312 lines
7.2 KiB
C
312 lines
7.2 KiB
C
/*
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* Copyright (c) 1992 The Regents of the University of California
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* Copyright (c) 1990, 1992 Jan-Simon Pendry
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* From:
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* Id: fdesc_vfsops.c,v 4.1 1993/12/17 10:47:45 jsp Rel
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*
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* $Id: fdesc_vfsops.c,v 1.8 1994/01/09 17:33:06 ws Exp $
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*/
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/*
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* /dev/fd Filesystem
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/filedesc.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <miscfs/fdesc/fdesc.h>
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dev_t devctty;
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fdesc_init()
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{
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_init\n"); /* printed during system boot */
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#endif
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devctty = makedev(nchrdev, 0);
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}
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/*
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* Mount the per-process file descriptors (/dev/fd)
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*/
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fdesc_mount(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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int error = 0;
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u_int size;
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struct fdescmount *fmp;
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struct vnode *rvp;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_mount(mp = %x)\n", mp);
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#endif
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/*
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* Update is a no-op
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*/
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
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if (error)
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return (error);
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MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
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M_MISCFSMNT, M_WAITOK);
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rvp->v_type = VDIR;
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rvp->v_flag |= VROOT;
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VTOFDESC(rvp)->fd_type = Froot;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_mount: root vp = %x\n", rvp);
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#endif
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fmp->f_root = rvp;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = (qaddr_t) fmp;
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getnewfsid(mp, MOUNT_FDESC);
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(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
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bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
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bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_mount: at %s\n", mp->mnt_stat.f_mntonname);
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#endif
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return (0);
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}
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fdesc_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return (0);
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}
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fdesc_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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int error;
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int flags = 0;
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extern int doforce;
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struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_unmount(mp = %x)\n", mp);
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#endif
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if (mntflags & MNT_FORCE) {
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/* fdesc can never be rootfs so don't check for it */
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if (!doforce)
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return (EINVAL);
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flags |= FORCECLOSE;
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}
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/*
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* Clear out buffer cache. I don't think we
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* ever get anything cached at this level at the
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* moment, but who knows...
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*/
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_unmount: calling mntflushbuf\n");
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#endif
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mntflushbuf(mp, 0);
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_unmount: calling mntinvalbuf\n");
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#endif
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if (mntinvalbuf(mp, 1))
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return (EBUSY);
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if (rootvp->v_usecount > 1)
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return (EBUSY);
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_unmount: calling vflush\n");
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#endif
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if (error = vflush(mp, rootvp, flags))
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return (error);
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#ifdef FDESC_DIAGNOSTIC
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vprint("fdesc root", rootvp);
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#endif
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/*
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* Release reference on underlying root vnode
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*/
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vrele(rootvp);
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/*
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* And blow it away for future re-use
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*/
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vgone(rootvp);
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/*
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* Finally, throw away the fdescmount structure
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*/
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free(mp->mnt_data, M_MISCFSMNT);
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mp->mnt_data = 0;
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return 0;
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}
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fdesc_root(mp, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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struct vnode *vp;
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int error;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_root(mp = %x)\n", mp);
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#endif
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/*
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* Return locked reference to root.
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*/
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vp = VFSTOFDESC(mp)->f_root;
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VREF(vp);
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VOP_LOCK(vp);
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*vpp = vp;
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return (0);
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}
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fdesc_quotactl(mp, cmd, uid, arg, p)
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struct mount *mp;
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int cmd;
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uid_t uid;
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caddr_t arg;
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struct proc *p;
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{
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return (EOPNOTSUPP);
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}
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fdesc_statfs(mp, sbp, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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{
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struct filedesc *fdp;
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int lim;
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int i;
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int last;
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int freefd;
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#ifdef FDESC_DIAGNOSTIC
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printf("fdesc_statfs(mp = %x)\n", mp);
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#endif
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/*
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* Compute number of free file descriptors.
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* [ Strange results will ensue if the open file
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* limit is ever reduced below the current number
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* of open files... ]
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*/
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lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
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fdp = p->p_fd;
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last = min(fdp->fd_nfiles, lim);
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freefd = 0;
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for (i = fdp->fd_freefile; i < last; i++)
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if (fdp->fd_ofiles[i] == NULL)
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freefd++;
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/*
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* Adjust for the fact that the fdesc array may not
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* have been fully allocated yet.
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*/
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if (fdp->fd_nfiles < lim)
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freefd += (lim - fdp->fd_nfiles);
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sbp->f_type = MOUNT_FDESC;
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sbp->f_flags = 0;
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sbp->f_fsize = DEV_BSIZE;
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sbp->f_bsize = DEV_BSIZE;
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sbp->f_blocks = 2; /* 1K to keep df happy */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = lim + 1; /* Allow for "." */
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sbp->f_ffree = freefd; /* See comments above */
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if (sbp != &mp->mnt_stat) {
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bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
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bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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}
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return (0);
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}
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fdesc_sync(mp, waitfor)
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struct mount *mp;
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int waitfor;
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{
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return (0);
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}
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fdesc_fhtovp(mp, fhp, vpp)
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struct mount *mp;
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struct fid *fhp;
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struct vnode **vpp;
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{
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/* NFS mounting of fdesc doesn't make sense */
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return (EOPNOTSUPP);
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}
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fdesc_vptofh(vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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/* NFS mounting of fdesc doesn't make sense */
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return (EOPNOTSUPP);
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}
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struct vfsops fdesc_vfsops = {
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fdesc_mount,
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fdesc_start,
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fdesc_unmount,
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fdesc_root,
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fdesc_quotactl,
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fdesc_statfs,
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fdesc_sync,
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fdesc_fhtovp,
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fdesc_vptofh,
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fdesc_init,
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};
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