block: add configurable error injection

Add a new block error injection interface that allows to inject specific
status code for specific ranges.

Signed-off-by: Christoph Hellwig <hch@lst.de>
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/20260611140703.2401204-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 57e84d59a642..5070851cf924 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -176,6 +176,7 @@ struct gendisk {
 #define GD_SUPPRESS_PART_SCAN		5
 #define GD_OWNS_QUEUE			6
 #define GD_ZONE_APPEND_USED		7
+#define GD_ERROR_INJECT			8
 
 	struct mutex open_mutex;	/* open/close mutex */
 	unsigned open_partitions;	/* number of open partitions */
@@ -227,6 +228,11 @@ struct gendisk {
 	 */
 	struct blk_independent_access_ranges *ia_ranges;
 
+#ifdef CONFIG_BLK_ERROR_INJECTION
+	struct mutex		error_injection_lock;
+	struct list_head	error_injection_list;
+#endif
+
 	struct mutex rqos_state_mutex;	/* rqos state change mutex */
 };