From 6f3a6b4f7d4604f1a314a8a19b00f54d0eaa0af8 Mon Sep 17 00:00:00 2001
From: Lucjan Bryndza <lucjan.bryndza@mudita.com>
Date: Wed, 13 Jan 2021 15:45:39 +0100
Subject: [PATCH] [EGD-5199] Add support for mount umount

Add support for mount umount in the libiosyscall library
due to planning to use ro fatfs and remount to rw only
for update purposes.

Signed-off-by: Lucjan Bryndza <lucjan.bryndza@mudita.com>
---
 .../libiosyscalls/src/syscalls_posix.cpp      | 34 +++++++++++++++++++
 board/linux/libiosyscalls/version.txt         |  3 ++
 2 files changed, 37 insertions(+)

diff --git a/board/linux/libiosyscalls/src/syscalls_posix.cpp b/board/linux/libiosyscalls/src/syscalls_posix.cpp
index 2dbb5cc2c73fd4e6bacde3213a5efc2d72384e24..a175eff8cff8690e9f566fc4a41da2bf5152e5f0 100644
--- a/board/linux/libiosyscalls/src/syscalls_posix.cpp
+++ b/board/linux/libiosyscalls/src/syscalls_posix.cpp
@@ -6,6 +6,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/mount.h>
 #include <fcntl.h>
 
 #include <errno.h>
@@ -550,4 +551,37 @@ extern "C" {
         return -1;
     }
     __asm__(".symver _iosys_fxstatat64,__fxstatat64@GLIBC_2.4");
+
+    int _iosys_mount (const char *special_file, const char *dir,
+		  const char *fstype, unsigned long int rwflag,
+		  const void *data)
+    {
+        if(vfs::redirect_to_image(dir))
+        {
+            return vfs::invoke_fs(__VFS(mount), special_file, dir, fstype, rwflag );
+        }
+        else
+        {
+            //NOTE: Always return zero because we will use fileystem which is always RW
+            TRACE_SYSCALLN("(%s, %s, %s, %08lx,%p) -> linux fs", special_file, dir,fstype, rwflag, data);
+            return 0;
+        }
+    }
+    __asm__(".symver _iosys_mount,mount@GLIBC_2.2.5");
+
+    int _iosys_umount (const char *mount_point)
+    {
+        if(vfs::redirect_to_image(mount_point))
+        {
+            return vfs::invoke_fs(__VFS(umount), mount_point );
+        }
+        else
+        {
+            //NOTE: Always return zero because we will use fileystem which is always RW
+            TRACE_SYSCALLN("(%s) -> linux fs", mount_point);
+            return 0;
+        }
+    }
+    __asm__(".symver _iosys_umount,umount@GLIBC_2.2.5");
+
 }
diff --git a/board/linux/libiosyscalls/version.txt b/board/linux/libiosyscalls/version.txt
index 52034128c449c3da51448abddbe7adbc7d80def9..3a4c4fadeee299774f94906f1c579d4f48584ca1 100644
--- a/board/linux/libiosyscalls/version.txt
+++ b/board/linux/libiosyscalls/version.txt
@@ -68,6 +68,9 @@ GLIBC_2.2.5 {
                 __xstat64;
                 __lxstat64;
                 __fxstat64;
+                mount;
+                umount;
+
         local:
                 *;
 };