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.
26 #include <sys/types.h>
27 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/sysmacros.h>
31 #include <sys/resource.h>
33 #include <sys/vnode.h>
38 #include <sys/pathname.h>
39 #include <sys/cmn_err.h>
40 #include <sys/errno.h>
42 #include <sys/unistd.h>
43 #include <sys/sunddi.h>
44 #include <sys/random.h>
45 #include <sys/policy.h>
46 #include <sys/zfs_dir.h>
47 #include <sys/zfs_acl.h>
48 #include <sys/fs/zfs.h>
49 #include "fs/fs_subr.h"
52 #include <sys/atomic.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(zfs_sb_t
*zsb
, znode_t
*dzp
, char *name
, boolean_t exact
,
65 boolean_t update
, int *deflags
, pathname_t
*rpnp
, uint64_t *zoid
)
67 boolean_t conflict
= B_FALSE
;
71 matchtype_t mt
= MT_FIRST
;
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(zsb
->z_os
, dzp
->z_id
, name
, 8, 1,
86 zoid
, mt
, buf
, bufsz
, &conflict
);
88 error
= zap_lookup(zsb
->z_os
, dzp
->z_id
, name
, 8, 1, zoid
);
92 * Allow multiple entries provided the first entry is
93 * the object id. Non-zpl consumers may safely make
94 * use of the additional space.
96 * XXX: This should be a feature flag for compatibility
98 if (error
== EOVERFLOW
)
101 if (zsb
->z_norm
&& !error
&& deflags
)
102 *deflags
= conflict
? ED_CASE_CONFLICT
: 0;
104 *zoid
= ZFS_DIRENT_OBJ(*zoid
);
107 if (error
== ENOENT
&& update
)
108 dnlc_update(ZTOI(dzp
), name
, DNLC_NO_VNODE
);
109 #endif /* HAVE_DNLC */
115 * Lock a directory entry. A dirlock on <dzp, name> protects that name
116 * in dzp's directory zap object. As long as you hold a dirlock, you can
117 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
118 * can change the zap entry for (i.e. link or unlink) this name.
121 * dzp - znode for directory
122 * name - name of entry to lock
123 * flag - ZNEW: if the entry already exists, fail with EEXIST.
124 * ZEXISTS: if the entry does not exist, fail with ENOENT.
125 * ZSHARED: allow concurrent access with other ZSHARED callers.
126 * ZXATTR: we want dzp's xattr directory
127 * ZCILOOK: On a mixed sensitivity file system,
128 * this lookup should be case-insensitive.
129 * ZCIEXACT: On a purely case-insensitive file system,
130 * this lookup should be case-sensitive.
131 * ZRENAMING: we are locking for renaming, force narrow locks
132 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
133 * current thread already holds it.
136 * zpp - pointer to the znode for the entry (NULL if there isn't one)
137 * dlpp - pointer to the dirlock for this entry (NULL on error)
138 * direntflags - (case-insensitive lookup only)
139 * flags if multiple case-sensitive matches exist in directory
140 * realpnp - (case-insensitive lookup only)
141 * actual name matched within the directory
143 * Return value: 0 on success or errno on failure.
145 * NOTE: Always checks for, and rejects, '.' and '..'.
146 * NOTE: For case-insensitive file systems we take wide locks (see below),
147 * but return znode pointers to a single match.
150 zfs_dirent_lock(zfs_dirlock_t
**dlpp
, znode_t
*dzp
, char *name
, znode_t
**zpp
,
151 int flag
, int *direntflags
, pathname_t
*realpnp
)
153 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
160 #endif /* HAVE_DNLC */
168 * Verify that we are not trying to lock '.', '..', or '.zfs'
170 if ((name
[0] == '.' &&
171 (name
[1] == '\0' || (name
[1] == '.' && name
[2] == '\0'))) ||
172 (zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0))
176 * Case sensitivity and normalization preferences are set when
177 * the file system is created. These are stored in the
178 * zsb->z_case and zsb->z_norm fields. These choices
179 * affect what vnodes can be cached in the DNLC, how we
180 * perform zap lookups, and the "width" of our dirlocks.
182 * A normal dirlock locks a single name. Note that with
183 * normalization a name can be composed multiple ways, but
184 * when normalized, these names all compare equal. A wide
185 * dirlock locks multiple names. We need these when the file
186 * system is supporting mixed-mode access. It is sometimes
187 * necessary to lock all case permutations of file name at
188 * once so that simultaneous case-insensitive/case-sensitive
189 * behaves as rationally as possible.
193 * Decide if exact matches should be requested when performing
194 * a zap lookup on file systems supporting case-insensitive
198 ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
) && (flag
& ZCIEXACT
)) ||
199 ((zsb
->z_case
== ZFS_CASE_MIXED
) && !(flag
& ZCILOOK
));
202 * Only look in or update the DNLC if we are looking for the
203 * name on a file system that does not require normalization
204 * or case folding. We can also look there if we happen to be
205 * on a non-normalizing, mixed sensitivity file system IF we
206 * are looking for the exact name.
208 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
209 * case for performance improvement?
211 update
= !zsb
->z_norm
||
212 ((zsb
->z_case
== ZFS_CASE_MIXED
) &&
213 !(zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
) && !(flag
& ZCILOOK
));
216 * ZRENAMING indicates we are in a situation where we should
217 * take narrow locks regardless of the file system's
218 * preferences for normalizing and case folding. This will
219 * prevent us deadlocking trying to grab the same wide lock
220 * twice if the two names happen to be case-insensitive
223 if (flag
& ZRENAMING
)
226 cmpflags
= zsb
->z_norm
;
229 * Wait until there are no locks on this name.
231 * Don't grab the the lock if it is already held. However, cannot
232 * have both ZSHARED and ZHAVELOCK together.
234 ASSERT(!(flag
& ZSHARED
) || !(flag
& ZHAVELOCK
));
235 if (!(flag
& ZHAVELOCK
))
236 rw_enter(&dzp
->z_name_lock
, RW_READER
);
238 mutex_enter(&dzp
->z_lock
);
240 if (dzp
->z_unlinked
) {
241 mutex_exit(&dzp
->z_lock
);
242 if (!(flag
& ZHAVELOCK
))
243 rw_exit(&dzp
->z_name_lock
);
246 for (dl
= dzp
->z_dirlocks
; dl
!= NULL
; dl
= dl
->dl_next
) {
247 if ((u8_strcmp(name
, dl
->dl_name
, 0, cmpflags
,
248 U8_UNICODE_LATEST
, &error
) == 0) || error
!= 0)
252 mutex_exit(&dzp
->z_lock
);
253 if (!(flag
& ZHAVELOCK
))
254 rw_exit(&dzp
->z_name_lock
);
259 * Allocate a new dirlock and add it to the list.
261 dl
= kmem_alloc(sizeof (zfs_dirlock_t
), KM_SLEEP
);
262 cv_init(&dl
->dl_cv
, NULL
, CV_DEFAULT
, NULL
);
268 dl
->dl_next
= dzp
->z_dirlocks
;
269 dzp
->z_dirlocks
= dl
;
272 if ((flag
& ZSHARED
) && dl
->dl_sharecnt
!= 0)
274 cv_wait(&dl
->dl_cv
, &dzp
->z_lock
);
278 * If the z_name_lock was NOT held for this dirlock record it.
280 if (flag
& ZHAVELOCK
)
283 if ((flag
& ZSHARED
) && ++dl
->dl_sharecnt
> 1 && dl
->dl_namesize
== 0) {
285 * We're the second shared reference to dl. Make a copy of
286 * dl_name in case the first thread goes away before we do.
287 * Note that we initialize the new name before storing its
288 * pointer into dl_name, because the first thread may load
289 * dl->dl_name at any time. He'll either see the old value,
290 * which is his, or the new shared copy; either is OK.
292 dl
->dl_namesize
= strlen(dl
->dl_name
) + 1;
293 name
= kmem_alloc(dl
->dl_namesize
, KM_SLEEP
);
294 bcopy(dl
->dl_name
, name
, dl
->dl_namesize
);
298 mutex_exit(&dzp
->z_lock
);
301 * We have a dirlock on the name. (Note that it is the dirlock,
302 * not the dzp's z_lock, that protects the name in the zap object.)
303 * See if there's an object by this name; if so, put a hold on it.
306 error
= sa_lookup(dzp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
), &zoid
,
309 error
= (zoid
== 0 ? ENOENT
: 0);
313 vp
= dnlc_lookup(ZTOI(dzp
), name
);
314 if (vp
== DNLC_NO_VNODE
) {
319 zfs_dirent_unlock(dl
);
327 error
= zfs_match_find(zsb
, dzp
, name
, exact
,
328 update
, direntflags
, realpnp
, &zoid
);
331 error
= zfs_match_find(zsb
, dzp
, name
, exact
,
332 update
, direntflags
, realpnp
, &zoid
);
333 #endif /* HAVE_DNLC */
336 if (error
!= ENOENT
|| (flag
& ZEXISTS
)) {
337 zfs_dirent_unlock(dl
);
342 zfs_dirent_unlock(dl
);
345 error
= zfs_zget(zsb
, zoid
, zpp
);
347 zfs_dirent_unlock(dl
);
351 if (!(flag
& ZXATTR
) && update
)
352 dnlc_update(ZTOI(dzp
), name
, ZTOI(*zpp
));
353 #endif /* HAVE_DNLC */
362 * Unlock this directory entry and wake anyone who was waiting for it.
365 zfs_dirent_unlock(zfs_dirlock_t
*dl
)
367 znode_t
*dzp
= dl
->dl_dzp
;
368 zfs_dirlock_t
**prev_dl
, *cur_dl
;
370 mutex_enter(&dzp
->z_lock
);
372 if (!dl
->dl_namelock
)
373 rw_exit(&dzp
->z_name_lock
);
375 if (dl
->dl_sharecnt
> 1) {
377 mutex_exit(&dzp
->z_lock
);
380 prev_dl
= &dzp
->z_dirlocks
;
381 while ((cur_dl
= *prev_dl
) != dl
)
382 prev_dl
= &cur_dl
->dl_next
;
383 *prev_dl
= dl
->dl_next
;
384 cv_broadcast(&dl
->dl_cv
);
385 mutex_exit(&dzp
->z_lock
);
387 if (dl
->dl_namesize
!= 0)
388 kmem_free(dl
->dl_name
, dl
->dl_namesize
);
389 cv_destroy(&dl
->dl_cv
);
390 kmem_free(dl
, sizeof (*dl
));
394 * Look up an entry in a directory.
396 * NOTE: '.' and '..' are handled as special cases because
397 * no directory entries are actually stored for them. If this is
398 * the root of a filesystem, then '.zfs' is also treated as a
399 * special pseudo-directory.
402 zfs_dirlook(znode_t
*dzp
, char *name
, struct inode
**ipp
, int flags
,
403 int *deflg
, pathname_t
*rpnp
)
410 if (name
[0] == 0 || (name
[0] == '.' && name
[1] == 0)) {
413 } else if (name
[0] == '.' && name
[1] == '.' && name
[2] == 0) {
414 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
417 * If we are a snapshot mounted under .zfs, return
418 * the vp for the snapshot directory.
420 if ((error
= sa_lookup(dzp
->z_sa_hdl
,
421 SA_ZPL_PARENT(zsb
), &parent
, sizeof (parent
))) != 0)
424 if (parent
== dzp
->z_id
&& zsb
->z_parent
!= zsb
) {
425 error
= zfsctl_root_lookup(zsb
->z_parent
->z_ctldir
,
426 "snapshot", ipp
, NULL
, 0, NULL
, kcred
,
430 #endif /* HAVE_SNAPSHOT */
431 rw_enter(&dzp
->z_parent_lock
, RW_READER
);
432 error
= zfs_zget(zsb
, parent
, &zp
);
435 rw_exit(&dzp
->z_parent_lock
);
437 } else if (zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0) {
438 *ipp
= zfsctl_root(dzp
);
439 #endif /* HAVE_SNAPSHOT */
443 zf
= ZEXISTS
| ZSHARED
;
444 if (flags
& FIGNORECASE
)
447 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zf
, deflg
, rpnp
);
450 zfs_dirent_unlock(dl
);
451 dzp
->z_zn_prefetch
= B_TRUE
; /* enable prefetching */
456 if ((flags
& FIGNORECASE
) && rpnp
&& !error
)
457 (void) strlcpy(rpnp
->pn_buf
, name
, rpnp
->pn_bufsize
);
463 * unlinked Set (formerly known as the "delete queue") Error Handling
465 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
466 * don't specify the name of the entry that we will be manipulating. We
467 * also fib and say that we won't be adding any new entries to the
468 * unlinked set, even though we might (this is to lower the minimum file
469 * size that can be deleted in a full filesystem). So on the small
470 * chance that the nlink list is using a fat zap (ie. has more than
471 * 2000 entries), we *may* not pre-read a block that's needed.
472 * Therefore it is remotely possible for some of the assertions
473 * regarding the unlinked set below to fail due to i/o error. On a
474 * nondebug system, this will result in the space being leaked.
477 zfs_unlinked_add(znode_t
*zp
, dmu_tx_t
*tx
)
479 zfs_sb_t
*zsb
= ZTOZSB(zp
);
481 ASSERT(zp
->z_unlinked
);
482 ASSERT(zp
->z_links
== 0);
485 zap_add_int(zsb
->z_os
, zsb
->z_unlinkedobj
, zp
->z_id
, tx
));
489 * Delete the entire contents of a directory. Return a count
490 * of the number of entries that could not be deleted. If we encounter
491 * an error, return a count of at least one so that the directory stays
492 * in the unlinked set.
494 * NOTE: this function assumes that the directory is inactive,
495 * so there is no need to lock its entries before deletion.
496 * Also, it assumes the directory contents is *only* regular
500 zfs_purgedir(znode_t
*dzp
)
506 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
511 for (zap_cursor_init(&zc
, zsb
->z_os
, dzp
->z_id
);
512 (error
= zap_cursor_retrieve(&zc
, &zap
)) == 0;
513 zap_cursor_advance(&zc
)) {
514 error
= zfs_zget(zsb
,
515 ZFS_DIRENT_OBJ(zap
.za_first_integer
), &xzp
);
521 ASSERT(S_ISREG(ZTOI(xzp
)->i_mode
)||S_ISLNK(ZTOI(xzp
)->i_mode
));
523 tx
= dmu_tx_create(zsb
->z_os
);
524 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
525 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, zap
.za_name
);
526 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
527 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
528 /* Is this really needed ? */
529 zfs_sa_upgrade_txholds(tx
, xzp
);
530 error
= dmu_tx_assign(tx
, TXG_WAIT
);
537 bzero(&dl
, sizeof (dl
));
539 dl
.dl_name
= zap
.za_name
;
541 error
= zfs_link_destroy(&dl
, xzp
, tx
, 0, NULL
);
548 zap_cursor_fini(&zc
);
555 * Clean up any znodes that had no links when we either crashed or
556 * (force) umounted the file system.
559 zfs_unlinked_drain(zfs_sb_t
*zsb
)
563 dmu_object_info_t doi
;
568 * Interate over the contents of the unlinked set.
570 for (zap_cursor_init(&zc
, zsb
->z_os
, zsb
->z_unlinkedobj
);
571 zap_cursor_retrieve(&zc
, &zap
) == 0;
572 zap_cursor_advance(&zc
)) {
575 * See what kind of object we have in list
578 error
= dmu_object_info(zsb
->z_os
, zap
.za_first_integer
, &doi
);
582 ASSERT((doi
.doi_type
== DMU_OT_PLAIN_FILE_CONTENTS
) ||
583 (doi
.doi_type
== DMU_OT_DIRECTORY_CONTENTS
));
585 * We need to re-mark these list entries for deletion,
586 * so we pull them back into core and set zp->z_unlinked.
588 error
= zfs_zget(zsb
, zap
.za_first_integer
, &zp
);
591 * We may pick up znodes that are already marked for deletion.
592 * This could happen during the purge of an extended attribute
593 * directory. All we need to do is skip over them, since they
594 * are already in the system marked z_unlinked.
599 zp
->z_unlinked
= B_TRUE
;
602 * If this is an attribute directory, purge its contents.
604 if (S_ISDIR(ZTOI(zp
)->i_mode
) && (zp
->z_pflags
& ZFS_XATTR
)) {
606 * We don't need to check the return value of
607 * zfs_purgedir here, because zfs_rmnode will just
608 * return this xattr directory to the unlinked set
609 * until all of its xattrs are gone.
611 (void) zfs_purgedir(zp
);
616 zap_cursor_fini(&zc
);
620 zfs_rmnode(znode_t
*zp
)
622 zfs_sb_t
*zsb
= ZTOZSB(zp
);
623 objset_t
*os
= zsb
->z_os
;
631 ASSERT(zp
->z_links
== 0);
632 ASSERT(atomic_read(&ZTOI(zp
)->i_count
) == 0);
635 * If this is an attribute directory, purge its contents.
637 if (S_ISDIR(ZTOI(zp
)->i_mode
) && (zp
->z_pflags
& ZFS_XATTR
)) {
638 error
= zap_count(os
, zp
->z_id
, &count
);
640 zfs_znode_dmu_fini(zp
);
648 * There are still directory entries in this xattr
649 * directory. Let zfs_unlinked_drain() deal with
650 * them to avoid deadlocking this process in the
651 * zfs_purgedir()->zfs_zget()->ilookup() callpath
652 * on the xattr inode's I_FREEING bit.
654 taskq
= dsl_pool_iput_taskq(dmu_objset_pool(os
));
655 taskq_dispatch(taskq
, (task_func_t
*)
656 zfs_unlinked_drain
, zsb
, TQ_SLEEP
);
658 zfs_znode_dmu_fini(zp
);
664 * Free up all the data in the file.
666 error
= dmu_free_long_range(os
, zp
->z_id
, 0, DMU_OBJECT_END
);
669 * Not enough space. Leave the file in the unlinked set.
671 zfs_znode_dmu_fini(zp
);
676 * If the file has extended attributes, we're going to unlink
679 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
680 &xattr_obj
, sizeof (xattr_obj
));
681 if (error
== 0 && xattr_obj
) {
682 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
686 acl_obj
= zfs_external_acl(zp
);
689 * Set up the final transaction.
691 tx
= dmu_tx_create(os
);
692 dmu_tx_hold_free(tx
, zp
->z_id
, 0, DMU_OBJECT_END
);
693 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
695 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, TRUE
, NULL
);
696 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
699 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
701 zfs_sa_upgrade_txholds(tx
, zp
);
702 error
= dmu_tx_assign(tx
, TXG_WAIT
);
705 * Not enough space to delete the file. Leave it in the
706 * unlinked set, leaking it until the fs is remounted (at
707 * which point we'll call zfs_unlinked_drain() to process it).
710 zfs_znode_dmu_fini(zp
);
716 mutex_enter(&xzp
->z_lock
);
717 xzp
->z_unlinked
= B_TRUE
; /* mark xzp for deletion */
718 xzp
->z_links
= 0; /* no more links to it */
719 VERIFY(0 == sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zsb
),
720 &xzp
->z_links
, sizeof (xzp
->z_links
), tx
));
721 mutex_exit(&xzp
->z_lock
);
722 zfs_unlinked_add(xzp
, tx
);
725 /* Remove this znode from the unlinked set */
727 zap_remove_int(zsb
->z_os
, zsb
->z_unlinkedobj
, zp
->z_id
, tx
));
729 zfs_znode_delete(zp
, tx
);
738 zfs_dirent(znode_t
*zp
, uint64_t mode
)
740 uint64_t de
= zp
->z_id
;
742 if (ZTOZSB(zp
)->z_version
>= ZPL_VERSION_DIRENT_TYPE
)
743 de
|= IFTODT(mode
) << 60;
748 * Link zp into dl. Can only fail if zp has been unlinked.
751 zfs_link_create(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
)
753 znode_t
*dzp
= dl
->dl_dzp
;
754 zfs_sb_t
*zsb
= ZTOZSB(zp
);
756 int zp_is_dir
= S_ISDIR(ZTOI(zp
)->i_mode
);
757 sa_bulk_attr_t bulk
[5];
758 uint64_t mtime
[2], ctime
[2];
762 mutex_enter(&zp
->z_lock
);
764 if (!(flag
& ZRENAMING
)) {
765 if (zp
->z_unlinked
) { /* no new links to unlinked zp */
766 ASSERT(!(flag
& (ZNEW
| ZEXISTS
)));
767 mutex_exit(&zp
->z_lock
);
771 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
), NULL
,
772 &zp
->z_links
, sizeof (zp
->z_links
));
775 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_PARENT(zsb
), NULL
,
776 &dzp
->z_id
, sizeof (dzp
->z_id
));
777 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
778 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
780 if (!(flag
& ZNEW
)) {
781 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
782 ctime
, sizeof (ctime
));
783 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
,
786 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
789 mutex_exit(&zp
->z_lock
);
791 mutex_enter(&dzp
->z_lock
);
793 dzp
->z_links
+= zp_is_dir
;
795 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
,
796 &dzp
->z_size
, sizeof (dzp
->z_size
));
797 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
), NULL
,
798 &dzp
->z_links
, sizeof (dzp
->z_links
));
799 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
800 mtime
, sizeof (mtime
));
801 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
802 ctime
, sizeof (ctime
));
803 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
804 &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
805 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
806 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
808 mutex_exit(&dzp
->z_lock
);
810 value
= zfs_dirent(zp
, zp
->z_mode
);
811 error
= zap_add(ZTOZSB(zp
)->z_os
, dzp
->z_id
, dl
->dl_name
,
819 zfs_dropname(zfs_dirlock_t
*dl
, znode_t
*zp
, znode_t
*dzp
, dmu_tx_t
*tx
,
824 if (ZTOZSB(zp
)->z_norm
) {
825 if (((ZTOZSB(zp
)->z_case
== ZFS_CASE_INSENSITIVE
) &&
826 (flag
& ZCIEXACT
)) ||
827 ((ZTOZSB(zp
)->z_case
== ZFS_CASE_MIXED
) &&
829 error
= zap_remove_norm(ZTOZSB(zp
)->z_os
,
830 dzp
->z_id
, dl
->dl_name
, MT_EXACT
, tx
);
832 error
= zap_remove_norm(ZTOZSB(zp
)->z_os
,
833 dzp
->z_id
, dl
->dl_name
, MT_FIRST
, tx
);
835 error
= zap_remove(ZTOZSB(zp
)->z_os
,
836 dzp
->z_id
, dl
->dl_name
, tx
);
843 * Unlink zp from dl, and mark zp for deletion if this was the last link.
844 * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
845 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
846 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
847 * and it's the caller's job to do it.
850 zfs_link_destroy(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
,
851 boolean_t
*unlinkedp
)
853 znode_t
*dzp
= dl
->dl_dzp
;
854 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
855 int zp_is_dir
= S_ISDIR(ZTOI(zp
)->i_mode
);
856 boolean_t unlinked
= B_FALSE
;
857 sa_bulk_attr_t bulk
[5];
858 uint64_t mtime
[2], ctime
[2];
863 dnlc_remove(ZTOI(dzp
), dl
->dl_name
);
864 #endif /* HAVE_DNLC */
866 if (!(flag
& ZRENAMING
)) {
867 mutex_enter(&zp
->z_lock
);
869 if (zp_is_dir
&& !zfs_dirempty(zp
)) {
870 mutex_exit(&zp
->z_lock
);
875 * If we get here, we are going to try to remove the object.
876 * First try removing the name from the directory; if that
877 * fails, return the error.
879 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
881 mutex_exit(&zp
->z_lock
);
885 if (zp
->z_links
<= zp_is_dir
) {
886 zfs_panic_recover("zfs: link count on %lu is %u, "
887 "should be at least %u", zp
->z_id
,
888 (int)zp
->z_links
, zp_is_dir
+ 1);
889 zp
->z_links
= zp_is_dir
+ 1;
891 if (--zp
->z_links
== zp_is_dir
) {
892 zp
->z_unlinked
= B_TRUE
;
896 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
),
897 NULL
, &ctime
, sizeof (ctime
));
898 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
),
899 NULL
, &zp
->z_pflags
, sizeof (zp
->z_pflags
));
900 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
903 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
),
904 NULL
, &zp
->z_links
, sizeof (zp
->z_links
));
905 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
908 mutex_exit(&zp
->z_lock
);
910 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
915 mutex_enter(&dzp
->z_lock
);
916 dzp
->z_size
--; /* one dirent removed */
917 dzp
->z_links
-= zp_is_dir
; /* ".." link from zp */
918 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
),
919 NULL
, &dzp
->z_links
, sizeof (dzp
->z_links
));
920 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
),
921 NULL
, &dzp
->z_size
, sizeof (dzp
->z_size
));
922 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
),
923 NULL
, ctime
, sizeof (ctime
));
924 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
925 NULL
, mtime
, sizeof (mtime
));
926 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
),
927 NULL
, &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
928 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
929 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
931 mutex_exit(&dzp
->z_lock
);
933 if (unlinkedp
!= NULL
)
934 *unlinkedp
= unlinked
;
936 zfs_unlinked_add(zp
, tx
);
942 * Indicate whether the directory is empty. Works with or without z_lock
943 * held, but can only be consider a hint in the latter case. Returns true
944 * if only "." and ".." remain and there's no work in progress.
947 zfs_dirempty(znode_t
*dzp
)
949 return (dzp
->z_size
== 2 && dzp
->z_dirlocks
== 0);
953 zfs_make_xattrdir(znode_t
*zp
, vattr_t
*vap
, struct inode
**xipp
, cred_t
*cr
)
955 zfs_sb_t
*zsb
= ZTOZSB(zp
);
959 zfs_acl_ids_t acl_ids
;
960 boolean_t fuid_dirtied
;
967 if ((error
= zfs_zaccess(zp
, ACE_WRITE_NAMED_ATTRS
, 0, B_FALSE
, cr
)))
970 if ((error
= zfs_acl_ids_create(zp
, IS_XATTR
, vap
, cr
, NULL
,
973 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
974 zfs_acl_ids_free(&acl_ids
);
979 tx
= dmu_tx_create(zsb
->z_os
);
980 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
981 ZFS_SA_BASE_ATTR_SIZE
);
982 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
983 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
984 fuid_dirtied
= zsb
->z_fuid_dirty
;
986 zfs_fuid_txhold(zsb
, tx
);
987 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
989 if (error
== ERESTART
) {
994 zfs_acl_ids_free(&acl_ids
);
998 zfs_mknode(zp
, vap
, tx
, cr
, IS_XATTR
, &xzp
, &acl_ids
);
1001 zfs_fuid_sync(zsb
, tx
);
1004 error
= sa_lookup(xzp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
1005 &parent
, sizeof (parent
));
1006 ASSERT(error
== 0 && parent
== zp
->z_id
);
1009 VERIFY(0 == sa_update(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
), &xzp
->z_id
,
1010 sizeof (xzp
->z_id
), tx
));
1012 (void) zfs_log_create(zsb
->z_log
, tx
, TX_MKXATTR
, zp
,
1013 xzp
, "", NULL
, acl_ids
.z_fuidp
, vap
);
1015 zfs_acl_ids_free(&acl_ids
);
1024 * Return a znode for the extended attribute directory for zp.
1025 * ** If the directory does not already exist, it is created **
1027 * IN: zp - znode to obtain attribute directory from
1028 * cr - credentials of caller
1029 * flags - flags from the VOP_LOOKUP call
1031 * OUT: xipp - pointer to extended attribute znode
1033 * RETURN: 0 on success
1034 * error number on failure
1037 zfs_get_xattrdir(znode_t
*zp
, struct inode
**xipp
, cred_t
*cr
, int flags
)
1039 zfs_sb_t
*zsb
= ZTOZSB(zp
);
1045 error
= zfs_dirent_lock(&dl
, zp
, "", &xzp
, ZXATTR
, NULL
, NULL
);
1051 zfs_dirent_unlock(dl
);
1055 if (!(flags
& CREATE_XATTR_DIR
)) {
1056 zfs_dirent_unlock(dl
);
1060 if (zfs_is_readonly(zsb
)) {
1061 zfs_dirent_unlock(dl
);
1066 * The ability to 'create' files in an attribute
1067 * directory comes from the write_xattr permission on the base file.
1069 * The ability to 'search' an attribute directory requires
1070 * read_xattr permission on the base file.
1072 * Once in a directory the ability to read/write attributes
1073 * is controlled by the permissions on the attribute file.
1075 va
.va_mask
= ATTR_MODE
| ATTR_UID
| ATTR_GID
;
1076 va
.va_mode
= S_IFDIR
| S_ISVTX
| 0777;
1077 zfs_fuid_map_ids(zp
, cr
, &va
.va_uid
, &va
.va_gid
);
1079 va
.va_dentry
= NULL
;
1080 error
= zfs_make_xattrdir(zp
, &va
, xipp
, cr
);
1081 zfs_dirent_unlock(dl
);
1083 if (error
== ERESTART
) {
1084 /* NB: we already did dmu_tx_wait() if necessary */
1092 * Decide whether it is okay to remove within a sticky directory.
1094 * In sticky directories, write access is not sufficient;
1095 * you can remove entries from a directory only if:
1097 * you own the directory,
1098 * you own the entry,
1099 * the entry is a plain file and you have write access,
1100 * or you are privileged (checked in secpolicy...).
1102 * The function returns 0 if remove access is granted.
1105 zfs_sticky_remove_access(znode_t
*zdp
, znode_t
*zp
, cred_t
*cr
)
1110 zfs_sb_t
*zsb
= ZTOZSB(zdp
);
1115 if ((zdp
->z_mode
& S_ISVTX
) == 0)
1118 downer
= zfs_fuid_map_id(zsb
, zdp
->z_uid
, cr
, ZFS_OWNER
);
1119 fowner
= zfs_fuid_map_id(zsb
, zp
->z_uid
, cr
, ZFS_OWNER
);
1121 if ((uid
= crgetuid(cr
)) == downer
|| uid
== fowner
||
1122 (S_ISDIR(ZTOI(zp
)->i_mode
) &&
1123 zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
) == 0))
1126 return (secpolicy_vnode_remove(cr
));