linux-kernel - Re: [RFC PATCH 1/6] shmem: use alloc_file instead of init

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Date:	Fri, 04 Dec 2009 06:58:41 +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 1/6] shmem: use alloc_file instead of init_file

On Thu, 03 Dec 2009, Eric Paris wrote:
> shmem uses get_empty_filp() and then init_file().  Their is no good reason
> not to just use alloc_file() like everything else.

There's a more in this patch, though, and none of that is explained...

> 
> Signed-off-by: Eric Paris <eparis@...hat.com>
> ---
> 
>  mm/shmem.c |   20 ++++++++++----------
>  1 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 356dd99..831f8bb 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -2640,32 +2640,32 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
>  	if (!dentry)
>  		goto put_memory;
>  
> -	error = -ENFILE;
> -	file = get_empty_filp();
> -	if (!file)
> -		goto put_dentry;
> -
>  	error = -ENOSPC;
>  	inode = shmem_get_inode(root->d_sb, S_IFREG | S_IRWXUGO, 0, flags);
>  	if (!inode)
> -		goto close_file;
> +		goto put_dentry;
>  
>  	d_instantiate(dentry, inode);
>  	inode->i_size = size;
>  	inode->i_nlink = 0;	/* It is unlinked */
> -	init_file(file, shm_mnt, dentry, FMODE_WRITE | FMODE_READ,
> -		  &shmem_file_operations);
> +
> +	error = -ENFILE;
> +	file = alloc_file(shm_mnt, dentry, FMODE_WRITE | FMODE_READ,
> +			  &shmem_file_operations);
> +	if (!file)
> +		goto put_dentry;
>  
>  #ifndef CONFIG_MMU
>  	error = ramfs_nommu_expand_for_mapping(inode, size);
>  	if (error)
>  		goto close_file;
>  #endif
> -	ima_counts_get(file);

Where's this gone?

>  	return file;
>  
> +#ifndef CONFIG_MMU
>  close_file:

I suggest moving this piece of cleanup into the ifdef above, instead
of adding more ifdefs.

> -	put_filp(file);
> +	fput(file);

OK, put_filp() seems to have been wrong here, but please document it
in the changelog.

> +#endif
>  put_dentry:
>  	dput(dentry);
>  put_memory:
> 
> --
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