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.
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.
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]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
25 #include <sys/types.h>
26 #include <sys/param.h>
28 #include <sys/systm.h>
29 #include <sys/sysmacros.h>
30 #include <sys/resource.h>
32 #include <sys/vnode.h>
37 #include <sys/pathname.h>
38 #include <sys/cmn_err.h>
39 #include <sys/errno.h>
41 #include <sys/unistd.h>
42 #include <sys/sunddi.h>
43 #include <sys/random.h>
44 #include <sys/policy.h>
45 #include <sys/zfs_dir.h>
46 #include <sys/zfs_acl.h>
47 #include <sys/fs/zfs.h>
48 #include "fs/fs_subr.h"
51 #include <sys/atomic.h>
52 #include <sys/zfs_ctldir.h>
53 #include <sys/zfs_fuid.h>
55 #include <sys/zfs_sa.h>
57 #include <sys/extdirent.h>
60 * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups
61 * of names after deciding which is the appropriate lookup interface.
64 zfs_match_find(zfsvfs_t
*zfsvfs
, znode_t
*dzp
, char *name
, boolean_t exact
,
65 boolean_t update
, int *deflags
, pathname_t
*rpnp
, uint64_t *zoid
)
70 matchtype_t mt
= MT_FIRST
;
71 boolean_t conflict
= B_FALSE
;
77 bufsz
= rpnp
->pn_bufsize
;
82 * In the non-mixed case we only expect there would ever
83 * be one match, but we need to use the normalizing lookup.
85 error
= zap_lookup_norm(zfsvfs
->z_os
, dzp
->z_id
, name
, 8, 1,
86 zoid
, mt
, buf
, bufsz
, &conflict
);
87 if (!error
&& deflags
)
88 *deflags
= conflict
? ED_CASE_CONFLICT
: 0;
90 error
= zap_lookup(zfsvfs
->z_os
, dzp
->z_id
, name
, 8, 1, zoid
);
92 *zoid
= ZFS_DIRENT_OBJ(*zoid
);
94 if (error
== ENOENT
&& update
)
95 dnlc_update(ZTOV(dzp
), name
, DNLC_NO_VNODE
);
101 * Lock a directory entry. A dirlock on <dzp, name> protects that name
102 * in dzp's directory zap object. As long as you hold a dirlock, you can
103 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
104 * can change the zap entry for (i.e. link or unlink) this name.
107 * dzp - znode for directory
108 * name - name of entry to lock
109 * flag - ZNEW: if the entry already exists, fail with EEXIST.
110 * ZEXISTS: if the entry does not exist, fail with ENOENT.
111 * ZSHARED: allow concurrent access with other ZSHARED callers.
112 * ZXATTR: we want dzp's xattr directory
113 * ZCILOOK: On a mixed sensitivity file system,
114 * this lookup should be case-insensitive.
115 * ZCIEXACT: On a purely case-insensitive file system,
116 * this lookup should be case-sensitive.
117 * ZRENAMING: we are locking for renaming, force narrow locks
118 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
119 * current thread already holds it.
122 * zpp - pointer to the znode for the entry (NULL if there isn't one)
123 * dlpp - pointer to the dirlock for this entry (NULL on error)
124 * direntflags - (case-insensitive lookup only)
125 * flags if multiple case-sensitive matches exist in directory
126 * realpnp - (case-insensitive lookup only)
127 * actual name matched within the directory
129 * Return value: 0 on success or errno on failure.
131 * NOTE: Always checks for, and rejects, '.' and '..'.
132 * NOTE: For case-insensitive file systems we take wide locks (see below),
133 * but return znode pointers to a single match.
136 zfs_dirent_lock(zfs_dirlock_t
**dlpp
, znode_t
*dzp
, char *name
, znode_t
**zpp
,
137 int flag
, int *direntflags
, pathname_t
*realpnp
)
139 zfsvfs_t
*zfsvfs
= dzp
->z_zfsvfs
;
152 * Verify that we are not trying to lock '.', '..', or '.zfs'
154 if (name
[0] == '.' &&
155 (name
[1] == '\0' || (name
[1] == '.' && name
[2] == '\0')) ||
156 zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0)
160 * Case sensitivity and normalization preferences are set when
161 * the file system is created. These are stored in the
162 * zfsvfs->z_case and zfsvfs->z_norm fields. These choices
163 * affect what vnodes can be cached in the DNLC, how we
164 * perform zap lookups, and the "width" of our dirlocks.
166 * A normal dirlock locks a single name. Note that with
167 * normalization a name can be composed multiple ways, but
168 * when normalized, these names all compare equal. A wide
169 * dirlock locks multiple names. We need these when the file
170 * system is supporting mixed-mode access. It is sometimes
171 * necessary to lock all case permutations of file name at
172 * once so that simultaneous case-insensitive/case-sensitive
173 * behaves as rationally as possible.
177 * Decide if exact matches should be requested when performing
178 * a zap lookup on file systems supporting case-insensitive
182 ((zfsvfs
->z_case
== ZFS_CASE_INSENSITIVE
) && (flag
& ZCIEXACT
)) ||
183 ((zfsvfs
->z_case
== ZFS_CASE_MIXED
) && !(flag
& ZCILOOK
));
186 * Only look in or update the DNLC if we are looking for the
187 * name on a file system that does not require normalization
188 * or case folding. We can also look there if we happen to be
189 * on a non-normalizing, mixed sensitivity file system IF we
190 * are looking for the exact name.
192 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
193 * case for performance improvement?
195 update
= !zfsvfs
->z_norm
||
196 ((zfsvfs
->z_case
== ZFS_CASE_MIXED
) &&
197 !(zfsvfs
->z_norm
& ~U8_TEXTPREP_TOUPPER
) && !(flag
& ZCILOOK
));
200 * ZRENAMING indicates we are in a situation where we should
201 * take narrow locks regardless of the file system's
202 * preferences for normalizing and case folding. This will
203 * prevent us deadlocking trying to grab the same wide lock
204 * twice if the two names happen to be case-insensitive
207 if (flag
& ZRENAMING
)
210 cmpflags
= zfsvfs
->z_norm
;
213 * Wait until there are no locks on this name.
215 * Don't grab the the lock if it is already held. However, cannot
216 * have both ZSHARED and ZHAVELOCK together.
218 ASSERT(!(flag
& ZSHARED
) || !(flag
& ZHAVELOCK
));
219 if (!(flag
& ZHAVELOCK
))
220 rw_enter(&dzp
->z_name_lock
, RW_READER
);
222 mutex_enter(&dzp
->z_lock
);
224 if (dzp
->z_unlinked
) {
225 mutex_exit(&dzp
->z_lock
);
226 if (!(flag
& ZHAVELOCK
))
227 rw_exit(&dzp
->z_name_lock
);
230 for (dl
= dzp
->z_dirlocks
; dl
!= NULL
; dl
= dl
->dl_next
) {
231 if ((u8_strcmp(name
, dl
->dl_name
, 0, cmpflags
,
232 U8_UNICODE_LATEST
, &error
) == 0) || error
!= 0)
236 mutex_exit(&dzp
->z_lock
);
237 if (!(flag
& ZHAVELOCK
))
238 rw_exit(&dzp
->z_name_lock
);
243 * Allocate a new dirlock and add it to the list.
245 dl
= kmem_alloc(sizeof (zfs_dirlock_t
), KM_SLEEP
);
246 cv_init(&dl
->dl_cv
, NULL
, CV_DEFAULT
, NULL
);
252 dl
->dl_next
= dzp
->z_dirlocks
;
253 dzp
->z_dirlocks
= dl
;
256 if ((flag
& ZSHARED
) && dl
->dl_sharecnt
!= 0)
258 cv_wait(&dl
->dl_cv
, &dzp
->z_lock
);
262 * If the z_name_lock was NOT held for this dirlock record it.
264 if (flag
& ZHAVELOCK
)
267 if ((flag
& ZSHARED
) && ++dl
->dl_sharecnt
> 1 && dl
->dl_namesize
== 0) {
269 * We're the second shared reference to dl. Make a copy of
270 * dl_name in case the first thread goes away before we do.
271 * Note that we initialize the new name before storing its
272 * pointer into dl_name, because the first thread may load
273 * dl->dl_name at any time. He'll either see the old value,
274 * which is his, or the new shared copy; either is OK.
276 dl
->dl_namesize
= strlen(dl
->dl_name
) + 1;
277 name
= kmem_alloc(dl
->dl_namesize
, KM_SLEEP
);
278 bcopy(dl
->dl_name
, name
, dl
->dl_namesize
);
282 mutex_exit(&dzp
->z_lock
);
285 * We have a dirlock on the name. (Note that it is the dirlock,
286 * not the dzp's z_lock, that protects the name in the zap object.)
287 * See if there's an object by this name; if so, put a hold on it.
290 error
= sa_lookup(dzp
->z_sa_hdl
, SA_ZPL_XATTR(zfsvfs
), &zoid
,
293 error
= (zoid
== 0 ? ENOENT
: 0);
296 vp
= dnlc_lookup(ZTOV(dzp
), name
);
297 if (vp
== DNLC_NO_VNODE
) {
302 zfs_dirent_unlock(dl
);
310 error
= zfs_match_find(zfsvfs
, dzp
, name
, exact
,
311 update
, direntflags
, realpnp
, &zoid
);
315 if (error
!= ENOENT
|| (flag
& ZEXISTS
)) {
316 zfs_dirent_unlock(dl
);
321 zfs_dirent_unlock(dl
);
324 error
= zfs_zget(zfsvfs
, zoid
, zpp
);
326 zfs_dirent_unlock(dl
);
329 if (!(flag
& ZXATTR
) && update
)
330 dnlc_update(ZTOV(dzp
), name
, ZTOV(*zpp
));
339 * Unlock this directory entry and wake anyone who was waiting for it.
342 zfs_dirent_unlock(zfs_dirlock_t
*dl
)
344 znode_t
*dzp
= dl
->dl_dzp
;
345 zfs_dirlock_t
**prev_dl
, *cur_dl
;
347 mutex_enter(&dzp
->z_lock
);
349 if (!dl
->dl_namelock
)
350 rw_exit(&dzp
->z_name_lock
);
352 if (dl
->dl_sharecnt
> 1) {
354 mutex_exit(&dzp
->z_lock
);
357 prev_dl
= &dzp
->z_dirlocks
;
358 while ((cur_dl
= *prev_dl
) != dl
)
359 prev_dl
= &cur_dl
->dl_next
;
360 *prev_dl
= dl
->dl_next
;
361 cv_broadcast(&dl
->dl_cv
);
362 mutex_exit(&dzp
->z_lock
);
364 if (dl
->dl_namesize
!= 0)
365 kmem_free(dl
->dl_name
, dl
->dl_namesize
);
366 cv_destroy(&dl
->dl_cv
);
367 kmem_free(dl
, sizeof (*dl
));
371 * Look up an entry in a directory.
373 * NOTE: '.' and '..' are handled as special cases because
374 * no directory entries are actually stored for them. If this is
375 * the root of a filesystem, then '.zfs' is also treated as a
376 * special pseudo-directory.
379 zfs_dirlook(znode_t
*dzp
, char *name
, vnode_t
**vpp
, int flags
,
380 int *deflg
, pathname_t
*rpnp
)
387 if (name
[0] == 0 || (name
[0] == '.' && name
[1] == 0)) {
390 } else if (name
[0] == '.' && name
[1] == '.' && name
[2] == 0) {
391 zfsvfs_t
*zfsvfs
= dzp
->z_zfsvfs
;
394 * If we are a snapshot mounted under .zfs, return
395 * the vp for the snapshot directory.
397 if ((error
= sa_lookup(dzp
->z_sa_hdl
,
398 SA_ZPL_PARENT(zfsvfs
), &parent
, sizeof (parent
))) != 0)
400 if (parent
== dzp
->z_id
&& zfsvfs
->z_parent
!= zfsvfs
) {
401 error
= zfsctl_root_lookup(zfsvfs
->z_parent
->z_ctldir
,
402 "snapshot", vpp
, NULL
, 0, NULL
, kcred
,
406 rw_enter(&dzp
->z_parent_lock
, RW_READER
);
407 error
= zfs_zget(zfsvfs
, parent
, &zp
);
410 rw_exit(&dzp
->z_parent_lock
);
411 } else if (zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0) {
412 *vpp
= zfsctl_root(dzp
);
416 zf
= ZEXISTS
| ZSHARED
;
417 if (flags
& FIGNORECASE
)
420 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zf
, deflg
, rpnp
);
423 zfs_dirent_unlock(dl
);
424 dzp
->z_zn_prefetch
= B_TRUE
; /* enable prefetching */
429 if ((flags
& FIGNORECASE
) && rpnp
&& !error
)
430 (void) strlcpy(rpnp
->pn_buf
, name
, rpnp
->pn_bufsize
);
436 * unlinked Set (formerly known as the "delete queue") Error Handling
438 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
439 * don't specify the name of the entry that we will be manipulating. We
440 * also fib and say that we won't be adding any new entries to the
441 * unlinked set, even though we might (this is to lower the minimum file
442 * size that can be deleted in a full filesystem). So on the small
443 * chance that the nlink list is using a fat zap (ie. has more than
444 * 2000 entries), we *may* not pre-read a block that's needed.
445 * Therefore it is remotely possible for some of the assertions
446 * regarding the unlinked set below to fail due to i/o error. On a
447 * nondebug system, this will result in the space being leaked.
450 zfs_unlinked_add(znode_t
*zp
, dmu_tx_t
*tx
)
452 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
454 ASSERT(zp
->z_unlinked
);
455 ASSERT(zp
->z_links
== 0);
458 zap_add_int(zfsvfs
->z_os
, zfsvfs
->z_unlinkedobj
, zp
->z_id
, tx
));
462 * Clean up any znodes that had no links when we either crashed or
463 * (force) umounted the file system.
466 zfs_unlinked_drain(zfsvfs_t
*zfsvfs
)
470 dmu_object_info_t doi
;
475 * Interate over the contents of the unlinked set.
477 for (zap_cursor_init(&zc
, zfsvfs
->z_os
, zfsvfs
->z_unlinkedobj
);
478 zap_cursor_retrieve(&zc
, &zap
) == 0;
479 zap_cursor_advance(&zc
)) {
482 * See what kind of object we have in list
485 error
= dmu_object_info(zfsvfs
->z_os
,
486 zap
.za_first_integer
, &doi
);
490 ASSERT((doi
.doi_type
== DMU_OT_PLAIN_FILE_CONTENTS
) ||
491 (doi
.doi_type
== DMU_OT_DIRECTORY_CONTENTS
));
493 * We need to re-mark these list entries for deletion,
494 * so we pull them back into core and set zp->z_unlinked.
496 error
= zfs_zget(zfsvfs
, zap
.za_first_integer
, &zp
);
499 * We may pick up znodes that are already marked for deletion.
500 * This could happen during the purge of an extended attribute
501 * directory. All we need to do is skip over them, since they
502 * are already in the system marked z_unlinked.
507 zp
->z_unlinked
= B_TRUE
;
510 zap_cursor_fini(&zc
);
514 * Delete the entire contents of a directory. Return a count
515 * of the number of entries that could not be deleted. If we encounter
516 * an error, return a count of at least one so that the directory stays
517 * in the unlinked set.
519 * NOTE: this function assumes that the directory is inactive,
520 * so there is no need to lock its entries before deletion.
521 * Also, it assumes the directory contents is *only* regular
525 zfs_purgedir(znode_t
*dzp
)
531 zfsvfs_t
*zfsvfs
= dzp
->z_zfsvfs
;
536 for (zap_cursor_init(&zc
, zfsvfs
->z_os
, dzp
->z_id
);
537 (error
= zap_cursor_retrieve(&zc
, &zap
)) == 0;
538 zap_cursor_advance(&zc
)) {
539 error
= zfs_zget(zfsvfs
,
540 ZFS_DIRENT_OBJ(zap
.za_first_integer
), &xzp
);
546 ASSERT((ZTOV(xzp
)->v_type
== VREG
) ||
547 (ZTOV(xzp
)->v_type
== VLNK
));
549 tx
= dmu_tx_create(zfsvfs
->z_os
);
550 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
551 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, zap
.za_name
);
552 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
553 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, FALSE
, NULL
);
554 /* Is this really needed ? */
555 zfs_sa_upgrade_txholds(tx
, xzp
);
556 error
= dmu_tx_assign(tx
, TXG_WAIT
);
563 bzero(&dl
, sizeof (dl
));
565 dl
.dl_name
= zap
.za_name
;
567 error
= zfs_link_destroy(&dl
, xzp
, tx
, 0, NULL
);
574 zap_cursor_fini(&zc
);
581 zfs_rmnode(znode_t
*zp
)
583 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
584 objset_t
*os
= zfsvfs
->z_os
;
591 ASSERT(zp
->z_links
== 0);
592 ASSERT(ZTOV(zp
)->v_count
== 0);
595 * If this is an attribute directory, purge its contents.
597 if (ZTOV(zp
)->v_type
== VDIR
&& (zp
->z_pflags
& ZFS_XATTR
)) {
598 if (zfs_purgedir(zp
) != 0) {
600 * Not enough space to delete some xattrs.
601 * Leave it in the unlinked set.
603 zfs_znode_dmu_fini(zp
);
610 * Free up all the data in the file.
612 error
= dmu_free_long_range(os
, zp
->z_id
, 0, DMU_OBJECT_END
);
615 * Not enough space. Leave the file in the unlinked set.
617 zfs_znode_dmu_fini(zp
);
623 * If the file has extended attributes, we're going to unlink
626 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zfsvfs
),
627 &xattr_obj
, sizeof (xattr_obj
));
628 if (error
== 0 && xattr_obj
) {
629 error
= zfs_zget(zfsvfs
, xattr_obj
, &xzp
);
633 acl_obj
= zfs_external_acl(zp
);
636 * Set up the final transaction.
638 tx
= dmu_tx_create(os
);
639 dmu_tx_hold_free(tx
, zp
->z_id
, 0, DMU_OBJECT_END
);
640 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, FALSE
, NULL
);
642 dmu_tx_hold_zap(tx
, zfsvfs
->z_unlinkedobj
, TRUE
, NULL
);
643 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
646 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
648 zfs_sa_upgrade_txholds(tx
, zp
);
649 error
= dmu_tx_assign(tx
, TXG_WAIT
);
652 * Not enough space to delete the file. Leave it in the
653 * unlinked set, leaking it until the fs is remounted (at
654 * which point we'll call zfs_unlinked_drain() to process it).
657 zfs_znode_dmu_fini(zp
);
664 mutex_enter(&xzp
->z_lock
);
665 xzp
->z_unlinked
= B_TRUE
; /* mark xzp for deletion */
666 xzp
->z_links
= 0; /* no more links to it */
667 VERIFY(0 == sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zfsvfs
),
668 &xzp
->z_links
, sizeof (xzp
->z_links
), tx
));
669 mutex_exit(&xzp
->z_lock
);
670 zfs_unlinked_add(xzp
, tx
);
673 /* Remove this znode from the unlinked set */
675 zap_remove_int(zfsvfs
->z_os
, zfsvfs
->z_unlinkedobj
, zp
->z_id
, tx
));
677 zfs_znode_delete(zp
, tx
);
686 zfs_dirent(znode_t
*zp
, uint64_t mode
)
688 uint64_t de
= zp
->z_id
;
690 if (zp
->z_zfsvfs
->z_version
>= ZPL_VERSION_DIRENT_TYPE
)
691 de
|= IFTODT(mode
) << 60;
696 * Link zp into dl. Can only fail if zp has been unlinked.
699 zfs_link_create(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
)
701 znode_t
*dzp
= dl
->dl_dzp
;
702 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
703 vnode_t
*vp
= ZTOV(zp
);
705 int zp_is_dir
= (vp
->v_type
== VDIR
);
706 sa_bulk_attr_t bulk
[5];
707 uint64_t mtime
[2], ctime
[2];
711 mutex_enter(&zp
->z_lock
);
713 if (!(flag
& ZRENAMING
)) {
714 if (zp
->z_unlinked
) { /* no new links to unlinked zp */
715 ASSERT(!(flag
& (ZNEW
| ZEXISTS
)));
716 mutex_exit(&zp
->z_lock
);
720 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zfsvfs
), NULL
,
721 &zp
->z_links
, sizeof (zp
->z_links
));
724 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_PARENT(zfsvfs
), NULL
,
725 &dzp
->z_id
, sizeof (dzp
->z_id
));
726 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zfsvfs
), NULL
,
727 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
729 if (!(flag
& ZNEW
)) {
730 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
), NULL
,
731 ctime
, sizeof (ctime
));
732 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
,
735 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
738 mutex_exit(&zp
->z_lock
);
740 mutex_enter(&dzp
->z_lock
);
742 dzp
->z_links
+= zp_is_dir
;
744 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zfsvfs
), NULL
,
745 &dzp
->z_size
, sizeof (dzp
->z_size
));
746 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zfsvfs
), NULL
,
747 &dzp
->z_links
, sizeof (dzp
->z_links
));
748 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zfsvfs
), NULL
,
749 mtime
, sizeof (mtime
));
750 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
), NULL
,
751 ctime
, sizeof (ctime
));
752 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zfsvfs
), NULL
,
753 &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
754 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
755 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
757 mutex_exit(&dzp
->z_lock
);
759 value
= zfs_dirent(zp
, zp
->z_mode
);
760 error
= zap_add(zp
->z_zfsvfs
->z_os
, dzp
->z_id
, dl
->dl_name
,
764 dnlc_update(ZTOV(dzp
), dl
->dl_name
, vp
);
770 zfs_dropname(zfs_dirlock_t
*dl
, znode_t
*zp
, znode_t
*dzp
, dmu_tx_t
*tx
,
775 if (zp
->z_zfsvfs
->z_norm
) {
776 if (((zp
->z_zfsvfs
->z_case
== ZFS_CASE_INSENSITIVE
) &&
777 (flag
& ZCIEXACT
)) ||
778 ((zp
->z_zfsvfs
->z_case
== ZFS_CASE_MIXED
) &&
780 error
= zap_remove_norm(zp
->z_zfsvfs
->z_os
,
781 dzp
->z_id
, dl
->dl_name
, MT_EXACT
, tx
);
783 error
= zap_remove_norm(zp
->z_zfsvfs
->z_os
,
784 dzp
->z_id
, dl
->dl_name
, MT_FIRST
, tx
);
786 error
= zap_remove(zp
->z_zfsvfs
->z_os
,
787 dzp
->z_id
, dl
->dl_name
, tx
);
794 * Unlink zp from dl, and mark zp for deletion if this was the last link.
795 * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
796 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
797 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
798 * and it's the caller's job to do it.
801 zfs_link_destroy(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
,
802 boolean_t
*unlinkedp
)
804 znode_t
*dzp
= dl
->dl_dzp
;
805 zfsvfs_t
*zfsvfs
= dzp
->z_zfsvfs
;
806 vnode_t
*vp
= ZTOV(zp
);
807 int zp_is_dir
= (vp
->v_type
== VDIR
);
808 boolean_t unlinked
= B_FALSE
;
809 sa_bulk_attr_t bulk
[5];
810 uint64_t mtime
[2], ctime
[2];
814 dnlc_remove(ZTOV(dzp
), dl
->dl_name
);
816 if (!(flag
& ZRENAMING
)) {
817 if (vn_vfswlock(vp
)) /* prevent new mounts on zp */
820 if (vn_ismntpt(vp
)) { /* don't remove mount point */
825 mutex_enter(&zp
->z_lock
);
827 if (zp_is_dir
&& !zfs_dirempty(zp
)) {
828 mutex_exit(&zp
->z_lock
);
834 * If we get here, we are going to try to remove the object.
835 * First try removing the name from the directory; if that
836 * fails, return the error.
838 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
840 mutex_exit(&zp
->z_lock
);
845 if (zp
->z_links
<= zp_is_dir
) {
846 zfs_panic_recover("zfs: link count on %s is %u, "
847 "should be at least %u",
848 zp
->z_vnode
->v_path
? zp
->z_vnode
->v_path
:
849 "<unknown>", (int)zp
->z_links
,
851 zp
->z_links
= zp_is_dir
+ 1;
853 if (--zp
->z_links
== zp_is_dir
) {
854 zp
->z_unlinked
= B_TRUE
;
858 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
),
859 NULL
, &ctime
, sizeof (ctime
));
860 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zfsvfs
),
861 NULL
, &zp
->z_pflags
, sizeof (zp
->z_pflags
));
862 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
865 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zfsvfs
),
866 NULL
, &zp
->z_links
, sizeof (zp
->z_links
));
867 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
870 mutex_exit(&zp
->z_lock
);
873 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
878 mutex_enter(&dzp
->z_lock
);
879 dzp
->z_size
--; /* one dirent removed */
880 dzp
->z_links
-= zp_is_dir
; /* ".." link from zp */
881 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zfsvfs
),
882 NULL
, &dzp
->z_links
, sizeof (dzp
->z_links
));
883 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zfsvfs
),
884 NULL
, &dzp
->z_size
, sizeof (dzp
->z_size
));
885 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zfsvfs
),
886 NULL
, ctime
, sizeof (ctime
));
887 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zfsvfs
),
888 NULL
, mtime
, sizeof (mtime
));
889 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zfsvfs
),
890 NULL
, &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
891 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
892 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
894 mutex_exit(&dzp
->z_lock
);
896 if (unlinkedp
!= NULL
)
897 *unlinkedp
= unlinked
;
899 zfs_unlinked_add(zp
, tx
);
905 * Indicate whether the directory is empty. Works with or without z_lock
906 * held, but can only be consider a hint in the latter case. Returns true
907 * if only "." and ".." remain and there's no work in progress.
910 zfs_dirempty(znode_t
*dzp
)
912 return (dzp
->z_size
== 2 && dzp
->z_dirlocks
== 0);
916 zfs_make_xattrdir(znode_t
*zp
, vattr_t
*vap
, vnode_t
**xvpp
, cred_t
*cr
)
918 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
922 zfs_acl_ids_t acl_ids
;
923 boolean_t fuid_dirtied
;
928 if (error
= zfs_zaccess(zp
, ACE_WRITE_NAMED_ATTRS
, 0, B_FALSE
, cr
))
931 if ((error
= zfs_acl_ids_create(zp
, IS_XATTR
, vap
, cr
, NULL
,
934 if (zfs_acl_ids_overquota(zfsvfs
, &acl_ids
)) {
935 zfs_acl_ids_free(&acl_ids
);
940 tx
= dmu_tx_create(zfsvfs
->z_os
);
941 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
942 ZFS_SA_BASE_ATTR_SIZE
);
943 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
944 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
945 fuid_dirtied
= zfsvfs
->z_fuid_dirty
;
947 zfs_fuid_txhold(zfsvfs
, tx
);
948 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
950 if (error
== ERESTART
) {
955 zfs_acl_ids_free(&acl_ids
);
959 zfs_mknode(zp
, vap
, tx
, cr
, IS_XATTR
, &xzp
, &acl_ids
);
962 zfs_fuid_sync(zfsvfs
, tx
);
965 error
= sa_lookup(xzp
->z_sa_hdl
, SA_ZPL_PARENT(zfsvfs
),
966 &parent
, sizeof (parent
));
967 ASSERT(error
== 0 && parent
== zp
->z_id
);
970 VERIFY(0 == sa_update(zp
->z_sa_hdl
, SA_ZPL_XATTR(zfsvfs
), &xzp
->z_id
,
971 sizeof (xzp
->z_id
), tx
));
973 (void) zfs_log_create(zfsvfs
->z_log
, tx
, TX_MKXATTR
, zp
,
974 xzp
, "", NULL
, acl_ids
.z_fuidp
, vap
);
976 zfs_acl_ids_free(&acl_ids
);
985 * Return a znode for the extended attribute directory for zp.
986 * ** If the directory does not already exist, it is created **
988 * IN: zp - znode to obtain attribute directory from
989 * cr - credentials of caller
990 * flags - flags from the VOP_LOOKUP call
992 * OUT: xzpp - pointer to extended attribute znode
994 * RETURN: 0 on success
995 * error number on failure
998 zfs_get_xattrdir(znode_t
*zp
, vnode_t
**xvpp
, cred_t
*cr
, int flags
)
1000 zfsvfs_t
*zfsvfs
= zp
->z_zfsvfs
;
1006 error
= zfs_dirent_lock(&dl
, zp
, "", &xzp
, ZXATTR
, NULL
, NULL
);
1012 zfs_dirent_unlock(dl
);
1017 if (!(flags
& CREATE_XATTR_DIR
)) {
1018 zfs_dirent_unlock(dl
);
1022 if (zfsvfs
->z_vfs
->vfs_flag
& VFS_RDONLY
) {
1023 zfs_dirent_unlock(dl
);
1028 * The ability to 'create' files in an attribute
1029 * directory comes from the write_xattr permission on the base file.
1031 * The ability to 'search' an attribute directory requires
1032 * read_xattr permission on the base file.
1034 * Once in a directory the ability to read/write attributes
1035 * is controlled by the permissions on the attribute file.
1037 va
.va_mask
= AT_TYPE
| AT_MODE
| AT_UID
| AT_GID
;
1039 va
.va_mode
= S_IFDIR
| S_ISVTX
| 0777;
1040 zfs_fuid_map_ids(zp
, cr
, &va
.va_uid
, &va
.va_gid
);
1042 error
= zfs_make_xattrdir(zp
, &va
, xvpp
, cr
);
1043 zfs_dirent_unlock(dl
);
1045 if (error
== ERESTART
) {
1046 /* NB: we already did dmu_tx_wait() if necessary */
1054 * Decide whether it is okay to remove within a sticky directory.
1056 * In sticky directories, write access is not sufficient;
1057 * you can remove entries from a directory only if:
1059 * you own the directory,
1060 * you own the entry,
1061 * the entry is a plain file and you have write access,
1062 * or you are privileged (checked in secpolicy...).
1064 * The function returns 0 if remove access is granted.
1067 zfs_sticky_remove_access(znode_t
*zdp
, znode_t
*zp
, cred_t
*cr
)
1072 zfsvfs_t
*zfsvfs
= zdp
->z_zfsvfs
;
1074 if (zdp
->z_zfsvfs
->z_replay
)
1077 if ((zdp
->z_mode
& S_ISVTX
) == 0)
1080 downer
= zfs_fuid_map_id(zfsvfs
, zdp
->z_uid
, cr
, ZFS_OWNER
);
1081 fowner
= zfs_fuid_map_id(zfsvfs
, zp
->z_uid
, cr
, ZFS_OWNER
);
1083 if ((uid
= crgetuid(cr
)) == downer
|| uid
== fowner
||
1084 (ZTOV(zp
)->v_type
== VREG
&&
1085 zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
) == 0))
1088 return (secpolicy_vnode_remove(cr
));