ext4: disable map_sync for async flush
fix #27138800 commit e46bfc3f03d7894c0eb47c7d754c38bafe39e197 upstream. 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 ext4. Signed-off-by: NPankaj Gupta <pagupta@redhat.com> Reviewed-by: NJan Kara <jack@suse.cz> Signed-off-by: NDan Williams <dan.j.williams@intel.com> Reviewed-by: NYang Shi <yang.shi@linux.alibaba.com> Signed-off-by: NXunlei Pang <xlpang@linux.alibaba.com>
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