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Diffstat (limited to 'include/linux/genhd.h')
-rw-r--r--include/linux/genhd.h33
1 files changed, 23 insertions, 10 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index ec274e0f4ed2..2adbfa6d02bc 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -13,6 +13,7 @@
#include <linux/kdev_t.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
+#include <linux/percpu-refcount.h>
#ifdef CONFIG_BLOCK
@@ -124,7 +125,7 @@ struct hd_struct {
#else
struct disk_stats dkstats;
#endif
- atomic_t ref;
+ struct percpu_ref ref;
struct rcu_head rcu_head;
};
@@ -611,7 +612,7 @@ extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
sector_t len, int flags,
struct partition_meta_info
*info);
-extern void __delete_partition(struct hd_struct *);
+extern void __delete_partition(struct percpu_ref *);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);
@@ -640,27 +641,39 @@ extern ssize_t part_fail_store(struct device *dev,
const char *buf, size_t count);
#endif /* CONFIG_FAIL_MAKE_REQUEST */
-static inline void hd_ref_init(struct hd_struct *part)
+static inline int hd_ref_init(struct hd_struct *part)
{
- atomic_set(&part->ref, 1);
- smp_mb();
+ if (percpu_ref_init(&part->ref, __delete_partition, 0,
+ GFP_KERNEL))
+ return -ENOMEM;
+ return 0;
}
static inline void hd_struct_get(struct hd_struct *part)
{
- atomic_inc(&part->ref);
- smp_mb__after_atomic();
+ percpu_ref_get(&part->ref);
}
static inline int hd_struct_try_get(struct hd_struct *part)
{
- return atomic_inc_not_zero(&part->ref);
+ return percpu_ref_tryget_live(&part->ref);
}
static inline void hd_struct_put(struct hd_struct *part)
{
- if (atomic_dec_and_test(&part->ref))
- __delete_partition(part);
+ percpu_ref_put(&part->ref);
+}
+
+static inline void hd_struct_kill(struct hd_struct *part)
+{
+ percpu_ref_kill(&part->ref);
+}
+
+static inline void hd_free_part(struct hd_struct *part)
+{
+ free_part_stats(part);
+ free_part_info(part);
+ percpu_ref_exit(&part->ref);
}
/*