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Separate engine map/evict (refactoring)

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This temporarily increases amount of boiler-plate code, but
this is going to be mitigated in the following commits.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski
2019-07-30 16:03:16 -04:00
parent d91012f4b4
commit b39bcf86d4
5 changed files with 58 additions and 25 deletions
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13
src/engine/engine_wt.c
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@@ -165,6 +165,7 @@ int ocf_write_wt(struct ocf_request *req)
bool mapped;
int lock = OCF_LOCK_NOT_ACQUIRED;
struct ocf_cache *cache = req->cache;
bool promote = true;
ocf_io_start(&req->ioi.io);
@@ -185,16 +186,22 @@ int ocf_write_wt(struct ocf_request *req)
lock = ocf_req_async_lock_wr(req, ocf_engine_on_resume);
}
if (!mapped) {
promote = ocf_promotion_req_should_promote(
cache->promotion_policy, req);
}
OCF_METADATA_UNLOCK_RD(); /*- END Metadata READ access----------------*/
if (!mapped) {
if (!mapped && promote) {
OCF_METADATA_LOCK_WR(); /*- Metadata WR access, eviction -----*/
/* Now there is exclusive access for metadata. May traverse once
* again. If there are misses need to call eviction. This
* process is called 'mapping'.
*/
ocf_engine_map(req);
if (ocf_engine_evict(req) == LOOKUP_MAPPED)
ocf_engine_map(req);
if (!req->info.mapping_error) {
/* Lock request for WRITE access */
@@ -204,7 +211,7 @@ int ocf_write_wt(struct ocf_request *req)
OCF_METADATA_UNLOCK_WR(); /*- END Metadata WR access ---------*/
}
if (!req->info.mapping_error) {
if (promote && !req->info.mapping_error) {
if (lock >= 0) {
if (lock != OCF_LOCK_ACQUIRED) {
/* WR lock was not acquired, need to wait for resume */