[Bug 861281] Re: FSCK on fs with claimed blocks yields Programming Error in process_bad_block

[Theodore Ts'o]

On Mon, Oct 03, 2011 at 02:15:37PM -0000, Endre Karlson wrote:
> What does the first inode do?

Inode #1 is the "bad block inode".  It's an indirect-block mapped
(never extent mapped) inode that is used to reserve blocks which
shouldn't be used because they have hardware errors.  In modern-day
devices this is done by the HDD/SDD automatically, so its use in
ext2/3/4 file systems is largely vestigal.

Other low numbered inodes:

#define	EXT4_BAD_INO		 1	/* Bad blocks inode */
#define EXT4_ROOT_INO		 2	/* Root inode */
#define EXT4_USR_QUOTA_INO	 3	/* User quota inode */
#define EXT4_GRP_QUOTA_INO	 4	/* Group quota inode */
#define EXT4_BOOT_LOADER_INO	 5	/* Boot loader inode */
#define EXT4_UNDEL_DIR_INO	 6	/* Undelete directory inode */
#define EXT4_RESIZE_INO		 7	/* Reserved group descriptors inode */
#define EXT4_JOURNAL_INO	 8	/* Journal inode */

Inodes 3,4 is only used in some experimental code that hasn't been
fully integrated into ext4 yet.  (The current quota system uses
user-visible files that be corrupted by careless system
administrators; inodes 3 and 4 are hidden inodes.)  Inodes 5 and 6
aren't actually used at the moment, but they are reserved for future
use.

                                                - Ted

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https://bugs.launchpad.net/bugs/861281

Title:
  FSCK on fs with claimed blocks yields Programming Error in
  process_bad_block

Status in “e2fsprogs” package in Ubuntu:
  New

Bug description:
  Pass 1: Checking inodes, blocks, and sizes
  Programming error?  block #2013802232 claimed for no reason in process_bad_block.
  Programming error?  block #1648606690 claimed for no reason in process_bad_block.
  Programming error?  block #3170630438 claimed for no reason in process_bad_block.
  Programming error?  block #2013802232 claimed for no reason in process_bad_block.
  Programming error?  block #1648606690 claimed for no reason in process_bad_block.
  Programming error?  block #3170630438 claimed for no reason in process_bad_block.
  Programming error?  block #2013802232 claimed for no reason in process_bad_block.
  Programming error?  block #1648606690 claimed for no reason in process_bad_block.
  Programming error?  block #3170630438 claimed for no reason in process_bad_block.
  Programming error?  block #2013802232 claimed for no reason in process_bad_block.
  Programming error?  block #1648606690 claimed for no reason in process_bad_block.
  Programming error?  block #3170630438 claimed for no reason in process_bad_block.
  Programming error?  block #2013802232 claimed for no reason in process_bad_block.
  Programming error?  block #1648606690 claimed for no reason in process_bad_block.
  Programming error?  block #3170630438 claimed for no reason in process_bad_block.
  Programming error?  block #2013802232 claimed for no reason in process_bad_block.
  Programming error?  block #1648606690 claimed for no reason in process_bad_block.
  Programming error?  block #3170630438 claimed for no reason in process_bad_block.
  Programming error?  block #2013802232 claimed for no reason in process_bad_block.

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