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>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 37f22b6bb009..3153692da288 100644
--- 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,