linux-kernel - Re: [PATCH v2] Do a proper locking for mmap and block size change

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Date:	Thu, 29 Nov 2012 11:55:09 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Chris Mason <chris.mason@...ionio.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Mason <clmason@...ionio.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <axboe@...nel.dk>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Lai Jiangshan <laijs@...fujitsu.com>, Jan Kara <jack@...e.cz>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2] Do a proper locking for mmap and block size change

On Thu, Nov 29, 2012 at 11:48 AM, Chris Mason <chris.mason@...ionio.com> wrote:
>
> blkdev_get_blocks (called during DIO) is also checking i_blkbits, but I
> really don't get why that isn't byte based instead.  DIO is already
> doing the shift & mask game.

The blkdev_get_blocks() this is just sad.

The underlying data structure is actually byte-based (it's
"i_size_read(bdev->bd_inode"), but we convert it to a block-based
number.

Oops.

           Linus
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