diff options
Diffstat (limited to 'pkg/abi')
| -rw-r--r-- | pkg/abi/linux/fuse.go | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/pkg/abi/linux/fuse.go b/pkg/abi/linux/fuse.go index d105c5176..ca4ee5e80 100644 --- a/pkg/abi/linux/fuse.go +++ b/pkg/abi/linux/fuse.go @@ -15,6 +15,7 @@ package linux import ( + "gvisor.dev/gvisor/pkg/usermem" "gvisor.dev/gvisor/tools/go_marshal/marshal" "gvisor.dev/gvisor/tools/go_marshal/primitive" ) @@ -262,6 +263,63 @@ type FUSEInitOut struct { _ [8]uint32 } +// FUSEInitRes is a variable-length wrapper of FUSEInitOut. The FUSE server may +// implement older version of FUSE protocol, which contains a FUSEInitOut with +// less attributes. +// +// Dynamically-sized objects cannot be marshalled. +type FUSEInitRes struct { + marshal.StubMarshallable + + // InitOut contains the response from the FUSE server. + InitOut FUSEInitOut + + // Len is the total length of bytes of the response. + Len uint32 +} + +// UnMarshalBytes deserializes src to the InitOut attribute in a FUSEInitRes. +func (r *FUSEInitRes) UnmarshalBytes(src []byte) { + out := &r.InitOut + + // Introduced before FUSE kernel version 7.13. + out.Major = uint32(usermem.ByteOrder.Uint32(src[:4])) + src = src[4:] + out.Minor = uint32(usermem.ByteOrder.Uint32(src[:4])) + src = src[4:] + out.MaxReadahead = uint32(usermem.ByteOrder.Uint32(src[:4])) + src = src[4:] + out.Flags = uint32(usermem.ByteOrder.Uint32(src[:4])) + src = src[4:] + out.MaxBackground = uint16(usermem.ByteOrder.Uint16(src[:2])) + src = src[2:] + out.CongestionThreshold = uint16(usermem.ByteOrder.Uint16(src[:2])) + src = src[2:] + out.MaxWrite = uint32(usermem.ByteOrder.Uint32(src[:4])) + src = src[4:] + + // Introduced in FUSE kernel version 7.23. + if len(src) >= 4 { + out.TimeGran = uint32(usermem.ByteOrder.Uint32(src[:4])) + src = src[4:] + } + // Introduced in FUSE kernel version 7.28. + if len(src) >= 2 { + out.MaxPages = uint16(usermem.ByteOrder.Uint16(src[:2])) + src = src[2:] + } + // Introduced in FUSE kernel version 7.31. + if len(src) >= 2 { + out.MapAlignment = uint16(usermem.ByteOrder.Uint16(src[:2])) + src = src[2:] + } +} + +// SizeBytes is the size of the payload of the FUSE_INIT response. +func (r *FUSEInitRes) SizeBytes() int { + return int(r.Len) +} + // FUSEGetAttrIn is the request sent by the kernel to the daemon, // to get the attribute of a inode. // |