nostrdb

mdb_stat.c (6401B)

---

 /* mdb_stat.c - memory-mapped database status tool */
 /*
  * Copyright 2011-2021 Howard Chu, Symas Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted only as authorized by the OpenLDAP
  * Public License.
  *
  * A copy of this license is available in the file LICENSE in the
  * top-level directory of the distribution or, alternatively, at
  * <http://www.OpenLDAP.org/license.html>.
  */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include "lmdb.h"
 
 #ifdef	_WIN32
 #define	Z	"I"
 #else
 #define	Z	"z"
 #endif
 
 static void prstat(MDB_stat *ms)
 {
 #if 0
 	printf("  Page size: %u\n", ms->ms_psize);
 #endif
 	printf("  Tree depth: %u\n", ms->ms_depth);
 	printf("  Branch pages: %"Z"u\n", ms->ms_branch_pages);
 	printf("  Leaf pages: %"Z"u\n", ms->ms_leaf_pages);
 	printf("  Overflow pages: %"Z"u\n", ms->ms_overflow_pages);
 	printf("  Entries: %"Z"u\n", ms->ms_entries);
 }
 
 static void usage(char *prog)
 {
 	fprintf(stderr, "usage: %s [-V] [-n] [-e] [-r[r]] [-f[f[f]]] [-a|-s subdb] dbpath\n", prog);
 	exit(EXIT_FAILURE);
 }
 
 int main(int argc, char *argv[])
 {
 	int i, rc;
 	MDB_env *env;
 	MDB_txn *txn;
 	MDB_dbi dbi;
 	MDB_stat mst;
 	MDB_envinfo mei;
 	char *prog = argv[0];
 	char *envname;
 	char *subname = NULL;
 	int alldbs = 0, envinfo = 0, envflags = 0, freinfo = 0, rdrinfo = 0;
 
 	if (argc < 2) {
 		usage(prog);
 	}
 
 	/* -a: print stat of main DB and all subDBs
 	 * -s: print stat of only the named subDB
 	 * -e: print env info
 	 * -f: print freelist info
 	 * -r: print reader info
 	 * -n: use NOSUBDIR flag on env_open
 	 * -V: print version and exit
 	 * (default) print stat of only the main DB
 	 */
 	while ((i = getopt(argc, argv, "Vaefnrs:")) != EOF) {
 		switch(i) {
 		case 'V':
 			printf("%s\n", MDB_VERSION_STRING);
 			exit(0);
 			break;
 		case 'a':
 			if (subname)
 				usage(prog);
 			alldbs++;
 			break;
 		case 'e':
 			envinfo++;
 			break;
 		case 'f':
 			freinfo++;
 			break;
 		case 'n':
 			envflags |= MDB_NOSUBDIR;
 			break;
 		case 'r':
 			rdrinfo++;
 			break;
 		case 's':
 			if (alldbs)
 				usage(prog);
 			subname = optarg;
 			break;
 		default:
 			usage(prog);
 		}
 	}
 
 	if (optind != argc - 1)
 		usage(prog);
 
 	envname = argv[optind];
 	rc = mdb_env_create(&env);
 	if (rc) {
 		fprintf(stderr, "mdb_env_create failed, error %d %s\n", rc, mdb_strerror(rc));
 		return EXIT_FAILURE;
 	}
 
 	if (alldbs || subname) {
 		mdb_env_set_maxdbs(env, 4);
 	}
 
 	rc = mdb_env_open(env, envname, envflags | MDB_RDONLY, 0664);
 	if (rc) {
 		fprintf(stderr, "mdb_env_open failed, error %d %s\n", rc, mdb_strerror(rc));
 		goto env_close;
 	}
 
 	if (envinfo) {
 		(void)mdb_env_stat(env, &mst);
 		(void)mdb_env_info(env, &mei);
 		printf("Environment Info\n");
 		printf("  Map address: %p\n", mei.me_mapaddr);
 		printf("  Map size: %"Z"u\n", mei.me_mapsize);
 		printf("  Page size: %u\n", mst.ms_psize);
 		printf("  Max pages: %"Z"u\n", mei.me_mapsize / mst.ms_psize);
 		printf("  Number of pages used: %"Z"u\n", mei.me_last_pgno+1);
 		printf("  Last transaction ID: %"Z"u\n", mei.me_last_txnid);
 		printf("  Max readers: %u\n", mei.me_maxreaders);
 		printf("  Number of readers used: %u\n", mei.me_numreaders);
 	}
 
 	if (rdrinfo) {
 		printf("Reader Table Status\n");
 		rc = mdb_reader_list(env, (MDB_msg_func *)fputs, stdout);
 		if (rdrinfo > 1) {
 			int dead;
 			mdb_reader_check(env, &dead);
 			printf("  %d stale readers cleared.\n", dead);
 			rc = mdb_reader_list(env, (MDB_msg_func *)fputs, stdout);
 		}
 		if (!(subname || alldbs || freinfo))
 			goto env_close;
 	}
 
 	rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
 	if (rc) {
 		fprintf(stderr, "mdb_txn_begin failed, error %d %s\n", rc, mdb_strerror(rc));
 		goto env_close;
 	}
 
 	if (freinfo) {
 		MDB_cursor *cursor;
 		MDB_val key, data;
 		size_t pages = 0, *iptr;
 
 		printf("Freelist Status\n");
 		dbi = 0;
 		rc = mdb_cursor_open(txn, dbi, &cursor);
 		if (rc) {
 			fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
 			goto txn_abort;
 		}
 		rc = mdb_stat(txn, dbi, &mst);
 		if (rc) {
 			fprintf(stderr, "mdb_stat failed, error %d %s\n", rc, mdb_strerror(rc));
 			goto txn_abort;
 		}
 		prstat(&mst);
 		while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
 			iptr = data.mv_data;
 			pages += *iptr;
 			if (freinfo > 1) {
 				char *bad = "";
 				size_t pg, prev;
 				ssize_t i, j, span = 0;
 				j = *iptr++;
 				for (i = j, prev = 1; --i >= 0; ) {
 					pg = iptr[i];
 					if (pg <= prev)
 						bad = " [bad sequence]";
 					prev = pg;
 					pg += span;
 					for (; i >= span && iptr[i-span] == pg; span++, pg++) ;
 				}
 				printf("    Transaction %"Z"u, %"Z"d pages, maxspan %"Z"d%s\n",
 					*(size_t *)key.mv_data, j, span, bad);
 				if (freinfo > 2) {
 					for (--j; j >= 0; ) {
 						pg = iptr[j];
 						for (span=1; --j >= 0 && iptr[j] == pg+span; span++) ;
 						printf(span>1 ? "     %9"Z"u[%"Z"d]\n" : "     %9"Z"u\n",
 							pg, span);
 					}
 				}
 			}
 		}
 		mdb_cursor_close(cursor);
 		printf("  Free pages: %"Z"u\n", pages);
 	}
 
 	rc = mdb_open(txn, subname, 0, &dbi);
 	if (rc) {
 		fprintf(stderr, "mdb_open failed, error %d %s\n", rc, mdb_strerror(rc));
 		goto txn_abort;
 	}
 
 	rc = mdb_stat(txn, dbi, &mst);
 	if (rc) {
 		fprintf(stderr, "mdb_stat failed, error %d %s\n", rc, mdb_strerror(rc));
 		goto txn_abort;
 	}
 	printf("Status of %s\n", subname ? subname : "Main DB");
 	prstat(&mst);
 
 	if (alldbs) {
 		MDB_cursor *cursor;
 		MDB_val key;
 
 		rc = mdb_cursor_open(txn, dbi, &cursor);
 		if (rc) {
 			fprintf(stderr, "mdb_cursor_open failed, error %d %s\n", rc, mdb_strerror(rc));
 			goto txn_abort;
 		}
 		while ((rc = mdb_cursor_get(cursor, &key, NULL, MDB_NEXT_NODUP)) == 0) {
 			char *str;
 			MDB_dbi db2;
 			if (memchr(key.mv_data, '\0', key.mv_size))
 				continue;
 			str = malloc(key.mv_size+1);
 			memcpy(str, key.mv_data, key.mv_size);
 			str[key.mv_size] = '\0';
 			rc = mdb_open(txn, str, 0, &db2);
 			if (rc == MDB_SUCCESS)
 				printf("Status of %s\n", str);
 			free(str);
 			if (rc) continue;
 			rc = mdb_stat(txn, db2, &mst);
 			if (rc) {
 				fprintf(stderr, "mdb_stat failed, error %d %s\n", rc, mdb_strerror(rc));
 				goto txn_abort;
 			}
 			prstat(&mst);
 			mdb_close(env, db2);
 		}
 		mdb_cursor_close(cursor);
 	}
 
 	if (rc == MDB_NOTFOUND)
 		rc = MDB_SUCCESS;
 
 	mdb_close(env, dbi);
 txn_abort:
 	mdb_txn_abort(txn);
 env_close:
 	mdb_env_close(env);
 
 	return rc ? EXIT_FAILURE : EXIT_SUCCESS;
 }