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From: Miklos Szeredi <miklos@szeredi.hu>
To: Fengnan Chang <changfengnan@vivo.com>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v2] fuse: use newer inode info when writeback cache is enabled
Date: Tue, 22 Jun 2021 09:59:46 +0200	[thread overview]
Message-ID: <CAJfpegutK2HGYUtJOjvceULf2H=hoekNxUbcg=6Su6uteVmDLg@mail.gmail.com> (raw)
In-Reply-To: <20210130085003.1392-1-changfengnan@vivo.com>

On Sat, 30 Jan 2021 at 09:50, Fengnan Chang <changfengnan@vivo.com> wrote:
>
> When writeback cache is enabled, the inode information in cached is
> considered new by default, and the inode information of lowerfs is
> stale.
> When a lower fs is mount in a different directory through different
> connection, for example PATHA and PATHB, since writeback cache is
> enabled by default, when the file is modified through PATHA, viewing the
> same file from the PATHB, PATHB will think that cached inode is newer
> than lowerfs, resulting in file size and time from under PATHA and PATHB
> is inconsistent.
> Add a judgment condition to check whether to use the info in the cache
> according to mtime.

This seems to break the fsx-linux stress test.

I suspect a better direction would be looking at whether the inode has
any files open for write (i_writecount > 0)...

Thanks,
Miklos

  parent reply	other threads:[~2021-06-22  8:00 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-30  8:50 Fengnan Chang
2021-05-07 10:04 ` Fengnan Chang
2021-06-22  7:59 ` Miklos Szeredi [this message]
2021-06-22 12:25   ` Fengnan Chang
2021-06-22 15:19     ` Miklos Szeredi
2021-06-24  7:42       ` Fengnan Chang
2021-06-25  3:42         ` Fengnan Chang
2021-08-06 12:20         ` Miklos Szeredi
2021-08-10  1:41           ` Fengnan Chang
2021-08-16  2:48             ` Peng Tao
2021-05-07 10:09 changfengnan
2021-05-11 11:21 ` 答复: " changfengnan
2021-05-12 12:33   ` Miklos Szeredi
2021-06-08 11:20     ` 答复: " changfengnan

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