linux-kernel - [PATCH] cifs: Fix smb3_insert_range() to move the zero

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Date: Wed, 22 May 2024 09:38:48 +0100
From: David Howells <dhowells@...hat.com>
To: Steve French <sfrench@...ba.org>
cc: dhowells@...hat.com, Shyam Prasad N <nspmangalore@...il.com>,
    Rohith Surabattula <rohiths.msft@...il.com>,
    Jeff Layton <jlayton@...nel.org>,
    Christian Brauner <brauner@...nel.org>, linux-cifs@...r.kernel.org,
    netfs@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
    linux-kernel@...r.kernel.org
Subject: [PATCH] cifs: Fix smb3_insert_range() to move the zero_point

Fix smb3_insert_range() to move the zero_point over to the new EOF.
Without this, generic/147 fails as reads of data beyond the old EOF point
return zeroes.

Fixes: 3ee1a1fc3981 ("cifs: Cut over to using netfslib")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Steve French <sfrench@...ba.org>
cc: Shyam Prasad N <nspmangalore@...il.com>
cc: Rohith Surabattula <rohiths.msft@...il.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: linux-cifs@...r.kernel.org
cc: netfs@...ts.linux.dev
---
 fs/smb/client/smb2ops.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index ef18cd30f66c..b87b70edd0be 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -3636,6 +3636,7 @@ static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
 	rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len);
 	if (rc < 0)
 		goto out_2;
+	cifsi->netfs.zero_point = new_eof;
 
 	rc = smb3_zero_data(file, tcon, off, len, xid);
 	if (rc < 0)