NVMe: Translate NVMe status to errno

This returns a more appropriate error for the "capacity exceeded"
status. In case other NVMe statuses have a better errno, this patch adds
a convience function to translate an NVMe status code to an errno for
IO commands, defaulting to the current -EIO.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 37f22b6..3153692 100644 (file)
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -450,6 +450,18 @@ static void nvme_end_io_acct(struct bio *bio, unsigned long start_time)
        }
 }
 
+static int nvme_error_status(u16 status)
+{
+       switch (status & 0x7ff) {
+       case NVME_SC_SUCCESS:
+               return 0;
+       case NVME_SC_CAP_EXCEEDED:
+               return -ENOSPC;
+       default:
+               return -EIO;
+       }
+}
+
 static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
                                                struct nvme_completion *cqe)
 {
@@ -469,7 +481,7 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
                        wake_up(&nvmeq->sq_full);
                        return;
                }
-               error = -EIO;
+               error = nvme_error_status(status);
        }
        if (iod->nents) {
                dma_unmap_sg(nvmeq->q_dmadev, iod->sg, iod->nents,