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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 302223619 by Smiling Dragon on Monday 11th of August 2008 01:44:29 AM
Old 08-11-2008
Recreating a deleted hardlink to a file if I know the inode number

At risk of twisting the rules to nearly the point of breaking (if you think this goes too far mods, I apologise and accept that this should be deleted), I'm hoping someone might be able to cast a little light on the following problem regarding hard links to files.

Creating a hardlink to a file
Quote:
I'm trying to relink a file someone tried to delete while a process (that we don't want to shutdown) also had a filehandle open to it.
Consequently, we've got an inode entry but no directory entry (aka 'file') for it.

I've tracked the inode number down via lsof, as well as the particular filehandle the process has within the /proc filesystem.

This filehandle is presented as a standard "file"/directory entry in /proc/<pid>/fd and I can read from it ok as I would any other file.

I was hoping to create a link to it back where it used to be but I keep getting a 'No such file or directory' error. I know I've got my ln syntax correct as I've tested it out on plain files elsewhere.
Code:
ln /proc/<pid>/fd/<handle> /path/to/application/logs/access

Is ln the tool to use here? Surely if I know the inode number, filehandle and what it used to be called, I can recreate it?
 

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clri(1M)																  clri(1M)

NAME
clri - clear inode SYNOPSIS
special i-number ... DESCRIPTION
The command clears the inode i-number by filling it with zeros. special must be a special file name referring to a device containing a file system. For proper results, special should not be mounted (see WARNINGS below). After is executed, all blocks in the affected file show up as "missing" in an of special (see fsck(1M)). This command should only be used in emergencies. Read and write permission is required on the specified special device. The inode becomes allocatable. WARNINGS
The primary purpose of this command is to remove a file that for some reason does not appear in any directory. If it is used to clear an inode that does appear in a directory, care should be taken to locate the entry and remove it. Otherwise, when the inode is reallocated to some new file, the old entry in the directory will still point to that file. At that point, removing the old entry destroys the new file, causing the new entry to point to an unallocated inode, so the whole cycle is likely to be repeated again. If the file system is mounted, is likely to be ineffective. DEPENDENCIES
operates only on file systems of type SEE ALSO
fsck(1M), fsdb(1M), ncheck(1M). STANDARDS CONFORMANCE
clri: SVID2, SVID3 clri(1M)
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