From: Jan Kara <jack@suse.cz>
To: ocfs2-devel@oss.oracle.com
Subject: [Ocfs2-devel] [PATCH 2/7] ocfs2: Do not map blocks from local quota file on each write
Date: Fri, 14 May 2010 10:06:58 +0200 [thread overview]
Message-ID: <20100514080658.GA3488@quack.suse.cz> (raw)
In-Reply-To: <20100513234453.GD13692@mail.oracle.com>
On Thu 13-05-10 16:44:53, Joel Becker wrote:
> On Thu, May 13, 2010 at 09:57:58PM +0200, Jan Kara wrote:
> > There is no need to map offset of local dquot structure to on disk block
> > in each quota write. It is enough to map it just once and store the physical
> > block number in quota structure in memory. Moreover this simplifies locking
> > as we do not have to take ip_alloc_sem from quota write path.
> >
> > Signed-off-by: Jan Kara <jack@suse.cz>
> Am I correct that quota files cannot be shrunk in a running
> filesystem?
Yes, quota files are only grown when the filesystem is mounted. Shrinking
is done only by fsck.ocfs2.
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2010-05-14 8:06 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-13 19:57 [Ocfs2-devel] Quota locking fixes for OCFS2 Jan Kara
2010-05-13 19:57 ` [Ocfs2-devel] [PATCH 1/7] quota: Refactor dquot_transfer code so that OCFS2 can pass in its references Jan Kara
2010-05-13 23:44 ` Joel Becker
2010-05-13 19:57 ` [Ocfs2-devel] [PATCH 2/7] ocfs2: Do not map blocks from local quota file on each write Jan Kara
2010-05-13 23:44 ` Joel Becker
2010-05-14 8:06 ` Jan Kara [this message]
2010-05-13 19:57 ` [Ocfs2-devel] [PATCH 3/7] ocfs2: Avoid unnecessary block mapping when refreshing quota info Jan Kara
2010-05-13 19:58 ` [Ocfs2-devel] [PATCH 4/7] ocfs2: Fix quota locking Jan Kara
2010-05-13 19:58 ` [Ocfs2-devel] [PATCH 5/7] ocfs2: Fix estimate of credits needed for quota allocation Jan Kara
2010-05-13 19:58 ` [Ocfs2-devel] [PATCH 6/7] ocfs2: Fix NULL pointer deref when writing local dquot Jan Kara
2010-05-13 19:58 ` [Ocfs2-devel] [PATCH 7/7] ocfs2: Use __dquot_transfer to avoid lock inversion Jan Kara
2010-05-13 23:51 ` [Ocfs2-devel] Quota locking fixes for OCFS2 Joel Becker
2010-05-14 8:08 ` Jan Kara
2010-05-14 19:36 ` Joel Becker
2010-05-17 16:18 ` Jan Kara
2010-05-17 19:17 ` Joel Becker
2010-05-17 21:30 ` Jan Kara
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