"Setting filesystem feature 'metadata_csum' not supported" when trying to enable ext4 metadata checksums

With Linux 3.5, it should be possible to use ext4 metadata checksums; enabling of which should be made with the following command:

# tune2fs -O metadata_csum /dev/sda1
tune2fs 1.42 (29-Nov-2011)
Setting filesystem feature 'metadata_csum' not supported.

Running kernel 3.5, tried the latest e2fsprogs from git.

Could you please checkout the 'pu' branch in e2fsprogs? You need to use pu branch of e2fsprogs because the patches of metadata checksum for e2fsprogs are in this branch.

BTW, until 3.5 kernel, it seems that metadata checksum still has a bug. Here is a patch to fix this bug [1].

1. http://www.spinics.net/lists/linux-ext4/msg32685.html

Quoted 8 lines · Zheng Liu

Could you please checkout the 'pu' branch in e2fsprogs? You need to use pu branch of e2fsprogs because the patches of metadata checksum for e2fsprogs are in this branch.

BTW, until 3.5 kernel, it seems that metadata checksum still has a bug. Here is a patch to fix this bug [1].

1. http://www.spinics.net/lists/linux-ext4/msg32685.html

OK, tried with pu branch and got this:

root@s9:/usr/src/e2fsprogs# misc/tune2fs -O metadata_csum /dev/sda1
tune2fs 1.42.3 (14-May-2012)
rewrite_directory: Unknown code kJe 176 while rewriting directories

Expected?

Quoted 5 lines

root@s9:/usr/src/e2fsprogs# misc/tune2fs -O metadata_csum /dev/sda1
tune2fs 1.42.3 (14-May-2012)
rewrite_directory: Unknown code kJe 176 while rewriting directories

Expected?

No, it seems that it is not our expectation. Could you please provide more information? Such as feature list. Use "debugfs -R 'stats' /dev/${DEVICE}" to get it, please.