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LU-477 ldiskfs: allocate s_group_desc/s_group_info by vmalloc()
    
Add the patch to the RHEL6 ldiskfs patch series.
    
Large kmalloc() for sbi->s_group_desc and sbi->s_group_info can fail
for large filesystems (typically over 16TB), which will cause the
"not enough memory" error while mounting.  This patch makes allocation
fall back to vmalloc() if the kmalloc() failed, as what was done for
sbi->s_flex_groups.
    
To avoid colliding with an valid on-disk inode number, EXT4_BAD_INO
is used as the number of the buddy cache inode.
    
The patch also incorporates the following upstream kernel fix:
    
commit 32a9bb57d7c1fd04ae0f72b8f671501f000a0e9f
ext4: fix missing iput() of root inode for some mount error paths
https://bugzilla.kernel.org/show_bug.cgi?id=26752



Signed-off-by: Yu Jian <yujian whamcloud.com>
Change-Id: I3950425835ea7f2968ceb2edbc622e3ff3ed8545

LU-723 Enhance lustre/ldiskfs build system


Enhance the lustre/ldiskfs build system so it is more robust, flexible,
and consistent with lustre/zfs build system. This change is being made
in the interest of standardizing the infra-structure around backend
filesystems.

This change does not effect the current behavior of the --with-ldiskfs,
--enable-ext4, or --with-ldiskfsprogs configure options. However, it
does remove the obsolete --with-ldiskfs-inkernel configure option which
was only used by LLNL. It also adds the --with-ldiskfs-obj configure
option which improves flexibility. And the --enable-ldiskfs-build
configure option to support building against the lustre-ldiskfs-devel
package. The behavior of these options is consistent with their ZFS
counterparts, see commit 8c7266c for further details.

--enable-ext4 enable ldiskfs build using ext4
--enable-ldiskfs-build enable ldiskfs configure/make
--with-ldiskfs=path set path to ldiskfs source
--with-ldiskfs-obj=path set path to ldiskfs objects
--with-ldiskfsprogs use alternate names for ldiskfs-enabled e2fsprogs

Sample ./configure results when building lustre and ldiskfs using
the kernel-devel and kernel-debuginfo-common packages.

checking whether to enable ldiskfs... yes
checking ldiskfs source directory... /home/behlendo/src/git/lustre/ldiskfs
checking ldiskfs object directory... /home/behlendo/src/git/lustre/ldiskfs
checking ldiskfs module symbols... Module.symvers
checking ldiskfs source release... 3.3.0
checking whether to use ext3 or ext4 source... ext4
checking ext4 source directory... /usr/src/debug/.../fs/ext4
checking whether to build ldiskfs... yes
checking for /home/behlendo/src/git/lustre/ldiskfs/configure... yes
checking for /usr/src/debug/.../fs/ext4/dir.c... yes
checking for /usr/src/debug/.../fs/ext4/file.c... yes
checking for /usr/src/debug/.../fs/ext4/inode.c... yes
checking for /usr/src/debug/.../fs/ext4/super.c... yes
checking if ext4_ext_walk_space() takes i_data_sem... yes
checking if LDISKFS_SINGLEDATA_TRANS_BLOCKS takes sb as argument... yes
checking if ldiskfs_discard_preallocations defined... yes
checking if ldiskfs_ext_insert_extent needs 5 arguments... yes

In the context of this change additional cleanup has been done and
all of the ldiskfs specific code relocated to lustre-build-ldiskfs.m4.

Note that this change moves us closer to supporting patchless Lustre
servers with ldiskfs. Once the remaining kernel patches for Lustre
are dropped you will be able to build Lustre using the distribution
provided kernel-devel and kernel-debuginfo-common packages.

This change also incorperates ORI-340, commit f604951, which ensures
that the Module.symvers file will cleanly include the symbols for all
enabled Lustre backends. While the only backend supported by master
right now is ldiskfs this brings the master and orion branchs in to
sync in this regard.



Change-Id: I6f13f266944ec6967f4d7705a30b83ab8e577b15
Signed-off-by: Brian Behlendorf <behlendorf1 llnl.gov>
Signed-off-by: Prakash Surya <surya1 llnl.gov>