fs/sysfs/group.c

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