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/*
* Block device emulated in a file
*
* Copyright (c) 2022, The littlefs authors.
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "bd/lfs_filebd.h"
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#ifdef _WIN32
#include <windows.h>
#endif
int lfs_filebd_createcfg(const struct lfs_config *cfg, const char *path,
const struct lfs_filebd_config *bdcfg) {
LFS_FILEBD_TRACE("lfs_filebd_createcfg(%p {.context=%p, "
".read=%p, .prog=%p, .erase=%p, .sync=%p, "
".read_size=%"PRIu32", .prog_size=%"PRIu32", "
".block_size=%"PRIu32", .block_count=%"PRIu32"}, "
"\"%s\", "
"%p {.erase_value=%"PRId32"})",
(void*)cfg, cfg->context,
(void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
(void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
path, (void*)bdcfg, bdcfg->erase_value);
lfs_filebd_t *bd = cfg->context;
bd->cfg = bdcfg;
// open file
#ifdef _WIN32
bd->fd = open(path, O_RDWR | O_CREAT | O_BINARY, 0666);
#else
bd->fd = open(path, O_RDWR | O_CREAT, 0666);
#endif
if (bd->fd < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_createcfg -> %d", err);
return err;
}
LFS_FILEBD_TRACE("lfs_filebd_createcfg -> %d", 0);
return 0;
}
int lfs_filebd_create(const struct lfs_config *cfg, const char *path) {
LFS_FILEBD_TRACE("lfs_filebd_create(%p {.context=%p, "
".read=%p, .prog=%p, .erase=%p, .sync=%p, "
".read_size=%"PRIu32", .prog_size=%"PRIu32", "
".block_size=%"PRIu32", .block_count=%"PRIu32"}, "
"\"%s\")",
(void*)cfg, cfg->context,
(void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
(void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
path);
static const struct lfs_filebd_config defaults = {.erase_value=-1};
int err = lfs_filebd_createcfg(cfg, path, &defaults);
LFS_FILEBD_TRACE("lfs_filebd_create -> %d", err);
return err;
}
int lfs_filebd_destroy(const struct lfs_config *cfg) {
LFS_FILEBD_TRACE("lfs_filebd_destroy(%p)", (void*)cfg);
lfs_filebd_t *bd = cfg->context;
int err = close(bd->fd);
if (err < 0) {
err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_destroy -> %d", err);
return err;
}
LFS_FILEBD_TRACE("lfs_filebd_destroy -> %d", 0);
return 0;
}
int lfs_filebd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, void *buffer, lfs_size_t size) {
LFS_FILEBD_TRACE("lfs_filebd_read(%p, "
"0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
(void*)cfg, block, off, buffer, size);
lfs_filebd_t *bd = cfg->context;
// check if read is valid
LFS_ASSERT(off % cfg->read_size == 0);
LFS_ASSERT(size % cfg->read_size == 0);
LFS_ASSERT(block < cfg->block_count);
// zero for reproducibility (in case file is truncated)
if (bd->cfg->erase_value != -1) {
memset(buffer, bd->cfg->erase_value, size);
}
// read
off_t res1 = lseek(bd->fd,
(off_t)block*cfg->block_size + (off_t)off, SEEK_SET);
if (res1 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_read -> %d", err);
return err;
}
ssize_t res2 = read(bd->fd, buffer, size);
if (res2 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_read -> %d", err);
return err;
}
LFS_FILEBD_TRACE("lfs_filebd_read -> %d", 0);
return 0;
}
int lfs_filebd_prog(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, const void *buffer, lfs_size_t size) {
LFS_FILEBD_TRACE("lfs_filebd_prog(%p, 0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
(void*)cfg, block, off, buffer, size);
lfs_filebd_t *bd = cfg->context;
// check if write is valid
LFS_ASSERT(off % cfg->prog_size == 0);
LFS_ASSERT(size % cfg->prog_size == 0);
LFS_ASSERT(block < cfg->block_count);
// check that data was erased? only needed for testing
if (bd->cfg->erase_value != -1) {
off_t res1 = lseek(bd->fd,
(off_t)block*cfg->block_size + (off_t)off, SEEK_SET);
if (res1 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_prog -> %d", err);
return err;
}
for (lfs_off_t i = 0; i < size; i++) {
uint8_t c;
ssize_t res2 = read(bd->fd, &c, 1);
if (res2 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_prog -> %d", err);
return err;
}
LFS_ASSERT(c == bd->cfg->erase_value);
}
}
// program data
off_t res1 = lseek(bd->fd,
(off_t)block*cfg->block_size + (off_t)off, SEEK_SET);
if (res1 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_prog -> %d", err);
return err;
}
ssize_t res2 = write(bd->fd, buffer, size);
if (res2 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_prog -> %d", err);
return err;
}
LFS_FILEBD_TRACE("lfs_filebd_prog -> %d", 0);
return 0;
}
int lfs_filebd_erase(const struct lfs_config *cfg, lfs_block_t block) {
LFS_FILEBD_TRACE("lfs_filebd_erase(%p, 0x%"PRIx32")", (void*)cfg, block);
lfs_filebd_t *bd = cfg->context;
// check if erase is valid
LFS_ASSERT(block < cfg->block_count);
// erase, only needed for testing
if (bd->cfg->erase_value != -1) {
off_t res1 = lseek(bd->fd, (off_t)block*cfg->block_size, SEEK_SET);
if (res1 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_erase -> %d", err);
return err;
}
for (lfs_off_t i = 0; i < cfg->block_size; i++) {
ssize_t res2 = write(bd->fd, &(uint8_t){bd->cfg->erase_value}, 1);
if (res2 < 0) {
int err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_erase -> %d", err);
return err;
}
}
}
LFS_FILEBD_TRACE("lfs_filebd_erase -> %d", 0);
return 0;
}
int lfs_filebd_sync(const struct lfs_config *cfg) {
LFS_FILEBD_TRACE("lfs_filebd_sync(%p)", (void*)cfg);
// file sync
lfs_filebd_t *bd = cfg->context;
#ifdef _WIN32
int err = FlushFileBuffers((HANDLE) _get_osfhandle(fd)) ? 0 : -1;
#else
int err = fsync(bd->fd);
#endif
if (err) {
err = -errno;
LFS_FILEBD_TRACE("lfs_filebd_sync -> %d", 0);
return err;
}
LFS_FILEBD_TRACE("lfs_filebd_sync -> %d", 0);
return 0;
}
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