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/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
  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
  56 zfs_vfs_held(zfsvfs_t *zfsvfs)
  57 {
  58         return (zfsvfs->z_vfs != NULL);
  59 }
  60
  61 void
  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
  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
  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
  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
 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
 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
 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 }