[PATCH 4/6] cxlflash: Transition to application close model

Manoj Kumar manoj at linux.vnet.ibm.com
Fri Aug 19 13:53:24 AEST 2016

Acked-by: Manoj N. Kumar <manoj at linux.vnet.ibm.com>

On 8/9/2016 6:39 PM, Matthew R. Ochs wrote:
> Caching the adapter file descriptor and performing a close on behalf
> of an application is a poor design. This is due to the fact that once
> a file descriptor in installed, it is free to be altered without the
> knowledge of the cxlflash driver. This can lead to inconsistencies
> between the application and kernel. Furthermore, the nature of the
> former design is more exploitable and thus should be abandoned.
> To support applications performing a close on the adapter file that
> is associated with a context, a new flag is introduced to the user
> API to indicate to applications that they are responsible for the
> close following the cleanup (detach) of a context. The documentation
> is also updated to reflect this change in behavior.
> Inspired-by: Al Viro <viro at zeniv.linux.org.uk>
> Signed-off-by: Matthew R. Ochs <mrochs at linux.vnet.ibm.com>

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