Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

[linux-2.6-block.git] / include / scsi / scsi_device.h

diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index c38f4fe5e64cf4f14b668328ab0cfac76ea5d496..fddc767c47871f9191cf7927c5ee037ed09aee58 100644 (file)
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -486,6 +486,52 @@ extern int scsi_is_sdev_device(const struct device *);
 extern int scsi_is_target_device(const struct device *);
 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
 
+/*
+ * scsi_execute_cmd users can set scsi_failure.result to have
+ * scsi_check_passthrough fail/retry a command. scsi_failure.result can be a
+ * specific host byte or message code, or SCMD_FAILURE_RESULT_ANY can be used
+ * to match any host or message code.
+ */
+#define SCMD_FAILURE_RESULT_ANY        0x7fffffff
+/*
+ * Set scsi_failure.result to SCMD_FAILURE_STAT_ANY to fail/retry any failure
+ * scsi_status_is_good returns false for.
+ */
+#define SCMD_FAILURE_STAT_ANY  0xff
+/*
+ * The following can be set to the scsi_failure sense, asc and ascq fields to
+ * match on any sense, ASC, or ASCQ value.
+ */
+#define SCMD_FAILURE_SENSE_ANY 0xff
+#define SCMD_FAILURE_ASC_ANY   0xff
+#define SCMD_FAILURE_ASCQ_ANY  0xff
+/* Always retry a matching failure. */
+#define SCMD_FAILURE_NO_LIMIT  -1
+
+struct scsi_failure {
+       int result;
+       u8 sense;
+       u8 asc;
+       u8 ascq;
+       /*
+        * Number of times scsi_execute_cmd will retry the failure. It does
+        * not count for the total_allowed.
+        */
+       s8 allowed;
+       /* Number of times the failure has been retried. */
+       s8 retries;
+};
+
+struct scsi_failures {
+       /*
+        * If a scsi_failure does not have a retry limit setup this limit will
+        * be used.
+        */
+       int total_allowed;
+       int total_retries;
+       struct scsi_failure *failure_definitions;
+};
+
 /* Optional arguments to scsi_execute_cmd */
 struct scsi_exec_args {
        unsigned char *sense;           /* sense buffer */
@@ -494,12 +540,14 @@ struct scsi_exec_args {
        blk_mq_req_flags_t req_flags;   /* BLK_MQ_REQ flags */
        int scmd_flags;                 /* SCMD flags */
        int *resid;                     /* residual length */
+       struct scsi_failures *failures; /* failures to retry */
 };
 
 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
                     blk_opf_t opf, void *buffer, unsigned int bufflen,
                     int timeout, int retries,
                     const struct scsi_exec_args *args);
+void scsi_failures_reset_retries(struct scsi_failures *failures);
 
 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 extern void sdev_enable_disk_events(struct scsi_device *sdev);