kern: vfs: Add initial vfsops, and mount code

This commit introduces the groundwork for mountpoints, filesystems and
the VFS as a whole. OMAR is now initialized as its own filesystem by the
VFS

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

1 files changed, 79 insertions, 0 deletions

diff --git a/src/sys/os/vfs_init.c b/src/sys/os/vfs_init.c
new file mode 100644
index 0000000..b40b74d
--- /dev/null
+++ b/src/sys/os/vfs_init.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * 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 the project 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/types.h>
+#include <sys/errno.h>
+#include <sys/param.h>
+#include <sys/mount.h>
+#include <os/vfs.h>
+
+/*
+ * The filesystem table
+ */
+static struct fs_info fstab[] = {
+    { MOUNT_INITRD, &g_omar_vfsops, 0 }
+};
+
+/*
+ * Get entry by index
+ */
+int
+vfs_by_index(uint16_t index, struct fs_info **resp)
+{
+    if (resp == NULL) {
+        return -EINVAL;
+    }
+
+    if (index >= NELEM(fstab)) {
+        return -ENOENT;
+    }
+
+    *resp = &fstab[index];
+    return 0;
+}
+
+int
+vfs_init(void)
+{
+    const struct vfsops *vfsops;
+    struct fs_info *fip;
+    size_t nelem = NELEM(fstab);
+
+    /*
+     * Initialize each filesystem
+     */
+    for (size_t i = 0; i < nelem; ++i) {
+        fip = &fstab[i];
+        vfsops = fip->vfsops;
+        if (vfsops->init != NULL) {
+            vfsops->init(fip);
+        }
+    }
+    return 0;
+}