source: mainline/uspace/srv/fs/tmpfs/tmpfs.h@ 46577995

/*
 * Copyright (c) 2008 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 fs
 * @{
 */

#ifndef TMPFS_TMPFS_H_
#define TMPFS_TMPFS_H_

#include <libfs.h>
#include <atomic.h>
#include <stddef.h>
#include <stdbool.h>
#include <adt/hash_table.h>

#define TMPFS_NODE(node)        ((node) ? (tmpfs_node_t *)(node)->data : NULL)
#define FS_NODE(node)           ((node) ? (node)->bp : NULL)

typedef enum {
        TMPFS_NONE,
        TMPFS_FILE,
        TMPFS_DIRECTORY
} tmpfs_dentry_type_t;

/* forward declaration */
struct tmpfs_node;

typedef struct tmpfs_dentry {
        link_t link;            /**< Linkage for the list of siblings. */
        struct tmpfs_node *node;/**< Back pointer to TMPFS node. */
        char *name;             /**< Name of dentry. */
} tmpfs_dentry_t;

typedef struct tmpfs_node {
        fs_node_t *bp;          /**< Back pointer to the FS node. */
        fs_index_t index;       /**< TMPFS node index. */
        service_id_t service_id;/**< Service ID of block device. */
        ht_link_t nh_link;              /**< Nodes hash table link. */
        tmpfs_dentry_type_t type;
        unsigned lnkcnt;        /**< Link count. */
        size_t size;            /**< File size if type is TMPFS_FILE. */
        void *data;             /**< File content's if type is TMPFS_FILE. */
        list_t cs_list;         /**< Child's siblings list. */
} tmpfs_node_t;

extern vfs_out_ops_t tmpfs_ops;
extern libfs_ops_t tmpfs_libfs_ops;

extern bool tmpfs_init(void);
extern bool tmpfs_restore(service_id_t);

#endif

/**
 * @}
 */