Btrfs: Online btree defragmentation fixes

The btree defragger wasn't making forward progress because the new key wasn't
being saved by the btrfs_search_forward function.

This also disables the automatic btree defrag, it wasn't scaling well to
huge filesystems.  The auto-defrag needs to be done differently.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ca8e6f15859e..a28796482b4a 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -609,6 +609,7 @@ struct btrfs_root {
         u64 last_inode_alloc;
         int ref_cows;
         int track_dirty;
+        u64 defrag_trans_start;
         struct btrfs_key defrag_progress;
         struct btrfs_key defrag_max;
         int defrag_running;
@@ -1412,7 +1413,11 @@ int btrfs_previous_item(struct btrfs_root *root,
 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
-                        struct btrfs_key *key, int lowest_level);
+                        struct btrfs_key *key, int lowest_level,
+                        int cache_only, u64 min_trans);
+int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
+                         struct btrfs_path *path, int cache_only,
+                         u64 min_trans);
 
 int btrfs_cow_block(struct btrfs_trans_handle *trans,
                     struct btrfs_root *root, struct extent_buffer *buf,