[RFC PATCH 3/8] block: Add kernel APIs to create & delete block device LED triggers

[Valdis Kl=?utf-8?Q?=c4=93?=tnieks]

On Wed, 28 Jul 2021 20:53:39 -0500, Ian Pilcher said:
> * New file - include/linux/blk-ledtrig.h
>
> Signed-off-by: Ian Pilcher <arequipeno at gmail.com>
> ---
>  block/blk-ledtrig.c         | 152 ++++++++++++++++++++++++++++++++++++
>  include/linux/blk-ledtrig.h |  19 +++++
>  2 files changed, 171 insertions(+)
>  create mode 100644 include/linux/blk-ledtrig.h
>
> diff --git a/block/blk-ledtrig.c b/block/blk-ledtrig.c
> index 345a3b6bdbc6..c69ea1539336 100644
> --- a/block/blk-ledtrig.c
> +++ b/block/blk-ledtrig.c

> +
> +static int __blk_ledtrig_create(const char *const name, const size_t len)

(...)
+	if (blk_ledtrig_find(name, len) != NULL) {
+		pr_warn("blockdev LED trigger named %.*s already exists\n",
+			(int)len, name);

Is pr_warn() the right level for this stuff? I'd think this sort of pilot error should
be pr_info() or even pr_debug(), if mentioned at all.  pr_warn() would be for
something like an unexpected situation like trying to blink an LED but failing.
Simple syntax errors should probably just toss a -EINVAL and return.

(Among other things, this allows a userspace script to spam the
log by simply repeatedly trying to create the same entry)

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