On Mon, Dec 23, 2019 at 3:32 PM Chen Wandun <chenwandun@xxxxxxxxxx> wrote:
>
> Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE
> for debugfs files.
>
> Semantic patch information:
> Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
> imposes some significant overhead as compared to
> DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().
>
> Signed-off-by: Chen Wandun <chenwandun@xxxxxxxxxx>
> ---
> fs/ceph/debugfs.c | 14 +++++++-------
> 1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
> index c281f32..60a0f1a 100644
> --- a/fs/ceph/debugfs.c
> +++ b/fs/ceph/debugfs.c
> @@ -243,8 +243,8 @@ static int congestion_kb_get(void *data, u64 *val)
> return 0;
> }
>
> -DEFINE_SIMPLE_ATTRIBUTE(congestion_kb_fops, congestion_kb_get,
> - congestion_kb_set, "%llu\n");
> +DEFINE_DEBUGFS_ATTRIBUTE(congestion_kb_fops, congestion_kb_get,
> + congestion_kb_set, "%llu\n");
>
>
> void ceph_fs_debugfs_cleanup(struct ceph_fs_client *fsc)
> @@ -264,11 +264,11 @@ void ceph_fs_debugfs_init(struct ceph_fs_client *fsc)
>
> dout("ceph_fs_debugfs_init\n");
> fsc->debugfs_congestion_kb =
> - debugfs_create_file("writeback_congestion_kb",
> - 0600,
> - fsc->client->debugfs_dir,
> - fsc,
> - &congestion_kb_fops);
> + debugfs_create_file_unsafe("writeback_congestion_kb",
> + 0600,
> + fsc->client->debugfs_dir,
> + fsc,
> + &congestion_kb_fops);
Hi Chen,
debugfs_create_file_unsafe() has "unsafe" in its name for a reason.
Have you verified that this conversion is safe?
Thanks,
Ilya
