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| author | FUJITA Tomonori <tomof@acm.org> | 2007-10-16 13:24:32 +0400 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 13:24:32 +0400 |
| commit | 9cb83c7529d929c00f37d821daed1942a1b20602 (patch) | |
| tree | bb2fded1c443b1c370bdbe27076b62dc66eeddf2 /include/scsi | |
| parent | c0dcffd71d5064efefa620231152c38eca8e066b (diff) | |
| download | linux-9cb83c7529d929c00f37d821daed1942a1b20602.tar.xz | |
[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 <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_host.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 7d210cd6c38d..0fd4746ee39d 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, @@ -443,6 +446,15 @@ 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 + * + * Status: OBSOLETE + */ + unsigned use_sg_chaining:1; + + /* * Countdown for host blocking with no commands outstanding */ unsigned int max_host_blocked; @@ -586,6 +598,7 @@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 |