X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fscsi%2Fscsi_host.h;h=0fd4746ee39d4437e788c37b9a7f59d9b65dc11a;hb=0c326331c8b107abc0a160e8899d749150b8f76a;hp=7d210cd6c38d03a476b4f06fe563126d69db42c2;hpb=f2e1d89f9b349b3cd914b7c6ec6368632f4ad048;p=linux-2.6

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 7d210cd6c3..0fd4746ee3 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -39,6 +39,9 @@ struct blk_queue_tags;
 #define DISABLE_CLUSTERING 0
 #define ENABLE_CLUSTERING 1
 
+#define DISABLE_SG_CHAINING 0
+#define ENABLE_SG_CHAINING 1
+
 enum scsi_eh_timer_return {
 	EH_NOT_HANDLED,
 	EH_HANDLED,
@@ -442,6 +445,15 @@ struct scsi_host_template {
 	 */
 	unsigned ordered_tag:1;
 
+	/*
+	 * true if the low-level driver can support sg chaining. this
+	 * will be removed eventually when all the drivers are
+	 * converted to support sg chaining.
+	 *
+	 * Status: OBSOLETE
+	 */
+	unsigned use_sg_chaining:1;
+
 	/*
 	 * Countdown for host blocking with no commands outstanding
 	 */
@@ -586,6 +598,7 @@ struct Scsi_Host {
 	unsigned unchecked_isa_dma:1;
 	unsigned use_clustering:1;
 	unsigned use_blk_tcq:1;
+	unsigned use_sg_chaining:1;
 
 	/*
 	 * Host has requested that no further requests come through for the