Re: ubc_uiomove returns EINVAL

[manu%netbsd.org@localhost (Emmanuel Dreyfus)]

Chuck Silvers <chuq%chuq.com@localhost> wrote:

> the caller of uvm_fault() will arrange for kcopy(), copyin(), etc, to return
> the error returned from uvm_fault(), which is probably coming from
> VOP_GETPAGES() of the vnode you're trying to access with ubc_uiomove().

That's it. In my case, it comes from here in genfs_getpages(), because I read
beyond EOF without PGO_PASTEOF:

        if (origoffset + (ap->a_centeridx << PAGE_SHIFT) >= memeof) {
                if ((flags & PGO_LOCKED) == 0) {
                        mutex_exit(uobj->vmobjlock);
                } 
                UVMHIST_LOG(ubchist, "off 0x%x count %d goes past EOF 0x%x",
                    origoffset, *ap->a_count, memeof,0);
                error = EINVAL; 
                goto out_err;
        }

Indeed I expectec ubc_uiomove to prepare a zero-filled area when requested
offsets beyond EOF. But I see no way to have PGO_PASTEOF set from
ubc_uiomove().

-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu%netbsd.org@localhost