On Tue, Apr 23, 2019 at 01:36:12PM +0530, Pankaj Gupta wrote:
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(a)redhat.com>
fs/xfs/xfs_file.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 1f2e2845eb76..0e59be018511 100644
@@ -1196,11 +1196,13 @@ xfs_file_mmap(
struct file *filp,
struct vm_area_struct *vma)
- * We don't support synchronous mappings for non-DAX files. At least
- * until someone comes with a sensible use case.
+ struct dax_device *dax_dev = xfs_find_daxdev_for_inode
+ /* We don't support synchronous mappings for non-DAX files and
+ * for DAX files if underneath dax_device is not synchronous.
* This is the correct multi-line comment format. Please
* update the patch to maintain the existing comment format.