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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"
/*
* __rename_file --
* WT_SESSION::rename for a file.
*/
static int
__rename_file(
WT_SESSION_IMPL *session, const char *uri, const char *newuri)
{
WT_DECL_RET;
const char *filename, *newfile;
char *newvalue, *oldvalue;
bool exist;
newvalue = oldvalue = NULL;
filename = uri;
WT_PREFIX_SKIP_REQUIRED(session, filename, "file:");
newfile = newuri;
WT_PREFIX_SKIP_REQUIRED(session, newfile, "file:");
WT_RET(__wt_schema_backup_check(session, filename));
WT_RET(__wt_schema_backup_check(session, newfile));
/* Close any btree handles in the file. */
WT_WITH_HANDLE_LIST_WRITE_LOCK(session,
ret = __wt_conn_dhandle_close_all(session, uri, true, false));
WT_ERR(ret);
/*
* First, check if the file being renamed exists in the system. Doing
* this check first matches the table rename behavior because we return
* WT_NOTFOUND when the renamed file doesn't exist (subsequently mapped
* to ENOENT by the session layer).
*/
WT_ERR(__wt_metadata_search(session, uri, &oldvalue));
/*
* Check to see if the proposed name is already in use, in either the
* metadata or the filesystem.
*/
switch (ret = __wt_metadata_search(session, newuri, &newvalue)) {
case 0:
WT_ERR_MSG(session, EEXIST, "%s", newuri);
/* NOTREACHED */
case WT_NOTFOUND:
break;
default:
WT_ERR(ret);
}
WT_ERR(__wt_fs_exist(session, newfile, &exist));
if (exist)
WT_ERR_MSG(session, EEXIST, "%s", newfile);
/* Replace the old file entries with new file entries. */
WT_ERR(__wt_metadata_remove(session, uri));
WT_ERR(__wt_metadata_insert(session, newuri, oldvalue));
/* Rename the underlying file. */
WT_ERR(__wt_fs_rename(session, filename, newfile, false));
if (WT_META_TRACKING(session))
WT_ERR(__wt_meta_track_fileop(session, uri, newuri));
err: __wt_free(session, newvalue);
__wt_free(session, oldvalue);
return (ret);
}
/*
* __rename_tree --
* Rename an index or colgroup reference.
*/
static int
__rename_tree(WT_SESSION_IMPL *session,
WT_TABLE *table, const char *newuri, const char *name, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_DECL_ITEM(nn);
WT_DECL_ITEM(ns);
WT_DECL_ITEM(nv);
WT_DECL_ITEM(os);
WT_DECL_RET;
const char *newname, *olduri, *suffix;
char *value;
bool is_colgroup;
olduri = table->iface.name;
value = NULL;
newname = newuri;
WT_PREFIX_SKIP_REQUIRED(session, newname, "table:");
/*
* Create the new data source URI and update the schema value.
*
* 'name' has the format (colgroup|index):<tablename>[:<suffix>];
* we need the suffix.
*/
is_colgroup = WT_PREFIX_MATCH(name, "colgroup:");
if (!is_colgroup && !WT_PREFIX_MATCH(name, "index:"))
WT_ERR_MSG(session, EINVAL,
"expected a 'colgroup:' or 'index:' source: '%s'", name);
suffix = strchr(name, ':');
/* An existing table should have a well formed name. */
WT_ASSERT(session, suffix != NULL);
suffix = strchr(suffix + 1, ':');
WT_ERR(__wt_scr_alloc(session, 0, &nn));
WT_ERR(__wt_buf_fmt(session, nn, "%s%s%s",
is_colgroup ? "colgroup:" : "index:",
newname,
(suffix == NULL) ? "" : suffix));
/* Skip the colon, if any. */
if (suffix != NULL)
++suffix;
/* Read the old schema value. */
WT_ERR(__wt_metadata_search(session, name, &value));
/*
* Calculate the new data source URI. Use the existing table structure
* and substitute the new name temporarily.
*/
WT_ERR(__wt_scr_alloc(session, 0, &ns));
table->iface.name = newuri;
if (is_colgroup)
WT_ERR(__wt_schema_colgroup_source(
session, table, suffix, value, ns));
else
WT_ERR(__wt_schema_index_source(
session, table, suffix, value, ns));
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);
/* Take a copy of the old data source. */
WT_ERR(__wt_scr_alloc(session, 0, &os));
WT_ERR(__wt_buf_fmt(session, os, "%.*s", (int)cval.len, cval.str));
/* Overwrite it with the new data source. */
WT_ERR(__wt_scr_alloc(session, 0, &nv));
WT_ERR(__wt_buf_fmt(session, nv, "%.*s%s%s",
(int)WT_PTRDIFF(cval.str, value), value,
(const char *)ns->data, cval.str + cval.len));
/*
* Do the rename before updating the metadata to avoid leaving the
* metadata inconsistent if the rename fails.
*/
WT_ERR(__wt_schema_rename(session, os->data, ns->data, cfg));
/*
* Remove the old metadata entry.
* Insert the new metadata entry.
*/
WT_ERR(__wt_metadata_remove(session, name));
WT_ERR(__wt_metadata_insert(session, nn->data, nv->data));
err: __wt_scr_free(session, &nn);
__wt_scr_free(session, &ns);
__wt_scr_free(session, &nv);
__wt_scr_free(session, &os);
__wt_free(session, value);
table->iface.name = olduri;
return (ret);
}
/*
* __metadata_rename --
* Rename an entry in the metadata table.
*/
static int
__metadata_rename(WT_SESSION_IMPL *session, const char *uri, const char *newuri)
{
WT_DECL_RET;
char *value;
WT_RET(__wt_metadata_search(session, uri, &value));
WT_ERR(__wt_metadata_remove(session, uri));
WT_ERR(__wt_metadata_insert(session, newuri, value));
err: __wt_free(session, value);
return (ret);
}
/*
* __rename_table --
* WT_SESSION::rename for a table.
*/
static int
__rename_table(WT_SESSION_IMPL *session,
const char *uri, const char *newuri, const char *cfg[])
{
WT_DECL_RET;
WT_TABLE *table;
u_int i;
const char *oldname;
bool tracked;
oldname = uri;
(void)WT_PREFIX_SKIP(oldname, "table:");
tracked = false;
/*
* Open the table so we can rename its column groups and indexes.
*
* Ideally we would keep the table locked exclusive across the rename,
* but for now we rely on the global table lock to prevent the table
* being reopened while it is being renamed. One issue is that the
* WT_WITHOUT_LOCKS macro can drop and reacquire the global table lock,
* avoiding deadlocks while waiting for LSM operation to quiesce.
*/
WT_RET(__wt_schema_get_table(
session, oldname, strlen(oldname), false, 0, &table));
/* Rename the column groups. */
for (i = 0; i < WT_COLGROUPS(table); i++)
WT_ERR(__rename_tree(session, table, newuri,
table->cgroups[i]->name, cfg));
/* Rename the indices. */
WT_ERR(__wt_schema_open_indices(session, table));
for (i = 0; i < table->nindices; i++)
WT_ERR(__rename_tree(session, table, newuri,
table->indices[i]->name, cfg));
/* Make sure the table data handle is closed. */
WT_TRET(__wt_schema_release_table(session, table));
WT_ERR(__wt_schema_get_table_uri(
session, uri, true, WT_DHANDLE_EXCLUSIVE, &table));
F_SET(&table->iface, WT_DHANDLE_DISCARD);
if (WT_META_TRACKING(session)) {
WT_WITH_DHANDLE(session, &table->iface,
ret = __wt_meta_track_handle_lock(session, false));
WT_ERR(ret);
tracked = true;
}
/* Rename the table. */
ret = __metadata_rename(session, uri, newuri);
err: if (!tracked)
WT_TRET(__wt_schema_release_table(session, table));
return (ret);
}
/*
* __schema_rename --
* WT_SESSION::rename.
*/
static int
__schema_rename(WT_SESSION_IMPL *session,
const char *uri, const char *newuri, const char *cfg[])
{
WT_DATA_SOURCE *dsrc;
WT_DECL_RET;
const char *p, *t;
/* The target type must match the source type. */
for (p = uri, t = newuri; *p == *t && *p != ':'; ++p, ++t)
;
if (*p != ':' || *t != ':')
WT_RET_MSG(session, EINVAL,
"rename target type must match URI: %s to %s", uri, newuri);
/*
* We track rename operations, if we fail in the middle, we want to
* back it all out.
*/
WT_RET(__wt_meta_track_on(session));
if (WT_PREFIX_MATCH(uri, "file:"))
ret = __rename_file(session, uri, newuri);
else if (WT_PREFIX_MATCH(uri, "lsm:"))
ret = __wt_lsm_tree_rename(session, uri, newuri, cfg);
else if (WT_PREFIX_MATCH(uri, "table:"))
ret = __rename_table(session, uri, newuri, cfg);
else if ((dsrc = __wt_schema_get_source(session, uri)) != NULL)
ret = dsrc->rename == NULL ?
__wt_object_unsupported(session, uri) :
dsrc->rename(dsrc,
&session->iface, uri, newuri, (WT_CONFIG_ARG *)cfg);
else
ret = __wt_bad_object_type(session, uri);
WT_TRET(__wt_meta_track_off(session, true, ret != 0));
/* If we didn't find a metadata entry, map that error to ENOENT. */
return (ret == WT_NOTFOUND ? ENOENT : ret);
}
/*
* __wt_schema_rename --
* WT_SESSION::rename.
*/
int
__wt_schema_rename(WT_SESSION_IMPL *session,
const char *uri, const char *newuri, const char *cfg[])
{
WT_DECL_RET;
WT_SESSION_IMPL *int_session;
WT_RET(__wt_schema_internal_session(session, &int_session));
ret = __schema_rename(int_session, uri, newuri, cfg);
WT_TRET(__wt_schema_session_release(session, int_session));
return (ret);
}
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