fast_commit option not recognized/supported by e2fsck?

fast_commit option not recognized/supported by e2fsck?

[Lakshmipathi.G]

Hi,
Seems like I can't use the new fast_commit option.

Steps:
$ apt-get install gcc make bison -y && wget
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/snapshot/e2fsprogs-1.46.4.tar.gz
tar -xvf e2fsprogs-1.46.4.tar.gz && cd e2fsprogs-1.46.4 && ./configure
&& make -j2 && sudo make install
$ sudo tune2fs -O fast_commit /dev/nvme0n1p2
# and verified flags with
$ sudo tune2fs -l /dev/nvme0n1p2 | grep fast_commit
Filesystem features:      has_journal ext_attr resize_inode dir_index
fast_commit filetype needs_recovery extent 64bit flex_bg sparse_super
large_file huge_file dir_nlink extra_isize metadata_csum
$ e2fsck -V
e2fsck 1.46.4 (18-Aug-2021)
Using EXT2FS Library version 1.46.4, 18-Aug-2021
$ uname -a
Linux db 5.13.0-1022-aws #24~20.04.1-Ubuntu SMP Thu Apr 7 22:14:11 UTC
2022 aarch64 aarch64 aarch64 GNU/Linux

Now I did a reboot and the system hangs. It shows the following error
message. Any thoughts on what's going wrong here? thanks!

```
Begin: Will now check root file system ... fsck from util-linux 2.34
[/usr/sbin/fsck.ext4 (1) -- /dev/nvme0n1p2] fsck.ext4 -a -C0 /dev/nvme0n1p2
/dev/nvme0n1p2 has unsupported feature(s): fast_commit
e2fsck: Get a newer version of e2fsck!

/dev/nvme0n1p2: ********** WARNING: Filesystem still has errors **********

fsck exited with status code 12
done.
Failure: File system check of the root filesystem failed
The root filesystem on /dev/nvme0n1p2 requires a manual fsck
```


----
Cheers,
Lakshmipathi.G
http://www.giis.co.in https://www.webminal.org

Re: fast_commit option not recognized/supported by e2fsck?

[Theodore Ts'o]

On Mon, May 16, 2022 at 03:00:14PM +0530, Lakshmipathi.G wrote:
> e2fsck 1.46.4 (18-Aug-2021)
> Using EXT2FS Library version 1.46.4, 18-Aug-2021
> $ uname -a
> Linux db 5.13.0-1022-aws #24~20.04.1-Ubuntu SMP Thu Apr 7 22:14:11 UTC
> 2022 aarch64 aarch64 aarch64 GNU/Linux
> 
> Now I did a reboot and the system hangs. It shows the following error
> message. Any thoughts on what's going wrong here? thanks!
> 
> ```
> Begin: Will now check root file system ... fsck from util-linux 2.34
> [/usr/sbin/fsck.ext4 (1) -- /dev/nvme0n1p2] fsck.ext4 -a -C0 /dev/nvme0n1p2
> /dev/nvme0n1p2 has unsupported feature(s): fast_commit
> e2fsck: Get a newer version of e2fsck!

E2fsck 1.46.4 supports fast commit.  I'm guessing what's going on is
that the version of e2fsck in the initial ramdisk is pre-1.46 and so
it didn't support fast commit --- and the root file system is checked
before it is mounted using scripts and binaries in the initrd.


After installing e2fsprogs, you need to update / recreate the
initramfs.  How to do this is distro-dependent, but since you are
using Ubuntu, try this:

   sudo update-initramfs -u -k all

See the man page for update-initramfs and mkinitramfs for more
information.

Cheers,

					- Ted

P.S.  fast commit is a relatively new feature, and we are still fixing
bugs in fast commit.  So please be careful before using it in a
production system, especially if it is mission- or life- critical.  If
you really want to use it, you may want to be using newer kernels than
5.13.0, such as 5.15 LTS.

Re: fast_commit option not recognized/supported by e2fsck?

[Lakshmipathi.G]

>   sudo update-initramfs -u -k all

After running the above update, now it works!

> P.S.  fast commit is a relatively new feature, and we are still fixing
> bugs in fast commit.  So please be careful before using it in a
> production system, especially if it is mission- or life- critical. If
> you really want to use it, you may want to be using newer kernels than
> 5.13.0, such as 5.15 LTS.

Thanks for the warning :-) I was actually testing this for production
systems :p I'll wait until it reaches a more stable form. Thank you!

----
Cheers,
Lakshmipathi.G
http://www.giis.co.in https://www.webminal.org