module/os/freebsd/zfs/zfs_ioctl_os.c

   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/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/types.h>
  32 #include <sys/errno.h>
  33 #include <sys/nvpair.h>
  34 #include <sys/spa_impl.h>
  35 #include <sys/vdev_os.h>
  36 #include <sys/zfs_vfsops.h>
  37 #include <sys/zone.h>
  38 #include <vm/vm_pageout.h>
  39
  40 #include <sys/zfs_ioctl_impl.h>
  41
  42 #if __FreeBSD_version < 1201517
  43 #define vm_page_max_user_wired  vm_page_max_wired
  44 #endif
  45
  46 int
  47 zfs_vfs_ref(zfsvfs_t **zfvp)
  48 {
  49         int error = 0;
  50
  51         if (*zfvp == NULL)
  52                 return (SET_ERROR(ESRCH));
  53
  54         error = vfs_busy((*zfvp)->z_vfs, 0);
  55         if (error != 0) {
  56                 *zfvp = NULL;
  57                 error = SET_ERROR(ESRCH);
  58         }
  59         return (error);
  60 }
  61
  62 boolean_t
  63 zfs_vfs_held(zfsvfs_t *zfsvfs)
  64 {
  65         return (zfsvfs->z_vfs != NULL);
  66 }
  67
  68 void
  69 zfs_vfs_rele(zfsvfs_t *zfsvfs)
  70 {
  71         vfs_unbusy(zfsvfs->z_vfs);
  72 }
  73
  74 static const zfs_ioc_key_t zfs_keys_nextboot[] = {
  75         {"command",             DATA_TYPE_STRING,       0},
  76         { ZPOOL_CONFIG_POOL_GUID,               DATA_TYPE_UINT64,       0},
  77         { ZPOOL_CONFIG_GUID,            DATA_TYPE_UINT64,       0}
  78 };
  79
  80 static int
  81 zfs_ioc_jail(zfs_cmd_t *zc)
  82 {
  83
  84         return (zone_dataset_attach(curthread->td_ucred, zc->zc_name,
  85             (int)zc->zc_zoneid));
  86 }
  87
  88 static int
  89 zfs_ioc_unjail(zfs_cmd_t *zc)
  90 {
  91
  92         return (zone_dataset_detach(curthread->td_ucred, zc->zc_name,
  93             (int)zc->zc_zoneid));
  94 }
  95
  96 static int
  97 zfs_ioc_nextboot(const char *unused, nvlist_t *innvl, nvlist_t *outnvl)
  98 {
  99         char name[MAXNAMELEN];
 100         spa_t *spa;
 101         vdev_t *vd;
 102         const char *command;
 103         uint64_t pool_guid;
 104         uint64_t vdev_guid;
 105         int error;
 106
 107         if (nvlist_lookup_uint64(innvl,
 108             ZPOOL_CONFIG_POOL_GUID, &pool_guid) != 0)
 109                 return (EINVAL);
 110         if (nvlist_lookup_uint64(innvl,
 111             ZPOOL_CONFIG_GUID, &vdev_guid) != 0)
 112                 return (EINVAL);
 113         if (nvlist_lookup_string(innvl,
 114             "command", &command) != 0)
 115                 return (EINVAL);
 116
 117         mutex_enter(&spa_namespace_lock);
 118         spa = spa_by_guid(pool_guid, vdev_guid);
 119         if (spa != NULL)
 120                 strcpy(name, spa_name(spa));
 121         mutex_exit(&spa_namespace_lock);
 122         if (spa == NULL)
 123                 return (ENOENT);
 124
 125         if ((error = spa_open(name, &spa, FTAG)) != 0)
 126                 return (error);
 127         spa_vdev_state_enter(spa, SCL_ALL);
 128         vd = spa_lookup_by_guid(spa, vdev_guid, B_TRUE);
 129         if (vd == NULL) {
 130                 (void) spa_vdev_state_exit(spa, NULL, ENXIO);
 131                 spa_close(spa, FTAG);
 132                 return (ENODEV);
 133         }
 134         error = vdev_label_write_pad2(vd, command, strlen(command));
 135         (void) spa_vdev_state_exit(spa, NULL, 0);
 136         txg_wait_synced(spa->spa_dsl_pool, 0);
 137         spa_close(spa, FTAG);
 138         return (error);
 139 }
 140
 141 /* Update the VFS's cache of mountpoint properties */
 142 void
 143 zfs_ioctl_update_mount_cache(const char *dsname)
 144 {
 145         zfsvfs_t *zfsvfs;
 146
 147         if (getzfsvfs(dsname, &zfsvfs) == 0) {
 148                 struct mount *mp = zfsvfs->z_vfs;
 149                 VFS_STATFS(mp, &mp->mnt_stat);
 150                 zfs_vfs_rele(zfsvfs);
 151         }
 152         /*
 153          * Ignore errors; we can't do anything useful if either getzfsvfs or
 154          * VFS_STATFS fails.
 155          */
 156 }
 157
 158 uint64_t
 159 zfs_max_nvlist_src_size_os(void)
 160 {
 161         if (zfs_max_nvlist_src_size != 0)
 162                 return (zfs_max_nvlist_src_size);
 163
 164         return (ptob(vm_page_max_user_wired) / 4);
 165 }
 166
 167 void
 168 zfs_ioctl_init_os(void)
 169 {
 170         zfs_ioctl_register_dataset_nolog(ZFS_IOC_JAIL, zfs_ioc_jail,
 171             zfs_secpolicy_config, POOL_CHECK_NONE);
 172         zfs_ioctl_register_dataset_nolog(ZFS_IOC_UNJAIL, zfs_ioc_unjail,
 173             zfs_secpolicy_config, POOL_CHECK_NONE);
 174         zfs_ioctl_register("fbsd_nextboot", ZFS_IOC_NEXTBOOT,
 175             zfs_ioc_nextboot, zfs_secpolicy_config, NO_NAME,
 176             POOL_CHECK_NONE, B_FALSE, B_FALSE, zfs_keys_nextboot, 3);
 177
 178 }