linux-kernel - Re: [PATCH 08/11] filemap: add get_page_for

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]

Date:   Tue, 27 Sep 2016 04:43:38 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Miklos Szeredi <mszeredi@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/11] filemap: add get_page_for_read() helper

On Wed, Sep 14, 2016 at 10:37:13AM +0200, Miklos Szeredi wrote:
> Getting the page for reading is pretty complicated.  This functionality is
> also duplicated between generic_file_read() generic_file_splice_read().
> 
> So first extract the common code from do_generic_file_read() into a
> separate helper function that takes a filp, the page index, the offset into
> the page and the byte count and returns the page ready for reading (or an
> error).
> 
> This makes do_generic_file_read() much easier to read as well.

__generic_file_splice_read() horrors are not going to survive - see the
patchset posted on fsdevel.  do_generic_file_read() getting easier to
read is certainly a good thing, provided that we don't screw the code
generation for what's a fairly hot path.  IOW, that one really needs
profiling.