1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
25 */
26
27 /* Portions Copyright 2007 Jeremy Teo */
28 /* Portions Copyright 2010 Robert Milkowski */
29
30 #include <sys/types.h>
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/systm.h>
34 #include <sys/sysmacros.h>
35 #include <sys/resource.h>
36 #include <sys/vfs.h>
37 #include <sys/vfs_opreg.h>
38 #include <sys/vnode.h>
39 #include <sys/file.h>
40 #include <sys/stat.h>
41 #include <sys/kmem.h>
42 #include <sys/taskq.h>
43 #include <sys/uio.h>
44 #include <sys/vmsystm.h>
45 #include <sys/atomic.h>
46 #include <sys/vm.h>
47 #include <vm/seg_vn.h>
48 #include <vm/pvn.h>
49 #include <vm/as.h>
50 #include <vm/kpm.h>
51 #include <vm/seg_kpm.h>
52 #include <sys/mman.h>
53 #include <sys/pathname.h>
54 #include <sys/cmn_err.h>
55 #include <sys/errno.h>
56 #include <sys/unistd.h>
57 #include <sys/zfs_dir.h>
58 #include <sys/zfs_acl.h>
59 #include <sys/zfs_ioctl.h>
60 #include <sys/fs/zfs.h>
61 #include <sys/dmu.h>
62 #include <sys/dmu_objset.h>
63 #include <sys/spa.h>
64 #include <sys/txg.h>
65 #include <sys/dbuf.h>
66 #include <sys/zap.h>
67 #include <sys/sa.h>
68 #include <sys/dirent.h>
69 #include <sys/policy.h>
70 #include <sys/sunddi.h>
71 #include <sys/filio.h>
72 #include <sys/sid.h>
73 #include "fs/fs_subr.h"
74 #include <sys/zfs_ctldir.h>
75 #include <sys/zfs_fuid.h>
76 #include <sys/zfs_sa.h>
77 #include <sys/dnlc.h>
78 #include <sys/zfs_rlock.h>
79 #include <sys/extdirent.h>
80 #include <sys/kidmap.h>
81 #include <sys/cred.h>
82 #include <sys/attr.h>
83
84 /*
85 * Programming rules.
86 *
87 * Each vnode op performs some logical unit of work. To do this, the ZPL must
88 * properly lock its in-core state, create a DMU transaction, do the work,
89 * record this work in the intent log (ZIL), commit the DMU transaction,
90 * and wait for the intent log to commit if it is a synchronous operation.
91 * Moreover, the vnode ops must work in both normal and log replay context.
92 * The ordering of events is important to avoid deadlocks and references
93 * to freed memory. The example below illustrates the following Big Rules:
94 *
95 * (1) A check must be made in each zfs thread for a mounted file system.
96 * This is done avoiding races using ZFS_ENTER(zfsvfs).
97 * A ZFS_EXIT(zfsvfs) is needed before all returns. Any znodes
98 * must be checked with ZFS_VERIFY_ZP(zp). Both of these macros
99 * can return EIO from the calling function.
100 *
101 * (2) VN_RELE() should always be the last thing except for zil_commit()
102 * (if necessary) and ZFS_EXIT(). This is for 3 reasons:
103 * First, if it's the last reference, the vnode/znode
104 * can be freed, so the zp may point to freed memory. Second, the last
105 * reference will call zfs_zinactive(), which may induce a lot of work --
106 * pushing cached pages (which acquires range locks) and syncing out
107 * cached atime changes. Third, zfs_zinactive() may require a new tx,
108 * which could deadlock the system if you were already holding one.
109 * If you must call VN_RELE() within a tx then use VN_RELE_ASYNC().
110 *
111 * (3) All range locks must be grabbed before calling dmu_tx_assign(),
112 * as they can span dmu_tx_assign() calls.
113 *
114 * (4) If ZPL locks are held, pass TXG_NOWAIT as the second argument to
115 * dmu_tx_assign(). This is critical because we don't want to block
116 * while holding locks.
117 *
118 * If no ZPL locks are held (aside from ZFS_ENTER()), use TXG_WAIT. This
119 * reduces lock contention and CPU usage when we must wait (note that if
120 * throughput is constrained by the storage, nearly every transaction
121 * must wait).
122 *
123 * Note, in particular, that if a lock is sometimes acquired before
124 * the tx assigns, and sometimes after (e.g. z_lock), then failing
125 * to use a non-blocking assign can deadlock the system. The scenario:
126 *
127 * Thread A has grabbed a lock before calling dmu_tx_assign().
128 * Thread B is in an already-assigned tx, and blocks for this lock.
129 * Thread A calls dmu_tx_assign(TXG_WAIT) and blocks in txg_wait_open()
130 * forever, because the previous txg can't quiesce until B's tx commits.
131 *
132 * If dmu_tx_assign() returns ERESTART and zfsvfs->z_assign is TXG_NOWAIT,
133 * then drop all locks, call dmu_tx_wait(), and try again. On subsequent
134 * calls to dmu_tx_assign(), pass TXG_WAITED rather than TXG_NOWAIT,
135 * to indicate that this operation has already called dmu_tx_wait().
136 * This will ensure that we don't retry forever, waiting a short bit
137 * each time.
138 *
139 * (5) If the operation succeeded, generate the intent log entry for it
140 * before dropping locks. This ensures that the ordering of events
141 * in the intent log matches the order in which they actually occurred.
142 * During ZIL replay the zfs_log_* functions will update the sequence
143 * number to indicate the zil transaction has replayed.
144 *
145 * (6) At the end of each vnode op, the DMU tx must always commit,
146 * regardless of whether there were any errors.
147 *
148 * (7) After dropping all locks, invoke zil_commit(zilog, foid)
149 * to ensure that synchronous semantics are provided when necessary.
150 *
151 * In general, this is how things should be ordered in each vnode op:
152 *
153 * ZFS_ENTER(zfsvfs); // exit if unmounted
154 * top:
155 * zfs_dirent_lock(&dl, ...) // lock directory entry (may VN_HOLD())
156 * rw_enter(...); // grab any other locks you need
157 * tx = dmu_tx_create(...); // get DMU tx
158 * dmu_tx_hold_*(); // hold each object you might modify
159 * error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
160 * if (error) {
161 * rw_exit(...); // drop locks
162 * zfs_dirent_unlock(dl); // unlock directory entry
163 * VN_RELE(...); // release held vnodes
164 * if (error == ERESTART) {
165 * waited = B_TRUE;
166 * dmu_tx_wait(tx);
167 * dmu_tx_abort(tx);
168 * goto top;
169 * }
170 * dmu_tx_abort(tx); // abort DMU tx
171 * ZFS_EXIT(zfsvfs); // finished in zfs
172 * return (error); // really out of space
173 * }
174 * error = do_real_work(); // do whatever this VOP does
175 * if (error == 0)
176 * zfs_log_*(...); // on success, make ZIL entry
177 * dmu_tx_commit(tx); // commit DMU tx -- error or not
178 * rw_exit(...); // drop locks
179 * zfs_dirent_unlock(dl); // unlock directory entry
180 * VN_RELE(...); // release held vnodes
181 * zil_commit(zilog, foid); // synchronous when necessary
182 * ZFS_EXIT(zfsvfs); // finished in zfs
183 * return (error); // done, report error
184 */
185
186 /* ARGSUSED */
187 static int
188 zfs_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
189 {
190 znode_t *zp = VTOZ(*vpp);
191 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
192
193 ZFS_ENTER(zfsvfs);
194 ZFS_VERIFY_ZP(zp);
195
196 if ((flag & FWRITE) && (zp->z_pflags & ZFS_APPENDONLY) &&
197 ((flag & FAPPEND) == 0)) {
198 ZFS_EXIT(zfsvfs);
199 return (SET_ERROR(EPERM));
200 }
201
202 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
203 ZTOV(zp)->v_type == VREG &&
204 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0) {
205 if (fs_vscan(*vpp, cr, 0) != 0) {
206 ZFS_EXIT(zfsvfs);
207 return (SET_ERROR(EACCES));
208 }
209 }
210
211 /* Keep a count of the synchronous opens in the znode */
212 if (flag & (FSYNC | FDSYNC))
213 atomic_inc_32(&zp->z_sync_cnt);
214
215 ZFS_EXIT(zfsvfs);
216 return (0);
217 }
218
219 /* ARGSUSED */
220 static int
221 zfs_close(vnode_t *vp, int flag, int count, offset_t offset, cred_t *cr,
222 caller_context_t *ct)
223 {
224 znode_t *zp = VTOZ(vp);
225 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
226
227 /*
228 * Clean up any locks held by this process on the vp.
229 */
230 cleanlocks(vp, ddi_get_pid(), 0);
231 cleanshares(vp, ddi_get_pid());
232
233 ZFS_ENTER(zfsvfs);
234 ZFS_VERIFY_ZP(zp);
235
236 /* Decrement the synchronous opens in the znode */
237 if ((flag & (FSYNC | FDSYNC)) && (count == 1))
238 atomic_dec_32(&zp->z_sync_cnt);
239
240 if (!zfs_has_ctldir(zp) && zp->z_zfsvfs->z_vscan &&
241 ZTOV(zp)->v_type == VREG &&
242 !(zp->z_pflags & ZFS_AV_QUARANTINED) && zp->z_size > 0)
243 VERIFY(fs_vscan(vp, cr, 1) == 0);
244
245 ZFS_EXIT(zfsvfs);
246 return (0);
247 }
248
249 /*
250 * Lseek support for finding holes (cmd == _FIO_SEEK_HOLE) and
251 * data (cmd == _FIO_SEEK_DATA). "off" is an in/out parameter.
252 */
253 static int
254 zfs_holey(vnode_t *vp, int cmd, offset_t *off)
255 {
256 znode_t *zp = VTOZ(vp);
257 uint64_t noff = (uint64_t)*off; /* new offset */
258 uint64_t file_sz;
259 int error;
260 boolean_t hole;
261
262 file_sz = zp->z_size;
263 if (noff >= file_sz) {
264 return (SET_ERROR(ENXIO));
265 }
266
267 if (cmd == _FIO_SEEK_HOLE)
268 hole = B_TRUE;
269 else
270 hole = B_FALSE;
271
272 error = dmu_offset_next(zp->z_zfsvfs->z_os, zp->z_id, hole, &noff);
273
274 if (error == ESRCH)
275 return (SET_ERROR(ENXIO));
276
277 /*
278 * We could find a hole that begins after the logical end-of-file,
279 * because dmu_offset_next() only works on whole blocks. If the
280 * EOF falls mid-block, then indicate that the "virtual hole"
281 * at the end of the file begins at the logical EOF, rather than
282 * at the end of the last block.
283 */
284 if (noff > file_sz) {
285 ASSERT(hole);
286 noff = file_sz;
287 }
288
289 if (noff < *off)
290 return (error);
291 *off = noff;
292 return (error);
293 }
294
295 /* ARGSUSED */
296 static int
297 zfs_ioctl(vnode_t *vp, int com, intptr_t data, int flag, cred_t *cred,
298 int *rvalp, caller_context_t *ct)
299 {
300 offset_t off;
301 offset_t ndata;
302 dmu_object_info_t doi;
303 int error;
304 zfsvfs_t *zfsvfs;
305 znode_t *zp;
306
307 switch (com) {
308 case _FIOFFS:
309 {
310 return (zfs_sync(vp->v_vfsp, 0, cred));
311
312 /*
313 * The following two ioctls are used by bfu. Faking out,
314 * necessary to avoid bfu errors.
315 */
316 }
317 case _FIOGDIO:
318 case _FIOSDIO:
319 {
320 return (0);
321 }
322
323 case _FIO_SEEK_DATA:
324 case _FIO_SEEK_HOLE:
325 {
326 if (ddi_copyin((void *)data, &off, sizeof (off), flag))
327 return (SET_ERROR(EFAULT));
328
329 zp = VTOZ(vp);
330 zfsvfs = zp->z_zfsvfs;
331 ZFS_ENTER(zfsvfs);
332 ZFS_VERIFY_ZP(zp);
333
334 /* offset parameter is in/out */
335 error = zfs_holey(vp, com, &off);
336 ZFS_EXIT(zfsvfs);
337 if (error)
338 return (error);
339 if (ddi_copyout(&off, (void *)data, sizeof (off), flag))
340 return (SET_ERROR(EFAULT));
341 return (0);
342 }
343 case _FIO_COUNT_FILLED:
344 {
345 /*
346 * _FIO_COUNT_FILLED adds a new ioctl command which
347 * exposes the number of filled blocks in a
348 * ZFS object.
349 */
350 zp = VTOZ(vp);
351 zfsvfs = zp->z_zfsvfs;
352 ZFS_ENTER(zfsvfs);
353 ZFS_VERIFY_ZP(zp);
354
355 /*
356 * Wait for all dirty blocks for this object
357 * to get synced out to disk, and the DMU info
358 * updated.
359 */
360 error = dmu_object_wait_synced(zfsvfs->z_os, zp->z_id);
361 if (error) {
362 ZFS_EXIT(zfsvfs);
363 return (error);
364 }
365
366 /*
367 * Retrieve fill count from DMU object.
368 */
369 error = dmu_object_info(zfsvfs->z_os, zp->z_id, &doi);
370 if (error) {
371 ZFS_EXIT(zfsvfs);
372 return (error);
373 }
374
375 ndata = doi.doi_fill_count;
376
377 ZFS_EXIT(zfsvfs);
378 if (ddi_copyout(&ndata, (void *)data, sizeof (ndata), flag))
379 return (SET_ERROR(EFAULT));
380 return (0);
381 }
382 }
383 return (SET_ERROR(ENOTTY));
384 }
385
386 /*
387 * Utility functions to map and unmap a single physical page. These
388 * are used to manage the mappable copies of ZFS file data, and therefore
389 * do not update ref/mod bits.
390 */
391 caddr_t
392 zfs_map_page(page_t *pp, enum seg_rw rw)
393 {
394 if (kpm_enable)
395 return (hat_kpm_mapin(pp, 0));
396 ASSERT(rw == S_READ || rw == S_WRITE);
397 return (ppmapin(pp, PROT_READ | ((rw == S_WRITE) ? PROT_WRITE : 0),
398 (caddr_t)-1));
399 }
400
401 void
402 zfs_unmap_page(page_t *pp, caddr_t addr)
403 {
404 if (kpm_enable) {
405 hat_kpm_mapout(pp, 0, addr);
406 } else {
407 ppmapout(addr);
408 }
409 }
410
411 /*
412 * When a file is memory mapped, we must keep the IO data synchronized
413 * between the DMU cache and the memory mapped pages. What this means:
414 *
415 * On Write: If we find a memory mapped page, we write to *both*
416 * the page and the dmu buffer.
417 */
418 static void
419 update_pages(vnode_t *vp, int64_t start, int len, objset_t *os, uint64_t oid)
420 {
421 int64_t off;
422
423 off = start & PAGEOFFSET;
424 for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
425 page_t *pp;
426 uint64_t nbytes = MIN(PAGESIZE - off, len);
427
428 if (pp = page_lookup(vp, start, SE_SHARED)) {
429 caddr_t va;
430
431 va = zfs_map_page(pp, S_WRITE);
432 (void) dmu_read(os, oid, start+off, nbytes, va+off,
433 DMU_READ_PREFETCH);
434 zfs_unmap_page(pp, va);
435 page_unlock(pp);
436 }
437 len -= nbytes;
438 off = 0;
439 }
440 }
441
442 /*
443 * When a file is memory mapped, we must keep the IO data synchronized
444 * between the DMU cache and the memory mapped pages. What this means:
445 *
446 * On Read: We "read" preferentially from memory mapped pages,
447 * else we default from the dmu buffer.
448 *
449 * NOTE: We will always "break up" the IO into PAGESIZE uiomoves when
450 * the file is memory mapped.
451 */
452 static int
453 mappedread(vnode_t *vp, int nbytes, uio_t *uio)
454 {
455 znode_t *zp = VTOZ(vp);
456 int64_t start, off;
457 int len = nbytes;
458 int error = 0;
459
460 start = uio->uio_loffset;
461 off = start & PAGEOFFSET;
462 for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
463 page_t *pp;
464 uint64_t bytes = MIN(PAGESIZE - off, len);
465
466 if (pp = page_lookup(vp, start, SE_SHARED)) {
467 caddr_t va;
468
469 va = zfs_map_page(pp, S_READ);
470 error = uiomove(va + off, bytes, UIO_READ, uio);
471 zfs_unmap_page(pp, va);
472 page_unlock(pp);
473 } else {
474 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
475 uio, bytes);
476 }
477 len -= bytes;
478 off = 0;
479 if (error)
480 break;
481 }
482 return (error);
483 }
484
485 offset_t zfs_read_chunk_size = 1024 * 1024; /* Tunable */
486
487 /*
488 * Read bytes from specified file into supplied buffer.
489 *
490 * IN: vp - vnode of file to be read from.
491 * uio - structure supplying read location, range info,
492 * and return buffer.
493 * ioflag - SYNC flags; used to provide FRSYNC semantics.
494 * cr - credentials of caller.
495 * ct - caller context
496 *
497 * OUT: uio - updated offset and range, buffer filled.
498 *
499 * RETURN: 0 on success, error code on failure.
500 *
501 * Side Effects:
502 * vp - atime updated if byte count > 0
503 */
504 /* ARGSUSED */
505 static int
506 zfs_read(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct)
507 {
508 znode_t *zp = VTOZ(vp);
509 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
510 ssize_t n, nbytes;
511 int error = 0;
512 rl_t *rl;
513 xuio_t *xuio = NULL;
514
515 ZFS_ENTER(zfsvfs);
516 ZFS_VERIFY_ZP(zp);
517
518 if (zp->z_pflags & ZFS_AV_QUARANTINED) {
519 ZFS_EXIT(zfsvfs);
520 return (SET_ERROR(EACCES));
521 }
522
523 /*
524 * Validate file offset
525 */
526 if (uio->uio_loffset < (offset_t)0) {
527 ZFS_EXIT(zfsvfs);
528 return (SET_ERROR(EINVAL));
529 }
530
531 /*
532 * Fasttrack empty reads
533 */
534 if (uio->uio_resid == 0) {
535 ZFS_EXIT(zfsvfs);
536 return (0);
537 }
538
539 /*
540 * Check for mandatory locks
541 */
542 if (MANDMODE(zp->z_mode)) {
543 if (error = chklock(vp, FREAD,
544 uio->uio_loffset, uio->uio_resid, uio->uio_fmode, ct)) {
545 ZFS_EXIT(zfsvfs);
546 return (error);
547 }
548 }
549
550 /*
551 * If we're in FRSYNC mode, sync out this znode before reading it.
552 */
553 if (ioflag & FRSYNC || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
554 zil_commit(zfsvfs->z_log, zp->z_id);
555
556 /*
557 * Lock the range against changes.
558 */
559 rl = zfs_range_lock(zp, uio->uio_loffset, uio->uio_resid, RL_READER);
560
561 /*
562 * If we are reading past end-of-file we can skip
563 * to the end; but we might still need to set atime.
564 */
565 if (uio->uio_loffset >= zp->z_size) {
566 error = 0;
567 goto out;
568 }
569
570 ASSERT(uio->uio_loffset < zp->z_size);
571 n = MIN(uio->uio_resid, zp->z_size - uio->uio_loffset);
572
573 if ((uio->uio_extflg == UIO_XUIO) &&
574 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY)) {
575 int nblk;
576 int blksz = zp->z_blksz;
577 uint64_t offset = uio->uio_loffset;
578
579 xuio = (xuio_t *)uio;
580 if ((ISP2(blksz))) {
581 nblk = (P2ROUNDUP(offset + n, blksz) - P2ALIGN(offset,
582 blksz)) / blksz;
583 } else {
584 ASSERT(offset + n <= blksz);
585 nblk = 1;
586 }
587 (void) dmu_xuio_init(xuio, nblk);
588
589 if (vn_has_cached_data(vp)) {
590 /*
591 * For simplicity, we always allocate a full buffer
592 * even if we only expect to read a portion of a block.
593 */
594 while (--nblk >= 0) {
595 (void) dmu_xuio_add(xuio,
596 dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
597 blksz), 0, blksz);
598 }
599 }
600 }
601
602 while (n > 0) {
603 nbytes = MIN(n, zfs_read_chunk_size -
604 P2PHASE(uio->uio_loffset, zfs_read_chunk_size));
605
606 if (vn_has_cached_data(vp)) {
607 error = mappedread(vp, nbytes, uio);
608 } else {
609 error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
610 uio, nbytes);
611 }
612 if (error) {
613 /* convert checksum errors into IO errors */
614 if (error == ECKSUM)
615 error = SET_ERROR(EIO);
616 break;
617 }
618
619 n -= nbytes;
620 }
621 out:
622 zfs_range_unlock(rl);
623
624 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
625 ZFS_EXIT(zfsvfs);
626 return (error);
627 }
628
629 /*
630 * Write the bytes to a file.
631 *
632 * IN: vp - vnode of file to be written to.
633 * uio - structure supplying write location, range info,
634 * and data buffer.
635 * ioflag - FAPPEND, FSYNC, and/or FDSYNC. FAPPEND is
636 * set if in append mode.
637 * cr - credentials of caller.
638 * ct - caller context (NFS/CIFS fem monitor only)
639 *
640 * OUT: uio - updated offset and range.
641 *
642 * RETURN: 0 on success, error code on failure.
643 *
644 * Timestamps:
645 * vp - ctime|mtime updated if byte count > 0
646 */
647
648 /* ARGSUSED */
649 static int
650 zfs_write(vnode_t *vp, uio_t *uio, int ioflag, cred_t *cr, caller_context_t *ct)
651 {
652 znode_t *zp = VTOZ(vp);
653 rlim64_t limit = uio->uio_llimit;
654 ssize_t start_resid = uio->uio_resid;
655 ssize_t tx_bytes;
656 uint64_t end_size;
657 dmu_tx_t *tx;
658 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
659 zilog_t *zilog;
660 offset_t woff;
661 ssize_t n, nbytes;
662 rl_t *rl;
663 int max_blksz = zfsvfs->z_max_blksz;
664 int error = 0;
665 arc_buf_t *abuf;
666 iovec_t *aiov = NULL;
667 xuio_t *xuio = NULL;
668 int i_iov = 0;
669 int iovcnt = uio->uio_iovcnt;
670 iovec_t *iovp = uio->uio_iov;
671 int write_eof;
672 int count = 0;
673 sa_bulk_attr_t bulk[4];
674 uint64_t mtime[2], ctime[2];
675
676 /*
677 * Fasttrack empty write
678 */
679 n = start_resid;
680 if (n == 0)
681 return (0);
682
683 if (limit == RLIM64_INFINITY || limit > MAXOFFSET_T)
684 limit = MAXOFFSET_T;
685
686 ZFS_ENTER(zfsvfs);
687 ZFS_VERIFY_ZP(zp);
688
689 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
690 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
691 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
692 &zp->z_size, 8);
693 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
694 &zp->z_pflags, 8);
695
696 /*
697 * In a case vp->v_vfsp != zp->z_zfsvfs->z_vfs (e.g. snapshots) our
698 * callers might not be able to detect properly that we are read-only,
699 * so check it explicitly here.
700 */
701 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
702 ZFS_EXIT(zfsvfs);
703 return (SET_ERROR(EROFS));
704 }
705
706 /*
707 * If immutable or not appending then return EPERM
708 */
709 if ((zp->z_pflags & (ZFS_IMMUTABLE | ZFS_READONLY)) ||
710 ((zp->z_pflags & ZFS_APPENDONLY) && !(ioflag & FAPPEND) &&
711 (uio->uio_loffset < zp->z_size))) {
712 ZFS_EXIT(zfsvfs);
713 return (SET_ERROR(EPERM));
714 }
715
716 zilog = zfsvfs->z_log;
717
718 /*
719 * Validate file offset
720 */
721 woff = ioflag & FAPPEND ? zp->z_size : uio->uio_loffset;
722 if (woff < 0) {
723 ZFS_EXIT(zfsvfs);
724 return (SET_ERROR(EINVAL));
725 }
726
727 /*
728 * Check for mandatory locks before calling zfs_range_lock()
729 * in order to prevent a deadlock with locks set via fcntl().
730 */
731 if (MANDMODE((mode_t)zp->z_mode) &&
732 (error = chklock(vp, FWRITE, woff, n, uio->uio_fmode, ct)) != 0) {
733 ZFS_EXIT(zfsvfs);
734 return (error);
735 }
736
737 /*
738 * Pre-fault the pages to ensure slow (eg NFS) pages
739 * don't hold up txg.
740 * Skip this if uio contains loaned arc_buf.
741 */
742 if ((uio->uio_extflg == UIO_XUIO) &&
743 (((xuio_t *)uio)->xu_type == UIOTYPE_ZEROCOPY))
744 xuio = (xuio_t *)uio;
745 else
746 uio_prefaultpages(MIN(n, max_blksz), uio);
747
748 /*
749 * If in append mode, set the io offset pointer to eof.
750 */
751 if (ioflag & FAPPEND) {
752 /*
753 * Obtain an appending range lock to guarantee file append
754 * semantics. We reset the write offset once we have the lock.
755 */
756 rl = zfs_range_lock(zp, 0, n, RL_APPEND);
757 woff = rl->r_off;
758 if (rl->r_len == UINT64_MAX) {
759 /*
760 * We overlocked the file because this write will cause
761 * the file block size to increase.
762 * Note that zp_size cannot change with this lock held.
763 */
764 woff = zp->z_size;
765 }
766 uio->uio_loffset = woff;
767 } else {
768 /*
769 * Note that if the file block size will change as a result of
770 * this write, then this range lock will lock the entire file
771 * so that we can re-write the block safely.
772 */
773 rl = zfs_range_lock(zp, woff, n, RL_WRITER);
774 }
775
776 if (woff >= limit) {
777 zfs_range_unlock(rl);
778 ZFS_EXIT(zfsvfs);
779 return (SET_ERROR(EFBIG));
780 }
781
782 if ((woff + n) > limit || woff > (limit - n))
783 n = limit - woff;
784
785 /* Will this write extend the file length? */
786 write_eof = (woff + n > zp->z_size);
787
788 end_size = MAX(zp->z_size, woff + n);
789
790 /*
791 * Write the file in reasonable size chunks. Each chunk is written
792 * in a separate transaction; this keeps the intent log records small
793 * and allows us to do more fine-grained space accounting.
794 */
795 while (n > 0) {
796 abuf = NULL;
797 woff = uio->uio_loffset;
798 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) ||
799 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) {
800 if (abuf != NULL)
801 dmu_return_arcbuf(abuf);
802 error = SET_ERROR(EDQUOT);
803 break;
804 }
805
806 if (xuio && abuf == NULL) {
807 ASSERT(i_iov < iovcnt);
808 aiov = &iovp[i_iov];
809 abuf = dmu_xuio_arcbuf(xuio, i_iov);
810 dmu_xuio_clear(xuio, i_iov);
811 DTRACE_PROBE3(zfs_cp_write, int, i_iov,
812 iovec_t *, aiov, arc_buf_t *, abuf);
813 ASSERT((aiov->iov_base == abuf->b_data) ||
814 ((char *)aiov->iov_base - (char *)abuf->b_data +
815 aiov->iov_len == arc_buf_size(abuf)));
816 i_iov++;
817 } else if (abuf == NULL && n >= max_blksz &&
818 woff >= zp->z_size &&
819 P2PHASE(woff, max_blksz) == 0 &&
820 zp->z_blksz == max_blksz) {
821 /*
822 * This write covers a full block. "Borrow" a buffer
823 * from the dmu so that we can fill it before we enter
824 * a transaction. This avoids the possibility of
825 * holding up the transaction if the data copy hangs
826 * up on a pagefault (e.g., from an NFS server mapping).
827 */
828 size_t cbytes;
829
830 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
831 max_blksz);
832 ASSERT(abuf != NULL);
833 ASSERT(arc_buf_size(abuf) == max_blksz);
834 if (error = uiocopy(abuf->b_data, max_blksz,
835 UIO_WRITE, uio, &cbytes)) {
836 dmu_return_arcbuf(abuf);
837 break;
838 }
839 ASSERT(cbytes == max_blksz);
840 }
841
842 /*
843 * Start a transaction.
844 */
845 tx = dmu_tx_create(zfsvfs->z_os);
846 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
847 dmu_tx_hold_write(tx, zp->z_id, woff, MIN(n, max_blksz));
848 zfs_sa_upgrade_txholds(tx, zp);
849 error = dmu_tx_assign(tx, TXG_WAIT);
850 if (error) {
851 dmu_tx_abort(tx);
852 if (abuf != NULL)
853 dmu_return_arcbuf(abuf);
854 break;
855 }
856
857 /*
858 * If zfs_range_lock() over-locked we grow the blocksize
859 * and then reduce the lock range. This will only happen
860 * on the first iteration since zfs_range_reduce() will
861 * shrink down r_len to the appropriate size.
862 */
863 if (rl->r_len == UINT64_MAX) {
864 uint64_t new_blksz;
865
866 if (zp->z_blksz > max_blksz) {
867 /*
868 * File's blocksize is already larger than the
869 * "recordsize" property. Only let it grow to
870 * the next power of 2.
871 */
872 ASSERT(!ISP2(zp->z_blksz));
873 new_blksz = MIN(end_size,
874 1 << highbit64(zp->z_blksz));
875 } else {
876 new_blksz = MIN(end_size, max_blksz);
877 }
878 zfs_grow_blocksize(zp, new_blksz, tx);
879 zfs_range_reduce(rl, woff, n);
880 }
881
882 /*
883 * XXX - should we really limit each write to z_max_blksz?
884 * Perhaps we should use SPA_MAXBLOCKSIZE chunks?
885 */
886 nbytes = MIN(n, max_blksz - P2PHASE(woff, max_blksz));
887
888 if (abuf == NULL) {
889 tx_bytes = uio->uio_resid;
890 error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
891 uio, nbytes, tx);
892 tx_bytes -= uio->uio_resid;
893 } else {
894 tx_bytes = nbytes;
895 ASSERT(xuio == NULL || tx_bytes == aiov->iov_len);
896 /*
897 * If this is not a full block write, but we are
898 * extending the file past EOF and this data starts
899 * block-aligned, use assign_arcbuf(). Otherwise,
900 * write via dmu_write().
901 */
902 if (tx_bytes < max_blksz && (!write_eof ||
903 aiov->iov_base != abuf->b_data)) {
904 ASSERT(xuio);
905 dmu_write(zfsvfs->z_os, zp->z_id, woff,
906 aiov->iov_len, aiov->iov_base, tx);
907 dmu_return_arcbuf(abuf);
908 xuio_stat_wbuf_copied();
909 } else {
910 ASSERT(xuio || tx_bytes == max_blksz);
911 dmu_assign_arcbuf(sa_get_db(zp->z_sa_hdl),
912 woff, abuf, tx);
913 }
914 ASSERT(tx_bytes <= uio->uio_resid);
915 uioskip(uio, tx_bytes);
916 }
917 if (tx_bytes && vn_has_cached_data(vp)) {
918 update_pages(vp, woff,
919 tx_bytes, zfsvfs->z_os, zp->z_id);
920 }
921
922 /*
923 * If we made no progress, we're done. If we made even
924 * partial progress, update the znode and ZIL accordingly.
925 */
926 if (tx_bytes == 0) {
927 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
928 (void *)&zp->z_size, sizeof (uint64_t), tx);
929 dmu_tx_commit(tx);
930 ASSERT(error != 0);
931 break;
932 }
933
934 /*
935 * Clear Set-UID/Set-GID bits on successful write if not
936 * privileged and at least one of the excute bits is set.
937 *
938 * It would be nice to to this after all writes have
939 * been done, but that would still expose the ISUID/ISGID
940 * to another app after the partial write is committed.
941 *
942 * Note: we don't call zfs_fuid_map_id() here because
943 * user 0 is not an ephemeral uid.
944 */
945 mutex_enter(&zp->z_acl_lock);
946 if ((zp->z_mode & (S_IXUSR | (S_IXUSR >> 3) |
947 (S_IXUSR >> 6))) != 0 &&
948 (zp->z_mode & (S_ISUID | S_ISGID)) != 0 &&
949 secpolicy_vnode_setid_retain(cr,
950 (zp->z_mode & S_ISUID) != 0 && zp->z_uid == 0) != 0) {
951 uint64_t newmode;
952 zp->z_mode &= ~(S_ISUID | S_ISGID);
953 newmode = zp->z_mode;
954 (void) sa_update(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs),
955 (void *)&newmode, sizeof (uint64_t), tx);
956 }
957 mutex_exit(&zp->z_acl_lock);
958
959 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
960 B_TRUE);
961
962 /*
963 * Update the file size (zp_size) if it has changed;
964 * account for possible concurrent updates.
965 */
966 while ((end_size = zp->z_size) < uio->uio_loffset) {
967 (void) atomic_cas_64(&zp->z_size, end_size,
968 uio->uio_loffset);
969 ASSERT(error == 0);
970 }
971 /*
972 * If we are replaying and eof is non zero then force
973 * the file size to the specified eof. Note, there's no
974 * concurrency during replay.
975 */
976 if (zfsvfs->z_replay && zfsvfs->z_replay_eof != 0)
977 zp->z_size = zfsvfs->z_replay_eof;
978
979 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
980
981 zfs_log_write(zilog, tx, TX_WRITE, zp, woff, tx_bytes, ioflag);
982 dmu_tx_commit(tx);
983
984 if (error != 0)
985 break;
986 ASSERT(tx_bytes == nbytes);
987 n -= nbytes;
988
989 if (!xuio && n > 0)
990 uio_prefaultpages(MIN(n, max_blksz), uio);
991 }
992
993 zfs_range_unlock(rl);
994
995 /*
996 * If we're in replay mode, or we made no progress, return error.
997 * Otherwise, it's at least a partial write, so it's successful.
998 */
999 if (zfsvfs->z_replay || uio->uio_resid == start_resid) {
1000 ZFS_EXIT(zfsvfs);
1001 return (error);
1002 }
1003
1004 if (ioflag & (FSYNC | FDSYNC) ||
1005 zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1006 zil_commit(zilog, zp->z_id);
1007
1008 ZFS_EXIT(zfsvfs);
1009 return (0);
1010 }
1011
1012 void
1013 zfs_get_done(zgd_t *zgd, int error)
1014 {
1015 znode_t *zp = zgd->zgd_private;
1016 objset_t *os = zp->z_zfsvfs->z_os;
1017
1018 if (zgd->zgd_db)
1019 dmu_buf_rele(zgd->zgd_db, zgd);
1020
1021 zfs_range_unlock(zgd->zgd_rl);
1022
1023 /*
1024 * Release the vnode asynchronously as we currently have the
1025 * txg stopped from syncing.
1026 */
1027 VN_RELE_ASYNC(ZTOV(zp), dsl_pool_vnrele_taskq(dmu_objset_pool(os)));
1028
1029 if (error == 0 && zgd->zgd_bp)
1030 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp);
1031
1032 kmem_free(zgd, sizeof (zgd_t));
1033 }
1034
1035 #ifdef DEBUG
1036 static int zil_fault_io = 0;
1037 #endif
1038
1039 /*
1040 * Get data to generate a TX_WRITE intent log record.
1041 */
1042 int
1043 zfs_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio)
1044 {
1045 zfsvfs_t *zfsvfs = arg;
1046 objset_t *os = zfsvfs->z_os;
1047 znode_t *zp;
1048 uint64_t object = lr->lr_foid;
1049 uint64_t offset = lr->lr_offset;
1050 uint64_t size = lr->lr_length;
1051 blkptr_t *bp = &lr->lr_blkptr;
1052 dmu_buf_t *db;
1053 zgd_t *zgd;
1054 int error = 0;
1055
1056 ASSERT(zio != NULL);
1057 ASSERT(size != 0);
1058
1059 /*
1060 * Nothing to do if the file has been removed
1061 */
1062 if (zfs_zget(zfsvfs, object, &zp) != 0)
1063 return (SET_ERROR(ENOENT));
1064 if (zp->z_unlinked) {
1065 /*
1066 * Release the vnode asynchronously as we currently have the
1067 * txg stopped from syncing.
1068 */
1069 VN_RELE_ASYNC(ZTOV(zp),
1070 dsl_pool_vnrele_taskq(dmu_objset_pool(os)));
1071 return (SET_ERROR(ENOENT));
1072 }
1073
1074 zgd = (zgd_t *)kmem_zalloc(sizeof (zgd_t), KM_SLEEP);
1075 zgd->zgd_zilog = zfsvfs->z_log;
1076 zgd->zgd_private = zp;
1077
1078 /*
1079 * Write records come in two flavors: immediate and indirect.
1080 * For small writes it's cheaper to store the data with the
1081 * log record (immediate); for large writes it's cheaper to
1082 * sync the data and get a pointer to it (indirect) so that
1083 * we don't have to write the data twice.
1084 */
1085 if (buf != NULL) { /* immediate write */
1086 zgd->zgd_rl = zfs_range_lock(zp, offset, size, RL_READER);
1087 /* test for truncation needs to be done while range locked */
1088 if (offset >= zp->z_size) {
1089 error = SET_ERROR(ENOENT);
1090 } else {
1091 error = dmu_read(os, object, offset, size, buf,
1092 DMU_READ_NO_PREFETCH);
1093 }
1094 ASSERT(error == 0 || error == ENOENT);
1095 } else { /* indirect write */
1096 /*
1097 * Have to lock the whole block to ensure when it's
1098 * written out and it's checksum is being calculated
1099 * that no one can change the data. We need to re-check
1100 * blocksize after we get the lock in case it's changed!
1101 */
1102 for (;;) {
1103 uint64_t blkoff;
1104 size = zp->z_blksz;
1105 blkoff = ISP2(size) ? P2PHASE(offset, size) : offset;
1106 offset -= blkoff;
1107 zgd->zgd_rl = zfs_range_lock(zp, offset, size,
1108 RL_READER);
1109 if (zp->z_blksz == size)
1110 break;
1111 offset += blkoff;
1112 zfs_range_unlock(zgd->zgd_rl);
1113 }
1114 /* test for truncation needs to be done while range locked */
1115 if (lr->lr_offset >= zp->z_size)
1116 error = SET_ERROR(ENOENT);
1117 #ifdef DEBUG
1118 if (zil_fault_io) {
1119 error = SET_ERROR(EIO);
1120 zil_fault_io = 0;
1121 }
1122 #endif
1123 if (error == 0)
1124 error = dmu_buf_hold(os, object, offset, zgd, &db,
1125 DMU_READ_NO_PREFETCH);
1126
1127 if (error == 0) {
1128 blkptr_t *obp = dmu_buf_get_blkptr(db);
1129 if (obp) {
1130 ASSERT(BP_IS_HOLE(bp));
1131 *bp = *obp;
1132 }
1133
1134 zgd->zgd_db = db;
1135 zgd->zgd_bp = bp;
1136
1137 ASSERT(db->db_offset == offset);
1138 ASSERT(db->db_size == size);
1139
1140 error = dmu_sync(zio, lr->lr_common.lrc_txg,
1141 zfs_get_done, zgd);
1142 ASSERT(error || lr->lr_length <= zp->z_blksz);
1143
1144 /*
1145 * On success, we need to wait for the write I/O
1146 * initiated by dmu_sync() to complete before we can
1147 * release this dbuf. We will finish everything up
1148 * in the zfs_get_done() callback.
1149 */
1150 if (error == 0)
1151 return (0);
1152
1153 if (error == EALREADY) {
1154 lr->lr_common.lrc_txtype = TX_WRITE2;
1155 error = 0;
1156 }
1157 }
1158 }
1159
1160 zfs_get_done(zgd, error);
1161
1162 return (error);
1163 }
1164
1165 /*ARGSUSED*/
1166 static int
1167 zfs_access(vnode_t *vp, int mode, int flag, cred_t *cr,
1168 caller_context_t *ct)
1169 {
1170 znode_t *zp = VTOZ(vp);
1171 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1172 int error;
1173
1174 ZFS_ENTER(zfsvfs);
1175 ZFS_VERIFY_ZP(zp);
1176
1177 if (flag & V_ACE_MASK)
1178 error = zfs_zaccess(zp, mode, flag, B_FALSE, cr);
1179 else
1180 error = zfs_zaccess_rwx(zp, mode, flag, cr);
1181
1182 ZFS_EXIT(zfsvfs);
1183 return (error);
1184 }
1185
1186 /*
1187 * If vnode is for a device return a specfs vnode instead.
1188 */
1189 static int
1190 specvp_check(vnode_t **vpp, cred_t *cr)
1191 {
1192 int error = 0;
1193
1194 if (IS_DEVVP(*vpp)) {
1195 struct vnode *svp;
1196
1197 svp = specvp(*vpp, (*vpp)->v_rdev, (*vpp)->v_type, cr);
1198 VN_RELE(*vpp);
1199 if (svp == NULL)
1200 error = SET_ERROR(ENOSYS);
1201 *vpp = svp;
1202 }
1203 return (error);
1204 }
1205
1206
1207 /*
1208 * Lookup an entry in a directory, or an extended attribute directory.
1209 * If it exists, return a held vnode reference for it.
1210 *
1211 * IN: dvp - vnode of directory to search.
1212 * nm - name of entry to lookup.
1213 * pnp - full pathname to lookup [UNUSED].
1214 * flags - LOOKUP_XATTR set if looking for an attribute.
1215 * rdir - root directory vnode [UNUSED].
1216 * cr - credentials of caller.
1217 * ct - caller context
1218 * direntflags - directory lookup flags
1219 * realpnp - returned pathname.
1220 *
1221 * OUT: vpp - vnode of located entry, NULL if not found.
1222 *
1223 * RETURN: 0 on success, error code on failure.
1224 *
1225 * Timestamps:
1226 * NA
1227 */
1228 /* ARGSUSED */
1229 static int
1230 zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct pathname *pnp,
1231 int flags, vnode_t *rdir, cred_t *cr, caller_context_t *ct,
1232 int *direntflags, pathname_t *realpnp)
1233 {
1234 znode_t *zdp = VTOZ(dvp);
1235 zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
1236 int error = 0;
1237
1238 /* fast path */
1239 if (!(flags & (LOOKUP_XATTR | FIGNORECASE))) {
1240
1241 if (dvp->v_type != VDIR) {
1242 return (SET_ERROR(ENOTDIR));
1243 } else if (zdp->z_sa_hdl == NULL) {
1244 return (SET_ERROR(EIO));
1245 }
1246
1247 if (nm[0] == 0 || (nm[0] == '.' && nm[1] == '\0')) {
1248 error = zfs_fastaccesschk_execute(zdp, cr);
1249 if (!error) {
1250 *vpp = dvp;
1251 VN_HOLD(*vpp);
1252 return (0);
1253 }
1254 return (error);
1255 } else {
1256 vnode_t *tvp = dnlc_lookup(dvp, nm);
1257
1258 if (tvp) {
1259 error = zfs_fastaccesschk_execute(zdp, cr);
1260 if (error) {
1261 VN_RELE(tvp);
1262 return (error);
1263 }
1264 if (tvp == DNLC_NO_VNODE) {
1265 VN_RELE(tvp);
1266 return (SET_ERROR(ENOENT));
1267 } else {
1268 *vpp = tvp;
1269 return (specvp_check(vpp, cr));
1270 }
1271 }
1272 }
1273 }
1274
1275 DTRACE_PROBE2(zfs__fastpath__lookup__miss, vnode_t *, dvp, char *, nm);
1276
1277 ZFS_ENTER(zfsvfs);
1278 ZFS_VERIFY_ZP(zdp);
1279
1280 *vpp = NULL;
1281
1282 if (flags & LOOKUP_XATTR) {
1283 /*
1284 * If the xattr property is off, refuse the lookup request.
1285 */
1286 if (!(zfsvfs->z_vfs->vfs_flag & VFS_XATTR)) {
1287 ZFS_EXIT(zfsvfs);
1288 return (SET_ERROR(EINVAL));
1289 }
1290
1291 /*
1292 * We don't allow recursive attributes..
1293 * Maybe someday we will.
1294 */
1295 if (zdp->z_pflags & ZFS_XATTR) {
1296 ZFS_EXIT(zfsvfs);
1297 return (SET_ERROR(EINVAL));
1298 }
1299
1300 if (error = zfs_get_xattrdir(VTOZ(dvp), vpp, cr, flags)) {
1301 ZFS_EXIT(zfsvfs);
1302 return (error);
1303 }
1304
1305 /*
1306 * Do we have permission to get into attribute directory?
1307 */
1308
1309 if (error = zfs_zaccess(VTOZ(*vpp), ACE_EXECUTE, 0,
1310 B_FALSE, cr)) {
1311 VN_RELE(*vpp);
1312 *vpp = NULL;
1313 }
1314
1315 ZFS_EXIT(zfsvfs);
1316 return (error);
1317 }
1318
1319 if (dvp->v_type != VDIR) {
1320 ZFS_EXIT(zfsvfs);
1321 return (SET_ERROR(ENOTDIR));
1322 }
1323
1324 /*
1325 * Check accessibility of directory.
1326 */
1327
1328 if (error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr)) {
1329 ZFS_EXIT(zfsvfs);
1330 return (error);
1331 }
1332
1333 if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
1334 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1335 ZFS_EXIT(zfsvfs);
1336 return (SET_ERROR(EILSEQ));
1337 }
1338
1339 error = zfs_dirlook(zdp, nm, vpp, flags, direntflags, realpnp);
1340 if (error == 0)
1341 error = specvp_check(vpp, cr);
1342
1343 ZFS_EXIT(zfsvfs);
1344 return (error);
1345 }
1346
1347 /*
1348 * Attempt to create a new entry in a directory. If the entry
1349 * already exists, truncate the file if permissible, else return
1350 * an error. Return the vp of the created or trunc'd file.
1351 *
1352 * IN: dvp - vnode of directory to put new file entry in.
1353 * name - name of new file entry.
1354 * vap - attributes of new file.
1355 * excl - flag indicating exclusive or non-exclusive mode.
1356 * mode - mode to open file with.
1357 * cr - credentials of caller.
1358 * flag - large file flag [UNUSED].
1359 * ct - caller context
1360 * vsecp - ACL to be set
1361 *
1362 * OUT: vpp - vnode of created or trunc'd entry.
1363 *
1364 * RETURN: 0 on success, error code on failure.
1365 *
1366 * Timestamps:
1367 * dvp - ctime|mtime updated if new entry created
1368 * vp - ctime|mtime always, atime if new
1369 */
1370
1371 /* ARGSUSED */
1372 static int
1373 zfs_create(vnode_t *dvp, char *name, vattr_t *vap, vcexcl_t excl,
1374 int mode, vnode_t **vpp, cred_t *cr, int flag, caller_context_t *ct,
1375 vsecattr_t *vsecp)
1376 {
1377 znode_t *zp, *dzp = VTOZ(dvp);
1378 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1379 zilog_t *zilog;
1380 objset_t *os;
1381 zfs_dirlock_t *dl;
1382 dmu_tx_t *tx;
1383 int error;
1384 ksid_t *ksid;
1385 uid_t uid;
1386 gid_t gid = crgetgid(cr);
1387 zfs_acl_ids_t acl_ids;
1388 boolean_t fuid_dirtied;
1389 boolean_t have_acl = B_FALSE;
1390 boolean_t waited = B_FALSE;
1391
1392 /*
1393 * If we have an ephemeral id, ACL, or XVATTR then
1394 * make sure file system is at proper version
1395 */
1396
1397 ksid = crgetsid(cr, KSID_OWNER);
1398 if (ksid)
1399 uid = ksid_getid(ksid);
1400 else
1401 uid = crgetuid(cr);
1402
1403 if (zfsvfs->z_use_fuids == B_FALSE &&
1404 (vsecp || (vap->va_mask & AT_XVATTR) ||
1405 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1406 return (SET_ERROR(EINVAL));
1407
1408 ZFS_ENTER(zfsvfs);
1409 ZFS_VERIFY_ZP(dzp);
1410 os = zfsvfs->z_os;
1411 zilog = zfsvfs->z_log;
1412
1413 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
1414 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1415 ZFS_EXIT(zfsvfs);
1416 return (SET_ERROR(EILSEQ));
1417 }
1418
1419 if (vap->va_mask & AT_XVATTR) {
1420 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1421 crgetuid(cr), cr, vap->va_type)) != 0) {
1422 ZFS_EXIT(zfsvfs);
1423 return (error);
1424 }
1425 }
1426 top:
1427 *vpp = NULL;
1428
1429 if ((vap->va_mode & VSVTX) && secpolicy_vnode_stky_modify(cr))
1430 vap->va_mode &= ~VSVTX;
1431
1432 if (*name == '\0') {
1433 /*
1434 * Null component name refers to the directory itself.
1435 */
1436 VN_HOLD(dvp);
1437 zp = dzp;
1438 dl = NULL;
1439 error = 0;
1440 } else {
1441 /* possible VN_HOLD(zp) */
1442 int zflg = 0;
1443
1444 if (flag & FIGNORECASE)
1445 zflg |= ZCILOOK;
1446
1447 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1448 NULL, NULL);
1449 if (error) {
1450 if (have_acl)
1451 zfs_acl_ids_free(&acl_ids);
1452 if (strcmp(name, "..") == 0)
1453 error = SET_ERROR(EISDIR);
1454 ZFS_EXIT(zfsvfs);
1455 return (error);
1456 }
1457 }
1458
1459 if (zp == NULL) {
1460 uint64_t txtype;
1461
1462 /*
1463 * Create a new file object and update the directory
1464 * to reference it.
1465 */
1466 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) {
1467 if (have_acl)
1468 zfs_acl_ids_free(&acl_ids);
1469 goto out;
1470 }
1471
1472 /*
1473 * We only support the creation of regular files in
1474 * extended attribute directories.
1475 */
1476
1477 if ((dzp->z_pflags & ZFS_XATTR) &&
1478 (vap->va_type != VREG)) {
1479 if (have_acl)
1480 zfs_acl_ids_free(&acl_ids);
1481 error = SET_ERROR(EINVAL);
1482 goto out;
1483 }
1484
1485 if (!have_acl && (error = zfs_acl_ids_create(dzp, 0, vap,
1486 cr, vsecp, &acl_ids)) != 0)
1487 goto out;
1488 have_acl = B_TRUE;
1489
1490 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
1491 zfs_acl_ids_free(&acl_ids);
1492 error = SET_ERROR(EDQUOT);
1493 goto out;
1494 }
1495
1496 tx = dmu_tx_create(os);
1497
1498 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1499 ZFS_SA_BASE_ATTR_SIZE);
1500
1501 fuid_dirtied = zfsvfs->z_fuid_dirty;
1502 if (fuid_dirtied)
1503 zfs_fuid_txhold(zfsvfs, tx);
1504 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
1505 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
1506 if (!zfsvfs->z_use_sa &&
1507 acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1508 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
1509 0, acl_ids.z_aclp->z_acl_bytes);
1510 }
1511 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1512 if (error) {
1513 zfs_dirent_unlock(dl);
1514 if (error == ERESTART) {
1515 waited = B_TRUE;
1516 dmu_tx_wait(tx);
1517 dmu_tx_abort(tx);
1518 goto top;
1519 }
1520 zfs_acl_ids_free(&acl_ids);
1521 dmu_tx_abort(tx);
1522 ZFS_EXIT(zfsvfs);
1523 return (error);
1524 }
1525 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
1526
1527 if (fuid_dirtied)
1528 zfs_fuid_sync(zfsvfs, tx);
1529
1530 (void) zfs_link_create(dl, zp, tx, ZNEW);
1531 txtype = zfs_log_create_txtype(Z_FILE, vsecp, vap);
1532 if (flag & FIGNORECASE)
1533 txtype |= TX_CI;
1534 zfs_log_create(zilog, tx, txtype, dzp, zp, name,
1535 vsecp, acl_ids.z_fuidp, vap);
1536 zfs_acl_ids_free(&acl_ids);
1537 dmu_tx_commit(tx);
1538 } else {
1539 int aflags = (flag & FAPPEND) ? V_APPEND : 0;
1540
1541 if (have_acl)
1542 zfs_acl_ids_free(&acl_ids);
1543 have_acl = B_FALSE;
1544
1545 /*
1546 * A directory entry already exists for this name.
1547 */
1548 /*
1549 * Can't truncate an existing file if in exclusive mode.
1550 */
1551 if (excl == EXCL) {
1552 error = SET_ERROR(EEXIST);
1553 goto out;
1554 }
1555 /*
1556 * Can't open a directory for writing.
1557 */
1558 if ((ZTOV(zp)->v_type == VDIR) && (mode & S_IWRITE)) {
1559 error = SET_ERROR(EISDIR);
1560 goto out;
1561 }
1562 /*
1563 * Verify requested access to file.
1564 */
1565 if (mode && (error = zfs_zaccess_rwx(zp, mode, aflags, cr))) {
1566 goto out;
1567 }
1568
1569 mutex_enter(&dzp->z_lock);
1570 dzp->z_seq++;
1571 mutex_exit(&dzp->z_lock);
1572
1573 /*
1574 * Truncate regular files if requested.
1575 */
1576 if ((ZTOV(zp)->v_type == VREG) &&
1577 (vap->va_mask & AT_SIZE) && (vap->va_size == 0)) {
1578 /* we can't hold any locks when calling zfs_freesp() */
1579 zfs_dirent_unlock(dl);
1580 dl = NULL;
1581 error = zfs_freesp(zp, 0, 0, mode, TRUE);
1582 if (error == 0) {
1583 vnevent_create(ZTOV(zp), ct);
1584 }
1585 }
1586 }
1587 out:
1588
1589 if (dl)
1590 zfs_dirent_unlock(dl);
1591
1592 if (error) {
1593 if (zp)
1594 VN_RELE(ZTOV(zp));
1595 } else {
1596 *vpp = ZTOV(zp);
1597 error = specvp_check(vpp, cr);
1598 }
1599
1600 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1601 zil_commit(zilog, 0);
1602
1603 ZFS_EXIT(zfsvfs);
1604 return (error);
1605 }
1606
1607 /*
1608 * Remove an entry from a directory.
1609 *
1610 * IN: dvp - vnode of directory to remove entry from.
1611 * name - name of entry to remove.
1612 * cr - credentials of caller.
1613 * ct - caller context
1614 * flags - case flags
1615 *
1616 * RETURN: 0 on success, error code on failure.
1617 *
1618 * Timestamps:
1619 * dvp - ctime|mtime
1620 * vp - ctime (if nlink > 0)
1621 */
1622
1623 uint64_t null_xattr = 0;
1624
1625 /*ARGSUSED*/
1626 static int
1627 zfs_remove(vnode_t *dvp, char *name, cred_t *cr, caller_context_t *ct,
1628 int flags)
1629 {
1630 znode_t *zp, *dzp = VTOZ(dvp);
1631 znode_t *xzp;
1632 vnode_t *vp;
1633 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1634 zilog_t *zilog;
1635 uint64_t acl_obj, xattr_obj;
1636 uint64_t xattr_obj_unlinked = 0;
1637 uint64_t obj = 0;
1638 zfs_dirlock_t *dl;
1639 dmu_tx_t *tx;
1640 boolean_t may_delete_now, delete_now = FALSE;
1641 boolean_t unlinked, toobig = FALSE;
1642 uint64_t txtype;
1643 pathname_t *realnmp = NULL;
1644 pathname_t realnm;
1645 int error;
1646 int zflg = ZEXISTS;
1647 boolean_t waited = B_FALSE;
1648
1649 ZFS_ENTER(zfsvfs);
1650 ZFS_VERIFY_ZP(dzp);
1651 zilog = zfsvfs->z_log;
1652
1653 if (flags & FIGNORECASE) {
1654 zflg |= ZCILOOK;
1655 pn_alloc(&realnm);
1656 realnmp = &realnm;
1657 }
1658
1659 top:
1660 xattr_obj = 0;
1661 xzp = NULL;
1662 /*
1663 * Attempt to lock directory; fail if entry doesn't exist.
1664 */
1665 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
1666 NULL, realnmp)) {
1667 if (realnmp)
1668 pn_free(realnmp);
1669 ZFS_EXIT(zfsvfs);
1670 return (error);
1671 }
1672
1673 vp = ZTOV(zp);
1674
1675 if (error = zfs_zaccess_delete(dzp, zp, cr)) {
1676 goto out;
1677 }
1678
1679 /*
1680 * Need to use rmdir for removing directories.
1681 */
1682 if (vp->v_type == VDIR) {
1683 error = SET_ERROR(EPERM);
1684 goto out;
1685 }
1686
1687 vnevent_remove(vp, dvp, name, ct);
1688
1689 if (realnmp)
1690 dnlc_remove(dvp, realnmp->pn_buf);
1691 else
1692 dnlc_remove(dvp, name);
1693
1694 mutex_enter(&vp->v_lock);
1695 may_delete_now = vp->v_count == 1 && !vn_has_cached_data(vp);
1696 mutex_exit(&vp->v_lock);
1697
1698 /*
1699 * We may delete the znode now, or we may put it in the unlinked set;
1700 * it depends on whether we're the last link, and on whether there are
1701 * other holds on the vnode. So we dmu_tx_hold() the right things to
1702 * allow for either case.
1703 */
1704 obj = zp->z_id;
1705 tx = dmu_tx_create(zfsvfs->z_os);
1706 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
1707 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
1708 zfs_sa_upgrade_txholds(tx, zp);
1709 zfs_sa_upgrade_txholds(tx, dzp);
1710 if (may_delete_now) {
1711 toobig =
1712 zp->z_size > zp->z_blksz * DMU_MAX_DELETEBLKCNT;
1713 /* if the file is too big, only hold_free a token amount */
1714 dmu_tx_hold_free(tx, zp->z_id, 0,
1715 (toobig ? DMU_MAX_ACCESS : DMU_OBJECT_END));
1716 }
1717
1718 /* are there any extended attributes? */
1719 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1720 &xattr_obj, sizeof (xattr_obj));
1721 if (error == 0 && xattr_obj) {
1722 error = zfs_zget(zfsvfs, xattr_obj, &xzp);
1723 ASSERT0(error);
1724 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1725 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
1726 }
1727
1728 mutex_enter(&zp->z_lock);
1729 if ((acl_obj = zfs_external_acl(zp)) != 0 && may_delete_now)
1730 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
1731 mutex_exit(&zp->z_lock);
1732
1733 /* charge as an update -- would be nice not to charge at all */
1734 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
1735
1736 /*
1737 * Mark this transaction as typically resulting in a net free of
1738 * space, unless object removal will be delayed indefinitely
1739 * (due to active holds on the vnode due to the file being open).
1740 */
1741 if (may_delete_now)
1742 dmu_tx_mark_netfree(tx);
1743
1744 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1745 if (error) {
1746 zfs_dirent_unlock(dl);
1747 VN_RELE(vp);
1748 if (xzp)
1749 VN_RELE(ZTOV(xzp));
1750 if (error == ERESTART) {
1751 waited = B_TRUE;
1752 dmu_tx_wait(tx);
1753 dmu_tx_abort(tx);
1754 goto top;
1755 }
1756 if (realnmp)
1757 pn_free(realnmp);
1758 dmu_tx_abort(tx);
1759 ZFS_EXIT(zfsvfs);
1760 return (error);
1761 }
1762
1763 /*
1764 * Remove the directory entry.
1765 */
1766 error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
1767
1768 if (error) {
1769 dmu_tx_commit(tx);
1770 goto out;
1771 }
1772
1773 if (unlinked) {
1774 /*
1775 * Hold z_lock so that we can make sure that the ACL obj
1776 * hasn't changed. Could have been deleted due to
1777 * zfs_sa_upgrade().
1778 */
1779 mutex_enter(&zp->z_lock);
1780 mutex_enter(&vp->v_lock);
1781 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
1782 &xattr_obj_unlinked, sizeof (xattr_obj_unlinked));
1783 delete_now = may_delete_now && !toobig &&
1784 vp->v_count == 1 && !vn_has_cached_data(vp) &&
1785 xattr_obj == xattr_obj_unlinked && zfs_external_acl(zp) ==
1786 acl_obj;
1787 mutex_exit(&vp->v_lock);
1788 }
1789
1790 if (delete_now) {
1791 if (xattr_obj_unlinked) {
1792 ASSERT3U(xzp->z_links, ==, 2);
1793 mutex_enter(&xzp->z_lock);
1794 xzp->z_unlinked = 1;
1795 xzp->z_links = 0;
1796 error = sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
1797 &xzp->z_links, sizeof (xzp->z_links), tx);
1798 ASSERT3U(error, ==, 0);
1799 mutex_exit(&xzp->z_lock);
1800 zfs_unlinked_add(xzp, tx);
1801
1802 if (zp->z_is_sa)
1803 error = sa_remove(zp->z_sa_hdl,
1804 SA_ZPL_XATTR(zfsvfs), tx);
1805 else
1806 error = sa_update(zp->z_sa_hdl,
1807 SA_ZPL_XATTR(zfsvfs), &null_xattr,
1808 sizeof (uint64_t), tx);
1809 ASSERT0(error);
1810 }
1811 mutex_enter(&vp->v_lock);
1812 vp->v_count--;
1813 ASSERT0(vp->v_count);
1814 mutex_exit(&vp->v_lock);
1815 mutex_exit(&zp->z_lock);
1816 zfs_znode_delete(zp, tx);
1817 } else if (unlinked) {
1818 mutex_exit(&zp->z_lock);
1819 zfs_unlinked_add(zp, tx);
1820 }
1821
1822 txtype = TX_REMOVE;
1823 if (flags & FIGNORECASE)
1824 txtype |= TX_CI;
1825 zfs_log_remove(zilog, tx, txtype, dzp, name, obj);
1826
1827 dmu_tx_commit(tx);
1828 out:
1829 if (realnmp)
1830 pn_free(realnmp);
1831
1832 zfs_dirent_unlock(dl);
1833
1834 if (!delete_now)
1835 VN_RELE(vp);
1836 if (xzp)
1837 VN_RELE(ZTOV(xzp));
1838
1839 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
1840 zil_commit(zilog, 0);
1841
1842 ZFS_EXIT(zfsvfs);
1843 return (error);
1844 }
1845
1846 /*
1847 * Create a new directory and insert it into dvp using the name
1848 * provided. Return a pointer to the inserted directory.
1849 *
1850 * IN: dvp - vnode of directory to add subdir to.
1851 * dirname - name of new directory.
1852 * vap - attributes of new directory.
1853 * cr - credentials of caller.
1854 * ct - caller context
1855 * flags - case flags
1856 * vsecp - ACL to be set
1857 *
1858 * OUT: vpp - vnode of created directory.
1859 *
1860 * RETURN: 0 on success, error code on failure.
1861 *
1862 * Timestamps:
1863 * dvp - ctime|mtime updated
1864 * vp - ctime|mtime|atime updated
1865 */
1866 /*ARGSUSED*/
1867 static int
1868 zfs_mkdir(vnode_t *dvp, char *dirname, vattr_t *vap, vnode_t **vpp, cred_t *cr,
1869 caller_context_t *ct, int flags, vsecattr_t *vsecp)
1870 {
1871 znode_t *zp, *dzp = VTOZ(dvp);
1872 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1873 zilog_t *zilog;
1874 zfs_dirlock_t *dl;
1875 uint64_t txtype;
1876 dmu_tx_t *tx;
1877 int error;
1878 int zf = ZNEW;
1879 ksid_t *ksid;
1880 uid_t uid;
1881 gid_t gid = crgetgid(cr);
1882 zfs_acl_ids_t acl_ids;
1883 boolean_t fuid_dirtied;
1884 boolean_t waited = B_FALSE;
1885
1886 ASSERT(vap->va_type == VDIR);
1887
1888 /*
1889 * If we have an ephemeral id, ACL, or XVATTR then
1890 * make sure file system is at proper version
1891 */
1892
1893 ksid = crgetsid(cr, KSID_OWNER);
1894 if (ksid)
1895 uid = ksid_getid(ksid);
1896 else
1897 uid = crgetuid(cr);
1898 if (zfsvfs->z_use_fuids == B_FALSE &&
1899 (vsecp || (vap->va_mask & AT_XVATTR) ||
1900 IS_EPHEMERAL(uid) || IS_EPHEMERAL(gid)))
1901 return (SET_ERROR(EINVAL));
1902
1903 ZFS_ENTER(zfsvfs);
1904 ZFS_VERIFY_ZP(dzp);
1905 zilog = zfsvfs->z_log;
1906
1907 if (dzp->z_pflags & ZFS_XATTR) {
1908 ZFS_EXIT(zfsvfs);
1909 return (SET_ERROR(EINVAL));
1910 }
1911
1912 if (zfsvfs->z_utf8 && u8_validate(dirname,
1913 strlen(dirname), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
1914 ZFS_EXIT(zfsvfs);
1915 return (SET_ERROR(EILSEQ));
1916 }
1917 if (flags & FIGNORECASE)
1918 zf |= ZCILOOK;
1919
1920 if (vap->va_mask & AT_XVATTR) {
1921 if ((error = secpolicy_xvattr((xvattr_t *)vap,
1922 crgetuid(cr), cr, vap->va_type)) != 0) {
1923 ZFS_EXIT(zfsvfs);
1924 return (error);
1925 }
1926 }
1927
1928 if ((error = zfs_acl_ids_create(dzp, 0, vap, cr,
1929 vsecp, &acl_ids)) != 0) {
1930 ZFS_EXIT(zfsvfs);
1931 return (error);
1932 }
1933 /*
1934 * First make sure the new directory doesn't exist.
1935 *
1936 * Existence is checked first to make sure we don't return
1937 * EACCES instead of EEXIST which can cause some applications
1938 * to fail.
1939 */
1940 top:
1941 *vpp = NULL;
1942
1943 if (error = zfs_dirent_lock(&dl, dzp, dirname, &zp, zf,
1944 NULL, NULL)) {
1945 zfs_acl_ids_free(&acl_ids);
1946 ZFS_EXIT(zfsvfs);
1947 return (error);
1948 }
1949
1950 if (error = zfs_zaccess(dzp, ACE_ADD_SUBDIRECTORY, 0, B_FALSE, cr)) {
1951 zfs_acl_ids_free(&acl_ids);
1952 zfs_dirent_unlock(dl);
1953 ZFS_EXIT(zfsvfs);
1954 return (error);
1955 }
1956
1957 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
1958 zfs_acl_ids_free(&acl_ids);
1959 zfs_dirent_unlock(dl);
1960 ZFS_EXIT(zfsvfs);
1961 return (SET_ERROR(EDQUOT));
1962 }
1963
1964 /*
1965 * Add a new entry to the directory.
1966 */
1967 tx = dmu_tx_create(zfsvfs->z_os);
1968 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, dirname);
1969 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
1970 fuid_dirtied = zfsvfs->z_fuid_dirty;
1971 if (fuid_dirtied)
1972 zfs_fuid_txhold(zfsvfs, tx);
1973 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1974 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
1975 acl_ids.z_aclp->z_acl_bytes);
1976 }
1977
1978 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1979 ZFS_SA_BASE_ATTR_SIZE);
1980
1981 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
1982 if (error) {
1983 zfs_dirent_unlock(dl);
1984 if (error == ERESTART) {
1985 waited = B_TRUE;
1986 dmu_tx_wait(tx);
1987 dmu_tx_abort(tx);
1988 goto top;
1989 }
1990 zfs_acl_ids_free(&acl_ids);
1991 dmu_tx_abort(tx);
1992 ZFS_EXIT(zfsvfs);
1993 return (error);
1994 }
1995
1996 /*
1997 * Create new node.
1998 */
1999 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
2000
2001 if (fuid_dirtied)
2002 zfs_fuid_sync(zfsvfs, tx);
2003
2004 /*
2005 * Now put new name in parent dir.
2006 */
2007 (void) zfs_link_create(dl, zp, tx, ZNEW);
2008
2009 *vpp = ZTOV(zp);
2010
2011 txtype = zfs_log_create_txtype(Z_DIR, vsecp, vap);
2012 if (flags & FIGNORECASE)
2013 txtype |= TX_CI;
2014 zfs_log_create(zilog, tx, txtype, dzp, zp, dirname, vsecp,
2015 acl_ids.z_fuidp, vap);
2016
2017 zfs_acl_ids_free(&acl_ids);
2018
2019 dmu_tx_commit(tx);
2020
2021 zfs_dirent_unlock(dl);
2022
2023 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
2024 zil_commit(zilog, 0);
2025
2026 ZFS_EXIT(zfsvfs);
2027 return (0);
2028 }
2029
2030 /*
2031 * Remove a directory subdir entry. If the current working
2032 * directory is the same as the subdir to be removed, the
2033 * remove will fail.
2034 *
2035 * IN: dvp - vnode of directory to remove from.
2036 * name - name of directory to be removed.
2037 * cwd - vnode of current working directory.
2038 * cr - credentials of caller.
2039 * ct - caller context
2040 * flags - case flags
2041 *
2042 * RETURN: 0 on success, error code on failure.
2043 *
2044 * Timestamps:
2045 * dvp - ctime|mtime updated
2046 */
2047 /*ARGSUSED*/
2048 static int
2049 zfs_rmdir(vnode_t *dvp, char *name, vnode_t *cwd, cred_t *cr,
2050 caller_context_t *ct, int flags)
2051 {
2052 znode_t *dzp = VTOZ(dvp);
2053 znode_t *zp;
2054 vnode_t *vp;
2055 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
2056 zilog_t *zilog;
2057 zfs_dirlock_t *dl;
2058 dmu_tx_t *tx;
2059 int error;
2060 int zflg = ZEXISTS;
2061 boolean_t waited = B_FALSE;
2062
2063 ZFS_ENTER(zfsvfs);
2064 ZFS_VERIFY_ZP(dzp);
2065 zilog = zfsvfs->z_log;
2066
2067 if (flags & FIGNORECASE)
2068 zflg |= ZCILOOK;
2069 top:
2070 zp = NULL;
2071
2072 /*
2073 * Attempt to lock directory; fail if entry doesn't exist.
2074 */
2075 if (error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg,
2076 NULL, NULL)) {
2077 ZFS_EXIT(zfsvfs);
2078 return (error);
2079 }
2080
2081 vp = ZTOV(zp);
2082
2083 if (error = zfs_zaccess_delete(dzp, zp, cr)) {
2084 goto out;
2085 }
2086
2087 if (vp->v_type != VDIR) {
2088 error = SET_ERROR(ENOTDIR);
2089 goto out;
2090 }
2091
2092 if (vp == cwd) {
2093 error = SET_ERROR(EINVAL);
2094 goto out;
2095 }
2096
2097 vnevent_rmdir(vp, dvp, name, ct);
2098
2099 /*
2100 * Grab a lock on the directory to make sure that noone is
2101 * trying to add (or lookup) entries while we are removing it.
2102 */
2103 rw_enter(&zp->z_name_lock, RW_WRITER);
2104
2105 /*
2106 * Grab a lock on the parent pointer to make sure we play well
2107 * with the treewalk and directory rename code.
2108 */
2109 rw_enter(&zp->z_parent_lock, RW_WRITER);
2110
2111 tx = dmu_tx_create(zfsvfs->z_os);
2112 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, name);
2113 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
2114 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
2115 zfs_sa_upgrade_txholds(tx, zp);
2116 zfs_sa_upgrade_txholds(tx, dzp);
2117 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
2118 if (error) {
2119 rw_exit(&zp->z_parent_lock);
2120 rw_exit(&zp->z_name_lock);
2121 zfs_dirent_unlock(dl);
2122 VN_RELE(vp);
2123 if (error == ERESTART) {
2124 waited = B_TRUE;
2125 dmu_tx_wait(tx);
2126 dmu_tx_abort(tx);
2127 goto top;
2128 }
2129 dmu_tx_abort(tx);
2130 ZFS_EXIT(zfsvfs);
2131 return (error);
2132 }
2133
2134 error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
2135
2136 if (error == 0) {
2137 uint64_t txtype = TX_RMDIR;
2138 if (flags & FIGNORECASE)
2139 txtype |= TX_CI;
2140 zfs_log_remove(zilog, tx, txtype, dzp, name, ZFS_NO_OBJECT);
2141 }
2142
2143 dmu_tx_commit(tx);
2144
2145 rw_exit(&zp->z_parent_lock);
2146 rw_exit(&zp->z_name_lock);
2147 out:
2148 zfs_dirent_unlock(dl);
2149
2150 VN_RELE(vp);
2151
2152 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
2153 zil_commit(zilog, 0);
2154
2155 ZFS_EXIT(zfsvfs);
2156 return (error);
2157 }
2158
2159 /*
2160 * Read as many directory entries as will fit into the provided
2161 * buffer from the given directory cursor position (specified in
2162 * the uio structure).
2163 *
2164 * IN: vp - vnode of directory to read.
2165 * uio - structure supplying read location, range info,
2166 * and return buffer.
2167 * cr - credentials of caller.
2168 * ct - caller context
2169 * flags - case flags
2170 *
2171 * OUT: uio - updated offset and range, buffer filled.
2172 * eofp - set to true if end-of-file detected.
2173 *
2174 * RETURN: 0 on success, error code on failure.
2175 *
2176 * Timestamps:
2177 * vp - atime updated
2178 *
2179 * Note that the low 4 bits of the cookie returned by zap is always zero.
2180 * This allows us to use the low range for "special" directory entries:
2181 * We use 0 for '.', and 1 for '..'. If this is the root of the filesystem,
2182 * we use the offset 2 for the '.zfs' directory.
2183 */
2184 /* ARGSUSED */
2185 static int
2186 zfs_readdir(vnode_t *vp, uio_t *uio, cred_t *cr, int *eofp,
2187 caller_context_t *ct, int flags)
2188 {
2189 znode_t *zp = VTOZ(vp);
2190 iovec_t *iovp;
2191 edirent_t *eodp;
2192 dirent64_t *odp;
2193 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2194 objset_t *os;
2195 caddr_t outbuf;
2196 size_t bufsize;
2197 zap_cursor_t zc;
2198 zap_attribute_t zap;
2199 uint_t bytes_wanted;
2200 uint64_t offset; /* must be unsigned; checks for < 1 */
2201 uint64_t parent;
2202 int local_eof;
2203 int outcount;
2204 int error;
2205 uint8_t prefetch;
2206 boolean_t check_sysattrs;
2207
2208 ZFS_ENTER(zfsvfs);
2209 ZFS_VERIFY_ZP(zp);
2210
2211 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
2212 &parent, sizeof (parent))) != 0) {
2213 ZFS_EXIT(zfsvfs);
2214 return (error);
2215 }
2216
2217 /*
2218 * If we are not given an eof variable,
2219 * use a local one.
2220 */
2221 if (eofp == NULL)
2222 eofp = &local_eof;
2223
2224 /*
2225 * Check for valid iov_len.
2226 */
2227 if (uio->uio_iov->iov_len <= 0) {
2228 ZFS_EXIT(zfsvfs);
2229 return (SET_ERROR(EINVAL));
2230 }
2231
2232 /*
2233 * Quit if directory has been removed (posix)
2234 */
2235 if ((*eofp = zp->z_unlinked) != 0) {
2236 ZFS_EXIT(zfsvfs);
2237 return (0);
2238 }
2239
2240 error = 0;
2241 os = zfsvfs->z_os;
2242 offset = uio->uio_loffset;
2243 prefetch = zp->z_zn_prefetch;
2244
2245 /*
2246 * Initialize the iterator cursor.
2247 */
2248 if (offset <= 3) {
2249 /*
2250 * Start iteration from the beginning of the directory.
2251 */
2252 zap_cursor_init(&zc, os, zp->z_id);
2253 } else {
2254 /*
2255 * The offset is a serialized cursor.
2256 */
2257 zap_cursor_init_serialized(&zc, os, zp->z_id, offset);
2258 }
2259
2260 /*
2261 * Get space to change directory entries into fs independent format.
2262 */
2263 iovp = uio->uio_iov;
2264 bytes_wanted = iovp->iov_len;
2265 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1) {
2266 bufsize = bytes_wanted;
2267 outbuf = kmem_alloc(bufsize, KM_SLEEP);
2268 odp = (struct dirent64 *)outbuf;
2269 } else {
2270 bufsize = bytes_wanted;
2271 outbuf = NULL;
2272 odp = (struct dirent64 *)iovp->iov_base;
2273 }
2274 eodp = (struct edirent *)odp;
2275
2276 /*
2277 * If this VFS supports the system attribute view interface; and
2278 * we're looking at an extended attribute directory; and we care
2279 * about normalization conflicts on this vfs; then we must check
2280 * for normalization conflicts with the sysattr name space.
2281 */
2282 check_sysattrs = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
2283 (vp->v_flag & V_XATTRDIR) && zfsvfs->z_norm &&
2284 (flags & V_RDDIR_ENTFLAGS);
2285
2286 /*
2287 * Transform to file-system independent format
2288 */
2289 outcount = 0;
2290 while (outcount < bytes_wanted) {
2291 ino64_t objnum;
2292 ushort_t reclen;
2293 off64_t *next = NULL;
2294
2295 /*
2296 * Special case `.', `..', and `.zfs'.
2297 */
2298 if (offset == 0) {
2299 (void) strcpy(zap.za_name, ".");
2300 zap.za_normalization_conflict = 0;
2301 objnum = zp->z_id;
2302 } else if (offset == 1) {
2303 (void) strcpy(zap.za_name, "..");
2304 zap.za_normalization_conflict = 0;
2305 objnum = parent;
2306 } else if (offset == 2 && zfs_show_ctldir(zp)) {
2307 (void) strcpy(zap.za_name, ZFS_CTLDIR_NAME);
2308 zap.za_normalization_conflict = 0;
2309 objnum = ZFSCTL_INO_ROOT;
2310 } else {
2311 /*
2312 * Grab next entry.
2313 */
2314 if (error = zap_cursor_retrieve(&zc, &zap)) {
2315 if ((*eofp = (error == ENOENT)) != 0)
2316 break;
2317 else
2318 goto update;
2319 }
2320
2321 if (zap.za_integer_length != 8 ||
2322 zap.za_num_integers != 1) {
2323 cmn_err(CE_WARN, "zap_readdir: bad directory "
2324 "entry, obj = %lld, offset = %lld\n",
2325 (u_longlong_t)zp->z_id,
2326 (u_longlong_t)offset);
2327 error = SET_ERROR(ENXIO);
2328 goto update;
2329 }
2330
2331 objnum = ZFS_DIRENT_OBJ(zap.za_first_integer);
2332 /*
2333 * MacOS X can extract the object type here such as:
2334 * uint8_t type = ZFS_DIRENT_TYPE(zap.za_first_integer);
2335 */
2336
2337 if (check_sysattrs && !zap.za_normalization_conflict) {
2338 zap.za_normalization_conflict =
2339 xattr_sysattr_casechk(zap.za_name);
2340 }
2341 }
2342
2343 if (flags & V_RDDIR_ACCFILTER) {
2344 /*
2345 * If we have no access at all, don't include
2346 * this entry in the returned information
2347 */
2348 znode_t *ezp;
2349 if (zfs_zget(zp->z_zfsvfs, objnum, &ezp) != 0)
2350 goto skip_entry;
2351 if (!zfs_has_access(ezp, cr)) {
2352 VN_RELE(ZTOV(ezp));
2353 goto skip_entry;
2354 }
2355 VN_RELE(ZTOV(ezp));
2356 }
2357
2358 if (flags & V_RDDIR_ENTFLAGS)
2359 reclen = EDIRENT_RECLEN(strlen(zap.za_name));
2360 else
2361 reclen = DIRENT64_RECLEN(strlen(zap.za_name));
2362
2363 /*
2364 * Will this entry fit in the buffer?
2365 */
2366 if (outcount + reclen > bufsize) {
2367 /*
2368 * Did we manage to fit anything in the buffer?
2369 */
2370 if (!outcount) {
2371 error = SET_ERROR(EINVAL);
2372 goto update;
2373 }
2374 break;
2375 }
2376 if (flags & V_RDDIR_ENTFLAGS) {
2377 /*
2378 * Add extended flag entry:
2379 */
2380 eodp->ed_ino = objnum;
2381 eodp->ed_reclen = reclen;
2382 /* NOTE: ed_off is the offset for the *next* entry */
2383 next = &(eodp->ed_off);
2384 eodp->ed_eflags = zap.za_normalization_conflict ?
2385 ED_CASE_CONFLICT : 0;
2386 (void) strncpy(eodp->ed_name, zap.za_name,
2387 EDIRENT_NAMELEN(reclen));
2388 eodp = (edirent_t *)((intptr_t)eodp + reclen);
2389 } else {
2390 /*
2391 * Add normal entry:
2392 */
2393 odp->d_ino = objnum;
2394 odp->d_reclen = reclen;
2395 /* NOTE: d_off is the offset for the *next* entry */
2396 next = &(odp->d_off);
2397 (void) strncpy(odp->d_name, zap.za_name,
2398 DIRENT64_NAMELEN(reclen));
2399 odp = (dirent64_t *)((intptr_t)odp + reclen);
2400 }
2401 outcount += reclen;
2402
2403 ASSERT(outcount <= bufsize);
2404
2405 /* Prefetch znode */
2406 if (prefetch)
2407 dmu_prefetch(os, objnum, 0, 0);
2408
2409 skip_entry:
2410 /*
2411 * Move to the next entry, fill in the previous offset.
2412 */
2413 if (offset > 2 || (offset == 2 && !zfs_show_ctldir(zp))) {
2414 zap_cursor_advance(&zc);
2415 offset = zap_cursor_serialize(&zc);
2416 } else {
2417 offset += 1;
2418 }
2419 if (next)
2420 *next = offset;
2421 }
2422 zp->z_zn_prefetch = B_FALSE; /* a lookup will re-enable pre-fetching */
2423
2424 if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iovcnt == 1) {
2425 iovp->iov_base += outcount;
2426 iovp->iov_len -= outcount;
2427 uio->uio_resid -= outcount;
2428 } else if (error = uiomove(outbuf, (long)outcount, UIO_READ, uio)) {
2429 /*
2430 * Reset the pointer.
2431 */
2432 offset = uio->uio_loffset;
2433 }
2434
2435 update:
2436 zap_cursor_fini(&zc);
2437 if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
2438 kmem_free(outbuf, bufsize);
2439
2440 if (error == ENOENT)
2441 error = 0;
2442
2443 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
2444
2445 uio->uio_loffset = offset;
2446 ZFS_EXIT(zfsvfs);
2447 return (error);
2448 }
2449
2450 ulong_t zfs_fsync_sync_cnt = 4;
2451
2452 static int
2453 zfs_fsync(vnode_t *vp, int syncflag, cred_t *cr, caller_context_t *ct)
2454 {
2455 znode_t *zp = VTOZ(vp);
2456 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2457
2458 /*
2459 * Regardless of whether this is required for standards conformance,
2460 * this is the logical behavior when fsync() is called on a file with
2461 * dirty pages. We use B_ASYNC since the ZIL transactions are already
2462 * going to be pushed out as part of the zil_commit().
2463 */
2464 if (vn_has_cached_data(vp) && !(syncflag & FNODSYNC) &&
2465 (vp->v_type == VREG) && !(IS_SWAPVP(vp)))
2466 (void) VOP_PUTPAGE(vp, (offset_t)0, (size_t)0, B_ASYNC, cr, ct);
2467
2468 (void) tsd_set(zfs_fsyncer_key, (void *)zfs_fsync_sync_cnt);
2469
2470 if (zfsvfs->z_os->os_sync != ZFS_SYNC_DISABLED) {
2471 ZFS_ENTER(zfsvfs);
2472 ZFS_VERIFY_ZP(zp);
2473 zil_commit(zfsvfs->z_log, zp->z_id);
2474 ZFS_EXIT(zfsvfs);
2475 }
2476 return (0);
2477 }
2478
2479
2480 /*
2481 * Get the requested file attributes and place them in the provided
2482 * vattr structure.
2483 *
2484 * IN: vp - vnode of file.
2485 * vap - va_mask identifies requested attributes.
2486 * If AT_XVATTR set, then optional attrs are requested
2487 * flags - ATTR_NOACLCHECK (CIFS server context)
2488 * cr - credentials of caller.
2489 * ct - caller context
2490 *
2491 * OUT: vap - attribute values.
2492 *
2493 * RETURN: 0 (always succeeds).
2494 */
2495 /* ARGSUSED */
2496 static int
2497 zfs_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
2498 caller_context_t *ct)
2499 {
2500 znode_t *zp = VTOZ(vp);
2501 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2502 int error = 0;
2503 uint64_t links;
2504 uint64_t mtime[2], ctime[2];
2505 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2506 xoptattr_t *xoap = NULL;
2507 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2508 sa_bulk_attr_t bulk[2];
2509 int count = 0;
2510
2511 ZFS_ENTER(zfsvfs);
2512 ZFS_VERIFY_ZP(zp);
2513
2514 zfs_fuid_map_ids(zp, cr, &vap->va_uid, &vap->va_gid);
2515
2516 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
2517 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
2518
2519 if ((error = sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) != 0) {
2520 ZFS_EXIT(zfsvfs);
2521 return (error);
2522 }
2523
2524 /*
2525 * If ACL is trivial don't bother looking for ACE_READ_ATTRIBUTES.
2526 * Also, if we are the owner don't bother, since owner should
2527 * always be allowed to read basic attributes of file.
2528 */
2529 if (!(zp->z_pflags & ZFS_ACL_TRIVIAL) &&
2530 (vap->va_uid != crgetuid(cr))) {
2531 if (error = zfs_zaccess(zp, ACE_READ_ATTRIBUTES, 0,
2532 skipaclchk, cr)) {
2533 ZFS_EXIT(zfsvfs);
2534 return (error);
2535 }
2536 }
2537
2538 /*
2539 * Return all attributes. It's cheaper to provide the answer
2540 * than to determine whether we were asked the question.
2541 */
2542
2543 mutex_enter(&zp->z_lock);
2544 vap->va_type = vp->v_type;
2545 vap->va_mode = zp->z_mode & MODEMASK;
2546 vap->va_fsid = zp->z_zfsvfs->z_vfs->vfs_dev;
2547 vap->va_nodeid = zp->z_id;
2548 if ((vp->v_flag & VROOT) && zfs_show_ctldir(zp))
2549 links = zp->z_links + 1;
2550 else
2551 links = zp->z_links;
2552 vap->va_nlink = MIN(links, UINT32_MAX); /* nlink_t limit! */
2553 vap->va_size = zp->z_size;
2554 vap->va_rdev = vp->v_rdev;
2555 vap->va_seq = zp->z_seq;
2556
2557 /*
2558 * Add in any requested optional attributes and the create time.
2559 * Also set the corresponding bits in the returned attribute bitmap.
2560 */
2561 if ((xoap = xva_getxoptattr(xvap)) != NULL && zfsvfs->z_use_fuids) {
2562 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
2563 xoap->xoa_archive =
2564 ((zp->z_pflags & ZFS_ARCHIVE) != 0);
2565 XVA_SET_RTN(xvap, XAT_ARCHIVE);
2566 }
2567
2568 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
2569 xoap->xoa_readonly =
2570 ((zp->z_pflags & ZFS_READONLY) != 0);
2571 XVA_SET_RTN(xvap, XAT_READONLY);
2572 }
2573
2574 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
2575 xoap->xoa_system =
2576 ((zp->z_pflags & ZFS_SYSTEM) != 0);
2577 XVA_SET_RTN(xvap, XAT_SYSTEM);
2578 }
2579
2580 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
2581 xoap->xoa_hidden =
2582 ((zp->z_pflags & ZFS_HIDDEN) != 0);
2583 XVA_SET_RTN(xvap, XAT_HIDDEN);
2584 }
2585
2586 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2587 xoap->xoa_nounlink =
2588 ((zp->z_pflags & ZFS_NOUNLINK) != 0);
2589 XVA_SET_RTN(xvap, XAT_NOUNLINK);
2590 }
2591
2592 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2593 xoap->xoa_immutable =
2594 ((zp->z_pflags & ZFS_IMMUTABLE) != 0);
2595 XVA_SET_RTN(xvap, XAT_IMMUTABLE);
2596 }
2597
2598 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2599 xoap->xoa_appendonly =
2600 ((zp->z_pflags & ZFS_APPENDONLY) != 0);
2601 XVA_SET_RTN(xvap, XAT_APPENDONLY);
2602 }
2603
2604 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2605 xoap->xoa_nodump =
2606 ((zp->z_pflags & ZFS_NODUMP) != 0);
2607 XVA_SET_RTN(xvap, XAT_NODUMP);
2608 }
2609
2610 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
2611 xoap->xoa_opaque =
2612 ((zp->z_pflags & ZFS_OPAQUE) != 0);
2613 XVA_SET_RTN(xvap, XAT_OPAQUE);
2614 }
2615
2616 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2617 xoap->xoa_av_quarantined =
2618 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0);
2619 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
2620 }
2621
2622 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2623 xoap->xoa_av_modified =
2624 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0);
2625 XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
2626 }
2627
2628 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) &&
2629 vp->v_type == VREG) {
2630 zfs_sa_get_scanstamp(zp, xvap);
2631 }
2632
2633 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
2634 uint64_t times[2];
2635
2636 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(zfsvfs),
2637 times, sizeof (times));
2638 ZFS_TIME_DECODE(&xoap->xoa_createtime, times);
2639 XVA_SET_RTN(xvap, XAT_CREATETIME);
2640 }
2641
2642 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2643 xoap->xoa_reparse = ((zp->z_pflags & ZFS_REPARSE) != 0);
2644 XVA_SET_RTN(xvap, XAT_REPARSE);
2645 }
2646 if (XVA_ISSET_REQ(xvap, XAT_GEN)) {
2647 xoap->xoa_generation = zp->z_gen;
2648 XVA_SET_RTN(xvap, XAT_GEN);
2649 }
2650
2651 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
2652 xoap->xoa_offline =
2653 ((zp->z_pflags & ZFS_OFFLINE) != 0);
2654 XVA_SET_RTN(xvap, XAT_OFFLINE);
2655 }
2656
2657 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
2658 xoap->xoa_sparse =
2659 ((zp->z_pflags & ZFS_SPARSE) != 0);
2660 XVA_SET_RTN(xvap, XAT_SPARSE);
2661 }
2662 }
2663
2664 ZFS_TIME_DECODE(&vap->va_atime, zp->z_atime);
2665 ZFS_TIME_DECODE(&vap->va_mtime, mtime);
2666 ZFS_TIME_DECODE(&vap->va_ctime, ctime);
2667
2668 mutex_exit(&zp->z_lock);
2669
2670 sa_object_size(zp->z_sa_hdl, &vap->va_blksize, &vap->va_nblocks);
2671
2672 if (zp->z_blksz == 0) {
2673 /*
2674 * Block size hasn't been set; suggest maximal I/O transfers.
2675 */
2676 vap->va_blksize = zfsvfs->z_max_blksz;
2677 }
2678
2679 ZFS_EXIT(zfsvfs);
2680 return (0);
2681 }
2682
2683 /*
2684 * Set the file attributes to the values contained in the
2685 * vattr structure.
2686 *
2687 * IN: vp - vnode of file to be modified.
2688 * vap - new attribute values.
2689 * If AT_XVATTR set, then optional attrs are being set
2690 * flags - ATTR_UTIME set if non-default time values provided.
2691 * - ATTR_NOACLCHECK (CIFS context only).
2692 * cr - credentials of caller.
2693 * ct - caller context
2694 *
2695 * RETURN: 0 on success, error code on failure.
2696 *
2697 * Timestamps:
2698 * vp - ctime updated, mtime updated if size changed.
2699 */
2700 /* ARGSUSED */
2701 static int
2702 zfs_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
2703 caller_context_t *ct)
2704 {
2705 znode_t *zp = VTOZ(vp);
2706 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2707 zilog_t *zilog;
2708 dmu_tx_t *tx;
2709 vattr_t oldva;
2710 xvattr_t tmpxvattr;
2711 uint_t mask = vap->va_mask;
2712 uint_t saved_mask = 0;
2713 int trim_mask = 0;
2714 uint64_t new_mode;
2715 uint64_t new_uid, new_gid;
2716 uint64_t xattr_obj;
2717 uint64_t mtime[2], ctime[2];
2718 znode_t *attrzp;
2719 int need_policy = FALSE;
2720 int err, err2;
2721 zfs_fuid_info_t *fuidp = NULL;
2722 xvattr_t *xvap = (xvattr_t *)vap; /* vap may be an xvattr_t * */
2723 xoptattr_t *xoap;
2724 zfs_acl_t *aclp;
2725 boolean_t skipaclchk = (flags & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
2726 boolean_t fuid_dirtied = B_FALSE;
2727 sa_bulk_attr_t bulk[7], xattr_bulk[7];
2728 int count = 0, xattr_count = 0;
2729
2730 if (mask == 0)
2731 return (0);
2732
2733 if (mask & AT_NOSET)
2734 return (SET_ERROR(EINVAL));
2735
2736 ZFS_ENTER(zfsvfs);
2737 ZFS_VERIFY_ZP(zp);
2738
2739 zilog = zfsvfs->z_log;
2740
2741 /*
2742 * Make sure that if we have ephemeral uid/gid or xvattr specified
2743 * that file system is at proper version level
2744 */
2745
2746 if (zfsvfs->z_use_fuids == B_FALSE &&
2747 (((mask & AT_UID) && IS_EPHEMERAL(vap->va_uid)) ||
2748 ((mask & AT_GID) && IS_EPHEMERAL(vap->va_gid)) ||
2749 (mask & AT_XVATTR))) {
2750 ZFS_EXIT(zfsvfs);
2751 return (SET_ERROR(EINVAL));
2752 }
2753
2754 if (mask & AT_SIZE && vp->v_type == VDIR) {
2755 ZFS_EXIT(zfsvfs);
2756 return (SET_ERROR(EISDIR));
2757 }
2758
2759 if (mask & AT_SIZE && vp->v_type != VREG && vp->v_type != VFIFO) {
2760 ZFS_EXIT(zfsvfs);
2761 return (SET_ERROR(EINVAL));
2762 }
2763
2764 /*
2765 * If this is an xvattr_t, then get a pointer to the structure of
2766 * optional attributes. If this is NULL, then we have a vattr_t.
2767 */
2768 xoap = xva_getxoptattr(xvap);
2769
2770 xva_init(&tmpxvattr);
2771
2772 /*
2773 * Immutable files can only alter immutable bit and atime
2774 */
2775 if ((zp->z_pflags & ZFS_IMMUTABLE) &&
2776 ((mask & (AT_SIZE|AT_UID|AT_GID|AT_MTIME|AT_MODE)) ||
2777 ((mask & AT_XVATTR) && XVA_ISSET_REQ(xvap, XAT_CREATETIME)))) {
2778 ZFS_EXIT(zfsvfs);
2779 return (SET_ERROR(EPERM));
2780 }
2781
2782 if ((mask & AT_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
2783 ZFS_EXIT(zfsvfs);
2784 return (SET_ERROR(EPERM));
2785 }
2786
2787 /*
2788 * Verify timestamps doesn't overflow 32 bits.
2789 * ZFS can handle large timestamps, but 32bit syscalls can't
2790 * handle times greater than 2039. This check should be removed
2791 * once large timestamps are fully supported.
2792 */
2793 if (mask & (AT_ATIME | AT_MTIME)) {
2794 if (((mask & AT_ATIME) && TIMESPEC_OVERFLOW(&vap->va_atime)) ||
2795 ((mask & AT_MTIME) && TIMESPEC_OVERFLOW(&vap->va_mtime))) {
2796 ZFS_EXIT(zfsvfs);
2797 return (SET_ERROR(EOVERFLOW));
2798 }
2799 }
2800
2801 top:
2802 attrzp = NULL;
2803 aclp = NULL;
2804
2805 /* Can this be moved to before the top label? */
2806 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
2807 ZFS_EXIT(zfsvfs);
2808 return (SET_ERROR(EROFS));
2809 }
2810
2811 /*
2812 * First validate permissions
2813 */
2814
2815 if (mask & AT_SIZE) {
2816 err = zfs_zaccess(zp, ACE_WRITE_DATA, 0, skipaclchk, cr);
2817 if (err) {
2818 ZFS_EXIT(zfsvfs);
2819 return (err);
2820 }
2821 /*
2822 * XXX - Note, we are not providing any open
2823 * mode flags here (like FNDELAY), so we may
2824 * block if there are locks present... this
2825 * should be addressed in openat().
2826 */
2827 /* XXX - would it be OK to generate a log record here? */
2828 err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);
2829 if (err) {
2830 ZFS_EXIT(zfsvfs);
2831 return (err);
2832 }
2833
2834 if (vap->va_size == 0)
2835 vnevent_truncate(ZTOV(zp), ct);
2836 }
2837
2838 if (mask & (AT_ATIME|AT_MTIME) ||
2839 ((mask & AT_XVATTR) && (XVA_ISSET_REQ(xvap, XAT_HIDDEN) ||
2840 XVA_ISSET_REQ(xvap, XAT_READONLY) ||
2841 XVA_ISSET_REQ(xvap, XAT_ARCHIVE) ||
2842 XVA_ISSET_REQ(xvap, XAT_OFFLINE) ||
2843 XVA_ISSET_REQ(xvap, XAT_SPARSE) ||
2844 XVA_ISSET_REQ(xvap, XAT_CREATETIME) ||
2845 XVA_ISSET_REQ(xvap, XAT_SYSTEM)))) {
2846 need_policy = zfs_zaccess(zp, ACE_WRITE_ATTRIBUTES, 0,
2847 skipaclchk, cr);
2848 }
2849
2850 if (mask & (AT_UID|AT_GID)) {
2851 int idmask = (mask & (AT_UID|AT_GID));
2852 int take_owner;
2853 int take_group;
2854
2855 /*
2856 * NOTE: even if a new mode is being set,
2857 * we may clear S_ISUID/S_ISGID bits.
2858 */
2859
2860 if (!(mask & AT_MODE))
2861 vap->va_mode = zp->z_mode;
2862
2863 /*
2864 * Take ownership or chgrp to group we are a member of
2865 */
2866
2867 take_owner = (mask & AT_UID) && (vap->va_uid == crgetuid(cr));
2868 take_group = (mask & AT_GID) &&
2869 zfs_groupmember(zfsvfs, vap->va_gid, cr);
2870
2871 /*
2872 * If both AT_UID and AT_GID are set then take_owner and
2873 * take_group must both be set in order to allow taking
2874 * ownership.
2875 *
2876 * Otherwise, send the check through secpolicy_vnode_setattr()
2877 *
2878 */
2879
2880 if (((idmask == (AT_UID|AT_GID)) && take_owner && take_group) ||
2881 ((idmask == AT_UID) && take_owner) ||
2882 ((idmask == AT_GID) && take_group)) {
2883 if (zfs_zaccess(zp, ACE_WRITE_OWNER, 0,
2884 skipaclchk, cr) == 0) {
2885 /*
2886 * Remove setuid/setgid for non-privileged users
2887 */
2888 secpolicy_setid_clear(vap, cr);
2889 trim_mask = (mask & (AT_UID|AT_GID));
2890 } else {
2891 need_policy = TRUE;
2892 }
2893 } else {
2894 need_policy = TRUE;
2895 }
2896 }
2897
2898 mutex_enter(&zp->z_lock);
2899 oldva.va_mode = zp->z_mode;
2900 zfs_fuid_map_ids(zp, cr, &oldva.va_uid, &oldva.va_gid);
2901 if (mask & AT_XVATTR) {
2902 /*
2903 * Update xvattr mask to include only those attributes
2904 * that are actually changing.
2905 *
2906 * the bits will be restored prior to actually setting
2907 * the attributes so the caller thinks they were set.
2908 */
2909 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
2910 if (xoap->xoa_appendonly !=
2911 ((zp->z_pflags & ZFS_APPENDONLY) != 0)) {
2912 need_policy = TRUE;
2913 } else {
2914 XVA_CLR_REQ(xvap, XAT_APPENDONLY);
2915 XVA_SET_REQ(&tmpxvattr, XAT_APPENDONLY);
2916 }
2917 }
2918
2919 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
2920 if (xoap->xoa_nounlink !=
2921 ((zp->z_pflags & ZFS_NOUNLINK) != 0)) {
2922 need_policy = TRUE;
2923 } else {
2924 XVA_CLR_REQ(xvap, XAT_NOUNLINK);
2925 XVA_SET_REQ(&tmpxvattr, XAT_NOUNLINK);
2926 }
2927 }
2928
2929 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
2930 if (xoap->xoa_immutable !=
2931 ((zp->z_pflags & ZFS_IMMUTABLE) != 0)) {
2932 need_policy = TRUE;
2933 } else {
2934 XVA_CLR_REQ(xvap, XAT_IMMUTABLE);
2935 XVA_SET_REQ(&tmpxvattr, XAT_IMMUTABLE);
2936 }
2937 }
2938
2939 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
2940 if (xoap->xoa_nodump !=
2941 ((zp->z_pflags & ZFS_NODUMP) != 0)) {
2942 need_policy = TRUE;
2943 } else {
2944 XVA_CLR_REQ(xvap, XAT_NODUMP);
2945 XVA_SET_REQ(&tmpxvattr, XAT_NODUMP);
2946 }
2947 }
2948
2949 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
2950 if (xoap->xoa_av_modified !=
2951 ((zp->z_pflags & ZFS_AV_MODIFIED) != 0)) {
2952 need_policy = TRUE;
2953 } else {
2954 XVA_CLR_REQ(xvap, XAT_AV_MODIFIED);
2955 XVA_SET_REQ(&tmpxvattr, XAT_AV_MODIFIED);
2956 }
2957 }
2958
2959 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
2960 if ((vp->v_type != VREG &&
2961 xoap->xoa_av_quarantined) ||
2962 xoap->xoa_av_quarantined !=
2963 ((zp->z_pflags & ZFS_AV_QUARANTINED) != 0)) {
2964 need_policy = TRUE;
2965 } else {
2966 XVA_CLR_REQ(xvap, XAT_AV_QUARANTINED);
2967 XVA_SET_REQ(&tmpxvattr, XAT_AV_QUARANTINED);
2968 }
2969 }
2970
2971 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
2972 mutex_exit(&zp->z_lock);
2973 ZFS_EXIT(zfsvfs);
2974 return (SET_ERROR(EPERM));
2975 }
2976
2977 if (need_policy == FALSE &&
2978 (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP) ||
2979 XVA_ISSET_REQ(xvap, XAT_OPAQUE))) {
2980 need_policy = TRUE;
2981 }
2982 }
2983
2984 mutex_exit(&zp->z_lock);
2985
2986 if (mask & AT_MODE) {
2987 if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr) == 0) {
2988 err = secpolicy_setid_setsticky_clear(vp, vap,
2989 &oldva, cr);
2990 if (err) {
2991 ZFS_EXIT(zfsvfs);
2992 return (err);
2993 }
2994 trim_mask |= AT_MODE;
2995 } else {
2996 need_policy = TRUE;
2997 }
2998 }
2999
3000 if (need_policy) {
3001 /*
3002 * If trim_mask is set then take ownership
3003 * has been granted or write_acl is present and user
3004 * has the ability to modify mode. In that case remove
3005 * UID|GID and or MODE from mask so that
3006 * secpolicy_vnode_setattr() doesn't revoke it.
3007 */
3008
3009 if (trim_mask) {
3010 saved_mask = vap->va_mask;
3011 vap->va_mask &= ~trim_mask;
3012 }
3013 err = secpolicy_vnode_setattr(cr, vp, vap, &oldva, flags,
3014 (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
3015 if (err) {
3016 ZFS_EXIT(zfsvfs);
3017 return (err);
3018 }
3019
3020 if (trim_mask)
3021 vap->va_mask |= saved_mask;
3022 }
3023
3024 /*
3025 * secpolicy_vnode_setattr, or take ownership may have
3026 * changed va_mask
3027 */
3028 mask = vap->va_mask;
3029
3030 if ((mask & (AT_UID | AT_GID))) {
3031 err = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
3032 &xattr_obj, sizeof (xattr_obj));
3033
3034 if (err == 0 && xattr_obj) {
3035 err = zfs_zget(zp->z_zfsvfs, xattr_obj, &attrzp);
3036 if (err)
3037 goto out2;
3038 }
3039 if (mask & AT_UID) {
3040 new_uid = zfs_fuid_create(zfsvfs,
3041 (uint64_t)vap->va_uid, cr, ZFS_OWNER, &fuidp);
3042 if (new_uid != zp->z_uid &&
3043 zfs_fuid_overquota(zfsvfs, B_FALSE, new_uid)) {
3044 if (attrzp)
3045 VN_RELE(ZTOV(attrzp));
3046 err = SET_ERROR(EDQUOT);
3047 goto out2;
3048 }
3049 }
3050
3051 if (mask & AT_GID) {
3052 new_gid = zfs_fuid_create(zfsvfs, (uint64_t)vap->va_gid,
3053 cr, ZFS_GROUP, &fuidp);
3054 if (new_gid != zp->z_gid &&
3055 zfs_fuid_overquota(zfsvfs, B_TRUE, new_gid)) {
3056 if (attrzp)
3057 VN_RELE(ZTOV(attrzp));
3058 err = SET_ERROR(EDQUOT);
3059 goto out2;
3060 }
3061 }
3062 }
3063 tx = dmu_tx_create(zfsvfs->z_os);
3064
3065 if (mask & AT_MODE) {
3066 uint64_t pmode = zp->z_mode;
3067 uint64_t acl_obj;
3068 new_mode = (pmode & S_IFMT) | (vap->va_mode & ~S_IFMT);
3069
3070 if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED &&
3071 !(zp->z_pflags & ZFS_ACL_TRIVIAL)) {
3072 err = SET_ERROR(EPERM);
3073 goto out;
3074 }
3075
3076 if (err = zfs_acl_chmod_setattr(zp, &aclp, new_mode))
3077 goto out;
3078
3079 mutex_enter(&zp->z_lock);
3080 if (!zp->z_is_sa && ((acl_obj = zfs_external_acl(zp)) != 0)) {
3081 /*
3082 * Are we upgrading ACL from old V0 format
3083 * to V1 format?
3084 */
3085 if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
3086 zfs_znode_acl_version(zp) ==
3087 ZFS_ACL_VERSION_INITIAL) {
3088 dmu_tx_hold_free(tx, acl_obj, 0,
3089 DMU_OBJECT_END);
3090 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3091 0, aclp->z_acl_bytes);
3092 } else {
3093 dmu_tx_hold_write(tx, acl_obj, 0,
3094 aclp->z_acl_bytes);
3095 }
3096 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3097 dmu_tx_hold_write(tx, DMU_NEW_OBJECT,
3098 0, aclp->z_acl_bytes);
3099 }
3100 mutex_exit(&zp->z_lock);
3101 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3102 } else {
3103 if ((mask & AT_XVATTR) &&
3104 XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3105 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
3106 else
3107 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
3108 }
3109
3110 if (attrzp) {
3111 dmu_tx_hold_sa(tx, attrzp->z_sa_hdl, B_FALSE);
3112 }
3113
3114 fuid_dirtied = zfsvfs->z_fuid_dirty;
3115 if (fuid_dirtied)
3116 zfs_fuid_txhold(zfsvfs, tx);
3117
3118 zfs_sa_upgrade_txholds(tx, zp);
3119
3120 err = dmu_tx_assign(tx, TXG_WAIT);
3121 if (err)
3122 goto out;
3123
3124 count = 0;
3125 /*
3126 * Set each attribute requested.
3127 * We group settings according to the locks they need to acquire.
3128 *
3129 * Note: you cannot set ctime directly, although it will be
3130 * updated as a side-effect of calling this function.
3131 */
3132
3133
3134 if (mask & (AT_UID|AT_GID|AT_MODE))
3135 mutex_enter(&zp->z_acl_lock);
3136 mutex_enter(&zp->z_lock);
3137
3138 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
3139 &zp->z_pflags, sizeof (zp->z_pflags));
3140
3141 if (attrzp) {
3142 if (mask & (AT_UID|AT_GID|AT_MODE))
3143 mutex_enter(&attrzp->z_acl_lock);
3144 mutex_enter(&attrzp->z_lock);
3145 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3146 SA_ZPL_FLAGS(zfsvfs), NULL, &attrzp->z_pflags,
3147 sizeof (attrzp->z_pflags));
3148 }
3149
3150 if (mask & (AT_UID|AT_GID)) {
3151
3152 if (mask & AT_UID) {
3153 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
3154 &new_uid, sizeof (new_uid));
3155 zp->z_uid = new_uid;
3156 if (attrzp) {
3157 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3158 SA_ZPL_UID(zfsvfs), NULL, &new_uid,
3159 sizeof (new_uid));
3160 attrzp->z_uid = new_uid;
3161 }
3162 }
3163
3164 if (mask & AT_GID) {
3165 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs),
3166 NULL, &new_gid, sizeof (new_gid));
3167 zp->z_gid = new_gid;
3168 if (attrzp) {
3169 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3170 SA_ZPL_GID(zfsvfs), NULL, &new_gid,
3171 sizeof (new_gid));
3172 attrzp->z_gid = new_gid;
3173 }
3174 }
3175 if (!(mask & AT_MODE)) {
3176 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs),
3177 NULL, &new_mode, sizeof (new_mode));
3178 new_mode = zp->z_mode;
3179 }
3180 err = zfs_acl_chown_setattr(zp);
3181 ASSERT(err == 0);
3182 if (attrzp) {
3183 err = zfs_acl_chown_setattr(attrzp);
3184 ASSERT(err == 0);
3185 }
3186 }
3187
3188 if (mask & AT_MODE) {
3189 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
3190 &new_mode, sizeof (new_mode));
3191 zp->z_mode = new_mode;
3192 ASSERT3U((uintptr_t)aclp, !=, NULL);
3193 err = zfs_aclset_common(zp, aclp, cr, tx);
3194 ASSERT0(err);
3195 if (zp->z_acl_cached)
3196 zfs_acl_free(zp->z_acl_cached);
3197 zp->z_acl_cached = aclp;
3198 aclp = NULL;
3199 }
3200
3201
3202 if (mask & AT_ATIME) {
3203 ZFS_TIME_ENCODE(&vap->va_atime, zp->z_atime);
3204 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
3205 &zp->z_atime, sizeof (zp->z_atime));
3206 }
3207
3208 if (mask & AT_MTIME) {
3209 ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
3210 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
3211 mtime, sizeof (mtime));
3212 }
3213
3214 /* XXX - shouldn't this be done *before* the ATIME/MTIME checks? */
3215 if (mask & AT_SIZE && !(mask & AT_MTIME)) {
3216 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
3217 NULL, mtime, sizeof (mtime));
3218 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
3219 &ctime, sizeof (ctime));
3220 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
3221 B_TRUE);
3222 } else if (mask != 0) {
3223 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
3224 &ctime, sizeof (ctime));
3225 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime,
3226 B_TRUE);
3227 if (attrzp) {
3228 SA_ADD_BULK_ATTR(xattr_bulk, xattr_count,
3229 SA_ZPL_CTIME(zfsvfs), NULL,
3230 &ctime, sizeof (ctime));
3231 zfs_tstamp_update_setup(attrzp, STATE_CHANGED,
3232 mtime, ctime, B_TRUE);
3233 }
3234 }
3235 /*
3236 * Do this after setting timestamps to prevent timestamp
3237 * update from toggling bit
3238 */
3239
3240 if (xoap && (mask & AT_XVATTR)) {
3241
3242 /*
3243 * restore trimmed off masks
3244 * so that return masks can be set for caller.
3245 */
3246
3247 if (XVA_ISSET_REQ(&tmpxvattr, XAT_APPENDONLY)) {
3248 XVA_SET_REQ(xvap, XAT_APPENDONLY);
3249 }
3250 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NOUNLINK)) {
3251 XVA_SET_REQ(xvap, XAT_NOUNLINK);
3252 }
3253 if (XVA_ISSET_REQ(&tmpxvattr, XAT_IMMUTABLE)) {
3254 XVA_SET_REQ(xvap, XAT_IMMUTABLE);
3255 }
3256 if (XVA_ISSET_REQ(&tmpxvattr, XAT_NODUMP)) {
3257 XVA_SET_REQ(xvap, XAT_NODUMP);
3258 }
3259 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_MODIFIED)) {
3260 XVA_SET_REQ(xvap, XAT_AV_MODIFIED);
3261 }
3262 if (XVA_ISSET_REQ(&tmpxvattr, XAT_AV_QUARANTINED)) {
3263 XVA_SET_REQ(xvap, XAT_AV_QUARANTINED);
3264 }
3265
3266 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP))
3267 ASSERT(vp->v_type == VREG);
3268
3269 zfs_xvattr_set(zp, xvap, tx);
3270 }
3271
3272 if (fuid_dirtied)
3273 zfs_fuid_sync(zfsvfs, tx);
3274
3275 if (mask != 0)
3276 zfs_log_setattr(zilog, tx, TX_SETATTR, zp, vap, mask, fuidp);
3277
3278 mutex_exit(&zp->z_lock);
3279 if (mask & (AT_UID|AT_GID|AT_MODE))
3280 mutex_exit(&zp->z_acl_lock);
3281
3282 if (attrzp) {
3283 if (mask & (AT_UID|AT_GID|AT_MODE))
3284 mutex_exit(&attrzp->z_acl_lock);
3285 mutex_exit(&attrzp->z_lock);
3286 }
3287 out:
3288 if (err == 0 && attrzp) {
3289 err2 = sa_bulk_update(attrzp->z_sa_hdl, xattr_bulk,
3290 xattr_count, tx);
3291 ASSERT(err2 == 0);
3292 }
3293
3294 if (attrzp)
3295 VN_RELE(ZTOV(attrzp));
3296
3297 if (aclp)
3298 zfs_acl_free(aclp);
3299
3300 if (fuidp) {
3301 zfs_fuid_info_free(fuidp);
3302 fuidp = NULL;
3303 }
3304
3305 if (err) {
3306 dmu_tx_abort(tx);
3307 if (err == ERESTART)
3308 goto top;
3309 } else {
3310 err2 = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
3311 dmu_tx_commit(tx);
3312 }
3313
3314 out2:
3315 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3316 zil_commit(zilog, 0);
3317
3318 ZFS_EXIT(zfsvfs);
3319 return (err);
3320 }
3321
3322 typedef struct zfs_zlock {
3323 krwlock_t *zl_rwlock; /* lock we acquired */
3324 znode_t *zl_znode; /* znode we held */
3325 struct zfs_zlock *zl_next; /* next in list */
3326 } zfs_zlock_t;
3327
3328 /*
3329 * Drop locks and release vnodes that were held by zfs_rename_lock().
3330 */
3331 static void
3332 zfs_rename_unlock(zfs_zlock_t **zlpp)
3333 {
3334 zfs_zlock_t *zl;
3335
3336 while ((zl = *zlpp) != NULL) {
3337 if (zl->zl_znode != NULL)
3338 VN_RELE(ZTOV(zl->zl_znode));
3339 rw_exit(zl->zl_rwlock);
3340 *zlpp = zl->zl_next;
3341 kmem_free(zl, sizeof (*zl));
3342 }
3343 }
3344
3345 /*
3346 * Search back through the directory tree, using the ".." entries.
3347 * Lock each directory in the chain to prevent concurrent renames.
3348 * Fail any attempt to move a directory into one of its own descendants.
3349 * XXX - z_parent_lock can overlap with map or grow locks
3350 */
3351 static int
3352 zfs_rename_lock(znode_t *szp, znode_t *tdzp, znode_t *sdzp, zfs_zlock_t **zlpp)
3353 {
3354 zfs_zlock_t *zl;
3355 znode_t *zp = tdzp;
3356 uint64_t rootid = zp->z_zfsvfs->z_root;
3357 uint64_t oidp = zp->z_id;
3358 krwlock_t *rwlp = &szp->z_parent_lock;
3359 krw_t rw = RW_WRITER;
3360
3361 /*
3362 * First pass write-locks szp and compares to zp->z_id.
3363 * Later passes read-lock zp and compare to zp->z_parent.
3364 */
3365 do {
3366 if (!rw_tryenter(rwlp, rw)) {
3367 /*
3368 * Another thread is renaming in this path.
3369 * Note that if we are a WRITER, we don't have any
3370 * parent_locks held yet.
3371 */
3372 if (rw == RW_READER && zp->z_id > szp->z_id) {
3373 /*
3374 * Drop our locks and restart
3375 */
3376 zfs_rename_unlock(&zl);
3377 *zlpp = NULL;
3378 zp = tdzp;
3379 oidp = zp->z_id;
3380 rwlp = &szp->z_parent_lock;
3381 rw = RW_WRITER;
3382 continue;
3383 } else {
3384 /*
3385 * Wait for other thread to drop its locks
3386 */
3387 rw_enter(rwlp, rw);
3388 }
3389 }
3390
3391 zl = kmem_alloc(sizeof (*zl), KM_SLEEP);
3392 zl->zl_rwlock = rwlp;
3393 zl->zl_znode = NULL;
3394 zl->zl_next = *zlpp;
3395 *zlpp = zl;
3396
3397 if (oidp == szp->z_id) /* We're a descendant of szp */
3398 return (SET_ERROR(EINVAL));
3399
3400 if (oidp == rootid) /* We've hit the top */
3401 return (0);
3402
3403 if (rw == RW_READER) { /* i.e. not the first pass */
3404 int error = zfs_zget(zp->z_zfsvfs, oidp, &zp);
3405 if (error)
3406 return (error);
3407 zl->zl_znode = zp;
3408 }
3409 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(zp->z_zfsvfs),
3410 &oidp, sizeof (oidp));
3411 rwlp = &zp->z_parent_lock;
3412 rw = RW_READER;
3413
3414 } while (zp->z_id != sdzp->z_id);
3415
3416 return (0);
3417 }
3418
3419 /*
3420 * Move an entry from the provided source directory to the target
3421 * directory. Change the entry name as indicated.
3422 *
3423 * IN: sdvp - Source directory containing the "old entry".
3424 * snm - Old entry name.
3425 * tdvp - Target directory to contain the "new entry".
3426 * tnm - New entry name.
3427 * cr - credentials of caller.
3428 * ct - caller context
3429 * flags - case flags
3430 *
3431 * RETURN: 0 on success, error code on failure.
3432 *
3433 * Timestamps:
3434 * sdvp,tdvp - ctime|mtime updated
3435 */
3436 /*ARGSUSED*/
3437 static int
3438 zfs_rename(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm, cred_t *cr,
3439 caller_context_t *ct, int flags)
3440 {
3441 znode_t *tdzp, *szp, *tzp;
3442 znode_t *sdzp = VTOZ(sdvp);
3443 zfsvfs_t *zfsvfs = sdzp->z_zfsvfs;
3444 zilog_t *zilog;
3445 vnode_t *realvp;
3446 zfs_dirlock_t *sdl, *tdl;
3447 dmu_tx_t *tx;
3448 zfs_zlock_t *zl;
3449 int cmp, serr, terr;
3450 int error = 0;
3451 int zflg = 0;
3452 boolean_t waited = B_FALSE;
3453
3454 ZFS_ENTER(zfsvfs);
3455 ZFS_VERIFY_ZP(sdzp);
3456 zilog = zfsvfs->z_log;
3457
3458 /*
3459 * Make sure we have the real vp for the target directory.
3460 */
3461 if (VOP_REALVP(tdvp, &realvp, ct) == 0)
3462 tdvp = realvp;
3463
3464 tdzp = VTOZ(tdvp);
3465 ZFS_VERIFY_ZP(tdzp);
3466
3467 /*
3468 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the
3469 * ctldir appear to have the same v_vfsp.
3470 */
3471 if (tdzp->z_zfsvfs != zfsvfs || zfsctl_is_node(tdvp)) {
3472 ZFS_EXIT(zfsvfs);
3473 return (SET_ERROR(EXDEV));
3474 }
3475
3476 if (zfsvfs->z_utf8 && u8_validate(tnm,
3477 strlen(tnm), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3478 ZFS_EXIT(zfsvfs);
3479 return (SET_ERROR(EILSEQ));
3480 }
3481
3482 if (flags & FIGNORECASE)
3483 zflg |= ZCILOOK;
3484
3485 top:
3486 szp = NULL;
3487 tzp = NULL;
3488 zl = NULL;
3489
3490 /*
3491 * This is to prevent the creation of links into attribute space
3492 * by renaming a linked file into/outof an attribute directory.
3493 * See the comment in zfs_link() for why this is considered bad.
3494 */
3495 if ((tdzp->z_pflags & ZFS_XATTR) != (sdzp->z_pflags & ZFS_XATTR)) {
3496 ZFS_EXIT(zfsvfs);
3497 return (SET_ERROR(EINVAL));
3498 }
3499
3500 /*
3501 * Lock source and target directory entries. To prevent deadlock,
3502 * a lock ordering must be defined. We lock the directory with
3503 * the smallest object id first, or if it's a tie, the one with
3504 * the lexically first name.
3505 */
3506 if (sdzp->z_id < tdzp->z_id) {
3507 cmp = -1;
3508 } else if (sdzp->z_id > tdzp->z_id) {
3509 cmp = 1;
3510 } else {
3511 /*
3512 * First compare the two name arguments without
3513 * considering any case folding.
3514 */
3515 int nofold = (zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER);
3516
3517 cmp = u8_strcmp(snm, tnm, 0, nofold, U8_UNICODE_LATEST, &error);
3518 ASSERT(error == 0 || !zfsvfs->z_utf8);
3519 if (cmp == 0) {
3520 /*
3521 * POSIX: "If the old argument and the new argument
3522 * both refer to links to the same existing file,
3523 * the rename() function shall return successfully
3524 * and perform no other action."
3525 */
3526 ZFS_EXIT(zfsvfs);
3527 return (0);
3528 }
3529 /*
3530 * If the file system is case-folding, then we may
3531 * have some more checking to do. A case-folding file
3532 * system is either supporting mixed case sensitivity
3533 * access or is completely case-insensitive. Note
3534 * that the file system is always case preserving.
3535 *
3536 * In mixed sensitivity mode case sensitive behavior
3537 * is the default. FIGNORECASE must be used to
3538 * explicitly request case insensitive behavior.
3539 *
3540 * If the source and target names provided differ only
3541 * by case (e.g., a request to rename 'tim' to 'Tim'),
3542 * we will treat this as a special case in the
3543 * case-insensitive mode: as long as the source name
3544 * is an exact match, we will allow this to proceed as
3545 * a name-change request.
3546 */
3547 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
3548 (zfsvfs->z_case == ZFS_CASE_MIXED &&
3549 flags & FIGNORECASE)) &&
3550 u8_strcmp(snm, tnm, 0, zfsvfs->z_norm, U8_UNICODE_LATEST,
3551 &error) == 0) {
3552 /*
3553 * case preserving rename request, require exact
3554 * name matches
3555 */
3556 zflg |= ZCIEXACT;
3557 zflg &= ~ZCILOOK;
3558 }
3559 }
3560
3561 /*
3562 * If the source and destination directories are the same, we should
3563 * grab the z_name_lock of that directory only once.
3564 */
3565 if (sdzp == tdzp) {
3566 zflg |= ZHAVELOCK;
3567 rw_enter(&sdzp->z_name_lock, RW_READER);
3568 }
3569
3570 if (cmp < 0) {
3571 serr = zfs_dirent_lock(&sdl, sdzp, snm, &szp,
3572 ZEXISTS | zflg, NULL, NULL);
3573 terr = zfs_dirent_lock(&tdl,
3574 tdzp, tnm, &tzp, ZRENAMING | zflg, NULL, NULL);
3575 } else {
3576 terr = zfs_dirent_lock(&tdl,
3577 tdzp, tnm, &tzp, zflg, NULL, NULL);
3578 serr = zfs_dirent_lock(&sdl,
3579 sdzp, snm, &szp, ZEXISTS | ZRENAMING | zflg,
3580 NULL, NULL);
3581 }
3582
3583 if (serr) {
3584 /*
3585 * Source entry invalid or not there.
3586 */
3587 if (!terr) {
3588 zfs_dirent_unlock(tdl);
3589 if (tzp)
3590 VN_RELE(ZTOV(tzp));
3591 }
3592
3593 if (sdzp == tdzp)
3594 rw_exit(&sdzp->z_name_lock);
3595
3596 if (strcmp(snm, "..") == 0)
3597 serr = SET_ERROR(EINVAL);
3598 ZFS_EXIT(zfsvfs);
3599 return (serr);
3600 }
3601 if (terr) {
3602 zfs_dirent_unlock(sdl);
3603 VN_RELE(ZTOV(szp));
3604
3605 if (sdzp == tdzp)
3606 rw_exit(&sdzp->z_name_lock);
3607
3608 if (strcmp(tnm, "..") == 0)
3609 terr = SET_ERROR(EINVAL);
3610 ZFS_EXIT(zfsvfs);
3611 return (terr);
3612 }
3613
3614 /*
3615 * Must have write access at the source to remove the old entry
3616 * and write access at the target to create the new entry.
3617 * Note that if target and source are the same, this can be
3618 * done in a single check.
3619 */
3620
3621 if (error = zfs_zaccess_rename(sdzp, szp, tdzp, tzp, cr))
3622 goto out;
3623
3624 if (ZTOV(szp)->v_type == VDIR) {
3625 /*
3626 * Check to make sure rename is valid.
3627 * Can't do a move like this: /usr/a/b to /usr/a/b/c/d
3628 */
3629 if (error = zfs_rename_lock(szp, tdzp, sdzp, &zl))
3630 goto out;
3631 }
3632
3633 /*
3634 * Does target exist?
3635 */
3636 if (tzp) {
3637 /*
3638 * Source and target must be the same type.
3639 */
3640 if (ZTOV(szp)->v_type == VDIR) {
3641 if (ZTOV(tzp)->v_type != VDIR) {
3642 error = SET_ERROR(ENOTDIR);
3643 goto out;
3644 }
3645 } else {
3646 if (ZTOV(tzp)->v_type == VDIR) {
3647 error = SET_ERROR(EISDIR);
3648 goto out;
3649 }
3650 }
3651 /*
3652 * POSIX dictates that when the source and target
3653 * entries refer to the same file object, rename
3654 * must do nothing and exit without error.
3655 */
3656 if (szp->z_id == tzp->z_id) {
3657 error = 0;
3658 goto out;
3659 }
3660 }
3661
3662 vnevent_rename_src(ZTOV(szp), sdvp, snm, ct);
3663 if (tzp)
3664 vnevent_rename_dest(ZTOV(tzp), tdvp, tnm, ct);
3665
3666 /*
3667 * notify the target directory if it is not the same
3668 * as source directory.
3669 */
3670 if (tdvp != sdvp) {
3671 vnevent_rename_dest_dir(tdvp, ct);
3672 }
3673
3674 tx = dmu_tx_create(zfsvfs->z_os);
3675 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
3676 dmu_tx_hold_sa(tx, sdzp->z_sa_hdl, B_FALSE);
3677 dmu_tx_hold_zap(tx, sdzp->z_id, FALSE, snm);
3678 dmu_tx_hold_zap(tx, tdzp->z_id, TRUE, tnm);
3679 if (sdzp != tdzp) {
3680 dmu_tx_hold_sa(tx, tdzp->z_sa_hdl, B_FALSE);
3681 zfs_sa_upgrade_txholds(tx, tdzp);
3682 }
3683 if (tzp) {
3684 dmu_tx_hold_sa(tx, tzp->z_sa_hdl, B_FALSE);
3685 zfs_sa_upgrade_txholds(tx, tzp);
3686 }
3687
3688 zfs_sa_upgrade_txholds(tx, szp);
3689 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
3690 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3691 if (error) {
3692 if (zl != NULL)
3693 zfs_rename_unlock(&zl);
3694 zfs_dirent_unlock(sdl);
3695 zfs_dirent_unlock(tdl);
3696
3697 if (sdzp == tdzp)
3698 rw_exit(&sdzp->z_name_lock);
3699
3700 VN_RELE(ZTOV(szp));
3701 if (tzp)
3702 VN_RELE(ZTOV(tzp));
3703 if (error == ERESTART) {
3704 waited = B_TRUE;
3705 dmu_tx_wait(tx);
3706 dmu_tx_abort(tx);
3707 goto top;
3708 }
3709 dmu_tx_abort(tx);
3710 ZFS_EXIT(zfsvfs);
3711 return (error);
3712 }
3713
3714 if (tzp) /* Attempt to remove the existing target */
3715 error = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
3716
3717 if (error == 0) {
3718 error = zfs_link_create(tdl, szp, tx, ZRENAMING);
3719 if (error == 0) {
3720 szp->z_pflags |= ZFS_AV_MODIFIED;
3721
3722 error = sa_update(szp->z_sa_hdl, SA_ZPL_FLAGS(zfsvfs),
3723 (void *)&szp->z_pflags, sizeof (uint64_t), tx);
3724 ASSERT0(error);
3725
3726 error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
3727 if (error == 0) {
3728 zfs_log_rename(zilog, tx, TX_RENAME |
3729 (flags & FIGNORECASE ? TX_CI : 0), sdzp,
3730 sdl->dl_name, tdzp, tdl->dl_name, szp);
3731
3732 /*
3733 * Update path information for the target vnode
3734 */
3735 vn_renamepath(tdvp, ZTOV(szp), tnm,
3736 strlen(tnm));
3737 } else {
3738 /*
3739 * At this point, we have successfully created
3740 * the target name, but have failed to remove
3741 * the source name. Since the create was done
3742 * with the ZRENAMING flag, there are
3743 * complications; for one, the link count is
3744 * wrong. The easiest way to deal with this
3745 * is to remove the newly created target, and
3746 * return the original error. This must
3747 * succeed; fortunately, it is very unlikely to
3748 * fail, since we just created it.
3749 */
3750 VERIFY3U(zfs_link_destroy(tdl, szp, tx,
3751 ZRENAMING, NULL), ==, 0);
3752 }
3753 }
3754 }
3755
3756 dmu_tx_commit(tx);
3757 out:
3758 if (zl != NULL)
3759 zfs_rename_unlock(&zl);
3760
3761 zfs_dirent_unlock(sdl);
3762 zfs_dirent_unlock(tdl);
3763
3764 if (sdzp == tdzp)
3765 rw_exit(&sdzp->z_name_lock);
3766
3767
3768 VN_RELE(ZTOV(szp));
3769 if (tzp)
3770 VN_RELE(ZTOV(tzp));
3771
3772 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3773 zil_commit(zilog, 0);
3774
3775 ZFS_EXIT(zfsvfs);
3776 return (error);
3777 }
3778
3779 /*
3780 * Insert the indicated symbolic reference entry into the directory.
3781 *
3782 * IN: dvp - Directory to contain new symbolic link.
3783 * link - Name for new symlink entry.
3784 * vap - Attributes of new entry.
3785 * cr - credentials of caller.
3786 * ct - caller context
3787 * flags - case flags
3788 *
3789 * RETURN: 0 on success, error code on failure.
3790 *
3791 * Timestamps:
3792 * dvp - ctime|mtime updated
3793 */
3794 /*ARGSUSED*/
3795 static int
3796 zfs_symlink(vnode_t *dvp, char *name, vattr_t *vap, char *link, cred_t *cr,
3797 caller_context_t *ct, int flags)
3798 {
3799 znode_t *zp, *dzp = VTOZ(dvp);
3800 zfs_dirlock_t *dl;
3801 dmu_tx_t *tx;
3802 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
3803 zilog_t *zilog;
3804 uint64_t len = strlen(link);
3805 int error;
3806 int zflg = ZNEW;
3807 zfs_acl_ids_t acl_ids;
3808 boolean_t fuid_dirtied;
3809 uint64_t txtype = TX_SYMLINK;
3810 boolean_t waited = B_FALSE;
3811
3812 ASSERT(vap->va_type == VLNK);
3813
3814 ZFS_ENTER(zfsvfs);
3815 ZFS_VERIFY_ZP(dzp);
3816 zilog = zfsvfs->z_log;
3817
3818 if (zfsvfs->z_utf8 && u8_validate(name, strlen(name),
3819 NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
3820 ZFS_EXIT(zfsvfs);
3821 return (SET_ERROR(EILSEQ));
3822 }
3823 if (flags & FIGNORECASE)
3824 zflg |= ZCILOOK;
3825
3826 if (len > MAXPATHLEN) {
3827 ZFS_EXIT(zfsvfs);
3828 return (SET_ERROR(ENAMETOOLONG));
3829 }
3830
3831 if ((error = zfs_acl_ids_create(dzp, 0,
3832 vap, cr, NULL, &acl_ids)) != 0) {
3833 ZFS_EXIT(zfsvfs);
3834 return (error);
3835 }
3836 top:
3837 /*
3838 * Attempt to lock directory; fail if entry already exists.
3839 */
3840 error = zfs_dirent_lock(&dl, dzp, name, &zp, zflg, NULL, NULL);
3841 if (error) {
3842 zfs_acl_ids_free(&acl_ids);
3843 ZFS_EXIT(zfsvfs);
3844 return (error);
3845 }
3846
3847 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) {
3848 zfs_acl_ids_free(&acl_ids);
3849 zfs_dirent_unlock(dl);
3850 ZFS_EXIT(zfsvfs);
3851 return (error);
3852 }
3853
3854 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
3855 zfs_acl_ids_free(&acl_ids);
3856 zfs_dirent_unlock(dl);
3857 ZFS_EXIT(zfsvfs);
3858 return (SET_ERROR(EDQUOT));
3859 }
3860 tx = dmu_tx_create(zfsvfs->z_os);
3861 fuid_dirtied = zfsvfs->z_fuid_dirty;
3862 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, MAX(1, len));
3863 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
3864 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
3865 ZFS_SA_BASE_ATTR_SIZE + len);
3866 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
3867 if (!zfsvfs->z_use_sa && acl_ids.z_aclp->z_acl_bytes > ZFS_ACE_SPACE) {
3868 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
3869 acl_ids.z_aclp->z_acl_bytes);
3870 }
3871 if (fuid_dirtied)
3872 zfs_fuid_txhold(zfsvfs, tx);
3873 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
3874 if (error) {
3875 zfs_dirent_unlock(dl);
3876 if (error == ERESTART) {
3877 waited = B_TRUE;
3878 dmu_tx_wait(tx);
3879 dmu_tx_abort(tx);
3880 goto top;
3881 }
3882 zfs_acl_ids_free(&acl_ids);
3883 dmu_tx_abort(tx);
3884 ZFS_EXIT(zfsvfs);
3885 return (error);
3886 }
3887
3888 /*
3889 * Create a new object for the symlink.
3890 * for version 4 ZPL datsets the symlink will be an SA attribute
3891 */
3892 zfs_mknode(dzp, vap, tx, cr, 0, &zp, &acl_ids);
3893
3894 if (fuid_dirtied)
3895 zfs_fuid_sync(zfsvfs, tx);
3896
3897 mutex_enter(&zp->z_lock);
3898 if (zp->z_is_sa)
3899 error = sa_update(zp->z_sa_hdl, SA_ZPL_SYMLINK(zfsvfs),
3900 link, len, tx);
3901 else
3902 zfs_sa_symlink(zp, link, len, tx);
3903 mutex_exit(&zp->z_lock);
3904
3905 zp->z_size = len;
3906 (void) sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zfsvfs),
3907 &zp->z_size, sizeof (zp->z_size), tx);
3908 /*
3909 * Insert the new object into the directory.
3910 */
3911 (void) zfs_link_create(dl, zp, tx, ZNEW);
3912
3913 if (flags & FIGNORECASE)
3914 txtype |= TX_CI;
3915 zfs_log_symlink(zilog, tx, txtype, dzp, zp, name, link);
3916
3917 zfs_acl_ids_free(&acl_ids);
3918
3919 dmu_tx_commit(tx);
3920
3921 zfs_dirent_unlock(dl);
3922
3923 VN_RELE(ZTOV(zp));
3924
3925 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
3926 zil_commit(zilog, 0);
3927
3928 ZFS_EXIT(zfsvfs);
3929 return (error);
3930 }
3931
3932 /*
3933 * Return, in the buffer contained in the provided uio structure,
3934 * the symbolic path referred to by vp.
3935 *
3936 * IN: vp - vnode of symbolic link.
3937 * uio - structure to contain the link path.
3938 * cr - credentials of caller.
3939 * ct - caller context
3940 *
3941 * OUT: uio - structure containing the link path.
3942 *
3943 * RETURN: 0 on success, error code on failure.
3944 *
3945 * Timestamps:
3946 * vp - atime updated
3947 */
3948 /* ARGSUSED */
3949 static int
3950 zfs_readlink(vnode_t *vp, uio_t *uio, cred_t *cr, caller_context_t *ct)
3951 {
3952 znode_t *zp = VTOZ(vp);
3953 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
3954 int error;
3955
3956 ZFS_ENTER(zfsvfs);
3957 ZFS_VERIFY_ZP(zp);
3958
3959 mutex_enter(&zp->z_lock);
3960 if (zp->z_is_sa)
3961 error = sa_lookup_uio(zp->z_sa_hdl,
3962 SA_ZPL_SYMLINK(zfsvfs), uio);
3963 else
3964 error = zfs_sa_readlink(zp, uio);
3965 mutex_exit(&zp->z_lock);
3966
3967 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
3968
3969 ZFS_EXIT(zfsvfs);
3970 return (error);
3971 }
3972
3973 /*
3974 * Insert a new entry into directory tdvp referencing svp.
3975 *
3976 * IN: tdvp - Directory to contain new entry.
3977 * svp - vnode of new entry.
3978 * name - name of new entry.
3979 * cr - credentials of caller.
3980 * ct - caller context
3981 *
3982 * RETURN: 0 on success, error code on failure.
3983 *
3984 * Timestamps:
3985 * tdvp - ctime|mtime updated
3986 * svp - ctime updated
3987 */
3988 /* ARGSUSED */
3989 static int
3990 zfs_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr,
3991 caller_context_t *ct, int flags)
3992 {
3993 znode_t *dzp = VTOZ(tdvp);
3994 znode_t *tzp, *szp;
3995 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
3996 zilog_t *zilog;
3997 zfs_dirlock_t *dl;
3998 dmu_tx_t *tx;
3999 vnode_t *realvp;
4000 int error;
4001 int zf = ZNEW;
4002 uint64_t parent;
4003 uid_t owner;
4004 boolean_t waited = B_FALSE;
4005
4006 ASSERT(tdvp->v_type == VDIR);
4007
4008 ZFS_ENTER(zfsvfs);
4009 ZFS_VERIFY_ZP(dzp);
4010 zilog = zfsvfs->z_log;
4011
4012 if (VOP_REALVP(svp, &realvp, ct) == 0)
4013 svp = realvp;
4014
4015 /*
4016 * POSIX dictates that we return EPERM here.
4017 * Better choices include ENOTSUP or EISDIR.
4018 */
4019 if (svp->v_type == VDIR) {
4020 ZFS_EXIT(zfsvfs);
4021 return (SET_ERROR(EPERM));
4022 }
4023
4024 szp = VTOZ(svp);
4025 ZFS_VERIFY_ZP(szp);
4026
4027 /*
4028 * We check z_zfsvfs rather than v_vfsp here, because snapshots and the
4029 * ctldir appear to have the same v_vfsp.
4030 */
4031 if (szp->z_zfsvfs != zfsvfs || zfsctl_is_node(svp)) {
4032 ZFS_EXIT(zfsvfs);
4033 return (SET_ERROR(EXDEV));
4034 }
4035
4036 /* Prevent links to .zfs/shares files */
4037
4038 if ((error = sa_lookup(szp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
4039 &parent, sizeof (uint64_t))) != 0) {
4040 ZFS_EXIT(zfsvfs);
4041 return (error);
4042 }
4043 if (parent == zfsvfs->z_shares_dir) {
4044 ZFS_EXIT(zfsvfs);
4045 return (SET_ERROR(EPERM));
4046 }
4047
4048 if (zfsvfs->z_utf8 && u8_validate(name,
4049 strlen(name), NULL, U8_VALIDATE_ENTIRE, &error) < 0) {
4050 ZFS_EXIT(zfsvfs);
4051 return (SET_ERROR(EILSEQ));
4052 }
4053 if (flags & FIGNORECASE)
4054 zf |= ZCILOOK;
4055
4056 /*
4057 * We do not support links between attributes and non-attributes
4058 * because of the potential security risk of creating links
4059 * into "normal" file space in order to circumvent restrictions
4060 * imposed in attribute space.
4061 */
4062 if ((szp->z_pflags & ZFS_XATTR) != (dzp->z_pflags & ZFS_XATTR)) {
4063 ZFS_EXIT(zfsvfs);
4064 return (SET_ERROR(EINVAL));
4065 }
4066
4067
4068 owner = zfs_fuid_map_id(zfsvfs, szp->z_uid, cr, ZFS_OWNER);
4069 if (owner != crgetuid(cr) && secpolicy_basic_link(cr) != 0) {
4070 ZFS_EXIT(zfsvfs);
4071 return (SET_ERROR(EPERM));
4072 }
4073
4074 if (error = zfs_zaccess(dzp, ACE_ADD_FILE, 0, B_FALSE, cr)) {
4075 ZFS_EXIT(zfsvfs);
4076 return (error);
4077 }
4078
4079 top:
4080 /*
4081 * Attempt to lock directory; fail if entry already exists.
4082 */
4083 error = zfs_dirent_lock(&dl, dzp, name, &tzp, zf, NULL, NULL);
4084 if (error) {
4085 ZFS_EXIT(zfsvfs);
4086 return (error);
4087 }
4088
4089 tx = dmu_tx_create(zfsvfs->z_os);
4090 dmu_tx_hold_sa(tx, szp->z_sa_hdl, B_FALSE);
4091 dmu_tx_hold_zap(tx, dzp->z_id, TRUE, name);
4092 zfs_sa_upgrade_txholds(tx, szp);
4093 zfs_sa_upgrade_txholds(tx, dzp);
4094 error = dmu_tx_assign(tx, waited ? TXG_WAITED : TXG_NOWAIT);
4095 if (error) {
4096 zfs_dirent_unlock(dl);
4097 if (error == ERESTART) {
4098 waited = B_TRUE;
4099 dmu_tx_wait(tx);
4100 dmu_tx_abort(tx);
4101 goto top;
4102 }
4103 dmu_tx_abort(tx);
4104 ZFS_EXIT(zfsvfs);
4105 return (error);
4106 }
4107
4108 error = zfs_link_create(dl, szp, tx, 0);
4109
4110 if (error == 0) {
4111 uint64_t txtype = TX_LINK;
4112 if (flags & FIGNORECASE)
4113 txtype |= TX_CI;
4114 zfs_log_link(zilog, tx, txtype, dzp, szp, name);
4115 }
4116
4117 dmu_tx_commit(tx);
4118
4119 zfs_dirent_unlock(dl);
4120
4121 if (error == 0) {
4122 vnevent_link(svp, ct);
4123 }
4124
4125 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4126 zil_commit(zilog, 0);
4127
4128 ZFS_EXIT(zfsvfs);
4129 return (error);
4130 }
4131
4132 /*
4133 * zfs_null_putapage() is used when the file system has been force
4134 * unmounted. It just drops the pages.
4135 */
4136 /* ARGSUSED */
4137 static int
4138 zfs_null_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp,
4139 size_t *lenp, int flags, cred_t *cr)
4140 {
4141 pvn_write_done(pp, B_INVAL|B_FORCE|B_ERROR);
4142 return (0);
4143 }
4144
4145 /*
4146 * Push a page out to disk, klustering if possible.
4147 *
4148 * IN: vp - file to push page to.
4149 * pp - page to push.
4150 * flags - additional flags.
4151 * cr - credentials of caller.
4152 *
4153 * OUT: offp - start of range pushed.
4154 * lenp - len of range pushed.
4155 *
4156 * RETURN: 0 on success, error code on failure.
4157 *
4158 * NOTE: callers must have locked the page to be pushed. On
4159 * exit, the page (and all other pages in the kluster) must be
4160 * unlocked.
4161 */
4162 /* ARGSUSED */
4163 static int
4164 zfs_putapage(vnode_t *vp, page_t *pp, u_offset_t *offp,
4165 size_t *lenp, int flags, cred_t *cr)
4166 {
4167 znode_t *zp = VTOZ(vp);
4168 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4169 dmu_tx_t *tx;
4170 u_offset_t off, koff;
4171 size_t len, klen;
4172 int err;
4173
4174 off = pp->p_offset;
4175 len = PAGESIZE;
4176 /*
4177 * If our blocksize is bigger than the page size, try to kluster
4178 * multiple pages so that we write a full block (thus avoiding
4179 * a read-modify-write).
4180 */
4181 if (off < zp->z_size && zp->z_blksz > PAGESIZE) {
4182 klen = P2ROUNDUP((ulong_t)zp->z_blksz, PAGESIZE);
4183 koff = ISP2(klen) ? P2ALIGN(off, (u_offset_t)klen) : 0;
4184 ASSERT(koff <= zp->z_size);
4185 if (koff + klen > zp->z_size)
4186 klen = P2ROUNDUP(zp->z_size - koff, (uint64_t)PAGESIZE);
4187 pp = pvn_write_kluster(vp, pp, &off, &len, koff, klen, flags);
4188 }
4189 ASSERT3U(btop(len), ==, btopr(len));
4190
4191 /*
4192 * Can't push pages past end-of-file.
4193 */
4194 if (off >= zp->z_size) {
4195 /* ignore all pages */
4196 err = 0;
4197 goto out;
4198 } else if (off + len > zp->z_size) {
4199 int npages = btopr(zp->z_size - off);
4200 page_t *trunc;
4201
4202 page_list_break(&pp, &trunc, npages);
4203 /* ignore pages past end of file */
4204 if (trunc)
4205 pvn_write_done(trunc, flags);
4206 len = zp->z_size - off;
4207 }
4208
4209 if (zfs_owner_overquota(zfsvfs, zp, B_FALSE) ||
4210 zfs_owner_overquota(zfsvfs, zp, B_TRUE)) {
4211 err = SET_ERROR(EDQUOT);
4212 goto out;
4213 }
4214 tx = dmu_tx_create(zfsvfs->z_os);
4215 dmu_tx_hold_write(tx, zp->z_id, off, len);
4216
4217 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4218 zfs_sa_upgrade_txholds(tx, zp);
4219 err = dmu_tx_assign(tx, TXG_WAIT);
4220 if (err != 0) {
4221 dmu_tx_abort(tx);
4222 goto out;
4223 }
4224
4225 if (zp->z_blksz <= PAGESIZE) {
4226 caddr_t va = zfs_map_page(pp, S_READ);
4227 ASSERT3U(len, <=, PAGESIZE);
4228 dmu_write(zfsvfs->z_os, zp->z_id, off, len, va, tx);
4229 zfs_unmap_page(pp, va);
4230 } else {
4231 err = dmu_write_pages(zfsvfs->z_os, zp->z_id, off, len, pp, tx);
4232 }
4233
4234 if (err == 0) {
4235 uint64_t mtime[2], ctime[2];
4236 sa_bulk_attr_t bulk[3];
4237 int count = 0;
4238
4239 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
4240 &mtime, 16);
4241 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
4242 &ctime, 16);
4243 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
4244 &zp->z_pflags, 8);
4245 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
4246 B_TRUE);
4247 zfs_log_write(zfsvfs->z_log, tx, TX_WRITE, zp, off, len, 0);
4248 }
4249 dmu_tx_commit(tx);
4250
4251 out:
4252 pvn_write_done(pp, (err ? B_ERROR : 0) | flags);
4253 if (offp)
4254 *offp = off;
4255 if (lenp)
4256 *lenp = len;
4257
4258 return (err);
4259 }
4260
4261 /*
4262 * Copy the portion of the file indicated from pages into the file.
4263 * The pages are stored in a page list attached to the files vnode.
4264 *
4265 * IN: vp - vnode of file to push page data to.
4266 * off - position in file to put data.
4267 * len - amount of data to write.
4268 * flags - flags to control the operation.
4269 * cr - credentials of caller.
4270 * ct - caller context.
4271 *
4272 * RETURN: 0 on success, error code on failure.
4273 *
4274 * Timestamps:
4275 * vp - ctime|mtime updated
4276 */
4277 /*ARGSUSED*/
4278 static int
4279 zfs_putpage(vnode_t *vp, offset_t off, size_t len, int flags, cred_t *cr,
4280 caller_context_t *ct)
4281 {
4282 znode_t *zp = VTOZ(vp);
4283 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4284 page_t *pp;
4285 size_t io_len;
4286 u_offset_t io_off;
4287 uint_t blksz;
4288 rl_t *rl;
4289 int error = 0;
4290
4291 ZFS_ENTER(zfsvfs);
4292 ZFS_VERIFY_ZP(zp);
4293
4294 /*
4295 * There's nothing to do if no data is cached.
4296 */
4297 if (!vn_has_cached_data(vp)) {
4298 ZFS_EXIT(zfsvfs);
4299 return (0);
4300 }
4301
4302 /*
4303 * Align this request to the file block size in case we kluster.
4304 * XXX - this can result in pretty aggresive locking, which can
4305 * impact simultanious read/write access. One option might be
4306 * to break up long requests (len == 0) into block-by-block
4307 * operations to get narrower locking.
4308 */
4309 blksz = zp->z_blksz;
4310 if (ISP2(blksz))
4311 io_off = P2ALIGN_TYPED(off, blksz, u_offset_t);
4312 else
4313 io_off = 0;
4314 if (len > 0 && ISP2(blksz))
4315 io_len = P2ROUNDUP_TYPED(len + (off - io_off), blksz, size_t);
4316 else
4317 io_len = 0;
4318
4319 if (io_len == 0) {
4320 /*
4321 * Search the entire vp list for pages >= io_off.
4322 */
4323 rl = zfs_range_lock(zp, io_off, UINT64_MAX, RL_WRITER);
4324 error = pvn_vplist_dirty(vp, io_off, zfs_putapage, flags, cr);
4325 goto out;
4326 }
4327 rl = zfs_range_lock(zp, io_off, io_len, RL_WRITER);
4328
4329 if (off > zp->z_size) {
4330 /* past end of file */
4331 zfs_range_unlock(rl);
4332 ZFS_EXIT(zfsvfs);
4333 return (0);
4334 }
4335
4336 len = MIN(io_len, P2ROUNDUP(zp->z_size, PAGESIZE) - io_off);
4337
4338 for (off = io_off; io_off < off + len; io_off += io_len) {
4339 if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) {
4340 pp = page_lookup(vp, io_off,
4341 (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED);
4342 } else {
4343 pp = page_lookup_nowait(vp, io_off,
4344 (flags & B_FREE) ? SE_EXCL : SE_SHARED);
4345 }
4346
4347 if (pp != NULL && pvn_getdirty(pp, flags)) {
4348 int err;
4349
4350 /*
4351 * Found a dirty page to push
4352 */
4353 err = zfs_putapage(vp, pp, &io_off, &io_len, flags, cr);
4354 if (err)
4355 error = err;
4356 } else {
4357 io_len = PAGESIZE;
4358 }
4359 }
4360 out:
4361 zfs_range_unlock(rl);
4362 if ((flags & B_ASYNC) == 0 || zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
4363 zil_commit(zfsvfs->z_log, zp->z_id);
4364 ZFS_EXIT(zfsvfs);
4365 return (error);
4366 }
4367
4368 /*ARGSUSED*/
4369 void
4370 zfs_inactive(vnode_t *vp, cred_t *cr, caller_context_t *ct)
4371 {
4372 znode_t *zp = VTOZ(vp);
4373 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4374 int error;
4375
4376 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_READER);
4377 if (zp->z_sa_hdl == NULL) {
4378 /*
4379 * The fs has been unmounted, or we did a
4380 * suspend/resume and this file no longer exists.
4381 */
4382 if (vn_has_cached_data(vp)) {
4383 (void) pvn_vplist_dirty(vp, 0, zfs_null_putapage,
4384 B_INVAL, cr);
4385 }
4386
4387 mutex_enter(&zp->z_lock);
4388 mutex_enter(&vp->v_lock);
4389 ASSERT(vp->v_count == 1);
4390 vp->v_count = 0;
4391 mutex_exit(&vp->v_lock);
4392 mutex_exit(&zp->z_lock);
4393 rw_exit(&zfsvfs->z_teardown_inactive_lock);
4394 zfs_znode_free(zp);
4395 return;
4396 }
4397
4398 /*
4399 * Attempt to push any data in the page cache. If this fails
4400 * we will get kicked out later in zfs_zinactive().
4401 */
4402 if (vn_has_cached_data(vp)) {
4403 (void) pvn_vplist_dirty(vp, 0, zfs_putapage, B_INVAL|B_ASYNC,
4404 cr);
4405 }
4406
4407 if (zp->z_atime_dirty && zp->z_unlinked == 0) {
4408 dmu_tx_t *tx = dmu_tx_create(zfsvfs->z_os);
4409
4410 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
4411 zfs_sa_upgrade_txholds(tx, zp);
4412 error = dmu_tx_assign(tx, TXG_WAIT);
4413 if (error) {
4414 dmu_tx_abort(tx);
4415 } else {
4416 mutex_enter(&zp->z_lock);
4417 (void) sa_update(zp->z_sa_hdl, SA_ZPL_ATIME(zfsvfs),
4418 (void *)&zp->z_atime, sizeof (zp->z_atime), tx);
4419 zp->z_atime_dirty = 0;
4420 mutex_exit(&zp->z_lock);
4421 dmu_tx_commit(tx);
4422 }
4423 }
4424
4425 zfs_zinactive(zp);
4426 rw_exit(&zfsvfs->z_teardown_inactive_lock);
4427 }
4428
4429 /*
4430 * Bounds-check the seek operation.
4431 *
4432 * IN: vp - vnode seeking within
4433 * ooff - old file offset
4434 * noffp - pointer to new file offset
4435 * ct - caller context
4436 *
4437 * RETURN: 0 on success, EINVAL if new offset invalid.
4438 */
4439 /* ARGSUSED */
4440 static int
4441 zfs_seek(vnode_t *vp, offset_t ooff, offset_t *noffp,
4442 caller_context_t *ct)
4443 {
4444 if (vp->v_type == VDIR)
4445 return (0);
4446 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
4447 }
4448
4449 /*
4450 * Pre-filter the generic locking function to trap attempts to place
4451 * a mandatory lock on a memory mapped file.
4452 */
4453 static int
4454 zfs_frlock(vnode_t *vp, int cmd, flock64_t *bfp, int flag, offset_t offset,
4455 flk_callback_t *flk_cbp, cred_t *cr, caller_context_t *ct)
4456 {
4457 znode_t *zp = VTOZ(vp);
4458 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4459
4460 ZFS_ENTER(zfsvfs);
4461 ZFS_VERIFY_ZP(zp);
4462
4463 /*
4464 * We are following the UFS semantics with respect to mapcnt
4465 * here: If we see that the file is mapped already, then we will
4466 * return an error, but we don't worry about races between this
4467 * function and zfs_map().
4468 */
4469 if (zp->z_mapcnt > 0 && MANDMODE(zp->z_mode)) {
4470 ZFS_EXIT(zfsvfs);
4471 return (SET_ERROR(EAGAIN));
4472 }
4473 ZFS_EXIT(zfsvfs);
4474 return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr, ct));
4475 }
4476
4477 /*
4478 * If we can't find a page in the cache, we will create a new page
4479 * and fill it with file data. For efficiency, we may try to fill
4480 * multiple pages at once (klustering) to fill up the supplied page
4481 * list. Note that the pages to be filled are held with an exclusive
4482 * lock to prevent access by other threads while they are being filled.
4483 */
4484 static int
4485 zfs_fillpage(vnode_t *vp, u_offset_t off, struct seg *seg,
4486 caddr_t addr, page_t *pl[], size_t plsz, enum seg_rw rw)
4487 {
4488 znode_t *zp = VTOZ(vp);
4489 page_t *pp, *cur_pp;
4490 objset_t *os = zp->z_zfsvfs->z_os;
4491 u_offset_t io_off, total;
4492 size_t io_len;
4493 int err;
4494
4495 if (plsz == PAGESIZE || zp->z_blksz <= PAGESIZE) {
4496 /*
4497 * We only have a single page, don't bother klustering
4498 */
4499 io_off = off;
4500 io_len = PAGESIZE;
4501 pp = page_create_va(vp, io_off, io_len,
4502 PG_EXCL | PG_WAIT, seg, addr);
4503 } else {
4504 /*
4505 * Try to find enough pages to fill the page list
4506 */
4507 pp = pvn_read_kluster(vp, off, seg, addr, &io_off,
4508 &io_len, off, plsz, 0);
4509 }
4510 if (pp == NULL) {
4511 /*
4512 * The page already exists, nothing to do here.
4513 */
4514 *pl = NULL;
4515 return (0);
4516 }
4517
4518 /*
4519 * Fill the pages in the kluster.
4520 */
4521 cur_pp = pp;
4522 for (total = io_off + io_len; io_off < total; io_off += PAGESIZE) {
4523 caddr_t va;
4524
4525 ASSERT3U(io_off, ==, cur_pp->p_offset);
4526 va = zfs_map_page(cur_pp, S_WRITE);
4527 err = dmu_read(os, zp->z_id, io_off, PAGESIZE, va,
4528 DMU_READ_PREFETCH);
4529 zfs_unmap_page(cur_pp, va);
4530 if (err) {
4531 /* On error, toss the entire kluster */
4532 pvn_read_done(pp, B_ERROR);
4533 /* convert checksum errors into IO errors */
4534 if (err == ECKSUM)
4535 err = SET_ERROR(EIO);
4536 return (err);
4537 }
4538 cur_pp = cur_pp->p_next;
4539 }
4540
4541 /*
4542 * Fill in the page list array from the kluster starting
4543 * from the desired offset `off'.
4544 * NOTE: the page list will always be null terminated.
4545 */
4546 pvn_plist_init(pp, pl, plsz, off, io_len, rw);
4547 ASSERT(pl == NULL || (*pl)->p_offset == off);
4548
4549 return (0);
4550 }
4551
4552 /*
4553 * Return pointers to the pages for the file region [off, off + len]
4554 * in the pl array. If plsz is greater than len, this function may
4555 * also return page pointers from after the specified region
4556 * (i.e. the region [off, off + plsz]). These additional pages are
4557 * only returned if they are already in the cache, or were created as
4558 * part of a klustered read.
4559 *
4560 * IN: vp - vnode of file to get data from.
4561 * off - position in file to get data from.
4562 * len - amount of data to retrieve.
4563 * plsz - length of provided page list.
4564 * seg - segment to obtain pages for.
4565 * addr - virtual address of fault.
4566 * rw - mode of created pages.
4567 * cr - credentials of caller.
4568 * ct - caller context.
4569 *
4570 * OUT: protp - protection mode of created pages.
4571 * pl - list of pages created.
4572 *
4573 * RETURN: 0 on success, error code on failure.
4574 *
4575 * Timestamps:
4576 * vp - atime updated
4577 */
4578 /* ARGSUSED */
4579 static int
4580 zfs_getpage(vnode_t *vp, offset_t off, size_t len, uint_t *protp,
4581 page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr,
4582 enum seg_rw rw, cred_t *cr, caller_context_t *ct)
4583 {
4584 znode_t *zp = VTOZ(vp);
4585 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4586 page_t **pl0 = pl;
4587 int err = 0;
4588
4589 /* we do our own caching, faultahead is unnecessary */
4590 if (pl == NULL)
4591 return (0);
4592 else if (len > plsz)
4593 len = plsz;
4594 else
4595 len = P2ROUNDUP(len, PAGESIZE);
4596 ASSERT(plsz >= len);
4597
4598 ZFS_ENTER(zfsvfs);
4599 ZFS_VERIFY_ZP(zp);
4600
4601 if (protp)
4602 *protp = PROT_ALL;
4603
4604 /*
4605 * Loop through the requested range [off, off + len) looking
4606 * for pages. If we don't find a page, we will need to create
4607 * a new page and fill it with data from the file.
4608 */
4609 while (len > 0) {
4610 if (*pl = page_lookup(vp, off, SE_SHARED))
4611 *(pl+1) = NULL;
4612 else if (err = zfs_fillpage(vp, off, seg, addr, pl, plsz, rw))
4613 goto out;
4614 while (*pl) {
4615 ASSERT3U((*pl)->p_offset, ==, off);
4616 off += PAGESIZE;
4617 addr += PAGESIZE;
4618 if (len > 0) {
4619 ASSERT3U(len, >=, PAGESIZE);
4620 len -= PAGESIZE;
4621 }
4622 ASSERT3U(plsz, >=, PAGESIZE);
4623 plsz -= PAGESIZE;
4624 pl++;
4625 }
4626 }
4627
4628 /*
4629 * Fill out the page array with any pages already in the cache.
4630 */
4631 while (plsz > 0 &&
4632 (*pl++ = page_lookup_nowait(vp, off, SE_SHARED))) {
4633 off += PAGESIZE;
4634 plsz -= PAGESIZE;
4635 }
4636 out:
4637 if (err) {
4638 /*
4639 * Release any pages we have previously locked.
4640 */
4641 while (pl > pl0)
4642 page_unlock(*--pl);
4643 } else {
4644 ZFS_ACCESSTIME_STAMP(zfsvfs, zp);
4645 }
4646
4647 *pl = NULL;
4648
4649 ZFS_EXIT(zfsvfs);
4650 return (err);
4651 }
4652
4653 /*
4654 * Request a memory map for a section of a file. This code interacts
4655 * with common code and the VM system as follows:
4656 *
4657 * - common code calls mmap(), which ends up in smmap_common()
4658 * - this calls VOP_MAP(), which takes you into (say) zfs
4659 * - zfs_map() calls as_map(), passing segvn_create() as the callback
4660 * - segvn_create() creates the new segment and calls VOP_ADDMAP()
4661 * - zfs_addmap() updates z_mapcnt
4662 */
4663 /*ARGSUSED*/
4664 static int
4665 zfs_map(vnode_t *vp, offset_t off, struct as *as, caddr_t *addrp,
4666 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
4667 caller_context_t *ct)
4668 {
4669 znode_t *zp = VTOZ(vp);
4670 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4671 segvn_crargs_t vn_a;
4672 int error;
4673
4674 ZFS_ENTER(zfsvfs);
4675 ZFS_VERIFY_ZP(zp);
4676
4677 if ((prot & PROT_WRITE) && (zp->z_pflags &
4678 (ZFS_IMMUTABLE | ZFS_READONLY | ZFS_APPENDONLY))) {
4679 ZFS_EXIT(zfsvfs);
4680 return (SET_ERROR(EPERM));
4681 }
4682
4683 if ((prot & (PROT_READ | PROT_EXEC)) &&
4684 (zp->z_pflags & ZFS_AV_QUARANTINED)) {
4685 ZFS_EXIT(zfsvfs);
4686 return (SET_ERROR(EACCES));
4687 }
4688
4689 if (vp->v_flag & VNOMAP) {
4690 ZFS_EXIT(zfsvfs);
4691 return (SET_ERROR(ENOSYS));
4692 }
4693
4694 if (off < 0 || len > MAXOFFSET_T - off) {
4695 ZFS_EXIT(zfsvfs);
4696 return (SET_ERROR(ENXIO));
4697 }
4698
4699 if (vp->v_type != VREG) {
4700 ZFS_EXIT(zfsvfs);
4701 return (SET_ERROR(ENODEV));
4702 }
4703
4704 /*
4705 * If file is locked, disallow mapping.
4706 */
4707 if (MANDMODE(zp->z_mode) && vn_has_flocks(vp)) {
4708 ZFS_EXIT(zfsvfs);
4709 return (SET_ERROR(EAGAIN));
4710 }
4711
4712 as_rangelock(as);
4713 error = choose_addr(as, addrp, len, off, ADDR_VACALIGN, flags);
4714 if (error != 0) {
4715 as_rangeunlock(as);
4716 ZFS_EXIT(zfsvfs);
4717 return (error);
4718 }
4719
4720 vn_a.vp = vp;
4721 vn_a.offset = (u_offset_t)off;
4722 vn_a.type = flags & MAP_TYPE;
4723 vn_a.prot = prot;
4724 vn_a.maxprot = maxprot;
4725 vn_a.cred = cr;
4726 vn_a.amp = NULL;
4727 vn_a.flags = flags & ~MAP_TYPE;
4728 vn_a.szc = 0;
4729 vn_a.lgrp_mem_policy_flags = 0;
4730
4731 error = as_map(as, *addrp, len, segvn_create, &vn_a);
4732
4733 as_rangeunlock(as);
4734 ZFS_EXIT(zfsvfs);
4735 return (error);
4736 }
4737
4738 /* ARGSUSED */
4739 static int
4740 zfs_addmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
4741 size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, cred_t *cr,
4742 caller_context_t *ct)
4743 {
4744 uint64_t pages = btopr(len);
4745
4746 atomic_add_64(&VTOZ(vp)->z_mapcnt, pages);
4747 return (0);
4748 }
4749
4750 /*
4751 * The reason we push dirty pages as part of zfs_delmap() is so that we get a
4752 * more accurate mtime for the associated file. Since we don't have a way of
4753 * detecting when the data was actually modified, we have to resort to
4754 * heuristics. If an explicit msync() is done, then we mark the mtime when the
4755 * last page is pushed. The problem occurs when the msync() call is omitted,
4756 * which by far the most common case:
4757 *
4758 * open()
4759 * mmap()
4760 * <modify memory>
4761 * munmap()
4762 * close()
4763 * <time lapse>
4764 * putpage() via fsflush
4765 *
4766 * If we wait until fsflush to come along, we can have a modification time that
4767 * is some arbitrary point in the future. In order to prevent this in the
4768 * common case, we flush pages whenever a (MAP_SHARED, PROT_WRITE) mapping is
4769 * torn down.
4770 */
4771 /* ARGSUSED */
4772 static int
4773 zfs_delmap(vnode_t *vp, offset_t off, struct as *as, caddr_t addr,
4774 size_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cr,
4775 caller_context_t *ct)
4776 {
4777 uint64_t pages = btopr(len);
4778
4779 ASSERT3U(VTOZ(vp)->z_mapcnt, >=, pages);
4780 atomic_add_64(&VTOZ(vp)->z_mapcnt, -pages);
4781
4782 if ((flags & MAP_SHARED) && (prot & PROT_WRITE) &&
4783 vn_has_cached_data(vp))
4784 (void) VOP_PUTPAGE(vp, off, len, B_ASYNC, cr, ct);
4785
4786 return (0);
4787 }
4788
4789 /*
4790 * Free or allocate space in a file. Currently, this function only
4791 * supports the `F_FREESP' command. However, this command is somewhat
4792 * misnamed, as its functionality includes the ability to allocate as
4793 * well as free space.
4794 *
4795 * IN: vp - vnode of file to free data in.
4796 * cmd - action to take (only F_FREESP supported).
4797 * bfp - section of file to free/alloc.
4798 * flag - current file open mode flags.
4799 * offset - current file offset.
4800 * cr - credentials of caller [UNUSED].
4801 * ct - caller context.
4802 *
4803 * RETURN: 0 on success, error code on failure.
4804 *
4805 * Timestamps:
4806 * vp - ctime|mtime updated
4807 */
4808 /* ARGSUSED */
4809 static int
4810 zfs_space(vnode_t *vp, int cmd, flock64_t *bfp, int flag,
4811 offset_t offset, cred_t *cr, caller_context_t *ct)
4812 {
4813 znode_t *zp = VTOZ(vp);
4814 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4815 uint64_t off, len;
4816 int error;
4817
4818 ZFS_ENTER(zfsvfs);
4819 ZFS_VERIFY_ZP(zp);
4820
4821 if (cmd != F_FREESP) {
4822 ZFS_EXIT(zfsvfs);
4823 return (SET_ERROR(EINVAL));
4824 }
4825
4826 /*
4827 * In a case vp->v_vfsp != zp->z_zfsvfs->z_vfs (e.g. snapshots) our
4828 * callers might not be able to detect properly that we are read-only,
4829 * so check it explicitly here.
4830 */
4831 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
4832 ZFS_EXIT(zfsvfs);
4833 return (SET_ERROR(EROFS));
4834 }
4835
4836 if (error = convoff(vp, bfp, 0, offset)) {
4837 ZFS_EXIT(zfsvfs);
4838 return (error);
4839 }
4840
4841 if (bfp->l_len < 0) {
4842 ZFS_EXIT(zfsvfs);
4843 return (SET_ERROR(EINVAL));
4844 }
4845
4846 off = bfp->l_start;
4847 len = bfp->l_len; /* 0 means from off to end of file */
4848
4849 error = zfs_freesp(zp, off, len, flag, TRUE);
4850
4851 if (error == 0 && off == 0 && len == 0)
4852 vnevent_truncate(ZTOV(zp), ct);
4853
4854 ZFS_EXIT(zfsvfs);
4855 return (error);
4856 }
4857
4858 /*ARGSUSED*/
4859 static int
4860 zfs_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
4861 {
4862 znode_t *zp = VTOZ(vp);
4863 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4864 uint32_t gen;
4865 uint64_t gen64;
4866 uint64_t object = zp->z_id;
4867 zfid_short_t *zfid;
4868 int size, i, error;
4869
4870 ZFS_ENTER(zfsvfs);
4871 ZFS_VERIFY_ZP(zp);
4872
4873 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs),
4874 &gen64, sizeof (uint64_t))) != 0) {
4875 ZFS_EXIT(zfsvfs);
4876 return (error);
4877 }
4878
4879 gen = (uint32_t)gen64;
4880
4881 size = (zfsvfs->z_parent != zfsvfs) ? LONG_FID_LEN : SHORT_FID_LEN;
4882 if (fidp->fid_len < size) {
4883 fidp->fid_len = size;
4884 ZFS_EXIT(zfsvfs);
4885 return (SET_ERROR(ENOSPC));
4886 }
4887
4888 zfid = (zfid_short_t *)fidp;
4889
4890 zfid->zf_len = size;
4891
4892 for (i = 0; i < sizeof (zfid->zf_object); i++)
4893 zfid->zf_object[i] = (uint8_t)(object >> (8 * i));
4894
4895 /* Must have a non-zero generation number to distinguish from .zfs */
4896 if (gen == 0)
4897 gen = 1;
4898 for (i = 0; i < sizeof (zfid->zf_gen); i++)
4899 zfid->zf_gen[i] = (uint8_t)(gen >> (8 * i));
4900
4901 if (size == LONG_FID_LEN) {
4902 uint64_t objsetid = dmu_objset_id(zfsvfs->z_os);
4903 zfid_long_t *zlfid;
4904
4905 zlfid = (zfid_long_t *)fidp;
4906
4907 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
4908 zlfid->zf_setid[i] = (uint8_t)(objsetid >> (8 * i));
4909
4910 /* XXX - this should be the generation number for the objset */
4911 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
4912 zlfid->zf_setgen[i] = 0;
4913 }
4914
4915 ZFS_EXIT(zfsvfs);
4916 return (0);
4917 }
4918
4919 static int
4920 zfs_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
4921 caller_context_t *ct)
4922 {
4923 znode_t *zp, *xzp;
4924 zfsvfs_t *zfsvfs;
4925 zfs_dirlock_t *dl;
4926 int error;
4927
4928 switch (cmd) {
4929 case _PC_LINK_MAX:
4930 *valp = ULONG_MAX;
4931 return (0);
4932
4933 case _PC_FILESIZEBITS:
4934 *valp = 64;
4935 return (0);
4936
4937 case _PC_XATTR_EXISTS:
4938 zp = VTOZ(vp);
4939 zfsvfs = zp->z_zfsvfs;
4940 ZFS_ENTER(zfsvfs);
4941 ZFS_VERIFY_ZP(zp);
4942 *valp = 0;
4943 error = zfs_dirent_lock(&dl, zp, "", &xzp,
4944 ZXATTR | ZEXISTS | ZSHARED, NULL, NULL);
4945 if (error == 0) {
4946 zfs_dirent_unlock(dl);
4947 if (!zfs_dirempty(xzp))
4948 *valp = 1;
4949 VN_RELE(ZTOV(xzp));
4950 } else if (error == ENOENT) {
4951 /*
4952 * If there aren't extended attributes, it's the
4953 * same as having zero of them.
4954 */
4955 error = 0;
4956 }
4957 ZFS_EXIT(zfsvfs);
4958 return (error);
4959
4960 case _PC_SATTR_ENABLED:
4961 case _PC_SATTR_EXISTS:
4962 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_SYSATTR_VIEWS) &&
4963 (vp->v_type == VREG || vp->v_type == VDIR);
4964 return (0);
4965
4966 case _PC_ACCESS_FILTERING:
4967 *valp = vfs_has_feature(vp->v_vfsp, VFSFT_ACCESS_FILTER) &&
4968 vp->v_type == VDIR;
4969 return (0);
4970
4971 case _PC_ACL_ENABLED:
4972 *valp = _ACL_ACE_ENABLED;
4973 return (0);
4974
4975 case _PC_MIN_HOLE_SIZE:
4976 *valp = (ulong_t)SPA_MINBLOCKSIZE;
4977 return (0);
4978
4979 case _PC_TIMESTAMP_RESOLUTION:
4980 /* nanosecond timestamp resolution */
4981 *valp = 1L;
4982 return (0);
4983
4984 default:
4985 return (fs_pathconf(vp, cmd, valp, cr, ct));
4986 }
4987 }
4988
4989 /*ARGSUSED*/
4990 static int
4991 zfs_getsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr,
4992 caller_context_t *ct)
4993 {
4994 znode_t *zp = VTOZ(vp);
4995 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
4996 int error;
4997 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
4998
4999 ZFS_ENTER(zfsvfs);
5000 ZFS_VERIFY_ZP(zp);
5001 error = zfs_getacl(zp, vsecp, skipaclchk, cr);
5002 ZFS_EXIT(zfsvfs);
5003
5004 return (error);
5005 }
5006
5007 /*ARGSUSED*/
5008 static int
5009 zfs_setsecattr(vnode_t *vp, vsecattr_t *vsecp, int flag, cred_t *cr,
5010 caller_context_t *ct)
5011 {
5012 znode_t *zp = VTOZ(vp);
5013 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
5014 int error;
5015 boolean_t skipaclchk = (flag & ATTR_NOACLCHECK) ? B_TRUE : B_FALSE;
5016 zilog_t *zilog = zfsvfs->z_log;
5017
5018 ZFS_ENTER(zfsvfs);
5019 ZFS_VERIFY_ZP(zp);
5020
5021 error = zfs_setacl(zp, vsecp, skipaclchk, cr);
5022
5023 if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS)
5024 zil_commit(zilog, 0);
5025
5026 ZFS_EXIT(zfsvfs);
5027 return (error);
5028 }
5029
5030 /*
5031 * The smallest read we may consider to loan out an arcbuf.
5032 * This must be a power of 2.
5033 */
5034 int zcr_blksz_min = (1 << 10); /* 1K */
5035 /*
5036 * If set to less than the file block size, allow loaning out of an
5037 * arcbuf for a partial block read. This must be a power of 2.
5038 */
5039 int zcr_blksz_max = (1 << 17); /* 128K */
5040
5041 /*ARGSUSED*/
5042 static int
5043 zfs_reqzcbuf(vnode_t *vp, enum uio_rw ioflag, xuio_t *xuio, cred_t *cr,
5044 caller_context_t *ct)
5045 {
5046 znode_t *zp = VTOZ(vp);
5047 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
5048 int max_blksz = zfsvfs->z_max_blksz;
5049 uio_t *uio = &xuio->xu_uio;
5050 ssize_t size = uio->uio_resid;
5051 offset_t offset = uio->uio_loffset;
5052 int blksz;
5053 int fullblk, i;
5054 arc_buf_t *abuf;
5055 ssize_t maxsize;
5056 int preamble, postamble;
5057
5058 if (xuio->xu_type != UIOTYPE_ZEROCOPY)
5059 return (SET_ERROR(EINVAL));
5060
5061 ZFS_ENTER(zfsvfs);
5062 ZFS_VERIFY_ZP(zp);
5063 switch (ioflag) {
5064 case UIO_WRITE:
5065 /*
5066 * Loan out an arc_buf for write if write size is bigger than
5067 * max_blksz, and the file's block size is also max_blksz.
5068 */
5069 blksz = max_blksz;
5070 if (size < blksz || zp->z_blksz != blksz) {
5071 ZFS_EXIT(zfsvfs);
5072 return (SET_ERROR(EINVAL));
5073 }
5074 /*
5075 * Caller requests buffers for write before knowing where the
5076 * write offset might be (e.g. NFS TCP write).
5077 */
5078 if (offset == -1) {
5079 preamble = 0;
5080 } else {
5081 preamble = P2PHASE(offset, blksz);
5082 if (preamble) {
5083 preamble = blksz - preamble;
5084 size -= preamble;
5085 }
5086 }
5087
5088 postamble = P2PHASE(size, blksz);
5089 size -= postamble;
5090
5091 fullblk = size / blksz;
5092 (void) dmu_xuio_init(xuio,
5093 (preamble != 0) + fullblk + (postamble != 0));
5094 DTRACE_PROBE3(zfs_reqzcbuf_align, int, preamble,
5095 int, postamble, int,
5096 (preamble != 0) + fullblk + (postamble != 0));
5097
5098 /*
5099 * Have to fix iov base/len for partial buffers. They
5100 * currently represent full arc_buf's.
5101 */
5102 if (preamble) {
5103 /* data begins in the middle of the arc_buf */
5104 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5105 blksz);
5106 ASSERT(abuf);
5107 (void) dmu_xuio_add(xuio, abuf,
5108 blksz - preamble, preamble);
5109 }
5110
5111 for (i = 0; i < fullblk; i++) {
5112 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5113 blksz);
5114 ASSERT(abuf);
5115 (void) dmu_xuio_add(xuio, abuf, 0, blksz);
5116 }
5117
5118 if (postamble) {
5119 /* data ends in the middle of the arc_buf */
5120 abuf = dmu_request_arcbuf(sa_get_db(zp->z_sa_hdl),
5121 blksz);
5122 ASSERT(abuf);
5123 (void) dmu_xuio_add(xuio, abuf, 0, postamble);
5124 }
5125 break;
5126 case UIO_READ:
5127 /*
5128 * Loan out an arc_buf for read if the read size is larger than
5129 * the current file block size. Block alignment is not
5130 * considered. Partial arc_buf will be loaned out for read.
5131 */
5132 blksz = zp->z_blksz;
5133 if (blksz < zcr_blksz_min)
5134 blksz = zcr_blksz_min;
5135 if (blksz > zcr_blksz_max)
5136 blksz = zcr_blksz_max;
5137 /* avoid potential complexity of dealing with it */
5138 if (blksz > max_blksz) {
5139 ZFS_EXIT(zfsvfs);
5140 return (SET_ERROR(EINVAL));
5141 }
5142
5143 maxsize = zp->z_size - uio->uio_loffset;
5144 if (size > maxsize)
5145 size = maxsize;
5146
5147 if (size < blksz || vn_has_cached_data(vp)) {
5148 ZFS_EXIT(zfsvfs);
5149 return (SET_ERROR(EINVAL));
5150 }
5151 break;
5152 default:
5153 ZFS_EXIT(zfsvfs);
5154 return (SET_ERROR(EINVAL));
5155 }
5156
5157 uio->uio_extflg = UIO_XUIO;
5158 XUIO_XUZC_RW(xuio) = ioflag;
5159 ZFS_EXIT(zfsvfs);
5160 return (0);
5161 }
5162
5163 /*ARGSUSED*/
5164 static int
5165 zfs_retzcbuf(vnode_t *vp, xuio_t *xuio, cred_t *cr, caller_context_t *ct)
5166 {
5167 int i;
5168 arc_buf_t *abuf;
5169 int ioflag = XUIO_XUZC_RW(xuio);
5170
5171 ASSERT(xuio->xu_type == UIOTYPE_ZEROCOPY);
5172
5173 i = dmu_xuio_cnt(xuio);
5174 while (i-- > 0) {
5175 abuf = dmu_xuio_arcbuf(xuio, i);
5176 /*
5177 * if abuf == NULL, it must be a write buffer
5178 * that has been returned in zfs_write().
5179 */
5180 if (abuf)
5181 dmu_return_arcbuf(abuf);
5182 ASSERT(abuf || ioflag == UIO_WRITE);
5183 }
5184
5185 dmu_xuio_fini(xuio);
5186 return (0);
5187 }
5188
5189 /*
5190 * Predeclare these here so that the compiler assumes that
5191 * this is an "old style" function declaration that does
5192 * not include arguments => we won't get type mismatch errors
5193 * in the initializations that follow.
5194 */
5195 static int zfs_inval();
5196 static int zfs_isdir();
5197
5198 static int
5199 zfs_inval()
5200 {
5201 return (SET_ERROR(EINVAL));
5202 }
5203
5204 static int
5205 zfs_isdir()
5206 {
5207 return (SET_ERROR(EISDIR));
5208 }
5209 /*
5210 * Directory vnode operations template
5211 */
5212 vnodeops_t *zfs_dvnodeops;
5213 const fs_operation_def_t zfs_dvnodeops_template[] = {
5214 VOPNAME_OPEN, { .vop_open = zfs_open },
5215 VOPNAME_CLOSE, { .vop_close = zfs_close },
5216 VOPNAME_READ, { .error = zfs_isdir },
5217 VOPNAME_WRITE, { .error = zfs_isdir },
5218 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
5219 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5220 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5221 VOPNAME_ACCESS, { .vop_access = zfs_access },
5222 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
5223 VOPNAME_CREATE, { .vop_create = zfs_create },
5224 VOPNAME_REMOVE, { .vop_remove = zfs_remove },
5225 VOPNAME_LINK, { .vop_link = zfs_link },
5226 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5227 VOPNAME_MKDIR, { .vop_mkdir = zfs_mkdir },
5228 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir },
5229 VOPNAME_READDIR, { .vop_readdir = zfs_readdir },
5230 VOPNAME_SYMLINK, { .vop_symlink = zfs_symlink },
5231 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
5232 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5233 VOPNAME_FID, { .vop_fid = zfs_fid },
5234 VOPNAME_SEEK, { .vop_seek = zfs_seek },
5235 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5236 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5237 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5238 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5239 NULL, NULL
5240 };
5241
5242 /*
5243 * Regular file vnode operations template
5244 */
5245 vnodeops_t *zfs_fvnodeops;
5246 const fs_operation_def_t zfs_fvnodeops_template[] = {
5247 VOPNAME_OPEN, { .vop_open = zfs_open },
5248 VOPNAME_CLOSE, { .vop_close = zfs_close },
5249 VOPNAME_READ, { .vop_read = zfs_read },
5250 VOPNAME_WRITE, { .vop_write = zfs_write },
5251 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
5252 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5253 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5254 VOPNAME_ACCESS, { .vop_access = zfs_access },
5255 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
5256 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5257 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
5258 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5259 VOPNAME_FID, { .vop_fid = zfs_fid },
5260 VOPNAME_SEEK, { .vop_seek = zfs_seek },
5261 VOPNAME_FRLOCK, { .vop_frlock = zfs_frlock },
5262 VOPNAME_SPACE, { .vop_space = zfs_space },
5263 VOPNAME_GETPAGE, { .vop_getpage = zfs_getpage },
5264 VOPNAME_PUTPAGE, { .vop_putpage = zfs_putpage },
5265 VOPNAME_MAP, { .vop_map = zfs_map },
5266 VOPNAME_ADDMAP, { .vop_addmap = zfs_addmap },
5267 VOPNAME_DELMAP, { .vop_delmap = zfs_delmap },
5268 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5269 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5270 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5271 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5272 VOPNAME_REQZCBUF, { .vop_reqzcbuf = zfs_reqzcbuf },
5273 VOPNAME_RETZCBUF, { .vop_retzcbuf = zfs_retzcbuf },
5274 NULL, NULL
5275 };
5276
5277 /*
5278 * Symbolic link vnode operations template
5279 */
5280 vnodeops_t *zfs_symvnodeops;
5281 const fs_operation_def_t zfs_symvnodeops_template[] = {
5282 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5283 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5284 VOPNAME_ACCESS, { .vop_access = zfs_access },
5285 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5286 VOPNAME_READLINK, { .vop_readlink = zfs_readlink },
5287 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5288 VOPNAME_FID, { .vop_fid = zfs_fid },
5289 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5290 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5291 NULL, NULL
5292 };
5293
5294 /*
5295 * special share hidden files vnode operations template
5296 */
5297 vnodeops_t *zfs_sharevnodeops;
5298 const fs_operation_def_t zfs_sharevnodeops_template[] = {
5299 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5300 VOPNAME_ACCESS, { .vop_access = zfs_access },
5301 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5302 VOPNAME_FID, { .vop_fid = zfs_fid },
5303 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5304 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5305 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5306 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5307 NULL, NULL
5308 };
5309
5310 /*
5311 * Extended attribute directory vnode operations template
5312 *
5313 * This template is identical to the directory vnodes
5314 * operation template except for restricted operations:
5315 * VOP_MKDIR()
5316 * VOP_SYMLINK()
5317 *
5318 * Note that there are other restrictions embedded in:
5319 * zfs_create() - restrict type to VREG
5320 * zfs_link() - no links into/out of attribute space
5321 * zfs_rename() - no moves into/out of attribute space
5322 */
5323 vnodeops_t *zfs_xdvnodeops;
5324 const fs_operation_def_t zfs_xdvnodeops_template[] = {
5325 VOPNAME_OPEN, { .vop_open = zfs_open },
5326 VOPNAME_CLOSE, { .vop_close = zfs_close },
5327 VOPNAME_IOCTL, { .vop_ioctl = zfs_ioctl },
5328 VOPNAME_GETATTR, { .vop_getattr = zfs_getattr },
5329 VOPNAME_SETATTR, { .vop_setattr = zfs_setattr },
5330 VOPNAME_ACCESS, { .vop_access = zfs_access },
5331 VOPNAME_LOOKUP, { .vop_lookup = zfs_lookup },
5332 VOPNAME_CREATE, { .vop_create = zfs_create },
5333 VOPNAME_REMOVE, { .vop_remove = zfs_remove },
5334 VOPNAME_LINK, { .vop_link = zfs_link },
5335 VOPNAME_RENAME, { .vop_rename = zfs_rename },
5336 VOPNAME_MKDIR, { .error = zfs_inval },
5337 VOPNAME_RMDIR, { .vop_rmdir = zfs_rmdir },
5338 VOPNAME_READDIR, { .vop_readdir = zfs_readdir },
5339 VOPNAME_SYMLINK, { .error = zfs_inval },
5340 VOPNAME_FSYNC, { .vop_fsync = zfs_fsync },
5341 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5342 VOPNAME_FID, { .vop_fid = zfs_fid },
5343 VOPNAME_SEEK, { .vop_seek = zfs_seek },
5344 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5345 VOPNAME_GETSECATTR, { .vop_getsecattr = zfs_getsecattr },
5346 VOPNAME_SETSECATTR, { .vop_setsecattr = zfs_setsecattr },
5347 VOPNAME_VNEVENT, { .vop_vnevent = fs_vnevent_support },
5348 NULL, NULL
5349 };
5350
5351 /*
5352 * Error vnode operations template
5353 */
5354 vnodeops_t *zfs_evnodeops;
5355 const fs_operation_def_t zfs_evnodeops_template[] = {
5356 VOPNAME_INACTIVE, { .vop_inactive = zfs_inactive },
5357 VOPNAME_PATHCONF, { .vop_pathconf = zfs_pathconf },
5358 NULL, NULL
5359 };