We have two functions that accept algo= and priority= params -
algorithm_params_store() and recompress_store(). This patch unifies and
hardens handling of those parameters.
There are 4 possible cases:
- only priority= provided [recommended]
We need to verify that provided priority value is
within permitted range for each particular function.
- both algo= and priority= provided
We cannot prioritize one over another. All we should
do is to verify that zram is configured in the way
that user-space expects it to be. Namely that zram
indeed has compressor algo= setup at given priority=.
- only algo= provided [not recommended]
We should lookup priority in compressors list.
- none provided [not recommended]
Just use function's defaults.
Link: https://lkml.kernel.org/r/20260311084312.1766036-7-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Suggested-by: Minchan Kim <minchan@kernel.org>
Cc: Brian Geffon <bgeffon@google.com>
Cc: gao xu <gaoxu2@honor.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
301f392200