linux-kernel - Re: [PATCH 1/2] fs/anon_inode: Introduce a new lib function, anon_inode_getfile

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Date:	Thu, 11 Jul 2013 18:11:50 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Al Viro <viro@...iv.linux.org.uk>, Benjamin <bcrl@...ck.org>
CC:	tangchen <tangchen@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] fs/anon_inode: Introduce a new lib function, anon_inode_getfile_private()

ping...


On 07/08/2013 06:38 PM, Gu Zheng wrote:

> Introduce a new lib function anon_inode_getfile_private(), it creates a new file
> instance by hooking it up to an anonymous inode, and a dentry that describe the
> "class" of the file, similar to anon_inode_getfile(), but each file holds a
> single inode. Furthermore, anyone who wants to create a private anon file will
> benefit from this change.
> 
> Signed-off-by: Gu Zheng <guz.fnst@...fujitsu.com>
> Signed-off-by: Benjamin LaHaise <bcrl@...ck.org>
> ---
>  fs/anon_inodes.c            |   66 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/anon_inodes.h |    3 ++
>  2 files changed, 69 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
> index 47a65df..85c9618 100644
> --- a/fs/anon_inodes.c
> +++ b/fs/anon_inodes.c
> @@ -109,6 +109,72 @@ static struct file_system_type anon_inode_fs_type = {
>  };
> 
>  /**
> + * anon_inode_getfile_private - creates a new file instance by hooking it up to an
> + *                      anonymous inode, and a dentry that describe the "class"
> + *                      of the file
> + *
> + * @name:    [in]    name of the "class" of the new file
> + * @fops:    [in]    file operations for the new file
> + * @priv:    [in]    private data for the new file (will be file's private_data)
> + * @flags:   [in]    flags
> + *
> + *
> + * Similar to anon_inode_getfile, but each file holds a single inode.
> + *
> + */
> +struct file *anon_inode_getfile_private(const char *name,
> +					const struct file_operations *fops,
> +					void *priv, int flags)
> +{
> +	struct qstr this;
> +	struct path path;
> +	struct file *file;
> +	struct inode *inode;
> +
> +	if (fops->owner && !try_module_get(fops->owner))
> +		return ERR_PTR(-ENOENT);
> +
> +	inode = anon_inode_mkinode(anon_inode_mnt->mnt_sb);
> +	if (IS_ERR(inode)) {
> +		file = ERR_PTR(-ENOMEM);
> +		goto err_module;
> +	}
> +
> +	/*
> +	 * Link the inode to a directory entry by creating a unique name
> +	 * using the inode sequence number.
> +	 */
> +	file = ERR_PTR(-ENOMEM);
> +	this.name = name;
> +	this.len = strlen(name);
> +	this.hash = 0;
> +	path.dentry = d_alloc_pseudo(anon_inode_mnt->mnt_sb, &this);
> +	if (!path.dentry)
> +		goto err_module;
> +
> +	path.mnt = mntget(anon_inode_mnt);
> +
> +	d_instantiate(path.dentry, inode);
> +
> +	file = alloc_file(&path, OPEN_FMODE(flags), fops);
> +	if (IS_ERR(file))
> +		goto err_dput;
> +
> +	file->f_mapping = inode->i_mapping;
> +	file->f_flags = flags & (O_ACCMODE | O_NONBLOCK);
> +	file->private_data = priv;
> +
> +	return file;
> +
> +err_dput:
> +	path_put(&path);
> +err_module:
> +	module_put(fops->owner);
> +	return file;
> +}
> +EXPORT_SYMBOL_GPL(anon_inode_getfile_private);
> +
> +/**
>   * anon_inode_getfile - creates a new file instance by hooking it up to an
>   *                      anonymous inode, and a dentry that describe the "class"
>   *                      of the file
> diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h
> index 8013a45..cf573c2 100644
> --- a/include/linux/anon_inodes.h
> +++ b/include/linux/anon_inodes.h
> @@ -13,6 +13,9 @@ struct file_operations;
>  struct file *anon_inode_getfile(const char *name,
>  				const struct file_operations *fops,
>  				void *priv, int flags);
> +struct file *anon_inode_getfile_private(const char *name,
> +				const struct file_operations *fops,
> +				void *priv, int flags);
>  int anon_inode_getfd(const char *name, const struct file_operations *fops,
>  		     void *priv, int flags);
> 


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