[LU-5022] support for 3.10 rhel7 linux kernel

• Type: New Feature
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.6.0
• Labels: HB
• Environment: rhel7
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

tracker for 3.10 kernel support in rhel7

The 3.10 kernel in the rhel7 rc2 image is quite different from the mainline upstream 3.10 in kernel.org. It includes many features from 3.12 and even 3.13 kernels. In general most of the recipe mentioned in LU-4416 for 3.12 kernels is needed in rhel7 too. The only 3.12 patch that isn't needed is http://review.whamcloud.com/9300.

Establishing a separate tracker that will be specific to rhel7 as there are some mods that will only be relevant to the rhel7 kernel, and not 3.12 or later. One example is ldiskfs support. A new patch series specific to rhel7 will be needed.

Issue Links

• is related to: LU-5626 Corruption of MDT “..” entry in non-HTree ldiskfs directories
• is related to: LU-6096 sanity test_17m: e2fsck Inode 32775, i_size is 0, should be 4096
• is related to: LU-5307 e2fsprogs build fails in Centos 7
• is related to: LU-5884 bad lnet conf causes LBUG
• is related to: LU-5310 build error in Centos 7
• is related to: LU-5014 vfs_unlink api change
• is related to: LU-5853 el7 build broken
• is related to: LU-5825 Kernel update [RHEL7 3.10.0-123.9.2.el7]
• is related to: LU-4416 support for 3.12 linux kernel

Comments

[Li Xi (Inactive)]

It seems lbuild-rhel7 is missing in contrib/lbuild/Makefile.am. We should add it in some patch. Maybe http://review.whamcloud.com/#/c/12289/

[Bob Glossman (Inactive)]

no. as far as I can tell block tunable is still needed. until it can be deleted from old distros I don't think it should be deleted from el7.

[James A Simmons]

Have you considered dropping the block tunable patch?

[Bob Glossman (Inactive)]

James, I will do so as time permits.

[James A Simmons]

That is good news. So it looks like we don't need the quota patch. Will need to look into SuSE12 to see if it is case there.

[Bob Glossman (Inactive)]

I am pretty sure all the needed changes from James' attachment are already in place in upstream quota code in el7. only 2 minor exceptions:

1) the dqptr_sem deleted by the first patch still exists. all the references to it are gone, but the data structure was left in place. I'm assuming whoever ported this into el7 did it deliberately so I'm not willing to change it.

2) the last patch adding in locking around the shrinker doesn't seem to apply or be relevant. there is no dqcache_shrink_scan() routine in el7 to be fixed up.

[James A Simmons]

Here are the quota upstream patches that the RHEL7 kernel needs. It might need some massaging to have it apply to the RHEL7 kernel.

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/10249/
Subject: LU-5022 ldiskfs: enable support for RHEL7
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: eaf30e35002bf3936cdf7bf83685552d854f0f88

[Gerrit Updater]

Yang Sheng ([e-mail]) uploaded a new patch: http://review.whamcloud.com/13067
Subject: LU-5022 ldiskfs: cleanup ldiskfs_journal_dirty_metadata
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 4a0457a9e3559c872faa59c5361d84a86d8ee71c

[Gerrit Updater]

Yang Sheng ([e-mail]) uploaded a new patch: http://review.whamcloud.com/10249
Subject: LU-5022 ldiskfs: enable support for RHEL7
Project: fs/lustre-release
Branch: master
Current Patch Set: 20
Commit: d6683a2dd978dafa350e4e58c45df55cf44fe68f

[Minh Diep]

A closer look at the report, this patch hit a LBUG in https://testing.hpdd.intel.com/test_logs/16c19292-658a-11e4-8c86-5254006e85c2/show_text