In preparation for implementing lockless slab shrink, we need to dynamically allocate the dm-zoned-meta shrinker, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct dmz_metadata. Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> --- drivers/md/dm-zoned-metadata.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c index 9d3cca8e3dc9..41b10ffb968a 100644 --- a/drivers/md/dm-zoned-metadata.c +++ b/drivers/md/dm-zoned-metadata.c @@ -187,7 +187,7 @@ struct dmz_metadata { struct rb_root mblk_rbtree; struct list_head mblk_lru_list; struct list_head mblk_dirty_list; - struct shrinker mblk_shrinker; + struct shrinker *mblk_shrinker; /* Zone allocation management */ struct mutex map_lock; @@ -615,7 +615,7 @@ static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, struct shrink_control *sc) { - struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); + struct dmz_metadata *zmd = shrink->private_data; return atomic_read(&zmd->nr_mblks); } @@ -626,7 +626,7 @@ static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc) { - struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); + struct dmz_metadata *zmd = shrink->private_data; unsigned long count; spin_lock(&zmd->mblk_lock); @@ -2936,17 +2936,22 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, */ zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; zmd->max_nr_mblks = zmd->min_nr_mblks + 512; - zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; - zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; - zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; + + zmd->mblk_shrinker = shrinker_alloc_and_init(dmz_mblock_shrinker_count, + dmz_mblock_shrinker_scan, + 0, DEFAULT_SEEKS, 0, zmd); + if (!zmd->mblk_shrinker) { + dmz_zmd_err(zmd, "allocate metadata cache shrinker failed"); + goto err; + } /* Metadata cache shrinker */ - ret = register_shrinker(&zmd->mblk_shrinker, "dm-zoned-meta:(%u:%u)", + ret = register_shrinker(zmd->mblk_shrinker, "dm-zoned-meta:(%u:%u)", MAJOR(dev->bdev->bd_dev), MINOR(dev->bdev->bd_dev)); if (ret) { dmz_zmd_err(zmd, "Register metadata cache shrinker failed"); - goto err; + goto err_shrinker; } dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version); @@ -2982,6 +2987,8 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, *metadata = zmd; return 0; +err_shrinker: + shrinker_free(zmd->mblk_shrinker); err: dmz_cleanup_metadata(zmd); kfree(zmd); @@ -2995,7 +3002,7 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, */ void dmz_dtr_metadata(struct dmz_metadata *zmd) { - unregister_shrinker(&zmd->mblk_shrinker); + unregister_and_free_shrinker(zmd->mblk_shrinker); dmz_cleanup_metadata(zmd); kfree(zmd); } -- 2.30.2