[Qemu-devel] [PATCH 5/5] nbd: Drop unused offset parameter

[Eric Blake <eblake@redhat.com>]

Now that NBD relies on the block layer to fragment things, we no
longer need to track an offset argument for which fragment of
a request we are actually servicing.

While at it, use true and false instead of 0 and 1 for a bool
parameter.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 include/block/nbd.h |  1 -
 nbd/nbd-internal.h  |  4 ++--
 block/nbd-client.c  | 31 ++++++++++++++++---------------
 nbd/common.c        |  3 +--
 4 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/include/block/nbd.h b/include/block/nbd.h
index eeda3eb..503f514 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -89,7 +89,6 @@ enum {
 ssize_t nbd_wr_syncv(QIOChannel *ioc,
                      struct iovec *iov,
                      size_t niov,
-                     size_t offset,
                      size_t length,
                      bool do_read);
 int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags,
diff --git a/nbd/nbd-internal.h b/nbd/nbd-internal.h
index 26a9f4d..93a6ca8 100644
--- a/nbd/nbd-internal.h
+++ b/nbd/nbd-internal.h
@@ -101,14 +101,14 @@ static inline ssize_t read_sync(QIOChannel *ioc, void *buffer, size_t size)
      * our request/reply.  Synchronization is done with recv_coroutine, so
      * that this is coroutine-safe.
      */
-    return nbd_wr_syncv(ioc, &iov, 1, 0, size, true);
+    return nbd_wr_syncv(ioc, &iov, 1, size, true);
 }

 static inline ssize_t write_sync(QIOChannel *ioc, void *buffer, size_t size)
 {
     struct iovec iov = { .iov_base = buffer, .iov_len = size };

-    return nbd_wr_syncv(ioc, &iov, 1, 0, size, false);
+    return nbd_wr_syncv(ioc, &iov, 1, size, false);
 }

 struct NBDTLSHandshakeData {
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 9f023f8..5841a32 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -116,7 +116,7 @@ static void nbd_restart_write(void *opaque)

 static int nbd_co_send_request(BlockDriverState *bs,
                                struct nbd_request *request,
-                               QEMUIOVector *qiov, int offset)
+                               QEMUIOVector *qiov)
 {
     NbdClientSession *s = nbd_get_client_session(bs);
     AioContext *aio_context;
@@ -149,8 +149,8 @@ static int nbd_co_send_request(BlockDriverState *bs,
         qio_channel_set_cork(s->ioc, true);
         rc = nbd_send_request(s->ioc, request);
         if (rc >= 0) {
-            ret = nbd_wr_syncv(s->ioc, qiov->iov, qiov->niov,
-                               offset, request->len, 0);
+            ret = nbd_wr_syncv(s->ioc, qiov->iov, qiov->niov, request->len,
+                               false);
             if (ret != request->len) {
                 rc = -EIO;
             }
@@ -167,8 +167,9 @@ static int nbd_co_send_request(BlockDriverState *bs,
 }

 static void nbd_co_receive_reply(NbdClientSession *s,
-    struct nbd_request *request, struct nbd_reply *reply,
-    QEMUIOVector *qiov, int offset)
+                                 struct nbd_request *request,
+                                 struct nbd_reply *reply,
+                                 QEMUIOVector *qiov)
 {
     int ret;

@@ -181,8 +182,8 @@ static void nbd_co_receive_reply(NbdClientSession *s,
         reply->error = EIO;
     } else {
         if (qiov && reply->error == 0) {
-            ret = nbd_wr_syncv(s->ioc, qiov->iov, qiov->niov,
-                               offset, request->len, 1);
+            ret = nbd_wr_syncv(s->ioc, qiov->iov, qiov->niov, request->len,
+                               true);
             if (ret != request->len) {
                 reply->error = EIO;
             }
@@ -230,11 +231,11 @@ int nbd_client_co_readv(BlockDriverState *bs, int64_t sector_num,
     request.len = nb_sectors * 512;

     nbd_coroutine_start(client, &request);
-    ret = nbd_co_send_request(bs, &request, NULL, 0);
+    ret = nbd_co_send_request(bs, &request, NULL);
     if (ret < 0) {
         reply.error = -ret;
     } else {
-        nbd_co_receive_reply(client, &request, &reply, qiov, 0);
+        nbd_co_receive_reply(client, &request, &reply, qiov);
     }
     nbd_coroutine_end(client, &request);
     return -reply.error;
@@ -259,11 +260,11 @@ int nbd_client_co_writev(BlockDriverState *bs, int64_t sector_num,
     request.len = nb_sectors * 512;

     nbd_coroutine_start(client, &request);
-    ret = nbd_co_send_request(bs, &request, qiov, 0);
+    ret = nbd_co_send_request(bs, &request, qiov);
     if (ret < 0) {
         reply.error = -ret;
     } else {
-        nbd_co_receive_reply(client, &request, &reply, NULL, 0);
+        nbd_co_receive_reply(client, &request, &reply, NULL);
     }
     nbd_coroutine_end(client, &request);
     return -reply.error;
@@ -284,11 +285,11 @@ int nbd_client_co_flush(BlockDriverState *bs)
     request.len = 0;

     nbd_coroutine_start(client, &request);
-    ret = nbd_co_send_request(bs, &request, NULL, 0);
+    ret = nbd_co_send_request(bs, &request, NULL);
     if (ret < 0) {
         reply.error = -ret;
     } else {
-        nbd_co_receive_reply(client, &request, &reply, NULL, 0);
+        nbd_co_receive_reply(client, &request, &reply, NULL);
     }
     nbd_coroutine_end(client, &request);
     return -reply.error;
@@ -309,11 +310,11 @@ int nbd_client_co_discard(BlockDriverState *bs, int64_t sector_num,
     request.len = nb_sectors * 512;

     nbd_coroutine_start(client, &request);
-    ret = nbd_co_send_request(bs, &request, NULL, 0);
+    ret = nbd_co_send_request(bs, &request, NULL);
     if (ret < 0) {
         reply.error = -ret;
     } else {
-        nbd_co_receive_reply(client, &request, &reply, NULL, 0);
+        nbd_co_receive_reply(client, &request, &reply, NULL);
     }
     nbd_coroutine_end(client, &request);
     return -reply.error;
diff --git a/nbd/common.c b/nbd/common.c
index 8ddb2dd..4d8e211 100644
--- a/nbd/common.c
+++ b/nbd/common.c
@@ -23,7 +23,6 @@
 ssize_t nbd_wr_syncv(QIOChannel *ioc,
                      struct iovec *iov,
                      size_t niov,
-                     size_t offset,
                      size_t length,
                      bool do_read)
 {
@@ -35,7 +34,7 @@ ssize_t nbd_wr_syncv(QIOChannel *ioc,

     nlocal_iov = iov_copy(local_iov, nlocal_iov,
                           iov, niov,
-                          offset, length);
+                          0, length);

     while (nlocal_iov > 0) {
         ssize_t len;
-- 
2.5.5