From d21ea4bc0f6afbc852f1436c7c691c7b6fed0eb8 Mon Sep 17 00:00:00 2001 From: Stephen Bates Date: Tue, 13 Sep 2016 12:23:16 -0600 Subject: [PATCH] block: enable zeroing of io_poll statistics Allow the io_poll statistics to be zeroed to make for easier logging of polling event. Signed-off-by: Stephen Bates Acked-by: Christoph Hellwig Signed-off-by: Jens Axboe --- block/blk-mq-sysfs.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index ea8c3f58afbd..ac5160eb6862 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -181,6 +181,14 @@ static ssize_t blk_mq_hw_sysfs_poll_show(struct blk_mq_hw_ctx *hctx, char *page) hctx->poll_success); } +static ssize_t blk_mq_hw_sysfs_poll_store(struct blk_mq_hw_ctx *hctx, + const char *page, size_t size) +{ + hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; + + return size; +} + static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx, char *page) { @@ -303,8 +311,9 @@ static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { .show = blk_mq_hw_sysfs_cpus_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_poll = { - .attr = {.name = "io_poll", .mode = S_IRUGO }, + .attr = {.name = "io_poll", .mode = S_IWUSR | S_IRUGO }, .show = blk_mq_hw_sysfs_poll_show, + .store = blk_mq_hw_sysfs_poll_store, }; static struct attribute *default_hw_ctx_attrs[] = { -- 2.39.2