src/DiskIO/DiskThreads/DiskThreads.h

   1 /*
   2  * DiskThreads.h
   3  *
   4  * Internal declarations for the DiskThreads routines
   5  */
   6
   7 #ifndef __DISKTHREADS_H__
   8 #define __DISKTHREADS_H__
   9
  10 #include "config.h"
  11 #include "dlink.h"
  12 #include "typedefs.h"
  13
  14 #if AUFS_IO_THREADS
  15 #define NUMTHREADS AUFS_IO_THREADS
  16 #else
  17 #define NUMTHREADS (Config.cacheSwap.n_configured*16)
  18 #endif
  19
  20 /* Queue limit where swapouts are deferred (load calculation) */
  21 #define MAGIC1 (NUMTHREADS*Config.cacheSwap.n_configured*5)
  22 /* Queue limit where swapins are deferred (open/create fails) */
  23 #define MAGIC2 (NUMTHREADS*Config.cacheSwap.n_configured*20)
  24
  25 /* Which operations to run async */
  26 #define ASYNC_OPEN 1
  27 #define ASYNC_CLOSE 0
  28 #define ASYNC_CREATE 1
  29 #define ASYNC_WRITE 0
  30 #define ASYNC_READ 1
  31
  32 enum _squidaio_request_type {
  33     _AIO_OP_NONE = 0,
  34     _AIO_OP_OPEN,
  35     _AIO_OP_READ,
  36     _AIO_OP_WRITE,
  37     _AIO_OP_CLOSE,
  38     _AIO_OP_UNLINK,
  39     _AIO_OP_OPENDIR,
  40     _AIO_OP_STAT
  41 };
  42 typedef enum _squidaio_request_type squidaio_request_type;
  43
  44 typedef void AIOCB(int fd, void *cbdata, const char *buf, int aio_return, int aio_errno);
  45
  46 struct squidaio_result_t {
  47     int aio_return;
  48     int aio_errno;
  49     enum _squidaio_request_type result_type;
  50     void *_data;                /* Internal housekeeping */
  51     void *data;                 /* Available to the caller */
  52 };
  53
  54 struct squidaio_ctrl_t {
  55
  56     struct squidaio_ctrl_t *next;
  57     int fd;
  58     int operation;
  59     AIOCB *done_handler;
  60     void *done_handler_data;
  61     squidaio_result_t result;
  62     int len;
  63     char *bufp;
  64     FREE *free_func;
  65     dlink_node node;
  66 };
  67
  68 void squidaio_init(void);
  69 void squidaio_shutdown(void);
  70 int squidaio_cancel(squidaio_result_t *);
  71 int squidaio_open(const char *, int, mode_t, squidaio_result_t *);
  72 int squidaio_read(int, char *, size_t, off_t, int, squidaio_result_t *);
  73 int squidaio_write(int, char *, size_t, off_t, int, squidaio_result_t *);
  74 int squidaio_close(int, squidaio_result_t *);
  75
  76 int squidaio_stat(const char *, struct stat *, squidaio_result_t *);
  77 int squidaio_unlink(const char *, squidaio_result_t *);
  78 int squidaio_opendir(const char *, squidaio_result_t *);
  79 squidaio_result_t *squidaio_poll_done(void);
  80 int squidaio_operations_pending(void);
  81 int squidaio_sync(void);
  82 int squidaio_get_queue_len(void);
  83 void *squidaio_xmalloc(int size);
  84 void squidaio_xfree(void *p, int size);
  85 void squidaio_stats(StoreEntry *);
  86
  87 void aioInit(void);
  88 void aioDone(void);
  89 void aioCancel(int);
  90 void aioOpen(const char *, int, mode_t, AIOCB *, void *);
  91 void aioClose(int);
  92 void aioWrite(int, off_t offset, char *, size_t size, AIOCB *, void *, FREE *);
  93 void aioRead(int, off_t offset, size_t size, AIOCB *, void *);
  94
  95 void aioStat(char *, struct stat *, AIOCB *, void *);
  96 void aioUnlink(const char *, AIOCB *, void *);
  97 int aioQueueSize(void);
  98
  99 #include "DiskIO/DiskFile.h"
 100
 101 class DiskThreadsIOStrategy;
 102
 103 struct AIOCounts {
 104     int open_start;
 105     int open_finish;
 106     int close_start;
 107     int close_finish;
 108     int cancel;
 109     int write_start;
 110     int write_finish;
 111     int read_start;
 112     int read_finish;
 113     int stat_start;
 114     int stat_finish;
 115     int unlink_start;
 116     int unlink_finish;
 117     int check_callback;
 118 };
 119
 120 extern AIOCounts squidaio_counts;
 121 extern dlink_list used_list;
 122
 123
 124 #endif