Re: kern/57475: Error message ffs_snapshot_mount: vget failed 2 after fsck

[Robert Elz <kre%munnari.OZ.AU@localhost>]

The following reply was made to PR kern/57475; it has been noted by GNATS.

From: Robert Elz <kre%munnari.OZ.AU@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/57475: Error message ffs_snapshot_mount: vget failed 2 after fsck
Date: Wed, 21 Jun 2023 03:10:39 +0700

     Date:        Tue, 20 Jun 2023 05:40:01 +0000 (UTC)
     From:        mp%petermann-it.de@localhost
     Message-ID:  <20230620054001.335621A9242%mollari.NetBSD.org@localhost>
 
 I cannot comment on the problem with the snapshot, nor with why
 what you're doing is causing a panic in the first place, but this
 one is easy:
 
   | - What can I do to get rid of the "unknown" .snap entry in the root
   |   directory of the FS without damaging the Filesystem?
 
 Nothing.
 
 It is already gone.   The fsdb entry:
 
 slot 4 off 56 ino 0 reclen 456: unknown, `.snap'
 
 is simply describing the free space at the end of the directory (that's
 what "ino 0" tells you, a free record), the reclen is also a hint, a
 directory entry for a filename that long would probably have a reclen
 of 16 (certainly >= 12 and <= 20, and a multiple of 4).   But instead
 it is the whole rest of the block (512 - 56) ... 56 is its offset.
 
 That the data field happens to contain ".snap" is irrelevant, that's
 just what was there last.    If you really want that string to go away,
 simply create "/data/foobar" (irrelevant what that is) and then delete
 it again, and the ".snap" in the empty (unused) space will be changed
 to "foobar".
 
 kre