[PATCH 1/9] block: define io_batch structure

[Jens Axboe <axboe@kernel.dk>]

This adds the io_batch structure, and a helper for defining one on the
stack. It's meant to be used for collecting requests for completion,
with a completion handler defined to be called at the end.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 include/linux/blkdev.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 2a8689e949b4..b39b19dbe7b6 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1298,4 +1298,14 @@ int fsync_bdev(struct block_device *bdev);
 int freeze_bdev(struct block_device *bdev);
 int thaw_bdev(struct block_device *bdev);
 
+struct io_batch {
+	struct request *req_list;
+	void (*complete)(struct io_batch *);
+};
+
+#define DEFINE_IO_BATCH(name)			\
+	struct io_batch name = {		\
+		.req_list = NULL		\
+	}
+
 #endif /* _LINUX_BLKDEV_H */
-- 
2.33.0