/*
* EOPNOTSUPP is no longer legal. For local media VFS's that do not
* implement their own VOP_PUTPAGES, their VOP_PUTPAGES should call to
* vnode_pager_generic_putpages() to implement the previous behaviour.
*
* Caller has already cleared the pmap modified bits, if any.
*
* All other FS's should use the bypass to get to the local media
* backing vp's VOP_PUTPAGES.
*/
static void
vnode_pager_putpages(vm_object_t object, vm_page_t *m, int count,
int sync, int *rtvals)
{
int rtval;
struct vnode *vp;
int bytes = count * PAGE_SIZE;
/*
* Force synchronous operation if we are extremely low on memory
* to prevent a low-memory deadlock. VOP operations often need to
* allocate more memory to initiate the I/O ( i.e. do a BMAP
* operation ). The swapper handles the case by limiting the amount
* of asynchronous I/O, but that sort of solution doesn't scale well
* for the vnode pager without a lot of work.
*
* Also, the backing vnode's iodone routine may not wake the pageout
* daemon up. This should be probably be addressed XXX.
*/
if ((vmstats.v_free_count + vmstats.v_cache_count) <
vmstats.v_pageout_free_min) {
sync |= OBJPC_SYNC;
}
/*
* Call device-specific putpages function
*/
vp = object->handle;
rtval = VOP_PUTPAGES(vp, m, bytes, sync, rtvals, 0);
if (rtval == EOPNOTSUPP) {
kprintf("vnode_pager: *** WARNING *** stale FS putpages\n");
rtval = vnode_pager_generic_putpages( vp, m, bytes, sync, rtvals);
}
}
static int
union_putpages(struct vop_putpages_args *ap)
{
int r;
r = vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
ap->a_sync, ap->a_rtvals);
return(r);
}
int
vop_stdputpages(struct vop_putpages_args *ap)
{
struct mount *mp;
int error;
if ((mp = ap->a_vp->v_mount) != NULL) {
error = vnode_pager_generic_putpages(
ap->a_vp, ap->a_m, ap->a_count,
ap->a_sync, ap->a_rtvals);
} else {
error = VM_PAGER_BAD;
}
return (error);
}
/*
* Vnode op for VM putpages.
* possible bug: all IO done in sync mode
* Note that vop_close always invalidate pages before close, so it's
* not necessary to open vnode.
*
* nwfs_putpages(struct vnode *a_vp, vm_page_t *a_m, int a_count,
* int a_sync, int *a_rtvals, vm_ooffset_t a_offset)
*/
int
nwfs_putpages(struct vop_putpages_args *ap)
{
int error;
struct thread *td = curthread; /* XXX */
struct vnode *vp = ap->a_vp;
struct ucred *cred;
#ifndef NWFS_RWCACHE
KKASSERT(td->td_proc);
cred = td->td_proc->p_ucred; /* XXX */
VOP_OPEN(vp, FWRITE, cred, NULL);
error = vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
ap->a_sync, ap->a_rtvals);
VOP_CLOSE(vp, FWRITE, cred);
return error;
#else
struct uio uio;
struct iovec iov;
vm_offset_t kva;
struct buf *bp;
int i, npages, count;
int *rtvals;
struct nwmount *nmp;
struct nwnode *np;
vm_page_t *pages;
KKASSERT(td->td_proc);
cred = td->td_proc->p_ucred; /* XXX */
/* VOP_OPEN(vp, FWRITE, cred, NULL);*/
np = VTONW(vp);
nmp = VFSTONWFS(vp->v_mount);
pages = ap->a_m;
count = ap->a_count;
rtvals = ap->a_rtvals;
npages = btoc(count);
for (i = 0; i < npages; i++) {
rtvals[i] = VM_PAGER_AGAIN;
}
bp = getpbuf_kva(&nwfs_pbuf_freecnt);
kva = (vm_offset_t) bp->b_data;
pmap_qenter(kva, pages, npages);
iov.iov_base = (caddr_t) kva;
iov.iov_len = count;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
uio.uio_resid = count;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_WRITE;
uio.uio_td = td;
NCPVNDEBUG("ofs=%d,resid=%d\n",(int)uio.uio_offset, uio.uio_resid);
error = ncp_write(NWFSTOCONN(nmp), &np->n_fh, &uio, cred);
/* VOP_CLOSE(vp, FWRITE, cred);*/
NCPVNDEBUG("paged write done: %d\n", error);
pmap_qremove(kva, npages);
relpbuf(bp, &nwfs_pbuf_freecnt);
if (!error) {
int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
for (i = 0; i < nwritten; i++) {
rtvals[i] = VM_PAGER_OK;
vm_page_undirty(pages[i]);
}
}
return rtvals[0];
#endif /* NWFS_RWCACHE */
}