Revert "Fix bug #8175 - smbd deadlock."

This reverts commit 5a2b5b6cfed74e0e9c2965525995f64cdad7b7c9.

1 files changed, 26 insertions, 68 deletions

diff --git a/source3/smbd/open.c b/source3/smbd/open.c
index 7a85552910..1fd8c11e2d 100644
--- a/source3/smbd/open.c
+++ b/source3/smbd/open.c
@@ -1204,8 +1204,18 @@ static bool delay_for_exclusive_oplocks(files_struct *fsp,
 	return true;
 }
 
+static bool file_has_brlocks(files_struct *fsp)
+{
+	struct byte_range_lock *br_lck;
+
+	br_lck = brl_get_locks_readonly(fsp);
+	if (!br_lck)
+		return false;
+
+	return br_lck->num_locks > 0 ? true : false;
+}
+
 static void grant_fsp_oplock_type(files_struct *fsp,
-				const struct byte_range_lock *br_lck,
 				int oplock_request,
 				bool got_level2_oplock,
 				bool got_a_none_oplock)
@@ -1223,7 +1233,7 @@ static void grant_fsp_oplock_type(files_struct *fsp,
 		DEBUG(10,("grant_fsp_oplock_type: oplock type 0x%x on file %s\n",
 			fsp->oplock_type, fsp_str_dbg(fsp)));
 		return;
-	} else if (br_lck && br_lck->num_locks > 0) {
+	} else if (lp_locking(fsp->conn->params) && file_has_brlocks(fsp)) {
 		DEBUG(10,("grant_fsp_oplock_type: file %s has byte range locks\n",
 			fsp_str_dbg(fsp)));
 		fsp->oplock_type = NO_OPLOCK;
@@ -1593,52 +1603,6 @@ void remove_deferred_open_entry(struct file_id id, uint64_t mid,
 	TALLOC_FREE(lck);
 }
 
-/****************************************************************
- Ensure we get the brlock lock followed by the share mode lock
- in the correct order to prevent deadlocks if other smbd's are
- using the brlock database on this file simultaneously with this open
- (that code also gets the locks in brlock -> share mode lock order).
-****************************************************************/
-
-static bool acquire_ordered_locks(TALLOC_CTX *mem_ctx,
-				files_struct *fsp,
-				const struct file_id id,
-				const char *connectpath,
-				const struct smb_filename *smb_fname,
-				const struct timespec *p_old_write_time,
-				struct share_mode_lock **p_lck,
-				struct byte_range_lock **p_br_lck)
-{
-	/* Ordering - we must get the br_lck for this
-	   file before the share mode. */
-	if (lp_locking(fsp->conn->params)) {
-		*p_br_lck = brl_get_locks_readonly(fsp);
-		if (*p_br_lck == NULL) {
-			DEBUG(0, ("Could not get br_lock\n"));
-			return false;
-		}
-		/* Note - we don't need to free the returned
-		   br_lck explicitly as it was allocated on talloc_tos()
-		   and so will be autofreed (and release the lock)
-		   once the frame context disappears.
-
-		   If it was set to fsp->brlock_rec then it was
-		   talloc_move'd to hang off the fsp pointer and
-		   in this case is guarenteed to not be holding the
-		   lock on the brlock database. */
-	}
-
-	*p_lck = get_share_mode_lock_fresh(
-		mem_ctx, id, connectpath, smb_fname, p_old_write_time);
-
-	if (*p_lck == NULL) {
-		DEBUG(0, ("Could not get share mode lock\n"));
-		TALLOC_FREE(*p_br_lck);
-		return false;
-	}
-	return true;
-}
-
 /****************************************************************************
  Open a file with a share mode. Passed in an already created files_struct *.
 ****************************************************************************/
@@ -1975,7 +1939,6 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
 	}
 
 	if (file_existed) {
-		struct byte_range_lock *br_lck = NULL;
 		struct share_mode_entry *batch_entry = NULL;
 		struct share_mode_entry *exclusive_entry = NULL;
 		bool got_level2_oplock = false;
@@ -1985,14 +1948,11 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
 		struct timespec old_write_time = smb_fname->st.st_ex_mtime;
 		id = vfs_file_id_from_sbuf(conn, &smb_fname->st);
 
-		if (!acquire_ordered_locks(talloc_tos(),
-					fsp,
-					id,
-					conn->connectpath,
-					smb_fname,
-					&old_write_time,
-					&lck,
-					&br_lck)) {
+		lck = get_share_mode_lock_fresh(talloc_tos(), id,
+						conn->connectpath,
+						smb_fname, &old_write_time);
+		if (lck == NULL) {
+			DEBUG(0, ("Could not get share mode lock\n"));
 			return NT_STATUS_SHARING_VIOLATION;
 		}
 
@@ -2046,7 +2006,6 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
 		}
 
 		grant_fsp_oplock_type(fsp,
-				br_lck,
                                 oplock_request,
                                 got_level2_oplock,
                                 got_a_none_oplock);
@@ -2208,7 +2167,6 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
 	}
 
 	if (!file_existed) {
-		struct byte_range_lock *br_lck = NULL;
 		struct share_mode_entry *batch_entry = NULL;
 		struct share_mode_entry *exclusive_entry = NULL;
 		bool got_level2_oplock = false;
@@ -2232,14 +2190,15 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
 
 		id = fsp->file_id;
 
-		if (!acquire_ordered_locks(talloc_tos(),
-					fsp,
-					id,
-					conn->connectpath,
-					smb_fname,
-					&old_write_time,
-					&lck,
-					&br_lck)) {
+		lck = get_share_mode_lock_fresh(talloc_tos(), id,
+						conn->connectpath,
+						smb_fname, &old_write_time);
+
+		if (lck == NULL) {
+			DEBUG(0, ("open_file_ntcreate: Could not get share "
+				  "mode lock for %s\n",
+				  smb_fname_str_dbg(smb_fname)));
+			fd_close(fsp);
 			return NT_STATUS_SHARING_VIOLATION;
 		}
 
@@ -2309,7 +2268,6 @@ static NTSTATUS open_file_ntcreate(connection_struct *conn,
 		}
 
 		grant_fsp_oplock_type(fsp,
-				br_lck,
                                 oplock_request,
                                 got_level2_oplock,
                                 got_a_none_oplock);