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

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Date:	Sun, 22 Jul 2012 20:34:40 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Ashish Sangwan <ashishsangwan2@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	lczerner@...hat.com, Ashish Sangwan <ashish.sangwan2@...il.com>,
	Namjae Jeon <linkinjeon@...il.com>
Subject: Re: [PATCH v3] ext4: fix hole punch failure when depth is greater
 than 0

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@...il.com>
> Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
> Reviewed-by: Lukas Czerner <lczerner@...hat.com>

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

Thanks for submitting this patch!

	      	       			       	  - Ted
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