[Xen-devel] Xen 4.2 (missing) pygrub support for ext4 on rhel5/centos5 e4fsprogs..

[Pasi Kärkkäinen <pasik@xxxxxx>]

Hello,

Roger: If I didn't mix up people we had a chat about this at XenSummit :) 
so here's some info about the ext4 stuff on rhel5/centos5.

# yum search e4fsprogs
e4fsprogs.x86_64 : Utilities for managing the fourth extended (ext4) filesystem
e4fsprogs-devel.i386 : Ext4 filesystem-specific static libraries and headers
e4fsprogs-devel.x86_64 : Ext4 filesystem-specific static libraries and headers
e4fsprogs-libs.i386 : Ext4 filesystem-specific static libraries and headers
e4fsprogs-libs.x86_64 : Ext4 filesystem-specific static libraries and headers

# rpm -ql e4fsprogs-libs.i386
/lib/libe4p.so.2
/lib/libe4p.so.2.3
/lib/libext4fs.so.2
/lib/libext4fs.so.2.4

# rpm -ql e4fsprogs-libs.x86_64
/lib64/libe4p.so.2
/lib64/libe4p.so.2.3
/lib64/libext4fs.so.2
/lib64/libext4fs.so.2.4

# rpm -ql e4fsprogs-devel.i386
/usr/include/e4p
/usr/include/e4p/e2p.h
/usr/include/ext4fs
/usr/include/ext4fs/bitops.h
/usr/include/ext4fs/ext2_err.h
/usr/include/ext4fs/ext2_ext_attr.h
/usr/include/ext4fs/ext2_fs.h
/usr/include/ext4fs/ext2_io.h
/usr/include/ext4fs/ext2_types-i386.h
/usr/include/ext4fs/ext2_types.h
/usr/include/ext4fs/ext2fs.h
/usr/include/ext4fs/ext3_extents.h
/usr/include/ext4fs/tdb.h
/usr/lib/libe4p.a
/usr/lib/libe4p.so
/usr/lib/libext4fs.a
/usr/lib/libext4fs.so
/usr/lib/pkgconfig/e4p.pc
/usr/lib/pkgconfig/ext4fs.pc
/usr/share/info/libext4fs.info.gz

# rpm -ql e4fsprogs-devel.x86_64
/usr/include/e4p
/usr/include/e4p/e2p.h
/usr/include/ext4fs
/usr/include/ext4fs/bitops.h
/usr/include/ext4fs/ext2_err.h
/usr/include/ext4fs/ext2_ext_attr.h
/usr/include/ext4fs/ext2_fs.h
/usr/include/ext4fs/ext2_io.h
/usr/include/ext4fs/ext2_types-x86_64.h
/usr/include/ext4fs/ext2_types.h
/usr/include/ext4fs/ext2fs.h
/usr/include/ext4fs/ext3_extents.h
/usr/include/ext4fs/tdb.h
/usr/lib64/libe4p.a
/usr/lib64/libe4p.so
/usr/lib64/libext4fs.a
/usr/lib64/libext4fs.so
/usr/lib64/pkgconfig/e4p.pc
/usr/lib64/pkgconfig/ext4fs.pc
/usr/share/info/libext4fs.info.gz


And then some info about the included files in the stock rhel5/centos5 Xen rpms 
(Xen 3.1.2),
where pygrub does support ext4 using e4fsprogs-libs:


# rpm -ql xen-libs | grep fsimage
/usr/lib64/fs/ext2fs-lib/fsimage.so
/usr/lib64/fs/fat/fsimage.so
/usr/lib64/fs/iso9660/fsimage.so
/usr/lib64/fs/reiserfs/fsimage.so
/usr/lib64/fs/ufs/fsimage.so
/usr/lib64/libfsimage.so.1.0
/usr/lib64/libfsimage.so.1.0.0
/usr/lib/fs/ext2fs-lib/fsimage.so
/usr/lib/fs/fat/fsimage.so
/usr/lib/fs/iso9660/fsimage.so
/usr/lib/fs/reiserfs/fsimage.so
/usr/lib/fs/ufs/fsimage.so
/usr/lib/libfsimage.so.1.0
/usr/lib/libfsimage.so.1.0.0

# ldd /usr/lib/fs/ext2fs-lib/fsimage.so
        linux-gate.so.1 =>  (0xffffe000)
        libfsimage.so.1.0 => /usr/lib/libfsimage.so.1.0 (0xf7f09000)
        libext4fs.so.2 => /lib/libext4fs.so.2 (0xf7edb000)
        libc.so.6 => /lib/libc.so.6 (0xf7d82000)
        libpthread.so.0 => /lib/libpthread.so.0 (0xf7d68000)
        libcom_err.so.2 => /lib/libcom_err.so.2 (0xf7d64000)
        /lib/ld-linux.so.2 (0x00778000)


# ldd /usr/lib64/fs/ext2fs-lib/fsimage.so
        linux-vdso.so.1 =>  (0x00007fff9cffd000)
        libfsimage.so.1.0 => /usr/lib64/libfsimage.so.1.0 (0x00002adbbef0e000)
        libext4fs.so.2 => /lib64/libext4fs.so.2 (0x00002adbbf111000)
        libc.so.6 => /lib64/libc.so.6 (0x00002adbbf340000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00002adbbf697000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00002adbbf8b2000)
        /lib64/ld-linux-x86-64.so.2 (0x00000039dce00000)

So el5 stock Xen rpms provide ext2fs-lib/fsimage.so, which is linked against 
libext4fs.so.2,
and pygrub loads/uses fsimage.so.


Can you guys please post the patch/hack you're currently using with 
XenServer/XCP,
so we can decide what'd be the best way to get Xen 4.2 pygrub supporting ext4 
also on el5 ? 


Thanks,

-- Pasi


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