This change introduced a race condition. In some code paths after
cacheline trylock failed, hash bucket lock needed bo be upgraded
in order to obtain asynchronous lock. During hash bucket lock
upgrade, hash read locks were released followed by obtaining
hash write locks. After read locks were released, concurrent
thread could obtain hash bucket locks and modify cacheline
state. The thread upgrading hash bucket lock would need to
repeat traversation in order to safely continue.
This reverts commit 30f22d4f47.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Since we do not expect that incrementing cache's reference counter
during cache init will fail at any condition it is can be changed
to an assert instead of error handling.
Signed-off-by: Michal Rakowski <michal.rakowski@intel.com>
pointer type to array which is 32 characters long;
**core.py**: Add missing import and modify class' field type
to keep consistency;
**ocf_mngt_core**: Remove local variable 'name';
remove env_vmalloc for 'name' - isn't no longer needed;
remove initialization 'name' - as above;
remove env_vfree for context->cfg.name - variable isn't no allocated
in memory;
check if cfg->name exists;
change label in goto from deleted err_name to the closest err_pipeline.
Signed-off-by: Slawomir_Jankowski <slawomir.jankowski@intel.com>
It allows to modify and retrieve particular PP params event if it isn't active
and store values between cache stop and load.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Cache lock waiters hold cache refcount. Because of that,
if there were some waiters, deinitialization of cache
lock on the last put did never happen and putting the
cache was effectively impossible.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
Cleaning policy callbacks are typically called with hash buckets or
cache lines locked. However cleaning policies maintain structures
which are shared across multiple cache lines (e.g. ALRU list).
Additional synchronization is required for theese structures to
maintain integrity.
ACP already implements hash bucket locks. This patch is adding
ALRU list mutex.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Adding locks to assure partition list consistency. Partition
lists is typically modified under cacheline or hash bucket lock.
This is not sufficient synchronization as adding/removing cacheline
from partition list affects neighbouring cachelines state as well.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Since ocf requires loading cache with the same name as it was stopped, it should
also allow to read name from metadata.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
This change allows to check if specified cache name name is unique. To prevent
adding cache instance with the same name, context lock is acquired until name
isn't set.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Adding synchronization around metadata collision segment pages.
This part of metadata is modified when cacheline is mapped/unmapped
and when dirty status changes.
Synchronization on page level is required on top of cacheline
and hash bucket locks to assure metadata flush always reads
consistent state when copying entire collision table memory
page.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Modifying _ocf_mngt_io_class_configure and _ocf_mngt_io_class_remove
to never return -OCF_ERR_IO_CLASS_NOT_EXIST error code. This
return code was ignored by the caller anyway. In _ocf_mngt_io_class_remove
-OCF_ERR_IO_CLASS_NOT_EXIST indicated the IO class is already
removed, which is not an error. In _ocf_mngt_io_class_configure
-OCF_ERR_IO_CLASS_NOT_EXIST indicated empty IO class name, which
is actualy invalid input. This change made it possible to remove
erroneous error handling for -OCF_ERR_IO_CLASS_NOT_EXIST case in
ocf_mngt_cache_io_classes_configure.
This change fixes IO class configuration.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
When loading cache metadata, it should be started with exactly the same name as
it was running previously. Otherwise load should fail and return newly added
error code.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
