[SCSI] Log thin provisioning threshold event

At least log the message that we received a THIN PROVISIONING SOFT
THRESHOLD REACHED Unit Attention.  Also added it to unit attention
decodes.
Signed-off-by: NShyam Iyer <shyam_iyer@dell.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

drivers/scsi/constants.c

@@ -772,6 +772,7 @@ static const struct error_info additional[] =
 	{0x3802, "Esn - power management class event"},
 	{0x3804, "Esn - media class event"},
 	{0x3806, "Esn - device busy class event"},
+	{0x3807, "Thin Provisioning soft threshold reached"},
 
 	{0x3900, "Saving parameters not supported"},
 

drivers/scsi/scsi_error.c

@@ -321,6 +321,12 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
 				    "changed. The Linux SCSI layer does not "
 				    "automatically adjust these parameters.\n");
 
+		if (sshdr.asc == 0x38 && sshdr.ascq == 0x07)
+			scmd_printk(KERN_WARNING, scmd,
+				    "Warning! Received an indication that the "
+				    "LUN reached a thin provisioning soft "
+				    "threshold.\n");
+
 		/*
 		 * Pass the UA upwards for a determination in the completion
 		 * functions.