[PATCH v3 5/5] xfs: disable map_sync for virtio pmem
From: Pankaj Gupta <hidden>
Date: 2019-01-09 13:56:31
Also in:
kvm, linux-acpi, linux-fsdevel, linux-xfs, lkml, nvdimm, qemu-devel
Subsystem:
filesystems (vfs and infrastructure), the rest, xfs filesystem · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds, Carlos Maiolino
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 <redacted> --- fs/xfs/xfs_file.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index e474250..eae4aa4 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c@@ -1190,6 +1190,14 @@ xfs_file_mmap( if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC)) return -EOPNOTSUPP; + /* We don't support synchronous mappings with guest direct access + * and virtio based host page cache mechanism. + */ + if (IS_DAX(file_inode(filp)) && virtio_pmem_host_cache_enabled( + xfs_find_daxdev_for_inode(file_inode(filp))) && + (vma->vm_flags & VM_SYNC)) + return -EOPNOTSUPP; + file_accessed(filp); vma->vm_ops = &xfs_file_vm_ops; if (IS_DAX(file_inode(filp)))
--
2.9.3