[Devel] [PATCH hci-8.1 v2 3/4] ovl: Keep creator VE in overlayfs superblock

[Vladimir Riabchun]

Overlayfs superblock stores creator creds in it, but these creds
should go together with the VE they were taken from.

Store the VE in the superblock. We can't use mount->owner_ve,
because several mounts can reference one superblock.

https://virtuozzo.atlassian.net/browse/VSTOR-142405

Signed-off-by: Vladimir Riabchun <vladimir.riabchun at virtuozzo.com>
---
 fs/overlayfs/ovl_entry.h | 1 +
 fs/overlayfs/params.c    | 3 +++
 fs/overlayfs/super.c     | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index ab78001635e7..a6ad8b8de48c 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -77,6 +77,7 @@ struct ovl_fs {
 	struct ovl_config config;
 	/* creds of process who forced instantiation of super block */
 	const struct cred *creator_cred;
+	struct ve_struct *creator_ve;
 	bool tmpfile;
 	bool noxattr;
 	bool nofh;
diff --git a/fs/overlayfs/params.c b/fs/overlayfs/params.c
index 32c58fcfe52f..c047f1265b8e 100644
--- a/fs/overlayfs/params.c
+++ b/fs/overlayfs/params.c
@@ -8,6 +8,7 @@
 #include <linux/posix_acl_xattr.h>
 #include <linux/seq_file.h>
 #include <linux/xattr.h>
+#include <linux/ve.h>
 #include "overlayfs.h"
 #include "params.h"
 
@@ -761,6 +762,8 @@ void ovl_free_fs(struct ovl_fs *ofs)
 	kfree(ofs->config.workdir);
 	if (ofs->creator_cred)
 		put_cred(ofs->creator_cred);
+	if (ofs->creator_ve)
+		put_ve(ofs->creator_ve);
 	kfree(ofs);
 }
 
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index fb47711c8fb9..8ab39a35a873 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -18,6 +18,7 @@
 #include <linux/file.h>
 #include <linux/fs_context.h>
 #include <linux/fs_parser.h>
+#include <linux/ve.h>
 #include "overlayfs.h"
 #include "params.h"
 
@@ -1328,6 +1329,8 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
 
 	sb->s_d_op = &ovl_dentry_operations;
 
+	ofs->creator_ve = get_ve(get_exec_env());
+
 	err = -ENOMEM;
 	ofs->creator_cred = cred = prepare_creds();
 	if (!cred)

-- 
2.52.0