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 sysfs_dirent *dir_sd, 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_sd, (*attr)->name); 28 } 29 30 static int create_files(struct sysfs_dirent *dir_sd, 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_sd, *attr, SYSFS_KOBJ_ATTR); 38 if (error) 39 remove_files(dir_sd, grp); 40 return error; 41 } 42 43 44 int sysfs_create_group(struct kobject * kobj, 45 const struct attribute_group * grp) 46 { 47 struct sysfs_dirent *sd; 48 int error; 49 50 BUG_ON(!kobj || !kobj->sd); 51 52 if (grp->name) { 53 error = sysfs_create_subdir(kobj, grp->name, &sd); 54 if (error) 55 return error; 56 } else 57 sd = kobj->sd; 58 sysfs_get(sd); 59 error = create_files(sd, grp); 60 if (error) { 61 if (grp->name) 62 sysfs_remove_subdir(sd); 63 } 64 sysfs_put(sd); 65 return error; 66 } 67 68 void sysfs_remove_group(struct kobject * kobj, 69 const struct attribute_group * grp) 70 { 71 struct sysfs_dirent *dir_sd = kobj->sd; 72 struct sysfs_dirent *sd; 73 74 if (grp->name) { 75 sd = sysfs_get_dirent(dir_sd, grp->name); 76 BUG_ON(!sd); 77 } else 78 sd = sysfs_get(dir_sd); 79 80 remove_files(sd, grp); 81 if (grp->name) 82 sysfs_remove_subdir(sd); 83 84 sysfs_put(sd); 85 } 86 87 88 EXPORT_SYMBOL_GPL(sysfs_create_group); 89 EXPORT_SYMBOL_GPL(sysfs_remove_group); 90