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block: add a bdev_write_cache helper

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Add a helper to check the write cache flag based on the block_device
instead of having to poke into the block layer internal request_queue.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-13-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-04-15 06:52:43 +02:00 • committed by Jens Axboe
parent 10f0d2a517
commit 08e688fdb8
5 changed files with 10 additions and 10 deletions
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5
include/linux/blkdev.h
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@ -1331,6 +1331,11 @@ static inline bool bdev_nonrot(struct block_device *bdev)
return blk_queue_nonrot(bdev_get_queue(bdev));
}
static inline bool bdev_write_cache(struct block_device *bdev)
{
return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
}
static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
{
struct request_queue *q = bdev_get_queue(bdev);