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 <akinobu.mita@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: "James E.J. Bottomley" <JBottomley@xxxxxxxxxxxxx>
Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Cc: linux-scsi@xxxxxxxxxxxxxxx
---
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
--
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