From 23f12d626f33bf03295ca4c1165155cfacec01ed Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 19 Sep 2025 13:20:40 -0400
Subject: kern: vfs: Add mountpoint lookup helper

Add helper function to lookup mountpoints such as '/'

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/sys/include/sys/mount.h | 11 +++++++++++
 src/sys/os/vfs_mount.c      | 22 ++++++++++++++++++++++
 2 files changed, 33 insertions(+)

(limited to 'src')

diff --git a/src/sys/include/sys/mount.h b/src/sys/include/sys/mount.h
index 3c4d0be..c93eb2b 100644
--- a/src/sys/include/sys/mount.h
+++ b/src/sys/include/sys/mount.h
@@ -117,6 +117,17 @@ struct vfsops {
     int(*mount)(struct fs_info *fip, struct mount_args *margs);
 };
 
+/*
+ * Lookup a mountpoint existing on the system
+ *
+ * @name: Name of mountpoint
+ * @mp_res: Result of mountpoint is written here
+ *
+ * Returns zero on success, otherwise a less than zero
+ * value to indicate failure
+ */
+int mount_lookup(const char *name, struct mount **mp_res);
+
 /*
  * Mount a specific filesystem
  *
diff --git a/src/sys/os/vfs_mount.c b/src/sys/os/vfs_mount.c
index bfb5fc8..8f09096 100644
--- a/src/sys/os/vfs_mount.c
+++ b/src/sys/os/vfs_mount.c
@@ -112,6 +112,28 @@ mount_to(struct mount_args *margs, struct mount **mp_res, int flags)
     return 0;
 }
 
+/*
+ * Lookup a specific mountpoint
+ */
+int
+mount_lookup(const char *name, struct mount **mp_res)
+{
+    struct mount *mp;
+
+    if (name == NULL || mp_res == NULL) {
+        return -EINVAL;
+    }
+
+    TAILQ_FOREACH(mp, &root.list, link) {
+        if (strcmp(mp->name, name) == 0) {
+            *mp_res = mp;
+            return 0;
+        }
+    }
+
+    return -ENOENT;
+}
+
 /*
  * Allocate a new mountpoint
  */
-- 
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