From 1843fe0b53cbeed89d6c4c3036b23957739909cf Mon Sep 17 00:00:00 2001 From: Howard Chu Date: Sun, 4 Sep 2011 11:59:32 -0700 Subject: [PATCH] Cursors in-progress, broken --- libraries/libmdb/mdb.c | 552 ++++++++++++++++++++++++++--------------- 1 file changed, 358 insertions(+), 194 deletions(-) diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c index fdd2983..816400e 100644 --- a/libraries/libmdb/mdb.c +++ b/libraries/libmdb/mdb.c @@ -350,15 +350,15 @@ typedef struct MDB_ppage { /* ordered list of pages */ struct MDB_xcursor; struct MDB_cursor { + struct MDB_xcursor *mc_xcursor; MDB_txn *mc_txn; - MDB_ppage mc_stack[CURSOR_STACK]; /* stack of parent pages */ - unsigned int mc_snum; /* number of pushed pages */ MDB_dbi mc_dbi; + unsigned int mc_snum; /* number of pushed pages */ unsigned int mc_flags; #define C_INITIALIZED 0x01 #define C_EOF 0x02 #define C_XDIRTY 0x04 - struct MDB_xcursor *mc_xcursor; + MDB_ppage mc_stack[CURSOR_STACK]; /* stack of parent pages */ }; #define METADATA(p) ((void *)((char *)(p) + PAGEHDRSZ)) @@ -484,52 +484,55 @@ static int mdb_add_node(MDB_txn *txn, MDB_dbi dbi, MDB_page *mp, indx_t indx, MDB_val *key, MDB_val *data, pgno_t pgno, uint8_t flags); static void mdb_del_node(MDB_page *mp, indx_t indx, int ksize); -static int mdb_del0(MDB_txn *txn, MDB_dbi dbi, unsigned int ki, +static int mdb_del0(MDB_cursor *mc, unsigned int ki, MDB_pageparent *mpp, MDB_node *leaf); +#if 0 static int mdb_put0(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data, unsigned int flags); +#endif static int mdb_read_data(MDB_txn *txn, MDB_node *leaf, MDB_val *data); -static int mdb_rebalance(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *mp); -static int mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key); -static int mdb_move_node(MDB_txn *txn, MDB_dbi dbi, +static int mdb_rebalance(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *mp); +static int mdb_update_key(MDB_page *mp, indx_t indx, MDB_val *key); +static int mdb_move_node(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src, indx_t srcindx, MDB_pageparent *dst, indx_t dstindx); -static int mdb_merge(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src, +static int mdb_merge(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *src, MDB_pageparent *dst); -static int mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp, +static int mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp, unsigned int *newindxp, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno); static MDB_dpage *mdb_new_page(MDB_txn *txn, MDB_dbi dbi, uint32_t flags, int num); -static void cursor_pop_page(MDB_cursor *cursor); +static void cursor_pop_page(MDB_cursor *cursor); static MDB_ppage *cursor_push_page(MDB_cursor *cursor, MDB_page *mp); -static int mdb_sibling(MDB_cursor *cursor, int move_right); -static int mdb_cursor_next(MDB_cursor *cursor, +static int mdb_sibling(MDB_cursor *cursor, int move_right); +static void mdb_cursor_reset(MDB_cursor *mc); +static int mdb_cursor_next(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op op); -static int mdb_cursor_prev(MDB_cursor *cursor, +static int mdb_cursor_prev(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op op); -static int mdb_cursor_set(MDB_cursor *cursor, +static int mdb_cursor_set(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op op, int *exactp); -static int mdb_cursor_first(MDB_cursor *cursor, +static int mdb_cursor_first(MDB_cursor *cursor, MDB_val *key, MDB_val *data); -static int mdb_cursor_last(MDB_cursor *cursor, +static int mdb_cursor_last(MDB_cursor *cursor, MDB_val *key, MDB_val *data); -static void mdb_xcursor_init0(MDB_cursor *mc); -static void mdb_xcursor_init1(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx, - MDB_page *mp, MDB_node *node); -static void mdb_xcursor_fini(MDB_cursor *mc); +static void mdb_xcursor_init0(MDB_cursor *mc); +static void mdb_xcursor_init1(MDB_cursor *mc, MDB_page *mp, MDB_node *node); +static void mdb_xcursor_init2(MDB_cursor *mc); +static void mdb_xcursor_fini(MDB_cursor *mc); -static size_t mdb_leaf_size(MDB_env *env, MDB_val *key, +static size_t mdb_leaf_size(MDB_env *env, MDB_val *key, MDB_val *data); -static size_t mdb_branch_size(MDB_env *env, MDB_val *key); +static size_t mdb_branch_size(MDB_env *env, MDB_val *key); -static int memncmp(const void *s1, size_t n1, +static int memncmp(const void *s1, size_t n1, const void *s2, size_t n2); -static int memnrcmp(const void *s1, size_t n1, +static int memnrcmp(const void *s1, size_t n1, const void *s2, size_t n2); #ifdef _WIN32 @@ -610,8 +613,12 @@ mdb_dkey(MDB_val *key, char *buf) unsigned int i; if (key->mv_size > MAXKEYSIZE) return "MAXKEYSIZE"; +#if 0 for (i=0; imv_size; i++) ptr += sprintf(ptr, "%02x", *c++); +#else + sprintf(buf, "%.*s", key->mv_size, key->mv_data); +#endif return buf; } #endif @@ -669,7 +676,7 @@ mdb_alloc_page(MDB_txn *txn, MDB_dbi dbi, MDB_page *parent, unsigned int parent_ mpp.mp_parent = NULL; mpp.mp_pi = 0; mc.mc_txn = txn; - mc.mc_dbi = dbi; + mc.mc_dbi = FREE_DBI; mc.mc_snum = 0; mc.mc_flags = 0; mdb_search_page(txn, FREE_DBI, NULL, &mc, 0, &mpp); @@ -1004,6 +1011,7 @@ mdb_txn_commit(MDB_txn *txn) MDB_dpage *dp; MDB_env *env; pgno_t next; + MDB_cursor mc; assert(txn != NULL); assert(txn->mt_env != NULL); @@ -1033,6 +1041,10 @@ mdb_txn_commit(MDB_txn *txn) DPRINTF("committing txn %lu %p on mdbenv %p, root page %lu", txn->mt_txnid, txn, (void *)env, txn->mt_dbs[MAIN_DBI].md_root); + mc.mc_txn = txn; + mc.mc_dbi = FREE_DBI; + mc.mc_flags = 0; + /* should only be one record now */ if (env->me_pghead) { MDB_pageparent mpp; @@ -1040,7 +1052,8 @@ mdb_txn_commit(MDB_txn *txn) /* make sure first page of freeDB is touched and on freelist */ mpp.mp_parent = NULL; mpp.mp_pi = 0; - mdb_search_page(txn, FREE_DBI, NULL, NULL, 1, &mpp); + mc.mc_snum = 0; + mdb_search_page(txn, FREE_DBI, NULL, &mc, 1, &mpp); } /* save to free list */ if (!MDB_IDL_IS_ZERO(txn->mt_free_pgs)) { @@ -1053,7 +1066,8 @@ mdb_txn_commit(MDB_txn *txn) key.mv_data = NULL; mpp.mp_parent = NULL; mpp.mp_pi = 0; - mdb_search_page(txn, FREE_DBI, &key, NULL, 1, &mpp); + mc.mc_snum = 0; + mdb_search_page(txn, FREE_DBI, &key, &mc, 1, &mpp); #if DEBUG > 1 { @@ -1077,7 +1091,7 @@ mdb_txn_commit(MDB_txn *txn) do { i = txn->mt_free_pgs[0]; data.mv_size = MDB_IDL_SIZEOF(txn->mt_free_pgs); - rc = mdb_put0(txn, FREE_DBI, &key, &data, 0); + rc = mdb_cursor_put(&mc, &key, &data, 0); if (rc) { mdb_txn_abort(txn); return rc; @@ -1094,7 +1108,7 @@ mdb_txn_commit(MDB_txn *txn) key.mv_data = (char *)&mop->mo_txnid; data.mv_size = MDB_IDL_SIZEOF(mop->mo_pages); data.mv_data = mop->mo_pages; - mdb_put0(txn, FREE_DBI, &key, &data, 0); + mdb_cursor_put(&mc, &key, &data, 0); free(env->me_pghead); env->me_pghead = NULL; } @@ -1106,10 +1120,12 @@ mdb_txn_commit(MDB_txn *txn) MDB_val data; data.mv_size = sizeof(MDB_db); + mc.mc_dbi = MAIN_DBI; + mc.mc_flags = 0; for (i = 2; i < txn->mt_numdbs; i++) { if (txn->mt_dbxs[i].md_dirty) { data.mv_data = &txn->mt_dbs[i]; - mdb_put0(txn, MAIN_DBI, &txn->mt_dbxs[i].md_name, &data, 0); + mdb_cursor_put(&mc, &txn->mt_dbxs[i].md_name, &data, 0); } } } @@ -2025,14 +2041,14 @@ mdb_search_node(MDB_txn *txn, MDB_dbi dbi, MDB_page *mp, MDB_val *key, if (rc > 0) { /* Found entry is less than the key. */ i++; /* Skip to get the smallest entry larger than key. */ - if (i >= NUMKEYS(mp)) - /* There is no entry larger or equal to the key. */ - return NULL; } if (exactp) *exactp = (rc == 0); if (kip) /* Store the key index if requested. */ *kip = i; + if (i >= NUMKEYS(mp)) + /* There is no entry larger or equal to the key. */ + return NULL; /* nodeptr is fake for LEAF2 */ return IS_LEAF2(mp) ? NODEPTR(mp, 0) : NODEPTR(mp, i); @@ -2364,6 +2380,9 @@ mdb_cursor_next(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op o } } + if (cursor->mc_flags & C_XDIRTY) + mdb_cursor_reset(cursor); + DPRINTF("cursor_next: top page is %lu in cursor %p", mp->mp_pgno, (void *) cursor); if (top->mp_ki + 1 >= NUMKEYS(mp)) { @@ -2391,7 +2410,7 @@ mdb_cursor_next(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op o leaf = NODEPTR(mp, top->mp_ki); if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, mp, leaf); + mdb_xcursor_init1(cursor, mp, leaf); } if (data) { if ((rc = mdb_read_data(cursor->mc_txn, leaf, data) != MDB_SUCCESS)) @@ -2436,6 +2455,9 @@ mdb_cursor_prev(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op o } } + if (cursor->mc_flags & C_XDIRTY) + mdb_cursor_reset(cursor); + DPRINTF("cursor_prev: top page is %lu in cursor %p", mp->mp_pgno, (void *) cursor); if (top->mp_ki == 0) { @@ -2466,7 +2488,7 @@ mdb_cursor_prev(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op o leaf = NODEPTR(mp, top->mp_ki); if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, mp, leaf); + mdb_xcursor_init1(cursor, mp, leaf); } if (data) { if ((rc = mdb_read_data(cursor->mc_txn, leaf, data) != MDB_SUCCESS)) @@ -2519,6 +2541,9 @@ mdb_cursor_set(MDB_cursor *cursor, MDB_val *key, MDB_val *data, } } } + if (cursor->mc_flags & C_XDIRTY) + mdb_cursor_reset(cursor); + cursor->mc_snum = 0; rc = mdb_search_page(cursor->mc_txn, cursor->mc_dbi, key, cursor, 0, &mpp); @@ -2556,7 +2581,7 @@ set2: } if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, mpp.mp_page, leaf); + mdb_xcursor_init1(cursor, mpp.mp_page, leaf); } if (data) { if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { @@ -2605,6 +2630,9 @@ mdb_cursor_first(MDB_cursor *cursor, MDB_val *key, MDB_val *data) MDB_pageparent mpp; MDB_node *leaf; + if (cursor->mc_flags & C_XDIRTY) + mdb_cursor_reset(cursor); + cursor->mc_snum = 0; rc = mdb_search_page(cursor->mc_txn, cursor->mc_dbi, NULL, cursor, 0, &mpp); @@ -2624,7 +2652,7 @@ mdb_cursor_first(MDB_cursor *cursor, MDB_val *key, MDB_val *data) if (data) { if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, mpp.mp_page, leaf); + mdb_xcursor_init1(cursor, mpp.mp_page, leaf); rc = mdb_cursor_first(&cursor->mc_xcursor->mx_cursor, data, NULL); if (rc) return rc; @@ -2648,6 +2676,9 @@ mdb_cursor_last(MDB_cursor *cursor, MDB_val *key, MDB_val *data) MDB_node *leaf; MDB_val lkey; + if (cursor->mc_flags & C_XDIRTY) + mdb_cursor_reset(cursor); + cursor->mc_snum = 0; lkey.mv_size = MAXKEYSIZE+1; @@ -2673,7 +2704,7 @@ mdb_cursor_last(MDB_cursor *cursor, MDB_val *key, MDB_val *data) if (data) { if (F_ISSET(leaf->mn_flags, F_DUPDATA)) { - mdb_xcursor_init1(cursor->mc_txn, cursor->mc_dbi, cursor->mc_xcursor, mpp.mp_page, leaf); + mdb_xcursor_init1(cursor, mpp.mp_page, leaf); rc = mdb_cursor_last(&cursor->mc_xcursor->mx_cursor, data, NULL); if (rc) return rc; @@ -2801,64 +2832,194 @@ fetchm: } static int -mdb_cursor_touch(MDB_cursor *cursor) +mdb_cursor_touch(MDB_cursor *mc) { MDB_pageparent mpp; + MDB_dhead *dh; unsigned int i; int rc; mpp.mp_parent = NULL; mpp.mp_pi = 0; - for(i=0; imc_snum; i++) { - mpp.mp_page = cursor->mc_stack[i].mp_page; + if (mc->mc_dbi > MAIN_DBI && !mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty) { + rc = mdb_search_page(mc->mc_txn, MAIN_DBI, &mc->mc_txn->mt_dbxs[mc->mc_dbi].md_name, + NULL, 1, &mpp); + if (rc) return rc; + mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1; + } + for(i=0; imc_snum; i++) { + mpp.mp_page = mc->mc_stack[i].mp_page; if (!F_ISSET(mpp.mp_page->mp_flags, P_DIRTY)) { - rc = mdb_touch(cursor->mc_txn, cursor->mc_dbi, &mpp); + rc = mdb_touch(mc->mc_txn, mc->mc_dbi, &mpp); if (rc) return rc; - cursor->mc_stack[i].mp_page = mpp.mp_page; + mc->mc_stack[i].mp_page = mpp.mp_page; + if (!i) { + mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = mpp.mp_page->mp_pgno; + } } + dh = ((MDB_dhead *)mpp.mp_page)-1; + dh->md_parent = mpp.mp_parent; + dh->md_pi = mpp.mp_pi; mpp.mp_parent = mpp.mp_page; - mpp.mp_pi = cursor->mc_stack[i].mp_ki; + mpp.mp_pi = mc->mc_stack[i].mp_ki; } return MDB_SUCCESS; } int -mdb_cursor_put(MDB_cursor *cursor, MDB_val *key, MDB_val *data, +mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data, unsigned int flags) { MDB_ppage *top; MDB_node *leaf; - int rc, exact; + MDB_val xdata, *rdata, dkey; + MDB_db dummy; + char dbuf[PAGESIZE]; + int do_sub = 0; + size_t nsize; + DKBUF; + int rc, rc2; - if (F_ISSET(cursor->mc_txn->mt_flags, MDB_TXN_RDONLY)) + if (F_ISSET(mc->mc_txn->mt_flags, MDB_TXN_RDONLY)) return EACCES; - if (flags == MDB_NODUPDATA) { - rc = mdb_cursor_set(cursor, key, data, MDB_GET_BOTH, &exact); - if (rc == 0) - return MDB_KEYEXIST; - if (rc != MDB_NOTFOUND) - return rc; - } else if (flags != MDB_CURRENT) { - rc = mdb_cursor_set(cursor, key, NULL, MDB_SET, &exact); - if (flags == MDB_NOOVERWRITE && rc == 0) + DPRINTF("==> put db %u key [%s], size %zu, data size %zu", + mc->mc_dbi, DKEY(key), key->mv_size, data->mv_size); + + dkey.mv_size = 0; + + if (flags == MDB_CURRENT) { + if (!(mc->mc_flags & C_INITIALIZED)) + return EINVAL; + rc = MDB_SUCCESS; + } else if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_root == P_INVALID) { + MDB_dpage *dp; + /* new database, write a root leaf page */ + DPUTS("allocating new root leaf page"); + if ((dp = mdb_new_page(mc->mc_txn, mc->mc_dbi, P_LEAF, 1)) == NULL) { + return ENOMEM; + } + mc->mc_snum = 0; + cursor_push_page(mc, &dp->p); + mc->mc_txn->mt_dbs[mc->mc_dbi].md_root = dp->p.mp_pgno; + mc->mc_txn->mt_dbs[mc->mc_dbi].md_depth++; + mc->mc_txn->mt_dbxs[mc->mc_dbi].md_dirty = 1; + if ((mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & (MDB_DUPSORT|MDB_DUPFIXED)) + == MDB_DUPFIXED) + dp->p.mp_flags |= P_LEAF2; + rc = MDB_NOTFOUND; + } else { + int exact = 0; + rc = mdb_cursor_set(mc, key, NULL, MDB_SET, &exact); + if (flags == MDB_NOOVERWRITE && rc == 0) { + DPRINTF("duplicate key [%s]", DKEY(key)); return MDB_KEYEXIST; - if (rc != MDB_NOTFOUND) + } + if (rc && rc != MDB_NOTFOUND) return rc; - } else if (!(cursor->mc_flags & C_INITIALIZED)) { - return EINVAL; } + /* Cursor is positioned, now make sure all pages are writable */ - rc = mdb_cursor_touch(cursor); - if (rc) return rc; - if (cursor->mc_xcursor) { - rc = mdb_cursor_touch(&cursor->mc_xcursor->mx_cursor); - if (rc) return rc; - cursor->mc_flags |= C_XDIRTY; + rc2 = mdb_cursor_touch(mc); + if (rc2) return rc2; + + top = CURSOR_TOP(mc); + + /* The key already exists */ + if (rc == MDB_SUCCESS) { + /* there's only a key anyway, so this is a no-op */ + if (IS_LEAF2(top->mp_page)) + return MDB_SUCCESS; + + leaf = NODEPTR(top->mp_page, top->mp_ki); + + /* DB has dups? */ + if (F_ISSET(mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags, MDB_DUPSORT)) { + /* Was a single item before, must convert now */ + if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) { + dkey.mv_size = NODEDSZ(leaf); + dkey.mv_data = dbuf; + memcpy(dbuf, NODEDATA(leaf), dkey.mv_size); + /* data matches, ignore it */ + if (!mdb_dcmp(mc->mc_txn, mc->mc_dbi, data, &dkey)) + return (flags == MDB_NODUPDATA) ? MDB_KEYEXIST : MDB_SUCCESS; + memset(&dummy, 0, sizeof(dummy)); + if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_DUPFIXED) { + dummy.md_pad = data->mv_size; + dummy.md_flags = MDB_DUPFIXED; + if (mc->mc_txn->mt_dbs[mc->mc_dbi].md_flags & MDB_INTEGERDUP) + dummy.md_flags |= MDB_INTEGERKEY; + } + dummy.md_root = P_INVALID; + if (dkey.mv_size == sizeof(MDB_db)) { + memcpy(NODEDATA(leaf), &dummy, sizeof(dummy)); + goto put_sub; + } + mdb_del_node(top->mp_page, top->mp_ki, 0); + do_sub = 1; + rdata = &xdata; + xdata.mv_size = sizeof(MDB_db); + xdata.mv_data = &dummy; + goto new_sub; + } + goto put_sub; + } + /* same size, just replace it */ + if (!F_ISSET(leaf->mn_flags, F_BIGDATA) && + NODEDSZ(leaf) == data->mv_size) { + memcpy(NODEDATA(leaf), data->mv_data, data->mv_size); + goto done; + } + mdb_del_node(top->mp_page, top->mp_ki, 0); + } else { + DPRINTF("appending key at index %i", top->mp_ki); } - top = CURSOR_TOP(cursor); + rdata = data; + +new_sub: + nsize = IS_LEAF2(top->mp_page) ? key->mv_size : mdb_leaf_size(mc->mc_txn->mt_env, key, rdata); + if (SIZELEFT(top->mp_page) < nsize) { + rc = mdb_split(mc->mc_txn, mc->mc_dbi, &top->mp_page, &top->mp_ki, key, rdata, P_INVALID); + } else { + /* There is room already in this leaf page. */ + rc = mdb_add_node(mc->mc_txn, mc->mc_dbi, top->mp_page, top->mp_ki, key, rdata, 0, 0); + } + + if (rc != MDB_SUCCESS) + mc->mc_txn->mt_flags |= MDB_TXN_ERROR; + else { + /* Remember if we just added a subdatabase */ + if (flags & F_SUBDATA) { + leaf = NODEPTR(top->mp_page, top->mp_ki); + leaf->mn_flags |= F_SUBDATA; + } + /* Now store the actual data in the child DB. Note that we're + * storing the user data in the keys field, so there are strict + * size limits on dupdata. The actual data fields of the child + * DB are all zero size. + */ + if (do_sub) { + leaf = NODEPTR(top->mp_page, top->mp_ki); +put_sub: + mdb_xcursor_init1(mc, top->mp_page, leaf); + xdata.mv_size = 0; + xdata.mv_data = ""; + if (flags == MDB_NODUPDATA) + flags = MDB_NOOVERWRITE; + /* converted, write the original data first */ + if (dkey.mv_size) { + rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, &dkey, &xdata, flags); + if (rc) return rc; + leaf->mn_flags |= F_DUPDATA; + } + rc = mdb_cursor_put(&mc->mc_xcursor->mx_cursor, data, &xdata, flags); + mc->mc_flags |= C_XDIRTY; + } + mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries++; + } +done: return rc; } @@ -2878,65 +3039,71 @@ mdb_cursor_del(MDB_cursor *mc, unsigned int flags) rc = mdb_cursor_touch(mc); if (rc) return rc; - if (mc->mc_xcursor) { - rc = mdb_cursor_touch(&mc->mc_xcursor->mx_cursor); - if (rc) return rc; - } top = CURSOR_TOP(mc); leaf = NODEPTR(top->mp_page, top->mp_ki); + mpp.mp_page = top->mp_page; + if (mc->mc_snum > 1) { + MDB_ppage *parent = CURSOR_PARENT(mc); + mpp.mp_parent = parent->mp_page; + mpp.mp_pi = parent->mp_ki; + } else { + mpp.mp_parent = NULL; + mpp.mp_pi = 0; + } if (!IS_LEAF2(top->mp_page) && F_ISSET(leaf->mn_flags, F_DUPDATA)) { MDB_pageparent mp2; if (flags != MDB_NODUPDATA) { + mdb_xcursor_init2(mc); rc = mdb_cursor_del(&mc->mc_xcursor->mx_cursor, 0); - mdb_xcursor_fini(mc); + mc->mc_flags |= C_XDIRTY; /* If sub-DB still has entries, we're done */ if (mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_root != P_INVALID) { - memcpy(NODEDATA(leaf), - &mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi], - sizeof(MDB_db)); mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries--; return rc; } /* otherwise fall thru and delete the sub-DB */ - } else { - /* add all the child DB's pages to the free list */ - rc = mdb_search_page(&mx.mx_txn, mx.mx_cursor.mc_dbi, - NULL, &mx.mx_cursor, 0, &mp2); - if (rc == MDB_SUCCESS) { - MDB_ppage *top, *parent; - MDB_node *ni; - unsigned int i; + } + + /* add all the child DB's pages to the free list */ + rc = mdb_search_page(&mc->mc_xcursor->mx_txn, mc->mc_xcursor->mx_cursor.mc_dbi, + NULL, &mc->mc_xcursor->mx_cursor, 0, &mp2); + if (rc == MDB_SUCCESS) { + MDB_ppage *top, *parent; + MDB_node *ni; + unsigned int i; - cursor_pop_page(&mx.mx_cursor); - if (mx.mx_cursor.mc_snum) { - top = CURSOR_TOP(&mx.mx_cursor); - while (mx.mx_cursor.mc_snum > 1) { - parent = CURSOR_PARENT(&mx.mx_cursor); - for (i=0; imp_page); i++) { - ni = NODEPTR(top->mp_page, i); - mdb_midl_insert(txn->mt_free_pgs, NODEPGNO(ni)); - } - parent->mp_ki++; - if (parent->mp_ki >= NUMKEYS(parent->mp_page)) { - cursor_pop_page(&mx.mx_cursor); - top = parent; - } else { - ni = NODEPTR(parent->mp_page, parent->mp_ki); - rc = mdb_get_page(&mx.mx_txn, NODEPGNO(ni), &top->mp_page); - } + mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries -= + mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_entries; + + cursor_pop_page(&mc->mc_xcursor->mx_cursor); + if (mc->mc_xcursor->mx_cursor.mc_snum) { + top = CURSOR_TOP(&mc->mc_xcursor->mx_cursor); + while (mc->mc_xcursor->mx_cursor.mc_snum > 1) { + parent = CURSOR_PARENT(&mc->mc_xcursor->mx_cursor); + for (i=0; imp_page); i++) { + ni = NODEPTR(top->mp_page, i); + mdb_midl_insert(mc->mc_txn->mt_free_pgs, NODEPGNO(ni)); + } + parent->mp_ki++; + if (parent->mp_ki >= NUMKEYS(parent->mp_page)) { + cursor_pop_page(&mc->mc_xcursor->mx_cursor); + top = parent; + } else { + ni = NODEPTR(parent->mp_page, parent->mp_ki); + rc = mdb_get_page(&mc->mc_xcursor->mx_txn, NODEPGNO(ni), &top->mp_page); } } - mdb_midl_insert(txn->mt_free_pgs, mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi].md_root); } + mdb_midl_insert(mc->mc_txn->mt_free_pgs, + mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_root); } } - return mdb_del0(txn, dbi, ki, &mpp, leaf); - return rc; + return mdb_del0(mc, top->mp_ki, &mpp, leaf); } /* Allocate a page and initialize it @@ -3175,41 +3342,54 @@ mdb_xcursor_init0(MDB_cursor *mc) mx->mx_dbxs[dbn+1].md_dirty = 0; mx->mx_txn.mt_numdbs = dbn+2; - mx->mx_cursor.mc_snum = 0; + mx->mx_cursor.mc_xcursor = NULL; mx->mx_cursor.mc_txn = &mx->mx_txn; + mx->mx_cursor.mc_snum = 0; mx->mx_cursor.mc_dbi = dbn+1; } static void -mdb_xcursor_init1(MDB_txn *txn, MDB_dbi dbi, MDB_xcursor *mx, MDB_page *mp, MDB_node *node) +mdb_xcursor_init1(MDB_cursor *mc, MDB_page *mp, MDB_node *node) { MDB_db *db = NODEDATA(node); + MDB_xcursor *mx = mc->mc_xcursor; MDB_dbi dbn; - mx->mx_dbs[0] = txn->mt_dbs[0]; - mx->mx_dbs[1] = txn->mt_dbs[1]; - if (dbi > 1) { - mx->mx_dbs[2] = txn->mt_dbs[dbi]; + mx->mx_dbs[0] = mc->mc_txn->mt_dbs[0]; + mx->mx_dbs[1] = mc->mc_txn->mt_dbs[1]; + if (mc->mc_dbi > 1) { + mx->mx_dbs[2] = mc->mc_txn->mt_dbs[mc->mc_dbi]; dbn = 3; } else { dbn = 2; } - DPRINTF("Sub-db %u for db %u root page %lu", dbn, dbi, db->md_root); + DPRINTF("Sub-db %u for db %u root page %lu", dbn, mc->mc_dbi, db->md_root); mx->mx_dbs[dbn] = *db; if (F_ISSET(mp->mp_flags, P_DIRTY)) mx->mx_dbxs[dbn].md_dirty = 1; mx->mx_dbxs[dbn].md_name.mv_data = NODEKEY(node); mx->mx_dbxs[dbn].md_name.mv_size = node->mn_ksize; - mx->mx_txn.mt_next_pgno = txn->mt_next_pgno; - mx->mx_txn.mt_u = txn->mt_u; + mx->mx_txn.mt_next_pgno = mc->mc_txn->mt_next_pgno; + mx->mx_txn.mt_u = mc->mc_txn->mt_u; mx->mx_cursor.mc_flags = 0; } +static void +mdb_xcursor_init2(MDB_cursor *mc) +{ + MDB_xcursor *mx = mc->mc_xcursor; + mx->mx_dbs[0] = mc->mc_txn->mt_dbs[0]; + mx->mx_dbs[1] = mc->mc_txn->mt_dbs[1]; + if (mc->mc_dbi > 1) { + mx->mx_dbs[2] = mc->mc_txn->mt_dbs[mc->mc_dbi]; + } + mx->mx_txn.mt_next_pgno = mc->mc_txn->mt_next_pgno; +} + static void mdb_xcursor_fini(MDB_cursor *mc) { MDB_xcursor *mx = mc->mc_xcursor; mc->mc_txn->mt_next_pgno = mx->mx_txn.mt_next_pgno; - mc->mc_txn->mt_u = mx->mx_txn.mt_u; mc->mc_txn->mt_dbs[0] = mx->mx_dbs[0]; mc->mc_txn->mt_dbs[1] = mx->mx_dbs[1]; mc->mc_txn->mt_dbxs[0].md_dirty = mx->mx_dbxs[0].md_dirty; @@ -3275,10 +3455,34 @@ mdb_cursor_count(MDB_cursor *mc, unsigned long *countp) return MDB_SUCCESS; } +static void +mdb_cursor_reset(MDB_cursor *mc) +{ + if (mc != NULL) { + if (mc->mc_flags & C_XDIRTY) { + + mdb_xcursor_fini(mc); + + /* If sub-DB still has entries, update root record */ + if (mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi].md_root + != P_INVALID) { + MDB_ppage *top; + MDB_node *leaf; + top = CURSOR_TOP(mc); + leaf = NODEPTR(top->mp_page, top->mp_ki); + memcpy(NODEDATA(leaf), + &mc->mc_xcursor->mx_txn.mt_dbs[mc->mc_xcursor->mx_cursor.mc_dbi], + sizeof(MDB_db)); + } + } + } +} + void mdb_cursor_close(MDB_cursor *cursor) { if (cursor != NULL) { + mdb_cursor_reset(cursor); free(cursor); } } @@ -3587,7 +3791,7 @@ mdb_rebalance(MDB_txn *txn, MDB_dbi dbi, MDB_pageparent *mpp) } static int -mdb_del0(MDB_txn *txn, MDB_dbi dbi, unsigned int ki, MDB_pageparent *mpp, MDB_node *leaf) +mdb_del0(MDB_cursor *mc, unsigned int ki, MDB_pageparent *mpp, MDB_node *leaf) { int rc; @@ -3597,18 +3801,18 @@ mdb_del0(MDB_txn *txn, MDB_dbi dbi, unsigned int ki, MDB_pageparent *mpp, MDB_no pgno_t pg; memcpy(&pg, NODEDATA(leaf), sizeof(pg)); - ovpages = OVPAGES(NODEDSZ(leaf), txn->mt_env->me_psize); + ovpages = OVPAGES(NODEDSZ(leaf), mc->mc_txn->mt_env->me_psize); for (i=0; imt_free_pgs, pg); + mdb_midl_insert(mc->mc_txn->mt_free_pgs, pg); pg++; } } - mdb_del_node(mpp->mp_page, ki, txn->mt_dbs[dbi].md_pad); - txn->mt_dbs[dbi].md_entries--; - rc = mdb_rebalance(txn, dbi, mpp); + mdb_del_node(mpp->mp_page, ki, mc->mc_txn->mt_dbs[mc->mc_dbi].md_pad); + mc->mc_txn->mt_dbs[mc->mc_dbi].md_entries--; + rc = mdb_rebalance(mc->mc_txn, mc->mc_dbi, mpp); if (rc != MDB_SUCCESS) - txn->mt_flags |= MDB_TXN_ERROR; + mc->mc_txn->mt_flags |= MDB_TXN_ERROR; return rc; } @@ -3617,10 +3821,11 @@ int mdb_del(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data) { + MDB_cursor mc; + MDB_xcursor mx; + MDB_cursor_op op; + MDB_val rdata, *xdata; int rc, exact; - unsigned int ki; - MDB_node *leaf; - MDB_pageparent mpp; DKBUF; assert(key != NULL); @@ -3638,72 +3843,32 @@ mdb_del(MDB_txn *txn, MDB_dbi dbi, return EINVAL; } - mpp.mp_parent = NULL; - mpp.mp_pi = 0; - if ((rc = mdb_search_page(txn, dbi, key, NULL, 1, &mpp)) != MDB_SUCCESS) - return rc; - - leaf = mdb_search_node(txn, dbi, mpp.mp_page, key, &exact, &ki); - if (leaf == NULL || !exact) { - return MDB_NOTFOUND; - } - - if (!IS_LEAF2(mpp.mp_page) && F_ISSET(leaf->mn_flags, F_DUPDATA)) { - MDB_cursor mc; - MDB_xcursor mx; - MDB_pageparent mp2; - - mc.mc_txn = txn; - mc.mc_dbi = dbi; - mc.mc_flags = 0; + mc.mc_txn = txn; + mc.mc_dbi = dbi; + mc.mc_flags = 0; + if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) { mc.mc_xcursor = &mx; mdb_xcursor_init0(&mc); - mdb_xcursor_init1(txn, dbi, &mx, mpp.mp_page, leaf); - if (data) { - rc = mdb_del(&mx.mx_txn, mx.mx_cursor.mc_dbi, data, NULL); - mdb_xcursor_fini(&mc); - /* If sub-DB still has entries, we're done */ - if (mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi].md_root != P_INVALID) { - memcpy(NODEDATA(leaf), &mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi], - sizeof(MDB_db)); - txn->mt_dbs[dbi].md_entries--; - return rc; - } - /* otherwise fall thru and delete the sub-DB */ - } else { - /* add all the child DB's pages to the free list */ - rc = mdb_search_page(&mx.mx_txn, mx.mx_cursor.mc_dbi, - NULL, &mx.mx_cursor, 0, &mp2); - if (rc == MDB_SUCCESS) { - MDB_ppage *top, *parent; - MDB_node *ni; - unsigned int i; - - cursor_pop_page(&mx.mx_cursor); - if (mx.mx_cursor.mc_snum) { - top = CURSOR_TOP(&mx.mx_cursor); - while (mx.mx_cursor.mc_snum > 1) { - parent = CURSOR_PARENT(&mx.mx_cursor); - for (i=0; imp_page); i++) { - ni = NODEPTR(top->mp_page, i); - mdb_midl_insert(txn->mt_free_pgs, NODEPGNO(ni)); - } - parent->mp_ki++; - if (parent->mp_ki >= NUMKEYS(parent->mp_page)) { - cursor_pop_page(&mx.mx_cursor); - top = parent; - } else { - ni = NODEPTR(parent->mp_page, parent->mp_ki); - rc = mdb_get_page(&mx.mx_txn, NODEPGNO(ni), &top->mp_page); - } - } - } - mdb_midl_insert(txn->mt_free_pgs, mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi].md_root); - } - } + } else { + mc.mc_xcursor = NULL; } - return mdb_del0(txn, dbi, ki, &mpp, leaf); + exact = 0; + if (data) { + op = MDB_GET_BOTH; + rdata = *data; + xdata = &rdata; + } else { + op = MDB_SET; + xdata = NULL; + } + rc = mdb_cursor_set(&mc, key, xdata, op, &exact); + if (rc == 0) + rc = mdb_cursor_del(&mc, data ? 0 : MDB_NODUPDATA); + if (mc.mc_flags & C_XDIRTY) { + mdb_cursor_reset(&mc); + } + return rc; } /* Split page <*mpp>, and insert in either left or @@ -3848,7 +4013,6 @@ mdb_split(MDB_txn *txn, MDB_dbi dbi, MDB_page **mpp, unsigned int *newindxp, /* First find the separating key between the split pages. */ - memset(&sepkey, 0, sizeof(sepkey)); if (newindx == split_indx) { sepkey.mv_size = newkey->mv_size; sepkey.mv_data = newkey->mv_data; @@ -3955,6 +4119,7 @@ newsep: return rc; } +#if 0 static int mdb_put0(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data, unsigned int flags) @@ -4110,6 +4275,7 @@ put_sub: done: return rc; } +#endif int mdb_put(MDB_txn *txn, MDB_dbi dbi, @@ -4147,14 +4313,8 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi, mc.mc_xcursor = NULL; } rc = mdb_cursor_put(&mc, key, data, flags); - if (mc.mc_xcursor) { - MDB_ppage *top; - MDB_node *leaf; - mdb_xcursor_fini(&mc); - top = CURSOR_TOP(&mc); - leaf = NODEPTR(top->mp_page, top->mp_ki); - memcpy(NODEDATA(leaf), &mx.mx_txn.mt_dbs[mx.mx_cursor.mc_dbi], - sizeof(MDB_db)); + if (mc.mc_flags & C_XDIRTY) { + mdb_cursor_reset(&mc); } return rc; } @@ -4252,13 +4412,17 @@ int mdb_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi) /* Create if requested */ if (rc == MDB_NOTFOUND && (flags & MDB_CREATE)) { + MDB_cursor mc; MDB_db dummy; data.mv_size = sizeof(MDB_db); data.mv_data = &dummy; memset(&dummy, 0, sizeof(dummy)); dummy.md_root = P_INVALID; dummy.md_flags = flags & 0xffff; - rc = mdb_put0(txn, MAIN_DBI, &key, &data, F_SUBDATA); + mc.mc_txn = txn; + mc.mc_dbi = MAIN_DBI; + mc.mc_flags = 0; + rc = mdb_cursor_put(&mc, &key, &data, F_SUBDATA); dirty = 1; }