From: Mike Christie <michaelc@xxxxxxxxxxx>
This patch adds REQ_LB_OP_TRANSITION which is a REQ_TYPE_LINUX_BLOCK
type of command. It also adds the error codes which are used by
REQ_LB_OP_TRANSITION to blkdev.h.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
block/ll_rw_blk.c | 2 +-
include/linux/blkdev.h | 41 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 42 insertions(+), 1 deletions(-)
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 6b5173a..c063792 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3396,7 +3396,7 @@ static int __end_that_request_first(stru
* for a REQ_BLOCK_PC request, we want to carry any eventual
* sense key with us all the way through
*/
- if (!blk_pc_request(req))
+ if (!blk_pc_request(req) && !blk_linux_request(req))
req->errors = 0;
if (!uptodate) {
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index db5b00a..e02e208 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -175,8 +175,48 @@ enum {
*/
REQ_LB_OP_EJECT = 0x40, /* eject request */
REQ_LB_OP_FLUSH = 0x41, /* flush device */
+ REQ_LB_OP_TRANSITION = 0x42, /* failover/failback a device */
};
+enum {
+ BLKERR_OK = 0,
+ /*
+ * device errors
+ */
+ BLKERR_DEV_FAILED, /* generic device error */
+ BLKERR_DEV_TEMP_BUSY,
+ BLKERR_DEVICE_MAX, /* max device blkerr definition */
+
+ /*
+ * transport errors
+ */
+ BLKERR_NOTCONN = BLKERR_DEVICE_MAX + 1,
+ BLKERR_CONN_FAILURE,
+ BLKERR_TRANSPORT_MAX, /* max transport blkerr definition */
+
+ /*
+ * driver and generic errors
+ */
+ BLKERR_IO = BLKERR_TRANSPORT_MAX + 1, /* generic error */
+ BLKERR_INVALID_IO,
+ BLKERR_RETRY, /* retry the req, but not immediately */
+ BLKERR_IMM_RETRY, /* immediately retry the req */
+ BLKERR_TIMED_OUT,
+ BLKERR_RES_TEMP_UNAVAIL,
+ BLKERR_DEV_OFFLINED,
+ BLKERR_NOSYS,
+ BLKERR_DRIVER_MAX,
+};
+
+#define blk_dev_err(_err) \
+ (_err > BLKERR_OK && _err < BLKERR_DEVICE_MAX)
+
+ #define blkerr_transport_err(_err) \
+ (_err > BLKERR_DEVICE_MAX && _err < BLKERR_TRANSPORT_MAX)
+
+#define blkerr_driver_err(_err) \
+ (_err > BLKERR_TRANSPORT_MAX)
+
/*
* request type modified bits. first three bits match BIO_RW* bits, important
*/
@@ -529,6 +569,7 @@ #define blk_fs_request(rq) ((rq)->cmd_ty
#define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
#define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL)
#define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE)
+#define blk_linux_request(rq) ((rq)->cmd_type == REQ_TYPE_LINUX_BLOCK)
#define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST)
#define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED)
--
1.4.1.1
--
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