GFS2: Use generic list_lru for quota
By using the generic list_lru code, we can now separate the
per sb quota list locking from the lru locking. The lru
lock is made into the inner-most lock.
As a result of this new lock order, we may occasionally see
items on the per-sb quota list which are "dead" so that the
two places where we traverse that list are updated to take
account of that.
As a result of this patch, the gfs2 quota shrinker is now
NUMA zone aware, and we are also laying the foundations for
further improvments in due course.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Abhijith Das <adas@redhat.com>
Tested-by: Abhijith Das <adas@redhat.com>
Cc: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 351586e..0650db2 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -31,12 +31,6 @@
struct workqueue_struct *gfs2_control_wq;
-static struct shrinker qd_shrinker = {
- .count_objects = gfs2_qd_shrink_count,
- .scan_objects = gfs2_qd_shrink_scan,
- .seeks = DEFAULT_SEEKS,
-};
-
static void gfs2_init_inode_once(void *foo)
{
struct gfs2_inode *ip = foo;
@@ -87,6 +81,10 @@
if (error)
return error;
+ error = list_lru_init(&gfs2_qd_lru);
+ if (error)
+ goto fail_lru;
+
error = gfs2_glock_init();
if (error)
goto fail;
@@ -139,7 +137,7 @@
if (!gfs2_rsrv_cachep)
goto fail;
- register_shrinker(&qd_shrinker);
+ register_shrinker(&gfs2_qd_shrinker);
error = register_filesystem(&gfs2_fs_type);
if (error)
@@ -179,7 +177,9 @@
fail_unregister:
unregister_filesystem(&gfs2_fs_type);
fail:
- unregister_shrinker(&qd_shrinker);
+ list_lru_destroy(&gfs2_qd_lru);
+fail_lru:
+ unregister_shrinker(&gfs2_qd_shrinker);
gfs2_glock_exit();
if (gfs2_rsrv_cachep)
@@ -214,13 +214,14 @@
static void __exit exit_gfs2_fs(void)
{
- unregister_shrinker(&qd_shrinker);
+ unregister_shrinker(&gfs2_qd_shrinker);
gfs2_glock_exit();
gfs2_unregister_debugfs();
unregister_filesystem(&gfs2_fs_type);
unregister_filesystem(&gfs2meta_fs_type);
destroy_workqueue(gfs_recovery_wq);
destroy_workqueue(gfs2_control_wq);
+ list_lru_destroy(&gfs2_qd_lru);
rcu_barrier();