null_blk: reset cache state before device setup

The CACHE flag belongs to nullb_device, which outlives each powered-on
nullb instance. Power-off discards the runtime cache but leaves the flag
set. If cache_size changes from 1 to 0 before the next power-on, the
queue advertises write-through while new page writes still go into the
cache tree. A completed write can then disappear at the next power-off.

Clear CACHE before creating the new instance. The existing cache_size
setup sets it again when the new instance needs a cache.

Signed-off-by: Baek Kyu, Kim <pocj8ur4in@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20261025161133.59344-1-pocj8ur4in@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions