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

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>

6 files changed, 110 insertions, 32 deletions

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 73d44cf53db0..3cf6eb36f3d8 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -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);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 31109193e2c4..ac4b5fdd95f5 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -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...
diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c
index d42840cc0d1d..486ce1fdeb8c 100644
--- a/drivers/block/genhd.c
+++ b/drivers/block/genhd.c
@@ -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,
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 77e178f13162..d95a110293fa 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -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,
diff --git a/include/linux/device.h b/include/linux/device.h
index a53a822c4d16..e86a580b72e1 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -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
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 01796c41c951..78af34840c69 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -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);
 };
 
 /*