From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Fri, 31 May 2019 21:06:05 +0000 (-0700)
Subject: nfs: disable client side deduplication
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9026b3a973b0b0b73c15ba40aff87cd0959fd0f3;p=linux.git

nfs: disable client side deduplication

The NFS protocol doesn't support deduplication, so turn it off again.

Fixes: ce96e888fe48e ("Fix nfs4.2 return -EINVAL when do dedupe operation")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 3a507c42c1cae..52dbd17e401ed 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -187,7 +187,11 @@ static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
 	bool same_inode = false;
 	int ret;
 
-	if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
+	/* NFS does not support deduplication. */
+	if (remap_flags & REMAP_FILE_DEDUP)
+		return -EOPNOTSUPP;
+
+	if (remap_flags & ~REMAP_FILE_ADVISORY)
 		return -EINVAL;
 
 	/* check alignment w.r.t. clone_blksize */