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SubjectRe: [PATCH v3 16/49] nfsd: dynamically allocate the nfsd-filecache shrinker
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On 2023/7/27 16:04, Qi Zheng wrote:
> Use new APIs to dynamically allocate the nfsd-filecache shrinker.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
> Reviewed-by: Muchun Song <songmuchun@bytedance.com>
> ---
> 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) {

Here should set ret to -ENOMEM, will fix.

> + 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

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