1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)rec_put.c 8.7 (Berkeley) 8/18/94"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/types.h> 37 38 #include <errno.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 43 #include <db.h> 44 #include "recno.h" 45 46 /* 47 * __REC_PUT -- Add a recno item to the tree. 48 * 49 * Parameters: 50 * dbp: pointer to access method 51 * key: key 52 * data: data 53 * flag: R_CURSOR, R_IAFTER, R_IBEFORE, R_NOOVERWRITE 54 * 55 * Returns: 56 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is 57 * already in the tree and R_NOOVERWRITE specified. 58 */ 59 int 60 __rec_put(const DB *dbp, DBT *key, const DBT *data, u_int flags) 61 { 62 BTREE *t; 63 DBT fdata, tdata; 64 recno_t nrec; 65 int status; 66 67 t = dbp->internal; 68 69 /* Toss any page pinned across calls. */ 70 if (t->bt_pinned != NULL) { 71 mpool_put(t->bt_mp, t->bt_pinned, 0); 72 t->bt_pinned = NULL; 73 } 74 75 /* 76 * If using fixed-length records, and the record is long, return 77 * EINVAL. If it's short, pad it out. Use the record data return 78 * memory, it's only short-term. 79 */ 80 if (F_ISSET(t, R_FIXLEN) && data->size != t->bt_reclen) { 81 if (data->size > t->bt_reclen) 82 goto einval; 83 84 if (t->bt_rdata.size < t->bt_reclen) { 85 t->bt_rdata.data = 86 reallocf(t->bt_rdata.data, t->bt_reclen); 87 if (t->bt_rdata.data == NULL) 88 return (RET_ERROR); 89 t->bt_rdata.size = t->bt_reclen; 90 } 91 memmove(t->bt_rdata.data, data->data, data->size); 92 memset((char *)t->bt_rdata.data + data->size, 93 t->bt_bval, t->bt_reclen - data->size); 94 fdata.data = t->bt_rdata.data; 95 fdata.size = t->bt_reclen; 96 } else { 97 fdata.data = data->data; 98 fdata.size = data->size; 99 } 100 101 switch (flags) { 102 case R_CURSOR: 103 if (!F_ISSET(&t->bt_cursor, CURS_INIT)) 104 goto einval; 105 nrec = t->bt_cursor.rcursor; 106 break; 107 case R_SETCURSOR: 108 if ((nrec = *(recno_t *)key->data) == 0) 109 goto einval; 110 break; 111 case R_IAFTER: 112 if ((nrec = *(recno_t *)key->data) == 0) { 113 nrec = 1; 114 flags = R_IBEFORE; 115 } 116 break; 117 case 0: 118 case R_IBEFORE: 119 if ((nrec = *(recno_t *)key->data) == 0) 120 goto einval; 121 break; 122 case R_NOOVERWRITE: 123 if ((nrec = *(recno_t *)key->data) == 0) 124 goto einval; 125 if (nrec <= t->bt_nrecs) 126 return (RET_SPECIAL); 127 break; 128 default: 129 einval: errno = EINVAL; 130 return (RET_ERROR); 131 } 132 133 /* 134 * Make sure that records up to and including the put record are 135 * already in the database. If skipping records, create empty ones. 136 */ 137 if (nrec > t->bt_nrecs) { 138 if (!F_ISSET(t, R_EOF | R_INMEM) && 139 t->bt_irec(t, nrec) == RET_ERROR) 140 return (RET_ERROR); 141 if (nrec > t->bt_nrecs + 1) { 142 if (F_ISSET(t, R_FIXLEN)) { 143 if ((tdata.data = malloc(t->bt_reclen)) == NULL) 144 return (RET_ERROR); 145 tdata.size = t->bt_reclen; 146 memset(tdata.data, t->bt_bval, tdata.size); 147 } else { 148 tdata.data = NULL; 149 tdata.size = 0; 150 } 151 while (nrec > t->bt_nrecs + 1) 152 if (__rec_iput(t, 153 t->bt_nrecs, &tdata, 0) != RET_SUCCESS) 154 return (RET_ERROR); 155 if (F_ISSET(t, R_FIXLEN)) 156 free(tdata.data); 157 } 158 } 159 160 if ((status = __rec_iput(t, nrec - 1, &fdata, flags)) != RET_SUCCESS) 161 return (status); 162 163 switch (flags) { 164 case R_IAFTER: 165 nrec++; 166 break; 167 case R_SETCURSOR: 168 t->bt_cursor.rcursor = nrec; 169 break; 170 } 171 172 F_SET(t, R_MODIFIED); 173 return (__rec_ret(t, NULL, nrec, key, NULL)); 174 } 175 176 /* 177 * __REC_IPUT -- Add a recno item to the tree. 178 * 179 * Parameters: 180 * t: tree 181 * nrec: record number 182 * data: data 183 * 184 * Returns: 185 * RET_ERROR, RET_SUCCESS 186 */ 187 int 188 __rec_iput(BTREE *t, recno_t nrec, const DBT *data, u_int flags) 189 { 190 DBT tdata; 191 EPG *e; 192 PAGE *h; 193 indx_t idx, nxtindex; 194 pgno_t pg; 195 u_int32_t nbytes; 196 int dflags, status; 197 char *dest, db[NOVFLSIZE]; 198 199 /* 200 * If the data won't fit on a page, store it on indirect pages. 201 * 202 * XXX 203 * If the insert fails later on, these pages aren't recovered. 204 */ 205 if (data->size > t->bt_ovflsize) { 206 if (__ovfl_put(t, data, &pg) == RET_ERROR) 207 return (RET_ERROR); 208 tdata.data = db; 209 tdata.size = NOVFLSIZE; 210 memcpy(db, &pg, sizeof(pg)); 211 *(u_int32_t *)(db + sizeof(pgno_t)) = data->size; 212 dflags = P_BIGDATA; 213 data = &tdata; 214 } else 215 dflags = 0; 216 217 /* __rec_search pins the returned page. */ 218 if ((e = __rec_search(t, nrec, 219 nrec > t->bt_nrecs || flags == R_IAFTER || flags == R_IBEFORE ? 220 SINSERT : SEARCH)) == NULL) 221 return (RET_ERROR); 222 223 h = e->page; 224 idx = e->index; 225 226 /* 227 * Add the specified key/data pair to the tree. The R_IAFTER and 228 * R_IBEFORE flags insert the key after/before the specified key. 229 * 230 * Pages are split as required. 231 */ 232 switch (flags) { 233 case R_IAFTER: 234 ++idx; 235 break; 236 case R_IBEFORE: 237 break; 238 default: 239 if (nrec < t->bt_nrecs && 240 __rec_dleaf(t, h, idx) == RET_ERROR) { 241 mpool_put(t->bt_mp, h, 0); 242 return (RET_ERROR); 243 } 244 break; 245 } 246 247 /* 248 * If not enough room, split the page. The split code will insert 249 * the key and data and unpin the current page. If inserting into 250 * the offset array, shift the pointers up. 251 */ 252 nbytes = NRLEAFDBT(data->size); 253 if ((u_int32_t)(h->upper - h->lower) < nbytes + sizeof(indx_t)) { 254 status = __bt_split(t, h, NULL, data, dflags, nbytes, idx); 255 if (status == RET_SUCCESS) 256 ++t->bt_nrecs; 257 return (status); 258 } 259 260 if (idx < (nxtindex = NEXTINDEX(h))) 261 memmove(h->linp + idx + 1, h->linp + idx, 262 (nxtindex - idx) * sizeof(indx_t)); 263 h->lower += sizeof(indx_t); 264 265 h->linp[idx] = h->upper -= nbytes; 266 dest = (char *)h + h->upper; 267 WR_RLEAF(dest, data, dflags); 268 269 ++t->bt_nrecs; 270 F_SET(t, B_MODIFIED); 271 mpool_put(t->bt_mp, h, MPOOL_DIRTY); 272 273 return (RET_SUCCESS); 274 } 275