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When preparing to swap to a miniroot partition, add a little

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padding to our estimate of the miniroot's size, to avoid
overwriting it.
This commit is contained in:
fredette 2002-05-09 21:43:44 +00:00
parent 858f46fb43
commit c857df5775
1 changed files with 16 additions and 2 deletions
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18
sys/uvm/uvm_swap.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_swap.c,v 1.63 2002/04/01 12:24:11 manu Exp $ */
/* $NetBSD: uvm_swap.c,v 1.64 2002/05/09 21:43:44 fredette Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Matthew R. Green
@ -32,7 +32,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_swap.c,v 1.63 2002/04/01 12:24:11 manu Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_swap.c,v 1.64 2002/05/09 21:43:44 fredette Exp $");
#include "fs_nfs.h"
#include "opt_uvmhist.h"
@ -906,6 +906,20 @@ swap_on(p, sdp)
mp = rootvnode->v_mount;
sp = &mp->mnt_stat;
rootblocks = sp->f_blocks * btodb(sp->f_bsize);
/*
* XXX: sp->f_blocks isn't the total number of
* blocks in the filesystem, it's the number of
* data blocks. so, our rootblocks almost
* definitely underestimates the total size
* of the filesystem - how badly depends on the
* details of the filesystem type. there isn't
* an obvious way to deal with this cleanly
* and perfectly, so for now we just pad our
* rootblocks estimate with an extra 5 percent.
*/
rootblocks += (rootblocks >> 5) +
(rootblocks >> 6) +
(rootblocks >> 7);
rootpages = round_page(dbtob(rootblocks)) >> PAGE_SHIFT;
if (rootpages > size)
panic("swap_on: miniroot larger than swap?");