linux-kernel - [PATCH v2 03/16] fs/overlayfs: Introduce ovl_override_creds

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Message-ID: <20240822012523.141846-4-vinicius.gomes@intel.com>
Date: Wed, 21 Aug 2024 18:25:10 -0700
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: brauner@...nel.org,
	amir73il@...il.com,
	hu1.chen@...el.com
Cc: miklos@...redi.hu,
	malini.bhandaru@...el.com,
	tim.c.chen@...el.com,
	mikko.ylinen@...el.com,
	lizhen.you@...el.com,
	linux-unionfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: [PATCH v2 03/16] fs/overlayfs: Introduce ovl_override_creds_light()

Will be used when there are guarantees that the credentials usage
count is not modified in the critical section.

This is a temporary helper, that will be removed when all users are
converted to use the credentials GUARD() helpers.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
 fs/overlayfs/overlayfs.h | 1 +
 fs/overlayfs/util.c      | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 0bfe35da4b7b..557d8c4e3a01 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -429,6 +429,7 @@ int ovl_want_write(struct dentry *dentry);
 void ovl_drop_write(struct dentry *dentry);
 struct dentry *ovl_workdir(struct dentry *dentry);
 const struct cred *ovl_override_creds(struct super_block *sb);
+const struct cred *ovl_override_creds_light(struct super_block *sb);
 
 static inline const struct cred *ovl_creds(struct super_block *sb)
 {
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index edc9216f6e27..3525ede21600 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -68,6 +68,13 @@ const struct cred *ovl_override_creds(struct super_block *sb)
 	return override_creds(ofs->creator_cred);
 }
 
+const struct cred *ovl_override_creds_light(struct super_block *sb)
+{
+	struct ovl_fs *ofs = OVL_FS(sb);
+
+	return override_creds_light(ofs->creator_cred);
+}
+
 /*
  * Check if underlying fs supports file handles and try to determine encoding
  * type, in order to deduce maximum inode number used by fs.
-- 
2.46.0