Ok, let's try something else entirely, which restores the full revalidation
that BLKRRPART previously caused by accident:
diff --git a/block/ioctl.c b/block/ioctl.c
index d61d652078f41c..06b2ecdce593c6 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -81,20 +81,25 @@ static int compat_blkpg_ioctl(struct block_device *bdev,
}
#endif
-static int blkdev_reread_part(struct block_device *bdev)
+static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
{
- int ret;
+ struct block_device *tmp;
if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
- mutex_lock(&bdev->bd_mutex);
- ret = bdev_disk_changed(bdev, false);
- mutex_unlock(&bdev->bd_mutex);
-
- return ret;
+ /*
+ * Reopen the device to revalidate the driver state and force a
+ * partition rescan.
+ */
+ set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
+ tmp = blkdev_get_by_dev(bdev->bd_dev, mode, NULL);
+ if (IS_ERR(tmp))
+ return PTR_ERR(tmp);
+ blkdev_put(tmp, mode);
+ return 0;
}
static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
@@ -498,7 +503,7 @@ static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
return 0;
case BLKRRPART:
- return blkdev_reread_part(bdev);
+ return blkdev_reread_part(bdev, mode & ~FMODE_EXCL);
case BLKTRACESTART:
case BLKTRACESTOP:
case BLKTRACETEARDOWN:
