there is an issue when someone call to parallelize/pipeline
with some struct that is aligned (say to 64B)
but these APIs add their own data, right before
the user's private data.
so, the user's data is no longer aligned
which might cause segfault in some cases.
Signed-off-by: Amir Haroush <amir.haroush@huawei.com>
Signed-off-by: Shai Fultheim <shai.fultheim@huawei.com>
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
Because context has one field which is aligned to 64B
(struct ocf_volume cache_volume) the compiler use vmovdqa (aligned)
instead of vmovdqu (unaligned) in reality the address is not 64 aligned,
it ends with 0x8, so we get this segfault.
Signed-off-by: Amir Haroush <amir.haroush@huawei.com>
Signed-off-by: Shai Fultheim <shai.fultheim@huawei.com>
Signed-off-by: Robert Baldyga <robert.baldyga@intel.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>
Don't populate cleaning policies during initialization procedure so the user
has to call the latter explicitly.
Until now cleaning policies could be populated in two ways:
- implicitly during cleaning policy initialization,
- explicitly be calling populate.
The difference was that the former was single threaded.
This patch removes the functionally redundant and less efficient code.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
The function not only recovers cleaning policy metadata but is also utilized
to initialize data structures so more generic name is actually more accurate
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Initializing metadata in an asynchronous manner will allow to use
parallelization utilities in the future commits
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Normally cleaning policy would be deinitialized during stopping cache which is
one of steps of error handling e.g in case of failed cache activation. But since
`cache_stop()` may be called only for an attached cache instance, cleaning
policy needs to deinitialized explicitly.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
Remove one callback indirection level. I/O never changes it's direction
so there is no point in storing both read and write callbacks for each
request.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
In most (6/9) instances across engines ocf_core_stats_cache_error_update
is called upon each cache volume I/O error, possibly multiple times
per a user request in case of multi-cacheline requests. Backfill,
fast and read engine are exceptions, incrementing error stats only
once per user request.
This commit unifies ocf_core_stats_cache_error_update usage so that
in all the engines error statistic is incremented for once for every
error.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
It is wastefull to allocate a full 1B to store 1 bit of
alock status per cacheline. Fixed allocation of 128 bits
seems more reasonable.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
1. On 1 bit per cacheline is required for the status
2. ... however the size must be 8B aligned
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Metadata capacity reported by dmesg was actually a memory footprint.
A proper size of metadata is now reported.
Signed-off-by: Krzysztof Majzerowicz-Jaszcz <krzysztof.majzerowicz-jaszcz@intel.com>
Optional uuid parameter to ocf_volume_init() points to UUID object
initialized by the user. We should verify it is not excesively large
as we attempt to allocate a buffer to store a copy of the UUID.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
The proper way to avoid calling on_deinit() callback on an already
deinitialized volume is to deinitialize type callbacks, as it is done
in the previous commit.
This reverts commit a7f70687a9.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
After deinitialization of volume there is no need to call back to
type ops. Currently we would erroneously call on_deinit() callback
multiple times if ocf_volume_deinit() is performed more than once,
which we expect to happen and treat as a correct use of API.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
ocf_metadata_flush_superblock() is being called on the cache stop, after
deinitialization of the cores (and their volumes), thus accessing core
volume in superblock flushing procedure leads to use-after-free bug.
Fix this by moving volume type setting to the core insertion code.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
After moving from a volume, it's priv is assigned to the new owner.
Destroying the volume after moving from it must not attempt to use the
priv, especially not to attempt to deinit member volumes in case of
composite volume.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
Volumes are now exposed in OCF API and we should gracefully handle
attempt to open already opened volume (instead of ENV_BUG).
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.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>
Flush I/O should be forwarded to core and cache device. In case of core
this is simple - just mirror the I/O from the top volume. Since
cache data is owned by OCF it makes sense to send a simple flush I/O
with 0 address and size.
Current implementation attempts to use cache data I/O interface
(ocf_submit_cache_reqs function) instead of submitting empty flush to
the underlying cache device. This function is designed to read/write
from mapped cachelines while there is no traversation/mapping
performed on flush I/O.
If request map allocation succeeds, this results in sending I/O to
addres 0 with size and flags inherited from the top adapter I/O.
This doesn't make any sense, and can even result in invalid I/O if the
size is greater than cache device size.
Even worse, if flush request map allocation fails (which happens
always in case of large flush requests) then the erroneous call to
ocf_submit_cache_reqs results in NULL pointer dereference.
Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
