[Bug 12207] New: block reads/writes > 122880 bytes to USB tape drive gives EBUSY

[bugme-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=12207

           Summary: block reads/writes > 122880 bytes to USB tape drive
                    gives EBUSY
           Product: IO/Storage
           Version: 2.5
     KernelVersion: 2.6.16
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
        AssignedTo: linux-scsi@vger.kernel.org
        ReportedBy: philipm@sybase.com


Latest working kernel version: 2.6.13
Earliest failing kernel version: 2.6.16 (that I've been able to test, may be
2.6.14)
Distribution: Red Hat Enterprise 4, 5, Fedora 9, SuSE 9, 10, SuSE Enterprise
10, and Ubuntu 8.04 tested
Hardware Environment: both x86 and amd64 on server, Quantum CD160UE-SST tape
drive with 80/160 GB tape
Software Environment: Linux
Problem Description:

Any attempt to read() or write() more than 122880 bytes at a time to the USB
tape device results in EBUSY.

Steps to reproduce:

This happened inside our application when attempting to do a backup with a
large write size.  However, it can be reproduced with tar:
- tar -b 240 -cf /dev/st0 foo (works)
- tar -b 241 -cf /dev/st0 foo
tar: /dev/st0: Cannot write: Device or resource busy
tar: Error is not recoverable: exiting now

The reads and writes worked fine in 2.6.13 and earlier.


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