|
 |
1d442b |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
|
|
|
1d442b |
Date: Mon, 27 Jan 2020 19:01:01 +0000
|
|
|
1d442b |
Subject: [PATCH] virtiofsd: Poll kick_fd for queue
|
|
|
1d442b |
MIME-Version: 1.0
|
|
|
1d442b |
Content-Type: text/plain; charset=UTF-8
|
|
|
1d442b |
Content-Transfer-Encoding: 8bit
|
|
|
1d442b |
|
|
|
1d442b |
In the queue thread poll the kick_fd we're passed.
|
|
|
1d442b |
|
|
|
1d442b |
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
1d442b |
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
|
|
1d442b |
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
1d442b |
(cherry picked from commit 5dcd1f56141378226d33dc3df68ec57913e0aa04)
|
|
|
1d442b |
---
|
|
|
1d442b |
tools/virtiofsd/fuse_virtio.c | 40 ++++++++++++++++++++++++++++++++++-
|
|
|
1d442b |
1 file changed, 39 insertions(+), 1 deletion(-)
|
|
|
1d442b |
|
|
|
1d442b |
diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c
|
|
|
1d442b |
index 2a94bb3cca..05e7258712 100644
|
|
|
1d442b |
--- a/tools/virtiofsd/fuse_virtio.c
|
|
|
1d442b |
+++ b/tools/virtiofsd/fuse_virtio.c
|
|
|
1d442b |
@@ -24,6 +24,7 @@
|
|
|
1d442b |
#include <stdio.h>
|
|
|
1d442b |
#include <stdlib.h>
|
|
|
1d442b |
#include <string.h>
|
|
|
1d442b |
+#include <sys/eventfd.h>
|
|
|
1d442b |
#include <sys/socket.h>
|
|
|
1d442b |
#include <sys/types.h>
|
|
|
1d442b |
#include <sys/un.h>
|
|
|
1d442b |
@@ -100,13 +101,50 @@ static void fv_panic(VuDev *dev, const char *err)
|
|
|
1d442b |
exit(EXIT_FAILURE);
|
|
|
1d442b |
}
|
|
|
1d442b |
|
|
|
1d442b |
+/* Thread function for individual queues, created when a queue is 'started' */
|
|
|
1d442b |
static void *fv_queue_thread(void *opaque)
|
|
|
1d442b |
{
|
|
|
1d442b |
struct fv_QueueInfo *qi = opaque;
|
|
|
1d442b |
fuse_log(FUSE_LOG_INFO, "%s: Start for queue %d kick_fd %d\n", __func__,
|
|
|
1d442b |
qi->qidx, qi->kick_fd);
|
|
|
1d442b |
while (1) {
|
|
|
1d442b |
- /* TODO */
|
|
|
1d442b |
+ struct pollfd pf[1];
|
|
|
1d442b |
+ pf[0].fd = qi->kick_fd;
|
|
|
1d442b |
+ pf[0].events = POLLIN;
|
|
|
1d442b |
+ pf[0].revents = 0;
|
|
|
1d442b |
+
|
|
|
1d442b |
+ fuse_log(FUSE_LOG_DEBUG, "%s: Waiting for Queue %d event\n", __func__,
|
|
|
1d442b |
+ qi->qidx);
|
|
|
1d442b |
+ int poll_res = ppoll(pf, 1, NULL, NULL);
|
|
|
1d442b |
+
|
|
|
1d442b |
+ if (poll_res == -1) {
|
|
|
1d442b |
+ if (errno == EINTR) {
|
|
|
1d442b |
+ fuse_log(FUSE_LOG_INFO, "%s: ppoll interrupted, going around\n",
|
|
|
1d442b |
+ __func__);
|
|
|
1d442b |
+ continue;
|
|
|
1d442b |
+ }
|
|
|
1d442b |
+ fuse_log(FUSE_LOG_ERR, "fv_queue_thread ppoll: %m\n");
|
|
|
1d442b |
+ break;
|
|
|
1d442b |
+ }
|
|
|
1d442b |
+ assert(poll_res == 1);
|
|
|
1d442b |
+ if (pf[0].revents & (POLLERR | POLLHUP | POLLNVAL)) {
|
|
|
1d442b |
+ fuse_log(FUSE_LOG_ERR, "%s: Unexpected poll revents %x Queue %d\n",
|
|
|
1d442b |
+ __func__, pf[0].revents, qi->qidx);
|
|
|
1d442b |
+ break;
|
|
|
1d442b |
+ }
|
|
|
1d442b |
+ assert(pf[0].revents & POLLIN);
|
|
|
1d442b |
+ fuse_log(FUSE_LOG_DEBUG, "%s: Got queue event on Queue %d\n", __func__,
|
|
|
1d442b |
+ qi->qidx);
|
|
|
1d442b |
+
|
|
|
1d442b |
+ eventfd_t evalue;
|
|
|
1d442b |
+ if (eventfd_read(qi->kick_fd, &evalue)) {
|
|
|
1d442b |
+ fuse_log(FUSE_LOG_ERR, "Eventfd_read for queue: %m\n");
|
|
|
1d442b |
+ break;
|
|
|
1d442b |
+ }
|
|
|
1d442b |
+ if (qi->virtio_dev->se->debug) {
|
|
|
1d442b |
+ fprintf(stderr, "%s: Queue %d gave evalue: %zx\n", __func__,
|
|
|
1d442b |
+ qi->qidx, (size_t)evalue);
|
|
|
1d442b |
+ }
|
|
|
1d442b |
}
|
|
|
1d442b |
|
|
|
1d442b |
return NULL;
|