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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 <[email protected]>
This commit is contained in:
Jens Axboe 2007-08-07 09:02:51 +02:00
commit a8474ce23a
3 changed files with 163 additions and 54 deletions
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7
include/scsi/scsi.h
View file

@ -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
*/

1
include/scsi/scsi_cmnd.h
View file

@ -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 */