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dlm: clear defunct cancel state

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When a conversion completes successfully and finds that a cancel
of the convert is still in progress (which is now a moot point),
preemptively clear the state associated with outstanding cancel.
That state could cause a subsequent conversion to be ignored.

Also, improve the consistency and content of error and debug
messages in this area.

Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland 2009-01-28 14:37:54 -06:00
parent 5e9ccc372d
commit 43279e5376
1 changed files with 45 additions and 8 deletions
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53
fs/dlm/lock.c
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@ -835,7 +835,7 @@ static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
lkb->lkb_wait_count++;
hold_lkb(lkb);
log_debug(ls, "add overlap %x cur %d new %d count %d flags %x",
log_debug(ls, "addwait %x cur %d overlap %d count %d f %x",
lkb->lkb_id, lkb->lkb_wait_type, mstype,
lkb->lkb_wait_count, lkb->lkb_flags);
goto out;
@ -851,7 +851,7 @@ static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
list_add(&lkb->lkb_wait_reply, &ls->ls_waiters);
out:
if (error)
log_error(ls, "add_to_waiters %x error %d flags %x %d %d %s",
log_error(ls, "addwait error %x %d flags %x %d %d %s",
lkb->lkb_id, error, lkb->lkb_flags, mstype,
lkb->lkb_wait_type, lkb->lkb_resource->res_name);
mutex_unlock(&ls->ls_waiters_mutex);
@ -863,23 +863,55 @@ static int add_to_waiters(struct dlm_lkb *lkb, int mstype)
request reply on the requestqueue) between dlm_recover_waiters_pre() which
set RESEND and dlm_recover_waiters_post() */
static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype)
static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype,
struct dlm_message *ms)
{
struct dlm_ls *ls = lkb->lkb_resource->res_ls;
int overlap_done = 0;
if (is_overlap_unlock(lkb) && (mstype == DLM_MSG_UNLOCK_REPLY)) {
log_debug(ls, "remwait %x unlock_reply overlap", lkb->lkb_id);
lkb->lkb_flags &= ~DLM_IFL_OVERLAP_UNLOCK;
overlap_done = 1;
goto out_del;
}
if (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL_REPLY)) {
log_debug(ls, "remwait %x cancel_reply overlap", lkb->lkb_id);
lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
overlap_done = 1;
goto out_del;
}
/* Cancel state was preemptively cleared by a successful convert,
see next comment, nothing to do. */
if ((mstype == DLM_MSG_CANCEL_REPLY) &&
(lkb->lkb_wait_type != DLM_MSG_CANCEL)) {
log_debug(ls, "remwait %x cancel_reply wait_type %d",
lkb->lkb_id, lkb->lkb_wait_type);
return -1;
}
/* Remove for the convert reply, and premptively remove for the
cancel reply. A convert has been granted while there's still
an outstanding cancel on it (the cancel is moot and the result
in the cancel reply should be 0). We preempt the cancel reply
because the app gets the convert result and then can follow up
with another op, like convert. This subsequent op would see the
lingering state of the cancel and fail with -EBUSY. */
if ((mstype == DLM_MSG_CONVERT_REPLY) &&
(lkb->lkb_wait_type == DLM_MSG_CONVERT) &&
is_overlap_cancel(lkb) && ms && !ms->m_result) {
log_debug(ls, "remwait %x convert_reply zap overlap_cancel",
lkb->lkb_id);
lkb->lkb_wait_type = 0;
lkb->lkb_flags &= ~DLM_IFL_OVERLAP_CANCEL;
lkb->lkb_wait_count--;
goto out_del;
}
/* N.B. type of reply may not always correspond to type of original
msg due to lookup->request optimization, verify others? */
@ -888,8 +920,8 @@ static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype)
goto out_del;
}
log_error(ls, "remove_from_waiters lkid %x flags %x types %d %d",
lkb->lkb_id, lkb->lkb_flags, mstype, lkb->lkb_wait_type);
log_error(ls, "remwait error %x reply %d flags %x no wait_type",
lkb->lkb_id, mstype, lkb->lkb_flags);
return -1;
out_del:
@ -899,7 +931,7 @@ static int _remove_from_waiters(struct dlm_lkb *lkb, int mstype)
this would happen */
if (overlap_done && lkb->lkb_wait_type) {
log_error(ls, "remove_from_waiters %x reply %d give up on %d",
log_error(ls, "remwait error %x reply %d wait_type %d overlap",
lkb->lkb_id, mstype, lkb->lkb_wait_type);
lkb->lkb_wait_count--;
lkb->lkb_wait_type = 0;
@ -921,7 +953,7 @@ static int remove_from_waiters(struct dlm_lkb *lkb, int mstype)
int error;
mutex_lock(&ls->ls_waiters_mutex);
error = _remove_from_waiters(lkb, mstype);
error = _remove_from_waiters(lkb, mstype, NULL);
mutex_unlock(&ls->ls_waiters_mutex);
return error;
}
@ -936,7 +968,7 @@ static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms)
if (ms != &ls->ls_stub_ms)
mutex_lock(&ls->ls_waiters_mutex);
error = _remove_from_waiters(lkb, ms->m_type);
error = _remove_from_waiters(lkb, ms->m_type, ms);
if (ms != &ls->ls_stub_ms)
mutex_unlock(&ls->ls_waiters_mutex);
return error;
@ -2083,6 +2115,11 @@ static int validate_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb,
lkb->lkb_timeout_cs = args->timeout;
rv = 0;
out:
if (rv)
log_debug(ls, "validate_lock_args %d %x %x %x %d %d %s",
rv, lkb->lkb_id, lkb->lkb_flags, args->flags,
lkb->lkb_status, lkb->lkb_wait_type,
lkb->lkb_resource->res_name);
return rv;
}