- if (dio->result < dio->size && (rw & WRITE)) {
- dio->waiter = current;
- should_wait = 1;
- }
- if (ret == 0)
- ret = dio->result;
- finished_one_bio(dio); /* This can free the dio */
- blk_run_address_space(inode->i_mapping);
- if (should_wait) {
- unsigned long flags;
- /*
- * Wait for already issued I/O to drain out and
- * release its references to user-space pages
- * before returning to fallback on buffered I/O
- */
-
- spin_lock_irqsave(&dio->bio_lock, flags);
- set_current_state(TASK_UNINTERRUPTIBLE);
- while (dio->bio_count) {
- spin_unlock_irqrestore(&dio->bio_lock, flags);
- io_schedule();
- spin_lock_irqsave(&dio->bio_lock, flags);
- set_current_state(TASK_UNINTERRUPTIBLE);
- }
- spin_unlock_irqrestore(&dio->bio_lock, flags);
- set_current_state(TASK_RUNNING);
- kfree(dio);
- }
- } else {
- ssize_t transferred = 0;
-
- finished_one_bio(dio);
- ret2 = dio_await_completion(dio);
- if (ret == 0)
- ret = ret2;
- if (ret == 0)
- ret = dio->page_errors;
- if (dio->result) {
- loff_t i_size = i_size_read(inode);
-
- transferred = dio->result;
- /*
- * Adjust the return value if the read crossed a
- * non-block-aligned EOF.
- */
- if (rw == READ && (offset + transferred > i_size))
- transferred = i_size - offset;
- }
- dio_complete(dio, offset, transferred);
- if (ret == 0)
- ret = transferred;