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