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authorPaolo Bonzini <pbonzini@redhat.com>2011-09-19 15:07:54 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2011-12-22 11:53:58 +0100
commita030b347aaa84e2d1b42c9cb2bc9e2d8bec50046 (patch)
treec157c24d0933033aec89861c1f8e1c1ad3efc3d0 /nbd.c
parentfae69416294223d84db425e58e7bbf6a08c45801 (diff)
downloadqemu-arm-a030b347aaa84e2d1b42c9cb2bc9e2d8bec50046.tar.gz
qemu-nbd: introduce nbd_do_receive_request
Group the receiving of a response and the associated data into a new function. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'nbd.c')
-rw-r--r--nbd.c68
1 files changed, 47 insertions, 21 deletions
diff --git a/nbd.c b/nbd.c
index 053ad8d00d..964a732d5c 100644
--- a/nbd.c
+++ b/nbd.c
@@ -611,6 +611,47 @@ static int nbd_do_send_reply(int csock, struct nbd_reply *reply,
return rc;
}
+static int nbd_do_receive_request(int csock, struct nbd_request *request,
+ uint8_t *data)
+{
+ int rc;
+
+ if (nbd_receive_request(csock, request) == -1) {
+ rc = -EIO;
+ goto out;
+ }
+
+ if (request->len > NBD_BUFFER_SIZE) {
+ LOG("len (%u) is larger than max len (%u)",
+ request->len, NBD_BUFFER_SIZE);
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if ((request->from + request->len) < request->from) {
+ LOG("integer overflow detected! "
+ "you're probably being attacked");
+ rc = -EINVAL;
+ goto out;
+ }
+
+ TRACE("Decoding type");
+
+ if ((request->type & NBD_CMD_MASK_COMMAND) == NBD_CMD_WRITE) {
+ TRACE("Reading %u byte(s)", request->len);
+
+ if (read_sync(csock, data, request->len) != request->len) {
+ LOG("reading from socket failed");
+ rc = -EIO;
+ goto out;
+ }
+ }
+ rc = 0;
+
+out:
+ return rc;
+}
+
int nbd_trip(BlockDriverState *bs, int csock, off_t size,
uint64_t dev_offset, uint32_t nbdflags,
uint8_t *data)
@@ -621,22 +662,17 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size,
TRACE("Reading request.");
- if (nbd_receive_request(csock, &request) == -1)
+ ret = nbd_do_receive_request(csock, &request, data);
+ if (ret == -EIO) {
return -1;
+ }
reply.handle = request.handle;
reply.error = 0;
- if (request.len > NBD_BUFFER_SIZE) {
- LOG("len (%u) is larger than max len (%u)",
- request.len, NBD_BUFFER_SIZE);
- goto invalid_request;
- }
-
- if ((request.from + request.len) < request.from) {
- LOG("integer overflow detected! "
- "you're probably being attacked");
- goto invalid_request;
+ if (ret < 0) {
+ reply.error = -ret;
+ goto error_reply;
}
if ((request.from + request.len) > size) {
@@ -647,8 +683,6 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size,
goto invalid_request;
}
- TRACE("Decoding type");
-
switch (request.type & NBD_CMD_MASK_COMMAND) {
case NBD_CMD_READ:
TRACE("Request type is READ");
@@ -668,14 +702,6 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size,
case NBD_CMD_WRITE:
TRACE("Request type is WRITE");
- TRACE("Reading %u byte(s)", request.len);
-
- if (read_sync(csock, data, request.len) != request.len) {
- LOG("reading from socket failed");
- errno = EINVAL;
- return -1;
- }
-
if (nbdflags & NBD_FLAG_READ_ONLY) {
TRACE("Server is read-only, return error");
reply.error = EROFS;