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authorChris Mason <chris.mason@oracle.com>2008-07-28 15:32:51 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:05 -0400
commit017e5369eb353559d68a11d4a718faa634533821 (patch)
treec339f2f4a59e403c7f9bfa8d137663c6bf260537 /fs/btrfs/disk-io.c
parent31153d81284934601d08110ac7698fd9a535e4c0 (diff)
Btrfs: Leaf reference cache update
This changes the reference cache to make a single cache per root instead of one cache per transaction, and to key by the byte number of the disk block instead of the keys inside. This makes it much less likely to have cache misses if a snapshot or something has an extra reference on a higher node or a leaf while the first transaction that added the leaf into the cache is dropping. Some throttling is added to functions that free blocks heavily so they wait for old transactions to drop. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4f0e1d06c38..eccdf13a95a 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -40,6 +40,7 @@
#include "print-tree.h"
#include "async-thread.h"
#include "locking.h"
+#include "ref-cache.h"
#if 0
static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
@@ -737,6 +738,10 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
spin_lock_init(&root->node_lock);
spin_lock_init(&root->orphan_lock);
mutex_init(&root->objectid_mutex);
+
+ btrfs_leaf_ref_tree_init(&root->ref_tree_struct);
+ root->ref_tree = &root->ref_tree_struct;
+
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
@@ -1176,9 +1181,6 @@ static int transaction_kthread(void *arg)
goto sleep;
}
- printk("btrfs: running reference cache size %Lu\n",
- root->fs_info->running_ref_cache_size);
-
now = get_seconds();
if (now < cur->start_time || now - cur->start_time < 30) {
mutex_unlock(&root->fs_info->trans_mutex);