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Message-Id: <1191487880270-git-send-email-swhiteho@redhat.com>
Date: Thu, 4 Oct 2007 09:49:43 +0100
From: swhiteho@...hat.com
To: linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc: Patrick Caulfield <pcaulfie@...hat.com>,
Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 50/51] [DLM] don't overwrite castparam if it's NULL
From: Patrick Caulfield <pcaulfie@...hat.com>
If the castaddr passed to the userland API is NULL then don't overwrite the
existing castparam. This allows a different thread to cancel a lock request and
the CANCEL AST gets delivered to the original thread.
bz#306391 (for RHEL4) refers.
Signed-Off-By: Patrick Caulfield <pcaulfie@...hat.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 2082daf..031229f 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -4429,7 +4429,8 @@ int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
if (lvb_in && ua->lksb.sb_lvbptr)
memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
- ua->castparam = ua_tmp->castparam;
+ if (ua_tmp->castparam)
+ ua->castparam = ua_tmp->castparam;
ua->user_lksb = ua_tmp->user_lksb;
error = set_unlock_args(flags, ua, &args);
@@ -4474,7 +4475,8 @@ int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
goto out;
ua = (struct dlm_user_args *)lkb->lkb_astparam;
- ua->castparam = ua_tmp->castparam;
+ if (ua_tmp->castparam)
+ ua->castparam = ua_tmp->castparam;
ua->user_lksb = ua_tmp->user_lksb;
error = set_unlock_args(flags, ua, &args);
--
1.5.1.2
-
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