static int
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))
return ENOENT;
node_sync_dev_get(node);
lockmgr(&devfs_lock, LK_EXCLUSIVE);
vap = ap->a_vap;
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 (node->uid != cur_uid || node->gid != cur_gid) {
node->uid = cur_uid;
node->gid = cur_gid;
node->mode = cur_mode;
}
}
if (vap->va_mode != (mode_t)VNOVAL) {
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;
}
}
out:
node_sync_dev_set(node);
nanotime(&node->ctime);
lockmgr(&devfs_lock, LK_RELEASE);
return error;
}
/*
* Change access mode on the given vnode.
* Caller should execute tmpfs_update on vp after a successful execution.
* The vnode must be locked on entry and remain locked on exit.
*/
int
tmpfs_chmod(struct vnode *vp, mode_t vamode, struct ucred *cred)
{
struct tmpfs_node *node;
mode_t cur_mode;
int error;
KKASSERT(vn_islocked(vp));
node = VP_TO_TMPFS_NODE(vp);
/* Disallow this operation if the file system is mounted read-only. */
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
/* Immutable or append-only files cannot be modified, either. */
if (node->tn_flags & (IMMUTABLE | APPEND))
return EPERM;
cur_mode = node->tn_mode;
error = vop_helper_chmod(vp, vamode, cred, node->tn_uid, node->tn_gid,
&cur_mode);
if (error == 0 &&
(node->tn_mode & ALLPERMS) != (cur_mode & ALLPERMS)) {
TMPFS_NODE_LOCK(node);
node->tn_mode &= ~ALLPERMS;
node->tn_mode |= cur_mode & ALLPERMS;
node->tn_status |= TMPFS_NODE_CHANGED;
TMPFS_NODE_UNLOCK(node);
}
KKASSERT(vn_islocked(vp));
return 0;
}
