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 <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 7bea4d2..99aa9b7 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -420,6 +420,7 @@ again:
        /* 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 @@ again:
                        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;