From: Karel Zak <kzak@redhat.com>
To: Phillip Susi <psusi@cfl.rr.com>
Cc: linux-kernel@vger.kernel.org, Vivek Goyal <vgoyal@redhat.com>,
Jens Axboe <jaxboe@fusionio.com>
Subject: Re: [PATCH 1/2] Add partition resize function to BLKPG ioctl
Date: Thu, 8 Dec 2011 16:16:50 +0100 [thread overview]
Message-ID: <20111208151650.GB16934@nb.redhat.com> (raw)
In-Reply-To: <4EE0C814.2000807@cfl.rr.com>
On Thu, Dec 08, 2011 at 09:22:12AM -0500, Phillip Susi wrote:
> On 12/8/2011 7:30 AM, Karel Zak wrote:
>> It seems very close to Vivek's BLKPG_EXTEND_PARTITION idea, see:
>>
>> https://lkml.org/lkml/2011/9/1/351
>>
>> It's evident that we (userspace) need something better than
>> BLKPG_{ADD,DEL}_* and BLKRRPART, but no response from kernel side :-(
>
> Yes, this looks very similar to mine, except that I also wanted to allow
> shrinking the partition, not just extending, since btrfs can handle this
> ( tested ).
Is it safe to alter the partition size in arbitrary way if the
partition is used by any process?
Vivek's BLKPG_EXTEND_PARTITIONV seems more safety, because it extends
a partition size only, so all offsets in all running stuff are still
valid.
Maybe you need to check bdevp->bd_openers and returns -EBUSY if you
want to alter the begin of the partition.
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
next prev parent reply other threads:[~2011-12-08 15:16 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1322709471.git.psusi@cfl.rr.com>
2011-12-01 3:23 ` [PATCH 1/2] Add partition resize function to BLKPG ioctl Phillip Susi
2011-12-08 12:30 ` Karel Zak
2011-12-08 14:22 ` Phillip Susi
2011-12-08 15:16 ` Karel Zak [this message]
2011-12-08 15:25 ` Phillip Susi
2011-12-08 15:58 ` Vivek Goyal
2011-12-08 16:06 ` Phillip Susi
2011-12-08 16:28 ` Vivek Goyal
2011-12-08 16:55 ` Phillip Susi
2011-12-09 2:53 ` Phillip Susi
2011-12-12 14:53 ` Vivek Goyal
2011-12-12 17:43 ` Phillip Susi
2011-12-12 17:49 ` Joe Perches
2011-12-12 18:04 ` Vivek Goyal
2011-12-13 0:15 ` Phillip Susi
2011-12-13 0:16 ` Phillip Susi
2011-12-13 0:16 ` [PATCH 2/2] Add BLKPG_GET_PARTITION operation Phillip Susi
2011-12-19 20:25 ` [PATCH 1/2] Add partition resize function to BLKPG ioctl Vivek Goyal
2011-12-21 1:53 ` Phillip Susi
2011-12-21 1:54 ` Phillip Susi
2011-12-21 1:54 ` [PATCH 2/2] Add BLKPG_GET_PARTITION operation Phillip Susi
2011-12-21 20:46 ` [PATCH 1/2] Add partition resize function to BLKPG ioctl Vivek Goyal
2011-12-24 21:36 ` Phillip Susi
2011-12-24 22:21 ` Phillip Susi
2011-12-24 22:21 ` [PATCH 2/2] Add BLKPG_GET_PARTITION operation Phillip Susi
2011-12-01 3:23 ` Phillip Susi
2011-12-08 12:35 ` Karel Zak
2011-12-08 14:25 ` Phillip Susi
2011-12-29 17:06 [PATCH 1/2] Add partition resize function to BLKPG ioctl Maxim Patlasov
2011-12-30 0:09 ` Phillip Susi
2012-01-01 21:49 ` Phillip Susi
2012-01-26 19:01 ` Vivek Goyal
2012-01-26 20:35 ` Phillip Susi
2012-01-26 21:04 ` Vivek Goyal
2012-01-26 21:48 ` Phillip Susi
2012-01-30 15:49 ` Vivek Goyal
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