Re: [PATCH] wireup linux/name_to_handle_at and name_to_handle_at syscalls

[Rich Felker <dalias@libc.org>]

On Wed, Sep 12, 2018 at 06:02:11PM -0700, Khem Raj wrote:
> Signed-off-by: Khem Raj <raj.khem@gmail.com>
> ---
>  include/fcntl.h               |  7 +++++++
>  src/linux/name_to_handle_at.c | 11 +++++++++++
>  src/linux/open_by_handle_at.c | 10 ++++++++++
>  3 files changed, 28 insertions(+)
>  create mode 100644 src/linux/name_to_handle_at.c
>  create mode 100644 src/linux/open_by_handle_at.c
> 
> diff --git a/include/fcntl.h b/include/fcntl.h
> index 6d8edcd1..5c3defcb 100644
> --- a/include/fcntl.h
> +++ b/include/fcntl.h
> @@ -155,6 +155,11 @@ int lockf(int, int, off_t);
>  #define F_OWNER_PID 1
>  #define F_OWNER_PGRP 2
>  #define F_OWNER_GID 2
> +struct file_handle {
> +	unsigned int handle_bytes;
> +	int handle_type;
> +	unsigned char f_handle[];
> +};
>  struct f_owner_ex {
>  	int type;
>  	pid_t pid;
> @@ -170,6 +175,8 @@ struct f_owner_ex {
>  #define SPLICE_F_GIFT 8
>  int fallocate(int, int, off_t, off_t);
>  #define fallocate64 fallocate
> +int name_to_handle_at(int, const char *, struct file_handle *, int *, int);
> +int open_by_handle_at(int, struct file_handle *, int);
>  ssize_t readahead(int, off_t, size_t);
>  int sync_file_range(int, off_t, off_t, unsigned);
>  ssize_t vmsplice(int, const struct iovec *, size_t, unsigned);
> diff --git a/src/linux/name_to_handle_at.c b/src/linux/name_to_handle_at.c
> new file mode 100644
> index 00000000..bb6f8007
> --- /dev/null
> +++ b/src/linux/name_to_handle_at.c
> @@ -0,0 +1,11 @@
> +#define _GNU_SOURCE
> +#include <fcntl.h>
> +#include "syscall.h"
> +
> +int name_to_handle_at(int dirfd, const char *pathname,
> +			struct file_handle *handle,
> +			int *mount_id, int flags)
> +{
> +	return syscall(SYS_name_to_handle_at, dirfd,
> +		pathname, handle, mount_id, flags);
> +}
> diff --git a/src/linux/open_by_handle_at.c b/src/linux/open_by_handle_at.c
> new file mode 100644
> index 00000000..9bc93f14
> --- /dev/null
> +++ b/src/linux/open_by_handle_at.c
> @@ -0,0 +1,10 @@
> +#define _GNU_SOURCE
> +#include <fcntl.h>
> +#include "syscall.h"
> +
> +int open_by_handle_at(int mount_fd, struct file_handle *handle,
> +                             int flags)
> +{
> +	return syscall(SYS_open_by_handle_at, mount_fd,
> +		handle, flags);
> +}
> -- 
> 2.19.0

Thanks. Merging with minor style fixes.

Rich