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dlm: use workqueue for callbacks

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Instead of creating our own kthread (dlm_astd) to deliver
callbacks for all lockspaces, use a per-lockspace workqueue
to deliver the callbacks.  This eliminates complications and
slowdowns from many lockspaces sharing the same thread.

Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland 2011-04-05 13:16:24 -05:00
parent 883ba74f43
commit 23e8e1aaac
7 changed files with 185 additions and 218 deletions
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12
fs/dlm/user.c
View file

@ -213,9 +213,9 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode,
goto out;
}
if (list_empty(&lkb->lkb_astqueue)) {
if (list_empty(&lkb->lkb_cb_list)) {
kref_get(&lkb->lkb_ref);
list_add_tail(&lkb->lkb_astqueue, &proc->asts);
list_add_tail(&lkb->lkb_cb_list, &proc->asts);
wake_up_interruptible(&proc->wait);
}
spin_unlock(&proc->asts_spin);
@ -832,24 +832,24 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count,
}
/* if we empty lkb_callbacks, we don't want to unlock the spinlock
without removing lkb_astqueue; so empty lkb_astqueue is always
without removing lkb_cb_list; so empty lkb_cb_list is always
consistent with empty lkb_callbacks */
lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue);
lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_cb_list);
rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid);
if (rv < 0) {
/* this shouldn't happen; lkb should have been removed from
list when resid was zero */
log_print("dlm_rem_lkb_callback empty %x", lkb->lkb_id);
list_del_init(&lkb->lkb_astqueue);
list_del_init(&lkb->lkb_cb_list);
spin_unlock(&proc->asts_spin);
/* removes ref for proc->asts, may cause lkb to be freed */
dlm_put_lkb(lkb);
goto try_another;
}
if (!resid)
list_del_init(&lkb->lkb_astqueue);
list_del_init(&lkb->lkb_cb_list);
spin_unlock(&proc->asts_spin);
if (cb.flags & DLM_CB_SKIP) {