[LU-6260] more support for 3.16 linux kernel

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Labels: patch
• Environment: 3.16 kernel
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

earlier LU-5322 was closed out to capture those kernel support fixes that landed for 2.7.0
There are still outstanding issues that we don't have fixes for yet. Those will be done in later lustre versions, so creating this new ticket to track them.

One known issue first mentioned 15/Sep/14:

With the switch to 3.16 now seeing new build failures, even in client only builds. example errors:

  CC [M]  /home/bogl/lustre-release/lustre/llite/llite_capa.o
  CC [M]  /home/bogl/lustre-release/lustre/llite/rw26.o
/home/bogl/lustre-release/lustre/llite/rw26.c:700:9: error: initialization from incompatible pointer type [-Werror]
         .direct_IO      = ll_direct_IO_26,
         ^
/home/bogl/lustre-release/lustre/llite/rw26.c:700:9: error: (near initialization for ‘ll_aops.direct_IO’) [-Werror]
cc1: all warnings being treated as errors
make[6]: *** [/home/bogl/lustre-release/lustre/llite/rw26.o] Error 1
make[5]: *** [/home/bogl/lustre-release/lustre/llite] Error 2
make[4]: *** [/home/bogl/lustre-release/lustre] Error 2
make[3]: *** [_module_/home/bogl/lustre-release] Error 2
make[3]: Leaving directory `/usr/src/kernels/3.16.2-200.fc20.x86_64'
make[2]: *** [modules] Error 2
make[2]: Leaving directory `/home/bogl/lustre-release'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/bogl/lustre-release'
make: *** [all] Error 2

Recent comment in LU-5322 said this fix is still TBD.

Issue Links

• is blocked by: LU-6567 sanity test_69: test failed to respond and timed out
• is related to: LU-7052 iovec created with iov_iter_get_pages_alloc must be freed with kvfree
• is related to: LU-7382 (vvp_io.c:573:vvp_io_update_iov()) ASSERTION( vio->vui_tot_nrsegs >= vio->vui_iter->nr_segs ) failed
• is related to: LU-6215 Sync Lustre external tree with lustre linux kernel client
• is related to: LU-5322 support for 3.16 linux kernel

Comments

[Peter Jones]

Great! Thanks James

[James A Simmons]

Yes this work is finally done.

[Peter Jones]

So is it ok to mark this ticket as resolved now?

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/15028/
Subject: LU-6260 llite: add support for new iter functionality
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 044503492c8e2e4cc519c34f282744d3d941a759

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/14665/
Subject: LU-6260 llite: add support for direct IO api changes
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 98883bd3e2cc48a3a5674ce140ad74bece37df05

[Gerrit Updater]

James Simmons ([e-mail]) uploaded a new patch: http://review.whamcloud.com/15028
Subject: LU-6260 llite: add support for new iter functionality
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 302db32ec89b8a79343f01cebc309289ca6044a3

[James A Simmons]

Also in the 3.16 kernel we see the introduction of read_iter and write_iter. These later go on to replace the aio_write and aio_read functions. This change leads to the replacement of the generic_file_aio_XXX functions with the generic_file_XXX_iter functions in vvp_io.c.

[Gerrit Updater]

James Simmons ([e-mail]) uploaded a new patch: http://review.whamcloud.com/14665
Subject: LU-6260 llite: add support for direct IO api changes
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 396f0bd17ad097a06cbac81db46461074d7d8a41

[Blake Caldwell]

I recently ran Lustre with ldiskfs on Linux 3.18. The changes that were necessary are part of my github repo here:
https://github.com/bacaldwell/lustre

Most of the changes were rebased upstream Linux patches, which are referenced in my commits. The specific issue mentioned in this ticket was addressed by this commit:
https://github.com/bacaldwell/lustre/commit/663d8b7b2a6e42e0fba6b587f718732b1f756bd7#diff-8684eb9ba8f6ecca0e513931aa6bcd19R369

It needs quite a bit of cleanup, but hopefully will be a useful reference for this work.