linux-ext4 - Re: [PATCH v2] jbd2: preserve original nofs flag during journal restart

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170518093939.GD9084@quack2.suse.cz>
Date:   Thu, 18 May 2017 11:39:39 +0200
From:   Jan Kara <jack@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Tahsin Erdogan <tahsin@...gle.com>, Theodore Ts'o <tytso@....edu>,
        Jan Kara <jack@...e.com>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] jbd2: preserve original nofs flag during journal
 restart

On Thu 18-05-17 11:12:53, Michal Hocko wrote:
> On Wed 17-05-17 09:16:29, Tahsin Erdogan wrote:
> [...]
> > diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
> > index 9ee4832b6f8b..05c0323493fb 100644
> > --- a/fs/jbd2/transaction.c
> > +++ b/fs/jbd2/transaction.c
> > @@ -680,6 +680,8 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, gfp_t gfp_mask)
> > 
> >  	rwsem_release(&journal->j_trans_commit_map, 1, _THIS_IP_);
> >  	handle->h_buffer_credits = nblocks;
> > +	/* Restore original nofs flag as jbd2_journal_stop() would do. */
> 
> I was thinking something more specific like
> 	/*
> 	 * Restore the original nofs context because the journal restart
> 	 * is basically the same thing as journal stop and start.
> 	 * start_this_handle will start a new nofs context.
> 	 */

Yeah, this is much better. Tahsin, please use Michal's version. Thanks!

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR