[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v6 4/5] fs, xfs: introduce MAP_DIRECT for creating block-map-atomic file ranges

On Thu, Aug 24, 2017 at 09:31:17AM -0700, Dan Williams wrote:
> External agent is a DMA device, or a hypervisor like Xen. In the DMA
> case perhaps we can use the fcntl lease mechanism, I'll investigate.
> In the Xen case it actually would need to use fiemap() to discover the
> physical addresses that back the file to setup their M2P tables.
> Here's the discussion where we discovered that physical address
> dependency:
>     https://lists.xen.org/archives/html/xen-devel/2017-04/msg00419.html

fiemap does not work to discover physical addresses.  If they want
to do anything involving physical address they will need a kernel

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.