src/DiskIO/DiskThreads/DiskThreads.h

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /*
  10  * DiskThreads.h
  11  *
  12  * Internal declarations for the DiskThreads routines
  13  */
  14
  15 #ifndef __DISKTHREADS_H__
  16 #define __DISKTHREADS_H__
  17
  18 #include "dlink.h"
  19 #include "typedefs.h"
  20
  21 /* this non-standard-conformant include is needed in order to have stat(2) and struct stat
  22    properly defined on some systems (e.g. OpenBSD 5.4) */
  23 #if HAVE_SYS_STAT_H
  24 #include <sys/stat.h>
  25 #endif
  26
  27 #if AUFS_IO_THREADS
  28 #define NUMTHREADS AUFS_IO_THREADS
  29 #else
  30 #define NUMTHREADS (Config.cacheSwap.n_configured*16)
  31 #endif
  32
  33 /* Queue limit where swapouts are deferred (load calculation) */
  34 #define MAGIC1 (NUMTHREADS*Config.cacheSwap.n_configured*5)
  35 /* Queue limit where swapins are deferred (open/create fails) */
  36 #define MAGIC2 (NUMTHREADS*Config.cacheSwap.n_configured*20)
  37
  38 /* Which operations to run async */
  39 #define ASYNC_OPEN 1
  40 #define ASYNC_CLOSE 0
  41 #define ASYNC_CREATE 1
  42 #define ASYNC_WRITE 0
  43 #define ASYNC_READ 1
  44
  45 enum _squidaio_request_type {
  46     _AIO_OP_NONE = 0,
  47     _AIO_OP_OPEN,
  48     _AIO_OP_READ,
  49     _AIO_OP_WRITE,
  50     _AIO_OP_CLOSE,
  51     _AIO_OP_UNLINK,
  52     _AIO_OP_OPENDIR,
  53     _AIO_OP_STAT
  54 };
  55 typedef enum _squidaio_request_type squidaio_request_type;
  56
  57 typedef void AIOCB(int fd, void *cbdata, const char *buf, int aio_return, int aio_errno);
  58
  59 struct squidaio_result_t {
  60     int aio_return;
  61     int aio_errno;
  62     enum _squidaio_request_type result_type;
  63     void *_data;        /* Internal housekeeping */
  64     void *data;         /* Available to the caller */
  65 };
  66
  67 struct squidaio_ctrl_t {
  68
  69     struct squidaio_ctrl_t *next;
  70     int fd;
  71     int operation;
  72     AIOCB *done_handler;
  73     void *done_handler_data;
  74     squidaio_result_t result;
  75     int len;
  76     char *bufp;
  77     FREE *free_func;
  78     dlink_node node;
  79 };
  80
  81 void squidaio_init(void);
  82 void squidaio_shutdown(void);
  83 int squidaio_cancel(squidaio_result_t *);
  84 int squidaio_open(const char *, int, mode_t, squidaio_result_t *);
  85 int squidaio_read(int, char *, size_t, off_t, int, squidaio_result_t *);
  86 int squidaio_write(int, char *, size_t, off_t, int, squidaio_result_t *);
  87 int squidaio_close(int, squidaio_result_t *);
  88
  89 int squidaio_stat(const char *, struct stat *, squidaio_result_t *);
  90 int squidaio_unlink(const char *, squidaio_result_t *);
  91 int squidaio_opendir(const char *, squidaio_result_t *);
  92 squidaio_result_t *squidaio_poll_done(void);
  93 int squidaio_operations_pending(void);
  94 int squidaio_sync(void);
  95 int squidaio_get_queue_len(void);
  96 void *squidaio_xmalloc(int size);
  97 void squidaio_xfree(void *p, int size);
  98 void squidaio_stats(StoreEntry *);
  99
 100 void aioInit(void);
 101 void aioDone(void);
 102 void aioCancel(int);
 103 void aioOpen(const char *, int, mode_t, AIOCB *, void *);
 104 void aioClose(int);
 105 void aioWrite(int, off_t offset, char *, size_t size, AIOCB *, void *, FREE *);
 106 void aioRead(int, off_t offset, size_t size, AIOCB *, void *);
 107
 108 void aioStat(char *, struct stat *, AIOCB *, void *);
 109 void aioUnlink(const char *, AIOCB *, void *);
 110 int aioQueueSize(void);
 111
 112 #include "DiskIO/DiskFile.h"
 113
 114 class DiskThreadsIOStrategy;
 115
 116 struct AIOCounts {
 117     uint64_t open_start;
 118     uint64_t open_finish;
 119     uint64_t close_start;
 120     uint64_t close_finish;
 121     uint64_t cancel;
 122     uint64_t write_start;
 123     uint64_t write_finish;
 124     uint64_t read_start;
 125     uint64_t read_finish;
 126     uint64_t stat_start;
 127     uint64_t stat_finish;
 128     uint64_t unlink_start;
 129     uint64_t unlink_finish;
 130     uint64_t check_callback;
 131 };
 132
 133 extern AIOCounts squidaio_counts;
 134 extern dlink_list used_list;
 135
 136 #endif
 137