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-rw-r--r--include/linux/blk_types.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index c007d58d2703..a24d4078fb21 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -105,6 +105,10 @@ typedef u16 blk_short_t;
/* hack for device mapper, don't use elsewhere: */
#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
+/*
+ * BLK_STS_AGAIN should only be returned if RQF_NOWAIT is set
+ * and the bio would block (cf bio_wouldblock_error())
+ */
#define BLK_STS_AGAIN ((__force blk_status_t)12)
/*