Re: [PATCH v3 15/49] nfs: dynamically allocate the nfs-acl shrinker

[Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>]

On 2023/7/27 16:04, Qi Zheng wrote:
> Use new APIs to dynamically allocate the nfs-acl shrinker.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> ---
>   fs/nfs/super.c | 20 ++++++++++++--------
>   1 file changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index 2284f749d892..072d82e1be06 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -129,11 +129,7 @@ static void nfs_ssc_unregister_ops(void)
>   }
>   #endif /* CONFIG_NFS_V4_2 */
>   
> -static struct shrinker acl_shrinker = {
> -	.count_objects	= nfs_access_cache_count,
> -	.scan_objects	= nfs_access_cache_scan,
> -	.seeks		= DEFAULT_SEEKS,
> -};
> +static struct shrinker *acl_shrinker;
>   
>   /*
>    * Register the NFS filesystems
> @@ -153,9 +149,17 @@ int __init register_nfs_fs(void)
>   	ret = nfs_register_sysctl();
>   	if (ret < 0)
>   		goto error_2;
> -	ret = register_shrinker(&acl_shrinker, "nfs-acl");
> -	if (ret < 0)
> +
> +	acl_shrinker = shrinker_alloc(0, "nfs-acl");
> +	if (!acl_shrinker)
>   		goto error_3;

Here should set ret to -ENOMEM, will fix.

> +
> +	acl_shrinker->count_objects = nfs_access_cache_count;
> +	acl_shrinker->scan_objects = nfs_access_cache_scan;
> +	acl_shrinker->seeks = DEFAULT_SEEKS;
> +
> +	shrinker_register(acl_shrinker);
> +
>   #ifdef CONFIG_NFS_V4_2
>   	nfs_ssc_register_ops();
>   #endif
> @@ -175,7 +179,7 @@ int __init register_nfs_fs(void)
>    */
>   void __exit unregister_nfs_fs(void)
>   {
> -	unregister_shrinker(&acl_shrinker);
> +	shrinker_free(acl_shrinker);
>   	nfs_unregister_sysctl();
>   	unregister_nfs4_fs();
>   #ifdef CONFIG_NFS_V4_2