It's intended to be used in a context, where cache is not initialized
and the io_queue is not available yet.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
struct ocf_io is going to be removed soon (consolidated with ocf_request).
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
Skip the ocf_io abstraction and get the data directly from the request.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
This is meant to be used in atomic mode to avoid allocating huge buffers
for zeroing data on drive.
Signed-off-by: Robert Baldyga <robert.baldyga@huawei.com>
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>
Allow the core volume IOs to be forwarded directly to backend volumes to
avoid unnecessary allocations.
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>
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>
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>
With a high dirty ratio and occupancy, OCF might unable to map cache lines
for new requests, thus pass-through the I/O to core devices. IOPS will
drop afterwards. We need to control the dirty ratio.
Existing `alru' policy gives user the chance to control the stale buffer
time, activity threshold etc. They can affect the dirty ratio of the cache
device, but in an empirical manner, more or less. Introducing
`max_dirty_ratio' can make it explicit.
At first glance, it might be better to implement a dedicated cleaner policy
directly targeting dirty ratio goal, so that the `alru' parameters remains
orthogonal. But one the other hand, we still need to flush dirty cache
lines periodically, instead of just keeping a watermark of dirty ratio.
It indicates that existing `alru' parameters are still required if we
develop a new policy, and it seems reasonable to make it a parameter.
To sum up, this patch does the following:
- added a 'max_dirty_ratio' parameter with default value 100;
- with default value 100, `alru' cleaner is identical to what is was;
- with value N less than 100, the cleaner (when waken up) will active
brought dirty ratio to N, regardless of staleness time.
Signed-off-by: David Lee <live4thee@gmail.com>
It makes it possible to attach/load cache using volume types that have
non-standard constructors.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
This allows to avoid allocating cleaner metadata section and effectively
save up to 20% of metadata memory footprint.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
First try to clean only the mapping. This operation does not require any
rollback, so even if flushing collision fails, core object is still
intact. In case of error we inform user that core was not removed by
returning new error code (-OCF_ERR_CORE_NOT_REMOVED).
After flushing collision succeeds we remove core from metadata and
flush superblock at the end. At that point the core is fully removed
from OCF and even if superblock flush error occurs there is nothing we
can do about it, so we just return the error code.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
This function must be fixed to work with metadata flapping. Until then
mark as not supported
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Signed-off-by: Krzysztof Majzerowicz-Jaszcz <krzysztof.majzerowicz-jaszcz@intel.com>
Linux includes its own stdarg.h file since version 5.15. This change
allows ocf library to compile as part of a kernel module.
Signed-off-by: Gal Hammer <gal.hammer@huawei.com>
Signed-off-by: Shai Fultheim <shai.fultheim@huawei.com>
