407 lines
8.6 KiB
C
407 lines
8.6 KiB
C
/*
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* dbsize.c
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* object size functions
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*
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* Copyright (c) 2002-2009, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/dbsize.c,v 1.23 2009/01/01 17:23:49 momjian Exp $
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*
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*/
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#include "postgres.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "access/heapam.h"
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#include "catalog/catalog.h"
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#include "catalog/namespace.h"
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#include "catalog/pg_tablespace.h"
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#include "commands/dbcommands.h"
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#include "commands/tablespace.h"
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#include "miscadmin.h"
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#include "storage/fd.h"
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#include "utils/acl.h"
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#include "utils/builtins.h"
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#include "utils/rel.h"
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#include "utils/syscache.h"
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/* Return physical size of directory contents, or 0 if dir doesn't exist */
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static int64
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db_dir_size(const char *path)
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{
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int64 dirsize = 0;
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struct dirent *direntry;
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DIR *dirdesc;
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char filename[MAXPGPATH];
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dirdesc = AllocateDir(path);
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if (!dirdesc)
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return 0;
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while ((direntry = ReadDir(dirdesc, path)) != NULL)
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{
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struct stat fst;
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if (strcmp(direntry->d_name, ".") == 0 ||
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strcmp(direntry->d_name, "..") == 0)
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continue;
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snprintf(filename, MAXPGPATH, "%s/%s", path, direntry->d_name);
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if (stat(filename, &fst) < 0)
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{
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if (errno == ENOENT)
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continue;
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else
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not stat file \"%s\": %m", filename)));
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}
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dirsize += fst.st_size;
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}
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FreeDir(dirdesc);
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return dirsize;
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}
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/*
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* calculate size of database in all tablespaces
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*/
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static int64
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calculate_database_size(Oid dbOid)
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{
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int64 totalsize;
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DIR *dirdesc;
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struct dirent *direntry;
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char dirpath[MAXPGPATH];
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char pathname[MAXPGPATH];
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AclResult aclresult;
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/* User must have connect privilege for target database */
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aclresult = pg_database_aclcheck(dbOid, GetUserId(), ACL_CONNECT);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_DATABASE,
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get_database_name(dbOid));
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/* Shared storage in pg_global is not counted */
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/* Include pg_default storage */
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snprintf(pathname, MAXPGPATH, "base/%u", dbOid);
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totalsize = db_dir_size(pathname);
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/* Scan the non-default tablespaces */
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snprintf(dirpath, MAXPGPATH, "pg_tblspc");
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dirdesc = AllocateDir(dirpath);
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if (!dirdesc)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not open tablespace directory \"%s\": %m",
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dirpath)));
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while ((direntry = ReadDir(dirdesc, dirpath)) != NULL)
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{
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if (strcmp(direntry->d_name, ".") == 0 ||
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strcmp(direntry->d_name, "..") == 0)
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continue;
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snprintf(pathname, MAXPGPATH, "pg_tblspc/%s/%u",
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direntry->d_name, dbOid);
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totalsize += db_dir_size(pathname);
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}
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FreeDir(dirdesc);
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/* Complain if we found no trace of the DB at all */
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if (!totalsize)
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ereport(ERROR,
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(ERRCODE_UNDEFINED_DATABASE,
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errmsg("database with OID %u does not exist", dbOid)));
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return totalsize;
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}
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Datum
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pg_database_size_oid(PG_FUNCTION_ARGS)
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{
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Oid dbOid = PG_GETARG_OID(0);
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PG_RETURN_INT64(calculate_database_size(dbOid));
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}
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Datum
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pg_database_size_name(PG_FUNCTION_ARGS)
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{
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Name dbName = PG_GETARG_NAME(0);
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Oid dbOid = get_database_oid(NameStr(*dbName));
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if (!OidIsValid(dbOid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_DATABASE),
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errmsg("database \"%s\" does not exist",
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NameStr(*dbName))));
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PG_RETURN_INT64(calculate_database_size(dbOid));
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}
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/*
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* calculate total size of tablespace
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*/
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static int64
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calculate_tablespace_size(Oid tblspcOid)
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{
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char tblspcPath[MAXPGPATH];
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char pathname[MAXPGPATH];
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int64 totalsize = 0;
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DIR *dirdesc;
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struct dirent *direntry;
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AclResult aclresult;
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/*
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* User must have CREATE privilege for target tablespace, either
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* explicitly granted or implicitly because it is default for current
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* database.
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*/
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if (tblspcOid != MyDatabaseTableSpace)
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{
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aclresult = pg_tablespace_aclcheck(tblspcOid, GetUserId(), ACL_CREATE);
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if (aclresult != ACLCHECK_OK)
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aclcheck_error(aclresult, ACL_KIND_TABLESPACE,
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get_tablespace_name(tblspcOid));
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}
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if (tblspcOid == DEFAULTTABLESPACE_OID)
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snprintf(tblspcPath, MAXPGPATH, "base");
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else if (tblspcOid == GLOBALTABLESPACE_OID)
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snprintf(tblspcPath, MAXPGPATH, "global");
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else
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snprintf(tblspcPath, MAXPGPATH, "pg_tblspc/%u", tblspcOid);
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dirdesc = AllocateDir(tblspcPath);
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if (!dirdesc)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not open tablespace directory \"%s\": %m",
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tblspcPath)));
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while ((direntry = ReadDir(dirdesc, tblspcPath)) != NULL)
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{
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struct stat fst;
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if (strcmp(direntry->d_name, ".") == 0 ||
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strcmp(direntry->d_name, "..") == 0)
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continue;
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snprintf(pathname, MAXPGPATH, "%s/%s", tblspcPath, direntry->d_name);
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if (stat(pathname, &fst) < 0)
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{
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if (errno == ENOENT)
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continue;
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else
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not stat file \"%s\": %m", pathname)));
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}
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if (S_ISDIR(fst.st_mode))
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totalsize += db_dir_size(pathname);
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totalsize += fst.st_size;
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}
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FreeDir(dirdesc);
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return totalsize;
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}
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Datum
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pg_tablespace_size_oid(PG_FUNCTION_ARGS)
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{
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Oid tblspcOid = PG_GETARG_OID(0);
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PG_RETURN_INT64(calculate_tablespace_size(tblspcOid));
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}
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Datum
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pg_tablespace_size_name(PG_FUNCTION_ARGS)
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{
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Name tblspcName = PG_GETARG_NAME(0);
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Oid tblspcOid = get_tablespace_oid(NameStr(*tblspcName));
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if (!OidIsValid(tblspcOid))
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ereport(ERROR,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("tablespace \"%s\" does not exist",
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NameStr(*tblspcName))));
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PG_RETURN_INT64(calculate_tablespace_size(tblspcOid));
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}
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/*
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* calculate size of a relation
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*/
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static int64
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calculate_relation_size(RelFileNode *rfn, ForkNumber forknum)
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{
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int64 totalsize = 0;
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char *relationpath;
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char pathname[MAXPGPATH];
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unsigned int segcount = 0;
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relationpath = relpath(*rfn, forknum);
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for (segcount = 0;; segcount++)
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{
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struct stat fst;
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if (segcount == 0)
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snprintf(pathname, MAXPGPATH, "%s",
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relationpath);
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else
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snprintf(pathname, MAXPGPATH, "%s.%u",
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relationpath, segcount);
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if (stat(pathname, &fst) < 0)
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{
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if (errno == ENOENT)
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break;
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else
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not stat file \"%s\": %m", pathname)));
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}
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totalsize += fst.st_size;
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}
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return totalsize;
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}
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Datum
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pg_relation_size(PG_FUNCTION_ARGS)
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{
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Oid relOid = PG_GETARG_OID(0);
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text *forkName = PG_GETARG_TEXT_P(1);
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Relation rel;
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int64 size;
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rel = relation_open(relOid, AccessShareLock);
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size = calculate_relation_size(&(rel->rd_node),
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forkname_to_number(text_to_cstring(forkName)));
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relation_close(rel, AccessShareLock);
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PG_RETURN_INT64(size);
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}
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/*
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* Compute the on-disk size of files for the relation according to the
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* stat function, including heap data, index data, and toast data.
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*/
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static int64
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calculate_total_relation_size(Oid Relid)
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{
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Relation heapRel;
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Oid toastOid;
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int64 size;
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ListCell *cell;
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ForkNumber forkNum;
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heapRel = relation_open(Relid, AccessShareLock);
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toastOid = heapRel->rd_rel->reltoastrelid;
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/* Get the heap size */
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size = 0;
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for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
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size += calculate_relation_size(&(heapRel->rd_node), forkNum);
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/* Include any dependent indexes */
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if (heapRel->rd_rel->relhasindex)
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{
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List *index_oids = RelationGetIndexList(heapRel);
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foreach(cell, index_oids)
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{
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Oid idxOid = lfirst_oid(cell);
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Relation iRel;
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iRel = relation_open(idxOid, AccessShareLock);
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for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
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size += calculate_relation_size(&(iRel->rd_node), forkNum);
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relation_close(iRel, AccessShareLock);
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}
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list_free(index_oids);
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}
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/* Recursively include toast table (and index) size */
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if (OidIsValid(toastOid))
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size += calculate_total_relation_size(toastOid);
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relation_close(heapRel, AccessShareLock);
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return size;
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}
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Datum
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pg_total_relation_size(PG_FUNCTION_ARGS)
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{
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Oid relid = PG_GETARG_OID(0);
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PG_RETURN_INT64(calculate_total_relation_size(relid));
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}
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/*
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* formatting with size units
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*/
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Datum
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pg_size_pretty(PG_FUNCTION_ARGS)
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{
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int64 size = PG_GETARG_INT64(0);
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char buf[64];
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int64 limit = 10 * 1024;
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int64 mult = 1;
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if (size < limit * mult)
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snprintf(buf, sizeof(buf), INT64_FORMAT " bytes", size);
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else
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{
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mult *= 1024;
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if (size < limit * mult)
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snprintf(buf, sizeof(buf), INT64_FORMAT " kB",
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(size + mult / 2) / mult);
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else
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{
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mult *= 1024;
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if (size < limit * mult)
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snprintf(buf, sizeof(buf), INT64_FORMAT " MB",
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(size + mult / 2) / mult);
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else
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{
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mult *= 1024;
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if (size < limit * mult)
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snprintf(buf, sizeof(buf), INT64_FORMAT " GB",
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(size + mult / 2) / mult);
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else
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{
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mult *= 1024;
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snprintf(buf, sizeof(buf), INT64_FORMAT " TB",
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(size + mult / 2) / mult);
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}
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}
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}
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}
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PG_RETURN_TEXT_P(cstring_to_text(buf));
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}
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