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authorChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>2020-03-25 10:49:54 -0700
committerJens Axboe <axboe@kernel.dk>2020-03-27 13:39:09 -0600
commit02694e86356dcf72d39329e52630234ad687e206 (patch)
treefa4d87c8a233e5a9fa6635b5aa450d79135612e0
parent01bb12fce73720f56eefd513bc07a2354a09b31f (diff)
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block: add a zone condition debug helper
Add a helper to stringify the zone conditions. We use this helper in the next patch to track zone conditions in tracepoints. Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/blk-zoned.c32
-rw-r--r--include/linux/blkdev.h4
2 files changed, 36 insertions, 0 deletions
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 05741c6f618b..f18f1ee9d71f 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -20,6 +20,38 @@
#include "blk.h"
+#define ZONE_COND_NAME(name) [BLK_ZONE_COND_##name] = #name
+static const char *const zone_cond_name[] = {
+ ZONE_COND_NAME(NOT_WP),
+ ZONE_COND_NAME(EMPTY),
+ ZONE_COND_NAME(IMP_OPEN),
+ ZONE_COND_NAME(EXP_OPEN),
+ ZONE_COND_NAME(CLOSED),
+ ZONE_COND_NAME(READONLY),
+ ZONE_COND_NAME(FULL),
+ ZONE_COND_NAME(OFFLINE),
+};
+#undef ZONE_COND_NAME
+
+/**
+ * blk_zone_cond_str - Return string XXX in BLK_ZONE_COND_XXX.
+ * @zone_cond: BLK_ZONE_COND_XXX.
+ *
+ * Description: Centralize block layer function to convert BLK_ZONE_COND_XXX
+ * into string format. Useful in the debugging and tracing zone conditions. For
+ * invalid BLK_ZONE_COND_XXX it returns string "UNKNOWN".
+ */
+const char *blk_zone_cond_str(enum blk_zone_cond zone_cond)
+{
+ static const char *zone_cond_str = "UNKNOWN";
+
+ if (zone_cond < ARRAY_SIZE(zone_cond_name) && zone_cond_name[zone_cond])
+ zone_cond_str = zone_cond_name[zone_cond];
+
+ return zone_cond_str;
+}
+EXPORT_SYMBOL_GPL(blk_zone_cond_str);
+
static inline sector_t blk_zone_start(struct request_queue *q,
sector_t sector)
{
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f629d40c645c..a5acf17e7d76 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -952,6 +952,10 @@ static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
}
#ifdef CONFIG_BLK_DEV_ZONED
+
+/* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
+const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
+
static inline unsigned int blk_rq_zone_no(struct request *rq)
{
return blk_queue_zone_no(rq->q, blk_rq_pos(rq));