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[SCSI] add use_sg_chaining option to scsi_host_template

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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 <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
FUJITA Tomonori
2007-10-16 11:24:32 +02:00
committed by Jens Axboe
parent c0dcffd71d
commit 9cb83c7529
39 changed files with 58 additions and 3 deletions
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include/scsi/scsi_host.h
+13
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@@ -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* Status: OBSOLETE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