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Message-ID: <152565448804.30131.11034805069882522609.stgit@noble>
Date: Mon, 07 May 2018 10:54:48 +1000
From: NeilBrown <neilb@...e.com>
To: Oleg Drokin <oleg.drokin@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
James Simmons <jsimmons@...radead.org>,
Andreas Dilger <andreas.dilger@...el.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: [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.
Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
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 | 51 +++++++++++++++++---
4 files changed, 55 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..83dacc413c32 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 +113,18 @@ 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;
+}
+EXPORT_SYMBOL(lu_site_wq_from_fid);
+
/**
* 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 +325,7 @@ 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 +333,7 @@ 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 +361,8 @@ 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 +786,7 @@ 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 +799,8 @@ 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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