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[7/7] lightnvm: rrpc: split bios of size > 256kb

Message ID 1477579783-5289-7-git-send-email-javier@cnexlabs.com (mailing list archive)
State New, archived
Headers show

Commit Message

=?UTF-8?q?Javier=20Gonz=C3=A1lez?= Oct. 27, 2016, 2:49 p.m. UTC 
rrpc cannot handle bios of size > 256kb due to NVME's 64 bit completion
bitmap. If a larger bio comes, split it explicitly.

Signed-off-by: Javier González <javier@cnexlabs.com>
---
 drivers/lightnvm/rrpc.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index 8deef2e..0b8251f 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -984,6 +984,12 @@  static blk_qc_t rrpc_make_rq(struct request_queue *q, struct bio *bio)
 	struct nvm_rq *rqd;
 	int err;
 
+	/*
+	 * Multipage is supported up until 256kb due to NVME's 64 bit completion
+	 * bitmap.
+	 */
+	blk_queue_split(q, &bio, q->bio_split);
+
 	if (bio_op(bio) == REQ_OP_DISCARD) {
 		rrpc_discard(rrpc, bio);
 		return BLK_QC_T_NONE;