[Ocfs2-devel] [PATCH 1/2] fiemap: Add new extent flag FIEMAP_EXTENT_SHARED

[Sunil Mushran]

Jamie Lokier wrote:
> It might be better to have a flag FIEMAP_EXTENT_NOT_SHARED.
>
> Apps which need to know the data is not shared can't safely check
> !(flags & FIEMAP_EXTENT_SHARED) because of old kernels which don't set
> the flag.

I'm probably not understanding your point. Won't the older kernels not set
FIEMAP_EXTENT_NOT_SHARED too.

If this is important, we could always add this flag in the stable kernel
trees. Both sharing of extents and fiemap are relatively new to the kernel.