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nbd: Share common option-sending code in client

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Rather than open-coding each option request, it's easier to
have common helper functions do the work.  That in turn requires
having convenient packed types for handling option requests
and replies.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1476469998-28592-9-git-send-email-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Blake 2016-10-14 13:33:10 -05:00 • committed by Paolo Bonzini
parent 3668328303
commit c8a3a1b6c4
3 changed files with 131 additions and 151 deletions
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25
include/block/nbd.h
View file

@ -26,15 +26,34 @@
#include "io/channel-socket.h"
#include "crypto/tlscreds.h"
/* Note: these are _NOT_ the same as the network representation of an NBD
/* Handshake phase structs - this struct is passed on the wire */
struct nbd_option {
uint64_t magic; /* NBD_OPTS_MAGIC */
uint32_t option; /* NBD_OPT_* */
uint32_t length;
} QEMU_PACKED;
typedef struct nbd_option nbd_option;
struct nbd_opt_reply {
uint64_t magic; /* NBD_REP_MAGIC */
uint32_t option; /* NBD_OPT_* */
uint32_t type; /* NBD_REP_* */
uint32_t length;
} QEMU_PACKED;
typedef struct nbd_opt_reply nbd_opt_reply;
/* Transmission phase structs
*
* Note: these are _NOT_ the same as the network representation of an NBD
* request and reply!
*/
struct NBDRequest {
uint64_t handle;
uint64_t from;
uint32_t len;
uint16_t flags;
uint16_t type;
uint16_t flags; /* NBD_CMD_FLAG_* */
uint16_t type; /* NBD_CMD_* */
};
typedef struct NBDRequest NBDRequest;