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volume: Introduce general IO forward mechanism

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Allow the core volume IOs to be forwarded directly to backend volumes to
avoid unnecessary allocations.

Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
This commit is contained in:
Robert Baldyga
2023-08-22 21:11:25 +02:00
committed by Michal Mielewczyk
parent edce2c26a5
commit 7e73de0d51
10 changed files with 548 additions and 3 deletions
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127
src/ocf_request.c
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@@ -431,3 +431,130 @@ void ocf_req_hash(struct ocf_request *req)
ocf_core_get_id(req->core));
}
}
void ocf_req_forward_cache_io(struct ocf_request *req, int dir, uint64_t addr,
uint64_t bytes, uint64_t offset)
{
ocf_volume_t volume = ocf_cache_get_volume(req->cache);
ocf_forward_token_t token = ocf_req_to_cache_forward_token(req);
req->cache_error = 0;
ocf_req_forward_cache_get(req);
ocf_volume_forward_io(volume, token, dir, addr, bytes, offset);
}
void ocf_req_forward_cache_flush(struct ocf_request *req)
{
ocf_volume_t volume = ocf_cache_get_volume(req->cache);
ocf_forward_token_t token = ocf_req_to_cache_forward_token(req);
req->cache_error = 0;
ocf_req_forward_cache_get(req);
ocf_volume_forward_flush(volume, token);
}
void ocf_req_forward_cache_discard(struct ocf_request *req, uint64_t addr,
uint64_t bytes)
{
ocf_volume_t volume = ocf_cache_get_volume(req->cache);
ocf_forward_token_t token = ocf_req_to_cache_forward_token(req);
req->cache_error = 0;
ocf_req_forward_cache_get(req);
ocf_volume_forward_discard(volume, token, addr, bytes);
}
void ocf_req_forward_core_io(struct ocf_request *req, int dir, uint64_t addr,
uint64_t bytes, uint64_t offset)
{
ocf_volume_t volume = ocf_core_get_volume(req->core);
ocf_forward_token_t token = ocf_req_to_core_forward_token(req);
req->core_error = 0;
ocf_req_forward_core_get(req);
ocf_volume_forward_io(volume, token, dir, addr, bytes, offset);
}
void ocf_req_forward_core_flush(struct ocf_request *req)
{
ocf_volume_t volume = ocf_core_get_volume(req->core);
ocf_forward_token_t token = ocf_req_to_core_forward_token(req);
req->core_error = 0;
ocf_req_forward_core_get(req);
ocf_volume_forward_flush(volume, token);
}
void ocf_req_forward_core_discard(struct ocf_request *req, uint64_t addr,
uint64_t bytes)
{
ocf_volume_t volume = ocf_core_get_volume(req->core);
ocf_forward_token_t token = ocf_req_to_core_forward_token(req);
req->core_error = 0;
ocf_req_forward_core_get(req);
ocf_volume_forward_discard(volume, token, addr, bytes);
}
struct ocf_io *ocf_forward_get_io(ocf_forward_token_t token)
{
struct ocf_request *req = (struct ocf_request *)(token & ~1);
return &req->ioi.io;
}
static inline void _ocf_forward_get(ocf_forward_token_t token)
{
struct ocf_request *req = (struct ocf_request *)(token & ~1);
if (token & 1)
ocf_req_forward_cache_get(req);
else
ocf_req_forward_core_get(req);
}
void ocf_forward_get(ocf_forward_token_t token)
{
_ocf_forward_get(token);
}
void ocf_forward_io(ocf_volume_t volume, ocf_forward_token_t token,
int dir, uint64_t addr, uint64_t bytes, uint64_t offset)
{
_ocf_forward_get(token);
ocf_volume_forward_io(volume, token, dir, addr, bytes, offset);
}
void ocf_forward_flush(ocf_volume_t volume, ocf_forward_token_t token)
{
_ocf_forward_get(token);
ocf_volume_forward_flush(volume, token);
}
void ocf_forward_discard(ocf_volume_t volume, ocf_forward_token_t token,
uint64_t addr, uint64_t bytes)
{
_ocf_forward_get(token);
ocf_volume_forward_discard(volume, token, addr, bytes);
}
void ocf_forward_end(ocf_forward_token_t token, int error)
{
struct ocf_request *req = ocf_req_forward_token_to_req(token);
req->error |= error;
if (token & 1) {
req->cache_error = req->cache_error ?: error;
ocf_req_forward_cache_put(req);
} else {
req->core_error = req->core_error ?: error;
ocf_req_forward_core_put(req);
}
}