Re: Optional case-insensitivity

[Mark Harmstone <mark@harmstone.com>]

On 28/8/20 8:43 pm, Neal Gompa wrote:
> Hey,
>
> So I saw today on LWN an article about ext4 gaining the ability to do
> per file/folder case-insensitivity[1]. I can see some value in this
> property existing for subvolume/folder/file level for Btrfs for things
> like Wine and Darling, which could take advantage of this to help
> support Windows and macOS applications that expect insensitivity to
> work properly. In particular, I'm looking at how games are glitchy
> with case sensitivity because it's rarely tested (both Windows and
> macOS are case-insensitive by default).
>
> Has anyone looked at what it would take to do this in Btrfs too?
>
> [1]: https://lwn.net/Articles/829737/
Hi Neal,

FWIW, I emulate the reverse of this, optional case-insensitity, in my Windows
Btrfs driver, by using the xattr user.case_sensitive.

To do it properly, presumably all you'd need to do is add another DIR_INDEX/
DIR_ITEM pair to the inodes in question, though it'd imply another compat_ro
flag. I think it's something I've mentioned to Chris Mason before now.

Mark