FileID: implement `FileID` struct

`FileID` should encapsulate `st_dev` and `st_ino`. It is a new abstraction
used to check if two files are the same. `FileID`s will be embeded inside
other struts like `buf_t` or `ff_visited_T`, where a full `FileInfo` would be
to big.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/nvim/os/fs_defs.h b/src/nvim/os/fs_defs.h
new file mode 100644
index 0000000000..ab4c05b965
--- /dev/null
+++ b/src/nvim/os/fs_defs.h
@@ -0,0 +1,19 @@
+#ifndef NVIM_OS_FS_DEFS_H
+#define NVIM_OS_FS_DEFS_H
+
+#include <uv.h>
+
+/// Struct which encapsulates stat information.
+typedef struct {
+  uv_stat_t stat;  ///< @private
+} FileInfo;
+
+/// Struct which encapsulates inode/dev_id information.
+typedef struct {
+  uint64_t inode;      ///< @private The inode of the file
+  uint64_t device_id;  ///< @private The id of the device containing the file
+} FileID;
+
+#define FILE_ID_EMPTY (FileID){.inode = 0, .device_id = 0}
+
+#endif  // NVIM_OS_FS_DEFS_H