This patch provides a common decoder for block status path related errors
that may be retried so various entities wishing to consult this do not
have to duplicate this decision.
Acked-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
#define BLK_STS_AGAIN ((__force blk_status_t)12)
+/**
+ * blk_path_error - returns true if error may be path related
+ * @error: status the request was completed with
+ *
+ * Description:
+ * This classifies block error status into non-retryable errors and ones
+ * that may be successful if retried on a failover path.
+ *
+ * Return:
+ * %false - retrying failover path will not help
+ * %true - may succeed if retried
+ */
+static inline bool blk_path_error(blk_status_t error)
+{
+ switch (error) {
+ case BLK_STS_NOTSUPP:
+ case BLK_STS_NOSPC:
+ case BLK_STS_TARGET:
+ case BLK_STS_NEXUS:
+ case BLK_STS_MEDIUM:
+ case BLK_STS_PROTECTION:
+ return false;
+ }
+
+ /* Anything else could be a path failure, so should be retried */
+ return true;
+}
+
struct blk_issue_stat {
u64 stat;
};