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Merge pull request #303 from arutk/fix_cl_locking

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Lock cachelines under hash bucket locks
This commit is contained in:
Robert Bałdyga 2019-10-01 15:12:31 +02:00 committed by GitHub
commit f08f8aa96e
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 15 deletions
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28
src/engine/engine_common.c
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@ -414,14 +414,16 @@ static int ocf_engine_evict(struct ocf_request *req)
ocf_engine_unmapped_count(req));
}
static int lock_clines(struct ocf_request *req, enum ocf_engine_lock_type lock,
ocf_req_async_lock_cb cb)
static int lock_clines(struct ocf_request *req,
const struct ocf_engine_callbacks *engine_cbs)
{
switch (lock) {
enum ocf_engine_lock_type lock_type = engine_cbs->get_lock_type(req);
switch (lock_type) {
case ocf_engine_lock_write:
return ocf_req_async_lock_wr(req, cb);
return ocf_req_async_lock_wr(req, engine_cbs->resume);
case ocf_engine_lock_read:
return ocf_req_async_lock_rd(req, cb);
return ocf_req_async_lock_rd(req, engine_cbs->resume);
default:
return OCF_LOCK_ACQUIRED;
}
@ -433,7 +435,6 @@ int ocf_engine_prepare_clines(struct ocf_request *req,
bool mapped;
bool promote = true;
int lock = -ENOENT;
enum ocf_engine_lock_type lock_type;
struct ocf_metadata_lock *metadata_lock = &req->cache->metadata.lock;
/* Calculate hashes for hash-bucket locking */
@ -451,8 +452,7 @@ int ocf_engine_prepare_clines(struct ocf_request *req,
if (mapped) {
/* Request cachelines are already mapped, acquire cacheline
* lock */
lock_type = engine_cbs->get_lock_type(req);
lock = lock_clines(req, lock_type, engine_cbs->resume);
lock = lock_clines(req, engine_cbs);
} else {
/* check if request should promote cachelines */
promote = ocf_promotion_req_should_promote(
@ -469,6 +469,8 @@ int ocf_engine_prepare_clines(struct ocf_request *req,
* performed holding (at least) hash-bucket write lock */
ocf_req_hash_lock_upgrade(req);
ocf_engine_map(req);
if (!req->info.mapping_error)
lock = lock_clines(req, engine_cbs);
ocf_req_hash_unlock_wr(req);
if (req->info.mapping_error) {
@ -482,14 +484,10 @@ int ocf_engine_prepare_clines(struct ocf_request *req,
if (ocf_engine_evict(req) == LOOKUP_MAPPED)
ocf_engine_map(req);
ocf_metadata_end_exclusive_access(metadata_lock);
}
if (!req->info.mapping_error)
lock = lock_clines(req, engine_cbs);
if (!req->info.mapping_error) {
/* Request mapped successfully - acquire cacheline
* lock */
lock_type = engine_cbs->get_lock_type(req);
lock = lock_clines(req, lock_type, engine_cbs->resume);
ocf_metadata_end_exclusive_access(metadata_lock);
}
}