linux.git/drivers/lightnvm/pblk-write.c, branch v4.16

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

lightnvm: pblk: allocate bio size more accurately

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

Wait until we know the exact number of ppas to be sent to the device,
before allocating the bio.

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

lightnvm: pblk: put bio on bio completion

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

Simplify put bio by doing it on bio end_io instead of manually putting
it on the completion path.

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

lightnvm: pblk: remove checks on mempool alloc.

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

As part of the mempool audit on pblk, remove unnecessary mempool
allocation checks on mempools.

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

lightnvm: pblk: do not use a mempool for line bitmaps

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

pblk holds two sector bitmaps: one to keep track of the mapped sectors
while the line is active and another one to keep track of the invalid
sectors. The latter is kept during the whole live of the line, until it
is recycled. Since we cannot guarantee forward progress for the mempool
in this case, get rid of the mempool and simply allocate memory through
kmalloc.

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