[Bug 20072] New: tapeinfo reports MaxBlock: 16777215 but writes with blocksize >2M fail

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=20072

           Summary: tapeinfo reports MaxBlock: 16777215  but writes with
                    blocksize >2M fail
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 2.6.32.21
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
        AssignedTo: linux-scsi@vger.kernel.org
        ReportedBy: lkolbe@techfak.uni-bielefeld.de
                CC: sfrey@techfak.uni-bielefeld.de
        Regression: No


Created an attachment (id=33222)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=33222)
lsscsi of system

As subject says, tapeinfo reports the tape drives (IBM ULTRIUM-HH4) support 16M
Blocksize, but writing in blocksizes bigger than 2M fail 

root@shepherd:~# tapeinfo -f /dev/nst0
Product Type: Tape Drive
Vendor ID: 'IBM     '
Product ID: 'ULTRIUM-HH4     '
Revision: '85V3'
Attached Changer API: No
SerialNumber: '1K10014452'
MinBlock: 1
MaxBlock: 16777215
SCSI ID: 0
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: 0x48
Density Code: 0x46
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
BOP: yes
Block Position: 0
Partition 0 Remaining Kbytes: -1
Partition 0 Size in Kbytes: -1
ActivePartition: 0
EarlyWarningSize: 0

dd tests:
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=2M count=4
4+0 records in
4+0 records out
8388608 bytes (8.4 MB) copied, 7.52488 s, 1.1 MB/s
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=4M count=4
dd: writing `/dev/nst0': Device or resource busy
1+0 records in
0+0 records out
0 bytes (0 B) copied, 1.84202 s, 0.0 kB/s
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=8M count=4
dd: writing `/dev/nst0': Device or resource busy
1+0 records in
0+0 records out
0 bytes (0 B) copied, 1.76087 s, 0.0 kB/s
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=16M count=4
dd: writing `/dev/nst0': Invalid argument
1+0 records in
0+0 records out
0 bytes (0 B) copied, 0.00986913 s, 0.0 kB/s
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=15M count=4
dd: writing `/dev/nst0': Value too large for defined data type
1+0 records in
0+0 records out
0 bytes (0 B) copied, 0.00954276 s, 0.0 kB/s
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=16777215 count=4
dd: writing `/dev/nst0': Value too large for defined data type
1+0 records in
0+0 records out
0 bytes (0 B) copied, 0.0102587 s, 0.0 kB/s
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=16777214 count=4
dd: writing `/dev/nst0': Value too large for defined data type
1+0 records in
0+0 records out
0 bytes (0 B) copied, 0.0100916 s, 0.0 kB/s
root@shepherd:~# dd if=/dev/zero of=/dev/nst0 bs=2M count=4
4+0 records in
4+0 records out
8388608 bytes (8.4 MB) copied, 1.76435 s, 4.8 MB/s

lspci -vvvn and lsscsi -v are attached; do you need more info?

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