On Tue, 2014-07-29 at 09:49 -0700, Christoph Hellwig wrote:
> On Tue, Jul 29, 2014 at 09:35:02AM -0700, Tim Chen wrote:
> > On Tue, 2014-07-29 at 07:19 -0700, Christoph Hellwig wrote:
> > > Hi Tim,
> > >
> > > I think the problem is that sdio.size doesn't get set set with
> > > the new dio code. Please try the patch below to fix this by not
> > > relying on that field:
> >
> > Thanks for your quick response. We'll test this patch and let you
> > know the results.
>
> There actually was a little bug in it, please try the version below
> instead:
>
Christoph, we're glad to report that this patch does fix the problem.
Wonder if Al or someone can pick it up. It is a large regression
that should not be left unfixed for 3.16.
Tim
>
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index 194d0d1..17e39b0 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -71,7 +71,6 @@ struct dio_submit {
> been performed at the start of a
> write */
> int pages_in_io; /* approximate total IO pages */
> - size_t size; /* total request size (doesn't change)*/
> sector_t block_in_file; /* Current offset into the underlying
> file in dio_block units. */
> unsigned blocks_available; /* At block_in_file. changes */
> @@ -1104,7 +1103,8 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb,
> struct inode *inode,
> unsigned blkbits = i_blkbits;
> unsigned blocksize_mask = (1 << blkbits) - 1;
> ssize_t retval = -EINVAL;
> - loff_t end = offset + iov_iter_count(iter);
> + size_t count = iov_iter_count(iter);
> + loff_t end = offset + count;
> struct dio *dio;
> struct dio_submit sdio = { 0, };
> struct buffer_head map_bh = { 0, };
> @@ -1287,10 +1287,9 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb,
> struct inode *inode,
> */
> BUG_ON(retval == -EIOCBQUEUED);
> if (dio->is_async && retval == 0 && dio->result &&
> - ((rw == READ) || (dio->result == sdio.size)))
> + (rw == READ || dio->result == count))
> retval = -EIOCBQUEUED;
> -
> - if (retval != -EIOCBQUEUED)
> + else
> dio_await_completion(dio);
>
> if (drop_refcount(dio) == 0) {
> --
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