NetBSD-5.0.2/sys/compat/linux/common/linux_file64.c
/* $NetBSD: linux_file64.c,v 1.48 2008/06/24 11:18:15 ad Exp $ */
/*-
* Copyright (c) 1995, 1998, 2000, 2008 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.
*
* 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 1.48 2008/06/24 11:18:15 ad 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/namei.h>
#include <sys/vfs_syscalls.h>
#include <sys/vnode.h>
#include <sys/tty.h>
#include <sys/conf.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/common/linux_ipc.h>
#include <compat/linux/common/linux_sem.h>
#include <compat/linux/linux_syscallargs.h>
#ifndef alpha
static void bsd_to_linux_stat(struct stat *, struct linux_stat64 *);
/*
* 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(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;
# ifdef LINUX_STAT64_HAS_NSEC
lsp->lst_atime_nsec = bsp->st_atimensec;
lsp->lst_mtime_nsec = bsp->st_mtimensec;
lsp->lst_ctime_nsec = bsp->st_ctimensec;
# endif
# 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(struct lwp *l, const struct linux_sys_fstat64_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(struct linux_stat64 *) sp;
} */
struct linux_stat64 tmplst;
struct stat tmpst;
int error;
error = do_sys_fstat(SCARG(uap, fd), &tmpst);
if (error != 0)
return error;
bsd_to_linux_stat(&tmpst, &tmplst);
return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst);
}
static int
linux_do_stat64(struct lwp *l, const struct linux_sys_stat64_args *uap, register_t *retval, int flags)
{
struct linux_stat64 tmplst;
struct stat tmpst;
int error;
error = do_sys_stat(SCARG(uap, path), flags, &tmpst);
if (error != 0)
return error;
bsd_to_linux_stat(&tmpst, &tmplst);
return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst);
}
int
linux_sys_stat64(struct lwp *l, const struct linux_sys_stat64_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct linux_stat64 *) sp;
} */
return linux_do_stat64(l, uap, retval, FOLLOW);
}
int
linux_sys_lstat64(struct lwp *l, const struct linux_sys_lstat64_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct linux_stat64 *) sp;
} */
return linux_do_stat64(l, (const void *)uap, retval, NOFOLLOW);
}
int
linux_sys_truncate64(struct lwp *l, const struct linux_sys_truncate64_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(off_t) length;
} */
struct sys_truncate_args ta;
/* 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(struct lwp *l, const struct linux_sys_ftruncate64_args *uap, register_t *retval)
{
/* {
syscallarg(unsigned int) fd;
syscallarg(off_t) length;
} */
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);
}
#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(struct lwp *l, const struct linux_sys_getdents64_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(struct linux_dirent64 *) dent;
syscallarg(unsigned int) count;
} */
struct dirent *bdp;
struct vnode *vp;
char *inp, *tbuf; /* BSD-format */
int len, reclen; /* BSD-format */
char *outp; /* Linux-format */
int resid, linux_reclen = 0; /* Linux-format */
file_t *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;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(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, l->l_cred)))
goto out1;
nbytes = SCARG(uap, count);
buflen = min(MAXBSIZE, nbytes);
if (buflen < va.va_blocksize)
buflen = va.va_blocksize;
tbuf = malloc(buflen, M_TEMP, M_WAITOK);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
off = fp->f_offset;
again:
aiov.iov_base = tbuf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_resid = buflen;
auio.uio_offset = off;
UIO_SETUP_SYSSPACE(&auio);
/*
* 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 = tbuf;
outp = (void *)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 */
if (cookie)
off = *cookie++;
else
off += reclen;
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;
}
if (cookie)
off = *cookie++; /* each entry points to next */
else
off += reclen;
/*
* 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((void *)&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 == (void *)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(tbuf, M_TEMP);
out1:
fd_putfile(SCARG(uap, fd));
return error;
}