linux-kernel - Re: [PATCH 1/2 linux-next] fs/affs/inode.c: mark new inode before hashtable insertion

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Date:	Wed, 6 May 2015 09:04:08 +0200
From:	Jan Kara <jack@...e.cz>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 1/2 linux-next] fs/affs/inode.c: mark new inode before
 hashtable insertion

On Tue 05-05-15 20:06:09, Fabian Frederick wrote:
> AFFS didn't mark new inode to I_NEW state like other FS
> using insert_inode_locked() during creation.
> This patch also unlocks inode when setup is complete
> or operation failed.
> 
> Problem appeared when trying to add tmpfile support.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: Jan Kara <jack@...e.cz>
> Suggested-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  fs/affs/inode.c | 2 ++
>  fs/affs/namei.c | 6 ++++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/fs/affs/inode.c b/fs/affs/inode.c
> index 1734950..859a9cb 100644
> --- a/fs/affs/inode.c
> +++ b/fs/affs/inode.c
> @@ -323,6 +323,8 @@ affs_new_inode(struct inode *dir)
>  	AFFS_I(inode)->i_pa_cnt = 0;
>  	AFFS_I(inode)->i_extcnt = 1;
>  	AFFS_I(inode)->i_ext_last = ~1;
> +	if (insert_inode_locked(inode) < 0)
> +		goto err_inode;
>  
>  	insert_inode_hash(inode);
  But you need to also remove insert_inode_hash() to avoid double insert.
Otherwise the patch looks good.

								Honza

>  
> diff --git a/fs/affs/namei.c b/fs/affs/namei.c
> index 181e05b..b183540 100644
> --- a/fs/affs/namei.c
> +++ b/fs/affs/namei.c
> @@ -281,9 +281,11 @@ affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
>  	error = affs_add_entry(dir, inode, dentry, ST_FILE);
>  	if (error) {
>  		clear_nlink(inode);
> +		unlock_new_inode(inode);
>  		iput(inode);
>  		return error;
>  	}
> +	unlock_new_inode(inode);
>  	return 0;
>  }
>  
> @@ -310,9 +312,11 @@ affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
>  	if (error) {
>  		clear_nlink(inode);
>  		mark_inode_dirty(inode);
> +		unlock_new_inode(inode);
>  		iput(inode);
>  		return error;
>  	}
> +	unlock_new_inode(inode);
>  	return 0;
>  }
>  
> @@ -391,11 +395,13 @@ affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
>  	if (error)
>  		goto err;
>  
> +	unlock_new_inode(inode);
>  	return 0;
>  
>  err:
>  	clear_nlink(inode);
>  	mark_inode_dirty(inode);
> +	unlock_new_inode(inode);
>  	iput(inode);
>  	return error;
>  }
> -- 
> 1.9.1
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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