From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ross Zwisler Subject: Re: [PATCH v6 20/22] ext4: Add DAX functionality Date: Tue, 18 Mar 2014 12:45:29 -0600 (MDT) Message-ID: References: <1393337918-28265-1-git-send-email-matthew.r.wilcox@intel.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, willy@linux.intel.com, Ross Zwisler To: Matthew Wilcox Return-path: In-Reply-To: Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Tue, 25 Feb 2014, Matthew Wilcox wrote: > From: Ross Zwisler > > This is a port of the DAX functionality found in the current version of > ext2. > > Signed-off-by: Ross Zwisler > Reviewed-by: Andreas Dilger > [heavily tweaked] > Signed-off-by: Matthew Wilcox ... > diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c > index 594009f..dbdacef 100644 > --- a/fs/ext4/indirect.c > +++ b/fs/ext4/indirect.c > @@ -686,15 +686,22 @@ retry: > inode_dio_done(inode); > goto locked; > } > - ret = __blockdev_direct_IO(rw, iocb, inode, > - inode->i_sb->s_bdev, iov, > - offset, nr_segs, > - ext4_get_block, NULL, NULL, 0); > + if (IS_DAX(inode)) > + ret = dax_do_io(rw, iocb, inode, iov, offset, nr_segs, > + ext4_get_block, NULL, 0); > + else > + ret = __blockdev_direct_IO(rw, iocb, inode, > + inode->i_sb->s_bdev, iov, offset, > + nr_segs, ext4_get_block, NULL, NULL, 0); > inode_dio_done(inode); > } else { > locked: > - ret = blockdev_direct_IO(rw, iocb, inode, iov, > - offset, nr_segs, ext4_get_block); > + if (IS_DAX(inode)) > + ret = dax_do_io(rw, iocb, inode, iov, offset, nr_segs, > + ext4_get_block, NULL, 0); We need to pass in a DIO_LOCKING flag to this call to dax_do_io. This flag is provided correctly in ext2_direct_IO which is the only other place I found where we have a call to dax_do_io as an alternative to blockdev_direct_IO. The other calls to dax_do_io are alternatives to __blockdev_direct_IO, which has an explicit flags parameter. I believe all of these cases are being handled correctly. - Ross -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org