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/*
* Block device emulated on standard files
*
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "emubd/lfs_emubd.h"
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include <sys/stat.h>
#include <unistd.h>
#include <assert.h>
#include <stdbool.h>
#include <inttypes.h>
// Emulated block device utils
static inline void lfs_emubd_tole32(lfs_emubd_t *emu) {
emu->cfg.read_size = lfs_tole32(emu->cfg.read_size);
emu->cfg.prog_size = lfs_tole32(emu->cfg.prog_size);
emu->cfg.block_size = lfs_tole32(emu->cfg.block_size);
emu->cfg.block_count = lfs_tole32(emu->cfg.block_count);
emu->stats.read_count = lfs_tole32(emu->stats.read_count);
emu->stats.prog_count = lfs_tole32(emu->stats.prog_count);
emu->stats.erase_count = lfs_tole32(emu->stats.erase_count);
for (unsigned i = 0; i < sizeof(emu->history.blocks) /
sizeof(emu->history.blocks[0]); i++) {
emu->history.blocks[i] = lfs_tole32(emu->history.blocks[i]);
}
}
static inline void lfs_emubd_fromle32(lfs_emubd_t *emu) {
emu->cfg.read_size = lfs_fromle32(emu->cfg.read_size);
emu->cfg.prog_size = lfs_fromle32(emu->cfg.prog_size);
emu->cfg.block_size = lfs_fromle32(emu->cfg.block_size);
emu->cfg.block_count = lfs_fromle32(emu->cfg.block_count);
emu->stats.read_count = lfs_fromle32(emu->stats.read_count);
emu->stats.prog_count = lfs_fromle32(emu->stats.prog_count);
emu->stats.erase_count = lfs_fromle32(emu->stats.erase_count);
for (unsigned i = 0; i < sizeof(emu->history.blocks) /
sizeof(emu->history.blocks[0]); i++) {
emu->history.blocks[i] = lfs_fromle32(emu->history.blocks[i]);
}
}
// Block device emulated on existing filesystem
int lfs_emubd_create(const struct lfs_config *cfg, const char *path) {
LFS_TRACE("lfs_emubd_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);
lfs_emubd_t *emu = cfg->context;
emu->cfg.read_size = cfg->read_size;
emu->cfg.prog_size = cfg->prog_size;
emu->cfg.block_size = cfg->block_size;
emu->cfg.block_count = cfg->block_count;
// Allocate buffer for creating children files
size_t pathlen = strlen(path);
emu->path = malloc(pathlen + 1 + LFS_NAME_MAX + 1);
if (!emu->path) {
int err = -ENOMEM;
LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
return err;
}
strcpy(emu->path, path);
emu->path[pathlen] = '/';
emu->child = &emu->path[pathlen+1];
memset(emu->child, '\0', LFS_NAME_MAX+1);
// Create directory if it doesn't exist
int err = mkdir(path, 0777);
if (err && errno != EEXIST) {
err = -errno;
LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
return err;
}
// Load stats to continue incrementing
snprintf(emu->child, LFS_NAME_MAX, ".stats");
FILE *f = fopen(emu->path, "r");
if (!f) {
memset(&emu->stats, LFS_EMUBD_ERASE_VALUE, sizeof(emu->stats));
} else {
size_t res = fread(&emu->stats, sizeof(emu->stats), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
err = -errno;
LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
return err;
}
err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
return err;
}
}
// Load history
snprintf(emu->child, LFS_NAME_MAX, ".history");
f = fopen(emu->path, "r");
if (!f) {
memset(&emu->history, 0, sizeof(emu->history));
} else {
size_t res = fread(&emu->history, sizeof(emu->history), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
err = -errno;
LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
return err;
}
err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_create -> %"PRId32, err);
return err;
}
}
LFS_TRACE("lfs_emubd_create -> %"PRId32, 0);
return 0;
}
void lfs_emubd_destroy(const struct lfs_config *cfg) {
LFS_TRACE("lfs_emubd_destroy(%p)", (void*)cfg);
lfs_emubd_sync(cfg);
lfs_emubd_t *emu = cfg->context;
free(emu->path);
LFS_TRACE("lfs_emubd_destroy -> %s", "void");
}
int lfs_emubd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, void *buffer, lfs_size_t size) {
LFS_TRACE("lfs_emubd_read(%p, 0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
(void*)cfg, block, off, buffer, size);
lfs_emubd_t *emu = cfg->context;
uint8_t *data = buffer;
// Check if read is valid
assert(off % cfg->read_size == 0);
assert(size % cfg->read_size == 0);
assert(block < cfg->block_count);
// Zero out buffer for debugging
memset(data, 0, size);
// Read data
snprintf(emu->child, LFS_NAME_MAX, "%" PRIx32, block);
FILE *f = fopen(emu->path, "rb");
if (!f && errno != ENOENT) {
int err = -errno;
LFS_TRACE("lfs_emubd_read -> %d", err);
return err;
}
if (f) {
int err = fseek(f, off, SEEK_SET);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_read -> %d", err);
return err;
}
size_t res = fread(data, 1, size, f);
if (res < size && !feof(f)) {
err = -errno;
LFS_TRACE("lfs_emubd_read -> %d", err);
return err;
}
err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_read -> %d", err);
return err;
}
}
emu->stats.read_count += size;
LFS_TRACE("lfs_emubd_read -> %d", 0);
return 0;
}
int lfs_emubd_prog(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, const void *buffer, lfs_size_t size) {
LFS_TRACE("lfs_emubd_prog(%p, 0x%"PRIx32", %"PRIu32", %p, %"PRIu32")",
(void*)cfg, block, off, buffer, size);
lfs_emubd_t *emu = cfg->context;
const uint8_t *data = buffer;
// Check if write is valid
assert(off % cfg->prog_size == 0);
assert(size % cfg->prog_size == 0);
assert(block < cfg->block_count);
// Program data
snprintf(emu->child, LFS_NAME_MAX, "%" PRIx32, block);
FILE *f = fopen(emu->path, "r+b");
if (!f) {
int err = (errno == EACCES) ? 0 : -errno;
LFS_TRACE("lfs_emubd_prog -> %d", err);
return err;
}
// Check that file was erased
assert(f);
int err = fseek(f, off, SEEK_SET);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_prog -> %d", err);
return err;
}
size_t res = fwrite(data, 1, size, f);
if (res < size) {
err = -errno;
LFS_TRACE("lfs_emubd_prog -> %d", err);
return err;
}
err = fseek(f, off, SEEK_SET);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_prog -> %d", err);
return err;
}
uint8_t dat;
res = fread(&dat, 1, 1, f);
if (res < 1) {
err = -errno;
LFS_TRACE("lfs_emubd_prog -> %d", err);
return err;
}
err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_prog -> %d", err);
return err;
}
// update history and stats
if (block != emu->history.blocks[0]) {
memmove(&emu->history.blocks[1], &emu->history.blocks[0],
sizeof(emu->history) - sizeof(emu->history.blocks[0]));
emu->history.blocks[0] = block;
}
emu->stats.prog_count += size;
LFS_TRACE("lfs_emubd_prog -> %d", 0);
return 0;
}
int lfs_emubd_erase(const struct lfs_config *cfg, lfs_block_t block) {
LFS_TRACE("lfs_emubd_erase(%p, 0x%"PRIx32")", (void*)cfg, block);
lfs_emubd_t *emu = cfg->context;
// Check if erase is valid
assert(block < cfg->block_count);
// Erase the block
snprintf(emu->child, LFS_NAME_MAX, "%" PRIx32, block);
struct stat st;
int err = stat(emu->path, &st);
if (err && errno != ENOENT) {
err = -errno;
LFS_TRACE("lfs_emubd_erase -> %d", err);
return err;
}
if (!err && S_ISREG(st.st_mode) && (S_IWUSR & st.st_mode)) {
err = unlink(emu->path);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_erase -> %d", err);
return err;
}
}
if (err || (S_ISREG(st.st_mode) && (S_IWUSR & st.st_mode))) {
FILE *f = fopen(emu->path, "w");
if (!f) {
err = -errno;
LFS_TRACE("lfs_emubd_erase -> %d", err);
return err;
}
err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_erase -> %d", err);
return err;
}
}
emu->stats.erase_count += cfg->block_size;
LFS_TRACE("lfs_emubd_erase -> %d", 0);
return 0;
}
int lfs_emubd_sync(const struct lfs_config *cfg) {
LFS_TRACE("lfs_emubd_sync(%p)", (void*)cfg);
lfs_emubd_t *emu = cfg->context;
// Just write out info/stats for later lookup
snprintf(emu->child, LFS_NAME_MAX, ".config");
FILE *f = fopen(emu->path, "w");
if (!f) {
int err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
lfs_emubd_tole32(emu);
size_t res = fwrite(&emu->cfg, sizeof(emu->cfg), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
int err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
int err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
snprintf(emu->child, LFS_NAME_MAX, ".stats");
f = fopen(emu->path, "w");
if (!f) {
err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
lfs_emubd_tole32(emu);
res = fwrite(&emu->stats, sizeof(emu->stats), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
snprintf(emu->child, LFS_NAME_MAX, ".history");
f = fopen(emu->path, "w");
if (!f) {
err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
lfs_emubd_tole32(emu);
res = fwrite(&emu->history, sizeof(emu->history), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
err = fclose(f);
if (err) {
err = -errno;
LFS_TRACE("lfs_emubd_sync -> %d", err);
return err;
}
LFS_TRACE("lfs_emubd_sync -> %d", 0);
return 0;
}
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