staging: lustre: llite: enable clients to inject error for lfsck

This enables the client to inject an error by altering
the parent FID in order to test if the server side file
system checker behaves properly.
Signed-off-by: Fan Yong <fan.yong@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3951
Reviewed-on: http://review.whamcloud.com/7667Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/obd_support.h

@@ -474,6 +474,7 @@ extern char obd_jobid_var[];
 #define OBD_FAIL_LFSCK_CRASH		0x160a
 #define OBD_FAIL_LFSCK_NO_AUTO		0x160b
 #define OBD_FAIL_LFSCK_NO_DOUBLESCAN	0x160c
+#define OBD_FAIL_LFSCK_INVALID_PFID	0x1619
 
 /* UPDATE */
 #define OBD_FAIL_UPDATE_OBJ_NET			0x1700

drivers/staging/lustre/lustre/llite/vvp_req.c

@@ -83,6 +83,8 @@ static void vvp_req_attr_set(const struct lu_env *env,
 	}
 	obdo_from_inode(oa, inode, valid_flags & flags);
 	obdo_set_parent_fid(oa, &ll_i2info(inode)->lli_fid);
+	if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_INVALID_PFID))
+		oa->o_parent_oid++;
 	memcpy(attr->cra_jobid, ll_i2info(inode)->lli_jobid,
 	       JOBSTATS_JOBID_SIZE);
 }