linux-kernel - Re: mkfs.f2fs gets stuck with "blk_update

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Date:	Tue, 02 Apr 2013 10:27:25 +0400
From:	Vyacheslav Dubeyko <slava@...eyko.com>
To:	Max Filippov <jcmvbkbc@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Jaegeuk Kim <jaegeuk.kim@...sung.com>,
	Jens Axboe <axboe@...nel.dk>,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: mkfs.f2fs gets stuck with "blk_update_request: bio idx 0 >=
 vcnt 0" on 3.8

On Tue, 2013-04-02 at 00:21 +0400, Max Filippov wrote:

[snip]
> > 
> > Could you share "cat /proc/partitions" and "strace mkfs.f2fs /dev/mmcblk0p3" outputs? I think that these outputs can be very useful for issue analysis.
> > 
> > By the way, can you reproduce the issue on another SD-card? Do you reproduce the issue only under pandaboard?
> 
> Yes, I can reproduce it on three SD cards of different vendors and different sizes.
> Unfortunately ATM I don't have any other board to try it on.
> 
> # cat /proc/partitions
> major minor  #blocks  name
> 
>  179        0    7782400 mmcblk0
>  179        1      40131 mmcblk0p1
>  179        2      32130 mmcblk0p2
>  179        3    5685248 mmcblk0p3
> 


As I see, you have several partition on your SD-card. How did it
prepared?

> strace output is the following:
> 
[snip]
> write(1, "Info: sector size = 512\n", 24) = 24
> write(1, "Info: total sectors = 11370496 ("..., 45) = 45
> write(1, "Info: zone aligned segment0 blka"..., 41) = 41
> fstat64(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(179, 3), ...}) = 0
> ioctl(3, BLKDISCARD

As I understand, the BLKDISCARD ioctl (to pre-discard all blocks on an
ssd, or a thinly-provisioned storage device) is a visible reason of the
issue. Unfortunately, as I see, mkfs.f2fs doesn't support option to
format partition without blocks discard step.

So, I think that it needs to investigate issue in the direction of
BLKDISCARD code on the kernel side. It makes sense to debug
f2fs_trim_device() method of mkfs.f2fs utility too. But I can't see
anything strange in this function at a glance.

With the best regards,
Vyacheslav Dubeyko.

> 
> 


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