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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 29 Nov 2012 11:55:09 -0800
Message-ID: <CA+55aFzosQ+Jo6fH2qr5s5YDPvW=CkTGokOLB0tYjZp6ujj3Nw@mail.gmail.com>
Subject: Re: [PATCH v2] Do a proper locking for mmap and block size change
To: Chris Mason <chris.mason@fusionio.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Chris Mason <clmason@fusionio.com>,
        Mikulas Patocka <mpatocka@redhat.com>,
        Al Viro <viro@zeniv.linux.org.uk>, Jens Axboe <axboe@kernel.dk>,
        Jeff Chua <jeff.chua.linux@gmail.com>,
        Lai Jiangshan <laijs@cn.fujitsu.com>, Jan Kara <jack@suse.cz>,
        lkml <linux-kernel@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>
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On Thu, Nov 29, 2012 at 11:48 AM, Chris Mason <chris.mason@fusionio.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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