static int filemap_alloc(int fd, struct file **file_store)
{
struct file *file = get_filemap();
if (fd == NO_FD) {
for (fd = 0; fd < FS_STRUCT_NENTRY; fd++, file++) {
if (file->status == FD_NONE) {
goto found;
}
}
return -E_MAX_OPEN;
} else {
if (testfd(fd)) {
file += fd;
if (file->status == FD_NONE) {
goto found;
}
return -E_BUSY;
}
return -E_INVAL;
}
found:
assert(fopen_count(file) == 0);
file->status = FD_INIT, file->node = NULL;
*file_store = file;
return 0;
}
void filemap_release(struct file *file)
{
assert(file->status == FD_OPENED || file->status == FD_CLOSED);
assert(fopen_count(file) > 0);
if (fopen_count_dec(file) == 0) {
filemap_free(file);
}
}
static void filemap_free(struct file *file)
{
assert(file->status == FD_INIT || file->status == FD_CLOSED);
assert(fopen_count(file) == 0);
if (file->status == FD_CLOSED) {
vfs_close(file->node);
}
file->status = FD_NONE;
}
// fd_array_close - file's open_count--; if file's open_count-- == 0 , then call fd_array_free to free this file item
void
fd_array_close(struct file *file) {
assert(file->status == FD_OPENED);
assert(fopen_count(file) > 0);
file->status = FD_CLOSED;
if (fopen_count_dec(file) == 0) {
fd_array_free(file);
}
}
void filemap_release(struct file *file)
{
assert(fopen_count(file) > 0);
fopen_count_dec(file);
}
