From: Ben Gras <ben@minix3.org>
Date: Fri, 11 Jun 2010 11:41:56 +0000 (+0000)
Subject: vfs: don't use a mountpoint if it's in use for anything else.
X-Git-Tag: v3.1.8~453
X-Git-Url: http://zhaoyanbai.com/repos/rndc.html?a=commitdiff_plain;h=19b790eb53a81c853bc7dccf05e49b0bb3b37633;p=minix.git

vfs: don't use a mountpoint if it's in use for anything else.

(this avoids data structure confusion if a mountpoint is reused as
a mountpoint until that's properly fixed.)
---

diff --git a/servers/vfs/mount.c b/servers/vfs/mount.c
index 7da620c7a..9cddb884e 100644
--- a/servers/vfs/mount.c
+++ b/servers/vfs/mount.c
@@ -253,6 +253,12 @@ PRIVATE int mount_fs(endpoint_t fs_e)
   	/* Get vnode of mountpoint */
 	if ((vp = eat_path(PATH_NOFLAGS)) == NULL) return(err_code);
 
+	       if (vp->v_ref_count != 1) {
+	               put_vnode(vp);
+	               return(EBUSY);
+	       }
+
+
 	/* Tell FS on which vnode it is mounted (glue into mount tree) */
 	if ((r = req_mountpoint(vp->v_fs_e, vp->v_inode_nr)) != OK) {
 		put_vnode(vp);