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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * The flush SMB is sent to ensure all data and allocation information 30 * for the corresponding file has been written to stable storage. This 31 * is a synchronous request. The response should not be sent until the 32 * writes are complete. 33 * 34 * The SmbFlush request is described in CIFS/1.0 1996 Section 3.9.14. 35 * 36 * CIFS/1.0 June 13, 1996 37 * Heizer, et al 38 * draft-heizer-cifs-v1-spec-00.txt 39 */ 40 41 #include <smbsrv/smb_incl.h> 42 #include <smbsrv/smb_fsops.h> 43 44 45 static void smb_flush_file(struct smb_request *sr, struct smb_ofile *ofile); 46 47 48 int smb_flush_required = 1; 49 50 51 /* 52 * smb_commit_required 53 * 54 * Specify whether or not SmbFlush should send commit requests to the 55 * file system. If state is non-zero, commit requests will be sent to 56 * the file system. If state is zero, SmbFlush is a no-op. 57 */ 58 void 59 smb_commit_required(int state) 60 { 61 smb_flush_required = state; 62 } 63 64 65 /* 66 * smb_com_flush 67 * 68 * Flush any cached data for a specified file, or for all files that 69 * this client has open, to stable storage. If the fid is valid (i.e. 70 * not 0xFFFF), we flush only that file. Otherwise we flush all files 71 * associated with this client. 72 * 73 * We need to protect the list because there's a good chance we'll 74 * block during the flush operation. 75 */ 76 int 77 smb_com_flush(smb_request_t *sr) 78 { 79 smb_ofile_t *file; 80 smb_llist_t *flist; 81 82 if (smbsr_decode_vwv(sr, "w", &sr->smb_fid) != 0) { 83 smbsr_decode_error(sr); 84 /* NOTREACHED */ 85 } 86 87 if (smb_flush_required == 0) { 88 smbsr_encode_empty_result(sr); 89 return (SDRC_NORMAL_REPLY); 90 } 91 92 if (sr->smb_fid != 0xffff) { 93 sr->fid_ofile = smb_ofile_lookup_by_fid(sr->tid_tree, 94 sr->smb_fid); 95 if (sr->fid_ofile == NULL) { 96 smbsr_error(sr, NT_STATUS_INVALID_HANDLE, 97 ERRDOS, ERRbadfid); 98 /* NOTREACHED */ 99 } 100 101 smb_flush_file(sr, sr->fid_ofile); 102 } else { 103 flist = &sr->tid_tree->t_ofile_list; 104 smb_llist_enter(flist, RW_READER); 105 file = smb_llist_head(flist); 106 while (file) { 107 mutex_enter(&file->f_mutex); 108 smb_flush_file(sr, file); 109 mutex_exit(&file->f_mutex); 110 file = smb_llist_next(flist, file); 111 } 112 smb_llist_exit(flist); 113 } 114 smbsr_encode_empty_result(sr); 115 return (SDRC_NORMAL_REPLY); 116 } 117 118 119 /* 120 * smb_flush_file 121 * 122 * If writes on this file are not synchronous, flush it using the NFSv3 123 * commit interface. 124 */ 125 static void smb_flush_file(struct smb_request *sr, struct smb_ofile *ofile) 126 { 127 if ((ofile->f_node->flags & NODE_FLAGS_WRITE_THROUGH) == 0) 128 (void) smb_fsop_commit(sr, sr->user_cr, ofile->f_node); 129 } 130