diff mbox

[10/18] dax: Remove pointless writeback from dax_do_io()

Message ID 1461015341-20153-11-git-send-email-jack@suse.cz (mailing list archive)
State Accepted
Commit c3d98e39d5b3
Headers show

Commit Message

Jan Kara April 18, 2016, 9:35 p.m. UTC 
dax_do_io() is calling filemap_write_and_wait() if DIO_LOCKING flags is
set. Presumably this was copied over from direct IO code. However DAX
inodes have no pagecache pages to write so the call is pointless. Remove
it.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/dax.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

Comments

Ross Zwisler April 29, 2016, 7 p.m. UTC | #1 
On Mon, Apr 18, 2016 at 11:35:33PM +0200, Jan Kara wrote:
> dax_do_io() is calling filemap_write_and_wait() if DIO_LOCKING flags is
> set. Presumably this was copied over from direct IO code. However DAX
> inodes have no pagecache pages to write so the call is pointless. Remove
> it.
> 
> Signed-off-by: Jan Kara <jack@suse.cz>

Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
diff mbox

Patch

diff --git a/fs/dax.c b/fs/dax.c
index 7c0036dd1570..237581441bc1 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -268,15 +268,8 @@  ssize_t dax_do_io(struct kiocb *iocb, struct inode *inode,
 	memset(&bh, 0, sizeof(bh));
 	bh.b_bdev = inode->i_sb->s_bdev;
 
-	if ((flags & DIO_LOCKING) && iov_iter_rw(iter) == READ) {
-		struct address_space *mapping = inode->i_mapping;
+	if ((flags & DIO_LOCKING) && iov_iter_rw(iter) == READ)
 		inode_lock(inode);
-		retval = filemap_write_and_wait_range(mapping, pos, end - 1);
-		if (retval) {
-			inode_unlock(inode);
-			goto out;
-		}
-	}
 
 	/* Protects against truncate */
 	if (!(flags & DIO_SKIP_DIO_COUNT))
@@ -297,7 +290,6 @@  ssize_t dax_do_io(struct kiocb *iocb, struct inode *inode,
 
 	if (!(flags & DIO_SKIP_DIO_COUNT))
 		inode_dio_end(inode);
- out:
 	return retval;
 }
 EXPORT_SYMBOL_GPL(dax_do_io);