80cc38a1af
between creation of a file descriptor and close(2) when using kernel assisted threads. What we do is stick descriptors in the table, but mark them as "larval". This causes essentially everything to treat it as a non-existent descriptor, except for fdalloc(), which sees a filled slot so that it won't (incorrectly) allocate it again. When a descriptor is fully constructed, the code that has constructed it marks it as "mature" (which actually clears the "larval" flag), and things continue to work as normal. While here, gather all the code that gets a descriptor from the table into a fd_getfile() function, and call it, rather than having the same (sometimes incorrect) code copied all over the place.
229 lines
6.0 KiB
C
229 lines
6.0 KiB
C
/* $NetBSD: vfs_syscalls_12.c,v 1.9 2001/06/14 20:32:41 thorpej Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* From: @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/dirent.h>
|
|
|
|
#include <sys/syscallargs.h>
|
|
|
|
static void cvtstat __P((struct stat *, struct stat12 *));
|
|
|
|
/*
|
|
* Convert from a new to an old stat structure.
|
|
*/
|
|
static void
|
|
cvtstat(st, ost)
|
|
struct stat *st;
|
|
struct stat12 *ost;
|
|
{
|
|
|
|
ost->st_dev = st->st_dev;
|
|
ost->st_ino = st->st_ino;
|
|
ost->st_mode = st->st_mode & 0xffff;
|
|
if (st->st_nlink >= (1 << 15))
|
|
ost->st_nlink = (1 << 15) - 1;
|
|
else
|
|
ost->st_nlink = st->st_nlink;
|
|
ost->st_uid = st->st_uid;
|
|
ost->st_gid = st->st_gid;
|
|
ost->st_rdev = st->st_rdev;
|
|
ost->st_atimespec = st->st_atimespec;
|
|
ost->st_mtimespec = st->st_mtimespec;
|
|
ost->st_ctimespec = st->st_ctimespec;
|
|
ost->st_size = st->st_size;
|
|
ost->st_blocks = st->st_blocks;
|
|
ost->st_blksize = st->st_blksize;
|
|
ost->st_flags = st->st_flags;
|
|
ost->st_gen = st->st_gen;
|
|
}
|
|
|
|
/*
|
|
* Read a block of directory entries in a file system independent format.
|
|
*/
|
|
int
|
|
compat_12_sys_getdirentries(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct compat_12_sys_getdirentries_args /* {
|
|
syscallarg(int) fd;
|
|
syscallarg(char *) buf;
|
|
syscallarg(u_int) count;
|
|
syscallarg(long *) basep;
|
|
} */ *uap = v;
|
|
struct file *fp;
|
|
int error, done;
|
|
long loff;
|
|
|
|
/* getvnode() will use the descriptor for us */
|
|
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
|
|
return error;
|
|
if ((fp->f_flag & FREAD) == 0) {
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
|
|
loff = fp->f_offset;
|
|
|
|
error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE,
|
|
SCARG(uap, count), &done, p, 0, 0);
|
|
|
|
error = copyout(&loff, SCARG(uap, basep), sizeof(long));
|
|
*retval = done;
|
|
out:
|
|
FILE_UNUSE(fp, p);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Get file status; this version follows links.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
compat_12_sys_stat(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct compat_12_sys_stat_args /* {
|
|
syscallarg(const char *) path;
|
|
syscallarg(struct stat12 *) ub;
|
|
} */ *uap = v;
|
|
struct stat sb;
|
|
struct stat12 osb;
|
|
int error;
|
|
struct nameidata nd;
|
|
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
|
|
SCARG(uap, path), p);
|
|
if ((error = namei(&nd)) != 0)
|
|
return (error);
|
|
error = vn_stat(nd.ni_vp, &sb, p);
|
|
vput(nd.ni_vp);
|
|
if (error)
|
|
return (error);
|
|
cvtstat(&sb, &osb);
|
|
error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
|
|
return (error);
|
|
}
|
|
|
|
|
|
/*
|
|
* Get file status; this version does not follow links.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
compat_12_sys_lstat(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct compat_12_sys_lstat_args /* {
|
|
syscallarg(const char *) path;
|
|
syscallarg(struct stat12 *) ub;
|
|
} */ *uap = v;
|
|
struct stat sb;
|
|
struct stat12 osb;
|
|
int error;
|
|
struct nameidata nd;
|
|
|
|
NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
|
|
SCARG(uap, path), p);
|
|
if ((error = namei(&nd)) != 0)
|
|
return (error);
|
|
error = vn_stat(nd.ni_vp, &sb, p);
|
|
vput(nd.ni_vp);
|
|
if (error)
|
|
return (error);
|
|
cvtstat(&sb, &osb);
|
|
error = copyout(&osb, SCARG(uap, ub), sizeof (osb));
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
compat_12_sys_fstat(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct compat_12_sys_fstat_args /* {
|
|
syscallarg(int) fd;
|
|
syscallarg(struct stat12 *) sb;
|
|
} */ *uap = v;
|
|
int fd = SCARG(uap, fd);
|
|
struct filedesc *fdp = p->p_fd;
|
|
struct file *fp;
|
|
struct stat ub;
|
|
struct stat12 oub;
|
|
int error;
|
|
|
|
if ((fp = fd_getfile(fdp, fd)) == NULL)
|
|
return (EBADF);
|
|
|
|
FILE_USE(fp);
|
|
error = (*fp->f_ops->fo_stat)(fp, &ub, p);
|
|
FILE_UNUSE(fp, p);
|
|
|
|
if (error == 0) {
|
|
cvtstat(&ub, &oub);
|
|
error = copyout(&oub, SCARG(uap, sb), sizeof (oub));
|
|
}
|
|
return (error);
|
|
}
|