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Full Discussion: Cannot find logical file format for BSD file headers.
Top Forums UNIX for Advanced & Expert Users Cannot find logical file format for BSD file headers. Post 302957133 by jim mcnamara on Wednesday 7th of October 2015 10:52:50 AM
Old 10-07-2015
I'l give this a try but I do not quite get the point, so I may be way off:

One of your assumptions needs a tuneup. How inodes (one the objects you want to learn about) are stored is implementation dependent, so ffs filesystems may have a different structure from ufs filesystems.

There is no one single fits-everything kind of answer.

What you have to do is to get the source code for the filesystem(s) you want, then look in the .h files for structures. Look for inode, and vnode. This stuff will be in driver source for a particular filesystem flavor.

You can get a lot of this information and write simple C programs using
Code:
dirent.h

which is a wrapper to calls that show directory entries, one of the places you need to look. Structures on the disk are a whole lot tougher to navigate through. And directories have file structure on top of the file metadata.

Now my turn:
Why are you going this way? Please tell us what you want to accomplish. Not how you think you can do it.

Answers like
' I need to see the actual list of segments for a file and their absolute offsets'
are what we need.
This User Gave Thanks to jim mcnamara For This Post:
Chris_top_he_r
 

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LEARN ABOUT NETBSD

quotaon

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

NAME

     quotaon, quotaoff -- turn filesystem quotas on and off

SYNOPSIS

     quotaon [-g] [-u] [-v] filesystem ...
     quotaon [-g] [-u] [-v] -a
     quotaoff [-g] [-u] [-v] filesystem ...
     quotaoff [-g] [-u] [-v] -a

DESCRIPTION

     quotaon announces to the system that disk quotas should be enabled on one or more filesystems.  quotaoff announces to the system that the
     specified filesystems should have any disk quotas turned off.  The filesystems specified must have entries in /etc/fstab and be mounted.
     quotaon expects each filesystem to have quota files named quota.user and quota.group which are located at the root of the associated file
     system.  These defaults may be overridden in /etc/fstab.  By default both user and group quotas are enabled.

     Available options:

     -a      If the -a flag is supplied in place of any filesystem names, quotaon/quotaoff will enable/disable all the filesystems indicated in
	     /etc/fstab to be read-write with disk quotas.  By default only the types of quotas listed in /etc/fstab are enabled.

     -g      Only group quotas listed in /etc/fstab should be enabled/disabled.

     -u      Only user quotas listed in /etc/fstab should be enabled/disabled.

     -v      Causes quotaon and quotaoff to print a message for each filesystem where quotas are turned on or off.

     Specifying both -g and -u is equivalent to the default.

FILES

     quota.user   at the filesystem root with user quotas
     quota.group  at the filesystem root with group quotas
     /etc/fstab   filesystem table

SEE ALSO

     quota(1), libquota(3), fstab(5), edquota(8), quotacheck(8), repquota(8)

HISTORY

     The quotaon command appeared in 4.2BSD.

BSD
								 December 11, 1993							       BSD
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