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ocfs2: do not modify lksb->status in the unlock ast 

This can race with other ast notification, which can cause bad status values
to propagate into the unlock ast.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Kurt Hackel 2006-06-18 21:28:01 -07:00 committed by Mark Fasheh
parent 4b1af77445
commit a23eac99d4
1 changed files with 12 additions and 25 deletions
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37
fs/ocfs2/dlm/dlmunlock.c
View File

@ -155,7 +155,7 @@ static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
else
status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions);
if (status != DLM_NORMAL)
if (status != DLM_NORMAL && status != DLM_CANCELGRANT)
goto leave;
/* By now this has been masked out of cancel requests. */
@ -183,8 +183,7 @@ static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
spin_lock(&lock->spinlock);
/* if the master told us the lock was already granted,
* let the ast handle all of these actions */
if (status == DLM_NORMAL &&
lksb->status == DLM_CANCELGRANT) {
if (status == DLM_CANCELGRANT) {
actions &= ~(DLM_UNLOCK_REMOVE_LOCK|
DLM_UNLOCK_REGRANT_LOCK|
DLM_UNLOCK_CLEAR_CONVERT_TYPE);
@ -349,14 +348,9 @@ static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
vec, veclen, owner, &status);
if (tmpret >= 0) {
// successfully sent and received
if (status == DLM_CANCELGRANT)
ret = DLM_NORMAL;
else if (status == DLM_FORWARD) {
if (status == DLM_FORWARD)
mlog(0, "master was in-progress. retry\n");
ret = DLM_FORWARD;
} else
ret = status;
lksb->status = status;
ret = status;
} else {
mlog_errno(tmpret);
if (dlm_is_host_down(tmpret)) {
@ -372,7 +366,6 @@ static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
/* something bad. this will BUG in ocfs2 */
ret = dlm_err_to_dlm_status(tmpret);
}
lksb->status = ret;
}
return ret;
@ -511,11 +504,8 @@ not_found:
"cookie=%u:%llu\n",
dlm_get_lock_cookie_node(unlock->cookie),
dlm_get_lock_cookie_seq(unlock->cookie));
else {
/* send the lksb->status back to the other node */
status = lksb->status;
else
dlm_lock_put(lock);
}
leave:
if (res)
@ -537,26 +527,22 @@ static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
if (dlm_lock_on_list(&res->blocked, lock)) {
/* cancel this outright */
lksb->status = DLM_NORMAL;
status = DLM_NORMAL;
*actions = (DLM_UNLOCK_CALL_AST |
DLM_UNLOCK_REMOVE_LOCK);
} else if (dlm_lock_on_list(&res->converting, lock)) {
/* cancel the request, put back on granted */
lksb->status = DLM_NORMAL;
status = DLM_NORMAL;
*actions = (DLM_UNLOCK_CALL_AST |
DLM_UNLOCK_REMOVE_LOCK |
DLM_UNLOCK_REGRANT_LOCK |
DLM_UNLOCK_CLEAR_CONVERT_TYPE);
} else if (dlm_lock_on_list(&res->granted, lock)) {
/* too late, already granted. DLM_CANCELGRANT */
lksb->status = DLM_CANCELGRANT;
status = DLM_NORMAL;
/* too late, already granted. */
status = DLM_CANCELGRANT;
*actions = DLM_UNLOCK_CALL_AST;
} else {
mlog(ML_ERROR, "lock to cancel is not on any list!\n");
lksb->status = DLM_IVLOCKID;
status = DLM_IVLOCKID;
*actions = 0;
}
@ -573,13 +559,11 @@ static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
/* unlock request */
if (!dlm_lock_on_list(&res->granted, lock)) {
lksb->status = DLM_DENIED;
status = DLM_DENIED;
dlm_error(status);
*actions = 0;
} else {
/* unlock granted lock */
lksb->status = DLM_NORMAL;
status = DLM_NORMAL;
*actions = (DLM_UNLOCK_FREE_LOCK |
DLM_UNLOCK_CALL_AST |
@ -671,7 +655,7 @@ retry:
}
if (call_ast) {
mlog(0, "calling unlockast(%p, %d)\n", data, lksb->status);
mlog(0, "calling unlockast(%p, %d)\n", data, status);
if (is_master) {
/* it is possible that there is one last bast
* pending. make sure it is flushed, then
@ -683,9 +667,12 @@ retry:
wait_event(dlm->ast_wq,
dlm_lock_basts_flushed(dlm, lock));
}
(*unlockast)(data, lksb->status);
(*unlockast)(data, status);
}
if (status == DLM_CANCELGRANT)
status = DLM_NORMAL;
if (status == DLM_NORMAL) {
mlog(0, "kicking the thread\n");
dlm_kick_thread(dlm, res);