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ITS#8321 simplify page_split fixups

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This commit is contained in:
Howard Chu 2015-11-23 01:33:00 +00:00
parent 7a76ded030
commit 8fdf79600a
1 changed files with 11 additions and 5 deletions
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16
libraries/liblmdb/mdb.c
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@ -8606,7 +8606,7 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
/* Adjust other cursors pointing to mp */
MDB_cursor *m2, *m3;
MDB_dbi dbi = mc->mc_dbi;
int fixup = NUMKEYS(mp);
nkeys = NUMKEYS(mp);
for (m2 = mc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
if (mc->mc_flags & C_SUB)
@ -8619,12 +8619,15 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
continue;
if (new_root) {
int k;
/* sub cursors may be on different DB */
if (m3->mc_pg[0] != mp)
continue;
/* root split */
for (k=new_root; k>=0; k--) {
m3->mc_ki[k+1] = m3->mc_ki[k];
m3->mc_pg[k+1] = m3->mc_pg[k];
}
if (m3->mc_ki[0] >= split_indx) {
if (m3->mc_ki[0] > nkeys) {
m3->mc_ki[0] = 1;
} else {
m3->mc_ki[0] = 0;
@ -8636,10 +8639,13 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
if (m3->mc_top >= mc->mc_top && m3->mc_pg[mc->mc_top] == mp) {
if (m3->mc_ki[mc->mc_top] >= newindx && !(nflags & MDB_SPLIT_REPLACE))
m3->mc_ki[mc->mc_top]++;
if (m3->mc_ki[mc->mc_top] >= fixup) {
if (m3->mc_ki[mc->mc_top] >= nkeys) {
m3->mc_pg[mc->mc_top] = rp;
m3->mc_ki[mc->mc_top] -= fixup;
m3->mc_ki[ptop] = mn.mc_ki[ptop];
m3->mc_ki[mc->mc_top] -= nkeys;
for (i=0; i<mc->mc_top; i++) {
m3->mc_ki[i] = mn.mc_ki[i];
m3->mc_pg[i] = mn.mc_pg[i];
}
}
} else if (!did_split && m3->mc_top >= ptop && m3->mc_pg[ptop] == mc->mc_pg[ptop] &&
m3->mc_ki[ptop] >= mc->mc_ki[ptop]) {