linux-kernel - Re: [RFC PATCH 3/6] inotify: use alloc_file instead of doing it internally

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Date:	Fri, 04 Dec 2009 07:58:40 +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 3/6] inotify: use alloc_file instead of doing it internally

On Thu, 03 Dec 2009, Eric Paris wrote:
> inotify basically duplicates everything from alloc-file and init-file.  Use
> the generic vfs functions instead.
> 
> Signed-off-by: Eric Paris <eparis@...hat.com>

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

> ---
> 
>  fs/notify/inotify/inotify_user.c |   23 +++++++++--------------
>  1 files changed, 9 insertions(+), 14 deletions(-)
> 
> diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
> index c40894a..3e03803 100644
> --- a/fs/notify/inotify/inotify_user.c
> +++ b/fs/notify/inotify/inotify_user.c
> @@ -725,6 +725,7 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
>  	struct fsnotify_group *group;
>  	struct user_struct *user;
>  	struct file *filp;
> +	struct dentry *dentry;
>  	int fd, ret;
>  
>  	/* Check the IN_* constants for consistency.  */
> @@ -738,12 +739,6 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
>  	if (fd < 0)
>  		return fd;
>  
> -	filp = get_empty_filp();
> -	if (!filp) {
> -		ret = -ENFILE;
> -		goto out_put_fd;
> -	}
> -
>  	user = get_current_user();
>  	if (unlikely(atomic_read(&user->inotify_devs) >=
>  			inotify_max_user_instances)) {
> @@ -758,11 +753,12 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
>  		goto out_free_uid;
>  	}
>  
> -	filp->f_op = &inotify_fops;
> -	filp->f_path.mnt = mntget(inotify_mnt);
> -	filp->f_path.dentry = dget(inotify_mnt->mnt_root);
> -	filp->f_mapping = filp->f_path.dentry->d_inode->i_mapping;
> -	filp->f_mode = FMODE_READ;
> +	dentry = dget(inotify_mnt->mnt_root);
> +	filp = alloc_file(inotify_mnt, dentry, FMODE_READ, &inotify_fops);
> +	if (!filp) {
> +		ret = -ENFILE;
> +		goto out_dput;
> +	}
>  	filp->f_flags = O_RDONLY | (flags & O_NONBLOCK);
>  	filp->private_data = group;
>  
> @@ -771,11 +767,10 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
>  	fd_install(fd, filp);
>  
>  	return fd;
> -
> +out_dput:
> +	dput(dentry);
>  out_free_uid:
>  	free_uid(user);
> -	put_filp(filp);
> -out_put_fd:
>  	put_unused_fd(fd);
>  	return ret;
>  }
> 
> --
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