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ncheck.c

/*
 * ncheck.c --- given a list of inodes, generate a list of names
 * 
 * Copyright (C) 1994 Theodore Ts'o.  This file may be redistributed
 * under the terms of the GNU Public License.
 */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "debugfs.h"

struct inode_info {
      ino_t ino;
      ino_t parent;
      char  *pathname;
};

struct inode_walk_struct {
      struct inode_info *iarray;
      int               inodes_left;
      int               num_inodes;
      int               position;
      ino_t             parent;
};

int ncheck_proc(struct ext2_dir_entry *dirent,
            int   offset,
            int   blocksize,
            char  *buf,
            void  *private)
{
      struct inode_walk_struct *iw = (struct inode_walk_struct *) private;
      int   i;

      iw->position++;
      if (iw->position <= 2)
            return 0;
      for (i=0; i < iw->num_inodes; i++) {
            if (iw->iarray[i].ino == dirent->inode) {
                  iw->iarray[i].parent = iw->parent;
                  iw->inodes_left--;
            }
      }
      if (!iw->inodes_left)
            return DIRENT_ABORT;
      
      return 0;
}

void do_ncheck(int argc, char **argv)
{
      struct inode_walk_struct iw;
      struct inode_info *iinfo;
      int               i;
      ext2_inode_scan         scan = 0;
      ino_t             ino;
      struct ext2_inode inode;
      errcode_t         retval;
      char              *tmp;
      
      if (argc < 2) {
            com_err(argv[0], 0, "Usage: ncheck <inode number> ...");
            return;
      }
      if (check_fs_open(argv[0]))
            return;

      iw.iarray = malloc(sizeof(struct inode_info) * argc);
      if (!iw.iarray) {
            com_err("do_ncheck", ENOMEM,
                  "while allocating inode info array");
            return;
      }
      memset(iw.iarray, 0, sizeof(struct inode_info) * argc);

      for (i=1; i < argc; i++) {
            iw.iarray[i-1].ino = strtol(argv[i], &tmp, 0);
            if (*tmp) {
                  com_err(argv[0], 0, "Bad inode - %s", argv[i]);
                  return;
            }
      }

      iw.num_inodes = iw.inodes_left = argc-1;

      retval = ext2fs_open_inode_scan(fs, 0, &scan);
      if (retval) {
            com_err("ncheck", retval, "while opening inode scan");
            goto error_out;
      }

      retval = ext2fs_get_next_inode(scan, &ino, &inode);
      if (retval) {
            com_err("ncheck", retval, "while starting inode scan");
            goto error_out;
      }
      
      while (ino) {
            if (!inode.i_links_count)
                  goto next;
            /*
             * To handle filesystems touched by 0.3c extfs; can be
             * removed later.
             */
            if (inode.i_dtime)
                  goto next;
            /* Ignore anything that isn't a directory */
            if (!S_ISDIR(inode.i_mode))
                  goto next;

            iw.position = 0;
            iw.parent = ino;
            
            retval = ext2fs_dir_iterate(fs, ino, 0, 0,
                                  ncheck_proc, &iw);
            if (retval) {
                  com_err("ncheck", retval,
                        "while calling ext2_dir_iterate");
                  goto next;
            }

            if (iw.inodes_left == 0)
                  break;

      next:
            retval = ext2fs_get_next_inode(scan, &ino, &inode);
            if (retval) {
                  com_err("ncheck", retval,
                        "while doing inode scan");
                  goto error_out;
            }
      }

      for (i=0, iinfo = iw.iarray; i < iw.num_inodes; i++, iinfo++) {
            if (iinfo->parent == 0)
                  continue;
            retval = ext2fs_get_pathname(fs, iinfo->parent,
                                   iinfo->ino, &iinfo->pathname);
            if (retval)
                  com_err("ncheck", retval,
                        "while resolving pathname for inode %d (%d)",
                        iinfo->parent, iinfo->ino);
      }
      
      printf("Inode\tPathname\n");
      for (i=0, iinfo = iw.iarray; i < iw.num_inodes; i++, iinfo++) {
            if (iinfo->parent == 0) {
                  printf("%ld\t<inode not found>\n", iinfo->ino);
                  continue;
            }
            printf("%ld\t%s\n", iinfo->ino, iinfo->pathname ?
                   iinfo->pathname : "<unknown pathname>");
            if (iinfo->pathname)
                  free(iinfo->pathname);
      }

error_out:
      free(iw.iarray);
      if (scan)
            ext2fs_close_inode_scan(scan);
      return;
}




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