linux-ext4 - Re: [PATCH 2/3] mm: Provide address_space operation for filling pages for read

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: <20210120162001.GB3790454@infradead.org>
Date:   Wed, 20 Jan 2021 16:20:01 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-fsdevel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/3] mm: Provide address_space operation for filling
 pages for read

On Wed, Jan 20, 2021 at 05:06:10PM +0100, Jan Kara wrote:
> Provide an address_space operation for filling pages needed for read
> into page cache. Filesystems can use this operation to seriealize
> page cache filling with e.g. hole punching properly.

Besides the impending rewrite of the area - having another indirection
here is just horrible for performance.  If we want locking in this area
it should be in core code and common for multiple file systems.