From a8474ce23a73185dd2bae4c884b1716474032d31 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 7 Aug 2007 09:02:51 +0200 Subject: 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 --- include/scsi/scsi.h | 7 ------- include/scsi/scsi_cmnd.h | 1 + 2 files changed, 1 insertion(+), 7 deletions(-) (limited to 'include/scsi') 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 @@ -10,13 +10,6 @@ #include -/* - * 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 */ -- cgit v1.2.3-55-g7522