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-rw-r--r--Makefile3
-rw-r--r--Makefile.objs4
-rw-r--r--block.c12
-rw-r--r--block/curl.c6
-rw-r--r--block/iscsi.c3
-rw-r--r--block/nbd.c18
-rw-r--r--block/qcow.c4
-rw-r--r--block/qcow2.c21
-rw-r--r--block/qed.c10
-rw-r--r--block/rbd.c4
-rw-r--r--block/sheepdog.c6
-rw-r--r--cutils.c234
-rw-r--r--hw/9pfs/virtio-9p.c8
-rw-r--r--hw/rtl8139.c2
-rw-r--r--hw/usb/core.c6
-rw-r--r--hw/virtio-balloon.c4
-rw-r--r--hw/virtio-net.c4
-rw-r--r--hw/virtio-serial-bus.c10
-rw-r--r--iov.c192
-rw-r--r--iov.h77
-rw-r--r--linux-aio.c4
-rw-r--r--net.c2
-rw-r--r--posix-aio-compat.c8
-rw-r--r--qemu-common.h56
-rw-r--r--qemu-coroutine-io.c83
-rw-r--r--tests/Makefile2
-rw-r--r--tests/test-iov.c260
27 files changed, 623 insertions, 420 deletions
diff --git a/Makefile b/Makefile
index bad0e31..34d6a9e 100644
--- a/Makefile
+++ b/Makefile
@@ -156,7 +156,8 @@ vscclient$(EXESUF): $(libcacard-y) $(oslib-obj-y) $(trace-obj-y) qemu-timer-comm
qemu-img.o: qemu-img-cmds.h
tools-obj-y = $(oslib-obj-y) $(trace-obj-y) qemu-tool.o qemu-timer.o \
- qemu-timer-common.o main-loop.o notify.o iohandler.o cutils.o async.o
+ qemu-timer-common.o main-loop.o notify.o \
+ iohandler.o cutils.o iov.o async.o
tools-obj-$(CONFIG_POSIX) += compatfd.o
qemu-img$(EXESUF): qemu-img.o $(tools-obj-y) $(block-obj-y)
diff --git a/Makefile.objs b/Makefile.objs
index 625c4d5..5ebbcfa 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -41,7 +41,7 @@ coroutine-obj-$(CONFIG_WIN32) += coroutine-win32.o
#######################################################################
# block-obj-y is code used by both qemu system emulation and qemu-img
-block-obj-y = cutils.o cache-utils.o qemu-option.o module.o async.o
+block-obj-y = cutils.o iov.o cache-utils.o qemu-option.o module.o async.o
block-obj-y += nbd.o block.o aio.o aes.o qemu-config.o qemu-progress.o qemu-sockets.o
block-obj-y += $(coroutine-obj-y) $(qobject-obj-y) $(version-obj-y)
block-obj-$(CONFIG_POSIX) += posix-aio-compat.o
@@ -101,7 +101,7 @@ common-obj-$(CONFIG_SLIRP) += slirp/
user-obj-y =
user-obj-y += envlist.o path.o
user-obj-y += tcg-runtime.o host-utils.o
-user-obj-y += cutils.o cache-utils.o
+user-obj-y += cutils.o iov.o cache-utils.o
user-obj-y += module.o
user-obj-y += qemu-user.o
user-obj-y += $(trace-obj-y)
diff --git a/block.c b/block.c
index b410ed6..0c923f2 100644
--- a/block.c
+++ b/block.c
@@ -1871,8 +1871,8 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs,
}
skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE;
- qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes,
- nb_sectors * BDRV_SECTOR_SIZE);
+ qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes,
+ nb_sectors * BDRV_SECTOR_SIZE);
err:
qemu_vfree(bounce_buffer);
@@ -3200,13 +3200,13 @@ static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
// Add the first request to the merged one. If the requests are
// overlapping, drop the last sectors of the first request.
size = (reqs[i].sector - reqs[outidx].sector) << 9;
- qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
+ qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size);
// We should need to add any zeros between the two requests
assert (reqs[i].sector <= oldreq_last);
// Add the second request
- qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
+ qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size);
reqs[outidx].nb_sectors = qiov->size >> 9;
reqs[outidx].qiov = qiov;
@@ -3481,7 +3481,7 @@ static void bdrv_aio_bh_cb(void *opaque)
BlockDriverAIOCBSync *acb = opaque;
if (!acb->is_write)
- qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
+ qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size);
qemu_vfree(acb->bounce);
acb->common.cb(acb->common.opaque, acb->ret);
qemu_bh_delete(acb->bh);
@@ -3507,7 +3507,7 @@ static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
if (is_write) {
- qemu_iovec_to_buffer(acb->qiov, acb->bounce);
+ qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size);
acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
} else {
acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
diff --git a/block/curl.c b/block/curl.c
index bf3680b..e7c3634 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -140,8 +140,8 @@ static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
continue;
if ((s->buf_off >= acb->end)) {
- qemu_iovec_from_buffer(acb->qiov, s->orig_buf + acb->start,
- acb->end - acb->start);
+ qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
+ acb->end - acb->start);
acb->common.cb(acb->common.opaque, 0);
qemu_aio_release(acb);
s->acb[i] = NULL;
@@ -176,7 +176,7 @@ static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
{
char *buf = state->orig_buf + (start - state->buf_start);
- qemu_iovec_from_buffer(acb->qiov, buf, len);
+ qemu_iovec_from_buf(acb->qiov, 0, buf, len);
acb->common.cb(acb->common.opaque, 0);
return FIND_RET_OK;
diff --git a/block/iscsi.c b/block/iscsi.c
index ac65277..993a86d 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -247,8 +247,7 @@ iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
/* this will allow us to get rid of 'buf' completely */
size = nb_sectors * BDRV_SECTOR_SIZE;
acb->buf = g_malloc(size);
- qemu_iovec_to_buffer(acb->qiov, acb->buf);
-
+ qemu_iovec_to_buf(acb->qiov, 0, acb->buf, size);
acb->task = malloc(sizeof(struct scsi_task));
if (acb->task == NULL) {
diff --git a/block/nbd.c b/block/nbd.c
index 1212614..2bce47b 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -196,7 +196,7 @@ static void nbd_restart_write(void *opaque)
}
static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
- struct iovec *iov, int offset)
+ QEMUIOVector *qiov, int offset)
{
int rc, ret;
@@ -205,8 +205,9 @@ static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write,
nbd_have_request, s);
rc = nbd_send_request(s->sock, request);
- if (rc >= 0 && iov) {
- ret = qemu_co_sendv(s->sock, iov, request->len, offset);
+ if (rc >= 0 && qiov) {
+ ret = qemu_co_sendv(s->sock, qiov->iov, qiov->niov,
+ offset, request->len);
if (ret != request->len) {
return -EIO;
}
@@ -220,7 +221,7 @@ static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
static void nbd_co_receive_reply(BDRVNBDState *s, struct nbd_request *request,
struct nbd_reply *reply,
- struct iovec *iov, int offset)
+ QEMUIOVector *qiov, int offset)
{
int ret;
@@ -231,8 +232,9 @@ static void nbd_co_receive_reply(BDRVNBDState *s, struct nbd_request *request,
if (reply->handle != request->handle) {
reply->error = EIO;
} else {
- if (iov && reply->error == 0) {
- ret = qemu_co_recvv(s->sock, iov, request->len, offset);
+ if (qiov && reply->error == 0) {
+ ret = qemu_co_recvv(s->sock, qiov->iov, qiov->niov,
+ offset, request->len);
if (ret != request->len) {
reply->error = EIO;
}
@@ -349,7 +351,7 @@ static int nbd_co_readv_1(BlockDriverState *bs, int64_t sector_num,
if (ret < 0) {
reply.error = -ret;
} else {
- nbd_co_receive_reply(s, &request, &reply, qiov->iov, offset);
+ nbd_co_receive_reply(s, &request, &reply, qiov, offset);
}
nbd_coroutine_end(s, &request);
return -reply.error;
@@ -374,7 +376,7 @@ static int nbd_co_writev_1(BlockDriverState *bs, int64_t sector_num,
request.len = nb_sectors * 512;
nbd_coroutine_start(s, &request);
- ret = nbd_co_send_request(s, &request, qiov->iov, offset);
+ ret = nbd_co_send_request(s, &request, qiov, offset);
if (ret < 0) {
reply.error = -ret;
} else {
diff --git a/block/qcow.c b/block/qcow.c
index 35dff49..7b5ab87 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -540,7 +540,7 @@ done:
qemu_co_mutex_unlock(&s->lock);
if (qiov->niov > 1) {
- qemu_iovec_from_buffer(qiov, orig_buf, qiov->size);
+ qemu_iovec_from_buf(qiov, 0, orig_buf, qiov->size);
qemu_vfree(orig_buf);
}
@@ -569,7 +569,7 @@ static coroutine_fn int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
if (qiov->niov > 1) {
buf = orig_buf = qemu_blockalign(bs, qiov->size);
- qemu_iovec_to_buffer(qiov, buf);
+ qemu_iovec_to_buf(qiov, 0, buf, qiov->size);
} else {
orig_buf = NULL;
buf = (uint8_t *)qiov->iov->iov_base;
diff --git a/block/qcow2.c b/block/qcow2.c
index 5be5ace..870148d 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -508,7 +508,7 @@ int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
else
n1 = bs->total_sectors - sector_num;
- qemu_iovec_memset_skip(qiov, 0, 512 * (nb_sectors - n1), 512 * n1);
+ qemu_iovec_memset(qiov, 512 * n1, 0, 512 * (nb_sectors - n1));
return n1;
}
@@ -547,7 +547,7 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
index_in_cluster = sector_num & (s->cluster_sectors - 1);
qemu_iovec_reset(&hd_qiov);
- qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
+ qemu_iovec_concat(&hd_qiov, qiov, bytes_done,
cur_nr_sectors * 512);
switch (ret) {
@@ -569,7 +569,7 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
}
} else {
/* Note: in this case, no need to wait */
- qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors);
+ qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors);
}
break;
@@ -578,7 +578,7 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
ret = -EIO;
goto fail;
}
- qemu_iovec_memset(&hd_qiov, 0, 512 * cur_nr_sectors);
+ qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors);
break;
case QCOW2_CLUSTER_COMPRESSED:
@@ -588,7 +588,7 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
goto fail;
}
- qemu_iovec_from_buffer(&hd_qiov,
+ qemu_iovec_from_buf(&hd_qiov, 0,
s->cluster_cache + index_in_cluster * 512,
512 * cur_nr_sectors);
break;
@@ -628,11 +628,8 @@ static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num,
if (s->crypt_method) {
qcow2_encrypt_sectors(s, sector_num, cluster_data,
cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key);
- qemu_iovec_reset(&hd_qiov);
- qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
- cur_nr_sectors * 512);
- qemu_iovec_from_buffer(&hd_qiov, cluster_data,
- 512 * cur_nr_sectors);
+ qemu_iovec_from_buf(qiov, bytes_done,
+ cluster_data, 512 * cur_nr_sectors);
}
break;
@@ -721,7 +718,7 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
assert((cluster_offset & 511) == 0);
qemu_iovec_reset(&hd_qiov);
- qemu_iovec_copy(&hd_qiov, qiov, bytes_done,
+ qemu_iovec_concat(&hd_qiov, qiov, bytes_done,
cur_nr_sectors * 512);
if (s->crypt_method) {
@@ -732,7 +729,7 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
assert(hd_qiov.size <=
QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size);
- qemu_iovec_to_buffer(&hd_qiov, cluster_data);
+ qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size);
qcow2_encrypt_sectors(s, sector_num, cluster_data,
cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key);
diff --git a/block/qed.c b/block/qed.c
index dd2832a..5f3eefa 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -736,7 +736,7 @@ static void qed_read_backing_file(BDRVQEDState *s, uint64_t pos,
/* Zero all sectors if reading beyond the end of the backing file */
if (pos >= backing_length ||
pos + qiov->size > backing_length) {
- qemu_iovec_memset(qiov, 0, qiov->size);
+ qemu_iovec_memset(qiov, 0, 0, qiov->size);
}
/* Complete now if there are no backing file sectors to read */
@@ -1131,7 +1131,7 @@ static void qed_aio_write_alloc(QEDAIOCB *acb, size_t len)
acb->cur_nclusters = qed_bytes_to_clusters(s,
qed_offset_into_cluster(s, acb->cur_pos) + len);
- qemu_iovec_copy(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
+ qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
if (acb->flags & QED_AIOCB_ZERO) {
/* Skip ahead if the clusters are already zero */
@@ -1177,7 +1177,7 @@ static void qed_aio_write_inplace(QEDAIOCB *acb, uint64_t offset, size_t len)
/* Calculate the I/O vector */
acb->cur_cluster = offset;
- qemu_iovec_copy(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
+ qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
/* Do the actual write */
qed_aio_write_main(acb, 0);
@@ -1247,11 +1247,11 @@ static void qed_aio_read_data(void *opaque, int ret,
goto err;
}
- qemu_iovec_copy(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
+ qemu_iovec_concat(&acb->cur_qiov, acb->qiov, acb->qiov_offset, len);
/* Handle zero cluster and backing file reads */
if (ret == QED_CLUSTER_ZERO) {
- qemu_iovec_memset(&acb->cur_qiov, 0, acb->cur_qiov.size);
+ qemu_iovec_memset(&acb->cur_qiov, 0, 0, acb->cur_qiov.size);
qed_aio_next_io(acb, 0);
return;
} else if (ret != QED_CLUSTER_FOUND) {
diff --git a/block/rbd.c b/block/rbd.c
index eebc334..5a0f79f 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -639,7 +639,7 @@ static void rbd_aio_bh_cb(void *opaque)
RBDAIOCB *acb = opaque;
if (acb->cmd == RBD_AIO_READ) {
- qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
+ qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size);
}
qemu_vfree(acb->bounce);
acb->common.cb(acb->common.opaque, (acb->ret > 0 ? 0 : acb->ret));
@@ -693,7 +693,7 @@ static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
acb->bh = NULL;
if (cmd == RBD_AIO_WRITE) {
- qemu_iovec_to_buffer(acb->qiov, acb->bounce);
+ qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size);
}
buf = acb->bounce;
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 6e73efb..809df39 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -745,8 +745,8 @@ static void coroutine_fn aio_read_response(void *opaque)
}
break;
case AIOCB_READ_UDATA:
- ret = qemu_co_recvv(fd, acb->qiov->iov, rsp.data_length,
- aio_req->iov_offset);
+ ret = qemu_co_recvv(fd, acb->qiov->iov, acb->qiov->niov,
+ aio_req->iov_offset, rsp.data_length);
if (ret < 0) {
error_report("failed to get the data, %s", strerror(errno));
goto out;
@@ -1019,7 +1019,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
}
if (wlen) {
- ret = qemu_co_sendv(s->fd, iov, wlen, aio_req->iov_offset);
+ ret = qemu_co_sendv(s->fd, iov, niov, aio_req->iov_offset, wlen);
if (ret < 0) {
qemu_co_mutex_unlock(&s->lock);
error_report("failed to send a data, %s", strerror(errno));
diff --git a/cutils.c b/cutils.c
index af308cd..e2bc1b8 100644
--- a/cutils.c
+++ b/cutils.c
@@ -26,6 +26,7 @@
#include <math.h>
#include "qemu_socket.h"
+#include "iov.h"
void pstrcpy(char *buf, int buf_size, const char *str)
{
@@ -171,48 +172,34 @@ void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len)
}
/*
- * Copies iovecs from src to the end of dst. It starts copying after skipping
- * the given number of bytes in src and copies until src is completely copied
- * or the total size of the copied iovec reaches size.The size of the last
- * copied iovec is changed in order to fit the specified total size if it isn't
- * a perfect fit already.
+ * Concatenates (partial) iovecs from src to the end of dst.
+ * It starts copying after skipping `soffset' bytes at the
+ * beginning of src and adds individual vectors from src to
+ * dst copies up to `sbytes' bytes total, or up to the end
+ * of src if it comes first. This way, it is okay to specify
+ * very large value for `sbytes' to indicate "up to the end
+ * of src".
+ * Only vector pointers are processed, not the actual data buffers.
*/
-void qemu_iovec_copy(QEMUIOVector *dst, QEMUIOVector *src, uint64_t skip,
- size_t size)
+void qemu_iovec_concat(QEMUIOVector *dst,
+ QEMUIOVector *src, size_t soffset, size_t sbytes)
{
int i;
size_t done;
- void *iov_base;
- uint64_t iov_len;
-
+ struct iovec *siov = src->iov;
assert(dst->nalloc != -1);
-
- done = 0;
- for (i = 0; (i < src->niov) && (done != size); i++) {
- if (skip >= src->iov[i].iov_len) {
- /* Skip the whole iov */
- skip -= src->iov[i].iov_len;
- continue;
- } else {
- /* Skip only part (or nothing) of the iov */
- iov_base = (uint8_t*) src->iov[i].iov_base + skip;
- iov_len = src->iov[i].iov_len - skip;
- skip = 0;
- }
-
- if (done + iov_len > size) {
- qemu_iovec_add(dst, iov_base, size - done);
- break;
+ assert(src->size >= soffset);
+ for (i = 0, done = 0; done < sbytes && i < src->niov; i++) {
+ if (soffset < siov[i].iov_len) {
+ size_t len = MIN(siov[i].iov_len - soffset, sbytes - done);
+ qemu_iovec_add(dst, siov[i].iov_base + soffset, len);
+ done += len;
+ soffset = 0;
} else {
- qemu_iovec_add(dst, iov_base, iov_len);
+ soffset -= siov[i].iov_len;
}
- done += iov_len;
}
-}
-
-void qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t size)
-{
- qemu_iovec_copy(dst, src, 0, size);
+ /* return done; */
}
void qemu_iovec_destroy(QEMUIOVector *qiov)
@@ -233,74 +220,22 @@ void qemu_iovec_reset(QEMUIOVector *qiov)
qiov->size = 0;
}
-void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf)
+size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset,
+ void *buf, size_t bytes)
{
- uint8_t *p = (uint8_t *)buf;
- int i;
-
- for (i = 0; i < qiov->niov; ++i) {
- memcpy(p, qiov->iov[i].iov_base, qiov->iov[i].iov_len);
- p += qiov->iov[i].iov_len;
- }
+ return iov_to_buf(qiov->iov, qiov->niov, offset, buf, bytes);
}
-void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
+size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
+ const void *buf, size_t bytes)
{
- const uint8_t *p = (const uint8_t *)buf;
- size_t copy;
- int i;
-
- for (i = 0; i < qiov->niov && count; ++i) {
- copy = count;
- if (copy > qiov->iov[i].iov_len)
- copy = qiov->iov[i].iov_len;
- memcpy(qiov->iov[i].iov_base, p, copy);
- p += copy;
- count -= copy;
- }
+ return iov_from_buf(qiov->iov, qiov->niov, offset, buf, bytes);
}
-void qemu_iovec_memset(QEMUIOVector *qiov, int c, size_t count)
+size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
+ int fillc, size_t bytes)
{
- size_t n;
- int i;
-
- for (i = 0; i < qiov->niov && count; ++i) {
- n = MIN(count, qiov->iov[i].iov_len);
- memset(qiov->iov[i].iov_base, c, n);
- count -= n;
- }
-}
-
-void qemu_iovec_memset_skip(QEMUIOVector *qiov, int c, size_t count,
- size_t skip)
-{
- int i;
- size_t done;
- void *iov_base;
- uint64_t iov_len;
-
- done = 0;
- for (i = 0; (i < qiov->niov) && (done != count); i++) {
- if (skip >= qiov->iov[i].iov_len) {
- /* Skip the whole iov */
- skip -= qiov->iov[i].iov_len;
- continue;
- } else {
- /* Skip only part (or nothing) of the iov */
- iov_base = (uint8_t*) qiov->iov[i].iov_base + skip;
- iov_len = qiov->iov[i].iov_len - skip;
- skip = 0;
- }
-
- if (done + iov_len > count) {
- memset(iov_base, c, count - done);
- break;
- } else {
- memset(iov_base, c, iov_len);
- }
- done += iov_len;
- }
+ return iov_memset(qiov->iov, qiov->niov, offset, fillc, bytes);
}
/*
@@ -440,112 +375,3 @@ int qemu_parse_fd(const char *param)
}
return fd;
}
-
-/*
- * Send/recv data with iovec buffers
- *
- * This function send/recv data from/to the iovec buffer directly.
- * The first `offset' bytes in the iovec buffer are skipped and next
- * `len' bytes are used.
- *
- * For example,
- *
- * do_sendv_recvv(sockfd, iov, len, offset, 1);
- *
- * is equal to
- *
- * char *buf = malloc(size);
- * iov_to_buf(iov, iovcnt, buf, offset, size);
- * send(sockfd, buf, size, 0);
- * free(buf);
- */
-static int do_sendv_recvv(int sockfd, struct iovec *iov, int len, int offset,
- int do_sendv)
-{
- int ret, diff, iovlen;
- struct iovec *last_iov;
-
- /* last_iov is inclusive, so count from one. */
- iovlen = 1;
- last_iov = iov;
- len += offset;
-
- while (last_iov->iov_len < len) {
- len -= last_iov->iov_len;
-
- last_iov++;
- iovlen++;
- }
-
- diff = last_iov->iov_len - len;
- last_iov->iov_len -= diff;
-
- while (iov->iov_len <= offset) {
- offset -= iov->iov_len;
-
- iov++;
- iovlen--;
- }
-
- iov->iov_base = (char *) iov->iov_base + offset;
- iov->iov_len -= offset;
-
- {
-#if defined CONFIG_IOVEC && defined CONFIG_POSIX
- struct msghdr msg;
- memset(&msg, 0, sizeof(msg));
- msg.msg_iov = iov;
- msg.msg_iovlen = iovlen;
-
- do {
- if (do_sendv) {
- ret = sendmsg(sockfd, &msg, 0);
- } else {
- ret = recvmsg(sockfd, &msg, 0);
- }
- } while (ret == -1 && errno == EINTR);
-#else
- struct iovec *p = iov;
- ret = 0;
- while (iovlen > 0) {
- int rc;
- if (do_sendv) {
- rc = send(sockfd, p->iov_base, p->iov_len, 0);
- } else {
- rc = qemu_recv(sockfd, p->iov_base, p->iov_len, 0);
- }
- if (rc == -1) {
- if (errno == EINTR) {
- continue;
- }
- if (ret == 0) {
- ret = -1;
- }
- break;
- }
- if (rc == 0) {
- break;
- }
- ret += rc;
- iovlen--, p++;
- }
-#endif
- }
-
- /* Undo the changes above */
- iov->iov_base = (char *) iov->iov_base - offset;
- iov->iov_len += offset;
- last_iov->iov_len += diff;
- return ret;
-}
-
-int qemu_recvv(int sockfd, struct iovec *iov, int len, int iov_offset)
-{
- return do_sendv_recvv(sockfd, iov, len, iov_offset, 0);
-}
-
-int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset)
-{
- return do_sendv_recvv(sockfd, iov, len, iov_offset, 1);
-}
-
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index c633fb9..f4a7026 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -1648,7 +1648,7 @@ out:
* with qemu_iovec_destroy().
*/
static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
- uint64_t skip, size_t size,
+ size_t skip, size_t size,
bool is_write)
{
QEMUIOVector elem;
@@ -1665,7 +1665,7 @@ static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
qemu_iovec_init_external(&elem, iov, niov);
qemu_iovec_init(qiov, niov);
- qemu_iovec_copy(qiov, &elem, skip, size);
+ qemu_iovec_concat(qiov, &elem, skip, size);
}
static void v9fs_read(void *opaque)
@@ -1715,7 +1715,7 @@ static void v9fs_read(void *opaque)
qemu_iovec_init(&qiov, qiov_full.niov);
do {
qemu_iovec_reset(&qiov);
- qemu_iovec_copy(&qiov, &qiov_full, count, qiov_full.size - count);
+ qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count);
if (0) {
print_sg(qiov.iov, qiov.niov);
}
@@ -1970,7 +1970,7 @@ static void v9fs_write(void *opaque)
qemu_iovec_init(&qiov, qiov_full.niov);
do {
qemu_iovec_reset(&qiov);
- qemu_iovec_copy(&qiov, &qiov_full, total, qiov_full.size - total);
+ qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total);
if (0) {
print_sg(qiov.iov, qiov.niov);
}
diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 7b15047..436b015 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -1785,7 +1785,7 @@ static void rtl8139_transfer_frame(RTL8139State *s, uint8_t *buf, int size,
if (iov) {
buf2_size = iov_size(iov, 3);
buf2 = g_malloc(buf2_size);
- iov_to_buf(iov, 3, buf2, 0, buf2_size);
+ iov_to_buf(iov, 3, 0, buf2, buf2_size);
buf = buf2;
}
diff --git a/hw/usb/core.c b/hw/usb/core.c
index 0614f76..01a7622 100644
--- a/hw/usb/core.c
+++ b/hw/usb/core.c
@@ -522,10 +522,10 @@ void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes)
switch (p->pid) {
case USB_TOKEN_SETUP:
case USB_TOKEN_OUT:
- iov_to_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
+ iov_to_buf(p->iov.iov, p->iov.niov, p->result, ptr, bytes);
break;
case USB_TOKEN_IN:
- iov_from_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
+ iov_from_buf(p->iov.iov, p->iov.niov, p->result, ptr, bytes);
break;
default:
fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
@@ -539,7 +539,7 @@ void usb_packet_skip(USBPacket *p, size_t bytes)
assert(p->result >= 0);
assert(p->result + bytes <= p->iov.size);
if (p->pid == USB_TOKEN_IN) {
- iov_clear(p->iov.iov, p->iov.niov, p->result, bytes);
+ iov_memset(p->iov.iov, p->iov.niov, p->result, 0, bytes);
}
p->result += bytes;
}
diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index d048cef..dd1a650 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -77,7 +77,7 @@ static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq)
size_t offset = 0;
uint32_t pfn;
- while (iov_to_buf(elem.out_sg, elem.out_num, &pfn, offset, 4) == 4) {
+ while (iov_to_buf(elem.out_sg, elem.out_num, offset, &pfn, 4) == 4) {
ram_addr_t pa;
ram_addr_t addr;
@@ -118,7 +118,7 @@ static void virtio_balloon_receive_stats(VirtIODevice *vdev, VirtQueue *vq)
*/
reset_stats(s);
- while (iov_to_buf(elem->out_sg, elem->out_num, &stat, offset, sizeof(stat))
+ while (iov_to_buf(elem->out_sg, elem->out_num, offset, &stat, sizeof(stat))
== sizeof(stat)) {
uint16_t tag = tswap16(stat.tag);
uint64_t val = tswap64(stat.val);
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 3f190d4..533aa3d 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -656,8 +656,8 @@ static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_
}
/* copy in packet. ugh */
- len = iov_from_buf(sg, elem.in_num,
- buf + offset, 0, size - offset);
+ len = iov_from_buf(sg, elem.in_num, 0,
+ buf + offset, size - offset);
total += len;
offset += len;
/* If buffers can't be merged, at this point we
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 96382a4..82073f5 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -106,8 +106,8 @@ static size_t write_to_port(VirtIOSerialPort *port,
break;
}
- len = iov_from_buf(elem.in_sg, elem.in_num,
- buf + offset, 0, size - offset);
+ len = iov_from_buf(elem.in_sg, elem.in_num, 0,
+ buf + offset, size - offset);
offset += len;
virtqueue_push(vq, &elem, len);
@@ -454,7 +454,7 @@ static void control_out(VirtIODevice *vdev, VirtQueue *vq)
len = 0;
buf = NULL;
while (virtqueue_pop(vq, &elem)) {
- size_t cur_len, copied;
+ size_t cur_len;
cur_len = iov_size(elem.out_sg, elem.out_num);
/*
@@ -467,9 +467,9 @@ static void control_out(VirtIODevice *vdev, VirtQueue *vq)
buf = g_malloc(cur_len);
len = cur_len;
}
- copied = iov_to_buf(elem.out_sg, elem.out_num, buf, 0, len);
+ iov_to_buf(elem.out_sg, elem.out_num, 0, buf, cur_len);
- handle_control_message(vser, buf, copied);
+ handle_control_message(vser, buf, cur_len);
virtqueue_push(vq, &elem, 0);
}
g_free(buf);
diff --git a/iov.c b/iov.c
index 0f96493..7cc08f0 100644
--- a/iov.c
+++ b/iov.c
@@ -7,6 +7,7 @@
* Author(s):
* Anthony Liguori <aliguori@us.ibm.com>
* Amit Shah <amit.shah@redhat.com>
+ * Michael Tokarev <mjt@tls.msk.ru>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
@@ -17,75 +18,69 @@
#include "iov.h"
+#ifdef _WIN32
+# include <windows.h>
+# include <winsock2.h>
+#else
+# include <sys/types.h>
+# include <sys/socket.h>
+#endif
+
size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt,
- const void *buf, size_t iov_off, size_t size)
+ size_t offset, const void *buf, size_t bytes)
{
- size_t iovec_off, buf_off;
+ size_t done;
unsigned int i;
-
- iovec_off = 0;
- buf_off = 0;
- for (i = 0; i < iov_cnt && size; i++) {
- if (iov_off < (iovec_off + iov[i].iov_len)) {
- size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off, size);
-
- memcpy(iov[i].iov_base + (iov_off - iovec_off), buf + buf_off, len);
-
- buf_off += len;
- iov_off += len;
- size -= len;
+ for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) {
+ if (offset < iov[i].iov_len) {
+ size_t len = MIN(iov[i].iov_len - offset, bytes - done);
+ memcpy(iov[i].iov_base + offset, buf + done, len);
+ done += len;
+ offset = 0;
+ } else {
+ offset -= iov[i].iov_len;
}
- iovec_off += iov[i].iov_len;
}
- return buf_off;
+ assert(offset == 0);
+ return done;
}
size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
- void *buf, size_t iov_off, size_t size)
+ size_t offset, void *buf, size_t bytes)
{
- uint8_t *ptr;
- size_t iovec_off, buf_off;
+ size_t done;
unsigned int i;
-
- ptr = buf;
- iovec_off = 0;
- buf_off = 0;
- for (i = 0; i < iov_cnt && size; i++) {
- if (iov_off < (iovec_off + iov[i].iov_len)) {
- size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size);
-
- memcpy(ptr + buf_off, iov[i].iov_base + (iov_off - iovec_off), len);
-
- buf_off += len;
- iov_off += len;
- size -= len;
+ for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) {
+ if (offset < iov[i].iov_len) {
+ size_t len = MIN(iov[i].iov_len - offset, bytes - done);
+ memcpy(buf + done, iov[i].iov_base + offset, len);
+ done += len;
+ offset = 0;
+ } else {
+ offset -= iov[i].iov_len;
}
- iovec_off += iov[i].iov_len;
}
- return buf_off;
+ assert(offset == 0);
+ return done;
}
-size_t iov_clear(const struct iovec *iov, const unsigned int iov_cnt,
- size_t iov_off, size_t size)
+size_t iov_memset(const struct iovec *iov, const unsigned int iov_cnt,
+ size_t offset, int fillc, size_t bytes)
{
- size_t iovec_off, buf_off;
+ size_t done;
unsigned int i;
-
- iovec_off = 0;
- buf_off = 0;
- for (i = 0; i < iov_cnt && size; i++) {
- if (iov_off < (iovec_off + iov[i].iov_len)) {
- size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size);
-
- memset(iov[i].iov_base + (iov_off - iovec_off), 0, len);
-
- buf_off += len;
- iov_off += len;
- size -= len;
+ for (i = 0, done = 0; (offset || done < bytes) && i < iov_cnt; i++) {
+ if (offset < iov[i].iov_len) {
+ size_t len = MIN(iov[i].iov_len - offset, bytes - done);
+ memset(iov[i].iov_base + offset, fillc, len);
+ done += len;
+ offset = 0;
+ } else {
+ offset -= iov[i].iov_len;
}
- iovec_off += iov[i].iov_len;
}
- return buf_off;
+ assert(offset == 0);
+ return done;
}
size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt)
@@ -100,6 +95,101 @@ size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt)
return len;
}
+/* helper function for iov_send_recv() */
+static ssize_t
+do_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt, bool do_send)
+{
+#if defined CONFIG_IOVEC && defined CONFIG_POSIX
+ ssize_t ret;
+ struct msghdr msg;
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = iov;
+ msg.msg_iovlen = iov_cnt;
+ do {
+ ret = do_send
+ ? sendmsg(sockfd, &msg, 0)
+ : recvmsg(sockfd, &msg, 0);
+ } while (ret < 0 && errno == EINTR);
+ return ret;
+#else
+ /* else send piece-by-piece */
+ /*XXX Note: windows has WSASend() and WSARecv() */
+ unsigned i;
+ size_t count = 0;
+ for (i = 0; i < iov_cnt; ++i) {
+ ssize_t r = do_send
+ ? send(sockfd, iov[i].iov_base, iov[i].iov_len, 0)
+ : recv(sockfd, iov[i].iov_base, iov[i].iov_len, 0);
+ if (r > 0) {
+ ret += r;
+ } else if (!r) {
+ break;
+ } else if (errno == EINTR) {
+ continue;
+ } else {
+ /* else it is some "other" error,
+ * only return if there was no data processed. */
+ if (ret == 0) {
+ return -1;
+ }
+ break;
+ }
+ }
+ return count;
+#endif
+}
+
+ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
+ size_t offset, size_t bytes,
+ bool do_send)
+{
+ ssize_t ret;
+ unsigned si, ei; /* start and end indexes */
+
+ /* Find the start position, skipping `offset' bytes:
+ * first, skip all full-sized vector elements, */
+ for (si = 0; si < iov_cnt && offset >= iov[si].iov_len; ++si) {
+ offset -= iov[si].iov_len;
+ }
+ if (offset) {
+ assert(si < iov_cnt);
+ /* second, skip `offset' bytes from the (now) first element,
+ * undo it on exit */
+ iov[si].iov_base += offset;
+ iov[si].iov_len -= offset;
+ }
+ /* Find the end position skipping `bytes' bytes: */
+ /* first, skip all full-sized elements */
+ for (ei = si; ei < iov_cnt && iov[ei].iov_len <= bytes; ++ei) {
+ bytes -= iov[ei].iov_len;
+ }
+ if (bytes) {
+ /* second, fixup the last element, and remember
+ * the length we've cut from the end of it in `bytes' */
+ size_t tail;
+ assert(ei < iov_cnt);
+ assert(iov[ei].iov_len > bytes);
+ tail = iov[ei].iov_len - bytes;
+ iov[ei].iov_len = bytes;
+ bytes = tail; /* bytes is now equal to the tail size */
+ ++ei;
+ }
+
+ ret = do_send_recv(sockfd, iov + si, ei - si, do_send);
+
+ /* Undo the changes above */
+ if (offset) {
+ iov[si].iov_base -= offset;
+ iov[si].iov_len += offset;
+ }
+ if (bytes) {
+ iov[ei-1].iov_len += bytes;
+ }
+
+ return ret;
+}
+
+
void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt,
FILE *fp, const char *prefix, size_t limit)
{
diff --git a/iov.h b/iov.h
index 94d2f78..381f37a 100644
--- a/iov.h
+++ b/iov.h
@@ -1,10 +1,11 @@
/*
- * Helpers for getting linearized buffers from iov / filling buffers into iovs
+ * Helpers for using (partial) iovecs.
*
* Copyright (C) 2010 Red Hat, Inc.
*
* Author(s):
* Amit Shah <amit.shah@redhat.com>
+ * Michael Tokarev <mjt@tls.msk.ru>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
@@ -12,12 +13,76 @@
#include "qemu-common.h"
+/**
+ * count and return data size, in bytes, of an iovec
+ * starting at `iov' of `iov_cnt' number of elements.
+ */
+size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt);
+
+/**
+ * Copy from single continuous buffer to scatter-gather vector of buffers
+ * (iovec) and back like memcpy() between two continuous memory regions.
+ * Data in single continuous buffer starting at address `buf' and
+ * `bytes' bytes long will be copied to/from an iovec `iov' with
+ * `iov_cnt' number of elements, starting at byte position `offset'
+ * within the iovec. If the iovec does not contain enough space,
+ * only part of data will be copied, up to the end of the iovec.
+ * Number of bytes actually copied will be returned, which is
+ * min(bytes, iov_size(iov)-offset)
+ * `Offset' must point to the inside of iovec.
+ * It is okay to use very large value for `bytes' since we're
+ * limited by the size of the iovec anyway, provided that the
+ * buffer pointed to by buf has enough space. One possible
+ * such "large" value is -1 (sinice size_t is unsigned),
+ * so specifying `-1' as `bytes' means 'up to the end of iovec'.
+ */
size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt,
- const void *buf, size_t iov_off, size_t size);
+ size_t offset, const void *buf, size_t bytes);
size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt,
- void *buf, size_t iov_off, size_t size);
-size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt);
-size_t iov_clear(const struct iovec *iov, const unsigned int iov_cnt,
- size_t iov_off, size_t size);
+ size_t offset, void *buf, size_t bytes);
+
+/**
+ * Set data bytes pointed out by iovec `iov' of size `iov_cnt' elements,
+ * starting at byte offset `start', to value `fillc', repeating it
+ * `bytes' number of times. `Offset' must point to the inside of iovec.
+ * If `bytes' is large enough, only last bytes portion of iovec,
+ * up to the end of it, will be filled with the specified value.
+ * Function return actual number of bytes processed, which is
+ * min(size, iov_size(iov) - offset).
+ * Again, it is okay to use large value for `bytes' to mean "up to the end".
+ */
+size_t iov_memset(const struct iovec *iov, const unsigned int iov_cnt,
+ size_t offset, int fillc, size_t bytes);
+
+/*
+ * Send/recv data from/to iovec buffers directly
+ *
+ * `offset' bytes in the beginning of iovec buffer are skipped and
+ * next `bytes' bytes are used, which must be within data of iovec.
+ *
+ * r = iov_send_recv(sockfd, iov, iovcnt, offset, bytes, true);
+ *
+ * is logically equivalent to
+ *
+ * char *buf = malloc(bytes);
+ * iov_to_buf(iov, iovcnt, offset, buf, bytes);
+ * r = send(sockfd, buf, bytes, 0);
+ * free(buf);
+ *
+ * For iov_send_recv() _whole_ area being sent or received
+ * should be within the iovec, not only beginning of it.
+ */
+ssize_t iov_send_recv(int sockfd, struct iovec *iov, unsigned iov_cnt,
+ size_t offset, size_t bytes, bool do_send);
+#define iov_recv(sockfd, iov, iov_cnt, offset, bytes) \
+ iov_send_recv(sockfd, iov, iov_cnt, offset, bytes, false)
+#define iov_send(sockfd, iov, iov_cnt, offset, bytes) \
+ iov_send_recv(sockfd, iov, iov_cnt, offset, bytes, true)
+
+/**
+ * Produce a text hexdump of iovec `iov' with `iov_cnt' number of elements
+ * in file `fp', prefixing each line with `prefix' and processing not more
+ * than `limit' data bytes.
+ */
void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt,
FILE *fp, const char *prefix, size_t limit);
diff --git a/linux-aio.c b/linux-aio.c
index fa0fbf3..ce9b5d4 100644
--- a/linux-aio.c
+++ b/linux-aio.c
@@ -63,8 +63,8 @@ static void qemu_laio_process_completion(struct qemu_laio_state *s,
} else if (ret >= 0) {
/* Short reads mean EOF, pad with zeros. */
if (laiocb->is_read) {
- qemu_iovec_memset_skip(laiocb->qiov, 0,
- laiocb->qiov->size - ret, ret);
+ qemu_iovec_memset(laiocb->qiov, ret, 0,
+ laiocb->qiov->size - ret);
} else {
ret = -EINVAL;
}
diff --git a/net.c b/net.c
index 4aa416c..abf0fd0 100644
--- a/net.c
+++ b/net.c
@@ -544,7 +544,7 @@ static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,
uint8_t buffer[4096];
size_t offset;
- offset = iov_to_buf(iov, iovcnt, buffer, 0, sizeof(buffer));
+ offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
return vc->info->receive(vc, buffer, offset);
}
diff --git a/posix-aio-compat.c b/posix-aio-compat.c
index 68361f5..96e4daf 100644
--- a/posix-aio-compat.c
+++ b/posix-aio-compat.c
@@ -29,6 +29,7 @@
#include "qemu-common.h"
#include "trace.h"
#include "block_int.h"
+#include "iov.h"
#include "block/raw-posix-aio.h"
@@ -351,11 +352,8 @@ static void *aio_thread(void *unused)
if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->common.bs->growable) {
/* A short read means that we have reached EOF. Pad the buffer
* with zeros for bytes after EOF. */
- QEMUIOVector qiov;
-
- qemu_iovec_init_external(&qiov, aiocb->aio_iov,
- aiocb->aio_niov);
- qemu_iovec_memset_skip(&qiov, 0, aiocb->aio_nbytes - ret, ret);
+ iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
+ 0, aiocb->aio_nbytes - ret);
ret = aiocb->aio_nbytes;
}
diff --git a/qemu-common.h b/qemu-common.h
index c8c6b2a..09676f5 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -206,9 +206,6 @@ int qemu_pipe(int pipefd[2]);
#define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
#endif
-int qemu_recvv(int sockfd, struct iovec *iov, int len, int iov_offset);
-int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset);
-
/* Error handling. */
void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
@@ -312,32 +309,29 @@ struct qemu_work_item {
void qemu_init_vcpu(void *env);
#endif
-/**
- * Sends an iovec (or optionally a part of it) down a socket, yielding
- * when the socket is full.
- */
-int qemu_co_sendv(int sockfd, struct iovec *iov,
- int len, int iov_offset);
-
-/**
- * Receives data into an iovec (or optionally into a part of it) from
- * a socket, yielding when there is no data in the socket.
- */
-int qemu_co_recvv(int sockfd, struct iovec *iov,
- int len, int iov_offset);
-
/**
- * Sends a buffer down a socket, yielding when the socket is full.
+ * Sends a (part of) iovec down a socket, yielding when the socket is full, or
+ * Receives data into a (part of) iovec from a socket,
+ * yielding when there is no data in the socket.
+ * The same interface as qemu_sendv_recvv(), with added yielding.
+ * XXX should mark these as coroutine_fn
*/
-int qemu_co_send(int sockfd, void *buf, int len);
+ssize_t qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt,
+ size_t offset, size_t bytes, bool do_send);
+#define qemu_co_recvv(sockfd, iov, iov_cnt, offset, bytes) \
+ qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, false)
+#define qemu_co_sendv(sockfd, iov, iov_cnt, offset, bytes) \
+ qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, true)
/**
- * Receives data into a buffer from a socket, yielding when there
- * is no data in the socket.
+ * The same as above, but with just a single buffer
*/
-int qemu_co_recv(int sockfd, void *buf, int len);
-
+ssize_t qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send);
+#define qemu_co_recv(sockfd, buf, bytes) \
+ qemu_co_send_recv(sockfd, buf, bytes, false)
+#define qemu_co_send(sockfd, buf, bytes) \
+ qemu_co_send_recv(sockfd, buf, bytes, true)
typedef struct QEMUIOVector {
struct iovec *iov;
@@ -349,16 +343,16 @@ typedef struct QEMUIOVector {
void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint);
void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov);
void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len);
-void qemu_iovec_copy(QEMUIOVector *dst, QEMUIOVector *src, uint64_t skip,
- size_t size);
-void qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t size);
+void qemu_iovec_concat(QEMUIOVector *dst,
+ QEMUIOVector *src, size_t soffset, size_t sbytes);
void qemu_iovec_destroy(QEMUIOVector *qiov);
void qemu_iovec_reset(QEMUIOVector *qiov);
-void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf);
-void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count);
-void qemu_iovec_memset(QEMUIOVector *qiov, int c, size_t count);
-void qemu_iovec_memset_skip(QEMUIOVector *qiov, int c, size_t count,
- size_t skip);
+size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset,
+ void *buf, size_t bytes);
+size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
+ const void *buf, size_t bytes);
+size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
+ int fillc, size_t bytes);
bool buffer_is_zero(const void *buf, size_t len);
diff --git a/qemu-coroutine-io.c b/qemu-coroutine-io.c
index 40fd514..5734965 100644
--- a/qemu-coroutine-io.c
+++ b/qemu-coroutine-io.c
@@ -25,72 +25,41 @@
#include "qemu-common.h"
#include "qemu_socket.h"
#include "qemu-coroutine.h"
+#include "iov.h"
-int coroutine_fn qemu_co_recvv(int sockfd, struct iovec *iov,
- int len, int iov_offset)
+ssize_t coroutine_fn
+qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt,
+ size_t offset, size_t bytes, bool do_send)
{
- int total = 0;
- int ret;
- while (len) {
- ret = qemu_recvv(sockfd, iov, len, iov_offset + total);
- if (ret < 0) {
+ size_t done = 0;
+ ssize_t ret;
+ while (done < bytes) {
+ ret = iov_send_recv(sockfd, iov, iov_cnt,
+ offset + done, bytes - done, do_send);
+ if (ret > 0) {
+ done += ret;
+ } else if (ret < 0) {
if (errno == EAGAIN) {
qemu_coroutine_yield();
- continue;
- }
- if (total == 0) {
- total = -1;
- }
- break;
- }
- if (ret == 0) {
- break;
- }
- total += ret, len -= ret;
- }
-
- return total;
-}
-
-int coroutine_fn qemu_co_sendv(int sockfd, struct iovec *iov,
- int len, int iov_offset)
-{
- int total = 0;
- int ret;
- while (len) {
- ret = qemu_sendv(sockfd, iov, len, iov_offset + total);
- if (ret < 0) {
- if (errno == EAGAIN) {
- qemu_coroutine_yield();
- continue;
- }
- if (total == 0) {
- total = -1;
+ } else if (done == 0) {
+ return -1;
+ } else {
+ break;
}
+ } else if (ret == 0 && !do_send) {
+ /* write (send) should never return 0.
+ * read (recv) returns 0 for end-of-file (-data).
+ * In both cases there's little point retrying,
+ * but we do for write anyway, just in case */
break;
}
- total += ret, len -= ret;
}
-
- return total;
+ return done;
}
-int coroutine_fn qemu_co_recv(int sockfd, void *buf, int len)
+ssize_t coroutine_fn
+qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send)
{
- struct iovec iov;
-
- iov.iov_base = buf;
- iov.iov_len = len;
-
- return qemu_co_recvv(sockfd, &iov, len, 0);
-}
-
-int coroutine_fn qemu_co_send(int sockfd, void *buf, int len)
-{
- struct iovec iov;
-
- iov.iov_base = buf;
- iov.iov_len = len;
-
- return qemu_co_sendv(sockfd, &iov, len, 0);
+ struct iovec iov = { .iov_base = buf, .iov_len = bytes };
+ return qemu_co_sendv_recvv(sockfd, &iov, 1, 0, bytes, do_send);
}
diff --git a/tests/Makefile b/tests/Makefile
index d66ab19..d687ecc 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -14,6 +14,7 @@ check-unit-y += tests/test-string-input-visitor$(EXESUF)
check-unit-y += tests/test-string-output-visitor$(EXESUF)
check-unit-y += tests/test-coroutine$(EXESUF)
check-unit-y += tests/test-visitor-serialization$(EXESUF)
+check-unit-y += tests/test-iov$(EXESUF)
check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
@@ -47,6 +48,7 @@ tests/check-qlist$(EXESUF): tests/check-qlist.o qlist.o qint.o $(tools-obj-y)
tests/check-qfloat$(EXESUF): tests/check-qfloat.o qfloat.o $(tools-obj-y)
tests/check-qjson$(EXESUF): tests/check-qjson.o $(qobject-obj-y) $(tools-obj-y)
tests/test-coroutine$(EXESUF): tests/test-coroutine.o $(coroutine-obj-y) $(tools-obj-y)
+tests/test-iov$(EXESUF): tests/test-iov.o iov.o
tests/test-qapi-types.c tests/test-qapi-types.h :\
$(SRC_PATH)/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-types.py
diff --git a/tests/test-iov.c b/tests/test-iov.c
new file mode 100644
index 0000000..cbe7a89
--- /dev/null
+++ b/tests/test-iov.c
@@ -0,0 +1,260 @@
+#include <glib.h>
+#include "qemu-common.h"
+#include "iov.h"
+#include "qemu_socket.h"
+
+/* create a randomly-sized iovec with random vectors */
+static void iov_random(struct iovec **iovp, unsigned *iov_cntp)
+{
+ unsigned niov = g_test_rand_int_range(3,8);
+ struct iovec *iov = g_malloc(niov * sizeof(*iov));
+ unsigned i;
+ for (i = 0; i < niov; ++i) {
+ iov[i].iov_len = g_test_rand_int_range(5,20);
+ iov[i].iov_base = g_malloc(iov[i].iov_len);
+ }
+ *iovp = iov;
+ *iov_cntp = niov;
+}
+
+static void iov_free(struct iovec *iov, unsigned niov)
+{
+ unsigned i;
+ for (i = 0; i < niov; ++i) {
+ g_free(iov[i].iov_base);
+ }
+ g_free(iov);
+}
+
+static void test_iov_bytes(struct iovec *iov, unsigned niov,
+ size_t offset, size_t bytes)
+{
+ unsigned i;
+ size_t j, o;
+ unsigned char *b;
+ o = 0;
+
+ /* we walk over all elements, */
+ for (i = 0; i < niov; ++i) {
+ b = iov[i].iov_base;
+ /* over each char of each element, */
+ for (j = 0; j < iov[i].iov_len; ++j) {
+ /* counting each of them and
+ * verifying that the ones within [offset,offset+bytes)
+ * range are equal to the position number (o) */
+ if (o >= offset && o < offset + bytes) {
+ g_assert(b[j] == (o & 255));
+ } else {
+ g_assert(b[j] == 0xff);
+ }
+ ++o;
+ }
+ }
+}
+
+static void test_to_from_buf_1(void)
+{
+ unsigned niov;
+ struct iovec *iov;
+ size_t sz;
+ unsigned char *ibuf, *obuf;
+ unsigned i, j, n;
+
+ iov_random(&iov, &niov);
+
+ sz = iov_size(iov, niov);
+
+ ibuf = g_malloc(sz + 8) + 4;
+ memcpy(ibuf-4, "aaaa", 4); memcpy(ibuf + sz, "bbbb", 4);
+ obuf = g_malloc(sz + 8) + 4;
+ memcpy(obuf-4, "xxxx", 4); memcpy(obuf + sz, "yyyy", 4);
+
+ /* fill in ibuf with 0123456... */
+ for (i = 0; i < sz; ++i) {
+ ibuf[i] = i & 255;
+ }
+
+ for (i = 0; i <= sz; ++i) {
+
+ /* Test from/to buf for offset(i) in [0..sz] up to the end of buffer.
+ * For last iteration with offset == sz, the procedure should
+ * skip whole vector and process exactly 0 bytes */
+
+ /* first set bytes [i..sz) to some "random" value */
+ n = iov_memset(iov, niov, 0, 0xff, -1);
+ g_assert(n == sz);
+
+ /* next copy bytes [i..sz) from ibuf to iovec */
+ n = iov_from_buf(iov, niov, i, ibuf + i, -1);
+ g_assert(n == sz - i);
+
+ /* clear part of obuf */
+ memset(obuf + i, 0, sz - i);
+ /* and set this part of obuf to values from iovec */
+ n = iov_to_buf(iov, niov, i, obuf + i, -1);
+ g_assert(n == sz - i);
+
+ /* now compare resulting buffers */
+ g_assert(memcmp(ibuf, obuf, sz) == 0);
+
+ /* test just one char */
+ n = iov_to_buf(iov, niov, i, obuf + i, 1);
+ g_assert(n == (i < sz));
+ if (n) {
+ g_assert(obuf[i] == (i & 255));
+ }
+
+ for (j = i; j <= sz; ++j) {
+ /* now test num of bytes cap up to byte no. j,
+ * with j in [i..sz]. */
+
+ /* clear iovec */
+ n = iov_memset(iov, niov, 0, 0xff, -1);
+ g_assert(n == sz);
+
+ /* copy bytes [i..j) from ibuf to iovec */
+ n = iov_from_buf(iov, niov, i, ibuf + i, j - i);
+ g_assert(n == j - i);
+
+ /* clear part of obuf */
+ memset(obuf + i, 0, j - i);
+
+ /* copy bytes [i..j) from iovec to obuf */
+ n = iov_to_buf(iov, niov, i, obuf + i, j - i);
+ g_assert(n == j - i);
+
+ /* verify result */
+ g_assert(memcmp(ibuf, obuf, sz) == 0);
+
+ /* now actually check if the iovec contains the right data */
+ test_iov_bytes(iov, niov, i, j - i);
+ }
+ }
+ g_assert(!memcmp(ibuf-4, "aaaa", 4) && !memcmp(ibuf+sz, "bbbb", 4));
+ g_free(ibuf-4);
+ g_assert(!memcmp(obuf-4, "xxxx", 4) && !memcmp(obuf+sz, "yyyy", 4));
+ g_free(obuf-4);
+ iov_free(iov, niov);
+}
+
+static void test_to_from_buf(void)
+{
+ int x;
+ for (x = 0; x < 4; ++x) {
+ test_to_from_buf_1();
+ }
+}
+
+static void test_io(void)
+{
+#ifndef _WIN32
+/* socketpair(PF_UNIX) which does not exist on windows */
+
+ int sv[2];
+ int r;
+ unsigned i, j, k, s, t;
+ fd_set fds;
+ unsigned niov;
+ struct iovec *iov, *siov;
+ unsigned char *buf;
+ size_t sz;
+
+ iov_random(&iov, &niov);
+ sz = iov_size(iov, niov);
+ buf = g_malloc(sz);
+ for (i = 0; i < sz; ++i) {
+ buf[i] = i & 255;
+ }
+ iov_from_buf(iov, niov, 0, buf, sz);
+
+ siov = g_malloc(sizeof(*iov) * niov);
+ memcpy(siov, iov, sizeof(*iov) * niov);
+
+ if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) < 0) {
+ perror("socketpair");
+ exit(1);
+ }
+
+ FD_ZERO(&fds);
+
+ t = 0;
+ if (fork() == 0) {
+ /* writer */
+
+ close(sv[0]);
+ FD_SET(sv[1], &fds);
+ fcntl(sv[1], F_SETFL, O_RDWR|O_NONBLOCK);
+ r = g_test_rand_int_range(sz / 2, sz);
+ setsockopt(sv[1], SOL_SOCKET, SO_SNDBUF, &r, sizeof(r));
+
+ for (i = 0; i <= sz; ++i) {
+ for (j = i; j <= sz; ++j) {
+ k = i;
+ do {
+ s = g_test_rand_int_range(0, j - k + 1);
+ r = iov_send(sv[1], iov, niov, k, s);
+ g_assert(memcmp(iov, siov, sizeof(*iov)*niov) == 0);
+ if (r >= 0) {
+ k += r;
+ t += r;
+ usleep(g_test_rand_int_range(0, 30));
+ } else if (errno == EAGAIN) {
+ select(sv[1]+1, NULL, &fds, NULL, NULL);
+ continue;
+ } else {
+ perror("send");
+ exit(1);
+ }
+ } while(k < j);
+ }
+ }
+ exit(0);
+
+ } else {
+ /* reader & verifier */
+
+ close(sv[1]);
+ FD_SET(sv[0], &fds);
+ fcntl(sv[0], F_SETFL, O_RDWR|O_NONBLOCK);
+ r = g_test_rand_int_range(sz / 2, sz);
+ setsockopt(sv[0], SOL_SOCKET, SO_RCVBUF, &r, sizeof(r));
+ usleep(500000);
+
+ for (i = 0; i <= sz; ++i) {
+ for (j = i; j <= sz; ++j) {
+ k = i;
+ iov_memset(iov, niov, 0, 0xff, -1);
+ do {
+ s = g_test_rand_int_range(0, j - k + 1);
+ r = iov_recv(sv[0], iov, niov, k, s);
+ g_assert(memcmp(iov, siov, sizeof(*iov)*niov) == 0);
+ if (r > 0) {
+ k += r;
+ t += r;
+ } else if (!r) {
+ if (s) {
+ break;
+ }
+ } else if (errno == EAGAIN) {
+ select(sv[0]+1, &fds, NULL, NULL, NULL);
+ continue;
+ } else {
+ perror("recv");
+ exit(1);
+ }
+ } while(k < j);
+ test_iov_bytes(iov, niov, i, j - i);
+ }
+ }
+ }
+#endif
+}
+
+int main(int argc, char **argv)
+{
+ g_test_init(&argc, &argv, NULL);
+ g_test_rand_int();
+ g_test_add_func("/basic/iov/from-to-buf", test_to_from_buf);
+ g_test_add_func("/basic/iov/io", test_io);
+ return g_test_run();
+}
generated by cgit v1.1 at 2024-12-23 15:46:04 +0000