From 52ee28d249571616c80df7562bd4412ac253899a Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Thu, 11 Jul 2013 17:51:15 +0800 Subject: [PATCH] Btrfs: make free space caching faster with many non-inline extent references So to cache free space, we iterate every extent item to gather free space info. When we have say 10,000 non-inline extent refs(such as BTRFS_EXTENT_DATA_REF), it takes quite a long time, and since inline extent refs and non-inline ones have same objectid in their keys, we can just re-search the tree with the next address to skip non-inline references. (This is found by dedup feature because dedup extents can end up with many non-inline extent refs.) Signed-off-by: Liu Bo Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 7bea4d2f85dc..99aa9b77e948 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -420,6 +420,7 @@ static noinline void caching_thread(struct btrfs_work *work) /* need to make sure the commit_root doesn't disappear */ down_read(&fs_info->extent_commit_sem); +next: ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); if (ret < 0) goto err; @@ -459,6 +460,16 @@ static noinline void caching_thread(struct btrfs_work *work) continue; } + if (key.objectid < last) { + key.objectid = last; + key.offset = 0; + key.type = BTRFS_EXTENT_ITEM_KEY; + + caching_ctl->progress = last; + btrfs_release_path(path); + goto next; + } + if (key.objectid < block_group->key.objectid) { path->slots[0]++; continue; -- GitLab