[Ocfs2-devel] [PATCH] ocfs2: oldmle should be put while -EEXIST returned, and the new mle should not be get once at that time.

[Joseph Qi <joseph.qi@huawei.com>]

NAK. This has already been fixed by commit 32e493265b2b ("ocfs2/dlm:
do not insert a new mle when another process is already migrating").
Please submit patch based on the latest kernel.

Thanks,
Joseph

On 2016/9/14 10:30, Guozhonghua wrote:
> 
> In the function dlm_migrate_lockres, while calling dlm_add_migration_mle, and the ret is --EEXIST.
> At this time, the oldmle should be put one time for it had been get once in dlm_find_mle.
> And the new mle should not get once for it had not been initialized before goto fail.
> 
> Signed-off-by: Guozhonghua <guozhonghua@h3c.com>
> 
> --- ocfs2.orig/dlm/dlmmaster.c  2016-09-13 15:18:13.602684325 +0800
> +++ ocfs2/dlm/dlmmaster.c       2016-09-14 10:15:10.496873879 +0800
> @@ -2573,8 +2573,6 @@ static int dlm_is_lockres_migrateable(st
>  /*
>   * DLM_MIGRATE_LOCKRES
>   */
> -
> -
>  static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
>                                struct dlm_lock_resource *res, u8 target)
>  {
> @@ -2621,20 +2619,26 @@ static int dlm_migrate_lockres(struct dl
>         spin_lock(&dlm->master_lock);
>         ret = dlm_add_migration_mle(dlm, res, mle, &oldmle, name,
>                                     namelen, target, dlm->node_num);
> +       if (ret == -EEXIST) {
> +               if(oldmle)
> +                       __dlm_put_mle(oldmle);
> +
> +               spin_unlock(&dlm->master_lock);
> +               spin_unlock(&dlm->spinlock);
> +               mlog(0, "another process is already migrating it\n");
> +               goto fail;
> +       }
> +
>         /* get an extra reference on the mle.
>          * otherwise the assert_master from the new
>          * master will destroy this.
>          */
>         dlm_get_mle_inuse(mle);
> +       mle_added = 1;
> +
>         spin_unlock(&dlm->master_lock);
>         spin_unlock(&dlm->spinlock);
> 
> -       if (ret == -EEXIST) {
> -               mlog(0, "another process is already migrating it\n");
> -               goto fail;
> -       }
> -       mle_added = 1;
> -
>         /*
>          * set the MIGRATING flag and flush asts
>          * if we fail after this we need to re-dirty the lockres
> 
> -------------------------------------------------------------------------------------------------------------------------------------
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