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block: export blk_next_bio()

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The block layer provides emulation of zone management operations
targeting all zones of a zoned block device only for the zone reset
operation (REQ_OP_ZONE_RESET). In order to correctly implement
exporting of zoned block devices with NVMeOF, emulating zone management
operations targeting all zones of a device is also necessary for the
open, close and finish zone operations (REQ_OP_ZONE_OPEN,
REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH).

Instead of duplicating the code, export the existing helper from block
layer so we can use a bio chaining pattern that is present in the block
layer for REQ_OP_ZONE RESET all emulation in the NVMeOF zoned block
device backend.

Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni 2021-06-09 18:32:48 -07:00 committed by Christoph Hellwig
parent 7860569ad4
commit c28a61471c
2 changed files with 3 additions and 0 deletions
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1
block/blk-lib.c
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@ -21,6 +21,7 @@ struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp)
return new; return new;
} }
EXPORT_SYMBOL_GPL(blk_next_bio);
int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, int flags, sector_t nr_sects, gfp_t gfp_mask, int flags,

2
include/linux/bio.h
View File

@ -822,4 +822,6 @@ static inline void bio_set_polled(struct bio *bio, struct kiocb *kiocb)
bio->bi_opf |= REQ_NOWAIT; bio->bi_opf |= REQ_NOWAIT;
} }
struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
#endif /* __LINUX_BIO_H */ #endif /* __LINUX_BIO_H */