The completion callback is called only in the cache stop scenario, after
flushing the metadata
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
During core remove/detach ocf_cleaner_refcnt_freeze was called only
when cache was attached, but ocf_cleaner_refcnt_unfreeze was called
regardless of cache state.
Signed-off-by: Daniel Madej <daniel.madej@huawei.com>
After attaching new cache device handle all the IOs in Pass-Through mode
until all the d2c requests are completed.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
New caches are added to the list at the point where they are already
initialized and no errors are possible at this point, hence list_del() in error
handling is redundant.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
When IO queues are used for parallelized management operations,
e.g. changing cleaning policy, a deadlock may occur due to global
metadata lock interfering with taking request from IO queue,
as they might be run on the same thread. As a workaround using
a management queue specifically for such operations eliminates
this problem.
Signed-off-by: Rafal Stefanowski <rafal.stefanowski@huawei.com>
This avoids unnecessary map allocation and initialization of unused fields of
request structure. It also allows to track thier number separately from
the regular requests
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
Eliminate need to resolve cache based on the queue. This allows to share
the queue between cache instances. The queue still holds pointer to
a cache that owns the queue, but no management or io path relies on the
queue -> cache mapping.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
Management path does not benefit much from mpools, as number of requests
allocated is very small. It's less restrictive (mngt_queue does not have
single-CPU affinity) thus avoiding mpool usage in management path allows
to introduce additional restrictions on mpool, leading to I/O performance
improvement.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
The user is supposed to deinit/destroy it.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
The queues can be created and destroyed dynamically at any point in
the cache lifetime, and this can happen from different execution contexts,
thus there is a need to protect the queue_list with a lock.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
Previously every created queue was added to io_queues list, which
made mngt_queue being used in ocf_parallelize. Change mngt_queue creation
API so that mngt_queue is not added to the list and doesn't have
unnecessary functionalities initialized.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
Now the request can be pushed to a high priority queue (instead of ocf_queue_push_req_front)
and to a low priority queue (instead of ocf_queue_push_req_back).
Both functions were merged into one function (ocf_queue_push_req) and instead of the
allow_sync parameter there is now a flags parameter that can be an OR combination of
OCF_QUEUE_ALLOW_SYNC and OCF_QUEUE_PRIO_HIGH
Signed-off-by: Ian Levine <ian.levine@huawei.com>
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Majority of management operations should be blocked for detached cache,
although adding and removing cores should be possible.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
Stop and cache detach were already sharing contexts implicitly, which allowed
to reuse some functions in both pipelines. However, changing the context structs
could lead to not obvious bugs.
To prevent such errors both methods now share context structure explicitly
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
