btrfs: Open code btrfs_write_and_wait_marked_extents

btrfs_write_and_wait_transaction is essentially a wrapper of
btrfs_write_and_wait_marked_extents with the addition of calling
clear_btree_io_tree. Having the code split doesn't really bring any
benefit. Open code the later into the former and add proper
documentation header.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ reformat comment ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index beca256..03fbb88 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1083,40 +1083,33 @@ int btrfs_wait_tree_log_extents(struct btrfs_root *log_root, int mark)
 }
 
 /*
- * when btree blocks are allocated, they have some corresponding bits set for
- * them in one of two extent_io trees.  This is used to make sure all of
- * those extents are on disk for transaction or log commit
+ * When btree blocks are allocated the corresponding extents are marked dirty.
+ * This function ensures such extents are persisted on disk for transaction or
+ * log commit.
+ *
+ * @trans: transaction whose dirty pages we'd like to write
  */
-static int btrfs_write_and_wait_marked_extents(struct btrfs_fs_info *fs_info,
-                               struct extent_io_tree *dirty_pages, int mark)
+static int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
+                                           struct btrfs_fs_info *fs_info)
 {
        int ret;
        int ret2;
+       struct extent_io_tree *dirty_pages = &trans->transaction->dirty_pages;
        struct blk_plug plug;
 
        blk_start_plug(&plug);
-       ret = btrfs_write_marked_extents(fs_info, dirty_pages, mark);
+       ret = btrfs_write_marked_extents(fs_info, dirty_pages, EXTENT_DIRTY);
        blk_finish_plug(&plug);
        ret2 = btrfs_wait_extents(fs_info, dirty_pages);
 
+       clear_btree_io_tree(&trans->transaction->dirty_pages);
+
        if (ret)
                return ret;
-       if (ret2)
+       else if (ret2)
                return ret2;
-       return 0;
-}
-
-static int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
-                                           struct btrfs_fs_info *fs_info)
-{
-       int ret;
-
-       ret = btrfs_write_and_wait_marked_extents(fs_info,
-                                          &trans->transaction->dirty_pages,
-                                          EXTENT_DIRTY);
-       clear_btree_io_tree(&trans->transaction->dirty_pages);
-
-       return ret;
+       else
+               return 0;
 }
 
 /*