diff options
Diffstat (limited to 'module/zfs/zfs_ioctl.c')
| -rw-r--r-- | module/zfs/zfs_ioctl.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c index 2104bef71..d55ce20ef 100644 --- a/module/zfs/zfs_ioctl.c +++ b/module/zfs/zfs_ioctl.c @@ -3513,6 +3513,58 @@ zfs_ioc_log_history(const char *unused, nvlist_t *innvl, nvlist_t *outnvl) } /* + * This ioctl is used to set the bootenv configuration on the current + * pool. This configuration is stored in the second padding area of the label, + * and it is used by the GRUB bootloader used on Linux to store the contents + * of the grubenv file. The file is stored as raw ASCII, and is protected by + * an embedded checksum. By default, GRUB will check if the boot filesystem + * supports storing the environment data in a special location, and if so, + * will invoke filesystem specific logic to retrieve it. This can be overriden + * by a variable, should the user so desire. + */ +/* ARGSUSED */ +static const zfs_ioc_key_t zfs_keys_set_bootenv[] = { + {"envmap", DATA_TYPE_STRING, 0}, +}; + +static int +zfs_ioc_set_bootenv(const char *name, nvlist_t *innvl, nvlist_t *outnvl) +{ + char *envmap; + int error; + spa_t *spa; + + envmap = fnvlist_lookup_string(innvl, "envmap"); + if ((error = spa_open(name, &spa, FTAG)) != 0) + return (error); + spa_vdev_state_enter(spa, SCL_ALL); + error = vdev_label_write_bootenv(spa->spa_root_vdev, envmap); + (void) spa_vdev_state_exit(spa, NULL, 0); + spa_close(spa, FTAG); + return (error); +} + +static const zfs_ioc_key_t zfs_keys_get_bootenv[] = { + /* no nvl keys */ +}; + +/* ARGSUSED */ +static int +zfs_ioc_get_bootenv(const char *name, nvlist_t *innvl, nvlist_t *outnvl) +{ + spa_t *spa; + int error; + + if ((error = spa_open(name, &spa, FTAG)) != 0) + return (error); + spa_vdev_state_enter(spa, SCL_ALL); + error = vdev_label_read_bootenv(spa->spa_root_vdev, outnvl); + (void) spa_vdev_state_exit(spa, NULL, 0); + spa_close(spa, FTAG); + return (error); +} + +/* * The dp_config_rwlock must not be held when calling this, because the * unmount may need to write out data. * @@ -6981,6 +7033,16 @@ zfs_ioctl_init(void) POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY, B_FALSE, B_FALSE, zfs_keys_fs_wait, ARRAY_SIZE(zfs_keys_fs_wait)); + zfs_ioctl_register("set_bootenv", ZFS_IOC_SET_BOOTENV, + zfs_ioc_set_bootenv, zfs_secpolicy_config, POOL_NAME, + POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY, B_FALSE, B_TRUE, + zfs_keys_set_bootenv, ARRAY_SIZE(zfs_keys_set_bootenv)); + + zfs_ioctl_register("get_bootenv", ZFS_IOC_GET_BOOTENV, + zfs_ioc_get_bootenv, zfs_secpolicy_none, POOL_NAME, + POOL_CHECK_SUSPENDED, B_FALSE, B_TRUE, + zfs_keys_get_bootenv, ARRAY_SIZE(zfs_keys_get_bootenv)); + /* IOCTLS that use the legacy function signature */ zfs_ioctl_register_legacy(ZFS_IOC_POOL_FREEZE, zfs_ioc_pool_freeze, |