kern: vfs: Add mountpoint lookup helper

Add helper function to lookup mountpoints such as '/'

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

2 files changed, 33 insertions, 0 deletions

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
@@ -118,6 +118,17 @@ struct vfsops {
 };
 
 /*
+ * 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
  *
  * @margs: Mount arguments
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
@@ -113,6 +113,28 @@ mount_to(struct mount_args *margs, struct mount **mp_res, int flags)
 }
 
 /*
+ * 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
  */
 int