Re: F25: How to force fsck at boot?

[Chris Murphy]

/forcefsck is obsolete

Modern file systems are expected to determine themselves if fsck is
needed. XFS, ext4, btrfs, all can do log replay at mount time and that
fixes the vast majority of problems. On XFS and Btrfs, if log replay
has problems, mount will fail and it's expected the user manually runs
repair.

So right off the bat, /forcefsck would apply only to ext4 on Fedora.
But there's another gotcha which is the file system has to be
consistent enough to mount ro in order to find the forcefsck hint. So
it's kinda unreliable. Next it required the use of preen on a read
only mounted volume, which upstream doesn't recommend. From e2fsck man
page.

"Note that in general it is not safe to run e2fsck on mounted
filesystems.  The only exception is if the -n option is specified"

In a somewhat recent systemd, it just pre-emptively runs the generic
fsck on rootfs before ro mount. On ext4 this causes e2fsck to get run
prior to ro mount which if the file system state is clean, it's a no
op. On XFS and Btrfs fsck is always a no op.


Chris Murphy
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Re: F25: How to force fsck at boot?

[Tim]

Allegedly, on or about 6 August 2017, Ahmad Samir sent:
> The root / filesystem isn't force-checked with /forcefsck; you'd have
> to use fsck.mode=force kernel boot parameter. I tested that on a
> clean
> install in a vm. The other filesystems listed in fsck are checked
> AFAICS.
> 
> systemd is deprecating /forcefsck, have a look at [1].
> 
> [1] https://github.com/systemd/systemd/search?q=forcefsck=

I thought the point of having a /forcefsck file is that software can
touch it to automate triggering it.  I doubt that can be done with a
kernel parameter.  This seems a really backward step, to me.

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Re: F25: How to force fsck at boot?

[Frédéric Bron]

> The root / filesystem isn't force-checked with /forcefsck; you'd have
> to use fsck.mode=force kernel boot parameter. I tested that on a clean
> install in a vm. The other filesystems listed in fsck are checked
> AFAICS.

Yes, I discovered that. All my filesystems were checked apart from /!

Frédéric
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Re: F25: How to force fsck at boot?

[Ahmad Samir]

On 5 August 2017 at 06:50, Samuel Sieb  wrote:
> On 08/04/2017 06:46 AM, Mamoru TASAKA wrote:
>>
>> Touching /forcefsck was for sysvinit and upstart era. It is no longer
>> valid
>> for systemd.
>
>
> This is still valid and has nothing to do with systemd.  It's handled by
> dracut in the initramfs.
>

The root / filesystem isn't force-checked with /forcefsck; you'd have
to use fsck.mode=force kernel boot parameter. I tested that on a clean
install in a vm. The other filesystems listed in fsck are checked
AFAICS.

systemd is deprecating /forcefsck, have a look at [1].

[1] https://github.com/systemd/systemd/search?q=forcefsck=

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Re: F25: How to force fsck at boot?

[Tim]

On 5/8/2017 2:35 pm, Samuel Sieb wrote:
It used to have a value, but it was not that helpful and could be quite 
annoying.


Back when hard drives were small, the occasional fsck was somewhat 
annoying.  I'd really hate to be stuck waiting while the computer checks 
through a 500 GB drive, just for the sake of it.


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Re: F25: How to force fsck at boot?

[Samuel Sieb]

On 08/04/2017 09:54 PM, Frédéric Bron wrote:

Yes, apparently from the last checked date, it seems that /forcefsck
worked but I was expecting to see something on the screen and it must
be done hidden.


Unless there's a problem, it will run very quickly.
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Re: F25: How to force fsck at boot?

[Samuel Sieb]

On 08/04/2017 09:59 PM, Frédéric Bron wrote:

Apparently the default value is -1 on my partitions which according to
the manual means "If max-mount-counts is 0 or -1, the number of times
the filesystem is mounted will be disregarded by e2fsck(8) and the
kernel."

So I guess that fsck is then ran only in case of problems?


Yes.  It used to have a value, but it was not that helpful and could be 
quite annoying.

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Re: F25: How to force fsck at boot?

[Frédéric Bron]

> sudo tune2fs -c 50 /dev/[your dev]
>
> the -c option set the interval of boots.  Change it to 1 and it will check
> every boot... 30 I believe is the current default because every boot is
> impractical imo.  I believe you can set the priority in the fstab.. last
> column if memory serves.  0 no check, 1 first, 2 after first.

Apparently the default value is -1 on my partitions which according to
the manual means "If max-mount-counts is 0 or -1, the number of times
the filesystem is mounted will be disregarded by e2fsck(8) and the
kernel."

So I guess that fsck is then ran only in case of problems?

Frédéric
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Re: F25: How to force fsck at boot?

[Frédéric Bron]

>> Touching /forcefsck was for sysvinit and upstart era. It is no longer
>> valid
>> for systemd.
>
> This is still valid and has nothing to do with systemd.  It's handled by
> dracut in the initramfs.

Yes, apparently from the last checked date, it seems that /forcefsck
worked but I was expecting to see something on the screen and it must
be done hidden.
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Re: F25: How to force fsck at boot?

[Frédéric Bron]

>>Apparently, this does not work:
>># tune2fs -l /dev/sda
>>tune2fs 1.43.3 (04-Sep-2016)
>>tune2fs: Bad magic number in super-block while trying to open /dev/sda
>>Found a gpt partition table in /dev/sda
>
> /dev/sda is usually a drive name, not a partition name.  Does it work if you 
> try /dev/sda1 or /dev/sda2?

It is the same but I found that I have to use /dev/nvme0n1p#
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Re: F25: How to force fsck at boot?

[Samuel Sieb]

On 08/04/2017 06:46 AM, Mamoru TASAKA wrote:

Touching /forcefsck was for sysvinit and upstart era. It is no longer valid
for systemd.


This is still valid and has nothing to do with systemd.  It's handled by 
dracut in the initramfs.

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Re: F25: How to force fsck at boot?

[Samuel Sieb]

On 08/03/2017 11:05 PM, fred roller wrote:

I believe you could use tune2fs command

sudo tune2fs -c 50 /dev/[your dev]

the -c option set the interval of boots.  Change it to 1 and it will 
check every boot... 30 I believe is the current default because every 
boot is impractical imo.  I believe you can set the priority in the 
fstab.. last column if memory serves.  0 no check, 1 first, 2 after first.


There is no need for this and it always happens at the worst time.  You 
do an emergency reboot for some reason and then you have to wait for a 
full fsck.

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Re: F25: How to force fsck at boot?

[Marmorstein, Robert]

>Apparently, this does not work:
># tune2fs -l /dev/sda
>tune2fs 1.43.3 (04-Sep-2016)
>tune2fs: Bad magic number in super-block while trying to open /dev/sda
>Found a gpt partition table in /dev/sda

/dev/sda is usually a drive name, not a partition name.  Does it work if you 
try /dev/sda1 or /dev/sda2?
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Re: F25: How to force fsck at boot?

[Frédéric Bron]

> It probably ran and you didn't see it. For ext2/3/4, you can run
>tune2fs -l /dev/{whatever} | grep "Last checked"

Apparently, this does not work:
# tune2fs -l /dev/sda
tune2fs 1.43.3 (04-Sep-2016)
tune2fs: Bad magic number in super-block while trying to open /dev/sda
Found a gpt partition table in /dev/sda
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Re: F25: How to force fsck at boot?

[Mamoru TASAKA]

Frédéric Bron wrote on 08/04/2017 02:05 PM:

I would like to force fsck at boot but I tried touch /forcefsck and it
did not run or I did not see it (however the file /forcefsck
disappeared).
Thanks,
Frédéric


Add the following to the boot parameter:
fsck.mode=force

Touching /forcefsck was for sysvinit and upstart era. It is no longer valid
for systemd.

Regards,
Mamoru

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Re: F25: How to force fsck at boot?

[Robert Nichols]

On 08/04/2017 12:05 AM, Frédéric Bron wrote:

I would like to force fsck at boot but I tried touch /forcefsck and it
did not run or I did not see it (however the file /forcefsck
disappeared).


It probably ran and you didn't see it. For ext2/3/4, you can run

   tune2fs -l /dev/{whatever} | grep "Last checked"

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Re: F25: How to force fsck at boot?

[fred roller]

I believe you could use tune2fs command

sudo tune2fs -c 50 /dev/[your dev]

the -c option set the interval of boots.  Change it to 1 and it will check
every boot... 30 I believe is the current default because every boot is
impractical imo.  I believe you can set the priority in the fstab.. last
column if memory serves.  0 no check, 1 first, 2 after first.

-- Fred
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