[PATCH 2/2] fs: export mnt_{get,put}_write_access() to modules

From: Amir Goldstein <amir73il@gmail.com>
To: Christian Brauner <brauner@kernel.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>, Jan Kara <jack@suse.cz>,
	Christoph Hellwig <hch@lst.de>, Al Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org
Subject: [PATCH 2/2] fs: export mnt_{get,put}_write_access() to modules
Date: Fri,  8 Sep 2023 16:29:00 +0300	[thread overview]
Message-ID: <20230908132900.2983519-3-amir73il@gmail.com> (raw)
In-Reply-To: <20230908132900.2983519-1-amir73il@gmail.com>

Overlayfs is going to use those to get write access on the upper mount
during entire copy up without taking freeze protection on upper sb for
the entire copy up.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/namespace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index 3fe7c0484e6a..9e0ea73f2ff9 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -386,6 +386,7 @@ int mnt_get_write_access(struct vfsmount *m)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(mnt_get_write_access);
 
 /**
  * mnt_want_write - get write access to a mount
@@ -466,6 +467,7 @@ void mnt_put_write_access(struct vfsmount *mnt)
 	mnt_dec_writers(real_mount(mnt));
 	preempt_enable();
 }
+EXPORT_SYMBOL_GPL(mnt_put_write_access);
 
 /**
  * mnt_drop_write - give up write access to a mount
-- 
2.34.1

