[PATCH v2 1/2] block: define new rqf_flags RQF_XFER_SINGLE_BLK

[Bin Liu <b-liu@ti.com>]

This new flag will be used to handle multi-block transfer failure, in
which case single-block transfer will be used.

Signed-off-by: Bin Liu <b-liu@ti.com>
---
v2: new patch, separate the new flag definition.

 block/blk-mq-debugfs.c | 1 +
 include/linux/blk-mq.h | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 28167c9baa55..5f97d07fa3c8 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -243,6 +243,7 @@ static const char *const rqf_name[] = {
 	RQF_NAME(ZONE_WRITE_PLUGGING),
 	RQF_NAME(TIMED_OUT),
 	RQF_NAME(RESV),
+	RQF_NAME(XFER_SINGLE_BLK),
 };
 #undef RQF_NAME
 
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 18a2388ba581..06b6e1c4fca3 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -64,6 +64,7 @@ enum rqf_flags {
 	/* ->timeout has been called, don't expire again */
 	__RQF_TIMED_OUT,
 	__RQF_RESV,
+	__RQF_XFER_SINGLE_BLK,
 	__RQF_BITS
 };
 
@@ -85,6 +86,8 @@ enum rqf_flags {
 			((__force req_flags_t)(1 << __RQF_ZONE_WRITE_PLUGGING))
 #define RQF_TIMED_OUT		((__force req_flags_t)(1 << __RQF_TIMED_OUT))
 #define RQF_RESV		((__force req_flags_t)(1 << __RQF_RESV))
+#define RQF_XFER_SINGLE_BLK	\
+			((__force req_flags_t)(1 << __RQF_XFER_SINGLE_BLK))
 
 /* flags that prevent us from merging requests: */
 #define RQF_NOMERGE_FLAGS \
-- 
2.34.1