linux-kernel - Re: [PATCH v3] introduce sys_syncfs to sync a single file system

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Message-Id: <201103102308.23006.arnd@arndb.de>
Date:	Thu, 10 Mar 2011 23:08:22 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Sage Weil <sage@...dream.net>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Jonathan Nieder <jrnieder@...il.com>,
	akpm@...ux-foundation.org, linux-api@...r.kernel.org,
	mtk.manpages@...il.com, viro@...iv.linux.org.uk, hch@....de,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH v3] introduce sys_syncfs to sync a single file system

On Thursday 10 March 2011 20:31:30 Sage Weil wrote:
> It is frequently useful to sync a single file system, instead of all
> mounted file systems via sync(2):
> 
>  - On machines with many mounts, it is not at all uncommon for some of
>    them to hang (e.g. unresponsive NFS server).  sync(2) will get stuck on
>    those and may never get to the one you do care about (e.g., /).
>  - Some applications write lots of data to the file system and then
>    want to make sure it is flushed to disk.  Calling fsync(2) on each
>    file introduces unnecessary ordering constraints that result in a large
>    amount of sub-optimal writeback/flush/commit behavior by the file
>    system.
> 
> ...
> Signed-off-by: Sage Weil <sage@...dream.net>

Reviewed-by: Arnd Bergmann <arnd@...db.de>
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