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Don't try to page to a vnode that had it's filesystem unmounted.

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This commit is contained in:
dg 1994-11-24 14:43:22 +00:00
parent 68acac5e76
commit bbd60ec5ee
1 changed files with 23 additions and 7 deletions
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30
sys/vm/vnode_pager.c
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@ -37,7 +37,7 @@
* SUCH DAMAGE.
*
* from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
* $Id: vnode_pager.c,v 1.16 1994/11/13 22:48:55 davidg Exp $
* $Id: vnode_pager.c,v 1.17 1994/11/17 01:22:45 gibbs Exp $
*/
/*
@ -284,18 +284,20 @@ vnode_pager_haspage(pager, offset)
vm_offset_t offset;
{
register vn_pager_t vnp = (vn_pager_t) pager->pg_data;
register struct vnode *vp = vnp->vnp_vp;
daddr_t bn;
int err;
daddr_t block;
/*
* Offset beyond end of file, do not have the page
* If filesystem no longer mounted or offset beyond end of
* file we do not have the page.
*/
if (offset >= vnp->vnp_size)
return (FALSE);
if ((vp->v_mount == NULL) || (offset >= vnp->vnp_size))
return FALSE;
block = offset / vnp->vnp_vp->v_mount->mnt_stat.f_iosize;
if (incore(vnp->vnp_vp, block))
block = offset / vp->v_mount->mnt_stat.f_iosize;
if (incore(vp, block))
return TRUE;
/*
* Read the index to find the disk block to read from. If there is no
@ -303,7 +305,7 @@ vnode_pager_haspage(pager, offset)
*
* Assumes that the vnode has whole page or nothing.
*/
err = VOP_BMAP(vnp->vnp_vp, block, (struct vnode **) 0, &bn, 0);
err = VOP_BMAP(vp, block, (struct vnode **) 0, &bn, 0);
/*
printf("vnode_pager_haspage: (%d)0x%x: err: %d, bn: %d\n",
offset, offset, err, bn);
@ -791,6 +793,13 @@ vnode_pager_input(vnp, m, count, reqpage)
paging_offset = object->paging_offset;
vp = vnp->vnp_vp;
/*
* Make sure underlying filesystem is still mounted.
*/
if (vp->v_mount == NULL)
return VM_PAGER_FAIL;
bsize = vp->v_mount->mnt_stat.f_iosize;
/* get the UNDERLYING device for the file with VOP_BMAP() */
@ -1317,6 +1326,13 @@ retryoutput:
paging_offset = object->paging_offset;
vp = vnp->vnp_vp;
/*
* Make sure underlying filesystem is still mounted.
*/
if (vp->v_mount == NULL)
return VM_PAGER_FAIL;
bsize = vp->v_mount->mnt_stat.f_iosize;
for (i = 0; i < count; i++)