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SubjectRe: [PATCH] drdb: Switch to kvfree_rcu() API
On Wed, Dec 15, 2021 at 12:18:37PM +0100, Uladzislau Rezki (Sony) wrote:
> Instead of invoking a synchronize_rcu() to free a pointer
> after a grace period we can directly make use of new API
> that does the same but in more efficient way.
>
> TO: Jens Axboe <axboe@kernel.dk>
> TO: Philipp Reisner <philipp.reisner@linbit.com>
> TO: Jason Gunthorpe <jgg@nvidia.com>
> TO: drbd-dev@lists.linbit.com
> TO: linux-block@vger.kernel.org
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
> ---
> drivers/block/drbd/drbd_nl.c | 9 +++------
> drivers/block/drbd/drbd_receiver.c | 6 ++----
> drivers/block/drbd/drbd_state.c | 3 +--
> 3 files changed, 6 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
> index 44ccf8b4f4b2..28f4d84945fd 100644
> --- a/drivers/block/drbd/drbd_nl.c
> +++ b/drivers/block/drbd/drbd_nl.c
> @@ -1679,8 +1679,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
> drbd_send_sync_param(peer_device);
> }
>
> - synchronize_rcu();
> - kfree(old_disk_conf);
> + kvfree_rcu(old_disk_conf);
> kfree(old_plan);
> mod_timer(&device->request_timer, jiffies + HZ);
> goto success;
> @@ -2511,8 +2510,7 @@ int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
>
> mutex_unlock(&connection->resource->conf_update);
> mutex_unlock(&connection->data.mutex);
> - synchronize_rcu();
> - kfree(old_net_conf);
> + kvfree_rcu(old_net_conf);
>
> if (connection->cstate >= C_WF_REPORT_PARAMS) {
> struct drbd_peer_device *peer_device;
> @@ -2925,8 +2923,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
> new_disk_conf->disk_size = (sector_t)rs.resize_size;
> rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
> mutex_unlock(&device->resource->conf_update);
> - synchronize_rcu();
> - kfree(old_disk_conf);
> + kvfree_rcu(old_disk_conf);
> new_disk_conf = NULL;
> }
>
> diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
> index 1f740e42e457..d73a53242a75 100644
> --- a/drivers/block/drbd/drbd_receiver.c
> +++ b/drivers/block/drbd/drbd_receiver.c
> @@ -3799,8 +3799,7 @@ static int receive_protocol(struct drbd_connection *connection, struct packet_in
> drbd_info(connection, "peer data-integrity-alg: %s\n",
> integrity_alg[0] ? integrity_alg : "(none)");
>
> - synchronize_rcu();
> - kfree(old_net_conf);
> + kvfree_rcu(old_net_conf);
> return 0;
>
> disconnect_rcu_unlock:
> @@ -4168,8 +4167,7 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info
>
> rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
> mutex_unlock(&connection->resource->conf_update);
> - synchronize_rcu();
> - kfree(old_disk_conf);
> + kvfree_rcu(old_disk_conf);
>
> drbd_info(device, "Peer sets u_size to %lu sectors (old: %lu)\n",
> (unsigned long)p_usize, (unsigned long)my_usize);
> diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
> index b8a27818ab3f..826e496821c7 100644
> --- a/drivers/block/drbd/drbd_state.c
> +++ b/drivers/block/drbd/drbd_state.c
> @@ -2071,8 +2071,7 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused)
> conn_free_crypto(connection);
> mutex_unlock(&connection->resource->conf_update);
>
> - synchronize_rcu();
> - kfree(old_conf);
> + kvfree_rcu(old_conf);
> }
>
> if (ns_max.susp_fen) {
> --
> 2.30.2
>
+ Jens Axboe <axboe@kernel.dk>
+ Philipp Reisner <philipp.reisner@linbit.com>
+ Jason Gunthorpe <jgg@nvidia.com>
+ drbd-dev@lists.linbit.com
+ linux-block@vger.kernel.org

--
Vlad Rezki

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