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, 2014 by Delphix. All rights reserved.
26 * Copyright (c) 2014 Integros [integros.com]
29 /* Portions Copyright 2010 Robert Milkowski */
31 #include <sys/types.h>
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/sysmacros.h>
38 #include <sys/vnode.h>
40 #include <sys/mntent.h>
41 #include <sys/mount.h>
42 #include <sys/cmn_err.h>
43 #include <sys/zfs_znode.h>
44 #include <sys/zfs_dir.h>
46 #include <sys/fs/zfs.h>
48 #include <sys/dsl_prop.h>
49 #include <sys/dsl_dataset.h>
50 #include <sys/dsl_deleg.h>
54 #include <sys/sa_impl.h>
55 #include <sys/varargs.h>
56 #include <sys/policy.h>
57 #include <sys/atomic.h>
58 #include <sys/zfs_ioctl.h>
59 #include <sys/zfs_ctldir.h>
60 #include <sys/zfs_fuid.h>
61 #include <sys/sunddi.h>
63 #include <sys/dmu_objset.h>
64 #include <sys/spa_boot.h>
66 #include "zfs_comutil.h"
68 struct mtx zfs_debug_mtx;
69 MTX_SYSINIT(zfs_debug_mtx, &zfs_debug_mtx, "zfs_debug", MTX_DEF);
71 SYSCTL_NODE(_vfs, OID_AUTO, zfs, CTLFLAG_RW, 0, "ZFS file system");
74 SYSCTL_INT(_vfs_zfs, OID_AUTO, super_owner, CTLFLAG_RW, &zfs_super_owner, 0,
75 "File system owner can perform privileged operation on his file systems");
78 TUNABLE_INT("vfs.zfs.debug", &zfs_debug_level);
79 SYSCTL_INT(_vfs_zfs, OID_AUTO, debug, CTLFLAG_RW, &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 static 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_config_sync() 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 = 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 zfsvfs_create(const char *osname, zfsvfs_t **zfvp)
860 * XXX: Fix struct statfs so this isn't necessary!
862 * The 'osname' is used as the filesystem's special node, which means
863 * it must fit in statfs.f_mntfromname, or else it can't be
864 * enumerated, so libzfs_mnttab_find() returns NULL, which causes
865 * 'zfs unmount' to think it's not mounted when it is.
867 if (strlen(osname) >= MNAMELEN)
868 return (SET_ERROR(ENAMETOOLONG));
870 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
873 * We claim to always be readonly so we can open snapshots;
874 * other ZPL code will prevent us from writing to snapshots.
876 error = dmu_objset_own(osname, DMU_OST_ZFS, B_TRUE, zfsvfs, &os);
878 kmem_free(zfsvfs, sizeof (zfsvfs_t));
883 * Initialize the zfs-specific filesystem structure.
884 * Should probably make this a kmem cache, shuffle fields,
885 * and just bzero up to z_hold_mtx[].
887 zfsvfs->z_vfs = NULL;
888 zfsvfs->z_parent = zfsvfs;
889 zfsvfs->z_max_blksz = SPA_OLD_MAXBLOCKSIZE;
890 zfsvfs->z_show_ctldir = ZFS_SNAPDIR_VISIBLE;
893 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version);
896 } else if (zfsvfs->z_version >
897 zfs_zpl_version_map(spa_version(dmu_objset_spa(os)))) {
898 (void) printf("Can't mount a version %lld file system "
899 "on a version %lld pool\n. Pool must be upgraded to mount "
900 "this file system.", (u_longlong_t)zfsvfs->z_version,
901 (u_longlong_t)spa_version(dmu_objset_spa(os)));
902 error = SET_ERROR(ENOTSUP);
905 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0)
907 zfsvfs->z_norm = (int)zval;
909 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0)
911 zfsvfs->z_utf8 = (zval != 0);
913 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0)
915 zfsvfs->z_case = (uint_t)zval;
918 * Fold case on file systems that are always or sometimes case
921 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
922 zfsvfs->z_case == ZFS_CASE_MIXED)
923 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
925 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
926 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
928 if (zfsvfs->z_use_sa) {
929 /* should either have both of these objects or none */
930 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1,
936 * Pre SA versions file systems should never touch
937 * either the attribute registration or layout objects.
942 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
943 &zfsvfs->z_attr_table);
947 if (zfsvfs->z_version >= ZPL_VERSION_SA)
948 sa_register_update_callback(os, zfs_sa_upgrade);
950 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
954 ASSERT(zfsvfs->z_root != 0);
956 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
957 &zfsvfs->z_unlinkedobj);
961 error = zap_lookup(os, MASTER_NODE_OBJ,
962 zfs_userquota_prop_prefixes[ZFS_PROP_USERQUOTA],
963 8, 1, &zfsvfs->z_userquota_obj);
964 if (error && error != ENOENT)
967 error = zap_lookup(os, MASTER_NODE_OBJ,
968 zfs_userquota_prop_prefixes[ZFS_PROP_GROUPQUOTA],
969 8, 1, &zfsvfs->z_groupquota_obj);
970 if (error && error != ENOENT)
973 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
974 &zfsvfs->z_fuid_obj);
975 if (error && error != ENOENT)
978 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_SHARES_DIR, 8, 1,
979 &zfsvfs->z_shares_dir);
980 if (error && error != ENOENT)
983 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
984 mutex_init(&zfsvfs->z_lock, NULL, MUTEX_DEFAULT, NULL);
985 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
986 offsetof(znode_t, z_link_node));
987 rrm_init(&zfsvfs->z_teardown_lock, B_FALSE);
988 rw_init(&zfsvfs->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL);
989 rw_init(&zfsvfs->z_fuid_lock, NULL, RW_DEFAULT, NULL);
990 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
991 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
997 dmu_objset_disown(os, zfsvfs);
999 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1004 zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
1008 error = zfs_register_callbacks(zfsvfs->z_vfs);
1013 * Set the objset user_ptr to track its zfsvfs.
1015 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
1016 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
1017 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
1019 zfsvfs->z_log = zil_open(zfsvfs->z_os, zfs_get_data);
1022 * If we are not mounting (ie: online recv), then we don't
1023 * have to worry about replaying the log as we blocked all
1024 * operations out since we closed the ZIL.
1030 * During replay we remove the read only flag to
1031 * allow replays to succeed.
1033 readonly = zfsvfs->z_vfs->vfs_flag & VFS_RDONLY;
1035 zfsvfs->z_vfs->vfs_flag &= ~VFS_RDONLY;
1037 zfs_unlinked_drain(zfsvfs);
1040 * Parse and replay the intent log.
1042 * Because of ziltest, this must be done after
1043 * zfs_unlinked_drain(). (Further note: ziltest
1044 * doesn't use readonly mounts, where
1045 * zfs_unlinked_drain() isn't called.) This is because
1046 * ziltest causes spa_sync() to think it's committed,
1047 * but actually it is not, so the intent log contains
1048 * many txg's worth of changes.
1050 * In particular, if object N is in the unlinked set in
1051 * the last txg to actually sync, then it could be
1052 * actually freed in a later txg and then reallocated
1053 * in a yet later txg. This would write a "create
1054 * object N" record to the intent log. Normally, this
1055 * would be fine because the spa_sync() would have
1056 * written out the fact that object N is free, before
1057 * we could write the "create object N" intent log
1060 * But when we are in ziltest mode, we advance the "open
1061 * txg" without actually spa_sync()-ing the changes to
1062 * disk. So we would see that object N is still
1063 * allocated and in the unlinked set, and there is an
1064 * intent log record saying to allocate it.
1066 if (spa_writeable(dmu_objset_spa(zfsvfs->z_os))) {
1067 if (zil_replay_disable) {
1068 zil_destroy(zfsvfs->z_log, B_FALSE);
1070 zfsvfs->z_replay = B_TRUE;
1071 zil_replay(zfsvfs->z_os, zfsvfs,
1073 zfsvfs->z_replay = B_FALSE;
1076 zfsvfs->z_vfs->vfs_flag |= readonly; /* restore readonly bit */
1082 extern krwlock_t zfsvfs_lock; /* in zfs_znode.c */
1085 zfsvfs_free(zfsvfs_t *zfsvfs)
1090 * This is a barrier to prevent the filesystem from going away in
1091 * zfs_znode_move() until we can safely ensure that the filesystem is
1092 * not unmounted. We consider the filesystem valid before the barrier
1093 * and invalid after the barrier.
1095 rw_enter(&zfsvfs_lock, RW_READER);
1096 rw_exit(&zfsvfs_lock);
1098 zfs_fuid_destroy(zfsvfs);
1100 mutex_destroy(&zfsvfs->z_znodes_lock);
1101 mutex_destroy(&zfsvfs->z_lock);
1102 list_destroy(&zfsvfs->z_all_znodes);
1103 rrm_destroy(&zfsvfs->z_teardown_lock);
1104 rw_destroy(&zfsvfs->z_teardown_inactive_lock);
1105 rw_destroy(&zfsvfs->z_fuid_lock);
1106 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
1107 mutex_destroy(&zfsvfs->z_hold_mtx[i]);
1108 kmem_free(zfsvfs, sizeof (zfsvfs_t));
1112 zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
1114 zfsvfs->z_use_fuids = USE_FUIDS(zfsvfs->z_version, zfsvfs->z_os);
1115 if (zfsvfs->z_vfs) {
1116 if (zfsvfs->z_use_fuids) {
1117 vfs_set_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
1118 vfs_set_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
1119 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
1120 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
1121 vfs_set_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
1122 vfs_set_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
1124 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_XVATTR);
1125 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_SYSATTR_VIEWS);
1126 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACEMASKONACCESS);
1127 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACLONCREATE);
1128 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_ACCESS_FILTER);
1129 vfs_clear_feature(zfsvfs->z_vfs, VFSFT_REPARSE);
1132 zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
1136 zfs_domount(vfs_t *vfsp, char *osname)
1138 uint64_t recordsize, fsid_guid;
1146 error = zfsvfs_create(osname, &zfsvfs);
1149 zfsvfs->z_vfs = vfsp;
1152 /* Initialize the generic filesystem structure. */
1153 vfsp->vfs_bcount = 0;
1154 vfsp->vfs_data = NULL;
1156 if (zfs_create_unique_device(&mount_dev) == -1) {
1157 error = SET_ERROR(ENODEV);
1160 ASSERT(vfs_devismounted(mount_dev) == 0);
1163 if (error = dsl_prop_get_integer(osname, "recordsize", &recordsize,
1166 zfsvfs->z_vfs->vfs_bsize = SPA_MINBLOCKSIZE;
1167 zfsvfs->z_vfs->mnt_stat.f_iosize = recordsize;
1169 vfsp->vfs_data = zfsvfs;
1170 vfsp->mnt_flag |= MNT_LOCAL;
1171 vfsp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
1172 vfsp->mnt_kern_flag |= MNTK_SHARED_WRITES;
1173 vfsp->mnt_kern_flag |= MNTK_EXTENDED_SHARED;
1176 * The fsid is 64 bits, composed of an 8-bit fs type, which
1177 * separates our fsid from any other filesystem types, and a
1178 * 56-bit objset unique ID. The objset unique ID is unique to
1179 * all objsets open on this system, provided by unique_create().
1180 * The 8-bit fs type must be put in the low bits of fsid[1]
1181 * because that's where other Solaris filesystems put it.
1183 fsid_guid = dmu_objset_fsid_guid(zfsvfs->z_os);
1184 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
1185 vfsp->vfs_fsid.val[0] = fsid_guid;
1186 vfsp->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
1187 vfsp->mnt_vfc->vfc_typenum & 0xFF;
1190 * Set features for file system.
1192 zfs_set_fuid_feature(zfsvfs);
1193 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE) {
1194 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1195 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1196 vfs_set_feature(vfsp, VFSFT_NOCASESENSITIVE);
1197 } else if (zfsvfs->z_case == ZFS_CASE_MIXED) {
1198 vfs_set_feature(vfsp, VFSFT_DIRENTFLAGS);
1199 vfs_set_feature(vfsp, VFSFT_CASEINSENSITIVE);
1201 vfs_set_feature(vfsp, VFSFT_ZEROCOPY_SUPPORTED);
1203 if (dmu_objset_is_snapshot(zfsvfs->z_os)) {
1206 atime_changed_cb(zfsvfs, B_FALSE);
1207 readonly_changed_cb(zfsvfs, B_TRUE);
1208 if (error = dsl_prop_get_integer(osname, "xattr", &pval, NULL))
1210 xattr_changed_cb(zfsvfs, pval);
1211 zfsvfs->z_issnap = B_TRUE;
1212 zfsvfs->z_os->os_sync = ZFS_SYNC_DISABLED;
1214 mutex_enter(&zfsvfs->z_os->os_user_ptr_lock);
1215 dmu_objset_set_user(zfsvfs->z_os, zfsvfs);
1216 mutex_exit(&zfsvfs->z_os->os_user_ptr_lock);
1218 error = zfsvfs_setup(zfsvfs, B_TRUE);
1221 vfs_mountedfrom(vfsp, osname);
1223 if (!zfsvfs->z_issnap)
1224 zfsctl_create(zfsvfs);
1227 dmu_objset_disown(zfsvfs->z_os, zfsvfs);
1228 zfsvfs_free(zfsvfs);
1230 atomic_inc_32(&zfs_active_fs_count);
1237 zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
1239 objset_t *os = zfsvfs->z_os;
1241 if (!dmu_objset_is_snapshot(os))
1242 dsl_prop_unregister_all(dmu_objset_ds(os), zfsvfs);
1247 * Convert a decimal digit string to a uint64_t integer.
1250 str_to_uint64(char *str, uint64_t *objnum)
1255 if (*str < '0' || *str > '9')
1256 return (SET_ERROR(EINVAL));
1258 num = num*10 + *str++ - '0';
1266 * The boot path passed from the boot loader is in the form of
1267 * "rootpool-name/root-filesystem-object-number'. Convert this
1268 * string to a dataset name: "rootpool-name/root-filesystem-name".
1271 zfs_parse_bootfs(char *bpath, char *outpath)
1277 if (*bpath == 0 || *bpath == '/')
1278 return (SET_ERROR(EINVAL));
1280 (void) strcpy(outpath, bpath);
1282 slashp = strchr(bpath, '/');
1284 /* if no '/', just return the pool name */
1285 if (slashp == NULL) {
1289 /* if not a number, just return the root dataset name */
1290 if (str_to_uint64(slashp+1, &objnum)) {
1295 error = dsl_dsobj_to_dsname(bpath, objnum, outpath);
1302 * Check that the hex label string is appropriate for the dataset being
1303 * mounted into the global_zone proper.
1305 * Return an error if the hex label string is not default or
1306 * admin_low/admin_high. For admin_low labels, the corresponding
1307 * dataset must be readonly.
1310 zfs_check_global_label(const char *dsname, const char *hexsl)
1312 if (strcasecmp(hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1314 if (strcasecmp(hexsl, ADMIN_HIGH) == 0)
1316 if (strcasecmp(hexsl, ADMIN_LOW) == 0) {
1317 /* must be readonly */
1320 if (dsl_prop_get_integer(dsname,
1321 zfs_prop_to_name(ZFS_PROP_READONLY), &rdonly, NULL))
1322 return (SET_ERROR(EACCES));
1323 return (rdonly ? 0 : EACCES);
1325 return (SET_ERROR(EACCES));
1329 * Determine whether the mount is allowed according to MAC check.
1330 * by comparing (where appropriate) label of the dataset against
1331 * the label of the zone being mounted into. If the dataset has
1332 * no label, create one.
1334 * Returns 0 if access allowed, error otherwise (e.g. EACCES)
1337 zfs_mount_label_policy(vfs_t *vfsp, char *osname)
1340 zone_t *mntzone = NULL;
1341 ts_label_t *mnt_tsl;
1344 char ds_hexsl[MAXNAMELEN];
1346 retv = EACCES; /* assume the worst */
1349 * Start by getting the dataset label if it exists.
1351 error = dsl_prop_get(osname, zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1352 1, sizeof (ds_hexsl), &ds_hexsl, NULL);
1354 return (SET_ERROR(EACCES));
1357 * If labeling is NOT enabled, then disallow the mount of datasets
1358 * which have a non-default label already. No other label checks
1361 if (!is_system_labeled()) {
1362 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0)
1364 return (SET_ERROR(EACCES));
1368 * Get the label of the mountpoint. If mounting into the global
1369 * zone (i.e. mountpoint is not within an active zone and the
1370 * zoned property is off), the label must be default or
1371 * admin_low/admin_high only; no other checks are needed.
1373 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE);
1374 if (mntzone->zone_id == GLOBAL_ZONEID) {
1379 if (dsl_prop_get_integer(osname,
1380 zfs_prop_to_name(ZFS_PROP_ZONED), &zoned, NULL))
1381 return (SET_ERROR(EACCES));
1383 return (zfs_check_global_label(osname, ds_hexsl));
1386 * This is the case of a zone dataset being mounted
1387 * initially, before the zone has been fully created;
1388 * allow this mount into global zone.
1393 mnt_tsl = mntzone->zone_slabel;
1394 ASSERT(mnt_tsl != NULL);
1395 label_hold(mnt_tsl);
1396 mnt_sl = label2bslabel(mnt_tsl);
1398 if (strcasecmp(ds_hexsl, ZFS_MLSLABEL_DEFAULT) == 0) {
1400 * The dataset doesn't have a real label, so fabricate one.
1404 if (l_to_str_internal(mnt_sl, &str) == 0 &&
1405 dsl_prop_set_string(osname,
1406 zfs_prop_to_name(ZFS_PROP_MLSLABEL),
1407 ZPROP_SRC_LOCAL, str) == 0)
1410 kmem_free(str, strlen(str) + 1);
1411 } else if (hexstr_to_label(ds_hexsl, &ds_sl) == 0) {
1413 * Now compare labels to complete the MAC check. If the
1414 * labels are equal then allow access. If the mountpoint
1415 * label dominates the dataset label, allow readonly access.
1416 * Otherwise, access is denied.
1418 if (blequal(mnt_sl, &ds_sl))
1420 else if (bldominates(mnt_sl, &ds_sl)) {
1421 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0);
1426 label_rele(mnt_tsl);
1430 #endif /* SECLABEL */
1432 #ifdef OPENSOLARIS_MOUNTROOT
1434 zfs_mountroot(vfs_t *vfsp, enum whymountroot why)
1437 static int zfsrootdone = 0;
1438 zfsvfs_t *zfsvfs = NULL;
1447 * The filesystem that we mount as root is defined in the
1448 * boot property "zfs-bootfs" with a format of
1449 * "poolname/root-dataset-objnum".
1451 if (why == ROOT_INIT) {
1453 return (SET_ERROR(EBUSY));
1455 * the process of doing a spa_load will require the
1456 * clock to be set before we could (for example) do
1457 * something better by looking at the timestamp on
1458 * an uberblock, so just set it to -1.
1462 if ((zfs_bootfs = spa_get_bootprop("zfs-bootfs")) == NULL) {
1463 cmn_err(CE_NOTE, "spa_get_bootfs: can not get "
1465 return (SET_ERROR(EINVAL));
1467 zfs_devid = spa_get_bootprop("diskdevid");
1468 error = spa_import_rootpool(rootfs.bo_name, zfs_devid);
1470 spa_free_bootprop(zfs_devid);
1472 spa_free_bootprop(zfs_bootfs);
1473 cmn_err(CE_NOTE, "spa_import_rootpool: error %d",
1477 if (error = zfs_parse_bootfs(zfs_bootfs, rootfs.bo_name)) {
1478 spa_free_bootprop(zfs_bootfs);
1479 cmn_err(CE_NOTE, "zfs_parse_bootfs: error %d",
1484 spa_free_bootprop(zfs_bootfs);
1486 if (error = vfs_lock(vfsp))
1489 if (error = zfs_domount(vfsp, rootfs.bo_name)) {
1490 cmn_err(CE_NOTE, "zfs_domount: error %d", error);
1494 zfsvfs = (zfsvfs_t *)vfsp->vfs_data;
1496 if (error = zfs_zget(zfsvfs, zfsvfs->z_root, &zp)) {
1497 cmn_err(CE_NOTE, "zfs_zget: error %d", error);
1502 mutex_enter(&vp->v_lock);
1503 vp->v_flag |= VROOT;
1504 mutex_exit(&vp->v_lock);
1508 * Leave rootvp held. The root file system is never unmounted.
1511 vfs_add((struct vnode *)0, vfsp,
1512 (vfsp->vfs_flag & VFS_RDONLY) ? MS_RDONLY : 0);
1516 } else if (why == ROOT_REMOUNT) {
1517 readonly_changed_cb(vfsp->vfs_data, B_FALSE);
1518 vfsp->vfs_flag |= VFS_REMOUNT;
1520 /* refresh mount options */
1521 zfs_unregister_callbacks(vfsp->vfs_data);
1522 return (zfs_register_callbacks(vfsp));
1524 } else if (why == ROOT_UNMOUNT) {
1525 zfs_unregister_callbacks((zfsvfs_t *)vfsp->vfs_data);
1526 (void) zfs_sync(vfsp, 0, 0);
1531 * if "why" is equal to anything else other than ROOT_INIT,
1532 * ROOT_REMOUNT, or ROOT_UNMOUNT, we do not support it.
1534 return (SET_ERROR(ENOTSUP));
1536 #endif /* OPENSOLARIS_MOUNTROOT */
1539 getpoolname(const char *osname, char *poolname)
1543 p = strchr(osname, '/');
1545 if (strlen(osname) >= MAXNAMELEN)
1546 return (ENAMETOOLONG);
1547 (void) strcpy(poolname, osname);
1549 if (p - osname >= MAXNAMELEN)
1550 return (ENAMETOOLONG);
1551 (void) strncpy(poolname, osname, p - osname);
1552 poolname[p - osname] = '\0';
1559 zfs_mount(vfs_t *vfsp)
1561 kthread_t *td = curthread;
1562 vnode_t *mvp = vfsp->mnt_vnodecovered;
1563 cred_t *cr = td->td_ucred;
1569 if (mvp->v_type != VDIR)
1570 return (SET_ERROR(ENOTDIR));
1572 mutex_enter(&mvp->v_lock);
1573 if ((uap->flags & MS_REMOUNT) == 0 &&
1574 (uap->flags & MS_OVERLAY) == 0 &&
1575 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
1576 mutex_exit(&mvp->v_lock);
1577 return (SET_ERROR(EBUSY));
1579 mutex_exit(&mvp->v_lock);
1582 * ZFS does not support passing unparsed data in via MS_DATA.
1583 * Users should use the MS_OPTIONSTR interface; this means
1584 * that all option parsing is already done and the options struct
1585 * can be interrogated.
1587 if ((uap->flags & MS_DATA) && uap->datalen > 0)
1588 #else /* !illumos */
1589 if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_ZFS))
1590 return (SET_ERROR(EPERM));
1592 if (vfs_getopt(vfsp->mnt_optnew, "from", (void **)&osname, NULL))
1593 return (SET_ERROR(EINVAL));
1594 #endif /* illumos */
1597 * If full-owner-access is enabled and delegated administration is
1598 * turned on, we must set nosuid.
1600 if (zfs_super_owner &&
1601 dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != ECANCELED) {
1602 secpolicy_fs_mount_clearopts(cr, vfsp);
1606 * Check for mount privilege?
1608 * If we don't have privilege then see if
1609 * we have local permission to allow it
1611 error = secpolicy_fs_mount(cr, mvp, vfsp);
1613 if (dsl_deleg_access(osname, ZFS_DELEG_PERM_MOUNT, cr) != 0)
1616 if (!(vfsp->vfs_flag & MS_REMOUNT)) {
1620 * Make sure user is the owner of the mount point
1621 * or has sufficient privileges.
1624 vattr.va_mask = AT_UID;
1626 vn_lock(mvp, LK_SHARED | LK_RETRY);
1627 if (VOP_GETATTR(mvp, &vattr, cr)) {
1632 if (secpolicy_vnode_owner(mvp, cr, vattr.va_uid) != 0 &&
1633 VOP_ACCESS(mvp, VWRITE, cr, td) != 0) {
1640 secpolicy_fs_mount_clearopts(cr, vfsp);
1644 * Refuse to mount a filesystem if we are in a local zone and the
1645 * dataset is not visible.
1647 if (!INGLOBALZONE(curthread) &&
1648 (!zone_dataset_visible(osname, &canwrite) || !canwrite)) {
1649 error = SET_ERROR(EPERM);
1654 error = zfs_mount_label_policy(vfsp, osname);
1659 vfsp->vfs_flag |= MNT_NFS4ACLS;
1662 * When doing a remount, we simply refresh our temporary properties
1663 * according to those options set in the current VFS options.
1665 if (vfsp->vfs_flag & MS_REMOUNT) {
1666 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1669 * Refresh mount options with z_teardown_lock blocking I/O while
1670 * the filesystem is in an inconsistent state.
1671 * The lock also serializes this code with filesystem
1672 * manipulations between entry to zfs_suspend_fs() and return
1673 * from zfs_resume_fs().
1675 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1676 zfs_unregister_callbacks(zfsvfs);
1677 error = zfs_register_callbacks(vfsp);
1678 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
1682 /* Initial root mount: try hard to import the requested root pool. */
1683 if ((vfsp->vfs_flag & MNT_ROOTFS) != 0 &&
1684 (vfsp->vfs_flag & MNT_UPDATE) == 0) {
1685 char pname[MAXNAMELEN];
1687 error = getpoolname(osname, pname);
1689 error = spa_import_rootpool(pname);
1694 error = zfs_domount(vfsp, osname);
1699 * Add an extra VFS_HOLD on our parent vfs so that it can't
1700 * disappear due to a forced unmount.
1702 if (error == 0 && ((zfsvfs_t *)vfsp->vfs_data)->z_issnap)
1703 VFS_HOLD(mvp->v_vfsp);
1711 zfs_statfs(vfs_t *vfsp, struct statfs *statp)
1713 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1714 uint64_t refdbytes, availbytes, usedobjs, availobjs;
1716 statp->f_version = STATFS_VERSION;
1720 dmu_objset_space(zfsvfs->z_os,
1721 &refdbytes, &availbytes, &usedobjs, &availobjs);
1724 * The underlying storage pool actually uses multiple block sizes.
1725 * We report the fragsize as the smallest block size we support,
1726 * and we report our blocksize as the filesystem's maximum blocksize.
1728 statp->f_bsize = SPA_MINBLOCKSIZE;
1729 statp->f_iosize = zfsvfs->z_vfs->mnt_stat.f_iosize;
1732 * The following report "total" blocks of various kinds in the
1733 * file system, but reported in terms of f_frsize - the
1737 statp->f_blocks = (refdbytes + availbytes) >> SPA_MINBLOCKSHIFT;
1738 statp->f_bfree = availbytes / statp->f_bsize;
1739 statp->f_bavail = statp->f_bfree; /* no root reservation */
1742 * statvfs() should really be called statufs(), because it assumes
1743 * static metadata. ZFS doesn't preallocate files, so the best
1744 * we can do is report the max that could possibly fit in f_files,
1745 * and that minus the number actually used in f_ffree.
1746 * For f_ffree, report the smaller of the number of object available
1747 * and the number of blocks (each object will take at least a block).
1749 statp->f_ffree = MIN(availobjs, statp->f_bfree);
1750 statp->f_files = statp->f_ffree + usedobjs;
1753 * We're a zfs filesystem.
1755 (void) strlcpy(statp->f_fstypename, "zfs", sizeof(statp->f_fstypename));
1757 strlcpy(statp->f_mntfromname, vfsp->mnt_stat.f_mntfromname,
1758 sizeof(statp->f_mntfromname));
1759 strlcpy(statp->f_mntonname, vfsp->mnt_stat.f_mntonname,
1760 sizeof(statp->f_mntonname));
1762 statp->f_namemax = ZFS_MAXNAMELEN;
1769 zfs_root(vfs_t *vfsp, int flags, vnode_t **vpp)
1771 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1777 error = zfs_zget(zfsvfs, zfsvfs->z_root, &rootzp);
1779 *vpp = ZTOV(rootzp);
1784 error = vn_lock(*vpp, flags);
1786 (*vpp)->v_vflag |= VV_ROOT;
1795 * Teardown the zfsvfs::z_os.
1797 * Note, if 'unmounting' if FALSE, we return with the 'z_teardown_lock'
1798 * and 'z_teardown_inactive_lock' held.
1801 zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
1805 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1809 * We purge the parent filesystem's vfsp as the parent
1810 * filesystem and all of its snapshots have their vnode's
1811 * v_vfsp set to the parent's filesystem's vfsp. Note,
1812 * 'z_parent' is self referential for non-snapshots.
1814 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1815 #ifdef FREEBSD_NAMECACHE
1816 cache_purgevfs(zfsvfs->z_parent->z_vfs);
1821 * Close the zil. NB: Can't close the zil while zfs_inactive
1822 * threads are blocked as zil_close can call zfs_inactive.
1824 if (zfsvfs->z_log) {
1825 zil_close(zfsvfs->z_log);
1826 zfsvfs->z_log = NULL;
1829 rw_enter(&zfsvfs->z_teardown_inactive_lock, RW_WRITER);
1832 * If we are not unmounting (ie: online recv) and someone already
1833 * unmounted this file system while we were doing the switcheroo,
1834 * or a reopen of z_os failed then just bail out now.
1836 if (!unmounting && (zfsvfs->z_unmounted || zfsvfs->z_os == NULL)) {
1837 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1838 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
1839 return (SET_ERROR(EIO));
1843 * At this point there are no vops active, and any new vops will
1844 * fail with EIO since we have z_teardown_lock for writer (only
1845 * relavent for forced unmount).
1847 * Release all holds on dbufs.
1849 mutex_enter(&zfsvfs->z_znodes_lock);
1850 for (zp = list_head(&zfsvfs->z_all_znodes); zp != NULL;
1851 zp = list_next(&zfsvfs->z_all_znodes, zp))
1853 ASSERT(ZTOV(zp)->v_count >= 0);
1854 zfs_znode_dmu_fini(zp);
1856 mutex_exit(&zfsvfs->z_znodes_lock);
1859 * If we are unmounting, set the unmounted flag and let new vops
1860 * unblock. zfs_inactive will have the unmounted behavior, and all
1861 * other vops will fail with EIO.
1864 zfsvfs->z_unmounted = B_TRUE;
1865 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
1866 rw_exit(&zfsvfs->z_teardown_inactive_lock);
1870 * z_os will be NULL if there was an error in attempting to reopen
1871 * zfsvfs, so just return as the properties had already been
1872 * unregistered and cached data had been evicted before.
1874 if (zfsvfs->z_os == NULL)
1878 * Unregister properties.
1880 zfs_unregister_callbacks(zfsvfs);
1885 if (dsl_dataset_is_dirty(dmu_objset_ds(zfsvfs->z_os)) &&
1886 !(zfsvfs->z_vfs->vfs_flag & VFS_RDONLY))
1887 txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
1888 dmu_objset_evict_dbufs(zfsvfs->z_os);
1895 zfs_umount(vfs_t *vfsp, int fflag)
1897 kthread_t *td = curthread;
1898 zfsvfs_t *zfsvfs = vfsp->vfs_data;
1900 cred_t *cr = td->td_ucred;
1903 ret = secpolicy_fs_unmount(cr, vfsp);
1905 if (dsl_deleg_access((char *)refstr_value(vfsp->vfs_resource),
1906 ZFS_DELEG_PERM_MOUNT, cr))
1911 * We purge the parent filesystem's vfsp as the parent filesystem
1912 * and all of its snapshots have their vnode's v_vfsp set to the
1913 * parent's filesystem's vfsp. Note, 'z_parent' is self
1914 * referential for non-snapshots.
1916 (void) dnlc_purge_vfsp(zfsvfs->z_parent->z_vfs, 0);
1919 * Unmount any snapshots mounted under .zfs before unmounting the
1922 if (zfsvfs->z_ctldir != NULL) {
1923 if ((ret = zfsctl_umount_snapshots(vfsp, fflag, cr)) != 0)
1925 ret = vflush(vfsp, 0, 0, td);
1926 ASSERT(ret == EBUSY);
1927 if (!(fflag & MS_FORCE)) {
1928 if (zfsvfs->z_ctldir->v_count > 1)
1930 ASSERT(zfsvfs->z_ctldir->v_count == 1);
1932 zfsctl_destroy(zfsvfs);
1933 ASSERT(zfsvfs->z_ctldir == NULL);
1936 if (fflag & MS_FORCE) {
1938 * Mark file system as unmounted before calling
1939 * vflush(FORCECLOSE). This way we ensure no future vnops
1940 * will be called and risk operating on DOOMED vnodes.
1942 rrm_enter(&zfsvfs->z_teardown_lock, RW_WRITER, FTAG);
1943 zfsvfs->z_unmounted = B_TRUE;
1944 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
1948 * Flush all the files.
1950 ret = vflush(vfsp, 0, (fflag & MS_FORCE) ? FORCECLOSE : 0, td);
1952 if (!zfsvfs->z_issnap) {
1953 zfsctl_create(zfsvfs);
1954 ASSERT(zfsvfs->z_ctldir != NULL);
1960 if (!(fflag & MS_FORCE)) {
1962 * Check the number of active vnodes in the file system.
1963 * Our count is maintained in the vfs structure, but the
1964 * number is off by 1 to indicate a hold on the vfs
1967 * The '.zfs' directory maintains a reference of its
1968 * own, and any active references underneath are
1969 * reflected in the vnode count.
1971 if (zfsvfs->z_ctldir == NULL) {
1972 if (vfsp->vfs_count > 1)
1973 return (SET_ERROR(EBUSY));
1975 if (vfsp->vfs_count > 2 ||
1976 zfsvfs->z_ctldir->v_count > 1)
1977 return (SET_ERROR(EBUSY));
1982 VERIFY(zfsvfs_teardown(zfsvfs, B_TRUE) == 0);
1986 * z_os will be NULL if there was an error in
1987 * attempting to reopen zfsvfs.
1991 * Unset the objset user_ptr.
1993 mutex_enter(&os->os_user_ptr_lock);
1994 dmu_objset_set_user(os, NULL);
1995 mutex_exit(&os->os_user_ptr_lock);
1998 * Finally release the objset
2000 dmu_objset_disown(os, zfsvfs);
2004 * We can now safely destroy the '.zfs' directory node.
2006 if (zfsvfs->z_ctldir != NULL)
2007 zfsctl_destroy(zfsvfs);
2008 if (zfsvfs->z_issnap) {
2009 vnode_t *svp = vfsp->mnt_vnodecovered;
2011 if (svp->v_count >= 2)
2020 zfs_vget(vfs_t *vfsp, ino_t ino, int flags, vnode_t **vpp)
2022 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2027 * zfs_zget() can't operate on virtual entries like .zfs/ or
2028 * .zfs/snapshot/ directories, that's why we return EOPNOTSUPP.
2029 * This will make NFS to switch to LOOKUP instead of using VGET.
2031 if (ino == ZFSCTL_INO_ROOT || ino == ZFSCTL_INO_SNAPDIR ||
2032 (zfsvfs->z_shares_dir != 0 && ino == zfsvfs->z_shares_dir))
2033 return (EOPNOTSUPP);
2036 err = zfs_zget(zfsvfs, ino, &zp);
2037 if (err == 0 && zp->z_unlinked) {
2045 err = vn_lock(*vpp, flags);
2052 zfs_checkexp(vfs_t *vfsp, struct sockaddr *nam, int *extflagsp,
2053 struct ucred **credanonp, int *numsecflavors, int **secflavors)
2055 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2058 * If this is regular file system vfsp is the same as
2059 * zfsvfs->z_parent->z_vfs, but if it is snapshot,
2060 * zfsvfs->z_parent->z_vfs represents parent file system
2061 * which we have to use here, because only this file system
2062 * has mnt_export configured.
2064 return (vfs_stdcheckexp(zfsvfs->z_parent->z_vfs, nam, extflagsp,
2065 credanonp, numsecflavors, secflavors));
2068 CTASSERT(SHORT_FID_LEN <= sizeof(struct fid));
2069 CTASSERT(LONG_FID_LEN <= sizeof(struct fid));
2072 zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp)
2074 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2076 uint64_t object = 0;
2077 uint64_t fid_gen = 0;
2087 * On FreeBSD we can get snapshot's mount point or its parent file
2088 * system mount point depending if snapshot is already mounted or not.
2090 if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
2091 zfid_long_t *zlfid = (zfid_long_t *)fidp;
2092 uint64_t objsetid = 0;
2093 uint64_t setgen = 0;
2095 for (i = 0; i < sizeof (zlfid->zf_setid); i++)
2096 objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
2098 for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
2099 setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
2103 err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
2105 return (SET_ERROR(EINVAL));
2109 if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
2110 zfid_short_t *zfid = (zfid_short_t *)fidp;
2112 for (i = 0; i < sizeof (zfid->zf_object); i++)
2113 object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
2115 for (i = 0; i < sizeof (zfid->zf_gen); i++)
2116 fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
2119 return (SET_ERROR(EINVAL));
2123 * A zero fid_gen means we are in .zfs or the .zfs/snapshot
2124 * directory tree. If the object == zfsvfs->z_shares_dir, then
2125 * we are in the .zfs/shares directory tree.
2127 if ((fid_gen == 0 &&
2128 (object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) ||
2129 (zfsvfs->z_shares_dir != 0 && object == zfsvfs->z_shares_dir)) {
2130 *vpp = zfsvfs->z_ctldir;
2131 ASSERT(*vpp != NULL);
2132 if (object == ZFSCTL_INO_SNAPDIR) {
2133 VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL,
2134 0, NULL, NULL, NULL, NULL, NULL) == 0);
2135 } else if (object == zfsvfs->z_shares_dir) {
2136 VERIFY(zfsctl_root_lookup(*vpp, "shares", vpp, NULL,
2137 0, NULL, NULL, NULL, NULL, NULL) == 0);
2142 err = vn_lock(*vpp, flags);
2148 gen_mask = -1ULL >> (64 - 8 * i);
2150 dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
2151 if (err = zfs_zget(zfsvfs, object, &zp)) {
2155 (void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zfsvfs), &zp_gen,
2157 zp_gen = zp_gen & gen_mask;
2160 if (zp->z_unlinked || zp_gen != fid_gen) {
2161 dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
2164 return (SET_ERROR(EINVAL));
2169 err = vn_lock(*vpp, flags | LK_RETRY);
2171 vnode_create_vobject(*vpp, zp->z_size, curthread);
2178 * Block out VOPs and close zfsvfs_t::z_os
2180 * Note, if successful, then we return with the 'z_teardown_lock' and
2181 * 'z_teardown_inactive_lock' write held. We leave ownership of the underlying
2182 * dataset and objset intact so that they can be atomically handed off during
2183 * a subsequent rollback or recv operation and the resume thereafter.
2186 zfs_suspend_fs(zfsvfs_t *zfsvfs)
2190 if ((error = zfsvfs_teardown(zfsvfs, B_FALSE)) != 0)
2197 * Rebuild SA and release VOPs. Note that ownership of the underlying dataset
2198 * is an invariant across any of the operations that can be performed while the
2199 * filesystem was suspended. Whether it succeeded or failed, the preconditions
2200 * are the same: the relevant objset and associated dataset are owned by
2201 * zfsvfs, held, and long held on entry.
2204 zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname)
2208 uint64_t sa_obj = 0;
2210 ASSERT(RRM_WRITE_HELD(&zfsvfs->z_teardown_lock));
2211 ASSERT(RW_WRITE_HELD(&zfsvfs->z_teardown_inactive_lock));
2214 * We already own this, so just hold and rele it to update the
2215 * objset_t, as the one we had before may have been evicted.
2217 VERIFY0(dmu_objset_hold(osname, zfsvfs, &zfsvfs->z_os));
2218 VERIFY3P(zfsvfs->z_os->os_dsl_dataset->ds_owner, ==, zfsvfs);
2219 VERIFY(dsl_dataset_long_held(zfsvfs->z_os->os_dsl_dataset));
2220 dmu_objset_rele(zfsvfs->z_os, zfsvfs);
2223 * Make sure version hasn't changed
2226 err = zfs_get_zplprop(zfsvfs->z_os, ZFS_PROP_VERSION,
2227 &zfsvfs->z_version);
2232 err = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ,
2233 ZFS_SA_ATTRS, 8, 1, &sa_obj);
2235 if (err && zfsvfs->z_version >= ZPL_VERSION_SA)
2238 if ((err = sa_setup(zfsvfs->z_os, sa_obj,
2239 zfs_attr_table, ZPL_END, &zfsvfs->z_attr_table)) != 0)
2242 if (zfsvfs->z_version >= ZPL_VERSION_SA)
2243 sa_register_update_callback(zfsvfs->z_os,
2246 VERIFY(zfsvfs_setup(zfsvfs, B_FALSE) == 0);
2248 zfs_set_fuid_feature(zfsvfs);
2251 * Attempt to re-establish all the active znodes with
2252 * their dbufs. If a zfs_rezget() fails, then we'll let
2253 * any potential callers discover that via ZFS_ENTER_VERIFY_VP
2254 * when they try to use their znode.
2256 mutex_enter(&zfsvfs->z_znodes_lock);
2257 for (zp = list_head(&zfsvfs->z_all_znodes); zp;
2258 zp = list_next(&zfsvfs->z_all_znodes, zp)) {
2259 (void) zfs_rezget(zp);
2261 mutex_exit(&zfsvfs->z_znodes_lock);
2264 /* release the VOPs */
2265 rw_exit(&zfsvfs->z_teardown_inactive_lock);
2266 rrm_exit(&zfsvfs->z_teardown_lock, FTAG);
2270 * Since we couldn't setup the sa framework, try to force
2271 * unmount this file system.
2273 if (vn_vfswlock(zfsvfs->z_vfs->vfs_vnodecovered) == 0) {
2274 vfs_ref(zfsvfs->z_vfs);
2275 (void) dounmount(zfsvfs->z_vfs, MS_FORCE, curthread);
2282 zfs_freevfs(vfs_t *vfsp)
2284 zfsvfs_t *zfsvfs = vfsp->vfs_data;
2288 * If this is a snapshot, we have an extra VFS_HOLD on our parent
2289 * from zfs_mount(). Release it here. If we came through
2290 * zfs_mountroot() instead, we didn't grab an extra hold, so
2291 * skip the VFS_RELE for rootvfs.
2293 if (zfsvfs->z_issnap && (vfsp != rootvfs))
2294 VFS_RELE(zfsvfs->z_parent->z_vfs);
2297 zfsvfs_free(zfsvfs);
2299 atomic_dec_32(&zfs_active_fs_count);
2303 static int desiredvnodes_backup;
2307 zfs_vnodes_adjust(void)
2310 int newdesiredvnodes;
2312 desiredvnodes_backup = desiredvnodes;
2315 * We calculate newdesiredvnodes the same way it is done in
2316 * vntblinit(). If it is equal to desiredvnodes, it means that
2317 * it wasn't tuned by the administrator and we can tune it down.
2319 newdesiredvnodes = min(maxproc + cnt.v_page_count / 4, 2 *
2320 vm_kmem_size / (5 * (sizeof(struct vm_object) +
2321 sizeof(struct vnode))));
2322 if (newdesiredvnodes == desiredvnodes)
2323 desiredvnodes = (3 * newdesiredvnodes) / 4;
2328 zfs_vnodes_adjust_back(void)
2332 desiredvnodes = desiredvnodes_backup;
2340 printf("ZFS filesystem version: " ZPL_VERSION_STRING "\n");
2343 * Initialize .zfs directory structures
2348 * Initialize znode cache, vnode ops, etc...
2353 * Reduce number of vnodes. Originally number of vnodes is calculated
2354 * with UFS inode in mind. We reduce it here, because it's too big for
2357 zfs_vnodes_adjust();
2359 dmu_objset_register_type(DMU_OST_ZFS, zfs_space_delta_cb);
2367 zfs_vnodes_adjust_back();
2373 return (zfs_active_fs_count != 0);
2377 zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers)
2380 objset_t *os = zfsvfs->z_os;
2383 if (newvers < ZPL_VERSION_INITIAL || newvers > ZPL_VERSION)
2384 return (SET_ERROR(EINVAL));
2386 if (newvers < zfsvfs->z_version)
2387 return (SET_ERROR(EINVAL));
2389 if (zfs_spa_version_map(newvers) >
2390 spa_version(dmu_objset_spa(zfsvfs->z_os)))
2391 return (SET_ERROR(ENOTSUP));
2393 tx = dmu_tx_create(os);
2394 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_FALSE, ZPL_VERSION_STR);
2395 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2396 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, B_TRUE,
2398 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL);
2400 error = dmu_tx_assign(tx, TXG_WAIT);
2406 error = zap_update(os, MASTER_NODE_OBJ, ZPL_VERSION_STR,
2407 8, 1, &newvers, tx);
2414 if (newvers >= ZPL_VERSION_SA && !zfsvfs->z_use_sa) {
2417 ASSERT3U(spa_version(dmu_objset_spa(zfsvfs->z_os)), >=,
2419 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
2420 DMU_OT_NONE, 0, tx);
2422 error = zap_add(os, MASTER_NODE_OBJ,
2423 ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
2426 VERIFY(0 == sa_set_sa_object(os, sa_obj));
2427 sa_register_update_callback(os, zfs_sa_upgrade);
2430 spa_history_log_internal_ds(dmu_objset_ds(os), "upgrade", tx,
2431 "from %llu to %llu", zfsvfs->z_version, newvers);
2435 zfsvfs->z_version = newvers;
2437 zfs_set_fuid_feature(zfsvfs);
2443 * Read a property stored within the master node.
2446 zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
2452 * Look up the file system's value for the property. For the
2453 * version property, we look up a slightly different string.
2455 if (prop == ZFS_PROP_VERSION)
2456 pname = ZPL_VERSION_STR;
2458 pname = zfs_prop_to_name(prop);
2461 error = zap_lookup(os, MASTER_NODE_OBJ, pname, 8, 1, value);
2463 if (error == ENOENT) {
2464 /* No value set, use the default value */
2466 case ZFS_PROP_VERSION:
2467 *value = ZPL_VERSION;
2469 case ZFS_PROP_NORMALIZE:
2470 case ZFS_PROP_UTF8ONLY:
2474 *value = ZFS_CASE_SENSITIVE;
2486 zfsvfs_update_fromname(const char *oldname, const char *newname)
2488 char tmpbuf[MAXPATHLEN];
2493 oldlen = strlen(oldname);
2495 mtx_lock(&mountlist_mtx);
2496 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
2497 fromname = mp->mnt_stat.f_mntfromname;
2498 if (strcmp(fromname, oldname) == 0) {
2499 (void)strlcpy(fromname, newname,
2500 sizeof(mp->mnt_stat.f_mntfromname));
2503 if (strncmp(fromname, oldname, oldlen) == 0 &&
2504 (fromname[oldlen] == '/' || fromname[oldlen] == '@')) {
2505 (void)snprintf(tmpbuf, sizeof(tmpbuf), "%s%s",
2506 newname, fromname + oldlen);
2507 (void)strlcpy(fromname, tmpbuf,
2508 sizeof(mp->mnt_stat.f_mntfromname));
2512 mtx_unlock(&mountlist_mtx);