From patchwork Thu Nov 21 15:37:16 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Mahoney X-Patchwork-Id: 3219391 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id DDF1EC045B for ; Thu, 21 Nov 2013 15:39:02 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1AD8320725 for ; Thu, 21 Nov 2013 15:38:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 31D4420629 for ; Thu, 21 Nov 2013 15:38:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754565Ab3KUPiq (ORCPT ); Thu, 21 Nov 2013 10:38:46 -0500 Received: from cantor2.suse.de ([195.135.220.15]:55120 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752189Ab3KUPip (ORCPT ); Thu, 21 Nov 2013 10:38:45 -0500 Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id B3B97A79B4; Thu, 21 Nov 2013 16:38:43 +0100 (CET) Message-ID: <528E28AC.9000306@suse.com> Date: Thu, 21 Nov 2013 10:37:16 -0500 From: Jeff Mahoney User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.1.1 MIME-Version: 1.0 To: linux-btrfs , Filipe David Borba Manana Cc: Josef Bacik Subject: [PATCH v2] btrfs: fix leaks during sysfs teardown X-Enigmail-Version: 1.6 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Filipe noticed that we were leaking the features attribute group after umount. His fix of just calling sysfs_remove_group() wasn't enough since that removes just the supported features and not the unsupported features. This patch changes the unknown feature handling to add them individually so we can skip the kmalloc and uses the same iteration to tear them down later. We also fix the error handling during mount so that we catch the failing creation of the per-super kobject, and handle proper teardown of a half-setup sysfs context. Tested properly with kmemleak enabled this time. Reported-by: Filipe David Borba Manana Signed-off-by: Jeff Mahoney Tested-by: Filipe David Borba Manana --- fs/btrfs/sysfs.c | 133 ++++++++++++++++++++++++++++++------------------------- 1 file changed, 73 insertions(+), 60 deletions(-) --- a/fs/btrfs/sysfs.c 2013-11-21 09:31:53.764350456 -0500 +++ b/fs/btrfs/sysfs.c 2013-11-21 10:29:48.199104683 -0500 @@ -417,28 +417,84 @@ static inline struct btrfs_fs_info *to_f return container_of(kobj, struct btrfs_fs_info, super_kobj); } -void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) +#define NUM_FEATURE_BITS 64 +static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; +static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; + +static u64 supported_feature_masks[3] = { + [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, + [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, + [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, +}; + +static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) +{ + int set; + + for (set = 0; set < FEAT_MAX; set++) { + int i; + struct attribute *attrs[2]; + struct attribute_group agroup = { + .name = "features", + .attrs = attrs, + }; + u64 features = get_features(fs_info, set); + features &= ~supported_feature_masks[set]; + + if (!features) + continue; + + attrs[1] = NULL; + for (i = 0; i < NUM_FEATURE_BITS; i++) { + struct btrfs_feature_attr *fa; + + if (!(features & (1ULL << i))) + continue; + + fa = &btrfs_feature_attrs[set][i]; + attrs[0] = &fa->kobj_attr.attr; + if (add) { + int ret; + ret = sysfs_merge_group(&fs_info->super_kobj, + &agroup); + if (ret) + return ret; + } else + sysfs_unmerge_group(&fs_info->super_kobj, + &agroup); + } + + } + return 0; +} + +static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) { - sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); - kobject_del(fs_info->device_dir_kobj); - kobject_put(fs_info->device_dir_kobj); - kobject_del(fs_info->space_info_kobj); - kobject_put(fs_info->space_info_kobj); kobject_del(&fs_info->super_kobj); kobject_put(&fs_info->super_kobj); wait_for_completion(&fs_info->kobj_unregister); } +void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) +{ + if (fs_info->space_info_kobj) { + sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); + kobject_del(fs_info->space_info_kobj); + kobject_put(fs_info->space_info_kobj); + } + kobject_del(fs_info->device_dir_kobj); + kobject_put(fs_info->device_dir_kobj); + addrm_unknown_feature_attrs(fs_info, false); + sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); + __btrfs_sysfs_remove_one(fs_info); +} + const char * const btrfs_feature_set_names[3] = { [FEAT_COMPAT] = "compat", [FEAT_COMPAT_RO] = "compat_ro", [FEAT_INCOMPAT] = "incompat", }; -#define NUM_FEATURE_BITS 64 -static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; -static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; - char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) { size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ @@ -508,53 +564,6 @@ static void init_feature_attrs(void) } } -static u64 supported_feature_masks[3] = { - [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, - [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, - [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, -}; - -static int add_unknown_feature_attrs(struct btrfs_fs_info *fs_info) -{ - int set; - - for (set = 0; set < FEAT_MAX; set++) { - int i, count, ret, index = 0; - struct attribute **attrs; - struct attribute_group agroup = { - .name = "features", - }; - u64 features = get_features(fs_info, set); - features &= ~supported_feature_masks[set]; - - count = hweight64(features); - - if (!count) - continue; - - attrs = kcalloc(count + 1, sizeof(void *), GFP_KERNEL); - - for (i = 0; i < NUM_FEATURE_BITS; i++) { - struct btrfs_feature_attr *fa; - - if (!(features & (1ULL << i))) - continue; - - fa = &btrfs_feature_attrs[set][i]; - attrs[index++] = &fa->kobj_attr.attr; - } - - attrs[index] = NULL; - agroup.attrs = attrs; - - ret = sysfs_merge_group(&fs_info->super_kobj, &agroup); - kfree(attrs); - if (ret) - return ret; - } - return 0; -} - static int add_device_membership(struct btrfs_fs_info *fs_info) { int error = 0; @@ -590,13 +599,17 @@ int btrfs_sysfs_add_one(struct btrfs_fs_ fs_info->super_kobj.kset = btrfs_kset; error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, "%pU", fs_info->fsid); + if (error) + return error; error = sysfs_create_group(&fs_info->super_kobj, &btrfs_feature_attr_group); - if (error) - goto failure; + if (error) { + __btrfs_sysfs_remove_one(fs_info); + return error; + } - error = add_unknown_feature_attrs(fs_info); + error = addrm_unknown_feature_attrs(fs_info, true); if (error) goto failure;