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      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 2009 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 /*
     27  * The flush SMB is sent to ensure all data and allocation information
     28  * for the corresponding file has been written to stable storage. This
     29  * is a synchronous request. The response should not be sent until the
     30  * writes are complete.
     31  *
     32  * The SmbFlush request is described in CIFS/1.0 1996 Section 3.9.14.
     33  *
     34  * CIFS/1.0 June 13, 1996
     35  * Heizer, et al
     36  * draft-heizer-cifs-v1-spec-00.txt
     37  */
     38 
     39 #include <smbsrv/smb_kproto.h>
     40 #include <smbsrv/smb_fsops.h>
     41 
     42 
     43 static void smb_flush_file(struct smb_request *sr, struct smb_ofile *ofile);
     44 
     45 /*
     46  * smb_com_flush
     47  *
     48  * Flush any cached data for a specified file, or for all files that
     49  * this client has open, to stable storage. If the fid is valid (i.e.
     50  * not 0xFFFF), we flush only that file. Otherwise we flush all files
     51  * associated with this client.
     52  *
     53  * We need to protect the list because there's a good chance we'll
     54  * block during the flush operation.
     55  */
     56 smb_sdrc_t
     57 smb_pre_flush(smb_request_t *sr)
     58 {
     59 	int rc;
     60 
     61 	rc = smbsr_decode_vwv(sr, "w", &sr->smb_fid);
     62 
     63 	DTRACE_SMB_1(op__Flush__start, smb_request_t *, sr);
     64 
     65 	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
     66 }
     67 
     68 void
     69 smb_post_flush(smb_request_t *sr)
     70 {
     71 	DTRACE_SMB_1(op__Flush__done, smb_request_t *, sr);
     72 }
     73 
     74 smb_sdrc_t
     75 smb_com_flush(smb_request_t *sr)
     76 {
     77 	smb_ofile_t	*file;
     78 	smb_llist_t	*flist;
     79 	int		rc;
     80 
     81 	if (smb_flush_required == 0) {
     82 		rc = smbsr_encode_empty_result(sr);
     83 		return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
     84 	}
     85 
     86 	if (sr->smb_fid != 0xffff) {
     87 		smbsr_lookup_file(sr);
     88 		if (sr->fid_ofile == NULL) {
     89 			smbsr_error(sr, NT_STATUS_INVALID_HANDLE,
     90 			    ERRDOS, ERRbadfid);
     91 			return (SDRC_ERROR);
     92 		}
     93 
     94 		smb_flush_file(sr, sr->fid_ofile);
     95 	} else {
     96 		flist = &sr->tid_tree->t_ofile_list;
     97 		smb_llist_enter(flist, RW_READER);
     98 		file = smb_llist_head(flist);
     99 		while (file) {
    100 			mutex_enter(&file->f_mutex);
    101 			smb_flush_file(sr, file);
    102 			mutex_exit(&file->f_mutex);
    103 			file = smb_llist_next(flist, file);
    104 		}
    105 		smb_llist_exit(flist);
    106 	}
    107 
    108 	rc = smbsr_encode_empty_result(sr);
    109 	return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR);
    110 }
    111 
    112 
    113 /*
    114  * smb_flush_file
    115  *
    116  * If writes on this file are not synchronous, flush it using the NFSv3
    117  * commit interface.
    118  */
    119 static void
    120 smb_flush_file(struct smb_request *sr, struct smb_ofile *ofile)
    121 {
    122 	sr->user_cr = smb_ofile_getcred(ofile);
    123 
    124 	if ((ofile->f_node->flags & NODE_FLAGS_WRITE_THROUGH) == 0)
    125 		(void) smb_fsop_commit(sr, sr->user_cr, ofile->f_node);
    126 }
    127