linux-kernel - Re: [PATCH] vfs: introduce FS_IOC

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Message-Id: <201008092055.07248.arnd@arndb.de>
Date:	Mon, 9 Aug 2010 20:55:07 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Sage Weil <sage@...dream.net>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] vfs: introduce FS_IOC_SYNCFS to sync a single super

On Monday 09 August 2010, Sage Weil wrote:
> Currently the only way to sync a single super_block (and not all of them 
> via sync(2)) is via the BLKFLSBUF ioctl on the block device.  That also 
> invalidates the bdev mapping, which isn't usually desireable, and it 
> doesn't work for non-block file systems.  The ability to sync a single 
> mount can be useful for both applications and administrators (e.g., when 
> other mounts on the system are hung).

You need to add this to the compat_ioctl handling as well, otherwise
it won't work when you run a 32 bit process in a 64 bit kernel.

Adding it to the ioctl_pointer[] array is probably the easiest way.

	Arnd 
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