From b0af158b666cf58bbdc6c6a73328052be43d99bf Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 11 Jul 2024 21:30:28 -0400
Subject: kernel: vfs: Implement mountpoint naming

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/sys/mount.h |  4 ++++
 sys/kern/vfs_subr.c     | 23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+)

(limited to 'sys')

diff --git a/sys/include/sys/mount.h b/sys/include/sys/mount.h
index e46cda9..e12b880 100644
--- a/sys/include/sys/mount.h
+++ b/sys/include/sys/mount.h
@@ -39,6 +39,7 @@
 #if defined(_KERNEL)
 
 #define FS_NAME_MAX 16  /* Length of fs name including nul */
+#define NAME_MAX 256    /* Max name of filename (not including nul) */
 
 /*
  * Filesystem types.
@@ -56,6 +57,7 @@ extern mountlist_t g_mountlist;
 extern const struct vfsops g_initramfs_vfsops;
 
 struct mount {
+    char *name;
     struct spinlock lock;
     struct vnode *vp;
     const struct vfsops *mnt_ops;
@@ -77,6 +79,8 @@ struct vfsops {
 };
 
 void vfs_init(void);
+int vfs_name_mount(struct mount *mp, const char *name);
+
 struct mount *vfs_alloc_mount(struct vnode *vp, struct fs_info *fip);
 struct fs_info *vfs_byname(const char *name);
 
diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 0d4be72..cbcf7c5 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -73,6 +73,29 @@ vfs_alloc_mount(struct vnode *vp, struct fs_info *fip)
     return mp;
 }
 
+/*
+ * Assign a name to a mountpoint.
+ *
+ * @mp: Mountpoint to name.
+ * @name: Name to give.
+ */
+int
+vfs_name_mount(struct mount *mp, const char *name)
+{
+    size_t name_len = strlen(name);
+
+    if (name_len > NAME_MAX)
+        return -ENAMETOOLONG;
+
+    mp->name = dynalloc(sizeof(char) * name_len + 1);
+    if (mp->name == NULL)
+        return -ENOMEM;
+
+    memcpy(mp->name, name, name_len);
+    mp->name[name_len] = '\0';
+    return 0;
+}
+
 /*
  * Release a vnode and its resources from
  * memory.
-- 
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