[PATCH 12/15] driver core: Implement tagged directory support for device classes.
From: Eric W. Biederman
Date: Thu Jul 03 2008 - 21:24:21 EST
This patch enables tagging on every class directory if struct class
has a tag_type.
In addition device_del and device_rename were modified to uses
sysfs_delete_link and sysfs_rename_link respectively to ensure
when these operations happen on devices whose classes have
tag_ops that they work properly.
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Benjamin Thery <benjamin.thery@xxxxxxxx>
---
drivers/base/class.c | 30 ++++++++++++++++++++++---
drivers/base/core.c | 56 +++++++++++++++++++++++++++++++++--------------
include/linux/device.h | 3 ++
3 files changed, 68 insertions(+), 21 deletions(-)
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 839d27c..cf4e03f 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -135,6 +135,17 @@ static void remove_class_attrs(struct class *cls)
}
}
+static int class_setup_tagging(struct class *cls)
+{
+ enum sysfs_tag_type type;
+
+ type = cls->tag_type;
+ if (type == SYSFS_TAG_TYPE_NONE)
+ return 0;
+
+ return sysfs_make_tagged_dir(&cls->p->class_subsys.kobj, type);
+}
+
int __class_register(struct class *cls, struct lock_class_key *key)
{
struct class_private *cp;
@@ -171,13 +182,24 @@ int __class_register(struct class *cls, struct lock_class_key *key)
cls->p = cp;
error = kset_register(&cp->class_subsys);
- if (error) {
- kfree(cp);
- return error;
- }
+ if (error)
+ goto out_free_cp;
+
+ error = class_setup_tagging(cls);
+ if (error)
+ goto out_unregister;
+
error = add_class_attrs(class_get(cls));
class_put(cls);
+ if (error)
+ goto out_unregister;
+out:
return error;
+out_unregister:
+ kset_unregister(&cp->class_subsys);
+out_free_cp:
+ kfree(cp);
+ goto out;
}
EXPORT_SYMBOL_GPL(__class_register);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 90621a4..b009d5b 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -124,9 +124,21 @@ static void device_release(struct kobject *kobj)
}
}
+static const void *device_sysfs_tag(struct kobject *kobj)
+{
+ struct device *dev = to_dev(kobj);
+ const void *tag = NULL;
+
+ if (dev->class && dev->class->tag_type)
+ tag = dev->class->sysfs_tag(dev);
+
+ return tag;
+}
+
static struct kobj_type device_ktype = {
.release = device_release,
.sysfs_ops = &dev_sysfs_ops,
+ .sysfs_tag = device_sysfs_tag,
};
@@ -619,6 +631,10 @@ static struct kobject *get_device_parent(struct device *dev,
kobject_put(k);
return NULL;
}
+ /* If we created a new class-directory setup tagging */
+ if (dev->class->tag_type)
+ sysfs_make_tagged_dir(k, dev->class->tag_type);
+
/* do not emit an uevent for this simple "glue" directory */
return k;
}
@@ -709,7 +725,7 @@ out_device:
out_busid:
if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
device_is_not_partition(dev))
- sysfs_remove_link(&dev->class->p->class_subsys.kobj,
+ sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj,
dev->bus_id);
#else
/* link in the class directory pointing to the device */
@@ -727,7 +743,7 @@ out_busid:
return 0;
out_busid:
- sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id);
+ sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev->bus_id);
#endif
out_subsys:
@@ -755,13 +771,13 @@ static void device_remove_class_symlinks(struct device *dev)
if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
device_is_not_partition(dev))
- sysfs_remove_link(&dev->class->p->class_subsys.kobj,
+ sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj,
dev->bus_id);
#else
if (dev->parent && device_is_not_partition(dev))
sysfs_remove_link(&dev->kobj, "device");
- sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id);
+ sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev->bus_id);
#endif
sysfs_remove_link(&dev->kobj, "subsystem");
@@ -1344,6 +1360,16 @@ int device_rename(struct device *dev, char *new_name)
strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE);
strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
+#ifndef CONFIG_SYSFS_DEPRECATED
+ if (dev->class &&
+ (dev->kobj.parent != &dev->class->p->class_subsys.kobj)) {
+ error = sysfs_rename_link(&dev->class->p->class_subsys.kobj,
+ &dev->kobj, old_device_name, new_name);
+ if (error)
+ goto out;
+ }
+#endif
+
error = kobject_rename(&dev->kobj, new_name);
if (error) {
strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE);
@@ -1352,23 +1378,19 @@ int device_rename(struct device *dev, char *new_name)
#ifdef CONFIG_SYSFS_DEPRECATED
if (old_class_name) {
+ error = -ENOMEM;
new_class_name = make_class_name(dev->class->name, &dev->kobj);
- if (new_class_name) {
- error = sysfs_create_link(&dev->parent->kobj,
- &dev->kobj, new_class_name);
- if (error)
- goto out;
- sysfs_remove_link(&dev->parent->kobj, old_class_name);
- }
+ if (new_class_name)
+ error = sysfs_rename_link(&dev->parent->kobj,
+ &dev->kobj,
+ old_class_name,
+ new_class_name);
}
#else
if (dev->class) {
- error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
- &dev->kobj, dev->bus_id);
- if (error)
- goto out;
- sysfs_remove_link(&dev->class->p->class_subsys.kobj,
- old_device_name);
+ error = sysfs_rename_link(&dev->class->p->class_subsys.kobj,
+ &dev->kobj, old_device_name,
+ dev->bus_id);
}
#endif
diff --git a/include/linux/device.h b/include/linux/device.h
index d9886a6..8e84539 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -191,6 +191,9 @@ struct class {
int (*suspend)(struct device *dev, pm_message_t state);
int (*resume)(struct device *dev);
+ enum sysfs_tag_type tag_type;
+ const void *(*sysfs_tag)(struct device *dev);
+
struct class_private *p;
};
--
1.5.3.rc6.17.g1911
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/