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find_inode_paths.c

/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * find_inode_paths.c
 *
 * Simple tool to take an inode block number and find all paths
 * leading to it.
 *
 * Copyright (C) 2004 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License, version 2,  as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 *
 * Authors: Mark Fasheh, Joel Becker
 *
 *  This code is a port of e2fsprogs/lib/ext2fs/dir_iterate.c
 *  Copyright (C) 1993, 1994, 1994, 1995, 1996, 1997 Theodore Ts'o.
 */

#define _XOPEN_SOURCE 600 /* Triggers magic in features.h */
#define _LARGEFILE64_SOURCE

#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <inttypes.h>

#include "ocfs2.h"

static void print_usage(void)
{
      fprintf(stderr,
            "Usage: find_inode_paths <filename> <inode #>\n");
}

struct walk_path {
      char *argv0;
      ocfs2_filesys *fs;
      char *path;
      int quiet;
      uint64_t inode;
};

static int walk_tree_func(struct ocfs2_dir_entry *dentry,
                    int offset,
                    int blocksize,
                    char *buf,
                    void *priv_data)
{
      errcode_t ret;
      int len, oldval;
      int reti = 0;
      char *old_path, *path;
      struct walk_path *wp = priv_data;

      if (!strncmp(dentry->name, ".", dentry->name_len) ||
          !strncmp(dentry->name, "..", dentry->name_len))
            return 0;

      len = strlen(wp->path);

      if (len + dentry->name_len > 4095) {
            fprintf(stderr, "name is too long in %s\n", wp->path);
            return OCFS2_DIRENT_ABORT;
      }

      ret = ocfs2_malloc0(4096, &path);
      if (ret) {
            com_err(wp->argv0, ret,
                  "while allocating path memory in %s\n",
                  wp->path);
            return OCFS2_DIRENT_ABORT;
      }
      
      memcpy(path, wp->path, len);
      memcpy(path + len, dentry->name, dentry->name_len);
      if (dentry->file_type == OCFS2_FT_DIR)
            path[len + dentry->name_len] = '/';

      oldval = 0;

      if (!wp->quiet)
            fprintf(stdout, "[trace] %13"PRIu64" %s\n", dentry->inode, 
                        path);

      if (dentry->inode == wp->inode)
            fprintf(stdout, "[found] %13"PRIu64" %s\n", dentry->inode, 
                        path);

      if (dentry->file_type == OCFS2_FT_DIR) {
            old_path = wp->path;
            wp->path = path;
            ret = ocfs2_dir_iterate(wp->fs, dentry->inode, 0, NULL,
                              walk_tree_func, wp);
            if (ret) {
                  com_err(wp->argv0, ret,
                        "while walking %s", wp->path);
                  reti = OCFS2_DIRENT_ABORT;
            }
            wp->path = old_path;
      }

      ocfs2_free(&path);

      return reti;
}

static uint64_t read_number(const char *num)
{
      uint64_t val;
      char *ptr;

      val = strtoull(num, &ptr, 0);
      if (!ptr || *ptr)
            return 0;

      return val;
}

extern int opterr, optind;
extern char *optarg;

int main(int argc, char *argv[])
{
      errcode_t ret;
      uint64_t blkno;
      char *filename;
      ocfs2_filesys *fs;
      struct walk_path wp;

      blkno = OCFS2_SUPER_BLOCK_BLKNO;

      initialize_ocfs_error_table();

      wp.argv0 = argv[0];
      wp.quiet = 1;
      if (argc < 3) {
            fprintf(stderr, "Missing filename\n");
            print_usage();
            return 1;
      }
      filename = argv[1];

      wp.inode = read_number(argv[2]);
      if (!wp.inode) {
            fprintf(stderr, "invalid inode number\n");
            print_usage();
            return 1;
      }

      ret = ocfs2_open(filename, OCFS2_FLAG_RO, 0, 0, &fs);
      if (ret) {
            com_err(argv[0], ret,
                  "while opening file \"%s\"", filename);
            goto out;
      }
      wp.fs = fs;
      fprintf(stdout, "Finding all paths leading to inode %"PRIu64"\n", 
            wp.inode);

      if (!wp.quiet)
            fprintf(stdout, "Walking system directory...\n");
      wp.path = "<system_dir>/";
      ret = ocfs2_dir_iterate(fs,
                        OCFS2_RAW_SB(fs->fs_super)->s_system_dir_blkno,
                        0, NULL, walk_tree_func, &wp);
      if (ret) {
            com_err(argv[0], ret,
                  "while walking sysdm dir inode %"PRIu64" on \"%s\"\n",
                  blkno, filename);
            goto out_close;
      }
      wp.path = "/";

      if (!wp.quiet)
            fprintf(stdout, "Walking root directory...\n");
      ret = ocfs2_dir_iterate(fs,
                        OCFS2_RAW_SB(fs->fs_super)->s_root_blkno,
                        0, NULL, walk_tree_func, &wp);
      if (ret) {
            com_err(argv[0], ret,
                  "while walking root inode %"PRIu64" on \"%s\"\n",
                  blkno, filename);
            goto out_close;
      }

out_close:
      ret = ocfs2_close(fs);
      if (ret) {
            com_err(argv[0], ret,
                  "while closing file \"%s\"", filename);
      }

out:
      return 0;
}


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