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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The 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, QUIET ENJOYMENT 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;
	size_t 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;
	int force = 0;
	struct vnode *rootvp = VFSTOFDESC(mp)->f_root;

	if (mntflags & MNT_FORCE) {
		flags |= FORCECLOSE;
		force = 1;
	}

	if ( (rootvp->v_usecount > 1) && !force )
		return (EBUSY);
	if ( (error = vflush(mp, rootvp, flags)) && !force )
		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 *, void *, 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	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	26	/*
	27	* Copyright (c) 1992, 1993, 1995
	28	* The Regents of the University of California. All rights reserved.
	29	*
	30	* This code is derived from software donated to Berkeley by
	31	* Jan-Simon Pendry.
	32	*
	33	* Redistribution and use in source and binary forms, with or without
	34	* modification, are permitted provided that the following conditions
	35	* are met:
	36	* 1. Redistributions of source code must retain the above copyright
	37	* notice, this list of conditions and the following disclaimer.
	38	* 2. Redistributions in binary form must reproduce the above copyright
	39	* notice, this list of conditions and the following disclaimer in the
	40	* documentation and/or other materials provided with the distribution.
	41	* 3. All advertising materials mentioning features or use of this software
	42	* must display the following acknowledgement:
	43	* This product includes software developed by the University of
	44	* California, Berkeley and its contributors.
	45	* 4. Neither the name of the University nor the names of its contributors
	46	* may be used to endorse or promote products derived from this software
	47	* without specific prior written permission.
	48	*
	49	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	50	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	51	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	52	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	53	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	54	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	55	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	56	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	57	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	58	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	59	* SUCH DAMAGE.
	60	*
	61	* @(#)fdesc_vfsops.c 8.10 (Berkeley) 5/14/95
	62	*
	63	*/
	64
	65	/*
	66	* /dev/fd Filesystem
	67	*/
	68
	69	#include <sys/param.h>
	70	#include <sys/systm.h>
	71	#include <sys/time.h>
	72	#include <sys/types.h>
	73	#include <sys/proc.h>
	74	#include <sys/resourcevar.h>
	75	#include <sys/filedesc.h>
	76	#include <sys/vnode.h>
	77	#include <sys/mount.h>
	78	#include <sys/namei.h>
	79	#include <sys/malloc.h>
	80	#include <miscfs/fdesc/fdesc.h>
	81
	82	/*
	83	* Mount the per-process file descriptors (/dev/fd)
	84	*/
	85	int
86	fdesc_mount(mp, path, data, ndp, p)
87	struct mount *mp;
88	char *path;
89	caddr_t data;
90	struct nameidata *ndp;
91	struct proc *p;
92	{
93	int error = 0;
55e303ae	94	size_t size;
1c79356b A	95	struct fdescmount *fmp;
	96	struct vnode *rvp;
	97
	98	/*
	99	* Update is a no-op
	100	*/
	101	if (mp->mnt_flag & MNT_UPDATE)
	102	return (EOPNOTSUPP);
	103
	104	error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
	105	if (error)
	106	return (error);
	107
	108	MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
	109	M_UFSMNT, M_WAITOK); /* XXX */
	110	rvp->v_type = VDIR;
	111	rvp->v_flag \|= VROOT;
	112	fmp->f_root = rvp;
	113	/* XXX -- don't mark as local to work around fts() problems */
	114	/mp->mnt_flag \|= MNT_LOCAL;/
	115	mp->mnt_data = (qaddr_t) fmp;
	116	vfs_getnewfsid(mp);
	117
	118	(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
	119	bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
	120	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
	121	bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
	122	return (0);
	123	}
	124
	125	int
	126	fdesc_start(mp, flags, p)
	127	struct mount *mp;
	128	int flags;
	129	struct proc *p;
	130	{
	131	return (0);
	132	}
	133
	134	int
	135	fdesc_unmount(mp, mntflags, p)
	136	struct mount *mp;
	137	int mntflags;
	138	struct proc *p;
	139	{
	140	int error;
	141	int flags = 0;
9bccf70c	142	int force = 0;
1c79356b A	143	struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
1c79356b A	144
9bccf70c	145	if (mntflags & MNT_FORCE) {
1c79356b	146	flags \|= FORCECLOSE;
9bccf70c A	147	force = 1;
9bccf70c A	148	}
1c79356b	149
9bccf70c	150	if ( (rootvp->v_usecount > 1) && !force )
1c79356b	151	return (EBUSY);
9bccf70c	152	if ( (error = vflush(mp, rootvp, flags)) && !force )
1c79356b A	153	return (error);
	154
	155	/*
	156	* Release reference on underlying root vnode
	157	*/
	158	vrele(rootvp);
	159	/*
	160	* And blow it away for future re-use
	161	*/
	162	vgone(rootvp);
	163	/*
	164	* Finally, throw away the fdescmount structure
	165	*/
	166	_FREE(mp->mnt_data, M_UFSMNT); /* XXX */
	167	mp->mnt_data = 0;
	168
	169	return (0);
	170	}
	171
	172	int
	173	fdesc_root(mp, vpp)
	174	struct mount *mp;
	175	struct vnode **vpp;
	176	{
	177	struct proc p = current_proc(); / XXX */
	178	struct vnode *vp;
	179
	180	/*
	181	* Return locked reference to root.
	182	*/
	183	vp = VFSTOFDESC(mp)->f_root;
	184	VREF(vp);
	185	vn_lock(vp, LK_EXCLUSIVE \| LK_RETRY, p);
	186	*vpp = vp;
	187	return (0);
	188	}
	189
	190	int
	191	fdesc_statfs(mp, sbp, p)
	192	struct mount *mp;
	193	struct statfs *sbp;
	194	struct proc *p;
	195	{
	196	struct filedesc *fdp;
	197	int lim;
	198	int i;
	199	int last;
	200	int freefd;
	201
	202	/*
	203	* Compute number of free file descriptors.
	204	* [ Strange results will ensue if the open file
	205	* limit is ever reduced below the current number
	206	* of open files... ]
	207	*/
	208	lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
	209	fdp = p->p_fd;
	210	last = min(fdp->fd_nfiles, lim);
	211	freefd = 0;
	212	for (i = fdp->fd_freefile; i < last; i++)
	213	if (fdp->fd_ofiles[i] == NULL &&
	214	!(fdp->fd_ofileflags[i] & UF_RESERVED))
	215	freefd++;
	216
217	/*
218	* Adjust for the fact that the fdesc array may not
219	* have been fully allocated yet.
220	*/
221	if (fdp->fd_nfiles < lim)
222	freefd += (lim - fdp->fd_nfiles);
223
224	sbp->f_flags = 0;
225	sbp->f_bsize = DEV_BSIZE;
226	sbp->f_iosize = DEV_BSIZE;
227	sbp->f_blocks = 2; /* 1K to keep df happy */
228	sbp->f_bfree = 0;
229	sbp->f_bavail = 0;
230	sbp->f_files = lim + 1; /* Allow for "." */
231	sbp->f_ffree = freefd; /* See comments above */
232	if (sbp != &mp->mnt_stat) {
233	sbp->f_type = mp->mnt_vfc->vfc_typenum;
234	bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
235	bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
236	bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
237	}
238	return (0);
239	}
240
241	int
242	fdesc_sync(mp, waitfor)
243	struct mount *mp;
244	int waitfor;
245	{
246
247	return (0);
248	}
249
250	#define fdesc_fhtovp ((int () __P((struct mount , struct fid *, \
251	struct mbuf , struct vnode , int , struct ucred **)))eopnotsupp)
252	#define fdesc_quotactl ((int () __P((struct mount , int, uid_t, caddr_t, \
253	struct proc *)))eopnotsupp)
254	#define fdesc_sysctl ((int () __P((int , u_int, void , size_t , void *, \
255	size_t, struct proc *)))eopnotsupp)
55e303ae	256	#define fdesc_vget ((int () __P((struct mount , void , struct vnode *))) \
1c79356b A	257	eopnotsupp)
	258	#define fdesc_vptofh ((int () __P((struct vnode , struct fid *)))eopnotsupp)
	259
	260	struct vfsops fdesc_vfsops = {
	261	fdesc_mount,
	262	fdesc_start,
	263	fdesc_unmount,
	264	fdesc_root,
	265	fdesc_quotactl,
	266	fdesc_statfs,
	267	fdesc_sync,
	268	fdesc_vget,
	269	fdesc_fhtovp,
	270	fdesc_vptofh,
	271	fdesc_init,
	272	fdesc_sysctl,
	273	};