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 ownership of the given vnode. At least one of uid or gid must
* be different than VNOVAL. If one is set to that value, the attribute
* is unchanged.
* 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_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred)
{
mode_t cur_mode;
uid_t cur_uid;
gid_t cur_gid;
struct tmpfs_node *node;
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_uid = node->tn_uid;
cur_gid = node->tn_gid;
cur_mode = node->tn_mode;
error = vop_helper_chown(vp, uid, gid, cred,
&cur_uid, &cur_gid, &cur_mode);
if (error == 0) {
TMPFS_NODE_LOCK(node);
if (cur_uid != node->tn_uid ||
cur_gid != node->tn_gid ||
cur_mode != node->tn_mode) {
node->tn_uid = cur_uid;
node->tn_gid = cur_gid;
node->tn_mode = cur_mode;
node->tn_status |= TMPFS_NODE_CHANGED;
}
TMPFS_NODE_UNLOCK(node);
}
return error;
}
