Commit b21fec41 authored by Pankaj Gupta's avatar Pankaj Gupta Committed by Dan Williams
Browse files

xfs: disable map_sync for async flush 



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: default avatarPankaj Gupta <pagupta@redhat.com>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent e46bfc3f

fs/xfs/xfs_file.c

+6 −3
Original line number Diff line number Diff line
@@ -1203,11 +1203,14 @@ xfs_file_mmap( 
	struct file	*filp,

	struct vm_area_struct *vma)

{

	struct dax_device 	*dax_dev;



	dax_dev = xfs_find_daxdev_for_inode(file_inode(filp));

	/*

	 * We don't support synchronous mappings for non-DAX files. At least

	 * until someone comes with a sensible use case.

	 * We don't support synchronous mappings for non-DAX files and

	 * for DAX files if underneath dax_device is not synchronous.

	 */

	if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC))

	if (!daxdev_mapping_supported(vma, dax_dev))

		return -EOPNOTSUPP;



	file_accessed(filp);

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