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Full Discussion: Recreating a deleted hardlink to a file if I know the inode number
Special Forums Hardware Filesystems, Disks and Memory Recreating a deleted hardlink to a file if I know the inode number Post 302223686 by Perderabo on Monday 11th of August 2008 06:41:49 AM
Old 08-11-2008
I don't think that you're breaking the rules with a 2 week bump. Hard links are only possible within a file system. You can't can't make a hard link from one file system into another file system. /proc is a separate file system and you can't create links there at all. An extra link in /proc won't help you anyway. Forget /proc. It goes nowhere.

The only tool with a shot at this is fsdb, but I don't know fsdb well enough to tell you the precise steps. Call this plan A. The general steps I would try are:

1 create some file
2 create an extra link to the file with very bizarre name (more easily found and easy to sure you have the right one)
3 hit the power switch to drop power to the box
4 come up in single user mode and run fsdb
5 edit the directory entry to point to my file
6 edit the inodes to increment and decrement the usuage counts
7 run fsck

And I would practice on a test system before I tried it for real.

If I couldn't get it to work, plan B:

1 drop power
2 ship the disk to a data recovery specialist with experts who can implement plan A.
 

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LEARN ABOUT OPENSOLARIS

fsdb

fsdb(1M)						  System Administration Commands						  fsdb(1M)

NAME

       fsdb - file system debugger

SYNOPSIS

       fsdb [-F FSType] [-V] [-o FSType-specific_options] special

DESCRIPTION

       fsdb  is  a  file  system debugger that allows for the manual repair of a file system after a crash.   special is a special device  used to
       indicate the file system to be debugged. fsdb is intended for experienced users only. FSType is the file system type to be debugged.  Since
       different  FSTypes  have  different  structures	and  hence different debugging capabilities, the manual pages for the FSType-specific fsdb
       should be consulted for a more detailed description of the debugging capabilities.

OPTIONS

       -F    Specify the  FSType on which to operate.  The  FSType should either be specified here or be determinable from  /etc/vfstab by  match-
	     ing the  special with an entry in the table, or by consulting /etc/default/fs.

       -V    Echo the complete command line, but do not execute the command. The command line is generated by using the options and arguments pro-
	     vided by the user and adding to them information derived from  /etc/vfstab. This option may be used to verify and validate  the  com-
	     mand line.

       -o    Specify  FSType-specific options.

USAGE

       See largefile(5) for the description of the behavior of fsdb when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

FILES

       /etc/default/fs	  default  local  file	system	type.  Default	values can be set for the following flags in /etc/default/fs. For example:
			  LOCAL=ufs

			  LOCAL:    The default partition for a command if no FSType is specified.

       /etc/vfstab	  list of default parameters for each file system

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       vfstab(4), attributes(5), largefile(5) Manual pages for the FSType-specific modules of fsdb.

NOTES

       This command may not be supported for all FSTypes.

SunOS 5.11							    16 Sep 1996 							  fsdb(1M)
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