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.
25 * Copyright (c) 2012, 2015 by Delphix. All rights reserved.
26 * Copyright (c) 2014 Integros [integros.com]
27 * Copyright 2016 Nexenta Systems, Inc. All rights reserved.
30 /* Portions Copyright 2010 Robert Milkowski */
32 #include <sys/types.h>
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/sysmacros.h>
39 #include <sys/vnode.h>
41 #include <sys/mntent.h>
42 #include <sys/mount.h>
43 #include <sys/cmn_err.h>
44 #include <sys/zfs_znode.h>
45 #include <sys/zfs_dir.h>
47 #include <sys/fs/zfs.h>
49 #include <sys/dsl_prop.h>
50 #include <sys/dsl_dataset.h>
51 #include <sys/dsl_deleg.h>
55 #include <sys/sa_impl.h>
56 #include <sys/varargs.h>
57 #include <sys/policy.h>
58 #include <sys/atomic.h>
59 #include <sys/zfs_ioctl.h>
60 #include <sys/zfs_ctldir.h>
61 #include <sys/zfs_fuid.h>
62 #include <sys/sunddi.h>
64 #include <sys/dmu_objset.h>
65 #include <sys/spa_boot.h>
67 #include "zfs_comutil.h"
69 struct mtx zfs_debug_mtx;
70 MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF);
72 SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system");
75 SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0,
76 "File system owner can perform privileged operation on his file systems");
79 SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RWTUN, &zfs_debug_level, 0,
82 SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions");
83 static int zfs_version_acl = ZFS_ACL_VERSION;
84 SYSCTL_INT(_vfs_zfs_version, OID_AUTO, acl, CTLFLAG_RD, &zfs_version_acl, 0,
86 static int zfs_version_spa = SPA_VERSION;
87 SYSCTL_INT(_vfs_zfs_version, OID_AUTO, spa, CTLFLAG_RD, &zfs_version_spa, 0,
89 static int zfs_version_zpl = ZPL_VERSION;
90 SYSCTL_INT(_vfs_zfs_version, OID_AUTO, zpl, CTLFLAG_RD, &zfs_version_zpl, 0,
93 static int zfs_mount(vfs_t *vfsp);
94 static int zfs_umount(vfs_t *vfsp, int fflag);
95 static int zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp);
96 static int zfs_statfs(vfs_t *vfsp, struct statfs *statp);
97 static int zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp);
98 static int zfs_sync(vfs_t *vfsp, int waitfor);
99 static int zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
100 struct ucred **credanonp, int *numsecflavors, int **secflavors);
101 static int zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp);
102 static void zfs_objset_close(zfsvfs_t *zfsvfs);
103 static void zfs_freevfs(vfs_t *vfsp);
105 struct vfsops zfs_vfsops = {
106 .vfs_mount = zfs_mount,
107 .vfs_unmount = zfs_umount,
108 .vfs_root = zfs_root,
109 .vfs_statfs = zfs_statfs,
110 .vfs_vget = zfs_vget,
111 .vfs_sync = zfs_sync,
112 .vfs_checkexp = zfs_checkexp,
113 .vfs_fhtovp = zfs_fhtovp,
116 VFS_SET(zfs_vfsops, zfs, VFCF_JAIL | VFCF_DELEGADMIN);
119 * We need to keep a count of active fs's.
120 * This is necessary to prevent our module
121 * from being unloaded after a umount -f
123 static uint32_t zfs_active_fs_count = 0;
127 zfs_sync(vfs_t *vfsp, int waitfor)
131 * Data integrity is job one. We don't want a compromised kernel
132 * writing to the storage pool, so we never sync during panic.
138 * Ignore the system syncher. ZFS already commits async data
139 * at zfs_txg_timeout intervals.
141 if (waitfor == MNT_LAZY)
146 * Sync a specific filesystem.
148 zfsvfs_t *zfsvfs = vfsp->vfs_data;
152 error = vfs_stdsync(vfsp, waitfor);
157 dp = dmu_objset_pool(zfsvfs->z_os);
160 * If the system is shutting down, then skip any
161 * filesystems which may exist on a suspended pool.
163 if (sys_shutdown && spa_suspended(dp->dp_spa)) {
168 if (zfsvfs->z_log != NULL)
169 zil_commit(zfsvfs->z_log, 0);
174 * Sync all ZFS filesystems. This is what happens when you
175 * run sync(1M). Unlike other filesystems, ZFS honors the
176 * request by waiting for all pools to commit all dirty data.
184 #ifndef __FreeBSD_kernel__
186 zfs_create_unique_device(dev_t *dev)
191 ASSERT3U(zfs_minor, <=, MAXMIN32);
192 minor_t start = zfs_minor;
194 mutex_enter(&zfs_dev_mtx);
195 if (zfs_minor >= MAXMIN32) {
197 * If we're still using the real major
198 * keep out of /dev/zfs and /dev/zvol minor
199 * number space. If we're using a getudev()'ed
200 * major number, we can use all of its minors.
202 if (zfs_major == ddi_name_to_major(ZFS_DRIVER))
203 zfs_minor = ZFS_MIN_MINOR;
209 *dev = makedevice(zfs_major, zfs_minor);
210 mutex_exit(&zfs_dev_mtx);
211 } while (vfs_devismounted(*dev) && zfs_minor != start);
212 if (zfs_minor == start) {
214 * We are using all ~262,000 minor numbers for the
215 * current major number. Create a new major number.
217 if ((new_major = getudev()) == (major_t)-1) {
219 "zfs_mount: Can't get unique major "
223 mutex_enter(&zfs_dev_mtx);
224 zfs_major = new_major;
227 mutex_exit(&zfs_dev_mtx);
231 /* CONSTANTCONDITION */
236 #endif /* !__FreeBSD_kernel__ */
239 atime_changed_cb(void *arg, uint64_t newval)
241 zfsvfs_t *zfsvfs = arg;
243 if (newval == TRUE) {
244 zfsvfs->z_atime = TRUE;
245 zfsvfs->z_vfs->vfs_flag &= ~MNT_NOATIME;
246 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME);
247 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_ATIME, NULL, 0);
249 zfsvfs->z_atime = FALSE;
250 zfsvfs->z_vfs->vfs_flag |= MNT_NOATIME;
251 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_ATIME);
252 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOATIME, NULL, 0);
257 xattr_changed_cb(void *arg, uint64_t newval)
259 zfsvfs_t *zfsvfs = arg;
261 if (newval == TRUE) {
262 /* XXX locking on vfs_flag? */
264 zfsvfs->z_vfs->vfs_flag |= VFS_XATTR;
266 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR);
267 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_XATTR, NULL, 0);
269 /* XXX locking on vfs_flag? */
271 zfsvfs->z_vfs->vfs_flag &= ~VFS_XATTR;
273 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_XATTR);
274 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOXATTR, NULL, 0);
279 blksz_changed_cb(void *arg, uint64_t newval)
281 zfsvfs_t *zfsvfs = arg;
282 ASSERT3U(newval, <=, spa_maxblocksize(dmu_objset_spa(zfsvfs->z_os)));
283 ASSERT3U(newval, >=, SPA_MINBLOCKSIZE);
284 ASSERT(ISP2(newval));
286 zfsvfs->z_max_blksz = newval;
287 zfsvfs->z_vfs->mnt_stat.f_iosize = newval;
291 readonly_changed_cb(void *arg, uint64_t newval)
293 zfsvfs_t *zfsvfs = arg;
296 /* XXX locking on vfs_flag? */
297 zfsvfs->z_vfs->vfs_flag |= VFS_RDONLY;
298 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RW);
299 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RO, NULL, 0);
301 /* XXX locking on vfs_flag? */
302 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
303 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_RO);
304 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_RW, NULL, 0);
309 setuid_changed_cb(void *arg, uint64_t newval)
311 zfsvfs_t *zfsvfs = arg;
313 if (newval == FALSE) {
314 zfsvfs->z_vfs->vfs_flag |= VFS_NOSETUID;
315 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_SETUID);
316 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID, NULL, 0);
318 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOSETUID;
319 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOSETUID);
320 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_SETUID, NULL, 0);
325 exec_changed_cb(void *arg, uint64_t newval)
327 zfsvfs_t *zfsvfs = arg;
329 if (newval == FALSE) {
330 zfsvfs->z_vfs->vfs_flag |= VFS_NOEXEC;
331 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_EXEC);
332 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC, NULL, 0);
334 zfsvfs->z_vfs->vfs_flag &= ~VFS_NOEXEC;
335 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NOEXEC);
336 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_EXEC, NULL, 0);
341 * The nbmand mount option can be changed at mount time.
342 * We can't allow it to be toggled on live file systems or incorrect
343 * behavior may be seen from cifs clients
345 * This property isn't registered via dsl_prop_register(), but this callback
346 * will be called when a file system is first mounted
349 nbmand_changed_cb(void *arg, uint64_t newval)
351 zfsvfs_t *zfsvfs = arg;
352 if (newval == FALSE) {
353 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND);
354 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND, NULL, 0);
356 vfs_clearmntopt(zfsvfs->z_vfs, MNTOPT_NONBMAND);
357 vfs_setmntopt(zfsvfs->z_vfs, MNTOPT_NBMAND, NULL, 0);
362 snapdir_changed_cb(void *arg, uint64_t newval)
364 zfsvfs_t *zfsvfs = arg;
366 zfsvfs->z_show_ctldir = newval;
370 vscan_changed_cb(void *arg, uint64_t newval)
372 zfsvfs_t *zfsvfs = arg;
374 zfsvfs->z_vscan = newval;
378 acl_mode_changed_cb(void *arg, uint64_t newval)
380 zfsvfs_t *zfsvfs = arg;
382 zfsvfs->z_acl_mode = newval;
386 acl_inherit_changed_cb(void *arg, uint64_t newval)
388 zfsvfs_t *zfsvfs = arg;
390 zfsvfs->z_acl_inherit = newval;
394 zfs_register_callbacks(vfs_t *vfsp)
396 struct dsl_dataset *ds = NULL;
398 zfsvfs_t *zfsvfs = NULL;
400 boolean_t readonly = B_FALSE;
401 boolean_t do_readonly = B_FALSE;
402 boolean_t setuid = B_FALSE;
403 boolean_t do_setuid = B_FALSE;
404 boolean_t exec = B_FALSE;
405 boolean_t do_exec = B_FALSE;
407 boolean_t devices = B_FALSE;
408 boolean_t do_devices = B_FALSE;
410 boolean_t xattr = B_FALSE;
411 boolean_t do_xattr = B_FALSE;
412 boolean_t atime = B_FALSE;
413 boolean_t do_atime = B_FALSE;
417 zfsvfs = vfsp->vfs_data;
422 * This function can be called for a snapshot when we update snapshot's
423 * mount point, which isn't really supported.
425 if (dmu_objset_is_snapshot(os))
429 * The act of registering our callbacks will destroy any mount
430 * options we may have. In order to enable temporary overrides
431 * of mount options, we stash away the current values and
432 * restore them after we register the callbacks.
434 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL) ||
435 !spa_writeable(dmu_objset_spa(os))) {
437 do_readonly = B_TRUE;
438 } else if (vfs_optionisset(vfsp, MNTOPT_RW, NULL)) {
440 do_readonly = B_TRUE;
442 if (vfs_optionisset(vfsp, MNTOPT_NOSUID, NULL)) {
446 if (vfs_optionisset(vfsp, MNTOPT_NOSETUID, NULL)) {
449 } else if (vfs_optionisset(vfsp, MNTOPT_SETUID, NULL)) {
454 if (vfs_optionisset(vfsp, MNTOPT_NOEXEC, NULL)) {
457 } else if (vfs_optionisset(vfsp, MNTOPT_EXEC, NULL)) {
461 if (vfs_optionisset(vfsp, MNTOPT_NOXATTR, NULL)) {
464 } else if (vfs_optionisset(vfsp, MNTOPT_XATTR, NULL)) {
468 if (vfs_optionisset(vfsp, MNTOPT_NOATIME, NULL)) {
471 } else if (vfs_optionisset(vfsp, MNTOPT_ATIME, NULL)) {
477 * We need to enter pool configuration here, so that we can use
478 * dsl_prop_get_int_ds() to handle the special nbmand property below.
479 * dsl_prop_get_integer() can not be used, because it has to acquire
480 * spa_namespace_lock and we can not do that because we already hold
481 * z_teardown_lock. The problem is that spa_write_cachefile() is called
482 * with spa_namespace_lock held and the function calls ZFS vnode
483 * operations to write the cache file and thus z_teardown_lock is
484 * acquired after spa_namespace_lock.
486 ds = dmu_objset_ds(os);
487 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
490 * nbmand is a special property. It can only be changed at
493 * This is weird, but it is documented to only be changeable
496 if (vfs_optionisset(vfsp, MNTOPT_NONBMAND, NULL)) {
498 } else if (vfs_optionisset(vfsp, MNTOPT_NBMAND, NULL)) {
500 } else if (error = dsl_prop_get_int_ds(ds, "nbmand", &nbmand) != 0) {
501 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
506 * Register property callbacks.
508 * It would probably be fine to just check for i/o error from
509 * the first prop_register(), but I guess I like to go
512 error = dsl_prop_register(ds,
513 zfs_prop_to_name(ZFS_PROP_ATIME), atime_changed_cb, zfsvfs);
514 error = error ? error : dsl_prop_register(ds,
515 zfs_prop_to_name(ZFS_PROP_XATTR), xattr_changed_cb, zfsvfs);
516 error = error ? error : dsl_prop_register(ds,
517 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), blksz_changed_cb, zfsvfs);
518 error = error ? error : dsl_prop_register(ds,
519 zfs_prop_to_name(ZFS_PROP_READONLY), readonly_changed_cb, zfsvfs);
521 error = error ? error : dsl_prop_register(ds,
522 zfs_prop_to_name(ZFS_PROP_DEVICES), devices_changed_cb, zfsvfs);
524 error = error ? error : dsl_prop_register(ds,
525 zfs_prop_to_name(ZFS_PROP_SETUID), setuid_changed_cb, zfsvfs);
526 error = error ? error : dsl_prop_register(ds,
527 zfs_prop_to_name(ZFS_PROP_EXEC), exec_changed_cb, zfsvfs);
528 error = error ? error : dsl_prop_register(ds,
529 zfs_prop_to_name(ZFS_PROP_SNAPDIR), snapdir_changed_cb, zfsvfs);
530 error = error ? error : dsl_prop_register(ds,
531 zfs_prop_to_name(ZFS_PROP_ACLMODE), acl_mode_changed_cb, zfsvfs);
532 error = error ? error : dsl_prop_register(ds,
533 zfs_prop_to_name(ZFS_PROP_ACLINHERIT), acl_inherit_changed_cb,
535 error = error ? error : dsl_prop_register(ds,
536 zfs_prop_to_name(ZFS_PROP_VSCAN), vscan_changed_cb, zfsvfs);
537 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
542 * Invoke our callbacks to restore temporary mount options.
545 readonly_changed_cb(zfsvfs, readonly);
547 setuid_changed_cb(zfsvfs, setuid);
549 exec_changed_cb(zfsvfs, exec);
551 xattr_changed_cb(zfsvfs, xattr);
553 atime_changed_cb(zfsvfs, atime);
555 nbmand_changed_cb(zfsvfs, nbmand);
560 dsl_prop_unregister_all(ds, zfsvfs);
565 zfs_space_delta_cb(dmu_object_type_t bonustype, void *data,
566 uint64_t *userp, uint64_t *groupp)
569 * Is it a valid type of object to track?
571 if (bonustype != DMU_OT_ZNODE && bonustype != DMU_OT_SA)
572 return (SET_ERROR(ENOENT));
575 * If we have a NULL data pointer
576 * then assume the id's aren't changing and
577 * return EEXIST to the dmu to let it know to
581 return (SET_ERROR(EEXIST));
583 if (bonustype == DMU_OT_ZNODE) {
584 znode_phys_t *znp = data;
585 *userp = znp->zp_uid;
586 *groupp = znp->zp_gid;
589 sa_hdr_phys_t *sap = data;
590 sa_hdr_phys_t sa = *sap;
591 boolean_t swap = B_FALSE;
593 ASSERT(bonustype == DMU_OT_SA);
595 if (sa.sa_magic == 0) {
597 * This should only happen for newly created
598 * files that haven't had the znode data filled
605 if (sa.sa_magic == BSWAP_32(SA_MAGIC)) {
606 sa.sa_magic = SA_MAGIC;
607 sa.sa_layout_info = BSWAP_16(sa.sa_layout_info);
610 VERIFY3U(sa.sa_magic, ==, SA_MAGIC);
613 hdrsize = sa_hdrsize(&sa);
614 VERIFY3U(hdrsize, >=, sizeof (sa_hdr_phys_t));
615 *userp = *((uint64_t *)((uintptr_t)data + hdrsize +
617 *groupp = *((uint64_t *)((uintptr_t)data + hdrsize +
620 *userp = BSWAP_64(*userp);
621 *groupp = BSWAP_64(*groupp);
628 fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr,
629 char *domainbuf, int buflen, uid_t *ridp)
634 fuid = zfs_strtonum(fuidstr, NULL);
636 domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid));
638 (void) strlcpy(domainbuf, domain, buflen);
641 *ridp = FUID_RID(fuid);
645 zfs_userquota_prop_to_obj(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type)
648 case ZFS_PROP_USERUSED:
649 return (DMU_USERUSED_OBJECT);
650 case ZFS_PROP_GROUPUSED:
651 return (DMU_GROUPUSED_OBJECT);
652 case ZFS_PROP_USERQUOTA:
653 return (zfsvfs->z_userquota_obj);
654 case ZFS_PROP_GROUPQUOTA:
655 return (zfsvfs->z_groupquota_obj);
661 zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
662 uint64_t *cookiep, void *vbuf, uint64_t *bufsizep)
667 zfs_useracct_t *buf = vbuf;
670 if (!dmu_objset_userspace_present(zfsvfs->z_os))
671 return (SET_ERROR(ENOTSUP));
673 obj = zfs_userquota_prop_to_obj(zfsvfs, type);
679 for (zap_cursor_init_serialized(&zc, zfsvfs->z_os, obj, *cookiep);
680 (error = zap_cursor_retrieve(&zc, &za)) == 0;
681 zap_cursor_advance(&zc)) {
682 if ((uintptr_t)buf - (uintptr_t)vbuf + sizeof (zfs_useracct_t) >
686 fuidstr_to_sid(zfsvfs, za.za_name,
687 buf->zu_domain, sizeof (buf->zu_domain), &buf->zu_rid);
689 buf->zu_space = za.za_first_integer;
695 ASSERT3U((uintptr_t)buf - (uintptr_t)vbuf, <=, *bufsizep);
696 *bufsizep = (uintptr_t)buf - (uintptr_t)vbuf;
697 *cookiep = zap_cursor_serialize(&zc);
698 zap_cursor_fini(&zc);
703 * buf must be big enough (eg, 32 bytes)
706 id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid,
707 char *buf, boolean_t addok)
712 if (domain && domain[0]) {
713 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok);
715 return (SET_ERROR(ENOENT));
717 fuid = FUID_ENCODE(domainid, rid);
718 (void) sprintf(buf, "%llx", (longlong_t)fuid);
723 zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
724 const char *domain, uint64_t rid, uint64_t *valp)
732 if (!dmu_objset_userspace_present(zfsvfs->z_os))
733 return (SET_ERROR(ENOTSUP));
735 obj = zfs_userquota_prop_to_obj(zfsvfs, type);
739 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_FALSE);
743 err = zap_lookup(zfsvfs->z_os, obj, buf, 8, 1, valp);
750 zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
751 const char *domain, uint64_t rid, uint64_t quota)
757 boolean_t fuid_dirtied;
759 if (type != ZFS_PROP_USERQUOTA && type != ZFS_PROP_GROUPQUOTA)
760 return (SET_ERROR(EINVAL));
762 if (zfsvfs->z_version < ZPL_VERSION_USERSPACE)
763 return (SET_ERROR(ENOTSUP));
765 objp = (type == ZFS_PROP_USERQUOTA) ? &zfsvfs->z_userquota_obj :
766 &zfsvfs->z_groupquota_obj;
768 err = id_to_fuidstr(zfsvfs, domain, rid, buf, B_TRUE);
771 fuid_dirtied = zfsvfs->z_fuid_dirty;
773 tx = dmu_tx_create(zfsvfs->z_os);
774 dmu_tx_hold_zap(tx, *objp ? *objp : DMU_NEW_OBJECT, B_TRUE, NULL);
776 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
777 zfs_userquota_prop_prefixes[type]);
780 zfs_fuid_txhold(zfsvfs, tx);
781 err = dmu_tx_assign(tx, TXG_WAIT);
787 mutex_enter(&zfsvfs->z_lock);
789 *objp = zap_create(zfsvfs->z_os, DMU_OT_USERGROUP_QUOTA,
791 VERIFY(0 == zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
792 zfs_userquota_prop_prefixes[type], 8, 1, objp, tx));
794 mutex_exit(&zfsvfs->z_lock);
797 err = zap_remove(zfsvfs->z_os, *objp, buf, tx);
801 err = zap_update(zfsvfs->z_os, *objp, buf, 8, 1, "a, tx);
805 zfs_fuid_sync(zfsvfs, tx);
811 zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup, uint64_t fuid)
814 uint64_t used, quota, usedobj, quotaobj;
817 usedobj = isgroup ? DMU_GROUPUSED_OBJECT : DMU_USERUSED_OBJECT;
818 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
820 if (quotaobj == 0 || zfsvfs->z_replay)
823 (void) sprintf(buf, "%llx", (longlong_t)fuid);
824 err = zap_lookup(zfsvfs->z_os, quotaobj, buf, 8, 1, "a);
828 err = zap_lookup(zfsvfs->z_os, usedobj, buf, 8, 1, &used);
831 return (used >= quota);
835 zfs_owner_overquota(zfsvfs_t *zfsvfs, znode_t *zp, boolean_t isgroup)
840 quotaobj = isgroup ? zfsvfs->z_groupquota_obj : zfsvfs->z_userquota_obj;
842 fuid = isgroup ? zp->z_gid : zp->z_uid;
844 if (quotaobj == 0 || zfsvfs->z_replay)
847 return (zfs_fuid_overquota(zfsvfs, isgroup, fuid));
851 * Associate this zfsvfs with the given objset, which must be owned.
852 * This will cache a bunch of on-disk state from the objset in the
856 zfsvfs_init(zfsvfs_t *zfsvfs, objset_t *os)
861 zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE;
862 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
865 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version);
868 if (zfsvfs->z_version >
869 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
870 (void) printf("Can't mount a version %lld file system "
871 "on a version %lld pool\n. Pool must be upgraded to mount "
872 "this file system.", (u_longlong_t)zfsvfs->z_version,
873 (u_longlong_t)spa_version(dmu_objset_spa(os)));
874 return (SET_ERROR(ENOTSUP));
876 error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &val);
879 zfsvfs->z_norm = (int)val;
881 error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &val);
884 zfsvfs->z_utf8 = (val != 0);
886 error = zfs_get_zplprop(os, ZFS_PROP_CASE, &val);
889 zfsvfs->z_case = (uint_t)val;
892 * Fold case on file systems that are always or sometimes case
895 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
896 zfsvfs->z_case == ZFS_CASE_MIXED)
897 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
899 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
900 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
903 if (zfsvfs->z_use_sa) {
904 /* should either have both of these objects or none */
905 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1,
911 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
912 &zfsvfs->z_attr_table);
916 if (zfsvfs->z_version >= ZPL_VERSION_SA)
917 sa_register_update_callback(os, zfs_sa_upgrade);
919 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
923 ASSERT(zfsvfs->z_root != 0);
925 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
926 &zfsvfs->z_unlinkedobj);
930 error = zap_lookup(os, MASTER_NODE_OBJ,
931 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
932 8, 1, &zfsvfs->z_userquota_obj);
934 zfsvfs->z_userquota_obj = 0;
938 error = zap_lookup(os, MASTER_NODE_OBJ,
939 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
940 8, 1, &zfsvfs->z_groupquota_obj);
942 zfsvfs->z_groupquota_obj = 0;
946 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
947 &zfsvfs->z_fuid_obj);
949 zfsvfs->z_fuid_obj = 0;
953 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
954 &zfsvfs->z_shares_dir);
956 zfsvfs->z_shares_dir = 0;
961 * Only use the name cache if we are looking for a
962 * name on a file system that does not require normalization
963 * or case folding. We can also look there if we happen to be
964 * on a non-normalizing, mixed sensitivity file system IF we
965 * are looking for the exact name (which is always the case on
968 zfsvfs->z_use_namecache = !zfsvfs->z_norm ||
969 ((zfsvfs->z_case == ZFS_CASE_MIXED) &&
970 !(zfsvfs->z_norm & ~U8_TEXTPREP_TOUPPER));
975 #if defined(__FreeBSD__)
977 zfsvfs_task_unlinked_drain(void *context, int pending __unused)
980 zfs_unlinked_drain((zfsvfs_t *)context);
985 zfsvfs_create(const char *osname, zfsvfs_t **zfvp)
992 * XXX: Fix struct statfs so this isn't necessary!
994 * The 'osname' is used as the filesystem's special node, which means
995 * it must fit in statfs.f_mntfromname, or else it can't be
996 * enumerated, so libzfs_mnttab_find() returns NULL, which causes
997 * 'zfs unmount' to think it's not mounted when it is.
999 if (strlen(osname) >= MNAMELEN)
1000 return (SET_ERROR(ENAMETOOLONG));
1002 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
1005 * We claim to always be readonly so we can open snapshots;
1006 * other ZPL code will prevent us from writing to snapshots.
1009 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os);
1011 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1015 error = zfsvfs_create_impl(zfvp, zfsvfs, os);
1017 dmu_objset_disown(os, zfsvfs);
1024 zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os)
1028 zfsvfs->z_vfs = NULL;
1029 zfsvfs->z_parent = zfsvfs;
1031 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1032 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL);
1033 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
1034 offsetof(znode_t, z_link_node));
1035 #if defined(__FreeBSD__)
1036 TASK_INIT(&zfsvfs->z_unlinked_drain_task, 0,
1037 zfsvfs_task_unlinked_drain, zfsvfs);
1040 rrm_init(&zfsvfs->z_teardown_lock, B_TRUE);
1042 rrm_init(&zfsvfs->z_teardown_lock, B_FALSE);
1044 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
1045 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
1046 for (int i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1047 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
1049 error = zfsvfs_init(zfsvfs, os);
1052 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1061 zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
1065 error = zfs_register_callbacks(zfsvfs->z_vfs);
1069 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
1072 * If we are not mounting (ie: online recv), then we don't
1073 * have to worry about replaying the log as we blocked all
1074 * operations out since we closed the ZIL.
1080 * During replay we remove the read only flag to
1081 * allow replays to succeed.
1083 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY;
1085 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
1087 zfs_unlinked_drain(zfsvfs);
1090 * Parse and replay the intent log.
1092 * Because of ziltest, this must be done after
1093 * zfs_unlinked_drain(). (Further note: ziltest
1094 * doesn't use readonly mounts, where
1095 * zfs_unlinked_drain() isn't called.) This is because
1096 * ziltest causes spa_sync() to think it's committed,
1097 * but actually it is not, so the intent log contains
1098 * many txg's worth of changes.
1100 * In particular, if object N is in the unlinked set in
1101 * the last txg to actually sync, then it could be
1102 * actually freed in a later txg and then reallocated
1103 * in a yet later txg. This would write a "create
1104 * object N" record to the intent log. Normally, this
1105 * would be fine because the spa_sync() would have
1106 * written out the fact that object N is free, before
1107 * we could write the "create object N" intent log
1110 * But when we are in ziltest mode, we advance the "open
1111 * txg" without actually spa_sync()-ing the changes to
1112 * disk. So we would see that object N is still
1113 * allocated and in the unlinked set, and there is an
1114 * intent log record saying to allocate it.
1116 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) {
1117 if (zil_replay_disable) {
1118 zil_destroy(zfsvfs->z_log, B_FALSE);
1120 zfsvfs->z_replay = B_TRUE;
1121 zil_replay(zfsvfs->z_os, zfsvfs,
1123 zfsvfs->z_replay = B_FALSE;
1126 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */
1130 * Set the objset user_ptr to track its zfsvfs.
1132 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
1133 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
1134 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
1139 extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */
1142 zfsvfs_free(zfsvfs_t *zfsvfs)
1147 * This is a barrier to prevent the filesystem from going away in
1148 * zfs_znode_move() until we can safely ensure that the filesystem is
1149 * not unmounted. We consider the filesystem valid before the barrier
1150 * and invalid after the barrier.
1152 rw_enter(&zfsvfs_lock, RW_READER);
1153 rw_exit(&zfsvfs_lock);
1155 zfs_fuid_destroy(zfsvfs);
1157 mutex_destroy(&zfsvfs->z_znodes_lock);
1158 mutex_destroy(&zfsvfs->z_lock);
1159 list_destroy(&zfsvfs->z_all_znodes);
1160 rrm_destroy(&zfsvfs->z_teardown_lock);
1161 rw_destroy(&zfsvfs->z_teardown_inactive_lock);
1162 rw_destroy(&zfsvfs->z_fuid_lock);
1163 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1164 mutex_destroy(&zfsvfs->z_hold_mtx[i]);
1165 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1169 zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
1171 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
1172 if (zfsvfs->z_vfs) {
1173 if (zfsvfs->z_use_fuids) {
1174 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
1175 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
1176 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
1177 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
1178 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
1179 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
1181 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
1182 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
1183 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
1184 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
1185 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
1186 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
1189 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
1193 zfs_domount(vfs_t *vfsp, char *osname)
1195 uint64_t recordsize, fsid_guid;
1203 error = zfsvfs_create(osname, &zfsvfs);
1206 zfsvfs->z_vfs = vfsp;
1209 /* Initialize the generic filesystem structure. */
1210 vfsp->vfs_bcount = 0;
1211 vfsp->vfs_data = NULL;
1213 if (zfs_create_unique_device(&mount_dev) == -1) {
1214 error = SET_ERROR(ENODEV);
1217 ASSERT(vfs_devismounted(mount_dev) == 0);
1220 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize,
1223 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE;
1224 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize;
1226 vfsp->vfs_data = zfsvfs;
1227 vfsp->mnt_flag |= MNT_LOCAL;
1228 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
1229 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES;
1230 vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED;
1231 vfsp->mnt_kern_flag |= MNTK_NO_IOPF; /* vn_io_fault can be used */
1234 * The fsid is 64 bits, composed of an 8-bit fs type, which
1235 * separates our fsid from any other filesystem types, and a
1236 * 56-bit objset unique ID. The objset unique ID is unique to
1237 * all objsets open on this system, provided by unique_create().
1238 * The 8-bit fs type must be put in the low bits of fsid[1]
1239 * because that's where other Solaris filesystems put it.
1241 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os);
1242 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
1243 vfsp->vfs_fsid.val[0] = fsid_guid;
1244 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
1245 vfsp->mnt_vfc->vfc_typenum & 0xFF;
1248 * Set features for file system.
1250 zfs_set_fuid_feature(zfsvfs);
1251 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
1252 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1253 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1254 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE);
1255 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) {
1256 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1257 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1259 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED);
1261 if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
1264 atime_changed_cb(zfsvfs, B_FALSE);
1265 readonly_changed_cb(zfsvfs, B_TRUE);
1266 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL))
1268 xattr_changed_cb(zfsvfs, pval);
1269 zfsvfs->z_issnap = B_TRUE;
1270 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED;
1272 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
1273 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
1274 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
1276 error = zfsvfs_setup(zfsvfs, B_TRUE);
1279 vfs_mountedfrom(vfsp, osname);
1281 if (!zfsvfs->z_issnap)
1282 zfsctl_create(zfsvfs);
1285 dmu_objset_disown(zfsvfs->z_os, zfsvfs);
1286 zfsvfs_free(zfsvfs);
1288 atomic_inc_32(&zfs_active_fs_count);
1295 zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
1297 objset_t *os = zfsvfs->z_os;
1299 if (!dmu_objset_is_snapshot(os))
1300 dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs);
1305 * Convert a decimal digit string to a uint64_t integer.
1308 str_to_uint64(char *str, uint64_t *objnum)
1313 if (*str < '0' || *str > '9')
1314 return (SET_ERROR(EINVAL));
1316 num = num*10 + *str++ - '0';
1324 * The boot path passed from the boot loader is in the form of
1325 * "rootpool-name/root-filesystem-object-number'. Convert this
1326 * string to a dataset name: "rootpool-name/root-filesystem-name".
1329 zfs_parse_bootfs(char *bpath, char *outpath)
1335 if (*bpath == 0 || *bpath == '/')
1336 return (SET_ERROR(EINVAL));
1338 (void) strcpy(outpath, bpath);
1340 slashp = strchr(bpath, '/');
1342 /* if no '/', just return the pool name */
1343 if (slashp == NULL) {
1347 /* if not a number, just return the root dataset name */
1348 if (str_to_uint64(slashp+1, &objnum)) {
1353 error = dsl_dsobj_to_dsname(bpath, objnum, outpath);
1360 * Check that the hex label string is appropriate for the dataset being
1361 * mounted into the global_zone proper.
1363 * Return an error if the hex label string is not default or
1364 * admin_low/admin_high. For admin_low labels, the corresponding
1365 * dataset must be readonly.
1368 zfs_check_global_label(const char *dsname, const char *hexsl)
1370 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1372 if (strcasecmp(hexsl, ADMIN_HIGH) == 0)
1374 if (strcasecmp(hexsl, ADMIN_LOW) == 0) {
1375 /* must be readonly */
1378 if (dsl_prop_get_integer(dsname,
1379 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL))
1380 return (SET_ERROR(EACCES));
1381 return (rdonly ? 0 : EACCES);
1383 return (SET_ERROR(EACCES));
1387 * Determine whether the mount is allowed according to MAC check.
1388 * by comparing (where appropriate) label of the dataset against
1389 * the label of the zone being mounted into. If the dataset has
1390 * no label, create one.
1392 * Returns 0 if access allowed, error otherwise (e.g. EACCES)
1395 zfs_mount_label_policy(vfs_t *vfsp, char *osname)
1398 zone_t *mntzone = NULL;
1399 ts_label_t *mnt_tsl;
1402 char ds_hexsl[MAXNAMELEN];
1404 retv = EACCES; /* assume the worst */
1407 * Start by getting the dataset label if it exists.
1409 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1410 1, sizeof (ds_hexsl), &ds_hexsl, NULL);
1412 return (SET_ERROR(EACCES));
1415 * If labeling is NOT enabled, then disallow the mount of datasets
1416 * which have a non-default label already. No other label checks
1419 if (!is_system_labeled()) {
1420 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1422 return (SET_ERROR(EACCES));
1426 * Get the label of the mountpoint. If mounting into the global
1427 * zone (i.e. mountpoint is not within an active zone and the
1428 * zoned property is off), the label must be default or
1429 * admin_low/admin_high only; no other checks are needed.
1431 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE);
1432 if (mntzone->zone_id == GLOBAL_ZONEID) {
1437 if (dsl_prop_get_integer(osname,
1438 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL))
1439 return (SET_ERROR(EACCES));
1441 return (zfs_check_global_label(osname, ds_hexsl));
1444 * This is the case of a zone dataset being mounted
1445 * initially, before the zone has been fully created;
1446 * allow this mount into global zone.
1451 mnt_tsl = mntzone->zone_slabel;
1452 ASSERT(mnt_tsl != NULL);
1453 label_hold(mnt_tsl);
1454 mnt_sl = label2bslabel(mnt_tsl);
1456 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) {
1458 * The dataset doesn't have a real label, so fabricate one.
1462 if (l_to_str_internal(mnt_sl, &str) == 0 &&
1463 dsl_prop_set_string(osname,
1464 zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1465 ZPROP_SRC_LOCAL, str) == 0)
1468 kmem_free(str, strlen(str) + 1);
1469 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) {
1471 * Now compare labels to complete the MAC check. If the
1472 * labels are equal then allow access. If the mountpoint
1473 * label dominates the dataset label, allow readonly access.
1474 * Otherwise, access is denied.
1476 if (blequal(mnt_sl, &ds_sl))
1478 else if (bldominates(mnt_sl, &ds_sl)) {
1479 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0);
1484 label_rele(mnt_tsl);
1488 #endif /* SECLABEL */
1490 #ifdef OPENSOLARIS_MOUNTROOT
1492 zfs_mountroot(vfs_t *vfsp, enum whymountroot why)
1495 static int zfsrootdone = 0;
1496 zfsvfs_t *zfsvfs = NULL;
1505 * The filesystem that we mount as root is defined in the
1506 * boot property "zfs-bootfs" with a format of
1507 * "poolname/root-dataset-objnum".
1509 if (why == ROOT_INIT) {
1511 return (SET_ERROR(EBUSY));
1513 * the process of doing a spa_load will require the
1514 * clock to be set before we could (for example) do
1515 * something better by looking at the timestamp on
1516 * an uberblock, so just set it to -1.
1520 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) {
1521 cmn_err(CE_NOTE, "spa_get_bootfs: can not get "
1523 return (SET_ERROR(EINVAL));
1525 zfs_devid = spa_get_bootprop("diskdevid");
1526 error = spa_import_rootpool(rootfs.bo_name, zfs_devid);
1528 spa_free_bootprop(zfs_devid);
1530 spa_free_bootprop(zfs_bootfs);
1531 cmn_err(CE_NOTE, "spa_import_rootpool: error %d",
1535 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) {
1536 spa_free_bootprop(zfs_bootfs);
1537 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d",
1542 spa_free_bootprop(zfs_bootfs);
1544 if (error = vfs_lock(vfsp))
1547 if (error = zfs_domount(vfsp, rootfs.bo_name)) {
1548 cmn_err(CE_NOTE, "zfs_domount: error %d", error);
1552 zfsvfs = (zfsvfs_t *)vfsp->vfs_data;
1554 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) {
1555 cmn_err(CE_NOTE, "zfs_zget: error %d", error);
1560 mutex_enter(&vp->v_lock);
1561 vp->v_flag |= VROOT;
1562 mutex_exit(&vp->v_lock);
1566 * Leave rootvp held. The root file system is never unmounted.
1569 vfs_add((struct vnode *)0, vfsp,
1570 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0);
1574 } else if (why == ROOT_REMOUNT) {
1575 readonly_changed_cb(vfsp->vfs_data, B_FALSE);
1576 vfsp->vfs_flag |= VFS_REMOUNT;
1578 /* refresh mount options */
1579 zfs_unregister_callbacks(vfsp->vfs_data);
1580 return (zfs_register_callbacks(vfsp));
1582 } else if (why == ROOT_UNMOUNT) {
1583 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data);
1584 (void) zfs_sync(vfsp, 0, 0);
1589 * if "why" is equal to anything else other than ROOT_INIT,
1590 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it.
1592 return (SET_ERROR(ENOTSUP));
1594 #endif /* OPENSOLARIS_MOUNTROOT */
1597 getpoolname(const char *osname, char *poolname)
1601 p = strchr(osname, '/');
1603 if (strlen(osname) >= MAXNAMELEN)
1604 return (ENAMETOOLONG);
1605 (void) strcpy(poolname, osname);
1607 if (p - osname >= MAXNAMELEN)
1608 return (ENAMETOOLONG);
1609 (void) strncpy(poolname, osname, p - osname);
1610 poolname[p - osname] = '\0';
1617 zfs_mount(vfs_t *vfsp)
1619 kthread_t *td = curthread;
1620 vnode_t *mvp = vfsp->mnt_vnodecovered;
1621 cred_t *cr = td->td_ucred;
1627 if (mvp->v_type != VDIR)
1628 return (SET_ERROR(ENOTDIR));
1630 mutex_enter(&mvp->v_lock);
1631 if ((uap->flags & MS_REMOUNT) == 0 &&
1632 (uap->flags & MS_OVERLAY) == 0 &&
1633 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
1634 mutex_exit(&mvp->v_lock);
1635 return (SET_ERROR(EBUSY));
1637 mutex_exit(&mvp->v_lock);
1640 * ZFS does not support passing unparsed data in via MS_DATA.
1641 * Users should use the MS_OPTIONSTR interface; this means
1642 * that all option parsing is already done and the options struct
1643 * can be interrogated.
1645 if ((uap->flags & MS_DATA) && uap->datalen > 0)
1646 return (SET_ERROR(EINVAL));
1649 * Get the objset name (the "special" mount argument).
1651 if (error = pn_get(uap->spec, fromspace, &spn))
1654 osname = spn.pn_path;
1655 #else /* !illumos */
1656 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
1657 return (SET_ERROR(EINVAL));
1660 * If full-owner-access is enabled and delegated administration is
1661 * turned on, we must set nosuid.
1663 if (zfs_super_owner &&
1664 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) {
1665 secpolicy_fs_mount_clearopts(cr, vfsp);
1667 #endif /* illumos */
1670 * Check for mount privilege?
1672 * If we don't have privilege then see if
1673 * we have local permission to allow it
1675 error = secpolicy_fs_mount(cr, mvp, vfsp);
1677 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0)
1680 if (!(vfsp->vfs_flag & MS_REMOUNT)) {
1684 * Make sure user is the owner of the mount point
1685 * or has sufficient privileges.
1688 vattr.va_mask = AT_UID;
1690 vn_lock(mvp, LK_SHARED | LK_RETRY);
1691 if (VOP_GETATTR(mvp, &vattr, cr)) {
1696 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
1697 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) {
1704 secpolicy_fs_mount_clearopts(cr, vfsp);
1708 * Refuse to mount a filesystem if we are in a local zone and the
1709 * dataset is not visible.
1711 if (!INGLOBALZONE(curthread) &&
1712 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) {
1713 error = SET_ERROR(EPERM);
1718 error = zfs_mount_label_policy(vfsp, osname);
1723 vfsp->vfs_flag |= MNT_NFS4ACLS;
1726 * When doing a remount, we simply refresh our temporary properties
1727 * according to those options set in the current VFS options.
1729 if (vfsp->vfs_flag & MS_REMOUNT) {
1730 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1733 * Refresh mount options with z_teardown_lock blocking I/O while
1734 * the filesystem is in an inconsistent state.
1735 * The lock also serializes this code with filesystem
1736 * manipulations between entry to zfs_suspend_fs() and return
1737 * from zfs_resume_fs().
1739 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1740 zfs_unregister_callbacks(zfsvfs);
1741 error = zfs_register_callbacks(vfsp);
1742 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
1746 /* Initial root mount: try hard to import the requested root pool. */
1747 if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 &&
1748 (vfsp->vfs_flag & MNT_UPDATE) == 0) {
1749 char pname[MAXNAMELEN];
1751 error = getpoolname(osname, pname);
1753 error = spa_import_rootpool(pname);
1758 error = zfs_domount(vfsp, osname);
1763 * Add an extra VFS_HOLD on our parent vfs so that it can't
1764 * disappear due to a forced unmount.
1766 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap)
1767 VFS_HOLD(mvp->v_vfsp);
1775 zfs_statfs(vfs_t *vfsp, struct statfs *statp)
1777 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1778 uint64_t refdbytes, availbytes, usedobjs, availobjs;
1780 statp->f_version = STATFS_VERSION;
1784 dmu_objset_space(zfsvfs->z_os,
1785 &refdbytes, &availbytes, &usedobjs, &availobjs);
1788 * The underlying storage pool actually uses multiple block sizes.
1789 * We report the fragsize as the smallest block size we support,
1790 * and we report our blocksize as the filesystem's maximum blocksize.
1792 statp->f_bsize = SPA_MINBLOCKSIZE;
1793 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize;
1796 * The following report "total" blocks of various kinds in the
1797 * file system, but reported in terms of f_frsize - the
1801 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT;
1802 statp->f_bfree = availbytes / statp->f_bsize;
1803 statp->f_bavail = statp->f_bfree; /* no root reservation */
1806 * statvfs() should really be called statufs(), because it assumes
1807 * static metadata. ZFS doesn't preallocate files, so the best
1808 * we can do is report the max that could possibly fit in f_files,
1809 * and that minus the number actually used in f_ffree.
1810 * For f_ffree, report the smaller of the number of object available
1811 * and the number of blocks (each object will take at least a block).
1813 statp->f_ffree = MIN(availobjs, statp->f_bfree);
1814 statp->f_files = statp->f_ffree + usedobjs;
1817 * We're a zfs filesystem.
1819 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename));
1821 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname,
1822 sizeof(statp->f_mntfromname));
1823 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname,
1824 sizeof(statp->f_mntonname));
1826 statp->f_namemax = MAXNAMELEN - 1;
1833 zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp)
1835 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1841 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp);
1843 *vpp = ZTOV(rootzp);
1848 error = vn_lock(*vpp, flags);
1858 * Teardown the zfsvfs::z_os.
1860 * Note, if 'unmounting' is FALSE, we return with the 'z_teardown_lock'
1861 * and 'z_teardown_inactive_lock' held.
1864 zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
1868 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1872 * We purge the parent filesystem's vfsp as the parent
1873 * filesystem and all of its snapshots have their vnode's
1874 * v_vfsp set to the parent's filesystem's vfsp. Note,
1875 * 'z_parent' is self referential for non-snapshots.
1877 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1878 #ifdef FREEBSD_NAMECACHE
1879 cache_purgevfs(zfsvfs->z_parent->z_vfs, true);
1884 * Close the zil. NB: Can't close the zil while zfs_inactive
1885 * threads are blocked as zil_close can call zfs_inactive.
1887 if (zfsvfs->z_log) {
1888 zil_close(zfsvfs->z_log);
1889 zfsvfs->z_log = NULL;
1892 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER);
1895 * If we are not unmounting (ie: online recv) and someone already
1896 * unmounted this file system while we were doing the switcheroo,
1897 * or a reopen of z_os failed then just bail out now.
1899 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) {
1900 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1901 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
1902 return (SET_ERROR(EIO));
1906 * At this point there are no vops active, and any new vops will
1907 * fail with EIO since we have z_teardown_lock for writer (only
1908 * relavent for forced unmount).
1910 * Release all holds on dbufs.
1912 mutex_enter(&zfsvfs->z_znodes_lock);
1913 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL;
1914 zp = list_next(&zfsvfs->z_all_znodes, zp))
1916 ASSERT(ZTOV(zp)->v_count >= 0);
1917 zfs_znode_dmu_fini(zp);
1919 mutex_exit(&zfsvfs->z_znodes_lock);
1922 * If we are unmounting, set the unmounted flag and let new vops
1923 * unblock. zfs_inactive will have the unmounted behavior, and all
1924 * other vops will fail with EIO.
1927 zfsvfs->z_unmounted = B_TRUE;
1928 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1929 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
1933 * z_os will be NULL if there was an error in attempting to reopen
1934 * zfsvfs, so just return as the properties had already been
1935 * unregistered and cached data had been evicted before.
1937 if (zfsvfs->z_os == NULL)
1941 * Unregister properties.
1943 zfs_unregister_callbacks(zfsvfs);
1948 if (dsl_dataset_is_dirty(dmu_objset_ds(zfsvfs->z_os)) &&
1949 !(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY))
1950 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
1951 dmu_objset_evict_dbufs(zfsvfs->z_os);
1958 zfs_umount(vfs_t *vfsp, int fflag)
1960 kthread_t *td = curthread;
1961 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1963 cred_t *cr = td->td_ucred;
1966 ret = secpolicy_fs_unmount(cr, vfsp);
1968 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource),
1969 ZFS_DELEG_PERM_MOUNT, cr))
1974 * We purge the parent filesystem's vfsp as the parent filesystem
1975 * and all of its snapshots have their vnode's v_vfsp set to the
1976 * parent's filesystem's vfsp. Note, 'z_parent' is self
1977 * referential for non-snapshots.
1979 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1982 * Unmount any snapshots mounted under .zfs before unmounting the
1985 if (zfsvfs->z_ctldir != NULL) {
1986 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0)
1990 if (fflag & MS_FORCE) {
1992 * Mark file system as unmounted before calling
1993 * vflush(FORCECLOSE). This way we ensure no future vnops
1994 * will be called and risk operating on DOOMED vnodes.
1996 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1997 zfsvfs->z_unmounted = B_TRUE;
1998 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
2002 * Flush all the files.
2004 ret = vflush(vfsp, 0, (fflag & MS_FORCE) ? FORCECLOSE : 0, td);
2009 if (!(fflag & MS_FORCE)) {
2011 * Check the number of active vnodes in the file system.
2012 * Our count is maintained in the vfs structure, but the
2013 * number is off by 1 to indicate a hold on the vfs
2016 * The '.zfs' directory maintains a reference of its
2017 * own, and any active references underneath are
2018 * reflected in the vnode count.
2020 if (zfsvfs->z_ctldir == NULL) {
2021 if (vfsp->vfs_count > 1)
2022 return (SET_ERROR(EBUSY));
2024 if (vfsp->vfs_count > 2 ||
2025 zfsvfs->z_ctldir->v_count > 1)
2026 return (SET_ERROR(EBUSY));
2031 while (taskqueue_cancel(system_taskq->tq_queue,
2032 &zfsvfs->z_unlinked_drain_task, NULL) != 0)
2033 taskqueue_drain(system_taskq->tq_queue,
2034 &zfsvfs->z_unlinked_drain_task);
2036 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0);
2040 * z_os will be NULL if there was an error in
2041 * attempting to reopen zfsvfs.
2045 * Unset the objset user_ptr.
2047 mutex_enter(&os->os_user_ptr_lock);
2048 dmu_objset_set_user(os, NULL);
2049 mutex_exit(&os->os_user_ptr_lock);
2052 * Finally release the objset
2054 dmu_objset_disown(os, zfsvfs);
2058 * We can now safely destroy the '.zfs' directory node.
2060 if (zfsvfs->z_ctldir != NULL)
2061 zfsctl_destroy(zfsvfs);
2068 zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp)
2070 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2075 * zfs_zget() can't operate on virtual entries like .zfs/ or
2076 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP.
2077 * This will make NFS to switch to LOOKUP instead of using VGET.
2079 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR ||
2080 (zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir))
2081 return (EOPNOTSUPP);
2084 err = zfs_zget(zfsvfs, ino, &zp);
2085 if (err == 0 && zp->z_unlinked) {
2093 err = vn_lock(*vpp, flags);
2100 zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
2101 struct ucred **credanonp, int *numsecflavors, int **secflavors)
2103 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2106 * If this is regular file system vfsp is the same as
2107 * zfsvfs->z_parent->z_vfs, but if it is snapshot,
2108 * zfsvfs->z_parent->z_vfs represents parent file system
2109 * which we have to use here, because only this file system
2110 * has mnt_export configured.
2112 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp,
2113 credanonp, numsecflavors, secflavors));
2116 CTASSERT(SHORT_FID_LEN <= sizeof(struct fid));
2117 CTASSERT(LONG_FID_LEN <= sizeof(struct fid));
2120 zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp)
2122 struct componentname cn;
2123 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2126 uint64_t object = 0;
2127 uint64_t fid_gen = 0;
2137 * On FreeBSD we can get snapshot's mount point or its parent file
2138 * system mount point depending if snapshot is already mounted or not.
2140 if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
2141 zfid_long_t *zlfid = (zfid_long_t *)fidp;
2142 uint64_t objsetid = 0;
2143 uint64_t setgen = 0;
2145 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
2146 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
2148 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
2149 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
2153 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
2155 return (SET_ERROR(EINVAL));
2159 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
2160 zfid_short_t *zfid = (zfid_short_t *)fidp;
2162 for (i = 0; i < sizeof (zfid->zf_object); i++)
2163 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
2165 for (i = 0; i < sizeof (zfid->zf_gen); i++)
2166 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
2169 return (SET_ERROR(EINVAL));
2173 * A zero fid_gen means we are in .zfs or the .zfs/snapshot
2174 * directory tree. If the object == zfsvfs->z_shares_dir, then
2175 * we are in the .zfs/shares directory tree.
2177 if ((fid_gen == 0 &&
2178 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) ||
2179 (zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) {
2181 VERIFY0(zfsctl_root(zfsvfs, LK_SHARED, &dvp));
2182 if (object == ZFSCTL_INO_SNAPDIR) {
2183 cn.cn_nameptr = "snapshot";
2184 cn.cn_namelen = strlen(cn.cn_nameptr);
2185 cn.cn_nameiop = LOOKUP;
2186 cn.cn_flags = ISLASTCN | LOCKLEAF;
2187 cn.cn_lkflags = flags;
2188 VERIFY0(VOP_LOOKUP(dvp, vpp, &cn));
2190 } else if (object == zfsvfs->z_shares_dir) {
2192 * XXX This branch must not be taken,
2193 * if it is, then the lookup below will
2196 cn.cn_nameptr = "shares";
2197 cn.cn_namelen = strlen(cn.cn_nameptr);
2198 cn.cn_nameiop = LOOKUP;
2199 cn.cn_flags = ISLASTCN;
2200 cn.cn_lkflags = flags;
2201 VERIFY0(VOP_LOOKUP(dvp, vpp, &cn));
2209 gen_mask = -1ULL >> (64 - 8 * i);
2211 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
2212 if (err = zfs_zget(zfsvfs, object, &zp)) {
2216 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen,
2218 zp_gen = zp_gen & gen_mask;
2221 if (zp->z_unlinked || zp_gen != fid_gen) {
2222 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
2225 return (SET_ERROR(EINVAL));
2230 err = vn_lock(*vpp, flags);
2232 vnode_create_vobject(*vpp, zp->z_size, curthread);
2239 * Block out VOPs and close zfsvfs_t::z_os
2241 * Note, if successful, then we return with the 'z_teardown_lock' and
2242 * 'z_teardown_inactive_lock' write held. We leave ownership of the underlying
2243 * dataset and objset intact so that they can be atomically handed off during
2244 * a subsequent rollback or recv operation and the resume thereafter.
2247 zfs_suspend_fs(zfsvfs_t *zfsvfs)
2251 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
2258 * Rebuild SA and release VOPs. Note that ownership of the underlying dataset
2259 * is an invariant across any of the operations that can be performed while the
2260 * filesystem was suspended. Whether it succeeded or failed, the preconditions
2261 * are the same: the relevant objset and associated dataset are owned by
2262 * zfsvfs, held, and long held on entry.
2265 zfs_resume_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds)
2270 ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock));
2271 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock));
2274 * We already own this, so just update the objset_t, as the one we
2275 * had before may have been evicted.
2278 VERIFY3P(ds->ds_owner, ==, zfsvfs);
2279 VERIFY(dsl_dataset_long_held(ds));
2280 VERIFY0(dmu_objset_from_ds(ds, &os));
2282 err = zfsvfs_init(zfsvfs, os);
2286 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0);
2288 zfs_set_fuid_feature(zfsvfs);
2291 * Attempt to re-establish all the active znodes with
2292 * their dbufs. If a zfs_rezget() fails, then we'll let
2293 * any potential callers discover that via ZFS_ENTER_VERIFY_VP
2294 * when they try to use their znode.
2296 mutex_enter(&zfsvfs->z_znodes_lock);
2297 for (zp = list_head(&zfsvfs->z_all_znodes); zp;
2298 zp = list_next(&zfsvfs->z_all_znodes, zp)) {
2299 (void) zfs_rezget(zp);
2301 mutex_exit(&zfsvfs->z_znodes_lock);
2304 /* release the VOPs */
2305 rw_exit(&zfsvfs->z_teardown_inactive_lock);
2306 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
2310 * Since we couldn't setup the sa framework, try to force
2311 * unmount this file system.
2313 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) {
2314 vfs_ref(zfsvfs->z_vfs);
2315 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread);
2322 zfs_freevfs(vfs_t *vfsp)
2324 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2328 * If this is a snapshot, we have an extra VFS_HOLD on our parent
2329 * from zfs_mount(). Release it here. If we came through
2330 * zfs_mountroot() instead, we didn't grab an extra hold, so
2331 * skip the VFS_RELE for rootvfs.
2333 if (zfsvfs->z_issnap && (vfsp != rootvfs))
2334 VFS_RELE(zfsvfs->z_parent->z_vfs);
2337 zfsvfs_free(zfsvfs);
2339 atomic_dec_32(&zfs_active_fs_count);
2343 static int desiredvnodes_backup;
2347 zfs_vnodes_adjust(void)
2350 int newdesiredvnodes;
2352 desiredvnodes_backup = desiredvnodes;
2355 * We calculate newdesiredvnodes the same way it is done in
2356 * vntblinit(). If it is equal to desiredvnodes, it means that
2357 * it wasn't tuned by the administrator and we can tune it down.
2359 newdesiredvnodes = min(maxproc + vm_cnt.v_page_count / 4, 2 *
2360 vm_kmem_size / (5 * (sizeof(struct vm_object) +
2361 sizeof(struct vnode))));
2362 if (newdesiredvnodes == desiredvnodes)
2363 desiredvnodes = (3 * newdesiredvnodes) / 4;
2368 zfs_vnodes_adjust_back(void)
2372 desiredvnodes = desiredvnodes_backup;
2380 printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n");
2383 * Initialize .zfs directory structures
2388 * Initialize znode cache, vnode ops, etc...
2393 * Reduce number of vnodes. Originally number of vnodes is calculated
2394 * with UFS inode in mind. We reduce it here, because it's too big for
2397 zfs_vnodes_adjust();
2399 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
2407 zfs_vnodes_adjust_back();
2413 return (zfs_active_fs_count != 0);
2417 zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers)
2420 objset_t *os = zfsvfs->z_os;
2423 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
2424 return (SET_ERROR(EINVAL));
2426 if (newvers < zfsvfs->z_version)
2427 return (SET_ERROR(EINVAL));
2429 if (zfs_spa_version_map(newvers) >
2430 spa_version(dmu_objset_spa(zfsvfs->z_os)))
2431 return (SET_ERROR(ENOTSUP));
2433 tx = dmu_tx_create(os);
2434 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
2435 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2436 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
2438 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
2440 error = dmu_tx_assign(tx, TXG_WAIT);
2446 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
2447 8, 1, &newvers, tx);
2454 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2457 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=,
2459 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
2460 DMU_OT_NONE, 0, tx);
2462 error = zap_add(os, MASTER_NODE_OBJ,
2463 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
2466 VERIFY(0 == sa_set_sa_object(os, sa_obj));
2467 sa_register_update_callback(os, zfs_sa_upgrade);
2470 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx,
2471 "from %llu to %llu", zfsvfs->z_version, newvers);
2475 zfsvfs->z_version = newvers;
2477 zfs_set_fuid_feature(zfsvfs);
2483 * Read a property stored within the master node.
2486 zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
2492 * Look up the file system's value for the property. For the
2493 * version property, we look up a slightly different string.
2495 if (prop == ZFS_PROP_VERSION)
2496 pname = ZPL_VERSION_STR;
2498 pname = zfs_prop_to_name(prop);
2501 ASSERT3U(os->os_phys->os_type, ==, DMU_OST_ZFS);
2502 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value);
2505 if (error == ENOENT) {
2506 /* No value set, use the default value */
2508 case ZFS_PROP_VERSION:
2509 *value = ZPL_VERSION;
2511 case ZFS_PROP_NORMALIZE:
2512 case ZFS_PROP_UTF8ONLY:
2516 *value = ZFS_CASE_SENSITIVE;
2527 * Return true if the coresponding vfs's unmounted flag is set.
2528 * Otherwise return false.
2529 * If this function returns true we know VFS unmount has been initiated.
2532 zfs_get_vfs_flag_unmounted(objset_t *os)
2535 boolean_t unmounted = B_FALSE;
2537 ASSERT(dmu_objset_type(os) == DMU_OST_ZFS);
2539 mutex_enter(&os->os_user_ptr_lock);
2540 zfvp = dmu_objset_get_user(os);
2541 if (zfvp != NULL && zfvp->z_vfs != NULL &&
2542 (zfvp->z_vfs->mnt_kern_flag & MNTK_UNMOUNT))
2544 mutex_exit(&os->os_user_ptr_lock);
2551 zfsvfs_update_fromname(const char *oldname, const char *newname)
2553 char tmpbuf[MAXPATHLEN];
2558 oldlen = strlen(oldname);
2560 mtx_lock(&mountlist_mtx);
2561 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
2562 fromname = mp->mnt_stat.f_mntfromname;
2563 if (strcmp(fromname, oldname) == 0) {
2564 (void)strlcpy(fromname, newname,
2565 sizeof(mp->mnt_stat.f_mntfromname));
2568 if (strncmp(fromname, oldname, oldlen) == 0 &&
2569 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) {
2570 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s",
2571 newname, fromname + oldlen);
2572 (void)strlcpy(fromname, tmpbuf,
2573 sizeof(mp->mnt_stat.f_mntfromname));
2577 mtx_unlock(&mountlist_mtx);