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From: Pankaj Gupta <pagupta@redhat.com>
To: 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, pbonzini@redhat.com,
	kilobyte@angband.pl, yuval.shaia@oracle.com, pagupta@redhat.com
Subject: [PATCH v7 4/6]  dax: check synchronous mapping is supported
Date: Fri, 26 Apr 2019 10:30:37 +0530	[thread overview]
Message-ID: <20190426050039.17460-5-pagupta@redhat.com> (raw)
In-Reply-To: <20190426050039.17460-1-pagupta@redhat.com>

This patch introduces 'daxdev_mapping_supported' helper
which checks if 'MAP_SYNC' is supported with filesystem
mapping. It also checks if corresponding dax_device is
synchronous. Virtio pmem device is asynchronous and
does not not support VM_SYNC. 

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 include/linux/dax.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/dax.h b/include/linux/dax.h
index c97fc0cc7167..41b4a5db6305 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -41,6 +41,18 @@ void kill_dax(struct dax_device *dax_dev);
 void dax_write_cache(struct dax_device *dax_dev, bool wc);
 bool dax_write_cache_enabled(struct dax_device *dax_dev);
 bool dax_synchronous(struct dax_device *dax_dev);
+/*
+ * Check if given mapping is supported by the file / underlying device.
+ */
+static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
+				struct dax_device *dax_dev)
+{
+	if (!(vma->vm_flags & VM_SYNC))
+		return true;
+	if (!IS_DAX(file_inode(vma->vm_file)))
+		return false;
+	return dax_synchronous(dax_dev);
+}
 #else
 static inline struct dax_device *dax_get_by_host(const char *host)
 {
@@ -68,6 +80,11 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev)
 {
 	return false;
 }
+static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
+				struct dax_device *dax_dev)
+{
+	return !(vma->flags & VM_SYNC);
+}
 #endif
 
 struct writeback_control;
-- 
2.20.1


  parent reply	other threads:[~2019-04-26  5:02 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-26  5:00 [PATCH v7 0/6] virtio pmem driver Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 1/6] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 2/6] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-04-30  5:53   ` [Qemu-devel] " Yuval Shaia
2019-04-30  6:06     ` Pankaj Gupta
2019-05-07 15:35   ` Dan Williams
2019-05-08 11:19     ` [Qemu-devel] " Pankaj Gupta
2019-05-10 23:33       ` Dan Williams
2019-05-11  1:26         ` Pankaj Gupta
2019-05-07 20:25   ` Jakub Staroń
2019-05-08 11:12     ` Pankaj Gupta
2019-05-08 15:23       ` Pankaj Gupta
2019-05-08 19:05       ` Jakub Staroń
2019-04-26  5:00 ` [PATCH v7 3/6] libnvdimm: add dax_dev sync flag Pankaj Gupta
2019-05-07 15:40   ` Dan Williams
2019-05-09 12:24     ` Pankaj Gupta
2019-04-26  5:00 ` Pankaj Gupta [this message]
2019-05-07 19:24   ` [Qemu-devel] [PATCH v7 4/6] dax: check synchronous mapping is supported Jakub Staroń
2019-05-08  5:31     ` Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 5/6] ext4: disable map_sync for async flush Pankaj Gupta
2019-04-26  5:00 ` [PATCH v7 6/6] xfs: " Pankaj Gupta
2019-05-07 15:37   ` Dan Williams
2019-05-07 16:17     ` Darrick J. Wong
2019-05-08  5:49       ` [Qemu-devel] " Pankaj Gupta

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