OpenZFS 8264 - want support for promoting datasets in libzfs_core

[mirror_zfs.git] / lib / libzfs_core / libzfs_core.c

diff --git a/lib/libzfs_core/libzfs_core.c b/lib/libzfs_core/libzfs_core.c
index 8e36d84598155228c3c2c564a3452e7e0210d999..8142f2c632a55bf040783e66c3500c5c43f508c4 100644 (file)
--- a/lib/libzfs_core/libzfs_core.c
+++ b/lib/libzfs_core/libzfs_core.c
@@ -23,6 +23,7 @@
  * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  * Copyright (c) 2017 Datto Inc.
+ * Copyright 2017 RackTop Systems.
  */
 
 /*
@@ -206,6 +207,28 @@ lzc_clone(const char *fsname, const char *origin,
        return (error);
 }
 
+int
+lzc_promote(const char *fsname, char *snapnamebuf, int snapnamelen)
+{
+       /*
+        * The promote ioctl is still legacy, so we need to construct our
+        * own zfs_cmd_t rather than using lzc_ioctl().
+        */
+       zfs_cmd_t zc = { "\0" };
+
+       ASSERT3S(g_refcount, >, 0);
+       VERIFY3S(g_fd, !=, -1);
+
+       (void) strlcpy(zc.zc_name, fsname, sizeof (zc.zc_name));
+       if (ioctl(g_fd, ZFS_IOC_PROMOTE, &zc) != 0) {
+               int error = errno;
+               if (error == EEXIST && snapnamebuf != NULL)
+                       (void) strlcpy(snapnamebuf, zc.zc_string, snapnamelen);
+               return (error);
+       }
+       return (0);
+}
+
 /*
  * Creates snapshots.
  *
@@ -333,7 +356,7 @@ lzc_exists(const char *dataset)
 {
        /*
         * The objset_stats ioctl is still legacy, so we need to construct our
-        * own zfs_cmd_t rather than using zfsc_ioctl().
+        * own zfs_cmd_t rather than using lzc_ioctl().
         */
        zfs_cmd_t zc = {"\0"};