Ext4 + barriers=1 + ssd + power loss while commiting to a git repo = broken repo?

[Michał Piotrowski]

W dniu 14 kwietnia 2011 11:19 użytkownik Andreas Schwab
<schwab at redhat.com> napisał:
> Michał Piotrowski <mkkp4x4 at gmail.com> writes:
>
>> W dniu 14 kwietnia 2011 11:04 użytkownik Andreas Schwab
>> <schwab at redhat.com> napisał:
>>> Michał Piotrowski <mkkp4x4 at gmail.com> writes:
>>>
>>>> But the question remains - should enabled barriers protect against
>>>> such data loss/breakage? Or I just had a big bad luck?
>>>
>>> It could also be a bug in git, perhaps it needs to take more care to
>>> create the ref file atomically.
>>
>> Should I report it to upstream or in bugzilla.redhat.com?
>
> Looking closer it seems like git already does the right thing
> (open("master.lock"), write(sha1), rename("master.lock", "master")), so
> it appears to be a barriers issue.

Do you see something unusual here?

[    3.926076] EXT4-fs (sda1): INFO: recovery required on readonly filesystem
[    3.926084] EXT4-fs (sda1): write access will be enabled during recovery
[    4.655780] EXT4-fs (sda1): orphan cleanup on readonly fs
[    4.655813] EXT4-fs (sda1): ext4_orphan_cleanup: deleting
unreferenced inode 269578
[    4.656046] EXT4-fs (sda1): ext4_orphan_cleanup: deleting
unreferenced inode 131130
[    4.656179] EXT4-fs (sda1): ext4_orphan_cleanup: deleting
unreferenced inode 131111
[    4.656250] EXT4-fs (sda1): ext4_orphan_cleanup: deleting
unreferenced inode 271833
[    4.656380] EXT4-fs (sda1): ext4_orphan_cleanup: deleting
unreferenced inode 271832
[    4.656455] EXT4-fs (sda1): ext4_orphan_cleanup: deleting
unreferenced inode 269763
[    4.656633] EXT4-fs (sda1): ext4_orphan_cleanup: deleting
unreferenced inode 131082
[    4.656696] EXT4-fs (sda1): 7 orphan inodes deleted
[    4.656701] EXT4-fs (sda1): recovery complete
[    4.667494] EXT4-fs (sda1): mounted filesystem with ordered data
mode. Opts: (null)



>
>> It seems to me that the repairing git repo without a deep knowledge of
>> it can be rather difficult.
>
> gitrepository-layout(5)

Thanks for the pointer

>
> Andreas.
>
> --
> Andreas Schwab, schwab at redhat.com
> GPG Key fingerprint = D4E8 DBE3 3813 BB5D FA84  5EC7 45C6 250E 6F00 984E
> "And now for something completely different."
>



-- 
Best regards,
Michal

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