[PATCH] Change sync_file_range to be non-cancellable

[Florian Weimer]

On 10/21/2015 02:34 PM, Adhemerval Zanella wrote:
> This patch changes the linux specific sync_file_range syscalls to be
> non-cancellable.  The rationale is:
> 
> 1. This is a Linux specific syscall that is not mentioned in POSIX
>    cancellable entrypoints [1] and the standard states and implementation
>    shall not introduce cancellation points into any other functions
>    specified.

It says that we must not make any function mentioned in POSIX
cancellable.  We can certainly introduce our own functions which are
cancellable and not port of POSIX.

I think sync_file_range should be cancellable for consistency with fsync
and fdatasync.

Florian