Re: [PATCH v3] ext4: fix hole punch failure when depth is greater than 0

[Theodore Ts'o <tytso@mit.edu>]

On Tue, Jul 10, 2012 at 09:56:10PM +0530, Ashish Sangwan wrote:
> Whether to continue removing extents or not is decided by the return value
> of function ext4_ext_more_to_rm() which checks 2 conditions:
> a) if there are no more indexes to process.
> b) if the number of entries are decreased in the header of "depth -1".
> 
> In case of hole punch, if the last block to be removed is not part of the
> last extent index than this index will not be deleted, hence the number of
> valid entries in the extent header of "depth - 1" will remain as it is and
> ext4_ext_more_to_rm will return 0 although the required blocks are not
> yet removed.
> 
> This patch fixes the above mentioned problem as instead of removing the
> extents from the end of file, it starts removing the blocks from the
> particular extent from which removing blocks is actually required and
> continue backward until done.
> 
> Signed-off-by: Ashish Sangwan <ashish.sangwan2@gmail.com>
> Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
> Reviewed-by: Lukas Czerner <lczerner@redhat.com>

Applied, with a cc: to stable@kernel.org since it is a bug fix.

Thanks for submitting this patch!

	      	       			       	  - Ted