linux-ext4 - Re: [PATCH 1/6] fs: add hole punching to fallocate

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Message-ID: <20101116111611.GA4757@quack.suse.cz>
Date:	Tue, 16 Nov 2010 12:16:11 +0100
From:	Jan Kara <jack@...e.cz>
To:	Josef Bacik <josef@...hat.com>
Cc:	david@...morbit.com, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com, cmm@...ibm.com,
	cluster-devel@...hat.com, ocfs2-devel@....oracle.com
Subject: Re: [PATCH 1/6] fs: add hole punching to fallocate

On Mon 15-11-10 12:05:18, Josef Bacik wrote:
> diff --git a/fs/open.c b/fs/open.c
> index 4197b9e..ab8dedf 100644
> --- a/fs/open.c
> +++ b/fs/open.c
> @@ -223,7 +223,7 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
>  		return -EINVAL;
>  
>  	/* Return error if mode is not supported */
> -	if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
> +	if (mode && (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)))
  Why not just:
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) ?

> diff --git a/include/linux/falloc.h b/include/linux/falloc.h
> index 3c15510..851cba2 100644
> --- a/include/linux/falloc.h
> +++ b/include/linux/falloc.h
> @@ -2,6 +2,7 @@
>  #define _FALLOC_H_
>  
>  #define FALLOC_FL_KEEP_SIZE	0x01 /* default is extend size */
> +#define FALLOC_FL_PUNCH_HOLE	0X02 /* de-allocates range */
                                 ^ use lowercase 'x' please...


								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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