vfs.h

/*
 * 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.
 */

#ifndef VFS_VFS_H_
#define VFS_VFS_H_

#include <async.h>
#include <adt/list.h>
#include <fibril_synch.h>
#include <sys/types.h>
#include <devmap.h>
#include <bool.h>
#include <ipc/vfs.h>

#ifndef dprintf
        #define dprintf(...)
#endif

typedef struct {
        link_t fs_link;
        vfs_info_t vfs_info;
        fs_handle_t fs_handle;
        async_sess_t session;
} fs_info_t;

#define VFS_PAIR \
        fs_handle_t fs_handle; \
        devmap_handle_t devmap_handle;

#define VFS_TRIPLET \
        VFS_PAIR; \
        fs_index_t index;

typedef struct {
        VFS_PAIR;
} vfs_pair_t;

typedef struct {
        VFS_TRIPLET;
} vfs_triplet_t;

typedef enum vfs_node_type {
        VFS_NODE_UNKNOWN,
        VFS_NODE_FILE,
        VFS_NODE_DIRECTORY,
} vfs_node_type_t;

typedef struct {
        vfs_triplet_t triplet;
        vfs_node_type_t type;
        aoff64_t size;
        unsigned int lnkcnt;
} vfs_lookup_res_t;

typedef struct {
        VFS_TRIPLET;            
        unsigned refcnt;
        
        unsigned lnkcnt;

        link_t nh_link;         
        vfs_node_type_t type;   
        aoff64_t size;          
        fibril_rwlock_t contents_rwlock;
} vfs_node_t;

typedef struct {
        fibril_mutex_t lock;

        vfs_node_t *node;
        
        unsigned refcnt;

        bool append;

        aoff64_t pos;
} vfs_file_t;

extern fibril_mutex_t nodes_mutex;

extern fibril_condvar_t fs_head_cv;
extern fibril_mutex_t fs_head_lock;
extern link_t fs_head;          
extern vfs_pair_t rootfs;       
typedef struct {
        link_t  plb_link;       
        unsigned index;         
        size_t len;             
} plb_entry_t;

extern fibril_mutex_t plb_mutex;
extern uint8_t *plb;            
extern link_t plb_head;         
#define MAX_MNTOPTS_LEN         256

extern fibril_rwlock_t namespace_rwlock;

extern int vfs_grab_phone(fs_handle_t);
extern void vfs_release_phone(fs_handle_t, int);

extern fs_handle_t fs_name_to_handle(char *, bool);
extern vfs_info_t *fs_handle_to_info(fs_handle_t);

extern int vfs_lookup_internal(char *, int, vfs_lookup_res_t *,
    vfs_pair_t *, ...);
extern int vfs_open_node_internal(vfs_lookup_res_t *);

extern bool vfs_nodes_init(void);
extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
extern void vfs_node_put(vfs_node_t *);
extern void vfs_node_forget(vfs_node_t *);
extern unsigned vfs_nodes_refcount_sum_get(fs_handle_t, devmap_handle_t);


#define MAX_OPEN_FILES  128

extern void *vfs_client_data_create(void);
extern void vfs_client_data_destroy(void *);

extern vfs_file_t *vfs_file_get(int);
extern void vfs_file_put(vfs_file_t *);
extern int vfs_fd_assign(vfs_file_t *, int);
extern int vfs_fd_alloc(bool desc);
extern int vfs_fd_free(int);

extern void vfs_node_addref(vfs_node_t *);
extern void vfs_node_delref(vfs_node_t *);

extern void vfs_register(ipc_callid_t, ipc_call_t *);
extern void vfs_mount(ipc_callid_t, ipc_call_t *);
extern void vfs_unmount(ipc_callid_t, ipc_call_t *);
extern void vfs_open(ipc_callid_t, ipc_call_t *);
extern void vfs_open_node(ipc_callid_t, ipc_call_t *);
extern void vfs_sync(ipc_callid_t, ipc_call_t *);
extern void vfs_dup(ipc_callid_t, ipc_call_t *);
extern void vfs_close(ipc_callid_t, ipc_call_t *);
extern void vfs_read(ipc_callid_t, ipc_call_t *);
extern void vfs_write(ipc_callid_t, ipc_call_t *);
extern void vfs_seek(ipc_callid_t, ipc_call_t *);
extern void vfs_truncate(ipc_callid_t, ipc_call_t *);
extern void vfs_fstat(ipc_callid_t, ipc_call_t *);
extern void vfs_stat(ipc_callid_t, ipc_call_t *);
extern void vfs_mkdir(ipc_callid_t, ipc_call_t *);
extern void vfs_unlink(ipc_callid_t, ipc_call_t *);
extern void vfs_rename(ipc_callid_t, ipc_call_t *);

#endif

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