diff options
authorChaitanya Kulkarni <>2021-06-09 18:32:48 -0700
committerChristoph Hellwig <>2021-06-17 15:51:20 +0200
commitc28a61471c5898e832c6e8634b2659249761b833 (patch)
parent7860569ad47f9fbd7c9f93a5c2b7d2a18e4af831 (diff)
block: export blk_next_bio()
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 <> Signed-off-by: Chaitanya Kulkarni <> Signed-off-by: Christoph Hellwig <>
2 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 7b256131b20b..9f09beadcbe3 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -21,6 +21,7 @@ struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp)
return new;
int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, int flags,
diff --git a/include/linux/bio.h b/include/linux/bio.h
index a0b4cfdf62a4..b2491ead22a0 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -822,4 +822,6 @@ static inline void bio_set_polled(struct bio *bio, struct kiocb *kiocb)
bio->bi_opf |= REQ_NOWAIT;
+struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);
#endif /* __LINUX_BIO_H */