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authorMing Lei <ming.lei@redhat.com>2020-05-14 16:45:09 +0800
committerJens Axboe <axboe@kernel.dk>2020-05-14 08:06:04 -0600
commit71ac860af824ce9ebbbe8de20044e777c0fc33b9 (patch)
treea060314e64f575390ed43d4009778bc6ce27826d /block/blk-core.c
parent02ef12a663c7ac24b06146d0ed3137848edb0676 (diff)
downloadlwn-71ac860af824ce9ebbbe8de20044e777c0fc33b9.tar.gz
lwn-71ac860af824ce9ebbbe8de20044e777c0fc33b9.zip
block: move blk_io_schedule() out of header file
blk_io_schedule() isn't called from performance sensitive code path, and it is easier to maintain by exporting it as symbol. Also blk_io_schedule() is only called by CONFIG_BLOCK code, so it is safe to do this way. Meantime fixes build failure when CONFIG_BLOCK is off. Cc: Christoph Hellwig <hch@infradead.org> Fixes: e6249cdd46e4 ("block: add blk_io_schedule() for avoiding task hung in sync dio") Reported-by: Satya Tangirala <satyat@google.com> Tested-by: Satya Tangirala <satyat@google.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index cf5b2163edfe..7c1587b45427 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -38,6 +38,7 @@
#include <linux/debugfs.h>
#include <linux/bpf.h>
#include <linux/psi.h>
+#include <linux/sched/sysctl.h>
#define CREATE_TRACE_POINTS
#include <trace/events/block.h>
@@ -1812,6 +1813,18 @@ void blk_finish_plug(struct blk_plug *plug)
}
EXPORT_SYMBOL(blk_finish_plug);
+void blk_io_schedule(void)
+{
+ /* Prevent hang_check timer from firing at us during very long I/O */
+ unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2;
+
+ if (timeout)
+ io_schedule_timeout(timeout);
+ else
+ io_schedule();
+}
+EXPORT_SYMBOL_GPL(blk_io_schedule);
+
int __init blk_dev_init(void)
{
BUILD_BUG_ON(REQ_OP_LAST >= (1 << REQ_OP_BITS));