musl: pick upstream patches for name_to_handle_at support

pkgs/os-specific/linux/musl/default.nix

@@ -67,6 +67,9 @@ stdenv.mkDerivation rec {
     ./0001-in-pthread_mutex_trylock-EBUSY-out-more-directly-whe.patch
     ./0002-in-pthread_mutex_timedlock-avoid-repeatedly-reading-.patch
     ./0003-fix-namespace-violation-for-c11-mutex-functions.patch
+    # name_to_handle_at
+    ./name-to-handle-at.patch
+    ./max-handle-sz-for-name-to-handle-at.patch
   ];
   preConfigure = ''
     configureFlagsArray+=("--syslibdir=$out/lib")

pkgs/os-specific/linux/musl/max-handle-sz-for-name-to-handle-at.patch

@@ -0,0 +1,26 @@
+From 7d7f44253f2d8cfd0a7adf9f918d88aa24d4e012 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Thu, 13 Sep 2018 07:00:05 -0700
+Subject: [PATCH] define MAX_HANDLE_SZ for use with name_to_handle_at
+
+MAX_HANDLE_SZ is described in name_to_handle_at() to contain maximum
+expected size for a file handle
+---
+ include/fcntl.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/include/fcntl.h b/include/fcntl.h
+index 99b21759..4d91338b 100644
+--- a/include/fcntl.h
++++ b/include/fcntl.h
+@@ -166,6 +166,7 @@ struct f_owner_ex {
+ };
+ #define FALLOC_FL_KEEP_SIZE 1
+ #define FALLOC_FL_PUNCH_HOLE 2
++#define MAX_HANDLE_SZ 128
+ #define SYNC_FILE_RANGE_WAIT_BEFORE 1
+ #define SYNC_FILE_RANGE_WRITE 2
+ #define SYNC_FILE_RANGE_WAIT_AFTER 4
+-- 
+2.19.0
+

pkgs/os-specific/linux/musl/name-to-handle-at.patch

@@ -0,0 +1,71 @@
+From 3e14bbcd1979376b188bfabb816ff828608fb5d7 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Wed, 12 Sep 2018 18:02:11 -0700
+Subject: [PATCH] wireup linux/name_to_handle_at and name_to_handle_at syscalls
+
+---
+ include/fcntl.h               |  7 +++++++
+ src/linux/name_to_handle_at.c | 10 ++++++++++
+ src/linux/open_by_handle_at.c |  8 ++++++++
+ 3 files changed, 25 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..99b21759 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 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..cd4075bd
+--- /dev/null
++++ b/src/linux/name_to_handle_at.c
+@@ -0,0 +1,10 @@
++#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..1c9b6a2b
+--- /dev/null
++++ b/src/linux/open_by_handle_at.c
+@@ -0,0 +1,8 @@
++#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
+