Christoph Hellwig 6c6b354914
block: set the zone size in blk_revalidate_disk_zones atomically ...
The current zone revalidation code has a major problem in that it
doesn't update the zone size and q->nr_zones atomically, leading
to a short window where an out of bounds access to the zone arrays
is possible.
To fix this move the setting of the zone size into the crticial
sections blk_revalidate_disk_zones so that it gets updated together
with the zone bitmaps and q->nr_zones. This also slightly simplifies
the caller as it deducts the zone size from the report_zones.
This change also allows to check for a power of two zone size in generic
code.
Reported-by: Hans Holmberg <hans@owltronix.com >
Reviewed-by: Javier González <javier@javigon.com >
Signed-off-by: Christoph Hellwig <hch@lst.de >
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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6c6b354914