mars/mars_copy.h

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// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
#ifndef MARS_COPY_H
#define MARS_COPY_H
#include <linux/wait.h>
#include <linux/semaphore.h>
#define INPUT_A_IO 0
#define INPUT_A_COPY 1
#define INPUT_B_IO 2
#define INPUT_B_COPY 3
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//#define COPY_CHUNK (64 * 1024)
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#define COPY_CHUNK (PAGE_SIZE)
#define MAX_COPY_PARA (4 * 1024 * 1024 / COPY_CHUNK)
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enum {
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COPY_STATE_START = 0,
COPY_STATE_READ1 = 1,
COPY_STATE_READ2 = 2,
COPY_STATE_WRITE = 3,
COPY_STATE_WRITTEN = 4,
COPY_STATE_CLEANUP = 5,
COPY_STATE_FINISHED = 6,
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};
struct copy_state {
struct mref_object *table[2];
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bool active[2];
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char state;
short prev;
short len;
short error;
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};
struct copy_mref_aspect {
GENERIC_ASPECT(mref);
struct copy_brick *brick;
int queue;
};
struct copy_brick {
MARS_BRICK(copy);
// parameters
volatile loff_t copy_start;
volatile loff_t copy_end; // stop working if == 0
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int io_prio;
int append_mode; // 1 = passively, 2 = actively
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bool verify_mode;
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bool utilize_mode; // utilize already copied data
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
int copy_error;
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bool low_dirty;
// internal
volatile bool trigger;
volatile unsigned long clash;
atomic_t io_flight;
atomic_t copy_flight;
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long long last_jiffies;
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wait_queue_head_t event;
struct semaphore mutex;
struct task_struct *thread;
struct generic_object_layout mref_object_layout;
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struct copy_state st[MAX_COPY_PARA];
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};
struct copy_input {
MARS_INPUT(copy);
};
struct copy_output {
MARS_OUTPUT(copy);
};
MARS_TYPES(copy);
#endif