mars/mars_copy.h

80 lines
1.5 KiB
C

// (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
//#define COPY_CHUNK (64 * 1024)
#define COPY_CHUNK (PAGE_SIZE)
#define MAX_COPY_PARA (4 * 1024 * 1024 / COPY_CHUNK)
enum {
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,
};
struct copy_state {
struct mref_object *table[2];
bool active[2];
char state;
short prev;
short len;
short error;
};
struct copy_mref_aspect {
GENERIC_ASPECT(mref);
struct copy_brick *brick;
int queue;
};
struct copy_brick {
MARS_BRICK(copy);
// parameters
loff_t copy_start;
loff_t copy_end; // stop working if == 0
int io_prio;
int append_mode; // 1 = passively, 2 = actively
bool verify_mode;
bool utilize_mode; // utilize already copied data
bool abort_mode; // abort on IO error (default is retry forever)
// readonly from outside
loff_t copy_last; // current working position
int copy_error;
bool low_dirty;
bool is_aborting;
// internal
bool trigger;
unsigned long clash;
atomic_t io_flight;
atomic_t copy_flight;
long long last_jiffies;
wait_queue_head_t event;
struct semaphore mutex;
struct task_struct *thread;
struct copy_state st[MAX_COPY_PARA];
};
struct copy_input {
MARS_INPUT(copy);
};
struct copy_output {
MARS_OUTPUT(copy);
};
MARS_TYPES(copy);
#endif