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@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);