[Qemu-devel] [PATCH v3 11/13] nbd: share some nbd entities to be reused in block/nbd-client.c

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/block/nbd.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 nbd/nbd-internal.h  | 25 -------------------------
 nbd/client.c        | 32 --------------------------------
 3 files changed, 48 insertions(+), 57 deletions(-)

diff --git a/include/block/nbd.h b/include/block/nbd.h
index dd261f66f0..09e4592971 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -77,6 +77,9 @@ typedef struct NBDStructuredReplyChunk {
     uint32_t length; /* length of payload */
 } QEMU_PACKED NBDStructuredReplyChunk;
 
+#define NBD_SIMPLE_REPLY_MAGIC      0x67446698
+#define NBD_STRUCTURED_REPLY_MAGIC  0x668e33ef
+
 typedef struct NBDStructuredRead {
     NBDStructuredReplyChunk h;
     uint64_t offset;
@@ -182,6 +185,40 @@ enum {
 #define NBD_SREP_TYPE_ERROR         NBD_SREP_ERR(1)
 #define NBD_SREP_TYPE_ERROR_OFFSET  NBD_SREP_ERR(2)
 
+/* NBD errors are based on errno numbers, so there is a 1:1 mapping,
+ * but only a limited set of errno values is specified in the protocol.
+ * Everything else is squashed to EINVAL.
+ */
+#define NBD_SUCCESS    0
+#define NBD_EPERM      1
+#define NBD_EIO        5
+#define NBD_ENOMEM     12
+#define NBD_EINVAL     22
+#define NBD_ENOSPC     28
+#define NBD_ESHUTDOWN  108
+
+static inline int nbd_errno_to_system_errno(int err)
+{
+    switch (err) {
+    case NBD_SUCCESS:
+        return 0;
+    case NBD_EPERM:
+        return EPERM;
+    case NBD_EIO:
+        return EIO;
+    case NBD_ENOMEM:
+        return ENOMEM;
+    case NBD_ENOSPC:
+        return ENOSPC;
+    case NBD_ESHUTDOWN:
+        return ESHUTDOWN;
+    case NBD_EINVAL:
+        return EINVAL;
+    }
+
+    return EINVAL;
+}
+
 /* Details collected by NBD_OPT_EXPORT_NAME and NBD_OPT_GO */
 struct NBDExportInfo {
     /* Set by client before nbd_receive_negotiate() */
@@ -235,4 +272,15 @@ void nbd_client_put(NBDClient *client);
 void nbd_server_start(SocketAddress *addr, const char *tls_creds,
                       Error **errp);
 
+/* nbd_read
+ * Reads @size bytes from @ioc. Returns 0 on success.
+ */
+static inline int nbd_read(QIOChannel *ioc, void *buffer, size_t size,
+                           Error **errp)
+{
+    return qio_channel_read_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
+}
+
+int nbd_drop(QIOChannel *ioc, size_t size, Error **errp);
+
 #endif
diff --git a/nbd/nbd-internal.h b/nbd/nbd-internal.h
index beb30a7a3e..970b560d11 100644
--- a/nbd/nbd-internal.h
+++ b/nbd/nbd-internal.h
@@ -47,8 +47,6 @@
 #define NBD_OLDSTYLE_NEGOTIATE_SIZE (8 + 8 + 8 + 4 + 124)
 
 #define NBD_REQUEST_MAGIC           0x25609513
-#define NBD_SIMPLE_REPLY_MAGIC      0x67446698
-#define NBD_STRUCTURED_REPLY_MAGIC  0x668e33ef
 #define NBD_OPTS_MAGIC              0x49484156454F5054LL
 #define NBD_CLIENT_MAGIC            0x0000420281861253LL
 #define NBD_REP_MAGIC               0x0003e889045565a9LL
@@ -65,18 +63,6 @@
 #define NBD_SET_TIMEOUT             _IO(0xab, 9)
 #define NBD_SET_FLAGS               _IO(0xab, 10)
 
-/* NBD errors are based on errno numbers, so there is a 1:1 mapping,
- * but only a limited set of errno values is specified in the protocol.
- * Everything else is squashed to EINVAL.
- */
-#define NBD_SUCCESS    0
-#define NBD_EPERM      1
-#define NBD_EIO        5
-#define NBD_ENOMEM     12
-#define NBD_EINVAL     22
-#define NBD_ENOSPC     28
-#define NBD_ESHUTDOWN  108
-
 /* nbd_read_eof
  * Tries to read @size bytes from @ioc.
  * Returns 1 on success
@@ -96,15 +82,6 @@ static inline int nbd_read_eof(QIOChannel *ioc, void *buffer, size_t size,
     return ret;
 }
 
-/* nbd_read
- * Reads @size bytes from @ioc. Returns 0 on success.
- */
-static inline int nbd_read(QIOChannel *ioc, void *buffer, size_t size,
-                           Error **errp)
-{
-    return qio_channel_read_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
-}
-
 /* nbd_write
  * Writes @size bytes to @ioc. Returns 0 on success.
  */
@@ -128,6 +105,4 @@ const char *nbd_rep_lookup(uint32_t rep);
 const char *nbd_info_lookup(uint16_t info);
 const char *nbd_cmd_lookup(uint16_t info);
 
-int nbd_drop(QIOChannel *ioc, size_t size, Error **errp);
-
 #endif
diff --git a/nbd/client.c b/nbd/client.c
index c8702a80b1..f0f3075569 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -22,38 +22,6 @@
 #include "trace.h"
 #include "nbd-internal.h"
 
-static int nbd_errno_to_system_errno(int err)
-{
-    int ret;
-    switch (err) {
-    case NBD_SUCCESS:
-        ret = 0;
-        break;
-    case NBD_EPERM:
-        ret = EPERM;
-        break;
-    case NBD_EIO:
-        ret = EIO;
-        break;
-    case NBD_ENOMEM:
-        ret = ENOMEM;
-        break;
-    case NBD_ENOSPC:
-        ret = ENOSPC;
-        break;
-    case NBD_ESHUTDOWN:
-        ret = ESHUTDOWN;
-        break;
-    default:
-        trace_nbd_unknown_error(err);
-        /* fallthrough */
-    case NBD_EINVAL:
-        ret = EINVAL;
-        break;
-    }
-    return ret;
-}
-
 /* Definitions for opaque data types */
 
 static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
-- 
2.11.1