linux-kernel - [PATCH 2/6] fs/namespace.c: shift put_mountpoint() to callers of unhash

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Date:   Sat,  6 Jul 2019 01:22:32 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-fsdevel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] fs/namespace.c: shift put_mountpoint() to callers of unhash_mnt()

From: Al Viro <viro@...iv.linux.org.uk>

make unhash_mnt() return the mountpoint to be dropped, let callers
deal with it.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namespace.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 746e3fd1f430..b7059a4f07e3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -795,15 +795,17 @@ static void __touch_mnt_namespace(struct mnt_namespace *ns)
 /*
  * vfsmount lock must be held for write
  */
-static void unhash_mnt(struct mount *mnt)
+static struct mountpoint *unhash_mnt(struct mount *mnt)
 {
+	struct mountpoint *mp;
 	mnt->mnt_parent = mnt;
 	mnt->mnt_mountpoint = mnt->mnt.mnt_root;
 	list_del_init(&mnt->mnt_child);
 	hlist_del_init_rcu(&mnt->mnt_hash);
 	hlist_del_init(&mnt->mnt_mp_list);
-	put_mountpoint(mnt->mnt_mp);
+	mp = mnt->mnt_mp;
 	mnt->mnt_mp = NULL;
+	return mp;
 }
 
 /*
@@ -813,7 +815,7 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
 {
 	old_path->dentry = mnt->mnt_mountpoint;
 	old_path->mnt = &mnt->mnt_parent->mnt;
-	unhash_mnt(mnt);
+	put_mountpoint(unhash_mnt(mnt));
 }
 
 /*
@@ -823,7 +825,7 @@ static void umount_mnt(struct mount *mnt)
 {
 	/* old mountpoint will be dropped when we can do that */
 	mnt->mnt_ex_mountpoint = mnt->mnt_mountpoint;
-	unhash_mnt(mnt);
+	put_mountpoint(unhash_mnt(mnt));
 }
 
 /*
-- 
2.11.0