[DLM] fix user unlocking
When a user process exits, we clear all the locks it holds. There is a
problem, though, with locks that the process had begun unlocking before it
exited. We couldn't find the lkb's that were in the process of being
unlocked remotely, to flag that they are DEAD. To solve this, we move
lkb's being unlocked onto a new list in the per-process structure that
tracks what locks the process is holding. We can then go through this
list to flag the necessary lkb's when clearing locks for a process when it
exits.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index ee993c5c..61d9320 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -526,6 +526,7 @@
spinlock_t asts_spin;
struct list_head locks;
spinlock_t locks_spin;
+ struct list_head unlocking;
wait_queue_head_t wait;
};
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 5bac982..6ad2b8e 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -3772,12 +3772,10 @@
goto out_put;
spin_lock(&ua->proc->locks_spin);
- list_del_init(&lkb->lkb_ownqueue);
+ /* dlm_user_add_ast() may have already taken lkb off the proc list */
+ if (!list_empty(&lkb->lkb_ownqueue))
+ list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking);
spin_unlock(&ua->proc->locks_spin);
-
- /* this removes the reference for the proc->locks list added by
- dlm_user_request */
- unhold_lkb(lkb);
out_put:
dlm_put_lkb(lkb);
out:
@@ -3817,9 +3815,8 @@
/* this lkb was removed from the WAITING queue */
if (lkb->lkb_grmode == DLM_LOCK_IV) {
spin_lock(&ua->proc->locks_spin);
- list_del_init(&lkb->lkb_ownqueue);
+ list_move(&lkb->lkb_ownqueue, &ua->proc->unlocking);
spin_unlock(&ua->proc->locks_spin);
- unhold_lkb(lkb);
}
out_put:
dlm_put_lkb(lkb);
@@ -3880,11 +3877,6 @@
mutex_lock(&ls->ls_clear_proc_locks);
list_for_each_entry_safe(lkb, safe, &proc->locks, lkb_ownqueue) {
- if (lkb->lkb_ast_type) {
- list_del(&lkb->lkb_astqueue);
- unhold_lkb(lkb);
- }
-
list_del_init(&lkb->lkb_ownqueue);
if (lkb->lkb_exflags & DLM_LKF_PERSISTENT) {
@@ -3901,6 +3893,20 @@
dlm_put_lkb(lkb);
}
+
+ /* in-progress unlocks */
+ list_for_each_entry_safe(lkb, safe, &proc->unlocking, lkb_ownqueue) {
+ list_del_init(&lkb->lkb_ownqueue);
+ lkb->lkb_flags |= DLM_IFL_DEAD;
+ dlm_put_lkb(lkb);
+ }
+
+ list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) {
+ list_del(&lkb->lkb_astqueue);
+ dlm_put_lkb(lkb);
+ }
+
mutex_unlock(&ls->ls_clear_proc_locks);
unlock_recovery(ls);
}
+
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index c37e93e..d378b7f 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -180,6 +180,14 @@
ua->lksb.sb_status == -EAGAIN && !list_empty(&lkb->lkb_ownqueue))
remove_ownqueue = 1;
+ /* unlocks or cancels of waiting requests need to be removed from the
+ proc's unlocking list, again there must be a better way... */
+
+ if (ua->lksb.sb_status == -DLM_EUNLOCK ||
+ (ua->lksb.sb_status == -DLM_ECANCEL &&
+ lkb->lkb_grmode == DLM_LOCK_IV))
+ remove_ownqueue = 1;
+
/* We want to copy the lvb to userspace when the completion
ast is read if the status is 0, the lock has an lvb and
lvb_ops says we should. We could probably have set_lvb_lock()
@@ -523,6 +531,7 @@
proc->lockspace = ls->ls_local_handle;
INIT_LIST_HEAD(&proc->asts);
INIT_LIST_HEAD(&proc->locks);
+ INIT_LIST_HEAD(&proc->unlocking);
spin_lock_init(&proc->asts_spin);
spin_lock_init(&proc->locks_spin);
init_waitqueue_head(&proc->wait);
