Message-Id: <71de7c5ec1f2f7ecc2ceee4817d2718bd1d15bca.1483138400.git.tst@schoebel-theuer.de>
Date:   Fri, 30 Dec 2016 23:57:50 +0100
From:   Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
To:     linux-kernel@...r.kernel.org, tst@...oebel-theuer.de
Subject: [RFC 24/32] mars: add new module strategy

Signed-off-by: Thomas Schoebel-Theuer <tst@...oebel-theuer.de>
---
 drivers/staging/mars/mars/strategy.h | 239 +++++++++++++++++++++++++++++++++++
 1 file changed, 239 insertions(+)
 create mode 100644 drivers/staging/mars/mars/strategy.h

diff --git a/drivers/staging/mars/mars/strategy.h b/drivers/staging/mars/mars/strategy.h
new file mode 100644
index 000000000000..d570772847c2
--- /dev/null
+++ b/drivers/staging/mars/mars/strategy.h
@@ -0,0 +1,239 @@
+/*
+ * MARS Long Distance Replication Software
+ *
+ * Copyright (C) 2010-2014 Thomas Schoebel-Theuer
+ * Copyright (C) 2011-2014 1&1 Internet AG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+/*  OLD CODE = > will disappear! */
+#ifndef _OLD_STRATEGY
+#define _OLD_STRATEGY
+
+#define _STRATEGY			/*  call this only in strategy bricks, never in ordinary bricks */
+
+#include <linux/xio/xio.h>
+
+#define MARS_ARGV_MAX			4
+
+extern loff_t global_total_space;
+extern loff_t global_remaining_space;
+
+extern int global_logrot_auto;
+extern int global_free_space_0;
+extern int global_free_space_1;
+extern int global_free_space_2;
+extern int global_free_space_3;
+extern int global_free_space_4;
+extern int global_sync_want;
+extern int global_sync_nr;
+extern int global_sync_limit;
+extern int mars_rollover_interval;
+extern int mars_scan_interval;
+extern int mars_propagate_interval;
+extern int mars_sync_flip_interval;
+extern int mars_peer_abort;
+extern int mars_emergency_mode;
+extern int mars_reset_emergency;
+extern int mars_keep_msg;
+
+extern int mars_fast_fullsync;
+
+#define MARS_DENT(TYPE)							\
+	struct list_head dent_link;					\
+	struct list_head brick_list;					\
+	struct TYPE *d_parent;						\
+	char *d_argv[MARS_ARGV_MAX];  /* for internal use, will be automatically deallocated*/\
+	char *d_args; /* ditto uninterpreted */				\
+	char *d_name; /* current path component */			\
+	char *d_rest; /* some "meaningful" rest of d_name*/		\
+	char *d_path; /* full absolute path */				\
+	struct say_channel *d_say_channel; /* for messages */		\
+	loff_t d_corr_A; /* logical size correction */			\
+	loff_t d_corr_B; /* logical size correction */			\
+	int   d_depth;							\
+	/* from readdir() = > often DT_UNKNOWN */			\
+	/* don't rely on it - use stat_val.mode instead */		\
+	unsigned int d_type;						\
+	int   d_class;	  /* for pre-grouping order */			\
+	int   d_serial;   /* for pre-grouping order */			\
+	int   d_version;  /* dynamic programming per call of mars_ent_work() */\
+	int   d_child_count;						\
+	bool d_killme;							\
+	bool d_use_channel;						\
+	struct kstat stat_val;						\
+	char *link_val;							\
+	struct mars_global *d_global;					\
+	void (*d_private_destruct)(void *private);			\
+	void *d_private
+
+struct mars_dent {
+	MARS_DENT(mars_dent);
+};
+
+extern const struct meta mars_kstat_meta[];
+extern const struct meta mars_dent_meta[];
+
+struct mars_global {
+	struct rw_semaphore dent_mutex;
+	struct rw_semaphore brick_mutex;
+	struct generic_switch global_power;
+	struct list_head dent_anchor;
+	struct list_head brick_anchor;
+
+	wait_queue_head_t main_event;
+	int global_version;
+	int deleted_my_border;
+	int deleted_border;
+	int deleted_min;
+	bool main_trigger;
+};
+
+extern void bind_to_dent(struct mars_dent *dent, struct say_channel **ch);
+
+typedef int (
+*mars_dent_checker_fn)(
+struct mars_dent *parent,
+const char *name,
+int namlen,
+unsigned int d_type,
+int *prefix,
+int *serial,
+bool *use_channel);
+
+typedef int (*mars_dent_worker_fn)(struct mars_global *global, struct mars_dent *dent, bool prepare, bool direction);
+
+extern int mars_dent_work(
+struct mars_global *global,
+char *dirname,
+int allocsize,
+
+mars_dent_checker_fn checker,
+mars_dent_worker_fn worker,
+void *buf,
+int maxdepth);
+
+extern struct mars_dent *_mars_find_dent(struct mars_global *global, const char *path);
+extern struct mars_dent *mars_find_dent(struct mars_global *global, const char *path);
+extern int mars_find_dent_all(struct mars_global *global, char *prefix, struct mars_dent ***table);
+extern void xio_kill_dent(struct mars_dent *dent);
+extern void xio_free_dent(struct mars_dent *dent);
+extern void xio_free_dent_all(struct mars_global *global, struct list_head *anchor);
+
+/*  low-level brick instantiation */
+
+extern struct xio_brick *mars_find_brick(struct mars_global *global, const void *brick_type, const char *path);
+extern struct xio_brick *xio_make_brick(
+struct mars_global *global, struct mars_dent *belongs, const void *_brick_type, const char *path, const char *name);
+
+extern int xio_free_brick(struct xio_brick *brick);
+extern int xio_kill_brick(struct xio_brick *brick);
+extern int xio_kill_brick_all(struct mars_global *global, struct list_head *anchor, bool use_dent_link);
+extern int xio_kill_brick_when_possible(
+struct mars_global *global,
+struct list_head *anchor,
+bool use_dent_link,
+const struct xio_brick_type *type,
+bool even_on);
+
+/*  mid-level brick instantiation (identity is based on path strings) */
+
+extern char *_vpath_make(int line, const char *fmt, va_list *args);
+extern char *_path_make(int line, const char *fmt, ...);
+extern char *_backskip_replace(int line, const char *path, char delim, bool insert, const char *fmt, ...);
+
+#define vpath_make(_fmt, _args)						\
+	_vpath_make(__LINE__, _fmt, _args)
+#define path_make(_fmt, _args...)					\
+	_path_make(__LINE__, _fmt, ##_args)
+#define backskip_replace(_path, _delim, _insert, _fmt, _args...)	\
+	_backskip_replace(__LINE__, _path, _delim, _insert, _fmt, ##_args)
+
+extern struct xio_brick *path_find_brick(struct mars_global *global, const void *brick_type, const char *fmt, ...);
+
+/* Create a new brick and connect its inputs to a set of predecessors.
+ * When @timeout > 0, switch on the brick as well as its predecessors.
+ */
+extern struct xio_brick *make_brick_all(
+	struct mars_global *global,
+	struct mars_dent *belongs,
+	int (*setup_fn)(struct xio_brick *brick, void *private),
+	void *private,
+	const char *new_name,
+	const struct generic_brick_type *new_brick_type,
+	const struct generic_brick_type *prev_brick_type[],
+/*  -1 = off, 0 = leave in current state, +1 = create when necessary, +2 = create + switch on */
+	int switch_override,
+	const char *new_fmt,
+	const char *prev_fmt[],
+	int prev_count,
+	...
+	);
+
+/*  general MARS infrastructure */
+
+/* General fs wrappers (for abstraction)
+ */
+extern int mars_stat(const char *path, struct kstat *stat, bool use_lstat);
+extern void mars_sync(void);
+extern int mars_mkdir(const char *path);
+extern int mars_unlink(const char *path);
+extern int mars_symlink(const char *oldpath, const char *newpath, const struct timespec *stamp, uid_t uid);
+extern char *mars_readlink(const char *newpath);
+extern int mars_rename(const char *oldpath, const char *newpath);
+extern void mars_remaining_space(const char *fspath, loff_t *total, loff_t *remaining);
+
+/***********************************************************************/
+
+extern struct mars_global *mars_global;
+
+extern bool xio_check_inputs(struct xio_brick *brick);
+extern bool xio_check_outputs(struct xio_brick *brick);
+
+extern int  mars_power_button(struct xio_brick *brick, bool val, bool force_off);
+
+/***********************************************************************/
+
+/*  statistics */
+
+extern int global_show_statist;
+
+void show_statistics(struct mars_global *global, const char *class);
+
+/***********************************************************************/
+
+/*  quirk */
+
+extern int mars_mem_percent;
+
+extern int main_checker(
+struct mars_dent *parent,
+const char *_name,
+int namlen,
+unsigned int d_type,
+int *prefix,
+int *serial,
+bool *use_channel);
+
+void from_remote_trigger(void);
+
+/***********************************************************************/
+
+/*  init */
+
+extern int init_sy(void);
+extern void exit_sy(void);
+
+extern int init_sy_net(void);
+extern void exit_sy_net(void);
+
+#endif
-- 
2.11.0

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