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authorChris Mason <chris.mason@oracle.com>2008-09-05 16:13:11 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:07 -0400
commite02119d5a7b4396c5a872582fddc8bd6d305a70a (patch)
tree825efe2a79dbca8d61256183f3526a5b5dc40dc6 /fs/btrfs/btrfs_inode.h
parenta1b32a5932cfac7c38b442582285f3da2a09dfd8 (diff)
downloadop-kernel-dev-e02119d5a7b4396c5a872582fddc8bd6d305a70a.zip
op-kernel-dev-e02119d5a7b4396c5a872582fddc8bd6d305a70a.tar.gz
Btrfs: Add a write ahead tree log to optimize synchronous operations
File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/btrfs_inode.h')
-rw-r--r--fs/btrfs/btrfs_inode.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 111f905..fcc8cf2 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -33,6 +33,7 @@ struct btrfs_inode {
struct extent_io_tree io_failure_tree;
struct mutex csum_mutex;
struct mutex extent_mutex;
+ struct mutex log_mutex;
struct inode vfs_inode;
struct btrfs_ordered_inode_tree ordered_tree;
@@ -44,10 +45,17 @@ struct btrfs_inode {
struct list_head delalloc_inodes;
+ /* full 64 bit generation number */
+ u64 generation;
+
/*
* transid of the trans_handle that last modified this inode
*/
u64 last_trans;
+ /*
+ * transid that last logged this inode
+ */
+ u64 logged_trans;
u64 delalloc_bytes;
u64 disk_i_size;
u32 flags;
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