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/*-
* Copyright (c) 2014-2017 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __alter_file --
* Alter a file.
*/
static int
__alter_file(WT_SESSION_IMPL *session, const char *uri, const char *newcfg[])
{
WT_DECL_RET;
const char *cfg[4], *filename;
char *config, *newconfig;
filename = uri;
newconfig = NULL;
if (!WT_PREFIX_SKIP(filename, "file:"))
return (__wt_unexpected_object_type(session, uri, "file:"));
/* 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] = WT_CONFIG_BASE(session, file_meta);
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);
return (ret);
}
/*
* __alter_colgroup --
* WT_SESSION::alter for a colgroup.
*/
static int
__alter_colgroup(
WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_COLGROUP *colgroup;
WT_DECL_RET;
WT_ASSERT(session, F_ISSET(session, WT_SESSION_LOCKED_TABLE));
/* If we can get the colgroup, perform any potential alterations. */
if ((ret = __wt_schema_get_colgroup(
session, uri, false, NULL, &colgroup)) == 0)
WT_TRET(__wt_schema_alter(session, colgroup->source, cfg));
return (ret);
}
/*
* __alter_index --
* WT_SESSION::alter for an index.
*/
static int
__alter_index(
WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_INDEX *idx;
WT_DECL_RET;
/* If we can get the index, perform any potential alterations. */
if ((ret = __wt_schema_get_index(
session, uri, false, NULL, &idx)) == 0)
WT_TRET(__wt_schema_alter(session, idx->source, cfg));
return (ret);
}
/*
* __alter_table --
* WT_SESSION::alter for a table.
*/
static int
__alter_table(WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_COLGROUP *colgroup;
WT_DECL_RET;
WT_TABLE *table;
const char *name;
u_int i;
name = uri;
(void)WT_PREFIX_SKIP(name, "table:");
WT_RET(__wt_schema_get_table(
session, name, strlen(name), true, &table));
/*
* Alter the column groups only if we are using the default
* column group. Otherwise the user should alter each
* index or column group explicitly.
*/
if (table->ncolgroups == 0)
for (i = 0; i < WT_COLGROUPS(table); i++) {
if ((colgroup = table->cgroups[i]) == NULL)
continue;
/*
* Alter the column group before updating the metadata
* to avoid the metadata for the table becoming
* inconsistent if we can't get exclusive access.
*/
WT_ERR(__wt_schema_alter(
session, colgroup->source, cfg));
}
err: __wt_schema_release_table(session, table);
return (ret);
}
/*
* __wt_schema_alter --
* Process a WT_SESSION::alter operation for all supported types.
*/
int
__wt_schema_alter(WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_DATA_SOURCE *dsrc;
WT_DECL_RET;
WT_RET(__wt_meta_track_on(session));
/* Paranoia: clear any handle from our caller. */
session->dhandle = NULL;
if (WT_PREFIX_MATCH(uri, "colgroup:"))
ret = __alter_colgroup(session, uri, cfg);
else if (WT_PREFIX_MATCH(uri, "file:"))
ret = __alter_file(session, uri, cfg);
else if (WT_PREFIX_MATCH(uri, "index:"))
ret = __alter_index(session, uri, cfg);
else if (WT_PREFIX_MATCH(uri, "lsm:"))
ret = __wt_lsm_tree_alter(session, uri, cfg);
else if (WT_PREFIX_MATCH(uri, "table:"))
ret = __alter_table(session, uri, cfg);
else if ((dsrc = __wt_schema_get_source(session, uri)) != NULL)
ret = dsrc->alter == NULL ?
__wt_object_unsupported(session, uri) :
dsrc->alter(dsrc,
&session->iface, uri, (WT_CONFIG_ARG *)cfg);
else
ret = __wt_bad_object_type(session, uri);
/*
* Map WT_NOTFOUND to ENOENT, based on the assumption WT_NOTFOUND means
* there was no metadata entry.
*/
if (ret == WT_NOTFOUND)
ret = ENOENT;
/* Bump the schema generation so that stale data is ignored. */
(void)__wt_gen_next(session, WT_GEN_SCHEMA);
WT_TRET(__wt_meta_track_off(session, true, ret != 0));
return (ret);
}
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