From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.0 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 20516C07E95 for ; Sat, 10 Jul 2021 14:41:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF53F61260 for ; Sat, 10 Jul 2021 14:41:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231843AbhGJOoJ (ORCPT ); Sat, 10 Jul 2021 10:44:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42154 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229633AbhGJOoJ (ORCPT ); Sat, 10 Jul 2021 10:44:09 -0400 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52AEDC0613DD for ; Sat, 10 Jul 2021 07:41:24 -0700 (PDT) Received: by mail-pf1-x42b.google.com with SMTP id j9so5935122pfc.5 for ; Sat, 10 Jul 2021 07:41:24 -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=jNjC1i+um7q0O2DwfD8V3j575O+DBdAx/zsw40NkfPw=; b=svEE6mrTAofsIU5TTOROmtMyoaW3Vlf6HVTv/GwYtQwH5hf6DH2iwjqud223FlfHDm yBqWuNJ21K+voF6LHitGXGX/o9W5gNLzB6ytUyp8CBk8lLJfRFLR9Y6w7iGQ2ZEwNzPu ZPc2Bi/4v3mgoN4vYzdTDIdENhY+HG0bMNXzWE0Q148RKTwmbYbFqGUtiVQ97GMUtrQU t50wKVn9u9vADTbNvWvpyjU4AV1cx8yABJx1qqjYwAdfJkHZuhxVSfR9TDKT10+MtjVr JXWwz26N33qbpKT5Q69QtGZmgLNNuXscLLRF4NhwnWaNm+ozXGKtAwN5MfO6LPETz4C7 yPbA== 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=jNjC1i+um7q0O2DwfD8V3j575O+DBdAx/zsw40NkfPw=; b=Sir3WQxqUVGS2FeGgU/HgyTMmblXh0HKZ3fMp4YR0jt2My7HUafrmGH6Yyk1qD6Kj2 VZTvpCe+r/L9DRl1daidi02i+HmQDIjngtkM1jU60homuqznpU8qQznpExoj6Y2L3K1W AH9zqcl1o3qtqqLLcolVn6X0pMO8rCgWb98pHHz4GyxYR8mPnOF5d4f8Zh4LIm1SWxyc TnsbJHV3UAmB5MWUn0uQNQtS4ZWeg0q+SBKwxMSqs9/0m6GcgBVi1IrKJzE9/uM9AM1R XUquIWgZQmGvh1QXfq965oLhHJAYVKtOJ3FOxA8t7VJm9/wplyg125Wxd66d4WSd8nm/ /bzg== X-Gm-Message-State: AOAM532ZMMBeL0kNHzUhHM3k6KNMnIDHWv7YFN1F4bBvuM9KV8wU1VXj 8Rb2h37iNK7UfTxQohtR9H6yCbMGKuZhBg== X-Google-Smtp-Source: ABdhPJzL51wOWAowOXG6PfdzNH9AzZOiK+ILWrljMGb8/UMMNrJe8JzB/oC8tMXU4/+K5FPv2WbBHA== X-Received: by 2002:a05:6a00:bd3:b029:329:3e4f:eadb with SMTP id x19-20020a056a000bd3b02903293e4feadbmr6703639pfu.44.1625928077010; Sat, 10 Jul 2021 07:41:17 -0700 (PDT) Received: from localhost.localdomain ([59.12.165.26]) by smtp.gmail.com with ESMTPSA id i6sm11664594pgg.50.2021.07.10.07.41.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jul 2021 07:41:16 -0700 (PDT) From: Sidong Yang To: linux-btrfs Cc: Sidong Yang Subject: [RFC] btrfs-progs: cmds: Add subcommand that dumps file extents Date: Sat, 10 Jul 2021 14:41:07 +0000 Message-Id: <20210710144107.65224-1-realwakka@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- Hi, I'm writing an patch that adds an subcommand that dumps file extents of the file. I don't have much idea about btrfs but I referenced btrfs wiki, dev-docs, and also Zygo's bee. It's just like draft. I have some questions below. The command works like below, # ./btrfs inspect-internal dump-file-extents /mnt/bb/TAGS begin = 0x0, end = 0x20000, physical = 0x4fdf5000, physical_len = 0xc000 begin = 0x20000, end = 0x40000, physical = 0x4fe01000, physical_len = 0xc000 begin = 0x40000, end = 0x47000, physical = 0x4fe0d000, physical_len = 0x3000 What format would be better? Is it better to just use the variable name as it is? like disk_bytenr not like physical_len? And what option do we need? like showing compression or file extent type? Any comments will be welcome. Thanks! --- Makefile | 2 +- cmds/commands.h | 2 +- cmds/inspect-dump-file-extents.c | 130 +++++++++++++++++++++++++++++++ cmds/inspect.c | 1 + 4 files changed, 133 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..99aec7d7 --- /dev/null +++ b/cmds/inspect-dump-file-extents.c @@ -0,0 +1,130 @@ +/* + * 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 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 physical; + u64 offset; + u64 physical_len; + int ret; + int i; + + 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("begin = 0x%llx, ", begin); + switch (extent_item->type) { + case BTRFS_FILE_EXTENT_INLINE: + len = le64_to_cpu(extent_item->ram_bytes); + printf("end = 0x%llx\n", begin + len); + break; + case BTRFS_FILE_EXTENT_REG: + case BTRFS_FILE_EXTENT_PREALLOC: + len = le64_to_cpu(extent_item->num_bytes); + physical = le64_to_cpu(extent_item->disk_bytenr); + physical_len = le64_to_cpu(extent_item->disk_num_bytes); + offset = le64_to_cpu(extent_item->offset); + printf("end = 0x%llx, physical = 0x%llx, physical_len = 0x%llx\n", + begin + len, physical, physical_len); + 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 } }; -- 2.25.1