On Tue, 2008-01-15 at 15:59 -0800, Andrew Morton wrote:

On Wed, 16 Jan 2008 00:39:26 +0100
Jonas Bonn [off-list ref] wrote:

quoted

This likely fixes the oops in __lock_acquire reported as:

http://www.kerneloops.org/raw.php?rawid=2753&msgid=
http://www.kerneloops.org/raw.php?rawid=2749&msgid=

In these reported oopses, start_this_handle is returning -EROFS.

Signed-off-by: Jonas Bonn <redacted>
---
 fs/jbd/transaction.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 08ff6c7..038ed74 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c

@@ -288,10 +288,12 @@ handle_t *journal_start(journal_t *journal, int nblocks)
 		jbd_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;
 }

Yeah, thanks.

It looks like we forgot to port this lockdep support into ext4.  This is
bad.  What else got lost?

Here is the ext4/jbd2 port of the original lockdep patch with the above
fix. Please let me know if I missed anything.

It's likely there are other jbd/ext3 changes missed out in ext4/jbd2. I
will take a look at the git tree and do a cleanup.


Thanks for pointing this out.

---------------------------------------------------------
jbd2: lockdep support for jbd2

Except lockdep doesn't know about journal_start(), which has ranking
requirements similar to a semaphore.  

Ported from lockdep jbd patch.

Signed-off-by: Mingming Cao <redacted>
---
 fs/jbd2/transaction.c |   11 +++++++++++
 include/linux/jbd2.h  |    4 ++++
 2 files changed, 15 insertions(+)

Index: linux-2.6.24-rc7/fs/jbd2/transaction.c
===================================================================

--- linux-2.6.24-rc7.orig/fs/jbd2/transaction.c	2008-01-16 15:30:24.000000000 -0800
+++ linux-2.6.24-rc7/fs/jbd2/transaction.c	2008-01-16 15:41:14.000000000 -0800

@@ -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 *
 		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;
 }

Index: linux-2.6.24-rc7/include/linux/jbd2.h
===================================================================

--- linux-2.6.24-rc7.orig/include/linux/jbd2.h	2008-01-16 15:29:03.000000000 -0800
+++ linux-2.6.24-rc7/include/linux/jbd2.h	2008-01-16 15:29:54.000000000 -0800

@@ -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
 };