Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/err.h> |
| 15 | #include "sysfs.h" |
| 16 | |
| 17 | |
| 18 | static void remove_files(struct dentry * dir, |
| 19 | const struct attribute_group * grp) |
| 20 | { |
| 21 | struct attribute *const* attr; |
| 22 | |
| 23 | for (attr = grp->attrs; *attr; attr++) |
| 24 | sysfs_hash_and_remove(dir,(*attr)->name); |
| 25 | } |
| 26 | |
| 27 | static int create_files(struct dentry * dir, |
| 28 | const struct attribute_group * grp) |
| 29 | { |
| 30 | struct attribute *const* attr; |
| 31 | int error = 0; |
| 32 | |
| 33 | for (attr = grp->attrs; *attr && !error; attr++) { |
| 34 | error = sysfs_add_file(dir, *attr, SYSFS_KOBJ_ATTR); |
| 35 | } |
| 36 | if (error) |
| 37 | remove_files(dir,grp); |
| 38 | return error; |
| 39 | } |
| 40 | |
| 41 | |
| 42 | int sysfs_create_group(struct kobject * kobj, |
| 43 | const struct attribute_group * grp) |
| 44 | { |
| 45 | struct dentry * dir; |
| 46 | int error; |
| 47 | |
| 48 | BUG_ON(!kobj || !kobj->dentry); |
| 49 | |
| 50 | if (grp->name) { |
| 51 | error = sysfs_create_subdir(kobj,grp->name,&dir); |
| 52 | if (error) |
| 53 | return error; |
| 54 | } else |
| 55 | dir = kobj->dentry; |
| 56 | dir = dget(dir); |
| 57 | if ((error = create_files(dir,grp))) { |
| 58 | if (grp->name) |
| 59 | sysfs_remove_subdir(dir); |
| 60 | } |
| 61 | dput(dir); |
| 62 | return error; |
| 63 | } |
| 64 | |
| 65 | void sysfs_remove_group(struct kobject * kobj, |
| 66 | const struct attribute_group * grp) |
| 67 | { |
| 68 | struct dentry * dir; |
| 69 | |
| 70 | if (grp->name) |
| 71 | dir = sysfs_get_dentry(kobj->dentry,grp->name); |
| 72 | else |
| 73 | dir = dget(kobj->dentry); |
| 74 | |
| 75 | remove_files(dir,grp); |
| 76 | if (grp->name) |
| 77 | sysfs_remove_subdir(dir); |
| 78 | /* release the ref. taken in this routine */ |
| 79 | dput(dir); |
| 80 | } |
| 81 | |
| 82 | |
| 83 | EXPORT_SYMBOL_GPL(sysfs_create_group); |
| 84 | EXPORT_SYMBOL_GPL(sysfs_remove_group); |