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/*-
* Copyright (c) 2014-2019 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __truncate_table --
* WT_SESSION::truncate for a table.
*/
static int
__truncate_table(WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_DECL_RET;
WT_TABLE *table;
u_int i;
WT_RET(__wt_schema_get_table(
session, uri, strlen(uri), false, 0, &table));
WT_STAT_DATA_INCR(session, cursor_truncate);
/* Truncate the column groups. */
for (i = 0; i < WT_COLGROUPS(table); i++)
WT_ERR(__wt_schema_truncate(
session, table->cgroups[i]->source, cfg));
/* Truncate the indices. */
WT_ERR(__wt_schema_open_indices(session, table));
for (i = 0; i < table->nindices; i++)
WT_ERR(__wt_schema_truncate(
session, table->indices[i]->source, cfg));
err: WT_TRET(__wt_schema_release_table(session, table));
return (ret);
}
/*
* __truncate_dsrc --
* WT_SESSION::truncate for a data-source without a truncate operation.
*/
static int
__truncate_dsrc(WT_SESSION_IMPL *session, const char *uri)
{
WT_CURSOR *cursor;
WT_DECL_RET;
const char *cfg[2];
/* Open a cursor and traverse the object, removing every entry. */
cfg[0] = WT_CONFIG_BASE(session, WT_SESSION_open_cursor);
cfg[1] = NULL;
WT_RET(__wt_open_cursor(session, uri, NULL, cfg, &cursor));
while ((ret = cursor->next(cursor)) == 0)
WT_ERR(cursor->remove(cursor));
WT_ERR_NOTFOUND_OK(ret);
WT_STAT_DATA_INCR(session, cursor_truncate);
err: WT_TRET(cursor->close(cursor));
return (ret);
}
/*
* __wt_schema_truncate --
* WT_SESSION::truncate without a range.
*/
int
__wt_schema_truncate(
WT_SESSION_IMPL *session, const char *uri, const char *cfg[])
{
WT_DATA_SOURCE *dsrc;
WT_DECL_RET;
const char *tablename;
tablename = uri;
if (WT_PREFIX_MATCH(uri, "file:"))
/*
* File truncate translates into a range truncate.
*/
ret = __wt_session_range_truncate(session, uri, NULL, NULL);
else if (WT_PREFIX_MATCH(uri, "lsm:"))
ret = __wt_lsm_tree_truncate(session, uri, cfg);
else if (WT_PREFIX_SKIP(tablename, "table:"))
ret = __truncate_table(session, tablename, cfg);
else if ((dsrc = __wt_schema_get_source(session, uri)) != NULL)
ret = dsrc->truncate == NULL ?
__truncate_dsrc(session, uri) :
dsrc->truncate(
dsrc, &session->iface, uri, (WT_CONFIG_ARG *)cfg);
else
ret = __wt_bad_object_type(session, uri);
/* If we didn't find a metadata entry, map that error to ENOENT. */
return (ret == WT_NOTFOUND ? ENOENT : ret);
}
/*
* __wt_range_truncate --
* Truncate of a cursor range, default implementation.
*/
int
__wt_range_truncate(WT_CURSOR *start, WT_CURSOR *stop)
{
WT_DECL_RET;
int cmp;
if (start == NULL) {
do {
WT_RET(stop->remove(stop));
} while ((ret = stop->prev(stop)) == 0);
WT_RET_NOTFOUND_OK(ret);
} else {
cmp = -1;
do {
if (stop != NULL)
WT_RET(start->compare(start, stop, &cmp));
WT_RET(start->remove(start));
} while (cmp < 0 && (ret = start->next(start)) == 0);
WT_RET_NOTFOUND_OK(ret);
}
return (0);
}
/*
* __wt_schema_range_truncate --
* WT_SESSION::truncate with a range.
*/
int
__wt_schema_range_truncate(
WT_SESSION_IMPL *session, WT_CURSOR *start, WT_CURSOR *stop)
{
WT_DATA_SOURCE *dsrc;
WT_DECL_RET;
const char *uri;
uri = start->internal_uri;
if (WT_PREFIX_MATCH(uri, "file:")) {
WT_ERR(__cursor_needkey(start));
if (stop != NULL)
WT_ERR(__cursor_needkey(stop));
WT_WITH_BTREE(session, ((WT_CURSOR_BTREE *)start)->btree,
ret = __wt_btcur_range_truncate(
(WT_CURSOR_BTREE *)start, (WT_CURSOR_BTREE *)stop));
} else if (WT_PREFIX_MATCH(uri, "table:"))
ret = __wt_table_range_truncate(
(WT_CURSOR_TABLE *)start, (WT_CURSOR_TABLE *)stop);
else if ((dsrc = __wt_schema_get_source(session, uri)) != NULL &&
dsrc->range_truncate != NULL)
ret = dsrc->range_truncate(dsrc, &session->iface, start, stop);
else
ret = __wt_range_truncate(start, stop);
err:
return (ret);
}
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