From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754687Ab0CBXei (ORCPT ); Tue, 2 Mar 2010 18:34:38 -0500 Received: from kroah.org ([198.145.64.141]:38670 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754292Ab0CBX3k (ORCPT ); Tue, 2 Mar 2010 18:29:40 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: "Eric W. Biederman" , Tejun Heo , Greg Kroah-Hartman Subject: [PATCH 43/62] sysfs: Only take active references on attributes. Date: Tue, 2 Mar 2010 15:28:42 -0800 Message-Id: <1267572541-410-43-git-send-email-gregkh@suse.de> X-Mailer: git-send-email 1.7.0.1 In-Reply-To: <20100302230933.GA32287@kroah.com> References: <20100302230933.GA32287@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric W. Biederman If we exclude directories and symlinks from the set of sysfs dirents where we need active references we are left with sysfs attributes (binary or not). - Tweak sysfs_deactivate to only do something on attributes - Move lockdep initialization into sysfs_file_add_mode to limit it to just attributes. Signed-off-by: Eric W. Biederman Acked-by: WANG Cong Cc: Tejun Heo Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/dir.c | 5 ++++- fs/sysfs/file.c | 1 + fs/sysfs/sysfs.h | 1 + 3 files changed, 6 insertions(+), 1 deletions(-) diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 1bdc42f..481fdec 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -156,6 +156,10 @@ static void sysfs_deactivate(struct sysfs_dirent *sd) int v; BUG_ON(sd->s_sibling || !(sd->s_flags & SYSFS_FLAG_REMOVED)); + + if (!(sysfs_type(sd) & SYSFS_ACTIVE_REF)) + return; + sd->s_sibling = (void *)&wait; rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_); @@ -315,7 +319,6 @@ struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type) atomic_set(&sd->s_count, 1); atomic_set(&sd->s_active, 0); - sysfs_dirent_init_lockdep(sd); sd->s_name = name; sd->s_mode = mode; diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 4096136..e222b25 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -509,6 +509,7 @@ int sysfs_add_file_mode(struct sysfs_dirent *dir_sd, if (!sd) return -ENOMEM; sd->s_attr.attr = (void *)attr; + sysfs_dirent_init_lockdep(sd); sysfs_addrm_start(&acxt, dir_sd); rc = sysfs_add_one(&acxt, sd); diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h index bb7723c..7db6884 100644 --- a/fs/sysfs/sysfs.h +++ b/fs/sysfs/sysfs.h @@ -79,6 +79,7 @@ struct sysfs_dirent { #define SYSFS_KOBJ_BIN_ATTR 0x0004 #define SYSFS_KOBJ_LINK 0x0008 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) +#define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR) #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK #define SYSFS_FLAG_REMOVED 0x0200 -- 1.7.0.1