mirror of https://github.com/schoebel/mars
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/*
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* MARS Long Distance Replication Software
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*
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* This file is part of MARS project: http://schoebel.github.io/mars/
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*
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* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
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* Copyright (C) 2011-2014 1&1 Internet AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MARS_COPY_H
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#define MARS_COPY_H
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#include <linux/wait.h>
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#define INPUT_A 0
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#define INPUT_B 1
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#define COPY_INPUT_NR 2
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extern int mars_copy_overlap;
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extern int mars_copy_strict_write_order;
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extern int mars_copy_timeout;
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extern int mars_copy_read_prio;
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extern int mars_copy_write_prio;
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extern int mars_copy_read_max_fly;
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extern int mars_copy_write_max_fly;
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extern atomic_t global_copy_read_flight;
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extern atomic_t global_copy_write_flight;
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enum _copy_state {
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COPY_STATE_RESET = -1,
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COPY_STATE_START = 0, // don't change this, it _must_ be zero
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COPY_STATE_START2,
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COPY_STATE_READ1,
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COPY_STATE_READ2,
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COPY_STATE_READ3,
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COPY_STATE_WRITE,
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COPY_STATE_WRITTEN,
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COPY_STATE_CLEANUP,
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COPY_STATE_FINISHED,
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} __packed;
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struct copy_state {
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struct mref_object *table[2];
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bool active[2];
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enum _copy_state state;
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bool writeout;
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unsigned short len;
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short error;
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};
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struct copy_mref_aspect {
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GENERIC_ASPECT(mref);
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struct copy_input *input;
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struct copy_brick *brick;
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#ifdef CONFIG_MARS_DEBUG
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/* paranoia, only for testing */
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loff_t orig_ref_pos;
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int orig_ref_len;
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#endif
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unsigned saved_queue;
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unsigned saved_index;
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};
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struct copy_brick {
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MARS_BRICK(copy);
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// parameters
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struct mars_limiter *copy_limiter;
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loff_t copy_start;
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loff_t copy_end; // stop working if == 0
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int io_prio;
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int append_mode; // 1 = passively, 2 = actively
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bool verify_mode; // 0 = copy, 1 = checksum+compare
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bool repair_mode; // whether to repair in case of verify errors
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bool recheck_mode; // whether to re-check after repairs (costs performance)
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bool utilize_mode; // utilize already copied data
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bool abort_mode; // abort on IO error (default is retry forever)
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// readonly from outside
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loff_t copy_last; // current working position
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loff_t copy_dirty; // end of current working area
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struct lamport_time copy_last_stamp;
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struct lamport_time copy_shutdown_started;
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int copy_error;
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int copy_error_count;
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int verify_ok_count;
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int verify_error_count;
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bool low_dirty;
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bool is_aborting;
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// internal
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bool trigger;
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bool terminated;
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loff_t stable_copy_start;
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loff_t stable_copy_end;
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bool clash;
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atomic_t total_clash_count;
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atomic_t io_flight;
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atomic_t copy_read_flight;
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atomic_t copy_write_flight;
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long long last_jiffies;
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wait_queue_head_t event;
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struct task_struct *thread;
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struct copy_state **st;
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};
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struct copy_input {
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MARS_INPUT(copy);
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loff_t check_hint;
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};
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struct copy_output {
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MARS_OUTPUT(copy);
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};
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MARS_TYPES(copy);
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#endif
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