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authorDavid Teigland <teigland@redhat.com>2007-05-29 08:46:00 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2007-07-09 08:22:54 +0100
commit8b4021fa436f7c76a2299e6d85d4d4a619724e9a (patch)
tree4e3be51910ede8a36d640229bb1d20d3f7547652 /fs/dlm/lock.c
parent84d8cd69a8e7f1c9962f46bc79850c9f1f663806 (diff)
downloadlinux-8b4021fa436f7c76a2299e6d85d4d4a619724e9a.tar.bz2
[DLM] canceling deadlocked lock
Add a function that can be used through libdlm by a system daemon to cancel another process's deadlocked lock. A completion ast with EDEADLK is returned to the process waiting for the lock. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/dlm/lock.c')
-rw-r--r--fs/dlm/lock.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index df91578145d1..de943afacb37 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -300,6 +300,11 @@ static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
rv = -ETIMEDOUT;
}
+ if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_DEADLOCK_CANCEL)) {
+ lkb->lkb_flags &= ~DLM_IFL_DEADLOCK_CANCEL;
+ rv = -EDEADLK;
+ }
+
lkb->lkb_lksb->sb_status = rv;
lkb->lkb_lksb->sb_flags = lkb->lkb_sbflags;
@@ -4450,6 +4455,54 @@ int dlm_user_cancel(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
return error;
}
+int dlm_user_deadlock(struct dlm_ls *ls, uint32_t flags, uint32_t lkid)
+{
+ struct dlm_lkb *lkb;
+ struct dlm_args args;
+ struct dlm_user_args *ua;
+ struct dlm_rsb *r;
+ int error;
+
+ dlm_lock_recovery(ls);
+
+ error = find_lkb(ls, lkid, &lkb);
+ if (error)
+ goto out;
+
+ ua = (struct dlm_user_args *)lkb->lkb_astparam;
+
+ error = set_unlock_args(flags, ua, &args);
+ if (error)
+ goto out_put;
+
+ /* same as cancel_lock(), but set DEADLOCK_CANCEL after lock_rsb */
+
+ r = lkb->lkb_resource;
+ hold_rsb(r);
+ lock_rsb(r);
+
+ error = validate_unlock_args(lkb, &args);
+ if (error)
+ goto out_r;
+ lkb->lkb_flags |= DLM_IFL_DEADLOCK_CANCEL;
+
+ error = _cancel_lock(r, lkb);
+ out_r:
+ unlock_rsb(r);
+ put_rsb(r);
+
+ if (error == -DLM_ECANCEL)
+ error = 0;
+ /* from validate_unlock_args() */
+ if (error == -EBUSY)
+ error = 0;
+ out_put:
+ dlm_put_lkb(lkb);
+ out:
+ dlm_unlock_recovery(ls);
+ return error;
+}
+
/* lkb's that are removed from the waiters list by revert are just left on the
orphans list with the granted orphan locks, to be freed by purge */