203 lines
6.3 KiB
C
203 lines
6.3 KiB
C
/* $NetBSD: kernfs.h,v 1.31 2006/06/23 20:54:21 christos Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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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* 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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kernfs.h 8.6 (Berkeley) 3/29/95
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*/
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#define _PATH_KERNFS "/kern" /* Default mountpoint */
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#ifdef _KERNEL
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#include <sys/queue.h>
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/*
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* The different types of node in a kernfs filesystem
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*/
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typedef enum {
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KFSkern, /* the filesystem itself (.) */
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KFSroot, /* the filesystem root (..) */
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KFSnull, /* none aplicable */
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KFStime, /* boottime */
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KFSint, /* integer */
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KFSstring, /* string */
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KFShostname, /* hostname */
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KFSavenrun, /* loadavg */
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KFSdevice, /* device file (rootdev/rrootdev) */
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KFSmsgbuf, /* msgbuf */
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KFSipsecsadir, /* ipsec security association (top dir) */
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KFSipsecspdir, /* ipsec security policy (top dir) */
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KFSipsecsa, /* ipsec security association entry */
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KFSipsecsp, /* ipsec security policy entry */
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KFSsubdir, /* directory */
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KFSlasttype, /* last used type */
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KFSmaxtype = (1<<6) - 1 /* last possible type */
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} kfstype;
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/*
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* Control data for the kern file system.
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*/
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struct kern_target {
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u_char kt_type;
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u_char kt_namlen;
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const char *kt_name;
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void *kt_data;
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kfstype kt_tag;
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u_char kt_vtype;
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mode_t kt_mode;
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};
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struct dyn_kern_target {
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struct kern_target dkt_kt;
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SIMPLEQ_ENTRY(dyn_kern_target) dkt_queue;
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};
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struct kernfs_subdir {
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SIMPLEQ_HEAD(,dyn_kern_target) ks_entries;
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unsigned int ks_nentries;
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unsigned int ks_dirs;
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const struct kern_target *ks_parent;
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};
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struct kernfs_node {
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LIST_ENTRY(kernfs_node) kfs_hash; /* hash chain */
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TAILQ_ENTRY(kernfs_node) kfs_list; /* flat list */
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struct vnode *kfs_vnode; /* vnode associated with this pfsnode */
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kfstype kfs_type; /* type of procfs node */
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mode_t kfs_mode; /* mode bits for stat() */
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long kfs_fileno; /* unique file id */
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u_int32_t kfs_value; /* SA id or SP id (KFSint) */
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const struct kern_target *kfs_kt;
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void *kfs_v; /* pointer to secasvar/secpolicy/mbuf */
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long kfs_cookie; /* fileno cookie */
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};
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struct kernfs_mount {
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TAILQ_HEAD(, kernfs_node) nodelist;
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long fileno_cookie;
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};
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#define UIO_MX 32
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#define KERNFS_FILENO(kt, typ, cookie) \
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((kt >= &kern_targets[0] && kt < &kern_targets[static_nkern_targets]) \
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? 2 + ((kt) - &kern_targets[0]) \
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: (((cookie + 1) << 6) | (typ)))
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#define KERNFS_TYPE_FILENO(typ, cookie) \
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(((cookie + 1) << 6) | (typ))
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#define VFSTOKERNFS(mp) ((struct kernfs_mount *)((mp)->mnt_data))
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#define VTOKERN(vp) ((struct kernfs_node *)(vp)->v_data)
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#define KERNFSTOV(kfs) ((kfs)->kfs_vnode)
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extern const struct kern_target kern_targets[];
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extern int nkern_targets;
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extern const int static_nkern_targets;
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extern int (**kernfs_vnodeop_p)(void *);
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extern struct vfsops kernfs_vfsops;
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extern dev_t rrootdev;
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struct secasvar;
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struct secpolicy;
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int kernfs_root(struct mount *, struct vnode **);
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void kernfs_hashinit(void);
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void kernfs_hashreinit(void);
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void kernfs_hashdone(void);
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int kernfs_freevp(struct vnode *);
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int kernfs_allocvp(struct mount *, struct vnode **, kfstype,
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const struct kern_target *, u_int32_t);
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void kernfs_revoke_sa(struct secasvar *);
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void kernfs_revoke_sp(struct secpolicy *);
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/*
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* Data types for the kernfs file operations.
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*/
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typedef enum {
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KERNFS_XREAD,
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KERNFS_XWRITE,
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KERNFS_FILEOP_CLOSE,
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KERNFS_FILEOP_GETATTR,
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KERNFS_FILEOP_IOCTL,
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KERNFS_FILEOP_OPEN,
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KERNFS_FILEOP_READ,
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KERNFS_FILEOP_WRITE,
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} kfsfileop;
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struct kernfs_fileop {
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kfstype kf_type;
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kfsfileop kf_fileop;
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union {
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int (*_kf_vop)(void *);
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int (*_kf_xread)
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(const struct kernfs_node *, char **, size_t);
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int (*_kf_xwrite)
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(const struct kernfs_node *, char *, size_t);
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} _kf_opfn;
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SPLAY_ENTRY(kernfs_fileop) kf_node;
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};
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#define kf_vop _kf_opfn._kf_vop
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#define kf_xread _kf_opfn._kf_xread
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#define kf_xwrite _kf_opfn._kf_xwrite
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typedef struct kern_target kernfs_parentdir_t;
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typedef struct dyn_kern_target kernfs_entry_t;
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/*
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* Functions for adding kernfs datatypes and nodes.
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*/
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kfstype kernfs_alloctype(int, const struct kernfs_fileop *);
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#define KERNFS_ALLOCTYPE(kf) kernfs_alloctype(sizeof((kf)) / \
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sizeof((kf)[0]), (kf))
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#define KERNFS_ALLOCENTRY(dkt, m_type, m_flags) \
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dkt = (struct dyn_kern_target *)malloc( \
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sizeof(struct dyn_kern_target), (m_type), (m_flags))
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#define KERNFS_INITENTRY(dkt, type, name, data, tag, vtype, mode) do { \
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(dkt)->dkt_kt.kt_type = (type); \
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(dkt)->dkt_kt.kt_namlen = strlen((name)); \
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(dkt)->dkt_kt.kt_name = (name); \
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(dkt)->dkt_kt.kt_data = (data); \
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(dkt)->dkt_kt.kt_tag = (tag); \
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(dkt)->dkt_kt.kt_vtype = (vtype); \
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(dkt)->dkt_kt.kt_mode = (mode); \
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} while (/*CONSTCOND*/0)
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#define KERNFS_ENTOPARENTDIR(dkt) &(dkt)->dkt_kt
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int kernfs_addentry(kernfs_parentdir_t *, kernfs_entry_t *);
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#ifdef SYSCTL_SETUP_PROTO
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SYSCTL_SETUP_PROTO(sysctl_vfs_kernfs_setup);
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#endif /* SYSCTL_SETUP_PROTO */
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#endif /* _KERNEL */
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