2018-05-08 14:08:29 +03:00
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/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=8:tabstop=8:
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*/
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/******************************************************************************\
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*
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* Implement of abstract I/O interface for MMAP.
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*
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\******************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h> /* IO operations */
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <assert.h>
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#include "ior.h"
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#include "aiori.h"
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#include "iordef.h"
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#include "utilities.h"
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/**************************** P R O T O T Y P E S *****************************/
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static void *MMAP_Create(char *, IOR_param_t *);
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static void *MMAP_Open(char *, IOR_param_t *);
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static IOR_offset_t MMAP_Xfer(int, void *, IOR_size_t *,
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IOR_offset_t, IOR_param_t *);
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static void MMAP_Close(void *, IOR_param_t *);
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static void MMAP_Fsync(void *, IOR_param_t *);
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/************************** D E C L A R A T I O N S ***************************/
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ior_aiori_t mmap_aiori = {
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.name = "MMAP",
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.create = MMAP_Create,
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.open = MMAP_Open,
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.xfer = MMAP_Xfer,
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.close = MMAP_Close,
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.delete = POSIX_Delete,
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2018-07-14 10:41:35 +03:00
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.get_version = aiori_get_version,
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2018-05-08 14:08:29 +03:00
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.fsync = MMAP_Fsync,
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.get_file_size = POSIX_GetFileSize,
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};
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/***************************** F U N C T I O N S ******************************/
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static void ior_mmap_file(int *file, IOR_param_t *param)
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{
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int flags = PROT_READ;
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IOR_offset_t size = param->expectedAggFileSize;
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if (param->open == WRITE)
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flags |= PROT_WRITE;
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param->mmap_ptr = mmap(NULL, size, flags, MAP_SHARED,
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*file, 0);
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if (param->mmap_ptr == MAP_FAILED)
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ERR("mmap() failed");
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if (param->randomOffset)
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flags = POSIX_MADV_RANDOM;
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else
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flags = POSIX_MADV_SEQUENTIAL;
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if (posix_madvise(param->mmap_ptr, size, flags) != 0)
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ERR("madvise() failed");
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if (posix_madvise(param->mmap_ptr, size, POSIX_MADV_DONTNEED) != 0)
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ERR("madvise() failed");
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return;
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}
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/*
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* Creat and open a file through the POSIX interface, then setup mmap.
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*/
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static void *MMAP_Create(char *testFileName, IOR_param_t * param)
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{
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int *fd;
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fd = POSIX_Create(testFileName, param);
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if (ftruncate(*fd, param->expectedAggFileSize) != 0)
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ERR("ftruncate() failed");
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ior_mmap_file(fd, param);
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return ((void *)fd);
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}
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/*
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* Open a file through the POSIX interface and setup mmap.
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*/
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static void *MMAP_Open(char *testFileName, IOR_param_t * param)
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{
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int *fd;
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fd = POSIX_Open(testFileName, param);
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ior_mmap_file(fd, param);
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return ((void *)fd);
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}
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/*
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* Write or read access to file using mmap
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*/
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static IOR_offset_t MMAP_Xfer(int access, void *file, IOR_size_t * buffer,
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IOR_offset_t length, IOR_param_t * param)
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{
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if (access == WRITE) {
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memcpy(param->mmap_ptr + param->offset, buffer, length);
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} else {
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memcpy(buffer, param->mmap_ptr + param->offset, length);
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}
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if (param->fsyncPerWrite == TRUE) {
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if (msync(param->mmap_ptr + param->offset, length, MS_SYNC) != 0)
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ERR("msync() failed");
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if (posix_madvise(param->mmap_ptr + param->offset, length,
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POSIX_MADV_DONTNEED) != 0)
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ERR("madvise() failed");
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}
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return (length);
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}
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/*
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* Perform msync().
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*/
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static void MMAP_Fsync(void *fd, IOR_param_t * param)
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{
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if (msync(param->mmap_ptr, param->expectedAggFileSize, MS_SYNC) != 0)
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EWARN("msync() failed");
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}
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/*
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* Close a file through the POSIX interface, after tear down the mmap.
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*/
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static void MMAP_Close(void *fd, IOR_param_t * param)
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{
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if (munmap(param->mmap_ptr, param->expectedAggFileSize) != 0)
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ERR("munmap failed");
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param->mmap_ptr = NULL;
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POSIX_Close(fd, param);
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}
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