From: Ross Zwisler Subject: [PATCH v3 7/7] xfs: call dax_pfn_mkwrite() for DAX fsync/msync Date: Tue, 8 Dec 2015 12:18:45 -0700 Message-ID: <1449602325-20572-8-git-send-email-ross.zwisler@linux.intel.com> References: <1449602325-20572-1-git-send-email-ross.zwisler@linux.intel.com> Cc: Ross Zwisler , "H. Peter Anvin" , "J. Bruce Fields" , "Theodore Ts'o" , Alexander Viro , Andreas Dilger , Dave Chinner , Ingo Molnar , Jan Kara , Jeff Layton , Matthew Wilcox , Thomas Gleixner , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, x86@kernel.org, xfs@oss.sgi.com, Andrew Morton , Dan Williams , Matthew Wilcox , Dave Hansen To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1449602325-20572-1-git-send-email-ross.zwisler@linux.intel.com> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org To properly support the new DAX fsync/msync infrastructure filesystems need to call dax_pfn_mkwrite() so that DAX can track when user pages are dirtied. Signed-off-by: Ross Zwisler --- fs/xfs/xfs_file.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index f5392ab..40ffbb1 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1603,9 +1603,8 @@ xfs_filemap_pmd_fault( /* * pfn_mkwrite was originally inteneded to ensure we capture time stamp * updates on write faults. In reality, it's need to serialise against - * truncate similar to page_mkwrite. Hence we open-code dax_pfn_mkwrite() - * here and cycle the XFS_MMAPLOCK_SHARED to ensure we serialise the fault - * barrier in place. + * truncate similar to page_mkwrite. Hence we cycle the XFS_MMAPLOCK_SHARED + * to ensure we serialise the fault barrier in place. */ static int xfs_filemap_pfn_mkwrite( @@ -1628,6 +1627,8 @@ xfs_filemap_pfn_mkwrite( size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; if (vmf->pgoff >= size) ret = VM_FAULT_SIGBUS; + else if (IS_DAX(inode)) + ret = dax_pfn_mkwrite(vma, vmf); xfs_iunlock(ip, XFS_MMAPLOCK_SHARED); sb_end_pagefault(inode->i_sb); return ret; -- 2.5.0 -- 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