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NetBSD/sys/compat/linux/common/linux_file64.c

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/* $NetBSD: linux_file64.c,v 1.22 2003/08/10 20:16:27 jdolecek Exp $ */
/*-
* Copyright (c) 1995, 1998, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Linux 64bit filesystem calls. Used on 32bit archs, not used on 64bit ones.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_file64.c,v 1.22 2003/08/10 20:16:27 jdolecek Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/tty.h>
#include <sys/conf.h>
#include <sys/sa.h>
#include <sys/syscallargs.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_fcntl.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_machdep.h>
#include <compat/linux/common/linux_dirent.h>
#include <compat/linux/linux_syscallargs.h>
#ifndef alpha
static void bsd_to_linux_stat __P((struct stat *, struct linux_stat64 *));
static int linux_do_stat64 __P((struct lwp *, void *, register_t *, int));
/*
* Convert a NetBSD stat structure to a Linux stat structure.
* Only the order of the fields and the padding in the structure
* is different. linux_fakedev is a machine-dependent function
* which optionally converts device driver major/minor numbers
* (XXX horrible, but what can you do against code that compares
* things against constant major device numbers? sigh)
*/
static void
bsd_to_linux_stat(bsp, lsp)
struct stat *bsp;
struct linux_stat64 *lsp;
{
lsp->lst_dev = linux_fakedev(bsp->st_dev, 0);
lsp->lst_ino = bsp->st_ino;
lsp->lst_mode = (linux_mode_t)bsp->st_mode;
if (bsp->st_nlink >= (1 << 15))
lsp->lst_nlink = (1 << 15) - 1;
else
lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink;
lsp->lst_uid = bsp->st_uid;
lsp->lst_gid = bsp->st_gid;
lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1);
lsp->lst_size = bsp->st_size;
lsp->lst_blksize = bsp->st_blksize;
lsp->lst_blocks = bsp->st_blocks;
lsp->lst_atime = bsp->st_atime;
lsp->lst_mtime = bsp->st_mtime;
lsp->lst_ctime = bsp->st_ctime;
#if LINUX_STAT64_HAS_BROKEN_ST_INO
lsp->__lst_ino = (linux_ino_t) bsp->st_ino;
#endif
}
/*
* The stat functions below are plain sailing. stat and lstat are handled
* by one function to avoid code duplication.
*/
int
linux_sys_fstat64(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct linux_sys_fstat64_args /* {
syscallarg(int) fd;
syscallarg(struct linux_stat64 *) sp;
} */ *uap = v;
struct proc *p = l->l_proc;
struct sys___fstat13_args fsa;
struct linux_stat64 tmplst;
struct stat *st,tmpst;
caddr_t sg;
int error;
sg = stackgap_init(p, 0);
st = stackgap_alloc(p, &sg, sizeof (struct stat));
SCARG(&fsa, fd) = SCARG(uap, fd);
SCARG(&fsa, sb) = st;
if ((error = sys___fstat13(l, &fsa, retval)))
return error;
if ((error = copyin(st, &tmpst, sizeof tmpst)))
return error;
bsd_to_linux_stat(&tmpst, &tmplst);
if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst)))
return error;
return 0;
}
static int
linux_do_stat64(l, v, retval, dolstat)
struct lwp *l;
void *v;
register_t *retval;
int dolstat;
{
struct proc *p = l->l_proc;
struct sys___stat13_args sa;
struct linux_stat64 tmplst;
struct stat *st, tmpst;
caddr_t sg;
int error;
struct linux_sys_stat64_args *uap = v;
sg = stackgap_init(p, 0);
st = stackgap_alloc(p, &sg, sizeof (struct stat));
CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
SCARG(&sa, ub) = st;
SCARG(&sa, path) = SCARG(uap, path);
if ((error = (dolstat ? sys___lstat13(l, &sa, retval) :
sys___stat13(l, &sa, retval))))
return error;
if ((error = copyin(st, &tmpst, sizeof tmpst)))
return error;
bsd_to_linux_stat(&tmpst, &tmplst);
if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst)))
return error;
return 0;
}
int
linux_sys_stat64(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct linux_sys_stat64_args /* {
syscallarg(const char *) path;
syscallarg(struct linux_stat64 *) sp;
} */ *uap = v;
return linux_do_stat64(l, uap, retval, 0);
}
int
linux_sys_lstat64(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct linux_sys_lstat64_args /* {
syscallarg(const char *) path;
syscallarg(struct linux_stat64 *) sp;
} */ *uap = v;
return linux_do_stat64(l, uap, retval, 1);
}
int
linux_sys_truncate64(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct linux_sys_truncate64_args /* {
syscallarg(const char *) path;
syscallarg(off_t) length;
} */ *uap = v;
struct sys_truncate_args ta;
struct proc *p = l->l_proc;
caddr_t sg = stackgap_init(p, 0);
CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
/* Linux doesn't have the 'pad' pseudo-parameter */
SCARG(&ta, path) = SCARG(uap, path);
SCARG(&ta, pad) = 0;
SCARG(&ta, length) = SCARG(uap, length);
return sys_truncate(l, &ta, retval);
}
int
linux_sys_ftruncate64(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct linux_sys_ftruncate64_args /* {
syscallarg(unsigned int) fd;
syscallarg(off_t) length;
} */ *uap = v;
struct sys_ftruncate_args ta;
/* Linux doesn't have the 'pad' pseudo-parameter */
SCARG(&ta, fd) = SCARG(uap, fd);
SCARG(&ta, pad) = 0;
SCARG(&ta, length) = SCARG(uap, length);
return sys_ftruncate(l, &ta, retval);
}
#if !defined(__m68k__)
static void bsd_to_linux_flock64 __P((struct linux_flock64 *,
const struct flock *));
static void linux_to_bsd_flock64 __P((struct flock *,
const struct linux_flock64 *));
static void
bsd_to_linux_flock64(lfp, bfp)
struct linux_flock64 *lfp;
const struct flock *bfp;
{
lfp->l_start = bfp->l_start;
lfp->l_len = bfp->l_len;
lfp->l_pid = bfp->l_pid;
lfp->l_whence = bfp->l_whence;
switch (bfp->l_type) {
case F_RDLCK:
lfp->l_type = LINUX_F_RDLCK;
break;
case F_UNLCK:
lfp->l_type = LINUX_F_UNLCK;
break;
case F_WRLCK:
lfp->l_type = LINUX_F_WRLCK;
break;
}
}
static void
linux_to_bsd_flock64(bfp, lfp)
struct flock *bfp;
const struct linux_flock64 *lfp;
{
bfp->l_start = lfp->l_start;
bfp->l_len = lfp->l_len;
bfp->l_pid = lfp->l_pid;
bfp->l_whence = lfp->l_whence;
switch (lfp->l_type) {
case LINUX_F_RDLCK:
bfp->l_type = F_RDLCK;
break;
case LINUX_F_UNLCK:
bfp->l_type = F_UNLCK;
break;
case LINUX_F_WRLCK:
bfp->l_type = F_WRLCK;
break;
}
}
int
linux_sys_fcntl64(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct linux_sys_fcntl64_args /* {
syscallarg(int) fd;
syscallarg(int) cmd;
syscallarg(void *) arg;
} */ *uap = v;
struct proc *p = l->l_proc;
struct sys_fcntl_args fca;
struct linux_flock64 lfl;
struct flock bfl, *bfp;
int error;
caddr_t sg;
void *arg = SCARG(uap, arg);
int cmd = SCARG(uap, cmd);
int fd = SCARG(uap, fd);
switch (cmd) {
case LINUX_F_GETLK64:
sg = stackgap_init(p, 0);
bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp);
if ((error = copyin(arg, &lfl, sizeof lfl)) != 0)
return error;
linux_to_bsd_flock64(&bfl, &lfl);
if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0)
return error;
SCARG(&fca, fd) = fd;
SCARG(&fca, cmd) = F_GETLK;
SCARG(&fca, arg) = bfp;
if ((error = sys_fcntl(l, &fca, retval)) != 0)
return error;
if ((error = copyin(bfp, &bfl, sizeof bfl)) != 0)
return error;
bsd_to_linux_flock64(&lfl, &bfl);
return copyout(&lfl, arg, sizeof lfl);
case LINUX_F_SETLK64:
case LINUX_F_SETLKW64:
cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW);
if ((error = copyin(arg, &lfl, sizeof lfl)) != 0)
return error;
linux_to_bsd_flock64(&bfl, &lfl);
sg = stackgap_init(p, 0);
bfp = (struct flock *) stackgap_alloc(p, &sg, sizeof *bfp);
if ((error = copyout(&bfl, bfp, sizeof bfl)) != 0)
return error;
SCARG(&fca, fd) = fd;
SCARG(&fca, cmd) = cmd;
SCARG(&fca, arg) = bfp;
return sys_fcntl(l, &fca, retval);
default:
return linux_sys_fcntl(l, v, retval);
}
}
#endif /* !m68k */
#endif /* !alpha */
/*
* Linux 'readdir' call. This code is mostly taken from the
* SunOS getdents call (see compat/sunos/sunos_misc.c), though
* an attempt has been made to keep it a little cleaner.
*
* The d_off field contains the offset of the next valid entry,
* unless the older Linux getdents(2), which used to have it set
* to the offset of the entry itself. This function also doesn't
* need to deal with the old count == 1 glibc problem.
*
* Read in BSD-style entries, convert them, and copy them out.
*
* Note that this doesn't handle union-mounted filesystems.
*/
int
linux_sys_getdents64(l, v, retval)
struct lwp *l;
void *v;
register_t *retval;
{
struct linux_sys_getdents_args /* {
syscallarg(int) fd;
syscallarg(struct linux_dirent64 *) dent;
syscallarg(unsigned int) count;
} */ *uap = v;
struct proc *p = l->l_proc;
struct dirent *bdp;
struct vnode *vp;
caddr_t inp, buf; /* BSD-format */
int len, reclen; /* BSD-format */
caddr_t outp; /* Linux-format */
int resid, linux_reclen = 0; /* Linux-format */
struct file *fp;
struct uio auio;
struct iovec aiov;
struct linux_dirent64 idb;
off_t off; /* true file offset */
int buflen, error, eofflag, nbytes;
struct vattr va;
off_t *cookiebuf = NULL, *cookie;
int ncookies;
/* 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 out1;
}
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR) {
error = EINVAL;
goto out1;
}
if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)))
goto out1;
nbytes = SCARG(uap, count);
buflen = min(MAXBSIZE, nbytes);
if (buflen < va.va_blocksize)
buflen = va.va_blocksize;
buf = malloc(buflen, M_TEMP, M_WAITOK);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
off = fp->f_offset;
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = p;
auio.uio_resid = buflen;
auio.uio_offset = off;
/*
* First we read into the malloc'ed buffer, then
* we massage it into user space, one record at a time.
*/
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
&ncookies);
if (error)
goto out;
inp = buf;
outp = (caddr_t)SCARG(uap, dent);
resid = nbytes;
if ((len = buflen - auio.uio_resid) == 0)
goto eof;
for (cookie = cookiebuf; len > 0; len -= reclen) {
bdp = (struct dirent *)inp;
reclen = bdp->d_reclen;
if (reclen & 3)
panic("linux_readdir");
if (bdp->d_fileno == 0) {
inp += reclen; /* it is a hole; squish it out */
off = *cookie++;
continue;
}
linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen);
if (reclen > len || resid < linux_reclen) {
/* entry too big for buffer, so just stop */
outp++;
break;
}
off = *cookie++; /* each entry points to next */
/*
* Massage in place to make a Linux-shaped dirent (otherwise
* we have to worry about touching user memory outside of
* the copyout() call).
*/
idb.d_ino = bdp->d_fileno;
idb.d_type = bdp->d_type;
idb.d_off = off;
idb.d_reclen = (u_short)linux_reclen;
strcpy(idb.d_name, bdp->d_name);
if ((error = copyout((caddr_t)&idb, outp, linux_reclen)))
goto out;
/* advance past this real entry */
inp += reclen;
/* advance output past Linux-shaped entry */
outp += linux_reclen;
resid -= linux_reclen;
}
/* if we squished out the whole block, try again */
if (outp == (caddr_t)SCARG(uap, dent))
goto again;
fp->f_offset = off; /* update the vnode offset */
eof:
*retval = nbytes - resid;
out:
VOP_UNLOCK(vp, 0);
if (cookiebuf)
free(cookiebuf, M_TEMP);
free(buf, M_TEMP);
out1:
FILE_UNUSE(fp, p);
return error;
}
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