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Subject[PATCH 46/49] jbd2: add lockdep support
Date
From: Mingming Cao <cmm@us.ibm.com>

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>
---
fs/jbd2/transaction.c | 11 +++++++++++
include/linux/jbd2.h | 4 ++++
2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index f30802a..70b3199 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;
}
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index a2645c2..f982d38 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -418,6 +418,10 @@ struct handle_s
unsigned int h_sync: 1; /* sync-on-close */
unsigned int h_jdata: 1; /* force data journaling */
unsigned int h_aborted: 1; /* fatal error on handle */
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ struct lockdep_map h_lockdep_map;
+#endif
};


--
1.5.4.rc3.31.g1271-dirty


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