736 DIP_SET(ip, i_mode, ip->i_mode); 737 } 738 if (error) { 739 if (ioflag & IO_UNIT) { 740 (void)ffs_truncate(vp, osize, 741 IO_NORMAL | (ioflag & IO_SYNC), 742 ap->a_cred, uio->uio_td); 743 uio->uio_offset -= resid - uio->uio_resid; 744 uio->uio_resid = resid; 745 } 746 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 747 error = ffs_update(vp, 1); 748 return (error); 749 } 750 751 /* 752 * get page routine 753 */ 754 static int 755 ffs_getpages(ap) 756 struct vop_getpages_args *ap; 757 { 758 int i; 759 vm_page_t mreq; 760 int pcount; 761 762 pcount = round_page(ap->a_count) / PAGE_SIZE; 763 mreq = ap->a_m[ap->a_reqpage]; 764 765 /* 766 * if ANY DEV_BSIZE blocks are valid on a large filesystem block, 767 * then the entire page is valid. Since the page may be mapped, 768 * user programs might reference data beyond the actual end of file 769 * occuring within the page. We have to zero that data. 770 */ 771 VM_OBJECT_LOCK(mreq->object); 772 if (mreq->valid) { 773 if (mreq->valid != VM_PAGE_BITS_ALL) 774 vm_page_zero_invalid(mreq, TRUE); 775 vm_page_lock_queues(); 776 for (i = 0; i < pcount; i++) { 777 if (i != ap->a_reqpage) { 778 vm_page_free(ap->a_m[i]); 779 } 780 } 781 vm_page_unlock_queues(); 782 VM_OBJECT_UNLOCK(mreq->object); 783 return VM_PAGER_OK; 784 } 785 VM_OBJECT_UNLOCK(mreq->object); 786 787 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 788 ap->a_count, 789 ap->a_reqpage); 790 } 791 792 793 /* 794 * Extended attribute area reading. 795 */ 796 static int 797 ffs_extread(struct vnode *vp, struct uio *uio, int ioflag) 798 { 799 struct inode *ip; 800 struct ufs2_dinode *dp; 801 struct fs *fs; 802 struct buf *bp; 803 ufs_lbn_t lbn, nextlbn; 804 off_t bytesinfile; 805 long size, xfersize, blkoffset; 806 int error, orig_resid; 807 808 ip = VTOI(vp); 809 fs = ip->i_fs; 810 dp = ip->i_din2; 811 812 #ifdef DIAGNOSTIC 813 if (uio->uio_rw != UIO_READ || fs->fs_magic != FS_UFS2_MAGIC) 814 panic("ffs_extread: mode"); 815 816 #endif 817 orig_resid = uio->uio_resid; 818 KASSERT(orig_resid >= 0, ("ffs_extread: uio->uio_resid < 0")); 819 if (orig_resid == 0) 820 return (0); 821 KASSERT(uio->uio_offset >= 0, ("ffs_extread: uio->uio_offset < 0")); 822 823 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 824 if ((bytesinfile = dp->di_extsize - uio->uio_offset) <= 0) 825 break; 826 lbn = lblkno(fs, uio->uio_offset); 827 nextlbn = lbn + 1; 828 829 /* 830 * size of buffer. The buffer representing the 831 * end of the file is rounded up to the size of 832 * the block type ( fragment or full block, 833 * depending ). 834 */ 835 size = sblksize(fs, dp->di_extsize, lbn); 836 blkoffset = blkoff(fs, uio->uio_offset); 837 838 /* 839 * The amount we want to transfer in this iteration is 840 * one FS block less the amount of the data before 841 * our startpoint (duh!) 842 */ 843 xfersize = fs->fs_bsize - blkoffset; 844 845 /* 846 * But if we actually want less than the block, 847 * or the file doesn't have a whole block more of data, 848 * then use the lesser number. 849 */ 850 if (uio->uio_resid < xfersize) 851 xfersize = uio->uio_resid; 852 if (bytesinfile < xfersize) 853 xfersize = bytesinfile; 854 855 if (lblktosize(fs, nextlbn) >= dp->di_extsize) { 856 /* 857 * Don't do readahead if this is the end of the info. 858 */ 859 error = bread(vp, -1 - lbn, size, NOCRED, &bp); 860 } else { 861 /* 862 * If we have a second block, then 863 * fire off a request for a readahead 864 * as well as a read. Note that the 4th and 5th 865 * arguments point to arrays of the size specified in 866 * the 6th argument. 867 */ 868 int nextsize = sblksize(fs, dp->di_extsize, nextlbn); 869 870 nextlbn = -1 - nextlbn; 871 error = breadn(vp, -1 - lbn, 872 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 873 } 874 if (error) { 875 brelse(bp); 876 bp = NULL; 877 break; 878 } 879 880 /* 881 * If IO_DIRECT then set B_DIRECT for the buffer. This 882 * will cause us to attempt to release the buffer later on 883 * and will cause the buffer cache to attempt to free the 884 * underlying pages. 885 */ 886 if (ioflag & IO_DIRECT) 887 bp->b_flags |= B_DIRECT; 888 889 /* 890 * We should only get non-zero b_resid when an I/O error 891 * has occurred, which should cause us to break above. 892 * However, if the short read did not cause an error, 893 * then we want to ensure that we do not uiomove bad 894 * or uninitialized data. 895 */ 896 size -= bp->b_resid; 897 if (size < xfersize) { 898 if (size == 0) 899 break; 900 xfersize = size; 901 } 902 903 error = uiomove((char *)bp->b_data + blkoffset, 904 (int)xfersize, uio); 905 if (error) 906 break; 907 908 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 909 (LIST_FIRST(&bp->b_dep) == NULL)) { 910 /* 911 * If there are no dependencies, and it's VMIO, 912 * then we don't need the buf, mark it available 913 * for freeing. The VM has the data. 914 */ 915 bp->b_flags |= B_RELBUF; 916 brelse(bp); 917 } else { 918 /* 919 * Otherwise let whoever 920 * made the request take care of 921 * freeing it. We just queue 922 * it onto another list. 923 */ 924 bqrelse(bp); 925 } 926 } 927 928 /* 929 * This can only happen in the case of an error 930 * because the loop above resets bp to NULL on each iteration 931 * and on normal completion has not set a new value into it. 932 * so it must have come from a 'break' statement 933 */ 934 if (bp != NULL) { 935 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 936 (LIST_FIRST(&bp->b_dep) == NULL)) { 937 bp->b_flags |= B_RELBUF; 938 brelse(bp); 939 } else { 940 bqrelse(bp); 941 } 942 } 943 944 if ((error == 0 || uio->uio_resid != orig_resid) && 945 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 946 ip->i_flag |= IN_ACCESS; 947 return (error); 948 } 949 950 /* 951 * Extended attribute area writing. 952 */ 953 static int 954 ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred) 955 { 956 struct inode *ip; 957 struct ufs2_dinode *dp; 958 struct fs *fs; 959 struct buf *bp; 960 ufs_lbn_t lbn; 961 off_t osize; 962 int blkoffset, error, flags, resid, size, xfersize; 963 964 ip = VTOI(vp); 965 fs = ip->i_fs; 966 dp = ip->i_din2; 967 968 #ifdef DIAGNOSTIC 969 if (uio->uio_rw != UIO_WRITE || fs->fs_magic != FS_UFS2_MAGIC) 970 panic("ffs_extwrite: mode"); 971 #endif 972 973 if (ioflag & IO_APPEND) 974 uio->uio_offset = dp->di_extsize; 975 KASSERT(uio->uio_offset >= 0, ("ffs_extwrite: uio->uio_offset < 0")); 976 KASSERT(uio->uio_resid >= 0, ("ffs_extwrite: uio->uio_resid < 0")); 977 if ((uoff_t)uio->uio_offset + uio->uio_resid > NXADDR * fs->fs_bsize) 978 return (EFBIG); 979 980 resid = uio->uio_resid; 981 osize = dp->di_extsize; 982 flags = IO_EXT; 983 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 984 flags |= IO_SYNC; 985 986 for (error = 0; uio->uio_resid > 0;) { 987 lbn = lblkno(fs, uio->uio_offset); 988 blkoffset = blkoff(fs, uio->uio_offset); 989 xfersize = fs->fs_bsize - blkoffset; 990 if (uio->uio_resid < xfersize) 991 xfersize = uio->uio_resid; 992 993 /* 994 * We must perform a read-before-write if the transfer size 995 * does not cover the entire buffer. 996 */ 997 if (fs->fs_bsize > xfersize) 998 flags |= BA_CLRBUF; 999 else 1000 flags &= ~BA_CLRBUF; 1001 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 1002 ucred, flags, &bp); 1003 if (error != 0) 1004 break; 1005 /* 1006 * If the buffer is not valid we have to clear out any 1007 * garbage data from the pages instantiated for the buffer. 1008 * If we do not, a failed uiomove() during a write can leave 1009 * the prior contents of the pages exposed to a userland 1010 * mmap(). XXX deal with uiomove() errors a better way. 1011 */ 1012 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 1013 vfs_bio_clrbuf(bp); 1014 if (ioflag & IO_DIRECT) 1015 bp->b_flags |= B_DIRECT; 1016 1017 if (uio->uio_offset + xfersize > dp->di_extsize) 1018 dp->di_extsize = uio->uio_offset + xfersize; 1019 1020 size = sblksize(fs, dp->di_extsize, lbn) - bp->b_resid; 1021 if (size < xfersize) 1022 xfersize = size; 1023 1024 error = 1025 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1026 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 1027 (LIST_FIRST(&bp->b_dep) == NULL)) { 1028 bp->b_flags |= B_RELBUF; 1029 } 1030 1031 /* 1032 * If IO_SYNC each buffer is written synchronously. Otherwise 1033 * if we have a severe page deficiency write the buffer 1034 * asynchronously. Otherwise try to cluster, and if that 1035 * doesn't do it then either do an async write (if O_DIRECT), 1036 * or a delayed write (if not). 1037 */ 1038 if (ioflag & IO_SYNC) { 1039 (void)bwrite(bp); 1040 } else if (vm_page_count_severe() || 1041 buf_dirty_count_severe() || 1042 xfersize + blkoffset == fs->fs_bsize || 1043 (ioflag & (IO_ASYNC | IO_DIRECT))) 1044 bawrite(bp); 1045 else 1046 bdwrite(bp); 1047 if (error || xfersize == 0) 1048 break; 1049 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1050 } 1051 /* 1052 * If we successfully wrote any data, and we are not the superuser 1053 * we clear the setuid and setgid bits as a precaution against 1054 * tampering. 1055 */ 1056 if (resid > uio->uio_resid && ucred && 1057 suser_cred(ucred, SUSER_ALLOWJAIL)) { 1058 ip->i_mode &= ~(ISUID | ISGID); 1059 dp->di_mode = ip->i_mode; 1060 } 1061 if (error) { 1062 if (ioflag & IO_UNIT) { 1063 (void)ffs_truncate(vp, osize, 1064 IO_EXT | (ioflag&IO_SYNC), ucred, uio->uio_td); 1065 uio->uio_offset -= resid - uio->uio_resid; 1066 uio->uio_resid = resid; 1067 } 1068 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 1069 error = ffs_update(vp, 1); 1070 return (error); 1071 } 1072 1073 1074 /* 1075 * Vnode operating to retrieve a named extended attribute. 1076 * 1077 * Locate a particular EA (nspace:name) in the area (ptr:length), and return 1078 * the length of the EA, and possibly the pointer to the entry and to the data. 1079 */ 1080 static int 1081 ffs_findextattr(u_char *ptr, u_int length, int nspace, const char *name, u_char **eap, u_char **eac) 1082 { 1083 u_char *p, *pe, *pn, *p0; 1084 int eapad1, eapad2, ealength, ealen, nlen; 1085 uint32_t ul; 1086 1087 pe = ptr + length; 1088 nlen = strlen(name); 1089 1090 for (p = ptr; p < pe; p = pn) { 1091 p0 = p; 1092 bcopy(p, &ul, sizeof(ul)); 1093 pn = p + ul; 1094 /* make sure this entry is complete */ 1095 if (pn > pe) 1096 break; 1097 p += sizeof(uint32_t); 1098 if (*p != nspace) 1099 continue; 1100 p++; 1101 eapad2 = *p++; 1102 if (*p != nlen) 1103 continue; 1104 p++; 1105 if (bcmp(p, name, nlen)) 1106 continue; 1107 ealength = sizeof(uint32_t) + 3 + nlen; 1108 eapad1 = 8 - (ealength % 8); 1109 if (eapad1 == 8) 1110 eapad1 = 0; 1111 ealength += eapad1; 1112 ealen = ul - ealength - eapad2; 1113 p += nlen + eapad1; 1114 if (eap != NULL) 1115 *eap = p0; 1116 if (eac != NULL) 1117 *eac = p; 1118 return (ealen); 1119 } 1120 return(-1); 1121 } 1122 1123 static int 1124 ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td, int extra) 1125 { 1126 struct inode *ip; 1127 struct ufs2_dinode *dp; 1128 struct uio luio; 1129 struct iovec liovec; 1130 int easize, error; 1131 u_char *eae; 1132 1133 ip = VTOI(vp); 1134 dp = ip->i_din2; 1135 easize = dp->di_extsize; 1136 1137 eae = malloc(easize + extra, M_TEMP, M_WAITOK); 1138 1139 liovec.iov_base = eae; 1140 liovec.iov_len = easize; 1141 luio.uio_iov = &liovec; 1142 luio.uio_iovcnt = 1; 1143 luio.uio_offset = 0; 1144 luio.uio_resid = easize; 1145 luio.uio_segflg = UIO_SYSSPACE; 1146 luio.uio_rw = UIO_READ; 1147 luio.uio_td = td; 1148 1149 error = ffs_extread(vp, &luio, IO_EXT | IO_SYNC); 1150 if (error) { 1151 free(eae, M_TEMP); 1152 return(error); 1153 } 1154 *p = eae; 1155 return (0); 1156 } 1157 1158 static int 1159 ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td) 1160 { 1161 struct inode *ip; 1162 struct ufs2_dinode *dp; 1163 int error; 1164 1165 ip = VTOI(vp); 1166 1167 if (ip->i_ea_area != NULL) 1168 return (EBUSY); 1169 dp = ip->i_din2; 1170 error = ffs_rdextattr(&ip->i_ea_area, vp, td, 0); 1171 if (error) 1172 return (error); 1173 ip->i_ea_len = dp->di_extsize; 1174 ip->i_ea_error = 0; 1175 return (0); 1176 } 1177 1178 /* 1179 * Vnode extattr transaction commit/abort 1180 */ 1181 static int 1182 ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td) 1183 { 1184 struct inode *ip; 1185 struct uio luio; 1186 struct iovec liovec; 1187 int error; 1188 struct ufs2_dinode *dp; 1189 1190 ip = VTOI(vp); 1191 if (ip->i_ea_area == NULL) 1192 return (EINVAL); 1193 dp = ip->i_din2; 1194 error = ip->i_ea_error; 1195 if (commit && error == 0) { 1196 if (cred == NOCRED) 1197 cred = vp->v_mount->mnt_cred; 1198 liovec.iov_base = ip->i_ea_area; 1199 liovec.iov_len = ip->i_ea_len; 1200 luio.uio_iov = &liovec; 1201 luio.uio_iovcnt = 1; 1202 luio.uio_offset = 0; 1203 luio.uio_resid = ip->i_ea_len; 1204 luio.uio_segflg = UIO_SYSSPACE; 1205 luio.uio_rw = UIO_WRITE; 1206 luio.uio_td = td; 1207 /* XXX: I'm not happy about truncating to zero size */ 1208 if (ip->i_ea_len < dp->di_extsize) 1209 error = ffs_truncate(vp, 0, IO_EXT, cred, td); 1210 error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred); 1211 } 1212 free(ip->i_ea_area, M_TEMP); 1213 ip->i_ea_area = NULL; 1214 ip->i_ea_len = 0; 1215 ip->i_ea_error = 0; 1216 return (error); 1217 } 1218 1219 /* 1220 * Vnode extattr strategy routine for fifos. 1221 * 1222 * We need to check for a read or write of the external attributes. 1223 * Otherwise we just fall through and do the usual thing. 1224 */ 1225 static int 1226 ffsext_strategy(struct vop_strategy_args *ap) 1227 /* 1228 struct vop_strategy_args { 1229 struct vnodeop_desc *a_desc; 1230 struct vnode *a_vp; 1231 struct buf *a_bp; 1232 }; 1233 */ 1234 { 1235 struct vnode *vp; 1236 daddr_t lbn; 1237 1238 vp = ap->a_vp; 1239 lbn = ap->a_bp->b_lblkno; 1240 if (VTOI(vp)->i_fs->fs_magic == FS_UFS2_MAGIC && 1241 lbn < 0 && lbn >= -NXADDR) 1242 return (VOP_STRATEGY_APV(&ufs_vnodeops, ap)); 1243 if (vp->v_type == VFIFO) 1244 return (VOP_STRATEGY_APV(&ufs_fifoops, ap)); 1245 panic("spec nodes went here"); 1246 } 1247 1248 /* 1249 * Vnode extattr transaction commit/abort 1250 */ 1251 static int 1252 ffs_openextattr(struct vop_openextattr_args *ap) 1253 /* 1254 struct vop_openextattr_args { 1255 struct vnodeop_desc *a_desc; 1256 struct vnode *a_vp; 1257 IN struct ucred *a_cred; 1258 IN struct thread *a_td; 1259 }; 1260 */ 1261 { 1262 struct inode *ip; 1263 struct fs *fs; 1264 1265 ip = VTOI(ap->a_vp); 1266 fs = ip->i_fs; 1267 1268 if (ap->a_vp->v_type == VCHR) 1269 return (EOPNOTSUPP); 1270 1271 return (ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td)); 1272 } 1273 1274 1275 /* 1276 * Vnode extattr transaction commit/abort 1277 */ 1278 static int 1279 ffs_closeextattr(struct vop_closeextattr_args *ap) 1280 /* 1281 struct vop_closeextattr_args { 1282 struct vnodeop_desc *a_desc; 1283 struct vnode *a_vp; 1284 int a_commit; 1285 IN struct ucred *a_cred; 1286 IN struct thread *a_td; 1287 }; 1288 */ 1289 { 1290 struct inode *ip; 1291 struct fs *fs; 1292 1293 ip = VTOI(ap->a_vp); 1294 fs = ip->i_fs; 1295 1296 if (ap->a_vp->v_type == VCHR) 1297 return (EOPNOTSUPP); 1298 1299 return (ffs_close_ea(ap->a_vp, ap->a_commit, ap->a_cred, ap->a_td)); 1300 } 1301 1302 /* 1303 * Vnode operation to remove a named attribute. 1304 */ 1305 static int 1306 ffs_deleteextattr(struct vop_deleteextattr_args *ap) 1307 /* 1308 vop_deleteextattr { 1309 IN struct vnode *a_vp; 1310 IN int a_attrnamespace; 1311 IN const char *a_name; 1312 IN struct ucred *a_cred; 1313 IN struct thread *a_td; 1314 }; 1315 */ 1316 { 1317 struct inode *ip; 1318 struct fs *fs; 1319 uint32_t ealength, ul; 1320 int ealen, olen, eapad1, eapad2, error, i, easize; 1321 u_char *eae, *p; 1322 int stand_alone; 1323 1324 ip = VTOI(ap->a_vp); 1325 fs = ip->i_fs; 1326 1327 if (ap->a_vp->v_type == VCHR) 1328 return (EOPNOTSUPP); 1329 1330 if (strlen(ap->a_name) == 0) 1331 return (EINVAL); 1332 1333 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1334 ap->a_cred, ap->a_td, IWRITE); 1335 if (error) { 1336 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1337 ip->i_ea_error = error; 1338 return (error); 1339 } 1340 1341 if (ip->i_ea_area == NULL) { 1342 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1343 if (error) 1344 return (error); 1345 stand_alone = 1; 1346 } else { 1347 stand_alone = 0; 1348 } 1349 1350 ealength = eapad1 = ealen = eapad2 = 0; 1351 1352 eae = malloc(ip->i_ea_len, M_TEMP, M_WAITOK); 1353 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1354 easize = ip->i_ea_len; 1355 1356 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1357 &p, NULL); 1358 if (olen == -1) { 1359 /* delete but nonexistent */ 1360 free(eae, M_TEMP); 1361 if (stand_alone) 1362 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1363 return(ENOATTR); 1364 } 1365 bcopy(p, &ul, sizeof ul); 1366 i = p - eae + ul; 1367 if (ul != ealength) { 1368 bcopy(p + ul, p + ealength, easize - i); 1369 easize += (ealength - ul); 1370 } 1371 if (easize > NXADDR * fs->fs_bsize) { 1372 free(eae, M_TEMP); 1373 if (stand_alone) 1374 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1375 else if (ip->i_ea_error == 0) 1376 ip->i_ea_error = ENOSPC; 1377 return(ENOSPC); 1378 } 1379 p = ip->i_ea_area; 1380 ip->i_ea_area = eae; 1381 ip->i_ea_len = easize; 1382 free(p, M_TEMP); 1383 if (stand_alone) 1384 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td); 1385 return(error); 1386 } 1387 1388 /* 1389 * Vnode operation to retrieve a named extended attribute. 1390 */ 1391 static int 1392 ffs_getextattr(struct vop_getextattr_args *ap) 1393 /* 1394 vop_getextattr { 1395 IN struct vnode *a_vp; 1396 IN int a_attrnamespace; 1397 IN const char *a_name; 1398 INOUT struct uio *a_uio; 1399 OUT size_t *a_size; 1400 IN struct ucred *a_cred; 1401 IN struct thread *a_td; 1402 }; 1403 */ 1404 { 1405 struct inode *ip; 1406 struct fs *fs; 1407 u_char *eae, *p; 1408 unsigned easize; 1409 int error, ealen, stand_alone; 1410 1411 ip = VTOI(ap->a_vp); 1412 fs = ip->i_fs; 1413 1414 if (ap->a_vp->v_type == VCHR) 1415 return (EOPNOTSUPP); 1416 1417 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1418 ap->a_cred, ap->a_td, IREAD); 1419 if (error) 1420 return (error); 1421 1422 if (ip->i_ea_area == NULL) { 1423 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1424 if (error) 1425 return (error); 1426 stand_alone = 1; 1427 } else { 1428 stand_alone = 0; 1429 } 1430 eae = ip->i_ea_area; 1431 easize = ip->i_ea_len; 1432 1433 ealen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1434 NULL, &p); 1435 if (ealen >= 0) { 1436 error = 0; 1437 if (ap->a_size != NULL) 1438 *ap->a_size = ealen; 1439 else if (ap->a_uio != NULL) 1440 error = uiomove(p, ealen, ap->a_uio); 1441 } else 1442 error = ENOATTR; 1443 if (stand_alone) 1444 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1445 return(error); 1446 } 1447 1448 /* 1449 * Vnode operation to retrieve extended attributes on a vnode. 1450 */ 1451 static int 1452 ffs_listextattr(struct vop_listextattr_args *ap) 1453 /* 1454 vop_listextattr { 1455 IN struct vnode *a_vp; 1456 IN int a_attrnamespace; 1457 INOUT struct uio *a_uio; 1458 OUT size_t *a_size; 1459 IN struct ucred *a_cred; 1460 IN struct thread *a_td; 1461 }; 1462 */ 1463 { 1464 struct inode *ip; 1465 struct fs *fs; 1466 u_char *eae, *p, *pe, *pn; 1467 unsigned easize; 1468 uint32_t ul; 1469 int error, ealen, stand_alone; 1470 1471 ip = VTOI(ap->a_vp); 1472 fs = ip->i_fs; 1473 1474 if (ap->a_vp->v_type == VCHR) 1475 return (EOPNOTSUPP); 1476 1477 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1478 ap->a_cred, ap->a_td, IREAD); 1479 if (error) 1480 return (error); 1481 1482 if (ip->i_ea_area == NULL) { 1483 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1484 if (error) 1485 return (error); 1486 stand_alone = 1; 1487 } else { 1488 stand_alone = 0; 1489 } 1490 eae = ip->i_ea_area; 1491 easize = ip->i_ea_len; 1492 1493 error = 0; 1494 if (ap->a_size != NULL) 1495 *ap->a_size = 0; 1496 pe = eae + easize; 1497 for(p = eae; error == 0 && p < pe; p = pn) { 1498 bcopy(p, &ul, sizeof(ul)); 1499 pn = p + ul; 1500 if (pn > pe) 1501 break; 1502 p += sizeof(ul); 1503 if (*p++ != ap->a_attrnamespace) 1504 continue; 1505 p++; /* pad2 */ 1506 ealen = *p; 1507 if (ap->a_size != NULL) { 1508 *ap->a_size += ealen + 1; 1509 } else if (ap->a_uio != NULL) { 1510 error = uiomove(p, ealen + 1, ap->a_uio); 1511 } 1512 } 1513 if (stand_alone) 1514 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1515 return(error); 1516 } 1517 1518 /* 1519 * Vnode operation to set a named attribute. 1520 */ 1521 static int 1522 ffs_setextattr(struct vop_setextattr_args *ap) 1523 /* 1524 vop_setextattr { 1525 IN struct vnode *a_vp; 1526 IN int a_attrnamespace; 1527 IN const char *a_name; 1528 INOUT struct uio *a_uio; 1529 IN struct ucred *a_cred; 1530 IN struct thread *a_td; 1531 }; 1532 */ 1533 { 1534 struct inode *ip; 1535 struct fs *fs; 1536 uint32_t ealength, ul; 1537 int ealen, olen, eapad1, eapad2, error, i, easize; 1538 u_char *eae, *p; 1539 int stand_alone; 1540 1541 ip = VTOI(ap->a_vp); 1542 fs = ip->i_fs; 1543 1544 if (ap->a_vp->v_type == VCHR) 1545 return (EOPNOTSUPP); 1546 1547 if (strlen(ap->a_name) == 0) 1548 return (EINVAL); 1549 1550 /* XXX Now unsupported API to delete EAs using NULL uio. */ 1551 if (ap->a_uio == NULL) 1552 return (EOPNOTSUPP); 1553 1554 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1555 ap->a_cred, ap->a_td, IWRITE); 1556 if (error) { 1557 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1558 ip->i_ea_error = error; 1559 return (error); 1560 } 1561 1562 if (ip->i_ea_area == NULL) { 1563 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1564 if (error) 1565 return (error); 1566 stand_alone = 1; 1567 } else { 1568 stand_alone = 0; 1569 } 1570 1571 ealen = ap->a_uio->uio_resid; 1572 ealength = sizeof(uint32_t) + 3 + strlen(ap->a_name); 1573 eapad1 = 8 - (ealength % 8); 1574 if (eapad1 == 8) 1575 eapad1 = 0; 1576 eapad2 = 8 - (ealen % 8); 1577 if (eapad2 == 8) 1578 eapad2 = 0; 1579 ealength += eapad1 + ealen + eapad2; 1580 1581 eae = malloc(ip->i_ea_len + ealength, M_TEMP, M_WAITOK); 1582 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1583 easize = ip->i_ea_len; 1584 1585 olen = ffs_findextattr(eae, easize, 1586 ap->a_attrnamespace, ap->a_name, &p, NULL); 1587 if (olen == -1) { 1588 /* new, append at end */ 1589 p = eae + easize; 1590 easize += ealength; 1591 } else { 1592 bcopy(p, &ul, sizeof ul); 1593 i = p - eae + ul; 1594 if (ul != ealength) { 1595 bcopy(p + ul, p + ealength, easize - i); 1596 easize += (ealength - ul); 1597 } 1598 } 1599 if (easize > NXADDR * fs->fs_bsize) { 1600 free(eae, M_TEMP); 1601 if (stand_alone) 1602 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1603 else if (ip->i_ea_error == 0) 1604 ip->i_ea_error = ENOSPC; 1605 return(ENOSPC); 1606 } 1607 bcopy(&ealength, p, sizeof(ealength)); 1608 p += sizeof(ealength); 1609 *p++ = ap->a_attrnamespace; 1610 *p++ = eapad2; 1611 *p++ = strlen(ap->a_name); 1612 strcpy(p, ap->a_name); 1613 p += strlen(ap->a_name); 1614 bzero(p, eapad1); 1615 p += eapad1; 1616 error = uiomove(p, ealen, ap->a_uio); 1617 if (error) { 1618 free(eae, M_TEMP); 1619 if (stand_alone) 1620 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1621 else if (ip->i_ea_error == 0) 1622 ip->i_ea_error = error; 1623 return(error); 1624 } 1625 p += ealen; 1626 bzero(p, eapad2); 1627 1628 p = ip->i_ea_area; 1629 ip->i_ea_area = eae; 1630 ip->i_ea_len = easize; 1631 free(p, M_TEMP); 1632 if (stand_alone) 1633 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td); 1634 return(error); 1635 }
Cache object: c6d52c5e1d999408140ee4bda416a063
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