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#define VFS_FIRST   IPC_FIRST_USER_METHOD
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#define VFS_FIRST   IPC_FIRST_USER_METHOD
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#define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)  
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#define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)  
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/* Basic types. */
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typedef int16_t fs_handle_t;
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typedef int16_t dev_handle_t;
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typedef uint32_t fs_index_t;
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typedef enum {
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typedef enum {
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    VFS_READ = VFS_FIRST,
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    VFS_READ = VFS_FIRST,
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    VFS_WRITE,
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    VFS_WRITE,
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    VFS_TRUNCATE,
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    VFS_TRUNCATE,
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    VFS_MOUNT,
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    VFS_MOUNT,
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 * A structure like this will be allocated for each registered file system.
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 * A structure like this will be allocated for each registered file system.
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 */
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 */
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typedef struct {
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typedef struct {
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    link_t fs_link;
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    link_t fs_link;
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    vfs_info_t vfs_info;
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    vfs_info_t vfs_info;
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    int fs_handle;
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    fs_handle_t fs_handle;
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    futex_t phone_futex;    /**< Phone serializing futex. */
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    futex_t phone_futex;    /**< Phone serializing futex. */
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    ipcarg_t phone;
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    ipcarg_t phone;
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} fs_info_t;
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} fs_info_t;
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/**
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/**
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 * VFS_PAIR uniquely represents a file system instance.
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 * VFS_PAIR uniquely represents a file system instance.
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 */
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 */
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#define VFS_PAIR    \
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#define VFS_PAIR        \
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    int fs_handle;  \
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    fs_handle_t fs_handle;  \
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    int dev_handle;
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    dev_handle_t dev_handle;
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/**
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/**
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 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
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 * VFS_TRIPLET uniquely identifies a file system node (e.g. directory, file) but
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 * doesn't contain any state. For a stateful structure, see vfs_node_t.
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 * doesn't contain any state. For a stateful structure, see vfs_node_t.
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 *
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 *
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 * @note    fs_handle, dev_handle and index are meant to be returned in one
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 * @note    fs_handle, dev_handle and index are meant to be returned in one
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 *      IPC reply.
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 *      IPC reply.
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 */
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 */
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#define VFS_TRIPLET \
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#define VFS_TRIPLET \
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    VFS_PAIR;   \
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    VFS_PAIR;   \
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    uint64_t index;
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    fs_index_t index;
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typedef struct {
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typedef struct {
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    VFS_PAIR;
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    VFS_PAIR;
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} vfs_pair_t;
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} vfs_pair_t;
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extern link_t plb_head;     /**< List of active PLB entries. */
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extern link_t plb_head;     /**< List of active PLB entries. */
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/** Holding this rwlock prevents changes in file system namespace. */
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/** Holding this rwlock prevents changes in file system namespace. */
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extern rwlock_t namespace_rwlock;
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extern rwlock_t namespace_rwlock;
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extern int vfs_grab_phone(int);
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extern int vfs_grab_phone(fs_handle_t);
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extern void vfs_release_phone(int);
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extern void vfs_release_phone(int);
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extern int fs_name_to_handle(char *, bool);
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extern fs_handle_t fs_name_to_handle(char *, bool);
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extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *, vfs_pair_t *,
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extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *, vfs_pair_t *,
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    ...);
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    ...);
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extern bool vfs_nodes_init(void);
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extern bool vfs_nodes_init(void);