6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Steve French stfrench@microsoft.com
commit 0e08fa789d39aa01923e3ba144bd808291895c3c upstream.
We were returning -EOPNOTSUPP for various remap_file_range cases but for some of these the copy_file_range_syscall() requires -EINVAL to be returned (e.g. where source and target file ranges overlap when source and target are the same file). This fixes xfstest generic/157 which was expecting EINVAL for that (and also e.g. for when the src offset is beyond end of file).
Cc: stable@vger.kernel.org Acked-by: Paulo Alcantara (Red Hat) pc@manguebit.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/smb/client/cifsfs.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
--- a/fs/smb/client/cifsfs.c +++ b/fs/smb/client/cifsfs.c @@ -1363,6 +1363,20 @@ static loff_t cifs_remap_file_range(stru netfs_resize_file(&target_cifsi->netfs, new_size); fscache_resize_cookie(cifs_inode_cookie(target_inode), new_size); + } else if (rc == -EOPNOTSUPP) { + /* + * copy_file_range syscall man page indicates EINVAL + * is returned e.g when "fd_in and fd_out refer to the + * same file and the source and target ranges overlap." + * Test generic/157 was what showed these cases where + * we need to remap EOPNOTSUPP to EINVAL + */ + if (off >= src_inode->i_size) { + rc = -EINVAL; + } else if (src_inode == target_inode) { + if (off + len > destoff) + rc = -EINVAL; + } } }