From 9cb83c7529d929c00f37d821daed1942a1b20602 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Tue, 16 Oct 2007 11:24:32 +0200 Subject: [SCSI] add use_sg_chaining option to scsi_host_template This option is true if a low-level driver can support sg chaining. This will be removed eventually when all the drivers are converted to support sg chaining. q->max_phys_segments is set to SCSI_MAX_SG_SEGMENTS if false. Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe --- include/scsi/scsi_host.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include/scsi/scsi_host.h') diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 7d210cd6c38..0fd4746ee39 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 + * + * Status: OBSOLETE + */ + unsigned use_sg_chaining:1; + /* * Countdown for host blocking with no commands outstanding */ @@ -586,6 +598,7 @@ struct Scsi_Host { unsigned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 -- cgit v1.2.3