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authorEric W. Biederman <ebiederm@xmission.com>2015-01-15 22:58:33 -0600
committerEric W. Biederman <ebiederm@xmission.com>2015-04-09 11:39:54 -0500
commit6a46c5735c29175da55b2fa9d53775182422cdd7 (patch)
tree1f98d10a0d3485f49bd59cc78ce0aee74de577c7 /fs/namespace.c
parent7bdb11de8ee4f4ae195e2fa19efd304e0b36c63b (diff)
downloadlwn-6a46c5735c29175da55b2fa9d53775182422cdd7.tar.gz
lwn-6a46c5735c29175da55b2fa9d53775182422cdd7.zip
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" <ebiederm@xmission.com>
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c14
1 files 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
@@ -822,6 +822,16 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
/*
* 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
+ */
void mnt_set_mountpoint(struct mount *mnt,
struct mountpoint *mp,
struct mount *child_mnt)
@@ -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);
}