Use new APIs to dynamically allocate the nfsd-filecache shrinker.

Signed-off-by: Qi Zheng <redacted>
Reviewed-by: Muchun Song <redacted>
---
  fs/nfsd/filecache.c | 22 ++++++++++++----------
  1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index ee9c923192e0..872eb9501965 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c

@@ -521,11 +521,7 @@ nfsd_file_lru_scan(struct shrinker *s, struct shrink_control *sc)
  	return ret;
  }
  
-static struct shrinker	nfsd_file_shrinker = {
-	.scan_objects = nfsd_file_lru_scan,
-	.count_objects = nfsd_file_lru_count,
-	.seeks = 1,
-};
+static struct shrinker *nfsd_file_shrinker;
  
  /**
   * nfsd_file_cond_queue - conditionally unhash and queue a nfsd_file

@@ -746,12 +742,18 @@ nfsd_file_cache_init(void)
  		goto out_err;
  	}
  
-	ret = register_shrinker(&nfsd_file_shrinker, "nfsd-filecache");
-	if (ret) {
-		pr_err("nfsd: failed to register nfsd_file_shrinker: %d\n", ret);
+	nfsd_file_shrinker = shrinker_alloc(0, "nfsd-filecache");
+	if (!nfsd_file_shrinker) {

+		pr_err("nfsd: failed to allocate nfsd_file_shrinker\n");
  		goto out_lru;
  	}
  
+	nfsd_file_shrinker->count_objects = nfsd_file_lru_count;
+	nfsd_file_shrinker->scan_objects = nfsd_file_lru_scan;
+	nfsd_file_shrinker->seeks = 1;
+
+	shrinker_register(nfsd_file_shrinker);
+
  	ret = lease_register_notifier(&nfsd_file_lease_notifier);
  	if (ret) {
  		pr_err("nfsd: unable to register lease notifier: %d\n", ret);

@@ -774,7 +776,7 @@ nfsd_file_cache_init(void)
  out_notifier:
  	lease_unregister_notifier(&nfsd_file_lease_notifier);
  out_shrinker:
-	unregister_shrinker(&nfsd_file_shrinker);
+	shrinker_free(nfsd_file_shrinker);
  out_lru:
  	list_lru_destroy(&nfsd_file_lru);
  out_err:

@@ -891,7 +893,7 @@ nfsd_file_cache_shutdown(void)
  		return;
  
  	lease_unregister_notifier(&nfsd_file_lease_notifier);
-	unregister_shrinker(&nfsd_file_shrinker);
+	shrinker_free(nfsd_file_shrinker);
  	/*
  	 * make sure all callers of nfsd_file_lru_cb are done before
  	 * calling nfsd_file_cache_purge