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authorZheng Yan <zheng.yan@oracle.com>2008-09-26 10:04:53 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-26 10:04:53 -0400
commite465768938f95388723b0fd3c50a0ae48173edb9 (patch)
tree0f624a9a98dedfafae902e12b384d27e1100cd3a /fs/btrfs/ref-cache.h
parente8569813849b5da394a195c7e76b4faa452b12d1 (diff)
downloadlinux-e465768938f95388723b0fd3c50a0ae48173edb9.tar.bz2
Btrfs: Add shared reference cache
Btrfs has a cache of reference counts in leaves, allowing it to avoid reading tree leaves while deleting snapshots. To reduce contention with multiple subvolumes, this cache is private to each subvolume. This patch adds shared reference cache support. The new space balancing code plays with multiple subvols at the same time, So the old per-subvol reference cache is not well suited. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ref-cache.h')
-rw-r--r--fs/btrfs/ref-cache.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/btrfs/ref-cache.h b/fs/btrfs/ref-cache.h
index c361b321c0c3..617564787f52 100644
--- a/fs/btrfs/ref-cache.h
+++ b/fs/btrfs/ref-cache.h
@@ -27,6 +27,7 @@ struct btrfs_extent_info {
struct btrfs_leaf_ref {
struct rb_node rb_node;
+ struct btrfs_leaf_ref_tree *tree;
int in_tree;
atomic_t usage;
@@ -64,8 +65,10 @@ struct btrfs_leaf_ref *btrfs_alloc_leaf_ref(struct btrfs_root *root,
void btrfs_free_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
struct btrfs_leaf_ref *btrfs_lookup_leaf_ref(struct btrfs_root *root,
u64 bytenr);
-int btrfs_add_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
-int btrfs_remove_leaf_refs(struct btrfs_root *root, u64 max_root_gen);
+int btrfs_add_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref,
+ int shared);
+int btrfs_remove_leaf_refs(struct btrfs_root *root, u64 max_root_gen,
+ int shared);
int btrfs_remove_leaf_ref(struct btrfs_root *root, struct btrfs_leaf_ref *ref);
#endif