Hi all, Here's a short patch series that rolls up all my pending fixes for assorted minor problems with e2fsprogs. It then replaces all the open coded feature flag functions with a series of helper functions; and finally it introduces the "metdata_csum_seed" feature which decouples the metadata block checksums from the FS UUID so that said UUID can be changed while the FS is mounted. Patches 1-2 fix an incorrect overhead calculation in mke2fs when formatting with meta_bg that prevented formatting devices larger than 256TB; and teaches mke2fs to enable meta_bg whenever the group descriptor blocks overflow a block group. This makes it possible to format ext4 on multi-petabyte block devices, albeit at a SEVERE overhead cost. Patches 3-7 replace open-coded feature flag manipulation code with helper functions. I've hand-checked all the changes to ensure that they are correct. Patches 8-12 introduces the metadata_csum_seed feature, which saves the first component of metadata block checksums (specifically, the value of crc32c(~0, FS_UUID)) in the superblock. This enables the administrator to change the UUID on a mounted metadata_csum filesystem. The patchset should apply cleanly against the -next branch as of 29 September. Comments and questions are, as always, welcome. --D -- 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
