1 /* 2 * fs/sysfs/group.c - Operations for adding/removing multiple files at once. 3 * 4 * Copyright (c) 2003 Patrick Mochel 5 * Copyright (c) 2003 Open Source Development Lab 6 * 7 * This file is released undert the GPL v2. 8 * 9 */ 10 11 #include <linux/kobject.h> 12 #include <linux/module.h> 13 #include <linux/dcache.h> 14 #include <linux/namei.h> 15 #include <linux/err.h> 16 #include <linux/fs.h> 17 #include <asm/semaphore.h> 18 #include "sysfs.h" 19 20 21 static void remove_files(struct dentry * dir, 22 const struct attribute_group * grp) 23 { 24 struct attribute *const* attr; 25 26 for (attr = grp->attrs; *attr; attr++) 27 sysfs_hash_and_remove(dir,(*attr)->name); 28 } 29 30 static int create_files(struct dentry * dir, 31 const struct attribute_group * grp) 32 { 33 struct attribute *const* attr; 34 int error = 0; 35 36 for (attr = grp->attrs; *attr && !error; attr++) { 37 error = sysfs_add_file(dir, *attr, SYSFS_KOBJ_ATTR); 38 } 39 if (error) 40 remove_files(dir,grp); 41 return error; 42 } 43 44 45 int sysfs_create_group(struct kobject * kobj, 46 const struct attribute_group * grp) 47 { 48 struct dentry * dir; 49 int error; 50 51 BUG_ON(!kobj || !kobj->dentry); 52 53 if (grp->name) { 54 error = sysfs_create_subdir(kobj,grp->name,&dir); 55 if (error) 56 return error; 57 } else 58 dir = kobj->dentry; 59 dir = dget(dir); 60 if ((error = create_files(dir,grp))) { 61 if (grp->name) 62 sysfs_remove_subdir(dir); 63 } 64 dput(dir); 65 return error; 66 } 67 68 void sysfs_remove_group(struct kobject * kobj, 69 const struct attribute_group * grp) 70 { 71 struct dentry * dir; 72 73 if (grp->name) { 74 dir = lookup_one_len_kern(grp->name, kobj->dentry, 75 strlen(grp->name)); 76 BUG_ON(IS_ERR(dir)); 77 } 78 else 79 dir = dget(kobj->dentry); 80 81 remove_files(dir,grp); 82 if (grp->name) 83 sysfs_remove_subdir(dir); 84 /* release the ref. taken in this routine */ 85 dput(dir); 86 } 87 88 89 EXPORT_SYMBOL_GPL(sysfs_create_group); 90 EXPORT_SYMBOL_GPL(sysfs_remove_group); 91