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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "storage.h"
#include <assert.h>
#include <stdio.h>
#include "commonlib/bsd/compiler.h"
#include "fmap.h"
#include "fv.h"
#include "utils.h"
bool storage_open(const char store_file[], struct storage_t *storage, bool rw)
{
storage->rw = rw;
storage->file = map_file(store_file, rw);
if (storage->file.start == NULL) {
fprintf(stderr, "Failed to load smm-store-file \"%s\"\n",
store_file);
return false;
}
/* If we won't find FMAP with SMMSTORE, use the whole file, but fail if
* FMAP is there without SMMSTORE. */
storage->region = storage->file;
long fmap_offset = fmap_find(storage->file.start, storage->file.length);
if (fmap_offset >= 0) {
struct fmap *fmap = (void *)(storage->file.start + fmap_offset);
const struct fmap_area *area = fmap_find_area(fmap, "SMMSTORE");
if (area == NULL) {
fprintf(stderr,
"Found FMAP without SMMSTORE in \"%s\"\n",
store_file);
return false;
}
storage->region.start += area->offset;
storage->region.length = area->size;
}
bool auth_vars;
if (!fv_parse(storage->region, &storage->store_area, &auth_vars)) {
if (!rw) {
fprintf(stderr,
"Failed to find variable store in \"%s\"\n",
store_file);
goto error;
}
if (!fv_init(storage->region)) {
fprintf(stderr,
"Failed to create variable store in \"%s\"\n",
store_file);
goto error;
}
if (!fv_parse(storage->region, &storage->store_area, &auth_vars)) {
fprintf(stderr,
"Failed to parse newly formatted store in \"%s\"\n",
store_file);
goto error;
}
fprintf(stderr,
"Successfully created variable store in \"%s\"\n",
store_file);
}
storage->vs = vs_load(storage->store_area, auth_vars);
return true;
error:
unmap_file(storage->file);
return false;
}
bool storage_write_back(struct storage_t *storage)
{
assert(storage->rw && "Only RW storage can be updated.");
bool success = vs_store(&storage->vs, storage->store_area);
if (!success)
fprintf(stderr, "Failed to update variable store\n");
storage_drop(storage);
return success;
}
void storage_drop(struct storage_t *storage)
{
unmap_file(storage->file);
vs_free(&storage->vs);
}
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