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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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LN(1)							      General Commands Manual							     LN(1)

NAME
ln - make links SYNOPSIS
ln [ -s ] sourcename [ targetname ] ln [ -s ] sourcename1 sourcename2 [ sourcename3 ... ] targetdirectory DESCRIPTION
A link is a directory entry referring to a file; the same file (together with its size, all its protection information, etc.) may have several links to it. There are two kinds of links: hard links and symbolic links. By default ln makes hard links. A hard link to a file is indistinguishable from the original directory entry; any changes to a file are effective independent of the name used to reference the file. Hard links may not span file systems and may not refer to directories. The -s option causes ln to create symbolic links. A symbolic link contains the name of the file to which it is linked. The referenced file is used when an open(2) operation is performed on the link. A stat(2) on a symbolic link will return the linked-to file; an lstat(2) must be done to obtain information about the link. The readlink(2) call may be used to read the contents of a symbolic link. Symbolic links may span file systems and may refer to directories. Given one or two arguments, ln creates a link to an existing file sourcename. If targetname is given, the link has that name; targetname may also be a directory in which to place the link; otherwise it is placed in the current directory. If only the directory is specified, the link will be made to the last component of sourcename. Given more than two arguments, ln makes links in targetdirectory to all the named source files. The links made will have the same name as the files being linked to. SEE ALSO
rm(1), cp(1), mv(1), link(2), readlink(2), stat(2), symlink(2) 4th Berkeley Distribution April 10, 1986 LN(1)
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