[XFS] Introduce per-filesystem delwri pagebuf flushing to reduce
contention between filesystems and prevent deadlocks between filesystems
when a flush dependency exists between them.
SGI-PV: 947098
SGI-Modid: xfs-linux-melb:xfs-kern:24844a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index 237a35b..f721d47 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -88,6 +88,15 @@
uint bt_hashmask;
uint bt_hashshift;
xfs_bufhash_t *bt_hash;
+
+ /* per device delwri queue */
+ struct task_struct *bt_task;
+ struct list_head bt_list;
+ struct list_head bt_delwrite_queue;
+ spinlock_t bt_delwrite_lock;
+ uint bt_flags;
+#define BT_FORCE_SLEEP 1
+#define BT_FORCE_FLUSH 2
} xfs_buftarg_t;
/*