Hi Jouni. On Mon, Sep 28, 2020 at 04:10:13PM +0300, Jouni Roivas <jouni.roivas@xxxxxxxxxx> wrote: > Do not report failure on zero sized writes, and handle them as no-op. This is a user visible change (in the case of a single write(2)), OTOH, `man write` says: > If count is zero and fd refers to a file other than a regular file, > the results are not specified. > @@ -3682,6 +3700,9 @@ static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf, > struct cgroup_subsys_state *css; > int ret; > > + if (!nbytes) > + return 0; > + > /* > * If namespaces are delegation boundaries, disallow writes to > * files in an non-init namespace root from inside the namespace Shouldn't just this guard be sufficient? Michal
