linux-ext4 - Re: ext4 unknown problem

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Date:	Tue, 31 Jul 2012 11:45:32 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	luvar@...intext.sk
CC:	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org,
	info <info@...intext.sk>
Subject: Re: ext4 unknown problem

On 7/31/12 2:18 AM, luvar@...intext.sk wrote:
> Hi,
> dmesg is probably useles:
> 
> Probably some logs after mounting...:
> 
> # dmesg | grep EXT
> EXT3-fs (md2): mounted filesystem with ordered data mode
> EXT3-fs (md2): using internal journal
> EXT3-fs (dm-2): using internal journal
> EXT3-fs (dm-2): mounted filesystem with ordered data mode
> EXT4-fs (dm-8): mounted filesystem with ordered data mode. Opts: (null)
> EXT4-fs (dm-3): mounted filesystem with ordered data mode. Opts: (null)
> EXT4-fs (dm-12): mounted filesystem without journal. Opts: (null)
> EXT4-fs (dm-8): re-mounted. Opts: commit=0
> EXT4-fs (dm-3): re-mounted. Opts: commit=0
> EXT4-fs (dm-12): re-mounted. Opts: commit=0

^^^ um, what's that all about?

In theory, according to the docs, that's the same as the default, I guess.

and:

                } else if (token == Opt_commit) {
                        if (arg == 0)
                                arg = JBD2_DEFAULT_MAX_COMMIT_AGE;

ok, I guess it is.

> EXT4-fs (dm-28): mounted filesystem with ordered data mode. Opts: (null)
> EXT3-fs (dm-10): using internal journal
> EXT3-fs (dm-10): mounted filesystem with ordered data mode
> 
> On last few lines, there is some info about usb key used on thic pc:
> 
> # dmesg | tail -n 30
> sd 14:0:0:0: [sdg] Asking for cache data failed
> sd 14:0:0:0: [sdg] Assuming drive cache: write through
...

> Other lines from dmesg seems not relevant. Should I post them too?

Usually best to post all the data and let us sort it out, yes.

-Eric

> PS: Writing to disk from jbd2/dm-3-8 still active (iotop shows it still on top of I/O activity).
> 
> LuVar
> 
> ----- "Theodore Ts'o" <tytso@....edu> wrote:
> 
>> On Mon, Jul 30, 2012 at 08:26:20PM +0100, LuVar wrote:
>>> Hi,
>>> I have seriouse issue here. I have copyied about 7GB files to one of
>> my ext4 partitions and from that point of time there is sustained
>> write to that partition from jbd2/dm-3-8 process. I have lunched "sudo
>> sync" command (about day ago :) and a few hours a after sync start, I
>> have tryied to use umount on that partition... Booth of them are still
>> running...
>>>
>>> I have no serious data there, but if I could be helpfull in
>> bugreport, give me some info what to do.
>>
>> Try running the dmesg command, and see if there's anything
>> interesting
>> there.  If you're not sure if it's interesting, send it to us and we
>> can take a quick look at it.
>>
>> Regards,
>>
>> 					- Ted
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