On Apr 22, 2008 08:46 -0400, Theodore Ts'o wrote:
> Change the way we allocate bitmaps and inode tables if the FLEX_BG
> feature is used at mke2fs time. It places calculates a new offset for
> bitmaps and inode table base on the number of groups that the user
> wishes to pack together using the new "-G" option. Creating a
> filesystem with 64 block groups in a flex group can be done by:
>
> mke2fs -j -I 256 -O flex_bg -G 32 /dev/sdX
>
> @@ -1638,6 +1654,19 @@ static void PRS(int argc, char *argv[])
>
> if (inode_size == 0)
> inode_size = get_int_from_profile(fs_types, "inode_size", 0);
> + if (!flex_bg_size && (fs_param.s_feature_incompat &
> + EXT4_FEATURE_INCOMPAT_FLEX_BG))
> + flex_bg_size = get_int_from_profile(fs_types, "flex_bg_size",8);
> + if (flex_bg_size) {
> + if (!(fs_param.s_feature_incompat &
> + EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
> + com_err(program_name, 0,
> + _("Flex_bg feature not enabled, so "
> + "flex_bg size may not be specified"));
> + exit(1);
> + }
> + fs_param.s_log_groups_per_flex = int_log2(flex_bg_size);
> + }
Should specifying "-G" enable FLEX_BG, like specifying "-j" or "-J size"
will enable HAS_JOURNAL instead of requiring that "-O has_journal" needs
to be explicitly given?
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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