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Remove exported object kobj

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Simplify exported object lifecycle.

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
This commit is contained in:
Robert Baldyga 2022-09-16 22:38:10 +02:00
parent ad783917d0
commit 2f54aea87d
3 changed files with 69 additions and 124 deletions
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177
modules/cas_cache/exp_obj.c
View File

@ -19,11 +19,6 @@
#define CAS_DEV_MINORS 16
#define KMEM_CACHE_MIN_SIZE sizeof(void *)
static inline struct cas_exp_obj *cas_kobj_to_exp_obj(struct kobject *kobj)
{
return container_of(kobj, struct cas_exp_obj, kobj);
}
static inline int bd_claim_by_disk(struct block_device *bdev, void *holder,
struct gendisk *disk)
{
@ -295,64 +290,15 @@ static int cas_exp_obj_alloc(struct cas_disk *dsk)
return 0;
}
void cas_exp_obj_free(struct cas_disk *dsk)
static void cas_exp_obj_free(struct cas_disk *dsk)
{
struct cas_exp_obj *exp_obj;
CAS_DEBUG_DISK_TRACE(dsk);
exp_obj = dsk->exp_obj;
if (!exp_obj)
if (!dsk->exp_obj)
return;
kobject_put(&exp_obj->kobj);
kmem_cache_free(cas_module.exp_obj_cache, dsk->exp_obj);
dsk->exp_obj = NULL;
}
static void __cas_exp_obj_release(struct cas_exp_obj *exp_obj)
{
kmem_cache_free(cas_module.exp_obj_cache, exp_obj);
}
static void _cas_exp_obj_release(struct kobject *kobj)
{
struct cas_exp_obj *exp_obj;
struct module *owner;
BUG_ON(!kobj);
exp_obj = cas_kobj_to_exp_obj(kobj);
BUG_ON(!exp_obj);
CAS_DEBUG_TRACE();
owner = exp_obj->owner;
kfree(exp_obj->dev_name);
__cas_exp_obj_release(exp_obj);
if (owner)
module_put(owner);
}
static struct kobj_type cas_exp_obj_ktype = {
.release = _cas_exp_obj_release
};
static int _cas_exp_obj_init_kobject(struct cas_disk *dsk)
{
int result = 0;
struct cas_exp_obj *exp_obj = dsk->exp_obj;
kobject_init(&exp_obj->kobj, &cas_exp_obj_ktype);
result = kobject_add(&exp_obj->kobj, &dsk->kobj,
"%s", exp_obj->dev_name);
if (result)
CAS_DEBUG_DISK_ERROR(dsk, "Cannot register kobject");
return result;
}
static CAS_BLK_STATUS_T _cas_exp_obj_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@ -437,11 +383,6 @@ int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name,
exp_obj->owner = owner;
exp_obj->ops = ops;
result = _cas_exp_obj_init_kobject(dsk);
if (result) {
goto error_init_kobject;
}
result = _cas_init_tag_set(dsk, &dsk->tag_set);
if (result) {
goto error_init_tag_set;
@ -489,36 +430,17 @@ error_exp_obj_set_dev_t:
error_alloc_mq_disk:
blk_mq_free_tag_set(&dsk->tag_set);
error_init_tag_set:
kobject_put(&exp_obj->kobj);
/* kobject put does all the cleanup below internally */
return result;
error_init_kobject:
module_put(owner);
dsk->exp_obj->owner = NULL;
error_module_get:
kfree(exp_obj->dev_name);
error_kstrdup:
__cas_exp_obj_release(exp_obj);
dsk->exp_obj = NULL;
cas_exp_obj_free(dsk);
error_exp_obj_alloc:
return result;
}
struct request_queue *cas_exp_obj_get_queue(struct cas_disk *dsk)
{
BUG_ON(!dsk);
BUG_ON(!dsk->exp_obj);
return dsk->exp_obj->queue;
}
struct gendisk *cas_exp_obj_get_gendisk(struct cas_disk *dsk)
{
BUG_ON(!dsk);
BUG_ON(!dsk->exp_obj);
return dsk->exp_obj->gd;
}
static bool _cas_exp_obj_exists(const char *path)
{
struct file *exported;
@ -568,24 +490,66 @@ int cas_exp_obj_activate(struct cas_disk *dsk)
if (result)
goto error_bd_claim;
result = sysfs_create_link(&dsk->exp_obj->kobj,
&disk_to_dev(dsk->exp_obj->gd)->kobj,
"blockdev");
if (result)
goto error_sysfs_link;
CAS_DEBUG_DISK(dsk, "Activated exp object %s", dsk->exp_obj->dev_name);
return 0;
error_sysfs_link:
bd_release_from_disk(dsk->bd, dsk->exp_obj->gd);
error_bd_claim:
del_gendisk(dsk->exp_obj->gd);
dsk->exp_obj->activated = false;
return result;
}
int cas_exp_obj_destroy(struct cas_disk *dsk)
{
struct cas_exp_obj *exp_obj;
BUG_ON(!dsk);
if (!dsk->exp_obj)
return -ENODEV;
CAS_DEBUG_DISK_TRACE(dsk);
exp_obj = dsk->exp_obj;
if (dsk->exp_obj->activated) {
bd_release_from_disk(dsk->bd, exp_obj->gd);
_cas_exp_obj_clear_dev_t(dsk);
del_gendisk(exp_obj->gd);
}
if (exp_obj->queue)
blk_cleanup_queue(exp_obj->queue);
blk_mq_free_tag_set(&dsk->tag_set);
put_disk(exp_obj->gd);
return 0;
}
void cas_exp_obj_cleanup(struct cas_disk *dsk)
{
struct cas_exp_obj *exp_obj;
struct module *owner;
CAS_DEBUG_DISK_TRACE(dsk);
exp_obj = dsk->exp_obj;
if (!exp_obj)
return;
owner = exp_obj->owner;
kfree(exp_obj->dev_name);
cas_exp_obj_free(dsk);
if (owner)
module_put(owner);
}
int cas_exp_obj_lock(struct cas_disk *dsk)
{
struct cas_exp_obj *exp_obj;
@ -621,33 +585,16 @@ int cas_exp_obj_unlock(struct cas_disk *dsk)
return 0;
}
int cas_exp_obj_destroy(struct cas_disk *dsk)
struct request_queue *cas_exp_obj_get_queue(struct cas_disk *dsk)
{
struct cas_exp_obj *exp_obj;
BUG_ON(!dsk);
if (!dsk->exp_obj)
return -ENODEV;
CAS_DEBUG_DISK_TRACE(dsk);
exp_obj = dsk->exp_obj;
if (dsk->exp_obj->activated) {
sysfs_remove_link(&exp_obj->kobj, "blockdev");
bd_release_from_disk(dsk->bd, exp_obj->gd);
_cas_exp_obj_clear_dev_t(dsk);
del_gendisk(exp_obj->gd);
BUG_ON(!dsk->exp_obj);
return dsk->exp_obj->queue;
}
if (exp_obj->queue)
blk_cleanup_queue(exp_obj->queue);
blk_mq_free_tag_set(&dsk->tag_set);
put_disk(exp_obj->gd);
return 0;
struct gendisk *cas_exp_obj_get_gendisk(struct cas_disk *dsk)
{
BUG_ON(!dsk);
BUG_ON(!dsk->exp_obj);
return dsk->exp_obj->gd;
}

4
modules/cas_cache/exp_obj.h
View File

@ -5,7 +5,6 @@
#ifndef __CASDISK_EXP_OBJ_H__
#define __CASDISK_EXP_OBJ_H__
#include <linux/kobject.h>
#include <linux/fs.h>
struct cas_disk;
@ -39,7 +38,6 @@ struct cas_exp_obj {
struct cas_exp_obj_ops *ops;
const char *dev_name;
struct kobject kobj;
atomic_t pt_ios;
atomic_t *pending_rqs;
@ -48,7 +46,7 @@ struct cas_exp_obj {
int __init cas_init_exp_objs(void);
void cas_deinit_exp_objs(void);
void cas_exp_obj_free(struct cas_disk *dsk);
void cas_exp_obj_cleanup(struct cas_disk *dsk);
/**
* @brief Create exported object (top device)

8
modules/cas_cache/volume/vol_block_dev_top.c
View File

@ -588,7 +588,7 @@ static int kcas_volume_destroy_exported_object(ocf_volume_t volume)
destroy_workqueue(bvol->expobj_wq);
cas_exp_obj_unlock(bvol->dsk);
cas_exp_obj_free(bvol->dsk);
cas_exp_obj_cleanup(bvol->dsk);
return 0;
@ -759,11 +759,11 @@ static int kcas_core_stop_exported_object(ocf_core_t core, void *cntx)
return 0;
}
static int kcas_core_free_exported_object(ocf_core_t core, void *cntx)
static int kcas_core_cleanup_exported_object(ocf_core_t core, void *cntx)
{
struct bd_object *bvol = bd_object(ocf_core_get_volume(core));
cas_exp_obj_free(bvol->dsk);
cas_exp_obj_cleanup(bvol->dsk);
return 0;
}
@ -783,7 +783,7 @@ int kcas_cache_destroy_all_core_exported_objects(ocf_cache_t cache)
}
ocf_core_visit(cache, kcas_core_stop_exported_object, NULL, true);
ocf_core_visit(cache, kcas_core_free_exported_object, NULL, true);
ocf_core_visit(cache, kcas_core_cleanup_exported_object, NULL, true);
return 0;
}