[LU-1646] mounting lustre oops on older kernels

• Type: Bug
• Resolution: Duplicate
• Priority: Minor
• Affects Version/s: Lustre 2.1.2
• Environment: sles10sp4
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: [e-mail]

Description

in lustre 2.1 and up, the lustre_fill_super() was changed to expect the anonymous pointer to be of the type struct lustre_mount_data2. however, the ifdef for lustre_get_sb() for kernels < 2.6.18 was not updated. the attached patch seems to fix things but you might run into trouble when nfs exporting from these old kernels since lmd_mnt cannot be filled in for these older kernels.

Issue Links

• is related to: LU-1718 fix Lustre NFS re-export for 3.0+ kernels

Comments

[Peter Jones]

ok thanks James!

[James A Simmons]

The patch from LU-812 that solves this problem has been landed to b2_1. This ticket can be closed.

[James A Simmons]

Chas can you test both patches. Also if you can please try a NFS export on one of your clients with lustre.

[James A Simmons]

Also besides patch http://review.whamcloud.com/#change,3661 from LU-812 you will need LU-1718 for NFS export which has the patch at http://review.whamcloud.com/#change,3840.

[Bob Glossman (Inactive)]

back port to b2_1
http://review.whamcloud.com/#change,3661

[chas williams - CONTRACTOR]

since you cant even mount lustre on really old kernels, i dont think anyone is using the nfs export feature. so this seems fine to me.

[Bob Glossman (Inactive)]

chas,
Is it OK if we disable NFS export in 2.1.x for really old kernels? Can you possibly work around that restriction by using 1.8.x with such old kernels, at least until we have a fix from LU-1718 available?

[Bob Glossman (Inactive)]

if we proceed with a back port we will also need LU-1718 back ported to reenable NFS export

[Bob Glossman (Inactive)]

The change in http://review.whamcloud.com/#change,1951 can be back ported, but with side effects. LU-1718 mentioned by James in the previous comment tracks the disable of reexport of lustre fs to NFS due to this change. Doing the back port would disable reexport to NFS for old kernels just as it is for 3.0+ kernels. This would remain true until a fix for LU-1718 is completed and back ported.

[James A Simmons]

More than that patch would need to be back ported. See LU-1718 as well.