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virtiofsd: set maximum RLIMIT_NOFILE limit 

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>
This commit is contained in:
Stefan Hajnoczi 2019-03-22 15:54:13 +00:00 committed by Dr. David Alan Gilbert
parent ee88465224
commit 01a6dc95ec
1 changed files with 32 additions and 0 deletions
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32
tools/virtiofsd/passthrough_ll.c
View File

@ -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();