qemu-kvm/SOURCES/kvm-virtiofsd-set-maximum-RLIMIT_NOFILE-limit.patch

94 lines
2.8 KiB
Diff

From 4cc435b3a8a9a419cc85ee883d5184f810f91e52 Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Mon, 27 Jan 2020 19:01:34 +0100
Subject: [PATCH 063/116] virtiofsd: set maximum RLIMIT_NOFILE limit
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20200127190227.40942-60-dgilbert@redhat.com>
Patchwork-id: 93516
O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 059/112] virtiofsd: set maximum RLIMIT_NOFILE limit
Bugzilla: 1694164
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
From: Stefan Hajnoczi <stefanha@redhat.com>
virtiofsd can exceed the default open file descriptor limit easily on
most systems. Take advantage of the fact that it runs as root to raise
the limit.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit 01a6dc95ec7f71eeff9963fe3cb03d85225fba3e)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
tools/virtiofsd/passthrough_ll.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index d53cb1e..c281d81 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -53,6 +53,7 @@
#include <sys/file.h>
#include <sys/mount.h>
#include <sys/prctl.h>
+#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
@@ -2268,6 +2269,35 @@ static void setup_sandbox(struct lo_data *lo, struct fuse_session *se)
setup_seccomp();
}
+/* Raise the maximum number of open file descriptors */
+static void setup_nofile_rlimit(void)
+{
+ const rlim_t max_fds = 1000000;
+ struct rlimit rlim;
+
+ if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
+ fuse_log(FUSE_LOG_ERR, "getrlimit(RLIMIT_NOFILE): %m\n");
+ exit(1);
+ }
+
+ if (rlim.rlim_cur >= max_fds) {
+ return; /* nothing to do */
+ }
+
+ rlim.rlim_cur = max_fds;
+ rlim.rlim_max = max_fds;
+
+ if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
+ /* Ignore SELinux denials */
+ if (errno == EPERM) {
+ return;
+ }
+
+ fuse_log(FUSE_LOG_ERR, "setrlimit(RLIMIT_NOFILE): %m\n");
+ exit(1);
+ }
+}
+
int main(int argc, char *argv[])
{
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
@@ -2389,6 +2419,8 @@ int main(int argc, char *argv[])
fuse_daemonize(opts.foreground);
+ setup_nofile_rlimit();
+
/* Must be before sandbox since it wants /proc */
setup_capng();
--
1.8.3.1