[dragonfly.git] / sys / vfs / portal / portal_vfsops.c

/*
 * 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.
 *
 *	@(#)portal_vfsops.c	8.11 (Berkeley) 5/14/95
 *
 * $FreeBSD: src/sys/miscfs/portal/portal_vfsops.c,v 1.26.2.2 2001/07/26 20:37:16 iedowse Exp $
 * $DragonFly: src/sys/vfs/portal/portal_vfsops.c,v 1.24 2007/05/18 17:05:13 dillon Exp $
 */

/*
 * Portal Filesystem
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include "portal.h"

extern struct vop_ops portal_vnode_vops;

static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");

static int	portal_mount (struct mount *mp, char *path, caddr_t data,
				  struct ucred *cred);
static int	portal_unmount (struct mount *mp, int mntflags);
static int	portal_root (struct mount *mp, struct vnode **vpp);
static int	portal_statfs (struct mount *mp, struct statfs *sbp,
				struct ucred *);

/*
 * Mount the per-process file descriptors (/dev/fd)
 */
static int
portal_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
{
	struct file *fp;
	struct portal_args args;
	struct portalmount *fmp;
	struct socket *so;
	struct vnode *rvp;
	struct portalnode *pn;
	size_t size;
	int error;

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

	error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
	if (error)
		return (error);

	KKASSERT(curproc != NULL);
	error = holdsock(curproc->p_fd, args.pa_socket, &fp);
	if (error)
		return (error);
	so = (struct socket *) fp->f_data;
	if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
		fdrop(fp);
		return (ESOCKTNOSUPPORT);
	}

	MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
		M_TEMP, M_WAITOK);

	MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
		M_PORTALFSMNT, M_WAITOK);	/* XXX */

	 
	vfs_add_vnodeops(mp, &portal_vnode_vops, &mp->mnt_vn_norm_ops);

	error = getnewvnode(VT_PORTAL, mp, &rvp, 0, 0);
	if (error) {
		FREE(fmp, M_PORTALFSMNT);
		FREE(pn, M_TEMP);
		fdrop(fp);
		return (error);
	}

	rvp->v_data = pn;
	rvp->v_type = VDIR;
	rvp->v_flag |= VROOT;
	VTOPORTAL(rvp)->pt_arg = 0;
	VTOPORTAL(rvp)->pt_size = 0;
	VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
	fmp->pm_root = rvp;
	fmp->pm_server = fp; fp->f_count++;

	mp->mnt_flag |= MNT_LOCAL;
	mp->mnt_data = (qaddr_t) fmp;
	vfs_getnewfsid(mp);

	(void)copyinstr(args.pa_config,
	    mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);

#ifdef notdef
	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
	bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
#endif
	vx_unlock(rvp);

	(void)portal_statfs(mp, &mp->mnt_stat, cred);
	fdrop(fp);
	return (0);
}

static int
portal_unmount(struct mount *mp, int mntflags)
{
	int error, flags = 0;


	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...
	 */
#ifdef notyet
	mntflushbuf(mp, 0);
	if (mntinvalbuf(mp, 1))
		return (EBUSY);
#endif
	/* There is 1 extra root vnode reference (pm_root). */
	error = vflush(mp, 1, flags);
	if (error)
		return (error);

	/*
	 * Shutdown the socket.  This will cause the select in the
	 * daemon to wake up, and then the accept will get ECONNABORTED
	 * which it interprets as a request to go and bury itself.
	 */
	soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data,
		SHUT_RDWR);
	/*
	 * Discard reference to underlying file.  Must call closef because
	 * this may be the last reference.
	 */
	closef(VFSTOPORTAL(mp)->pm_server, NULL);
	/*
	 * Finally, throw away the portalmount structure
	 */
	kfree(mp->mnt_data, M_PORTALFSMNT);	/* XXX */
	mp->mnt_data = 0;
	return (0);
}

static int
portal_root(struct mount *mp, struct vnode **vpp)
{
	struct vnode *vp;
	int error;

	/*
	 * Return locked reference to root.
	 */
	vp = VFSTOPORTAL(mp)->pm_root;
	error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
	if (error == 0)
		*vpp = vp;
	return (error);
}

static int
portal_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
{
	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 = 1;		/* Allow for "." */
	sbp->f_ffree = 0;		/* 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_mntfromname, sbp->f_mntfromname, MNAMELEN);
	}
	return (0);
}

static struct vfsops portal_vfsops = {
	.vfs_mount =    	portal_mount,
	.vfs_unmount =  	portal_unmount,
	.vfs_root =     	portal_root,
	.vfs_statfs =   	portal_statfs,
	.vfs_sync =     	vfs_stdsync
};

VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC);
Commit	Line	Data
984263bc MD	1	/*
	2	* Copyright (c) 1992, 1993, 1995
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software donated to Berkeley by
	6	* Jan-Simon Pendry.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*
	36	* @(#)portal_vfsops.c 8.11 (Berkeley) 5/14/95
	37	*
	38	* $FreeBSD: src/sys/miscfs/portal/portal_vfsops.c,v 1.26.2.2 2001/07/26 20:37:16 iedowse Exp $
e5d03018	39	* $DragonFly: src/sys/vfs/portal/portal_vfsops.c,v 1.24 2007/05/18 17:05:13 dillon Exp $
984263bc MD	40	*/
	41
	42	/*
	43	* Portal Filesystem
	44	*/
	45
	46	#include <sys/param.h>
	47	#include <sys/systm.h>
	48	#include <sys/kernel.h>
	49	#include <sys/proc.h>
	50	#include <sys/filedesc.h>
	51	#include <sys/file.h>
	52	#include <sys/vnode.h>
	53	#include <sys/mount.h>
	54	#include <sys/malloc.h>
	55	#include <sys/socket.h>
	56	#include <sys/socketvar.h>
	57	#include <sys/protosw.h>
	58	#include <sys/domain.h>
1f2de5d4	59	#include "portal.h"
984263bc	60
66a1ddf5	61	extern struct vop_ops portal_vnode_vops;
0961aa92	62
984263bc MD	63	static MALLOC_DEFINE(M_PORTALFSMNT, "PORTAL mount", "PORTAL mount structure");
984263bc MD	64
a6ee311a	65	static int portal_mount (struct mount mp, char path, caddr_t data,
acde96db MD	66	struct ucred *cred);
acde96db MD	67	static int portal_unmount (struct mount *mp, int mntflags);
a6ee311a RG	68	static int portal_root (struct mount mp, struct vnode *vpp);
a6ee311a RG	69	static int portal_statfs (struct mount mp, struct statfs sbp,
acde96db	70	struct ucred *);
984263bc MD	71
	72	/*
	73	* Mount the per-process file descriptors (/dev/fd)
	74	*/
	75	static int
acde96db	76	portal_mount(struct mount mp, char path, caddr_t data, struct ucred *cred)
984263bc MD	77	{
	78	struct file *fp;
	79	struct portal_args args;
	80	struct portalmount *fmp;
	81	struct socket *so;
	82	struct vnode *rvp;
	83	struct portalnode *pn;
973c11b9	84	size_t size;
984263bc MD	85	int error;
	86
	87	/*
	88	* Update is a no-op
	89	*/
	90	if (mp->mnt_flag & MNT_UPDATE)
	91	return (EOPNOTSUPP);
	92
	93	error = copyin(data, (caddr_t) &args, sizeof(struct portal_args));
	94	if (error)
	95	return (error);
	96
acde96db MD	97	KKASSERT(curproc != NULL);
acde96db MD	98	error = holdsock(curproc->p_fd, args.pa_socket, &fp);
984263bc MD	99	if (error)
	100	return (error);
	101	so = (struct socket *) fp->f_data;
	102	if (so->so_proto->pr_domain->dom_family != AF_UNIX) {
9f87144f	103	fdrop(fp);
984263bc MD	104	return (ESOCKTNOSUPPORT);
	105	}
	106
	107	MALLOC(pn, struct portalnode *, sizeof(struct portalnode),
	108	M_TEMP, M_WAITOK);
	109
	110	MALLOC(fmp, struct portalmount *, sizeof(struct portalmount),
	111	M_PORTALFSMNT, M_WAITOK); /* XXX */
	112
0961aa92	113
66a1ddf5	114	vfs_add_vnodeops(mp, &portal_vnode_vops, &mp->mnt_vn_norm_ops);
0961aa92	115
6ddb7618	116	error = getnewvnode(VT_PORTAL, mp, &rvp, 0, 0);
984263bc MD	117	if (error) {
	118	FREE(fmp, M_PORTALFSMNT);
	119	FREE(pn, M_TEMP);
9f87144f	120	fdrop(fp);
984263bc MD	121	return (error);
	122	}
	123
	124	rvp->v_data = pn;
	125	rvp->v_type = VDIR;
	126	rvp->v_flag \|= VROOT;
	127	VTOPORTAL(rvp)->pt_arg = 0;
	128	VTOPORTAL(rvp)->pt_size = 0;
	129	VTOPORTAL(rvp)->pt_fileid = PORTAL_ROOTFILEID;
	130	fmp->pm_root = rvp;
	131	fmp->pm_server = fp; fp->f_count++;
	132
	133	mp->mnt_flag \|= MNT_LOCAL;
	134	mp->mnt_data = (qaddr_t) fmp;
	135	vfs_getnewfsid(mp);
	136
984263bc MD	137	(void)copyinstr(args.pa_config,
	138	mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
	139	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
	140
	141	#ifdef notdef
	142	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
	143	bcopy("portal", mp->mnt_stat.f_mntfromname, sizeof("portal"));
	144	#endif
5fd012e0	145	vx_unlock(rvp);
984263bc	146
acde96db	147	(void)portal_statfs(mp, &mp->mnt_stat, cred);
9f87144f	148	fdrop(fp);
984263bc MD	149	return (0);
	150	}
	151
	152	static int
acde96db	153	portal_unmount(struct mount *mp, int mntflags)
984263bc MD	154	{
	155	int error, flags = 0;
	156
	157
	158	if (mntflags & MNT_FORCE)
	159	flags \|= FORCECLOSE;
	160
	161	/*
	162	* Clear out buffer cache. I don't think we
	163	* ever get anything cached at this level at the
	164	* moment, but who knows...
	165	*/
	166	#ifdef notyet
	167	mntflushbuf(mp, 0);
	168	if (mntinvalbuf(mp, 1))
	169	return (EBUSY);
	170	#endif
	171	/* There is 1 extra root vnode reference (pm_root). */
	172	error = vflush(mp, 1, flags);
	173	if (error)
	174	return (error);
	175
	176	/*
	177	* Shutdown the socket. This will cause the select in the
	178	* daemon to wake up, and then the accept will get ECONNABORTED
	179	* which it interprets as a request to go and bury itself.
	180	*/
e5d03018 MD	181	soshutdown((struct socket *) VFSTOPORTAL(mp)->pm_server->f_data,
e5d03018 MD	182	SHUT_RDWR);
984263bc MD	183	/*
	184	* Discard reference to underlying file. Must call closef because
	185	* this may be the last reference.
	186	*/
902ec341	187	closef(VFSTOPORTAL(mp)->pm_server, NULL);
984263bc MD	188	/*
	189	* Finally, throw away the portalmount structure
	190	*/
efda3bd0	191	kfree(mp->mnt_data, M_PORTALFSMNT); /* XXX */
984263bc MD	192	mp->mnt_data = 0;
	193	return (0);
	194	}
	195
	196	static int
1f03da75	197	portal_root(struct mount mp, struct vnode *vpp)
984263bc	198	{
984263bc	199	struct vnode *vp;
44b1cf3d	200	int error;
984263bc MD	201
	202	/*
	203	* Return locked reference to root.
	204	*/
	205	vp = VFSTOPORTAL(mp)->pm_root;
44b1cf3d MD	206	error = vget(vp, LK_EXCLUSIVE \| LK_RETRY);
	207	if (error == 0)
	208	*vpp = vp;
	209	return (error);
984263bc MD	210	}
	211
	212	static int
acde96db	213	portal_statfs(struct mount mp, struct statfs sbp, struct ucred *cred)
984263bc	214	{
984263bc MD	215	sbp->f_flags = 0;
	216	sbp->f_bsize = DEV_BSIZE;
	217	sbp->f_iosize = DEV_BSIZE;
	218	sbp->f_blocks = 2; /* 1K to keep df happy */
	219	sbp->f_bfree = 0;
	220	sbp->f_bavail = 0;
	221	sbp->f_files = 1; /* Allow for "." */
	222	sbp->f_ffree = 0; /* See comments above */
	223	if (sbp != &mp->mnt_stat) {
	224	sbp->f_type = mp->mnt_vfc->vfc_typenum;
	225	bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
984263bc MD	226	bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
	227	}
	228	return (0);
	229	}
	230
	231	static struct vfsops portal_vfsops = {
43c45e8f HP	232	.vfs_mount = portal_mount,
	233	.vfs_unmount = portal_unmount,
	234	.vfs_root = portal_root,
	235	.vfs_statfs = portal_statfs,
	236	.vfs_sync = vfs_stdsync
984263bc MD	237	};
	238
	239	VFS_SET(portal_vfsops, portal, VFCF_SYNTHETIC);