linux-kernel - Re: [RFC PATCH 2/6] pipes: use alloc-file instead of duplicating code

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Date:	Fri, 04 Dec 2009 07:08:35 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Eric Paris <eparis@...hat.com>
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, viro@...iv.linux.org.uk, jmorris@...ei.org,
	npiggin@...e.de, eparis@...hat.com, zohar@...ibm.com, jack@...e.cz,
	jmalicki@...acarta.com, dsmith@...hat.com, serue@...ibm.com,
	hch@....de, john@...nmccutchan.com, rlove@...ve.org,
	ebiederm@...ssion.com, heiko.carstens@...ibm.com,
	penguin-kernel@...ove.SAKURA.ne.jp, mszeredi@...e.cz,
	jens.axboe@...cle.com, akpm@...ux-foundation.org, matthew@....cx,
	hugh.dickins@...cali.co.uk, kamezawa.hiroyu@...fujitsu.com,
	nishimura@....nes.nec.co.jp, davem@...emloft.net, arnd@...db.de,
	eric.dumazet@...il.com
Subject: Re: [RFC PATCH 2/6] pipes: use alloc-file instead of duplicating code

On Thu, 03 Dec 2009, Eric Paris wrote:
> The pipe code duplicates the functionality of alloc-file and init-file.  Use
> the generic vfs functions instead of duplicating code.
> 
> Signed-off-by: Eric Paris <eparis@...hat.com>

Acked-by: Miklos Szeredi <miklos@...redi.hu>

As a side note: I wonder why we aren't passing a "struct path" to
alloc_file() and why are the refcount rules wrt. dentries/vfsmounts so
weird?

> ---
> 
>  fs/pipe.c |   21 +++++++++------------
>  1 files changed, 9 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/pipe.c b/fs/pipe.c
> index ae17d02..5d6c969 100644
> --- a/fs/pipe.c
> +++ b/fs/pipe.c
> @@ -1028,20 +1028,17 @@ void free_write_pipe(struct file *f)
>  
>  struct file *create_read_pipe(struct file *wrf, int flags)
>  {
> -	struct file *f = get_empty_filp();
> -	if (!f)
> -		return ERR_PTR(-ENFILE);
> -
> -	/* Grab pipe from the writer */
> -	f->f_path = wrf->f_path;
> -	path_get(&wrf->f_path);
> -	f->f_mapping = wrf->f_path.dentry->d_inode->i_mapping;
> +	struct file *f;
> +	struct dentry *dentry = wrf->f_path.dentry;
> +	struct vfsmount *mnt = wrf->f_path.mnt;
>  
> -	f->f_pos = 0;
> +	dentry = dget(dentry);
> +	f = alloc_file(mnt, dentry, FMODE_READ, &read_pipefifo_fops);
> +	if (!f) {
> +		dput(dentry);
> +		return ERR_PTR(-ENFILE);
> +	}
>  	f->f_flags = O_RDONLY | (flags & O_NONBLOCK);
> -	f->f_op = &read_pipefifo_fops;
> -	f->f_mode = FMODE_READ;
> -	f->f_version = 0;
>  
>  	return f;
>  }
> 
> --
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