[PATCH 33/50] mars: add new file include/linux/xio/xio_if.h

[Thomas Schoebel-Theuer]

Signed-off-by: Thomas Schoebel-Theuer <tst@xxxxxxxxxxxxxxxxxx>
---
 include/linux/xio/xio_if.h | 93 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 include/linux/xio/xio_if.h

diff --git a/include/linux/xio/xio_if.h b/include/linux/xio/xio_if.h
new file mode 100644
index 0000000..ec7f226
--- /dev/null
+++ b/include/linux/xio/xio_if.h
@@ -0,0 +1,93 @@
+/*  (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG */
+#ifndef XIO_IF_H
+#define XIO_IF_H
+
+#include <linux/semaphore.h>
+
+#define HT_SHIFT			6 /* ???? */
+#define XIO_MAX_SEGMENT_SIZE		(1U << (9+HT_SHIFT))
+
+#define MAX_BIO				32
+
+/************************ global tuning ***********************/
+
+extern int if_throttle_start_size; /*  in kb */
+extern struct xio_limiter if_throttle;
+
+/***********************************************/
+
+/* I don't want to enhance / intrude into struct bio for compatibility reasons
+ * (support for a variety of kernel versions).
+ * The following is just a silly workaround which could be removed again.
+ */
+struct bio_wrapper {
+	struct bio *bio;
+	atomic_t bi_comp_cnt;
+	unsigned long start_time;
+};
+
+struct if_aio_aspect {
+	GENERIC_ASPECT(aio);
+	struct list_head plug_head;
+	struct list_head hash_head;
+	int hash_index;
+	int bio_count;
+	int current_len;
+	int max_len;
+	struct page *orig_page;
+	struct bio_wrapper *orig_biow[MAX_BIO];
+	struct if_input *input;
+};
+
+struct if_hash_anchor;
+
+struct if_input {
+	XIO_INPUT(if);
+	/*  TODO: move this to if_brick (better systematics) */
+	struct list_head plug_anchor;
+	struct request_queue *q;
+	struct gendisk *disk;
+	struct block_device *bdev;
+	loff_t capacity;
+	atomic_t plugged_count;
+	atomic_t flying_count;
+
+	/*  only for statistics */
+	atomic_t read_flying_count;
+	atomic_t write_flying_count;
+	atomic_t total_reada_count;
+	atomic_t total_read_count;
+	atomic_t total_write_count;
+	atomic_t total_empty_count;
+	atomic_t total_fire_count;
+	atomic_t total_skip_sync_count;
+	atomic_t total_aio_read_count;
+	atomic_t total_aio_write_count;
+	spinlock_t req_lock;
+	struct semaphore kick_sem;
+	struct if_hash_anchor *hash_table;
+};
+
+struct if_output {
+	XIO_OUTPUT(if);
+};
+
+struct if_brick {
+	XIO_BRICK(if);
+	/*  parameters */
+	loff_t dev_size;
+	int max_plugged;
+	int readahead;
+	bool skip_sync;
+
+	/*  inspectable */
+	atomic_t open_count;
+
+	/*  private */
+	struct semaphore switch_sem;
+	struct say_channel *say_channel;
+};
+
+XIO_TYPES(if);
+
+#endif
-- 
2.0.0

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