linux-kernel - Re: [PATCH] mm/zswap: provide unique zpool name

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: <20160428151647.8bbf279a7d937a1b017ca003@linux-foundation.org>
Date:	Thu, 28 Apr 2016 15:16:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dan Streetman <ddstreet@...e.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Seth Jennings <sjenning@...hat.com>,
	Yu Zhao <yuzhao@...gle.com>, Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>, Linux-MM <linux-mm@...ck.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dan Streetman <dan.streetman@...onical.com>
Subject: Re: [PATCH] mm/zswap: provide unique zpool name

On Thu, 28 Apr 2016 05:13:23 -0400 Dan Streetman <ddstreet@...e.org> wrote:

> Instead of using "zswap" as the name for all zpools created, add
> an atomic counter and use "zswap%x" with the counter number for each
> zpool created, to provide a unique name for each new zpool.
> 
> As zsmalloc, one of the zpool implementations, requires/expects a
> unique name for each pool created, zswap should provide a unique name.
> The zsmalloc pool creation does not fail if a new pool with a
> conflicting name is created, unless CONFIG_ZSMALLOC_STAT is enabled;
> in that case, zsmalloc pool creation fails with -ENOMEM.  Then zswap
> will be unable to change its compressor parameter if its zpool is
> zsmalloc; it also will be unable to change its zpool parameter back
> to zsmalloc, if it has any existing old zpool using zsmalloc with
> page(s) in it.  Attempts to change the parameters will result in
> failure to create the zpool.  This changes zswap to provide a
> unique name for each zpool creation.
> 
> Fixes: f1c54846ee45 ("zswap: dynamic pool creation")

September 2015.  I added a cc:stable to this one.

> Reported-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Cc: Dan Streetman <dan.streetman@...onical.com>
> Signed-off-by: Dan Streetman <ddstreet@...e.org>