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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
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>
37 #include <sys/cmn_err.h>
38 #include <sys/errno.h>
40 #include <sys/unistd.h>
41 #include <sys/sunddi.h>
42 #include <sys/random.h>
43 #include <sys/policy.h>
44 #include <sys/kcondvar.h>
45 #include <sys/callb.h>
47 #include <sys/zfs_dir.h>
48 #include <sys/zfs_acl.h>
49 #include <sys/fs/zfs.h>
52 #include <sys/atomic.h>
53 #include <sys/zfs_ctldir.h>
54 #include <sys/zfs_fuid.h>
56 #include <sys/extdirent.h>
59 * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups
60 * of names after deciding which is the appropriate lookup interface.
63 zfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, char *name, boolean_t exact,
64 boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid)
69 matchtype_t mt = MT_FIRST;
70 boolean_t conflict = B_FALSE;
76 bufsz = rpnp->pn_bufsize;
81 * In the non-mixed case we only expect there would ever
82 * be one match, but we need to use the normalizing lookup.
84 error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1,
85 zoid, mt, buf, bufsz, &conflict);
86 if (!error && deflags)
87 *deflags = conflict ? ED_CASE_CONFLICT : 0;
89 error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid);
91 *zoid = ZFS_DIRENT_OBJ(*zoid);
93 if (error == ENOENT && update)
94 dnlc_update(ZTOV(dzp), name, DNLC_NO_VNODE);
100 * Lock a directory entry. A dirlock on <dzp, name> protects that name
101 * in dzp's directory zap object. As long as you hold a dirlock, you can
102 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
103 * can change the zap entry for (i.e. link or unlink) this name.
106 * dzp - znode for directory
107 * name - name of entry to lock
108 * flag - ZNEW: if the entry already exists, fail with EEXIST.
109 * ZEXISTS: if the entry does not exist, fail with ENOENT.
110 * ZSHARED: allow concurrent access with other ZSHARED callers.
111 * ZXATTR: we want dzp's xattr directory
112 * ZCILOOK: On a mixed sensitivity file system,
113 * this lookup should be case-insensitive.
114 * ZCIEXACT: On a purely case-insensitive file system,
115 * this lookup should be case-sensitive.
116 * ZRENAMING: we are locking for renaming, force narrow locks
117 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
118 * current thread already holds it.
121 * zpp - pointer to the znode for the entry (NULL if there isn't one)
122 * dlpp - pointer to the dirlock for this entry (NULL on error)
123 * direntflags - (case-insensitive lookup only)
124 * flags if multiple case-sensitive matches exist in directory
125 * realpnp - (case-insensitive lookup only)
126 * actual name matched within the directory
128 * Return value: 0 on success or errno on failure.
130 * NOTE: Always checks for, and rejects, '.' and '..'.
131 * NOTE: For case-insensitive file systems we take wide locks (see below),
132 * but return znode pointers to a single match.
135 zfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp,
136 int flag, int *direntflags, pathname_t *realpnp)
138 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
151 * Verify that we are not trying to lock '.', '..', or '.zfs'
153 if (name[0] == '.' &&
154 (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')) ||
155 zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0)
159 * Case sensitivity and normalization preferences are set when
160 * the file system is created. These are stored in the
161 * zfsvfs->z_case and zfsvfs->z_norm fields. These choices
162 * affect what vnodes can be cached in the DNLC, how we
163 * perform zap lookups, and the "width" of our dirlocks.
165 * A normal dirlock locks a single name. Note that with
166 * normalization a name can be composed multiple ways, but
167 * when normalized, these names all compare equal. A wide
168 * dirlock locks multiple names. We need these when the file
169 * system is supporting mixed-mode access. It is sometimes
170 * necessary to lock all case permutations of file name at
171 * once so that simultaneous case-insensitive/case-sensitive
172 * behaves as rationally as possible.
176 * Decide if exact matches should be requested when performing
177 * a zap lookup on file systems supporting case-insensitive
181 ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE) && (flag & ZCIEXACT)) ||
182 ((zfsvfs->z_case == ZFS_CASE_MIXED) && !(flag & ZCILOOK));
185 * Only look in or update the DNLC if we are looking for the
186 * name on a file system that does not require normalization
187 * or case folding. We can also look there if we happen to be
188 * on a non-normalizing, mixed sensitivity file system IF we
189 * are looking for the exact name.
191 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
192 * case for performance improvement?
194 update = !zfsvfs->z_norm ||
195 ((zfsvfs->z_case == ZFS_CASE_MIXED) &&
196 !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK));
199 * ZRENAMING indicates we are in a situation where we should
200 * take narrow locks regardless of the file system's
201 * preferences for normalizing and case folding. This will
202 * prevent us deadlocking trying to grab the same wide lock
203 * twice if the two names happen to be case-insensitive
206 if (flag & ZRENAMING)
209 cmpflags = zfsvfs->z_norm;
212 * Wait until there are no locks on this name.
214 * Don't grab the the lock if it is already held. However, cannot
215 * have both ZSHARED and ZHAVELOCK together.
217 ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK));
218 if (!(flag & ZHAVELOCK))
219 rw_enter(&dzp->z_name_lock, RW_READER);
221 mutex_enter(&dzp->z_lock);
223 if (dzp->z_unlinked) {
224 mutex_exit(&dzp->z_lock);
225 if (!(flag & ZHAVELOCK))
226 rw_exit(&dzp->z_name_lock);
229 for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) {
230 if ((u8_strcmp(name, dl->dl_name, 0, cmpflags,
231 U8_UNICODE_LATEST, &error) == 0) || error != 0)
235 mutex_exit(&dzp->z_lock);
236 if (!(flag & ZHAVELOCK))
237 rw_exit(&dzp->z_name_lock);
242 * Allocate a new dirlock and add it to the list.
244 dl = kmem_alloc(sizeof (zfs_dirlock_t), KM_SLEEP);
245 cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL);
251 dl->dl_next = dzp->z_dirlocks;
252 dzp->z_dirlocks = dl;
255 if ((flag & ZSHARED) && dl->dl_sharecnt != 0)
257 cv_wait(&dl->dl_cv, &dzp->z_lock);
261 * If the z_name_lock was NOT held for this dirlock record it.
263 if (flag & ZHAVELOCK)
266 if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) {
268 * We're the second shared reference to dl. Make a copy of
269 * dl_name in case the first thread goes away before we do.
270 * Note that we initialize the new name before storing its
271 * pointer into dl_name, because the first thread may load
272 * dl->dl_name at any time. He'll either see the old value,
273 * which is his, or the new shared copy; either is OK.
275 dl->dl_namesize = strlen(dl->dl_name) + 1;
276 name = kmem_alloc(dl->dl_namesize, KM_SLEEP);
277 bcopy(dl->dl_name, name, dl->dl_namesize);
281 mutex_exit(&dzp->z_lock);
284 * We have a dirlock on the name. (Note that it is the dirlock,
285 * not the dzp's z_lock, that protects the name in the zap object.)
286 * See if there's an object by this name; if so, put a hold on it.
289 zoid = dzp->z_phys->zp_xattr;
290 error = (zoid == 0 ? ENOENT : 0);
293 vp = dnlc_lookup(ZTOV(dzp), name);
294 if (vp == DNLC_NO_VNODE) {
299 zfs_dirent_unlock(dl);
307 error = zfs_match_find(zfsvfs, dzp, name, exact,
308 update, direntflags, realpnp, &zoid);
312 if (error != ENOENT || (flag & ZEXISTS)) {
313 zfs_dirent_unlock(dl);
318 zfs_dirent_unlock(dl);
321 error = zfs_zget(zfsvfs, zoid, zpp);
323 zfs_dirent_unlock(dl);
326 if (!(flag & ZXATTR) && update)
327 dnlc_update(ZTOV(dzp), name, ZTOV(*zpp));
336 * Unlock this directory entry and wake anyone who was waiting for it.
339 zfs_dirent_unlock(zfs_dirlock_t *dl)
341 znode_t *dzp = dl->dl_dzp;
342 zfs_dirlock_t **prev_dl, *cur_dl;
344 mutex_enter(&dzp->z_lock);
346 if (!dl->dl_namelock)
347 rw_exit(&dzp->z_name_lock);
349 if (dl->dl_sharecnt > 1) {
351 mutex_exit(&dzp->z_lock);
354 prev_dl = &dzp->z_dirlocks;
355 while ((cur_dl = *prev_dl) != dl)
356 prev_dl = &cur_dl->dl_next;
357 *prev_dl = dl->dl_next;
358 cv_broadcast(&dl->dl_cv);
359 mutex_exit(&dzp->z_lock);
361 if (dl->dl_namesize != 0)
362 kmem_free(dl->dl_name, dl->dl_namesize);
363 cv_destroy(&dl->dl_cv);
364 kmem_free(dl, sizeof (*dl));
368 * Look up an entry in a directory.
370 * NOTE: '.' and '..' are handled as special cases because
371 * no directory entries are actually stored for them. If this is
372 * the root of a filesystem, then '.zfs' is also treated as a
373 * special pseudo-directory.
376 zfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp, int flags,
377 int *deflg, pathname_t *rpnp)
383 if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
386 } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
387 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
389 * If we are a snapshot mounted under .zfs, return
390 * the vp for the snapshot directory.
392 if (dzp->z_phys->zp_parent == dzp->z_id &&
393 zfsvfs->z_parent != zfsvfs) {
394 error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
395 "snapshot", vpp, NULL, 0, NULL, kcred,
399 rw_enter(&dzp->z_parent_lock, RW_READER);
400 error = zfs_zget(zfsvfs, dzp->z_phys->zp_parent, &zp);
403 rw_exit(&dzp->z_parent_lock);
404 } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
405 *vpp = zfsctl_root(dzp);
409 zf = ZEXISTS | ZSHARED;
410 if (flags & FIGNORECASE)
413 error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
416 zfs_dirent_unlock(dl);
417 dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
422 if ((flags & FIGNORECASE) && rpnp && !error)
423 (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
429 * unlinked Set (formerly known as the "delete queue") Error Handling
431 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
432 * don't specify the name of the entry that we will be manipulating. We
433 * also fib and say that we won't be adding any new entries to the
434 * unlinked set, even though we might (this is to lower the minimum file
435 * size that can be deleted in a full filesystem). So on the small
436 * chance that the nlink list is using a fat zap (ie. has more than
437 * 2000 entries), we *may* not pre-read a block that's needed.
438 * Therefore it is remotely possible for some of the assertions
439 * regarding the unlinked set below to fail due to i/o error. On a
440 * nondebug system, this will result in the space being leaked.
443 zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx)
445 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
447 ASSERT(zp->z_unlinked);
448 ASSERT3U(zp->z_phys->zp_links, ==, 0);
451 zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
455 * Clean up any znodes that had no links when we either crashed or
456 * (force) umounted the file system.
459 zfs_unlinked_drain(zfsvfs_t *zfsvfs)
463 dmu_object_info_t doi;
468 * Interate over the contents of the unlinked set.
470 for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj);
471 zap_cursor_retrieve(&zc, &zap) == 0;
472 zap_cursor_advance(&zc)) {
475 * See what kind of object we have in list
478 error = dmu_object_info(zfsvfs->z_os,
479 zap.za_first_integer, &doi);
483 ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) ||
484 (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS));
486 * We need to re-mark these list entries for deletion,
487 * so we pull them back into core and set zp->z_unlinked.
489 error = zfs_zget(zfsvfs, zap.za_first_integer, &zp);
492 * We may pick up znodes that are already marked for deletion.
493 * This could happen during the purge of an extended attribute
494 * directory. All we need to do is skip over them, since they
495 * are already in the system marked z_unlinked.
500 zp->z_unlinked = B_TRUE;
503 zap_cursor_fini(&zc);
507 * Delete the entire contents of a directory. Return a count
508 * of the number of entries that could not be deleted. If we encounter
509 * an error, return a count of at least one so that the directory stays
510 * in the unlinked set.
512 * NOTE: this function assumes that the directory is inactive,
513 * so there is no need to lock its entries before deletion.
514 * Also, it assumes the directory contents is *only* regular
518 zfs_purgedir(znode_t *dzp)
524 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
529 for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id);
530 (error = zap_cursor_retrieve(&zc, &zap)) == 0;
531 zap_cursor_advance(&zc)) {
532 error = zfs_zget(zfsvfs,
533 ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp);
539 ASSERT((ZTOV(xzp)->v_type == VREG) ||
540 (ZTOV(xzp)->v_type == VLNK));
542 tx = dmu_tx_create(zfsvfs->z_os);
543 dmu_tx_hold_bonus(tx, dzp->z_id);
544 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name);
545 dmu_tx_hold_bonus(tx, xzp->z_id);
546 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
547 error = dmu_tx_assign(tx, TXG_WAIT);
554 bzero(&dl, sizeof (dl));
556 dl.dl_name = zap.za_name;
558 error = zfs_link_destroy(&dl, xzp, tx, 0, NULL);
565 zap_cursor_fini(&zc);
572 zfs_rmnode(znode_t *zp)
574 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
575 objset_t *os = zfsvfs->z_os;
581 ASSERT(zp->z_phys->zp_links == 0);
584 * If this is an attribute directory, purge its contents.
586 if (ZTOV(zp) != NULL && ZTOV(zp)->v_type == VDIR &&
587 (zp->z_phys->zp_flags & ZFS_XATTR)) {
588 if (zfs_purgedir(zp) != 0) {
590 * Not enough space to delete some xattrs.
591 * Leave it in the unlinked set.
593 zfs_znode_dmu_fini(zp);
600 * Free up all the data in the file.
602 error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
605 * Not enough space. Leave the file in the unlinked set.
607 zfs_znode_dmu_fini(zp);
613 * If the file has extended attributes, we're going to unlink
616 if (zp->z_phys->zp_xattr) {
617 error = zfs_zget(zfsvfs, zp->z_phys->zp_xattr, &xzp);
621 acl_obj = zp->z_phys->zp_acl.z_acl_extern_obj;
624 * Set up the final transaction.
626 tx = dmu_tx_create(os);
627 dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
628 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
630 dmu_tx_hold_bonus(tx, xzp->z_id);
631 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
634 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
635 error = dmu_tx_assign(tx, TXG_WAIT);
638 * Not enough space to delete the file. Leave it in the
639 * unlinked set, leaking it until the fs is remounted (at
640 * which point we'll call zfs_unlinked_drain() to process it).
643 zfs_znode_dmu_fini(zp);
649 dmu_buf_will_dirty(xzp->z_dbuf, tx);
650 mutex_enter(&xzp->z_lock);
651 xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */
652 xzp->z_phys->zp_links = 0; /* no more links to it */
653 mutex_exit(&xzp->z_lock);
654 zfs_unlinked_add(xzp, tx);
657 /* Remove this znode from the unlinked set */
659 zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
661 zfs_znode_delete(zp, tx);
670 zfs_dirent(znode_t *zp)
672 uint64_t de = zp->z_id;
673 if (zp->z_zfsvfs->z_version >= ZPL_VERSION_DIRENT_TYPE)
674 de |= IFTODT((zp)->z_phys->zp_mode) << 60;
679 * Link zp into dl. Can only fail if zp has been unlinked.
682 zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
684 znode_t *dzp = dl->dl_dzp;
685 vnode_t *vp = ZTOV(zp);
687 int zp_is_dir = (vp->v_type == VDIR);
690 dmu_buf_will_dirty(zp->z_dbuf, tx);
691 mutex_enter(&zp->z_lock);
693 if (!(flag & ZRENAMING)) {
694 if (zp->z_unlinked) { /* no new links to unlinked zp */
695 ASSERT(!(flag & (ZNEW | ZEXISTS)));
696 mutex_exit(&zp->z_lock);
699 zp->z_phys->zp_links++;
701 zp->z_phys->zp_parent = dzp->z_id; /* dzp is now zp's parent */
704 zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
705 mutex_exit(&zp->z_lock);
707 dmu_buf_will_dirty(dzp->z_dbuf, tx);
708 mutex_enter(&dzp->z_lock);
709 dzp->z_phys->zp_size++; /* one dirent added */
710 dzp->z_phys->zp_links += zp_is_dir; /* ".." link from zp */
711 zfs_time_stamper_locked(dzp, CONTENT_MODIFIED, tx);
712 mutex_exit(&dzp->z_lock);
714 value = zfs_dirent(zp);
715 error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name,
719 dnlc_update(ZTOV(dzp), dl->dl_name, vp);
725 * Unlink zp from dl, and mark zp for deletion if this was the last link.
726 * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
727 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
728 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
729 * and it's the caller's job to do it.
732 zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
733 boolean_t *unlinkedp)
735 znode_t *dzp = dl->dl_dzp;
736 vnode_t *vp = ZTOV(zp);
737 int zp_is_dir = (vp->v_type == VDIR);
738 boolean_t unlinked = B_FALSE;
741 dnlc_remove(ZTOV(dzp), dl->dl_name);
743 if (!(flag & ZRENAMING)) {
744 dmu_buf_will_dirty(zp->z_dbuf, tx);
746 if (vn_vfswlock(vp)) /* prevent new mounts on zp */
749 if (vn_ismntpt(vp)) { /* don't remove mount point */
754 mutex_enter(&zp->z_lock);
755 if (zp_is_dir && !zfs_dirempty(zp)) { /* dir not empty */
756 mutex_exit(&zp->z_lock);
760 if (zp->z_phys->zp_links <= zp_is_dir) {
761 zfs_panic_recover("zfs: link count on vnode %p is %u, "
762 "should be at least %u", zp->z_vnode,
763 (int)zp->z_phys->zp_links,
765 zp->z_phys->zp_links = zp_is_dir + 1;
767 if (--zp->z_phys->zp_links == zp_is_dir) {
768 zp->z_unlinked = B_TRUE;
769 zp->z_phys->zp_links = 0;
772 zfs_time_stamper_locked(zp, STATE_CHANGED, tx);
774 mutex_exit(&zp->z_lock);
778 dmu_buf_will_dirty(dzp->z_dbuf, tx);
779 mutex_enter(&dzp->z_lock);
780 dzp->z_phys->zp_size--; /* one dirent removed */
781 dzp->z_phys->zp_links -= zp_is_dir; /* ".." link from zp */
782 zfs_time_stamper_locked(dzp, CONTENT_MODIFIED, tx);
783 mutex_exit(&dzp->z_lock);
785 if (zp->z_zfsvfs->z_norm) {
786 if (((zp->z_zfsvfs->z_case == ZFS_CASE_INSENSITIVE) &&
787 (flag & ZCIEXACT)) ||
788 ((zp->z_zfsvfs->z_case == ZFS_CASE_MIXED) &&
790 error = zap_remove_norm(zp->z_zfsvfs->z_os,
791 dzp->z_id, dl->dl_name, MT_EXACT, tx);
793 error = zap_remove_norm(zp->z_zfsvfs->z_os,
794 dzp->z_id, dl->dl_name, MT_FIRST, tx);
796 error = zap_remove(zp->z_zfsvfs->z_os,
797 dzp->z_id, dl->dl_name, tx);
801 if (unlinkedp != NULL)
802 *unlinkedp = unlinked;
804 zfs_unlinked_add(zp, tx);
810 * Indicate whether the directory is empty. Works with or without z_lock
811 * held, but can only be consider a hint in the latter case. Returns true
812 * if only "." and ".." remain and there's no work in progress.
815 zfs_dirempty(znode_t *dzp)
817 return (dzp->z_phys->zp_size == 2 && dzp->z_dirlocks == 0);
821 zfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr)
823 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
827 zfs_acl_ids_t acl_ids;
828 boolean_t fuid_dirtied;
833 * In FreeBSD, access checking for creating an EA is being done
834 * in zfs_setextattr(),
837 if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))
841 if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
844 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
845 zfs_acl_ids_free(&acl_ids);
849 tx = dmu_tx_create(zfsvfs->z_os);
850 dmu_tx_hold_bonus(tx, zp->z_id);
851 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
852 fuid_dirtied = zfsvfs->z_fuid_dirty;
854 zfs_fuid_txhold(zfsvfs, tx);
855 error = dmu_tx_assign(tx, TXG_NOWAIT);
857 zfs_acl_ids_free(&acl_ids);
858 if (error == ERESTART)
863 zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, 0, &acl_ids);
866 zfs_fuid_sync(zfsvfs, tx);
868 ASSERT(xzp->z_phys->zp_parent == zp->z_id);
869 dmu_buf_will_dirty(zp->z_dbuf, tx);
870 zp->z_phys->zp_xattr = xzp->z_id;
872 (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
873 xzp, "", NULL, acl_ids.z_fuidp, vap);
875 zfs_acl_ids_free(&acl_ids);
884 * Return a znode for the extended attribute directory for zp.
885 * ** If the directory does not already exist, it is created **
887 * IN: zp - znode to obtain attribute directory from
888 * cr - credentials of caller
889 * flags - flags from the VOP_LOOKUP call
891 * OUT: xzpp - pointer to extended attribute znode
893 * RETURN: 0 on success
894 * error number on failure
897 zfs_get_xattrdir(znode_t *zp, vnode_t **xvpp, cred_t *cr, int flags)
899 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
905 error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL);
911 zfs_dirent_unlock(dl);
915 ASSERT(zp->z_phys->zp_xattr == 0);
917 if (!(flags & CREATE_XATTR_DIR)) {
918 zfs_dirent_unlock(dl);
926 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
927 zfs_dirent_unlock(dl);
932 * The ability to 'create' files in an attribute
933 * directory comes from the write_xattr permission on the base file.
935 * The ability to 'search' an attribute directory requires
936 * read_xattr permission on the base file.
938 * Once in a directory the ability to read/write attributes
939 * is controlled by the permissions on the attribute file.
941 va.va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID;
943 va.va_mode = S_IFDIR | S_ISVTX | 0777;
944 zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid);
946 error = zfs_make_xattrdir(zp, &va, xvpp, cr);
947 zfs_dirent_unlock(dl);
949 if (error == ERESTART) {
950 /* NB: we already did dmu_tx_wait() if necessary */
954 VOP_UNLOCK(*xvpp, 0);
960 * Decide whether it is okay to remove within a sticky directory.
962 * In sticky directories, write access is not sufficient;
963 * you can remove entries from a directory only if:
965 * you own the directory,
967 * the entry is a plain file and you have write access,
968 * or you are privileged (checked in secpolicy...).
970 * The function returns 0 if remove access is granted.
973 zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
978 zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
980 if (zdp->z_zfsvfs->z_replay)
983 if ((zdp->z_phys->zp_mode & S_ISVTX) == 0)
986 downer = zfs_fuid_map_id(zfsvfs, zdp->z_phys->zp_uid, cr, ZFS_OWNER);
987 fowner = zfs_fuid_map_id(zfsvfs, zp->z_phys->zp_uid, cr, ZFS_OWNER);
989 if ((uid = crgetuid(cr)) == downer || uid == fowner ||
990 (ZTOV(zp)->v_type == VREG &&
991 zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
994 return (secpolicy_vnode_remove(ZTOV(zp), cr));