xfs: remove the per-filesystem list of dquots

Instead of keeping a separate per-filesystem list of dquots we can walk
the radix tree for the two places where we need to iterate all quota
structures.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index 8f4b117..7644706 100644
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h
@@ -63,11 +63,7 @@
 	struct list_head qi_lru_list;
 	struct mutex	 qi_lru_lock;
 	int		 qi_lru_count;
-	struct list_head qi_dqlist;	 /* all dquots in filesys */
-	struct mutex	 qi_dqlist_lock;
 	int		 qi_dquots;
-	int		 qi_dqreclaims;	 /* a change here indicates
-					    a removal in the dqlist */
 	time_t		 qi_btimelimit;	 /* limit for blks timer */
 	time_t		 qi_itimelimit;	 /* limit for inodes timer */
 	time_t		 qi_rtbtimelimit;/* limit for rt blks timer */
@@ -126,7 +122,7 @@
 extern int		xfs_qm_write_sb_changes(xfs_mount_t *, __int64_t);
 
 /* dquot stuff */
-extern int		xfs_qm_dqpurge_all(xfs_mount_t *, uint);
+extern void		xfs_qm_dqpurge_all(xfs_mount_t *, uint);
 extern void		xfs_qm_dqrele_all_inodes(xfs_mount_t *, uint);
 
 /* quota ops */