Re: filesystems and year 2038

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On Tue, Apr 5, 2022 at 10:27 AM Colin Walters <walters@xxxxxxxxxx> wrote:
>
>
>
> On Tue, Apr 5, 2022, at 10:11 AM, Justin Forbes wrote:
> >
> > That list hasn't been edited in 5 years, but 256 bit inodes have been
> > the ext default for a very long time unless you specifically request
> > small.
>
> In current Fedora CoreOS we have 128 bit inodes for /boot, and this appears to be the default of `mkfs.ext4` for our chosen size of /boot:
>
> [root@cosa-devsh ~]# truncate -s 384M /var/tmp/disk.img
> [root@cosa-devsh ~]# mkfs.ext4 /var/tmp/disk.img
> mke2fs 1.46.3 (27-Jul-2021)
> Discarding device blocks: done
> Creating filesystem with 393216 1k blocks and 98304 inodes
> Filesystem UUID: 32e5f29f-5808-4feb-a8c2-83dfc3eef410
> Superblock backups stored on blocks:
>         8193, 24577, 40961, 57345, 73729, 204801, 221185
>
> Allocating group tables: done
> Writing inode tables: done
> Creating journal (8192 blocks): done
> Writing superblocks and filesystem accounting information: done
> [root@cosa-devsh ~]# tune2fs -l /var/tmp/disk.img  | grep 'Inode size'
> Inode size:               128
> [root@cosa-devsh ~]# rpm -q e2fsprogs
> e2fsprogs-1.46.3-1.fc35.x86_64
> [root@cosa-devsh ~]#
>
> Ah but with a 512M disk I do get 256 bit inodes, I bet that's the difference.
>
> >? I think the defaults for ext2 and ext3 even changed well over
> > 10 years ago.  The oldest disk I have here already has 256 bit inodes
> > even for /boot
>
> Or, maybe it's an Anaconda thing to override it?
>
> Anyways...for now I may just get the PR merged to update FCOS's /boot.

Anaconda creates a 1GB /boot these days, so I guess we already have
256 bit inodes with that size...



-- 
真実はいつも一つ!/ Always, there's only one truth!
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