linux-kernel - Re: [PATCH 2/7] writeback: switch to per-bdi threads for flushing data

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:	Mon, 16 Mar 2009 06:22:53 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com, npiggin@...e.de,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/7] writeback: switch to per-bdi threads for flushing
	data

On Thu, Mar 12, 2009 at 03:33:43PM +0100, Jens Axboe wrote:
> +static void bdi_kupdated(struct backing_dev_info *bdi)
> +{
> +	long nr_to_write;
> +	struct writeback_control wbc = {
> +		.bdi		= bdi,
> +		.sync_mode	= WB_SYNC_NONE,
> +		.nr_to_write	= 0,
> +		.for_kupdate	= 1,
> +		.range_cyclic	= 1,
> +	};
> +
> +	sync_supers();

Not directly related to your patch, but can someone explain WTF
sync_supers is doing here or in the old kupdated?  We're writing back
dirty pages from the VM, and for some reason we try to also write back
superblocks.   This doesn't really make any sense.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/