1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright 2017 Nexenta Systems, Inc. All rights reserved. 24 */ 25 26 /* 27 * smb1 oplock support 28 */ 29 30 #include <smbsrv/smb_kproto.h> 31 32 #define BATCH_OR_EXCL (OPLOCK_LEVEL_BATCH | OPLOCK_LEVEL_ONE) 33 34 /* 35 * Client has an open handle and requests an oplock. 36 * Convert SMB1 oplock request info in to internal form, 37 * call common oplock code, convert result to SMB1. 38 */ 39 void 40 smb1_oplock_acquire(smb_request_t *sr, boolean_t level2ok) 41 { 42 smb_arg_open_t *op = &sr->arg.open; 43 smb_ofile_t *ofile = sr->fid_ofile; 44 uint32_t status; 45 46 /* Only disk trees get oplocks. */ 47 if ((sr->tid_tree->t_res_type & STYPE_MASK) != STYPE_DISKTREE) { 48 op->op_oplock_level = SMB_OPLOCK_NONE; 49 return; 50 } 51 52 if (!smb_tree_has_feature(sr->tid_tree, SMB_TREE_OPLOCKS)) { 53 op->op_oplock_level = SMB_OPLOCK_NONE; 54 return; 55 } 56 57 if (!smb_session_levelII_oplocks(sr->session)) 58 level2ok = B_FALSE; 59 60 /* Common code checks file type. */ 61 62 /* 63 * SMB1: Convert to internal form. 64 */ 65 switch (op->op_oplock_level) { 66 case SMB_OPLOCK_BATCH: 67 op->op_oplock_state = OPLOCK_LEVEL_BATCH; 68 break; 69 case SMB_OPLOCK_EXCLUSIVE: 70 op->op_oplock_state = OPLOCK_LEVEL_ONE; 71 break; 72 case SMB_OPLOCK_LEVEL_II: 73 op->op_oplock_state = OPLOCK_LEVEL_TWO; 74 break; 75 case SMB_OPLOCK_NONE: 76 default: 77 op->op_oplock_level = SMB_OPLOCK_NONE; 78 return; 79 } 80 81 /* 82 * Tree options may force shared oplocks 83 */ 84 if (smb_tree_has_feature(sr->tid_tree, SMB_TREE_FORCE_L2_OPLOCK)) { 85 op->op_oplock_state = OPLOCK_LEVEL_TWO; 86 } 87 88 /* 89 * Try exclusive first, if requested 90 */ 91 if ((op->op_oplock_state & BATCH_OR_EXCL) != 0) { 92 status = smb_oplock_request(sr, ofile, 93 &op->op_oplock_state); 94 } else { 95 status = NT_STATUS_OPLOCK_NOT_GRANTED; 96 } 97 98 /* 99 * If exclusive failed (or tree forced shared oplocks) 100 * and if the caller supports Level II, try shared. 101 */ 102 if (status == NT_STATUS_OPLOCK_NOT_GRANTED && level2ok) { 103 op->op_oplock_state = OPLOCK_LEVEL_TWO; 104 status = smb_oplock_request(sr, ofile, 105 &op->op_oplock_state); 106 } 107 108 /* 109 * Either of the above may have returned the 110 * status code that says we should wait. 111 */ 112 if (status == NT_STATUS_OPLOCK_BREAK_IN_PROGRESS) { 113 (void) smb_oplock_wait_break(ofile->f_node, 0); 114 status = 0; 115 } 116 117 /* 118 * Keep track of what we got (in ofile->f_oplock.og_state) 119 * so we'll know what we had when sending a break later. 120 * The og_dialect here is the oplock dialect, which may be 121 * different than SMB dialect. Pre-NT clients did not 122 * support "Level II" oplocks. If we're talking to a 123 * client that didn't set the CAP_LEVEL_II_OPLOCKS in 124 * its capabilities, let og_dialect = LANMAN2_1. 125 */ 126 ofile->f_oplock.og_dialect = (level2ok) ? 127 NT_LM_0_12 : LANMAN2_1; 128 switch (status) { 129 case NT_STATUS_SUCCESS: 130 ofile->f_oplock.og_state = op->op_oplock_state; 131 break; 132 case NT_STATUS_OPLOCK_NOT_GRANTED: 133 ofile->f_oplock.og_state = 0; 134 op->op_oplock_level = SMB_OPLOCK_NONE; 135 return; 136 default: 137 /* Caller did not check args sufficiently? */ 138 cmn_err(CE_NOTE, "clnt %s oplock req. err 0x%x", 139 sr->session->ip_addr_str, status); 140 ofile->f_oplock.og_state = 0; 141 op->op_oplock_level = SMB_OPLOCK_NONE; 142 return; 143 } 144 145 /* 146 * Have STATUS_SUCCESS 147 * Convert internal oplock state to SMB1 148 */ 149 if (op->op_oplock_state & OPLOCK_LEVEL_BATCH) { 150 op->op_oplock_level = SMB_OPLOCK_BATCH; 151 } else if (op->op_oplock_state & OPLOCK_LEVEL_ONE) { 152 op->op_oplock_level = SMB_OPLOCK_EXCLUSIVE; 153 } else if (op->op_oplock_state & OPLOCK_LEVEL_TWO) { 154 op->op_oplock_level = SMB_OPLOCK_LEVEL_II; 155 } else { 156 op->op_oplock_level = SMB_OPLOCK_NONE; 157 } 158 } 159