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nbd: fix error handling in the server 

bdrv_read and bdrv_write return negative errno values, not -1.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-09-13 17:27:45 +02:00
parent ecda3447d1
commit adcf6302de
1 changed files with 12 additions and 9 deletions
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21
nbd.c
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@ -595,6 +595,7 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
{
struct nbd_request request;
struct nbd_reply reply;
int ret;
TRACE("Reading request.");
@ -633,12 +634,13 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
case NBD_CMD_READ:
TRACE("Request type is READ");
if (bdrv_read(bs, (request.from + dev_offset) / 512,
data + NBD_REPLY_SIZE,
request.len / 512) == -1) {
ret = bdrv_read(bs, (request.from + dev_offset) / 512,
data + NBD_REPLY_SIZE,
request.len / 512);
if (ret < 0) {
LOG("reading from file failed");
errno = EINVAL;
return -1;
reply.error = -ret;
request.len = 0;
}
*offset += request.len;
@ -681,11 +683,12 @@ int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
} else {
TRACE("Writing to device");
if (bdrv_write(bs, (request.from + dev_offset) / 512,
data, request.len / 512) == -1) {
ret = bdrv_write(bs, (request.from + dev_offset) / 512,
data, request.len / 512);
if (ret < 0) {
LOG("writing to file failed");
errno = EINVAL;
return -1;
reply.error = -ret;
request.len = 0;
}
*offset += request.len;