dont-allocate-io_end-for-writeback-from-ext4_writepage

   1 ext4: don't allocate io_end for writeback from ext4_writepage()
   2
   3 From: Jan Kara <jack@suse.cz>
   4
   5 ext4_writepage() writes out only mapped buffers with allocated
   6 underlying blocks. Thus there's no need for io_end structure
   7 and we can avoid allocating it.
   8
   9 Signed-off-by: Jan Kara <jack@suse.cz>
  10 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
  11 ---
  12  fs/ext4/inode.c | 8 --------
  13  1 file changed, 8 deletions(-)
  14
  15 diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
  16 index 4247d8d25687..baa87e7d1426 100644
  17 --- a/fs/ext4/inode.c
  18 +++ b/fs/ext4/inode.c
  19 @@ -2107,16 +2107,8 @@ static int ext4_writepage(struct page *page,
  20                 return __ext4_journalled_writepage(page, len);
  21
  22         ext4_io_submit_init(&io_submit, wbc);
  23 -       io_submit.io_end = ext4_init_io_end(inode, GFP_NOFS);
  24 -       if (!io_submit.io_end) {
  25 -               redirty_page_for_writepage(wbc, page);
  26 -               unlock_page(page);
  27 -               return -ENOMEM;
  28 -       }
  29         ret = ext4_bio_write_page(&io_submit, page, len, wbc, keep_towrite);
  30         ext4_io_submit(&io_submit);
  31 -       /* Drop io_end reference we got from init */
  32 -       ext4_put_io_end_defer(io_submit.io_end);
  33         return ret;
  34  }
  35
  36 --
  37 2.12.0
  38
  39