From patchwork Sun May 7 04:01:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hou Tao X-Patchwork-Id: 13233667 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26100C7EE2A for ; Sun, 7 May 2023 03:30:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230110AbjEGDae (ORCPT ); Sat, 6 May 2023 23:30:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230148AbjEGDa0 (ORCPT ); Sat, 6 May 2023 23:30:26 -0400 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C4231816B; Sat, 6 May 2023 20:30:24 -0700 (PDT) Received: from mail02.huawei.com (unknown [172.30.67.143]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4QDVL32bfkz4f3wRT; Sun, 7 May 2023 11:30:19 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.124.27]) by APP4 (Coremail) with SMTP id gCh0CgAHcLNHG1dkjIawIw--.21328S8; Sun, 07 May 2023 11:30:20 +0800 (CST) From: Hou Tao To: bpf@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, Alexei Starovoitov , Yonghong Song , Andrii Nakryiko , Viacheslav Dubeyko , Amir Goldstein , houtao1@huawei.com Subject: [RFC PATCH bpf-next 4/4] selftests/bpf: Add test cases for bpf file-system iterator Date: Sun, 7 May 2023 12:01:07 +0800 Message-Id: <20230507040107.3755166-5-houtao@huaweicloud.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20230507040107.3755166-1-houtao@huaweicloud.com> References: <20230507040107.3755166-1-houtao@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: gCh0CgAHcLNHG1dkjIawIw--.21328S8 X-Coremail-Antispam: 1UD129KBjvJXoW3AF1rWF15Gr43Xw4xKw15Jwb_yoWDJr15pa yrX345Cr4fX3y7Wr4ktF43uryYva1UWa4xGrZ7WF1rAr4kZr929F1xKry2vFnxJrZ09a1I v3yaka48Jr18XFJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvEb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUAV Cq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0 rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267 AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E 14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7 xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Y z7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7 v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF 1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIx AIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI 42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWI evJa73UjIFyTuYvjxUFgAwUUUUU X-CM-SenderInfo: xkrx3t3r6k3tpzhluzxrxghudrp/ X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Hou Tao Add three test cases to demonstrate the basic functionalities of bpf file-system iterator: 1) dump_raw_inode. Use bpf_seq_printf_btf to dump the content of the passed inode and its super_block 2) dump_inode. Use bpf_filemap_{cachestat,find_present,get_order} to dump the details of the inode page cache. 3) dump_mnt. Dump the basic information of the passed mount. Signed-off-by: Hou Tao --- .../selftests/bpf/prog_tests/bpf_iter_fs.c | 184 ++++++++++++++++++ .../testing/selftests/bpf/progs/bpf_iter_fs.c | 122 ++++++++++++ 2 files changed, 306 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/bpf_iter_fs.c create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_fs.c diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter_fs.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter_fs.c new file mode 100644 index 000000000000..e26d736001b4 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter_fs.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include +#include "bpf_iter_fs.skel.h" + +static void test_bpf_iter_raw_inode(void) +{ + const char *fpath = "/tmp/raw_inode.test"; + DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts); + union bpf_iter_link_info linfo; + int ino_fd, iter_fd, err; + struct bpf_iter_fs *skel; + struct bpf_link *link; + char buf[8192]; + ssize_t nr; + + ino_fd = open(fpath, O_WRONLY | O_CREAT | O_TRUNC, 0644); + if (!ASSERT_GE(ino_fd, 0, "open file")) + return; + ftruncate(ino_fd, 4095); + + skel = bpf_iter_fs__open(); + if (!ASSERT_OK_PTR(skel, "open")) + goto close_ino; + + bpf_program__set_autoload(skel->progs.dump_raw_inode, true); + + err = bpf_iter_fs__load(skel); + if (!ASSERT_OK(err, "load")) + goto free_skel; + + memset(&linfo, 0, sizeof(linfo)); + linfo.fs.type = BPF_FS_ITER_INODE; + linfo.fs.fd = ino_fd; + opts.link_info = &linfo; + opts.link_info_len = sizeof(linfo); + link = bpf_program__attach_iter(skel->progs.dump_raw_inode, &opts); + if (!ASSERT_OK_PTR(link, "attach iter")) + goto free_skel; + + iter_fd = bpf_iter_create(bpf_link__fd(link)); + if (!ASSERT_GE(iter_fd, 0, "create iter")) + goto free_link; + + nr = read(iter_fd, buf, sizeof(buf)); + if (!ASSERT_GT(nr, 0, "read iter")) + goto close_iter; + + buf[nr - 1] = 0; + puts(buf); + +close_iter: + close(iter_fd); +free_link: + bpf_link__destroy(link); +free_skel: + bpf_iter_fs__destroy(skel); +close_ino: + close(ino_fd); +} + +static void test_bpf_iter_inode(void) +{ + const char *fpath = "/tmp/inode.test"; + DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts); + union bpf_iter_link_info linfo; + int ino_fd, iter_fd, err; + struct bpf_iter_fs *skel; + struct bpf_link *link; + char buf[8192]; + ssize_t nr; + + /* Close fd after reading iterator completes */ + ino_fd = open(fpath, O_WRONLY | O_CREAT | O_TRUNC, 0644); + if (!ASSERT_GE(ino_fd, 0, "open file")) + return; + pwrite(ino_fd, buf, sizeof(buf), 0); + pwrite(ino_fd, buf, sizeof(buf), sizeof(buf) * 2); + + skel = bpf_iter_fs__open(); + if (!ASSERT_OK_PTR(skel, "open")) + goto close_ino; + + bpf_program__set_autoload(skel->progs.dump_inode, true); + + err = bpf_iter_fs__load(skel); + if (!ASSERT_OK(err, "load")) + goto free_skel; + + memset(&linfo, 0, sizeof(linfo)); + linfo.fs.type = BPF_FS_ITER_INODE; + linfo.fs.fd = ino_fd; + opts.link_info = &linfo; + opts.link_info_len = sizeof(linfo); + link = bpf_program__attach_iter(skel->progs.dump_inode, &opts); + if (!ASSERT_OK_PTR(link, "attach iter")) + goto free_skel; + + iter_fd = bpf_iter_create(bpf_link__fd(link)); + if (!ASSERT_GE(iter_fd, 0, "create iter")) + goto free_link; + + nr = read(iter_fd, buf, sizeof(buf)); + if (!ASSERT_GT(nr, 0, "read iter")) + goto close_iter; + + buf[nr - 1] = 0; + puts(buf); + +close_iter: + close(iter_fd); +free_link: + bpf_link__destroy(link); +free_skel: + bpf_iter_fs__destroy(skel); +close_ino: + close(ino_fd); +} + +static void test_bpf_iter_mnt(void) +{ + const char *fpath = "/tmp/mnt.test"; + DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts); + union bpf_iter_link_info linfo; + int mnt_fd, iter_fd, err; + struct bpf_iter_fs *skel; + struct bpf_link *link; + char buf[8192]; + ssize_t nr; + + /* Close fd after reading iterator completes */ + mnt_fd = open(fpath, O_WRONLY | O_CREAT | O_TRUNC, 0644); + if (!ASSERT_GE(mnt_fd, 0, "open file")) + return; + + skel = bpf_iter_fs__open(); + if (!ASSERT_OK_PTR(skel, "open")) + goto close_ino; + + bpf_program__set_autoload(skel->progs.dump_mnt, true); + + err = bpf_iter_fs__load(skel); + if (!ASSERT_OK(err, "load")) + goto free_skel; + + memset(&linfo, 0, sizeof(linfo)); + linfo.fs.type = BPF_FS_ITER_MNT; + linfo.fs.fd = mnt_fd; + opts.link_info = &linfo; + opts.link_info_len = sizeof(linfo); + link = bpf_program__attach_iter(skel->progs.dump_mnt, &opts); + if (!ASSERT_OK_PTR(link, "attach iter")) + goto free_skel; + + iter_fd = bpf_iter_create(bpf_link__fd(link)); + if (!ASSERT_GE(iter_fd, 0, "create iter")) + goto free_link; + + nr = read(iter_fd, buf, sizeof(buf)); + if (!ASSERT_GT(nr, 0, "read iter")) + goto close_iter; + + buf[nr - 1] = 0; + puts(buf); + +close_iter: + close(iter_fd); +free_link: + bpf_link__destroy(link); +free_skel: + bpf_iter_fs__destroy(skel); +close_ino: + close(mnt_fd); +} + +void test_bpf_iter_fs(void) +{ + if (test__start_subtest("dump_raw_inode")) + test_bpf_iter_raw_inode(); + if (test__start_subtest("dump_inode")) + test_bpf_iter_inode(); + if (test__start_subtest("dump_mnt")) + test_bpf_iter_mnt(); +} diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_fs.c b/tools/testing/selftests/bpf/progs/bpf_iter_fs.c new file mode 100644 index 000000000000..e238446b6ddf --- /dev/null +++ b/tools/testing/selftests/bpf/progs/bpf_iter_fs.c @@ -0,0 +1,122 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include "bpf_iter.h" +#include +#include +#include + +char _license[] SEC("license") = "GPL"; + +struct dump_ctx { + struct seq_file *seq; + struct inode *inode; + unsigned long from; + unsigned long max; +}; + +void bpf_filemap_cachestat(struct inode *inode, unsigned long from, unsigned long last, + struct cachestat *cs) __ksym; +long bpf_filemap_find_present(struct inode *inode, unsigned long from, unsigned long last) __ksym; +long bpf_filemap_get_order(struct inode *inode, unsigned long index) __ksym; + +static u64 dump_page_order(unsigned int i, void *ctx) +{ + struct dump_ctx *dump = ctx; + unsigned long index; + unsigned int order; + + index = bpf_filemap_find_present(dump->inode, dump->from, dump->max); + if (index == -1UL) + return 1; + order = bpf_filemap_get_order(dump->inode, index); + + BPF_SEQ_PRINTF(dump->seq, " page offset %lu order %u\n", index, order); + dump->from = index + (1 << order); + return 0; +} + +SEC("?iter/fs_inode") +int dump_raw_inode(struct bpf_iter__fs_inode *ctx) +{ + struct seq_file *seq = ctx->meta->seq; + struct inode *inode = ctx->inode; + struct btf_ptr ptr; + + if (inode == NULL) + return 0; + + memset(&ptr, 0, sizeof(ptr)); + ptr.type_id = bpf_core_type_id_kernel(struct inode); + ptr.ptr = inode; + bpf_seq_printf_btf(seq, &ptr, sizeof(ptr), 0); + + memset(&ptr, 0, sizeof(ptr)); + ptr.type_id = bpf_core_type_id_kernel(struct super_block); + ptr.ptr = inode->i_sb; + bpf_seq_printf_btf(seq, &ptr, sizeof(ptr), 0); + + return 0; +} + +SEC("?iter/fs_inode") +int dump_inode(struct bpf_iter__fs_inode *ctx) +{ + struct seq_file *seq = ctx->meta->seq; + struct inode *inode = ctx->inode; + struct cachestat cs = {}; + struct super_block *sb; + struct dentry *dentry; + struct dump_ctx dump; + + if (inode == NULL) + return 0; + + sb = inode->i_sb; + BPF_SEQ_PRINTF(seq, "sb: bsize %lu s_op %ps s_type %ps name %s\n", + sb->s_blocksize, sb->s_op, sb->s_type, sb->s_type->name); + + BPF_SEQ_PRINTF(seq, "ino: inode nlink %d inum %lu size %llu", + inode->i_nlink, inode->i_ino, inode->i_size); + dentry = ctx->dentry; + if (dentry) + BPF_SEQ_PRINTF(seq, ", name %s\n", dentry->d_name.name); + else + BPF_SEQ_PRINTF(seq, "\n"); + + bpf_filemap_cachestat(inode, 0, ~0UL, &cs); + BPF_SEQ_PRINTF(seq, "cache: cached %llu dirty %llu wb %llu evicted %llu\n", + cs.nr_cache, cs.nr_dirty, cs.nr_writeback, cs.nr_evicted); + + dump.seq = seq; + dump.inode = inode; + dump.from = 0; + /* TODO: handle BPF_MAX_LOOPS */ + dump.max = ((unsigned long)inode->i_size + 4095) / 4096; + BPF_SEQ_PRINTF(seq, "orders:\n"); + bpf_loop(dump.max, dump_page_order, &dump, 0); + + return 0; +} + +SEC("?iter/fs_mnt") +int dump_mnt(struct bpf_iter__fs_mnt *ctx) +{ + struct seq_file *seq = ctx->meta->seq; + struct mount *mnt = ctx->mnt; + struct super_block *sb; + + if (mnt == NULL) + return 0; + + sb = mnt->mnt.mnt_sb; + BPF_SEQ_PRINTF(seq, "dev %u:%u ", + sb->s_dev >> 20, sb->s_dev & ((1 << 20) - 1)); + + BPF_SEQ_PRINTF(seq, "id %d parent_id %d mnt_flags 0x%x", + mnt->mnt_id, mnt->mnt_parent->mnt_id, mnt->mnt.mnt_flags); + if (mnt->mnt.mnt_flags & 0x1000) + BPF_SEQ_PRINTF(seq, " shared:%d", mnt->mnt_group_id); + BPF_SEQ_PRINTF(seq, "\n"); + + return 0; +}