1 files changed, 28 insertions, 0 deletions
diff --git a/fs.h b/fs.h
new file mode 100644
index 0000000..b710e1c
--- /dev/null
+++ b/fs.h
@@ -0,0 +1,28 @@
+// on-disk file system format
+
+// second sector
+struct superblock{
+  int nblocks;
+  int ninodes;
+};
+
+#define NDIRECT 14
+
+// inodes start at the third sector
+// and blocks start at (ninodes * sizeof(dinode) + 511) / 512
+struct dinode {
+  short type;
+  short nlink;
+  uint size;
+  uint addrs[NDIRECT];
+};
+#define T_DIR 1
+#define T_FILE 2
+
+#define IPB (512 / sizeof(struct dinode))
+
+struct dirent {
+  ushort inum;
+  char name[14];
+};
+