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>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index f5fbe57..71549d1 100644 (file)
--- 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:

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 81376d9..360c2df 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -467,19 +467,12 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
 
        btrfs_trans_release_metadata(trans, root);
        trans->block_rsv = NULL;
-       while (count < 4) {
+       while (count < 2) {
                unsigned long cur = trans->delayed_ref_updates;
                trans->delayed_ref_updates = 0;
                if (cur &&
                    trans->transaction->delayed_refs.num_heads_ready > 64) {
                        trans->delayed_ref_updates = 0;
-
-                       /*
-                        * do a full flush if the transaction is trying
-                        * to close
-                        */
-                       if (trans->transaction->delayed_refs.flushing)
-                               cur = 0;
                        btrfs_run_delayed_refs(trans, root, cur);
                } else {
                        break;