zfs_vnops.c revision 262112
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2013 by Delphix. All rights reserved. 24 * Copyright 2013 Nexenta Systems, Inc. All rights reserved. 25 */ 26 27/* Portions Copyright 2007 Jeremy Teo */ 28/* Portions Copyright 2010 Robert Milkowski */ 29 30#include <sys/types.h> 31#include <sys/param.h> 32#include <sys/time.h> 33#include <sys/systm.h> 34#include <sys/sysmacros.h> 35#include <sys/resource.h> 36#include <sys/vfs.h> 37#include <sys/vm.h> 38#include <sys/vnode.h> 39#include <sys/file.h> 40#include <sys/stat.h> 41#include <sys/kmem.h> 42#include <sys/taskq.h> 43#include <sys/uio.h> 44#include <sys/atomic.h> 45#include <sys/namei.h> 46#include <sys/mman.h> 47#include <sys/cmn_err.h> 48#include <sys/errno.h> 49#include <sys/unistd.h> 50#include <sys/zfs_dir.h> 51#include <sys/zfs_ioctl.h> 52#include <sys/fs/zfs.h> 53#include <sys/dmu.h> 54#include <sys/dmu_objset.h> 55#include <sys/spa.h> 56#include <sys/txg.h> 57#include <sys/dbuf.h> 58#include <sys/zap.h> 59#include <sys/sa.h> 60#include <sys/dirent.h> 61#include <sys/policy.h> 62#include <sys/sunddi.h> 63#include <sys/filio.h> 64#include <sys/sid.h> 65#include <sys/zfs_ctldir.h> 66#include <sys/zfs_fuid.h> 67#include <sys/zfs_sa.h> 68#include <sys/dnlc.h> 69#include <sys/zfs_rlock.h> 70#include <sys/extdirent.h> 71#include <sys/kidmap.h> 72#include <sys/bio.h> 73#include <sys/buf.h> 74#include <sys/sched.h> 75#include <sys/acl.h> 76#include <vm/vm_param.h> 77#include <vm/vm_pageout.h> 78 79/* 80 * Programming rules. 81 * 82 * Each vnode op performs some logical unit of work. To do this, the ZPL must 83 * properly lock its in-core state, create a DMU transaction, do the work, 84 * record this work in the intent log (ZIL), commit the DMU transaction, 85 * and wait for the intent log to commit if it is a synchronous operation. 86 * Moreover, the vnode ops must work in both normal and log replay context. 87 * The ordering of events is important to avoid deadlocks and references 88 * to freed memory. The example below illustrates the following Big Rules: 89 * 90 * (1) A check must be made in each zfs thread for a mounted file system. 91 * This is done avoiding races using ZFS_ENTER(zfsvfs). 92 * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes 93 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros 94 * can return EIO from the calling function. 95 * 96 * (2) VN_RELE() should always be the last thing except for zil_commit() 97 * (if necessary) and ZFS_EXIT(). This is for 3 reasons: 98 * First, if it's the last reference, the vnode/znode 99 * can be freed, so the zp may point to freed memory. Second, the last 100 * reference will call zfs_zinactive(), which may induce a lot of work -- 101 * pushing cached pages (which acquires range locks) and syncing out 102 * cached atime changes. Third, zfs_zinactive() may require a new tx, 103 * which could deadlock the system if you were already holding one. 104 * If you must call VN_RELE() within a tx then use VN_RELE_ASYNC(). 105 * 106 * (3) All range locks must be grabbed before calling dmu_tx_assign(), 107 * as they can span dmu_tx_assign() calls. 108 * 109 * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to 110 * dmu_tx_assign(). This is critical because we don't want to block 111 * while holding locks. 112 * 113 * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This 114 * reduces lock contention and CPU usage when we must wait (note that if 115 * throughput is constrained by the storage, nearly every transaction 116 * must wait). 117 * 118 * Note, in particular, that if a lock is sometimes acquired before 119 * the tx assigns, and sometimes after (e.g. z_lock), then failing 120 * to use a non-blocking assign can deadlock the system. The scenario: 121 * 122 * Thread A has grabbed a lock before calling dmu_tx_assign(). 123 * Thread B is in an already-assigned tx, and blocks for this lock. 124 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open() 125 * forever, because the previous txg can't quiesce until B's tx commits. 126 * 127 * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT, 128 * then drop all locks, call dmu_tx_wait(), and try again. On subsequent 129 * calls to dmu_tx_assign(), pass TXG_WAITED rather than TXG_NOWAIT, 130 * to indicate that this operation has already called dmu_tx_wait(). 131 * This will ensure that we don't retry forever, waiting a short bit 132 * each time. 133 * 134 * (5) If the operation succeeded, generate the intent log entry for it 135 * before dropping locks. This ensures that the ordering of events 136 * in the intent log matches the order in which they actually occurred. 137 * During ZIL replay the zfs_log_* functions will update the sequence 138 * number to indicate the zil transaction has replayed. 139 * 140 * (6) At the end of each vnode op, the DMU tx must always commit, 141 * regardless of whether there were any errors. 142 * 143 * (7) After dropping all locks, invoke zil_commit(zilog, foid) 144 * to ensure that synchronous semantics are provided when necessary. 145 * 146 * In general, this is how things should be ordered in each vnode op: 147 * 148 * ZFS_ENTER(zfsvfs); // exit if unmounted 149 * top: 150 * zfs_dirent_lock(&dl, ...) // lock directory entry (may VN_HOLD()) 151 * rw_enter(...); // grab any other locks you need 152 * tx = dmu_tx_create(...); // get DMU tx 153 * dmu_tx_hold_*(); // hold each object you might modify 154 * error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 155 * if (error) { 156 * rw_exit(...); // drop locks 157 * zfs_dirent_unlock(dl); // unlock directory entry 158 * VN_RELE(...); // release held vnodes 159 * if (error == ERESTART) { 160 * waited = B_TRUE; 161 * dmu_tx_wait(tx); 162 * dmu_tx_abort(tx); 163 * goto top; 164 * } 165 * dmu_tx_abort(tx); // abort DMU tx 166 * ZFS_EXIT(zfsvfs); // finished in zfs 167 * return (error); // really out of space 168 * } 169 * error = do_real_work(); // do whatever this VOP does 170 * if (error == 0) 171 * zfs_log_*(...); // on success, make ZIL entry 172 * dmu_tx_commit(tx); // commit DMU tx -- error or not 173 * rw_exit(...); // drop locks 174 * zfs_dirent_unlock(dl); // unlock directory entry 175 * VN_RELE(...); // release held vnodes 176 * zil_commit(zilog, foid); // synchronous when necessary 177 * ZFS_EXIT(zfsvfs); // finished in zfs 178 * return (error); // done, report error 179 */ 180 181/* ARGSUSED */ 182static int 183zfs_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct) 184{ 185 znode_t *zp = VTOZ(*vpp); 186 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 187 188 ZFS_ENTER(zfsvfs); 189 ZFS_VERIFY_ZP(zp); 190 191 if ((flag & FWRITE) && (zp->z_pflags & ZFS_APPENDONLY) && 192 ((flag & FAPPEND) == 0)) { 193 ZFS_EXIT(zfsvfs); 194 return (SET_ERROR(EPERM)); 195 } 196 197 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan && 198 ZTOV(zp)->v_type == VREG && 199 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) { 200 if (fs_vscan(*vpp, cr, 0) != 0) { 201 ZFS_EXIT(zfsvfs); 202 return (SET_ERROR(EACCES)); 203 } 204 } 205 206 /* Keep a count of the synchronous opens in the znode */ 207 if (flag & (FSYNC | FDSYNC)) 208 atomic_inc_32(&zp->z_sync_cnt); 209 210 ZFS_EXIT(zfsvfs); 211 return (0); 212} 213 214/* ARGSUSED */ 215static int 216zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr, 217 caller_context_t *ct) 218{ 219 znode_t *zp = VTOZ(vp); 220 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 221 222 /* 223 * Clean up any locks held by this process on the vp. 224 */ 225 cleanlocks(vp, ddi_get_pid(), 0); 226 cleanshares(vp, ddi_get_pid()); 227 228 ZFS_ENTER(zfsvfs); 229 ZFS_VERIFY_ZP(zp); 230 231 /* Decrement the synchronous opens in the znode */ 232 if ((flag & (FSYNC | FDSYNC)) && (count == 1)) 233 atomic_dec_32(&zp->z_sync_cnt); 234 235 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan && 236 ZTOV(zp)->v_type == VREG && 237 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) 238 VERIFY(fs_vscan(vp, cr, 1) == 0); 239 240 ZFS_EXIT(zfsvfs); 241 return (0); 242} 243 244/* 245 * Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and 246 * data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter. 247 */ 248static int 249zfs_holey(vnode_t *vp, u_long cmd, offset_t *off) 250{ 251 znode_t *zp = VTOZ(vp); 252 uint64_t noff = (uint64_t)*off; /* new offset */ 253 uint64_t file_sz; 254 int error; 255 boolean_t hole; 256 257 file_sz = zp->z_size; 258 if (noff >= file_sz) { 259 return (SET_ERROR(ENXIO)); 260 } 261 262 if (cmd == _FIO_SEEK_HOLE) 263 hole = B_TRUE; 264 else 265 hole = B_FALSE; 266 267 error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff); 268 269 /* end of file? */ 270 if ((error == ESRCH) || (noff > file_sz)) { 271 /* 272 * Handle the virtual hole at the end of file. 273 */ 274 if (hole) { 275 *off = file_sz; 276 return (0); 277 } 278 return (SET_ERROR(ENXIO)); 279 } 280 281 if (noff < *off) 282 return (error); 283 *off = noff; 284 return (error); 285} 286 287/* ARGSUSED */ 288static int 289zfs_ioctl(vnode_t *vp, u_long com, intptr_t data, int flag, cred_t *cred, 290 int *rvalp, caller_context_t *ct) 291{ 292 offset_t off; 293 int error; 294 zfsvfs_t *zfsvfs; 295 znode_t *zp; 296 297 switch (com) { 298 case _FIOFFS: 299 return (0); 300 301 /* 302 * The following two ioctls are used by bfu. Faking out, 303 * necessary to avoid bfu errors. 304 */ 305 case _FIOGDIO: 306 case _FIOSDIO: 307 return (0); 308 309 case _FIO_SEEK_DATA: 310 case _FIO_SEEK_HOLE: 311#ifdef sun 312 if (ddi_copyin((void *)data, &off, sizeof (off), flag)) 313 return (SET_ERROR(EFAULT)); 314#else 315 off = *(offset_t *)data; 316#endif 317 zp = VTOZ(vp); 318 zfsvfs = zp->z_zfsvfs; 319 ZFS_ENTER(zfsvfs); 320 ZFS_VERIFY_ZP(zp); 321 322 /* offset parameter is in/out */ 323 error = zfs_holey(vp, com, &off); 324 ZFS_EXIT(zfsvfs); 325 if (error) 326 return (error); 327#ifdef sun 328 if (ddi_copyout(&off, (void *)data, sizeof (off), flag)) 329 return (SET_ERROR(EFAULT)); 330#else 331 *(offset_t *)data = off; 332#endif 333 return (0); 334 } 335 return (SET_ERROR(ENOTTY)); 336} 337 338static vm_page_t 339page_busy(vnode_t *vp, int64_t start, int64_t off, int64_t nbytes) 340{ 341 vm_object_t obj; 342 vm_page_t pp; 343 int64_t end; 344 345 /* 346 * At present vm_page_clear_dirty extends the cleared range to DEV_BSIZE 347 * aligned boundaries, if the range is not aligned. As a result a 348 * DEV_BSIZE subrange with partially dirty data may get marked as clean. 349 * It may happen that all DEV_BSIZE subranges are marked clean and thus 350 * the whole page would be considred clean despite have some dirty data. 351 * For this reason we should shrink the range to DEV_BSIZE aligned 352 * boundaries before calling vm_page_clear_dirty. 353 */ 354 end = rounddown2(off + nbytes, DEV_BSIZE); 355 off = roundup2(off, DEV_BSIZE); 356 nbytes = end - off; 357 358 obj = vp->v_object; 359 zfs_vmobject_assert_wlocked(obj); 360 361 for (;;) { 362 if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL && 363 pp->valid) { 364 if (vm_page_xbusied(pp)) { 365 /* 366 * Reference the page before unlocking and 367 * sleeping so that the page daemon is less 368 * likely to reclaim it. 369 */ 370 vm_page_reference(pp); 371 vm_page_lock(pp); 372 zfs_vmobject_wunlock(obj); 373 vm_page_busy_sleep(pp, "zfsmwb"); 374 zfs_vmobject_wlock(obj); 375 continue; 376 } 377 vm_page_sbusy(pp); 378 } else if (pp == NULL) { 379 pp = vm_page_alloc(obj, OFF_TO_IDX(start), 380 VM_ALLOC_SYSTEM | VM_ALLOC_IFCACHED | 381 VM_ALLOC_SBUSY); 382 } else { 383 ASSERT(pp != NULL && !pp->valid); 384 pp = NULL; 385 } 386 387 if (pp != NULL) { 388 ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL); 389 vm_object_pip_add(obj, 1); 390 pmap_remove_write(pp); 391 if (nbytes != 0) 392 vm_page_clear_dirty(pp, off, nbytes); 393 } 394 break; 395 } 396 return (pp); 397} 398 399static void 400page_unbusy(vm_page_t pp) 401{ 402 403 vm_page_sunbusy(pp); 404 vm_object_pip_subtract(pp->object, 1); 405} 406 407static vm_page_t 408page_hold(vnode_t *vp, int64_t start) 409{ 410 vm_object_t obj; 411 vm_page_t pp; 412 413 obj = vp->v_object; 414 zfs_vmobject_assert_wlocked(obj); 415 416 for (;;) { 417 if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL && 418 pp->valid) { 419 if (vm_page_xbusied(pp)) { 420 /* 421 * Reference the page before unlocking and 422 * sleeping so that the page daemon is less 423 * likely to reclaim it. 424 */ 425 vm_page_reference(pp); 426 vm_page_lock(pp); 427 zfs_vmobject_wunlock(obj); 428 vm_page_busy_sleep(pp, "zfsmwb"); 429 zfs_vmobject_wlock(obj); 430 continue; 431 } 432 433 ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL); 434 vm_page_lock(pp); 435 vm_page_hold(pp); 436 vm_page_unlock(pp); 437 438 } else 439 pp = NULL; 440 break; 441 } 442 return (pp); 443} 444 445static void 446page_unhold(vm_page_t pp) 447{ 448 449 vm_page_lock(pp); 450 vm_page_unhold(pp); 451 vm_page_unlock(pp); 452} 453 454/* 455 * When a file is memory mapped, we must keep the IO data synchronized 456 * between the DMU cache and the memory mapped pages. What this means: 457 * 458 * On Write: If we find a memory mapped page, we write to *both* 459 * the page and the dmu buffer. 460 */ 461static void 462update_pages(vnode_t *vp, int64_t start, int len, objset_t *os, uint64_t oid, 463 int segflg, dmu_tx_t *tx) 464{ 465 vm_object_t obj; 466 struct sf_buf *sf; 467 caddr_t va; 468 int off; 469 470 ASSERT(segflg != UIO_NOCOPY); 471 ASSERT(vp->v_mount != NULL); 472 obj = vp->v_object; 473 ASSERT(obj != NULL); 474 475 off = start & PAGEOFFSET; 476 zfs_vmobject_wlock(obj); 477 for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 478 vm_page_t pp; 479 int nbytes = imin(PAGESIZE - off, len); 480 481 if ((pp = page_busy(vp, start, off, nbytes)) != NULL) { 482 zfs_vmobject_wunlock(obj); 483 484 va = zfs_map_page(pp, &sf); 485 (void) dmu_read(os, oid, start+off, nbytes, 486 va+off, DMU_READ_PREFETCH);; 487 zfs_unmap_page(sf); 488 489 zfs_vmobject_wlock(obj); 490 page_unbusy(pp); 491 } 492 len -= nbytes; 493 off = 0; 494 } 495 vm_object_pip_wakeupn(obj, 0); 496 zfs_vmobject_wunlock(obj); 497} 498 499/* 500 * Read with UIO_NOCOPY flag means that sendfile(2) requests 501 * ZFS to populate a range of page cache pages with data. 502 * 503 * NOTE: this function could be optimized to pre-allocate 504 * all pages in advance, drain exclusive busy on all of them, 505 * map them into contiguous KVA region and populate them 506 * in one single dmu_read() call. 507 */ 508static int 509mappedread_sf(vnode_t *vp, int nbytes, uio_t *uio) 510{ 511 znode_t *zp = VTOZ(vp); 512 objset_t *os = zp->z_zfsvfs->z_os; 513 struct sf_buf *sf; 514 vm_object_t obj; 515 vm_page_t pp; 516 int64_t start; 517 caddr_t va; 518 int len = nbytes; 519 int off; 520 int error = 0; 521 522 ASSERT(uio->uio_segflg == UIO_NOCOPY); 523 ASSERT(vp->v_mount != NULL); 524 obj = vp->v_object; 525 ASSERT(obj != NULL); 526 ASSERT((uio->uio_loffset & PAGEOFFSET) == 0); 527 528 zfs_vmobject_wlock(obj); 529 for (start = uio->uio_loffset; len > 0; start += PAGESIZE) { 530 int bytes = MIN(PAGESIZE, len); 531 532 pp = vm_page_grab(obj, OFF_TO_IDX(start), VM_ALLOC_SBUSY | 533 VM_ALLOC_NORMAL | VM_ALLOC_IGN_SBUSY); 534 if (pp->valid == 0) { 535 zfs_vmobject_wunlock(obj); 536 va = zfs_map_page(pp, &sf); 537 error = dmu_read(os, zp->z_id, start, bytes, va, 538 DMU_READ_PREFETCH); 539 if (bytes != PAGESIZE && error == 0) 540 bzero(va + bytes, PAGESIZE - bytes); 541 zfs_unmap_page(sf); 542 zfs_vmobject_wlock(obj); 543 vm_page_sunbusy(pp); 544 vm_page_lock(pp); 545 if (error) { 546 if (pp->wire_count == 0 && pp->valid == 0 && 547 !vm_page_busied(pp)) 548 vm_page_free(pp); 549 } else { 550 pp->valid = VM_PAGE_BITS_ALL; 551 vm_page_activate(pp); 552 } 553 vm_page_unlock(pp); 554 } else { 555 ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL); 556 vm_page_sunbusy(pp); 557 } 558 if (error) 559 break; 560 uio->uio_resid -= bytes; 561 uio->uio_offset += bytes; 562 len -= bytes; 563 } 564 zfs_vmobject_wunlock(obj); 565 return (error); 566} 567 568/* 569 * When a file is memory mapped, we must keep the IO data synchronized 570 * between the DMU cache and the memory mapped pages. What this means: 571 * 572 * On Read: We "read" preferentially from memory mapped pages, 573 * else we default from the dmu buffer. 574 * 575 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when 576 * the file is memory mapped. 577 */ 578static int 579mappedread(vnode_t *vp, int nbytes, uio_t *uio) 580{ 581 znode_t *zp = VTOZ(vp); 582 objset_t *os = zp->z_zfsvfs->z_os; 583 vm_object_t obj; 584 int64_t start; 585 caddr_t va; 586 int len = nbytes; 587 int off; 588 int error = 0; 589 590 ASSERT(vp->v_mount != NULL); 591 obj = vp->v_object; 592 ASSERT(obj != NULL); 593 594 start = uio->uio_loffset; 595 off = start & PAGEOFFSET; 596 zfs_vmobject_wlock(obj); 597 for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 598 vm_page_t pp; 599 uint64_t bytes = MIN(PAGESIZE - off, len); 600 601 if (pp = page_hold(vp, start)) { 602 struct sf_buf *sf; 603 caddr_t va; 604 605 zfs_vmobject_wunlock(obj); 606 va = zfs_map_page(pp, &sf); 607 error = uiomove(va + off, bytes, UIO_READ, uio); 608 zfs_unmap_page(sf); 609 zfs_vmobject_wlock(obj); 610 page_unhold(pp); 611 } else { 612 zfs_vmobject_wunlock(obj); 613 error = dmu_read_uio(os, zp->z_id, uio, bytes); 614 zfs_vmobject_wlock(obj); 615 } 616 len -= bytes; 617 off = 0; 618 if (error) 619 break; 620 } 621 zfs_vmobject_wunlock(obj); 622 return (error); 623} 624 625offset_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */ 626 627/* 628 * Read bytes from specified file into supplied buffer. 629 * 630 * IN: vp - vnode of file to be read from. 631 * uio - structure supplying read location, range info, 632 * and return buffer. 633 * ioflag - SYNC flags; used to provide FRSYNC semantics. 634 * cr - credentials of caller. 635 * ct - caller context 636 * 637 * OUT: uio - updated offset and range, buffer filled. 638 * 639 * RETURN: 0 on success, error code on failure. 640 * 641 * Side Effects: 642 * vp - atime updated if byte count > 0 643 */ 644/* ARGSUSED */ 645static int 646zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 647{ 648 znode_t *zp = VTOZ(vp); 649 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 650 objset_t *os; 651 ssize_t n, nbytes; 652 int error = 0; 653 rl_t *rl; 654 xuio_t *xuio = NULL; 655 656 ZFS_ENTER(zfsvfs); 657 ZFS_VERIFY_ZP(zp); 658 os = zfsvfs->z_os; 659 660 if (zp->z_pflags & ZFS_AV_QUARANTINED) { 661 ZFS_EXIT(zfsvfs); 662 return (SET_ERROR(EACCES)); 663 } 664 665 /* 666 * Validate file offset 667 */ 668 if (uio->uio_loffset < (offset_t)0) { 669 ZFS_EXIT(zfsvfs); 670 return (SET_ERROR(EINVAL)); 671 } 672 673 /* 674 * Fasttrack empty reads 675 */ 676 if (uio->uio_resid == 0) { 677 ZFS_EXIT(zfsvfs); 678 return (0); 679 } 680 681 /* 682 * Check for mandatory locks 683 */ 684 if (MANDMODE(zp->z_mode)) { 685 if (error = chklock(vp, FREAD, 686 uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) { 687 ZFS_EXIT(zfsvfs); 688 return (error); 689 } 690 } 691 692 /* 693 * If we're in FRSYNC mode, sync out this znode before reading it. 694 */ 695 if (zfsvfs->z_log && 696 (ioflag & FRSYNC || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)) 697 zil_commit(zfsvfs->z_log, zp->z_id); 698 699 /* 700 * Lock the range against changes. 701 */ 702 rl = zfs_range_lock(zp, uio->uio_loffset, uio->uio_resid, RL_READER); 703 704 /* 705 * If we are reading past end-of-file we can skip 706 * to the end; but we might still need to set atime. 707 */ 708 if (uio->uio_loffset >= zp->z_size) { 709 error = 0; 710 goto out; 711 } 712 713 ASSERT(uio->uio_loffset < zp->z_size); 714 n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset); 715 716#ifdef sun 717 if ((uio->uio_extflg == UIO_XUIO) && 718 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) { 719 int nblk; 720 int blksz = zp->z_blksz; 721 uint64_t offset = uio->uio_loffset; 722 723 xuio = (xuio_t *)uio; 724 if ((ISP2(blksz))) { 725 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset, 726 blksz)) / blksz; 727 } else { 728 ASSERT(offset + n <= blksz); 729 nblk = 1; 730 } 731 (void) dmu_xuio_init(xuio, nblk); 732 733 if (vn_has_cached_data(vp)) { 734 /* 735 * For simplicity, we always allocate a full buffer 736 * even if we only expect to read a portion of a block. 737 */ 738 while (--nblk >= 0) { 739 (void) dmu_xuio_add(xuio, 740 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 741 blksz), 0, blksz); 742 } 743 } 744 } 745#endif /* sun */ 746 747 while (n > 0) { 748 nbytes = MIN(n, zfs_read_chunk_size - 749 P2PHASE(uio->uio_loffset, zfs_read_chunk_size)); 750 751#ifdef __FreeBSD__ 752 if (uio->uio_segflg == UIO_NOCOPY) 753 error = mappedread_sf(vp, nbytes, uio); 754 else 755#endif /* __FreeBSD__ */ 756 if (vn_has_cached_data(vp)) 757 error = mappedread(vp, nbytes, uio); 758 else 759 error = dmu_read_uio(os, zp->z_id, uio, nbytes); 760 if (error) { 761 /* convert checksum errors into IO errors */ 762 if (error == ECKSUM) 763 error = SET_ERROR(EIO); 764 break; 765 } 766 767 n -= nbytes; 768 } 769out: 770 zfs_range_unlock(rl); 771 772 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 773 ZFS_EXIT(zfsvfs); 774 return (error); 775} 776 777/* 778 * Write the bytes to a file. 779 * 780 * IN: vp - vnode of file to be written to. 781 * uio - structure supplying write location, range info, 782 * and data buffer. 783 * ioflag - FAPPEND, FSYNC, and/or FDSYNC. FAPPEND is 784 * set if in append mode. 785 * cr - credentials of caller. 786 * ct - caller context (NFS/CIFS fem monitor only) 787 * 788 * OUT: uio - updated offset and range. 789 * 790 * RETURN: 0 on success, error code on failure. 791 * 792 * Timestamps: 793 * vp - ctime|mtime updated if byte count > 0 794 */ 795 796/* ARGSUSED */ 797static int 798zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 799{ 800 znode_t *zp = VTOZ(vp); 801 rlim64_t limit = MAXOFFSET_T; 802 ssize_t start_resid = uio->uio_resid; 803 ssize_t tx_bytes; 804 uint64_t end_size; 805 dmu_tx_t *tx; 806 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 807 zilog_t *zilog; 808 offset_t woff; 809 ssize_t n, nbytes; 810 rl_t *rl; 811 int max_blksz = zfsvfs->z_max_blksz; 812 int error = 0; 813 arc_buf_t *abuf; 814 iovec_t *aiov = NULL; 815 xuio_t *xuio = NULL; 816 int i_iov = 0; 817 int iovcnt = uio->uio_iovcnt; 818 iovec_t *iovp = uio->uio_iov; 819 int write_eof; 820 int count = 0; 821 sa_bulk_attr_t bulk[4]; 822 uint64_t mtime[2], ctime[2]; 823 824 /* 825 * Fasttrack empty write 826 */ 827 n = start_resid; 828 if (n == 0) 829 return (0); 830 831 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T) 832 limit = MAXOFFSET_T; 833 834 ZFS_ENTER(zfsvfs); 835 ZFS_VERIFY_ZP(zp); 836 837 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); 838 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); 839 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 840 &zp->z_size, 8); 841 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 842 &zp->z_pflags, 8); 843 844 /* 845 * If immutable or not appending then return EPERM 846 */ 847 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) || 848 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) && 849 (uio->uio_loffset < zp->z_size))) { 850 ZFS_EXIT(zfsvfs); 851 return (SET_ERROR(EPERM)); 852 } 853 854 zilog = zfsvfs->z_log; 855 856 /* 857 * Validate file offset 858 */ 859 woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset; 860 if (woff < 0) { 861 ZFS_EXIT(zfsvfs); 862 return (SET_ERROR(EINVAL)); 863 } 864 865 /* 866 * Check for mandatory locks before calling zfs_range_lock() 867 * in order to prevent a deadlock with locks set via fcntl(). 868 */ 869 if (MANDMODE((mode_t)zp->z_mode) && 870 (error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) { 871 ZFS_EXIT(zfsvfs); 872 return (error); 873 } 874 875#ifdef sun 876 /* 877 * Pre-fault the pages to ensure slow (eg NFS) pages 878 * don't hold up txg. 879 * Skip this if uio contains loaned arc_buf. 880 */ 881 if ((uio->uio_extflg == UIO_XUIO) && 882 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) 883 xuio = (xuio_t *)uio; 884 else 885 uio_prefaultpages(MIN(n, max_blksz), uio); 886#endif /* sun */ 887 888 /* 889 * If in append mode, set the io offset pointer to eof. 890 */ 891 if (ioflag & FAPPEND) { 892 /* 893 * Obtain an appending range lock to guarantee file append 894 * semantics. We reset the write offset once we have the lock. 895 */ 896 rl = zfs_range_lock(zp, 0, n, RL_APPEND); 897 woff = rl->r_off; 898 if (rl->r_len == UINT64_MAX) { 899 /* 900 * We overlocked the file because this write will cause 901 * the file block size to increase. 902 * Note that zp_size cannot change with this lock held. 903 */ 904 woff = zp->z_size; 905 } 906 uio->uio_loffset = woff; 907 } else { 908 /* 909 * Note that if the file block size will change as a result of 910 * this write, then this range lock will lock the entire file 911 * so that we can re-write the block safely. 912 */ 913 rl = zfs_range_lock(zp, woff, n, RL_WRITER); 914 } 915 916 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) { 917 zfs_range_unlock(rl); 918 ZFS_EXIT(zfsvfs); 919 return (EFBIG); 920 } 921 922 if (woff >= limit) { 923 zfs_range_unlock(rl); 924 ZFS_EXIT(zfsvfs); 925 return (SET_ERROR(EFBIG)); 926 } 927 928 if ((woff + n) > limit || woff > (limit - n)) 929 n = limit - woff; 930 931 /* Will this write extend the file length? */ 932 write_eof = (woff + n > zp->z_size); 933 934 end_size = MAX(zp->z_size, woff + n); 935 936 /* 937 * Write the file in reasonable size chunks. Each chunk is written 938 * in a separate transaction; this keeps the intent log records small 939 * and allows us to do more fine-grained space accounting. 940 */ 941 while (n > 0) { 942 abuf = NULL; 943 woff = uio->uio_loffset; 944 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 945 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 946 if (abuf != NULL) 947 dmu_return_arcbuf(abuf); 948 error = SET_ERROR(EDQUOT); 949 break; 950 } 951 952 if (xuio && abuf == NULL) { 953 ASSERT(i_iov < iovcnt); 954 aiov = &iovp[i_iov]; 955 abuf = dmu_xuio_arcbuf(xuio, i_iov); 956 dmu_xuio_clear(xuio, i_iov); 957 DTRACE_PROBE3(zfs_cp_write, int, i_iov, 958 iovec_t *, aiov, arc_buf_t *, abuf); 959 ASSERT((aiov->iov_base == abuf->b_data) || 960 ((char *)aiov->iov_base - (char *)abuf->b_data + 961 aiov->iov_len == arc_buf_size(abuf))); 962 i_iov++; 963 } else if (abuf == NULL && n >= max_blksz && 964 woff >= zp->z_size && 965 P2PHASE(woff, max_blksz) == 0 && 966 zp->z_blksz == max_blksz) { 967 /* 968 * This write covers a full block. "Borrow" a buffer 969 * from the dmu so that we can fill it before we enter 970 * a transaction. This avoids the possibility of 971 * holding up the transaction if the data copy hangs 972 * up on a pagefault (e.g., from an NFS server mapping). 973 */ 974 size_t cbytes; 975 976 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 977 max_blksz); 978 ASSERT(abuf != NULL); 979 ASSERT(arc_buf_size(abuf) == max_blksz); 980 if (error = uiocopy(abuf->b_data, max_blksz, 981 UIO_WRITE, uio, &cbytes)) { 982 dmu_return_arcbuf(abuf); 983 break; 984 } 985 ASSERT(cbytes == max_blksz); 986 } 987 988 /* 989 * Start a transaction. 990 */ 991 tx = dmu_tx_create(zfsvfs->z_os); 992 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 993 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz)); 994 zfs_sa_upgrade_txholds(tx, zp); 995 error = dmu_tx_assign(tx, TXG_WAIT); 996 if (error) { 997 dmu_tx_abort(tx); 998 if (abuf != NULL) 999 dmu_return_arcbuf(abuf); 1000 break; 1001 } 1002 1003 /* 1004 * If zfs_range_lock() over-locked we grow the blocksize 1005 * and then reduce the lock range. This will only happen 1006 * on the first iteration since zfs_range_reduce() will 1007 * shrink down r_len to the appropriate size. 1008 */ 1009 if (rl->r_len == UINT64_MAX) { 1010 uint64_t new_blksz; 1011 1012 if (zp->z_blksz > max_blksz) { 1013 ASSERT(!ISP2(zp->z_blksz)); 1014 new_blksz = MIN(end_size, SPA_MAXBLOCKSIZE); 1015 } else { 1016 new_blksz = MIN(end_size, max_blksz); 1017 } 1018 zfs_grow_blocksize(zp, new_blksz, tx); 1019 zfs_range_reduce(rl, woff, n); 1020 } 1021 1022 /* 1023 * XXX - should we really limit each write to z_max_blksz? 1024 * Perhaps we should use SPA_MAXBLOCKSIZE chunks? 1025 */ 1026 nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz)); 1027 1028 if (woff + nbytes > zp->z_size) 1029 vnode_pager_setsize(vp, woff + nbytes); 1030 1031 if (abuf == NULL) { 1032 tx_bytes = uio->uio_resid; 1033 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl), 1034 uio, nbytes, tx); 1035 tx_bytes -= uio->uio_resid; 1036 } else { 1037 tx_bytes = nbytes; 1038 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len); 1039 /* 1040 * If this is not a full block write, but we are 1041 * extending the file past EOF and this data starts 1042 * block-aligned, use assign_arcbuf(). Otherwise, 1043 * write via dmu_write(). 1044 */ 1045 if (tx_bytes < max_blksz && (!write_eof || 1046 aiov->iov_base != abuf->b_data)) { 1047 ASSERT(xuio); 1048 dmu_write(zfsvfs->z_os, zp->z_id, woff, 1049 aiov->iov_len, aiov->iov_base, tx); 1050 dmu_return_arcbuf(abuf); 1051 xuio_stat_wbuf_copied(); 1052 } else { 1053 ASSERT(xuio || tx_bytes == max_blksz); 1054 dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl), 1055 woff, abuf, tx); 1056 } 1057 ASSERT(tx_bytes <= uio->uio_resid); 1058 uioskip(uio, tx_bytes); 1059 } 1060 if (tx_bytes && vn_has_cached_data(vp)) { 1061 update_pages(vp, woff, tx_bytes, zfsvfs->z_os, 1062 zp->z_id, uio->uio_segflg, tx); 1063 } 1064 1065 /* 1066 * If we made no progress, we're done. If we made even 1067 * partial progress, update the znode and ZIL accordingly. 1068 */ 1069 if (tx_bytes == 0) { 1070 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs), 1071 (void *)&zp->z_size, sizeof (uint64_t), tx); 1072 dmu_tx_commit(tx); 1073 ASSERT(error != 0); 1074 break; 1075 } 1076 1077 /* 1078 * Clear Set-UID/Set-GID bits on successful write if not 1079 * privileged and at least one of the excute bits is set. 1080 * 1081 * It would be nice to to this after all writes have 1082 * been done, but that would still expose the ISUID/ISGID 1083 * to another app after the partial write is committed. 1084 * 1085 * Note: we don't call zfs_fuid_map_id() here because 1086 * user 0 is not an ephemeral uid. 1087 */ 1088 mutex_enter(&zp->z_acl_lock); 1089 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) | 1090 (S_IXUSR >> 6))) != 0 && 1091 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 && 1092 secpolicy_vnode_setid_retain(vp, cr, 1093 (zp->z_mode & S_ISUID) != 0 && zp->z_uid == 0) != 0) { 1094 uint64_t newmode; 1095 zp->z_mode &= ~(S_ISUID | S_ISGID); 1096 newmode = zp->z_mode; 1097 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), 1098 (void *)&newmode, sizeof (uint64_t), tx); 1099 } 1100 mutex_exit(&zp->z_acl_lock); 1101 1102 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 1103 B_TRUE); 1104 1105 /* 1106 * Update the file size (zp_size) if it has changed; 1107 * account for possible concurrent updates. 1108 */ 1109 while ((end_size = zp->z_size) < uio->uio_loffset) { 1110 (void) atomic_cas_64(&zp->z_size, end_size, 1111 uio->uio_loffset); 1112 ASSERT(error == 0); 1113 } 1114 /* 1115 * If we are replaying and eof is non zero then force 1116 * the file size to the specified eof. Note, there's no 1117 * concurrency during replay. 1118 */ 1119 if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0) 1120 zp->z_size = zfsvfs->z_replay_eof; 1121 1122 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 1123 1124 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag); 1125 dmu_tx_commit(tx); 1126 1127 if (error != 0) 1128 break; 1129 ASSERT(tx_bytes == nbytes); 1130 n -= nbytes; 1131 1132#ifdef sun 1133 if (!xuio && n > 0) 1134 uio_prefaultpages(MIN(n, max_blksz), uio); 1135#endif /* sun */ 1136 } 1137 1138 zfs_range_unlock(rl); 1139 1140 /* 1141 * If we're in replay mode, or we made no progress, return error. 1142 * Otherwise, it's at least a partial write, so it's successful. 1143 */ 1144 if (zfsvfs->z_replay || uio->uio_resid == start_resid) { 1145 ZFS_EXIT(zfsvfs); 1146 return (error); 1147 } 1148 1149 if (ioflag & (FSYNC | FDSYNC) || 1150 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 1151 zil_commit(zilog, zp->z_id); 1152 1153 ZFS_EXIT(zfsvfs); 1154 return (0); 1155} 1156 1157void 1158zfs_get_done(zgd_t *zgd, int error) 1159{ 1160 znode_t *zp = zgd->zgd_private; 1161 objset_t *os = zp->z_zfsvfs->z_os; 1162 1163 if (zgd->zgd_db) 1164 dmu_buf_rele(zgd->zgd_db, zgd); 1165 1166 zfs_range_unlock(zgd->zgd_rl); 1167 1168 /* 1169 * Release the vnode asynchronously as we currently have the 1170 * txg stopped from syncing. 1171 */ 1172 VN_RELE_ASYNC(ZTOV(zp), dsl_pool_vnrele_taskq(dmu_objset_pool(os))); 1173 1174 if (error == 0 && zgd->zgd_bp) 1175 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 1176 1177 kmem_free(zgd, sizeof (zgd_t)); 1178} 1179 1180#ifdef DEBUG 1181static int zil_fault_io = 0; 1182#endif 1183 1184/* 1185 * Get data to generate a TX_WRITE intent log record. 1186 */ 1187int 1188zfs_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 1189{ 1190 zfsvfs_t *zfsvfs = arg; 1191 objset_t *os = zfsvfs->z_os; 1192 znode_t *zp; 1193 uint64_t object = lr->lr_foid; 1194 uint64_t offset = lr->lr_offset; 1195 uint64_t size = lr->lr_length; 1196 blkptr_t *bp = &lr->lr_blkptr; 1197 dmu_buf_t *db; 1198 zgd_t *zgd; 1199 int error = 0; 1200 1201 ASSERT(zio != NULL); 1202 ASSERT(size != 0); 1203 1204 /* 1205 * Nothing to do if the file has been removed 1206 */ 1207 if (zfs_zget(zfsvfs, object, &zp) != 0) 1208 return (SET_ERROR(ENOENT)); 1209 if (zp->z_unlinked) { 1210 /* 1211 * Release the vnode asynchronously as we currently have the 1212 * txg stopped from syncing. 1213 */ 1214 VN_RELE_ASYNC(ZTOV(zp), 1215 dsl_pool_vnrele_taskq(dmu_objset_pool(os))); 1216 return (SET_ERROR(ENOENT)); 1217 } 1218 1219 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1220 zgd->zgd_zilog = zfsvfs->z_log; 1221 zgd->zgd_private = zp; 1222 1223 /* 1224 * Write records come in two flavors: immediate and indirect. 1225 * For small writes it's cheaper to store the data with the 1226 * log record (immediate); for large writes it's cheaper to 1227 * sync the data and get a pointer to it (indirect) so that 1228 * we don't have to write the data twice. 1229 */ 1230 if (buf != NULL) { /* immediate write */ 1231 zgd->zgd_rl = zfs_range_lock(zp, offset, size, RL_READER); 1232 /* test for truncation needs to be done while range locked */ 1233 if (offset >= zp->z_size) { 1234 error = SET_ERROR(ENOENT); 1235 } else { 1236 error = dmu_read(os, object, offset, size, buf, 1237 DMU_READ_NO_PREFETCH); 1238 } 1239 ASSERT(error == 0 || error == ENOENT); 1240 } else { /* indirect write */ 1241 /* 1242 * Have to lock the whole block to ensure when it's 1243 * written out and it's checksum is being calculated 1244 * that no one can change the data. We need to re-check 1245 * blocksize after we get the lock in case it's changed! 1246 */ 1247 for (;;) { 1248 uint64_t blkoff; 1249 size = zp->z_blksz; 1250 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset; 1251 offset -= blkoff; 1252 zgd->zgd_rl = zfs_range_lock(zp, offset, size, 1253 RL_READER); 1254 if (zp->z_blksz == size) 1255 break; 1256 offset += blkoff; 1257 zfs_range_unlock(zgd->zgd_rl); 1258 } 1259 /* test for truncation needs to be done while range locked */ 1260 if (lr->lr_offset >= zp->z_size) 1261 error = SET_ERROR(ENOENT); 1262#ifdef DEBUG 1263 if (zil_fault_io) { 1264 error = SET_ERROR(EIO); 1265 zil_fault_io = 0; 1266 } 1267#endif 1268 if (error == 0) 1269 error = dmu_buf_hold(os, object, offset, zgd, &db, 1270 DMU_READ_NO_PREFETCH); 1271 1272 if (error == 0) { 1273 blkptr_t *obp = dmu_buf_get_blkptr(db); 1274 if (obp) { 1275 ASSERT(BP_IS_HOLE(bp)); 1276 *bp = *obp; 1277 } 1278 1279 zgd->zgd_db = db; 1280 zgd->zgd_bp = bp; 1281 1282 ASSERT(db->db_offset == offset); 1283 ASSERT(db->db_size == size); 1284 1285 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1286 zfs_get_done, zgd); 1287 ASSERT(error || lr->lr_length <= zp->z_blksz); 1288 1289 /* 1290 * On success, we need to wait for the write I/O 1291 * initiated by dmu_sync() to complete before we can 1292 * release this dbuf. We will finish everything up 1293 * in the zfs_get_done() callback. 1294 */ 1295 if (error == 0) 1296 return (0); 1297 1298 if (error == EALREADY) { 1299 lr->lr_common.lrc_txtype = TX_WRITE2; 1300 error = 0; 1301 } 1302 } 1303 } 1304 1305 zfs_get_done(zgd, error); 1306 1307 return (error); 1308} 1309 1310/*ARGSUSED*/ 1311static int 1312zfs_access(vnode_t *vp, int mode, int flag, cred_t *cr, 1313 caller_context_t *ct) 1314{ 1315 znode_t *zp = VTOZ(vp); 1316 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1317 int error; 1318 1319 ZFS_ENTER(zfsvfs); 1320 ZFS_VERIFY_ZP(zp); 1321 1322 if (flag & V_ACE_MASK) 1323 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr); 1324 else 1325 error = zfs_zaccess_rwx(zp, mode, flag, cr); 1326 1327 ZFS_EXIT(zfsvfs); 1328 return (error); 1329} 1330 1331/* 1332 * If vnode is for a device return a specfs vnode instead. 1333 */ 1334static int 1335specvp_check(vnode_t **vpp, cred_t *cr) 1336{ 1337 int error = 0; 1338 1339 if (IS_DEVVP(*vpp)) { 1340 struct vnode *svp; 1341 1342 svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); 1343 VN_RELE(*vpp); 1344 if (svp == NULL) 1345 error = SET_ERROR(ENOSYS); 1346 *vpp = svp; 1347 } 1348 return (error); 1349} 1350 1351 1352/* 1353 * Lookup an entry in a directory, or an extended attribute directory. 1354 * If it exists, return a held vnode reference for it. 1355 * 1356 * IN: dvp - vnode of directory to search. 1357 * nm - name of entry to lookup. 1358 * pnp - full pathname to lookup [UNUSED]. 1359 * flags - LOOKUP_XATTR set if looking for an attribute. 1360 * rdir - root directory vnode [UNUSED]. 1361 * cr - credentials of caller. 1362 * ct - caller context 1363 * direntflags - directory lookup flags 1364 * realpnp - returned pathname. 1365 * 1366 * OUT: vpp - vnode of located entry, NULL if not found. 1367 * 1368 * RETURN: 0 on success, error code on failure. 1369 * 1370 * Timestamps: 1371 * NA 1372 */ 1373/* ARGSUSED */ 1374static int 1375zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct componentname *cnp, 1376 int nameiop, cred_t *cr, kthread_t *td, int flags) 1377{ 1378 znode_t *zdp = VTOZ(dvp); 1379 zfsvfs_t *zfsvfs = zdp->z_zfsvfs; 1380 int error = 0; 1381 int *direntflags = NULL; 1382 void *realpnp = NULL; 1383 1384 /* fast path */ 1385 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) { 1386 1387 if (dvp->v_type != VDIR) { 1388 return (SET_ERROR(ENOTDIR)); 1389 } else if (zdp->z_sa_hdl == NULL) { 1390 return (SET_ERROR(EIO)); 1391 } 1392 1393 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) { 1394 error = zfs_fastaccesschk_execute(zdp, cr); 1395 if (!error) { 1396 *vpp = dvp; 1397 VN_HOLD(*vpp); 1398 return (0); 1399 } 1400 return (error); 1401 } else { 1402 vnode_t *tvp = dnlc_lookup(dvp, nm); 1403 1404 if (tvp) { 1405 error = zfs_fastaccesschk_execute(zdp, cr); 1406 if (error) { 1407 VN_RELE(tvp); 1408 return (error); 1409 } 1410 if (tvp == DNLC_NO_VNODE) { 1411 VN_RELE(tvp); 1412 return (SET_ERROR(ENOENT)); 1413 } else { 1414 *vpp = tvp; 1415 return (specvp_check(vpp, cr)); 1416 } 1417 } 1418 } 1419 } 1420 1421 DTRACE_PROBE2(zfs__fastpath__lookup__miss, vnode_t *, dvp, char *, nm); 1422 1423 ZFS_ENTER(zfsvfs); 1424 ZFS_VERIFY_ZP(zdp); 1425 1426 *vpp = NULL; 1427 1428 if (flags & LOOKUP_XATTR) { 1429#ifdef TODO 1430 /* 1431 * If the xattr property is off, refuse the lookup request. 1432 */ 1433 if (!(zfsvfs->z_vfs->vfs_flag & VFS_XATTR)) { 1434 ZFS_EXIT(zfsvfs); 1435 return (SET_ERROR(EINVAL)); 1436 } 1437#endif 1438 1439 /* 1440 * We don't allow recursive attributes.. 1441 * Maybe someday we will. 1442 */ 1443 if (zdp->z_pflags & ZFS_XATTR) { 1444 ZFS_EXIT(zfsvfs); 1445 return (SET_ERROR(EINVAL)); 1446 } 1447 1448 if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr, flags)) { 1449 ZFS_EXIT(zfsvfs); 1450 return (error); 1451 } 1452 1453 /* 1454 * Do we have permission to get into attribute directory? 1455 */ 1456 1457 if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, 0, 1458 B_FALSE, cr)) { 1459 VN_RELE(*vpp); 1460 *vpp = NULL; 1461 } 1462 1463 ZFS_EXIT(zfsvfs); 1464 return (error); 1465 } 1466 1467 if (dvp->v_type != VDIR) { 1468 ZFS_EXIT(zfsvfs); 1469 return (SET_ERROR(ENOTDIR)); 1470 } 1471 1472 /* 1473 * Check accessibility of directory. 1474 */ 1475 1476 if (error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr)) { 1477 ZFS_EXIT(zfsvfs); 1478 return (error); 1479 } 1480 1481 if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm), 1482 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 1483 ZFS_EXIT(zfsvfs); 1484 return (SET_ERROR(EILSEQ)); 1485 } 1486 1487 error = zfs_dirlook(zdp, nm, vpp, flags, direntflags, realpnp); 1488 if (error == 0) 1489 error = specvp_check(vpp, cr); 1490 1491 /* Translate errors and add SAVENAME when needed. */ 1492 if (cnp->cn_flags & ISLASTCN) { 1493 switch (nameiop) { 1494 case CREATE: 1495 case RENAME: 1496 if (error == ENOENT) { 1497 error = EJUSTRETURN; 1498 cnp->cn_flags |= SAVENAME; 1499 break; 1500 } 1501 /* FALLTHROUGH */ 1502 case DELETE: 1503 if (error == 0) 1504 cnp->cn_flags |= SAVENAME; 1505 break; 1506 } 1507 } 1508 if (error == 0 && (nm[0] != '.' || nm[1] != '\0')) { 1509 int ltype = 0; 1510 1511 if (cnp->cn_flags & ISDOTDOT) { 1512 ltype = VOP_ISLOCKED(dvp); 1513 VOP_UNLOCK(dvp, 0); 1514 } 1515 ZFS_EXIT(zfsvfs); 1516 error = vn_lock(*vpp, cnp->cn_lkflags); 1517 if (cnp->cn_flags & ISDOTDOT) 1518 vn_lock(dvp, ltype | LK_RETRY); 1519 if (error != 0) { 1520 VN_RELE(*vpp); 1521 *vpp = NULL; 1522 return (error); 1523 } 1524 } else { 1525 ZFS_EXIT(zfsvfs); 1526 } 1527 1528#ifdef FREEBSD_NAMECACHE 1529 /* 1530 * Insert name into cache (as non-existent) if appropriate. 1531 */ 1532 if (error == ENOENT && (cnp->cn_flags & MAKEENTRY) && nameiop != CREATE) 1533 cache_enter(dvp, *vpp, cnp); 1534 /* 1535 * Insert name into cache if appropriate. 1536 */ 1537 if (error == 0 && (cnp->cn_flags & MAKEENTRY)) { 1538 if (!(cnp->cn_flags & ISLASTCN) || 1539 (nameiop != DELETE && nameiop != RENAME)) { 1540 cache_enter(dvp, *vpp, cnp); 1541 } 1542 } 1543#endif 1544 1545 return (error); 1546} 1547 1548/* 1549 * Attempt to create a new entry in a directory. If the entry 1550 * already exists, truncate the file if permissible, else return 1551 * an error. Return the vp of the created or trunc'd file. 1552 * 1553 * IN: dvp - vnode of directory to put new file entry in. 1554 * name - name of new file entry. 1555 * vap - attributes of new file. 1556 * excl - flag indicating exclusive or non-exclusive mode. 1557 * mode - mode to open file with. 1558 * cr - credentials of caller. 1559 * flag - large file flag [UNUSED]. 1560 * ct - caller context 1561 * vsecp - ACL to be set 1562 * 1563 * OUT: vpp - vnode of created or trunc'd entry. 1564 * 1565 * RETURN: 0 on success, error code on failure. 1566 * 1567 * Timestamps: 1568 * dvp - ctime|mtime updated if new entry created 1569 * vp - ctime|mtime always, atime if new 1570 */ 1571 1572/* ARGSUSED */ 1573static int 1574zfs_create(vnode_t *dvp, char *name, vattr_t *vap, int excl, int mode, 1575 vnode_t **vpp, cred_t *cr, kthread_t *td) 1576{ 1577 znode_t *zp, *dzp = VTOZ(dvp); 1578 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1579 zilog_t *zilog; 1580 objset_t *os; 1581 zfs_dirlock_t *dl; 1582 dmu_tx_t *tx; 1583 int error; 1584 ksid_t *ksid; 1585 uid_t uid; 1586 gid_t gid = crgetgid(cr); 1587 zfs_acl_ids_t acl_ids; 1588 boolean_t fuid_dirtied; 1589 boolean_t have_acl = B_FALSE; 1590 boolean_t waited = B_FALSE; 1591 void *vsecp = NULL; 1592 int flag = 0; 1593 1594 /* 1595 * If we have an ephemeral id, ACL, or XVATTR then 1596 * make sure file system is at proper version 1597 */ 1598 1599 ksid = crgetsid(cr, KSID_OWNER); 1600 if (ksid) 1601 uid = ksid_getid(ksid); 1602 else 1603 uid = crgetuid(cr); 1604 1605 if (zfsvfs->z_use_fuids == B_FALSE && 1606 (vsecp || (vap->va_mask & AT_XVATTR) || 1607 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid))) 1608 return (SET_ERROR(EINVAL)); 1609 1610 ZFS_ENTER(zfsvfs); 1611 ZFS_VERIFY_ZP(dzp); 1612 os = zfsvfs->z_os; 1613 zilog = zfsvfs->z_log; 1614 1615 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name), 1616 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 1617 ZFS_EXIT(zfsvfs); 1618 return (SET_ERROR(EILSEQ)); 1619 } 1620 1621 if (vap->va_mask & AT_XVATTR) { 1622 if ((error = secpolicy_xvattr(dvp, (xvattr_t *)vap, 1623 crgetuid(cr), cr, vap->va_type)) != 0) { 1624 ZFS_EXIT(zfsvfs); 1625 return (error); 1626 } 1627 } 1628 1629 getnewvnode_reserve(1); 1630 1631top: 1632 *vpp = NULL; 1633 1634 if ((vap->va_mode & S_ISVTX) && secpolicy_vnode_stky_modify(cr)) 1635 vap->va_mode &= ~S_ISVTX; 1636 1637 if (*name == '\0') { 1638 /* 1639 * Null component name refers to the directory itself. 1640 */ 1641 VN_HOLD(dvp); 1642 zp = dzp; 1643 dl = NULL; 1644 error = 0; 1645 } else { 1646 /* possible VN_HOLD(zp) */ 1647 int zflg = 0; 1648 1649 if (flag & FIGNORECASE) 1650 zflg |= ZCILOOK; 1651 1652 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 1653 NULL, NULL); 1654 if (error) { 1655 if (have_acl) 1656 zfs_acl_ids_free(&acl_ids); 1657 if (strcmp(name, "..") == 0) 1658 error = SET_ERROR(EISDIR); 1659 getnewvnode_drop_reserve(); 1660 ZFS_EXIT(zfsvfs); 1661 return (error); 1662 } 1663 } 1664 1665 if (zp == NULL) { 1666 uint64_t txtype; 1667 1668 /* 1669 * Create a new file object and update the directory 1670 * to reference it. 1671 */ 1672 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 1673 if (have_acl) 1674 zfs_acl_ids_free(&acl_ids); 1675 goto out; 1676 } 1677 1678 /* 1679 * We only support the creation of regular files in 1680 * extended attribute directories. 1681 */ 1682 1683 if ((dzp->z_pflags & ZFS_XATTR) && 1684 (vap->va_type != VREG)) { 1685 if (have_acl) 1686 zfs_acl_ids_free(&acl_ids); 1687 error = SET_ERROR(EINVAL); 1688 goto out; 1689 } 1690 1691 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap, 1692 cr, vsecp, &acl_ids)) != 0) 1693 goto out; 1694 have_acl = B_TRUE; 1695 1696 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 1697 zfs_acl_ids_free(&acl_ids); 1698 error = SET_ERROR(EDQUOT); 1699 goto out; 1700 } 1701 1702 tx = dmu_tx_create(os); 1703 1704 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 1705 ZFS_SA_BASE_ATTR_SIZE); 1706 1707 fuid_dirtied = zfsvfs->z_fuid_dirty; 1708 if (fuid_dirtied) 1709 zfs_fuid_txhold(zfsvfs, tx); 1710 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 1711 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); 1712 if (!zfsvfs->z_use_sa && 1713 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1714 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 1715 0, acl_ids.z_aclp->z_acl_bytes); 1716 } 1717 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 1718 if (error) { 1719 zfs_dirent_unlock(dl); 1720 if (error == ERESTART) { 1721 waited = B_TRUE; 1722 dmu_tx_wait(tx); 1723 dmu_tx_abort(tx); 1724 goto top; 1725 } 1726 zfs_acl_ids_free(&acl_ids); 1727 dmu_tx_abort(tx); 1728 getnewvnode_drop_reserve(); 1729 ZFS_EXIT(zfsvfs); 1730 return (error); 1731 } 1732 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 1733 1734 if (fuid_dirtied) 1735 zfs_fuid_sync(zfsvfs, tx); 1736 1737 (void) zfs_link_create(dl, zp, tx, ZNEW); 1738 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap); 1739 if (flag & FIGNORECASE) 1740 txtype |= TX_CI; 1741 zfs_log_create(zilog, tx, txtype, dzp, zp, name, 1742 vsecp, acl_ids.z_fuidp, vap); 1743 zfs_acl_ids_free(&acl_ids); 1744 dmu_tx_commit(tx); 1745 } else { 1746 int aflags = (flag & FAPPEND) ? V_APPEND : 0; 1747 1748 if (have_acl) 1749 zfs_acl_ids_free(&acl_ids); 1750 have_acl = B_FALSE; 1751 1752 /* 1753 * A directory entry already exists for this name. 1754 */ 1755 /* 1756 * Can't truncate an existing file if in exclusive mode. 1757 */ 1758 if (excl == EXCL) { 1759 error = SET_ERROR(EEXIST); 1760 goto out; 1761 } 1762 /* 1763 * Can't open a directory for writing. 1764 */ 1765 if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) { 1766 error = SET_ERROR(EISDIR); 1767 goto out; 1768 } 1769 /* 1770 * Verify requested access to file. 1771 */ 1772 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) { 1773 goto out; 1774 } 1775 1776 mutex_enter(&dzp->z_lock); 1777 dzp->z_seq++; 1778 mutex_exit(&dzp->z_lock); 1779 1780 /* 1781 * Truncate regular files if requested. 1782 */ 1783 if ((ZTOV(zp)->v_type == VREG) && 1784 (vap->va_mask & AT_SIZE) && (vap->va_size == 0)) { 1785 /* we can't hold any locks when calling zfs_freesp() */ 1786 zfs_dirent_unlock(dl); 1787 dl = NULL; 1788 error = zfs_freesp(zp, 0, 0, mode, TRUE); 1789 if (error == 0) { 1790 vnevent_create(ZTOV(zp), ct); 1791 } 1792 } 1793 } 1794out: 1795 getnewvnode_drop_reserve(); 1796 if (dl) 1797 zfs_dirent_unlock(dl); 1798 1799 if (error) { 1800 if (zp) 1801 VN_RELE(ZTOV(zp)); 1802 } else { 1803 *vpp = ZTOV(zp); 1804 error = specvp_check(vpp, cr); 1805 } 1806 1807 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 1808 zil_commit(zilog, 0); 1809 1810 ZFS_EXIT(zfsvfs); 1811 return (error); 1812} 1813 1814/* 1815 * Remove an entry from a directory. 1816 * 1817 * IN: dvp - vnode of directory to remove entry from. 1818 * name - name of entry to remove. 1819 * cr - credentials of caller. 1820 * ct - caller context 1821 * flags - case flags 1822 * 1823 * RETURN: 0 on success, error code on failure. 1824 * 1825 * Timestamps: 1826 * dvp - ctime|mtime 1827 * vp - ctime (if nlink > 0) 1828 */ 1829 1830uint64_t null_xattr = 0; 1831 1832/*ARGSUSED*/ 1833static int 1834zfs_remove(vnode_t *dvp, char *name, cred_t *cr, caller_context_t *ct, 1835 int flags) 1836{ 1837 znode_t *zp, *dzp = VTOZ(dvp); 1838 znode_t *xzp; 1839 vnode_t *vp; 1840 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1841 zilog_t *zilog; 1842 uint64_t acl_obj, xattr_obj; 1843 uint64_t xattr_obj_unlinked = 0; 1844 uint64_t obj = 0; 1845 zfs_dirlock_t *dl; 1846 dmu_tx_t *tx; 1847 boolean_t may_delete_now, delete_now = FALSE; 1848 boolean_t unlinked, toobig = FALSE; 1849 uint64_t txtype; 1850 pathname_t *realnmp = NULL; 1851 pathname_t realnm; 1852 int error; 1853 int zflg = ZEXISTS; 1854 boolean_t waited = B_FALSE; 1855 1856 ZFS_ENTER(zfsvfs); 1857 ZFS_VERIFY_ZP(dzp); 1858 zilog = zfsvfs->z_log; 1859 1860 if (flags & FIGNORECASE) { 1861 zflg |= ZCILOOK; 1862 pn_alloc(&realnm); 1863 realnmp = &realnm; 1864 } 1865 1866top: 1867 xattr_obj = 0; 1868 xzp = NULL; 1869 /* 1870 * Attempt to lock directory; fail if entry doesn't exist. 1871 */ 1872 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 1873 NULL, realnmp)) { 1874 if (realnmp) 1875 pn_free(realnmp); 1876 ZFS_EXIT(zfsvfs); 1877 return (error); 1878 } 1879 1880 vp = ZTOV(zp); 1881 1882 if (error = zfs_zaccess_delete(dzp, zp, cr)) { 1883 goto out; 1884 } 1885 1886 /* 1887 * Need to use rmdir for removing directories. 1888 */ 1889 if (vp->v_type == VDIR) { 1890 error = SET_ERROR(EPERM); 1891 goto out; 1892 } 1893 1894 vnevent_remove(vp, dvp, name, ct); 1895 1896 if (realnmp) 1897 dnlc_remove(dvp, realnmp->pn_buf); 1898 else 1899 dnlc_remove(dvp, name); 1900 1901 VI_LOCK(vp); 1902 may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp); 1903 VI_UNLOCK(vp); 1904 1905 /* 1906 * We may delete the znode now, or we may put it in the unlinked set; 1907 * it depends on whether we're the last link, and on whether there are 1908 * other holds on the vnode. So we dmu_tx_hold() the right things to 1909 * allow for either case. 1910 */ 1911 obj = zp->z_id; 1912 tx = dmu_tx_create(zfsvfs->z_os); 1913 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name); 1914 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1915 zfs_sa_upgrade_txholds(tx, zp); 1916 zfs_sa_upgrade_txholds(tx, dzp); 1917 if (may_delete_now) { 1918 toobig = 1919 zp->z_size > zp->z_blksz * DMU_MAX_DELETEBLKCNT; 1920 /* if the file is too big, only hold_free a token amount */ 1921 dmu_tx_hold_free(tx, zp->z_id, 0, 1922 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END)); 1923 } 1924 1925 /* are there any extended attributes? */ 1926 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 1927 &xattr_obj, sizeof (xattr_obj)); 1928 if (error == 0 && xattr_obj) { 1929 error = zfs_zget(zfsvfs, xattr_obj, &xzp); 1930 ASSERT0(error); 1931 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 1932 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); 1933 } 1934 1935 mutex_enter(&zp->z_lock); 1936 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now) 1937 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); 1938 mutex_exit(&zp->z_lock); 1939 1940 /* charge as an update -- would be nice not to charge at all */ 1941 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 1942 1943 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 1944 if (error) { 1945 zfs_dirent_unlock(dl); 1946 VN_RELE(vp); 1947 if (xzp) 1948 VN_RELE(ZTOV(xzp)); 1949 if (error == ERESTART) { 1950 waited = B_TRUE; 1951 dmu_tx_wait(tx); 1952 dmu_tx_abort(tx); 1953 goto top; 1954 } 1955 if (realnmp) 1956 pn_free(realnmp); 1957 dmu_tx_abort(tx); 1958 ZFS_EXIT(zfsvfs); 1959 return (error); 1960 } 1961 1962 /* 1963 * Remove the directory entry. 1964 */ 1965 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked); 1966 1967 if (error) { 1968 dmu_tx_commit(tx); 1969 goto out; 1970 } 1971 1972 if (unlinked) { 1973 1974 /* 1975 * Hold z_lock so that we can make sure that the ACL obj 1976 * hasn't changed. Could have been deleted due to 1977 * zfs_sa_upgrade(). 1978 */ 1979 mutex_enter(&zp->z_lock); 1980 VI_LOCK(vp); 1981 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 1982 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked)); 1983 delete_now = may_delete_now && !toobig && 1984 vp->v_count == 1 && !vn_has_cached_data(vp) && 1985 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) == 1986 acl_obj; 1987 VI_UNLOCK(vp); 1988 } 1989 1990 if (delete_now) { 1991#ifdef __FreeBSD__ 1992 panic("zfs_remove: delete_now branch taken"); 1993#endif 1994 if (xattr_obj_unlinked) { 1995 ASSERT3U(xzp->z_links, ==, 2); 1996 mutex_enter(&xzp->z_lock); 1997 xzp->z_unlinked = 1; 1998 xzp->z_links = 0; 1999 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs), 2000 &xzp->z_links, sizeof (xzp->z_links), tx); 2001 ASSERT3U(error, ==, 0); 2002 mutex_exit(&xzp->z_lock); 2003 zfs_unlinked_add(xzp, tx); 2004 2005 if (zp->z_is_sa) 2006 error = sa_remove(zp->z_sa_hdl, 2007 SA_ZPL_XATTR(zfsvfs), tx); 2008 else 2009 error = sa_update(zp->z_sa_hdl, 2010 SA_ZPL_XATTR(zfsvfs), &null_xattr, 2011 sizeof (uint64_t), tx); 2012 ASSERT0(error); 2013 } 2014 VI_LOCK(vp); 2015 vp->v_count--; 2016 ASSERT0(vp->v_count); 2017 VI_UNLOCK(vp); 2018 mutex_exit(&zp->z_lock); 2019 zfs_znode_delete(zp, tx); 2020 } else if (unlinked) { 2021 mutex_exit(&zp->z_lock); 2022 zfs_unlinked_add(zp, tx); 2023#ifdef __FreeBSD__ 2024 vp->v_vflag |= VV_NOSYNC; 2025#endif 2026 } 2027 2028 txtype = TX_REMOVE; 2029 if (flags & FIGNORECASE) 2030 txtype |= TX_CI; 2031 zfs_log_remove(zilog, tx, txtype, dzp, name, obj); 2032 2033 dmu_tx_commit(tx); 2034out: 2035 if (realnmp) 2036 pn_free(realnmp); 2037 2038 zfs_dirent_unlock(dl); 2039 2040 if (!delete_now) 2041 VN_RELE(vp); 2042 if (xzp) 2043 VN_RELE(ZTOV(xzp)); 2044 2045 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2046 zil_commit(zilog, 0); 2047 2048 ZFS_EXIT(zfsvfs); 2049 return (error); 2050} 2051 2052/* 2053 * Create a new directory and insert it into dvp using the name 2054 * provided. Return a pointer to the inserted directory. 2055 * 2056 * IN: dvp - vnode of directory to add subdir to. 2057 * dirname - name of new directory. 2058 * vap - attributes of new directory. 2059 * cr - credentials of caller. 2060 * ct - caller context 2061 * flags - case flags 2062 * vsecp - ACL to be set 2063 * 2064 * OUT: vpp - vnode of created directory. 2065 * 2066 * RETURN: 0 on success, error code on failure. 2067 * 2068 * Timestamps: 2069 * dvp - ctime|mtime updated 2070 * vp - ctime|mtime|atime updated 2071 */ 2072/*ARGSUSED*/ 2073static int 2074zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr, 2075 caller_context_t *ct, int flags, vsecattr_t *vsecp) 2076{ 2077 znode_t *zp, *dzp = VTOZ(dvp); 2078 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 2079 zilog_t *zilog; 2080 zfs_dirlock_t *dl; 2081 uint64_t txtype; 2082 dmu_tx_t *tx; 2083 int error; 2084 int zf = ZNEW; 2085 ksid_t *ksid; 2086 uid_t uid; 2087 gid_t gid = crgetgid(cr); 2088 zfs_acl_ids_t acl_ids; 2089 boolean_t fuid_dirtied; 2090 boolean_t waited = B_FALSE; 2091 2092 ASSERT(vap->va_type == VDIR); 2093 2094 /* 2095 * If we have an ephemeral id, ACL, or XVATTR then 2096 * make sure file system is at proper version 2097 */ 2098 2099 ksid = crgetsid(cr, KSID_OWNER); 2100 if (ksid) 2101 uid = ksid_getid(ksid); 2102 else 2103 uid = crgetuid(cr); 2104 if (zfsvfs->z_use_fuids == B_FALSE && 2105 (vsecp || (vap->va_mask & AT_XVATTR) || 2106 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid))) 2107 return (SET_ERROR(EINVAL)); 2108 2109 ZFS_ENTER(zfsvfs); 2110 ZFS_VERIFY_ZP(dzp); 2111 zilog = zfsvfs->z_log; 2112 2113 if (dzp->z_pflags & ZFS_XATTR) { 2114 ZFS_EXIT(zfsvfs); 2115 return (SET_ERROR(EINVAL)); 2116 } 2117 2118 if (zfsvfs->z_utf8 && u8_validate(dirname, 2119 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 2120 ZFS_EXIT(zfsvfs); 2121 return (SET_ERROR(EILSEQ)); 2122 } 2123 if (flags & FIGNORECASE) 2124 zf |= ZCILOOK; 2125 2126 if (vap->va_mask & AT_XVATTR) { 2127 if ((error = secpolicy_xvattr(dvp, (xvattr_t *)vap, 2128 crgetuid(cr), cr, vap->va_type)) != 0) { 2129 ZFS_EXIT(zfsvfs); 2130 return (error); 2131 } 2132 } 2133 2134 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr, 2135 vsecp, &acl_ids)) != 0) { 2136 ZFS_EXIT(zfsvfs); 2137 return (error); 2138 } 2139 2140 getnewvnode_reserve(1); 2141 2142 /* 2143 * First make sure the new directory doesn't exist. 2144 * 2145 * Existence is checked first to make sure we don't return 2146 * EACCES instead of EEXIST which can cause some applications 2147 * to fail. 2148 */ 2149top: 2150 *vpp = NULL; 2151 2152 if (error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf, 2153 NULL, NULL)) { 2154 zfs_acl_ids_free(&acl_ids); 2155 getnewvnode_drop_reserve(); 2156 ZFS_EXIT(zfsvfs); 2157 return (error); 2158 } 2159 2160 if (error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr)) { 2161 zfs_acl_ids_free(&acl_ids); 2162 zfs_dirent_unlock(dl); 2163 getnewvnode_drop_reserve(); 2164 ZFS_EXIT(zfsvfs); 2165 return (error); 2166 } 2167 2168 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 2169 zfs_acl_ids_free(&acl_ids); 2170 zfs_dirent_unlock(dl); 2171 getnewvnode_drop_reserve(); 2172 ZFS_EXIT(zfsvfs); 2173 return (SET_ERROR(EDQUOT)); 2174 } 2175 2176 /* 2177 * Add a new entry to the directory. 2178 */ 2179 tx = dmu_tx_create(zfsvfs->z_os); 2180 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname); 2181 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2182 fuid_dirtied = zfsvfs->z_fuid_dirty; 2183 if (fuid_dirtied) 2184 zfs_fuid_txhold(zfsvfs, tx); 2185 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2186 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2187 acl_ids.z_aclp->z_acl_bytes); 2188 } 2189 2190 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 2191 ZFS_SA_BASE_ATTR_SIZE); 2192 2193 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 2194 if (error) { 2195 zfs_dirent_unlock(dl); 2196 if (error == ERESTART) { 2197 waited = B_TRUE; 2198 dmu_tx_wait(tx); 2199 dmu_tx_abort(tx); 2200 goto top; 2201 } 2202 zfs_acl_ids_free(&acl_ids); 2203 dmu_tx_abort(tx); 2204 getnewvnode_drop_reserve(); 2205 ZFS_EXIT(zfsvfs); 2206 return (error); 2207 } 2208 2209 /* 2210 * Create new node. 2211 */ 2212 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 2213 2214 if (fuid_dirtied) 2215 zfs_fuid_sync(zfsvfs, tx); 2216 2217 /* 2218 * Now put new name in parent dir. 2219 */ 2220 (void) zfs_link_create(dl, zp, tx, ZNEW); 2221 2222 *vpp = ZTOV(zp); 2223 2224 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap); 2225 if (flags & FIGNORECASE) 2226 txtype |= TX_CI; 2227 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp, 2228 acl_ids.z_fuidp, vap); 2229 2230 zfs_acl_ids_free(&acl_ids); 2231 2232 dmu_tx_commit(tx); 2233 2234 getnewvnode_drop_reserve(); 2235 2236 zfs_dirent_unlock(dl); 2237 2238 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2239 zil_commit(zilog, 0); 2240 2241 ZFS_EXIT(zfsvfs); 2242 return (0); 2243} 2244 2245/* 2246 * Remove a directory subdir entry. If the current working 2247 * directory is the same as the subdir to be removed, the 2248 * remove will fail. 2249 * 2250 * IN: dvp - vnode of directory to remove from. 2251 * name - name of directory to be removed. 2252 * cwd - vnode of current working directory. 2253 * cr - credentials of caller. 2254 * ct - caller context 2255 * flags - case flags 2256 * 2257 * RETURN: 0 on success, error code on failure. 2258 * 2259 * Timestamps: 2260 * dvp - ctime|mtime updated 2261 */ 2262/*ARGSUSED*/ 2263static int 2264zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr, 2265 caller_context_t *ct, int flags) 2266{ 2267 znode_t *dzp = VTOZ(dvp); 2268 znode_t *zp; 2269 vnode_t *vp; 2270 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 2271 zilog_t *zilog; 2272 zfs_dirlock_t *dl; 2273 dmu_tx_t *tx; 2274 int error; 2275 int zflg = ZEXISTS; 2276 boolean_t waited = B_FALSE; 2277 2278 ZFS_ENTER(zfsvfs); 2279 ZFS_VERIFY_ZP(dzp); 2280 zilog = zfsvfs->z_log; 2281 2282 if (flags & FIGNORECASE) 2283 zflg |= ZCILOOK; 2284top: 2285 zp = NULL; 2286 2287 /* 2288 * Attempt to lock directory; fail if entry doesn't exist. 2289 */ 2290 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 2291 NULL, NULL)) { 2292 ZFS_EXIT(zfsvfs); 2293 return (error); 2294 } 2295 2296 vp = ZTOV(zp); 2297 2298 if (error = zfs_zaccess_delete(dzp, zp, cr)) { 2299 goto out; 2300 } 2301 2302 if (vp->v_type != VDIR) { 2303 error = SET_ERROR(ENOTDIR); 2304 goto out; 2305 } 2306 2307 if (vp == cwd) { 2308 error = SET_ERROR(EINVAL); 2309 goto out; 2310 } 2311 2312 vnevent_rmdir(vp, dvp, name, ct); 2313 2314 /* 2315 * Grab a lock on the directory to make sure that noone is 2316 * trying to add (or lookup) entries while we are removing it. 2317 */ 2318 rw_enter(&zp->z_name_lock, RW_WRITER); 2319 2320 /* 2321 * Grab a lock on the parent pointer to make sure we play well 2322 * with the treewalk and directory rename code. 2323 */ 2324 rw_enter(&zp->z_parent_lock, RW_WRITER); 2325 2326 tx = dmu_tx_create(zfsvfs->z_os); 2327 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name); 2328 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 2329 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 2330 zfs_sa_upgrade_txholds(tx, zp); 2331 zfs_sa_upgrade_txholds(tx, dzp); 2332 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 2333 if (error) { 2334 rw_exit(&zp->z_parent_lock); 2335 rw_exit(&zp->z_name_lock); 2336 zfs_dirent_unlock(dl); 2337 VN_RELE(vp); 2338 if (error == ERESTART) { 2339 waited = B_TRUE; 2340 dmu_tx_wait(tx); 2341 dmu_tx_abort(tx); 2342 goto top; 2343 } 2344 dmu_tx_abort(tx); 2345 ZFS_EXIT(zfsvfs); 2346 return (error); 2347 } 2348 2349#ifdef FREEBSD_NAMECACHE 2350 cache_purge(dvp); 2351#endif 2352 2353 error = zfs_link_destroy(dl, zp, tx, zflg, NULL); 2354 2355 if (error == 0) { 2356 uint64_t txtype = TX_RMDIR; 2357 if (flags & FIGNORECASE) 2358 txtype |= TX_CI; 2359 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT); 2360 } 2361 2362 dmu_tx_commit(tx); 2363 2364 rw_exit(&zp->z_parent_lock); 2365 rw_exit(&zp->z_name_lock); 2366#ifdef FREEBSD_NAMECACHE 2367 cache_purge(vp); 2368#endif 2369out: 2370 zfs_dirent_unlock(dl); 2371 2372 VN_RELE(vp); 2373 2374 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2375 zil_commit(zilog, 0); 2376 2377 ZFS_EXIT(zfsvfs); 2378 return (error); 2379} 2380 2381/* 2382 * Read as many directory entries as will fit into the provided 2383 * buffer from the given directory cursor position (specified in 2384 * the uio structure). 2385 * 2386 * IN: vp - vnode of directory to read. 2387 * uio - structure supplying read location, range info, 2388 * and return buffer. 2389 * cr - credentials of caller. 2390 * ct - caller context 2391 * flags - case flags 2392 * 2393 * OUT: uio - updated offset and range, buffer filled. 2394 * eofp - set to true if end-of-file detected. 2395 * 2396 * RETURN: 0 on success, error code on failure. 2397 * 2398 * Timestamps: 2399 * vp - atime updated 2400 * 2401 * Note that the low 4 bits of the cookie returned by zap is always zero. 2402 * This allows us to use the low range for "special" directory entries: 2403 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem, 2404 * we use the offset 2 for the '.zfs' directory. 2405 */ 2406/* ARGSUSED */ 2407static int 2408zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp, int *ncookies, u_long **cookies) 2409{ 2410 znode_t *zp = VTOZ(vp); 2411 iovec_t *iovp; 2412 edirent_t *eodp; 2413 dirent64_t *odp; 2414 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2415 objset_t *os; 2416 caddr_t outbuf; 2417 size_t bufsize; 2418 zap_cursor_t zc; 2419 zap_attribute_t zap; 2420 uint_t bytes_wanted; 2421 uint64_t offset; /* must be unsigned; checks for < 1 */ 2422 uint64_t parent; 2423 int local_eof; 2424 int outcount; 2425 int error; 2426 uint8_t prefetch; 2427 boolean_t check_sysattrs; 2428 uint8_t type; 2429 int ncooks; 2430 u_long *cooks = NULL; 2431 int flags = 0; 2432 2433 ZFS_ENTER(zfsvfs); 2434 ZFS_VERIFY_ZP(zp); 2435 2436 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), 2437 &parent, sizeof (parent))) != 0) { 2438 ZFS_EXIT(zfsvfs); 2439 return (error); 2440 } 2441 2442 /* 2443 * If we are not given an eof variable, 2444 * use a local one. 2445 */ 2446 if (eofp == NULL) 2447 eofp = &local_eof; 2448 2449 /* 2450 * Check for valid iov_len. 2451 */ 2452 if (uio->uio_iov->iov_len <= 0) { 2453 ZFS_EXIT(zfsvfs); 2454 return (SET_ERROR(EINVAL)); 2455 } 2456 2457 /* 2458 * Quit if directory has been removed (posix) 2459 */ 2460 if ((*eofp = zp->z_unlinked) != 0) { 2461 ZFS_EXIT(zfsvfs); 2462 return (0); 2463 } 2464 2465 error = 0; 2466 os = zfsvfs->z_os; 2467 offset = uio->uio_loffset; 2468 prefetch = zp->z_zn_prefetch; 2469 2470 /* 2471 * Initialize the iterator cursor. 2472 */ 2473 if (offset <= 3) { 2474 /* 2475 * Start iteration from the beginning of the directory. 2476 */ 2477 zap_cursor_init(&zc, os, zp->z_id); 2478 } else { 2479 /* 2480 * The offset is a serialized cursor. 2481 */ 2482 zap_cursor_init_serialized(&zc, os, zp->z_id, offset); 2483 } 2484 2485 /* 2486 * Get space to change directory entries into fs independent format. 2487 */ 2488 iovp = uio->uio_iov; 2489 bytes_wanted = iovp->iov_len; 2490 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) { 2491 bufsize = bytes_wanted; 2492 outbuf = kmem_alloc(bufsize, KM_SLEEP); 2493 odp = (struct dirent64 *)outbuf; 2494 } else { 2495 bufsize = bytes_wanted; 2496 outbuf = NULL; 2497 odp = (struct dirent64 *)iovp->iov_base; 2498 } 2499 eodp = (struct edirent *)odp; 2500 2501 if (ncookies != NULL) { 2502 /* 2503 * Minimum entry size is dirent size and 1 byte for a file name. 2504 */ 2505 ncooks = uio->uio_resid / (sizeof(struct dirent) - sizeof(((struct dirent *)NULL)->d_name) + 1); 2506 cooks = malloc(ncooks * sizeof(u_long), M_TEMP, M_WAITOK); 2507 *cookies = cooks; 2508 *ncookies = ncooks; 2509 } 2510 /* 2511 * If this VFS supports the system attribute view interface; and 2512 * we're looking at an extended attribute directory; and we care 2513 * about normalization conflicts on this vfs; then we must check 2514 * for normalization conflicts with the sysattr name space. 2515 */ 2516#ifdef TODO 2517 check_sysattrs = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) && 2518 (vp->v_flag & V_XATTRDIR) && zfsvfs->z_norm && 2519 (flags & V_RDDIR_ENTFLAGS); 2520#else 2521 check_sysattrs = 0; 2522#endif 2523 2524 /* 2525 * Transform to file-system independent format 2526 */ 2527 outcount = 0; 2528 while (outcount < bytes_wanted) { 2529 ino64_t objnum; 2530 ushort_t reclen; 2531 off64_t *next = NULL; 2532 2533 /* 2534 * Special case `.', `..', and `.zfs'. 2535 */ 2536 if (offset == 0) { 2537 (void) strcpy(zap.za_name, "."); 2538 zap.za_normalization_conflict = 0; 2539 objnum = zp->z_id; 2540 type = DT_DIR; 2541 } else if (offset == 1) { 2542 (void) strcpy(zap.za_name, ".."); 2543 zap.za_normalization_conflict = 0; 2544 objnum = parent; 2545 type = DT_DIR; 2546 } else if (offset == 2 && zfs_show_ctldir(zp)) { 2547 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME); 2548 zap.za_normalization_conflict = 0; 2549 objnum = ZFSCTL_INO_ROOT; 2550 type = DT_DIR; 2551 } else { 2552 /* 2553 * Grab next entry. 2554 */ 2555 if (error = zap_cursor_retrieve(&zc, &zap)) { 2556 if ((*eofp = (error == ENOENT)) != 0) 2557 break; 2558 else 2559 goto update; 2560 } 2561 2562 if (zap.za_integer_length != 8 || 2563 zap.za_num_integers != 1) { 2564 cmn_err(CE_WARN, "zap_readdir: bad directory " 2565 "entry, obj = %lld, offset = %lld\n", 2566 (u_longlong_t)zp->z_id, 2567 (u_longlong_t)offset); 2568 error = SET_ERROR(ENXIO); 2569 goto update; 2570 } 2571 2572 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer); 2573 /* 2574 * MacOS X can extract the object type here such as: 2575 * uint8_t type = ZFS_DIRENT_TYPE(zap.za_first_integer); 2576 */ 2577 type = ZFS_DIRENT_TYPE(zap.za_first_integer); 2578 2579 if (check_sysattrs && !zap.za_normalization_conflict) { 2580#ifdef TODO 2581 zap.za_normalization_conflict = 2582 xattr_sysattr_casechk(zap.za_name); 2583#else 2584 panic("%s:%u: TODO", __func__, __LINE__); 2585#endif 2586 } 2587 } 2588 2589 if (flags & V_RDDIR_ACCFILTER) { 2590 /* 2591 * If we have no access at all, don't include 2592 * this entry in the returned information 2593 */ 2594 znode_t *ezp; 2595 if (zfs_zget(zp->z_zfsvfs, objnum, &ezp) != 0) 2596 goto skip_entry; 2597 if (!zfs_has_access(ezp, cr)) { 2598 VN_RELE(ZTOV(ezp)); 2599 goto skip_entry; 2600 } 2601 VN_RELE(ZTOV(ezp)); 2602 } 2603 2604 if (flags & V_RDDIR_ENTFLAGS) 2605 reclen = EDIRENT_RECLEN(strlen(zap.za_name)); 2606 else 2607 reclen = DIRENT64_RECLEN(strlen(zap.za_name)); 2608 2609 /* 2610 * Will this entry fit in the buffer? 2611 */ 2612 if (outcount + reclen > bufsize) { 2613 /* 2614 * Did we manage to fit anything in the buffer? 2615 */ 2616 if (!outcount) { 2617 error = SET_ERROR(EINVAL); 2618 goto update; 2619 } 2620 break; 2621 } 2622 if (flags & V_RDDIR_ENTFLAGS) { 2623 /* 2624 * Add extended flag entry: 2625 */ 2626 eodp->ed_ino = objnum; 2627 eodp->ed_reclen = reclen; 2628 /* NOTE: ed_off is the offset for the *next* entry */ 2629 next = &(eodp->ed_off); 2630 eodp->ed_eflags = zap.za_normalization_conflict ? 2631 ED_CASE_CONFLICT : 0; 2632 (void) strncpy(eodp->ed_name, zap.za_name, 2633 EDIRENT_NAMELEN(reclen)); 2634 eodp = (edirent_t *)((intptr_t)eodp + reclen); 2635 } else { 2636 /* 2637 * Add normal entry: 2638 */ 2639 odp->d_ino = objnum; 2640 odp->d_reclen = reclen; 2641 odp->d_namlen = strlen(zap.za_name); 2642 (void) strlcpy(odp->d_name, zap.za_name, odp->d_namlen + 1); 2643 odp->d_type = type; 2644 odp = (dirent64_t *)((intptr_t)odp + reclen); 2645 } 2646 outcount += reclen; 2647 2648 ASSERT(outcount <= bufsize); 2649 2650 /* Prefetch znode */ 2651 if (prefetch) 2652 dmu_prefetch(os, objnum, 0, 0); 2653 2654 skip_entry: 2655 /* 2656 * Move to the next entry, fill in the previous offset. 2657 */ 2658 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) { 2659 zap_cursor_advance(&zc); 2660 offset = zap_cursor_serialize(&zc); 2661 } else { 2662 offset += 1; 2663 } 2664 2665 if (cooks != NULL) { 2666 *cooks++ = offset; 2667 ncooks--; 2668 KASSERT(ncooks >= 0, ("ncookies=%d", ncooks)); 2669 } 2670 } 2671 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */ 2672 2673 /* Subtract unused cookies */ 2674 if (ncookies != NULL) 2675 *ncookies -= ncooks; 2676 2677 if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) { 2678 iovp->iov_base += outcount; 2679 iovp->iov_len -= outcount; 2680 uio->uio_resid -= outcount; 2681 } else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) { 2682 /* 2683 * Reset the pointer. 2684 */ 2685 offset = uio->uio_loffset; 2686 } 2687 2688update: 2689 zap_cursor_fini(&zc); 2690 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 2691 kmem_free(outbuf, bufsize); 2692 2693 if (error == ENOENT) 2694 error = 0; 2695 2696 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 2697 2698 uio->uio_loffset = offset; 2699 ZFS_EXIT(zfsvfs); 2700 if (error != 0 && cookies != NULL) { 2701 free(*cookies, M_TEMP); 2702 *cookies = NULL; 2703 *ncookies = 0; 2704 } 2705 return (error); 2706} 2707 2708ulong_t zfs_fsync_sync_cnt = 4; 2709 2710static int 2711zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct) 2712{ 2713 znode_t *zp = VTOZ(vp); 2714 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2715 2716 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt); 2717 2718 if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) { 2719 ZFS_ENTER(zfsvfs); 2720 ZFS_VERIFY_ZP(zp); 2721 zil_commit(zfsvfs->z_log, zp->z_id); 2722 ZFS_EXIT(zfsvfs); 2723 } 2724 return (0); 2725} 2726 2727 2728/* 2729 * Get the requested file attributes and place them in the provided 2730 * vattr structure. 2731 * 2732 * IN: vp - vnode of file. 2733 * vap - va_mask identifies requested attributes. 2734 * If AT_XVATTR set, then optional attrs are requested 2735 * flags - ATTR_NOACLCHECK (CIFS server context) 2736 * cr - credentials of caller. 2737 * ct - caller context 2738 * 2739 * OUT: vap - attribute values. 2740 * 2741 * RETURN: 0 (always succeeds). 2742 */ 2743/* ARGSUSED */ 2744static int 2745zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 2746 caller_context_t *ct) 2747{ 2748 znode_t *zp = VTOZ(vp); 2749 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2750 int error = 0; 2751 uint32_t blksize; 2752 u_longlong_t nblocks; 2753 uint64_t links; 2754 uint64_t mtime[2], ctime[2], crtime[2], rdev; 2755 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */ 2756 xoptattr_t *xoap = NULL; 2757 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 2758 sa_bulk_attr_t bulk[4]; 2759 int count = 0; 2760 2761 ZFS_ENTER(zfsvfs); 2762 ZFS_VERIFY_ZP(zp); 2763 2764 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid); 2765 2766 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); 2767 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); 2768 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &crtime, 16); 2769 if (vp->v_type == VBLK || vp->v_type == VCHR) 2770 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_RDEV(zfsvfs), NULL, 2771 &rdev, 8); 2772 2773 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) { 2774 ZFS_EXIT(zfsvfs); 2775 return (error); 2776 } 2777 2778 /* 2779 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES. 2780 * Also, if we are the owner don't bother, since owner should 2781 * always be allowed to read basic attributes of file. 2782 */ 2783 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) && 2784 (vap->va_uid != crgetuid(cr))) { 2785 if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0, 2786 skipaclchk, cr)) { 2787 ZFS_EXIT(zfsvfs); 2788 return (error); 2789 } 2790 } 2791 2792 /* 2793 * Return all attributes. It's cheaper to provide the answer 2794 * than to determine whether we were asked the question. 2795 */ 2796 2797 mutex_enter(&zp->z_lock); 2798 vap->va_type = IFTOVT(zp->z_mode); 2799 vap->va_mode = zp->z_mode & ~S_IFMT; 2800#ifdef sun 2801 vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev; 2802#else 2803 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 2804#endif 2805 vap->va_nodeid = zp->z_id; 2806 if ((vp->v_flag & VROOT) && zfs_show_ctldir(zp)) 2807 links = zp->z_links + 1; 2808 else 2809 links = zp->z_links; 2810 vap->va_nlink = MIN(links, LINK_MAX); /* nlink_t limit! */ 2811 vap->va_size = zp->z_size; 2812#ifdef sun 2813 vap->va_rdev = vp->v_rdev; 2814#else 2815 if (vp->v_type == VBLK || vp->v_type == VCHR) 2816 vap->va_rdev = zfs_cmpldev(rdev); 2817#endif 2818 vap->va_seq = zp->z_seq; 2819 vap->va_flags = 0; /* FreeBSD: Reset chflags(2) flags. */ 2820 2821 /* 2822 * Add in any requested optional attributes and the create time. 2823 * Also set the corresponding bits in the returned attribute bitmap. 2824 */ 2825 if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) { 2826 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 2827 xoap->xoa_archive = 2828 ((zp->z_pflags & ZFS_ARCHIVE) != 0); 2829 XVA_SET_RTN(xvap, XAT_ARCHIVE); 2830 } 2831 2832 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 2833 xoap->xoa_readonly = 2834 ((zp->z_pflags & ZFS_READONLY) != 0); 2835 XVA_SET_RTN(xvap, XAT_READONLY); 2836 } 2837 2838 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 2839 xoap->xoa_system = 2840 ((zp->z_pflags & ZFS_SYSTEM) != 0); 2841 XVA_SET_RTN(xvap, XAT_SYSTEM); 2842 } 2843 2844 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 2845 xoap->xoa_hidden = 2846 ((zp->z_pflags & ZFS_HIDDEN) != 0); 2847 XVA_SET_RTN(xvap, XAT_HIDDEN); 2848 } 2849 2850 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 2851 xoap->xoa_nounlink = 2852 ((zp->z_pflags & ZFS_NOUNLINK) != 0); 2853 XVA_SET_RTN(xvap, XAT_NOUNLINK); 2854 } 2855 2856 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 2857 xoap->xoa_immutable = 2858 ((zp->z_pflags & ZFS_IMMUTABLE) != 0); 2859 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 2860 } 2861 2862 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 2863 xoap->xoa_appendonly = 2864 ((zp->z_pflags & ZFS_APPENDONLY) != 0); 2865 XVA_SET_RTN(xvap, XAT_APPENDONLY); 2866 } 2867 2868 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 2869 xoap->xoa_nodump = 2870 ((zp->z_pflags & ZFS_NODUMP) != 0); 2871 XVA_SET_RTN(xvap, XAT_NODUMP); 2872 } 2873 2874 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 2875 xoap->xoa_opaque = 2876 ((zp->z_pflags & ZFS_OPAQUE) != 0); 2877 XVA_SET_RTN(xvap, XAT_OPAQUE); 2878 } 2879 2880 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 2881 xoap->xoa_av_quarantined = 2882 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0); 2883 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 2884 } 2885 2886 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 2887 xoap->xoa_av_modified = 2888 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0); 2889 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 2890 } 2891 2892 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) && 2893 vp->v_type == VREG) { 2894 zfs_sa_get_scanstamp(zp, xvap); 2895 } 2896 2897 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 2898 uint64_t times[2]; 2899 2900 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs), 2901 times, sizeof (times)); 2902 ZFS_TIME_DECODE(&xoap->xoa_createtime, times); 2903 XVA_SET_RTN(xvap, XAT_CREATETIME); 2904 } 2905 2906 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 2907 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0); 2908 XVA_SET_RTN(xvap, XAT_REPARSE); 2909 } 2910 if (XVA_ISSET_REQ(xvap, XAT_GEN)) { 2911 xoap->xoa_generation = zp->z_gen; 2912 XVA_SET_RTN(xvap, XAT_GEN); 2913 } 2914 2915 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 2916 xoap->xoa_offline = 2917 ((zp->z_pflags & ZFS_OFFLINE) != 0); 2918 XVA_SET_RTN(xvap, XAT_OFFLINE); 2919 } 2920 2921 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 2922 xoap->xoa_sparse = 2923 ((zp->z_pflags & ZFS_SPARSE) != 0); 2924 XVA_SET_RTN(xvap, XAT_SPARSE); 2925 } 2926 } 2927 2928 ZFS_TIME_DECODE(&vap->va_atime, zp->z_atime); 2929 ZFS_TIME_DECODE(&vap->va_mtime, mtime); 2930 ZFS_TIME_DECODE(&vap->va_ctime, ctime); 2931 ZFS_TIME_DECODE(&vap->va_birthtime, crtime); 2932 2933 mutex_exit(&zp->z_lock); 2934 2935 sa_object_size(zp->z_sa_hdl, &blksize, &nblocks); 2936 vap->va_blksize = blksize; 2937 vap->va_bytes = nblocks << 9; /* nblocks * 512 */ 2938 2939 if (zp->z_blksz == 0) { 2940 /* 2941 * Block size hasn't been set; suggest maximal I/O transfers. 2942 */ 2943 vap->va_blksize = zfsvfs->z_max_blksz; 2944 } 2945 2946 ZFS_EXIT(zfsvfs); 2947 return (0); 2948} 2949 2950/* 2951 * Set the file attributes to the values contained in the 2952 * vattr structure. 2953 * 2954 * IN: vp - vnode of file to be modified. 2955 * vap - new attribute values. 2956 * If AT_XVATTR set, then optional attrs are being set 2957 * flags - ATTR_UTIME set if non-default time values provided. 2958 * - ATTR_NOACLCHECK (CIFS context only). 2959 * cr - credentials of caller. 2960 * ct - caller context 2961 * 2962 * RETURN: 0 on success, error code on failure. 2963 * 2964 * Timestamps: 2965 * vp - ctime updated, mtime updated if size changed. 2966 */ 2967/* ARGSUSED */ 2968static int 2969zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 2970 caller_context_t *ct) 2971{ 2972 znode_t *zp = VTOZ(vp); 2973 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2974 zilog_t *zilog; 2975 dmu_tx_t *tx; 2976 vattr_t oldva; 2977 xvattr_t tmpxvattr; 2978 uint_t mask = vap->va_mask; 2979 uint_t saved_mask = 0; 2980 uint64_t saved_mode; 2981 int trim_mask = 0; 2982 uint64_t new_mode; 2983 uint64_t new_uid, new_gid; 2984 uint64_t xattr_obj; 2985 uint64_t mtime[2], ctime[2]; 2986 znode_t *attrzp; 2987 int need_policy = FALSE; 2988 int err, err2; 2989 zfs_fuid_info_t *fuidp = NULL; 2990 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */ 2991 xoptattr_t *xoap; 2992 zfs_acl_t *aclp; 2993 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 2994 boolean_t fuid_dirtied = B_FALSE; 2995 sa_bulk_attr_t bulk[7], xattr_bulk[7]; 2996 int count = 0, xattr_count = 0; 2997 2998 if (mask == 0) 2999 return (0); 3000 3001 if (mask & AT_NOSET) 3002 return (SET_ERROR(EINVAL)); 3003 3004 ZFS_ENTER(zfsvfs); 3005 ZFS_VERIFY_ZP(zp); 3006 3007 zilog = zfsvfs->z_log; 3008 3009 /* 3010 * Make sure that if we have ephemeral uid/gid or xvattr specified 3011 * that file system is at proper version level 3012 */ 3013 3014 if (zfsvfs->z_use_fuids == B_FALSE && 3015 (((mask & AT_UID) && IS_EPHEMERAL(vap->va_uid)) || 3016 ((mask & AT_GID) && IS_EPHEMERAL(vap->va_gid)) || 3017 (mask & AT_XVATTR))) { 3018 ZFS_EXIT(zfsvfs); 3019 return (SET_ERROR(EINVAL)); 3020 } 3021 3022 if (mask & AT_SIZE && vp->v_type == VDIR) { 3023 ZFS_EXIT(zfsvfs); 3024 return (SET_ERROR(EISDIR)); 3025 } 3026 3027 if (mask & AT_SIZE && vp->v_type != VREG && vp->v_type != VFIFO) { 3028 ZFS_EXIT(zfsvfs); 3029 return (SET_ERROR(EINVAL)); 3030 } 3031 3032 /* 3033 * If this is an xvattr_t, then get a pointer to the structure of 3034 * optional attributes. If this is NULL, then we have a vattr_t. 3035 */ 3036 xoap = xva_getxoptattr(xvap); 3037 3038 xva_init(&tmpxvattr); 3039 3040 /* 3041 * Immutable files can only alter immutable bit and atime 3042 */ 3043 if ((zp->z_pflags & ZFS_IMMUTABLE) && 3044 ((mask & (AT_SIZE|AT_UID|AT_GID|AT_MTIME|AT_MODE)) || 3045 ((mask & AT_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) { 3046 ZFS_EXIT(zfsvfs); 3047 return (SET_ERROR(EPERM)); 3048 } 3049 3050 if ((mask & AT_SIZE) && (zp->z_pflags & ZFS_READONLY)) { 3051 ZFS_EXIT(zfsvfs); 3052 return (SET_ERROR(EPERM)); 3053 } 3054 3055 /* 3056 * Verify timestamps doesn't overflow 32 bits. 3057 * ZFS can handle large timestamps, but 32bit syscalls can't 3058 * handle times greater than 2039. This check should be removed 3059 * once large timestamps are fully supported. 3060 */ 3061 if (mask & (AT_ATIME | AT_MTIME)) { 3062 if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) || 3063 ((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) { 3064 ZFS_EXIT(zfsvfs); 3065 return (SET_ERROR(EOVERFLOW)); 3066 } 3067 } 3068 3069top: 3070 attrzp = NULL; 3071 aclp = NULL; 3072 3073 /* Can this be moved to before the top label? */ 3074 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { 3075 ZFS_EXIT(zfsvfs); 3076 return (SET_ERROR(EROFS)); 3077 } 3078 3079 /* 3080 * First validate permissions 3081 */ 3082 3083 if (mask & AT_SIZE) { 3084 /* 3085 * XXX - Note, we are not providing any open 3086 * mode flags here (like FNDELAY), so we may 3087 * block if there are locks present... this 3088 * should be addressed in openat(). 3089 */ 3090 /* XXX - would it be OK to generate a log record here? */ 3091 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE); 3092 if (err) { 3093 ZFS_EXIT(zfsvfs); 3094 return (err); 3095 } 3096 } 3097 3098 if (mask & (AT_ATIME|AT_MTIME) || 3099 ((mask & AT_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) || 3100 XVA_ISSET_REQ(xvap, XAT_READONLY) || 3101 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) || 3102 XVA_ISSET_REQ(xvap, XAT_OFFLINE) || 3103 XVA_ISSET_REQ(xvap, XAT_SPARSE) || 3104 XVA_ISSET_REQ(xvap, XAT_CREATETIME) || 3105 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) { 3106 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0, 3107 skipaclchk, cr); 3108 } 3109 3110 if (mask & (AT_UID|AT_GID)) { 3111 int idmask = (mask & (AT_UID|AT_GID)); 3112 int take_owner; 3113 int take_group; 3114 3115 /* 3116 * NOTE: even if a new mode is being set, 3117 * we may clear S_ISUID/S_ISGID bits. 3118 */ 3119 3120 if (!(mask & AT_MODE)) 3121 vap->va_mode = zp->z_mode; 3122 3123 /* 3124 * Take ownership or chgrp to group we are a member of 3125 */ 3126 3127 take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr)); 3128 take_group = (mask & AT_GID) && 3129 zfs_groupmember(zfsvfs, vap->va_gid, cr); 3130 3131 /* 3132 * If both AT_UID and AT_GID are set then take_owner and 3133 * take_group must both be set in order to allow taking 3134 * ownership. 3135 * 3136 * Otherwise, send the check through secpolicy_vnode_setattr() 3137 * 3138 */ 3139 3140 if (((idmask == (AT_UID|AT_GID)) && take_owner && take_group) || 3141 ((idmask == AT_UID) && take_owner) || 3142 ((idmask == AT_GID) && take_group)) { 3143 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0, 3144 skipaclchk, cr) == 0) { 3145 /* 3146 * Remove setuid/setgid for non-privileged users 3147 */ 3148 secpolicy_setid_clear(vap, vp, cr); 3149 trim_mask = (mask & (AT_UID|AT_GID)); 3150 } else { 3151 need_policy = TRUE; 3152 } 3153 } else { 3154 need_policy = TRUE; 3155 } 3156 } 3157 3158 mutex_enter(&zp->z_lock); 3159 oldva.va_mode = zp->z_mode; 3160 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid); 3161 if (mask & AT_XVATTR) { 3162 /* 3163 * Update xvattr mask to include only those attributes 3164 * that are actually changing. 3165 * 3166 * the bits will be restored prior to actually setting 3167 * the attributes so the caller thinks they were set. 3168 */ 3169 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 3170 if (xoap->xoa_appendonly != 3171 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) { 3172 need_policy = TRUE; 3173 } else { 3174 XVA_CLR_REQ(xvap, XAT_APPENDONLY); 3175 XVA_SET_REQ(&tmpxvattr, XAT_APPENDONLY); 3176 } 3177 } 3178 3179 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 3180 if (xoap->xoa_nounlink != 3181 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) { 3182 need_policy = TRUE; 3183 } else { 3184 XVA_CLR_REQ(xvap, XAT_NOUNLINK); 3185 XVA_SET_REQ(&tmpxvattr, XAT_NOUNLINK); 3186 } 3187 } 3188 3189 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 3190 if (xoap->xoa_immutable != 3191 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) { 3192 need_policy = TRUE; 3193 } else { 3194 XVA_CLR_REQ(xvap, XAT_IMMUTABLE); 3195 XVA_SET_REQ(&tmpxvattr, XAT_IMMUTABLE); 3196 } 3197 } 3198 3199 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 3200 if (xoap->xoa_nodump != 3201 ((zp->z_pflags & ZFS_NODUMP) != 0)) { 3202 need_policy = TRUE; 3203 } else { 3204 XVA_CLR_REQ(xvap, XAT_NODUMP); 3205 XVA_SET_REQ(&tmpxvattr, XAT_NODUMP); 3206 } 3207 } 3208 3209 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 3210 if (xoap->xoa_av_modified != 3211 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) { 3212 need_policy = TRUE; 3213 } else { 3214 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED); 3215 XVA_SET_REQ(&tmpxvattr, XAT_AV_MODIFIED); 3216 } 3217 } 3218 3219 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 3220 if ((vp->v_type != VREG && 3221 xoap->xoa_av_quarantined) || 3222 xoap->xoa_av_quarantined != 3223 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) { 3224 need_policy = TRUE; 3225 } else { 3226 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED); 3227 XVA_SET_REQ(&tmpxvattr, XAT_AV_QUARANTINED); 3228 } 3229 } 3230 3231 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 3232 mutex_exit(&zp->z_lock); 3233 ZFS_EXIT(zfsvfs); 3234 return (SET_ERROR(EPERM)); 3235 } 3236 3237 if (need_policy == FALSE && 3238 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) || 3239 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) { 3240 need_policy = TRUE; 3241 } 3242 } 3243 3244 mutex_exit(&zp->z_lock); 3245 3246 if (mask & AT_MODE) { 3247 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) { 3248 err = secpolicy_setid_setsticky_clear(vp, vap, 3249 &oldva, cr); 3250 if (err) { 3251 ZFS_EXIT(zfsvfs); 3252 return (err); 3253 } 3254 trim_mask |= AT_MODE; 3255 } else { 3256 need_policy = TRUE; 3257 } 3258 } 3259 3260 if (need_policy) { 3261 /* 3262 * If trim_mask is set then take ownership 3263 * has been granted or write_acl is present and user 3264 * has the ability to modify mode. In that case remove 3265 * UID|GID and or MODE from mask so that 3266 * secpolicy_vnode_setattr() doesn't revoke it. 3267 */ 3268 3269 if (trim_mask) { 3270 saved_mask = vap->va_mask; 3271 vap->va_mask &= ~trim_mask; 3272 if (trim_mask & AT_MODE) { 3273 /* 3274 * Save the mode, as secpolicy_vnode_setattr() 3275 * will overwrite it with ova.va_mode. 3276 */ 3277 saved_mode = vap->va_mode; 3278 } 3279 } 3280 err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags, 3281 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp); 3282 if (err) { 3283 ZFS_EXIT(zfsvfs); 3284 return (err); 3285 } 3286 3287 if (trim_mask) { 3288 vap->va_mask |= saved_mask; 3289 if (trim_mask & AT_MODE) { 3290 /* 3291 * Recover the mode after 3292 * secpolicy_vnode_setattr(). 3293 */ 3294 vap->va_mode = saved_mode; 3295 } 3296 } 3297 } 3298 3299 /* 3300 * secpolicy_vnode_setattr, or take ownership may have 3301 * changed va_mask 3302 */ 3303 mask = vap->va_mask; 3304 3305 if ((mask & (AT_UID | AT_GID))) { 3306 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 3307 &xattr_obj, sizeof (xattr_obj)); 3308 3309 if (err == 0 && xattr_obj) { 3310 err = zfs_zget(zp->z_zfsvfs, xattr_obj, &attrzp); 3311 if (err) 3312 goto out2; 3313 } 3314 if (mask & AT_UID) { 3315 new_uid = zfs_fuid_create(zfsvfs, 3316 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp); 3317 if (new_uid != zp->z_uid && 3318 zfs_fuid_overquota(zfsvfs, B_FALSE, new_uid)) { 3319 if (attrzp) 3320 VN_RELE(ZTOV(attrzp)); 3321 err = SET_ERROR(EDQUOT); 3322 goto out2; 3323 } 3324 } 3325 3326 if (mask & AT_GID) { 3327 new_gid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid, 3328 cr, ZFS_GROUP, &fuidp); 3329 if (new_gid != zp->z_gid && 3330 zfs_fuid_overquota(zfsvfs, B_TRUE, new_gid)) { 3331 if (attrzp) 3332 VN_RELE(ZTOV(attrzp)); 3333 err = SET_ERROR(EDQUOT); 3334 goto out2; 3335 } 3336 } 3337 } 3338 tx = dmu_tx_create(zfsvfs->z_os); 3339 3340 if (mask & AT_MODE) { 3341 uint64_t pmode = zp->z_mode; 3342 uint64_t acl_obj; 3343 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT); 3344 3345 if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED && 3346 !(zp->z_pflags & ZFS_ACL_TRIVIAL)) { 3347 err = SET_ERROR(EPERM); 3348 goto out; 3349 } 3350 3351 if (err = zfs_acl_chmod_setattr(zp, &aclp, new_mode)) 3352 goto out; 3353 3354 mutex_enter(&zp->z_lock); 3355 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) { 3356 /* 3357 * Are we upgrading ACL from old V0 format 3358 * to V1 format? 3359 */ 3360 if (zfsvfs->z_version >= ZPL_VERSION_FUID && 3361 zfs_znode_acl_version(zp) == 3362 ZFS_ACL_VERSION_INITIAL) { 3363 dmu_tx_hold_free(tx, acl_obj, 0, 3364 DMU_OBJECT_END); 3365 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 3366 0, aclp->z_acl_bytes); 3367 } else { 3368 dmu_tx_hold_write(tx, acl_obj, 0, 3369 aclp->z_acl_bytes); 3370 } 3371 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) { 3372 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 3373 0, aclp->z_acl_bytes); 3374 } 3375 mutex_exit(&zp->z_lock); 3376 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 3377 } else { 3378 if ((mask & AT_XVATTR) && 3379 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) 3380 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 3381 else 3382 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 3383 } 3384 3385 if (attrzp) { 3386 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE); 3387 } 3388 3389 fuid_dirtied = zfsvfs->z_fuid_dirty; 3390 if (fuid_dirtied) 3391 zfs_fuid_txhold(zfsvfs, tx); 3392 3393 zfs_sa_upgrade_txholds(tx, zp); 3394 3395 err = dmu_tx_assign(tx, TXG_WAIT); 3396 if (err) 3397 goto out; 3398 3399 count = 0; 3400 /* 3401 * Set each attribute requested. 3402 * We group settings according to the locks they need to acquire. 3403 * 3404 * Note: you cannot set ctime directly, although it will be 3405 * updated as a side-effect of calling this function. 3406 */ 3407 3408 3409 if (mask & (AT_UID|AT_GID|AT_MODE)) 3410 mutex_enter(&zp->z_acl_lock); 3411 mutex_enter(&zp->z_lock); 3412 3413 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 3414 &zp->z_pflags, sizeof (zp->z_pflags)); 3415 3416 if (attrzp) { 3417 if (mask & (AT_UID|AT_GID|AT_MODE)) 3418 mutex_enter(&attrzp->z_acl_lock); 3419 mutex_enter(&attrzp->z_lock); 3420 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3421 SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags, 3422 sizeof (attrzp->z_pflags)); 3423 } 3424 3425 if (mask & (AT_UID|AT_GID)) { 3426 3427 if (mask & AT_UID) { 3428 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 3429 &new_uid, sizeof (new_uid)); 3430 zp->z_uid = new_uid; 3431 if (attrzp) { 3432 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3433 SA_ZPL_UID(zfsvfs), NULL, &new_uid, 3434 sizeof (new_uid)); 3435 attrzp->z_uid = new_uid; 3436 } 3437 } 3438 3439 if (mask & AT_GID) { 3440 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), 3441 NULL, &new_gid, sizeof (new_gid)); 3442 zp->z_gid = new_gid; 3443 if (attrzp) { 3444 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3445 SA_ZPL_GID(zfsvfs), NULL, &new_gid, 3446 sizeof (new_gid)); 3447 attrzp->z_gid = new_gid; 3448 } 3449 } 3450 if (!(mask & AT_MODE)) { 3451 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), 3452 NULL, &new_mode, sizeof (new_mode)); 3453 new_mode = zp->z_mode; 3454 } 3455 err = zfs_acl_chown_setattr(zp); 3456 ASSERT(err == 0); 3457 if (attrzp) { 3458 err = zfs_acl_chown_setattr(attrzp); 3459 ASSERT(err == 0); 3460 } 3461 } 3462 3463 if (mask & AT_MODE) { 3464 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 3465 &new_mode, sizeof (new_mode)); 3466 zp->z_mode = new_mode; 3467 ASSERT3U((uintptr_t)aclp, !=, 0); 3468 err = zfs_aclset_common(zp, aclp, cr, tx); 3469 ASSERT0(err); 3470 if (zp->z_acl_cached) 3471 zfs_acl_free(zp->z_acl_cached); 3472 zp->z_acl_cached = aclp; 3473 aclp = NULL; 3474 } 3475 3476 3477 if (mask & AT_ATIME) { 3478 ZFS_TIME_ENCODE(&vap->va_atime, zp->z_atime); 3479 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 3480 &zp->z_atime, sizeof (zp->z_atime)); 3481 } 3482 3483 if (mask & AT_MTIME) { 3484 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 3485 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 3486 mtime, sizeof (mtime)); 3487 } 3488 3489 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */ 3490 if (mask & AT_SIZE && !(mask & AT_MTIME)) { 3491 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), 3492 NULL, mtime, sizeof (mtime)); 3493 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 3494 &ctime, sizeof (ctime)); 3495 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 3496 B_TRUE); 3497 } else if (mask != 0) { 3498 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 3499 &ctime, sizeof (ctime)); 3500 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime, 3501 B_TRUE); 3502 if (attrzp) { 3503 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3504 SA_ZPL_CTIME(zfsvfs), NULL, 3505 &ctime, sizeof (ctime)); 3506 zfs_tstamp_update_setup(attrzp, STATE_CHANGED, 3507 mtime, ctime, B_TRUE); 3508 } 3509 } 3510 /* 3511 * Do this after setting timestamps to prevent timestamp 3512 * update from toggling bit 3513 */ 3514 3515 if (xoap && (mask & AT_XVATTR)) { 3516 3517 /* 3518 * restore trimmed off masks 3519 * so that return masks can be set for caller. 3520 */ 3521 3522 if (XVA_ISSET_REQ(&tmpxvattr, XAT_APPENDONLY)) { 3523 XVA_SET_REQ(xvap, XAT_APPENDONLY); 3524 } 3525 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NOUNLINK)) { 3526 XVA_SET_REQ(xvap, XAT_NOUNLINK); 3527 } 3528 if (XVA_ISSET_REQ(&tmpxvattr, XAT_IMMUTABLE)) { 3529 XVA_SET_REQ(xvap, XAT_IMMUTABLE); 3530 } 3531 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NODUMP)) { 3532 XVA_SET_REQ(xvap, XAT_NODUMP); 3533 } 3534 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_MODIFIED)) { 3535 XVA_SET_REQ(xvap, XAT_AV_MODIFIED); 3536 } 3537 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_QUARANTINED)) { 3538 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED); 3539 } 3540 3541 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) 3542 ASSERT(vp->v_type == VREG); 3543 3544 zfs_xvattr_set(zp, xvap, tx); 3545 } 3546 3547 if (fuid_dirtied) 3548 zfs_fuid_sync(zfsvfs, tx); 3549 3550 if (mask != 0) 3551 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp); 3552 3553 mutex_exit(&zp->z_lock); 3554 if (mask & (AT_UID|AT_GID|AT_MODE)) 3555 mutex_exit(&zp->z_acl_lock); 3556 3557 if (attrzp) { 3558 if (mask & (AT_UID|AT_GID|AT_MODE)) 3559 mutex_exit(&attrzp->z_acl_lock); 3560 mutex_exit(&attrzp->z_lock); 3561 } 3562out: 3563 if (err == 0 && attrzp) { 3564 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk, 3565 xattr_count, tx); 3566 ASSERT(err2 == 0); 3567 } 3568 3569 if (attrzp) 3570 VN_RELE(ZTOV(attrzp)); 3571 3572 if (aclp) 3573 zfs_acl_free(aclp); 3574 3575 if (fuidp) { 3576 zfs_fuid_info_free(fuidp); 3577 fuidp = NULL; 3578 } 3579 3580 if (err) { 3581 dmu_tx_abort(tx); 3582 if (err == ERESTART) 3583 goto top; 3584 } else { 3585 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 3586 dmu_tx_commit(tx); 3587 } 3588 3589out2: 3590 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 3591 zil_commit(zilog, 0); 3592 3593 ZFS_EXIT(zfsvfs); 3594 return (err); 3595} 3596 3597typedef struct zfs_zlock { 3598 krwlock_t *zl_rwlock; /* lock we acquired */ 3599 znode_t *zl_znode; /* znode we held */ 3600 struct zfs_zlock *zl_next; /* next in list */ 3601} zfs_zlock_t; 3602 3603/* 3604 * Drop locks and release vnodes that were held by zfs_rename_lock(). 3605 */ 3606static void 3607zfs_rename_unlock(zfs_zlock_t **zlpp) 3608{ 3609 zfs_zlock_t *zl; 3610 3611 while ((zl = *zlpp) != NULL) { 3612 if (zl->zl_znode != NULL) 3613 VN_RELE(ZTOV(zl->zl_znode)); 3614 rw_exit(zl->zl_rwlock); 3615 *zlpp = zl->zl_next; 3616 kmem_free(zl, sizeof (*zl)); 3617 } 3618} 3619 3620/* 3621 * Search back through the directory tree, using the ".." entries. 3622 * Lock each directory in the chain to prevent concurrent renames. 3623 * Fail any attempt to move a directory into one of its own descendants. 3624 * XXX - z_parent_lock can overlap with map or grow locks 3625 */ 3626static int 3627zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp) 3628{ 3629 zfs_zlock_t *zl; 3630 znode_t *zp = tdzp; 3631 uint64_t rootid = zp->z_zfsvfs->z_root; 3632 uint64_t oidp = zp->z_id; 3633 krwlock_t *rwlp = &szp->z_parent_lock; 3634 krw_t rw = RW_WRITER; 3635 3636 /* 3637 * First pass write-locks szp and compares to zp->z_id. 3638 * Later passes read-lock zp and compare to zp->z_parent. 3639 */ 3640 do { 3641 if (!rw_tryenter(rwlp, rw)) { 3642 /* 3643 * Another thread is renaming in this path. 3644 * Note that if we are a WRITER, we don't have any 3645 * parent_locks held yet. 3646 */ 3647 if (rw == RW_READER && zp->z_id > szp->z_id) { 3648 /* 3649 * Drop our locks and restart 3650 */ 3651 zfs_rename_unlock(&zl); 3652 *zlpp = NULL; 3653 zp = tdzp; 3654 oidp = zp->z_id; 3655 rwlp = &szp->z_parent_lock; 3656 rw = RW_WRITER; 3657 continue; 3658 } else { 3659 /* 3660 * Wait for other thread to drop its locks 3661 */ 3662 rw_enter(rwlp, rw); 3663 } 3664 } 3665 3666 zl = kmem_alloc(sizeof (*zl), KM_SLEEP); 3667 zl->zl_rwlock = rwlp; 3668 zl->zl_znode = NULL; 3669 zl->zl_next = *zlpp; 3670 *zlpp = zl; 3671 3672 if (oidp == szp->z_id) /* We're a descendant of szp */ 3673 return (SET_ERROR(EINVAL)); 3674 3675 if (oidp == rootid) /* We've hit the top */ 3676 return (0); 3677 3678 if (rw == RW_READER) { /* i.e. not the first pass */ 3679 int error = zfs_zget(zp->z_zfsvfs, oidp, &zp); 3680 if (error) 3681 return (error); 3682 zl->zl_znode = zp; 3683 } 3684 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zp->z_zfsvfs), 3685 &oidp, sizeof (oidp)); 3686 rwlp = &zp->z_parent_lock; 3687 rw = RW_READER; 3688 3689 } while (zp->z_id != sdzp->z_id); 3690 3691 return (0); 3692} 3693 3694/* 3695 * Move an entry from the provided source directory to the target 3696 * directory. Change the entry name as indicated. 3697 * 3698 * IN: sdvp - Source directory containing the "old entry". 3699 * snm - Old entry name. 3700 * tdvp - Target directory to contain the "new entry". 3701 * tnm - New entry name. 3702 * cr - credentials of caller. 3703 * ct - caller context 3704 * flags - case flags 3705 * 3706 * RETURN: 0 on success, error code on failure. 3707 * 3708 * Timestamps: 3709 * sdvp,tdvp - ctime|mtime updated 3710 */ 3711/*ARGSUSED*/ 3712static int 3713zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr, 3714 caller_context_t *ct, int flags) 3715{ 3716 znode_t *tdzp, *szp, *tzp; 3717 znode_t *sdzp = VTOZ(sdvp); 3718 zfsvfs_t *zfsvfs = sdzp->z_zfsvfs; 3719 zilog_t *zilog; 3720 vnode_t *realvp; 3721 zfs_dirlock_t *sdl, *tdl; 3722 dmu_tx_t *tx; 3723 zfs_zlock_t *zl; 3724 int cmp, serr, terr; 3725 int error = 0; 3726 int zflg = 0; 3727 boolean_t waited = B_FALSE; 3728 3729 ZFS_ENTER(zfsvfs); 3730 ZFS_VERIFY_ZP(sdzp); 3731 zilog = zfsvfs->z_log; 3732 3733 /* 3734 * Make sure we have the real vp for the target directory. 3735 */ 3736 if (VOP_REALVP(tdvp, &realvp, ct) == 0) 3737 tdvp = realvp; 3738 3739 tdzp = VTOZ(tdvp); 3740 ZFS_VERIFY_ZP(tdzp); 3741 3742 /* 3743 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the 3744 * ctldir appear to have the same v_vfsp. 3745 */ 3746 if (tdzp->z_zfsvfs != zfsvfs || zfsctl_is_node(tdvp)) { 3747 ZFS_EXIT(zfsvfs); 3748 return (SET_ERROR(EXDEV)); 3749 } 3750 3751 if (zfsvfs->z_utf8 && u8_validate(tnm, 3752 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 3753 ZFS_EXIT(zfsvfs); 3754 return (SET_ERROR(EILSEQ)); 3755 } 3756 3757 if (flags & FIGNORECASE) 3758 zflg |= ZCILOOK; 3759 3760top: 3761 szp = NULL; 3762 tzp = NULL; 3763 zl = NULL; 3764 3765 /* 3766 * This is to prevent the creation of links into attribute space 3767 * by renaming a linked file into/outof an attribute directory. 3768 * See the comment in zfs_link() for why this is considered bad. 3769 */ 3770 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) { 3771 ZFS_EXIT(zfsvfs); 3772 return (SET_ERROR(EINVAL)); 3773 } 3774 3775 /* 3776 * Lock source and target directory entries. To prevent deadlock, 3777 * a lock ordering must be defined. We lock the directory with 3778 * the smallest object id first, or if it's a tie, the one with 3779 * the lexically first name. 3780 */ 3781 if (sdzp->z_id < tdzp->z_id) { 3782 cmp = -1; 3783 } else if (sdzp->z_id > tdzp->z_id) { 3784 cmp = 1; 3785 } else { 3786 /* 3787 * First compare the two name arguments without 3788 * considering any case folding. 3789 */ 3790 int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER); 3791 3792 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error); 3793 ASSERT(error == 0 || !zfsvfs->z_utf8); 3794 if (cmp == 0) { 3795 /* 3796 * POSIX: "If the old argument and the new argument 3797 * both refer to links to the same existing file, 3798 * the rename() function shall return successfully 3799 * and perform no other action." 3800 */ 3801 ZFS_EXIT(zfsvfs); 3802 return (0); 3803 } 3804 /* 3805 * If the file system is case-folding, then we may 3806 * have some more checking to do. A case-folding file 3807 * system is either supporting mixed case sensitivity 3808 * access or is completely case-insensitive. Note 3809 * that the file system is always case preserving. 3810 * 3811 * In mixed sensitivity mode case sensitive behavior 3812 * is the default. FIGNORECASE must be used to 3813 * explicitly request case insensitive behavior. 3814 * 3815 * If the source and target names provided differ only 3816 * by case (e.g., a request to rename 'tim' to 'Tim'), 3817 * we will treat this as a special case in the 3818 * case-insensitive mode: as long as the source name 3819 * is an exact match, we will allow this to proceed as 3820 * a name-change request. 3821 */ 3822 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 3823 (zfsvfs->z_case == ZFS_CASE_MIXED && 3824 flags & FIGNORECASE)) && 3825 u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST, 3826 &error) == 0) { 3827 /* 3828 * case preserving rename request, require exact 3829 * name matches 3830 */ 3831 zflg |= ZCIEXACT; 3832 zflg &= ~ZCILOOK; 3833 } 3834 } 3835 3836 /* 3837 * If the source and destination directories are the same, we should 3838 * grab the z_name_lock of that directory only once. 3839 */ 3840 if (sdzp == tdzp) { 3841 zflg |= ZHAVELOCK; 3842 rw_enter(&sdzp->z_name_lock, RW_READER); 3843 } 3844 3845 if (cmp < 0) { 3846 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp, 3847 ZEXISTS | zflg, NULL, NULL); 3848 terr = zfs_dirent_lock(&tdl, 3849 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL); 3850 } else { 3851 terr = zfs_dirent_lock(&tdl, 3852 tdzp, tnm, &tzp, zflg, NULL, NULL); 3853 serr = zfs_dirent_lock(&sdl, 3854 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg, 3855 NULL, NULL); 3856 } 3857 3858 if (serr) { 3859 /* 3860 * Source entry invalid or not there. 3861 */ 3862 if (!terr) { 3863 zfs_dirent_unlock(tdl); 3864 if (tzp) 3865 VN_RELE(ZTOV(tzp)); 3866 } 3867 3868 if (sdzp == tdzp) 3869 rw_exit(&sdzp->z_name_lock); 3870 3871 /* 3872 * FreeBSD: In OpenSolaris they only check if rename source is 3873 * ".." here, because "." is handled in their lookup. This is 3874 * not the case for FreeBSD, so we check for "." explicitly. 3875 */ 3876 if (strcmp(snm, ".") == 0 || strcmp(snm, "..") == 0) 3877 serr = SET_ERROR(EINVAL); 3878 ZFS_EXIT(zfsvfs); 3879 return (serr); 3880 } 3881 if (terr) { 3882 zfs_dirent_unlock(sdl); 3883 VN_RELE(ZTOV(szp)); 3884 3885 if (sdzp == tdzp) 3886 rw_exit(&sdzp->z_name_lock); 3887 3888 if (strcmp(tnm, "..") == 0) 3889 terr = SET_ERROR(EINVAL); 3890 ZFS_EXIT(zfsvfs); 3891 return (terr); 3892 } 3893 3894 /* 3895 * Must have write access at the source to remove the old entry 3896 * and write access at the target to create the new entry. 3897 * Note that if target and source are the same, this can be 3898 * done in a single check. 3899 */ 3900 3901 if (error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)) 3902 goto out; 3903 3904 if (ZTOV(szp)->v_type == VDIR) { 3905 /* 3906 * Check to make sure rename is valid. 3907 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d 3908 */ 3909 if (error = zfs_rename_lock(szp, tdzp, sdzp, &zl)) 3910 goto out; 3911 } 3912 3913 /* 3914 * Does target exist? 3915 */ 3916 if (tzp) { 3917 /* 3918 * Source and target must be the same type. 3919 */ 3920 if (ZTOV(szp)->v_type == VDIR) { 3921 if (ZTOV(tzp)->v_type != VDIR) { 3922 error = SET_ERROR(ENOTDIR); 3923 goto out; 3924 } 3925 } else { 3926 if (ZTOV(tzp)->v_type == VDIR) { 3927 error = SET_ERROR(EISDIR); 3928 goto out; 3929 } 3930 } 3931 /* 3932 * POSIX dictates that when the source and target 3933 * entries refer to the same file object, rename 3934 * must do nothing and exit without error. 3935 */ 3936 if (szp->z_id == tzp->z_id) { 3937 error = 0; 3938 goto out; 3939 } 3940 } 3941 3942 vnevent_rename_src(ZTOV(szp), sdvp, snm, ct); 3943 if (tzp) 3944 vnevent_rename_dest(ZTOV(tzp), tdvp, tnm, ct); 3945 3946 /* 3947 * notify the target directory if it is not the same 3948 * as source directory. 3949 */ 3950 if (tdvp != sdvp) { 3951 vnevent_rename_dest_dir(tdvp, ct); 3952 } 3953 3954 tx = dmu_tx_create(zfsvfs->z_os); 3955 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE); 3956 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE); 3957 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm); 3958 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm); 3959 if (sdzp != tdzp) { 3960 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE); 3961 zfs_sa_upgrade_txholds(tx, tdzp); 3962 } 3963 if (tzp) { 3964 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE); 3965 zfs_sa_upgrade_txholds(tx, tzp); 3966 } 3967 3968 zfs_sa_upgrade_txholds(tx, szp); 3969 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 3970 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 3971 if (error) { 3972 if (zl != NULL) 3973 zfs_rename_unlock(&zl); 3974 zfs_dirent_unlock(sdl); 3975 zfs_dirent_unlock(tdl); 3976 3977 if (sdzp == tdzp) 3978 rw_exit(&sdzp->z_name_lock); 3979 3980 VN_RELE(ZTOV(szp)); 3981 if (tzp) 3982 VN_RELE(ZTOV(tzp)); 3983 if (error == ERESTART) { 3984 waited = B_TRUE; 3985 dmu_tx_wait(tx); 3986 dmu_tx_abort(tx); 3987 goto top; 3988 } 3989 dmu_tx_abort(tx); 3990 ZFS_EXIT(zfsvfs); 3991 return (error); 3992 } 3993 3994 if (tzp) /* Attempt to remove the existing target */ 3995 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL); 3996 3997 if (error == 0) { 3998 error = zfs_link_create(tdl, szp, tx, ZRENAMING); 3999 if (error == 0) { 4000 szp->z_pflags |= ZFS_AV_MODIFIED; 4001 4002 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs), 4003 (void *)&szp->z_pflags, sizeof (uint64_t), tx); 4004 ASSERT0(error); 4005 4006 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL); 4007 if (error == 0) { 4008 zfs_log_rename(zilog, tx, TX_RENAME | 4009 (flags & FIGNORECASE ? TX_CI : 0), sdzp, 4010 sdl->dl_name, tdzp, tdl->dl_name, szp); 4011 4012 /* 4013 * Update path information for the target vnode 4014 */ 4015 vn_renamepath(tdvp, ZTOV(szp), tnm, 4016 strlen(tnm)); 4017 } else { 4018 /* 4019 * At this point, we have successfully created 4020 * the target name, but have failed to remove 4021 * the source name. Since the create was done 4022 * with the ZRENAMING flag, there are 4023 * complications; for one, the link count is 4024 * wrong. The easiest way to deal with this 4025 * is to remove the newly created target, and 4026 * return the original error. This must 4027 * succeed; fortunately, it is very unlikely to 4028 * fail, since we just created it. 4029 */ 4030 VERIFY3U(zfs_link_destroy(tdl, szp, tx, 4031 ZRENAMING, NULL), ==, 0); 4032 } 4033 } 4034#ifdef FREEBSD_NAMECACHE 4035 if (error == 0) { 4036 cache_purge(sdvp); 4037 cache_purge(tdvp); 4038 cache_purge(ZTOV(szp)); 4039 if (tzp) 4040 cache_purge(ZTOV(tzp)); 4041 } 4042#endif 4043 } 4044 4045 dmu_tx_commit(tx); 4046out: 4047 if (zl != NULL) 4048 zfs_rename_unlock(&zl); 4049 4050 zfs_dirent_unlock(sdl); 4051 zfs_dirent_unlock(tdl); 4052 4053 if (sdzp == tdzp) 4054 rw_exit(&sdzp->z_name_lock); 4055 4056 4057 VN_RELE(ZTOV(szp)); 4058 if (tzp) 4059 VN_RELE(ZTOV(tzp)); 4060 4061 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4062 zil_commit(zilog, 0); 4063 4064 ZFS_EXIT(zfsvfs); 4065 4066 return (error); 4067} 4068 4069/* 4070 * Insert the indicated symbolic reference entry into the directory. 4071 * 4072 * IN: dvp - Directory to contain new symbolic link. 4073 * link - Name for new symlink entry. 4074 * vap - Attributes of new entry. 4075 * cr - credentials of caller. 4076 * ct - caller context 4077 * flags - case flags 4078 * 4079 * RETURN: 0 on success, error code on failure. 4080 * 4081 * Timestamps: 4082 * dvp - ctime|mtime updated 4083 */ 4084/*ARGSUSED*/ 4085static int 4086zfs_symlink(vnode_t *dvp, vnode_t **vpp, char *name, vattr_t *vap, char *link, 4087 cred_t *cr, kthread_t *td) 4088{ 4089 znode_t *zp, *dzp = VTOZ(dvp); 4090 zfs_dirlock_t *dl; 4091 dmu_tx_t *tx; 4092 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 4093 zilog_t *zilog; 4094 uint64_t len = strlen(link); 4095 int error; 4096 int zflg = ZNEW; 4097 zfs_acl_ids_t acl_ids; 4098 boolean_t fuid_dirtied; 4099 uint64_t txtype = TX_SYMLINK; 4100 boolean_t waited = B_FALSE; 4101 int flags = 0; 4102 4103 ASSERT(vap->va_type == VLNK); 4104 4105 ZFS_ENTER(zfsvfs); 4106 ZFS_VERIFY_ZP(dzp); 4107 zilog = zfsvfs->z_log; 4108 4109 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name), 4110 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 4111 ZFS_EXIT(zfsvfs); 4112 return (SET_ERROR(EILSEQ)); 4113 } 4114 if (flags & FIGNORECASE) 4115 zflg |= ZCILOOK; 4116 4117 if (len > MAXPATHLEN) { 4118 ZFS_EXIT(zfsvfs); 4119 return (SET_ERROR(ENAMETOOLONG)); 4120 } 4121 4122 if ((error = zfs_acl_ids_create(dzp, 0, 4123 vap, cr, NULL, &acl_ids)) != 0) { 4124 ZFS_EXIT(zfsvfs); 4125 return (error); 4126 } 4127 4128 getnewvnode_reserve(1); 4129 4130top: 4131 /* 4132 * Attempt to lock directory; fail if entry already exists. 4133 */ 4134 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL); 4135 if (error) { 4136 zfs_acl_ids_free(&acl_ids); 4137 getnewvnode_drop_reserve(); 4138 ZFS_EXIT(zfsvfs); 4139 return (error); 4140 } 4141 4142 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 4143 zfs_acl_ids_free(&acl_ids); 4144 zfs_dirent_unlock(dl); 4145 getnewvnode_drop_reserve(); 4146 ZFS_EXIT(zfsvfs); 4147 return (error); 4148 } 4149 4150 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 4151 zfs_acl_ids_free(&acl_ids); 4152 zfs_dirent_unlock(dl); 4153 getnewvnode_drop_reserve(); 4154 ZFS_EXIT(zfsvfs); 4155 return (SET_ERROR(EDQUOT)); 4156 } 4157 tx = dmu_tx_create(zfsvfs->z_os); 4158 fuid_dirtied = zfsvfs->z_fuid_dirty; 4159 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len)); 4160 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 4161 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 4162 ZFS_SA_BASE_ATTR_SIZE + len); 4163 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); 4164 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 4165 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 4166 acl_ids.z_aclp->z_acl_bytes); 4167 } 4168 if (fuid_dirtied) 4169 zfs_fuid_txhold(zfsvfs, tx); 4170 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 4171 if (error) { 4172 zfs_dirent_unlock(dl); 4173 if (error == ERESTART) { 4174 waited = B_TRUE; 4175 dmu_tx_wait(tx); 4176 dmu_tx_abort(tx); 4177 goto top; 4178 } 4179 zfs_acl_ids_free(&acl_ids); 4180 dmu_tx_abort(tx); 4181 getnewvnode_drop_reserve(); 4182 ZFS_EXIT(zfsvfs); 4183 return (error); 4184 } 4185 4186 /* 4187 * Create a new object for the symlink. 4188 * for version 4 ZPL datsets the symlink will be an SA attribute 4189 */ 4190 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 4191 4192 if (fuid_dirtied) 4193 zfs_fuid_sync(zfsvfs, tx); 4194 4195 mutex_enter(&zp->z_lock); 4196 if (zp->z_is_sa) 4197 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs), 4198 link, len, tx); 4199 else 4200 zfs_sa_symlink(zp, link, len, tx); 4201 mutex_exit(&zp->z_lock); 4202 4203 zp->z_size = len; 4204 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs), 4205 &zp->z_size, sizeof (zp->z_size), tx); 4206 /* 4207 * Insert the new object into the directory. 4208 */ 4209 (void) zfs_link_create(dl, zp, tx, ZNEW); 4210 4211 if (flags & FIGNORECASE) 4212 txtype |= TX_CI; 4213 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link); 4214 *vpp = ZTOV(zp); 4215 4216 zfs_acl_ids_free(&acl_ids); 4217 4218 dmu_tx_commit(tx); 4219 4220 getnewvnode_drop_reserve(); 4221 4222 zfs_dirent_unlock(dl); 4223 4224 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4225 zil_commit(zilog, 0); 4226 4227 ZFS_EXIT(zfsvfs); 4228 return (error); 4229} 4230 4231/* 4232 * Return, in the buffer contained in the provided uio structure, 4233 * the symbolic path referred to by vp. 4234 * 4235 * IN: vp - vnode of symbolic link. 4236 * uio - structure to contain the link path. 4237 * cr - credentials of caller. 4238 * ct - caller context 4239 * 4240 * OUT: uio - structure containing the link path. 4241 * 4242 * RETURN: 0 on success, error code on failure. 4243 * 4244 * Timestamps: 4245 * vp - atime updated 4246 */ 4247/* ARGSUSED */ 4248static int 4249zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr, caller_context_t *ct) 4250{ 4251 znode_t *zp = VTOZ(vp); 4252 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4253 int error; 4254 4255 ZFS_ENTER(zfsvfs); 4256 ZFS_VERIFY_ZP(zp); 4257 4258 mutex_enter(&zp->z_lock); 4259 if (zp->z_is_sa) 4260 error = sa_lookup_uio(zp->z_sa_hdl, 4261 SA_ZPL_SYMLINK(zfsvfs), uio); 4262 else 4263 error = zfs_sa_readlink(zp, uio); 4264 mutex_exit(&zp->z_lock); 4265 4266 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 4267 4268 ZFS_EXIT(zfsvfs); 4269 return (error); 4270} 4271 4272/* 4273 * Insert a new entry into directory tdvp referencing svp. 4274 * 4275 * IN: tdvp - Directory to contain new entry. 4276 * svp - vnode of new entry. 4277 * name - name of new entry. 4278 * cr - credentials of caller. 4279 * ct - caller context 4280 * 4281 * RETURN: 0 on success, error code on failure. 4282 * 4283 * Timestamps: 4284 * tdvp - ctime|mtime updated 4285 * svp - ctime updated 4286 */ 4287/* ARGSUSED */ 4288static int 4289zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr, 4290 caller_context_t *ct, int flags) 4291{ 4292 znode_t *dzp = VTOZ(tdvp); 4293 znode_t *tzp, *szp; 4294 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 4295 zilog_t *zilog; 4296 zfs_dirlock_t *dl; 4297 dmu_tx_t *tx; 4298 vnode_t *realvp; 4299 int error; 4300 int zf = ZNEW; 4301 uint64_t parent; 4302 uid_t owner; 4303 boolean_t waited = B_FALSE; 4304 4305 ASSERT(tdvp->v_type == VDIR); 4306 4307 ZFS_ENTER(zfsvfs); 4308 ZFS_VERIFY_ZP(dzp); 4309 zilog = zfsvfs->z_log; 4310 4311 if (VOP_REALVP(svp, &realvp, ct) == 0) 4312 svp = realvp; 4313 4314 /* 4315 * POSIX dictates that we return EPERM here. 4316 * Better choices include ENOTSUP or EISDIR. 4317 */ 4318 if (svp->v_type == VDIR) { 4319 ZFS_EXIT(zfsvfs); 4320 return (SET_ERROR(EPERM)); 4321 } 4322 4323 szp = VTOZ(svp); 4324 ZFS_VERIFY_ZP(szp); 4325 4326 /* 4327 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the 4328 * ctldir appear to have the same v_vfsp. 4329 */ 4330 if (szp->z_zfsvfs != zfsvfs || zfsctl_is_node(svp)) { 4331 ZFS_EXIT(zfsvfs); 4332 return (SET_ERROR(EXDEV)); 4333 } 4334 4335 /* Prevent links to .zfs/shares files */ 4336 4337 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), 4338 &parent, sizeof (uint64_t))) != 0) { 4339 ZFS_EXIT(zfsvfs); 4340 return (error); 4341 } 4342 if (parent == zfsvfs->z_shares_dir) { 4343 ZFS_EXIT(zfsvfs); 4344 return (SET_ERROR(EPERM)); 4345 } 4346 4347 if (zfsvfs->z_utf8 && u8_validate(name, 4348 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 4349 ZFS_EXIT(zfsvfs); 4350 return (SET_ERROR(EILSEQ)); 4351 } 4352 if (flags & FIGNORECASE) 4353 zf |= ZCILOOK; 4354 4355 /* 4356 * We do not support links between attributes and non-attributes 4357 * because of the potential security risk of creating links 4358 * into "normal" file space in order to circumvent restrictions 4359 * imposed in attribute space. 4360 */ 4361 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) { 4362 ZFS_EXIT(zfsvfs); 4363 return (SET_ERROR(EINVAL)); 4364 } 4365 4366 4367 owner = zfs_fuid_map_id(zfsvfs, szp->z_uid, cr, ZFS_OWNER); 4368 if (owner != crgetuid(cr) && secpolicy_basic_link(svp, cr) != 0) { 4369 ZFS_EXIT(zfsvfs); 4370 return (SET_ERROR(EPERM)); 4371 } 4372 4373 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 4374 ZFS_EXIT(zfsvfs); 4375 return (error); 4376 } 4377 4378top: 4379 /* 4380 * Attempt to lock directory; fail if entry already exists. 4381 */ 4382 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL); 4383 if (error) { 4384 ZFS_EXIT(zfsvfs); 4385 return (error); 4386 } 4387 4388 tx = dmu_tx_create(zfsvfs->z_os); 4389 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE); 4390 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 4391 zfs_sa_upgrade_txholds(tx, szp); 4392 zfs_sa_upgrade_txholds(tx, dzp); 4393 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 4394 if (error) { 4395 zfs_dirent_unlock(dl); 4396 if (error == ERESTART) { 4397 waited = B_TRUE; 4398 dmu_tx_wait(tx); 4399 dmu_tx_abort(tx); 4400 goto top; 4401 } 4402 dmu_tx_abort(tx); 4403 ZFS_EXIT(zfsvfs); 4404 return (error); 4405 } 4406 4407 error = zfs_link_create(dl, szp, tx, 0); 4408 4409 if (error == 0) { 4410 uint64_t txtype = TX_LINK; 4411 if (flags & FIGNORECASE) 4412 txtype |= TX_CI; 4413 zfs_log_link(zilog, tx, txtype, dzp, szp, name); 4414 } 4415 4416 dmu_tx_commit(tx); 4417 4418 zfs_dirent_unlock(dl); 4419 4420 if (error == 0) { 4421 vnevent_link(svp, ct); 4422 } 4423 4424 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4425 zil_commit(zilog, 0); 4426 4427 ZFS_EXIT(zfsvfs); 4428 return (error); 4429} 4430 4431#ifdef sun 4432/* 4433 * zfs_null_putapage() is used when the file system has been force 4434 * unmounted. It just drops the pages. 4435 */ 4436/* ARGSUSED */ 4437static int 4438zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 4439 size_t *lenp, int flags, cred_t *cr) 4440{ 4441 pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR); 4442 return (0); 4443} 4444 4445/* 4446 * Push a page out to disk, klustering if possible. 4447 * 4448 * IN: vp - file to push page to. 4449 * pp - page to push. 4450 * flags - additional flags. 4451 * cr - credentials of caller. 4452 * 4453 * OUT: offp - start of range pushed. 4454 * lenp - len of range pushed. 4455 * 4456 * RETURN: 0 on success, error code on failure. 4457 * 4458 * NOTE: callers must have locked the page to be pushed. On 4459 * exit, the page (and all other pages in the kluster) must be 4460 * unlocked. 4461 */ 4462/* ARGSUSED */ 4463static int 4464zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 4465 size_t *lenp, int flags, cred_t *cr) 4466{ 4467 znode_t *zp = VTOZ(vp); 4468 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4469 dmu_tx_t *tx; 4470 u_offset_t off, koff; 4471 size_t len, klen; 4472 int err; 4473 4474 off = pp->p_offset; 4475 len = PAGESIZE; 4476 /* 4477 * If our blocksize is bigger than the page size, try to kluster 4478 * multiple pages so that we write a full block (thus avoiding 4479 * a read-modify-write). 4480 */ 4481 if (off < zp->z_size && zp->z_blksz > PAGESIZE) { 4482 klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE); 4483 koff = ISP2(klen) ? P2ALIGN(off, (u_offset_t)klen) : 0; 4484 ASSERT(koff <= zp->z_size); 4485 if (koff + klen > zp->z_size) 4486 klen = P2ROUNDUP(zp->z_size - koff, (uint64_t)PAGESIZE); 4487 pp = pvn_write_kluster(vp, pp, &off, &len, koff, klen, flags); 4488 } 4489 ASSERT3U(btop(len), ==, btopr(len)); 4490 4491 /* 4492 * Can't push pages past end-of-file. 4493 */ 4494 if (off >= zp->z_size) { 4495 /* ignore all pages */ 4496 err = 0; 4497 goto out; 4498 } else if (off + len > zp->z_size) { 4499 int npages = btopr(zp->z_size - off); 4500 page_t *trunc; 4501 4502 page_list_break(&pp, &trunc, npages); 4503 /* ignore pages past end of file */ 4504 if (trunc) 4505 pvn_write_done(trunc, flags); 4506 len = zp->z_size - off; 4507 } 4508 4509 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 4510 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 4511 err = SET_ERROR(EDQUOT); 4512 goto out; 4513 } 4514 tx = dmu_tx_create(zfsvfs->z_os); 4515 dmu_tx_hold_write(tx, zp->z_id, off, len); 4516 4517 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 4518 zfs_sa_upgrade_txholds(tx, zp); 4519 err = dmu_tx_assign(tx, TXG_WAIT); 4520 if (err != 0) { 4521 dmu_tx_abort(tx); 4522 goto out; 4523 } 4524 4525 if (zp->z_blksz <= PAGESIZE) { 4526 caddr_t va = zfs_map_page(pp, S_READ); 4527 ASSERT3U(len, <=, PAGESIZE); 4528 dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx); 4529 zfs_unmap_page(pp, va); 4530 } else { 4531 err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, pp, tx); 4532 } 4533 4534 if (err == 0) { 4535 uint64_t mtime[2], ctime[2]; 4536 sa_bulk_attr_t bulk[3]; 4537 int count = 0; 4538 4539 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 4540 &mtime, 16); 4541 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 4542 &ctime, 16); 4543 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 4544 &zp->z_pflags, 8); 4545 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 4546 B_TRUE); 4547 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0); 4548 } 4549 dmu_tx_commit(tx); 4550 4551out: 4552 pvn_write_done(pp, (err ? B_ERROR : 0) | flags); 4553 if (offp) 4554 *offp = off; 4555 if (lenp) 4556 *lenp = len; 4557 4558 return (err); 4559} 4560 4561/* 4562 * Copy the portion of the file indicated from pages into the file. 4563 * The pages are stored in a page list attached to the files vnode. 4564 * 4565 * IN: vp - vnode of file to push page data to. 4566 * off - position in file to put data. 4567 * len - amount of data to write. 4568 * flags - flags to control the operation. 4569 * cr - credentials of caller. 4570 * ct - caller context. 4571 * 4572 * RETURN: 0 on success, error code on failure. 4573 * 4574 * Timestamps: 4575 * vp - ctime|mtime updated 4576 */ 4577/*ARGSUSED*/ 4578static int 4579zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr, 4580 caller_context_t *ct) 4581{ 4582 znode_t *zp = VTOZ(vp); 4583 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4584 page_t *pp; 4585 size_t io_len; 4586 u_offset_t io_off; 4587 uint_t blksz; 4588 rl_t *rl; 4589 int error = 0; 4590 4591 ZFS_ENTER(zfsvfs); 4592 ZFS_VERIFY_ZP(zp); 4593 4594 /* 4595 * Align this request to the file block size in case we kluster. 4596 * XXX - this can result in pretty aggresive locking, which can 4597 * impact simultanious read/write access. One option might be 4598 * to break up long requests (len == 0) into block-by-block 4599 * operations to get narrower locking. 4600 */ 4601 blksz = zp->z_blksz; 4602 if (ISP2(blksz)) 4603 io_off = P2ALIGN_TYPED(off, blksz, u_offset_t); 4604 else 4605 io_off = 0; 4606 if (len > 0 && ISP2(blksz)) 4607 io_len = P2ROUNDUP_TYPED(len + (off - io_off), blksz, size_t); 4608 else 4609 io_len = 0; 4610 4611 if (io_len == 0) { 4612 /* 4613 * Search the entire vp list for pages >= io_off. 4614 */ 4615 rl = zfs_range_lock(zp, io_off, UINT64_MAX, RL_WRITER); 4616 error = pvn_vplist_dirty(vp, io_off, zfs_putapage, flags, cr); 4617 goto out; 4618 } 4619 rl = zfs_range_lock(zp, io_off, io_len, RL_WRITER); 4620 4621 if (off > zp->z_size) { 4622 /* past end of file */ 4623 zfs_range_unlock(rl); 4624 ZFS_EXIT(zfsvfs); 4625 return (0); 4626 } 4627 4628 len = MIN(io_len, P2ROUNDUP(zp->z_size, PAGESIZE) - io_off); 4629 4630 for (off = io_off; io_off < off + len; io_off += io_len) { 4631 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { 4632 pp = page_lookup(vp, io_off, 4633 (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED); 4634 } else { 4635 pp = page_lookup_nowait(vp, io_off, 4636 (flags & B_FREE) ? SE_EXCL : SE_SHARED); 4637 } 4638 4639 if (pp != NULL && pvn_getdirty(pp, flags)) { 4640 int err; 4641 4642 /* 4643 * Found a dirty page to push 4644 */ 4645 err = zfs_putapage(vp, pp, &io_off, &io_len, flags, cr); 4646 if (err) 4647 error = err; 4648 } else { 4649 io_len = PAGESIZE; 4650 } 4651 } 4652out: 4653 zfs_range_unlock(rl); 4654 if ((flags & B_ASYNC) == 0 || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4655 zil_commit(zfsvfs->z_log, zp->z_id); 4656 ZFS_EXIT(zfsvfs); 4657 return (error); 4658} 4659#endif /* sun */ 4660 4661/*ARGSUSED*/ 4662void 4663zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 4664{ 4665 znode_t *zp = VTOZ(vp); 4666 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4667 int error; 4668 4669 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER); 4670 if (zp->z_sa_hdl == NULL) { 4671 /* 4672 * The fs has been unmounted, or we did a 4673 * suspend/resume and this file no longer exists. 4674 */ 4675 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4676 vrecycle(vp); 4677 return; 4678 } 4679 4680 mutex_enter(&zp->z_lock); 4681 if (zp->z_unlinked) { 4682 /* 4683 * Fast path to recycle a vnode of a removed file. 4684 */ 4685 mutex_exit(&zp->z_lock); 4686 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4687 vrecycle(vp); 4688 return; 4689 } 4690 mutex_exit(&zp->z_lock); 4691 4692 if (zp->z_atime_dirty && zp->z_unlinked == 0) { 4693 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os); 4694 4695 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 4696 zfs_sa_upgrade_txholds(tx, zp); 4697 error = dmu_tx_assign(tx, TXG_WAIT); 4698 if (error) { 4699 dmu_tx_abort(tx); 4700 } else { 4701 mutex_enter(&zp->z_lock); 4702 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs), 4703 (void *)&zp->z_atime, sizeof (zp->z_atime), tx); 4704 zp->z_atime_dirty = 0; 4705 mutex_exit(&zp->z_lock); 4706 dmu_tx_commit(tx); 4707 } 4708 } 4709 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4710} 4711 4712#ifdef sun 4713/* 4714 * Bounds-check the seek operation. 4715 * 4716 * IN: vp - vnode seeking within 4717 * ooff - old file offset 4718 * noffp - pointer to new file offset 4719 * ct - caller context 4720 * 4721 * RETURN: 0 on success, EINVAL if new offset invalid. 4722 */ 4723/* ARGSUSED */ 4724static int 4725zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, 4726 caller_context_t *ct) 4727{ 4728 if (vp->v_type == VDIR) 4729 return (0); 4730 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); 4731} 4732 4733/* 4734 * Pre-filter the generic locking function to trap attempts to place 4735 * a mandatory lock on a memory mapped file. 4736 */ 4737static int 4738zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset, 4739 flk_callback_t *flk_cbp, cred_t *cr, caller_context_t *ct) 4740{ 4741 znode_t *zp = VTOZ(vp); 4742 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4743 4744 ZFS_ENTER(zfsvfs); 4745 ZFS_VERIFY_ZP(zp); 4746 4747 /* 4748 * We are following the UFS semantics with respect to mapcnt 4749 * here: If we see that the file is mapped already, then we will 4750 * return an error, but we don't worry about races between this 4751 * function and zfs_map(). 4752 */ 4753 if (zp->z_mapcnt > 0 && MANDMODE(zp->z_mode)) { 4754 ZFS_EXIT(zfsvfs); 4755 return (SET_ERROR(EAGAIN)); 4756 } 4757 ZFS_EXIT(zfsvfs); 4758 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct)); 4759} 4760 4761/* 4762 * If we can't find a page in the cache, we will create a new page 4763 * and fill it with file data. For efficiency, we may try to fill 4764 * multiple pages at once (klustering) to fill up the supplied page 4765 * list. Note that the pages to be filled are held with an exclusive 4766 * lock to prevent access by other threads while they are being filled. 4767 */ 4768static int 4769zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg, 4770 caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw) 4771{ 4772 znode_t *zp = VTOZ(vp); 4773 page_t *pp, *cur_pp; 4774 objset_t *os = zp->z_zfsvfs->z_os; 4775 u_offset_t io_off, total; 4776 size_t io_len; 4777 int err; 4778 4779 if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE) { 4780 /* 4781 * We only have a single page, don't bother klustering 4782 */ 4783 io_off = off; 4784 io_len = PAGESIZE; 4785 pp = page_create_va(vp, io_off, io_len, 4786 PG_EXCL | PG_WAIT, seg, addr); 4787 } else { 4788 /* 4789 * Try to find enough pages to fill the page list 4790 */ 4791 pp = pvn_read_kluster(vp, off, seg, addr, &io_off, 4792 &io_len, off, plsz, 0); 4793 } 4794 if (pp == NULL) { 4795 /* 4796 * The page already exists, nothing to do here. 4797 */ 4798 *pl = NULL; 4799 return (0); 4800 } 4801 4802 /* 4803 * Fill the pages in the kluster. 4804 */ 4805 cur_pp = pp; 4806 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) { 4807 caddr_t va; 4808 4809 ASSERT3U(io_off, ==, cur_pp->p_offset); 4810 va = zfs_map_page(cur_pp, S_WRITE); 4811 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va, 4812 DMU_READ_PREFETCH); 4813 zfs_unmap_page(cur_pp, va); 4814 if (err) { 4815 /* On error, toss the entire kluster */ 4816 pvn_read_done(pp, B_ERROR); 4817 /* convert checksum errors into IO errors */ 4818 if (err == ECKSUM) 4819 err = SET_ERROR(EIO); 4820 return (err); 4821 } 4822 cur_pp = cur_pp->p_next; 4823 } 4824 4825 /* 4826 * Fill in the page list array from the kluster starting 4827 * from the desired offset `off'. 4828 * NOTE: the page list will always be null terminated. 4829 */ 4830 pvn_plist_init(pp, pl, plsz, off, io_len, rw); 4831 ASSERT(pl == NULL || (*pl)->p_offset == off); 4832 4833 return (0); 4834} 4835 4836/* 4837 * Return pointers to the pages for the file region [off, off + len] 4838 * in the pl array. If plsz is greater than len, this function may 4839 * also return page pointers from after the specified region 4840 * (i.e. the region [off, off + plsz]). These additional pages are 4841 * only returned if they are already in the cache, or were created as 4842 * part of a klustered read. 4843 * 4844 * IN: vp - vnode of file to get data from. 4845 * off - position in file to get data from. 4846 * len - amount of data to retrieve. 4847 * plsz - length of provided page list. 4848 * seg - segment to obtain pages for. 4849 * addr - virtual address of fault. 4850 * rw - mode of created pages. 4851 * cr - credentials of caller. 4852 * ct - caller context. 4853 * 4854 * OUT: protp - protection mode of created pages. 4855 * pl - list of pages created. 4856 * 4857 * RETURN: 0 on success, error code on failure. 4858 * 4859 * Timestamps: 4860 * vp - atime updated 4861 */ 4862/* ARGSUSED */ 4863static int 4864zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp, 4865 page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, 4866 enum seg_rw rw, cred_t *cr, caller_context_t *ct) 4867{ 4868 znode_t *zp = VTOZ(vp); 4869 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4870 page_t **pl0 = pl; 4871 int err = 0; 4872 4873 /* we do our own caching, faultahead is unnecessary */ 4874 if (pl == NULL) 4875 return (0); 4876 else if (len > plsz) 4877 len = plsz; 4878 else 4879 len = P2ROUNDUP(len, PAGESIZE); 4880 ASSERT(plsz >= len); 4881 4882 ZFS_ENTER(zfsvfs); 4883 ZFS_VERIFY_ZP(zp); 4884 4885 if (protp) 4886 *protp = PROT_ALL; 4887 4888 /* 4889 * Loop through the requested range [off, off + len) looking 4890 * for pages. If we don't find a page, we will need to create 4891 * a new page and fill it with data from the file. 4892 */ 4893 while (len > 0) { 4894 if (*pl = page_lookup(vp, off, SE_SHARED)) 4895 *(pl+1) = NULL; 4896 else if (err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw)) 4897 goto out; 4898 while (*pl) { 4899 ASSERT3U((*pl)->p_offset, ==, off); 4900 off += PAGESIZE; 4901 addr += PAGESIZE; 4902 if (len > 0) { 4903 ASSERT3U(len, >=, PAGESIZE); 4904 len -= PAGESIZE; 4905 } 4906 ASSERT3U(plsz, >=, PAGESIZE); 4907 plsz -= PAGESIZE; 4908 pl++; 4909 } 4910 } 4911 4912 /* 4913 * Fill out the page array with any pages already in the cache. 4914 */ 4915 while (plsz > 0 && 4916 (*pl++ = page_lookup_nowait(vp, off, SE_SHARED))) { 4917 off += PAGESIZE; 4918 plsz -= PAGESIZE; 4919 } 4920out: 4921 if (err) { 4922 /* 4923 * Release any pages we have previously locked. 4924 */ 4925 while (pl > pl0) 4926 page_unlock(*--pl); 4927 } else { 4928 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 4929 } 4930 4931 *pl = NULL; 4932 4933 ZFS_EXIT(zfsvfs); 4934 return (err); 4935} 4936 4937/* 4938 * Request a memory map for a section of a file. This code interacts 4939 * with common code and the VM system as follows: 4940 * 4941 * - common code calls mmap(), which ends up in smmap_common() 4942 * - this calls VOP_MAP(), which takes you into (say) zfs 4943 * - zfs_map() calls as_map(), passing segvn_create() as the callback 4944 * - segvn_create() creates the new segment and calls VOP_ADDMAP() 4945 * - zfs_addmap() updates z_mapcnt 4946 */ 4947/*ARGSUSED*/ 4948static int 4949zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp, 4950 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, 4951 caller_context_t *ct) 4952{ 4953 znode_t *zp = VTOZ(vp); 4954 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4955 segvn_crargs_t vn_a; 4956 int error; 4957 4958 ZFS_ENTER(zfsvfs); 4959 ZFS_VERIFY_ZP(zp); 4960 4961 if ((prot & PROT_WRITE) && (zp->z_pflags & 4962 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) { 4963 ZFS_EXIT(zfsvfs); 4964 return (SET_ERROR(EPERM)); 4965 } 4966 4967 if ((prot & (PROT_READ | PROT_EXEC)) && 4968 (zp->z_pflags & ZFS_AV_QUARANTINED)) { 4969 ZFS_EXIT(zfsvfs); 4970 return (SET_ERROR(EACCES)); 4971 } 4972 4973 if (vp->v_flag & VNOMAP) { 4974 ZFS_EXIT(zfsvfs); 4975 return (SET_ERROR(ENOSYS)); 4976 } 4977 4978 if (off < 0 || len > MAXOFFSET_T - off) { 4979 ZFS_EXIT(zfsvfs); 4980 return (SET_ERROR(ENXIO)); 4981 } 4982 4983 if (vp->v_type != VREG) { 4984 ZFS_EXIT(zfsvfs); 4985 return (SET_ERROR(ENODEV)); 4986 } 4987 4988 /* 4989 * If file is locked, disallow mapping. 4990 */ 4991 if (MANDMODE(zp->z_mode) && vn_has_flocks(vp)) { 4992 ZFS_EXIT(zfsvfs); 4993 return (SET_ERROR(EAGAIN)); 4994 } 4995 4996 as_rangelock(as); 4997 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags); 4998 if (error != 0) { 4999 as_rangeunlock(as); 5000 ZFS_EXIT(zfsvfs); 5001 return (error); 5002 } 5003 5004 vn_a.vp = vp; 5005 vn_a.offset = (u_offset_t)off; 5006 vn_a.type = flags & MAP_TYPE; 5007 vn_a.prot = prot; 5008 vn_a.maxprot = maxprot; 5009 vn_a.cred = cr; 5010 vn_a.amp = NULL; 5011 vn_a.flags = flags & ~MAP_TYPE; 5012 vn_a.szc = 0; 5013 vn_a.lgrp_mem_policy_flags = 0; 5014 5015 error = as_map(as, *addrp, len, segvn_create, &vn_a); 5016 5017 as_rangeunlock(as); 5018 ZFS_EXIT(zfsvfs); 5019 return (error); 5020} 5021 5022/* ARGSUSED */ 5023static int 5024zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 5025 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, 5026 caller_context_t *ct) 5027{ 5028 uint64_t pages = btopr(len); 5029 5030 atomic_add_64(&VTOZ(vp)->z_mapcnt, pages); 5031 return (0); 5032} 5033 5034/* 5035 * The reason we push dirty pages as part of zfs_delmap() is so that we get a 5036 * more accurate mtime for the associated file. Since we don't have a way of 5037 * detecting when the data was actually modified, we have to resort to 5038 * heuristics. If an explicit msync() is done, then we mark the mtime when the 5039 * last page is pushed. The problem occurs when the msync() call is omitted, 5040 * which by far the most common case: 5041 * 5042 * open() 5043 * mmap() 5044 * <modify memory> 5045 * munmap() 5046 * close() 5047 * <time lapse> 5048 * putpage() via fsflush 5049 * 5050 * If we wait until fsflush to come along, we can have a modification time that 5051 * is some arbitrary point in the future. In order to prevent this in the 5052 * common case, we flush pages whenever a (MAP_SHARED, PROT_WRITE) mapping is 5053 * torn down. 5054 */ 5055/* ARGSUSED */ 5056static int 5057zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 5058 size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr, 5059 caller_context_t *ct) 5060{ 5061 uint64_t pages = btopr(len); 5062 5063 ASSERT3U(VTOZ(vp)->z_mapcnt, >=, pages); 5064 atomic_add_64(&VTOZ(vp)->z_mapcnt, -pages); 5065 5066 if ((flags & MAP_SHARED) && (prot & PROT_WRITE) && 5067 vn_has_cached_data(vp)) 5068 (void) VOP_PUTPAGE(vp, off, len, B_ASYNC, cr, ct); 5069 5070 return (0); 5071} 5072 5073/* 5074 * Free or allocate space in a file. Currently, this function only 5075 * supports the `F_FREESP' command. However, this command is somewhat 5076 * misnamed, as its functionality includes the ability to allocate as 5077 * well as free space. 5078 * 5079 * IN: vp - vnode of file to free data in. 5080 * cmd - action to take (only F_FREESP supported). 5081 * bfp - section of file to free/alloc. 5082 * flag - current file open mode flags. 5083 * offset - current file offset. 5084 * cr - credentials of caller [UNUSED]. 5085 * ct - caller context. 5086 * 5087 * RETURN: 0 on success, error code on failure. 5088 * 5089 * Timestamps: 5090 * vp - ctime|mtime updated 5091 */ 5092/* ARGSUSED */ 5093static int 5094zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag, 5095 offset_t offset, cred_t *cr, caller_context_t *ct) 5096{ 5097 znode_t *zp = VTOZ(vp); 5098 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5099 uint64_t off, len; 5100 int error; 5101 5102 ZFS_ENTER(zfsvfs); 5103 ZFS_VERIFY_ZP(zp); 5104 5105 if (cmd != F_FREESP) { 5106 ZFS_EXIT(zfsvfs); 5107 return (SET_ERROR(EINVAL)); 5108 } 5109 5110 if (error = convoff(vp, bfp, 0, offset)) { 5111 ZFS_EXIT(zfsvfs); 5112 return (error); 5113 } 5114 5115 if (bfp->l_len < 0) { 5116 ZFS_EXIT(zfsvfs); 5117 return (SET_ERROR(EINVAL)); 5118 } 5119 5120 off = bfp->l_start; 5121 len = bfp->l_len; /* 0 means from off to end of file */ 5122 5123 error = zfs_freesp(zp, off, len, flag, TRUE); 5124 5125 ZFS_EXIT(zfsvfs); 5126 return (error); 5127} 5128#endif /* sun */ 5129 5130CTASSERT(sizeof(struct zfid_short) <= sizeof(struct fid)); 5131CTASSERT(sizeof(struct zfid_long) <= sizeof(struct fid)); 5132 5133/*ARGSUSED*/ 5134static int 5135zfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 5136{ 5137 znode_t *zp = VTOZ(vp); 5138 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5139 uint32_t gen; 5140 uint64_t gen64; 5141 uint64_t object = zp->z_id; 5142 zfid_short_t *zfid; 5143 int size, i, error; 5144 5145 ZFS_ENTER(zfsvfs); 5146 ZFS_VERIFY_ZP(zp); 5147 5148 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), 5149 &gen64, sizeof (uint64_t))) != 0) { 5150 ZFS_EXIT(zfsvfs); 5151 return (error); 5152 } 5153 5154 gen = (uint32_t)gen64; 5155 5156 size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN; 5157 5158#ifdef illumos 5159 if (fidp->fid_len < size) { 5160 fidp->fid_len = size; 5161 ZFS_EXIT(zfsvfs); 5162 return (SET_ERROR(ENOSPC)); 5163 } 5164#else 5165 fidp->fid_len = size; 5166#endif 5167 5168 zfid = (zfid_short_t *)fidp; 5169 5170 zfid->zf_len = size; 5171 5172 for (i = 0; i < sizeof (zfid->zf_object); i++) 5173 zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 5174 5175 /* Must have a non-zero generation number to distinguish from .zfs */ 5176 if (gen == 0) 5177 gen = 1; 5178 for (i = 0; i < sizeof (zfid->zf_gen); i++) 5179 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i)); 5180 5181 if (size == LONG_FID_LEN) { 5182 uint64_t objsetid = dmu_objset_id(zfsvfs->z_os); 5183 zfid_long_t *zlfid; 5184 5185 zlfid = (zfid_long_t *)fidp; 5186 5187 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 5188 zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i)); 5189 5190 /* XXX - this should be the generation number for the objset */ 5191 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 5192 zlfid->zf_setgen[i] = 0; 5193 } 5194 5195 ZFS_EXIT(zfsvfs); 5196 return (0); 5197} 5198 5199static int 5200zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, 5201 caller_context_t *ct) 5202{ 5203 znode_t *zp, *xzp; 5204 zfsvfs_t *zfsvfs; 5205 zfs_dirlock_t *dl; 5206 int error; 5207 5208 switch (cmd) { 5209 case _PC_LINK_MAX: 5210 *valp = INT_MAX; 5211 return (0); 5212 5213 case _PC_FILESIZEBITS: 5214 *valp = 64; 5215 return (0); 5216#ifdef sun 5217 case _PC_XATTR_EXISTS: 5218 zp = VTOZ(vp); 5219 zfsvfs = zp->z_zfsvfs; 5220 ZFS_ENTER(zfsvfs); 5221 ZFS_VERIFY_ZP(zp); 5222 *valp = 0; 5223 error = zfs_dirent_lock(&dl, zp, "", &xzp, 5224 ZXATTR | ZEXISTS | ZSHARED, NULL, NULL); 5225 if (error == 0) { 5226 zfs_dirent_unlock(dl); 5227 if (!zfs_dirempty(xzp)) 5228 *valp = 1; 5229 VN_RELE(ZTOV(xzp)); 5230 } else if (error == ENOENT) { 5231 /* 5232 * If there aren't extended attributes, it's the 5233 * same as having zero of them. 5234 */ 5235 error = 0; 5236 } 5237 ZFS_EXIT(zfsvfs); 5238 return (error); 5239 5240 case _PC_SATTR_ENABLED: 5241 case _PC_SATTR_EXISTS: 5242 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) && 5243 (vp->v_type == VREG || vp->v_type == VDIR); 5244 return (0); 5245 5246 case _PC_ACCESS_FILTERING: 5247 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_ACCESS_FILTER) && 5248 vp->v_type == VDIR; 5249 return (0); 5250 5251 case _PC_ACL_ENABLED: 5252 *valp = _ACL_ACE_ENABLED; 5253 return (0); 5254#endif /* sun */ 5255 case _PC_MIN_HOLE_SIZE: 5256 *valp = (int)SPA_MINBLOCKSIZE; 5257 return (0); 5258#ifdef sun 5259 case _PC_TIMESTAMP_RESOLUTION: 5260 /* nanosecond timestamp resolution */ 5261 *valp = 1L; 5262 return (0); 5263#endif /* sun */ 5264 case _PC_ACL_EXTENDED: 5265 *valp = 0; 5266 return (0); 5267 5268 case _PC_ACL_NFS4: 5269 *valp = 1; 5270 return (0); 5271 5272 case _PC_ACL_PATH_MAX: 5273 *valp = ACL_MAX_ENTRIES; 5274 return (0); 5275 5276 default: 5277 return (EOPNOTSUPP); 5278 } 5279} 5280 5281/*ARGSUSED*/ 5282static int 5283zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr, 5284 caller_context_t *ct) 5285{ 5286 znode_t *zp = VTOZ(vp); 5287 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5288 int error; 5289 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 5290 5291 ZFS_ENTER(zfsvfs); 5292 ZFS_VERIFY_ZP(zp); 5293 error = zfs_getacl(zp, vsecp, skipaclchk, cr); 5294 ZFS_EXIT(zfsvfs); 5295 5296 return (error); 5297} 5298 5299/*ARGSUSED*/ 5300int 5301zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr, 5302 caller_context_t *ct) 5303{ 5304 znode_t *zp = VTOZ(vp); 5305 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5306 int error; 5307 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 5308 zilog_t *zilog = zfsvfs->z_log; 5309 5310 ZFS_ENTER(zfsvfs); 5311 ZFS_VERIFY_ZP(zp); 5312 5313 error = zfs_setacl(zp, vsecp, skipaclchk, cr); 5314 5315 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 5316 zil_commit(zilog, 0); 5317 5318 ZFS_EXIT(zfsvfs); 5319 return (error); 5320} 5321 5322#ifdef sun 5323/* 5324 * The smallest read we may consider to loan out an arcbuf. 5325 * This must be a power of 2. 5326 */ 5327int zcr_blksz_min = (1 << 10); /* 1K */ 5328/* 5329 * If set to less than the file block size, allow loaning out of an 5330 * arcbuf for a partial block read. This must be a power of 2. 5331 */ 5332int zcr_blksz_max = (1 << 17); /* 128K */ 5333 5334/*ARGSUSED*/ 5335static int 5336zfs_reqzcbuf(vnode_t *vp, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr, 5337 caller_context_t *ct) 5338{ 5339 znode_t *zp = VTOZ(vp); 5340 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5341 int max_blksz = zfsvfs->z_max_blksz; 5342 uio_t *uio = &xuio->xu_uio; 5343 ssize_t size = uio->uio_resid; 5344 offset_t offset = uio->uio_loffset; 5345 int blksz; 5346 int fullblk, i; 5347 arc_buf_t *abuf; 5348 ssize_t maxsize; 5349 int preamble, postamble; 5350 5351 if (xuio->xu_type != UIOTYPE_ZEROCOPY) 5352 return (SET_ERROR(EINVAL)); 5353 5354 ZFS_ENTER(zfsvfs); 5355 ZFS_VERIFY_ZP(zp); 5356 switch (ioflag) { 5357 case UIO_WRITE: 5358 /* 5359 * Loan out an arc_buf for write if write size is bigger than 5360 * max_blksz, and the file's block size is also max_blksz. 5361 */ 5362 blksz = max_blksz; 5363 if (size < blksz || zp->z_blksz != blksz) { 5364 ZFS_EXIT(zfsvfs); 5365 return (SET_ERROR(EINVAL)); 5366 } 5367 /* 5368 * Caller requests buffers for write before knowing where the 5369 * write offset might be (e.g. NFS TCP write). 5370 */ 5371 if (offset == -1) { 5372 preamble = 0; 5373 } else { 5374 preamble = P2PHASE(offset, blksz); 5375 if (preamble) { 5376 preamble = blksz - preamble; 5377 size -= preamble; 5378 } 5379 } 5380 5381 postamble = P2PHASE(size, blksz); 5382 size -= postamble; 5383 5384 fullblk = size / blksz; 5385 (void) dmu_xuio_init(xuio, 5386 (preamble != 0) + fullblk + (postamble != 0)); 5387 DTRACE_PROBE3(zfs_reqzcbuf_align, int, preamble, 5388 int, postamble, int, 5389 (preamble != 0) + fullblk + (postamble != 0)); 5390 5391 /* 5392 * Have to fix iov base/len for partial buffers. They 5393 * currently represent full arc_buf's. 5394 */ 5395 if (preamble) { 5396 /* data begins in the middle of the arc_buf */ 5397 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5398 blksz); 5399 ASSERT(abuf); 5400 (void) dmu_xuio_add(xuio, abuf, 5401 blksz - preamble, preamble); 5402 } 5403 5404 for (i = 0; i < fullblk; i++) { 5405 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5406 blksz); 5407 ASSERT(abuf); 5408 (void) dmu_xuio_add(xuio, abuf, 0, blksz); 5409 } 5410 5411 if (postamble) { 5412 /* data ends in the middle of the arc_buf */ 5413 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5414 blksz); 5415 ASSERT(abuf); 5416 (void) dmu_xuio_add(xuio, abuf, 0, postamble); 5417 } 5418 break; 5419 case UIO_READ: 5420 /* 5421 * Loan out an arc_buf for read if the read size is larger than 5422 * the current file block size. Block alignment is not 5423 * considered. Partial arc_buf will be loaned out for read. 5424 */ 5425 blksz = zp->z_blksz; 5426 if (blksz < zcr_blksz_min) 5427 blksz = zcr_blksz_min; 5428 if (blksz > zcr_blksz_max) 5429 blksz = zcr_blksz_max; 5430 /* avoid potential complexity of dealing with it */ 5431 if (blksz > max_blksz) { 5432 ZFS_EXIT(zfsvfs); 5433 return (SET_ERROR(EINVAL)); 5434 } 5435 5436 maxsize = zp->z_size - uio->uio_loffset; 5437 if (size > maxsize) 5438 size = maxsize; 5439 5440 if (size < blksz || vn_has_cached_data(vp)) { 5441 ZFS_EXIT(zfsvfs); 5442 return (SET_ERROR(EINVAL)); 5443 } 5444 break; 5445 default: 5446 ZFS_EXIT(zfsvfs); 5447 return (SET_ERROR(EINVAL)); 5448 } 5449 5450 uio->uio_extflg = UIO_XUIO; 5451 XUIO_XUZC_RW(xuio) = ioflag; 5452 ZFS_EXIT(zfsvfs); 5453 return (0); 5454} 5455 5456/*ARGSUSED*/ 5457static int 5458zfs_retzcbuf(vnode_t *vp, xuio_t *xuio, cred_t *cr, caller_context_t *ct) 5459{ 5460 int i; 5461 arc_buf_t *abuf; 5462 int ioflag = XUIO_XUZC_RW(xuio); 5463 5464 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY); 5465 5466 i = dmu_xuio_cnt(xuio); 5467 while (i-- > 0) { 5468 abuf = dmu_xuio_arcbuf(xuio, i); 5469 /* 5470 * if abuf == NULL, it must be a write buffer 5471 * that has been returned in zfs_write(). 5472 */ 5473 if (abuf) 5474 dmu_return_arcbuf(abuf); 5475 ASSERT(abuf || ioflag == UIO_WRITE); 5476 } 5477 5478 dmu_xuio_fini(xuio); 5479 return (0); 5480} 5481 5482/* 5483 * Predeclare these here so that the compiler assumes that 5484 * this is an "old style" function declaration that does 5485 * not include arguments => we won't get type mismatch errors 5486 * in the initializations that follow. 5487 */ 5488static int zfs_inval(); 5489static int zfs_isdir(); 5490 5491static int 5492zfs_inval() 5493{ 5494 return (SET_ERROR(EINVAL)); 5495} 5496 5497static int 5498zfs_isdir() 5499{ 5500 return (SET_ERROR(EISDIR)); 5501} 5502/* 5503 * Directory vnode operations template 5504 */ 5505vnodeops_t *zfs_dvnodeops; 5506const fs_operation_def_t zfs_dvnodeops_template[] = { 5507 VOPNAME_OPEN, { .vop_open = zfs_open }, 5508 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5509 VOPNAME_READ, { .error = zfs_isdir }, 5510 VOPNAME_WRITE, { .error = zfs_isdir }, 5511 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5512 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5513 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5514 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5515 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5516 VOPNAME_CREATE, { .vop_create = zfs_create }, 5517 VOPNAME_REMOVE, { .vop_remove = zfs_remove }, 5518 VOPNAME_LINK, { .vop_link = zfs_link }, 5519 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5520 VOPNAME_MKDIR, { .vop_mkdir = zfs_mkdir }, 5521 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir }, 5522 VOPNAME_READDIR, { .vop_readdir = zfs_readdir }, 5523 VOPNAME_SYMLINK, { .vop_symlink = zfs_symlink }, 5524 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5525 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5526 VOPNAME_FID, { .vop_fid = zfs_fid }, 5527 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5528 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5529 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5530 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5531 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5532 NULL, NULL 5533}; 5534 5535/* 5536 * Regular file vnode operations template 5537 */ 5538vnodeops_t *zfs_fvnodeops; 5539const fs_operation_def_t zfs_fvnodeops_template[] = { 5540 VOPNAME_OPEN, { .vop_open = zfs_open }, 5541 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5542 VOPNAME_READ, { .vop_read = zfs_read }, 5543 VOPNAME_WRITE, { .vop_write = zfs_write }, 5544 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5545 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5546 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5547 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5548 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5549 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5550 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5551 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5552 VOPNAME_FID, { .vop_fid = zfs_fid }, 5553 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5554 VOPNAME_FRLOCK, { .vop_frlock = zfs_frlock }, 5555 VOPNAME_SPACE, { .vop_space = zfs_space }, 5556 VOPNAME_GETPAGE, { .vop_getpage = zfs_getpage }, 5557 VOPNAME_PUTPAGE, { .vop_putpage = zfs_putpage }, 5558 VOPNAME_MAP, { .vop_map = zfs_map }, 5559 VOPNAME_ADDMAP, { .vop_addmap = zfs_addmap }, 5560 VOPNAME_DELMAP, { .vop_delmap = zfs_delmap }, 5561 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5562 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5563 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5564 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5565 VOPNAME_REQZCBUF, { .vop_reqzcbuf = zfs_reqzcbuf }, 5566 VOPNAME_RETZCBUF, { .vop_retzcbuf = zfs_retzcbuf }, 5567 NULL, NULL 5568}; 5569 5570/* 5571 * Symbolic link vnode operations template 5572 */ 5573vnodeops_t *zfs_symvnodeops; 5574const fs_operation_def_t zfs_symvnodeops_template[] = { 5575 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5576 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5577 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5578 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5579 VOPNAME_READLINK, { .vop_readlink = zfs_readlink }, 5580 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5581 VOPNAME_FID, { .vop_fid = zfs_fid }, 5582 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5583 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5584 NULL, NULL 5585}; 5586 5587/* 5588 * special share hidden files vnode operations template 5589 */ 5590vnodeops_t *zfs_sharevnodeops; 5591const fs_operation_def_t zfs_sharevnodeops_template[] = { 5592 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5593 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5594 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5595 VOPNAME_FID, { .vop_fid = zfs_fid }, 5596 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5597 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5598 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5599 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5600 NULL, NULL 5601}; 5602 5603/* 5604 * Extended attribute directory vnode operations template 5605 * 5606 * This template is identical to the directory vnodes 5607 * operation template except for restricted operations: 5608 * VOP_MKDIR() 5609 * VOP_SYMLINK() 5610 * 5611 * Note that there are other restrictions embedded in: 5612 * zfs_create() - restrict type to VREG 5613 * zfs_link() - no links into/out of attribute space 5614 * zfs_rename() - no moves into/out of attribute space 5615 */ 5616vnodeops_t *zfs_xdvnodeops; 5617const fs_operation_def_t zfs_xdvnodeops_template[] = { 5618 VOPNAME_OPEN, { .vop_open = zfs_open }, 5619 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5620 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5621 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5622 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5623 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5624 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5625 VOPNAME_CREATE, { .vop_create = zfs_create }, 5626 VOPNAME_REMOVE, { .vop_remove = zfs_remove }, 5627 VOPNAME_LINK, { .vop_link = zfs_link }, 5628 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5629 VOPNAME_MKDIR, { .error = zfs_inval }, 5630 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir }, 5631 VOPNAME_READDIR, { .vop_readdir = zfs_readdir }, 5632 VOPNAME_SYMLINK, { .error = zfs_inval }, 5633 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5634 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5635 VOPNAME_FID, { .vop_fid = zfs_fid }, 5636 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5637 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5638 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5639 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5640 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5641 NULL, NULL 5642}; 5643 5644/* 5645 * Error vnode operations template 5646 */ 5647vnodeops_t *zfs_evnodeops; 5648const fs_operation_def_t zfs_evnodeops_template[] = { 5649 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5650 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5651 NULL, NULL 5652}; 5653#endif /* sun */ 5654 5655static int 5656ioflags(int ioflags) 5657{ 5658 int flags = 0; 5659 5660 if (ioflags & IO_APPEND) 5661 flags |= FAPPEND; 5662 if (ioflags & IO_NDELAY) 5663 flags |= FNONBLOCK; 5664 if (ioflags & IO_SYNC) 5665 flags |= (FSYNC | FDSYNC | FRSYNC); 5666 5667 return (flags); 5668} 5669 5670static int 5671zfs_getpages(struct vnode *vp, vm_page_t *m, int count, int reqpage) 5672{ 5673 znode_t *zp = VTOZ(vp); 5674 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5675 objset_t *os = zp->z_zfsvfs->z_os; 5676 vm_page_t mfirst, mlast, mreq; 5677 vm_object_t object; 5678 caddr_t va; 5679 struct sf_buf *sf; 5680 off_t startoff, endoff; 5681 int i, error; 5682 vm_pindex_t reqstart, reqend; 5683 int pcount, lsize, reqsize, size; 5684 5685 ZFS_ENTER(zfsvfs); 5686 ZFS_VERIFY_ZP(zp); 5687 5688 pcount = OFF_TO_IDX(round_page(count)); 5689 mreq = m[reqpage]; 5690 object = mreq->object; 5691 error = 0; 5692 5693 KASSERT(vp->v_object == object, ("mismatching object")); 5694 5695 if (pcount > 1 && zp->z_blksz > PAGESIZE) { 5696 startoff = rounddown(IDX_TO_OFF(mreq->pindex), zp->z_blksz); 5697 reqstart = OFF_TO_IDX(round_page(startoff)); 5698 if (reqstart < m[0]->pindex) 5699 reqstart = 0; 5700 else 5701 reqstart = reqstart - m[0]->pindex; 5702 endoff = roundup(IDX_TO_OFF(mreq->pindex) + PAGE_SIZE, 5703 zp->z_blksz); 5704 reqend = OFF_TO_IDX(trunc_page(endoff)) - 1; 5705 if (reqend > m[pcount - 1]->pindex) 5706 reqend = m[pcount - 1]->pindex; 5707 reqsize = reqend - m[reqstart]->pindex + 1; 5708 KASSERT(reqstart <= reqpage && reqpage < reqstart + reqsize, 5709 ("reqpage beyond [reqstart, reqstart + reqsize[ bounds")); 5710 } else { 5711 reqstart = reqpage; 5712 reqsize = 1; 5713 } 5714 mfirst = m[reqstart]; 5715 mlast = m[reqstart + reqsize - 1]; 5716 5717 zfs_vmobject_wlock(object); 5718 5719 for (i = 0; i < reqstart; i++) { 5720 vm_page_lock(m[i]); 5721 vm_page_free(m[i]); 5722 vm_page_unlock(m[i]); 5723 } 5724 for (i = reqstart + reqsize; i < pcount; i++) { 5725 vm_page_lock(m[i]); 5726 vm_page_free(m[i]); 5727 vm_page_unlock(m[i]); 5728 } 5729 5730 if (mreq->valid && reqsize == 1) { 5731 if (mreq->valid != VM_PAGE_BITS_ALL) 5732 vm_page_zero_invalid(mreq, TRUE); 5733 zfs_vmobject_wunlock(object); 5734 ZFS_EXIT(zfsvfs); 5735 return (zfs_vm_pagerret_ok); 5736 } 5737 5738 PCPU_INC(cnt.v_vnodein); 5739 PCPU_ADD(cnt.v_vnodepgsin, reqsize); 5740 5741 if (IDX_TO_OFF(mreq->pindex) >= object->un_pager.vnp.vnp_size) { 5742 for (i = reqstart; i < reqstart + reqsize; i++) { 5743 if (i != reqpage) { 5744 vm_page_lock(m[i]); 5745 vm_page_free(m[i]); 5746 vm_page_unlock(m[i]); 5747 } 5748 } 5749 zfs_vmobject_wunlock(object); 5750 ZFS_EXIT(zfsvfs); 5751 return (zfs_vm_pagerret_bad); 5752 } 5753 5754 lsize = PAGE_SIZE; 5755 if (IDX_TO_OFF(mlast->pindex) + lsize > object->un_pager.vnp.vnp_size) 5756 lsize = object->un_pager.vnp.vnp_size - IDX_TO_OFF(mlast->pindex); 5757 5758 zfs_vmobject_wunlock(object); 5759 5760 for (i = reqstart; i < reqstart + reqsize; i++) { 5761 size = PAGE_SIZE; 5762 if (i == (reqstart + reqsize - 1)) 5763 size = lsize; 5764 va = zfs_map_page(m[i], &sf); 5765 error = dmu_read(os, zp->z_id, IDX_TO_OFF(m[i]->pindex), 5766 size, va, DMU_READ_PREFETCH); 5767 if (size != PAGE_SIZE) 5768 bzero(va + size, PAGE_SIZE - size); 5769 zfs_unmap_page(sf); 5770 if (error != 0) 5771 break; 5772 } 5773 5774 zfs_vmobject_wlock(object); 5775 5776 for (i = reqstart; i < reqstart + reqsize; i++) { 5777 if (!error) 5778 m[i]->valid = VM_PAGE_BITS_ALL; 5779 KASSERT(m[i]->dirty == 0, ("zfs_getpages: page %p is dirty", m[i])); 5780 if (i != reqpage) 5781 vm_page_readahead_finish(m[i]); 5782 } 5783 5784 zfs_vmobject_wunlock(object); 5785 5786 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 5787 ZFS_EXIT(zfsvfs); 5788 return (error ? zfs_vm_pagerret_error : zfs_vm_pagerret_ok); 5789} 5790 5791static int 5792zfs_freebsd_getpages(ap) 5793 struct vop_getpages_args /* { 5794 struct vnode *a_vp; 5795 vm_page_t *a_m; 5796 int a_count; 5797 int a_reqpage; 5798 vm_ooffset_t a_offset; 5799 } */ *ap; 5800{ 5801 5802 return (zfs_getpages(ap->a_vp, ap->a_m, ap->a_count, ap->a_reqpage)); 5803} 5804 5805static int 5806zfs_putpages(struct vnode *vp, vm_page_t *ma, size_t len, int flags, 5807 int *rtvals) 5808{ 5809 znode_t *zp = VTOZ(vp); 5810 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5811 rl_t *rl; 5812 dmu_tx_t *tx; 5813 struct sf_buf *sf; 5814 vm_object_t object; 5815 vm_page_t m; 5816 caddr_t va; 5817 size_t tocopy; 5818 size_t lo_len; 5819 vm_ooffset_t lo_off; 5820 vm_ooffset_t off; 5821 uint_t blksz; 5822 int ncount; 5823 int pcount; 5824 int err; 5825 int i; 5826 5827 ZFS_ENTER(zfsvfs); 5828 ZFS_VERIFY_ZP(zp); 5829 5830 object = vp->v_object; 5831 pcount = btoc(len); 5832 ncount = pcount; 5833 5834 KASSERT(ma[0]->object == object, ("mismatching object")); 5835 KASSERT(len > 0 && (len & PAGE_MASK) == 0, ("unexpected length")); 5836 5837 for (i = 0; i < pcount; i++) 5838 rtvals[i] = zfs_vm_pagerret_error; 5839 5840 off = IDX_TO_OFF(ma[0]->pindex); 5841 blksz = zp->z_blksz; 5842 lo_off = rounddown(off, blksz); 5843 lo_len = roundup(len + (off - lo_off), blksz); 5844 rl = zfs_range_lock(zp, lo_off, lo_len, RL_WRITER); 5845 5846 zfs_vmobject_wlock(object); 5847 if (len + off > object->un_pager.vnp.vnp_size) { 5848 if (object->un_pager.vnp.vnp_size > off) { 5849 int pgoff; 5850 5851 len = object->un_pager.vnp.vnp_size - off; 5852 ncount = btoc(len); 5853 if ((pgoff = (int)len & PAGE_MASK) != 0) { 5854 /* 5855 * If the object is locked and the following 5856 * conditions hold, then the page's dirty 5857 * field cannot be concurrently changed by a 5858 * pmap operation. 5859 */ 5860 m = ma[ncount - 1]; 5861 vm_page_assert_sbusied(m); 5862 KASSERT(!pmap_page_is_write_mapped(m), 5863 ("zfs_putpages: page %p is not read-only", m)); 5864 vm_page_clear_dirty(m, pgoff, PAGE_SIZE - 5865 pgoff); 5866 } 5867 } else { 5868 len = 0; 5869 ncount = 0; 5870 } 5871 if (ncount < pcount) { 5872 for (i = ncount; i < pcount; i++) { 5873 rtvals[i] = zfs_vm_pagerret_bad; 5874 } 5875 } 5876 } 5877 zfs_vmobject_wunlock(object); 5878 5879 if (ncount == 0) 5880 goto out; 5881 5882 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 5883 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 5884 goto out; 5885 } 5886 5887top: 5888 tx = dmu_tx_create(zfsvfs->z_os); 5889 dmu_tx_hold_write(tx, zp->z_id, off, len); 5890 5891 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 5892 zfs_sa_upgrade_txholds(tx, zp); 5893 err = dmu_tx_assign(tx, TXG_NOWAIT); 5894 if (err != 0) { 5895 if (err == ERESTART) { 5896 dmu_tx_wait(tx); 5897 dmu_tx_abort(tx); 5898 goto top; 5899 } 5900 dmu_tx_abort(tx); 5901 goto out; 5902 } 5903 5904 if (zp->z_blksz < PAGE_SIZE) { 5905 i = 0; 5906 for (i = 0; len > 0; off += tocopy, len -= tocopy, i++) { 5907 tocopy = len > PAGE_SIZE ? PAGE_SIZE : len; 5908 va = zfs_map_page(ma[i], &sf); 5909 dmu_write(zfsvfs->z_os, zp->z_id, off, tocopy, va, tx); 5910 zfs_unmap_page(sf); 5911 } 5912 } else { 5913 err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, ma, tx); 5914 } 5915 5916 if (err == 0) { 5917 uint64_t mtime[2], ctime[2]; 5918 sa_bulk_attr_t bulk[3]; 5919 int count = 0; 5920 5921 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 5922 &mtime, 16); 5923 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 5924 &ctime, 16); 5925 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 5926 &zp->z_pflags, 8); 5927 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 5928 B_TRUE); 5929 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0); 5930 5931 zfs_vmobject_wlock(object); 5932 for (i = 0; i < ncount; i++) { 5933 rtvals[i] = zfs_vm_pagerret_ok; 5934 vm_page_undirty(ma[i]); 5935 } 5936 zfs_vmobject_wunlock(object); 5937 PCPU_INC(cnt.v_vnodeout); 5938 PCPU_ADD(cnt.v_vnodepgsout, ncount); 5939 } 5940 dmu_tx_commit(tx); 5941 5942out: 5943 zfs_range_unlock(rl); 5944 if ((flags & (zfs_vm_pagerput_sync | zfs_vm_pagerput_inval)) != 0 || 5945 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 5946 zil_commit(zfsvfs->z_log, zp->z_id); 5947 ZFS_EXIT(zfsvfs); 5948 return (rtvals[0]); 5949} 5950 5951int 5952zfs_freebsd_putpages(ap) 5953 struct vop_putpages_args /* { 5954 struct vnode *a_vp; 5955 vm_page_t *a_m; 5956 int a_count; 5957 int a_sync; 5958 int *a_rtvals; 5959 vm_ooffset_t a_offset; 5960 } */ *ap; 5961{ 5962 5963 return (zfs_putpages(ap->a_vp, ap->a_m, ap->a_count, ap->a_sync, 5964 ap->a_rtvals)); 5965} 5966 5967static int 5968zfs_freebsd_bmap(ap) 5969 struct vop_bmap_args /* { 5970 struct vnode *a_vp; 5971 daddr_t a_bn; 5972 struct bufobj **a_bop; 5973 daddr_t *a_bnp; 5974 int *a_runp; 5975 int *a_runb; 5976 } */ *ap; 5977{ 5978 5979 if (ap->a_bop != NULL) 5980 *ap->a_bop = &ap->a_vp->v_bufobj; 5981 if (ap->a_bnp != NULL) 5982 *ap->a_bnp = ap->a_bn; 5983 if (ap->a_runp != NULL) 5984 *ap->a_runp = 0; 5985 if (ap->a_runb != NULL) 5986 *ap->a_runb = 0; 5987 5988 return (0); 5989} 5990 5991static int 5992zfs_freebsd_open(ap) 5993 struct vop_open_args /* { 5994 struct vnode *a_vp; 5995 int a_mode; 5996 struct ucred *a_cred; 5997 struct thread *a_td; 5998 } */ *ap; 5999{ 6000 vnode_t *vp = ap->a_vp; 6001 znode_t *zp = VTOZ(vp); 6002 int error; 6003 6004 error = zfs_open(&vp, ap->a_mode, ap->a_cred, NULL); 6005 if (error == 0) 6006 vnode_create_vobject(vp, zp->z_size, ap->a_td); 6007 return (error); 6008} 6009 6010static int 6011zfs_freebsd_close(ap) 6012 struct vop_close_args /* { 6013 struct vnode *a_vp; 6014 int a_fflag; 6015 struct ucred *a_cred; 6016 struct thread *a_td; 6017 } */ *ap; 6018{ 6019 6020 return (zfs_close(ap->a_vp, ap->a_fflag, 1, 0, ap->a_cred, NULL)); 6021} 6022 6023static int 6024zfs_freebsd_ioctl(ap) 6025 struct vop_ioctl_args /* { 6026 struct vnode *a_vp; 6027 u_long a_command; 6028 caddr_t a_data; 6029 int a_fflag; 6030 struct ucred *cred; 6031 struct thread *td; 6032 } */ *ap; 6033{ 6034 6035 return (zfs_ioctl(ap->a_vp, ap->a_command, (intptr_t)ap->a_data, 6036 ap->a_fflag, ap->a_cred, NULL, NULL)); 6037} 6038 6039static int 6040zfs_freebsd_read(ap) 6041 struct vop_read_args /* { 6042 struct vnode *a_vp; 6043 struct uio *a_uio; 6044 int a_ioflag; 6045 struct ucred *a_cred; 6046 } */ *ap; 6047{ 6048 6049 return (zfs_read(ap->a_vp, ap->a_uio, ioflags(ap->a_ioflag), 6050 ap->a_cred, NULL)); 6051} 6052 6053static int 6054zfs_freebsd_write(ap) 6055 struct vop_write_args /* { 6056 struct vnode *a_vp; 6057 struct uio *a_uio; 6058 int a_ioflag; 6059 struct ucred *a_cred; 6060 } */ *ap; 6061{ 6062 6063 return (zfs_write(ap->a_vp, ap->a_uio, ioflags(ap->a_ioflag), 6064 ap->a_cred, NULL)); 6065} 6066 6067static int 6068zfs_freebsd_access(ap) 6069 struct vop_access_args /* { 6070 struct vnode *a_vp; 6071 accmode_t a_accmode; 6072 struct ucred *a_cred; 6073 struct thread *a_td; 6074 } */ *ap; 6075{ 6076 vnode_t *vp = ap->a_vp; 6077 znode_t *zp = VTOZ(vp); 6078 accmode_t accmode; 6079 int error = 0; 6080 6081 /* 6082 * ZFS itself only knowns about VREAD, VWRITE, VEXEC and VAPPEND, 6083 */ 6084 accmode = ap->a_accmode & (VREAD|VWRITE|VEXEC|VAPPEND); 6085 if (accmode != 0) 6086 error = zfs_access(ap->a_vp, accmode, 0, ap->a_cred, NULL); 6087 6088 /* 6089 * VADMIN has to be handled by vaccess(). 6090 */ 6091 if (error == 0) { 6092 accmode = ap->a_accmode & ~(VREAD|VWRITE|VEXEC|VAPPEND); 6093 if (accmode != 0) { 6094 error = vaccess(vp->v_type, zp->z_mode, zp->z_uid, 6095 zp->z_gid, accmode, ap->a_cred, NULL); 6096 } 6097 } 6098 6099 /* 6100 * For VEXEC, ensure that at least one execute bit is set for 6101 * non-directories. 6102 */ 6103 if (error == 0 && (ap->a_accmode & VEXEC) != 0 && vp->v_type != VDIR && 6104 (zp->z_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) { 6105 error = EACCES; 6106 } 6107 6108 return (error); 6109} 6110 6111static int 6112zfs_freebsd_lookup(ap) 6113 struct vop_lookup_args /* { 6114 struct vnode *a_dvp; 6115 struct vnode **a_vpp; 6116 struct componentname *a_cnp; 6117 } */ *ap; 6118{ 6119 struct componentname *cnp = ap->a_cnp; 6120 char nm[NAME_MAX + 1]; 6121 6122 ASSERT(cnp->cn_namelen < sizeof(nm)); 6123 strlcpy(nm, cnp->cn_nameptr, MIN(cnp->cn_namelen + 1, sizeof(nm))); 6124 6125 return (zfs_lookup(ap->a_dvp, nm, ap->a_vpp, cnp, cnp->cn_nameiop, 6126 cnp->cn_cred, cnp->cn_thread, 0)); 6127} 6128 6129static int 6130zfs_freebsd_create(ap) 6131 struct vop_create_args /* { 6132 struct vnode *a_dvp; 6133 struct vnode **a_vpp; 6134 struct componentname *a_cnp; 6135 struct vattr *a_vap; 6136 } */ *ap; 6137{ 6138 struct componentname *cnp = ap->a_cnp; 6139 vattr_t *vap = ap->a_vap; 6140 int mode; 6141 6142 ASSERT(cnp->cn_flags & SAVENAME); 6143 6144 vattr_init_mask(vap); 6145 mode = vap->va_mode & ALLPERMS; 6146 6147 return (zfs_create(ap->a_dvp, cnp->cn_nameptr, vap, !EXCL, mode, 6148 ap->a_vpp, cnp->cn_cred, cnp->cn_thread)); 6149} 6150 6151static int 6152zfs_freebsd_remove(ap) 6153 struct vop_remove_args /* { 6154 struct vnode *a_dvp; 6155 struct vnode *a_vp; 6156 struct componentname *a_cnp; 6157 } */ *ap; 6158{ 6159 6160 ASSERT(ap->a_cnp->cn_flags & SAVENAME); 6161 6162 return (zfs_remove(ap->a_dvp, ap->a_cnp->cn_nameptr, 6163 ap->a_cnp->cn_cred, NULL, 0)); 6164} 6165 6166static int 6167zfs_freebsd_mkdir(ap) 6168 struct vop_mkdir_args /* { 6169 struct vnode *a_dvp; 6170 struct vnode **a_vpp; 6171 struct componentname *a_cnp; 6172 struct vattr *a_vap; 6173 } */ *ap; 6174{ 6175 vattr_t *vap = ap->a_vap; 6176 6177 ASSERT(ap->a_cnp->cn_flags & SAVENAME); 6178 6179 vattr_init_mask(vap); 6180 6181 return (zfs_mkdir(ap->a_dvp, ap->a_cnp->cn_nameptr, vap, ap->a_vpp, 6182 ap->a_cnp->cn_cred, NULL, 0, NULL)); 6183} 6184 6185static int 6186zfs_freebsd_rmdir(ap) 6187 struct vop_rmdir_args /* { 6188 struct vnode *a_dvp; 6189 struct vnode *a_vp; 6190 struct componentname *a_cnp; 6191 } */ *ap; 6192{ 6193 struct componentname *cnp = ap->a_cnp; 6194 6195 ASSERT(cnp->cn_flags & SAVENAME); 6196 6197 return (zfs_rmdir(ap->a_dvp, cnp->cn_nameptr, NULL, cnp->cn_cred, NULL, 0)); 6198} 6199 6200static int 6201zfs_freebsd_readdir(ap) 6202 struct vop_readdir_args /* { 6203 struct vnode *a_vp; 6204 struct uio *a_uio; 6205 struct ucred *a_cred; 6206 int *a_eofflag; 6207 int *a_ncookies; 6208 u_long **a_cookies; 6209 } */ *ap; 6210{ 6211 6212 return (zfs_readdir(ap->a_vp, ap->a_uio, ap->a_cred, ap->a_eofflag, 6213 ap->a_ncookies, ap->a_cookies)); 6214} 6215 6216static int 6217zfs_freebsd_fsync(ap) 6218 struct vop_fsync_args /* { 6219 struct vnode *a_vp; 6220 int a_waitfor; 6221 struct thread *a_td; 6222 } */ *ap; 6223{ 6224 6225 vop_stdfsync(ap); 6226 return (zfs_fsync(ap->a_vp, 0, ap->a_td->td_ucred, NULL)); 6227} 6228 6229static int 6230zfs_freebsd_getattr(ap) 6231 struct vop_getattr_args /* { 6232 struct vnode *a_vp; 6233 struct vattr *a_vap; 6234 struct ucred *a_cred; 6235 } */ *ap; 6236{ 6237 vattr_t *vap = ap->a_vap; 6238 xvattr_t xvap; 6239 u_long fflags = 0; 6240 int error; 6241 6242 xva_init(&xvap); 6243 xvap.xva_vattr = *vap; 6244 xvap.xva_vattr.va_mask |= AT_XVATTR; 6245 6246 /* Convert chflags into ZFS-type flags. */ 6247 /* XXX: what about SF_SETTABLE?. */ 6248 XVA_SET_REQ(&xvap, XAT_IMMUTABLE); 6249 XVA_SET_REQ(&xvap, XAT_APPENDONLY); 6250 XVA_SET_REQ(&xvap, XAT_NOUNLINK); 6251 XVA_SET_REQ(&xvap, XAT_NODUMP); 6252 XVA_SET_REQ(&xvap, XAT_READONLY); 6253 XVA_SET_REQ(&xvap, XAT_ARCHIVE); 6254 XVA_SET_REQ(&xvap, XAT_SYSTEM); 6255 XVA_SET_REQ(&xvap, XAT_HIDDEN); 6256 XVA_SET_REQ(&xvap, XAT_REPARSE); 6257 XVA_SET_REQ(&xvap, XAT_OFFLINE); 6258 XVA_SET_REQ(&xvap, XAT_SPARSE); 6259 6260 error = zfs_getattr(ap->a_vp, (vattr_t *)&xvap, 0, ap->a_cred, NULL); 6261 if (error != 0) 6262 return (error); 6263 6264 /* Convert ZFS xattr into chflags. */ 6265#define FLAG_CHECK(fflag, xflag, xfield) do { \ 6266 if (XVA_ISSET_RTN(&xvap, (xflag)) && (xfield) != 0) \ 6267 fflags |= (fflag); \ 6268} while (0) 6269 FLAG_CHECK(SF_IMMUTABLE, XAT_IMMUTABLE, 6270 xvap.xva_xoptattrs.xoa_immutable); 6271 FLAG_CHECK(SF_APPEND, XAT_APPENDONLY, 6272 xvap.xva_xoptattrs.xoa_appendonly); 6273 FLAG_CHECK(SF_NOUNLINK, XAT_NOUNLINK, 6274 xvap.xva_xoptattrs.xoa_nounlink); 6275 FLAG_CHECK(UF_ARCHIVE, XAT_ARCHIVE, 6276 xvap.xva_xoptattrs.xoa_archive); 6277 FLAG_CHECK(UF_NODUMP, XAT_NODUMP, 6278 xvap.xva_xoptattrs.xoa_nodump); 6279 FLAG_CHECK(UF_READONLY, XAT_READONLY, 6280 xvap.xva_xoptattrs.xoa_readonly); 6281 FLAG_CHECK(UF_SYSTEM, XAT_SYSTEM, 6282 xvap.xva_xoptattrs.xoa_system); 6283 FLAG_CHECK(UF_HIDDEN, XAT_HIDDEN, 6284 xvap.xva_xoptattrs.xoa_hidden); 6285 FLAG_CHECK(UF_REPARSE, XAT_REPARSE, 6286 xvap.xva_xoptattrs.xoa_reparse); 6287 FLAG_CHECK(UF_OFFLINE, XAT_OFFLINE, 6288 xvap.xva_xoptattrs.xoa_offline); 6289 FLAG_CHECK(UF_SPARSE, XAT_SPARSE, 6290 xvap.xva_xoptattrs.xoa_sparse); 6291 6292#undef FLAG_CHECK 6293 *vap = xvap.xva_vattr; 6294 vap->va_flags = fflags; 6295 return (0); 6296} 6297 6298static int 6299zfs_freebsd_setattr(ap) 6300 struct vop_setattr_args /* { 6301 struct vnode *a_vp; 6302 struct vattr *a_vap; 6303 struct ucred *a_cred; 6304 } */ *ap; 6305{ 6306 vnode_t *vp = ap->a_vp; 6307 vattr_t *vap = ap->a_vap; 6308 cred_t *cred = ap->a_cred; 6309 xvattr_t xvap; 6310 u_long fflags; 6311 uint64_t zflags; 6312 6313 vattr_init_mask(vap); 6314 vap->va_mask &= ~AT_NOSET; 6315 6316 xva_init(&xvap); 6317 xvap.xva_vattr = *vap; 6318 6319 zflags = VTOZ(vp)->z_pflags; 6320 6321 if (vap->va_flags != VNOVAL) { 6322 zfsvfs_t *zfsvfs = VTOZ(vp)->z_zfsvfs; 6323 int error; 6324 6325 if (zfsvfs->z_use_fuids == B_FALSE) 6326 return (EOPNOTSUPP); 6327 6328 fflags = vap->va_flags; 6329 /* 6330 * XXX KDM 6331 * We need to figure out whether it makes sense to allow 6332 * UF_REPARSE through, since we don't really have other 6333 * facilities to handle reparse points and zfs_setattr() 6334 * doesn't currently allow setting that attribute anyway. 6335 */ 6336 if ((fflags & ~(SF_IMMUTABLE|SF_APPEND|SF_NOUNLINK|UF_ARCHIVE| 6337 UF_NODUMP|UF_SYSTEM|UF_HIDDEN|UF_READONLY|UF_REPARSE| 6338 UF_OFFLINE|UF_SPARSE)) != 0) 6339 return (EOPNOTSUPP); 6340 /* 6341 * Unprivileged processes are not permitted to unset system 6342 * flags, or modify flags if any system flags are set. 6343 * Privileged non-jail processes may not modify system flags 6344 * if securelevel > 0 and any existing system flags are set. 6345 * Privileged jail processes behave like privileged non-jail 6346 * processes if the security.jail.chflags_allowed sysctl is 6347 * is non-zero; otherwise, they behave like unprivileged 6348 * processes. 6349 */ 6350 if (secpolicy_fs_owner(vp->v_mount, cred) == 0 || 6351 priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0) == 0) { 6352 if (zflags & 6353 (ZFS_IMMUTABLE | ZFS_APPENDONLY | ZFS_NOUNLINK)) { 6354 error = securelevel_gt(cred, 0); 6355 if (error != 0) 6356 return (error); 6357 } 6358 } else { 6359 /* 6360 * Callers may only modify the file flags on objects they 6361 * have VADMIN rights for. 6362 */ 6363 if ((error = VOP_ACCESS(vp, VADMIN, cred, curthread)) != 0) 6364 return (error); 6365 if (zflags & 6366 (ZFS_IMMUTABLE | ZFS_APPENDONLY | ZFS_NOUNLINK)) { 6367 return (EPERM); 6368 } 6369 if (fflags & 6370 (SF_IMMUTABLE | SF_APPEND | SF_NOUNLINK)) { 6371 return (EPERM); 6372 } 6373 } 6374 6375#define FLAG_CHANGE(fflag, zflag, xflag, xfield) do { \ 6376 if (((fflags & (fflag)) && !(zflags & (zflag))) || \ 6377 ((zflags & (zflag)) && !(fflags & (fflag)))) { \ 6378 XVA_SET_REQ(&xvap, (xflag)); \ 6379 (xfield) = ((fflags & (fflag)) != 0); \ 6380 } \ 6381} while (0) 6382 /* Convert chflags into ZFS-type flags. */ 6383 /* XXX: what about SF_SETTABLE?. */ 6384 FLAG_CHANGE(SF_IMMUTABLE, ZFS_IMMUTABLE, XAT_IMMUTABLE, 6385 xvap.xva_xoptattrs.xoa_immutable); 6386 FLAG_CHANGE(SF_APPEND, ZFS_APPENDONLY, XAT_APPENDONLY, 6387 xvap.xva_xoptattrs.xoa_appendonly); 6388 FLAG_CHANGE(SF_NOUNLINK, ZFS_NOUNLINK, XAT_NOUNLINK, 6389 xvap.xva_xoptattrs.xoa_nounlink); 6390 FLAG_CHANGE(UF_ARCHIVE, ZFS_ARCHIVE, XAT_ARCHIVE, 6391 xvap.xva_xoptattrs.xoa_archive); 6392 FLAG_CHANGE(UF_NODUMP, ZFS_NODUMP, XAT_NODUMP, 6393 xvap.xva_xoptattrs.xoa_nodump); 6394 FLAG_CHANGE(UF_READONLY, ZFS_READONLY, XAT_READONLY, 6395 xvap.xva_xoptattrs.xoa_readonly); 6396 FLAG_CHANGE(UF_SYSTEM, ZFS_SYSTEM, XAT_SYSTEM, 6397 xvap.xva_xoptattrs.xoa_system); 6398 FLAG_CHANGE(UF_HIDDEN, ZFS_HIDDEN, XAT_HIDDEN, 6399 xvap.xva_xoptattrs.xoa_hidden); 6400 FLAG_CHANGE(UF_REPARSE, ZFS_REPARSE, XAT_REPARSE, 6401 xvap.xva_xoptattrs.xoa_hidden); 6402 FLAG_CHANGE(UF_OFFLINE, ZFS_OFFLINE, XAT_OFFLINE, 6403 xvap.xva_xoptattrs.xoa_offline); 6404 FLAG_CHANGE(UF_SPARSE, ZFS_SPARSE, XAT_SPARSE, 6405 xvap.xva_xoptattrs.xoa_sparse); 6406#undef FLAG_CHANGE 6407 } 6408 return (zfs_setattr(vp, (vattr_t *)&xvap, 0, cred, NULL)); 6409} 6410 6411static int 6412zfs_freebsd_rename(ap) 6413 struct vop_rename_args /* { 6414 struct vnode *a_fdvp; 6415 struct vnode *a_fvp; 6416 struct componentname *a_fcnp; 6417 struct vnode *a_tdvp; 6418 struct vnode *a_tvp; 6419 struct componentname *a_tcnp; 6420 } */ *ap; 6421{ 6422 vnode_t *fdvp = ap->a_fdvp; 6423 vnode_t *fvp = ap->a_fvp; 6424 vnode_t *tdvp = ap->a_tdvp; 6425 vnode_t *tvp = ap->a_tvp; 6426 int error; 6427 6428 ASSERT(ap->a_fcnp->cn_flags & (SAVENAME|SAVESTART)); 6429 ASSERT(ap->a_tcnp->cn_flags & (SAVENAME|SAVESTART)); 6430 6431 /* 6432 * Check for cross-device rename. 6433 */ 6434 if ((fdvp->v_mount != tdvp->v_mount) || 6435 (tvp && (fdvp->v_mount != tvp->v_mount))) 6436 error = EXDEV; 6437 else 6438 error = zfs_rename(fdvp, ap->a_fcnp->cn_nameptr, tdvp, 6439 ap->a_tcnp->cn_nameptr, ap->a_fcnp->cn_cred, NULL, 0); 6440 if (tdvp == tvp) 6441 VN_RELE(tdvp); 6442 else 6443 VN_URELE(tdvp); 6444 if (tvp) 6445 VN_URELE(tvp); 6446 VN_RELE(fdvp); 6447 VN_RELE(fvp); 6448 6449 return (error); 6450} 6451 6452static int 6453zfs_freebsd_symlink(ap) 6454 struct vop_symlink_args /* { 6455 struct vnode *a_dvp; 6456 struct vnode **a_vpp; 6457 struct componentname *a_cnp; 6458 struct vattr *a_vap; 6459 char *a_target; 6460 } */ *ap; 6461{ 6462 struct componentname *cnp = ap->a_cnp; 6463 vattr_t *vap = ap->a_vap; 6464 6465 ASSERT(cnp->cn_flags & SAVENAME); 6466 6467 vap->va_type = VLNK; /* FreeBSD: Syscall only sets va_mode. */ 6468 vattr_init_mask(vap); 6469 6470 return (zfs_symlink(ap->a_dvp, ap->a_vpp, cnp->cn_nameptr, vap, 6471 ap->a_target, cnp->cn_cred, cnp->cn_thread)); 6472} 6473 6474static int 6475zfs_freebsd_readlink(ap) 6476 struct vop_readlink_args /* { 6477 struct vnode *a_vp; 6478 struct uio *a_uio; 6479 struct ucred *a_cred; 6480 } */ *ap; 6481{ 6482 6483 return (zfs_readlink(ap->a_vp, ap->a_uio, ap->a_cred, NULL)); 6484} 6485 6486static int 6487zfs_freebsd_link(ap) 6488 struct vop_link_args /* { 6489 struct vnode *a_tdvp; 6490 struct vnode *a_vp; 6491 struct componentname *a_cnp; 6492 } */ *ap; 6493{ 6494 struct componentname *cnp = ap->a_cnp; 6495 vnode_t *vp = ap->a_vp; 6496 vnode_t *tdvp = ap->a_tdvp; 6497 6498 if (tdvp->v_mount != vp->v_mount) 6499 return (EXDEV); 6500 6501 ASSERT(cnp->cn_flags & SAVENAME); 6502 6503 return (zfs_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_cred, NULL, 0)); 6504} 6505 6506static int 6507zfs_freebsd_inactive(ap) 6508 struct vop_inactive_args /* { 6509 struct vnode *a_vp; 6510 struct thread *a_td; 6511 } */ *ap; 6512{ 6513 vnode_t *vp = ap->a_vp; 6514 6515 zfs_inactive(vp, ap->a_td->td_ucred, NULL); 6516 return (0); 6517} 6518 6519static int 6520zfs_freebsd_reclaim(ap) 6521 struct vop_reclaim_args /* { 6522 struct vnode *a_vp; 6523 struct thread *a_td; 6524 } */ *ap; 6525{ 6526 vnode_t *vp = ap->a_vp; 6527 znode_t *zp = VTOZ(vp); 6528 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 6529 6530 ASSERT(zp != NULL); 6531 6532 /* Destroy the vm object and flush associated pages. */ 6533 vnode_destroy_vobject(vp); 6534 6535 /* 6536 * z_teardown_inactive_lock protects from a race with 6537 * zfs_znode_dmu_fini in zfsvfs_teardown during 6538 * force unmount. 6539 */ 6540 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER); 6541 if (zp->z_sa_hdl == NULL) 6542 zfs_znode_free(zp); 6543 else 6544 zfs_zinactive(zp); 6545 rw_exit(&zfsvfs->z_teardown_inactive_lock); 6546 6547 vp->v_data = NULL; 6548 return (0); 6549} 6550 6551static int 6552zfs_freebsd_fid(ap) 6553 struct vop_fid_args /* { 6554 struct vnode *a_vp; 6555 struct fid *a_fid; 6556 } */ *ap; 6557{ 6558 6559 return (zfs_fid(ap->a_vp, (void *)ap->a_fid, NULL)); 6560} 6561 6562static int 6563zfs_freebsd_pathconf(ap) 6564 struct vop_pathconf_args /* { 6565 struct vnode *a_vp; 6566 int a_name; 6567 register_t *a_retval; 6568 } */ *ap; 6569{ 6570 ulong_t val; 6571 int error; 6572 6573 error = zfs_pathconf(ap->a_vp, ap->a_name, &val, curthread->td_ucred, NULL); 6574 if (error == 0) 6575 *ap->a_retval = val; 6576 else if (error == EOPNOTSUPP) 6577 error = vop_stdpathconf(ap); 6578 return (error); 6579} 6580 6581static int 6582zfs_freebsd_fifo_pathconf(ap) 6583 struct vop_pathconf_args /* { 6584 struct vnode *a_vp; 6585 int a_name; 6586 register_t *a_retval; 6587 } */ *ap; 6588{ 6589 6590 switch (ap->a_name) { 6591 case _PC_ACL_EXTENDED: 6592 case _PC_ACL_NFS4: 6593 case _PC_ACL_PATH_MAX: 6594 case _PC_MAC_PRESENT: 6595 return (zfs_freebsd_pathconf(ap)); 6596 default: 6597 return (fifo_specops.vop_pathconf(ap)); 6598 } 6599} 6600 6601/* 6602 * FreeBSD's extended attributes namespace defines file name prefix for ZFS' 6603 * extended attribute name: 6604 * 6605 * NAMESPACE PREFIX 6606 * system freebsd:system: 6607 * user (none, can be used to access ZFS fsattr(5) attributes 6608 * created on Solaris) 6609 */ 6610static int 6611zfs_create_attrname(int attrnamespace, const char *name, char *attrname, 6612 size_t size) 6613{ 6614 const char *namespace, *prefix, *suffix; 6615 6616 /* We don't allow '/' character in attribute name. */ 6617 if (strchr(name, '/') != NULL) 6618 return (EINVAL); 6619 /* We don't allow attribute names that start with "freebsd:" string. */ 6620 if (strncmp(name, "freebsd:", 8) == 0) 6621 return (EINVAL); 6622 6623 bzero(attrname, size); 6624 6625 switch (attrnamespace) { 6626 case EXTATTR_NAMESPACE_USER: 6627#if 0 6628 prefix = "freebsd:"; 6629 namespace = EXTATTR_NAMESPACE_USER_STRING; 6630 suffix = ":"; 6631#else 6632 /* 6633 * This is the default namespace by which we can access all 6634 * attributes created on Solaris. 6635 */ 6636 prefix = namespace = suffix = ""; 6637#endif 6638 break; 6639 case EXTATTR_NAMESPACE_SYSTEM: 6640 prefix = "freebsd:"; 6641 namespace = EXTATTR_NAMESPACE_SYSTEM_STRING; 6642 suffix = ":"; 6643 break; 6644 case EXTATTR_NAMESPACE_EMPTY: 6645 default: 6646 return (EINVAL); 6647 } 6648 if (snprintf(attrname, size, "%s%s%s%s", prefix, namespace, suffix, 6649 name) >= size) { 6650 return (ENAMETOOLONG); 6651 } 6652 return (0); 6653} 6654 6655/* 6656 * Vnode operating to retrieve a named extended attribute. 6657 */ 6658static int 6659zfs_getextattr(struct vop_getextattr_args *ap) 6660/* 6661vop_getextattr { 6662 IN struct vnode *a_vp; 6663 IN int a_attrnamespace; 6664 IN const char *a_name; 6665 INOUT struct uio *a_uio; 6666 OUT size_t *a_size; 6667 IN struct ucred *a_cred; 6668 IN struct thread *a_td; 6669}; 6670*/ 6671{ 6672 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6673 struct thread *td = ap->a_td; 6674 struct nameidata nd; 6675 char attrname[255]; 6676 struct vattr va; 6677 vnode_t *xvp = NULL, *vp; 6678 int error, flags; 6679 6680 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6681 ap->a_cred, ap->a_td, VREAD); 6682 if (error != 0) 6683 return (error); 6684 6685 error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, 6686 sizeof(attrname)); 6687 if (error != 0) 6688 return (error); 6689 6690 ZFS_ENTER(zfsvfs); 6691 6692 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6693 LOOKUP_XATTR); 6694 if (error != 0) { 6695 ZFS_EXIT(zfsvfs); 6696 return (error); 6697 } 6698 6699 flags = FREAD; 6700 NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, attrname, 6701 xvp, td); 6702 error = vn_open_cred(&nd, &flags, 0, 0, ap->a_cred, NULL); 6703 vp = nd.ni_vp; 6704 NDFREE(&nd, NDF_ONLY_PNBUF); 6705 if (error != 0) { 6706 ZFS_EXIT(zfsvfs); 6707 if (error == ENOENT) 6708 error = ENOATTR; 6709 return (error); 6710 } 6711 6712 if (ap->a_size != NULL) { 6713 error = VOP_GETATTR(vp, &va, ap->a_cred); 6714 if (error == 0) 6715 *ap->a_size = (size_t)va.va_size; 6716 } else if (ap->a_uio != NULL) 6717 error = VOP_READ(vp, ap->a_uio, IO_UNIT, ap->a_cred); 6718 6719 VOP_UNLOCK(vp, 0); 6720 vn_close(vp, flags, ap->a_cred, td); 6721 ZFS_EXIT(zfsvfs); 6722 6723 return (error); 6724} 6725 6726/* 6727 * Vnode operation to remove a named attribute. 6728 */ 6729int 6730zfs_deleteextattr(struct vop_deleteextattr_args *ap) 6731/* 6732vop_deleteextattr { 6733 IN struct vnode *a_vp; 6734 IN int a_attrnamespace; 6735 IN const char *a_name; 6736 IN struct ucred *a_cred; 6737 IN struct thread *a_td; 6738}; 6739*/ 6740{ 6741 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6742 struct thread *td = ap->a_td; 6743 struct nameidata nd; 6744 char attrname[255]; 6745 struct vattr va; 6746 vnode_t *xvp = NULL, *vp; 6747 int error, flags; 6748 6749 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6750 ap->a_cred, ap->a_td, VWRITE); 6751 if (error != 0) 6752 return (error); 6753 6754 error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, 6755 sizeof(attrname)); 6756 if (error != 0) 6757 return (error); 6758 6759 ZFS_ENTER(zfsvfs); 6760 6761 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6762 LOOKUP_XATTR); 6763 if (error != 0) { 6764 ZFS_EXIT(zfsvfs); 6765 return (error); 6766 } 6767 6768 NDINIT_ATVP(&nd, DELETE, NOFOLLOW | LOCKPARENT | LOCKLEAF, 6769 UIO_SYSSPACE, attrname, xvp, td); 6770 error = namei(&nd); 6771 vp = nd.ni_vp; 6772 if (error != 0) { 6773 ZFS_EXIT(zfsvfs); 6774 NDFREE(&nd, NDF_ONLY_PNBUF); 6775 if (error == ENOENT) 6776 error = ENOATTR; 6777 return (error); 6778 } 6779 6780 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 6781 NDFREE(&nd, NDF_ONLY_PNBUF); 6782 6783 vput(nd.ni_dvp); 6784 if (vp == nd.ni_dvp) 6785 vrele(vp); 6786 else 6787 vput(vp); 6788 ZFS_EXIT(zfsvfs); 6789 6790 return (error); 6791} 6792 6793/* 6794 * Vnode operation to set a named attribute. 6795 */ 6796static int 6797zfs_setextattr(struct vop_setextattr_args *ap) 6798/* 6799vop_setextattr { 6800 IN struct vnode *a_vp; 6801 IN int a_attrnamespace; 6802 IN const char *a_name; 6803 INOUT struct uio *a_uio; 6804 IN struct ucred *a_cred; 6805 IN struct thread *a_td; 6806}; 6807*/ 6808{ 6809 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6810 struct thread *td = ap->a_td; 6811 struct nameidata nd; 6812 char attrname[255]; 6813 struct vattr va; 6814 vnode_t *xvp = NULL, *vp; 6815 int error, flags; 6816 6817 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6818 ap->a_cred, ap->a_td, VWRITE); 6819 if (error != 0) 6820 return (error); 6821 6822 error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, 6823 sizeof(attrname)); 6824 if (error != 0) 6825 return (error); 6826 6827 ZFS_ENTER(zfsvfs); 6828 6829 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6830 LOOKUP_XATTR | CREATE_XATTR_DIR); 6831 if (error != 0) { 6832 ZFS_EXIT(zfsvfs); 6833 return (error); 6834 } 6835 6836 flags = FFLAGS(O_WRONLY | O_CREAT); 6837 NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, attrname, 6838 xvp, td); 6839 error = vn_open_cred(&nd, &flags, 0600, 0, ap->a_cred, NULL); 6840 vp = nd.ni_vp; 6841 NDFREE(&nd, NDF_ONLY_PNBUF); 6842 if (error != 0) { 6843 ZFS_EXIT(zfsvfs); 6844 return (error); 6845 } 6846 6847 VATTR_NULL(&va); 6848 va.va_size = 0; 6849 error = VOP_SETATTR(vp, &va, ap->a_cred); 6850 if (error == 0) 6851 VOP_WRITE(vp, ap->a_uio, IO_UNIT | IO_SYNC, ap->a_cred); 6852 6853 VOP_UNLOCK(vp, 0); 6854 vn_close(vp, flags, ap->a_cred, td); 6855 ZFS_EXIT(zfsvfs); 6856 6857 return (error); 6858} 6859 6860/* 6861 * Vnode operation to retrieve extended attributes on a vnode. 6862 */ 6863static int 6864zfs_listextattr(struct vop_listextattr_args *ap) 6865/* 6866vop_listextattr { 6867 IN struct vnode *a_vp; 6868 IN int a_attrnamespace; 6869 INOUT struct uio *a_uio; 6870 OUT size_t *a_size; 6871 IN struct ucred *a_cred; 6872 IN struct thread *a_td; 6873}; 6874*/ 6875{ 6876 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6877 struct thread *td = ap->a_td; 6878 struct nameidata nd; 6879 char attrprefix[16]; 6880 u_char dirbuf[sizeof(struct dirent)]; 6881 struct dirent *dp; 6882 struct iovec aiov; 6883 struct uio auio, *uio = ap->a_uio; 6884 size_t *sizep = ap->a_size; 6885 size_t plen; 6886 vnode_t *xvp = NULL, *vp; 6887 int done, error, eof, pos; 6888 6889 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6890 ap->a_cred, ap->a_td, VREAD); 6891 if (error != 0) 6892 return (error); 6893 6894 error = zfs_create_attrname(ap->a_attrnamespace, "", attrprefix, 6895 sizeof(attrprefix)); 6896 if (error != 0) 6897 return (error); 6898 plen = strlen(attrprefix); 6899 6900 ZFS_ENTER(zfsvfs); 6901 6902 if (sizep != NULL) 6903 *sizep = 0; 6904 6905 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6906 LOOKUP_XATTR); 6907 if (error != 0) { 6908 ZFS_EXIT(zfsvfs); 6909 /* 6910 * ENOATTR means that the EA directory does not yet exist, 6911 * i.e. there are no extended attributes there. 6912 */ 6913 if (error == ENOATTR) 6914 error = 0; 6915 return (error); 6916 } 6917 6918 NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKSHARED, 6919 UIO_SYSSPACE, ".", xvp, td); 6920 error = namei(&nd); 6921 vp = nd.ni_vp; 6922 NDFREE(&nd, NDF_ONLY_PNBUF); 6923 if (error != 0) { 6924 ZFS_EXIT(zfsvfs); 6925 return (error); 6926 } 6927 6928 auio.uio_iov = &aiov; 6929 auio.uio_iovcnt = 1; 6930 auio.uio_segflg = UIO_SYSSPACE; 6931 auio.uio_td = td; 6932 auio.uio_rw = UIO_READ; 6933 auio.uio_offset = 0; 6934 6935 do { 6936 u_char nlen; 6937 6938 aiov.iov_base = (void *)dirbuf; 6939 aiov.iov_len = sizeof(dirbuf); 6940 auio.uio_resid = sizeof(dirbuf); 6941 error = VOP_READDIR(vp, &auio, ap->a_cred, &eof, NULL, NULL); 6942 done = sizeof(dirbuf) - auio.uio_resid; 6943 if (error != 0) 6944 break; 6945 for (pos = 0; pos < done;) { 6946 dp = (struct dirent *)(dirbuf + pos); 6947 pos += dp->d_reclen; 6948 /* 6949 * XXX: Temporarily we also accept DT_UNKNOWN, as this 6950 * is what we get when attribute was created on Solaris. 6951 */ 6952 if (dp->d_type != DT_REG && dp->d_type != DT_UNKNOWN) 6953 continue; 6954 if (plen == 0 && strncmp(dp->d_name, "freebsd:", 8) == 0) 6955 continue; 6956 else if (strncmp(dp->d_name, attrprefix, plen) != 0) 6957 continue; 6958 nlen = dp->d_namlen - plen; 6959 if (sizep != NULL) 6960 *sizep += 1 + nlen; 6961 else if (uio != NULL) { 6962 /* 6963 * Format of extattr name entry is one byte for 6964 * length and the rest for name. 6965 */ 6966 error = uiomove(&nlen, 1, uio->uio_rw, uio); 6967 if (error == 0) { 6968 error = uiomove(dp->d_name + plen, nlen, 6969 uio->uio_rw, uio); 6970 } 6971 if (error != 0) 6972 break; 6973 } 6974 } 6975 } while (!eof && error == 0); 6976 6977 vput(vp); 6978 ZFS_EXIT(zfsvfs); 6979 6980 return (error); 6981} 6982 6983int 6984zfs_freebsd_getacl(ap) 6985 struct vop_getacl_args /* { 6986 struct vnode *vp; 6987 acl_type_t type; 6988 struct acl *aclp; 6989 struct ucred *cred; 6990 struct thread *td; 6991 } */ *ap; 6992{ 6993 int error; 6994 vsecattr_t vsecattr; 6995 6996 if (ap->a_type != ACL_TYPE_NFS4) 6997 return (EINVAL); 6998 6999 vsecattr.vsa_mask = VSA_ACE | VSA_ACECNT; 7000 if (error = zfs_getsecattr(ap->a_vp, &vsecattr, 0, ap->a_cred, NULL)) 7001 return (error); 7002 7003 error = acl_from_aces(ap->a_aclp, vsecattr.vsa_aclentp, vsecattr.vsa_aclcnt); 7004 if (vsecattr.vsa_aclentp != NULL) 7005 kmem_free(vsecattr.vsa_aclentp, vsecattr.vsa_aclentsz); 7006 7007 return (error); 7008} 7009 7010int 7011zfs_freebsd_setacl(ap) 7012 struct vop_setacl_args /* { 7013 struct vnode *vp; 7014 acl_type_t type; 7015 struct acl *aclp; 7016 struct ucred *cred; 7017 struct thread *td; 7018 } */ *ap; 7019{ 7020 int error; 7021 vsecattr_t vsecattr; 7022 int aclbsize; /* size of acl list in bytes */ 7023 aclent_t *aaclp; 7024 7025 if (ap->a_type != ACL_TYPE_NFS4) 7026 return (EINVAL); 7027 7028 if (ap->a_aclp->acl_cnt < 1 || ap->a_aclp->acl_cnt > MAX_ACL_ENTRIES) 7029 return (EINVAL); 7030 7031 /* 7032 * With NFSv4 ACLs, chmod(2) may need to add additional entries, 7033 * splitting every entry into two and appending "canonical six" 7034 * entries at the end. Don't allow for setting an ACL that would 7035 * cause chmod(2) to run out of ACL entries. 7036 */ 7037 if (ap->a_aclp->acl_cnt * 2 + 6 > ACL_MAX_ENTRIES) 7038 return (ENOSPC); 7039 7040 error = acl_nfs4_check(ap->a_aclp, ap->a_vp->v_type == VDIR); 7041 if (error != 0) 7042 return (error); 7043 7044 vsecattr.vsa_mask = VSA_ACE; 7045 aclbsize = ap->a_aclp->acl_cnt * sizeof(ace_t); 7046 vsecattr.vsa_aclentp = kmem_alloc(aclbsize, KM_SLEEP); 7047 aaclp = vsecattr.vsa_aclentp; 7048 vsecattr.vsa_aclentsz = aclbsize; 7049 7050 aces_from_acl(vsecattr.vsa_aclentp, &vsecattr.vsa_aclcnt, ap->a_aclp); 7051 error = zfs_setsecattr(ap->a_vp, &vsecattr, 0, ap->a_cred, NULL); 7052 kmem_free(aaclp, aclbsize); 7053 7054 return (error); 7055} 7056 7057int 7058zfs_freebsd_aclcheck(ap) 7059 struct vop_aclcheck_args /* { 7060 struct vnode *vp; 7061 acl_type_t type; 7062 struct acl *aclp; 7063 struct ucred *cred; 7064 struct thread *td; 7065 } */ *ap; 7066{ 7067 7068 return (EOPNOTSUPP); 7069} 7070 7071struct vop_vector zfs_vnodeops; 7072struct vop_vector zfs_fifoops; 7073struct vop_vector zfs_shareops; 7074 7075struct vop_vector zfs_vnodeops = { 7076 .vop_default = &default_vnodeops, 7077 .vop_inactive = zfs_freebsd_inactive, 7078 .vop_reclaim = zfs_freebsd_reclaim, 7079 .vop_access = zfs_freebsd_access, 7080#ifdef FREEBSD_NAMECACHE 7081 .vop_lookup = vfs_cache_lookup, 7082 .vop_cachedlookup = zfs_freebsd_lookup, 7083#else 7084 .vop_lookup = zfs_freebsd_lookup, 7085#endif 7086 .vop_getattr = zfs_freebsd_getattr, 7087 .vop_setattr = zfs_freebsd_setattr, 7088 .vop_create = zfs_freebsd_create, 7089 .vop_mknod = zfs_freebsd_create, 7090 .vop_mkdir = zfs_freebsd_mkdir, 7091 .vop_readdir = zfs_freebsd_readdir, 7092 .vop_fsync = zfs_freebsd_fsync, 7093 .vop_open = zfs_freebsd_open, 7094 .vop_close = zfs_freebsd_close, 7095 .vop_rmdir = zfs_freebsd_rmdir, 7096 .vop_ioctl = zfs_freebsd_ioctl, 7097 .vop_link = zfs_freebsd_link, 7098 .vop_symlink = zfs_freebsd_symlink, 7099 .vop_readlink = zfs_freebsd_readlink, 7100 .vop_read = zfs_freebsd_read, 7101 .vop_write = zfs_freebsd_write, 7102 .vop_remove = zfs_freebsd_remove, 7103 .vop_rename = zfs_freebsd_rename, 7104 .vop_pathconf = zfs_freebsd_pathconf, 7105 .vop_bmap = zfs_freebsd_bmap, 7106 .vop_fid = zfs_freebsd_fid, 7107 .vop_getextattr = zfs_getextattr, 7108 .vop_deleteextattr = zfs_deleteextattr, 7109 .vop_setextattr = zfs_setextattr, 7110 .vop_listextattr = zfs_listextattr, 7111 .vop_getacl = zfs_freebsd_getacl, 7112 .vop_setacl = zfs_freebsd_setacl, 7113 .vop_aclcheck = zfs_freebsd_aclcheck, 7114 .vop_getpages = zfs_freebsd_getpages, 7115 .vop_putpages = zfs_freebsd_putpages, 7116}; 7117 7118struct vop_vector zfs_fifoops = { 7119 .vop_default = &fifo_specops, 7120 .vop_fsync = zfs_freebsd_fsync, 7121 .vop_access = zfs_freebsd_access, 7122 .vop_getattr = zfs_freebsd_getattr, 7123 .vop_inactive = zfs_freebsd_inactive, 7124 .vop_read = VOP_PANIC, 7125 .vop_reclaim = zfs_freebsd_reclaim, 7126 .vop_setattr = zfs_freebsd_setattr, 7127 .vop_write = VOP_PANIC, 7128 .vop_pathconf = zfs_freebsd_fifo_pathconf, 7129 .vop_fid = zfs_freebsd_fid, 7130 .vop_getacl = zfs_freebsd_getacl, 7131 .vop_setacl = zfs_freebsd_setacl, 7132 .vop_aclcheck = zfs_freebsd_aclcheck, 7133}; 7134 7135/* 7136 * special share hidden files vnode operations template 7137 */ 7138struct vop_vector zfs_shareops = { 7139 .vop_default = &default_vnodeops, 7140 .vop_access = zfs_freebsd_access, 7141 .vop_inactive = zfs_freebsd_inactive, 7142 .vop_reclaim = zfs_freebsd_reclaim, 7143 .vop_fid = zfs_freebsd_fid, 7144 .vop_pathconf = zfs_freebsd_pathconf, 7145}; 7146