From patchwork Mon Mar 9 14:02:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 11427255 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 73D1714B7 for ; Mon, 9 Mar 2020 14:02:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C18D21D56 for ; Mon, 9 Mar 2020 14:02:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="G4yfvT4z" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727213AbgCIOC4 (ORCPT ); Mon, 9 Mar 2020 10:02:56 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:46078 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726858AbgCIOC4 (ORCPT ); Mon, 9 Mar 2020 10:02:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583762574; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZWNwv0kqxXu8MKNrXXsXkeiy6YToQwPQIxqZbinVxDs=; b=G4yfvT4z/0kOunxypPcn5aXEdBacXdPZqrAw9v/JIqhlMhDCdDX+qXVDXBJPMpdqASgvlL RDgBWdedk8l2JMCVRBimJIFukMS4ilAM/b2sD3MKCDX0WYOfOHRS/lhZdGnLrC/WQ4JflW i2AfWVO8qxDK7U1vGLwd7OFq6fpbIwE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-465-Mv0KAgR3PkOYMrJPzGdCLA-1; Mon, 09 Mar 2020 10:02:52 -0400 X-MC-Unique: Mv0KAgR3PkOYMrJPzGdCLA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 42A2F1088388; Mon, 9 Mar 2020 14:02:50 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-120-182.rdu2.redhat.com [10.10.120.182]) by smtp.corp.redhat.com (Postfix) with ESMTP id 16E4760C87; Mon, 9 Mar 2020 14:02:46 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 13/14] fsinfo: Example support for Ext4 [ver #18] From: David Howells To: torvalds@linux-foundation.org, viro@zeniv.linux.org.uk Cc: Theodore Ts'o , Andreas Dilger , linux-ext4@vger.kernel.org, dhowells@redhat.com, raven@themaw.net, mszeredi@redhat.com, christian@brauner.io, jannh@google.com, darrick.wong@oracle.com, kzak@redhat.com, jlayton@redhat.com, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 09 Mar 2020 14:02:46 +0000 Message-ID: <158376256623.344135.9686051802633431404.stgit@warthog.procyon.org.uk> In-Reply-To: <158376244589.344135.12925590041630631412.stgit@warthog.procyon.org.uk> References: <158376244589.344135.12925590041630631412.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Add the ability to list some Ext4 volume timestamps as an example. Is this useful for ext4? Is there anything else that could be useful? Signed-off-by: David Howells cc: "Theodore Ts'o" cc: Andreas Dilger cc: linux-ext4@vger.kernel.org --- fs/ext4/Makefile | 1 + fs/ext4/ext4.h | 6 ++++++ fs/ext4/fsinfo.c | 45 +++++++++++++++++++++++++++++++++++++++++++ fs/ext4/super.c | 3 +++ include/uapi/linux/fsinfo.h | 16 +++++++++++++++ samples/vfs/test-fsinfo.c | 35 +++++++++++++++++++++++++++++++++ 6 files changed, 106 insertions(+) create mode 100644 fs/ext4/fsinfo.c diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile index 4ccb3c9189d8..71d5b460c7c7 100644 --- a/fs/ext4/Makefile +++ b/fs/ext4/Makefile @@ -16,3 +16,4 @@ ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o ext4-inode-test-objs += inode-test.o obj-$(CONFIG_EXT4_KUNIT_TESTS) += ext4-inode-test.o ext4-$(CONFIG_FS_VERITY) += verity.o +ext4-$(CONFIG_FSINFO) += fsinfo.o diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 9a2ee2428ecc..461968a87cd6 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -42,6 +42,7 @@ #include #include +#include #include @@ -3166,6 +3167,11 @@ extern const struct inode_operations ext4_file_inode_operations; extern const struct file_operations ext4_file_operations; extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin); +/* fsinfo.c */ +#ifdef CONFIG_FSINFO +extern int ext4_fsinfo(struct path *path, struct fsinfo_context *ctx); +#endif + /* inline.c */ extern int ext4_get_max_inline_size(struct inode *inode); extern int ext4_find_inline_data_nolock(struct inode *inode); diff --git a/fs/ext4/fsinfo.c b/fs/ext4/fsinfo.c new file mode 100644 index 000000000000..785f82a74dc9 --- /dev/null +++ b/fs/ext4/fsinfo.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Filesystem information for ext4 + * + * Copyright (C) 2020 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include "ext4.h" + +static int ext4_fsinfo_get_volume_name(struct path *path, struct fsinfo_context *ctx) +{ + const struct ext4_sb_info *sbi = EXT4_SB(path->mnt->mnt_sb); + const struct ext4_super_block *es = sbi->s_es; + + memcpy(ctx->buffer, es->s_volume_name, sizeof(es->s_volume_name)); + return strlen(ctx->buffer); +} + +static int ext4_fsinfo_get_timestamps(struct path *path, struct fsinfo_context *ctx) +{ + const struct ext4_sb_info *sbi = EXT4_SB(path->mnt->mnt_sb); + const struct ext4_super_block *es = sbi->s_es; + struct fsinfo_ext4_timestamps *ts = ctx->buffer; + +#define Z(R,S) R = S | (((u64)S##_hi) << 32) + Z(ts->mkfs_time, es->s_mkfs_time); + Z(ts->mount_time, es->s_mtime); + Z(ts->write_time, es->s_wtime); + Z(ts->last_check_time, es->s_lastcheck); + Z(ts->first_error_time, es->s_first_error_time); + Z(ts->last_error_time, es->s_last_error_time); + return sizeof(*ts); +} + +static const struct fsinfo_attribute ext4_fsinfo_attributes[] = { + FSINFO_STRING (FSINFO_ATTR_VOLUME_NAME, ext4_fsinfo_get_volume_name), + FSINFO_VSTRUCT (FSINFO_ATTR_EXT4_TIMESTAMPS, ext4_fsinfo_get_timestamps), + {} +}; + +int ext4_fsinfo(struct path *path, struct fsinfo_context *ctx) +{ + return fsinfo_get_attribute(path, ctx, ext4_fsinfo_attributes); +} diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 8434217549b3..02b4df073c4b 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1477,6 +1477,9 @@ static const struct super_operations ext4_sops = { .freeze_fs = ext4_freeze, .unfreeze_fs = ext4_unfreeze, .statfs = ext4_statfs, +#ifdef CONFIG_FSINFO + .fsinfo = ext4_fsinfo, +#endif .remount_fs = ext4_remount, .show_options = ext4_show_options, #ifdef CONFIG_QUOTA diff --git a/include/uapi/linux/fsinfo.h b/include/uapi/linux/fsinfo.h index 154c13a55819..d8d05f0f1473 100644 --- a/include/uapi/linux/fsinfo.h +++ b/include/uapi/linux/fsinfo.h @@ -41,6 +41,8 @@ #define FSINFO_ATTR_AFS_SERVER_NAME 0x301 /* Name of the Nth server (string) */ #define FSINFO_ATTR_AFS_SERVER_ADDRESSES 0x302 /* List of addresses of the Nth server */ +#define FSINFO_ATTR_EXT4_TIMESTAMPS 0x400 /* Ext4 superblock timestamps */ + /* * Optional fsinfo() parameter structure. * @@ -312,4 +314,18 @@ struct fsinfo_afs_server_address { #define FSINFO_ATTR_AFS_SERVER_ADDRESSES__STRUCT struct fsinfo_afs_server_address +/* + * Information struct for fsinfo(FSINFO_ATTR_EXT4_TIMESTAMPS). + */ +struct fsinfo_ext4_timestamps { + __u64 mkfs_time; + __u64 mount_time; + __u64 write_time; + __u64 last_check_time; + __u64 first_error_time; + __u64 last_error_time; +}; + +#define FSINFO_ATTR_EXT4_TIMESTAMPS__STRUCT struct fsinfo_ext4_timestamps + #endif /* _UAPI_LINUX_FSINFO_H */ diff --git a/samples/vfs/test-fsinfo.c b/samples/vfs/test-fsinfo.c index 82944f09e0c9..829297e9d1b6 100644 --- a/samples/vfs/test-fsinfo.c +++ b/samples/vfs/test-fsinfo.c @@ -374,6 +374,40 @@ static void dump_afs_fsinfo_server_address(void *reply, unsigned int size) printf("family=%u\n", ss->ss_family); } +static char *dump_ext4_time(char *buffer, time_t tim) +{ + struct tm tm; + int len; + + if (tim == 0) + return "-"; + + if (!localtime_r(&tim, &tm)) { + perror("localtime_r"); + exit(1); + } + len = strftime(buffer, 100, "%F %T", &tm); + if (len == 0) { + perror("strftime"); + exit(1); + } + return buffer; +} + +static void dump_ext4_fsinfo_timestamps(void *reply, unsigned int size) +{ + struct fsinfo_ext4_timestamps *r = reply; + char buffer[100]; + + printf("\n"); + printf("\tmkfs : %s\n", dump_ext4_time(buffer, r->mkfs_time)); + printf("\tmount : %s\n", dump_ext4_time(buffer, r->mount_time)); + printf("\twrite : %s\n", dump_ext4_time(buffer, r->write_time)); + printf("\tfsck : %s\n", dump_ext4_time(buffer, r->last_check_time)); + printf("\t1st-err : %s\n", dump_ext4_time(buffer, r->first_error_time)); + printf("\tlast-err: %s\n", dump_ext4_time(buffer, r->last_error_time)); +} + static void dump_string(void *reply, unsigned int size) { char *s = reply, *p; @@ -460,6 +494,7 @@ static const struct fsinfo_attribute fsinfo_attributes[] = { FSINFO_STRING (FSINFO_ATTR_AFS_CELL_NAME, string), FSINFO_STRING (FSINFO_ATTR_AFS_SERVER_NAME, string), FSINFO_LIST_N (FSINFO_ATTR_AFS_SERVER_ADDRESSES, afs_fsinfo_server_address), + FSINFO_VSTRUCT (FSINFO_ATTR_EXT4_TIMESTAMPS, ext4_fsinfo_timestamps), {} };