[PATCH v4 12/48] gfs2: dynamically allocate the gfs2-qd shrinker

[Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>]

Use new APIs to dynamically allocate the gfs2-qd shrinker.

Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
---
 fs/gfs2/main.c  |  6 +++---
 fs/gfs2/quota.c | 26 ++++++++++++++++++++------
 fs/gfs2/quota.h |  3 ++-
 3 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index afcb32854f14..e47b1cc79f59 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -147,7 +147,7 @@ static int __init init_gfs2_fs(void)
        if (!gfs2_trans_cachep)
                goto fail_cachep8;
 
-       error = register_shrinker(&gfs2_qd_shrinker, "gfs2-qd");
+       error = gfs2_qd_shrinker_init();
        if (error)
                goto fail_shrinker;
 
@@ -196,7 +196,7 @@ static int __init init_gfs2_fs(void)
 fail_wq2:
        destroy_workqueue(gfs_recovery_wq);
 fail_wq1:
-       unregister_shrinker(&gfs2_qd_shrinker);
+       gfs2_qd_shrinker_exit();
 fail_shrinker:
        kmem_cache_destroy(gfs2_trans_cachep);
 fail_cachep8:
@@ -229,7 +229,7 @@ static int __init init_gfs2_fs(void)
 
 static void __exit exit_gfs2_fs(void)
 {
-       unregister_shrinker(&gfs2_qd_shrinker);
+       gfs2_qd_shrinker_exit();
        gfs2_glock_exit();
        gfs2_unregister_debugfs();
        unregister_filesystem(&gfs2_fs_type);
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 632806c5ed67..d1e4d8ab8fa1 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -186,13 +186,27 @@ static unsigned long gfs2_qd_shrink_count(struct shrinker 
*shrink,
        return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
 }
 
-struct shrinker gfs2_qd_shrinker = {
-       .count_objects = gfs2_qd_shrink_count,
-       .scan_objects = gfs2_qd_shrink_scan,
-       .seeks = DEFAULT_SEEKS,
-       .flags = SHRINKER_NUMA_AWARE,
-};
+static struct shrinker *gfs2_qd_shrinker;
+
+int __init gfs2_qd_shrinker_init(void)
+{
+       gfs2_qd_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE, "gfs2-qd");
+       if (!gfs2_qd_shrinker)
+               return -ENOMEM;
+
+       gfs2_qd_shrinker->count_objects = gfs2_qd_shrink_count;
+       gfs2_qd_shrinker->scan_objects = gfs2_qd_shrink_scan;
+       gfs2_qd_shrinker->seeks = DEFAULT_SEEKS;
+
+       shrinker_register(gfs2_qd_shrinker);
 
+       return 0;
+}
+
+void gfs2_qd_shrinker_exit(void)
+{
+       shrinker_free(gfs2_qd_shrinker);
+}
 
 static u64 qd2index(struct gfs2_quota_data *qd)
 {
diff --git a/fs/gfs2/quota.h b/fs/gfs2/quota.h
index 21ada332d555..f0d54dcbbc75 100644
--- a/fs/gfs2/quota.h
+++ b/fs/gfs2/quota.h
@@ -59,7 +59,8 @@ static inline int gfs2_quota_lock_check(struct gfs2_inode *ip,
 }
 
 extern const struct quotactl_ops gfs2_quotactl_ops;
-extern struct shrinker gfs2_qd_shrinker;
+int __init gfs2_qd_shrinker_init(void);
+void gfs2_qd_shrinker_exit(void);
 extern struct list_lru gfs2_qd_lru;
 extern void __init gfs2_quota_hash_init(void);
 
-- 
2.30.2