625 lines
14 KiB
C
625 lines
14 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_vnops.c,v 1.6 1993/09/07 15:41:18 ws Exp $
|
|
*/
|
|
|
|
/*
|
|
* /dev/fd Filesystem
|
|
*/
|
|
|
|
#include "param.h"
|
|
#include "systm.h"
|
|
#include "types.h"
|
|
#include "time.h"
|
|
#include "proc.h"
|
|
#include "resourcevar.h"
|
|
#include "filedesc.h"
|
|
#include "vnode.h"
|
|
#include "file.h"
|
|
#include "stat.h"
|
|
#include "mount.h"
|
|
#include "namei.h"
|
|
#include "buf.h"
|
|
#include "miscfs/fdesc/fdesc.h"
|
|
|
|
#include "../ufs/dir.h" /* For readdir() XXX */
|
|
|
|
/*
|
|
* vp is the current namei directory
|
|
* ndp is the name to locate in that directory...
|
|
*/
|
|
fdesc_lookup(dvp, ndp, p)
|
|
struct vnode *dvp;
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
char *pname = ndp->ni_ptr;
|
|
int nfiles = p->p_fd->fd_nfiles;
|
|
unsigned fd;
|
|
int error;
|
|
struct vnode *fvp;
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_lookup(%s)\n", pname);
|
|
#endif
|
|
if (ndp->ni_namelen == 1 && *pname == '.') {
|
|
ndp->ni_dvp = dvp;
|
|
ndp->ni_vp = dvp;
|
|
VREF(dvp);
|
|
/*VOP_LOCK(dvp);*/
|
|
return (0);
|
|
}
|
|
|
|
fd = 0;
|
|
while (*pname >= '0' && *pname <= '9') {
|
|
fd = 10 * fd + *pname++ - '0';
|
|
if (fd >= nfiles)
|
|
break;
|
|
}
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_lookup: fd = %d, *pname = %x\n", fd, *pname);
|
|
#endif
|
|
if (*pname == '/') {
|
|
error = ENOTDIR;
|
|
goto bad;
|
|
}
|
|
|
|
if (*pname != '\0') {
|
|
error = ENOENT;
|
|
goto bad;
|
|
}
|
|
|
|
if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) {
|
|
error = EBADF;
|
|
goto bad;
|
|
}
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_lookup: allocate new vnode\n");
|
|
#endif
|
|
error = getnewvnode(VT_FDESC, dvp->v_mount, &fdesc_vnodeops, &fvp);
|
|
if (error)
|
|
goto bad;
|
|
VTOFDESC(fvp)->f_fd = fd;
|
|
/*VTOFDESC(fvp)->f_isroot = 0;*/
|
|
ndp->ni_dvp = dvp;
|
|
ndp->ni_vp = fvp;
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_lookup: newvp = %x\n", fvp);
|
|
#endif
|
|
return (0);
|
|
|
|
bad:;
|
|
ndp->ni_dvp = dvp;
|
|
ndp->ni_vp = NULL;
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_lookup: error = %d\n", error);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
fdesc_open(vp, mode, cred, p)
|
|
struct vnode *vp;
|
|
int mode;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
int dfd;
|
|
int fd;
|
|
|
|
/*
|
|
* Can always open the root (modulo perms)
|
|
*/
|
|
if (vp->v_flag & VROOT)
|
|
return (0);
|
|
|
|
/*
|
|
* XXX Kludge: set p->p_dupfd to contain the value of the
|
|
* the file descriptor being sought for duplication. The error
|
|
* return ensures that the vnode for this device will be released
|
|
* by vn_open. Open will detect this special error and take the
|
|
* actions in dupfdopen. Other callers of vn_open or VOP_OPEN
|
|
* will simply report the error.
|
|
*/
|
|
p->p_dupfd = VTOFDESC(vp)->f_fd; /* XXX */
|
|
return (ENODEV);
|
|
}
|
|
|
|
static int
|
|
fdesc_attr(fd, vap, cred, p)
|
|
int fd;
|
|
struct vattr *vap;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct file *fp;
|
|
int error;
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_attr: fd = %d, nfiles = %d\n", fd, fdp->fd_nfiles);
|
|
#endif
|
|
if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_attr: fp = %x (EBADF)\n", fp);
|
|
#endif
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* Can stat the underlying vnode, but not sockets because
|
|
* they don't use struct vattrs. Well, we could convert from
|
|
* a struct stat back to a struct vattr, later...
|
|
*/
|
|
switch (fp->f_type) {
|
|
case DTYPE_VNODE:
|
|
error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p);
|
|
break;
|
|
|
|
case DTYPE_SOCKET:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
default:
|
|
panic("fdesc attr");
|
|
break;
|
|
}
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_attr: returns error %d\n", error);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
fdesc_getattr(vp, vap, cred, p)
|
|
struct vnode *vp;
|
|
struct vattr *vap;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
unsigned fd;
|
|
int error;
|
|
|
|
if (vp->v_flag & VROOT) {
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_getattr: stat rootdir\n");
|
|
#endif
|
|
bzero((caddr_t) vap, sizeof(*vap));
|
|
vattr_null(vap);
|
|
vap->va_type = VDIR;
|
|
vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
|
|
vap->va_nlink = 2;
|
|
vap->va_uid = 0;
|
|
vap->va_gid = 0;
|
|
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
|
|
vap->va_fileid = 2;
|
|
/* vap->va_qsize = 0; */
|
|
vap->va_size = DEV_BSIZE;
|
|
vap->va_blocksize = DEV_BSIZE;
|
|
microtime(&vap->va_atime);
|
|
vap->va_mtime = vap->va_atime;
|
|
vap->va_ctime = vap->va_ctime;
|
|
vap->va_gen = 0;
|
|
vap->va_flags = 0;
|
|
vap->va_rdev = 0;
|
|
/* vap->va_qbytes = 0; */
|
|
vap->va_bytes = 0;
|
|
return (0);
|
|
}
|
|
|
|
fd = VTOFDESC(vp)->f_fd;
|
|
error = fdesc_attr(fd, vap, cred, p);
|
|
if (error == 0)
|
|
vp->v_type = vap->va_type;
|
|
return (error);
|
|
}
|
|
|
|
fdesc_setattr(vp, vap, cred, p)
|
|
struct vnode *vp;
|
|
struct vattr *vap;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct file *fp;
|
|
unsigned fd;
|
|
int error;
|
|
|
|
/*
|
|
* Can't mess with the root vnode
|
|
*/
|
|
if (vp->v_flag & VROOT)
|
|
return (EACCES);
|
|
|
|
fd = VTOFDESC(vp)->f_fd;
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_setattr: fd = %d, nfiles = %d\n", fd, fdp->fd_nfiles);
|
|
#endif
|
|
if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) {
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_setattr: fp = %x (EBADF)\n", fp);
|
|
#endif
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* Can setattr the underlying vnode, but not sockets!
|
|
*/
|
|
switch (fp->f_type) {
|
|
case DTYPE_VNODE:
|
|
error = VOP_SETATTR((struct vnode *) fp->f_data, vap, cred, p);
|
|
break;
|
|
|
|
case DTYPE_SOCKET:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
default:
|
|
panic("fdesc setattr");
|
|
break;
|
|
}
|
|
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_setattr: returns error %d\n", error);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
fdesc_readdir(vp, uio, cred, eofflagp, cookies, ncookies)
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
int *eofflagp;
|
|
u_int *cookies;
|
|
int ncookies;
|
|
{
|
|
struct filedesc *fdp;
|
|
int ind, i;
|
|
int error;
|
|
|
|
#define UIO_MX 16
|
|
|
|
fdp = uio->uio_procp->p_fd;
|
|
ind = uio->uio_offset / UIO_MX;
|
|
error = 0;
|
|
while (uio->uio_resid > 0 && (!cookies || ncookies > 0)) {
|
|
struct direct d;
|
|
struct direct *dp = &d;
|
|
|
|
if (ind < 2) { /* . or .. */
|
|
bzero((caddr_t) dp, UIO_MX);
|
|
if (ind == 0) {
|
|
strcpy(dp->d_name, ".");
|
|
dp->d_namlen = 1;
|
|
} else if (ind == 1) {
|
|
strcpy(dp->d_name, "..");
|
|
dp->d_namlen = 2;
|
|
} else
|
|
panic("fdesc: ind is negative!");
|
|
|
|
dp->d_reclen = UIO_MX;
|
|
dp->d_ino = 2;
|
|
|
|
/*
|
|
* And ship to userland
|
|
*/
|
|
error = uiomove((caddr_t) dp, UIO_MX, uio);
|
|
if (error)
|
|
break;
|
|
|
|
ind++;
|
|
if (cookies) {
|
|
*cookies++ = ind * UIO_MX;
|
|
ncookies--;
|
|
}
|
|
continue;
|
|
}
|
|
i = ind - 2;
|
|
if (i >= fdp->fd_nfiles) {
|
|
*eofflagp = 1;
|
|
break;
|
|
}
|
|
if (fdp->fd_ofiles[i] != NULL) {
|
|
struct direct d;
|
|
struct direct *dp = &d;
|
|
char *cp = dp->d_name;
|
|
#ifdef FDESC_FILEID
|
|
struct vattr va;
|
|
#endif
|
|
int j;
|
|
|
|
bzero((caddr_t) dp, UIO_MX);
|
|
|
|
/*
|
|
* Generate an ASCII representation of the name.
|
|
* This can cope with fds in the range 0..99999
|
|
*/
|
|
cp++;
|
|
if (i > 10) cp++;
|
|
if (i > 100) cp++;
|
|
if (i > 1000) cp++;
|
|
if (i > 10000) cp++;
|
|
if (i > 100000) panic("fdesc_readdir");
|
|
dp->d_namlen = cp - dp->d_name;
|
|
*cp = '\0';
|
|
j = i;
|
|
do {
|
|
*--cp = j % 10 + '0';
|
|
j /= 10;
|
|
} while (j > 0);
|
|
/*
|
|
* Fill in the remaining fields
|
|
*/
|
|
dp->d_reclen = UIO_MX;
|
|
dp->d_ino = i + 3;
|
|
#ifdef FDESC_FILEID
|
|
/*
|
|
* If we want the file ids to match the
|
|
* we must call getattr on the underlying file.
|
|
* fdesc_attr may return an error, in which case
|
|
* we ignore the returned file id.
|
|
*/
|
|
error = fdesc_attr(i, &va, cred, p);
|
|
if (error == 0)
|
|
dp->d_ino = va.va_fileid;
|
|
#endif
|
|
/*
|
|
* And ship to userland
|
|
*/
|
|
error = uiomove((caddr_t) dp, UIO_MX, uio);
|
|
if (error)
|
|
break;
|
|
if (cookies) {
|
|
*cookies++ = (ind + 1) * UIO_MX;
|
|
ncookies--;
|
|
}
|
|
}
|
|
ind++;
|
|
}
|
|
|
|
uio->uio_offset = ind * UIO_MX;
|
|
return (error);
|
|
}
|
|
|
|
fdesc_inactive(vp, p)
|
|
struct vnode *vp;
|
|
struct proc *p;
|
|
{
|
|
/*
|
|
* Clear out the v_type field to avoid
|
|
* nasty things happening in vgone().
|
|
*/
|
|
vp->v_type = VNON;
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
printf("fdesc_inactive(%x)\n", vp);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a /dev/fd vnode.
|
|
*/
|
|
/* ARGSUSED */
|
|
void
|
|
fdesc_print(vp)
|
|
struct vnode *vp;
|
|
{
|
|
printf("tag VT_FDESC, fdesc vnode\n");
|
|
}
|
|
|
|
/*
|
|
* /dev/fd vnode unsupported operation
|
|
*/
|
|
fdesc_enotsupp()
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* /dev/fd "should never get here" operation
|
|
*/
|
|
fdesc_badop()
|
|
{
|
|
panic("fdesc: bad op");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* /dev/fd vnode null operation
|
|
*/
|
|
fdesc_nullop()
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
#define fdesc_create ((int (*) __P(( \
|
|
struct nameidata *ndp, \
|
|
struct vattr *vap, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_mknod ((int (*) __P(( \
|
|
struct nameidata *ndp, \
|
|
struct vattr *vap, \
|
|
struct ucred *cred, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_close ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
int fflag, \
|
|
struct ucred *cred, \
|
|
struct proc *p))) nullop)
|
|
#define fdesc_access ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
int mode, \
|
|
struct ucred *cred, \
|
|
struct proc *p))) nullop)
|
|
#define fdesc_read ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
struct uio *uio, \
|
|
int ioflag, \
|
|
struct ucred *cred))) fdesc_enotsupp)
|
|
#define fdesc_write ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
struct uio *uio, \
|
|
int ioflag, \
|
|
struct ucred *cred))) fdesc_enotsupp)
|
|
#define fdesc_ioctl ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
int command, \
|
|
caddr_t data, \
|
|
int fflag, \
|
|
struct ucred *cred, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_select ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
int which, \
|
|
int fflags, \
|
|
struct ucred *cred, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_mmap ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
int fflags, \
|
|
struct ucred *cred, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_fsync ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
int fflags, \
|
|
struct ucred *cred, \
|
|
int waitfor, \
|
|
struct proc *p))) nullop)
|
|
#define fdesc_seek ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
off_t oldoff, \
|
|
off_t newoff, \
|
|
struct ucred *cred))) nullop)
|
|
#define fdesc_remove ((int (*) __P(( \
|
|
struct nameidata *ndp, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_link ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
struct nameidata *ndp, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_rename ((int (*) __P(( \
|
|
struct nameidata *fndp, \
|
|
struct nameidata *tdnp, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_mkdir ((int (*) __P(( \
|
|
struct nameidata *ndp, \
|
|
struct vattr *vap, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_rmdir ((int (*) __P(( \
|
|
struct nameidata *ndp, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_symlink ((int (*) __P(( \
|
|
struct nameidata *ndp, \
|
|
struct vattr *vap, \
|
|
char *target, \
|
|
struct proc *p))) fdesc_enotsupp)
|
|
#define fdesc_readlink ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
struct uio *uio, \
|
|
struct ucred *cred))) fdesc_enotsupp)
|
|
#define fdesc_abortop ((int (*) __P(( \
|
|
struct nameidata *ndp))) nullop)
|
|
#ifdef FDESC_DIAGNOSTIC
|
|
int fdesc_reclaim(vp)
|
|
struct vnode *vp;
|
|
{
|
|
printf("fdesc_reclaim(%x)\n", vp);
|
|
return (0);
|
|
}
|
|
#else
|
|
#define fdesc_reclaim ((int (*) __P(( \
|
|
struct vnode *vp))) nullop)
|
|
#endif
|
|
#define fdesc_lock ((int (*) __P(( \
|
|
struct vnode *vp))) nullop)
|
|
#define fdesc_unlock ((int (*) __P(( \
|
|
struct vnode *vp))) nullop)
|
|
#define fdesc_bmap ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
daddr_t bn, \
|
|
struct vnode **vpp, \
|
|
daddr_t *bnp))) fdesc_badop)
|
|
#define fdesc_strategy ((int (*) __P(( \
|
|
struct buf *bp))) fdesc_badop)
|
|
#define fdesc_islocked ((int (*) __P(( \
|
|
struct vnode *vp))) nullop)
|
|
#define fdesc_advlock ((int (*) __P(( \
|
|
struct vnode *vp, \
|
|
caddr_t id, \
|
|
int op, \
|
|
struct flock *fl, \
|
|
int flags))) fdesc_enotsupp)
|
|
|
|
struct vnodeops fdesc_vnodeops = {
|
|
fdesc_lookup, /* lookup */
|
|
fdesc_create, /* create */
|
|
fdesc_mknod, /* mknod */
|
|
fdesc_open, /* open */
|
|
fdesc_close, /* close */
|
|
fdesc_access, /* access */
|
|
fdesc_getattr, /* getattr */
|
|
fdesc_setattr, /* setattr */
|
|
fdesc_read, /* read */
|
|
fdesc_write, /* write */
|
|
fdesc_ioctl, /* ioctl */
|
|
fdesc_select, /* select */
|
|
fdesc_mmap, /* mmap */
|
|
fdesc_fsync, /* fsync */
|
|
fdesc_seek, /* seek */
|
|
fdesc_remove, /* remove */
|
|
fdesc_link, /* link */
|
|
fdesc_rename, /* rename */
|
|
fdesc_mkdir, /* mkdir */
|
|
fdesc_rmdir, /* rmdir */
|
|
fdesc_symlink, /* symlink */
|
|
fdesc_readdir, /* readdir */
|
|
fdesc_readlink, /* readlink */
|
|
fdesc_abortop, /* abortop */
|
|
fdesc_inactive, /* inactive */
|
|
fdesc_reclaim, /* reclaim */
|
|
fdesc_lock, /* lock */
|
|
fdesc_unlock, /* unlock */
|
|
fdesc_bmap, /* bmap */
|
|
fdesc_strategy, /* strategy */
|
|
fdesc_print, /* print */
|
|
fdesc_islocked, /* islocked */
|
|
fdesc_advlock, /* advlock */
|
|
};
|