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 * smb_com_flush 49 * 50 * Flush any cached data for a specified file, or for all files that 51 * this client has open, to stable storage. If the fid is valid (i.e. 52 * not 0xFFFF), we flush only that file. Otherwise we flush all files 53 * associated with this client. 54 * 55 * We need to protect the list because there's a good chance we'll 56 * block during the flush operation. 57 */ 58 smb_sdrc_t 59 smb_pre_flush(smb_request_t *sr) 60 { 61 int rc; 62 63 rc = smbsr_decode_vwv(sr, "w", &sr->smb_fid); 64 65 DTRACE_SMB_1(op__Flush__start, smb_request_t *, sr); 66 67 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR); 68 } 69 70 void 71 smb_post_flush(smb_request_t *sr) 72 { 73 DTRACE_SMB_1(op__Flush__done, smb_request_t *, sr); 74 } 75 76 smb_sdrc_t 77 smb_com_flush(smb_request_t *sr) 78 { 79 smb_ofile_t *file; 80 smb_llist_t *flist; 81 int rc; 82 83 if (smb_flush_required == 0) { 84 rc = smbsr_encode_empty_result(sr); 85 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR); 86 } 87 88 if (sr->smb_fid != 0xffff) { 89 sr->fid_ofile = smb_ofile_lookup_by_fid(sr->tid_tree, 90 sr->smb_fid); 91 if (sr->fid_ofile == NULL) { 92 smbsr_error(sr, NT_STATUS_INVALID_HANDLE, 93 ERRDOS, ERRbadfid); 94 return (SDRC_ERROR); 95 } 96 97 smb_flush_file(sr, sr->fid_ofile); 98 } else { 99 flist = &sr->tid_tree->t_ofile_list; 100 smb_llist_enter(flist, RW_READER); 101 file = smb_llist_head(flist); 102 while (file) { 103 mutex_enter(&file->f_mutex); 104 smb_flush_file(sr, file); 105 mutex_exit(&file->f_mutex); 106 file = smb_llist_next(flist, file); 107 } 108 smb_llist_exit(flist); 109 } 110 111 rc = smbsr_encode_empty_result(sr); 112 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR); 113 } 114 115 116 /* 117 * smb_flush_file 118 * 119 * If writes on this file are not synchronous, flush it using the NFSv3 120 * commit interface. 121 */ 122 static void 123 smb_flush_file(struct smb_request *sr, struct smb_ofile *ofile) 124 { 125 if ((ofile->f_node->flags & NODE_FLAGS_WRITE_THROUGH) == 0) 126 (void) smb_fsop_commit(sr, sr->user_cr, ofile->f_node); 127 } 128