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Date:      Sun, 28 Feb 2010 17:15:45 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r204472 - head/sys/fs/msdosfs
Message-ID:  <201002281715.o1SHFj4h041408@svn.freebsd.org>
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Author: kib
Date: Sun Feb 28 17:15:45 2010
New Revision: 204472
URL: http://svn.freebsd.org/changeset/base/204472

Log:
  Add assertions for FAT bitmap state.
  
  Tested by:	pho
  MFC after:	3 weeks

Modified:
  head/sys/fs/msdosfs/msdosfs_fat.c

Modified: head/sys/fs/msdosfs/msdosfs_fat.c
==============================================================================
--- head/sys/fs/msdosfs/msdosfs_fat.c	Sun Feb 28 17:13:59 2010	(r204471)
+++ head/sys/fs/msdosfs/msdosfs_fat.c	Sun Feb 28 17:15:45 2010	(r204472)
@@ -413,7 +413,12 @@ usemap_alloc(pmp, cn)
 {
 
 	MSDOSFS_ASSERT_MP_LOCKED(pmp);
+
+	KASSERT((pmp->pm_inusemap[cn / N_INUSEBITS] & (1 << (cn % N_INUSEBITS)))
+	    == 0, ("Allocating used sector %ld %ld %x", cn, cn % N_INUSEBITS,
+		(unsigned)pmp->pm_inusemap[cn / N_INUSEBITS]));
 	pmp->pm_inusemap[cn / N_INUSEBITS] |= 1 << (cn % N_INUSEBITS);
+	KASSERT(pmp->pm_freeclustercount > 0, ("usemap_alloc: too little"));
 	pmp->pm_freeclustercount--;
 }
 
@@ -425,6 +430,9 @@ usemap_free(pmp, cn)
 
 	MSDOSFS_ASSERT_MP_LOCKED(pmp);
 	pmp->pm_freeclustercount++;
+	KASSERT((pmp->pm_inusemap[cn / N_INUSEBITS] & (1 << (cn % N_INUSEBITS)))
+	    != 0, ("Freeing unused sector %ld %ld %x", cn, cn % N_INUSEBITS,
+		(unsigned)pmp->pm_inusemap[cn / N_INUSEBITS]));
 	pmp->pm_inusemap[cn / N_INUSEBITS] &= ~(1 << (cn % N_INUSEBITS));
 }

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