nvme: add NVME_SC_CANCELLED
To properly document how we are using a negative Linux error value to
communicate request cancellations inside the driver.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index b75d41e..88950f36 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -19,6 +19,16 @@
#include <linux/kref.h>
#include <linux/blk-mq.h>
+enum {
+ /*
+ * Driver internal status code for commands that were cancelled due
+ * to timeouts or controller shutdown. The value is negative so
+ * that it a) doesn't overlap with the unsigned hardware error codes,
+ * and b) can easily be tested for.
+ */
+ NVME_SC_CANCELLED = -EINTR,
+};
+
extern unsigned char nvme_io_timeout;
#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 99c5b63..e683bd1 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -621,7 +621,7 @@
if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
if (cmd_rq->ctx == CMD_CTX_CANCELLED)
- error = -EINTR;
+ error = NVME_SC_CANCELLED;
else
error = status;
} else {