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[Qemu-devel] [PATCH v5 4/6] dax: check synchronous mapping is supported
From: |
Pankaj Gupta |
Subject: |
[Qemu-devel] [PATCH v5 4/6] dax: check synchronous mapping is supported |
Date: |
Wed, 10 Apr 2019 09:38:24 +0530 |
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 <address@hidden>
Signed-off-by: Pankaj Gupta <address@hidden>
---
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
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, (continued)
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Jeff Moyer, 2019/04/12
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Pankaj Gupta, 2019/04/18
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Dan Williams, 2019/04/18
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Jeff Moyer, 2019/04/18
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Christoph Hellwig, 2019/04/18
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Dan Williams, 2019/04/18
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Jeff Moyer, 2019/04/22
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Dan Williams, 2019/04/22
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Jeff Moyer, 2019/04/22
- Re: [Qemu-devel] [PATCH v5 1/6] libnvdimm: nd_region flush callback support, Pankaj Gupta, 2019/04/23
[Qemu-devel] [PATCH v5 4/6] dax: check synchronous mapping is supported,
Pankaj Gupta <=
[Qemu-devel] [PATCH v5 2/5] virtio-pmem: Add virtio pmem driver, Pankaj Gupta, 2019/04/10
Re: [Qemu-devel] [PATCH v5 2/5] virtio-pmem: Add virtio pmem driver, Michael S. Tsirkin, 2019/04/10