[PATCH v4 10/48] f2fs: dynamically allocate the f2fs-shrinker

[Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>]

Use new APIs to dynamically allocate the f2fs-shrinker.

Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
---
 fs/f2fs/super.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index aa1f9a3a8037..9092310582aa 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -83,11 +83,27 @@ void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, 
unsigned int rate,
 #endif
 
 /* f2fs-wide shrinker description */
-static struct shrinker f2fs_shrinker_info = {
-       .scan_objects = f2fs_shrink_scan,
-       .count_objects = f2fs_shrink_count,
-       .seeks = DEFAULT_SEEKS,
-};
+static struct shrinker *f2fs_shrinker_info;
+
+static int __init f2fs_init_shrinker(void)
+{
+       f2fs_shrinker_info = shrinker_alloc(0, "f2fs-shrinker");
+       if (!f2fs_shrinker_info)
+               return -ENOMEM;
+
+       f2fs_shrinker_info->count_objects = f2fs_shrink_count;
+       f2fs_shrinker_info->scan_objects = f2fs_shrink_scan;
+       f2fs_shrinker_info->seeks = DEFAULT_SEEKS;
+
+       shrinker_register(f2fs_shrinker_info);
+
+       return 0;
+}
+
+static void f2fs_exit_shrinker(void)
+{
+       shrinker_free(f2fs_shrinker_info);
+}
 
 enum {
        Opt_gc_background,
@@ -4940,7 +4956,7 @@ static int __init init_f2fs_fs(void)
        err = f2fs_init_sysfs();
        if (err)
                goto free_garbage_collection_cache;
-       err = register_shrinker(&f2fs_shrinker_info, "f2fs-shrinker");
+       err = f2fs_init_shrinker();
        if (err)
                goto free_sysfs;
        err = register_filesystem(&f2fs_fs_type);
@@ -4985,7 +5001,7 @@ static int __init init_f2fs_fs(void)
        f2fs_destroy_root_stats();
        unregister_filesystem(&f2fs_fs_type);
 free_shrinker:
-       unregister_shrinker(&f2fs_shrinker_info);
+       f2fs_exit_shrinker();
 free_sysfs:
        f2fs_exit_sysfs();
 free_garbage_collection_cache:
@@ -5017,7 +5033,7 @@ static void __exit exit_f2fs_fs(void)
        f2fs_destroy_post_read_processing();
        f2fs_destroy_root_stats();
        unregister_filesystem(&f2fs_fs_type);
-       unregister_shrinker(&f2fs_shrinker_info);
+       f2fs_exit_shrinker();
        f2fs_exit_sysfs();
        f2fs_destroy_garbage_collection_cache();
        f2fs_destroy_extent_cache();
-- 
2.30.2