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 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2012, 2017 by Delphix. All rights reserved. 25 * Copyright (c) 2014 Integros [integros.com] 26 * Copyright 2015 Joyent, Inc. 27 * Copyright 2017 Nexenta Systems, Inc. 28 */ 29 30 /* Portions Copyright 2007 Jeremy Teo */ 31 /* Portions Copyright 2010 Robert Milkowski */ 32 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <sys/time.h> 36 #include <sys/systm.h> 37 #include <sys/sysmacros.h> 38 #include <sys/resource.h> 39 #include <sys/vfs.h> 40 #include <sys/vfs_opreg.h> 41 #include <sys/vnode.h> 42 #include <sys/file.h> 43 #include <sys/stat.h> 44 #include <sys/kmem.h> 45 #include <sys/taskq.h> 46 #include <sys/uio.h> 47 #include <sys/vmsystm.h> 48 #include <sys/atomic.h> 49 #include <sys/vm.h> 50 #include <vm/seg_vn.h> 51 #include <vm/pvn.h> 52 #include <vm/as.h> 53 #include <vm/kpm.h> 54 #include <vm/seg_kpm.h> 55 #include <sys/mman.h> 56 #include <sys/pathname.h> 57 #include <sys/cmn_err.h> 58 #include <sys/errno.h> 59 #include <sys/unistd.h> 60 #include <sys/zfs_dir.h> 61 #include <sys/zfs_acl.h> 62 #include <sys/zfs_ioctl.h> 63 #include <sys/fs/zfs.h> 64 #include <sys/dmu.h> 65 #include <sys/dmu_objset.h> 66 #include <sys/spa.h> 67 #include <sys/txg.h> 68 #include <sys/dbuf.h> 69 #include <sys/zap.h> 70 #include <sys/sa.h> 71 #include <sys/dirent.h> 72 #include <sys/policy.h> 73 #include <sys/sunddi.h> 74 #include <sys/filio.h> 75 #include <sys/sid.h> 76 #include "fs/fs_subr.h" 77 #include <sys/zfs_ctldir.h> 78 #include <sys/zfs_fuid.h> 79 #include <sys/zfs_sa.h> 80 #include <sys/dnlc.h> 81 #include <sys/zfs_rlock.h> 82 #include <sys/extdirent.h> 83 #include <sys/kidmap.h> 84 #include <sys/cred.h> 85 #include <sys/attr.h> 86 #include <sys/zil.h> 87 88 /* 89 * Programming rules. 90 * 91 * Each vnode op performs some logical unit of work. To do this, the ZPL must 92 * properly lock its in-core state, create a DMU transaction, do the work, 93 * record this work in the intent log (ZIL), commit the DMU transaction, 94 * and wait for the intent log to commit if it is a synchronous operation. 95 * Moreover, the vnode ops must work in both normal and log replay context. 96 * The ordering of events is important to avoid deadlocks and references 97 * to freed memory. The example below illustrates the following Big Rules: 98 * 99 * (1) A check must be made in each zfs thread for a mounted file system. 100 * This is done avoiding races using ZFS_ENTER(zfsvfs). 101 * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes 102 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros 103 * can return EIO from the calling function. 104 * 105 * (2) VN_RELE() should always be the last thing except for zil_commit() 106 * (if necessary) and ZFS_EXIT(). This is for 3 reasons: 107 * First, if it's the last reference, the vnode/znode 108 * can be freed, so the zp may point to freed memory. Second, the last 109 * reference will call zfs_zinactive(), which may induce a lot of work -- 110 * pushing cached pages (which acquires range locks) and syncing out 111 * cached atime changes. Third, zfs_zinactive() may require a new tx, 112 * which could deadlock the system if you were already holding one. 113 * If you must call VN_RELE() within a tx then use VN_RELE_ASYNC(). 114 * 115 * (3) All range locks must be grabbed before calling dmu_tx_assign(), 116 * as they can span dmu_tx_assign() calls. 117 * 118 * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to 119 * dmu_tx_assign(). This is critical because we don't want to block 120 * while holding locks. 121 * 122 * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This 123 * reduces lock contention and CPU usage when we must wait (note that if 124 * throughput is constrained by the storage, nearly every transaction 125 * must wait). 126 * 127 * Note, in particular, that if a lock is sometimes acquired before 128 * the tx assigns, and sometimes after (e.g. z_lock), then failing 129 * to use a non-blocking assign can deadlock the system. The scenario: 130 * 131 * Thread A has grabbed a lock before calling dmu_tx_assign(). 132 * Thread B is in an already-assigned tx, and blocks for this lock. 133 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open() 134 * forever, because the previous txg can't quiesce until B's tx commits. 135 * 136 * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT, 137 * then drop all locks, call dmu_tx_wait(), and try again. On subsequent 138 * calls to dmu_tx_assign(), pass TXG_WAITED rather than TXG_NOWAIT, 139 * to indicate that this operation has already called dmu_tx_wait(). 140 * This will ensure that we don't retry forever, waiting a short bit 141 * each time. 142 * 143 * (5) If the operation succeeded, generate the intent log entry for it 144 * before dropping locks. This ensures that the ordering of events 145 * in the intent log matches the order in which they actually occurred. 146 * During ZIL replay the zfs_log_* functions will update the sequence 147 * number to indicate the zil transaction has replayed. 148 * 149 * (6) At the end of each vnode op, the DMU tx must always commit, 150 * regardless of whether there were any errors. 151 * 152 * (7) After dropping all locks, invoke zil_commit(zilog, foid) 153 * to ensure that synchronous semantics are provided when necessary. 154 * 155 * In general, this is how things should be ordered in each vnode op: 156 * 157 * ZFS_ENTER(zfsvfs); // exit if unmounted 158 * top: 159 * zfs_dirent_lock(&dl, ...) // lock directory entry (may VN_HOLD()) 160 * rw_enter(...); // grab any other locks you need 161 * tx = dmu_tx_create(...); // get DMU tx 162 * dmu_tx_hold_*(); // hold each object you might modify 163 * error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 164 * if (error) { 165 * rw_exit(...); // drop locks 166 * zfs_dirent_unlock(dl); // unlock directory entry 167 * VN_RELE(...); // release held vnodes 168 * if (error == ERESTART) { 169 * waited = B_TRUE; 170 * dmu_tx_wait(tx); 171 * dmu_tx_abort(tx); 172 * goto top; 173 * } 174 * dmu_tx_abort(tx); // abort DMU tx 175 * ZFS_EXIT(zfsvfs); // finished in zfs 176 * return (error); // really out of space 177 * } 178 * error = do_real_work(); // do whatever this VOP does 179 * if (error == 0) 180 * zfs_log_*(...); // on success, make ZIL entry 181 * dmu_tx_commit(tx); // commit DMU tx -- error or not 182 * rw_exit(...); // drop locks 183 * zfs_dirent_unlock(dl); // unlock directory entry 184 * VN_RELE(...); // release held vnodes 185 * zil_commit(zilog, foid); // synchronous when necessary 186 * ZFS_EXIT(zfsvfs); // finished in zfs 187 * return (error); // done, report error 188 */ 189 190 /* ARGSUSED */ 191 static int 192 zfs_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct) 193 { 194 znode_t *zp = VTOZ(*vpp); 195 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 196 197 ZFS_ENTER(zfsvfs); 198 ZFS_VERIFY_ZP(zp); 199 200 if ((flag & FWRITE) && (zp->z_pflags & ZFS_APPENDONLY) && 201 ((flag & FAPPEND) == 0)) { 202 ZFS_EXIT(zfsvfs); 203 return (SET_ERROR(EPERM)); 204 } 205 206 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan && 207 ZTOV(zp)->v_type == VREG && 208 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) { 209 if (fs_vscan(*vpp, cr, 0) != 0) { 210 ZFS_EXIT(zfsvfs); 211 return (SET_ERROR(EACCES)); 212 } 213 } 214 215 /* Keep a count of the synchronous opens in the znode */ 216 if (flag & (FSYNC | FDSYNC)) 217 atomic_inc_32(&zp->z_sync_cnt); 218 219 ZFS_EXIT(zfsvfs); 220 return (0); 221 } 222 223 /* ARGSUSED */ 224 static int 225 zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr, 226 caller_context_t *ct) 227 { 228 znode_t *zp = VTOZ(vp); 229 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 230 231 /* 232 * Clean up any locks held by this process on the vp. 233 */ 234 cleanlocks(vp, ddi_get_pid(), 0); 235 cleanshares(vp, ddi_get_pid()); 236 237 ZFS_ENTER(zfsvfs); 238 ZFS_VERIFY_ZP(zp); 239 240 /* Decrement the synchronous opens in the znode */ 241 if ((flag & (FSYNC | FDSYNC)) && (count == 1)) 242 atomic_dec_32(&zp->z_sync_cnt); 243 244 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan && 245 ZTOV(zp)->v_type == VREG && 246 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) 247 VERIFY(fs_vscan(vp, cr, 1) == 0); 248 249 ZFS_EXIT(zfsvfs); 250 return (0); 251 } 252 253 /* 254 * Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and 255 * data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter. 256 */ 257 static int 258 zfs_holey(vnode_t *vp, int cmd, offset_t *off) 259 { 260 znode_t *zp = VTOZ(vp); 261 uint64_t noff = (uint64_t)*off; /* new offset */ 262 uint64_t file_sz; 263 int error; 264 boolean_t hole; 265 266 file_sz = zp->z_size; 267 if (noff >= file_sz) { 268 return (SET_ERROR(ENXIO)); 269 } 270 271 if (cmd == _FIO_SEEK_HOLE) 272 hole = B_TRUE; 273 else 274 hole = B_FALSE; 275 276 error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff); 277 278 if (error == ESRCH) 279 return (SET_ERROR(ENXIO)); 280 281 /* 282 * We could find a hole that begins after the logical end-of-file, 283 * because dmu_offset_next() only works on whole blocks. If the 284 * EOF falls mid-block, then indicate that the "virtual hole" 285 * at the end of the file begins at the logical EOF, rather than 286 * at the end of the last block. 287 */ 288 if (noff > file_sz) { 289 ASSERT(hole); 290 noff = file_sz; 291 } 292 293 if (noff < *off) 294 return (error); 295 *off = noff; 296 return (error); 297 } 298 299 /* ARGSUSED */ 300 static int 301 zfs_ioctl(vnode_t *vp, int com, intptr_t data, int flag, cred_t *cred, 302 int *rvalp, caller_context_t *ct) 303 { 304 offset_t off; 305 offset_t ndata; 306 dmu_object_info_t doi; 307 int error; 308 zfsvfs_t *zfsvfs; 309 znode_t *zp; 310 311 switch (com) { 312 case _FIOFFS: 313 { 314 return (zfs_sync(vp->v_vfsp, 0, cred)); 315 316 /* 317 * The following two ioctls are used by bfu. Faking out, 318 * necessary to avoid bfu errors. 319 */ 320 } 321 case _FIOGDIO: 322 case _FIOSDIO: 323 { 324 return (0); 325 } 326 327 case _FIO_SEEK_DATA: 328 case _FIO_SEEK_HOLE: 329 { 330 if (ddi_copyin((void *)data, &off, sizeof (off), flag)) 331 return (SET_ERROR(EFAULT)); 332 333 zp = VTOZ(vp); 334 zfsvfs = zp->z_zfsvfs; 335 ZFS_ENTER(zfsvfs); 336 ZFS_VERIFY_ZP(zp); 337 338 /* offset parameter is in/out */ 339 error = zfs_holey(vp, com, &off); 340 ZFS_EXIT(zfsvfs); 341 if (error) 342 return (error); 343 if (ddi_copyout(&off, (void *)data, sizeof (off), flag)) 344 return (SET_ERROR(EFAULT)); 345 return (0); 346 } 347 case _FIO_COUNT_FILLED: 348 { 349 /* 350 * _FIO_COUNT_FILLED adds a new ioctl command which 351 * exposes the number of filled blocks in a 352 * ZFS object. 353 */ 354 zp = VTOZ(vp); 355 zfsvfs = zp->z_zfsvfs; 356 ZFS_ENTER(zfsvfs); 357 ZFS_VERIFY_ZP(zp); 358 359 /* 360 * Wait for all dirty blocks for this object 361 * to get synced out to disk, and the DMU info 362 * updated. 363 */ 364 error = dmu_object_wait_synced(zfsvfs->z_os, zp->z_id); 365 if (error) { 366 ZFS_EXIT(zfsvfs); 367 return (error); 368 } 369 370 /* 371 * Retrieve fill count from DMU object. 372 */ 373 error = dmu_object_info(zfsvfs->z_os, zp->z_id, &doi); 374 if (error) { 375 ZFS_EXIT(zfsvfs); 376 return (error); 377 } 378 379 ndata = doi.doi_fill_count; 380 381 ZFS_EXIT(zfsvfs); 382 if (ddi_copyout(&ndata, (void *)data, sizeof (ndata), flag)) 383 return (SET_ERROR(EFAULT)); 384 return (0); 385 } 386 } 387 return (SET_ERROR(ENOTTY)); 388 } 389 390 /* 391 * Utility functions to map and unmap a single physical page. These 392 * are used to manage the mappable copies of ZFS file data, and therefore 393 * do not update ref/mod bits. 394 */ 395 caddr_t 396 zfs_map_page(page_t *pp, enum seg_rw rw) 397 { 398 if (kpm_enable) 399 return (hat_kpm_mapin(pp, 0)); 400 ASSERT(rw == S_READ || rw == S_WRITE); 401 return (ppmapin(pp, PROT_READ | ((rw == S_WRITE) ? PROT_WRITE : 0), 402 (caddr_t)-1)); 403 } 404 405 void 406 zfs_unmap_page(page_t *pp, caddr_t addr) 407 { 408 if (kpm_enable) { 409 hat_kpm_mapout(pp, 0, addr); 410 } else { 411 ppmapout(addr); 412 } 413 } 414 415 /* 416 * When a file is memory mapped, we must keep the IO data synchronized 417 * between the DMU cache and the memory mapped pages. What this means: 418 * 419 * On Write: If we find a memory mapped page, we write to *both* 420 * the page and the dmu buffer. 421 */ 422 static void 423 update_pages(vnode_t *vp, int64_t start, int len, objset_t *os, uint64_t oid) 424 { 425 int64_t off; 426 427 off = start & PAGEOFFSET; 428 for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 429 page_t *pp; 430 uint64_t nbytes = MIN(PAGESIZE - off, len); 431 432 if (pp = page_lookup(vp, start, SE_SHARED)) { 433 caddr_t va; 434 435 va = zfs_map_page(pp, S_WRITE); 436 (void) dmu_read(os, oid, start+off, nbytes, va+off, 437 DMU_READ_PREFETCH); 438 zfs_unmap_page(pp, va); 439 page_unlock(pp); 440 } 441 len -= nbytes; 442 off = 0; 443 } 444 } 445 446 /* 447 * When a file is memory mapped, we must keep the IO data synchronized 448 * between the DMU cache and the memory mapped pages. What this means: 449 * 450 * On Read: We "read" preferentially from memory mapped pages, 451 * else we default from the dmu buffer. 452 * 453 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when 454 * the file is memory mapped. 455 */ 456 static int 457 mappedread(vnode_t *vp, int nbytes, uio_t *uio) 458 { 459 znode_t *zp = VTOZ(vp); 460 int64_t start, off; 461 int len = nbytes; 462 int error = 0; 463 464 start = uio->uio_loffset; 465 off = start & PAGEOFFSET; 466 for (start &= PAGEMASK; len > 0; start += PAGESIZE) { 467 page_t *pp; 468 uint64_t bytes = MIN(PAGESIZE - off, len); 469 470 if (pp = page_lookup(vp, start, SE_SHARED)) { 471 caddr_t va; 472 473 va = zfs_map_page(pp, S_READ); 474 error = uiomove(va + off, bytes, UIO_READ, uio); 475 zfs_unmap_page(pp, va); 476 page_unlock(pp); 477 } else { 478 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl), 479 uio, bytes); 480 } 481 len -= bytes; 482 off = 0; 483 if (error) 484 break; 485 } 486 return (error); 487 } 488 489 offset_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */ 490 491 /* 492 * Read bytes from specified file into supplied buffer. 493 * 494 * IN: vp - vnode of file to be read from. 495 * uio - structure supplying read location, range info, 496 * and return buffer. 497 * ioflag - SYNC flags; used to provide FRSYNC semantics. 498 * cr - credentials of caller. 499 * ct - caller context 500 * 501 * OUT: uio - updated offset and range, buffer filled. 502 * 503 * RETURN: 0 on success, error code on failure. 504 * 505 * Side Effects: 506 * vp - atime updated if byte count > 0 507 */ 508 /* ARGSUSED */ 509 static int 510 zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 511 { 512 znode_t *zp = VTOZ(vp); 513 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 514 ssize_t n, nbytes; 515 int error = 0; 516 rl_t *rl; 517 xuio_t *xuio = NULL; 518 519 ZFS_ENTER(zfsvfs); 520 ZFS_VERIFY_ZP(zp); 521 522 if (zp->z_pflags & ZFS_AV_QUARANTINED) { 523 ZFS_EXIT(zfsvfs); 524 return (SET_ERROR(EACCES)); 525 } 526 527 /* 528 * Validate file offset 529 */ 530 if (uio->uio_loffset < (offset_t)0) { 531 ZFS_EXIT(zfsvfs); 532 return (SET_ERROR(EINVAL)); 533 } 534 535 /* 536 * Fasttrack empty reads 537 */ 538 if (uio->uio_resid == 0) { 539 ZFS_EXIT(zfsvfs); 540 return (0); 541 } 542 543 /* 544 * Check for mandatory locks 545 */ 546 if (MANDMODE(zp->z_mode)) { 547 if (error = chklock(vp, FREAD, 548 uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) { 549 ZFS_EXIT(zfsvfs); 550 return (error); 551 } 552 } 553 554 /* 555 * If we're in FRSYNC mode, sync out this znode before reading it. 556 */ 557 if (ioflag & FRSYNC || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 558 zil_commit(zfsvfs->z_log, zp->z_id); 559 560 /* 561 * Lock the range against changes. 562 */ 563 rl = zfs_range_lock(zp, uio->uio_loffset, uio->uio_resid, RL_READER); 564 565 /* 566 * If we are reading past end-of-file we can skip 567 * to the end; but we might still need to set atime. 568 */ 569 if (uio->uio_loffset >= zp->z_size) { 570 error = 0; 571 goto out; 572 } 573 574 ASSERT(uio->uio_loffset < zp->z_size); 575 n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset); 576 577 if ((uio->uio_extflg == UIO_XUIO) && 578 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) { 579 int nblk; 580 int blksz = zp->z_blksz; 581 uint64_t offset = uio->uio_loffset; 582 583 xuio = (xuio_t *)uio; 584 if ((ISP2(blksz))) { 585 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset, 586 blksz)) / blksz; 587 } else { 588 ASSERT(offset + n <= blksz); 589 nblk = 1; 590 } 591 (void) dmu_xuio_init(xuio, nblk); 592 593 if (vn_has_cached_data(vp)) { 594 /* 595 * For simplicity, we always allocate a full buffer 596 * even if we only expect to read a portion of a block. 597 */ 598 while (--nblk >= 0) { 599 (void) dmu_xuio_add(xuio, 600 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 601 blksz), 0, blksz); 602 } 603 } 604 } 605 606 while (n > 0) { 607 nbytes = MIN(n, zfs_read_chunk_size - 608 P2PHASE(uio->uio_loffset, zfs_read_chunk_size)); 609 610 if (vn_has_cached_data(vp)) { 611 error = mappedread(vp, nbytes, uio); 612 } else { 613 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl), 614 uio, nbytes); 615 } 616 if (error) { 617 /* convert checksum errors into IO errors */ 618 if (error == ECKSUM) 619 error = SET_ERROR(EIO); 620 break; 621 } 622 623 n -= nbytes; 624 } 625 out: 626 zfs_range_unlock(rl); 627 628 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 629 ZFS_EXIT(zfsvfs); 630 return (error); 631 } 632 633 /* 634 * Write the bytes to a file. 635 * 636 * IN: vp - vnode of file to be written to. 637 * uio - structure supplying write location, range info, 638 * and data buffer. 639 * ioflag - FAPPEND, FSYNC, and/or FDSYNC. FAPPEND is 640 * set if in append mode. 641 * cr - credentials of caller. 642 * ct - caller context (NFS/CIFS fem monitor only) 643 * 644 * OUT: uio - updated offset and range. 645 * 646 * RETURN: 0 on success, error code on failure. 647 * 648 * Timestamps: 649 * vp - ctime|mtime updated if byte count > 0 650 */ 651 652 /* ARGSUSED */ 653 static int 654 zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct) 655 { 656 znode_t *zp = VTOZ(vp); 657 rlim64_t limit = uio->uio_llimit; 658 ssize_t start_resid = uio->uio_resid; 659 ssize_t tx_bytes; 660 uint64_t end_size; 661 dmu_tx_t *tx; 662 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 663 zilog_t *zilog; 664 offset_t woff; 665 ssize_t n, nbytes; 666 rl_t *rl; 667 int max_blksz = zfsvfs->z_max_blksz; 668 int error = 0; 669 arc_buf_t *abuf; 670 iovec_t *aiov = NULL; 671 xuio_t *xuio = NULL; 672 int i_iov = 0; 673 int iovcnt = uio->uio_iovcnt; 674 iovec_t *iovp = uio->uio_iov; 675 int write_eof; 676 int count = 0; 677 sa_bulk_attr_t bulk[4]; 678 uint64_t mtime[2], ctime[2]; 679 680 /* 681 * Fasttrack empty write 682 */ 683 n = start_resid; 684 if (n == 0) 685 return (0); 686 687 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T) 688 limit = MAXOFFSET_T; 689 690 ZFS_ENTER(zfsvfs); 691 ZFS_VERIFY_ZP(zp); 692 693 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); 694 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); 695 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 696 &zp->z_size, 8); 697 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 698 &zp->z_pflags, 8); 699 700 /* 701 * In a case vp->v_vfsp != zp->z_zfsvfs->z_vfs (e.g. snapshots) our 702 * callers might not be able to detect properly that we are read-only, 703 * so check it explicitly here. 704 */ 705 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { 706 ZFS_EXIT(zfsvfs); 707 return (SET_ERROR(EROFS)); 708 } 709 710 /* 711 * If immutable or not appending then return EPERM. 712 * Intentionally allow ZFS_READONLY through here. 713 * See zfs_zaccess_common() 714 */ 715 if ((zp->z_pflags & ZFS_IMMUTABLE) || 716 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) && 717 (uio->uio_loffset < zp->z_size))) { 718 ZFS_EXIT(zfsvfs); 719 return (SET_ERROR(EPERM)); 720 } 721 722 zilog = zfsvfs->z_log; 723 724 /* 725 * Validate file offset 726 */ 727 woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset; 728 if (woff < 0) { 729 ZFS_EXIT(zfsvfs); 730 return (SET_ERROR(EINVAL)); 731 } 732 733 /* 734 * Check for mandatory locks before calling zfs_range_lock() 735 * in order to prevent a deadlock with locks set via fcntl(). 736 */ 737 if (MANDMODE((mode_t)zp->z_mode) && 738 (error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) { 739 ZFS_EXIT(zfsvfs); 740 return (error); 741 } 742 743 /* 744 * Pre-fault the pages to ensure slow (eg NFS) pages 745 * don't hold up txg. 746 * Skip this if uio contains loaned arc_buf. 747 */ 748 if ((uio->uio_extflg == UIO_XUIO) && 749 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) 750 xuio = (xuio_t *)uio; 751 else 752 uio_prefaultpages(MIN(n, max_blksz), uio); 753 754 /* 755 * If in append mode, set the io offset pointer to eof. 756 */ 757 if (ioflag & FAPPEND) { 758 /* 759 * Obtain an appending range lock to guarantee file append 760 * semantics. We reset the write offset once we have the lock. 761 */ 762 rl = zfs_range_lock(zp, 0, n, RL_APPEND); 763 woff = rl->r_off; 764 if (rl->r_len == UINT64_MAX) { 765 /* 766 * We overlocked the file because this write will cause 767 * the file block size to increase. 768 * Note that zp_size cannot change with this lock held. 769 */ 770 woff = zp->z_size; 771 } 772 uio->uio_loffset = woff; 773 } else { 774 /* 775 * Note that if the file block size will change as a result of 776 * this write, then this range lock will lock the entire file 777 * so that we can re-write the block safely. 778 */ 779 rl = zfs_range_lock(zp, woff, n, RL_WRITER); 780 } 781 782 if (woff >= limit) { 783 zfs_range_unlock(rl); 784 ZFS_EXIT(zfsvfs); 785 return (SET_ERROR(EFBIG)); 786 } 787 788 if ((woff + n) > limit || woff > (limit - n)) 789 n = limit - woff; 790 791 /* Will this write extend the file length? */ 792 write_eof = (woff + n > zp->z_size); 793 794 end_size = MAX(zp->z_size, woff + n); 795 796 /* 797 * Write the file in reasonable size chunks. Each chunk is written 798 * in a separate transaction; this keeps the intent log records small 799 * and allows us to do more fine-grained space accounting. 800 */ 801 while (n > 0) { 802 abuf = NULL; 803 woff = uio->uio_loffset; 804 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 805 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 806 if (abuf != NULL) 807 dmu_return_arcbuf(abuf); 808 error = SET_ERROR(EDQUOT); 809 break; 810 } 811 812 if (xuio && abuf == NULL) { 813 ASSERT(i_iov < iovcnt); 814 aiov = &iovp[i_iov]; 815 abuf = dmu_xuio_arcbuf(xuio, i_iov); 816 dmu_xuio_clear(xuio, i_iov); 817 DTRACE_PROBE3(zfs_cp_write, int, i_iov, 818 iovec_t *, aiov, arc_buf_t *, abuf); 819 ASSERT((aiov->iov_base == abuf->b_data) || 820 ((char *)aiov->iov_base - (char *)abuf->b_data + 821 aiov->iov_len == arc_buf_size(abuf))); 822 i_iov++; 823 } else if (abuf == NULL && n >= max_blksz && 824 woff >= zp->z_size && 825 P2PHASE(woff, max_blksz) == 0 && 826 zp->z_blksz == max_blksz) { 827 /* 828 * This write covers a full block. "Borrow" a buffer 829 * from the dmu so that we can fill it before we enter 830 * a transaction. This avoids the possibility of 831 * holding up the transaction if the data copy hangs 832 * up on a pagefault (e.g., from an NFS server mapping). 833 */ 834 size_t cbytes; 835 836 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 837 max_blksz); 838 ASSERT(abuf != NULL); 839 ASSERT(arc_buf_size(abuf) == max_blksz); 840 if (error = uiocopy(abuf->b_data, max_blksz, 841 UIO_WRITE, uio, &cbytes)) { 842 dmu_return_arcbuf(abuf); 843 break; 844 } 845 ASSERT(cbytes == max_blksz); 846 } 847 848 /* 849 * Start a transaction. 850 */ 851 tx = dmu_tx_create(zfsvfs->z_os); 852 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 853 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz)); 854 zfs_sa_upgrade_txholds(tx, zp); 855 error = dmu_tx_assign(tx, TXG_WAIT); 856 if (error) { 857 dmu_tx_abort(tx); 858 if (abuf != NULL) 859 dmu_return_arcbuf(abuf); 860 break; 861 } 862 863 /* 864 * If zfs_range_lock() over-locked we grow the blocksize 865 * and then reduce the lock range. This will only happen 866 * on the first iteration since zfs_range_reduce() will 867 * shrink down r_len to the appropriate size. 868 */ 869 if (rl->r_len == UINT64_MAX) { 870 uint64_t new_blksz; 871 872 if (zp->z_blksz > max_blksz) { 873 /* 874 * File's blocksize is already larger than the 875 * "recordsize" property. Only let it grow to 876 * the next power of 2. 877 */ 878 ASSERT(!ISP2(zp->z_blksz)); 879 new_blksz = MIN(end_size, 880 1 << highbit64(zp->z_blksz)); 881 } else { 882 new_blksz = MIN(end_size, max_blksz); 883 } 884 zfs_grow_blocksize(zp, new_blksz, tx); 885 zfs_range_reduce(rl, woff, n); 886 } 887 888 /* 889 * XXX - should we really limit each write to z_max_blksz? 890 * Perhaps we should use SPA_MAXBLOCKSIZE chunks? 891 */ 892 nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz)); 893 894 if (abuf == NULL) { 895 tx_bytes = uio->uio_resid; 896 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl), 897 uio, nbytes, tx); 898 tx_bytes -= uio->uio_resid; 899 } else { 900 tx_bytes = nbytes; 901 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len); 902 /* 903 * If this is not a full block write, but we are 904 * extending the file past EOF and this data starts 905 * block-aligned, use assign_arcbuf(). Otherwise, 906 * write via dmu_write(). 907 */ 908 if (tx_bytes < max_blksz && (!write_eof || 909 aiov->iov_base != abuf->b_data)) { 910 ASSERT(xuio); 911 dmu_write(zfsvfs->z_os, zp->z_id, woff, 912 aiov->iov_len, aiov->iov_base, tx); 913 dmu_return_arcbuf(abuf); 914 xuio_stat_wbuf_copied(); 915 } else { 916 ASSERT(xuio || tx_bytes == max_blksz); 917 dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl), 918 woff, abuf, tx); 919 } 920 ASSERT(tx_bytes <= uio->uio_resid); 921 uioskip(uio, tx_bytes); 922 } 923 if (tx_bytes && vn_has_cached_data(vp)) { 924 update_pages(vp, woff, 925 tx_bytes, zfsvfs->z_os, zp->z_id); 926 } 927 928 /* 929 * If we made no progress, we're done. If we made even 930 * partial progress, update the znode and ZIL accordingly. 931 */ 932 if (tx_bytes == 0) { 933 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs), 934 (void *)&zp->z_size, sizeof (uint64_t), tx); 935 dmu_tx_commit(tx); 936 ASSERT(error != 0); 937 break; 938 } 939 940 /* 941 * Clear Set-UID/Set-GID bits on successful write if not 942 * privileged and at least one of the excute bits is set. 943 * 944 * It would be nice to to this after all writes have 945 * been done, but that would still expose the ISUID/ISGID 946 * to another app after the partial write is committed. 947 * 948 * Note: we don't call zfs_fuid_map_id() here because 949 * user 0 is not an ephemeral uid. 950 */ 951 mutex_enter(&zp->z_acl_lock); 952 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) | 953 (S_IXUSR >> 6))) != 0 && 954 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 && 955 secpolicy_vnode_setid_retain(cr, 956 (zp->z_mode & S_ISUID) != 0 && zp->z_uid == 0) != 0) { 957 uint64_t newmode; 958 zp->z_mode &= ~(S_ISUID | S_ISGID); 959 newmode = zp->z_mode; 960 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), 961 (void *)&newmode, sizeof (uint64_t), tx); 962 } 963 mutex_exit(&zp->z_acl_lock); 964 965 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 966 B_TRUE); 967 968 /* 969 * Update the file size (zp_size) if it has changed; 970 * account for possible concurrent updates. 971 */ 972 while ((end_size = zp->z_size) < uio->uio_loffset) { 973 (void) atomic_cas_64(&zp->z_size, end_size, 974 uio->uio_loffset); 975 ASSERT(error == 0); 976 } 977 /* 978 * If we are replaying and eof is non zero then force 979 * the file size to the specified eof. Note, there's no 980 * concurrency during replay. 981 */ 982 if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0) 983 zp->z_size = zfsvfs->z_replay_eof; 984 985 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 986 987 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag); 988 dmu_tx_commit(tx); 989 990 if (error != 0) 991 break; 992 ASSERT(tx_bytes == nbytes); 993 n -= nbytes; 994 995 if (!xuio && n > 0) 996 uio_prefaultpages(MIN(n, max_blksz), uio); 997 } 998 999 zfs_range_unlock(rl); 1000 1001 /* 1002 * If we're in replay mode, or we made no progress, return error. 1003 * Otherwise, it's at least a partial write, so it's successful. 1004 */ 1005 if (zfsvfs->z_replay || uio->uio_resid == start_resid) { 1006 ZFS_EXIT(zfsvfs); 1007 return (error); 1008 } 1009 1010 if (ioflag & (FSYNC | FDSYNC) || 1011 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 1012 zil_commit(zilog, zp->z_id); 1013 1014 ZFS_EXIT(zfsvfs); 1015 return (0); 1016 } 1017 1018 void 1019 zfs_get_done(zgd_t *zgd, int error) 1020 { 1021 znode_t *zp = zgd->zgd_private; 1022 objset_t *os = zp->z_zfsvfs->z_os; 1023 1024 if (zgd->zgd_db) 1025 dmu_buf_rele(zgd->zgd_db, zgd); 1026 1027 zfs_range_unlock(zgd->zgd_rl); 1028 1029 /* 1030 * Release the vnode asynchronously as we currently have the 1031 * txg stopped from syncing. 1032 */ 1033 VN_RELE_ASYNC(ZTOV(zp), dsl_pool_vnrele_taskq(dmu_objset_pool(os))); 1034 1035 if (error == 0 && zgd->zgd_bp) 1036 zil_lwb_add_block(zgd->zgd_lwb, zgd->zgd_bp); 1037 1038 kmem_free(zgd, sizeof (zgd_t)); 1039 } 1040 1041 #ifdef DEBUG 1042 static int zil_fault_io = 0; 1043 #endif 1044 1045 /* 1046 * Get data to generate a TX_WRITE intent log record. 1047 */ 1048 int 1049 zfs_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) 1050 { 1051 zfsvfs_t *zfsvfs = arg; 1052 objset_t *os = zfsvfs->z_os; 1053 znode_t *zp; 1054 uint64_t object = lr->lr_foid; 1055 uint64_t offset = lr->lr_offset; 1056 uint64_t size = lr->lr_length; 1057 dmu_buf_t *db; 1058 zgd_t *zgd; 1059 int error = 0; 1060 1061 ASSERT3P(lwb, !=, NULL); 1062 ASSERT3P(zio, !=, NULL); 1063 ASSERT3U(size, !=, 0); 1064 1065 /* 1066 * Nothing to do if the file has been removed 1067 */ 1068 if (zfs_zget(zfsvfs, object, &zp) != 0) 1069 return (SET_ERROR(ENOENT)); 1070 if (zp->z_unlinked) { 1071 /* 1072 * Release the vnode asynchronously as we currently have the 1073 * txg stopped from syncing. 1074 */ 1075 VN_RELE_ASYNC(ZTOV(zp), 1076 dsl_pool_vnrele_taskq(dmu_objset_pool(os))); 1077 return (SET_ERROR(ENOENT)); 1078 } 1079 1080 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1081 zgd->zgd_lwb = lwb; 1082 zgd->zgd_private = zp; 1083 1084 /* 1085 * Write records come in two flavors: immediate and indirect. 1086 * For small writes it's cheaper to store the data with the 1087 * log record (immediate); for large writes it's cheaper to 1088 * sync the data and get a pointer to it (indirect) so that 1089 * we don't have to write the data twice. 1090 */ 1091 if (buf != NULL) { /* immediate write */ 1092 zgd->zgd_rl = zfs_range_lock(zp, offset, size, RL_READER); 1093 /* test for truncation needs to be done while range locked */ 1094 if (offset >= zp->z_size) { 1095 error = SET_ERROR(ENOENT); 1096 } else { 1097 error = dmu_read(os, object, offset, size, buf, 1098 DMU_READ_NO_PREFETCH); 1099 } 1100 ASSERT(error == 0 || error == ENOENT); 1101 } else { /* indirect write */ 1102 /* 1103 * Have to lock the whole block to ensure when it's 1104 * written out and its checksum is being calculated 1105 * that no one can change the data. We need to re-check 1106 * blocksize after we get the lock in case it's changed! 1107 */ 1108 for (;;) { 1109 uint64_t blkoff; 1110 size = zp->z_blksz; 1111 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset; 1112 offset -= blkoff; 1113 zgd->zgd_rl = zfs_range_lock(zp, offset, size, 1114 RL_READER); 1115 if (zp->z_blksz == size) 1116 break; 1117 offset += blkoff; 1118 zfs_range_unlock(zgd->zgd_rl); 1119 } 1120 /* test for truncation needs to be done while range locked */ 1121 if (lr->lr_offset >= zp->z_size) 1122 error = SET_ERROR(ENOENT); 1123 #ifdef DEBUG 1124 if (zil_fault_io) { 1125 error = SET_ERROR(EIO); 1126 zil_fault_io = 0; 1127 } 1128 #endif 1129 if (error == 0) 1130 error = dmu_buf_hold(os, object, offset, zgd, &db, 1131 DMU_READ_NO_PREFETCH); 1132 1133 if (error == 0) { 1134 blkptr_t *bp = &lr->lr_blkptr; 1135 1136 zgd->zgd_db = db; 1137 zgd->zgd_bp = bp; 1138 1139 ASSERT(db->db_offset == offset); 1140 ASSERT(db->db_size == size); 1141 1142 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1143 zfs_get_done, zgd); 1144 ASSERT(error || lr->lr_length <= size); 1145 1146 /* 1147 * On success, we need to wait for the write I/O 1148 * initiated by dmu_sync() to complete before we can 1149 * release this dbuf. We will finish everything up 1150 * in the zfs_get_done() callback. 1151 */ 1152 if (error == 0) 1153 return (0); 1154 1155 if (error == EALREADY) { 1156 lr->lr_common.lrc_txtype = TX_WRITE2; 1157 /* 1158 * TX_WRITE2 relies on the data previously 1159 * written by the TX_WRITE that caused 1160 * EALREADY. We zero out the BP because 1161 * it is the old, currently-on-disk BP, 1162 * so there's no need to zio_flush() its 1163 * vdevs (flushing would needlesly hurt 1164 * performance, and doesn't work on 1165 * indirect vdevs). 1166 */ 1167 zgd->zgd_bp = NULL; 1168 BP_ZERO(bp); 1169 error = 0; 1170 } 1171 } 1172 } 1173 1174 zfs_get_done(zgd, error); 1175 1176 return (error); 1177 } 1178 1179 /*ARGSUSED*/ 1180 static int 1181 zfs_access(vnode_t *vp, int mode, int flag, cred_t *cr, 1182 caller_context_t *ct) 1183 { 1184 znode_t *zp = VTOZ(vp); 1185 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1186 int error; 1187 1188 ZFS_ENTER(zfsvfs); 1189 ZFS_VERIFY_ZP(zp); 1190 1191 if (flag & V_ACE_MASK) 1192 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr); 1193 else 1194 error = zfs_zaccess_rwx(zp, mode, flag, cr); 1195 1196 ZFS_EXIT(zfsvfs); 1197 return (error); 1198 } 1199 1200 /* 1201 * If vnode is for a device return a specfs vnode instead. 1202 */ 1203 static int 1204 specvp_check(vnode_t **vpp, cred_t *cr) 1205 { 1206 int error = 0; 1207 1208 if (IS_DEVVP(*vpp)) { 1209 struct vnode *svp; 1210 1211 svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr); 1212 VN_RELE(*vpp); 1213 if (svp == NULL) 1214 error = SET_ERROR(ENOSYS); 1215 *vpp = svp; 1216 } 1217 return (error); 1218 } 1219 1220 1221 /* 1222 * Lookup an entry in a directory, or an extended attribute directory. 1223 * If it exists, return a held vnode reference for it. 1224 * 1225 * IN: dvp - vnode of directory to search. 1226 * nm - name of entry to lookup. 1227 * pnp - full pathname to lookup [UNUSED]. 1228 * flags - LOOKUP_XATTR set if looking for an attribute. 1229 * rdir - root directory vnode [UNUSED]. 1230 * cr - credentials of caller. 1231 * ct - caller context 1232 * direntflags - directory lookup flags 1233 * realpnp - returned pathname. 1234 * 1235 * OUT: vpp - vnode of located entry, NULL if not found. 1236 * 1237 * RETURN: 0 on success, error code on failure. 1238 * 1239 * Timestamps: 1240 * NA 1241 */ 1242 /* ARGSUSED */ 1243 static int 1244 zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp, 1245 int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct, 1246 int *direntflags, pathname_t *realpnp) 1247 { 1248 znode_t *zdp = VTOZ(dvp); 1249 zfsvfs_t *zfsvfs = zdp->z_zfsvfs; 1250 int error = 0; 1251 1252 /* 1253 * Fast path lookup, however we must skip DNLC lookup 1254 * for case folding or normalizing lookups because the 1255 * DNLC code only stores the passed in name. This means 1256 * creating 'a' and removing 'A' on a case insensitive 1257 * file system would work, but DNLC still thinks 'a' 1258 * exists and won't let you create it again on the next 1259 * pass through fast path. 1260 */ 1261 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) { 1262 1263 if (dvp->v_type != VDIR) { 1264 return (SET_ERROR(ENOTDIR)); 1265 } else if (zdp->z_sa_hdl == NULL) { 1266 return (SET_ERROR(EIO)); 1267 } 1268 1269 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) { 1270 error = zfs_fastaccesschk_execute(zdp, cr); 1271 if (!error) { 1272 *vpp = dvp; 1273 VN_HOLD(*vpp); 1274 return (0); 1275 } 1276 return (error); 1277 } else if (!zdp->z_zfsvfs->z_norm && 1278 (zdp->z_zfsvfs->z_case == ZFS_CASE_SENSITIVE)) { 1279 1280 vnode_t *tvp = dnlc_lookup(dvp, nm); 1281 1282 if (tvp) { 1283 error = zfs_fastaccesschk_execute(zdp, cr); 1284 if (error) { 1285 VN_RELE(tvp); 1286 return (error); 1287 } 1288 if (tvp == DNLC_NO_VNODE) { 1289 VN_RELE(tvp); 1290 return (SET_ERROR(ENOENT)); 1291 } else { 1292 *vpp = tvp; 1293 return (specvp_check(vpp, cr)); 1294 } 1295 } 1296 } 1297 } 1298 1299 DTRACE_PROBE2(zfs__fastpath__lookup__miss, vnode_t *, dvp, char *, nm); 1300 1301 ZFS_ENTER(zfsvfs); 1302 ZFS_VERIFY_ZP(zdp); 1303 1304 *vpp = NULL; 1305 1306 if (flags & LOOKUP_XATTR) { 1307 /* 1308 * If the xattr property is off, refuse the lookup request. 1309 */ 1310 if (!(zfsvfs->z_vfs->vfs_flag & VFS_XATTR)) { 1311 ZFS_EXIT(zfsvfs); 1312 return (SET_ERROR(EINVAL)); 1313 } 1314 1315 /* 1316 * We don't allow recursive attributes.. 1317 * Maybe someday we will. 1318 */ 1319 if (zdp->z_pflags & ZFS_XATTR) { 1320 ZFS_EXIT(zfsvfs); 1321 return (SET_ERROR(EINVAL)); 1322 } 1323 1324 if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr, flags)) { 1325 ZFS_EXIT(zfsvfs); 1326 return (error); 1327 } 1328 1329 /* 1330 * Do we have permission to get into attribute directory? 1331 */ 1332 1333 if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, 0, 1334 B_FALSE, cr)) { 1335 VN_RELE(*vpp); 1336 *vpp = NULL; 1337 } 1338 1339 ZFS_EXIT(zfsvfs); 1340 return (error); 1341 } 1342 1343 if (dvp->v_type != VDIR) { 1344 ZFS_EXIT(zfsvfs); 1345 return (SET_ERROR(ENOTDIR)); 1346 } 1347 1348 /* 1349 * Check accessibility of directory. 1350 */ 1351 1352 if (error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr)) { 1353 ZFS_EXIT(zfsvfs); 1354 return (error); 1355 } 1356 1357 if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm), 1358 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 1359 ZFS_EXIT(zfsvfs); 1360 return (SET_ERROR(EILSEQ)); 1361 } 1362 1363 error = zfs_dirlook(zdp, nm, vpp, flags, direntflags, realpnp); 1364 if (error == 0) 1365 error = specvp_check(vpp, cr); 1366 1367 ZFS_EXIT(zfsvfs); 1368 return (error); 1369 } 1370 1371 /* 1372 * Attempt to create a new entry in a directory. If the entry 1373 * already exists, truncate the file if permissible, else return 1374 * an error. Return the vp of the created or trunc'd file. 1375 * 1376 * IN: dvp - vnode of directory to put new file entry in. 1377 * name - name of new file entry. 1378 * vap - attributes of new file. 1379 * excl - flag indicating exclusive or non-exclusive mode. 1380 * mode - mode to open file with. 1381 * cr - credentials of caller. 1382 * flag - large file flag [UNUSED]. 1383 * ct - caller context 1384 * vsecp - ACL to be set 1385 * 1386 * OUT: vpp - vnode of created or trunc'd entry. 1387 * 1388 * RETURN: 0 on success, error code on failure. 1389 * 1390 * Timestamps: 1391 * dvp - ctime|mtime updated if new entry created 1392 * vp - ctime|mtime always, atime if new 1393 */ 1394 1395 /* ARGSUSED */ 1396 static int 1397 zfs_create(vnode_t *dvp, char *name, vattr_t *vap, vcexcl_t excl, 1398 int mode, vnode_t **vpp, cred_t *cr, int flag, caller_context_t *ct, 1399 vsecattr_t *vsecp) 1400 { 1401 znode_t *zp, *dzp = VTOZ(dvp); 1402 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1403 zilog_t *zilog; 1404 objset_t *os; 1405 zfs_dirlock_t *dl; 1406 dmu_tx_t *tx; 1407 int error; 1408 ksid_t *ksid; 1409 uid_t uid; 1410 gid_t gid = crgetgid(cr); 1411 zfs_acl_ids_t acl_ids; 1412 boolean_t fuid_dirtied; 1413 boolean_t have_acl = B_FALSE; 1414 boolean_t waited = B_FALSE; 1415 1416 /* 1417 * If we have an ephemeral id, ACL, or XVATTR then 1418 * make sure file system is at proper version 1419 */ 1420 1421 ksid = crgetsid(cr, KSID_OWNER); 1422 if (ksid) 1423 uid = ksid_getid(ksid); 1424 else 1425 uid = crgetuid(cr); 1426 1427 if (zfsvfs->z_use_fuids == B_FALSE && 1428 (vsecp || (vap->va_mask & AT_XVATTR) || 1429 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid))) 1430 return (SET_ERROR(EINVAL)); 1431 1432 ZFS_ENTER(zfsvfs); 1433 ZFS_VERIFY_ZP(dzp); 1434 os = zfsvfs->z_os; 1435 zilog = zfsvfs->z_log; 1436 1437 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name), 1438 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 1439 ZFS_EXIT(zfsvfs); 1440 return (SET_ERROR(EILSEQ)); 1441 } 1442 1443 if (vap->va_mask & AT_XVATTR) { 1444 if ((error = secpolicy_xvattr((xvattr_t *)vap, 1445 crgetuid(cr), cr, vap->va_type)) != 0) { 1446 ZFS_EXIT(zfsvfs); 1447 return (error); 1448 } 1449 } 1450 top: 1451 *vpp = NULL; 1452 1453 if ((vap->va_mode & VSVTX) && secpolicy_vnode_stky_modify(cr)) 1454 vap->va_mode &= ~VSVTX; 1455 1456 if (*name == '\0') { 1457 /* 1458 * Null component name refers to the directory itself. 1459 */ 1460 VN_HOLD(dvp); 1461 zp = dzp; 1462 dl = NULL; 1463 error = 0; 1464 } else { 1465 /* possible VN_HOLD(zp) */ 1466 int zflg = 0; 1467 1468 if (flag & FIGNORECASE) 1469 zflg |= ZCILOOK; 1470 1471 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 1472 NULL, NULL); 1473 if (error) { 1474 if (have_acl) 1475 zfs_acl_ids_free(&acl_ids); 1476 if (strcmp(name, "..") == 0) 1477 error = SET_ERROR(EISDIR); 1478 ZFS_EXIT(zfsvfs); 1479 return (error); 1480 } 1481 } 1482 1483 if (zp == NULL) { 1484 uint64_t txtype; 1485 1486 /* 1487 * Create a new file object and update the directory 1488 * to reference it. 1489 */ 1490 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 1491 if (have_acl) 1492 zfs_acl_ids_free(&acl_ids); 1493 goto out; 1494 } 1495 1496 /* 1497 * We only support the creation of regular files in 1498 * extended attribute directories. 1499 */ 1500 1501 if ((dzp->z_pflags & ZFS_XATTR) && 1502 (vap->va_type != VREG)) { 1503 if (have_acl) 1504 zfs_acl_ids_free(&acl_ids); 1505 error = SET_ERROR(EINVAL); 1506 goto out; 1507 } 1508 1509 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap, 1510 cr, vsecp, &acl_ids)) != 0) 1511 goto out; 1512 have_acl = B_TRUE; 1513 1514 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 1515 zfs_acl_ids_free(&acl_ids); 1516 error = SET_ERROR(EDQUOT); 1517 goto out; 1518 } 1519 1520 tx = dmu_tx_create(os); 1521 1522 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 1523 ZFS_SA_BASE_ATTR_SIZE); 1524 1525 fuid_dirtied = zfsvfs->z_fuid_dirty; 1526 if (fuid_dirtied) 1527 zfs_fuid_txhold(zfsvfs, tx); 1528 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 1529 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); 1530 if (!zfsvfs->z_use_sa && 1531 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1532 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 1533 0, acl_ids.z_aclp->z_acl_bytes); 1534 } 1535 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 1536 if (error) { 1537 zfs_dirent_unlock(dl); 1538 if (error == ERESTART) { 1539 waited = B_TRUE; 1540 dmu_tx_wait(tx); 1541 dmu_tx_abort(tx); 1542 goto top; 1543 } 1544 zfs_acl_ids_free(&acl_ids); 1545 dmu_tx_abort(tx); 1546 ZFS_EXIT(zfsvfs); 1547 return (error); 1548 } 1549 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 1550 1551 if (fuid_dirtied) 1552 zfs_fuid_sync(zfsvfs, tx); 1553 1554 (void) zfs_link_create(dl, zp, tx, ZNEW); 1555 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap); 1556 if (flag & FIGNORECASE) 1557 txtype |= TX_CI; 1558 zfs_log_create(zilog, tx, txtype, dzp, zp, name, 1559 vsecp, acl_ids.z_fuidp, vap); 1560 zfs_acl_ids_free(&acl_ids); 1561 dmu_tx_commit(tx); 1562 } else { 1563 int aflags = (flag & FAPPEND) ? V_APPEND : 0; 1564 1565 if (have_acl) 1566 zfs_acl_ids_free(&acl_ids); 1567 have_acl = B_FALSE; 1568 1569 /* 1570 * A directory entry already exists for this name. 1571 */ 1572 /* 1573 * Can't truncate an existing file if in exclusive mode. 1574 */ 1575 if (excl == EXCL) { 1576 error = SET_ERROR(EEXIST); 1577 goto out; 1578 } 1579 /* 1580 * Can't open a directory for writing. 1581 */ 1582 if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) { 1583 error = SET_ERROR(EISDIR); 1584 goto out; 1585 } 1586 /* 1587 * Verify requested access to file. 1588 */ 1589 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) { 1590 goto out; 1591 } 1592 1593 mutex_enter(&dzp->z_lock); 1594 dzp->z_seq++; 1595 mutex_exit(&dzp->z_lock); 1596 1597 /* 1598 * Truncate regular files if requested. 1599 */ 1600 if ((ZTOV(zp)->v_type == VREG) && 1601 (vap->va_mask & AT_SIZE) && (vap->va_size == 0)) { 1602 /* we can't hold any locks when calling zfs_freesp() */ 1603 zfs_dirent_unlock(dl); 1604 dl = NULL; 1605 error = zfs_freesp(zp, 0, 0, mode, TRUE); 1606 if (error == 0) { 1607 vnevent_create(ZTOV(zp), ct); 1608 } 1609 } 1610 } 1611 out: 1612 1613 if (dl) 1614 zfs_dirent_unlock(dl); 1615 1616 if (error) { 1617 if (zp) 1618 VN_RELE(ZTOV(zp)); 1619 } else { 1620 *vpp = ZTOV(zp); 1621 error = specvp_check(vpp, cr); 1622 } 1623 1624 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 1625 zil_commit(zilog, 0); 1626 1627 ZFS_EXIT(zfsvfs); 1628 return (error); 1629 } 1630 1631 /* 1632 * Remove an entry from a directory. 1633 * 1634 * IN: dvp - vnode of directory to remove entry from. 1635 * name - name of entry to remove. 1636 * cr - credentials of caller. 1637 * ct - caller context 1638 * flags - case flags 1639 * 1640 * RETURN: 0 on success, error code on failure. 1641 * 1642 * Timestamps: 1643 * dvp - ctime|mtime 1644 * vp - ctime (if nlink > 0) 1645 */ 1646 1647 uint64_t null_xattr = 0; 1648 1649 /*ARGSUSED*/ 1650 static int 1651 zfs_remove(vnode_t *dvp, char *name, cred_t *cr, caller_context_t *ct, 1652 int flags) 1653 { 1654 znode_t *zp, *dzp = VTOZ(dvp); 1655 znode_t *xzp; 1656 vnode_t *vp; 1657 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1658 zilog_t *zilog; 1659 uint64_t acl_obj, xattr_obj; 1660 uint64_t xattr_obj_unlinked = 0; 1661 uint64_t obj = 0; 1662 zfs_dirlock_t *dl; 1663 dmu_tx_t *tx; 1664 boolean_t may_delete_now, delete_now = FALSE; 1665 boolean_t unlinked, toobig = FALSE; 1666 uint64_t txtype; 1667 pathname_t *realnmp = NULL; 1668 pathname_t realnm; 1669 int error; 1670 int zflg = ZEXISTS; 1671 boolean_t waited = B_FALSE; 1672 1673 ZFS_ENTER(zfsvfs); 1674 ZFS_VERIFY_ZP(dzp); 1675 zilog = zfsvfs->z_log; 1676 1677 if (flags & FIGNORECASE) { 1678 zflg |= ZCILOOK; 1679 pn_alloc(&realnm); 1680 realnmp = &realnm; 1681 } 1682 1683 top: 1684 xattr_obj = 0; 1685 xzp = NULL; 1686 /* 1687 * Attempt to lock directory; fail if entry doesn't exist. 1688 */ 1689 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 1690 NULL, realnmp)) { 1691 if (realnmp) 1692 pn_free(realnmp); 1693 ZFS_EXIT(zfsvfs); 1694 return (error); 1695 } 1696 1697 vp = ZTOV(zp); 1698 1699 if (error = zfs_zaccess_delete(dzp, zp, cr)) { 1700 goto out; 1701 } 1702 1703 /* 1704 * Need to use rmdir for removing directories. 1705 */ 1706 if (vp->v_type == VDIR) { 1707 error = SET_ERROR(EPERM); 1708 goto out; 1709 } 1710 1711 vnevent_remove(vp, dvp, name, ct); 1712 1713 if (realnmp) 1714 dnlc_remove(dvp, realnmp->pn_buf); 1715 else 1716 dnlc_remove(dvp, name); 1717 1718 mutex_enter(&vp->v_lock); 1719 may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp); 1720 mutex_exit(&vp->v_lock); 1721 1722 /* 1723 * We may delete the znode now, or we may put it in the unlinked set; 1724 * it depends on whether we're the last link, and on whether there are 1725 * other holds on the vnode. So we dmu_tx_hold() the right things to 1726 * allow for either case. 1727 */ 1728 obj = zp->z_id; 1729 tx = dmu_tx_create(zfsvfs->z_os); 1730 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name); 1731 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1732 zfs_sa_upgrade_txholds(tx, zp); 1733 zfs_sa_upgrade_txholds(tx, dzp); 1734 if (may_delete_now) { 1735 toobig = 1736 zp->z_size > zp->z_blksz * DMU_MAX_DELETEBLKCNT; 1737 /* if the file is too big, only hold_free a token amount */ 1738 dmu_tx_hold_free(tx, zp->z_id, 0, 1739 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END)); 1740 } 1741 1742 /* are there any extended attributes? */ 1743 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 1744 &xattr_obj, sizeof (xattr_obj)); 1745 if (error == 0 && xattr_obj) { 1746 error = zfs_zget(zfsvfs, xattr_obj, &xzp); 1747 ASSERT0(error); 1748 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 1749 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); 1750 } 1751 1752 mutex_enter(&zp->z_lock); 1753 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now) 1754 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); 1755 mutex_exit(&zp->z_lock); 1756 1757 /* charge as an update -- would be nice not to charge at all */ 1758 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 1759 1760 /* 1761 * Mark this transaction as typically resulting in a net free of space 1762 */ 1763 dmu_tx_mark_netfree(tx); 1764 1765 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 1766 if (error) { 1767 zfs_dirent_unlock(dl); 1768 VN_RELE(vp); 1769 if (xzp) 1770 VN_RELE(ZTOV(xzp)); 1771 if (error == ERESTART) { 1772 waited = B_TRUE; 1773 dmu_tx_wait(tx); 1774 dmu_tx_abort(tx); 1775 goto top; 1776 } 1777 if (realnmp) 1778 pn_free(realnmp); 1779 dmu_tx_abort(tx); 1780 ZFS_EXIT(zfsvfs); 1781 return (error); 1782 } 1783 1784 /* 1785 * Remove the directory entry. 1786 */ 1787 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked); 1788 1789 if (error) { 1790 dmu_tx_commit(tx); 1791 goto out; 1792 } 1793 1794 if (unlinked) { 1795 /* 1796 * Hold z_lock so that we can make sure that the ACL obj 1797 * hasn't changed. Could have been deleted due to 1798 * zfs_sa_upgrade(). 1799 */ 1800 mutex_enter(&zp->z_lock); 1801 mutex_enter(&vp->v_lock); 1802 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 1803 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked)); 1804 delete_now = may_delete_now && !toobig && 1805 vp->v_count == 1 && !vn_has_cached_data(vp) && 1806 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) == 1807 acl_obj; 1808 mutex_exit(&vp->v_lock); 1809 } 1810 1811 if (delete_now) { 1812 if (xattr_obj_unlinked) { 1813 ASSERT3U(xzp->z_links, ==, 2); 1814 mutex_enter(&xzp->z_lock); 1815 xzp->z_unlinked = 1; 1816 xzp->z_links = 0; 1817 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs), 1818 &xzp->z_links, sizeof (xzp->z_links), tx); 1819 ASSERT3U(error, ==, 0); 1820 mutex_exit(&xzp->z_lock); 1821 zfs_unlinked_add(xzp, tx); 1822 1823 if (zp->z_is_sa) 1824 error = sa_remove(zp->z_sa_hdl, 1825 SA_ZPL_XATTR(zfsvfs), tx); 1826 else 1827 error = sa_update(zp->z_sa_hdl, 1828 SA_ZPL_XATTR(zfsvfs), &null_xattr, 1829 sizeof (uint64_t), tx); 1830 ASSERT0(error); 1831 } 1832 mutex_enter(&vp->v_lock); 1833 VN_RELE_LOCKED(vp); 1834 ASSERT0(vp->v_count); 1835 mutex_exit(&vp->v_lock); 1836 mutex_exit(&zp->z_lock); 1837 zfs_znode_delete(zp, tx); 1838 } else if (unlinked) { 1839 mutex_exit(&zp->z_lock); 1840 zfs_unlinked_add(zp, tx); 1841 } 1842 1843 txtype = TX_REMOVE; 1844 if (flags & FIGNORECASE) 1845 txtype |= TX_CI; 1846 zfs_log_remove(zilog, tx, txtype, dzp, name, obj); 1847 1848 dmu_tx_commit(tx); 1849 out: 1850 if (realnmp) 1851 pn_free(realnmp); 1852 1853 zfs_dirent_unlock(dl); 1854 1855 if (!delete_now) 1856 VN_RELE(vp); 1857 if (xzp) 1858 VN_RELE(ZTOV(xzp)); 1859 1860 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 1861 zil_commit(zilog, 0); 1862 1863 ZFS_EXIT(zfsvfs); 1864 return (error); 1865 } 1866 1867 /* 1868 * Create a new directory and insert it into dvp using the name 1869 * provided. Return a pointer to the inserted directory. 1870 * 1871 * IN: dvp - vnode of directory to add subdir to. 1872 * dirname - name of new directory. 1873 * vap - attributes of new directory. 1874 * cr - credentials of caller. 1875 * ct - caller context 1876 * flags - case flags 1877 * vsecp - ACL to be set 1878 * 1879 * OUT: vpp - vnode of created directory. 1880 * 1881 * RETURN: 0 on success, error code on failure. 1882 * 1883 * Timestamps: 1884 * dvp - ctime|mtime updated 1885 * vp - ctime|mtime|atime updated 1886 */ 1887 /*ARGSUSED*/ 1888 static int 1889 zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr, 1890 caller_context_t *ct, int flags, vsecattr_t *vsecp) 1891 { 1892 znode_t *zp, *dzp = VTOZ(dvp); 1893 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 1894 zilog_t *zilog; 1895 zfs_dirlock_t *dl; 1896 uint64_t txtype; 1897 dmu_tx_t *tx; 1898 int error; 1899 int zf = ZNEW; 1900 ksid_t *ksid; 1901 uid_t uid; 1902 gid_t gid = crgetgid(cr); 1903 zfs_acl_ids_t acl_ids; 1904 boolean_t fuid_dirtied; 1905 boolean_t waited = B_FALSE; 1906 1907 ASSERT(vap->va_type == VDIR); 1908 1909 /* 1910 * If we have an ephemeral id, ACL, or XVATTR then 1911 * make sure file system is at proper version 1912 */ 1913 1914 ksid = crgetsid(cr, KSID_OWNER); 1915 if (ksid) 1916 uid = ksid_getid(ksid); 1917 else 1918 uid = crgetuid(cr); 1919 if (zfsvfs->z_use_fuids == B_FALSE && 1920 (vsecp || (vap->va_mask & AT_XVATTR) || 1921 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid))) 1922 return (SET_ERROR(EINVAL)); 1923 1924 ZFS_ENTER(zfsvfs); 1925 ZFS_VERIFY_ZP(dzp); 1926 zilog = zfsvfs->z_log; 1927 1928 if (dzp->z_pflags & ZFS_XATTR) { 1929 ZFS_EXIT(zfsvfs); 1930 return (SET_ERROR(EINVAL)); 1931 } 1932 1933 if (zfsvfs->z_utf8 && u8_validate(dirname, 1934 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 1935 ZFS_EXIT(zfsvfs); 1936 return (SET_ERROR(EILSEQ)); 1937 } 1938 if (flags & FIGNORECASE) 1939 zf |= ZCILOOK; 1940 1941 if (vap->va_mask & AT_XVATTR) { 1942 if ((error = secpolicy_xvattr((xvattr_t *)vap, 1943 crgetuid(cr), cr, vap->va_type)) != 0) { 1944 ZFS_EXIT(zfsvfs); 1945 return (error); 1946 } 1947 } 1948 1949 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr, 1950 vsecp, &acl_ids)) != 0) { 1951 ZFS_EXIT(zfsvfs); 1952 return (error); 1953 } 1954 /* 1955 * First make sure the new directory doesn't exist. 1956 * 1957 * Existence is checked first to make sure we don't return 1958 * EACCES instead of EEXIST which can cause some applications 1959 * to fail. 1960 */ 1961 top: 1962 *vpp = NULL; 1963 1964 if (error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf, 1965 NULL, NULL)) { 1966 zfs_acl_ids_free(&acl_ids); 1967 ZFS_EXIT(zfsvfs); 1968 return (error); 1969 } 1970 1971 if (error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr)) { 1972 zfs_acl_ids_free(&acl_ids); 1973 zfs_dirent_unlock(dl); 1974 ZFS_EXIT(zfsvfs); 1975 return (error); 1976 } 1977 1978 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 1979 zfs_acl_ids_free(&acl_ids); 1980 zfs_dirent_unlock(dl); 1981 ZFS_EXIT(zfsvfs); 1982 return (SET_ERROR(EDQUOT)); 1983 } 1984 1985 /* 1986 * Add a new entry to the directory. 1987 */ 1988 tx = dmu_tx_create(zfsvfs->z_os); 1989 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname); 1990 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 1991 fuid_dirtied = zfsvfs->z_fuid_dirty; 1992 if (fuid_dirtied) 1993 zfs_fuid_txhold(zfsvfs, tx); 1994 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 1995 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 1996 acl_ids.z_aclp->z_acl_bytes); 1997 } 1998 1999 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 2000 ZFS_SA_BASE_ATTR_SIZE); 2001 2002 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 2003 if (error) { 2004 zfs_dirent_unlock(dl); 2005 if (error == ERESTART) { 2006 waited = B_TRUE; 2007 dmu_tx_wait(tx); 2008 dmu_tx_abort(tx); 2009 goto top; 2010 } 2011 zfs_acl_ids_free(&acl_ids); 2012 dmu_tx_abort(tx); 2013 ZFS_EXIT(zfsvfs); 2014 return (error); 2015 } 2016 2017 /* 2018 * Create new node. 2019 */ 2020 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 2021 2022 if (fuid_dirtied) 2023 zfs_fuid_sync(zfsvfs, tx); 2024 2025 /* 2026 * Now put new name in parent dir. 2027 */ 2028 (void) zfs_link_create(dl, zp, tx, ZNEW); 2029 2030 *vpp = ZTOV(zp); 2031 2032 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap); 2033 if (flags & FIGNORECASE) 2034 txtype |= TX_CI; 2035 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp, 2036 acl_ids.z_fuidp, vap); 2037 2038 zfs_acl_ids_free(&acl_ids); 2039 2040 dmu_tx_commit(tx); 2041 2042 zfs_dirent_unlock(dl); 2043 2044 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2045 zil_commit(zilog, 0); 2046 2047 ZFS_EXIT(zfsvfs); 2048 return (0); 2049 } 2050 2051 /* 2052 * Remove a directory subdir entry. If the current working 2053 * directory is the same as the subdir to be removed, the 2054 * remove will fail. 2055 * 2056 * IN: dvp - vnode of directory to remove from. 2057 * name - name of directory to be removed. 2058 * cwd - vnode of current working directory. 2059 * cr - credentials of caller. 2060 * ct - caller context 2061 * flags - case flags 2062 * 2063 * RETURN: 0 on success, error code on failure. 2064 * 2065 * Timestamps: 2066 * dvp - ctime|mtime updated 2067 */ 2068 /*ARGSUSED*/ 2069 static int 2070 zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr, 2071 caller_context_t *ct, int flags) 2072 { 2073 znode_t *dzp = VTOZ(dvp); 2074 znode_t *zp; 2075 vnode_t *vp; 2076 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 2077 zilog_t *zilog; 2078 zfs_dirlock_t *dl; 2079 dmu_tx_t *tx; 2080 int error; 2081 int zflg = ZEXISTS; 2082 boolean_t waited = B_FALSE; 2083 2084 ZFS_ENTER(zfsvfs); 2085 ZFS_VERIFY_ZP(dzp); 2086 zilog = zfsvfs->z_log; 2087 2088 if (flags & FIGNORECASE) 2089 zflg |= ZCILOOK; 2090 top: 2091 zp = NULL; 2092 2093 /* 2094 * Attempt to lock directory; fail if entry doesn't exist. 2095 */ 2096 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, 2097 NULL, NULL)) { 2098 ZFS_EXIT(zfsvfs); 2099 return (error); 2100 } 2101 2102 vp = ZTOV(zp); 2103 2104 if (error = zfs_zaccess_delete(dzp, zp, cr)) { 2105 goto out; 2106 } 2107 2108 if (vp->v_type != VDIR) { 2109 error = SET_ERROR(ENOTDIR); 2110 goto out; 2111 } 2112 2113 if (vp == cwd) { 2114 error = SET_ERROR(EINVAL); 2115 goto out; 2116 } 2117 2118 vnevent_rmdir(vp, dvp, name, ct); 2119 2120 /* 2121 * Grab a lock on the directory to make sure that noone is 2122 * trying to add (or lookup) entries while we are removing it. 2123 */ 2124 rw_enter(&zp->z_name_lock, RW_WRITER); 2125 2126 /* 2127 * Grab a lock on the parent pointer to make sure we play well 2128 * with the treewalk and directory rename code. 2129 */ 2130 rw_enter(&zp->z_parent_lock, RW_WRITER); 2131 2132 tx = dmu_tx_create(zfsvfs->z_os); 2133 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name); 2134 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 2135 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 2136 zfs_sa_upgrade_txholds(tx, zp); 2137 zfs_sa_upgrade_txholds(tx, dzp); 2138 dmu_tx_mark_netfree(tx); 2139 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 2140 if (error) { 2141 rw_exit(&zp->z_parent_lock); 2142 rw_exit(&zp->z_name_lock); 2143 zfs_dirent_unlock(dl); 2144 VN_RELE(vp); 2145 if (error == ERESTART) { 2146 waited = B_TRUE; 2147 dmu_tx_wait(tx); 2148 dmu_tx_abort(tx); 2149 goto top; 2150 } 2151 dmu_tx_abort(tx); 2152 ZFS_EXIT(zfsvfs); 2153 return (error); 2154 } 2155 2156 error = zfs_link_destroy(dl, zp, tx, zflg, NULL); 2157 2158 if (error == 0) { 2159 uint64_t txtype = TX_RMDIR; 2160 if (flags & FIGNORECASE) 2161 txtype |= TX_CI; 2162 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT); 2163 } 2164 2165 dmu_tx_commit(tx); 2166 2167 rw_exit(&zp->z_parent_lock); 2168 rw_exit(&zp->z_name_lock); 2169 out: 2170 zfs_dirent_unlock(dl); 2171 2172 VN_RELE(vp); 2173 2174 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 2175 zil_commit(zilog, 0); 2176 2177 ZFS_EXIT(zfsvfs); 2178 return (error); 2179 } 2180 2181 /* 2182 * Read as many directory entries as will fit into the provided 2183 * buffer from the given directory cursor position (specified in 2184 * the uio structure). 2185 * 2186 * IN: vp - vnode of directory to read. 2187 * uio - structure supplying read location, range info, 2188 * and return buffer. 2189 * cr - credentials of caller. 2190 * ct - caller context 2191 * flags - case flags 2192 * 2193 * OUT: uio - updated offset and range, buffer filled. 2194 * eofp - set to true if end-of-file detected. 2195 * 2196 * RETURN: 0 on success, error code on failure. 2197 * 2198 * Timestamps: 2199 * vp - atime updated 2200 * 2201 * Note that the low 4 bits of the cookie returned by zap is always zero. 2202 * This allows us to use the low range for "special" directory entries: 2203 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem, 2204 * we use the offset 2 for the '.zfs' directory. 2205 */ 2206 /* ARGSUSED */ 2207 static int 2208 zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp, 2209 caller_context_t *ct, int flags) 2210 { 2211 znode_t *zp = VTOZ(vp); 2212 iovec_t *iovp; 2213 edirent_t *eodp; 2214 dirent64_t *odp; 2215 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2216 objset_t *os; 2217 caddr_t outbuf; 2218 size_t bufsize; 2219 zap_cursor_t zc; 2220 zap_attribute_t zap; 2221 uint_t bytes_wanted; 2222 uint64_t offset; /* must be unsigned; checks for < 1 */ 2223 uint64_t parent; 2224 int local_eof; 2225 int outcount; 2226 int error; 2227 uint8_t prefetch; 2228 boolean_t check_sysattrs; 2229 2230 ZFS_ENTER(zfsvfs); 2231 ZFS_VERIFY_ZP(zp); 2232 2233 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), 2234 &parent, sizeof (parent))) != 0) { 2235 ZFS_EXIT(zfsvfs); 2236 return (error); 2237 } 2238 2239 /* 2240 * If we are not given an eof variable, 2241 * use a local one. 2242 */ 2243 if (eofp == NULL) 2244 eofp = &local_eof; 2245 2246 /* 2247 * Check for valid iov_len. 2248 */ 2249 if (uio->uio_iov->iov_len <= 0) { 2250 ZFS_EXIT(zfsvfs); 2251 return (SET_ERROR(EINVAL)); 2252 } 2253 2254 /* 2255 * Quit if directory has been removed (posix) 2256 */ 2257 if ((*eofp = zp->z_unlinked) != 0) { 2258 ZFS_EXIT(zfsvfs); 2259 return (0); 2260 } 2261 2262 error = 0; 2263 os = zfsvfs->z_os; 2264 offset = uio->uio_loffset; 2265 prefetch = zp->z_zn_prefetch; 2266 2267 /* 2268 * Initialize the iterator cursor. 2269 */ 2270 if (offset <= 3) { 2271 /* 2272 * Start iteration from the beginning of the directory. 2273 */ 2274 zap_cursor_init(&zc, os, zp->z_id); 2275 } else { 2276 /* 2277 * The offset is a serialized cursor. 2278 */ 2279 zap_cursor_init_serialized(&zc, os, zp->z_id, offset); 2280 } 2281 2282 /* 2283 * Get space to change directory entries into fs independent format. 2284 */ 2285 iovp = uio->uio_iov; 2286 bytes_wanted = iovp->iov_len; 2287 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) { 2288 bufsize = bytes_wanted; 2289 outbuf = kmem_alloc(bufsize, KM_SLEEP); 2290 odp = (struct dirent64 *)outbuf; 2291 } else { 2292 bufsize = bytes_wanted; 2293 outbuf = NULL; 2294 odp = (struct dirent64 *)iovp->iov_base; 2295 } 2296 eodp = (struct edirent *)odp; 2297 2298 /* 2299 * If this VFS supports the system attribute view interface; and 2300 * we're looking at an extended attribute directory; and we care 2301 * about normalization conflicts on this vfs; then we must check 2302 * for normalization conflicts with the sysattr name space. 2303 */ 2304 check_sysattrs = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) && 2305 (vp->v_flag & V_XATTRDIR) && zfsvfs->z_norm && 2306 (flags & V_RDDIR_ENTFLAGS); 2307 2308 /* 2309 * Transform to file-system independent format 2310 */ 2311 outcount = 0; 2312 while (outcount < bytes_wanted) { 2313 ino64_t objnum; 2314 ushort_t reclen; 2315 off64_t *next = NULL; 2316 2317 /* 2318 * Special case `.', `..', and `.zfs'. 2319 */ 2320 if (offset == 0) { 2321 (void) strcpy(zap.za_name, "."); 2322 zap.za_normalization_conflict = 0; 2323 objnum = zp->z_id; 2324 } else if (offset == 1) { 2325 (void) strcpy(zap.za_name, ".."); 2326 zap.za_normalization_conflict = 0; 2327 objnum = parent; 2328 } else if (offset == 2 && zfs_show_ctldir(zp)) { 2329 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME); 2330 zap.za_normalization_conflict = 0; 2331 objnum = ZFSCTL_INO_ROOT; 2332 } else { 2333 /* 2334 * Grab next entry. 2335 */ 2336 if (error = zap_cursor_retrieve(&zc, &zap)) { 2337 if ((*eofp = (error == ENOENT)) != 0) 2338 break; 2339 else 2340 goto update; 2341 } 2342 2343 if (zap.za_integer_length != 8 || 2344 zap.za_num_integers != 1) { 2345 cmn_err(CE_WARN, "zap_readdir: bad directory " 2346 "entry, obj = %lld, offset = %lld\n", 2347 (u_longlong_t)zp->z_id, 2348 (u_longlong_t)offset); 2349 error = SET_ERROR(ENXIO); 2350 goto update; 2351 } 2352 2353 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer); 2354 /* 2355 * MacOS X can extract the object type here such as: 2356 * uint8_t type = ZFS_DIRENT_TYPE(zap.za_first_integer); 2357 */ 2358 2359 if (check_sysattrs && !zap.za_normalization_conflict) { 2360 zap.za_normalization_conflict = 2361 xattr_sysattr_casechk(zap.za_name); 2362 } 2363 } 2364 2365 if (flags & V_RDDIR_ACCFILTER) { 2366 /* 2367 * If we have no access at all, don't include 2368 * this entry in the returned information 2369 */ 2370 znode_t *ezp; 2371 if (zfs_zget(zp->z_zfsvfs, objnum, &ezp) != 0) 2372 goto skip_entry; 2373 if (!zfs_has_access(ezp, cr)) { 2374 VN_RELE(ZTOV(ezp)); 2375 goto skip_entry; 2376 } 2377 VN_RELE(ZTOV(ezp)); 2378 } 2379 2380 if (flags & V_RDDIR_ENTFLAGS) 2381 reclen = EDIRENT_RECLEN(strlen(zap.za_name)); 2382 else 2383 reclen = DIRENT64_RECLEN(strlen(zap.za_name)); 2384 2385 /* 2386 * Will this entry fit in the buffer? 2387 */ 2388 if (outcount + reclen > bufsize) { 2389 /* 2390 * Did we manage to fit anything in the buffer? 2391 */ 2392 if (!outcount) { 2393 error = SET_ERROR(EINVAL); 2394 goto update; 2395 } 2396 break; 2397 } 2398 if (flags & V_RDDIR_ENTFLAGS) { 2399 /* 2400 * Add extended flag entry: 2401 */ 2402 eodp->ed_ino = objnum; 2403 eodp->ed_reclen = reclen; 2404 /* NOTE: ed_off is the offset for the *next* entry */ 2405 next = &(eodp->ed_off); 2406 eodp->ed_eflags = zap.za_normalization_conflict ? 2407 ED_CASE_CONFLICT : 0; 2408 (void) strncpy(eodp->ed_name, zap.za_name, 2409 EDIRENT_NAMELEN(reclen)); 2410 eodp = (edirent_t *)((intptr_t)eodp + reclen); 2411 } else { 2412 /* 2413 * Add normal entry: 2414 */ 2415 odp->d_ino = objnum; 2416 odp->d_reclen = reclen; 2417 /* NOTE: d_off is the offset for the *next* entry */ 2418 next = &(odp->d_off); 2419 (void) strncpy(odp->d_name, zap.za_name, 2420 DIRENT64_NAMELEN(reclen)); 2421 odp = (dirent64_t *)((intptr_t)odp + reclen); 2422 } 2423 outcount += reclen; 2424 2425 ASSERT(outcount <= bufsize); 2426 2427 /* Prefetch znode */ 2428 if (prefetch) 2429 dmu_prefetch(os, objnum, 0, 0, 0, 2430 ZIO_PRIORITY_SYNC_READ); 2431 2432 skip_entry: 2433 /* 2434 * Move to the next entry, fill in the previous offset. 2435 */ 2436 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) { 2437 zap_cursor_advance(&zc); 2438 offset = zap_cursor_serialize(&zc); 2439 } else { 2440 offset += 1; 2441 } 2442 if (next) 2443 *next = offset; 2444 } 2445 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */ 2446 2447 if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) { 2448 iovp->iov_base += outcount; 2449 iovp->iov_len -= outcount; 2450 uio->uio_resid -= outcount; 2451 } else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) { 2452 /* 2453 * Reset the pointer. 2454 */ 2455 offset = uio->uio_loffset; 2456 } 2457 2458 update: 2459 zap_cursor_fini(&zc); 2460 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) 2461 kmem_free(outbuf, bufsize); 2462 2463 if (error == ENOENT) 2464 error = 0; 2465 2466 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 2467 2468 uio->uio_loffset = offset; 2469 ZFS_EXIT(zfsvfs); 2470 return (error); 2471 } 2472 2473 ulong_t zfs_fsync_sync_cnt = 4; 2474 2475 static int 2476 zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct) 2477 { 2478 znode_t *zp = VTOZ(vp); 2479 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2480 2481 /* 2482 * Regardless of whether this is required for standards conformance, 2483 * this is the logical behavior when fsync() is called on a file with 2484 * dirty pages. We use B_ASYNC since the ZIL transactions are already 2485 * going to be pushed out as part of the zil_commit(). 2486 */ 2487 if (vn_has_cached_data(vp) && !(syncflag & FNODSYNC) && 2488 (vp->v_type == VREG) && !(IS_SWAPVP(vp))) 2489 (void) VOP_PUTPAGE(vp, (offset_t)0, (size_t)0, B_ASYNC, cr, ct); 2490 2491 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt); 2492 2493 if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) { 2494 ZFS_ENTER(zfsvfs); 2495 ZFS_VERIFY_ZP(zp); 2496 zil_commit(zfsvfs->z_log, zp->z_id); 2497 ZFS_EXIT(zfsvfs); 2498 } 2499 return (0); 2500 } 2501 2502 2503 /* 2504 * Get the requested file attributes and place them in the provided 2505 * vattr structure. 2506 * 2507 * IN: vp - vnode of file. 2508 * vap - va_mask identifies requested attributes. 2509 * If AT_XVATTR set, then optional attrs are requested 2510 * flags - ATTR_NOACLCHECK (CIFS server context) 2511 * cr - credentials of caller. 2512 * ct - caller context 2513 * 2514 * OUT: vap - attribute values. 2515 * 2516 * RETURN: 0 (always succeeds). 2517 */ 2518 /* ARGSUSED */ 2519 static int 2520 zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 2521 caller_context_t *ct) 2522 { 2523 znode_t *zp = VTOZ(vp); 2524 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2525 int error = 0; 2526 uint64_t links; 2527 uint64_t mtime[2], ctime[2]; 2528 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */ 2529 xoptattr_t *xoap = NULL; 2530 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 2531 sa_bulk_attr_t bulk[2]; 2532 int count = 0; 2533 2534 ZFS_ENTER(zfsvfs); 2535 ZFS_VERIFY_ZP(zp); 2536 2537 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid); 2538 2539 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16); 2540 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16); 2541 2542 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) { 2543 ZFS_EXIT(zfsvfs); 2544 return (error); 2545 } 2546 2547 /* 2548 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES. 2549 * Also, if we are the owner don't bother, since owner should 2550 * always be allowed to read basic attributes of file. 2551 */ 2552 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) && 2553 (vap->va_uid != crgetuid(cr))) { 2554 if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0, 2555 skipaclchk, cr)) { 2556 ZFS_EXIT(zfsvfs); 2557 return (error); 2558 } 2559 } 2560 2561 /* 2562 * Return all attributes. It's cheaper to provide the answer 2563 * than to determine whether we were asked the question. 2564 */ 2565 2566 mutex_enter(&zp->z_lock); 2567 vap->va_type = vp->v_type; 2568 vap->va_mode = zp->z_mode & MODEMASK; 2569 vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev; 2570 vap->va_nodeid = zp->z_id; 2571 if ((vp->v_flag & VROOT) && zfs_show_ctldir(zp)) 2572 links = zp->z_links + 1; 2573 else 2574 links = zp->z_links; 2575 vap->va_nlink = MIN(links, UINT32_MAX); /* nlink_t limit! */ 2576 vap->va_size = zp->z_size; 2577 vap->va_rdev = vp->v_rdev; 2578 vap->va_seq = zp->z_seq; 2579 2580 /* 2581 * Add in any requested optional attributes and the create time. 2582 * Also set the corresponding bits in the returned attribute bitmap. 2583 */ 2584 if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) { 2585 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 2586 xoap->xoa_archive = 2587 ((zp->z_pflags & ZFS_ARCHIVE) != 0); 2588 XVA_SET_RTN(xvap, XAT_ARCHIVE); 2589 } 2590 2591 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 2592 xoap->xoa_readonly = 2593 ((zp->z_pflags & ZFS_READONLY) != 0); 2594 XVA_SET_RTN(xvap, XAT_READONLY); 2595 } 2596 2597 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 2598 xoap->xoa_system = 2599 ((zp->z_pflags & ZFS_SYSTEM) != 0); 2600 XVA_SET_RTN(xvap, XAT_SYSTEM); 2601 } 2602 2603 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 2604 xoap->xoa_hidden = 2605 ((zp->z_pflags & ZFS_HIDDEN) != 0); 2606 XVA_SET_RTN(xvap, XAT_HIDDEN); 2607 } 2608 2609 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 2610 xoap->xoa_nounlink = 2611 ((zp->z_pflags & ZFS_NOUNLINK) != 0); 2612 XVA_SET_RTN(xvap, XAT_NOUNLINK); 2613 } 2614 2615 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 2616 xoap->xoa_immutable = 2617 ((zp->z_pflags & ZFS_IMMUTABLE) != 0); 2618 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 2619 } 2620 2621 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 2622 xoap->xoa_appendonly = 2623 ((zp->z_pflags & ZFS_APPENDONLY) != 0); 2624 XVA_SET_RTN(xvap, XAT_APPENDONLY); 2625 } 2626 2627 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 2628 xoap->xoa_nodump = 2629 ((zp->z_pflags & ZFS_NODUMP) != 0); 2630 XVA_SET_RTN(xvap, XAT_NODUMP); 2631 } 2632 2633 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 2634 xoap->xoa_opaque = 2635 ((zp->z_pflags & ZFS_OPAQUE) != 0); 2636 XVA_SET_RTN(xvap, XAT_OPAQUE); 2637 } 2638 2639 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 2640 xoap->xoa_av_quarantined = 2641 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0); 2642 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 2643 } 2644 2645 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 2646 xoap->xoa_av_modified = 2647 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0); 2648 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 2649 } 2650 2651 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) && 2652 vp->v_type == VREG) { 2653 zfs_sa_get_scanstamp(zp, xvap); 2654 } 2655 2656 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 2657 uint64_t times[2]; 2658 2659 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs), 2660 times, sizeof (times)); 2661 ZFS_TIME_DECODE(&xoap->xoa_createtime, times); 2662 XVA_SET_RTN(xvap, XAT_CREATETIME); 2663 } 2664 2665 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 2666 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0); 2667 XVA_SET_RTN(xvap, XAT_REPARSE); 2668 } 2669 if (XVA_ISSET_REQ(xvap, XAT_GEN)) { 2670 xoap->xoa_generation = zp->z_gen; 2671 XVA_SET_RTN(xvap, XAT_GEN); 2672 } 2673 2674 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 2675 xoap->xoa_offline = 2676 ((zp->z_pflags & ZFS_OFFLINE) != 0); 2677 XVA_SET_RTN(xvap, XAT_OFFLINE); 2678 } 2679 2680 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 2681 xoap->xoa_sparse = 2682 ((zp->z_pflags & ZFS_SPARSE) != 0); 2683 XVA_SET_RTN(xvap, XAT_SPARSE); 2684 } 2685 } 2686 2687 ZFS_TIME_DECODE(&vap->va_atime, zp->z_atime); 2688 ZFS_TIME_DECODE(&vap->va_mtime, mtime); 2689 ZFS_TIME_DECODE(&vap->va_ctime, ctime); 2690 2691 mutex_exit(&zp->z_lock); 2692 2693 sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks); 2694 2695 if (zp->z_blksz == 0) { 2696 /* 2697 * Block size hasn't been set; suggest maximal I/O transfers. 2698 */ 2699 vap->va_blksize = zfsvfs->z_max_blksz; 2700 } 2701 2702 ZFS_EXIT(zfsvfs); 2703 return (0); 2704 } 2705 2706 /* 2707 * Set the file attributes to the values contained in the 2708 * vattr structure. 2709 * 2710 * IN: vp - vnode of file to be modified. 2711 * vap - new attribute values. 2712 * If AT_XVATTR set, then optional attrs are being set 2713 * flags - ATTR_UTIME set if non-default time values provided. 2714 * - ATTR_NOACLCHECK (CIFS context only). 2715 * cr - credentials of caller. 2716 * ct - caller context 2717 * 2718 * RETURN: 0 on success, error code on failure. 2719 * 2720 * Timestamps: 2721 * vp - ctime updated, mtime updated if size changed. 2722 */ 2723 /* ARGSUSED */ 2724 static int 2725 zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr, 2726 caller_context_t *ct) 2727 { 2728 znode_t *zp = VTOZ(vp); 2729 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2730 zilog_t *zilog; 2731 dmu_tx_t *tx; 2732 vattr_t oldva; 2733 xvattr_t tmpxvattr; 2734 uint_t mask = vap->va_mask; 2735 uint_t saved_mask = 0; 2736 int trim_mask = 0; 2737 uint64_t new_mode; 2738 uint64_t new_uid, new_gid; 2739 uint64_t xattr_obj; 2740 uint64_t mtime[2], ctime[2]; 2741 znode_t *attrzp; 2742 int need_policy = FALSE; 2743 int err, err2; 2744 zfs_fuid_info_t *fuidp = NULL; 2745 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */ 2746 xoptattr_t *xoap; 2747 zfs_acl_t *aclp; 2748 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 2749 boolean_t fuid_dirtied = B_FALSE; 2750 sa_bulk_attr_t bulk[7], xattr_bulk[7]; 2751 int count = 0, xattr_count = 0; 2752 2753 if (mask == 0) 2754 return (0); 2755 2756 if (mask & AT_NOSET) 2757 return (SET_ERROR(EINVAL)); 2758 2759 ZFS_ENTER(zfsvfs); 2760 ZFS_VERIFY_ZP(zp); 2761 2762 zilog = zfsvfs->z_log; 2763 2764 /* 2765 * Make sure that if we have ephemeral uid/gid or xvattr specified 2766 * that file system is at proper version level 2767 */ 2768 2769 if (zfsvfs->z_use_fuids == B_FALSE && 2770 (((mask & AT_UID) && IS_EPHEMERAL(vap->va_uid)) || 2771 ((mask & AT_GID) && IS_EPHEMERAL(vap->va_gid)) || 2772 (mask & AT_XVATTR))) { 2773 ZFS_EXIT(zfsvfs); 2774 return (SET_ERROR(EINVAL)); 2775 } 2776 2777 if (mask & AT_SIZE && vp->v_type == VDIR) { 2778 ZFS_EXIT(zfsvfs); 2779 return (SET_ERROR(EISDIR)); 2780 } 2781 2782 if (mask & AT_SIZE && vp->v_type != VREG && vp->v_type != VFIFO) { 2783 ZFS_EXIT(zfsvfs); 2784 return (SET_ERROR(EINVAL)); 2785 } 2786 2787 /* 2788 * If this is an xvattr_t, then get a pointer to the structure of 2789 * optional attributes. If this is NULL, then we have a vattr_t. 2790 */ 2791 xoap = xva_getxoptattr(xvap); 2792 2793 xva_init(&tmpxvattr); 2794 2795 /* 2796 * Immutable files can only alter immutable bit and atime 2797 */ 2798 if ((zp->z_pflags & ZFS_IMMUTABLE) && 2799 ((mask & (AT_SIZE|AT_UID|AT_GID|AT_MTIME|AT_MODE)) || 2800 ((mask & AT_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) { 2801 ZFS_EXIT(zfsvfs); 2802 return (SET_ERROR(EPERM)); 2803 } 2804 2805 /* 2806 * Note: ZFS_READONLY is handled in zfs_zaccess_common. 2807 */ 2808 2809 /* 2810 * Verify timestamps doesn't overflow 32 bits. 2811 * ZFS can handle large timestamps, but 32bit syscalls can't 2812 * handle times greater than 2039. This check should be removed 2813 * once large timestamps are fully supported. 2814 */ 2815 if (mask & (AT_ATIME | AT_MTIME)) { 2816 if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) || 2817 ((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) { 2818 ZFS_EXIT(zfsvfs); 2819 return (SET_ERROR(EOVERFLOW)); 2820 } 2821 } 2822 2823 top: 2824 attrzp = NULL; 2825 aclp = NULL; 2826 2827 /* Can this be moved to before the top label? */ 2828 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { 2829 ZFS_EXIT(zfsvfs); 2830 return (SET_ERROR(EROFS)); 2831 } 2832 2833 /* 2834 * First validate permissions 2835 */ 2836 2837 if (mask & AT_SIZE) { 2838 err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr); 2839 if (err) { 2840 ZFS_EXIT(zfsvfs); 2841 return (err); 2842 } 2843 /* 2844 * XXX - Note, we are not providing any open 2845 * mode flags here (like FNDELAY), so we may 2846 * block if there are locks present... this 2847 * should be addressed in openat(). 2848 */ 2849 /* XXX - would it be OK to generate a log record here? */ 2850 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE); 2851 if (err) { 2852 ZFS_EXIT(zfsvfs); 2853 return (err); 2854 } 2855 2856 if (vap->va_size == 0) 2857 vnevent_truncate(ZTOV(zp), ct); 2858 } 2859 2860 if (mask & (AT_ATIME|AT_MTIME) || 2861 ((mask & AT_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) || 2862 XVA_ISSET_REQ(xvap, XAT_READONLY) || 2863 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) || 2864 XVA_ISSET_REQ(xvap, XAT_OFFLINE) || 2865 XVA_ISSET_REQ(xvap, XAT_SPARSE) || 2866 XVA_ISSET_REQ(xvap, XAT_CREATETIME) || 2867 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) { 2868 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0, 2869 skipaclchk, cr); 2870 } 2871 2872 if (mask & (AT_UID|AT_GID)) { 2873 int idmask = (mask & (AT_UID|AT_GID)); 2874 int take_owner; 2875 int take_group; 2876 2877 /* 2878 * NOTE: even if a new mode is being set, 2879 * we may clear S_ISUID/S_ISGID bits. 2880 */ 2881 2882 if (!(mask & AT_MODE)) 2883 vap->va_mode = zp->z_mode; 2884 2885 /* 2886 * Take ownership or chgrp to group we are a member of 2887 */ 2888 2889 take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr)); 2890 take_group = (mask & AT_GID) && 2891 zfs_groupmember(zfsvfs, vap->va_gid, cr); 2892 2893 /* 2894 * If both AT_UID and AT_GID are set then take_owner and 2895 * take_group must both be set in order to allow taking 2896 * ownership. 2897 * 2898 * Otherwise, send the check through secpolicy_vnode_setattr() 2899 * 2900 */ 2901 2902 if (((idmask == (AT_UID|AT_GID)) && take_owner && take_group) || 2903 ((idmask == AT_UID) && take_owner) || 2904 ((idmask == AT_GID) && take_group)) { 2905 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0, 2906 skipaclchk, cr) == 0) { 2907 /* 2908 * Remove setuid/setgid for non-privileged users 2909 */ 2910 secpolicy_setid_clear(vap, cr); 2911 trim_mask = (mask & (AT_UID|AT_GID)); 2912 } else { 2913 need_policy = TRUE; 2914 } 2915 } else { 2916 need_policy = TRUE; 2917 } 2918 } 2919 2920 mutex_enter(&zp->z_lock); 2921 oldva.va_mode = zp->z_mode; 2922 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid); 2923 if (mask & AT_XVATTR) { 2924 /* 2925 * Update xvattr mask to include only those attributes 2926 * that are actually changing. 2927 * 2928 * the bits will be restored prior to actually setting 2929 * the attributes so the caller thinks they were set. 2930 */ 2931 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 2932 if (xoap->xoa_appendonly != 2933 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) { 2934 need_policy = TRUE; 2935 } else { 2936 XVA_CLR_REQ(xvap, XAT_APPENDONLY); 2937 XVA_SET_REQ(&tmpxvattr, XAT_APPENDONLY); 2938 } 2939 } 2940 2941 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 2942 if (xoap->xoa_nounlink != 2943 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) { 2944 need_policy = TRUE; 2945 } else { 2946 XVA_CLR_REQ(xvap, XAT_NOUNLINK); 2947 XVA_SET_REQ(&tmpxvattr, XAT_NOUNLINK); 2948 } 2949 } 2950 2951 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 2952 if (xoap->xoa_immutable != 2953 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) { 2954 need_policy = TRUE; 2955 } else { 2956 XVA_CLR_REQ(xvap, XAT_IMMUTABLE); 2957 XVA_SET_REQ(&tmpxvattr, XAT_IMMUTABLE); 2958 } 2959 } 2960 2961 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 2962 if (xoap->xoa_nodump != 2963 ((zp->z_pflags & ZFS_NODUMP) != 0)) { 2964 need_policy = TRUE; 2965 } else { 2966 XVA_CLR_REQ(xvap, XAT_NODUMP); 2967 XVA_SET_REQ(&tmpxvattr, XAT_NODUMP); 2968 } 2969 } 2970 2971 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 2972 if (xoap->xoa_av_modified != 2973 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) { 2974 need_policy = TRUE; 2975 } else { 2976 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED); 2977 XVA_SET_REQ(&tmpxvattr, XAT_AV_MODIFIED); 2978 } 2979 } 2980 2981 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 2982 if ((vp->v_type != VREG && 2983 xoap->xoa_av_quarantined) || 2984 xoap->xoa_av_quarantined != 2985 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) { 2986 need_policy = TRUE; 2987 } else { 2988 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED); 2989 XVA_SET_REQ(&tmpxvattr, XAT_AV_QUARANTINED); 2990 } 2991 } 2992 2993 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 2994 mutex_exit(&zp->z_lock); 2995 ZFS_EXIT(zfsvfs); 2996 return (SET_ERROR(EPERM)); 2997 } 2998 2999 if (need_policy == FALSE && 3000 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) || 3001 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) { 3002 need_policy = TRUE; 3003 } 3004 } 3005 3006 mutex_exit(&zp->z_lock); 3007 3008 if (mask & AT_MODE) { 3009 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) { 3010 err = secpolicy_setid_setsticky_clear(vp, vap, 3011 &oldva, cr); 3012 if (err) { 3013 ZFS_EXIT(zfsvfs); 3014 return (err); 3015 } 3016 trim_mask |= AT_MODE; 3017 } else { 3018 need_policy = TRUE; 3019 } 3020 } 3021 3022 if (need_policy) { 3023 /* 3024 * If trim_mask is set then take ownership 3025 * has been granted or write_acl is present and user 3026 * has the ability to modify mode. In that case remove 3027 * UID|GID and or MODE from mask so that 3028 * secpolicy_vnode_setattr() doesn't revoke it. 3029 */ 3030 3031 if (trim_mask) { 3032 saved_mask = vap->va_mask; 3033 vap->va_mask &= ~trim_mask; 3034 } 3035 err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags, 3036 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp); 3037 if (err) { 3038 ZFS_EXIT(zfsvfs); 3039 return (err); 3040 } 3041 3042 if (trim_mask) 3043 vap->va_mask |= saved_mask; 3044 } 3045 3046 /* 3047 * secpolicy_vnode_setattr, or take ownership may have 3048 * changed va_mask 3049 */ 3050 mask = vap->va_mask; 3051 3052 if ((mask & (AT_UID | AT_GID))) { 3053 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 3054 &xattr_obj, sizeof (xattr_obj)); 3055 3056 if (err == 0 && xattr_obj) { 3057 err = zfs_zget(zp->z_zfsvfs, xattr_obj, &attrzp); 3058 if (err) 3059 goto out2; 3060 } 3061 if (mask & AT_UID) { 3062 new_uid = zfs_fuid_create(zfsvfs, 3063 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp); 3064 if (new_uid != zp->z_uid && 3065 zfs_fuid_overquota(zfsvfs, B_FALSE, new_uid)) { 3066 if (attrzp) 3067 VN_RELE(ZTOV(attrzp)); 3068 err = SET_ERROR(EDQUOT); 3069 goto out2; 3070 } 3071 } 3072 3073 if (mask & AT_GID) { 3074 new_gid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid, 3075 cr, ZFS_GROUP, &fuidp); 3076 if (new_gid != zp->z_gid && 3077 zfs_fuid_overquota(zfsvfs, B_TRUE, new_gid)) { 3078 if (attrzp) 3079 VN_RELE(ZTOV(attrzp)); 3080 err = SET_ERROR(EDQUOT); 3081 goto out2; 3082 } 3083 } 3084 } 3085 tx = dmu_tx_create(zfsvfs->z_os); 3086 3087 if (mask & AT_MODE) { 3088 uint64_t pmode = zp->z_mode; 3089 uint64_t acl_obj; 3090 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT); 3091 3092 if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED && 3093 !(zp->z_pflags & ZFS_ACL_TRIVIAL)) { 3094 err = SET_ERROR(EPERM); 3095 goto out; 3096 } 3097 3098 if (err = zfs_acl_chmod_setattr(zp, &aclp, new_mode)) 3099 goto out; 3100 3101 mutex_enter(&zp->z_lock); 3102 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) { 3103 /* 3104 * Are we upgrading ACL from old V0 format 3105 * to V1 format? 3106 */ 3107 if (zfsvfs->z_version >= ZPL_VERSION_FUID && 3108 zfs_znode_acl_version(zp) == 3109 ZFS_ACL_VERSION_INITIAL) { 3110 dmu_tx_hold_free(tx, acl_obj, 0, 3111 DMU_OBJECT_END); 3112 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 3113 0, aclp->z_acl_bytes); 3114 } else { 3115 dmu_tx_hold_write(tx, acl_obj, 0, 3116 aclp->z_acl_bytes); 3117 } 3118 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) { 3119 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 3120 0, aclp->z_acl_bytes); 3121 } 3122 mutex_exit(&zp->z_lock); 3123 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 3124 } else { 3125 if ((mask & AT_XVATTR) && 3126 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) 3127 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 3128 else 3129 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 3130 } 3131 3132 if (attrzp) { 3133 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE); 3134 } 3135 3136 fuid_dirtied = zfsvfs->z_fuid_dirty; 3137 if (fuid_dirtied) 3138 zfs_fuid_txhold(zfsvfs, tx); 3139 3140 zfs_sa_upgrade_txholds(tx, zp); 3141 3142 err = dmu_tx_assign(tx, TXG_WAIT); 3143 if (err) 3144 goto out; 3145 3146 count = 0; 3147 /* 3148 * Set each attribute requested. 3149 * We group settings according to the locks they need to acquire. 3150 * 3151 * Note: you cannot set ctime directly, although it will be 3152 * updated as a side-effect of calling this function. 3153 */ 3154 3155 3156 if (mask & (AT_UID|AT_GID|AT_MODE)) 3157 mutex_enter(&zp->z_acl_lock); 3158 mutex_enter(&zp->z_lock); 3159 3160 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 3161 &zp->z_pflags, sizeof (zp->z_pflags)); 3162 3163 if (attrzp) { 3164 if (mask & (AT_UID|AT_GID|AT_MODE)) 3165 mutex_enter(&attrzp->z_acl_lock); 3166 mutex_enter(&attrzp->z_lock); 3167 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3168 SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags, 3169 sizeof (attrzp->z_pflags)); 3170 } 3171 3172 if (mask & (AT_UID|AT_GID)) { 3173 3174 if (mask & AT_UID) { 3175 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 3176 &new_uid, sizeof (new_uid)); 3177 zp->z_uid = new_uid; 3178 if (attrzp) { 3179 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3180 SA_ZPL_UID(zfsvfs), NULL, &new_uid, 3181 sizeof (new_uid)); 3182 attrzp->z_uid = new_uid; 3183 } 3184 } 3185 3186 if (mask & AT_GID) { 3187 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), 3188 NULL, &new_gid, sizeof (new_gid)); 3189 zp->z_gid = new_gid; 3190 if (attrzp) { 3191 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3192 SA_ZPL_GID(zfsvfs), NULL, &new_gid, 3193 sizeof (new_gid)); 3194 attrzp->z_gid = new_gid; 3195 } 3196 } 3197 if (!(mask & AT_MODE)) { 3198 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), 3199 NULL, &new_mode, sizeof (new_mode)); 3200 new_mode = zp->z_mode; 3201 } 3202 err = zfs_acl_chown_setattr(zp); 3203 ASSERT(err == 0); 3204 if (attrzp) { 3205 err = zfs_acl_chown_setattr(attrzp); 3206 ASSERT(err == 0); 3207 } 3208 } 3209 3210 if (mask & AT_MODE) { 3211 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 3212 &new_mode, sizeof (new_mode)); 3213 zp->z_mode = new_mode; 3214 ASSERT3U((uintptr_t)aclp, !=, NULL); 3215 err = zfs_aclset_common(zp, aclp, cr, tx); 3216 ASSERT0(err); 3217 if (zp->z_acl_cached) 3218 zfs_acl_free(zp->z_acl_cached); 3219 zp->z_acl_cached = aclp; 3220 aclp = NULL; 3221 } 3222 3223 3224 if (mask & AT_ATIME) { 3225 ZFS_TIME_ENCODE(&vap->va_atime, zp->z_atime); 3226 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 3227 &zp->z_atime, sizeof (zp->z_atime)); 3228 } 3229 3230 if (mask & AT_MTIME) { 3231 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 3232 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 3233 mtime, sizeof (mtime)); 3234 } 3235 3236 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */ 3237 if (mask & AT_SIZE && !(mask & AT_MTIME)) { 3238 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), 3239 NULL, mtime, sizeof (mtime)); 3240 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 3241 &ctime, sizeof (ctime)); 3242 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 3243 B_TRUE); 3244 } else if (mask != 0) { 3245 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 3246 &ctime, sizeof (ctime)); 3247 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime, 3248 B_TRUE); 3249 if (attrzp) { 3250 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count, 3251 SA_ZPL_CTIME(zfsvfs), NULL, 3252 &ctime, sizeof (ctime)); 3253 zfs_tstamp_update_setup(attrzp, STATE_CHANGED, 3254 mtime, ctime, B_TRUE); 3255 } 3256 } 3257 /* 3258 * Do this after setting timestamps to prevent timestamp 3259 * update from toggling bit 3260 */ 3261 3262 if (xoap && (mask & AT_XVATTR)) { 3263 3264 /* 3265 * restore trimmed off masks 3266 * so that return masks can be set for caller. 3267 */ 3268 3269 if (XVA_ISSET_REQ(&tmpxvattr, XAT_APPENDONLY)) { 3270 XVA_SET_REQ(xvap, XAT_APPENDONLY); 3271 } 3272 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NOUNLINK)) { 3273 XVA_SET_REQ(xvap, XAT_NOUNLINK); 3274 } 3275 if (XVA_ISSET_REQ(&tmpxvattr, XAT_IMMUTABLE)) { 3276 XVA_SET_REQ(xvap, XAT_IMMUTABLE); 3277 } 3278 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NODUMP)) { 3279 XVA_SET_REQ(xvap, XAT_NODUMP); 3280 } 3281 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_MODIFIED)) { 3282 XVA_SET_REQ(xvap, XAT_AV_MODIFIED); 3283 } 3284 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_QUARANTINED)) { 3285 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED); 3286 } 3287 3288 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) 3289 ASSERT(vp->v_type == VREG); 3290 3291 zfs_xvattr_set(zp, xvap, tx); 3292 } 3293 3294 if (fuid_dirtied) 3295 zfs_fuid_sync(zfsvfs, tx); 3296 3297 if (mask != 0) 3298 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp); 3299 3300 mutex_exit(&zp->z_lock); 3301 if (mask & (AT_UID|AT_GID|AT_MODE)) 3302 mutex_exit(&zp->z_acl_lock); 3303 3304 if (attrzp) { 3305 if (mask & (AT_UID|AT_GID|AT_MODE)) 3306 mutex_exit(&attrzp->z_acl_lock); 3307 mutex_exit(&attrzp->z_lock); 3308 } 3309 out: 3310 if (err == 0 && attrzp) { 3311 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk, 3312 xattr_count, tx); 3313 ASSERT(err2 == 0); 3314 } 3315 3316 if (attrzp) 3317 VN_RELE(ZTOV(attrzp)); 3318 3319 if (aclp) 3320 zfs_acl_free(aclp); 3321 3322 if (fuidp) { 3323 zfs_fuid_info_free(fuidp); 3324 fuidp = NULL; 3325 } 3326 3327 if (err) { 3328 dmu_tx_abort(tx); 3329 if (err == ERESTART) 3330 goto top; 3331 } else { 3332 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 3333 dmu_tx_commit(tx); 3334 } 3335 3336 out2: 3337 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 3338 zil_commit(zilog, 0); 3339 3340 ZFS_EXIT(zfsvfs); 3341 return (err); 3342 } 3343 3344 typedef struct zfs_zlock { 3345 krwlock_t *zl_rwlock; /* lock we acquired */ 3346 znode_t *zl_znode; /* znode we held */ 3347 struct zfs_zlock *zl_next; /* next in list */ 3348 } zfs_zlock_t; 3349 3350 /* 3351 * Drop locks and release vnodes that were held by zfs_rename_lock(). 3352 */ 3353 static void 3354 zfs_rename_unlock(zfs_zlock_t **zlpp) 3355 { 3356 zfs_zlock_t *zl; 3357 3358 while ((zl = *zlpp) != NULL) { 3359 if (zl->zl_znode != NULL) 3360 VN_RELE(ZTOV(zl->zl_znode)); 3361 rw_exit(zl->zl_rwlock); 3362 *zlpp = zl->zl_next; 3363 kmem_free(zl, sizeof (*zl)); 3364 } 3365 } 3366 3367 /* 3368 * Search back through the directory tree, using the ".." entries. 3369 * Lock each directory in the chain to prevent concurrent renames. 3370 * Fail any attempt to move a directory into one of its own descendants. 3371 * XXX - z_parent_lock can overlap with map or grow locks 3372 */ 3373 static int 3374 zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp) 3375 { 3376 zfs_zlock_t *zl; 3377 znode_t *zp = tdzp; 3378 uint64_t rootid = zp->z_zfsvfs->z_root; 3379 uint64_t oidp = zp->z_id; 3380 krwlock_t *rwlp = &szp->z_parent_lock; 3381 krw_t rw = RW_WRITER; 3382 3383 /* 3384 * First pass write-locks szp and compares to zp->z_id. 3385 * Later passes read-lock zp and compare to zp->z_parent. 3386 */ 3387 do { 3388 if (!rw_tryenter(rwlp, rw)) { 3389 /* 3390 * Another thread is renaming in this path. 3391 * Note that if we are a WRITER, we don't have any 3392 * parent_locks held yet. 3393 */ 3394 if (rw == RW_READER && zp->z_id > szp->z_id) { 3395 /* 3396 * Drop our locks and restart 3397 */ 3398 zfs_rename_unlock(&zl); 3399 *zlpp = NULL; 3400 zp = tdzp; 3401 oidp = zp->z_id; 3402 rwlp = &szp->z_parent_lock; 3403 rw = RW_WRITER; 3404 continue; 3405 } else { 3406 /* 3407 * Wait for other thread to drop its locks 3408 */ 3409 rw_enter(rwlp, rw); 3410 } 3411 } 3412 3413 zl = kmem_alloc(sizeof (*zl), KM_SLEEP); 3414 zl->zl_rwlock = rwlp; 3415 zl->zl_znode = NULL; 3416 zl->zl_next = *zlpp; 3417 *zlpp = zl; 3418 3419 if (oidp == szp->z_id) /* We're a descendant of szp */ 3420 return (SET_ERROR(EINVAL)); 3421 3422 if (oidp == rootid) /* We've hit the top */ 3423 return (0); 3424 3425 if (rw == RW_READER) { /* i.e. not the first pass */ 3426 int error = zfs_zget(zp->z_zfsvfs, oidp, &zp); 3427 if (error) 3428 return (error); 3429 zl->zl_znode = zp; 3430 } 3431 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zp->z_zfsvfs), 3432 &oidp, sizeof (oidp)); 3433 rwlp = &zp->z_parent_lock; 3434 rw = RW_READER; 3435 3436 } while (zp->z_id != sdzp->z_id); 3437 3438 return (0); 3439 } 3440 3441 /* 3442 * Move an entry from the provided source directory to the target 3443 * directory. Change the entry name as indicated. 3444 * 3445 * IN: sdvp - Source directory containing the "old entry". 3446 * snm - Old entry name. 3447 * tdvp - Target directory to contain the "new entry". 3448 * tnm - New entry name. 3449 * cr - credentials of caller. 3450 * ct - caller context 3451 * flags - case flags 3452 * 3453 * RETURN: 0 on success, error code on failure. 3454 * 3455 * Timestamps: 3456 * sdvp,tdvp - ctime|mtime updated 3457 */ 3458 /*ARGSUSED*/ 3459 static int 3460 zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr, 3461 caller_context_t *ct, int flags) 3462 { 3463 znode_t *tdzp, *szp, *tzp; 3464 znode_t *sdzp = VTOZ(sdvp); 3465 zfsvfs_t *zfsvfs = sdzp->z_zfsvfs; 3466 zilog_t *zilog; 3467 vnode_t *realvp; 3468 zfs_dirlock_t *sdl, *tdl; 3469 dmu_tx_t *tx; 3470 zfs_zlock_t *zl; 3471 int cmp, serr, terr; 3472 int error = 0, rm_err = 0; 3473 int zflg = 0; 3474 boolean_t waited = B_FALSE; 3475 3476 ZFS_ENTER(zfsvfs); 3477 ZFS_VERIFY_ZP(sdzp); 3478 zilog = zfsvfs->z_log; 3479 3480 /* 3481 * Make sure we have the real vp for the target directory. 3482 */ 3483 if (VOP_REALVP(tdvp, &realvp, ct) == 0) 3484 tdvp = realvp; 3485 3486 tdzp = VTOZ(tdvp); 3487 ZFS_VERIFY_ZP(tdzp); 3488 3489 /* 3490 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the 3491 * ctldir appear to have the same v_vfsp. 3492 */ 3493 if (tdzp->z_zfsvfs != zfsvfs || zfsctl_is_node(tdvp)) { 3494 ZFS_EXIT(zfsvfs); 3495 return (SET_ERROR(EXDEV)); 3496 } 3497 3498 if (zfsvfs->z_utf8 && u8_validate(tnm, 3499 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 3500 ZFS_EXIT(zfsvfs); 3501 return (SET_ERROR(EILSEQ)); 3502 } 3503 3504 if (flags & FIGNORECASE) 3505 zflg |= ZCILOOK; 3506 3507 top: 3508 szp = NULL; 3509 tzp = NULL; 3510 zl = NULL; 3511 3512 /* 3513 * This is to prevent the creation of links into attribute space 3514 * by renaming a linked file into/outof an attribute directory. 3515 * See the comment in zfs_link() for why this is considered bad. 3516 */ 3517 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) { 3518 ZFS_EXIT(zfsvfs); 3519 return (SET_ERROR(EINVAL)); 3520 } 3521 3522 /* 3523 * Lock source and target directory entries. To prevent deadlock, 3524 * a lock ordering must be defined. We lock the directory with 3525 * the smallest object id first, or if it's a tie, the one with 3526 * the lexically first name. 3527 */ 3528 if (sdzp->z_id < tdzp->z_id) { 3529 cmp = -1; 3530 } else if (sdzp->z_id > tdzp->z_id) { 3531 cmp = 1; 3532 } else { 3533 /* 3534 * First compare the two name arguments without 3535 * considering any case folding. 3536 */ 3537 int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER); 3538 3539 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error); 3540 ASSERT(error == 0 || !zfsvfs->z_utf8); 3541 if (cmp == 0) { 3542 /* 3543 * POSIX: "If the old argument and the new argument 3544 * both refer to links to the same existing file, 3545 * the rename() function shall return successfully 3546 * and perform no other action." 3547 */ 3548 ZFS_EXIT(zfsvfs); 3549 return (0); 3550 } 3551 /* 3552 * If the file system is case-folding, then we may 3553 * have some more checking to do. A case-folding file 3554 * system is either supporting mixed case sensitivity 3555 * access or is completely case-insensitive. Note 3556 * that the file system is always case preserving. 3557 * 3558 * In mixed sensitivity mode case sensitive behavior 3559 * is the default. FIGNORECASE must be used to 3560 * explicitly request case insensitive behavior. 3561 * 3562 * If the source and target names provided differ only 3563 * by case (e.g., a request to rename 'tim' to 'Tim'), 3564 * we will treat this as a special case in the 3565 * case-insensitive mode: as long as the source name 3566 * is an exact match, we will allow this to proceed as 3567 * a name-change request. 3568 */ 3569 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 3570 (zfsvfs->z_case == ZFS_CASE_MIXED && 3571 flags & FIGNORECASE)) && 3572 u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST, 3573 &error) == 0) { 3574 /* 3575 * case preserving rename request, require exact 3576 * name matches 3577 */ 3578 zflg |= ZCIEXACT; 3579 zflg &= ~ZCILOOK; 3580 } 3581 } 3582 3583 /* 3584 * If the source and destination directories are the same, we should 3585 * grab the z_name_lock of that directory only once. 3586 */ 3587 if (sdzp == tdzp) { 3588 zflg |= ZHAVELOCK; 3589 rw_enter(&sdzp->z_name_lock, RW_READER); 3590 } 3591 3592 if (cmp < 0) { 3593 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp, 3594 ZEXISTS | zflg, NULL, NULL); 3595 terr = zfs_dirent_lock(&tdl, 3596 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL); 3597 } else { 3598 terr = zfs_dirent_lock(&tdl, 3599 tdzp, tnm, &tzp, zflg, NULL, NULL); 3600 serr = zfs_dirent_lock(&sdl, 3601 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg, 3602 NULL, NULL); 3603 } 3604 3605 if (serr) { 3606 /* 3607 * Source entry invalid or not there. 3608 */ 3609 if (!terr) { 3610 zfs_dirent_unlock(tdl); 3611 if (tzp) 3612 VN_RELE(ZTOV(tzp)); 3613 } 3614 3615 if (sdzp == tdzp) 3616 rw_exit(&sdzp->z_name_lock); 3617 3618 if (strcmp(snm, "..") == 0) 3619 serr = SET_ERROR(EINVAL); 3620 ZFS_EXIT(zfsvfs); 3621 return (serr); 3622 } 3623 if (terr) { 3624 zfs_dirent_unlock(sdl); 3625 VN_RELE(ZTOV(szp)); 3626 3627 if (sdzp == tdzp) 3628 rw_exit(&sdzp->z_name_lock); 3629 3630 if (strcmp(tnm, "..") == 0) 3631 terr = SET_ERROR(EINVAL); 3632 ZFS_EXIT(zfsvfs); 3633 return (terr); 3634 } 3635 3636 /* 3637 * Must have write access at the source to remove the old entry 3638 * and write access at the target to create the new entry. 3639 * Note that if target and source are the same, this can be 3640 * done in a single check. 3641 */ 3642 3643 if (error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr)) 3644 goto out; 3645 3646 if (ZTOV(szp)->v_type == VDIR) { 3647 /* 3648 * Check to make sure rename is valid. 3649 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d 3650 */ 3651 if (error = zfs_rename_lock(szp, tdzp, sdzp, &zl)) 3652 goto out; 3653 } 3654 3655 /* 3656 * Does target exist? 3657 */ 3658 if (tzp) { 3659 /* 3660 * Source and target must be the same type. 3661 */ 3662 if (ZTOV(szp)->v_type == VDIR) { 3663 if (ZTOV(tzp)->v_type != VDIR) { 3664 error = SET_ERROR(ENOTDIR); 3665 goto out; 3666 } 3667 } else { 3668 if (ZTOV(tzp)->v_type == VDIR) { 3669 error = SET_ERROR(EISDIR); 3670 goto out; 3671 } 3672 } 3673 /* 3674 * POSIX dictates that when the source and target 3675 * entries refer to the same file object, rename 3676 * must do nothing and exit without error. 3677 */ 3678 if (szp->z_id == tzp->z_id) { 3679 error = 0; 3680 goto out; 3681 } 3682 } 3683 3684 vnevent_pre_rename_src(ZTOV(szp), sdvp, snm, ct); 3685 if (tzp) 3686 vnevent_pre_rename_dest(ZTOV(tzp), tdvp, tnm, ct); 3687 3688 /* 3689 * notify the target directory if it is not the same 3690 * as source directory. 3691 */ 3692 if (tdvp != sdvp) { 3693 vnevent_pre_rename_dest_dir(tdvp, ZTOV(szp), tnm, ct); 3694 } 3695 3696 tx = dmu_tx_create(zfsvfs->z_os); 3697 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE); 3698 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE); 3699 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm); 3700 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm); 3701 if (sdzp != tdzp) { 3702 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE); 3703 zfs_sa_upgrade_txholds(tx, tdzp); 3704 } 3705 if (tzp) { 3706 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE); 3707 zfs_sa_upgrade_txholds(tx, tzp); 3708 } 3709 3710 zfs_sa_upgrade_txholds(tx, szp); 3711 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 3712 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 3713 if (error) { 3714 if (zl != NULL) 3715 zfs_rename_unlock(&zl); 3716 zfs_dirent_unlock(sdl); 3717 zfs_dirent_unlock(tdl); 3718 3719 if (sdzp == tdzp) 3720 rw_exit(&sdzp->z_name_lock); 3721 3722 VN_RELE(ZTOV(szp)); 3723 if (tzp) 3724 VN_RELE(ZTOV(tzp)); 3725 if (error == ERESTART) { 3726 waited = B_TRUE; 3727 dmu_tx_wait(tx); 3728 dmu_tx_abort(tx); 3729 goto top; 3730 } 3731 dmu_tx_abort(tx); 3732 ZFS_EXIT(zfsvfs); 3733 return (error); 3734 } 3735 3736 if (tzp) /* Attempt to remove the existing target */ 3737 error = rm_err = zfs_link_destroy(tdl, tzp, tx, zflg, NULL); 3738 3739 if (error == 0) { 3740 error = zfs_link_create(tdl, szp, tx, ZRENAMING); 3741 if (error == 0) { 3742 szp->z_pflags |= ZFS_AV_MODIFIED; 3743 3744 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs), 3745 (void *)&szp->z_pflags, sizeof (uint64_t), tx); 3746 ASSERT0(error); 3747 3748 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL); 3749 if (error == 0) { 3750 zfs_log_rename(zilog, tx, TX_RENAME | 3751 (flags & FIGNORECASE ? TX_CI : 0), sdzp, 3752 sdl->dl_name, tdzp, tdl->dl_name, szp); 3753 3754 /* 3755 * Update path information for the target vnode 3756 */ 3757 vn_renamepath(tdvp, ZTOV(szp), tnm, 3758 strlen(tnm)); 3759 } else { 3760 /* 3761 * At this point, we have successfully created 3762 * the target name, but have failed to remove 3763 * the source name. Since the create was done 3764 * with the ZRENAMING flag, there are 3765 * complications; for one, the link count is 3766 * wrong. The easiest way to deal with this 3767 * is to remove the newly created target, and 3768 * return the original error. This must 3769 * succeed; fortunately, it is very unlikely to 3770 * fail, since we just created it. 3771 */ 3772 VERIFY3U(zfs_link_destroy(tdl, szp, tx, 3773 ZRENAMING, NULL), ==, 0); 3774 } 3775 } 3776 } 3777 3778 dmu_tx_commit(tx); 3779 3780 if (tzp && rm_err == 0) 3781 vnevent_rename_dest(ZTOV(tzp), tdvp, tnm, ct); 3782 3783 if (error == 0) { 3784 vnevent_rename_src(ZTOV(szp), sdvp, snm, ct); 3785 /* notify the target dir if it is not the same as source dir */ 3786 if (tdvp != sdvp) 3787 vnevent_rename_dest_dir(tdvp, ct); 3788 } 3789 out: 3790 if (zl != NULL) 3791 zfs_rename_unlock(&zl); 3792 3793 zfs_dirent_unlock(sdl); 3794 zfs_dirent_unlock(tdl); 3795 3796 if (sdzp == tdzp) 3797 rw_exit(&sdzp->z_name_lock); 3798 3799 3800 VN_RELE(ZTOV(szp)); 3801 if (tzp) 3802 VN_RELE(ZTOV(tzp)); 3803 3804 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 3805 zil_commit(zilog, 0); 3806 3807 ZFS_EXIT(zfsvfs); 3808 return (error); 3809 } 3810 3811 /* 3812 * Insert the indicated symbolic reference entry into the directory. 3813 * 3814 * IN: dvp - Directory to contain new symbolic link. 3815 * link - Name for new symlink entry. 3816 * vap - Attributes of new entry. 3817 * cr - credentials of caller. 3818 * ct - caller context 3819 * flags - case flags 3820 * 3821 * RETURN: 0 on success, error code on failure. 3822 * 3823 * Timestamps: 3824 * dvp - ctime|mtime updated 3825 */ 3826 /*ARGSUSED*/ 3827 static int 3828 zfs_symlink(vnode_t *dvp, char *name, vattr_t *vap, char *link, cred_t *cr, 3829 caller_context_t *ct, int flags) 3830 { 3831 znode_t *zp, *dzp = VTOZ(dvp); 3832 zfs_dirlock_t *dl; 3833 dmu_tx_t *tx; 3834 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 3835 zilog_t *zilog; 3836 uint64_t len = strlen(link); 3837 int error; 3838 int zflg = ZNEW; 3839 zfs_acl_ids_t acl_ids; 3840 boolean_t fuid_dirtied; 3841 uint64_t txtype = TX_SYMLINK; 3842 boolean_t waited = B_FALSE; 3843 3844 ASSERT(vap->va_type == VLNK); 3845 3846 ZFS_ENTER(zfsvfs); 3847 ZFS_VERIFY_ZP(dzp); 3848 zilog = zfsvfs->z_log; 3849 3850 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name), 3851 NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 3852 ZFS_EXIT(zfsvfs); 3853 return (SET_ERROR(EILSEQ)); 3854 } 3855 if (flags & FIGNORECASE) 3856 zflg |= ZCILOOK; 3857 3858 if (len > MAXPATHLEN) { 3859 ZFS_EXIT(zfsvfs); 3860 return (SET_ERROR(ENAMETOOLONG)); 3861 } 3862 3863 if ((error = zfs_acl_ids_create(dzp, 0, 3864 vap, cr, NULL, &acl_ids)) != 0) { 3865 ZFS_EXIT(zfsvfs); 3866 return (error); 3867 } 3868 top: 3869 /* 3870 * Attempt to lock directory; fail if entry already exists. 3871 */ 3872 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL); 3873 if (error) { 3874 zfs_acl_ids_free(&acl_ids); 3875 ZFS_EXIT(zfsvfs); 3876 return (error); 3877 } 3878 3879 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 3880 zfs_acl_ids_free(&acl_ids); 3881 zfs_dirent_unlock(dl); 3882 ZFS_EXIT(zfsvfs); 3883 return (error); 3884 } 3885 3886 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 3887 zfs_acl_ids_free(&acl_ids); 3888 zfs_dirent_unlock(dl); 3889 ZFS_EXIT(zfsvfs); 3890 return (SET_ERROR(EDQUOT)); 3891 } 3892 tx = dmu_tx_create(zfsvfs->z_os); 3893 fuid_dirtied = zfsvfs->z_fuid_dirty; 3894 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len)); 3895 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 3896 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 3897 ZFS_SA_BASE_ATTR_SIZE + len); 3898 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); 3899 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) { 3900 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 3901 acl_ids.z_aclp->z_acl_bytes); 3902 } 3903 if (fuid_dirtied) 3904 zfs_fuid_txhold(zfsvfs, tx); 3905 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 3906 if (error) { 3907 zfs_dirent_unlock(dl); 3908 if (error == ERESTART) { 3909 waited = B_TRUE; 3910 dmu_tx_wait(tx); 3911 dmu_tx_abort(tx); 3912 goto top; 3913 } 3914 zfs_acl_ids_free(&acl_ids); 3915 dmu_tx_abort(tx); 3916 ZFS_EXIT(zfsvfs); 3917 return (error); 3918 } 3919 3920 /* 3921 * Create a new object for the symlink. 3922 * for version 4 ZPL datsets the symlink will be an SA attribute 3923 */ 3924 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids); 3925 3926 if (fuid_dirtied) 3927 zfs_fuid_sync(zfsvfs, tx); 3928 3929 mutex_enter(&zp->z_lock); 3930 if (zp->z_is_sa) 3931 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs), 3932 link, len, tx); 3933 else 3934 zfs_sa_symlink(zp, link, len, tx); 3935 mutex_exit(&zp->z_lock); 3936 3937 zp->z_size = len; 3938 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs), 3939 &zp->z_size, sizeof (zp->z_size), tx); 3940 /* 3941 * Insert the new object into the directory. 3942 */ 3943 (void) zfs_link_create(dl, zp, tx, ZNEW); 3944 3945 if (flags & FIGNORECASE) 3946 txtype |= TX_CI; 3947 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link); 3948 3949 zfs_acl_ids_free(&acl_ids); 3950 3951 dmu_tx_commit(tx); 3952 3953 zfs_dirent_unlock(dl); 3954 3955 VN_RELE(ZTOV(zp)); 3956 3957 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 3958 zil_commit(zilog, 0); 3959 3960 ZFS_EXIT(zfsvfs); 3961 return (error); 3962 } 3963 3964 /* 3965 * Return, in the buffer contained in the provided uio structure, 3966 * the symbolic path referred to by vp. 3967 * 3968 * IN: vp - vnode of symbolic link. 3969 * uio - structure to contain the link path. 3970 * cr - credentials of caller. 3971 * ct - caller context 3972 * 3973 * OUT: uio - structure containing the link path. 3974 * 3975 * RETURN: 0 on success, error code on failure. 3976 * 3977 * Timestamps: 3978 * vp - atime updated 3979 */ 3980 /* ARGSUSED */ 3981 static int 3982 zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr, caller_context_t *ct) 3983 { 3984 znode_t *zp = VTOZ(vp); 3985 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 3986 int error; 3987 3988 ZFS_ENTER(zfsvfs); 3989 ZFS_VERIFY_ZP(zp); 3990 3991 mutex_enter(&zp->z_lock); 3992 if (zp->z_is_sa) 3993 error = sa_lookup_uio(zp->z_sa_hdl, 3994 SA_ZPL_SYMLINK(zfsvfs), uio); 3995 else 3996 error = zfs_sa_readlink(zp, uio); 3997 mutex_exit(&zp->z_lock); 3998 3999 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 4000 4001 ZFS_EXIT(zfsvfs); 4002 return (error); 4003 } 4004 4005 /* 4006 * Insert a new entry into directory tdvp referencing svp. 4007 * 4008 * IN: tdvp - Directory to contain new entry. 4009 * svp - vnode of new entry. 4010 * name - name of new entry. 4011 * cr - credentials of caller. 4012 * ct - caller context 4013 * 4014 * RETURN: 0 on success, error code on failure. 4015 * 4016 * Timestamps: 4017 * tdvp - ctime|mtime updated 4018 * svp - ctime updated 4019 */ 4020 /* ARGSUSED */ 4021 static int 4022 zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr, 4023 caller_context_t *ct, int flags) 4024 { 4025 znode_t *dzp = VTOZ(tdvp); 4026 znode_t *tzp, *szp; 4027 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 4028 zilog_t *zilog; 4029 zfs_dirlock_t *dl; 4030 dmu_tx_t *tx; 4031 vnode_t *realvp; 4032 int error; 4033 int zf = ZNEW; 4034 uint64_t parent; 4035 uid_t owner; 4036 boolean_t waited = B_FALSE; 4037 4038 ASSERT(tdvp->v_type == VDIR); 4039 4040 ZFS_ENTER(zfsvfs); 4041 ZFS_VERIFY_ZP(dzp); 4042 zilog = zfsvfs->z_log; 4043 4044 if (VOP_REALVP(svp, &realvp, ct) == 0) 4045 svp = realvp; 4046 4047 /* 4048 * POSIX dictates that we return EPERM here. 4049 * Better choices include ENOTSUP or EISDIR. 4050 */ 4051 if (svp->v_type == VDIR) { 4052 ZFS_EXIT(zfsvfs); 4053 return (SET_ERROR(EPERM)); 4054 } 4055 4056 szp = VTOZ(svp); 4057 ZFS_VERIFY_ZP(szp); 4058 4059 /* 4060 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the 4061 * ctldir appear to have the same v_vfsp. 4062 */ 4063 if (szp->z_zfsvfs != zfsvfs || zfsctl_is_node(svp)) { 4064 ZFS_EXIT(zfsvfs); 4065 return (SET_ERROR(EXDEV)); 4066 } 4067 4068 /* Prevent links to .zfs/shares files */ 4069 4070 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), 4071 &parent, sizeof (uint64_t))) != 0) { 4072 ZFS_EXIT(zfsvfs); 4073 return (error); 4074 } 4075 if (parent == zfsvfs->z_shares_dir) { 4076 ZFS_EXIT(zfsvfs); 4077 return (SET_ERROR(EPERM)); 4078 } 4079 4080 if (zfsvfs->z_utf8 && u8_validate(name, 4081 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) { 4082 ZFS_EXIT(zfsvfs); 4083 return (SET_ERROR(EILSEQ)); 4084 } 4085 if (flags & FIGNORECASE) 4086 zf |= ZCILOOK; 4087 4088 /* 4089 * We do not support links between attributes and non-attributes 4090 * because of the potential security risk of creating links 4091 * into "normal" file space in order to circumvent restrictions 4092 * imposed in attribute space. 4093 */ 4094 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) { 4095 ZFS_EXIT(zfsvfs); 4096 return (SET_ERROR(EINVAL)); 4097 } 4098 4099 4100 owner = zfs_fuid_map_id(zfsvfs, szp->z_uid, cr, ZFS_OWNER); 4101 if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) { 4102 ZFS_EXIT(zfsvfs); 4103 return (SET_ERROR(EPERM)); 4104 } 4105 4106 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) { 4107 ZFS_EXIT(zfsvfs); 4108 return (error); 4109 } 4110 4111 top: 4112 /* 4113 * Attempt to lock directory; fail if entry already exists. 4114 */ 4115 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL); 4116 if (error) { 4117 ZFS_EXIT(zfsvfs); 4118 return (error); 4119 } 4120 4121 tx = dmu_tx_create(zfsvfs->z_os); 4122 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE); 4123 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name); 4124 zfs_sa_upgrade_txholds(tx, szp); 4125 zfs_sa_upgrade_txholds(tx, dzp); 4126 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT); 4127 if (error) { 4128 zfs_dirent_unlock(dl); 4129 if (error == ERESTART) { 4130 waited = B_TRUE; 4131 dmu_tx_wait(tx); 4132 dmu_tx_abort(tx); 4133 goto top; 4134 } 4135 dmu_tx_abort(tx); 4136 ZFS_EXIT(zfsvfs); 4137 return (error); 4138 } 4139 4140 error = zfs_link_create(dl, szp, tx, 0); 4141 4142 if (error == 0) { 4143 uint64_t txtype = TX_LINK; 4144 if (flags & FIGNORECASE) 4145 txtype |= TX_CI; 4146 zfs_log_link(zilog, tx, txtype, dzp, szp, name); 4147 } 4148 4149 dmu_tx_commit(tx); 4150 4151 zfs_dirent_unlock(dl); 4152 4153 if (error == 0) { 4154 vnevent_link(svp, ct); 4155 } 4156 4157 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4158 zil_commit(zilog, 0); 4159 4160 ZFS_EXIT(zfsvfs); 4161 return (error); 4162 } 4163 4164 /* 4165 * zfs_null_putapage() is used when the file system has been force 4166 * unmounted. It just drops the pages. 4167 */ 4168 /* ARGSUSED */ 4169 static int 4170 zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 4171 size_t *lenp, int flags, cred_t *cr) 4172 { 4173 pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR); 4174 return (0); 4175 } 4176 4177 /* 4178 * Push a page out to disk, klustering if possible. 4179 * 4180 * IN: vp - file to push page to. 4181 * pp - page to push. 4182 * flags - additional flags. 4183 * cr - credentials of caller. 4184 * 4185 * OUT: offp - start of range pushed. 4186 * lenp - len of range pushed. 4187 * 4188 * RETURN: 0 on success, error code on failure. 4189 * 4190 * NOTE: callers must have locked the page to be pushed. On 4191 * exit, the page (and all other pages in the kluster) must be 4192 * unlocked. 4193 */ 4194 /* ARGSUSED */ 4195 static int 4196 zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp, 4197 size_t *lenp, int flags, cred_t *cr) 4198 { 4199 znode_t *zp = VTOZ(vp); 4200 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4201 dmu_tx_t *tx; 4202 u_offset_t off, koff; 4203 size_t len, klen; 4204 int err; 4205 4206 off = pp->p_offset; 4207 len = PAGESIZE; 4208 /* 4209 * If our blocksize is bigger than the page size, try to kluster 4210 * multiple pages so that we write a full block (thus avoiding 4211 * a read-modify-write). 4212 */ 4213 if (off < zp->z_size && zp->z_blksz > PAGESIZE) { 4214 klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE); 4215 koff = ISP2(klen) ? P2ALIGN(off, (u_offset_t)klen) : 0; 4216 ASSERT(koff <= zp->z_size); 4217 if (koff + klen > zp->z_size) 4218 klen = P2ROUNDUP(zp->z_size - koff, (uint64_t)PAGESIZE); 4219 pp = pvn_write_kluster(vp, pp, &off, &len, koff, klen, flags); 4220 } 4221 ASSERT3U(btop(len), ==, btopr(len)); 4222 4223 /* 4224 * Can't push pages past end-of-file. 4225 */ 4226 if (off >= zp->z_size) { 4227 /* ignore all pages */ 4228 err = 0; 4229 goto out; 4230 } else if (off + len > zp->z_size) { 4231 int npages = btopr(zp->z_size - off); 4232 page_t *trunc; 4233 4234 page_list_break(&pp, &trunc, npages); 4235 /* ignore pages past end of file */ 4236 if (trunc) 4237 pvn_write_done(trunc, flags); 4238 len = zp->z_size - off; 4239 } 4240 4241 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) || 4242 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) { 4243 err = SET_ERROR(EDQUOT); 4244 goto out; 4245 } 4246 tx = dmu_tx_create(zfsvfs->z_os); 4247 dmu_tx_hold_write(tx, zp->z_id, off, len); 4248 4249 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 4250 zfs_sa_upgrade_txholds(tx, zp); 4251 err = dmu_tx_assign(tx, TXG_WAIT); 4252 if (err != 0) { 4253 dmu_tx_abort(tx); 4254 goto out; 4255 } 4256 4257 if (zp->z_blksz <= PAGESIZE) { 4258 caddr_t va = zfs_map_page(pp, S_READ); 4259 ASSERT3U(len, <=, PAGESIZE); 4260 dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx); 4261 zfs_unmap_page(pp, va); 4262 } else { 4263 err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, pp, tx); 4264 } 4265 4266 if (err == 0) { 4267 uint64_t mtime[2], ctime[2]; 4268 sa_bulk_attr_t bulk[3]; 4269 int count = 0; 4270 4271 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 4272 &mtime, 16); 4273 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 4274 &ctime, 16); 4275 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 4276 &zp->z_pflags, 8); 4277 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, 4278 B_TRUE); 4279 err = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 4280 ASSERT0(err); 4281 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0); 4282 } 4283 dmu_tx_commit(tx); 4284 4285 out: 4286 pvn_write_done(pp, (err ? B_ERROR : 0) | flags); 4287 if (offp) 4288 *offp = off; 4289 if (lenp) 4290 *lenp = len; 4291 4292 return (err); 4293 } 4294 4295 /* 4296 * Copy the portion of the file indicated from pages into the file. 4297 * The pages are stored in a page list attached to the files vnode. 4298 * 4299 * IN: vp - vnode of file to push page data to. 4300 * off - position in file to put data. 4301 * len - amount of data to write. 4302 * flags - flags to control the operation. 4303 * cr - credentials of caller. 4304 * ct - caller context. 4305 * 4306 * RETURN: 0 on success, error code on failure. 4307 * 4308 * Timestamps: 4309 * vp - ctime|mtime updated 4310 */ 4311 /*ARGSUSED*/ 4312 static int 4313 zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr, 4314 caller_context_t *ct) 4315 { 4316 znode_t *zp = VTOZ(vp); 4317 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4318 page_t *pp; 4319 size_t io_len; 4320 u_offset_t io_off; 4321 uint_t blksz; 4322 rl_t *rl; 4323 int error = 0; 4324 4325 ZFS_ENTER(zfsvfs); 4326 ZFS_VERIFY_ZP(zp); 4327 4328 /* 4329 * There's nothing to do if no data is cached. 4330 */ 4331 if (!vn_has_cached_data(vp)) { 4332 ZFS_EXIT(zfsvfs); 4333 return (0); 4334 } 4335 4336 /* 4337 * Align this request to the file block size in case we kluster. 4338 * XXX - this can result in pretty aggresive locking, which can 4339 * impact simultanious read/write access. One option might be 4340 * to break up long requests (len == 0) into block-by-block 4341 * operations to get narrower locking. 4342 */ 4343 blksz = zp->z_blksz; 4344 if (ISP2(blksz)) 4345 io_off = P2ALIGN_TYPED(off, blksz, u_offset_t); 4346 else 4347 io_off = 0; 4348 if (len > 0 && ISP2(blksz)) 4349 io_len = P2ROUNDUP_TYPED(len + (off - io_off), blksz, size_t); 4350 else 4351 io_len = 0; 4352 4353 if (io_len == 0) { 4354 /* 4355 * Search the entire vp list for pages >= io_off. 4356 */ 4357 rl = zfs_range_lock(zp, io_off, UINT64_MAX, RL_WRITER); 4358 error = pvn_vplist_dirty(vp, io_off, zfs_putapage, flags, cr); 4359 goto out; 4360 } 4361 rl = zfs_range_lock(zp, io_off, io_len, RL_WRITER); 4362 4363 if (off > zp->z_size) { 4364 /* past end of file */ 4365 zfs_range_unlock(rl); 4366 ZFS_EXIT(zfsvfs); 4367 return (0); 4368 } 4369 4370 len = MIN(io_len, P2ROUNDUP(zp->z_size, PAGESIZE) - io_off); 4371 4372 for (off = io_off; io_off < off + len; io_off += io_len) { 4373 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { 4374 pp = page_lookup(vp, io_off, 4375 (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED); 4376 } else { 4377 pp = page_lookup_nowait(vp, io_off, 4378 (flags & B_FREE) ? SE_EXCL : SE_SHARED); 4379 } 4380 4381 if (pp != NULL && pvn_getdirty(pp, flags)) { 4382 int err; 4383 4384 /* 4385 * Found a dirty page to push 4386 */ 4387 err = zfs_putapage(vp, pp, &io_off, &io_len, flags, cr); 4388 if (err) 4389 error = err; 4390 } else { 4391 io_len = PAGESIZE; 4392 } 4393 } 4394 out: 4395 zfs_range_unlock(rl); 4396 if ((flags & B_ASYNC) == 0 || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 4397 zil_commit(zfsvfs->z_log, zp->z_id); 4398 ZFS_EXIT(zfsvfs); 4399 return (error); 4400 } 4401 4402 /*ARGSUSED*/ 4403 void 4404 zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct) 4405 { 4406 znode_t *zp = VTOZ(vp); 4407 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4408 int error; 4409 4410 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER); 4411 if (zp->z_sa_hdl == NULL) { 4412 /* 4413 * The fs has been unmounted, or we did a 4414 * suspend/resume and this file no longer exists. 4415 */ 4416 if (vn_has_cached_data(vp)) { 4417 (void) pvn_vplist_dirty(vp, 0, zfs_null_putapage, 4418 B_INVAL, cr); 4419 } 4420 4421 mutex_enter(&zp->z_lock); 4422 mutex_enter(&vp->v_lock); 4423 ASSERT(vp->v_count == 1); 4424 VN_RELE_LOCKED(vp); 4425 mutex_exit(&vp->v_lock); 4426 mutex_exit(&zp->z_lock); 4427 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4428 zfs_znode_free(zp); 4429 return; 4430 } 4431 4432 /* 4433 * Attempt to push any data in the page cache. If this fails 4434 * we will get kicked out later in zfs_zinactive(). 4435 */ 4436 if (vn_has_cached_data(vp)) { 4437 (void) pvn_vplist_dirty(vp, 0, zfs_putapage, B_INVAL|B_ASYNC, 4438 cr); 4439 } 4440 4441 if (zp->z_atime_dirty && zp->z_unlinked == 0) { 4442 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os); 4443 4444 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 4445 zfs_sa_upgrade_txholds(tx, zp); 4446 error = dmu_tx_assign(tx, TXG_WAIT); 4447 if (error) { 4448 dmu_tx_abort(tx); 4449 } else { 4450 mutex_enter(&zp->z_lock); 4451 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs), 4452 (void *)&zp->z_atime, sizeof (zp->z_atime), tx); 4453 zp->z_atime_dirty = 0; 4454 mutex_exit(&zp->z_lock); 4455 dmu_tx_commit(tx); 4456 } 4457 } 4458 4459 zfs_zinactive(zp); 4460 rw_exit(&zfsvfs->z_teardown_inactive_lock); 4461 } 4462 4463 /* 4464 * Bounds-check the seek operation. 4465 * 4466 * IN: vp - vnode seeking within 4467 * ooff - old file offset 4468 * noffp - pointer to new file offset 4469 * ct - caller context 4470 * 4471 * RETURN: 0 on success, EINVAL if new offset invalid. 4472 */ 4473 /* ARGSUSED */ 4474 static int 4475 zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, 4476 caller_context_t *ct) 4477 { 4478 if (vp->v_type == VDIR) 4479 return (0); 4480 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); 4481 } 4482 4483 /* 4484 * Pre-filter the generic locking function to trap attempts to place 4485 * a mandatory lock on a memory mapped file. 4486 */ 4487 static int 4488 zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset, 4489 flk_callback_t *flk_cbp, cred_t *cr, caller_context_t *ct) 4490 { 4491 znode_t *zp = VTOZ(vp); 4492 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4493 4494 ZFS_ENTER(zfsvfs); 4495 ZFS_VERIFY_ZP(zp); 4496 4497 /* 4498 * We are following the UFS semantics with respect to mapcnt 4499 * here: If we see that the file is mapped already, then we will 4500 * return an error, but we don't worry about races between this 4501 * function and zfs_map(). 4502 */ 4503 if (zp->z_mapcnt > 0 && MANDMODE(zp->z_mode)) { 4504 ZFS_EXIT(zfsvfs); 4505 return (SET_ERROR(EAGAIN)); 4506 } 4507 ZFS_EXIT(zfsvfs); 4508 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct)); 4509 } 4510 4511 /* 4512 * If we can't find a page in the cache, we will create a new page 4513 * and fill it with file data. For efficiency, we may try to fill 4514 * multiple pages at once (klustering) to fill up the supplied page 4515 * list. Note that the pages to be filled are held with an exclusive 4516 * lock to prevent access by other threads while they are being filled. 4517 */ 4518 static int 4519 zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg, 4520 caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw) 4521 { 4522 znode_t *zp = VTOZ(vp); 4523 page_t *pp, *cur_pp; 4524 objset_t *os = zp->z_zfsvfs->z_os; 4525 u_offset_t io_off, total; 4526 size_t io_len; 4527 int err; 4528 4529 if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE) { 4530 /* 4531 * We only have a single page, don't bother klustering 4532 */ 4533 io_off = off; 4534 io_len = PAGESIZE; 4535 pp = page_create_va(vp, io_off, io_len, 4536 PG_EXCL | PG_WAIT, seg, addr); 4537 } else { 4538 /* 4539 * Try to find enough pages to fill the page list 4540 */ 4541 pp = pvn_read_kluster(vp, off, seg, addr, &io_off, 4542 &io_len, off, plsz, 0); 4543 } 4544 if (pp == NULL) { 4545 /* 4546 * The page already exists, nothing to do here. 4547 */ 4548 *pl = NULL; 4549 return (0); 4550 } 4551 4552 /* 4553 * Fill the pages in the kluster. 4554 */ 4555 cur_pp = pp; 4556 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) { 4557 caddr_t va; 4558 4559 ASSERT3U(io_off, ==, cur_pp->p_offset); 4560 va = zfs_map_page(cur_pp, S_WRITE); 4561 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va, 4562 DMU_READ_PREFETCH); 4563 zfs_unmap_page(cur_pp, va); 4564 if (err) { 4565 /* On error, toss the entire kluster */ 4566 pvn_read_done(pp, B_ERROR); 4567 /* convert checksum errors into IO errors */ 4568 if (err == ECKSUM) 4569 err = SET_ERROR(EIO); 4570 return (err); 4571 } 4572 cur_pp = cur_pp->p_next; 4573 } 4574 4575 /* 4576 * Fill in the page list array from the kluster starting 4577 * from the desired offset `off'. 4578 * NOTE: the page list will always be null terminated. 4579 */ 4580 pvn_plist_init(pp, pl, plsz, off, io_len, rw); 4581 ASSERT(pl == NULL || (*pl)->p_offset == off); 4582 4583 return (0); 4584 } 4585 4586 /* 4587 * Return pointers to the pages for the file region [off, off + len] 4588 * in the pl array. If plsz is greater than len, this function may 4589 * also return page pointers from after the specified region 4590 * (i.e. the region [off, off + plsz]). These additional pages are 4591 * only returned if they are already in the cache, or were created as 4592 * part of a klustered read. 4593 * 4594 * IN: vp - vnode of file to get data from. 4595 * off - position in file to get data from. 4596 * len - amount of data to retrieve. 4597 * plsz - length of provided page list. 4598 * seg - segment to obtain pages for. 4599 * addr - virtual address of fault. 4600 * rw - mode of created pages. 4601 * cr - credentials of caller. 4602 * ct - caller context. 4603 * 4604 * OUT: protp - protection mode of created pages. 4605 * pl - list of pages created. 4606 * 4607 * RETURN: 0 on success, error code on failure. 4608 * 4609 * Timestamps: 4610 * vp - atime updated 4611 */ 4612 /* ARGSUSED */ 4613 static int 4614 zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp, 4615 page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, 4616 enum seg_rw rw, cred_t *cr, caller_context_t *ct) 4617 { 4618 znode_t *zp = VTOZ(vp); 4619 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4620 page_t **pl0 = pl; 4621 int err = 0; 4622 4623 /* we do our own caching, faultahead is unnecessary */ 4624 if (pl == NULL) 4625 return (0); 4626 else if (len > plsz) 4627 len = plsz; 4628 else 4629 len = P2ROUNDUP(len, PAGESIZE); 4630 ASSERT(plsz >= len); 4631 4632 ZFS_ENTER(zfsvfs); 4633 ZFS_VERIFY_ZP(zp); 4634 4635 if (protp) 4636 *protp = PROT_ALL; 4637 4638 /* 4639 * Loop through the requested range [off, off + len) looking 4640 * for pages. If we don't find a page, we will need to create 4641 * a new page and fill it with data from the file. 4642 */ 4643 while (len > 0) { 4644 if (*pl = page_lookup(vp, off, SE_SHARED)) 4645 *(pl+1) = NULL; 4646 else if (err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw)) 4647 goto out; 4648 while (*pl) { 4649 ASSERT3U((*pl)->p_offset, ==, off); 4650 off += PAGESIZE; 4651 addr += PAGESIZE; 4652 if (len > 0) { 4653 ASSERT3U(len, >=, PAGESIZE); 4654 len -= PAGESIZE; 4655 } 4656 ASSERT3U(plsz, >=, PAGESIZE); 4657 plsz -= PAGESIZE; 4658 pl++; 4659 } 4660 } 4661 4662 /* 4663 * Fill out the page array with any pages already in the cache. 4664 */ 4665 while (plsz > 0 && 4666 (*pl++ = page_lookup_nowait(vp, off, SE_SHARED))) { 4667 off += PAGESIZE; 4668 plsz -= PAGESIZE; 4669 } 4670 out: 4671 if (err) { 4672 /* 4673 * Release any pages we have previously locked. 4674 */ 4675 while (pl > pl0) 4676 page_unlock(*--pl); 4677 } else { 4678 ZFS_ACCESSTIME_STAMP(zfsvfs, zp); 4679 } 4680 4681 *pl = NULL; 4682 4683 ZFS_EXIT(zfsvfs); 4684 return (err); 4685 } 4686 4687 /* 4688 * Request a memory map for a section of a file. This code interacts 4689 * with common code and the VM system as follows: 4690 * 4691 * - common code calls mmap(), which ends up in smmap_common() 4692 * - this calls VOP_MAP(), which takes you into (say) zfs 4693 * - zfs_map() calls as_map(), passing segvn_create() as the callback 4694 * - segvn_create() creates the new segment and calls VOP_ADDMAP() 4695 * - zfs_addmap() updates z_mapcnt 4696 */ 4697 /*ARGSUSED*/ 4698 static int 4699 zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp, 4700 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, 4701 caller_context_t *ct) 4702 { 4703 znode_t *zp = VTOZ(vp); 4704 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4705 segvn_crargs_t vn_a; 4706 int error; 4707 4708 ZFS_ENTER(zfsvfs); 4709 ZFS_VERIFY_ZP(zp); 4710 4711 /* 4712 * Note: ZFS_READONLY is handled in zfs_zaccess_common. 4713 */ 4714 4715 if ((prot & PROT_WRITE) && (zp->z_pflags & 4716 (ZFS_IMMUTABLE | ZFS_APPENDONLY))) { 4717 ZFS_EXIT(zfsvfs); 4718 return (SET_ERROR(EPERM)); 4719 } 4720 4721 if ((prot & (PROT_READ | PROT_EXEC)) && 4722 (zp->z_pflags & ZFS_AV_QUARANTINED)) { 4723 ZFS_EXIT(zfsvfs); 4724 return (SET_ERROR(EACCES)); 4725 } 4726 4727 if (vp->v_flag & VNOMAP) { 4728 ZFS_EXIT(zfsvfs); 4729 return (SET_ERROR(ENOSYS)); 4730 } 4731 4732 if (off < 0 || len > MAXOFFSET_T - off) { 4733 ZFS_EXIT(zfsvfs); 4734 return (SET_ERROR(ENXIO)); 4735 } 4736 4737 if (vp->v_type != VREG) { 4738 ZFS_EXIT(zfsvfs); 4739 return (SET_ERROR(ENODEV)); 4740 } 4741 4742 /* 4743 * If file is locked, disallow mapping. 4744 */ 4745 if (MANDMODE(zp->z_mode) && vn_has_flocks(vp)) { 4746 ZFS_EXIT(zfsvfs); 4747 return (SET_ERROR(EAGAIN)); 4748 } 4749 4750 as_rangelock(as); 4751 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags); 4752 if (error != 0) { 4753 as_rangeunlock(as); 4754 ZFS_EXIT(zfsvfs); 4755 return (error); 4756 } 4757 4758 vn_a.vp = vp; 4759 vn_a.offset = (u_offset_t)off; 4760 vn_a.type = flags & MAP_TYPE; 4761 vn_a.prot = prot; 4762 vn_a.maxprot = maxprot; 4763 vn_a.cred = cr; 4764 vn_a.amp = NULL; 4765 vn_a.flags = flags & ~MAP_TYPE; 4766 vn_a.szc = 0; 4767 vn_a.lgrp_mem_policy_flags = 0; 4768 4769 error = as_map(as, *addrp, len, segvn_create, &vn_a); 4770 4771 as_rangeunlock(as); 4772 ZFS_EXIT(zfsvfs); 4773 return (error); 4774 } 4775 4776 /* ARGSUSED */ 4777 static int 4778 zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 4779 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr, 4780 caller_context_t *ct) 4781 { 4782 uint64_t pages = btopr(len); 4783 4784 atomic_add_64(&VTOZ(vp)->z_mapcnt, pages); 4785 return (0); 4786 } 4787 4788 /* 4789 * The reason we push dirty pages as part of zfs_delmap() is so that we get a 4790 * more accurate mtime for the associated file. Since we don't have a way of 4791 * detecting when the data was actually modified, we have to resort to 4792 * heuristics. If an explicit msync() is done, then we mark the mtime when the 4793 * last page is pushed. The problem occurs when the msync() call is omitted, 4794 * which by far the most common case: 4795 * 4796 * open() 4797 * mmap() 4798 * <modify memory> 4799 * munmap() 4800 * close() 4801 * <time lapse> 4802 * putpage() via fsflush 4803 * 4804 * If we wait until fsflush to come along, we can have a modification time that 4805 * is some arbitrary point in the future. In order to prevent this in the 4806 * common case, we flush pages whenever a (MAP_SHARED, PROT_WRITE) mapping is 4807 * torn down. 4808 */ 4809 /* ARGSUSED */ 4810 static int 4811 zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr, 4812 size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr, 4813 caller_context_t *ct) 4814 { 4815 uint64_t pages = btopr(len); 4816 4817 ASSERT3U(VTOZ(vp)->z_mapcnt, >=, pages); 4818 atomic_add_64(&VTOZ(vp)->z_mapcnt, -pages); 4819 4820 if ((flags & MAP_SHARED) && (prot & PROT_WRITE) && 4821 vn_has_cached_data(vp)) 4822 (void) VOP_PUTPAGE(vp, off, len, B_ASYNC, cr, ct); 4823 4824 return (0); 4825 } 4826 4827 /* 4828 * Free or allocate space in a file. Currently, this function only 4829 * supports the `F_FREESP' command. However, this command is somewhat 4830 * misnamed, as its functionality includes the ability to allocate as 4831 * well as free space. 4832 * 4833 * IN: vp - vnode of file to free data in. 4834 * cmd - action to take (only F_FREESP supported). 4835 * bfp - section of file to free/alloc. 4836 * flag - current file open mode flags. 4837 * offset - current file offset. 4838 * cr - credentials of caller [UNUSED]. 4839 * ct - caller context. 4840 * 4841 * RETURN: 0 on success, error code on failure. 4842 * 4843 * Timestamps: 4844 * vp - ctime|mtime updated 4845 */ 4846 /* ARGSUSED */ 4847 static int 4848 zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag, 4849 offset_t offset, cred_t *cr, caller_context_t *ct) 4850 { 4851 znode_t *zp = VTOZ(vp); 4852 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4853 uint64_t off, len; 4854 int error; 4855 4856 ZFS_ENTER(zfsvfs); 4857 ZFS_VERIFY_ZP(zp); 4858 4859 if (cmd != F_FREESP) { 4860 ZFS_EXIT(zfsvfs); 4861 return (SET_ERROR(EINVAL)); 4862 } 4863 4864 /* 4865 * In a case vp->v_vfsp != zp->z_zfsvfs->z_vfs (e.g. snapshots) our 4866 * callers might not be able to detect properly that we are read-only, 4867 * so check it explicitly here. 4868 */ 4869 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { 4870 ZFS_EXIT(zfsvfs); 4871 return (SET_ERROR(EROFS)); 4872 } 4873 4874 if (error = convoff(vp, bfp, 0, offset)) { 4875 ZFS_EXIT(zfsvfs); 4876 return (error); 4877 } 4878 4879 if (bfp->l_len < 0) { 4880 ZFS_EXIT(zfsvfs); 4881 return (SET_ERROR(EINVAL)); 4882 } 4883 4884 off = bfp->l_start; 4885 len = bfp->l_len; /* 0 means from off to end of file */ 4886 4887 error = zfs_freesp(zp, off, len, flag, TRUE); 4888 4889 if (error == 0 && off == 0 && len == 0) 4890 vnevent_truncate(ZTOV(zp), ct); 4891 4892 ZFS_EXIT(zfsvfs); 4893 return (error); 4894 } 4895 4896 /*ARGSUSED*/ 4897 static int 4898 zfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct) 4899 { 4900 znode_t *zp = VTOZ(vp); 4901 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 4902 uint32_t gen; 4903 uint64_t gen64; 4904 uint64_t object = zp->z_id; 4905 zfid_short_t *zfid; 4906 int size, i, error; 4907 4908 ZFS_ENTER(zfsvfs); 4909 ZFS_VERIFY_ZP(zp); 4910 4911 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), 4912 &gen64, sizeof (uint64_t))) != 0) { 4913 ZFS_EXIT(zfsvfs); 4914 return (error); 4915 } 4916 4917 gen = (uint32_t)gen64; 4918 4919 size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN; 4920 if (fidp->fid_len < size) { 4921 fidp->fid_len = size; 4922 ZFS_EXIT(zfsvfs); 4923 return (SET_ERROR(ENOSPC)); 4924 } 4925 4926 zfid = (zfid_short_t *)fidp; 4927 4928 zfid->zf_len = size; 4929 4930 for (i = 0; i < sizeof (zfid->zf_object); i++) 4931 zfid->zf_object[i] = (uint8_t)(object >> (8 * i)); 4932 4933 /* Must have a non-zero generation number to distinguish from .zfs */ 4934 if (gen == 0) 4935 gen = 1; 4936 for (i = 0; i < sizeof (zfid->zf_gen); i++) 4937 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i)); 4938 4939 if (size == LONG_FID_LEN) { 4940 uint64_t objsetid = dmu_objset_id(zfsvfs->z_os); 4941 zfid_long_t *zlfid; 4942 4943 zlfid = (zfid_long_t *)fidp; 4944 4945 for (i = 0; i < sizeof (zlfid->zf_setid); i++) 4946 zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i)); 4947 4948 /* XXX - this should be the generation number for the objset */ 4949 for (i = 0; i < sizeof (zlfid->zf_setgen); i++) 4950 zlfid->zf_setgen[i] = 0; 4951 } 4952 4953 ZFS_EXIT(zfsvfs); 4954 return (0); 4955 } 4956 4957 static int 4958 zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr, 4959 caller_context_t *ct) 4960 { 4961 znode_t *zp, *xzp; 4962 zfsvfs_t *zfsvfs; 4963 zfs_dirlock_t *dl; 4964 int error; 4965 4966 switch (cmd) { 4967 case _PC_LINK_MAX: 4968 *valp = ULONG_MAX; 4969 return (0); 4970 4971 case _PC_FILESIZEBITS: 4972 *valp = 64; 4973 return (0); 4974 4975 case _PC_XATTR_EXISTS: 4976 zp = VTOZ(vp); 4977 zfsvfs = zp->z_zfsvfs; 4978 ZFS_ENTER(zfsvfs); 4979 ZFS_VERIFY_ZP(zp); 4980 *valp = 0; 4981 error = zfs_dirent_lock(&dl, zp, "", &xzp, 4982 ZXATTR | ZEXISTS | ZSHARED, NULL, NULL); 4983 if (error == 0) { 4984 zfs_dirent_unlock(dl); 4985 if (!zfs_dirempty(xzp)) 4986 *valp = 1; 4987 VN_RELE(ZTOV(xzp)); 4988 } else if (error == ENOENT) { 4989 /* 4990 * If there aren't extended attributes, it's the 4991 * same as having zero of them. 4992 */ 4993 error = 0; 4994 } 4995 ZFS_EXIT(zfsvfs); 4996 return (error); 4997 4998 case _PC_SATTR_ENABLED: 4999 case _PC_SATTR_EXISTS: 5000 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) && 5001 (vp->v_type == VREG || vp->v_type == VDIR); 5002 return (0); 5003 5004 case _PC_ACCESS_FILTERING: 5005 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_ACCESS_FILTER) && 5006 vp->v_type == VDIR; 5007 return (0); 5008 5009 case _PC_ACL_ENABLED: 5010 *valp = _ACL_ACE_ENABLED; 5011 return (0); 5012 5013 case _PC_MIN_HOLE_SIZE: 5014 *valp = (ulong_t)SPA_MINBLOCKSIZE; 5015 return (0); 5016 5017 case _PC_TIMESTAMP_RESOLUTION: 5018 /* nanosecond timestamp resolution */ 5019 *valp = 1L; 5020 return (0); 5021 5022 default: 5023 return (fs_pathconf(vp, cmd, valp, cr, ct)); 5024 } 5025 } 5026 5027 /*ARGSUSED*/ 5028 static int 5029 zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr, 5030 caller_context_t *ct) 5031 { 5032 znode_t *zp = VTOZ(vp); 5033 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5034 int error; 5035 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 5036 5037 ZFS_ENTER(zfsvfs); 5038 ZFS_VERIFY_ZP(zp); 5039 error = zfs_getacl(zp, vsecp, skipaclchk, cr); 5040 ZFS_EXIT(zfsvfs); 5041 5042 return (error); 5043 } 5044 5045 /*ARGSUSED*/ 5046 static int 5047 zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr, 5048 caller_context_t *ct) 5049 { 5050 znode_t *zp = VTOZ(vp); 5051 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5052 int error; 5053 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE; 5054 zilog_t *zilog = zfsvfs->z_log; 5055 5056 ZFS_ENTER(zfsvfs); 5057 ZFS_VERIFY_ZP(zp); 5058 5059 error = zfs_setacl(zp, vsecp, skipaclchk, cr); 5060 5061 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS) 5062 zil_commit(zilog, 0); 5063 5064 ZFS_EXIT(zfsvfs); 5065 return (error); 5066 } 5067 5068 /* 5069 * The smallest read we may consider to loan out an arcbuf. 5070 * This must be a power of 2. 5071 */ 5072 int zcr_blksz_min = (1 << 10); /* 1K */ 5073 /* 5074 * If set to less than the file block size, allow loaning out of an 5075 * arcbuf for a partial block read. This must be a power of 2. 5076 */ 5077 int zcr_blksz_max = (1 << 17); /* 128K */ 5078 5079 /*ARGSUSED*/ 5080 static int 5081 zfs_reqzcbuf(vnode_t *vp, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr, 5082 caller_context_t *ct) 5083 { 5084 znode_t *zp = VTOZ(vp); 5085 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 5086 int max_blksz = zfsvfs->z_max_blksz; 5087 uio_t *uio = &xuio->xu_uio; 5088 ssize_t size = uio->uio_resid; 5089 offset_t offset = uio->uio_loffset; 5090 int blksz; 5091 int fullblk, i; 5092 arc_buf_t *abuf; 5093 ssize_t maxsize; 5094 int preamble, postamble; 5095 5096 if (xuio->xu_type != UIOTYPE_ZEROCOPY) 5097 return (SET_ERROR(EINVAL)); 5098 5099 ZFS_ENTER(zfsvfs); 5100 ZFS_VERIFY_ZP(zp); 5101 switch (ioflag) { 5102 case UIO_WRITE: 5103 /* 5104 * Loan out an arc_buf for write if write size is bigger than 5105 * max_blksz, and the file's block size is also max_blksz. 5106 */ 5107 blksz = max_blksz; 5108 if (size < blksz || zp->z_blksz != blksz) { 5109 ZFS_EXIT(zfsvfs); 5110 return (SET_ERROR(EINVAL)); 5111 } 5112 /* 5113 * Caller requests buffers for write before knowing where the 5114 * write offset might be (e.g. NFS TCP write). 5115 */ 5116 if (offset == -1) { 5117 preamble = 0; 5118 } else { 5119 preamble = P2PHASE(offset, blksz); 5120 if (preamble) { 5121 preamble = blksz - preamble; 5122 size -= preamble; 5123 } 5124 } 5125 5126 postamble = P2PHASE(size, blksz); 5127 size -= postamble; 5128 5129 fullblk = size / blksz; 5130 (void) dmu_xuio_init(xuio, 5131 (preamble != 0) + fullblk + (postamble != 0)); 5132 DTRACE_PROBE3(zfs_reqzcbuf_align, int, preamble, 5133 int, postamble, int, 5134 (preamble != 0) + fullblk + (postamble != 0)); 5135 5136 /* 5137 * Have to fix iov base/len for partial buffers. They 5138 * currently represent full arc_buf's. 5139 */ 5140 if (preamble) { 5141 /* data begins in the middle of the arc_buf */ 5142 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5143 blksz); 5144 ASSERT(abuf); 5145 (void) dmu_xuio_add(xuio, abuf, 5146 blksz - preamble, preamble); 5147 } 5148 5149 for (i = 0; i < fullblk; i++) { 5150 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5151 blksz); 5152 ASSERT(abuf); 5153 (void) dmu_xuio_add(xuio, abuf, 0, blksz); 5154 } 5155 5156 if (postamble) { 5157 /* data ends in the middle of the arc_buf */ 5158 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl), 5159 blksz); 5160 ASSERT(abuf); 5161 (void) dmu_xuio_add(xuio, abuf, 0, postamble); 5162 } 5163 break; 5164 case UIO_READ: 5165 /* 5166 * Loan out an arc_buf for read if the read size is larger than 5167 * the current file block size. Block alignment is not 5168 * considered. Partial arc_buf will be loaned out for read. 5169 */ 5170 blksz = zp->z_blksz; 5171 if (blksz < zcr_blksz_min) 5172 blksz = zcr_blksz_min; 5173 if (blksz > zcr_blksz_max) 5174 blksz = zcr_blksz_max; 5175 /* avoid potential complexity of dealing with it */ 5176 if (blksz > max_blksz) { 5177 ZFS_EXIT(zfsvfs); 5178 return (SET_ERROR(EINVAL)); 5179 } 5180 5181 maxsize = zp->z_size - uio->uio_loffset; 5182 if (size > maxsize) 5183 size = maxsize; 5184 5185 if (size < blksz || vn_has_cached_data(vp)) { 5186 ZFS_EXIT(zfsvfs); 5187 return (SET_ERROR(EINVAL)); 5188 } 5189 break; 5190 default: 5191 ZFS_EXIT(zfsvfs); 5192 return (SET_ERROR(EINVAL)); 5193 } 5194 5195 uio->uio_extflg = UIO_XUIO; 5196 XUIO_XUZC_RW(xuio) = ioflag; 5197 ZFS_EXIT(zfsvfs); 5198 return (0); 5199 } 5200 5201 /*ARGSUSED*/ 5202 static int 5203 zfs_retzcbuf(vnode_t *vp, xuio_t *xuio, cred_t *cr, caller_context_t *ct) 5204 { 5205 int i; 5206 arc_buf_t *abuf; 5207 int ioflag = XUIO_XUZC_RW(xuio); 5208 5209 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY); 5210 5211 i = dmu_xuio_cnt(xuio); 5212 while (i-- > 0) { 5213 abuf = dmu_xuio_arcbuf(xuio, i); 5214 /* 5215 * if abuf == NULL, it must be a write buffer 5216 * that has been returned in zfs_write(). 5217 */ 5218 if (abuf) 5219 dmu_return_arcbuf(abuf); 5220 ASSERT(abuf || ioflag == UIO_WRITE); 5221 } 5222 5223 dmu_xuio_fini(xuio); 5224 return (0); 5225 } 5226 5227 /* 5228 * Predeclare these here so that the compiler assumes that 5229 * this is an "old style" function declaration that does 5230 * not include arguments => we won't get type mismatch errors 5231 * in the initializations that follow. 5232 */ 5233 static int zfs_inval(); 5234 static int zfs_isdir(); 5235 5236 static int 5237 zfs_inval() 5238 { 5239 return (SET_ERROR(EINVAL)); 5240 } 5241 5242 static int 5243 zfs_isdir() 5244 { 5245 return (SET_ERROR(EISDIR)); 5246 } 5247 /* 5248 * Directory vnode operations template 5249 */ 5250 vnodeops_t *zfs_dvnodeops; 5251 const fs_operation_def_t zfs_dvnodeops_template[] = { 5252 VOPNAME_OPEN, { .vop_open = zfs_open }, 5253 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5254 VOPNAME_READ, { .error = zfs_isdir }, 5255 VOPNAME_WRITE, { .error = zfs_isdir }, 5256 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5257 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5258 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5259 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5260 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5261 VOPNAME_CREATE, { .vop_create = zfs_create }, 5262 VOPNAME_REMOVE, { .vop_remove = zfs_remove }, 5263 VOPNAME_LINK, { .vop_link = zfs_link }, 5264 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5265 VOPNAME_MKDIR, { .vop_mkdir = zfs_mkdir }, 5266 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir }, 5267 VOPNAME_READDIR, { .vop_readdir = zfs_readdir }, 5268 VOPNAME_SYMLINK, { .vop_symlink = zfs_symlink }, 5269 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5270 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5271 VOPNAME_FID, { .vop_fid = zfs_fid }, 5272 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5273 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5274 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5275 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5276 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5277 NULL, NULL 5278 }; 5279 5280 /* 5281 * Regular file vnode operations template 5282 */ 5283 vnodeops_t *zfs_fvnodeops; 5284 const fs_operation_def_t zfs_fvnodeops_template[] = { 5285 VOPNAME_OPEN, { .vop_open = zfs_open }, 5286 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5287 VOPNAME_READ, { .vop_read = zfs_read }, 5288 VOPNAME_WRITE, { .vop_write = zfs_write }, 5289 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5290 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5291 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5292 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5293 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5294 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5295 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5296 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5297 VOPNAME_FID, { .vop_fid = zfs_fid }, 5298 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5299 VOPNAME_FRLOCK, { .vop_frlock = zfs_frlock }, 5300 VOPNAME_SPACE, { .vop_space = zfs_space }, 5301 VOPNAME_GETPAGE, { .vop_getpage = zfs_getpage }, 5302 VOPNAME_PUTPAGE, { .vop_putpage = zfs_putpage }, 5303 VOPNAME_MAP, { .vop_map = zfs_map }, 5304 VOPNAME_ADDMAP, { .vop_addmap = zfs_addmap }, 5305 VOPNAME_DELMAP, { .vop_delmap = zfs_delmap }, 5306 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5307 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5308 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5309 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5310 VOPNAME_REQZCBUF, { .vop_reqzcbuf = zfs_reqzcbuf }, 5311 VOPNAME_RETZCBUF, { .vop_retzcbuf = zfs_retzcbuf }, 5312 NULL, NULL 5313 }; 5314 5315 /* 5316 * Symbolic link vnode operations template 5317 */ 5318 vnodeops_t *zfs_symvnodeops; 5319 const fs_operation_def_t zfs_symvnodeops_template[] = { 5320 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5321 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5322 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5323 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5324 VOPNAME_READLINK, { .vop_readlink = zfs_readlink }, 5325 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5326 VOPNAME_FID, { .vop_fid = zfs_fid }, 5327 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5328 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5329 NULL, NULL 5330 }; 5331 5332 /* 5333 * special share hidden files vnode operations template 5334 */ 5335 vnodeops_t *zfs_sharevnodeops; 5336 const fs_operation_def_t zfs_sharevnodeops_template[] = { 5337 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5338 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5339 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5340 VOPNAME_FID, { .vop_fid = zfs_fid }, 5341 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5342 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5343 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5344 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5345 NULL, NULL 5346 }; 5347 5348 /* 5349 * Extended attribute directory vnode operations template 5350 * 5351 * This template is identical to the directory vnodes 5352 * operation template except for restricted operations: 5353 * VOP_MKDIR() 5354 * VOP_SYMLINK() 5355 * 5356 * Note that there are other restrictions embedded in: 5357 * zfs_create() - restrict type to VREG 5358 * zfs_link() - no links into/out of attribute space 5359 * zfs_rename() - no moves into/out of attribute space 5360 */ 5361 vnodeops_t *zfs_xdvnodeops; 5362 const fs_operation_def_t zfs_xdvnodeops_template[] = { 5363 VOPNAME_OPEN, { .vop_open = zfs_open }, 5364 VOPNAME_CLOSE, { .vop_close = zfs_close }, 5365 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl }, 5366 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr }, 5367 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr }, 5368 VOPNAME_ACCESS, { .vop_access = zfs_access }, 5369 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup }, 5370 VOPNAME_CREATE, { .vop_create = zfs_create }, 5371 VOPNAME_REMOVE, { .vop_remove = zfs_remove }, 5372 VOPNAME_LINK, { .vop_link = zfs_link }, 5373 VOPNAME_RENAME, { .vop_rename = zfs_rename }, 5374 VOPNAME_MKDIR, { .error = zfs_inval }, 5375 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir }, 5376 VOPNAME_READDIR, { .vop_readdir = zfs_readdir }, 5377 VOPNAME_SYMLINK, { .error = zfs_inval }, 5378 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync }, 5379 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5380 VOPNAME_FID, { .vop_fid = zfs_fid }, 5381 VOPNAME_SEEK, { .vop_seek = zfs_seek }, 5382 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5383 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr }, 5384 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr }, 5385 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support }, 5386 NULL, NULL 5387 }; 5388 5389 /* 5390 * Error vnode operations template 5391 */ 5392 vnodeops_t *zfs_evnodeops; 5393 const fs_operation_def_t zfs_evnodeops_template[] = { 5394 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive }, 5395 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf }, 5396 NULL, NULL 5397 }; 5398