From: Greg Hackmann ghackmann@google.com
The show_fdinfo handler exports the same information available through debugfs on a per-buffer basis.
Signed-off-by: Greg Hackmann ghackmann@google.com Signed-off-by: Chenbo Feng fengc@google.com --- drivers/dma-buf/dma-buf.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index f5e8d4fab950..fc7be2939ba1 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -383,6 +383,20 @@ 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, @@ -392,6 +406,7 @@ static const struct file_operations dma_buf_fops = { #ifdef CONFIG_COMPAT .compat_ioctl = dma_buf_ioctl, #endif + .show_fdinfo = dma_buf_show_fdinfo, };
/*