linux-kernel - Re: [PATCH 8/9] mtip32xx: abort secure erase operation if the device is mounted

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Date:	Tue, 12 May 2015 11:46:30 -0400
From:	Jens Axboe <axboe@...nel.dk>
To:	Asai Thambi SP <asamymuthupa@...ron.com>
CC:	linux-kernel@...r.kernel.org, Sam Bradshaw <sbradshaw@...ron.com>,
	Selvan Mani <smani@...ron.com>
Subject: Re: [PATCH 8/9] mtip32xx: abort secure erase operation if the device
 is mounted

On 05/11/2015 06:56 PM, Asai Thambi SP wrote:
> Signed-off-by: Sam Bradshaw <sbradshaw@...ron.com>
> Signed-off-by: Asai Thambi S P <asamymuthupa@...ron.com>
> ---
>   drivers/block/mtip32xx/mtip32xx.c |   12 ++++++++++++
>   1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
> index 0b223e3..f8c12e1 100644
> --- a/drivers/block/mtip32xx/mtip32xx.c
> +++ b/drivers/block/mtip32xx/mtip32xx.c
> @@ -2147,6 +2147,18 @@ static int exec_drive_taskfile(struct driver_data *dd,
>   		fis.lba_hi,
>   		fis.device);
>
> +	/* Check for secure erase while fs mounted */
> +	if ((fis.command == ATA_CMD_SEC_ERASE_PREP) ||
> +	    (fis.command == ATA_CMD_SEC_ERASE_UNIT) ||
> +	    (fis.command == 0xFC && fis.features == 0x12)) {
> +		if (dd->bdev && dd->bdev->bd_holders > 0) {
> +			dev_warn(&dd->pdev->dev, "Drive erase aborted due to non-zero refcount (%d)\n",
> +				dd->bdev->bd_holders);
> +			err = -ERESTARTSYS;
> +			goto abort;
> +		}
> +	}

I don't like this. If you want to do something like this, why not claim 
before these commands and unclaim after? If the claim fails, fail the 
command.


-- 
Jens Axboe

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