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s3: Add dbwrap_cache
This is a caching layer for the notify database and potentially for the brlock database. It caches the parse_record operation as long as the underlying seqnum does not change.
This commit is contained in:
Volker Lendecke
parent
ba8f19c556
commit
bd9178506e
@ -262,6 +262,7 @@ TDB_LIB_OBJ = lib/util_tdb.o ../lib/util/util_tdb.o \
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lib/dbwrap/dbwrap_tdb.o \
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lib/dbwrap/dbwrap_ctdb.o \
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lib/g_lock.o \
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lib/dbwrap/dbwrap_cache.o \
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lib/dbwrap/dbwrap_rbt.o
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TDB_VALIDATE_OBJ = lib/tdb_validate.o
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210
source3/lib/dbwrap/dbwrap_cache.c
Normal file
210
source3/lib/dbwrap/dbwrap_cache.c
Normal file
@ -0,0 +1,210 @@
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/*
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Unix SMB/CIFS implementation.
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Cache db contents for parse_record based on seqnum
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Copyright (C) Volker Lendecke 2012
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "lib/dbwrap/dbwrap.h"
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#include "lib/dbwrap/dbwrap_private.h"
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#include "lib/dbwrap/dbwrap_rbt.h"
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#include "lib/dbwrap/dbwrap_cache.h"
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struct db_cache_ctx {
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int seqnum;
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struct db_context *backing;
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struct db_context *positive;
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struct db_context *negative;
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};
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static void dbwrap_cache_validate(struct db_cache_ctx *ctx)
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{
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if (ctx->seqnum == dbwrap_get_seqnum(ctx->backing)) {
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return;
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}
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TALLOC_FREE(ctx->positive);
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ctx->positive = db_open_rbt(ctx);
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TALLOC_FREE(ctx->negative);
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ctx->negative = db_open_rbt(ctx);
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}
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static NTSTATUS dbwrap_cache_parse_record(
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struct db_context *db, TDB_DATA key,
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void (*parser)(TDB_DATA key, TDB_DATA data, void *private_data),
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void *private_data)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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TDB_DATA value;
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NTSTATUS status;
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dbwrap_cache_validate(ctx);
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if (ctx->positive != NULL) {
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status = dbwrap_parse_record(
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ctx->positive, key, parser, private_data);
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if (NT_STATUS_IS_OK(status)) {
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return status;
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}
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}
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if ((ctx->negative != NULL) && dbwrap_exists(ctx->negative, key)) {
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return NT_STATUS_NOT_FOUND;
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}
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status = dbwrap_fetch(ctx->backing, talloc_tos(), key, &value);
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if (NT_STATUS_IS_OK(status)) {
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dbwrap_store(ctx->positive, key, value, 0);
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parser(key, value, private_data);
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TALLOC_FREE(value.dptr);
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return NT_STATUS_OK;
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}
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if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
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char c = '\0';
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value.dptr = (uint8_t *)&c;
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value.dsize = sizeof(c);
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dbwrap_store(ctx->negative, key, value, 0);
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return NT_STATUS_NOT_FOUND;
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}
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return status;
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}
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static struct db_record *dbwrap_cache_fetch_locked(
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struct db_context *db, TALLOC_CTX *mem_ctx, TDB_DATA key)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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return dbwrap_fetch_locked(ctx->backing, mem_ctx, key);
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}
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static int dbwrap_cache_traverse(struct db_context *db,
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int (*f)(struct db_record *rec,
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void *private_data),
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void *private_data)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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NTSTATUS status;
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int ret;
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status = dbwrap_traverse(ctx->backing, f, private_data, &ret);
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if (!NT_STATUS_IS_OK(status)) {
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return -1;
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}
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return ret;
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}
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static int dbwrap_cache_traverse_read(struct db_context *db,
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int (*f)(struct db_record *rec,
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void *private_data),
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void *private_data)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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NTSTATUS status;
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int ret;
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status = dbwrap_traverse_read(ctx->backing, f, private_data, &ret);
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if (!NT_STATUS_IS_OK(status)) {
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return -1;
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}
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return ret;
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}
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static int dbwrap_cache_get_seqnum(struct db_context *db)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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return dbwrap_get_seqnum(ctx->backing);
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}
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static int dbwrap_cache_get_flags(struct db_context *db)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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return dbwrap_get_flags(ctx->backing);
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}
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static int dbwrap_cache_transaction_start(struct db_context *db)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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return dbwrap_transaction_start(ctx->backing);
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}
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static int dbwrap_cache_transaction_commit(struct db_context *db)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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return dbwrap_transaction_commit(ctx->backing);
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}
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static int dbwrap_cache_transaction_cancel(struct db_context *db)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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return dbwrap_transaction_cancel(ctx->backing);
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}
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static int dbwrap_cache_exists(struct db_context *db, TDB_DATA key)
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{
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struct db_cache_ctx *ctx = talloc_get_type_abort(
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db->private_data, struct db_cache_ctx);
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if (ctx->positive && dbwrap_exists(ctx->positive, key)) {
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return true;
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}
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if (ctx->negative && dbwrap_exists(ctx->negative, key)) {
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return false;
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}
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return dbwrap_exists(ctx->backing, key);
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}
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struct db_context *db_open_cache(TALLOC_CTX *mem_ctx,
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struct db_context *backing)
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{
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struct db_context *db;
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struct db_cache_ctx *ctx;
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db = talloc(mem_ctx, struct db_context);
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if (db == NULL) {
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return NULL;
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}
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ctx = talloc_zero(db, struct db_cache_ctx);
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if (ctx == NULL) {
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TALLOC_FREE(db);
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return NULL;
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}
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ctx->seqnum = -1;
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ctx->backing = talloc_move(ctx, &backing);
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db->private_data = ctx;
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dbwrap_cache_validate(ctx);
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db->fetch_locked = dbwrap_cache_fetch_locked;
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db->traverse = dbwrap_cache_traverse;
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db->traverse_read = dbwrap_cache_traverse_read;
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db->get_seqnum = dbwrap_cache_get_seqnum;
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db->get_flags = dbwrap_cache_get_flags;
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db->transaction_start = dbwrap_cache_transaction_start;
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db->transaction_commit = dbwrap_cache_transaction_commit;
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db->transaction_cancel = dbwrap_cache_transaction_cancel;
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db->parse_record = dbwrap_cache_parse_record;
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db->exists = dbwrap_cache_exists;
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db->wipe = NULL;
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db->lock_order = 0;
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db->persistent = false;
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return db;
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}
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32
source3/lib/dbwrap/dbwrap_cache.h
Normal file
32
source3/lib/dbwrap/dbwrap_cache.h
Normal file
@ -0,0 +1,32 @@
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/*
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Unix SMB/CIFS implementation.
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Database interface wrapper around ctdbd
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Copyright (C) Volker Lendecke 2012
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __DBWRAP_CACHE_H__
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#define __DBWRAP_CACHE_H__
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#include <talloc.h>
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#include "dbwrap/dbwrap_private.h"
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struct db_context;
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struct db_context *db_open_cache(TALLOC_CTX *mem_ctx,
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struct db_context *backing);
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#endif /* __DBWRAP_CACHE_H__ */
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@ -1087,7 +1087,7 @@ bld.SAMBA3_SUBSYSTEM('tdb-wrap3',
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vars=locals())
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bld.SAMBA3_LIBRARY('dbwrap',
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source='lib/dbwrap/dbwrap.c lib/dbwrap/dbwrap_util.c lib/dbwrap/dbwrap_rbt.c',
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source='lib/dbwrap/dbwrap.c lib/dbwrap/dbwrap_util.c lib/dbwrap/dbwrap_rbt.c lib/dbwrap/dbwrap_cache.c',
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deps='samba-util UTIL_TDB errors',
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private_library=True)
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