[Ocfs2-devel] [PATCH] Wake up down-convert thread when clearing OCFS2_LOCK_UPCONVERT_FINISHING from ocfs2_lock_res.l_flags

[Sunil Mushran <sunil.mushran@oracle.com>]

Instead of passing osb, just wakeup_dc from the 5 locations.
Cleaner that-a-way.

On 09/13/2011 02:13 AM, Wengang Wang wrote:
> In down convert thread, when the ocfs2_lock_res is in OCFS2_LOCK_UPCONVERT_FINISHING
> state, it is requeued for next run of ocfs2_downconvert_thread_do_work(). If not
> waked up, the DC thread just sleep there without even there are ocfs2_lock_res' left
> in the list.
>
> So when clearing the OCFS2_LOCK_UPCONVERT_FINISHING flag, we need also to wake up dc
> thread accordingly.
>
> Signed-off-by: Wengang Wang<wen.gang.wang@oracle.com>
> ---
>   fs/ocfs2/dlmglue.c |   18 +++++++++++-------
>   1 files changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
> index 7642d7c..9e86d79 100644
> --- a/fs/ocfs2/dlmglue.c
> +++ b/fs/ocfs2/dlmglue.c
> @@ -359,7 +359,8 @@ static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *loc
>   static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
>   static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
>   					struct ocfs2_lock_res *lockres);
> -static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
> +static inline void ocfs2_recover_from_dlm_error(struct ocfs2_super *osb,
> +						struct ocfs2_lock_res *lockres,
>   						int convert);
>   #define ocfs2_log_dlm_error(_func, _err, _lockres) do {					\
>   	if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY)				\
> @@ -1191,7 +1192,8 @@ void ocfs2_set_locking_protocol(void)
>   	ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version);
>   }
>
> -static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
> +static inline void ocfs2_recover_from_dlm_error(struct ocfs2_super *osb,
> +						struct ocfs2_lock_res *lockres,
>   						int convert)
>   {
>   	unsigned long flags;
> @@ -1206,6 +1208,7 @@ static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
>   	spin_unlock_irqrestore(&lockres->l_lock, flags);
>
>   	wake_up(&lockres->l_event);
> +	ocfs2_wake_downconvert_thread(osb);
>   }
>
>   /* Note: If we detect another process working on the lock (i.e.,
> @@ -1246,7 +1249,7 @@ static int ocfs2_lock_create(struct ocfs2_super *osb,
>   	lockres_clear_pending(lockres, gen, osb);
>   	if (ret) {
>   		ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
> -		ocfs2_recover_from_dlm_error(lockres, 1);
> +		ocfs2_recover_from_dlm_error(osb, lockres, 1);
>   	}
>
>   	mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name);
> @@ -1478,7 +1481,7 @@ again:
>   				ocfs2_log_dlm_error("ocfs2_dlm_lock",
>   						    ret, lockres);
>   			}
> -			ocfs2_recover_from_dlm_error(lockres, 1);
> +			ocfs2_recover_from_dlm_error(osb, lockres, 1);
>   			goto out;
>   		}
>
> @@ -1502,6 +1505,7 @@ unlock:
>   	lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
>
>   	spin_unlock_irqrestore(&lockres->l_lock, flags);
> +	ocfs2_wake_downconvert_thread(osb);
>   out:
>   	/*
>   	 * This is helping work around a lock inversion between the page lock
> @@ -1891,7 +1895,7 @@ int ocfs2_file_lock(struct file *file, int ex, int trylock)
>   			ret = -EINVAL;
>   		}
>
> -		ocfs2_recover_from_dlm_error(lockres, 1);
> +		ocfs2_recover_from_dlm_error(osb, lockres, 1);
>   		lockres_remove_mask_waiter(lockres,&mw);
>   		goto out;
>   	}
> @@ -3264,7 +3268,7 @@ static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
>   	lockres_clear_pending(lockres, generation, osb);
>   	if (ret) {
>   		ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
> -		ocfs2_recover_from_dlm_error(lockres, 1);
> +		ocfs2_recover_from_dlm_error(osb, lockres, 1);
>   		goto bail;
>   	}
>
> @@ -3312,7 +3316,7 @@ static int ocfs2_cancel_convert(struct ocfs2_super *osb,
>   			       DLM_LKF_CANCEL);
>   	if (ret) {
>   		ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
> -		ocfs2_recover_from_dlm_error(lockres, 0);
> +		ocfs2_recover_from_dlm_error(osb, lockres, 0);
>   	}
>
>   	mlog(ML_BASTS, "lockres %s\n", lockres->l_name);