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 <sbates@raithlin.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index ea8c3f5..ac5160e 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -181,6 +181,14 @@
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 @@
.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[] = {