/*---------------------------------------------------------------------------*/
static struct file *
find_file(const char *name)
{
int i;
struct file_header hdr;
coffee_page_t page;
/* First check if the file metadata is cached. */
for(i = 0; i < COFFEE_MAX_OPEN_FILES; i++) {
if(FILE_FREE(&coffee_files[i])) {
continue;
}
read_header(&hdr, coffee_files[i].page);
if(HDR_ACTIVE(hdr) && !HDR_LOG(hdr) && strcmp(name, hdr.name) == 0) {
return &coffee_files[i];
}
}
/* Scan the flash memory sequentially otherwise. */
for(page = 0; page < COFFEE_PAGE_COUNT; page = next_file(page, &hdr)) {
read_header(&hdr, page);
if(HDR_ACTIVE(hdr) && !HDR_LOG(hdr) && strcmp(name, hdr.name) == 0) {
return load_file(page, &hdr);
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
int
cfs_readdir(struct cfs_dir *dir, struct cfs_dirent *record)
{
struct file_header hdr;
coffee_page_t page;
memcpy(&page, dir->dummy_space, sizeof(coffee_page_t));
while(page < COFFEE_PAGE_COUNT) {
read_header(&hdr, page);
if(HDR_ACTIVE(hdr) && !HDR_LOG(hdr)) {
coffee_page_t next_page;
memcpy(record->name, hdr.name, sizeof(record->name));
record->name[sizeof(record->name) - 1] = '\0';
record->size = file_end(page);
next_page = next_file(page, &hdr);
memcpy(dir->dummy_space, &next_page, sizeof(coffee_page_t));
return 0;
}
page = next_file(page, &hdr);
}
return -1;
}
/*---------------------------------------------------------------------------*/
static int
remove_by_page(coffee_page_t page, int remove_log, int close_fds)
{
struct file_header hdr;
int i;
read_header(&hdr, page);
if(!HDR_ACTIVE(hdr)) {
return -1;
}
if(remove_log && HDR_MODIFIED(hdr)) {
if(remove_by_page(hdr.log_page, 0, 0) < 0) {
return -1;
}
}
hdr.flags |= HDR_FLAG_OBSOLETE;
write_header(&hdr, page);
*gc_wait = 0;
/* Close all file descriptors that reference the removed file. */
if(close_fds) {
for(i = 0; i < COFFEE_FD_SET_SIZE; i++) {
if(coffee_fd_set[i].file != NULL && coffee_fd_set[i].file->page == page) {
coffee_fd_set[i].flags = COFFEE_FD_FREE;
}
}
}
for(i = 0; i < COFFEE_MAX_OPEN_FILES; i++) {
if(coffee_files[i].page == page) {
coffee_files[i].page = INVALID_PAGE;
coffee_files[i].references = 0;
coffee_files[i].max_pages = 0;
}
}
#if !COFFEE_CONF_EXTENDED_WEAR_LEVELLING
if(!HDR_LOG(hdr)) {
collect_garbage(GC_RELUCTANT);
}
#endif
return 0;
}
/*---------------------------------------------------------------------------*/
int
cfs_readdir(struct cfs_dir *dir, struct cfs_dirent *record)
{
struct file_header hdr;
coffee_page_t page;
for(page = *(coffee_page_t *)dir->dummy_space; page < COFFEE_PAGE_COUNT;) {
watchdog_periodic();
read_header(&hdr, page);
if(HDR_ACTIVE(hdr) && !HDR_LOG(hdr)) {
memcpy(record->name, hdr.name, sizeof(record->name));
record->name[sizeof(record->name) - 1] = '\0';
record->size = file_end(page);
*(coffee_page_t *)dir->dummy_space = next_file(page, &hdr);
return 0;
}
page = next_file(page, &hdr);
}
return -1;
}
