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[Qemu-devel] [PATCH v7 4/6] dax: check synchronous mapping is supported
From: |
Pankaj Gupta |
Subject: |
[Qemu-devel] [PATCH v7 4/6] dax: check synchronous mapping is supported |
Date: |
Fri, 26 Apr 2019 10:30:37 +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>
Reviewed-by: Jan Kara <address@hidden>
---
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
- [Qemu-devel] [PATCH v7 0/6] virtio pmem driver, Pankaj Gupta, 2019/04/26
- [Qemu-devel] [PATCH v7 1/6] libnvdimm: nd_region flush callback support, Pankaj Gupta, 2019/04/26
- [Qemu-devel] [PATCH v7 2/6] virtio-pmem: Add virtio pmem driver, Pankaj Gupta, 2019/04/26
- [Qemu-devel] [PATCH v7 3/6] libnvdimm: add dax_dev sync flag, Pankaj Gupta, 2019/04/26
- [Qemu-devel] [PATCH v7 4/6] dax: check synchronous mapping is supported,
Pankaj Gupta <=
- [Qemu-devel] [PATCH v7 5/6] ext4: disable map_sync for async flush, Pankaj Gupta, 2019/04/26
- [Qemu-devel] [PATCH v7 6/6] xfs: disable map_sync for async flush, Pankaj Gupta, 2019/04/26