linux-kernel - [PATCH 2/2] block: Add blk_status_to

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Date:   Mon, 19 Oct 2020 15:02:41 -0400
From:   Kent Overstreet <kent.overstreet@...il.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        axboe@...nel.dk
Cc:     Kent Overstreet <kent.overstreet@...il.com>
Subject: [PATCH 2/2] block: Add blk_status_to_str()

If we're going to the trouble of having these nice error strings, let's
make them available.

Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
---
 block/blk-core.c       | 13 +++++++++----
 include/linux/blkdev.h |  1 +
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 10c08ac506..d68f24a7ee 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -213,18 +213,23 @@ int blk_status_to_errno(blk_status_t status)
 }
 EXPORT_SYMBOL_GPL(blk_status_to_errno);
 
-static void print_req_error(struct request *req, blk_status_t status,
-		const char *caller)
+const char *blk_status_to_str(blk_status_t status)
 {
 	int idx = (__force int)status;
 
 	if (WARN_ON_ONCE(idx >= ARRAY_SIZE(blk_errors)))
-		return;
+		return "(invalid error)";
+	return blk_errors[idx].name;
+}
+EXPORT_SYMBOL_GPL(blk_status_to_str);
 
+static void print_req_error(struct request *req, blk_status_t status,
+		const char *caller)
+{
 	printk_ratelimited(KERN_ERR
 		"%s: %s error, dev %s, sector %llu op 0x%x:(%s) flags 0x%x "
 		"phys_seg %u prio class %u\n",
-		caller, blk_errors[idx].name,
+		caller, blk_status_to_str(status),
 		req->rq_disk ? req->rq_disk->disk_name : "?",
 		blk_rq_pos(req), req_op(req), blk_op_str(req_op(req)),
 		req->cmd_flags & ~REQ_OP_MASK,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 868e11face..d9e3b7b017 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -936,6 +936,7 @@ extern const char *blk_op_str(unsigned int op);
 
 int blk_status_to_errno(blk_status_t status);
 blk_status_t errno_to_blk_status(int errno);
+const char *blk_status_to_str(blk_status_t status);
 
 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
 
-- 
2.28.0