block: replace bi_bdev with a gendisk pointer and partitions index
This way we don't need a block_device structure to submit I/O. The block_device has different life time rules from the gendisk and request_queue and is usually only available when the block device node is open. Other callers need to explicitly create one (e.g. the lightnvm passthrough code, or the new nvme multipathing code). For the actual I/O path all that we need is the gendisk, which exists once per block device. But given that the block layer also does partition remapping we additionally need a partition index, which is used for said remapping in generic_make_request. Note that all the block drivers generally want request_queue or sometimes the gendisk, so this removes a layer of indirection all over the stack. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Jens Axboe

parent
c2ee070fb0
commit
74d46992e0
@@ -494,6 +494,24 @@ extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
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extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
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extern unsigned int bvec_nr_vecs(unsigned short idx);
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#define bio_set_dev(bio, bdev) \
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do { \
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(bio)->bi_disk = (bdev)->bd_disk; \
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(bio)->bi_partno = (bdev)->bd_partno; \
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} while (0)
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#define bio_copy_dev(dst, src) \
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do { \
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(dst)->bi_disk = (src)->bi_disk; \
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(dst)->bi_partno = (src)->bi_partno; \
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} while (0)
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#define bio_dev(bio) \
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disk_devt((bio)->bi_disk)
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#define bio_devname(bio, buf) \
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__bdevname(bio_dev(bio), (buf))
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#ifdef CONFIG_BLK_CGROUP
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int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
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int bio_associate_current(struct bio *bio);
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