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