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mars/kernel/sy_old/strategy.h
Thomas Schoebel-Theuer 6d9ffefb84 infra: new helper mars_is_mountpoint()
2020-07-31 09:26:16 +02:00

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/*
* MARS Long Distance Replication Software
*
* This file is part of MARS project: http://schoebel.github.io/mars/
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
// OLD CODE => will disappear!
#ifndef _OLD_STRATEGY
#define _OLD_STRATEGY
#define _STRATEGY // call this only in strategy bricks, never in ordinary bricks
#include "../mars.h"
#define MARS_ARGV_MAX 4
/* This _should_ be updated when _compatible_ features
* are added. When somebody may _rely_ on the new feature,
* then this _must_ be updated.
*/
#define OPTIONAL_STRATEGY_VERSION 1
/* transient, to re-disappear */
extern int compat_deletions;
extern int usable_strategy_version;
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_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_running_additional_peers;
extern int mars_run_additional_peers;
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;
extern char *my_id(void);
#define MARS_DENT(TYPE) \
struct list_head dent_link; \
struct list_head dent_hash_link; \
struct list_head dent_quick_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; \
unsigned int d_type; /* from readdir() => often DT_UNKNOWN => don't rely on it, use new_stat.mode instead */ \
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; \
int d_hash; \
int d_proto; \
char d_once_error; \
bool d_killme; \
bool d_use_channel; \
struct kstat new_stat; \
struct kstat old_stat; \
char *new_link; \
char *old_link; \
struct mars_global *d_subtree; \
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[];
#define MARS_GLOBAL_HASH 128
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 dent_quick_anchor;
struct list_head brick_anchor;
wait_queue_head_t main_event;
int global_version;
int deleted_my_border;
int old_deleted_my_border;
int deleted_border;
int deleted_min;
int trigger_mode;
bool main_trigger;
struct list_head dent_hash_anchor[MARS_GLOBAL_HASH];
};
extern void _init_mars_global(struct mars_global *global);
#define init_mars_global(__global) \
do { \
_init_mars_global(__global); \
init_rwsem(&(__global)->dent_mutex); \
init_rwsem(&(__global)->brick_mutex); \
} while(0)
#define alloc_mars_global() \
({ \
struct mars_global *__global; \
\
__global = brick_mem_alloc(sizeof(struct mars_global)); \
init_mars_global(__global); \
__global; \
})
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,
bool use_subtree);
extern int mars_get_dent_list(struct mars_global *global,
const char *path_list,
int allocsize,
mars_dent_checker_fn checker,
int maxdepth);
extern struct mars_dent *mars_find_dent(struct mars_global *global, const char *path);
extern void mars_kill_dent(struct mars_global *global, struct mars_dent *dent);
extern void mars_free_dent(struct mars_global *global, struct mars_dent *dent);
extern void mars_free_dent_all(struct mars_global *global, struct list_head *anchor);
// low-level brick instantiation
int mars_connect(struct mars_input *a, struct mars_output *b);
int mars_disconnect(struct mars_input *a);
extern struct mars_brick *mars_find_brick(struct mars_global *global, const void *brick_type, const char *path);
extern struct mars_brick *mars_make_brick(struct mars_global *global, struct mars_dent *belongs, const void *_brick_type, const char *path, const char *name);
extern int mars_free_brick(struct mars_brick *brick);
extern int mars_kill_brick(struct mars_brick *brick);
extern int mars_kill_brick_all(struct mars_global *global, struct list_head *anchor, bool use_dent_link);
extern int mars_kill_brick_when_possible(struct mars_global *global,
const struct mars_brick_type *type_list[],
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 mars_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 mars_brick *make_brick_all(
struct mars_global *global,
struct mars_dent *belongs,
int (*setup_fn)(struct mars_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[],
int switch_override, // -1 = off, 0 = leave in current state, +1 = create when necessary, +2 = create + switch on
const char *new_fmt,
const char *prev_fmt[],
int prev_count,
...
);
// general MARS infrastructure
#define MARS_ERR_ONCE(dent, args...) if (!dent->d_once_error++) MARS_ERR(args)
bool push_link(const char *peer_name,
const char *src,
const char *dst);
/* General fs wrappers (for abstraction)
*/
extern bool mars_is_mountpoint(const char *pathname);
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_rmdir(const char *path);
extern int mars_unlink(const char *path);
extern char *mars_readlink(const char *newpath);
extern int mars_rename(const char *oldpath, const char *newpath);
extern int mars_chmod(const char *path, mode_t mode);
extern void mars_remaining_space(const char *fspath, loff_t *total, loff_t *remaining);
/* Timestamp Ordering */
#define MARS_DELETED_STR ".deleted"
extern char *ordered_readlink(const char *path);
extern int ordered_unlink(const char *path,
const struct lamport_time *stamp,
int serial,
int mode);
extern int ordered_symlink(const char *oldpath,
const char *newpath,
const struct lamport_time *stamp);
/////////////////////////////////////////////////////////////////////////
extern struct mars_global *mars_global;
extern bool mars_check_inputs(struct mars_brick *brick);
extern bool mars_check_outputs(struct mars_brick *brick);
extern int mars_power_button(struct mars_brick *brick, bool val, bool force_off);
/////////////////////////////////////////////////////////////////////////
// statistics
extern int global_show_statist;
extern int global_show_connections;
void show_statistics(struct mars_global *global, const char *class);
/////////////////////////////////////////////////////////////////////////
// quirk
extern int mars_mem_percent;
extern int mars_mem_gb;
extern int main_checker(struct mars_dent *parent, const char *_name, int namlen, unsigned int d_type, int *prefix, int *serial, bool *use_channel);
/////////////////////////////////////////////////////////////////////////
// init
extern int init_sy(void);
extern void exit_sy(void);
extern int init_sy_net(void);
extern void exit_sy_net(void);
#endif
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