Message ID | 1374741125-31859-4-git-send-email-morita.kazutaka@lab.ntt.co.jp |
---|---|
State | New |
Headers | show |
On Thu, Jul 25, 2013 at 05:31:58PM +0900, MORITA Kazutaka wrote: > If qemu_co_recv/send doesn't return the specified length, it means > that an error happened. > > Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> > --- > block/sheepdog.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) > > diff --git a/block/sheepdog.c b/block/sheepdog.c > index 6a41ad9..c6e9b89 100644 > --- a/block/sheepdog.c > +++ b/block/sheepdog.c > @@ -489,13 +489,13 @@ static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data, > int ret; > > ret = qemu_co_send(sockfd, hdr, sizeof(*hdr)); > - if (ret < sizeof(*hdr)) { > + if (ret != sizeof(*hdr)) { > error_report("failed to send a req, %s", strerror(errno)); > return ret; > } > > ret = qemu_co_send(sockfd, data, *wlen); > - if (ret < *wlen) { > + if (ret != *wlen) { > error_report("failed to send a req, %s", strerror(errno)); > } > > @@ -548,7 +548,7 @@ static coroutine_fn void do_co_req(void *opaque) > qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, have_co_req, co); > > ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr)); > - if (ret < sizeof(*hdr)) { > + if (ret != sizeof(*hdr)) { > error_report("failed to get a rsp, %s", strerror(errno)); > ret = -errno; > goto out; > @@ -560,7 +560,7 @@ static coroutine_fn void do_co_req(void *opaque) > > if (*rlen) { > ret = qemu_co_recv(sockfd, data, *rlen); > - if (ret < *rlen) { > + if (ret != *rlen) { > error_report("failed to get the data, %s", strerror(errno)); > ret = -errno; > goto out; > @@ -671,7 +671,7 @@ static void coroutine_fn aio_read_response(void *opaque) > > /* read a header */ > ret = qemu_co_recv(fd, &rsp, sizeof(rsp)); > - if (ret < 0) { > + if (ret != sizeof(rsp)) { > error_report("failed to get the header, %s", strerror(errno)); > goto out; > } > @@ -722,7 +722,7 @@ static void coroutine_fn aio_read_response(void *opaque) > case AIOCB_READ_UDATA: > ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov, > aio_req->iov_offset, rsp.data_length); > - if (ret < 0) { > + if (ret != rsp.data_length) { > error_report("failed to get the data, %s", strerror(errno)); > goto out; > } > @@ -1075,7 +1075,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, > > /* send a header */ > ret = qemu_co_send(s->fd, &hdr, sizeof(hdr)); > - if (ret < 0) { > + if (ret != sizeof(hdr)) { > qemu_co_mutex_unlock(&s->lock); > error_report("failed to send a req, %s", strerror(errno)); > return -errno; > @@ -1083,7 +1083,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, > > if (wlen) { > ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen); > - if (ret < 0) { > + if (ret != wlen) { > qemu_co_mutex_unlock(&s->lock); > error_report("failed to send a data, %s", strerror(errno)); > return -errno; These checks are wrong because signed int will be converted to unsgned int. E.g, ret = -1; (ret < sizeof(hdr)) will always be false, since -1 is converted to unsigned int. Thanks Yuan
At Thu, 25 Jul 2013 16:46:36 +0800, Liu Yuan wrote: > > On Thu, Jul 25, 2013 at 05:31:58PM +0900, MORITA Kazutaka wrote: > > If qemu_co_recv/send doesn't return the specified length, it means > > that an error happened. > > > > Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> > > --- > > block/sheepdog.c | 16 ++++++++-------- > > 1 file changed, 8 insertions(+), 8 deletions(-) > > > > diff --git a/block/sheepdog.c b/block/sheepdog.c > > index 6a41ad9..c6e9b89 100644 > > --- a/block/sheepdog.c > > +++ b/block/sheepdog.c > > @@ -489,13 +489,13 @@ static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data, > > int ret; > > > > ret = qemu_co_send(sockfd, hdr, sizeof(*hdr)); > > - if (ret < sizeof(*hdr)) { > > + if (ret != sizeof(*hdr)) { > > error_report("failed to send a req, %s", strerror(errno)); > > return ret; > > } > > > > ret = qemu_co_send(sockfd, data, *wlen); > > - if (ret < *wlen) { > > + if (ret != *wlen) { > > error_report("failed to send a req, %s", strerror(errno)); > > } > > > > @@ -548,7 +548,7 @@ static coroutine_fn void do_co_req(void *opaque) > > qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, have_co_req, co); > > > > ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr)); > > - if (ret < sizeof(*hdr)) { > > + if (ret != sizeof(*hdr)) { > > error_report("failed to get a rsp, %s", strerror(errno)); > > ret = -errno; > > goto out; > > @@ -560,7 +560,7 @@ static coroutine_fn void do_co_req(void *opaque) > > > > if (*rlen) { > > ret = qemu_co_recv(sockfd, data, *rlen); > > - if (ret < *rlen) { > > + if (ret != *rlen) { > > error_report("failed to get the data, %s", strerror(errno)); > > ret = -errno; > > goto out; > > @@ -671,7 +671,7 @@ static void coroutine_fn aio_read_response(void *opaque) > > > > /* read a header */ > > ret = qemu_co_recv(fd, &rsp, sizeof(rsp)); > > - if (ret < 0) { > > + if (ret != sizeof(rsp)) { > > error_report("failed to get the header, %s", strerror(errno)); > > goto out; > > } > > @@ -722,7 +722,7 @@ static void coroutine_fn aio_read_response(void *opaque) > > case AIOCB_READ_UDATA: > > ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov, > > aio_req->iov_offset, rsp.data_length); > > - if (ret < 0) { > > + if (ret != rsp.data_length) { > > error_report("failed to get the data, %s", strerror(errno)); > > goto out; > > } > > @@ -1075,7 +1075,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, > > > > /* send a header */ > > ret = qemu_co_send(s->fd, &hdr, sizeof(hdr)); > > - if (ret < 0) { > > + if (ret != sizeof(hdr)) { > > qemu_co_mutex_unlock(&s->lock); > > error_report("failed to send a req, %s", strerror(errno)); > > return -errno; > > @@ -1083,7 +1083,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, > > > > if (wlen) { > > ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen); > > - if (ret < 0) { > > + if (ret != wlen) { > > qemu_co_mutex_unlock(&s->lock); > > error_report("failed to send a data, %s", strerror(errno)); > > return -errno; > > These checks are wrong because signed int will be converted to unsgned int. E.g, > > ret = -1; > (ret < sizeof(hdr)) will always be false, since -1 is converted to unsigned int. Yes, that's the reason I replaced (ret < sizeof(hdr)) with (ret != sizeof(hdr)). ret = -1; (ret != sizeof(hdr)) will be true. Thanks, Kazutaka
On Thu, Jul 25, 2013 at 04:46:36PM +0800, Liu Yuan wrote: > On Thu, Jul 25, 2013 at 05:31:58PM +0900, MORITA Kazutaka wrote: > > If qemu_co_recv/send doesn't return the specified length, it means > > that an error happened. > > > > Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> > > --- > > block/sheepdog.c | 16 ++++++++-------- > > 1 file changed, 8 insertions(+), 8 deletions(-) > > > > diff --git a/block/sheepdog.c b/block/sheepdog.c > > index 6a41ad9..c6e9b89 100644 > > --- a/block/sheepdog.c > > +++ b/block/sheepdog.c > > @@ -489,13 +489,13 @@ static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data, > > int ret; > > > > ret = qemu_co_send(sockfd, hdr, sizeof(*hdr)); > > - if (ret < sizeof(*hdr)) { > > + if (ret != sizeof(*hdr)) { > > error_report("failed to send a req, %s", strerror(errno)); > > return ret; > > } > > > > ret = qemu_co_send(sockfd, data, *wlen); > > - if (ret < *wlen) { > > + if (ret != *wlen) { > > error_report("failed to send a req, %s", strerror(errno)); > > } > > > > @@ -548,7 +548,7 @@ static coroutine_fn void do_co_req(void *opaque) > > qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, have_co_req, co); > > > > ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr)); > > - if (ret < sizeof(*hdr)) { > > + if (ret != sizeof(*hdr)) { > > error_report("failed to get a rsp, %s", strerror(errno)); > > ret = -errno; > > goto out; > > @@ -560,7 +560,7 @@ static coroutine_fn void do_co_req(void *opaque) > > > > if (*rlen) { > > ret = qemu_co_recv(sockfd, data, *rlen); > > - if (ret < *rlen) { > > + if (ret != *rlen) { > > error_report("failed to get the data, %s", strerror(errno)); > > ret = -errno; > > goto out; > > @@ -671,7 +671,7 @@ static void coroutine_fn aio_read_response(void *opaque) > > > > /* read a header */ > > ret = qemu_co_recv(fd, &rsp, sizeof(rsp)); > > - if (ret < 0) { > > + if (ret != sizeof(rsp)) { > > error_report("failed to get the header, %s", strerror(errno)); > > goto out; > > } > > @@ -722,7 +722,7 @@ static void coroutine_fn aio_read_response(void *opaque) > > case AIOCB_READ_UDATA: > > ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov, > > aio_req->iov_offset, rsp.data_length); > > - if (ret < 0) { > > + if (ret != rsp.data_length) { > > error_report("failed to get the data, %s", strerror(errno)); > > goto out; > > } > > @@ -1075,7 +1075,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, > > > > /* send a header */ > > ret = qemu_co_send(s->fd, &hdr, sizeof(hdr)); > > - if (ret < 0) { > > + if (ret != sizeof(hdr)) { > > qemu_co_mutex_unlock(&s->lock); > > error_report("failed to send a req, %s", strerror(errno)); > > return -errno; > > @@ -1083,7 +1083,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, > > > > if (wlen) { > > ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen); > > - if (ret < 0) { > > + if (ret != wlen) { > > qemu_co_mutex_unlock(&s->lock); > > error_report("failed to send a data, %s", strerror(errno)); > > return -errno; > > These checks are wrong because signed int will be converted to unsgned int. E.g, > > ret = -1; > (ret < sizeof(hdr)) will always be false, since -1 is converted to unsigned int. Sorry, please ingnore this comment Thanks Yuan
diff --git a/block/sheepdog.c b/block/sheepdog.c index 6a41ad9..c6e9b89 100644 --- a/block/sheepdog.c +++ b/block/sheepdog.c @@ -489,13 +489,13 @@ static coroutine_fn int send_co_req(int sockfd, SheepdogReq *hdr, void *data, int ret; ret = qemu_co_send(sockfd, hdr, sizeof(*hdr)); - if (ret < sizeof(*hdr)) { + if (ret != sizeof(*hdr)) { error_report("failed to send a req, %s", strerror(errno)); return ret; } ret = qemu_co_send(sockfd, data, *wlen); - if (ret < *wlen) { + if (ret != *wlen) { error_report("failed to send a req, %s", strerror(errno)); } @@ -548,7 +548,7 @@ static coroutine_fn void do_co_req(void *opaque) qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, have_co_req, co); ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr)); - if (ret < sizeof(*hdr)) { + if (ret != sizeof(*hdr)) { error_report("failed to get a rsp, %s", strerror(errno)); ret = -errno; goto out; @@ -560,7 +560,7 @@ static coroutine_fn void do_co_req(void *opaque) if (*rlen) { ret = qemu_co_recv(sockfd, data, *rlen); - if (ret < *rlen) { + if (ret != *rlen) { error_report("failed to get the data, %s", strerror(errno)); ret = -errno; goto out; @@ -671,7 +671,7 @@ static void coroutine_fn aio_read_response(void *opaque) /* read a header */ ret = qemu_co_recv(fd, &rsp, sizeof(rsp)); - if (ret < 0) { + if (ret != sizeof(rsp)) { error_report("failed to get the header, %s", strerror(errno)); goto out; } @@ -722,7 +722,7 @@ static void coroutine_fn aio_read_response(void *opaque) case AIOCB_READ_UDATA: ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov, aio_req->iov_offset, rsp.data_length); - if (ret < 0) { + if (ret != rsp.data_length) { error_report("failed to get the data, %s", strerror(errno)); goto out; } @@ -1075,7 +1075,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, /* send a header */ ret = qemu_co_send(s->fd, &hdr, sizeof(hdr)); - if (ret < 0) { + if (ret != sizeof(hdr)) { qemu_co_mutex_unlock(&s->lock); error_report("failed to send a req, %s", strerror(errno)); return -errno; @@ -1083,7 +1083,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req, if (wlen) { ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen); - if (ret < 0) { + if (ret != wlen) { qemu_co_mutex_unlock(&s->lock); error_report("failed to send a data, %s", strerror(errno)); return -errno;
If qemu_co_recv/send doesn't return the specified length, it means that an error happened. Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> --- block/sheepdog.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)