diff options
Diffstat (limited to 'fs/sysfs/group.c')
| -rw-r--r-- | fs/sysfs/group.c | 92 |
1 files changed, 77 insertions, 15 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index 09a1a25cd145..5f92cd2f61c1 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -3,8 +3,10 @@ * * Copyright (c) 2003 Patrick Mochel * Copyright (c) 2003 Open Source Development Lab + * Copyright (c) 2013 Greg Kroah-Hartman + * Copyright (c) 2013 The Linux Foundation * - * This file is released undert the GPL v2. + * This file is released undert the GPL v2. * */ @@ -19,8 +21,8 @@ static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj, const struct attribute_group *grp) { - struct attribute *const* attr; - struct bin_attribute *const* bin_attr; + struct attribute *const *attr; + struct bin_attribute *const *bin_attr; if (grp->attrs) for (attr = grp->attrs; *attr; attr++) @@ -33,8 +35,8 @@ static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj, static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj, const struct attribute_group *grp, int update) { - struct attribute *const* attr; - struct bin_attribute *const* bin_attr; + struct attribute *const *attr; + struct bin_attribute *const *bin_attr; int error = 0, i; if (grp->attrs) { @@ -129,6 +131,41 @@ int sysfs_create_group(struct kobject *kobj, { return internal_create_group(kobj, 0, grp); } +EXPORT_SYMBOL_GPL(sysfs_create_group); + +/** + * sysfs_create_groups - given a directory kobject, create a bunch of attribute groups + * @kobj: The kobject to create the group on + * @groups: The attribute groups to create, NULL terminated + * + * This function creates a bunch of attribute groups. If an error occurs when + * creating a group, all previously created groups will be removed, unwinding + * everything back to the original state when this function was called. + * It will explicitly warn and error if any of the attribute files being + * created already exist. + * + * Returns 0 on success or error code from sysfs_create_group on error. + */ +int sysfs_create_groups(struct kobject *kobj, + const struct attribute_group **groups) +{ + int error = 0; + int i; + + if (!groups) + return 0; + + for (i = 0; groups[i]; i++) { + error = sysfs_create_group(kobj, groups[i]); + if (error) { + while (--i >= 0) + sysfs_remove_group(kobj, groups[i]); + break; + } + } + return error; +} +EXPORT_SYMBOL_GPL(sysfs_create_groups); /** * sysfs_update_group - given a directory kobject, update an attribute group @@ -152,11 +189,18 @@ int sysfs_update_group(struct kobject *kobj, { return internal_create_group(kobj, 1, grp); } +EXPORT_SYMBOL_GPL(sysfs_update_group); - - -void sysfs_remove_group(struct kobject * kobj, - const struct attribute_group * grp) +/** + * sysfs_remove_group: remove a group from a kobject + * @kobj: kobject to remove the group from + * @grp: group to remove + * + * This function removes a group of attributes from a kobject. The attributes + * previously have to have been created for this group, otherwise it will fail. + */ +void sysfs_remove_group(struct kobject *kobj, + const struct attribute_group *grp) { struct sysfs_dirent *dir_sd = kobj->sd; struct sysfs_dirent *sd; @@ -164,8 +208,9 @@ void sysfs_remove_group(struct kobject * kobj, if (grp->name) { sd = sysfs_get_dirent(dir_sd, NULL, grp->name); if (!sd) { - WARN(!sd, KERN_WARNING "sysfs group %p not found for " - "kobject '%s'\n", grp, kobject_name(kobj)); + WARN(!sd, KERN_WARNING + "sysfs group %p not found for kobject '%s'\n", + grp, kobject_name(kobj)); return; } } else @@ -177,6 +222,27 @@ void sysfs_remove_group(struct kobject * kobj, sysfs_put(sd); } +EXPORT_SYMBOL_GPL(sysfs_remove_group); + +/** + * sysfs_remove_groups - remove a list of groups + * + * @kobj: The kobject for the groups to be removed from + * @groups: NULL terminated list of groups to be removed + * + * If groups is not NULL, remove the specified groups from the kobject. + */ +void sysfs_remove_groups(struct kobject *kobj, + const struct attribute_group **groups) +{ + int i; + + if (!groups) + return; + for (i = 0; groups[i]; i++) + sysfs_remove_group(kobj, groups[i]); +} +EXPORT_SYMBOL_GPL(sysfs_remove_groups); /** * sysfs_merge_group - merge files into a pre-existing attribute group. @@ -273,7 +339,3 @@ void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name, } } EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group); - -EXPORT_SYMBOL_GPL(sysfs_create_group); -EXPORT_SYMBOL_GPL(sysfs_update_group); -EXPORT_SYMBOL_GPL(sysfs_remove_group); |