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Add needed spl protection, and some minor cleanups in vfs_vmio_release.

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Submitted by:	Peter Wemm <peter@spinner.dialix.com> and me.
This commit is contained in:
John Dyson 1996-09-18 15:57:41 +00:00
parent 40e4ce5ab9
commit f9da2540d2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18358
1 changed files with 14 additions and 8 deletions
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22
sys/kern/vfs_bio.c
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@ -18,7 +18,7 @@
* 5. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vfs_bio.c,v 1.98 1996/09/08 20:44:20 dyson Exp $
* $Id: vfs_bio.c,v 1.100 1996/09/14 04:40:33 dyson Exp $
*/
/*
@ -313,6 +313,11 @@ bwrite(struct buf * bp)
curproc->p_stats->p_ru.ru_oublock++;
VOP_STRATEGY(bp);
/*
* It is possible that the buffer is reused
* before this point if B_ASYNC... What to do?
*/
/* if ((bp->b_flags & B_ASYNC) == 0) { */
if ((oldflags & B_ASYNC) == 0) {
int rtval = biowait(bp);
@ -618,20 +623,24 @@ vfs_vmio_release(bp)
struct buf *bp;
{
int i;
vm_page_t m;
for (i = 0; i < bp->b_npages; i++) {
int s;
vm_page_t m;
m = bp->b_pages[i];
bp->b_pages[i] = NULL;
s = splbio();
while ((m->flags & PG_BUSY) || (m->busy != 0)) {
m->flags |= PG_WANTED;
tsleep(m, PVM, "vmiorl", 0);
}
splx(s);
vm_page_unwire(m);
if (m->wire_count == 0) {
if (m->flags & PG_WANTED) {
m->flags &= ~PG_WANTED;
wakeup(m);
@ -645,15 +654,12 @@ vfs_vmio_release(bp)
*/
if ((vm_swap_size == 0) ||
(cnt.v_free_count < cnt.v_free_min)) {
if ((m->dirty == 0) &&
(m->hold_count == 0) &&
(m->busy == 0))
if ((m->dirty == 0) && (m->hold_count == 0))
vm_page_cache(m);
else
vm_page_deactivate(m);
}
} else if ((m->hold_count == 0) &&
(m->busy == 0)) {
} else if (m->hold_count == 0) {
vm_page_protect(m, VM_PROT_NONE);
vm_page_free(m);
}