1 /*-------------------------------------------------------------------------
4 * Functions to investigate FSM pages
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
12 * Copyright (c) 2007-2024, PostgreSQL Global Development Group
15 * contrib/pageinspect/fsmfuncs.c
17 *-------------------------------------------------------------------------
23 #include "lib/stringinfo.h"
24 #include "miscadmin.h"
25 #include "pageinspect.h"
26 #include "storage/fsm_internals.h"
27 #include "utils/builtins.h"
30 * Dumps the contents of a FSM page.
32 PG_FUNCTION_INFO_V1(fsm_page_contents
);
35 fsm_page_contents(PG_FUNCTION_ARGS
)
37 bytea
*raw_page
= PG_GETARG_BYTEA_P(0);
45 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE
),
46 errmsg("must be superuser to use raw page functions")));
48 page
= get_page_from_raw(raw_page
);
53 fsmpage
= (FSMPage
) PageGetContents(page
);
55 initStringInfo(&sinfo
);
57 for (i
= 0; i
< NodesPerPage
; i
++)
59 if (fsmpage
->fp_nodes
[i
] != 0)
60 appendStringInfo(&sinfo
, "%d: %d\n", i
, fsmpage
->fp_nodes
[i
]);
62 appendStringInfo(&sinfo
, "fp_next_slot: %d\n", fsmpage
->fp_next_slot
);
64 PG_RETURN_TEXT_P(cstring_to_text_with_len(sinfo
.data
, sinfo
.len
));