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33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)bt_put.c 8.8 (Berkeley) 7/26/94";
35 #endif /* LIBC_SCCS and not lint */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/types.h>
49 static EPG *bt_fast(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(const DB *dbp, DBT *key, const DBT *data, u_int flags)
73 u_int32_t nbytes, tmp;
74 int dflags, exact, status;
75 char *dest, db[NOVFLSIZE], kb[NOVFLSIZE];
79 /* Toss any page pinned across calls. */
80 if (t->bt_pinned != NULL) {
81 mpool_put(t->bt_mp, t->bt_pinned, 0);
85 /* Check for change to a read-only tree. */
86 if (F_ISSET(t, B_RDONLY)) {
97 * If flags is R_CURSOR, put the cursor. Must already
98 * have started a scan and not have already deleted it.
100 if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
101 !F_ISSET(&t->bt_cursor,
102 CURS_ACQUIRE | CURS_AFTER | CURS_BEFORE))
111 * If the key/data pair won't fit on a page, store it on overflow
112 * pages. Only put the key on the overflow page if the pair are
113 * still too big after moving the data to an overflow page.
116 * If the insert fails later on, the overflow pages aren't recovered.
119 if (key->size + data->size > t->bt_ovflsize) {
120 if (key->size > t->bt_ovflsize) {
121 storekey: if (__ovfl_put(t, key, &pg) == RET_ERROR)
124 tkey.size = NOVFLSIZE;
125 memmove(kb, &pg, sizeof(pgno_t));
127 memmove(kb + sizeof(pgno_t),
128 &tmp, sizeof(u_int32_t));
132 if (key->size + data->size > t->bt_ovflsize) {
133 if (__ovfl_put(t, data, &pg) == RET_ERROR)
136 tdata.size = NOVFLSIZE;
137 memmove(db, &pg, sizeof(pgno_t));
139 memmove(db + sizeof(pgno_t),
140 &tmp, sizeof(u_int32_t));
144 if (key->size + data->size > t->bt_ovflsize)
148 /* Replace the cursor. */
149 if (flags == R_CURSOR) {
150 if ((h = mpool_get(t->bt_mp, t->bt_cursor.pg.pgno, 0)) == NULL)
152 idx = t->bt_cursor.pg.index;
157 * Find the key to delete, or, the location at which to insert.
158 * Bt_fast and __bt_search both pin the returned page.
160 if (t->bt_order == NOT || (e = bt_fast(t, key, data, &exact)) == NULL)
161 if ((e = __bt_search(t, key, &exact)) == NULL)
167 * Add the key/data pair to the tree. If an identical key is already
168 * in the tree, and R_NOOVERWRITE is set, an error is returned. If
169 * R_NOOVERWRITE is not set, the key is either added (if duplicates are
170 * permitted) or an error is returned.
176 mpool_put(t->bt_mp, h, 0);
177 return (RET_SPECIAL);
179 if (!exact || !F_ISSET(t, B_NODUPS))
183 * Note, the delete may empty the page, so we need to put a
184 * new entry into the page immediately.
186 delete: if (__bt_dleaf(t, key, h, idx) == RET_ERROR) {
187 mpool_put(t->bt_mp, h, 0);
194 * If not enough room, or the user has put a ceiling on the number of
195 * keys permitted in the page, split the page. The split code will
196 * insert the key and data and unpin the current page. If inserting
197 * into the offset array, shift the pointers up.
199 nbytes = NBLEAFDBT(key->size, data->size);
200 if ((u_int32_t)(h->upper - h->lower) < nbytes + sizeof(indx_t)) {
201 if ((status = __bt_split(t, h, key,
202 data, dflags, nbytes, idx)) != RET_SUCCESS)
207 if (idx < (nxtindex = NEXTINDEX(h)))
208 memmove(h->linp + idx + 1, h->linp + idx,
209 (nxtindex - idx) * sizeof(indx_t));
210 h->lower += sizeof(indx_t);
212 h->linp[idx] = h->upper -= nbytes;
213 dest = (char *)h + h->upper;
214 WR_BLEAF(dest, key, data, dflags);
216 /* If the cursor is on this page, adjust it as necessary. */
217 if (F_ISSET(&t->bt_cursor, CURS_INIT) &&
218 !F_ISSET(&t->bt_cursor, CURS_ACQUIRE) &&
219 t->bt_cursor.pg.pgno == h->pgno && t->bt_cursor.pg.index >= idx)
220 ++t->bt_cursor.pg.index;
222 if (t->bt_order == NOT) {
223 if (h->nextpg == P_INVALID) {
224 if (idx == NEXTINDEX(h) - 1) {
225 t->bt_order = FORWARD;
226 t->bt_last.index = idx;
227 t->bt_last.pgno = h->pgno;
229 } else if (h->prevpg == P_INVALID) {
232 t->bt_last.index = 0;
233 t->bt_last.pgno = h->pgno;
238 mpool_put(t->bt_mp, h, MPOOL_DIRTY);
241 if (flags == R_SETCURSOR)
242 __bt_setcur(t, e->page->pgno, e->index);
244 F_SET(t, B_MODIFIED);
245 return (RET_SUCCESS);
249 u_long bt_cache_hit, bt_cache_miss;
253 * BT_FAST -- Do a quick check for sorted data.
260 * EPG for new record or NULL if not found.
263 bt_fast(BTREE *t, const DBT *key, const DBT *data, int *exactp)
269 if ((h = mpool_get(t->bt_mp, t->bt_last.pgno, 0)) == NULL) {
274 t->bt_cur.index = t->bt_last.index;
277 * If won't fit in this page or have too many keys in this page,
278 * have to search to get split stack.
280 nbytes = NBLEAFDBT(key->size, data->size);
281 if ((u_int32_t)(h->upper - h->lower) < nbytes + sizeof(indx_t))
284 if (t->bt_order == FORWARD) {
285 if (t->bt_cur.page->nextpg != P_INVALID)
287 if (t->bt_cur.index != NEXTINDEX(h) - 1)
289 if ((cmp = __bt_cmp(t, key, &t->bt_cur)) < 0)
291 t->bt_last.index = cmp ? ++t->bt_cur.index : t->bt_cur.index;
293 if (t->bt_cur.page->prevpg != P_INVALID)
295 if (t->bt_cur.index != 0)
297 if ((cmp = __bt_cmp(t, key, &t->bt_cur)) > 0)
299 t->bt_last.index = 0;
312 mpool_put(t->bt_mp, h, 0);