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Fix a rounding problem that causes vnode pager to fail to remove the last 

partially filled page during a truncation.

PR:		kern/7422
This commit is contained in:
Luoqi Chen 1998-08-25 13:47:37 +00:00
parent 4591e62dc7
commit c576d12115
1 changed files with 9 additions and 11 deletions
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20
sys/vm/vnode_pager.c
View File

@ -38,7 +38,7 @@
* SUCH DAMAGE.
*
* from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
* $Id: vnode_pager.c,v 1.94 1998/07/11 11:30:46 bde Exp $
* $Id: vnode_pager.c,v 1.95 1998/08/24 08:39:38 dfr Exp $
*/
/*
@ -253,6 +253,7 @@ vnode_pager_setsize(vp, nsize)
struct vnode *vp;
vm_ooffset_t nsize;
{
vm_pindex_t nobjsize;
vm_object_t object = vp->v_object;
if (object == NULL)
@ -264,19 +265,16 @@ vnode_pager_setsize(vp, nsize)
if (nsize == object->un_pager.vnp.vnp_size)
return;
nobjsize = OFF_TO_IDX(nsize + PAGE_MASK);
/*
* File has shrunk. Toss any cached pages beyond the new EOF.
*/
if (nsize < object->un_pager.vnp.vnp_size) {
vm_ooffset_t nsizerounded;
nsizerounded = IDX_TO_OFF(OFF_TO_IDX(nsize + PAGE_MASK));
if (nsizerounded < object->un_pager.vnp.vnp_size) {
vm_pindex_t st, end;
st = OFF_TO_IDX(nsize + PAGE_MASK);
end = OFF_TO_IDX(object->un_pager.vnp.vnp_size);
vm_freeze_copyopts(object, OFF_TO_IDX(nsize), object->size);
vm_object_page_remove(object, st, end, FALSE);
vm_freeze_copyopts(object, OFF_TO_IDX(nsize), object->size);
if (nobjsize < object->size) {
vm_object_page_remove(object, nobjsize, object->size,
FALSE);
}
/*
* this gets rid of garbage at the end of a page that is now
@ -296,7 +294,7 @@ vnode_pager_setsize(vp, nsize)
}
}
object->un_pager.vnp.vnp_size = nsize;
object->size = OFF_TO_IDX(nsize + PAGE_MASK);
object->size = nobjsize;
}
void