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
)
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(zsb
->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(zsb
->z_os
, dzp
->z_id
, name
, 8, 1, zoid
);
92 *zoid
= ZFS_DIRENT_OBJ(*zoid
);
95 if (error
== ENOENT
&& update
)
96 dnlc_update(ZTOI(dzp
), name
, DNLC_NO_VNODE
);
97 #endif /* HAVE_DNLC */
103 * Lock a directory entry. A dirlock on <dzp, name> protects that name
104 * in dzp's directory zap object. As long as you hold a dirlock, you can
105 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
106 * can change the zap entry for (i.e. link or unlink) this name.
109 * dzp - znode for directory
110 * name - name of entry to lock
111 * flag - ZNEW: if the entry already exists, fail with EEXIST.
112 * ZEXISTS: if the entry does not exist, fail with ENOENT.
113 * ZSHARED: allow concurrent access with other ZSHARED callers.
114 * ZXATTR: we want dzp's xattr directory
115 * ZCILOOK: On a mixed sensitivity file system,
116 * this lookup should be case-insensitive.
117 * ZCIEXACT: On a purely case-insensitive file system,
118 * this lookup should be case-sensitive.
119 * ZRENAMING: we are locking for renaming, force narrow locks
120 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
121 * current thread already holds it.
124 * zpp - pointer to the znode for the entry (NULL if there isn't one)
125 * dlpp - pointer to the dirlock for this entry (NULL on error)
126 * direntflags - (case-insensitive lookup only)
127 * flags if multiple case-sensitive matches exist in directory
128 * realpnp - (case-insensitive lookup only)
129 * actual name matched within the directory
131 * Return value: 0 on success or errno on failure.
133 * NOTE: Always checks for, and rejects, '.' and '..'.
134 * NOTE: For case-insensitive file systems we take wide locks (see below),
135 * but return znode pointers to a single match.
138 zfs_dirent_lock(zfs_dirlock_t
**dlpp
, znode_t
*dzp
, char *name
, znode_t
**zpp
,
139 int flag
, int *direntflags
, pathname_t
*realpnp
)
141 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
148 #endif /* HAVE_DNLC */
156 * Verify that we are not trying to lock '.', '..', or '.zfs'
158 if ((name
[0] == '.' &&
159 (name
[1] == '\0' || (name
[1] == '.' && name
[2] == '\0'))) ||
160 (zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0))
164 * Case sensitivity and normalization preferences are set when
165 * the file system is created. These are stored in the
166 * zsb->z_case and zsb->z_norm fields. These choices
167 * affect what vnodes can be cached in the DNLC, how we
168 * perform zap lookups, and the "width" of our dirlocks.
170 * A normal dirlock locks a single name. Note that with
171 * normalization a name can be composed multiple ways, but
172 * when normalized, these names all compare equal. A wide
173 * dirlock locks multiple names. We need these when the file
174 * system is supporting mixed-mode access. It is sometimes
175 * necessary to lock all case permutations of file name at
176 * once so that simultaneous case-insensitive/case-sensitive
177 * behaves as rationally as possible.
181 * Decide if exact matches should be requested when performing
182 * a zap lookup on file systems supporting case-insensitive
186 ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
) && (flag
& ZCIEXACT
)) ||
187 ((zsb
->z_case
== ZFS_CASE_MIXED
) && !(flag
& ZCILOOK
));
190 * Only look in or update the DNLC if we are looking for the
191 * name on a file system that does not require normalization
192 * or case folding. We can also look there if we happen to be
193 * on a non-normalizing, mixed sensitivity file system IF we
194 * are looking for the exact name.
196 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
197 * case for performance improvement?
199 update
= !zsb
->z_norm
||
200 ((zsb
->z_case
== ZFS_CASE_MIXED
) &&
201 !(zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
) && !(flag
& ZCILOOK
));
204 * ZRENAMING indicates we are in a situation where we should
205 * take narrow locks regardless of the file system's
206 * preferences for normalizing and case folding. This will
207 * prevent us deadlocking trying to grab the same wide lock
208 * twice if the two names happen to be case-insensitive
211 if (flag
& ZRENAMING
)
214 cmpflags
= zsb
->z_norm
;
217 * Wait until there are no locks on this name.
219 * Don't grab the the lock if it is already held. However, cannot
220 * have both ZSHARED and ZHAVELOCK together.
222 ASSERT(!(flag
& ZSHARED
) || !(flag
& ZHAVELOCK
));
223 if (!(flag
& ZHAVELOCK
))
224 rw_enter(&dzp
->z_name_lock
, RW_READER
);
226 mutex_enter(&dzp
->z_lock
);
228 if (dzp
->z_unlinked
) {
229 mutex_exit(&dzp
->z_lock
);
230 if (!(flag
& ZHAVELOCK
))
231 rw_exit(&dzp
->z_name_lock
);
234 for (dl
= dzp
->z_dirlocks
; dl
!= NULL
; dl
= dl
->dl_next
) {
235 if ((u8_strcmp(name
, dl
->dl_name
, 0, cmpflags
,
236 U8_UNICODE_LATEST
, &error
) == 0) || error
!= 0)
240 mutex_exit(&dzp
->z_lock
);
241 if (!(flag
& ZHAVELOCK
))
242 rw_exit(&dzp
->z_name_lock
);
247 * Allocate a new dirlock and add it to the list.
249 dl
= kmem_alloc(sizeof (zfs_dirlock_t
), KM_SLEEP
);
250 cv_init(&dl
->dl_cv
, NULL
, CV_DEFAULT
, NULL
);
256 dl
->dl_next
= dzp
->z_dirlocks
;
257 dzp
->z_dirlocks
= dl
;
260 if ((flag
& ZSHARED
) && dl
->dl_sharecnt
!= 0)
262 cv_wait(&dl
->dl_cv
, &dzp
->z_lock
);
266 * If the z_name_lock was NOT held for this dirlock record it.
268 if (flag
& ZHAVELOCK
)
271 if ((flag
& ZSHARED
) && ++dl
->dl_sharecnt
> 1 && dl
->dl_namesize
== 0) {
273 * We're the second shared reference to dl. Make a copy of
274 * dl_name in case the first thread goes away before we do.
275 * Note that we initialize the new name before storing its
276 * pointer into dl_name, because the first thread may load
277 * dl->dl_name at any time. He'll either see the old value,
278 * which is his, or the new shared copy; either is OK.
280 dl
->dl_namesize
= strlen(dl
->dl_name
) + 1;
281 name
= kmem_alloc(dl
->dl_namesize
, KM_SLEEP
);
282 bcopy(dl
->dl_name
, name
, dl
->dl_namesize
);
286 mutex_exit(&dzp
->z_lock
);
289 * We have a dirlock on the name. (Note that it is the dirlock,
290 * not the dzp's z_lock, that protects the name in the zap object.)
291 * See if there's an object by this name; if so, put a hold on it.
294 error
= sa_lookup(dzp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
), &zoid
,
297 error
= (zoid
== 0 ? ENOENT
: 0);
301 vp
= dnlc_lookup(ZTOI(dzp
), name
);
302 if (vp
== DNLC_NO_VNODE
) {
307 zfs_dirent_unlock(dl
);
315 error
= zfs_match_find(zsb
, dzp
, name
, exact
,
316 update
, direntflags
, realpnp
, &zoid
);
319 error
= zfs_match_find(zsb
, dzp
, name
, exact
,
320 update
, direntflags
, realpnp
, &zoid
);
321 #endif /* HAVE_DNLC */
324 if (error
!= ENOENT
|| (flag
& ZEXISTS
)) {
325 zfs_dirent_unlock(dl
);
330 zfs_dirent_unlock(dl
);
333 error
= zfs_zget(zsb
, zoid
, zpp
);
335 zfs_dirent_unlock(dl
);
339 if (!(flag
& ZXATTR
) && update
)
340 dnlc_update(ZTOI(dzp
), name
, ZTOI(*zpp
));
341 #endif /* HAVE_DNLC */
350 * Unlock this directory entry and wake anyone who was waiting for it.
353 zfs_dirent_unlock(zfs_dirlock_t
*dl
)
355 znode_t
*dzp
= dl
->dl_dzp
;
356 zfs_dirlock_t
**prev_dl
, *cur_dl
;
358 mutex_enter(&dzp
->z_lock
);
360 if (!dl
->dl_namelock
)
361 rw_exit(&dzp
->z_name_lock
);
363 if (dl
->dl_sharecnt
> 1) {
365 mutex_exit(&dzp
->z_lock
);
368 prev_dl
= &dzp
->z_dirlocks
;
369 while ((cur_dl
= *prev_dl
) != dl
)
370 prev_dl
= &cur_dl
->dl_next
;
371 *prev_dl
= dl
->dl_next
;
372 cv_broadcast(&dl
->dl_cv
);
373 mutex_exit(&dzp
->z_lock
);
375 if (dl
->dl_namesize
!= 0)
376 kmem_free(dl
->dl_name
, dl
->dl_namesize
);
377 cv_destroy(&dl
->dl_cv
);
378 kmem_free(dl
, sizeof (*dl
));
382 * Look up an entry in a directory.
384 * NOTE: '.' and '..' are handled as special cases because
385 * no directory entries are actually stored for them. If this is
386 * the root of a filesystem, then '.zfs' is also treated as a
387 * special pseudo-directory.
390 zfs_dirlook(znode_t
*dzp
, char *name
, struct inode
**ipp
, int flags
,
391 int *deflg
, pathname_t
*rpnp
)
398 if (name
[0] == 0 || (name
[0] == '.' && name
[1] == 0)) {
401 } else if (name
[0] == '.' && name
[1] == '.' && name
[2] == 0) {
402 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
405 * If we are a snapshot mounted under .zfs, return
406 * the vp for the snapshot directory.
408 if ((error
= sa_lookup(dzp
->z_sa_hdl
,
409 SA_ZPL_PARENT(zsb
), &parent
, sizeof (parent
))) != 0)
412 if (parent
== dzp
->z_id
&& zsb
->z_parent
!= zsb
) {
413 error
= zfsctl_root_lookup(zsb
->z_parent
->z_ctldir
,
414 "snapshot", ipp
, NULL
, 0, NULL
, kcred
,
418 #endif /* HAVE_SNAPSHOT */
419 rw_enter(&dzp
->z_parent_lock
, RW_READER
);
420 error
= zfs_zget(zsb
, parent
, &zp
);
423 rw_exit(&dzp
->z_parent_lock
);
425 } else if (zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0) {
426 *ipp
= zfsctl_root(dzp
);
427 #endif /* HAVE_SNAPSHOT */
431 zf
= ZEXISTS
| ZSHARED
;
432 if (flags
& FIGNORECASE
)
435 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zf
, deflg
, rpnp
);
438 zfs_dirent_unlock(dl
);
439 dzp
->z_zn_prefetch
= B_TRUE
; /* enable prefetching */
444 if ((flags
& FIGNORECASE
) && rpnp
&& !error
)
445 (void) strlcpy(rpnp
->pn_buf
, name
, rpnp
->pn_bufsize
);
451 * unlinked Set (formerly known as the "delete queue") Error Handling
453 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
454 * don't specify the name of the entry that we will be manipulating. We
455 * also fib and say that we won't be adding any new entries to the
456 * unlinked set, even though we might (this is to lower the minimum file
457 * size that can be deleted in a full filesystem). So on the small
458 * chance that the nlink list is using a fat zap (ie. has more than
459 * 2000 entries), we *may* not pre-read a block that's needed.
460 * Therefore it is remotely possible for some of the assertions
461 * regarding the unlinked set below to fail due to i/o error. On a
462 * nondebug system, this will result in the space being leaked.
465 zfs_unlinked_add(znode_t
*zp
, dmu_tx_t
*tx
)
467 zfs_sb_t
*zsb
= ZTOZSB(zp
);
469 ASSERT(zp
->z_unlinked
);
470 ASSERT(zp
->z_links
== 0);
473 zap_add_int(zsb
->z_os
, zsb
->z_unlinkedobj
, zp
->z_id
, tx
));
477 * Delete the entire contents of a directory. Return a count
478 * of the number of entries that could not be deleted. If we encounter
479 * an error, return a count of at least one so that the directory stays
480 * in the unlinked set.
482 * NOTE: this function assumes that the directory is inactive,
483 * so there is no need to lock its entries before deletion.
484 * Also, it assumes the directory contents is *only* regular
488 zfs_purgedir(znode_t
*dzp
)
494 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
499 for (zap_cursor_init(&zc
, zsb
->z_os
, dzp
->z_id
);
500 (error
= zap_cursor_retrieve(&zc
, &zap
)) == 0;
501 zap_cursor_advance(&zc
)) {
502 error
= zfs_zget(zsb
,
503 ZFS_DIRENT_OBJ(zap
.za_first_integer
), &xzp
);
509 ASSERT(S_ISREG(ZTOI(xzp
)->i_mode
)||S_ISLNK(ZTOI(xzp
)->i_mode
));
511 tx
= dmu_tx_create(zsb
->z_os
);
512 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
513 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, zap
.za_name
);
514 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
515 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
516 /* Is this really needed ? */
517 zfs_sa_upgrade_txholds(tx
, xzp
);
518 error
= dmu_tx_assign(tx
, TXG_WAIT
);
525 bzero(&dl
, sizeof (dl
));
527 dl
.dl_name
= zap
.za_name
;
529 error
= zfs_link_destroy(&dl
, xzp
, tx
, 0, NULL
);
536 zap_cursor_fini(&zc
);
543 * Clean up any znodes that had no links when we either crashed or
544 * (force) umounted the file system.
547 zfs_unlinked_drain(zfs_sb_t
*zsb
)
551 dmu_object_info_t doi
;
556 * Interate over the contents of the unlinked set.
558 for (zap_cursor_init(&zc
, zsb
->z_os
, zsb
->z_unlinkedobj
);
559 zap_cursor_retrieve(&zc
, &zap
) == 0;
560 zap_cursor_advance(&zc
)) {
563 * See what kind of object we have in list
566 error
= dmu_object_info(zsb
->z_os
, zap
.za_first_integer
, &doi
);
570 ASSERT((doi
.doi_type
== DMU_OT_PLAIN_FILE_CONTENTS
) ||
571 (doi
.doi_type
== DMU_OT_DIRECTORY_CONTENTS
));
573 * We need to re-mark these list entries for deletion,
574 * so we pull them back into core and set zp->z_unlinked.
576 error
= zfs_zget(zsb
, zap
.za_first_integer
, &zp
);
579 * We may pick up znodes that are already marked for deletion.
580 * This could happen during the purge of an extended attribute
581 * directory. All we need to do is skip over them, since they
582 * are already in the system marked z_unlinked.
587 zp
->z_unlinked
= B_TRUE
;
590 * If this is an attribute directory, purge its contents.
592 if (S_ISDIR(ZTOI(zp
)->i_mode
) && (zp
->z_pflags
& ZFS_XATTR
)) {
594 * We don't need to check the return value of
595 * zfs_purgedir here, because zfs_rmnode will just
596 * return this xattr directory to the unlinked set
597 * until all of its xattrs are gone.
599 (void) zfs_purgedir(zp
);
604 zap_cursor_fini(&zc
);
608 zfs_rmnode(znode_t
*zp
)
610 zfs_sb_t
*zsb
= ZTOZSB(zp
);
611 objset_t
*os
= zsb
->z_os
;
619 ASSERT(zp
->z_links
== 0);
620 ASSERT(atomic_read(&ZTOI(zp
)->i_count
) == 0);
623 * If this is an attribute directory, purge its contents.
625 if (S_ISDIR(ZTOI(zp
)->i_mode
) && (zp
->z_pflags
& ZFS_XATTR
)) {
626 error
= zap_count(os
, zp
->z_id
, &count
);
628 zfs_znode_dmu_fini(zp
);
636 * There are still directory entries in this xattr
637 * directory. Let zfs_unlinked_drain() deal with
638 * them to avoid deadlocking this process in the
639 * zfs_purgedir()->zfs_zget()->ilookup() callpath
640 * on the xattr inode's I_FREEING bit.
642 taskq
= dsl_pool_iput_taskq(dmu_objset_pool(os
));
643 taskq_dispatch(taskq
, (task_func_t
*)
644 zfs_unlinked_drain
, zsb
, TQ_SLEEP
);
646 zfs_znode_dmu_fini(zp
);
652 * Free up all the data in the file.
654 error
= dmu_free_long_range(os
, zp
->z_id
, 0, DMU_OBJECT_END
);
657 * Not enough space. Leave the file in the unlinked set.
659 zfs_znode_dmu_fini(zp
);
664 * If the file has extended attributes, we're going to unlink
667 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
668 &xattr_obj
, sizeof (xattr_obj
));
669 if (error
== 0 && xattr_obj
) {
670 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
674 acl_obj
= zfs_external_acl(zp
);
677 * Set up the final transaction.
679 tx
= dmu_tx_create(os
);
680 dmu_tx_hold_free(tx
, zp
->z_id
, 0, DMU_OBJECT_END
);
681 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
683 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, TRUE
, NULL
);
684 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
687 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
689 zfs_sa_upgrade_txholds(tx
, zp
);
690 error
= dmu_tx_assign(tx
, TXG_WAIT
);
693 * Not enough space to delete the file. Leave it in the
694 * unlinked set, leaking it until the fs is remounted (at
695 * which point we'll call zfs_unlinked_drain() to process it).
698 zfs_znode_dmu_fini(zp
);
704 mutex_enter(&xzp
->z_lock
);
705 xzp
->z_unlinked
= B_TRUE
; /* mark xzp for deletion */
706 xzp
->z_links
= 0; /* no more links to it */
707 VERIFY(0 == sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zsb
),
708 &xzp
->z_links
, sizeof (xzp
->z_links
), tx
));
709 mutex_exit(&xzp
->z_lock
);
710 zfs_unlinked_add(xzp
, tx
);
713 /* Remove this znode from the unlinked set */
715 zap_remove_int(zsb
->z_os
, zsb
->z_unlinkedobj
, zp
->z_id
, tx
));
717 zfs_znode_delete(zp
, tx
);
726 zfs_dirent(znode_t
*zp
, uint64_t mode
)
728 uint64_t de
= zp
->z_id
;
730 if (ZTOZSB(zp
)->z_version
>= ZPL_VERSION_DIRENT_TYPE
)
731 de
|= IFTODT(mode
) << 60;
736 * Link zp into dl. Can only fail if zp has been unlinked.
739 zfs_link_create(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
)
741 znode_t
*dzp
= dl
->dl_dzp
;
742 zfs_sb_t
*zsb
= ZTOZSB(zp
);
744 int zp_is_dir
= S_ISDIR(ZTOI(zp
)->i_mode
);
745 sa_bulk_attr_t bulk
[5];
746 uint64_t mtime
[2], ctime
[2];
750 mutex_enter(&zp
->z_lock
);
752 if (!(flag
& ZRENAMING
)) {
753 if (zp
->z_unlinked
) { /* no new links to unlinked zp */
754 ASSERT(!(flag
& (ZNEW
| ZEXISTS
)));
755 mutex_exit(&zp
->z_lock
);
759 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
), NULL
,
760 &zp
->z_links
, sizeof (zp
->z_links
));
763 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_PARENT(zsb
), NULL
,
764 &dzp
->z_id
, sizeof (dzp
->z_id
));
765 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
766 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
768 if (!(flag
& ZNEW
)) {
769 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
770 ctime
, sizeof (ctime
));
771 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
,
774 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
777 mutex_exit(&zp
->z_lock
);
779 mutex_enter(&dzp
->z_lock
);
781 dzp
->z_links
+= zp_is_dir
;
783 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
,
784 &dzp
->z_size
, sizeof (dzp
->z_size
));
785 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
), NULL
,
786 &dzp
->z_links
, sizeof (dzp
->z_links
));
787 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
788 mtime
, sizeof (mtime
));
789 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
790 ctime
, sizeof (ctime
));
791 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
792 &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
793 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
794 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
796 mutex_exit(&dzp
->z_lock
);
798 value
= zfs_dirent(zp
, zp
->z_mode
);
799 error
= zap_add(ZTOZSB(zp
)->z_os
, dzp
->z_id
, dl
->dl_name
,
807 zfs_dropname(zfs_dirlock_t
*dl
, znode_t
*zp
, znode_t
*dzp
, dmu_tx_t
*tx
,
812 if (ZTOZSB(zp
)->z_norm
) {
813 if (((ZTOZSB(zp
)->z_case
== ZFS_CASE_INSENSITIVE
) &&
814 (flag
& ZCIEXACT
)) ||
815 ((ZTOZSB(zp
)->z_case
== ZFS_CASE_MIXED
) &&
817 error
= zap_remove_norm(ZTOZSB(zp
)->z_os
,
818 dzp
->z_id
, dl
->dl_name
, MT_EXACT
, tx
);
820 error
= zap_remove_norm(ZTOZSB(zp
)->z_os
,
821 dzp
->z_id
, dl
->dl_name
, MT_FIRST
, tx
);
823 error
= zap_remove(ZTOZSB(zp
)->z_os
,
824 dzp
->z_id
, dl
->dl_name
, tx
);
831 * Unlink zp from dl, and mark zp for deletion if this was the last link.
832 * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
833 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
834 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
835 * and it's the caller's job to do it.
838 zfs_link_destroy(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
,
839 boolean_t
*unlinkedp
)
841 znode_t
*dzp
= dl
->dl_dzp
;
842 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
843 int zp_is_dir
= S_ISDIR(ZTOI(zp
)->i_mode
);
844 boolean_t unlinked
= B_FALSE
;
845 sa_bulk_attr_t bulk
[5];
846 uint64_t mtime
[2], ctime
[2];
851 dnlc_remove(ZTOI(dzp
), dl
->dl_name
);
852 #endif /* HAVE_DNLC */
854 if (!(flag
& ZRENAMING
)) {
855 mutex_enter(&zp
->z_lock
);
857 if (zp_is_dir
&& !zfs_dirempty(zp
)) {
858 mutex_exit(&zp
->z_lock
);
863 * If we get here, we are going to try to remove the object.
864 * First try removing the name from the directory; if that
865 * fails, return the error.
867 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
869 mutex_exit(&zp
->z_lock
);
873 if (zp
->z_links
<= zp_is_dir
) {
874 zfs_panic_recover("zfs: link count on %lu is %u, "
875 "should be at least %u", zp
->z_id
,
876 (int)zp
->z_links
, zp_is_dir
+ 1);
877 zp
->z_links
= zp_is_dir
+ 1;
879 if (--zp
->z_links
== zp_is_dir
) {
880 zp
->z_unlinked
= B_TRUE
;
884 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
),
885 NULL
, &ctime
, sizeof (ctime
));
886 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
),
887 NULL
, &zp
->z_pflags
, sizeof (zp
->z_pflags
));
888 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
891 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
),
892 NULL
, &zp
->z_links
, sizeof (zp
->z_links
));
893 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
896 mutex_exit(&zp
->z_lock
);
898 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
903 mutex_enter(&dzp
->z_lock
);
904 dzp
->z_size
--; /* one dirent removed */
905 dzp
->z_links
-= zp_is_dir
; /* ".." link from zp */
906 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
),
907 NULL
, &dzp
->z_links
, sizeof (dzp
->z_links
));
908 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
),
909 NULL
, &dzp
->z_size
, sizeof (dzp
->z_size
));
910 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
),
911 NULL
, ctime
, sizeof (ctime
));
912 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
913 NULL
, mtime
, sizeof (mtime
));
914 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
),
915 NULL
, &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
916 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
917 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
919 mutex_exit(&dzp
->z_lock
);
921 if (unlinkedp
!= NULL
)
922 *unlinkedp
= unlinked
;
924 zfs_unlinked_add(zp
, tx
);
930 * Indicate whether the directory is empty. Works with or without z_lock
931 * held, but can only be consider a hint in the latter case. Returns true
932 * if only "." and ".." remain and there's no work in progress.
935 zfs_dirempty(znode_t
*dzp
)
937 return (dzp
->z_size
== 2 && dzp
->z_dirlocks
== 0);
941 zfs_make_xattrdir(znode_t
*zp
, vattr_t
*vap
, struct inode
**xipp
, cred_t
*cr
)
943 zfs_sb_t
*zsb
= ZTOZSB(zp
);
947 zfs_acl_ids_t acl_ids
;
948 boolean_t fuid_dirtied
;
955 if ((error
= zfs_zaccess(zp
, ACE_WRITE_NAMED_ATTRS
, 0, B_FALSE
, cr
)))
958 if ((error
= zfs_acl_ids_create(zp
, IS_XATTR
, vap
, cr
, NULL
,
961 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
962 zfs_acl_ids_free(&acl_ids
);
967 tx
= dmu_tx_create(zsb
->z_os
);
968 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
969 ZFS_SA_BASE_ATTR_SIZE
);
970 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
971 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
972 fuid_dirtied
= zsb
->z_fuid_dirty
;
974 zfs_fuid_txhold(zsb
, tx
);
975 error
= dmu_tx_assign(tx
, TXG_NOWAIT
);
977 if (error
== ERESTART
) {
982 zfs_acl_ids_free(&acl_ids
);
986 zfs_mknode(zp
, vap
, tx
, cr
, IS_XATTR
, &xzp
, &acl_ids
);
989 zfs_fuid_sync(zsb
, tx
);
992 error
= sa_lookup(xzp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
993 &parent
, sizeof (parent
));
994 ASSERT(error
== 0 && parent
== zp
->z_id
);
997 VERIFY(0 == sa_update(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
), &xzp
->z_id
,
998 sizeof (xzp
->z_id
), tx
));
1000 (void) zfs_log_create(zsb
->z_log
, tx
, TX_MKXATTR
, zp
,
1001 xzp
, "", NULL
, acl_ids
.z_fuidp
, vap
);
1003 zfs_acl_ids_free(&acl_ids
);
1012 * Return a znode for the extended attribute directory for zp.
1013 * ** If the directory does not already exist, it is created **
1015 * IN: zp - znode to obtain attribute directory from
1016 * cr - credentials of caller
1017 * flags - flags from the VOP_LOOKUP call
1019 * OUT: xipp - pointer to extended attribute znode
1021 * RETURN: 0 on success
1022 * error number on failure
1025 zfs_get_xattrdir(znode_t
*zp
, struct inode
**xipp
, cred_t
*cr
, int flags
)
1027 zfs_sb_t
*zsb
= ZTOZSB(zp
);
1033 error
= zfs_dirent_lock(&dl
, zp
, "", &xzp
, ZXATTR
, NULL
, NULL
);
1039 zfs_dirent_unlock(dl
);
1043 if (!(flags
& CREATE_XATTR_DIR
)) {
1044 zfs_dirent_unlock(dl
);
1048 if (zsb
->z_vfs
->mnt_flags
& MNT_READONLY
) {
1049 zfs_dirent_unlock(dl
);
1054 * The ability to 'create' files in an attribute
1055 * directory comes from the write_xattr permission on the base file.
1057 * The ability to 'search' an attribute directory requires
1058 * read_xattr permission on the base file.
1060 * Once in a directory the ability to read/write attributes
1061 * is controlled by the permissions on the attribute file.
1063 va
.va_mask
= ATTR_MODE
| ATTR_UID
| ATTR_GID
;
1064 va
.va_mode
= S_IFDIR
| S_ISVTX
| 0777;
1065 zfs_fuid_map_ids(zp
, cr
, &va
.va_uid
, &va
.va_gid
);
1067 va
.va_dentry
= NULL
;
1068 error
= zfs_make_xattrdir(zp
, &va
, xipp
, cr
);
1069 zfs_dirent_unlock(dl
);
1071 if (error
== ERESTART
) {
1072 /* NB: we already did dmu_tx_wait() if necessary */
1080 * Decide whether it is okay to remove within a sticky directory.
1082 * In sticky directories, write access is not sufficient;
1083 * you can remove entries from a directory only if:
1085 * you own the directory,
1086 * you own the entry,
1087 * the entry is a plain file and you have write access,
1088 * or you are privileged (checked in secpolicy...).
1090 * The function returns 0 if remove access is granted.
1093 zfs_sticky_remove_access(znode_t
*zdp
, znode_t
*zp
, cred_t
*cr
)
1098 zfs_sb_t
*zsb
= ZTOZSB(zdp
);
1103 if ((zdp
->z_mode
& S_ISVTX
) == 0)
1106 downer
= zfs_fuid_map_id(zsb
, zdp
->z_uid
, cr
, ZFS_OWNER
);
1107 fowner
= zfs_fuid_map_id(zsb
, zp
->z_uid
, cr
, ZFS_OWNER
);
1109 if ((uid
= crgetuid(cr
)) == downer
|| uid
== fowner
||
1110 (S_ISDIR(ZTOI(zp
)->i_mode
) &&
1111 zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
) == 0))
1114 return (secpolicy_vnode_remove(cr
));