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blk-zoned: Improve the queue reference count strategy documentation 

For the blk_queue_exit() calls, document where the corresponding code can
be found that increases q->q_usage_counter.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20241217210310.645966-4-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2024-12-17 13:03:09 -08:00 committed by Jens Axboe
parent cbac56e523
commit fa8555630b
1 changed files with 2 additions and 4 deletions
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6
block/blk-zoned.c
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@ -582,6 +582,7 @@ static inline void blk_zone_wplug_bio_io_error(struct blk_zone_wplug *zwplug,
bio_clear_flag(bio, BIO_ZONE_WRITE_PLUGGING);
bio_io_error(bio);
disk_put_zone_wplug(zwplug);
/* Drop the reference taken by disk_zone_wplug_add_bio(() */
blk_queue_exit(q);
}
@ -893,10 +894,7 @@ void blk_zone_write_plug_init_request(struct request *req)
break;
}
/*
* Drop the extra reference on the queue usage we got when
* plugging the BIO and advance the write pointer offset.
*/
/* Drop the reference taken by disk_zone_wplug_add_bio(). */
blk_queue_exit(q);
zwplug->wp_offset += bio_sectors(bio);