On Tue, Feb 18, 2020 at 5:44 PM Minchan Kim <minchan@xxxxxxxxxx> wrote:
>
> process_madvise syscall needs pidfd_get_pid function to translate
> pidfd to pid so this patch move the function to kernel/pid.c.
>
> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
> Cc: Christian Brauner <christian@xxxxxxxxxx>
> Suggested-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
> Reviewed-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
> ---
> include/linux/pid.h | 1 +
> kernel/exit.c | 17 -----------------
> kernel/pid.c | 17 +++++++++++++++++
> 3 files changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/include/linux/pid.h b/include/linux/pid.h
> index 998ae7d24450..993f68cb45c2 100644
> --- a/include/linux/pid.h
> +++ b/include/linux/pid.h
> @@ -75,6 +75,7 @@ extern const struct file_operations pidfd_fops;
> struct file;
>
> extern struct pid *pidfd_pid(const struct file *file);
> +struct pid *pidfd_get_pid(unsigned int fd);
>
> static inline struct pid *get_pid(struct pid *pid)
> {
> diff --git a/kernel/exit.c b/kernel/exit.c
> index 0b81b26a872a..43375f9d8bbc 100644
> --- a/kernel/exit.c
> +++ b/kernel/exit.c
> @@ -1470,23 +1470,6 @@ static long do_wait(struct wait_opts *wo)
> return retval;
> }
>
> -static struct pid *pidfd_get_pid(unsigned int fd)
> -{
> - struct fd f;
> - struct pid *pid;
> -
> - f = fdget(fd);
> - if (!f.file)
> - return ERR_PTR(-EBADF);
> -
> - pid = pidfd_pid(f.file);
> - if (!IS_ERR(pid))
> - get_pid(pid);
> -
> - fdput(f);
> - return pid;
> -}
> -
> static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop,
> int options, struct rusage *ru)
> {
> diff --git a/kernel/pid.c b/kernel/pid.c
> index 0f4ecb57214c..360ba480a2a9 100644
> --- a/kernel/pid.c
> +++ b/kernel/pid.c
> @@ -496,6 +496,23 @@ struct pid *find_ge_pid(int nr, struct pid_namespace *ns)
> return idr_get_next(&ns->idr, &nr);
> }
>
> +struct pid *pidfd_get_pid(unsigned int fd)
> +{
> + struct fd f;
> + struct pid *pid;
> +
> + f = fdget(fd);
> + if (!f.file)
> + return ERR_PTR(-EBADF);
> +
> + pid = pidfd_pid(f.file);
> + if (!IS_ERR(pid))
> + get_pid(pid);
> +
> + fdput(f);
> + return pid;
> +}
> +
> /**
> * pidfd_create() - Create a new pid file descriptor.
> *
> --
> 2.25.0.265.gbab2e86ba0-goog
>
Reviewed-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
