diff options
Diffstat (limited to 'db/btree/bt_put.c')
| -rw-r--r-- | db/btree/bt_put.c | 859 |
1 files changed, 859 insertions, 0 deletions
diff --git a/db/btree/bt_put.c b/db/btree/bt_put.c new file mode 100644 index 000000000..19a04526d --- /dev/null +++ b/db/btree/bt_put.c @@ -0,0 +1,859 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 1997, 1998, 1999, 2000 + * Sleepycat Software. All rights reserved. + */ +/* + * Copyright (c) 1990, 1993, 1994, 1995, 1996 + * Keith Bostic. All rights reserved. + */ +/* + * Copyright (c) 1990, 1993, 1994, 1995 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Mike Olson. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "db_config.h" + +#ifndef lint +static const char revid[] = "$Id: bt_put.c,v 11.46 2001/01/17 18:48:46 bostic Exp $"; +#endif /* not lint */ + +#ifndef NO_SYSTEM_INCLUDES +#include <sys/types.h> + +#include <string.h> +#endif + +#include "db_int.h" +#include "db_page.h" +#include "btree.h" + +static int __bam_dup_convert __P((DBC *, PAGE *, u_int32_t)); +static int __bam_ovput + __P((DBC *, u_int32_t, db_pgno_t, PAGE *, u_int32_t, DBT *)); + +/* + * __bam_iitem -- + * Insert an item into the tree. + * + * PUBLIC: int __bam_iitem __P((DBC *, DBT *, DBT *, u_int32_t, u_int32_t)); + */ +int +__bam_iitem(dbc, key, data, op, flags) + DBC *dbc; + DBT *key, *data; + u_int32_t op, flags; +{ + BKEYDATA *bk, bk_tmp; + BTREE *t; + BTREE_CURSOR *cp; + DB *dbp; + DBT bk_hdr, tdbt; + PAGE *h; + db_indx_t indx; + u_int32_t data_size, have_bytes, need_bytes, needed; + int cmp, bigkey, bigdata, dupadjust, padrec, replace, ret, was_deleted; + + COMPQUIET(bk, NULL); + + dbp = dbc->dbp; + cp = (BTREE_CURSOR *)dbc->internal; + t = dbp->bt_internal; + h = cp->page; + indx = cp->indx; + dupadjust = replace = was_deleted = 0; + + /* + * Fixed-length records with partial puts: it's an error to specify + * anything other simple overwrite. + */ + if (F_ISSET(dbp, DB_RE_FIXEDLEN) && + F_ISSET(data, DB_DBT_PARTIAL) && data->dlen != data->size) { + data_size = data->size; + goto len_err; + } + + /* + * Figure out how much space the data will take, including if it's a + * partial record. + * + * Fixed-length records: it's an error to specify a record that's + * longer than the fixed-length, and we never require less than + * the fixed-length record size. + */ + data_size = F_ISSET(data, DB_DBT_PARTIAL) ? + __bam_partsize(op, data, h, indx) : data->size; + padrec = 0; + if (F_ISSET(dbp, DB_RE_FIXEDLEN)) { + if (data_size > t->re_len) { +len_err: __db_err(dbp->dbenv, + "Length improper for fixed length record %lu", + (u_long)data_size); + return (EINVAL); + } + if (data_size < t->re_len) { + padrec = 1; + data_size = t->re_len; + } + } + + /* + * Handle partial puts or short fixed-length records: build the + * real record. + */ + if (padrec || F_ISSET(data, DB_DBT_PARTIAL)) { + tdbt = *data; + if ((ret = + __bam_build(dbc, op, &tdbt, h, indx, data_size)) != 0) + return (ret); + data = &tdbt; + } + + /* + * If the user has specified a duplicate comparison function, return + * an error if DB_CURRENT was specified and the replacement data + * doesn't compare equal to the current data. This stops apps from + * screwing up the duplicate sort order. We have to do this after + * we build the real record so that we're comparing the real items. + */ + if (op == DB_CURRENT && dbp->dup_compare != NULL) { + if ((ret = __bam_cmp(dbp, data, h, + indx + (TYPE(h) == P_LBTREE ? O_INDX : 0), + dbp->dup_compare, &cmp)) != 0) + return (ret); + if (cmp != 0) { + __db_err(dbp->dbenv, + "Current data differs from put data"); + return (EINVAL); + } + } + + /* + * If the key or data item won't fit on a page, we'll have to store + * them on overflow pages. + */ + needed = 0; + bigdata = data_size > cp->ovflsize; + switch (op) { + case DB_KEYFIRST: + /* We're adding a new key and data pair. */ + bigkey = key->size > cp->ovflsize; + if (bigkey) + needed += BOVERFLOW_PSIZE; + else + needed += BKEYDATA_PSIZE(key->size); + if (bigdata) + needed += BOVERFLOW_PSIZE; + else + needed += BKEYDATA_PSIZE(data_size); + break; + case DB_AFTER: + case DB_BEFORE: + case DB_CURRENT: + /* + * We're either overwriting the data item of a key/data pair + * or we're creating a new on-page duplicate and only adding + * a data item. + * + * !!! + * We're not currently correcting for space reclaimed from + * already deleted items, but I don't think it's worth the + * complexity. + */ + bigkey = 0; + if (op == DB_CURRENT) { + bk = GET_BKEYDATA(h, + indx + (TYPE(h) == P_LBTREE ? O_INDX : 0)); + if (B_TYPE(bk->type) == B_KEYDATA) + have_bytes = BKEYDATA_PSIZE(bk->len); + else + have_bytes = BOVERFLOW_PSIZE; + need_bytes = 0; + } else { + have_bytes = 0; + need_bytes = sizeof(db_indx_t); + } + if (bigdata) + need_bytes += BOVERFLOW_PSIZE; + else + need_bytes += BKEYDATA_PSIZE(data_size); + + if (have_bytes < need_bytes) + needed += need_bytes - have_bytes; + break; + default: + return (__db_unknown_flag(dbp->dbenv, "__bam_iitem", op)); + } + + /* + * If there's not enough room, or the user has put a ceiling on the + * number of keys permitted in the page, split the page. + * + * XXX + * The t->bt_maxkey test here may be insufficient -- do we have to + * check in the btree split code, so we don't undo it there!?!? + */ + if (P_FREESPACE(h) < needed || + (t->bt_maxkey != 0 && NUM_ENT(h) > t->bt_maxkey)) + return (DB_NEEDSPLIT); + + /* + * The code breaks it up into five cases: + * + * 1. Insert a new key/data pair. + * 2. Append a new data item (a new duplicate). + * 3. Insert a new data item (a new duplicate). + * 4. Delete and re-add the data item (overflow item). + * 5. Overwrite the data item. + */ + switch (op) { + case DB_KEYFIRST: /* 1. Insert a new key/data pair. */ + if (bigkey) { + if ((ret = __bam_ovput(dbc, + B_OVERFLOW, PGNO_INVALID, h, indx, key)) != 0) + return (ret); + } else + if ((ret = __db_pitem(dbc, h, indx, + BKEYDATA_SIZE(key->size), NULL, key)) != 0) + return (ret); + + if ((ret = __bam_ca_di(dbc, PGNO(h), indx, 1)) != 0) + return (ret); + ++indx; + break; + case DB_AFTER: /* 2. Append a new data item. */ + if (TYPE(h) == P_LBTREE) { + /* Copy the key for the duplicate and adjust cursors. */ + if ((ret = + __bam_adjindx(dbc, h, indx + P_INDX, indx, 1)) != 0) + return (ret); + if ((ret = + __bam_ca_di(dbc, PGNO(h), indx + P_INDX, 1)) != 0) + return (ret); + + indx += 3; + dupadjust = 1; + + cp->indx += 2; + } else { + ++indx; + cp->indx += 1; + } + break; + case DB_BEFORE: /* 3. Insert a new data item. */ + if (TYPE(h) == P_LBTREE) { + /* Copy the key for the duplicate and adjust cursors. */ + if ((ret = __bam_adjindx(dbc, h, indx, indx, 1)) != 0) + return (ret); + if ((ret = __bam_ca_di(dbc, PGNO(h), indx, 1)) != 0) + return (ret); + + ++indx; + dupadjust = 1; + } + break; + case DB_CURRENT: + /* + * Clear the cursor's deleted flag. The problem is that if + * we deadlock or fail while deleting the overflow item or + * replacing the non-overflow item, a subsequent cursor close + * will try and remove the item because the cursor's delete + * flag is set + */ + (void)__bam_ca_delete(dbp, PGNO(h), indx, 0); + + if (TYPE(h) == P_LBTREE) { + ++indx; + dupadjust = 1; + + /* + * In a Btree deleted records aren't counted (deleted + * records are counted in a Recno because all accesses + * are based on record number). If it's a Btree and + * it's a DB_CURRENT operation overwriting a previously + * deleted record, increment the record count. + */ + was_deleted = B_DISSET(bk->type); + } + + /* + * 4. Delete and re-add the data item. + * + * If we're changing the type of the on-page structure, or we + * are referencing offpage items, we have to delete and then + * re-add the item. We do not do any cursor adjustments here + * because we're going to immediately re-add the item into the + * same slot. + */ + if (bigdata || B_TYPE(bk->type) != B_KEYDATA) { + if ((ret = __bam_ditem(dbc, h, indx)) != 0) + return (ret); + break; + } + + /* 5. Overwrite the data item. */ + replace = 1; + break; + default: + return (__db_unknown_flag(dbp->dbenv, "__bam_iitem", op)); + } + + /* Add the data. */ + if (bigdata) { + if ((ret = __bam_ovput(dbc, + B_OVERFLOW, PGNO_INVALID, h, indx, data)) != 0) + return (ret); + } else { + if (LF_ISSET(BI_DELETED)) { + B_TSET(bk_tmp.type, B_KEYDATA, 1); + bk_tmp.len = data->size; + bk_hdr.data = &bk_tmp; + bk_hdr.size = SSZA(BKEYDATA, data); + ret = __db_pitem(dbc, h, indx, + BKEYDATA_SIZE(data->size), &bk_hdr, data); + } else if (replace) + ret = __bam_ritem(dbc, h, indx, data); + else + ret = __db_pitem(dbc, h, indx, + BKEYDATA_SIZE(data->size), NULL, data); + if (ret != 0) + return (ret); + } + if ((ret = memp_fset(dbp->mpf, h, DB_MPOOL_DIRTY)) != 0) + return (ret); + + /* + * Re-position the cursors if necessary and reset the current cursor + * to point to the new item. + */ + if (op != DB_CURRENT) { + if ((ret = __bam_ca_di(dbc, PGNO(h), indx, 1)) != 0) + return (ret); + cp->indx = TYPE(h) == P_LBTREE ? indx - O_INDX : indx; + } + + /* + * If we've changed the record count, update the tree. There's no + * need to adjust the count if the operation not performed on the + * current record or when the current record was previously deleted. + */ + if (F_ISSET(cp, C_RECNUM) && (op != DB_CURRENT || was_deleted)) + if ((ret = __bam_adjust(dbc, 1)) != 0) + return (ret); + + /* + * If a Btree leaf page is at least 50% full and we may have added or + * modified a duplicate data item, see if the set of duplicates takes + * up at least 25% of the space on the page. If it does, move it onto + * its own page. + */ + if (dupadjust && P_FREESPACE(h) <= dbp->pgsize / 2) { + if ((ret = __bam_dup_convert(dbc, h, indx - O_INDX)) != 0) + return (ret); + } + + /* If we've modified a recno file, set the flag. */ + if (dbc->dbtype == DB_RECNO) + t->re_modified = 1; + + return (ret); +} + +/* + * __bam_partsize -- + * Figure out how much space a partial data item is in total. + * + * PUBLIC: u_int32_t __bam_partsize __P((u_int32_t, DBT *, PAGE *, u_int32_t)); + */ +u_int32_t +__bam_partsize(op, data, h, indx) + u_int32_t op, indx; + DBT *data; + PAGE *h; +{ + BKEYDATA *bk; + u_int32_t nbytes; + + /* + * If the record doesn't already exist, it's simply the data we're + * provided. + */ + if (op != DB_CURRENT) + return (data->doff + data->size); + + /* + * Otherwise, it's the data provided plus any already existing data + * that we're not replacing. + */ + bk = GET_BKEYDATA(h, indx + (TYPE(h) == P_LBTREE ? O_INDX : 0)); + nbytes = + B_TYPE(bk->type) == B_OVERFLOW ? ((BOVERFLOW *)bk)->tlen : bk->len; + + /* + * There are really two cases here: + * + * Case 1: We are replacing some bytes that do not exist (i.e., they + * are past the end of the record). In this case the number of bytes + * we are replacing is irrelevant and all we care about is how many + * bytes we are going to add from offset. So, the new record length + * is going to be the size of the new bytes (size) plus wherever those + * new bytes begin (doff). + * + * Case 2: All the bytes we are replacing exist. Therefore, the new + * size is the oldsize (nbytes) minus the bytes we are replacing (dlen) + * plus the bytes we are adding (size). + */ + if (nbytes < data->doff + data->dlen) /* Case 1 */ + return (data->doff + data->size); + + return (nbytes + data->size - data->dlen); /* Case 2 */ +} + +/* + * __bam_build -- + * Build the real record for a partial put, or short fixed-length record. + * + * PUBLIC: int __bam_build __P((DBC *, u_int32_t, + * PUBLIC: DBT *, PAGE *, u_int32_t, u_int32_t)); + */ +int +__bam_build(dbc, op, dbt, h, indx, nbytes) + DBC *dbc; + u_int32_t op, indx, nbytes; + DBT *dbt; + PAGE *h; +{ + BKEYDATA *bk, tbk; + BOVERFLOW *bo; + BTREE *t; + BTREE_CURSOR *cp; + DB *dbp; + DBT copy; + u_int32_t len, tlen; + u_int8_t *p; + int ret; + + COMPQUIET(bo, NULL); + + dbp = dbc->dbp; + cp = (BTREE_CURSOR *) dbc->internal; + t = dbp->bt_internal; + + /* We use the record data return memory, it's only a short-term use. */ + if (dbc->rdata.ulen < nbytes) { + if ((ret = __os_realloc(dbp->dbenv, + nbytes, NULL, &dbc->rdata.data)) != 0) { + dbc->rdata.ulen = 0; + dbc->rdata.data = NULL; + return (ret); + } + dbc->rdata.ulen = nbytes; + } + + /* + * We use nul or pad bytes for any part of the record that isn't + * specified; get it over with. + */ + memset(dbc->rdata.data, + F_ISSET(dbp, DB_RE_FIXEDLEN) ? t->re_pad : 0, nbytes); + + /* + * In the next clauses, we need to do three things: a) set p to point + * to the place at which to copy the user's data, b) set tlen to the + * total length of the record, not including the bytes contributed by + * the user, and c) copy any valid data from an existing record. If + * it's not a partial put (this code is called for both partial puts + * and fixed-length record padding) or it's a new key, we can cut to + * the chase. + */ + if (!F_ISSET(dbt, DB_DBT_PARTIAL) || op != DB_CURRENT) { + p = (u_int8_t *)dbc->rdata.data + dbt->doff; + tlen = dbt->doff; + goto user_copy; + } + + /* Find the current record. */ + if (indx < NUM_ENT(h)) { + bk = GET_BKEYDATA(h, indx + (TYPE(h) == P_LBTREE ? O_INDX : 0)); + bo = (BOVERFLOW *)bk; + } else { + bk = &tbk; + B_TSET(bk->type, B_KEYDATA, 0); + bk->len = 0; + } + if (B_TYPE(bk->type) == B_OVERFLOW) { + /* + * In the case of an overflow record, we shift things around + * in the current record rather than allocate a separate copy. + */ + memset(©, 0, sizeof(copy)); + if ((ret = __db_goff(dbp, ©, bo->tlen, + bo->pgno, &dbc->rdata.data, &dbc->rdata.ulen)) != 0) + return (ret); + + /* Skip any leading data from the original record. */ + tlen = dbt->doff; + p = (u_int8_t *)dbc->rdata.data + dbt->doff; + + /* + * Copy in any trailing data from the original record. + * + * If the original record was larger than the original offset + * plus the bytes being deleted, there is trailing data in the + * original record we need to preserve. If we aren't deleting + * the same number of bytes as we're inserting, copy it up or + * down, into place. + * + * Use memmove(), the regions may overlap. + */ + if (bo->tlen > dbt->doff + dbt->dlen) { + len = bo->tlen - (dbt->doff + dbt->dlen); + if (dbt->dlen != dbt->size) + memmove(p + dbt->size, p + dbt->dlen, len); + tlen += len; + } + } else { + /* Copy in any leading data from the original record. */ + memcpy(dbc->rdata.data, + bk->data, dbt->doff > bk->len ? bk->len : dbt->doff); + tlen = dbt->doff; + p = (u_int8_t *)dbc->rdata.data + dbt->doff; + + /* Copy in any trailing data from the original record. */ + len = dbt->doff + dbt->dlen; + if (bk->len > len) { + memcpy(p + dbt->size, bk->data + len, bk->len - len); + tlen += bk->len - len; + } + } + +user_copy: + /* + * Copy in the application provided data -- p and tlen must have been + * initialized above. + */ + memcpy(p, dbt->data, dbt->size); + tlen += dbt->size; + + /* Set the DBT to reference our new record. */ + dbc->rdata.size = F_ISSET(dbp, DB_RE_FIXEDLEN) ? t->re_len : tlen; + dbc->rdata.dlen = 0; + dbc->rdata.doff = 0; + dbc->rdata.flags = 0; + *dbt = dbc->rdata; + return (0); +} + +/* + * __bam_ritem -- + * Replace an item on a page. + * + * PUBLIC: int __bam_ritem __P((DBC *, PAGE *, u_int32_t, DBT *)); + */ +int +__bam_ritem(dbc, h, indx, data) + DBC *dbc; + PAGE *h; + u_int32_t indx; + DBT *data; +{ + BKEYDATA *bk; + DB *dbp; + DBT orig, repl; + db_indx_t cnt, lo, ln, min, off, prefix, suffix; + int32_t nbytes; + int ret; + u_int8_t *p, *t; + + dbp = dbc->dbp; + + /* + * Replace a single item onto a page. The logic figuring out where + * to insert and whether it fits is handled in the caller. All we do + * here is manage the page shuffling. + */ + bk = GET_BKEYDATA(h, indx); + + /* Log the change. */ + if (DB_LOGGING(dbc)) { + /* + * We might as well check to see if the two data items share + * a common prefix and suffix -- it can save us a lot of log + * message if they're large. + */ + min = data->size < bk->len ? data->size : bk->len; + for (prefix = 0, + p = bk->data, t = data->data; + prefix < min && *p == *t; ++prefix, ++p, ++t) + ; + + min -= prefix; + for (suffix = 0, + p = (u_int8_t *)bk->data + bk->len - 1, + t = (u_int8_t *)data->data + data->size - 1; + suffix < min && *p == *t; ++suffix, --p, --t) + ; + + /* We only log the parts of the keys that have changed. */ + orig.data = (u_int8_t *)bk->data + prefix; + orig.size = bk->len - (prefix + suffix); + repl.data = (u_int8_t *)data->data + prefix; + repl.size = data->size - (prefix + suffix); + if ((ret = __bam_repl_log(dbp->dbenv, dbc->txn, + &LSN(h), 0, dbp->log_fileid, PGNO(h), &LSN(h), + (u_int32_t)indx, (u_int32_t)B_DISSET(bk->type), + &orig, &repl, (u_int32_t)prefix, (u_int32_t)suffix)) != 0) + return (ret); + } + + /* + * Set references to the first in-use byte on the page and the + * first byte of the item being replaced. + */ + p = (u_int8_t *)h + HOFFSET(h); + t = (u_int8_t *)bk; + + /* + * If the entry is growing in size, shift the beginning of the data + * part of the page down. If the entry is shrinking in size, shift + * the beginning of the data part of the page up. Use memmove(3), + * the regions overlap. + */ + lo = BKEYDATA_SIZE(bk->len); + ln = BKEYDATA_SIZE(data->size); + if (lo != ln) { + nbytes = lo - ln; /* Signed difference. */ + if (p == t) /* First index is fast. */ + h->inp[indx] += nbytes; + else { /* Else, shift the page. */ + memmove(p + nbytes, p, t - p); + + /* Adjust the indices' offsets. */ + off = h->inp[indx]; + for (cnt = 0; cnt < NUM_ENT(h); ++cnt) + if (h->inp[cnt] <= off) + h->inp[cnt] += nbytes; + } + + /* Clean up the page and adjust the item's reference. */ + HOFFSET(h) += nbytes; + t += nbytes; + } + + /* Copy the new item onto the page. */ + bk = (BKEYDATA *)t; + B_TSET(bk->type, B_KEYDATA, 0); + bk->len = data->size; + memcpy(bk->data, data->data, data->size); + + return (0); +} + +/* + * __bam_dup_convert -- + * Check to see if the duplicate set at indx should have its own page. + * If it should, create it. + */ +static int +__bam_dup_convert(dbc, h, indx) + DBC *dbc; + PAGE *h; + u_int32_t indx; +{ + BTREE_CURSOR *cp; + BKEYDATA *bk; + DB *dbp; + DBT hdr; + PAGE *dp; + db_indx_t cnt, cpindx, dindx, first, sz; + int ret; + + dbp = dbc->dbp; + cp = (BTREE_CURSOR *)dbc->internal; + + /* + * Count the duplicate records and calculate how much room they're + * using on the page. + */ + while (indx > 0 && h->inp[indx] == h->inp[indx - P_INDX]) + indx -= P_INDX; + for (cnt = 0, sz = 0, first = indx;; ++cnt, indx += P_INDX) { + if (indx >= NUM_ENT(h) || h->inp[first] != h->inp[indx]) + break; + bk = GET_BKEYDATA(h, indx); + sz += B_TYPE(bk->type) == B_KEYDATA ? + BKEYDATA_PSIZE(bk->len) : BOVERFLOW_PSIZE; + bk = GET_BKEYDATA(h, indx + O_INDX); + sz += B_TYPE(bk->type) == B_KEYDATA ? + BKEYDATA_PSIZE(bk->len) : BOVERFLOW_PSIZE; + } + + /* + * We have to do these checks when the user is replacing the cursor's + * data item -- if the application replaces a duplicate item with a + * larger data item, it can increase the amount of space used by the + * duplicates, requiring this check. But that means we may have done + * this check when it wasn't a duplicate item after all. + */ + if (cnt == 1) + return (0); + + /* + * If this set of duplicates is using more than 25% of the page, move + * them off. The choice of 25% is a WAG, but the value must be small + * enough that we can always split a page without putting duplicates + * on two different pages. + */ + if (sz < dbp->pgsize / 4) + return (0); + + /* Get a new page. */ + if ((ret = __db_new(dbc, + dbp->dup_compare == NULL ? P_LRECNO : P_LDUP, &dp)) != 0) + return (ret); + P_INIT(dp, dbp->pgsize, dp->pgno, + PGNO_INVALID, PGNO_INVALID, LEAFLEVEL, TYPE(dp)); + + /* + * Move this set of duplicates off the page. First points to the first + * key of the first duplicate key/data pair, cnt is the number of pairs + * we're dealing with. + */ + memset(&hdr, 0, sizeof(hdr)); + dindx = first; + indx = first; + cpindx = 0; + do { + /* Move cursors referencing the old entry to the new entry. */ + if ((ret = __bam_ca_dup(dbc, first, + PGNO(h), indx, PGNO(dp), cpindx)) != 0) + goto err; + + /* + * Copy the entry to the new page. If the off-duplicate page + * If the off-duplicate page is a Btree page (i.e. dup_compare + * will be non-NULL, we use Btree pages for sorted dups, + * and Recno pages for unsorted dups), move all entries + * normally, even deleted ones. If it's a Recno page, + * deleted entries are discarded (if the deleted entry is + * overflow, then free up those pages). + */ + bk = GET_BKEYDATA(h, dindx + 1); + hdr.data = bk; + hdr.size = B_TYPE(bk->type) == B_KEYDATA ? + BKEYDATA_SIZE(bk->len) : BOVERFLOW_SIZE; + if (dbp->dup_compare == NULL && B_DISSET(bk->type)) { + /* + * Unsorted dups, i.e. recno page, and we have + * a deleted entry, don't move it, but if it was + * an overflow entry, we need to free those pages. + */ + if (B_TYPE(bk->type) == B_OVERFLOW && + (ret = __db_doff(dbc, + (GET_BOVERFLOW(h, dindx + 1))->pgno)) != 0) + goto err; + } else { + if ((ret = __db_pitem( + dbc, dp, cpindx, hdr.size, &hdr, NULL)) != 0) + goto err; + ++cpindx; + } + /* Delete all but the last reference to the key. */ + if (cnt != 1) { + if ((ret = __bam_adjindx(dbc, + h, dindx, first + 1, 0)) != 0) + goto err; + } else + dindx++; + + /* Delete the data item. */ + if ((ret = __db_ditem(dbc, h, dindx, hdr.size)) != 0) + goto err; + indx += P_INDX; + } while (--cnt); + + /* Put in a new data item that points to the duplicates page. */ + if ((ret = __bam_ovput(dbc, + B_DUPLICATE, dp->pgno, h, first + 1, NULL)) != 0) + goto err; + + /* Adjust cursors for all the above movments. */ + if ((ret = __bam_ca_di(dbc, + PGNO(h), first + P_INDX, first + P_INDX - indx)) != 0) + goto err; + + return (memp_fput(dbp->mpf, dp, DB_MPOOL_DIRTY)); + +err: (void)__db_free(dbc, dp); + return (ret); +} + +/* + * __bam_ovput -- + * Build an item for an off-page duplicates page or overflow page and + * insert it on the page. + */ +static int +__bam_ovput(dbc, type, pgno, h, indx, item) + DBC *dbc; + u_int32_t type, indx; + db_pgno_t pgno; + PAGE *h; + DBT *item; +{ + BOVERFLOW bo; + DBT hdr; + int ret; + + UMRW_SET(bo.unused1); + B_TSET(bo.type, type, 0); + UMRW_SET(bo.unused2); + + /* + * If we're creating an overflow item, do so and acquire the page + * number for it. If we're creating an off-page duplicates tree, + * we are giving the page number as an argument. + */ + if (type == B_OVERFLOW) { + if ((ret = __db_poff(dbc, item, &bo.pgno)) != 0) + return (ret); + bo.tlen = item->size; + } else { + bo.pgno = pgno; + bo.tlen = 0; + } + + /* Store the new record on the page. */ + memset(&hdr, 0, sizeof(hdr)); + hdr.data = &bo; + hdr.size = BOVERFLOW_SIZE; + return (__db_pitem(dbc, h, indx, BOVERFLOW_SIZE, &hdr, NULL)); +} |