From: Hannes Reinecke <hare@suse.de>
Date: Mon, 1 Jul 2013 13:16:25 +0000 (+0200)
Subject: [SCSI] return ENOSPC on thin provisioning failure
X-Git-Tag: v3.12-rc1~7^2~160
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a9d6ceb838755c24dde8a0ca02c3378926fc63db;p=profile%2Fivi%2Fkernel-x86-ivi.git

[SCSI] return ENOSPC on thin provisioning failure

When the thin provisioning hard threshold is reached we
should return ENOSPC to inform upper layers about this fact.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---

diff --git a/block/blk-core.c b/block/blk-core.c
index 93a18d1..68ce4d5 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2318,6 +2318,9 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
 		case -ETIMEDOUT:
 			error_type = "timeout";
 			break;
+		case -ENOSPC:
+			error_type = "critical space allocation";
+			break;
 		case -EIO:
 		default:
 			error_type = "I/O";
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 7be5229..1b1298c 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -354,11 +354,16 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
 		return SUCCESS;
 
 		/* these are not supported */
+	case DATA_PROTECT:
+		if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) {
+			/* Thin provisioning hard threshold reached */
+			set_host_byte(scmd, DID_ALLOC_FAILURE);
+			return SUCCESS;
+		}
 	case COPY_ABORTED:
 	case VOLUME_OVERFLOW:
 	case MISCOMPARE:
 	case BLANK_CHECK:
-	case DATA_PROTECT:
 		set_host_byte(scmd, DID_TARGET_FAILURE);
 		return SUCCESS;
 
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index e2af8ae..49020d5 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -726,6 +726,7 @@ EXPORT_SYMBOL(scsi_release_buffers);
  * -ENOLINK	temporary transport failure
  * -EREMOTEIO	permanent target failure, do not retry
  * -EBADE	permanent nexus failure, retry on other path
+ * -ENOSPC	No write space available
  * -EIO		unspecified I/O error
  */
 static int __scsi_error_from_host_byte(struct scsi_cmnd *cmd, int result)
@@ -744,6 +745,10 @@ static int __scsi_error_from_host_byte(struct scsi_cmnd *cmd, int result)
 		set_host_byte(cmd, DID_OK);
 		error = -EBADE;
 		break;
+	case DID_ALLOC_FAILURE:
+		set_host_byte(cmd, DID_OK);
+		error = -ENOSPC;
+		break;
 	default:
 		error = -EIO;
 		break;
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index e4cd3e9..d0387d8 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -457,6 +457,7 @@ static inline int scsi_is_wlun(unsigned int lun)
 				 * other paths */
 #define DID_NEXUS_FAILURE 0x11  /* Permanent nexus failure, retry on other
 				 * paths might yield different results */
+#define DID_ALLOC_FAILURE 0x12  /* Space allocation on the device failed */
 #define DRIVER_OK       0x00	/* Driver status                           */
 
 /*