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 "sysfs.h" 17 18 19 static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj, 20 const struct attribute_group *grp) 21 { 22 struct attribute *const* attr; 23 int i; 24 25 for (i = 0, attr = grp->attrs; *attr; i++, attr++) 26 if (!grp->is_visible || 27 grp->is_visible(kobj, *attr, i)) 28 sysfs_hash_and_remove(dir_sd, (*attr)->name); 29 } 30 31 static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj, 32 const struct attribute_group *grp) 33 { 34 struct attribute *const* attr; 35 int error = 0, i; 36 37 for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++) 38 if (!grp->is_visible || 39 grp->is_visible(kobj, *attr, i)) 40 error |= 41 sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR); 42 if (error) 43 remove_files(dir_sd, kobj, grp); 44 return error; 45 } 46 47 48 int sysfs_create_group(struct kobject * kobj, 49 const struct attribute_group * grp) 50 { 51 struct sysfs_dirent *sd; 52 int error; 53 54 BUG_ON(!kobj || !kobj->sd); 55 56 if (grp->name) { 57 error = sysfs_create_subdir(kobj, grp->name, &sd); 58 if (error) 59 return error; 60 } else 61 sd = kobj->sd; 62 sysfs_get(sd); 63 error = create_files(sd, kobj, grp); 64 if (error) { 65 if (grp->name) 66 sysfs_remove_subdir(sd); 67 } 68 sysfs_put(sd); 69 return error; 70 } 71 72 void sysfs_remove_group(struct kobject * kobj, 73 const struct attribute_group * grp) 74 { 75 struct sysfs_dirent *dir_sd = kobj->sd; 76 struct sysfs_dirent *sd; 77 78 if (grp->name) { 79 sd = sysfs_get_dirent(dir_sd, grp->name); 80 BUG_ON(!sd); 81 } else 82 sd = sysfs_get(dir_sd); 83 84 remove_files(sd, kobj, grp); 85 if (grp->name) 86 sysfs_remove_subdir(sd); 87 88 sysfs_put(sd); 89 } 90 91 92 EXPORT_SYMBOL_GPL(sysfs_create_group); 93 EXPORT_SYMBOL_GPL(sysfs_remove_group); 94