1/* $NetBSD: rec_put.c,v 1.20 2013/12/01 00:22:48 christos 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#if HAVE_NBTOOL_CONFIG_H 33#include "nbtool_config.h" 34#endif 35 36#include <sys/cdefs.h> 37__RCSID("$NetBSD: rec_put.c,v 1.20 2013/12/01 00:22:48 christos Exp $"); 38 39#include "namespace.h" 40#include <sys/types.h> 41 42#include <assert.h> 43#include <errno.h> 44#include <stdio.h> 45#include <stdlib.h> 46#include <string.h> 47 48#include <db.h> 49#include "recno.h" 50 51/* 52 * __REC_PUT -- Add a recno item to the tree. 53 * 54 * Parameters: 55 * dbp: pointer to access method 56 * key: key 57 * data: data 58 * flag: R_CURSOR, R_IAFTER, R_IBEFORE, R_NOOVERWRITE 59 * 60 * Returns: 61 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is 62 * already in the tree and R_NOOVERWRITE specified. 63 */ 64int 65__rec_put(const DB *dbp, DBT *key, const DBT *data, u_int flags) 66{ 67 BTREE *t; 68 DBT fdata, tdata; 69 recno_t nrec; 70 int status; 71 72 t = dbp->internal; 73 74 /* Toss any page pinned across calls. */ 75 if (t->bt_pinned != NULL) { 76 mpool_put(t->bt_mp, t->bt_pinned, 0); 77 t->bt_pinned = NULL; 78 } 79 80 /* 81 * If using fixed-length records, and the record is long, return 82 * EINVAL. If it's short, pad it out. Use the record data return 83 * memory, it's only short-term. 84 */ 85 if (F_ISSET(t, R_FIXLEN) && data->size != t->bt_reclen) { 86 if (data->size > t->bt_reclen) 87 goto einval; 88 89 if (t->bt_rdata.size < t->bt_reclen) { 90 void *np = realloc(t->bt_rdata.data, t->bt_reclen); 91 if (np == NULL) 92 return (RET_ERROR); 93 t->bt_rdata.data = np; 94 t->bt_rdata.size = t->bt_reclen; 95 } 96 memmove(t->bt_rdata.data, data->data, data->size); 97 memset((char *)t->bt_rdata.data + data->size, 98 t->bt_bval, t->bt_reclen - data->size); 99 fdata.data = t->bt_rdata.data; 100 fdata.size = t->bt_reclen; 101 } else { 102 fdata.data = data->data; 103 fdata.size = data->size; 104 } 105 106 switch (flags) { 107 case R_CURSOR: 108 if (!F_ISSET(&t->bt_cursor, CURS_INIT)) 109 goto einval; 110 nrec = t->bt_cursor.rcursor; 111 break; 112 case R_SETCURSOR: 113 if ((nrec = *(recno_t *)key->data) == 0) 114 goto einval; 115 break; 116 case R_IAFTER: 117 if ((nrec = *(recno_t *)key->data) == 0) { 118 nrec = 1; 119 flags = R_IBEFORE; 120 } 121 break; 122 case 0: 123 case R_IBEFORE: 124 if ((nrec = *(recno_t *)key->data) == 0) 125 goto einval; 126 break; 127 case R_NOOVERWRITE: 128 if ((nrec = *(recno_t *)key->data) == 0) 129 goto einval; 130 if (nrec <= t->bt_nrecs) 131 return (RET_SPECIAL); 132 break; 133 default: 134einval: errno = EINVAL; 135 return (RET_ERROR); 136 } 137 138 /* 139 * Make sure that records up to and including the put record are 140 * already in the database. If skipping records, create empty ones. 141 */ 142 if (nrec > t->bt_nrecs) { 143 if (!F_ISSET(t, R_EOF | R_INMEM) && 144 t->bt_irec(t, nrec) == RET_ERROR) 145 return (RET_ERROR); 146 if (nrec > t->bt_nrecs + 1) { 147 if (F_ISSET(t, R_FIXLEN)) { 148 if ((tdata.data = malloc(t->bt_reclen)) == NULL) 149 return (RET_ERROR); 150 tdata.size = t->bt_reclen; 151 memset(tdata.data, t->bt_bval, tdata.size); 152 } else { 153 tdata.data = NULL; 154 tdata.size = 0; 155 } 156 while (nrec > t->bt_nrecs + 1) 157 if (__rec_iput(t, 158 t->bt_nrecs, &tdata, 0) != RET_SUCCESS) 159 return (RET_ERROR); 160 if (F_ISSET(t, R_FIXLEN)) 161 free(tdata.data); 162 } 163 } 164 165 if ((status = __rec_iput(t, nrec - 1, &fdata, flags)) != RET_SUCCESS) 166 return (status); 167 168 switch (flags) { 169 case R_IAFTER: 170 nrec++; 171 break; 172 case R_SETCURSOR: 173 t->bt_cursor.rcursor = nrec; 174 break; 175 } 176 177 F_SET(t, R_MODIFIED); 178 return (__rec_ret(t, NULL, nrec, key, NULL)); 179} 180 181/* 182 * __REC_IPUT -- Add a recno item to the tree. 183 * 184 * Parameters: 185 * t: tree 186 * nrec: record number 187 * data: data 188 * 189 * Returns: 190 * RET_ERROR, RET_SUCCESS 191 */ 192int 193__rec_iput(BTREE *t, recno_t nrec, const DBT *data, u_int flags) 194{ 195 DBT tdata; 196 EPG *e; 197 PAGE *h; 198 indx_t idx, nxtindex; 199 pgno_t pg; 200 uint32_t nbytes; 201 int dflags, status; 202 char *dest, db[NOVFLSIZE]; 203 204 /* 205 * If the data won't fit on a page, store it on indirect pages. 206 * 207 * XXX 208 * If the insert fails later on, these pages aren't recovered. 209 */ 210 if (data->size > t->bt_ovflsize) { 211 if (__ovfl_put(t, data, &pg) == RET_ERROR) 212 return (RET_ERROR); 213 tdata.data = db; 214 tdata.size = NOVFLSIZE; 215 memcpy(db, &pg, sizeof(pg)); 216 _DBFIT(data->size, uint32_t); 217 *(uint32_t *)(void *)(db + sizeof(pgno_t)) = 218 (uint32_t)data->size; 219 dflags = P_BIGDATA; 220 data = &tdata; 221 } else 222 dflags = 0; 223 224 /* __rec_search pins the returned page. */ 225 if ((e = __rec_search(t, nrec, 226 nrec > t->bt_nrecs || flags == R_IAFTER || flags == R_IBEFORE ? 227 SINSERT : SEARCH)) == NULL) 228 return (RET_ERROR); 229 230 h = e->page; 231 idx = e->index; 232 233 /* 234 * Add the specified key/data pair to the tree. The R_IAFTER and 235 * R_IBEFORE flags insert the key after/before the specified key. 236 * 237 * Pages are split as required. 238 */ 239 switch (flags) { 240 case R_IAFTER: 241 ++idx; 242 break; 243 case R_IBEFORE: 244 break; 245 default: 246 if (nrec < t->bt_nrecs && 247 __rec_dleaf(t, h, (uint32_t)idx) == RET_ERROR) { 248 mpool_put(t->bt_mp, h, 0); 249 return (RET_ERROR); 250 } 251 break; 252 } 253 254 /* 255 * If not enough room, split the page. The split code will insert 256 * the key and data and unpin the current page. If inserting into 257 * the offset array, shift the pointers up. 258 */ 259 nbytes = NRLEAFDBT(data->size); 260 if ((uint32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t)) { 261 status = __bt_split(t, h, NULL, data, dflags, nbytes, 262 (uint32_t)idx); 263 if (status == RET_SUCCESS) 264 ++t->bt_nrecs; 265 return (status); 266 } 267 268 if (idx < (nxtindex = NEXTINDEX(h))) 269 memmove(h->linp + idx + 1, h->linp + idx, 270 (nxtindex - idx) * sizeof(indx_t)); 271 h->lower += sizeof(indx_t); 272 273 h->linp[idx] = h->upper -= nbytes; 274 dest = (char *)(void *)h + h->upper; 275 WR_RLEAF(dest, data, dflags); 276 277 ++t->bt_nrecs; 278 F_SET(t, B_MODIFIED); 279 mpool_put(t->bt_mp, h, MPOOL_DIRTY); 280 281 return (RET_SUCCESS); 282} 283