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36 * @(#)bt_put.c 8.8 (Berkeley) 7/26/94
39 #include <sys/types.h>
49 static EPG *bt_fast __P((BTREE *, const DBT *, const DBT *, int *));
52 * __BT_PUT -- Add a btree item to the tree.
55 * dbp: pointer to access method
61 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key is already in the
62 * tree and R_NOOVERWRITE specified.
65 __bt_put(dbp, key, data, flags)
75 indx_t index, nxtindex;
78 int dflags, exact, status;
79 char *dest, db[NOVFLSIZE], kb[NOVFLSIZE];
83 /* Toss any page pinned across calls. */
84 if (t->bt_pinned != NULL) {
85 mpool_put(t->bt_mp, t->bt_pinned, 0);
89 /* Check for change to a read-only tree. */
90 if (F_ISSET(t, B_RDONLY)) {
101 * If flags is R_CURSOR, put the cursor. Must already
102 * have started a scan and not have already deleted it.
104 if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
105 !F_ISSET(&t->bt_cursor,
106 CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE))
115 * If the key/data pair won't fit on a page, store it on overflow
116 * pages. Only put the key on the overflow page if the pair are
117 * still too big after moving the data to an overflow page.
120 * If the insert fails later on, the overflow pages aren't recovered.
123 if (key->size + data->size > t->bt_ovflsize) {
124 if (key->size > t->bt_ovflsize) {
125 storekey: if (__ovfl_put(t, key, &pg) == RET_ERROR)
128 tkey.size = NOVFLSIZE;
129 memmove(kb, &pg, sizeof(pgno_t));
130 memmove(kb + sizeof(pgno_t),
131 &key->size, sizeof(u_int32_t));
135 if (key->size + data->size > t->bt_ovflsize) {
136 if (__ovfl_put(t, data, &pg) == RET_ERROR)
139 tdata.size = NOVFLSIZE;
140 memmove(db, &pg, sizeof(pgno_t));
141 memmove(db + sizeof(pgno_t),
142 &data->size, sizeof(u_int32_t));
146 if (key->size + data->size > t->bt_ovflsize)
150 /* Replace the cursor. */
151 if (flags == R_CURSOR) {
152 if ((h = mpool_get(t->bt_mp, t->bt_cursor.pg.pgno, 0)) == NULL)
154 index = t->bt_cursor.pg.index;
159 * Find the key to delete, or, the location at which to insert.
160 * Bt_fast and __bt_search both pin the returned page.
162 if (t->bt_order == NOT || (e = bt_fast(t, key, data, &exact)) == NULL)
163 if ((e = __bt_search(t, key, &exact)) == NULL)
169 * Add the key/data pair to the tree. If an identical key is already
170 * in the tree, and R_NOOVERWRITE is set, an error is returned. If
171 * R_NOOVERWRITE is not set, the key is either added (if duplicates are
172 * permitted) or an error is returned.
178 mpool_put(t->bt_mp, h, 0);
179 return (RET_SPECIAL);
181 if (!exact || !F_ISSET(t, B_NODUPS))
185 * Note, the delete may empty the page, so we need to put a
186 * new entry into the page immediately.
188 delete: if (__bt_dleaf(t, key, h, index) == RET_ERROR) {
189 mpool_put(t->bt_mp, h, 0);
196 * If not enough room, or the user has put a ceiling on the number of
197 * keys permitted in the page, split the page. The split code will
198 * insert the key and data and unpin the current page. If inserting
199 * into the offset array, shift the pointers up.
201 nbytes = NBLEAFDBT(key->size, data->size);
202 if (h->upper - h->lower < nbytes + sizeof(indx_t)) {
203 if ((status = __bt_split(t, h, key,
204 data, dflags, nbytes, index)) != RET_SUCCESS)
209 if (index < (nxtindex = NEXTINDEX(h)))
210 memmove(h->linp + index + 1, h->linp + index,
211 (nxtindex - index) * sizeof(indx_t));
212 h->lower += sizeof(indx_t);
214 h->linp[index] = h->upper -= nbytes;
215 dest = (char *)h + h->upper;
216 WR_BLEAF(dest, key, data, dflags);
218 /* If the cursor is on this page, adjust it as necessary. */
219 if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
220 !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
221 t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index >= index)
222 ++t->bt_cursor.pg.index;
224 if (t->bt_order == NOT)
225 if (h->nextpg == P_INVALID) {
226 if (index == NEXTINDEX(h) - 1) {
227 t->bt_order = FORWARD;
228 t->bt_last.index = index;
229 t->bt_last.pgno = h->pgno;
231 } else if (h->prevpg == P_INVALID) {
234 t->bt_last.index = 0;
235 t->bt_last.pgno = h->pgno;
239 mpool_put(t->bt_mp, h, MPOOL_DIRTY);
242 if (flags == R_SETCURSOR)
243 __bt_setcur(t, e->page->pgno, e->index);
245 F_SET(t, B_MODIFIED);
246 return (RET_SUCCESS);
250 u_long bt_cache_hit, bt_cache_miss;
254 * BT_FAST -- Do a quick check for sorted data.
261 * EPG for new record or NULL if not found.
264 bt_fast(t, key, data, exactp)
266 const DBT *key, *data;
273 if ((h = mpool_get(t->bt_mp, t->bt_last.pgno, 0)) == NULL) {
278 t->bt_cur.index = t->bt_last.index;
281 * If won't fit in this page or have too many keys in this page,
282 * have to search to get split stack.
284 nbytes = NBLEAFDBT(key->size, data->size);
285 if (h->upper - h->lower < nbytes + sizeof(indx_t))
288 if (t->bt_order == FORWARD) {
289 if (t->bt_cur.page->nextpg != P_INVALID)
291 if (t->bt_cur.index != NEXTINDEX(h) - 1)
293 if ((cmp = __bt_cmp(t, key, &t->bt_cur)) < 0)
295 t->bt_last.index = cmp ? ++t->bt_cur.index : t->bt_cur.index;
297 if (t->bt_cur.page->prevpg != P_INVALID)
299 if (t->bt_cur.index != 0)
301 if ((cmp = __bt_cmp(t, key, &t->bt_cur)) > 0)
303 t->bt_last.index = 0;
316 mpool_put(t->bt_mp, h, 0);