| From | David Howells <> | Subject | Re: Add fchmodat2() - or add a more general syscall? | Date | Tue, 25 Jul 2023 19:39:51 +0100 |
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Florian Weimer <fweimer@redhat.com> wrote:
> > Rather than adding a fchmodat2() syscall, should we add a > > "set_file_attrs()" syscall that takes a mask and allows you to set a bunch > > of stuff all in one go? Basically, an interface to notify_change() in the > > kernel that would allow several stats to be set atomically. This might be > > of particular interest to network filesystems. > > Do you mean atomically as in compare-and-swap (update only if old values > match), or just a way to update multiple file attributes with a single > system call?
I was thinking more in terms of the latter. AFAIK, there aren't any network filesystems support a CAS interface on file attributes like that. To be able to do a CAS operation, we'd need to pass in the old values as well as the new.
Another thing we could look at is doing "create_and_set_attrs()", possibly allowing it to take a list of xattrs also.
David
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