kern: vfs: Add lookup by name helper

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

2 files changed, 37 insertions, 0 deletions

diff --git a/src/sys/include/os/vfs.h b/src/sys/include/os/vfs.h
index a46bb18..e08a9f0 100644
--- a/src/sys/include/os/vfs.h
+++ b/src/sys/include/os/vfs.h
@@ -43,6 +43,17 @@
 int vfs_init(void);
 
 /*
+ * Get a VFS file table entry by name
+ *
+ * @name: Name of desired entry
+ * @resp: Result pointer is written here
+ *
+ * Returns zero on success, otherwise a less than zero
+ * value upon failure.
+ */
+int vfs_by_name(const char *name, struct fs_info **resp);
+
+/*
  * Get a VFS file table entry by index.
  *
  * @index: Index to desired entry
diff --git a/src/sys/os/vfs_init.c b/src/sys/os/vfs_init.c
index b40b74d..496fb67 100644
--- a/src/sys/os/vfs_init.c
+++ b/src/sys/os/vfs_init.c
@@ -32,6 +32,7 @@
 #include <sys/param.h>
 #include <sys/mount.h>
 #include <os/vfs.h>
+#include <string.h>
 
 /*
  * The filesystem table
@@ -41,6 +42,31 @@ static struct fs_info fstab[] = {
 };
 
 /*
+ * Get entry by name
+ */
+int
+vfs_by_name(const char *name, struct fs_info **resp)
+{
+    size_t nelem;
+    int retval = -ENOENT;
+
+    if (name == NULL || resp == NULL) {
+        return -EINVAL;
+    }
+
+    nelem = NELEM(fstab);
+    for (int i = 0; i < nelem; ++i) {
+        if (strcmp(fstab[i].name, name) == 0) {
+            *resp = &fstab[i];
+            retval = 0;
+            break;
+        }
+    }
+
+    return retval;
+}
+
+/*
  * Get entry by index
  */
 int