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Reminder: we maintain a kernel feature wishlist here as part of the uapi group:

https://github.com/uapi-group/kernel-features

I just added a bunch of new entries to it (at the bottom). If you are looking for something to hack on (and have some kernel expertise, or would like to acquire it), would be more than excellent to work on those!

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@pid_eins possible future Outreachy project ?
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@jmorris @pid_eins yeah and fortunately we got plenty of budget for tha... oh, wait. Oh no.

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Noob question
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@brokenix I have no idea of riscv, no of vmsplice, nor of dcas. Sorry. Simply the wrong person to comment on this.

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@pid_eins "Ability to link an O_TMPFILE file into a directory while replacing an existing file" I had patches for this ages ago: https://lore.kernel.org/all/cover.1580251857.git.osandov__34029.5823452593$1580288332$gmane$org@fb.com/ My first few attempts died out waiting for Viro, and the last try got everyone worked up about the meaning of atomicity: https://lore.kernel.org/all/CAOQ4uxit0KYiShpEXt8b8SvN8bWWp3Ky929b+UWNDozTCUeTxg@mail.gmail.com/ Maybe now with @brauner maintaining the VFS, another attempt would have better luck...

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@osandov @brauner oh, i'd love if another attempt on this would be made. We currently hack around this in systemd, but that just makes the window where an aborted file update leaves files around very short but doesnt make it go away. Would be so good to get that properly fixed in the kernel.

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