[BUG] f2fs: mounting with kernel >= 4.5.0 fails

[BUG] f2fs: mounting with kernel >= 4.5.0 fails

[Matthias Prager]

Hello,

since kernel 4.5.0 I'm unable to mount f2fs filesystems with costom
section sizes.

I use 1 GiB section sizes (for smr-hdds). A filesystem created with the
command:

> mkfs.f2fs -l test2 -o 0 -a 0 -s 9 /dev/sdj

fails to mount in kernel 4.5.0 with the following dmesg output (3TB hdd):
> [  263.898973] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
> [  263.898977] F2FS-fs (sdj): Can't find valid F2FS filesystem in 1th superblock
> [  263.899142] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
> [  263.899144] F2FS-fs (sdj): Can't find valid F2FS filesystem in 2th superblock
> [  263.899148] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
> [  263.899150] F2FS-fs (sdj): Can't find valid F2FS filesystem in 1th superblock
> [  263.899152] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
> [  263.899154] F2FS-fs (sdj): Can't find valid F2FS filesystem in 2th superblock

It makes no difference whether the fs is created using kernel 4.5.0 or
earlier kernels (f2fs-tools are version 1.6.0 from gentoo stable, I
tested kernels 4.1.19, 4.3.3 and 4.4.6).

Using the command:

> mkfs.f2fs -l test2 -o 0 -a 0 /dev/sdj

instead (without the '-s 9' parameter), the fs is mountable with kernel
4.5.0 without any issues.

(The other parameters make no difference - i.e. 'mkfs.f2fs /dev/sdj' is
fine for kernel 4.5.0, 'mkfs.f2fs -s 9 /dev/sdj' is not. Different
custom sections sizes don't seem to make a difference.)

Is there a real problem with the fs or are the newly introduced checks
in kernel 4.5 simply buggy?

---
Matthias

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Re: [BUG] f2fs: mounting with kernel >= 4.5.0 fails

[Matthias Prager]

Hello,

thank you for the quick response! The supplied patch indeed fixes the
problem. Kernel 4.5.0 now mounts the fs with 1 GiB section size without
any errors. File transfer also works as it should.

Sidenote: I'm currently testing a Seagate 8TB smr hdd with regards to
performance under different filesystems. f2fs shows by far the most
consistent performance, when used with the mentioned parameters. Great
work this fs!

---
Matthias

Am 20.03.2016 um 23:45 schrieb Jaegeuk Kim:
> Hello,
> 
> Thank you for the report.
> It seems just a simple bug in sanity_check routine.
> 
> Could you please check the attached patch?
> 
> Thanks,
> 
> On Sun, Mar 20, 2016 at 10:53:19PM +0100, Matthias Prager wrote:
>> Hello,
>>
>> since kernel 4.5.0 I'm unable to mount f2fs filesystems with costom
>> section sizes.
>>
>> I use 1 GiB section sizes (for smr-hdds). A filesystem created with the
>> command:
>>
>>> mkfs.f2fs -l test2 -o 0 -a 0 -s 9 /dev/sdj
>>
>> fails to mount in kernel 4.5.0 with the following dmesg output (3TB hdd):
>>> [  263.898973] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
>>> [  263.898977] F2FS-fs (sdj): Can't find valid F2FS filesystem in 1th superblock
>>> [  263.899142] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
>>> [  263.899144] F2FS-fs (sdj): Can't find valid F2FS filesystem in 2th superblock
>>> [  263.899148] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
>>> [  263.899150] F2FS-fs (sdj): Can't find valid F2FS filesystem in 1th superblock
>>> [  263.899152] F2FS-fs (sdj): Wrong MAIN_AREA boundary, start(1502208) end(732566528) blocks(731063808)
>>> [  263.899154] F2FS-fs (sdj): Can't find valid F2FS filesystem in 2th superblock
>>
>> It makes no difference whether the fs is created using kernel 4.5.0 or
>> earlier kernels (f2fs-tools are version 1.6.0 from gentoo stable, I
>> tested kernels 4.1.19, 4.3.3 and 4.4.6).
>>
>> Using the command:
>>
>>> mkfs.f2fs -l test2 -o 0 -a 0 /dev/sdj
>>
>> instead (without the '-s 9' parameter), the fs is mountable with kernel
>> 4.5.0 without any issues.
>>
>> (The other parameters make no difference - i.e. 'mkfs.f2fs /dev/sdj' is
>> fine for kernel 4.5.0, 'mkfs.f2fs -s 9 /dev/sdj' is not. Different
>> custom sections sizes don't seem to make a difference.)
>>
>> Is there a real problem with the fs or are the newly introduced checks
>> in kernel 4.5 simply buggy?
>>
>> ---
>> Matthias
>>
>> ------------------------------------------------------------------------------
>> Transform Data into Opportunity.
>> Accelerate data analysis in your applications with
>> Intel Data Analytics Acceleration Library.
>> Click to learn more.
>> http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140
>> _______________________________________________
>> Linux-f2fs-devel mailing list
>> Linux-f2fs-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel


------------------------------------------------------------------------------
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Accelerate data analysis in your applications with
Intel Data Analytics Acceleration Library.
Click to learn more.
http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140