[Devel] [PATCH RHEL10 COMMIT] fs: namespace: allow mounting blockdevices without extra options

[Konstantin Khorenko]

The commit is pushed to "branch-rh10-6.12.0-211.16.1.12.x.vz10-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git
after rh10-6.12.0-211.16.1.12.4.vz10
------>
commit 213ef7672ba4c0964be625897d0b219ef044ddf7
Author: Vasileios Almpanis <vasileios.almpanis at virtuozzo.com>
Date:   Thu May 28 14:27:38 2026 +0000

    fs: namespace: allow mounting blockdevices without extra options
    
    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.
    
    Feature: ve: ve generic structures
    https://virtuozzo.atlassian.net/browse/VSTOR-132330
    Signed-off-by: Vasileios Almpanis <vasileios.almpanis at virtuozzo.com>
    Reviewed-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
 fs/namespace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index 4639be66ad98c..566f11a222fcf 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3236,6 +3236,8 @@ 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",