devfs - Change setattr code to use vop_helper fns

* Change the devfs vop_setattr to use the vop_helper functions for chown
  and chmod.

* This gets rid of the previous roll-your-own solution and fixes several
  edge cases.

* It also fixes a warning thrown by xterm when closing it.

Reported-by: luxh

diff --git a/sys/vfs/devfs/devfs_vnops.c b/sys/vfs/devfs/devfs_vnops.c
index 013e06f..5feb01b 100644 (file)
--- a/sys/vfs/devfs/devfs_vnops.c
+++ b/sys/vfs/devfs/devfs_vnops.c
@@ -606,6 +606,9 @@ devfs_vop_setattr(struct vop_setattr_args *ap)
 {
        struct devfs_node *node = DEVFS_NODE(ap->a_vp);
        struct vattr *vap;
+       uid_t cur_uid;
+       gid_t cur_gid;
+       mode_t cur_mode;
        int error = 0;
 
        if (!devfs_node_is_accessible(node))
@@ -616,33 +619,29 @@ devfs_vop_setattr(struct vop_setattr_args *ap)
 
        vap = ap->a_vap;
 
-       if (vap->va_uid != (uid_t)VNOVAL) {
-               if ((ap->a_cred->cr_uid != node->uid) &&
-                   (!groupmember(node->gid, ap->a_cred))) {
-                       error = priv_check(curthread, PRIV_VFS_CHOWN);
-                       if (error)
-                               goto out;
-               }
-               node->uid = vap->va_uid;
-       }
+       if ((vap->va_uid != (uid_t)VNOVAL) || (vap->va_gid != (gid_t)VNOVAL)) {
+               cur_uid = node->uid;
+               cur_gid = node->gid;
+               cur_mode = node->mode;
+               error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
+                   ap->a_cred, &cur_uid, &cur_gid, &cur_mode);
+               if (error)
+                       goto out;
 
-       if (vap->va_gid != (uid_t)VNOVAL) {
-               if ((ap->a_cred->cr_uid != node->uid) &&
-                   (!groupmember(node->gid, ap->a_cred))) {
-                       error = priv_check(curthread, PRIV_VFS_CHOWN);
-                       if (error)
-                               goto out;
+               if (node->uid != cur_uid || node->gid != cur_gid) {
+                       node->uid = cur_uid;
+                       node->gid = cur_gid;
+                       node->mode = cur_mode;
                }
-               node->gid = vap->va_gid;
        }
 
        if (vap->va_mode != (mode_t)VNOVAL) {
-               if (ap->a_cred->cr_uid != node->uid) {
-                       error = priv_check(curthread, PRIV_VFS_ADMIN);
-                       if (error)
-                               goto out;
+               cur_mode = node->mode;
+               error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
+                   node->uid, node->gid, &cur_mode);
+               if (error == 0 && node->mode != cur_mode) {
+                       node->mode = cur_mode;
                }
-               node->mode = vap->va_mode;
        }
 
 out: