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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 OPENSOLARIS

stmfaddviewentry

stmfAddViewEntry(3STMF) 			   SCSI Target Mode Framework Library Functions 			   stmfAddViewEntry(3STMF)

NAME

       stmfAddViewEntry - add a view entry for a given logical unit

SYNOPSIS

       cc [ flag... ] file... -lstmf [ library... ]
       #include <libstmf.h>

       int stmfAddViewEntry(stmfGuid *logicalUnit,
	    stmfViewEntry *viewEntry);

PARAMETERS

       logicalUnit    The identifier of the logical unit to which this view entry is being added.

       viewEntry      The view entry to add to the specified logical unit identifier.

DESCRIPTION

       The stmfAddViewEntry() function adds a view entry for a given logical unit.

RETURN VALUES

       The following values are returned:

       STMF_ERROR_LUN_IN_USE	 The specified logical unit number is already in use for this logical unit.

       STMF_ERROR_NOT_FOUND	 The ID specified for logicalUnit was not found in the system.

       STMF_ERROR_VE_CONFLICT	 Adding this view entry is in conflict with one or more existing view entries.

       STMF_STATUS_SUCCESS	 The API call was successful.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       libstmf(3LIB), attributes(5)

NOTES

       If  luNbrValid in the stmfViewEntry structure is set to B_FALSE, the framework will assign a logical unit number for this view entry. veIn-
       dexValid must be set to B_FALSE when adding a view entry. On successful return, veIndexValid will be set to B_TRUE and veIndex will contain
       the view entry index assigned to this view entry by the framework.

SunOS 5.11							    9 Jun 2008						   stmfAddViewEntry(3STMF)
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