From cff8aa2313c48788b55d6559e107b5726dcb1217 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Mon, 11 May 2015 16:08:49 +0800 Subject: [PATCH] btrfs-progs: Introduce change_device_uuid function This function changes a device items uuid. Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- btrfstune.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/btrfstune.c b/btrfstune.c index b8900113..4ccd6d4c 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");