zfs_vnops.c revision 276081
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) 2012, 2014 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 if (error == ESRCH) 270 return (SET_ERROR(ENXIO)); 271 272 /* 273 * We could find a hole that begins after the logical end-of-file, 274 * because dmu_offset_next() only works on whole blocks. If the 275 * EOF falls mid-block, then indicate that the "virtual hole" 276 * at the end of the file begins at the logical EOF, rather than 277 * at the end of the last block. 278 */ 279 if (noff > file_sz) { 280 ASSERT(hole); 281 noff = file_sz; 282 } 283 284 if (noff < *off) 285 return (error); 286 *off = noff; 287 return (error); 288} 289 290/* ARGSUSED */ 291static int 292zfs_ioctl(vnode_t *vp, u_long com, intptr_t data, int flag, cred_t *cred, 293 int *rvalp, caller_context_t *ct) 294{ 295 offset_t off; 296 int error; 297 zfsvfs_t *zfsvfs; 298 znode_t *zp; 299 300 switch (com) { 301 case _FIOFFS: 302 return (0); 303 304 /* 305 * The following two ioctls are used by bfu. Faking out, 306 * necessary to avoid bfu errors. 307 */ 308 case _FIOGDIO: 309 case _FIOSDIO: 310 return (0); 311 312 case _FIO_SEEK_DATA: 313 case _FIO_SEEK_HOLE: 314#ifdef sun 315 if (ddi_copyin((void *)data, &off, sizeof (off), flag)) 316 return (SET_ERROR(EFAULT)); 317#else 318 off = *(offset_t *)data; 319#endif 320 zp = VTOZ(vp); 321 zfsvfs = zp->z_zfsvfs; 322 ZFS_ENTER(zfsvfs); 323 ZFS_VERIFY_ZP(zp); 324 325 /* offset parameter is in/out */ 326 error = zfs_holey(vp, com, &off); 327 ZFS_EXIT(zfsvfs); 328 if (error) 329 return (error); 330#ifdef sun 331 if (ddi_copyout(&off, (void *)data, sizeof (off), flag)) 332 return (SET_ERROR(EFAULT)); 333#else 334 *(offset_t *)data = off; 335#endif 336 return (0); 337 } 338 return (SET_ERROR(ENOTTY)); 339} 340 341static vm_page_t 342page_busy(vnode_t *vp, int64_t start, int64_t off, int64_t nbytes) 343{ 344 vm_object_t obj; 345 vm_page_t pp; 346 int64_t end; 347 348 /* 349 * At present vm_page_clear_dirty extends the cleared range to DEV_BSIZE 350 * aligned boundaries, if the range is not aligned. As a result a 351 * DEV_BSIZE subrange with partially dirty data may get marked as clean. 352 * It may happen that all DEV_BSIZE subranges are marked clean and thus 353 * the whole page would be considred clean despite have some dirty data. 354 * For this reason we should shrink the range to DEV_BSIZE aligned 355 * boundaries before calling vm_page_clear_dirty. 356 */ 357 end = rounddown2(off + nbytes, DEV_BSIZE); 358 off = roundup2(off, DEV_BSIZE); 359 nbytes = end - off; 360 361 obj = vp->v_object; 362 zfs_vmobject_assert_wlocked(obj); 363 364 for (;;) { 365 if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL && 366 pp->valid) { 367 if (vm_page_xbusied(pp)) { 368 /* 369 * Reference the page before unlocking and 370 * sleeping so that the page daemon is less 371 * likely to reclaim it. 372 */ 373 vm_page_reference(pp); 374 vm_page_lock(pp); 375 zfs_vmobject_wunlock(obj); 376 vm_page_busy_sleep(pp, "zfsmwb"); 377 zfs_vmobject_wlock(obj); 378 continue; 379 } 380 vm_page_sbusy(pp); 381 } else if (pp == NULL) { 382 pp = vm_page_alloc(obj, OFF_TO_IDX(start), 383 VM_ALLOC_SYSTEM | VM_ALLOC_IFCACHED | 384 VM_ALLOC_SBUSY); 385 } else { 386 ASSERT(pp != NULL && !pp->valid); 387 pp = NULL; 388 } 389 390 if (pp != NULL) { 391 ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL); 392 vm_object_pip_add(obj, 1); 393 pmap_remove_write(pp); 394 if (nbytes != 0) 395 vm_page_clear_dirty(pp, off, nbytes); 396 } 397 break; 398 } 399 return (pp); 400} 401 402static void 403page_unbusy(vm_page_t pp) 404{ 405 406 vm_page_sunbusy(pp); 407 vm_object_pip_subtract(pp->object, 1); 408} 409 410static vm_page_t 411page_hold(vnode_t *vp, int64_t start) 412{ 413 vm_object_t obj; 414 vm_page_t pp; 415 416 obj = vp->v_object; 417 zfs_vmobject_assert_wlocked(obj); 418 419 for (;;) { 420 if ((pp = vm_page_lookup(obj, OFF_TO_IDX(start))) != NULL && 421 pp->valid) { 422 if (vm_page_xbusied(pp)) { 423 /* 424 * Reference the page before unlocking and 425 * sleeping so that the page daemon is less 426 * likely to reclaim it. 427 */ 428 vm_page_reference(pp); 429 vm_page_lock(pp); 430 zfs_vmobject_wunlock(obj); 431 vm_page_busy_sleep(pp, "zfsmwb"); 432 zfs_vmobject_wlock(obj); 433 continue; 434 } 435 436 ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL); 437 vm_page_lock(pp); 438 vm_page_hold(pp); 439 vm_page_unlock(pp); 440 441 } else 442 pp = NULL; 443 break; 444 } 445 return (pp); 446} 447 448static void 449page_unhold(vm_page_t pp) 450{ 451 452 vm_page_lock(pp); 453 vm_page_unhold(pp); 454 vm_page_unlock(pp); 455} 456 457/* 458 * When a file is memory mapped, we must keep the IO data synchronized 459 * between the DMU cache and the memory mapped pages. What this means: 460 * 461 * On Write: If we find a memory mapped page, we write to *both* 462 * the page and the dmu buffer. 463 */ 464static void 465update_pages(vnode_t *vp, int64_t start, int len, objset_t *os, uint64_t oid, 466 int segflg, dmu_tx_t *tx) 467{ 468 vm_object_t obj; 469 struct sf_buf *sf; 470 caddr_t va; 471 int off; 472 473 ASSERT(segflg != UIO_NOCOPY); 474 ASSERT(vp->v_mount != NULL); 475 obj = vp->v_object; 476 ASSERT(obj != NULL); 477 478 off = start & PAGEOFFSET; 479 zfs_vmobject_wlock(obj); 480 for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 481 vm_page_t pp; 482 int nbytes = imin(PAGESIZE - off, len); 483 484 if ((pp = page_busy(vp, start, off, nbytes)) != NULL) { 485 zfs_vmobject_wunlock(obj); 486 487 va = zfs_map_page(pp, &sf); 488 (void) dmu_read(os, oid, start+off, nbytes, 489 va+off, DMU_READ_PREFETCH);; 490 zfs_unmap_page(sf); 491 492 zfs_vmobject_wlock(obj); 493 page_unbusy(pp); 494 } 495 len -= nbytes; 496 off = 0; 497 } 498 vm_object_pip_wakeupn(obj, 0); 499 zfs_vmobject_wunlock(obj); 500} 501 502/* 503 * Read with UIO_NOCOPY flag means that sendfile(2) requests 504 * ZFS to populate a range of page cache pages with data. 505 * 506 * NOTE: this function could be optimized to pre-allocate 507 * all pages in advance, drain exclusive busy on all of them, 508 * map them into contiguous KVA region and populate them 509 * in one single dmu_read() call. 510 */ 511static int 512mappedread_sf(vnode_t *vp, int nbytes, uio_t *uio) 513{ 514 znode_t *zp = VTOZ(vp); 515 objset_t *os = zp->z_zfsvfs->z_os; 516 struct sf_buf *sf; 517 vm_object_t obj; 518 vm_page_t pp; 519 int64_t start; 520 caddr_t va; 521 int len = nbytes; 522 int off; 523 int error = 0; 524 525 ASSERT(uio->uio_segflg == UIO_NOCOPY); 526 ASSERT(vp->v_mount != NULL); 527 obj = vp->v_object; 528 ASSERT(obj != NULL); 529 ASSERT((uio->uio_loffset & PAGEOFFSET) == 0); 530 531 zfs_vmobject_wlock(obj); 532 for (start = uio->uio_loffset; len > 0; start += PAGESIZE) { 533 int bytes = MIN(PAGESIZE, len); 534 535 pp = vm_page_grab(obj, OFF_TO_IDX(start), VM_ALLOC_SBUSY | 536 VM_ALLOC_NORMAL | VM_ALLOC_IGN_SBUSY); 537 if (pp->valid == 0) { 538 zfs_vmobject_wunlock(obj); 539 va = zfs_map_page(pp, &sf); 540 error = dmu_read(os, zp->z_id, start, bytes, va, 541 DMU_READ_PREFETCH); 542 if (bytes != PAGESIZE && error == 0) 543 bzero(va + bytes, PAGESIZE - bytes); 544 zfs_unmap_page(sf); 545 zfs_vmobject_wlock(obj); 546 vm_page_sunbusy(pp); 547 vm_page_lock(pp); 548 if (error) { 549 if (pp->wire_count == 0 && pp->valid == 0 && 550 !vm_page_busied(pp)) 551 vm_page_free(pp); 552 } else { 553 pp->valid = VM_PAGE_BITS_ALL; 554 vm_page_activate(pp); 555 } 556 vm_page_unlock(pp); 557 } else { 558 ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL); 559 vm_page_sunbusy(pp); 560 } 561 if (error) 562 break; 563 uio->uio_resid -= bytes; 564 uio->uio_offset += bytes; 565 len -= bytes; 566 } 567 zfs_vmobject_wunlock(obj); 568 return (error); 569} 570 571/* 572 * When a file is memory mapped, we must keep the IO data synchronized 573 * between the DMU cache and the memory mapped pages. What this means: 574 * 575 * On Read: We "read" preferentially from memory mapped pages, 576 * else we default from the dmu buffer. 577 * 578 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when 579 * the file is memory mapped. 580 */ 581static int 582mappedread(vnode_t *vp, int nbytes, uio_t *uio) 583{ 584 znode_t *zp = VTOZ(vp); 585 vm_object_t obj; 586 int64_t start; 587 caddr_t va; 588 int len = nbytes; 589 int off; 590 int error = 0; 591 592 ASSERT(vp->v_mount != NULL); 593 obj = vp->v_object; 594 ASSERT(obj != NULL); 595 596 start = uio->uio_loffset; 597 off = start & PAGEOFFSET; 598 zfs_vmobject_wlock(obj); 599 for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 600 vm_page_t pp; 601 uint64_t bytes = MIN(PAGESIZE - off, len); 602 603 if (pp = page_hold(vp, start)) { 604 struct sf_buf *sf; 605 caddr_t va; 606 607 zfs_vmobject_wunlock(obj); 608 va = zfs_map_page(pp, &sf); 609 error = uiomove(va + off, bytes, UIO_READ, uio); 610 zfs_unmap_page(sf); 611 zfs_vmobject_wlock(obj); 612 page_unhold(pp); 613 } else { 614 zfs_vmobject_wunlock(obj); 615 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl), 616 uio, bytes); 617 zfs_vmobject_wlock(obj); 618 } 619 len -= bytes; 620 off = 0; 621 if (error) 622 break; 623 } 624 zfs_vmobject_wunlock(obj); 625 return (error); 626} 627 628offset_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */ 629 630/* 631 * Read bytes from specified file into supplied buffer. 632 * 633 * IN: vp - vnode of file to be read from. 634 * uio - structure supplying read location, range info, 635 * and return buffer. 636 * ioflag - SYNC flags; used to provide FRSYNC semantics. 637 * cr - credentials of caller. 638 * ct - caller context 639 * 640 * OUT: uio - updated offset and range, buffer filled. 641 * 642 * RETURN: 0 on success, error code on failure. 643 * 644 * Side Effects: 645 * vp - atime updated if byte count > 0 646 */ 647/* ARGSUSED */ 648static int 649zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 650{ 651 znode_t *zp = VTOZ(vp); 652 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 653 ssize_t n, nbytes; 654 int error = 0; 655 rl_t *rl; 656 xuio_t *xuio = NULL; 657 658 ZFS_ENTER(zfsvfs); 659 ZFS_VERIFY_ZP(zp); 660 661 if (zp->z_pflags & ZFS_AV_QUARANTINED) { 662 ZFS_EXIT(zfsvfs); 663 return (SET_ERROR(EACCES)); 664 } 665 666 /* 667 * Validate file offset 668 */ 669 if (uio->uio_loffset < (offset_t)0) { 670 ZFS_EXIT(zfsvfs); 671 return (SET_ERROR(EINVAL)); 672 } 673 674 /* 675 * Fasttrack empty reads 676 */ 677 if (uio->uio_resid == 0) { 678 ZFS_EXIT(zfsvfs); 679 return (0); 680 } 681 682 /* 683 * Check for mandatory locks 684 */ 685 if (MANDMODE(zp->z_mode)) { 686 if (error = chklock(vp, FREAD, 687 uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) { 688 ZFS_EXIT(zfsvfs); 689 return (error); 690 } 691 } 692 693 /* 694 * If we're in FRSYNC mode, sync out this znode before reading it. 695 */ 696 if (zfsvfs->z_log && 697 (ioflag & FRSYNC || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)) 698 zil_commit(zfsvfs->z_log, zp->z_id); 699 700 /* 701 * Lock the range against changes. 702 */ 703 rl = zfs_range_lock(zp, uio->uio_loffset, uio->uio_resid, RL_READER); 704 705 /* 706 * If we are reading past end-of-file we can skip 707 * to the end; but we might still need to set atime. 708 */ 709 if (uio->uio_loffset >= zp->z_size) { 710 error = 0; 711 goto out; 712 } 713 714 ASSERT(uio->uio_loffset < zp->z_size); 715 n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset); 716 717#ifdef sun 718 if ((uio->uio_extflg == UIO_XUIO) && 719 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) { 720 int nblk; 721 int blksz = zp->z_blksz; 722 uint64_t offset = uio->uio_loffset; 723 724 xuio = (xuio_t *)uio; 725 if ((ISP2(blksz))) { 726 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset, 727 blksz)) / blksz; 728 } else { 729 ASSERT(offset + n <= blksz); 730 nblk = 1; 731 } 732 (void) dmu_xuio_init(xuio, nblk); 733 734 if (vn_has_cached_data(vp)) { 735 /* 736 * For simplicity, we always allocate a full buffer 737 * even if we only expect to read a portion of a block. 738 */ 739 while (--nblk >= 0) { 740 (void) dmu_xuio_add(xuio, 741 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 742 blksz), 0, blksz); 743 } 744 } 745 } 746#endif /* sun */ 747 748 while (n > 0) { 749 nbytes = MIN(n, zfs_read_chunk_size - 750 P2PHASE(uio->uio_loffset, zfs_read_chunk_size)); 751 752#ifdef __FreeBSD__ 753 if (uio->uio_segflg == UIO_NOCOPY) 754 error = mappedread_sf(vp, nbytes, uio); 755 else 756#endif /* __FreeBSD__ */ 757 if (vn_has_cached_data(vp)) { 758 error = mappedread(vp, nbytes, uio); 759 } else { 760 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl), 761 uio, nbytes); 762 } 763 if (error) { 764 /* convert checksum errors into IO errors */ 765 if (error == ECKSUM) 766 error = SET_ERROR(EIO); 767 break; 768 } 769 770 n -= nbytes; 771 } 772out: 773 zfs_range_unlock(rl); 774 775 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 776 ZFS_EXIT(zfsvfs); 777 return (error); 778} 779 780/* 781 * Write the bytes to a file. 782 * 783 * IN: vp - vnode of file to be written to. 784 * uio - structure supplying write location, range info, 785 * and data buffer. 786 * ioflag - FAPPEND, FSYNC, and/or FDSYNC. FAPPEND is 787 * set if in append mode. 788 * cr - credentials of caller. 789 * ct - caller context (NFS/CIFS fem monitor only) 790 * 791 * OUT: uio - updated offset and range. 792 * 793 * RETURN: 0 on success, error code on failure. 794 * 795 * Timestamps: 796 * vp - ctime|mtime updated if byte count > 0 797 */ 798 799/* ARGSUSED */ 800static int 801zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 802{ 803 znode_t *zp = VTOZ(vp); 804 rlim64_t limit = MAXOFFSET_T; 805 ssize_t start_resid = uio->uio_resid; 806 ssize_t tx_bytes; 807 uint64_t end_size; 808 dmu_tx_t *tx; 809 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 810 zilog_t *zilog; 811 offset_t woff; 812 ssize_t n, nbytes; 813 rl_t *rl; 814 int max_blksz = zfsvfs->z_max_blksz; 815 int error = 0; 816 arc_buf_t *abuf; 817 iovec_t *aiov = NULL; 818 xuio_t *xuio = NULL; 819 int i_iov = 0; 820 int iovcnt = uio->uio_iovcnt; 821 iovec_t *iovp = uio->uio_iov; 822 int write_eof; 823 int count = 0; 824 sa_bulk_attr_t bulk[4]; 825 uint64_t mtime[2], ctime[2]; 826 827 /* 828 * Fasttrack empty write 829 */ 830 n = start_resid; 831 if (n == 0) 832 return (0); 833 834 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T) 835 limit = MAXOFFSET_T; 836 837 ZFS_ENTER(zfsvfs); 838 ZFS_VERIFY_ZP(zp); 839 840 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); 841 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); 842 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 843 &zp->z_size, 8); 844 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 845 &zp->z_pflags, 8); 846 847 /* 848 * If immutable or not appending then return EPERM 849 */ 850 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) || 851 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) && 852 (uio->uio_loffset < zp->z_size))) { 853 ZFS_EXIT(zfsvfs); 854 return (SET_ERROR(EPERM)); 855 } 856 857 zilog = zfsvfs->z_log; 858 859 /* 860 * Validate file offset 861 */ 862 woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset; 863 if (woff < 0) { 864 ZFS_EXIT(zfsvfs); 865 return (SET_ERROR(EINVAL)); 866 } 867 868 /* 869 * Check for mandatory locks before calling zfs_range_lock() 870 * in order to prevent a deadlock with locks set via fcntl(). 871 */ 872 if (MANDMODE((mode_t)zp->z_mode) && 873 (error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) { 874 ZFS_EXIT(zfsvfs); 875 return (error); 876 } 877 878#ifdef sun 879 /* 880 * Pre-fault the pages to ensure slow (eg NFS) pages 881 * don't hold up txg. 882 * Skip this if uio contains loaned arc_buf. 883 */ 884 if ((uio->uio_extflg == UIO_XUIO) && 885 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) 886 xuio = (xuio_t *)uio; 887 else 888 uio_prefaultpages(MIN(n, max_blksz), uio); 889#endif /* sun */ 890 891 /* 892 * If in append mode, set the io offset pointer to eof. 893 */ 894 if (ioflag & FAPPEND) { 895 /* 896 * Obtain an appending range lock to guarantee file append 897 * semantics. We reset the write offset once we have the lock. 898 */ 899 rl = zfs_range_lock(zp, 0, n, RL_APPEND); 900 woff = rl->r_off; 901 if (rl->r_len == UINT64_MAX) { 902 /* 903 * We overlocked the file because this write will cause 904 * the file block size to increase. 905 * Note that zp_size cannot change with this lock held. 906 */ 907 woff = zp->z_size; 908 } 909 uio->uio_loffset = woff; 910 } else { 911 /* 912 * Note that if the file block size will change as a result of 913 * this write, then this range lock will lock the entire file 914 * so that we can re-write the block safely. 915 */ 916 rl = zfs_range_lock(zp, woff, n, RL_WRITER); 917 } 918 919 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) { 920 zfs_range_unlock(rl); 921 ZFS_EXIT(zfsvfs); 922 return (EFBIG); 923 } 924 925 if (woff >= limit) { 926 zfs_range_unlock(rl); 927 ZFS_EXIT(zfsvfs); 928 return (SET_ERROR(EFBIG)); 929 } 930 931 if ((woff + n) > limit || woff > (limit - n)) 932 n = limit - woff; 933 934 /* Will this write extend the file length? */ 935 write_eof = (woff + n > zp->z_size); 936 937 end_size = MAX(zp->z_size, woff + n); 938 939 /* 940 * Write the file in reasonable size chunks. Each chunk is written 941 * in a separate transaction; this keeps the intent log records small 942 * and allows us to do more fine-grained space accounting. 943 */ 944 while (n > 0) { 945 abuf = NULL; 946 woff = uio->uio_loffset; 947 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 948 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 949 if (abuf != NULL) 950 dmu_return_arcbuf(abuf); 951 error = SET_ERROR(EDQUOT); 952 break; 953 } 954 955 if (xuio && abuf == NULL) { 956 ASSERT(i_iov < iovcnt); 957 aiov = &iovp[i_iov]; 958 abuf = dmu_xuio_arcbuf(xuio, i_iov); 959 dmu_xuio_clear(xuio, i_iov); 960 DTRACE_PROBE3(zfs_cp_write, int, i_iov, 961 iovec_t *, aiov, arc_buf_t *, abuf); 962 ASSERT((aiov->iov_base == abuf->b_data) || 963 ((char *)aiov->iov_base - (char *)abuf->b_data + 964 aiov->iov_len == arc_buf_size(abuf))); 965 i_iov++; 966 } else if (abuf == NULL && n >= max_blksz && 967 woff >= zp->z_size && 968 P2PHASE(woff, max_blksz) == 0 && 969 zp->z_blksz == max_blksz) { 970 /* 971 * This write covers a full block. "Borrow" a buffer 972 * from the dmu so that we can fill it before we enter 973 * a transaction. This avoids the possibility of 974 * holding up the transaction if the data copy hangs 975 * up on a pagefault (e.g., from an NFS server mapping). 976 */ 977 size_t cbytes; 978 979 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 980 max_blksz); 981 ASSERT(abuf != NULL); 982 ASSERT(arc_buf_size(abuf) == max_blksz); 983 if (error = uiocopy(abuf->b_data, max_blksz, 984 UIO_WRITE, uio, &cbytes)) { 985 dmu_return_arcbuf(abuf); 986 break; 987 } 988 ASSERT(cbytes == max_blksz); 989 } 990 991 /* 992 * Start a transaction. 993 */ 994 tx = dmu_tx_create(zfsvfs->z_os); 995 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 996 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz)); 997 zfs_sa_upgrade_txholds(tx, zp); 998 error = dmu_tx_assign(tx, TXG_WAIT); 999 if (error) { 1000 dmu_tx_abort(tx); 1001 if (abuf != NULL) 1002 dmu_return_arcbuf(abuf); 1003 break; 1004 } 1005 1006 /* 1007 * If zfs_range_lock() over-locked we grow the blocksize 1008 * and then reduce the lock range. This will only happen 1009 * on the first iteration since zfs_range_reduce() will 1010 * shrink down r_len to the appropriate size. 1011 */ 1012 if (rl->r_len == UINT64_MAX) { 1013 uint64_t new_blksz; 1014 1015 if (zp->z_blksz > max_blksz) { 1016 /* 1017 * File's blocksize is already larger than the 1018 * "recordsize" property. Only let it grow to 1019 * the next power of 2. 1020 */ 1021 ASSERT(!ISP2(zp->z_blksz)); 1022 new_blksz = MIN(end_size, 1023 1 << highbit64(zp->z_blksz)); 1024 } else { 1025 new_blksz = MIN(end_size, max_blksz); 1026 } 1027 zfs_grow_blocksize(zp, new_blksz, tx); 1028 zfs_range_reduce(rl, woff, n); 1029 } 1030 1031 /* 1032 * XXX - should we really limit each write to z_max_blksz? 1033 * Perhaps we should use SPA_MAXBLOCKSIZE chunks? 1034 */ 1035 nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz)); 1036 1037 if (woff + nbytes > zp->z_size) 1038 vnode_pager_setsize(vp, woff + nbytes); 1039 1040 if (abuf == NULL) { 1041 tx_bytes = uio->uio_resid; 1042 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl), 1043 uio, nbytes, tx); 1044 tx_bytes -= uio->uio_resid; 1045 } else { 1046 tx_bytes = nbytes; 1047 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len); 1048 /* 1049 * If this is not a full block write, but we are 1050 * extending the file past EOF and this data starts 1051 * block-aligned, use assign_arcbuf(). Otherwise, 1052 * write via dmu_write(). 1053 */ 1054 if (tx_bytes < max_blksz && (!write_eof || 1055 aiov->iov_base != abuf->b_data)) { 1056 ASSERT(xuio); 1057 dmu_write(zfsvfs->z_os, zp->z_id, woff, 1058 aiov->iov_len, aiov->iov_base, tx); 1059 dmu_return_arcbuf(abuf); 1060 xuio_stat_wbuf_copied(); 1061 } else { 1062 ASSERT(xuio || tx_bytes == max_blksz); 1063 dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl), 1064 woff, abuf, tx); 1065 } 1066 ASSERT(tx_bytes <= uio->uio_resid); 1067 uioskip(uio, tx_bytes); 1068 } 1069 if (tx_bytes && vn_has_cached_data(vp)) { 1070 update_pages(vp, woff, tx_bytes, zfsvfs->z_os, 1071 zp->z_id, uio->uio_segflg, tx); 1072 } 1073 1074 /* 1075 * If we made no progress, we're done. If we made even 1076 * partial progress, update the znode and ZIL accordingly. 1077 */ 1078 if (tx_bytes == 0) { 1079 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs), 1080 (void *)&zp->z_size, sizeof (uint64_t), tx); 1081 dmu_tx_commit(tx); 1082 ASSERT(error != 0); 1083 break; 1084 } 1085 1086 /* 1087 * Clear Set-UID/Set-GID bits on successful write if not 1088 * privileged and at least one of the excute bits is set. 1089 * 1090 * It would be nice to to this after all writes have 1091 * been done, but that would still expose the ISUID/ISGID 1092 * to another app after the partial write is committed. 1093 * 1094 * Note: we don't call zfs_fuid_map_id() here because 1095 * user 0 is not an ephemeral uid. 1096 */ 1097 mutex_enter(&zp->z_acl_lock); 1098 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) | 1099 (S_IXUSR >> 6))) != 0 && 1100 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 && 1101 secpolicy_vnode_setid_retain(vp, cr, 1102 (zp->z_mode & S_ISUID) != 0 && zp->z_uid == 0) != 0) { 1103 uint64_t newmode; 1104 zp->z_mode &= ~(S_ISUID | S_ISGID); 1105 newmode = zp->z_mode; 1106 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), 1107 (void *)&newmode, sizeof (uint64_t), tx); 1108 } 1109 mutex_exit(&zp->z_acl_lock); 1110 1111 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 1112 B_TRUE); 1113 1114 /* 1115 * Update the file size (zp_size) if it has changed; 1116 * account for possible concurrent updates. 1117 */ 1118 while ((end_size = zp->z_size) < uio->uio_loffset) { 1119 (void) atomic_cas_64(&zp->z_size, end_size, 1120 uio->uio_loffset); 1121 ASSERT(error == 0); 1122 } 1123 /* 1124 * If we are replaying and eof is non zero then force 1125 * the file size to the specified eof. Note, there's no 1126 * concurrency during replay. 1127 */ 1128 if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0) 1129 zp->z_size = zfsvfs->z_replay_eof; 1130 1131 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 1132 1133 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag); 1134 dmu_tx_commit(tx); 1135 1136 if (error != 0) 1137 break; 1138 ASSERT(tx_bytes == nbytes); 1139 n -= nbytes; 1140 1141#ifdef sun 1142 if (!xuio && n > 0) 1143 uio_prefaultpages(MIN(n, max_blksz), uio); 1144#endif /* sun */ 1145 } 1146 1147 zfs_range_unlock(rl); 1148 1149 /* 1150 * If we're in replay mode, or we made no progress, return error. 1151 * Otherwise, it's at least a partial write, so it's successful. 1152 */ 1153 if (zfsvfs->z_replay || uio->uio_resid == start_resid) { 1154 ZFS_EXIT(zfsvfs); 1155 return (error); 1156 } 1157 1158 if (ioflag & (FSYNC | FDSYNC) || 1159 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 1160 zil_commit(zilog, zp->z_id); 1161 1162 ZFS_EXIT(zfsvfs); 1163 return (0); 1164} 1165 1166void 1167zfs_get_done(zgd_t *zgd, int error) 1168{ 1169 znode_t *zp = zgd->zgd_private; 1170 objset_t *os = zp->z_zfsvfs->z_os; 1171 1172 if (zgd->zgd_db) 1173 dmu_buf_rele(zgd->zgd_db, zgd); 1174 1175 zfs_range_unlock(zgd->zgd_rl); 1176 1177 /* 1178 * Release the vnode asynchronously as we currently have the 1179 * txg stopped from syncing. 1180 */ 1181 VN_RELE_ASYNC(ZTOV(zp), dsl_pool_vnrele_taskq(dmu_objset_pool(os))); 1182 1183 if (error == 0 && zgd->zgd_bp) 1184 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 1185 1186 kmem_free(zgd, sizeof (zgd_t)); 1187} 1188 1189#ifdef DEBUG 1190static int zil_fault_io = 0; 1191#endif 1192 1193/* 1194 * Get data to generate a TX_WRITE intent log record. 1195 */ 1196int 1197zfs_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 1198{ 1199 zfsvfs_t *zfsvfs = arg; 1200 objset_t *os = zfsvfs->z_os; 1201 znode_t *zp; 1202 uint64_t object = lr->lr_foid; 1203 uint64_t offset = lr->lr_offset; 1204 uint64_t size = lr->lr_length; 1205 blkptr_t *bp = &lr->lr_blkptr; 1206 dmu_buf_t *db; 1207 zgd_t *zgd; 1208 int error = 0; 1209 1210 ASSERT(zio != NULL); 1211 ASSERT(size != 0); 1212 1213 /* 1214 * Nothing to do if the file has been removed 1215 */ 1216 if (zfs_zget(zfsvfs, object, &zp) != 0) 1217 return (SET_ERROR(ENOENT)); 1218 if (zp->z_unlinked) { 1219 /* 1220 * Release the vnode asynchronously as we currently have the 1221 * txg stopped from syncing. 1222 */ 1223 VN_RELE_ASYNC(ZTOV(zp), 1224 dsl_pool_vnrele_taskq(dmu_objset_pool(os))); 1225 return (SET_ERROR(ENOENT)); 1226 } 1227 1228 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1229 zgd->zgd_zilog = zfsvfs->z_log; 1230 zgd->zgd_private = zp; 1231 1232 /* 1233 * Write records come in two flavors: immediate and indirect. 1234 * For small writes it's cheaper to store the data with the 1235 * log record (immediate); for large writes it's cheaper to 1236 * sync the data and get a pointer to it (indirect) so that 1237 * we don't have to write the data twice. 1238 */ 1239 if (buf != NULL) { /* immediate write */ 1240 zgd->zgd_rl = zfs_range_lock(zp, offset, size, RL_READER); 1241 /* test for truncation needs to be done while range locked */ 1242 if (offset >= zp->z_size) { 1243 error = SET_ERROR(ENOENT); 1244 } else { 1245 error = dmu_read(os, object, offset, size, buf, 1246 DMU_READ_NO_PREFETCH); 1247 } 1248 ASSERT(error == 0 || error == ENOENT); 1249 } else { /* indirect write */ 1250 /* 1251 * Have to lock the whole block to ensure when it's 1252 * written out and it's checksum is being calculated 1253 * that no one can change the data. We need to re-check 1254 * blocksize after we get the lock in case it's changed! 1255 */ 1256 for (;;) { 1257 uint64_t blkoff; 1258 size = zp->z_blksz; 1259 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset; 1260 offset -= blkoff; 1261 zgd->zgd_rl = zfs_range_lock(zp, offset, size, 1262 RL_READER); 1263 if (zp->z_blksz == size) 1264 break; 1265 offset += blkoff; 1266 zfs_range_unlock(zgd->zgd_rl); 1267 } 1268 /* test for truncation needs to be done while range locked */ 1269 if (lr->lr_offset >= zp->z_size) 1270 error = SET_ERROR(ENOENT); 1271#ifdef DEBUG 1272 if (zil_fault_io) { 1273 error = SET_ERROR(EIO); 1274 zil_fault_io = 0; 1275 } 1276#endif 1277 if (error == 0) 1278 error = dmu_buf_hold(os, object, offset, zgd, &db, 1279 DMU_READ_NO_PREFETCH); 1280 1281 if (error == 0) { 1282 blkptr_t *obp = dmu_buf_get_blkptr(db); 1283 if (obp) { 1284 ASSERT(BP_IS_HOLE(bp)); 1285 *bp = *obp; 1286 } 1287 1288 zgd->zgd_db = db; 1289 zgd->zgd_bp = bp; 1290 1291 ASSERT(db->db_offset == offset); 1292 ASSERT(db->db_size == size); 1293 1294 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1295 zfs_get_done, zgd); 1296 ASSERT(error || lr->lr_length <= zp->z_blksz); 1297 1298 /* 1299 * On success, we need to wait for the write I/O 1300 * initiated by dmu_sync() to complete before we can 1301 * release this dbuf. We will finish everything up 1302 * in the zfs_get_done() callback. 1303 */ 1304 if (error == 0) 1305 return (0); 1306 1307 if (error == EALREADY) { 1308 lr->lr_common.lrc_txtype = TX_WRITE2; 1309 error = 0; 1310 } 1311 } 1312 } 1313 1314 zfs_get_done(zgd, error); 1315 1316 return (error); 1317} 1318 1319/*ARGSUSED*/ 1320static int 1321zfs_access(vnode_t *vp, int mode, int flag, cred_t *cr, 1322 caller_context_t *ct) 1323{ 1324 znode_t *zp = VTOZ(vp); 1325 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1326 int error; 1327 1328 ZFS_ENTER(zfsvfs); 1329 ZFS_VERIFY_ZP(zp); 1330 1331 if (flag & V_ACE_MASK) 1332 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr); 1333 else 1334 error = zfs_zaccess_rwx(zp, mode, flag, cr); 1335 1336 ZFS_EXIT(zfsvfs); 1337 return (error); 1338} 1339 1340/* 1341 * If vnode is for a device return a specfs vnode instead. 1342 */ 1343static int 1344specvp_check(vnode_t **vpp, cred_t *cr) 1345{ 1346 int error = 0; 1347 1348 if (IS_DEVVP(*vpp)) { 1349 struct vnode *svp; 1350 1351 svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); 1352 VN_RELE(*vpp); 1353 if (svp == NULL) 1354 error = SET_ERROR(ENOSYS); 1355 *vpp = svp; 1356 } 1357 return (error); 1358} 1359 1360 1361/* 1362 * Lookup an entry in a directory, or an extended attribute directory. 1363 * If it exists, return a held vnode reference for it. 1364 * 1365 * IN: dvp - vnode of directory to search. 1366 * nm - name of entry to lookup. 1367 * pnp - full pathname to lookup [UNUSED]. 1368 * flags - LOOKUP_XATTR set if looking for an attribute. 1369 * rdir - root directory vnode [UNUSED]. 1370 * cr - credentials of caller. 1371 * ct - caller context 1372 * direntflags - directory lookup flags 1373 * realpnp - returned pathname. 1374 * 1375 * OUT: vpp - vnode of located entry, NULL if not found. 1376 * 1377 * RETURN: 0 on success, error code on failure. 1378 * 1379 * Timestamps: 1380 * NA 1381 */ 1382/* ARGSUSED */ 1383static int 1384zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct componentname *cnp, 1385 int nameiop, cred_t *cr, kthread_t *td, int flags) 1386{ 1387 znode_t *zdp = VTOZ(dvp); 1388 zfsvfs_t *zfsvfs = zdp->z_zfsvfs; 1389 int error = 0; 1390 int *direntflags = NULL; 1391 void *realpnp = NULL; 1392 1393 /* fast path */ 1394 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) { 1395 1396 if (dvp->v_type != VDIR) { 1397 return (SET_ERROR(ENOTDIR)); 1398 } else if (zdp->z_sa_hdl == NULL) { 1399 return (SET_ERROR(EIO)); 1400 } 1401 1402 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) { 1403 error = zfs_fastaccesschk_execute(zdp, cr); 1404 if (!error) { 1405 *vpp = dvp; 1406 VN_HOLD(*vpp); 1407 return (0); 1408 } 1409 return (error); 1410 } else { 1411 vnode_t *tvp = dnlc_lookup(dvp, nm); 1412 1413 if (tvp) { 1414 error = zfs_fastaccesschk_execute(zdp, cr); 1415 if (error) { 1416 VN_RELE(tvp); 1417 return (error); 1418 } 1419 if (tvp == DNLC_NO_VNODE) { 1420 VN_RELE(tvp); 1421 return (SET_ERROR(ENOENT)); 1422 } else { 1423 *vpp = tvp; 1424 return (specvp_check(vpp, cr)); 1425 } 1426 } 1427 } 1428 } 1429 1430 DTRACE_PROBE2(zfs__fastpath__lookup__miss, vnode_t *, dvp, char *, nm); 1431 1432 ZFS_ENTER(zfsvfs); 1433 ZFS_VERIFY_ZP(zdp); 1434 1435 *vpp = NULL; 1436 1437 if (flags & LOOKUP_XATTR) { 1438#ifdef TODO 1439 /* 1440 * If the xattr property is off, refuse the lookup request. 1441 */ 1442 if (!(zfsvfs->z_vfs->vfs_flag & VFS_XATTR)) { 1443 ZFS_EXIT(zfsvfs); 1444 return (SET_ERROR(EINVAL)); 1445 } 1446#endif 1447 1448 /* 1449 * We don't allow recursive attributes.. 1450 * Maybe someday we will. 1451 */ 1452 if (zdp->z_pflags & ZFS_XATTR) { 1453 ZFS_EXIT(zfsvfs); 1454 return (SET_ERROR(EINVAL)); 1455 } 1456 1457 if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr, flags)) { 1458 ZFS_EXIT(zfsvfs); 1459 return (error); 1460 } 1461 1462 /* 1463 * Do we have permission to get into attribute directory? 1464 */ 1465 1466 if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, 0, 1467 B_FALSE, cr)) { 1468 VN_RELE(*vpp); 1469 *vpp = NULL; 1470 } 1471 1472 ZFS_EXIT(zfsvfs); 1473 return (error); 1474 } 1475 1476 if (dvp->v_type != VDIR) { 1477 ZFS_EXIT(zfsvfs); 1478 return (SET_ERROR(ENOTDIR)); 1479 } 1480 1481 /* 1482 * Check accessibility of directory. 1483 */ 1484 1485 if (error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr)) { 1486 ZFS_EXIT(zfsvfs); 1487 return (error); 1488 } 1489 1490 if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm), 1491 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 1492 ZFS_EXIT(zfsvfs); 1493 return (SET_ERROR(EILSEQ)); 1494 } 1495 1496 error = zfs_dirlook(zdp, nm, vpp, flags, direntflags, realpnp); 1497 if (error == 0) 1498 error = specvp_check(vpp, cr); 1499 1500 /* Translate errors and add SAVENAME when needed. */ 1501 if (cnp->cn_flags & ISLASTCN) { 1502 switch (nameiop) { 1503 case CREATE: 1504 case RENAME: 1505 if (error == ENOENT) { 1506 error = EJUSTRETURN; 1507 cnp->cn_flags |= SAVENAME; 1508 break; 1509 } 1510 /* FALLTHROUGH */ 1511 case DELETE: 1512 if (error == 0) 1513 cnp->cn_flags |= SAVENAME; 1514 break; 1515 } 1516 } 1517 if (error == 0 && (nm[0] != '.' || nm[1] != '\0')) { 1518 int ltype = 0; 1519 1520 if (cnp->cn_flags & ISDOTDOT) { 1521 ltype = VOP_ISLOCKED(dvp); 1522 VOP_UNLOCK(dvp, 0); 1523 } 1524 ZFS_EXIT(zfsvfs); 1525 error = vn_lock(*vpp, cnp->cn_lkflags); 1526 if (cnp->cn_flags & ISDOTDOT) 1527 vn_lock(dvp, ltype | LK_RETRY); 1528 if (error != 0) { 1529 VN_RELE(*vpp); 1530 *vpp = NULL; 1531 return (error); 1532 } 1533 } else { 1534 ZFS_EXIT(zfsvfs); 1535 } 1536 1537#ifdef FREEBSD_NAMECACHE 1538 /* 1539 * Insert name into cache (as non-existent) if appropriate. 1540 */ 1541 if (error == ENOENT && (cnp->cn_flags & MAKEENTRY) && nameiop != CREATE) 1542 cache_enter(dvp, *vpp, cnp); 1543 /* 1544 * Insert name into cache if appropriate. 1545 */ 1546 if (error == 0 && (cnp->cn_flags & MAKEENTRY)) { 1547 if (!(cnp->cn_flags & ISLASTCN) || 1548 (nameiop != DELETE && nameiop != RENAME)) { 1549 cache_enter(dvp, *vpp, cnp); 1550 } 1551 } 1552#endif 1553 1554 return (error); 1555} 1556 1557/* 1558 * Attempt to create a new entry in a directory. If the entry 1559 * already exists, truncate the file if permissible, else return 1560 * an error. Return the vp of the created or trunc'd file. 1561 * 1562 * IN: dvp - vnode of directory to put new file entry in. 1563 * name - name of new file entry. 1564 * vap - attributes of new file. 1565 * excl - flag indicating exclusive or non-exclusive mode. 1566 * mode - mode to open file with. 1567 * cr - credentials of caller. 1568 * flag - large file flag [UNUSED]. 1569 * ct - caller context 1570 * vsecp - ACL to be set 1571 * 1572 * OUT: vpp - vnode of created or trunc'd entry. 1573 * 1574 * RETURN: 0 on success, error code on failure. 1575 * 1576 * Timestamps: 1577 * dvp - ctime|mtime updated if new entry created 1578 * vp - ctime|mtime always, atime if new 1579 */ 1580 1581/* ARGSUSED */ 1582static int 1583zfs_create(vnode_t *dvp, char *name, vattr_t *vap, int excl, int mode, 1584 vnode_t **vpp, cred_t *cr, kthread_t *td) 1585{ 1586 znode_t *zp, *dzp = VTOZ(dvp); 1587 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1588 zilog_t *zilog; 1589 objset_t *os; 1590 zfs_dirlock_t *dl; 1591 dmu_tx_t *tx; 1592 int error; 1593 ksid_t *ksid; 1594 uid_t uid; 1595 gid_t gid = crgetgid(cr); 1596 zfs_acl_ids_t acl_ids; 1597 boolean_t fuid_dirtied; 1598 boolean_t have_acl = B_FALSE; 1599 boolean_t waited = B_FALSE; 1600 void *vsecp = NULL; 1601 int flag = 0; 1602 1603 /* 1604 * If we have an ephemeral id, ACL, or XVATTR then 1605 * make sure file system is at proper version 1606 */ 1607 1608 ksid = crgetsid(cr, KSID_OWNER); 1609 if (ksid) 1610 uid = ksid_getid(ksid); 1611 else 1612 uid = crgetuid(cr); 1613 1614 if (zfsvfs->z_use_fuids == B_FALSE && 1615 (vsecp || (vap->va_mask & AT_XVATTR) || 1616 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid))) 1617 return (SET_ERROR(EINVAL)); 1618 1619 ZFS_ENTER(zfsvfs); 1620 ZFS_VERIFY_ZP(dzp); 1621 os = zfsvfs->z_os; 1622 zilog = zfsvfs->z_log; 1623 1624 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name), 1625 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 1626 ZFS_EXIT(zfsvfs); 1627 return (SET_ERROR(EILSEQ)); 1628 } 1629 1630 if (vap->va_mask & AT_XVATTR) { 1631 if ((error = secpolicy_xvattr(dvp, (xvattr_t *)vap, 1632 crgetuid(cr), cr, vap->va_type)) != 0) { 1633 ZFS_EXIT(zfsvfs); 1634 return (error); 1635 } 1636 } 1637 1638 getnewvnode_reserve(1); 1639 1640top: 1641 *vpp = NULL; 1642 1643 if ((vap->va_mode & S_ISVTX) && secpolicy_vnode_stky_modify(cr)) 1644 vap->va_mode &= ~S_ISVTX; 1645 1646 if (*name == '\0') { 1647 /* 1648 * Null component name refers to the directory itself. 1649 */ 1650 VN_HOLD(dvp); 1651 zp = dzp; 1652 dl = NULL; 1653 error = 0; 1654 } else { 1655 /* possible VN_HOLD(zp) */ 1656 int zflg = 0; 1657 1658 if (flag & FIGNORECASE) 1659 zflg |= ZCILOOK; 1660 1661 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 1662 NULL, NULL); 1663 if (error) { 1664 if (have_acl) 1665 zfs_acl_ids_free(&acl_ids); 1666 if (strcmp(name, "..") == 0) 1667 error = SET_ERROR(EISDIR); 1668 getnewvnode_drop_reserve(); 1669 ZFS_EXIT(zfsvfs); 1670 return (error); 1671 } 1672 } 1673 1674 if (zp == NULL) { 1675 uint64_t txtype; 1676 1677 /* 1678 * Create a new file object and update the directory 1679 * to reference it. 1680 */ 1681 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 1682 if (have_acl) 1683 zfs_acl_ids_free(&acl_ids); 1684 goto out; 1685 } 1686 1687 /* 1688 * We only support the creation of regular files in 1689 * extended attribute directories. 1690 */ 1691 1692 if ((dzp->z_pflags & ZFS_XATTR) && 1693 (vap->va_type != VREG)) { 1694 if (have_acl) 1695 zfs_acl_ids_free(&acl_ids); 1696 error = SET_ERROR(EINVAL); 1697 goto out; 1698 } 1699 1700 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap, 1701 cr, vsecp, &acl_ids)) != 0) 1702 goto out; 1703 have_acl = B_TRUE; 1704 1705 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 1706 zfs_acl_ids_free(&acl_ids); 1707 error = SET_ERROR(EDQUOT); 1708 goto out; 1709 } 1710 1711 tx = dmu_tx_create(os); 1712 1713 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 1714 ZFS_SA_BASE_ATTR_SIZE); 1715 1716 fuid_dirtied = zfsvfs->z_fuid_dirty; 1717 if (fuid_dirtied) 1718 zfs_fuid_txhold(zfsvfs, tx); 1719 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 1720 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); 1721 if (!zfsvfs->z_use_sa && 1722 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1723 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 1724 0, acl_ids.z_aclp->z_acl_bytes); 1725 } 1726 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 1727 if (error) { 1728 zfs_dirent_unlock(dl); 1729 if (error == ERESTART) { 1730 waited = B_TRUE; 1731 dmu_tx_wait(tx); 1732 dmu_tx_abort(tx); 1733 goto top; 1734 } 1735 zfs_acl_ids_free(&acl_ids); 1736 dmu_tx_abort(tx); 1737 getnewvnode_drop_reserve(); 1738 ZFS_EXIT(zfsvfs); 1739 return (error); 1740 } 1741 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 1742 1743 if (fuid_dirtied) 1744 zfs_fuid_sync(zfsvfs, tx); 1745 1746 (void) zfs_link_create(dl, zp, tx, ZNEW); 1747 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap); 1748 if (flag & FIGNORECASE) 1749 txtype |= TX_CI; 1750 zfs_log_create(zilog, tx, txtype, dzp, zp, name, 1751 vsecp, acl_ids.z_fuidp, vap); 1752 zfs_acl_ids_free(&acl_ids); 1753 dmu_tx_commit(tx); 1754 } else { 1755 int aflags = (flag & FAPPEND) ? V_APPEND : 0; 1756 1757 if (have_acl) 1758 zfs_acl_ids_free(&acl_ids); 1759 have_acl = B_FALSE; 1760 1761 /* 1762 * A directory entry already exists for this name. 1763 */ 1764 /* 1765 * Can't truncate an existing file if in exclusive mode. 1766 */ 1767 if (excl == EXCL) { 1768 error = SET_ERROR(EEXIST); 1769 goto out; 1770 } 1771 /* 1772 * Can't open a directory for writing. 1773 */ 1774 if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) { 1775 error = SET_ERROR(EISDIR); 1776 goto out; 1777 } 1778 /* 1779 * Verify requested access to file. 1780 */ 1781 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) { 1782 goto out; 1783 } 1784 1785 mutex_enter(&dzp->z_lock); 1786 dzp->z_seq++; 1787 mutex_exit(&dzp->z_lock); 1788 1789 /* 1790 * Truncate regular files if requested. 1791 */ 1792 if ((ZTOV(zp)->v_type == VREG) && 1793 (vap->va_mask & AT_SIZE) && (vap->va_size == 0)) { 1794 /* we can't hold any locks when calling zfs_freesp() */ 1795 zfs_dirent_unlock(dl); 1796 dl = NULL; 1797 error = zfs_freesp(zp, 0, 0, mode, TRUE); 1798 if (error == 0) { 1799 vnevent_create(ZTOV(zp), ct); 1800 } 1801 } 1802 } 1803out: 1804 getnewvnode_drop_reserve(); 1805 if (dl) 1806 zfs_dirent_unlock(dl); 1807 1808 if (error) { 1809 if (zp) 1810 VN_RELE(ZTOV(zp)); 1811 } else { 1812 *vpp = ZTOV(zp); 1813 error = specvp_check(vpp, cr); 1814 } 1815 1816 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 1817 zil_commit(zilog, 0); 1818 1819 ZFS_EXIT(zfsvfs); 1820 return (error); 1821} 1822 1823/* 1824 * Remove an entry from a directory. 1825 * 1826 * IN: dvp - vnode of directory to remove entry from. 1827 * name - name of entry to remove. 1828 * cr - credentials of caller. 1829 * ct - caller context 1830 * flags - case flags 1831 * 1832 * RETURN: 0 on success, error code on failure. 1833 * 1834 * Timestamps: 1835 * dvp - ctime|mtime 1836 * vp - ctime (if nlink > 0) 1837 */ 1838 1839uint64_t null_xattr = 0; 1840 1841/*ARGSUSED*/ 1842static int 1843zfs_remove(vnode_t *dvp, char *name, cred_t *cr, caller_context_t *ct, 1844 int flags) 1845{ 1846 znode_t *zp, *dzp = VTOZ(dvp); 1847 znode_t *xzp; 1848 vnode_t *vp; 1849 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1850 zilog_t *zilog; 1851 uint64_t acl_obj, xattr_obj; 1852 uint64_t xattr_obj_unlinked = 0; 1853 uint64_t obj = 0; 1854 zfs_dirlock_t *dl; 1855 dmu_tx_t *tx; 1856 boolean_t may_delete_now, delete_now = FALSE; 1857 boolean_t unlinked, toobig = FALSE; 1858 uint64_t txtype; 1859 pathname_t *realnmp = NULL; 1860 pathname_t realnm; 1861 int error; 1862 int zflg = ZEXISTS; 1863 boolean_t waited = B_FALSE; 1864 1865 ZFS_ENTER(zfsvfs); 1866 ZFS_VERIFY_ZP(dzp); 1867 zilog = zfsvfs->z_log; 1868 1869 if (flags & FIGNORECASE) { 1870 zflg |= ZCILOOK; 1871 pn_alloc(&realnm); 1872 realnmp = &realnm; 1873 } 1874 1875top: 1876 xattr_obj = 0; 1877 xzp = NULL; 1878 /* 1879 * Attempt to lock directory; fail if entry doesn't exist. 1880 */ 1881 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 1882 NULL, realnmp)) { 1883 if (realnmp) 1884 pn_free(realnmp); 1885 ZFS_EXIT(zfsvfs); 1886 return (error); 1887 } 1888 1889 vp = ZTOV(zp); 1890 1891 if (error = zfs_zaccess_delete(dzp, zp, cr)) { 1892 goto out; 1893 } 1894 1895 /* 1896 * Need to use rmdir for removing directories. 1897 */ 1898 if (vp->v_type == VDIR) { 1899 error = SET_ERROR(EPERM); 1900 goto out; 1901 } 1902 1903 vnevent_remove(vp, dvp, name, ct); 1904 1905 if (realnmp) 1906 dnlc_remove(dvp, realnmp->pn_buf); 1907 else 1908 dnlc_remove(dvp, name); 1909 1910 VI_LOCK(vp); 1911 may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp); 1912 VI_UNLOCK(vp); 1913 1914 /* 1915 * We may delete the znode now, or we may put it in the unlinked set; 1916 * it depends on whether we're the last link, and on whether there are 1917 * other holds on the vnode. So we dmu_tx_hold() the right things to 1918 * allow for either case. 1919 */ 1920 obj = zp->z_id; 1921 tx = dmu_tx_create(zfsvfs->z_os); 1922 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name); 1923 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1924 zfs_sa_upgrade_txholds(tx, zp); 1925 zfs_sa_upgrade_txholds(tx, dzp); 1926 if (may_delete_now) { 1927 toobig = 1928 zp->z_size > zp->z_blksz * DMU_MAX_DELETEBLKCNT; 1929 /* if the file is too big, only hold_free a token amount */ 1930 dmu_tx_hold_free(tx, zp->z_id, 0, 1931 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END)); 1932 } 1933 1934 /* are there any extended attributes? */ 1935 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 1936 &xattr_obj, sizeof (xattr_obj)); 1937 if (error == 0 && xattr_obj) { 1938 error = zfs_zget(zfsvfs, xattr_obj, &xzp); 1939 ASSERT0(error); 1940 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 1941 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); 1942 } 1943 1944 mutex_enter(&zp->z_lock); 1945 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now) 1946 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); 1947 mutex_exit(&zp->z_lock); 1948 1949 /* charge as an update -- would be nice not to charge at all */ 1950 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 1951 1952 /* 1953 * Mark this transaction as typically resulting in a net free of 1954 * space, unless object removal will be delayed indefinitely 1955 * (due to active holds on the vnode due to the file being open). 1956 */ 1957 if (may_delete_now) 1958 dmu_tx_mark_netfree(tx); 1959 1960 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 1961 if (error) { 1962 zfs_dirent_unlock(dl); 1963 VN_RELE(vp); 1964 if (xzp) 1965 VN_RELE(ZTOV(xzp)); 1966 if (error == ERESTART) { 1967 waited = B_TRUE; 1968 dmu_tx_wait(tx); 1969 dmu_tx_abort(tx); 1970 goto top; 1971 } 1972 if (realnmp) 1973 pn_free(realnmp); 1974 dmu_tx_abort(tx); 1975 ZFS_EXIT(zfsvfs); 1976 return (error); 1977 } 1978 1979 /* 1980 * Remove the directory entry. 1981 */ 1982 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked); 1983 1984 if (error) { 1985 dmu_tx_commit(tx); 1986 goto out; 1987 } 1988 1989 if (unlinked) { 1990 /* 1991 * Hold z_lock so that we can make sure that the ACL obj 1992 * hasn't changed. Could have been deleted due to 1993 * zfs_sa_upgrade(). 1994 */ 1995 mutex_enter(&zp->z_lock); 1996 VI_LOCK(vp); 1997 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 1998 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked)); 1999 delete_now = may_delete_now && !toobig && 2000 vp->v_count == 1 && !vn_has_cached_data(vp) && 2001 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) == 2002 acl_obj; 2003 VI_UNLOCK(vp); 2004 } 2005 2006 if (delete_now) { 2007#ifdef __FreeBSD__ 2008 panic("zfs_remove: delete_now branch taken"); 2009#endif 2010 if (xattr_obj_unlinked) { 2011 ASSERT3U(xzp->z_links, ==, 2); 2012 mutex_enter(&xzp->z_lock); 2013 xzp->z_unlinked = 1; 2014 xzp->z_links = 0; 2015 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs), 2016 &xzp->z_links, sizeof (xzp->z_links), tx); 2017 ASSERT3U(error, ==, 0); 2018 mutex_exit(&xzp->z_lock); 2019 zfs_unlinked_add(xzp, tx); 2020 2021 if (zp->z_is_sa) 2022 error = sa_remove(zp->z_sa_hdl, 2023 SA_ZPL_XATTR(zfsvfs), tx); 2024 else 2025 error = sa_update(zp->z_sa_hdl, 2026 SA_ZPL_XATTR(zfsvfs), &null_xattr, 2027 sizeof (uint64_t), tx); 2028 ASSERT0(error); 2029 } 2030 VI_LOCK(vp); 2031 vp->v_count--; 2032 ASSERT0(vp->v_count); 2033 VI_UNLOCK(vp); 2034 mutex_exit(&zp->z_lock); 2035 zfs_znode_delete(zp, tx); 2036 } else if (unlinked) { 2037 mutex_exit(&zp->z_lock); 2038 zfs_unlinked_add(zp, tx); 2039#ifdef __FreeBSD__ 2040 vp->v_vflag |= VV_NOSYNC; 2041#endif 2042 } 2043 2044 txtype = TX_REMOVE; 2045 if (flags & FIGNORECASE) 2046 txtype |= TX_CI; 2047 zfs_log_remove(zilog, tx, txtype, dzp, name, obj); 2048 2049 dmu_tx_commit(tx); 2050out: 2051 if (realnmp) 2052 pn_free(realnmp); 2053 2054 zfs_dirent_unlock(dl); 2055 2056 if (!delete_now) 2057 VN_RELE(vp); 2058 if (xzp) 2059 VN_RELE(ZTOV(xzp)); 2060 2061 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2062 zil_commit(zilog, 0); 2063 2064 ZFS_EXIT(zfsvfs); 2065 return (error); 2066} 2067 2068/* 2069 * Create a new directory and insert it into dvp using the name 2070 * provided. Return a pointer to the inserted directory. 2071 * 2072 * IN: dvp - vnode of directory to add subdir to. 2073 * dirname - name of new directory. 2074 * vap - attributes of new directory. 2075 * cr - credentials of caller. 2076 * ct - caller context 2077 * flags - case flags 2078 * vsecp - ACL to be set 2079 * 2080 * OUT: vpp - vnode of created directory. 2081 * 2082 * RETURN: 0 on success, error code on failure. 2083 * 2084 * Timestamps: 2085 * dvp - ctime|mtime updated 2086 * vp - ctime|mtime|atime updated 2087 */ 2088/*ARGSUSED*/ 2089static int 2090zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr, 2091 caller_context_t *ct, int flags, vsecattr_t *vsecp) 2092{ 2093 znode_t *zp, *dzp = VTOZ(dvp); 2094 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 2095 zilog_t *zilog; 2096 zfs_dirlock_t *dl; 2097 uint64_t txtype; 2098 dmu_tx_t *tx; 2099 int error; 2100 int zf = ZNEW; 2101 ksid_t *ksid; 2102 uid_t uid; 2103 gid_t gid = crgetgid(cr); 2104 zfs_acl_ids_t acl_ids; 2105 boolean_t fuid_dirtied; 2106 boolean_t waited = B_FALSE; 2107 2108 ASSERT(vap->va_type == VDIR); 2109 2110 /* 2111 * If we have an ephemeral id, ACL, or XVATTR then 2112 * make sure file system is at proper version 2113 */ 2114 2115 ksid = crgetsid(cr, KSID_OWNER); 2116 if (ksid) 2117 uid = ksid_getid(ksid); 2118 else 2119 uid = crgetuid(cr); 2120 if (zfsvfs->z_use_fuids == B_FALSE && 2121 (vsecp || (vap->va_mask & AT_XVATTR) || 2122 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid))) 2123 return (SET_ERROR(EINVAL)); 2124 2125 ZFS_ENTER(zfsvfs); 2126 ZFS_VERIFY_ZP(dzp); 2127 zilog = zfsvfs->z_log; 2128 2129 if (dzp->z_pflags & ZFS_XATTR) { 2130 ZFS_EXIT(zfsvfs); 2131 return (SET_ERROR(EINVAL)); 2132 } 2133 2134 if (zfsvfs->z_utf8 && u8_validate(dirname, 2135 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 2136 ZFS_EXIT(zfsvfs); 2137 return (SET_ERROR(EILSEQ)); 2138 } 2139 if (flags & FIGNORECASE) 2140 zf |= ZCILOOK; 2141 2142 if (vap->va_mask & AT_XVATTR) { 2143 if ((error = secpolicy_xvattr(dvp, (xvattr_t *)vap, 2144 crgetuid(cr), cr, vap->va_type)) != 0) { 2145 ZFS_EXIT(zfsvfs); 2146 return (error); 2147 } 2148 } 2149 2150 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr, 2151 vsecp, &acl_ids)) != 0) { 2152 ZFS_EXIT(zfsvfs); 2153 return (error); 2154 } 2155 2156 getnewvnode_reserve(1); 2157 2158 /* 2159 * First make sure the new directory doesn't exist. 2160 * 2161 * Existence is checked first to make sure we don't return 2162 * EACCES instead of EEXIST which can cause some applications 2163 * to fail. 2164 */ 2165top: 2166 *vpp = NULL; 2167 2168 if (error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf, 2169 NULL, NULL)) { 2170 zfs_acl_ids_free(&acl_ids); 2171 getnewvnode_drop_reserve(); 2172 ZFS_EXIT(zfsvfs); 2173 return (error); 2174 } 2175 2176 if (error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr)) { 2177 zfs_acl_ids_free(&acl_ids); 2178 zfs_dirent_unlock(dl); 2179 getnewvnode_drop_reserve(); 2180 ZFS_EXIT(zfsvfs); 2181 return (error); 2182 } 2183 2184 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 2185 zfs_acl_ids_free(&acl_ids); 2186 zfs_dirent_unlock(dl); 2187 getnewvnode_drop_reserve(); 2188 ZFS_EXIT(zfsvfs); 2189 return (SET_ERROR(EDQUOT)); 2190 } 2191 2192 /* 2193 * Add a new entry to the directory. 2194 */ 2195 tx = dmu_tx_create(zfsvfs->z_os); 2196 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname); 2197 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 2198 fuid_dirtied = zfsvfs->z_fuid_dirty; 2199 if (fuid_dirtied) 2200 zfs_fuid_txhold(zfsvfs, tx); 2201 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 2202 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 2203 acl_ids.z_aclp->z_acl_bytes); 2204 } 2205 2206 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 2207 ZFS_SA_BASE_ATTR_SIZE); 2208 2209 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 2210 if (error) { 2211 zfs_dirent_unlock(dl); 2212 if (error == ERESTART) { 2213 waited = B_TRUE; 2214 dmu_tx_wait(tx); 2215 dmu_tx_abort(tx); 2216 goto top; 2217 } 2218 zfs_acl_ids_free(&acl_ids); 2219 dmu_tx_abort(tx); 2220 getnewvnode_drop_reserve(); 2221 ZFS_EXIT(zfsvfs); 2222 return (error); 2223 } 2224 2225 /* 2226 * Create new node. 2227 */ 2228 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 2229 2230 if (fuid_dirtied) 2231 zfs_fuid_sync(zfsvfs, tx); 2232 2233 /* 2234 * Now put new name in parent dir. 2235 */ 2236 (void) zfs_link_create(dl, zp, tx, ZNEW); 2237 2238 *vpp = ZTOV(zp); 2239 2240 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap); 2241 if (flags & FIGNORECASE) 2242 txtype |= TX_CI; 2243 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp, 2244 acl_ids.z_fuidp, vap); 2245 2246 zfs_acl_ids_free(&acl_ids); 2247 2248 dmu_tx_commit(tx); 2249 2250 getnewvnode_drop_reserve(); 2251 2252 zfs_dirent_unlock(dl); 2253 2254 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2255 zil_commit(zilog, 0); 2256 2257 ZFS_EXIT(zfsvfs); 2258 return (0); 2259} 2260 2261/* 2262 * Remove a directory subdir entry. If the current working 2263 * directory is the same as the subdir to be removed, the 2264 * remove will fail. 2265 * 2266 * IN: dvp - vnode of directory to remove from. 2267 * name - name of directory to be removed. 2268 * cwd - vnode of current working directory. 2269 * cr - credentials of caller. 2270 * ct - caller context 2271 * flags - case flags 2272 * 2273 * RETURN: 0 on success, error code on failure. 2274 * 2275 * Timestamps: 2276 * dvp - ctime|mtime updated 2277 */ 2278/*ARGSUSED*/ 2279static int 2280zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr, 2281 caller_context_t *ct, int flags) 2282{ 2283 znode_t *dzp = VTOZ(dvp); 2284 znode_t *zp; 2285 vnode_t *vp; 2286 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 2287 zilog_t *zilog; 2288 zfs_dirlock_t *dl; 2289 dmu_tx_t *tx; 2290 int error; 2291 int zflg = ZEXISTS; 2292 boolean_t waited = B_FALSE; 2293 2294 ZFS_ENTER(zfsvfs); 2295 ZFS_VERIFY_ZP(dzp); 2296 zilog = zfsvfs->z_log; 2297 2298 if (flags & FIGNORECASE) 2299 zflg |= ZCILOOK; 2300top: 2301 zp = NULL; 2302 2303 /* 2304 * Attempt to lock directory; fail if entry doesn't exist. 2305 */ 2306 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 2307 NULL, NULL)) { 2308 ZFS_EXIT(zfsvfs); 2309 return (error); 2310 } 2311 2312 vp = ZTOV(zp); 2313 2314 if (error = zfs_zaccess_delete(dzp, zp, cr)) { 2315 goto out; 2316 } 2317 2318 if (vp->v_type != VDIR) { 2319 error = SET_ERROR(ENOTDIR); 2320 goto out; 2321 } 2322 2323 if (vp == cwd) { 2324 error = SET_ERROR(EINVAL); 2325 goto out; 2326 } 2327 2328 vnevent_rmdir(vp, dvp, name, ct); 2329 2330 /* 2331 * Grab a lock on the directory to make sure that noone is 2332 * trying to add (or lookup) entries while we are removing it. 2333 */ 2334 rw_enter(&zp->z_name_lock, RW_WRITER); 2335 2336 /* 2337 * Grab a lock on the parent pointer to make sure we play well 2338 * with the treewalk and directory rename code. 2339 */ 2340 rw_enter(&zp->z_parent_lock, RW_WRITER); 2341 2342 tx = dmu_tx_create(zfsvfs->z_os); 2343 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name); 2344 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 2345 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 2346 zfs_sa_upgrade_txholds(tx, zp); 2347 zfs_sa_upgrade_txholds(tx, dzp); 2348 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 2349 if (error) { 2350 rw_exit(&zp->z_parent_lock); 2351 rw_exit(&zp->z_name_lock); 2352 zfs_dirent_unlock(dl); 2353 VN_RELE(vp); 2354 if (error == ERESTART) { 2355 waited = B_TRUE; 2356 dmu_tx_wait(tx); 2357 dmu_tx_abort(tx); 2358 goto top; 2359 } 2360 dmu_tx_abort(tx); 2361 ZFS_EXIT(zfsvfs); 2362 return (error); 2363 } 2364 2365#ifdef FREEBSD_NAMECACHE 2366 cache_purge(dvp); 2367#endif 2368 2369 error = zfs_link_destroy(dl, zp, tx, zflg, NULL); 2370 2371 if (error == 0) { 2372 uint64_t txtype = TX_RMDIR; 2373 if (flags & FIGNORECASE) 2374 txtype |= TX_CI; 2375 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT); 2376 } 2377 2378 dmu_tx_commit(tx); 2379 2380 rw_exit(&zp->z_parent_lock); 2381 rw_exit(&zp->z_name_lock); 2382#ifdef FREEBSD_NAMECACHE 2383 cache_purge(vp); 2384#endif 2385out: 2386 zfs_dirent_unlock(dl); 2387 2388 VN_RELE(vp); 2389 2390 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2391 zil_commit(zilog, 0); 2392 2393 ZFS_EXIT(zfsvfs); 2394 return (error); 2395} 2396 2397/* 2398 * Read as many directory entries as will fit into the provided 2399 * buffer from the given directory cursor position (specified in 2400 * the uio structure). 2401 * 2402 * IN: vp - vnode of directory to read. 2403 * uio - structure supplying read location, range info, 2404 * and return buffer. 2405 * cr - credentials of caller. 2406 * ct - caller context 2407 * flags - case flags 2408 * 2409 * OUT: uio - updated offset and range, buffer filled. 2410 * eofp - set to true if end-of-file detected. 2411 * 2412 * RETURN: 0 on success, error code on failure. 2413 * 2414 * Timestamps: 2415 * vp - atime updated 2416 * 2417 * Note that the low 4 bits of the cookie returned by zap is always zero. 2418 * This allows us to use the low range for "special" directory entries: 2419 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem, 2420 * we use the offset 2 for the '.zfs' directory. 2421 */ 2422/* ARGSUSED */ 2423static int 2424zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp, int *ncookies, u_long **cookies) 2425{ 2426 znode_t *zp = VTOZ(vp); 2427 iovec_t *iovp; 2428 edirent_t *eodp; 2429 dirent64_t *odp; 2430 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2431 objset_t *os; 2432 caddr_t outbuf; 2433 size_t bufsize; 2434 zap_cursor_t zc; 2435 zap_attribute_t zap; 2436 uint_t bytes_wanted; 2437 uint64_t offset; /* must be unsigned; checks for < 1 */ 2438 uint64_t parent; 2439 int local_eof; 2440 int outcount; 2441 int error; 2442 uint8_t prefetch; 2443 boolean_t check_sysattrs; 2444 uint8_t type; 2445 int ncooks; 2446 u_long *cooks = NULL; 2447 int flags = 0; 2448 2449 ZFS_ENTER(zfsvfs); 2450 ZFS_VERIFY_ZP(zp); 2451 2452 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), 2453 &parent, sizeof (parent))) != 0) { 2454 ZFS_EXIT(zfsvfs); 2455 return (error); 2456 } 2457 2458 /* 2459 * If we are not given an eof variable, 2460 * use a local one. 2461 */ 2462 if (eofp == NULL) 2463 eofp = &local_eof; 2464 2465 /* 2466 * Check for valid iov_len. 2467 */ 2468 if (uio->uio_iov->iov_len <= 0) { 2469 ZFS_EXIT(zfsvfs); 2470 return (SET_ERROR(EINVAL)); 2471 } 2472 2473 /* 2474 * Quit if directory has been removed (posix) 2475 */ 2476 if ((*eofp = zp->z_unlinked) != 0) { 2477 ZFS_EXIT(zfsvfs); 2478 return (0); 2479 } 2480 2481 error = 0; 2482 os = zfsvfs->z_os; 2483 offset = uio->uio_loffset; 2484 prefetch = zp->z_zn_prefetch; 2485 2486 /* 2487 * Initialize the iterator cursor. 2488 */ 2489 if (offset <= 3) { 2490 /* 2491 * Start iteration from the beginning of the directory. 2492 */ 2493 zap_cursor_init(&zc, os, zp->z_id); 2494 } else { 2495 /* 2496 * The offset is a serialized cursor. 2497 */ 2498 zap_cursor_init_serialized(&zc, os, zp->z_id, offset); 2499 } 2500 2501 /* 2502 * Get space to change directory entries into fs independent format. 2503 */ 2504 iovp = uio->uio_iov; 2505 bytes_wanted = iovp->iov_len; 2506 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) { 2507 bufsize = bytes_wanted; 2508 outbuf = kmem_alloc(bufsize, KM_SLEEP); 2509 odp = (struct dirent64 *)outbuf; 2510 } else { 2511 bufsize = bytes_wanted; 2512 outbuf = NULL; 2513 odp = (struct dirent64 *)iovp->iov_base; 2514 } 2515 eodp = (struct edirent *)odp; 2516 2517 if (ncookies != NULL) { 2518 /* 2519 * Minimum entry size is dirent size and 1 byte for a file name. 2520 */ 2521 ncooks = uio->uio_resid / (sizeof(struct dirent) - sizeof(((struct dirent *)NULL)->d_name) + 1); 2522 cooks = malloc(ncooks * sizeof(u_long), M_TEMP, M_WAITOK); 2523 *cookies = cooks; 2524 *ncookies = ncooks; 2525 } 2526 /* 2527 * If this VFS supports the system attribute view interface; and 2528 * we're looking at an extended attribute directory; and we care 2529 * about normalization conflicts on this vfs; then we must check 2530 * for normalization conflicts with the sysattr name space. 2531 */ 2532#ifdef TODO 2533 check_sysattrs = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) && 2534 (vp->v_flag & V_XATTRDIR) && zfsvfs->z_norm && 2535 (flags & V_RDDIR_ENTFLAGS); 2536#else 2537 check_sysattrs = 0; 2538#endif 2539 2540 /* 2541 * Transform to file-system independent format 2542 */ 2543 outcount = 0; 2544 while (outcount < bytes_wanted) { 2545 ino64_t objnum; 2546 ushort_t reclen; 2547 off64_t *next = NULL; 2548 2549 /* 2550 * Special case `.', `..', and `.zfs'. 2551 */ 2552 if (offset == 0) { 2553 (void) strcpy(zap.za_name, "."); 2554 zap.za_normalization_conflict = 0; 2555 objnum = zp->z_id; 2556 type = DT_DIR; 2557 } else if (offset == 1) { 2558 (void) strcpy(zap.za_name, ".."); 2559 zap.za_normalization_conflict = 0; 2560 objnum = parent; 2561 type = DT_DIR; 2562 } else if (offset == 2 && zfs_show_ctldir(zp)) { 2563 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME); 2564 zap.za_normalization_conflict = 0; 2565 objnum = ZFSCTL_INO_ROOT; 2566 type = DT_DIR; 2567 } else { 2568 /* 2569 * Grab next entry. 2570 */ 2571 if (error = zap_cursor_retrieve(&zc, &zap)) { 2572 if ((*eofp = (error == ENOENT)) != 0) 2573 break; 2574 else 2575 goto update; 2576 } 2577 2578 if (zap.za_integer_length != 8 || 2579 zap.za_num_integers != 1) { 2580 cmn_err(CE_WARN, "zap_readdir: bad directory " 2581 "entry, obj = %lld, offset = %lld\n", 2582 (u_longlong_t)zp->z_id, 2583 (u_longlong_t)offset); 2584 error = SET_ERROR(ENXIO); 2585 goto update; 2586 } 2587 2588 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer); 2589 /* 2590 * MacOS X can extract the object type here such as: 2591 * uint8_t type = ZFS_DIRENT_TYPE(zap.za_first_integer); 2592 */ 2593 type = ZFS_DIRENT_TYPE(zap.za_first_integer); 2594 2595 if (check_sysattrs && !zap.za_normalization_conflict) { 2596#ifdef TODO 2597 zap.za_normalization_conflict = 2598 xattr_sysattr_casechk(zap.za_name); 2599#else 2600 panic("%s:%u: TODO", __func__, __LINE__); 2601#endif 2602 } 2603 } 2604 2605 if (flags & V_RDDIR_ACCFILTER) { 2606 /* 2607 * If we have no access at all, don't include 2608 * this entry in the returned information 2609 */ 2610 znode_t *ezp; 2611 if (zfs_zget(zp->z_zfsvfs, objnum, &ezp) != 0) 2612 goto skip_entry; 2613 if (!zfs_has_access(ezp, cr)) { 2614 VN_RELE(ZTOV(ezp)); 2615 goto skip_entry; 2616 } 2617 VN_RELE(ZTOV(ezp)); 2618 } 2619 2620 if (flags & V_RDDIR_ENTFLAGS) 2621 reclen = EDIRENT_RECLEN(strlen(zap.za_name)); 2622 else 2623 reclen = DIRENT64_RECLEN(strlen(zap.za_name)); 2624 2625 /* 2626 * Will this entry fit in the buffer? 2627 */ 2628 if (outcount + reclen > bufsize) { 2629 /* 2630 * Did we manage to fit anything in the buffer? 2631 */ 2632 if (!outcount) { 2633 error = SET_ERROR(EINVAL); 2634 goto update; 2635 } 2636 break; 2637 } 2638 if (flags & V_RDDIR_ENTFLAGS) { 2639 /* 2640 * Add extended flag entry: 2641 */ 2642 eodp->ed_ino = objnum; 2643 eodp->ed_reclen = reclen; 2644 /* NOTE: ed_off is the offset for the *next* entry */ 2645 next = &(eodp->ed_off); 2646 eodp->ed_eflags = zap.za_normalization_conflict ? 2647 ED_CASE_CONFLICT : 0; 2648 (void) strncpy(eodp->ed_name, zap.za_name, 2649 EDIRENT_NAMELEN(reclen)); 2650 eodp = (edirent_t *)((intptr_t)eodp + reclen); 2651 } else { 2652 /* 2653 * Add normal entry: 2654 */ 2655 odp->d_ino = objnum; 2656 odp->d_reclen = reclen; 2657 odp->d_namlen = strlen(zap.za_name); 2658 (void) strlcpy(odp->d_name, zap.za_name, odp->d_namlen + 1); 2659 odp->d_type = type; 2660 odp = (dirent64_t *)((intptr_t)odp + reclen); 2661 } 2662 outcount += reclen; 2663 2664 ASSERT(outcount <= bufsize); 2665 2666 /* Prefetch znode */ 2667 if (prefetch) 2668 dmu_prefetch(os, objnum, 0, 0); 2669 2670 skip_entry: 2671 /* 2672 * Move to the next entry, fill in the previous offset. 2673 */ 2674 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) { 2675 zap_cursor_advance(&zc); 2676 offset = zap_cursor_serialize(&zc); 2677 } else { 2678 offset += 1; 2679 } 2680 2681 if (cooks != NULL) { 2682 *cooks++ = offset; 2683 ncooks--; 2684 KASSERT(ncooks >= 0, ("ncookies=%d", ncooks)); 2685 } 2686 } 2687 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */ 2688 2689 /* Subtract unused cookies */ 2690 if (ncookies != NULL) 2691 *ncookies -= ncooks; 2692 2693 if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) { 2694 iovp->iov_base += outcount; 2695 iovp->iov_len -= outcount; 2696 uio->uio_resid -= outcount; 2697 } else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) { 2698 /* 2699 * Reset the pointer. 2700 */ 2701 offset = uio->uio_loffset; 2702 } 2703 2704update: 2705 zap_cursor_fini(&zc); 2706 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 2707 kmem_free(outbuf, bufsize); 2708 2709 if (error == ENOENT) 2710 error = 0; 2711 2712 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 2713 2714 uio->uio_loffset = offset; 2715 ZFS_EXIT(zfsvfs); 2716 if (error != 0 && cookies != NULL) { 2717 free(*cookies, M_TEMP); 2718 *cookies = NULL; 2719 *ncookies = 0; 2720 } 2721 return (error); 2722} 2723 2724ulong_t zfs_fsync_sync_cnt = 4; 2725 2726static int 2727zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct) 2728{ 2729 znode_t *zp = VTOZ(vp); 2730 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2731 2732 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt); 2733 2734 if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) { 2735 ZFS_ENTER(zfsvfs); 2736 ZFS_VERIFY_ZP(zp); 2737 zil_commit(zfsvfs->z_log, zp->z_id); 2738 ZFS_EXIT(zfsvfs); 2739 } 2740 return (0); 2741} 2742 2743 2744/* 2745 * Get the requested file attributes and place them in the provided 2746 * vattr structure. 2747 * 2748 * IN: vp - vnode of file. 2749 * vap - va_mask identifies requested attributes. 2750 * If AT_XVATTR set, then optional attrs are requested 2751 * flags - ATTR_NOACLCHECK (CIFS server context) 2752 * cr - credentials of caller. 2753 * ct - caller context 2754 * 2755 * OUT: vap - attribute values. 2756 * 2757 * RETURN: 0 (always succeeds). 2758 */ 2759/* ARGSUSED */ 2760static int 2761zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 2762 caller_context_t *ct) 2763{ 2764 znode_t *zp = VTOZ(vp); 2765 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2766 int error = 0; 2767 uint32_t blksize; 2768 u_longlong_t nblocks; 2769 uint64_t links; 2770 uint64_t mtime[2], ctime[2], crtime[2], rdev; 2771 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */ 2772 xoptattr_t *xoap = NULL; 2773 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 2774 sa_bulk_attr_t bulk[4]; 2775 int count = 0; 2776 2777 ZFS_ENTER(zfsvfs); 2778 ZFS_VERIFY_ZP(zp); 2779 2780 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid); 2781 2782 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); 2783 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); 2784 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &crtime, 16); 2785 if (vp->v_type == VBLK || vp->v_type == VCHR) 2786 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_RDEV(zfsvfs), NULL, 2787 &rdev, 8); 2788 2789 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) { 2790 ZFS_EXIT(zfsvfs); 2791 return (error); 2792 } 2793 2794 /* 2795 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES. 2796 * Also, if we are the owner don't bother, since owner should 2797 * always be allowed to read basic attributes of file. 2798 */ 2799 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) && 2800 (vap->va_uid != crgetuid(cr))) { 2801 if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0, 2802 skipaclchk, cr)) { 2803 ZFS_EXIT(zfsvfs); 2804 return (error); 2805 } 2806 } 2807 2808 /* 2809 * Return all attributes. It's cheaper to provide the answer 2810 * than to determine whether we were asked the question. 2811 */ 2812 2813 mutex_enter(&zp->z_lock); 2814 vap->va_type = IFTOVT(zp->z_mode); 2815 vap->va_mode = zp->z_mode & ~S_IFMT; 2816#ifdef sun 2817 vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev; 2818#else 2819 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 2820#endif 2821 vap->va_nodeid = zp->z_id; 2822 if ((vp->v_flag & VROOT) && zfs_show_ctldir(zp)) 2823 links = zp->z_links + 1; 2824 else 2825 links = zp->z_links; 2826 vap->va_nlink = MIN(links, LINK_MAX); /* nlink_t limit! */ 2827 vap->va_size = zp->z_size; 2828#ifdef sun 2829 vap->va_rdev = vp->v_rdev; 2830#else 2831 if (vp->v_type == VBLK || vp->v_type == VCHR) 2832 vap->va_rdev = zfs_cmpldev(rdev); 2833#endif 2834 vap->va_seq = zp->z_seq; 2835 vap->va_flags = 0; /* FreeBSD: Reset chflags(2) flags. */ 2836 vap->va_filerev = zp->z_seq; 2837 2838 /* 2839 * Add in any requested optional attributes and the create time. 2840 * Also set the corresponding bits in the returned attribute bitmap. 2841 */ 2842 if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) { 2843 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 2844 xoap->xoa_archive = 2845 ((zp->z_pflags & ZFS_ARCHIVE) != 0); 2846 XVA_SET_RTN(xvap, XAT_ARCHIVE); 2847 } 2848 2849 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 2850 xoap->xoa_readonly = 2851 ((zp->z_pflags & ZFS_READONLY) != 0); 2852 XVA_SET_RTN(xvap, XAT_READONLY); 2853 } 2854 2855 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 2856 xoap->xoa_system = 2857 ((zp->z_pflags & ZFS_SYSTEM) != 0); 2858 XVA_SET_RTN(xvap, XAT_SYSTEM); 2859 } 2860 2861 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 2862 xoap->xoa_hidden = 2863 ((zp->z_pflags & ZFS_HIDDEN) != 0); 2864 XVA_SET_RTN(xvap, XAT_HIDDEN); 2865 } 2866 2867 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 2868 xoap->xoa_nounlink = 2869 ((zp->z_pflags & ZFS_NOUNLINK) != 0); 2870 XVA_SET_RTN(xvap, XAT_NOUNLINK); 2871 } 2872 2873 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 2874 xoap->xoa_immutable = 2875 ((zp->z_pflags & ZFS_IMMUTABLE) != 0); 2876 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 2877 } 2878 2879 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 2880 xoap->xoa_appendonly = 2881 ((zp->z_pflags & ZFS_APPENDONLY) != 0); 2882 XVA_SET_RTN(xvap, XAT_APPENDONLY); 2883 } 2884 2885 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 2886 xoap->xoa_nodump = 2887 ((zp->z_pflags & ZFS_NODUMP) != 0); 2888 XVA_SET_RTN(xvap, XAT_NODUMP); 2889 } 2890 2891 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 2892 xoap->xoa_opaque = 2893 ((zp->z_pflags & ZFS_OPAQUE) != 0); 2894 XVA_SET_RTN(xvap, XAT_OPAQUE); 2895 } 2896 2897 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 2898 xoap->xoa_av_quarantined = 2899 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0); 2900 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 2901 } 2902 2903 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 2904 xoap->xoa_av_modified = 2905 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0); 2906 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 2907 } 2908 2909 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) && 2910 vp->v_type == VREG) { 2911 zfs_sa_get_scanstamp(zp, xvap); 2912 } 2913 2914 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 2915 uint64_t times[2]; 2916 2917 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs), 2918 times, sizeof (times)); 2919 ZFS_TIME_DECODE(&xoap->xoa_createtime, times); 2920 XVA_SET_RTN(xvap, XAT_CREATETIME); 2921 } 2922 2923 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 2924 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0); 2925 XVA_SET_RTN(xvap, XAT_REPARSE); 2926 } 2927 if (XVA_ISSET_REQ(xvap, XAT_GEN)) { 2928 xoap->xoa_generation = zp->z_gen; 2929 XVA_SET_RTN(xvap, XAT_GEN); 2930 } 2931 2932 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 2933 xoap->xoa_offline = 2934 ((zp->z_pflags & ZFS_OFFLINE) != 0); 2935 XVA_SET_RTN(xvap, XAT_OFFLINE); 2936 } 2937 2938 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 2939 xoap->xoa_sparse = 2940 ((zp->z_pflags & ZFS_SPARSE) != 0); 2941 XVA_SET_RTN(xvap, XAT_SPARSE); 2942 } 2943 } 2944 2945 ZFS_TIME_DECODE(&vap->va_atime, zp->z_atime); 2946 ZFS_TIME_DECODE(&vap->va_mtime, mtime); 2947 ZFS_TIME_DECODE(&vap->va_ctime, ctime); 2948 ZFS_TIME_DECODE(&vap->va_birthtime, crtime); 2949 2950 mutex_exit(&zp->z_lock); 2951 2952 sa_object_size(zp->z_sa_hdl, &blksize, &nblocks); 2953 vap->va_blksize = blksize; 2954 vap->va_bytes = nblocks << 9; /* nblocks * 512 */ 2955 2956 if (zp->z_blksz == 0) { 2957 /* 2958 * Block size hasn't been set; suggest maximal I/O transfers. 2959 */ 2960 vap->va_blksize = zfsvfs->z_max_blksz; 2961 } 2962 2963 ZFS_EXIT(zfsvfs); 2964 return (0); 2965} 2966 2967/* 2968 * Set the file attributes to the values contained in the 2969 * vattr structure. 2970 * 2971 * IN: vp - vnode of file to be modified. 2972 * vap - new attribute values. 2973 * If AT_XVATTR set, then optional attrs are being set 2974 * flags - ATTR_UTIME set if non-default time values provided. 2975 * - ATTR_NOACLCHECK (CIFS context only). 2976 * cr - credentials of caller. 2977 * ct - caller context 2978 * 2979 * RETURN: 0 on success, error code on failure. 2980 * 2981 * Timestamps: 2982 * vp - ctime updated, mtime updated if size changed. 2983 */ 2984/* ARGSUSED */ 2985static int 2986zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 2987 caller_context_t *ct) 2988{ 2989 znode_t *zp = VTOZ(vp); 2990 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2991 zilog_t *zilog; 2992 dmu_tx_t *tx; 2993 vattr_t oldva; 2994 xvattr_t tmpxvattr; 2995 uint_t mask = vap->va_mask; 2996 uint_t saved_mask = 0; 2997 uint64_t saved_mode; 2998 int trim_mask = 0; 2999 uint64_t new_mode; 3000 uint64_t new_uid, new_gid; 3001 uint64_t xattr_obj; 3002 uint64_t mtime[2], ctime[2]; 3003 znode_t *attrzp; 3004 int need_policy = FALSE; 3005 int err, err2; 3006 zfs_fuid_info_t *fuidp = NULL; 3007 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */ 3008 xoptattr_t *xoap; 3009 zfs_acl_t *aclp; 3010 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 3011 boolean_t fuid_dirtied = B_FALSE; 3012 sa_bulk_attr_t bulk[7], xattr_bulk[7]; 3013 int count = 0, xattr_count = 0; 3014 3015 if (mask == 0) 3016 return (0); 3017 3018 if (mask & AT_NOSET) 3019 return (SET_ERROR(EINVAL)); 3020 3021 ZFS_ENTER(zfsvfs); 3022 ZFS_VERIFY_ZP(zp); 3023 3024 zilog = zfsvfs->z_log; 3025 3026 /* 3027 * Make sure that if we have ephemeral uid/gid or xvattr specified 3028 * that file system is at proper version level 3029 */ 3030 3031 if (zfsvfs->z_use_fuids == B_FALSE && 3032 (((mask & AT_UID) && IS_EPHEMERAL(vap->va_uid)) || 3033 ((mask & AT_GID) && IS_EPHEMERAL(vap->va_gid)) || 3034 (mask & AT_XVATTR))) { 3035 ZFS_EXIT(zfsvfs); 3036 return (SET_ERROR(EINVAL)); 3037 } 3038 3039 if (mask & AT_SIZE && vp->v_type == VDIR) { 3040 ZFS_EXIT(zfsvfs); 3041 return (SET_ERROR(EISDIR)); 3042 } 3043 3044 if (mask & AT_SIZE && vp->v_type != VREG && vp->v_type != VFIFO) { 3045 ZFS_EXIT(zfsvfs); 3046 return (SET_ERROR(EINVAL)); 3047 } 3048 3049 /* 3050 * If this is an xvattr_t, then get a pointer to the structure of 3051 * optional attributes. If this is NULL, then we have a vattr_t. 3052 */ 3053 xoap = xva_getxoptattr(xvap); 3054 3055 xva_init(&tmpxvattr); 3056 3057 /* 3058 * Immutable files can only alter immutable bit and atime 3059 */ 3060 if ((zp->z_pflags & ZFS_IMMUTABLE) && 3061 ((mask & (AT_SIZE|AT_UID|AT_GID|AT_MTIME|AT_MODE)) || 3062 ((mask & AT_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) { 3063 ZFS_EXIT(zfsvfs); 3064 return (SET_ERROR(EPERM)); 3065 } 3066 3067 if ((mask & AT_SIZE) && (zp->z_pflags & ZFS_READONLY)) { 3068 ZFS_EXIT(zfsvfs); 3069 return (SET_ERROR(EPERM)); 3070 } 3071 3072 /* 3073 * Verify timestamps doesn't overflow 32 bits. 3074 * ZFS can handle large timestamps, but 32bit syscalls can't 3075 * handle times greater than 2039. This check should be removed 3076 * once large timestamps are fully supported. 3077 */ 3078 if (mask & (AT_ATIME | AT_MTIME)) { 3079 if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) || 3080 ((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) { 3081 ZFS_EXIT(zfsvfs); 3082 return (SET_ERROR(EOVERFLOW)); 3083 } 3084 } 3085 3086top: 3087 attrzp = NULL; 3088 aclp = NULL; 3089 3090 /* Can this be moved to before the top label? */ 3091 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { 3092 ZFS_EXIT(zfsvfs); 3093 return (SET_ERROR(EROFS)); 3094 } 3095 3096 /* 3097 * First validate permissions 3098 */ 3099 3100 if (mask & AT_SIZE) { 3101 /* 3102 * XXX - Note, we are not providing any open 3103 * mode flags here (like FNDELAY), so we may 3104 * block if there are locks present... this 3105 * should be addressed in openat(). 3106 */ 3107 /* XXX - would it be OK to generate a log record here? */ 3108 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE); 3109 if (err) { 3110 ZFS_EXIT(zfsvfs); 3111 return (err); 3112 } 3113 } 3114 3115 if (mask & (AT_ATIME|AT_MTIME) || 3116 ((mask & AT_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) || 3117 XVA_ISSET_REQ(xvap, XAT_READONLY) || 3118 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) || 3119 XVA_ISSET_REQ(xvap, XAT_OFFLINE) || 3120 XVA_ISSET_REQ(xvap, XAT_SPARSE) || 3121 XVA_ISSET_REQ(xvap, XAT_CREATETIME) || 3122 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) { 3123 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0, 3124 skipaclchk, cr); 3125 } 3126 3127 if (mask & (AT_UID|AT_GID)) { 3128 int idmask = (mask & (AT_UID|AT_GID)); 3129 int take_owner; 3130 int take_group; 3131 3132 /* 3133 * NOTE: even if a new mode is being set, 3134 * we may clear S_ISUID/S_ISGID bits. 3135 */ 3136 3137 if (!(mask & AT_MODE)) 3138 vap->va_mode = zp->z_mode; 3139 3140 /* 3141 * Take ownership or chgrp to group we are a member of 3142 */ 3143 3144 take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr)); 3145 take_group = (mask & AT_GID) && 3146 zfs_groupmember(zfsvfs, vap->va_gid, cr); 3147 3148 /* 3149 * If both AT_UID and AT_GID are set then take_owner and 3150 * take_group must both be set in order to allow taking 3151 * ownership. 3152 * 3153 * Otherwise, send the check through secpolicy_vnode_setattr() 3154 * 3155 */ 3156 3157 if (((idmask == (AT_UID|AT_GID)) && take_owner && take_group) || 3158 ((idmask == AT_UID) && take_owner) || 3159 ((idmask == AT_GID) && take_group)) { 3160 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0, 3161 skipaclchk, cr) == 0) { 3162 /* 3163 * Remove setuid/setgid for non-privileged users 3164 */ 3165 secpolicy_setid_clear(vap, vp, cr); 3166 trim_mask = (mask & (AT_UID|AT_GID)); 3167 } else { 3168 need_policy = TRUE; 3169 } 3170 } else { 3171 need_policy = TRUE; 3172 } 3173 } 3174 3175 mutex_enter(&zp->z_lock); 3176 oldva.va_mode = zp->z_mode; 3177 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid); 3178 if (mask & AT_XVATTR) { 3179 /* 3180 * Update xvattr mask to include only those attributes 3181 * that are actually changing. 3182 * 3183 * the bits will be restored prior to actually setting 3184 * the attributes so the caller thinks they were set. 3185 */ 3186 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 3187 if (xoap->xoa_appendonly != 3188 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) { 3189 need_policy = TRUE; 3190 } else { 3191 XVA_CLR_REQ(xvap, XAT_APPENDONLY); 3192 XVA_SET_REQ(&tmpxvattr, XAT_APPENDONLY); 3193 } 3194 } 3195 3196 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 3197 if (xoap->xoa_nounlink != 3198 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) { 3199 need_policy = TRUE; 3200 } else { 3201 XVA_CLR_REQ(xvap, XAT_NOUNLINK); 3202 XVA_SET_REQ(&tmpxvattr, XAT_NOUNLINK); 3203 } 3204 } 3205 3206 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 3207 if (xoap->xoa_immutable != 3208 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) { 3209 need_policy = TRUE; 3210 } else { 3211 XVA_CLR_REQ(xvap, XAT_IMMUTABLE); 3212 XVA_SET_REQ(&tmpxvattr, XAT_IMMUTABLE); 3213 } 3214 } 3215 3216 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 3217 if (xoap->xoa_nodump != 3218 ((zp->z_pflags & ZFS_NODUMP) != 0)) { 3219 need_policy = TRUE; 3220 } else { 3221 XVA_CLR_REQ(xvap, XAT_NODUMP); 3222 XVA_SET_REQ(&tmpxvattr, XAT_NODUMP); 3223 } 3224 } 3225 3226 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 3227 if (xoap->xoa_av_modified != 3228 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) { 3229 need_policy = TRUE; 3230 } else { 3231 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED); 3232 XVA_SET_REQ(&tmpxvattr, XAT_AV_MODIFIED); 3233 } 3234 } 3235 3236 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 3237 if ((vp->v_type != VREG && 3238 xoap->xoa_av_quarantined) || 3239 xoap->xoa_av_quarantined != 3240 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) { 3241 need_policy = TRUE; 3242 } else { 3243 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED); 3244 XVA_SET_REQ(&tmpxvattr, XAT_AV_QUARANTINED); 3245 } 3246 } 3247 3248 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 3249 mutex_exit(&zp->z_lock); 3250 ZFS_EXIT(zfsvfs); 3251 return (SET_ERROR(EPERM)); 3252 } 3253 3254 if (need_policy == FALSE && 3255 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) || 3256 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) { 3257 need_policy = TRUE; 3258 } 3259 } 3260 3261 mutex_exit(&zp->z_lock); 3262 3263 if (mask & AT_MODE) { 3264 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) { 3265 err = secpolicy_setid_setsticky_clear(vp, vap, 3266 &oldva, cr); 3267 if (err) { 3268 ZFS_EXIT(zfsvfs); 3269 return (err); 3270 } 3271 trim_mask |= AT_MODE; 3272 } else { 3273 need_policy = TRUE; 3274 } 3275 } 3276 3277 if (need_policy) { 3278 /* 3279 * If trim_mask is set then take ownership 3280 * has been granted or write_acl is present and user 3281 * has the ability to modify mode. In that case remove 3282 * UID|GID and or MODE from mask so that 3283 * secpolicy_vnode_setattr() doesn't revoke it. 3284 */ 3285 3286 if (trim_mask) { 3287 saved_mask = vap->va_mask; 3288 vap->va_mask &= ~trim_mask; 3289 if (trim_mask & AT_MODE) { 3290 /* 3291 * Save the mode, as secpolicy_vnode_setattr() 3292 * will overwrite it with ova.va_mode. 3293 */ 3294 saved_mode = vap->va_mode; 3295 } 3296 } 3297 err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags, 3298 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp); 3299 if (err) { 3300 ZFS_EXIT(zfsvfs); 3301 return (err); 3302 } 3303 3304 if (trim_mask) { 3305 vap->va_mask |= saved_mask; 3306 if (trim_mask & AT_MODE) { 3307 /* 3308 * Recover the mode after 3309 * secpolicy_vnode_setattr(). 3310 */ 3311 vap->va_mode = saved_mode; 3312 } 3313 } 3314 } 3315 3316 /* 3317 * secpolicy_vnode_setattr, or take ownership may have 3318 * changed va_mask 3319 */ 3320 mask = vap->va_mask; 3321 3322 if ((mask & (AT_UID | AT_GID))) { 3323 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 3324 &xattr_obj, sizeof (xattr_obj)); 3325 3326 if (err == 0 && xattr_obj) { 3327 err = zfs_zget(zp->z_zfsvfs, xattr_obj, &attrzp); 3328 if (err) 3329 goto out2; 3330 } 3331 if (mask & AT_UID) { 3332 new_uid = zfs_fuid_create(zfsvfs, 3333 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp); 3334 if (new_uid != zp->z_uid && 3335 zfs_fuid_overquota(zfsvfs, B_FALSE, new_uid)) { 3336 if (attrzp) 3337 VN_RELE(ZTOV(attrzp)); 3338 err = SET_ERROR(EDQUOT); 3339 goto out2; 3340 } 3341 } 3342 3343 if (mask & AT_GID) { 3344 new_gid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid, 3345 cr, ZFS_GROUP, &fuidp); 3346 if (new_gid != zp->z_gid && 3347 zfs_fuid_overquota(zfsvfs, B_TRUE, new_gid)) { 3348 if (attrzp) 3349 VN_RELE(ZTOV(attrzp)); 3350 err = SET_ERROR(EDQUOT); 3351 goto out2; 3352 } 3353 } 3354 } 3355 tx = dmu_tx_create(zfsvfs->z_os); 3356 3357 if (mask & AT_MODE) { 3358 uint64_t pmode = zp->z_mode; 3359 uint64_t acl_obj; 3360 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT); 3361 3362 if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED && 3363 !(zp->z_pflags & ZFS_ACL_TRIVIAL)) { 3364 err = SET_ERROR(EPERM); 3365 goto out; 3366 } 3367 3368 if (err = zfs_acl_chmod_setattr(zp, &aclp, new_mode)) 3369 goto out; 3370 3371 mutex_enter(&zp->z_lock); 3372 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) { 3373 /* 3374 * Are we upgrading ACL from old V0 format 3375 * to V1 format? 3376 */ 3377 if (zfsvfs->z_version >= ZPL_VERSION_FUID && 3378 zfs_znode_acl_version(zp) == 3379 ZFS_ACL_VERSION_INITIAL) { 3380 dmu_tx_hold_free(tx, acl_obj, 0, 3381 DMU_OBJECT_END); 3382 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 3383 0, aclp->z_acl_bytes); 3384 } else { 3385 dmu_tx_hold_write(tx, acl_obj, 0, 3386 aclp->z_acl_bytes); 3387 } 3388 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) { 3389 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 3390 0, aclp->z_acl_bytes); 3391 } 3392 mutex_exit(&zp->z_lock); 3393 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 3394 } else { 3395 if ((mask & AT_XVATTR) && 3396 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) 3397 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 3398 else 3399 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 3400 } 3401 3402 if (attrzp) { 3403 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE); 3404 } 3405 3406 fuid_dirtied = zfsvfs->z_fuid_dirty; 3407 if (fuid_dirtied) 3408 zfs_fuid_txhold(zfsvfs, tx); 3409 3410 zfs_sa_upgrade_txholds(tx, zp); 3411 3412 err = dmu_tx_assign(tx, TXG_WAIT); 3413 if (err) 3414 goto out; 3415 3416 count = 0; 3417 /* 3418 * Set each attribute requested. 3419 * We group settings according to the locks they need to acquire. 3420 * 3421 * Note: you cannot set ctime directly, although it will be 3422 * updated as a side-effect of calling this function. 3423 */ 3424 3425 3426 if (mask & (AT_UID|AT_GID|AT_MODE)) 3427 mutex_enter(&zp->z_acl_lock); 3428 mutex_enter(&zp->z_lock); 3429 3430 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 3431 &zp->z_pflags, sizeof (zp->z_pflags)); 3432 3433 if (attrzp) { 3434 if (mask & (AT_UID|AT_GID|AT_MODE)) 3435 mutex_enter(&attrzp->z_acl_lock); 3436 mutex_enter(&attrzp->z_lock); 3437 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3438 SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags, 3439 sizeof (attrzp->z_pflags)); 3440 } 3441 3442 if (mask & (AT_UID|AT_GID)) { 3443 3444 if (mask & AT_UID) { 3445 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 3446 &new_uid, sizeof (new_uid)); 3447 zp->z_uid = new_uid; 3448 if (attrzp) { 3449 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3450 SA_ZPL_UID(zfsvfs), NULL, &new_uid, 3451 sizeof (new_uid)); 3452 attrzp->z_uid = new_uid; 3453 } 3454 } 3455 3456 if (mask & AT_GID) { 3457 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), 3458 NULL, &new_gid, sizeof (new_gid)); 3459 zp->z_gid = new_gid; 3460 if (attrzp) { 3461 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3462 SA_ZPL_GID(zfsvfs), NULL, &new_gid, 3463 sizeof (new_gid)); 3464 attrzp->z_gid = new_gid; 3465 } 3466 } 3467 if (!(mask & AT_MODE)) { 3468 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), 3469 NULL, &new_mode, sizeof (new_mode)); 3470 new_mode = zp->z_mode; 3471 } 3472 err = zfs_acl_chown_setattr(zp); 3473 ASSERT(err == 0); 3474 if (attrzp) { 3475 err = zfs_acl_chown_setattr(attrzp); 3476 ASSERT(err == 0); 3477 } 3478 } 3479 3480 if (mask & AT_MODE) { 3481 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 3482 &new_mode, sizeof (new_mode)); 3483 zp->z_mode = new_mode; 3484 ASSERT3U((uintptr_t)aclp, !=, 0); 3485 err = zfs_aclset_common(zp, aclp, cr, tx); 3486 ASSERT0(err); 3487 if (zp->z_acl_cached) 3488 zfs_acl_free(zp->z_acl_cached); 3489 zp->z_acl_cached = aclp; 3490 aclp = NULL; 3491 } 3492 3493 3494 if (mask & AT_ATIME) { 3495 ZFS_TIME_ENCODE(&vap->va_atime, zp->z_atime); 3496 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 3497 &zp->z_atime, sizeof (zp->z_atime)); 3498 } 3499 3500 if (mask & AT_MTIME) { 3501 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 3502 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 3503 mtime, sizeof (mtime)); 3504 } 3505 3506 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */ 3507 if (mask & AT_SIZE && !(mask & AT_MTIME)) { 3508 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), 3509 NULL, mtime, sizeof (mtime)); 3510 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 3511 &ctime, sizeof (ctime)); 3512 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 3513 B_TRUE); 3514 } else if (mask != 0) { 3515 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 3516 &ctime, sizeof (ctime)); 3517 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime, 3518 B_TRUE); 3519 if (attrzp) { 3520 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3521 SA_ZPL_CTIME(zfsvfs), NULL, 3522 &ctime, sizeof (ctime)); 3523 zfs_tstamp_update_setup(attrzp, STATE_CHANGED, 3524 mtime, ctime, B_TRUE); 3525 } 3526 } 3527 /* 3528 * Do this after setting timestamps to prevent timestamp 3529 * update from toggling bit 3530 */ 3531 3532 if (xoap && (mask & AT_XVATTR)) { 3533 3534 /* 3535 * restore trimmed off masks 3536 * so that return masks can be set for caller. 3537 */ 3538 3539 if (XVA_ISSET_REQ(&tmpxvattr, XAT_APPENDONLY)) { 3540 XVA_SET_REQ(xvap, XAT_APPENDONLY); 3541 } 3542 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NOUNLINK)) { 3543 XVA_SET_REQ(xvap, XAT_NOUNLINK); 3544 } 3545 if (XVA_ISSET_REQ(&tmpxvattr, XAT_IMMUTABLE)) { 3546 XVA_SET_REQ(xvap, XAT_IMMUTABLE); 3547 } 3548 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NODUMP)) { 3549 XVA_SET_REQ(xvap, XAT_NODUMP); 3550 } 3551 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_MODIFIED)) { 3552 XVA_SET_REQ(xvap, XAT_AV_MODIFIED); 3553 } 3554 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_QUARANTINED)) { 3555 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED); 3556 } 3557 3558 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) 3559 ASSERT(vp->v_type == VREG); 3560 3561 zfs_xvattr_set(zp, xvap, tx); 3562 } 3563 3564 if (fuid_dirtied) 3565 zfs_fuid_sync(zfsvfs, tx); 3566 3567 if (mask != 0) 3568 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp); 3569 3570 mutex_exit(&zp->z_lock); 3571 if (mask & (AT_UID|AT_GID|AT_MODE)) 3572 mutex_exit(&zp->z_acl_lock); 3573 3574 if (attrzp) { 3575 if (mask & (AT_UID|AT_GID|AT_MODE)) 3576 mutex_exit(&attrzp->z_acl_lock); 3577 mutex_exit(&attrzp->z_lock); 3578 } 3579out: 3580 if (err == 0 && attrzp) { 3581 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk, 3582 xattr_count, tx); 3583 ASSERT(err2 == 0); 3584 } 3585 3586 if (attrzp) 3587 VN_RELE(ZTOV(attrzp)); 3588 3589 if (aclp) 3590 zfs_acl_free(aclp); 3591 3592 if (fuidp) { 3593 zfs_fuid_info_free(fuidp); 3594 fuidp = NULL; 3595 } 3596 3597 if (err) { 3598 dmu_tx_abort(tx); 3599 if (err == ERESTART) 3600 goto top; 3601 } else { 3602 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 3603 dmu_tx_commit(tx); 3604 } 3605 3606out2: 3607 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 3608 zil_commit(zilog, 0); 3609 3610 ZFS_EXIT(zfsvfs); 3611 return (err); 3612} 3613 3614typedef struct zfs_zlock { 3615 krwlock_t *zl_rwlock; /* lock we acquired */ 3616 znode_t *zl_znode; /* znode we held */ 3617 struct zfs_zlock *zl_next; /* next in list */ 3618} zfs_zlock_t; 3619 3620/* 3621 * Drop locks and release vnodes that were held by zfs_rename_lock(). 3622 */ 3623static void 3624zfs_rename_unlock(zfs_zlock_t **zlpp) 3625{ 3626 zfs_zlock_t *zl; 3627 3628 while ((zl = *zlpp) != NULL) { 3629 if (zl->zl_znode != NULL) 3630 VN_RELE(ZTOV(zl->zl_znode)); 3631 rw_exit(zl->zl_rwlock); 3632 *zlpp = zl->zl_next; 3633 kmem_free(zl, sizeof (*zl)); 3634 } 3635} 3636 3637/* 3638 * Search back through the directory tree, using the ".." entries. 3639 * Lock each directory in the chain to prevent concurrent renames. 3640 * Fail any attempt to move a directory into one of its own descendants. 3641 * XXX - z_parent_lock can overlap with map or grow locks 3642 */ 3643static int 3644zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp) 3645{ 3646 zfs_zlock_t *zl; 3647 znode_t *zp = tdzp; 3648 uint64_t rootid = zp->z_zfsvfs->z_root; 3649 uint64_t oidp = zp->z_id; 3650 krwlock_t *rwlp = &szp->z_parent_lock; 3651 krw_t rw = RW_WRITER; 3652 3653 /* 3654 * First pass write-locks szp and compares to zp->z_id. 3655 * Later passes read-lock zp and compare to zp->z_parent. 3656 */ 3657 do { 3658 if (!rw_tryenter(rwlp, rw)) { 3659 /* 3660 * Another thread is renaming in this path. 3661 * Note that if we are a WRITER, we don't have any 3662 * parent_locks held yet. 3663 */ 3664 if (rw == RW_READER && zp->z_id > szp->z_id) { 3665 /* 3666 * Drop our locks and restart 3667 */ 3668 zfs_rename_unlock(&zl); 3669 *zlpp = NULL; 3670 zp = tdzp; 3671 oidp = zp->z_id; 3672 rwlp = &szp->z_parent_lock; 3673 rw = RW_WRITER; 3674 continue; 3675 } else { 3676 /* 3677 * Wait for other thread to drop its locks 3678 */ 3679 rw_enter(rwlp, rw); 3680 } 3681 } 3682 3683 zl = kmem_alloc(sizeof (*zl), KM_SLEEP); 3684 zl->zl_rwlock = rwlp; 3685 zl->zl_znode = NULL; 3686 zl->zl_next = *zlpp; 3687 *zlpp = zl; 3688 3689 if (oidp == szp->z_id) /* We're a descendant of szp */ 3690 return (SET_ERROR(EINVAL)); 3691 3692 if (oidp == rootid) /* We've hit the top */ 3693 return (0); 3694 3695 if (rw == RW_READER) { /* i.e. not the first pass */ 3696 int error = zfs_zget(zp->z_zfsvfs, oidp, &zp); 3697 if (error) 3698 return (error); 3699 zl->zl_znode = zp; 3700 } 3701 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zp->z_zfsvfs), 3702 &oidp, sizeof (oidp)); 3703 rwlp = &zp->z_parent_lock; 3704 rw = RW_READER; 3705 3706 } while (zp->z_id != sdzp->z_id); 3707 3708 return (0); 3709} 3710 3711/* 3712 * Move an entry from the provided source directory to the target 3713 * directory. Change the entry name as indicated. 3714 * 3715 * IN: sdvp - Source directory containing the "old entry". 3716 * snm - Old entry name. 3717 * tdvp - Target directory to contain the "new entry". 3718 * tnm - New entry name. 3719 * cr - credentials of caller. 3720 * ct - caller context 3721 * flags - case flags 3722 * 3723 * RETURN: 0 on success, error code on failure. 3724 * 3725 * Timestamps: 3726 * sdvp,tdvp - ctime|mtime updated 3727 */ 3728/*ARGSUSED*/ 3729static int 3730zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr, 3731 caller_context_t *ct, int flags) 3732{ 3733 znode_t *tdzp, *szp, *tzp; 3734 znode_t *sdzp = VTOZ(sdvp); 3735 zfsvfs_t *zfsvfs = sdzp->z_zfsvfs; 3736 zilog_t *zilog; 3737 vnode_t *realvp; 3738 zfs_dirlock_t *sdl, *tdl; 3739 dmu_tx_t *tx; 3740 zfs_zlock_t *zl; 3741 int cmp, serr, terr; 3742 int error = 0; 3743 int zflg = 0; 3744 boolean_t waited = B_FALSE; 3745 3746 ZFS_ENTER(zfsvfs); 3747 ZFS_VERIFY_ZP(sdzp); 3748 zilog = zfsvfs->z_log; 3749 3750 /* 3751 * Make sure we have the real vp for the target directory. 3752 */ 3753 if (VOP_REALVP(tdvp, &realvp, ct) == 0) 3754 tdvp = realvp; 3755 3756 tdzp = VTOZ(tdvp); 3757 ZFS_VERIFY_ZP(tdzp); 3758 3759 /* 3760 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the 3761 * ctldir appear to have the same v_vfsp. 3762 */ 3763 if (tdzp->z_zfsvfs != zfsvfs || zfsctl_is_node(tdvp)) { 3764 ZFS_EXIT(zfsvfs); 3765 return (SET_ERROR(EXDEV)); 3766 } 3767 3768 if (zfsvfs->z_utf8 && u8_validate(tnm, 3769 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 3770 ZFS_EXIT(zfsvfs); 3771 return (SET_ERROR(EILSEQ)); 3772 } 3773 3774 if (flags & FIGNORECASE) 3775 zflg |= ZCILOOK; 3776 3777top: 3778 szp = NULL; 3779 tzp = NULL; 3780 zl = NULL; 3781 3782 /* 3783 * This is to prevent the creation of links into attribute space 3784 * by renaming a linked file into/outof an attribute directory. 3785 * See the comment in zfs_link() for why this is considered bad. 3786 */ 3787 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) { 3788 ZFS_EXIT(zfsvfs); 3789 return (SET_ERROR(EINVAL)); 3790 } 3791 3792 /* 3793 * Lock source and target directory entries. To prevent deadlock, 3794 * a lock ordering must be defined. We lock the directory with 3795 * the smallest object id first, or if it's a tie, the one with 3796 * the lexically first name. 3797 */ 3798 if (sdzp->z_id < tdzp->z_id) { 3799 cmp = -1; 3800 } else if (sdzp->z_id > tdzp->z_id) { 3801 cmp = 1; 3802 } else { 3803 /* 3804 * First compare the two name arguments without 3805 * considering any case folding. 3806 */ 3807 int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER); 3808 3809 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error); 3810 ASSERT(error == 0 || !zfsvfs->z_utf8); 3811 if (cmp == 0) { 3812 /* 3813 * POSIX: "If the old argument and the new argument 3814 * both refer to links to the same existing file, 3815 * the rename() function shall return successfully 3816 * and perform no other action." 3817 */ 3818 ZFS_EXIT(zfsvfs); 3819 return (0); 3820 } 3821 /* 3822 * If the file system is case-folding, then we may 3823 * have some more checking to do. A case-folding file 3824 * system is either supporting mixed case sensitivity 3825 * access or is completely case-insensitive. Note 3826 * that the file system is always case preserving. 3827 * 3828 * In mixed sensitivity mode case sensitive behavior 3829 * is the default. FIGNORECASE must be used to 3830 * explicitly request case insensitive behavior. 3831 * 3832 * If the source and target names provided differ only 3833 * by case (e.g., a request to rename 'tim' to 'Tim'), 3834 * we will treat this as a special case in the 3835 * case-insensitive mode: as long as the source name 3836 * is an exact match, we will allow this to proceed as 3837 * a name-change request. 3838 */ 3839 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 3840 (zfsvfs->z_case == ZFS_CASE_MIXED && 3841 flags & FIGNORECASE)) && 3842 u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST, 3843 &error) == 0) { 3844 /* 3845 * case preserving rename request, require exact 3846 * name matches 3847 */ 3848 zflg |= ZCIEXACT; 3849 zflg &= ~ZCILOOK; 3850 } 3851 } 3852 3853 /* 3854 * If the source and destination directories are the same, we should 3855 * grab the z_name_lock of that directory only once. 3856 */ 3857 if (sdzp == tdzp) { 3858 zflg |= ZHAVELOCK; 3859 rw_enter(&sdzp->z_name_lock, RW_READER); 3860 } 3861 3862 if (cmp < 0) { 3863 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp, 3864 ZEXISTS | zflg, NULL, NULL); 3865 terr = zfs_dirent_lock(&tdl, 3866 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL); 3867 } else { 3868 terr = zfs_dirent_lock(&tdl, 3869 tdzp, tnm, &tzp, zflg, NULL, NULL); 3870 serr = zfs_dirent_lock(&sdl, 3871 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg, 3872 NULL, NULL); 3873 } 3874 3875 if (serr) { 3876 /* 3877 * Source entry invalid or not there. 3878 */ 3879 if (!terr) { 3880 zfs_dirent_unlock(tdl); 3881 if (tzp) 3882 VN_RELE(ZTOV(tzp)); 3883 } 3884 3885 if (sdzp == tdzp) 3886 rw_exit(&sdzp->z_name_lock); 3887 3888 /* 3889 * FreeBSD: In OpenSolaris they only check if rename source is 3890 * ".." here, because "." is handled in their lookup. This is 3891 * not the case for FreeBSD, so we check for "." explicitly. 3892 */ 3893 if (strcmp(snm, ".") == 0 || strcmp(snm, "..") == 0) 3894 serr = SET_ERROR(EINVAL); 3895 ZFS_EXIT(zfsvfs); 3896 return (serr); 3897 } 3898 if (terr) { 3899 zfs_dirent_unlock(sdl); 3900 VN_RELE(ZTOV(szp)); 3901 3902 if (sdzp == tdzp) 3903 rw_exit(&sdzp->z_name_lock); 3904 3905 if (strcmp(tnm, "..") == 0) 3906 terr = SET_ERROR(EINVAL); 3907 ZFS_EXIT(zfsvfs); 3908 return (terr); 3909 } 3910 3911 /* 3912 * Must have write access at the source to remove the old entry 3913 * and write access at the target to create the new entry. 3914 * Note that if target and source are the same, this can be 3915 * done in a single check. 3916 */ 3917 3918 if (error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)) 3919 goto out; 3920 3921 if (ZTOV(szp)->v_type == VDIR) { 3922 /* 3923 * Check to make sure rename is valid. 3924 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d 3925 */ 3926 if (error = zfs_rename_lock(szp, tdzp, sdzp, &zl)) 3927 goto out; 3928 } 3929 3930 /* 3931 * Does target exist? 3932 */ 3933 if (tzp) { 3934 /* 3935 * Source and target must be the same type. 3936 */ 3937 if (ZTOV(szp)->v_type == VDIR) { 3938 if (ZTOV(tzp)->v_type != VDIR) { 3939 error = SET_ERROR(ENOTDIR); 3940 goto out; 3941 } 3942 } else { 3943 if (ZTOV(tzp)->v_type == VDIR) { 3944 error = SET_ERROR(EISDIR); 3945 goto out; 3946 } 3947 } 3948 /* 3949 * POSIX dictates that when the source and target 3950 * entries refer to the same file object, rename 3951 * must do nothing and exit without error. 3952 */ 3953 if (szp->z_id == tzp->z_id) { 3954 error = 0; 3955 goto out; 3956 } 3957 } 3958 3959 vnevent_rename_src(ZTOV(szp), sdvp, snm, ct); 3960 if (tzp) 3961 vnevent_rename_dest(ZTOV(tzp), tdvp, tnm, ct); 3962 3963 /* 3964 * notify the target directory if it is not the same 3965 * as source directory. 3966 */ 3967 if (tdvp != sdvp) { 3968 vnevent_rename_dest_dir(tdvp, ct); 3969 } 3970 3971 tx = dmu_tx_create(zfsvfs->z_os); 3972 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE); 3973 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE); 3974 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm); 3975 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm); 3976 if (sdzp != tdzp) { 3977 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE); 3978 zfs_sa_upgrade_txholds(tx, tdzp); 3979 } 3980 if (tzp) { 3981 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE); 3982 zfs_sa_upgrade_txholds(tx, tzp); 3983 } 3984 3985 zfs_sa_upgrade_txholds(tx, szp); 3986 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 3987 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 3988 if (error) { 3989 if (zl != NULL) 3990 zfs_rename_unlock(&zl); 3991 zfs_dirent_unlock(sdl); 3992 zfs_dirent_unlock(tdl); 3993 3994 if (sdzp == tdzp) 3995 rw_exit(&sdzp->z_name_lock); 3996 3997 VN_RELE(ZTOV(szp)); 3998 if (tzp) 3999 VN_RELE(ZTOV(tzp)); 4000 if (error == ERESTART) { 4001 waited = B_TRUE; 4002 dmu_tx_wait(tx); 4003 dmu_tx_abort(tx); 4004 goto top; 4005 } 4006 dmu_tx_abort(tx); 4007 ZFS_EXIT(zfsvfs); 4008 return (error); 4009 } 4010 4011 if (tzp) /* Attempt to remove the existing target */ 4012 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL); 4013 4014 if (error == 0) { 4015 error = zfs_link_create(tdl, szp, tx, ZRENAMING); 4016 if (error == 0) { 4017 szp->z_pflags |= ZFS_AV_MODIFIED; 4018 4019 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs), 4020 (void *)&szp->z_pflags, sizeof (uint64_t), tx); 4021 ASSERT0(error); 4022 4023 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL); 4024 if (error == 0) { 4025 zfs_log_rename(zilog, tx, TX_RENAME | 4026 (flags & FIGNORECASE ? TX_CI : 0), sdzp, 4027 sdl->dl_name, tdzp, tdl->dl_name, szp); 4028 4029 /* 4030 * Update path information for the target vnode 4031 */ 4032 vn_renamepath(tdvp, ZTOV(szp), tnm, 4033 strlen(tnm)); 4034 } else { 4035 /* 4036 * At this point, we have successfully created 4037 * the target name, but have failed to remove 4038 * the source name. Since the create was done 4039 * with the ZRENAMING flag, there are 4040 * complications; for one, the link count is 4041 * wrong. The easiest way to deal with this 4042 * is to remove the newly created target, and 4043 * return the original error. This must 4044 * succeed; fortunately, it is very unlikely to 4045 * fail, since we just created it. 4046 */ 4047 VERIFY3U(zfs_link_destroy(tdl, szp, tx, 4048 ZRENAMING, NULL), ==, 0); 4049 } 4050 } 4051#ifdef FREEBSD_NAMECACHE 4052 if (error == 0) { 4053 cache_purge(sdvp); 4054 cache_purge(tdvp); 4055 cache_purge(ZTOV(szp)); 4056 if (tzp) 4057 cache_purge(ZTOV(tzp)); 4058 } 4059#endif 4060 } 4061 4062 dmu_tx_commit(tx); 4063out: 4064 if (zl != NULL) 4065 zfs_rename_unlock(&zl); 4066 4067 zfs_dirent_unlock(sdl); 4068 zfs_dirent_unlock(tdl); 4069 4070 if (sdzp == tdzp) 4071 rw_exit(&sdzp->z_name_lock); 4072 4073 4074 VN_RELE(ZTOV(szp)); 4075 if (tzp) 4076 VN_RELE(ZTOV(tzp)); 4077 4078 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4079 zil_commit(zilog, 0); 4080 4081 ZFS_EXIT(zfsvfs); 4082 4083 return (error); 4084} 4085 4086/* 4087 * Insert the indicated symbolic reference entry into the directory. 4088 * 4089 * IN: dvp - Directory to contain new symbolic link. 4090 * link - Name for new symlink entry. 4091 * vap - Attributes of new entry. 4092 * cr - credentials of caller. 4093 * ct - caller context 4094 * flags - case flags 4095 * 4096 * RETURN: 0 on success, error code on failure. 4097 * 4098 * Timestamps: 4099 * dvp - ctime|mtime updated 4100 */ 4101/*ARGSUSED*/ 4102static int 4103zfs_symlink(vnode_t *dvp, vnode_t **vpp, char *name, vattr_t *vap, char *link, 4104 cred_t *cr, kthread_t *td) 4105{ 4106 znode_t *zp, *dzp = VTOZ(dvp); 4107 zfs_dirlock_t *dl; 4108 dmu_tx_t *tx; 4109 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 4110 zilog_t *zilog; 4111 uint64_t len = strlen(link); 4112 int error; 4113 int zflg = ZNEW; 4114 zfs_acl_ids_t acl_ids; 4115 boolean_t fuid_dirtied; 4116 uint64_t txtype = TX_SYMLINK; 4117 boolean_t waited = B_FALSE; 4118 int flags = 0; 4119 4120 ASSERT(vap->va_type == VLNK); 4121 4122 ZFS_ENTER(zfsvfs); 4123 ZFS_VERIFY_ZP(dzp); 4124 zilog = zfsvfs->z_log; 4125 4126 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name), 4127 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 4128 ZFS_EXIT(zfsvfs); 4129 return (SET_ERROR(EILSEQ)); 4130 } 4131 if (flags & FIGNORECASE) 4132 zflg |= ZCILOOK; 4133 4134 if (len > MAXPATHLEN) { 4135 ZFS_EXIT(zfsvfs); 4136 return (SET_ERROR(ENAMETOOLONG)); 4137 } 4138 4139 if ((error = zfs_acl_ids_create(dzp, 0, 4140 vap, cr, NULL, &acl_ids)) != 0) { 4141 ZFS_EXIT(zfsvfs); 4142 return (error); 4143 } 4144 4145 getnewvnode_reserve(1); 4146 4147top: 4148 /* 4149 * Attempt to lock directory; fail if entry already exists. 4150 */ 4151 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL); 4152 if (error) { 4153 zfs_acl_ids_free(&acl_ids); 4154 getnewvnode_drop_reserve(); 4155 ZFS_EXIT(zfsvfs); 4156 return (error); 4157 } 4158 4159 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 4160 zfs_acl_ids_free(&acl_ids); 4161 zfs_dirent_unlock(dl); 4162 getnewvnode_drop_reserve(); 4163 ZFS_EXIT(zfsvfs); 4164 return (error); 4165 } 4166 4167 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 4168 zfs_acl_ids_free(&acl_ids); 4169 zfs_dirent_unlock(dl); 4170 getnewvnode_drop_reserve(); 4171 ZFS_EXIT(zfsvfs); 4172 return (SET_ERROR(EDQUOT)); 4173 } 4174 tx = dmu_tx_create(zfsvfs->z_os); 4175 fuid_dirtied = zfsvfs->z_fuid_dirty; 4176 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len)); 4177 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 4178 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 4179 ZFS_SA_BASE_ATTR_SIZE + len); 4180 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); 4181 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 4182 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 4183 acl_ids.z_aclp->z_acl_bytes); 4184 } 4185 if (fuid_dirtied) 4186 zfs_fuid_txhold(zfsvfs, tx); 4187 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 4188 if (error) { 4189 zfs_dirent_unlock(dl); 4190 if (error == ERESTART) { 4191 waited = B_TRUE; 4192 dmu_tx_wait(tx); 4193 dmu_tx_abort(tx); 4194 goto top; 4195 } 4196 zfs_acl_ids_free(&acl_ids); 4197 dmu_tx_abort(tx); 4198 getnewvnode_drop_reserve(); 4199 ZFS_EXIT(zfsvfs); 4200 return (error); 4201 } 4202 4203 /* 4204 * Create a new object for the symlink. 4205 * for version 4 ZPL datsets the symlink will be an SA attribute 4206 */ 4207 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 4208 4209 if (fuid_dirtied) 4210 zfs_fuid_sync(zfsvfs, tx); 4211 4212 mutex_enter(&zp->z_lock); 4213 if (zp->z_is_sa) 4214 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs), 4215 link, len, tx); 4216 else 4217 zfs_sa_symlink(zp, link, len, tx); 4218 mutex_exit(&zp->z_lock); 4219 4220 zp->z_size = len; 4221 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs), 4222 &zp->z_size, sizeof (zp->z_size), tx); 4223 /* 4224 * Insert the new object into the directory. 4225 */ 4226 (void) zfs_link_create(dl, zp, tx, ZNEW); 4227 4228 if (flags & FIGNORECASE) 4229 txtype |= TX_CI; 4230 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link); 4231 *vpp = ZTOV(zp); 4232 4233 zfs_acl_ids_free(&acl_ids); 4234 4235 dmu_tx_commit(tx); 4236 4237 getnewvnode_drop_reserve(); 4238 4239 zfs_dirent_unlock(dl); 4240 4241 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4242 zil_commit(zilog, 0); 4243 4244 ZFS_EXIT(zfsvfs); 4245 return (error); 4246} 4247 4248/* 4249 * Return, in the buffer contained in the provided uio structure, 4250 * the symbolic path referred to by vp. 4251 * 4252 * IN: vp - vnode of symbolic link. 4253 * uio - structure to contain the link path. 4254 * cr - credentials of caller. 4255 * ct - caller context 4256 * 4257 * OUT: uio - structure containing the link path. 4258 * 4259 * RETURN: 0 on success, error code on failure. 4260 * 4261 * Timestamps: 4262 * vp - atime updated 4263 */ 4264/* ARGSUSED */ 4265static int 4266zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr, caller_context_t *ct) 4267{ 4268 znode_t *zp = VTOZ(vp); 4269 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4270 int error; 4271 4272 ZFS_ENTER(zfsvfs); 4273 ZFS_VERIFY_ZP(zp); 4274 4275 mutex_enter(&zp->z_lock); 4276 if (zp->z_is_sa) 4277 error = sa_lookup_uio(zp->z_sa_hdl, 4278 SA_ZPL_SYMLINK(zfsvfs), uio); 4279 else 4280 error = zfs_sa_readlink(zp, uio); 4281 mutex_exit(&zp->z_lock); 4282 4283 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 4284 4285 ZFS_EXIT(zfsvfs); 4286 return (error); 4287} 4288 4289/* 4290 * Insert a new entry into directory tdvp referencing svp. 4291 * 4292 * IN: tdvp - Directory to contain new entry. 4293 * svp - vnode of new entry. 4294 * name - name of new entry. 4295 * cr - credentials of caller. 4296 * ct - caller context 4297 * 4298 * RETURN: 0 on success, error code on failure. 4299 * 4300 * Timestamps: 4301 * tdvp - ctime|mtime updated 4302 * svp - ctime updated 4303 */ 4304/* ARGSUSED */ 4305static int 4306zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr, 4307 caller_context_t *ct, int flags) 4308{ 4309 znode_t *dzp = VTOZ(tdvp); 4310 znode_t *tzp, *szp; 4311 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 4312 zilog_t *zilog; 4313 zfs_dirlock_t *dl; 4314 dmu_tx_t *tx; 4315 vnode_t *realvp; 4316 int error; 4317 int zf = ZNEW; 4318 uint64_t parent; 4319 uid_t owner; 4320 boolean_t waited = B_FALSE; 4321 4322 ASSERT(tdvp->v_type == VDIR); 4323 4324 ZFS_ENTER(zfsvfs); 4325 ZFS_VERIFY_ZP(dzp); 4326 zilog = zfsvfs->z_log; 4327 4328 if (VOP_REALVP(svp, &realvp, ct) == 0) 4329 svp = realvp; 4330 4331 /* 4332 * POSIX dictates that we return EPERM here. 4333 * Better choices include ENOTSUP or EISDIR. 4334 */ 4335 if (svp->v_type == VDIR) { 4336 ZFS_EXIT(zfsvfs); 4337 return (SET_ERROR(EPERM)); 4338 } 4339 4340 szp = VTOZ(svp); 4341 ZFS_VERIFY_ZP(szp); 4342 4343 /* 4344 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the 4345 * ctldir appear to have the same v_vfsp. 4346 */ 4347 if (szp->z_zfsvfs != zfsvfs || zfsctl_is_node(svp)) { 4348 ZFS_EXIT(zfsvfs); 4349 return (SET_ERROR(EXDEV)); 4350 } 4351 4352 /* Prevent links to .zfs/shares files */ 4353 4354 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), 4355 &parent, sizeof (uint64_t))) != 0) { 4356 ZFS_EXIT(zfsvfs); 4357 return (error); 4358 } 4359 if (parent == zfsvfs->z_shares_dir) { 4360 ZFS_EXIT(zfsvfs); 4361 return (SET_ERROR(EPERM)); 4362 } 4363 4364 if (zfsvfs->z_utf8 && u8_validate(name, 4365 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 4366 ZFS_EXIT(zfsvfs); 4367 return (SET_ERROR(EILSEQ)); 4368 } 4369 if (flags & FIGNORECASE) 4370 zf |= ZCILOOK; 4371 4372 /* 4373 * We do not support links between attributes and non-attributes 4374 * because of the potential security risk of creating links 4375 * into "normal" file space in order to circumvent restrictions 4376 * imposed in attribute space. 4377 */ 4378 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) { 4379 ZFS_EXIT(zfsvfs); 4380 return (SET_ERROR(EINVAL)); 4381 } 4382 4383 4384 owner = zfs_fuid_map_id(zfsvfs, szp->z_uid, cr, ZFS_OWNER); 4385 if (owner != crgetuid(cr) && secpolicy_basic_link(svp, cr) != 0) { 4386 ZFS_EXIT(zfsvfs); 4387 return (SET_ERROR(EPERM)); 4388 } 4389 4390 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 4391 ZFS_EXIT(zfsvfs); 4392 return (error); 4393 } 4394 4395top: 4396 /* 4397 * Attempt to lock directory; fail if entry already exists. 4398 */ 4399 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL); 4400 if (error) { 4401 ZFS_EXIT(zfsvfs); 4402 return (error); 4403 } 4404 4405 tx = dmu_tx_create(zfsvfs->z_os); 4406 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE); 4407 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 4408 zfs_sa_upgrade_txholds(tx, szp); 4409 zfs_sa_upgrade_txholds(tx, dzp); 4410 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 4411 if (error) { 4412 zfs_dirent_unlock(dl); 4413 if (error == ERESTART) { 4414 waited = B_TRUE; 4415 dmu_tx_wait(tx); 4416 dmu_tx_abort(tx); 4417 goto top; 4418 } 4419 dmu_tx_abort(tx); 4420 ZFS_EXIT(zfsvfs); 4421 return (error); 4422 } 4423 4424 error = zfs_link_create(dl, szp, tx, 0); 4425 4426 if (error == 0) { 4427 uint64_t txtype = TX_LINK; 4428 if (flags & FIGNORECASE) 4429 txtype |= TX_CI; 4430 zfs_log_link(zilog, tx, txtype, dzp, szp, name); 4431 } 4432 4433 dmu_tx_commit(tx); 4434 4435 zfs_dirent_unlock(dl); 4436 4437 if (error == 0) { 4438 vnevent_link(svp, ct); 4439 } 4440 4441 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4442 zil_commit(zilog, 0); 4443 4444 ZFS_EXIT(zfsvfs); 4445 return (error); 4446} 4447 4448#ifdef sun 4449/* 4450 * zfs_null_putapage() is used when the file system has been force 4451 * unmounted. It just drops the pages. 4452 */ 4453/* ARGSUSED */ 4454static int 4455zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 4456 size_t *lenp, int flags, cred_t *cr) 4457{ 4458 pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR); 4459 return (0); 4460} 4461 4462/* 4463 * Push a page out to disk, klustering if possible. 4464 * 4465 * IN: vp - file to push page to. 4466 * pp - page to push. 4467 * flags - additional flags. 4468 * cr - credentials of caller. 4469 * 4470 * OUT: offp - start of range pushed. 4471 * lenp - len of range pushed. 4472 * 4473 * RETURN: 0 on success, error code on failure. 4474 * 4475 * NOTE: callers must have locked the page to be pushed. On 4476 * exit, the page (and all other pages in the kluster) must be 4477 * unlocked. 4478 */ 4479/* ARGSUSED */ 4480static int 4481zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 4482 size_t *lenp, int flags, cred_t *cr) 4483{ 4484 znode_t *zp = VTOZ(vp); 4485 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4486 dmu_tx_t *tx; 4487 u_offset_t off, koff; 4488 size_t len, klen; 4489 int err; 4490 4491 off = pp->p_offset; 4492 len = PAGESIZE; 4493 /* 4494 * If our blocksize is bigger than the page size, try to kluster 4495 * multiple pages so that we write a full block (thus avoiding 4496 * a read-modify-write). 4497 */ 4498 if (off < zp->z_size && zp->z_blksz > PAGESIZE) { 4499 klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE); 4500 koff = ISP2(klen) ? P2ALIGN(off, (u_offset_t)klen) : 0; 4501 ASSERT(koff <= zp->z_size); 4502 if (koff + klen > zp->z_size) 4503 klen = P2ROUNDUP(zp->z_size - koff, (uint64_t)PAGESIZE); 4504 pp = pvn_write_kluster(vp, pp, &off, &len, koff, klen, flags); 4505 } 4506 ASSERT3U(btop(len), ==, btopr(len)); 4507 4508 /* 4509 * Can't push pages past end-of-file. 4510 */ 4511 if (off >= zp->z_size) { 4512 /* ignore all pages */ 4513 err = 0; 4514 goto out; 4515 } else if (off + len > zp->z_size) { 4516 int npages = btopr(zp->z_size - off); 4517 page_t *trunc; 4518 4519 page_list_break(&pp, &trunc, npages); 4520 /* ignore pages past end of file */ 4521 if (trunc) 4522 pvn_write_done(trunc, flags); 4523 len = zp->z_size - off; 4524 } 4525 4526 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 4527 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 4528 err = SET_ERROR(EDQUOT); 4529 goto out; 4530 } 4531 tx = dmu_tx_create(zfsvfs->z_os); 4532 dmu_tx_hold_write(tx, zp->z_id, off, len); 4533 4534 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 4535 zfs_sa_upgrade_txholds(tx, zp); 4536 err = dmu_tx_assign(tx, TXG_WAIT); 4537 if (err != 0) { 4538 dmu_tx_abort(tx); 4539 goto out; 4540 } 4541 4542 if (zp->z_blksz <= PAGESIZE) { 4543 caddr_t va = zfs_map_page(pp, S_READ); 4544 ASSERT3U(len, <=, PAGESIZE); 4545 dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx); 4546 zfs_unmap_page(pp, va); 4547 } else { 4548 err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, pp, tx); 4549 } 4550 4551 if (err == 0) { 4552 uint64_t mtime[2], ctime[2]; 4553 sa_bulk_attr_t bulk[3]; 4554 int count = 0; 4555 4556 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 4557 &mtime, 16); 4558 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 4559 &ctime, 16); 4560 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 4561 &zp->z_pflags, 8); 4562 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 4563 B_TRUE); 4564 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0); 4565 } 4566 dmu_tx_commit(tx); 4567 4568out: 4569 pvn_write_done(pp, (err ? B_ERROR : 0) | flags); 4570 if (offp) 4571 *offp = off; 4572 if (lenp) 4573 *lenp = len; 4574 4575 return (err); 4576} 4577 4578/* 4579 * Copy the portion of the file indicated from pages into the file. 4580 * The pages are stored in a page list attached to the files vnode. 4581 * 4582 * IN: vp - vnode of file to push page data to. 4583 * off - position in file to put data. 4584 * len - amount of data to write. 4585 * flags - flags to control the operation. 4586 * cr - credentials of caller. 4587 * ct - caller context. 4588 * 4589 * RETURN: 0 on success, error code on failure. 4590 * 4591 * Timestamps: 4592 * vp - ctime|mtime updated 4593 */ 4594/*ARGSUSED*/ 4595static int 4596zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr, 4597 caller_context_t *ct) 4598{ 4599 znode_t *zp = VTOZ(vp); 4600 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4601 page_t *pp; 4602 size_t io_len; 4603 u_offset_t io_off; 4604 uint_t blksz; 4605 rl_t *rl; 4606 int error = 0; 4607 4608 ZFS_ENTER(zfsvfs); 4609 ZFS_VERIFY_ZP(zp); 4610 4611 /* 4612 * Align this request to the file block size in case we kluster. 4613 * XXX - this can result in pretty aggresive locking, which can 4614 * impact simultanious read/write access. One option might be 4615 * to break up long requests (len == 0) into block-by-block 4616 * operations to get narrower locking. 4617 */ 4618 blksz = zp->z_blksz; 4619 if (ISP2(blksz)) 4620 io_off = P2ALIGN_TYPED(off, blksz, u_offset_t); 4621 else 4622 io_off = 0; 4623 if (len > 0 && ISP2(blksz)) 4624 io_len = P2ROUNDUP_TYPED(len + (off - io_off), blksz, size_t); 4625 else 4626 io_len = 0; 4627 4628 if (io_len == 0) { 4629 /* 4630 * Search the entire vp list for pages >= io_off. 4631 */ 4632 rl = zfs_range_lock(zp, io_off, UINT64_MAX, RL_WRITER); 4633 error = pvn_vplist_dirty(vp, io_off, zfs_putapage, flags, cr); 4634 goto out; 4635 } 4636 rl = zfs_range_lock(zp, io_off, io_len, RL_WRITER); 4637 4638 if (off > zp->z_size) { 4639 /* past end of file */ 4640 zfs_range_unlock(rl); 4641 ZFS_EXIT(zfsvfs); 4642 return (0); 4643 } 4644 4645 len = MIN(io_len, P2ROUNDUP(zp->z_size, PAGESIZE) - io_off); 4646 4647 for (off = io_off; io_off < off + len; io_off += io_len) { 4648 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { 4649 pp = page_lookup(vp, io_off, 4650 (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED); 4651 } else { 4652 pp = page_lookup_nowait(vp, io_off, 4653 (flags & B_FREE) ? SE_EXCL : SE_SHARED); 4654 } 4655 4656 if (pp != NULL && pvn_getdirty(pp, flags)) { 4657 int err; 4658 4659 /* 4660 * Found a dirty page to push 4661 */ 4662 err = zfs_putapage(vp, pp, &io_off, &io_len, flags, cr); 4663 if (err) 4664 error = err; 4665 } else { 4666 io_len = PAGESIZE; 4667 } 4668 } 4669out: 4670 zfs_range_unlock(rl); 4671 if ((flags & B_ASYNC) == 0 || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4672 zil_commit(zfsvfs->z_log, zp->z_id); 4673 ZFS_EXIT(zfsvfs); 4674 return (error); 4675} 4676#endif /* sun */ 4677 4678/*ARGSUSED*/ 4679void 4680zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 4681{ 4682 znode_t *zp = VTOZ(vp); 4683 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4684 int error; 4685 4686 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER); 4687 if (zp->z_sa_hdl == NULL) { 4688 /* 4689 * The fs has been unmounted, or we did a 4690 * suspend/resume and this file no longer exists. 4691 */ 4692 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4693 vrecycle(vp); 4694 return; 4695 } 4696 4697 mutex_enter(&zp->z_lock); 4698 if (zp->z_unlinked) { 4699 /* 4700 * Fast path to recycle a vnode of a removed file. 4701 */ 4702 mutex_exit(&zp->z_lock); 4703 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4704 vrecycle(vp); 4705 return; 4706 } 4707 mutex_exit(&zp->z_lock); 4708 4709 if (zp->z_atime_dirty && zp->z_unlinked == 0) { 4710 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os); 4711 4712 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 4713 zfs_sa_upgrade_txholds(tx, zp); 4714 error = dmu_tx_assign(tx, TXG_WAIT); 4715 if (error) { 4716 dmu_tx_abort(tx); 4717 } else { 4718 mutex_enter(&zp->z_lock); 4719 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs), 4720 (void *)&zp->z_atime, sizeof (zp->z_atime), tx); 4721 zp->z_atime_dirty = 0; 4722 mutex_exit(&zp->z_lock); 4723 dmu_tx_commit(tx); 4724 } 4725 } 4726 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4727} 4728 4729#ifdef sun 4730/* 4731 * Bounds-check the seek operation. 4732 * 4733 * IN: vp - vnode seeking within 4734 * ooff - old file offset 4735 * noffp - pointer to new file offset 4736 * ct - caller context 4737 * 4738 * RETURN: 0 on success, EINVAL if new offset invalid. 4739 */ 4740/* ARGSUSED */ 4741static int 4742zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, 4743 caller_context_t *ct) 4744{ 4745 if (vp->v_type == VDIR) 4746 return (0); 4747 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); 4748} 4749 4750/* 4751 * Pre-filter the generic locking function to trap attempts to place 4752 * a mandatory lock on a memory mapped file. 4753 */ 4754static int 4755zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset, 4756 flk_callback_t *flk_cbp, cred_t *cr, caller_context_t *ct) 4757{ 4758 znode_t *zp = VTOZ(vp); 4759 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4760 4761 ZFS_ENTER(zfsvfs); 4762 ZFS_VERIFY_ZP(zp); 4763 4764 /* 4765 * We are following the UFS semantics with respect to mapcnt 4766 * here: If we see that the file is mapped already, then we will 4767 * return an error, but we don't worry about races between this 4768 * function and zfs_map(). 4769 */ 4770 if (zp->z_mapcnt > 0 && MANDMODE(zp->z_mode)) { 4771 ZFS_EXIT(zfsvfs); 4772 return (SET_ERROR(EAGAIN)); 4773 } 4774 ZFS_EXIT(zfsvfs); 4775 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct)); 4776} 4777 4778/* 4779 * If we can't find a page in the cache, we will create a new page 4780 * and fill it with file data. For efficiency, we may try to fill 4781 * multiple pages at once (klustering) to fill up the supplied page 4782 * list. Note that the pages to be filled are held with an exclusive 4783 * lock to prevent access by other threads while they are being filled. 4784 */ 4785static int 4786zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg, 4787 caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw) 4788{ 4789 znode_t *zp = VTOZ(vp); 4790 page_t *pp, *cur_pp; 4791 objset_t *os = zp->z_zfsvfs->z_os; 4792 u_offset_t io_off, total; 4793 size_t io_len; 4794 int err; 4795 4796 if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE) { 4797 /* 4798 * We only have a single page, don't bother klustering 4799 */ 4800 io_off = off; 4801 io_len = PAGESIZE; 4802 pp = page_create_va(vp, io_off, io_len, 4803 PG_EXCL | PG_WAIT, seg, addr); 4804 } else { 4805 /* 4806 * Try to find enough pages to fill the page list 4807 */ 4808 pp = pvn_read_kluster(vp, off, seg, addr, &io_off, 4809 &io_len, off, plsz, 0); 4810 } 4811 if (pp == NULL) { 4812 /* 4813 * The page already exists, nothing to do here. 4814 */ 4815 *pl = NULL; 4816 return (0); 4817 } 4818 4819 /* 4820 * Fill the pages in the kluster. 4821 */ 4822 cur_pp = pp; 4823 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) { 4824 caddr_t va; 4825 4826 ASSERT3U(io_off, ==, cur_pp->p_offset); 4827 va = zfs_map_page(cur_pp, S_WRITE); 4828 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va, 4829 DMU_READ_PREFETCH); 4830 zfs_unmap_page(cur_pp, va); 4831 if (err) { 4832 /* On error, toss the entire kluster */ 4833 pvn_read_done(pp, B_ERROR); 4834 /* convert checksum errors into IO errors */ 4835 if (err == ECKSUM) 4836 err = SET_ERROR(EIO); 4837 return (err); 4838 } 4839 cur_pp = cur_pp->p_next; 4840 } 4841 4842 /* 4843 * Fill in the page list array from the kluster starting 4844 * from the desired offset `off'. 4845 * NOTE: the page list will always be null terminated. 4846 */ 4847 pvn_plist_init(pp, pl, plsz, off, io_len, rw); 4848 ASSERT(pl == NULL || (*pl)->p_offset == off); 4849 4850 return (0); 4851} 4852 4853/* 4854 * Return pointers to the pages for the file region [off, off + len] 4855 * in the pl array. If plsz is greater than len, this function may 4856 * also return page pointers from after the specified region 4857 * (i.e. the region [off, off + plsz]). These additional pages are 4858 * only returned if they are already in the cache, or were created as 4859 * part of a klustered read. 4860 * 4861 * IN: vp - vnode of file to get data from. 4862 * off - position in file to get data from. 4863 * len - amount of data to retrieve. 4864 * plsz - length of provided page list. 4865 * seg - segment to obtain pages for. 4866 * addr - virtual address of fault. 4867 * rw - mode of created pages. 4868 * cr - credentials of caller. 4869 * ct - caller context. 4870 * 4871 * OUT: protp - protection mode of created pages. 4872 * pl - list of pages created. 4873 * 4874 * RETURN: 0 on success, error code on failure. 4875 * 4876 * Timestamps: 4877 * vp - atime updated 4878 */ 4879/* ARGSUSED */ 4880static int 4881zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp, 4882 page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, 4883 enum seg_rw rw, cred_t *cr, caller_context_t *ct) 4884{ 4885 znode_t *zp = VTOZ(vp); 4886 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4887 page_t **pl0 = pl; 4888 int err = 0; 4889 4890 /* we do our own caching, faultahead is unnecessary */ 4891 if (pl == NULL) 4892 return (0); 4893 else if (len > plsz) 4894 len = plsz; 4895 else 4896 len = P2ROUNDUP(len, PAGESIZE); 4897 ASSERT(plsz >= len); 4898 4899 ZFS_ENTER(zfsvfs); 4900 ZFS_VERIFY_ZP(zp); 4901 4902 if (protp) 4903 *protp = PROT_ALL; 4904 4905 /* 4906 * Loop through the requested range [off, off + len) looking 4907 * for pages. If we don't find a page, we will need to create 4908 * a new page and fill it with data from the file. 4909 */ 4910 while (len > 0) { 4911 if (*pl = page_lookup(vp, off, SE_SHARED)) 4912 *(pl+1) = NULL; 4913 else if (err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw)) 4914 goto out; 4915 while (*pl) { 4916 ASSERT3U((*pl)->p_offset, ==, off); 4917 off += PAGESIZE; 4918 addr += PAGESIZE; 4919 if (len > 0) { 4920 ASSERT3U(len, >=, PAGESIZE); 4921 len -= PAGESIZE; 4922 } 4923 ASSERT3U(plsz, >=, PAGESIZE); 4924 plsz -= PAGESIZE; 4925 pl++; 4926 } 4927 } 4928 4929 /* 4930 * Fill out the page array with any pages already in the cache. 4931 */ 4932 while (plsz > 0 && 4933 (*pl++ = page_lookup_nowait(vp, off, SE_SHARED))) { 4934 off += PAGESIZE; 4935 plsz -= PAGESIZE; 4936 } 4937out: 4938 if (err) { 4939 /* 4940 * Release any pages we have previously locked. 4941 */ 4942 while (pl > pl0) 4943 page_unlock(*--pl); 4944 } else { 4945 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 4946 } 4947 4948 *pl = NULL; 4949 4950 ZFS_EXIT(zfsvfs); 4951 return (err); 4952} 4953 4954/* 4955 * Request a memory map for a section of a file. This code interacts 4956 * with common code and the VM system as follows: 4957 * 4958 * - common code calls mmap(), which ends up in smmap_common() 4959 * - this calls VOP_MAP(), which takes you into (say) zfs 4960 * - zfs_map() calls as_map(), passing segvn_create() as the callback 4961 * - segvn_create() creates the new segment and calls VOP_ADDMAP() 4962 * - zfs_addmap() updates z_mapcnt 4963 */ 4964/*ARGSUSED*/ 4965static int 4966zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp, 4967 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, 4968 caller_context_t *ct) 4969{ 4970 znode_t *zp = VTOZ(vp); 4971 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4972 segvn_crargs_t vn_a; 4973 int error; 4974 4975 ZFS_ENTER(zfsvfs); 4976 ZFS_VERIFY_ZP(zp); 4977 4978 if ((prot & PROT_WRITE) && (zp->z_pflags & 4979 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) { 4980 ZFS_EXIT(zfsvfs); 4981 return (SET_ERROR(EPERM)); 4982 } 4983 4984 if ((prot & (PROT_READ | PROT_EXEC)) && 4985 (zp->z_pflags & ZFS_AV_QUARANTINED)) { 4986 ZFS_EXIT(zfsvfs); 4987 return (SET_ERROR(EACCES)); 4988 } 4989 4990 if (vp->v_flag & VNOMAP) { 4991 ZFS_EXIT(zfsvfs); 4992 return (SET_ERROR(ENOSYS)); 4993 } 4994 4995 if (off < 0 || len > MAXOFFSET_T - off) { 4996 ZFS_EXIT(zfsvfs); 4997 return (SET_ERROR(ENXIO)); 4998 } 4999 5000 if (vp->v_type != VREG) { 5001 ZFS_EXIT(zfsvfs); 5002 return (SET_ERROR(ENODEV)); 5003 } 5004 5005 /* 5006 * If file is locked, disallow mapping. 5007 */ 5008 if (MANDMODE(zp->z_mode) && vn_has_flocks(vp)) { 5009 ZFS_EXIT(zfsvfs); 5010 return (SET_ERROR(EAGAIN)); 5011 } 5012 5013 as_rangelock(as); 5014 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags); 5015 if (error != 0) { 5016 as_rangeunlock(as); 5017 ZFS_EXIT(zfsvfs); 5018 return (error); 5019 } 5020 5021 vn_a.vp = vp; 5022 vn_a.offset = (u_offset_t)off; 5023 vn_a.type = flags & MAP_TYPE; 5024 vn_a.prot = prot; 5025 vn_a.maxprot = maxprot; 5026 vn_a.cred = cr; 5027 vn_a.amp = NULL; 5028 vn_a.flags = flags & ~MAP_TYPE; 5029 vn_a.szc = 0; 5030 vn_a.lgrp_mem_policy_flags = 0; 5031 5032 error = as_map(as, *addrp, len, segvn_create, &vn_a); 5033 5034 as_rangeunlock(as); 5035 ZFS_EXIT(zfsvfs); 5036 return (error); 5037} 5038 5039/* ARGSUSED */ 5040static int 5041zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 5042 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, 5043 caller_context_t *ct) 5044{ 5045 uint64_t pages = btopr(len); 5046 5047 atomic_add_64(&VTOZ(vp)->z_mapcnt, pages); 5048 return (0); 5049} 5050 5051/* 5052 * The reason we push dirty pages as part of zfs_delmap() is so that we get a 5053 * more accurate mtime for the associated file. Since we don't have a way of 5054 * detecting when the data was actually modified, we have to resort to 5055 * heuristics. If an explicit msync() is done, then we mark the mtime when the 5056 * last page is pushed. The problem occurs when the msync() call is omitted, 5057 * which by far the most common case: 5058 * 5059 * open() 5060 * mmap() 5061 * <modify memory> 5062 * munmap() 5063 * close() 5064 * <time lapse> 5065 * putpage() via fsflush 5066 * 5067 * If we wait until fsflush to come along, we can have a modification time that 5068 * is some arbitrary point in the future. In order to prevent this in the 5069 * common case, we flush pages whenever a (MAP_SHARED, PROT_WRITE) mapping is 5070 * torn down. 5071 */ 5072/* ARGSUSED */ 5073static int 5074zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 5075 size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr, 5076 caller_context_t *ct) 5077{ 5078 uint64_t pages = btopr(len); 5079 5080 ASSERT3U(VTOZ(vp)->z_mapcnt, >=, pages); 5081 atomic_add_64(&VTOZ(vp)->z_mapcnt, -pages); 5082 5083 if ((flags & MAP_SHARED) && (prot & PROT_WRITE) && 5084 vn_has_cached_data(vp)) 5085 (void) VOP_PUTPAGE(vp, off, len, B_ASYNC, cr, ct); 5086 5087 return (0); 5088} 5089 5090/* 5091 * Free or allocate space in a file. Currently, this function only 5092 * supports the `F_FREESP' command. However, this command is somewhat 5093 * misnamed, as its functionality includes the ability to allocate as 5094 * well as free space. 5095 * 5096 * IN: vp - vnode of file to free data in. 5097 * cmd - action to take (only F_FREESP supported). 5098 * bfp - section of file to free/alloc. 5099 * flag - current file open mode flags. 5100 * offset - current file offset. 5101 * cr - credentials of caller [UNUSED]. 5102 * ct - caller context. 5103 * 5104 * RETURN: 0 on success, error code on failure. 5105 * 5106 * Timestamps: 5107 * vp - ctime|mtime updated 5108 */ 5109/* ARGSUSED */ 5110static int 5111zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag, 5112 offset_t offset, cred_t *cr, caller_context_t *ct) 5113{ 5114 znode_t *zp = VTOZ(vp); 5115 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5116 uint64_t off, len; 5117 int error; 5118 5119 ZFS_ENTER(zfsvfs); 5120 ZFS_VERIFY_ZP(zp); 5121 5122 if (cmd != F_FREESP) { 5123 ZFS_EXIT(zfsvfs); 5124 return (SET_ERROR(EINVAL)); 5125 } 5126 5127 if (error = convoff(vp, bfp, 0, offset)) { 5128 ZFS_EXIT(zfsvfs); 5129 return (error); 5130 } 5131 5132 if (bfp->l_len < 0) { 5133 ZFS_EXIT(zfsvfs); 5134 return (SET_ERROR(EINVAL)); 5135 } 5136 5137 off = bfp->l_start; 5138 len = bfp->l_len; /* 0 means from off to end of file */ 5139 5140 error = zfs_freesp(zp, off, len, flag, TRUE); 5141 5142 ZFS_EXIT(zfsvfs); 5143 return (error); 5144} 5145#endif /* sun */ 5146 5147CTASSERT(sizeof(struct zfid_short) <= sizeof(struct fid)); 5148CTASSERT(sizeof(struct zfid_long) <= sizeof(struct fid)); 5149 5150/*ARGSUSED*/ 5151static int 5152zfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 5153{ 5154 znode_t *zp = VTOZ(vp); 5155 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5156 uint32_t gen; 5157 uint64_t gen64; 5158 uint64_t object = zp->z_id; 5159 zfid_short_t *zfid; 5160 int size, i, error; 5161 5162 ZFS_ENTER(zfsvfs); 5163 ZFS_VERIFY_ZP(zp); 5164 5165 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), 5166 &gen64, sizeof (uint64_t))) != 0) { 5167 ZFS_EXIT(zfsvfs); 5168 return (error); 5169 } 5170 5171 gen = (uint32_t)gen64; 5172 5173 size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN; 5174 5175#ifdef illumos 5176 if (fidp->fid_len < size) { 5177 fidp->fid_len = size; 5178 ZFS_EXIT(zfsvfs); 5179 return (SET_ERROR(ENOSPC)); 5180 } 5181#else 5182 fidp->fid_len = size; 5183#endif 5184 5185 zfid = (zfid_short_t *)fidp; 5186 5187 zfid->zf_len = size; 5188 5189 for (i = 0; i < sizeof (zfid->zf_object); i++) 5190 zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 5191 5192 /* Must have a non-zero generation number to distinguish from .zfs */ 5193 if (gen == 0) 5194 gen = 1; 5195 for (i = 0; i < sizeof (zfid->zf_gen); i++) 5196 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i)); 5197 5198 if (size == LONG_FID_LEN) { 5199 uint64_t objsetid = dmu_objset_id(zfsvfs->z_os); 5200 zfid_long_t *zlfid; 5201 5202 zlfid = (zfid_long_t *)fidp; 5203 5204 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 5205 zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i)); 5206 5207 /* XXX - this should be the generation number for the objset */ 5208 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 5209 zlfid->zf_setgen[i] = 0; 5210 } 5211 5212 ZFS_EXIT(zfsvfs); 5213 return (0); 5214} 5215 5216static int 5217zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, 5218 caller_context_t *ct) 5219{ 5220 znode_t *zp, *xzp; 5221 zfsvfs_t *zfsvfs; 5222 zfs_dirlock_t *dl; 5223 int error; 5224 5225 switch (cmd) { 5226 case _PC_LINK_MAX: 5227 *valp = INT_MAX; 5228 return (0); 5229 5230 case _PC_FILESIZEBITS: 5231 *valp = 64; 5232 return (0); 5233#ifdef sun 5234 case _PC_XATTR_EXISTS: 5235 zp = VTOZ(vp); 5236 zfsvfs = zp->z_zfsvfs; 5237 ZFS_ENTER(zfsvfs); 5238 ZFS_VERIFY_ZP(zp); 5239 *valp = 0; 5240 error = zfs_dirent_lock(&dl, zp, "", &xzp, 5241 ZXATTR | ZEXISTS | ZSHARED, NULL, NULL); 5242 if (error == 0) { 5243 zfs_dirent_unlock(dl); 5244 if (!zfs_dirempty(xzp)) 5245 *valp = 1; 5246 VN_RELE(ZTOV(xzp)); 5247 } else if (error == ENOENT) { 5248 /* 5249 * If there aren't extended attributes, it's the 5250 * same as having zero of them. 5251 */ 5252 error = 0; 5253 } 5254 ZFS_EXIT(zfsvfs); 5255 return (error); 5256 5257 case _PC_SATTR_ENABLED: 5258 case _PC_SATTR_EXISTS: 5259 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) && 5260 (vp->v_type == VREG || vp->v_type == VDIR); 5261 return (0); 5262 5263 case _PC_ACCESS_FILTERING: 5264 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_ACCESS_FILTER) && 5265 vp->v_type == VDIR; 5266 return (0); 5267 5268 case _PC_ACL_ENABLED: 5269 *valp = _ACL_ACE_ENABLED; 5270 return (0); 5271#endif /* sun */ 5272 case _PC_MIN_HOLE_SIZE: 5273 *valp = (int)SPA_MINBLOCKSIZE; 5274 return (0); 5275#ifdef sun 5276 case _PC_TIMESTAMP_RESOLUTION: 5277 /* nanosecond timestamp resolution */ 5278 *valp = 1L; 5279 return (0); 5280#endif /* sun */ 5281 case _PC_ACL_EXTENDED: 5282 *valp = 0; 5283 return (0); 5284 5285 case _PC_ACL_NFS4: 5286 *valp = 1; 5287 return (0); 5288 5289 case _PC_ACL_PATH_MAX: 5290 *valp = ACL_MAX_ENTRIES; 5291 return (0); 5292 5293 default: 5294 return (EOPNOTSUPP); 5295 } 5296} 5297 5298/*ARGSUSED*/ 5299static int 5300zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr, 5301 caller_context_t *ct) 5302{ 5303 znode_t *zp = VTOZ(vp); 5304 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5305 int error; 5306 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 5307 5308 ZFS_ENTER(zfsvfs); 5309 ZFS_VERIFY_ZP(zp); 5310 error = zfs_getacl(zp, vsecp, skipaclchk, cr); 5311 ZFS_EXIT(zfsvfs); 5312 5313 return (error); 5314} 5315 5316/*ARGSUSED*/ 5317int 5318zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr, 5319 caller_context_t *ct) 5320{ 5321 znode_t *zp = VTOZ(vp); 5322 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5323 int error; 5324 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 5325 zilog_t *zilog = zfsvfs->z_log; 5326 5327 ZFS_ENTER(zfsvfs); 5328 ZFS_VERIFY_ZP(zp); 5329 5330 error = zfs_setacl(zp, vsecp, skipaclchk, cr); 5331 5332 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 5333 zil_commit(zilog, 0); 5334 5335 ZFS_EXIT(zfsvfs); 5336 return (error); 5337} 5338 5339#ifdef sun 5340/* 5341 * The smallest read we may consider to loan out an arcbuf. 5342 * This must be a power of 2. 5343 */ 5344int zcr_blksz_min = (1 << 10); /* 1K */ 5345/* 5346 * If set to less than the file block size, allow loaning out of an 5347 * arcbuf for a partial block read. This must be a power of 2. 5348 */ 5349int zcr_blksz_max = (1 << 17); /* 128K */ 5350 5351/*ARGSUSED*/ 5352static int 5353zfs_reqzcbuf(vnode_t *vp, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr, 5354 caller_context_t *ct) 5355{ 5356 znode_t *zp = VTOZ(vp); 5357 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5358 int max_blksz = zfsvfs->z_max_blksz; 5359 uio_t *uio = &xuio->xu_uio; 5360 ssize_t size = uio->uio_resid; 5361 offset_t offset = uio->uio_loffset; 5362 int blksz; 5363 int fullblk, i; 5364 arc_buf_t *abuf; 5365 ssize_t maxsize; 5366 int preamble, postamble; 5367 5368 if (xuio->xu_type != UIOTYPE_ZEROCOPY) 5369 return (SET_ERROR(EINVAL)); 5370 5371 ZFS_ENTER(zfsvfs); 5372 ZFS_VERIFY_ZP(zp); 5373 switch (ioflag) { 5374 case UIO_WRITE: 5375 /* 5376 * Loan out an arc_buf for write if write size is bigger than 5377 * max_blksz, and the file's block size is also max_blksz. 5378 */ 5379 blksz = max_blksz; 5380 if (size < blksz || zp->z_blksz != blksz) { 5381 ZFS_EXIT(zfsvfs); 5382 return (SET_ERROR(EINVAL)); 5383 } 5384 /* 5385 * Caller requests buffers for write before knowing where the 5386 * write offset might be (e.g. NFS TCP write). 5387 */ 5388 if (offset == -1) { 5389 preamble = 0; 5390 } else { 5391 preamble = P2PHASE(offset, blksz); 5392 if (preamble) { 5393 preamble = blksz - preamble; 5394 size -= preamble; 5395 } 5396 } 5397 5398 postamble = P2PHASE(size, blksz); 5399 size -= postamble; 5400 5401 fullblk = size / blksz; 5402 (void) dmu_xuio_init(xuio, 5403 (preamble != 0) + fullblk + (postamble != 0)); 5404 DTRACE_PROBE3(zfs_reqzcbuf_align, int, preamble, 5405 int, postamble, int, 5406 (preamble != 0) + fullblk + (postamble != 0)); 5407 5408 /* 5409 * Have to fix iov base/len for partial buffers. They 5410 * currently represent full arc_buf's. 5411 */ 5412 if (preamble) { 5413 /* data begins in the middle of the arc_buf */ 5414 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5415 blksz); 5416 ASSERT(abuf); 5417 (void) dmu_xuio_add(xuio, abuf, 5418 blksz - preamble, preamble); 5419 } 5420 5421 for (i = 0; i < fullblk; i++) { 5422 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5423 blksz); 5424 ASSERT(abuf); 5425 (void) dmu_xuio_add(xuio, abuf, 0, blksz); 5426 } 5427 5428 if (postamble) { 5429 /* data ends in the middle of the arc_buf */ 5430 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5431 blksz); 5432 ASSERT(abuf); 5433 (void) dmu_xuio_add(xuio, abuf, 0, postamble); 5434 } 5435 break; 5436 case UIO_READ: 5437 /* 5438 * Loan out an arc_buf for read if the read size is larger than 5439 * the current file block size. Block alignment is not 5440 * considered. Partial arc_buf will be loaned out for read. 5441 */ 5442 blksz = zp->z_blksz; 5443 if (blksz < zcr_blksz_min) 5444 blksz = zcr_blksz_min; 5445 if (blksz > zcr_blksz_max) 5446 blksz = zcr_blksz_max; 5447 /* avoid potential complexity of dealing with it */ 5448 if (blksz > max_blksz) { 5449 ZFS_EXIT(zfsvfs); 5450 return (SET_ERROR(EINVAL)); 5451 } 5452 5453 maxsize = zp->z_size - uio->uio_loffset; 5454 if (size > maxsize) 5455 size = maxsize; 5456 5457 if (size < blksz || vn_has_cached_data(vp)) { 5458 ZFS_EXIT(zfsvfs); 5459 return (SET_ERROR(EINVAL)); 5460 } 5461 break; 5462 default: 5463 ZFS_EXIT(zfsvfs); 5464 return (SET_ERROR(EINVAL)); 5465 } 5466 5467 uio->uio_extflg = UIO_XUIO; 5468 XUIO_XUZC_RW(xuio) = ioflag; 5469 ZFS_EXIT(zfsvfs); 5470 return (0); 5471} 5472 5473/*ARGSUSED*/ 5474static int 5475zfs_retzcbuf(vnode_t *vp, xuio_t *xuio, cred_t *cr, caller_context_t *ct) 5476{ 5477 int i; 5478 arc_buf_t *abuf; 5479 int ioflag = XUIO_XUZC_RW(xuio); 5480 5481 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY); 5482 5483 i = dmu_xuio_cnt(xuio); 5484 while (i-- > 0) { 5485 abuf = dmu_xuio_arcbuf(xuio, i); 5486 /* 5487 * if abuf == NULL, it must be a write buffer 5488 * that has been returned in zfs_write(). 5489 */ 5490 if (abuf) 5491 dmu_return_arcbuf(abuf); 5492 ASSERT(abuf || ioflag == UIO_WRITE); 5493 } 5494 5495 dmu_xuio_fini(xuio); 5496 return (0); 5497} 5498 5499/* 5500 * Predeclare these here so that the compiler assumes that 5501 * this is an "old style" function declaration that does 5502 * not include arguments => we won't get type mismatch errors 5503 * in the initializations that follow. 5504 */ 5505static int zfs_inval(); 5506static int zfs_isdir(); 5507 5508static int 5509zfs_inval() 5510{ 5511 return (SET_ERROR(EINVAL)); 5512} 5513 5514static int 5515zfs_isdir() 5516{ 5517 return (SET_ERROR(EISDIR)); 5518} 5519/* 5520 * Directory vnode operations template 5521 */ 5522vnodeops_t *zfs_dvnodeops; 5523const fs_operation_def_t zfs_dvnodeops_template[] = { 5524 VOPNAME_OPEN, { .vop_open = zfs_open }, 5525 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5526 VOPNAME_READ, { .error = zfs_isdir }, 5527 VOPNAME_WRITE, { .error = zfs_isdir }, 5528 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5529 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5530 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5531 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5532 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5533 VOPNAME_CREATE, { .vop_create = zfs_create }, 5534 VOPNAME_REMOVE, { .vop_remove = zfs_remove }, 5535 VOPNAME_LINK, { .vop_link = zfs_link }, 5536 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5537 VOPNAME_MKDIR, { .vop_mkdir = zfs_mkdir }, 5538 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir }, 5539 VOPNAME_READDIR, { .vop_readdir = zfs_readdir }, 5540 VOPNAME_SYMLINK, { .vop_symlink = zfs_symlink }, 5541 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5542 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5543 VOPNAME_FID, { .vop_fid = zfs_fid }, 5544 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5545 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5546 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5547 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5548 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5549 NULL, NULL 5550}; 5551 5552/* 5553 * Regular file vnode operations template 5554 */ 5555vnodeops_t *zfs_fvnodeops; 5556const fs_operation_def_t zfs_fvnodeops_template[] = { 5557 VOPNAME_OPEN, { .vop_open = zfs_open }, 5558 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5559 VOPNAME_READ, { .vop_read = zfs_read }, 5560 VOPNAME_WRITE, { .vop_write = zfs_write }, 5561 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5562 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5563 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5564 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5565 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5566 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5567 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5568 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5569 VOPNAME_FID, { .vop_fid = zfs_fid }, 5570 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5571 VOPNAME_FRLOCK, { .vop_frlock = zfs_frlock }, 5572 VOPNAME_SPACE, { .vop_space = zfs_space }, 5573 VOPNAME_GETPAGE, { .vop_getpage = zfs_getpage }, 5574 VOPNAME_PUTPAGE, { .vop_putpage = zfs_putpage }, 5575 VOPNAME_MAP, { .vop_map = zfs_map }, 5576 VOPNAME_ADDMAP, { .vop_addmap = zfs_addmap }, 5577 VOPNAME_DELMAP, { .vop_delmap = zfs_delmap }, 5578 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5579 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5580 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5581 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5582 VOPNAME_REQZCBUF, { .vop_reqzcbuf = zfs_reqzcbuf }, 5583 VOPNAME_RETZCBUF, { .vop_retzcbuf = zfs_retzcbuf }, 5584 NULL, NULL 5585}; 5586 5587/* 5588 * Symbolic link vnode operations template 5589 */ 5590vnodeops_t *zfs_symvnodeops; 5591const fs_operation_def_t zfs_symvnodeops_template[] = { 5592 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5593 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5594 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5595 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5596 VOPNAME_READLINK, { .vop_readlink = zfs_readlink }, 5597 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5598 VOPNAME_FID, { .vop_fid = zfs_fid }, 5599 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5600 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5601 NULL, NULL 5602}; 5603 5604/* 5605 * special share hidden files vnode operations template 5606 */ 5607vnodeops_t *zfs_sharevnodeops; 5608const fs_operation_def_t zfs_sharevnodeops_template[] = { 5609 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5610 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5611 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5612 VOPNAME_FID, { .vop_fid = zfs_fid }, 5613 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5614 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5615 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5616 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5617 NULL, NULL 5618}; 5619 5620/* 5621 * Extended attribute directory vnode operations template 5622 * 5623 * This template is identical to the directory vnodes 5624 * operation template except for restricted operations: 5625 * VOP_MKDIR() 5626 * VOP_SYMLINK() 5627 * 5628 * Note that there are other restrictions embedded in: 5629 * zfs_create() - restrict type to VREG 5630 * zfs_link() - no links into/out of attribute space 5631 * zfs_rename() - no moves into/out of attribute space 5632 */ 5633vnodeops_t *zfs_xdvnodeops; 5634const fs_operation_def_t zfs_xdvnodeops_template[] = { 5635 VOPNAME_OPEN, { .vop_open = zfs_open }, 5636 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5637 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5638 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5639 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5640 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5641 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5642 VOPNAME_CREATE, { .vop_create = zfs_create }, 5643 VOPNAME_REMOVE, { .vop_remove = zfs_remove }, 5644 VOPNAME_LINK, { .vop_link = zfs_link }, 5645 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5646 VOPNAME_MKDIR, { .error = zfs_inval }, 5647 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir }, 5648 VOPNAME_READDIR, { .vop_readdir = zfs_readdir }, 5649 VOPNAME_SYMLINK, { .error = zfs_inval }, 5650 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5651 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5652 VOPNAME_FID, { .vop_fid = zfs_fid }, 5653 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5654 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5655 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5656 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5657 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5658 NULL, NULL 5659}; 5660 5661/* 5662 * Error vnode operations template 5663 */ 5664vnodeops_t *zfs_evnodeops; 5665const fs_operation_def_t zfs_evnodeops_template[] = { 5666 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5667 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5668 NULL, NULL 5669}; 5670#endif /* sun */ 5671 5672static int 5673ioflags(int ioflags) 5674{ 5675 int flags = 0; 5676 5677 if (ioflags & IO_APPEND) 5678 flags |= FAPPEND; 5679 if (ioflags & IO_NDELAY) 5680 flags |= FNONBLOCK; 5681 if (ioflags & IO_SYNC) 5682 flags |= (FSYNC | FDSYNC | FRSYNC); 5683 5684 return (flags); 5685} 5686 5687static int 5688zfs_getpages(struct vnode *vp, vm_page_t *m, int count, int reqpage) 5689{ 5690 znode_t *zp = VTOZ(vp); 5691 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5692 objset_t *os = zp->z_zfsvfs->z_os; 5693 vm_page_t mfirst, mlast, mreq; 5694 vm_object_t object; 5695 caddr_t va; 5696 struct sf_buf *sf; 5697 off_t startoff, endoff; 5698 int i, error; 5699 vm_pindex_t reqstart, reqend; 5700 int pcount, lsize, reqsize, size; 5701 5702 ZFS_ENTER(zfsvfs); 5703 ZFS_VERIFY_ZP(zp); 5704 5705 pcount = OFF_TO_IDX(round_page(count)); 5706 mreq = m[reqpage]; 5707 object = mreq->object; 5708 error = 0; 5709 5710 KASSERT(vp->v_object == object, ("mismatching object")); 5711 5712 if (pcount > 1 && zp->z_blksz > PAGESIZE) { 5713 startoff = rounddown(IDX_TO_OFF(mreq->pindex), zp->z_blksz); 5714 reqstart = OFF_TO_IDX(round_page(startoff)); 5715 if (reqstart < m[0]->pindex) 5716 reqstart = 0; 5717 else 5718 reqstart = reqstart - m[0]->pindex; 5719 endoff = roundup(IDX_TO_OFF(mreq->pindex) + PAGE_SIZE, 5720 zp->z_blksz); 5721 reqend = OFF_TO_IDX(trunc_page(endoff)) - 1; 5722 if (reqend > m[pcount - 1]->pindex) 5723 reqend = m[pcount - 1]->pindex; 5724 reqsize = reqend - m[reqstart]->pindex + 1; 5725 KASSERT(reqstart <= reqpage && reqpage < reqstart + reqsize, 5726 ("reqpage beyond [reqstart, reqstart + reqsize[ bounds")); 5727 } else { 5728 reqstart = reqpage; 5729 reqsize = 1; 5730 } 5731 mfirst = m[reqstart]; 5732 mlast = m[reqstart + reqsize - 1]; 5733 5734 zfs_vmobject_wlock(object); 5735 5736 for (i = 0; i < reqstart; i++) { 5737 vm_page_lock(m[i]); 5738 vm_page_free(m[i]); 5739 vm_page_unlock(m[i]); 5740 } 5741 for (i = reqstart + reqsize; i < pcount; i++) { 5742 vm_page_lock(m[i]); 5743 vm_page_free(m[i]); 5744 vm_page_unlock(m[i]); 5745 } 5746 5747 if (mreq->valid && reqsize == 1) { 5748 if (mreq->valid != VM_PAGE_BITS_ALL) 5749 vm_page_zero_invalid(mreq, TRUE); 5750 zfs_vmobject_wunlock(object); 5751 ZFS_EXIT(zfsvfs); 5752 return (zfs_vm_pagerret_ok); 5753 } 5754 5755 PCPU_INC(cnt.v_vnodein); 5756 PCPU_ADD(cnt.v_vnodepgsin, reqsize); 5757 5758 if (IDX_TO_OFF(mreq->pindex) >= object->un_pager.vnp.vnp_size) { 5759 for (i = reqstart; i < reqstart + reqsize; i++) { 5760 if (i != reqpage) { 5761 vm_page_lock(m[i]); 5762 vm_page_free(m[i]); 5763 vm_page_unlock(m[i]); 5764 } 5765 } 5766 zfs_vmobject_wunlock(object); 5767 ZFS_EXIT(zfsvfs); 5768 return (zfs_vm_pagerret_bad); 5769 } 5770 5771 lsize = PAGE_SIZE; 5772 if (IDX_TO_OFF(mlast->pindex) + lsize > object->un_pager.vnp.vnp_size) 5773 lsize = object->un_pager.vnp.vnp_size - IDX_TO_OFF(mlast->pindex); 5774 5775 zfs_vmobject_wunlock(object); 5776 5777 for (i = reqstart; i < reqstart + reqsize; i++) { 5778 size = PAGE_SIZE; 5779 if (i == (reqstart + reqsize - 1)) 5780 size = lsize; 5781 va = zfs_map_page(m[i], &sf); 5782 error = dmu_read(os, zp->z_id, IDX_TO_OFF(m[i]->pindex), 5783 size, va, DMU_READ_PREFETCH); 5784 if (size != PAGE_SIZE) 5785 bzero(va + size, PAGE_SIZE - size); 5786 zfs_unmap_page(sf); 5787 if (error != 0) 5788 break; 5789 } 5790 5791 zfs_vmobject_wlock(object); 5792 5793 for (i = reqstart; i < reqstart + reqsize; i++) { 5794 if (!error) 5795 m[i]->valid = VM_PAGE_BITS_ALL; 5796 KASSERT(m[i]->dirty == 0, ("zfs_getpages: page %p is dirty", m[i])); 5797 if (i != reqpage) 5798 vm_page_readahead_finish(m[i]); 5799 } 5800 5801 zfs_vmobject_wunlock(object); 5802 5803 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 5804 ZFS_EXIT(zfsvfs); 5805 return (error ? zfs_vm_pagerret_error : zfs_vm_pagerret_ok); 5806} 5807 5808static int 5809zfs_freebsd_getpages(ap) 5810 struct vop_getpages_args /* { 5811 struct vnode *a_vp; 5812 vm_page_t *a_m; 5813 int a_count; 5814 int a_reqpage; 5815 vm_ooffset_t a_offset; 5816 } */ *ap; 5817{ 5818 5819 return (zfs_getpages(ap->a_vp, ap->a_m, ap->a_count, ap->a_reqpage)); 5820} 5821 5822static int 5823zfs_putpages(struct vnode *vp, vm_page_t *ma, size_t len, int flags, 5824 int *rtvals) 5825{ 5826 znode_t *zp = VTOZ(vp); 5827 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5828 rl_t *rl; 5829 dmu_tx_t *tx; 5830 struct sf_buf *sf; 5831 vm_object_t object; 5832 vm_page_t m; 5833 caddr_t va; 5834 size_t tocopy; 5835 size_t lo_len; 5836 vm_ooffset_t lo_off; 5837 vm_ooffset_t off; 5838 uint_t blksz; 5839 int ncount; 5840 int pcount; 5841 int err; 5842 int i; 5843 5844 ZFS_ENTER(zfsvfs); 5845 ZFS_VERIFY_ZP(zp); 5846 5847 object = vp->v_object; 5848 pcount = btoc(len); 5849 ncount = pcount; 5850 5851 KASSERT(ma[0]->object == object, ("mismatching object")); 5852 KASSERT(len > 0 && (len & PAGE_MASK) == 0, ("unexpected length")); 5853 5854 for (i = 0; i < pcount; i++) 5855 rtvals[i] = zfs_vm_pagerret_error; 5856 5857 off = IDX_TO_OFF(ma[0]->pindex); 5858 blksz = zp->z_blksz; 5859 lo_off = rounddown(off, blksz); 5860 lo_len = roundup(len + (off - lo_off), blksz); 5861 rl = zfs_range_lock(zp, lo_off, lo_len, RL_WRITER); 5862 5863 zfs_vmobject_wlock(object); 5864 if (len + off > object->un_pager.vnp.vnp_size) { 5865 if (object->un_pager.vnp.vnp_size > off) { 5866 int pgoff; 5867 5868 len = object->un_pager.vnp.vnp_size - off; 5869 ncount = btoc(len); 5870 if ((pgoff = (int)len & PAGE_MASK) != 0) { 5871 /* 5872 * If the object is locked and the following 5873 * conditions hold, then the page's dirty 5874 * field cannot be concurrently changed by a 5875 * pmap operation. 5876 */ 5877 m = ma[ncount - 1]; 5878 vm_page_assert_sbusied(m); 5879 KASSERT(!pmap_page_is_write_mapped(m), 5880 ("zfs_putpages: page %p is not read-only", m)); 5881 vm_page_clear_dirty(m, pgoff, PAGE_SIZE - 5882 pgoff); 5883 } 5884 } else { 5885 len = 0; 5886 ncount = 0; 5887 } 5888 if (ncount < pcount) { 5889 for (i = ncount; i < pcount; i++) { 5890 rtvals[i] = zfs_vm_pagerret_bad; 5891 } 5892 } 5893 } 5894 zfs_vmobject_wunlock(object); 5895 5896 if (ncount == 0) 5897 goto out; 5898 5899 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 5900 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 5901 goto out; 5902 } 5903 5904top: 5905 tx = dmu_tx_create(zfsvfs->z_os); 5906 dmu_tx_hold_write(tx, zp->z_id, off, len); 5907 5908 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 5909 zfs_sa_upgrade_txholds(tx, zp); 5910 err = dmu_tx_assign(tx, TXG_NOWAIT); 5911 if (err != 0) { 5912 if (err == ERESTART) { 5913 dmu_tx_wait(tx); 5914 dmu_tx_abort(tx); 5915 goto top; 5916 } 5917 dmu_tx_abort(tx); 5918 goto out; 5919 } 5920 5921 if (zp->z_blksz < PAGE_SIZE) { 5922 i = 0; 5923 for (i = 0; len > 0; off += tocopy, len -= tocopy, i++) { 5924 tocopy = len > PAGE_SIZE ? PAGE_SIZE : len; 5925 va = zfs_map_page(ma[i], &sf); 5926 dmu_write(zfsvfs->z_os, zp->z_id, off, tocopy, va, tx); 5927 zfs_unmap_page(sf); 5928 } 5929 } else { 5930 err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, ma, tx); 5931 } 5932 5933 if (err == 0) { 5934 uint64_t mtime[2], ctime[2]; 5935 sa_bulk_attr_t bulk[3]; 5936 int count = 0; 5937 5938 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 5939 &mtime, 16); 5940 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 5941 &ctime, 16); 5942 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 5943 &zp->z_pflags, 8); 5944 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 5945 B_TRUE); 5946 (void)sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 5947 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0); 5948 5949 zfs_vmobject_wlock(object); 5950 for (i = 0; i < ncount; i++) { 5951 rtvals[i] = zfs_vm_pagerret_ok; 5952 vm_page_undirty(ma[i]); 5953 } 5954 zfs_vmobject_wunlock(object); 5955 PCPU_INC(cnt.v_vnodeout); 5956 PCPU_ADD(cnt.v_vnodepgsout, ncount); 5957 } 5958 dmu_tx_commit(tx); 5959 5960out: 5961 zfs_range_unlock(rl); 5962 if ((flags & (zfs_vm_pagerput_sync | zfs_vm_pagerput_inval)) != 0 || 5963 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 5964 zil_commit(zfsvfs->z_log, zp->z_id); 5965 ZFS_EXIT(zfsvfs); 5966 return (rtvals[0]); 5967} 5968 5969int 5970zfs_freebsd_putpages(ap) 5971 struct vop_putpages_args /* { 5972 struct vnode *a_vp; 5973 vm_page_t *a_m; 5974 int a_count; 5975 int a_sync; 5976 int *a_rtvals; 5977 vm_ooffset_t a_offset; 5978 } */ *ap; 5979{ 5980 5981 return (zfs_putpages(ap->a_vp, ap->a_m, ap->a_count, ap->a_sync, 5982 ap->a_rtvals)); 5983} 5984 5985static int 5986zfs_freebsd_bmap(ap) 5987 struct vop_bmap_args /* { 5988 struct vnode *a_vp; 5989 daddr_t a_bn; 5990 struct bufobj **a_bop; 5991 daddr_t *a_bnp; 5992 int *a_runp; 5993 int *a_runb; 5994 } */ *ap; 5995{ 5996 5997 if (ap->a_bop != NULL) 5998 *ap->a_bop = &ap->a_vp->v_bufobj; 5999 if (ap->a_bnp != NULL) 6000 *ap->a_bnp = ap->a_bn; 6001 if (ap->a_runp != NULL) 6002 *ap->a_runp = 0; 6003 if (ap->a_runb != NULL) 6004 *ap->a_runb = 0; 6005 6006 return (0); 6007} 6008 6009static int 6010zfs_freebsd_open(ap) 6011 struct vop_open_args /* { 6012 struct vnode *a_vp; 6013 int a_mode; 6014 struct ucred *a_cred; 6015 struct thread *a_td; 6016 } */ *ap; 6017{ 6018 vnode_t *vp = ap->a_vp; 6019 znode_t *zp = VTOZ(vp); 6020 int error; 6021 6022 error = zfs_open(&vp, ap->a_mode, ap->a_cred, NULL); 6023 if (error == 0) 6024 vnode_create_vobject(vp, zp->z_size, ap->a_td); 6025 return (error); 6026} 6027 6028static int 6029zfs_freebsd_close(ap) 6030 struct vop_close_args /* { 6031 struct vnode *a_vp; 6032 int a_fflag; 6033 struct ucred *a_cred; 6034 struct thread *a_td; 6035 } */ *ap; 6036{ 6037 6038 return (zfs_close(ap->a_vp, ap->a_fflag, 1, 0, ap->a_cred, NULL)); 6039} 6040 6041static int 6042zfs_freebsd_ioctl(ap) 6043 struct vop_ioctl_args /* { 6044 struct vnode *a_vp; 6045 u_long a_command; 6046 caddr_t a_data; 6047 int a_fflag; 6048 struct ucred *cred; 6049 struct thread *td; 6050 } */ *ap; 6051{ 6052 6053 return (zfs_ioctl(ap->a_vp, ap->a_command, (intptr_t)ap->a_data, 6054 ap->a_fflag, ap->a_cred, NULL, NULL)); 6055} 6056 6057static int 6058zfs_freebsd_read(ap) 6059 struct vop_read_args /* { 6060 struct vnode *a_vp; 6061 struct uio *a_uio; 6062 int a_ioflag; 6063 struct ucred *a_cred; 6064 } */ *ap; 6065{ 6066 6067 return (zfs_read(ap->a_vp, ap->a_uio, ioflags(ap->a_ioflag), 6068 ap->a_cred, NULL)); 6069} 6070 6071static int 6072zfs_freebsd_write(ap) 6073 struct vop_write_args /* { 6074 struct vnode *a_vp; 6075 struct uio *a_uio; 6076 int a_ioflag; 6077 struct ucred *a_cred; 6078 } */ *ap; 6079{ 6080 6081 return (zfs_write(ap->a_vp, ap->a_uio, ioflags(ap->a_ioflag), 6082 ap->a_cred, NULL)); 6083} 6084 6085static int 6086zfs_freebsd_access(ap) 6087 struct vop_access_args /* { 6088 struct vnode *a_vp; 6089 accmode_t a_accmode; 6090 struct ucred *a_cred; 6091 struct thread *a_td; 6092 } */ *ap; 6093{ 6094 vnode_t *vp = ap->a_vp; 6095 znode_t *zp = VTOZ(vp); 6096 accmode_t accmode; 6097 int error = 0; 6098 6099 /* 6100 * ZFS itself only knowns about VREAD, VWRITE, VEXEC and VAPPEND, 6101 */ 6102 accmode = ap->a_accmode & (VREAD|VWRITE|VEXEC|VAPPEND); 6103 if (accmode != 0) 6104 error = zfs_access(ap->a_vp, accmode, 0, ap->a_cred, NULL); 6105 6106 /* 6107 * VADMIN has to be handled by vaccess(). 6108 */ 6109 if (error == 0) { 6110 accmode = ap->a_accmode & ~(VREAD|VWRITE|VEXEC|VAPPEND); 6111 if (accmode != 0) { 6112 error = vaccess(vp->v_type, zp->z_mode, zp->z_uid, 6113 zp->z_gid, accmode, ap->a_cred, NULL); 6114 } 6115 } 6116 6117 /* 6118 * For VEXEC, ensure that at least one execute bit is set for 6119 * non-directories. 6120 */ 6121 if (error == 0 && (ap->a_accmode & VEXEC) != 0 && vp->v_type != VDIR && 6122 (zp->z_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) { 6123 error = EACCES; 6124 } 6125 6126 return (error); 6127} 6128 6129static int 6130zfs_freebsd_lookup(ap) 6131 struct vop_lookup_args /* { 6132 struct vnode *a_dvp; 6133 struct vnode **a_vpp; 6134 struct componentname *a_cnp; 6135 } */ *ap; 6136{ 6137 struct componentname *cnp = ap->a_cnp; 6138 char nm[NAME_MAX + 1]; 6139 6140 ASSERT(cnp->cn_namelen < sizeof(nm)); 6141 strlcpy(nm, cnp->cn_nameptr, MIN(cnp->cn_namelen + 1, sizeof(nm))); 6142 6143 return (zfs_lookup(ap->a_dvp, nm, ap->a_vpp, cnp, cnp->cn_nameiop, 6144 cnp->cn_cred, cnp->cn_thread, 0)); 6145} 6146 6147static int 6148zfs_freebsd_create(ap) 6149 struct vop_create_args /* { 6150 struct vnode *a_dvp; 6151 struct vnode **a_vpp; 6152 struct componentname *a_cnp; 6153 struct vattr *a_vap; 6154 } */ *ap; 6155{ 6156 struct componentname *cnp = ap->a_cnp; 6157 vattr_t *vap = ap->a_vap; 6158 int mode; 6159 6160 ASSERT(cnp->cn_flags & SAVENAME); 6161 6162 vattr_init_mask(vap); 6163 mode = vap->va_mode & ALLPERMS; 6164 6165 return (zfs_create(ap->a_dvp, cnp->cn_nameptr, vap, !EXCL, mode, 6166 ap->a_vpp, cnp->cn_cred, cnp->cn_thread)); 6167} 6168 6169static int 6170zfs_freebsd_remove(ap) 6171 struct vop_remove_args /* { 6172 struct vnode *a_dvp; 6173 struct vnode *a_vp; 6174 struct componentname *a_cnp; 6175 } */ *ap; 6176{ 6177 6178 ASSERT(ap->a_cnp->cn_flags & SAVENAME); 6179 6180 return (zfs_remove(ap->a_dvp, ap->a_cnp->cn_nameptr, 6181 ap->a_cnp->cn_cred, NULL, 0)); 6182} 6183 6184static int 6185zfs_freebsd_mkdir(ap) 6186 struct vop_mkdir_args /* { 6187 struct vnode *a_dvp; 6188 struct vnode **a_vpp; 6189 struct componentname *a_cnp; 6190 struct vattr *a_vap; 6191 } */ *ap; 6192{ 6193 vattr_t *vap = ap->a_vap; 6194 6195 ASSERT(ap->a_cnp->cn_flags & SAVENAME); 6196 6197 vattr_init_mask(vap); 6198 6199 return (zfs_mkdir(ap->a_dvp, ap->a_cnp->cn_nameptr, vap, ap->a_vpp, 6200 ap->a_cnp->cn_cred, NULL, 0, NULL)); 6201} 6202 6203static int 6204zfs_freebsd_rmdir(ap) 6205 struct vop_rmdir_args /* { 6206 struct vnode *a_dvp; 6207 struct vnode *a_vp; 6208 struct componentname *a_cnp; 6209 } */ *ap; 6210{ 6211 struct componentname *cnp = ap->a_cnp; 6212 6213 ASSERT(cnp->cn_flags & SAVENAME); 6214 6215 return (zfs_rmdir(ap->a_dvp, cnp->cn_nameptr, NULL, cnp->cn_cred, NULL, 0)); 6216} 6217 6218static int 6219zfs_freebsd_readdir(ap) 6220 struct vop_readdir_args /* { 6221 struct vnode *a_vp; 6222 struct uio *a_uio; 6223 struct ucred *a_cred; 6224 int *a_eofflag; 6225 int *a_ncookies; 6226 u_long **a_cookies; 6227 } */ *ap; 6228{ 6229 6230 return (zfs_readdir(ap->a_vp, ap->a_uio, ap->a_cred, ap->a_eofflag, 6231 ap->a_ncookies, ap->a_cookies)); 6232} 6233 6234static int 6235zfs_freebsd_fsync(ap) 6236 struct vop_fsync_args /* { 6237 struct vnode *a_vp; 6238 int a_waitfor; 6239 struct thread *a_td; 6240 } */ *ap; 6241{ 6242 6243 vop_stdfsync(ap); 6244 return (zfs_fsync(ap->a_vp, 0, ap->a_td->td_ucred, NULL)); 6245} 6246 6247static int 6248zfs_freebsd_getattr(ap) 6249 struct vop_getattr_args /* { 6250 struct vnode *a_vp; 6251 struct vattr *a_vap; 6252 struct ucred *a_cred; 6253 } */ *ap; 6254{ 6255 vattr_t *vap = ap->a_vap; 6256 xvattr_t xvap; 6257 u_long fflags = 0; 6258 int error; 6259 6260 xva_init(&xvap); 6261 xvap.xva_vattr = *vap; 6262 xvap.xva_vattr.va_mask |= AT_XVATTR; 6263 6264 /* Convert chflags into ZFS-type flags. */ 6265 /* XXX: what about SF_SETTABLE?. */ 6266 XVA_SET_REQ(&xvap, XAT_IMMUTABLE); 6267 XVA_SET_REQ(&xvap, XAT_APPENDONLY); 6268 XVA_SET_REQ(&xvap, XAT_NOUNLINK); 6269 XVA_SET_REQ(&xvap, XAT_NODUMP); 6270 XVA_SET_REQ(&xvap, XAT_READONLY); 6271 XVA_SET_REQ(&xvap, XAT_ARCHIVE); 6272 XVA_SET_REQ(&xvap, XAT_SYSTEM); 6273 XVA_SET_REQ(&xvap, XAT_HIDDEN); 6274 XVA_SET_REQ(&xvap, XAT_REPARSE); 6275 XVA_SET_REQ(&xvap, XAT_OFFLINE); 6276 XVA_SET_REQ(&xvap, XAT_SPARSE); 6277 6278 error = zfs_getattr(ap->a_vp, (vattr_t *)&xvap, 0, ap->a_cred, NULL); 6279 if (error != 0) 6280 return (error); 6281 6282 /* Convert ZFS xattr into chflags. */ 6283#define FLAG_CHECK(fflag, xflag, xfield) do { \ 6284 if (XVA_ISSET_RTN(&xvap, (xflag)) && (xfield) != 0) \ 6285 fflags |= (fflag); \ 6286} while (0) 6287 FLAG_CHECK(SF_IMMUTABLE, XAT_IMMUTABLE, 6288 xvap.xva_xoptattrs.xoa_immutable); 6289 FLAG_CHECK(SF_APPEND, XAT_APPENDONLY, 6290 xvap.xva_xoptattrs.xoa_appendonly); 6291 FLAG_CHECK(SF_NOUNLINK, XAT_NOUNLINK, 6292 xvap.xva_xoptattrs.xoa_nounlink); 6293 FLAG_CHECK(UF_ARCHIVE, XAT_ARCHIVE, 6294 xvap.xva_xoptattrs.xoa_archive); 6295 FLAG_CHECK(UF_NODUMP, XAT_NODUMP, 6296 xvap.xva_xoptattrs.xoa_nodump); 6297 FLAG_CHECK(UF_READONLY, XAT_READONLY, 6298 xvap.xva_xoptattrs.xoa_readonly); 6299 FLAG_CHECK(UF_SYSTEM, XAT_SYSTEM, 6300 xvap.xva_xoptattrs.xoa_system); 6301 FLAG_CHECK(UF_HIDDEN, XAT_HIDDEN, 6302 xvap.xva_xoptattrs.xoa_hidden); 6303 FLAG_CHECK(UF_REPARSE, XAT_REPARSE, 6304 xvap.xva_xoptattrs.xoa_reparse); 6305 FLAG_CHECK(UF_OFFLINE, XAT_OFFLINE, 6306 xvap.xva_xoptattrs.xoa_offline); 6307 FLAG_CHECK(UF_SPARSE, XAT_SPARSE, 6308 xvap.xva_xoptattrs.xoa_sparse); 6309 6310#undef FLAG_CHECK 6311 *vap = xvap.xva_vattr; 6312 vap->va_flags = fflags; 6313 return (0); 6314} 6315 6316static int 6317zfs_freebsd_setattr(ap) 6318 struct vop_setattr_args /* { 6319 struct vnode *a_vp; 6320 struct vattr *a_vap; 6321 struct ucred *a_cred; 6322 } */ *ap; 6323{ 6324 vnode_t *vp = ap->a_vp; 6325 vattr_t *vap = ap->a_vap; 6326 cred_t *cred = ap->a_cred; 6327 xvattr_t xvap; 6328 u_long fflags; 6329 uint64_t zflags; 6330 6331 vattr_init_mask(vap); 6332 vap->va_mask &= ~AT_NOSET; 6333 6334 xva_init(&xvap); 6335 xvap.xva_vattr = *vap; 6336 6337 zflags = VTOZ(vp)->z_pflags; 6338 6339 if (vap->va_flags != VNOVAL) { 6340 zfsvfs_t *zfsvfs = VTOZ(vp)->z_zfsvfs; 6341 int error; 6342 6343 if (zfsvfs->z_use_fuids == B_FALSE) 6344 return (EOPNOTSUPP); 6345 6346 fflags = vap->va_flags; 6347 /* 6348 * XXX KDM 6349 * We need to figure out whether it makes sense to allow 6350 * UF_REPARSE through, since we don't really have other 6351 * facilities to handle reparse points and zfs_setattr() 6352 * doesn't currently allow setting that attribute anyway. 6353 */ 6354 if ((fflags & ~(SF_IMMUTABLE|SF_APPEND|SF_NOUNLINK|UF_ARCHIVE| 6355 UF_NODUMP|UF_SYSTEM|UF_HIDDEN|UF_READONLY|UF_REPARSE| 6356 UF_OFFLINE|UF_SPARSE)) != 0) 6357 return (EOPNOTSUPP); 6358 /* 6359 * Unprivileged processes are not permitted to unset system 6360 * flags, or modify flags if any system flags are set. 6361 * Privileged non-jail processes may not modify system flags 6362 * if securelevel > 0 and any existing system flags are set. 6363 * Privileged jail processes behave like privileged non-jail 6364 * processes if the security.jail.chflags_allowed sysctl is 6365 * is non-zero; otherwise, they behave like unprivileged 6366 * processes. 6367 */ 6368 if (secpolicy_fs_owner(vp->v_mount, cred) == 0 || 6369 priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0) == 0) { 6370 if (zflags & 6371 (ZFS_IMMUTABLE | ZFS_APPENDONLY | ZFS_NOUNLINK)) { 6372 error = securelevel_gt(cred, 0); 6373 if (error != 0) 6374 return (error); 6375 } 6376 } else { 6377 /* 6378 * Callers may only modify the file flags on objects they 6379 * have VADMIN rights for. 6380 */ 6381 if ((error = VOP_ACCESS(vp, VADMIN, cred, curthread)) != 0) 6382 return (error); 6383 if (zflags & 6384 (ZFS_IMMUTABLE | ZFS_APPENDONLY | ZFS_NOUNLINK)) { 6385 return (EPERM); 6386 } 6387 if (fflags & 6388 (SF_IMMUTABLE | SF_APPEND | SF_NOUNLINK)) { 6389 return (EPERM); 6390 } 6391 } 6392 6393#define FLAG_CHANGE(fflag, zflag, xflag, xfield) do { \ 6394 if (((fflags & (fflag)) && !(zflags & (zflag))) || \ 6395 ((zflags & (zflag)) && !(fflags & (fflag)))) { \ 6396 XVA_SET_REQ(&xvap, (xflag)); \ 6397 (xfield) = ((fflags & (fflag)) != 0); \ 6398 } \ 6399} while (0) 6400 /* Convert chflags into ZFS-type flags. */ 6401 /* XXX: what about SF_SETTABLE?. */ 6402 FLAG_CHANGE(SF_IMMUTABLE, ZFS_IMMUTABLE, XAT_IMMUTABLE, 6403 xvap.xva_xoptattrs.xoa_immutable); 6404 FLAG_CHANGE(SF_APPEND, ZFS_APPENDONLY, XAT_APPENDONLY, 6405 xvap.xva_xoptattrs.xoa_appendonly); 6406 FLAG_CHANGE(SF_NOUNLINK, ZFS_NOUNLINK, XAT_NOUNLINK, 6407 xvap.xva_xoptattrs.xoa_nounlink); 6408 FLAG_CHANGE(UF_ARCHIVE, ZFS_ARCHIVE, XAT_ARCHIVE, 6409 xvap.xva_xoptattrs.xoa_archive); 6410 FLAG_CHANGE(UF_NODUMP, ZFS_NODUMP, XAT_NODUMP, 6411 xvap.xva_xoptattrs.xoa_nodump); 6412 FLAG_CHANGE(UF_READONLY, ZFS_READONLY, XAT_READONLY, 6413 xvap.xva_xoptattrs.xoa_readonly); 6414 FLAG_CHANGE(UF_SYSTEM, ZFS_SYSTEM, XAT_SYSTEM, 6415 xvap.xva_xoptattrs.xoa_system); 6416 FLAG_CHANGE(UF_HIDDEN, ZFS_HIDDEN, XAT_HIDDEN, 6417 xvap.xva_xoptattrs.xoa_hidden); 6418 FLAG_CHANGE(UF_REPARSE, ZFS_REPARSE, XAT_REPARSE, 6419 xvap.xva_xoptattrs.xoa_hidden); 6420 FLAG_CHANGE(UF_OFFLINE, ZFS_OFFLINE, XAT_OFFLINE, 6421 xvap.xva_xoptattrs.xoa_offline); 6422 FLAG_CHANGE(UF_SPARSE, ZFS_SPARSE, XAT_SPARSE, 6423 xvap.xva_xoptattrs.xoa_sparse); 6424#undef FLAG_CHANGE 6425 } 6426 return (zfs_setattr(vp, (vattr_t *)&xvap, 0, cred, NULL)); 6427} 6428 6429static int 6430zfs_freebsd_rename(ap) 6431 struct vop_rename_args /* { 6432 struct vnode *a_fdvp; 6433 struct vnode *a_fvp; 6434 struct componentname *a_fcnp; 6435 struct vnode *a_tdvp; 6436 struct vnode *a_tvp; 6437 struct componentname *a_tcnp; 6438 } */ *ap; 6439{ 6440 vnode_t *fdvp = ap->a_fdvp; 6441 vnode_t *fvp = ap->a_fvp; 6442 vnode_t *tdvp = ap->a_tdvp; 6443 vnode_t *tvp = ap->a_tvp; 6444 int error; 6445 6446 ASSERT(ap->a_fcnp->cn_flags & (SAVENAME|SAVESTART)); 6447 ASSERT(ap->a_tcnp->cn_flags & (SAVENAME|SAVESTART)); 6448 6449 /* 6450 * Check for cross-device rename. 6451 */ 6452 if ((fdvp->v_mount != tdvp->v_mount) || 6453 (tvp && (fdvp->v_mount != tvp->v_mount))) 6454 error = EXDEV; 6455 else 6456 error = zfs_rename(fdvp, ap->a_fcnp->cn_nameptr, tdvp, 6457 ap->a_tcnp->cn_nameptr, ap->a_fcnp->cn_cred, NULL, 0); 6458 if (tdvp == tvp) 6459 VN_RELE(tdvp); 6460 else 6461 VN_URELE(tdvp); 6462 if (tvp) 6463 VN_URELE(tvp); 6464 VN_RELE(fdvp); 6465 VN_RELE(fvp); 6466 6467 return (error); 6468} 6469 6470static int 6471zfs_freebsd_symlink(ap) 6472 struct vop_symlink_args /* { 6473 struct vnode *a_dvp; 6474 struct vnode **a_vpp; 6475 struct componentname *a_cnp; 6476 struct vattr *a_vap; 6477 char *a_target; 6478 } */ *ap; 6479{ 6480 struct componentname *cnp = ap->a_cnp; 6481 vattr_t *vap = ap->a_vap; 6482 6483 ASSERT(cnp->cn_flags & SAVENAME); 6484 6485 vap->va_type = VLNK; /* FreeBSD: Syscall only sets va_mode. */ 6486 vattr_init_mask(vap); 6487 6488 return (zfs_symlink(ap->a_dvp, ap->a_vpp, cnp->cn_nameptr, vap, 6489 ap->a_target, cnp->cn_cred, cnp->cn_thread)); 6490} 6491 6492static int 6493zfs_freebsd_readlink(ap) 6494 struct vop_readlink_args /* { 6495 struct vnode *a_vp; 6496 struct uio *a_uio; 6497 struct ucred *a_cred; 6498 } */ *ap; 6499{ 6500 6501 return (zfs_readlink(ap->a_vp, ap->a_uio, ap->a_cred, NULL)); 6502} 6503 6504static int 6505zfs_freebsd_link(ap) 6506 struct vop_link_args /* { 6507 struct vnode *a_tdvp; 6508 struct vnode *a_vp; 6509 struct componentname *a_cnp; 6510 } */ *ap; 6511{ 6512 struct componentname *cnp = ap->a_cnp; 6513 vnode_t *vp = ap->a_vp; 6514 vnode_t *tdvp = ap->a_tdvp; 6515 6516 if (tdvp->v_mount != vp->v_mount) 6517 return (EXDEV); 6518 6519 ASSERT(cnp->cn_flags & SAVENAME); 6520 6521 return (zfs_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_cred, NULL, 0)); 6522} 6523 6524static int 6525zfs_freebsd_inactive(ap) 6526 struct vop_inactive_args /* { 6527 struct vnode *a_vp; 6528 struct thread *a_td; 6529 } */ *ap; 6530{ 6531 vnode_t *vp = ap->a_vp; 6532 6533 zfs_inactive(vp, ap->a_td->td_ucred, NULL); 6534 return (0); 6535} 6536 6537static int 6538zfs_freebsd_reclaim(ap) 6539 struct vop_reclaim_args /* { 6540 struct vnode *a_vp; 6541 struct thread *a_td; 6542 } */ *ap; 6543{ 6544 vnode_t *vp = ap->a_vp; 6545 znode_t *zp = VTOZ(vp); 6546 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 6547 6548 ASSERT(zp != NULL); 6549 6550 /* Destroy the vm object and flush associated pages. */ 6551 vnode_destroy_vobject(vp); 6552 6553 /* 6554 * z_teardown_inactive_lock protects from a race with 6555 * zfs_znode_dmu_fini in zfsvfs_teardown during 6556 * force unmount. 6557 */ 6558 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER); 6559 if (zp->z_sa_hdl == NULL) 6560 zfs_znode_free(zp); 6561 else 6562 zfs_zinactive(zp); 6563 rw_exit(&zfsvfs->z_teardown_inactive_lock); 6564 6565 vp->v_data = NULL; 6566 return (0); 6567} 6568 6569static int 6570zfs_freebsd_fid(ap) 6571 struct vop_fid_args /* { 6572 struct vnode *a_vp; 6573 struct fid *a_fid; 6574 } */ *ap; 6575{ 6576 6577 return (zfs_fid(ap->a_vp, (void *)ap->a_fid, NULL)); 6578} 6579 6580static int 6581zfs_freebsd_pathconf(ap) 6582 struct vop_pathconf_args /* { 6583 struct vnode *a_vp; 6584 int a_name; 6585 register_t *a_retval; 6586 } */ *ap; 6587{ 6588 ulong_t val; 6589 int error; 6590 6591 error = zfs_pathconf(ap->a_vp, ap->a_name, &val, curthread->td_ucred, NULL); 6592 if (error == 0) 6593 *ap->a_retval = val; 6594 else if (error == EOPNOTSUPP) 6595 error = vop_stdpathconf(ap); 6596 return (error); 6597} 6598 6599static int 6600zfs_freebsd_fifo_pathconf(ap) 6601 struct vop_pathconf_args /* { 6602 struct vnode *a_vp; 6603 int a_name; 6604 register_t *a_retval; 6605 } */ *ap; 6606{ 6607 6608 switch (ap->a_name) { 6609 case _PC_ACL_EXTENDED: 6610 case _PC_ACL_NFS4: 6611 case _PC_ACL_PATH_MAX: 6612 case _PC_MAC_PRESENT: 6613 return (zfs_freebsd_pathconf(ap)); 6614 default: 6615 return (fifo_specops.vop_pathconf(ap)); 6616 } 6617} 6618 6619/* 6620 * FreeBSD's extended attributes namespace defines file name prefix for ZFS' 6621 * extended attribute name: 6622 * 6623 * NAMESPACE PREFIX 6624 * system freebsd:system: 6625 * user (none, can be used to access ZFS fsattr(5) attributes 6626 * created on Solaris) 6627 */ 6628static int 6629zfs_create_attrname(int attrnamespace, const char *name, char *attrname, 6630 size_t size) 6631{ 6632 const char *namespace, *prefix, *suffix; 6633 6634 /* We don't allow '/' character in attribute name. */ 6635 if (strchr(name, '/') != NULL) 6636 return (EINVAL); 6637 /* We don't allow attribute names that start with "freebsd:" string. */ 6638 if (strncmp(name, "freebsd:", 8) == 0) 6639 return (EINVAL); 6640 6641 bzero(attrname, size); 6642 6643 switch (attrnamespace) { 6644 case EXTATTR_NAMESPACE_USER: 6645#if 0 6646 prefix = "freebsd:"; 6647 namespace = EXTATTR_NAMESPACE_USER_STRING; 6648 suffix = ":"; 6649#else 6650 /* 6651 * This is the default namespace by which we can access all 6652 * attributes created on Solaris. 6653 */ 6654 prefix = namespace = suffix = ""; 6655#endif 6656 break; 6657 case EXTATTR_NAMESPACE_SYSTEM: 6658 prefix = "freebsd:"; 6659 namespace = EXTATTR_NAMESPACE_SYSTEM_STRING; 6660 suffix = ":"; 6661 break; 6662 case EXTATTR_NAMESPACE_EMPTY: 6663 default: 6664 return (EINVAL); 6665 } 6666 if (snprintf(attrname, size, "%s%s%s%s", prefix, namespace, suffix, 6667 name) >= size) { 6668 return (ENAMETOOLONG); 6669 } 6670 return (0); 6671} 6672 6673/* 6674 * Vnode operating to retrieve a named extended attribute. 6675 */ 6676static int 6677zfs_getextattr(struct vop_getextattr_args *ap) 6678/* 6679vop_getextattr { 6680 IN struct vnode *a_vp; 6681 IN int a_attrnamespace; 6682 IN const char *a_name; 6683 INOUT struct uio *a_uio; 6684 OUT size_t *a_size; 6685 IN struct ucred *a_cred; 6686 IN struct thread *a_td; 6687}; 6688*/ 6689{ 6690 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6691 struct thread *td = ap->a_td; 6692 struct nameidata nd; 6693 char attrname[255]; 6694 struct vattr va; 6695 vnode_t *xvp = NULL, *vp; 6696 int error, flags; 6697 6698 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6699 ap->a_cred, ap->a_td, VREAD); 6700 if (error != 0) 6701 return (error); 6702 6703 error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, 6704 sizeof(attrname)); 6705 if (error != 0) 6706 return (error); 6707 6708 ZFS_ENTER(zfsvfs); 6709 6710 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6711 LOOKUP_XATTR); 6712 if (error != 0) { 6713 ZFS_EXIT(zfsvfs); 6714 return (error); 6715 } 6716 6717 flags = FREAD; 6718 NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, attrname, 6719 xvp, td); 6720 error = vn_open_cred(&nd, &flags, 0, 0, ap->a_cred, NULL); 6721 vp = nd.ni_vp; 6722 NDFREE(&nd, NDF_ONLY_PNBUF); 6723 if (error != 0) { 6724 ZFS_EXIT(zfsvfs); 6725 if (error == ENOENT) 6726 error = ENOATTR; 6727 return (error); 6728 } 6729 6730 if (ap->a_size != NULL) { 6731 error = VOP_GETATTR(vp, &va, ap->a_cred); 6732 if (error == 0) 6733 *ap->a_size = (size_t)va.va_size; 6734 } else if (ap->a_uio != NULL) 6735 error = VOP_READ(vp, ap->a_uio, IO_UNIT, ap->a_cred); 6736 6737 VOP_UNLOCK(vp, 0); 6738 vn_close(vp, flags, ap->a_cred, td); 6739 ZFS_EXIT(zfsvfs); 6740 6741 return (error); 6742} 6743 6744/* 6745 * Vnode operation to remove a named attribute. 6746 */ 6747int 6748zfs_deleteextattr(struct vop_deleteextattr_args *ap) 6749/* 6750vop_deleteextattr { 6751 IN struct vnode *a_vp; 6752 IN int a_attrnamespace; 6753 IN const char *a_name; 6754 IN struct ucred *a_cred; 6755 IN struct thread *a_td; 6756}; 6757*/ 6758{ 6759 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6760 struct thread *td = ap->a_td; 6761 struct nameidata nd; 6762 char attrname[255]; 6763 struct vattr va; 6764 vnode_t *xvp = NULL, *vp; 6765 int error, flags; 6766 6767 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6768 ap->a_cred, ap->a_td, VWRITE); 6769 if (error != 0) 6770 return (error); 6771 6772 error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, 6773 sizeof(attrname)); 6774 if (error != 0) 6775 return (error); 6776 6777 ZFS_ENTER(zfsvfs); 6778 6779 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6780 LOOKUP_XATTR); 6781 if (error != 0) { 6782 ZFS_EXIT(zfsvfs); 6783 return (error); 6784 } 6785 6786 NDINIT_ATVP(&nd, DELETE, NOFOLLOW | LOCKPARENT | LOCKLEAF, 6787 UIO_SYSSPACE, attrname, xvp, td); 6788 error = namei(&nd); 6789 vp = nd.ni_vp; 6790 if (error != 0) { 6791 ZFS_EXIT(zfsvfs); 6792 NDFREE(&nd, NDF_ONLY_PNBUF); 6793 if (error == ENOENT) 6794 error = ENOATTR; 6795 return (error); 6796 } 6797 6798 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 6799 NDFREE(&nd, NDF_ONLY_PNBUF); 6800 6801 vput(nd.ni_dvp); 6802 if (vp == nd.ni_dvp) 6803 vrele(vp); 6804 else 6805 vput(vp); 6806 ZFS_EXIT(zfsvfs); 6807 6808 return (error); 6809} 6810 6811/* 6812 * Vnode operation to set a named attribute. 6813 */ 6814static int 6815zfs_setextattr(struct vop_setextattr_args *ap) 6816/* 6817vop_setextattr { 6818 IN struct vnode *a_vp; 6819 IN int a_attrnamespace; 6820 IN const char *a_name; 6821 INOUT struct uio *a_uio; 6822 IN struct ucred *a_cred; 6823 IN struct thread *a_td; 6824}; 6825*/ 6826{ 6827 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6828 struct thread *td = ap->a_td; 6829 struct nameidata nd; 6830 char attrname[255]; 6831 struct vattr va; 6832 vnode_t *xvp = NULL, *vp; 6833 int error, flags; 6834 6835 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6836 ap->a_cred, ap->a_td, VWRITE); 6837 if (error != 0) 6838 return (error); 6839 6840 error = zfs_create_attrname(ap->a_attrnamespace, ap->a_name, attrname, 6841 sizeof(attrname)); 6842 if (error != 0) 6843 return (error); 6844 6845 ZFS_ENTER(zfsvfs); 6846 6847 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6848 LOOKUP_XATTR | CREATE_XATTR_DIR); 6849 if (error != 0) { 6850 ZFS_EXIT(zfsvfs); 6851 return (error); 6852 } 6853 6854 flags = FFLAGS(O_WRONLY | O_CREAT); 6855 NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, attrname, 6856 xvp, td); 6857 error = vn_open_cred(&nd, &flags, 0600, 0, ap->a_cred, NULL); 6858 vp = nd.ni_vp; 6859 NDFREE(&nd, NDF_ONLY_PNBUF); 6860 if (error != 0) { 6861 ZFS_EXIT(zfsvfs); 6862 return (error); 6863 } 6864 6865 VATTR_NULL(&va); 6866 va.va_size = 0; 6867 error = VOP_SETATTR(vp, &va, ap->a_cred); 6868 if (error == 0) 6869 VOP_WRITE(vp, ap->a_uio, IO_UNIT, ap->a_cred); 6870 6871 VOP_UNLOCK(vp, 0); 6872 vn_close(vp, flags, ap->a_cred, td); 6873 ZFS_EXIT(zfsvfs); 6874 6875 return (error); 6876} 6877 6878/* 6879 * Vnode operation to retrieve extended attributes on a vnode. 6880 */ 6881static int 6882zfs_listextattr(struct vop_listextattr_args *ap) 6883/* 6884vop_listextattr { 6885 IN struct vnode *a_vp; 6886 IN int a_attrnamespace; 6887 INOUT struct uio *a_uio; 6888 OUT size_t *a_size; 6889 IN struct ucred *a_cred; 6890 IN struct thread *a_td; 6891}; 6892*/ 6893{ 6894 zfsvfs_t *zfsvfs = VTOZ(ap->a_vp)->z_zfsvfs; 6895 struct thread *td = ap->a_td; 6896 struct nameidata nd; 6897 char attrprefix[16]; 6898 u_char dirbuf[sizeof(struct dirent)]; 6899 struct dirent *dp; 6900 struct iovec aiov; 6901 struct uio auio, *uio = ap->a_uio; 6902 size_t *sizep = ap->a_size; 6903 size_t plen; 6904 vnode_t *xvp = NULL, *vp; 6905 int done, error, eof, pos; 6906 6907 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace, 6908 ap->a_cred, ap->a_td, VREAD); 6909 if (error != 0) 6910 return (error); 6911 6912 error = zfs_create_attrname(ap->a_attrnamespace, "", attrprefix, 6913 sizeof(attrprefix)); 6914 if (error != 0) 6915 return (error); 6916 plen = strlen(attrprefix); 6917 6918 ZFS_ENTER(zfsvfs); 6919 6920 if (sizep != NULL) 6921 *sizep = 0; 6922 6923 error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td, 6924 LOOKUP_XATTR); 6925 if (error != 0) { 6926 ZFS_EXIT(zfsvfs); 6927 /* 6928 * ENOATTR means that the EA directory does not yet exist, 6929 * i.e. there are no extended attributes there. 6930 */ 6931 if (error == ENOATTR) 6932 error = 0; 6933 return (error); 6934 } 6935 6936 NDINIT_ATVP(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKSHARED, 6937 UIO_SYSSPACE, ".", xvp, td); 6938 error = namei(&nd); 6939 vp = nd.ni_vp; 6940 NDFREE(&nd, NDF_ONLY_PNBUF); 6941 if (error != 0) { 6942 ZFS_EXIT(zfsvfs); 6943 return (error); 6944 } 6945 6946 auio.uio_iov = &aiov; 6947 auio.uio_iovcnt = 1; 6948 auio.uio_segflg = UIO_SYSSPACE; 6949 auio.uio_td = td; 6950 auio.uio_rw = UIO_READ; 6951 auio.uio_offset = 0; 6952 6953 do { 6954 u_char nlen; 6955 6956 aiov.iov_base = (void *)dirbuf; 6957 aiov.iov_len = sizeof(dirbuf); 6958 auio.uio_resid = sizeof(dirbuf); 6959 error = VOP_READDIR(vp, &auio, ap->a_cred, &eof, NULL, NULL); 6960 done = sizeof(dirbuf) - auio.uio_resid; 6961 if (error != 0) 6962 break; 6963 for (pos = 0; pos < done;) { 6964 dp = (struct dirent *)(dirbuf + pos); 6965 pos += dp->d_reclen; 6966 /* 6967 * XXX: Temporarily we also accept DT_UNKNOWN, as this 6968 * is what we get when attribute was created on Solaris. 6969 */ 6970 if (dp->d_type != DT_REG && dp->d_type != DT_UNKNOWN) 6971 continue; 6972 if (plen == 0 && strncmp(dp->d_name, "freebsd:", 8) == 0) 6973 continue; 6974 else if (strncmp(dp->d_name, attrprefix, plen) != 0) 6975 continue; 6976 nlen = dp->d_namlen - plen; 6977 if (sizep != NULL) 6978 *sizep += 1 + nlen; 6979 else if (uio != NULL) { 6980 /* 6981 * Format of extattr name entry is one byte for 6982 * length and the rest for name. 6983 */ 6984 error = uiomove(&nlen, 1, uio->uio_rw, uio); 6985 if (error == 0) { 6986 error = uiomove(dp->d_name + plen, nlen, 6987 uio->uio_rw, uio); 6988 } 6989 if (error != 0) 6990 break; 6991 } 6992 } 6993 } while (!eof && error == 0); 6994 6995 vput(vp); 6996 ZFS_EXIT(zfsvfs); 6997 6998 return (error); 6999} 7000 7001int 7002zfs_freebsd_getacl(ap) 7003 struct vop_getacl_args /* { 7004 struct vnode *vp; 7005 acl_type_t type; 7006 struct acl *aclp; 7007 struct ucred *cred; 7008 struct thread *td; 7009 } */ *ap; 7010{ 7011 int error; 7012 vsecattr_t vsecattr; 7013 7014 if (ap->a_type != ACL_TYPE_NFS4) 7015 return (EINVAL); 7016 7017 vsecattr.vsa_mask = VSA_ACE | VSA_ACECNT; 7018 if (error = zfs_getsecattr(ap->a_vp, &vsecattr, 0, ap->a_cred, NULL)) 7019 return (error); 7020 7021 error = acl_from_aces(ap->a_aclp, vsecattr.vsa_aclentp, vsecattr.vsa_aclcnt); 7022 if (vsecattr.vsa_aclentp != NULL) 7023 kmem_free(vsecattr.vsa_aclentp, vsecattr.vsa_aclentsz); 7024 7025 return (error); 7026} 7027 7028int 7029zfs_freebsd_setacl(ap) 7030 struct vop_setacl_args /* { 7031 struct vnode *vp; 7032 acl_type_t type; 7033 struct acl *aclp; 7034 struct ucred *cred; 7035 struct thread *td; 7036 } */ *ap; 7037{ 7038 int error; 7039 vsecattr_t vsecattr; 7040 int aclbsize; /* size of acl list in bytes */ 7041 aclent_t *aaclp; 7042 7043 if (ap->a_type != ACL_TYPE_NFS4) 7044 return (EINVAL); 7045 7046 if (ap->a_aclp->acl_cnt < 1 || ap->a_aclp->acl_cnt > MAX_ACL_ENTRIES) 7047 return (EINVAL); 7048 7049 /* 7050 * With NFSv4 ACLs, chmod(2) may need to add additional entries, 7051 * splitting every entry into two and appending "canonical six" 7052 * entries at the end. Don't allow for setting an ACL that would 7053 * cause chmod(2) to run out of ACL entries. 7054 */ 7055 if (ap->a_aclp->acl_cnt * 2 + 6 > ACL_MAX_ENTRIES) 7056 return (ENOSPC); 7057 7058 error = acl_nfs4_check(ap->a_aclp, ap->a_vp->v_type == VDIR); 7059 if (error != 0) 7060 return (error); 7061 7062 vsecattr.vsa_mask = VSA_ACE; 7063 aclbsize = ap->a_aclp->acl_cnt * sizeof(ace_t); 7064 vsecattr.vsa_aclentp = kmem_alloc(aclbsize, KM_SLEEP); 7065 aaclp = vsecattr.vsa_aclentp; 7066 vsecattr.vsa_aclentsz = aclbsize; 7067 7068 aces_from_acl(vsecattr.vsa_aclentp, &vsecattr.vsa_aclcnt, ap->a_aclp); 7069 error = zfs_setsecattr(ap->a_vp, &vsecattr, 0, ap->a_cred, NULL); 7070 kmem_free(aaclp, aclbsize); 7071 7072 return (error); 7073} 7074 7075int 7076zfs_freebsd_aclcheck(ap) 7077 struct vop_aclcheck_args /* { 7078 struct vnode *vp; 7079 acl_type_t type; 7080 struct acl *aclp; 7081 struct ucred *cred; 7082 struct thread *td; 7083 } */ *ap; 7084{ 7085 7086 return (EOPNOTSUPP); 7087} 7088 7089struct vop_vector zfs_vnodeops; 7090struct vop_vector zfs_fifoops; 7091struct vop_vector zfs_shareops; 7092 7093struct vop_vector zfs_vnodeops = { 7094 .vop_default = &default_vnodeops, 7095 .vop_inactive = zfs_freebsd_inactive, 7096 .vop_reclaim = zfs_freebsd_reclaim, 7097 .vop_access = zfs_freebsd_access, 7098#ifdef FREEBSD_NAMECACHE 7099 .vop_lookup = vfs_cache_lookup, 7100 .vop_cachedlookup = zfs_freebsd_lookup, 7101#else 7102 .vop_lookup = zfs_freebsd_lookup, 7103#endif 7104 .vop_getattr = zfs_freebsd_getattr, 7105 .vop_setattr = zfs_freebsd_setattr, 7106 .vop_create = zfs_freebsd_create, 7107 .vop_mknod = zfs_freebsd_create, 7108 .vop_mkdir = zfs_freebsd_mkdir, 7109 .vop_readdir = zfs_freebsd_readdir, 7110 .vop_fsync = zfs_freebsd_fsync, 7111 .vop_open = zfs_freebsd_open, 7112 .vop_close = zfs_freebsd_close, 7113 .vop_rmdir = zfs_freebsd_rmdir, 7114 .vop_ioctl = zfs_freebsd_ioctl, 7115 .vop_link = zfs_freebsd_link, 7116 .vop_symlink = zfs_freebsd_symlink, 7117 .vop_readlink = zfs_freebsd_readlink, 7118 .vop_read = zfs_freebsd_read, 7119 .vop_write = zfs_freebsd_write, 7120 .vop_remove = zfs_freebsd_remove, 7121 .vop_rename = zfs_freebsd_rename, 7122 .vop_pathconf = zfs_freebsd_pathconf, 7123 .vop_bmap = zfs_freebsd_bmap, 7124 .vop_fid = zfs_freebsd_fid, 7125 .vop_getextattr = zfs_getextattr, 7126 .vop_deleteextattr = zfs_deleteextattr, 7127 .vop_setextattr = zfs_setextattr, 7128 .vop_listextattr = zfs_listextattr, 7129 .vop_getacl = zfs_freebsd_getacl, 7130 .vop_setacl = zfs_freebsd_setacl, 7131 .vop_aclcheck = zfs_freebsd_aclcheck, 7132 .vop_getpages = zfs_freebsd_getpages, 7133 .vop_putpages = zfs_freebsd_putpages, 7134}; 7135 7136struct vop_vector zfs_fifoops = { 7137 .vop_default = &fifo_specops, 7138 .vop_fsync = zfs_freebsd_fsync, 7139 .vop_access = zfs_freebsd_access, 7140 .vop_getattr = zfs_freebsd_getattr, 7141 .vop_inactive = zfs_freebsd_inactive, 7142 .vop_read = VOP_PANIC, 7143 .vop_reclaim = zfs_freebsd_reclaim, 7144 .vop_setattr = zfs_freebsd_setattr, 7145 .vop_write = VOP_PANIC, 7146 .vop_pathconf = zfs_freebsd_fifo_pathconf, 7147 .vop_fid = zfs_freebsd_fid, 7148 .vop_getacl = zfs_freebsd_getacl, 7149 .vop_setacl = zfs_freebsd_setacl, 7150 .vop_aclcheck = zfs_freebsd_aclcheck, 7151}; 7152 7153/* 7154 * special share hidden files vnode operations template 7155 */ 7156struct vop_vector zfs_shareops = { 7157 .vop_default = &default_vnodeops, 7158 .vop_access = zfs_freebsd_access, 7159 .vop_inactive = zfs_freebsd_inactive, 7160 .vop_reclaim = zfs_freebsd_reclaim, 7161 .vop_fid = zfs_freebsd_fid, 7162 .vop_pathconf = zfs_freebsd_pathconf, 7163}; 7164