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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 MOJAVE

xfs_ncheck

xfs_ncheck(8)                                                 System Manager's Manual                                                xfs_ncheck(8)

NAME

       xfs_ncheck - generate pathnames from i-numbers for XFS

SYNOPSIS

       xfs_ncheck [ -i ino ] ... [ -f ] [ -s ] [ -l logdev ] device

DESCRIPTION

       xfs_ncheck  with no -i arguments generates an inode number and pathname list of all files on the given filesystem. Names of directory files
       are followed by /..  The output is not sorted in any particular order.  The filesystem to be examined is specified by the device  argument,
       which should be the disk or volume device for the filesystem.  Filesystems stored in files can also be checked, using the -f flag.

OPTIONS

       -f       Specifies  that the filesystem image to be processed is stored in a regular file at device (see the mkfs.xfs -d file option). This
                might happen if an image copy of a filesystem has been made into an ordinary file.

       -l logdev
                Specifies the device where the filesystem's external log resides.  Only for those filesystems which use an external log.  See  the
                mkfs.xfs -l option, and refer to xfs(5) for a detailed description of the XFS log.

       -s       Limits  the  report to special files and files with setuserid mode.  This option may be used to detect violations of security pol-
                icy.

       -i ino   Limits the report to only those files whose inode numbers follow.  May be given multiple times to select multiple inode numbers.

       If the filesystem is seriously corrupted, or very busy and looks like it is corrupt, a message of the  form  that  would  be  generated  by
       xfs_check(8) may appear.

       xfs_ncheck is only useful with XFS filesystems.

SEE ALSO

       mkfs.xfs(8), xfs_check(8), xfs(5).

                                                                                                                                     xfs_ncheck(8)
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