ext4: add mutex_is_locked() assertion to ext4_truncate()
[ Added fixup from Lukáš Czerner which only checks the assertion when
the inode is not new and is not being freed. ]
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 49c80e4..56ebd66 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3788,6 +3788,13 @@
struct address_space *mapping = inode->i_mapping;
loff_t page_len;
+ /*
+ * There is a possibility that we're either freeing the inode
+ * or it completely new indode. In those cases we might not
+ * have i_mutex locked because it's not necessary.
+ */
+ if (!(inode->i_state & (I_NEW|I_FREEING)))
+ WARN_ON(!mutex_is_locked(&inode->i_mutex));
trace_ext4_truncate_enter(inode);
if (!ext4_can_truncate(inode))