[SCSI] add scsi_build_sense_buffer helper function

This adds scsi_build_sense_buffer, a simple helper function to build
sense data in a buffer.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 1221d2c..221f31e 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1993,3 +1993,31 @@ int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
        }
 }
 EXPORT_SYMBOL(scsi_get_sense_info_fld);
+
+/**
+ * scsi_build_sense_buffer - build sense data in a buffer
+ * @desc:      Sense format (non zero == descriptor format,
+ *             0 == fixed format)
+ * @buf:       Where to build sense data
+ * @key:       Sense key
+ * @asc:       Additional sense code
+ * @ascq:      Additional sense code qualifier
+ *
+ **/
+void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq)
+{
+       if (desc) {
+               buf[0] = 0x72;  /* descriptor, current */
+               buf[1] = key;
+               buf[2] = asc;
+               buf[3] = ascq;
+               buf[7] = 0;
+       } else {
+               buf[0] = 0x70;  /* fixed, current */
+               buf[2] = key;
+               buf[7] = 0xa;
+               buf[12] = asc;
+               buf[13] = ascq;
+       }
+}
+EXPORT_SYMBOL(scsi_build_sense_buffer);

diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 37a7614..d3a133b 100644 (file)
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -57,7 +57,9 @@ extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
 
 extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
                                   u64 * info_out);
- 
+
+extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
+
 /*
  * Reset request from external source
  */