linux-kernel - Re: [PATCH 1/2] block: add partition resize function to blkpg ioctl

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Message-ID: <4F831103.3050704@parallels.com>
Date:	Mon, 9 Apr 2012 20:40:35 +0400
From:	"Maxim V. Patlasov" <mpatlasov@...allels.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"kzak@...hat.com" <kzak@...hat.com>,
	"psusi@...ntu.com" <psusi@...ntu.com>,
	"psusi@....rr.com" <psusi@....rr.com>,
	"maxim.patlasov@...il.com" <maxim.patlasov@...il.com>
Subject: Re: [PATCH 1/2] block: add partition resize function to blkpg ioctl

Hi Vivek,

See please inline comments below...

On 02/15/2012 12:39 AM, Vivek Goyal wrote:
> ...
> @@ -765,8 +765,8 @@ void __init printk_all_partitions(void)
>
>   			printk("%s%s %10llu %s %s", is_part0 ? "" : "  ",
>   			       bdevt_str(part_devt(part), devt_buf),
> -			       (unsigned long long)part->nr_sects>>  1,
> -			       disk_name(disk, part->partno, name_buf), uuid);
> +			       (unsigned long long)part_nr_sects_read(part)>>  1
> +			       , disk_name(disk, part->partno, name_buf), uuid);

A line starting from comma looks unusual. Is it what you intended?

> diff --git a/block/ioctl.c b/block/ioctl.c
> index ba15b2d..ddbc649 100644
> --- a/block/ioctl.c
> +++ b/block/ioctl.c
> ...
> @@ -92,6 +92,57 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
>   			bdput(bdevp);
>
>   			return 0;
> +		case BLKPG_RESIZE_PARTITION:
> +			start = p.start>>  9;
> +			/* new length of partition in bytes */
> +			length = p.length>>  9;
> +			/* check for fit in a hd_struct */
> +			if (sizeof(sector_t) == sizeof(long)&&
> +			    sizeof(long long)>  sizeof(long)) {
> +				long pstart = start, plength = length;
> +				if (pstart != start || plength != length
> +				    || pstart<  0 || plength<  0)
> +					return -EINVAL;
> +			}
> +			part = disk_get_part(disk, partno);
> +			if (!part)
> +				return -ENXIO;
> +			bdevp = bdget(part_devt(part));
> +			if (!bdevp) {
> +				disk_put_part(part);
> +				return -ENOMEM;
> +			}
> +			mutex_lock(&bdevp->bd_mutex);
> +			mutex_lock_nested(&bdev->bd_mutex, 1);
> +			if (start != part->start_sect) {
> +				mutex_unlock(&bdevp->bd_mutex);
> +				mutex_unlock(&bdev->bd_mutex);
> +				disk_put_part(part);
> +				return -EINVAL;

bdput(bdevp) missed?


> +			}
> +			/* overlap? */
> +			disk_part_iter_init(&piter, disk,
> +					    DISK_PITER_INCL_EMPTY);
> +			while ((lpart = disk_part_iter_next(&piter))) {
> +				if (lpart->partno != partno&&
> +				   !(start + length<= lpart->start_sect ||
> +				   start>= lpart->start_sect + lpart->nr_sects)
> +				   ) {
> +					disk_part_iter_exit(&piter);
> +					mutex_unlock(&bdevp->bd_mutex);
> +					mutex_unlock(&bdev->bd_mutex);
> +					disk_put_part(part);
> +					return -EBUSY;

bdput(bdevp) missed?

> +				}
> +			}
> +			disk_part_iter_exit(&piter);
> +			part_nr_sects_write(part, (sector_t)length);
> +			i_size_write(bdevp->bd_inode, p.length);
> +			mutex_unlock(&bdevp->bd_mutex);
> +			mutex_unlock(&bdev->bd_mutex);
> +			bdput(bdevp);
> +			disk_put_part(part);
> +			return 0;
>   		default:
>   			return -EINVAL;
>   	}

Thanks,
Maxim
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