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Add single hash bucket lock interface

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Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski
2019-08-01 16:53:20 -04:00
parent 3a70d68d38
commit 2333d837fb
4 changed files with 59 additions and 3 deletions
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47
src/concurrency/ocf_metadata_concurrency.c
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@@ -4,6 +4,7 @@
*/
#include "ocf_metadata_concurrency.h"
#include "../metadata/metadata_misc.h"
void ocf_metadata_concurrency_init(struct ocf_metadata_lock *metadata_lock)
{
@@ -20,11 +21,12 @@ void ocf_metadata_concurrency_deinit(struct ocf_metadata_lock *metadata_lock)
}
int ocf_metadata_concurrency_attached_init(
struct ocf_metadata_lock *metadata_lock,
struct ocf_metadata_lock *metadata_lock, ocf_cache_t cache,
uint64_t hash_table_entries)
{
uint64_t i;
metadata_lock->cache = cache;
metadata_lock->num_hash_entries = hash_table_entries;
metadata_lock->hash = env_vzalloc(sizeof(env_rwsem) *
hash_table_entries);
@@ -132,6 +134,49 @@ int ocf_metadata_hash_try_lock(struct ocf_metadata_lock *metadata_lock,
return 0;
}
/* NOTE: attempt to acquire hash lock for multiple core lines may end up
* in deadlock. In order to hash lock multiple core lines safely, use
* ocf_req_hash_lock_* functions */
void ocf_metadata_hash_lock_rd(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_start_shared_access(metadata_lock);
ocf_metadata_hash_lock(metadata_lock, hash, OCF_METADATA_RD);
}
void ocf_metadata_hash_unlock_rd(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_hash_unlock(metadata_lock, hash, OCF_METADATA_RD);
ocf_metadata_end_shared_access(metadata_lock);
}
void ocf_metadata_hash_lock_wr(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_start_shared_access(metadata_lock);
ocf_metadata_hash_lock(metadata_lock, hash, OCF_METADATA_WR);
}
void ocf_metadata_hash_unlock_wr(struct ocf_metadata_lock *metadata_lock,
uint32_t core_id, uint64_t core_line)
{
ocf_cache_line_t hash = ocf_metadata_hash_func(metadata_lock->cache,
core_line, core_id);
ocf_metadata_hash_unlock(metadata_lock, hash, OCF_METADATA_WR);
ocf_metadata_end_shared_access(metadata_lock);
}
#define _NUM_HASH_ENTRIES req->cache->metadata.lock.num_hash_entries
/*