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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "daemon.h"
#include "actions.h"
int
do_fallocate (const char *path, int len)
{
if (len < 0) {
reply_with_error ("length < 0");
return -1;
}
return do_fallocate64 (path, len);
}
int
do_fallocate64 (const char *path, int64_t len)
{
int fd;
CHROOT_IN;
fd = open (path, O_WRONLY | O_CREAT | O_TRUNC | O_NOCTTY, 0666);
CHROOT_OUT;
if (fd == -1) {
reply_with_perror ("open: %s", path);
return -1;
}
#ifdef HAVE_POSIX_FALLOCATE
int err = posix_fallocate (fd, 0, len);
if (err != 0) {
errno = err;
reply_with_perror ("%s", path);
close (fd);
return -1;
}
#else
ssize_t r;
char buf[BUFSIZ];
const size_t len_sz = (size_t) len;
size_t n;
memset (buf, 0, BUFSIZ);
n = 0;
while (n < len_sz) {
r = write (fd, buf, len_sz - n < BUFSIZ ? len_sz - n : BUFSIZ);
if (r == -1) {
reply_with_perror ("write: %s", path);
close (fd);
return -1;
}
n += r;
}
#endif
if (close (fd) == -1) {
reply_with_perror ("close: %s", path);
return -1;
}
return 0;
}
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