linux-kernel - Re: [PATCH v2 00/10] evacuate struct page from the block layer, introduce __pfn

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Message-ID: <CA+55aFyK==+bMHMdfaP4EHjUNseoTWu1-pp2M2WyLVN73ig+_g@mail.gmail.com>
Date:	Thu, 7 May 2015 08:58:41 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Boaz Harrosh <boaz@...xistor.com>, Jan Kara <jack@...e.cz>,
	Mike Snitzer <snitzer@...hat.com>, Neil Brown <neilb@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Chris Mason <clm@...com>, Paul Mackerras <paulus@...ba.org>,
	"H. Peter Anvin" <hpa@...or.com>, Christoph Hellwig <hch@....de>,
	Alasdair Kergon <agk@...hat.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Jens Axboe <axboe@...nel.dk>, "Theodore Ts'o" <tytso@....edu>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Julia Lawall <Julia.Lawall@...6.fr>, Tejun Heo <tj@...nel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 00/10] evacuate struct page from the block layer,
 introduce __pfn_t

On Thu, May 7, 2015 at 8:40 AM, Dan Williams <dan.j.williams@...el.com> wrote:
>
> blkdev_get(FMODE_EXCL) is the protection in this case.

Ugh. That looks like a horrible nasty big hammer that will bite us
badly some day. Since you'd have to hold it for the whole IO. But I
guess it at least works.

Anyway, I did want to say that while I may not be convinced about the
approach, I think the patches themselves don't look horrible. I
actually like your "__pfn_t". So while I (very obviously) have some
doubts about this approach, it may be that the most convincing
argument is just in the code.

                            Linus
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