block: add a "tag" for block status codes

The full name of the status codes is not good for user interfaces as it
can contain white spaces.  Add the name of the status code without the
BLK_STS_ prefix as a tag so that it can be used for user interfaces.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Md Haris Iqbal <haris.iqbal@linux.dev>
Link: https://patch.msgid.link/20260611140703.2401204-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-core.c b/block/blk-core.c
index 43121a9f99f009576f16d1ecc0d2145f2aa0b040..842b5c6f2fb4537e890f7ff0d1880f1e9990a5df 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -135,10 +135,12 @@ EXPORT_SYMBOL_GPL(blk_op_str);
 #define ENT(_tag, _errno, _desc)       \
 [BLK_STS_##_tag] = {                           \
        .errno          = _errno,               \
+       .tag            = __stringify(_tag),    \
        .name           = _desc,                \
 }
 static const struct {
        int             errno;
+       const char      *tag;
        const char      *name;
 } blk_errors[] = {
        ENT(OK,                 0,              ""),
@@ -203,6 +205,32 @@ const char *blk_status_to_str(blk_status_t status)
        return blk_errors[idx].name;
 }
 
+const char *blk_status_to_tag(blk_status_t status)
+{
+       int idx = (__force int)status;
+
+       if (WARN_ON_ONCE(idx >= ARRAY_SIZE(blk_errors) || !blk_errors[idx].tag))
+               return "<null>";
+       return blk_errors[idx].tag;
+}
+
+blk_status_t tag_to_blk_status(const char *tag)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(blk_errors); i++) {
+               if (blk_errors[i].tag &&
+                   !strcmp(blk_errors[i].tag, tag))
+                       return (__force blk_status_t)i;
+       }
+
+       /*
+        * Return BLK_STS_OK for mismatches as this function is intended to
+        * parse error status values.
+        */
+       return BLK_STS_OK;
+}
+
 /**
  * blk_sync_queue - cancel any pending callbacks on a queue
  * @q: the queue

diff --git a/block/blk.h b/block/blk.h
index 7fdfb9012ce1b392f0ad256a6c6fc5cacd1273c2..3ab2cdd6ed12074cf21b05864b998d5697e514e5 100644 (file)
--- a/block/blk.h
+++ b/block/blk.h
@@ -51,6 +51,8 @@ struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
 void blk_free_flush_queue(struct blk_flush_queue *q);
 
 const char *blk_status_to_str(blk_status_t status);
+const char *blk_status_to_tag(blk_status_t status);
+blk_status_t tag_to_blk_status(const char *tag);
 
 bool __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
 bool blk_queue_start_drain(struct request_queue *q);