On Fri, 2007-07-13 at 02:05 -0700, Andrew Morton wrote:
> Except lockdep doesn't know about journal_start(), which has ranking
> requirements similar to a semaphore.
Something like so?
Or can journal_stop() be done by a different task than the one that did
journal_start()? - in which case nothing much can be done :-/
This seems to boot... albeit I did not push it hard.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
fs/jbd/transaction.c | 9 +++++++++
include/linux/jbd.h | 5 +++++
2 files changed, 14 insertions(+)
Index: linux-2.6/fs/jbd/transaction.c
===================================================================
--- linux-2.6.orig/fs/jbd/transaction.c
+++ linux-2.6/fs/jbd/transaction.c
@@ -233,6 +233,8 @@ out:
return ret;
}
+static struct lock_class_key jbd_handle_key;
+
/* Allocate a new handle. This should probably be in a slab... */
static handle_t *new_handle(int nblocks)
{
@@ -243,6 +245,8 @@ static handle_t *new_handle(int nblocks)
handle->h_buffer_credits = nblocks;
handle->h_ref = 1;
+ lockdep_init_map(&handle->h_lockdep_map, "jbd_handle", &jbd_handle_key, 0);
+
return handle;
}
@@ -286,6 +290,9 @@ handle_t *journal_start(journal_t *journ
current->journal_info = NULL;
handle = ERR_PTR(err);
}
+
+ lock_acquire(&handle->h_lockdep_map, 0, 0, 0, 2, _THIS_IP_);
+
return handle;
}
@@ -1411,6 +1418,8 @@ int journal_stop(handle_t *handle)
spin_unlock(&journal->j_state_lock);
}
+ lock_release(&handle->h_lockdep_map, 1, _THIS_IP_);
+
jbd_free_handle(handle);
return err;
}
Index: linux-2.6/include/linux/jbd.h
===================================================================
--- linux-2.6.orig/include/linux/jbd.h
+++ linux-2.6/include/linux/jbd.h
@@ -30,6 +30,7 @@
#include <linux/bit_spinlock.h>
#include <linux/mutex.h>
#include <linux/timer.h>
+#include <linux/lockdep.h>
#include <asm/semaphore.h>
#endif
@@ -405,6 +406,10 @@ 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_LOCKDEP
+ struct lockdep_map h_lockdep_map;
+#endif
};
-
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