/* * __REC_GET -- Get a record from the btree. * * Parameters: * dbp: pointer to access method * key: key to find * data: data to return * flag: currently unused * * Returns: * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. */ int __rec_get(const DB *dbp, const DBT *key, DBT *data, unsigned int flags) { BTREE *t; EPG *e; recno_t nrec; int status; t = dbp->internal; /* Toss any page pinned across calls. */ if (t->bt_pinned != NULL) { mpool_put(t->bt_mp, t->bt_pinned, 0); t->bt_pinned = NULL; } /* Get currently doesn't take any flags, and keys of 0 are illegal. */ if (flags || (nrec = *(recno_t *)key->data) == 0) { errno = EINVAL; return (RET_ERROR); } /* * If we haven't seen this record yet, try to find it in the * original file. */ if (nrec > t->bt_nrecs) { if (F_ISSET(t, R_EOF | R_INMEM)) return (RET_SPECIAL); if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS) return (status); } --nrec; if ((e = __rec_search(t, nrec, SEARCH)) == NULL) return (RET_ERROR); status = __rec_ret(t, e, 0, NULL, data); if (F_ISSET(t, B_DB_LOCK)) mpool_put(t->bt_mp, e->page, 0); else t->bt_pinned = e->page; return (status); }
/* * REC_RDELETE -- Delete the data matching the specified key. * * Parameters: * tree: tree * nrec: record to delete * * Returns: * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. */ static int rec_rdelete(BTREE *t, recno_t nrec) { EPG *e; PAGE *h; int status; /* Find the record; __rec_search pins the page. */ if ((e = __rec_search(t, nrec, SDELETE)) == NULL) return (RET_ERROR); /* Delete the record. */ h = e->page; status = __rec_dleaf(t, h, e->index); if (status != RET_SUCCESS) { mpool_put(t->bt_mp, h, 0); return (status); } mpool_put(t->bt_mp, h, MPOOL_DIRTY); return (RET_SUCCESS); }
/* * __REC_SEQ -- Recno sequential scan interface. * * Parameters: * dbp: pointer to access method * key: key for positioning and return value * data: data return value * flags: R_CURSOR, R_FIRST, R_LAST, R_NEXT, R_PREV. * * Returns: * RET_ERROR, RET_SUCCESS or RET_SPECIAL if there's no next key. */ int __rec_seq(const DB *dbp, DBT *key, DBT *data, u_int flags) { BTREE *t; EPG *e; recno_t nrec; int status; t = dbp->internal; /* Toss any page pinned across calls. */ if (t->bt_pinned != NULL) { mpool_put(t->bt_mp, t->bt_pinned, 0); t->bt_pinned = NULL; } switch(flags) { case R_CURSOR: if ((nrec = *(recno_t *)key->data) == 0) goto einval; break; case R_NEXT: if (F_ISSET(&t->bt_cursor, CURS_INIT)) { nrec = t->bt_cursor.rcursor + 1; break; } /* FALLTHROUGH */ case R_FIRST: nrec = 1; break; case R_PREV: if (F_ISSET(&t->bt_cursor, CURS_INIT)) { if ((nrec = t->bt_cursor.rcursor - 1) == 0) return (RET_SPECIAL); break; } /* FALLTHROUGH */ case R_LAST: if (!F_ISSET(t, R_EOF | R_INMEM) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR) return (RET_ERROR); nrec = t->bt_nrecs; break; default: einval: errno = EINVAL; return (RET_ERROR); } if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) { if (!F_ISSET(t, R_EOF | R_INMEM) && (status = t->bt_irec(t, nrec)) != RET_SUCCESS) return (status); if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) return (RET_SPECIAL); } if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL) return (RET_ERROR); F_SET(&t->bt_cursor, CURS_INIT); t->bt_cursor.rcursor = nrec; status = __rec_ret(t, e, nrec, key, data); if (F_ISSET(t, B_DB_LOCK)) mpool_put(t->bt_mp, e->page, 0); else t->bt_pinned = e->page; return (status); }
/* * __REC_IPUT -- Add a recno item to the tree. * * Parameters: * t: tree * nrec: record number * data: data * * Returns: * RET_ERROR, RET_SUCCESS */ int __rec_iput(BTREE *t, recno_t nrec, const DBT *data, u_int flags) { DBT tdata; EPG *e; PAGE *h; indx_t idx, nxtindex; pgno_t pg; uint32_t nbytes; int dflags, status; char *dest, db[NOVFLSIZE]; /* * If the data won't fit on a page, store it on indirect pages. * * XXX * If the insert fails later on, these pages aren't recovered. */ if (data->size > t->bt_ovflsize) { if (__ovfl_put(t, data, &pg) == RET_ERROR) return (RET_ERROR); tdata.data = db; tdata.size = NOVFLSIZE; *(pgno_t *)(void *)db = pg; _DBFIT(data->size, uint32_t); *(uint32_t *)(void *)(db + sizeof(pgno_t)) = (uint32_t)data->size; dflags = P_BIGDATA; data = &tdata; } else dflags = 0; /* __rec_search pins the returned page. */ if ((e = __rec_search(t, nrec, nrec > t->bt_nrecs || flags == R_IAFTER || flags == R_IBEFORE ? SINSERT : SEARCH)) == NULL) return (RET_ERROR); h = e->page; idx = e->index; /* * Add the specified key/data pair to the tree. The R_IAFTER and * R_IBEFORE flags insert the key after/before the specified key. * * Pages are split as required. */ switch (flags) { case R_IAFTER: ++idx; break; case R_IBEFORE: break; default: if (nrec < t->bt_nrecs && __rec_dleaf(t, h, (uint32_t)idx) == RET_ERROR) { mpool_put(t->bt_mp, h, 0); return (RET_ERROR); } break; } /* * If not enough room, split the page. The split code will insert * the key and data and unpin the current page. If inserting into * the offset array, shift the pointers up. */ nbytes = NRLEAFDBT(data->size); if ((uint32_t) (h->upper - h->lower) < nbytes + sizeof(indx_t)) { status = __bt_split(t, h, NULL, data, dflags, nbytes, (uint32_t)idx); if (status == RET_SUCCESS) ++t->bt_nrecs; return (status); } if (idx < (nxtindex = NEXTINDEX(h))) memmove(h->linp + idx + 1, h->linp + idx, (nxtindex - idx) * sizeof(indx_t)); h->lower += sizeof(indx_t); h->linp[idx] = h->upper -= nbytes; dest = (char *)(void *)h + h->upper; WR_RLEAF(dest, data, dflags); ++t->bt_nrecs; F_SET(t, B_MODIFIED); mpool_put(t->bt_mp, h, MPOOL_DIRTY); return (RET_SUCCESS); }