linux-kernel - Re: [PATCH] Fix queueing work if !bdi_cap_writeback

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Message-ID: <87a9wueayc.fsf@devron.myhome.or.jp>
Date:	Thu, 13 Sep 2012 14:41:31 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	viro@...iv.linux.org.uk, jack@...e.cz, hch@....de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix queueing work if !bdi_cap_writeback_dirty()

Fengguang Wu <fengguang.wu@...el.com> writes:

>> If used custom bdi with BDI_CAP_NO_WRITEBACK, wait_for_completion()
>> (e.g. sync_inodes_sb()) will be blocked forever.
>
> The sync(2) block cannot be fixed by this patch?

This patch fixes block problem too.

>> I tested by custom bdi with BDI_CAP_NO_WRITEBACK - sync(2) blocked
>> forever by this reason.
>
> What's your test script? How do you create/use that custom bdi?

Ah, I wrote my kernel module to test. I guess there is no users in
current kernel for now, because it doesn't work.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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