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9733a80839
It's not finished yet (I still have to find a way to implement process- dependent nodes without consuming too much memory, and the permission system needs tightening up), but it's becoming hard to work on without a repo (I've accidentally almost nuked it once already), and it works (except for the lack of process-dependent nodes, that is). I was supposed to commit this a week ago, but timed out waiting for jkh to reply to some questions I had. Pass him a spoonful of bad karma :)
182 lines
5.3 KiB
C
182 lines
5.3 KiB
C
/*-
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* Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _PSEUDOFS_H_INCLUDED
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#define _PSEUDOFS_H_INCLUDED
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/*
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* Limits and constants
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*/
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#define PFS_NAMELEN 24
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#define PFS_DELEN (8 + PFS_NAMELEN)
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typedef enum {
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pfstype_none = 0,
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pfstype_root,
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pfstype_dir,
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pfstype_this,
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pfstype_parent,
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pfstype_file,
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pfstype_symlink,
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pfstype_procdep
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} pfs_type_t;
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/* Flags */
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#define PFS_DYNAMIC 1
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/*
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* Data structures
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*/
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struct pfs_info;
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struct pfs_node;
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struct pfs_bitmap;
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typedef int (*pfs_fill_t)(struct pfs_node *, struct proc *, struct sbuf *);
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struct pfs_bitmap; /* opaque */
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/*
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* pfs_info: describes a pseudofs instance
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*/
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struct pfs_info {
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char pi_name[MFSNAMELEN];
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struct pfs_node *pi_root;
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/* members below this line aren't initialized */
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/* currently, the mutex is only used to protect the bitmap */
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struct mtx pi_mutex;
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struct pfs_bitmap *pi_bitmap;
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};
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/*
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* pfs_node: describes a node (file or directory) within a pseudofs
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*/
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struct pfs_node {
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char pn_name[PFS_NAMELEN];
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pfs_type_t pn_type;
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int pn_flags;
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uid_t pn_uid;
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gid_t pn_gid;
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mode_t pn_mode;
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union {
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void *_pn_data;
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pfs_fill_t _pn_func;
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struct pfs_node *_pn_nodes;
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} u1;
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#define pn_data u1._pn_data
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#define pn_func u1._pn_func
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#define pn_nodes u1._pn_nodes
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/* members below this line aren't initialized */
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struct pfs_node *pn_parent;
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union {
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u_int32_t _pn_fileno;
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struct pfs_node *_pn_shadow;
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} u2;
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#define pn_fileno u2._pn_fileno
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#define pn_shadow u2._pn_shadow
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};
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#define PFS_NODE(name, type, flags, uid, gid, mode, data) \
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{ (name), (type), (flags), (uid), (gid), (mode), { (data) } }
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#define PFS_DIR(name, flags, uid, gid, mode, nodes) \
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PFS_NODE(name, pfstype_dir, flags, uid, gid, mode, nodes)
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#define PFS_ROOT(nodes) \
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PFS_NODE("/", pfstype_root, 0, 0, 0, 0555, nodes)
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#define PFS_THIS \
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PFS_NODE(".", pfstype_this, 0, 0, 0, 0, NULL)
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#define PFS_PARENT \
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PFS_NODE("..", pfstype_parent, 0, 0, 0, 0, NULL)
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#define PFS_FILE(name, flags, uid, gid, mode, func) \
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PFS_NODE(name, pfstype_file, flags, uid, gid, mode, func)
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#define PFS_SYMLINK(name, flags, uid, gid, mode, func) \
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PFS_NODE(name, pfstype_symlink, flags, uid, gid, mode, func)
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#define PFS_LASTNODE \
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PFS_NODE("", pfstype_none, 0, 0, 0, 0, NULL)
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/*
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* VFS interface
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*/
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int pfs_mount (struct pfs_info *pi,
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struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p);
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int pfs_unmount (struct mount *mp, int mntflags,
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struct proc *p);
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int pfs_root (struct mount *mp, struct vnode **vpp);
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int pfs_statfs (struct mount *mp, struct statfs *sbp,
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struct proc *p);
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int pfs_init (struct pfs_info *pi, struct vfsconf *vfc);
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int pfs_uninit (struct pfs_info *pi, struct vfsconf *vfc);
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/*
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* Now for some initialization magic...
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*/
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#define PSEUDOFS(name, root) \
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\
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static struct pfs_info name##_info = { \
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#name, \
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&(root) \
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}; \
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\
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static int \
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_##name##_mount(struct mount *mp, char *path, caddr_t data, \
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struct nameidata *ndp, struct proc *p) { \
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return pfs_mount(&name##_info, mp, path, data, ndp, p); \
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} \
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\
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static int \
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_##name##_init(struct vfsconf *vfc) { \
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return pfs_init(&name##_info, vfc); \
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} \
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\
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static int \
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_##name##_uninit(struct vfsconf *vfc) { \
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return pfs_uninit(&name##_info, vfc); \
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} \
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\
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static struct vfsops testfs_vfsops = { \
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_##name##_mount, \
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vfs_stdstart, \
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pfs_unmount, \
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pfs_root, \
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vfs_stdquotactl, \
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pfs_statfs, \
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vfs_stdsync, \
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vfs_stdvget, \
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vfs_stdfhtovp, \
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vfs_stdcheckexp, \
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vfs_stdvptofh, \
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_##name##_init, \
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_##name##_uninit, \
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vfs_stdextattrctl, \
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}; \
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VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC); \
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MODULE_DEPEND(name, pseudofs, 1, 1, 1);
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#endif
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