/*
* The strategy function is typically only called when memory pressure
* forces the system to attempt to pageout pages. It can also be called
* by [n]vtruncbuf() when a truncation cuts a page in half. Normal write
* operations
*/
static int
tmpfs_strategy(struct vop_strategy_args *ap)
{
struct bio *bio = ap->a_bio;
struct bio *nbio;
struct buf *bp = bio->bio_buf;
struct vnode *vp = ap->a_vp;
struct tmpfs_node *node;
vm_object_t uobj;
vm_page_t m;
int i;
if (vp->v_type != VREG) {
bp->b_resid = bp->b_bcount;
bp->b_flags |= B_ERROR | B_INVAL;
bp->b_error = EINVAL;
biodone(bio);
return(0);
}
lwkt_gettoken(&vp->v_mount->mnt_token);
node = VP_TO_TMPFS_NODE(vp);
uobj = node->tn_reg.tn_aobj;
/*
* Don't bother flushing to swap if there is no swap, just
* ensure that the pages are marked as needing a commit (still).
*/
if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) {
for (i = 0; i < bp->b_xio.xio_npages; ++i) {
m = bp->b_xio.xio_pages[i];
vm_page_need_commit(m);
}
bp->b_resid = 0;
bp->b_error = 0;
biodone(bio);
} else {
nbio = push_bio(bio);
nbio->bio_done = tmpfs_strategy_done;
nbio->bio_offset = bio->bio_offset;
swap_pager_strategy(uobj, nbio);
}
lwkt_reltoken(&vp->v_mount->mnt_token);
return 0;
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*
* In order to be able to swap to a file, the VOP_BMAP operation may not
* deadlock on memory. See hpfs_bmap() for details. XXXXXXX (not impl)
*
* hpfs_strategy(struct vnode *a_vp, struct bio *a_bio)
*/
int
hpfs_strategy(struct vop_strategy_args *ap)
{
struct bio *bio = ap->a_bio;
struct bio *nbio;
struct buf *bp = bio->bio_buf;
struct vnode *vp = ap->a_vp;
struct hpfsnode *hp;
int error;
dprintf(("hpfs_strategy(): \n"));
if (vp->v_type == VBLK || vp->v_type == VCHR)
panic("hpfs_strategy: spec");
nbio = push_bio(bio);
if (nbio->bio_offset == NOOFFSET) {
error = VOP_BMAP(vp, bio->bio_offset, &nbio->bio_offset,
NULL, NULL, bp->b_cmd);
if (error) {
kprintf("hpfs_strategy: VOP_BMAP FAILED %d\n", error);
bp->b_error = error;
bp->b_flags |= B_ERROR;
/* I/O was never started on nbio, must biodone(bio) */
biodone(bio);
return (error);
}
if (nbio->bio_offset == NOOFFSET)
vfs_bio_clrbuf(bp);
}
if (nbio->bio_offset == NOOFFSET) {
/* I/O was never started on nbio, must biodone(bio) */
biodone(bio);
return (0);
}
hp = VTOHP(ap->a_vp);
vn_strategy(hp->h_devvp, nbio);
return (0);
}
