jbd2: add lockdep support

Ported from similar patch for the jbd layer.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 11 insertions, 0 deletions

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index f30802aeefae..70b3199e69dc 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -241,6 +241,8 @@ out:
         return ret;
 }
 
+static struct lock_class_key jbd2_handle_key;
+
 /* Allocate a new handle.  This should probably be in a slab... */
 static handle_t *new_handle(int nblocks)
 {
@@ -251,6 +253,9 @@ static handle_t *new_handle(int nblocks)
         handle->h_buffer_credits = nblocks;
         handle->h_ref = 1;
 
+        lockdep_init_map(&handle->h_lockdep_map, "jbd2_handle",
+                                                &jbd2_handle_key, 0);
+
         return handle;
 }
 
@@ -293,7 +298,11 @@ handle_t *jbd2_journal_start(journal_t *journal, int nblocks)
                 jbd2_free_handle(handle);
                 current->journal_info = NULL;
                 handle = ERR_PTR(err);
+                goto out;
         }
+
+        lock_acquire(&handle->h_lockdep_map, 0, 0, 0, 2, _THIS_IP_);
+out:
         return handle;
 }
 
@@ -1419,6 +1428,8 @@ int jbd2_journal_stop(handle_t *handle)
                 spin_unlock(&journal->j_state_lock);
         }
 
+        lock_release(&handle->h_lockdep_map, 1, _THIS_IP_);
+
         jbd2_free_handle(handle);
         return err;
 }