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From: Jeff Roberson <jeff@FreeBSD.org>
Date: Thu, 6 Mar 2014 00:10:07 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r262812 - head/sys/ufs/ufs
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Author: jeff
Date: Thu Mar  6 00:10:07 2014
New Revision: 262812
URL: http://svnweb.freebsd.org/changeset/base/262812

Log:
   - Gracefully handle truncation failures when trying to shrink directories.
     This could cause dirhash panics since the dirhash state would be
     successfully truncated while the directory was not.
  
  Reported by:	pho
  Discussed with:	mckusick
  Sponsored by:	EMC / Isilon Storage Division
  MFC after:	2 weeks

Modified:
  head/sys/ufs/ufs/ufs_lookup.c

Modified: head/sys/ufs/ufs/ufs_lookup.c
==============================================================================
--- head/sys/ufs/ufs/ufs_lookup.c	Wed Mar  5 23:37:25 2014	(r262811)
+++ head/sys/ufs/ufs/ufs_lookup.c	Thu Mar  6 00:10:07 2014	(r262812)
@@ -1130,12 +1130,15 @@ ufs_direnter(dvp, tvp, dirp, cnp, newdir
 	    dp->i_endoff && dp->i_endoff < dp->i_size) {
 		if (tvp != NULL)
 			VOP_UNLOCK(tvp, 0);
+		error = UFS_TRUNCATE(dvp, (off_t)dp->i_endoff,
+		    IO_NORMAL | IO_SYNC, cr);
+		if (error != 0)
+			vprint("ufs_direnter: failted to truncate", dvp);
 #ifdef UFS_DIRHASH
-		if (dp->i_dirhash != NULL)
+		if (error == 0 && dp->i_dirhash != NULL)
 			ufsdirhash_dirtrunc(dp, dp->i_endoff);
 #endif
-		(void) UFS_TRUNCATE(dvp, (off_t)dp->i_endoff,
-		    IO_NORMAL | IO_SYNC, cr);
+		error = 0;
 		if (tvp != NULL)
 			vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY);
 	}