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 }; - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html