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From: Pankaj Gupta <pagupta@redhat.com>
To: dm-devel@redhat.com, linux-nvdimm@lists.01.org,
	linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org,
	qemu-devel@nongnu.org, linux-ext4@vger.kernel.org,
	linux-xfs@vger.kernel.org
Cc: dan.j.williams@intel.com, zwisler@kernel.org,
	vishal.l.verma@intel.com, dave.jiang@intel.com, mst@redhat.com,
	jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net,
	hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu,
	adilger.kernel@dilger.ca, darrick.wong@oracle.com,
	lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com,
	jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com,
	stefanha@redhat.com, aarcange@redhat.com, david@redhat.com,
	david@fromorbit.com, cohuck@redhat.com,
	xiaoguangrong.eric@gmail.com, pagupta@redhat.com,
	pbonzini@redhat.com, yuval.shaia@oracle.com, kilobyte@angband.pl,
	jstaron@google.com, rdunlap@infradead.org, snitzer@redhat.com
Subject: [PATCH v13 7/7] xfs: disable map_sync for async flush
Date: Wed, 12 Jun 2019 18:15:27 +0530
Message-ID: <20190612124527.3763-8-pagupta@redhat.com> (raw)
In-Reply-To: <20190612124527.3763-1-pagupta@redhat.com>

Dont support 'MAP_SYNC' with non-DAX files and DAX files
with asynchronous dax_device. Virtio pmem provides
asynchronous host page cache flush mechanism. We don't
support 'MAP_SYNC' with virtio pmem and xfs.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/xfs_file.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index a7ceae90110e..f17652cca5ff 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1203,11 +1203,14 @@ xfs_file_mmap(
 	struct file	*filp,
 	struct vm_area_struct *vma)
 {
+	struct dax_device 	*dax_dev;
+
+	dax_dev = xfs_find_daxdev_for_inode(file_inode(filp));
 	/*
-	 * We don't support synchronous mappings for non-DAX files. At least
-	 * until someone comes with a sensible use case.
+	 * We don't support synchronous mappings for non-DAX files and
+	 * for DAX files if underneath dax_device is not synchronous.
 	 */
-	if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC))
+	if (!daxdev_mapping_supported(vma, dax_dev))
 		return -EOPNOTSUPP;
 
 	file_accessed(filp);
-- 
2.20.1


      parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 12:45 [PATCH v13 0/7] virtio pmem driver Pankaj Gupta
2019-06-12 12:45 ` [PATCH v13 1/7] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-06-12 12:45 ` [PATCH v13 2/7] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-06-12 14:20   ` Cornelia Huck
2019-06-13  3:42     ` [Qemu-devel] " Pankaj Gupta
2019-06-12 12:45 ` [PATCH v13 3/7] libnvdimm: add dax_dev sync flag Pankaj Gupta
2019-06-12 12:45 ` [PATCH v13 4/7] dm: enable synchronous dax Pankaj Gupta
2019-06-12 12:45 ` [PATCH v13 5/7] dax: check synchronous mapping is supported Pankaj Gupta
2019-06-12 12:45 ` [PATCH v13 6/7] ext4: disable map_sync for async flush Pankaj Gupta
2019-06-12 12:45 ` Pankaj Gupta [this message]

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