linux-kernel - Re: [patch] scsi: revert "[SCSI] Get rid of scsi

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Message-Id: <1199630574.5205.14.camel@localhost.localdomain>
Date:	Sun, 06 Jan 2008 08:42:54 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Osterlund <petero2@...ia.com>,
	Matthew Wilcox <matthew@....cx>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [patch] scsi: revert "[SCSI] Get rid of scsi_cmnd->done"

On Sat, 2008-01-05 at 19:43 -0800, Linus Torvalds wrote:
>  fs/block_dev.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 993f78c..6a20da9 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -1191,6 +1191,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
>  			}
>  			if (bdev->bd_invalidated)
>  				rescan_partitions(bdev->bd_disk, bdev);
> +			bd_inode->i_size = (loff_t)get_capacity(disk)<<9;
>  		}
>  	}
>  	bdev->bd_openers++;

Actually, I think that code is fine ... the block size shouldn't change
across positive values of bd_openers.  I think the true fix is below:
pktcdvd shouldn't be mucking with the size of the underlying CD/DVD ...
it can change its own layered device capacity, certainly, but it
shouldn't be mucking with the capacity that was already set in the
sr_probe routine.  I'm in two minds as to whether the set capacity on
the underlying device should be removed as well ... I think it should,
but it is harmless as the sr_probe will also reset it.

However, I'll defer to what Al wants to do.

James

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 3535ef8..10f3692 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2344,7 +2344,6 @@ static int pkt_open_dev(struct pktcdvd_device *pd, int write)
 
 	set_capacity(pd->disk, lba << 2);
 	set_capacity(pd->bdev->bd_disk, lba << 2);
-	bd_set_size(pd->bdev, (loff_t)lba << 11);
 
 	q = bdev_get_queue(pd->bdev);
 	if (write) {


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