This function just change a device item's uuid.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
btrfstune.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/btrfstune.c b/btrfstune.c
index 9c1b7aa..6706cd7 100644
--- a/btrfstune.c
+++ b/btrfstune.c
@@ -198,6 +198,27 @@ out:
return ret;
}
+static int change_device_uuid(struct btrfs_root *root, struct extent_buffer *eb,
+ int slot)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_dev_item *di;
+ int ret = 0;
+
+ di = btrfs_item_ptr(eb, slot, struct btrfs_dev_item);
+ if (fs_info->new_fsid) {
+ if (!memcmp_extent_buffer(eb, fs_info->new_fsid,
+ (unsigned long)btrfs_device_fsid(di),
+ BTRFS_FSID_SIZE))
+ return ret;
+ write_extent_buffer(eb, fs_info->new_fsid,
+ (unsigned long)btrfs_device_fsid(di),
+ BTRFS_FSID_SIZE);
+ ret = write_tree_block(NULL, root, eb);
+ }
+ return ret;
+}
+
static void print_usage(void)
{
fprintf(stderr, "usage: btrfstune [options] device\n");
--
2.3.7
--
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