[PATCH] count ghost references to vfsmounts
make propagate_mount_busy() exclude references from the vfsmounts
that had been isolated by umount_tree() and are just waiting for
release_mounts() to dispose of their ->mnt_parent/->mnt_mountpoint.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namespace.c b/fs/namespace.c
index 6324dfc..c175218 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -548,6 +548,7 @@
m = mnt->mnt_parent;
mnt->mnt_mountpoint = mnt->mnt_root;
mnt->mnt_parent = mnt;
+ m->mnt_ghosts--;
spin_unlock(&vfsmount_lock);
dput(dentry);
mntput(m);
@@ -572,8 +573,10 @@
__touch_mnt_namespace(p->mnt_ns);
p->mnt_ns = NULL;
list_del_init(&p->mnt_child);
- if (p->mnt_parent != p)
+ if (p->mnt_parent != p) {
+ p->mnt_parent->mnt_ghosts++;
p->mnt_mountpoint->d_mounted--;
+ }
change_mnt_propagation(p, MS_PRIVATE);
}
}