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Fix problem with freeing busy pages reported by Nick Sayer.

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Submitted by:	 John Dyson
This commit is contained in:
dg 1995-01-26 03:34:31 +00:00
parent 51f61ec9ba
commit 66555ce307
1 changed files with 6 additions and 4 deletions
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10
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 1.24 1995/01/21 06:32:26 ache Exp $
* $Id: vfs_bio.c,v 1.25 1995/01/24 10:00:43 davidg Exp $
*/
/*
@ -888,7 +888,7 @@ allocbuf(struct buf * bp, int size, int vmio)
for (i = desiredpages; i < bp->b_npages; i++) {
m = bp->b_pages[i];
s = splhigh();
if ((m->flags & PG_BUSY) || (m->busy != 0)) {
while ((m->flags & PG_BUSY) || (m->busy != 0)) {
m->flags |= PG_WANTED;
tsleep(m, PVM, "biodep", 0);
}
@ -901,8 +901,10 @@ allocbuf(struct buf * bp, int size, int vmio)
--m->bmapped;
if (m->bmapped == 0) {
PAGE_WAKEUP(m);
pmap_page_protect(VM_PAGE_TO_PHYS(m), VM_PROT_NONE);
vm_page_free(m);
if (m->valid == 0) {
pmap_page_protect(VM_PAGE_TO_PHYS(m), VM_PROT_NONE);
vm_page_free(m);
}
}
bp->b_pages[i] = NULL;
}