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Write-only cache mode

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Write-only cache mode is similar to writeback, however read
operations do not promote data to cache. Reads are mostly serviced
by the core device, only dirty sectors are fetched from the cache.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski
2019-05-27 14:43:08 -04:00
parent ae6164a49c
commit 82e8c55f4a
17 changed files with 353 additions and 27 deletions
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8
src/engine/cache_engine.c
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@@ -15,6 +15,7 @@
#include "engine_wi.h"
#include "engine_wa.h"
#include "engine_wb.h"
#include "engine_wo.h"
#include "engine_fast.h"
#include "engine_discard.h"
#include "engine_d2c.h"
@@ -32,6 +33,7 @@ enum ocf_io_if_type {
OCF_IO_WA_IF,
OCF_IO_WI_IF,
OCF_IO_PT_IF,
OCF_IO_WO_IF,
OCF_IO_MAX_IF,
/* Private OCF interfaces */
@@ -68,6 +70,11 @@ static const struct ocf_io_if IO_IFS[OCF_IO_PRIV_MAX_IF] = {
.write = ocf_write_wi,
.name = "Pass Through",
},
[OCF_IO_WO_IF] = {
.read = ocf_read_wo,
.write = ocf_write_wb,
.name = "Write Only",
},
[OCF_IO_FAST_IF] = {
.read = ocf_read_fast,
.write = ocf_write_fast,
@@ -95,6 +102,7 @@ static const struct ocf_io_if *cache_mode_io_if_map[ocf_req_cache_mode_max] = {
[ocf_req_cache_mode_wb] = &IO_IFS[OCF_IO_WB_IF],
[ocf_req_cache_mode_wa] = &IO_IFS[OCF_IO_WA_IF],
[ocf_req_cache_mode_wi] = &IO_IFS[OCF_IO_WI_IF],
[ocf_req_cache_mode_wo] = &IO_IFS[OCF_IO_WO_IF],
[ocf_req_cache_mode_pt] = &IO_IFS[OCF_IO_PT_IF],
[ocf_req_cache_mode_fast] = &IO_IFS[OCF_IO_FAST_IF],
[ocf_req_cache_mode_d2c] = &IO_IFS[OCF_IO_D2C_IF],