kern: Add initial virtual file system sources

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

1 files changed, 108 insertions, 0 deletions

diff --git a/sys/kern/vfs_init.c b/sys/kern/vfs_init.c
new file mode 100644
index 0000000..2f282cf
--- /dev/null
+++ b/sys/kern/vfs_init.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2025 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/types.h>
+#include <sys/errno.h>
+#include <sys/param.h>
+#include <sys/cdefs.h>
+#include <lib/string.h>
+#include <fs/tmpfs.h>
+#include <os/mount.h>
+#include <os/trace.h>
+#include <os/vfs.h>
+
+#define dtrace(fmt, ...) trace("vfs: " fmt, ##__VA_ARGS__)
+
+static uint16_t fs_count = 0;
+static struct fs_info fs_list[] = {
+    { MOUNT_TMPFS, &g_tmpfs_ops }
+};
+
+int
+vfs_byname(const char *name, struct fs_info **res)
+{
+    if (name == NULL || res == NULL) {
+        return -ENOMEM;
+    }
+
+    if (fs_count == 0) {
+        fs_count = NELEM(fs_list);
+    }
+
+    for (uint16_t i = 0; i < fs_count; ++i) {
+        if (__likely(*name != *fs_list[i].name)) {
+            continue;
+        }
+
+        if (strcmp(name, fs_list[i].name) == 0) {
+            *res = &fs_list[i];
+            return 0;
+        }
+    }
+
+    return -ENOENT;
+}
+
+void
+vfs_init(void)
+{
+    struct fs_info *fip;
+    struct vfsops *ops;
+    uint16_t mount_count = 0;
+    int error;
+
+    fs_count = NELEM(fs_list);
+    for (uint16_t i = 0; i < fs_count; ++i) {
+        fip = &fs_list[i];
+        ops = fip->vfsops;
+
+        /* We rely on the name */
+        if (__unlikely(fip->name == NULL)) {
+            continue;
+        }
+
+        /* Mount if we can */
+        if (ops->mount != NULL) {
+            error = ops->mount(fip, NULL);
+        }
+
+        if (error != 0) {
+            dtrace("failed to mount %s\n", fip->name);
+            continue;
+        }
+
+        dtrace("mounted %s\n", fip->name);
+        fip->is_mounted = 1;
+        ++mount_count;
+    }
+
+    if (mount_count > 0) {
+        dtrace("mounted %d filesystem(s)\n", mount_count);
+    }
+}