306 lines
7.3 KiB
C
306 lines
7.3 KiB
C
/* $NetBSD: fdesc_vfsops.c,v 1.67 2007/07/17 11:19:34 pooka Exp $ */
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/*
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* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. 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. 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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* @(#)fdesc_vfsops.c 8.10 (Berkeley) 5/14/95
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*
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* #Id: fdesc_vfsops.c,v 1.9 1993/04/06 15:28:33 jsp 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: fdesc_vfsops.c,v 1.67 2007/07/17 11:19:34 pooka Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_compat_netbsd.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/time.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/dirent.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <sys/kauth.h>
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#include <miscfs/fdesc/fdesc.h>
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int fdesc_mount(struct mount *, const char *, void *, size_t *,
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struct nameidata *, struct lwp *);
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int fdesc_start(struct mount *, int, struct lwp *);
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int fdesc_unmount(struct mount *, int, struct lwp *);
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int fdesc_quotactl(struct mount *, int, uid_t, void *,
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struct lwp *);
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int fdesc_statvfs(struct mount *, struct statvfs *, struct lwp *);
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int fdesc_sync(struct mount *, int, kauth_cred_t, struct lwp *);
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int fdesc_vget(struct mount *, ino_t, struct vnode **);
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/*
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* Mount the per-process file descriptors (/dev/fd)
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*/
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int
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fdesc_mount(struct mount *mp, const char *path, void *data, size_t *data_len,
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struct nameidata *ndp, struct lwp *l)
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{
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int error = 0;
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struct fdescmount *fmp;
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struct vnode *rvp;
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if (mp->mnt_flag & MNT_GETARGS) {
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*data_len = 0;
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return 0;
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}
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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_UFSMNT, M_WAITOK); /* XXX */
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rvp->v_type = VDIR;
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rvp->v_flag |= VROOT;
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fmp->f_root = rvp;
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mp->mnt_stat.f_namemax = MAXNAMLEN;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = fmp;
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vfs_getnewfsid(mp);
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error = set_statvfs_info(path, UIO_USERSPACE, "fdesc", UIO_SYSSPACE,
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mp->mnt_op->vfs_name, mp, l);
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VOP_UNLOCK(rvp, 0);
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return error;
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}
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int
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fdesc_start(struct mount *mp, int flags,
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struct lwp *l)
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{
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return (0);
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}
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int
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fdesc_unmount(struct mount *mp, int mntflags, struct lwp *l)
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{
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int error;
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int flags = 0;
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struct vnode *rtvp = VFSTOFDESC(mp)->f_root;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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if (rtvp->v_usecount > 1 && (mntflags & MNT_FORCE) == 0)
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return (EBUSY);
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if ((error = vflush(mp, rtvp, flags)) != 0)
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return (error);
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/*
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* Release reference on underlying root vnode
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*/
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vrele(rtvp);
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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(rtvp);
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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_UFSMNT); /* XXX */
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mp->mnt_data = 0;
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return (0);
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}
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int
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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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/*
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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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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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*vpp = vp;
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return (0);
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}
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int
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fdesc_quotactl(struct mount *mp, int cmd, uid_t uid,
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void *arg, struct lwp *l)
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{
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return (EOPNOTSUPP);
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}
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int
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fdesc_statvfs(mp, sbp, l)
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struct mount *mp;
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struct statvfs *sbp;
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struct lwp *l;
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{
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struct filedesc *fdp;
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struct proc *p;
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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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/*
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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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p = l->l_proc;
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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_bsize = DEV_BSIZE;
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sbp->f_frsize = DEV_BSIZE;
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sbp->f_iosize = 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_bresvd = 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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sbp->f_favail = freefd; /* See comments above */
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sbp->f_fresvd = 0;
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copy_statvfs_info(sbp, mp);
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return (0);
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}
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/*ARGSUSED*/
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int
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fdesc_sync(struct mount *mp, int waitfor,
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kauth_cred_t uc, struct lwp *l)
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{
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return (0);
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}
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/*
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* Fdesc flat namespace lookup.
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* Currently unsupported.
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*/
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int
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fdesc_vget(struct mount *mp, ino_t ino,
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struct vnode **vpp)
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{
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return (EOPNOTSUPP);
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}
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SYSCTL_SETUP(sysctl_vfs_fdesc_setup, "sysctl vfs.fdesc subtree setup")
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{
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "vfs", NULL,
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NULL, 0, NULL, 0,
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CTL_VFS, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "fdesc",
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SYSCTL_DESCR("File-descriptor file system"),
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NULL, 0, NULL, 0,
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CTL_VFS, 7, CTL_EOL);
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/*
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* XXX the "7" above could be dynamic, thereby eliminating one
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* more instance of the "number to vfs" mapping problem, but
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* "7" is the order as taken from sys/mount.h
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*/
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}
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extern const struct vnodeopv_desc fdesc_vnodeop_opv_desc;
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const struct vnodeopv_desc * const fdesc_vnodeopv_descs[] = {
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&fdesc_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops fdesc_vfsops = {
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MOUNT_FDESC,
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0,
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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_statvfs,
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fdesc_sync,
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fdesc_vget,
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(void *)eopnotsupp, /* vfs_fhtovp */
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(void *)eopnotsupp, /* vfs_vptofh */
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fdesc_init,
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NULL,
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fdesc_done,
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NULL, /* vfs_mountroot */
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(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
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vfs_stdextattrctl,
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vfs_stdsuspendctl,
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fdesc_vnodeopv_descs,
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0,
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{ NULL, NULL},
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};
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VFS_ATTACH(fdesc_vfsops);
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