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vhost_rs: Allow MasterReqHandler to reply when needed

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No matter if the communication is coming from the master or the slave,
it should always reply with an ack if the message header specifies that
it expects a reply.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-08-07 10:50:17 -07:00 committed by Samuel Ortiz
parent ef2e8b6bc2
commit c6feb03dc0
1 changed files with 42 additions and 10 deletions
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52
vhost_rs/src/vhost_user/master_req_handler.rs
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@ -109,14 +109,14 @@ impl<S: VhostUserMasterReqHandler> MasterReqHandler<S> {
}
};
match hdr.get_code() {
let res = match hdr.get_code() {
SlaveReq::CONFIG_CHANGE_MSG => {
self.check_msg_size(&hdr, size, 0)?;
self.backend
.lock()
.unwrap()
.handle_config_change()
.map_err(Error::ReqHandlerError)?;
.map_err(Error::ReqHandlerError)
}
SlaveReq::FS_MAP => {
let msg = self.extract_msg_body::<VhostUserFSSlaveMsg>(&hdr, size, &buf)?;
@ -124,7 +124,7 @@ impl<S: VhostUserMasterReqHandler> MasterReqHandler<S> {
.lock()
.unwrap()
.fs_slave_map(msg, rfds.unwrap()[0])
.map_err(Error::ReqHandlerError)?;
.map_err(Error::ReqHandlerError)
}
SlaveReq::FS_UNMAP => {
let msg = self.extract_msg_body::<VhostUserFSSlaveMsg>(&hdr, size, &buf)?;
@ -132,7 +132,7 @@ impl<S: VhostUserMasterReqHandler> MasterReqHandler<S> {
.lock()
.unwrap()
.fs_slave_unmap(msg)
.map_err(Error::ReqHandlerError)?;
.map_err(Error::ReqHandlerError)
}
SlaveReq::FS_SYNC => {
let msg = self.extract_msg_body::<VhostUserFSSlaveMsg>(&hdr, size, &buf)?;
@ -140,14 +140,14 @@ impl<S: VhostUserMasterReqHandler> MasterReqHandler<S> {
.lock()
.unwrap()
.fs_slave_sync(msg)
.map_err(Error::ReqHandlerError)?;
.map_err(Error::ReqHandlerError)
}
_ => {
return Err(Error::InvalidMessage);
}
}
_ => Err(Error::InvalidMessage),
};
Ok(())
self.send_ack_message(&hdr, &res)?;
res
}
fn check_state(&self) -> Result<()> {
@ -217,6 +217,38 @@ impl<S: VhostUserMasterReqHandler> MasterReqHandler<S> {
}
Ok(msg)
}
fn new_reply_header<T: Sized>(
&self,
req: &VhostUserMsgHeader<SlaveReq>,
) -> Result<VhostUserMsgHeader<SlaveReq>> {
if mem::size_of::<T>() > MAX_MSG_SIZE {
return Err(Error::InvalidParam);
}
self.check_state()?;
Ok(VhostUserMsgHeader::new(
req.get_code(),
VhostUserHeaderFlag::REPLY.bits(),
mem::size_of::<T>() as u32,
))
}
fn send_ack_message(
&mut self,
req: &VhostUserMsgHeader<SlaveReq>,
res: &Result<()>,
) -> Result<()> {
if req.is_need_reply() {
let hdr = self.new_reply_header::<VhostUserU64>(req)?;
let val = match res {
Ok(_) => 0,
Err(_) => 1,
};
let msg = VhostUserU64::new(val);
self.sub_sock.send_message(&hdr, &msg, None)?;
}
Ok(())
}
}
impl<S: VhostUserMasterReqHandler> AsRawFd for MasterReqHandler<S> {