Messages in this thread Patch in this message | | | From | Miklos Szeredi <> | Subject | [PATCH v5 1/4] fuse: reserve byteswapped init opcodes | Date | Tue, 10 Sep 2019 17:12:03 +0200 |
| |
From: "Michael S. Tsirkin" <mst@redhat.com>
virtio fs tunnels fuse over a virtio channel. One issue is two sides might be speaking different endian-ness. To detects this, host side looks at the opcode value in the FUSE_INIT command. Works fine at the moment but might fail if a future version of fuse will use such an opcode for initialization. Let's reserve this opcode so we remember and don't do this.
Same for CUSE_INIT.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> --- include/uapi/linux/fuse.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h index 2971d29a42e4..df2e12fb3381 100644 --- a/include/uapi/linux/fuse.h +++ b/include/uapi/linux/fuse.h @@ -425,6 +425,10 @@ enum fuse_opcode { /* CUSE specific operations */ CUSE_INIT = 4096, + + /* Reserved opcodes: helpful to detect structure endian-ness */ + CUSE_INIT_BSWAP_RESERVED = 1048576, /* CUSE_INIT << 8 */ + FUSE_INIT_BSWAP_RESERVED = 436207616, /* FUSE_INIT << 24 */ }; enum fuse_notify_code { -- 2.21.0
| |