[LU-3954] client-only "make rpms" ldiskfs detection inconsistent

• Type: Technical task
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.5.0
• Affects Version/s: Lustre 2.4.0
• Environment: patchless client: 2.6.32.26-175.fc12.x86_64
• Assignee: Minh Diep
• Reporter: Andreas Dilger

Description

I tried to build a client-only RPM using in the Lustre source tree for patchless kernel 2.6.32.26-175.fc12.x86_64 using the standard:

sh autogen
./configure
make rpms

In previous releases, configure would correctly detect that ldiskfs was not available for the kernel and/or the kernel sources were not available and do a client-only build.

Unfortunately, the 2.4.0 client build died in mid-stream due to inconsistent detection of ldiskfs support. In the top-level configure.ac file it has:

# Overridden by --without-ldiskfs/--with-zfs configure options
AM_CONDITIONAL(LDISKFS_ENABLED, true)

Which sets LDISKFS_ENABLED, but later on in the build it failed in mount_utils.c with:

mount_lustre-mount_utils.o: In function `osd_is_lustre': 
/usr/src/lustre-head/lustre/utils/mount_utils.c:461: undefined reference to `ldiskfs_is_lustre'          
mount_lustre-mount_utils.o: In function `osd_fini':
/usr/src/lustre-head/lustre/utils/mount_utils.c:650: undefined reference to `ldiskfs_fini'          
mount_lustre-mount_utils.o: In function `osd_init':
/usr/src/lustre-head/lustre/utils/mount_utils.c:632: undefined reference to `ldiskfs_init'

This is in

/* Was this device formatted for Lustre */
int osd_is_lustre(char *dev, unsigned *mount_type)
{
        vprint("checking for existing Lustre data: ");

#ifdef HAVE_LDISKFS_OSD
        if (ldiskfs_is_lustre(dev, mount_type)) {
                vprint("found\n");
                return 1;
        }
#endif /* HAVE_LDISKFS_OSD */

Since HAVE_LDISKFS_OSD is set, but mount_utils_ldiskfs.c is not being built. The ldiskfs configure step correctly detects no ldiskfs support for this kernel, and tries to disable ldiskfs and set -disable-server, but this is "lost" in the sub-configure step? The ldiskfs configure shouldn't set -disable-server itself anyway, because it may be a ZFS-only server system.

It would seem better to run the ldiskfs and ZFS configure stages early on in the configure process, then if no backing filesystem support is found, it should automatically set --disable-server for the main Lustre build.

Issue Links

• is related to: LU-3408 client-only "make rpms" ldiskfs detection inconsistent