linux-kernel - Re: [PATCH 06/10] block: rbd: convert to use BUS_ATTR

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Date:   Fri, 21 Dec 2018 10:28:48 +0100
From:   Ilya Dryomov <idryomov@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Sage Weil <sage@...hat.com>,
        Alex Elder <elder@...nel.org>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 06/10] block: rbd: convert to use BUS_ATTR_WO and RO

On Fri, Dec 21, 2018 at 8:55 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> We are trying to get rid of BUS_ATTR() and the usage of that in rbd.c
> can be trivially converted to use BUS_ATTR_WO and RO, so use those
> macros instead.
>
> Cc: Ilya Dryomov <idryomov@...il.com>
> Cc: Sage Weil <sage@...hat.com>
> Cc: Alex Elder <elder@...nel.org>
> Cc: Jens Axboe <axboe@...nel.dk>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/block/rbd.c | 45 +++++++++++++++++++--------------------------
>  1 file changed, 19 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
> index 8e5140bbf241..d871d364fdcf 100644
> --- a/drivers/block/rbd.c
> +++ b/drivers/block/rbd.c
> @@ -428,14 +428,13 @@ static bool single_major = true;
>  module_param(single_major, bool, 0444);
>  MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)");
>
> -static ssize_t rbd_add(struct bus_type *bus, const char *buf,
> -                      size_t count);
> -static ssize_t rbd_remove(struct bus_type *bus, const char *buf,
> -                         size_t count);
> -static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf,
> -                                   size_t count);
> -static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf,
> -                                      size_t count);
> +static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count);
> +static ssize_t remove_store(struct bus_type *bus, const char *buf,
> +                           size_t count);
> +static ssize_t add_single_major_store(struct bus_type *bus, const char *buf,
> +                                     size_t count);
> +static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf,
> +                                        size_t count);
>  static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth);
>
>  static int rbd_dev_id_to_minor(int dev_id)
> @@ -464,16 +463,16 @@ static bool rbd_is_lock_owner(struct rbd_device *rbd_dev)
>         return is_lock_owner;
>  }
>
> -static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf)
> +static ssize_t supported_features_show(struct bus_type *bus, char *buf)
>  {
>         return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED);
>  }
>
> -static BUS_ATTR(add, 0200, NULL, rbd_add);
> -static BUS_ATTR(remove, 0200, NULL, rbd_remove);
> -static BUS_ATTR(add_single_major, 0200, NULL, rbd_add_single_major);
> -static BUS_ATTR(remove_single_major, 0200, NULL, rbd_remove_single_major);
> -static BUS_ATTR(supported_features, 0444, rbd_supported_features_show, NULL);
> +static BUS_ATTR_WO(add);
> +static BUS_ATTR_WO(remove);
> +static BUS_ATTR_WO(add_single_major);
> +static BUS_ATTR_WO(remove_single_major);
> +static BUS_ATTR_RO(supported_features);
>
>  static struct attribute *rbd_bus_attrs[] = {
>         &bus_attr_add.attr,
> @@ -5934,9 +5933,7 @@ static ssize_t do_rbd_add(struct bus_type *bus,
>         goto out;
>  }
>
> -static ssize_t rbd_add(struct bus_type *bus,
> -                      const char *buf,
> -                      size_t count)
> +static ssize_t add_store(struct bus_type *bus, const char *buf, size_t count)
>  {
>         if (single_major)
>                 return -EINVAL;
> @@ -5944,9 +5941,8 @@ static ssize_t rbd_add(struct bus_type *bus,
>         return do_rbd_add(bus, buf, count);
>  }
>
> -static ssize_t rbd_add_single_major(struct bus_type *bus,
> -                                   const char *buf,
> -                                   size_t count)
> +static ssize_t add_single_major_store(struct bus_type *bus, const char *buf,
> +                                     size_t count)
>  {
>         return do_rbd_add(bus, buf, count);
>  }
> @@ -6050,9 +6046,7 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
>         return count;
>  }
>
> -static ssize_t rbd_remove(struct bus_type *bus,
> -                         const char *buf,
> -                         size_t count)
> +static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count)
>  {
>         if (single_major)
>                 return -EINVAL;
> @@ -6060,9 +6054,8 @@ static ssize_t rbd_remove(struct bus_type *bus,
>         return do_rbd_remove(bus, buf, count);
>  }
>
> -static ssize_t rbd_remove_single_major(struct bus_type *bus,
> -                                      const char *buf,
> -                                      size_t count)
> +static ssize_t remove_single_major_store(struct bus_type *bus, const char *buf,
> +                                        size_t count)
>  {
>         return do_rbd_remove(bus, buf, count);
>  }

Acked-by: Ilya Dryomov <idryomov@...il.com>

Thanks,

                Ilya