Function bcache_remove_file

src/blockcache.cc:1313–1347

remove file from filename dictionary MUST sure that there is no dirty block belongs to this FILE (or memory leak occurs)

// MUST sure that there is no dirty block belongs to this FILE
// (or memory leak occurs)
bool bcache_remove_file(struct filemgr *file)
{
    bool rv = false;
    struct fnamedic_item *fname_item;

    // Before proceeding with deletion, garbage collect zombie files
    _garbage_collect_zombie_fnames();
    fname_item = file->bcache;

    if (fname_item) {
        // acquire lock
        spin_lock(&bcache_lock);
        // file must be empty
        if (!_file_empty(fname_item)) {
            spin_unlock(&bcache_lock);
            DBG("Warning: failed to remove fnamedic_item instance for a file '%s' "
                "because the fnamedic_item instance is not empty!\n",
                file->filename);
            return rv;
        }

        // remove from fname dictionary hash table
        hash_remove(&fnamedic, &fname_item->hash_elem);
        spin_unlock(&bcache_lock);

        // We don't need to grab the file buffer cache's partition locks
        // at once because this function is only invoked when there are
        // no database handles that access the file.
        if (_fname_try_free(fname_item)) {
            _fname_free(fname_item); // no other callers accessing this file
            rv = true;
        } // else fnamedic_item is in use by _bcache_evict. Deletion delayed
    }
    return rv;
}

// flush and synchronize all dirty blocks of the FILE
// dirty blocks will be changed to clean blocks (not discarded)