Btrfs: don't set and clear delalloc for O_DIRECT writes

We do this to get the space accounting, but this is just needless churn on the
io_tree, so just drop setting/clearing delalloc and just drop the reserved data
space when we have a successfull allocation.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5a5b902e647f..3b957921ba59 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7160,7 +7160,7 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
         int ret = 0;
 
         if (create)
-                unlock_bits |= EXTENT_DELALLOC | EXTENT_DIRTY;
+                unlock_bits |= EXTENT_DIRTY;
         else
                 len = min_t(u64, len, root->sectorsize);
 
@@ -7296,11 +7296,7 @@ unlock:
                         BTRFS_I(inode)->outstanding_extents++;
                         spin_unlock(&BTRFS_I(inode)->lock);
                 }
-
-                ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart,
-                                     lockstart + len - 1, EXTENT_DELALLOC, NULL,
-                                     &cached_state, GFP_NOFS);
-                BUG_ON(ret);
+                btrfs_free_reserved_data_space(inode, len);
         }
 
         /*