linux-kernel - Re: [PATCH] loop: cleanup partitions when detaching loop device

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Message-ID: <51427D57.7080702@ubuntu.com>
Date:	Thu, 14 Mar 2013 21:45:59 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] loop: cleanup partitions when detaching loop device

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On 03/14/2013 06:07 PM, Andrew Morton wrote:
> huh.  What is the user-visible effect of this bug?  Just a memory
> leak or something more serious?

Not serious, but user-visible in that the partition devnodes still
show up after detaching the backing file, and I think the partitions
remained in place after attaching a new file even though it had
different or no partitions at all.

> scripts/checkpatch.pl is your friend.

Oops.  I see you pushed a patch fixing up the brace position and
breaking the long line.  Did you want me to squash it and resubmit, or
just sign off on it?  If the latter, consider it signed off.

> Can you please suggest a code comment which we can slip in here to
> tell readers what's going on and why we're doing this?

How about "Remove all partitions, since BLKRRPART won't remove user
added partitions when max_part=0"?

>> +		struct disk_part_iter piter; +		struct hd_struct *part; + +
>> mutex_lock_nested(&bdev->bd_mutex, 1); +
>> invalidate_partition(bdev->bd_disk, 0); +
>> disk_part_iter_init(&piter, bdev->bd_disk,
>> DISK_PITER_INCL_EMPTY); +		while ((part =
>> disk_part_iter_next(&piter))) +			delete_partition(bdev->bd_disk,
>> part->partno); +		disk_part_iter_exit(&piter); +
>> mutex_unlock(&bdev->bd_mutex); +	}
> 

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