From: Artem Blagodarenko <artem_blagodarenko@xyratex.com>
Date: Mon, 29 Dec 2014 11:32:51 +0000 (+0300)
Subject: LU-6071 client: Fix mkdir -i 1 from DNE2 client to DNE1 server
X-Git-Tag: 2.6.93~20
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=426f9c0365d1e8528b07b89f1d7c0a7f2f80e3a5

LU-6071 client: Fix mkdir -i 1 from DNE2 client to DNE1 server

After DNE phase 2 has been added to client it sends
create request to slave MDT.  DNT1-only server doesn't
expect request to slave MDT from client. It expects
only cross-mdt request from master MDT. Thus if DNE2
client tries to "mkdir -i 1" on DNE1 server, then
LBUG happened.

This patch adds OBD_CONNECT_DIR_STRIPE connection
flag check on client side. If striped directories are not
supported by server, then create requrest is sent to
master MDT.

Signed-off-by: Artem Blagodarenko <artem_blagodarenko@xyratex.com>
Xyratex-bug-id: MRP-2319
Change-Id: I837a7ac144bf4aaf5039c55d03cabc0cd9847faa
Reviewed-on: http://review.whamcloud.com/13189
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
---

diff --git a/lustre/lmv/lmv_obd.c b/lustre/lmv/lmv_obd.c
index 582b7d0..69a2a3f 100644
--- a/lustre/lmv/lmv_obd.c
+++ b/lustre/lmv/lmv_obd.c
@@ -1817,14 +1817,17 @@ int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
 	rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 	if (rc)
 		RETURN(rc);
+	if (exp_connect_flags(exp) & OBD_CONNECT_DIR_STRIPE) {
+		/* Send the create request to the MDT where the object
+		 * will be located */
+		tgt = lmv_find_target(lmv, &op_data->op_fid2);
+		if (IS_ERR(tgt))
+			RETURN(PTR_ERR(tgt));
 
-	/* Send the create request to the MDT where the object
-	 * will be located */
-	tgt = lmv_find_target(lmv, &op_data->op_fid2);
-	if (IS_ERR(tgt))
-		RETURN(PTR_ERR(tgt));
-
-	op_data->op_mds = tgt->ltd_idx;
+		op_data->op_mds = tgt->ltd_idx;
+	} else {
+		CDEBUG(D_CONFIG, "Server doesn't support striped dirs\n");
+	}
 
 	CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
 	       PFID(&op_data->op_fid2), op_data->op_mds);