Linux 3.0 compat, shrinker compatibility

To accomindate the updated Linux 3.0 shrinker API the spl
shrinker compatibility code was updated.  Unfortunately, this
couldn't be done cleanly without slightly adjusting the comapt
API.  See spl commit a55bcaad181096d764e12d847e3091cd7b15509a.

This commit updates the ZFS code to use the slightly modified
API.  You must use the latest SPL if your building ZFS.

diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index eb5304a..7f1f747 100644 (file)
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -2191,7 +2191,8 @@ arc_reclaim_thread(void)
  * direct reclaim will be trigger.  In direct reclaim a more aggressive
  * strategy is used, data is evicted from the ARC and free slabs reaped.
  */
-SPL_SHRINKER_CALLBACK_PROTO(arc_shrinker_func, cb, nr_to_scan, gfp_mask)
+static int
+__arc_shrinker_func(struct shrinker *shrink, struct shrink_control *sc)
 {
        arc_reclaim_strategy_t strategy;
        int arc_reclaim;
@@ -2199,7 +2200,7 @@ SPL_SHRINKER_CALLBACK_PROTO(arc_shrinker_func, cb, nr_to_scan, gfp_mask)
        /* Return number of reclaimable pages based on arc_shrink_shift */
        arc_reclaim = MAX(btop(((int64_t)arc_size - (int64_t)arc_c_min))
            >> arc_shrink_shift, 0);
-       if (nr_to_scan == 0)
+       if (sc->nr_to_scan == 0)
                return (arc_reclaim);
 
        /* Prevent reclaim below arc_c_min */
@@ -2207,7 +2208,7 @@ SPL_SHRINKER_CALLBACK_PROTO(arc_shrinker_func, cb, nr_to_scan, gfp_mask)
                return (-1);
 
        /* Not allowed to perform filesystem reclaim */
-       if (!(gfp_mask & __GFP_FS))
+       if (!(sc->gfp_mask & __GFP_FS))
                return (-1);
 
        /* Reclaim in progress */
@@ -2229,6 +2230,7 @@ SPL_SHRINKER_CALLBACK_PROTO(arc_shrinker_func, cb, nr_to_scan, gfp_mask)
 
        return (arc_reclaim);
 }
+SPL_SHRINKER_CALLBACK_WRAPPER(arc_shrinker_func);
 
 SPL_SHRINKER_DECLARE(arc_shrinker, arc_shrinker_func, DEFAULT_SEEKS);
 #endif /* _KERNEL */