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NetBSD 6.1.5 - man page for fsck_ext2fs (netbsd section 8)

FSCK_EXT2FS(8)			   BSD System Manager's Manual			   FSCK_EXT2FS(8)

NAME
     fsck_ext2fs -- ext2 File System consistency check and interactive repair

SYNOPSIS
     fsck_ext2fs [-dfnpUy] [-b block#] [-c level] [-m mode] filesystem ...

DESCRIPTION
     fsck_ext2fs performs interactive filesystem consistency checks and repair for each of the
     filesystems specified on the command line.  It is normally invoked from fsck(8).

     The kernel takes care that only a restricted class of innocuous filesystem inconsistencies
     can happen unless hardware or software failures intervene.  These are limited to the follow-
     ing:

     Unreferenced inodes
     Link counts in inodes too large
     Missing blocks in the free map
     Blocks in the free map also in files
     Counts in the super-block wrong

     These are the only inconsistencies that fsck_ext2fs in ``preen'' mode (with the -p option)
     will correct; if it encounters other inconsistencies, it exits with an abnormal return sta-
     tus.  For each corrected inconsistency one or more lines will be printed identifying the
     filesystem on which the correction will take place, and the nature of the correction.  After
     successfully correcting a filesystem, fsck_ext2fs will print the number of files on that
     filesystem and the number of used and free blocks.

     If sent a QUIT signal, fsck_ext2fs will finish the filesystem checks, then exit with an
     abnormal return status.

     Without the -p option, fsck_ext2fs audits and interactively repairs inconsistent conditions
     for filesystems.  If the filesystem is inconsistent the operator is prompted for concurrence
     before each correction is attempted.  It should be noted that some of the corrective actions
     which are not correctable under the -p option will result in some loss of data.  The amount
     and severity of data lost may be determined from the diagnostic output.  The default action
     for each consistency correction is to wait for the operator to respond yes or no.	If the
     operator does not have write permission on the filesystem fsck_ext2fs will default to a -n
     action.

     The following flags are interpreted by fsck_ext2fs.

     -b      Use the block specified immediately after the flag as the super block for the
	     filesystem.  Block 8193 is usually an alternate super block.

     -d      Print debugging output.

     -f      Force checking of file systems.  Normally, if a file system is cleanly unmounted,
	     the kernel will set a ``clean flag'' in the file system superblock, and fsck_ext2fs
	     will not check the file system.  This option forces fsck_ext2fs to check the file
	     system, regardless of the state of the clean flag.

     -m      Use the mode specified in octal immediately after the flag as the permission bits to
	     use when creating the lost+found directory rather than the default 1777.  In partic-
	     ular, systems that do not wish to have lost files accessible by all users on the
	     system should use a more restrictive set of permissions such as 700.

     -n      Assume a no response to all questions asked by fsck_ext2fs except for 'CONTINUE?',
	     which is assumed to be affirmative; do not open the filesystem for writing.

     -p      Specify ``preen'' mode, described above.

     -U      Resolve numeric userids to usernames.

     -y      Assume a yes response to all questions asked by fsck_ext2fs; this should be used
	     with great caution as this is a free license to continue after essentially unlimited
	     trouble has been encountered.

     Inconsistencies checked are as follows:
	   1.	Blocks claimed by more than one inode or the free map.
	   2.	Blocks claimed by an inode outside the range of the filesystem.
	   3.	Incorrect link counts.
	   4.	Size checks:
		      Directory size not a multiple of filesystem block size.
		      Partially truncated file.
	   5.	Bad inode format.
	   6.	Blocks not accounted for anywhere.
	   7.	Directory checks:
		      File pointing to unallocated inode.
		      Inode number out of range.
		      Dot or dot-dot not the first two entries of a directory or having the wrong
		      inode number.
	   8.	Super Block checks:
		      More blocks for inodes than there are in the filesystem.
		      Bad free block map format.
		      Total free block and/or free inode count incorrect.

     Orphaned files and directories (allocated but unreferenced) are, with the operator's concur-
     rence, reconnected by placing them in the lost+found directory.  The name assigned is the
     inode number.  If the lost+found directory does not exist, it is created.	If there is
     insufficient space its size is increased.

     Because of inconsistencies between the block device and the buffer cache, the raw device
     should always be used.

DIAGNOSTICS
     The diagnostics produced by fsck_ext2fs are fully enumerated and explained in Appendix A of
     Fsck - The UNIX File System Check Program.

SEE ALSO
     fs(5), fstab(5), fsck(8), fsdb(8), newfs(8), reboot(8)

BSD					 October 9, 2008				      BSD


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