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icheck                       Command                       icheck




i-node consistency check


iicchheecckk [-ss] [-bb _N ...] [ -vv ] _f_i_l_e_s_y_s_t_e_m ...

Each block  in a file  system must be  either free (i.e.,  in the
free  list) or  allocated (i.e., associated  with exactly  one i-
node).  icheck examines each specified filesystem, printing block
numbers that  are claimed by more than one  i-node, or claimed by
both an i-node and the free list.  It also checks for blocks that
appear more  than once in the  block list of an  i-node or in the
free list.

The option -v (verbose) causes icheck to print a summary of block
usage in  the filesystem.  The option -s  causes icheck to ignore
the free  list, to note which blocks are  claimed by i-nodes, and
to rebuild  the free  list with the  remainder.  A list  of block
numbers may be submitted with the -b flag; icheck prints the data
structure  associated  with  each block  as  the  file system  is
scanned.

The raw  device should be used, and the  filesystem should be un-
mounted if possible.  If this  is not possible (e.g., on the root
file  system) and  the  -s option  is  used, the  system must  be
rebooted immediately to expunge the obsolete superblock.

The exit status bits for a bad return are as follows:


     00xx0011 Miscellaneous error (e.g. out of space)
     00xx0022 Too hard to fix without human intervention
     00xx0044 Bad free block
     00xx0088 Missing blocks
     00xx1100 Duplicates in free list
     00xx2200 Bad block in free list


***** See Also *****

clri, commands, dcheck, fsck, ncheck, sync, umount

***** Diagnostics *****

The message  ``dups in  free'' indicates a  block is in  the free
list more than  once.  ``bad freelist'' indicates the presence of
bad blocks  on the free list.   A ``bad'' block is  one that lies
outside the  bounds of the  file system.  A  ``dup'' (duplicated)
block is one associated with the free list and an i-node, or with
more than  one i-node.   All the  errors above must  be corrected
before the file system is mounted.  ``bad ifree'' means allocated
i-nodes are on the free i-node list; this is inconsequential.

This command has largely been replaced by fsck.



COHERENT Lexicon                                           Page 1

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