Btrfs: remove the unnecessary flush when preparing the pages

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>

1 files changed, 5 insertions, 8 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 006cf9f0e852..b2143b8c33c5 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1360,11 +1360,11 @@ lock_and_cleanup_extent_if_need(struct inode *inode, struct page **pages,
                 struct btrfs_ordered_extent *ordered;
                 lock_extent_bits(&BTRFS_I(inode)->io_tree,
                                  start_pos, last_pos, 0, cached_state);
-                ordered = btrfs_lookup_first_ordered_extent(inode, last_pos);
+                ordered = btrfs_lookup_ordered_range(inode, start_pos,
+                                                     last_pos - start_pos + 1);
                 if (ordered &&
                     ordered->file_offset + ordered->len > start_pos &&
                     ordered->file_offset <= last_pos) {
-                        btrfs_put_ordered_extent(ordered);
                         unlock_extent_cached(&BTRFS_I(inode)->io_tree,
                                              start_pos, last_pos,
                                              cached_state, GFP_NOFS);
@@ -1372,12 +1372,9 @@ lock_and_cleanup_extent_if_need(struct inode *inode, struct page **pages,
                                 unlock_page(pages[i]);
                                 page_cache_release(pages[i]);
                         }
-                        ret = btrfs_wait_ordered_range(inode, start_pos,
-                                                last_pos - start_pos + 1);
-                        if (ret)
-                                return ret;
-                        else
-                                return -EAGAIN;
+                        btrfs_start_ordered_extent(inode, ordered, 1);
+                        btrfs_put_ordered_extent(ordered);
+                        return -EAGAIN;
                 }
                 if (ordered)
                         btrfs_put_ordered_extent(ordered);