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 <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);