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[PATCH] add sysfs attr to re-emit device hotplug event

Browse source 
A "coldplug + udevstart" can be simple like this:
  for i in /sys/block/*/*/uevent; do echo 1 > $i; done
  for i in /sys/class/*/*/uevent; do echo 1 > $i; done
  for i in /sys/bus/*/devices/*/uevent; do echo 1 > $i; done

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers 2005-10-01 14:49:43 +02:00 committed by Greg Kroah-Hartman
parent d8539d81ae
commit a7fd67062e
6 changed files with 110 additions and 32 deletions
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16
drivers/base/class.c
View file

@ -442,6 +442,13 @@ static ssize_t show_dev(struct class_device *class_dev, char *buf)
return print_dev_t(buf, class_dev->devt);
}
static ssize_t store_uevent(struct class_device *class_dev,
const char *buf, size_t count)
{
kobject_hotplug(&class_dev->kobj, KOBJ_ADD);
return count;
}
void class_device_initialize(struct class_device *class_dev)
{
kobj_set_kset_s(class_dev, class_obj_subsys);
@ -497,6 +504,12 @@ int class_device_add(struct class_device *class_dev)
goto register_done;
/* add the needed attributes to this device */
class_dev->uevent_attr.attr.name = "uevent";
class_dev->uevent_attr.attr.mode = S_IWUSR;
class_dev->uevent_attr.attr.owner = parent->owner;
class_dev->uevent_attr.store = store_uevent;
class_device_create_file(class_dev, &class_dev->uevent_attr);
if (MAJOR(class_dev->devt)) {
struct class_device_attribute *attr;
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
@ -505,12 +518,10 @@ int class_device_add(struct class_device *class_dev)
kobject_del(&class_dev->kobj);
goto register_done;
}
attr->attr.name = "dev";
attr->attr.mode = S_IRUGO;
attr->attr.owner = parent->owner;
attr->show = show_dev;
attr->store = NULL;
class_device_create_file(class_dev, attr);
class_dev->devt_attr = attr;
}
@ -621,6 +632,7 @@ void class_device_del(struct class_device *class_dev)
sysfs_remove_link(&class_dev->kobj, "device");
sysfs_remove_link(&class_dev->dev->kobj, class_name);
}
class_device_remove_file(class_dev, &class_dev->uevent_attr);
if (class_dev->devt_attr)
class_device_remove_file(class_dev, class_dev->devt_attr);
class_device_remove_attrs(class_dev);

16
drivers/base/core.c
View file

@ -154,6 +154,13 @@ static struct kset_hotplug_ops device_hotplug_ops = {
.hotplug = dev_hotplug,
};
static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
kobject_hotplug(&dev->kobj, KOBJ_ADD);
return count;
}
/**
* device_subsys - structure to be registered with kobject core.
*/
@ -259,6 +266,14 @@ int device_add(struct device *dev)
if ((error = kobject_add(&dev->kobj)))
goto Error;
dev->uevent_attr.attr.name = "uevent";
dev->uevent_attr.attr.mode = S_IWUSR;
if (dev->driver)
dev->uevent_attr.attr.owner = dev->driver->owner;
dev->uevent_attr.store = store_uevent;
device_create_file(dev, &dev->uevent_attr);
kobject_hotplug(&dev->kobj, KOBJ_ADD);
if ((error = device_pm_add(dev)))
goto PMError;
@ -350,6 +365,7 @@ void device_del(struct device * dev)
if (parent)
klist_del(&dev->knode_parent);
device_remove_file(dev, &dev->uevent_attr);
/* Notify the platform of the removal, in case they
* need to do anything...

25
drivers/block/genhd.c
View file

@ -337,10 +337,30 @@ static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr,
return ret;
}
static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr,
const char *page, size_t count)
{
struct gendisk *disk = to_disk(kobj);
struct disk_attribute *disk_attr =
container_of(attr,struct disk_attribute,attr);
ssize_t ret = 0;
if (disk_attr->store)
ret = disk_attr->store(disk, page, count);
return ret;
}
static struct sysfs_ops disk_sysfs_ops = {
.show = &disk_attr_show,
.store = &disk_attr_store,
};
static ssize_t disk_uevent_store(struct gendisk * disk,
const char *buf, size_t count)
{
kobject_hotplug(&disk->kobj, KOBJ_ADD);
return count;
}
static ssize_t disk_dev_read(struct gendisk * disk, char *page)
{
dev_t base = MKDEV(disk->major, disk->first_minor);
@ -382,6 +402,10 @@ static ssize_t disk_stats_read(struct gendisk * disk, char *page)
jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
}
static struct disk_attribute disk_attr_uevent = {
.attr = {.name = "uevent", .mode = S_IWUSR },
.store = disk_uevent_store
};
static struct disk_attribute disk_attr_dev = {
.attr = {.name = "dev", .mode = S_IRUGO },
.show = disk_dev_read
@ -404,6 +428,7 @@ static struct disk_attribute disk_attr_stat = {
};
static struct attribute * default_attrs[] = {
&disk_attr_uevent.attr,
&disk_attr_dev.attr,
&disk_attr_range.attr,
&disk_attr_removable.attr,

27
fs/partitions/check.c
View file

@ -192,6 +192,7 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
struct part_attribute {
struct attribute attr;
ssize_t (*show)(struct hd_struct *,char *);
ssize_t (*store)(struct hd_struct *,const char *, size_t);
};
static ssize_t
@ -201,14 +202,33 @@ part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
ssize_t ret = 0;
if (part_attr->show)
ret = part_attr->show(p,page);
ret = part_attr->show(p, page);
return ret;
}
static ssize_t
part_attr_store(struct kobject * kobj, struct attribute * attr,
const char *page, size_t count)
{
struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
ssize_t ret = 0;
if (part_attr->store)
ret = part_attr->store(p, page, count);
return ret;
}
static struct sysfs_ops part_sysfs_ops = {
.show = part_attr_show,
.store = part_attr_store,
};
static ssize_t part_uevent_store(struct hd_struct * p,
const char *page, size_t count)
{
kobject_hotplug(&p->kobj, KOBJ_ADD);
return count;
}
static ssize_t part_dev_read(struct hd_struct * p, char *page)
{
struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
@ -229,6 +249,10 @@ static ssize_t part_stat_read(struct hd_struct * p, char *page)
p->reads, (unsigned long long)p->read_sectors,
p->writes, (unsigned long long)p->write_sectors);
}
static struct part_attribute part_attr_uevent = {
.attr = {.name = "uevent", .mode = S_IWUSR },
.store = part_uevent_store
};
static struct part_attribute part_attr_dev = {
.attr = {.name = "dev", .mode = S_IRUGO },
.show = part_dev_read
@ -247,6 +271,7 @@ static struct part_attribute part_attr_stat = {
};
static struct attribute * default_attrs[] = {
&part_attr_uevent.attr,
&part_attr_dev.attr,
&part_attr_start.attr,
&part_attr_size.attr,

57
include/linux/device.h
View file

@ -190,6 +190,18 @@ struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
extern int class_create_file(struct class *, const struct class_attribute *);
extern void class_remove_file(struct class *, const struct class_attribute *);
struct class_device_attribute {
struct attribute attr;
ssize_t (*show)(struct class_device *, char * buf);
ssize_t (*store)(struct class_device *, const char * buf, size_t count);
};
#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
struct class_device_attribute class_device_attr_##_name = \
__ATTR(_name,_mode,_show,_store)
extern int class_device_create_file(struct class_device *,
const struct class_device_attribute *);
struct class_device {
struct list_head node;
@ -198,6 +210,7 @@ struct class_device {
struct class * class; /* required */
dev_t devt; /* dev_t, creates the sysfs "dev" */
struct class_device_attribute *devt_attr;
struct class_device_attribute uevent_attr;
struct device * dev; /* not necessary, but nice to have */
void * class_data; /* class-specific data */
@ -228,18 +241,6 @@ extern int class_device_rename(struct class_device *, char *);
extern struct class_device * class_device_get(struct class_device *);
extern void class_device_put(struct class_device *);
struct class_device_attribute {
struct attribute attr;
ssize_t (*show)(struct class_device *, char * buf);
ssize_t (*store)(struct class_device *, const char * buf, size_t count);
};
#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
struct class_device_attribute class_device_attr_##_name = \
__ATTR(_name,_mode,_show,_store)
extern int class_device_create_file(struct class_device *,
const struct class_device_attribute *);
extern void class_device_remove_file(struct class_device *,
const struct class_device_attribute *);
extern int class_device_create_bin_file(struct class_device *,
@ -266,6 +267,20 @@ extern struct class_device *class_device_create(struct class *cls, dev_t devt,
extern void class_device_destroy(struct class *cls, dev_t devt);
/* interface for exporting device attributes */
struct device_attribute {
struct attribute attr;
ssize_t (*show)(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t (*store)(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
};
#define DEVICE_ATTR(_name,_mode,_show,_store) \
struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
extern int device_create_file(struct device *device, struct device_attribute * entry);
extern void device_remove_file(struct device * dev, struct device_attribute * attr);
struct device {
struct klist klist_children;
struct klist_node knode_parent; /* node in sibling list */
@ -275,6 +290,7 @@ struct device {
struct kobject kobj;
char bus_id[BUS_ID_SIZE]; /* position on parent bus */
struct device_attribute uevent_attr;
struct semaphore sem; /* semaphore to synchronize calls to
* its driver.
@ -343,23 +359,6 @@ extern int device_attach(struct device * dev);
extern void driver_attach(struct device_driver * drv);
/* driverfs interface for exporting device attributes */
struct device_attribute {
struct attribute attr;
ssize_t (*show)(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t (*store)(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
};
#define DEVICE_ATTR(_name,_mode,_show,_store) \
struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
extern int device_create_file(struct device *device, struct device_attribute * entry);
extern void device_remove_file(struct device * dev, struct device_attribute * attr);
/*
* Platform "fixup" functions - allow the platform to have their say
* about devices and actions that the general device layer doesn't

1
include/linux/genhd.h
View file

@ -132,6 +132,7 @@ struct gendisk {
struct disk_attribute {
struct attribute attr;
ssize_t (*show)(struct gendisk *, char *);
ssize_t (*store)(struct gendisk *, const char *, size_t);
};
/*