Scst_user doc updated

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@846 d57e44dd-8a1f-0410-8b47-8ef2f437770f

doc/scst_user_spec.txt

@@ -62,10 +62,12 @@ struct scst_user_dev_desc
 {
 	uint8_t version;
 	uint8_t type;
+	uint8_t sgv_shared;
 	uint8_t has_own_order_mgmt;
 	struct scst_user_opt opt;
 	uint32_t block_size;
 	char name[SCST_MAX_NAME];
+	char sgv_name[SCST_MAX_NAME];
 },
 
 where:
@@ -74,6 +76,9 @@ where:
 
  - type - SCSI type of the device
 
+ - sgv_shared - true, if SGV cache for this device should be shared with
+   other devices. False, if the SGV cache should be dedicated.
+
  - has_own_order_mgmt - set it in non-zero, if device implements own
    ORDERED commands management, i.e. guarantees commands execution order
    requirements, specified by SAM.
@@ -84,6 +89,8 @@ where:
 
  - name - name of the device
 
+ - sgv_name - name of SGV cache for this device
+
 SCST_USER_REGISTER_DEVICE returns registered device's handler or -1
 in case of error, and errno is set appropriately.