[LU-5322] support for 3.16 linux kernel

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.7.0
• Type: Improvement
• Priority: Minor
• Reporter: Bob Glossman (Inactive)
• Assignee: Bob Glossman (Inactive)
• Resolution: Fixed

Environment

fc20

Description

tracker for 3.16 kernel support
all mods for kernel versions > 3.14 should be collected here

fc20 recently bumped their kernel version from 3.14.x to 3.15.x
new build failures are now showing up

Some issues already mentioned in comments in LU-4993

Issue Links

• is related to: LU-4993 support for 3.14 linux kernel
• is related to: LU-5609 support for 3.17 kernel
• is related to: LU-6260 more support for 3.16 linux kernel

Comments

[James A Simmons]

http://review.whamcloud.com/#/c/11058
http://review.whamcloud.com/#/c/11059

[James A Simmons]

Bob does this help ?

[Bob Glossman (Inactive)]

James, Yes, that help's a lot. With those patches I can build client-only again in 3.15+. I will need to refresh the ldiskfs patches before I can build servers. Changes from the 3.12 reference set are a bit more than those I had for 3.14.

[Bob Glossman (Inactive)]

fc20 just recently jumped from a 3.15.x kernels to 3.16.2-200.fc20. 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

[Bob Glossman (Inactive)]

similar build failure also seen in fc21 alpha, just announced. it also has a 3.16 kernel, just like fc20.

[Jodi Levi (Inactive)]

Patches landed to Master.

[Bastian Neuburger]

Still experiencing the build failure described by Bob on 15/Sep/14 with today's master (commit: 4de90170e2573321e7691364d1d527aedfd25ff9). As far as I understand the problem in this case are the changes to VFS from Linux 3.15 to 3.16. Documentation/filesystems/vfs.txt demands the following signature for direct_IO:
ssize_t (*direct_IO)(int, struct kiocb *, struct iov_iter *iter, loff_t offset);
whereas rw26.c in master has
static ssize_t ll_direct_IO_26(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t file_offset, unsigned long nr_segs)
which is ok until including Kernel 3.15 but not anymore for 3.16.
The upstream kernel lustre client has a matching function signature for it.

[James A Simmons]

Sorry I have been busy doing other clean ups. I plan to complete this for Lustre 2.8.

[Bob Glossman (Inactive)]

please track issues for later lustre versions in LU-6260