linux-kernel - Re: [PATCH 2/2] bcache: Convert to lock_cmp

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Date:   Wed, 10 May 2023 13:25:21 +0800
From:   Coly Li <colyli@...e.de>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: Re: [PATCH 2/2] bcache: Convert to lock_cmp_fn



> 2023年5月10日 03:58，Kent Overstreet <kent.overstreet@...ux.dev> 写道：
> 
> Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
> Cc: Coly Li <colyli@...e.de>

Acked-by: Coly Li <colyli@...e.de <mailto:colyli@...e.de>>

Thanks for this change :-)

Coly Li


> ---
> drivers/md/bcache/btree.c | 23 ++++++++++++++++++++++-
> drivers/md/bcache/btree.h |  4 ++--
> 2 files changed, 24 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
> index 147c493a98..569f48958b 100644
> --- a/drivers/md/bcache/btree.c
> +++ b/drivers/md/bcache/btree.c
> @@ -559,6 +559,27 @@ static void mca_data_alloc(struct btree *b, struct bkey *k, gfp_t gfp)
> }
> }
> 
> +#define cmp_int(l, r) ((l > r) - (l < r))
> +
> +#ifdef CONFIG_PROVE_LOCKING
> +static int btree_lock_cmp_fn(const struct lockdep_map *_a,
> +     const struct lockdep_map *_b)
> +{
> + const struct btree *a = container_of(_a, struct btree, lock.dep_map);
> + const struct btree *b = container_of(_b, struct btree, lock.dep_map);
> +
> + return -cmp_int(a->level, b->level) ?: bkey_cmp(&a->key, &b->key);
> +}
> +
> +static void btree_lock_print_fn(const struct lockdep_map *map)
> +{
> + const struct btree *b = container_of(map, struct btree, lock.dep_map);
> +
> + printk(KERN_CONT " l=%u %llu:%llu", b->level,
> +       KEY_INODE(&b->key), KEY_OFFSET(&b->key));
> +}
> +#endif
> +
> static struct btree *mca_bucket_alloc(struct cache_set *c,
>      struct bkey *k, gfp_t gfp)
> {
> @@ -572,7 +593,7 @@ static struct btree *mca_bucket_alloc(struct cache_set *c,
> return NULL;
> 
> init_rwsem(&b->lock);
> - lockdep_set_novalidate_class(&b->lock);
> + lock_set_cmp_fn(&b->lock, btree_lock_cmp_fn, btree_lock_print_fn);
> mutex_init(&b->write_lock);
> lockdep_set_novalidate_class(&b->write_lock);
> INIT_LIST_HEAD(&b->list);
> diff --git a/drivers/md/bcache/btree.h b/drivers/md/bcache/btree.h
> index 1b5fdbc0d8..17b1d201ce 100644
> --- a/drivers/md/bcache/btree.h
> +++ b/drivers/md/bcache/btree.h
> @@ -247,8 +247,8 @@ static inline void bch_btree_op_init(struct btree_op *op, int write_lock_level)
> 
> static inline void rw_lock(bool w, struct btree *b, int level)
> {
> - w ? down_write_nested(&b->lock, level + 1)
> -  : down_read_nested(&b->lock, level + 1);
> + w ? down_write(&b->lock)
> +  : down_read(&b->lock);
> if (w)
> b->seq++;
> }
> -- 
> 2.40.1
>