[Bug 13143] scsi_debug doesn't manage more than 1Tb

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http://bugzilla.kernel.org/show_bug.cgi?id=13143





--- Comment #3 from Anonymous Emailer <anonymous@xxxxxxxxxxxxxxxxxxxx>  2009-04-25 04:41:58 ---
Reply-To: fujita.tomonori@xxxxxxxxxxxxx

On Tue, 21 Apr 2009 16:07:08 GMT
bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=13143
> 
>            Summary: scsi_debug doesn't manage more than 1Tb
>            Product: SCSI Drivers
>            Version: 2.5
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>         AssignedTo: scsi_drivers-other@xxxxxxxxxxxxxxxxxxxx
>         ReportedBy: tvignaud@xxxxxxxxxxxx
>         Regression: No
> 
> 
> While debugging a partitionner software that has issues with disks bigger than
> 1Tb, I found out that scsi_debug doesn't manage more than 1Tb:
> 
> # modprobe scsi_debug virtual_gb=1000
> # cat /proc/partitions |fgrep sdc
>    8       32 1048576000 sdc
> # rmmod scsi_debug
> # modprobe scsi_debug virtual_gb=1100
> # cat /proc/partitions |fgrep sdc
>    8       32 9223372035860725760 sdc
> 
> 
> dmesg shows that the additionnal 100Gb makes it loose sight:
> sd 16:0:0:0: [sdc] 2097152000 512-byte hardware sectors: (1.07 TB/1000 GiB)
> versus:
> sd 15:0:0:0: [sdc] 18446744071721451520 512-byte hardware sectors: (18.4
> EB/15.9 EiB)


=
From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Subject: [PATCH] scsi_debug: fix virtual disk larger than 1TB 

Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
 drivers/scsi/scsi_debug.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 213123b..41a2177 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -887,7 +887,7 @@ static int resp_start_stop(struct scsi_cmnd * scp,
 static sector_t get_sdebug_capacity(void)
 {
     if (scsi_debug_virtual_gb > 0)
-        return 2048 * 1024 * scsi_debug_virtual_gb;
+        return 2048 * 1024 * (sector_t)scsi_debug_virtual_gb;
     else
         return sdebug_store_sectors;
 }

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