1 There will cause a deadlock if invoke ext4_truncate with i_mutex locked
2 in lustre. Since lustre has own lock to provide protect so we don't
3 need this check at all.
5 Index: linux-3.10.0-229.1.2.fc21.x86_64/fs/ext4/inode.c
6 ===================================================================
7 --- linux-3.10.0-229.1.2.fc21.x86_64.orig/fs/ext4/inode.c
8 +++ linux-3.10.0-229.1.2.fc21.x86_64/fs/ext4/inode.c
9 @@ -3644,8 +3644,6 @@ void ext4_truncate(struct inode *inode)
10 * or it completely new indode. In those cases we might not
11 * have i_mutex locked because it's not necessary.
13 - if (!(inode->i_state & (I_NEW|I_FREEING)))
14 - WARN_ON(!mutex_is_locked(&inode->i_mutex));
15 trace_ext4_truncate_enter(inode);
17 if (!ext4_can_truncate(inode))