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

Thomas Schoebel-Theuer
2014-07-01T21:56:50Z

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