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Make uvn_findpages to return number of pages found so that caller can

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easily check if all requested pages are found or not.
This commit is contained in:
enami 2002-05-17 22:00:50 +00:00
parent 36efaa3565
commit 2afb4efc4c
2 changed files with 20 additions and 13 deletions
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4
sys/uvm/uvm_extern.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_extern.h,v 1.70 2001/12/10 01:52:26 thorpej Exp $ */
/* $NetBSD: uvm_extern.h,v 1.71 2002/05/17 22:00:50 enami Exp $ */
/*
*
@ -681,7 +681,7 @@ void uvm_deallocate __P((struct vm_map *, vaddr_t, vsize_t));
void uvm_vnp_setsize __P((struct vnode *, voff_t));
void uvm_vnp_sync __P((struct mount *));
struct uvm_object *uvn_attach __P((void *, vm_prot_t));
void uvn_findpages __P((struct uvm_object *, voff_t,
int uvn_findpages __P((struct uvm_object *, voff_t,
int *, struct vm_page **, int));
void uvm_vnp_zerorange __P((struct vnode *, off_t, size_t));

29
sys/uvm/uvm_vnode.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_vnode.c,v 1.57 2001/12/31 07:00:15 chs Exp $ */
/* $NetBSD: uvm_vnode.c,v 1.58 2002/05/17 22:00:50 enami Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -50,7 +50,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_vnode.c,v 1.57 2001/12/31 07:00:15 chs Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_vnode.c,v 1.58 2002/05/17 22:00:50 enami Exp $");
#include "fs_nfs.h"
#include "opt_uvmhist.h"
@ -311,7 +311,7 @@ uvn_get(uobj, offset, pps, npagesp, centeridx, access_type, advice, flags)
* => returned pages will be BUSY.
*/
void
int
uvn_findpages(uobj, offset, npagesp, pgs, flags)
struct uvm_object *uobj;
voff_t offset;
@ -319,28 +319,33 @@ uvn_findpages(uobj, offset, npagesp, pgs, flags)
struct vm_page **pgs;
int flags;
{
int i, count, npages, rv;
int i, count, found, npages, rv;
count = 0;
count = found = 0;
npages = *npagesp;
if (flags & UFP_BACKWARD) {
for (i = npages - 1; i >= 0; i--, offset -= PAGE_SIZE) {
rv = uvn_findpage(uobj, offset, &pgs[i], flags);
if (flags & UFP_DIRTYONLY && rv == 0) {
break;
}
if (rv == 0) {
if (flags & UFP_DIRTYONLY)
break;
} else
found++;
count++;
}
} else {
for (i = 0; i < npages; i++, offset += PAGE_SIZE) {
rv = uvn_findpage(uobj, offset, &pgs[i], flags);
if (flags & UFP_DIRTYONLY && rv == 0) {
break;
}
if (rv == 0) {
if (flags & UFP_DIRTYONLY)
break;
} else
found++;
count++;
}
}
*npagesp = count;
return (found);
}
int
@ -399,6 +404,7 @@ uvn_findpage(uobj, offset, pgp, flags)
return 0;
}
pg->flags |= PG_WANTED;
UVMHIST_LOG(ubchist, "wait %p", pg,0,0,0);
UVM_UNLOCK_AND_WAIT(pg, &uobj->vmobjlock, 0,
"uvn_fp2", 0);
simple_lock(&uobj->vmobjlock);
@ -417,6 +423,7 @@ uvn_findpage(uobj, offset, pgp, flags)
(pg->flags & PG_CLEAN) == 0;
pg->flags |= PG_CLEAN;
if (!dirty) {
UVMHIST_LOG(ubchist, "dirtonly", 0,0,0,0);
return 0;
}
}