retry:
if (rw == READ && ext4_should_dioread_nolock(inode)) {
- if (unlikely(!list_empty(&ei->i_completed_io_list))) {
+ if (unlikely(atomic_read(&EXT4_I(inode)->i_unwritten))) {
mutex_lock(&inode->i_mutex);
- ext4_flush_completed_IO(inode);
+ ext4_flush_unwritten_io(inode);
mutex_unlock(&inode->i_mutex);
}
+ /*
+ * Nolock dioread optimization may be dynamically disabled
+ * via ext4_inode_block_unlocked_dio(). Check inode's state
+ * while holding extra i_dio_count ref.
+ */
+ atomic_inc(&inode->i_dio_count);
+ smp_mb();
+ if (unlikely(ext4_test_inode_state(inode,
+ EXT4_STATE_DIOREAD_LOCK))) {
+ inode_dio_done(inode);
+ goto locked;
+ }
ret = __blockdev_direct_IO(rw, iocb, inode,
inode->i_sb->s_bdev, iov,
offset, nr_segs,
ext4_get_block, NULL, NULL, 0);
+ inode_dio_done(inode);
} else {
+locked:
ret = blockdev_direct_IO(rw, iocb, inode, iov,
offset, nr_segs, ext4_get_block);