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From:   Dai Ngo <dai.ngo@oracle.com>
To:     trondmy@hammerspace.com
Cc:     linux-nfs@vger.kernel.org
Subject: [PATCH 1/1] NFSv4.2: remove restriction of copy size for inter-server copy
Date:   Tue, 13 Jul 2021 14:27:08 -0400
Message-Id: <20210713182708.58378-1-dai.ngo@oracle.com>
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Currently inter-server copy is allowed only if the copy size is larger
than (rsize*14) which is the over-head of the mount operation of the
source export. This patch removes this restriction since the client
should not rely on how the server implements the inter-server copy.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
---
 fs/nfs/nfs4file.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index c820de58a661..c91565227ea2 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -158,13 +158,11 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
 		sync = true;
 retry:
 	if (!nfs42_files_from_same_server(file_in, file_out)) {
-		/* for inter copy, if copy size if smaller than 12 RPC
-		 * payloads, fallback to traditional copy. There are
-		 * 14 RPCs during an NFSv4.x mount between source/dest
-		 * servers.
+		/*
+		 * for inter copy, if copy size is too small
+		 * then fallback to generic copy.
 		 */
-		if (sync ||
-			count <= 14 * NFS_SERVER(file_inode(file_in))->rsize)
+		if (sync)
 			return -EOPNOTSUPP;
 		cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
 				GFP_NOFS);
-- 
2.9.5