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/*-
* Copyright (c) 2014-2018 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
static int __schema_alter(WT_SESSION_IMPL *, const char *, const char *[]);
/*
* __alter_apply --
* Alter an object
*/
static int
__alter_apply(WT_SESSION_IMPL *session,
const char *uri, const char *newcfg[], const char *base_config)
{
WT_DECL_RET;
const char *cfg[4];
char *config, *newconfig;
newconfig = NULL;
/* Find the URI */
WT_RET(__wt_metadata_search(session, uri, &config));
WT_ASSERT(session, newcfg[0] != NULL);
/*
* Start with the base configuration because collapse is like
* a projection and if we are reading older metadata, it may not
* have all the components.
*/
cfg[0] = base_config;
cfg[1] = config;
cfg[2] = newcfg[0];
cfg[3] = NULL;
WT_ERR(__wt_config_collapse(session, cfg, &newconfig));
/*
* Only rewrite if there are changes.
*/
if (strcmp(config, newconfig) != 0)
WT_ERR(__wt_metadata_update(session, uri, newconfig));
else
WT_STAT_CONN_INCR(session, session_table_alter_skip);
err: __wt_free(session, config);
__wt_free(session, newconfig);
/*
* Map WT_NOTFOUND to ENOENT, based on the assumption WT_NOTFOUND means
* there was no metadata entry.
*/
if (ret == WT_NOTFOUND)
ret = __wt_set_return(session, ENOENT);
return (ret);
}
/*
* __alter_file --
* Alter a file.
*/
static int
__alter_file(WT_SESSION_IMPL *session, const char *newcfg[])
{
const char *uri;
/*
* We know that we have exclusive access to the file. So it will be
* closed after we're done with it and the next open will see the
* updated metadata.
*/
uri = session->dhandle->name;
if (!WT_PREFIX_MATCH(uri, "file:"))
return (__wt_unexpected_object_type(session, uri, "file:"));
return (__alter_apply(session,
uri, newcfg, WT_CONFIG_BASE(session, file_meta)));
}
/*
* __alter_tree --
* Alter an index or colgroup reference.
*/
static int
__alter_tree(WT_SESSION_IMPL *session, const char *name, const char *newcfg[])
{
WT_CONFIG_ITEM cval;
WT_DECL_ITEM(data_source);
WT_DECL_RET;
char *value;
bool is_colgroup;
value = NULL;
is_colgroup = WT_PREFIX_MATCH(name, "colgroup:");
if (!is_colgroup && !WT_PREFIX_MATCH(name, "index:"))
return (__wt_unexpected_object_type(
session, name, "'colgroup:' or 'index:'"));
/* Read the schema value. */
WT_ERR(__wt_metadata_search(session, name, &value));
/* Get the data source URI. */
if ((ret = __wt_config_getones(session, value, "source", &cval)) != 0)
WT_ERR_MSG(session, EINVAL,
"index or column group has no data source: %s", value);
WT_ERR(__wt_scr_alloc(session, 0, &data_source));
WT_ERR(__wt_buf_fmt(session,
data_source, "%.*s", (int)cval.len, cval.str));
/* Alter the data source */
WT_ERR(__schema_alter(session, data_source->data, newcfg));
/* Alter the index or colgroup */
if (is_colgroup)
WT_ERR(__alter_apply(session,
name, newcfg, WT_CONFIG_BASE(session, colgroup_meta)));
else
WT_ERR(__alter_apply(session,
name, newcfg, WT_CONFIG_BASE(session, index_meta)));
err: __wt_scr_free(session, &data_source);
__wt_free(session, value);
return (ret);
}
/*
* __alter_table --
* Alter a table.
*/
static int
__alter_table(WT_SESSION_IMPL *session,
const char *uri, const char *newcfg[], bool exclusive_refreshed)
{
WT_COLGROUP *colgroup;
WT_DECL_RET;
WT_INDEX *idx;
WT_TABLE *table;
u_int i;
const char *name;
colgroup = NULL;
table = NULL;
name = uri;
WT_PREFIX_SKIP_REQUIRED(session, name, "table:");
/*
* If we have exclusive access update all objects in the schema for
* this table and reopen the handle to update the in-memory state.
*/
if (exclusive_refreshed) {
/*
* Open the table so we can alter its column groups and indexes,
* keeping the table locked exclusive across the alter.
*/
WT_RET(__wt_schema_get_table_uri(session, uri, true,
WT_DHANDLE_EXCLUSIVE, &table));
/*
* Meta tracking needs to be used because alter needs to be
* atomic.
*/
WT_ASSERT(session, WT_META_TRACKING(session));
WT_WITH_DHANDLE(session, &table->iface,
ret = __wt_meta_track_handle_lock(session, false));
WT_RET(ret);
/* Alter the column groups. */
for (i = 0; i < WT_COLGROUPS(table); i++) {
if ((colgroup = table->cgroups[i]) == NULL)
continue;
WT_RET(__alter_tree(session, colgroup->name, newcfg));
}
/* Alter the indices. */
WT_RET(__wt_schema_open_indices(session, table));
for (i = 0; i < table->nindices; i++) {
if ((idx = table->indices[i]) == NULL)
continue;
WT_RET(__alter_tree(session, idx->name, newcfg));
}
}
/* Alter the table */
WT_RET(__alter_apply(session,
uri, newcfg, WT_CONFIG_BASE(session, table_meta)));
return (ret);
}
/*
* __schema_alter --
* Alter an object.
*/
static int
__schema_alter(WT_SESSION_IMPL *session, const char *uri, const char *newcfg[])
{
WT_CONFIG_ITEM cv;
uint32_t flags;
bool exclusive_refreshed;
const char *cfg[] = {
WT_CONFIG_BASE(session, WT_SESSION_alter), newcfg[0], NULL};
/*
* Determine what configuration says about exclusive access.
* A non exclusive alter that doesn't refresh in-memory configuration is
* only valid for the table objects.
*/
WT_RET(__wt_config_gets(session, cfg, "exclusive_refreshed", &cv));
exclusive_refreshed = (bool)cv.val;
if (!exclusive_refreshed && !WT_PREFIX_MATCH(uri, "table:"))
WT_RET_MSG(session, EINVAL,
"option \"exclusive_refreshed\" "
"is applicable only on simple tables");
/*
* The alter flag is used so LSM can apply some special logic, the
* exclusive flag avoids conflicts with other operations and the lock
* only flag is required because we don't need to have a handle to
* update the metadata and opening the handle causes problems when
* meta tracking is enabled.
*/
flags = WT_BTREE_ALTER | WT_DHANDLE_EXCLUSIVE | WT_DHANDLE_LOCK_ONLY;
if (WT_PREFIX_MATCH(uri, "file:"))
return (__wt_exclusive_handle_operation(
session, uri, __alter_file, newcfg, flags));
if (WT_PREFIX_MATCH(uri, "colgroup:") ||
WT_PREFIX_MATCH(uri, "index:"))
return (__alter_tree(session, uri, newcfg));
if (WT_PREFIX_MATCH(uri, "lsm:"))
return (__wt_lsm_tree_worker(session, uri, __alter_file,
NULL, newcfg, flags));
if (WT_PREFIX_MATCH(uri, "table:"))
return (__alter_table(session,
uri, newcfg, exclusive_refreshed));
return (__wt_bad_object_type(session, uri));
}
/*
* __wt_schema_alter --
* Alter an object.
*/
int
__wt_schema_alter(WT_SESSION_IMPL *session,
const char *uri, const char *newcfg[])
{
WT_DECL_RET;
WT_RET(__wt_meta_track_on(session));
ret = __schema_alter(session, uri, newcfg);
WT_TRET(__wt_meta_track_off(session, true, ret != 0));
return (ret);
}
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