From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Sat, 27 Jun 2015 15:45:46 +0000 (-0400)
Subject: NFSv4.2: LAYOUTSTATS is optional to implement
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~39^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c5a0d891543873aefc3aaf846c1e7afe0982ff9;p=pandora-kernel.git

NFSv4.2: LAYOUTSTATS is optional to implement

Make it so, by checking the return value for NFS4ERR_MOTSUPP and
caching the information as a server capability.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 06c74cd93875..f486b80f927a 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -189,9 +189,15 @@ nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 	if (!nfs4_sequence_done(task, &data->res.seq_res))
 		return;
 
-	/* well, we don't care about errors at all! */
-	if (task->tk_status)
+	switch (task->tk_status) {
+	case 0:
+		break;
+	case -ENOTSUPP:
+	case -EOPNOTSUPP:
+		NFS_SERVER(data->inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
+	default:
 		dprintk("%s server returns %d\n", __func__, task->tk_status);
+	}
 }
 
 static void
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