Am 17.01.2014 09:18, schrieb Oleksij Rempel:
> Am 17.01.2014 03:00, schrieb Darrick J. Wong:
>> On Thu, Jan 16, 2014 at 11:57:20AM +0100, Oleksij Rempel wrote:
>>> What is metadata_csum status?
>>>
>>> i see there are benchmark updates on wiki page, but no updates for
>>> e2fsprogs. 1.43-WIP seems to be really old.
>>
>> Still waiting for 1.43. I don't know if there are early adopters running
>> 1.43-WIP without complaint, or if simply nobody's using it at all. :/
>
> I didn't tested current master.git - my bad. It is not outdated :)
>
> Beside, the wiki should be corrected. If you enable 64bit, it will need
> extents too.
>
> Are there any existing tools for error injection for file systems?
> Random read error from libata or silent data corruptions?
>
I was playing with metadata_csum trying to kill my system and now i have
some questions:
first the test:
#find block number
sudo ./debugfs/debugfs -R "imap <3991825>" /dev/sdf1
#copy block
sudo dd if=/dev/sdf1 bs=4K count=1 skip=15958163 of=corrupt_block.bin
#change one byte
ghex corrupt_block.bin
#kill inode
sudo dd of=/dev/sdf1 bs=4K count=1 seek=15958163 if=corrupt_block.bin
sudo ./debugfs/debugfs -R "stat <3991825>" /dev/sdf1
#stat: Inode checksum does not match inode while reading inode 3991825
so, inode is corrupt:
- ext4 can detect inode corruption. Great work! I like it :)
- in this case file will not be shown by Nautilus.
- ls will show some thing like this:
4130898 drwx------ 8 oleksij oleksij 4096 Jan 17 09:31 Bilder
? -????????? ? ? ? ? ?
ich-einfach_unverbesserlich_2.mkv
3991826 -rw-rw-r-- 1 oleksij oleksij 622038707 Jan 17 11:12 igor.mkv
3989506 drwxr-xr-x 26 oleksij oleksij 4096 Okt 9 23:11 linux
it means, i know there is some thing wrong, but i do not know which inode
- If fs is not fixed, file is lost? are blocks still allocated to this
inode?
- debufs will not allow me to edit inode corrupt inode.
- If i run fsck -y file is lost. Most user wont be able to recover it.
- how can i sync it with back up software?
--
Regards,
Oleksij
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