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authorPankaj Gupta <pagupta@redhat.com>2019-07-05 19:33:28 +0530
committerDan Williams <dan.j.williams@intel.com>2019-07-05 15:19:10 -0700
commitb21fec414095d966789581c1466fb2f55de33bfe (patch)
tree86f35b782b92ed78f5063b8658bbac2966db0318 /fs/xfs
parente46bfc3f03d7894c0eb47c7d754c38bafe39e197 (diff)
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: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_file.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 76748255f843..a06af58af475 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -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);