[PATCH V2 0/2] Auto stop async-write on block device when device removed.

[majianpeng <majianpeng@gmail.com>]

For async-write on block device,if device removed,but the vfs don't know it.
It will continue to do.
Patch1 set size of inode of block device to zero when removed disk.By this,vfs know 
disk changed.
Path2 add size-check on blk_aio_write.If pos of write larger than size of inode,it will
return zero.So the user can check disk state.

V2:
patch1:
      -consider the case which disk has partitions
      -move i_size_write into func invalidate_partition
patch2: No change

Jianpeng Ma (2):
  block: Set inode of block_device size to zero when delete gendisk.
  block_dev: Add size check before doing async write on block device.

 block/genhd.c | 6 ++++++
 fs/block_dev.c |  4 ++++
 2 files changed, 10 insertions(+)

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1.8.4-rc0