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sys/ufs/ffs/ffs_vnops.c
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1 /* 2 * Copyright (c) 2002 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 * Copyright (c) 1982, 1986, 1989, 1993 12 * The Regents of the University of California. All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95 43 * $FreeBSD: releng/5.0/sys/ufs/ffs/ffs_vnops.c 105422 2002-10-18 22:52:41Z dillon $ 44 */ 45 46 #include <sys/param.h> 47 #include <sys/bio.h> 48 #include <sys/systm.h> 49 #include <sys/buf.h> 50 #include <sys/conf.h> 51 #include <sys/extattr.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/mount.h> 55 #include <sys/proc.h> 56 #include <sys/resourcevar.h> 57 #include <sys/signalvar.h> 58 #include <sys/stat.h> 59 #include <sys/vmmeter.h> 60 #include <sys/vnode.h> 61 62 #include <machine/limits.h> 63 64 #include <vm/vm.h> 65 #include <vm/vm_extern.h> 66 #include <vm/vm_object.h> 67 #include <vm/vm_page.h> 68 #include <vm/vm_pager.h> 69 #include <vm/vnode_pager.h> 70 71 #include <ufs/ufs/extattr.h> 72 #include <ufs/ufs/quota.h> 73 #include <ufs/ufs/inode.h> 74 #include <ufs/ufs/ufs_extern.h> 75 #include <ufs/ufs/ufsmount.h> 76 77 #include <ufs/ffs/fs.h> 78 #include <ufs/ffs/ffs_extern.h> 79 80 static int ffs_fsync(struct vop_fsync_args *); 81 static int ffs_getpages(struct vop_getpages_args *); 82 static int ffs_read(struct vop_read_args *); 83 static int ffs_write(struct vop_write_args *); 84 static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag); 85 static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, 86 struct ucred *cred); 87 static int ffsext_strategy(struct vop_strategy_args *); 88 static int ffs_closeextattr(struct vop_closeextattr_args *); 89 static int ffs_getextattr(struct vop_getextattr_args *); 90 static int ffs_openextattr(struct vop_openextattr_args *); 91 static int ffs_setextattr(struct vop_setextattr_args *); 92 93 94 /* Global vfs data structures for ufs. */ 95 vop_t **ffs_vnodeop_p; 96 static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = { 97 { &vop_default_desc, (vop_t *) ufs_vnoperate }, 98 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 99 { &vop_getpages_desc, (vop_t *) ffs_getpages }, 100 { &vop_read_desc, (vop_t *) ffs_read }, 101 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, 102 { &vop_write_desc, (vop_t *) ffs_write }, 103 { &vop_closeextattr_desc, (vop_t *) ffs_closeextattr }, 104 { &vop_getextattr_desc, (vop_t *) ffs_getextattr }, 105 { &vop_openextattr_desc, (vop_t *) ffs_openextattr }, 106 { &vop_setextattr_desc, (vop_t *) ffs_setextattr }, 107 { NULL, NULL } 108 }; 109 static struct vnodeopv_desc ffs_vnodeop_opv_desc = 110 { &ffs_vnodeop_p, ffs_vnodeop_entries }; 111 112 vop_t **ffs_specop_p; 113 static struct vnodeopv_entry_desc ffs_specop_entries[] = { 114 { &vop_default_desc, (vop_t *) ufs_vnoperatespec }, 115 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 116 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, 117 { &vop_strategy_desc, (vop_t *) ffsext_strategy }, 118 { &vop_closeextattr_desc, (vop_t *) ffs_closeextattr }, 119 { &vop_getextattr_desc, (vop_t *) ffs_getextattr }, 120 { &vop_openextattr_desc, (vop_t *) ffs_openextattr }, 121 { &vop_setextattr_desc, (vop_t *) ffs_setextattr }, 122 { NULL, NULL } 123 }; 124 static struct vnodeopv_desc ffs_specop_opv_desc = 125 { &ffs_specop_p, ffs_specop_entries }; 126 127 vop_t **ffs_fifoop_p; 128 static struct vnodeopv_entry_desc ffs_fifoop_entries[] = { 129 { &vop_default_desc, (vop_t *) ufs_vnoperatefifo }, 130 { &vop_fsync_desc, (vop_t *) ffs_fsync }, 131 { &vop_reallocblks_desc, (vop_t *) ffs_reallocblks }, 132 { &vop_strategy_desc, (vop_t *) ffsext_strategy }, 133 { &vop_closeextattr_desc, (vop_t *) ffs_closeextattr }, 134 { &vop_getextattr_desc, (vop_t *) ffs_getextattr }, 135 { &vop_openextattr_desc, (vop_t *) ffs_openextattr }, 136 { &vop_setextattr_desc, (vop_t *) ffs_setextattr }, 137 { NULL, NULL } 138 }; 139 static struct vnodeopv_desc ffs_fifoop_opv_desc = 140 { &ffs_fifoop_p, ffs_fifoop_entries }; 141 142 VNODEOP_SET(ffs_vnodeop_opv_desc); 143 VNODEOP_SET(ffs_specop_opv_desc); 144 VNODEOP_SET(ffs_fifoop_opv_desc); 145 146 /* 147 * Synch an open file. 148 */ 149 /* ARGSUSED */ 150 static int 151 ffs_fsync(ap) 152 struct vop_fsync_args /* { 153 struct vnode *a_vp; 154 struct ucred *a_cred; 155 int a_waitfor; 156 struct thread *a_td; 157 } */ *ap; 158 { 159 struct vnode *vp = ap->a_vp; 160 struct inode *ip = VTOI(vp); 161 struct buf *bp; 162 struct buf *nbp; 163 int s, error, wait, passes, skipmeta; 164 ufs_lbn_t lbn; 165 166 wait = (ap->a_waitfor == MNT_WAIT); 167 if (vn_isdisk(vp, NULL)) { 168 lbn = INT_MAX; 169 if (vp->v_rdev->si_mountpoint != NULL && 170 (vp->v_rdev->si_mountpoint->mnt_flag & MNT_SOFTDEP)) 171 softdep_fsync_mountdev(vp); 172 } else { 173 lbn = lblkno(ip->i_fs, (ip->i_size + ip->i_fs->fs_bsize - 1)); 174 } 175 176 /* 177 * Flush all dirty buffers associated with a vnode. 178 */ 179 passes = NIADDR + 1; 180 skipmeta = 0; 181 if (wait) 182 skipmeta = 1; 183 s = splbio(); 184 VI_LOCK(vp); 185 loop: 186 TAILQ_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) 187 bp->b_flags &= ~B_SCANNED; 188 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 189 nbp = TAILQ_NEXT(bp, b_vnbufs); 190 /* 191 * Reasons to skip this buffer: it has already been considered 192 * on this pass, this pass is the first time through on a 193 * synchronous flush request and the buffer being considered 194 * is metadata, the buffer has dependencies that will cause 195 * it to be redirtied and it has not already been deferred, 196 * or it is already being written. 197 */ 198 if ((bp->b_flags & B_SCANNED) != 0) 199 continue; 200 bp->b_flags |= B_SCANNED; 201 if ((skipmeta == 1 && bp->b_lblkno < 0)) 202 continue; 203 if (!wait && LIST_FIRST(&bp->b_dep) != NULL && 204 (bp->b_flags & B_DEFERRED) == 0 && 205 buf_countdeps(bp, 0)) { 206 bp->b_flags |= B_DEFERRED; 207 continue; 208 } 209 VI_UNLOCK(vp); 210 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 211 VI_LOCK(vp); 212 continue; 213 } 214 if ((bp->b_flags & B_DELWRI) == 0) 215 panic("ffs_fsync: not dirty"); 216 if (vp != bp->b_vp) 217 panic("ffs_fsync: vp != vp->b_vp"); 218 /* 219 * If this is a synchronous flush request, or it is not a 220 * file or device, start the write on this buffer immediatly. 221 */ 222 if (wait || (vp->v_type != VREG && vp->v_type != VBLK)) { 223 224 /* 225 * On our final pass through, do all I/O synchronously 226 * so that we can find out if our flush is failing 227 * because of write errors. 228 */ 229 if (passes > 0 || !wait) { 230 if ((bp->b_flags & B_CLUSTEROK) && !wait) { 231 BUF_UNLOCK(bp); 232 (void) vfs_bio_awrite(bp); 233 } else { 234 bremfree(bp); 235 splx(s); 236 (void) bawrite(bp); 237 s = splbio(); 238 } 239 } else { 240 bremfree(bp); 241 splx(s); 242 if ((error = bwrite(bp)) != 0) 243 return (error); 244 s = splbio(); 245 } 246 } else if ((vp->v_type == VREG) && (bp->b_lblkno >= lbn)) { 247 /* 248 * If the buffer is for data that has been truncated 249 * off the file, then throw it away. 250 */ 251 bremfree(bp); 252 bp->b_flags |= B_INVAL | B_NOCACHE; 253 splx(s); 254 brelse(bp); 255 s = splbio(); 256 } else { 257 BUF_UNLOCK(bp); 258 vfs_bio_awrite(bp); 259 } 260 /* 261 * Since we may have slept during the I/O, we need 262 * to start from a known point. 263 */ 264 VI_LOCK(vp); 265 nbp = TAILQ_FIRST(&vp->v_dirtyblkhd); 266 } 267 /* 268 * If we were asked to do this synchronously, then go back for 269 * another pass, this time doing the metadata. 270 */ 271 if (skipmeta) { 272 skipmeta = 0; 273 goto loop; 274 } 275 276 if (wait) { 277 while (vp->v_numoutput) { 278 vp->v_iflag |= VI_BWAIT; 279 msleep((caddr_t)&vp->v_numoutput, VI_MTX(vp), 280 PRIBIO + 4, "ffsfsn", 0); 281 } 282 VI_UNLOCK(vp); 283 284 /* 285 * Ensure that any filesystem metatdata associated 286 * with the vnode has been written. 287 */ 288 splx(s); 289 if ((error = softdep_sync_metadata(ap)) != 0) 290 return (error); 291 s = splbio(); 292 293 VI_LOCK(vp); 294 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 295 /* 296 * Block devices associated with filesystems may 297 * have new I/O requests posted for them even if 298 * the vnode is locked, so no amount of trying will 299 * get them clean. Thus we give block devices a 300 * good effort, then just give up. For all other file 301 * types, go around and try again until it is clean. 302 */ 303 if (passes > 0) { 304 passes -= 1; 305 goto loop; 306 } 307 #ifdef DIAGNOSTIC 308 if (!vn_isdisk(vp, NULL)) 309 vprint("ffs_fsync: dirty", vp); 310 #endif 311 } 312 } 313 VI_UNLOCK(vp); 314 splx(s); 315 return (UFS_UPDATE(vp, wait)); 316 } 317 318 319 /* 320 * Vnode op for reading. 321 */ 322 /* ARGSUSED */ 323 static int 324 ffs_read(ap) 325 struct vop_read_args /* { 326 struct vnode *a_vp; 327 struct uio *a_uio; 328 int a_ioflag; 329 struct ucred *a_cred; 330 } */ *ap; 331 { 332 struct vnode *vp; 333 struct inode *ip; 334 struct uio *uio; 335 struct fs *fs; 336 struct buf *bp; 337 ufs_lbn_t lbn, nextlbn; 338 off_t bytesinfile; 339 long size, xfersize, blkoffset; 340 int error, orig_resid; 341 mode_t mode; 342 int seqcount; 343 int ioflag; 344 vm_object_t object; 345 346 vp = ap->a_vp; 347 uio = ap->a_uio; 348 ioflag = ap->a_ioflag; 349 if (ap->a_ioflag & IO_EXT) 350 #ifdef notyet 351 return (ffs_extread(vp, uio, ioflag)); 352 #else 353 panic("ffs_read+IO_EXT"); 354 #endif 355 356 GIANT_REQUIRED; 357 358 seqcount = ap->a_ioflag >> 16; 359 ip = VTOI(vp); 360 mode = ip->i_mode; 361 362 #ifdef DIAGNOSTIC 363 if (uio->uio_rw != UIO_READ) 364 panic("ffs_read: mode"); 365 366 if (vp->v_type == VLNK) { 367 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen) 368 panic("ffs_read: short symlink"); 369 } else if (vp->v_type != VREG && vp->v_type != VDIR) 370 panic("ffs_read: type %d", vp->v_type); 371 #endif 372 fs = ip->i_fs; 373 if ((u_int64_t)uio->uio_offset > fs->fs_maxfilesize) 374 return (EFBIG); 375 376 orig_resid = uio->uio_resid; 377 if (orig_resid <= 0) 378 return (0); 379 380 object = vp->v_object; 381 382 bytesinfile = ip->i_size - uio->uio_offset; 383 if (bytesinfile <= 0) { 384 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 385 ip->i_flag |= IN_ACCESS; 386 return 0; 387 } 388 389 if (object) { 390 vm_object_reference(object); 391 } 392 393 #ifdef ENABLE_VFS_IOOPT 394 /* 395 * If IO optimisation is turned on, 396 * and we are NOT a VM based IO request, 397 * (i.e. not headed for the buffer cache) 398 * but there IS a vm object associated with it. 399 */ 400 if ((ioflag & IO_VMIO) == 0 && (vfs_ioopt > 1) && object) { 401 int nread, toread; 402 403 toread = uio->uio_resid; 404 if (toread > bytesinfile) 405 toread = bytesinfile; 406 if (toread >= PAGE_SIZE) { 407 /* 408 * Then if it's at least a page in size, try 409 * get the data from the object using vm tricks 410 */ 411 error = uioread(toread, uio, object, &nread); 412 if ((uio->uio_resid == 0) || (error != 0)) { 413 /* 414 * If we finished or there was an error 415 * then finish up (the reference previously 416 * obtained on object must be released). 417 */ 418 if ((error == 0 || 419 uio->uio_resid != orig_resid) && 420 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 421 ip->i_flag |= IN_ACCESS; 422 423 if (object) { 424 vm_object_vndeallocate(object); 425 } 426 return error; 427 } 428 } 429 } 430 #endif 431 432 /* 433 * Ok so we couldn't do it all in one vm trick... 434 * so cycle around trying smaller bites.. 435 */ 436 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 437 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 438 break; 439 #ifdef ENABLE_VFS_IOOPT 440 if ((ioflag & IO_VMIO) == 0 && (vfs_ioopt > 1) && object) { 441 /* 442 * Obviously we didn't finish above, but we 443 * didn't get an error either. Try the same trick again. 444 * but this time we are looping. 445 */ 446 int nread, toread; 447 toread = uio->uio_resid; 448 if (toread > bytesinfile) 449 toread = bytesinfile; 450 451 /* 452 * Once again, if there isn't enough for a 453 * whole page, don't try optimising. 454 */ 455 if (toread >= PAGE_SIZE) { 456 error = uioread(toread, uio, object, &nread); 457 if ((uio->uio_resid == 0) || (error != 0)) { 458 /* 459 * If we finished or there was an 460 * error then finish up (the reference 461 * previously obtained on object must 462 * be released). 463 */ 464 if ((error == 0 || 465 uio->uio_resid != orig_resid) && 466 (vp->v_mount->mnt_flag & 467 MNT_NOATIME) == 0) 468 ip->i_flag |= IN_ACCESS; 469 if (object) { 470 vm_object_vndeallocate(object); 471 } 472 return error; 473 } 474 /* 475 * To get here we didnt't finish or err. 476 * If we did get some data, 477 * loop to try another bite. 478 */ 479 if (nread > 0) { 480 continue; 481 } 482 } 483 } 484 #endif 485 486 lbn = lblkno(fs, uio->uio_offset); 487 nextlbn = lbn + 1; 488 489 /* 490 * size of buffer. The buffer representing the 491 * end of the file is rounded up to the size of 492 * the block type ( fragment or full block, 493 * depending ). 494 */ 495 size = blksize(fs, ip, lbn); 496 blkoffset = blkoff(fs, uio->uio_offset); 497 498 /* 499 * The amount we want to transfer in this iteration is 500 * one FS block less the amount of the data before 501 * our startpoint (duh!) 502 */ 503 xfersize = fs->fs_bsize - blkoffset; 504 505 /* 506 * But if we actually want less than the block, 507 * or the file doesn't have a whole block more of data, 508 * then use the lesser number. 509 */ 510 if (uio->uio_resid < xfersize) 511 xfersize = uio->uio_resid; 512 if (bytesinfile < xfersize) 513 xfersize = bytesinfile; 514 515 if (lblktosize(fs, nextlbn) >= ip->i_size) { 516 /* 517 * Don't do readahead if this is the end of the file. 518 */ 519 error = bread(vp, lbn, size, NOCRED, &bp); 520 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 521 /* 522 * Otherwise if we are allowed to cluster, 523 * grab as much as we can. 524 * 525 * XXX This may not be a win if we are not 526 * doing sequential access. 527 */ 528 error = cluster_read(vp, ip->i_size, lbn, 529 size, NOCRED, uio->uio_resid, seqcount, &bp); 530 } else if (seqcount > 1) { 531 /* 532 * If we are NOT allowed to cluster, then 533 * if we appear to be acting sequentially, 534 * fire off a request for a readahead 535 * as well as a read. Note that the 4th and 5th 536 * arguments point to arrays of the size specified in 537 * the 6th argument. 538 */ 539 int nextsize = blksize(fs, ip, nextlbn); 540 error = breadn(vp, lbn, 541 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 542 } else { 543 /* 544 * Failing all of the above, just read what the 545 * user asked for. Interestingly, the same as 546 * the first option above. 547 */ 548 error = bread(vp, lbn, size, NOCRED, &bp); 549 } 550 if (error) { 551 brelse(bp); 552 bp = NULL; 553 break; 554 } 555 556 /* 557 * If IO_DIRECT then set B_DIRECT for the buffer. This 558 * will cause us to attempt to release the buffer later on 559 * and will cause the buffer cache to attempt to free the 560 * underlying pages. 561 */ 562 if (ioflag & IO_DIRECT) 563 bp->b_flags |= B_DIRECT; 564 565 /* 566 * We should only get non-zero b_resid when an I/O error 567 * has occurred, which should cause us to break above. 568 * However, if the short read did not cause an error, 569 * then we want to ensure that we do not uiomove bad 570 * or uninitialized data. 571 */ 572 size -= bp->b_resid; 573 if (size < xfersize) { 574 if (size == 0) 575 break; 576 xfersize = size; 577 } 578 579 #ifdef ENABLE_VFS_IOOPT 580 if (vfs_ioopt && object && 581 (bp->b_flags & B_VMIO) && 582 ((blkoffset & PAGE_MASK) == 0) && 583 ((xfersize & PAGE_MASK) == 0)) { 584 /* 585 * If VFS IO optimisation is turned on, 586 * and it's an exact page multiple 587 * And a normal VM based op, 588 * then use uiomiveco() 589 */ 590 error = 591 uiomoveco((char *)bp->b_data + blkoffset, 592 (int)xfersize, uio, object, 0); 593 } else 594 #endif 595 { 596 /* 597 * otherwise use the general form 598 */ 599 error = 600 uiomove((char *)bp->b_data + blkoffset, 601 (int)xfersize, uio); 602 } 603 604 if (error) 605 break; 606 607 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 608 (LIST_FIRST(&bp->b_dep) == NULL)) { 609 /* 610 * If there are no dependencies, and it's VMIO, 611 * then we don't need the buf, mark it available 612 * for freeing. The VM has the data. 613 */ 614 bp->b_flags |= B_RELBUF; 615 brelse(bp); 616 } else { 617 /* 618 * Otherwise let whoever 619 * made the request take care of 620 * freeing it. We just queue 621 * it onto another list. 622 */ 623 bqrelse(bp); 624 } 625 } 626 627 /* 628 * This can only happen in the case of an error 629 * because the loop above resets bp to NULL on each iteration 630 * and on normal completion has not set a new value into it. 631 * so it must have come from a 'break' statement 632 */ 633 if (bp != NULL) { 634 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 635 (LIST_FIRST(&bp->b_dep) == NULL)) { 636 bp->b_flags |= B_RELBUF; 637 brelse(bp); 638 } else { 639 bqrelse(bp); 640 } 641 } 642 643 if (object) { 644 vm_object_vndeallocate(object); 645 } 646 if ((error == 0 || uio->uio_resid != orig_resid) && 647 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 648 ip->i_flag |= IN_ACCESS; 649 return (error); 650 } 651 652 /* 653 * Vnode op for writing. 654 */ 655 static int 656 ffs_write(ap) 657 struct vop_write_args /* { 658 struct vnode *a_vp; 659 struct uio *a_uio; 660 int a_ioflag; 661 struct ucred *a_cred; 662 } */ *ap; 663 { 664 struct vnode *vp; 665 struct uio *uio; 666 struct inode *ip; 667 struct fs *fs; 668 struct buf *bp; 669 struct thread *td; 670 ufs_lbn_t lbn; 671 off_t osize; 672 int seqcount; 673 int blkoffset, error, extended, flags, ioflag, resid, size, xfersize; 674 vm_object_t object; 675 676 vp = ap->a_vp; 677 uio = ap->a_uio; 678 ioflag = ap->a_ioflag; 679 if (ap->a_ioflag & IO_EXT) 680 #ifdef notyet 681 return (ffs_extwrite(vp, uio, ioflag, ap->a_cred)); 682 #else 683 panic("ffs_read+IO_EXT"); 684 #endif 685 686 GIANT_REQUIRED; 687 688 extended = 0; 689 seqcount = ap->a_ioflag >> 16; 690 ip = VTOI(vp); 691 692 object = vp->v_object; 693 if (object) { 694 vm_object_reference(object); 695 } 696 697 #ifdef DIAGNOSTIC 698 if (uio->uio_rw != UIO_WRITE) 699 panic("ffswrite: mode"); 700 #endif 701 702 switch (vp->v_type) { 703 case VREG: 704 if (ioflag & IO_APPEND) 705 uio->uio_offset = ip->i_size; 706 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) { 707 if (object) { 708 vm_object_vndeallocate(object); 709 } 710 return (EPERM); 711 } 712 /* FALLTHROUGH */ 713 case VLNK: 714 break; 715 case VDIR: 716 panic("ffswrite: dir write"); 717 break; 718 default: 719 panic("ffswrite: type %p %d (%d,%d)", vp, (int)vp->v_type, 720 (int)uio->uio_offset, 721 (int)uio->uio_resid 722 ); 723 } 724 725 fs = ip->i_fs; 726 if (uio->uio_offset < 0 || 727 (u_int64_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) { 728 if (object) { 729 vm_object_vndeallocate(object); 730 } 731 return (EFBIG); 732 } 733 /* 734 * Maybe this should be above the vnode op call, but so long as 735 * file servers have no limits, I don't think it matters. 736 */ 737 td = uio->uio_td; 738 if (vp->v_type == VREG && td && 739 uio->uio_offset + uio->uio_resid > 740 td->td_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 741 PROC_LOCK(td->td_proc); 742 psignal(td->td_proc, SIGXFSZ); 743 PROC_UNLOCK(td->td_proc); 744 if (object) { 745 vm_object_vndeallocate(object); 746 } 747 return (EFBIG); 748 } 749 750 resid = uio->uio_resid; 751 osize = ip->i_size; 752 if (seqcount > BA_SEQMAX) 753 flags = BA_SEQMAX << BA_SEQSHIFT; 754 else 755 flags = seqcount << BA_SEQSHIFT; 756 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 757 flags |= IO_SYNC; 758 759 #ifdef ENABLE_VFS_IOOPT 760 if (object && (object->flags & OBJ_OPT)) { 761 vm_freeze_copyopts(object, 762 OFF_TO_IDX(uio->uio_offset), 763 OFF_TO_IDX(uio->uio_offset + uio->uio_resid + PAGE_MASK)); 764 } 765 #endif 766 for (error = 0; uio->uio_resid > 0;) { 767 lbn = lblkno(fs, uio->uio_offset); 768 blkoffset = blkoff(fs, uio->uio_offset); 769 xfersize = fs->fs_bsize - blkoffset; 770 if (uio->uio_resid < xfersize) 771 xfersize = uio->uio_resid; 772 773 if (uio->uio_offset + xfersize > ip->i_size) 774 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 775 776 /* 777 * We must perform a read-before-write if the transfer size 778 * does not cover the entire buffer. 779 */ 780 if (fs->fs_bsize > xfersize) 781 flags |= BA_CLRBUF; 782 else 783 flags &= ~BA_CLRBUF; 784 /* XXX is uio->uio_offset the right thing here? */ 785 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 786 ap->a_cred, flags, &bp); 787 if (error != 0) 788 break; 789 /* 790 * If the buffer is not valid we have to clear out any 791 * garbage data from the pages instantiated for the buffer. 792 * If we do not, a failed uiomove() during a write can leave 793 * the prior contents of the pages exposed to a userland 794 * mmap(). XXX deal with uiomove() errors a better way. 795 */ 796 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 797 vfs_bio_clrbuf(bp); 798 if (ioflag & IO_DIRECT) 799 bp->b_flags |= B_DIRECT; 800 if (ioflag & IO_NOWDRAIN) 801 bp->b_flags |= B_NOWDRAIN; 802 803 if (uio->uio_offset + xfersize > ip->i_size) { 804 ip->i_size = uio->uio_offset + xfersize; 805 DIP(ip, i_size) = ip->i_size; 806 extended = 1; 807 } 808 809 size = blksize(fs, ip, lbn) - bp->b_resid; 810 if (size < xfersize) 811 xfersize = size; 812 813 error = 814 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 815 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 816 (LIST_FIRST(&bp->b_dep) == NULL)) { 817 bp->b_flags |= B_RELBUF; 818 } 819 820 /* 821 * If IO_SYNC each buffer is written synchronously. Otherwise 822 * if we have a severe page deficiency write the buffer 823 * asynchronously. Otherwise try to cluster, and if that 824 * doesn't do it then either do an async write (if O_DIRECT), 825 * or a delayed write (if not). 826 */ 827 if (ioflag & IO_SYNC) { 828 (void)bwrite(bp); 829 } else if (vm_page_count_severe() || 830 buf_dirty_count_severe() || 831 (ioflag & IO_ASYNC)) { 832 bp->b_flags |= B_CLUSTEROK; 833 bawrite(bp); 834 } else if (xfersize + blkoffset == fs->fs_bsize) { 835 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 836 bp->b_flags |= B_CLUSTEROK; 837 cluster_write(bp, ip->i_size, seqcount); 838 } else { 839 bawrite(bp); 840 } 841 } else if (ioflag & IO_DIRECT) { 842 bp->b_flags |= B_CLUSTEROK; 843 bawrite(bp); 844 } else { 845 bp->b_flags |= B_CLUSTEROK; 846 bdwrite(bp); 847 } 848 if (error || xfersize == 0) 849 break; 850 ip->i_flag |= IN_CHANGE | IN_UPDATE; 851 } 852 /* 853 * If we successfully wrote any data, and we are not the superuser 854 * we clear the setuid and setgid bits as a precaution against 855 * tampering. 856 */ 857 if (resid > uio->uio_resid && ap->a_cred && 858 suser_cred(ap->a_cred, PRISON_ROOT)) { 859 ip->i_mode &= ~(ISUID | ISGID); 860 DIP(ip, i_mode) = ip->i_mode; 861 } 862 if (resid > uio->uio_resid) 863 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 864 if (error) { 865 if (ioflag & IO_UNIT) { 866 (void)UFS_TRUNCATE(vp, osize, 867 IO_NORMAL | (ioflag & IO_SYNC), 868 ap->a_cred, uio->uio_td); 869 uio->uio_offset -= resid - uio->uio_resid; 870 uio->uio_resid = resid; 871 } 872 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 873 error = UFS_UPDATE(vp, 1); 874 875 if (object) { 876 vm_object_vndeallocate(object); 877 } 878 879 return (error); 880 } 881 882 /* 883 * get page routine 884 */ 885 static int 886 ffs_getpages(ap) 887 struct vop_getpages_args *ap; 888 { 889 off_t foff, physoffset; 890 int i, size, bsize; 891 struct vnode *dp, *vp; 892 vm_object_t obj; 893 vm_pindex_t pindex, firstindex; 894 vm_page_t mreq; 895 int bbackwards, bforwards; 896 int pbackwards, pforwards; 897 int firstpage; 898 ufs2_daddr_t reqblkno, reqlblkno; 899 int poff; 900 int pcount; 901 int rtval; 902 int pagesperblock; 903 904 GIANT_REQUIRED; 905 906 pcount = round_page(ap->a_count) / PAGE_SIZE; 907 mreq = ap->a_m[ap->a_reqpage]; 908 firstindex = ap->a_m[0]->pindex; 909 910 /* 911 * if ANY DEV_BSIZE blocks are valid on a large filesystem block, 912 * then the entire page is valid. Since the page may be mapped, 913 * user programs might reference data beyond the actual end of file 914 * occuring within the page. We have to zero that data. 915 */ 916 if (mreq->valid) { 917 if (mreq->valid != VM_PAGE_BITS_ALL) 918 vm_page_zero_invalid(mreq, TRUE); 919 vm_page_lock_queues(); 920 for (i = 0; i < pcount; i++) { 921 if (i != ap->a_reqpage) { 922 vm_page_free(ap->a_m[i]); 923 } 924 } 925 vm_page_unlock_queues(); 926 return VM_PAGER_OK; 927 } 928 929 vp = ap->a_vp; 930 obj = vp->v_object; 931 bsize = vp->v_mount->mnt_stat.f_iosize; 932 pindex = mreq->pindex; 933 foff = IDX_TO_OFF(pindex) /* + ap->a_offset should be zero */; 934 935 if (bsize < PAGE_SIZE) 936 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 937 ap->a_count, 938 ap->a_reqpage); 939 940 /* 941 * foff is the file offset of the required page 942 * reqlblkno is the logical block that contains the page 943 * poff is the index of the page into the logical block 944 */ 945 reqlblkno = foff / bsize; 946 poff = (foff % bsize) / PAGE_SIZE; 947 948 dp = VTOI(vp)->i_devvp; 949 if (ufs_bmaparray(vp, reqlblkno, &reqblkno, 0, &bforwards, &bbackwards) 950 || (reqblkno == -1)) { 951 vm_page_lock_queues(); 952 for(i = 0; i < pcount; i++) { 953 if (i != ap->a_reqpage) 954 vm_page_free(ap->a_m[i]); 955 } 956 vm_page_unlock_queues(); 957 if (reqblkno == -1) { 958 if ((mreq->flags & PG_ZERO) == 0) 959 pmap_zero_page(mreq); 960 vm_page_undirty(mreq); 961 mreq->valid = VM_PAGE_BITS_ALL; 962 return VM_PAGER_OK; 963 } else { 964 return VM_PAGER_ERROR; 965 } 966 } 967 968 physoffset = (off_t)reqblkno * DEV_BSIZE + poff * PAGE_SIZE; 969 pagesperblock = bsize / PAGE_SIZE; 970 /* 971 * find the first page that is contiguous... 972 * note that pbackwards is the number of pages that are contiguous 973 * backwards. 974 */ 975 firstpage = 0; 976 if (ap->a_count) { 977 pbackwards = poff + bbackwards * pagesperblock; 978 if (ap->a_reqpage > pbackwards) { 979 firstpage = ap->a_reqpage - pbackwards; 980 vm_page_lock_queues(); 981 for(i=0;i<firstpage;i++) 982 vm_page_free(ap->a_m[i]); 983 vm_page_unlock_queues(); 984 } 985 986 /* 987 * pforwards is the number of pages that are contiguous 988 * after the current page. 989 */ 990 pforwards = (pagesperblock - (poff + 1)) + 991 bforwards * pagesperblock; 992 if (pforwards < (pcount - (ap->a_reqpage + 1))) { 993 vm_page_lock_queues(); 994 for( i = ap->a_reqpage + pforwards + 1; i < pcount; i++) 995 vm_page_free(ap->a_m[i]); 996 vm_page_unlock_queues(); 997 pcount = ap->a_reqpage + pforwards + 1; 998 } 999 1000 /* 1001 * number of pages for I/O corrected for the non-contig pages at 1002 * the beginning of the array. 1003 */ 1004 pcount -= firstpage; 1005 } 1006 1007 /* 1008 * calculate the size of the transfer 1009 */ 1010 1011 size = pcount * PAGE_SIZE; 1012 1013 if ((IDX_TO_OFF(ap->a_m[firstpage]->pindex) + size) > 1014 obj->un_pager.vnp.vnp_size) 1015 size = obj->un_pager.vnp.vnp_size - 1016 IDX_TO_OFF(ap->a_m[firstpage]->pindex); 1017 1018 physoffset -= foff; 1019 rtval = VOP_GETPAGES(dp, &ap->a_m[firstpage], size, 1020 (ap->a_reqpage - firstpage), physoffset); 1021 1022 return (rtval); 1023 } 1024 1025 /* 1026 * Extended attribute area reading. 1027 */ 1028 static int 1029 ffs_extread(struct vnode *vp, struct uio *uio, int ioflag) 1030 { 1031 struct inode *ip; 1032 struct ufs2_dinode *dp; 1033 struct fs *fs; 1034 struct buf *bp; 1035 ufs_lbn_t lbn, nextlbn; 1036 off_t bytesinfile; 1037 long size, xfersize, blkoffset; 1038 int error, orig_resid; 1039 mode_t mode; 1040 1041 GIANT_REQUIRED; 1042 1043 ip = VTOI(vp); 1044 fs = ip->i_fs; 1045 dp = ip->i_din2; 1046 mode = ip->i_mode; 1047 1048 #ifdef DIAGNOSTIC 1049 if (uio->uio_rw != UIO_READ || fs->fs_magic != FS_UFS2_MAGIC) 1050 panic("ffs_extread: mode"); 1051 1052 #endif 1053 orig_resid = uio->uio_resid; 1054 if (orig_resid <= 0) 1055 return (0); 1056 1057 bytesinfile = dp->di_extsize - uio->uio_offset; 1058 if (bytesinfile <= 0) { 1059 if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1060 ip->i_flag |= IN_ACCESS; 1061 return 0; 1062 } 1063 1064 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1065 if ((bytesinfile = dp->di_extsize - uio->uio_offset) <= 0) 1066 break; 1067 1068 lbn = lblkno(fs, uio->uio_offset); 1069 nextlbn = lbn + 1; 1070 1071 /* 1072 * size of buffer. The buffer representing the 1073 * end of the file is rounded up to the size of 1074 * the block type ( fragment or full block, 1075 * depending ). 1076 */ 1077 size = sblksize(fs, dp->di_extsize, lbn); 1078 blkoffset = blkoff(fs, uio->uio_offset); 1079 1080 /* 1081 * The amount we want to transfer in this iteration is 1082 * one FS block less the amount of the data before 1083 * our startpoint (duh!) 1084 */ 1085 xfersize = fs->fs_bsize - blkoffset; 1086 1087 /* 1088 * But if we actually want less than the block, 1089 * or the file doesn't have a whole block more of data, 1090 * then use the lesser number. 1091 */ 1092 if (uio->uio_resid < xfersize) 1093 xfersize = uio->uio_resid; 1094 if (bytesinfile < xfersize) 1095 xfersize = bytesinfile; 1096 1097 if (lblktosize(fs, nextlbn) >= dp->di_extsize) { 1098 /* 1099 * Don't do readahead if this is the end of the info. 1100 */ 1101 error = bread(vp, -1 - lbn, size, NOCRED, &bp); 1102 } else { 1103 /* 1104 * If we have a second block, then 1105 * fire off a request for a readahead 1106 * as well as a read. Note that the 4th and 5th 1107 * arguments point to arrays of the size specified in 1108 * the 6th argument. 1109 */ 1110 int nextsize = sblksize(fs, dp->di_extsize, nextlbn); 1111 1112 nextlbn = -1 - nextlbn; 1113 error = breadn(vp, -1 - lbn, 1114 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1115 } 1116 if (error) { 1117 brelse(bp); 1118 bp = NULL; 1119 break; 1120 } 1121 1122 /* 1123 * If IO_DIRECT then set B_DIRECT for the buffer. This 1124 * will cause us to attempt to release the buffer later on 1125 * and will cause the buffer cache to attempt to free the 1126 * underlying pages. 1127 */ 1128 if (ioflag & IO_DIRECT) 1129 bp->b_flags |= B_DIRECT; 1130 1131 /* 1132 * We should only get non-zero b_resid when an I/O error 1133 * has occurred, which should cause us to break above. 1134 * However, if the short read did not cause an error, 1135 * then we want to ensure that we do not uiomove bad 1136 * or uninitialized data. 1137 */ 1138 size -= bp->b_resid; 1139 if (size < xfersize) { 1140 if (size == 0) 1141 break; 1142 xfersize = size; 1143 } 1144 1145 error = uiomove((char *)bp->b_data + blkoffset, 1146 (int)xfersize, uio); 1147 if (error) 1148 break; 1149 1150 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 1151 (LIST_FIRST(&bp->b_dep) == NULL)) { 1152 /* 1153 * If there are no dependencies, and it's VMIO, 1154 * then we don't need the buf, mark it available 1155 * for freeing. The VM has the data. 1156 */ 1157 bp->b_flags |= B_RELBUF; 1158 brelse(bp); 1159 } else { 1160 /* 1161 * Otherwise let whoever 1162 * made the request take care of 1163 * freeing it. We just queue 1164 * it onto another list. 1165 */ 1166 bqrelse(bp); 1167 } 1168 } 1169 1170 /* 1171 * This can only happen in the case of an error 1172 * because the loop above resets bp to NULL on each iteration 1173 * and on normal completion has not set a new value into it. 1174 * so it must have come from a 'break' statement 1175 */ 1176 if (bp != NULL) { 1177 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 1178 (LIST_FIRST(&bp->b_dep) == NULL)) { 1179 bp->b_flags |= B_RELBUF; 1180 brelse(bp); 1181 } else { 1182 bqrelse(bp); 1183 } 1184 } 1185 1186 if ((error == 0 || uio->uio_resid != orig_resid) && 1187 (vp->v_mount->mnt_flag & MNT_NOATIME) == 0) 1188 ip->i_flag |= IN_ACCESS; 1189 return (error); 1190 } 1191 1192 /* 1193 * Extended attribute area writing. 1194 */ 1195 static int 1196 ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred) 1197 { 1198 struct inode *ip; 1199 struct ufs2_dinode *dp; 1200 struct fs *fs; 1201 struct buf *bp; 1202 ufs_lbn_t lbn; 1203 off_t osize; 1204 int blkoffset, error, flags, resid, size, xfersize; 1205 1206 GIANT_REQUIRED; 1207 1208 ip = VTOI(vp); 1209 fs = ip->i_fs; 1210 dp = ip->i_din2; 1211 1212 #ifdef DIAGNOSTIC 1213 if (uio->uio_rw != UIO_WRITE || fs->fs_magic != FS_UFS2_MAGIC) 1214 panic("ext_write: mode"); 1215 #endif 1216 1217 if (ioflag & IO_APPEND) 1218 uio->uio_offset = dp->di_extsize; 1219 1220 if (uio->uio_offset < 0 || 1221 (u_int64_t)uio->uio_offset + uio->uio_resid > NXADDR * fs->fs_bsize) 1222 return (EFBIG); 1223 1224 resid = uio->uio_resid; 1225 osize = dp->di_extsize; 1226 flags = IO_EXT; 1227 if ((ioflag & IO_SYNC) && !DOINGASYNC(vp)) 1228 flags |= IO_SYNC; 1229 1230 for (error = 0; uio->uio_resid > 0;) { 1231 lbn = lblkno(fs, uio->uio_offset); 1232 blkoffset = blkoff(fs, uio->uio_offset); 1233 xfersize = fs->fs_bsize - blkoffset; 1234 if (uio->uio_resid < xfersize) 1235 xfersize = uio->uio_resid; 1236 1237 /* 1238 * We must perform a read-before-write if the transfer size 1239 * does not cover the entire buffer. 1240 */ 1241 if (fs->fs_bsize > xfersize) 1242 flags |= BA_CLRBUF; 1243 else 1244 flags &= ~BA_CLRBUF; 1245 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 1246 ucred, flags, &bp); 1247 if (error != 0) 1248 break; 1249 /* 1250 * If the buffer is not valid we have to clear out any 1251 * garbage data from the pages instantiated for the buffer. 1252 * If we do not, a failed uiomove() during a write can leave 1253 * the prior contents of the pages exposed to a userland 1254 * mmap(). XXX deal with uiomove() errors a better way. 1255 */ 1256 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 1257 vfs_bio_clrbuf(bp); 1258 if (ioflag & IO_DIRECT) 1259 bp->b_flags |= B_DIRECT; 1260 if (ioflag & IO_NOWDRAIN) 1261 bp->b_flags |= B_NOWDRAIN; 1262 1263 if (uio->uio_offset + xfersize > dp->di_extsize) 1264 dp->di_extsize = uio->uio_offset + xfersize; 1265 1266 size = sblksize(fs, dp->di_extsize, lbn) - bp->b_resid; 1267 if (size < xfersize) 1268 xfersize = size; 1269 1270 error = 1271 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1272 if ((ioflag & (IO_VMIO|IO_DIRECT)) && 1273 (LIST_FIRST(&bp->b_dep) == NULL)) { 1274 bp->b_flags |= B_RELBUF; 1275 } 1276 1277 /* 1278 * If IO_SYNC each buffer is written synchronously. Otherwise 1279 * if we have a severe page deficiency write the buffer 1280 * asynchronously. Otherwise try to cluster, and if that 1281 * doesn't do it then either do an async write (if O_DIRECT), 1282 * or a delayed write (if not). 1283 */ 1284 if (ioflag & IO_SYNC) { 1285 (void)bwrite(bp); 1286 } else if (vm_page_count_severe() || 1287 buf_dirty_count_severe() || 1288 xfersize + blkoffset == fs->fs_bsize || 1289 (ioflag & (IO_ASYNC | IO_DIRECT))) 1290 bawrite(bp); 1291 else 1292 bdwrite(bp); 1293 if (error || xfersize == 0) 1294 break; 1295 ip->i_flag |= IN_CHANGE | IN_UPDATE; 1296 } 1297 /* 1298 * If we successfully wrote any data, and we are not the superuser 1299 * we clear the setuid and setgid bits as a precaution against 1300 * tampering. 1301 */ 1302 if (resid > uio->uio_resid && ucred && 1303 suser_cred(ucred, PRISON_ROOT)) { 1304 ip->i_mode &= ~(ISUID | ISGID); 1305 dp->di_mode = ip->i_mode; 1306 } 1307 if (error) { 1308 if (ioflag & IO_UNIT) { 1309 (void)UFS_TRUNCATE(vp, osize, 1310 IO_EXT | (ioflag&IO_SYNC), ucred, uio->uio_td); 1311 uio->uio_offset -= resid - uio->uio_resid; 1312 uio->uio_resid = resid; 1313 } 1314 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 1315 error = UFS_UPDATE(vp, 1); 1316 return (error); 1317 } 1318 1319 1320 /* 1321 * Vnode operating to retrieve a named extended attribute. 1322 * 1323 * Locate a particular EA (nspace:name) in the area (ptr:length), and return 1324 * the length of the EA, and possibly the pointer to the entry and to the data. 1325 */ 1326 static int 1327 ffs_findextattr(u_char *ptr, uint length, int nspace, const char *name, u_char **eap, u_char **eac) 1328 { 1329 u_char *p, *pe, *pn, *p0; 1330 int eapad1, eapad2, ealength, ealen, nlen; 1331 uint32_t ul; 1332 1333 pe = ptr + length; 1334 nlen = strlen(name); 1335 1336 for (p = ptr; p < pe; p = pn) { 1337 p0 = p; 1338 bcopy(p, &ul, sizeof(ul)); 1339 pn = p + ul; 1340 /* make sure this entry is complete */ 1341 if (pn > pe) 1342 break; 1343 p += sizeof(uint32_t); 1344 if (*p != nspace) 1345 continue; 1346 p++; 1347 eapad2 = *p++; 1348 if (*p != nlen) 1349 continue; 1350 p++; 1351 if (bcmp(p, name, nlen)) 1352 continue; 1353 ealength = sizeof(uint32_t) + 3 + nlen; 1354 eapad1 = 8 - (ealength % 8); 1355 if (eapad1 == 8) 1356 eapad1 = 0; 1357 ealength += eapad1; 1358 ealen = ul - ealength - eapad2; 1359 p += nlen + eapad1; 1360 if (eap != NULL) 1361 *eap = p0; 1362 if (eac != NULL) 1363 *eac = p; 1364 return (ealen); 1365 } 1366 return(-1); 1367 } 1368 1369 static int 1370 ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td, int extra) 1371 { 1372 struct inode *ip; 1373 struct fs *fs; 1374 struct ufs2_dinode *dp; 1375 struct uio luio; 1376 struct iovec liovec; 1377 int easize, error; 1378 u_char *eae; 1379 1380 ip = VTOI(vp); 1381 fs = ip->i_fs; 1382 dp = ip->i_din2; 1383 easize = dp->di_extsize; 1384 1385 eae = malloc(easize + extra, M_TEMP, M_WAITOK); 1386 1387 liovec.iov_base = eae; 1388 liovec.iov_len = easize; 1389 luio.uio_iov = &liovec; 1390 luio.uio_iovcnt = 1; 1391 luio.uio_offset = 0; 1392 luio.uio_resid = easize; 1393 luio.uio_segflg = UIO_SYSSPACE; 1394 luio.uio_rw = UIO_READ; 1395 luio.uio_td = td; 1396 1397 error = ffs_extread(vp, &luio, IO_EXT | IO_SYNC); 1398 if (error) { 1399 free(eae, M_TEMP); 1400 return(error); 1401 } 1402 *p = eae; 1403 return (0); 1404 } 1405 1406 static int 1407 ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td) 1408 { 1409 struct inode *ip; 1410 struct fs *fs; 1411 struct ufs2_dinode *dp; 1412 int error; 1413 1414 ip = VTOI(vp); 1415 fs = ip->i_fs; 1416 1417 if (ip->i_ea_area != NULL) 1418 return (EBUSY); 1419 dp = ip->i_din2; 1420 error = ffs_rdextattr(&ip->i_ea_area, vp, td, 0); 1421 if (error) 1422 return (error); 1423 ip->i_ea_len = dp->di_extsize; 1424 ip->i_ea_error = 0; 1425 return (0); 1426 } 1427 1428 /* 1429 * Vnode extattr transaction commit/abort 1430 */ 1431 static int 1432 ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td) 1433 { 1434 struct inode *ip; 1435 struct fs *fs; 1436 struct uio luio; 1437 struct iovec liovec; 1438 int error; 1439 struct ufs2_dinode *dp; 1440 1441 ip = VTOI(vp); 1442 fs = ip->i_fs; 1443 if (ip->i_ea_area == NULL) 1444 return (EINVAL); 1445 dp = ip->i_din2; 1446 error = ip->i_ea_error; 1447 if (commit && error == 0) { 1448 if (cred == NOCRED) 1449 cred = vp->v_mount->mnt_cred; 1450 liovec.iov_base = ip->i_ea_area; 1451 liovec.iov_len = ip->i_ea_len; 1452 luio.uio_iov = &liovec; 1453 luio.uio_iovcnt = 1; 1454 luio.uio_offset = 0; 1455 luio.uio_resid = ip->i_ea_len; 1456 luio.uio_segflg = UIO_SYSSPACE; 1457 luio.uio_rw = UIO_WRITE; 1458 luio.uio_td = td; 1459 /* XXX: I'm not happy about truncating to zero size */ 1460 if (ip->i_ea_len < dp->di_extsize) 1461 error = ffs_truncate(vp, 0, IO_EXT, cred, td); 1462 error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred); 1463 } 1464 free(ip->i_ea_area, M_TEMP); 1465 ip->i_ea_area = NULL; 1466 ip->i_ea_len = 0; 1467 ip->i_ea_error = 0; 1468 return (error); 1469 } 1470 1471 /* 1472 * Vnode extattr strategy routine for special devices and fifos. 1473 * 1474 * We need to check for a read or write of the external attributes. 1475 * Otherwise we just fall through and do the usual thing. 1476 */ 1477 static int 1478 ffsext_strategy(struct vop_strategy_args *ap) 1479 /* 1480 struct vop_strategy_args { 1481 struct vnodeop_desc *a_desc; 1482 struct vnode *a_vp; 1483 struct buf *a_bp; 1484 }; 1485 */ 1486 { 1487 struct vnode *vp; 1488 daddr_t lbn; 1489 1490 vp = ap->a_vp; 1491 lbn = ap->a_bp->b_lblkno; 1492 if (VTOI(vp)->i_fs->fs_magic == FS_UFS2_MAGIC && 1493 lbn < 0 && lbn >= -NXADDR) 1494 return (ufs_vnoperate((struct vop_generic_args *)ap)); 1495 if (vp->v_type == VFIFO) 1496 return (ufs_vnoperatefifo((struct vop_generic_args *)ap)); 1497 return (ufs_vnoperatespec((struct vop_generic_args *)ap)); 1498 } 1499 1500 /* 1501 * Vnode extattr transaction commit/abort 1502 */ 1503 static int 1504 ffs_openextattr(struct vop_openextattr_args *ap) 1505 /* 1506 struct vop_openextattr_args { 1507 struct vnodeop_desc *a_desc; 1508 struct vnode *a_vp; 1509 IN struct ucred *a_cred; 1510 IN struct thread *a_td; 1511 }; 1512 */ 1513 { 1514 struct inode *ip; 1515 struct fs *fs; 1516 1517 ip = VTOI(ap->a_vp); 1518 fs = ip->i_fs; 1519 if (fs->fs_magic == FS_UFS1_MAGIC) 1520 return (ufs_vnoperate((struct vop_generic_args *)ap)); 1521 return (ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td)); 1522 } 1523 1524 1525 /* 1526 * Vnode extattr transaction commit/abort 1527 */ 1528 static int 1529 ffs_closeextattr(struct vop_closeextattr_args *ap) 1530 /* 1531 struct vop_closeextattr_args { 1532 struct vnodeop_desc *a_desc; 1533 struct vnode *a_vp; 1534 int a_commit; 1535 IN struct ucred *a_cred; 1536 IN struct thread *a_td; 1537 }; 1538 */ 1539 { 1540 struct inode *ip; 1541 struct fs *fs; 1542 1543 ip = VTOI(ap->a_vp); 1544 fs = ip->i_fs; 1545 if (fs->fs_magic == FS_UFS1_MAGIC) 1546 return (ufs_vnoperate((struct vop_generic_args *)ap)); 1547 return (ffs_close_ea(ap->a_vp, ap->a_commit, ap->a_cred, ap->a_td)); 1548 } 1549 1550 1551 1552 /* 1553 * Vnode operation to retrieve a named extended attribute. 1554 */ 1555 static int 1556 ffs_getextattr(struct vop_getextattr_args *ap) 1557 /* 1558 vop_getextattr { 1559 IN struct vnode *a_vp; 1560 IN int a_attrnamespace; 1561 IN const char *a_name; 1562 INOUT struct uio *a_uio; 1563 OUT size_t *a_size; 1564 IN struct ucred *a_cred; 1565 IN struct thread *a_td; 1566 }; 1567 */ 1568 { 1569 struct inode *ip; 1570 struct fs *fs; 1571 u_char *eae, *p, *pe, *pn; 1572 struct ufs2_dinode *dp; 1573 unsigned easize; 1574 uint32_t ul; 1575 int error, ealen, stand_alone; 1576 1577 ip = VTOI(ap->a_vp); 1578 fs = ip->i_fs; 1579 1580 if (fs->fs_magic == FS_UFS1_MAGIC) 1581 return (ufs_vnoperate((struct vop_generic_args *)ap)); 1582 1583 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1584 ap->a_cred, ap->a_td, IREAD); 1585 if (error) 1586 return (error); 1587 1588 if (ip->i_ea_area == NULL) { 1589 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1590 if (error) 1591 return (error); 1592 stand_alone = 1; 1593 } else { 1594 stand_alone = 0; 1595 } 1596 dp = ip->i_din2; 1597 eae = ip->i_ea_area; 1598 easize = ip->i_ea_len; 1599 if (strlen(ap->a_name) > 0) { 1600 ealen = ffs_findextattr(eae, easize, 1601 ap->a_attrnamespace, ap->a_name, NULL, &p); 1602 if (ealen >= 0) { 1603 error = 0; 1604 if (ap->a_size != NULL) 1605 *ap->a_size = ealen; 1606 else if (ap->a_uio != NULL) 1607 error = uiomove(p, ealen, ap->a_uio); 1608 } else { 1609 error = ENOATTR; 1610 } 1611 } else { 1612 error = 0; 1613 if (ap->a_size != NULL) 1614 *ap->a_size = 0; 1615 pe = eae + easize; 1616 for(p = eae; error == 0 && p < pe; p = pn) { 1617 bcopy(p, &ul, sizeof(ul)); 1618 pn = p + ul; 1619 if (pn > pe) 1620 break; 1621 p += sizeof(ul); 1622 if (*p++ != ap->a_attrnamespace) 1623 continue; 1624 p++; /* pad2 */ 1625 ealen = *p; 1626 if (ap->a_size != NULL) { 1627 *ap->a_size += ealen + 1; 1628 } else if (ap->a_uio != NULL) { 1629 error = uiomove(p, ealen + 1, ap->a_uio); 1630 } 1631 } 1632 } 1633 if (stand_alone) 1634 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1635 return(error); 1636 } 1637 1638 /* 1639 * Vnode operation to set a named attribute. 1640 */ 1641 static int 1642 ffs_setextattr(struct vop_setextattr_args *ap) 1643 /* 1644 vop_setextattr { 1645 IN struct vnode *a_vp; 1646 IN int a_attrnamespace; 1647 IN const char *a_name; 1648 INOUT struct uio *a_uio; 1649 IN struct ucred *a_cred; 1650 IN struct thread *a_td; 1651 }; 1652 */ 1653 { 1654 struct inode *ip; 1655 struct fs *fs; 1656 uint32_t ealength, ul; 1657 int ealen, olen, eacont, eapad1, eapad2, error, i, easize; 1658 u_char *eae, *p; 1659 struct ufs2_dinode *dp; 1660 struct ucred *cred; 1661 int stand_alone; 1662 1663 ip = VTOI(ap->a_vp); 1664 fs = ip->i_fs; 1665 1666 if (fs->fs_magic == FS_UFS1_MAGIC) 1667 return (ufs_vnoperate((struct vop_generic_args *)ap)); 1668 1669 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1670 ap->a_cred, ap->a_td, IWRITE); 1671 if (error) { 1672 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1673 ip->i_ea_error = error; 1674 return (error); 1675 } 1676 1677 if (ap->a_cred != NOCRED) 1678 cred = ap->a_cred; 1679 else 1680 cred = ap->a_vp->v_mount->mnt_cred; 1681 1682 dp = ip->i_din2; 1683 1684 if (ip->i_ea_area == NULL) { 1685 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1686 if (error) 1687 return (error); 1688 stand_alone = 1; 1689 } else { 1690 stand_alone = 0; 1691 } 1692 1693 /* Calculate the length of the EA entry */ 1694 if (ap->a_uio == NULL) { 1695 /* delete */ 1696 ealength = eapad1 = ealen = eapad2 = eacont = 0; 1697 } else { 1698 ealen = ap->a_uio->uio_resid; 1699 ealength = sizeof(uint32_t) + 3 + strlen(ap->a_name); 1700 eapad1 = 8 - (ealength % 8); 1701 if (eapad1 == 8) 1702 eapad1 = 0; 1703 eacont = ealength + eapad1; 1704 eapad2 = 8 - (ealen % 8); 1705 if (eapad2 == 8) 1706 eapad2 = 0; 1707 ealength += eapad1 + ealen + eapad2; 1708 } 1709 1710 eae = malloc(ip->i_ea_len + ealength, M_TEMP, M_WAITOK); 1711 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1712 easize = ip->i_ea_len; 1713 1714 olen = ffs_findextattr(eae, easize, 1715 ap->a_attrnamespace, ap->a_name, &p, NULL); 1716 if (olen == -1 && ealength == 0) { 1717 /* delete but nonexistent */ 1718 free(eae, M_TEMP); 1719 if (stand_alone) 1720 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1721 return(ENOATTR); 1722 } 1723 if (olen == -1) { 1724 /* new, append at end */ 1725 p = eae + easize; 1726 easize += ealength; 1727 } else { 1728 bcopy(p, &ul, sizeof ul); 1729 i = p - eae + ul; 1730 if (ul != ealength) { 1731 bcopy(p + ul, p + ealength, easize - i); 1732 easize += (ealength - ul); 1733 } 1734 } 1735 if (easize > NXADDR * fs->fs_bsize) { 1736 free(eae, M_TEMP); 1737 if (stand_alone) 1738 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1739 else if (ip->i_ea_error == 0) 1740 ip->i_ea_error = ENOSPC; 1741 return(ENOSPC); 1742 } 1743 if (ealength != 0) { 1744 bcopy(&ealength, p, sizeof(ealength)); 1745 p += sizeof(ealength); 1746 *p++ = ap->a_attrnamespace; 1747 *p++ = eapad2; 1748 *p++ = strlen(ap->a_name); 1749 strcpy(p, ap->a_name); 1750 p += strlen(ap->a_name); 1751 bzero(p, eapad1); 1752 p += eapad1; 1753 error = uiomove(p, ealen, ap->a_uio); 1754 if (error) { 1755 free(eae, M_TEMP); 1756 if (stand_alone) 1757 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1758 else if (ip->i_ea_error == 0) 1759 ip->i_ea_error = error; 1760 return(error); 1761 } 1762 p += ealen; 1763 bzero(p, eapad2); 1764 } 1765 p = ip->i_ea_area; 1766 ip->i_ea_area = eae; 1767 ip->i_ea_len = easize; 1768 free(p, M_TEMP); 1769 if (stand_alone) 1770 error = ffs_close_ea(ap->a_vp, 1, ap->a_cred, ap->a_td); 1771 return(error); 1772 }
Cache object: b6615c3799c8653d66b2e81cf6f0d94d
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