[apple/xnu.git] / bsd / miscfs / fdesc / fdesc_vfsops.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1992, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)fdesc_vfsops.c	8.10 (Berkeley) 5/14/95
 *
 */

/*
 * /dev/fd Filesystem
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/filedesc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <miscfs/fdesc/fdesc.h>

/*
 * Mount the per-process file descriptors (/dev/fd)
 */
int
fdesc_mount(mp, path, data, ndp, p)
	struct mount *mp;
	char *path;
	caddr_t data;
	struct nameidata *ndp;
	struct proc *p;
{
	int error = 0;
	u_int size;
	struct fdescmount *fmp;
	struct vnode *rvp;

	/*
	 * Update is a no-op
	 */
	if (mp->mnt_flag & MNT_UPDATE)
		return (EOPNOTSUPP);

	error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
	if (error)
		return (error);

	MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
				M_UFSMNT, M_WAITOK);	/* XXX */
	rvp->v_type = VDIR;
	rvp->v_flag |= VROOT;
	fmp->f_root = rvp;
	/* XXX -- don't mark as local to work around fts() problems */
	/*mp->mnt_flag |= MNT_LOCAL;*/
	mp->mnt_data = (qaddr_t) fmp;
	vfs_getnewfsid(mp);

	(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
	bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
	bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
	return (0);
}

int
fdesc_start(mp, flags, p)
	struct mount *mp;
	int flags;
	struct proc *p;
{
	return (0);
}

int
fdesc_unmount(mp, mntflags, p)
	struct mount *mp;
	int mntflags;
	struct proc *p;
{
	int error;
	int flags = 0;
	struct vnode *rootvp = VFSTOFDESC(mp)->f_root;

	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;

	/*
	 * Clear out buffer cache.  I don't think we
	 * ever get anything cached at this level at the
	 * moment, but who knows...
	 */
	if (rootvp->v_usecount > 1)
		return (EBUSY);
	if (error = vflush(mp, rootvp, flags))
		return (error);

	/*
	 * Release reference on underlying root vnode
	 */
	vrele(rootvp);
	/*
	 * And blow it away for future re-use
	 */
	vgone(rootvp);
	/*
	 * Finally, throw away the fdescmount structure
	 */
	_FREE(mp->mnt_data, M_UFSMNT);	/* XXX */
	mp->mnt_data = 0;

	return (0);
}

int
fdesc_root(mp, vpp)
	struct mount *mp;
	struct vnode **vpp;
{
	struct proc *p = current_proc();	/* XXX */
	struct vnode *vp;

	/*
	 * Return locked reference to root.
	 */
	vp = VFSTOFDESC(mp)->f_root;
	VREF(vp);
	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
	*vpp = vp;
	return (0);
}

int
fdesc_statfs(mp, sbp, p)
	struct mount *mp;
	struct statfs *sbp;
	struct proc *p;
{
	struct filedesc *fdp;
	int lim;
	int i;
	int last;
	int freefd;

	/*
	 * Compute number of free file descriptors.
	 * [ Strange results will ensue if the open file
	 * limit is ever reduced below the current number
	 * of open files... ]
	 */
	lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
	fdp = p->p_fd;
	last = min(fdp->fd_nfiles, lim);
	freefd = 0;
	for (i = fdp->fd_freefile; i < last; i++)
		if (fdp->fd_ofiles[i] == NULL &&
				!(fdp->fd_ofileflags[i] & UF_RESERVED))
			freefd++;

	/*
	 * Adjust for the fact that the fdesc array may not
	 * have been fully allocated yet.
	 */
	if (fdp->fd_nfiles < lim)
		freefd += (lim - fdp->fd_nfiles);

	sbp->f_flags = 0;
	sbp->f_bsize = DEV_BSIZE;
	sbp->f_iosize = DEV_BSIZE;
	sbp->f_blocks = 2;		/* 1K to keep df happy */
	sbp->f_bfree = 0;
	sbp->f_bavail = 0;
	sbp->f_files = lim + 1;		/* Allow for "." */
	sbp->f_ffree = freefd;		/* See comments above */
	if (sbp != &mp->mnt_stat) {
		sbp->f_type = mp->mnt_vfc->vfc_typenum;
		bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
		bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
		bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
	}
	return (0);
}

int
fdesc_sync(mp, waitfor)
	struct mount *mp;
	int waitfor;
{

	return (0);
}

#define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
	    struct mbuf *, struct vnode **, int *, struct ucred **)))eopnotsupp)
#define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
	    struct proc *)))eopnotsupp)
#define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
	    size_t, struct proc *)))eopnotsupp)
#define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
	    eopnotsupp)
#define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)

struct vfsops fdesc_vfsops = {
	fdesc_mount,
	fdesc_start,
	fdesc_unmount,
	fdesc_root,
	fdesc_quotactl,
	fdesc_statfs,
	fdesc_sync,
	fdesc_vget,
	fdesc_fhtovp,
	fdesc_vptofh,
	fdesc_init,
	fdesc_sysctl,
};
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	23	/*
	24	* Copyright (c) 1992, 1993, 1995
	25	* The Regents of the University of California. All rights reserved.
	26	*
	27	* This code is derived from software donated to Berkeley by
	28	* Jan-Simon Pendry.
	29	*
	30	* Redistribution and use in source and binary forms, with or without
	31	* modification, are permitted provided that the following conditions
	32	* are met:
	33	* 1. Redistributions of source code must retain the above copyright
	34	* notice, this list of conditions and the following disclaimer.
	35	* 2. Redistributions in binary form must reproduce the above copyright
	36	* notice, this list of conditions and the following disclaimer in the
	37	* documentation and/or other materials provided with the distribution.
	38	* 3. All advertising materials mentioning features or use of this software
	39	* must display the following acknowledgement:
	40	* This product includes software developed by the University of
	41	* California, Berkeley and its contributors.
	42	* 4. Neither the name of the University nor the names of its contributors
	43	* may be used to endorse or promote products derived from this software
	44	* without specific prior written permission.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*
	58	* @(#)fdesc_vfsops.c 8.10 (Berkeley) 5/14/95
	59	*
	60	*/
	61
	62	/*
	63	* /dev/fd Filesystem
	64	*/
65
66	#include <sys/param.h>
67	#include <sys/systm.h>
68	#include <sys/time.h>
69	#include <sys/types.h>
70	#include <sys/proc.h>
71	#include <sys/resourcevar.h>
72	#include <sys/filedesc.h>
73	#include <sys/vnode.h>
74	#include <sys/mount.h>
75	#include <sys/namei.h>
76	#include <sys/malloc.h>
77	#include <miscfs/fdesc/fdesc.h>
78
79	/*
80	* Mount the per-process file descriptors (/dev/fd)
81	*/
82	int
83	fdesc_mount(mp, path, data, ndp, p)
84	struct mount *mp;
85	char *path;
86	caddr_t data;
87	struct nameidata *ndp;
88	struct proc *p;
89	{
90	int error = 0;
91	u_int size;
92	struct fdescmount *fmp;
93	struct vnode *rvp;
94
95	/*
96	* Update is a no-op
97	*/
98	if (mp->mnt_flag & MNT_UPDATE)
99	return (EOPNOTSUPP);
100
101	error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
102	if (error)
103	return (error);
104
105	MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
106	M_UFSMNT, M_WAITOK); /* XXX */
107	rvp->v_type = VDIR;
108	rvp->v_flag \|= VROOT;
109	fmp->f_root = rvp;
110	/* XXX -- don't mark as local to work around fts() problems */
111	/mp->mnt_flag \|= MNT_LOCAL;/
112	mp->mnt_data = (qaddr_t) fmp;
113	vfs_getnewfsid(mp);
114
115	(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
116	bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
117	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
118	bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
119	return (0);
120	}
121
122	int
123	fdesc_start(mp, flags, p)
124	struct mount *mp;
125	int flags;
126	struct proc *p;
127	{
128	return (0);
129	}
130
131	int
132	fdesc_unmount(mp, mntflags, p)
133	struct mount *mp;
134	int mntflags;
135	struct proc *p;
136	{
137	int error;
138	int flags = 0;
139	struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
140
141	if (mntflags & MNT_FORCE)
142	flags \|= FORCECLOSE;
143
144	/*
145	* Clear out buffer cache. I don't think we
146	* ever get anything cached at this level at the
147	* moment, but who knows...
148	*/
149	if (rootvp->v_usecount > 1)
150	return (EBUSY);
151	if (error = vflush(mp, rootvp, flags))
152	return (error);
153
154	/*
155	* Release reference on underlying root vnode
156	*/
157	vrele(rootvp);
158	/*
159	* And blow it away for future re-use
160	*/
161	vgone(rootvp);
162	/*
163	* Finally, throw away the fdescmount structure
164	*/
165	_FREE(mp->mnt_data, M_UFSMNT); /* XXX */
166	mp->mnt_data = 0;
167
168	return (0);
169	}
170
171	int
172	fdesc_root(mp, vpp)
173	struct mount *mp;
174	struct vnode **vpp;
175	{
176	struct proc p = current_proc(); / XXX */
177	struct vnode *vp;
178
179	/*
180	* Return locked reference to root.
181	*/
182	vp = VFSTOFDESC(mp)->f_root;
183	VREF(vp);
184	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY, p);
185	*vpp = vp;
186	return (0);
187	}
188
189	int
190	fdesc_statfs(mp, sbp, p)
191	struct mount *mp;
192	struct statfs *sbp;
193	struct proc *p;
194	{
195	struct filedesc *fdp;
196	int lim;
197	int i;
198	int last;
199	int freefd;
200
201	/*
202	* Compute number of free file descriptors.
203	* [ Strange results will ensue if the open file
204	* limit is ever reduced below the current number
205	* of open files... ]
206	*/
207	lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
208	fdp = p->p_fd;
209	last = min(fdp->fd_nfiles, lim);
210	freefd = 0;
211	for (i = fdp->fd_freefile; i < last; i++)
212	if (fdp->fd_ofiles[i] == NULL &&
213	!(fdp->fd_ofileflags[i] & UF_RESERVED))
214	freefd++;
215
216	/*
217	* Adjust for the fact that the fdesc array may not
218	* have been fully allocated yet.
219	*/
220	if (fdp->fd_nfiles < lim)
221	freefd += (lim - fdp->fd_nfiles);
222
223	sbp->f_flags = 0;
224	sbp->f_bsize = DEV_BSIZE;
225	sbp->f_iosize = DEV_BSIZE;
226	sbp->f_blocks = 2; /* 1K to keep df happy */
227	sbp->f_bfree = 0;
228	sbp->f_bavail = 0;
229	sbp->f_files = lim + 1; /* Allow for "." */
230	sbp->f_ffree = freefd; /* See comments above */
231	if (sbp != &mp->mnt_stat) {
232	sbp->f_type = mp->mnt_vfc->vfc_typenum;
233	bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
234	bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
235	bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
236	}
237	return (0);
238	}
239
240	int
241	fdesc_sync(mp, waitfor)
242	struct mount *mp;
243	int waitfor;
244	{
245
246	return (0);
247	}
248
249	#define fdesc_fhtovp ((int () __P((struct mount , struct fid *, \
250	struct mbuf , struct vnode , int , struct ucred **)))eopnotsupp)
251	#define fdesc_quotactl ((int () __P((struct mount , int, uid_t, caddr_t, \
252	struct proc *)))eopnotsupp)
253	#define fdesc_sysctl ((int () __P((int , u_int, void , size_t , void *, \
254	size_t, struct proc *)))eopnotsupp)
255	#define fdesc_vget ((int () __P((struct mount , ino_t, struct vnode **))) \
256	eopnotsupp)
257	#define fdesc_vptofh ((int () __P((struct vnode , struct fid *)))eopnotsupp)
258
259	struct vfsops fdesc_vfsops = {
260	fdesc_mount,
261	fdesc_start,
262	fdesc_unmount,
263	fdesc_root,
264	fdesc_quotactl,
265	fdesc_statfs,
266	fdesc_sync,
267	fdesc_vget,
268	fdesc_fhtovp,
269	fdesc_vptofh,
270	fdesc_init,
271	fdesc_sysctl,
272	};