Re: [RFC PATCH 00/31] netfs: [WIP] Allow the use of MSG_SPLICE_PAGES and use netmem allocator

[David Howells]

Hi Enzo,

> >     (d) Compression should be a matter of vmap()'ing these pages to form
> >     	 the source buffer, allocating a second buffer of pages to form a
> >     	 dest buffer, also in a bvecq, vmapping that and then doing the
> >     	 compression.  The first buffer can then just be replaced by the
> >     	 second.
> 
> OTOH, compression can't be in-place because SMB2 says that if
> compression fails, the original uncompressed request must be sent (i.e.
> src must be left untouched until smb_compress() finishes).

I've got a change which should achieve this, but it seems I can't test it.
None of ksmbd, samba and azure seem to support it:-/

David