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authorPaolo Bonzini <pbonzini@redhat.com>2011-09-19 14:25:30 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2011-12-22 11:53:58 +0100
commit220455920384af77670e84953f3763153e39bcfa (patch)
tree014c5d59371f102277da6724b70aa143c5e22803 /nbd.c
parenta478f6e595dab1801931d56d097623d65f5b6d1d (diff)
downloadqemu-arm-220455920384af77670e84953f3763153e39bcfa.tar.gz
qemu-nbd: introduce nbd_do_send_reply
Group the sending of a reply and the associated data into a new function. Without corking, the caller would be forced to leave 12 free bytes at the beginning of the data pointer. Not too ugly, but still ugly. :) Using nbd_do_send_reply everywhere will help when the routine will set up the write handler that re-enters the send coroutine. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'nbd.c')
-rw-r--r--nbd.c46
1 files changed, 32 insertions, 14 deletions
diff --git a/nbd.c b/nbd.c
index d383d854fe..025c5b0f1d 100644
--- a/nbd.c
+++ b/nbd.c
@@ -583,6 +583,34 @@ static int nbd_send_reply(int csock, struct nbd_reply *reply)
return 0;
}
+static int nbd_do_send_reply(int csock, struct nbd_reply *reply,
+ uint8_t *data, int len)
+{
+ int rc, ret;
+
+ if (!len) {
+ rc = nbd_send_reply(csock, reply);
+ if (rc == -1) {
+ rc = -errno;
+ }
+ } else {
+ socket_set_cork(csock, 1);
+ rc = nbd_send_reply(csock, reply);
+ if (rc != -1) {
+ ret = write_sync(csock, data, len);
+ if (ret != len) {
+ errno = EIO;
+ rc = -1;
+ }
+ }
+ if (rc == -1) {
+ rc = -errno;
+ }
+ socket_set_cork(csock, 0);
+ }
+ return rc;
+}
+
int nbd_trip(BlockDriverState *bs, int csock, off_t size,
uint64_t dev_offset, uint32_t nbdflags,
uint8_t *data)
@@ -637,18 +665,8 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size,
}
TRACE("Read %u byte(s)", request.len);
- socket_set_cork(csock, 1);
- if (nbd_send_reply(csock, &reply) == -1)
+ if (nbd_do_send_reply(csock, &reply, data, request.len) < 0)
return -1;
-
- TRACE("Sending data to client");
-
- if (write_sync(csock, data, request.len) != request.len) {
- LOG("writing to socket failed");
- errno = EINVAL;
- return -1;
- }
- socket_set_cork(csock, 0);
break;
case NBD_CMD_WRITE:
TRACE("Request type is WRITE");
@@ -684,7 +702,7 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size,
}
}
- if (nbd_send_reply(csock, &reply) == -1)
+ if (nbd_do_send_reply(csock, &reply, NULL, 0) < 0)
return -1;
break;
case NBD_CMD_DISC:
@@ -700,7 +718,7 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size,
reply.error = -ret;
}
- if (nbd_send_reply(csock, &reply) == -1)
+ if (nbd_do_send_reply(csock, &reply, NULL, 0) < 0)
return -1;
break;
case NBD_CMD_TRIM:
@@ -711,7 +729,7 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size,
LOG("discard failed");
reply.error = -ret;
}
- if (nbd_send_reply(csock, &reply) == -1)
+ if (nbd_do_send_reply(csock, &reply, NULL, 0) < 0)
return -1;
break;
default: