forked from Imagelibrary/rtems
86ef0df976
The fat_file_datasync() read every cluster of the file into the cache and then synchronized it step-by-step. For unmodified buffers this is a non-operation. For modified buffers this will wake-up the swapout task which performs then a single buffer write operation. This is usually quite inefficient. Firstly we do single buffer writes, secondly we may perform a lot of unnecessary read operations (for huge files this is really bad), and thirdly this leads likely to cache evictions. The synchronization procedure is replaced by a simple rtems_bdbuf_sync_dev(). This has the side-effect that also buffers not related to the file are synchronized, but since the modified list is normally short this should be acceptable.
172 lines
3.4 KiB
C
172 lines
3.4 KiB
C
/*
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* Copyright (c) 2012 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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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 "tmacros.h"
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#include <sys/stat.h>
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#include <errno.h>
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#include <string.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <rtems/libio.h>
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#include <rtems/blkdev.h>
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#include <rtems/dosfs.h>
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#include <rtems/ramdisk.h>
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static void create_file(const char *file)
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{
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int fd;
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int rv;
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fd = creat(file, S_IRWXU | S_IRWXG | S_IRWXO);
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rtems_test_assert(fd >= 0);
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rv = fsync(fd);
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rtems_test_assert(rv == 0);
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rv = close(fd);
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rtems_test_assert(rv == 0);
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}
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static void write_to_file(const char *file, bool sync)
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{
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int fd;
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char buf [1];
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ssize_t n;
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off_t pos;
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int rv;
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fd = open(file, O_RDWR);
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rtems_test_assert(fd >= 0);
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n = write(fd, buf, sizeof(buf));
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rtems_test_assert(n == (ssize_t) sizeof(buf));
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pos = lseek(fd, 0, SEEK_END);
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rtems_test_assert(pos == sizeof(buf));
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if (sync) {
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rv = fsync(fd);
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rtems_test_assert(rv == 0);
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}
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rv = close(fd);
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rtems_test_assert(rv == 0);
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}
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static void check_file_size(const char *file, off_t size)
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{
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int fd;
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off_t pos;
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int rv;
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fd = open(file, O_RDWR);
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rtems_test_assert(fd >= 0);
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pos = lseek(fd, 0, SEEK_END);
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rtems_test_assert(pos == size);
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rv = close(fd);
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rtems_test_assert(rv == 0);
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}
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static void test(const char *rda, const char *mnt, const char *file)
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{
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rtems_status_code sc;
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int disk_fd;
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int rv;
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sc = rtems_disk_io_initialize();
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rtems_test_assert(sc == RTEMS_SUCCESSFUL);
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disk_fd = open(rda, O_RDWR);
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rtems_test_assert(disk_fd >= 0);
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rv = msdos_format(rda, NULL);
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rtems_test_assert(rv == 0);
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rv = mount_and_make_target_path(
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rda,
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mnt,
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RTEMS_FILESYSTEM_TYPE_DOSFS,
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RTEMS_FILESYSTEM_READ_WRITE,
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NULL
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);
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rtems_test_assert(rv == 0);
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create_file(file);
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rv = rtems_disk_fd_purge(disk_fd);
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rtems_test_assert(rv == 0);
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write_to_file(file, false);
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rv = rtems_disk_fd_purge(disk_fd);
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rtems_test_assert(rv == 0);
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check_file_size(file, 0);
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write_to_file(file, true);
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rv = rtems_disk_fd_purge(disk_fd);
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rtems_test_assert(rv == 0);
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check_file_size(file, 1);
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rv = unmount(mnt);
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rtems_test_assert(rv == 0);
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rv = close(disk_fd);
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rtems_test_assert(rv == 0);
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}
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static void Init(rtems_task_argument arg)
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{
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puts("\n\n*** TEST FSDOSFSSYNC 1 ***");
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test("/dev/rda", "/mnt", "/mnt/file");
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puts("*** END OF TEST FSDOSFSSYNC 1 ***");
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rtems_test_exit(0);
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}
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rtems_ramdisk_config rtems_ramdisk_configuration [] = {
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{ .block_size = 512, .block_num = 1024 }
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};
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size_t rtems_ramdisk_configuration_size = 1;
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#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
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#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
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#define CONFIGURE_APPLICATION_EXTRA_DRIVERS RAMDISK_DRIVER_TABLE_ENTRY
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#define CONFIGURE_APPLICATION_NEEDS_LIBBLOCK
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#define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS 6
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#define CONFIGURE_USE_IMFS_AS_BASE_FILESYSTEM
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#define CONFIGURE_FILESYSTEM_DOSFS
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#define CONFIGURE_MAXIMUM_TASKS 2
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#define CONFIGURE_EXTRA_TASK_STACKS (8 * 1024)
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#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
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#define CONFIGURE_INIT
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#include <rtems/confdefs.h>
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