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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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_H
#define	VFS_H

#include "../public/vfs.h"
#include "acl.h"

#include <cx/string.h>

#ifdef	__cplusplus
extern "C" {
#endif

typedef struct VfsType {
    vfs_init_func      init;
    vfs_create_func    create;
} VfsType;
    
typedef struct SysVFSDir {
    DIR           *dir;
    struct dirent *cur;
} SysVFSDir;

enum VFSAioOp {
    VFS_AIO_READ = 0,
    VFS_AIO_WRITE
};
typedef enum VFSAioOp VFSAioOp;
    
int vfs_init(void);
VfsType* vfs_get_type(cxstring vfs_class);

void* vfs_init_backend(ServerConfiguration *cfg, pool_handle_t *pool, VfsType *vfs_class, WSConfigNode *config, int *error);

typedef int(*vfs_op_f)(VFSContext *, const char *);
typedef int(*sys_op_f)(VFSContext *, const char *, SysACL *);
int vfs_path_op(VFSContext *ctx, const char *path, vfs_op_f op, uint32_t access);

SYS_FILE sys_vfs_open(VFSContext *ctx, const char *path, int oflags);
int sys_vfs_stat(VFSContext *ctx, const char *path, struct stat *buf);
int sys_vfs_fstat(VFSContext *ctx, SYS_FILE fd, struct stat *buf);
VFS_DIR sys_vfs_opendir(VFSContext *ctx, const char *path);
VFS_DIR sys_vfs_fdopendir(VFSContext *ctx, SYS_FILE fd);
int sys_vfs_mkdir(VFSContext *ctx, const char *path);
int sys_vfs_unlink(VFSContext *ctx, const char *path);
int sys_vfs_rmdir(VFSContext *ctx, const char *path);

int sys_path_op(VFSContext *ctx, const char *path, sys_op_f op);
int sys_acl_check(VFSContext *ctx, uint32_t access_mask, SysACL *externacl);
void sys_set_error_status(VFSContext *ctx);

ssize_t sys_file_read(SYS_FILE fd, void *buf, size_t nbyte);
ssize_t sys_file_write(SYS_FILE fd, const void *buf, size_t nbyte);
ssize_t sys_file_pread(SYS_FILE fd, void *buf, size_t nbyte, off_t offset);
ssize_t sys_file_pwrite(SYS_FILE fd, const void *buf, size_t nbyte, off_t offset);
off_t sys_file_seek(SYS_FILE fd, off_t offset, int whence);
void sys_file_close(SYS_FILE fd);
int sys_file_aioread(aiocb_s *aiocb);
int sys_file_aiowrite(aiocb_s *aiocb);

int sys_dir_read(VFS_DIR dir, VFS_ENTRY *entry, int getstat);
void sys_dir_close(VFS_DIR dir);

int sys_mkdir(VFSContext *ctx, const char *path, SysACL *sysacl);
int sys_unlink(VFSContext *ctx, const char *path, SysACL *sysacl);
int sys_rmdir(VFSContext *ctx, const char *path, SysACL *sysacl);

void vfs_queue_aio(aiocb_s *aiocb, VFSAioOp op);

#ifdef	__cplusplus
}
#endif

#endif	/* VFS_H */