@@ -762,7 +762,12 @@ int main(int argc, char **argv)
#endif
#ifdef URING
have_io_uring = true;
- /* If ENOSYS, just ignore uring, other errors are fatal. */
+ /*
+ * If ENOSYS, just ignore uring, due to kernel doesn't support it.
+ * If EPERM, maybe due to sysctl kernel.io_uring_disabled isn't 0,
+ * or some selinux policies, etc.
+ * Other errors are fatal.
+ */
c = io_uring_queue_init(URING_ENTRIES, &ring, 0);
switch(c){
case 0:
@@ -770,9 +775,16 @@ int main(int argc, char **argv)
break;
case -ENOSYS:
have_io_uring = false;
+ if (verbose)
+ printf("io_uring isn't supported by kernel\n");
+ break;
+ case -EPERM:
+ have_io_uring = false;
+ if (verbose)
+ printf("io_uring isn't allowed, check io_uring_disabled sysctl or selinux policy\n");
break;
default:
- fprintf(stderr, "io_uring_queue_init failed\n");
+ fprintf(stderr, "io_uring_queue_init failed, errno=%d\n", -c);
exit(1);
}
#endif
I found the io_uring testing still fails as: io_uring_queue_init failed even if kernel supports io_uring feature. That because of the /proc/sys/kernel/io_uring_disabled isn't 0. Different value means: 0 All processes can create io_uring instances as normal. 1 io_uring creation is disabled (io_uring_setup() will fail with -EPERM) for unprivileged processes not in the io_uring_group group. Existing io_uring instances can still be used. See the documentation for io_uring_group for more information. 2 io_uring creation is disabled for all processes. io_uring_setup() always fails with -EPERM. Existing io_uring instances can still be used. So besides the CONFIG_IO_URING kernel config, there's another switch can on or off the io_uring supporting. And the "2" or "1" might be the default on some systems. On this situation the io_uring_queue_init returns -EPERM, so I change the fsstress to ignore io_uring testing if io_uring_queue_init returns -ENOSYS or -EPERM. And print different verbose message for debug. Signed-off-by: Zorro Lang <zlang@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> --- ltp/fsstress.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)