1 /*
2 * Copyright (c) 2020 iXsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/types.h>
29 #include <sys/errno.h>
30 #include <sys/nvpair.h>
31 #include <sys/spa_impl.h>
32 #include <sys/vdev_os.h>
33 #include <sys/zfs_vfsops.h>
34 #include <sys/zone.h>
35 #include <vm/vm_pageout.h>
36
37 #include <sys/zfs_ioctl_impl.h>
38
39 int
zfs_vfs_ref(zfsvfs_t ** zfvp)40 zfs_vfs_ref(zfsvfs_t **zfvp)
41 {
42 int error = 0;
43
44 if (*zfvp == NULL)
45 return (SET_ERROR(ESRCH));
46
47 error = vfs_busy((*zfvp)->z_vfs, 0);
48 if (error != 0) {
49 *zfvp = NULL;
50 error = SET_ERROR(ESRCH);
51 }
52 return (error);
53 }
54
55 boolean_t
zfs_vfs_held(zfsvfs_t * zfsvfs)56 zfs_vfs_held(zfsvfs_t *zfsvfs)
57 {
58 return (zfsvfs->z_vfs != NULL);
59 }
60
61 void
zfs_vfs_rele(zfsvfs_t * zfsvfs)62 zfs_vfs_rele(zfsvfs_t *zfsvfs)
63 {
64 vfs_unbusy(zfsvfs->z_vfs);
65 }
66
67 static const zfs_ioc_key_t zfs_keys_nextboot[] = {
68 {"command", DATA_TYPE_STRING, 0},
69 { ZPOOL_CONFIG_POOL_GUID, DATA_TYPE_UINT64, 0},
70 { ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64, 0}
71 };
72
73 static int
zfs_ioc_jail(zfs_cmd_t * zc)74 zfs_ioc_jail(zfs_cmd_t *zc)
75 {
76
77 return (zone_dataset_attach(curthread->td_ucred, zc->zc_name,
78 (int)zc->zc_zoneid));
79 }
80
81 static int
zfs_ioc_unjail(zfs_cmd_t * zc)82 zfs_ioc_unjail(zfs_cmd_t *zc)
83 {
84
85 return (zone_dataset_detach(curthread->td_ucred, zc->zc_name,
86 (int)zc->zc_zoneid));
87 }
88
89 static int
zfs_ioc_nextboot(const char * unused,nvlist_t * innvl,nvlist_t * outnvl)90 zfs_ioc_nextboot(const char *unused, nvlist_t *innvl, nvlist_t *outnvl)
91 {
92 char name[MAXNAMELEN];
93 spa_t *spa;
94 vdev_t *vd;
95 const char *command;
96 uint64_t pool_guid;
97 uint64_t vdev_guid;
98 int error;
99
100 if (nvlist_lookup_uint64(innvl,
101 ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
102 return (EINVAL);
103 if (nvlist_lookup_uint64(innvl,
104 ZPOOL_CONFIG_GUID, &vdev_guid) != 0)
105 return (EINVAL);
106 if (nvlist_lookup_string(innvl,
107 "command", &command) != 0)
108 return (EINVAL);
109
110 mutex_enter(&spa_namespace_lock);
111 spa = spa_by_guid(pool_guid, vdev_guid);
112 if (spa != NULL)
113 strcpy(name, spa_name(spa));
114 mutex_exit(&spa_namespace_lock);
115 if (spa == NULL)
116 return (ENOENT);
117
118 if ((error = spa_open(name, &spa, FTAG)) != 0)
119 return (error);
120 spa_vdev_state_enter(spa, SCL_ALL);
121 vd = spa_lookup_by_guid(spa, vdev_guid, B_TRUE);
122 if (vd == NULL) {
123 (void) spa_vdev_state_exit(spa, NULL, ENXIO);
124 spa_close(spa, FTAG);
125 return (ENODEV);
126 }
127 error = vdev_label_write_pad2(vd, command, strlen(command));
128 (void) spa_vdev_state_exit(spa, NULL, 0);
129 txg_wait_synced(spa->spa_dsl_pool, 0);
130 spa_close(spa, FTAG);
131 return (error);
132 }
133
134 /* Update the VFS's cache of mountpoint properties */
135 void
zfs_ioctl_update_mount_cache(const char * dsname)136 zfs_ioctl_update_mount_cache(const char *dsname)
137 {
138 zfsvfs_t *zfsvfs;
139
140 if (getzfsvfs(dsname, &zfsvfs) == 0) {
141 struct mount *mp = zfsvfs->z_vfs;
142 VFS_STATFS(mp, &mp->mnt_stat);
143 zfs_vfs_rele(zfsvfs);
144 }
145 /*
146 * Ignore errors; we can't do anything useful if either getzfsvfs or
147 * VFS_STATFS fails.
148 */
149 }
150
151 uint64_t
zfs_max_nvlist_src_size_os(void)152 zfs_max_nvlist_src_size_os(void)
153 {
154 if (zfs_max_nvlist_src_size != 0)
155 return (zfs_max_nvlist_src_size);
156
157 return (ptob(vm_page_max_user_wired) / 4);
158 }
159
160 void
zfs_ioctl_init_os(void)161 zfs_ioctl_init_os(void)
162 {
163 zfs_ioctl_register_dataset_nolog(ZFS_IOC_JAIL, zfs_ioc_jail,
164 zfs_secpolicy_config, POOL_CHECK_NONE);
165 zfs_ioctl_register_dataset_nolog(ZFS_IOC_UNJAIL, zfs_ioc_unjail,
166 zfs_secpolicy_config, POOL_CHECK_NONE);
167 zfs_ioctl_register("fbsd_nextboot", ZFS_IOC_NEXTBOOT,
168 zfs_ioc_nextboot, zfs_secpolicy_config, NO_NAME,
169 POOL_CHECK_NONE, B_FALSE, B_FALSE, zfs_keys_nextboot, 3);
170
171 }
172