[Bug 109331] New: EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

[Bug 109331] New: EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=109331

            Bug ID: 109331
           Summary: EXT4-fs (sda1): couldn't mount as ext3 due to feature
                    incompatibilities
           Product: File System
           Version: 2.5
    Kernel Version: 3.4.2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@kernel-bugs.osdl.org
          Reporter: 3fdd1e5d@opayq.com
        Regression: No

Created attachment 197281
  --> https://bugzilla.kernel.org/attachment.cgi?id=197281&action=edit
config-4.3.2

I compiled 4.3.2 and when I was looking over the logs I noticed this message in
dmesg;

EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

I personally don't get this message, as to why the kernel is trying to mount
ext4 as ext3? Or at least it's the way the message comes across.

Can't say I've ever seen anything like this before in the kernel logs...

Hmm

I've attached my config

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=109331

KernelBug <3fdd1e5d@opayq.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|3.4.2                       |4.3.2

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=109331

--- Comment #1 from KernelBug <3fdd1e5d@opayq.com> ---
This is my fstab;

/dev/sda1        /                ext4        defaults           1 1
#/dev/cdrom      /mnt/cdrom       auto       
noauto,owner,ro,comment=x-gvfs-show 0 0
devpts           /dev/pts         devpts      gid=5,mode=620     0 0
proc             /proc            proc        defaults           0 0
tmpfs            /dev/shm         tmpfs       defaults           0 0

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=109331

--- Comment #2 from KernelBug <3fdd1e5d@opayq.com> ---
I do not have CONFIG_EXT4_USE_FOR_EXT23 compiled in the kernel.

After some reading, I'm seeing that the kernel looks for the filesystem, trying
them until it finds the one compiled in, hence the message?

>From what I've always thought, it's only going to look and see what is compiled
in, so I'm still not sure why I'm seeing this message.

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=109331

Huaitong Han <oenhan@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |oenhan@gmail.com

--- Comment #3 from Huaitong Han <oenhan@gmail.com> ---
what's the result of executing “file -s /dev/sda1” ? I guess sda1 filesystem is
ext3.

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=109331

--- Comment #4 from KernelBug <3fdd1e5d@opayq.com> ---
I'm running Slackware 14.1 x86_64 I formatted during the install as ext4.


file -s /dev/sda1

/dev/sda1: Linux rev 1.0 ext4 filesystem data,
UUID=7d75a56d-fa34-48c5-a278-45ede11df261 (needs journal recovery) (extents)
(large files) (huge files)

I don't claim to know everything as a Slacker, LOL, so either I forgot, or
didn't realize that the kernel is going to try each FS until it finds the one
compiled in.

Either way, this message shouldn't be appearing, telling us what we know
already, which is of course you can't load ext3 when you have it compiled for
ext4, such a pointless message...

Please let's get this fixed or silenced...

thanks

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

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https://bugzilla.kernel.org/show_bug.cgi?id=109331

Theodore Tso <tytso@mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P1                          |P3
                 CC|                            |tytso@mit.edu

--- Comment #5 from Theodore Tso <tytso@mit.edu> ---
The kernel's low-level boot path tries each file system --- and the problem is
that ext4 doesn't know whether this is part of the boot process mounting the
root file system, or the user explicitly trying to mount a file system as ext3.

When we dropped support for ext3 in recent kernels, CONFIG_EXT4_USE_FOR_EXT23
was renamed CONFIG_EXT4_USE_FOR_EXT2 and the ext3 bug-for-bug backwards
compatibility support was unconditionally included.   It was just a side effect
of how ext3 code was removed from the Linux kernel, and given that most
distributions would never explicitly want to remove ext3 support entirely lest
it break users' configs (i.e., so very, VERY few people compile kernels with
!CONFIG_EXT2_FS, !CONFIG_EXT3_FS, and !CONFIG_EXT4_USE_FOR_EXT23) no one really
noticed or cared.

We can "fix" this by either changing CONFIG_EXT4_USE_FOR_EXT2 back to
CONFIG_EXT4_USE_FOR_EXT23, which would support !ext2, !ext3compat, ext4, but
not allow ext2, !ext3co,pat, or ext4.   Or by adding a new Kconfig for
EXT4_USE_FOR_EXT3 that would explicitly turn on/off just the ext3 compatibility
code.

Personally, I don't really care enough to implement this, but if someone wants
to try their hand at a relatively simple kernel patch, please give it a try.

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

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https://bugzilla.kernel.org/show_bug.cgi?id=109331

--- Comment #6 from KernelBug <3fdd1e5d@opayq.com> ---
@Theodore Tso ok, well I'm not a coder here so I can't help...

I was just wondering why I was now getting this msg I'd never seen before.



Thanks

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

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https://bugzilla.kernel.org/show_bug.cgi?id=109331

Erik Quaeghebeur <kernelbugs@equaeghe.nospammail.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kernelbugs@equaeghe.nospamm
                   |                            |ail.net

--- Comment #7 from Erik Quaeghebeur <kernelbugs@equaeghe.nospammail.net> ---
(In reply to KernelBug from comment #6)
>
> I was just wondering why I was now getting this msg I'd never seen before.

FYI: You can get rid of it by informing the kernel about the root fs type, by
adding

  rootfstype=ext4

to the kernel command line.

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[Bug 109331] EXT4-fs (sda1): couldn't mount as ext3 due to feature incompatibilities

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https://bugzilla.kernel.org/show_bug.cgi?id=109331

ovile9080 (ovilewade9@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ovilewade9@gmail.com

--- Comment #8 from ovile9080 (ovilewade9@gmail.com) ---
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