2 * Copyright (c) 1990, 1993, 1994
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5 * This code is derived from software contributed to Berkeley by
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37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)bt_put.c 8.8 (Berkeley) 7/26/94";
39 #endif /* LIBC_SCCS and not lint */
41 #include <sys/types.h>
51 static EPG *bt_fast __P((BTREE *, const DBT *, const DBT *, int *));
54 * __BT_PUT -- Add a btree item to the tree.
57 * dbp: pointer to access method
63 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is already in the
64 * tree and R_NOOVERWRITE specified.
67 __bt_put(dbp, key, data, flags)
80 int dflags, exact, status;
81 char *dest, db[NOVFLSIZE], kb[NOVFLSIZE];
85 /* Toss any page pinned across calls. */
86 if (t->bt_pinned != NULL) {
87 mpool_put(t->bt_mp, t->bt_pinned, 0);
91 /* Check for change to a read-only tree. */
92 if (F_ISSET(t, B_RDONLY)) {
103 * If flags is R_CURSOR, put the cursor. Must already
104 * have started a scan and not have already deleted it.
106 if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
107 !F_ISSET(&t->bt_cursor,
108 CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE))
117 * If the key/data pair won't fit on a page, store it on overflow
118 * pages. Only put the key on the overflow page if the pair are
119 * still too big after moving the data to an overflow page.
122 * If the insert fails later on, the overflow pages aren't recovered.
125 if (key->size + data->size > t->bt_ovflsize) {
126 if (key->size > t->bt_ovflsize) {
127 u_int32_t yuck_this_is_gross_code;
128 storekey: if (__ovfl_put(t, key, &pg) == RET_ERROR)
131 tkey.size = NOVFLSIZE;
132 memmove(kb, &pg, sizeof(db_pgno_t));
133 yuck_this_is_gross_code = key->size;
134 if (yuck_this_is_gross_code != key->size)
136 memmove(kb + sizeof(db_pgno_t),
137 &yuck_this_is_gross_code, sizeof(u_int32_t));
141 if (key->size + data->size > t->bt_ovflsize) {
142 u_int32_t yuck_this_is_gross_code = data->size;
143 if (__ovfl_put(t, data, &pg) == RET_ERROR)
146 tdata.size = NOVFLSIZE;
147 memmove(db, &pg, sizeof(db_pgno_t));
148 if (yuck_this_is_gross_code != data->size)
150 memmove(db + sizeof(db_pgno_t),
151 &yuck_this_is_gross_code, sizeof(u_int32_t));
155 if (key->size + data->size > t->bt_ovflsize)
159 /* Replace the cursor. */
160 if (flags == R_CURSOR) {
161 if ((h = mpool_get(t->bt_mp, t->bt_cursor.pg.pgno, 0)) == NULL)
163 idx = t->bt_cursor.pg.index;
168 * Find the key to delete, or, the location at which to insert.
169 * Bt_fast and __bt_search both pin the returned page.
171 if (t->bt_order == NOT || (e = bt_fast(t, key, data, &exact)) == NULL)
172 if ((e = __bt_search(t, key, &exact)) == NULL)
178 * Add the key/data pair to the tree. If an identical key is already
179 * in the tree, and R_NOOVERWRITE is set, an error is returned. If
180 * R_NOOVERWRITE is not set, the key is either added (if duplicates are
181 * permitted) or an error is returned.
187 mpool_put(t->bt_mp, h, 0);
188 return (RET_SPECIAL);
190 if (!exact || !F_ISSET(t, B_NODUPS))
194 * Note, the delete may empty the page, so we need to put a
195 * new entry into the page immediately.
197 delete: if (__bt_dleaf(t, key, h, idx) == RET_ERROR) {
198 mpool_put(t->bt_mp, h, 0);
205 * If not enough room, or the user has put a ceiling on the number of
206 * keys permitted in the page, split the page. The split code will
207 * insert the key and data and unpin the current page. If inserting
208 * into the offset array, shift the pointers up.
210 nbytes = NBLEAFDBT(key->size, data->size);
211 if (h->upper - h->lower < nbytes + sizeof(indx_t)) {
212 if ((status = __bt_split(t, h, key,
213 data, dflags, nbytes, idx)) != RET_SUCCESS)
218 if (idx < (nxtindex = NEXTINDEX(h)))
219 memmove(h->linp + idx + 1, h->linp + idx,
220 (nxtindex - idx) * sizeof(indx_t));
221 h->lower += sizeof(indx_t);
223 h->linp[idx] = h->upper -= nbytes;
224 dest = (char *)h + h->upper;
225 WR_BLEAF(dest, key, data, dflags);
227 /* If the cursor is on this page, adjust it as necessary. */
228 if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
229 !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
230 t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index >= idx)
231 ++t->bt_cursor.pg.index;
233 if (t->bt_order == NOT) {
234 if (h->nextpg == P_INVALID) {
235 if (idx == NEXTINDEX(h) - 1) {
236 t->bt_order = FORWARD;
237 t->bt_last.index = idx;
238 t->bt_last.pgno = h->pgno;
240 } else if (h->prevpg == P_INVALID) {
243 t->bt_last.index = 0;
244 t->bt_last.pgno = h->pgno;
249 mpool_put(t->bt_mp, h, MPOOL_DIRTY);
252 if (flags == R_SETCURSOR)
253 __bt_setcur(t, e->page->pgno, e->index);
255 F_SET(t, B_MODIFIED);
256 return (RET_SUCCESS);
260 u_long bt_cache_hit, bt_cache_miss;
264 * BT_FAST -- Do a quick check for sorted data.
271 * EPG for new record or NULL if not found.
274 bt_fast(t, key, data, exactp)
276 const DBT *key, *data;
283 if ((h = mpool_get(t->bt_mp, t->bt_last.pgno, 0)) == NULL) {
288 t->bt_cur.index = t->bt_last.index;
291 * If won't fit in this page or have too many keys in this page,
292 * have to search to get split stack.
294 nbytes = NBLEAFDBT(key->size, data->size);
295 if (h->upper - h->lower < nbytes + sizeof(indx_t))
298 if (t->bt_order == FORWARD) {
299 if (t->bt_cur.page->nextpg != P_INVALID)
301 if (t->bt_cur.index != NEXTINDEX(h) - 1)
303 if ((cmp = __bt_cmp(t, key, &t->bt_cur)) < 0)
305 t->bt_last.index = cmp ? ++t->bt_cur.index : t->bt_cur.index;
307 if (t->bt_cur.page->prevpg != P_INVALID)
309 if (t->bt_cur.index != 0)
311 if ((cmp = __bt_cmp(t, key, &t->bt_cur)) > 0)
313 t->bt_last.index = 0;
326 mpool_put(t->bt_mp, h, 0);