From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id 444117F50 for ; Tue, 24 Mar 2015 05:51:23 -0500 (CDT) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay2.corp.sgi.com (Postfix) with ESMTP id 2F04E304032 for ; Tue, 24 Mar 2015 03:51:19 -0700 (PDT) Received: from ipmail04.adl6.internode.on.net (ipmail04.adl6.internode.on.net [150.101.137.141]) by cuda.sgi.com with ESMTP id 7WasVupsolokMhZw for ; Tue, 24 Mar 2015 03:51:16 -0700 (PDT) From: Dave Chinner Subject: [PATCH 4/8] xfs: add DAX block zeroing support Date: Tue, 24 Mar 2015 21:51:02 +1100 Message-Id: <1427194266-2885-5-git-send-email-david@fromorbit.com> In-Reply-To: <1427194266-2885-1-git-send-email-david@fromorbit.com> References: <1427194266-2885-1-git-send-email-david@fromorbit.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com Cc: linux-fsdevel@vger.kernel.org, willy@linux.intel.com, jack@suse.cz From: Dave Chinner Add initial support for DAX block zeroing operations to XFS. DAX cannot use buffered IO through the page cache for zeroing, nor do we need to issue IO for uncached block zeroing. In both cases, we can simply call out to the dax block zeroing function. Signed-off-by: Dave Chinner --- fs/xfs/xfs_bmap_util.c | 23 +++++++++++++++++++---- fs/xfs/xfs_file.c | 28 +++++++++++++++++----------- 2 files changed, 36 insertions(+), 15 deletions(-) diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 1bd5393..d1fe432 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1133,14 +1133,29 @@ xfs_zero_remaining_bytes( break; ASSERT(imap.br_blockcount >= 1); ASSERT(imap.br_startoff == offset_fsb); + ASSERT(imap.br_startblock != DELAYSTARTBLOCK); + + if (imap.br_startblock == HOLESTARTBLOCK || + imap.br_state == XFS_EXT_UNWRITTEN) { + /* skip the entire extent */ + lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + + imap.br_blockcount) - 1; + continue; + } + lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; if (lastoffset > endoff) lastoffset = endoff; - if (imap.br_startblock == HOLESTARTBLOCK) - continue; - ASSERT(imap.br_startblock != DELAYSTARTBLOCK); - if (imap.br_state == XFS_EXT_UNWRITTEN) + + /* DAX can just zero the backing device directly */ + if (IS_DAX(VFS_I(ip))) { + error = dax_zero_page_range(VFS_I(ip), offset, + lastoffset - offset + 1, + xfs_get_blocks_dax); + if (error) + return error; continue; + } error = xfs_buf_read_uncached(XFS_IS_REALTIME_INODE(ip) ? mp->m_rtdev_targp : mp->m_ddev_targp, diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index a4c882e..94713c2 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -97,7 +97,8 @@ xfs_iozero( { struct page *page; struct address_space *mapping; - int status; + int status = 0; + mapping = VFS_I(ip)->i_mapping; do { @@ -109,20 +110,25 @@ xfs_iozero( if (bytes > count) bytes = count; - status = pagecache_write_begin(NULL, mapping, pos, bytes, - AOP_FLAG_UNINTERRUPTIBLE, - &page, &fsdata); - if (status) - break; + if (IS_DAX(VFS_I(ip))) + dax_zero_page_range(VFS_I(ip), pos, bytes, + xfs_get_blocks_dax); + else { + status = pagecache_write_begin(NULL, mapping, pos, bytes, + AOP_FLAG_UNINTERRUPTIBLE, + &page, &fsdata); + if (status) + break; - zero_user(page, offset, bytes); + zero_user(page, offset, bytes); - status = pagecache_write_end(NULL, mapping, pos, bytes, bytes, - page, fsdata); - WARN_ON(status <= 0); /* can't return less than zero! */ + status = pagecache_write_end(NULL, mapping, pos, bytes, + bytes, page, fsdata); + WARN_ON(status <= 0); /* can't return less than zero! */ + status = 0; + } pos += bytes; count -= bytes; - status = 0; } while (count); return (-status); -- 2.0.0 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs