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) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>.
24 * All rights reserved.
27 /* Portions Copyright 2010 Robert Milkowski */
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/sysmacros.h>
36 #include <sys/vnode.h>
38 #include <sys/mntent.h>
39 #include <sys/mount.h>
40 #include <sys/cmn_err.h>
41 #include <sys/zfs_znode.h>
42 #include <sys/zfs_dir.h>
44 #include <sys/fs/zfs.h>
46 #include <sys/dsl_prop.h>
47 #include <sys/dsl_dataset.h>
48 #include <sys/dsl_deleg.h>
52 #include <sys/varargs.h>
53 #include <sys/policy.h>
54 #include <sys/atomic.h>
55 #include <sys/zfs_ioctl.h>
56 #include <sys/zfs_ctldir.h>
57 #include <sys/zfs_fuid.h>
58 #include <sys/sunddi.h>
60 #include <sys/dmu_objset.h>
61 #include <sys/spa_boot.h>
64 #include "zfs_comutil.h"
66 struct mtx zfs_debug_mtx;
67 MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF);
69 SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system");
72 SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0,
73 "File system owner can perform privileged operation on his file systems");
76 TUNABLE_INT("vfs.zfs.debug", &zfs_debug_level);
77 SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RW, &zfs_debug_level, 0,
80 SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions");
81 static int zfs_version_acl = ZFS_ACL_VERSION;
82 SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0,
84 static int zfs_version_spa = SPA_VERSION;
85 SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0,
87 static int zfs_version_zpl = ZPL_VERSION;
88 SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0,
91 static int zfs_mount(vfs_t *vfsp);
92 static int zfs_umount(vfs_t *vfsp, int fflag);
93 static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp);
94 static int zfs_statfs(vfs_t *vfsp, struct statfs *statp);
95 static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp);
96 static int zfs_sync(vfs_t *vfsp, int waitfor);
97 static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
98 struct ucred **credanonp, int *numsecflavors, int **secflavors);
99 static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp);
100 static void zfs_objset_close(zfsvfs_t *zfsvfs);
101 static void zfs_freevfs(vfs_t *vfsp);
103 static struct vfsops zfs_vfsops = {
104 .vfs_mount = zfs_mount,
105 .vfs_unmount = zfs_umount,
106 .vfs_root = zfs_root,
107 .vfs_statfs = zfs_statfs,
108 .vfs_vget = zfs_vget,
109 .vfs_sync = zfs_sync,
110 .vfs_checkexp = zfs_checkexp,
111 .vfs_fhtovp = zfs_fhtovp,
114 VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN);
117 * We need to keep a count of active fs's.
118 * This is necessary to prevent our module
119 * from being unloaded after a umount -f
121 static uint32_t zfs_active_fs_count = 0;
125 zfs_sync(vfs_t *vfsp, int waitfor)
129 * Data integrity is job one. We don't want a compromised kernel
130 * writing to the storage pool, so we never sync during panic.
137 * Sync a specific filesystem.
139 zfsvfs_t *zfsvfs = vfsp->vfs_data;
143 error = vfs_stdsync(vfsp, waitfor);
148 dp = dmu_objset_pool(zfsvfs->z_os);
151 * If the system is shutting down, then skip any
152 * filesystems which may exist on a suspended pool.
154 if (sys_shutdown && spa_suspended(dp->dp_spa)) {
159 if (zfsvfs->z_log != NULL)
160 zil_commit(zfsvfs->z_log, 0);
165 * Sync all ZFS filesystems. This is what happens when you
166 * run sync(1M). Unlike other filesystems, ZFS honors the
167 * request by waiting for all pools to commit all dirty data.
177 zfs_create_unique_device(dev_t *dev)
182 ASSERT3U(zfs_minor, <=, MAXMIN32);
183 minor_t start = zfs_minor;
185 mutex_enter(&zfs_dev_mtx);
186 if (zfs_minor >= MAXMIN32) {
188 * If we're still using the real major
189 * keep out of /dev/zfs and /dev/zvol minor
190 * number space. If we're using a getudev()'ed
191 * major number, we can use all of its minors.
193 if (zfs_major == ddi_name_to_major(ZFS_DRIVER))
194 zfs_minor = ZFS_MIN_MINOR;
200 *dev = makedevice(zfs_major, zfs_minor);
201 mutex_exit(&zfs_dev_mtx);
202 } while (vfs_devismounted(*dev) && zfs_minor != start);
203 if (zfs_minor == start) {
205 * We are using all ~262,000 minor numbers for the
206 * current major number. Create a new major number.
208 if ((new_major = getudev()) == (major_t)-1) {
210 "zfs_mount: Can't get unique major "
214 mutex_enter(&zfs_dev_mtx);
215 zfs_major = new_major;
218 mutex_exit(&zfs_dev_mtx);
222 /* CONSTANTCONDITION */
227 #endif /* !__FreeBSD__ */
230 atime_changed_cb(void *arg, uint64_t newval)
232 zfsvfs_t *zfsvfs = arg;
234 if (newval == TRUE) {
235 zfsvfs->z_atime = TRUE;
236 zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME;
237 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME);
238 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0);
240 zfsvfs->z_atime = FALSE;
241 zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME;
242 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME);
243 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0);
248 xattr_changed_cb(void *arg, uint64_t newval)
250 zfsvfs_t *zfsvfs = arg;
252 if (newval == TRUE) {
253 /* XXX locking on vfs_flag? */
255 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR;
257 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR);
258 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0);
260 /* XXX locking on vfs_flag? */
262 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR;
264 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR);
265 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0);
270 blksz_changed_cb(void *arg, uint64_t newval)
272 zfsvfs_t *zfsvfs = arg;
274 if (newval < SPA_MINBLOCKSIZE ||
275 newval > SPA_MAXBLOCKSIZE || !ISP2(newval))
276 newval = SPA_MAXBLOCKSIZE;
278 zfsvfs->z_max_blksz = newval;
279 zfsvfs->z_vfs->mnt_stat.f_iosize = newval;
283 readonly_changed_cb(void *arg, uint64_t newval)
285 zfsvfs_t *zfsvfs = arg;
288 /* XXX locking on vfs_flag? */
289 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY;
290 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW);
291 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0);
293 /* XXX locking on vfs_flag? */
294 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
295 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO);
296 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0);
301 setuid_changed_cb(void *arg, uint64_t newval)
303 zfsvfs_t *zfsvfs = arg;
305 if (newval == FALSE) {
306 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID;
307 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID);
308 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0);
310 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID;
311 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID);
312 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0);
317 exec_changed_cb(void *arg, uint64_t newval)
319 zfsvfs_t *zfsvfs = arg;
321 if (newval == FALSE) {
322 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC;
323 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC);
324 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0);
326 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC;
327 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC);
328 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0);
333 * The nbmand mount option can be changed at mount time.
334 * We can't allow it to be toggled on live file systems or incorrect
335 * behavior may be seen from cifs clients
337 * This property isn't registered via dsl_prop_register(), but this callback
338 * will be called when a file system is first mounted
341 nbmand_changed_cb(void *arg, uint64_t newval)
343 zfsvfs_t *zfsvfs = arg;
344 if (newval == FALSE) {
345 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND);
346 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0);
348 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND);
349 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0);
354 snapdir_changed_cb(void *arg, uint64_t newval)
356 zfsvfs_t *zfsvfs = arg;
358 zfsvfs->z_show_ctldir = newval;
362 vscan_changed_cb(void *arg, uint64_t newval)
364 zfsvfs_t *zfsvfs = arg;
366 zfsvfs->z_vscan = newval;
370 acl_mode_changed_cb(void *arg, uint64_t newval)
372 zfsvfs_t *zfsvfs = arg;
374 zfsvfs->z_acl_mode = newval;
378 acl_inherit_changed_cb(void *arg, uint64_t newval)
380 zfsvfs_t *zfsvfs = arg;
382 zfsvfs->z_acl_inherit = newval;
386 zfs_register_callbacks(vfs_t *vfsp)
388 struct dsl_dataset *ds = NULL;
390 zfsvfs_t *zfsvfs = NULL;
392 int readonly, do_readonly = B_FALSE;
393 int setuid, do_setuid = B_FALSE;
394 int exec, do_exec = B_FALSE;
395 int xattr, do_xattr = B_FALSE;
396 int atime, do_atime = B_FALSE;
400 zfsvfs = vfsp->vfs_data;
405 * This function can be called for a snapshot when we update snapshot's
406 * mount point, which isn't really supported.
408 if (dmu_objset_is_snapshot(os))
412 * The act of registering our callbacks will destroy any mount
413 * options we may have. In order to enable temporary overrides
414 * of mount options, we stash away the current values and
415 * restore them after we register the callbacks.
417 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) ||
418 !spa_writeable(dmu_objset_spa(os))) {
420 do_readonly = B_TRUE;
421 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) {
423 do_readonly = B_TRUE;
425 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) {
429 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) {
432 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) {
437 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) {
440 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) {
444 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) {
447 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) {
451 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) {
454 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) {
460 * nbmand is a special property. It can only be changed at
463 * This is weird, but it is documented to only be changeable
466 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) {
468 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) {
471 char osname[MAXNAMELEN];
473 dmu_objset_name(os, osname);
474 if (error = dsl_prop_get_integer(osname, "nbmand", &nbmand,
481 * Register property callbacks.
483 * It would probably be fine to just check for i/o error from
484 * the first prop_register(), but I guess I like to go
487 ds = dmu_objset_ds(os);
488 error = dsl_prop_register(ds, "atime", atime_changed_cb, zfsvfs);
489 error = error ? error : dsl_prop_register(ds,
490 "xattr", xattr_changed_cb, zfsvfs);
491 error = error ? error : dsl_prop_register(ds,
492 "recordsize", blksz_changed_cb, zfsvfs);
493 error = error ? error : dsl_prop_register(ds,
494 "readonly", readonly_changed_cb, zfsvfs);
495 error = error ? error : dsl_prop_register(ds,
496 "setuid", setuid_changed_cb, zfsvfs);
497 error = error ? error : dsl_prop_register(ds,
498 "exec", exec_changed_cb, zfsvfs);
499 error = error ? error : dsl_prop_register(ds,
500 "snapdir", snapdir_changed_cb, zfsvfs);
501 error = error ? error : dsl_prop_register(ds,
502 "aclmode", acl_mode_changed_cb, zfsvfs);
503 error = error ? error : dsl_prop_register(ds,
504 "aclinherit", acl_inherit_changed_cb, zfsvfs);
505 error = error ? error : dsl_prop_register(ds,
506 "vscan", vscan_changed_cb, zfsvfs);
511 * Invoke our callbacks to restore temporary mount options.
514 readonly_changed_cb(zfsvfs, readonly);
516 setuid_changed_cb(zfsvfs, setuid);
518 exec_changed_cb(zfsvfs, exec);
520 xattr_changed_cb(zfsvfs, xattr);
522 atime_changed_cb(zfsvfs, atime);
524 nbmand_changed_cb(zfsvfs, nbmand);
530 * We may attempt to unregister some callbacks that are not
531 * registered, but this is OK; it will simply return ENOMSG,
532 * which we will ignore.
534 (void) dsl_prop_unregister(ds, "atime", atime_changed_cb, zfsvfs);
535 (void) dsl_prop_unregister(ds, "xattr", xattr_changed_cb, zfsvfs);
536 (void) dsl_prop_unregister(ds, "recordsize", blksz_changed_cb, zfsvfs);
537 (void) dsl_prop_unregister(ds, "readonly", readonly_changed_cb, zfsvfs);
538 (void) dsl_prop_unregister(ds, "setuid", setuid_changed_cb, zfsvfs);
539 (void) dsl_prop_unregister(ds, "exec", exec_changed_cb, zfsvfs);
540 (void) dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb, zfsvfs);
541 (void) dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb, zfsvfs);
542 (void) dsl_prop_unregister(ds, "aclinherit", acl_inherit_changed_cb,
544 (void) dsl_prop_unregister(ds, "vscan", vscan_changed_cb, zfsvfs);
550 zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
551 uint64_t *userp, uint64_t *groupp)
553 znode_phys_t *znp = data;
557 * Is it a valid type of object to track?
559 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
563 * If we have a NULL data pointer
564 * then assume the id's aren't changing and
565 * return EEXIST to the dmu to let it know to
571 if (bonustype == DMU_OT_ZNODE) {
572 *userp = znp->zp_uid;
573 *groupp = znp->zp_gid;
577 ASSERT(bonustype == DMU_OT_SA);
578 hdrsize = sa_hdrsize(data);
581 *userp = *((uint64_t *)((uintptr_t)data + hdrsize +
583 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
587 * This should only happen for newly created
588 * files that haven't had the znode data filled
599 fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr,
600 char *domainbuf, int buflen, uid_t *ridp)
605 fuid = strtonum(fuidstr, NULL);
607 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid));
609 (void) strlcpy(domainbuf, domain, buflen);
612 *ridp = FUID_RID(fuid);
616 zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type)
619 case ZFS_PROP_USERUSED:
620 return (DMU_USERUSED_OBJECT);
621 case ZFS_PROP_GROUPUSED:
622 return (DMU_GROUPUSED_OBJECT);
623 case ZFS_PROP_USERQUOTA:
624 return (zfsvfs->z_userquota_obj);
625 case ZFS_PROP_GROUPQUOTA:
626 return (zfsvfs->z_groupquota_obj);
632 zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
633 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep)
638 zfs_useracct_t *buf = vbuf;
641 if (!dmu_objset_userspace_present(zfsvfs->z_os))
644 obj = zfs_userquota_prop_to_obj(zfsvfs, type);
650 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep);
651 (error = zap_cursor_retrieve(&zc, &za)) == 0;
652 zap_cursor_advance(&zc)) {
653 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) >
657 fuidstr_to_sid(zfsvfs, za.za_name,
658 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid);
660 buf->zu_space = za.za_first_integer;
666 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep);
667 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf;
668 *cookiep = zap_cursor_serialize(&zc);
669 zap_cursor_fini(&zc);
674 * buf must be big enough (eg, 32 bytes)
677 id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid,
678 char *buf, boolean_t addok)
683 if (domain && domain[0]) {
684 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok);
688 fuid = FUID_ENCODE(domainid, rid);
689 (void) sprintf(buf, "%llx", (longlong_t)fuid);
694 zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
695 const char *domain, uint64_t rid, uint64_t *valp)
703 if (!dmu_objset_userspace_present(zfsvfs->z_os))
706 obj = zfs_userquota_prop_to_obj(zfsvfs, type);
710 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE);
714 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp);
721 zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
722 const char *domain, uint64_t rid, uint64_t quota)
728 boolean_t fuid_dirtied;
730 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA)
733 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE)
736 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj :
737 &zfsvfs->z_groupquota_obj;
739 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE);
742 fuid_dirtied = zfsvfs->z_fuid_dirty;
744 tx = dmu_tx_create(zfsvfs->z_os);
745 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL);
747 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
748 zfs_userquota_prop_prefixes[type]);
751 zfs_fuid_txhold(zfsvfs, tx);
752 err = dmu_tx_assign(tx, TXG_WAIT);
758 mutex_enter(&zfsvfs->z_lock);
760 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA,
762 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
763 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx));
765 mutex_exit(&zfsvfs->z_lock);
768 err = zap_remove(zfsvfs->z_os, *objp, buf, tx);
772 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx);
776 zfs_fuid_sync(zfsvfs, tx);
782 zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid)
785 uint64_t used, quota, usedobj, quotaobj;
788 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT;
789 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
791 if (quotaobj == 0 || zfsvfs->z_replay)
794 (void) sprintf(buf, "%llx", (longlong_t)fuid);
795 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a);
799 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used);
802 return (used >= quota);
806 zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup)
811 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
813 fuid = isgroup ? zp->z_gid : zp->z_uid;
815 if (quotaobj == 0 || zfsvfs->z_replay)
818 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid));
822 zfsvfs_create(const char *osname, zfsvfs_t **zfvp)
830 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
833 * We claim to always be readonly so we can open snapshots;
834 * other ZPL code will prevent us from writing to snapshots.
836 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os);
838 kmem_free(zfsvfs, sizeof (zfsvfs_t));
843 * Initialize the zfs-specific filesystem structure.
844 * Should probably make this a kmem cache, shuffle fields,
845 * and just bzero up to z_hold_mtx[].
847 zfsvfs->z_vfs = NULL;
848 zfsvfs->z_parent = zfsvfs;
849 zfsvfs->z_max_blksz = SPA_MAXBLOCKSIZE;
850 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
853 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version);
856 } else if (zfsvfs->z_version >
857 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
858 (void) printf("Can't mount a version %lld file system "
859 "on a version %lld pool\n. Pool must be upgraded to mount "
860 "this file system.", (u_longlong_t)zfsvfs->z_version,
861 (u_longlong_t)spa_version(dmu_objset_spa(os)));
865 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0)
867 zfsvfs->z_norm = (int)zval;
869 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0)
871 zfsvfs->z_utf8 = (zval != 0);
873 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0)
875 zfsvfs->z_case = (uint_t)zval;
878 * Fold case on file systems that are always or sometimes case
881 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
882 zfsvfs->z_case == ZFS_CASE_MIXED)
883 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
885 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
886 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
888 if (zfsvfs->z_use_sa) {
889 /* should either have both of these objects or none */
890 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1,
896 * Pre SA versions file systems should never touch
897 * either the attribute registration or layout objects.
902 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
903 &zfsvfs->z_attr_table);
907 if (zfsvfs->z_version >= ZPL_VERSION_SA)
908 sa_register_update_callback(os, zfs_sa_upgrade);
910 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
914 ASSERT(zfsvfs->z_root != 0);
916 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
917 &zfsvfs->z_unlinkedobj);
921 error = zap_lookup(os, MASTER_NODE_OBJ,
922 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
923 8, 1, &zfsvfs->z_userquota_obj);
924 if (error && error != ENOENT)
927 error = zap_lookup(os, MASTER_NODE_OBJ,
928 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
929 8, 1, &zfsvfs->z_groupquota_obj);
930 if (error && error != ENOENT)
933 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
934 &zfsvfs->z_fuid_obj);
935 if (error && error != ENOENT)
938 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
939 &zfsvfs->z_shares_dir);
940 if (error && error != ENOENT)
943 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
944 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL);
945 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
946 offsetof(znode_t, z_link_node));
947 rrw_init(&zfsvfs->z_teardown_lock);
948 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
949 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
950 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
951 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
957 dmu_objset_disown(os, zfsvfs);
959 kmem_free(zfsvfs, sizeof (zfsvfs_t));
964 zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
968 error = zfs_register_callbacks(zfsvfs->z_vfs);
973 * Set the objset user_ptr to track its zfsvfs.
975 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
976 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
977 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
979 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
982 * If we are not mounting (ie: online recv), then we don't
983 * have to worry about replaying the log as we blocked all
984 * operations out since we closed the ZIL.
990 * During replay we remove the read only flag to
991 * allow replays to succeed.
993 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY;
995 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
997 zfs_unlinked_drain(zfsvfs);
1000 * Parse and replay the intent log.
1002 * Because of ziltest, this must be done after
1003 * zfs_unlinked_drain(). (Further note: ziltest
1004 * doesn't use readonly mounts, where
1005 * zfs_unlinked_drain() isn't called.) This is because
1006 * ziltest causes spa_sync() to think it's committed,
1007 * but actually it is not, so the intent log contains
1008 * many txg's worth of changes.
1010 * In particular, if object N is in the unlinked set in
1011 * the last txg to actually sync, then it could be
1012 * actually freed in a later txg and then reallocated
1013 * in a yet later txg. This would write a "create
1014 * object N" record to the intent log. Normally, this
1015 * would be fine because the spa_sync() would have
1016 * written out the fact that object N is free, before
1017 * we could write the "create object N" intent log
1020 * But when we are in ziltest mode, we advance the "open
1021 * txg" without actually spa_sync()-ing the changes to
1022 * disk. So we would see that object N is still
1023 * allocated and in the unlinked set, and there is an
1024 * intent log record saying to allocate it.
1026 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) {
1027 if (zil_replay_disable) {
1028 zil_destroy(zfsvfs->z_log, B_FALSE);
1030 zfsvfs->z_replay = B_TRUE;
1031 zil_replay(zfsvfs->z_os, zfsvfs,
1033 zfsvfs->z_replay = B_FALSE;
1036 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */
1042 extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */
1045 zfsvfs_free(zfsvfs_t *zfsvfs)
1050 * This is a barrier to prevent the filesystem from going away in
1051 * zfs_znode_move() until we can safely ensure that the filesystem is
1052 * not unmounted. We consider the filesystem valid before the barrier
1053 * and invalid after the barrier.
1055 rw_enter(&zfsvfs_lock, RW_READER);
1056 rw_exit(&zfsvfs_lock);
1058 zfs_fuid_destroy(zfsvfs);
1060 mutex_destroy(&zfsvfs->z_znodes_lock);
1061 mutex_destroy(&zfsvfs->z_lock);
1062 list_destroy(&zfsvfs->z_all_znodes);
1063 rrw_destroy(&zfsvfs->z_teardown_lock);
1064 rw_destroy(&zfsvfs->z_teardown_inactive_lock);
1065 rw_destroy(&zfsvfs->z_fuid_lock);
1066 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1067 mutex_destroy(&zfsvfs->z_hold_mtx[i]);
1068 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1072 zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
1074 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
1075 if (zfsvfs->z_vfs) {
1076 if (zfsvfs->z_use_fuids) {
1077 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
1078 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
1079 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
1080 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
1081 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
1082 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
1084 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
1085 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
1086 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
1087 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
1088 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
1089 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
1092 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
1096 zfs_domount(vfs_t *vfsp, char *osname)
1098 uint64_t recordsize, fsid_guid;
1106 error = zfsvfs_create(osname, &zfsvfs);
1109 zfsvfs->z_vfs = vfsp;
1111 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize,
1114 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE;
1115 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize;
1117 vfsp->vfs_data = zfsvfs;
1118 vfsp->mnt_flag |= MNT_LOCAL;
1119 vfsp->mnt_kern_flag |= MNTK_MPSAFE;
1120 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
1121 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES;
1124 * The fsid is 64 bits, composed of an 8-bit fs type, which
1125 * separates our fsid from any other filesystem types, and a
1126 * 56-bit objset unique ID. The objset unique ID is unique to
1127 * all objsets open on this system, provided by unique_create().
1128 * The 8-bit fs type must be put in the low bits of fsid[1]
1129 * because that's where other Solaris filesystems put it.
1131 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os);
1132 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
1133 vfsp->vfs_fsid.val[0] = fsid_guid;
1134 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
1135 vfsp->mnt_vfc->vfc_typenum & 0xFF;
1138 * Set features for file system.
1140 zfs_set_fuid_feature(zfsvfs);
1141 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
1142 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1143 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1144 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE);
1145 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) {
1146 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1147 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1149 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED);
1151 if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
1154 atime_changed_cb(zfsvfs, B_FALSE);
1155 readonly_changed_cb(zfsvfs, B_TRUE);
1156 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL))
1158 xattr_changed_cb(zfsvfs, pval);
1159 zfsvfs->z_issnap = B_TRUE;
1160 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED;
1162 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
1163 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
1164 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
1166 error = zfsvfs_setup(zfsvfs, B_TRUE);
1169 vfs_mountedfrom(vfsp, osname);
1170 /* Grab extra reference. */
1171 VERIFY(VFS_ROOT(vfsp, LK_EXCLUSIVE, &vp) == 0);
1174 if (!zfsvfs->z_issnap)
1175 zfsctl_create(zfsvfs);
1178 dmu_objset_disown(zfsvfs->z_os, zfsvfs);
1179 zfsvfs_free(zfsvfs);
1181 atomic_add_32(&zfs_active_fs_count, 1);
1188 zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
1190 objset_t *os = zfsvfs->z_os;
1191 struct dsl_dataset *ds;
1194 * Unregister properties.
1196 if (!dmu_objset_is_snapshot(os)) {
1197 ds = dmu_objset_ds(os);
1198 VERIFY(dsl_prop_unregister(ds, "atime", atime_changed_cb,
1201 VERIFY(dsl_prop_unregister(ds, "xattr", xattr_changed_cb,
1204 VERIFY(dsl_prop_unregister(ds, "recordsize", blksz_changed_cb,
1207 VERIFY(dsl_prop_unregister(ds, "readonly", readonly_changed_cb,
1210 VERIFY(dsl_prop_unregister(ds, "setuid", setuid_changed_cb,
1213 VERIFY(dsl_prop_unregister(ds, "exec", exec_changed_cb,
1216 VERIFY(dsl_prop_unregister(ds, "snapdir", snapdir_changed_cb,
1219 VERIFY(dsl_prop_unregister(ds, "aclmode", acl_mode_changed_cb,
1222 VERIFY(dsl_prop_unregister(ds, "aclinherit",
1223 acl_inherit_changed_cb, zfsvfs) == 0);
1225 VERIFY(dsl_prop_unregister(ds, "vscan",
1226 vscan_changed_cb, zfsvfs) == 0);
1232 * Convert a decimal digit string to a uint64_t integer.
1235 str_to_uint64(char *str, uint64_t *objnum)
1240 if (*str < '0' || *str > '9')
1243 num = num*10 + *str++ - '0';
1251 * The boot path passed from the boot loader is in the form of
1252 * "rootpool-name/root-filesystem-object-number'. Convert this
1253 * string to a dataset name: "rootpool-name/root-filesystem-name".
1256 zfs_parse_bootfs(char *bpath, char *outpath)
1262 if (*bpath == 0 || *bpath == '/')
1265 (void) strcpy(outpath, bpath);
1267 slashp = strchr(bpath, '/');
1269 /* if no '/', just return the pool name */
1270 if (slashp == NULL) {
1274 /* if not a number, just return the root dataset name */
1275 if (str_to_uint64(slashp+1, &objnum)) {
1280 error = dsl_dsobj_to_dsname(bpath, objnum, outpath);
1287 * zfs_check_global_label:
1288 * Check that the hex label string is appropriate for the dataset
1289 * being mounted into the global_zone proper.
1291 * Return an error if the hex label string is not default or
1292 * admin_low/admin_high. For admin_low labels, the corresponding
1293 * dataset must be readonly.
1296 zfs_check_global_label(const char *dsname, const char *hexsl)
1298 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1300 if (strcasecmp(hexsl, ADMIN_HIGH) == 0)
1302 if (strcasecmp(hexsl, ADMIN_LOW) == 0) {
1303 /* must be readonly */
1306 if (dsl_prop_get_integer(dsname,
1307 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL))
1309 return (rdonly ? 0 : EACCES);
1315 * zfs_mount_label_policy:
1316 * Determine whether the mount is allowed according to MAC check.
1317 * by comparing (where appropriate) label of the dataset against
1318 * the label of the zone being mounted into. If the dataset has
1319 * no label, create one.
1322 * 0 : access allowed
1323 * >0 : error code, such as EACCES
1326 zfs_mount_label_policy(vfs_t *vfsp, char *osname)
1329 zone_t *mntzone = NULL;
1330 ts_label_t *mnt_tsl;
1333 char ds_hexsl[MAXNAMELEN];
1335 retv = EACCES; /* assume the worst */
1338 * Start by getting the dataset label if it exists.
1340 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1341 1, sizeof (ds_hexsl), &ds_hexsl, NULL);
1346 * If labeling is NOT enabled, then disallow the mount of datasets
1347 * which have a non-default label already. No other label checks
1350 if (!is_system_labeled()) {
1351 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1357 * Get the label of the mountpoint. If mounting into the global
1358 * zone (i.e. mountpoint is not within an active zone and the
1359 * zoned property is off), the label must be default or
1360 * admin_low/admin_high only; no other checks are needed.
1362 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE);
1363 if (mntzone->zone_id == GLOBAL_ZONEID) {
1368 if (dsl_prop_get_integer(osname,
1369 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL))
1372 return (zfs_check_global_label(osname, ds_hexsl));
1375 * This is the case of a zone dataset being mounted
1376 * initially, before the zone has been fully created;
1377 * allow this mount into global zone.
1382 mnt_tsl = mntzone->zone_slabel;
1383 ASSERT(mnt_tsl != NULL);
1384 label_hold(mnt_tsl);
1385 mnt_sl = label2bslabel(mnt_tsl);
1387 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) {
1389 * The dataset doesn't have a real label, so fabricate one.
1393 if (l_to_str_internal(mnt_sl, &str) == 0 &&
1394 dsl_prop_set(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1395 ZPROP_SRC_LOCAL, 1, strlen(str) + 1, str) == 0)
1398 kmem_free(str, strlen(str) + 1);
1399 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) {
1401 * Now compare labels to complete the MAC check. If the
1402 * labels are equal then allow access. If the mountpoint
1403 * label dominates the dataset label, allow readonly access.
1404 * Otherwise, access is denied.
1406 if (blequal(mnt_sl, &ds_sl))
1408 else if (bldominates(mnt_sl, &ds_sl)) {
1409 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0);
1414 label_rele(mnt_tsl);
1418 #endif /* SECLABEL */
1420 #ifdef OPENSOLARIS_MOUNTROOT
1422 zfs_mountroot(vfs_t *vfsp, enum whymountroot why)
1425 static int zfsrootdone = 0;
1426 zfsvfs_t *zfsvfs = NULL;
1435 * The filesystem that we mount as root is defined in the
1436 * boot property "zfs-bootfs" with a format of
1437 * "poolname/root-dataset-objnum".
1439 if (why == ROOT_INIT) {
1443 * the process of doing a spa_load will require the
1444 * clock to be set before we could (for example) do
1445 * something better by looking at the timestamp on
1446 * an uberblock, so just set it to -1.
1450 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) {
1451 cmn_err(CE_NOTE, "spa_get_bootfs: can not get "
1455 zfs_devid = spa_get_bootprop("diskdevid");
1456 error = spa_import_rootpool(rootfs.bo_name, zfs_devid);
1458 spa_free_bootprop(zfs_devid);
1460 spa_free_bootprop(zfs_bootfs);
1461 cmn_err(CE_NOTE, "spa_import_rootpool: error %d",
1465 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) {
1466 spa_free_bootprop(zfs_bootfs);
1467 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d",
1472 spa_free_bootprop(zfs_bootfs);
1474 if (error = vfs_lock(vfsp))
1477 if (error = zfs_domount(vfsp, rootfs.bo_name)) {
1478 cmn_err(CE_NOTE, "zfs_domount: error %d", error);
1482 zfsvfs = (zfsvfs_t *)vfsp->vfs_data;
1484 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) {
1485 cmn_err(CE_NOTE, "zfs_zget: error %d", error);
1490 mutex_enter(&vp->v_lock);
1491 vp->v_flag |= VROOT;
1492 mutex_exit(&vp->v_lock);
1496 * Leave rootvp held. The root file system is never unmounted.
1499 vfs_add((struct vnode *)0, vfsp,
1500 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0);
1504 } else if (why == ROOT_REMOUNT) {
1505 readonly_changed_cb(vfsp->vfs_data, B_FALSE);
1506 vfsp->vfs_flag |= VFS_REMOUNT;
1508 /* refresh mount options */
1509 zfs_unregister_callbacks(vfsp->vfs_data);
1510 return (zfs_register_callbacks(vfsp));
1512 } else if (why == ROOT_UNMOUNT) {
1513 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data);
1514 (void) zfs_sync(vfsp, 0, 0);
1519 * if "why" is equal to anything else other than ROOT_INIT,
1520 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it.
1524 #endif /* OPENSOLARIS_MOUNTROOT */
1528 zfs_mount(vfs_t *vfsp)
1530 kthread_t *td = curthread;
1531 vnode_t *mvp = vfsp->mnt_vnodecovered;
1532 cred_t *cr = td->td_ucred;
1537 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS))
1540 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
1544 * If full-owner-access is enabled and delegated administration is
1545 * turned on, we must set nosuid.
1547 if (zfs_super_owner &&
1548 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) {
1549 secpolicy_fs_mount_clearopts(cr, vfsp);
1553 * Check for mount privilege?
1555 * If we don't have privilege then see if
1556 * we have local permission to allow it
1558 error = secpolicy_fs_mount(cr, mvp, vfsp);
1560 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0)
1563 if (!(vfsp->vfs_flag & MS_REMOUNT)) {
1567 * Make sure user is the owner of the mount point
1568 * or has sufficient privileges.
1571 vattr.va_mask = AT_UID;
1573 vn_lock(mvp, LK_SHARED | LK_RETRY);
1574 if (VOP_GETATTR(mvp, &vattr, cr)) {
1579 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
1580 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) {
1587 secpolicy_fs_mount_clearopts(cr, vfsp);
1591 * Refuse to mount a filesystem if we are in a local zone and the
1592 * dataset is not visible.
1594 if (!INGLOBALZONE(curthread) &&
1595 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) {
1601 error = zfs_mount_label_policy(vfsp, osname);
1606 vfsp->vfs_flag |= MNT_NFS4ACLS;
1609 * When doing a remount, we simply refresh our temporary properties
1610 * according to those options set in the current VFS options.
1612 if (vfsp->vfs_flag & MS_REMOUNT) {
1613 /* refresh mount options */
1614 zfs_unregister_callbacks(vfsp->vfs_data);
1615 error = zfs_register_callbacks(vfsp);
1620 error = zfs_domount(vfsp, osname);
1625 * Add an extra VFS_HOLD on our parent vfs so that it can't
1626 * disappear due to a forced unmount.
1628 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap)
1629 VFS_HOLD(mvp->v_vfsp);
1637 zfs_statfs(vfs_t *vfsp, struct statfs *statp)
1639 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1640 uint64_t refdbytes, availbytes, usedobjs, availobjs;
1642 statp->f_version = STATFS_VERSION;
1646 dmu_objset_space(zfsvfs->z_os,
1647 &refdbytes, &availbytes, &usedobjs, &availobjs);
1650 * The underlying storage pool actually uses multiple block sizes.
1651 * We report the fragsize as the smallest block size we support,
1652 * and we report our blocksize as the filesystem's maximum blocksize.
1654 statp->f_bsize = SPA_MINBLOCKSIZE;
1655 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize;
1658 * The following report "total" blocks of various kinds in the
1659 * file system, but reported in terms of f_frsize - the
1663 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT;
1664 statp->f_bfree = availbytes / statp->f_bsize;
1665 statp->f_bavail = statp->f_bfree; /* no root reservation */
1668 * statvfs() should really be called statufs(), because it assumes
1669 * static metadata. ZFS doesn't preallocate files, so the best
1670 * we can do is report the max that could possibly fit in f_files,
1671 * and that minus the number actually used in f_ffree.
1672 * For f_ffree, report the smaller of the number of object available
1673 * and the number of blocks (each object will take at least a block).
1675 statp->f_ffree = MIN(availobjs, statp->f_bfree);
1676 statp->f_files = statp->f_ffree + usedobjs;
1679 * We're a zfs filesystem.
1681 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename));
1683 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname,
1684 sizeof(statp->f_mntfromname));
1685 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname,
1686 sizeof(statp->f_mntonname));
1688 statp->f_namemax = ZFS_MAXNAMELEN;
1695 zfs_vnode_lock(vnode_t *vp, int flags)
1702 * Check if the file system wasn't forcibly unmounted in the meantime.
1704 error = vn_lock(vp, flags);
1705 if (error == 0 && (vp->v_iflag & VI_DOOMED) != 0) {
1714 zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp)
1716 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1720 ZFS_ENTER_NOERROR(zfsvfs);
1722 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp);
1724 *vpp = ZTOV(rootzp);
1729 error = zfs_vnode_lock(*vpp, flags);
1731 (*vpp)->v_vflag |= VV_ROOT;
1740 * Teardown the zfsvfs::z_os.
1742 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock'
1743 * and 'z_teardown_inactive_lock' held.
1746 zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
1750 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1754 * We purge the parent filesystem's vfsp as the parent
1755 * filesystem and all of its snapshots have their vnode's
1756 * v_vfsp set to the parent's filesystem's vfsp. Note,
1757 * 'z_parent' is self referential for non-snapshots.
1759 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1760 #ifdef FREEBSD_NAMECACHE
1761 cache_purgevfs(zfsvfs->z_parent->z_vfs);
1766 * Close the zil. NB: Can't close the zil while zfs_inactive
1767 * threads are blocked as zil_close can call zfs_inactive.
1769 if (zfsvfs->z_log) {
1770 zil_close(zfsvfs->z_log);
1771 zfsvfs->z_log = NULL;
1774 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER);
1777 * If we are not unmounting (ie: online recv) and someone already
1778 * unmounted this file system while we were doing the switcheroo,
1779 * or a reopen of z_os failed then just bail out now.
1781 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) {
1782 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1783 rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
1788 * At this point there are no vops active, and any new vops will
1789 * fail with EIO since we have z_teardown_lock for writer (only
1790 * relavent for forced unmount).
1792 * Release all holds on dbufs.
1794 mutex_enter(&zfsvfs->z_znodes_lock);
1795 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL;
1796 zp = list_next(&zfsvfs->z_all_znodes, zp))
1798 ASSERT(ZTOV(zp)->v_count >= 0);
1799 zfs_znode_dmu_fini(zp);
1801 mutex_exit(&zfsvfs->z_znodes_lock);
1804 * If we are unmounting, set the unmounted flag and let new vops
1805 * unblock. zfs_inactive will have the unmounted behavior, and all
1806 * other vops will fail with EIO.
1809 zfsvfs->z_unmounted = B_TRUE;
1810 rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
1811 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1815 * Some znodes might not be fully reclaimed, wait for them.
1817 mutex_enter(&zfsvfs->z_znodes_lock);
1818 while (list_head(&zfsvfs->z_all_znodes) != NULL) {
1819 msleep(zfsvfs, &zfsvfs->z_znodes_lock, 0,
1822 mutex_exit(&zfsvfs->z_znodes_lock);
1827 * z_os will be NULL if there was an error in attempting to reopen
1828 * zfsvfs, so just return as the properties had already been
1829 * unregistered and cached data had been evicted before.
1831 if (zfsvfs->z_os == NULL)
1835 * Unregister properties.
1837 zfs_unregister_callbacks(zfsvfs);
1842 if (dmu_objset_is_dirty_anywhere(zfsvfs->z_os))
1843 if (!(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY))
1844 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
1845 (void) dmu_objset_evict_dbufs(zfsvfs->z_os);
1852 zfs_umount(vfs_t *vfsp, int fflag)
1854 kthread_t *td = curthread;
1855 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1857 cred_t *cr = td->td_ucred;
1860 ret = secpolicy_fs_unmount(cr, vfsp);
1862 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource),
1863 ZFS_DELEG_PERM_MOUNT, cr))
1868 * We purge the parent filesystem's vfsp as the parent filesystem
1869 * and all of its snapshots have their vnode's v_vfsp set to the
1870 * parent's filesystem's vfsp. Note, 'z_parent' is self
1871 * referential for non-snapshots.
1873 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1876 * Unmount any snapshots mounted under .zfs before unmounting the
1879 if (zfsvfs->z_ctldir != NULL) {
1880 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0)
1882 ret = vflush(vfsp, 0, 0, td);
1883 ASSERT(ret == EBUSY);
1884 if (!(fflag & MS_FORCE)) {
1885 if (zfsvfs->z_ctldir->v_count > 1)
1887 ASSERT(zfsvfs->z_ctldir->v_count == 1);
1889 zfsctl_destroy(zfsvfs);
1890 ASSERT(zfsvfs->z_ctldir == NULL);
1893 if (fflag & MS_FORCE) {
1895 * Mark file system as unmounted before calling
1896 * vflush(FORCECLOSE). This way we ensure no future vnops
1897 * will be called and risk operating on DOOMED vnodes.
1899 rrw_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1900 zfsvfs->z_unmounted = B_TRUE;
1901 rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
1905 * Flush all the files.
1907 ret = vflush(vfsp, 1, (fflag & MS_FORCE) ? FORCECLOSE : 0, td);
1909 if (!zfsvfs->z_issnap) {
1910 zfsctl_create(zfsvfs);
1911 ASSERT(zfsvfs->z_ctldir != NULL);
1916 if (!(fflag & MS_FORCE)) {
1918 * Check the number of active vnodes in the file system.
1919 * Our count is maintained in the vfs structure, but the
1920 * number is off by 1 to indicate a hold on the vfs
1923 * The '.zfs' directory maintains a reference of its
1924 * own, and any active references underneath are
1925 * reflected in the vnode count.
1927 if (zfsvfs->z_ctldir == NULL) {
1928 if (vfsp->vfs_count > 1)
1931 if (vfsp->vfs_count > 2 ||
1932 zfsvfs->z_ctldir->v_count > 1)
1937 vfsp->mnt_kern_flag |= MNTK_UNMOUNTF;
1941 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0);
1945 * z_os will be NULL if there was an error in
1946 * attempting to reopen zfsvfs.
1950 * Unset the objset user_ptr.
1952 mutex_enter(&os->os_user_ptr_lock);
1953 dmu_objset_set_user(os, NULL);
1954 mutex_exit(&os->os_user_ptr_lock);
1957 * Finally release the objset
1959 dmu_objset_disown(os, zfsvfs);
1963 * We can now safely destroy the '.zfs' directory node.
1965 if (zfsvfs->z_ctldir != NULL)
1966 zfsctl_destroy(zfsvfs);
1967 if (zfsvfs->z_issnap) {
1968 vnode_t *svp = vfsp->mnt_vnodecovered;
1970 if (svp->v_count >= 2)
1979 zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp)
1981 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1986 * zfs_zget() can't operate on virtual entries like .zfs/ or
1987 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP.
1988 * This will make NFS to switch to LOOKUP instead of using VGET.
1990 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR)
1991 return (EOPNOTSUPP);
1994 err = zfs_zget(zfsvfs, ino, &zp);
1995 if (err == 0 && zp->z_unlinked) {
2003 err = zfs_vnode_lock(*vpp, flags);
2010 zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
2011 struct ucred **credanonp, int *numsecflavors, int **secflavors)
2013 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2016 * If this is regular file system vfsp is the same as
2017 * zfsvfs->z_parent->z_vfs, but if it is snapshot,
2018 * zfsvfs->z_parent->z_vfs represents parent file system
2019 * which we have to use here, because only this file system
2020 * has mnt_export configured.
2022 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp,
2023 credanonp, numsecflavors, secflavors));
2026 CTASSERT(SHORT_FID_LEN <= sizeof(struct fid));
2027 CTASSERT(LONG_FID_LEN <= sizeof(struct fid));
2030 zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp)
2032 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2034 uint64_t object = 0;
2035 uint64_t fid_gen = 0;
2045 * On FreeBSD we can get snapshot's mount point or its parent file
2046 * system mount point depending if snapshot is already mounted or not.
2048 if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
2049 zfid_long_t *zlfid = (zfid_long_t *)fidp;
2050 uint64_t objsetid = 0;
2051 uint64_t setgen = 0;
2053 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
2054 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
2056 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
2057 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
2061 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
2067 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
2068 zfid_short_t *zfid = (zfid_short_t *)fidp;
2070 for (i = 0; i < sizeof (zfid->zf_object); i++)
2071 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
2073 for (i = 0; i < sizeof (zfid->zf_gen); i++)
2074 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
2080 /* A zero fid_gen means we are in the .zfs control directories */
2082 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) {
2083 *vpp = zfsvfs->z_ctldir;
2084 ASSERT(*vpp != NULL);
2085 if (object == ZFSCTL_INO_SNAPDIR) {
2086 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL,
2087 0, NULL, NULL, NULL, NULL, NULL) == 0);
2092 err = zfs_vnode_lock(*vpp, flags | LK_RETRY);
2098 gen_mask = -1ULL >> (64 - 8 * i);
2100 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
2101 if (err = zfs_zget(zfsvfs, object, &zp)) {
2105 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen,
2107 zp_gen = zp_gen & gen_mask;
2110 if (zp->z_unlinked || zp_gen != fid_gen) {
2111 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
2119 err = zfs_vnode_lock(*vpp, flags | LK_RETRY);
2121 vnode_create_vobject(*vpp, zp->z_size, curthread);
2128 * Block out VOPs and close zfsvfs_t::z_os
2130 * Note, if successful, then we return with the 'z_teardown_lock' and
2131 * 'z_teardown_inactive_lock' write held.
2134 zfs_suspend_fs(zfsvfs_t *zfsvfs)
2138 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
2140 dmu_objset_disown(zfsvfs->z_os, zfsvfs);
2146 * Reopen zfsvfs_t::z_os and release VOPs.
2149 zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname)
2153 ASSERT(RRW_WRITE_HELD(&zfsvfs->z_teardown_lock));
2154 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock));
2156 err = dmu_objset_own(osname, DMU_OST_ZFS, B_FALSE, zfsvfs,
2159 zfsvfs->z_os = NULL;
2162 uint64_t sa_obj = 0;
2165 * Make sure version hasn't changed
2168 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION,
2169 &zfsvfs->z_version);
2174 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ,
2175 ZFS_SA_ATTRS, 8, 1, &sa_obj);
2177 if (err && zfsvfs->z_version >= ZPL_VERSION_SA)
2180 if ((err = sa_setup(zfsvfs->z_os, sa_obj,
2181 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0)
2184 if (zfsvfs->z_version >= ZPL_VERSION_SA)
2185 sa_register_update_callback(zfsvfs->z_os,
2188 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0);
2190 zfs_set_fuid_feature(zfsvfs);
2193 * Attempt to re-establish all the active znodes with
2194 * their dbufs. If a zfs_rezget() fails, then we'll let
2195 * any potential callers discover that via ZFS_ENTER_VERIFY_VP
2196 * when they try to use their znode.
2198 mutex_enter(&zfsvfs->z_znodes_lock);
2199 for (zp = list_head(&zfsvfs->z_all_znodes); zp;
2200 zp = list_next(&zfsvfs->z_all_znodes, zp)) {
2201 (void) zfs_rezget(zp);
2203 mutex_exit(&zfsvfs->z_znodes_lock);
2207 /* release the VOPs */
2208 rw_exit(&zfsvfs->z_teardown_inactive_lock);
2209 rrw_exit(&zfsvfs->z_teardown_lock, FTAG);
2213 * Since we couldn't reopen zfsvfs::z_os, or
2214 * setup the sa framework force unmount this file system.
2216 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0)
2217 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread);
2223 zfs_freevfs(vfs_t *vfsp)
2225 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2229 * If this is a snapshot, we have an extra VFS_HOLD on our parent
2230 * from zfs_mount(). Release it here. If we came through
2231 * zfs_mountroot() instead, we didn't grab an extra hold, so
2232 * skip the VFS_RELE for rootvfs.
2234 if (zfsvfs->z_issnap && (vfsp != rootvfs))
2235 VFS_RELE(zfsvfs->z_parent->z_vfs);
2238 zfsvfs_free(zfsvfs);
2240 atomic_add_32(&zfs_active_fs_count, -1);
2244 static int desiredvnodes_backup;
2248 zfs_vnodes_adjust(void)
2251 int newdesiredvnodes;
2253 desiredvnodes_backup = desiredvnodes;
2256 * We calculate newdesiredvnodes the same way it is done in
2257 * vntblinit(). If it is equal to desiredvnodes, it means that
2258 * it wasn't tuned by the administrator and we can tune it down.
2260 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 *
2261 vm_kmem_size / (5 * (sizeof(struct vm_object) +
2262 sizeof(struct vnode))));
2263 if (newdesiredvnodes == desiredvnodes)
2264 desiredvnodes = (3 * newdesiredvnodes) / 4;
2269 zfs_vnodes_adjust_back(void)
2273 desiredvnodes = desiredvnodes_backup;
2281 printf("ZFS filesystem version " ZPL_VERSION_STRING "\n");
2284 * Initialize .zfs directory structures
2289 * Initialize znode cache, vnode ops, etc...
2294 * Reduce number of vnodes. Originally number of vnodes is calculated
2295 * with UFS inode in mind. We reduce it here, because it's too big for
2298 zfs_vnodes_adjust();
2300 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
2308 zfs_vnodes_adjust_back();
2314 return (zfs_active_fs_count != 0);
2318 zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers)
2321 objset_t *os = zfsvfs->z_os;
2324 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
2327 if (newvers < zfsvfs->z_version)
2330 if (zfs_spa_version_map(newvers) >
2331 spa_version(dmu_objset_spa(zfsvfs->z_os)))
2334 tx = dmu_tx_create(os);
2335 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
2336 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2337 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
2339 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
2341 error = dmu_tx_assign(tx, TXG_WAIT);
2347 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
2348 8, 1, &newvers, tx);
2355 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2358 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=,
2360 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
2361 DMU_OT_NONE, 0, tx);
2363 error = zap_add(os, MASTER_NODE_OBJ,
2364 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
2365 ASSERT3U(error, ==, 0);
2367 VERIFY(0 == sa_set_sa_object(os, sa_obj));
2368 sa_register_update_callback(os, zfs_sa_upgrade);
2371 spa_history_log_internal(LOG_DS_UPGRADE,
2372 dmu_objset_spa(os), tx, "oldver=%llu newver=%llu dataset = %llu",
2373 zfsvfs->z_version, newvers, dmu_objset_id(os));
2377 zfsvfs->z_version = newvers;
2379 zfs_set_fuid_feature(zfsvfs);
2385 * Read a property stored within the master node.
2388 zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
2394 * Look up the file system's value for the property. For the
2395 * version property, we look up a slightly different string.
2397 if (prop == ZFS_PROP_VERSION)
2398 pname = ZPL_VERSION_STR;
2400 pname = zfs_prop_to_name(prop);
2403 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value);
2405 if (error == ENOENT) {
2406 /* No value set, use the default value */
2408 case ZFS_PROP_VERSION:
2409 *value = ZPL_VERSION;
2411 case ZFS_PROP_NORMALIZE:
2412 case ZFS_PROP_UTF8ONLY:
2416 *value = ZFS_CASE_SENSITIVE;
2428 zfsvfs_update_fromname(const char *oldname, const char *newname)
2430 char tmpbuf[MAXPATHLEN];
2435 oldlen = strlen(oldname);
2437 mtx_lock(&mountlist_mtx);
2438 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
2439 fromname = mp->mnt_stat.f_mntfromname;
2440 if (strcmp(fromname, oldname) == 0) {
2441 (void)strlcpy(fromname, newname,
2442 sizeof(mp->mnt_stat.f_mntfromname));
2445 if (strncmp(fromname, oldname, oldlen) == 0 &&
2446 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) {
2447 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s",
2448 newname, fromname + oldlen);
2449 (void)strlcpy(fromname, tmpbuf,
2450 sizeof(mp->mnt_stat.f_mntfromname));
2454 mtx_unlock(&mountlist_mtx);