block: switch bios to blk_status_t

Replace bi_error with a new bi_status to allow for a clear conversion.
Note that device mapper overloaded bi_error with a private value, which
we'll have to keep arround at least for now and thus propagate to a
proper blk_status_t value.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/lightnvm/pblk-core.c

@@ -296,8 +296,8 @@ void pblk_flush_writer(struct pblk *pblk)
 		pr_err("pblk: tear down bio failed\n");
 	}
 
-	if (bio->bi_error)
-		pr_err("pblk: flush sync write failed (%u)\n", bio->bi_error);
+	if (bio->bi_status)
+		pr_err("pblk: flush sync write failed (%u)\n", bio->bi_status);
 
 	bio_put(bio);
 }

drivers/lightnvm/pblk-read.c

@@ -114,7 +114,7 @@ static void pblk_end_io_read(struct nvm_rq *rqd)
 		pblk_log_read_err(pblk, rqd);
 #ifdef CONFIG_NVM_DEBUG
 	else
-		WARN_ONCE(bio->bi_error, "pblk: corrupted read error\n");
+		WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n");
 #endif
 
 	if (rqd->nr_ppas > 1)
@@ -123,7 +123,7 @@ static void pblk_end_io_read(struct nvm_rq *rqd)
 	bio_put(bio);
 	if (r_ctx->orig_bio) {
 #ifdef CONFIG_NVM_DEBUG
-		WARN_ONCE(r_ctx->orig_bio->bi_error,
+		WARN_ONCE(r_ctx->orig_bio->bi_status,
 						"pblk: corrupted read bio\n");
 #endif
 		bio_endio(r_ctx->orig_bio);

drivers/lightnvm/pblk-write.c

@@ -186,7 +186,7 @@ static void pblk_end_io_write(struct nvm_rq *rqd)
 	}
 #ifdef CONFIG_NVM_DEBUG
 	else
-		WARN_ONCE(rqd->bio->bi_error, "pblk: corrupted write error\n");
+		WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n");
 #endif
 
 	pblk_complete_write(pblk, rqd, c_ctx);

drivers/lightnvm/rrpc.c

@@ -279,8 +279,8 @@ static void rrpc_end_sync_bio(struct bio *bio)
 {
 	struct completion *waiting = bio->bi_private;
 
-	if (bio->bi_error)
-		pr_err("nvm: gc request failed (%u).\n", bio->bi_error);
+	if (bio->bi_status)
+		pr_err("nvm: gc request failed (%u).\n", bio->bi_status);
 
 	complete(waiting);
 }
@@ -359,7 +359,7 @@ try:
 			goto finished;
 		}
 		wait_for_completion_io(&wait);
-		if (bio->bi_error) {
+		if (bio->bi_status) {
 			rrpc_inflight_laddr_release(rrpc, rqd);
 			goto finished;
 		}
@@ -385,7 +385,7 @@ try:
 		wait_for_completion_io(&wait);
 
 		rrpc_inflight_laddr_release(rrpc, rqd);
-		if (bio->bi_error)
+		if (bio->bi_status)
 			goto finished;
 
 		bio_reset(bio);