blk: pass from_schedule to non-request unplug functions.
This will allow md/raid to know why the unplug was called,
and will be able to act according - if !from_schedule it
is safe to perform tasks which could themselves schedule.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-core.c b/block/blk-core.c
index 35bf4fe..4b4dbdf 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2909,7 +2909,7 @@
}
-static void flush_plug_callbacks(struct blk_plug *plug)
+static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule)
{
LIST_HEAD(callbacks);
@@ -2921,7 +2921,7 @@
struct blk_plug_cb,
list);
list_del(&cb->list);
- cb->callback(cb);
+ cb->callback(cb, from_schedule);
}
}
}
@@ -2961,7 +2961,7 @@
BUG_ON(plug->magic != PLUG_MAGIC);
- flush_plug_callbacks(plug);
+ flush_plug_callbacks(plug, from_schedule);
if (list_empty(&plug->list))
return;
diff --git a/drivers/block/umem.c b/drivers/block/umem.c
index 6ef3489..eb0d821 100644
--- a/drivers/block/umem.c
+++ b/drivers/block/umem.c
@@ -513,7 +513,7 @@
}
}
-static void mm_unplug(struct blk_plug_cb *cb)
+static void mm_unplug(struct blk_plug_cb *cb, bool from_schedule)
{
struct cardinfo *card = cb->data;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index b493fa4..db02d2e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -498,7 +498,7 @@
}
EXPORT_SYMBOL(md_flush_request);
-void md_unplug(struct blk_plug_cb *cb)
+void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
{
struct mddev *mddev = cb->data;
md_wakeup_thread(mddev->thread);
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 8f998e0..f385b03 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -629,7 +629,7 @@
struct mddev *mddev);
extern void md_trim_bio(struct bio *bio, int offset, int size);
-extern void md_unplug(struct blk_plug_cb *cb);
+extern void md_unplug(struct blk_plug_cb *cb, bool from_schedule);
static inline int mddev_check_plugged(struct mddev *mddev)
{
return !!blk_check_plugged(md_unplug, mddev,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 607ca22..4e72a9d 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -923,7 +923,7 @@
#define BLK_MAX_REQUEST_COUNT 16
struct blk_plug_cb;
-typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *);
+typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
struct blk_plug_cb {
struct list_head list;
blk_plug_cb_fn callback;