From: Vivek Goyal <vgoyal@redhat.com>
To: Phillip Susi <psusi@cfl.rr.com>
Cc: joe@perches.com, kzak@redhat.com, linux-kernel@vger.kernel.org,
jaxboe@fusionio.com
Subject: Re: [PATCH 1/2] Add partition resize function to BLKPG ioctl
Date: Wed, 21 Dec 2011 15:46:41 -0500 [thread overview]
Message-ID: <20111221204641.GB27789@redhat.com> (raw)
In-Reply-To: <4EF13C30.4050307@cfl.rr.com>
On Tue, Dec 20, 2011 at 08:53:52PM -0500, Phillip Susi wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 12/19/2011 03:25 PM, Vivek Goyal wrote:
> > Are there any restrictions on order of partition bdev and disk bdev
> > locking.
>
> Good point, yes, it seems you need to take the partition first. Now that I think about it though, I don't think we need the disk mutex at all. I thought you needed to hold it in order to iterate over the partitions, but it looks like you don't since that uses an RCU, right?
>
I guess taking disk mutex will help us providing mutual exclusion between
multiple ioctls or multiple instances of same ioctl. Like, while you are
extending a partition and checking for overlap, you don't want another call
making progress on next partition which might overlap with this partition.
Thanks
Vivek
next prev parent reply other threads:[~2011-12-21 20:46 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
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 ` Vivek Goyal [this message]
2011-12-24 21:36 ` [PATCH 1/2] Add partition resize function to BLKPG ioctl 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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