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/*
* btrfs-extent-same.c
*
* Copyright (C) 2013 SUSE. 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 version 2 as published by the Free Software Foundation.
*
* 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.
*
* Authors: Mark Fasheh <mfasheh@suse.de>
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stddef.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_IOC_FILE_EXTENT_SAME _IOWR(BTRFS_IOCTL_MAGIC, 54, \
struct btrfs_ioctl_same_args)
#define BTRFS_SAME_DATA_DIFFERS 1
/* For extent-same ioctl */
struct btrfs_ioctl_same_extent_info {
int64_t fd; /* in - destination file */
uint64_t logical_offset; /* in - start of extent in destination */
uint64_t bytes_deduped; /* out - total # of bytes we
* were able to dedupe from
* this file */
/* status of this dedupe operation:
* 0 if dedup succeeds
* < 0 for error
* == BTRFS_SAME_DATA_DIFFERS if data differs
*/
int32_t status; /* out - see above description */
uint32_t reserved;
};
struct btrfs_ioctl_same_args {
uint64_t logical_offset; /* in - start of extent in source */
uint64_t length; /* in - length of extent */
uint16_t dest_count; /* in - total elements in info array */
uint16_t reserved1; /* out - number of files that got deduped */
uint32_t reserved2;
struct btrfs_ioctl_same_extent_info info[0];
};
static void usage(const char *prog)
{
printf("Usage: %s len file1 loff1 file2 loff2\n", prog);
}
int main(int argc, char **argv)
{
int ret, src_fd, i, numfiles;
char *srcf, *destf;
struct btrfs_ioctl_same_args *same;
struct btrfs_ioctl_same_extent_info *info;
unsigned long long bytes = 0ULL;
if (argc < 6 || (argc % 2)) {
usage(argv[0]);
return 1;
}
numfiles = (argc / 2) - 2;
printf("Deduping %d total files\n", numfiles + 1);
same = calloc(1,
sizeof(struct btrfs_ioctl_same_args) +
sizeof(struct btrfs_ioctl_same_extent_info) * numfiles);
if (!same)
return -ENOMEM;
srcf = argv[2];
same->length = atoll(argv[1]);
same->logical_offset = atoll(argv[3]);
same->dest_count = numfiles;
ret = open(srcf, O_RDONLY);
if (ret < 0) {
ret = errno;
fprintf(stderr, "Could not open file %s: (%d) %s\n", srcf, ret,
strerror(ret));
return -ret;
}
src_fd = ret;
printf("(%llu, %llu): %s\n", (unsigned long long)same->logical_offset,
(unsigned long long)same->length, srcf);
for (i = 0; i < same->dest_count; i++) {
destf = argv[4 + (i * 2)];
ret = open(destf, O_WRONLY);
if (ret < 0) {
ret = errno;
fprintf(stderr, "Could not open file %s: (%d) %s\n",
destf, ret, strerror(ret));
return -ret;
}
same->info[i].fd = ret;
same->info[i].logical_offset = atoll(argv[5 + (i * 2)]);
printf("(%llu, %llu): %s\n",
(unsigned long long)same->info[i].logical_offset,
(unsigned long long)same->length, destf);
}
ret = ioctl(src_fd, BTRFS_IOC_FILE_EXTENT_SAME, same);
if (ret < 0) {
ret = errno;
fprintf(stderr, "btrfs_same returned error: (%d) %s\n", ret,
strerror(ret));
return -ret;
}
printf("%u files asked to be deduped\n", same->dest_count);
for (i = 0; i < same->dest_count; i++) {
info = &same->info[i];
printf("i: %d, status: %d, bytes_deduped: %llu\n", i,
info->status, (unsigned long long)info->bytes_deduped);
bytes += info->bytes_deduped;
}
printf("%llu total bytes deduped in this operation\n", bytes);
return ret;
}
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