305 lines
6.9 KiB
C
305 lines
6.9 KiB
C
/*
|
|
* Copyright (c) 1990, 1992 Jan-Simon Pendry
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed 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.
|
|
*
|
|
* $Id: fdesc_vfsops.c,v 1.4 1993/06/07 05:25:20 cgd Exp $
|
|
*/
|
|
|
|
/*
|
|
* /dev/fd Filesystem
|
|
*/
|
|
|
|
#include "param.h"
|
|
#include "systm.h"
|
|
#include "time.h"
|
|
#include "types.h"
|
|
#include "proc.h"
|
|
#include "resourcevar.h"
|
|
#include "filedesc.h"
|
|
#include "vnode.h"
|
|
#include "mount.h"
|
|
#include "namei.h"
|
|
#include "malloc.h"
|
|
#include "miscfs/fdesc/fdesc.h"
|
|
|
|
static u_short fdesc_mntid;
|
|
|
|
fdesc_init()
|
|
{
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_init\n"); /* printed during system boot */
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Mount the per-process file descriptors (/dev/fd)
|
|
*/
|
|
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;
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_mount(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
/*
|
|
* Update is a no-op
|
|
*/
|
|
if (mp->mnt_flag & MNT_UPDATE)
|
|
return (EOPNOTSUPP);
|
|
|
|
error = getnewvnode(VT_FDESC, mp, &fdesc_vnodeops, &rvp);
|
|
if (error)
|
|
return (error);
|
|
|
|
fmp = (struct fdescmount *) malloc(sizeof(struct fdescmount),
|
|
M_MISCFSMNT, M_WAITOK);
|
|
rvp->v_type = VDIR;
|
|
rvp->v_flag |= VROOT;
|
|
/*VTOFDESC(rvp)->f_isroot = 1;*/
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_mount: root vp = %x\n", rvp);
|
|
#endif
|
|
fmp->f_root = rvp;
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
mp->mnt_data = (qaddr_t) fmp;
|
|
getnewfsid(mp, MOUNT_FDESC);
|
|
|
|
(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"));
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_mount: at %s\n", mp->mnt_stat.f_mntonname);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
fdesc_start(mp, flags, p)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
fdesc_unmount(mp, mntflags, p)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
int flags = 0;
|
|
extern int doforce;
|
|
struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_unmount(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
if (mntflags & MNT_FORCE) {
|
|
/* fdesc can never be rootfs so don't check for it */
|
|
if (!doforce)
|
|
return (EINVAL);
|
|
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 FDESC_DIAGNOSTIC
|
|
printf("fdesc_unmount: calling mntflushbuf\n");
|
|
#endif
|
|
mntflushbuf(mp, 0);
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_unmount: calling mntinvalbuf\n");
|
|
#endif
|
|
if (mntinvalbuf(mp, 1))
|
|
return (EBUSY);
|
|
if (rootvp->v_usecount > 1)
|
|
return (EBUSY);
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_unmount: calling vflush\n");
|
|
#endif
|
|
if (error = vflush(mp, rootvp, flags))
|
|
return (error);
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
vprint("fdesc root", rootvp);
|
|
#endif
|
|
/*
|
|
* 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_MISCFSMNT);
|
|
mp->mnt_data = 0;
|
|
return 0;
|
|
}
|
|
|
|
fdesc_root(mp, vpp)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_root(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
/*
|
|
* Return locked reference to root.
|
|
*/
|
|
vp = VFSTOFDESC(mp)->f_root;
|
|
VREF(vp);
|
|
VOP_LOCK(vp);
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
fdesc_quotactl(mp, cmd, uid, arg, p)
|
|
struct mount *mp;
|
|
int cmd;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct proc *p;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
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;
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_statfs(mp = %x)\n", mp);
|
|
#endif
|
|
|
|
/*
|
|
* 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_OFILE].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)
|
|
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_type = MOUNT_FDESC;
|
|
sbp->f_flags = 0;
|
|
sbp->f_fsize = DEV_BSIZE;
|
|
sbp->f_bsize = 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) {
|
|
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);
|
|
}
|
|
|
|
fdesc_sync(mp, waitfor)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
fdesc_fhtovp(mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
fdesc_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
struct vfsops fdesc_vfsops = {
|
|
fdesc_mount,
|
|
fdesc_start,
|
|
fdesc_unmount,
|
|
fdesc_root,
|
|
fdesc_quotactl,
|
|
fdesc_statfs,
|
|
fdesc_sync,
|
|
fdesc_fhtovp,
|
|
fdesc_vptofh,
|
|
fdesc_init,
|
|
};
|