Author: kib
Date: Sat Jul 13 19:36:18 2013
New Revision: 253327
URL: http://svnweb.freebsd.org/changeset/base/253327
Log:
Assert that runningbufspace does not underflow.
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/kern/vfs_bio.c
Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c Sat Jul 13 19:34:34 2013 (r253326)
+++ head/sys/kern/vfs_bio.c Sat Jul 13 19:36:18 2013 (r253327)
@@ -474,10 +474,12 @@ runningbufwakeup(struct buf *bp)
{
long space, bspace;
- if (bp->b_runningbufspace == 0)
- return;
- space = atomic_fetchadd_long(&runningbufspace, -bp->b_runningbufspace);
bspace = bp->b_runningbufspace;
+ if (bspace == 0)
+ return;
+ space = atomic_fetchadd_long(&runningbufspace, -bspace);
+ KASSERT(space >= bspace, ("runningbufspace underflow %ld %ld",
+ space, bspace));
bp->b_runningbufspace = 0;
/*
* Only acquire the lock and wakeup on the transition from exceeding
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