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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"
/*
* __drop_file --
* Drop a file.
*/
static int
__drop_file(
WT_SESSION_IMPL *session, const char *uri, bool force, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_DECL_RET;
bool remove_files;
const char *filename;
WT_RET(__wt_config_gets(session, cfg, "remove_files", &cval));
remove_files = cval.val != 0;
filename = uri;
if (!WT_PREFIX_SKIP(filename, "file:"))
return (__wt_unexpected_object_type(session, uri, "file:"));
WT_RET(__wt_schema_backup_check(session, filename));
/* Close all btree handles associated with this file. */
WT_WITH_HANDLE_LIST_WRITE_LOCK(session,
ret = __wt_conn_dhandle_close_all(session, uri, force));
WT_RET(ret);
/* Remove the metadata entry (ignore missing items). */
WT_TRET(__wt_metadata_remove(session, uri));
if (!remove_files)
return (ret);
/*
* Schedule the remove of the underlying physical file when the drop
* completes.
*/
WT_TRET(__wt_meta_track_drop(session, filename));
return (ret);
}
/*
* __drop_colgroup --
* WT_SESSION::drop for a colgroup.
*/
static int
__drop_colgroup(
WT_SESSION_IMPL *session, const char *uri, bool force, const char *cfg[])
{
WT_COLGROUP *colgroup;
WT_DECL_RET;
WT_TABLE *table;
WT_ASSERT(session, F_ISSET(session, WT_SESSION_LOCKED_TABLE));
/* If we can get the colgroup, detach it from the table. */
if ((ret = __wt_schema_get_colgroup(
session, uri, force, &table, &colgroup)) == 0) {
table->cg_complete = false;
WT_TRET(__wt_schema_drop(session, colgroup->source, cfg));
}
WT_TRET(__wt_metadata_remove(session, uri));
return (ret);
}
/*
* __drop_index --
* WT_SESSION::drop for an index.
*/
static int
__drop_index(
WT_SESSION_IMPL *session, const char *uri, bool force, const char *cfg[])
{
WT_INDEX *idx;
WT_DECL_RET;
WT_TABLE *table;
/* If we can get the index, detach it from the table. */
if ((ret = __wt_schema_get_index(
session, uri, force, &table, &idx)) == 0) {
table->idx_complete = false;
WT_TRET(__wt_schema_drop(session, idx->source, cfg));
}
WT_TRET(__wt_metadata_remove(session, uri));
return (ret);
}
/*
* __drop_table --
* WT_SESSION::drop for a table.
*/
static int
__drop_table(WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_COLGROUP *colgroup;
WT_DECL_RET;
WT_INDEX *idx;
WT_TABLE *table;
const char *name;
u_int i;
name = uri;
(void)WT_PREFIX_SKIP(name, "table:");
table = NULL;
WT_ERR(__wt_schema_get_table(
session, name, strlen(name), true, &table));
/* Drop the column groups. */
for (i = 0; i < WT_COLGROUPS(table); i++) {
if ((colgroup = table->cgroups[i]) == NULL)
continue;
/*
* Drop 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_drop(session, colgroup->source, cfg));
WT_ERR(__wt_metadata_remove(session, colgroup->name));
}
/* Drop the indices. */
WT_ERR(__wt_schema_open_indices(session, table));
for (i = 0; i < table->nindices; i++) {
if ((idx = table->indices[i]) == NULL)
continue;
/*
* Drop the index before updating the metadata to avoid
* the metadata for the table becoming inconsistent if we can't
* get exclusive access.
*/
WT_ERR(__wt_schema_drop(session, idx->source, cfg));
WT_ERR(__wt_metadata_remove(session, idx->name));
}
WT_ERR(__wt_schema_remove_table(session, table));
table = NULL;
/* Remove the metadata entry (ignore missing items). */
WT_ERR(__wt_metadata_remove(session, uri));
err: if (table != NULL)
__wt_schema_release_table(session, table);
return (ret);
}
/*
* __wt_schema_drop --
* Process a WT_SESSION::drop operation for all supported types.
*/
int
__wt_schema_drop(WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_DATA_SOURCE *dsrc;
WT_DECL_RET;
bool force;
WT_RET(__wt_config_gets_def(session, cfg, "force", 0, &cval));
force = cval.val != 0;
WT_RET(__wt_meta_track_on(session));
/* Paranoia: clear any handle from our caller. */
session->dhandle = NULL;
if (WT_PREFIX_MATCH(uri, "colgroup:"))
ret = __drop_colgroup(session, uri, force, cfg);
else if (WT_PREFIX_MATCH(uri, "file:"))
ret = __drop_file(session, uri, force, cfg);
else if (WT_PREFIX_MATCH(uri, "index:"))
ret = __drop_index(session, uri, force, cfg);
else if (WT_PREFIX_MATCH(uri, "lsm:"))
ret = __wt_lsm_tree_drop(session, uri, cfg);
else if (WT_PREFIX_MATCH(uri, "table:"))
ret = __drop_table(session, uri, cfg);
else if ((dsrc = __wt_schema_get_source(session, uri)) != NULL)
ret = dsrc->drop == NULL ?
__wt_object_unsupported(session, uri) :
dsrc->drop(
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. Map ENOENT to zero if force is set.
*/
if (ret == WT_NOTFOUND || ret == ENOENT)
ret = force ? 0 : 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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