On Thu, Mar 15, 2012 at 01:55:36PM -0400, Phillip Susi wrote: > >META_BG addresses both of these issues by distributing the group > >descriptor blocks into the filesystem for each "meta group" (= the > >number of groups whose descriptors fit into a single block). > > So it puts one GD block at the start of every several block groups? > Wouldn't that drastically slow down opening/mounting the fs since > the disk has to seek to every block group? Not necessarily; right now we pull in every single block group descriptor at mount time because we need to update s_free_inodes_count and s_free_blocks_count. If we change things so that we only pull in the block group descriptors at mount time after a journal replay (but not after a clean umount, when the last inodes count and free blocks count should be correctly updated), that would avoid seeking to every 16th block group at mount time. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
