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From: "J. Bruce Fields" <bfields@fieldses.org>
To: Rogier Wolff <R.E.Wolff@BitWizard.nl>
Cc: "Jeff Layton" <jlayton@redhat.com>, 焦晓冬 <milestonejxd@gmail.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: POSIX violation by writeback error
Date: Tue, 4 Sep 2018 14:54:11 -0400	[thread overview]
Message-ID: <20180904185411.GA22166@fieldses.org> (raw)
In-Reply-To: <20180904162348.GN17123@BitWizard.nl>

On Tue, Sep 04, 2018 at 06:23:48PM +0200, Rogier Wolff wrote:
> On Tue, Sep 04, 2018 at 12:12:03PM -0400, J. Bruce Fields wrote:
> > Well, I think the point was that in the above examples you'd prefer that
> > the read just fail--no need to keep the data.  A bit marking the file
> > (or even the entire filesystem) unreadable would satisfy posix, I guess.
> > Whether that's practical, I don't know.
> 
> When you would do it like that (mark the whole filesystem as "in
> error") things go from bad to worse even faster. The Linux kernel 
> tries to keep the system up even in the face of errors. 
> 
> With that suggestion, having one application run into a writeback
> error would effectively crash the whole system because the filesystem
> may be the root filesystem and stuff like "sshd" that you need to
> diagnose the problem needs to be read from the disk.... 

Well, the absolutist position on posix compliance here would be that a
crash is still preferable to returning the wrong data.  And for the
cases 焦晓冬 gives, that sounds right?  Maybe it's the wrong balance in
general, I don't know.  And we do already have filesystems with
panic-on-error options, so if they aren't used maybe then maybe users
have already voted against that level of strictness.

--b.

  reply	other threads:[~2018-09-04 23:20 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-04  6:32 POSIX violation by writeback error 焦晓冬
2018-09-04  7:53 ` Rogier Wolff
2018-09-04  8:58   ` 焦晓冬
2018-09-04  9:29     ` Rogier Wolff
2018-09-04 10:45       ` 焦晓冬
2018-09-04 11:09     ` Jeff Layton
2018-09-04 14:56       ` 焦晓冬
2018-09-04 15:44         ` Jeff Layton
2018-09-04 16:12           ` J. Bruce Fields
2018-09-04 16:23             ` Rogier Wolff
2018-09-04 18:54               ` J. Bruce Fields [this message]
2018-09-04 20:18                 ` Jeff Layton
2018-09-04 20:35                   ` Vito Caputo
2018-09-04 21:02                     ` Matthew Wilcox
2018-09-05  0:51                     ` Dave Chinner
2018-09-05  8:24                   ` 焦晓冬
2018-09-05 10:55                     ` Jeff Layton
2018-09-05 12:07                       ` Rogier Wolff
2018-09-06  2:57                         ` Dave Chinner
2018-09-06  9:17                           ` Rogier Wolff
2018-09-24 23:09                             ` Alan Cox
2018-09-05 13:53                       ` J. Bruce Fields
2018-09-05  7:08           ` Rogier Wolff
2018-09-05  7:39             ` Martin Steigerwald
2018-09-05  8:04               ` Rogier Wolff
2018-09-05  8:37                 ` 焦晓冬
2018-09-05 12:07                   ` Austin S. Hemmelgarn
2018-09-05 12:46                     ` Rogier Wolff
2018-09-05  9:32                 ` Martin Steigerwald
2018-09-05  7:37           ` Martin Steigerwald
2018-09-05 11:42             ` Jeff Layton
2018-09-05  8:09           ` 焦晓冬
2018-09-05 13:08             ` Theodore Y. Ts'o
2018-09-24 23:21               ` Alan Cox
2018-09-06  7:28             ` 焦晓冬
     [not found] <CAJDTihx2yaR-_-9Ks1PoFcrKNZgUOoLdN-wRTTMV76Jg_dCLrw@mail.gmail.com>
2018-09-04 10:56 ` Jeff Layton
2018-09-24 23:30   ` Alan Cox
2018-09-25 11:15     ` Jeff Layton
2018-09-25 15:46       ` Theodore Y. Ts'o
2018-09-25 16:17         ` Rogier Wolff
2018-09-25 16:39         ` Alan Cox
2018-09-25 16:41         ` Jeff Layton
2018-09-25 22:30           ` Theodore Y. Ts'o
2018-09-26 18:10             ` Alan Cox
2018-09-26 21:49               ` Theodore Y. Ts'o
2018-09-27 22:48                 ` Alan Cox
2018-09-27  7:18               ` Rogier Wolff
2018-09-27 12:43             ` Jeff Layton
2018-09-27 14:27               ` Theodore Y. Ts'o
2018-09-25 17:35         ` Adam Borowski
2018-09-25 22:46           ` Theodore Y. Ts'o

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