[Devel] [PATCH VZ10 1/1] fs: namespace: allow mounting blockdevices without extra options

[Vasileios Almpanis]

ve_devmnt_process will iterate over all device-mounts of the current
ve namespace and will bounce the mount in case opts is a non NULL
pointer. Change the behavior to allow it.

Our goal is:
- device cgroup ebpf filters will filter which devices are allowed to be
  mounted, and which not.
- ve.mount_opts will be used as a filter of which mount options are
  allowed. It shouldn't deny mounting when no options are passed but it
  should deny in case some option is passed that is not explicitly
  allowed.

https://virtuozzo.atlassian.net/browse/VSTOR-132330
Signed-off-by: Vasileios Almpanis <vasileios.almpanis at virtuozzo.com>

Feature: ve: ve generic structures
---
 fs/namespace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index acd4507e1247..1b5460445616 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3196,6 +3196,8 @@ int ve_devmnt_process(struct ve_struct *ve, dev_t dev, void **data_pp, int remou
 			 */
 			if (ve->is_pseudosuper) {
 				err = 0;
+			} else if (((char *)*data_pp)[0] == '\0') {
+				err = 0;
 			} else {
 				ve_pr_warn_ratelimited(VE_LOG_BOTH, "VE%s: no allowed "
 					  "mount options found for device %u:%u\n",
-- 
2.43.0