*/
/*
- * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2013 by Delphix. All rights reserved.
*/
#ifndef _LIBZFS_CORE_H
boolean_t lzc_exists(const char *dataset);
+int lzc_rollback(const char *fsname, char *snapnamebuf, int snapnamelen);
#ifdef __cplusplus
}
int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx);
void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
zprop_source_t source, uint64_t value, dmu_tx_t *tx);
-int dsl_dataset_rollback(const char *fsname, void *owner);
+int dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result);
#ifdef ZFS_DEBUG
#define dprintf_ds(ds, fmt, ...) do { \
{
rollback_data_t cb = { 0 };
int err;
- zfs_cmd_t zc = {"\0"};
boolean_t restore_resv = 0;
uint64_t old_volsize = 0, new_volsize;
zfs_prop_t resv_prop = { 0 };
(old_volsize == zfs_prop_get_int(zhp, resv_prop));
}
- (void) strlcpy(zc.zc_name, zhp->zfs_name, sizeof (zc.zc_name));
-
- if (ZFS_IS_VOLUME(zhp))
- zc.zc_objset_type = DMU_OST_ZVOL;
- else
- zc.zc_objset_type = DMU_OST_ZFS;
-
/*
* We rely on zfs_iter_children() to verify that there are no
* newer snapshots for the given dataset. Therefore, we can
* simply pass the name on to the ioctl() call. There is still
* an unlikely race condition where the user has taken a
* snapshot since we verified that this was the most recent.
- *
*/
- if ((err = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_ROLLBACK, &zc)) != 0) {
+ err = lzc_rollback(zhp->zfs_name, NULL, 0);
+ if (err != 0) {
(void) zfs_standard_error_fmt(zhp->zfs_hdl, errno,
dgettext(TEXT_DOMAIN, "cannot rollback '%s'"),
zhp->zfs_name);
*/
/*
- * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2013 Steven Hartland. All rights reserved.
*/
free((void*)(uintptr_t)zc.zc_nvlist_dst);
return (error);
}
+
+/*
+ * Roll back this filesystem or volume to its most recent snapshot.
+ * If snapnamebuf is not NULL, it will be filled in with the name
+ * of the most recent snapshot.
+ *
+ * Return 0 on success or an errno on failure.
+ */
+int
+lzc_rollback(const char *fsname, char *snapnamebuf, int snapnamelen)
+{
+ nvlist_t *args;
+ nvlist_t *result;
+ int err;
+
+ args = fnvlist_alloc();
+ err = lzc_ioctl(ZFS_IOC_ROLLBACK, fsname, args, &result);
+ nvlist_free(args);
+ if (err == 0 && snapnamebuf != NULL) {
+ const char *snapname = fnvlist_lookup_string(result, "target");
+ (void) strlcpy(snapnamebuf, snapname, snapnamelen);
+ }
+ return (err);
+}
typedef struct dsl_dataset_rollback_arg {
const char *ddra_fsname;
void *ddra_owner;
+ nvlist_t *ddra_result;
} dsl_dataset_rollback_arg_t;
static int
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dataset_t *ds, *clone;
uint64_t cloneobj;
+ char namebuf[ZFS_MAXNAMELEN];
VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds));
+ dsl_dataset_name(ds->ds_prev, namebuf);
+ fnvlist_add_string(ddra->ddra_result, "target", namebuf);
+
cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback",
ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx);
}
/*
- * If owner != NULL:
+ * Rolls back the given filesystem or volume to the most recent snapshot.
+ * The name of the most recent snapshot will be returned under key "target"
+ * in the result nvlist.
*
+ * If owner != NULL:
* - The existing dataset MUST be owned by the specified owner at entry
* - Upon return, dataset will still be held by the same owner, whether we
* succeed or not.
* notes above zfs_suspend_fs() for further details.
*/
int
-dsl_dataset_rollback(const char *fsname, void *owner)
+dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result)
{
dsl_dataset_rollback_arg_t ddra;
ddra.ddra_fsname = fsname;
ddra.ddra_owner = owner;
+ ddra.ddra_result = result;
return (dsl_sync_task(fsname, dsl_dataset_rollback_check,
- dsl_dataset_rollback_sync, (void *)&ddra, 1));
+ dsl_dataset_rollback_sync, &ddra, 1));
}
struct promotenode {
}
/*
- * inputs:
- * zc_name name of dataset to rollback (to most recent snapshot)
+ * fsname is name of dataset to rollback (to most recent snapshot)
*
- * outputs: none
+ * innvl is not used.
+ *
+ * outnvl: "target" -> name of most recent snapshot
+ * }
*/
+/* ARGSUSED */
static int
-zfs_ioc_rollback(zfs_cmd_t *zc)
+zfs_ioc_rollback(const char *fsname, nvlist_t *args, nvlist_t *outnvl)
{
zfs_sb_t *zsb;
int error;
- if (get_zfs_sb(zc->zc_name, &zsb) == 0) {
+ if (get_zfs_sb(fsname, &zsb) == 0) {
error = zfs_suspend_fs(zsb);
if (error == 0) {
int resume_err;
- error = dsl_dataset_rollback(zc->zc_name, zsb);
- resume_err = zfs_resume_fs(zsb, zc->zc_name);
+ error = dsl_dataset_rollback(fsname, zsb, outnvl);
+ resume_err = zfs_resume_fs(zsb, fsname);
error = error ? error : resume_err;
}
deactivate_super(zsb->z_sb);
} else {
- error = dsl_dataset_rollback(zc->zc_name, NULL);
+ error = dsl_dataset_rollback(fsname, NULL, outnvl);
}
return (error);
}
zfs_ioc_get_holds, zfs_secpolicy_read, DATASET_NAME,
POOL_CHECK_SUSPENDED, B_FALSE, B_FALSE);
+ zfs_ioctl_register("rollback", ZFS_IOC_ROLLBACK,
+ zfs_ioc_rollback, zfs_secpolicy_rollback, DATASET_NAME,
+ POOL_CHECK_SUSPENDED | POOL_CHECK_READONLY, B_FALSE, B_TRUE);
+
/* IOCTLS that use the legacy function signature */
zfs_ioctl_register_legacy(ZFS_IOC_POOL_FREEZE, zfs_ioc_pool_freeze,
zfs_secpolicy_none);
zfs_ioctl_register_dataset_modify(ZFS_IOC_DESTROY, zfs_ioc_destroy,
zfs_secpolicy_destroy);
- zfs_ioctl_register_dataset_modify(ZFS_IOC_ROLLBACK, zfs_ioc_rollback,
- zfs_secpolicy_rollback);
zfs_ioctl_register_dataset_modify(ZFS_IOC_RENAME, zfs_ioc_rename,
zfs_secpolicy_rename);
zfs_ioctl_register_dataset_modify(ZFS_IOC_RECV, zfs_ioc_recv,
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