linux-kernel - Re: [PATCH RFC 00/17] ubifs: Add filesystem repair support

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Message-ID: <391060208.195010.1704288780905.JavaMail.zimbra@nod.at>
Date: Wed, 3 Jan 2024 14:33:00 +0100 (CET)
From: Richard Weinberger <richard@....at>
To: chengzhihao1 <chengzhihao1@...wei.com>
Cc: david oberhollenzer <david.oberhollenzer@...ma-star.at>, 
	Miquel Raynal <miquel.raynal@...tlin.com>, 
	Sascha Hauer <s.hauer@...gutronix.de>, 
	Tudor Ambarus <Tudor.Ambarus@...aro.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	linux-mtd <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH RFC 00/17] ubifs: Add filesystem repair support

----- Ursprüngliche Mail -----
> Von: "chengzhihao1" <chengzhihao1@...wei.com>
>> 2. Journal replay is also needed after a clean umount. The reason is that
>> UBIFS does no commit at umount time.
> 
> I agree, there exists one situation that UBIFS replays journal even
> after clean umount.
>     P1      ubifs_bgt      umount
>   mkdir
>          run_bg_commit
>           c->cmt_state = COMMIT_RUNNING_BACKGROUND
>           do_commit
>            ubifs_log_start_commit(c, &new_ltail_lnum) // log start
>            up_write(&c->commit_sem)
>   touch
>    ubifs_jnl_update // new buds added
>                          cleanup_mnt
>                           deactivate_super
>                            fs->kill_sb
>                             generic_shutdown_super
>                              sync_filesystem
>                               ubifs_sync_fs
>                                ubifs_run_commit
>                                 wait_for_commit // wait bg commit,
> 'touch' won't be commited, it will be replayed in next mount

BTW: I was imprecise, sorry for that.
The issue is that even after a commit you need to replay the journal.

Thanks,
//richard