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authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>2017-10-27 12:40:35 +0200
committerEric Blake <eblake@redhat.com>2017-10-30 21:48:32 +0100
commitd2febedb45729d1fe431ca7c1ed9519acfb454c4 (patch)
tree7448dd5b0ab5ae8fa857f7d9640515ff004ad56a /include/block
parentd795299bf497a6155f6cecff83a5e41bb37aba2c (diff)
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nbd/client: prepare nbd_receive_reply for structured reply
In following patch nbd_receive_reply will be used both for simple and structured reply header receiving. NBDReply is altered into union of simple reply header and structured reply chunk header, simple error translation moved to block/nbd-client to be consistent with further structured reply error translation. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20171027104037.8319-11-eblake@redhat.com>
Diffstat (limited to 'include/block')
-rw-r--r--include/block/nbd.h30
1 files changed, 24 insertions, 6 deletions
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 225e957..2ee1578 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -57,12 +57,6 @@ struct NBDRequest {
};
typedef struct NBDRequest NBDRequest;
-struct NBDReply {
- uint64_t handle;
- uint32_t error;
-};
-typedef struct NBDReply NBDReply;
-
typedef struct NBDSimpleReply {
uint32_t magic; /* NBD_SIMPLE_REPLY_MAGIC */
uint32_t error;
@@ -78,6 +72,20 @@ typedef struct NBDStructuredReplyChunk {
uint32_t length; /* length of payload */
} QEMU_PACKED NBDStructuredReplyChunk;
+typedef union NBDReply {
+ NBDSimpleReply simple;
+ NBDStructuredReplyChunk structured;
+ struct {
+ /* @magic and @handle fields have the same offset and size both in
+ * simple reply and structured reply chunk, so let them be accessible
+ * without ".simple." or ".structured." specification
+ */
+ uint32_t magic;
+ uint32_t _skip;
+ uint64_t handle;
+ } QEMU_PACKED;
+} NBDReply;
+
/* Header of NBD_REPLY_TYPE_OFFSET_DATA, complete NBD_REPLY_TYPE_OFFSET_HOLE */
typedef struct NBDStructuredRead {
NBDStructuredReplyChunk h;
@@ -256,4 +264,14 @@ void nbd_client_put(NBDClient *client);
void nbd_server_start(SocketAddress *addr, const char *tls_creds,
Error **errp);
+static inline bool nbd_reply_is_simple(NBDReply *reply)
+{
+ return reply->magic == NBD_SIMPLE_REPLY_MAGIC;
+}
+
+static inline bool nbd_reply_is_structured(NBDReply *reply)
+{
+ return reply->magic == NBD_STRUCTURED_REPLY_MAGIC;
+}
+
#endif