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/*

 * Copyright (c) 2005-2007, Kohsuke Ohtani

 * 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.

 * 3. Neither the name of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h>

#include <sys/prex.h>

#include <sys/vnode.h>

#include <sys/file.h>

#include <sys/mount.h>

#include <sys/dirent.h>

#include <assert.h>

/* #define DEBUG_VFS 1 */

/*

 * Tunable parameters

 */

#define FSMAXNAMES        16                /* max length of 'file system' name */

#ifdef DEBUG_VFS

extern int vfs_debug;

#define        VFSDB_CORE        0x00000001

#define        VFSDB_SYSCALL        0x00000002

#define        VFSDB_VNODE        0x00000004

#define        VFSDB_BIO        0x00000008

#define        VFSDB_CAP        0x00000010

#define VFSDB_FLAGS        0x00000013

#define        DPRINTF(_m,X)        if (vfs_debug & (_m)) dprintf X

#define ASSERT(e)        dassert(e)

#else

#define        DPRINTF(_m, X)

#define ASSERT(e)

#endif

#if CONFIG_FS_THREADS > 1

#define malloc(s)                malloc_r(s)

#define free(p)                        free_r(p)

#else

#define mutex_init(m)                do {} while (0)

#define mutex_destroy(m)        do {} while (0)

#define mutex_lock(m)                do {} while (0)

#define mutex_unlock(m)                do {} while (0)

#define mutex_trylock(m)        do {} while (0)

#endif

/*

 * per task data

 */

struct task {

        struct list t_link;                /* hash link */

        task_t            t_taskid;                /* task id */

        char             t_cwd[PATH_MAX];        /* current working directory */

        file_t            t_cwdfp;                /* directory for cwd */

        file_t            t_ofile[NOFILE];        /* pointers to file structures of open files */

        int            t_nopens;                /* number of opening files */

        mutex_t            t_lock;                /* lock for this task */

};

extern const struct vfssw vfssw[];

__BEGIN_DECLS

int         sys_open(char *path, int flags, mode_t mode, file_t *pfp);

int         sys_close(file_t fp);

int         sys_read(file_t fp, void *buf, size_t size, size_t *result);

int         sys_write(file_t fp, void *buf, size_t size, size_t *result);

int         sys_lseek(file_t fp, off_t off, int type, off_t * cur_off);

int         sys_ioctl(file_t fp, u_long request, void *buf);

int         sys_fstat(file_t fp, struct stat *st);

int         sys_fsync(file_t fp);

int         sys_ftruncate(file_t fp, off_t length);

int         sys_opendir(char *path, file_t * file);

int         sys_closedir(file_t fp);

int         sys_readdir(file_t fp, struct dirent *dirent);

int         sys_rewinddir(file_t fp);

int         sys_seekdir(file_t fp, long loc);

int         sys_telldir(file_t fp, long *loc);

int         sys_fchdir(file_t fp, char *path);

int         sys_mkdir(char *path, mode_t mode);

int         sys_rmdir(char *path);

int         sys_mknod(char *path, mode_t mode);

int         sys_rename(char *src, char *dest);

int         sys_unlink(char *path);

int         sys_access(char *path, int mode);

int         sys_stat(char *path, struct stat *st);

int         sys_truncate(char *path, off_t length);

int         sys_mount(char *dev, char *dir, char *fsname, int flags, void *data);

int         sys_umount(char *path);

int         sys_sync(void);

struct task *task_lookup(task_t task);

int         task_alloc(task_t task, struct task **pt);

void         task_free(struct task *t);

void         task_setid(struct task *t, task_t task);

void         task_unlock(struct task *t);

file_t         task_getfp(struct task *t, int fd);

void         task_setfp(struct task *t, int fd, file_t fp);

int         task_newfd(struct task *t);

void         task_delfd(struct task *t, int fd);

int         task_conv(struct task *t, char *path, int mode, char *full);

void         task_init(void);

int         sec_file_permission(task_t task, char *path, int mode);

int         sec_vnode_permission(char *path);

int         namei(char *path, vnode_t *vpp);

int         lookup(char *path, vnode_t *vpp, char **name);

void         vnode_init(void);

int         vfs_findroot(char *path, mount_t *mp, char **root);

void         vfs_busy(mount_t mp);

void         vfs_unbusy(mount_t mp);

int         fs_noop(void);

#ifdef DEBUG_VFS

void         task_dump(void);

void         vnode_dump(void);

void         mount_dump(void);

#endif

__END_DECLS

#endif /* !_VFS_H */