274 lines
7.3 KiB
C
274 lines
7.3 KiB
C
/*-
|
|
* Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
|
|
* 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
|
|
* in this position and unchanged.
|
|
* 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. 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _PSEUDOFS_H_INCLUDED
|
|
#define _PSEUDOFS_H_INCLUDED
|
|
|
|
/*
|
|
* Opaque structures
|
|
*/
|
|
struct mount;
|
|
struct nameidata;
|
|
struct proc;
|
|
struct sbuf;
|
|
struct statfs;
|
|
struct thread;
|
|
struct uio;
|
|
struct vfsconf;
|
|
struct vnode;
|
|
|
|
/*
|
|
* Limits and constants
|
|
*/
|
|
#define PFS_NAMELEN 24
|
|
#define PFS_FSNAMELEN 16 /* equal to MFSNAMELEN */
|
|
#define PFS_DELEN (8 + PFS_NAMELEN)
|
|
|
|
typedef enum {
|
|
pfstype_none = 0,
|
|
pfstype_root,
|
|
pfstype_dir,
|
|
pfstype_this,
|
|
pfstype_parent,
|
|
pfstype_file,
|
|
pfstype_symlink,
|
|
pfstype_procdir
|
|
} pfs_type_t;
|
|
|
|
/*
|
|
* Flags
|
|
*/
|
|
#define PFS_RD 0x0001 /* readable */
|
|
#define PFS_WR 0x0002 /* writeable */
|
|
#define PFS_RDWR (PFS_RD|PFS_WR)
|
|
#define PFS_RAWRD 0x0004 /* raw reader */
|
|
#define PFS_RAWWR 0x0008 /* raw writer */
|
|
#define PFS_RAW (PFS_RAWRD|PFS_RAWWR)
|
|
#define PFS_PROCDEP 0x0010 /* process-dependent */
|
|
#define PFS_DISABLED 0x8000 /* node is disabled */
|
|
|
|
/*
|
|
* Data structures
|
|
*/
|
|
struct pfs_info;
|
|
struct pfs_node;
|
|
struct pfs_bitmap;
|
|
|
|
/*
|
|
* Init / uninit callback
|
|
*/
|
|
#define PFS_INIT_ARGS \
|
|
struct pfs_info *pi, struct vfsconf *vfc
|
|
#define PFS_INIT_PROTO(name) \
|
|
int name(PFS_INIT_ARGS);
|
|
typedef int (*pfs_init_t)(PFS_INIT_ARGS);
|
|
|
|
/*
|
|
* Filler callback
|
|
*/
|
|
#define PFS_FILL_ARGS \
|
|
struct thread *td, struct proc *p, struct pfs_node *pn, \
|
|
struct sbuf *sb, struct uio *uio
|
|
#define PFS_FILL_PROTO(name) \
|
|
int name(PFS_FILL_ARGS);
|
|
typedef int (*pfs_fill_t)(PFS_FILL_ARGS);
|
|
|
|
/*
|
|
* Attribute callback
|
|
*/
|
|
struct vattr;
|
|
#define PFS_ATTR_ARGS \
|
|
struct thread *td, struct proc *p, struct pfs_node *pn, \
|
|
struct vattr *vap
|
|
#define PFS_ATTR_PROTO(name) \
|
|
int name(PFS_ATTR_ARGS);
|
|
typedef int (*pfs_attr_t)(PFS_ATTR_ARGS);
|
|
|
|
struct pfs_bitmap; /* opaque */
|
|
|
|
/*
|
|
* Visibility callback
|
|
*/
|
|
#define PFS_VIS_ARGS \
|
|
struct thread *td, struct proc *p, struct pfs_node *pn
|
|
#define PFS_VIS_PROTO(name) \
|
|
int name(PFS_VIS_ARGS);
|
|
typedef int (*pfs_vis_t)(PFS_VIS_ARGS);
|
|
|
|
/*
|
|
* Ioctl callback
|
|
*/
|
|
#define PFS_IOCTL_ARGS \
|
|
struct thread *td, struct proc *p, struct pfs_node *pn, \
|
|
unsigned long cmd, caddr_t data
|
|
#define PFS_IOCTL_PROTO(name) \
|
|
int name(PFS_IOCTL_ARGS);
|
|
typedef int (*pfs_ioctl_t)(PFS_IOCTL_ARGS);
|
|
|
|
/*
|
|
* Getextattr callback
|
|
*/
|
|
#define PFS_GETEXTATTR_ARGS \
|
|
struct thread *td, struct proc *p, struct pfs_node *pn, \
|
|
int attrnamespace, const char *name, struct uio *uio, \
|
|
struct ucred *cred
|
|
#define PFS_GETEXTATTR_PROTO(name) \
|
|
int name(PFS_GETEXTATTR_ARGS);
|
|
struct ucred;
|
|
typedef int (*pfs_getextattr_t)(PFS_GETEXTATTR_ARGS);
|
|
|
|
/*
|
|
* Last-close callback
|
|
*/
|
|
#define PFS_CLOSE_ARGS \
|
|
struct thread *td, struct proc *p, struct pfs_node *pn
|
|
#define PFS_CLOSE_PROTO(name) \
|
|
int name(PFS_CLOSE_ARGS);
|
|
typedef int (*pfs_close_t)(PFS_CLOSE_ARGS);
|
|
|
|
/*
|
|
* pfs_info: describes a pseudofs instance
|
|
*/
|
|
struct pfs_info {
|
|
char pi_name[PFS_FSNAMELEN];
|
|
pfs_init_t pi_init;
|
|
pfs_init_t pi_uninit;
|
|
/* members below this line aren't initialized */
|
|
struct pfs_node *pi_root;
|
|
/* currently, the mutex is only used to protect the bitmap */
|
|
struct mtx pi_mutex;
|
|
struct pfs_bitmap *pi_bitmap;
|
|
};
|
|
|
|
/*
|
|
* pfs_node: describes a node (file or directory) within a pseudofs
|
|
*/
|
|
struct pfs_node {
|
|
char pn_name[PFS_NAMELEN];
|
|
pfs_type_t pn_type;
|
|
union {
|
|
void *_pn_dummy;
|
|
pfs_fill_t _pn_func;
|
|
struct pfs_node *_pn_nodes;
|
|
} u1;
|
|
#define pn_func u1._pn_func
|
|
#define pn_nodes u1._pn_nodes
|
|
pfs_ioctl_t pn_ioctl;
|
|
pfs_close_t pn_close;
|
|
pfs_attr_t pn_attr;
|
|
pfs_vis_t pn_vis;
|
|
pfs_getextattr_t pn_getextattr;
|
|
void *pn_data;
|
|
int pn_flags;
|
|
|
|
struct pfs_info *pn_info;
|
|
struct pfs_node *pn_parent;
|
|
struct pfs_node *pn_next;
|
|
u_int32_t pn_fileno;
|
|
};
|
|
|
|
/*
|
|
* VFS interface
|
|
*/
|
|
int pfs_mount (struct pfs_info *pi,
|
|
struct mount *mp, char *path, caddr_t data,
|
|
struct nameidata *ndp, struct thread *td);
|
|
int pfs_unmount (struct mount *mp, int mntflags,
|
|
struct thread *td);
|
|
int pfs_root (struct mount *mp, struct vnode **vpp);
|
|
int pfs_statfs (struct mount *mp, struct statfs *sbp,
|
|
struct thread *td);
|
|
int pfs_init (struct pfs_info *pi, struct vfsconf *vfc);
|
|
int pfs_uninit (struct pfs_info *pi, struct vfsconf *vfc);
|
|
|
|
/*
|
|
* Directory structure construction and manipulation
|
|
*/
|
|
struct pfs_node *pfs_create_dir (struct pfs_node *parent, char *name,
|
|
pfs_attr_t attr, pfs_vis_t vis, int flags);
|
|
struct pfs_node *pfs_create_file(struct pfs_node *parent, char *name,
|
|
pfs_fill_t fill, pfs_attr_t attr,
|
|
pfs_vis_t vis, int flags);
|
|
struct pfs_node *pfs_create_link(struct pfs_node *parent, char *name,
|
|
pfs_fill_t fill, pfs_attr_t attr,
|
|
pfs_vis_t vis, int flags);
|
|
int pfs_disable (struct pfs_node *pn);
|
|
int pfs_enable (struct pfs_node *pn);
|
|
int pfs_destroy (struct pfs_node *pn);
|
|
|
|
/*
|
|
* Now for some initialization magic...
|
|
*/
|
|
#define PSEUDOFS(name, version) \
|
|
\
|
|
static struct pfs_info name##_info = { \
|
|
#name, \
|
|
&name##_init, \
|
|
&name##_uninit, \
|
|
}; \
|
|
\
|
|
static int \
|
|
_##name##_mount(struct mount *mp, char *path, caddr_t data, \
|
|
struct nameidata *ndp, struct thread *td) { \
|
|
return pfs_mount(&name##_info, mp, path, data, ndp, td); \
|
|
} \
|
|
\
|
|
static int \
|
|
_##name##_init(struct vfsconf *vfc) { \
|
|
return pfs_init(&name##_info, vfc); \
|
|
} \
|
|
\
|
|
static int \
|
|
_##name##_uninit(struct vfsconf *vfc) { \
|
|
return pfs_uninit(&name##_info, vfc); \
|
|
} \
|
|
\
|
|
static struct vfsops name##_vfsops = { \
|
|
_##name##_mount, \
|
|
vfs_stdstart, \
|
|
pfs_unmount, \
|
|
pfs_root, \
|
|
vfs_stdquotactl, \
|
|
pfs_statfs, \
|
|
vfs_stdsync, \
|
|
vfs_stdvget, \
|
|
vfs_stdfhtovp, \
|
|
vfs_stdcheckexp, \
|
|
vfs_stdvptofh, \
|
|
_##name##_init, \
|
|
_##name##_uninit, \
|
|
vfs_stdextattrctl, \
|
|
}; \
|
|
VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC); \
|
|
MODULE_VERSION(name, version); \
|
|
MODULE_DEPEND(name, pseudofs, 1, 1, 1);
|
|
|
|
#endif
|