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Date: Wed, 2 May 2018 04:02:09 +0100 (BST)
From: James Simmons <jsimmons@...radead.org>
To: NeilBrown <neilb@...e.com>
cc: Oleg Drokin <oleg.drokin@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andreas Dilger <andreas.dilger@...el.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 02/10] staging: lustre: make struct lu_site_bkt_data
private
> This data structure only needs to be public so that
> various modules can access a wait queue to wait for object
> destruction.
> If we provide a function to get the wait queue, rather than the
> whole bucket, the structure can be made private.
>
> Signed-off-by: NeilBrown <neilb@...e.com>
> ---
> drivers/staging/lustre/lustre/include/lu_object.h | 36 +-------------
> drivers/staging/lustre/lustre/llite/lcommon_cl.c | 8 ++-
> drivers/staging/lustre/lustre/lov/lov_object.c | 8 ++-
> drivers/staging/lustre/lustre/obdclass/lu_object.c | 50 +++++++++++++++++---
> 4 files changed, 54 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/staging/lustre/lustre/include/lu_object.h b/drivers/staging/lustre/lustre/include/lu_object.h
> index c3b0ed518819..f29bbca5af65 100644
> --- a/drivers/staging/lustre/lustre/include/lu_object.h
> +++ b/drivers/staging/lustre/lustre/include/lu_object.h
> @@ -549,31 +549,7 @@ struct lu_object_header {
> };
>
> struct fld;
> -
> -struct lu_site_bkt_data {
> - /**
> - * number of object in this bucket on the lsb_lru list.
> - */
> - long lsb_lru_len;
> - /**
> - * LRU list, updated on each access to object. Protected by
> - * bucket lock of lu_site::ls_obj_hash.
> - *
> - * "Cold" end of LRU is lu_site::ls_lru.next. Accessed object are
> - * moved to the lu_site::ls_lru.prev (this is due to the non-existence
> - * of list_for_each_entry_safe_reverse()).
> - */
> - struct list_head lsb_lru;
> - /**
> - * Wait-queue signaled when an object in this site is ultimately
> - * destroyed (lu_object_free()). It is used by lu_object_find() to
> - * wait before re-trying when object in the process of destruction is
> - * found in the hash table.
> - *
> - * \see htable_lookup().
> - */
> - wait_queue_head_t lsb_marche_funebre;
> -};
> +struct lu_site_bkt_data;
>
> enum {
> LU_SS_CREATED = 0,
> @@ -642,14 +618,8 @@ struct lu_site {
> struct percpu_counter ls_lru_len_counter;
> };
>
> -static inline struct lu_site_bkt_data *
> -lu_site_bkt_from_fid(struct lu_site *site, struct lu_fid *fid)
> -{
> - struct cfs_hash_bd bd;
> -
> - cfs_hash_bd_get(site->ls_obj_hash, fid, &bd);
> - return cfs_hash_bd_extra_get(site->ls_obj_hash, &bd);
> -}
> +wait_queue_head_t *
> +lu_site_wq_from_fid(struct lu_site *site, struct lu_fid *fid);
>
> static inline struct seq_server_site *lu_site2seq(const struct lu_site *s)
> {
> diff --git a/drivers/staging/lustre/lustre/llite/lcommon_cl.c b/drivers/staging/lustre/lustre/llite/lcommon_cl.c
> index df5c0c0ae703..d5b42fb1d601 100644
> --- a/drivers/staging/lustre/lustre/llite/lcommon_cl.c
> +++ b/drivers/staging/lustre/lustre/llite/lcommon_cl.c
> @@ -211,12 +211,12 @@ static void cl_object_put_last(struct lu_env *env, struct cl_object *obj)
>
> if (unlikely(atomic_read(&header->loh_ref) != 1)) {
> struct lu_site *site = obj->co_lu.lo_dev->ld_site;
> - struct lu_site_bkt_data *bkt;
> + wait_queue_head_t *wq;
>
> - bkt = lu_site_bkt_from_fid(site, &header->loh_fid);
> + wq = lu_site_wq_from_fid(site, &header->loh_fid);
>
> init_waitqueue_entry(&waiter, current);
> - add_wait_queue(&bkt->lsb_marche_funebre, &waiter);
> + add_wait_queue(wq, &waiter);
>
> while (1) {
> set_current_state(TASK_UNINTERRUPTIBLE);
> @@ -226,7 +226,7 @@ static void cl_object_put_last(struct lu_env *env, struct cl_object *obj)
> }
>
> set_current_state(TASK_RUNNING);
> - remove_wait_queue(&bkt->lsb_marche_funebre, &waiter);
> + remove_wait_queue(wq, &waiter);
> }
>
> cl_object_put(env, obj);
> diff --git a/drivers/staging/lustre/lustre/lov/lov_object.c b/drivers/staging/lustre/lustre/lov/lov_object.c
> index f7c69680cb7d..adc90f310fd7 100644
> --- a/drivers/staging/lustre/lustre/lov/lov_object.c
> +++ b/drivers/staging/lustre/lustre/lov/lov_object.c
> @@ -370,7 +370,7 @@ static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
> struct cl_object *sub;
> struct lov_layout_raid0 *r0;
> struct lu_site *site;
> - struct lu_site_bkt_data *bkt;
> + wait_queue_head_t *wq;
> wait_queue_entry_t *waiter;
>
> r0 = &lov->u.raid0;
> @@ -378,7 +378,7 @@ static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
>
> sub = lovsub2cl(los);
> site = sub->co_lu.lo_dev->ld_site;
> - bkt = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
> + wq = lu_site_wq_from_fid(site, &sub->co_lu.lo_header->loh_fid);
>
> cl_object_kill(env, sub);
> /* release a reference to the sub-object and ... */
> @@ -391,7 +391,7 @@ static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
> if (r0->lo_sub[idx] == los) {
> waiter = &lov_env_info(env)->lti_waiter;
> init_waitqueue_entry(waiter, current);
> - add_wait_queue(&bkt->lsb_marche_funebre, waiter);
> + add_wait_queue(wq, waiter);
> set_current_state(TASK_UNINTERRUPTIBLE);
> while (1) {
> /* this wait-queue is signaled at the end of
> @@ -408,7 +408,7 @@ static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
> break;
> }
> }
> - remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
> + remove_wait_queue(wq, waiter);
> }
> LASSERT(!r0->lo_sub[idx]);
> }
> diff --git a/drivers/staging/lustre/lustre/obdclass/lu_object.c b/drivers/staging/lustre/lustre/obdclass/lu_object.c
> index 3de7dc0497c4..2a8a25d6edb5 100644
> --- a/drivers/staging/lustre/lustre/obdclass/lu_object.c
> +++ b/drivers/staging/lustre/lustre/obdclass/lu_object.c
> @@ -56,6 +56,31 @@
> #include <lu_ref.h>
> #include <linux/list.h>
>
> +struct lu_site_bkt_data {
> + /**
> + * number of object in this bucket on the lsb_lru list.
> + */
> + long lsb_lru_len;
> + /**
> + * LRU list, updated on each access to object. Protected by
> + * bucket lock of lu_site::ls_obj_hash.
> + *
> + * "Cold" end of LRU is lu_site::ls_lru.next. Accessed object are
> + * moved to the lu_site::ls_lru.prev (this is due to the non-existence
> + * of list_for_each_entry_safe_reverse()).
> + */
> + struct list_head lsb_lru;
> + /**
> + * Wait-queue signaled when an object in this site is ultimately
> + * destroyed (lu_object_free()). It is used by lu_object_find() to
> + * wait before re-trying when object in the process of destruction is
> + * found in the hash table.
> + *
> + * \see htable_lookup().
> + */
> + wait_queue_head_t lsb_marche_funebre;
> +};
> +
> enum {
> LU_CACHE_PERCENT_MAX = 50,
> LU_CACHE_PERCENT_DEFAULT = 20
> @@ -88,6 +113,17 @@ MODULE_PARM_DESC(lu_cache_nr, "Maximum number of objects in lu_object cache");
> static void lu_object_free(const struct lu_env *env, struct lu_object *o);
> static __u32 ls_stats_read(struct lprocfs_stats *stats, int idx);
>
> +wait_queue_head_t *
> +lu_site_wq_from_fid(struct lu_site *site, struct lu_fid *fid)
> +{
> + struct cfs_hash_bd bd;
> + struct lu_site_bkt_data *bkt;
> +
> + cfs_hash_bd_get(site->ls_obj_hash, fid, &bd);
> + bkt = cfs_hash_bd_extra_get(site->ls_obj_hash, &bd);
> + return &bkt->lsb_marche_funebre;
> +}
> +
Nak. You forgot the EXPORT_SYMBOL for this. Once I added the export symbol
it seems to work so far in my testing.
> /**
> * Decrease reference counter on object. If last reference is freed, return
> * object to the cache, unless lu_object_is_dying(o) holds. In the latter
> @@ -288,7 +324,7 @@ static struct lu_object *lu_object_alloc(const struct lu_env *env,
> */
> static void lu_object_free(const struct lu_env *env, struct lu_object *o)
> {
> - struct lu_site_bkt_data *bkt;
> + wait_queue_head_t *wq;
> struct lu_site *site;
> struct lu_object *scan;
> struct list_head *layers;
> @@ -296,7 +332,7 @@ static void lu_object_free(const struct lu_env *env, struct lu_object *o)
>
> site = o->lo_dev->ld_site;
> layers = &o->lo_header->loh_layers;
> - bkt = lu_site_bkt_from_fid(site, &o->lo_header->loh_fid);
> + wq = lu_site_wq_from_fid(site, &o->lo_header->loh_fid);
> /*
> * First call ->loo_object_delete() method to release all resources.
> */
> @@ -324,8 +360,8 @@ static void lu_object_free(const struct lu_env *env, struct lu_object *o)
> o->lo_ops->loo_object_free(env, o);
> }
>
> - if (waitqueue_active(&bkt->lsb_marche_funebre))
> - wake_up_all(&bkt->lsb_marche_funebre);
> + if (waitqueue_active(wq))
> + wake_up_all(wq);
> }
>
> /**
> @@ -749,7 +785,7 @@ struct lu_object *lu_object_find_at(const struct lu_env *env,
> const struct lu_fid *f,
> const struct lu_object_conf *conf)
> {
> - struct lu_site_bkt_data *bkt;
> + wait_queue_head_t *wq;
> struct lu_object *obj;
> wait_queue_entry_t wait;
>
> @@ -762,8 +798,8 @@ struct lu_object *lu_object_find_at(const struct lu_env *env,
> * wait queue.
> */
> schedule();
> - bkt = lu_site_bkt_from_fid(dev->ld_site, (void *)f);
> - remove_wait_queue(&bkt->lsb_marche_funebre, &wait);
> + wq = lu_site_wq_from_fid(dev->ld_site, (void *)f);
> + remove_wait_queue(wq, &wait);
> }
> }
> EXPORT_SYMBOL(lu_object_find_at);
>
>
>
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