kernel: Add initial VFS implementation

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 78 insertions, 0 deletions

diff --git a/sys/kern/vfs_init.c b/sys/kern/vfs_init.c
new file mode 100644
index 0000000..bcda0dd
--- /dev/null
+++ b/sys/kern/vfs_init.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/vfs.h>
+#include <sys/cdefs.h>
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <fs/initramfs.h>
+#include <assert.h>
+#include <string.h>
+
+__MODULE_NAME("vfs");
+__KERNEL_META("$Hyra$: vfs.c, Ian Marco Moffett, "
+              "Hyra Virtual File System");
+
+struct fs_info filesystems[] = {
+    { "initramfs", &g_initramfs_ops }
+};
+
+struct fs_info *
+vfs_byname(const char *name)
+{
+    for (int i = 0; i < __ARRAY_COUNT(filesystems); ++i) {
+        if (strcmp(filesystems[i].name, name) == 0) {
+            return &filesystems[i];
+        }
+    }
+
+    return NULL;
+}
+
+void
+vfs_init(void)
+{
+    struct fs_info *info;
+    struct vfsops *vfsops;
+
+    vfs_init_cache();
+
+    for (int i = 0; i < __ARRAY_COUNT(filesystems); ++i) {
+        info = &filesystems[i];
+        vfsops = info->vfsops;
+
+        __assert(vfsops->init != NULL);
+        vfsops->init(info);
+
+        if (strcmp(info->name, "initramfs") == 0) {
+            /* Initramfs must be mounted */
+            vfs_mount(&info->mp_root, "/ramdisk", MNT_RDONLY);
+        }
+    }
+}