1 /* $OpenBSD: rec_close.c,v 1.13 2016/09/21 04:38:56 guenther Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/uio.h> 34 #include <sys/mman.h> 35 36 #include <errno.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <unistd.h> 40 41 #include <db.h> 42 #include "recno.h" 43 44 /* 45 * __REC_CLOSE -- Close a recno tree. 46 * 47 * Parameters: 48 * dbp: pointer to access method 49 * 50 * Returns: 51 * RET_ERROR, RET_SUCCESS 52 */ 53 int 54 __rec_close(DB *dbp) 55 { 56 BTREE *t; 57 int status; 58 59 t = dbp->internal; 60 61 /* Toss any page pinned across calls. */ 62 if (t->bt_pinned != NULL) { 63 mpool_put(t->bt_mp, t->bt_pinned, 0); 64 t->bt_pinned = NULL; 65 } 66 67 if (__rec_sync(dbp, 0) == RET_ERROR) 68 return (RET_ERROR); 69 70 /* Committed to closing. */ 71 status = RET_SUCCESS; 72 73 if (!F_ISSET(t, R_INMEM)) { 74 if (F_ISSET(t, R_CLOSEFP)) { 75 if (fclose(t->bt_rfp)) 76 status = RET_ERROR; 77 } else { 78 if (close(t->bt_rfd)) 79 status = RET_ERROR; 80 } 81 } 82 83 if (__bt_close(dbp) == RET_ERROR) 84 status = RET_ERROR; 85 86 return (status); 87 } 88 89 /* 90 * __REC_SYNC -- sync the recno tree to disk. 91 * 92 * Parameters: 93 * dbp: pointer to access method 94 * 95 * Returns: 96 * RET_SUCCESS, RET_ERROR. 97 */ 98 int 99 __rec_sync(const DB *dbp, u_int flags) 100 { 101 struct iovec iov[2]; 102 BTREE *t; 103 DBT data, key; 104 off_t off; 105 recno_t scursor, trec; 106 int status; 107 108 t = dbp->internal; 109 110 /* Toss any page pinned across calls. */ 111 if (t->bt_pinned != NULL) { 112 mpool_put(t->bt_mp, t->bt_pinned, 0); 113 t->bt_pinned = NULL; 114 } 115 116 if (flags == R_RECNOSYNC) 117 return (__bt_sync(dbp, 0)); 118 119 if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED)) 120 return (RET_SUCCESS); 121 122 /* Read any remaining records into the tree. */ 123 if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR) 124 return (RET_ERROR); 125 126 /* Rewind the file descriptor. */ 127 if (lseek(t->bt_rfd, 0, SEEK_SET) != 0) 128 return (RET_ERROR); 129 130 /* Save the cursor. */ 131 scursor = t->bt_cursor.rcursor; 132 133 key.size = sizeof(recno_t); 134 key.data = &trec; 135 136 if (F_ISSET(t, R_FIXLEN)) { 137 /* 138 * We assume that fixed length records are all fixed length. 139 * Any that aren't are either EINVAL'd or corrected by the 140 * record put code. 141 */ 142 status = (dbp->seq)(dbp, &key, &data, R_FIRST); 143 while (status == RET_SUCCESS) { 144 if (write(t->bt_rfd, data.data, data.size) != data.size) 145 return (RET_ERROR); 146 status = (dbp->seq)(dbp, &key, &data, R_NEXT); 147 } 148 } else { 149 iov[1].iov_base = &t->bt_bval; 150 iov[1].iov_len = 1; 151 152 status = (dbp->seq)(dbp, &key, &data, R_FIRST); 153 while (status == RET_SUCCESS) { 154 iov[0].iov_base = data.data; 155 iov[0].iov_len = data.size; 156 if (writev(t->bt_rfd, iov, 2) != data.size + 1) 157 return (RET_ERROR); 158 status = (dbp->seq)(dbp, &key, &data, R_NEXT); 159 } 160 } 161 162 /* Restore the cursor. */ 163 t->bt_cursor.rcursor = scursor; 164 165 if (status == RET_ERROR) 166 return (RET_ERROR); 167 if ((off = lseek(t->bt_rfd, 0, SEEK_CUR)) == -1) 168 return (RET_ERROR); 169 if (ftruncate(t->bt_rfd, off)) 170 return (RET_ERROR); 171 F_CLR(t, R_MODIFIED); 172 return (RET_SUCCESS); 173 } 174