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authorJens Axboe <jens.axboe@oracle.com>2007-08-07 09:02:51 +0200
committerJens Axboe <jens.axboe@oracle.com>2007-10-16 11:12:53 +0200
commita8474ce23a73185dd2bae4c884b1716474032d31 (patch)
tree63501846b8aaef02579a868f6d5118b6a07c4a5e /include/scsi
parent0cde8d9510e242c73b2d68f9949cd3c456c863b4 (diff)
SCSI: support for allocating large scatterlists
This is what enables large commands. If we need to allocate an sgtable that doesn't fit in a single page, allocate several SCSI_MAX_SG_SEGMENTS sized tables and chain them together. SCSI defaults to large chained sg tables, if the arch supports it. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/scsi.h7
-rw-r--r--include/scsi/scsi_cmnd.h1
2 files changed, 1 insertions, 7 deletions
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 9f8f80ab0c8b..702fcfeb37f1 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -11,13 +11,6 @@
#include <linux/types.h>
/*
- * The maximum sg list length SCSI can cope with
- * (currently must be a power of 2 between 32 and 256)
- */
-#define SCSI_MAX_PHYS_SEGMENTS MAX_PHYS_SEGMENTS
-
-
-/*
* SCSI command lengths
*/
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index a5439a4b8f97..4a5fa2d1c44c 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -70,6 +70,7 @@ struct scsi_cmnd {
/* These elements define the operation we ultimately want to perform */
unsigned short use_sg; /* Number of pieces of scatter-gather */
unsigned short sglist_len; /* size of malloc'd scatter-gather list */
+ unsigned short __use_sg;
unsigned underflow; /* Return error if less than
this amount is transferred */