max_sectors in struct Scsi_Host specifies maximum number of sectors allowed in a single SCSI command. The data type of max_sectors is unsigned short, so the maximum transfer length per SCSI command is limited to less than 256MB in 4096-bytes sector size. (0xffff * 4096)
This commit increases the SCSI mid level's limitation for max_sectors upto the block layer's limitation for max_hw_sectors by extending the data type of max_sectors in struct Scsi_Host and scsi_host_template, so that SCSI lower level drivers can specify more than 0xffff. Signed-off-by: Akinobu Mita <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Jens Axboe <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Douglas Gilbert <[email protected]> Cc: [email protected] --- sg and sd changes are splitted into another patches. Otherwise, no change from previous version. include/scsi/scsi_host.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 94844fc..db7d8bd 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -408,7 +408,7 @@ struct scsi_host_template { /* * Set this if the host adapter has limitations beside segment count. */ - unsigned short max_sectors; + unsigned int max_sectors; /* * DMA scatter gather segment boundary limit. A segment crossing this @@ -652,7 +652,7 @@ struct Scsi_Host { short cmd_per_lun; short unsigned int sg_tablesize; short unsigned int sg_prot_tablesize; - short unsigned int max_sectors; + unsigned int max_sectors; unsigned long dma_boundary; /* * Used to assign serial numbers to the cmds. -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
