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block: Improve blk_zone_write_plug_bio_merged()
Improve blk_zone_write_plug_bio_merged() to check that we succefully get a reference on the zone write plug of the merged BIO, as expected since for a merge we already have at least one request and one BIO referencing the zone write plug. Comments in this function are also improved to better explain the references to the BIO zone write plug. Signed-off-by: Damien Le Moal <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Reviewed-by: Johannes Thumshirn <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
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