Add a helper to stringify the zone conditions. We use this helper in the
next patch to track zone conditions in tracepoints.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
---
Changes from V1 : -
1. Move blk_zone_cond_str() to blk-zoned.c.
2. Mark zone_cond_namd array static.
3. Remove BLK_ZONE_COND_LAST.
4. Get rid of inline prefix for blk_zone_cond_str().
---
block/blk-zoned.c | 32 ++++++++++++++++++++++++++++++++
include/linux/blkdev.h | 10 ++++++++++
2 files changed, 42 insertions(+)
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 053ea4b51988..a40a3a27bfbc 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -887,6 +887,16 @@ extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
/* Helper to convert REQ_OP_XXX to its string format XXX */
extern const char *blk_op_str(unsigned int op);
+#ifdef CONFIG_BLK_DEV_ZONED
+/* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
+extern const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
+#else
+static const char *blk_zone_cond_str(unsigned int zone_cond)
+{
+ return "NOT SUPPORTED";
+}
+#endif /* CONFIG_BLK_DEV_ZONED */
+
int blk_status_to_errno(blk_status_t status);
blk_status_t errno_to_blk_status(int errno);
--
2.22.1
