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virtiofsd: add --rlimit-nofile=NUM option

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Make it possible to specify the RLIMIT_NOFILE on the command-line.
Users running multiple virtiofsd processes should allocate a certain
number to each process so that the system-wide limit can never be
exhausted.

When this option is set to 0 the rlimit is left at its current value.
This is useful when a management tool wants to configure the rlimit
itself.

The default behavior remains unchanged: try to set the limit to
1,000,000 file descriptors if the current rlimit is lower.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20200501140644.220940-2-stefanha@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-05-01 15:06:43 +01:00 • committed by Dr. David Alan Gilbert
parent 1c47613588
commit 6dbb716877
3 changed files with 32 additions and 14 deletions
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22
tools/virtiofsd/passthrough_ll.c
View file

@ -2707,24 +2707,18 @@ static void setup_sandbox(struct lo_data *lo, struct fuse_session *se,
setup_seccomp(enable_syslog);
}
/* Raise the maximum number of open file descriptors */
static void setup_nofile_rlimit(void)
/* Set the maximum number of open file descriptors */
static void setup_nofile_rlimit(unsigned long rlimit_nofile)
{
const rlim_t max_fds = 1000000;
struct rlimit rlim;
struct rlimit rlim = {
.rlim_cur = rlimit_nofile,
.rlim_max = rlimit_nofile,
};
if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
fuse_log(FUSE_LOG_ERR, "getrlimit(RLIMIT_NOFILE): %m\n");
exit(1);
}
if (rlim.rlim_cur >= max_fds) {
if (rlimit_nofile == 0) {
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) {
@ -2977,7 +2971,7 @@ int main(int argc, char *argv[])
fuse_daemonize(opts.foreground);
setup_nofile_rlimit();
setup_nofile_rlimit(opts.rlimit_nofile);
/* Must be before sandbox since it wants /proc */
setup_capng();