[PATCH] Clean up dquot pincount code.

[Peter Leckie <pleckie@sgi.com>]

Sorry people the take message got lost so I reposted it, however the 
subject line was dropped.

Pete

Peter Leckie wrote:
> mod xfs-linux-melb:xfs-kern:32215a TAKE message
> ================================================
> Subject: TAKE 986789 - 
>
> Clean up dquot pincount code.
>
> This is a code cleanup and optimization that removes a per mount point
> spinlock from the quota code and cleans up the code.
>
> The patch changes the pincount from being an int protected by a spinlock
> to an atomic_t allowing the pincount to be manipulated without holding
> the spinlock.
>
> This cleanup also protects against random wakup's of both the aild and
> xfssyncd by reevaluating the pincount after been woken. Two latter patches
> will address the Spurious wakeups.
>
> Signed-off-by: Peter Leckie <pleckie@sgi.com>
>
> Date:  Fri Sep 26 14:42:30 AEST 2008
> Workarea:  chook.melbourne.sgi.com:/build/pleckie/2.6.x-xfs
> Inspected by:  
> donaldd
> lachlan
> hch@lst.de
> david@fromorbit.com
> Author:  pleckie
>
> The following file(s) were checked into:
>   longdrop.melbourne.sgi.com:/isms/linux/2.6.x-xfs-melb
>
>
> Modid:  xfs-linux-melb:xfs-kern:32215a
> fs/xfs/xfsidbg.c - 1.367 - changed
> fs/xfs/quota/xfs_dquot_item.c - 1.24 - changed
> fs/xfs/quota/xfs_dquot.h - 1.14 - changed
> fs/xfs/quota/xfs_dquot.c - 1.39 - changed
> fs/xfs/quota/xfs_qm.h - 1.21 - changed
> fs/xfs/quota/xfs_qm.c - 1.75 - changed
> 	- Clean up dquot pincount code.
>
>
>
>
>
>