[PROGS] Import btrfs-extent-same

Message ID	51CB6D5B.70302@gmail.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-btrfs-owner@kernel.org> Message-ID: <51CB6D5B.70302@gmail.com> Date: Thu, 27 Jun 2013 00:38:19 +0200 From: Gabriel de Perthuis <g2p.code@gmail.com> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 MIME-Version: 1.0 To: Josef Bacik <jbacik@fusionio.com> CC: Mark Fasheh <mfasheh@suse.de>, "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org> Subject: [PROGS PATCH] Import btrfs-extent-same Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk

diff --git a/.gitignore b/.gitignore index a7e1b19..8f0ec54 100644 --- a/.gitignore +++ b/.gitignore @@ -5,10 +5,11 @@ version.h version man/*.gz btrfs btrfs.static btrfs-debug-tree +btrfs-extent-same btrfs-map-logical btrfs-fragments btrfsck calc-size ioctl-test diff --git a/Makefile b/Makefile index da7438e..35cc502 100644 --- a/Makefile +++ b/Makefile @@ -43,11 +43,11 @@ endif MAKEOPTS = --no-print-directory Q=$(Q) progs = mkfs.btrfs btrfs-debug-tree btrfsck \ btrfs btrfs-map-logical btrfs-image btrfs-zero-log btrfs-convert \ - btrfs-find-root btrfstune btrfs-show-super + btrfs-find-root btrfstune btrfs-show-super btrfs-extent-same # external libs required by various binaries; for btrfs-foo, # specify btrfs_foo_libs = <list of libs>; see $($(subst...)) rules below btrfs_convert_libs = -lext2fs -lcom_err btrfs_image_libs = -lpthread diff --git a/btrfs-extent-same.c b/btrfs-extent-same.c new file mode 100644 index 0000000..acf46b7 --- /dev/null +++ b/btrfs-extent-same.c @@ -0,0 +1,145 @@ +/* + * 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. + */ + +#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_RDONLY); + 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; +}

[PROGS] Import btrfs-extent-same

Commit Message

Comments

Patch