source: mainline/uspace/lib/libfs/libfs.h@ aadf01e

/*
 * Copyright (c) 2009 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libfs
 * @{
 */
/**
 * @file
 */

#ifndef LIBFS_LIBFS_H_
#define LIBFS_LIBFS_H_

#include <ipc/vfs.h>
#include <stdint.h>
#include <ipc/ipc.h>
#include <async.h>
#include <devmap.h>

typedef struct {
        bool mp_active;
        int phone;
        fs_handle_t fs_handle;
        dev_handle_t dev_handle;
} mp_data_t;

typedef struct {
        mp_data_t mp_data;  /**< Mount point info. */
        void *data;         /**< Data of the file system implementation. */
} fs_node_t;

typedef struct {
        /*
         * The first set of methods are functions that return an integer error
         * code. If some additional return value is to be returned, the first
         * argument holds the output argument.
         */
        int (* root_get)(fs_node_t **, dev_handle_t);
        int (* match)(fs_node_t **, fs_node_t *, const char *);
        int (* node_get)(fs_node_t **, dev_handle_t, fs_index_t);
        int (* node_open)(fs_node_t *);
        int (* node_put)(fs_node_t *);
        int (* create)(fs_node_t **, dev_handle_t, int);
        int (* destroy)(fs_node_t *);
        int (* link)(fs_node_t *, fs_node_t *, const char *);
        int (* unlink)(fs_node_t *, fs_node_t *, const char *);
        int (* has_children)(bool *, fs_node_t *);
        /*
         * The second set of methods are usually mere getters that do not return
         * an integer error code.
         */
        fs_index_t (* index_get)(fs_node_t *);
        aoff64_t (* size_get)(fs_node_t *);
        unsigned int (* lnkcnt_get)(fs_node_t *);
        char (* plb_get_char)(unsigned pos);
        bool (* is_directory)(fs_node_t *);
        bool (* is_file)(fs_node_t *);
        dev_handle_t (* device_get)(fs_node_t *);
} libfs_ops_t;

typedef struct {
        int fs_handle;           /**< File system handle. */
        ipcarg_t vfs_phonehash;  /**< Initial VFS phonehash. */
        uint8_t *plb_ro;         /**< Read-only PLB view. */
} fs_reg_t;

extern int fs_register(int, fs_reg_t *, vfs_info_t *, async_client_conn_t);

extern void fs_node_initialize(fs_node_t *);

extern void libfs_mount(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *);
extern void libfs_unmount(libfs_ops_t *, ipc_callid_t, ipc_call_t *);
extern void libfs_lookup(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *);
extern void libfs_stat(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *);
extern void libfs_open_node(libfs_ops_t *, fs_handle_t, ipc_callid_t,
    ipc_call_t *);

#endif

/** @}
 */