1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*-
* 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"
/*
* __wt_alter --
* Alter a file.
*/
int
__wt_alter(WT_SESSION_IMPL *session, const char *newcfg[])
{
WT_DECL_RET;
const char *cfg[4], *filename, *uri;
char *config, *newconfig;
uri = session->dhandle->name;
WT_RET(__wt_meta_track_on(session));
/*
* We know that we have exclusive access to the file. So it will be
* closed after we're done with it and the next open will see the
* updated metadata.
*/
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);
/*
* Map WT_NOTFOUND to ENOENT, based on the assumption WT_NOTFOUND means
* there was no metadata entry.
*/
if (ret == WT_NOTFOUND)
ret = ENOENT;
WT_TRET(__wt_meta_track_off(session, true, ret != 0));
return (ret);
}
|
