On Tue, 29 Aug 2023 at 18:11, Bernd Schubert <bschubert@xxxxxxx> wrote:
>
> Take a shared lock in fuse_cache_write_iter. This was already
> done for FOPEN_DIRECT_IO in
>
> commit 153524053bbb ("fuse: allow non-extending parallel direct
> writes on the same file")
>
> but so far missing for plain O_DIRECT. Server side needs
> to set FOPEN_PARALLEL_DIRECT_WRITES in order to signal that
> it supports parallel dio writes.
Hmm, I think file_remove_privs() needs exclusive lock (due to calling
notify_change()). And the fallback case also.
Need to be careful with such locking changes...
Thanks,
Miklos
