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The same lease can be used via different TCP connections (yes, we have tests for this!). At the end of downgrade_lease() we update all fsp's with fsps_lease_update() that link to the lease that just was changed. However, this is only in the local process, this is not cross-smbd. So other smbds using the same lease can use stale information and for example get the mandatory locking wrong. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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Lease utility functions
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Copyright (C) Jeremy Allison 2017.
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Copyright (C) Stefan (metze) Metzmacher 2017.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define DBGC_CLASS DBGC_LOCKING
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#include "includes.h"
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#include "../librpc/gen_ndr/open_files.h"
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#include "locking/proto.h"
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#include "smbd/globals.h"
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#include "locking/leases_db.h"
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uint32_t map_oplock_to_lease_type(uint16_t op_type)
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{
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uint32_t ret;
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switch(op_type) {
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case BATCH_OPLOCK:
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case BATCH_OPLOCK|EXCLUSIVE_OPLOCK:
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ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE;
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break;
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case EXCLUSIVE_OPLOCK:
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ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE;
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break;
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case LEVEL_II_OPLOCK:
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ret = SMB2_LEASE_READ;
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break;
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default:
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ret = SMB2_LEASE_NONE;
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break;
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}
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return ret;
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}
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uint32_t fsp_lease_type(struct files_struct *fsp)
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{
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NTSTATUS status;
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if (fsp->oplock_type != LEASE_OPLOCK) {
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uint32_t type = map_oplock_to_lease_type(fsp->oplock_type);
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return type;
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}
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status = leases_db_get_current_state(
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fsp_client_guid(fsp),
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&fsp->lease->lease.lease_key,
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&fsp->leases_db_seqnum,
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&fsp->lease_type);
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if (!NT_STATUS_IS_OK(status)) {
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DBG_DEBUG("leases_db_get_current_state failed: %s\n",
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nt_errstr(status));
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fsp->lease_type = 0; /* no lease */
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}
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return fsp->lease_type;
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}
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static uint32_t lease_type_is_exclusive(uint32_t lease_type)
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{
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if ((lease_type & (SMB2_LEASE_READ | SMB2_LEASE_WRITE)) ==
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(SMB2_LEASE_READ | SMB2_LEASE_WRITE)) {
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return true;
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}
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return false;
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}
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bool fsp_lease_type_is_exclusive(struct files_struct *fsp)
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{
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uint32_t lease_type = fsp_lease_type(fsp);
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return lease_type_is_exclusive(lease_type);
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}
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const struct GUID *fsp_client_guid(const files_struct *fsp)
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{
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return &fsp->conn->sconn->client->connections->smb2.client.guid;
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}
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