diff options
| author | Jens Axboe <jens.axboe@oracle.com> | 2007-08-07 03:02:51 -0400 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 05:12:53 -0400 |
| commit | a8474ce23a73185dd2bae4c884b1716474032d31 (patch) | |
| tree | 63501846b8aaef02579a868f6d5118b6a07c4a5e /include/scsi/scsi_cmnd.h | |
| parent | 0cde8d9510e242c73b2d68f9949cd3c456c863b4 (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/scsi_cmnd.h')
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 1 |
1 files changed, 1 insertions, 0 deletions
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 { | |||
| 70 | /* These elements define the operation we ultimately want to perform */ | 70 | /* These elements define the operation we ultimately want to perform */ |
| 71 | unsigned short use_sg; /* Number of pieces of scatter-gather */ | 71 | unsigned short use_sg; /* Number of pieces of scatter-gather */ |
| 72 | unsigned short sglist_len; /* size of malloc'd scatter-gather list */ | 72 | unsigned short sglist_len; /* size of malloc'd scatter-gather list */ |
| 73 | unsigned short __use_sg; | ||
| 73 | 74 | ||
| 74 | unsigned underflow; /* Return error if less than | 75 | unsigned underflow; /* Return error if less than |
| 75 | this amount is transferred */ | 76 | this amount is transferred */ |