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Extend CAS interface with Write-only cache mode

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Write-only (WO) cache mode is similar to Write-back (WB), 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.

Write-only cache mode is behaving similarly to Write-back with
respect to flushing dirty data. For example it is required to
explicitly enable/disable flushing when changing cache mode
from WO to something other than WB.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski
2019-06-07 15:10:11 -04:00
parent a9eb0ee705
commit ffa1f4b067
7 changed files with 31 additions and 18 deletions
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16
casadm/cas_lib.h
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@@ -125,15 +125,15 @@ int start_cache(ocf_cache_id_t cache_id, unsigned int cache_init,
int stop_cache(ocf_cache_id_t cache_id, int flush);
#ifdef WI_AVAILABLE
#define CAS_CLI_HELP_START_CACHE_MODES "wt|wb|wa|pt|wi"
#define CAS_CLI_HELP_SET_CACHE_MODES "wt|wb|wa|pt|wi"
#define CAS_CLI_HELP_SET_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through, Write-Invalidate"
#define CAS_CLI_HELP_START_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through, Write-Invalidate"
#define CAS_CLI_HELP_START_CACHE_MODES "wt|wb|wa|pt|wi|wo"
#define CAS_CLI_HELP_SET_CACHE_MODES "wt|wb|wa|pt|wi|wo"
#define CAS_CLI_HELP_SET_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through, Write-Invalidate, Write-Only"
#define CAS_CLI_HELP_START_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through, Write-Invalidate, Write-Only"
#else
#define CAS_CLI_HELP_START_CACHE_MODES "wt|wb|wa|pt"
#define CAS_CLI_HELP_SET_CACHE_MODES "wt|wb|wa|pt"
#define CAS_CLI_HELP_START_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through"
#define CAS_CLI_HELP_SET_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through"
#define CAS_CLI_HELP_START_CACHE_MODES "wt|wb|wa|pt|wo"
#define CAS_CLI_HELP_SET_CACHE_MODES "wt|wb|wa|pt|wo"
#define CAS_CLI_HELP_START_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through, Write-Only"
#define CAS_CLI_HELP_SET_CACHE_MODES_FULL "Write-Through, Write-Back, Write-Around, Pass-Through, Write-Only"
#endif
/**