linux-kernel - Re: block: optionally snapshot page contents to provide stable pages during write

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Message-ID: <CA+icZUXsi0jZZE9HBWG0D6-+oJBeX+8nHpZ9F02x=B7dG3X+yg@mail.gmail.com>
Date:	Sat, 26 Jan 2013 13:39:46 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>
Subject: Re: block: optionally snapshot page contents to provide stable pages
 during write

Hi Darrick,

can you tell me why you do not put your help text where it normally
belongs ("help" Kconfig item)?

273 # We also use the bounce pool to provide stable page writes for jbd.  jbd
274 # initiates buffer writeback without locking the page or setting
PG_writeback,
275 # and fixing that behavior (a second time; jbd2 doesn't have this
problem) is
276 # a major rework effort.  Instead, use the bounce buffer to snapshot pages
277 # (until jbd goes away).  The only jbd user is ext3.
278 config NEED_BOUNCE_POOL
279         bool
280         default y if (TILE && USB_OHCI_HCD) || (BLK_DEV_INTEGRITY && JBD)
281         help
282         line #273..277

Noticed while hunting a culprit commit in Linux-Next as my
kernel-config got changed between next-20130123..next-20130124.

Regards,
- Sedat -

[1] http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commitdiff;h=3f1c22e#patch5
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