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, 2014 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/zfs_vnops.h>
50 #include <sys/fs/zfs.h>
51 #include "fs/fs_subr.h"
54 #include <sys/atomic.h>
55 #include <sys/zfs_ctldir.h>
56 #include <sys/zfs_fuid.h>
58 #include <sys/zfs_sa.h>
60 #include <sys/extdirent.h>
63 * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups
64 * of names after deciding which is the appropriate lookup interface.
67 zfs_match_find(zfs_sb_t *zsb, znode_t *dzp, char *name, boolean_t exact,
68 boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid)
70 boolean_t conflict = B_FALSE;
74 matchtype_t mt = MT_FIRST;
80 bufsz = rpnp->pn_bufsize;
85 * In the non-mixed case we only expect there would ever
86 * be one match, but we need to use the normalizing lookup.
88 error = zap_lookup_norm(zsb->z_os, dzp->z_id, name, 8, 1,
89 zoid, mt, buf, bufsz, &conflict);
91 error = zap_lookup(zsb->z_os, dzp->z_id, name, 8, 1, zoid);
95 * Allow multiple entries provided the first entry is
96 * the object id. Non-zpl consumers may safely make
97 * use of the additional space.
99 * XXX: This should be a feature flag for compatibility
101 if (error == EOVERFLOW)
104 if (zsb->z_norm && !error && deflags)
105 *deflags = conflict ? ED_CASE_CONFLICT : 0;
107 *zoid = ZFS_DIRENT_OBJ(*zoid);
110 if (error == ENOENT && update)
111 dnlc_update(ZTOI(dzp), name, DNLC_NO_VNODE);
112 #endif /* HAVE_DNLC */
118 * Lock a directory entry. A dirlock on <dzp, name> protects that name
119 * in dzp's directory zap object. As long as you hold a dirlock, you can
120 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
121 * can change the zap entry for (i.e. link or unlink) this name.
124 * dzp - znode for directory
125 * name - name of entry to lock
126 * flag - ZNEW: if the entry already exists, fail with EEXIST.
127 * ZEXISTS: if the entry does not exist, fail with ENOENT.
128 * ZSHARED: allow concurrent access with other ZSHARED callers.
129 * ZXATTR: we want dzp's xattr directory
130 * ZCILOOK: On a mixed sensitivity file system,
131 * this lookup should be case-insensitive.
132 * ZCIEXACT: On a purely case-insensitive file system,
133 * this lookup should be case-sensitive.
134 * ZRENAMING: we are locking for renaming, force narrow locks
135 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
136 * current thread already holds it.
139 * zpp - pointer to the znode for the entry (NULL if there isn't one)
140 * dlpp - pointer to the dirlock for this entry (NULL on error)
141 * direntflags - (case-insensitive lookup only)
142 * flags if multiple case-sensitive matches exist in directory
143 * realpnp - (case-insensitive lookup only)
144 * actual name matched within the directory
146 * Return value: 0 on success or errno on failure.
148 * NOTE: Always checks for, and rejects, '.' and '..'.
149 * NOTE: For case-insensitive file systems we take wide locks (see below),
150 * but return znode pointers to a single match.
153 zfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp,
154 int flag, int *direntflags, pathname_t *realpnp)
156 zfs_sb_t *zsb = ZTOZSB(dzp);
163 #endif /* HAVE_DNLC */
171 * Verify that we are not trying to lock '.', '..', or '.zfs'
173 if ((name[0] == '.' &&
174 (name[1] == '\0' || (name[1] == '.' && name[2] == '\0'))) ||
175 (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0))
176 return (SET_ERROR(EEXIST));
179 * Case sensitivity and normalization preferences are set when
180 * the file system is created. These are stored in the
181 * zsb->z_case and zsb->z_norm fields. These choices
182 * affect what vnodes can be cached in the DNLC, how we
183 * perform zap lookups, and the "width" of our dirlocks.
185 * A normal dirlock locks a single name. Note that with
186 * normalization a name can be composed multiple ways, but
187 * when normalized, these names all compare equal. A wide
188 * dirlock locks multiple names. We need these when the file
189 * system is supporting mixed-mode access. It is sometimes
190 * necessary to lock all case permutations of file name at
191 * once so that simultaneous case-insensitive/case-sensitive
192 * behaves as rationally as possible.
196 * Decide if exact matches should be requested when performing
197 * a zap lookup on file systems supporting case-insensitive
201 ((zsb->z_case == ZFS_CASE_INSENSITIVE) && (flag & ZCIEXACT)) ||
202 ((zsb->z_case == ZFS_CASE_MIXED) && !(flag & ZCILOOK));
205 * Only look in or update the DNLC if we are looking for the
206 * name on a file system that does not require normalization
207 * or case folding. We can also look there if we happen to be
208 * on a non-normalizing, mixed sensitivity file system IF we
209 * are looking for the exact name.
211 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
212 * case for performance improvement?
214 update = !zsb->z_norm ||
215 ((zsb->z_case == ZFS_CASE_MIXED) &&
216 !(zsb->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK));
219 * ZRENAMING indicates we are in a situation where we should
220 * take narrow locks regardless of the file system's
221 * preferences for normalizing and case folding. This will
222 * prevent us deadlocking trying to grab the same wide lock
223 * twice if the two names happen to be case-insensitive
226 if (flag & ZRENAMING)
229 cmpflags = zsb->z_norm;
232 * Wait until there are no locks on this name.
234 * Don't grab the the lock if it is already held. However, cannot
235 * have both ZSHARED and ZHAVELOCK together.
237 ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK));
238 if (!(flag & ZHAVELOCK))
239 rw_enter(&dzp->z_name_lock, RW_READER);
241 mutex_enter(&dzp->z_lock);
243 if (dzp->z_unlinked) {
244 mutex_exit(&dzp->z_lock);
245 if (!(flag & ZHAVELOCK))
246 rw_exit(&dzp->z_name_lock);
247 return (SET_ERROR(ENOENT));
249 for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) {
250 if ((u8_strcmp(name, dl->dl_name, 0, cmpflags,
251 U8_UNICODE_LATEST, &error) == 0) || error != 0)
255 mutex_exit(&dzp->z_lock);
256 if (!(flag & ZHAVELOCK))
257 rw_exit(&dzp->z_name_lock);
258 return (SET_ERROR(ENOENT));
262 * Allocate a new dirlock and add it to the list.
264 dl = kmem_alloc(sizeof (zfs_dirlock_t), KM_SLEEP);
265 cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL);
271 dl->dl_next = dzp->z_dirlocks;
272 dzp->z_dirlocks = dl;
275 if ((flag & ZSHARED) && dl->dl_sharecnt != 0)
277 cv_wait(&dl->dl_cv, &dzp->z_lock);
281 * If the z_name_lock was NOT held for this dirlock record it.
283 if (flag & ZHAVELOCK)
286 if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) {
288 * We're the second shared reference to dl. Make a copy of
289 * dl_name in case the first thread goes away before we do.
290 * Note that we initialize the new name before storing its
291 * pointer into dl_name, because the first thread may load
292 * dl->dl_name at any time. He'll either see the old value,
293 * which is his, or the new shared copy; either is OK.
295 dl->dl_namesize = strlen(dl->dl_name) + 1;
296 name = kmem_alloc(dl->dl_namesize, KM_SLEEP);
297 bcopy(dl->dl_name, name, dl->dl_namesize);
301 mutex_exit(&dzp->z_lock);
304 * We have a dirlock on the name. (Note that it is the dirlock,
305 * not the dzp's z_lock, that protects the name in the zap object.)
306 * See if there's an object by this name; if so, put a hold on it.
309 error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zsb), &zoid,
312 error = (zoid == 0 ? SET_ERROR(ENOENT) : 0);
316 vp = dnlc_lookup(ZTOI(dzp), name);
317 if (vp == DNLC_NO_VNODE) {
319 error = SET_ERROR(ENOENT);
322 zfs_dirent_unlock(dl);
324 return (SET_ERROR(EEXIST));
330 error = zfs_match_find(zsb, dzp, name, exact,
331 update, direntflags, realpnp, &zoid);
334 error = zfs_match_find(zsb, dzp, name, exact,
335 update, direntflags, realpnp, &zoid);
336 #endif /* HAVE_DNLC */
339 if (error != ENOENT || (flag & ZEXISTS)) {
340 zfs_dirent_unlock(dl);
345 zfs_dirent_unlock(dl);
346 return (SET_ERROR(EEXIST));
348 error = zfs_zget(zsb, zoid, zpp);
350 zfs_dirent_unlock(dl);
354 if (!(flag & ZXATTR) && update)
355 dnlc_update(ZTOI(dzp), name, ZTOI(*zpp));
356 #endif /* HAVE_DNLC */
365 * Unlock this directory entry and wake anyone who was waiting for it.
368 zfs_dirent_unlock(zfs_dirlock_t *dl)
370 znode_t *dzp = dl->dl_dzp;
371 zfs_dirlock_t **prev_dl, *cur_dl;
373 mutex_enter(&dzp->z_lock);
375 if (!dl->dl_namelock)
376 rw_exit(&dzp->z_name_lock);
378 if (dl->dl_sharecnt > 1) {
380 mutex_exit(&dzp->z_lock);
383 prev_dl = &dzp->z_dirlocks;
384 while ((cur_dl = *prev_dl) != dl)
385 prev_dl = &cur_dl->dl_next;
386 *prev_dl = dl->dl_next;
387 cv_broadcast(&dl->dl_cv);
388 mutex_exit(&dzp->z_lock);
390 if (dl->dl_namesize != 0)
391 kmem_free(dl->dl_name, dl->dl_namesize);
392 cv_destroy(&dl->dl_cv);
393 kmem_free(dl, sizeof (*dl));
397 * Look up an entry in a directory.
399 * NOTE: '.' and '..' are handled as special cases because
400 * no directory entries are actually stored for them. If this is
401 * the root of a filesystem, then '.zfs' is also treated as a
402 * special pseudo-directory.
405 zfs_dirlook(znode_t *dzp, char *name, struct inode **ipp, int flags,
406 int *deflg, pathname_t *rpnp)
413 if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
416 } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
417 zfs_sb_t *zsb = ZTOZSB(dzp);
420 * If we are a snapshot mounted under .zfs, return
421 * the inode pointer for the snapshot directory.
423 if ((error = sa_lookup(dzp->z_sa_hdl,
424 SA_ZPL_PARENT(zsb), &parent, sizeof (parent))) != 0)
427 if (parent == dzp->z_id && zsb->z_parent != zsb) {
428 error = zfsctl_root_lookup(zsb->z_parent->z_ctldir,
429 "snapshot", ipp, 0, kcred, NULL, NULL);
432 rw_enter(&dzp->z_parent_lock, RW_READER);
433 error = zfs_zget(zsb, parent, &zp);
436 rw_exit(&dzp->z_parent_lock);
437 } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
438 *ipp = zfsctl_root(dzp);
442 zf = ZEXISTS | ZSHARED;
443 if (flags & FIGNORECASE)
446 error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
449 zfs_dirent_unlock(dl);
450 dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
455 if ((flags & FIGNORECASE) && rpnp && !error)
456 (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
462 * unlinked Set (formerly known as the "delete queue") Error Handling
464 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
465 * don't specify the name of the entry that we will be manipulating. We
466 * also fib and say that we won't be adding any new entries to the
467 * unlinked set, even though we might (this is to lower the minimum file
468 * size that can be deleted in a full filesystem). So on the small
469 * chance that the nlink list is using a fat zap (ie. has more than
470 * 2000 entries), we *may* not pre-read a block that's needed.
471 * Therefore it is remotely possible for some of the assertions
472 * regarding the unlinked set below to fail due to i/o error. On a
473 * nondebug system, this will result in the space being leaked.
476 zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx)
478 zfs_sb_t *zsb = ZTOZSB(zp);
480 ASSERT(zp->z_unlinked);
481 ASSERT(zp->z_links == 0);
484 zap_add_int(zsb->z_os, zsb->z_unlinkedobj, zp->z_id, tx));
488 * Clean up any znodes that had no links when we either crashed or
489 * (force) umounted the file system.
492 zfs_unlinked_drain(zfs_sb_t *zsb)
496 dmu_object_info_t doi;
501 * Iterate over the contents of the unlinked set.
503 for (zap_cursor_init(&zc, zsb->z_os, zsb->z_unlinkedobj);
504 zap_cursor_retrieve(&zc, &zap) == 0;
505 zap_cursor_advance(&zc)) {
508 * See what kind of object we have in list
511 error = dmu_object_info(zsb->z_os, zap.za_first_integer, &doi);
515 ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) ||
516 (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS));
518 * We need to re-mark these list entries for deletion,
519 * so we pull them back into core and set zp->z_unlinked.
521 error = zfs_zget(zsb, zap.za_first_integer, &zp);
524 * We may pick up znodes that are already marked for deletion.
525 * This could happen during the purge of an extended attribute
526 * directory. All we need to do is skip over them, since they
527 * are already in the system marked z_unlinked.
532 zp->z_unlinked = B_TRUE;
535 zap_cursor_fini(&zc);
539 * Delete the entire contents of a directory. Return a count
540 * of the number of entries that could not be deleted. If we encounter
541 * an error, return a count of at least one so that the directory stays
542 * in the unlinked set.
544 * NOTE: this function assumes that the directory is inactive,
545 * so there is no need to lock its entries before deletion.
546 * Also, it assumes the directory contents is *only* regular
550 zfs_purgedir(znode_t *dzp)
556 zfs_sb_t *zsb = ZTOZSB(dzp);
561 for (zap_cursor_init(&zc, zsb->z_os, dzp->z_id);
562 (error = zap_cursor_retrieve(&zc, &zap)) == 0;
563 zap_cursor_advance(&zc)) {
564 error = zfs_zget(zsb,
565 ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp);
571 ASSERT(S_ISREG(ZTOI(xzp)->i_mode) ||
572 S_ISLNK(ZTOI(xzp)->i_mode));
574 tx = dmu_tx_create(zsb->z_os);
575 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
576 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name);
577 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
578 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
579 /* Is this really needed ? */
580 zfs_sa_upgrade_txholds(tx, xzp);
581 dmu_tx_mark_netfree(tx);
582 error = dmu_tx_assign(tx, TXG_WAIT);
585 zfs_iput_async(ZTOI(xzp));
589 bzero(&dl, sizeof (dl));
591 dl.dl_name = zap.za_name;
593 error = zfs_link_destroy(&dl, xzp, tx, 0, NULL);
598 zfs_iput_async(ZTOI(xzp));
600 zap_cursor_fini(&zc);
607 zfs_rmnode(znode_t *zp)
609 zfs_sb_t *zsb = ZTOZSB(zp);
610 objset_t *os = zsb->z_os;
617 ASSERT(zp->z_links == 0);
618 ASSERT(atomic_read(&ZTOI(zp)->i_count) == 0);
621 * If this is an attribute directory, purge its contents.
623 if (S_ISDIR(ZTOI(zp)->i_mode) && (zp->z_pflags & ZFS_XATTR)) {
624 if (zfs_purgedir(zp) != 0) {
626 * Not enough space to delete some xattrs.
627 * Leave it in the unlinked set.
629 zfs_znode_dmu_fini(zp);
636 * Free up all the data in the file. We don't do this for directories
637 * because we need truncate and remove to be in the same tx, like in
638 * zfs_znode_delete(). Otherwise, if we crash here we'll end up with
639 * an inconsistent truncated zap object in the delete queue. Note a
640 * truncated file is harmless since it only contains user data.
642 if (S_ISREG(ZTOI(zp)->i_mode)) {
643 error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
646 * Not enough space. Leave the file in the unlinked
649 zfs_znode_dmu_fini(zp);
655 * If the file has extended attributes, we're going to unlink
658 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zsb),
659 &xattr_obj, sizeof (xattr_obj));
660 if (error == 0 && xattr_obj) {
661 error = zfs_zget(zsb, xattr_obj, &xzp);
665 acl_obj = zfs_external_acl(zp);
668 * Set up the final transaction.
670 tx = dmu_tx_create(os);
671 dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
672 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, FALSE, NULL);
674 dmu_tx_hold_zap(tx, zsb->z_unlinkedobj, TRUE, NULL);
675 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
678 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
680 zfs_sa_upgrade_txholds(tx, zp);
681 error = dmu_tx_assign(tx, TXG_WAIT);
684 * Not enough space to delete the file. Leave it in the
685 * unlinked set, leaking it until the fs is remounted (at
686 * which point we'll call zfs_unlinked_drain() to process it).
689 zfs_znode_dmu_fini(zp);
695 mutex_enter(&xzp->z_lock);
696 xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */
697 xzp->z_links = 0; /* no more links to it */
698 VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zsb),
699 &xzp->z_links, sizeof (xzp->z_links), tx));
700 mutex_exit(&xzp->z_lock);
701 zfs_unlinked_add(xzp, tx);
704 /* Remove this znode from the unlinked set */
706 zap_remove_int(zsb->z_os, zsb->z_unlinkedobj, zp->z_id, tx));
708 zfs_znode_delete(zp, tx);
713 zfs_iput_async(ZTOI(xzp));
717 zfs_dirent(znode_t *zp, uint64_t mode)
719 uint64_t de = zp->z_id;
721 if (ZTOZSB(zp)->z_version >= ZPL_VERSION_DIRENT_TYPE)
722 de |= IFTODT(mode) << 60;
727 * Link zp into dl. Can only fail if zp has been unlinked.
730 zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
732 znode_t *dzp = dl->dl_dzp;
733 zfs_sb_t *zsb = ZTOZSB(zp);
735 int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode);
736 sa_bulk_attr_t bulk[5];
737 uint64_t mtime[2], ctime[2];
741 mutex_enter(&zp->z_lock);
743 if (!(flag & ZRENAMING)) {
744 if (zp->z_unlinked) { /* no new links to unlinked zp */
745 ASSERT(!(flag & (ZNEW | ZEXISTS)));
746 mutex_exit(&zp->z_lock);
747 return (SET_ERROR(ENOENT));
750 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zsb), NULL,
751 &zp->z_links, sizeof (zp->z_links));
754 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zsb), NULL,
755 &dzp->z_id, sizeof (dzp->z_id));
756 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
757 &zp->z_pflags, sizeof (zp->z_pflags));
759 if (!(flag & ZNEW)) {
760 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
761 ctime, sizeof (ctime));
762 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
765 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
768 mutex_exit(&zp->z_lock);
770 mutex_enter(&dzp->z_lock);
772 dzp->z_links += zp_is_dir;
774 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zsb), NULL,
775 &dzp->z_size, sizeof (dzp->z_size));
776 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zsb), NULL,
777 &dzp->z_links, sizeof (dzp->z_links));
778 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL,
779 mtime, sizeof (mtime));
780 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
781 ctime, sizeof (ctime));
782 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
783 &dzp->z_pflags, sizeof (dzp->z_pflags));
784 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
785 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
787 mutex_exit(&dzp->z_lock);
789 value = zfs_dirent(zp, zp->z_mode);
790 error = zap_add(ZTOZSB(zp)->z_os, dzp->z_id, dl->dl_name,
798 zfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx,
803 if (ZTOZSB(zp)->z_norm) {
804 if (((ZTOZSB(zp)->z_case == ZFS_CASE_INSENSITIVE) &&
805 (flag & ZCIEXACT)) ||
806 ((ZTOZSB(zp)->z_case == ZFS_CASE_MIXED) &&
808 error = zap_remove_norm(ZTOZSB(zp)->z_os,
809 dzp->z_id, dl->dl_name, MT_EXACT, tx);
811 error = zap_remove_norm(ZTOZSB(zp)->z_os,
812 dzp->z_id, dl->dl_name, MT_FIRST, tx);
814 error = zap_remove(ZTOZSB(zp)->z_os,
815 dzp->z_id, dl->dl_name, tx);
822 * Unlink zp from dl, and mark zp for deletion if this was the last link. Can
823 * fail if zp is a mount point (EBUSY) or a non-empty directory (ENOTEMPTY).
824 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
825 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
826 * and it's the caller's job to do it.
829 zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
830 boolean_t *unlinkedp)
832 znode_t *dzp = dl->dl_dzp;
833 zfs_sb_t *zsb = ZTOZSB(dzp);
834 int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode);
835 boolean_t unlinked = B_FALSE;
836 sa_bulk_attr_t bulk[5];
837 uint64_t mtime[2], ctime[2];
842 dnlc_remove(ZTOI(dzp), dl->dl_name);
843 #endif /* HAVE_DNLC */
845 if (!(flag & ZRENAMING)) {
846 mutex_enter(&zp->z_lock);
848 if (zp_is_dir && !zfs_dirempty(zp)) {
849 mutex_exit(&zp->z_lock);
850 return (SET_ERROR(ENOTEMPTY));
854 * If we get here, we are going to try to remove the object.
855 * First try removing the name from the directory; if that
856 * fails, return the error.
858 error = zfs_dropname(dl, zp, dzp, tx, flag);
860 mutex_exit(&zp->z_lock);
864 if (zp->z_links <= zp_is_dir) {
865 zfs_panic_recover("zfs: link count on %lu is %u, "
866 "should be at least %u", zp->z_id,
867 (int)zp->z_links, zp_is_dir + 1);
868 zp->z_links = zp_is_dir + 1;
870 if (--zp->z_links == zp_is_dir) {
871 zp->z_unlinked = B_TRUE;
875 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb),
876 NULL, &ctime, sizeof (ctime));
877 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb),
878 NULL, &zp->z_pflags, sizeof (zp->z_pflags));
879 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime,
882 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zsb),
883 NULL, &zp->z_links, sizeof (zp->z_links));
884 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
887 mutex_exit(&zp->z_lock);
889 error = zfs_dropname(dl, zp, dzp, tx, flag);
894 mutex_enter(&dzp->z_lock);
895 dzp->z_size--; /* one dirent removed */
896 dzp->z_links -= zp_is_dir; /* ".." link from zp */
897 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zsb),
898 NULL, &dzp->z_links, sizeof (dzp->z_links));
899 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zsb),
900 NULL, &dzp->z_size, sizeof (dzp->z_size));
901 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb),
902 NULL, ctime, sizeof (ctime));
903 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb),
904 NULL, mtime, sizeof (mtime));
905 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb),
906 NULL, &dzp->z_pflags, sizeof (dzp->z_pflags));
907 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
908 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
910 mutex_exit(&dzp->z_lock);
912 if (unlinkedp != NULL)
913 *unlinkedp = unlinked;
915 zfs_unlinked_add(zp, tx);
921 * Indicate whether the directory is empty. Works with or without z_lock
922 * held, but can only be consider a hint in the latter case. Returns true
923 * if only "." and ".." remain and there's no work in progress.
926 zfs_dirempty(znode_t *dzp)
928 return (dzp->z_size == 2 && dzp->z_dirlocks == 0);
932 zfs_make_xattrdir(znode_t *zp, vattr_t *vap, struct inode **xipp, cred_t *cr)
934 zfs_sb_t *zsb = ZTOZSB(zp);
938 zfs_acl_ids_t acl_ids;
939 boolean_t fuid_dirtied;
946 if ((error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr)))
949 if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
952 if (zfs_acl_ids_overquota(zsb, &acl_ids)) {
953 zfs_acl_ids_free(&acl_ids);
954 return (SET_ERROR(EDQUOT));
957 tx = dmu_tx_create(zsb->z_os);
958 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
959 ZFS_SA_BASE_ATTR_SIZE);
960 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
961 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
962 fuid_dirtied = zsb->z_fuid_dirty;
964 zfs_fuid_txhold(zsb, tx);
965 error = dmu_tx_assign(tx, TXG_WAIT);
967 zfs_acl_ids_free(&acl_ids);
971 zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids);
974 zfs_fuid_sync(zsb, tx);
977 error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zsb),
978 &parent, sizeof (parent));
979 ASSERT(error == 0 && parent == zp->z_id);
982 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zsb), &xzp->z_id,
983 sizeof (xzp->z_id), tx));
985 (void) zfs_log_create(zsb->z_log, tx, TX_MKXATTR, zp,
986 xzp, "", NULL, acl_ids.z_fuidp, vap);
988 zfs_acl_ids_free(&acl_ids);
997 * Return a znode for the extended attribute directory for zp.
998 * ** If the directory does not already exist, it is created **
1000 * IN: zp - znode to obtain attribute directory from
1001 * cr - credentials of caller
1002 * flags - flags from the VOP_LOOKUP call
1004 * OUT: xipp - pointer to extended attribute znode
1006 * RETURN: 0 on success
1007 * error number on failure
1010 zfs_get_xattrdir(znode_t *zp, struct inode **xipp, cred_t *cr, int flags)
1012 zfs_sb_t *zsb = ZTOZSB(zp);
1018 error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL);
1024 zfs_dirent_unlock(dl);
1028 if (!(flags & CREATE_XATTR_DIR)) {
1029 zfs_dirent_unlock(dl);
1030 return (SET_ERROR(ENOENT));
1033 if (zfs_is_readonly(zsb)) {
1034 zfs_dirent_unlock(dl);
1035 return (SET_ERROR(EROFS));
1039 * The ability to 'create' files in an attribute
1040 * directory comes from the write_xattr permission on the base file.
1042 * The ability to 'search' an attribute directory requires
1043 * read_xattr permission on the base file.
1045 * Once in a directory the ability to read/write attributes
1046 * is controlled by the permissions on the attribute file.
1048 va.va_mask = ATTR_MODE | ATTR_UID | ATTR_GID;
1049 va.va_mode = S_IFDIR | S_ISVTX | 0777;
1050 zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid);
1052 va.va_dentry = NULL;
1053 error = zfs_make_xattrdir(zp, &va, xipp, cr);
1054 zfs_dirent_unlock(dl);
1056 if (error == ERESTART) {
1057 /* NB: we already did dmu_tx_wait() if necessary */
1065 * Decide whether it is okay to remove within a sticky directory.
1067 * In sticky directories, write access is not sufficient;
1068 * you can remove entries from a directory only if:
1070 * you own the directory,
1071 * you own the entry,
1072 * the entry is a plain file and you have write access,
1073 * or you are privileged (checked in secpolicy...).
1075 * The function returns 0 if remove access is granted.
1078 zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
1083 zfs_sb_t *zsb = ZTOZSB(zdp);
1088 if ((zdp->z_mode & S_ISVTX) == 0)
1091 downer = zfs_fuid_map_id(zsb, zdp->z_uid, cr, ZFS_OWNER);
1092 fowner = zfs_fuid_map_id(zsb, zp->z_uid, cr, ZFS_OWNER);
1094 if ((uid = crgetuid(cr)) == downer || uid == fowner ||
1095 (S_ISDIR(ZTOI(zp)->i_mode) &&
1096 zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0))
1099 return (secpolicy_vnode_remove(cr));