Age Owner TLA Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * fsmfuncs.c
4 : * Functions to investigate FSM pages
5 : *
6 : * These functions are restricted to superusers for the fear of introducing
7 : * security holes if the input checking isn't as water-tight as it should.
8 : * You'd need to be superuser to obtain a raw page image anyway, so
9 : * there's hardly any use case for using these without superuser-rights
10 : * anyway.
11 : *
12 : * Copyright (c) 2007-2023, PostgreSQL Global Development Group
13 : *
14 : * IDENTIFICATION
15 : * contrib/pageinspect/fsmfuncs.c
16 : *
17 : *-------------------------------------------------------------------------
18 : */
19 :
20 : #include "postgres.h"
21 :
22 : #include "funcapi.h"
23 : #include "lib/stringinfo.h"
24 : #include "miscadmin.h"
25 : #include "pageinspect.h"
26 : #include "storage/fsm_internals.h"
27 : #include "utils/builtins.h"
28 :
29 : /*
30 : * Dumps the contents of a FSM page.
31 : */
5304 heikki.linnakangas 32 CBC 7 : PG_FUNCTION_INFO_V1(fsm_page_contents);
33 :
34 : Datum
35 3 : fsm_page_contents(PG_FUNCTION_ARGS)
36 : {
37 3 : bytea *raw_page = PG_GETARG_BYTEA_P(0);
38 : StringInfoData sinfo;
39 : Page page;
40 : FSMPage fsmpage;
41 : int i;
42 :
43 3 : if (!superuser())
5304 heikki.linnakangas 44 UBC 0 : ereport(ERROR,
45 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
46 : errmsg("must be superuser to use raw page functions")));
47 :
389 michael 48 CBC 3 : page = get_page_from_raw(raw_page);
49 :
360 50 2 : if (PageIsNew(page))
51 1 : PG_RETURN_NULL();
52 :
389 53 1 : fsmpage = (FSMPage) PageGetContents(page);
54 :
5304 heikki.linnakangas 55 1 : initStringInfo(&sinfo);
56 :
5050 bruce 57 8165 : for (i = 0; i < NodesPerPage; i++)
58 : {
5304 heikki.linnakangas 59 8164 : if (fsmpage->fp_nodes[i] != 0)
60 13 : appendStringInfo(&sinfo, "%d: %d\n", i, fsmpage->fp_nodes[i]);
61 : }
62 1 : appendStringInfo(&sinfo, "fp_next_slot: %d\n", fsmpage->fp_next_slot);
63 :
3429 rhaas 64 1 : PG_RETURN_TEXT_P(cstring_to_text_with_len(sinfo.data, sinfo.len));
65 : }
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