PSEUDOCODE
int
vop_getattr(struct vnode *vp, struct vattr *vap,
struct ucred *cred, struct thread *td)
{
/*
* Fill in the contents of *vap with information from
* the file system.
*/
...;
return 0;
}
int
vop_setattr(struct vnode *vp, struct vattr *vap,
struct ucred *cred, struct thread *td)
{
/*
* Check for unsettable attributes.
*/
if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
return (EINVAL);
}
if (vap->va_flags != VNOVAL) {
/*
* Set the immutable and append flags of the file.
*/
}
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
/*
* Change owner and/or group of the file.
*/
}
if (vap->va_size != VNOVAL) {
/*
* Truncate the file to the specified size.
*/
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
/*
* Change access and/or modification time of file.
*/
}
if (vap->va_mode != (mode_t)VNOVAL) {
/*
* Change permissions of file.
*/
}
return 0;
}
ERRORS
