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dlm: use spin_lock_bh for message processing

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Use spin_lock_bh for all spinlocks involved in message processing,
in preparation for softirq message processing.  DLM lock requests
from user space involve dlm processing in user context, in addition
to the standard kernel context, necessitating bh variants.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring
2024-04-02 15:18:09 -04:00
committed by David Teigland
parent 308533b4b1
commit 578acf9a87
14 changed files with 287 additions and 258 deletions
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16
fs/dlm/lowcomms.c
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@@ -867,36 +867,36 @@ static void process_dlm_messages(struct work_struct *work)
{
struct processqueue_entry *pentry;
spin_lock(&processqueue_lock);
spin_lock_bh(&processqueue_lock);
pentry = list_first_entry_or_null(&processqueue,
struct processqueue_entry, list);
if (WARN_ON_ONCE(!pentry)) {
process_dlm_messages_pending = false;
spin_unlock(&processqueue_lock);
spin_unlock_bh(&processqueue_lock);
return;
}
list_del(&pentry->list);
atomic_dec(&processqueue_count);
spin_unlock(&processqueue_lock);
spin_unlock_bh(&processqueue_lock);
for (;;) {
dlm_process_incoming_buffer(pentry->nodeid, pentry->buf,
pentry->buflen);
free_processqueue_entry(pentry);
spin_lock(&processqueue_lock);
spin_lock_bh(&processqueue_lock);
pentry = list_first_entry_or_null(&processqueue,
struct processqueue_entry, list);
if (!pentry) {
process_dlm_messages_pending = false;
spin_unlock(&processqueue_lock);
spin_unlock_bh(&processqueue_lock);
break;
}
list_del(&pentry->list);
atomic_dec(&processqueue_count);
spin_unlock(&processqueue_lock);
spin_unlock_bh(&processqueue_lock);
}
}
@@ -966,14 +966,14 @@ again:
memmove(con->rx_leftover_buf, pentry->buf + ret,
con->rx_leftover);
spin_lock(&processqueue_lock);
spin_lock_bh(&processqueue_lock);
ret = atomic_inc_return(&processqueue_count);
list_add_tail(&pentry->list, &processqueue);
if (!process_dlm_messages_pending) {
process_dlm_messages_pending = true;
queue_work(process_workqueue, &process_work);
}
spin_unlock(&processqueue_lock);
spin_unlock_bh(&processqueue_lock);
if (ret > DLM_MAX_PROCESS_BUFFERS)
return DLM_IO_FLUSH;