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virtiofsd: Start queue threads

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Start a thread for each queue when we get notified it's been started.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
fix by:
Signed-off-by: Jun Piao <piaojun@huawei.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-06-13 20:17:51 +01:00
parent f2cef5fb9a
commit e4c55a3c14
1 changed files with 89 additions and 0 deletions
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89
tools/virtiofsd/fuse_virtio.c
View file

@ -11,6 +11,7 @@
* See the file COPYING.LIB
*/
#include "qemu/osdep.h"
#include "fuse_virtio.h"
#include "fuse_i.h"
#include "standard-headers/linux/fuse.h"
@ -30,6 +31,15 @@
#include "contrib/libvhost-user/libvhost-user.h"
struct fv_QueueInfo {
pthread_t thread;
struct fv_VuDev *virtio_dev;
/* Our queue index, corresponds to array position */
int qidx;
int kick_fd;
};
/*
* We pass the dev element into libvhost-user
* and then use it to get back to the outer
@ -38,6 +48,13 @@
struct fv_VuDev {
VuDev dev;
struct fuse_session *se;
/*
* The following pair of fields are only accessed in the main
* virtio_loop
*/
size_t nqueues;
struct fv_QueueInfo **qi;
};
/* From spec */
@ -83,6 +100,75 @@ static void fv_panic(VuDev *dev, const char *err)
exit(EXIT_FAILURE);
}
static void *fv_queue_thread(void *opaque)
{
struct fv_QueueInfo *qi = opaque;
fuse_log(FUSE_LOG_INFO, "%s: Start for queue %d kick_fd %d\n", __func__,
qi->qidx, qi->kick_fd);
while (1) {
/* TODO */
}
return NULL;
}
/* Callback from libvhost-user on start or stop of a queue */
static void fv_queue_set_started(VuDev *dev, int qidx, bool started)
{
struct fv_VuDev *vud = container_of(dev, struct fv_VuDev, dev);
struct fv_QueueInfo *ourqi;
fuse_log(FUSE_LOG_INFO, "%s: qidx=%d started=%d\n", __func__, qidx,
started);
assert(qidx >= 0);
/*
* Ignore additional request queues for now. passthrough_ll.c must be
* audited for thread-safety issues first. It was written with a
* well-behaved client in mind and may not protect against all types of
* races yet.
*/
if (qidx > 1) {
fuse_log(FUSE_LOG_ERR,
"%s: multiple request queues not yet implemented, please only "
"configure 1 request queue\n",
__func__);
exit(EXIT_FAILURE);
}
if (started) {
/* Fire up a thread to watch this queue */
if (qidx >= vud->nqueues) {
vud->qi = realloc(vud->qi, (qidx + 1) * sizeof(vud->qi[0]));
assert(vud->qi);
memset(vud->qi + vud->nqueues, 0,
sizeof(vud->qi[0]) * (1 + (qidx - vud->nqueues)));
vud->nqueues = qidx + 1;
}
if (!vud->qi[qidx]) {
vud->qi[qidx] = calloc(sizeof(struct fv_QueueInfo), 1);
assert(vud->qi[qidx]);
vud->qi[qidx]->virtio_dev = vud;
vud->qi[qidx]->qidx = qidx;
} else {
/* Shouldn't have been started */
assert(vud->qi[qidx]->kick_fd == -1);
}
ourqi = vud->qi[qidx];
ourqi->kick_fd = dev->vq[qidx].kick_fd;
if (pthread_create(&ourqi->thread, NULL, fv_queue_thread, ourqi)) {
fuse_log(FUSE_LOG_ERR, "%s: Failed to create thread for queue %d\n",
__func__, qidx);
assert(0);
}
} else {
/* TODO: Kill the thread */
assert(qidx < vud->nqueues);
ourqi = vud->qi[qidx];
ourqi->kick_fd = -1;
}
}
static bool fv_queue_order(VuDev *dev, int qidx)
{
return false;
@ -92,6 +178,9 @@ static const VuDevIface fv_iface = {
.get_features = fv_get_features,
.set_features = fv_set_features,
/* Don't need process message, we've not got any at vhost-user level */
.queue_set_started = fv_queue_set_started,
.queue_is_processed_in_order = fv_queue_order,
};