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| author |   Michael S. Tsirkin <mst@redhat.com> | 2019-09-04 08:36:33 -0400 |
|---|---|---|
| committer |   Miklos Szeredi <mszeredi@redhat.com> | 2019-09-12 14:59:41 +0200 |
| commit | 501ae8ecae2ba5122774dee4445003505a7fd01b (patch) | |
| tree | efc4bec9cf41a6994df88f5ed0e1acbd65b35692 /include/uapi/linux/fuse.h | |
| parent | fuse: allow skipping control interface and forced unmount (diff) | |
| download | linux-dev-501ae8ecae2ba5122774dee4445003505a7fd01b.tar.xz linux-dev-501ae8ecae2ba5122774dee4445003505a7fd01b.zip | |
fuse: reserve byteswapped init opcodes
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>
Diffstat (limited to 'include/uapi/linux/fuse.h')
| -rw-r--r-- | include/uapi/linux/fuse.h | 4 |
1 files changed, 4 insertions, 0 deletions
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 { |