linux-kernel - Re: [PATCH 1/1] fallocate: create FAN_MODIFY and IN

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Date:	Mon, 6 Oct 2014 16:12:27 +0200
From:	Jan Kara <jack@...e.cz>
To:	Heinrich Schuchardt <xypron.glpk@....de>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jan Kara <jack@...e.cz>, Eric Paris <eparis@...isplace.org>,
	John McCutchan <john@...nmccutchan.com>,
	Robert Love <rlove@...ve.org>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH 1/1] fallocate: create FAN_MODIFY and IN_MODIFY events

On Fri 03-10-14 10:19:30, Heinrich Schuchardt wrote:
> The fanotify and the inotify API can used to monitor changes of the file
> system.
> 
> System call fallocate modifies files. Hence it should trigger the corresponding
> fanotify (FAN_MODIFY) and inotify (IN_MODIFY) events.
> 
> This patch adds the missing call to fsnotify_modify.
  Well, there are different fallocate() commands and e.g. pure
FALLOC_FL_KEEP_SIZE call will not change any data in the file. I'm not sure
how much we care but I wanted to point that out...

								Honza

> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  fs/open.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/fs/open.c b/fs/open.c
> index d6fd3ac..03aa8e5 100644
> --- a/fs/open.c
> +++ b/fs/open.c
> @@ -295,6 +295,11 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
>  
>  	sb_start_write(inode->i_sb);
>  	ret = file->f_op->fallocate(file, mode, offset, len);
> +
> +	/* Create inotify and fanotify events. */
> +	if (ret == 0)
> +		fsnotify_modify(file);
> +
>  	sb_end_write(inode->i_sb);
>  	return ret;
>  }
> -- 
> 2.1.0
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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