[Devel] [PATCH RHEL8 COMMIT] ve/fs/autofs: Allow autofs to be used inside a container

[Konstantin Khorenko]

The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.17
------>
commit 8427a6d9a58be615656f6de08bba56dccad12ae0
Author: Stanislav Kinsburskiy <skinsbursky at virtuozzo.com>
Date:   Tue Apr 20 14:52:41 2021 +0300

    ve/fs/autofs: Allow autofs to be used inside a container
    
    It turned out that autofs is used at least for NFS/CIFS and binfmt_misc.
    
    Let's use new FS_VE_MOUNT flag to only allow autofs mounts in
    conainer-init userns, which would mimic mainstream host behaviour.
    
    https://jira.sw.ru/browse/PSBM-26968
    https://jira.sw.ru/browse/PSBM-86138
    https://jira.sw.ru/browse/PSBM-128649
    
    Rebase from VZ7, with use of FS_VE_MOUNT and with comment cleanup:
    vz7 commits:
    83c27c7bffcc1 ("ve/fs/autofs: mark autofs as virtualized")
    0045b317c97b ("ve/fs/autofs: allow to mount autofs inside non-root userns")
    
    Fixes: 7ddb6e8dd9f6 ("fs: Mask appropriate filesystems FS_VIRTUALIZED")
    
    Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
 fs/autofs/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/autofs/init.c b/fs/autofs/init.c
index 99bb56d42907..e502b0c0d215 100644
--- a/fs/autofs/init.c
+++ b/fs/autofs/init.c
@@ -21,7 +21,7 @@ struct file_system_type autofs_fs_type = {
 	.name		= "autofs",
 	.mount		= autofs_mount,
 	.kill_sb	= autofs_kill_sb,
-	.fs_flags	= FS_VIRTUALIZED,
+	.fs_flags	= FS_VIRTUALIZED | FS_VE_MOUNT,
 };
 MODULE_ALIAS_FS("autofs");
 MODULE_ALIAS("autofs");