Ignore the interruption of the stop operation - will finish asynchronously.
Remove redundant `ocf_queue_put`.
Move creating the `finish_thread` during the cache stop
from the `_cache_mngt_cache_stop_sync` to the `cache_mngt_exit_instance`
and give it a proper handling.
Signed-off-by: Slawomir Jankowski <slawomir.jankowski@intel.com>
This method produced too optimistic free memory value, which in result
led to oom killer activation. This patch restores more conservative
free memory calculation method.
This reverts commit 1e9b7a4262.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
Since kernel 5.7 kallsyms_on_each_symbol() is not available.
NOTE: This affects ability to perform upgrade in flight on kernels 5.7+.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
This counter is not accurate (missing required memory barrier
to avoid unwanted behavior due to processor optimizations)
and performance gain is not clear - generally global
atomic variables are something we would like to avoid
going forward.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Since commit 8b3238cabd50e27 in linux kernel removed blk_bidi_rq() marco, it
has to be wrapped in CAS `configure` script
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Since there is no kernel-kernel api available to communicate
with nvme driver it is more convenient to use some nvme-dedicated
software (e.g. nvme-cli) to manage nvme devices.
It is even not possible to format nvme device with CAS using current
implementation on newest kernels.
Signed-off-by: Michal Rakowski <michal.rakowski@intel.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
To avoid logging the same message each time _cache_mngt_create_exported_object()
is called, print error message within it.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
To avoid logging the same message each time block_dev_activate_exported_object()
is called, print error message within it.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
In case of error `blk_mq_init_queue()` does not return NULL, but
`ERR_PTR(error_code)` instead.
`IS_ERR_OR_NULL()` should be used to check if `blk_mq_init_queue()` actually
failed.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
If cache is restored after upgrade, NULL is passed instead of
`struct kcas_start_cache`. This leads to null pointer dereference.
To prevent null pointer dereference, `struct kcas_start_cache` is tested before
each use
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
If cache is initialized successfully, `struct _cache_mngt_attach_context` might
be freed in `cache_mngt_init_instance()`. In such case pointer to rollback
thread can't be accessed and thread can't be stopped.
To prevent such scenario pointer should be kept in separate variable.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Purge invalidates all cache lines which belongs to given core. It is very
usefull feature for tests.
Calling purge is possbile with casadm `--script` swtich.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Purge invalidates all cache lines. It is very usefull feature for tests.
Calling purge is possbile with casadm `--script` swtich.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Sorting can take a long time with big cache sizes and a lot of dirty
data. Make sure we reschedule frome time to time to avoid lockups.
Signed-off-by: Jan Musial <jan.musial@intel.com>
Since stopping threads have to be done synchronusly, there is no need to keep
reference to cas_cache module in each thread.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
This change assures that data array is always optimally aligned.
Additionally item boolean flags are put into the same uint32
as cpu number in order to save space for future additions.
This change fixes ~50% performance degradation introduced by
commit d822a1d1.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
To prevent cache being stopped before async start finialize has finished, stop
routine have to check if worker responsible for finalizing is not running
anymore.
To create link between start finalize and stop functions, work_struct had to be
moved from attach_context to cache_priv.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Read lock allows to retrieve informations about flushing progress and printing
progress bar during changing cache mode.
Flushing dirty data during changing cache mode is done twice - first flush might
be interrupted by user and the second one, called with write lock acquired, is
uninterruptable.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
To make cache stop as simple as possibe and to reduce number of errors, stop
context should be allocated during cache initialize.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
To prevent removing cas_cache module when not all thread were stopped yet, each
of them should keep reference.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
To enable stopping management queue from completion context, last queue_put()
have to be called from separate thread.
After cache is fully deinitialized, thread calls module_put_and_exit() to
prevent scenario when code is still executed, but there are no references to
module.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
- add a 'pckgen' script to generate various OpenCAS packages like
release archives (tar, zip), RPMs (source and binary) as well as to
create version file with metadata
- add a SPEC file for RPM creation
- add Makefile targets to use 'pckgen' script through 'make <package>'
'pckgen' script has a bunch of features for package generation.
Read './pckgen --help' for more information on usage scenarios.
Script is also prepared to easily add new packages creation in the future.
Signed-off-by: Rafal Stefanowski <rafal.stefanowski@intel.com>
If _cas_create_thread() thread failed, queue should be stopped by ocf. One of steps
done during queue stop is stopping kernel thread.
To avoid stopping thread which is not running, additional check was added in
_cas_stop_thread().
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Right now the classifier is instantiated before device is attached.
This way if we have any IO-classes present on cache device the
classifier will have no knowledge of them and fail to classify IO
correctly.
After moving the classifier init to cache finalization routine we have
all the information needed to initialize properly both in new instance
start path and in load path.
Signed-off-by: Jan Musial <jan.musial@intel.com>
When flushing core, acquiring write lock is not necessary, so it was replaced
with read lock wherever possible.
If flushing operation is interrupted by signal, not only waiting for it to be
finished is interrupted but also OCF flush operation is stopped.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
When flushing cache, acquiring write lock is not necessary, so it was replaced
with read lock wherever possible.
If flushing operation is interrupted by signal, not only waiting for it to be
finished is interrupted but also OCF flush operation is stopped.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
In current OCF cache stop implemetation no error should occur, so there is no
need to handle it in adapter.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
When device used as cache had a big size, it took a lot of time to initialize.
If user would interrupt waiting, asyc OCF init procedure would continue, but
after finish, there was nobody to perfrom kernel part of start nor error
handling.
Now error handling and kernel part of start procedure are moved to completion.
If user will interrupt waiting at any point, newly started cache instance will
be stopped.
Since cache init and load vary only with check for old metadata and initializing
exported objects, they are now merged into one function.
Async cache stop is part of this commit because it was needed for rollback path.
Load, init and stop have common context, because in case of non interrupted
attach CAS needs to wait for rollback to be completed. Common context makes
passing `struct completion` easier between load, init and stop.
This commit is part of patch that will allow to interrupt waiting for OCF
operations.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
When context was allocated on the stack and waiting for completion was
interrupted, completion function would attempt to save flush result in
memory which might in use by other process. This would cause a system crash.
To prevent such scenario, context is allocated dynamiclly and extended with
reference counter. In case of interrupt, completion function doesn't have to
save result in context, it can simply free it's memory.
This commit also enables possibility to interrupt regular flush properly, by
seding SIGING to casadm.
This commit is part of patch that will allow to interrupt waiting for OCF
operations.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
When context was allocated on the stack and waiting for completion was
interrupted, completion function would attempt to save flush result in
memory which might in use by other process. This would cause a system crash.
To prevent such scenario, context is allocated dynamiclly and extended with
reference counter. In case of interrupt, completion function doesn't have to
save result in context, it can simply free it's memory.
This commit is part of patch that will allow to interrupt waiting for OCF
operations.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
