From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Junfeng Yang <yjf@stanford.edu>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
mc@cs.stanford.edu
Subject: Re: [CHECKER] Does sys_sync (ext2, 2.6.x) flush metadata?
Date: Fri, 11 Feb 2005 14:17:49 +0100 [thread overview]
Message-ID: <58cb370e050211051752d0342c@mail.gmail.com> (raw)
In-Reply-To: <Pine.GSO.4.44.0502102345540.8091-100000@elaine24.Stanford.EDU>
Hi,
On Thu, 10 Feb 2005 23:59:53 -0800 (PST), Junfeng Yang <yjf@stanford.edu> wrote:
>
> Hi,
>
> We're working on a file system checker and have a question regarding what
> sys_sync actually does. It appears to us that sys_sync should sync both
> data and metadata, and wait until both data and metadata hit the disk
> before it returns. Is this true for all the file systems (especially
> ext2) for kernel 2.6.x? I've gotten many "error" traces for ext2, where
> directory entries are not flushed to disk after sys_sync. In other words,
> even if users do call sys_sync, a crash after sys_sync call can still
> cause file losses. Is this intended?
I don't know what exactly you are doing but do you remember
about disabling write caching on your disks in case of doing
real hard crashes?
Regards,
Bartlomiej
prev parent reply other threads:[~2005-02-11 13:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-11 7:59 [CHECKER] Does sys_sync (ext2, 2.6.x) flush metadata? Junfeng Yang
2005-02-11 10:14 ` Andrew Morton
2005-02-11 12:44 ` Andi Kleen
2005-02-11 13:17 ` Bartlomiej Zolnierkiewicz [this message]
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