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>
next prev 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 ` [PATCH v3] exfat: remove EXFAT_SB_DIRTY flag 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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