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/*
* Copyright (c) 2016 Netapp, Inc. All rights reserved.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <sys/syscall.h>
#include <sys/uio.h>
#include <xfs/xfs.h>
#include "command.h"
#include "input.h"
#include "init.h"
#include "io.h"
static cmdinfo_t copy_range_cmd;
static void
copy_range_help(void)
{
printf(_("\n\
Copies a range of bytes from a file into the open file, overwriting any data\n\
already there.\n\
\n\
Example:\n\
'copy_range -s 100 -d 200 -l 300 some_file' - copies 300 bytes from some_file\n\
at offset 100 into the open\n\
file at offset 200\n\
'copy_range some_file' - copies all bytes from some_file into the open file\n\
at position 0\n\
"));
}
static loff_t
copy_file_range(int fd, loff_t *src, loff_t *dst, size_t len)
{
loff_t ret;
do {
ret = syscall(__NR_copy_file_range, fd, src, file->fd, dst, len, 0);
if (ret == -1)
return errno;
len -= ret;
} while (len > 0);
return 0;
}
static off64_t
copy_src_filesize(int fd)
{
struct stat st;
if (fstat(fd, &st) < 0) {
perror("fstat");
return -1;
};
return st.st_size;
}
static int
copy_dst_truncate(void)
{
int ret = ftruncate(file->fd, 0);
if (ret < 0)
perror("ftruncate");
return ret;
}
static int
copy_range_f(int argc, char **argv)
{
loff_t src = 0;
loff_t dst = 0;
size_t len = 0;
char *sp;
int opt;
int ret;
int fd;
while ((opt = getopt(argc, argv, "s:d:l:")) != -1) {
switch (opt) {
case 's':
src = strtoull(optarg, &sp, 10);
if (!sp || sp == optarg) {
printf(_("invalid source offset -- %s\n"), sp);
return 0;
}
break;
case 'd':
dst = strtoull(optarg, &sp, 10);
if (!sp || sp == optarg) {
printf(_("invalid destination offset -- %s\n"), sp);
return 0;
}
break;
case 'l':
len = strtoull(optarg, &sp, 10);
if (!sp || sp == optarg) {
printf(_("invalid length -- %s\n"), sp);
return 0;
}
break;
}
}
if (optind != argc - 1)
return command_usage(©_range_cmd);
fd = openfile(argv[optind], NULL, IO_READONLY, 0);
if (fd < 0)
return 0;
if (src == 0 && dst == 0 && len == 0) {
len = copy_src_filesize(fd);
copy_dst_truncate();
}
ret = copy_file_range(fd, &src, &dst, len);
close(fd);
return ret;
}
void
copy_range_init(void)
{
copy_range_cmd.name = "copy_range";
copy_range_cmd.cfunc = copy_range_f;
copy_range_cmd.argmin = 1;
copy_range_cmd.argmax = 7;
copy_range_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
copy_range_cmd.args = _("[-s src_off] [-d dst_off] [-l len] src_file");
copy_range_cmd.oneline = _("Copy a range of data between two files");
copy_range_cmd.help = copy_range_help;
add_command(©_range_cmd);
}
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