From patchwork Sun Jul 11 16:10:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sidong Yang X-Patchwork-Id: 12369225 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CAF49C07E96 for ; Sun, 11 Jul 2021 16:10:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3F0F61164 for ; Sun, 11 Jul 2021 16:10:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232010AbhGKQNE (ORCPT ); Sun, 11 Jul 2021 12:13:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229688AbhGKQNE (ORCPT ); Sun, 11 Jul 2021 12:13:04 -0400 Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com [IPv6:2607:f8b0:4864:20::102b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 93434C0613DD for ; Sun, 11 Jul 2021 09:10:16 -0700 (PDT) Received: by mail-pj1-x102b.google.com with SMTP id x21-20020a17090aa395b029016e25313bfcso9010835pjp.2 for ; Sun, 11 Jul 2021 09:10:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=LUBGQy1hJIpFdKt7KRUn4nXzjC4+9tZoJ40Y1Yv3hmY=; b=hNvKGAPmB4L4bpInYDI+BaA0wPBolVM3jgwJCRbsbkuQQjgs2YOOMn0wwivk/NgclG PUuyYHimP7M9+wy+ofyCUYtXMb4zFtWwuJcxw6RDCtHrzj3LHsu155MRm/SpiT+gJ4Bf 9hMTxtg9vTwGMSQ8sse7cN78smRRVXkkTPeDWft2OMdrU31SOw5CdyUMPmrRzKNlrQFA 7lHjn1b9ntmtQWPEQdXvhAJH0ub7izk3AMc5oUzKfhn5ToKfyiEI5hhN4OiSDttgPcIM b6aqbSKt1xLBfixDeoSSg9mv95+ABH+vCnFKozMDpQp99ACDhYRoVIr247HriMdKnuaV 3hoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=LUBGQy1hJIpFdKt7KRUn4nXzjC4+9tZoJ40Y1Yv3hmY=; b=tEFh4vf3bsQSq2ZL0ghb+62MejxBMXOuum7EbPZ7BMPR2JyNsrch9rmaF/7e6NrwjH mXLFsieMtwEY5hwc0Qw5/jnr1QVzlfB8kRPPsV9vCxhELuUDRfIpz0FzMdbA7+aC2kl3 IKRv6B7bOMrnbfFGJ/YQ/kMFis9r1T9TMwL7o8vhbu4As+1bN4GtjYlgynTs2xMoo2l8 TvhMwm71Dy+Q7b41fIJsHvKSWfy6hy70h1v6wAlsDmcYkE5HaIMzgPlRlT3BrIrF/Fke l6PABPcn+Ii3IgojmRLbtANSfY0oom1vWzkUP8GZBVzybvH304wD+v0Mzo19y1pzzX7A elxw== X-Gm-Message-State: AOAM532WEhp+THDGcdQ+ycQusc2hqbHDusBiFBZ4n03x5Bw7QKfqP1PB WwuYCzgRw622HFSbPDucGrUuIni6ij3DEw== X-Google-Smtp-Source: ABdhPJzDJ05vcX9EragM1cFhUxne1X5Z4uStSbd1P0XKqPIJC9e0CumpfW2UC/Qw0tGVn7yfnR34kg== X-Received: by 2002:a17:90a:520e:: with SMTP id v14mr9601416pjh.163.1626019816016; Sun, 11 Jul 2021 09:10:16 -0700 (PDT) Received: from localhost.localdomain ([59.12.165.26]) by smtp.gmail.com with ESMTPSA id b10sm12508785pfi.122.2021.07.11.09.10.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jul 2021 09:10:15 -0700 (PDT) From: Sidong Yang To: linux-btrfs , Qu Wenruo Cc: Sidong Yang Subject: [PATCH v2] btrfs-progs: cmds: Add subcommand that dumps file extents Date: Sun, 11 Jul 2021 16:10:07 +0000 Message-Id: <20210711161007.68589-1-realwakka@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This patch adds an subcommand in inspect-internal. It dumps file extents of the file that user provided. It helps to show the internal information about file extents comprise the file. Signed-off-by: Sidong Yang --- v2: - Prints type and compression - Use the terms from file_extents_item like disk_bytenr not like physical" --- Makefile | 2 +- cmds/commands.h | 2 +- cmds/inspect-dump-file-extents.c | 165 +++++++++++++++++++++++++++++++ cmds/inspect.c | 1 + 4 files changed, 168 insertions(+), 2 deletions(-) create mode 100644 cmds/inspect-dump-file-extents.c diff --git a/Makefile b/Makefile index a1cc457b..911e16de 100644 --- a/Makefile +++ b/Makefile @@ -156,7 +156,7 @@ cmds_objects = cmds/subvolume.o cmds/filesystem.o cmds/device.o cmds/scrub.o \ cmds/restore.o cmds/rescue.o cmds/rescue-chunk-recover.o \ cmds/rescue-super-recover.o \ cmds/property.o cmds/filesystem-usage.o cmds/inspect-dump-tree.o \ - cmds/inspect-dump-super.o cmds/inspect-tree-stats.o cmds/filesystem-du.o \ + cmds/inspect-dump-super.o cmds/inspect-tree-stats.o cmds/inspect-dump-file-extents.o cmds/filesystem-du.o \ mkfs/common.o check/mode-common.o check/mode-lowmem.o libbtrfs_objects = common/send-stream.o common/send-utils.o kernel-lib/rbtree.o btrfs-list.o \ kernel-lib/radix-tree.o common/extent-cache.o kernel-shared/extent_io.o \ diff --git a/cmds/commands.h b/cmds/commands.h index 8fa85d6c..55de248e 100644 --- a/cmds/commands.h +++ b/cmds/commands.h @@ -154,5 +154,5 @@ DECLARE_COMMAND(select_super); DECLARE_COMMAND(dump_super); DECLARE_COMMAND(debug_tree); DECLARE_COMMAND(rescue); - +DECLARE_COMMAND(inspect_dump_file_extents); #endif diff --git a/cmds/inspect-dump-file-extents.c b/cmds/inspect-dump-file-extents.c new file mode 100644 index 00000000..8574a1d0 --- /dev/null +++ b/cmds/inspect-dump-file-extents.c @@ -0,0 +1,165 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 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. + * + * 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 021110-1307, USA. + */ + +#include +#include +#include + +#include + +#include "common/utils.h" +#include "cmds/commands.h" + +static const char * const cmd_inspect_dump_file_extents_usage[] = { + "btrfs inspect-internal dump-extent path", + "Dump file extent in a textual form", + NULL +}; + +static void compress_type_to_str(u8 compress_type, char *ret) +{ + switch (compress_type) { + case BTRFS_COMPRESS_NONE: + strcpy(ret, "none"); + break; + case BTRFS_COMPRESS_ZLIB: + strcpy(ret, "zlib"); + break; + case BTRFS_COMPRESS_LZO: + strcpy(ret, "lzo"); + break; + case BTRFS_COMPRESS_ZSTD: + strcpy(ret, "zstd"); + break; + default: + sprintf(ret, "UNKNOWN.%d", compress_type); + } +} + +static const char* file_extent_type_to_str(u8 type) +{ + switch (type) { + case BTRFS_FILE_EXTENT_INLINE: return "inline"; + case BTRFS_FILE_EXTENT_PREALLOC: return "prealloc"; + case BTRFS_FILE_EXTENT_REG: return "regular"; + default: return "unknown"; + } +} + +static int cmd_inspect_dump_file_extents(const struct cmd_struct *cmd, + int argc, char **argv) +{ + int fd; + struct stat statbuf; + struct btrfs_ioctl_ino_lookup_args lookup; + struct btrfs_ioctl_search_args args; + struct btrfs_ioctl_search_key *sk = &args.key; + struct btrfs_file_extent_item *extent_item; + struct btrfs_ioctl_search_header *header; + u64 pos; + u64 buf_off; + u64 len; + u64 begin; + u64 disk_bytenr; + u64 disk_num_bytes; + u64 offset; + int ret; + int i; + char compress_str[16]; + + fd = open(argv[optind], O_RDONLY); + if (fd < 0) { + error("cannot open %s: %m", argv[optind]); + ret = 1; + goto out; + } + + if (fstat(fd, &statbuf) < 0) { + error("failed to fstat %s: %m", argv[optind]); + ret = 1; + goto out; + } + + lookup.treeid = 0; + lookup.objectid = BTRFS_FIRST_FREE_OBJECTID; + + if (ioctl(fd, BTRFS_IOC_INO_LOOKUP, &lookup) < 0) { + error("failed to lookup inode %s: %m", argv[optind]); + ret = 1; + goto out; + } + + pos = 0; + + sk->tree_id = lookup.treeid; + sk->min_objectid = statbuf.st_ino; + sk->max_objectid = statbuf.st_ino; + + sk->max_offset = UINT64_MAX; + sk->min_transid = 0; + sk->max_transid = UINT64_MAX; + sk->min_type = sk->max_type = BTRFS_EXTENT_DATA_KEY; + sk->nr_items = 4096; + + while (statbuf.st_size > pos) { + sk->min_offset = pos; + if (ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args)) { + error("failed to search tree ioctl %s: %m", argv[optind]); + ret = 1; + goto out; + } + + buf_off = 0; + for(i=0; inr_items; ++i) { + header = (struct btrfs_ioctl_search_header *)(args.buf + buf_off); + + if (btrfs_search_header_type(header) == BTRFS_EXTENT_DATA_KEY) { + extent_item = (struct btrfs_file_extent_item *)(header + 1); + begin = btrfs_search_header_offset(header); + + printf("type = %s, begin = %llu, ", + file_extent_type_to_str(extent_item->type), begin); + switch (extent_item->type) { + case BTRFS_FILE_EXTENT_INLINE: + len = le64_to_cpu(extent_item->ram_bytes); + printf("end = %llu\n", begin + len); + break; + case BTRFS_FILE_EXTENT_REG: + case BTRFS_FILE_EXTENT_PREALLOC: + len = le64_to_cpu(extent_item->num_bytes); + disk_bytenr = le64_to_cpu(extent_item->disk_bytenr); + disk_num_bytes = le64_to_cpu(extent_item->disk_num_bytes); + offset = le64_to_cpu(extent_item->offset); + compress_type_to_str(extent_item->compression, compress_str); + printf("end = %llu, disk_bytenr = %llu, disk_num_bytes = %llu," + " offset = %llu, compression = %s\n", + begin + len, disk_bytenr, disk_num_bytes, offset, compress_str); + + break; + } + + } + buf_off += sizeof(*header) + btrfs_search_header_len(header); + pos += len; + } + + } + ret = 0; +out: + close(fd); + return ret; +} +DEFINE_SIMPLE_COMMAND(inspect_dump_file_extents, "dump-file-extents"); diff --git a/cmds/inspect.c b/cmds/inspect.c index 2ef5f4b6..dfb0e27b 100644 --- a/cmds/inspect.c +++ b/cmds/inspect.c @@ -696,6 +696,7 @@ static const struct cmd_group inspect_cmd_group = { &cmd_struct_inspect_dump_tree, &cmd_struct_inspect_dump_super, &cmd_struct_inspect_tree_stats, + &cmd_struct_inspect_dump_file_extents, NULL } };