[PATCH V2 1/2] block: Set inode of block_device size to zero when delete gendisk.

[majianpeng]

When remove gendisk, set the size of inode of block_device to zero.
This is mainly let the vfs know disk removed.

Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
---
 block/genhd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/block/genhd.c b/block/genhd.c
index dadf42b..9a4c245 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1369,6 +1369,12 @@ int invalidate_partition(struct gendisk *disk, int partno)
 	if (bdev) {
 		fsync_bdev(bdev);
 		res = __invalidate_device(bdev, true);
+		/*
+		 * When used buffer-mode on raw blockdevice,the disk removed.
+		 * But the vfs don't know.So tell the vfs size of disk
+		 * became zero, the buffer write can return
+		 */
+		i_size_write(bdev->bd_inode, 0);
 		bdput(bdev);
 	}
 	return res;
-- 
1.8.4-rc0
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