This is a tentitive fix for the vn device problems reported earlier.
It has not been well tested. Basically, the vn device tries to
do something different for B_PAGING bp's to get around potential
low-memory deadlocks. Previously this only applied to paging/swapping,
and the swapper doesn't care about b_resid. However, part of the VM update
in -4.x extends this flag for use in vm_fault paging and other similar
situations. The VN code takes an alternate path for B_PAGING which has
not been well tested due to it being previously restricted to swapper
requested only. There could be more bugs in the section of vn. I'll
run more sophisticated tests ( buildworlds and ports builds and such )
next week, replacing my MFS testbed with a VN testbed.
-Matt
Matthew Dillon
<dil...@backplane.com>
Index: vn.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/vn/vn.c,v
retrieving revision 1.73
diff -u -r1.73 vn.c
--- vn.c 1999/01/23 00:28:56 1.73
+++ vn.c 1999/01/30 08:03:41
@@ -411,6 +411,7 @@
addr += sz;
resid -= sz;
}
+ bp->b_resid = resid;
biodone(bp);
putvnbuf(nbp);
}
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