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/* $OpenBSD: compat_dir.c,v 1.5 2008/08/19 09:49:50 pedro Exp $ */
/*
* Copyright (c) 2000 Constantine Sapuntzakis
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <compat/common/compat_dir.h>
int
readdir_with_callback(fp, off, nbytes, appendfunc, arg)
struct file *fp;
off_t *off;
u_long nbytes;
int (*appendfunc)(void *, struct dirent *, off_t);
void *arg;
{
struct dirent *bdp;
caddr_t inp, buf;
int buflen;
struct uio auio;
struct iovec aiov;
int eofflag = 0;
u_long *cookies = NULL, *cookiep;
int ncookies = 0;
int error, len, reclen;
off_t newoff = *off;
struct vnode *vp;
struct vattr va;
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR)
return (EINVAL);
if ((error = VOP_GETATTR(vp, &va, fp->f_cred, curproc)) != 0)
return (error);
buflen = min(MAXBSIZE, nbytes);
buflen = max(buflen, va.va_blocksize);
buf = malloc(buflen, M_TEMP, M_WAITOK);
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curproc);
if (error) {
free(buf, M_TEMP);
return (error);
}
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 = curproc;
auio.uio_resid = buflen;
auio.uio_offset = newoff;
if (cookies) {
free(cookies, M_TEMP);
cookies = NULL;
}
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &ncookies,
&cookies);
if (error)
goto out;
if ((len = buflen - auio.uio_resid) <= 0)
goto eof;
cookiep = cookies;
inp = buf;
if (cookies) {
/*
* When using cookies, the vfs has the option of reading from
* a different offset than that supplied (UFS truncates the
* offset to a block boundary to make sure that it never reads
* partway through a directory entry, even if the directory
* has been compacted).
*/
while (len > 0 && ncookies > 0 && *cookiep <= newoff) {
bdp = (struct dirent *)inp;
len -= bdp->d_reclen;
inp += bdp->d_reclen;
cookiep++;
ncookies--;
}
}
for (; len > 0; len -= reclen, inp += reclen) {
if (cookiep && ncookies == 0)
break;
bdp = (struct dirent *)inp;
reclen = bdp->d_reclen;
if (len < reclen)
break;
if (reclen & 3) {
error = EFAULT;
goto out;
}
/* Skip holes */
if (bdp->d_fileno != 0) {
if ((error = (*appendfunc) (arg, bdp,
(cookiep) ? *cookiep : (newoff + reclen))) != 0) {
if (error == ENOMEM)
error = 0;
break;
}
}
if (cookiep) {
newoff = *cookiep++;
ncookies--;
} else
newoff += reclen;
}
if (len <= 0 && !eofflag)
goto again;
eof:
out:
if (error == 0)
*off = newoff;
if (cookies)
free(cookies, M_TEMP);
VOP_UNLOCK(vp, 0, curproc);
free(buf, M_TEMP);
return (error);
}
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