linux-kernel - Re: [PATCH 1/1] udf: block-based fs should use generic_write

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Message-ID: <20150401075301.GB26339@quack.suse.cz>
Date:	Wed, 1 Apr 2015 09:53:01 +0200
From:	Jan Kara <jack@...e.cz>
To:	Taesoo Kim <tsgatesv@...il.com>
Cc:	jack@...e.cz, linux-kernel@...r.kernel.org, taesoo@...ech.edu,
	changwoo@...ech.edu, sanidhya@...ech.edu, blee@...ech.edu,
	csong84@...ech.edu
Subject: Re: [PATCH 1/1] udf: block-based fs should use generic_write_end()

On Thu 19-03-15 23:37:59, Taesoo Kim wrote:
> simple_write_end() is for non-block fs, which doesn't invoke
> mark_inode_dirty(). Instead, generic_write_end() correctly
> handles such case when i_size has changed.
> 
> Signed-off-by: Taesoo Kim <tsgatesv@...il.com>
  So simple_write_end() is actually correct in that place. We cannot even
use generic_write_end() because that page doesn't have buffers attached -
it's a special case of a file which is smaller than a block and is packed
in the inode. Please test the patch better next time - this would oops on
you the first time you try to write to such a file. Thanks!

								Honza

> ---
>  fs/udf/file.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/udf/file.c b/fs/udf/file.c
> index 08f3555..28b1dab 100644
> --- a/fs/udf/file.c
> +++ b/fs/udf/file.c
> @@ -112,7 +112,7 @@ const struct address_space_operations udf_adinicb_aops = {
>  	.readpage	= udf_adinicb_readpage,
>  	.writepage	= udf_adinicb_writepage,
>  	.write_begin	= udf_adinicb_write_begin,
> -	.write_end	= simple_write_end,
> +	.write_end	= generic_write_end,
>  	.direct_IO	= udf_adinicb_direct_IO,
>  };
>  
> -- 
> 2.3.3
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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