Re: [PATCH v1 02/11] VFS permit cross device vfs_copy_file_range

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On Fri, Oct 19, 2018 at 07:14:23PM +0300, Amir Goldstein wrote:
> > On Fri, Oct 19, 2018 at 6:30 PM Olga Kornievskaia
> > <olga.kornievskaia@xxxxxxxxx> wrote:
> > > Allow copy_file_range to copy between different superblocks but only
> > > of the same file system types. This feature was of interest to CIFS
> > > as well as NFS.
> 
> Sorry, you meant to allow cross sb copy from client, so you do want
> to change user facing behavior.
> For that you need to declare a flag to opt in for the new behavior
> and document it.
> Please keep linux-api CC-ed when posting the flag.
> Referencing a draft for man page is recommended.

Huh?  We're allowed to make things work that used to fail.  There's no
need to add a flag that the user must set.



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