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.
23 * Copyright (c) 2013 by Delphix. All rights reserved.
27 #include <sys/types.h>
28 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/sysmacros.h>
32 #include <sys/resource.h>
34 #include <sys/vnode.h>
39 #include <sys/pathname.h>
40 #include <sys/cmn_err.h>
41 #include <sys/errno.h>
43 #include <sys/unistd.h>
44 #include <sys/sunddi.h>
45 #include <sys/random.h>
46 #include <sys/policy.h>
47 #include <sys/zfs_dir.h>
48 #include <sys/zfs_acl.h>
49 #include <sys/fs/zfs.h>
50 #include "fs/fs_subr.h"
53 #include <sys/atomic.h>
54 #include <sys/zfs_ctldir.h>
55 #include <sys/zfs_fuid.h>
57 #include <sys/zfs_sa.h>
59 #include <sys/extdirent.h>
62 * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups
63 * of names after deciding which is the appropriate lookup interface.
66 zfs_match_find(zfs_sb_t
*zsb
, znode_t
*dzp
, char *name
, boolean_t exact
,
67 boolean_t update
, int *deflags
, pathname_t
*rpnp
, uint64_t *zoid
)
69 boolean_t conflict
= B_FALSE
;
73 matchtype_t mt
= MT_FIRST
;
79 bufsz
= rpnp
->pn_bufsize
;
84 * In the non-mixed case we only expect there would ever
85 * be one match, but we need to use the normalizing lookup.
87 error
= zap_lookup_norm(zsb
->z_os
, dzp
->z_id
, name
, 8, 1,
88 zoid
, mt
, buf
, bufsz
, &conflict
);
90 error
= zap_lookup(zsb
->z_os
, dzp
->z_id
, name
, 8, 1, zoid
);
94 * Allow multiple entries provided the first entry is
95 * the object id. Non-zpl consumers may safely make
96 * use of the additional space.
98 * XXX: This should be a feature flag for compatibility
100 if (error
== EOVERFLOW
)
103 if (zsb
->z_norm
&& !error
&& deflags
)
104 *deflags
= conflict
? ED_CASE_CONFLICT
: 0;
106 *zoid
= ZFS_DIRENT_OBJ(*zoid
);
109 if (error
== ENOENT
&& update
)
110 dnlc_update(ZTOI(dzp
), name
, DNLC_NO_VNODE
);
111 #endif /* HAVE_DNLC */
117 * Lock a directory entry. A dirlock on <dzp, name> protects that name
118 * in dzp's directory zap object. As long as you hold a dirlock, you can
119 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
120 * can change the zap entry for (i.e. link or unlink) this name.
123 * dzp - znode for directory
124 * name - name of entry to lock
125 * flag - ZNEW: if the entry already exists, fail with EEXIST.
126 * ZEXISTS: if the entry does not exist, fail with ENOENT.
127 * ZSHARED: allow concurrent access with other ZSHARED callers.
128 * ZXATTR: we want dzp's xattr directory
129 * ZCILOOK: On a mixed sensitivity file system,
130 * this lookup should be case-insensitive.
131 * ZCIEXACT: On a purely case-insensitive file system,
132 * this lookup should be case-sensitive.
133 * ZRENAMING: we are locking for renaming, force narrow locks
134 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
135 * current thread already holds it.
138 * zpp - pointer to the znode for the entry (NULL if there isn't one)
139 * dlpp - pointer to the dirlock for this entry (NULL on error)
140 * direntflags - (case-insensitive lookup only)
141 * flags if multiple case-sensitive matches exist in directory
142 * realpnp - (case-insensitive lookup only)
143 * actual name matched within the directory
145 * Return value: 0 on success or errno on failure.
147 * NOTE: Always checks for, and rejects, '.' and '..'.
148 * NOTE: For case-insensitive file systems we take wide locks (see below),
149 * but return znode pointers to a single match.
152 zfs_dirent_lock(zfs_dirlock_t
**dlpp
, znode_t
*dzp
, char *name
, znode_t
**zpp
,
153 int flag
, int *direntflags
, pathname_t
*realpnp
)
155 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
162 #endif /* HAVE_DNLC */
170 * Verify that we are not trying to lock '.', '..', or '.zfs'
172 if ((name
[0] == '.' &&
173 (name
[1] == '\0' || (name
[1] == '.' && name
[2] == '\0'))) ||
174 (zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0))
175 return (SET_ERROR(EEXIST
));
178 * Case sensitivity and normalization preferences are set when
179 * the file system is created. These are stored in the
180 * zsb->z_case and zsb->z_norm fields. These choices
181 * affect what vnodes can be cached in the DNLC, how we
182 * perform zap lookups, and the "width" of our dirlocks.
184 * A normal dirlock locks a single name. Note that with
185 * normalization a name can be composed multiple ways, but
186 * when normalized, these names all compare equal. A wide
187 * dirlock locks multiple names. We need these when the file
188 * system is supporting mixed-mode access. It is sometimes
189 * necessary to lock all case permutations of file name at
190 * once so that simultaneous case-insensitive/case-sensitive
191 * behaves as rationally as possible.
195 * Decide if exact matches should be requested when performing
196 * a zap lookup on file systems supporting case-insensitive
200 ((zsb
->z_case
== ZFS_CASE_INSENSITIVE
) && (flag
& ZCIEXACT
)) ||
201 ((zsb
->z_case
== ZFS_CASE_MIXED
) && !(flag
& ZCILOOK
));
204 * Only look in or update the DNLC if we are looking for the
205 * name on a file system that does not require normalization
206 * or case folding. We can also look there if we happen to be
207 * on a non-normalizing, mixed sensitivity file system IF we
208 * are looking for the exact name.
210 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
211 * case for performance improvement?
213 update
= !zsb
->z_norm
||
214 ((zsb
->z_case
== ZFS_CASE_MIXED
) &&
215 !(zsb
->z_norm
& ~U8_TEXTPREP_TOUPPER
) && !(flag
& ZCILOOK
));
218 * ZRENAMING indicates we are in a situation where we should
219 * take narrow locks regardless of the file system's
220 * preferences for normalizing and case folding. This will
221 * prevent us deadlocking trying to grab the same wide lock
222 * twice if the two names happen to be case-insensitive
225 if (flag
& ZRENAMING
)
228 cmpflags
= zsb
->z_norm
;
231 * Wait until there are no locks on this name.
233 * Don't grab the the lock if it is already held. However, cannot
234 * have both ZSHARED and ZHAVELOCK together.
236 ASSERT(!(flag
& ZSHARED
) || !(flag
& ZHAVELOCK
));
237 if (!(flag
& ZHAVELOCK
))
238 rw_enter(&dzp
->z_name_lock
, RW_READER
);
240 mutex_enter(&dzp
->z_lock
);
242 if (dzp
->z_unlinked
) {
243 mutex_exit(&dzp
->z_lock
);
244 if (!(flag
& ZHAVELOCK
))
245 rw_exit(&dzp
->z_name_lock
);
246 return (SET_ERROR(ENOENT
));
248 for (dl
= dzp
->z_dirlocks
; dl
!= NULL
; dl
= dl
->dl_next
) {
249 if ((u8_strcmp(name
, dl
->dl_name
, 0, cmpflags
,
250 U8_UNICODE_LATEST
, &error
) == 0) || error
!= 0)
254 mutex_exit(&dzp
->z_lock
);
255 if (!(flag
& ZHAVELOCK
))
256 rw_exit(&dzp
->z_name_lock
);
257 return (SET_ERROR(ENOENT
));
261 * Allocate a new dirlock and add it to the list.
263 dl
= kmem_alloc(sizeof (zfs_dirlock_t
), KM_SLEEP
);
264 cv_init(&dl
->dl_cv
, NULL
, CV_DEFAULT
, NULL
);
270 dl
->dl_next
= dzp
->z_dirlocks
;
271 dzp
->z_dirlocks
= dl
;
274 if ((flag
& ZSHARED
) && dl
->dl_sharecnt
!= 0)
276 cv_wait(&dl
->dl_cv
, &dzp
->z_lock
);
280 * If the z_name_lock was NOT held for this dirlock record it.
282 if (flag
& ZHAVELOCK
)
285 if ((flag
& ZSHARED
) && ++dl
->dl_sharecnt
> 1 && dl
->dl_namesize
== 0) {
287 * We're the second shared reference to dl. Make a copy of
288 * dl_name in case the first thread goes away before we do.
289 * Note that we initialize the new name before storing its
290 * pointer into dl_name, because the first thread may load
291 * dl->dl_name at any time. He'll either see the old value,
292 * which is his, or the new shared copy; either is OK.
294 dl
->dl_namesize
= strlen(dl
->dl_name
) + 1;
295 name
= kmem_alloc(dl
->dl_namesize
, KM_SLEEP
);
296 bcopy(dl
->dl_name
, name
, dl
->dl_namesize
);
300 mutex_exit(&dzp
->z_lock
);
303 * We have a dirlock on the name. (Note that it is the dirlock,
304 * not the dzp's z_lock, that protects the name in the zap object.)
305 * See if there's an object by this name; if so, put a hold on it.
308 error
= sa_lookup(dzp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
), &zoid
,
311 error
= (zoid
== 0 ? SET_ERROR(ENOENT
) : 0);
315 vp
= dnlc_lookup(ZTOI(dzp
), name
);
316 if (vp
== DNLC_NO_VNODE
) {
318 error
= SET_ERROR(ENOENT
);
321 zfs_dirent_unlock(dl
);
323 return (SET_ERROR(EEXIST
));
329 error
= zfs_match_find(zsb
, dzp
, name
, exact
,
330 update
, direntflags
, realpnp
, &zoid
);
333 error
= zfs_match_find(zsb
, dzp
, name
, exact
,
334 update
, direntflags
, realpnp
, &zoid
);
335 #endif /* HAVE_DNLC */
338 if (error
!= ENOENT
|| (flag
& ZEXISTS
)) {
339 zfs_dirent_unlock(dl
);
344 zfs_dirent_unlock(dl
);
345 return (SET_ERROR(EEXIST
));
347 error
= zfs_zget(zsb
, zoid
, zpp
);
349 zfs_dirent_unlock(dl
);
353 if (!(flag
& ZXATTR
) && update
)
354 dnlc_update(ZTOI(dzp
), name
, ZTOI(*zpp
));
355 #endif /* HAVE_DNLC */
364 * Unlock this directory entry and wake anyone who was waiting for it.
367 zfs_dirent_unlock(zfs_dirlock_t
*dl
)
369 znode_t
*dzp
= dl
->dl_dzp
;
370 zfs_dirlock_t
**prev_dl
, *cur_dl
;
372 mutex_enter(&dzp
->z_lock
);
374 if (!dl
->dl_namelock
)
375 rw_exit(&dzp
->z_name_lock
);
377 if (dl
->dl_sharecnt
> 1) {
379 mutex_exit(&dzp
->z_lock
);
382 prev_dl
= &dzp
->z_dirlocks
;
383 while ((cur_dl
= *prev_dl
) != dl
)
384 prev_dl
= &cur_dl
->dl_next
;
385 *prev_dl
= dl
->dl_next
;
386 cv_broadcast(&dl
->dl_cv
);
387 mutex_exit(&dzp
->z_lock
);
389 if (dl
->dl_namesize
!= 0)
390 kmem_free(dl
->dl_name
, dl
->dl_namesize
);
391 cv_destroy(&dl
->dl_cv
);
392 kmem_free(dl
, sizeof (*dl
));
396 * Look up an entry in a directory.
398 * NOTE: '.' and '..' are handled as special cases because
399 * no directory entries are actually stored for them. If this is
400 * the root of a filesystem, then '.zfs' is also treated as a
401 * special pseudo-directory.
404 zfs_dirlook(znode_t
*dzp
, char *name
, struct inode
**ipp
, int flags
,
405 int *deflg
, pathname_t
*rpnp
)
412 if (name
[0] == 0 || (name
[0] == '.' && name
[1] == 0)) {
415 } else if (name
[0] == '.' && name
[1] == '.' && name
[2] == 0) {
416 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
419 * If we are a snapshot mounted under .zfs, return
420 * the inode pointer for the snapshot directory.
422 if ((error
= sa_lookup(dzp
->z_sa_hdl
,
423 SA_ZPL_PARENT(zsb
), &parent
, sizeof (parent
))) != 0)
426 if (parent
== dzp
->z_id
&& zsb
->z_parent
!= zsb
) {
427 error
= zfsctl_root_lookup(zsb
->z_parent
->z_ctldir
,
428 "snapshot", ipp
, 0, kcred
, NULL
, NULL
);
431 rw_enter(&dzp
->z_parent_lock
, RW_READER
);
432 error
= zfs_zget(zsb
, parent
, &zp
);
435 rw_exit(&dzp
->z_parent_lock
);
436 } else if (zfs_has_ctldir(dzp
) && strcmp(name
, ZFS_CTLDIR_NAME
) == 0) {
437 *ipp
= zfsctl_root(dzp
);
441 zf
= ZEXISTS
| ZSHARED
;
442 if (flags
& FIGNORECASE
)
445 error
= zfs_dirent_lock(&dl
, dzp
, name
, &zp
, zf
, deflg
, rpnp
);
448 zfs_dirent_unlock(dl
);
449 dzp
->z_zn_prefetch
= B_TRUE
; /* enable prefetching */
454 if ((flags
& FIGNORECASE
) && rpnp
&& !error
)
455 (void) strlcpy(rpnp
->pn_buf
, name
, rpnp
->pn_bufsize
);
461 * unlinked Set (formerly known as the "delete queue") Error Handling
463 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
464 * don't specify the name of the entry that we will be manipulating. We
465 * also fib and say that we won't be adding any new entries to the
466 * unlinked set, even though we might (this is to lower the minimum file
467 * size that can be deleted in a full filesystem). So on the small
468 * chance that the nlink list is using a fat zap (ie. has more than
469 * 2000 entries), we *may* not pre-read a block that's needed.
470 * Therefore it is remotely possible for some of the assertions
471 * regarding the unlinked set below to fail due to i/o error. On a
472 * nondebug system, this will result in the space being leaked.
475 zfs_unlinked_add(znode_t
*zp
, dmu_tx_t
*tx
)
477 zfs_sb_t
*zsb
= ZTOZSB(zp
);
479 ASSERT(zp
->z_unlinked
);
480 ASSERT(zp
->z_links
== 0);
483 zap_add_int(zsb
->z_os
, zsb
->z_unlinkedobj
, zp
->z_id
, tx
));
487 * Delete the entire contents of a directory. Return a count
488 * of the number of entries that could not be deleted. If we encounter
489 * an error, return a count of at least one so that the directory stays
490 * in the unlinked set.
492 * NOTE: this function assumes that the directory is inactive,
493 * so there is no need to lock its entries before deletion.
494 * Also, it assumes the directory contents is *only* regular
498 zfs_purgedir(znode_t
*dzp
)
504 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
509 for (zap_cursor_init(&zc
, zsb
->z_os
, dzp
->z_id
);
510 (error
= zap_cursor_retrieve(&zc
, &zap
)) == 0;
511 zap_cursor_advance(&zc
)) {
512 error
= zfs_zget(zsb
,
513 ZFS_DIRENT_OBJ(zap
.za_first_integer
), &xzp
);
519 ASSERT(S_ISREG(ZTOI(xzp
)->i_mode
)||S_ISLNK(ZTOI(xzp
)->i_mode
));
521 tx
= dmu_tx_create(zsb
->z_os
);
522 dmu_tx_hold_sa(tx
, dzp
->z_sa_hdl
, B_FALSE
);
523 dmu_tx_hold_zap(tx
, dzp
->z_id
, FALSE
, zap
.za_name
);
524 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
525 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
526 /* Is this really needed ? */
527 zfs_sa_upgrade_txholds(tx
, xzp
);
528 error
= dmu_tx_assign(tx
, TXG_WAIT
);
535 bzero(&dl
, sizeof (dl
));
537 dl
.dl_name
= zap
.za_name
;
539 error
= zfs_link_destroy(&dl
, xzp
, tx
, 0, NULL
);
546 zap_cursor_fini(&zc
);
553 * Clean up any znodes that had no links when we either crashed or
554 * (force) umounted the file system.
557 zfs_unlinked_drain(zfs_sb_t
*zsb
)
561 dmu_object_info_t doi
;
566 * Iterate over the contents of the unlinked set.
568 for (zap_cursor_init(&zc
, zsb
->z_os
, zsb
->z_unlinkedobj
);
569 zap_cursor_retrieve(&zc
, &zap
) == 0;
570 zap_cursor_advance(&zc
)) {
573 * See what kind of object we have in list
576 error
= dmu_object_info(zsb
->z_os
, zap
.za_first_integer
, &doi
);
580 ASSERT((doi
.doi_type
== DMU_OT_PLAIN_FILE_CONTENTS
) ||
581 (doi
.doi_type
== DMU_OT_DIRECTORY_CONTENTS
));
583 * We need to re-mark these list entries for deletion,
584 * so we pull them back into core and set zp->z_unlinked.
586 error
= zfs_zget(zsb
, zap
.za_first_integer
, &zp
);
589 * We may pick up znodes that are already marked for deletion.
590 * This could happen during the purge of an extended attribute
591 * directory. All we need to do is skip over them, since they
592 * are already in the system marked z_unlinked.
597 zp
->z_unlinked
= B_TRUE
;
600 * If this is an attribute directory, purge its contents.
602 if (S_ISDIR(ZTOI(zp
)->i_mode
) && (zp
->z_pflags
& ZFS_XATTR
)) {
604 * We don't need to check the return value of
605 * zfs_purgedir here, because zfs_rmnode will just
606 * return this xattr directory to the unlinked set
607 * until all of its xattrs are gone.
609 (void) zfs_purgedir(zp
);
614 zap_cursor_fini(&zc
);
618 zfs_rmnode(znode_t
*zp
)
620 zfs_sb_t
*zsb
= ZTOZSB(zp
);
621 objset_t
*os
= zsb
->z_os
;
629 ASSERT(zp
->z_links
== 0);
630 ASSERT(atomic_read(&ZTOI(zp
)->i_count
) == 0);
633 * If this is an attribute directory, purge its contents.
635 if (S_ISDIR(ZTOI(zp
)->i_mode
) && (zp
->z_pflags
& ZFS_XATTR
)) {
636 error
= zap_count(os
, zp
->z_id
, &count
);
638 zfs_znode_dmu_fini(zp
);
646 * There are still directory entries in this xattr
647 * directory. Let zfs_unlinked_drain() deal with
648 * them to avoid deadlocking this process in the
649 * zfs_purgedir()->zfs_zget()->ilookup() callpath
650 * on the xattr inode's I_FREEING bit.
652 taskq
= dsl_pool_iput_taskq(dmu_objset_pool(os
));
653 taskq_dispatch(taskq
, (task_func_t
*)
654 zfs_unlinked_drain
, zsb
, TQ_SLEEP
);
656 zfs_znode_dmu_fini(zp
);
662 * Free up all the data in the file.
664 error
= dmu_free_long_range(os
, zp
->z_id
, 0, DMU_OBJECT_END
);
667 * Not enough space. Leave the file in the unlinked set.
669 zfs_znode_dmu_fini(zp
);
674 * If the file has extended attributes, we're going to unlink
677 error
= sa_lookup(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
),
678 &xattr_obj
, sizeof (xattr_obj
));
679 if (error
== 0 && xattr_obj
) {
680 error
= zfs_zget(zsb
, xattr_obj
, &xzp
);
684 acl_obj
= zfs_external_acl(zp
);
687 * Set up the final transaction.
689 tx
= dmu_tx_create(os
);
690 dmu_tx_hold_free(tx
, zp
->z_id
, 0, DMU_OBJECT_END
);
691 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, FALSE
, NULL
);
693 dmu_tx_hold_zap(tx
, zsb
->z_unlinkedobj
, TRUE
, NULL
);
694 dmu_tx_hold_sa(tx
, xzp
->z_sa_hdl
, B_FALSE
);
697 dmu_tx_hold_free(tx
, acl_obj
, 0, DMU_OBJECT_END
);
699 zfs_sa_upgrade_txholds(tx
, zp
);
700 error
= dmu_tx_assign(tx
, TXG_WAIT
);
703 * Not enough space to delete the file. Leave it in the
704 * unlinked set, leaking it until the fs is remounted (at
705 * which point we'll call zfs_unlinked_drain() to process it).
708 zfs_znode_dmu_fini(zp
);
714 mutex_enter(&xzp
->z_lock
);
715 xzp
->z_unlinked
= B_TRUE
; /* mark xzp for deletion */
716 xzp
->z_links
= 0; /* no more links to it */
717 VERIFY(0 == sa_update(xzp
->z_sa_hdl
, SA_ZPL_LINKS(zsb
),
718 &xzp
->z_links
, sizeof (xzp
->z_links
), tx
));
719 mutex_exit(&xzp
->z_lock
);
720 zfs_unlinked_add(xzp
, tx
);
723 /* Remove this znode from the unlinked set */
725 zap_remove_int(zsb
->z_os
, zsb
->z_unlinkedobj
, zp
->z_id
, tx
));
727 zfs_znode_delete(zp
, tx
);
736 zfs_dirent(znode_t
*zp
, uint64_t mode
)
738 uint64_t de
= zp
->z_id
;
740 if (ZTOZSB(zp
)->z_version
>= ZPL_VERSION_DIRENT_TYPE
)
741 de
|= IFTODT(mode
) << 60;
746 * Link zp into dl. Can only fail if zp has been unlinked.
749 zfs_link_create(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
)
751 znode_t
*dzp
= dl
->dl_dzp
;
752 zfs_sb_t
*zsb
= ZTOZSB(zp
);
754 int zp_is_dir
= S_ISDIR(ZTOI(zp
)->i_mode
);
755 sa_bulk_attr_t bulk
[5];
756 uint64_t mtime
[2], ctime
[2];
760 mutex_enter(&zp
->z_lock
);
762 if (!(flag
& ZRENAMING
)) {
763 if (zp
->z_unlinked
) { /* no new links to unlinked zp */
764 ASSERT(!(flag
& (ZNEW
| ZEXISTS
)));
765 mutex_exit(&zp
->z_lock
);
766 return (SET_ERROR(ENOENT
));
769 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
), NULL
,
770 &zp
->z_links
, sizeof (zp
->z_links
));
773 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_PARENT(zsb
), NULL
,
774 &dzp
->z_id
, sizeof (dzp
->z_id
));
775 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
776 &zp
->z_pflags
, sizeof (zp
->z_pflags
));
778 if (!(flag
& ZNEW
)) {
779 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
780 ctime
, sizeof (ctime
));
781 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
,
784 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
787 mutex_exit(&zp
->z_lock
);
789 mutex_enter(&dzp
->z_lock
);
791 dzp
->z_links
+= zp_is_dir
;
793 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
), NULL
,
794 &dzp
->z_size
, sizeof (dzp
->z_size
));
795 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
), NULL
,
796 &dzp
->z_links
, sizeof (dzp
->z_links
));
797 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
), NULL
,
798 mtime
, sizeof (mtime
));
799 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
), NULL
,
800 ctime
, sizeof (ctime
));
801 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
), NULL
,
802 &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
803 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
804 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
806 mutex_exit(&dzp
->z_lock
);
808 value
= zfs_dirent(zp
, zp
->z_mode
);
809 error
= zap_add(ZTOZSB(zp
)->z_os
, dzp
->z_id
, dl
->dl_name
,
817 zfs_dropname(zfs_dirlock_t
*dl
, znode_t
*zp
, znode_t
*dzp
, dmu_tx_t
*tx
,
822 if (ZTOZSB(zp
)->z_norm
) {
823 if (((ZTOZSB(zp
)->z_case
== ZFS_CASE_INSENSITIVE
) &&
824 (flag
& ZCIEXACT
)) ||
825 ((ZTOZSB(zp
)->z_case
== ZFS_CASE_MIXED
) &&
827 error
= zap_remove_norm(ZTOZSB(zp
)->z_os
,
828 dzp
->z_id
, dl
->dl_name
, MT_EXACT
, tx
);
830 error
= zap_remove_norm(ZTOZSB(zp
)->z_os
,
831 dzp
->z_id
, dl
->dl_name
, MT_FIRST
, tx
);
833 error
= zap_remove(ZTOZSB(zp
)->z_os
,
834 dzp
->z_id
, dl
->dl_name
, tx
);
841 * Unlink zp from dl, and mark zp for deletion if this was the last link. Can
842 * fail if zp is a mount point (EBUSY) or a non-empty directory (ENOTEMPTY).
843 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
844 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
845 * and it's the caller's job to do it.
848 zfs_link_destroy(zfs_dirlock_t
*dl
, znode_t
*zp
, dmu_tx_t
*tx
, int flag
,
849 boolean_t
*unlinkedp
)
851 znode_t
*dzp
= dl
->dl_dzp
;
852 zfs_sb_t
*zsb
= ZTOZSB(dzp
);
853 int zp_is_dir
= S_ISDIR(ZTOI(zp
)->i_mode
);
854 boolean_t unlinked
= B_FALSE
;
855 sa_bulk_attr_t bulk
[5];
856 uint64_t mtime
[2], ctime
[2];
861 dnlc_remove(ZTOI(dzp
), dl
->dl_name
);
862 #endif /* HAVE_DNLC */
864 if (!(flag
& ZRENAMING
)) {
865 mutex_enter(&zp
->z_lock
);
867 if (zp_is_dir
&& !zfs_dirempty(zp
)) {
868 mutex_exit(&zp
->z_lock
);
869 return (SET_ERROR(ENOTEMPTY
));
873 * If we get here, we are going to try to remove the object.
874 * First try removing the name from the directory; if that
875 * fails, return the error.
877 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
879 mutex_exit(&zp
->z_lock
);
883 if (zp
->z_links
<= zp_is_dir
) {
884 zfs_panic_recover("zfs: link count on %lu is %u, "
885 "should be at least %u", zp
->z_id
,
886 (int)zp
->z_links
, zp_is_dir
+ 1);
887 zp
->z_links
= zp_is_dir
+ 1;
889 if (--zp
->z_links
== zp_is_dir
) {
890 zp
->z_unlinked
= B_TRUE
;
894 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
),
895 NULL
, &ctime
, sizeof (ctime
));
896 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
),
897 NULL
, &zp
->z_pflags
, sizeof (zp
->z_pflags
));
898 zfs_tstamp_update_setup(zp
, STATE_CHANGED
, mtime
, ctime
,
901 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
),
902 NULL
, &zp
->z_links
, sizeof (zp
->z_links
));
903 error
= sa_bulk_update(zp
->z_sa_hdl
, bulk
, count
, tx
);
906 mutex_exit(&zp
->z_lock
);
908 error
= zfs_dropname(dl
, zp
, dzp
, tx
, flag
);
913 mutex_enter(&dzp
->z_lock
);
914 dzp
->z_size
--; /* one dirent removed */
915 dzp
->z_links
-= zp_is_dir
; /* ".." link from zp */
916 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_LINKS(zsb
),
917 NULL
, &dzp
->z_links
, sizeof (dzp
->z_links
));
918 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_SIZE(zsb
),
919 NULL
, &dzp
->z_size
, sizeof (dzp
->z_size
));
920 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_CTIME(zsb
),
921 NULL
, ctime
, sizeof (ctime
));
922 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_MTIME(zsb
),
923 NULL
, mtime
, sizeof (mtime
));
924 SA_ADD_BULK_ATTR(bulk
, count
, SA_ZPL_FLAGS(zsb
),
925 NULL
, &dzp
->z_pflags
, sizeof (dzp
->z_pflags
));
926 zfs_tstamp_update_setup(dzp
, CONTENT_MODIFIED
, mtime
, ctime
, B_TRUE
);
927 error
= sa_bulk_update(dzp
->z_sa_hdl
, bulk
, count
, tx
);
929 mutex_exit(&dzp
->z_lock
);
931 if (unlinkedp
!= NULL
)
932 *unlinkedp
= unlinked
;
934 zfs_unlinked_add(zp
, tx
);
940 * Indicate whether the directory is empty. Works with or without z_lock
941 * held, but can only be consider a hint in the latter case. Returns true
942 * if only "." and ".." remain and there's no work in progress.
945 zfs_dirempty(znode_t
*dzp
)
947 return (dzp
->z_size
== 2 && dzp
->z_dirlocks
== 0);
951 zfs_make_xattrdir(znode_t
*zp
, vattr_t
*vap
, struct inode
**xipp
, cred_t
*cr
)
953 zfs_sb_t
*zsb
= ZTOZSB(zp
);
957 zfs_acl_ids_t acl_ids
;
958 boolean_t fuid_dirtied
;
965 if ((error
= zfs_zaccess(zp
, ACE_WRITE_NAMED_ATTRS
, 0, B_FALSE
, cr
)))
968 if ((error
= zfs_acl_ids_create(zp
, IS_XATTR
, vap
, cr
, NULL
,
971 if (zfs_acl_ids_overquota(zsb
, &acl_ids
)) {
972 zfs_acl_ids_free(&acl_ids
);
973 return (SET_ERROR(EDQUOT
));
976 tx
= dmu_tx_create(zsb
->z_os
);
977 dmu_tx_hold_sa_create(tx
, acl_ids
.z_aclp
->z_acl_bytes
+
978 ZFS_SA_BASE_ATTR_SIZE
);
979 dmu_tx_hold_sa(tx
, zp
->z_sa_hdl
, B_TRUE
);
980 dmu_tx_hold_zap(tx
, DMU_NEW_OBJECT
, FALSE
, NULL
);
981 fuid_dirtied
= zsb
->z_fuid_dirty
;
983 zfs_fuid_txhold(zsb
, tx
);
984 error
= dmu_tx_assign(tx
, TXG_WAIT
);
986 zfs_acl_ids_free(&acl_ids
);
990 zfs_mknode(zp
, vap
, tx
, cr
, IS_XATTR
, &xzp
, &acl_ids
);
993 zfs_fuid_sync(zsb
, tx
);
996 error
= sa_lookup(xzp
->z_sa_hdl
, SA_ZPL_PARENT(zsb
),
997 &parent
, sizeof (parent
));
998 ASSERT(error
== 0 && parent
== zp
->z_id
);
1001 VERIFY(0 == sa_update(zp
->z_sa_hdl
, SA_ZPL_XATTR(zsb
), &xzp
->z_id
,
1002 sizeof (xzp
->z_id
), tx
));
1004 (void) zfs_log_create(zsb
->z_log
, tx
, TX_MKXATTR
, zp
,
1005 xzp
, "", NULL
, acl_ids
.z_fuidp
, vap
);
1007 zfs_acl_ids_free(&acl_ids
);
1016 * Return a znode for the extended attribute directory for zp.
1017 * ** If the directory does not already exist, it is created **
1019 * IN: zp - znode to obtain attribute directory from
1020 * cr - credentials of caller
1021 * flags - flags from the VOP_LOOKUP call
1023 * OUT: xipp - pointer to extended attribute znode
1025 * RETURN: 0 on success
1026 * error number on failure
1029 zfs_get_xattrdir(znode_t
*zp
, struct inode
**xipp
, cred_t
*cr
, int flags
)
1031 zfs_sb_t
*zsb
= ZTOZSB(zp
);
1037 error
= zfs_dirent_lock(&dl
, zp
, "", &xzp
, ZXATTR
, NULL
, NULL
);
1043 zfs_dirent_unlock(dl
);
1047 if (!(flags
& CREATE_XATTR_DIR
)) {
1048 zfs_dirent_unlock(dl
);
1049 return (SET_ERROR(ENOENT
));
1052 if (zfs_is_readonly(zsb
)) {
1053 zfs_dirent_unlock(dl
);
1054 return (SET_ERROR(EROFS
));
1058 * The ability to 'create' files in an attribute
1059 * directory comes from the write_xattr permission on the base file.
1061 * The ability to 'search' an attribute directory requires
1062 * read_xattr permission on the base file.
1064 * Once in a directory the ability to read/write attributes
1065 * is controlled by the permissions on the attribute file.
1067 va
.va_mask
= ATTR_MODE
| ATTR_UID
| ATTR_GID
;
1068 va
.va_mode
= S_IFDIR
| S_ISVTX
| 0777;
1069 zfs_fuid_map_ids(zp
, cr
, &va
.va_uid
, &va
.va_gid
);
1071 va
.va_dentry
= NULL
;
1072 error
= zfs_make_xattrdir(zp
, &va
, xipp
, cr
);
1073 zfs_dirent_unlock(dl
);
1075 if (error
== ERESTART
) {
1076 /* NB: we already did dmu_tx_wait() if necessary */
1084 * Decide whether it is okay to remove within a sticky directory.
1086 * In sticky directories, write access is not sufficient;
1087 * you can remove entries from a directory only if:
1089 * you own the directory,
1090 * you own the entry,
1091 * the entry is a plain file and you have write access,
1092 * or you are privileged (checked in secpolicy...).
1094 * The function returns 0 if remove access is granted.
1097 zfs_sticky_remove_access(znode_t
*zdp
, znode_t
*zp
, cred_t
*cr
)
1102 zfs_sb_t
*zsb
= ZTOZSB(zdp
);
1107 if ((zdp
->z_mode
& S_ISVTX
) == 0)
1110 downer
= zfs_fuid_map_id(zsb
, zdp
->z_uid
, cr
, ZFS_OWNER
);
1111 fowner
= zfs_fuid_map_id(zsb
, zp
->z_uid
, cr
, ZFS_OWNER
);
1113 if ((uid
= crgetuid(cr
)) == downer
|| uid
== fowner
||
1114 (S_ISDIR(ZTOI(zp
)->i_mode
) &&
1115 zfs_zaccess(zp
, ACE_WRITE_DATA
, 0, B_FALSE
, cr
) == 0))
1118 return (secpolicy_vnode_remove(cr
));