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/*
* Mach Operating System
* Copyright (c) 1987 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*
* HISTORY
* 7-Jan-93 Mac Gillon (mgillon) at NeXT
* Integrate POSIX support
*
* 27-Sep-89 Morris Meyer (mmeyer) at NeXT
* NFS 4.0 Changes.
*/
#ifndef VFS_H
#define VFS_H
#if !defined(_MAXNAMLEN)
#define _MAXNAMLEN
#define MAXNAMLEN 255
#endif /* _MAXNAMLEN */
/* @(#)vfs.h 2.2 88/05/25 4.0NFSSRC SMI; from vfs.h 2.15 87/01/14 SMI */
/*
* File system identifier. Should be unique (at least per machine).
*/
typedef struct {
long val[2]; /* file system id type */
} fsid_t;
/*
* File identifier. Should be unique per filesystem on a single machine.
*/
#define MAXFIDSZ 16
#define freefid(fidp) \
kfree((caddr_t)(fidp), sizeof (struct fid) - MAXFIDSZ + (fidp)->fid_len)
struct fid {
u_short fid_len; /* length of data in bytes */
char fid_data[MAXFIDSZ]; /* data (variable length) */
};
/*
* Structure per mounted file system.
* Each mounted file system has an array of
* operations and an instance record.
* The file systems are put on a singly linked list.
*/
struct vfs {
struct vfs *vfs_next; /* next vfs in vfs list */
struct vfsops *vfs_op; /* operations on vfs */
struct vnode *vfs_vnodecovered; /* vnode we mounted on */
int vfs_flag; /* flags */
int vfs_bsize; /* native block size */
fsid_t vfs_fsid; /* file system id */
caddr_t vfs_stats; /* filesystem statistics */
char vfs_name[MAXNAMLEN+1]; /* name if faking dir entry */
struct vfs *vfs_nextentry; /* next fake entry in vnode */
uid_t vfs_uid; /* user who mounted this */
caddr_t vfs_data; /* private data */
};
/*
* vfs flags.
* VFS_MLOCK lock the vfs so that name lookup cannot proceed past the vfs.
* This keeps the subtree stable during mounts and unmounts.
*/
#define VFS_RDONLY 0x01 /* read only vfs */
#define VFS_MLOCK 0x02 /* lock vfs so that subtree is stable */
#define VFS_MWAIT 0x04 /* someone is waiting for lock */
#define VFS_NOSUID 0x08 /* turn off set-uid on exec */
#if NeXT
/*
* For now, just overload NOSUID bit, since we don't want to change
* mount command, etc. When this gets its own bit, we'll have to
* edit sys/mount.h to add M_NODEV and mntent.h to add MNTOPT_NODEV
* along with hacking all the appropriate programs.
*/
#define VFS_NODEV VFS_NOSUID /* no access to blk and char dev */
#endif
#define VFS_GRPID 0x10 /* Old BSD group-id on create */
#define VFS_NOSUB 0x20 /* No mounts allowed beneath this fs */
#define VFS_REMOUNT 0x40 /* modify mount otions only */
#define VFS_MULTI 0x80 /* Do multi-component lookup on files */
/*
* Operations supported on virtual file system.
*/
struct vfsops {
int (*vfs_mount)(); /* mount file system */
int (*vfs_unmount)(); /* unmount file system */
int (*vfs_root)(); /* get root vnode */
int (*vfs_statfs)(); /* get fs statistics */
int (*vfs_sync)(); /* flush fs buffers */
int (*vfs_vget)(); /* get vnode from fid */
int (*vfs_mountroot)(); /* mount the root filesystem */
#ifndef MACH
int (*vfs_swapvp)(); /* return vnode for swap */
#endif
};
#define VFS_MOUNT(VFSP, PATH, DATA) \
(*(VFSP)->vfs_op->vfs_mount)(VFSP, PATH, DATA)
#define VFS_UNMOUNT(VFSP) (*(VFSP)->vfs_op->vfs_unmount)(VFSP)
#define VFS_ROOT(VFSP, VPP) (*(VFSP)->vfs_op->vfs_root)(VFSP,VPP)
#define VFS_STATFS(VFSP, SBP) (*(VFSP)->vfs_op->vfs_statfs)(VFSP,SBP)
#define VFS_SYNC(VFSP) (*(VFSP)->vfs_op->vfs_sync)(VFSP)
#define VFS_VGET(VFSP, VPP, FIDP) (*(VFSP)->vfs_op->vfs_vget)(VFSP, VPP, FIDP)
#define VFS_MOUNTROOT(VFSP, VPP, NM) \
(*(VFSP)->vfs_op->vfs_mountroot)(VFSP, VPP, NM)
#ifndef MACH
#define VFS_SWAPVP(VFSP, VPP, NM) (*(VFSP)->vfs_op->vfs_swapvp)(VFSP, VPP, NM)
#endif
/*
* file system statistics
*/
struct statfs {
long f_type; /* type of info, zero for now */
long f_bsize; /* fundamental file system block size */
long f_blocks; /* total blocks in file system */
long f_bfree; /* free block in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in file system */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id */
long f_spare[7]; /* spare for later */
};
#ifdef KERNEL
/*
* Filesystem type switch table
*/
struct vfssw {
char *vsw_name; /* type name string */
struct vfsops *vsw_ops; /* filesystem operations vector */
};
/*
* public operations
*/
extern void vfs_mountroot(); /* mount the root */
extern int vfs_add(); /* add a new vfs to mounted vfs list */
extern void vfs_remove(); /* remove a vfs from mounted vfs list */
extern int vfs_lock(); /* lock a vfs */
extern void vfs_unlock(); /* unlock a vfs */
extern struct vfs *getvfs(); /* return vfs given fsid */
extern struct vfssw *getfstype(); /* find default filesystem type */
extern int vfs_getmajor(); /* get major device # for an fs type */
extern void vfs_putmajor(); /* free major device # for an fs type */
extern int vfs_getnum(); /* get device # for an fs type */
extern void vfs_putnum(); /* release device # for an fs type */
#define VFS_INIT(VFSP, OP, DATA) { \
(VFSP)->vfs_next = (struct vfs *)0; \
(VFSP)->vfs_op = (OP); \
(VFSP)->vfs_flag = 0; \
(VFSP)->vfs_stats = NULL; \
(VFSP)->vfs_data = (DATA); \
(VFSP)->vfs_nextentry = (struct vfs *)0; \
(VFSP)->vfs_uid = u.u_uid; \
}
/*
* globals
*/
extern struct vfs *rootvfs; /* ptr to root vfs structure */
extern struct vfssw vfssw[]; /* table of filesystem types */
extern struct vfssw *vfsNVFS; /* vfs switch table end marker */
#endif
#endif /* def VFS_H */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.