From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933422AbXJLWsF (ORCPT ); Fri, 12 Oct 2007 18:48:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932757AbXJLWVf (ORCPT ); Fri, 12 Oct 2007 18:21:35 -0400 Received: from cantor2.suse.de ([195.135.220.15]:49924 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932614AbXJLWVc (ORCPT ); Fri, 12 Oct 2007 18:21:32 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: "Eric W. Biederman" , Tejun Heo , Cornelia Huck , Greg Kroah-Hartman Subject: [PATCH 50/75] sysfs: Rewrite sysfs_move_dir in terms of sysfs dirents Date: Fri, 12 Oct 2007 15:16:54 -0700 Message-Id: <11922276763650-git-send-email-gregkh@suse.de> X-Mailer: git-send-email 1.5.3.4 In-Reply-To: <1192227671143-git-send-email-gregkh@suse.de> References: \<20071012221251.GB4559@kroah.com\> <11922274393667-git-send-email-gregkh@suse.de> <11922274441634-git-send-email-gregkh@suse.de> <11922274503271-git-send-email-gregkh@suse.de> <11922274543490-git-send-email-gregkh@suse.de> <11922274643370-git-send-email-gregkh@suse.de> <11922274682487-git-send-email-gregkh@suse.de> <11922274732211-git-send-email-gregkh@suse.de> <11922274772578-git-send-email-gregkh@suse.de> <1192227481691-git-send-email-gregkh@suse.de> <11922274853108-git-send-email-gregkh@suse.de> <11922274901810-git-send-email-gregkh@suse.de> <11922274941588-git-send-email-gregkh@suse.de> <11922274993462-git-send-email-gregkh@suse.de> <11922275031518-git-send-email-gregkh@suse.de> <11922275074080-git-send-email-gregkh@suse.de> <11922275121763-git-send-email-gregkh@suse.de> <11922275181138-git-send-email-gregkh@suse.de> <11922275221643-git-send-email-gregkh@suse.de> <1192227527856-git-send-email-gregkh@suse.de> <11922275312531-git-send-email-gregkh@suse.de> <11922275371856-git-send-email-gregkh@suse.de> <11922275413548-git-send-email-gregkh@suse.de> <11922275462233-git-send-email-gregkh@suse.de> <1192227551156-git-send-email-gregkh@suse.de> <11922275552558-git-send-email-gregkh@suse.de> <119222756066-git-send-email-gregkh@suse.de> <11922275642378-git-send-email-gregkh@suse.de> <11922275693989-git-send-email-gregkh@suse.de> <1192227574129-git-send-email-gregkh@suse.de> <11922275781508-git-send-email-gregkh@suse.de> <11922275843236-git-send-email-gregkh@suse.de> <1192227589276-git-send-email-gregkh@suse.de> <1192227593813-git-send-email-gregkh@suse.de> <1192227598106-git-send-email-gregkh@suse.de> <1192227603335-git-send-email-gregkh@suse.de> <1192227611369-git-send-email-gregkh@suse.de> <11922276163147-git-send-email-gregkh@suse.de> <11922276201219-git-send-email-gregkh@suse.de> <11922276254051-git-send-email-gregkh@suse.de> <11922276302338-git-send-email-gregkh@suse.de> <1192227634772-git-send-email-gregkh@suse.de> <11922276392200-git-send-email-gregkh@suse.de> <11922276433594-git-send-email-gregkh@suse.de> <11922276471365-git-send-email-gregkh@suse.de> <1192227653165-git-send-email-gregkh@suse.de> <11922276572176-git-send-email-gregkh@suse.de> <11922276622731-git-send-email-gregkh@suse.de> <11922276672660-git-send-email-gregkh@suse.de> <1192227671143-git-send-email-gregkh@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Eric W. Biederman This patch rewrites sysfs_move_dir to perform it's checks as much as possible on the underlying sysfs_dirents instead of the contents of the dcache, making sysfs_move_dir more like the rest of the sysfs directory modification code. Signed-off-by: Eric W. Biederman Signed-off-by: Tejun Heo Cc: Cornelia Huck Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/dir.c | 34 ++++++++++++++++++---------------- 1 files changed, 18 insertions(+), 16 deletions(-) diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 463c5e3..da4bb66 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -845,56 +845,58 @@ int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj) BUG_ON(!sd->s_parent); new_parent_sd = new_parent_kobj->sd ? new_parent_kobj->sd : &sysfs_root; + error = 0; + if (sd->s_parent == new_parent_sd) + goto out; /* nothing to move */ + /* get dentries */ old_dentry = sysfs_get_dentry(sd); if (IS_ERR(old_dentry)) { error = PTR_ERR(old_dentry); - goto out_dput; + goto out; } old_parent = old_dentry->d_parent; new_parent = sysfs_get_dentry(new_parent_sd); if (IS_ERR(new_parent)) { error = PTR_ERR(new_parent); - goto out_dput; + goto out; } - if (old_parent->d_inode == new_parent->d_inode) { - error = 0; - goto out_dput; /* nothing to move */ - } again: mutex_lock(&old_parent->d_inode->i_mutex); if (!mutex_trylock(&new_parent->d_inode->i_mutex)) { mutex_unlock(&old_parent->d_inode->i_mutex); goto again; } + mutex_lock(&sysfs_mutex); - new_dentry = lookup_one_len(kobject_name(kobj), new_parent, strlen(kobject_name(kobj))); - if (IS_ERR(new_dentry)) { - error = PTR_ERR(new_dentry); + error = -EEXIST; + if (sysfs_find_dirent(new_parent_sd, sd->s_name)) goto out_unlock; - } else - error = 0; + + error = -ENOMEM; + new_dentry = d_alloc_name(new_parent, sd->s_name); + if (!new_dentry) + goto out_unlock; + + error = 0; d_add(new_dentry, NULL); d_move(old_dentry, new_dentry); dput(new_dentry); /* Remove from old parent's list and insert into new parent's list. */ - mutex_lock(&sysfs_mutex); - sysfs_unlink_sibling(sd); sysfs_get(new_parent_sd); sysfs_put(sd->s_parent); sd->s_parent = new_parent_sd; sysfs_link_sibling(sd); - mutex_unlock(&sysfs_mutex); - out_unlock: + mutex_unlock(&sysfs_mutex); mutex_unlock(&new_parent->d_inode->i_mutex); mutex_unlock(&old_parent->d_inode->i_mutex); - out_dput: + out: dput(new_parent); dput(old_dentry); dput(new_dentry); -- 1.5.3.4