Working with UTF-8 in the kernel [LWN.net]

Working with UTF-8 in the kernel

Posted Apr 5, 2019 1:24 UTC (Fri) by xtifr (guest, #143)
In reply to: Working with UTF-8 in the kernel by nim-nim
Parent article: Working with UTF-8 in the kernel

If the case-insensitive FS is a user-space overlay on an existing filesystem, then you don't *need* to guess anything. It will do case-folding based on the locale of the user who mounted the overlay.

This means *all* the overheads will truly need to be present only for those who actively *use* the system.

I honestly don't know how this is all going forward without *at least* a user-space proof-of-concept system.

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Working with UTF-8 in the kernel

Posted Apr 6, 2019 21:56 UTC (Sat) by foom (subscriber, #14868) [Link]

> It will do case-folding based on the locale of the user who mounted the overlay.

But that behavior would be pretty awful -- which files you can access depending upon your current locale? There's a reason filesystems (including this ext4 proposal) store the mapping used when creating the filesystem...

> without *at least* a user-space proof-of-concept system.

Two have been mentioned already. Android has an overlay filesystem for local access, and samba implements it when exporting the filesystem over the network.