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]
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2013, 2016 by Delphix. All rights reserved.
25 * Copyright 2017 Nexenta Systems, Inc.
28 #include <sys/types.h>
29 #include <sys/param.h>
31 #include <sys/sysmacros.h>
33 #include <sys/vnode.h>
38 #include <sys/pathname.h>
39 #include <sys/cmn_err.h>
40 #include <sys/errno.h>
42 #include <sys/sunddi.h>
43 #include <sys/random.h>
44 #include <sys/policy.h>
45 #include <sys/zfs_dir.h>
46 #include <sys/zfs_acl.h>
47 #include <sys/zfs_vnops.h>
48 #include <sys/fs/zfs.h>
51 #include <sys/atomic.h>
52 #include <sys/zfs_ctldir.h>
53 #include <sys/zfs_fuid.h>
55 #include <sys/zfs_sa.h>
58 * zfs_match_find() is used by zfs_dirent_lock() to peform zap lookups
59 * of names after deciding which is the appropriate lookup interface.
62 zfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, char *name, matchtype_t mt,
63 boolean_t update, int *deflags, pathname_t *rpnp, uint64_t *zoid)
65 boolean_t conflict = B_FALSE;
74 bufsz = rpnp->pn_bufsize;
78 * In the non-mixed case we only expect there would ever
79 * be one match, but we need to use the normalizing lookup.
81 error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1,
82 zoid, mt, buf, bufsz, &conflict);
84 error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid);
88 * Allow multiple entries provided the first entry is
89 * the object id. Non-zpl consumers may safely make
90 * use of the additional space.
92 * XXX: This should be a feature flag for compatibility
94 if (error == EOVERFLOW)
97 if (zfsvfs->z_norm && !error && deflags)
98 *deflags = conflict ? ED_CASE_CONFLICT : 0;
100 *zoid = ZFS_DIRENT_OBJ(*zoid);
106 * Lock a directory entry. A dirlock on <dzp, name> protects that name
107 * in dzp's directory zap object. As long as you hold a dirlock, you can
108 * assume two things: (1) dzp cannot be reaped, and (2) no other thread
109 * can change the zap entry for (i.e. link or unlink) this name.
112 * dzp - znode for directory
113 * name - name of entry to lock
114 * flag - ZNEW: if the entry already exists, fail with EEXIST.
115 * ZEXISTS: if the entry does not exist, fail with ENOENT.
116 * ZSHARED: allow concurrent access with other ZSHARED callers.
117 * ZXATTR: we want dzp's xattr directory
118 * ZCILOOK: On a mixed sensitivity file system,
119 * this lookup should be case-insensitive.
120 * ZCIEXACT: On a purely case-insensitive file system,
121 * this lookup should be case-sensitive.
122 * ZRENAMING: we are locking for renaming, force narrow locks
123 * ZHAVELOCK: Don't grab the z_name_lock for this call. The
124 * current thread already holds it.
127 * zpp - pointer to the znode for the entry (NULL if there isn't one)
128 * dlpp - pointer to the dirlock for this entry (NULL on error)
129 * direntflags - (case-insensitive lookup only)
130 * flags if multiple case-sensitive matches exist in directory
131 * realpnp - (case-insensitive lookup only)
132 * actual name matched within the directory
134 * Return value: 0 on success or errno on failure.
136 * NOTE: Always checks for, and rejects, '.' and '..'.
137 * NOTE: For case-insensitive file systems we take wide locks (see below),
138 * but return znode pointers to a single match.
141 zfs_dirent_lock(zfs_dirlock_t **dlpp, znode_t *dzp, char *name, znode_t **zpp,
142 int flag, int *direntflags, pathname_t *realpnp)
144 zfsvfs_t *zfsvfs = ZTOZSB(dzp);
156 * Verify that we are not trying to lock '.', '..', or '.zfs'
158 if ((name[0] == '.' &&
159 (name[1] == '\0' || (name[1] == '.' && name[2] == '\0'))) ||
160 (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0))
161 return (SET_ERROR(EEXIST));
164 * Case sensitivity and normalization preferences are set when
165 * the file system is created. These are stored in the
166 * zfsvfs->z_case and zfsvfs->z_norm fields. These choices
167 * affect what vnodes can be cached in the DNLC, how we
168 * perform zap lookups, and the "width" of our dirlocks.
170 * A normal dirlock locks a single name. Note that with
171 * normalization a name can be composed multiple ways, but
172 * when normalized, these names all compare equal. A wide
173 * dirlock locks multiple names. We need these when the file
174 * system is supporting mixed-mode access. It is sometimes
175 * necessary to lock all case permutations of file name at
176 * once so that simultaneous case-insensitive/case-sensitive
177 * behaves as rationally as possible.
181 * When matching we may need to normalize & change case according to
184 * Note that a normalized match is necessary for a case insensitive
185 * filesystem when the lookup request is not exact because normalization
186 * can fold case independent of normalizing code point sequences.
188 * See the table above zfs_dropname().
190 if (zfsvfs->z_norm != 0) {
194 * Determine if the match needs to honor the case specified in
195 * lookup, and if so keep track of that so that during
196 * normalization we don't fold case.
198 if ((zfsvfs->z_case == ZFS_CASE_INSENSITIVE &&
199 (flag & ZCIEXACT)) ||
200 (zfsvfs->z_case == ZFS_CASE_MIXED && !(flag & ZCILOOK))) {
206 * Only look in or update the DNLC if we are looking for the
207 * name on a file system that does not require normalization
208 * or case folding. We can also look there if we happen to be
209 * on a non-normalizing, mixed sensitivity file system IF we
210 * are looking for the exact name.
212 * Maybe can add TO-UPPERed version of name to dnlc in ci-only
213 * case for performance improvement?
215 update = !zfsvfs->z_norm ||
216 (zfsvfs->z_case == ZFS_CASE_MIXED &&
217 !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER) && !(flag & ZCILOOK));
220 * ZRENAMING indicates we are in a situation where we should
221 * take narrow locks regardless of the file system's
222 * preferences for normalizing and case folding. This will
223 * prevent us deadlocking trying to grab the same wide lock
224 * twice if the two names happen to be case-insensitive
227 if (flag & ZRENAMING)
230 cmpflags = zfsvfs->z_norm;
233 * Wait until there are no locks on this name.
235 * Don't grab the the lock if it is already held. However, cannot
236 * have both ZSHARED and ZHAVELOCK together.
238 ASSERT(!(flag & ZSHARED) || !(flag & ZHAVELOCK));
239 if (!(flag & ZHAVELOCK))
240 rw_enter(&dzp->z_name_lock, RW_READER);
242 mutex_enter(&dzp->z_lock);
244 if (dzp->z_unlinked && !(flag & ZXATTR)) {
245 mutex_exit(&dzp->z_lock);
246 if (!(flag & ZHAVELOCK))
247 rw_exit(&dzp->z_name_lock);
248 return (SET_ERROR(ENOENT));
250 for (dl = dzp->z_dirlocks; dl != NULL; dl = dl->dl_next) {
251 if ((u8_strcmp(name, dl->dl_name, 0, cmpflags,
252 U8_UNICODE_LATEST, &error) == 0) || error != 0)
256 mutex_exit(&dzp->z_lock);
257 if (!(flag & ZHAVELOCK))
258 rw_exit(&dzp->z_name_lock);
259 return (SET_ERROR(ENOENT));
263 * Allocate a new dirlock and add it to the list.
265 dl = kmem_alloc(sizeof (zfs_dirlock_t), KM_SLEEP);
266 cv_init(&dl->dl_cv, NULL, CV_DEFAULT, NULL);
272 dl->dl_next = dzp->z_dirlocks;
273 dzp->z_dirlocks = dl;
276 if ((flag & ZSHARED) && dl->dl_sharecnt != 0)
278 cv_wait(&dl->dl_cv, &dzp->z_lock);
282 * If the z_name_lock was NOT held for this dirlock record it.
284 if (flag & ZHAVELOCK)
287 if ((flag & ZSHARED) && ++dl->dl_sharecnt > 1 && dl->dl_namesize == 0) {
289 * We're the second shared reference to dl. Make a copy of
290 * dl_name in case the first thread goes away before we do.
291 * Note that we initialize the new name before storing its
292 * pointer into dl_name, because the first thread may load
293 * dl->dl_name at any time. It'll either see the old value,
294 * which belongs to it, or the new shared copy; either is OK.
296 dl->dl_namesize = strlen(dl->dl_name) + 1;
297 name = kmem_alloc(dl->dl_namesize, KM_SLEEP);
298 bcopy(dl->dl_name, name, dl->dl_namesize);
302 mutex_exit(&dzp->z_lock);
305 * We have a dirlock on the name. (Note that it is the dirlock,
306 * not the dzp's z_lock, that protects the name in the zap object.)
307 * See if there's an object by this name; if so, put a hold on it.
310 error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid,
313 error = (zoid == 0 ? SET_ERROR(ENOENT) : 0);
315 error = zfs_match_find(zfsvfs, dzp, name, mt,
316 update, direntflags, realpnp, &zoid);
319 if (error != ENOENT || (flag & ZEXISTS)) {
320 zfs_dirent_unlock(dl);
325 zfs_dirent_unlock(dl);
326 return (SET_ERROR(EEXIST));
328 error = zfs_zget(zfsvfs, zoid, zpp);
330 zfs_dirent_unlock(dl);
341 * Unlock this directory entry and wake anyone who was waiting for it.
344 zfs_dirent_unlock(zfs_dirlock_t *dl)
346 znode_t *dzp = dl->dl_dzp;
347 zfs_dirlock_t **prev_dl, *cur_dl;
349 mutex_enter(&dzp->z_lock);
351 if (!dl->dl_namelock)
352 rw_exit(&dzp->z_name_lock);
354 if (dl->dl_sharecnt > 1) {
356 mutex_exit(&dzp->z_lock);
359 prev_dl = &dzp->z_dirlocks;
360 while ((cur_dl = *prev_dl) != dl)
361 prev_dl = &cur_dl->dl_next;
362 *prev_dl = dl->dl_next;
363 cv_broadcast(&dl->dl_cv);
364 mutex_exit(&dzp->z_lock);
366 if (dl->dl_namesize != 0)
367 kmem_free(dl->dl_name, dl->dl_namesize);
368 cv_destroy(&dl->dl_cv);
369 kmem_free(dl, sizeof (*dl));
373 * Look up an entry in a directory.
375 * NOTE: '.' and '..' are handled as special cases because
376 * no directory entries are actually stored for them. If this is
377 * the root of a filesystem, then '.zfs' is also treated as a
378 * special pseudo-directory.
381 zfs_dirlook(znode_t *dzp, char *name, struct inode **ipp, int flags,
382 int *deflg, pathname_t *rpnp)
389 if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
392 } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
393 zfsvfs_t *zfsvfs = ZTOZSB(dzp);
396 * If we are a snapshot mounted under .zfs, return
397 * the inode pointer for the snapshot directory.
399 if ((error = sa_lookup(dzp->z_sa_hdl,
400 SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
403 if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) {
404 error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
405 "snapshot", ipp, 0, kcred, NULL, NULL);
408 rw_enter(&dzp->z_parent_lock, RW_READER);
409 error = zfs_zget(zfsvfs, parent, &zp);
412 rw_exit(&dzp->z_parent_lock);
413 } else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
414 *ipp = zfsctl_root(dzp);
418 zf = ZEXISTS | ZSHARED;
419 if (flags & FIGNORECASE)
422 error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
425 zfs_dirent_unlock(dl);
426 dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
431 if ((flags & FIGNORECASE) && rpnp && !error)
432 (void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
438 * unlinked Set (formerly known as the "delete queue") Error Handling
440 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we
441 * don't specify the name of the entry that we will be manipulating. We
442 * also fib and say that we won't be adding any new entries to the
443 * unlinked set, even though we might (this is to lower the minimum file
444 * size that can be deleted in a full filesystem). So on the small
445 * chance that the nlink list is using a fat zap (ie. has more than
446 * 2000 entries), we *may* not pre-read a block that's needed.
447 * Therefore it is remotely possible for some of the assertions
448 * regarding the unlinked set below to fail due to i/o error. On a
449 * nondebug system, this will result in the space being leaked.
452 zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx)
454 zfsvfs_t *zfsvfs = ZTOZSB(zp);
456 ASSERT(zp->z_unlinked);
457 ASSERT(ZTOI(zp)->i_nlink == 0);
460 zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
462 dataset_kstats_update_nunlinks_kstat(&zfsvfs->z_kstat, 1);
466 * Clean up any znodes that had no links when we either crashed or
467 * (force) umounted the file system.
470 zfs_unlinked_drain_task(void *arg)
472 zfsvfs_t *zfsvfs = arg;
475 dmu_object_info_t doi;
479 ASSERT3B(zfsvfs->z_draining, ==, B_TRUE);
482 * Iterate over the contents of the unlinked set.
484 for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj);
485 zap_cursor_retrieve(&zc, &zap) == 0 && !zfsvfs->z_drain_cancel;
486 zap_cursor_advance(&zc)) {
489 * See what kind of object we have in list
492 error = dmu_object_info(zfsvfs->z_os,
493 zap.za_first_integer, &doi);
497 ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) ||
498 (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS));
500 * We need to re-mark these list entries for deletion,
501 * so we pull them back into core and set zp->z_unlinked.
503 error = zfs_zget(zfsvfs, zap.za_first_integer, &zp);
506 * We may pick up znodes that are already marked for deletion.
507 * This could happen during the purge of an extended attribute
508 * directory. All we need to do is skip over them, since they
509 * are already in the system marked z_unlinked.
514 zp->z_unlinked = B_TRUE;
517 * iput() is Linux's equivalent to illumos' VN_RELE(). It will
518 * decrement the inode's ref count and may cause the inode to be
519 * synchronously freed. We interrupt freeing of this inode, by
520 * checking the return value of dmu_objset_zfs_unmounting() in
521 * dmu_free_long_range(), when an unmount is requested.
524 ASSERT3B(zfsvfs->z_unmounted, ==, B_FALSE);
526 zap_cursor_fini(&zc);
528 zfsvfs->z_draining = B_FALSE;
529 zfsvfs->z_drain_task = TASKQID_INVALID;
533 * Sets z_draining then tries to dispatch async unlinked drain.
534 * If that fails executes synchronous unlinked drain.
537 zfs_unlinked_drain(zfsvfs_t *zfsvfs)
539 ASSERT3B(zfsvfs->z_unmounted, ==, B_FALSE);
540 ASSERT3B(zfsvfs->z_draining, ==, B_FALSE);
542 zfsvfs->z_draining = B_TRUE;
543 zfsvfs->z_drain_cancel = B_FALSE;
545 zfsvfs->z_drain_task = taskq_dispatch(
546 dsl_pool_unlinked_drain_taskq(dmu_objset_pool(zfsvfs->z_os)),
547 zfs_unlinked_drain_task, zfsvfs, TQ_SLEEP);
548 if (zfsvfs->z_drain_task == TASKQID_INVALID) {
549 zfs_dbgmsg("async zfs_unlinked_drain dispatch failed");
550 zfs_unlinked_drain_task(zfsvfs);
555 * Wait for the unlinked drain taskq task to stop. This will interrupt the
556 * unlinked set processing if it is in progress.
559 zfs_unlinked_drain_stop_wait(zfsvfs_t *zfsvfs)
561 ASSERT3B(zfsvfs->z_unmounted, ==, B_FALSE);
563 if (zfsvfs->z_draining) {
564 zfsvfs->z_drain_cancel = B_TRUE;
565 taskq_cancel_id(dsl_pool_unlinked_drain_taskq(
566 dmu_objset_pool(zfsvfs->z_os)), zfsvfs->z_drain_task);
567 zfsvfs->z_drain_task = TASKQID_INVALID;
568 zfsvfs->z_draining = B_FALSE;
573 * Delete the entire contents of a directory. Return a count
574 * of the number of entries that could not be deleted. If we encounter
575 * an error, return a count of at least one so that the directory stays
576 * in the unlinked set.
578 * NOTE: this function assumes that the directory is inactive,
579 * so there is no need to lock its entries before deletion.
580 * Also, it assumes the directory contents is *only* regular
584 zfs_purgedir(znode_t *dzp)
590 zfsvfs_t *zfsvfs = ZTOZSB(dzp);
595 for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id);
596 (error = zap_cursor_retrieve(&zc, &zap)) == 0;
597 zap_cursor_advance(&zc)) {
598 error = zfs_zget(zfsvfs,
599 ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp);
605 ASSERT(S_ISREG(ZTOI(xzp)->i_mode) ||
606 S_ISLNK(ZTOI(xzp)->i_mode));
608 tx = dmu_tx_create(zfsvfs->z_os);
609 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE);
610 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name);
611 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
612 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
613 /* Is this really needed ? */
614 zfs_sa_upgrade_txholds(tx, xzp);
615 dmu_tx_mark_netfree(tx);
616 error = dmu_tx_assign(tx, TXG_WAIT);
619 zfs_iput_async(ZTOI(xzp));
623 bzero(&dl, sizeof (dl));
625 dl.dl_name = zap.za_name;
627 error = zfs_link_destroy(&dl, xzp, tx, 0, NULL);
632 zfs_iput_async(ZTOI(xzp));
634 zap_cursor_fini(&zc);
641 zfs_rmnode(znode_t *zp)
643 zfsvfs_t *zfsvfs = ZTOZSB(zp);
644 objset_t *os = zfsvfs->z_os;
652 ASSERT(ZTOI(zp)->i_nlink == 0);
653 ASSERT(atomic_read(&ZTOI(zp)->i_count) == 0);
656 * If this is an attribute directory, purge its contents.
658 if (S_ISDIR(ZTOI(zp)->i_mode) && (zp->z_pflags & ZFS_XATTR)) {
659 if (zfs_purgedir(zp) != 0) {
661 * Not enough space to delete some xattrs.
662 * Leave it in the unlinked set.
664 zfs_znode_dmu_fini(zp);
671 * Free up all the data in the file. We don't do this for directories
672 * because we need truncate and remove to be in the same tx, like in
673 * zfs_znode_delete(). Otherwise, if we crash here we'll end up with
674 * an inconsistent truncated zap object in the delete queue. Note a
675 * truncated file is harmless since it only contains user data.
677 if (S_ISREG(ZTOI(zp)->i_mode)) {
678 error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END);
681 * Not enough space or we were interrupted by unmount.
682 * Leave the file in the unlinked set.
684 zfs_znode_dmu_fini(zp);
690 * If the file has extended attributes, we're going to unlink
693 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs),
694 &xattr_obj, sizeof (xattr_obj));
695 if (error == 0 && xattr_obj) {
696 error = zfs_zget(zfsvfs, xattr_obj, &xzp);
700 acl_obj = zfs_external_acl(zp);
703 * Set up the final transaction.
705 tx = dmu_tx_create(os);
706 dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END);
707 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL);
709 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL);
710 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE);
713 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END);
715 zfs_sa_upgrade_txholds(tx, zp);
716 error = dmu_tx_assign(tx, TXG_WAIT);
719 * Not enough space to delete the file. Leave it in the
720 * unlinked set, leaking it until the fs is remounted (at
721 * which point we'll call zfs_unlinked_drain() to process it).
724 zfs_znode_dmu_fini(zp);
730 mutex_enter(&xzp->z_lock);
731 xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */
732 clear_nlink(ZTOI(xzp)); /* no more links to it */
734 VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs),
735 &links, sizeof (links), tx));
736 mutex_exit(&xzp->z_lock);
737 zfs_unlinked_add(xzp, tx);
740 /* Remove this znode from the unlinked set */
742 zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx));
744 dataset_kstats_update_nunlinked_kstat(&zfsvfs->z_kstat, 1);
746 zfs_znode_delete(zp, tx);
751 zfs_iput_async(ZTOI(xzp));
755 zfs_dirent(znode_t *zp, uint64_t mode)
757 uint64_t de = zp->z_id;
759 if (ZTOZSB(zp)->z_version >= ZPL_VERSION_DIRENT_TYPE)
760 de |= IFTODT(mode) << 60;
765 * Link zp into dl. Can fail in the following cases :
766 * - if zp has been unlinked.
767 * - if the number of entries with the same hash (aka. colliding entries)
768 * exceed the capacity of a leaf-block of fatzap and splitting of the
769 * leaf-block does not help.
772 zfs_link_create(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag)
774 znode_t *dzp = dl->dl_dzp;
775 zfsvfs_t *zfsvfs = ZTOZSB(zp);
777 int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode);
778 sa_bulk_attr_t bulk[5];
779 uint64_t mtime[2], ctime[2];
784 mutex_enter(&zp->z_lock);
786 if (!(flag & ZRENAMING)) {
787 if (zp->z_unlinked) { /* no new links to unlinked zp */
788 ASSERT(!(flag & (ZNEW | ZEXISTS)));
789 mutex_exit(&zp->z_lock);
790 return (SET_ERROR(ENOENT));
792 if (!(flag & ZNEW)) {
794 * ZNEW nodes come from zfs_mknode() where the link
795 * count has already been initialised
798 links = ZTOI(zp)->i_nlink;
799 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
800 NULL, &links, sizeof (links));
804 value = zfs_dirent(zp, zp->z_mode);
805 error = zap_add(ZTOZSB(zp)->z_os, dzp->z_id, dl->dl_name, 8, 1,
809 * zap_add could fail to add the entry if it exceeds the capacity of the
810 * leaf-block and zap_leaf_split() failed to help.
811 * The caller of this routine is responsible for failing the transaction
812 * which will rollback the SA updates done above.
815 if (!(flag & ZRENAMING) && !(flag & ZNEW))
816 drop_nlink(ZTOI(zp));
817 mutex_exit(&zp->z_lock);
821 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL,
822 &dzp->z_id, sizeof (dzp->z_id));
823 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
824 &zp->z_pflags, sizeof (zp->z_pflags));
826 if (!(flag & ZNEW)) {
827 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
828 ctime, sizeof (ctime));
829 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
832 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
835 mutex_exit(&zp->z_lock);
837 mutex_enter(&dzp->z_lock);
840 inc_nlink(ZTOI(dzp));
841 links = ZTOI(dzp)->i_nlink;
843 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
844 &dzp->z_size, sizeof (dzp->z_size));
845 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
846 &links, sizeof (links));
847 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
848 mtime, sizeof (mtime));
849 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
850 ctime, sizeof (ctime));
851 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
852 &dzp->z_pflags, sizeof (dzp->z_pflags));
853 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime);
854 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
856 mutex_exit(&dzp->z_lock);
862 * The match type in the code for this function should conform to:
864 * ------------------------------------------------------------------------
865 * fs type | z_norm | lookup type | match type
866 * ---------|-------------|-------------|----------------------------------
867 * CS !norm | 0 | 0 | 0 (exact)
868 * CS norm | formX | 0 | MT_NORMALIZE
869 * CI !norm | upper | !ZCIEXACT | MT_NORMALIZE
870 * CI !norm | upper | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE
871 * CI norm | upper|formX | !ZCIEXACT | MT_NORMALIZE
872 * CI norm | upper|formX | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE
873 * CM !norm | upper | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE
874 * CM !norm | upper | ZCILOOK | MT_NORMALIZE
875 * CM norm | upper|formX | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE
876 * CM norm | upper|formX | ZCILOOK | MT_NORMALIZE
879 * CS = Case Sensitive, CI = Case Insensitive, CM = Case Mixed
880 * upper = case folding set by fs type on creation (U8_TEXTPREP_TOUPPER)
881 * formX = unicode normalization form set on fs creation
884 zfs_dropname(zfs_dirlock_t *dl, znode_t *zp, znode_t *dzp, dmu_tx_t *tx,
889 if (ZTOZSB(zp)->z_norm) {
890 matchtype_t mt = MT_NORMALIZE;
892 if ((ZTOZSB(zp)->z_case == ZFS_CASE_INSENSITIVE &&
893 (flag & ZCIEXACT)) ||
894 (ZTOZSB(zp)->z_case == ZFS_CASE_MIXED &&
895 !(flag & ZCILOOK))) {
899 error = zap_remove_norm(ZTOZSB(zp)->z_os, dzp->z_id,
900 dl->dl_name, mt, tx);
902 error = zap_remove(ZTOZSB(zp)->z_os, dzp->z_id, dl->dl_name,
910 * Unlink zp from dl, and mark zp for deletion if this was the last link. Can
911 * fail if zp is a mount point (EBUSY) or a non-empty directory (ENOTEMPTY).
912 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list.
913 * If it's non-NULL, we use it to indicate whether the znode needs deletion,
914 * and it's the caller's job to do it.
917 zfs_link_destroy(zfs_dirlock_t *dl, znode_t *zp, dmu_tx_t *tx, int flag,
918 boolean_t *unlinkedp)
920 znode_t *dzp = dl->dl_dzp;
921 zfsvfs_t *zfsvfs = ZTOZSB(dzp);
922 int zp_is_dir = S_ISDIR(ZTOI(zp)->i_mode);
923 boolean_t unlinked = B_FALSE;
924 sa_bulk_attr_t bulk[5];
925 uint64_t mtime[2], ctime[2];
930 if (!(flag & ZRENAMING)) {
931 mutex_enter(&zp->z_lock);
933 if (zp_is_dir && !zfs_dirempty(zp)) {
934 mutex_exit(&zp->z_lock);
935 return (SET_ERROR(ENOTEMPTY));
939 * If we get here, we are going to try to remove the object.
940 * First try removing the name from the directory; if that
941 * fails, return the error.
943 error = zfs_dropname(dl, zp, dzp, tx, flag);
945 mutex_exit(&zp->z_lock);
949 if (ZTOI(zp)->i_nlink <= zp_is_dir) {
950 zfs_panic_recover("zfs: link count on %lu is %u, "
951 "should be at least %u", zp->z_id,
952 (int)ZTOI(zp)->i_nlink, zp_is_dir + 1);
953 set_nlink(ZTOI(zp), zp_is_dir + 1);
955 drop_nlink(ZTOI(zp));
956 if (ZTOI(zp)->i_nlink == zp_is_dir) {
957 zp->z_unlinked = B_TRUE;
958 clear_nlink(ZTOI(zp));
961 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
962 NULL, &ctime, sizeof (ctime));
963 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
964 NULL, &zp->z_pflags, sizeof (zp->z_pflags));
965 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime,
968 links = ZTOI(zp)->i_nlink;
969 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
970 NULL, &links, sizeof (links));
971 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
974 mutex_exit(&zp->z_lock);
976 error = zfs_dropname(dl, zp, dzp, tx, flag);
981 mutex_enter(&dzp->z_lock);
982 dzp->z_size--; /* one dirent removed */
984 drop_nlink(ZTOI(dzp)); /* ".." link from zp */
985 links = ZTOI(dzp)->i_nlink;
986 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs),
987 NULL, &links, sizeof (links));
988 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
989 NULL, &dzp->z_size, sizeof (dzp->z_size));
990 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs),
991 NULL, ctime, sizeof (ctime));
992 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs),
993 NULL, mtime, sizeof (mtime));
994 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
995 NULL, &dzp->z_pflags, sizeof (dzp->z_pflags));
996 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime);
997 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx);
999 mutex_exit(&dzp->z_lock);
1001 if (unlinkedp != NULL)
1002 *unlinkedp = unlinked;
1004 zfs_unlinked_add(zp, tx);
1010 * Indicate whether the directory is empty. Works with or without z_lock
1011 * held, but can only be consider a hint in the latter case. Returns true
1012 * if only "." and ".." remain and there's no work in progress.
1014 * The internal ZAP size, rather than zp->z_size, needs to be checked since
1015 * some consumers (Lustre) do not strictly maintain an accurate SA_ZPL_SIZE.
1018 zfs_dirempty(znode_t *dzp)
1020 zfsvfs_t *zfsvfs = ZTOZSB(dzp);
1024 if (dzp->z_dirlocks != NULL)
1027 error = zap_count(zfsvfs->z_os, dzp->z_id, &count);
1028 if (error != 0 || count != 0)
1035 zfs_make_xattrdir(znode_t *zp, vattr_t *vap, struct inode **xipp, cred_t *cr)
1037 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1041 zfs_acl_ids_t acl_ids;
1042 boolean_t fuid_dirtied;
1049 if ((error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr)))
1052 if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
1055 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zp->z_projid)) {
1056 zfs_acl_ids_free(&acl_ids);
1057 return (SET_ERROR(EDQUOT));
1060 tx = dmu_tx_create(zfsvfs->z_os);
1061 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes +
1062 ZFS_SA_BASE_ATTR_SIZE);
1063 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1064 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
1065 fuid_dirtied = zfsvfs->z_fuid_dirty;
1067 zfs_fuid_txhold(zfsvfs, tx);
1068 error = dmu_tx_assign(tx, TXG_WAIT);
1070 zfs_acl_ids_free(&acl_ids);
1074 zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids);
1077 zfs_fuid_sync(zfsvfs, tx);
1080 error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs),
1081 &parent, sizeof (parent));
1082 ASSERT(error == 0 && parent == zp->z_id);
1085 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id,
1086 sizeof (xzp->z_id), tx));
1088 if (!zp->z_unlinked)
1089 (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp,
1090 xzp, "", NULL, acl_ids.z_fuidp, vap);
1092 zfs_acl_ids_free(&acl_ids);
1101 * Return a znode for the extended attribute directory for zp.
1102 * ** If the directory does not already exist, it is created **
1104 * IN: zp - znode to obtain attribute directory from
1105 * cr - credentials of caller
1106 * flags - flags from the VOP_LOOKUP call
1108 * OUT: xipp - pointer to extended attribute znode
1110 * RETURN: 0 on success
1111 * error number on failure
1114 zfs_get_xattrdir(znode_t *zp, struct inode **xipp, cred_t *cr, int flags)
1116 zfsvfs_t *zfsvfs = ZTOZSB(zp);
1122 error = zfs_dirent_lock(&dl, zp, "", &xzp, ZXATTR, NULL, NULL);
1128 zfs_dirent_unlock(dl);
1132 if (!(flags & CREATE_XATTR_DIR)) {
1133 zfs_dirent_unlock(dl);
1134 return (SET_ERROR(ENOENT));
1137 if (zfs_is_readonly(zfsvfs)) {
1138 zfs_dirent_unlock(dl);
1139 return (SET_ERROR(EROFS));
1143 * The ability to 'create' files in an attribute
1144 * directory comes from the write_xattr permission on the base file.
1146 * The ability to 'search' an attribute directory requires
1147 * read_xattr permission on the base file.
1149 * Once in a directory the ability to read/write attributes
1150 * is controlled by the permissions on the attribute file.
1152 va.va_mask = ATTR_MODE | ATTR_UID | ATTR_GID;
1153 va.va_mode = S_IFDIR | S_ISVTX | 0777;
1154 zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid);
1156 va.va_dentry = NULL;
1157 error = zfs_make_xattrdir(zp, &va, xipp, cr);
1158 zfs_dirent_unlock(dl);
1160 if (error == ERESTART) {
1161 /* NB: we already did dmu_tx_wait() if necessary */
1169 * Decide whether it is okay to remove within a sticky directory.
1171 * In sticky directories, write access is not sufficient;
1172 * you can remove entries from a directory only if:
1174 * you own the directory,
1175 * you own the entry,
1176 * you have write access to the entry,
1177 * or you are privileged (checked in secpolicy...).
1179 * The function returns 0 if remove access is granted.
1182 zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
1187 zfsvfs_t *zfsvfs = ZTOZSB(zdp);
1189 if (zfsvfs->z_replay)
1192 if ((zdp->z_mode & S_ISVTX) == 0)
1195 downer = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zdp)->i_uid),
1197 fowner = zfs_fuid_map_id(zfsvfs, KUID_TO_SUID(ZTOI(zp)->i_uid),
1200 if ((uid = crgetuid(cr)) == downer || uid == fowner ||
1201 zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0)
1204 return (secpolicy_vnode_remove(cr));