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authorChristoph Hellwig <hch@lst.de>2017-08-23 19:10:32 +0200
committerJens Axboe <axboe@kernel.dk>2017-08-23 12:49:55 -0600
commit74d46992e0d9dee7f1f376de0d56d31614c8a17a (patch)
tree399c316bb960541135e557bc1765caeec6d00084 /include/linux/bio.h
parentc2ee070fb00365d7841f6661dcdc7fbe6620bdf8 (diff)
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>
Diffstat (limited to 'include/linux/bio.h')
-rw-r--r--include/linux/bio.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 9276788a9b24..a8fe7935332f 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -494,6 +494,24 @@ extern struct bio_vec *bvec_alloc(gfp_t, int, unsigned long *, mempool_t *);
extern void bvec_free(mempool_t *, struct bio_vec *, unsigned int);
extern unsigned int bvec_nr_vecs(unsigned short idx);
+#define bio_set_dev(bio, bdev) \
+do { \
+ (bio)->bi_disk = (bdev)->bd_disk; \
+ (bio)->bi_partno = (bdev)->bd_partno; \
+} while (0)
+
+#define bio_copy_dev(dst, src) \
+do { \
+ (dst)->bi_disk = (src)->bi_disk; \
+ (dst)->bi_partno = (src)->bi_partno; \
+} while (0)
+
+#define bio_dev(bio) \
+ disk_devt((bio)->bi_disk)
+
+#define bio_devname(bio, buf) \
+ __bdevname(bio_dev(bio), (buf))
+
#ifdef CONFIG_BLK_CGROUP
int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css);
int bio_associate_current(struct bio *bio);