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From: Andriy Gapon <avg@FreeBSD.org>
Date: Wed, 17 Jun 2015 11:48:01 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r284510 - stable/9/sys/boot/zfs
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Author: avg
Date: Wed Jun 17 11:48:00 2015
New Revision: 284510
URL: https://svnweb.freebsd.org/changeset/base/284510

Log:
  MFC r284025,284032: dnode_read: handle hole blocks in zfs boot code
  
  PR:		199804

Modified:
  stable/9/sys/boot/zfs/zfsimpl.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/boot/   (props changed)

Modified: stable/9/sys/boot/zfs/zfsimpl.c
==============================================================================
--- stable/9/sys/boot/zfs/zfsimpl.c	Wed Jun 17 11:47:06 2015	(r284509)
+++ stable/9/sys/boot/zfs/zfsimpl.c	Wed Jun 17 11:48:00 2015	(r284510)
@@ -1220,6 +1220,10 @@ dnode_read(const spa_t *spa, const dnode
 			ibn = bn >> ((nlevels - i - 1) * ibshift);
 			ibn &= ((1 << ibshift) - 1);
 			bp = indbp[ibn];
+			if (BP_IS_HOLE(&bp)) {
+				memset(dnode_cache_buf, 0, bsize);
+				break;
+			}
 			rc = zio_read(spa, &bp, dnode_cache_buf);
 			if (rc)
 				return (rc);