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authorJeremy Allison <jra@samba.org>2011-05-16 12:20:14 -0700
committerJeremy Allison <jra@samba.org>2011-05-16 22:38:20 +0200
commit8cf14c21b3bc55454728bf48b23f696e15c92aea (patch)
tree5a235ea1f083432d2c816d38784c7fcb9c9c4a42 /source3
parentfe21bdc43c0aeacfc8592998e6a90f6f83c939e0 (diff)
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Fix the SMB2 showstopper, found by an extended torture test from Volker.
In the oplock refactoring, the algorithm underwent an unnoticed change. In 3.5.x stat_opens were silently (i.e. no explicit code had comments explaining this) ignored when looking for oplock breaks and share mode violations. After the refactoring, the function find_oplock_types() no longer ignored stat_open entries in the share mode table when looking for batch and exclusive oplocks. This patch adds two changes to find_oplock_types() to ignore the case where the incoming open request is a stat open being tested against existing opens, and also when the incoming open request is a non-stat open being tested against existing stat opens. Neither of these cause an oplock break or share mode violation. Thanks a *lot* to Volker, who persevered in reproducing this problem. Autobuild-User: Jeremy Allison <jra@samba.org> Autobuild-Date: Mon May 16 22:38:20 CEST 2011 on sn-devel-104
Diffstat (limited to 'source3')
-rw-r--r--source3/smbd/open.c28
1 files changed, 25 insertions, 3 deletions
diff --git a/source3/smbd/open.c b/source3/smbd/open.c
index 5d9621748f..bb7e6c29df 100644
--- a/source3/smbd/open.c
+++ b/source3/smbd/open.c
@@ -949,7 +949,9 @@ static NTSTATUS send_break_message(files_struct *fsp,
* Do internal consistency checks on the share mode for a file.
*/
-static void find_oplock_types(struct share_mode_lock *lck,
+static void find_oplock_types(files_struct *fsp,
+ int oplock_request,
+ struct share_mode_lock *lck,
struct share_mode_entry **pp_batch,
struct share_mode_entry **pp_ex_or_batch,
bool *got_level2,
@@ -962,11 +964,27 @@ static void find_oplock_types(struct share_mode_lock *lck,
*got_level2 = false;
*got_no_oplock = false;
+ /* Ignore stat or internal opens, as is done in
+ delay_for_batch_oplocks() and
+ delay_for_exclusive_oplocks().
+ */
+ if ((oplock_request & INTERNAL_OPEN_ONLY) || is_stat_open(fsp->access_mask)) {
+ return;
+ }
+
for (i=0; i<lck->num_share_modes; i++) {
if (!is_valid_share_mode_entry(&lck->share_modes[i])) {
continue;
}
+ if (lck->share_modes[i].op_type == NO_OPLOCK &&
+ is_stat_open(lck->share_modes[i].access_mask)) {
+ /* We ignore stat opens in the table - they
+ always have NO_OPLOCK and never get or
+ cause breaks. JRA. */
+ continue;
+ }
+
if (BATCH_OPLOCK_TYPE(lck->share_modes[i].op_type)) {
/* batch - can only be one. */
if (*pp_ex_or_batch || *pp_batch || *got_level2 || *got_no_oplock) {
@@ -1906,7 +1924,9 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
}
/* Get the types we need to examine. */
- find_oplock_types(lck,
+ find_oplock_types(fsp,
+ oplock_request,
+ lck,
&batch_entry,
&exclusive_entry,
&got_level2_oplock,
@@ -2151,7 +2171,9 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
}
/* Get the types we need to examine. */
- find_oplock_types(lck,
+ find_oplock_types(fsp,
+ oplock_request,
+ lck,
&batch_entry,
&exclusive_entry,
&got_level2_oplock,