Btrfs: fix sync subvol/snapshot creation
We were incorrectly taking the async path even for the sync ioctls by
passing in &transid unconditionally.
There's ample room for further cleanup here, but this keeps the fix simple.
Signed-off-by: Sage Weil <sage@newdream.net>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index f1c9bb4..7cc2e8e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -964,6 +964,15 @@
name = async_vol_args->name;
fd = async_vol_args->fd;
async_vol_args->name[BTRFS_SNAPSHOT_NAME_MAX] = '\0';
+
+ ret = btrfs_ioctl_snap_create_transid(file, name, fd,
+ subvol, &transid);
+
+ if (ret == 0 &&
+ copy_to_user(arg +
+ offsetof(struct btrfs_ioctl_async_vol_args,
+ transid), &transid, sizeof(transid)))
+ ret = -EFAULT;
} else {
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args))
@@ -971,16 +980,9 @@
name = vol_args->name;
fd = vol_args->fd;
vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
- }
- ret = btrfs_ioctl_snap_create_transid(file, name, fd,
- subvol, &transid);
-
- if (!ret && async) {
- if (copy_to_user(arg +
- offsetof(struct btrfs_ioctl_async_vol_args,
- transid), &transid, sizeof(transid)))
- return -EFAULT;
+ ret = btrfs_ioctl_snap_create_transid(file, name, fd,
+ subvol, NULL);
}
kfree(vol_args);