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 v5 4/6] dax: check synchronous mapping is supported
Date: Wed, 10 Apr 2019 09:38:24 +0530 [thread overview]
Message-ID: <20190410040826.24371-5-pagupta@redhat.com> (raw)
In-Reply-To: <20190410040826.24371-1-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>
---
include/linux/dax.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/include/linux/dax.h b/include/linux/dax.h
index b896706a5ee9..4a2a60ffec86 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -38,6 +38,24 @@ 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);
+
+/*
+ * Callers check if synchronous mapping is enabled for DAX file
+ * and attached dax device is also synchronous.
+ *
+ * dax_synchronous function verifies if dax device is synchronous.
+ * Currently, only virtio pmem device supports asynchronous device
+ * flush.
+ */
+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)
{
@@ -69,6 +87,11 @@ static inline bool dax_synchronous(struct dax_device *dax_dev)
{
return true;
}
+static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
+ struct dax_device *dax_dev)
+{
+ return true;
+}
#endif
struct writeback_control;
--
2.20.1
next prev parent reply other threads:[~2019-04-10 4:10 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-10 4:08 [PATCH v5 0/6] virtio pmem driver Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 1/6] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-04-11 14:51 ` Dan Williams
2019-04-11 15:57 ` [Qemu-devel] " Pankaj Gupta
2019-04-11 16:09 ` Dan Williams
2019-04-11 16:23 ` Pankaj Gupta
2019-04-12 8:32 ` Jan Kara
2019-04-12 13:12 ` Jeff Moyer
2019-04-18 6:27 ` [Qemu-devel] " Pankaj Gupta
2019-04-18 16:05 ` Dan Williams
2019-04-18 16:10 ` Jeff Moyer
2019-04-18 16:18 ` Christoph Hellwig
2019-04-18 18:14 ` Dan Williams
2019-04-22 15:51 ` Jeff Moyer
2019-04-22 19:44 ` Dan Williams
2019-04-22 21:03 ` Jeff Moyer
2019-04-23 4:07 ` Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 2/5] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-04-10 12:24 ` Cornelia Huck
2019-04-10 14:38 ` Yuval Shaia
2019-04-10 15:44 ` Pankaj Gupta
2019-04-10 15:38 ` Pankaj Gupta
2019-04-10 13:12 ` Michael S. Tsirkin
2019-04-10 14:03 ` [Qemu-devel] " Pankaj Gupta
2019-04-10 14:31 ` Cornelia Huck
2019-04-10 16:46 ` Michael S. Tsirkin
2019-04-10 16:52 ` Cornelia Huck
2019-04-10 14:41 ` Yuval Shaia
2019-04-10 4:08 ` [PATCH v5 3/6] libnvdimm: add dax_dev sync flag Pankaj Gupta
2019-04-10 8:28 ` Jan Kara
2019-04-10 8:38 ` Pankaj Gupta
2019-04-11 14:56 ` Dan Williams
2019-04-11 15:39 ` Pankaj Gupta
2019-04-10 4:08 ` Pankaj Gupta [this message]
2019-04-10 8:25 ` [PATCH v5 4/6] dax: check synchronous mapping is supported Jan Kara
2019-04-10 8:31 ` Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 5/6] ext4: disable map_sync for async flush Pankaj Gupta
2019-04-10 4:08 ` [PATCH v5 6/6] xfs: " Pankaj Gupta
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