1 files changed, 41 insertions, 0 deletions

diff --git a/include/linux/blk-iopoll.h b/include/linux/blk-iopoll.h
new file mode 100644
index 000000000000..b2e1739a2e7b
--- /dev/null
+++ b/include/linux/blk-iopoll.h
@@ -0,0 +1,41 @@
+#ifndef BLK_IOPOLL_H
+#define BLK_IOPOLL_H
+
+struct blk_iopoll;
+typedef int (blk_iopoll_fn)(struct blk_iopoll *, int);
+
+struct blk_iopoll {
+        struct list_head list;
+        unsigned long state;
+        unsigned long data;
+        int weight;
+        int max;
+        blk_iopoll_fn *poll;
+};
+
+enum {
+        IOPOLL_F_SCHED          = 0,
+        IOPOLL_F_DISABLE        = 1,
+};
+
+static inline int blk_iopoll_sched_prep(struct blk_iopoll *iop)
+{
+        return !test_bit(IOPOLL_F_DISABLE, &iop->state) &&
+                !test_and_set_bit(IOPOLL_F_SCHED, &iop->state);
+}
+
+static inline int blk_iopoll_disable_pending(struct blk_iopoll *iop)
+{
+        return test_bit(IOPOLL_F_DISABLE, &iop->state);
+}
+
+extern void blk_iopoll_sched(struct blk_iopoll *);
+extern void blk_iopoll_init(struct blk_iopoll *, int, blk_iopoll_fn *);
+extern void blk_iopoll_complete(struct blk_iopoll *);
+extern void __blk_iopoll_complete(struct blk_iopoll *);
+extern void blk_iopoll_enable(struct blk_iopoll *);
+extern void blk_iopoll_disable(struct blk_iopoll *);
+
+extern int blk_iopoll_enabled;
+
+#endif