Btrfs: run chunk allocations while we do delayed refs

Btrfs tries to batch extent allocation tree changes to improve performance
and reduce metadata trashing.  But it doesn't allocate new metadata chunks
while it is doing allocations for the extent allocation tree.

This commit changes the delayed refence code to do chunk allocations if we're
getting low on room.  It prevents crashes and improves performance.

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

1 files changed, 10 insertions, 4 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index f5fbe576d2ba..71549d11a09e 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2267,9 +2267,7 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
                                 BUG_ON(ret);
                                 kfree(extent_op);
 
-                                cond_resched();
-                                spin_lock(&delayed_refs->lock);
-                                continue;
+                                goto next;
                         }
 
                         list_del_init(&locked_ref->cluster);
@@ -2289,7 +2287,11 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
                 btrfs_put_delayed_ref(ref);
                 kfree(extent_op);
                 count++;
-
+next:
+                do_chunk_alloc(trans, root->fs_info->extent_root,
+                               2 * 1024 * 1024,
+                               btrfs_get_alloc_profile(root, 0),
+                               CHUNK_ALLOC_NO_FORCE);
                 cond_resched();
                 spin_lock(&delayed_refs->lock);
         }
@@ -2317,6 +2319,10 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
         if (root == root->fs_info->extent_root)
                 root = root->fs_info->tree_root;
 
+        do_chunk_alloc(trans, root->fs_info->extent_root,
+                       2 * 1024 * 1024, btrfs_get_alloc_profile(root, 0),
+                       CHUNK_ALLOC_NO_FORCE);
+
         delayed_refs = &trans->transaction->delayed_refs;
         INIT_LIST_HEAD(&cluster);
 again: