On Jan 15, 2008 22:05 -0500, Rik van Riel wrote: > With a filesystem that is compartmentalized and checksums metadata, > I believe that an online fsck is absolutely worth having. > > Instead of the filesystem resorting to mounting the whole volume > read-only on certain errors, part of the filesystem can be offlined > while an fsck runs. This could even be done automatically in many > situations. In ext4 we store per-group state flags in each group, and the group descriptor is checksummed (to detect spurious flags), so it should be relatively straight forward to store an "error" flag in a single group and have it become read-only. As a starting point, it would be worthwhile to check instances of ext4_error() to see how many of them can be targetted at a specific group. I'd guess most of them could be (corrupt inodes, directory and indirect blocks, incorrect bitmaps). Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
