From 0af3d00bad38d3bb9912a60928ad0669f17bdb76 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 21 Jun 2010 14:48:16 -0400 Subject: Btrfs: create special free space cache inode In order to save free space cache, we need an inode to hold the data, and we need a special item to point at the right inode for the right block group. So first, create a special item that will point to the right inode, and the number of extent entries we will have and the number of bitmaps we will have. We truncate and pre-allocate space everytime to make sure it's uptodate. This feature will be turned on as soon as you mount with -o space_cache, however it is safe to boot into old kernels, they will just generate the cache the old fashion way. When you boot back into a newer kernel we will notice that we modified and not the cache and automatically discard the cache. Signed-off-by: Josef Bacik --- fs/btrfs/transaction.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/btrfs/transaction.h') diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h index e104986d0bfd..15f83e1c1ef7 100644 --- a/fs/btrfs/transaction.h +++ b/fs/btrfs/transaction.h @@ -87,10 +87,14 @@ static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, int btrfs_end_transaction(struct btrfs_trans_handle *trans, struct btrfs_root *root); +int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans, + struct btrfs_root *root); struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, int num_items); struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root, int num_blocks); +struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root, + int num_blocks); struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r, int num_blocks); int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, -- cgit v1.2.2