From patchwork Fri Jun 3 05:37:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12868557 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 58B3AEBB for ; Fri, 3 Jun 2022 05:38:03 +0000 (UTC) IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:rEtrYq7CpTBYfigboQPXwCzXdLJyesId70hD6qhwISY6TiX+rbHJoB17726MtN9/YhEdcLy7VJVoBEmskKKdgrNhWotKPjOW21dARbsKheCJrgEIWReOktK1vp0AT0ERMrLN5CBB/KTHCReDYqsd6ejC4Ka1nv3f0nsoaQlrbptr5wB/Bh3zKDwMeCB2QYo+CIGH5tdK4x6peXEsZMy9AXUfG8fZodmjruOdXTc2Qw4g9BKVjS6lrJrzEx2j1B8YVD9VhZcOmFK16zDE2g== X-IronPort-AV: E=Sophos;i="5.88,333,1635177600"; d="scan'208";a="124686815" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 03 Jun 2022 13:37:57 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id EE6884D17199; Fri, 3 Jun 2022 13:37:52 +0800 (CST) Received: from G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Fri, 3 Jun 2022 13:37:53 +0800 Received: from irides.mr.mr (10.167.225.141) by G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Fri, 3 Jun 2022 13:37:52 +0800 From: Shiyang Ruan To: , , , , CC: , , , , , , , , , , , Christoph Hellwig Subject: [PATCH v2 14/14] xfs: Add dax dedupe support Date: Fri, 3 Jun 2022 13:37:38 +0800 Message-ID: <20220603053738.1218681-15-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220603053738.1218681-1-ruansy.fnst@fujitsu.com> References: <20220603053738.1218681-1-ruansy.fnst@fujitsu.com> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-yoursite-MailScanner-ID: EE6884D17199.A0B2C X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Spam-Status: No Introduce xfs_mmaplock_two_inodes_and_break_dax_layout() for dax files who are going to be deduped. After that, call compare range function only when files are both DAX or not. Signed-off-by: Shiyang Ruan Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_file.c | 2 +- fs/xfs/xfs_inode.c | 69 +++++++++++++++++++++++++++++++++++++++++--- fs/xfs/xfs_inode.h | 1 + fs/xfs/xfs_reflink.c | 4 +-- 4 files changed, 69 insertions(+), 7 deletions(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 07ec4ada5163..9f433006edcd 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -808,7 +808,7 @@ xfs_wait_dax_page( xfs_ilock(ip, XFS_MMAPLOCK_EXCL); } -static int +int xfs_break_dax_layouts( struct inode *inode, bool *retry) diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index b2879870a17e..96308065a2b3 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -3767,6 +3767,50 @@ xfs_iolock_two_inodes_and_break_layout( return 0; } +static int +xfs_mmaplock_two_inodes_and_break_dax_layout( + struct xfs_inode *ip1, + struct xfs_inode *ip2) +{ + int error; + bool retry; + struct page *page; + + if (ip1->i_ino > ip2->i_ino) + swap(ip1, ip2); + +again: + retry = false; + /* Lock the first inode */ + xfs_ilock(ip1, XFS_MMAPLOCK_EXCL); + error = xfs_break_dax_layouts(VFS_I(ip1), &retry); + if (error || retry) { + xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL); + if (error == 0 && retry) + goto again; + return error; + } + + if (ip1 == ip2) + return 0; + + /* Nested lock the second inode */ + xfs_ilock(ip2, xfs_lock_inumorder(XFS_MMAPLOCK_EXCL, 1)); + /* + * We cannot use xfs_break_dax_layouts() directly here because it may + * need to unlock & lock the XFS_MMAPLOCK_EXCL which is not suitable + * for this nested lock case. + */ + page = dax_layout_busy_page(VFS_I(ip2)->i_mapping); + if (page && page_ref_count(page) != 1) { + xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL); + xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL); + goto again; + } + + return 0; +} + /* * Lock two inodes so that userspace cannot initiate I/O via file syscalls or * mmap activity. @@ -3781,8 +3825,19 @@ xfs_ilock2_io_mmap( ret = xfs_iolock_two_inodes_and_break_layout(VFS_I(ip1), VFS_I(ip2)); if (ret) return ret; - filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping, - VFS_I(ip2)->i_mapping); + + if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) { + ret = xfs_mmaplock_two_inodes_and_break_dax_layout(ip1, ip2); + if (ret) { + inode_unlock(VFS_I(ip2)); + if (ip1 != ip2) + inode_unlock(VFS_I(ip1)); + return ret; + } + } else + filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping, + VFS_I(ip2)->i_mapping); + return 0; } @@ -3792,8 +3847,14 @@ xfs_iunlock2_io_mmap( struct xfs_inode *ip1, struct xfs_inode *ip2) { - filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping, - VFS_I(ip2)->i_mapping); + if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) { + xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL); + if (ip1 != ip2) + xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL); + } else + filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping, + VFS_I(ip2)->i_mapping); + inode_unlock(VFS_I(ip2)); if (ip1 != ip2) inode_unlock(VFS_I(ip1)); diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 7be6f8e705ab..8313cc83b6ee 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -467,6 +467,7 @@ xfs_itruncate_extents( } /* from xfs_file.c */ +int xfs_break_dax_layouts(struct inode *inode, bool *retry); int xfs_break_layouts(struct inode *inode, uint *iolock, enum layout_break_reason reason); diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index cbaf36d21020..d07f06ff0f13 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1363,8 +1363,8 @@ xfs_reflink_remap_prep( if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest)) goto out_unlock; - /* Don't share DAX file data for now. */ - if (IS_DAX(inode_in) || IS_DAX(inode_out)) + /* Don't share DAX file data with non-DAX file. */ + if (IS_DAX(inode_in) != IS_DAX(inode_out)) goto out_unlock; if (!IS_DAX(inode_in))