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btrfs-progs: Introduce change_devices_uuid function. 

This function will change all device items' fsid.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Qu Wenruo 2015-05-11 16:08:50 +08:00 committed by David Sterba
parent cff8aa2313
commit 01cdf01ecf
1 changed files with 43 additions and 0 deletions
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43
btrfstune.c
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@ -219,6 +219,49 @@ static int change_device_uuid(struct btrfs_root *root, struct extent_buffer *eb,
return ret;
}
static int change_devices_uuid(struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root = fs_info->chunk_root;
struct btrfs_path *path;
struct btrfs_key key = {0, 0, 0};
int ret = 0;
/*
* Unlike change_extents_uuid, we only need to change fsid in dev_item
*/
if (!fs_info->new_fsid)
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
/* No transaction again */
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
while (1) {
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
if (key.type != BTRFS_DEV_ITEM_KEY ||
key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
goto next;
ret = change_device_uuid(root, path->nodes[0], path->slots[0]);
if (ret < 0)
goto out;
next:
ret = btrfs_next_item(root, path);
if (ret < 0)
goto out;
if (ret > 0) {
ret = 0;
goto out;
}
}
out:
btrfs_free_path(path);
return ret;
}
static void print_usage(void)
{
fprintf(stderr, "usage: btrfstune [options] device\n");