linux-ext4 - debugfs: list inode numbers?

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Message-ID: <86ippw1ulp.fsf_-_@gray.siamics.net>
Date:	Wed, 17 Aug 2011 12:21:22 +0700
From:	Ivan Shmakov <ivan@...y.siamics.net>
To:	linux-ext4@...r.kernel.org
Subject: debugfs: list inode numbers? 

>>>>> Lukas Czerner <lczerner@...hat.com> writes:
>>>>> On Mon, 15 Aug 2011, Ivan Shmakov wrote:
>>>>> Lukas Czerner <lczerner@...hat.com> writes:

[…]

 >>> and with a little bit of scripting around it you should be able dig
 >>> any information you desire from the file system so I do not think
 >>> that new application is needed.  But I might be wrong, just take a
 >>> look at it.

 >> Indeed, my first try was to use debugfs(8).  However, there're
 >> several issues with it:

 >> • I see no way to obtain the list of used inodes in debugfs(8)
 >> (as of 1.41.12 debian 2); therefore, I have had to resort to
 >> trying the ‘stat’ command on every possible inode number;

 > I am not sure if there is a way to list used inodes in debugfs but it
 > should be very easy to implement.

	Something along the lines of the following, perhaps (assuming
	ISO C99):

   {
     int only_with_blocks_p
       = 0;
     ext2_inode_scan scan;

     {
       errcode_t r
         = ext2fs_open_inode_scan (e2, 0, &scan);
       assert (r == 0);
     }

     FILE *out
       = stdout;
     errcode_t r;
     ext2_ino_t ino;
     struct ext2_inode inode;
     int column;

     /* FIXME: handle EXT2_ET_BAD_BLOCK_IN_INODE_TABLE, too */
     while (((r = ext2fs_get_next_inode (scan, &ino, &inode)) == 0)
            && ino != 0) {
       if (! only_with_blocks_p
           || ext2fs_inode_has_valid_blocks (inode)) {
         /* skip over the inodes lacking valid blocks, if requested */
	 continue;
       }

       int n
         = fprintf (out, " <%d>");
       assert (n >= 0);
       column += n;
       /* NB: assuming that a typical inode number will be less than 9
              decimal digits long, and that the terminal has 80 columns
              */
       if (column >= 80 - 12) {
         fputc ('\n', out);
       }
     }
     /* FIXME: handle EXT2_ET_BAD_BLOCK_IN_INODE_TABLE, too */
     assert (r == 0);
   }

	Or should I develop a proper patch?

[…]

-- 
FSF associate member #7257

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