Btrfs: do not try and lookup the file extent when finishing ordered io

[karo-tx-linux.git] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a6d79c7731e8c58720931e53a4c8dc3a7bf93b1c..8fa67e09630509edb476e295e3bf2df85c0cd1cc 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1680,24 +1680,6 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans,
  * before we start the transaction.  It limits the amount of btree
  * reads required while inside the transaction.
  */
-static noinline void reada_csum(struct btrfs_root *root,
-                               struct btrfs_path *path,
-                               struct btrfs_ordered_extent *ordered_extent)
-{
-       struct btrfs_ordered_sum *sum;
-       u64 bytenr;
-
-       sum = list_entry(ordered_extent->list.next, struct btrfs_ordered_sum,
-                        list);
-       bytenr = sum->sums[0].bytenr;
-
-       /*
-        * we don't care about the results, the point of this search is
-        * just to get the btree leaves into ram
-        */
-       btrfs_lookup_csum(NULL, root->fs_info->csum_root, path, bytenr, 0);
-}
-
 /* as ordered data IO finishes, this gets called so we can finish
  * an ordered extent if the range of bytes in the file it covers are
  * fully written.
@@ -1708,7 +1690,6 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
        struct btrfs_trans_handle *trans;
        struct btrfs_ordered_extent *ordered_extent = NULL;
        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
-       struct btrfs_path *path;
        int compressed = 0;
        int ret;
 
@@ -1716,32 +1697,9 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
        if (!ret)
                return 0;
 
-       /*
-        * before we join the transaction, try to do some of our IO.
-        * This will limit the amount of IO that we have to do with
-        * the transaction running.  We're unlikely to need to do any
-        * IO if the file extents are new, the disk_i_size checks
-        * covers the most common case.
-        */
-       if (start < BTRFS_I(inode)->disk_i_size) {
-               path = btrfs_alloc_path();
-               if (path) {
-                       ret = btrfs_lookup_file_extent(NULL, root, path,
-                                                      inode->i_ino,
-                                                      start, 0);
-                       ordered_extent = btrfs_lookup_ordered_extent(inode,
-                                                                    start);
-                       if (!list_empty(&ordered_extent->list)) {
-                               btrfs_release_path(root, path);
-                               reada_csum(root, path, ordered_extent);
-                       }
-                       btrfs_free_path(path);
-               }
-       }
-
-       if (!ordered_extent)
-               ordered_extent = btrfs_lookup_ordered_extent(inode, start);
+       ordered_extent = btrfs_lookup_ordered_extent(inode, start);
        BUG_ON(!ordered_extent);
+
        if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) {
                BUG_ON(!list_empty(&ordered_extent->list));
                ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent);