Import hyra expt

1 files changed, 122 insertions, 0 deletions

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
new file mode 100644
index 0000000..04d64e3
--- /dev/null
+++ b/sys/kern/vfs_subr.c
@@ -0,0 +1,122 @@
+/*
+ * 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/vnode.h>
+#include <sys/errno.h>
+#include <sys/mount.h>
+#include <vm/dynalloc.h>
+#include <string.h>
+
+mountlist_t g_mountlist;
+
+int
+vfs_alloc_vnode(struct vnode **res, int type)
+{
+    struct vnode *vp = dynalloc(sizeof(struct vnode));
+
+    if (vp == NULL) {
+        return -ENOMEM;
+    }
+
+    memset(vp, 0, sizeof(*vp));
+    vp->type = type;
+    *res = vp;
+    return 0;
+}
+
+/*
+ * Allocate a mount structure.
+ *
+ * @vp: Vnode this mount structure covers.
+ * @fip: File system information.
+ */
+struct mount *
+vfs_alloc_mount(struct vnode *vp, struct fs_info *fip)
+{
+    struct mount *mp;
+
+    mp = dynalloc(sizeof(*mp));
+
+    if (mp == NULL) {
+        return NULL;
+    }
+
+    memset(mp, 0, sizeof(*mp));
+    mp->vp = vp;
+    mp->mnt_ops = fip->vfsops;
+    return mp;
+}
+
+/*
+ * Release a vnode and its resources from
+ * memory.
+ */
+int
+vfs_release_vnode(struct vnode *vp)
+{
+    const struct vops *vops = vp->vops;
+    int status = 0;
+
+    if (vp == NULL) {
+        return -EINVAL;
+    }
+
+    if (vops->reclaim != NULL) {
+        status = vops->reclaim(vp);
+    }
+
+    dynfree(vp);
+    return status;
+}
+
+int
+vfs_vop_lookup(struct vnode *vp, struct vop_lookup_args *args)
+{
+    const struct vops *vops = vp->vops;
+
+    if (vops == NULL)
+        return -EIO;
+    if (vops->lookup == NULL)
+        return -EIO;
+
+    return vops->lookup(args);
+}
+
+int
+vfs_vop_read(struct vnode *vp, struct sio_txn *sio)
+{
+    const struct vops *vops = vp->vops;
+
+    if (vops == NULL)
+        return -EIO;
+    if (vops->read == NULL)
+        return -EIO;
+
+    return vops->read(vp, sio);
+}