diff options
Diffstat (limited to 'fs/sysfs/file.c')
| -rw-r--r-- | fs/sysfs/file.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 352f966a1174..da25aeb0e062 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -428,6 +428,41 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr) /** + * sysfs_chmod_file - update the modified mode value on an object attribute. + * @kobj: object we're acting for. + * @attr: attribute descriptor. + * @mode: file permissions. + * + */ +int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode) +{ + struct dentry *dir = kobj->dentry; + struct dentry *victim; + struct sysfs_dirent *sd; + umode_t umode = (mode & S_IALLUGO) | S_IFREG; + int res = -ENOENT; + + down(&dir->d_inode->i_sem); + victim = sysfs_get_dentry(dir, attr->name); + if (!IS_ERR(victim)) { + if (victim->d_inode && + (victim->d_parent->d_inode == dir->d_inode)) { + sd = victim->d_fsdata; + attr->mode = mode; + sd->s_mode = umode; + victim->d_inode->i_mode = umode; + dput(victim); + res = 0; + } + } + up(&dir->d_inode->i_sem); + + return res; +} +EXPORT_SYMBOL_GPL(sysfs_chmod_file); + + +/** * sysfs_remove_file - remove an object attribute. * @kobj: object we're acting for. * @attr: attribute descriptor. |