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sys/ufs/ffs/ffs_vnops.c
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1 /*- 2 * SPDX-License-Identifier: (BSD-2-Clause-FreeBSD AND BSD-3-Clause) 3 * 4 * Copyright (c) 2002, 2003 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project by Marshall 8 * Kirk McKusick and Network Associates Laboratories, the Security 9 * Research Division of Network Associates, Inc. under DARPA/SPAWAR 10 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS 11 * research program 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * Copyright (c) 1982, 1986, 1989, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * from: @(#)ufs_readwrite.c 8.11 (Berkeley) 5/8/95 62 * from: $FreeBSD: .../ufs/ufs_readwrite.c,v 1.96 2002/08/12 09:22:11 phk ... 63 * @(#)ffs_vnops.c 8.15 (Berkeley) 5/14/95 64 */ 65 66 #include <sys/cdefs.h> 67 __FBSDID("$FreeBSD$"); 68 69 #include "opt_directio.h" 70 #include "opt_ffs.h" 71 #include "opt_ufs.h" 72 73 #include <sys/param.h> 74 #include <sys/bio.h> 75 #include <sys/systm.h> 76 #include <sys/buf.h> 77 #include <sys/conf.h> 78 #include <sys/extattr.h> 79 #include <sys/kernel.h> 80 #include <sys/limits.h> 81 #include <sys/malloc.h> 82 #include <sys/mount.h> 83 #include <sys/priv.h> 84 #include <sys/rwlock.h> 85 #include <sys/stat.h> 86 #include <sys/sysctl.h> 87 #include <sys/vmmeter.h> 88 #include <sys/vnode.h> 89 90 #include <vm/vm.h> 91 #include <vm/vm_param.h> 92 #include <vm/vm_extern.h> 93 #include <vm/vm_object.h> 94 #include <vm/vm_page.h> 95 #include <vm/vm_pager.h> 96 #include <vm/vnode_pager.h> 97 98 #include <ufs/ufs/extattr.h> 99 #include <ufs/ufs/quota.h> 100 #include <ufs/ufs/inode.h> 101 #include <ufs/ufs/ufs_extern.h> 102 #include <ufs/ufs/ufsmount.h> 103 #include <ufs/ufs/dir.h> 104 #ifdef UFS_DIRHASH 105 #include <ufs/ufs/dirhash.h> 106 #endif 107 108 #include <ufs/ffs/fs.h> 109 #include <ufs/ffs/ffs_extern.h> 110 111 #define ALIGNED_TO(ptr, s) \ 112 (((uintptr_t)(ptr) & (_Alignof(s) - 1)) == 0) 113 114 #ifdef DIRECTIO 115 extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone); 116 #endif 117 static vop_fdatasync_t ffs_fdatasync; 118 static vop_fsync_t ffs_fsync; 119 static vop_getpages_t ffs_getpages; 120 static vop_getpages_async_t ffs_getpages_async; 121 static vop_lock1_t ffs_lock; 122 #ifdef INVARIANTS 123 static vop_unlock_t ffs_unlock_debug; 124 #endif 125 static vop_read_t ffs_read; 126 static vop_write_t ffs_write; 127 static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag); 128 static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, 129 struct ucred *cred); 130 static vop_strategy_t ffsext_strategy; 131 static vop_closeextattr_t ffs_closeextattr; 132 static vop_deleteextattr_t ffs_deleteextattr; 133 static vop_getextattr_t ffs_getextattr; 134 static vop_listextattr_t ffs_listextattr; 135 static vop_openextattr_t ffs_openextattr; 136 static vop_setextattr_t ffs_setextattr; 137 static vop_vptofh_t ffs_vptofh; 138 static vop_vput_pair_t ffs_vput_pair; 139 140 /* Global vfs data structures for ufs. */ 141 struct vop_vector ffs_vnodeops1 = { 142 .vop_default = &ufs_vnodeops, 143 .vop_fsync = ffs_fsync, 144 .vop_fdatasync = ffs_fdatasync, 145 .vop_getpages = ffs_getpages, 146 .vop_getpages_async = ffs_getpages_async, 147 .vop_lock1 = ffs_lock, 148 #ifdef INVARIANTS 149 .vop_unlock = ffs_unlock_debug, 150 #endif 151 .vop_read = ffs_read, 152 .vop_reallocblks = ffs_reallocblks, 153 .vop_write = ffs_write, 154 .vop_vptofh = ffs_vptofh, 155 .vop_vput_pair = ffs_vput_pair, 156 }; 157 VFS_VOP_VECTOR_REGISTER(ffs_vnodeops1); 158 159 struct vop_vector ffs_fifoops1 = { 160 .vop_default = &ufs_fifoops, 161 .vop_fsync = ffs_fsync, 162 .vop_fdatasync = ffs_fdatasync, 163 .vop_lock1 = ffs_lock, 164 #ifdef INVARIANTS 165 .vop_unlock = ffs_unlock_debug, 166 #endif 167 .vop_vptofh = ffs_vptofh, 168 }; 169 VFS_VOP_VECTOR_REGISTER(ffs_fifoops1); 170 171 /* Global vfs data structures for ufs. */ 172 struct vop_vector ffs_vnodeops2 = { 173 .vop_default = &ufs_vnodeops, 174 .vop_fsync = ffs_fsync, 175 .vop_fdatasync = ffs_fdatasync, 176 .vop_getpages = ffs_getpages, 177 .vop_getpages_async = ffs_getpages_async, 178 .vop_lock1 = ffs_lock, 179 #ifdef INVARIANTS 180 .vop_unlock = ffs_unlock_debug, 181 #endif 182 .vop_read = ffs_read, 183 .vop_reallocblks = ffs_reallocblks, 184 .vop_write = ffs_write, 185 .vop_closeextattr = ffs_closeextattr, 186 .vop_deleteextattr = ffs_deleteextattr, 187 .vop_getextattr = ffs_getextattr, 188 .vop_listextattr = ffs_listextattr, 189 .vop_openextattr = ffs_openextattr, 190 .vop_setextattr = ffs_setextattr, 191 .vop_vptofh = ffs_vptofh, 192 .vop_vput_pair = ffs_vput_pair, 193 }; 194 VFS_VOP_VECTOR_REGISTER(ffs_vnodeops2); 195 196 struct vop_vector ffs_fifoops2 = { 197 .vop_default = &ufs_fifoops, 198 .vop_fsync = ffs_fsync, 199 .vop_fdatasync = ffs_fdatasync, 200 .vop_lock1 = ffs_lock, 201 #ifdef INVARIANTS 202 .vop_unlock = ffs_unlock_debug, 203 #endif 204 .vop_reallocblks = ffs_reallocblks, 205 .vop_strategy = ffsext_strategy, 206 .vop_closeextattr = ffs_closeextattr, 207 .vop_deleteextattr = ffs_deleteextattr, 208 .vop_getextattr = ffs_getextattr, 209 .vop_listextattr = ffs_listextattr, 210 .vop_openextattr = ffs_openextattr, 211 .vop_setextattr = ffs_setextattr, 212 .vop_vptofh = ffs_vptofh, 213 }; 214 VFS_VOP_VECTOR_REGISTER(ffs_fifoops2); 215 216 /* 217 * Synch an open file. 218 */ 219 /* ARGSUSED */ 220 static int 221 ffs_fsync(struct vop_fsync_args *ap) 222 { 223 struct vnode *vp; 224 struct bufobj *bo; 225 int error; 226 227 vp = ap->a_vp; 228 bo = &vp->v_bufobj; 229 retry: 230 error = ffs_syncvnode(vp, ap->a_waitfor, 0); 231 if (error) 232 return (error); 233 if (ap->a_waitfor == MNT_WAIT && DOINGSOFTDEP(vp)) { 234 error = softdep_fsync(vp); 235 if (error) 236 return (error); 237 238 /* 239 * The softdep_fsync() function may drop vp lock, 240 * allowing for dirty buffers to reappear on the 241 * bo_dirty list. Recheck and resync as needed. 242 */ 243 BO_LOCK(bo); 244 if ((vp->v_type == VREG || vp->v_type == VDIR) && 245 (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0)) { 246 BO_UNLOCK(bo); 247 goto retry; 248 } 249 BO_UNLOCK(bo); 250 } 251 if (ffs_fsfail_cleanup(VFSTOUFS(vp->v_mount), 0)) 252 return (ENXIO); 253 return (0); 254 } 255 256 int 257 ffs_syncvnode(struct vnode *vp, int waitfor, int flags) 258 { 259 struct inode *ip; 260 struct bufobj *bo; 261 struct ufsmount *ump; 262 struct buf *bp, *nbp; 263 ufs_lbn_t lbn; 264 int error, passes, wflag; 265 bool still_dirty, unlocked, wait; 266 267 ip = VTOI(vp); 268 bo = &vp->v_bufobj; 269 ump = VFSTOUFS(vp->v_mount); 270 #ifdef WITNESS 271 wflag = IS_SNAPSHOT(ip) ? LK_NOWITNESS : 0; 272 #else 273 wflag = 0; 274 #endif 275 276 /* 277 * When doing MNT_WAIT we must first flush all dependencies 278 * on the inode. 279 */ 280 if (DOINGSOFTDEP(vp) && waitfor == MNT_WAIT && 281 (error = softdep_sync_metadata(vp)) != 0) { 282 if (ffs_fsfail_cleanup(ump, error)) 283 error = 0; 284 return (error); 285 } 286 287 /* 288 * Flush all dirty buffers associated with a vnode. 289 */ 290 error = 0; 291 passes = 0; 292 wait = false; /* Always do an async pass first. */ 293 unlocked = false; 294 lbn = lblkno(ITOFS(ip), (ip->i_size + ITOFS(ip)->fs_bsize - 1)); 295 BO_LOCK(bo); 296 loop: 297 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 298 bp->b_vflags &= ~BV_SCANNED; 299 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 300 /* 301 * Reasons to skip this buffer: it has already been considered 302 * on this pass, the buffer has dependencies that will cause 303 * it to be redirtied and it has not already been deferred, 304 * or it is already being written. 305 */ 306 if ((bp->b_vflags & BV_SCANNED) != 0) 307 continue; 308 bp->b_vflags |= BV_SCANNED; 309 /* 310 * Flush indirects in order, if requested. 311 * 312 * Note that if only datasync is requested, we can 313 * skip indirect blocks when softupdates are not 314 * active. Otherwise we must flush them with data, 315 * since dependencies prevent data block writes. 316 */ 317 if (waitfor == MNT_WAIT && bp->b_lblkno <= -UFS_NDADDR && 318 (lbn_level(bp->b_lblkno) >= passes || 319 ((flags & DATA_ONLY) != 0 && !DOINGSOFTDEP(vp)))) 320 continue; 321 if (bp->b_lblkno > lbn) 322 panic("ffs_syncvnode: syncing truncated data."); 323 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL) == 0) { 324 BO_UNLOCK(bo); 325 } else if (wait) { 326 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL | 327 LK_INTERLOCK | wflag, BO_LOCKPTR(bo)) != 0) { 328 BO_LOCK(bo); 329 bp->b_vflags &= ~BV_SCANNED; 330 goto next_locked; 331 } 332 } else 333 continue; 334 if ((bp->b_flags & B_DELWRI) == 0) 335 panic("ffs_fsync: not dirty"); 336 /* 337 * Check for dependencies and potentially complete them. 338 */ 339 if (!LIST_EMPTY(&bp->b_dep) && 340 (error = softdep_sync_buf(vp, bp, 341 wait ? MNT_WAIT : MNT_NOWAIT)) != 0) { 342 /* 343 * Lock order conflict, buffer was already unlocked, 344 * and vnode possibly unlocked. 345 */ 346 if (error == ERELOOKUP) { 347 if (vp->v_data == NULL) 348 return (EBADF); 349 unlocked = true; 350 if (DOINGSOFTDEP(vp) && waitfor == MNT_WAIT && 351 (error = softdep_sync_metadata(vp)) != 0) { 352 if (ffs_fsfail_cleanup(ump, error)) 353 error = 0; 354 return (unlocked && error == 0 ? 355 ERELOOKUP : error); 356 } 357 /* Re-evaluate inode size */ 358 lbn = lblkno(ITOFS(ip), (ip->i_size + 359 ITOFS(ip)->fs_bsize - 1)); 360 goto next; 361 } 362 /* I/O error. */ 363 if (error != EBUSY) { 364 BUF_UNLOCK(bp); 365 return (error); 366 } 367 /* If we deferred once, don't defer again. */ 368 if ((bp->b_flags & B_DEFERRED) == 0) { 369 bp->b_flags |= B_DEFERRED; 370 BUF_UNLOCK(bp); 371 goto next; 372 } 373 } 374 if (wait) { 375 bremfree(bp); 376 error = bwrite(bp); 377 if (ffs_fsfail_cleanup(ump, error)) 378 error = 0; 379 if (error != 0) 380 return (error); 381 } else if ((bp->b_flags & B_CLUSTEROK)) { 382 (void) vfs_bio_awrite(bp); 383 } else { 384 bremfree(bp); 385 (void) bawrite(bp); 386 } 387 next: 388 /* 389 * Since we may have slept during the I/O, we need 390 * to start from a known point. 391 */ 392 BO_LOCK(bo); 393 next_locked: 394 nbp = TAILQ_FIRST(&bo->bo_dirty.bv_hd); 395 } 396 if (waitfor != MNT_WAIT) { 397 BO_UNLOCK(bo); 398 if ((flags & NO_INO_UPDT) != 0) 399 return (unlocked ? ERELOOKUP : 0); 400 error = ffs_update(vp, 0); 401 if (error == 0 && unlocked) 402 error = ERELOOKUP; 403 return (error); 404 } 405 /* Drain IO to see if we're done. */ 406 bufobj_wwait(bo, 0, 0); 407 /* 408 * Block devices associated with filesystems may have new I/O 409 * requests posted for them even if the vnode is locked, so no 410 * amount of trying will get them clean. We make several passes 411 * as a best effort. 412 * 413 * Regular files may need multiple passes to flush all dependency 414 * work as it is possible that we must write once per indirect 415 * level, once for the leaf, and once for the inode and each of 416 * these will be done with one sync and one async pass. 417 */ 418 if (bo->bo_dirty.bv_cnt > 0) { 419 if ((flags & DATA_ONLY) == 0) { 420 still_dirty = true; 421 } else { 422 /* 423 * For data-only sync, dirty indirect buffers 424 * are ignored. 425 */ 426 still_dirty = false; 427 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 428 if (bp->b_lblkno > -UFS_NDADDR) { 429 still_dirty = true; 430 break; 431 } 432 } 433 } 434 435 if (still_dirty) { 436 /* Write the inode after sync passes to flush deps. */ 437 if (wait && DOINGSOFTDEP(vp) && 438 (flags & NO_INO_UPDT) == 0) { 439 BO_UNLOCK(bo); 440 ffs_update(vp, 1); 441 BO_LOCK(bo); 442 } 443 /* switch between sync/async. */ 444 wait = !wait; 445 if (wait || ++passes < UFS_NIADDR + 2) 446 goto loop; 447 } 448 } 449 BO_UNLOCK(bo); 450 error = 0; 451 if ((flags & DATA_ONLY) == 0) { 452 if ((flags & NO_INO_UPDT) == 0) 453 error = ffs_update(vp, 1); 454 if (DOINGSUJ(vp)) 455 softdep_journal_fsync(VTOI(vp)); 456 } else if ((ip->i_flags & (IN_SIZEMOD | IN_IBLKDATA)) != 0) { 457 error = ffs_update(vp, 1); 458 } 459 if (error == 0 && unlocked) 460 error = ERELOOKUP; 461 if (error == 0) 462 ip->i_flag &= ~IN_NEEDSYNC; 463 return (error); 464 } 465 466 static int 467 ffs_fdatasync(struct vop_fdatasync_args *ap) 468 { 469 470 return (ffs_syncvnode(ap->a_vp, MNT_WAIT, DATA_ONLY)); 471 } 472 473 static int 474 ffs_lock( 475 struct vop_lock1_args /* { 476 struct vnode *a_vp; 477 int a_flags; 478 char *file; 479 int line; 480 } */ *ap) 481 { 482 #if !defined(NO_FFS_SNAPSHOT) || defined(DIAGNOSTIC) 483 struct vnode *vp = ap->a_vp; 484 #endif /* !NO_FFS_SNAPSHOT || DIAGNOSTIC */ 485 #ifdef DIAGNOSTIC 486 struct inode *ip; 487 #endif /* DIAGNOSTIC */ 488 int result; 489 #ifndef NO_FFS_SNAPSHOT 490 int flags; 491 struct lock *lkp; 492 493 /* 494 * Adaptive spinning mixed with SU leads to trouble. use a giant hammer 495 * and only use it when LK_NODDLKTREAT is set. Currently this means it 496 * is only used during path lookup. 497 */ 498 if ((ap->a_flags & LK_NODDLKTREAT) != 0) 499 ap->a_flags |= LK_ADAPTIVE; 500 switch (ap->a_flags & LK_TYPE_MASK) { 501 case LK_SHARED: 502 case LK_UPGRADE: 503 case LK_EXCLUSIVE: 504 flags = ap->a_flags; 505 for (;;) { 506 #ifdef DEBUG_VFS_LOCKS 507 VNPASS(vp->v_holdcnt != 0, vp); 508 #endif /* DEBUG_VFS_LOCKS */ 509 lkp = vp->v_vnlock; 510 result = lockmgr_lock_flags(lkp, flags, 511 &VI_MTX(vp)->lock_object, ap->a_file, ap->a_line); 512 if (lkp == vp->v_vnlock || result != 0) 513 break; 514 /* 515 * Apparent success, except that the vnode 516 * mutated between snapshot file vnode and 517 * regular file vnode while this process 518 * slept. The lock currently held is not the 519 * right lock. Release it, and try to get the 520 * new lock. 521 */ 522 lockmgr_unlock(lkp); 523 if ((flags & (LK_INTERLOCK | LK_NOWAIT)) == 524 (LK_INTERLOCK | LK_NOWAIT)) 525 return (EBUSY); 526 if ((flags & LK_TYPE_MASK) == LK_UPGRADE) 527 flags = (flags & ~LK_TYPE_MASK) | LK_EXCLUSIVE; 528 flags &= ~LK_INTERLOCK; 529 } 530 #ifdef DIAGNOSTIC 531 switch (ap->a_flags & LK_TYPE_MASK) { 532 case LK_UPGRADE: 533 case LK_EXCLUSIVE: 534 if (result == 0 && vp->v_vnlock->lk_recurse == 0) { 535 ip = VTOI(vp); 536 if (ip != NULL) 537 ip->i_lock_gen++; 538 } 539 } 540 #endif /* DIAGNOSTIC */ 541 break; 542 default: 543 #ifdef DIAGNOSTIC 544 if ((ap->a_flags & LK_TYPE_MASK) == LK_DOWNGRADE) { 545 ip = VTOI(vp); 546 if (ip != NULL) 547 ufs_unlock_tracker(ip); 548 } 549 #endif /* DIAGNOSTIC */ 550 result = VOP_LOCK1_APV(&ufs_vnodeops, ap); 551 break; 552 } 553 #else /* NO_FFS_SNAPSHOT */ 554 /* 555 * See above for an explanation. 556 */ 557 if ((ap->a_flags & LK_NODDLKTREAT) != 0) 558 ap->a_flags |= LK_ADAPTIVE; 559 #ifdef DIAGNOSTIC 560 if ((ap->a_flags & LK_TYPE_MASK) == LK_DOWNGRADE) { 561 ip = VTOI(vp); 562 if (ip != NULL) 563 ufs_unlock_tracker(ip); 564 } 565 #endif /* DIAGNOSTIC */ 566 result = VOP_LOCK1_APV(&ufs_vnodeops, ap); 567 #endif /* NO_FFS_SNAPSHOT */ 568 #ifdef DIAGNOSTIC 569 switch (ap->a_flags & LK_TYPE_MASK) { 570 case LK_UPGRADE: 571 case LK_EXCLUSIVE: 572 if (result == 0 && vp->v_vnlock->lk_recurse == 0) { 573 ip = VTOI(vp); 574 if (ip != NULL) 575 ip->i_lock_gen++; 576 } 577 } 578 #endif /* DIAGNOSTIC */ 579 return (result); 580 } 581 582 #ifdef INVARIANTS 583 static int 584 ffs_unlock_debug(struct vop_unlock_args *ap) 585 { 586 struct vnode *vp; 587 struct inode *ip; 588 589 vp = ap->a_vp; 590 ip = VTOI(vp); 591 if (ip->i_flag & UFS_INODE_FLAG_LAZY_MASK_ASSERTABLE) { 592 if ((vp->v_mflag & VMP_LAZYLIST) == 0) { 593 VI_LOCK(vp); 594 VNASSERT((vp->v_mflag & VMP_LAZYLIST), vp, 595 ("%s: modified vnode (%x) not on lazy list", 596 __func__, ip->i_flag)); 597 VI_UNLOCK(vp); 598 } 599 } 600 KASSERT(vp->v_type != VDIR || vp->v_vnlock->lk_recurse != 0 || 601 (ip->i_flag & IN_ENDOFF) == 0, 602 ("ufs dir vp %p ip %p flags %#x", vp, ip, ip->i_flag)); 603 #ifdef DIAGNOSTIC 604 if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE && ip != NULL && 605 vp->v_vnlock->lk_recurse == 0) 606 ufs_unlock_tracker(ip); 607 #endif 608 return (VOP_UNLOCK_APV(&ufs_vnodeops, ap)); 609 } 610 #endif 611 612 static int 613 ffs_read_hole(struct uio *uio, long xfersize, long *size) 614 { 615 ssize_t saved_resid, tlen; 616 int error; 617 618 while (xfersize > 0) { 619 tlen = min(xfersize, ZERO_REGION_SIZE); 620 saved_resid = uio->uio_resid; 621 error = vn_io_fault_uiomove(__DECONST(void *, zero_region), 622 tlen, uio); 623 if (error != 0) 624 return (error); 625 tlen = saved_resid - uio->uio_resid; 626 xfersize -= tlen; 627 *size -= tlen; 628 } 629 return (0); 630 } 631 632 /* 633 * Vnode op for reading. 634 */ 635 static int 636 ffs_read( 637 struct vop_read_args /* { 638 struct vnode *a_vp; 639 struct uio *a_uio; 640 int a_ioflag; 641 struct ucred *a_cred; 642 } */ *ap) 643 { 644 struct vnode *vp; 645 struct inode *ip; 646 struct uio *uio; 647 struct fs *fs; 648 struct buf *bp; 649 ufs_lbn_t lbn, nextlbn; 650 off_t bytesinfile; 651 long size, xfersize, blkoffset; 652 ssize_t orig_resid; 653 int bflag, error, ioflag, seqcount; 654 655 vp = ap->a_vp; 656 uio = ap->a_uio; 657 ioflag = ap->a_ioflag; 658 if (ap->a_ioflag & IO_EXT) 659 #ifdef notyet 660 return (ffs_extread(vp, uio, ioflag)); 661 #else 662 panic("ffs_read+IO_EXT"); 663 #endif 664 #ifdef DIRECTIO 665 if ((ioflag & IO_DIRECT) != 0) { 666 int workdone; 667 668 error = ffs_rawread(vp, uio, &workdone); 669 if (error != 0 || workdone != 0) 670 return error; 671 } 672 #endif 673 674 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 675 ip = VTOI(vp); 676 677 #ifdef INVARIANTS 678 if (uio->uio_rw != UIO_READ) 679 panic("ffs_read: mode"); 680 681 if (vp->v_type == VLNK) { 682 if ((int)ip->i_size < VFSTOUFS(vp->v_mount)->um_maxsymlinklen) 683 panic("ffs_read: short symlink"); 684 } else if (vp->v_type != VREG && vp->v_type != VDIR) 685 panic("ffs_read: type %d", vp->v_type); 686 #endif 687 orig_resid = uio->uio_resid; 688 KASSERT(orig_resid >= 0, ("ffs_read: uio->uio_resid < 0")); 689 if (orig_resid == 0) 690 return (0); 691 KASSERT(uio->uio_offset >= 0, ("ffs_read: uio->uio_offset < 0")); 692 fs = ITOFS(ip); 693 if (uio->uio_offset < ip->i_size && 694 uio->uio_offset >= fs->fs_maxfilesize) 695 return (EOVERFLOW); 696 697 bflag = GB_UNMAPPED | (uio->uio_segflg == UIO_NOCOPY ? 0 : GB_NOSPARSE); 698 #ifdef WITNESS 699 bflag |= IS_SNAPSHOT(ip) ? GB_NOWITNESS : 0; 700 #endif 701 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 702 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0) 703 break; 704 lbn = lblkno(fs, uio->uio_offset); 705 nextlbn = lbn + 1; 706 707 /* 708 * size of buffer. The buffer representing the 709 * end of the file is rounded up to the size of 710 * the block type ( fragment or full block, 711 * depending ). 712 */ 713 size = blksize(fs, ip, lbn); 714 blkoffset = blkoff(fs, uio->uio_offset); 715 716 /* 717 * The amount we want to transfer in this iteration is 718 * one FS block less the amount of the data before 719 * our startpoint (duh!) 720 */ 721 xfersize = fs->fs_bsize - blkoffset; 722 723 /* 724 * But if we actually want less than the block, 725 * or the file doesn't have a whole block more of data, 726 * then use the lesser number. 727 */ 728 if (uio->uio_resid < xfersize) 729 xfersize = uio->uio_resid; 730 if (bytesinfile < xfersize) 731 xfersize = bytesinfile; 732 733 if (lblktosize(fs, nextlbn) >= ip->i_size) { 734 /* 735 * Don't do readahead if this is the end of the file. 736 */ 737 error = bread_gb(vp, lbn, size, NOCRED, bflag, &bp); 738 } else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { 739 /* 740 * Otherwise if we are allowed to cluster, 741 * grab as much as we can. 742 * 743 * XXX This may not be a win if we are not 744 * doing sequential access. 745 */ 746 error = cluster_read(vp, ip->i_size, lbn, 747 size, NOCRED, blkoffset + uio->uio_resid, 748 seqcount, bflag, &bp); 749 } else if (seqcount > 1) { 750 /* 751 * If we are NOT allowed to cluster, then 752 * if we appear to be acting sequentially, 753 * fire off a request for a readahead 754 * as well as a read. Note that the 4th and 5th 755 * arguments point to arrays of the size specified in 756 * the 6th argument. 757 */ 758 u_int nextsize = blksize(fs, ip, nextlbn); 759 error = breadn_flags(vp, lbn, lbn, size, &nextlbn, 760 &nextsize, 1, NOCRED, bflag, NULL, &bp); 761 } else { 762 /* 763 * Failing all of the above, just read what the 764 * user asked for. Interestingly, the same as 765 * the first option above. 766 */ 767 error = bread_gb(vp, lbn, size, NOCRED, bflag, &bp); 768 } 769 if (error == EJUSTRETURN) { 770 error = ffs_read_hole(uio, xfersize, &size); 771 if (error == 0) 772 continue; 773 } 774 if (error != 0) { 775 brelse(bp); 776 bp = NULL; 777 break; 778 } 779 780 /* 781 * We should only get non-zero b_resid when an I/O error 782 * has occurred, which should cause us to break above. 783 * However, if the short read did not cause an error, 784 * then we want to ensure that we do not uiomove bad 785 * or uninitialized data. 786 */ 787 size -= bp->b_resid; 788 if (size < xfersize) { 789 if (size == 0) 790 break; 791 xfersize = size; 792 } 793 794 if (buf_mapped(bp)) { 795 error = vn_io_fault_uiomove((char *)bp->b_data + 796 blkoffset, (int)xfersize, uio); 797 } else { 798 error = vn_io_fault_pgmove(bp->b_pages, 799 blkoffset + (bp->b_offset & PAGE_MASK), 800 (int)xfersize, uio); 801 } 802 if (error) 803 break; 804 805 vfs_bio_brelse(bp, ioflag); 806 } 807 808 /* 809 * This can only happen in the case of an error 810 * because the loop above resets bp to NULL on each iteration 811 * and on normal completion has not set a new value into it. 812 * so it must have come from a 'break' statement 813 */ 814 if (bp != NULL) 815 vfs_bio_brelse(bp, ioflag); 816 817 if ((error == 0 || uio->uio_resid != orig_resid) && 818 (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 819 UFS_INODE_SET_FLAG_SHARED(ip, IN_ACCESS); 820 return (error); 821 } 822 823 /* 824 * Vnode op for writing. 825 */ 826 static int 827 ffs_write( 828 struct vop_write_args /* { 829 struct vnode *a_vp; 830 struct uio *a_uio; 831 int a_ioflag; 832 struct ucred *a_cred; 833 } */ *ap) 834 { 835 struct vnode *vp; 836 struct uio *uio; 837 struct inode *ip; 838 struct fs *fs; 839 struct buf *bp; 840 ufs_lbn_t lbn; 841 off_t osize; 842 ssize_t resid, r; 843 int seqcount; 844 int blkoffset, error, flags, ioflag, size, xfersize; 845 846 vp = ap->a_vp; 847 if (DOINGSUJ(vp)) 848 softdep_prealloc(vp, MNT_WAIT); 849 if (vp->v_data == NULL) 850 return (EBADF); 851 852 uio = ap->a_uio; 853 ioflag = ap->a_ioflag; 854 if (ap->a_ioflag & IO_EXT) 855 #ifdef notyet 856 return (ffs_extwrite(vp, uio, ioflag, ap->a_cred)); 857 #else 858 panic("ffs_write+IO_EXT"); 859 #endif 860 861 seqcount = ap->a_ioflag >> IO_SEQSHIFT; 862 ip = VTOI(vp); 863 864 #ifdef INVARIANTS 865 if (uio->uio_rw != UIO_WRITE) 866 panic("ffs_write: mode"); 867 #endif 868 869 switch (vp->v_type) { 870 case VREG: 871 if (ioflag & IO_APPEND) 872 uio->uio_offset = ip->i_size; 873 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size) 874 return (EPERM); 875 /* FALLTHROUGH */ 876 case VLNK: 877 break; 878 case VDIR: 879 panic("ffs_write: dir write"); 880 break; 881 default: 882 panic("ffs_write: type %p %d (%d,%d)", vp, (int)vp->v_type, 883 (int)uio->uio_offset, 884 (int)uio->uio_resid 885 ); 886 } 887 888 KASSERT(uio->uio_resid >= 0, ("ffs_write: uio->uio_resid < 0")); 889 KASSERT(uio->uio_offset >= 0, ("ffs_write: uio->uio_offset < 0")); 890 fs = ITOFS(ip); 891 892 /* 893 * Maybe this should be above the vnode op call, but so long as 894 * file servers have no limits, I don't think it matters. 895 */ 896 error = vn_rlimit_fsizex(vp, uio, fs->fs_maxfilesize, &r, 897 uio->uio_td); 898 if (error != 0) { 899 vn_rlimit_fsizex_res(uio, r); 900 return (error); 901 } 902 903 resid = uio->uio_resid; 904 osize = ip->i_size; 905 if (seqcount > BA_SEQMAX) 906 flags = BA_SEQMAX << BA_SEQSHIFT; 907 else 908 flags = seqcount << BA_SEQSHIFT; 909 if (ioflag & IO_SYNC) 910 flags |= IO_SYNC; 911 flags |= BA_UNMAPPED; 912 913 for (error = 0; uio->uio_resid > 0;) { 914 lbn = lblkno(fs, uio->uio_offset); 915 blkoffset = blkoff(fs, uio->uio_offset); 916 xfersize = fs->fs_bsize - blkoffset; 917 if (uio->uio_resid < xfersize) 918 xfersize = uio->uio_resid; 919 if (uio->uio_offset + xfersize > ip->i_size) 920 vnode_pager_setsize(vp, uio->uio_offset + xfersize); 921 922 /* 923 * We must perform a read-before-write if the transfer size 924 * does not cover the entire buffer. 925 */ 926 if (fs->fs_bsize > xfersize) 927 flags |= BA_CLRBUF; 928 else 929 flags &= ~BA_CLRBUF; 930 /* XXX is uio->uio_offset the right thing here? */ 931 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 932 ap->a_cred, flags, &bp); 933 if (error != 0) { 934 vnode_pager_setsize(vp, ip->i_size); 935 break; 936 } 937 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL)) 938 bp->b_flags |= B_NOCACHE; 939 940 if (uio->uio_offset + xfersize > ip->i_size) { 941 ip->i_size = uio->uio_offset + xfersize; 942 DIP_SET(ip, i_size, ip->i_size); 943 UFS_INODE_SET_FLAG(ip, IN_SIZEMOD | IN_CHANGE); 944 } 945 946 size = blksize(fs, ip, lbn) - bp->b_resid; 947 if (size < xfersize) 948 xfersize = size; 949 950 if (buf_mapped(bp)) { 951 error = vn_io_fault_uiomove((char *)bp->b_data + 952 blkoffset, (int)xfersize, uio); 953 } else { 954 error = vn_io_fault_pgmove(bp->b_pages, 955 blkoffset + (bp->b_offset & PAGE_MASK), 956 (int)xfersize, uio); 957 } 958 /* 959 * If the buffer is not already filled and we encounter an 960 * error while trying to fill it, we have to clear out any 961 * garbage data from the pages instantiated for the buffer. 962 * If we do not, a failed uiomove() during a write can leave 963 * the prior contents of the pages exposed to a userland mmap. 964 * 965 * Note that we need only clear buffers with a transfer size 966 * equal to the block size because buffers with a shorter 967 * transfer size were cleared above by the call to UFS_BALLOC() 968 * with the BA_CLRBUF flag set. 969 * 970 * If the source region for uiomove identically mmaps the 971 * buffer, uiomove() performed the NOP copy, and the buffer 972 * content remains valid because the page fault handler 973 * validated the pages. 974 */ 975 if (error != 0 && (bp->b_flags & B_CACHE) == 0 && 976 fs->fs_bsize == xfersize) 977 vfs_bio_clrbuf(bp); 978 979 vfs_bio_set_flags(bp, ioflag); 980 981 /* 982 * If IO_SYNC each buffer is written synchronously. Otherwise 983 * if we have a severe page deficiency write the buffer 984 * asynchronously. Otherwise try to cluster, and if that 985 * doesn't do it then either do an async write (if O_DIRECT), 986 * or a delayed write (if not). 987 */ 988 if (ioflag & IO_SYNC) { 989 (void)bwrite(bp); 990 } else if (vm_page_count_severe() || 991 buf_dirty_count_severe() || 992 (ioflag & IO_ASYNC)) { 993 bp->b_flags |= B_CLUSTEROK; 994 bawrite(bp); 995 } else if (xfersize + blkoffset == fs->fs_bsize) { 996 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) { 997 bp->b_flags |= B_CLUSTEROK; 998 cluster_write(vp, &ip->i_clusterw, bp, 999 ip->i_size, seqcount, GB_UNMAPPED); 1000 } else { 1001 bawrite(bp); 1002 } 1003 } else if (ioflag & IO_DIRECT) { 1004 bp->b_flags |= B_CLUSTEROK; 1005 bawrite(bp); 1006 } else { 1007 bp->b_flags |= B_CLUSTEROK; 1008 bdwrite(bp); 1009 } 1010 if (error || xfersize == 0) 1011 break; 1012 UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE); 1013 } 1014 /* 1015 * If we successfully wrote any data, and we are not the superuser 1016 * we clear the setuid and setgid bits as a precaution against 1017 * tampering. 1018 */ 1019 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && 1020 ap->a_cred) { 1021 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID)) { 1022 vn_seqc_write_begin(vp); 1023 UFS_INODE_SET_MODE(ip, ip->i_mode & ~(ISUID | ISGID)); 1024 DIP_SET(ip, i_mode, ip->i_mode); 1025 vn_seqc_write_end(vp); 1026 } 1027 } 1028 if (error) { 1029 if (ioflag & IO_UNIT) { 1030 (void)ffs_truncate(vp, osize, 1031 IO_NORMAL | (ioflag & IO_SYNC), ap->a_cred); 1032 uio->uio_offset -= resid - uio->uio_resid; 1033 uio->uio_resid = resid; 1034 } 1035 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) { 1036 if (!(ioflag & IO_DATASYNC) || 1037 (ip->i_flags & (IN_SIZEMOD | IN_IBLKDATA))) 1038 error = ffs_update(vp, 1); 1039 if (ffs_fsfail_cleanup(VFSTOUFS(vp->v_mount), error)) 1040 error = ENXIO; 1041 } 1042 vn_rlimit_fsizex_res(uio, r); 1043 return (error); 1044 } 1045 1046 /* 1047 * Extended attribute area reading. 1048 */ 1049 static int 1050 ffs_extread(struct vnode *vp, struct uio *uio, int ioflag) 1051 { 1052 struct inode *ip; 1053 struct ufs2_dinode *dp; 1054 struct fs *fs; 1055 struct buf *bp; 1056 ufs_lbn_t lbn, nextlbn; 1057 off_t bytesinfile; 1058 long size, xfersize, blkoffset; 1059 ssize_t orig_resid; 1060 int error; 1061 1062 ip = VTOI(vp); 1063 fs = ITOFS(ip); 1064 dp = ip->i_din2; 1065 1066 #ifdef INVARIANTS 1067 if (uio->uio_rw != UIO_READ || fs->fs_magic != FS_UFS2_MAGIC) 1068 panic("ffs_extread: mode"); 1069 1070 #endif 1071 orig_resid = uio->uio_resid; 1072 KASSERT(orig_resid >= 0, ("ffs_extread: uio->uio_resid < 0")); 1073 if (orig_resid == 0) 1074 return (0); 1075 KASSERT(uio->uio_offset >= 0, ("ffs_extread: uio->uio_offset < 0")); 1076 1077 for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { 1078 if ((bytesinfile = dp->di_extsize - uio->uio_offset) <= 0) 1079 break; 1080 lbn = lblkno(fs, uio->uio_offset); 1081 nextlbn = lbn + 1; 1082 1083 /* 1084 * size of buffer. The buffer representing the 1085 * end of the file is rounded up to the size of 1086 * the block type ( fragment or full block, 1087 * depending ). 1088 */ 1089 size = sblksize(fs, dp->di_extsize, lbn); 1090 blkoffset = blkoff(fs, uio->uio_offset); 1091 1092 /* 1093 * The amount we want to transfer in this iteration is 1094 * one FS block less the amount of the data before 1095 * our startpoint (duh!) 1096 */ 1097 xfersize = fs->fs_bsize - blkoffset; 1098 1099 /* 1100 * But if we actually want less than the block, 1101 * or the file doesn't have a whole block more of data, 1102 * then use the lesser number. 1103 */ 1104 if (uio->uio_resid < xfersize) 1105 xfersize = uio->uio_resid; 1106 if (bytesinfile < xfersize) 1107 xfersize = bytesinfile; 1108 1109 if (lblktosize(fs, nextlbn) >= dp->di_extsize) { 1110 /* 1111 * Don't do readahead if this is the end of the info. 1112 */ 1113 error = bread(vp, -1 - lbn, size, NOCRED, &bp); 1114 } else { 1115 /* 1116 * If we have a second block, then 1117 * fire off a request for a readahead 1118 * as well as a read. Note that the 4th and 5th 1119 * arguments point to arrays of the size specified in 1120 * the 6th argument. 1121 */ 1122 u_int nextsize = sblksize(fs, dp->di_extsize, nextlbn); 1123 1124 nextlbn = -1 - nextlbn; 1125 error = breadn(vp, -1 - lbn, 1126 size, &nextlbn, &nextsize, 1, NOCRED, &bp); 1127 } 1128 if (error) { 1129 brelse(bp); 1130 bp = NULL; 1131 break; 1132 } 1133 1134 /* 1135 * We should only get non-zero b_resid when an I/O error 1136 * has occurred, which should cause us to break above. 1137 * However, if the short read did not cause an error, 1138 * then we want to ensure that we do not uiomove bad 1139 * or uninitialized data. 1140 */ 1141 size -= bp->b_resid; 1142 if (size < xfersize) { 1143 if (size == 0) 1144 break; 1145 xfersize = size; 1146 } 1147 1148 error = uiomove((char *)bp->b_data + blkoffset, 1149 (int)xfersize, uio); 1150 if (error) 1151 break; 1152 vfs_bio_brelse(bp, ioflag); 1153 } 1154 1155 /* 1156 * This can only happen in the case of an error 1157 * because the loop above resets bp to NULL on each iteration 1158 * and on normal completion has not set a new value into it. 1159 * so it must have come from a 'break' statement 1160 */ 1161 if (bp != NULL) 1162 vfs_bio_brelse(bp, ioflag); 1163 return (error); 1164 } 1165 1166 /* 1167 * Extended attribute area writing. 1168 */ 1169 static int 1170 ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *ucred) 1171 { 1172 struct inode *ip; 1173 struct ufs2_dinode *dp; 1174 struct fs *fs; 1175 struct buf *bp; 1176 ufs_lbn_t lbn; 1177 off_t osize; 1178 ssize_t resid; 1179 int blkoffset, error, flags, size, xfersize; 1180 1181 ip = VTOI(vp); 1182 fs = ITOFS(ip); 1183 dp = ip->i_din2; 1184 1185 #ifdef INVARIANTS 1186 if (uio->uio_rw != UIO_WRITE || fs->fs_magic != FS_UFS2_MAGIC) 1187 panic("ffs_extwrite: mode"); 1188 #endif 1189 1190 if (ioflag & IO_APPEND) 1191 uio->uio_offset = dp->di_extsize; 1192 KASSERT(uio->uio_offset >= 0, ("ffs_extwrite: uio->uio_offset < 0")); 1193 KASSERT(uio->uio_resid >= 0, ("ffs_extwrite: uio->uio_resid < 0")); 1194 if ((uoff_t)uio->uio_offset + uio->uio_resid > 1195 UFS_NXADDR * fs->fs_bsize) 1196 return (EFBIG); 1197 1198 resid = uio->uio_resid; 1199 osize = dp->di_extsize; 1200 flags = IO_EXT; 1201 if (ioflag & IO_SYNC) 1202 flags |= IO_SYNC; 1203 1204 for (error = 0; uio->uio_resid > 0;) { 1205 lbn = lblkno(fs, uio->uio_offset); 1206 blkoffset = blkoff(fs, uio->uio_offset); 1207 xfersize = fs->fs_bsize - blkoffset; 1208 if (uio->uio_resid < xfersize) 1209 xfersize = uio->uio_resid; 1210 1211 /* 1212 * We must perform a read-before-write if the transfer size 1213 * does not cover the entire buffer. 1214 */ 1215 if (fs->fs_bsize > xfersize) 1216 flags |= BA_CLRBUF; 1217 else 1218 flags &= ~BA_CLRBUF; 1219 error = UFS_BALLOC(vp, uio->uio_offset, xfersize, 1220 ucred, flags, &bp); 1221 if (error != 0) 1222 break; 1223 /* 1224 * If the buffer is not valid we have to clear out any 1225 * garbage data from the pages instantiated for the buffer. 1226 * If we do not, a failed uiomove() during a write can leave 1227 * the prior contents of the pages exposed to a userland 1228 * mmap(). XXX deal with uiomove() errors a better way. 1229 */ 1230 if ((bp->b_flags & B_CACHE) == 0 && fs->fs_bsize <= xfersize) 1231 vfs_bio_clrbuf(bp); 1232 1233 if (uio->uio_offset + xfersize > dp->di_extsize) { 1234 dp->di_extsize = uio->uio_offset + xfersize; 1235 UFS_INODE_SET_FLAG(ip, IN_SIZEMOD | IN_CHANGE); 1236 } 1237 1238 size = sblksize(fs, dp->di_extsize, lbn) - bp->b_resid; 1239 if (size < xfersize) 1240 xfersize = size; 1241 1242 error = 1243 uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio); 1244 1245 vfs_bio_set_flags(bp, ioflag); 1246 1247 /* 1248 * If IO_SYNC each buffer is written synchronously. Otherwise 1249 * if we have a severe page deficiency write the buffer 1250 * asynchronously. Otherwise try to cluster, and if that 1251 * doesn't do it then either do an async write (if O_DIRECT), 1252 * or a delayed write (if not). 1253 */ 1254 if (ioflag & IO_SYNC) { 1255 (void)bwrite(bp); 1256 } else if (vm_page_count_severe() || 1257 buf_dirty_count_severe() || 1258 xfersize + blkoffset == fs->fs_bsize || 1259 (ioflag & (IO_ASYNC | IO_DIRECT))) 1260 bawrite(bp); 1261 else 1262 bdwrite(bp); 1263 if (error || xfersize == 0) 1264 break; 1265 UFS_INODE_SET_FLAG(ip, IN_CHANGE); 1266 } 1267 /* 1268 * If we successfully wrote any data, and we are not the superuser 1269 * we clear the setuid and setgid bits as a precaution against 1270 * tampering. 1271 */ 1272 if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid && ucred) { 1273 if (priv_check_cred(ucred, PRIV_VFS_RETAINSUGID)) { 1274 vn_seqc_write_begin(vp); 1275 UFS_INODE_SET_MODE(ip, ip->i_mode & ~(ISUID | ISGID)); 1276 dp->di_mode = ip->i_mode; 1277 vn_seqc_write_end(vp); 1278 } 1279 } 1280 if (error) { 1281 if (ioflag & IO_UNIT) { 1282 (void)ffs_truncate(vp, osize, 1283 IO_EXT | (ioflag&IO_SYNC), ucred); 1284 uio->uio_offset -= resid - uio->uio_resid; 1285 uio->uio_resid = resid; 1286 } 1287 } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) 1288 error = ffs_update(vp, 1); 1289 return (error); 1290 } 1291 1292 /* 1293 * Vnode operating to retrieve a named extended attribute. 1294 * 1295 * Locate a particular EA (nspace:name) in the area (ptr:length), and return 1296 * the length of the EA, and possibly the pointer to the entry and to the data. 1297 */ 1298 static int 1299 ffs_findextattr(u_char *ptr, u_int length, int nspace, const char *name, 1300 struct extattr **eapp, u_char **eac) 1301 { 1302 struct extattr *eap, *eaend; 1303 size_t nlen; 1304 1305 nlen = strlen(name); 1306 KASSERT(ALIGNED_TO(ptr, struct extattr), ("unaligned")); 1307 eap = (struct extattr *)ptr; 1308 eaend = (struct extattr *)(ptr + length); 1309 for (; eap < eaend; eap = EXTATTR_NEXT(eap)) { 1310 KASSERT(EXTATTR_NEXT(eap) <= eaend, 1311 ("extattr next %p beyond %p", EXTATTR_NEXT(eap), eaend)); 1312 if (eap->ea_namespace != nspace || eap->ea_namelength != nlen 1313 || memcmp(eap->ea_name, name, nlen) != 0) 1314 continue; 1315 if (eapp != NULL) 1316 *eapp = eap; 1317 if (eac != NULL) 1318 *eac = EXTATTR_CONTENT(eap); 1319 return (EXTATTR_CONTENT_SIZE(eap)); 1320 } 1321 return (-1); 1322 } 1323 1324 static int 1325 ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td) 1326 { 1327 const struct extattr *eap, *eaend, *eapnext; 1328 struct inode *ip; 1329 struct ufs2_dinode *dp; 1330 struct fs *fs; 1331 struct uio luio; 1332 struct iovec liovec; 1333 u_int easize; 1334 int error; 1335 u_char *eae; 1336 1337 ip = VTOI(vp); 1338 fs = ITOFS(ip); 1339 dp = ip->i_din2; 1340 easize = dp->di_extsize; 1341 if ((uoff_t)easize > UFS_NXADDR * fs->fs_bsize) 1342 return (EFBIG); 1343 1344 eae = malloc(easize, M_TEMP, M_WAITOK); 1345 1346 liovec.iov_base = eae; 1347 liovec.iov_len = easize; 1348 luio.uio_iov = &liovec; 1349 luio.uio_iovcnt = 1; 1350 luio.uio_offset = 0; 1351 luio.uio_resid = easize; 1352 luio.uio_segflg = UIO_SYSSPACE; 1353 luio.uio_rw = UIO_READ; 1354 luio.uio_td = td; 1355 1356 error = ffs_extread(vp, &luio, IO_EXT | IO_SYNC); 1357 if (error) { 1358 free(eae, M_TEMP); 1359 return (error); 1360 } 1361 /* Validate disk xattrfile contents. */ 1362 for (eap = (void *)eae, eaend = (void *)(eae + easize); eap < eaend; 1363 eap = eapnext) { 1364 /* Detect zeroed out tail */ 1365 if (eap->ea_length < sizeof(*eap) || eap->ea_length == 0) { 1366 easize = (const u_char *)eap - eae; 1367 break; 1368 } 1369 1370 eapnext = EXTATTR_NEXT(eap); 1371 /* Bogusly long entry. */ 1372 if (eapnext > eaend) { 1373 free(eae, M_TEMP); 1374 return (EINTEGRITY); 1375 } 1376 } 1377 ip->i_ea_len = easize; 1378 *p = eae; 1379 return (0); 1380 } 1381 1382 static void 1383 ffs_lock_ea(struct vnode *vp) 1384 { 1385 struct inode *ip; 1386 1387 ip = VTOI(vp); 1388 VI_LOCK(vp); 1389 while (ip->i_flag & IN_EA_LOCKED) { 1390 UFS_INODE_SET_FLAG(ip, IN_EA_LOCKWAIT); 1391 msleep(&ip->i_ea_refs, &vp->v_interlock, PINOD + 2, "ufs_ea", 1392 0); 1393 } 1394 UFS_INODE_SET_FLAG(ip, IN_EA_LOCKED); 1395 VI_UNLOCK(vp); 1396 } 1397 1398 static void 1399 ffs_unlock_ea(struct vnode *vp) 1400 { 1401 struct inode *ip; 1402 1403 ip = VTOI(vp); 1404 VI_LOCK(vp); 1405 if (ip->i_flag & IN_EA_LOCKWAIT) 1406 wakeup(&ip->i_ea_refs); 1407 ip->i_flag &= ~(IN_EA_LOCKED | IN_EA_LOCKWAIT); 1408 VI_UNLOCK(vp); 1409 } 1410 1411 static int 1412 ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td) 1413 { 1414 struct inode *ip; 1415 int error; 1416 1417 ip = VTOI(vp); 1418 1419 ffs_lock_ea(vp); 1420 if (ip->i_ea_area != NULL) { 1421 ip->i_ea_refs++; 1422 ffs_unlock_ea(vp); 1423 return (0); 1424 } 1425 error = ffs_rdextattr(&ip->i_ea_area, vp, td); 1426 if (error) { 1427 ffs_unlock_ea(vp); 1428 return (error); 1429 } 1430 ip->i_ea_error = 0; 1431 ip->i_ea_refs++; 1432 ffs_unlock_ea(vp); 1433 return (0); 1434 } 1435 1436 /* 1437 * Vnode extattr transaction commit/abort 1438 */ 1439 static int 1440 ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td) 1441 { 1442 struct inode *ip; 1443 struct uio luio; 1444 struct iovec *liovec; 1445 struct ufs2_dinode *dp; 1446 size_t ea_len, tlen; 1447 int error, i, lcnt; 1448 bool truncate; 1449 1450 ip = VTOI(vp); 1451 1452 ffs_lock_ea(vp); 1453 if (ip->i_ea_area == NULL) { 1454 ffs_unlock_ea(vp); 1455 return (EINVAL); 1456 } 1457 dp = ip->i_din2; 1458 error = ip->i_ea_error; 1459 truncate = false; 1460 if (commit && error == 0) { 1461 ASSERT_VOP_ELOCKED(vp, "ffs_close_ea commit"); 1462 if (cred == NOCRED) 1463 cred = vp->v_mount->mnt_cred; 1464 1465 ea_len = MAX(ip->i_ea_len, dp->di_extsize); 1466 for (lcnt = 1, tlen = ea_len - ip->i_ea_len; tlen > 0;) { 1467 tlen -= MIN(ZERO_REGION_SIZE, tlen); 1468 lcnt++; 1469 } 1470 1471 liovec = __builtin_alloca(lcnt * sizeof(struct iovec)); 1472 luio.uio_iovcnt = lcnt; 1473 1474 liovec[0].iov_base = ip->i_ea_area; 1475 liovec[0].iov_len = ip->i_ea_len; 1476 for (i = 1, tlen = ea_len - ip->i_ea_len; i < lcnt; i++) { 1477 liovec[i].iov_base = __DECONST(void *, zero_region); 1478 liovec[i].iov_len = MIN(ZERO_REGION_SIZE, tlen); 1479 tlen -= liovec[i].iov_len; 1480 } 1481 MPASS(tlen == 0); 1482 1483 luio.uio_iov = liovec; 1484 luio.uio_offset = 0; 1485 luio.uio_resid = ea_len; 1486 luio.uio_segflg = UIO_SYSSPACE; 1487 luio.uio_rw = UIO_WRITE; 1488 luio.uio_td = td; 1489 error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred); 1490 if (error == 0 && ip->i_ea_len == 0) 1491 truncate = true; 1492 } 1493 if (--ip->i_ea_refs == 0) { 1494 free(ip->i_ea_area, M_TEMP); 1495 ip->i_ea_area = NULL; 1496 ip->i_ea_len = 0; 1497 ip->i_ea_error = 0; 1498 } 1499 ffs_unlock_ea(vp); 1500 1501 if (truncate) 1502 ffs_truncate(vp, 0, IO_EXT, cred); 1503 return (error); 1504 } 1505 1506 /* 1507 * Vnode extattr strategy routine for fifos. 1508 * 1509 * We need to check for a read or write of the external attributes. 1510 * Otherwise we just fall through and do the usual thing. 1511 */ 1512 static int 1513 ffsext_strategy( 1514 struct vop_strategy_args /* { 1515 struct vnodeop_desc *a_desc; 1516 struct vnode *a_vp; 1517 struct buf *a_bp; 1518 } */ *ap) 1519 { 1520 struct vnode *vp; 1521 daddr_t lbn; 1522 1523 vp = ap->a_vp; 1524 lbn = ap->a_bp->b_lblkno; 1525 if (I_IS_UFS2(VTOI(vp)) && lbn < 0 && lbn >= -UFS_NXADDR) 1526 return (VOP_STRATEGY_APV(&ufs_vnodeops, ap)); 1527 if (vp->v_type == VFIFO) 1528 return (VOP_STRATEGY_APV(&ufs_fifoops, ap)); 1529 panic("spec nodes went here"); 1530 } 1531 1532 /* 1533 * Vnode extattr transaction commit/abort 1534 */ 1535 static int 1536 ffs_openextattr( 1537 struct vop_openextattr_args /* { 1538 struct vnodeop_desc *a_desc; 1539 struct vnode *a_vp; 1540 IN struct ucred *a_cred; 1541 IN struct thread *a_td; 1542 } */ *ap) 1543 { 1544 1545 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1546 return (EOPNOTSUPP); 1547 1548 return (ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td)); 1549 } 1550 1551 /* 1552 * Vnode extattr transaction commit/abort 1553 */ 1554 static int 1555 ffs_closeextattr( 1556 struct vop_closeextattr_args /* { 1557 struct vnodeop_desc *a_desc; 1558 struct vnode *a_vp; 1559 int a_commit; 1560 IN struct ucred *a_cred; 1561 IN struct thread *a_td; 1562 } */ *ap) 1563 { 1564 struct vnode *vp; 1565 1566 vp = ap->a_vp; 1567 if (vp->v_type == VCHR || vp->v_type == VBLK) 1568 return (EOPNOTSUPP); 1569 if (ap->a_commit && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) 1570 return (EROFS); 1571 1572 if (ap->a_commit && DOINGSUJ(vp)) { 1573 ASSERT_VOP_ELOCKED(vp, "ffs_closeextattr commit"); 1574 softdep_prealloc(vp, MNT_WAIT); 1575 if (vp->v_data == NULL) 1576 return (EBADF); 1577 } 1578 return (ffs_close_ea(vp, ap->a_commit, ap->a_cred, ap->a_td)); 1579 } 1580 1581 /* 1582 * Vnode operation to remove a named attribute. 1583 */ 1584 static int 1585 ffs_deleteextattr( 1586 struct vop_deleteextattr_args /* { 1587 IN struct vnode *a_vp; 1588 IN int a_attrnamespace; 1589 IN const char *a_name; 1590 IN struct ucred *a_cred; 1591 IN struct thread *a_td; 1592 } */ *ap) 1593 { 1594 struct vnode *vp; 1595 struct inode *ip; 1596 struct extattr *eap; 1597 uint32_t ul; 1598 int olen, error, i, easize; 1599 u_char *eae; 1600 void *tmp; 1601 1602 vp = ap->a_vp; 1603 ip = VTOI(vp); 1604 1605 if (vp->v_type == VCHR || vp->v_type == VBLK) 1606 return (EOPNOTSUPP); 1607 if (strlen(ap->a_name) == 0) 1608 return (EINVAL); 1609 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1610 return (EROFS); 1611 1612 error = extattr_check_cred(vp, ap->a_attrnamespace, 1613 ap->a_cred, ap->a_td, VWRITE); 1614 if (error) { 1615 /* 1616 * ffs_lock_ea is not needed there, because the vnode 1617 * must be exclusively locked. 1618 */ 1619 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1620 ip->i_ea_error = error; 1621 return (error); 1622 } 1623 1624 if (DOINGSUJ(vp)) { 1625 ASSERT_VOP_ELOCKED(vp, "ffs_deleteextattr"); 1626 softdep_prealloc(vp, MNT_WAIT); 1627 if (vp->v_data == NULL) 1628 return (EBADF); 1629 } 1630 1631 error = ffs_open_ea(vp, ap->a_cred, ap->a_td); 1632 if (error) 1633 return (error); 1634 1635 /* CEM: delete could be done in-place instead */ 1636 eae = malloc(ip->i_ea_len, M_TEMP, M_WAITOK); 1637 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1638 easize = ip->i_ea_len; 1639 1640 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1641 &eap, NULL); 1642 if (olen == -1) { 1643 /* delete but nonexistent */ 1644 free(eae, M_TEMP); 1645 ffs_close_ea(vp, 0, ap->a_cred, ap->a_td); 1646 return (ENOATTR); 1647 } 1648 ul = eap->ea_length; 1649 i = (u_char *)EXTATTR_NEXT(eap) - eae; 1650 bcopy(EXTATTR_NEXT(eap), eap, easize - i); 1651 easize -= ul; 1652 1653 tmp = ip->i_ea_area; 1654 ip->i_ea_area = eae; 1655 ip->i_ea_len = easize; 1656 free(tmp, M_TEMP); 1657 error = ffs_close_ea(vp, 1, ap->a_cred, ap->a_td); 1658 return (error); 1659 } 1660 1661 /* 1662 * Vnode operation to retrieve a named extended attribute. 1663 */ 1664 static int 1665 ffs_getextattr( 1666 struct vop_getextattr_args /* { 1667 IN struct vnode *a_vp; 1668 IN int a_attrnamespace; 1669 IN const char *a_name; 1670 INOUT struct uio *a_uio; 1671 OUT size_t *a_size; 1672 IN struct ucred *a_cred; 1673 IN struct thread *a_td; 1674 } */ *ap) 1675 { 1676 struct inode *ip; 1677 u_char *eae, *p; 1678 unsigned easize; 1679 int error, ealen; 1680 1681 ip = VTOI(ap->a_vp); 1682 1683 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1684 return (EOPNOTSUPP); 1685 1686 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1687 ap->a_cred, ap->a_td, VREAD); 1688 if (error) 1689 return (error); 1690 1691 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1692 if (error) 1693 return (error); 1694 1695 eae = ip->i_ea_area; 1696 easize = ip->i_ea_len; 1697 1698 ealen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1699 NULL, &p); 1700 if (ealen >= 0) { 1701 error = 0; 1702 if (ap->a_size != NULL) 1703 *ap->a_size = ealen; 1704 else if (ap->a_uio != NULL) 1705 error = uiomove(p, ealen, ap->a_uio); 1706 } else 1707 error = ENOATTR; 1708 1709 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1710 return (error); 1711 } 1712 1713 /* 1714 * Vnode operation to retrieve extended attributes on a vnode. 1715 */ 1716 static int 1717 ffs_listextattr( 1718 struct vop_listextattr_args /* { 1719 IN struct vnode *a_vp; 1720 IN int a_attrnamespace; 1721 INOUT struct uio *a_uio; 1722 OUT size_t *a_size; 1723 IN struct ucred *a_cred; 1724 IN struct thread *a_td; 1725 } */ *ap) 1726 { 1727 struct inode *ip; 1728 struct extattr *eap, *eaend; 1729 int error, ealen; 1730 1731 ip = VTOI(ap->a_vp); 1732 1733 if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK) 1734 return (EOPNOTSUPP); 1735 1736 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 1737 ap->a_cred, ap->a_td, VREAD); 1738 if (error) 1739 return (error); 1740 1741 error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td); 1742 if (error) 1743 return (error); 1744 1745 error = 0; 1746 if (ap->a_size != NULL) 1747 *ap->a_size = 0; 1748 1749 KASSERT(ALIGNED_TO(ip->i_ea_area, struct extattr), ("unaligned")); 1750 eap = (struct extattr *)ip->i_ea_area; 1751 eaend = (struct extattr *)(ip->i_ea_area + ip->i_ea_len); 1752 for (; error == 0 && eap < eaend; eap = EXTATTR_NEXT(eap)) { 1753 KASSERT(EXTATTR_NEXT(eap) <= eaend, 1754 ("extattr next %p beyond %p", EXTATTR_NEXT(eap), eaend)); 1755 if (eap->ea_namespace != ap->a_attrnamespace) 1756 continue; 1757 1758 ealen = eap->ea_namelength; 1759 if (ap->a_size != NULL) 1760 *ap->a_size += ealen + 1; 1761 else if (ap->a_uio != NULL) 1762 error = uiomove(&eap->ea_namelength, ealen + 1, 1763 ap->a_uio); 1764 } 1765 1766 ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td); 1767 return (error); 1768 } 1769 1770 /* 1771 * Vnode operation to set a named attribute. 1772 */ 1773 static int 1774 ffs_setextattr( 1775 struct vop_setextattr_args /* { 1776 IN struct vnode *a_vp; 1777 IN int a_attrnamespace; 1778 IN const char *a_name; 1779 INOUT struct uio *a_uio; 1780 IN struct ucred *a_cred; 1781 IN struct thread *a_td; 1782 } */ *ap) 1783 { 1784 struct vnode *vp; 1785 struct inode *ip; 1786 struct fs *fs; 1787 struct extattr *eap; 1788 uint32_t ealength, ul; 1789 ssize_t ealen; 1790 int olen, eapad1, eapad2, error, i, easize; 1791 u_char *eae; 1792 void *tmp; 1793 1794 vp = ap->a_vp; 1795 ip = VTOI(vp); 1796 fs = ITOFS(ip); 1797 1798 if (vp->v_type == VCHR || vp->v_type == VBLK) 1799 return (EOPNOTSUPP); 1800 if (strlen(ap->a_name) == 0) 1801 return (EINVAL); 1802 1803 /* XXX Now unsupported API to delete EAs using NULL uio. */ 1804 if (ap->a_uio == NULL) 1805 return (EOPNOTSUPP); 1806 1807 if (vp->v_mount->mnt_flag & MNT_RDONLY) 1808 return (EROFS); 1809 1810 ealen = ap->a_uio->uio_resid; 1811 if (ealen < 0 || ealen > lblktosize(fs, UFS_NXADDR)) 1812 return (EINVAL); 1813 1814 error = extattr_check_cred(vp, ap->a_attrnamespace, 1815 ap->a_cred, ap->a_td, VWRITE); 1816 if (error) { 1817 /* 1818 * ffs_lock_ea is not needed there, because the vnode 1819 * must be exclusively locked. 1820 */ 1821 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1822 ip->i_ea_error = error; 1823 return (error); 1824 } 1825 1826 if (DOINGSUJ(vp)) { 1827 ASSERT_VOP_ELOCKED(vp, "ffs_deleteextattr"); 1828 softdep_prealloc(vp, MNT_WAIT); 1829 if (vp->v_data == NULL) 1830 return (EBADF); 1831 } 1832 1833 error = ffs_open_ea(vp, ap->a_cred, ap->a_td); 1834 if (error) 1835 return (error); 1836 1837 ealength = sizeof(uint32_t) + 3 + strlen(ap->a_name); 1838 eapad1 = roundup2(ealength, 8) - ealength; 1839 eapad2 = roundup2(ealen, 8) - ealen; 1840 ealength += eapad1 + ealen + eapad2; 1841 1842 /* 1843 * CEM: rewrites of the same size or smaller could be done in-place 1844 * instead. (We don't acquire any fine-grained locks in here either, 1845 * so we could also do bigger writes in-place.) 1846 */ 1847 eae = malloc(ip->i_ea_len + ealength, M_TEMP, M_WAITOK); 1848 bcopy(ip->i_ea_area, eae, ip->i_ea_len); 1849 easize = ip->i_ea_len; 1850 1851 olen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name, 1852 &eap, NULL); 1853 if (olen == -1) { 1854 /* new, append at end */ 1855 KASSERT(ALIGNED_TO(eae + easize, struct extattr), 1856 ("unaligned")); 1857 eap = (struct extattr *)(eae + easize); 1858 easize += ealength; 1859 } else { 1860 ul = eap->ea_length; 1861 i = (u_char *)EXTATTR_NEXT(eap) - eae; 1862 if (ul != ealength) { 1863 bcopy(EXTATTR_NEXT(eap), (u_char *)eap + ealength, 1864 easize - i); 1865 easize += (ealength - ul); 1866 } 1867 } 1868 if (easize > lblktosize(fs, UFS_NXADDR)) { 1869 free(eae, M_TEMP); 1870 ffs_close_ea(vp, 0, ap->a_cred, ap->a_td); 1871 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1872 ip->i_ea_error = ENOSPC; 1873 return (ENOSPC); 1874 } 1875 eap->ea_length = ealength; 1876 eap->ea_namespace = ap->a_attrnamespace; 1877 eap->ea_contentpadlen = eapad2; 1878 eap->ea_namelength = strlen(ap->a_name); 1879 memcpy(eap->ea_name, ap->a_name, strlen(ap->a_name)); 1880 bzero(&eap->ea_name[strlen(ap->a_name)], eapad1); 1881 error = uiomove(EXTATTR_CONTENT(eap), ealen, ap->a_uio); 1882 if (error) { 1883 free(eae, M_TEMP); 1884 ffs_close_ea(vp, 0, ap->a_cred, ap->a_td); 1885 if (ip->i_ea_area != NULL && ip->i_ea_error == 0) 1886 ip->i_ea_error = error; 1887 return (error); 1888 } 1889 bzero((u_char *)EXTATTR_CONTENT(eap) + ealen, eapad2); 1890 1891 tmp = ip->i_ea_area; 1892 ip->i_ea_area = eae; 1893 ip->i_ea_len = easize; 1894 free(tmp, M_TEMP); 1895 error = ffs_close_ea(vp, 1, ap->a_cred, ap->a_td); 1896 return (error); 1897 } 1898 1899 /* 1900 * Vnode pointer to File handle 1901 */ 1902 static int 1903 ffs_vptofh( 1904 struct vop_vptofh_args /* { 1905 IN struct vnode *a_vp; 1906 IN struct fid *a_fhp; 1907 } */ *ap) 1908 { 1909 struct inode *ip; 1910 struct ufid *ufhp; 1911 1912 ip = VTOI(ap->a_vp); 1913 ufhp = (struct ufid *)ap->a_fhp; 1914 ufhp->ufid_len = sizeof(struct ufid); 1915 ufhp->ufid_ino = ip->i_number; 1916 ufhp->ufid_gen = ip->i_gen; 1917 return (0); 1918 } 1919 1920 SYSCTL_DECL(_vfs_ffs); 1921 static int use_buf_pager = 1; 1922 SYSCTL_INT(_vfs_ffs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, &use_buf_pager, 0, 1923 "Always use buffer pager instead of bmap"); 1924 1925 static daddr_t 1926 ffs_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 1927 { 1928 1929 return (lblkno(VFSTOUFS(vp->v_mount)->um_fs, off)); 1930 } 1931 1932 static int 1933 ffs_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz) 1934 { 1935 1936 *sz = blksize(VFSTOUFS(vp->v_mount)->um_fs, VTOI(vp), lbn); 1937 return (0); 1938 } 1939 1940 static int 1941 ffs_getpages(struct vop_getpages_args *ap) 1942 { 1943 struct vnode *vp; 1944 struct ufsmount *um; 1945 1946 vp = ap->a_vp; 1947 um = VFSTOUFS(vp->v_mount); 1948 1949 if (!use_buf_pager && um->um_devvp->v_bufobj.bo_bsize <= PAGE_SIZE) 1950 return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count, 1951 ap->a_rbehind, ap->a_rahead, NULL, NULL)); 1952 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind, 1953 ap->a_rahead, ffs_gbp_getblkno, ffs_gbp_getblksz)); 1954 } 1955 1956 static int 1957 ffs_getpages_async(struct vop_getpages_async_args *ap) 1958 { 1959 struct vnode *vp; 1960 struct ufsmount *um; 1961 bool do_iodone; 1962 int error; 1963 1964 vp = ap->a_vp; 1965 um = VFSTOUFS(vp->v_mount); 1966 do_iodone = true; 1967 1968 if (um->um_devvp->v_bufobj.bo_bsize <= PAGE_SIZE) { 1969 error = vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count, 1970 ap->a_rbehind, ap->a_rahead, ap->a_iodone, ap->a_arg); 1971 if (error == 0) 1972 do_iodone = false; 1973 } else { 1974 error = vfs_bio_getpages(vp, ap->a_m, ap->a_count, 1975 ap->a_rbehind, ap->a_rahead, ffs_gbp_getblkno, 1976 ffs_gbp_getblksz); 1977 } 1978 if (do_iodone && ap->a_iodone != NULL) 1979 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error); 1980 1981 return (error); 1982 } 1983 1984 static int 1985 ffs_vput_pair(struct vop_vput_pair_args *ap) 1986 { 1987 struct mount *mp; 1988 struct vnode *dvp, *vp, *vp1, **vpp; 1989 struct inode *dp, *ip; 1990 ino_t ip_ino; 1991 u_int64_t ip_gen; 1992 int error, vp_locked; 1993 1994 dvp = ap->a_dvp; 1995 dp = VTOI(dvp); 1996 vpp = ap->a_vpp; 1997 vp = vpp != NULL ? *vpp : NULL; 1998 1999 if ((dp->i_flag & (IN_NEEDSYNC | IN_ENDOFF)) == 0) { 2000 vput(dvp); 2001 if (vp != NULL && ap->a_unlock_vp) 2002 vput(vp); 2003 return (0); 2004 } 2005 2006 mp = dvp->v_mount; 2007 if (vp != NULL) { 2008 if (ap->a_unlock_vp) { 2009 vput(vp); 2010 } else { 2011 MPASS(vp->v_type != VNON); 2012 vp_locked = VOP_ISLOCKED(vp); 2013 ip = VTOI(vp); 2014 ip_ino = ip->i_number; 2015 ip_gen = ip->i_gen; 2016 VOP_UNLOCK(vp); 2017 } 2018 } 2019 2020 /* 2021 * If compaction or fsync was requested do it in ffs_vput_pair() 2022 * now that other locks are no longer held. 2023 */ 2024 if ((dp->i_flag & IN_ENDOFF) != 0) { 2025 VNASSERT(I_ENDOFF(dp) != 0 && I_ENDOFF(dp) < dp->i_size, dvp, 2026 ("IN_ENDOFF set but I_ENDOFF() is not")); 2027 dp->i_flag &= ~IN_ENDOFF; 2028 error = UFS_TRUNCATE(dvp, (off_t)I_ENDOFF(dp), IO_NORMAL | 2029 (DOINGASYNC(dvp) ? 0 : IO_SYNC), curthread->td_ucred); 2030 if (error != 0 && error != ERELOOKUP) { 2031 if (!ffs_fsfail_cleanup(VFSTOUFS(mp), error)) { 2032 vn_printf(dvp, 2033 "IN_ENDOFF: failed to truncate, " 2034 "error %d\n", error); 2035 } 2036 #ifdef UFS_DIRHASH 2037 ufsdirhash_free(dp); 2038 #endif 2039 } 2040 SET_I_ENDOFF(dp, 0); 2041 } 2042 if ((dp->i_flag & IN_NEEDSYNC) != 0) { 2043 do { 2044 error = ffs_syncvnode(dvp, MNT_WAIT, 0); 2045 } while (error == ERELOOKUP); 2046 } 2047 2048 vput(dvp); 2049 2050 if (vp == NULL || ap->a_unlock_vp) 2051 return (0); 2052 MPASS(mp != NULL); 2053 2054 /* 2055 * It is possible that vp is reclaimed at this point. Only 2056 * routines that call us with a_unlock_vp == false can find 2057 * that their vp has been reclaimed. There are three areas 2058 * that are affected: 2059 * 1) vn_open_cred() - later VOPs could fail, but 2060 * dead_open() returns 0 to simulate successful open. 2061 * 2) ffs_snapshot() - creation of snapshot fails with EBADF. 2062 * 3) NFS server (several places) - code is prepared to detect 2063 * and respond to dead vnodes by returning ESTALE. 2064 */ 2065 VOP_LOCK(vp, vp_locked | LK_RETRY); 2066 if (IS_UFS(vp)) 2067 return (0); 2068 2069 /* 2070 * Try harder to recover from reclaimed vp if reclaim was not 2071 * because underlying inode was cleared. We saved inode 2072 * number and inode generation, so we can try to reinstantiate 2073 * exactly same version of inode. If this fails, return 2074 * original doomed vnode and let caller to handle 2075 * consequences. 2076 * 2077 * Note that callers must keep write started around 2078 * VOP_VPUT_PAIR() calls, so it is safe to use mp without 2079 * busying it. 2080 */ 2081 VOP_UNLOCK(vp); 2082 error = ffs_inotovp(mp, ip_ino, ip_gen, LK_EXCLUSIVE, &vp1, 2083 FFSV_REPLACE_DOOMED); 2084 if (error != 0) { 2085 VOP_LOCK(vp, vp_locked | LK_RETRY); 2086 } else { 2087 vrele(vp); 2088 *vpp = vp1; 2089 } 2090 return (error); 2091 }
Cache object: bc1b17d2270b54f6d6d1aaa8eb23e23b
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