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deep_flush_linux.c
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deep_flush_linux.c
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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2020-2023, Intel Corporation */
/*
* deep_flush_linux.c -- deep_flush functionality
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include "deep_flush.h"
#include "libpmem2.h"
#include "map.h"
#include "os.h"
#include "out.h"
#include "persist.h"
#include "pmem2_utils.h"
#include "region_namespace.h"
#include "alloc.h"
/*
* pmem2_deep_flush_write -- perform write to deep_flush file
* on given region_id
*/
int
pmem2_deep_flush_write(unsigned region_id)
{
LOG(3, "region_id %d", region_id);
int ret = 0;
char *deep_flush_path = NULL;
int deep_flush_fd = -1;
char rbuf[2];
deep_flush_path = Malloc(PATH_MAX);
if (deep_flush_path == NULL) {
ERR("!Malloc");
ret = -1;
goto end;
}
if (util_snprintf(deep_flush_path, PATH_MAX,
"/sys/bus/nd/devices/region%u/deep_flush", region_id) < 0) {
ERR("!snprintf");
ret = PMEM2_E_ERRNO;
goto end;
}
if ((deep_flush_fd = os_open(deep_flush_path, O_RDONLY)) < 0) {
LOG(1, "!os_open(\"%s\", O_RDONLY)", deep_flush_path);
goto end;
}
if (read(deep_flush_fd, rbuf, sizeof(rbuf)) != 2) {
LOG(1, "!read(%d)", deep_flush_fd);
goto end;
}
if (rbuf[0] == '0' && rbuf[1] == '\n') {
LOG(3, "Deep flushing not needed");
goto end;
}
os_close(deep_flush_fd);
deep_flush_fd = -1;
if ((deep_flush_fd = os_open(deep_flush_path, O_WRONLY)) < 0) {
LOG(1, "Cannot open deep_flush file %s to write",
deep_flush_path);
goto end;
}
if (write(deep_flush_fd, "1", 1) != 1) {
LOG(1, "Cannot write to deep_flush file %d", deep_flush_fd);
goto end;
}
end:
if (deep_flush_fd > -1)
os_close(deep_flush_fd);
if (deep_flush_path)
Free(deep_flush_path);
return ret;
}
/*
* pmem2_deep_flush_dax -- reads file type for map and check
* if it is device dax or reg file, depend on file type
* performs proper flush operation
*/
int
pmem2_deep_flush_dax(struct pmem2_map *map, void *ptr, size_t size)
{
int ret;
enum pmem2_file_type type = map->source.value.ftype;
if (type == PMEM2_FTYPE_REG) {
/*
* Flushing using OS-provided mechanisms requires that
* the address be a multiple of the page size.
* Align address down and change len so that [addr, addr + len)
* still contains the initial range.
*/
/* round address down to page boundary */
uintptr_t new_addr = ALIGN_DOWN((uintptr_t)ptr, Pagesize);
/* increase len by the amount we gain when we round addr down */
size += (uintptr_t)ptr - new_addr;
ptr = (void *)new_addr;
ret = pmem2_flush_file_buffers_os(map, ptr, size, 0);
if (ret) {
LOG(1, "cannot flush buffers addr %p len %zu",
ptr, size);
return ret;
}
} else if (type == PMEM2_FTYPE_DEVDAX) {
unsigned region_id;
int ret = pmem2_get_region_id(&map->source, ®ion_id);
if (ret < 0) {
LOG(1, "cannot find region id for dev %lu",
map->source.value.st_rdev);
return ret;
}
ret = pmem2_deep_flush_write(region_id);
if (ret) {
LOG(1, "cannot write to deep_flush file for region %d",
region_id);
return ret;
}
} else {
ASSERT(0);
}
return 0;
}