Signed-off-by: Thomas Schoebel-Theuer <[email protected]>
---
include/linux/xio/xio_trans_logger.h | 249 +++++++++++++++++++++++++++++++++++
1 file changed, 249 insertions(+)
create mode 100644 include/linux/xio/xio_trans_logger.h
diff --git a/include/linux/xio/xio_trans_logger.h
b/include/linux/xio/xio_trans_logger.h
new file mode 100644
index 0000000..f499f42
--- /dev/null
+++ b/include/linux/xio/xio_trans_logger.h
@@ -0,0 +1,249 @@
+/* (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG */
+#ifndef XIO_TRANS_LOGGER_H
+#define XIO_TRANS_LOGGER_H
+
+#define REGION_SIZE_BITS (PAGE_SHIFT + 4)
+#define REGION_SIZE (1 << REGION_SIZE_BITS)
+#define LOGGER_QUEUES 4
+
+#include <linux/time.h>
+
+#include <linux/xio.h>
+#include <linux/lib_log.h>
+#include <linux/brick/lib_pairing_heap.h>
+#include <linux/brick/lib_queue.h>
+#include <linux/brick/lib_timing.h>
+
+/************************ global tuning ***********************/
+
+/* 0 = early completion of all writes
+ * 1 = early completion of non-sync
+ * 2 = late completion
+ */
+extern int trans_logger_completion_semantics;
+extern int trans_logger_do_crc;
+extern int trans_logger_mem_usage; /* in KB */
+extern int trans_logger_max_interleave;
+extern int trans_logger_resume;
+extern int trans_logger_replay_timeout; /* in s */
+extern atomic_t global_mshadow_count;
+extern atomic64_t global_mshadow_used;
+
+struct writeback_group {
+ rwlock_t lock;
+ struct trans_logger_brick *leader;
+ loff_t biggest;
+ struct list_head group_anchor;
+
+ /* tuning */
+ struct xio_limiter limiter;
+ int until_percent;
+};
+
+extern struct writeback_group global_writeback;
+
+/******************************************************************/
+
+_PAIRING_HEAP_TYPEDEF(logger, /*empty*/)
+
+struct logger_queue {
+ QUEUE_ANCHOR(logger, loff_t, logger);
+ struct trans_logger_brick *q_brick;
+ const char *q_insert_info;
+ const char *q_pushback_info;
+ const char *q_fetch_info;
+ struct banning q_banning;
+ int no_progress_count;
+ int pushback_count;
+};
+
+struct logger_head {
+ struct list_head lh_head;
+ loff_t *lh_pos;
+ struct pairing_heap_logger ph;
+};
+
+/******************************************************************/
+
+#define TL_INPUT_READ 0
+#define TL_INPUT_WRITEBACK 0
+#define TL_INPUT_LOG1 1
+#define TL_INPUT_LOG2 2
+#define TL_INPUT_NR 3
+
+struct writeback_info {
+ struct trans_logger_brick *w_brick;
+ struct logger_head w_lh;
+ loff_t w_pos;
+ int w_len;
+ int w_error;
+
+ struct list_head w_collect_list; /* list of collected orig requests
*/
+ struct list_head w_sub_read_list; /* for saving the old data before
overwrite */
+ struct list_head w_sub_write_list; /* for overwriting */
+ atomic_t w_sub_read_count;
+ atomic_t w_sub_write_count;
+ atomic_t w_sub_log_count;
+
+ /* make checkpatch.pl happy with a blank line - is this a false
positive? */
+
+ void (*read_endio)(struct generic_callback *cb);
+ void (*write_endio)(struct generic_callback *cb);
+};
+
+struct trans_logger_aio_aspect {
+ GENERIC_ASPECT(aio);
+ struct trans_logger_brick *my_brick;
+ struct trans_logger_input *my_input;
+ struct trans_logger_input *log_input;
+ struct logger_head lh;
+ struct list_head hash_head;
+ struct list_head pos_head;
+ struct list_head replay_head;
+ struct list_head collect_head;
+ struct pairing_heap_logger ph;
+ struct trans_logger_aio_aspect *shadow_aio;
+ struct trans_logger_aio_aspect *orig_aio_a;
+ void *shadow_data;
+ int orig_rw;
+ int wb_error;
+ bool do_dealloc;
+ bool do_buffered;
+ bool is_hashed;
+ bool is_stable;
+ bool is_dirty;
+ bool is_collected;
+ bool is_fired;
+ bool is_completed;
+ bool is_persistent;
+ bool is_emergency;
+ struct timespec stamp;
+ loff_t log_pos;
+ struct generic_callback cb;
+ struct writeback_info *wb;
+ struct list_head sub_list;
+ struct list_head sub_head;
+ int total_sub_count;
+ int alloc_len;
+ atomic_t current_sub_count;
+};
+
+struct trans_logger_hash_anchor;
+
+struct trans_logger_brick {
+ XIO_BRICK(trans_logger);
+ /* parameters */
+ struct xio_limiter *replay_limiter;
+
+ int shadow_mem_limit; /* max # master shadows */
+ bool replay_mode; /* mode of operation */
+ bool continuous_replay_mode; /* mode of operation */
+ bool log_reads; /* additionally log pre-images */
+ bool cease_logging; /* direct IO without logging (only in case of
EMERGENCY) */
+ loff_t replay_start_pos; /* where to start replay */
+ loff_t replay_end_pos; /* end of replay */
+ int new_input_nr; /* whereto we should switchover ASAP */
+ int replay_tolerance; /* how many bytes to ignore at truncated
logfiles */
+ /* readonly from outside */
+ loff_t replay_current_pos; /* end of replay */
+ int log_input_nr; /* where we are currently logging to */
+ int old_input_nr; /* where old IO requests may be on the fly */
+ int replay_code; /* replay errors (if any) */
+ bool stopped_logging; /* direct IO without logging (only in case of
EMERGENCY) */
+ /* private */
+ int disk_io_error; /* replay errors from callbacks */
+ struct trans_logger_hash_anchor **hash_table;
+ struct list_head group_head;
+ loff_t old_margin;
+ spinlock_t replay_lock;
+ struct list_head replay_list;
+ struct task_struct *thread;
+
+ wait_queue_head_t worker_event;
+ wait_queue_head_t caller_event;
+ /* statistics */
+ atomic64_t shadow_mem_used;
+ atomic_t replay_count;
+ atomic_t any_fly_count;
+ atomic_t log_fly_count;
+ atomic_t hash_count;
+ atomic_t mshadow_count;
+ atomic_t sshadow_count;
+ atomic_t outer_balance_count;
+ atomic_t inner_balance_count;
+ atomic_t sub_balance_count;
+ atomic_t wb_balance_count;
+ atomic_t total_hash_insert_count;
+ atomic_t total_hash_find_count;
+ atomic_t total_hash_extend_count;
+ atomic_t total_replay_count;
+ atomic_t total_replay_conflict_count;
+ atomic_t total_cb_count;
+ atomic_t total_read_count;
+ atomic_t total_write_count;
+ atomic_t total_flush_count;
+ atomic_t total_writeback_count;
+ atomic_t total_writeback_cluster_count;
+ atomic_t total_shortcut_count;
+ atomic_t total_mshadow_count;
+ atomic_t total_sshadow_count;
+ atomic_t total_mshadow_buffered_count;
+ atomic_t total_sshadow_buffered_count;
+ atomic_t total_round_count;
+ atomic_t total_restart_count;
+ atomic_t total_delay_count;
+
+ /* queues */
+ struct logger_queue q_phase[LOGGER_QUEUES];
+ bool delay_callers;
+};
+
+struct trans_logger_output {
+ XIO_OUTPUT(trans_logger);
+};
+
+#define MAX_HOST_LEN 32
+
+struct trans_logger_info {
+ /* to be maintained / initialized from outside */
+ void (*inf_callback)(struct trans_logger_info *inf);
+ void *inf_private;
+ char inf_host[MAX_HOST_LEN];
+
+ int inf_sequence; /* logfile sequence number */
+
+ /* maintained by trans_logger */
+ loff_t inf_min_pos; /* current replay position (both in replay mode
and in logging mode) */
+ loff_t inf_max_pos; /* dito, indicating the "dirty" area which could
be potentially "inconsistent" */
+ loff_t inf_log_pos; /* position of transaction logging (may be ahead
of replay position) */
+ struct timespec inf_min_pos_stamp; /* when the data has been
_successfully_ overwritten */
+/* when the data has _started_ overwrite (maybe "trashed" in case of errors /
aborts) */
+ struct timespec inf_max_pos_stamp;
+
+ struct timespec inf_log_pos_stamp; /* stamp from transaction log */
+ bool inf_is_replaying;
+ bool inf_is_logging;
+};
+
+struct trans_logger_input {
+ XIO_INPUT(trans_logger);
+ /* parameters */
+ /* informational */
+ struct trans_logger_info inf;
+
+ /* readonly from outside */
+ atomic_t log_obj_count;
+ atomic_t pos_count;
+ bool is_operating;
+ long long last_jiffies;
+
+ /* private */
+ struct log_status logst;
+ struct list_head pos_list;
+ long long inf_last_jiffies;
+ struct semaphore inf_mutex;
+};
+
+XIO_TYPES(trans_logger);
+
+#endif
--
2.0.0
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