linux-ext4 - Re: Filesystem state: clean with errors

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Date:	Mon, 3 Jun 2013 16:07:33 -0400
From:	Autif Khan <autif.mlist@...il.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Filesystem state: clean with errors - what errors?

On Mon, Jun 3, 2013 at 3:34 PM, Eric Sandeen <sandeen@...hat.com> wrote:
> On 6/3/13 2:29 PM, Autif Khan wrote:
>> On Mon, Jun 3, 2013 at 3:13 PM, Eric Sandeen <sandeen@...hat.com> wrote:
>>> On 6/3/13 1:45 PM, Autif Khan wrote:
>>>> Executing dumpe2fs -h on one of the partitions says
>>>>
>>>> ...
>>>> Filesystem features:      has_journal ext_attr resize_inode dir_index
>>>> filetype extent flex_bg sparse_super large_file huge_file uninit_bg
>>>> dir_nlink extra_isize
>>>> Filesystem flags:         signed_directory_hash
>>>> Default mount options:    user_xattr acl
>>>> Filesystem state:         clean with errors
>>>> ...
>>>>
>>>> How can I find out what the errors are - the details of the errors.
>>>
>>> "clean" means the log has been replayed (log is not dirty)
>>> "with errors" means that it encountered concistency errors at runtime
>>>
>>> run e2fsck -f on it to see what it finds (or e2fsck -fn if you want a no-op
>>> dry run)
>>
>> --- spin ---
>>
>> ubuntu@...0013950af6fb:~$ sudo fsck -V -n -f /dev/sda5
>> fsck from util-linux 2.20.1
>> [/sbin/fsck.ext4 (1) -- /koko] fsck.ext4 -n -f /dev/sda5
>> e2fsck 1.42 (29-Nov-2011)
>> Warning!  /dev/sda5 is mounted.
>
> Surprising that it didn't find errors since you ran it on a mounted fs!
>
> That's also an older e2fsck, so I suppose it's possible that it missed
> something.
>
>> Pass 1: Checking inodes, blocks, and sizes
>> Pass 2: Checking directory structure
>> Pass 3: Checking directory connectivity
>> Pass 4: Checking reference counts
>> Pass 5: Checking group summary information
>> /dev/sda5: 24770/262144 files (0.1% non-contiguous), 328031/1048576 blocks
>> ubuntu@...0013950af6fb:~$
>>
>> I am not sure I see any errors. Is there an error here?
>
> No, that didn't report any errors.
>
> If you unmount it and do it w/o -n, it should clear the error state.
> Perhaps it encountered an error for a file that got subsequently deleted,
> or something - not sure.
>

That is true - we are able to fix this - almost trivially - the
problem is that we are causing this frequently (sometimes always) with
inexpensive SSDs. I am sure you have seen my other email:
http://marc.info/?l=linux-ext4&m=137028288823079&w=2

I assume that there is no other tool that I can use - (short of a hex
dump of the 4.0G partition using dd) - to further debug this. Is
there?
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