linux-kernel - Re: [PATCH] ubifs: Add freeze support

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Message-ID: <8e61baf3-a78e-d17f-ebe2-cd56d6c52259@nod.at>
Date:   Mon, 29 May 2017 10:42:37 +0200
From:   Richard Weinberger <richard@....at>
To:     Hyunchul Lee <hyc.lee@...il.com>
Cc:     Artem Bityutskiy <dedekind1@...il.com>, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        linux-mtd@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] ubifs: Add freeze support

Hyunchul,

Am 29.05.2017 um 04:24 schrieb Hyunchul Lee:
>>> This is just broken.  First ubifs should still properly propagate
>>> the errors, and second freezing/unfreezing read only file systems is
>>> perfectly valid, 
>>
>> it is right.
> 
> if updating TNC is failed, ubifs might become inconsistant and be switched to 
> read-only mode. for example, when ubifs_jnl_update is called to create a file, 
> if inserting a znode for new inode is failed, TNC has only a znode for 
> new dentry. and this can be only recoverd by replay.
> 
> is it required to fix this?

UBIFS is designed to be power-cut tolerant.
So, UBIFS must not corrupt in any case.

Which failure are you facing?

I have the feeling that you try to paper over some other issue. :-)

Thanks,
//richard