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block: add internal hd part table references

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We can't use krefs since it's apparently restricted to very basic
reference counting.

This reverts commit e4a683c8.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Jens Axboe
2011-01-07 08:43:37 +01:00
parent 09e099d4ba
commit 6c23a9681c
7 changed files with 34 additions and 25 deletions
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27
include/linux/genhd.h
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@@ -115,8 +115,8 @@ struct hd_struct {
#else
struct disk_stats dkstats;
#endif
atomic_t ref;
struct rcu_head rcu_head;
struct kref ref;
};
#define GENHD_FL_REMOVABLE 1
@@ -584,7 +584,7 @@ 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 kref *ref);
extern void __delete_partition(struct hd_struct *);
extern void delete_partition(struct gendisk *, int);
extern void printk_all_partitions(void);
@@ -613,6 +613,29 @@ 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)
{
atomic_set(&part->ref, 1);
smp_mb();
}
static inline void hd_struct_get(struct hd_struct *part)
{
atomic_inc(&part->ref);
smp_mb__after_atomic_inc();
}
static inline int hd_struct_try_get(struct hd_struct *part)
{
return atomic_inc_not_zero(&part->ref);
}
static inline void hd_struct_put(struct hd_struct *part)
{
if (atomic_dec_and_test(&part->ref))
__delete_partition(part);
}
#else /* CONFIG_BLOCK */
static inline void printk_all_partitions(void) { }