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sysfs: Add sysfs_merge_group() and sysfs_unmerge_group() 

This patch (as1420) adds sysfs_merge_group() and sysfs_unmerge_group()
functions, allowing drivers easily to add and remove sets of
attributes to a pre-existing attribute group directory.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Alan Stern 2010-09-25 23:34:22 +02:00 committed by Rafael J. Wysocki
parent 098dff738a
commit 69d44ffbd7
2 changed files with 74 additions and 0 deletions
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59
fs/sysfs/group.c
View File

@ -148,6 +148,65 @@ void sysfs_remove_group(struct kobject * kobj,
sysfs_put(sd);
}
/**
* sysfs_merge_group - merge files into a pre-existing attribute group.
* @kobj: The kobject containing the group.
* @grp: The files to create and the attribute group they belong to.
*
* This function returns an error if the group doesn't exist or any of the
* files already exist in that group, in which case none of the new files
* are created.
*/
int sysfs_merge_group(struct kobject *kobj,
const struct attribute_group *grp)
{
struct sysfs_dirent *dir_sd;
int error = 0;
struct attribute *const *attr;
int i;
if (grp)
dir_sd = sysfs_get_dirent(kobj->sd, NULL, grp->name);
else
dir_sd = sysfs_get(kobj->sd);
if (!dir_sd)
return -ENOENT;
for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr))
error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
if (error) {
while (--i >= 0)
sysfs_hash_and_remove(dir_sd, NULL, (*--attr)->name);
}
sysfs_put(dir_sd);
return error;
}
EXPORT_SYMBOL_GPL(sysfs_merge_group);
/**
* sysfs_unmerge_group - remove files from a pre-existing attribute group.
* @kobj: The kobject containing the group.
* @grp: The files to remove and the attribute group they belong to.
*/
void sysfs_unmerge_group(struct kobject *kobj,
const struct attribute_group *grp)
{
struct sysfs_dirent *dir_sd;
struct attribute *const *attr;
if (grp)
dir_sd = sysfs_get_dirent(kobj->sd, NULL, grp->name);
else
dir_sd = sysfs_get(kobj->sd);
if (dir_sd) {
for (attr = grp->attrs; *attr; ++attr)
sysfs_hash_and_remove(dir_sd, NULL, (*attr)->name);
sysfs_put(dir_sd);
}
}
EXPORT_SYMBOL_GPL(sysfs_unmerge_group);
EXPORT_SYMBOL_GPL(sysfs_create_group);
EXPORT_SYMBOL_GPL(sysfs_update_group);

15
include/linux/sysfs.h
View File

@ -164,6 +164,10 @@ int sysfs_add_file_to_group(struct kobject *kobj,
const struct attribute *attr, const char *group);
void sysfs_remove_file_from_group(struct kobject *kobj,
const struct attribute *attr, const char *group);
int sysfs_merge_group(struct kobject *kobj,
const struct attribute_group *grp);
void sysfs_unmerge_group(struct kobject *kobj,
const struct attribute_group *grp);
void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
void sysfs_notify_dirent(struct sysfs_dirent *sd);
@ -302,6 +306,17 @@ static inline void sysfs_remove_file_from_group(struct kobject *kobj,
{
}
static inline int sysfs_merge_group(struct kobject *kobj,
const struct attribute_group *grp)
{
return 0;
}
static inline void sysfs_unmerge_group(struct kobject *kobj,
const struct attribute_group *grp)
{
}
static inline void sysfs_notify(struct kobject *kobj, const char *dir,
const char *attr)
{