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| author | Jens Axboe <jens.axboe@oracle.com> | 2007-08-07 09:02:51 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:12:53 +0200 |
| commit | a8474ce23a73185dd2bae4c884b1716474032d31 (patch) | |
| tree | 63501846b8aaef02579a868f6d5118b6a07c4a5e /include/scsi | |
| parent | 0cde8d9510e242c73b2d68f9949cd3c456c863b4 (diff) | |
| download | kernel-common-a8474ce23a73185dd2bae4c884b1716474032d31.tar.gz kernel-common-a8474ce23a73185dd2bae4c884b1716474032d31.tar.bz2 kernel-common-a8474ce23a73185dd2bae4c884b1716474032d31.zip | |
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.h | 7 | ||||
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 1 |
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 */ |