[FS] VFS and mountpoints

kernel/include/string.h

@@ -11,3 +11,6 @@ void *memmove(void *dest, const void *src, size_t n);
 int memcmp(const void *s1, const void *s2, size_t n);
 
 size_t strlen(const char *s);
+int strncmp(const char *s1, const char *s2, size_t n);
+int strcmp(const char *s1, const char *s2);
+char *strdup(const char *s);

kernel/include/vfs.h

@@ -0,0 +1,58 @@
+#pragma once
+#include <stdint.h>
+#include <stddef.h>
+#include <list.h>
+
+typedef struct vfs_node_st * INODE;
+
+typedef struct file_st
+{
+  uint64_t refs;
+  uint64_t type;
+  struct fs_driver_st *driver;
+  void *data;
+} file_t;
+
+typedef struct dirent_st
+{
+  char name[256];
+  file_t *file;
+} dirent_t;
+
+#define FS_FILE 0x1
+#define FS_DIR  0x2
+#define FS_PIPE 0x3
+
+typedef struct fs_driver_st
+{
+  int (*open)(file_t *file, uint64_t flags);
+  int (*close)(file_t *file);
+  size_t (*read)(file_t *file, void *buffer, size_t nbyte, size_t offset);
+  size_t (*write)(file_t *file, void *buffer, size_t nbyte, size_t offset);
+  int (*readdir)(file_t *dir, dirent_t *entry, uint64_t offset);
+} fs_driver_t;
+
+int fs_open(file_t *file, uint64_t flags);
+int fs_close(file_t *file);
+size_t fs_read(file_t *file, void *buffer, size_t nbyte, size_t offset);
+size_t fs_write(file_t *file, void *buffer, size_t nbyte, size_t offset);
+int fs_readdir(file_t *dir, dirent_t *entry, uint64_t offset);
+
+
+struct mountpoint
+{
+ LIST(struct mountpoint, mountpoints);
+ file_t *root;
+ uint64_t path_len;
+ char path[];
+};
+
+file_t *fs_get(file_t *file);
+file_t *fs_put(file_t *file);
+
+LIST(struct mountpoint, mountpoints);
+
+void fs_mount(file_t *root, const char *path);
+void fs_umount(const char *path);
+
+file_t *fs_namef(const char *path);