linux.git/drivers/lightnvm/pblk-write.c, branch v4.18

lightnvm: pblk: garbage collect lines with failed writes

2018-06-01T15:02:53+00:00

Write failures should not happen under normal circumstances,
so in order to bring the chunk back into a known state as soon
as possible, evacuate all the valid data out of the line and let the
fw judge if the block can be written to in the next reset cycle.

Do this by introducing a new gc list for lines with failed writes,
and ensure that the rate limiter allocates a small portion of
the write bandwidth to get the job done.

The lba list is saved in memory for use during gc as we
cannot gurantee that the emeta data is readable if a write
error occurred.

Signed-off-by: Hans Holmberg 
Reviewed-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: pblk: rework write error recovery path

2018-06-01T15:02:53+00:00

The write error recovery path is incomplete, so rework
the write error recovery handling to do resubmits directly
from the write buffer.

When a write error occurs, the remaining sectors in the chunk are
mapped out and invalidated and the request inserted in a resubmit list.

The writer thread checks if there are any requests to resubmit,
scans and invalidates any lbas that have been overwritten by later
writes and resubmits the failed entries.

Signed-off-by: Hans Holmberg 
Reviewed-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: convert to bioset_init()/mempool_init()

2018-05-30T21:33:32+00:00

Convert lightnvm to embedded bio sets.

Reviewed-by: Javier González 
Signed-off-by: Kent Overstreet 
Signed-off-by: Jens Axboe

lightnvm: simplify geometry structure

2018-03-29T23:29:09+00:00

Currently, the device geometry is stored redundantly in the nvm_id and
nvm_geo structures at a device level. Moreover, when instantiating
targets on a specific number of LUNs, these structures are replicated
and manually modified to fit the instance channel and LUN partitioning.

Instead, create a generic geometry around nvm_geo, which can be used by
(i) the underlying device to describe the geometry of the whole device,
and (ii) instances to describe their geometry independently.

Signed-off-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: pblk: clear flush point on completed writes

2018-01-05T15:50:12+00:00

Move completion of syncs and clearing of flush points to the
write completion path - this ensures that the data has been
comitted to the media before completing bios containing syncs.

Signed-off-by: Hans Holmberg 
Signed-off-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: pblk: rename sync_point to flush_point

2018-01-05T15:50:12+00:00

Sync point is a really confusing name for keeping track of
the last entry that needs to be flushed so change the name
to to flush_point instead.

Signed-off-by: Hans Holmberg 
Signed-off-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: use internal pblk methods

2018-01-05T15:50:12+00:00

Now that rrpc has been removed, the only users of the ppa helpers
is pblk. However, pblk already defines similar functions.

Switch pblk to use the internal ones, and remove the generic ppa
helpers.

Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: pblk: remove I/O dependency on write path

2017-10-13T14:34:57+00:00

pblk schedules user I/O, metadata I/O and erases on the write path in
order to minimize collisions at the media level. Until now, there has
been a dependency between user and metadata I/Os that could lead to a
deadlock as both take the per-LUN semaphore to schedule submission.

This path removes this dependency and guarantees forward progress at a
per I/O granurality.

Signed-off-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: pblk: refactor rqd alloc/free

2017-10-13T14:34:57+00:00

Refactor the rqd allocation and free functions so that all I/O types can
use these helper functions.

Signed-off-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe

lightnvm: pblk: improve naming for internal req.

2017-10-13T14:34:57+00:00

Each request type sent to the LightNVM subsystem requires different
metadata. Until now, we have tailored this metadata based on write, read
and erase commands. However, pblk uses different metadata for internal
writes that do not hit the write buffer. Instead of abusing the metadata
for reads, create a new request type - internal write to improve
code readability.

In the process, create internal values for each I/O type instead of
abusing the READ/WRITE macros, as suggested by Christoph.

Signed-off-by: Javier González 
Signed-off-by: Matias Bjørling 
Signed-off-by: Jens Axboe