source: mainline/uspace/srv/fs/minixfs/mfs.h@ 127d999

/*
 * Copyright (c) 2011 Maurizio Lombardi
 * 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 _MFS_H_
#define _MFS_H_

#include <minix.h>
#include <macros.h>
#include <libblock.h>
#include <libfs.h>
#include <adt/list.h>
#include "../../vfs/vfs.h"

#define NAME            "mfs"

#define DEBUG_MODE

#define min(a, b)       ((a) < (b) ? (a) : (b))

#ifdef DEBUG_MODE
#define mfsdebug(...)   printf(__VA_ARGS__)
#else
#define mfsdebug(...)
#endif

#ifdef _MAIN
#define GLOBAL
#else
#define GLOBAL extern
#endif

GLOBAL fs_reg_t mfs_reg;

typedef uint32_t bitchunk_t;

typedef enum {
        BMAP_ZONE,
        BMAP_INODE
} bmap_id_t;

typedef enum {
        MFS_VERSION_V1 = 1,
        MFS_VERSION_V2,
        MFS_VERSION_V3
} mfs_version_t;

/*Generic MinixFS superblock*/
struct mfs_sb_info {
        uint32_t ninodes;
        uint32_t nzones;
        unsigned long ibmap_blocks;
        unsigned long zbmap_blocks;
        unsigned long firstdatazone;
        int log2_zone_size;
        int block_size;
        uint32_t max_file_size;
        uint16_t magic;
        uint16_t state;

        /*The following fields do not exist on disk but only in memory*/
        unsigned long itable_size;
        mfs_version_t fs_version;
        int ino_per_block;
        size_t dirsize;
        int itable_off;
        unsigned max_name_len;
        bool long_names;
        bool native;
        unsigned isearch;
        unsigned zsearch;
};

/*Generic MinixFS inode*/
struct mfs_ino_info {
        uint16_t        i_mode;
        uint16_t        i_nlinks;
        int16_t         i_uid;
        uint16_t        i_gid;
        size_t          i_size;
        int32_t         i_atime;
        int32_t         i_mtime;
        int32_t         i_ctime;
        /*Block numbers for direct zones*/
        uint32_t        i_dzone[V2_NR_DIRECT_ZONES];
        /*Block numbers for indirect zones*/
        uint32_t        i_izone[V2_NR_INDIRECT_ZONES];

        /*The following fields do not exist on disk but only in memory*/
        bool dirty;
        fs_index_t index;
};

/*Generic MFS directory entry*/
struct mfs_dentry_info {
        uint32_t d_inum;
        char d_name[MFS3_MAX_NAME_LEN + 1];

        /*The following fields do not exist on disk but only in memory*/

        /*Index of the dentry in the list*/
        unsigned index;
        /*Pointer to the node at witch the dentry belongs*/
        struct mfs_node *node;
};

struct mfs_instance {
        link_t link;
        devmap_handle_t handle;
        struct mfs_sb_info *sbi;
};

/*MinixFS node in core*/
struct mfs_node {
        struct mfs_ino_info *ino_i;
        struct mfs_instance *instance;
};

/*mfs_ops.c*/
extern void mfs_mounted(ipc_callid_t rid, ipc_call_t *request);
extern void mfs_mount(ipc_callid_t rid, ipc_call_t *request);
extern void mfs_lookup(ipc_callid_t rid, ipc_call_t *request);
extern int mfs_instance_get(devmap_handle_t handle,
                                struct mfs_instance **instance);

extern void mfs_stat(ipc_callid_t rid, ipc_call_t *request);
extern void mfs_close(ipc_callid_t rid, ipc_call_t *request);
extern void mfs_open_node(ipc_callid_t rid, ipc_call_t *request);

extern void
mfs_read(ipc_callid_t rid, ipc_call_t *request);


/*mfs_inode.c*/
int
get_inode(struct mfs_instance *inst, struct mfs_ino_info **ino_i,
                                fs_index_t index);

extern int
put_inode(struct mfs_node *mnode);

int
inode_grow(struct mfs_node *mnode, size_t size_grow);

/*mfs_rw.c*/
extern int
read_map(uint32_t *b, const struct mfs_node *mnode, const uint32_t pos);

extern int
write_map(struct mfs_node *mnode, uint32_t pos, uint32_t new_zone,
                                uint32_t *old_zone);

extern int
free_zone(struct mfs_node *mnode, const uint32_t zone);

/*mfs_dentry.c*/
extern int
read_directory_entry(struct mfs_node *mnode,
                        struct mfs_dentry_info **d_info, unsigned index);

extern int
write_dentry(struct mfs_dentry_info *d_info);

int
insert_dentry(struct mfs_node *mnode, const char *d_name, fs_index_t d_inum);

/*mfs_balloc.c*/
extern int
mfs_alloc_bit(struct mfs_instance *inst, uint32_t *idx, bmap_id_t bid);

extern int
mfs_free_bit(struct mfs_instance *inst, uint32_t idx, bmap_id_t bid);

#endif

/**
 * @}
 */