265 lines
7.0 KiB
C
265 lines
7.0 KiB
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.
|
|
*
|
|
* @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
|
|
*
|
|
* $Id: fdesc_vfsops.c,v 1.16 1998/09/07 13:17:00 bde Exp $
|
|
*/
|
|
|
|
/*
|
|
* /dev/fd Filesystem
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/malloc.h>
|
|
#include <miscfs/fdesc/fdesc.h>
|
|
|
|
static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
|
|
|
|
static int fdesc_mount __P((struct mount *mp, char *path, caddr_t data,
|
|
struct nameidata *ndp, struct proc *p));
|
|
static int fdesc_start __P((struct mount *mp, int flags, struct proc *p));
|
|
static int fdesc_unmount __P((struct mount *mp, int mntflags,
|
|
struct proc *p));
|
|
static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp,
|
|
struct proc *p));
|
|
static int fdesc_sync __P((struct mount *mp, int waitfor,
|
|
struct ucred *cred, struct proc *p));
|
|
|
|
/*
|
|
* Mount the per-process file descriptors (/dev/fd)
|
|
*/
|
|
static 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;
|
|
u_int 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_FDESCMNT, 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"));
|
|
(void)fdesc_statfs(mp, &mp->mnt_stat, p);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
fdesc_start(mp, flags, p)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
fdesc_unmount(mp, mntflags, p)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
int flags = 0;
|
|
struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
|
|
|
|
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...
|
|
*/
|
|
if (rootvp->v_usecount > 1)
|
|
return (EBUSY);
|
|
if (error = vflush(mp, rootvp, flags))
|
|
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_FDESCMNT); /* XXX */
|
|
mp->mnt_data = 0;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
fdesc_root(mp, vpp)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct proc *p = curproc; /* 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);
|
|
}
|
|
|
|
static 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)
|
|
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);
|
|
}
|
|
|
|
static int
|
|
fdesc_sync(mp, waitfor, cred, p)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
#define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
|
|
struct sockaddr *, 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 *, ino_t, struct vnode **))) \
|
|
eopnotsupp)
|
|
#define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
|
|
|
|
static 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,
|
|
};
|
|
|
|
VFS_SET(fdesc_vfsops, fdesc, VFCF_SYNTHETIC);
|