[PATCH v2 2/2] dmabuf: Add dmabuf inode number to /proc/*/fdinfo

[Randy Dunlap]

On 2/4/21 3:28 PM, Kalesh Singh wrote:
> If a FD refers to a DMA buffer add the DMA buffer inode number to
> /proc/<pid>/fdinfo/<FD> and /proc/<pid>/task/<tid>/fdindo/<FD>.
> 
> The dmabuf inode number allows userspace to uniquely identify the buffer
> and avoids a dependency on /proc/<pid>/fd/* when accounting per-process
> DMA buffer sizes.
> 
> Signed-off-by: Kalesh Singh <kaleshsingh at google.com>
> ---

Hi,
Please document this change in
Documentation/filesystems/proc.rst.

Thanks.

> 
> Changes in v2: 
>   - Update patch desciption
> 
>  drivers/dma-buf/dma-buf.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index 9ad6397aaa97..d869099ede83 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -414,6 +414,7 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file)
>  {
>  	struct dma_buf *dmabuf = file->private_data;
>  
> +	seq_printf(m, "dmabuf_inode_no:\t%lu\n", file_inode(file)->i_ino);
>  	seq_printf(m, "size:\t%zu\n", dmabuf->size);
>  	/* Don't count the temporary reference taken inside procfs seq_show */
>  	seq_printf(m, "count:\t%ld\n", file_count(dmabuf->file) - 1);
> 


-- 
~Randy