[LU-5234] lustre builds on 3.12 kernels are broken

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.6.0
• Labels: HB patch
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

As noted by recent comment in LU-4416 builds of lustre on 3.12 kernels no longer work. Suspect this is due to the recent landing of a fix from LU-4906 in master. Can't even build clients which did work until very recently. example errors:

  CC [M]  /home/bogl/lustre-release/lustre/llite/dir.o
/home/bogl/lustre-release/lustre/llite/dir.c: In function
bll_dir_readb:
/home/bogl/lustre-release/lustre/llite/dir.c:249:4: error: implicit
declaration of function bfilldirb
[-Werror=implicit-function-declaration]
    done = filldir(cookie, ent->lde_name, namelen, lhash,
    ^
/home/bogl/lustre-release/lustre/llite/dir.c:249:19: error: bcookieb
undeclared (first use in this function)
    done = filldir(cookie, ent->lde_name, namelen, lhash,
                   ^
/home/bogl/lustre-release/lustre/llite/dir.c:249:19: note: each undeclared
identifier is reported only once for each function it appears in
cc1: all warnings being treated as errors
scripts/Makefile.build:324: recipe for target
'/home/bogl/lustre-release/lustre/llite/dir.o' failed
make[6]: *** [/home/bogl/lustre-release/lustre/llite/dir.o] Error 1
scripts/Makefile.build:485: recipe for target
'/home/bogl/lustre-release/lustre/llite' failed
make[5]: *** [/home/bogl/lustre-release/lustre/llite] Error 2
scripts/Makefile.build:485: recipe for target
'/home/bogl/lustre-release/lustre' failed
make[4]: *** [/home/bogl/lustre-release/lustre] Error 2
Makefile:1269: recipe for target '_module_/home/bogl/lustre-release' failed
make[3]: *** [_module_/home/bogl/lustre-release] Error 2
make[3]: Leaving directory '/home/bogl/linux-3.12.21-2'
autoMakefile:1022: recipe for target 'modules' failed
make[2]: *** [modules] Error 2
make[2]: Leaving directory '/home/bogl/lustre-release'
autoMakefile:569: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/bogl/lustre-release'
autoMakefile:474: recipe for target 'all' failed
make: *** [all] Error 2

I think this is due to recent changes to readdir code in lustre/llite/dir.c that don't take into account the HAVE_DIR_CONTEXT case from autoconf. Code was adjusted elsewhere in lustre to adapt to HAVE_DIR_CONTEXT being #define'ed or #undef'ed.

Issue Links

• is related to: LU-4416 support for 3.12 linux kernel