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https://github.com/schoebel/mars
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94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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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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#include <linux/semaphore.h>
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#define INPUT_A_IO 0
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#define INPUT_A_COPY 1
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#define INPUT_B_IO 2
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#define INPUT_B_COPY 3
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extern int mars_copy_overlap;
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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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enum {
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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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};
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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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char state;
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bool writeout;
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short prev;
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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_brick *brick;
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int queue;
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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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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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unsigned long 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 semaphore mutex;
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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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};
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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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