On Jun 09, 2008 23:46 -0400, Theodore Ts'o wrote: > I've been trying to track down the problems in ext4's online-resizing, > and one of the ones which is most noticeable is that online resizing > mballoc has some specific data structures which need to be enlarged when > the number of block groups in the filesystem are grown dynamically. > > Specifically, the s_group_info array; in the current ext4 patch queue, > this isn't happening, which means after the online resizing operation, > when the filesystem is unmounted, ext4_put_super() calls > ext4_mb_release(), which then iterates over s_group_info array, and then > this triggers a kernel oops. > > Is clusterfs running with mballoc in production? If so, how was this > problem fixed? Did we miss a patch to make sure that on-line resizing > worked with mballoc enabled? When Lustre is mounting the backing filesystem on the server, there is no ext3 mountpoint visible to userspace, hence no access to the underlying filesystem to pass the resize ioctl to, so we haven't had this problem yet. We filed a bug on it, for the time that we can pass an ioctl through: https://bugzilla.lustre.org/show_bug.cgi?id=15208 We have another open bug related to resize2fs and uninit_bg, but that is for offline resizing: https://bugzilla.lustre.org/show_bug.cgi?id=12002 Both of these bugs are mere placeholders, they don't have any patches. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. -- 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
