From 5b6085504086f72939306337dfec01698b1a92cb Mon Sep 17 00:00:00 2001
From: Kaimakan71 <undefined.foss@gmail.com>
Date: Sat, 27 Apr 2024 09:21:31 -0400
Subject: kernel: vfs: Implement sys_mount()

Signed-off-by: Kaimakan71 <undefined.foss@gmail.com>
Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/sys/syscall.h |  1 +
 sys/include/sys/vfs.h     |  2 ++
 sys/kern/kern_syscall.c   |  2 ++
 sys/kern/vfs_mount.c      | 51 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 56 insertions(+)

diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h
index a2ca992..6a102aa 100644
--- a/sys/include/sys/syscall.h
+++ b/sys/include/sys/syscall.h
@@ -47,6 +47,7 @@ enum {
     SYS_munmap,
     SYS_ioctl,
     SYS_execv,
+    SYS_mount,
     __MAX_SYSCALLS
 };
 
diff --git a/sys/include/sys/vfs.h b/sys/include/sys/vfs.h
index a55af12..98c784f 100644
--- a/sys/include/sys/vfs.h
+++ b/sys/include/sys/vfs.h
@@ -55,6 +55,8 @@ ssize_t vfs_read(struct vnode *vp, struct sio_txn *sio);
 ssize_t vfs_write(struct vnode *vp, struct sio_txn *sio);
 int vfs_getattr(struct vnode *vp, struct vattr *vattr);
 
+uint64_t sys_mount(struct syscall_args *args);
+
 #endif /* defined(_KERNEL) */
 
 #endif  /* !_SYS_VFS_H_ */
diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c
index 0461977..9faa5af 100644
--- a/sys/kern/kern_syscall.c
+++ b/sys/kern/kern_syscall.c
@@ -34,6 +34,7 @@
 #include <sys/filedesc.h>
 #include <sys/system.h>
 #include <sys/exec.h>
+#include <sys/vfs.h>
 #include <vm/map.h>
 
 uint64_t(*g_syscall_table[__MAX_SYSCALLS])(struct syscall_args *args) = {
@@ -47,4 +48,5 @@ uint64_t(*g_syscall_table[__MAX_SYSCALLS])(struct syscall_args *args) = {
     sys_munmap,
     sys_ioctl,
     sys_execv,
+    sys_mount
 };
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
index 84985bf..25ad17d 100644
--- a/sys/kern/vfs_mount.c
+++ b/sys/kern/vfs_mount.c
@@ -34,6 +34,7 @@
 #include <sys/errno.h>
 #include <vm/dynalloc.h>
 #include <assert.h>
+#include <string.h>
 
 /* TODO: Make this more flexible */
 #define MOUNTLIST_SIZE 8
@@ -60,6 +61,49 @@ vfs_create_mp(const char *path, int mntflags, struct mount **mp_out)
     return 0;
 }
 
+static int
+mount(const char *source, const char *target, const char *filesystemtype,
+      unsigned long mountflags, const void *data)
+{
+    struct fs_info *info;
+    int status;
+
+    if (source == NULL || target == NULL || filesystemtype == NULL)
+        return -EFAULT;
+
+    /*
+     * Check mount flags.
+     *
+     * XXX: No flags implemented yet.
+     */
+    if (mountflags != 0)
+        return -EINVAL;
+
+    /*
+     * Locate source.
+     *
+     * XXX: Only "none" is currently supported.
+     */
+    if (strcmp(source, "none") != 0)
+        return -ENOENT;
+
+    /* Locate filesystem */
+    info = vfs_byname(filesystemtype);
+    if (info == NULL)
+        return -ENODEV;
+
+    /* Create mount point */
+    status = vfs_mount(target, 0, info);
+    if (status != 0)
+        return status;
+
+    /* Initialize filesystem if needed */
+    if (info->vfsops->init != NULL)
+        return info->vfsops->init(info);
+
+    return 0;
+}
+
 /*
  * Mount a mountpoint
  *
@@ -162,3 +206,10 @@ vfs_mount_init(void)
         TAILQ_INIT(&mountlist[i].buckets);
     }
 }
+
+uint64_t
+sys_mount(struct syscall_args *args)
+{
+    return mount((void *)args->arg0, (void *)args->arg1, (void *)args->arg2,
+                 (unsigned long)args->arg3, (void *)args->arg4);
+}
-- 
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