3 files changed, 24 insertions, 18 deletions

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 9160159ef881..a3b86716f606 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -482,7 +482,7 @@ static struct mapped_device *dm_hash_rename(struct dm_ioctl *param,
 		dm_table_event(table);
 	dm_put_live_table(hc->md, srcu_idx);
 
-	if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr))
+	if (!dm_kobject_uevent(hc->md, KOBJ_CHANGE, param->event_nr, false))
 		param->flags |= DM_UEVENT_GENERATED_FLAG;
 
 	md = hc->md;
@@ -995,7 +995,7 @@ static int dev_remove(struct file *filp, struct dm_ioctl *param, size_t param_si
 
 	dm_ima_measure_on_device_remove(md, false);
 
-	if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr))
+	if (!dm_kobject_uevent(md, KOBJ_REMOVE, param->event_nr, false))
 		param->flags |= DM_UEVENT_GENERATED_FLAG;
 
 	dm_put(md);
@@ -1128,6 +1128,7 @@ static int do_resume(struct dm_ioctl *param)
 	struct hash_cell *hc;
 	struct mapped_device *md;
 	struct dm_table *new_map, *old_map = NULL;
+	bool need_resize_uevent = false;
 
 	down_write(&_hash_lock);
 
@@ -1148,6 +1149,8 @@ static int do_resume(struct dm_ioctl *param)
 
 	/* Do we need to load a new map ? */
 	if (new_map) {
+		sector_t old_size, new_size;
+
 		/* Suspend if it isn't already suspended */
 		if (param->flags & DM_SKIP_LOCKFS_FLAG)
 			suspend_flags &= ~DM_SUSPEND_LOCKFS_FLAG;
@@ -1156,6 +1159,7 @@ static int do_resume(struct dm_ioctl *param)
 		if (!dm_suspended_md(md))
 			dm_suspend(md, suspend_flags);
 
+		old_size = dm_get_size(md);
 		old_map = dm_swap_table(md, new_map);
 		if (IS_ERR(old_map)) {
 			dm_sync_table(md);
@@ -1163,6 +1167,9 @@ static int do_resume(struct dm_ioctl *param)
 			dm_put(md);
 			return PTR_ERR(old_map);
 		}
+		new_size = dm_get_size(md);
+		if (old_size && new_size && old_size != new_size)
+			need_resize_uevent = true;
 
 		if (dm_table_get_mode(new_map) & FMODE_WRITE)
 			set_disk_ro(dm_disk(md), 0);
@@ -1175,7 +1182,7 @@ static int do_resume(struct dm_ioctl *param)
 		if (!r) {
 			dm_ima_measure_on_device_resume(md, new_map ? true : false);
 
-			if (!dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr))
+			if (!dm_kobject_uevent(md, KOBJ_CHANGE, param->event_nr, need_resize_uevent))
 				param->flags |= DM_UEVENT_GENERATED_FLAG;
 		}
 	}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b424a6ee27ba..c391a618fb71 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2172,10 +2172,7 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
 	if (size != dm_get_size(md))
 		memset(&md->geometry, 0, sizeof(md->geometry));
 
-	if (!get_capacity(md->disk))
-		set_capacity(md->disk, size);
-	else
-		set_capacity_and_notify(md->disk, size);
+	set_capacity(md->disk, size);
 
 	dm_table_event_callback(t, event_callback, md);
 
@@ -2968,23 +2965,25 @@ EXPORT_SYMBOL_GPL(dm_internal_resume_fast);
  * Event notification.
  *---------------------------------------------------------------*/
 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
-		       unsigned cookie)
+		      unsigned cookie, bool need_resize_uevent)
 {
 	int r;
 	unsigned noio_flag;
 	char udev_cookie[DM_COOKIE_LENGTH];
-	char *envp[] = { udev_cookie, NULL };
-
-	noio_flag = memalloc_noio_save();
-
-	if (!cookie)
-		r = kobject_uevent(&disk_to_dev(md->disk)->kobj, action);
-	else {
+	char *envp[3] = { NULL, NULL, NULL };
+	char **envpp = envp;
+	if (cookie) {
 		snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u",
 			 DM_COOKIE_ENV_VAR_NAME, cookie);
-		r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj,
-				       action, envp);
+		*envpp++ = udev_cookie;
 	}
+	if (need_resize_uevent) {
+		*envpp++ = "RESIZE=1";
+	}
+
+	noio_flag = memalloc_noio_save();
+
+	r = kobject_uevent_env(&disk_to_dev(md->disk)->kobj, action, envp);
 
 	memalloc_noio_restore(noio_flag);
 
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 5201df03ce40..a9a3ffcad084 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -203,7 +203,7 @@ int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
 void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
 
 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
-		      unsigned cookie);
+		      unsigned cookie, bool need_resize_uevent);
 
 void dm_internal_suspend(struct mapped_device *md);
 void dm_internal_resume(struct mapped_device *md);