dma-buf: replace dma_buf_export() with dma_buf_export_named()

   associated with this buffer.

   Interface:

      struct dma_buf *dma_buf_export(void *priv, struct dma_buf_ops *ops,

				     size_t size, int flags)

      struct dma_buf *dma_buf_export_named(void *priv, struct dma_buf_ops *ops,

				     size_t size, int flags,

				     const char *exp_name)

   If this succeeds, dma_buf_export allocates a dma_buf structure, and returns a

   pointer to the same. It also associates an anonymous file with this buffer,

   so it can be exported. On failure to allocate the dma_buf object, it returns

   NULL.

   'exp_name' is the name of exporter - to facilitate information while

   debugging.

   Exporting modules which do not wish to provide any specific name may use the

   helper define 'dma_buf_export()', with the same arguments as above, but

   without the last argument; a __FILE__ pre-processor directive will be

   inserted in place of 'exp_name' instead.

2. Userspace gets a handle to pass around to potential buffer-users

   Userspace entity requests for a file-descriptor (fd) which is a handle to the

}

/**

 * dma_buf_export - Creates a new dma_buf, and associates an anon file

 * dma_buf_export_named - Creates a new dma_buf, and associates an anon file

 * with this buffer, so it can be exported.

 * Also connect the allocator specific data and ops to the buffer.

 * Additionally, provide a name string for exporter; useful in debugging.

 *

 * @priv:	[in]	Attach private data of allocator to this buffer

 * @ops:	[in]	Attach allocator-defined dma buf ops to the new buffer.

 * @size:	[in]	Size of the buffer

 * @flags:	[in]	mode flags for the file.

 * @exp_name:	[in]	name of the exporting module - useful for debugging.

 *

 * Returns, on success, a newly created dma_buf object, which wraps the

 * supplied private data and operations for dma_buf_ops. On either missing

 * ops, or error in allocating struct dma_buf, will return negative error.

 *

 */

struct dma_buf *dma_buf_export(void *priv, const struct dma_buf_ops *ops,

				size_t size, int flags)

struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops,

				size_t size, int flags, const char *exp_name)

{

	struct dma_buf *dmabuf;

	struct file *file;

	dmabuf->priv = priv;

	dmabuf->ops = ops;

	dmabuf->size = size;

	dmabuf->exp_name = exp_name;

	file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags);

	return dmabuf;

}

EXPORT_SYMBOL_GPL(dma_buf_export);

EXPORT_SYMBOL_GPL(dma_buf_export_named);

/**

 * @file: file pointer used for sharing buffers across, and for refcounting.

 * @attachments: list of dma_buf_attachment that denotes all devices attached.

 * @ops: dma_buf_ops associated with this buffer object.

 * @exp_name: name of the exporter; useful for debugging.

 * @priv: exporter specific private data for this buffer object.

 */

struct dma_buf {

	struct mutex lock;

	unsigned vmapping_counter;

	void *vmap_ptr;

	const char *exp_name;

	void *priv;

};

							struct device *dev);

void dma_buf_detach(struct dma_buf *dmabuf,

				struct dma_buf_attachment *dmabuf_attach);

struct dma_buf *dma_buf_export(void *priv, const struct dma_buf_ops *ops,

			       size_t size, int flags);

struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops,

			       size_t size, int flags, const char *);

#define dma_buf_export(priv, ops, size, flags)	\

	dma_buf_export_named(priv, ops, size, flags, __FILE__)

int dma_buf_fd(struct dma_buf *dmabuf, int flags);

struct dma_buf *dma_buf_get(int fd);

void dma_buf_put(struct dma_buf *dmabuf);