diff mbox

[v2,1/2] direct-io: cleanup get_more_blocks()

Message ID x49y47h6cg2.fsf@segfault.boston.devel.redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jeff Moyer May 10, 2016, 5:38 p.m. UTC 
Eryu Guan <guaneryu@gmail.com> writes:

> Save one level of indention by returning error early.
>
> Introduce some local variables to make the code easier to read a bit,
> and do preparation for next patch.
>
> Signed-off-by: Eryu Guan <guaneryu@gmail.com>

Hi, Eryu,

I don't think you have a full appreciation of the amount of optimization
that goes into this code.  I don't see anything wrong with what you've
done, but I also don't want to introduce all these local variables and
change a branch in order to find out several months down the line that
we introduced some TPC-C regression of .5%.

Look, I think this is all you need for the full fix:

 
Can you just test that?

Thanks,
Jeff
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 4720377..f66754e 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -639,8 +639,7 @@  static int get_more_blocks(struct dio *dio, struct dio_submit *sdio,
 		 */
 		create = dio->rw & WRITE;
 		if (dio->flags & DIO_SKIP_HOLES) {
-			if (sdio->block_in_file < (i_size_read(dio->inode) >>
-							sdio->blkbits))
+			if (fs_startblk < fs_count)
 				create = 0;
 		}