backported patch to generate "change" uevent for loop device

2400_generate-change-event-loop-driver.patch (text/plain), 1.40 KB, created by Mike Pagano on 2010-07-30 00:12:59 UTC

--- a/drivers/block/loop.c	2010-07-29 20:00:51.000000000 -0400
+++ b/drivers/block/loop.c	2010-07-29 20:04:43.000000000 -0400
@@ -835,6 +835,8 @@ static int loop_set_fd(struct loop_devic
 
 	set_capacity(lo->lo_disk, size);
 	bd_set_size(bdev, size << 9);
+    /* let user-space know about the new size */
+    kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
 
 	set_blocksize(bdev, lo_blocksize);
 
@@ -858,6 +860,7 @@ out_clr:
 	set_capacity(lo->lo_disk, 0);
 	invalidate_bdev(bdev);
 	bd_set_size(bdev, 0);
+    kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
 	mapping_set_gfp_mask(mapping, lo->old_gfp_mask);
 	lo->lo_state = Lo_unbound;
  out_putf:
@@ -944,8 +947,11 @@ static int loop_clr_fd(struct loop_devic
 	if (bdev)
 		invalidate_bdev(bdev);
 	set_capacity(lo->lo_disk, 0);
-	if (bdev)
+	if (bdev) {
 		bd_set_size(bdev, 0);
+        /* let user-space know about this change */
+        kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
+    }
 	mapping_set_gfp_mask(filp->f_mapping, gfp);
 	lo->lo_state = Lo_unbound;
 	/* This is safe: open() is still holding a reference. */
@@ -1189,6 +1195,8 @@ static int loop_set_capacity(struct loop
 	sz <<= 9;
 	mutex_lock(&bdev->bd_mutex);
 	bd_set_size(bdev, sz);
+    /* let user-space know about the new size */
+    kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
 	mutex_unlock(&bdev->bd_mutex);
 
  out: