/*
* __wt_metadata_search --
* Return a copied row from the metadata.
* The caller is responsible for freeing the allocated memory.
*/
int
__wt_metadata_search(
WT_SESSION_IMPL *session, const char *key, char **valuep)
{
WT_CURSOR *cursor;
WT_DECL_RET;
const char *value;
*valuep = NULL;
WT_RET(__wt_verbose(session, WT_VERB_METADATA,
"Search: key: %s, tracking: %s, %s" "turtle",
key, WT_META_TRACKING(session) ? "true" : "false",
__metadata_turtle(key) ? "" : "not "));
if (__metadata_turtle(key))
return (__wt_turtle_read(session, key, valuep));
WT_RET(__wt_metadata_cursor(session, NULL, &cursor));
cursor->set_key(cursor, key);
WT_ERR(cursor->search(cursor));
WT_ERR(cursor->get_value(cursor, &value));
WT_ERR(__wt_strdup(session, value, valuep));
err: WT_TRET(cursor->close(cursor));
return (ret);
}
/*
* __wt_metadata_search --
* Return a copied row from the metadata.
* The caller is responsible for freeing the allocated memory.
*/
int
__wt_metadata_search(WT_SESSION_IMPL *session, const char *key, char **valuep)
{
WT_CURSOR *cursor;
WT_DECL_RET;
const char *value;
*valuep = NULL;
__wt_verbose(session, WT_VERB_METADATA,
"Search: key: %s, tracking: %s, %s" "turtle",
key, WT_META_TRACKING(session) ? "true" : "false",
__metadata_turtle(key) ? "" : "not ");
if (__metadata_turtle(key)) {
/*
* The returned value should only be set if ret is non-zero, but
* Coverity is convinced otherwise. The code path is used enough
* that Coverity complains a lot, add an error check to get some
* peace and quiet.
*/
if ((ret = __wt_turtle_read(session, key, valuep)) != 0)
__wt_free(session, *valuep);
return (ret);
}
/*
* All metadata reads are at read-uncommitted isolation. That's
* because once a schema-level operation completes, subsequent
* operations must see the current version of checkpoint metadata, or
* they may try to read blocks that may have been freed from a file.
* Metadata updates use non-transactional techniques (such as the
* schema and metadata locks) to protect access to in-flight updates.
*/
WT_RET(__wt_metadata_cursor(session, &cursor));
cursor->set_key(cursor, key);
WT_WITH_TXN_ISOLATION(session, WT_ISO_READ_UNCOMMITTED,
ret = cursor->search(cursor));
WT_ERR(ret);
WT_ERR(cursor->get_value(cursor, &value));
WT_ERR(__wt_strdup(session, value, valuep));
err: WT_TRET(__wt_metadata_cursor_release(session, &cursor));
if (ret != 0)
__wt_free(session, *valuep);
return (ret);
}
/*
* __wt_metadata_search --
* Return a copied row from the metadata.
* The caller is responsible for freeing the allocated memory.
*/
int
__wt_metadata_search(
WT_SESSION_IMPL *session, const char *key, const char **valuep)
{
WT_CURSOR *cursor;
WT_DECL_RET;
const char *value;
*valuep = NULL;
if (__metadata_turtle(key))
return (__wt_turtle_read(session, key, valuep));
WT_RET(__wt_metadata_cursor(session, NULL, &cursor));
cursor->set_key(cursor, key);
WT_ERR(cursor->search(cursor));
WT_ERR(cursor->get_value(cursor, &value));
WT_ERR(__wt_strdup(session, value, valuep));
err: WT_TRET(cursor->close(cursor));
return (ret);
}
/*
* __wt_metadata_search --
* Return a copied row from the metadata.
* The caller is responsible for freeing the allocated memory.
*/
int
__wt_metadata_search(WT_SESSION_IMPL *session, const char *key, char **valuep)
{
WT_CURSOR *cursor;
WT_DECL_RET;
const char *value;
*valuep = NULL;
WT_RET(__wt_verbose(session, WT_VERB_METADATA,
"Search: key: %s, tracking: %s, %s" "turtle",
key, WT_META_TRACKING(session) ? "true" : "false",
__metadata_turtle(key) ? "" : "not "));
if (__metadata_turtle(key))
return (__wt_turtle_read(session, key, valuep));
/*
* All metadata reads are at read-uncommitted isolation. That's
* because once a schema-level operation completes, subsequent
* operations must see the current version of checkpoint metadata, or
* they may try to read blocks that may have been freed from a file.
* Metadata updates use non-transactional techniques (such as the
* schema and metadata locks) to protect access to in-flight updates.
*/
WT_RET(__wt_metadata_cursor(session, &cursor));
cursor->set_key(cursor, key);
WT_WITH_TXN_ISOLATION(session, WT_ISO_READ_UNCOMMITTED,
ret = cursor->search(cursor));
WT_ERR(ret);
WT_ERR(cursor->get_value(cursor, &value));
WT_ERR(__wt_strdup(session, value, valuep));
err: WT_TRET(__wt_metadata_cursor_release(session, &cursor));
return (ret);
}
