Commit e02ab023 authored Apr 21, 2017 by Junxiong Guan Committed by Christoph Hellwig Apr 21, 2017

nvme: let dm-mpath distinguish nvme error codes



Currently most IOs which return the nvme error codes are retried on
the other path if those IOs returns EIO from NVMe driver. This
patch let Multipath distinguish nvme media error codes and some
generic or cmd-specific nvme error codes so that multipath will
not retry those kinds of IO, to save bandwidth.

Signed-off-by: Junxiong Guan <guanjunxiong@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

parent 7776db1c

drivers/nvme/host/core.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -75,6 +75,20 @@ static int nvme_error_status(struct request *req)
		return -ENOSPC;
		default:
		return -EIO;

		/*
		* XXX: these errors are a nasty side-band protocol to
		* drivers/md/dm-mpath.c:noretry_error() that aren't documented
		* anywhere..
		*/
		case NVME_SC_CMD_SEQ_ERROR:
		return -EILSEQ;
		case NVME_SC_ONCS_NOT_SUPPORTED:
		return -EOPNOTSUPP;
		case NVME_SC_WRITE_FAULT:
		case NVME_SC_READ_ERROR:
		case NVME_SC_UNWRITTEN_BLOCK:
		return -ENODATA;
		}
		}