are you guys kidding me?
* create a new vmware vdisk with 512 MB
* kernel 5.7.0, e2fsprogs-1.45.5-1.fc31.x86_64
* mount the filesystem
Jun 6 18:37:57 master kernel: ext4 filesystem being mounted at /boot
supports timestamps until 2038 (0x7fffffff)
https://lore.kernel.org/patchwork/patch/1172334/
-----------------------------
this does *not* happen when the vdisk is 768 MB instead just 512 MB
large - what's te point of defaults which lead to warnings like this in
2020?
On Jun 6, 2020, at 10:45 AM, Reindl Harald <[email protected]> wrote:
>
> are you guys kidding me?
>
> * create a new vmware vdisk with 512 MB
> * kernel 5.7.0, e2fsprogs-1.45.5-1.fc31.x86_64
> * mount the filesystem
>
> Jun 6 18:37:57 master kernel: ext4 filesystem being mounted at /boot
> supports timestamps until 2038 (0x7fffffff)
>
> https://lore.kernel.org/patchwork/patch/1172334/
Hi Reindl,
It isn't clear if your complaint is about the warning message, or the
fact that this is an issue with the newly-formatted filesystem? The
*issue* of 2038 timestamps has always existed, but the warning message
is newly added so that people have time to fix this if necessary.
I wonder if it makes sense to add a superblock flag like "yes, I know
this is not 2038 compliant, and I don't care"?
> -----------------------------
>
> this does *not* happen when the vdisk is 768 MB instead just 512 MB
> large - what's te point of defaults which lead to warnings like this in
> 2020?
This is a matter of space usage. Enabling the 64-bit timestamps requires
that the filesystem be formatted with 256-byte inodes, since there wasn't
enough space in the original 128-byte inodes for the larger timestamps
(among other things). That means either 1/2 as many inodes for the
filesystem to fit in the same metadata space, or double the amount of
metadata usage for the filesystem (reducing free space).
The assumption is that smaller filesystems like this are unlikely to be
used for storing long-term data, so maximizing the usable space is most
important. It is unlikely you will be using the same /boot filesystem
in 18 years, and if you are it is even less likely that it is being
updated on a regular basis.
It is possible to enable the larger inodes for any size filesystem by
formatting with "mk2fs -I 256 <other options> <device>". See "man mke2fs"
for full details.
Cheers, Andreas
Am 08.06.20 um 22:15 schrieb Andreas Dilger:
> On Jun 6, 2020, at 10:45 AM, Reindl Harald <[email protected]> wrote:
>>
>> are you guys kidding me?
>>
>> * create a new vmware vdisk with 512 MB
>> * kernel 5.7.0, e2fsprogs-1.45.5-1.fc31.x86_64
>> * mount the filesystem
>>
>> Jun 6 18:37:57 master kernel: ext4 filesystem being mounted at /boot
>> supports timestamps until 2038 (0x7fffffff)
>>
>> https://lore.kernel.org/patchwork/patch/1172334/
>
> Hi Reindl,
> It isn't clear if your complaint is about the warning message, or the
> fact that this is an issue with the newly-formatted filesystem? The
> *issue* of 2038 timestamps has always existed, but the warning message
> is newly added so that people have time to fix this if necessary.
that it even is an issue with a newly-formatted filesystem in 220
> I wonder if it makes sense to add a superblock flag like "yes, I know
> this is not 2038 compliant, and I don't care"?
well, more or less i case because i expect that setups to still live in
2038 and it's unclear what happens then
>> -----------------------------
>>
>> this does *not* happen when the vdisk is 768 MB instead just 512 MB
>> large - what's te point of defaults which lead to warnings like this in
>> 2020?
>
> This is a matter of space usage. Enabling the 64-bit timestamps requires
> that the filesystem be formatted with 256-byte inodes, since there wasn't
> enough space in the original 128-byte inodes for the larger timestamps
> (among other things). That means either 1/2 as many inodes for the
> filesystem to fit in the same metadata space, or double the amount of
> metadata usage for the filesystem (reducing free space).
none of that would have mattered
Filesystem Type Size Used Available Use%
Mounted on
/dev/root ext4 738.9M 54.0M 669.6M 7% /
> The assumption is that smaller filesystems like this are unlikely to be
> used for storing long-term data
adventurous assumption
> so maximizing the usable space is most
> important. It is unlikely you will be using the same /boot filesystem
> in 18 years, and if you are it is even less likely that it is being
> updated on a regular basis.
why wouldn't it on virtual machines?
most of my stuff has the same golden master from 2008 as source and is
running happily the newest kernel and newest Fedora release
in the case with the new formatted filesystem it was even the rootfs
which was a 6 GB vdisk and i created a new one and copied the whole data
while mounte dfrom a different vm
> It is possible to enable the larger inodes for any size filesystem by
> formatting with "mk2fs -I 256 <other options> <device>". See "man mke2fs"
> for full details.
well, i decided to go from 512 MV to 768 MB which is at least magnitudes
smaller than 6 GB and don't throw warnings at the first mount