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.
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/zfs_sa.h>
58 #include <sys/extdirent.h>
61 * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups
62 * of names after deciding which is the appropriate lookup interface.
65 zfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, char *name, boolean_t exact,
66 boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid)
71 matchtype_t mt = MT_FIRST;
72 boolean_t conflict = B_FALSE;
78 bufsz = rpnp->pn_bufsize;
83 * In the non-mixed case we only expect there would ever
84 * be one match, but we need to use the normalizing lookup.
86 error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1,
87 zoid, mt, buf, bufsz, &conflict);
88 if (!error && deflags)
89 *deflags = conflict ? ED_CASE_CONFLICT : 0;
91 error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid);
93 *zoid = ZFS_DIRENT_OBJ(*zoid);
95 if (error == ENOENT && update)
96 dnlc_update(ZTOV(dzp), name, DNLC_NO_VNODE);
102 * Lock a directory entry. A dirlock on <dzp, name> protects that name
103 * in dzp's directory zap object. As long as you hold a dirlock, you can
104 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
105 * can change the zap entry for (i.e. link or unlink) this name.
108 * dzp - znode for directory
109 * name - name of entry to lock
110 * flag - ZNEW: if the entry already exists, fail with EEXIST.
111 * ZEXISTS: if the entry does not exist, fail with ENOENT.
112 * ZSHARED: allow concurrent access with other ZSHARED callers.
113 * ZXATTR: we want dzp's xattr directory
114 * ZCILOOK: On a mixed sensitivity file system,
115 * this lookup should be case-insensitive.
116 * ZCIEXACT: On a purely case-insensitive file system,
117 * this lookup should be case-sensitive.
118 * ZRENAMING: we are locking for renaming, force narrow locks
119 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
120 * current thread already holds it.
123 * zpp - pointer to the znode for the entry (NULL if there isn't one)
124 * dlpp - pointer to the dirlock for this entry (NULL on error)
125 * direntflags - (case-insensitive lookup only)
126 * flags if multiple case-sensitive matches exist in directory
127 * realpnp - (case-insensitive lookup only)
128 * actual name matched within the directory
130 * Return value: 0 on success or errno on failure.
132 * NOTE: Always checks for, and rejects, '.' and '..'.
133 * NOTE: For case-insensitive file systems we take wide locks (see below),
134 * but return znode pointers to a single match.
137 zfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp,
138 int flag, int *direntflags, pathname_t *realpnp)
140 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
153 * Verify that we are not trying to lock '.', '..', or '.zfs'
155 if (name[0] == '.' &&
156 (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')) ||
157 zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0)
158 return (SET_ERROR(EEXIST));
161 * Case sensitivity and normalization preferences are set when
162 * the file system is created. These are stored in the
163 * zfsvfs->z_case and zfsvfs->z_norm fields. These choices
164 * affect what vnodes can be cached in the DNLC, how we
165 * perform zap lookups, and the "width" of our dirlocks.
167 * A normal dirlock locks a single name. Note that with
168 * normalization a name can be composed multiple ways, but
169 * when normalized, these names all compare equal. A wide
170 * dirlock locks multiple names. We need these when the file
171 * system is supporting mixed-mode access. It is sometimes
172 * necessary to lock all case permutations of file name at
173 * once so that simultaneous case-insensitive/case-sensitive
174 * behaves as rationally as possible.
178 * Decide if exact matches should be requested when performing
179 * a zap lookup on file systems supporting case-insensitive
183 ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE) && (flag & ZCIEXACT)) ||
184 ((zfsvfs->z_case == ZFS_CASE_MIXED) && !(flag & ZCILOOK));
187 * Only look in or update the DNLC if we are looking for the
188 * name on a file system that does not require normalization
189 * or case folding. We can also look there if we happen to be
190 * on a non-normalizing, mixed sensitivity file system IF we
191 * are looking for the exact name.
193 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
194 * case for performance improvement?
196 update = !zfsvfs->z_norm ||
197 ((zfsvfs->z_case == ZFS_CASE_MIXED) &&
198 !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK));
201 * ZRENAMING indicates we are in a situation where we should
202 * take narrow locks regardless of the file system's
203 * preferences for normalizing and case folding. This will
204 * prevent us deadlocking trying to grab the same wide lock
205 * twice if the two names happen to be case-insensitive
208 if (flag & ZRENAMING)
211 cmpflags = zfsvfs->z_norm;
214 * Wait until there are no locks on this name.
216 * Don't grab the the lock if it is already held. However, cannot
217 * have both ZSHARED and ZHAVELOCK together.
219 ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK));
220 if (!(flag & ZHAVELOCK))
221 rw_enter(&dzp->z_name_lock, RW_READER);
223 mutex_enter(&dzp->z_lock);
225 if (dzp->z_unlinked) {
226 mutex_exit(&dzp->z_lock);
227 if (!(flag & ZHAVELOCK))
228 rw_exit(&dzp->z_name_lock);
229 return (SET_ERROR(ENOENT));
231 for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) {
232 if ((u8_strcmp(name, dl->dl_name, 0, cmpflags,
233 U8_UNICODE_LATEST, &error) == 0) || error != 0)
237 mutex_exit(&dzp->z_lock);
238 if (!(flag & ZHAVELOCK))
239 rw_exit(&dzp->z_name_lock);
240 return (SET_ERROR(ENOENT));
246 * Allocate a new dirlock and add it to the list.
248 namesize = strlen(name) + 1;
249 dl = kmem_alloc(sizeof (zfs_dirlock_t) + namesize,
251 cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL);
252 dl->dl_name = (char *)(dl + 1);
253 bcopy(name, dl->dl_name, namesize);
256 dl->dl_namesize = namesize;
258 dl->dl_next = dzp->z_dirlocks;
259 dzp->z_dirlocks = dl;
262 if ((flag & ZSHARED) && dl->dl_sharecnt != 0)
264 cv_wait(&dl->dl_cv, &dzp->z_lock);
268 * If the z_name_lock was NOT held for this dirlock record it.
270 if (flag & ZHAVELOCK)
276 mutex_exit(&dzp->z_lock);
279 * We have a dirlock on the name. (Note that it is the dirlock,
280 * not the dzp's z_lock, that protects the name in the zap object.)
281 * See if there's an object by this name; if so, put a hold on it.
284 error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid,
287 error = (zoid == 0 ? ENOENT : 0);
290 vp = dnlc_lookup(ZTOV(dzp), name);
291 if (vp == DNLC_NO_VNODE) {
293 error = SET_ERROR(ENOENT);
296 zfs_dirent_unlock(dl);
298 return (SET_ERROR(EEXIST));
304 error = zfs_match_find(zfsvfs, dzp, name, exact,
305 update, direntflags, realpnp, &zoid);
309 if (error != ENOENT || (flag & ZEXISTS)) {
310 zfs_dirent_unlock(dl);
315 zfs_dirent_unlock(dl);
316 return (SET_ERROR(EEXIST));
318 error = zfs_zget(zfsvfs, zoid, zpp);
320 zfs_dirent_unlock(dl);
323 if (!(flag & ZXATTR) && update)
324 dnlc_update(ZTOV(dzp), name, ZTOV(*zpp));
333 * Unlock this directory entry and wake anyone who was waiting for it.
336 zfs_dirent_unlock(zfs_dirlock_t *dl)
338 znode_t *dzp = dl->dl_dzp;
339 zfs_dirlock_t **prev_dl, *cur_dl;
341 mutex_enter(&dzp->z_lock);
343 if (!dl->dl_namelock)
344 rw_exit(&dzp->z_name_lock);
346 if (dl->dl_sharecnt > 1) {
348 mutex_exit(&dzp->z_lock);
351 prev_dl = &dzp->z_dirlocks;
352 while ((cur_dl = *prev_dl) != dl)
353 prev_dl = &cur_dl->dl_next;
354 *prev_dl = dl->dl_next;
355 cv_broadcast(&dl->dl_cv);
356 mutex_exit(&dzp->z_lock);
358 cv_destroy(&dl->dl_cv);
359 kmem_free(dl, sizeof (*dl) + dl->dl_namesize);
363 * Look up an entry in a directory.
365 * NOTE: '.' and '..' are handled as special cases because
366 * no directory entries are actually stored for them. If this is
367 * the root of a filesystem, then '.zfs' is also treated as a
368 * special pseudo-directory.
371 zfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp, int flags,
372 int *deflg, pathname_t *rpnp)
380 if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
381 mutex_enter(&dzp->z_lock);
382 unlinked = dzp->z_unlinked;
383 mutex_exit(&dzp->z_lock);
389 } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
390 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
393 * If we are a snapshot mounted under .zfs, return
394 * the vp for the snapshot directory.
396 if ((error = sa_lookup(dzp->z_sa_hdl,
397 SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
399 if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) {
400 error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
401 "snapshot", vpp, NULL, 0, NULL, kcred,
406 mutex_enter(&dzp->z_lock);
407 unlinked = dzp->z_unlinked;
408 mutex_exit(&dzp->z_lock);
412 rw_enter(&dzp->z_parent_lock, RW_READER);
413 error = zfs_zget(zfsvfs, parent, &zp);
416 rw_exit(&dzp->z_parent_lock);
417 } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
418 *vpp = zfsctl_root(dzp);
422 zf = ZEXISTS | ZSHARED;
423 if (flags & FIGNORECASE)
426 error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
429 zfs_dirent_unlock(dl);
430 dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
435 if ((flags & FIGNORECASE) && rpnp && !error)
436 (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
442 * unlinked Set (formerly known as the "delete queue") Error Handling
444 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
445 * don't specify the name of the entry that we will be manipulating. We
446 * also fib and say that we won't be adding any new entries to the
447 * unlinked set, even though we might (this is to lower the minimum file
448 * size that can be deleted in a full filesystem). So on the small
449 * chance that the nlink list is using a fat zap (ie. has more than
450 * 2000 entries), we *may* not pre-read a block that's needed.
451 * Therefore it is remotely possible for some of the assertions
452 * regarding the unlinked set below to fail due to i/o error. On a
453 * nondebug system, this will result in the space being leaked.
456 zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx)
458 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
460 ASSERT(zp->z_unlinked);
461 ASSERT(zp->z_links == 0);
464 zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
468 * Clean up any znodes that had no links when we either crashed or
469 * (force) umounted the file system.
472 zfs_unlinked_drain(zfsvfs_t *zfsvfs)
476 dmu_object_info_t doi;
481 * Interate over the contents of the unlinked set.
483 for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj);
484 zap_cursor_retrieve(&zc, &zap) == 0;
485 zap_cursor_advance(&zc)) {
488 * See what kind of object we have in list
491 error = dmu_object_info(zfsvfs->z_os,
492 zap.za_first_integer, &doi);
496 ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) ||
497 (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS));
499 * We need to re-mark these list entries for deletion,
500 * so we pull them back into core and set zp->z_unlinked.
502 error = zfs_zget(zfsvfs, zap.za_first_integer, &zp);
505 * We may pick up znodes that are already marked for deletion.
506 * This could happen during the purge of an extended attribute
507 * directory. All we need to do is skip over them, since they
508 * are already in the system marked z_unlinked.
513 zp->z_unlinked = B_TRUE;
516 zap_cursor_fini(&zc);
520 * Delete the entire contents of a directory. Return a count
521 * of the number of entries that could not be deleted. If we encounter
522 * an error, return a count of at least one so that the directory stays
523 * in the unlinked set.
525 * NOTE: this function assumes that the directory is inactive,
526 * so there is no need to lock its entries before deletion.
527 * Also, it assumes the directory contents is *only* regular
531 zfs_purgedir(znode_t *dzp)
537 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
542 for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id);
543 (error = zap_cursor_retrieve(&zc, &zap)) == 0;
544 zap_cursor_advance(&zc)) {
545 error = zfs_zget(zfsvfs,
546 ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp);
552 ASSERT((ZTOV(xzp)->v_type == VREG) ||
553 (ZTOV(xzp)->v_type == VLNK));
555 tx = dmu_tx_create(zfsvfs->z_os);
556 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
557 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name);
558 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
559 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
560 /* Is this really needed ? */
561 zfs_sa_upgrade_txholds(tx, xzp);
562 error = dmu_tx_assign(tx, TXG_WAIT);
569 bzero(&dl, sizeof (dl));
571 dl.dl_name = zap.za_name;
573 error = zfs_link_destroy(&dl, xzp, tx, 0, NULL);
580 zap_cursor_fini(&zc);
587 zfs_rmnode(znode_t *zp)
589 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
590 objset_t *os = zfsvfs->z_os;
597 ASSERT(zp->z_links == 0);
600 * If this is an attribute directory, purge its contents.
602 if (ZTOV(zp) != NULL && ZTOV(zp)->v_type == VDIR &&
603 (zp->z_pflags & ZFS_XATTR)) {
604 if (zfs_purgedir(zp) != 0) {
606 * Not enough space to delete some xattrs.
607 * Leave it in the unlinked set.
609 zfs_znode_dmu_fini(zp);
616 * Free up all the data in the file.
618 error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
621 * Not enough space. Leave the file in the unlinked set.
623 zfs_znode_dmu_fini(zp);
629 * If the file has extended attributes, we're going to unlink
632 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
633 &xattr_obj, sizeof (xattr_obj));
634 if (error == 0 && xattr_obj) {
635 error = zfs_zget(zfsvfs, xattr_obj, &xzp);
639 acl_obj = zfs_external_acl(zp);
642 * Set up the final transaction.
644 tx = dmu_tx_create(os);
645 dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
646 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
648 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
649 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
652 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
654 zfs_sa_upgrade_txholds(tx, zp);
655 error = dmu_tx_assign(tx, TXG_WAIT);
658 * Not enough space to delete the file. Leave it in the
659 * unlinked set, leaking it until the fs is remounted (at
660 * which point we'll call zfs_unlinked_drain() to process it).
663 zfs_znode_dmu_fini(zp);
670 mutex_enter(&xzp->z_lock);
671 xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */
672 xzp->z_links = 0; /* no more links to it */
673 VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
674 &xzp->z_links, sizeof (xzp->z_links), tx));
675 mutex_exit(&xzp->z_lock);
676 zfs_unlinked_add(xzp, tx);
679 /* Remove this znode from the unlinked set */
681 zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
683 zfs_znode_delete(zp, tx);
692 zfs_dirent(znode_t *zp, uint64_t mode)
694 uint64_t de = zp->z_id;
696 if (zp->z_zfsvfs->z_version >= ZPL_VERSION_DIRENT_TYPE)
697 de |= IFTODT(mode) << 60;
702 * Link zp into dl. Can only fail if zp has been unlinked.
705 zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
707 znode_t *dzp = dl->dl_dzp;
708 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
709 vnode_t *vp = ZTOV(zp);
711 int zp_is_dir = (vp->v_type == VDIR);
712 sa_bulk_attr_t bulk[5];
713 uint64_t mtime[2], ctime[2];
717 mutex_enter(&zp->z_lock);
719 if (!(flag & ZRENAMING)) {
720 if (zp->z_unlinked) { /* no new links to unlinked zp */
721 ASSERT(!(flag & (ZNEW | ZEXISTS)));
722 mutex_exit(&zp->z_lock);
723 return (SET_ERROR(ENOENT));
726 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
727 &zp->z_links, sizeof (zp->z_links));
730 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
731 &dzp->z_id, sizeof (dzp->z_id));
732 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
733 &zp->z_pflags, sizeof (zp->z_pflags));
735 if (!(flag & ZNEW)) {
736 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
737 ctime, sizeof (ctime));
738 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
741 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
744 mutex_exit(&zp->z_lock);
746 mutex_enter(&dzp->z_lock);
748 dzp->z_links += zp_is_dir;
750 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
751 &dzp->z_size, sizeof (dzp->z_size));
752 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
753 &dzp->z_links, sizeof (dzp->z_links));
754 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
755 mtime, sizeof (mtime));
756 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
757 ctime, sizeof (ctime));
758 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
759 &dzp->z_pflags, sizeof (dzp->z_pflags));
760 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
761 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
763 mutex_exit(&dzp->z_lock);
765 value = zfs_dirent(zp, zp->z_mode);
766 error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, dl->dl_name,
770 dnlc_update(ZTOV(dzp), dl->dl_name, vp);
776 zfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx,
781 if (zp->z_zfsvfs->z_norm) {
782 if (((zp->z_zfsvfs->z_case == ZFS_CASE_INSENSITIVE) &&
783 (flag & ZCIEXACT)) ||
784 ((zp->z_zfsvfs->z_case == ZFS_CASE_MIXED) &&
786 error = zap_remove_norm(zp->z_zfsvfs->z_os,
787 dzp->z_id, dl->dl_name, MT_EXACT, tx);
789 error = zap_remove_norm(zp->z_zfsvfs->z_os,
790 dzp->z_id, dl->dl_name, MT_FIRST, tx);
792 error = zap_remove(zp->z_zfsvfs->z_os,
793 dzp->z_id, dl->dl_name, tx);
800 * Unlink zp from dl, and mark zp for deletion if this was the last link.
801 * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST).
802 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
803 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
804 * and it's the caller's job to do it.
807 zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
808 boolean_t *unlinkedp)
810 znode_t *dzp = dl->dl_dzp;
811 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
812 vnode_t *vp = ZTOV(zp);
813 int zp_is_dir = (vp->v_type == VDIR);
814 boolean_t unlinked = B_FALSE;
815 sa_bulk_attr_t bulk[5];
816 uint64_t mtime[2], ctime[2];
820 dnlc_remove(ZTOV(dzp), dl->dl_name);
822 if (!(flag & ZRENAMING)) {
823 if (vn_vfswlock(vp)) /* prevent new mounts on zp */
824 return (SET_ERROR(EBUSY));
826 if (vn_ismntpt(vp)) { /* don't remove mount point */
828 return (SET_ERROR(EBUSY));
831 mutex_enter(&zp->z_lock);
833 if (zp_is_dir && !zfs_dirempty(zp)) {
834 mutex_exit(&zp->z_lock);
837 return (SET_ERROR(EEXIST));
839 return (SET_ERROR(ENOTEMPTY));
844 * If we get here, we are going to try to remove the object.
845 * First try removing the name from the directory; if that
846 * fails, return the error.
848 error = zfs_dropname(dl, zp, dzp, tx, flag);
850 mutex_exit(&zp->z_lock);
855 if (zp->z_links <= zp_is_dir) {
856 zfs_panic_recover("zfs: link count on vnode %p is %u, "
857 "should be at least %u", zp->z_vnode,
860 zp->z_links = zp_is_dir + 1;
862 if (--zp->z_links == zp_is_dir) {
863 zp->z_unlinked = B_TRUE;
867 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
868 NULL, &ctime, sizeof (ctime));
869 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
870 NULL, &zp->z_pflags, sizeof (zp->z_pflags));
871 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime,
874 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
875 NULL, &zp->z_links, sizeof (zp->z_links));
876 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
879 mutex_exit(&zp->z_lock);
882 error = zfs_dropname(dl, zp, dzp, tx, flag);
887 mutex_enter(&dzp->z_lock);
888 dzp->z_size--; /* one dirent removed */
889 dzp->z_links -= zp_is_dir; /* ".." link from zp */
890 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
891 NULL, &dzp->z_links, sizeof (dzp->z_links));
892 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
893 NULL, &dzp->z_size, sizeof (dzp->z_size));
894 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
895 NULL, ctime, sizeof (ctime));
896 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
897 NULL, mtime, sizeof (mtime));
898 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
899 NULL, &dzp->z_pflags, sizeof (dzp->z_pflags));
900 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
901 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
903 mutex_exit(&dzp->z_lock);
905 if (unlinkedp != NULL)
906 *unlinkedp = unlinked;
908 zfs_unlinked_add(zp, tx);
914 * Indicate whether the directory is empty. Works with or without z_lock
915 * held, but can only be consider a hint in the latter case. Returns true
916 * if only "." and ".." remain and there's no work in progress.
919 zfs_dirempty(znode_t *dzp)
921 return (dzp->z_size == 2 && dzp->z_dirlocks == 0);
925 zfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr)
927 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
931 zfs_acl_ids_t acl_ids;
932 boolean_t fuid_dirtied;
938 * In FreeBSD, access checking for creating an EA is being done
939 * in zfs_setextattr(),
942 if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr))
946 if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
949 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) {
950 zfs_acl_ids_free(&acl_ids);
951 return (SET_ERROR(EDQUOT));
955 tx = dmu_tx_create(zfsvfs->z_os);
956 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
957 ZFS_SA_BASE_ATTR_SIZE);
958 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
959 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
960 fuid_dirtied = zfsvfs->z_fuid_dirty;
962 zfs_fuid_txhold(zfsvfs, tx);
963 error = dmu_tx_assign(tx, TXG_NOWAIT);
965 if (error == ERESTART) {
970 zfs_acl_ids_free(&acl_ids);
974 zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids);
977 zfs_fuid_sync(zfsvfs, tx);
980 error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
981 &parent, sizeof (parent));
982 ASSERT(error == 0 && parent == zp->z_id);
985 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id,
986 sizeof (xzp->z_id), tx));
988 (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
989 xzp, "", NULL, acl_ids.z_fuidp, vap);
991 zfs_acl_ids_free(&acl_ids);
1000 * Return a znode for the extended attribute directory for zp.
1001 * ** If the directory does not already exist, it is created **
1003 * IN: zp - znode to obtain attribute directory from
1004 * cr - credentials of caller
1005 * flags - flags from the VOP_LOOKUP call
1007 * OUT: xzpp - pointer to extended attribute znode
1009 * RETURN: 0 on success
1010 * error number on failure
1013 zfs_get_xattrdir(znode_t *zp, vnode_t **xvpp, cred_t *cr, int flags)
1015 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1021 error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL);
1027 zfs_dirent_unlock(dl);
1032 if (!(flags & CREATE_XATTR_DIR)) {
1033 zfs_dirent_unlock(dl);
1035 return (SET_ERROR(ENOENT));
1037 return (SET_ERROR(ENOATTR));
1041 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) {
1042 zfs_dirent_unlock(dl);
1043 return (SET_ERROR(EROFS));
1047 * The ability to 'create' files in an attribute
1048 * directory comes from the write_xattr permission on the base file.
1050 * The ability to 'search' an attribute directory requires
1051 * read_xattr permission on the base file.
1053 * Once in a directory the ability to read/write attributes
1054 * is controlled by the permissions on the attribute file.
1056 va.va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID;
1058 va.va_mode = S_IFDIR | S_ISVTX | 0777;
1059 zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid);
1061 error = zfs_make_xattrdir(zp, &va, xvpp, cr);
1062 zfs_dirent_unlock(dl);
1064 if (error == ERESTART) {
1065 /* NB: we already did dmu_tx_wait() if necessary */
1069 VOP_UNLOCK(*xvpp, 0);
1075 * Decide whether it is okay to remove within a sticky directory.
1077 * In sticky directories, write access is not sufficient;
1078 * you can remove entries from a directory only if:
1080 * you own the directory,
1081 * you own the entry,
1082 * the entry is a plain file and you have write access,
1083 * or you are privileged (checked in secpolicy...).
1085 * The function returns 0 if remove access is granted.
1088 zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
1093 zfsvfs_t *zfsvfs = zdp->z_zfsvfs;
1095 if (zdp->z_zfsvfs->z_replay)
1098 if ((zdp->z_mode & S_ISVTX) == 0)
1101 downer = zfs_fuid_map_id(zfsvfs, zdp->z_uid, cr, ZFS_OWNER);
1102 fowner = zfs_fuid_map_id(zfsvfs, zp->z_uid, cr, ZFS_OWNER);
1104 if ((uid = crgetuid(cr)) == downer || uid == fowner ||
1105 (ZTOV(zp)->v_type == VREG &&
1106 zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
1109 return (secpolicy_vnode_remove(ZTOV(zp), cr));