From: Jan Kara <jack@suse.cz>
To: "Theodore Y. Ts'o" <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>,
linux-ext4@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH 04/22] ext4: Fix credit estimate for final inode freeing
Date: Thu, 24 Oct 2019 12:30:38 +0200 [thread overview]
Message-ID: <20191024103038.GN31271@quack2.suse.cz> (raw)
In-Reply-To: <20191021010723.GB6799@mit.edu>
On Sun 20-10-19 21:07:23, Theodore Y. Ts'o wrote:
> On Fri, Oct 04, 2019 at 12:05:50AM +0200, Jan Kara wrote:
> > Estimate for the number of credits needed for final freeing of inode in
> > ext4_evict_inode() was to small. We may modify 4 blocks (inode & sb for
> > orphan deletion, bitmap & group descriptor for inode freeing) and not
> > just 3.
>
> The modification for the inode should already be included in the
> calculation for ext4_blocks_for_truncate(), no? So we only need 3
> extra blocks (sb, inode bitmap, and bg descriptor for the inode).
Yes, but 'extra_credits' is also passed to ext4_xattr_delete_inode() and if
that needs to restart a transaction, it needs to reserve enough for inode
modification in that new transaction. This patch is actually a result of
assertion checks I was getting with more accurate transaction restart
handling implemented later in this series...
I agree we can actually subtract 3 from
ext4_blocks_for_truncate(inode)+extra_credits when starting the initial
transaction as inode changes get double-accounted there. I can do that
and I'll also update the changelog to explain this better.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2019-10-24 10:30 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191003215523.7313-1-jack@suse.cz>
2019-10-03 22:05 ` [PATCH 01/22] jbd2: Fix possible overflow in jbd2_log_space_left() Jan Kara
2019-10-21 1:08 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 03/22] ext4: Do not iput inode under running transaction in ext4_mkdir() Jan Kara
2019-10-21 1:21 ` Theodore Y. Ts'o
2019-10-24 10:19 ` Jan Kara
2019-10-24 12:09 ` Theodore Y. Ts'o
2019-10-24 13:37 ` Jan Kara
2019-11-04 12:35 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 04/22] ext4: Fix credit estimate for final inode freeing Jan Kara
2019-10-21 1:07 ` Theodore Y. Ts'o
2019-10-24 10:30 ` Jan Kara [this message]
2019-11-05 16:44 ` [PATCH 01/25] jbd2: Fix possible overflow in jbd2_log_space_left() Jan Kara
2019-11-05 16:44 ` [PATCH 05/25] ext4: Do not iput inode under running transaction Jan Kara
2019-11-05 16:44 ` [PATCH 06/25] ext4: Fix credit estimate for final inode freeing Jan Kara
2019-11-05 21:00 ` Theodore Y. Ts'o
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