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Btrfs: introduce uuid-tree-gen field

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In order to be able to detect the case that a filesystem is mounted
with an old kernel, add a uuid-tree-gen field like the free space
cache is doing it. It is part of the super block and written with
each commit. Old kernels do not know this field and don't update it.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Stefan Behrens
2013-08-15 17:11:22 +02:00
committed by Chris Mason
parent 803b2f54fb
commit 26432799c9
2 changed files with 5 additions and 1 deletions
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fs/btrfs/transaction.c
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@@ -1380,6 +1380,7 @@ static void update_super_roots(struct btrfs_root *root)
super->root_level = root_item->level;
if (btrfs_test_opt(root, SPACE_CACHE))
super->cache_generation = root_item->generation;
super->uuid_tree_generation = root_item->generation;
}
int btrfs_transaction_in_commit(struct btrfs_fs_info *info)