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From: Andrew Morton <akpm@linux-foundation.org>
To: mike.miller@hp.com
Cc: "Mike Miller (OS Dev)" <mikem@beardog.cca.cpqcorp.net>,
	jens.axboe@oracle.com, linux-kernel@vger.kernel.org,
	linux-scsi@vger.kernel.org, gregkh@novell.com
Subject: Re: [Patch 1/2] cciss: fix for 2TB support
Date: Wed, 21 Feb 2007 19:14:27 -0800	[thread overview]
Message-ID: <20070221191427.9b7cf4b0.akpm@linux-foundation.org> (raw)
In-Reply-To: <20070221211039.GA2672@beardog.cca.cpqcorp.net>

On Wed, 21 Feb 2007 15:10:39 -0600 "Mike Miller (OS Dev)" <mikem@beardog.cca.cpqcorp.net> wrote:

> Patch 1/2
> 
> This patch changes the way we determine if a logical volume is larger than 2TB. The
> original test looked for a total_size of 0. Originally we added 1 to the total_size.
> That would make our read_capacity return size 0 for >2TB lv's. We assumed that we
> could not have a lv size of 0 so it seemed OK until we were in a clustered system. The
> backup node would see a size of 0 due to the reservation on the drive. That caused
> the driver to switch to 16-byte CDB's which are not supported on older controllers.
> After that everything was broken.
> It may seem petty but I don't see the value in trying to determine if the LBA is
> beyond the 2TB boundary. That's why when we switch we use 16-byte CDB's for all
> read/write operations.
> Please consider this for inclusion.
> 
> ...
>
> +  	if (total_size == 0xFFFFFFFF) {

I seem to remember having already questioned this.  total_size is sector_t, which
can be either 32-bit or 64-bit.  Are you sure that comparison works as
intended in both cases?


> +		if(total_size == 0xFFFFFFFF) {
>  			cciss_read_capacity_16(cntl_num, i, 0,
>  			&total_size, &block_size);
>  			hba[cntl_num]->cciss_read = CCISS_READ_16;

Here too.

  reply	other threads:[~2007-02-22  3:17 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-21 21:10 Mike Miller (OS Dev)
2007-02-22  3:14 ` Andrew Morton [this message]
2007-02-22  7:31   ` [PATCH] Speedup divides by cpu_power in scheduler Eric Dumazet
2007-02-22  7:56     ` Ingo Molnar
2007-02-22  8:19     ` [PATCH, take 2] " Eric Dumazet
2007-02-22  8:19       ` Ingo Molnar
2007-02-22 16:51   ` [Patch 1/2] cciss: fix for 2TB support Mike Miller (OS Dev)
2007-02-22 21:24     ` Andrew Morton
2007-02-22 21:41       ` James Bottomley
2007-02-22 22:02         ` Mike Miller (OS Dev)
2007-02-22 22:06           ` James Bottomley
2007-02-23 20:52             ` Mike Miller (OS Dev)
2007-02-24  6:35               ` Andrew Morton
2007-02-22 20:18   ` Mike Miller (OS Dev)
2007-02-22 21:22     ` Miller, Mike (OS Dev)

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