The commit is pushed to "branch-rh9-5.14.vz9.1.x-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after ark-5.14
------>
commit 232988baf46cc533e5f8c75f7ac7578fe99e5009
Author: Valeriy.Vdovin <valeriy.vdo...@virtuozzo.com>
Date: Mon Oct 4 20:39:03 2021 +0300
kernfs/ve: ignore kernfs 've_perms_map' in cgroups.
Kernfs implements file permissions logic, that relies on
(struct kernfs_node).ve_perms_map. In VZ8 cgroups have been modified
to use kernfs, but cgroups do not benefit from using ve_perms_map in
any way so it's left uninitialized in cgroup code. There is no clear
way of implementing any kind of stub ve_perms_map for cgroups, so it
seems the best logic is to allow the field exist as NULL for those
who uses kernfs but don't wish to use ve_perms_map.
https://jira.sw.ru/browse/PSBM-104455
Signed-off-by: Valeriy.Vdovin <valeriy.vdo...@virtuozzo.com>
Reviewed-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
(cherry picked from vz8 commit 81cf32167e09ac0c0240991070e069f91c0eda6d)
Signed-off-by: Andrey Zhadchenko <andrey.zhadche...@virtuozzo.com>
---
fs/kernfs/ve.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/kernfs/ve.c b/fs/kernfs/ve.c
index 8abb020de40f..ea8b583c8d8f 100644
--- a/fs/kernfs/ve.c
+++ b/fs/kernfs/ve.c
@@ -123,6 +123,15 @@ bool kernfs_d_visible(struct kernfs_node *kn, struct
kernfs_super_info *info)
if (kernfs_type(kn) == KERNFS_LINK)
kn = kn->symlink.target_kn;
+ /*
+ * Some systems that are built on top of kernfs might
+ * not want to use ve_perms_map (cgroup is an example)
+ * so they leave ve_perms_map uninitialized.
+ * For them we just true.
+ */
+ if (!kn->ve_perms_map)
+ return true;
+
return !!kmapset_get_value(kn->ve_perms_map,
kernfs_info_perms_key(info));
}
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