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authorYan <zheng.yan@oracle.com>2008-07-30 16:29:20 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:05 -0400
commitbcc63abbf3e9bf948a1b0129b3e6120ec7d7f698 (patch)
tree1c66dc210f948f79c86786368d2c75b57482875d /fs/btrfs/ctree.h
parent33958dc6d38fb4ca7e62273855fcb2db7e616263 (diff)
Btrfs: implement memory reclaim for leaf reference cache
The memory reclaiming issue happens when snapshot exists. In that case, some cache entries may not be used during old snapshot dropping, so they will remain in the cache until umount. The patch adds a field to struct btrfs_leaf_ref to record create time. Besides, the patch makes all dead roots of a given snapshot linked together in order of create time. After a old snapshot was completely dropped, we check the dead root list and remove all cache entries created before the oldest dead root in the list. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
-rw-r--r--fs/btrfs/ctree.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 83422088c62..be16cd49ef6 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -666,7 +666,8 @@ struct btrfs_root {
/* the dirty list is only used by non-reference counted roots */
struct list_head dirty_list;
- spinlock_t orphan_lock;
+ spinlock_t list_lock;
+ struct list_head dead_list;
struct list_head orphan_list;
};