Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261503AbUCCMiy (ORCPT ); Wed, 3 Mar 2004 07:38:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261602AbUCCMif (ORCPT ); Wed, 3 Mar 2004 07:38:35 -0500 Received: from e33.co.us.ibm.com ([32.97.110.131]:64705 "EHLO e33.co.us.ibm.com") by vger.kernel.org with ESMTP id S261503AbUCCMhG (ORCPT ); Wed, 3 Mar 2004 07:37:06 -0500 Date: Wed, 3 Mar 2004 18:11:43 +0530 From: Maneesh Soni To: LKML Cc: Al Viro , Greg KH , "Martin J. Bligh" , Matt Mackall , Christian Borntraeger , Andrew Morton , Dipankar Sarma Subject: [RFC] 5/6 sysfs backing store version 0.2 Message-ID: <20040303124143.GH2469@in.ibm.com> Reply-To: maneesh@in.ibm.com References: <20040303123858.GC2469@in.ibm.com> <20040303123942.GD2469@in.ibm.com> <20040303124005.GE2469@in.ibm.com> <20040303124035.GF2469@in.ibm.com> <20040303124109.GG2469@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040303124109.GG2469@in.ibm.com> User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3435 Lines: 121 => changes in version 0.2 o symlink name passed to sysfs_create_link() can be destroyed by the caller. So, the symlink name should be allocated and copied to the corresponding sysfs dirent instead of directly using the given name string. The allocated string is freed when the corresponding sysfs_dirent is freed through sysfs_put() ================= o sysfs_create_link() now does not create a dentry but allocates a sysfs_dirent and links it to the parent kobject. o sysfs_dirent corresponding to symlink has an array of two string. One of them is the name of the symlink and the second one is the target path of the symlink fs/sysfs/symlink.c | 48 ++++++++++++++++++++++++++++++++++++++---------- 1 files changed, 38 insertions(+), 10 deletions(-) diff -puN fs/sysfs/symlink.c~sysfs-leaves-symlink fs/sysfs/symlink.c --- linux-2.6.4-rc1/fs/sysfs/symlink.c~sysfs-leaves-symlink 2004-03-03 16:24:11.000000000 +0530 +++ linux-2.6.4-rc1-maneesh/fs/sysfs/symlink.c 2004-03-03 16:24:11.000000000 +0530 @@ -15,7 +15,7 @@ static int init_symlink(struct inode * i return 0; } -static int sysfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname) +int sysfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname) { int error; @@ -63,6 +63,27 @@ static void fill_object_path(struct kobj } } +static int sysfs_add_link(struct sysfs_dirent * parent_sd, char * name, char * target) +{ + struct sysfs_dirent * sd; + char ** link_names; + + link_names = kmalloc(sizeof(char *) * 2, GFP_KERNEL); + if (!link_names) + return -ENOMEM; + + link_names[0] = name; + link_names[1] = target; + + sd = sysfs_new_dirent(parent_sd, link_names, SYSFS_KOBJ_LINK); + if (!sd) { + kfree(link_names); + return -ENOMEM; + } + + return 0; +} + /** * sysfs_create_link - create symlink between two objects. * @kobj: object whose directory we're creating the link in. @@ -72,13 +93,15 @@ static void fill_object_path(struct kobj int sysfs_create_link(struct kobject * kobj, struct kobject * target, char * name) { struct dentry * dentry = kobj->dentry; - struct dentry * d; int error = 0; int size; int depth; - char * path; + char * link_name, * path; char * s; + if (!name) + return -EINVAL; + depth = object_depth(kobj); size = object_path_length(target) + depth * 3 - 1; if (size > PATH_MAX) @@ -96,15 +119,20 @@ int sysfs_create_link(struct kobject * k fill_object_path(target,path,size); pr_debug("%s: path = '%s'\n",__FUNCTION__,path); + link_name = kmalloc(strlen(name) + 1, GFP_KERNEL); + if (!link_name) { + kfree(path); + return -ENOMEM; + } + strcpy(link_name, name); + down(&dentry->d_inode->i_sem); - d = sysfs_get_dentry(dentry,name); - if (!IS_ERR(d)) - error = sysfs_symlink(dentry->d_inode,d,path); - else - error = PTR_ERR(d); - dput(d); + error = sysfs_add_link(dentry->d_fsdata, link_name, path); up(&dentry->d_inode->i_sem); - kfree(path); + if (error) { + kfree(path); + kfree(link_name); + } return error; } _ -- Maneesh Soni Linux Technology Center, IBM Software Lab, Bangalore, India email: maneesh@in.ibm.com Phone: 91-80-25044999 Fax: 91-80-5268553 T/L : 9243696 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/