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SCSI: support for allocating large scatterlists

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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>
This commit is contained in:
Jens Axboe
2007-08-07 09:02:51 +02:00
parent 0cde8d9510
commit a8474ce23a
3 changed files with 170 additions and 61 deletions
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7
include/scsi/scsi.h
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@@ -10,13 +10,6 @@
#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
*/