[PATCH 07/13] NFS: Reduce debugging noise from encode_compound_hdr

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When NFSDBG_XDR debugging is enabled, I see a lot of

  encode_compound: tag=

on the console.  This is noise if the tag is empty.  Some might argue
that it is noise even if the tag isn't empty...

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>

 fs/nfs/nfs4xdr.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 606852a..2fb129d 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -889,7 +889,9 @@ static void encode_compound_hdr(struct xdr_stream *xdr,
 	 * but this is not required as a MUST for the server to do so. */
 	hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
-	dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
+	if (unlikely(hdr->taglen != 0))
+		dprintk("%s: tag=%.*s\n", __func__,
+				(int)hdr->taglen, hdr->tag);
 	BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
 	p = reserve_space(xdr, 4 + hdr->taglen + 8);
 	p = xdr_encode_opaque(p, hdr->tag, hdr->taglen);

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