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From: Tetsuhiro Kohada <kohada.t2@gmail.com>
To: Sungjong Seo <sj1557.seo@samsung.com>
Cc: kohada.tetsuhiro@dc.mitsubishielectric.co.jp,
	mori.takahiro@ab.mitsubishielectric.co.jp,
	motai.hirotaka@aj.mitsubishielectric.co.jp,
	'Namjae Jeon' <namjae.jeon@samsung.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] exfat: remove EXFAT_SB_DIRTY flag
Date: Thu, 18 Jun 2020 17:36:34 +0900	[thread overview]
Message-ID: <aac9d6c7-1d62-a85d-9bcb-d3c0ddc8fcd6@gmail.com> (raw)
In-Reply-To: <414101d64477$ccb661f0$662325d0$@samsung.com>

Thank you for your comment.

On 2020/06/17 16:20, Sungjong Seo wrote:
>> remove EXFAT_SB_DIRTY flag and related codes.
>>
>> This flag is set/reset in exfat_put_super()/exfat_sync_fs() to avoid
>> sync_blockdev().
>> However ...
>> - exfat_put_super():
>> Before calling this, the VFS has already called sync_filesystem(), so sync
>> is never performed here.
>> - exfat_sync_fs():
>> After calling this, the VFS calls sync_blockdev(), so, it is meaningless
>> to check EXFAT_SB_DIRTY or to bypass sync_blockdev() here.
>> Not only that, but in some cases can't clear VOL_DIRTY.
>> ex:
>> VOL_DIRTY is set when rmdir starts, but when non-empty-dir is detected,
>> return error without setting EXFAT_SB_DIRTY.
>> If performe 'sync' in this state, VOL_DIRTY will not be cleared.
>>
> 
> Since this patch does not resolve 'VOL_DIRTY in ENOTEMPTY' problem you
> mentioned,
> it would be better to remove the description above for that and to make new
> patch.

I mentioned rmdir as an example.
However, this problem is not only with rmdirs.
VOL_DIRTY remains when some functions abort with an error.
In original, VOL_DIRTY is not cleared even if performe 'sync'.
With this patch, it ensures that VOL_DIRTY will be cleared by 'sync'.

Is my description insufficient?


BTW
Even with this patch applied,  VOL_DIRTY remains until synced in the above case.
It's not  easy to reproduce as rmdir, but I'll try to fix it in the future.


BR
---
Tetsuhiro Kohada <kohada.t2@gmail.com>




  parent reply	other threads:[~2020-06-18  8:36 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200616021816epcas1p44b0833f14bbad0e25cc0efb27fb2ebd3@epcas1p4.samsung.com>
2020-06-16  2:18 ` Tetsuhiro Kohada
2020-06-16 23:55   ` Namjae Jeon
2020-06-17  7:20   ` Sungjong Seo
2020-06-17  8:41     ` Namjae Jeon
2020-06-18  8:36     ` Tetsuhiro Kohada [this message]
2020-06-18 13:11       ` Sungjong Seo
2020-06-19  4:22         ` Tetsuhiro Kohada
2020-07-10  7:36         ` Tetsuhiro Kohada
2020-08-08 17:47           ` Sungjong Seo
2020-08-12  9:19             ` Tetsuhiro Kohada
2020-08-13  4:03               ` Namjae Jeon
2020-08-18  1:20                 ` Tetsuhiro Kohada
2020-06-16  6:16 Markus Elfring
2020-06-16 14:45 ` Matthew Wilcox

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