From: Benjamin Coddington <bcodding@redhat.com>
Date: Thu, 13 Oct 2022 11:58:01 -0400
Subject: [PATCH] NFSv4.2: Fixup CLONE dest file size for zero-length count
Git-commit: 038efb6348ce96228f6828354cb809c22a661681
Patch-mainline: v6.1
References: git-fixes

When holding a delegation, the NFS client optimizes away setting the
attributes of a file from the GETATTR in the compound after CLONE, and for
a zero-length CLONE we will end up setting the inode's size to zero in
nfs42_copy_dest_done().  Handle this case by computing the resulting count
from the server's reported size after CLONE's GETATTR.

Suggested-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Fixes: 94d202d5ca39 ("NFSv42: Copy offload should update the file size when appropriate")
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 fs/nfs/nfs42proc.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -561,6 +561,9 @@ static int _nfs42_proc_clone(struct rpc_
 	status = nfs4_call_sync(server->client, server, msg,
 				&args.seq_args, &res.seq_res, 0);
 	if (status == 0) {
+		/* a zero-length count means clone to EOF in src */
+		if (count == 0 && res.dst_fattr->valid & NFS_ATTR_FATTR_SIZE)
+			count = nfs_size_to_loff_t(res.dst_fattr->size) - dst_offset;
 		nfs42_copy_dest_done(dst_inode, dst_offset, count);
 		status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 	}