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When a reference is made to a hole in a swap file, panic. The optimal 

thing would be to allocate the block, but I don't know how to do this.
The panic is preferable to the random memory corruption the old code
was causing.
This commit is contained in:
marc 1998-12-26 06:25:59 +00:00
parent ea8f01b987
commit e21b4568e2
1 changed files with 13 additions and 2 deletions
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15
sys/uvm/uvm_swap.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_swap.c,v 1.22 1998/11/08 19:41:49 mycroft Exp $ */
/* $NetBSD: uvm_swap.c,v 1.23 1998/12/26 06:25:59 marc Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Matthew R. Green
@ -1282,8 +1282,19 @@ sw_reg_strategy(sdp, bp, bn)
error = VOP_BMAP(sdp->swd_vp, byteoff / sdp->swd_bsize,
&vp, &nbn, &nra);
if (error == 0 && (long)nbn == -1)
if (error == 0 && (long)nbn == -1) {
/*
* this used to just set error, but that doesn't
* do the right thing. Instead, it causes random
* memory errors. The panic() should remain until
* this condition doesn't destabilize the system.
*/
#if 1
panic("sw_reg_strategy: swap to sparse file");
#else
error = EIO; /* failure */
#endif
}
/*
* punt if there was an error or a hole in the file.