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Rework vm_hold_{load,free}_pages to calculate an index once and use that.

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At the same time, be sure to page-truncate bp->b_data so that the result
of the calculation isn't negative.
This commit is contained in:
David Greenman 1996-01-06 23:23:02 +00:00
parent 659f340ca4
commit 2199f986f1
1 changed files with 13 additions and 11 deletions
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24
sys/kern/vfs_bio.c
View file

@ -18,7 +18,7 @@
* 5. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vfs_bio.c,v 1.80 1996/01/04 06:09:00 davidg Exp $
* $Id: vfs_bio.c,v 1.81 1996/01/05 20:12:33 wollman Exp $
*/
/*
@ -1605,14 +1605,14 @@ vfs_bio_clrbuf(struct buf *bp) {
* not associated with a file object.
*/
void
vm_hold_load_pages(struct buf * bp, vm_offset_t froma, vm_offset_t toa)
vm_hold_load_pages(struct buf * bp, vm_offset_t from, vm_offset_t to)
{
vm_offset_t pg;
vm_page_t p;
vm_offset_t from = round_page(froma);
vm_offset_t to = round_page(toa);
for (pg = from; pg < to; pg += PAGE_SIZE) {
to = round_page(to);
for (pg = round_page(from); pg < to; pg += PAGE_SIZE) {
tryagain:
@ -1624,22 +1624,24 @@ tryagain:
}
vm_page_wire(p);
pmap_kenter(pg, VM_PAGE_TO_PHYS(p));
bp->b_pages[((caddr_t) pg - bp->b_data) >> PAGE_SHIFT] = p;
bp->b_pages[(pg - trunc_page(bp->b_data)) >> PAGE_SHIFT] = p;
PAGE_WAKEUP(p);
bp->b_npages++;
}
}
void
vm_hold_free_pages(struct buf * bp, vm_offset_t froma, vm_offset_t toa)
vm_hold_free_pages(struct buf * bp, vm_offset_t from, vm_offset_t to)
{
vm_offset_t pg;
vm_page_t p;
vm_offset_t from = round_page(froma);
vm_offset_t to = round_page(toa);
int index;
for (pg = from; pg < to; pg += PAGE_SIZE) {
int index = ((caddr_t) pg - bp->b_data) >> PAGE_SHIFT;
from = round_page(from);
to = round_page(to);
index = (from - trunc_page(bp->b_data)) >> PAGE_SHIFT;
for (pg = from; pg < to; pg += PAGE_SIZE, index++) {
p = bp->b_pages[index];
bp->b_pages[index] = 0;
pmap_kremove(pg);