From 6a46c5735c29175da55b2fa9d53775182422cdd7 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 15 Jan 2015 22:58:33 -0600 Subject: [PATCH] mnt: Factor umount_mnt from umount_tree For future use factor out a function umount_mnt from umount_tree. This function unhashes a mount and remembers where the mount was mounted so that eventually when the code makes it to a sleeping context the mountpoint can be dput. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" --- fs/namespace.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index e669a3bf86e7..010d5bebcb7e 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -819,6 +819,16 @@ static void detach_mnt(struct mount *mnt, struct path *old_path) unhash_mnt(mnt); } +/* + * vfsmount lock must be held for write + */ +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); +} + /* * vfsmount lock must be held for write */ @@ -1371,9 +1381,7 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how) pin_insert_group(&p->mnt_umount, &p->mnt_parent->mnt, &unmounted); if (mnt_has_parent(p)) { mnt_add_count(p->mnt_parent, -1); - /* old mountpoint will be dropped when we can do that */ - p->mnt_ex_mountpoint = p->mnt_mountpoint; - unhash_mnt(p); + umount_mnt(p); } change_mnt_propagation(p, MS_PRIVATE); } -- 2.39.2