[Bug 388] New: XFS on loop volume on raid device => filesystem corrupt

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http://oss.sgi.com/bugzilla/show_bug.cgi?id=388

           Summary: XFS on loop volume on raid device => filesystem corrupt
           Product: Linux XFS
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: Medium
         Component: XFS kernel code
        AssignedTo: xfs-master@xxxxxxxxxxx
        ReportedBy: abc@xxxxxxxxxx


I am using XFS on an encrypted loop devices (loop-aes.sourceforge.net) and that
runs on a software RAID 5 system.
Raid 5 doesn't support variable length transfers, normally xfs recognizes it and
disables variable length transfers, but here xfs only sees a LOOP device, so
variable length transfers are enabled and the filesystem gets completely
corrupted in this case.

I found a solution on another list:
http://mail.nl.linux.org/linux-crypto/2003-12/msg00024.html
This disables variable length transfers on all loop devices. Up to know, don't
know another solution.

--- fs/xfs/linux-2.4/xfs_buf.c.orig     Sun Aug  8 01:26:06 2004
+++ fs/xfs/linux-2.4/xfs_buf.c  Mon Aug 16 23:51:20 2004
@@ -1492,6 +1492,7 @@

        switch (MAJOR(btp->pbr_dev)) {
        case MD_MAJOR:
+       case LOOP_MAJOR:
        case EVMS_MAJOR:
                btp->pbr_flags = PBR_ALIGNED_ONLY;
                break;



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