From: Andi Kleen <ak@muc.de>
To: Junfeng Yang <yjf@stanford.edu>
Cc: mc@cs.Stanford.EDU, linux-kernel@vger.kernel.org
Subject: Re: [CHECKER] Does sys_sync (ext2, 2.6.x) flush metadata?
Date: Fri, 11 Feb 2005 13:44:34 +0100 [thread overview]
Message-ID: <m1wttfuuz1.fsf@muc.de> (raw)
In-Reply-To: <Pine.GSO.4.44.0502102345540.8091-100000@elaine24.Stanford.EDU> (Junfeng Yang's message of "Thu, 10 Feb 2005 23:59:53 -0800 (PST)")
Junfeng Yang <yjf@stanford.edu> writes:
> 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?
No, it would be a bug. sync() is supposed to flush everything.
In the ext2 case directory changes should be hold in a dirty buffer,
which sync should normally flush.
-Andi
next prev parent reply other threads:[~2005-02-11 12:44 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 [this message]
2005-02-11 13:17 ` Bartlomiej Zolnierkiewicz
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