NFSv4.2: error out when relink swapfile

This fixes xfstests generic/356 failure on NFSv4.2.

Signed-off-by: Murphy Zhou <jencce.kernel@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 1297919e0fce3173c7dee30d26d68e00a25e4125..8e5d6223ddd359917186541d70ec158888b9e515 100644 (file)
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -252,6 +252,9 @@ static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
        if (remap_flags & ~REMAP_FILE_ADVISORY)
                return -EINVAL;
 
+       if (IS_SWAPFILE(dst_inode) || IS_SWAPFILE(src_inode))
+               return -ETXTBSY;
+
        /* check alignment w.r.t. clone_blksize */
        ret = -EINVAL;
        if (bs) {