On Nov 03 2016, Jose Lopes <jabolopes@xxxxxxxxx> wrote:
> Syscall 'ftruncate' makes the 'file' struct available to filesystem
> handlers. This makes it possible, e.g., for filesystems, such as,
> FUSE, to access the file handle associated with the file descriptor
> that was passed to 'ftruncate'. In the specific case of FUSE, this
> also makes it possible for (userspace) FUSE-based filesystems to
> distinguish between calls to 'truncate' and 'ftruncate'.
>
> From an implementation point of view, this is possible because the
> 'ftruncate' syscall passes the 'file' struct to the underlying
> filesystem handlers via the 'ia_file' field and the 'ia_valid' field
> mask.
>
> Similarly to 'ftruncate', pass the 'file' struct to 'fchmod', which
> allows filesystem handlers to get the file handle associated with the
> file descriptor passed to 'fchmod' and allows FUSE-based filesystems
> to distinguish between calls to 'chmod' and 'fchmod'.
>
> In a future patch, make a similar change to the 'fchown' and
> 'futimens' syscalls.
>
> Signed-off-by: Jose Lopes <jabolopes@xxxxxxxxx>
Tested-by: Nikolaus Rath <Nikolaus@xxxxxxxx>
Best,
-Nikolaus
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