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lmdb: ITS#8263 fix cursor tracking in cursor_put.

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Includes ITS#8263 streamline prev patch.
This commit is contained in:
Howard Chu 2015-10-07 06:30:58 +01:00 committed by Leo Yuriev
parent 68171d5f5d
commit f6045ae77e
1 changed files with 54 additions and 16 deletions
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70
mdb.c
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@ -1059,6 +1059,7 @@ static int mdb_cursor_last(MDB_cursor *mc, MDB_val *key, MDB_val *data);
static void mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx);
static void mdb_xcursor_init0(MDB_cursor *mc);
static void mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node);
static void mdb_xcursor_init2(MDB_cursor *mc, MDB_xcursor *src_mx, int force);
static int mdb_drop0(MDB_cursor *mc, int subs);
static void mdb_default_cmp(MDB_txn *txn, MDB_dbi dbi);
@ -6202,7 +6203,7 @@ mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
{
MDB_env *env;
MDB_node *leaf = NULL;
MDB_page *fp, *mp;
MDB_page *fp, *mp, *sub_root = NULL;
uint16_t fp_flags;
MDB_val xdata, *rdata, dkey, olddata;
MDB_db dummy;
@ -6491,6 +6492,7 @@ prep_subDB:
offset = env->me_psize - olddata.mv_size;
flags |= F_DUPDATA|F_SUBDATA;
dummy.md_root = mp->mp_pgno;
sub_root = mp;
}
if (mp != fp) {
mp->mp_flags = fp_flags | P_DIRTY;
@ -6637,7 +6639,7 @@ new_sub:
* DB are all zero size.
*/
if (do_sub) {
int xflags;
int xflags, new_dupdata;
size_t ecount;
put_sub:
xdata.mv_size = 0;
@ -6650,28 +6652,32 @@ put_sub:
xflags = (flags & MDB_NODUPDATA) ?
MDB_NOOVERWRITE|MDB_NOSPILL : MDB_NOSPILL;
}
if (sub_root)
mc->mc_xcursor->mx_cursor.mc_pg[0] = sub_root;
new_dupdata = (int)dkey.mv_size;
/* converted, write the original data first */
if (dkey.mv_size) {
rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, xflags);
if (unlikely(rc))
goto bad_sub;
{
/* Adjust other cursors pointing to mp */
MDB_cursor *m2;
unsigned i = mc->mc_top;
MDB_page *mp = mc->mc_pg[i];
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
if (!(m2->mc_flags & C_INITIALIZED)) continue;
if (m2->mc_pg[i] == mp && m2->mc_ki[i] == mc->mc_ki[i]) {
mdb_xcursor_init1(m2, leaf);
}
}
}
/* we've done our job */
dkey.mv_size = 0;
}
if (!(leaf->mn_flags & F_SUBDATA) || sub_root) {
/* Adjust other cursors pointing to mp */
MDB_cursor *m2;
MDB_xcursor *mx = mc->mc_xcursor;
unsigned i = mc->mc_top;
MDB_page *mp = mc->mc_pg[i];
for (m2 = mc->mc_txn->mt_cursors[mc->mc_dbi]; m2; m2=m2->mc_next) {
if (m2 == mc || m2->mc_snum < mc->mc_snum) continue;
if (!(m2->mc_flags & C_INITIALIZED)) continue;
if (m2->mc_pg[i] == mp && m2->mc_ki[i] == mc->mc_ki[i]) {
mdb_xcursor_init2(m2, mx, new_dupdata);
}
}
}
ecount = mc->mc_xcursor->mx_db.md_entries;
if (flags & MDB_APPENDDUP)
xflags |= MDB_APPEND;
@ -7215,6 +7221,38 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
#endif */
}
/** Fixup a sorted-dups cursor due to underlying update.
* Sets up some fields that depend on the data from the main cursor.
* Almost the same as init1, but skips initialization steps if the
* xcursor had already been used.
* @param[in] mc The main cursor whose sorted-dups cursor is to be fixed up.
* @param[in] src_mx The xcursor of an up-to-date cursor.
* @param[in] new_dupdata True if converting from a non-#F_DUPDATA item.
*/
static void
mdb_xcursor_init2(MDB_cursor *mc, MDB_xcursor *src_mx, int new_dupdata)
{
MDB_xcursor *mx = mc->mc_xcursor;
if (new_dupdata) {
mx->mx_cursor.mc_snum = 1;
mx->mx_cursor.mc_top = 0;
mx->mx_cursor.mc_flags |= C_INITIALIZED;
mx->mx_cursor.mc_ki[0] = 0;
mx->mx_dbflag = DB_VALID|DB_USRVALID|DB_DIRTY; /* DB_DIRTY guides mdb_cursor_touch */
#if UINT_MAX < SIZE_MAX
mx->mx_dbx.md_cmp = src_mx->mx_dbx.md_cmp;
#endif
} else if (!(mx->mx_cursor.mc_flags & C_INITIALIZED)) {
return;
}
mx->mx_db = src_mx->mx_db;
mx->mx_cursor.mc_pg[0] = src_mx->mx_cursor.mc_pg[0];
mdb_debug("Sub-db -%u root page %zu", mx->mx_cursor.mc_dbi,
mx->mx_db.md_root);
}
/** Initialize a cursor for a given transaction and database. */
static void
mdb_cursor_init(MDB_cursor *mc, MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx)