dma-buf: add show_fdinfo handler (bcc07111) · Commits · 戴 / test

The show_fdinfo handler exports the same information available through debugfs on a per-buffer basis. Signed-off-by:

drivers/dma-buf/dma-buf.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -401,6 +401,20 @@ static long dma_buf_ioctl(struct file *file,
		}
		}

		static void dma_buf_show_fdinfo(struct seq_file m, struct file file)
		{
		struct dma_buf *dmabuf = file->private_data;

		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);
		seq_printf(m, "exp_name:\t%s\n", dmabuf->exp_name);
		mutex_lock(&dmabuf->lock);
		if (dmabuf->name)
		seq_printf(m, "name:\t%s\n", dmabuf->name);
		mutex_unlock(&dmabuf->lock);
		}

		static const struct file_operations dma_buf_fops = {
		.release = dma_buf_release,
		.mmap = dma_buf_mmap_internal,
		@@ -410,6 +424,7 @@ static const struct file_operations dma_buf_fops = {
		#ifdef CONFIG_COMPAT
		.compat_ioctl = dma_buf_ioctl,
		#endif
		.show_fdinfo = dma_buf_show_fdinfo,
		};

		/*