On Sun, Jun 28, 2015 at 08:36:18AM +0200, Andreas Hartmann wrote:
> On Sat, Jun 27, 2015 at 8:10 PM, Richard Weinberger wrote:
> >On Sat, Jun 27, 2015 at 7:32 PM, Andreas Hartmann
> ><andihartm...@01019freenet.de> wrote:
> [...]
> >See __vfs_read().
> >Your module most not rely on such internals.
>
> Thanks for your hint to the function which exists since 3.19.
>
> Is there a site out there which lists all relevant changes done for
> each kernel version and the recommendations how to correctly handle
> them?
localhost. It's in Documentation/filesystems/porting in the kernel
source. To quote the relevant entry (not far from the end - they
are in chronological order):
[mandatory]
never call ->read() and ->write() directly; use __vfs_{read,write} or
wrappers; instead of checking for ->write or ->read being NULL, look for
FMODE_CAN_{WRITE,READ} in file->f_mode.
Sometimes TFM to R _is_ in the natural place...
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