| Message ID | 20210204232854.451676-2-kaleshsingh@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/2] procfs: Allow reading fdinfo with PTRACE_MODE_READ | expand |
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); >
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);
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> --- Changes in v2: - Update patch desciption drivers/dma-buf/dma-buf.c | 1 + 1 file changed, 1 insertion(+)