linux-kernel - Re: [PATCH] fs/read_write: Enable copy_file

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230724164017.GC26430@lst.de>
Date:   Mon, 24 Jul 2023 18:40:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Nitesh Shetty <nj.shetty@...sung.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>, hch@....de,
        gost.dev@...sung.com, Anuj Gupta <anuj20.g@...sung.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs/read_write: Enable copy_file_range for block device.

>  {
> -	struct inode *inode_in = file_inode(file_in);
> -	struct inode *inode_out = file_inode(file_out);
> +	struct inode *inode_in = file_in->f_mapping->host;
> +	struct inode *inode_out = file_out->f_mapping->host;

This doesn't directly have anything to do with block devices, as regular
files can also have a f_mapping that's different.  None of the file
systems actually supporting copy offload right now do, but changing
the dereference here is a correctness thing totally independent of
block device support.