From: Arnd Bergmann <arnd@arndb.de>
To: Sage Weil <sage@newdream.net>
Subject: Re: [PATCH] vfs: introduce FS_IOC_SYNCFS to sync a single super
Date: Mon, 9 Aug 2010 20:55:07 +0200
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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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