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Btrfs: set UUID in root_item for created trees

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It is a rare exception that a new tree is created, like the qgroups
tree. So far these new trees have an all-zero UUID in their root
items. All trees that mkfs.btrfs has created get an UUID during the
first mount when btrfs_read_root_item() rewrites the root_item to
the v2 structure style. These UUID are never used so far, but
anyway, since it is better to have it uniform for all trees, this
commit adds some lines that generate and write an UUID for newly
created trees.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Stefan Behrens 2013-04-19 15:08:05 +00:00 committed by Josef Bacik
parent 5fbf83c10c
commit 6463fe58ea
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/disk-io.c
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@ -30,6 +30,7 @@
#include <linux/slab.h>
#include <linux/migrate.h>
#include <linux/ratelimit.h>
#include <linux/uuid.h>
#include <asm/unaligned.h>
#include "compat.h"
#include "ctree.h"
@ -1280,6 +1281,7 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
struct btrfs_key key;
int ret = 0;
u64 bytenr;
uuid_le uuid;
root = btrfs_alloc_root(fs_info);
if (!root)
@ -1329,6 +1331,8 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
btrfs_set_root_used(&root->root_item, leaf->len);
btrfs_set_root_last_snapshot(&root->root_item, 0);
btrfs_set_root_dirid(&root->root_item, 0);
uuid_le_gen(&uuid);
memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
root->root_item.drop_level = 0;
key.objectid = objectid;