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authorVolker Lendecke <vl@samba.org>2011-12-14 16:54:07 +0100
committerVolker Lendecke <vlendec@samba.org>2011-12-14 19:08:30 +0100
commit1bea57a6c35ed92f63a822accf15e4ace79ef60c (patch)
tree2b49d32579c8410ccd0fcc59f6027c1c79f02105 /source3/smbd
parentc889c8d7055102276bc10ae00c60f7ebc5a293c3 (diff)
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s3: Fix raw.mux after UNUSED_SHARE_MODE_ENTRY was removed
See the large comment in notify_deferred_opens for an explanation Autobuild-User: Volker Lendecke <vlendec@samba.org> Autobuild-Date: Wed Dec 14 19:08:30 CET 2011 on sn-devel-104
Diffstat (limited to 'source3/smbd')
-rw-r--r--source3/smbd/close.c60
1 files changed, 55 insertions, 5 deletions
diff --git a/source3/smbd/close.c b/source3/smbd/close.c
index 9eedaf9e66..26656f47a2 100644
--- a/source3/smbd/close.c
+++ b/source3/smbd/close.c
@@ -156,6 +156,13 @@ static NTSTATUS close_filestruct(files_struct *fsp)
return status;
}
+static int compare_share_mode_times(const void *p1, const void *p2)
+{
+ struct share_mode_entry *s1 = (struct share_mode_entry *)p1;
+ struct share_mode_entry *s2 = (struct share_mode_entry *)p2;
+ return timeval_compare(&s1->time, &s2->time);
+}
+
/****************************************************************************
If any deferred opens are waiting on this close, notify them.
****************************************************************************/
@@ -163,18 +170,60 @@ static NTSTATUS close_filestruct(files_struct *fsp)
static void notify_deferred_opens(struct smbd_server_connection *sconn,
struct share_mode_lock *lck)
{
- int i;
+ uint32_t i, num_deferred;
+ struct share_mode_entry *deferred;
if (!should_notify_deferred_opens()) {
return;
}
- for (i=0; i<lck->num_share_modes; i++) {
+ num_deferred = 0;
+ for (i=0; i<lck->num_share_modes; i++) {
+ if (is_deferred_open_entry(&lck->share_modes[i])) {
+ num_deferred += 1;
+ }
+ }
+ if (num_deferred == 0) {
+ return;
+ }
+
+ deferred = talloc_array(talloc_tos(), struct share_mode_entry,
+ num_deferred);
+ if (deferred == NULL) {
+ return;
+ }
+
+ num_deferred = 0;
+ for (i=0; i<lck->num_share_modes; i++) {
struct share_mode_entry *e = &lck->share_modes[i];
+ if (is_deferred_open_entry(e)) {
+ deferred[num_deferred] = *e;
+ num_deferred += 1;
+ }
+ }
- if (!is_deferred_open_entry(e)) {
- continue;
- }
+ /*
+ * We need to sort the notifications by initial request time. Imagine
+ * two opens come in asyncronously, both conflicting with the open we
+ * just close here. If we don't sort the notifications, the one that
+ * came in last might get the response before the one that came in
+ * first. This is demonstrated with the smbtorture4 raw.mux test.
+ *
+ * As long as we had the UNUSED_SHARE_MODE_ENTRY, we happened to
+ * survive this particular test. Without UNUSED_SHARE_MODE_ENTRY, we
+ * shuffle the share mode entries around a bit, so that we do not
+ * survive raw.mux anymore.
+ *
+ * We could have kept the ordering in del_share_mode, but as the
+ * ordering was never formalized I think it is better to do it here
+ * where it is necessary.
+ */
+
+ qsort(deferred, num_deferred, sizeof(struct share_mode_entry),
+ compare_share_mode_times);
+
+ for (i=0; i<num_deferred; i++) {
+ struct share_mode_entry *e = &deferred[i];
if (procid_is_me(&e->pid)) {
/*
@@ -195,6 +244,7 @@ static void notify_deferred_opens(struct smbd_server_connection *sconn,
MSG_SMB_SHARE_MODE_ENTRY_SIZE);
}
}
+ TALLOC_FREE(deferred);
}
/****************************************************************************